One of the purposes of blending and modifying plastic extrusion materials

Although there are many types of plastic extrusion material blends, no matter which type of blend, the purpose of blending modification is the same. One of the purposes of modification is to improve some physical properties of plastic extrusion materials. Mechanical properties and expanded application scope.

1) Improve the comprehensive performance of plastic extrusion materials. Utilize the properties of each polymer component, learn from each other's strengths, eliminate the shortcomings in the performance of each single polymer component, maintain their respective advantages, and obtain polymer materials with excellent comprehensive properties. For example, blending polypropylene with polyethylene not only maintains the advantages of high tensile strength and compressive strength of polypropylene and high impact strength of polyethylene, but also overcomes the shortcomings of poor impact strength and stress cracking resistance of polypropylene.

2) Improve the toughness of plastic extrusion materials (improving impact resistance). Using small amounts of one polymer can act as a modifier for another polymer to achieve significant modification effects. Rubber toughened plastics are the most typical example. For example, blend systems such as PVC/rubber and PP/rubber all have good impact resistance; another example is the PA/PE blend system, which greatly reduces the hygroscopicity of PA and improves the low-temperature resistance of PA. impact strength.

3) Improve the heat resistance of plastic extrusion materials. The thermal deformation temperature of most plastics is not high. For some parts that work at a certain temperature, general plastics are not suitable. By blending with plastics with good heat resistance, its heat resistance can be improved.

4) Reduce water absorption and improve product dimensional stability. For example, polyamide has a large water absorption rate, which can easily cause dimensional changes in products, while the PA/PE blend system greatly reduces the water absorption rate of PA.

5) Improve stress cracking performance. For example, PE modified PC, ABS modified PC, etc.

6) Improve other physical and mechanical properties. Such as wear resistance, air tightness, weather resistance, chemical resistance (solvent resistance), damping, adhesiveness, biocompatibility, etc.

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