Thermoplastic elastomer composition of encapsulation PETG (poly(ethylene terephthalate) glycol) and preparation method thereof

Abstract

The invention relates to a thermoplastic elastomer composition of encapsulation PETG (poly(ethylene terephthalate) glycol) and a preparation method of the thermoplastic elastomer composition. The composition is prepared from the following raw materials in weight percentage: 15-35% of SEBS (styrene-ethylene-butadiene-styrene), 18-40% of a plasticizer, 30-45% of TPU (thermoplastic polyurethane), 5-10% of a compatilizer, 0.2-0.4% of an antioxidant, and 5-20% of an inorganic mineral. The preparation method comprises weighing raw materials proportionally by weight; mixing SEBS and the plasticizer in a high mixing machine for 20-30min, adding other raw materials, mixing, and taking out; and placing into a double screw extruder for extrusion granulation, wherein the rotation speed of the main machine of the screw is 200-350rpm, and the processing temperature is in the range of 180-220 DEG C. The thermoplastic elastomer composition of the invention has the following advantages: the polarity of SEBS is changed, resulting in chemical reaction of surfaces of the elastomer and the copolymer polyester and high bonding strength of secondary injection molding, and after stripping, a layer of the elastomer completely adheres on the surface of the PETG backing material, resulting in comfort handfeel and strong gripping strength; and the composition is a non-toxic and innocuous environment-friendly material for human and environment, and fully meets the requirements of high-end toothbrushes for PETG encapsulation.

Description

technical field [0001] The invention relates to a thermoplastic elastomer material and a preparation method, in particular to a thermoplastic elastomer composition encapsulated with PETG and a preparation method thereof. Background technique [0002] Copolyester PETG has good processability, transparency, and chemical resistance, and is widely used in high-end personal care handles (such as toothbrushes, razors). [0003] As we all know, toothbrush handles are generally formed by coating a layer of elastomer with a thermoplastic resin by a secondary injection molding process. Traditional SAN, PS and other brush handles, because the material itself is not resistant to low temperature and chemicals, especially in winter, it is prone to brittleness and fracture, which may potentially cause harm to the human body. At present, copolyester materials are commonly used in high-end toothbrush handles. This material has excellent chemical resistance, excellent low-temperature flexibi...

AI Technical Summary

Problems solved by technology

Traditional SAN, PS and other brush handles, because the material itself is not resistant to low temperature and chemicals, especially in winter, it is prone to brittleness and fracture, which may potentially cause harm to the human body

At present, copolyester materials are commonly used in high-end toothbrush handles. This material has excellent chemical resistance, excellent low-temperature flexibility and excellent transparency. However, general thermoplastic elastomers are not firmly bonded to these two resins. Unable to meet the requirements of use and become a difficult problem in this industry

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