Reinforcing addition type liquid silicone rubber bonding accelerant and preparation method and application thereof

An adhesion promoter, liquid silicone rubber technology, applied in the direction of adhesives, adhesive additives, chemical instruments and methods, etc., can solve the problems of platinum catalyst poisoning, complicated preparation process, easy to generate gel, etc., and achieve the ability to resist external force Enhancement, simple preparation process, and the effect of improving mechanical properties

Inactive Publication Date: 2013-03-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are mainly three methods: one is to treat the surface of the substrate, including pretreating the surface of the substrate with a primer, and treating the surface of the substrate with plasma. The disadvantage is that additional production processes are required, which reduces production efficiency. Increased production costs; the second is to make the addition-type liquid silicone rubber itself adhesive by changing the molecular structure of polysiloxane, but because the preparation process is relatively complicated, the realization of industrial production and popularization and application is greatly limited; the third is By adding an adhesion promoter, the addition-type liquid silicone rubber can be cured to obtain adhesion
[0005] Chinese patent CN102408869A discloses a hydrolysis reaction with vinyl trimethyl (ethyl) oxysilane and γ-(2,3-epoxypropoxy) propyl trimethyl (ethyl) oxysilane or both hydrolysis reaction products and The addition-type liquid silicone rubber adhesion promoter prepared by the reaction of γ-aminopropyltrimethyl(ethyl)oxysilane has certain adhesion to aluminum, but the hydrolysis reaction conditions of siloxane are not easy to control, and the reaction process is easy Gel, and nitrogen-containing compounds are easy to poison the platinum catalyst and other disadvantages
Due to the non-crystalline structure of silicone rubber, its macromolecular chains are very flexible, and the interaction force between chains is weak. The strength of unreinforced silicone rubber is extremely low, and it is almost useless.

Method used

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  • Reinforcing addition type liquid silicone rubber bonding accelerant and preparation method and application thereof
  • Reinforcing addition type liquid silicone rubber bonding accelerant and preparation method and application thereof
  • Reinforcing addition type liquid silicone rubber bonding accelerant and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 12.82g of pentaerythritol triallyl ether (APE) and 11.82g of 3-(2,3-epoxypropoxy)propyltrimethoxysilane (KH-560) into a three-necked flask with a thermometer and a condensing reflux tube, Stir evenly at room temperature, then add 0.25 g of tetrabutyl titanate dropwise under stirring conditions, raise the temperature to 80° C. for 2 h, and finally continue the reaction for 2 h under a vacuum of 0.5 kPa to obtain the product adhesion promoter 1.

[0033] To the infrared spectrum of adhesion promoter 1 ( figure 1 ) for analysis at 2844cm -1 The absorption peak of methoxy group appears at 1646cm -1 The absorption peak of the double bond appears at 922cm -1 The C-H absorption peak in the alkenyl group and the absorption peak of the epoxy group appear at the place.

[0034] The H NMR spectrum of adhesion promoter 1 ( figure 2 ) analysis, the peak at the chemical shift 5-6ppm is produced by the hydrogen proton in the double bond, the peak at the chemical shift 3.54ppm...

Embodiment 2

[0039] Add 12.82g of APE and 18.02g of 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane (KH-567) into a three-necked flask with a thermometer and a condensing reflux tube, and stir evenly at room temperature , then added dropwise 0.15 g of tetrabutyl titanate under stirring conditions, raised the temperature to 130° C. for 1 h, and finally continued the reaction for 1 h under a vacuum of 0.01 kPa to obtain the product adhesion promoter 2.

[0040] Infrared spectrum and hydrogen nuclear magnetic spectrum analysis of adhesion promoter 2 shows that its structure is:

[0041]

[0042] 40 parts by mass of vinyl silicone oil with a viscosity of 300mPa·s, 60 parts by mass of vinyl silicone oil with a viscosity of 1000mPa·s, 120 parts by mass of alumina with an average particle size of 5μm, 2.5 parts by mass of adhesion promoter 2, and 6.33 parts by mass of One part of hydrogen-containing silicone oil with a hydrogen content of 0.5% and 0.004 parts by mass of 1-ethynyl-1-cyclohexanol ar...

Embodiment 3

[0044] The difference between this example and Example 1 is that KH-560 is changed to 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane (KH-566), and its dosage is 12.32g, Adhesion Promoter 3 was prepared.

[0045] The infrared spectrum and hydrogen nuclear magnetic spectrum analysis of the adhesion promoter 3 shows that its structure is:

[0046]

[0047] Change adhesion promoter 1 to adhesion promoter 3, and its consumption is 1.5 mass parts, and the consumption of corresponding hydrogen-containing silicone oil is reduced to 6.3 mass parts, the divinyltetramethyldisiloxane complex of chloroplatinic acid The amount of compound was changed to 1.52 parts by mass. The performance of cured sample is as shown in table 1, and its shear strength is 0.96MPa, and tensile strength is 3.01MPa, has improved respectively 182% and 35% with respect to the shear strength of comparative example 1 and tensile strength, shows that KH Adhesion promoter 3 prepared by -566 instead of KH-560 can si...

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Abstract

The invention discloses a reinforcing addition type liquid silicone rubber bonding accelerant and a preparation method and an application thereof. The bonding accelerant is a siloxane compound which contains polyalkenyl, epoxy groups and alkoxyl simultaneously. The preparation method comprises the steps of uniformly agitating a hydroxyl containing polyalkenyl ether compound and an epoxy siloxane compound at room temperature; adding a catalyst; heating to 60-130 DEG C to react for 1-10h; and then, continuously reacting for 1-6h at a reduced pressure. The bonding accelerant provided by the invention is simple and convenient in preparation process, low in cost of materials which are easy to get, green and environment-friendly and suitable for industrialized production. The bonding accelerant prepared by the method provided by the invention can remarkably improve the bonding performance of the liquid silicone rubber, is beneficial for fillers to be filled and dispersed in silicon rubber, improves the mechanical property of the silicon rubber, and has a wide application prospect in the fields of electronic apparatus packaging, semiconductor chip coating and photovoltaic module packaging and the like.

Description

technical field [0001] The invention relates to the technical field of silicone material bonding and reinforcement, in particular to an adhesion promoter that can improve the bonding and mechanical properties of addition-type liquid silicone rubber. The invention also relates to the preparation method and application of the adhesion promoter. Background technique [0002] In today's world, with the rapid development of science and technology, human beings have entered the age of electronic information. With the continuous advancement of electronic technology, electronic components and logic circuits are increasingly integrated, miniaturized and modularized, and the working environment is more harsh, which puts forward higher requirements for the stability of electronic devices. Packaging is one of the important processes of electronic components. It can strengthen the integrity of electronic components, prevent moisture, dust and harmful gases from corroding electronic comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J11/06C09J183/07C07F7/18
Inventor 曾幸荣潘科学胡新嵩林晓丹李红强赖学军黄俊鹏范志山
Owner SOUTH CHINA UNIV OF TECH
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