A kind of high-performance anti-tracking addition type liquid silicone rubber and its preparation method

A liquid silicone rubber and tracking technology, which is applied in the field of rubber insulating materials and silicone rubber insulating materials, can solve the problems of easy volatilization, harm to human body and environment, and increase the cost of industrial application, so as to achieve easy industrial production, wide application prospects, The effect of reducing the synthesis cost

Active Publication Date: 2019-11-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, although some progress has been made in improving the tracking resistance of addition-type liquid silicone rubber, there are still some shortcomings: insulators play the role of electrical insulation and mechanical support in the transmission network, so the tensile strength of insulators is generally affected and tear strength requirements are high, but at present, in order to make the tracking resistance of addition-type liquid silicone rubber meet certain requirements, it is necessary to add a large amount of inorganic tracking resistance agent, which will greatly reduce the performance of addition-type liquid silicone rubber. Mechanical Properties of Rubber
However, the high nitrogen content of ureidosilane will prolong the vulcanization time of addition-type liquid silicone rubber and increase its industrial application cost
In addition, ureido-containing silicones have not been fully industrialized, mainly because in industry, ureido-containing siloxanes are generally prepared by isocyanate-containing siloxanes and organic amines, and organic amines are toxic and volatile. It is very harmful to the human body and the environment. More importantly, this preparation method has very strict requirements on the purification process, because in the synthetic product, the unremoved organic amine will make the addition-type liquid silicone rubber unable to vulcanize smoothly.

Method used

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  • A kind of high-performance anti-tracking addition type liquid silicone rubber and its preparation method
  • A kind of high-performance anti-tracking addition type liquid silicone rubber and its preparation method
  • A kind of high-performance anti-tracking addition type liquid silicone rubber and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 13.2g of isopropanol, 49.4g of 3-isocyanatopropyl triethoxysilane and 0.18g of dibutyltin dilaurate into a 250mL four-neck flask equipped with a reflux condenser, mechanical stirring and a thermometer. The reaction was stirred for 3 h, and then the unreacted isopropanol was distilled off under reduced pressure to obtain 3-(isopropyl carbamate)propyltriethoxysilane (IPURPES).

[0040] Add 23.5g allyl alcohol, 43.1g 3-(isopropyl carbamate) propyltriethoxysilane and 0.66g methyl titanate into a 250mL four-necked flask equipped with a reflux condenser, mechanical stirring and a thermometer , stir evenly at room temperature, heat up to 80° C. for reflux reaction for 2 h, and finally remove low boilers by distillation under reduced pressure to obtain the product 3-(isopropyl carbamate) propyl triallyloxysilane (IPURPAS).

[0041] 100 parts by mass of vinyl silicone oil (viscosity at 25°C is 25200mPa·s, vinyl content is 0.25mol%), 40 parts by mass of fumed silica (specific...

Embodiment 2

[0044] Add 11.0 g of ethanol, 49.4 g of 3-isocyanatopropyltriethoxysilane and 0.06 g of stannous octoate into a 250 mL four-neck flask equipped with a reflux condenser, mechanical stirring and a thermometer, and stir the reaction at 30 ° C for 4 h. Then unreacted ethanol was distilled off under reduced pressure to obtain 3-(ethylcarbamate)propyltriethoxysilane (EURPES).

[0045] 7.9g allyl alcohol, 41.1g 3-(urethane) propyltriethoxysilane and 0.98g butyl titanate were added to a 250mL four-necked flask equipped with a reflux condenser, mechanical stirring and a thermometer, Stir evenly at room temperature, raise the temperature to 70° C. for reflux reaction for 3 h, and finally remove low boilers by distillation under reduced pressure to obtain the product 3-(urethane)propylallyloxydiethoxysilane (EURPAS).

[0046] The IPURPAS of 1 in the embodiment is changed into EPURPAS, and the consumption is increased to 6 mass parts, and the corresponding hydrogen-containing silicone oil...

Embodiment 3

[0048] Add 8.3g of methanol, 41.0g of 3-isocyanatopropyltrimethoxysilane and 0.03g of dibutyltin dilaurate into a 250mL four-necked flask equipped with a reflux condenser, mechanical stirring and a thermometer, and stir the reaction at 40°C for 1h , and then distilled off unreacted methanol under reduced pressure to obtain 3-(methyl carbamate)propyltrimethoxysilane (MURPMS).

[0049] 23.5g allyl alcohol, 33.3g 3-(methyl carbamate) propyltrimethoxysilane and 0.06g isopropyl titanate were added to a 250mL four-necked flask equipped with a reflux condenser, mechanical stirring and a thermometer, Stir evenly at room temperature, raise the temperature to 90° C. for reflux reaction for 6 h, and finally remove low boilers by distillation under reduced pressure to obtain the product 3-(methyl carbamate)propyltriallyloxysilane (MURPAS).

[0050] The IPURPAS of 1 in the embodiment is changed to MPURPAS, the consumption is 2 mass parts, and the corresponding hydrogen-containing silicone ...

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Abstract

The invention discloses high-performance and creepage trace-resistant addition type liquid silicone rubber and a preparation method thereof. The addition type liquid silicone rubber comprises the following components in parts by weight: 100 parts of vinyl silicone oil, 30-60 parts of white carbon black, 1-10 parts of hydrogen-containing silicone oil, 2-6 parts of amino-containing formate silane, 0.15-2 parts of a platinum catalyst and 0.004-0.03 part of 1-acetenyl-1-cyclohexanol. The addition type liquid silicone rubber has excellent creepage trace resistance and mechanical properties and has wide application prospects in the fields of electric external insulation materials and the like; and furthermore, the raw materials are easily available, and the processing process is simple and convenient for large-scale production.

Description

technical field [0001] The invention relates to the field of silicone rubber insulating materials, in particular to a high-performance tracking-resistant additive liquid silicone rubber and a preparation method thereof; belonging to the technical field of rubber insulating materials. Background technique [0002] In recent years, my country's electric power industry has developed rapidly, the operating voltage level of the power grid system has been continuously improved, and the network scale has gradually expanded. The major regional power grids have basically been integrated into a whole. accomplish. In the construction of the power grid, in order to ensure the safe transmission of electric energy, a large number of power equipment such as power transmission transformers, transformers and insulators are used. With the increasing voltage level of power transmission and transformation equipment, coupled with the aggravation of air pollution and frequent haze weather, the op...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/05C08K3/36C08K5/5465H01B3/46
CPCC08L83/04C08L2205/025C08L2312/08H01B3/465C08K3/36C08K5/5465
Inventor 曾幸荣张亚军赖学军李红强
Owner SOUTH CHINA UNIV OF TECH
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