Introduction to specific knowledge of classification and identification of waste plastics
There are many varieties of waste plastics, and there are many forms of patterns, which come from different industries. Plastics can be divided into thermoplastics and thermosets according to their structure and properties. At present, most of the products that can be recycled in China are thermoplastics because they are soluble and plastic.
Different sources of waste plastics result in different degrees of utilization of waste plastics and different prices. The first is the color, the lighter the color (even colorless and transparent), the wider the range of use, such as white, can be adjusted into a variety of other colors, can also be used as a white product, the same price is also high. Secondly, because of the needs of the product, various ingredients are added to the raw materials.
At present, from the domestic market, the main content of CaC03 (stone powder) determines the utilization value of waste plastics. The more CaC03 content, the lower the price. From the naked eye, the product is not bright, dull (except matt), the CaC03 content will be more, and it will feel heavy from the hand. If it is burned with fire, the burnt part will turn red and become gray. In addition, we must pay attention to the enhancement (referring to glass fiber) products. At present, the enhanced products that can be utilized are only Pa, PBT, PP, etc., and the price is not high. There is also a kind of alloy material. At present, there is only one kind of aBS+PC in China, and the others are not. According to the specific gravity (density) of the raw materials to judge whether the mixed materials can be reused, the most problematic is the aBS and PS intermixing, PC and PMMa intermix, PVC flakes (bottle) and PEl'' flakes Mutual mixing, PE and PP are mixed with each other. After mixing these materials, the density is similar and it is difficult to separate them by common methods. Therefore, the mixed materials cannot be crushed materials, otherwise the price will be very low, even no one. want.
Generally, the following steps are taken to identify waste plastics: 1. Look at the color; 2. Look at the brightness (the transparent material can be removed in this step); 3. Touch (feel the weight, feel the smoothness); 4. Light up (view whether the flame color is taken Smoke, whether it contains burning from the fire or not burning at all); 5, smell (various plastic flavors are different, including flame retardants, etc.); 6, drawing (CaC03 more drawing is certainly not good, enhanced can not pull out wire).
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