Modified nano composite silicon rubber seal ring and preparation thereof

A nano-composite and sealing ring technology, applied in the field of sealing rings, can solve the problems of reducing the mechanical properties of silicone sealing rings, affecting the application of sealing materials, and reducing sealing performance, so as to achieve the effects of increasing air tightness, increasing toughness and prolonging service life

Active Publication Date: 2017-01-11
GUANGDONG NANOLUTION SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with sealing rings such as polysulfide rubber and fluororubber, the silicone sealing ring itself has high water vapor and gas permeability, which reduces the sealing performance, and decays and ages over time during use. Silicone rubber Gradually loses elasticity, reduces the mechanical properties of the silicone sealing ring, and at the same time the reduction of its air tightness is further amplified, resulting in air leakage, water leakage, oil leakage and other adverse phenomena, which affects its application as a sealing material

Method used

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  • Modified nano composite silicon rubber seal ring and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1) modification of nano-additives: select 5-10 layers of white graphene to soak in 0.1% oleylamine aqueous solution for 24 hours, obtain modified white graphene additives after centrifugation and vacuum drying;

[0030] Step 2) raw rubber mixing: Weigh 100 parts of methyl vinyl silicone rubber with a vinyl molar percentage of 0.25%, 15 parts of hydroxyl-terminated polydimethylsiloxane, and 3 parts of silane coupling agent in parts by weight KH-570, 0.1 part of modified white graphene additive and 30 parts of carbon black prepared in step 1) were added to the internal mixer for mixing in turn, the mixing temperature was 90°C, and the mixing time was 50 minutes; then passed through the twin-screw The extruder is extruded at a temperature of 120°C to obtain a raw rubber compound;

[0031] Step 3) Vulcanization molding: Weigh 100 parts by weight of the raw rubber compound obtained in step 2) and 3 parts of di-tert-butyl peroxide, mix and disperse evenly at room tempera...

Embodiment 2

[0033] Step 1) modification of nano-additives: select 5-10 layers of white graphene to soak in 0.1% oleylamine aqueous solution for 24 hours, obtain modified white graphene additives after centrifugation and vacuum drying;

[0034] Step 2) raw rubber mixing: weigh 100 parts by weight of methyl vinyl silicone rubber with a vinyl molar percentage of 0.25%, 8 parts of hydroxyl-terminated polydimethylsiloxane, and 1 part of silane coupling agent KH-570, 0.5 parts of modified white graphene additives and 20 parts of carbon black prepared in step 1) were successively added to the internal mixer for mixing, the mixing temperature was 60°C, and the mixing time was 20min; The screw extruder is extruded at a temperature of 180°C to obtain raw rubber compound;

[0035] Step 3) Vulcanization molding: Weigh 100 parts by weight of the raw rubber compound obtained in step 2) and 1.5 parts of di-tert-butyl peroxide. In the mold, the modified nano-composite silica gel sealing ring is obtained...

Embodiment 3

[0037] Step 1) Modification of nano-additives: disperse graphene with 5-10 layers in a concentration of 0.3mg / ml polyvinylpyrrolidone aqueous solution for 10 hours, and obtain modified graphene additives after centrifugation and vacuum drying;

[0038] Step 2) raw rubber mixing: Weigh 100 parts of methyl vinyl silicone rubber with a vinyl molar percentage of 0.25%, 15 parts of hydroxyl-terminated polydimethylsiloxane, and 3 parts of silane coupling agent in parts by weight KH-570, 0.1 parts of modified graphene additives and 30 parts of carbon black prepared in step 1) were added to the internal mixer and mixed in sequence. The mixing temperature was 90°C and the mixing time was 50 minutes; then passed through twin-screw extrusion The extruder is extruded at a temperature of 120°C to obtain a raw rubber compound;

[0039] Step 3) Vulcanization molding: Weigh 100 parts by weight of the raw rubber compound obtained in step 2) and 3 parts of di-tert-butyl peroxide, mix and disper...

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Abstract

The invention relates to the technical field of seal rings, and particularly discloses a modified nano composite silicon rubber seal ring which comprises unvulcanized compounded rubber and a vulcanizing agent in a weight ratio of 100:(0.5-10). The unvulcanized compounded rubber comprises the following components in parts by weight: 70-100 parts of methylvinyl silicone rubber, 1-20 parts of plasticizer, 0.01-10 parts of modified nano additive, 10-50 parts of reinforcing filler and 0.5-5 parts of coupling agent. The modified nano additive is one of modified white graphene, modified graphene and graphene oxide. Small amounts of nano modified particles added into the composite silicon rubber seal ring are beneficial to increasing the sealing property and mechanical strength, but other properties are not influenced. The preparation method effectively improves the problems of water vapor, gas permeability degradation and mechanical property degradation caused by aging of the silicon rubber seal ring in the long-term use process, greatly prolongs the service life of the seal material, and has high application value.

Description

technical field [0001] The invention relates to the technical field of sealing rings, in particular to a modified nano-composite silica gel sealing ring and its preparation. Background technique [0002] As a key connection between sealing parts and parts, silicone sealing rings are widely used in aerospace, medical, automobile, household appliances and other fields because of their excellent heat resistance, low temperature elasticity and oxidation resistance. Compared with sealing rings such as polysulfide rubber and fluororubber, the silicone sealing ring itself has high water vapor and gas permeability, which reduces the sealing performance, and decays and ages over time during use. Silicone rubber Gradually loses elasticity, reduces the mechanical properties of the silicone sealing ring, and at the same time the reduction of its air tightness is further amplified, resulting in air leakage, water leakage, oil leakage and other adverse phenomena, which affects its applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/06C08K13/06C08K13/02C08K7/00C08K9/04C08K3/04C08K5/5419
CPCC08K3/04C08K5/5419C08K7/00C08K9/04C08K13/02C08K13/06C08L83/06C08L83/04C08K2201/011C08K2201/014C08L2201/08C08L2205/02C08K9/08C08K13/04
Inventor 段曦东李晓丰毛志浩
Owner GUANGDONG NANOLUTION SCI & TECH CO LTD
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