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可降解塑料袋是用塑料颗粒做的吗?

可降解塑料袋是用塑料颗粒做的吗?

来源网址:https://www.swjjkl.com/ 2022-11-21 11:27:01    

一般分为袭两种。一种是【非全降解塑料】。一般为『PE+淀粉』或『PE+崩解剂』的组成,很多公司有销售。这种材料在使用后淀粉的部分会很快,但PE的部分还是很难降解。不过,由于淀粉分解后在材料中留下了空隙,在一定程度上可以更快的降解。崩解剂也不能使PE完全降解,只是在使用后使薄膜碎裂成小块。因此,这种材料不能称为降解材料,根据我国可降解材料标准GB/T 20197-2006的规定,其并不在列。价格一般很便宜,与现有的PE价格差异不大。
Generally, there are two types. One is [non fully degradable plastic]. It is generally composed of "PE+starch" or "PE+disintegrant", which is sold by many companies. The starch part of this material will be fast after use, but the PE part is still difficult to degrade. However, due to the space left in the material after starch decomposition, it can degrade faster to a certain extent. Disintegrating agent can not completely degrade PE, but can break the film into small pieces after use. Therefore, this material cannot be called degradable material, which is not listed according to the provisions of China's degradable material standard GB/T 20197-2006. The price is generally very cheap, with little difference from the existing PE price.
另外一种是【全降解塑料】。一般分为聚羟基酸、聚二酸二醇两类。聚羟基酸包括PLA、PHV、PHBV等等。聚二酸二醇包括PBS、PBSA、PBAT等等。可以直接做成塑料袋的有PHBV、PBS、PBSA、PBAT以及改性过的PLA等。这类材料普遍比较贵,通常要四到六万一吨,国内消费者比较难接受。为了降低成本,也有厂商在这类材料中加入淀粉等物质,但性能会有降低,成本的下降也不是十分明显
The other is [fully degradable plastic]. It is generally divided into two categories: polyhydroxy acid and polydiacid glycol. Polyhydroxy acids include PLA, PHV, PHBV, etc. Polydiacid glycol includes PBS, PBSA, PBAT, etc. PHBV, PBS, PBSA, PBAT and modified PLA can be directly made into plastic bags. This kind of material is generally expensive, usually four to six million tons, which is difficult for domestic consumers to accept. In order to reduce the cost, some manufacturers also add starch and other substances to such materials, but the performance will be reduced and the cost will not be reduced significantly
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