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

A room temperature vulcanization and sealant technology, which is applied in the field of sealants, can solve problems such as high environmental temperature and humidity dependence, difficulty in meeting production efficiency, and affecting winter use, and achieve the effects of shortening curing time, increasing the scope of use, and improving production efficiency

Active Publication Date: 2016-08-31
富乐(苏州)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the one-component sealant is cured, it is moisture-absorbing curing, which needs to be cured by absorbing water vapor in the air, and the water vapor can only slowly penetrate from the surface of the sealant to the inside, so its curing speed is slow and the initial strength of curing is low. It needs to be cured for more than 6 hours in the standard state (25°C, 50% RH) before it can be moved and packed, which is difficult to meet some occasions that require high production efficiency.
In addition, since the one-component sealant needs to rely on the absorption of water vapor in the air to cure, it is very dependent on the temperature and humidity of the environment, and the curing speed drops seriously under low temperature and low humidity conditions, which affects the use in winter

Method used

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

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Experimental program
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preparation example Construction

[0026] The present invention relates to a one-component room temperature vulcanized silicone rubber sealant and a preparation method thereof. The sealant comprises the following components (A) to (F), and each component is as follows by weight:

[0027] (A) 100 parts of α, ω-dihydroxy polydimethylsiloxane;

[0028] (B) 10-30 parts of simethicone oil;

[0029] (C) 5-10 parts of multifunctional silane crosslinking agent mixture;

[0030] (D) 1-5 parts of silane coupling agent;

[0031] (E) 50-150 parts of reinforcing filler;

[0032] (F) 0.1-0.3 parts of catalyst.

[0033] The (A) component is α, ω-dihydroxy polydimethylsiloxane, and its molecular structure is HO[(CH 3 ) 2 SiO] n H, n=300-1500, viscosity at 25°C is 1000-50000mpa.s, preferably α,ω-dihydroxy polydimethylsiloxane with viscosity of 20000mpa.s.

[0034] The (B) component is simethicone, and its molecular structure is (CH 3 ) 3 SiO[(CH 3 ) 2 SiO] n Si(CH 3 ) 3 , n=50~230, the viscosity at 25°C is 50-500...

Embodiment 1

[0045] Choose α, ω-dihydroxypolydimethylsiloxane with a viscosity of 20000mpa.s and simethicone oil with a viscosity of 500mpa.s. The component ratios are as follows:

[0046] A. 100 parts of α, ω-dihydroxy polydimethylsiloxane,

[0047] B. 20 parts of simethicone oil,

[0048] C. 8 parts of multifunctional silane crosslinking agent mixture,

[0049] D. Aminopropyltriethoxysilane 2 copies,

[0050] E. 100 parts of calcium carbonate, 10 parts of fumed silica,

[0051] F. 0.1 part of dibutyltin dilaurate;

[0052] Wherein the composition and weight percent of C polyfunctionality silane crosslinking agent mixture are:

[0053] C1: Methyltributylketoximosilane 20%,

[0054] C2: Vinyl tributylketoxime silane 0,

[0055] C3: Ketoximosilane partial hydrolyzate 80%;

[0056] Add the hydroxyl-terminated polydimethylsiloxane, dimethyl silicone oil and fillers with the above viscosity and parts into the stirring tank, and stir for 2 to 4 hours at 110°C to 130°C and -0.09 to -0.1...

Embodiment 2

[0058] Choose α, ω-dihydroxypolydimethylsiloxane with a viscosity of 20000mpa.s and simethicone oil with a viscosity of 500mpa.s. The component ratios are as follows:

[0059] A. 100 parts of α, ω-dihydroxy polydimethylsiloxane,

[0060] B. 20 parts of simethicone oil,

[0061] C. 8 parts of multifunctional silane crosslinking agent mixture,

[0062] D. Aminopropyltriethoxysilane 2 copies,

[0063] E. 100 parts of calcium carbonate, 10 parts of fumed silica,

[0064] F. 0.1 part of dibutyltin dilaurate;

[0065] Wherein the composition and weight percent of C polyfunctionality silane crosslinking agent mixture are:

[0066] C1: Methyltributanoximinosilane 0 ,

[0067] C2: Vinyl tributylketoxime silane 20%,

[0068] C3: Ketoximosilane partial hydrolyzate 80%;

[0069] Add the hydroxyl-terminated polydimethylsiloxane, dimethyl silicone oil and fillers with the above viscosity and parts into the stirring tank, and stir for 2 to 4 hours at 110°C to 130°C and -0.09 to -0.1...

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Abstract

The invention discloses a one-component room temperature vulcanized silicone rubber sealant and a preparation method thereof. The sealant composition and weight ratio are: (A) α,ω-dihydroxypolydimethylsiloxane 100 parts, (B ) 10‑30 parts of simethicone oil, (C) 5‑10 parts of multifunctional silane crosslinking agent mixture, (D) 1‑5 parts of silane coupling agent, (E) 50‑150 parts of reinforcing filler, ( F) Catalyst 0.1-0.3 part, the (C) component is made by mixing the following components by weight: C1: methyl tributylketoxime silane 0-30%, C2: vinyl tributylketoxime silane 0‑30%, C3: Ketoximosilane partial hydrolyzate 50‑80%; the present invention uses a new type of multifunctional silane mixture as a crosslinking agent, which can greatly improve the curing speed and initial strength of curing, and its effect on ambient temperature and humidity The dependence of the resin is reduced, and it still has a good curing speed under low temperature and low humidity conditions.

Description

technical field [0001] The invention relates to the field of sealants, in particular to a room temperature vulcanized silicone rubber sealant and a preparation method thereof. Background technique [0002] Room temperature vulcanized silicone rubber sealant refers to a silicone resin as the base resin, mixed with fillers, crosslinking agents, catalysts and other components, and can be cured at room temperature. With the advantages of wide temperature range, good weather resistance, and excellent insulation performance, it is widely used in electronics, automobiles, home appliances, construction and other industries. [0003] Room temperature vulcanized silicone rubber sealants can be divided into two-component and one-component in terms of packaging form. The two-component sealant is packaged in two containers before use. Generally, one component contains the base polymer and deep curing accelerator, and the other component contains the crosslinking agent and catalyst. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/06C09J183/04C09J11/06
Inventor 王德波肖明王瑶潘换明
Owner 富乐(苏州)新材料有限公司