Natural Rubber Encyclopedia

Types and dosage of antioxidants commonly used in natural rubber products

Create Date:2020-05-26 08:39:50Click volume:226
Types and dosage of antioxidants commonly used in natural rubber products

Natural rubber has high mechanical strength and good elasticity, and is widely used in the production of rubber products in various industries. However, the unsaturated double bond contained in natural rubber belongs to a substance with strong chemical reaction ability, superimposed on the relationship of α-H, light, heat, ozone, radiation, flexural deformation and metals such as copper and manganese will accelerate natural rubber aging process. Rubber anti-aging agent can delay the aging time of rubber and prolong its service life. Adding an appropriate amount of rubber anti-aging agent to natural rubber can significantly improve the aging resistance of natural rubber products.

1. Which anti-aging agents can be used in natural rubber products

Rubber anti-aging agent can be used to inhibit the aging of natural rubber products, rubber anti-aging agent RD, anti-aging agent A, anti-aging agent DNP, anti-aging agent 4010, 4010NA, anti-aging agent 4020, anti-aging agent AW, anti-aging agent MB, anti-aging agent SP, SP-C , Anti-aging agent 3100 and so on. In order to obtain better protective effect in actual production, rubber product manufacturers usually use two or more anti-aging agents together, and if necessary, a small amount of physical anti-aging agents such as microcrystalline wax are used.

2. How to choose anti-aging agent for natural rubber products in different occasions

Natural rubber has high chemical activity, and it is easy to combine with oxygen and ozone to cause aging reaction. Heat, light, flexion and deformation, and harmful metal ions will promote aging. Therefore, rubber product manufacturers need to choose the anti-aging agent reasonably according to the actual use and use conditions of the product.

Under normal circumstances, natural rubber products requiring heat and oxygen aging can choose anti-aging agent RD, anti-aging agent A; ozone-resistant rubber products can use anti-aging agent 4010, anti-aging agent 4010NA, anti-aging agent AW, anti-aging agent 3100; light natural rubber Products need to choose non-polluting anti-aging agent, such as anti-aging agent MB, anti-aging agent SP-C, anti-aging agent 264, anti-aging agent 2246, etc.

3. The amount of anti-aging agent commonly used in natural rubber products

The effect and solubility of different varieties of anti-aging agents in natural rubber are very different. When rubber products manufacturers use anti-aging agent 2LLYY526, it is necessary to consider the specific use occasions and performance requirements of the products, and to avoid the occurrence of frost caused by excessive dosage. .

When anti-aging agent RD / A is used to improve the heat-resistant aging properties of natural rubber, the amount of anti-aging agent should be controlled at 1-2; The amount of anti-aging agent can be increased appropriately, controlled between 3-5 parts, if necessary, add 0.5-1 part of microcrystalline wax to further improve the aging resistance of natural rubber.

In the actual application process, the service life of natural rubber products after the addition of anti-aging agents has increased significantly. Due to the historically high prices and large price fluctuations of natural rubber, more rubber product manufacturers have begun to use recycled rubber in natural rubber products. For example, latex recycled rubber can directly replace natural rubber or be used in combination with natural rubber, or use tire recycled rubber in an appropriate amount. Significantly reduce the cost of natural rubber products. Experiments have shown that after the use of regenerated rubber with rubber hydrocarbons in a stable state in the formulation of natural rubber products, the natural aging and thermal aging of natural rubber products are significantly alleviated.