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Composite sulfuration improver, preparation thereof and application thereof

A technology of improver and accelerator, applied in the field of vulcanizing agent, can solve the problems of loss of use value of vulcanizing agent, slow vulcanization speed and high decomposition temperature, and achieve the effects of inhibiting blooming phenomenon, reducing vulcanization temperature and simple preparation process

Active Publication Date: 2011-02-02
江苏强盛功能化学股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: using bis(2,4-dichlorobenzoyl) vulcanized silicone rubber peroxide, a large area of ​​blooming will be formed after a few weeks; , the problem of slow vulcanization speed; and some dibenzoyl organic peroxides containing chlorine substituents on the benzene ring have dual problems of high decomposition temperature, slow vulcanization speed and blooming, and even lost their application as vulcanizing agents. use value

Method used

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  • Composite sulfuration improver, preparation thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0014] According to the ratio in the table, add accelerator, defrosting agent, solid thickener and liquid diluent into the kneader, mix thoroughly, and grind evenly to obtain the finished compound vulcanization improver.

[0015] This table is the proportioning of embodiment 1-9 compound vulcanization improver

[0016]

Embodiment 10

[0018] In 100g heat vulcanized silicone rubber compound, add the bis(2,3-dichlorobenzoyl) of 2.5g, after mixing uniformly on the open mill, add the composite vulcanization improver 0.1 that above-mentioned embodiment 1 obtains g, knead again evenly, and the blooming phenomenon changes from the original 1 to 3 weeks of blooming to no frosting at all. Measure the vulcanization characteristics with a rotorless vulcanizer, keep it at 130°C for 8 minutes, and the optimum vulcanization time T 90 Reduced from the original 2.78min to 2.16min, the maximum torque M H From the original 1.216N.m to 1.578N.m.

Embodiment 11

[0020] In 100g heat-vulcanized silicone rubber compound, add 1.8g of bis(3,4-dichlorobenzoyl) peroxide, after mixing uniformly on the open mill, add the compound vulcanization improver 0.05 that above-mentioned embodiment 2 obtains g, knead again evenly, and the blooming phenomenon changes from the original 1 to 3 weeks of blooming to no frosting at all. Measure the vulcanization characteristics with a rotorless vulcanizer, keep it at 130°C for 8 minutes, and the initial vulcanization time is t s1 Reduced from the original 0.42min to 0.34min, the maximum torque M H Increased from the original 1.190N.m to 1.488N.m.

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Abstract

The invention provides a compound vulcanizing improver and the preparation method and application thereof and pertains to the field of vulcanizing agents. The compound vulcanizing improver is composed of the raw materials of the following weight portion ratios: a portion of improver, 0.8 to 14 portion of defrosting agents, less than or equal to 5 portions of liquid diluents and less than or equalto 0.533 portion of solid thickener. The application of the compound vulcanizing improver to heat vulcanization silicone rubber has the advantages that: A. the curing temperature and curing time can be reduced to a great extent, thus achieving the purpose of reducing production cost and increasing the production efficiency; B. the blooming of heat vulcanization silicone rubber matrix can be effectively restrained and the health grade of the heat vulcanization silicone rubber matrix can be improved; C. the preparation method requires no complex equipment, for instance, kneaders and three-roll grinders are necessary existing equipment in the rubber production industry and are not acquired otherwise, therefore, the preparation technology is simple.

Description

technical field [0001] The invention relates to a compound vulcanization improver, and also relates to a preparation method of the compound vulcanization improver and an application of the compound vulcanization improver prepared by the method, which is used for thermal vulcanization of silicone rubber and belongs to the field of vulcanization agents. Background technique [0002] Benzoyl organic peroxides are used as vulcanizing agents, mainly used for extrusion vulcanization of silicone rubber. However, benzoyl organic peroxide vulcanizing agents include the most widely used bis(2,4-dichlorobenzoyl) peroxide in China and the environmentally friendly new halogen-free extruder represented by p-toluyl peroxide. Including vulcanizing agent, there are always certain defects in practical application. For example: using bis(2,4-dichlorobenzoyl) vulcanized silicone rubber peroxide, a large area of ​​blooming will be formed after a few weeks; , the problem of slow vulcanization s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K5/17C08K3/34C08K3/22C08K13/02C08K5/01C08K5/12C08K3/36C08L83/04C08K5/14C08J3/24
Inventor 应立曹俊锋陆靖
Owner 江苏强盛功能化学股份有限公司
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