Ion crosslinking ethylene propylene diene monomer and preparation method thereof
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An EPDM rubber and ion cross-linking technology, which is applied in the field of polymer materials, can solve the problems of unfavorable ion cross-link formation, high price, and inability to really enter the domestic market.
Active Publication Date: 2019-06-07
浙江博达汽车零部件有限公司
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Problems solved by technology
For example, Zeon Corporation of Japan has successfully developed a high-performance NBR / zinc methacrylic acid cross-linked rubber named "ZSC", and applied it to auto parts, oil field development, armored vehicle tracks and other fields, but due to the price Due to reasons such as high technology and technical limitations, it is impossible to really enter the domestic market
In addition, from the perspective of production technology, due to the side reaction of C-C bond crosslinking in the process of grafting chemical modification initiated by peroxide, which is not conducive to the formation of ion crosslinking, this puts forward higher requirements for the vulcanization process of EPDM profiles. precise temperature control requirements
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Embodiment 1
[0017] Embodiment 1: The preparation of ionically crosslinked modified EPDM rubber comprises the following steps:
[0018] Weigh 1 mole part of toluene diisocyanate (MDI) and dissolve it in xylene, raise the temperature to 60°C, then add 1 mole part of furfuryl alcohol (FA) dropwise, keep warm for 3 hours and cool down to precipitate furfuryl alcohol-toluene diisocyanate (FA -MDI), spare.
[0019] Dissolve 100 parts by mass of EPDM in 500 parts by mass of xylene, add 3 parts by mass of maleic anhydride, heat to 100°C, add dropwise 2 parts by mass of dibenzoyl peroxide dissolved in xylene, and keep warm After reacting for 2 hours, it was cooled, and the solvent was distilled off to obtain carboxylic acid grafted EPDM: EPDM-g-MAH.
[0020] 100 mass parts of grafted EPDM-g-MAH was added to 10 mass parts of FA-MDI and mechanically blended in an internal mixer for 3 hours, then 5 mass parts of bismaleimide and 1 mass part of stearin were added Zinc acid was refined at 100°C for 2...
Embodiment 2
[0021] Embodiment 2: Concrete preparation operation is the same as embodiment 1. The formula of ion-crosslinked modified EPDM rubber is 100 mass parts of EPDM, 2 mass parts of dibenzoyl peroxide, 6 mass parts of maleic anhydride, 10 mass parts of FA-MDI, 5 mass parts of bismaleic acid Zinc stearate of imine and 1.2 mass parts, internal mixer refining temperature 130 degrees centigrade, refining time 1 hour.
Embodiment 3
[0022] Embodiment 3: Concrete preparation operation is the same as embodiment 1. The formula of ion-crosslinked modified EPDM rubber is 100 mass parts of EPDM, 3 mass parts of di-tert-butylperoxycumene, 5 mass parts of maleic anhydride, 8 mass parts of FA-MDI, 5 mass parts of bismaleimide and 0.8 parts by mass of zinc stearate, the refining temperature of the internal mixer is 120° C., and the refining time is 90 minutes.
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Abstract
The invention belongs to the technical field of high polymer materials, and discloses ion crosslinking modified ethylene propylene diene monomer rubber and a preparation method thereof. The ion-crosslinked ethylene propylene diene monomer is prepared from the following raw materials in parts by weight: 100 parts of ethylene propylene diene monomer, 5-10 parts of isocyanate containing an electron-enriched conjugated diene structure, 2-5 parts of an initiator, 3-8 parts of a grafting modifier, 3-5 parts of bismaleimide and 0.5-2 parts of an ionic bond cross-linking agent. The preparation methodcomprises the following steps: performing a reaction on furfuryl alcohol and isocyanate to synthesize the isocyanate containing electron-rich conjugated diene structure; adding carboxylic acid graftedEPDM, and introducing an electron-rich diene structure into an EPDM macromolecular chain through click reaction of carboxylic acid and isocyanate, so that a side group of the EPDM contains a D-A reaction active group; and then adding bismaleimide and an ionic bond cross-linking agent, and refining the materials to obtain the product. The ion crosslinking modified EPDM rubber is excellent in tensile strength performance and high in elongation at break, and can be directly recycled.
Description
technical field [0001] The invention belongs to the technical field of polymer materials, and relates to an ion-crosslinked EPDM rubber and a preparation method thereof. Background technique [0002] Ionically cross-linked rubber, as a new generation of green and environmentally friendly materials, has attracted great attention from academia and industry at home and abroad due to its excellent physical and mechanical properties and the advantages of recyclability. Qingdao University of Science and Technology, South China University of Technology and other units use unsaturated carboxylic acid metal salt as a crosslinking agent to enhance and modify styrene-butadiene rubber (SBR). The results show that the unsaturated carboxylic acid metal salt ion crosslinking can significantly improve the rubber material Strength, modulus, hardness, elongation at break and other mechanical properties, but the modified rubber cannot be reused due to excessive covalent cross-linking, and the ...
Claims
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