DEFOAMING COMPOSITION

Abstract

A defoaming composition is composed of a composition E composed of a hydrogen bond donor polyether modified polysiloxane C and a hydrogen bond acceptor X, and a composition F composed of a hydrogen bond donor fatty alcohol polyether D and a hydrogen bond acceptor Y; and the polyether modified polysiloxane C is composed of a polyorganosiloxane A and an allyl polyether B. The general structural formula of the polyorganosiloxane A is R.sup.0.sub.2HSiO (Me.sub.2SiO).sub.aSiHR.sup.0.sub.2, where R.sup.0 is C1-12 alkyl, cycloalkyl or aryl, and a=10-100. The general structural formula of the allyl polyether B is CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.b(OCH.sub.2CHCH.sub.3).sub.cOH, where b=1-10, and c=10-100. The general structural formula of the fatty alcohol polyether D is R.sup.1(OCH.sub.2CH.sub.2).sub.m(OCH.sub.2CHCH.sub.3).sub.nOH, where R.sup.1 is C3-20 linear or branched alkyl, cycloalkyl or aralkyl; m=1-50; and n=10-100. The hydrogen bond acceptors X and Y are menthol, menthene, thymol, terpilenol, carveol or perillyl alcohol.

Claims

1. A defoaming composition, comprising a first composition and a second composition, wherein the first composition comprises a first hydrogen bond donor and a first hydrogen bond acceptor, wherein the first hydrogen bond donor is a polyether modified polysiloxane; the second composition comprises a second hydrogen bond donor and a second hydrogen bond acceptor, wherein the second hydrogen bond donor is a fatty alcohol polyether; the polyether modified polysiloxane comprises a polyorganosiloxane and an allyl polyether; a general structural formula of the polyorganosiloxane is:
R.sup.0.sub.2HSiO(Me.sub.2SiO).sub.aSiHR.sup.0.sub.2, wherein R.sup.0 is alkyl, cycloalkyl or aryl with 1-12 carbon atoms, and a is an integer between 10 and 100; a general structural formula of the allyl polyether is:
CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.b(OCH.sub.2CHCH.sub.3).sub.cOH, wherein b is an integer between 1 and 10, and c is an integer between 10 and 100; a general structural formula of the fatty alcohol polyether is:
R.sup.1(OCH.sub.2CH.sub.2).sub.m(OCH.sub.2CHCH.sub.3).sub.nOH, wherein R.sup.1 is linear or branched alkyl, cycloalkyl or aralkyl with 3-20 carbon atoms; m is an integer between 1 and 50; and n is an integer between 10 and 100; the first hydrogen bond acceptor and the second hydrogen bond acceptor are both selected from the group consisting of menthol, menthene, thymol, terpilenol, carveol and perillyl alcohol.

2. The defoaming composition of claim 1, wherein the polyorganosiloxane is terminal hydrogen-containing polyorganosiloxane.

3. The defoaming composition of claim 1, wherein when the R.sup.0 in the polyorganosiloxane is alkyl, the R.sup.0 is selected from the group consisting of methyl, ethyl, n-propyl, n-butyl, isobutyl, n-amyl, n-hexyl, n-heptyl, n-octyl, isooctyl, n-nonyl, n-decyl, and n-dodecyl.

4. The defoaming composition of claim 1, wherein when the R.sup.0 in the polyorganosiloxane is cycloalkyl, the R.sup.0 is cyclopentyl or cyclohexyl ethyl.

5. The defoaming composition of claim 1, wherein when the R.sup.0 in the polyorganosiloxane is aryl, the R.sup.0 is phenyl, phenylmethyl, phenylethyl, or 2-phenylpropyl.

6. The defoaming composition of claim 1, wherein the polyorganosiloxane accounts for 10-32% of a total mass of the defoaming composition; the allyl polyether accounts for 5-18% of the total mass of the defoaming composition; the fatty alcohol polyether accounts for 50-83% of the total mass of the defoaming composition; the first hydrogen bond acceptor accounts for 0.5-5% of the total mass of the defoaming composition; and the second hydrogen bond acceptor accounts for 0.5-5% of the total mass of the defoaming composition.

7. The defoaming composition of claim 1, wherein the defoaming composition further comprises a catalyst, wherein the catalyst is selected from the group consisting of a platinum-alcohol complex, a platinum-alkene complex, a platinum-alkoxide complex, a platinum-ether complex, a platinum-ketone complex, an isopropyl alcohol chloroplatinate solution and a platinum-vinyl complex; and an amount of platinum in the catalyst is 3-20 ppm of a total mass of the polyorganosiloxane and the allyl polyether.

8. The defoaming composition of claim 7, wherein the catalyst is the isopropyl alcohol chloroplatinate solution.

9. A method of preparing a waterborne wood paint, comprising the step of using the defoaming composition of claim 1 as a defoaming aid in a form of an internal additive in the waterborne wood paint.

10. A preparation method of the defoaming composition of claim 1, comprising: 1) putting a first reaction mixture of the polyorganosiloxane, the allyl polyether, and a catalyst into a first reaction vessel, heating the first reaction mixture to 60-140° C., and stirring, and preserving heat for 0.5-1.5 h to obtain the polyether modified polysiloxane; 2) mixing the polyether modified polysiloxane and the first hydrogen bond acceptor into a second reaction mixture, and putting the second reaction mixture into a second reaction vessel, stirring the second reaction mixture at 25° C.-100° C., and preserving heat until the second reaction mixture is transparent and clear to obtain the first composition; 3) mixing the fatty alcohol polyether and the second hydrogen bond acceptor into a third reaction mixture and putting the third reaction into a third reaction vessel, stirring the third reaction mixture at 25° C.-100° C., and preserving heat until the third reaction mixture is transparent and clear to obtain the second composition; and 4) mixing the first composition and the second composition, and stirring well, to obtain the defoaming composition.

11. The defoaming composition of claim 2, wherein when the R.sup.0 in the polyorganosiloxane is alkyl, the R.sup.0 is selected from the group consisting of methyl, ethyl, n-propyl, n-butyl, isobutyl, n-amyl, n-hexyl, n-heptyl, n-octyl, isooctyl, n-nonyl, n-decyl, and n-dodecyl.

12. The defoaming composition of claim 3, wherein the R.sup.0 is methyl.

13. The defoaming composition of claim 11, wherein the R.sup.0 is methyl.

14. The defoaming composition of claim 2, wherein when the R.sup.0 in the polyorganosiloxane is cycloalkyl, the R.sup.0 is cyclopentyl or cyclohexyl ethyl.

15. The defoaming composition of claim 2, wherein when the R.sup.0 in the polyorganosiloxane is aryl, the R.sup.0 is phenyl, phenylmethyl, phenylethyl, or 2-phenylpropyl.

16. The defoaming composition of claim 6, wherein the defoaming composition further comprises a catalyst, wherein the catalyst is selected from the group consisting of a platinum-alcohol complex, a platinum-alkene complex, a platinum-alkoxide complex, a platinum-ether complex, a platinum-ketone complex, an isopropyl alcohol chloroplatinate solution and a platinum-vinyl complex; and an amount of platinum in the catalyst is 3-20 ppm of a total mass of the polyorganosiloxane and the allyl polyether.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG. 1 is a shrink hole rating standard in a high-speed dispersion test experiment; and

[0033] FIG. 2 shows the test results of high-speed dispersion and coating performance in an embodiment.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The present invention is further described below with reference to the accompanying drawings and specific implementations.

[0035] Embodiment 1: 16 g of terminal hydrogen-containing polyorganosiloxane Me.sub.2HSiO(Me.sub.2SiO).sub.55SiHMe.sub.2, 11 g of allyl polyether CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.5(OCH.sub.2CHCH.sub.3).sub.55OH and 10 ppm of an isopropyl alcohol chloroplatinate solution (based on platinum) were put into a reaction vessel, heated to 110° C. and stirred, and the heat was preserved for 1.0 h, to obtain polyether modified polysiloxane C1; the polyether modified polysiloxane C1 and 3 g of menthol were mixed and put into a reaction vessel and stirred at 60° C., and the heat was preserved until the system is transparent and clear, to obtain a composition E1; 67 g of fatty alcohol polyether C12H25(OCH.sub.2CH.sub.2).sub.25(OCH.sub.2CHCH.sub.3).sub.55OH and 3 g of menthol were mixed and put into a reaction vessel and stirred at 60° C., and the heat was preserved until the system is transparent and clear, marked as a composition F1; and the composition E1 and the composition F1 were mixed and stirred well to obtain a defoaming composition M1.

[0036] Embodiment 2: 32 g of terminal hydrogen-containing polyorganosiloxane Me.sub.2HSiO(Me.sub.2SiO).sub.100SiffMe.sub.2, 8 g of allyl polyether CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.1(OCH.sub.2CHCH.sub.3).sub.10OH and 20 ppm of an isopropyl alcohol chloroplatinate solution (based on platinum) were put into a reaction vessel, heated to 60° C. and stirred, and the heat was preserved for 1.5 h, to obtain polyether modified polysiloxane C2; the polyether modified polysiloxane C2 and 5 g of thymol were mixed and put into a reaction vessel and stirred at 100° C., and the heat was preserved until the system is transparent and clear, to obtain a composition E2; 50 g of fatty alcohol polyether C.sub.20H.sub.41(OCH.sub.2CH.sub.2).sub.50(OCH.sub.2CHCH.sub.3).sub.100OH and 5 g of terpilenol were mixed and put into a reaction vessel and stirred at 100° C., and the heat was preserved until the system is transparent and clear, marked as a composition F2; and the composition E2 and the composition F2 were mixed and stirred well to obtain a defoaming composition M2.

[0037] Embodiment 3: 10 g of terminal hydrogen-containing polyorganosiloxane Me.sub.2HSiO(Me.sub.2SiO).sub.10SiHMe.sub.2, 18 g of allyl polyether CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.10(OCH.sub.2CHCH.sub.3).sub.100OH and 3 ppm of an isopropyl alcohol chloroplatinate solution (based on platinum) were put into a reaction vessel, heated to 140° C. and stirred, and the heat was preserved for 1.0 h, to obtain polyether modified polysiloxane C3; the polyether modified polysiloxane C3 and 0.5 g of menthene were mixed and put into a reaction vessel and stirred at room temperature, and the heat was preserved until the system is transparent and clear, to obtain a composition E3; 71 g of fatty alcohol polyether C.sub.3H.sub.7(OCH.sub.2CH.sub.2)(OCH.sub.2CHCH.sub.3).sub.10OH and 0.5 g of carveol were mixed and put into a reaction vessel and stirred at 25° C., and the heat was preserved until the system is transparent and clear, marked as a composition F3; and the composition E3 and the composition F3 were mixed and stirred well to obtain a defoaming composition M3.

[0038] Embodiment 4: 10 g of terminal hydrogen-containing polyorganosiloxane Me.sub.2HSiO(Me.sub.2SiO).sub.68SiHMe.sub.2, 5 g of allyl polyether CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.6(OCH.sub.2CHCH.sub.3).sub.60OH and 7 ppm of an isopropyl alcohol chloroplatinate solution (based on platinum) were put into a reaction vessel, heated to 120° C. and stirred, and the heat was preserved for 0.5 h, to obtain polyether modified polysiloxane C4; the polyether modified polysiloxane C4 and 1 g of menthene were mixed and put into a reaction vessel and stirred at 50° C., and the heat was preserved until the system is transparent and clear, to obtain a composition E4; 83 g of fatty alcohol polyether C.sub.8H.sub.15(OCH.sub.2CH.sub.2).sub.30(OCH.sub.2CHCH.sub.3).sub.70OH and 1 g of perillyl alcohol were mixed and put into a reaction vessel and stirred at 50° C., and the heat was preserved until the system is transparent and clear, marked as a composition F4; and the composition E4 and the composition F4 were mixed and stirred well to obtain a defoaming composition M4.

[0039] Embodiment 5: 12 g of terminal hydrogen-containing polyorganosiloxane Me.sub.2HSiO(Me.sub.2SiO).sub.40SiHMe.sub.2, 12 g of allyl polyether CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.4(OCH.sub.2CHCH.sub.3).sub.50OH and 12 ppm of an isopropyl alcohol chloroplatinate solution (based on platinum) were put into a reaction vessel, heated to 100° C. and stirred, and the heat was preserved for 0.5 h, to obtain polyether modified polysiloxane C5; the polyether modified polysiloxane C5 and 2 g of thymol were mixed and put into a reaction vessel and stirred at 70° C., and the heat was preserved until the system is transparent and clear, to obtain a composition E5; 70 g of fatty alcohol polyether C.sub.6H.sub.13(OCH.sub.2CH.sub.2).sub.25(OCH.sub.2CHCH.sub.3).sub.55OH and 4 g of menthene were mixed and put into a reaction vessel and stirred at 40° C., and the heat was preserved until the system is transparent and clear, marked as a composition F5; and the composition E5 and the composition F5 were mixed and stirred well to obtain a defoaming composition M5.

[0040] Embodiment 6: 20 g of terminal hydrogen-containing polyorganosiloxane Me.sub.2HSiO(Me.sub.2SiO).sub.80SiHMe.sub.2, 10 g of allyl polyether CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.5(OCH.sub.2CHCH.sub.3).sub.70OH and 9 ppm of an isopropyl alcohol chloroplatinate solution (based on platinum) were put into a reaction vessel, heated to 90° C. and stirred, and the heat was preserved for 0.5 h, to obtain polyether modified polysiloxane C6; the polyether modified polysiloxane C6 and 4 g of perillyl alcohol were mixed and put into a reaction vessel and stirred at 80° C., and the heat was preserved until the system is transparent and clear, to obtain a composition E6; 62 g of fatty alcohol polyether C.sub.14H.sub.29(OCH.sub.2CH.sub.2).sub.20(OCH.sub.2CHCH.sub.3).sub.60OH and 4 g of menthene were mixed and put into a reaction vessel and stirred at 40° C., and the heat was preserved until the system is transparent and clear, marked as a composition F6; and the composition E6 and the composition F6 were mixed and stirred well to obtain a defoaming composition M6.

[0041] Embodiment 7: 26 g of terminal hydrogen-containing polyorganosiloxane Me.sub.2HSiO(Me.sub.2SiO).sub.40SiHMe.sub.2, 16 g of allyl polyether CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.8(OCH.sub.2CHCH.sub.3).sub.30OH and 16 ppm of an isopropyl alcohol chloroplatinate solution (based on platinum) were put into a reaction vessel, heated to 130° C. and stirred, and the heat was preserved for 0.5 h, to obtain polyether modified polysiloxane C7; the polyether modified polysiloxane C7 and 2 g of terpilenol were mixed and put into a reaction vessel and stirred at 40° C., and the heat was preserved until the system is transparent and clear, to obtain a composition E7; 55 g of fatty alcohol polyether C6H13(OCH.sub.2CH.sub.2).sub.40(OCH.sub.2CHCH.sub.3).sub.80OH and 1 g of thymol were mixed and put into a reaction vessel and stirred at 40° C., and the heat was preserved until the system is transparent and clear, marked as a composition F7; and the composition E7 and the composition F7 were mixed and stirred well to obtain a defoaming composition M7.

Comparative Example 1

[0042] 27 g of fatty alcohol polyether C.sub.12H.sub.25(OCH.sub.2CH.sub.2).sub.25(OCH.sub.2CHCH.sub.3).sub.55OH and 3 g of menthol were mixed and put into a reaction vessel and stirred at 60° C., and the heat was preserved until the system is transparent and clear, to obtain a composition E8; 67 g of fatty alcohol polyether C.sub.12H.sub.25(OCH.sub.2CH.sub.2).sub.25(OCH.sub.2CHCH.sub.3).sub.55OH and 3 g of menthol were mixed and put into a reaction vessel and stirred at 60° C., and the heat was preserved until the system is transparent and clear, marked as a composition F1; and the composition E8 and the composition F1 were mixed and stirred well to obtain a defoaming composition N1.

Comparative Example 2

[0043] 32 g of terminal hydrogen-containing polyorganosiloxane Me.sub.2HSiO(Me.sub.2SiO).sub.100SiHMe.sub.2, 8 g of allyl polyether CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.1(OCH.sub.2CHCH.sub.3).sub.10OH and 20 ppm of an isopropyl alcohol chloroplatinate solution (based on platinum) were put into a reaction vessel, heated to 60° C. and stirred, and the heat was preserved for 1.5 h, to obtain polyether modified polysiloxane C2; the polyether modified polysiloxane C2 and 5 g of thymol were mixed and put into a reaction vessel and stirred at 100° C., and the heat was preserved until the system is transparent and clear, to obtain a composition E2; 50 g of the polyether modified polysiloxane C2 and 5 g of terpilenol were mixed and put into a reaction vessel and stirred at 100° C., and the heat was preserved until the system is transparent and clear, marked as a composition F8; and the composition E2 and the composition F8 were mixed and stirred well to obtain a defoaming composition N2.

Comparative Example 3

[0044] 95 g of fatty alcohol polyether C.sub.3H.sub.7(OCH.sub.2CH.sub.2)(OCH.sub.2CHCH.sub.3).sub.10OH and 5 g of carveol were mixed and put into a reaction vessel and stirred at 25° C., and the heat was preserved until the system is transparent and clear, to obtain a defoaming composition N3.

Comparative Example 4

[0045] 53 g of terminal hydrogen-containing polyorganosiloxane Me.sub.2HSiO(Me.sub.2SiO).sub.68SiHMe.sub.2, 37 g of allyl polyether CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.6(OCH.sub.2CHCH.sub.3).sub.60OH and 7 ppm of an isopropyl alcohol chloroplatinate solution (based on platinum) were put into a reaction vessel, heated to 120° C. and stirred, and the heat was preserved for 0.5 h, to obtain polyether modified polysiloxane C8; the polyether modified polysiloxane C8 and 10 g of menthene were mixed and put into a reaction vessel and stirred at 50° C., and the heat was preserved until the system is transparent and clear, to obtain a defoaming composition N4.

Comparative Example 5

[0046] 12 g of terminal hydrogen-containing polyorganosiloxane Me.sub.2HSiO(Me.sub.2SiO).sub.40SiHMe.sub.2, 12 g of allyl polyether CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.4(OCH.sub.2CHCH.sub.3).sub.55OH and 12 ppm of an isopropyl alcohol chloroplatinate solution (based on platinum) were put into a reaction vessel, heated to 100° C. and stirred, and the heat was preserved for 0.5 h, to obtain polyether modified polysiloxane C5; the polyether modified polysiloxane C5 and 76 g of fatty alcohol polyether C.sub.6H.sub.13(OCH.sub.2CH.sub.2).sub.25(OCH.sub.2CHCH.sub.3).sub.55OH were mixed and put into a reaction vessel and stirred well at 40° C., to obtain a defoaming composition N5.

Comparative Example 6

[0047] 26 g of terminal hydrogen-containing polyorganosiloxane Me.sub.2HSiO(Me.sub.2SiO).sub.40SiHMe.sub.2, 16 g of allyl polyether CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.8(OCH.sub.2CHCH.sub.3).sub.30OH and 16 ppm of an isopropyl alcohol chloroplatinate solution (based on platinum) were put into a reaction vessel, heated to 130° C. and stirred, and the heat was preserved for 0.5 h, to obtain polyether modified polysiloxane C7; the polyether modified polysiloxane C7 and 2 g of CH.sub.3—CO—NH—CH.sub.3 were mixed and put into a reaction vessel and stirred at 40° C., and the heat was preserved until the system is transparent and clear, to obtain a composition E9; 55 g of fatty alcohol polyether C.sub.6H.sub.13(OCH.sub.2CH.sub.2).sub.40(OCH.sub.2CHCH.sub.3).sub.80OH and 1 g of CH.sub.3—CO—NH—CH.sub.3 were mixed and put into a reaction vessel and stirred at 40° C., and the heat was preserved until the system is transparent and clear, marked as a composition F9; and the composition E9 and the composition F9 were mixed well, to obtain a defoaming composition N6.

Comparative Example 7

[0048] 16 g of terminal hydrogen-containing polyorganosiloxane Me.sub.2HSiO(Me.sub.2SiO).sub.55SiHMe.sub.2, 11 g of allyl polyether CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.5(OCH.sub.2CHCH.sub.3).sub.55OH and 10 ppm of an isopropyl alcohol chloroplatinate solution (based on platinum) were put into a reaction vessel, heated to 110° C. and stirred, and the heat was preserved for 1.0 h, to obtain polyether modified polysiloxane C1; the polyether modified polysiloxane C1 and 3 g of choline chloride were mixed and put into a reaction vessel and stirred at 60° C., and the heat was preserved until the system is transparent and clear, to obtain a composition E10; 67 g of fatty alcohol polyether C.sub.12H.sub.25(OCH.sub.2CH.sub.2).sub.25(OCH.sub.2CHCH.sub.3).sub.55OH and 3 g of menthol were mixed and put into a reaction vessel and stirred at 60° C., and the heat was preserved until the system is transparent and clear, marked as a composition F1; and the composition E10 and the composition F1 were mixed and stirred well, to obtain a defoaming composition N7.

Comparative Example 8

[0049] 16 g of terminal hydrogen-containing polyorganosiloxane Me.sub.2HSiO(Me.sub.2SiO).sub.55SiHMe.sub.2, 11 g of allyl polyether CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.5(OCH.sub.2CHCH.sub.3).sub.55OH and 10 ppm of an isopropyl alcohol chloroplatinate solution (based on platinum) were put into a reaction vessel, heated to 110° C. and stirred, and the heat was preserved for 1.0 h, to obtain polyether modified polysiloxane C1; the polyether modified polysiloxane C1 and 3 g of menthol were mixed and put into a reaction vessel and stirred at 60° C., and the heat was preserved until the system is transparent and clear, to obtain a composition E1; 67 g of fatty alcohol polyether C12H25(OCH.sub.2CH.sub.2).sub.25(OCH.sub.2CHCH.sub.3).sub.55OH and 3 g of choline chloride were mixed and put into a reaction vessel and stirred at 60° C., and the heat was preserved until the system is transparent and clear, to obtain a composition F10; and the composition E1 and the composition F10 were mixed and stirred well, to obtain a defoaming composition N8.

Comparative Example 9

[0050] A defoamer N9 was prepared according to Embodiment 1 in the patent CN106693450A.

Comparative Example 10

[0051] A defoamer N10 was prepared according to Embodiment 1 in the patent CN106752267A.

[0052] Performance Test on Defoamer Composition

[0053] (1) High-speed dispersion test: a test was carried out by using waterborne wood paint as a foaming medium and adopting a high-speed dispersion method: 100 g of waterborne wood paint was weighed with a cleaned stainless-steel cup, and 0.3 g of a defoamer was added. The mixture was subjected to high-speed dispersion for 5 min at a speed of 1,000 rpm, and then immediately poured into a 100 ml graduated cylinder; the weight and volume of the waterborne wood paint were recorded; and a specific gravity was calculated. A greater value of the specific gravity indicates a lower air content and a better defoaming and foam-inhibiting performance of the defoamer.

[0054] (2) Judgment of coating performance: the waterborne wood paint after the high-speed dispersion was put aside for 15 min; a certain amount of the waterborne wood paint was taken out from the bottom and allowed to stand on a clean glass plate, and scraped flat by a wet film preparation device; and the status (shrink hole conditions) of the waterborne wood paint on the glass plate was observed. The results are judged as FIGS. 1 and 2; and fewer shrink holes indicate better compatibility.

[0055] (3) Gloss test on the paint film: the coated glass plate was subjected to a gloss test using a 60° gloss meter; measurement was carried out at three different positions of the glass plate; and the result was recorded as the arithmetic mean of the readings at the three points while the surface conditions of the paint film were observed. A higher gloss value indicates a paint film with a better fullness.

[0056] It should be noted that, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any combination or equivalent replacement based on the above embodiments shall be included in the protection scope of the present invention.