ADHESIVE COMPOSITION FOR OIL SILICONE RUBBER

Abstract

An adhesive composition for oil bleeding silicone rubber comprising any of: (A) an alcohol-based organic solvent solution adding 45 to 120 parts by weight of organometallic compound and 2 to 10 parts by weight of water, based on 100 parts by weight of vinyltrialkoxysilane, (B) a solution in which 5 parts by weight or less, preferably 1 to 5 parts by weight, of 3-aminopropyltrialkoxysilane is added to the above alcohol-based organic solvent solution (A), or (C) a solution in which uncrosslinked silicone rubber dissolved beforehand in an organic solvent is added to the above alcohol-based organic solvent solution (A) or (B) in which the amount of the organometallic compound is changed to 5 to 20 parts by weight, at a ratio of 0.1 to 5 wt. %, based on the total solid matters of vinyltrialkoxysilane and the organometallic compound. The adhesive composition has excellent adhesion to various substrates, including metals.

Claims

1: An adhesive composition for oil bleeding silicone rubber comprising an alcohol-based organic solvent solution adding 45 to 120 parts by weight of an organometallic compound and 2 to 10 parts by weight of water, based on 100 parts by weight of vinyltrialkoxysilane.

2: An adhesive composition for oil bleeding silicone rubber comprising an alcohol-based organic solvent solution adding 45 to 120 parts by weight of an organometallic compound, 5 parts by weight or less of 3-aminopropyltrialkoxysilane, and 2 to 10 parts by weight of water, based on 100 parts by weight of vinyltrialkoxysilane.

3: The adhesive composition for oil bleeding silicone rubber according to claim 2, wherein the amount of 3-aminopropyltrialkoxysilane is 1 to 5 parts by weight.

4: An adhesive composition for oil bleeding silicone rubber comprising a solution in which uncrosslinked silicone rubber dissolved beforehand in an organic solvent is added to an alcohol-based organic solvent solution adding 5 to 20 parts by weight of an organometallic compound, 2 to 10 parts by weight of water, and 0 to 5 parts by weight of 3-aminopropyltrialkoxysilane, based on 100 parts by weight of vinyltrialkoxysilane, at a ratio of 0.1 to 5 wt. %, based on the total solid matters of vinyltrialkoxysilane and the organometallic compound.

5: The adhesive composition for oil bleeding silicone rubber according to claim 1, wherein the organometallic compound is tetra-n-butyl titanate or a dimer thereof.

6: The adhesive composition for oil bleeding silicone rubber according to claim 1, wherein the oil bleeding silicone rubber is silicone oil-compounding silicone rubber.

7: The adhesive composition for oil bleeding silicone rubber according to claim 1, wherein the composition is aged under temperature conditions of 20 to 50° C. for 24 hours or more.

8: The adhesive composition for oil bleeding silicone rubber according to claim 4, wherein the organic solvent in which uncrosslinked silicone rubber is dissolved beforehand is an aromatic hydrocarbon solvent.

9: The adhesive composition for oil bleeding silicone rubber according to claim 1, wherein the composition is used for bonding between a metal, a thermoplastic resin, or a glass-epoxy resin prepreg, and oil bleeding silicone rubber.

10: An integrally molded product of a metal, a thermoplastic resin, or a glass-epoxy resin prepreg, and oil bleeding silicone rubber, which are bonded and integrated with each other using the adhesive composition for oil bleeding silicone rubber according to claim 1.

11: The adhesive composition for oil bleeding silicone rubber according to claim 2, wherein the organometallic compound is tetra-n-butyl titanate or a dimer thereof.

12: The adhesive composition for oil bleeding silicone rubber according to claim 4, wherein the organometallic compound is tetra-n-butyl titanate or a dimer thereof.

13: The adhesive composition for oil bleeding silicone rubber according to claim 2, wherein the oil bleeding silicone rubber is silicone oil-compounding silicone rubber.

14: The adhesive composition for oil bleeding silicone rubber according to claim 4, wherein the oil bleeding silicone rubber is silicone oil-compounding silicone rubber.

15: The adhesive composition for oil bleeding silicone rubber according to claim 2, wherein the composition is aged under temperature conditions of 20 to 50° C. for 24 hours or more.

16: The adhesive composition for oil bleeding silicone rubber according to claim 4, wherein the composition is aged under temperature conditions of 20 to 50° C. for 24 hours or more.

17: The adhesive composition for oil bleeding silicone rubber according to claim 2, wherein the composition is used for bonding between a metal, a thermoplastic resin, or a glass-epoxy resin prepreg, and oil bleeding silicone rubber.

18: The adhesive composition for oil bleeding silicone rubber according to claim 4, wherein the composition is used for bonding between a metal, a thermoplastic resin, or a glass-epoxy resin prepreg, and oil bleeding silicone rubber.

19: An integrally molded product of a metal, a thermoplastic resin, or a glass-epoxy resin prepreg, and oil bleeding silicone rubber, which are bonded and integrated with each other using the adhesive composition for oil bleeding silicone rubber according to claim 2.

20: An integrally molded product of a metal, a thermoplastic resin, or a glass-epoxy resin prepreg, and oil bleeding silicone rubber, which are bonded and integrated with each other using the adhesive composition for oil bleeding silicone rubber according to claim 4.

Description

EXAMPLES

[0025] The present invention will be described in detail below, referring to Examples.

Example 1

[0026]

TABLE-US-00001 Vinyltrimethoxysilane 100 parts by weight Tetra-n-butyl titanate 100 parts by weight n-butyl alcohol 790 parts by weight Pure water  8 parts by weight
A mixed solution of the above components was prepared, and aged at 40° C. for 48 hours, thereby obtaining an adhesive composition.

Example 2

[0027]

TABLE-US-00002 Vinyltriethoxysilane 100 parts by weight Tetra-n-butyl titanate dimer 100 parts by weight Isopropyl alcohol 790 parts by weight Pure water  8 parts by weight
A mixed solution of the above components was prepared, and aged at 40° C. for 48 hours, thereby obtaining an adhesive composition.

Example 3

[0028]

TABLE-US-00003 Vinyltrimethoxysilane 100 parts by weight Tetra-n-butyl titanate 100 parts by weight 3-aminopropyltriethoxysilane  2 parts by weight n-butyl alcohol 790 parts by weight Pure water  8 parts by weight
A mixed solution of the above components was prepared, and aged at 40° C. for 48 hours, thereby obtaining an adhesive composition.

Example 4

[0029]

TABLE-US-00004 Vinyltrimethoxysilane 100 parts by weight Tetra-n-butyl titanate  10 parts by weight Isopropyl alcohol 330 parts by weight Pure water  3 parts by weight
A mixed solution of the above components was prepared, and aged at 40° C. for 48 hours, thereby obtaining a liquid A.

[0030] Further, 1 part by weight of uncrosslinked silicone rubber (X-34-1897A, produced by Shin-Etsu Chemical Co., Ltd.) was dissolved in 99 parts by weight of toluene to obtain a liquid B. The liquids A and B were mixed at a weight ratio of 4:1, thereby obtaining an adhesive composition (0.23 wt. % of uncrosslinked silicone rubber, based on the total amount of vinyltrimethoxysilane and tetra-n-butyl titanate).

Example 5

[0031] In Example 4, an adhesive composition was obtained using Chemlok 600 (produced by Lord Far East Inc.; uncrosslinked silicone rubber concentration: 1.0 wt. %) as the liquid B.

Comparative Example 1

[0032] In Example 1, the amount of tetra-n-butyl titanate was changed to 40 parts by weight.

Comparative Example 2

[0033] In Example 1, the amount of tetra-n-butyl titanate was changed to 200 parts by weight.

Comparative Example 3

[0034] In Example 3, the amount of 3-aminopropyltriethoxysilane was changed to 10 parts by weight.

[0035] The adhesive compositions of Examples 1 to 3 and Comparative Examples 1 to 3 that were aged at 40° C. for 48 hours were observed. As a result, in Comparative Example 2, the molecular weight was overly increased, and the compounding components were thus deposited and precipitated, thereby failing to obtain an adhesive. 100 parts by weight of other adhesive compositions were each dissolved in 180 parts by weight of 2-butanone to prepare adhesive coating liquids. The resulting adhesive coating liquids were each applied to a SUS304 plate and a polybutylene terephthalate (PBT) plate, both of which had been degreased with an organic solvent. The applied adhesive coating liquids were dried by allowing them to stand under room temperature conditions for 5 minutes, followed by heat treatment at 100° C. for 10 minutes.

[0036] Moreover, 100 parts by weight of the adhesive compositions of Examples 4 and 5 were each dissolved in 900 parts by weight of toluene to prepare adhesive coating liquids, and the resulting adhesive coating liquids were subjected to the same procedure. However, the drying under room temperature conditions was changed to for 10 minutes, and the conditions of the heat treatment were changed to at 150° C. for 10 minutes.

[0037] An oil bleeding silicone rubber compound (DY-32-3067, produced by Dow Corning Toray Co., Ltd.) to which silicone oil was added was bonded to these adhesive-coated plates. Then, pressure crosslinking was performed at 180° C. for 4 minutes, followed by secondary crosslinking at 200° C. for 4 hours. The resulting bonded products were subjected to a 900 peeling test according to JIS K-6256 corresponding to ISO 23529, and the peel strength and the rubber remaining area ratio were measured.

[0038] <When 2 wt. % of Silicone Oil was Added>

TABLE-US-00005 TABLE 1 Ex. Comp. Ex. Measurement item 1 2 3 4 5 1 3 [SUS304] Peel strength (N/mm) 3.7 3.5 3.4 3.5 3.7 1.7 0.9 Rubber remaining 100 100 100 100 100 70 10 area ratio (%) [PBT] Peel strength (N/mm) 3.0 3.2 2.9 3.0 3.1 1.0 0.8 Rubber remaining 90 90 90 95 95 30 0 area ratio (%)

[0039] <When 10 wt. % of Silicone Oil was Added>

TABLE-US-00006 TABLE 2 Ex. Comp. Ex. Measurement item 1 2 3 4 5 1 3 [SUS304] Peel strength (N/mm) 1.9 1.5 1.6 3.3 3.2 0.2 0.1 Rubber remaining 40 50 50 100 100 0 0 area ratio (%) [PBT] Peel strength (N/mm) 1.2 1.2 1.0 2.9 3.0 0.1 0.1 Rubber remaining 40 30 40 90 95 0 0 area ratio (%)

[0040] Further, the adhesion (peel strength and rubber remaining area ratio) to a glass-epoxy resin prepreg (without surface polish treatment), which was a substrate material with poor wettability and difficulty in uniform coating of the adhesive, was measured.

[0041] The above-mentioned adhesive coating liquids of Examples 1 to 3, and Comparative Examples 1 and 3 were each applied to the prepreg degreased with an organic solvent. The applied adhesive coating solutions were dried under room temperature conditions for 10 minutes, followed by heat treatment at 120° C. for 10 minutes. Further, the above-mentioned adhesive coating liquids of Examples 4 and 5 were each applied to the prepreg degreased with an organic solvent. The applied adhesive coating liquids were dried under room temperature conditions for 10 minutes, followed by heat treatment at 150° C. for 10 minutes.

[0042] The above-mentioned oil bleeding silicone rubber compound to which 2 wt. % of silicone oil was added was bonded to these adhesive-coated plates, and curing was performed under the same conditions. Table 3 below shows the obtained results.

TABLE-US-00007 TABLE 3 Ex. Comp. Ex. Measurement item 1 2 3 4 5 1 3 [Prepreg] Peel strength (N/mm) 1.7 2.0 3.3 3.1 3.3 1.0 0.2 Rubber remaining 50 50 100 100 100 10 0 area ratio (%)