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Method for vulcanizing nitrile elastomer

A technology of elastomers and nitriles, applied in the field of vulcanization of nitrile elastomers, can solve problems such as scarcity of technology, and achieve the effect of simple vulcanization system and non-toxic crosslinking agent

Inactive Publication Date: 2011-07-27
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, technology for economical, non-toxic vulcanized nitrile elastomers is still extremely scarce

Method used

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  • Method for vulcanizing nitrile elastomer
  • Method for vulcanizing nitrile elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 100 kg of nitrile rubber resin and 55 kg of tartaric acid into the open mill at one time, and mix evenly at 45 ° C to obtain a compound rubber; then quickly send the compound rubber to a flat vulcanizing machine at a temperature of 180 ° C for vulcanization. After 60 min, the material was discharged and cooled to obtain a vulcanized nitrile elastomer. The vulcanization characteristic parameters tested according to the national standard: positive vulcanization time t 90 =20.83min, minimum torque M L =0.82dN·m, the maximum torque M H =9.60 dN·m, torque increment △M=8.78 dN·m.

Embodiment 2

[0020] Put 100 kg of nitrile rubber resin and 45 kg of malic acid into the internal mixer at one time, and mix evenly at 20°C to obtain a compound rubber; then quickly send the compound rubber into a flat vulcanizing machine at a temperature of 200°C for vulcanization , After 30 minutes, the material is discharged, cooled, and the vulcanized nitrile elastomer is obtained. The vulcanization characteristic parameters tested according to the national standard: positive vulcanization time t 90 =6.32min, minimum torque M L =0.74dN·m, the maximum torque M H =9.32 dN·m, torque increment △M=8.58 dN·m.

Embodiment 3

[0022] Put 100 kg of nitrile rubber resin and 25 kg of mixed hydroxycarboxylic acid mixed with tartaric acid and malic acid at a weight ratio of 4:1 into the internal mixer at one time, and mix evenly at 35°C to obtain a compound compound ; Then, the composite rubber is quickly sent to a flat vulcanizing machine at a temperature of 135°C for vulcanization, and it is discharged after 60 minutes and cooled to obtain a vulcanized nitrile elastomer. The vulcanization characteristic parameters tested according to the national standard: positive vulcanization time t 90 =44.21min, minimum torque M L =0.77dN·m, the maximum torque M H =8.68 dN·m, torque increment △M=7.91 dN·m.

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Abstract

The invention relates to a method for vulcanizing a nitrile elastomer. The method is characterized by comprising the following steps: adding 100 parts by mass of nitrile rubber resin and 5-55 parts by mass of vulcanized cross-linking agent, and mixing at 20-50 DEG C to obtain a composite sizing material; feeding the composite sizing material into reacting equipment at 130-200 DEG C for vulcanization reaction; and discharging after 5-6 minutes and cooling to obtain the nitrile elastomer, wherein the vulcanized cross-linking agent is tartaric acid, malic acid or lactic acid or mixed hydroxy carboxylic acid of two or three of the above hydroxy carboxylic acids mixed at any ratio; and the nitrile rubber resin is chemigum resin, butadiene rubber resin, powdered nitrile rubber, carboxy terminated nitrile rubber resin or liquid carboxy terminated nitrile rubber resin, or the mixed nitrile rubber resin of two or three nitrile resins mixed at any ratio. The method has the advantage of simple vulcanization system, and the cross-linking agent is non-toxic, thereby meeting the requirement of low-carbon and environment-friendly chemical industry development and having wide application prospects.

Description

technical field [0001] The invention relates to a vulcanization method of an elastomer, in particular to a vulcanization method of a nitrile elastomer. Background technique [0002] Vulcanization is a general term for bridging and crosslinking of rubber macromolecules, and is the prerequisite for elastomers to have excellent performance. After vulcanization, the linear macromolecular chains of rubber will be cross-linked into a three-dimensional space network structure, which will not cause chain slippage due to stress, so that vulcanized rubber has good viscoelasticity. According to the properties of the main cross-linking bonds of the three-dimensional network structure, vulcanized rubber can be roughly divided into: covalent cross-linking elastomers, coordination bond cross-linking elastomers, ionic bond cross-linking elastomers, van der Waals force cross-linking elastomers and Five types of hydrogen bonded cross-linked elastomers. Among them, covalently cross-linked el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L9/02C08L15/00C08L13/00C08K5/092C08K5/09
Inventor 陈荣国钱庆荣卓倩陈庆华肖荔人
Owner FUJIAN NORMAL UNIV
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