Why does the white plastic door of my toilet turn gray

Your household should be PVC plastic, there may be the following reasons:

1.Dust in toilets may be linked to floating dust and high levels of sulphur dioxide in the air.

2.The aging of the protective film produces a large number of hydrocarbon carbonyl groups and other reactive groups, which induces the aging and discoloration of PVC.

3.The amount of south-facing light radiation is large, which is a normal photooxidation effect, and the PVC is degraded, resulting in a conjugated double-bond chromophore, which makes the PVC profile show discoloration.

4.The lead salts used in the formula and the sulfide in the air produce "lead pollution" caused by lead sulfide black matter, and it can also be said that the uneven dispersion of stabilizers causes black spots on the surface of the profile.

5.The electrostatic induction of the profile adsorbs dust, which also increases the aging process, and there are many active substances in these dusts that accelerate the discoloration, and the adsorption surface is difficult to remove.

I think the most likely reason is that the temperature of the toilet is relatively high, which causes oxidation and has a lot to do with the settling in the air.

Then what can be dealt with is to ventilate more, or to coat the plastic surface with colorless paint.

Oh, the landlord accurately said that the plastic door of your toilet is yellow! You don't use a steel wool brush, which leads to damage to the door frame, a basic characteristic of plastic, there are many reasons for plastic yellowing, but one of the most important reasons is the influence of ultraviolet rays, PBT material is no exception, because in the process of lighting, ultraviolet rays will be produced in the lamp, ultraviolet radiation plastic makes it yellow, of course, we can add some anti-ultraviolet materials into the plastic, but this is only to prolong the time it turns yellow, and it will still turn yellow after a long time. However, yellowing of plastics does not affect some of the basic properties of plastics, such as high temperature resistance and flame retardancy.

It seems that soaking it in alum will have a little effect, landlord, you try it! Huh

Hehe, it's been a long time.

The main reason is oxidation, you can check the composition of plastic steel, it contains one that is relatively easy to oxidize.

It is obvious that it is exposed to the outside and has more contact with oxygen, and the inside is not oxidized, so it will change color after the new exposure.

It belongs to the color change caused by the oxidation of the surface.

There may be a problem with the quality of the product, and there may be defects in the antioxidant treatment of the surface.