Room-temperature vulcanized one-component dealcoholized silicone rubber sealant and preparation method thereof

A technology of room temperature vulcanization and silicone rubber, which is applied in the direction of chemical instruments and methods, adhesives, adhesive additives, etc., can solve the problems of decreased curing performance, difficult bonding performance, poor storage performance and bonding performance, and achieve improved bonding Good performance, good yellowing resistance, and the effect of solving yellowing

Active Publication Date: 2014-03-19
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AI-Extracted Technical Summary

Problems solved by technology

Dealcoholized silicone rubber sealant has low odor and meets environmental protection requirements, but its storage performance and adhesive performance are poor. The storage performance can be improved by adding hydroxyl scavenger, but it is difficult to improve the adhesive performance
Generally, the adhesiveness of silicone rubber sealants is mainly improved by adding silane coupling agents. Aminosilane coupling agents are widely used in other types of silicone rubber sealants due to their good adhesion, but they are used in titanic acid Although the adhesive performance of the sealant can be improved when the ester dealcoholization system is used, due to the high reactivity of titanate, it is easy to re...
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The invention discloses a room-temperature vulcanized one-component dealcoholized silicone rubber sealant and a preparation method thereof. The sealant comprises the following components in parts by weight: 100 parts of (A) alpha, omega-dihydroxyl polydimethylsiloxane, 10-30 parts of (B) simethicone, 5-10 parts of (C) a cross-linking agent, 1-5 parts of (D) a silane coupling agent, 50-150 parts of (E) reinforcing filler, 0.5-3 parts of (F) a catalyst and 0.5-2 parts of (G) storage stabilizer. Due to addition of the silane coupling agent containing various active functional groups, the defect that common dealcoholized silicone rubber sealant cannot have good adhesion performance and good storage performance at the same time is overcome, and storage performance is not affected when the adhering performance is improved. In addition, as the sealant uses the titanate catalyst with low yellowing property, the sealant has excellent yellowing resistance, the defect that common dealcoholized silicone rubber sealant is easy to yellow is overcome, and the sealant provided by the invention can be widely applied to adhering and sealing in the industries such as electronics, automobiles and home appliances.

Application Domain

Non-macromolecular adhesive additivesOther chemical processes

Technology Topic

Ptru catalystSilicone oil +11


  • Room-temperature vulcanized one-component dealcoholized silicone rubber sealant and preparation method thereof


  • Experimental program(1)
  • Comparison scheme(2)

Example Embodiment

[0041] Examples:
[0042] Choose α,ω-dihydroxy polydimethylsiloxane with a viscosity of 20000mpa.s and dimethyl silicone oil with a viscosity of 500mpa.s. The component ratios are as follows:
[0043] A. 100 parts of α, ω-dihydroxy polydimethylsiloxane
[0044] B. 20 parts of dimethyl silicone oil
[0045] C. 8 parts of methyltrimethoxysilane
[0046] D. The above silane coupling agent 2 servings
[0047] E. 80 parts of calcium carbonate, 10 parts of fumed white carbon black
[0048] F. Tetra-tert-amyl titanate 2 parts
[0049] G. 1 part of hexamethyldisilazane
[0050] Add the above-mentioned hydroxy-terminated polydimethylsiloxane, dimethyl silicone oil and fillers with the above viscosity and parts into the stirring tank, and stir for 2~4 under the conditions of 110℃~130℃, -0.09~-0.1MPa vacuum After hours, the temperature is lowered to below 40°C, and the above-mentioned parts of methyltrimethoxysilane, silane coupling agent, tetra-tert-amyl titanate, and hexamethyldisilazane are sequentially added and stirred uniformly.



Description & Claims & Application Information

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