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Deoximation type room temperature vulcanized silicone rubber and preparation method thereof

A room temperature vulcanization and silicone rubber technology, which is applied in the field of deoxime RTV silicone rubber and its preparation, can solve the problems of fracture degradation, limiting deoxime RTV silicone rubber, and heat reversion, etc., and achieves high activity and good anti-reversion. The effect of originality, high cross-linking activity

Pending Publication Date: 2021-05-07
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although deoxime type RTV silicone rubber has achieved great development, there are still some defects that need to be solved urgently. To meet the required mechanical properties, the deoximation type RTV silicone rubber on the market usually needs to add organotin or metal salt catalysts. However, the addition of such catalysts will cause the polymer Si- The O chain segment breaks and degrades, softening the silicone rubber, and even turning it into a liquid, that is, the phenomenon of returning to the original state when heated, and the appearance of the returning phenomenon will lead to a significant decrease in the mechanical strength and hardness of the silicone rubber. This problem limits the deoxime Further application of type RTV silicone rubber

Method used

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  • Deoximation type room temperature vulcanized silicone rubber and preparation method thereof
  • Deoximation type room temperature vulcanized silicone rubber and preparation method thereof
  • Deoximation type room temperature vulcanized silicone rubber and preparation method thereof

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preparation example Construction

[0032] The preparation method of described linking agent comprises the following steps:

[0033] Mix silicate, butanone oxime and solvent, and heat to reflux for reaction.

[0034] The present invention uses the mixture of silicate and methyl ethyl ketone oxime after heating and refluxing reaction as cross-linking agent, finds that it has higher cross-linking activity, can omit the addition of organotin or metal salt catalyst, and achieves the same as adding. The mechanical properties of similar catalysts are basically similar, which avoids the silicone rubber in a heated and airtight environment. Because of the action of this type of catalyst, the polymer Si-O chain segment is broken and degraded, and then the silicone rubber softens, even liquefies, and returns to normal. original phenomenon. The obtained deoxime-type RTV silicone rubber has good reversion resistance, which can avoid softening of silicone rubber and decrease in mechanical properties in applications such as ...

Embodiment 1

[0064] This embodiment provides a deoxime type room temperature vulcanized silicone rubber and its preparation method, the steps are as follows:

[0065] (1) Preparation of crosslinking agent

[0066] Mix 50 parts of methyl silicate, 120 parts of methyl ethyl ketone oxime and 200 parts of toluene, heat and reflux at 160°C for 20 hours, then vacuumize to 5-10mmHg at 90°C, no distillate is considered to be a reaction stop, The mixture after the reaction is collected is the crosslinking agent.

[0067] (2) Prepare the base material

[0068] Add 100 parts of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20000mPa·s at 25°C and 80 parts of antimony trioxide into the kneader. Blending, dehydration and kneading for 180 minutes under low pressure, and discharging after cooling to obtain the base material.

[0069] (3) Preparation of deoxime type room temperature vulcanized silicone rubber

[0070] At room temperature, mix 30 parts of nano-calcium carbonate, 15 parts of th...

Embodiment 2

[0078] This embodiment provides a deoxime type room temperature vulcanized silicone rubber and its preparation method, the steps are as follows:

[0079] (1) Preparation of crosslinking agent

[0080] Mix 50 parts of methyl silicate, 120 parts of methyl ethyl ketone oxime and 200 parts of toluene, heat and reflux at 160°C for 20 hours, then vacuumize to 5-10mmHg at 90°C, no distillate is considered to be a reaction stop, The mixture after the reaction is collected is the crosslinking agent.

[0081] (2) Prepare the base material

[0082] Add 90 parts of α, ω-dihydroxy polydimethylsiloxane, 60 parts of aluminum hydroxide, and 10 parts of silicone oil at 25°C with a viscosity of 50,000 mPa·s into the kneader. Blending, dehydration and kneading for 60 minutes under the condition of ℃, and discharging after cooling to obtain the base material.

[0083] (3) Preparation of deoxime type room temperature vulcanized silicone rubber

[0084] At room temperature, mix 15 parts of whit...

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Abstract

The invention relates to deoximation type room temperature vulcanized silicone rubber and a preparation method thereof, and relates to the technical field of high-molecular polymers. The deoximation type room temperature vulcanized silicone rubber is prepared from the following raw materials in parts by weight: 80 to 100 parts of an organic polysiloxane polymer; 0-20 parts of a plasticizer; 5-30 parts of a filler; 5-15 parts of a cross-linking agent; and 1-5 parts of a coupling agent. The preparation method of the cross-linking agent comprises the following steps: mixing silicate ester, diacetyl monoxime and a solvent, and carrying out heating reflux reaction. By treating the cross-linking agent, the activity of the cross-linking agent is improved, addition of organic tin or metal salt catalysts can be omitted, basically similar mechanical properties are achieved, meanwhile, the reversion phenomenon is avoided, and good mechanical strength and hardness can be kept in a heated closed environment.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to deoxime room temperature vulcanized silicone rubber and a preparation method thereof. Background technique [0002] Deoxime type RTV silicone rubber (deoxime type room temperature vulcanization silicone rubber) is one of the fastest growing products in the domestic silicone market. Its main features are: at room temperature, it has better performance than alcohol type silicone sealant Fast curing speed and convenient construction. Therefore, deoxime type RTV silicone rubber has been widely used in civil construction, electronic appliances, vehicle transportation, aircraft and ships, machinery, chemical industry, light industry and other fields. [0003] Although deoxime type RTV silicone rubber has achieved great development, there are still some defects that need to be solved urgently. To meet the required mechanical properties, the deoximation type RTV silicone rubber on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K13/02C08K3/26C08K3/22C08K5/5465C08K5/5435C08K5/544C08K13/04C08K7/26
CPCC08L83/04C08K13/02C08K3/26C08K3/2279C08K5/5465C08K5/5435C08K5/544C08K3/22C08K2201/011C08K2003/265C08K2003/2227C08L2205/025C08L2201/02
Inventor 曾容
Owner GUANGZHOU BAIYUN CHEM IND
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