2 Utilization of Waste Polystyrene

Polystyrene can be divided into GPS and EPS, EPS mainly in the form of foam plastic used in televisions, refrigerators, washing machines and other household appliances, precision instruments and crafts shockproof packaging materials. It can also be used in food packaging such as fast food lunch boxes and can also be used as insulation material. Most of these packaging materials are disposable and become waste products when they are used up.

1 Reprocessed recycled polystyrene foam There are two molding methods: one is direct foaming, the other is expandable beads, both methods are physical processes, and do not destroy the polystyrene The structure of the polymer keeps it in its original shape and can therefore be recycled.
Take waste fast food box as an example, the process flow is:
Abandoned snack box→washing→drying→crushing→forced feeding→pre-plasticization→extruded plasticization(with head quick change filter)→molding→cooling→granulation→bagging and granulating conditions are not required, FLS can be used -75 extruder.

2 Production of building cement products The apparent density of waste polystyrene foam is 20 to 25 kg/m3, and the wet density of concrete after processing and mixing is 220 to 270 kg/m3, which is basically equivalent to expanded perlite. The density after drying can also be Greatly reduced, there are no special requirements for the cement blended with it.

The use of waste polystyrene foam as a light building material has a variety of manufacturing methods. For example: Styrofoam particles, cement as a binder, crushed woodwool as a filler, mixed with water, and molded into lightweight lightweight cement partitions at the beginning. It is also possible to combine the plant with Portland cement to form a thin sheet. The mixture of foamed polystyrene and cement is filled with a mixture of foamed polystyrene and cement in the middle of the two layers to make a light solid blockage plate, which is particularly suitable for non-load-bearing walls in buildings.

3 Preparation of paint Polystyrene (GPS) transparency of up to 90%, refractive index of 1  59 ~ 1.60, with it coated in polypropylene, ABS and other plastic for vacuum coating primer, can improve the plastic parts of the plating The height of the membrane. Of course, it can also be used to produce general anti-rust paints and furniture paints. Chloroform, banana water, xylene, dibutyl phthalate, glycerol, rosin-modified phenolic resins, rosin, methyl cellulose, aluminum stearate, and pigments can be used. Operation steps: cleaning, washing, decontaminating and degreasing the collected waste polystyrene plastic (PS); drying, removing the residual moisture from the washed waste plastic (PS), drying, drying or drying; . The washed and dried waste plastics are properly crushed and put into a reaction vessel with a stirrer, and soaked in a proper ratio of phenolic resin, methyl cellulose, rosin and mixed solvent (chloroform, banana water, xylene) for one day. Stir for more than 3 hours after soaking to dissolve them and modify them into a uniform glue-like solution. Drizzle them with glue sticks or sticks. The above colloidal solution was filtered through a 80 mesh copper mesh screen to obtain a qualified modified plastic glue, which can be used for preparing various paints; preparing a color paste. The pigment is selected, added with an appropriate solvent, ground to the required fineness with a ball mill, and then filtered with a 100-200 mesh copper screen to obtain a color paste.

3 Use of Polyolefin Waste Plastics

Polyolefin refers to polyethylene, polypropylene. They are mainly used to produce films, hollow products and plastic woven bags.
1 Recycling of waste polypropylene plastic woven bags The collected waste polypropylene polypropylene woven bags are washed, air-dried, crushed, incorporated into new polypropylene, and wetted with about 10% of low-pressure polyethylene. According to the quality requirement of the woven bag, the blending amount can be 20% to 70%. The use of recycled materials must add a small amount of titanium dioxide and yellow pigment to adjust the color, and incorporate a small amount of recycled material and new grain drawing of the same specification weight. The woven polypropylene plastic woven bags have slight differences in strength but have little effect on the quality of use.
2 Manufacture of calcium plastic plastics In waste plastics such as polyethylene, polypropylene and polyvinyl chloride, a large amount of inorganic fillers can be added to make calcium plastic materials. This high-volume waste plastic has wood-like properties, but its rigidity, wear resistance, and heat resistance are superior to wood. Plastic molding methods can be used to process calcium plastic plastic. Due to the large increase of inorganic fillers in waste plastics, the influence of impurities mixed in waste plastics becomes correspondingly smaller. The advantage of this product is its low price, but its strength and color are far less than the products processed by new materials, and often it can only process black or brown products with little force. Filled inorganic materials should be fine-grained, well-dispersed and well-used, with low water content, and used at a price. Commonly used are light calcium carbonate, talcum powder, three fly powder or four fly powder (natural calcium carbonate) and the waste generated in the production of sulfuric acid (mainly containing titanium oxide).

4 Recycling of waste polyester containers

The development of plastic bottles as packaging supplies is very rapid, and the most important one for large-scale food packaging is the PET bottle (polyethylene terephthalate) or polyester bottle. The material is a plastic saturated polyester, non-toxic and tasteless, suitable for food packaging.

1 Direct recovery, cleaning The use of PET bottles can be recycled like “metal cans” and paper packaging, “resolved” and reused, and can be reused as glass bottles. In the Dutch market in 1989, the first reusable PET bottle was launched. This new PET bottle refilling technology has gradually entered the world market.
There are currently equipment designed specifically for reused PET bottles. First of all, PET bottles are required to withstand temperature, because the method of cleaning PET bottles is the same as that of glass. The concentration of caustic soda is required to be 2% to 3%, and the temperature is 40-68°C.

2 Crushing and recycling Used for crushing and crushing polyester packaging containers, crushing, granulation, re-blow drawing, and post-molding packaging containers, can only be used for non-food packaging. The reason is that the recycled polyester is blown and stretched under high temperature, and some molecules decompose to generate acetaldehyde, while acetaldehyde is toxic, so it can only be used in non-food packaging. Some PET bottles include polyester (PET) bottles, high-pressure polyethylene (HDPE) trays, and aluminum lids, along with vinyl-vinyl acetate (EVA) liners, paper tags, and glue. If it cannot be separated by hand, the crushed pieces can be separated by EVA, paper, PET, HDPE, and AL with a difference in density using a blower and water washing. That is, HDPE is removed by water suspension, and the PET and aluminum are separated by suspending salt solution with a density of 1-4g. The main equipments are: crusher, air separator, flotation device and oven.

5 回收Recycling of Waste Polyurethane Foam

Polyurethane has been widely used in various fields because of its good elasticity and excellent cushioning properties. In addition to artificial leather, it is also used in sofas and automobiles as cushioning materials, refrigerators, underground steam pipe insulation and on-site blister packaging for special occasions. As a result, more and more waste of polyurethane is available.

1. Artificial soils In open-pore flexible polyurethane foams, water and fertilizers are added to cultivate a wide variety of plants, and plants grow fast, free of pests and weeds. This kind of light artificial soil can be used to plant vegetables and flowers in the roof or indoor free space. It can also be used as a nursery box. A certain thickness of foam can be placed in the nursery box and the liquid fertilizer can be added. When the seedlings are cut off, there is less roots and the survival rate is high. This kind of nursery bed is light in weight and can be used for establishment of body cultivation, which does not occupy farmland and is easy to carry.

Polyurethane foam as a natural soil cover mainly protects the surface of natural soil, prevents erosion, heat preservation, and regulates moisture content, thereby promoting plant growth, improving yield and improving soil quality. The use of this type of material makes up for the insufficiency of natural soils and enables water, fertilizers, and nutrients to perform better.

The proportion of 1% of waste polyurethane foam smaller version with a porosity of about 98% is evenly mixed with natural soil, which can make the soil between natural soils have larger pores, form a good ventilation environment, and promote plant growth. It has been reported that 30 to 50 kg of small-diameter polyurethane foam was buried in farmland with poor air permeability in 6700M2, buried deep in soil and 10 to 50 cm in diameter, and plants such as early rice, tobacco, or onion were grown, and the yield could be increased by 10% to 50%. , Good effect for many years.

2 Molded products In addition to the waste polyurethane (PU) made of adhesive material, it can also be used to mechanically cut the polyurethane into small pieces, granulated or ground into a powder, put it in the mold, 200 °C hot pressed into semi-finished or finished products. For example, the waste is crushed to an adhesive ratio of 85:15 and mixed uniformly in a whipper. According to the required weight, a certain amount of this mixture is taken and placed in a mold. The fatigue test can reach 7×104 times at a pressure of 100% to 140%, and the specific gravity is 1.17 g/m 2 . The appearance is smooth and glossy.

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