Ultrahigh-mobility propenyl elastomer grafting copolymer and preparation method thereof

Abstract

The invention relates to an ultrahigh-mobility propenyl elastomer grafting copolymer and a preparation method thereof. The copolymer comprises the following components in percentage by weight (wt%): 50-100wt% of propenyl elastomer resin, 0-50wt% of polyolefin resin, 0.5-5wt% of grafted monomer, 0.01-2wt% of initiator, 0.1-1wt% of crosslinking inhibitor, 0.1-1wt% of antioxygen and 0.1-2wt% of liquid accessory ingredient, wherein other components except the initiator are mixed in a high-speed mixer at a certain ratio and are added into a double-screw extruder by main feeding; the initiator is added into the extruder by side feeding; and a product is obtained by fusing, plastifying, kneading, mixing, extruding from a handpiece, bracing, cooling, pelletizing and drying. Compared with the prior art, the ultrahigh-mobility propenyl elastomer grafting copolymer disclosed by the invention has the advantages of higher product grafting ratio, lower gel content, excellent comprehensive performance and excellent impact performance by the side feeding technology, and is especially suitable for thin-wall products and large producing pieces in the fields, such as interior / exterior trim parts ofautomobiles, bumpers, railway equipment and the like.

Description

technical field [0001] The invention relates to a modified polymer copolymer and a preparation method thereof, in particular to an ultra-high fluidity propylene-based elastomer graft copolymer and a preparation method thereof. Background technique [0002] Propylene-based elastomer is a new type of copolymer with unique semi-crystalline propylene and ethylene, which can provide elasticity, flexibility and impact toughness after blending with polyolefin materials, while ensuring transparency, so it is used in polyolefin materials It has broad application prospects and can replace ethylene-octene elastomer (POE) and ethylene-propylene-diene terpolymer (EPDM) in some occasions. Propylene-based elastomer itself has no polarity. To expand the scope of use of this material, apply it to polyolefin plus inorganic filler system or to toughen engineering plastics with certain specific structures, its chemical polarity must be changed. Generally, the chemical modification method of po...

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Problems solved by technology

[0003] Nylon (PA) ranks first among the five general-purpose engineering plastics. It is flexible, wear-resistant, high in mechanical strength, good in heat resistance, and excellent in flow processability. At the same time, nylon is a crystalline polymer that will There is a sharp yield point, and after passing the yield point, the stress will gradually increase with the increase of the strain. Therefore, unmodified nylon cannot be used in the fields of automotive interior and exterior trims, bumpers, and railway equipment, and its ductility is required. , Notched impact strength is modified, but the impact strength of the modified toughened nylon can meet the requirements of use, but some parts used in the fields of automotive interior and exterior trims have the characteristics of thinner walls and larger sizes. Conventional Due to the relatively poor flow properties of the elastomer graft copolymer, the flow properties of nylon will be sharply reduced, thereby affecting the performance of the final product, especially product defects such as insufficient injection molding and warping.

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