Any substance that can increase the plasticity of polymer compounds or polymer materials is called a plasticizer . They are usually high-boiling, refractory liquids, or low-melting solids. The application of plasticizers started with nitrocellulose, and is now widely used in many high-end products. It is especially widely used in the synthesis and processing of polyvinyl chloride, with an average of 1% per day. font-size: 14px;”>100parts of polyvinyl chloride resin.About to add50Around portions.
Among all organic additives, plasticizers Its annual output and consumption rank first, and 80% of the total plasticizer output is used in the production and processing of vinyl chloride. It is estimated that there are more than 600 kinds of plasticizers that have been researched and produced abroad. However, currently there are only about 200 varieties produced as commodities. According to incomplete statistics, there are more than 70 kinds of plasticizers that have been developed and produced in our country.
After adding plasticizers to polymer compounds or polymer materials, the following purposes can be achieved:
(1) Reduce the softness temperature of the polymer, making the polymer soft and elastic within the use temperature range , adhesion and other properties, thereby improving the performance of the product;
(2) Reduce the melting temperature or melt viscosity of the polymer to facilitate processing and molding.
A good plasticizer should have the following properties:
①With polymers (such as resin, rubber, etc.) Good compatibility
②Great plasticizing effect;
③Good heat resistance and light resistance
④Good cold resistance;
⑤Good weather resistance;
⑥Small migration,
⑦ Low volatility;
In fact, it is impossible to require a plasticizer to meet all the above conditions. Therefore, in most cases, two or more plasticizers are mixed and used.
