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Heat shrinkage-resistant sealing ring and preparation method thereof

A heat-shrinkable sealing and modification technology, applied in the field of sealing rings, can solve the problem that the heat-shrinkage resistance of the seal is difficult to meet the production requirements and so on.

Inactive Publication Date: 2018-10-19
芜湖瑞德机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, seals can be divided into NBR nitrile rubber seal rings, HNBR hydrogenated nitrile rubber seal rings, FLS fluorosilicone rubber seal rings, CR neoprene rubber seal rings, etc., although the above seals can basically meet production needs. , but in some specific environments, the heat shrinkage resistance of the seal is difficult to meet the production requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The present invention provides a kind of preparation method of heat-shrinkage sealing ring, and this preparation method comprises:

[0015] 1) Contact reaction of polyamide fiber, cyclodextrin, silane coupling agent and water, and then filter and dry the filter cake to obtain modified polyamide fiber;

[0016] 2) Perform solvothermal reaction of modified polyamide fiber, cobalt salt, alkali, urea and ethanol, then filter to take filter cake, and finally calcinate in the presence of protective gas to obtain composite polyamide fiber;

[0017] 3) Mix composite polyamide fibers, shell powder, attapulgite, barium sulfate whiskers, and rare earth oxides to prepare a modified composition;

[0018] 4) Mixing and molding styrene-butadiene rubber, EPDM rubber, fluororubber, talc powder, zinc borate, white carbon black, white oil, aluminum hydroxide, and the modified composition to obtain the heat-resistant Shrink the seal.

[0019] In step 1) of the present invention, the amou...

Embodiment 1

[0035] 1) The polyamide fiber, cyclodextrin, silane coupling agent (vinyl triethoxysilane) and water are subjected to a contact reaction in a weight ratio of 30:13:8:180 (the reaction temperature is 70°C, and the reaction time is 4h), then filter the filter cake and dry it (drying temperature is 110°C, drying time is 5h) to obtain modified polyamide fiber;

[0036] 2) Solvothermal reaction of the modified polyamide fiber, cobalt salt (cobalt nitrate hexahydrate), alkali (sodium hydroxide), urea and ethanol in a weight ratio of 50:12:40:18:200 (reaction temperature 130°C, the reaction time is 12h), then filter to take the filter cake, and finally calcine in the presence of protective gas (helium) (from 18°C ​​at 4.8°C / min to 290°C and hold for 340min, then at 1.8°C / min cooling to 230°C and holding for 1.8h, and finally cooling to 20°C naturally) to make composite polyamide fibers;

[0037] 3) Mix composite polyamide fibers, shell powder, attapulgite, barium sulfate whiskers, ...

Embodiment 2

[0039] 1) Contact reaction of polyamide fiber, cyclodextrin, silane coupling agent (vinyltrimethoxysilane) and water in a weight ratio of 30:10:5:150 (reaction temperature is 65°C, reaction time is 3h ), and then filtered to take the filter cake and dry it (drying temperature is 100°C, drying time is 6h) to obtain modified polyamide fiber;

[0040] 2) Solvothermal reaction of the modified polyamide fiber, cobalt salt (cobalt chloride hexahydrate), alkali (potassium hydroxide), urea and ethanol in a weight ratio of 50:10:30:15:150 (reaction The temperature is 120°C, the reaction time is 16h), then the filter cake is taken by filtration, and finally calcined in the presence of protective gas (nitrogen) (from 15°C at 4.5°C / min to 280°C and kept for 30min, then at 1.5°C / min cooling to 220°C and holding for 1.5h, and finally cooling to 15°C naturally) to make composite polyamide fibers;

[0041] 3) Mix composite polyamide fibers, shell powder, attapulgite, barium sulfate whiskers...

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PUM

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Abstract

The invention discloses a heat shrinkage-resistant sealing ring and a preparation method thereof. The preparation method comprises the following steps: 1) performing contact reaction on polyamide fibers, cyclodextrin, a silane coupling agent and water, then filtering, taking a filter cake and drying to prepare modified polyamide fibers; 2) performing a solvo-thermal reaction on the modified polyamide fibers, cobalt salt, alkali, urea and ethanol, then filtering, taking a filter cake and finally calcining in the presence of protective gas to prepare composite polyamide fibers; 3) mixing the composite polyamide fibers, a shell powder, attapulgite, barium sulfate whiskers and rare earth oxide to prepare a modified composition; 4) mixing styrene butadiene rubber, ethylene-propylene-diene monomer rubber, a talcum powder, zinc borate, white carbon black, white oil, aluminum hydroxide and the modified composition and forming to prepare the heat shrinkage-resistant sealing ring. The sealing ring prepared by the preparation method disclosed by the invention has excellent thermal shrinkage resistance; moreover, the preparation method has the advantages of being simple in process and easily-available in raw materials.

Description

technical field [0001] The invention relates to a sealing ring, in particular to a heat shrink-resistant sealing ring and a preparation method thereof. Background technique [0002] The seal is generally composed of a moving ring, a static ring and a sealing ring; the sealing ring plays a vital role in the sealing effect of the seal. The sealing ring generally meets the following conditions: high elasticity and resilience; appropriate mechanical strength, including expansion strength, elongation and tear strength, etc.; stable, not easy to swell in the medium, and small thermal shrinkage effect (Joule effect) ; Easy to process and shape, and can maintain precise dimensions; no corrosion of the contact surface, no pollution of the medium, etc. [0003] At present, seals can be divided into NBR nitrile rubber seal rings, HNBR hydrogenated nitrile rubber seal rings, FLS fluorosilicone rubber seal rings, CR neoprene rubber seal rings, etc., although the above seals can basicall...

Claims

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Application Information

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IPC IPC(8): C08L9/06C08L23/16C08L27/12C08L77/00C08K13/02C08K3/26C08K3/34C08K7/08C08K3/22C08K3/36C08K3/38
CPCC08K2003/221C08K2003/2227C08K2003/265C08K2003/387C08L9/06C08L2201/08C08L2205/035C08L2205/16C08L23/16C08L27/12C08L77/00C08K13/02C08K3/26C08K3/346C08K7/08C08K3/22C08K3/34C08K3/36C08K3/38
Inventor 彭常水张超
Owner 芜湖瑞德机械科技有限公司
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