Modified plastic hardness
Hardness refers to the ability of a material to resist the pressing of other hard objects into its surface.
The magnitude of the hardness value is a conditional quantitative representation of the degree of softness and hardness of the material. It is not a purely defined physical quantity. The hardness value depends not only on the material itself, but also on the test conditions and the measurement method, that is, the different hardness measurement methods, and the hardness values ​​measured for the same material are not the same. Therefore, to compare the hardness between materials, the hardness values ​​measured by the same measurement method must be comparable.
The methods commonly used to indicate hardness are as follows:
a, Shore hardness
b, Rockwell hardness
c, Mohs hardness
Add hardness of modified plastic
The hardness of the added modified plastic refers to a modification method in which a hard additive is added to the plastic. Commonly used hardness fillers are rigid inorganic fillers and fibers.
(1) Adding a rigid inorganic filler
Surface treatment improves the hardness of plastics
The method for improving the surface hardness of plastics means that only the hardness of the appearance of the plastic product is improved, and the hardness inside the product is unchanged. This is a low cost hardness improvement method.
This modification method is mainly used for housings, decorative materials, optical materials, and daily necessities. This modification method mainly includes three methods of coating, plating and surface treatment.
Blending and compounding to improve the hardness of plastics
(1) Blending improves the hardness of plastics
The improved method of plastic blending is to mix high hardness resin in low hardness resin ※ ※ to improve its overall hardness. Common blending resins are: PS, PMMa, aBS and MF, etc. The resins to be modified are mainly PE, Pa, PTFE and PP.
(2) The hardness of the composite improved plastic
The method of improving the hardness of the plastic composite is to combine a high hardness resin on the surface of the low hardness plastic product. This method is mainly suitable for extrusion products such as plates, sheets, films and pipes. Commonly used composite resins are PS, PMMa, aBS, MF, and the like.
Flexible plastics
Intuitively, the flexibility of plastic refers to the softness of plastic products, that is, the softer the plastic products, the better the flexibility. In polymer physics, flexibility is defined as the property of a polymer chain to change its uniformity. The flexibility of a plastic depends on the molecular chain structure of its polymer.
Add plasticizer to improve the flexibility of plastics
The main function of the plasticizer is to improve the processability of the resin, that is, to lower the processing temperature and improve the processing fluidity. However, it can also impart flexibility to the article by adding it to the relevant resin.
Resins suitable for plasticizers for improved flexibility are: PVC, PVDC, CPE, SBS, Pa, aBS, PVa and chlorinated polyethers.
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