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Alpha-isocyanate silane coupling agent-modified sealant

A technology based on silane coupling agent and isocyanate, which is applied in the field of addition type one-component silicone sealant and its manufacturing, which can solve the problem that electronic components cannot withstand such a high level, can only reach 0.4mm, and the storage time is not mentioned, etc. problems, to achieve good bonding performance, wide operating temperature, better interface improvement effect

Inactive Publication Date: 2018-01-30
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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  • Alpha-isocyanate silane coupling agent-modified sealant
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  • Alpha-isocyanate silane coupling agent-modified sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment one will be 500000 at temperature 25 ℃ viscosity and 80000 Hydroxyl-terminated polydimethylsiloxane in a ratio of 1:1, a total of 100 parts by mass, 50 parts by mass of fumed silica, and 80 parts by mass of dimethyl silicone oil were added to a vacuum kneader and mixed evenly, heated to 120°C And vacuum dehydration for 4 hours, after mixing evenly, nitrogen gas is introduced, the vacuum environment is released, and after cooling down, the base material is obtained by grinding with a three-roll mill. Add 10 parts by mass of tetraethyl orthosilicate to the base material, 5 parts by mass of α-isocyanatomethyltrimethoxysilane (self-synthesized), add to the mixer and mix with the base material, and continue vacuum stirring for 10 minutes under vacuum to obtain α- Isocyanatomethyltrimethoxysilane modified one-component silicone sealant, the test results of product performance are shown in the table.

Embodiment 2

[0035] Embodiment two will be 500000 at temperature 25 ℃ viscosity and 80000 Hydroxyl-terminated polydimethylsiloxane in a ratio of 1:1, a total of 100 parts by mass, 50 parts by mass of fumed silica, and 80 parts by mass of dimethyl silicone oil were added to a vacuum kneader and mixed evenly, heated to 120°C And vacuum dehydration for 4 hours, after mixing evenly, nitrogen gas is introduced, the vacuum environment is released, and after cooling down, the base material is obtained by grinding with a three-roll mill. Add 10 parts by mass of tetraethyl orthosilicate to the base material, 4 parts by mass of α-isocyanatomethyltrimethoxysilane (self-synthesized), add to the mixer and mix with the base material, and continue vacuum stirring for 10 minutes under vacuum to obtain α- Isocyanatomethyltrimethoxysilane modified one-component silicone sealant, the test results of product performance are shown in the table.

Embodiment 3

[0036] Example 3 The viscosity will be 500000 at a temperature of 25°C and 80000 Hydroxyl-terminated polydimethylsiloxane in a ratio of 1:1, a total of 100 parts by mass, 50 parts by mass of fumed silica, and 80 parts by mass of dimethyl silicone oil were added to a vacuum kneader and mixed evenly, heated to 120°C And vacuum dehydration for 4 hours, after mixing evenly, nitrogen gas is introduced, the vacuum environment is released, and after cooling down, the base material is obtained by grinding with a three-roll mill. Add 10 parts by mass of tetraethyl orthosilicate to the base material, 3 parts by mass of α-isocyanatomethyltrimethoxysilane (self-synthesized), add to the mixer and mix with the base material, and continue vacuum stirring for 10 minutes under vacuum to obtain α- Isocyanatomethyltrimethoxysilane modified one-component silicone sealant, the test results of product performance are shown in the table.

[0037]

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Abstract

The invention discloses single-component organic silicone sealant and a preparation method thereof. The single-component organic silicone sealant is prepared from the following components: terminal-hydroxyl polydimethylsiloxane (107-glue), filler, a plasticizing agent, a cross-linking agent and an alpha-isocyanate silane coupling agent which are in the mass part ratio of 100 to (20 to 50) to (10 to 80) to (1 to 10) to (1 to 5). The single-component organic silicone sealant and the preparation method thereof have the following advantages that: 1, the innovation points are that the used couplingagent is the alpha-silane coupling agent and the raw materials of the single-component organic silicone sealant are low in cost; 2, the alpha-silane coupling agent has the characteristics of high activity and easiness in synthesis, the curing time is shortened, and the sealant can be cured without a catalyst; 3, isocyanate groups have a more obvious effect on binding the 107-glue and bare hydroxyl groups fumed silica compared with other types of coupling agents; 4, the alpha-isocyanate silane coupling agent can be used for the sealant of a dealcoholization type, a deacetic type, a deoximationtype and the like.

Description

technical field [0001] The invention relates to an addition-type one-component silicone sealant and a manufacturing method thereof, belonging to the field of polymer materials. Background technique [0002] Because the sealant has excellent adhesion, sealing, high transparency, high and low temperature resistance, excellent weather aging resistance, good hydrophobicity, oil erosion resistance and other characteristics, it is widely used in construction, electronic appliances, automobiles, etc. , 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 conditions. Therefore, it has broad application prospects in the rapidly developing intensive electronic appliances and new energy fields. Due to the influence of the mixing ratio and ...

Claims

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Application Information

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IPC IPC(8): C09J183/06C09J11/04C09J11/06C09J11/08C07F7/18
Inventor 马庆宇王为国李建权
Owner UNIV OF JINAN