Waste PVC Recycling Formula Box Filter Ningbo Ifilter Purification Equipment CO.,Ltd. , https://www.ifiltor.com
1. Intuitive identification of sorting technology The following methods can be used for the classification of waste plastics in a small quantity: First, the metal, glass, string and other debris and serious pollution of waste plastics removed; Second, the agricultural film, packaging film, foam Plastics and plastic bottles are categorized; third, they are classified according to the color shade of the products; fourthly, the commonly used polyvinyl chloride, polystyrene, polyethylene, polypropylene and other plastics are used for simple methods such as visual inspection, feel, specific gravity, and burning. classification.
2. Density sorting technology Various plastics have different densities. Different kinds of plastics are placed in a specific solution, and the plastics are classified and identified according to the ups and downs of the plastics in the solution. Because plastics are not wettable, they need to be pretreated with surfactants, wetted and then sorted. Commonly used identification plastic solutions are water, saturated salt solution, alcohol solution and calcium chloride solution.
3. The solution sorting technology uses a variety of plastics in the organic solution to achieve the separation of waste plastics according to the difference in solubility. The method is to add waste plastic chips to a specific solvent, control different temperatures, and selectively dissolve and sort various plastics. This technology has less solvent loss, and the recovered polymer can be reused after being heated and granulated, and its performance is good.
4. Wind screening technology When the amount of waste is large and there is a lot of debris, wind filtration technology can be used. In this method, the crushed waste plastic is put into the re-screening chamber from above, air is injected from the horizontal direction, and the weight of the plastic and the difference in air resistance are selected.
5. Electrostatic Separation Technology Electrostatic separation technology originates from the dry separation method. It is characterized by the separation of particulate matter with a diameter of less than 8 mm regardless of its density. Its size and shape do not affect the separation, and it has low energy consumption and a large amount of processing.
Second, the recycling of plastic packaging waste Plastic packaging waste has great harm to the environment and society, so its recycling is particularly important, generally can use the following ways: manufacturing of building materials, manufacturing of general supplies, production of chemical products, cracking gas , oil, and units are burned together with other garbage for heat recovery (steam, hot gas, and power generation).
1. Recycling of Waste Polyvinyl Chloride Polyvinyl chloride in plastic products in China accounts for more than 30%. The recycling of waste PVC is mainly to directly recycle or supplement appropriate new materials and to re-make various products. When these recycled materials are dirty and can no longer be used for other products, they can still be used for infrastructure and water conservancy products (pipes, tanks, belts, plates, etc.).
1 Direct reuse of recycled PVC recycled recycled products should be based on different types of additives added to meet the requirements. The formula is shown in the table below.
10.0
5.0
1.0
0.8
0.2
- 100.0
-
-
1.5
1.0
0.2
- 100.0
5.0
5.0
0.5
1.0
0.2
6.0
The composition of PVC is more complex. In addition to the resin, there are a certain amount of auxiliary materials such as plasticizers, stabilizers, lubricants, and pigments. During the use of these additives, due to light and heat, there will be different degrees of volatilization and loss. In the process of copying, it is necessary to make an appropriate amount of supplements so that after the polyvinyl chloride waste plastic is replicated, better physical performance can be maintained.
2 Asphalt mat and plastic ointment The waste polyethylene plastic and coal tar are reacted in a reaction vessel. In the presence of a catalyst, naphthoquinone, such as naphthoquinone in the coal tar, tends to have a relatively low degree of aggregation with the chain-like polyvinyl chloride. Molecular reaction produces cross-linking, forming a two-dimensional network structure, so that the modified tar pitch softening point increases. Its performance is better than that of general petroleum asphalt felt and tar asphalt felt, especially low temperature resistance, and is particularly suitable for construction use in northern regions. Its specific operation: adding asphalt in the enamel reaction kettle, electric stirring with 150 ~ 200r/min, and heated to 150 ~ 170 °C under the reaction for 3h, then add the filler, stir for a moment to get the electric modified tar pitch.
Basic formula: tar 100, waste PVC plastic 12 to 15, plasticizer 29 to 32, filler 30 to 50.
2. Utilization of Waste Polystyrene Polystyrene is mainly used in the form of foam plastics for shockproof packaging materials such as TVs, refrigerators, washing machines and other home appliances, precision instruments and handicrafts. It is also 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, and the other is expandable beads. Both of these methods are physical processes that do not destroy the polystyrene polymer structure, leaving it still maintaining its original properties. Therefore can be recycled. Take the discarded snack 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 Wasted polystyrene foam has a surface density of 20 to 25 kg/m3. After processing and mixing, the concrete has a wet density of 220 to 270 kg/m3, which is equivalent to the expansion of rare ball rock. The density after drying can also be achieved. 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 plant fibers with Portland cement to form a thin sheet. A mixture of styrofoam and cement is filled in between the two sheets to make a lightweight solid wall panel, which is particularly suitable for use as a non-load-bearing wall inside and outside a building. .
3 Preparation of paint Polystyrene transparency up to 90%, refractive index 1.59 ~ 1.60, coated with polypropylene, ABS and other plastics for vacuum coating primer, can increase the height of the plastic coating film, 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. The collected waste polystyrene plastic (PS) is cleaned, decontaminated, deoiled and dried. After washing the waste plastic (PS) to remove the remaining water to dry, dried or dried for preparation. The washed and dried waste plastic is properly crushed and put into a reaction vessel with a stirrer, and immersed for one day by adding a proper ratio of phenolic resin, methylcellulose, rosin and mixed solvent (chloroform, banana water, xylene). After soaking for more than 3 hours, it is dissolved and modified into a uniform glue-like solution, and the glue solution put in the stick is dripped and filtered in a linear manner. The above colloidal solution is filtered through a 80 mesh copper screen to obtain a qualified modified plastic glue, which can be used for manufacturing various paint color pastes. 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. The use of polyene polyolefin waste plastics, refers to polyethylene, polypropylene. They are mainly used to produce films, hollow products and plastic textile bags.
1 Reuse of waste polypropylene plastic woven bags The collected waste polypropylene polypropylene woven bags are washed, air-dried, crushed, incorporated into new polypropylene, and mixed with about 10% of low-pressure polyethylene. According to the quality requirements of woven bags, the blending amount can be 20-70%. Use recycled materials to add a small amount of titanium dioxide and yellow pigments to adjust the color. The incorporation of a small amount of recycled materials has a slight difference in strength but has little effect on the quality of use, compared to the polypropylene woven bags that are woven with new materials of equal weight and other specifications.
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 will not change accordingly. The advantage of this product is its low price, but its strength and color are far less than the products processed by the new materials, and often it can only process black or brown-red products with little force. Filled inorganic materials should have fine particle size, good dispersion, low water content, and low price. Commonly used is light calcium carbonate, talcum powder, two fly powder or four fly powder (natural calcium carbonate) and the waste generated when the production of sulfuric acid (mainly containing iron oxide) and so on.
4. Recycling of waste polyester containers The development of plastic bottles as packaging products has been extremely rapid, and PET bottles have been used on a large scale for food packaging. The material is a plastic saturated polyester, non-toxic and tasteless, suitable for food packaging.
1 Direct recycling and cleaning PET bottles can be reused as metal cans and paper packaging, recycled and reused as glass bottles. In the Dutch market in 1989, the first new technology for recyclable PET bottles was introduced into 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 2-3%, 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, aluminum caps, vinyl-vinyl acetate copolymer (EVA) liners, paper tags, and glue. If it cannot be separated manually, the crushed pieces can be separated by EVA, paper, PET, HDPE, and Al in a density difference using a blower and water washing. That is, the HDPE was removed by water suspension, and the PET and aluminum were separated by suspending the salt solution having a density of 1.4 g. The main equipment is: crusher, air separator, flotation device and oven.
5. Recycling of waste polyurethane foam Because of its good elasticity and excellent cushioning properties, polyurethane has been widely used in various fields. 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. Therefore, the waste of polyurethane is also increasing.
1. Artificial soils In open-celled flexible polyurethane foams, water and fertilizers are added to cultivate a wide variety of plants in which plants grow fast, free of pests and weeds. Can also be made into nursery boxes, a certain thickness of foam, according to the required size, into the nursery box, add liquid fertilizer, cut roots when transplanting less, the survival rate is high, this nursery bed light weight, can be set up to establish planting It does not occupy farmland and is easy to carry.
Polyurethane foam as a natural soil cover mainly protects the surface of natural soil
First, sorting technology of plastic packaging waste Plastic packaging waste can be separated from other garbage by artificial or mechanical (gravity method), and then use intuitive identification, combustion identification, specific gravity identification, solvent separation, wind screening, Electrostatic separation, low-temperature crushing and other methods.
Materials Soft Rigid Flexible Foam Plastic Waste Polyvinyl Chloride Plastic Dibutyl Phthalate Alkylbenzene Sulfonate Tribasic Lead Sulfate Stearic Acid Stearate or Paraffin Azodicarbonamide 100.0
December 23, 2023