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Fluoropolyether adhesive composition

a technology of fluoropolyether and adhesive composition, which is applied in the direction of polyether adhesives, non-macromolecular adhesive additives, adhesive types, etc., can solve the problems of reducing affecting the adhesion strength and durability, etc., to achieve good resistance to solvents and heat, and low moisture permeability

Inactive Publication Date: 2005-09-15
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] A purpose of the present invention is to provide an adhesive composition which has no quality variation from lot to lot; can be cured by heating for a short period of time to adhere strongly to substrates of various kinds of materials such as metals and plastics; and gives a cured product having good resistance to solvents and heat, low moisture permeability and durability.
[0017] The present composition comprises the specific alkoxysilane of the formula (1) above to thereby be free from the aforesaid problem caused by moisture adsorbed on silica powder. The composition adheres well to various kinds of materials such as metals and plastics. An adhesive layer formed by heating the composition at a relatively low temperature for a short period of time has excellent resistance to solvents, heat, low moisture permeability and durability. The composition is useful for sealing and coating electric or electrical parts in the industries where stable quality and long-term reliability are required.

Problems solved by technology

However, the adhesive composition comprising the silica powder has a drawback.
Further, the higher the adsorbed moisture content is, the lower the adhesion strength and durability tend to be.
This variation in properties is detrimental in the automobile industry where quality stability of automobile parts is crucial.

Method used

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  • Fluoropolyether adhesive composition
  • Fluoropolyether adhesive composition
  • Fluoropolyether adhesive composition

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0096] In a planetary mixer, 100 parts of the linear polyfluoro compound of the following formula (11) having a viscosity of 10,000 mPa.s, a number average molecular weight of 17,000 and a vinyl group content of 0.012 mole / 100 g were placed, to which 2.0 parts of alkoxysilane of the following formula (12). Then, 25 parts of fumed silica was added in five batches in 2 hours while kneading without heating, which silica had been surface treated with dimethyldichlorosilane and had a BET specific surface area of 110 m2 / g and a moisture content of 0.3 wt %. Then, the planetary mixer was heated while mixing so that a temperature of the content of the mixer rose to 150 degrees C. The content was kept at a temperature of from 150 degrees C. to 170 degrees C. for further 2 hours under a reduced pressure of −0.008 MPa gage. Then, the content was cooled below a temperature of 40 degrees C., to which 25 parts of the linear polyfluoro compound of the formula (11) was added and mixed for another 1...

example 2

[0105] The procedures in Example 1 were repeated, except that 25 parts of fused silica surface-treated with dimethyldichlorosilane having a BET specific surface of 110 m2 / g and a moisture content of 0.4 wt % was used in place of the fused silica used in Example 1 and 2.5 parts of alkoxysilane of the following formula (17) was used in place of the alkoxysilane of the formula (12) used in Example 1.

(CH3O)3SiCH(CH3)COOC2H5  (17)

example 3

[0106] The procedures in Example 1 were repeated, except that 25 parts of fused silica surface-treated with hexamethyldisilazane having a BET specific surface of 120 m2 / g and a moisture content of 0.2 wt % was used in place of the fused silica used in Example 1 and 1.5 parts of alkoxysilane of the following formula (18) was used in place of the alkoxysilane of the formula (12) used in Example 1.

(CH3O)3SiCH(CH3)COOC8H17—n  (18)

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Abstract

An adhesive composition comprising the following components: (A) a linear polyfluoro compound having at least two SiH bonds per molecule and a perfluoropolyether residue in a main chain of the linear polyfluoro compound (A); (B) an organohydrogensiloxane having a fluorinated group and at least two hydrogen atoms each bonded to a silicon atom per molecule; (C) a compound of a platinum group metal; (D) hydrophobic silica powder; (E) an alkoxysilane represented by the following formula (1) (RO)3—Si—T  (1) wherein R is a monovalent hydrocarbon group, T is a group represented by the formula, —OR1 or —CHR2—COOR3, wherein R1 is a monovalent hydrocarbon group, which may be the same with or different from R, R2 is a hydrogen atom or a methyl group and R3 is a monovalent hydrocarbon group; and (F) an organosiloxane having at least one SiH bond and at least one group selected from the group consisting of an epoxy group and a trialkoxysilyl group. The composition has no quality variation from lot to lot and gives gives a cured product having good resistance to solvents and heat, and durability.

Description

CROSS REFERENCES [0001] This application claims benefits of Japanese Patent Applications No. 2004-063206 filed on Mar. 5, 2004, and No.2005-51162 filed on Feb. 25, 2005, the contents of which are hereby incorporated by reference. FIELD OF THE INVENTION [0002] The present invention relates to an adhesive composition which is self-adhesive to various kinds of substrates such as metals and plastics. The composition, when cured, gives a fluorinated elastomer adhering strongly to a substrate with excellent long-term durability. DESCRIPTION OF THE PRIOR ART [0003] A curable composition is known which forms a fluorinated elastomer by addition reaction between alkenyl groups and hydrosilyl groups contained in the composition. Japanese Patent Application Laid-Open No.9-95615 discloses a composition which comprises, in addition to the aforesaid curable composition, an organopolysiloxane having hydrosilyl groups and epoxy groups and / or trialkoxysilyl groups to thereby have a self-adherence pro...

Claims

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Application Information

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IPC IPC(8): C08G65/00C08G65/336C08K5/541C09J171/00C08K5/5419C08L71/02C08L83/08C09J11/04C09J171/02C09J183/02C09J183/04C09J183/05C09J183/08
CPCC08G65/007C08G65/336C09J183/08C09J171/02C08L83/08C08L71/02C08K5/5419C08K5/541C08L83/00C08L2666/14
Inventor SHIONO, MIKIO
Owner SHIN ETSU CHEM IND CO LTD