Introduction to ABS Plastic Recycling

Ⅰ. Chemical properties of ABS plastic recycling

1. General properties

ABS plastic is non-toxic and tasteless, easy to color, high gloss. the relative density of ABS is 1.03-1.05g/cm, shrinkage rate of 0.3%-0.8%, ABS and other materials (such as: paints and coatings, etc.) have good adhesion, and it is easy to surface printing. ABS is a flammable material, the color of the burning flame is light yellow, accompanied by a lot of black smoke, the smell of burning It is cinnamon flavor.

2. Mechanical properties

High impact strength; tensile strength is greater, nearly invisible change; but the bending strength is low. ABS plastic is more wear-resistant, the loss is very small, injection molding ABS plastic dimensional stability is good, generally after injection molding ABS in non-specific conditions, will not deformation. ABS plastic as a bearing will not break the problem, can reflect the ABS plastic oil resistance is good. ABS plastic creep better than PC but inferior to PA.

3. Thermal properties

ABS melting point is within 220℃-240℃, ABS plastic can maintain good performance at low temperature.

4. Electrical properties: ABS plastic has good insulation, almost unaffected by external conditions in the process of use.

5. Environmental impact

ABS plastic is only soluble in ketones, aldehydes and chlorinated hydrocarbons, and is not affected by water, salts, acids and bases, so it can be widely used. But the disadvantage of ABS is easy to aging in thermal oxygen conditions, ABS after a period of time, the material molecular weight and strength are reduced, resulting in ABS plastic recycling wABS can not be used directly, so this needs to be processed and modified, as long as the performance to achieve similar to the new material is very research significance.

Ⅱ. The use of ABS plastic recycling

The traditional methods of recycling plastics, such as landfilling and incineration, have been abandoned. The reason is that landfill is a simple and brutal way to disassemble and recycle plastic products, the excess waste directly to landfill, heavy metals in the waste ABS into the environment, the damage to the environment will take a long time to repair, incineration of waste plastics will produce dioxin and furan, etc., when incomplete combustion, more harmful. Environmental pressure can be relieved if used plastics are used resourcefully.

Plastics are sourced from oil and natural gas, and can be treated by cracking catalytic methods for waste plastics. Waste plastics are first cracked into small molecules that can be used as energy. The disadvantage of this method is that the plastic composition is complex, and various additives such as oxidizers and fillers make it difficult to crack the plastic into single small molecules with low efficiency.

Nowadays, ABS is modified mainly by co-blending modification, that is, elastomer or inorganic filler is added to the waste plastic, which improves the performance of the waste plastic. Elastomer is widely used in plastic modification as a modifier with excellent performance. The content, particle size, dispersion ease and compatibility of elastomer will affect the modification effect of ABS plastic recycling. Among them, elastomer content, chemical structure and particle size have the most obvious effect on the mechanical properties of the material.

In general, low glass transition temperature (TG) elastomers are more likely to achieve toughening effects, and good compatibility is a must for elastomers. Elastomer toughening of ABS is well established in theory and practical applications. By adding three modifiers, POE, TPU and ABS high rubber powder, respectively, to ABS on the mechanical properties of ABS composites, where SMA is the compatibilizer.

The tensile strength of ABS/SMA was increased and the comprehensive mechanical properties of ABS/SMA/ABS high adhesive powder composites were more satisfactory. ABS high adhesive powder was used to toughen and modify the waste ABS, while PMMA and AS with higher surface gloss and better compatibility with ABS were selected for synergistic modification. The toughness of the composites decreased and the strength and hardness increased, in which the PMMA system was better than that of AS.