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Reversible crosslinked ethylene propylene diene monomer and preparation method thereof

A technology of EPDM rubber and EPDM rubber, which is applied in the field of polymer materials, can solve the problems of reducing the fluidity of rubber processing, self-crosslinking, and poor mechanical properties of hydrogen-bonded rubber, and achieve excellent tensile strength properties , high elongation at break, and easy-to-obtain raw materials

Pending Publication Date: 2022-02-18
YIBAO FUJIAN POLYMER MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, reversible covalent bond cross-linked rubber uses thermally reversible reaction to rearrange the intermolecular topological structure, making traditional thermosetting rubber into glass-like rubber that can be repeatedly processed and shaped, with good reversibility and stability, but the preparation process Easy to produce self-crosslinking, which seriously reduces the processing fluidity of rubber, etc.
In addition, ionic bond rubber has poor high temperature resistance and compression set, hydrogen bond rubber has poor mechanical properties and high temperature resistance, etc.

Method used

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  • Reversible crosslinked ethylene propylene diene monomer and preparation method thereof
  • Reversible crosslinked ethylene propylene diene monomer and preparation method thereof
  • Reversible crosslinked ethylene propylene diene monomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 Shown, a kind of preparation method of reversible cross-linked EPDM rubber comprises the following methods:

[0023] S1, EPDM rubber containing double bonds and 2-carboxyimidazole undergo a click reaction to obtain a modified elastomer after carboxyl grafting;

[0024] S2. Carboxyl-grafted modified elastomer and amino-containing compound are subjected to amidation reaction to obtain reversibly cross-linked EPDM; wherein the amino-containing compound is an oxygen-containing amino compound.

[0025] details as follows:

[0026] Add 1 mole part of EPDM rubber containing double bonds into the tetrahydrofuran solution, then add 0.01 mole part of 2-carboxyimidazole for mixing, and then add appropriate amount of methacrylic acid, benzoin dimethyl ether, dialkoxy Acetophenone, ferrocene-tetrafluoroborate, after mixing evenly, a click reaction occurs under the condition of ultraviolet light irradiation, and the modified elastomer after carboxyl grafting is obt...

Embodiment 2

[0029] A reversible cross-linked EPDM rubber is prepared by the following reversible cross-linked EPDM rubber preparation method, including the following methods:

[0030] Add 1 mole part of EPDM rubber containing double bonds to N-methyl-pyrrolidone solution, then add 0.1 mole part of 2-carboxyimidazole for mixing, and then add appropriate amount of maleic anhydride, benzoin bimethyl Ether, benzophenone, and triphenylhexafluoroantimonate sulfonium salt, after mixing evenly, a click reaction occurs under ultraviolet light irradiation conditions to obtain a modified elastomer after carboxyl grafting, in which maleic anhydride, benzoin bis The mass ratios of methyl ether, benzophenone, and triphenylhexafluoroantimonate sulfonium salt to the total mixed solution are 8%, 0.5%, 0.3%, and 0.02% respectively

[0031] Take 1 mole part of the above-mentioned modified elastomer obtained after carboxyl grafting and dissolve it in N-methyl-pyrrolidone solution, and then add 0.1 mole part ...

Embodiment 3

[0033] A reversible cross-linked EPDM rubber is prepared by the following reversible cross-linked EPDM rubber preparation method, including the following methods:

[0034] Add 1 mole part of EPDM rubber containing double bonds to N,N'-dimethylformamide solution, then add 1 mole part of 2-carboxyimidazole for mixing, and then add appropriate amount of acrylic acid and benzoin Dimethyl ether, xanthone, ferrocene-tetra-fluoroborate, after mixing evenly, click reaction occurs under the condition of ultraviolet light irradiation, to obtain the modified elastomer after carboxyl grafting, in which acrylic acid, benzoin bimethazine Ether, dialkoxyacetophenone, and ferrocene-tetrafluoroborate account for 10%, 0.5%, 0.3%, and 0.02% of the total mixed solution by mass, respectively.

[0035] Take 1 mole part of the above-mentioned modified elastomer obtained after carboxyl grafting and dissolve it in N, N'-dimethylformamide solution, and then add 1 mole part of N-(2-acetamido)-2 - tauri...

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Abstract

The invention relates to the technical field of high polymer materials, in particular to a reversible crosslinked ethylene propylene diene monomer and a preparation method thereof. According to the preparation method of the reversible crosslinked ethylene propylene diene monomer, the double-bond-containing ethylene propylene diene monomer and 2-carboxyl imidazole are subjected to a click reaction to obtain a carboxyl-grafted modified elastomer; and then amidation reaction is performed on the carboxyl-grafted modified elastomer and an amino-containing compound to obtain the reversible cross-linked ethylene propylene diene monomer, wherein the amino-containing compound is an oxygen-containing amino compound, so that the recyclable modified EPDM rubber is obtained, and the performance of the rubber is superior to that of a traditional sulfur cross-linked product. Compared with the prior art, the reversible crosslinked ethylene propylene diene monomer has the advantages of excellent tensile strength performance and high elongation at break, and can be directly recycled. The method is simple, raw materials are easy to obtain, cost is low, and the method can be widely applied to daily life and industrial production.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a reversible crosslinked EPDM rubber and a preparation method thereof. Background technique [0002] The rubber industry is a pillar industry of the national economy. Due to its unique mechanical properties (such as high resilience), rubber products have an irreplaceable role in the application fields of automobile manufacturing, building energy saving, track engineering, electronic appliances, aerospace and so on. However, traditional rubber is vulcanized by covalent bonds to build a cross-linked network. The rubber material formed is insoluble and infusible, and it is difficult to recycle and reuse, causing "black pollution" to the environment. At present, my country consumes more than 10 million tons of rubber products, and about the same amount of rubber waste will be produced every year, while the rubber recycling rate is only 5%. Rubber product waste cannot be ef...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08L23/16
CPCC08J3/24C08J2323/16
Inventor 陈奕汲侯汝红
Owner YIBAO FUJIAN POLYMER MATERIALS
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