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Preparation method for methyl vinyl silicone rubber

A technology of methyl vinyl silicon and dimethyl siloxane, which is applied in the field of preparation of methyl vinyl silicone rubber, can solve the problems of increasing energy and cost consumption, increasing equipment investment, prolonging the medium breaking time, etc., and achieving high performance Not easy to decompose, improve quality, excellent polymerization inhibition effect

Inactive Publication Date: 2016-01-13
浙江中天东方氟硅材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent requires the use of two-layer heating tubes in series, which prolongs the medium breaking time, not only increases equipment investment, but also increases energy and cost consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of methyl vinyl silicone rubber, prepared according to the following steps:

[0024] A. Add 500g of dimethylsiloxane mixed rings to the polymerization reactor, vacuumize and dehydrate at 80°C for 3 hours, and the vacuum degree is -0.09MPa;

[0025] B, after dehydration finishes, unload vacuum, add 0.005g p-hydroxyanisole, 0.17g vinyl double end cap, 0.48g vinyl ring body, 1.6g mass fraction is the tetramethylammonium hydroxide alkali glue of 1.6%, After stirring evenly, heat up, and seal the ring-opening polymerization reaction at 105°C±5°C for 3 hours;

[0026] C. After the polymerization reaction is over, raise the temperature to 200°C, vacuum -0.1MPa, vacuumize and remove low-molecular-weight volatiles for 3 hours, and obtain methyl vinyl silicone rubber.

Embodiment 2

[0028] A kind of methyl vinyl silicone rubber, prepared according to the following steps:

[0029] A. Add 500g of dimethylsiloxane mixed rings to the polymerization reactor, vacuumize and dehydrate at 85°C for 2 hours, and the vacuum degree is -0.1MPa;

[0030] B. After dehydration, remove the vacuum, add 0.003g methyl hydroquinone, 0.20g vinyl double head, 0.54g vinyl ring body and 2.50g mass fraction of 1.2% tetramethylammonium hydroxide alkali glue, stir evenly Then heat up, and seal the ring-opening polymerization reaction at 105°C±5°C for 3h;

[0031] C. After the polymerization reaction is completed, raise the temperature to 200°C, vacuum degree -0.09MPa, and vacuumize to remove low-molecular-weight volatile matter for 3 hours to obtain methyl vinyl silicone rubber.

Embodiment 3

[0033] A kind of methyl vinyl silicone rubber, prepared according to the following steps:

[0034] A. Add 500g of dimethylsiloxane mixed rings to the polymerization reactor, vacuumize and dehydrate at 80°C for 3 hours, and the vacuum degree is -0.08MPa;

[0035] B, after the dehydration finishes, unload the vacuum, add 0.004g p-methoxyphenol, 0.22g vinyl double head, 0.64g vinyl ring body, 2.10g mass fraction is the tetramethyl ammonium hydroxide alkali glue of 1.2%, After stirring evenly, heat up, and seal the ring-opening polymerization reaction at 105°C±5°C for 3 hours;

[0036] C. After the polymerization reaction is over, raise the temperature to 200°C, vacuum -0.1MPa, vacuumize and remove low-molecular-weight volatiles for 3 hours, and obtain methyl vinyl silicone rubber.

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Abstract

The invention discloses a preparation method for methyl vinyl silicone rubber. The preparation method comprises the following steps that 1, vacuumizing dewatering is performed on dimethyl siloxane cyclics mixtures at the temperature of 70 DEG C-90 DEG C for 1-4 h; 2, after dewatering is finished, divinyl tetramethyl disiloxane, methyl-vinyl-cyclosiloxane, tetramethylammonium hydroxide alkali gel and a polymerization inhibitor are added into a reaction kettle and evenly stirred, the temperature is increased, and sealed ring-opening polymerization is performed for 2-4 h; 3, after polymerization is finished, the temperature is increased to 180 DEG C-200 DEG C, and vacuumizing is performed to remove low-molecular volatile components for 2-4 h. According to the preparation method, polymerization crosslinking of unsaturated carbon-carbon double bond vinyl is effectively inhibited, and the temperature for removing the low-molecular volatile components is increased; accordingly, the content of the low-molecular volatile components in a raw rubber product is decreased, and the raw rubber product quality is effectively improved, so that the raw rubber product can meet the high-end use requirements.

Description

technical field [0001] The invention relates to a preparation method of raw rubber, in particular to a preparation method of methyl vinyl silicone rubber. Background technique [0002] Methyl vinyl silicone rubber, referred to as 110 raw rubber, is an unvulcanized high molar mass linear polydiorganosiloxane. Its main chain is composed of silicon and oxygen atoms, and the side chains connected to silicon are methyl and vinyl groups. The molecular weight is between 450,000 and 950,000. The molecules are easy to slip and can flow slowly in a cold state. Methyl vinyl silicone rubber is one of the important raw materials for preparing various homogeneous rubber materials and various elastic rubber products. department. [0003] The traditional method of preparing methyl vinyl silicone rubber is to vacuum dehydrate the dimethyl siloxane mixed ring (DMC), and then add vinyl double head (tetramethyl divinyl disiloxane) and ethylene The base ring body (tetramethyltetravinylcyclote...

Claims

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Application Information

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IPC IPC(8): C08G77/20C08G77/06
Inventor 邵向东杨庆红席先锋祝爱娟张洪涛
Owner 浙江中天东方氟硅材料股份有限公司
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