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Flame retardant ABs plastic: ABS production process and common questions

Time: 2018-07-25 14:02 Author: admin Hits: Times

ABS is commonly known as acrylonitrile-butadiene-styrene, also known as styrene-butadiene-styrene resin, which is formed by copolymerizing acrylonitrile-butadiene-styrene-trimer. It is one of the five main synthetic resins. Its excellent impact resistance, high rigidity, oil resistance, low temperature resistance, chemical resistance and electrical properties, as well as easy processing and low price, are widely used in electronic appliances, instruments, automobiles, construction and other fields. G materials industry, machinery and other fields. After these products were scrapped, a large amount of ABS plastic was produced. Therefore, ABS waste is also hidden in a lot of business opportunities.

Recycling ABS production process

1. The sources of ABS waste are computer cases, TV cases, instrument cases, car panels, and decorative materials. Therefore, the first step is to separate the waste materials, especially the materials for electroplating and painting.

2. Wash in the cleaning tank, then go to the sun, color matching or put auxiliary materials, the purpose is to improve the quality.

3. Chemical treatment, de-plating, and de-painting, but the de-plating and de-painting must be done carefully, because chemical potions have a certain proportion, protective equipment and containers must be used, otherwise it will cause injuries and other events.

4. The pellets are either cold water pellets or air-cooled pellets. The pellets are standard, 3X4mm, and then labeled for packaging.

5. Dedicated extruder must be placed on the filter screen to pelletize, but the filter screen is placed according to the product requirements.

Nine regenerating ABS FAQs

1.What are the main factors of ABS aging?

ABS is affected by a variety of factors in the natural environment. Oxygen is the main factor causing ABS aging. Light and heat can accelerate the aging of ABS, and the effect of light is slightly stronger. ABS is extremely susceptible to yellowing during natural atmospheric exposure. The yellowing of ABS is mainly because the isolated double bond of polybutadiene in the structure is subjected to the action of oxygen to generate hydroperoxides and trigger the degradation of the SAN phase, so that chromophores such as carbonyl groups are formed on the molecular chain. The energy of light is inversely proportional to its wavelength. The shorter the wavelength, the greater the energy. Comparing the dissociation energies of various organic compound bonds with the ultraviolet light energy in sunlight, it can be seen that ultraviolet light can cause aging and degradation of polymer materials.

2.What is the difference between ABS material and ASA material? Can it be mixed?

The full name of ASA material is acrylonitrile-styrene-acrylate terpolymer. The only difference from ABS is that the rubber component is acrylic rubber instead of butadiene rubber. As the ASA material has better thermal stability and light stability than the ABS material, it has replaced the use of ABS in many places with high aging requirements. These two materials are compatible to a certain extent and can be directly mixed into particles.

3.Why is it difficult to separate ABS and HIPS?

4.How to deal with ABS plating material to ensure the quality of the material?

At present, there are mainly two methods: one is to crush and electroplated ABS parts and directly melt extrusion, and filter these plating layers by using a high mesh filter. Although the original properties of the material are retained to a certain extent, this method requires high frequency filter replacements. At the same time, because the filtering effect of the filter is always limited, some of the plating components in the final product are always retained in the resin, which affects the later injection molding effect.

The second method is to use different thermal expansion rates of metal and ABS. After the electroplated parts are heated under a certain temperature to soften and deform the ABS resin, the electroplated layer is peeled off from the ABS resin. The biggest disadvantage of this method is the low working efficiency, and because of the long baking time, the physical properties of ABS resin will also be damaged. In recent years, efforts have been made to develop low-pH solution soaking methods, but the results are not ideal. The obvious effect is to dissolve the electroplated layer in a neutral or acidic solution to obtain the deplated ABS by replacing the metal in the electroplated layer.

Recycled plastic ABS production process and common problems

HIPS and ABS have the same shrinkage rate, and the plastic parts produced have basically the same appearance of ABS, so without the need to modify the injection mold, you can directly use the molds for ABS parts to produce HIPS plastic parts , There is a considerable overlap between the two uses. Pure ABS and HIPS have similar densities and no significant difference in charge, and conventional sorting methods cannot separate them.

5.What should I pay attention to when crushing and planing granulation of ABS sheet?

The viscosity of the ABS board material is higher than that of ordinary ABS materials. Care should be taken to appropriately increase the processing temperature during processing. In addition, due to the low bulk density of the board planer, it needs to be dried before processing, and it is best to have a forced compression feeding process during processing to ensure the quality and output of the product.

6. Foaming often occurs in light-colored flame-retardant ABS granulation. How should the color be grayed out?

This situation often occurs when the temperature of the melt extrusion equipment is not well controlled. Common flame retardant ABS has poor heat resistance. During the secondary recovery, if the temperature is not controlled properly, it will easily decompose and cause foaming and discoloration. This situation is usually solved by adding a certain thermal stabilizer. Common types of additives are stearates and hydrotalcites.

7. What is the reason for the delamination phenomenon after ABS granulation and toughening agent?

For the toughening of ABS, not all common toughening agents on the market can be used. For example, SBS (poly [styrene-butadiene-styrene] triblock copolymer), although SBS has the same structure as ABS, the compatibility of the two is not ideal. A small amount of addition can improve the toughness of ABS materials to a certain extent. However, if the addition ratio exceeds a certain level, layering will occur. It is recommended to consult your supplier for a matching toughener.

8. What should I do if the problem of water spray always occurs during injection molding of ABS recycled materials?

ABS material injection occurs mainly because the moisture in the ABS material is not fully dried. Exhaust gas in the granulation process is the main reason for the material not drying. ABS material itself has a certain water absorption, but these moisture can be removed by hot air drying. However, if the regenerated particles do not get a good exhaust during the granulation process, it is likely to retain the moisture remaining inside the particles.

It takes a long time to dry this moisture. If ordinary drying procedures are used, naturally the materials will not dry. To solve this problem, it is still necessary to start from melt extrusion granulation, improve the exhaust conditions during the melt extrusion process to avoid residual moisture inside the particles.

9. What is high-gloss ABS and what should be paid attention to when recycling?

Glossy ABS is essentially a component that introduces MMA (methacrylate) into ABS resin. Because the gloss of MMA is much better than that of ABS itself, and its surface hardness is also higher than that of ABS. Particularly suitable for thin-walled large-scale products such as flat-panel TV panels, high-definition TV panels and bases. At present, the quality level of domestic high-gloss ABS varies, and the toughness, gloss and surface hardness of materials need to be paid attention to when recycling. Generally speaking, materials with high flow, good toughness and high surface hardness have higher recycling value.

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