Thermoplastic elastomer composition capable of using in low temperature coated nylon and its preparation method

Abstract

The invention provides a thermoplastic elastomer composition capable of using in low temperature coated nylon and its preparation method, and the thermoplastic elastomer composition comprises (1) 50 to 300 parts by weight of a functionalized polymer; (2) 100 parts by weight of a hydrogenated styrene butadiene rubber thermoplastic elastomer; (3) 5-50 parts by weight of a styrene polymer; (4) 50-250 parts by weight of filling oil; (5) 50-300 parts by weight of an inert filler; and (6) 0.1-0.6 part by weight of an additive, weight. The thermoplastic elastomer composition capable of using in the low temperature coated nylon can be used in low temperature secondary-moulding coated nylon, and is strong in binding power, good in fluidity and beautiful in coated product appearance, and excellent in secondary-moulding processing properties, and the nylon binding power of the thermoplastic elastomer composition can be adjusted by variation of secondary injection moulding temperature, thermoplastic elastomers with different requirements on the bonding effect can be met, and the applied range is wider.

Description

technical field [0001] The invention relates to a thermoplastic elastomer composition, in particular to a thermoplastic elastomer composition which can be used for coating nylon at low temperature and a preparation method thereof. Background technique [0002] With the wide application of plastics in production and life, the requirements for them are constantly improving, especially in the application of electrical appliances, electric tools and automobiles, which not only have certain requirements for functions, but also put forward higher requirements for the comfort of use. High requirements, such as the handshake feel of the handle, the anti-slip requirements of the knife handle, etc., so in the production of plastics, the use of thermoplastic elastomers for secondary injection molding of plastics is derived to improve and meet these requirements, such as the use of thermoplastic elastomers to coat PP , PE, ABS, nylon, etc. [0003] At present, there are many coated pro...

AI Technical Summary

Problems solved by technology

[0005] In patent China CN200610053339.3, CN200910182599.4, CN201010548518.0, CN201110326830.X all contain nylon base material, the defect of the thermoplastic elastomer manufactured by this kind of invention is that the cohesive force of coated nylon is low, and because it contains nylon , when the secondary molding is coated with nylon, the processing temperature is high, which will cause damage to nylon products, such as product deformation, gate sintering, etc.

[0006] In Chinese patents CN200810207539.9 and CN200810060252.8, in addition to nylon base material, the former contains EVA, and the latter contains polyurethane material, and these two materials have slow molding speed and poor heat resistance

Since the manufactured elastomer contains nylon material, high temperature must be used when it is coated with nylon in the secondary molding. In application, this type of product has great defects and has no industrial value

[0007] In Chinese patent CN200580007176.9, this type of elastomer uses 0.5-4% maleic anhydride functionalized polyolefin, 1% functionalized hydrogenated styrenic block copolymer or functionalized styrenic copolymer It is made of polystyrene compound and partially hydrogenated styrenic copolymer with more than 1% to less than 2% functionalization, hydrogenated styrenic block copolymer, etc. Its advantage is that the high-temperature secondary coating nylon has strong adhesion, but its disadvantage is that The fluidity of the product is low and the appearance of the coated product is poor. During the overmolding, high temperature molding is used, reaching above 260°C. When the low temperature molding is coated with nylon, the bonding performance is poor.

However, when high temperature is used, it is easy to cause deformation of the product. At the same time, the patented elastomer is sensitive to the processing technology, and it is difficult to control the coating adhesion.

Therefore, its application in many aspects is limited, such as large garden tools, electric tools, and auto parts with complex products.

[0008] In summary, the disadvantages of the secondary coating of nylon in the prior art are the low fluidity of the elastomer product and the poor appearance of the coated product, the coating cohesion is small, and high temperature molding is used during overmolding, which can be molded at low temperature. The bonding performance is poor when molding and coating nylon. When using high temperature, it is easy to cause deformation of the product and cause damage to nylon products. At the same time, it is difficult to control the coating bonding force of the processing technology, which greatly limits its application.

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