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Low-density halogen-free flame retardant monocomponent titanate catalyzed room-temperature vulcanized silicone rubber and preparation method thereof

A technology of vulcanizing silicone rubber and catalyzing room temperature. It is applied in the direction of chemical instruments and methods, and other chemical processes. It can solve problems such as high viscosity, phase separation between filler and base rubber, and poor processing performance, so as to achieve low density and improve compatibility. , the effect of a wide range of viscosity adjustable

Active Publication Date: 2014-06-04
TONSAN ADHESIVES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a high filling amount of flame retardant filler is required to achieve halogen-free flame retardancy, which will lead to adverse effects such as high viscosity, poor processability, phase separation of filler and base rubber, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Preparation of modified α, ω-dihydroxy polydimethylsiloxane

[0055] in N 2 Under protection, 1000 parts of 1500 mPa·s α, ω-dihydroxy polydimethylsiloxane, 100 parts of tetramethoxysilane, 5 parts of capping catalyst calcium carbonate (or zinc carbonate, zinc oxide) were added to the reaction In the container, stir and react at 130°C for 6h (according to the difference in the capping reaction catalyst and the amount of tetramethoxysilane added, those skilled in the art can properly adjust the reaction temperature and time), and then at 100°C, Under the condition of vacuum degree>-0.09MPa, the low boilers and excess tetramethoxysilane are removed to obtain the modified α,ω-dihydroxy polydimethylsiloxane with the structural formula I.

Embodiment 2

[0057] Preparation of Modified α-Hydroxy-ω-Methyl Dimethicone

[0058] in N 2 Under protection, 500 parts of 50 mPa·s α-hydroxy-ω-methyl polydimethylsiloxane, 100 parts of tetramethoxysilane, 5 parts of calcium carbonate (or zinc carbonate, zinc oxide) of the capping catalyst Add it into the reaction container, and stir the reaction at 130°C for 6h (according to the difference of the capping reaction catalyst and the amount of tetramethoxysilane added, those skilled in the art can properly adjust the reaction temperature and time), and then at 100 °C, vacuum >-0.09MPa, low boilers and excess tetramethoxysilane are removed to obtain modified α-hydroxy-ω-methyl polydimethylsiloxane with structural formula II.

Embodiment 3

[0060] Add 200 parts of modified α-hydroxy-ω-methylpolydimethylsiloxane, 150 parts of aluminum hydroxide, 10 parts of acetylene carbon black, and 20 parts of gas-phase titanium dioxide into the high-speed dispersion mixer, at a vacuum degree >-0.09 Mix under the condition of MPa, and then break the vacuum with nitrogen, under the protection of nitrogen, stir and react at 120°C for 2h, then remove the low boilers at this temperature and vacuum >-0.09MPa and cool to room temperature, nitrogen Break the vacuum, add 1000 parts of the above-mentioned modified α, ω-dihydroxy polydimethylsiloxane, and stir for 10 minutes under the condition of vacuum degree >-0.09MPa; then add 40 parts of fumed white carbon black, Stir for 15min under the condition of -0.09MPa; finally add 30 parts of methyltrimethoxysilane, 20 parts of ethyl acetoacetate chelate of isopropyl titanate, silane coupling agent (aminopropyltriethoxysilane and ring 10 parts of oxypropoxypropyl trimethoxysilane according t...

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Abstract

The invention relates to a low-density halogen-free flame retardant monocomponent titanate catalyzed room-temperature vulcanized silicone rubber and preparation method thereof, the silicone rubber is prepared from the following components in parts by mass: 100 parts of modified alpha, omega-dihydroxy polydimethyl siloxane, 10-40 parts of modified alpha-hydroxy-omega-methyl polydimethyl siloxane, 10-20 parts of inorganic function filler, 3-10 parts of fumed silica, 0.5-2 parts of carbon black, 1-5 parts of vapor phase method titanium dioxide, 1-15 parts of a crosslinking agent, 1-10 parts of a titanate catalyst and 0-5 parts of a silane coupling agent. The processing property and storage property of the titanate catalyst system are improved, the silicone rubber with low viscosity can be prepared, the compatibility, color uniformity and storage stability and electrical property of the filler and the silicone rubber system are improved, the UL94-V0 level flame retardance is improved, the rubber cannot release any toxic gas in combustion; the prepared silicone rubber has lower density, wider viscosity adjustable range, and lower cost, the contact material cannot be corroded, and the demand on electronics industry is satisfied.

Description

technical field [0001] The invention relates to the field of polymer sealing materials, in particular to a halogen-free flame-retardant one-component titanate catalyzed room temperature vulcanized silicone rubber and a preparation method thereof. Background technique [0002] The vulcanization reaction of one-component RTV silicone rubber is to vulcanize into an elastomer by reacting with moisture in the air. With the different crosslinking agents, it can be divided into many varieties such as deacidification type, deoxime type, dealcoholization type, deamination type, deamidation type and acetone removal type. According to the different fillers and additives added, it has different density, viscosity, fluidity and thixotropy, and exhibits different special properties such as heat resistance, heat conduction, ablation resistance, flame retardancy, conductivity, etc., so it can be used in different industries. . [0003] Among them, in the electronic and electrical industry...

Claims

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Application Information

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IPC IPC(8): C08L83/06C08K13/06C08K9/06C08K3/36C08K3/04C08K3/22C08K3/26C08K3/38C08K3/02C08K3/32C08G77/38C09K3/10
Inventor 肖明苏丹王德波郑妙生
Owner TONSAN ADHESIVES INC
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