What is "TPE sealant" Dechuang takes you to understand.

Time：2021-10-09Hits：1574

Recently, I have often received information from customers about TPE encapsulation, and all kinds of intractable diseases have come. About the poor adhesiveness of TPE encapsulation, the delamination of TPE encapsulation material in the gate, the whitening of TPE encapsulation material when scratched by fingers, and the delamination of TPE encapsulation material ... A series of problems related to TPE encapsulation material. Today, we will share with you the relevant knowledge of TPE encapsulation material, hoping to help more enterprises solve the problems in the production process of TPE encapsulation material in the future. 1. what is TPE encapsulation? TPE encapsulation, as its name implies, is to encapsulate TPE soft rubber material onto other materials. Generally, the processing methods are one-step molding with two-color injection molding machine, or two-step injection molding with general injection molding machine and rubber-coated mold. Second, why use TPE to encapsulate? Because there are many hard plastic products, the soft touch, grip, aesthetics and other functional characteristics of the products are improved by introducing thermoplastic elastomer TPE soft materials. 3. What are TPE encapsulated plastics? 1. ABS and PC in TPE package are weak to medium polarity plastics, which have certain polarity difference with TPE. By adding modifier (TPU) into the formula, the polarity of TPE can be improved, thus improving the adhesion between TPE and ABS and PC. In addition, it is recommended that the secondary injection temperature be 180~230℃. It can be adjusted according to the actual processing conditions. 2.TPE PP is a plastic with very weak polarity, which is very close to the polarity of TPE of SEBS substrate. Therefore, the conventional TPE formula can be directly used for encapsulating PP without adding a polarity modifier. Although TPE of encapsulated PP is a general class, the secondary injection temperature is also very important, so it is necessary to use enough injection temperature to ensure the fluidity of TPE and its rapid coating on the surface of PP. This injection temperature should ensure the rapid formation of a fusion layer on the surface of PP plastic, which is beneficial to the adhesion between TPE and PP without causing thermal deformation of PP plastic parts during injection molding. It is suggested that the encapsulation temperature of secondary injection molding should be 170~220℃. Note: PP is encapsulated, and SBS is not recommended as the modified base material of TPE. 3. TPE materials coated with PP are generally based on SEBS, which cannot be coated with PS normally. The material of PS package should be TPE with SBS as the base material before it can be packaged! Generally, materials that can wrap PS cannot wrap PP. 4. There are two ways to encapsulate 4.TPE and nylon PA: one is to form firm encapsulation by bridging. In order to achieve a good bridging effect, the injection temperature of TPE is usually higher, which can reach 240~270℃. Another way is insert injection molding: usually, it is difficult for TPE and nylon PA to form a good bridging effect. However, the contact surface between TPE and nylon is increased by leaving holes on nylon parts and setting grooves, and TPE material is injected into nylon parts through holes to enhance the bonding firmness between TPE and nylon parts. Injection molding has no high requirement on the injection molding temperature of TPE, as long as TPE has enough fluidity to ensure the injection molding effect. Dongguan Dechuang Chemical Co., Ltd. independently researched and developed TPE/TPR plastic raw materials, and its skilled R&D team researched and developed a variety of TPE/TPR brands with different performances, which were applied in different fields. Elastomer was molded separately and encapsulated with PP,PS,PC,PA and ABS. Dechuang Company specializes in tailor-made solutions for customers with fair prices and quality assurance. Welcome customers to inquire! Free consultation hotline: 13827209711 Miss Zhang.

德创化工 (edit：dechuang)