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Preparation method of high-temperature-resistant air outlet sealing ring

A technology for sealing rings and gas outlets, which is applied in the field of preparation of high-temperature-resistant gas outlet sealing rings, which can solve the problems of macromolecule fracture degradation, thermal oxygen aging of sealing rings, and rise in melt index, and achieve the effect of slowing down thermal oxygen aging

Inactive Publication Date: 2021-08-17
龙海铭坤工贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the use of sealing rings, since some sealing rings need to be installed in a high temperature environment, and the sealing rings are easily broken and degraded due to overheating of their macromolecules, resulting in a decrease in molecular weight and an increase in melt index, resulting in Occurrence of thermo-oxidative aging of sealing ring

Method used

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  • Preparation method of high-temperature-resistant air outlet sealing ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh the following raw materials by mass: 80 nitrile rubber, 28 parts of white carbon, 5 plasticizers, 0.5 stearate, 0.3 parts of the modified anti-aging agent, 4000.2 parts of polyethylene glycol, silane coupling 0.6 parts of the agent, 3 parts of the bump, 5 parts of titanium powder and 10 light calcium carbonate.

Embodiment 2

[0024] According to the mass, the following raw materials are weighed: 100 parts of nitrile rubber, 34 copies of white carbon, 10 plasticizers, 1.6 grades of stearic acid, 1.6 parts of the modified agents, 4001.6 parts of polyethylene glycol, silane coupling 2.5 parts of the agent, 5 parts of the bump, 10 parts of titanium powder and 30 light calcium carbonate.

Embodiment 3

[0026] According to the mass, the following materials were weighed: 120 nitrile rubber, 40 copies of white carbon, 15 plasticizers, 3 stearic acid, 3 modified antimiconating agents, 4003 parts of polyethylene glycol, silane coupling 5 parts of the agent, 7 parts of the uneven rod, 15 parts of titanium powder and 50 parts of light calcium carbonate.

[0027] In the above examples, in Examples 1 to 3, a plasticizer is selected from the group consisting of dimethyl methylene dimethyl, phthalate and di-n-n-n-n-n-n-n-butyl phthalate, is preferred. The silane coupling agent is selected from any one of KH560, KH570, and KH 580, preferably KH560;

[0028] The modified anti-aging agent is prepared from phosphite, calcium stearate and antioxidant VaNOx I, and the mass ratio of phosphite, calcium stearate, and antioxidant VANOX I is 3: 1: 6, and The preparation process is: mixing phosphite, calcium stearate, and antioxidant VaNOX I, and after the Brabender plasticizer is extruded, the aging ...

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Abstract

The invention relates to the technical field of sealing ring production, in particular to a preparation method of a high-temperature-resistant air outlet sealing ring. The preparation method comprises the following steps: S1, weighing the following raw materials in parts by mass: 80-120 parts of nitrile rubber, 28-40 parts of white carbon black, 5-15 parts of a plasticizer, 0.5-3 parts of stearic acid, 0.3-3 parts of a modified anti-aging agent, 0.2-3 parts of polyethylene glycol 400, 0.6-5 parts of a silane coupling agent, 3-7 parts of attapulgite, 5-15 parts of titanium dioxide and 10-50 parts of light calcium carbonate; s2, putting the raw materials in the S1 into a mixer, and uniformly stirring and mixing at the rotating speed of 750-850r / min; and S3, preheating a mold to 80-100 DEG C, pouring the mixed raw materials into the mold, pressurizing to 35-60 MPa at the temperature of 90-100 DEG C, keeping the constant temperature for 10-60 minutes, and depressurizing and demolding after the process is finished, so as to obtain a blank. According to the invention, the high temperature resistance of the sealing ring can be effectively improved, so that the phenomenon of thermo-oxidative aging is slowed down or restrained.

Description

Technical field [0001] The present invention relates to the field of sealing rings, and more particularly to a method for preparing high temperature air outlet seals. Background technique [0002] The choice of sealing ring material is of great significance to its sealing performance and service life, and the performance of the material directly affects the performance of the seal. The existing sealing ring has an NBR nitrile rubber seal ring, an HNBR hydride oxide rubber seal ring, a SIL silicone rubber seal ring, a Viton fluorin rubber seal ring, and the like a seal ring. [0003] During the use of the sealing ring, since some seals are required to be mounted in a high temperature environment, the seal is extremely easily degraded due to heat, which greatly causes its macromolecular fracture degradation, so that its molecular weight is reduced, and the melt index rises, thereby causing The phenomenon of thermal oxygen sealing ring occurs. [0004] Therefore, we propose a prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/02C08L71/02C08K5/524C08K5/098
CPCC08L9/02C08L2201/08C08L71/02C08K5/524C08K5/098
Inventor 夏小波
Owner 龙海铭坤工贸有限公司