来源：http://www.ok9868.com 发布时间：2019-07-08 18:54:00 点击：
The main component of mold plastics is resin. It first separates the fat from pine gum and other trees from the rosin emulsion. Later, it was found that the secretions of tropical insects were made of resins such as lac. Petroleum also contains some resins, such as asphalt. These are all natural phenomena, which are characterized by no obvious melting point, gradually heating after softening, soluble in organic solvents, and insoluble in water. Because the quantity or quality of natural resins can not meet the needs of reality, resins are synthetic resins in actual production. Synthetic resins are synthesized according to the molecular structure and characteristics of natural resins. Because it is made of small materials with relative molecular weight through polymerization, and materials with relative molecular weight, it is called polymer, or polymer for short. Generally, it is solid at room temperature and pressure, and there are also dense liquids.
Some compact resins can be directly used as mould plastics (e.g. polyethylene, polystyrene, nylon), but some synthetic trees must be added with some additives in order to be used as mould plastics (e.g. phenolic resin, amino resin, polyvinyl chloride).
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