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A stress-cracking-resistant and elastomer technology, applied in the field of plastic materials, can solve the problems of cracking and high residual stress of products, and achieve the effects of simple process steps, good adhesion and reasonable formula
Inactive Publication Date: 2016-06-15
SHENZHEN PUTEMEI RUBBER & PLASTIC RAW MATERIAL
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Abstract
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Problems solved by technology
The char-forming agent plays an indispensable role in the flame retardant effect. The commonly used char-forming agent is polyphenylene ether, but the molecular bond of polyphenylene ether is strong. After molding, the product has high residual stress and is prone to cracking.
Method used
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[0027] The preparation steps are: (1) first fully absorb the softening plasticizer with SEBS rubber resin, and then absorb the SEBS rubber resin, flame retardant, polyphenylene ether resin, polypropylene, polyethylene, carbon-forming Plastics, silicone masterbatches, antioxidants, and light stabilizers are fully mixed in proportion to obtain a mixture; in this embodiment, the step (1) is carried out in a high-speed mixer.
[0028] (2) Add the mixture into a twin-screw extruder with an aspect ratio of 40:1 to 48:1, an extrusion temperature of 210 to 250°C, and a rotation speed of 300 to 500 rpm for melting and kneading, and then extrude in sequence Stress cracking-resistant, halogen-free, flame-reta...
Embodiment 2
[0031] A stress-cracking-resistant halogen-free flame-retardant TPE elastomer and its preparation method provided in this example are basically the same as in Example 1, the difference being that it consists of the following raw materials in mass percentage: SEBS rubber resin 20% , softening plasticizer 15%, flame retardant 25%, polyphenylene ether 14%, carbon-forming plastic (TPU) 4%, polypropylene resin 10%, polyethylene 3%, compatibilizer 5%, black masterbatch 2.4 %, silicone masterbatch 1%, antioxidant 0.3%, light stabilizer 0.3%.
Embodiment 3
[0032] Example 3, a stress-cracking-resistant halogen-free flame-retardant TPE elastomer and its preparation method provided in this example are basically the same as in Example 1, except that it consists of the following raw materials in mass percentage: SEBS Rubber resin 20%, softening plasticizer 15%, flame retardant 25%, polyphenylene ether 14%, carbon-forming plastic (TPU, PA6 half each) 4%, polypropylene resin 10%, polyethylene 3%, phase Compatibility agent 5%, black masterbatch 2.4%, silicone masterbatch 1%, antioxidant 0.3%, light stabilizer 0.3%
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Abstract
The invention provides a stress-cracking-resistant halogen-free flame-retardant TPE (thermoplastic elastomer). The stress-cracking-resistant halogen-free flame-retardant TPE comprises, by weight, 15-50 parts of SEBS (styrene-ethylene-butene-styrene) rubber resin, 20-30 parts of softening plasticizers, 15-40 parts of flame retardants, 10-20 parts of polyphenyl ether resin, 0.1-10 parts of char forming resin, 5-15 parts of polypropylene resin and 2-5 parts of polyethylene resin. The stress-cracking-resistant halogen-free flame-retardant TPE has the advantages that partial polyphenyl ether resin is replaced by the char forming resin, accordingly, risks of environmental stress cracking of formed products can be greatly reduced, the halogen-free flame-retardant TPE formed products with merits of zero halogen, good flame-retardant property, excellent stress cracking resistance, easiness in processing and the like can be quickly manufactured by the aid of a method, and can be widely applied to high-grade earphone cables and other cable products such as data cables, technological steps are simple, and the stress-cracking-resistant halogen-free flame-retardant TPE is easy to implement and high in productivity.
Description
technical field [0001] The invention belongs to the field of plastic materials, in particular to a halogen-free flame-retardant TPE elastomer resistant to stress cracking. Background technique [0002] TPE elastomers are widely used in the field of wire products because of their strong stress resistance and easy processing. However, the current TPE elastomers mainly use SEBS resins, char-forming agents and flame retardants. The char-forming agent plays an indispensable role in the flame retardant effect. Currently, the commonly used char-forming agent is polyphenylene ether, but the molecular bond of polyphenylene ether is strong. After molding, the residual stress of the product is high, and it is prone to cracking. . How to reduce the risk of environmental stress cracking while maintaining the char formation effect is the key to current research and development. Contents of the invention [0003] The purpose of the present invention is mainly to solve the problems in t...
Claims
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Application Information
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