塑料是一种具有可塑性的物质,加热以後变软,可以在模型里压制成各种塑料制品(叫做塑体)。塑料可以分为受热可熔性(叫做热塑料或塑胶)及受热不可熔性(叫做热硬化塑料或电木粉)二大类。塑料工业是一种新兴的工业,到现在只有五十多年的历史,但是它的发展很迅速,现在航空、汽车,电工、建筑、照相、化学,光学与医疗器材等各方面,以及衣着饰物、家俱、运动器具及玩具等物品,都要用到塑料制品。制造塑料的原料随塑料的种类而不同,种类很多,主要的有煤焦油、焦煤、轻油、水煤气、石油、天然气、松香、乾性油、电石(碳化钙)、纤维素、脲素、糠醛及含有蛋白质 Plastic is a kind of plastic material that becomes soft after heating and can be pressed into various plastic products (called plastic) in the model. Plastics can be classified into two categories: heat-meltable (called thermal plastic or plastic) and thermally infusible (called heat-hardened plastic or bakelite). The plastics industry is a new industry, and it has only been more than 50 years old. However, it has developed rapidly. Nowadays, aviation, automobiles, electrical engineering, architecture, photography, chemistry, optics, and medical equipment, as well as clothing accessories. , furniture, sports equipment and toys, etc., must use plastic products. The raw materials for manufacturing plastics vary depending on the type of plastic, and there are many types. The main ones are coal tar, coking coal, light oil, water gas, oil, natural gas, rosin, dry oil, calcium carbide (calcium carbide), cellulose, urea, furfural, and Contains proteins