TPE | TPR is used in the process of shoe soles, toys, electronic products, etc. Depending on the function and appearance requirements, it is necessary to brush, paint or spray the surface of TPR | TPE products. However, in some cases, users may encounter problems such as poor paint adhesion and paint flaking on TPE | TPR products. The root cause is the poor compatibility of the glue coating system with TPE | TPR, which cannot form a certain corrosion on the surface of the product, resulting in the glue penetrating into the surface layer of the product and lacking bonding strength. So, how to solve the problem of TPE | TPR products glue is not strong, spray paint ink off? The authors give some ideas, and hope to give the reader some inspiration:.

　　The first step is to determine the TPE | TPR material

　　According to the relevant requirements of the product, select the appropriate composite system TPE, TPR material. For example, based on abrasion resistance and glue considerations, shoe material TPR usually use SBS system TPR material. Based on softness and elongation considerations of some super soft software toys usually consider SEBS system of super soft TPE.

　　Step 2 Paint glue matching TPE|TPR

　　After matching TPE | TPR material is finished, you need to choose the corresponding paint. Select the coating according to the characteristics of TPE and TPR. About the choice of coating, here is a small suggestion for TPE to let TPE<TPR raw material suppliers to provide some test pieces, and then to the glue paint manufacturers to do testing. Until the debugging of the appropriate paint glue.

　　The main elastomer sticky glue paint difficulty

　　Paint and glue solvents to the TENA water, toluene, water-based acrylate type mainly. With this type of solvent debugging out of the glue, for the main elastomer surface processing, the difficulty is roughly ordered as follows.

　　SBS system low hardness|SBS system (medium to high hardness) "TPU|TPEE" SEBS system low hardness "SEBS system high hardness|TPV|TPO.

　　Some TPE products are more solvent resistant, need to do surface treatment with treatment water first, then brush glue or spray paint.

　　TPE products encounter stretching paint ink off

　　Main reasons.

　　1 The solvent of the paint fails to penetrate into the shallow surface layer of TPE products, and when the products are stretched, the paint which is not firmly bonded will naturally fall off.

　　2 The resin component of the paint is less, although the bottom layer is firmly bonded, but when it encounters stretching, the tensile property is not enough, resulting in the surface cracking.

　　Corresponding solution countermeasures.

　　1. first do surface treatment, then spray paint, or change the polarity and TPE substrate closer to the solvent to adapt the paint.

　　2. Increase the content of tackifying resin in the paint composition.

　　Summary: Although a slap on the wrist, but TPE|TPR material is the basis, generally first choose a good TPE, TPR material, and then choose the corresponding paint glue to match the TPE|TPR material. Choose what kind of glue and paint, you should consult with the paint manufacturer, if necessary, to provide TPE|TPR samples.