The recycling of PET plastic bottles can not only solve environmental problems, but also realize resource recycling, and alleviate the contradiction of insufficient PET raw materials in my country. At present, the recycling rate of PET plastic bottles in my country has reached almost 100%. The development of recycling technology is also very rapid.
The recycling of PET bottles is divided into physical recycling and chemical recycling. Among them, physical recycling accounts for the main part, the production of PET bottles is large, and the viscosity of bottle-grade PET is high, which is easy to degrade and use.
The physical recycling process of PET bottles: first separate the PET bottle body from the cap, label, etc., then crush the PET bottle body, wash and decontaminate, and then dry it. The dried sheet can be processed or processed according to the purpose. After modification, it is processed into various products. China Plastics Machinery Research Institute specializes in the development and production of PET bottle flake cleaning equipment and PET bottle flake recycling pelletizing equipment.
can generally be used for plastic packaging, fiber, glass fiber reinforcement, plastic modification, woven products, etc. In this way, the secondary utilization of PET bottles is realized.
Bottle-to-bottle recycling
The material properties of the PET bottle remain good after use. Under the condition of ensuring that the impurities and moisture are qualified, the PET bottle flakes can be directly used to manufacture plastic bottles for packaging liquid pesticides, engine oil, chemical reagents, etc.
PET bottles undergo physical changes, their hygiene conditions will change. In our country, it is generally not directly usable for food packaging materials. In the United States and Europe, high-quality PET sheets can be directly reused in food packaging such as water and beverages.
In the recycling process, PET material will be degraded when heated, and its viscosity will be lost to a certain extent. If the chain extension or bulk thickening technology is introduced during the processing, the bottle-to-bottle technology will have more advantages.
spinning fiber
At present, the main purpose of cleaned and dried PET bottle flakes is to make polyester staple fiber. The main reason is that the intrinsic viscosity of the PET resin used as the fiber is not high. Even if a small amount of molecules are hydrolyzed or Degradation will not affect the spinning process to obtain the desired product.
Polyester staple fiber can be used to produce hollow fillers, geotextiles, felts, carpets and other materials and products for clothing, mattresses and plush toys.
Regrowth silk is a small and medium category of recycled chemical fiber. It can produce velvet fabrics with low quality requirements, or make bottom silk in the field of circular knitting machines. It produces elastic bands, curtains, sofas, blankets, carpets and other products.
polyester masterbatch
Polyester staple fiber products are mostly white, but they often need to be dyed when making clothing. Using PET bottle flakes as color masterbatch is better than brand new fiber-grade PET resin chips, because its intrinsic viscosity is slightly reduced during the processing process and will not affect the dispersion performance and addition effect of the color masterbatch, and more use of spinning processing technology The requirements for production costs are more obvious.
modified plastic
Recycled PET can be blended with other polymers to make various modified materials.
PET/PE alloy
It has many advantages such as hardness, high strength, easy processing and low cost. Its brittleness is lower than pure PET, and it does not need to be dried before processing. This alloy has good fluidity and a faster cooling rate than HDPE, which is beneficial to shorten the cycle of molded products. The key to the production of PET/PE alloy lies in the selection of compatibilizers. At present, 3 companies in Europe have successfully developed and put into the market.
Nano-layered silicate modified high-barrier PE: It can greatly improve the barrier properties of PET, reduce oxygen permeability, and significantly improve the strength and heat resistance of PET. It can be used for the processing of engineering plastics such as reinforcement, enhanced flame retardancy, toughening, and low warpage. It can also be used for the processing of PET packaging bottles and films with high barrier requirements.
PET generally cannot be directly injection molded, but it can be processed by injection molding after it is made into glass fiber reinforced, wood-plastic and other composite materials. Used to make a variety of home appliances, automobiles, computers and other parts, with good performance
glass fiber reinforced material
PET generally cannot be directly injection molded, but it can be processed by injection molding after it is made into glass fiber reinforced, wood-plastic and other composite materials to make a variety of home appliances, automobiles, computers and other parts.
Recycled PET reinforced by glass fiber has good heat resistance and mechanical strength. For example, heat-resistant automobile wheel covers have a thermal distortion temperature of 240 degrees, a flexural modulus of 9500MPa, a bending strength of 214 MPa, and an impact strength of 15kf/ m2.
plastic woven bag, cloth
Recently, the research and development of processing and manufacturing plastic woven bags, strapping tapes, and cloths using PET bottle flakes as raw materials has become active. Processing technology and equipment have gradually matured. Entrepreneurs and experts in the industry who are concerned about this project have placed great importance on this use. I hope that the application of PET bottle flakes in this field will promote the upgrading of plastic woven products and open up a new era of plastic woven products.