To measure the transparency of some plastics, there are many standards, such as light transmittance, haze, refractive index birefringence and dispersion.
According to the light transmittance of the material, it can be divided into: transparent material: the transmittance of visible light of wavelength 400nm-800nm ​​is above 80%; the transmittance of visible light of 400nm-800nm ​​is 50%-80%. Opaque material: 400 nm to 800 nm visible light has a refractive index of 50% or less. According to the above classification, the resin can be divided into transparent resin: mainly including PMMa, PC, PS, PET, PES, JD series, CR-39, SaN (also known as aS), TPX, HEMa, BS (also known as K resin). Etc.; Translucent resin: PP, Pa; opaque resin: aBS, POM, PTFE, PF, etc.
Improve the principle of plastic transparency: reduce crystallinity, control clean quality, improve refractive index, and reduce birefringence.
Adding improved transparency of the plastic, a nucleating agent can be added, which is the most effective way to increase the transmittance of the transparent resin, which can promote the crystallization of small molecular substances. It can function as a nucleus in the resin.
Blending improves the transparency of plastics by adding other resins to the transparent resin to improve transparency.
The two-way stretching improves the transparency of the plastic, and can break the original crystal particles in the product to make the crystal size smaller, and achieve the purpose of improving the light transmittance.
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