What Happens to Recycled Plastic Bags?

Overview

Recycled plastic

Overview

Recycled plastic is the recycling of plastics by

Plastic has good processing properties and is easy to form, such as: blown, squeezed, pressed, easy to cut, and easy to weld. There are many plastics in production life

1. World resources will always be a hot topic for human beings. The slogans of saving resources and protecting the environment have gradually penetrated into people s hearts. Plastics will not rot when buried in the ground for hundreds of years, so the awakening of recycling and recycling is inevitable. In this way, people can truly achieve environmental protection and energy conservation through resource recycling. The biggest advantage of recycled materials is that the price is definitely cheaper than new materials. According to different needs, only certain aspects of properties need to be processed, and corresponding products can be manufactured, so that resources will not be lost. Plastic is made from petroleum. Products made of petroleum resources are limited, so recycling recycled plastics can save petroleum resources.

2. Due to the inability of plastics to degrade naturally, it has become the number one enemy of human beings, and has also led to the tragedy of many animals. For example, zoo monkeys, pelicans, dolphins, and other animals all swallow the No. 1 plastic bottle thrown away by tourists, and finally die painfully due to indigestion; when they look at the beautiful and pure sea, when they approach, they are full All kinds of unacceptable

1. When recycling waste plastics, classification is very difficult and economically uneconomical.

2. The heat resistance of plastic is poor, and it is easy to age.

PVC: The discoloration is more obvious after regeneration. It will be light brown after one regeneration extrusion, and almost become opaque brown three times. The specific viscosity does not change at two times, and it tends to decrease more than two times. Regardless of whether it is rigid or soft PVC, a stabilizer should be added during regeneration. In order to make the reproduced product shiny, ABS 1% -3% can be added for regeneration.

PE: After PE is regenerated, its performance will decrease, and its color will turn yellow. After repeated extrusion, the viscosity of high-density polyethylene will decrease, and the viscosity of low-density polyethylene will increase.

PP: During one regeneration, the color is almost unchanged, and the melt index rises. When the color is increased more than two times, the melt index still rises. After regeneration, the breaking strength and elongation decreased, but there were no problems in use.

PS: The color turns yellow after regeneration, so the regeneration PS generally undergoes color difference. The degree of decline in various properties of the recycled materials is directly proportional to the number of regenerations. The breaking strength does not change significantly when the amount is less than 60%, and the limiting viscosity does not change significantly when the amount is less than 40%.

ABS: The discoloration is more significant after regeneration, but when the blending amount does not exceed 20-30%, there is no significant change in performance.

Nylon regeneration also has problems of discoloration and performance degradation, and the blending amount is preferably less than 20%. Regeneration elongation decreases, but elasticity tends to increase.

1. Look at the color:

The lighter the color (even colorless and transparent), the wider the range of use and the higher the level. Such as white, can be adjusted to a variety of other colors, can also be made back to white products, the same price is also high. Secondly, because of the needs of the product, various ingredients are added to the raw materials.

2. Look at CaCO ₃ (stone powder) content

The higher the CaCO ₃ content and the lower the grade, the lower the price. From the naked eye, the product is not bright, and there is more luster (except matt), the content of CaC03 will be more, and it will also feel heavy from the feel. If it is burned with fire, the burned part will turn red and become gray. In addition, we should also pay attention to reinforced (referred to glass fiber) products. The available reinforced products are only PA, PBT, PP, etc., and the prices are not high. There are also several alloy materials. At present, only ABS + PC is available in China. According to the specific gravity (density) of the raw materials, it can be judged whether the intermixed materials can be reused. At present, the most common problems are the intermixing of ABS and PS, the intermixing of PC and PMMA, the PVC sheet (bottle material) and PEl, and the interplay Mixed, PE and PP are mixed with each other. After mixing these materials, the density is similar and it is difficult to use.

3. Look at the properties of recycled plastic materials

The more pure the material, the higher the grade; the less pure the material, the lower the grade, and some intermixtures are not even required.

4. Difference from waste plastic

Waste plastic is directly crushed into powder or granules, and it can still distinguish what kind of material, such as injection molding, wire drawing, film, etc. The recycled material is recycled and I don't know how many times I can't tell what is accurate. I can only divide the grade according to the number of cycles. At the very least, the super, first and second grades are divided.

Evaluation of the price of recycled plastics 1. Color and performance of recycled plastics Generally speaking, the lighter the color of recycled plastics, the better the price. The closer the performance is to the new material, the more ideal the price. The better the key performance indicators, the better.
2. Purity of recycled plastics The higher the purity of recycled plastics, the more ideal it is, except for modified materials, because the modified materials mainly depend on the performance indicators; the compatibility of each component in the recycled materials can also be included in this, the better the compatibility The higher the price.
3. The appearance of recycled plastic depends on the shape of the pellets. The better the shape of the pellets, the higher the price. The second is to see if it foams, delaminates, whether the hardness meets the requirements, whether the color is uniform, and the gloss is good. .
4, the application of recycled plastics The use of recycled plastics, processing characteristics, breadth of application, and other special requirements will affect the valuation of recycled plastics. ^[1]