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Preparation method of reinforced anti-aging nitrile elastomer

An elastomer-like and anti-aging nitrile technology is applied in the field of preparation of nitrile elastomers to achieve good mechanical properties and good reinforcement and anti-aging properties.

Active Publication Date: 2011-08-24
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nitrile elastomer obtained by this method has good oil resistance and benzene resistance, however, it has poor tensile strength, tear strength and anti-aging performance, which is far from the actual application requirements in many occasions
The reasons for the above phenomenon are as follows: (1) Nitrile rubber resin is a non-crystalline amorphous polymer without self-reinforcement, and generally has poor mechanical properties without reinforcement; (2) The hydroxyl group introduced by this vulcanization method Carboxylic acid vulcanization cross-linking agent is a multifunctional active substance. Once there are uncross-linked groups remaining during the vulcanization process, the residual groups will easily become reactive sites for thermo-oxidative aging, thereby deteriorating the nitrile elastomer to a certain extent. anti-aging performance
It can be seen that the use value of unreinforced anti-aging nitrile elastomer is low, and its application field is naturally greatly limited
[0005] So far, on the basis of non-traditional covalent vulcanization formulations using hydroxycarboxylic acid as vulcanization cross-linking agent, there is no research on the reinforcement and anti-aging of nitrile elastomers. see the report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put 100 kg of nitrile rubber resin, 5 kg of tartaric acid, 20 kg of laurylamine, 60 kg of white carbon black and 0.5 kg of anti-aging agent A into the internal mixer at one time, and mix them evenly at 20 ° C to obtain a composite rubber Material; then the composite rubber is quickly sent to a flat vulcanizing machine with a temperature of 140°C to cause a vulcanization reaction to the composite rubber. After 60 minutes, it is discharged and cooled to obtain a reinforced anti-nitrile elastomer. The physical parameters of the sample were tested according to the relevant national standards: the tensile strength was 31.2Mpa, the elongation at break was 480%, the tear strength was 36.3kN / m, and the Shore hardness was 78. The physical parameters of the sample aged in an air oven at 130°C for 500 hours were tested by the same method: the tensile strength was 31.0Mpa, the elongation at break was 470%, the tear strength was 36.4kN / m, and the Shore hardness was 76.

Embodiment 2

[0029] Put 100 kg of nitrile rubber resin, 35 kg of malic acid, 10 kg of stearic acid, 35 kg of carbon black and 1.5 kg of anti-aging agent 264 into the internal mixer at one time, and mix them evenly at 35 ° C to obtain compound Rubber material; then the composite rubber material is quickly sent to a flat vulcanizing machine at a temperature of 170 ° C to cause a vulcanization reaction to the composite rubber material. After 25 minutes, it is discharged and cooled to obtain a reinforced anti-nitrile elastomer. The physical parameters of the sample were tested according to the relevant national standards: the tensile strength was 20.3Mpa, the elongation at break was 420%, the tear strength was 30.3kN / m, and the Shore hardness was 70. The physical parameters of the sample aged in an air oven at 130°C for 500 hours were tested by the same method: the tensile strength was 20.3Mpa, the elongation at break was 410%, the tear strength was 30.1kN / m, and the Shore hardness was 69.

Embodiment 3

[0031] Put 100 kg of nitrile rubber resin, 55 kg of lactic acid, 1 kg of lauric acid, 5 kg of calcium carbonate and 3 kg of anti-aging agent D into the internal mixer at one time, and mix them evenly at 50 ° C to obtain a compound compound ; Then the composite rubber is quickly sent to a flat vulcanizing machine with a temperature of 210 ° C to cause a vulcanization reaction to the composite rubber. After 5 minutes, it is discharged and cooled to obtain a reinforced anti-nitrile elastomer. The physical parameters of the sample were tested according to the relevant national standards: the tensile strength was 10.5Mpa, the elongation at break was 340%, the tear strength was 13.1kN / m, and the Shore hardness was 58. The physical parameters of the sample aged in an air oven at 130°C for 500 hours were tested by the same method: the tensile strength was 9.4Mpa, the elongation at break was 345%, the tear strength was 13.0kN / m, and the Shore hardness was 76.

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Abstract

The invention relates to a preparation method of a reinforced anti-aging nitrile elastomer. The preparation method is characterized by comprising the following steps: adding 100 parts by weight of nitrile rubber resin, 5-55 parts by weight of vulcanization crosslinking agent, 1-20 parts by weight of compatilizer, 5-60 parts by weight of reinforcing filler and 0.1-3 parts by weight of anti-aging agent into processing equipment together, and evenly mixing at 20-50 DEG C to obtain composite rubber; and quickly sending the composite rubber into a reactor with 140-210 DEG C so as to carry out vulcanization reaction on the composite rubber for 5-60 minutes, discharging, and cooling to obtain the reinforced anti-aging nitrile elastomer. Compared with the unreinforced anti-aging nitrile elastomer, the reinforced anti-aging nitrile elastomer obtained by the method provided by the invention has better mechanical properties, and satisfies the requirements for practical application.

Description

technical field [0001] The invention relates to a preparation method of a nitrile elastomer, in particular to a preparation method of a reinforcing and anti-aging nitrile elastomer. Background technique: [0002] Vulcanization is a general term for the bridging and cross-linking of rubber macromolecular chains into a three-dimensional space network structure, and it is the prerequisite for elastomers to have excellent performance. The three-dimensional network structure of vulcanized rubber may be dominated by covalent bonds, coordination bonds, ionic bonds, hydrogen bonds or van der Waals forces, which are called covalent crosslinks, coordination bond crosslinks, ionic bond crosslinks, Hydrogen bonded and van der Waals crosslinked elastomers. Among them, covalently cross-linked elastomers have the best comprehensive mechanical properties and the widest range of applications. [0003] Covalently cross-linked nitrile elastomers, including nitrile rubber, hydrogenated nitri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/02C08L15/00C08L13/00C08K13/02C08K5/092C08K5/09C08J3/24
Inventor 陈庆华陈荣国肖荔人
Owner FUJIAN NORMAL UNIV