TPR (Thermo-Plastic-Rubber material) is a thermoplastic rubber material. It is a kind of thermoplastic soft rubber compound which has rubber elasticity and does not need vulcanization and can be directly processed (such as injection molding, extrusion, blow molding, etc.). The TPR material is made from thermoplastic styrene-butadiene rubber (such as SBS, SEBS), with resin (such as PP, PS), filler, plasticizer and other functional additives mixed together. Such elastomers mainly refer to styrene elastomer SBS, SEBS modified materials. TPR material suppliers refer to the SBS substrate modified elastomer material as TPR for easy distinction, and the SEBS modified material is called TPE. But in fact TPE is a generalized concept, In addition to SEBS and SBS modified materials, it also includes elastomer materials such as TPU, TPV, TPEE, and TPO.
Identification of TPR Sole
The TPR sole has a high density and it seams heavier when weighed with the same size and specifications of other materials. It has the commonality of rubber and plastic, so it has good elasticity. The TPR material is a thermoplastic rubber and does not require vulcanization. Therefore, the TPR material is only resistant to solvents such as 120# and 6#, and dissolves in solvents such as toluene and methyl ethyl ketone. TPR soles are typically processed using an injection molding process. The mating surface will generally leave some inherent features of the process, for example, the fitting surface has a small square and an injection port. If we use the combustion method to identify the TPR material, we must pay attention to the TPR combustion has following characteristics:
1. The TPR material will ignite and flame, which is a flash of lightning;
2. The TPR material in the fracture of the combustion is molten;
3. When we withdraw the fire source, the TPR will not self-extinguish from the fire.
Features of TPR Outsole
The TPR sole is a new type of environmentally friendly thermoplastic rubber material of which SBS is the base material. It has properties of both rubber and plastic. It does not require vulcanization, and the processing technology is simple. After heating, it is injection molded. TPR material has adjustable physical properties and is easy to form. The price determines the quality of the sole. TPR can be recycled and is also a new environmentally friendly material. The elasticity of TPR sole is better than that of PVC. The easiest way is to hold the sole firmly and drop it naturally. If it can be bounced, it is TPR. The sole of PVC material is cheaper than TPR, but the quality is not good, especially in winter, it is easy to break. TPR materials have the properties of rubber and can be processed and recycled according to thermoplastics. They can be made into rubber products by injection molding, extrusion molding and blow molding using ordinary plastic molding machines. TPR is easy to mold and is made in one shape. The TPR particles are bright and have light reflectivity, especially for transparent materials.
TPR Sole Bonding Problem
The conventional TPR material has a strong polarity, and a good adhesion can be obtained by a certain type of surface treatment agent. Shoe companies are constantly reducing costs from all aspects, so TPR is not likely to have pure TPR materials. For example, adding PP, PE, PVC, recycling TPR, etc. to the TPR material to reduce the cost of the TPR sole, so price varies a lot on the market. When companies want to make products more competitive, it is understandable to reduce costs. However, more pure TPR material is, the easier to bond. Adding too much other material to TPR throws a test to surface treatment agent. Many adhesive companies are also very headaches for this, but we are not afraid of encountering difficult bones. We have a series of TPR treatment agents such as 214T, 216T and 603S for you to choose from. GOOD Adhesive has more than 15-year experience on adhesive production, we can professionally solve many bonding problems. When you encounter a problem, please contact GOOD Adhesive immediately, we will be happy to help you!