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Chloroprene rubber composition for ultra low temperature sealing arrangement

A technology of neoprene and sealing devices, applied in other chemical processes, chemical instruments and methods, etc., to achieve good compatibility and good thermal bonding performance

Active Publication Date: 2009-04-22
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no relevant reports at home and abroad on the sealing rubber of ultra-low temperature devices that can be used at a temperature of -196 °C.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Formula 1: 120 parts of neoprene, 25 parts of carbon black, 5 parts of ZnO and 0.5 parts of thiourea accelerator;

[0017] Mixing process: add 120 parts of chloroprene rubber with a Cl- content of 30%, the roller distance of the rubber mixer is 1.5 mm, and mix for 5 to 8 minutes; add 5 parts of ZnO, and the roller distance of the rubber mixer is 3 ~5mm, kneading for 3~5min; adding 25 parts of carbon black with a particle size of 0.5~50 microns, the roller distance of the rubber kneader is 4~5mm, kneading for 5~8min; adding 0.5 parts of thiourea accelerator, The roller distance of the rubber mixer is 3-5mm, and the mixing time is 1-2 minutes; the rubber mixer roller distance is 4-5mm, and the mixing time is 3-5 minutes; The pitch is 3-5mm, and the mixing is 3-5 minutes; the thin pass is 4 times, the roller distance of the rubber mixer is 3-5mm, and the mixing is 3-5 minutes; the rolling is 10 times, and the roller distance of the rubber mixer is 3-5 minutes. 5mm, kneadi...

Embodiment 2

[0023] Formula 2: 110 parts of neoprene, 40 parts of carbon black, 7 parts of ZnO and 0.8 parts of thiourea accelerator;

[0024] The mixing process is the same as in Example 1.

[0025] The performance index of formulation 2 at room temperature and -196°C is shown in Table 3:

[0026] table 3:

[0027] serial number mechanical properties Performance testing method 1 Tensile strength σt(MPa) 16 GB528-82 2 Elongation at break εt(%) 200 GB528-82 3 Permanent deformation at break (%) 7 GB528-82

[0028] 4 Hardness (Shore) 68 GB531-83 5 -196℃Et(GPa) 6 GB / T2568-1995

[0029] Comparing Table 1 and Table 3, each performance index of formula 2 all meets the requirements.

Embodiment 3

[0031] Formula 3: 100 parts of neoprene, 50 parts of carbon black, 9 parts of ZnO and 1 part of thiourea accelerator;

[0032] The mixing process is the same as in Example 1.

[0033] The performance indicators of formula 3 at room temperature and -196°C are shown in Table 4:

[0034] Table 4:

[0035] serial number mechanical properties Performance testing method 1 Tensile strength σt(MPa) 15 GB528-82 2 Elongation at break εt(%) 160 GB528-82 3 Permanent deformation at break (%) 8 GB528-82 4 Hardness (Shore) 75 GB531-83 5 -196℃Et(GPa) 5.8 GB / T 2568-1995 6 -196℃σt(MPa) 85 GB / T 2568-1995

[0036] Comparing Table 1 and Table 4, each performance index of formula 3 all meets the requirements.

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Abstract

The invention provides a neoprene composition for an ultra low temperature sealing device, wherein neoprene, carbon black, ZnO and accelerant are evenly mixed and placed in a rubber mixing machine for mixing. The neoprene composition has good process performance and metal heat bonding performance; and at an ultra low temperature of 196 DEG C below zero, the neoprene composition has good medium compatibility and reliable sealing performance, and the pressure resisting range reaches between 0.1 below zero to 35MPa.

Description

technical field [0001] The invention relates to a chloroprene rubber composition used for an ultra-low temperature sealing device, belonging to the field of ultra-low temperature rubber. Background technique [0002] Mechanical devices used in aerospace, chemical and other industries need to work under ultra-low temperature and high pressure conditions. For example, the fuel tanks, conduits, valves and other structures on the launch vehicle that are in direct contact with liquid hydrogen and liquid oxygen all need to work at ultra-low temperatures. Tanks, conduits, valves, etc. are connected in various forms, and reliable ultra-low temperature sealing materials are the key to ensure the safety and normal operation of the system. The performance indicators of ultra-low temperature sealing materials at room temperature and -196°C are shown in Table 1: [0003] Table 1 [0004] serial number mechanical properties Performance testing method 1 Tensile stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L11/00C08K3/04C08K3/22C08K5/405C09K3/10
Inventor 牛宝林陈风波王立峰田新吴福迪
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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