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Porcelainizable halogen-free flame-retardant silicone rubber and preparation method thereof

A silicone rubber and porcelain technology, which is applied in the field of silicone rubber flame retardant materials, can solve the problem of limiting the application scope of porcelain fire retardant silicone rubber composite materials, deteriorating the processing performance and mechanical properties of silicone rubber, and damaging the processing performance and mechanical properties of silicone rubber. performance and other issues, to achieve good application prospects, improve porcelain performance, good mechanical properties and processing performance.

Active Publication Date: 2020-02-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, some progress has been made in the current research on porcelain-resistant flame-retardant silicone rubber composites, but there are still shortcomings in the existing preparation methods: low-melting-point fluxes often require a large amount (>15wt%) to be added. Satisfactory porcelain performance is achieved, which deteriorates the processability and mechanical properties of silicone rubber, and at the same time, there are problems such as deterioration of the flame retardancy of silicone rubber composites or low flame retardancy efficiency
However, adding a large amount of traditional flame retardants in combination with flux will further damage the processing performance and mechanical properties of silicone rubber.
This greatly limits the application range of porcelain-resistant flame-retardant silicone rubber composites

Method used

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  • Porcelainizable halogen-free flame-retardant silicone rubber and preparation method thereof
  • Porcelainizable halogen-free flame-retardant silicone rubber and preparation method thereof
  • Porcelainizable halogen-free flame-retardant silicone rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 93 parts by mass of methyl vinyl silicone rubber (molecular weight 620000g / mol) with 0.05mol% vinyl content, 7 parts by mass of methyl vinyl silicone rubber with 3.0mol% vinyl content (molecular weight 640000g / mol), 40 parts by mass Fumed silica (specific surface area 280m 2 / g), 6 parts by mass of hydroxyl silicone oil (hydroxyl content 8.5wt%) and 0.6 parts by mass of hydrogen-containing silicone oil (hydrogen content 1.2wt%) were kneaded in a kneader for 1.5h. Then heat to 150°C and continue kneading for 3 hours, then vacuumize and knead at 120°C for 1 hour, and cool to room temperature to obtain a silicone rubber base rubber.

[0035] The divinyltetramethyldisiloxane complex of 40 mass parts fluorophlogopite (3000 orders), chloroplatinic acid (addition amount is by the quality of platinum in methylvinyl silicone rubber) The concentration is 15ppm), 2 parts by mass of γ-aminopropyltriethoxysilane and 2 parts by mass of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane are ...

Embodiment 2

[0037]98 parts by mass of methyl vinyl silicone rubber (molecular weight 700000g / mol) with 0.10mol% vinyl content, 2 parts by mass of methyl vinyl silicone rubber with 4.0mol% vinyl content (molecular weight 500000g / mol), 50 parts by mass Fumed silica (specific surface area 200m 2 / g), 8 parts by mass of hydroxyl silicone oil (hydroxyl content 5wt%) and 0.6 parts by mass of hydrogen-containing silicone oil (hydrogen content 1.2wt%) were kneaded in a kneader for 2h. Then heat to 160°C and continue kneading for 2h, then vacuumize and knead at 130°C for 0.5h, and cool to room temperature to obtain a silicone rubber base rubber.

[0038] Adopt two-roll mill to mix 30 mass parts of fluorophlogopite (3000 orders), tetrahydrofuran solution of chloroplatinic acid (the addition amount is counted as 15ppm according to the mass concentration of platinum in methyl vinyl silicone rubber), 2 mass parts of N- Phenyl-3-aminopropyltrimethoxysilane and 1.5 parts by mass of 2,5-dimethyl-2,5-di-...

Embodiment 3

[0040] 90 parts by mass of methyl vinyl silicone rubber (molecular weight 620000g / mol) with 0.05mol% vinyl content, 10 parts by mass of methyl vinyl silicone rubber with 2.0mol% vinyl content (molecular weight 640000g / mol), 30 parts by mass Fumed silica (specific surface area 300m 2 / g), 4 parts by mass of hydroxyl silicone oil (hydroxyl content 5wt%) and 0.6 parts by mass of hydrogen-containing silicone oil (hydrogen content 1.2wt%) were kneaded in a kneader for 1 h. Then heat to 140°C and continue mixing for 4 hours, then vacuumize and mix at 120°C for 1.5 hours, and cool to room temperature to obtain a silicone rubber base rubber.

[0041] Adopt two-roll mill to mix 50 mass parts of fluorophlogopite (1250 orders), the isopropanol solution of chloroplatinic acid (the addition amount is counted as 10ppm according to the mass concentration of platinum in methyl vinyl silicone rubber), 1 mass part Add γ-piperazinylpropylmethyldimethoxysilane and 2.5 parts by mass of 2,5-dimeth...

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Abstract

The invention discloses a porcelainizable halogen-free flame-retardant silicone rubber and a preparation method thereof, wherein the porcelainizable halogen-free flame-retardant silicone rubber is prepared from the following raw materials: 100 parts of a methyl vinyl silicone rubber, 30-50 parts of fumed silica, 30-50 parts of fluorophlogopite, 10-30 ppm of a platinum compound, 1-3 parts of nitrogen-containing silane, 4-8 parts of hydroxyl silicone oil, 0.4-0.8 part of hydrogen-containing silicone oil and 1.5-2.5 parts of 2,5-dimethyl-2,5-di-tert-butyl hexane peroxide. The preparation method comprises: uniformly mixing a methyl vinyl silicone rubber, fumed silica, hydroxyl silicone oil and hydrogen-containing silicone oil in a kneading machine to obtain a silicone rubber base rubber; and uniformly mixing the base rubber and other components in the formula by using a double-roller open mill, and vulcanizing. According to the invention, the prepared silicone rubber has excellent flame retardant property and good mechanical property, does not contain halogen, and can be converted into a ceramic structure with excellent mechanical properties in a high-temperature environment.

Description

technical field [0001] The invention relates to the technical field of silicone rubber flame-retardant materials, in particular to a porcelain-able halogen-free flame-retardant silicone rubber, and also relates to a preparation method of the porcelain-able halogen-free flame-retardant silicone rubber. [0002] technical background [0003] Porcelainizable flame retardant silicone rubber composite materials have excellent porcelain properties and good flame retardant properties, and have important applications in the fields of construction engineering, aerospace, and electronics. When the vitrified flame-retardant silicone rubber composite material is used as the insulating material for the outer covering of wires and cables, it can form an inorganic ceramic structure in a fire, effectively prevent the spread of flames, protect the internal materials from high temperature damage, ensure the normal operation of the line, and avoid The occurrence of secondary injuries such as el...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/04C08L83/05C08K13/04C08K7/26C08K3/34
CPCC08K2201/005C08K2201/006C08L83/04C08L2201/02C08L2201/22C08L2205/025C08L2205/035C08K13/04C08K7/26C08K3/34
Inventor 曾幸荣王焰林赖学军李红强
Owner SOUTH CHINA UNIV OF TECH
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