Why plastic doesn't yellow

Some people have many misunderstandings about fluorescent whitening agents, and think that they will never touch this substance. In fact, there are many things in our life that use fluorescent whitening agents, such as plastic products. The reason why we can see that some plastic products are very good in quality and appearance, and even the products are still as new after long-term use is the credit of fluorescent whitening agents.

 

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It is believed that plastic products are indispensable to every household. Now people are used to clean up their homes. If the plastic products in their homes turn yellow, it will give people the feeling of old and unclean. Therefore, many manufacturers of plastic products will add various additives to ensure the appearance quality of products, Among them, whitening agent plays a role in improving the appearance of plastic products

 

What are the requirements of fluorescent brighteners for plastics?

 

The appearance quality of products produced by some plastic products manufacturers is very good, and they won't appear yellowing even for many years. The appearance of products produced by some plastic products manufacturers is relatively good just after they are made, but they have turned yellow before they are sold. The reason for this situation is that the fluorescent whitening agent chosen is not very suitable.

 

The main reason for this problem is that the selected brightener has poor weatherability. We know that some plastic products need to be exposed to sunlight all the year round, and the damage of ultraviolet light to the products is very serious. If the weatherability of fluorescent brightener is not good, it is easy to make the products appear yellowing.

 

In addition, the production temperature of most plastic products is relatively high. Generally, the temperature of plastic molding needs to reach 150-280 ℃, so the fluorescent whitening agent selected at this time needs to ensure that there will be no decomposition and discoloration within this temperature range, so as to avoid gelatinization and affect the whitening effect