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Toughening technology and application

by:CSSSLD     2021-01-23
Elastomer mixing method, the method of graft copolymerization has ontology and melt extrusion method. Is the widespread use of melt extrusion method. Shell - Nuclear is crosslinked copolymer elastomers for nuclear, by the high glass transition temperature of polymer as shell copolymer, the particle size of copolymer can be independent of the control in the process of polymerization, is not affected by blending of injection molding processing conditions. In the process of blending of SMAH three acid react with amino end of PA6, at the same time with PMMA physical tangles, make the shell - Nuclear copolymer in the form of individual particles dispersed in the PA6 matrix, the notched impact strength of blend of 1240 j/m.

ordinary rubber depends on its sulfide to form crosslinked network and provide resilience, he is thermosetting. And dynamic vulcanization process, due to the high speed shearing stress, executed vulcanized rubber particles dispersed in the carrier resin, rubber crosslinking micro area mainly provide blend of elastic body, provides the melting temperature of plastic resin liquidity, namely, hot forming. In fact, the dynamic vulcanization technology provides a new kind of thermoplastic elastomer Blending thermoplastic elastomer.

the reaction is in elastomer introducing macromolecular chain capacity to react with PA polar groups in the macromolecular chain of polar compounds. Form part of the chemical combination between the elastomer and PA. There are many carbon double bond in macromolecular elastomer, using maleic anhydride, acrylic acid monomer grafting reaction with elastomer. Such as epdm grafting anhydride graft copolymerization preparation by elastomer with two anhydride functional group, and nylon 6 melt blending, anhydride functional group is easy to react with the end of the nylon 6 amino form chemical bonds, due to the formation of chemical bond significantly improved the elastomer and the interfacial compatibility of nylon 6, toughening PA6 was prepared by the notched impact strength of 1000 j/m.

the so-called nuclear - Shell copolymer is flexible for nuclear, rigid molecules as shell structure of the copolymer. The copolymer of nylon has strong toughening effect, but also developed this year, the new type of toughening agent. Rubber elastomer toughening nylon has good toughening effect, but the addition of rubber elastomer, bending strength and modulus of nylon drastically, blending thermoplastic elastomer POE can not only improve the nylon toughness, and can keep the nylon high rigidity.

elastomer toughening PA and other polymer blend, belongs to the multiphase system. For multiphase system, system compatibility problems among different components, increase the compatibility with PA elastomer, increase the components between the relay, and improve the nature of the interface layer, in order to improve the toughening effect, this is the key technology for production of toughening PA. Using copolymerization with reactive groups, thermoplastic elastomer or blending thermoplastic elastomer, or make elastomer faculties is a very effective way.

the shell - Nuclear copolymer toughening PA a striking feature is dispersed particle diameter itself have been confirmed in the optimum range, less affected by the injection molding process conditions. Toughening effect is remarkable, is PA super toughening new approaches and development direction. Dynamic vulcanization refers to the rubber and thermoplastic resin melt blending vulcanization, when in fact, vulcanization process is the crosslinking process. Must be vulcanized rubber processing, linear structure into three-dimensional or mesh structure has a certain strength and hardness.

this year to develop a new type of thermoplastic elastomers, such as ethylene octene copolymer has excellent flexibility, because there is no double bonds in macromolecular chain at the same time, make it has good weatherability, initially, POE is mainly used for polyolefin toughening, recent studies have found that POE after reactive monomers grafted by maleic anhydride, etc, has the very good compatibility of nylon. Toughening PA6 POE not only has a higher impact strength at room temperature, the impact resistance at low temperature is more excellent, as PA6, PA66 suitable toughening agent.

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