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Flame-ablation-resistant silicone rubber heat-shrinkable material, preparation method thereof and silicone rubber heat-shrinkable tube

A silicone rubber, ablation-resistant technology, applied in the field of materials, can solve problems such as tensile fracture, inconvenient pipe body piercing and connection, and large inner layer friction

Active Publication Date: 2022-01-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]At present, the refractory casing on the market is compounded by coating a layer of organic silica gel on the outer surface of the alkali-free glass fiber sleeve and then undergoing high-temperature vulcanization treatment. The layer is thin, easy to wear, not resistant to high pressure, not resistant to acid and alkali, poor solvent resistance, poor sealing performance, the inner layer is a glass fiber braided layer, the friction is large, the overall tensile strength is low, and tensile fracture is prone to occur
When in use, metal clamps are mainly used for fixing. During the installation process, the inner friction force is large, it is inconvenient to connect the pipe body, and it is easy to block the pipe, and the surface silicone layer is easy to wear, losing moisture, oil and water. And anti-aging performance, and this kind of machinery is fixed in a long-term vibration environment, the fastness is poor, the clamp and the sleeve are severely worn, resulting in the exposed packaged objects and reduced protection

Method used

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  • Flame-ablation-resistant silicone rubber heat-shrinkable material, preparation method thereof and silicone rubber heat-shrinkable tube
  • Flame-ablation-resistant silicone rubber heat-shrinkable material, preparation method thereof and silicone rubber heat-shrinkable tube
  • Flame-ablation-resistant silicone rubber heat-shrinkable material, preparation method thereof and silicone rubber heat-shrinkable tube

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preparation example Construction

[0054] The present invention also provides a method for preparing the flame ablation-resistant silicone rubber heat-shrinkable material described in the above technical solution, comprising the following steps:

[0055] a) 90-100 parts by mass of silicone rubber, 10-40 parts by mass of thermoplastic resin, 40-85 parts by mass of anti-ablation filler, 10-40 parts by mass of reinforcing filler, 1-5 parts by mass of heat-resistant mixing fillers, 1-5 parts by mass of a structure control agent, 0.1-1 parts by mass of an antioxidant, and 2-6 parts by mass of a crosslinking aid to obtain a rubber-plastic compound;

[0056] b) Preforming the rubber-plastic compounded rubber material to obtain a silicone rubber preform;

[0057] c) subjecting the silicone rubber preform to cross-linking modification treatment to obtain a vulcanized silicone rubber material;

[0058] d) expanding and shaping the vulcanized silicone material to obtain a flame-ablation-resistant silicone rubber heat-shr...

Embodiment 1

[0072] Modification of ablation-resistant filler:

[0073] Due to the weak interfacial bonding force and incompatibility between the inorganic filler and the silicone rubber matrix, it is easy to agglomerate in the system when a high content is introduced, resulting in poor mechanical properties, low expansion yield, and unstable flame ablation resistance. In order to further improve The dispersion of ablation-resistant fillers in the silicone rubber system requires organosiliconization on the surface; at the same time, due to wollastonite, low-melting glass powder, ZrO 2 Inorganic fillers such as -OH have -OH on the surface, which is easy to react with the hydrolyzed silane coupling agent. The matrix used in the subsequent preparation of heat shrinkable tubes is addition-type silicone rubber, and the surface-modified coupling agent is mainly vinyl; therefore, the selected The specific modification process is as follows:

[0074] (1) Add 100g wollastonite (ultra-fine acicular...

Embodiment 2

[0079] A flame-ablation-resistant silicone rubber heat-shrinkable tube, its specific formula is as follows in parts by mass: 90 parts of methyl vinyl silicone rubber, 10 parts of methyl vinyl phenyl silicone rubber, 25 parts of ethylene-vinyl acetate copolymer Parts, modified wollastonite 50 parts, modified ZrO 2 10 parts, 5 parts of modified low-melting glass powder, 30 parts of fumed silica modified by hexamethyldisilazane, CeO 2 (Particle size 30-50nm) 2 parts, 3.5 parts of hydroxy silicone oil, 0.3 parts of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, trimethylolpropane trimethyl 4 parts of acrylic acid ester; wherein, the methyl vinyl silicone rubber is a methyl-terminated structure, the vinyl content is 0.05 to 0.13 wt%, and the number average molecular weight is 60 to 650,000; the methyl vinyl phenyl silicone rubber The rubber is a methyl-terminated structure, with a vinyl content of 0.05-0.13 wt%, a phenyl content of 5-8 wt%, and...

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Abstract

The invention belongs to the field of materials, and particularly relates to a flame-ablation-resistant silicone rubber heat-shrinkable material, a preparation method thereof and a silicone rubber heat-shrinkable tube. The silicone rubber heat-shrinkable material provided by the invention is prepared from raw materials through mixing, pre-forming, cross-linking modification and expansion shaping; and the raw materials comprise the following components in parts by mass: 90-100 parts of silicone rubber, 10-40 parts of thermoplastic resin, 40-85 parts of ablation-resistant filler, 10-40 parts of reinforcing filler, 1-5 parts of heat-resistant filler, 1-5 parts of a structure control agent, 0.1-1 part of an antioxidant and 2-6 parts of a cross-linking aid. The silicone rubber heat-shrinkable material provided by the invention has good mechanical properties and flame ablation resistance, can effectively isolate flame burning and thermal radiation, is simple in construction process, can tightly bind a protected sample after being heated, and is not easy to fall off.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a flame-ablation-resistant silicone rubber heat-shrinkable material, a preparation method thereof, and a silicone rubber heat-shrinkable tube. Background technique [0002] Refractory casing is mainly used in the high temperature environment of steel, metallurgy, shipbuilding, aerospace, automobile and other industries to provide external protection for cables, fluid pipelines, rolling mill cables, oil pipes and hydraulic system pipelines. Taking the use in the aircraft engine compartment as an example, since the system is in a continuous high-temperature environment, each component used has fire performance requirements, so it is necessary to install a fire-resistant casing outside the pipeline to improve fire performance. [0003] At present, the refractory casing on the market is made by coating a layer of organic silica gel on the outer surface of the alkali-free glass fi...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L23/06C08L23/08C08L27/06C08K9/06C08K7/26C08K3/22C08K7/24C08K3/34C08K3/40C08K7/10
CPCC08L83/04C08L2201/02C08L2203/18C08L2201/08C08K2003/2272C08K2003/2213C08K2003/221C08K2003/2227C08K2003/2244C08K2201/011C08L23/06C08L23/0853C08L23/0815C08L27/06C08K9/06C08K7/26C08K3/22C08K7/24C08K3/34C08K3/40C08K7/10
Inventor 冉祥海钱景付超聂伟王春博高一星
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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