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Silicone rubber material for flexible joint and preparation method of silicone rubber material

A flexible joint and silicone rubber technology, applied in the field of silicone rubber materials for flexible joints and their preparation, can solve the problem that the mechanical tensile strength is only 1MPa ~ 2MPa, lower than 25 degrees, and some even have only ten degrees, which cannot be used. life and other issues, to achieve the effect of improving mechanical strength, low price, and improving high and low temperature performance

Active Publication Date: 2016-04-20
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the Shore hardness of silicone rubber materials for flexible joints is generally 35 degrees, such as Li Shenghua [1] et al. Silicone rubber for flexible joints can no longer meet the technical requirements for low hardness of silicone rubber for small flexible joints
Some room temperature vulcanized silicone rubber materials, silicone rubber putty for sealing and other rubber materials have a Shore hardness lower than 25 degrees, and some even have a dozen degrees, but their mechanical tensile strength is only 1MPa-2MPa, or lower than 1MPa
As the hardness of silicone rubber decreases, especially when the hardness is lower than 25 degrees Shore, its mechanical properties decrease more and it cannot be used or its service life is very short, which is very uneconomical.

Method used

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  • Silicone rubber material for flexible joint and preparation method of silicone rubber material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Formula composition: 100 parts of phenyl silicone rubber, 30 parts of ethyl silicone rubber, 50 parts of fumed silica A-38050, 10 parts of hexamethylcyclotrisilazane, 10 parts of long-chain alkyl silicone oil, polyvinyl silicone oil 2 parts, 0.5 parts of chrome green, 2,5-dimethyl-2,5-di-tert-butylperoxyhexane, 0.6. According to the proportion and the above-mentioned preparation process, the test pieces satisfying various performance tests in the table were prepared. Then measure the physical and mechanical properties of the silicone rubber vulcanizate samples according to GB / T528-2009, GB / T531.1-2008, the results are shown in Table 1.

Embodiment 2

[0052]Formula composition: 100 parts of phenyl silicone rubber, 15 parts of ethyl silicone rubber, 20 parts of fumed silica A-38020, 6 parts of hexamethylcyclotrisilazane, 3 parts of long-chain alkyl silicone oil, polyvinyl silicone oil 6 parts, 1 part of chrome green, 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane. According to the proportion and the above-mentioned preparation process, the test pieces satisfying various performance tests in the table were prepared. Then measure the physical and mechanical properties of the silicone rubber vulcanizate samples according to GB / T528-2009, GB / T531.1-2008, the results are shown in Table 1.

Embodiment 3

[0054] Formula composition: 100 parts of phenyl silicone rubber, 20 parts of ethyl silicone rubber, 40 parts of fumed silica A-20040, 10 parts of hydroxyl silicone oil, 8 parts of long chain alkyl silicone oil, 3 parts of polyvinyl silicone oil, 5 parts of iron red Parts, dicumyl peroxide, 1 part. According to the proportion and the above-mentioned preparation process, the test pieces satisfying various performance tests in the table were prepared. Then measure the physical and mechanical properties of the silicone rubber vulcanizate samples according to GB / T528-2009, GB / T531.1-2008, the results are shown in Table 1.

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Abstract

The invention belongs to the technical field of special functional rubber materials and productions thereof and relates to a silicone rubber material for a flexible joint and a preparation method of the silicone rubber material. The silicone rubber material is prepared from substances as follows: phenyl siloxane rubber, ethyl silicone rubber, white carbon black, a structure control agent, a low-modulus additive, an assistant crosslinker, a colorant and a peroxide crosslinking initiator through mixing. The substances are weighed in a ratio and uniformly mixed, and a low-hardness and high-strength silicone rubber material for the flexible joint is prepared; the low-hardness and high-strength silicone rubber material for the flexible joint is put in a die cavity, one-stage vulcanization is performed on a plate vulcanizing machine, or the silicone rubber material is extruded and vulcanized through a specially-made opening die by means of a silicone rubber extruder, and finally, a product subjected to one-stage vulcanization is subjected to two-stage vulcanization in an electro-thermal blowing dry box. The hardness (Shore A) of the prepared silicone rubber is smaller than 25 HA, the strength is higher than 6.5 Mpa, the preparation method is simple, the cost is lower, and the economical performance is good.

Description

technical field [0001] The invention belongs to the technical field of special functional rubber materials and their production, and relates to a silicone rubber material for flexible joints and a preparation method thereof. Background technique [0002] The flexible nozzle composed of movable body, fixed body and flexible joint is an important way of thrust vector control. The vehicle based on the flexible nozzle engine is expected to be used as a booster of a space transportation tool in important aerospace fields such as manned spaceflight, space station material transportation, interstellar transportation, moon landing transportation, and satellite carrying. The vehicle based on the flexible nozzle engine is expected to be applied to large strategic missiles, small air defense, anti-missile, submarine-launched missiles, etc. The flexible joint is the core component of the flexible nozzle. It is composed of several concentric ring-shaped spherical rubber layers, reinforc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/04C08K13/02C08K3/36C08K5/14
CPCC08K2201/006C08L83/04C08L2205/025C08L2205/035C08K13/02C08K3/36C08K5/14C08K2003/2272C08L83/06C08K3/04
Inventor 涂春潮黄艳华王珊郝敏任玉柱
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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