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High-temperature vulcanized silicone rubber with both electrical conductivity and ceramization potential, and preparation method thereof

A thermally vulcanized silicone rubber and high-temperature vulcanization technology, which is applied in the field of thermally vulcanized silicone rubber materials, can solve problems such as poor compatibility between carbon black and rubber materials, poor material processing performance, and deviation in electrical conductivity.

Inactive Publication Date: 2020-12-22
苏州雷朗新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when preparing conductive silicone rubber, the following problems will also occur: ① In order to prepare high-conductivity silicone rubber, the filling amount of carbon black continues to increase, resulting in an increase in the viscosity of silicone rubber and poor material processing performance; ②The surface activity of the selected carbon black is too strong, which leads to the decrease of the effect of the vulcanizing agent and the instability of the vulcanized product; ③The carbon black contains a small amount of sulfur and volatile impurities, which will hinder the vulcanization and reduce the vulcanization performance; ④The selected The compatibility between carbon black and rubber is not good, and the rheology of the prepared mixed silicone rubber under the forming pressure will cause elastic internal distortion and deviation of electrical conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation method of high-temperature vulcanized silicone rubber with both electrical conductivity and ceramization, the specific process is as follows:

[0046] a), measure according to the weight ratio, first weigh the two ends of the molecule (CH 2 =CH)(CH 3 ) 2 SiO 1 / 2 Chain link capping, (CH 2 =CH)(CH 3 ) The molar fraction of SiO chain link is 0.1%, (CH 3 ) 2The molar fraction of SiO chain link is 99.9%, the methyl vinyl silicone rubber raw rubber 100 parts of average degree of polymerization of about 7000, 40 parts of fumed white carbon black, 4 parts of hydroxyl silicone oil (hydroxyl mass fraction is 0.08%), it is Put it into an internal mixer and mix evenly, set the temperature in the internal mixer to 130°C, and mix for 1 hour to obtain a free-flowing granular mixture 1;

[0047] b) Weigh 50 parts of muscovite with a filler particle size of 50 μm and 20 parts of glass powder with a melting point of about 545 ° C, put it into an internal mixer and ...

Embodiment 2

[0052] The preparation method of high-temperature vulcanized silicone rubber with both electrical conductivity and ceramization, the specific process is as follows:

[0053] a), measure according to the weight ratio, first weigh the two ends of the molecule (CH 2 =CH)(CH 3 ) 2 SiO 1 / 2 Chain link capping, (CH 2 =CH)(CH 3 ) The molar fraction of SiO chain link is 0.1%, (CH 3 ) 2 The mole fraction of the SiO chain link is 99.9%, 100 parts of methyl vinyl silicone rubber raw rubber with an average degree of polymerization of about 7000, 40 parts of precipitated white carbon black, and 4 parts of hydroxyl silicone oil (the mass fraction of hydroxyl group is 0.08%). Put it into an internal mixer and mix evenly, set the temperature in the internal mixer to 130°C, and mix for 1 hour to obtain a free-flowing granular mixture 1;

[0054] b) Weigh 50 parts of muscovite with a filler particle size of 50 μm and 20 parts of glass powder with a melting point of about 545 ° C, put it i...

Embodiment 3

[0060] The preparation method of high-temperature vulcanized silicone rubber with both electrical conductivity and ceramization, the specific process is as follows:

[0061] a), measure according to the weight ratio, first weigh the two ends of the molecule (CH 2 =CH)(CH 3 ) 2 SiO 1 / 2 Chain link capping, (CH 2 =CH)(CH 3 ) The molar fraction of SiO chain link is 0.1%, (CH 3 ) 2 The molar fraction of SiO chain link is 99.9%, the methyl vinyl silicone rubber raw rubber 100 parts of average degree of polymerization of about 7000, 40 parts of fumed white carbon black, 4 parts of hydroxyl silicone oil (hydroxyl mass fraction is 0.08%), it is Put it into an internal mixer and mix evenly, set the temperature in the internal mixer to 130°C, and mix for 1 hour to obtain a free-flowing granular mixture 1;

[0062] b) Weigh 30 parts of muscovite with a particle size of 50 μm for porcelain filler, wollastonite with a particle size of 55 μm and an aspect ratio of 3.1, and 20 parts of...

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Abstract

The invention discloses high-temperature vulcanized silicone rubber with both conductivity and ceramization potential, and a preparation method thereof. The high-temperature vulcanized silicone rubbercomprises the following components: raw methyl vinyl silicone rubber, raw methyl phenyl vinyl silicone rubber, a reinforcing filler, a conductive medium, a structured control agent, a fluxing agent,a ceramic forming filler, a coupling agent, a release agent and a vulcanizing agent. The method comprises the following steps: putting raw heat-vulcanized silicone rubber, the reinforcing filler, namely fumed silica, and silicone oil into an internal mixer, and carrying out stirring; uniformly blending the ceramic forming filler and the fluxing agent, and carrying out surface treatment by using the coupling agent; performing surface activation pretreatment on the conductive medium; and blending the above materials in a kneading machine to prepare the high-temperature vulcanized ceramic silicone rubber with both conductivity and ceramization potential. According to the invention, the advantages of good electrical properties and good mechanical properties are ensured, and the prepared rubberhas characteristics of easy processing, good weather resistance, good aging resistance and good low temperature resistance, and has important significance in the widening of the application fields ofsilicone rubber.

Description

Technical field: [0001] The invention relates to the technical field of thermally vulcanized silicone rubber materials, in particular to a high-temperature vulcanized silicone rubber that is both semiconductive and ceramizable and a preparation method thereof. Background technique: [0002] Statistics show that electrical wiring is an important cause of building fires. With the continuous advancement of urbanization in our country, the density of urban buildings has increased sharply, resulting in a high concentration of population, such as stations, airports, ports, opera theaters, office buildings, large shopping malls, hospitals, these highly populated places , Once a fire accident occurs, it will cause heavy losses. How to ensure the smooth flow of power and communication within a certain period of time in the event of a fire and reduce financial losses and casualties has become a top priority. [0003] As a new type of polymer refractory material, ceramic silicone rub...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/04C08K13/06C08K9/06C08K9/04C08K3/04C08K7/26C08K3/34C08K3/40C08K3/30C08K7/00
CPCC08L83/04C08L2201/04C08K2201/001C08L2205/025C08K13/06C08K9/06C08K9/04C08K3/04C08K7/26C08K3/34C08K3/40C08K3/30C08K7/00
Inventor 刘炎钱大海黄尹龙娟
Owner 苏州雷朗新材料科技有限公司
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