Halogen-free flame-retardant solid silicone rubber condensing pipe and preparation method thereof

A flame-retardant, solid silicon technology, which is applied in the field of halogen-free flame-retardant solid silicone rubber cold-shrink tube and its preparation, can solve the problem of low flame-retardant grade, and achieve the effect of high mechanical properties and high expansion ratio

Inactive Publication Date: 2018-06-12
CHANGYUAN ELECTRONICS DONGGUAN +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to overcome the shortcomings of low flame-retardant grade (UL94-HB) of the existing silicone rubber cold-shrinkable tubes on the market, and develop a solid silicone rubber cold-shrinkable tube with good flame-retardant performance (conforming to UL94-V0 grade). Shrinkable tube, at the same time, it has the advantages of good mechanical properties, expansion ratio, and excellent retraction performance of conventional tubes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] The preparation method of the above-mentioned halogen-free flame-retardant solid silicone rubber cold shrinkable tube comprises the following steps:

[0040] Step 1: Preparation of compound rubber: add methyl vinyl silicone rubber, phenyl vinyl silicone rubber, vinyl silicone oil, fumed silica, and internal mold release agent to the internal mixer and mix evenly, heat up to 160ºC and vacuumize Stir for 4 hours. After cooling, add flame retardant and mix evenly. After standing at room temperature for 24 hours, add vulcanizing agent to the mixed rubber on the open mill with cooling water, and mix evenly.

[0041] Step 2: Rubber vulcanization: The rubber obtained in step 1 is vulcanized into a tube blank by extrusion molding, wherein the temperature of the vertical vulcanization tank is 530-600°C, the temperature of the horizontal vulcanization tank is 230-300°C, and the vulcanization speed is 1.5-3.0m / min.

[0042] Step 3: pipe expansion: the vulcanized pipe obtained in ...

preparation Embodiment 1

[0044] In parts by weight, take 90 parts of methyl vinyl silicone rubber, 15 parts of phenyl vinyl silicone rubber, 2 parts of vinyl silicone oil, 40 parts of fumed white carbon black, and 1 part of internal release agent zinc stearate and add it to the banburying Mix evenly with a machine, heat up to 160ºC and stir for 4 hours under vacuum. After cooling, add 60 parts of flame retardant (composed of 30 parts of aluminum hydroxide, 10 parts of molybdenum trioxide, and 20 parts of expandable graphite) and mix evenly. After 24 hours at room temperature, Add 1 part of vulcanizing agent (composed of 0.5 part of platinum complex catalyst and 0.5 part of hydrogen-containing silicone oil) to the mixed rubber material on the open mill with cooling water, and mix evenly.

[0045] The obtained rubber material was vulcanized into a tube blank by extrusion molding, the temperature of the vertical vulcanization tank was 550°C, the temperature of the horizontal vulcanization tank was 250°C, ...

preparation Embodiment 2

[0049] In parts by weight, take 95 parts of methyl vinyl silicone rubber, 5 parts of phenyl vinyl silicone rubber, 4 parts of vinyl silicone oil, 50 parts of fumed white carbon black, and 2 parts of internal release agent zinc stearate and add them to the banburying Mix evenly with a machine, heat up to 160ºC and stir in vacuum for 4 hours. After cooling, add 40 parts of flame retardant (composed of 20 parts of aluminum hydroxide, 10 parts of antimony trioxide, and 10 parts of expandable graphite) and mix evenly. After 24 hours at room temperature, , Add 2 parts of vulcanizing agent (composed of 1 part of platinum complex catalyst and 1 part of hydrogen-containing silicone oil) to the mixed rubber material on the open mill with cooling water, and mix evenly.

[0050] The obtained rubber material was vulcanized into a tube blank by extrusion molding, the temperature of the vertical vulcanization tank was 580°C, the temperature of the horizontal vulcanization tank was 270°C, and ...

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Abstract

A halogen-free flame-retardant solid silicone rubber condensing pipe is composed of, by weight, 85-95 parts of methyl vinyl silicone rubber, 5-15 parts of phenyl vinyl silicone rubber, 1-4 parts of vinyl silicone oil, 35-60 parts of fumed silica, 40-80 parts of flame retardant, 1-3 parts of internal releasing agent and 1-3 parts of vulcanizing agent. Molar content of vinyl in the methyl vinyl silicone rubber is 0.05-1.0%, and polymerization degree is 3000-5000; molar content of vinyl in the phenyl vinyl silicone rubber is 0.08-1.0%, molar content of phenyl is 15-25%, and polymerization degreeis 3000-5000; viscosity of the vinyl silicone oil is 30-50mPaS, and molar content of vinyl is 5.0%; specific surface area of fumed silica is 200-300m2 / g; the flame retardant is a mixture of two of ormultiple of aluminum hydroxide, molybdenum trioxide, antimonous oxide, cerium oxide and expandable graphite, expansion starting temperature is 400 DEG C, and grain size is 300-400 meshes. The condensing pipe has halogen-free flame-retardant characteristics, and flame-retardant performance of the condensing pipe can reach UL94-V0 grade.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant solid silicone rubber cold-shrinkable tube and a preparation method thereof. The cold-shrinkable tube not only has the high mechanical properties and high expansion ratio of conventional solid silicone cold-shrinkable tubes, but also has halogen-free flame-retardant properties , its flame retardant performance can reach UL94-V0 level. Background technique [0002] At present, the cold-shrinkable tubes on the market can be divided into silicone rubber cold-shrinkable tubes and EPDM cold-shrinkable tubes according to material classification. Silicone rubber cold shrink tubes are more widely used, and their applications are mainly concentrated in the communication and electric power industries. They are used as outer protective sleeves to play the role of waterproof and sealing. In recent years, with the rise of the new energy vehicle industry, some new materials have been used in new energy vehicle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08K13/04C08K7/24C08K3/22C08K3/36C08K5/098
CPCC08K2003/2213C08K2003/2227C08K2003/2255C08L83/04C08L2201/02C08L2201/22C08L2203/18C08L2205/025C08L2205/035C08K13/04C08K7/24C08K3/22C08K3/36C08K5/098C08K3/2279
Inventor 黄强刘军陈尚海鲁尔军鲁雪莲李可涛
Owner CHANGYUAN ELECTRONICS DONGGUAN
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