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Aviation hollow perforated silicone rubber sealing element molding process

A molding process and technology of silicone rubber, which is applied in the field of molding technology of hollow open-hole silicone rubber seals for aviation, can solve problems such as difficult demoulding, damage to the sealing structure, and easy bubbles on the product surface, so as to ensure the sealing effect and stable combination , easy demoulding effect

Inactive Publication Date: 2020-09-15
HUNAN MASTER SEALING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a molding process for hollow open-cell silicone rubber seals for aviation, which is suitable for high-temperature vulcanization, and does not cause brittle cracks, and can make the rubber The intermolecular combination inside the seal is more stable to ensure its sealing effect, and the advantages of easy demoulding and high production efficiency solve the problem that there are easy bubbles on the surface of the rubber part, which damages the sealing structure, and the connection between the internal molecules is not stable enough. , leading to the problem that it is not suitable for vulcanization at elevated temperature, the product is brittle, difficult to demould, and affects the sealing effect of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 30 parts of silicone rubber raw rubber, 15 parts of hydrogenated nitrile rubber raw rubber, 4 parts of filling reinforcing agent, 2 parts of polyfluoroisopropyl ether oil and 5 parts of organic peroxide into the mixer for mixing, and Adjust the temperature to 230°C and stir for 30 minutes to make a liquid mixture, then continue to add 5 parts of processing aids, 10 parts of vulcanizing agent and 1 part of accelerator, continue to stir for 40 minutes, and continue to reduce the temperature to 50°C during the stirring process , and cooled for 2 hours to obtain mixed colloids; the prepared mixed colloids were added to the internal mixer for mastication, and the duration was 10 minutes, and then 15 parts of carbon black, 20 parts of paraffin oil and 15 parts of light calcium were added to continue mixing The mixing time is 40min and the temperature is 90°C. After the mixing is completed, it is left to cool for 1h, and then it is added to the open mixer for mixing. After ...

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PUM

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Abstract

The invention relates to the technical field of silicone rubber sealing elements, and discloses an aviation hollow perforated silicone rubber sealing element molding process. The process comprises thesteps of 1, preparing materials, 2, carrying out rubber mixing, 3, carrying out compression molding, 4, carrying out vulcanization treatment, and other steps. According to the aviation hollow perforated silicone rubber sealing element molding process, the silicone rubber raw rubber, the hydrogenated nitrile rubber raw rubber, the filling reinforcing agent, the fluorinated isopropyl ether oil andthe organic peroxide are added into a mixer to be mixed, so that the hardness of the obtained rubber sealing element is lower than 30 HA, meanwhile, wax is not sprayed on the rubber sealing element, therefore, the rubber sealing element is suitable for high-temperature vulcanization, and brittle rupture is avoided, in the compression molding process, intermolecular bonding inside the rubber sealing element can be more stable in an oscillation mode, sealing effect of the rubber sealing element is guaranteed, demolding is easy, and production efficiency is high.

Description

technical field [0001] The invention relates to the technical field of silicone rubber seals, in particular to a molding process for hollow open-hole silicone rubber seals for aviation. Background technique [0002] Due to the low air pressure of the aircraft at high altitude, it is necessary to pressurize the aircraft to ensure the normal activities of personnel, resulting in a pressure difference between the inside and outside of the aircraft, and the seals are compressed during use to generate contact stress. When the contact stress is greater than the inside and outside of the aircraft In the worst case, the seal prevents air leakage and achieves a tight seal. There are many cross-sectional structures of aircraft seals, and the most commonly used structure is hollow tube. [0003] During the production and molding process of the seals in the prior art, the surface of the rubber product is prone to air bubbles, which damages the sealing structure, and the connection betw...

Claims

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Application Information

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IPC IPC(8): B29C43/02B29C43/36B29C35/02B29B7/00B29K19/00B29K83/00B29L31/26
CPCB29B7/005B29C35/02B29C43/003B29C43/02B29C43/361B29K2019/00B29K2083/005B29L2031/265
Inventor 饶文昌盛昌莫应强盛建军杨建辉张霞林彭瀚
Owner HUNAN MASTER SEALING