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Why silicone glue turn yellow?

Why silicone glue turn yellow?

Some silicone products will be placed in a period of time after the yellowing, especially food-grade silicone master-batch made of silicone products (such as baby pacifiers, silicone bowl, etc.), the color of the yellow people look particularly disgusting, nausea sense. But the quality of the transparent silicone products in the placement of a few years will not turn yellow, which is what causes it?

Silicone products will be roughly summarized the reasons for the following three:

(A) curing agent

1. vulcanizing agent performance is divided into ordinary and anti-yellow. Its scope of application has the following two aspects:

2. Common type non-anti-yellowing agent, used in some can be used for deep color or color requirements are not high non-exposed silicone products.

3. Anti-yellow vulcanizing agent used in the need to be exposed, the color is lighter and more bright, and the color requirements of the higher products.

(B) processing technology

Transparent silicone products in the molding, resulting in transparent silicone products in the color after turning the main problems are:

1. Mold temperature is too high

2. The vulcanization time is too long

3. Problems arising from secondary addition of sulfur

(C) the quality of the silicone material itself is too bad

If we add anti-vulcanizing agent in the compound, but transparent silicone products appear to be still yellow after molding, it may be the raw material of the yellow resistance is too bad, for raw materials, poor resistance to raw materials is recommended Direct refueling.

In conclusion:

Although the silicone products with excellent weather resistance and anti-aging. But sometimes there is still the phenomenon of yellowing of silicone products. In order to avoid this situation, according to the actual needs of the choice of better curing agent, and according to the requirements of silicone products against yellow, and should increase the amount of anti-yellow agent can prevent or inhibit the yellowing speed; Control the temperature of the mold and the product of the curing time; also in the raw materials should pay attention to the raw material of silicone itself against yellow.

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