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Preparation of a silicone sealant modified by α-570 coupling agent

A silicone and sealant technology, applied in the direction of adhesives, adhesive additives, polymer adhesive additives, etc., can solve the problems of electronic components that cannot withstand such a high height, can only reach 0.4mm, and take a long time to fully cure. Achieve interface improvement effect, high activity, and shorten curing time

Active Publication Date: 2020-08-11
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Two-component silicone rubber will cause performance differences due to the influence of mixing ratio and mixing uniformity during use.
The condensation type one-component silicone rubber has the problem of long curing time because it is cured by water vapor.
[0004] Chinese patent CN10048261C discloses a one-component room temperature rapid vulcanization dealcoholized silicone structural sealant and its manufacturing method, which can be vulcanized rapidly at room temperature, but its vulcanized thickness can only reach 0.4mm after 24 hours. US Patent US4481341 Disclosed a platinum catalyst for heat-curing organosilane compositions. The organosilicon composition using this catalyst was kept at 175°C for 20 minutes. Some electronic components may not be able to withstand such a high temperature
Chinese patent CN101280168A discloses a one-component addition type silicone electronic potting glue, but it needs to be cured by heating above 130°C, and its storage time is not mentioned

Method used

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  • Preparation of a silicone sealant modified by α-570 coupling agent
  • Preparation of a silicone sealant modified by α-570 coupling agent
  • Preparation of a silicone sealant modified by α-570 coupling agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0046] Example 2: Hydroxyl-terminated polydimethylsiloxane (107 glue) with a viscosity of 500,000Mpa and 80,000Mpa at a temperature of 25°C is made at a ratio of 1:1, with a total mass fraction of 100 parts by mass, and 50 parts by mass of fumed silica. 80 parts by mass of dimethyl silicone oil was added to the vacuum kneader, kneaded at room temperature for 30 minutes, then kneaded for 240 minutes at a temperature of 120° C. and a vacuum degree of 0.06 Mpa, and ground by a three-roll mill three times to obtain a base material. 10 parts of crosslinking agent methyltrimethoxysilane, 2.5 parts by mass of α-methacrylate methyltrimethoxysilane (self-synthesized), and 2.5 parts by mass of α-mercaptomethyltrimethoxysilane (self-synthesized) , Add a mixer and mix with the base material, and continue to stir for 20 minutes at a vacuum of 0.06Mpa and 60°C to obtain a silicone sealant. The details of the product performance test results are shown in the table.

Embodiment 3

[0047] Example 3: Hydroxyl-terminated polydimethylsiloxane (107 glue) with a viscosity of 500000Mpa and 80,000Mpa at a temperature of 25°C is made at a ratio of 1:1, with a total mass fraction of 100 parts by mass, and 50 parts by mass of precipitated silica. 80 parts by mass of dimethyl silicone oil was added to a vacuum kneader, kneaded for 30 minutes at room temperature, kneaded for 240 minutes at a temperature of 120° C. and a vacuum degree of 0.06 Mpa, and ground by a three-roll mill for three times to obtain a base material. Combine 10 parts of crosslinking agent methyltrimethoxysilane, 5 parts by mass of α-methacrylate methyltrimethoxysilane (self-synthesized), and continue stirring for 20min under the conditions of vacuum degree of 0.06Mpa and 60℃ to obtain organic For silicon sealant, the test results of product performance are shown in the table.

Embodiment 4

[0048] Example 4 Hydroxyl-terminated polydimethylsiloxane (107 glue) with a viscosity of 500,000Mpa and 80,000Mpa at a temperature of 25°C is formulated at a ratio of 1:1, with a total mass fraction of 100 parts by mass, and 50 parts by mass of precipitated silica. 80 parts by mass of dimethyl silicone oil was added to the vacuum kneader, kneaded at room temperature for 30 minutes, then kneaded for 240 minutes at a temperature of 120° C. and a vacuum degree of 0.06 Mpa, and ground by a three-roll mill three times to obtain a base material. 10 parts of crosslinking agent methyltrimethoxysilane, 2.5 parts by mass of α-methacrylate methyltrimethoxysilane (self-synthesized), 2.5 parts by mass of α-mercaptomethyltrimethoxysilane (self-synthesized) , Continue stirring for 20 minutes at a vacuum of 0.06Mpa and 60°C to obtain a silicone sealant. The test results of the product performance are shown in the table.

[0049]

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PUM

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Abstract

The invention discloses a one-component silicone sealant modified by an alpha-methacryloxy silane (alpha-570) coupling agent and a preparation method of the one-component silicone sealant. The one-component silicone sealant is prepared from the following components in parts by mass: 100 parts of terminal hydroxyl polydimethylsiloxane (107glue), 20 to 50 parts of filler, 10 to 80 parts of a plasticizer, 1 to 10 parts of a cross-linking agent, 1 to 5 parts of the alpha-570 coupling agent and 1 to 5 parts of alpha-mercaptosilane (alpha-590) coupling agent. The one-component silicone sealant modified by the alpha-methacryloxy silane (alpha-570) has the advantages that firstly, raw materials of the alpha-silane coupling agent are low in price; secondly, the alpha-silane coupling agent is high in activity and easy to synthesize; thirdly, the alpha-570 coupling agent has a self-catalytic cross-linking effect; fourthly, the alpha-570 coupling agent and the alpha-590 coupling agent are compounded for use, so that the heat resistance of the sealant is favorably improved; and fifthly, the alpha-570 coupling agent can be used for the sealants such as a dealcoholization sealant, a deacetic sealant and a de-ketoxime sealant.

Description

Technical field [0001] The invention relates to an addition molding single-component organic silicon sealant and a manufacturing method thereof, and belongs to the field of polymer materials. Background technique [0002] Because sealant has excellent adhesion, tightness, high transparency, high and low temperature resistance, excellent weathering resistance, good hydrophobicity, resistance to engine oil and other characteristics, it is widely used in construction, electronic appliances, and automobiles. , Lighting and other industries. [0003] With the advancement of science and technology and the rapid development of society, all walks of life are required to have higher production efficiency. The one-component silicone sealant can be cured at room temperature and can be cured quickly under heating. Therefore, it has a broad application prospect in the rapidly developing intensive electronic appliances and new energy fields. The two-component silicone rubber is affected by th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/06C09J11/06C09J11/04C09J11/08
CPCC08L2205/025C08L2205/03C09J11/04C09J11/06C09J11/08C09J183/06C08L83/06C08L83/04C08K5/5425C08K5/5419C08K3/36C08K13/02C08K5/548
Inventor 王为国马庆宇李建权
Owner UNIV OF JINAN
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