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Flame-retarding silicone sealing material and preparation method thereof

A sealing material and silicone technology, applied in the direction of adhesive additives, non-polymer adhesive additives, polymer adhesive additives, etc., can solve the problem of reducing the adhesion of silicone sealants, contamination of bonding substrates, Reduced colloidal modulus and other issues, to achieve good weather aging resistance, good flame retardancy, and good waterproof effect

Inactive Publication Date: 2018-11-16
芜湖市颂晖商贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this can achieve the effect of increasing the tensile strength and elongation at break, it reduces the colloidal modulus, is prone to oil leakage, and pollutes some bonding substrates. More importantly, it reduces the silicone sealant. cohesiveness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A flame-retardant silicone sealing material, calculated in parts by weight, including the following components:

[0025] α,ω-dihydroxy polydimethylsiloxane 45 parts, plasticizer 21 parts, filler 40 parts, crosslinking agent 2 parts, nano-magnesium aluminum hydrotalcite 0.6 part, γ-aminopropyl triethoxy group 7 parts of silane and 1.6 parts of dibutyltin dimonthly silicate. The filler is a mixture of fumed silica and nano calcium carbonate, and the mass ratio of fumed silica to nano calcium carbonate is 12:1. The crosslinking agent is a mixture of ethyl orthosilicate and methyltriethoxysilane.

[0026] The preparation method of plasticizer is:

[0027] Weigh 65wt% of trimethylchlorosilane and 35wt% of white oil and mix to obtain a mixed monomer. The mixed monomer oil bath is heated to 50°C, under the protection of inert gas, stannous octoate and ethylene glycol are added and reacted for 2h. Then it is cooled to room temperature and then treated with concentrated hydrochloric...

Embodiment 2

[0033] A flame-retardant silicone sealing material, calculated in parts by weight, including the following components:

[0034] α,ω-dihydroxy polydimethylsiloxane 40 parts, plasticizer 15 parts, filler 50 parts, crosslinking agent 0.1 part, nano-magnesium-aluminum hydrotalcite 0.8 part, γ-aminopropyl triethoxy 1 part of silane and 0.1 part of dibutyl tin dilaurate silicate. The filler is a mixture of fumed silica and nano calcium carbonate, and the mass ratio of fumed silica to nano calcium carbonate is 9:1. The crosslinking agent is a mixture of ethyl orthosilicate and methyltriethoxysilane.

[0035] The preparation method of plasticizer is:

[0036] Weigh 60wt% of trimethylchlorosilane and 40wt% of white oil and mix to obtain a mixed monomer. The mixed monomer oil bath is heated to 55°C, under the protection of inert gas, stannous octoate and ethylene glycol are added and reacted for 1.6h , Then cool to room temperature and then treat with concentrated hydrochloric acid, then ne...

Embodiment 3

[0039] A flame-retardant silicone sealing material, calculated in parts by weight, including the following components:

[0040] α,ω-dihydroxy polydimethylsiloxane 55 parts, plasticizer 25 parts, filler 30 parts, crosslinking agent 1.7 parts, nano-magnesium-aluminum hydrotalcite 1 part, γ-(methacryloyloxy) 10 parts of propyl trimethoxy silicon and 3 parts of dibutyl tin diacetate. The filler is a mixture of fumed silica and nano calcium carbonate, and the mass ratio of fumed silica to nano calcium carbonate is 10:1. The crosslinking agent is a mixture of ethyl orthosilicate and methyltriethoxysilane.

[0041] The preparation method of plasticizer is:

[0042] Weigh 70wt% of trimethylchlorosilane and 30wt% of white oil to obtain a mixed monomer. The mixed monomer oil bath is heated to 60°C, and under the protection of inert gas, stannous octoate and ethylene glycol are added and reacted for 1 hour. Then it is cooled to room temperature and then treated with concentrated hydrochloric...

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PUM

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Abstract

The invention provides a flame-retarding silicone sealing material and a preparation method thereof. The flame-retarding silicone sealing material is prepared from the following components in parts byweight: 40 to 55 parts of alpha,omega-dihydroxylpolydimethylsiloxane, 15 to 25 parts of plasticizer, 30 to 50 parts of filler, 0.1 to 3 parts of crosslinking agent, 1 to 10 parts of coupling agent, 0.6 to 1.2 parts of nano-grade magnesium-aluminum hydrotalcite and 0.1 to 3 parts of catalyst, wherein the plasticizer is mainly prepared from trimethylchlorosilane and white oil. The preparation method comprises the following steps: 1) dehydrating alpha,omega-dihydroxylpolydimethylsiloxane and the filler; cooling to room temperature to obtain a base material; 2) adding the plasticizer, the crosslinking agent, nano-grade magnesium-aluminum hydrotalcite, the coupling agent and the catalyst into the base material; stirring under a vacuum condition to obtain the flame-retarding silicone sealing material. The flame-retarding silicone sealing material provided by the invention not only has good flame-retarding performance, but also has good anti-ageing performance and bonding performance.

Description

Technical field [0001] The invention belongs to the technical field of sealing materials for construction, and specifically relates to a flame-retardant silicone sealing material and a preparation method thereof. Background technique [0002] Silicone sealant has excellent temperature resistance, weather resistance, aging resistance, non-cracking, earthquake resistance and moisture resistance, and is widely used in the fields of construction, electronics, automobiles, and aerospace. Silicone sealing materials are widely used building sealing materials, but generally low elongation flame-retardant silicone sealing materials cannot meet the requirements of the high displacement ability of concrete joints, and their adhesion to the concrete itself is not good, and it is easy to crack , So that the sealing effect is lost, and the maintenance cost is too high. With the enhancement of people's fire safety awareness, the requirements for the fire protection level of sealants are gettin...

Claims

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Application Information

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IPC IPC(8): C09J183/04C09J11/04C09J11/06C09J11/08
CPCC08K2003/265C08K2201/011C08L2201/02C09J11/04C09J11/06C09J11/08C09J183/04C08L91/00C08K13/04C08K7/00C08K3/36C08K3/26C08K5/5406
Inventor 汪泽维汪鹏
Owner 芜湖市颂晖商贸有限公司
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