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High-adhesion silicone sealant

A technology of silicone sealant and polysiloxane, which is applied in the direction of adhesives, other chemical processes, chemical instruments and methods, and can solve problems such as poor adhesion and scratch resistance

Active Publication Date: 2013-07-31
广东欧利雅化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] This invention solves the problem of poor adhesion and scratch resistance when polysiloxane is coated on a hard coating substrate with a hydrophobic surface, and discloses that only organic groups with mercapto groups are bonded to In the case of the combination of the main chain of polysiloxane, the solution to realize the technical effect of the invention

Method used

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  • High-adhesion silicone sealant
  • High-adhesion silicone sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Embodiment 1 (comparison)

[0117] Put 100 parts of α, ω-dihydroxy polydimethylsiloxane (weight average molecular weight 90,000) and 20 parts of fumed silica into the planetary mixer, vacuumize, vacuum degree 0.09MPa, and stir for 60 minutes at a speed of 25-60rpm ; Add 5 parts of methyl tributyl ketoxime silane, 2 parts of γ-chloropropyl triethoxysilane, 2 parts of trimethyl polydimethylsiloxane, 0.6 part of dibutyltin dilaurate, 2 parts of white oil Parts, the chemical reaction is carried out at a vacuum of 0.09MPa and a rotation speed of 25-60rpm, and the reaction time is 1 hour. Through the adhesion test method, the adhesion was broken and failed; the shear strength τ was 0.85MPa.

Embodiment 2

[0118] Embodiment 2 (comparison)

[0119] Put 100 parts of α, ω-dimercapto polydimethylsiloxane (number average molecular weight 4600) and 20 parts of gas phase silica into the planetary mixer, vacuumize, vacuum degree 0.09MPa, and stir for 60 minutes at a speed of 25-60rpm ; Add 5 parts of methyl tributyl ketoxime silane, 2 parts of γ-chloropropyl triethoxysilane, 2 parts of trimethyl polydimethylsiloxane, 0.6 part of dibutyltin dilaurate, 2 parts of white oil Parts, the chemical reaction is carried out at a vacuum of 0.09MPa and a rotation speed of 25-60rpm, and the reaction time is 1 hour. Through the adhesion test method, the adhesion was broken and failed; the shear strength τ was 0.87MPa.

Embodiment 3

[0120] Embodiment 3 (comparison)

[0121] 90 parts of α, ω-dihydroxypolydimethylsiloxane (weight average molecular weight 90,000), hydroxyl-terminated mercaptopolysiloxane (viscosity measured at 25°C is 50,000mPa.s, weight average molecular weight 81,000) 10 parts, 20 parts of fumed silica were added to the planetary mixer, vacuumed, the vacuum degree was 0.09MPa, and the rotation speed was 25-60rpm and stirred for 60 minutes; 2 parts of oxysilane, 2 parts of trimethylpolydimethylsiloxane, 0.6 part of dibutyltin dilaurate, 2 parts of white oil, carry out the chemical reaction at a vacuum degree of 0.09MPa and a speed of 25-60rpm, and the reaction time is 1 Hour. Through the adhesion test method, the adhesion was broken and failed; the shear strength τ was 0.90MPa.

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Abstract

The invention relates to a novel single-component room-temperature vulcanized silicone sealant material and belongs to the field of chemical materials. The traditional silicone sealant is mainly made of hydroxyl-terminated polysiloxane. During silicone sealant synthesis, a sulfur-containing group is introduced to a main chain of the hydroxyl-terminated polysiloxane. The hydroxyl-terminated polysiloxane is used with mercapto polysiloxane, and accordingly adhesion of the silicone sealant, especially adhesion with base materials such as metals and glass, is improved evidently. The process of thenovel single-component room-temperature vulcanized silicone sealant material is important to industrial production of silicone adhesive.

Description

technical field [0001] The invention relates to a novel one-component high-adhesive silicone sealant, which belongs to the field of chemical materials. Background technique [0002] Silicone sealant is a kind of sealing material made of hydroxyl-terminated polysiloxane, which belongs to polymer chemical products. The polymer main chain of silicone sealant is mainly composed of silicon-oxygen-silicon bonds. During the curing process, the crosslinking agent reacts with the base polymer to form a network Si-O-Si skeleton structure, and the organic compound composed of other polymers Compared with sealant, it has stronger adhesive force, higher tensile strength, and at the same time has the characteristics of UV resistance, vibration resistance, moisture resistance, odor resistance, high and low temperature resistance, and weather resistance. The sealant does not contain organic solvents and does not pollute the environment. After curing, the volume shrinkage of the colloid is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/08C09J183/06C09K3/10
Inventor 许萌芳
Owner 广东欧利雅化工有限公司