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Matters needing attention in ABS plastic modification

Time : 2023-07-11 Hits : 8

Control of the processing when ABS comprises other materials

ABS is made up of PC, PBT, PMMA, AS, etc. Making PC/ABS alloy, ABS modifications, etc. is rather simple. It should be noted that ABS contains HIPS, which makes it difficult to make secondary materials, hence PVC/ABS alloy cannot be produced. The material's relative brittleness is the key cause. To create PC alloys, you may want to think about using an appropriate phase solvent; ABS includes PET or low-temperature PET (PCTA), which is problematic for producing secondary materials. It is not advised to purchase this sort of material for alteration plants because it is somewhat brittle and the impact of adding toughening chemicals is not readily apparent.

Choosing and Managing Additives for Modifying Regenerated ABS

It is advised to utilize relatively pure ABS for the more PVC/ABS alloys that are now produced, and to alter the additives in accordance with the toughness and associated qualities;

The performance and fire resistance requirements of the material must be taken into account when deciding whether to add tougheners and fire-resistant chemicals during the re-granulation of fire-resistant ABS recycled materials. The processing temperature is also properly lowered concurrently;

Use toughening agents, such as high rubber powder, EVA, elastomers, etc., for ABS toughening in accordance with its physical characteristics and specifications;In order to create materials that satisfy the specifications, additives that are appropriate can be chosen when compounding PMMA, PC, AS, PBT, and other materials to create high-gloss ABS;

It is advisable to add materials, such as glass fiber and associated additives, to the manufacturing of ABS fiber rather than merely processing certain ABS recycled fiber materials, since this would significantly diminish the physical qualities.

For ABS/PC alloy, the primary considerations for this sort of material are selecting the proper PC viscosity, the proper phase solvent, the type of toughening agent, and a suitable combination.

Coupling Agent Of ABS

FAQ overview

Why is one side of the ABS material yellow and the other white, and why is the ABS material broken?

The prolonged exposure of ABS materials to sunlight is the major cause of this. Because long-term sunlight exposure and heat oxidation will progressively break down and discolor the butadiene rubber (B) in the ABS material, the color of the material will generally turn yellow and black.

What aspects of ABS board granulation—crushing and shaving—should be carefully observed?

Since the viscosity of ABS board material is higher than that of regular ABS material, care should be taken to raise the processing temperature to the proper level when processing. Board shavings must also be dried before processing because of their low bulk density, and forced compression feeding is the optimum processing method to guarantee product quality and output.

What should I do if drying and splashing are persistent problems during the injection molding process using recycled ABS materials?

The moisture in the ABS material has not completely dried, which is the major cause of the water splash during injection molding. The major cause of the material not drying is the exhaust produced during the granulation process. Although the ABS material itself has some water absorption, the water may be dried off using hot air. However, it is likely to retain the moisture still present in the particles if the regenerated particles are not sufficiently depleted throughout the granulation process.

These wetness don't dry for a very long period. The material won't naturally dry if the standard drying technique is used. Starting with melt extrusion granulation and improving exhaust conditions during melt extrusion are required to address this issue in order to prevent residual moisture inside the particles.

Gray foaming is frequently seen in the granulation of light-colored flame-retardant ABS. How do you handle it?

When the melt extrusion equipment's temperature control is subpar, this condition frequently arises. The flame retardant components of the widely used flame retardant ABS have low heat resistance. If the temperature is not correctly managed during secondary recycling, it is simple to degrade, leading to foaming and discolouration. A specific heat stabilizer is typically added to this scenario to resolve it. Stearates and hydrotalcites are the two most used forms of additives.

What causes delamination following the toughening agent and ABS granulation?

Not all commonly available toughening chemicals can be used to toughen ABS. For instance, while having the same structure as ABS, SBS (poly[styrene-butadiene-styrene] triblock copolymer) and ABS do not mix well. The toughness of ABS material can be somewhat increased by a slight addition. However, stratification will be place if the addition ratio rises above a particular point. For coordinating tougheners, suppliers should be consulted.


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