Rubber Chem Encyclopedia

The role and adding skills of 10 common carbon blacks in reclaimed rubber (1)

Create Date:2019-10-08 08:33:02Click volume:218
The role and adding skills of 10 common carbon blacks in reclaimed rubber (1)

The price of reclaimed rubber is much lower than the original rubber price, retaining the basic performance characteristics of the original rubber, plasticity, fluidity, compression and permanent deformation resistance, vulcanization flatness is better during vulcanization, and the vulcanization reversal is smaller; but in actual production Recycled rubber is not "360 degrees without dead angle". The mechanical strength is lower than the original rubber is its "short board"; therefore, when using recycled rubber to produce rubber products with high mechanical strength, rubber products manufacturers need to use physical properties better. Recycled rubber, on the other hand, through carbon black to improve the mechanical strength of the rubber 1JLYY108.

At present, there are many kinds of carbon blacks on the market, and different types of carbon black have irreplaceable functions in reclaimed rubber. The following 10 kinds are common.

1 Natural gas tank black: The carbon black produced by natural gas has two kinds of furnace black and tank black. The natural gas tank black is produced in excess air, and the surface contains a large amount of acidic functional groups. It is fine particle acidic carbon black in the production process of recycled rubber products. It is easy to adsorb accelerator and delay vulcanization. It takes a long time for the natural gas tank black to be uniformly dispersed in the reclaimed rubber, which affects the extrusion speed of the rubber compound. Therefore, the blackening of the recycled rubber product is usually used together with other types of carbon black, and the regeneration is significantly improved under the premise of ensuring the normal production of the product. The strong stretchability, wear resistance and tear resistance of the rubber vulcanizate.

The black carbon absorption rate of the channel black is high, and it will cause air pollution in the production process. Therefore, considering the economic and environmental aspects, the application of the groove black in the rubber product industry is far less than that of the furnace carbon black.

2 Aeration tank carbon black: Compared with natural gas tank black, this carbon black has a coarser particle size and a slightly higher structure. The processing technology in the reclaimed rubber is better than that of the natural gas tank, but the reinforcing effect on the reclaimed rubber. The reinforcing effect is lower than that of the natural gas tank black, and the performance is basically the same as that of the natural gas tank black.

3 General carbon black: typical soft carbon black, generally processed by oil furnace method, its particle size is small, between 49-60nm, the structure is slightly higher, and the dispersion is good in reclaimed rubber. The proper amount of general carbon black is filled in the production process of reclaimed rubber products, which can significantly improve the tensile strength, modulus, resilience, flexural flexibility, etc. of the reclaimed rubber vulcanizate. The produced rubber products are deformed during storage and use. Small, low heat. It should be noted that the reclaimed rubber vulcanizate prepared by adding general carbon black has a low elongation at break, so that reclaimed rubber products with strict requirements on elongation at break should avoid the use of general carbon black.

When using recycled rubber to produce rubber products, carbon black products such as high wear-resistant furnace black and medium-super wear-resistant furnace black can significantly improve the mechanical strength of the rubber, but the role of these carbon blacks in reclaimed rubber is not only that, tomorrow Xiaobian and you Share the effect of hard carbon black in reclaimed rubber.