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塑料属高分子化合物,分子量可达几十万、几百万,甚至几千万。分子量虽大,但其化学组成却比较简单,都是由几种简单的化合物(单体)聚合或缩合而成。它具有许多优良特性,如富有弹性和塑性、耐腐蚀,质轻,绝缘性能好等。因此它的用途很广,无论在工农业生产中或日常生活中都占有重要的地位。随着农业科学技术的发展,塑料在农业上用途也日渐广泛,需求量大增。如塑料薄膜可用来育秧、覆盖作物及蔬菜温室等。由于农村人民生活的日益提
Plastic is a polymer compound, molecular weight up to hundreds of thousands, millions, even tens of millions. Although the molecular weight is large, but its chemical composition is relatively simple, are composed of several simple compounds (monomers) polymerization or condensation. It has many excellent features, such as flexible and plastic, corrosion-resistant, lightweight, good insulation properties. Therefore, it is used for a wide range of purposes and occupies an important position both in industrial and agricultural production and in daily life. With the development of agricultural science and technology, the use of plastic in agriculture is also becoming more and more widespread, with the demand soaring. Such as plastic film can be used to seedlings, covering crops and greenhouses. Due to the increasing life of rural people