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Polyester material is our common plastic material. Transparent cosmetic bottles and medical polyester bottles are all made of this material. It is the general name of thermoplastic saturated polyester represented by PET. In the field of packaging, pet, especially the development of packaging containers, has attracted much attention. At present, more than 20% of pet has been used in packaging materials, and the trend is increasing year by year. Packaging industry has become the second largest user of pet, second only to synthetic fiber. Because PET plastic is widely used, and most pet products are disposable consumer goods, many waste PET materials will be produced. Some insightful owners recycle pet plastics at a low price and reproduce them through certain processes, which not only solves the problem of environmental pollution, but also creates huge economic value. However, compared with pure PET raw materials, the recycled materials show obvious yellow, which also affects the transparency of the products. In order to make the recycled plastic products as white as new, manufacturers usually add fluorescent whitening agent OB-1 in the process of PET plastic processing to enhance the whiteness and brightness of products.
As we all know, the application field of whitening agent OB-1 is very wide, five general plastics can be used, this whitening agent can not only improve the whiteness and brightness of PET materials, but also increase the transparency of PET materials, especially suitable for pet transparent plastics.
Fluorescent whitening agent OB-1 can absorb ultraviolet light in natural light, and then emit blue violet fluorescence, and yellow and blue are complementary colors, so when the blue light and the yellow light of the article, the article will look whiter and brighter. It is worth noting that the amount of transparent plastic is very small, between 2% to 5% of 100000. If it is added more, it is easy to precipitate, leading to yellowing.
