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Single-composition room-temperature vulcanized silicone rubber sealant and preparation method thereof

A room temperature vulcanization and sealant technology, applied in the field of sealants, can solve the problems of high environmental temperature and humidity dependence, difficulty in meeting production efficiency, and decline in curing speed, and achieve the effects of shortening curing time, increasing the scope of use, and good weather resistance

Active Publication Date: 2015-04-08
富乐(苏州)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Single-composition room-temperature vulcanized silicone rubber sealant and preparation method thereof

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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 -...

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 -...

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Abstract

A single-composition room-temperature vulcanized silicone rubber sealant and a preparation method thereof are disclosed. The sealant is composed of the following compositions in parts by weight: (A) 100 parts of alpha, omega-dihydroxy polydimethylsiloxane, (B) 10-30 parts of dimethicone, (C) 5-10 parts of a multi-functionality silane cross-linking agent mixture, (D) 1-5 parts of a silane coupling agent, (E) 50-150 parts of a reinforcing filling material, and (F) 0.1-0.3 parts of a catalyst; and the composition (C) is prepared by mixing the following components in percent by weight: C1, 0-30% of methyltris(methylethylketoxime)silane , C2, 0-30% of vinyltris(methylethylketoxime)silane, and C3, 50-80% of a ketoximinosilane partial hydrolysate. The novel multi-functionality silane mixture is employed as a cross-linking agent, so that the curing speed and the curing initial-stage strength are greatly improved, the dependence of the sealant to environment temperature and humidity is reduced, and the sealant still has relatively good curing speed under the conditions of low temperature and low humidity.

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 Applications(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
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