Through the research on the formulation system and environmental coordination of inorganic powder modified plastic environmentally friendly materials, the feasibility of improving the comprehensive performance of plastic materials and protecting the environment, including incineration, landfill or recycling, is explored. With superiority. Explain that the use of inorganic powders instead of polymer materials is not an expedient measure, not just to reduce costs, it is a cause of shading and children, benefiting society, saving resources, and protecting the environment.
The use of inorganic powders for plastic filling modification has improved from a single cost reduction to improving certain aspects of plastic materials or imparting new functions. The environmental coordination of inorganic powder-modified plastics is conducive to industrialization.
1 reduce the amount of synthetic resin used
China's oil self-sufficiency rate is less than 60%. Oil is a non-renewable resource on the earth. Using less synthetic resin is to save the earth's non-renewable resources. According to actual calculations, PE plastic bags that can produce 1.5kg of 1.5kg items use synthetic resin Pel.5 tons, while PE plastic bags with 30% calcium carbonate need only 1.05 tons of polyethylene. If 30 million tons of inorganic minerals are used in the production of 3 million tons of packaged plastic bags nationwide, at least 700,000 tons of synthetic resin can be saved, and less synthetic resin that is not easily degraded in nature can be used to meet the "white pollution" of plastics. The principle of reduction.
On the other hand, the energy consumed by the collection and processing of inorganic minerals is far lower than the exploitation and processing of petroleum. Therefore, the use of inorganic mineral powders derived from nature and returning to nature instead of petroleum-based synthetic resins is an environmental The contribution of protection.
2 does not increase the inorganic powder in chemical oxygen demand of water
The CODcr value of the starch-containing 5% biodegradable PE film is 96, and the CODcr value of the photo-calorie-friendly PE film containing 15% inorganic powder has a value of 0. It shows that after the plastic is buried, the inorganic powder will not pollute the groundwater when it returns to nature.
3 Inorganic powder improves the photodegradation performance of plastics
Table 1 shows the relationship between the photoperiod-type environmentally friendly PE film reaching the cracking period (carbonyl index CI=6) and the brittle fracture period (carbonyl index CI=45).
From Table 1, 30% calcium carbonate and environment-friendly light PE film containing 30% talc and calcium and environment-friendly light reaches PE film embrittlement and cracking of containing, respectively, than the time period of the photodegradation PE film ahead of schedule. It is indicated that calcium carbonate and talc powder improve the photodegradation performance of PE, and calcium carbonate has obvious effect on talc powder. To achieve the same degree of photodegradation, adding inorganic powder can reduce the amount of photosensitizer.
4 plastic with soil inorganic powder promote assimilation
At present, the amount of rubbish in municipal waste accounts for about 8%, and the plastic is light. Water and carbon dioxide have little effect on synthetic resin. Filling not only occupies a large amount of land but also affects the stabilization of garbage, and increases the amount of landfill leachate produced; Water and carbon dioxide have an erosive effect on inorganic powders in inorganic powder modified plastic products, such as: CaCO 3 +CO 2 +H 2 O-Ca(HCO 3 ) 2 , if the inorganic powder is biologically active It accelerates the erosion rate of water and bacteria on inorganic powders. Ca(HCO 3 ) 2 has a certain water solubility. Under acidic conditions, the erosion effect is more obvious. After the inorganic powder leaves the plastic product, it leaves micropores and increases the contact area of ​​the plastic product with oxygen, which is beneficial to the aging of the product. Disintegration.
5 favor inorganic powder plastic incineration
It has been found through experiments that the time required for complete combustion of a 100 g photo-calorie-friendly PE film is 1/3 of that of the same quality PE film. This is because when the PE film is thermally expanded, the presence of calcium carbonate forms numerous fine pores, which is equivalent to increase. Large combustion surface area, where environmentally acceptable additives can reduce the burning temperature of plastics. Explain that the presence of inorganic powders and environmentally acceptable additives can make the PE membrane burn more thoroughly and fully.
Whether the waste plastic can be burned and burned in time is one of the key technologies of waste incineration. When the waste is incinerated, the inorganic powder modified plastic in plastic is beneficial to the full combustion of the plastic bag and can effectively absorb HCI and H 2 . Acid gases such as S protect incinerators and reduce the amount of various toxic and hazardous substances including dioxins.
The environmental coordination of starch-modified plastics is good, but recycling and utilization will greatly reduce its use value. The recycling and re-processing will not affect the performance of the inorganic powder itself, but will increase the dispersion of the inorganic powder in the plastic polymer, and the recovery value is high.
7 Most inorganic powders used in plastics are non-toxic
The mined mines are subject to strict screening. The inorganic powders are derived from nature and are non-toxic to the human body. Of course, in the process of production and labor, dust should be collected, and workers should not be allowed to absorb dust for a long time.
The blending of inorganic powder and plastic has made the inorganic powder uniformly dispersed in the continuous phase of plastic polymer in the form of dispersed phase. It is stable and difficult to precipitate in general medium. Calcium carbonate will become calcium ion in long-term acidic medium. Carbon dioxide and water. A little calcium carbonate or calcium acetate should not have too much impact on the human body even if it enters the human body, because people often drink milk, eat bone, and even calcium tablets are calcium compounds.
Through the research on the formulation system and environmental coordination of inorganic powder modified plastic environmentally friendly materials, the feasibility of improving the comprehensive performance of plastic materials and protecting the environment, including incineration, landfill or recycling, is explored. With superiority. Explain that the use of inorganic powders instead of polymer materials is not an expedient measure, not just to reduce costs, it is a cause of shading and children, benefiting society, saving resources, and protecting the environment. Although there are still many problems that need to be taken seriously and solved, although there are various challenges and responsibilities, it is the only way to achieve the coordinated development of plastic materials and the environment.
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