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Dealcoholized room temperature vulcanized silicone rubber sealant and preparation method thereof

A room temperature vulcanization and sealant technology, applied in adhesives and other directions, can solve the problems of high temperature and high humidity resistance and poor storage performance, and achieve the effect of improving storage performance, simple preparation process and eliminating process problems.

Active Publication Date: 2022-01-21
HAINAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention aims at the problem of poor high temperature and high humidity resistance and storage performance of the dealcoholized room temperature vulcanized silicone rubber sealant. The present invention provides a dealcoholized room temperature vulcanized silicone rubber sealant and its preparation method. Hydroxyl-terminated polydimethylsiloxane is used after capping. The capping process is simple, and the reaction can be completed quickly at room temperature. The prepared sealant has excellent high temperature and high humidity resistance and good storage performance, and can be applied to Sealing and bonding of electronics, photovoltaics, home appliances, automobiles and other industries

Method used

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  • Dealcoholized room temperature vulcanized silicone rubber sealant and preparation method thereof
  • Dealcoholized room temperature vulcanized silicone rubber sealant and preparation method thereof
  • Dealcoholized room temperature vulcanized silicone rubber sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Select α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20000mpa.s and simethicone oil with a viscosity of 100mpa.s. The component ratios are as follows:

[0036] A. α, ω-Dihydroxypolydimethylsiloxane 100 parts

[0037] B. 1.3 parts of capping agent

[0038] C. 0.03 parts of trifluoromethanesulfonic acid

[0039] D. 15 parts of simethicone oil

[0040] E. Calcium carbonate 120 parts

[0041] F. 4.5 parts of methyltrimethoxysilane

[0042] G. 2 parts of γ-aminopropyltriethoxysilane

[0043] H. 3 parts of bis(ethyl acetoacetate) diisopropyl titanate

[0044] Pass N 2 Add the A, B, and C components of the above viscosity and parts into the reaction kettle under protection, stir at room temperature for 15 minutes, and then stir for 10 minutes under the vacuum condition of -0.09~-0.1MPa to remove small molecules, and then add D and E components , Stir for 30 minutes under vacuum condition of -0.09~-0.1MPa, after mixing evenly, add components F, G and H in seque...

Embodiment 2

[0046] Choose α, ω-dihydroxypolydimethylsiloxane with a viscosity of 6000mpa.s and simethicone oil with a viscosity of 500mpa.s. The component ratios are as follows:

[0047] A. α, ω-Dihydroxypolydimethylsiloxane 100 parts

[0048] B. 1.8 parts of capping agent

[0049] C. 0.05 parts of trifluoromethanesulfonic acid

[0050] D. 10 parts of simethicone oil

[0051] E. 100 parts of calcium carbonate, 12 parts of fumed white carbon black

[0052] F. Vinyltrimethoxysilane 4 parts

[0053] G. 0.8 parts of γ-aminoethylaminopropyltrimethoxysilane

[0054] H. Tetraisopropyl titanate 0.8 parts

[0055] Pass N 2 Add the A, B, and C components of the above viscosity and parts into the reaction kettle under protection, stir at room temperature for 18 minutes, then stir for 10 minutes under the vacuum condition of -0.09~-0.1MPa to remove small molecules, and add D and E components , Stir for 30 minutes under vacuum condition of -0.09~-0.1MPa, after mixing evenly, add components F, G a...

Embodiment 3

[0057] The main difference from Example 1 is that the proportion of components is different.

[0058] A. α, ω-Dihydroxypolydimethylsiloxane 100 parts

[0059] B. 0.5 parts of capping agent

[0060] C. 0.1 parts of trifluoromethanesulfonic acid

[0061] D. 10 parts of simethicone oil

[0062] E. Calcium carbonate 100 parts

[0063] F. 3 parts of methyltrimethoxysilane

[0064] G. 0.5 parts of γ-aminopropyltriethoxysilane

[0065] H. 5 parts of bis(ethyl acetoacetate) diisopropyl titanate.

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Abstract

The invention provides a dealcoholized room temperature vulcanized silicone rubber sealant and a preparation method thereof. The sealant comprises, by weight, A, 100 parts of hydroxyl-terminated polydimethylsiloxane; 0.5-4 parts of an end-capping reagent; 0.01-0.1 part of an end-capping catalyst; 10-30 parts of dimethyl silicone oil; 80-150 parts of a reinforcing filler; 3-8 parts of a cross-linking agent; 0.5-3 parts of a silane coupling agent; and 0.5-5 parts of a moisture curing catalyst. According to the invention, the end-capping reagent is adopted to carry out end capping on the hydroxyl-terminated polydimethylsiloxane, the preparation process is rapid, simple and convenient, the reaction degree is high, the residual silicon hydroxyl is few, and the sealant has excellent high-temperature and high-humidity resistance and storage performance, and can be applied to sealing and bonding in the industries of electronics, photovoltaics, household appliances, automobiles and the like.

Description

technical field [0001] The invention relates to the field of rubber sealants, in particular to a dealcoholized room temperature vulcanized silicone rubber sealant and a preparation method thereof. Background technique [0002] Room temperature vulcanized silicone rubber sealant is composed of polysiloxane, crosslinking agent, silane coupling agent, catalyst, filler, etc. It is stored in the package before use, and is extruded from the package when used, and can be separated from the air at room temperature. The water vapor reaction in it solidifies, easy to use, good weather resistance, wide temperature range, good insulation performance, widely used in electronics, photovoltaics, automobiles, home appliances and other fields. Room temperature vulcanized silicone rubber sealant can be divided into dealcoholized type, deketoxime type, deacidified type, etc. according to the reaction type. Dealcoholized silicone rubber sealant releases small alcohol molecules during the reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/08C08G77/38
CPCC09J183/08C08G77/388Y02E10/50
Inventor 王德波王映品李功捷赵志斌王艺臻曲轶
Owner HAINAN NORMAL UNIV
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