45 degree TPE coated PC casing
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Product details
Thermoplastic elastomer TPE is a material with the characteristics of high elasticity, high strength, high resilience of rubber and injection molding. The invention has the advantages of environmental protection, innocuity, safety, wide hardness range, excellent coloring property, soft touch feeling, weather resistance, fatigue resistance and temperature resistance, excellent processing performance, no need of vulcanization, recycling, cost reduction, secondary injection molding, coating and bonding with PP, PE, PC, PS, ABS and other matrix materials, and can also be formed separately.
I. TPE Encapsulation Concept: TPE Encapsulation Material, as the name implies, is to encapsulate TPE soft adhesive material onto other materials. Generally used processing methods include two-color injection molding machines for one-step molding, or ordinary injection molding machines for two-step injection molding using encapsulated molds. TPE coated molded products are generally handles and handlebars. Because of the special comfortable hand feeling of TPE soft rubber material, the introduction of TPE material has improved the grip and touch hand feeling of the product.
Second, the concept of TPE material: TPE material is a general term for Thermoplastic Elastomer, and its English full name is Thermoplastic Elastomer. It is a kind of functional material with rubber elasticity and plastic stiffness, which can be directly injection molded. TPE materials commonly used for encapsulation refer to TPE-S, i.e. polystyrene thermoplastic elastomer, which is a thermoplastic engineering plastic obtained by composite modification based on SEBS or SBS elastomer. TPE-S elastomer is also commonly called TPE or TPR in the elastomer industry.
Third, the characteristics of TPE-coated PC material: TPE thermoplastic elastomer is SEBS rubber modified material, which has rubber elasticity and is convenient for injection molding or extrusion molding. The rubber hardness can be adjusted in ShoreA0-100 degrees. The common hardness range of TPE compound used for encapsulating PC is 30-80 degrees, and its appearance is natural color or translucent particles. The rubber compound has excellent wear resistance and good adhesion to PC coating, and the finished product feels comfortable and smooth.
4. Processing Method of TPE Encapsulated PC: TPE Encapsulated PC generally adopts the conventional molding method, i.e. two sets of molds, one for injecting PC products first, and the other for injecting TPE compound onto the surface of PC products. This type of molding method is called secondary injection molding, overmolding or insert injection molding. It can also be processed by a more advanced two-color injection molding machine. The results are the same. TPE and PC are well bonded together by injection molding. The injection temperature of glue coating is different according to the hard glue material. Due to the temperature, both hard rubber and TPE soft rubber should be softened to promote the compatibility of the two materials at the contact surface. In order to achieve the true encapsulation effect, the injection temperature of TPE encapsulated PP material is usually about 170-190 degrees Celsius. The encapsulated ABS material is about 220-230 degrees Celsius. The temperature of encapsulated PC material is slightly higher than the injection temperature of encapsulated ABS.
Fifth, the main advantages of TPE application in adhesive-coated shot bonding: TPE elastomer soft adhesive is applied in secondary injection molding and adhesive-coated shot bonding. Because TPE material has good skid resistance and good elastic touch, it can improve the touch feel of products and enhance the grip. TPE elastomer soft adhesive can be adjusted to appropriate hardness (hardness range Shore25-90A) and appropriate physical properties (such as abrasion resistance, scratch resistance, adhesion, melt index, etc.) according to the physical property requirements of the product. It provides various possible material application schemes for different products. TPE is processed by glue coating and injection bonding, and commonly used products such as handles, grips, electronic materials, etc. The material endows the product with comfortable tactility, improves the gripping property, improves the beauty of the product and the added value of the product. Most of the products are exported to the United States, JPN, EU and other developed countries and regions. Because TPE elastomer soft rubber is a green and environment-friendly raw material, the material does not contain phthalate, halogen and 38 SVHC substances of very high concern specified by REACH. According to ROHS, REACH, NP, EN71.PAHS environmental protection testing standards, fully meet the environmental protection requirements of the United States, JPN, EU and other developed countries and regions.
6. TPE coating materials include: TPE can be firmly bonded with common general plastics PP, GPPS, HIPS, ABS and engineering plastics PC, PC/ABS, PA and their modified materials, or can be formed separately.
VII. Application of TPE Encapsulated PC: TPE Encapsulated PC is mainly used for encapsulating electronic and electrical accessories such as hardware tool handles, mobile phone protective covers, game console handles, interphone housings, instrument housings, etc. Generally, TPE with hardness of 50-80 degrees is used for encapsulation of such products, while TPE compounds with different hardness and physical properties may be used for other special products.
