Low-Viscosity Silane-Terminated Resin for Sealant and Preparation Method Thereof

Abstract

The present application discloses a low-viscosity silane-terminated resin for a sealant and a preparation method thereof, and belongs to the technical field of sealants. The present application firstly uses an alcohol initiator, an alkaline earth metal and epoxy alkane to synthesize a low-molecular-weight polymer, then adds a polymetallic cyanide catalyst and the epoxy alkane to synthesize a high-molecular-weight polymer, and finally adds carboxylate metal and isocyanate silane to react to obtain the silane-terminated resin. A short chain segment is successfully introduced into a molecule, and an original molecular crystal is destroyed, to achieve intramolecular plasticization, so that its molecular chain becomes flexible and is easy to move, thus the purpose of reducing viscosity is achieved.

Claims

1. A preparation method for a low-viscosity silane-terminated resin for a sealant, comprising the following steps: S1, adding 1 part of alcohol initiator and alkaline earth metal to a reaction kettle, raising the temperature to 75?150? C. after nitrogen replacement, adding 7.5?14.5 parts of epoxy alkane, controlling the pressure to be 0.0?0.4 Mpa, curing until the pressure is no longer decreased, cooling, degassing, and refining, to obtain a low-molecular-weight polymer; S2, adding 1 part of the low-molecular-weight polymer prepared in the Step S1 and 5-15 ppm of a polymetallic cyanide catalyst by total mass to the reaction kettle, raising the temperature to 120?130? C. after the nitrogen replacement, dehydrating, then raising the temperature to 130?140? C., adding 250?355 parts of the epoxy alkane, controlling the pressure to be 0.0?0.4 Mpa, curing until the pressure is no longer decreased, cooling, degassing, and discharging, to obtain a high-molecular-weight polymer resin; and S3, adding carboxylate metal and isocyanate silane to the high-molecular-weight polymer resin prepared in the Step S2 for a reaction, during the reaction, taking a reaction mixture for an infrared characteristic peak test, and ending the reaction when there is no longer an isocyanate infrared characteristic peak in the reaction mixture, to obtain the silane-terminated resin; the structural formula of the silane-terminated resin is as follows: ##STR00005## wherein, being a repeated unit of ##STR00006## and the number of the repeated units being ?172; R being C.sub.nH.sub.2n, n=1?5; R.sub.1 being a straight chain alkyl C.sub.mH.sub.2m+1, m?1, and the mass ratio of R.sub.1 as a methyl in the repeated unit being 50?90%; R.sub.2 being CH.sub.3 or CH.sub.2CH.sub.3; and R.sub.3 being OR.sub.2 or R.sub.2.

2. The preparation method for the low-viscosity silane-terminated resin for the sealant according to claim 1, wherein the number average molecular weight of the silane-terminated resin is about 15000-30000.

3. The preparation method for the low-viscosity silane-terminated resin for the sealant according to claim 1, wherein the alcohol initiator in the Step S1 is one of propylene glycol, isobutylene glycol, or D-1,3-butanediol; the alkaline earth metal is K or Na; the epoxy alkanes in the Steps S1 and S2 are a mixture of epoxy propane and one of epoxy butane, epoxy hexane, epoxy pentane, and epoxy heptane.

4. The preparation method for the low-viscosity silane-terminated resin for the sealant according to claim 3, wherein the mixing molar ratio of the epoxy propane to other epoxy alkanes in the epoxy alkane mixture is 1:1?10:1.

5. The preparation method for the low-viscosity silane-terminated resin for the sealant according to claim 1, wherein the number average molecular weight of the low-molecular-weight polymer prepared in the Step S1 is 400-800.

6. The preparation method for the low-viscosity silane-terminated resin for the sealant according to claim 1, wherein metal ions contained in the polymetallic cyanide catalyst in the Step S2 are at least two of Co, Zn, and Pb.

7. The preparation method for the low-viscosity silane-terminated resin for the sealant according to claim 1, wherein the dehydration time in the Step S2 is 30-90 min, the curing temperature is 130?150? C., and it is degassed and discharged after being cooled to 90?110? C.

8. The preparation method for the low-viscosity silane-terminated resin for the sealant according to claim 1, wherein the addition amount of the carboxylate metal in the Step S3 is 0.05?0.15% of the total feeding amount; the carboxylate metal is an organic tin carboxylate catalyst, an organic bismuth carboxylate catalyst, an organic cobalt carboxylate catalyst, or an organic zinc carboxylate catalyst; and the mass ratio of the hydroxyl value of the high-molecular-weight polymer resin to NCO of the isocyanate silane in the Step S3 is OH:NCO=0.98?1.02:1.

9. The preparation method for the low-viscosity silane-terminated resin for the sealant according to claim 1, wherein the reaction temperature in the Step S3 is 40?100? C., and the reaction time is 2?10 h.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the application, and constitute a part of the application, and the exemplary embodiments of the application and the description thereof are intended to explain the application and do not constitute an undue limitation on the application.

[0029] FIG. 1 is a preparation method for a low-viscosity silane-terminated resin for the sealant.

[0030] FIG. 2 is a preparation method for a low-viscosity silane-terminated resin for a sealant provided by Embodiment 1.

[0031] FIG. 3 is a preparation method for a low-viscosity silane-terminated resin for a sealant provided by Embodiment 2.

[0032] FIG. 4 is a preparation method for a low-viscosity silane-terminated resin for a sealant provided by Embodiment 3.

[0033] FIG. 5 is a preparation method for a low-viscosity silane-terminated resin for a sealant provided by Embodiment 4.

[0034] FIG. 6 is a preparation method for a low-viscosity silane-terminated resin for a sealant provided by Contrast example 1.

[0035] FIG. 7 is a preparation method for a low-viscosity silane-terminated resin for a sealant provided by Embodiment 5.

[0036] FIG. 8 is a preparation method for a low-viscosity silane-terminated resin for a sealant provided by Embodiment 9.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The present application is further described in detail below in combination with specific implementation modes.

[0038] A low-viscosity silane-terminated resin for a sealant, its number average molecular weight is approximately 15000-30000, and its structural formula is as follows.

##STR00003##

[0039] Herein, is a repeated unit of

##STR00004##

and the number of the repeated units is ?172;

[0040] R is C.sub.nH.sub.2n, n=1?5; R.sub.1 is a straight chain alkyl C.sub.mH.sub.2m+1, m?1, and the mass ratio of R.sub.1 as a methyl in the repeated unit is 50?90%; R.sub.2 is CH.sub.3 or CH.sub.2CH.sub.3; and R.sub.3 is OR.sub.2 or R.sub.2.

[0041] As shown in FIG. 1, a preparation method for the above low-viscosity silane-terminated resin for the sealant, and it includes the following steps.

[0042] S10, 1 part of alcohol initiator and alkaline earth metal is added to a reaction kettle, the temperature is raised to 75?150? C. after nitrogen replacement for three or more times, 7.5?14.5 parts of epoxy alkane are added, the pressure is controlled to be 0.0?0.4 Mpa, it is cured until the pressure is no longer decreased, the temperature is reduced to 90?115? C., and it is degassed, and refined, to obtain a low-molecular-weight polymer with a number average molecular weight of 400-800.

[0043] S20, 1 part of the low-molecular-weight polymer prepared in the Step S10 and 5-15 ppm of a polymetallic cyanide catalyst by total mass are added to the reaction kettle, the temperature is raised to 120?130? C. after the nitrogen replacement for three times, it is dehydrated for 30-90 min, then the temperature is raised to 130?140? C., 250?355 parts of the epoxy alkane (10?30 g of the epoxy alkane is firstly added, the pressure is controlled to be 0.2?0.9 Mpa, and the remaining epoxy alkane is added after the pressure is decreased significantly) are added, the pressure is controlled to be 0.0?0.4 Mpa, it is cured at a temperature of 130?150? C. until the pressure is no longer decreased, the temperature is reduced to 90?110? C., and it is degassed, and discharged, to obtain a high-molecular-weight polymer resin with a number average molecular weight of 15000?30000.

[0044] S30, carboxylate metal which is 0.05?0.15% of the total feeding amount and isocyanate silane (OH:NCO=0.98?1.02:1) are added to the high-molecular-weight polymer resin prepared in the Step S20 and it is reacted at a temperature of 40?100? C. for 2?10 h, during the reaction, a reaction mixture is taken for an infrared characteristic peak test, and the reaction is ended when there is no longer an isocyanate infrared characteristic peak in the reaction mixture, to obtain the silane-terminated resin.

[0045] In the above method, the alcohol initiator in the Step S1 is one of propylene glycol, isobutylene glycol, or D-1,3-butanediol; the alkaline earth metal is K or Na; the epoxy alkanes in the Steps S1 and S2 are a mixture of epoxy propane and one of epoxy butane, epoxy hexane, epoxy pentane, and epoxy heptane; metal ions contained in the polymetallic cyanide catalyst in the Step S2 are at least two of Co, Zn, and Pb; and the carboxylate metal is an organic tin carboxylate catalyst, an organic bismuth carboxylate catalyst, an organic cobalt carboxylate catalyst, or an organic zinc carboxylate catalyst, such as dibutyltin dilaurate, stannous octoate, or other carboxylate metal catalysts.

EMBODIMENT 1

[0046] As shown in FIG. 2, a preparation method for a low-viscosity silane-terminated resin for a sealant, and it includes the following steps.

[0047] S11, 100 g of propylene glycol and Na which is 0.2% of the total feeding amount by mass fraction are added to a reaction kettle, the temperature is raised to 100?5? C. after nitrogen replacement for three times, 952 g of epoxy alkane composed of epoxy propane and epoxy butane mixed in a mass ratio of 9:1 is added, the pressure is controlled to be less than 0.4 Mpa, after being added, it is cured until the pressure is no longer decreased, the temperature is reduced to 90? C., and it is degassed and refined, to obtain a low-molecular-weight polymer with a number average molecular weight of 796.

[0048] S12, 100 g of the low-molecular-weight polymer prepared in the Step S11 and a polymetallic cyanide catalyst which is 0.002% of the total feeding amount by mass fraction are added to the reaction kettle, the temperature is raised to 125?5? C. after the nitrogen replacement for three times, it is dehydrated for 40 min, then the temperature is raised to 130?140? C., 2135 g of the epoxy alkane (10?30 g of the epoxy alkane is firstly added, the pressure is controlled to be less than 0.9 Mpa, and the remaining epoxy alkane is added after the pressure is decreased significantly) composed of epoxy propane and epoxy butane mixed in a mass ratio of 9:1 is added, the pressure is controlled to be less than 0.4 Mpa, it is cured at a temperature of 140?5? C. until the pressure remains unchanged for 20 min, the temperature is reduced to 110? C.?5? C., and it is degassed, and discharged, to obtain a high-molecular-weight polymer resin with a number average molecular weight of about 15638.

[0049] S13, dibutyltin dilaurate which is 0.1% of the total feeding amount and 3-isocyanate propyl trimethoxysilane (OH:NCO=0.98:1) are added to the high-molecular-weight polymer resin prepared in the Step S12 and it is reacted at a temperature of 100? C. for 3 h, during the reaction, a reaction mixture is taken for an infrared characteristic peak test, and the reaction is ended when there is no longer an isocyanate infrared characteristic peak in the reaction mixture, to obtain the silane-terminated resin.

EMBODIMENT 2

[0050] As shown in FIG. 3, a preparation method for a low-viscosity silane-terminated resin for a sealant, and it includes the following steps.

[0051] S21, 100 g of propylene glycol and Na which is 0.2% of the total feeding amount by mass fraction are added to a reaction kettle, the temperature is raised to 100?5? C. after nitrogen replacement for three times, 952 g of epoxy alkane composed of epoxy propane and epoxy pentane mixed in a mass ratio of 9:1 is added, the pressure is controlled to be less than 0.4 Mpa, after being added, it is cured until the pressure is no longer decreased, and it is cooled, degassed, and refined, to obtain a low-molecular-weight polymer with a number average molecular weight of about 780.

[0052] S22, 100 g of the low-molecular-weight polymer prepared in the Step S21 and a polymetallic cyanide catalyst which is 0.002% of the total feeding amount by mass fraction are added to the reaction kettle, the temperature is raised to 120?5? C. after the nitrogen replacement for three times, it is dehydrated for 40 min, then the temperature is raised to 130?140? C., 2229 g of the epoxy alkane (10?30 g of the epoxy alkane is firstly added, the pressure is controlled to be less than 0.6 Mpa, and the remaining epoxy alkane is added after the pressure is decreased significantly) composed of epoxy propane and epoxy pentane mixed in a mass ratio of 9:1 is added, the pressure is controlled to be less than 0.4 Mpa, it is cured at a temperature of 130?5? C. until the pressure remains unchanged for 20 min, the temperature is reduced to 110? C.?5? C., and it is degassed, and discharged, to obtain a high-molecular-weight polymer resin with a number average molecular weight of about 15486.

[0053] S23, dibutyltin dilaurate which is 0.1% of the total feeding amount and 3-isocyanate propyl trimethoxysilane (OH:NCO=0.98:1) are added to the high-molecular-weight polymer resin prepared in the Step S22 and it is reacted at a temperature of 100? C. for 5 h, during the reaction, a reaction mixture is taken for an infrared characteristic peak test, and the reaction is ended when there is no longer an isocyanate infrared characteristic peak in the reaction mixture, to obtain the silane-terminated resin.

EMBODIMENT 3

[0054] As shown in FIG. 4, a preparation method for a low-viscosity silane-terminated resin for a sealant, and it includes the following steps.

[0055] S31, 100 g of propylene glycol and Na which is 0.2% of the total feeding amount by mass fraction are added to a reaction kettle, the temperature is raised to 100?5? C. after nitrogen replacement for three times, 1052 g of epoxy alkane composed of epoxy propane and epoxy hexane mixed in a mass ratio of 9:1 is added, the pressure is controlled to be less than 0.4 Mpa, after being added, it is cured until the pressure is no longer decreased, and it is cooled, degassed, and refined, to obtain a low-molecular-weight polymer with a number average molecular weight of 785.

[0056] S32, 100 g of the low-molecular-weight polymer prepared in the Step S31 and a polymetallic cyanide catalyst which is 0.002% of the total feeding amount by mass fraction are added to the reaction kettle, the temperature is raised to 120?130? C. after the nitrogen replacement for three times, it is dehydrated for 40 min, then the temperature is raised to 130?140? C., 2216 g of the epoxy alkane (10?30 g of the epoxy alkane is firstly added, the pressure is controlled to be less than 0.6 Mpa, and the remaining epoxy alkane is added after the pressure is decreased significantly) composed of epoxy propane and epoxy hexane mixed in a mass ratio of 9:1 is added, the pressure is controlled to be less than 0.4 Mpa, it is cured at a temperature of 145?5? C. until the pressure remains unchanged for 20 min, the temperature is reduced to 110?5? C., and it is degassed, and discharged, to obtain a high-molecular-weight polymer resin with a number average molecular weight of 15758.

[0057] S33, dibutyltin dilaurate which is 0.10% of the total feeding amount and 3-isocyanate propyl trimethoxysilane (OH:NCO=0.98:1) are added to the high-molecular-weight polymer resin prepared in the Step S32 and it is reacted at a temperature of 100? C. for 5 h, during the reaction, a reaction mixture is taken for an infrared characteristic peak test, and the reaction is ended when there is no longer an isocyanate infrared characteristic peak in the reaction mixture, to obtain the silane-terminated resin.

EMBODIMENT 4

[0058] As shown in FIG. 5, a preparation method for a low-viscosity silane-terminated resin for a sealant, and it includes the following steps.

[0059] S41, 100 g of propylene glycol and Na which is 0.2% of the total feeding amount by mass fraction are added to a reaction kettle, the temperature is raised to 100?5? C. after nitrogen replacement for three times, 952 g of epoxy alkane composed of epoxy propane and epoxy heptane mixed in a mass ratio of 9:1 is added, the pressure is controlled to be less than 0.4 Mpa, after being added, it is cured until the pressure is no longer decreased, and it is cooled, degassed, and refined, to obtain a low-molecular-weight polymer with a number average molecular weight of 805.

[0060] S42, 100 g of the low-molecular-weight polymer prepared in the Step S41 and a polymetallic cyanide catalyst which is 0.002% of the total feeding amount by mass fraction are added to the reaction kettle, the temperature is raised to 120?130? C. after the nitrogen replacement for three times, it is dehydrated for 40 min, then the temperature is raised to 130?140? C., 2162 g of the epoxy alkane (10?30 g of the epoxy alkane is firstly added, the pressure is controlled to be less than 0.6 Mpa, and the remaining epoxy alkane is added after the pressure is decreased significantly) composed of epoxy propane and epoxy heptane mixed in a mass ratio of 9:1 is added, the pressure is controlled to be less than 0.4 Mpa, it is cured at a temperature of 140?5? C. until the pressure remains unchanged for 20 min, the temperature is reduced to 105?5? C., and it is degassed, and discharged, to obtain a high-molecular-weight polymer resin with a number average molecular weight of 15907.

[0061] S43, dibutyltin dilaurate which is 0.1% of the total feeding amount and 3-isocyanate propyl trimethoxysilane (OH:NCO=0.98:1) are added to the high-molecular-weight polymer resin prepared in the Step S42 and it is reacted at a temperature of 100? C. for 6 h, during the reaction, a reaction mixture is taken for an infrared characteristic peak test, and the reaction is ended when there is no longer an isocyanate infrared characteristic peak in the reaction mixture, to obtain the silane-terminated resin.

Contrast Example 1

[0062] As shown in FIG. 6, a preparation method for a silane-terminated resin, and it includes the following steps:

[0063] S100, 100 g of propylene glycol and Na which is 0.2% of the total feeding amount by mass fraction are added to a reaction kettle, the temperature is raised to 100?5? C. after nitrogen replacement for three times, 1052 g of epoxy propane is added, the pressure is controlled to be less than 0.4 Mpa, after being added, it is cured until the pressure is no longer decreased, and it is cooled, degassed, and refined, to obtain a low-molecular-weight polymer with a number average molecular weight of 790.

[0064] S200, 100 g of the low-molecular-weight polymer prepared in the Step S100 and a polymetallic cyanide catalyst which is 0.002% of the total feeding amount by mass fraction are added to the reaction kettle, the temperature is raised to 125?5? C. after the nitrogen replacement for three times, it is dehydrated for 40 min, then the temperature is raised to 130?140? C., 2178 g of the epoxy propane (10?30 g of the epoxy propane is firstly added, the pressure is controlled to be less than 0.6 Mpa, and the remaining epoxy propane is added after the pressure is decreased significantly) is added, the pressure is controlled to be less than 0.4 Mpa, it is cured at a temperature of 145?5? C. until the pressure remains unchanged for 20 min, the temperature is reduced to 110?5? C., and it is degassed, and discharged, to obtain a high-molecular-weight polymer resin with a number average molecular weight of 15796.

[0065] S300, dibutyltin dilaurate which is 0.10% of the total feeding amount and 3-isocyanate propyl trimethoxysilane (OH:NCO=0.98:1) are added to the high-molecular-weight polymer resin prepared in the Step S200 and it is reacted at a temperature of 100? C. for 5 h, during the reaction, a reaction mixture is taken for an infrared characteristic peak test, and the reaction is ended when there is no longer an isocyanate infrared characteristic peak in the reaction mixture, to obtain the silane-terminated resin.

[0066] Liquid phase analysis is performed on the products obtained from Embodiments 1?4 and Contrast example 1, and results are shown in Table 1:

TABLE-US-00001 TABLE 1 Liquid phase analysis results of products obtained from Embodiments 1~4 and Contrast example 1 Dynamic viscosity (mpa .Math. s, Item Mn Mw D Mp 25? C.) Embodiment 1 15638 17019 1.088 15732 28000 Embodiment 2 15486 16818 1.086 15151 26600 Embodiment 3 15758 17145 1.088 15340 23500 Embodiment 4 15907 17280 1.086 15467 23100 Contrast 15796 17170 1.087 15464 32600 example 1

[0067] From Table 1, it may be seen that the main chain of Contrast example 1 is a polyoxypropylene ether chain, and the dynamic viscosity is 32600 mpa.Math.s at 25? C., which is far higher than the dynamic viscosities of Embodiments 1?4. It is indicated that the alkyl chain of R1 added to the chain segment in the present application is longer, and the viscosity of the product is lower, which shows the molecular chain segment becomes flexible, and is easy to move.

EMBODIMENT 5

[0068] As shown in FIG. 7, a preparation method for a low-viscosity silane-terminated resin for a sealant, and it includes the following steps.

[0069] S51, 100 g of isobutylene glycol and Na which is 0.3% of the total feeding amount by mass fraction are added to a reaction kettle, the temperature is raised to 100?5? C. after nitrogen replacement for three times, 345 g of an epoxy alkane mixture composed of epoxy propane and epoxy pentane mixed in a certain mass ratio is added, the pressure is controlled to be less than 0.4 Mpa, after being added, it is cured until the pressure is no longer decreased, and it is cooled, degassed, and refined, to obtain a low-molecular-weight polymer with a number average molecular weight of about 400.

[0070] S52, 100 g of the low-molecular-weight polymer prepared in the Step S51 and a polymetallic cyanide catalyst which is 0.005% of the total feeding amount by mass fraction are added to the reaction kettle, the temperature is raised to 120?130? C. after the nitrogen replacement for three times, it is dehydrated for 40 min, then the temperature is raised to 130?140? C., 3680 g of the epoxy alkane mixture (10?30 g of the epoxy alkane is firstly added, the pressure is controlled to be less than 0.6 Mpa, and the remaining epoxy alkane is added after the pressure is decreased significantly) composed of epoxy propane and epoxy pentane mixed in a mass ratio of 5:1 is added, the pressure is controlled to be less than 0.4 Mpa, it is cured at a temperature of 145?5? C. until the pressure remains unchanged for 20 min, the temperature is reduced to 110?5? C., and it is degassed, and discharged, to obtain a high-molecular-weight polymer resin with a number average molecular weight of about 15000.

[0071] S53, dibutyltin dilaurate which is 0.1% of the total feeding amount and 3-isocyanate propyl trimethoxysilane (OH:NCO=1:1) are added to the high-molecular-weight polymer resin prepared in the Step S52 and it is reacted at a temperature of 100? C. for 3 h, during the reaction, a reaction mixture is taken for an infrared characteristic peak test, and the reaction is ended when there is no longer an isocyanate infrared characteristic peak in the reaction mixture, to obtain the silane-terminated resin.

EMBODIMENT 6

[0072] The difference between this embodiment and Embodiment 5 is only that: 3680 g of an epoxy alkane mixture composed of epoxy propane and epoxy pentane mixed in a mass ratio of 6:1 is added.

EMBODIMENT 7

[0073] The difference between this embodiment and Embodiment 5 is only that: 3680 g of an epoxy alkane mixture composed of epoxy propane and epoxy pentane mixed in a mass ratio of 7:1 is added.

EMBODIMENT 8

[0074] The difference between this embodiment and Embodiment 5 is only that: 3680 g of an epoxy alkane mixture composed of epoxy propane and epoxy pentane mixed in a mass ratio of 8:1 is added.

Contrast Example 2

[0075] The difference between this contrast example and Embodiment 5 is only that: 3680 g of epoxy propane is added.

[0076] Liquid phase analysis is performed on the products obtained from Embodiments 5?8 and Contrast example 2, and results are shown in Table 2:

TABLE-US-00002 TABLE 2 Liquid phase analysis results of products prepared under different mixing ratios of epoxy propane and epoxy pentane Epoxy propane:epoxy Dynamic viscosity Item pentane Mn Mw D Mp (mpa .Math. s, 25? C.) Embodiment 5 5:1 14438 15810 1.101 14132 19650 Embodiment 6 6:1 14686 16038 1.092 14367 20600 Embodiment 7 7:1 14788 16089 1.088 14458 22500 Embodiment 8 8:1 14887 16168 1.086 14571 25100 Contrast example 2 10:0 15096 16395 1.086 14725 28600

[0077] From Table 2, it may be seen that the viscosity of the product is decreased with the increase of the flexible chain segment. When the ratio of the epoxy propane to the epoxy pentane is 5:1, the viscosity of the product is not decreased much. This is because: as the epoxy pentane is increased, the addition becomes difficult, and the molecular distribution coefficient reaches 1.101. The molecular distribution is widened, so that the resin viscosity is increased.

EMBODIMENT 9

[0078] As shown in FIG. 8, a preparation method for a low-viscosity silane-terminated resin for a sealant, and it includes the following steps.

[0079] S91, 100 g of isobutylene glycol and Na which is 0.25% of the total feeding amount by mass fraction are added to a reaction kettle, the temperature is raised to 100?5? C. after nitrogen replacement for three times, 345 g of an epoxy alkane mixture composed of epoxy propane and epoxy pentane mixed in a mass ratio of 7:1 is added, the pressure is controlled to be less than 0.4 Mpa, after being added, it is cured until the pressure is no longer decreased, and it is cooled, degassed, and refined, to obtain a low-molecular-weight polymer with a number average molecular weight of about 403.

[0080] S92, 100 g of the low-molecular-weight polymer prepared in the Step S91 and a polymetallic cyanide catalyst which is 0.005% of the total feeding amount by mass fraction are added to the reaction kettle, the temperature is raised to 120?130? C. after the nitrogen replacement for three times, it is dehydrated for 40 min, then the temperature is raised to 130?140? C., 3680 g of the epoxy alkane mixture (10?30 g of the epoxy alkane is firstly added, the pressure is controlled to be less than 0.6 Mpa, and the remaining epoxy alkane is added after the pressure is decreased significantly) composed of epoxy propane and epoxy pentane mixed in the mass ratio of 7:1 is added, the pressure is controlled to be less than 0.4 Mpa, it is cured at a temperature of 145?5? C. until the pressure remains unchanged for 20 min, the temperature is reduced to 110?5? C., and it is degassed, and discharged, to obtain a high-molecular-weight polymer resin with a number average molecular weight of about 14683.

[0081] S93, a different catalyst which is 0.05% of the total feeding amount and 3-isocyanate propyl trimethoxysilane (OH:NCO=1:1) are added to the high-molecular-weight polymer resin prepared in the Step S92 and it is reacted at a temperature of 60? C. for 3 h, during the reaction, a reaction mixture is taken for an infrared characteristic peak test, and the reaction is ended when there is no longer an isocyanate infrared characteristic peak in the reaction mixture, to obtain the silane-terminated resin.

TABLE-US-00003 TABLE 3 Liquid phase analysis results of products prepared with different catalyst types in S3 stage Dynamic viscosity S3 stage (mpa .Math. s, 25? C.) reaction Item Catalyst reaction time Embodiment Organic tin 23600 2.0 9.1 Embodiment Organic bismuth 21600 5.0 9.2 Embodiment Organic zinc 22300 6.0 9.3 Embodiment Composite 24100 2.5 9.4 organic bismuth and tin Embodiment Composite 21600 3.5 9.5 organic bismuth and zinc

[0082] From Table 3, it may be seen that the viscosity of the product is based on the same high-molecular polymer resin prepared in S1and S2, and in S3, the viscosity difference between the different catalysts used for silane terminating is relatively small. However, due to the different catalytic efficiencies of the different metal catalysts, the reaction times may be different, and the different catalysts may be selected according to different operating conditions.

Application Embodiment 1

[0083] The silane-terminated resins obtained from Embodiments 1?4 and Contrast example 1, Embodiments 5?8 and Contrast example 2 are respectively applied to a sealant, and the sealant is prepared by using the same method. The formula of the sealant consists of the following components calculated by mass percentage:

TABLE-US-00004 Silane-terminated resin 18% Filler 50.2% Plasticizer 25% Thixotropic agent 1.2% Stabilizer 0.6% Silane additive 4.5% Catalyst 0.5%

[0084] In the above formula, the filler is a mixture of nano-calcium carbonate and ground calcium carbonate in a mass ratio of 2:1; the plasticizer is diisononyl phthalate (DINP); the thixotropic agent is a polyamide wax; the stabilizer is a mixture of antioxidant 1076 and light stabilizer in a mass ratio of 1:1, and the light stabilizer is a light stabilizer commonly used on the market; the silane additive is a mixture of vinyl trimethoxysilane (the amount is 2%) and KH792 (the amount is 2.5%); and the catalyst is dibutylene dilaurate.

[0085] The extrudability, tensile property, tear strength and other properties of the obtained sealant are measured, and results are shown in Tables 3 and 4.

TABLE-US-00005 TABLE 3 Property data of sealants prepared by using silane-terminated resins in Embodiments 1~4 and Contrast example 1 Test Embodiment Embodiment Embodiment Embodiment Contrast Test item Test condition parameter Unit 1 2 3 4 example 1 Extrudability 23? C. 50% Humidity 0.35 MPa g/15 s 267 325 368 402 132 Hardness Room temperature Shore A hardness 40 39 39 38 41 Curing for 7 days Tensile Room temperature Tensile MPa 2.88 2.51 2.42 2.21 2.90 property Curing for 7 days strength 50% elongation 0.56 0.58 0.62 0.65 0.53 Transient stress Elongation % 795 696 864 962 520 at break Tear Room temperature kN/m 17.1 17.9 18.2 18.6 15.6 strength Curing for 7 days Bonding Room temperature Aluminum sheet AFb CF CF CF CF CF property Curing for 7 days Glass sheet CFc CF CF CF CF CF Peeling test Polyamide CF CF CF CF CF pieces plastic

[0086] From Table 3, it may be seen that the extrudability of Embodiments 1?4 is significantly increased compared to Contrast example 1, it is indicated that the flowability of the silane-terminated resin products prepared in Embodiments 1?4 is increased in the application process, and the elongation and tear strength are both increased. It is indicated that the internal flexibility of the silane-terminated resin molecule is increased, and the tensile strength is increased in the application process, thereby the bonding mechanical property of the silane-terminated resin is improved in the application process.

TABLE-US-00006 TABLE 4 Property data of sealants prepared by using silane-terminated resins in Embodiments 5~8 and Contrast example 2 Test Embodiment Embodiment Embodiment Embodiment Contrast Test item Test condition parameter Unit 5 6 7 8 example 2 Extrudability 23? C., 50% Humidity 0.35 MPa g/15 s 510 498 425 405 302 Hardness Room temperature Shore A hardness 45 44 44 42 45 Curing for 7 days Tensile Room temperature Tensile MPa 0.78 0.77 0.70 0.67 0.60 property Curing for 7 days strength Elongation % 575 568 410 398 308 at break Tear Room temperature kN/m 19.8 19.6 18.2 18.0 14.8 strength Curing for 7 days Bonding Room temperature Aluminum AFb CF CF CF CF CF property Curing for 7 days sheet CFc Peeling Glass sheet CF CF CF CF CF test pieces Polyamide CF CF CF CF CF plastic

[0087] From Table 4, it may be seen that the extrudability of the silane-terminated resins in Embodiments 5?8 is improved with the increase of epoxy pentane amount. The extrudability of the silane-terminated resin prepared by using the pure epoxy propane in Contrast example 2 is only 302 g/15 s, the breaking strength is 0.60 MPa, the elongation is decreased to 308%, and the tear strength is 14.8 kN/m, which is significantly lower than the silane-terminated resin with the high branching degree in the polyether segment of Embodiments 5?8.

[0088] The above implementation modes are only preferred implementation modes of the present application, and may not be used to limit the scope of protection of the present application. Any non-substantive changes and replacements made by those skilled in the art based on the present application belong to the scope of protection claimed by the present application.