Modified ethylene propylene diene monomer and preparation method thereof

An EPDM rubber modification technology, applied in the rubber field, can solve the problems of EPDM rubber vulcanization difficulties, low production efficiency, long reaction time, etc., and achieve simple and easy to implement reactions, fast reactions, and high grafting rates Effect

Active Publication Date: 2018-09-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the reaction time of existing solution grafting method is too long, and production efficiency is low, and the side chain double bond of the ethylene-propylene rubber after the modification of existing grafting method just disappears after grafting MAH, makes the vulcanization of ethylene-propylene rubber more difficult

Method used

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  • Modified ethylene propylene diene monomer and preparation method thereof
  • Modified ethylene propylene diene monomer and preparation method thereof
  • Modified ethylene propylene diene monomer and preparation method thereof

Examples

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preparation example Construction

[0050] According to the second aspect of the present invention, the present invention provides a kind of preparation method of modified EPDM rubber, the method comprises: under the condition of olefin ring-opening cross-metathesis reaction, in the presence of the catalyst of the structure shown in formula (2) Next, the EPDM rubber is contacted with the compound represented by the formula (1) in an organic solvent, the EPDM rubber contains structural units derived from a third monomer, and the third monomer is a non-conjugated diene,

[0051]

[0052] In formula (1), R is a C1-C10 substituted or unsubstituted alkyl group or a C6-C20 substituted or unsubstituted aryl group.

[0053] Formula (2), R 1 is hydrogen, C2-C20 substituted or unsubstituted alkenyl, C2-C20 substituted or unsubstituted alkynyl, C1-C20 substituted or unsubstituted alkyl, C6-C20 substituted or unsubstituted aryl , C2-C20 substituted or unsubstituted carboxylate, C1-C20 substituted or unsubstituted alkox...

preparation example 1

[0114] This preparation example is used to illustrate the preparation method of methyl nadic acid anhydride.

[0115]Add 15.7 grams (0.16 mol) of maleic anhydride and 40 mL of toluene to a 100 mL reaction flask, place the reaction flask in a constant temperature cold bath, stir and cool to 5°C, and add methylcyclopentadiol dropwise through a constant pressure dropping funnel 16 grams (0.2mol) of alkene, control the temperature in the reaction flask not to exceed 15°C, after the dropwise addition, the temperature of the reaction is raised to 120°C and continue to stir for 1 hour, the white crystals are precipitated by cooling, the crude product of methylnadic acid anhydride is filtered out, and then Recrystallize with toluene, filter and dry to obtain 20.5 g of methyl nadic anhydride, the melting point (mp) of methyl nadic anhydride is 164°C-165°C, and the yield is 71.9%.

Embodiment 1

[0117] This example is used to illustrate the modified EPDM rubber provided by the present invention and its preparation method.

[0118] With 8 grams of EPDM rubber (3280, purchased from Yanshan Petrochemical Company, the content of ethylene structural unit in EPDM rubber is 55% by weight, the content of structural unit derived from the third monomer is 5% by weight, the weight average The molecular weight is 300,000, and the third monomer is 5-ethylidene-2-norbornene (ENB)), 1.1 gram of methyl nadic acid anhydride that preparation example 1 makes in N 2 Under protection, dissolve in 90mL xylene solution until completely dissolved to form a reaction system; at the same time, weigh 0.05g of the catalyst with the structure shown in formula (5) (commercially purchased from Bailingwei Technology Co., Ltd., the same below), and dissolve it in 10mL di in toluene solution to obtain catalyst solution C1.

[0119] Heat the obtained reaction system to 70°C, add 2mL of catalyst solutio...

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Abstract

The invention relates to the field of rubbers, and discloses a modified ethylene propylene diene monomer and a preparation method thereof, wherein the modified ethylene propylene diene monomer contains a third structure unit derived from a third monomer, the third monomer is a non-conjugated diolefin, at least the part of the third structure unit contains a grafting group derived from a compound having a structure represented by a formula (1), and the grafting rate of the modified ethylene propylene diene monomer is 0.4-3.3 wt% based on the weight of the modified ethylene propylene diene monomer. The preparation method comprises that an ethylene propylene diene monomer contacts the compound having the structure represented by the formula (1) in an organic solvent in the presence of a catalyst having a structure represented by a formula (2) under the conditions of an olefin ring-opening cross metathesis reaction, wherein the ethylene propylene diene monomer contains the structure unit derived from the third monomer, and the third monomer is the non-conjugated diolefin. According to the present invention, the method has advantages of high grafting rate, rapid reaction and simple andeasy-performing steps, and can improve the vulcanization rate of the ethylene propylene diene monomer. The formulas (1) and (2) are defined in the specification.

Description

technical field [0001] The invention relates to the field of rubber, in particular to a modified ethylene-propylene-diene rubber, a preparation method of the modified ethylene-propylene-diene rubber and the ethylene-propylene-diene rubber prepared by the method. Background technique [0002] Ethylenepropylene diene monomer (EPDM) has excellent physical and chemical properties such as high elasticity, viscoelasticity, and electrical insulation, and its application in engineering plastics toughening and ozone aging resistance is very prominent. However, since EPDM rubber is a non-polar rubber, its oil resistance, chemical resistance, self-adhesion and mutual adhesion are poor, and it is difficult to blend with polar polymers, so its application range is limited. Therefore, it is particularly important to modify EPDM rubber to enhance its compatibility with polar polymers. [0003] In the prior art, mainly by grafting EPDM rubber with maleic anhydride (MAH), a strong polar gro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/06C08F232/08C08F4/80
CPCC08F4/80C08F255/06C08F232/08
Inventor 邵明波毕海鹏佟辉孙伟
Owner CHINA PETROLEUM & CHEM CORP
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