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Pretreatment method for base rubber of single-component dealcoholized type room temperature vulcanized silicone rubber

A room temperature vulcanization and dealcoholization technology, which is used in the production of dealcoholized room temperature vulcanized silicone rubber, can solve the problems of irritating ammonia odor, corrosiveness, and volatile n-butylamine.

Inactive Publication Date: 2016-01-13
TANGSHAN SANYOU SILICON IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst n-butylamine used in the reaction is volatile, has an irritating ammonia odor, and is corrosive. This method has a better treatment effect on low-viscosity 107 glue, and the treatment effect of high-viscosity 107 glue needs to be verified.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of pretreatment method for the base rubber of one-component dealcoholized RTV silicone rubber, which is carried out according to the following steps:

[0029] The base glue is 107 glue. First, add 1800g of 107 glue with a viscosity of 20000mPa·s, 1100g of 107 glue with a viscosity of 50000mPa·s, and 100g of 107 glue with a viscosity of 80000mPa·s into the planetary stirring kettle. , the rotating speed of the stirring device is 35r / min, and the base glue is stirred until it is evenly mixed.

[0030] In the above-mentioned planetary stirring kettle, add potassium hydroxide alkali glue 42.50g, methyltrimethoxysilane 36.67g successively, in the potassium hydroxide alkali glue, the potassium hydroxide mass concentration is 1.05%, open stirring under the condition of room temperature and normal pressure, the stirring device The rotating speed is 35r / min, and the reaction time is 60min.

[0031] After the above reaction, 153 g of phosphoric acid gel was added for neut...

Embodiment 2

[0037] A kind of pretreatment method for the base rubber of one-component dealcoholized RTV silicone rubber, which is carried out according to the following steps:

[0038] Add 3000g of 107 glue with a viscosity of 60000mPa·s into the stirring kettle, turn on the stirring at room temperature and normal pressure, and the rotating speed of the stirring device is 40r / min. 36.67 g of oxysilane, the mass concentration of potassium hydroxide in the potassium hydroxide alkali glue is 1.05%, the stirring is turned on under the condition of room temperature and normal pressure, the rotating speed of the stirring device is 40r / min, and the reaction time is 75min.

[0039] After the above reaction, 153 g of phosphoric acid gel was added for neutralization. The phosphoric acid mass concentration in the phosphoric acid gel was 0.57%. The stirring was turned on under the condition of room temperature and normal pressure. The rotating speed of the stirring device was 40 r / min, and the reactio...

Embodiment 3

[0044] A kind of pretreatment method for the base rubber of one-component dealcoholized RTV silicone rubber, which is carried out according to the following steps:

[0045] Add 3000g of 107 glue with a viscosity of 20000mPa·s into the stirring kettle, turn on the stirring under the condition of room temperature and normal pressure, the rotation speed of the stirring device is 30r / min, and stir until the mixing is uniform; add 32.57g of potassium hydroxide alkali glue, methyl trimethyl 38.11 g of oxysilane, the mass concentration of potassium hydroxide in the potassium hydroxide alkali glue is 1.37%, the stirring is turned on under the condition of room temperature and normal pressure, the rotating speed of the stirring device is 30r / min, and the reaction time is 650min.

[0046] After the above reaction, 109.01 g of phosphoric acid gel was added for neutralization. The phosphoric acid mass concentration in the phosphoric acid gel was 0.80%. The stirring was started at room temp...

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PUM

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Abstract

The invention relates to a pretreatment method for base rubber of single-component dealcoholized type room temperature vulcanized silicone rubber, and belongs to the field of dealcoholized type room temperature vulcanized silicone rubber. The pretreatment method comprises the following steps that a catalytic reaction is carried out, wherein the base rubber with the viscosity ranging from 10,000 mPa.s to 60,000 mPa.s is fed into a reaction still with a stirring device, and a catalyst and a cross-linking agent are sequentially added; a neutral reaction is carried out, wherein after the reaction is finished, neutralizer accounting for 0.2-10 parts by mass is added for the neutral reaction; a devolatiligation process is carried out, wherein after neutralization, low components generated in the reaction are all removed in the water removal process of the base rubber. 107 rubber treated through the steps is subjected to 1HNMR, 29Si-NMR and IR analysis and contains no silicon hydroxyl. No obvious rising phenomenon occurs when the treated 107 rubber is used as raw materials for preparing the single-component dealcoholized type room temperature vulcanized silicone rubber. Under the condition of accelerated aging, surface drying after placing, curing time, extrusion and the like have no obvious changes.

Description

technical field [0001] The invention relates to a pretreatment method for base rubber of one-component dealcoholized room temperature vulcanized silicone rubber, which belongs to the production field of dealcoholized room temperature vulcanized silicone rubber. Background technique [0002] One-component room temperature vulcanizing silicone rubber is a complex composed of hydroxyl-terminated polydimethylsiloxane as the base polymer, trifunctional silane as the crosslinking agent, and supplemented by fillers, plasticizers and catalysts. When exposed to the air, it reacts with moisture in the air to polycondense low molecules, and forms an elastomer after curing. According to the types of by-products released during vulcanization, one-component room temperature adhesives can be divided into deacidification, deamination type, deketoxime type, and dealcoholization type. [0003] Among them, one-component dealcoholized room temperature vulcanized silicone rubber is increasingly...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08J3/00C08L83/07C08L83/04C08K3/36C08K3/26C08K5/5419
Inventor 乔艳慧刘思佳曹鹤李献起刘秋艳王春英孙长江
Owner TANGSHAN SANYOU SILICON IND
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