Toughening agent composition and preparation method thereof

Abstract

The invention discloses a toughening agent composition, which comprises, by weight, 0.2%-10.0% of a styrene monomer, 0.5%-10.0% of a glycidyl methacrylate monomer and/or glycidyl methacrylate derivative monomer, 49.5%-94.0% of an ethylene-octene copolymer, 5.0%-49.5% of polyethylene and/or polypropylene and 0.2%-10.0% of talcum powder. By adding the talcum powder, the grafting rate of the epoxidized ethylene-octene copolymer, the epoxidized polyethylene and/or the epoxidized polypropylene in the toughening agent composition is guaranteed while the cross-linking degree is reduced; and the melting point of the initiator is further optimized, so that the cross-linking degree is further reduced.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a toughening agent composition and a preparation method thereof. Background technique [0002] Ethylene-octene copolymer (POE) is a new type of thermoplastic elastomer developed with metallocene, which has the plasticity of plastic and the elasticity of rubber. Using glycidyl methacrylate (GMA) as a monomer and using twin-screws to melt-graft POE is the simplest and most effective method. In the POE grafting formula, some polypropylene and / or polyethylene are often added, which will also undergo grafting reaction with GMA, and even polypropylene and / or polyethylene will cross-link with POE to form a new type of toughening agent. [0003] However, in the process of melt grafting, on the one hand, the liquid GMA monomer is not uniformly dispersed in the resin, and it is easy to self-polymerize at high temperature, resulting in low grafting efficiency; The free radical s...

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Problems solved by technology

[0004] In order to improve the melt fluidity of POE and reduce its degree of cross-linking, Chinese patent (CN 101747600 B) captures and quenches the molecular chains of POE by adding anti-crosslinking agent triphenyl phosphite or dimethylformamide. Free radicals reduce the degree of crosslinking of POE, but this method hinders the grafting reaction, resulting in a lower grafting rate of the obtained product

Chinese patent (CN 102391432 B) discloses a high fluidity ethylene-α-octene graft copolymer and its preparation method. They select a high fluidity POE resin and add lubricants and antioxidants to the system , liquid additives and other additives to inhibit the crosslinking of POE during extrusion, but more additives are added, the reaction system is more complicated, and the reaction is difficult to control

In order to improve the dispersion of monomers and initiators in the resin, the Chinese patent (CN 106674432 A) starts from the extrusion reaction device. They adopt the method of staged feeding, and the reaction monomers and initiators are placed in the second or second twin-screw. Five-stage addition reduces the generation of cross-linked by-products in the process of polymer melt grafting, but the preparation method is cumbersome

Chinese patent (CN 104479078 A) also adopts the composite method of casting film forming equipment and twin-screw extrusion equipment, spraying monomer and initiator through polymer after casting film forming, and then performing twin-screw reactive extrusion method , reducing the uneven dispersion of monomers and the occurrence of cross-linking side reactions during the reaction process, but these operations are cumbersome and require multiple operations, and special equipment is also required

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