How can white plastic turn yellow to become white? Have we noticed that plastics turn yellow when used for a long time? Yellow plastic doesn't look so good. In fact, there are many solutions. How can the white plastic below turn yellow to turn white?

How can white plastic turn yellow to become white? 1 1. Soak in bleach.

White plastic becomes Huang Shi, and it should be whitened with bleaching powder. First, the bleaching powder should be poured into clear water, and then stirred evenly. Then, the yellow-white plastic should be soaked in the mixed solution for 20 minutes, and the yellow part on the white plastic will gradually fade, and then it can be washed with clear water.

2. Toothpaste cleaning

Yellow white plastic can be cleaned with toothpaste. Apply toothpaste evenly to the yellow area of white plastic, and then brush the yellow area with a brush, and the toothpaste will gradually absorb the yellow area on the plastic. Finally, clean the toothpaste residue on the plastic with clear water.

3, plastic cleaning agent

The yellowing of white plastic can be cleaned by plastic cleaning agent, which is specially designed for the molecular structure of plastic and can quickly remove the substances on plastic. The plastic can be cleaned and sprayed on the yellow part of white plastic, and the yellow area can be restored to white under the decomposition of cleaning agent.

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1. Interpretation of plastics: The broad definition of plastics refers to materials with plastic behavior. The so-called plasticity refers to the deformation when an external force is applied, and it can still maintain its state when the external force is cancelled. The elastic modulus of plastic is between rubber and fiber, and it can be deformed to some extent when stressed. Soft plastic is close to rubber, and hard plastic is close to fiber. In a narrow sense, plastic is defined as a material with resin as the main component and additives such as plasticizer, filler, lubricant and colorant as the auxiliary components, which can flow and form during processing.

2. Action principle of bleaching agent: Bleaching agent is a new type of bleaching powder aqueous solution, which consists of Ca (clo) 2+CaCl2 Ca (OH) 2 H2O+H2O. The main components of bleach are calcium hypochlorite and calcium chloride. Among them, calcium hypochlorite is an effective component, which can react reversibly with water to generate hypochlorous acid (with strong oxidation), reduce colored substances and achieve the purpose of bleaching.

How can white plastic turn yellow? 2 1. Add decontamination powder to the yellow plastic, then scrub it with a brush or rag first, and then rinse off the stains with water, and you will find that the yellow plastic has recovered.

2. Toothpaste cleaning is also one of the methods to whiten yellow gum. In the process of cleaning, you can squeeze toothpaste on the brush first, and then clean the plastic with the brush. Because toothpaste contains decontamination components, it can well deal with the yellowing problem of white plastic.

3. Using bleach is a common cleaning method. In the process of cleaning, after diluting the bleach in proportion, soak the plastic products in the bleach for a while, and then rinse them with clear water, and you will find that the plastic turns white instantly.

4. In addition to the above methods, you can also wipe the yellow plastic products with alcohol, and then wipe the plastic with toothpaste, which can not only solve the problem of yellowing, but also reduce the damage to plastic.

5. You can also wrap a small amount of tea leaves with cloth, then wipe the plastic products with edible oil, and then rinse with clear water to make the yellow plastic white.

Main causes of yellowing of white plastics

The yellowing of white plastic is mainly due to the oxidation reaction of chain polymer under the strong irradiation of sunlight, and the molecular chain inside the plastic will break, which will lead to the change of plastic appearance. Yellowing is one of the common changing phenomena. The main causes of yellowing of white plastics are chemical aging and physical aging;

Chemical aging refers to the irreversible oxidation reaction of white plastic, which leads to the change of polymer structure of plastic, mainly divided into degradation and crosslinking. Degradation refers to the appearance change caused by the molecular chain breakage caused by the interference of external factors on the polymer structure of white plastics. Cross-linking refers to the cross-linking reaction of molecules that break the chain after interaction.

Physical aging means that white plastic is in an unstable state for a long time, and it will lose its balance if it is stored in a high temperature environment for a long time. This leads to the change of molecular materials, and the white plastic turns yellow.

How can white plastic turn yellow? 3 1. Disinfecting water: Disinfecting water and water are mixed at the ratio of 1: 200, and then poured into a basin, and yellow plastic articles are put inside. After soaking for half a day, the stain will naturally fall off and can be disinfected.

2. Wipe with decontamination powder: Pour a proper amount of decontamination powder and water into the basin, put yellow plastic into it and scrub it with a rag. You will find that the dirty place has been washed clean, and then rinse it with water.

3. Toothpaste: Toothpaste is an item to be used at ordinary times. If you don't throw away the unused toothpaste, you can squeeze the toothpaste on the plastic, and then brush the plastic basin carefully with a toothbrush. Toothpaste can effectively decontaminate, which is convenient and simple.

4. Alcohol wiping: Yellow plastic articles can be wiped with cotton dipped in appropriate alcohol, then wiped with flannel dipped in toothpaste, and then washed with water after alcohol wiping.

5. Bleach: At this time, you can dilute the special bleach, then soak the plastic products for a while, and finally wash them with clear water.

Causes of yellowing of plastics

1. The reason why plastic turns yellow is that it is oxidized to form a yellow substance.

2. Plasticizer will decrease in the air, and the color will fade after the decrease, and the plastic will oxidize and turn yellow.

3. Yellowing after long-term use is due to the aging of the materials used, or it may be due to degradation.