Modified ethylene propylene diene monomer and preparation method thereof

A modification technology of EPDM rubber, which is applied in the field of modified EPDM rubber and its preparation, can solve the problems of difficult vulcanization of EPDM rubber, low production efficiency, long reaction time, etc., and achieve a favorable vulcanization process , vulcanization speed increase, the effect of high grafting rate

Active Publication Date: 2017-04-26
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

[0030] According to the present invention, preferably, the preparation method of the modified EPDM rubber includes: under the condition of the ring-opening cross metathesis reaction of olefin, in the presence of a catalyst of the structure represented by formula (2), the EPDM Rubber and Nadic anhydride of the structure represented by formula (1) are contacted in an organic solvent,

[0031]

[0032] In formula (2), R 1 For hydrogen, C2-C20 alkenyl, C2-C20 alkynyl, C1-C20 alkyl, C6-C20 aryl, C2-C20 carboxylate, C1-C20 alkoxy, C2- C20 alkenyloxy, C2-C20 alkynyloxy, C6-C20 aryloxy, C1-C20 alkylthio, C1-C20 alkylsulfonyl or C1-C20 alkylsulfinyl,

[0033] X 1 And X 2 Each independently an anionic ligand,

[0034] L 1 And L 2 Each independently a neutral ligand, and optionally L 1 And L 2 Can be connected to each other to form a two-coordinated neutral ligand.

[0035] In formula (2), R 1 It is preferably a C6-C20 aryl group, and more preferably a phenyl group.

[0036] In formula (2), X 1 ...

preparation example 1

[0117] This preparation example is used to illustrate the preparation method of Nadic anhydride of the structure represented by formula (1).

[0118] 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 and stir to cool to 5°C. Add cyclopentadiene 14 dropwise through a constant pressure dropping funnel. G (0.2mol), control the temperature in the reaction flask not to exceed 15°C, after the addition is complete, heat the reaction to 120°C and continue stirring for 1 hour, cooling to precipitate white crystals, filter out the crude Nadic anhydride, and then recrystallize with toluene After filtration and drying, 19.0 g of Nadic anhydride was obtained. The melting point (mp) of Nadic anhydride was 165.8° C.-167° C., and the yield was 72.3%.

Embodiment 1

[0120] This example is used to illustrate the modified EPDM rubber provided by the present invention and its preparation method.

[0121] 8 grams of EPDM rubber (3280, purchased from Yanshan Petrochemical Company, the content of the ethylene structural unit in EPDM rubber is 55% by weight, the content of the third monomer is 5% by weight, and the weight average molecular weight is 300,000 , The third monomer is 5-ethylidene-2-norbornene (ENB)), 1 gram of Nadic anhydride prepared in Preparation Example 1 is in N 2 Under protection, dissolve in 90mL xylene solution to completely dissolve to form a reaction system; meanwhile, weigh 0.05 g of the catalyst with the structure shown in formula (5) (commercially available from Bailingwei Technology Co., Ltd., the same below), and dissolve it in 10mL In the toluene solution, a catalyst solution C1 was obtained.

[0122] Heat the resulting reaction system to 70°C, add 2 mL of catalyst solution C1 to the reaction system first, and after react...

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Abstract

The present invention discloses a modified ethylene propylene diene monomer and a preparation method thereof, wherein an ethylene propylene diene monomer is subjected to grafting modification with Nadic anhydride having a structure represented by a formula (1) to prepare the modified ethylene propylene diene monomer, and the grafting rate of the modified ethylene propylene diene monomer is 0.4-3.5 wt% by adopting the weight of the modified ethylene propylene diene monomer as the reference. The preparation method comprises that under an olefin ring-opening cross-metathesis reaction condition, in the presence of a catalyst having a structure represented by a formula (2), an ethylene propylene diene monomer contacts Nadic anhydride in an organic solvent. According to the present invention, the preparation method has advantages of high grafting rate, quick reaction, simple steps, and easy performing; and compared to the unmodified ethylene propylene diene monomer, the modified ethylene propylene diene monomer of the present invention has the following advantages that the unsaturation is 0.44-0.68 mol/kg, and the vulcanization rate is increased to a certain degree. The formulas (1) and (2) are defined in the specification.

Description

Technical field [0001] The invention relates to a modified EPDM rubber and a preparation method thereof. Background technique [0002] EPDM rubber (EPDM) has excellent high elasticity, viscoelasticity, electrical insulation and other physical and chemical properties, and is very prominent in applications such as engineering plastic toughening and ozone aging resistance. However, because 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 through the grafting reaction of EPDM and maleic anhydride (MAH), a strong polar group is introduced into the rubber molecular chain, so that the graft has strong polarity and reactivity, thereby As a multifunctional polymer interface compatibilizer a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/06C08F222/04
Inventor 邵明波唐正伟陈建军徐一兵常学工
Owner CHINA PETROLEUM & CHEM CORP
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