What are the structures of EVA mold rubber shoe materials?

What are the structures of EVA mold rubber shoe materials?
Types of rubber shoe material factory: Rubber shoe material factory is divided into natural rubber and synthetic rubber according to raw materials. According to shape, it is divided into block raw rubber, latex, liquid rubber and powder rubber. Latex is a colloidal water dispersion of rubber; liquid rubber It is an oligomer of rubber, which is generally a viscous liquid before vulcanization; powder rubber is to process latex into powder to facilitate batching and processing. The thermoplastic rubber developed in the 1960s does not require chemical vulcanization, but uses thermoplastic The processing method of plastic is formed. The rubber shoe material factory is divided into two types: general type and special type according to the application.

1. Linear structure: the general structure of unvulcanized rubber. Due to the large molecular weight, it is in the form of fine clusters without external force. When the external force is applied and the external force is removed, the binding degree of the fine clusters changes, and the molecular chain rebounds, resulting in strong Recovery tendency, which is the origin of the high elasticity of rubber.

2. Branched chain structure: the aggregation of branched chains of rubber macromolecular chains forms a gel. The gel is not conducive to the function and processing of rubber. When mixing rubber, various compounding agents often cannot enter the gel area, and the constituent parts are blank , can not form reinforcement and cross-linking, and become a thin part of the product.

3. Cross-linked structure: Linear molecules are connected to each other through the bridging of some atoms or atomic groups to form a 3-dimensional network structure. As the vulcanization process progresses, this structure is continuously strengthened. In this way, the free mobility of the chain segments Decrease, plasticity and elongation decrease, strength, elasticity and hardness increase, compression set and swelling decrease.