How to make white rubber products not yellow or delay yellowing time

1. The surface is coated with a separator, mainly to isolate the air and ultraviolet rays;

2. Consider the yellowing resistance requirements through formula design; Technology comes from rubber technology Lee so-kwon!

Try to avoid direct sunlight.

Clause. 1. With accelerators, yellowing resistance accelerators such as dithiocarbamate can be added to inhibit the degree of aging, but will affect many physical properties and operations.

Clause. 2. Control the hot pressing temperature, the temperature should not exceed 150 degrees, preferably within 140 degrees;

Clause. 3. Add titanium dioxide, and use titanium dioxide to form emission isolation ultraviolet rays. The larger the dosage, the better the effect, and the finer the particle size, the better the effect;

Clause. Fourth, control the amount of heavy metals, light calcium, zinc oxide and oil contain a large number of heavy metals, heavy metals are the main substances for oxidation;

Clause. Fifth, try to minimize the amount of oil, the compatibility of the oil is related, when the oil with poor compatibility penetrates into the rubber surface, the additives dissolved in the oil will also be brought to the rubber surface.

Clause. Sixth, the degree of vulcanization, every time it reaches the point of positive vulcanization, the chain will be seriously broken, and the broken chain is also a form of aging, and it should be slightly less sulfur.

Clause. 7. Adjust the pH of the rubber material, when the rubber material is weak and acidic, it will play a slight inhibitory role in aging.

Clause. 8. Adding an appropriate amount of antioxidant during synthesis also plays an anti-aging role.

Yellowing is caused by rubber aging, there are many factors that cause rubber aging, exclude the following aging causes and vacuum packaging on it:

a) Oxygen and oxygen react with rubber molecules in the free radical chain, and the molecular chain is broken or over-crosslinked, causing changes in rubber properties. Oxidation is one of the important causes of rubber aging.

b) Ozone, ozone is much more chemically active oxygen and more destructive, it also breaks the molecular chain, but the effect of ozone on rubber varies with whether the rubber is deformed or not. When used as rubber for deformation (mainly unsaturated rubber), cracks appear in the direction of stress action, that is, the so-called ozone cracks; When applied to deformed rubber, only an oxide film is formed on the surface without cracking.

c) Heat: Increasing the temperature can cause thermal cracking or thermal cross-linking of rubber. But the basic role of heat is activation. Increasing the rate of oxygen diffusion and activating the oxidation reaction, thereby accelerating the rate of rubber oxidation reaction, is a common aging phenomenon of thermal-oxidative aging.

d) Light: The shorter the light wave, the greater the energy. The most damaging effect on rubber is the higher energy ultraviolet light.

In addition to the ultraviolet rays that can directly cause the breakage and cross-linking of rubber molecular chains, rubber produces free radicals due to the absorption of light energy, which triggers and accelerates the oxidation chain reaction process. The outer light plays the role of heating. Another characteristic of photoaction (unlike heat) is that it grows mainly on the surface of rubber.

For specimens with high glue content, reticular cracks will appear on both sides, that is, the so-called photoouter cracks.

e) Mechanical stress: Under the repeated action of mechanical stress, the rubber molecular chain will be broken to form free Quan, which will trigger the oxidation chain reaction and form a mechanical chemical process. Mechanical breakage of molecular chains and mechanically activated oxidation processes.

Which one can prevail depends on the conditions in which it is located. In addition, it is easy to cause ozone cracking under stress.

f) Moisture: The function of moisture has two aspects: rubber is easy to destroy when it is rained in humid air or soaked in water, which is due to the water-soluble substances in the rubber and the water water mass and other components are extracted and dissolved by water.

Hydrolysis or absorption. In particular, the alternating effects of water immersion and atmospheric exposure will accelerate the destruction of rubber. However, in some cases, moisture does not destroy rubber, and even has the effect of delaying aging.

1. Mixed cleaning method of toothpaste, baking soda and white vinegar: soak the yellowed rubber for 3 hours after adding water, wash it with water and dry it;

2. Soap cleaning method: soap and water to wash out the soapy water, put the rubber inside, wipe it with a cloth, and then rinse it with water;

3. Washing water cleaning method: boil the water used for rice washing, soak the rubber for about 15 minutes, and brush it clean with a toothbrush.

Hello. The whitening of rubber products is also known as frost spraying, which is often left for a period of time after the rubber products are vulcanized and formed, and the surface is like being covered with white dust. But in fact, it is the precipitation of the rubber compounding agent, which forms frosting.

For the whitening phenomenon of rubber products, the common causes are divided into several categories: improper formula design, improper process operation, fluctuating raw material quality, poor storage conditions, rubber aging, etc.

Since we know the reasons, we must grasp the various processes of making products, so as to make better quality products. In the unlikely event that such products are made, our rubber products companies should scrap all the products and strive to provide customers with every qualified product. Hope!!

The process control is not good, and the vulcanization time is a bit short.

Laboratory aging can be placed in a closed ozone chamber, or phthalates such as methyl ethyl ketone peroxide or tert-butyl benzoate peroxide can be used.

The solution soaks the surface, and the white rubber yellows in addition to providing oxidation, and it is best to use high-power UV irradiation to decompose and consume the photoaging agent.

1. Mixed cleaning method of toothpaste, baking soda and white vinegar: soak the yellowed rubber for 3 hours after adding water, wash it with water and dry it;

2. Soap cleaning method: before washing out the soap with soap and water, put the Chongkai rubber inside, wipe it with a cloth, and then rinse it with water;

3. Taohui rice water cleaning method: boil the water used to wash rice, soak the rubber for about 15 minutes, and brush it clean with a toothbrush.

Super white products can be purchased at grocery stores, department stores, etc., and can quickly solve the problem of rubber yellowing. After boiling the orange peel in water, soak the acornaceous glue in rice washing water or boiled water, and after 15 to 20 minutes, brush it off with a toothbrush. 84 disinfectant or hydrogen peroxide can also solve the yellowing of rubber.

You can buy super white products at grocery stores, department stores, etc., which can quickly solve the problem of rubber turning yellow. After boiling the orange peel in water, soak the rubber in rice washing water or boiled water, and after 15 to 20 minutes, brush it off with a toothbrush. 84 disinfectant or hydrogen peroxide can also solve the yellowing of rubber.

Soak in alum and dip the toothbrush in toothpaste.

Plastic rubber turning yellow is one of its basic characteristics, there are many reasons to turn yellow, but one of the most important reasons is the influence of ultraviolet rays, in the use of the type, sunlight, lights can produce ultraviolet rays, ultraviolet radiation plastic turns yellow, but does not affect its yellowing basic characteristics such as hardness, etc.

Soaking alum has a little effect, but the earphones can't be soaked, you can wipe it with a wet towel and tissue with alum.

Therefore, it has antibacterial, astringent and other effects, and can be made into traditional Chinese medicine. Alum can also be used to prepare aluminum salts, baking powder, coatings, tanning, clarifiers, mordants, papermaking, waterproofing agents, etc. Alum water purification was a common folk method in the past.

Yellowing of plastics like watches is a natural law that cannot be changed, because after a long time, the plastic is oxidized, and it has a good effect by dipping a toothbrush in toothpaste.

Take shoes with white rubber soles, for example:

Reason: In the process of processing, storage and use of rubber and its products, due to the comprehensive action of internal and external factors, the physical and chemical properties and mechanical properties of rubber gradually deteriorate, and finally lose the use value, this change is called rubber aging.

Solution: Use white shoe whitening agent.

1. Brush your shoes with a brightener.

2. Then use a brush dipped in toothpaste to brush it.

3. Rinse with water.

4. Finally, wrap a layer of toilet paper and take it out to dry.

Yellowing of plastic rubber is one of them.

There are many reasons for yellowing, but one of the most important reasons is the influence of ultraviolet rays, in the process of use, the sun and lights will produce ultraviolet rays, and ultraviolet radiation plastics make it yellow, but yellowing does not affect its basic characteristics such as hardness, life, etc.

It seems that soaking in alum will have a little effect, but the headphones cannot be soaked, so you can wipe it with a towel and toilet paper stained with alum.

Alum is also known as alum, potassium alum, potassium alum, potassium alum, potassium alum, potassium aluminum sulfate dodecahydrate. It is a double salt of potassium sulfate and aluminum sulfate containing crystalline water. Alum has a sour taste, is cold, and poisonous.

Therefore, it has antibacterial effect, astringent effect, etc., and can be used as traditional Chinese medicine. Alum can also be used to prepare aluminum salts, baking powders, paints, tanning materials, clarifying agents, mordants, papermaking, waterproofing agents, etc. Alum water purification is a method often used by the people in the past.

Alum can be bought at a Chinese medicine shop.