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One-component room temperature vulcanized silicone rubber sealant and preparation method thereof

A room temperature vulcanization and sealant technology, used in the field of sealants, can solve the problems of difficult to meet the requirements of high efficiency of the assembly line, difficult to adapt to the requirements of extensive bonding, poor bonding performance and curing speed, etc., to achieve good deep curing performance, Excellent bonding breadth, impact reduction effect

Inactive Publication Date: 2018-03-20
TONSAN ADHESIVES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] General dealcoholized silicone rubber sealants are composed of base rubber, fillers, crosslinking agents, catalysts and adhesion promoters. Dealcoholized silicone rubber sealants have low odor and meet environmental protection requirements, but their bonding performance and curing speed are relatively low. Difference
Dealcohol-type silicone rubber sealant is difficult to use aminosilane with strong alkalinity as coupling agent, and it has poor adhesion to common metal and plastic substrates. sexual demands
In addition, compared with other types of products, due to the lower reactivity of the crosslinking agent, the dealcoholized products have a slower overall curing speed and take a long time to complete curing, resulting in prolonged construction cycles and difficulty in meeting the high efficiency requirements of the assembly line

Method used

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  • One-component room temperature vulcanized silicone rubber sealant and preparation method thereof

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preparation example Construction

[0044] The preparation method of the above-mentioned one-component room temperature vulcanized silicone rubber sealant comprises the following steps:

[0045]Take the components (A), (B) and (C) in the above parts by weight and put them into the stirred tank, dehydrate at 110~130℃, -0.09~-0.1MPa vacuum condition for 2~4 hours, then cool down to 40℃ Add (D) and (E) components, and stir for 30 minutes under vacuum condition of -0.09~-0.1MPa until uniform without bubbles, and finally add (F) and (G) components, at -0.09~-0.1MPa Stir under vacuum for 30 minutes until uniform without bubbles.

Embodiment 1

[0048] Select α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20000mPa.s, and simethicone oil with a viscosity of 500mPa.s. The component ratios are as follows:

[0049] (A) α, ω-dihydroxy polydimethylsiloxane 100 parts

[0050] (B) 25 parts of simethicone oil

[0051] (C) 110 parts of calcium carbonate, 10 parts of fumed white carbon black

[0052] (D) 4 parts of methyltrimethoxysilane

[0053] (E) 2.5 parts of multifunctional silane copolymer

[0054] (F) 2.5 parts of two (ethyl acetoacetate) diisopropyl titanate

[0055] (G) 1.5 parts of 4A molecular sieve.

[0056] Wherein (E) polyfunctionality silane copolymer synthetic method is as follows:

[0057] In a three-necked flask equipped with a stirrer, a condenser and a dropping funnel, add 148g of vinyltrimethoxysilane under nitrogen, and slowly drop in 16.2g of 1% phosphoric acid aqueous solution while stirring at 30°C. Then continue to stir and react at 30°C for 6 hours, then add 179g of aminopropyltrimethoxy...

Embodiment 2

[0060] Select α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20000mPa.s, and simethicone oil with a viscosity of 500mPa.s. The component ratios are as follows:

[0061] (A) α, ω-dihydroxy polydimethylsiloxane 100 parts

[0062] (B) 20 parts of simethicone oil

[0063] (C) 130 parts of calcium carbonate

[0064] (D) 3.5 parts of vinyltrimethoxysilane

[0065] (E) 3 parts of multifunctional silane copolymer

[0066] (F) 3 parts of diisopropyl di(acetylacetonate) titanate

[0067] (G) 1 part of 4A molecular sieve.

[0068] Wherein (E) polyfunctionality silane copolymer synthetic method is as follows:

[0069] In a three-necked flask equipped with a stirrer, a condenser and a dropping funnel, add 148g of vinyltrimethoxysilane under nitrogen, and slowly drop in 16.2g of 1% phosphoric acid aqueous solution while stirring at 30°C. Continue to stir and react at 30°C for 6 hours, then add 236g of γ-glycidyl etheroxypropyl trimethoxysilane dropwise while stirring, heat up...

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Abstract

The invention discloses a single-component room temperature silicon sulfide rubber sealant and a preparation method thereof. The single-component room temperature silicon sulfide rubber sealant is prepared from the following components in parts by weight: 100 parts of alpha, omega-dihydroxyl polydimethylsiloxane (A), 10-25 parts of dimethicone (B), 80-150 parts of reinforcing filler (C), 3-5 parts of crosslinking agent (D), 2-4 parts of polyfunctional silane copolymer (E), 1-3 parts of catalyst (F), and 1-2 parts of storage stabilizer (G). The single-component room temperature silicon sulfide rubber sealant has the advantages that the bonding generality is excellent, the good binding on common metal and plastic materials is realized, the deep curing property is good, the curing waiting time is shortened, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of sealants, in particular to a one-component room temperature vulcanized silicone rubber sealant and a preparation method thereof. Background technique [0002] One-component room temperature vulcanized silicone rubber sealant refers to a sealant that is made of silicone resin as the base resin, mixed with fillers, crosslinking agents, catalysts and other components, and can be cured at room temperature. Curing, wide temperature range, good weather resistance, excellent insulation performance and other advantages, it has been widely used in electronics, automobiles, home appliances, construction and other industries. [0003] One-component RTV silicone rubber sealant can be divided into condensation type and addition type according to the crosslinking vulcanization mechanism, and condensation type can be divided into deacidification type, deketoxime type, dealcoholization type according to the type of by-products rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/06C09J183/04C09J11/08
CPCC08L2205/03C09J11/08C09J183/06C08L83/04
Inventor 王德波苏丹肖明王瑶
Owner TONSAN ADHESIVES INC
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