ABS Resin Production Process

From the perspective of environmental protection and investment, the ontology method is the best ABS production process. The main disadvantage of the ontology method is that the products produced have limitations, such as limitations in the production of high-impact products.

The bulk process is different from the emulsion process. The emulsion process is carried out in the water phase, the viscosity of the reaction system is low, and the heat transfer is better. When the ABS resin is produced by the bulk process, in order to easily control the viscosity, the rubber content is controlled within 15%, at most No more than 20%, and the rubber particles in the ABS resin produced by the ordinary bulk process are larger, so the surface gloss is poor. Most bulk processes use a reactor system with 3-5 continuous reactors connected in series. The reactors can be stirred tank, tower, tubular or combined. The main progress made by the bulk process in improving products are as follows:

(1) Control the particle size of the rubber to be less than 1.5μm and improve the gloss;

(2) Control the particle size and shape of rubber to improve impact resistance;

(3) Increase the amount of attachment in the rubber phase;

⑷ Make the rubber particles bimodal distribution;

⑸ Preferred initiator type and concentration, etc.;

⑹ Introduction of the fourth monomer modification: such as the introduction of α-methyl styrene to produce heat-resistant ABS resin.

For the above two ABS production methods, the total variable cost of the bulk process and the emulsion graft bulk SAN blending process is the same when the production device with an annual output of 50,000 tons produces ABS resin with a rubber content of 15% (wt). The total cash cost is lower for the bulk process. If in order to produce high rubber content ABS products with good impact resistance, bulk ABS producers must either purchase rubber grafted concentrates or produce their own concentrates for bulk ABS blending, which has actually The bulk process was transformed into an emulsion-grafted bulk SAN blending process. Therefore, only a few companies use the continuous bulk process to directly obtain ABS resin products, and most of them still use the emulsion graft bulk SAN blending method to produce ABS resin.