Bio-degradation material-PLA

August 9, 2021
Latest company news about Bio-degradation material-PLA

With the rise of environtmental protective awareness and ban of plastic pollution,more and more people focused on green material usage and how to use recyle material.

Today we are going to talk about one of the green biodegradable material - PLA 


latest company news about Bio-degradation material-PLA  0

English:polylactide, polylactic acid,short call PLA

Nickname in English:polytrimethylene carbonate;1,3-Dioxan-2-one homopolymer

Molecular formula:(C3H4O2)n

The characteristics of non-toxic, pollution-free and pollution-free of PLA materials in environmental protection have attracted extensive attention in relevant industries. Under the era background of green and low-carbon , let's see the environmental and economic benefits of PLA as an environmental protection material in the window display industry, and interprets the importance of environmental benefits in modern economy and society.

Environmental benefits of PLA environmental protection materials

PLA is the abbreviation of biodegradable plastic polylactic acid, and its full name is polylactide. polylactide, is a new transport material and had been widely used. One of the main reasons why PLA material is widely used is that it has high environmental benefits. Compared with other materials, PLA has less impact on the surrounding environment in terms of raw material acquisition, production, use and waste treatment. This article will start from the procurement, manufacturing, use of raw materials and waste treatment to prove the great advantages of PLA in environmental benefits.

The main raw materials of PLA are renewable resources such as corn. The acquisition of such resources will not affect the natural environment. At the same time, such plants are not scarce resources. The mankind can obtain a large number of them and repair the environment. However, the acquisition of other raw materials will impact on the natural environment. For example, FRP is also one of the important and main materials used for mannequins. FRP products are good corrosion-resistant materials. FRP is made from mixed , resin ,phenolic plastic, epoxy resin and polyester resin. . its strength is comparable to the steel - so it is called FRP. However, FRP products can not degrade after scrapping and cannot decompose naturally; Waste products cannot be comprehensively utilized and pollute the environment. Its waste products cannot be burned, and the smoke is harmful; FRP landfill is also very difficult to degrade. In contrast, PLA are easy to obtain and will not cause harm to the natural environment. Therefore, PLA materials have great environmental benefits in terms of raw materials. In the acquisition process, PLA materials also have environmental benefits. PLA is a polymer material formed by extracting starch from raw materials, saccharifying it to glucose, and then fermentation. The manufacturing process is relatively simple and does not require heating. In contrast, the manufacture of some plastics requires the heating the chemical products to produce harmful gases. For example, in acquisition of polyethylene products, it needs to be heated to 150 ℃ with low pressure ethylene. In this process, many harmful gases, such as formaldehyde and carbon monoxide will be decomposed. During the manufacture of FRP mannequins and painting, a considerable number of harmful solvents volatilize and fly into the environment .Various waste gases from FRP production are directly discharged into the atmosphere, which not only wastes resources, but also pollutes the atmospheric environment. In the acquisition process of FRP, styrene is used as diluent and crosslinking agent, and a large amount of volatilization will occur during curing and storage, which is why the FRP industry is a heavily polluting industral. In contrast, the chemicals produced during the production of PLA will not affect the natural environment. Therefore, the environmental benefit of PLA material in the manufacturing process is greater than that of other packaging materials.

PLA also has advantages in use. Packaging materials need to touch a variety of items. As a new environmental protection material, the most remarkable feature of PLA is non-toxic. Traditional materials will produce some toxins in the process of use. For example, plasticizers for PVC plastics are toxic. The stabilizer used in some plastic products is lead stearate, which is also toxic. It will cause lead poisoning after entering the human body. PLA will not cause harm to the wrapped goods, nor will it cause harm to the human body, because PLA takes lactic acid as the main material, which itself is non-toxic, and there are basically no harmful substances added in the production process, coupled with its own stability. Therefore, the use of PLA also has great environmental benefits.

The end is the disposal of waste after use, it is the most concerned point. Traditional plastics are widely used by people because of their unique advantages, but after use, they are discarded or collected for centralized treatment. However, these two solutions have their disadvantages: the plastics discarded by people can not decompose by themselves, resulting in "white pollution", and some animals may eat these plastic products and die. The centralized treatment of plastics is not an effective method. First, it is difficult to rot when plastic is buried underground. Second, the burning of plastics will produce harmful gases, such as formaldehyde after the burning of polystyrene, causing vomiting and other symptoms. PLA is different. It can be collected and transported to the composting plant for composting treatment, and can achieve the effect of complete decomposition in a short time. If it is discarded , under the action of microorganisms, PLA materials will be decomposed into carbon dioxide and water in a short time, and finally absorbed by soil organic matter or plants, and will not be discharged into the air, so it will not cause greenhouse effect. Therefore, PLA also has great environmental benefits in waste treatment.

By analyzing the economic benefits of PLA green logistics materials, we can also know the comprehensive economic benefits that can be obtained by the application of PLA in the mannequin industry in the mannequin manufacturing process.

Model Building

    1.Economic benefits of logistics materials

Economic benefits are social labor savings achieved through the external exchange of goods and labor, that is to achieve as many business results with little labor consumption as possible, or to achieve more business results with the same labor consumption. Economic benefit is the comparison between capital occupation, cost expenditure and useful production results. The so-called good economic benefit means less capital occupation, less cost expenditure and more useful achievements; Improving economic benefits is of great significance to society. Based on the overall idea of supply chain, the resource consumption, capital saving and occupation of the whole chain are calculated quantitatively from the production cost, transportation cost, storage cost and end disposal cost of logistics packaging. This aticle analyzes the most widely used plastic logistics packaging bag of logistics packaging materials, and compares the economic benefits of ordinary plastic logistics materials and PLA environmental protection logistics materials.

 2.Calculation of economic benefits of logistics materials

Economic benefits of logistics materials = contribution (output, income) / input (consumption, proportion) × 100% = profit per unit of logistics transaction / (cost per unit of logistics packaging and materials + storage cost per unit + transportation cost per unit + end disposal cost per unit)

    3.Cost of ordinary plastics and PLA green logistics materials:

Plastic bag material cost calculation formula: long × wide × Number of layers × thickness × proportion × Price one material cost: double layer PP material with length of 40cm, width of 30cm and, 17000 yuan per ton. The material cost of each bag shows that the cost of PP material express packaging bag is 0.1275 yuan. For the same PLA material, 24000 yuan per ton, with a specific gravity of 1.3, the cost of PLA material express packaging bag is 0.2995 yuan.

 Processing cost of ordinary plastic packaging

1.For ordinary plastic logistics packaging, the treatment method is disorderly stacking, cleaning and transportation, incineration or landfill. One kilogram of PP material produces 70 kilograms of waste water and 0.12 kwh of electric energy to produce alkane and olefin gases, which are characterized by non methane total hydrocarbons.

The average total cost of waste incineration in China is 250 yuan / ton, the cost of industrial power is about 1.8 yuan / kWh, and the COD in industrial wastewater is 200mg / m3. Taking PP material as an example, its end treatment cost per unit = incineration cost + industrial power cost + virtual cost of pollutants in wastewater + cleaning and transportation cost + incineration cost. Then the end treatment cost per unit = 250 + 1.8 × 120+0.2 × ten point eight × 70 + 25 + 60 = 702.2 yuan / ton

2.PLA environmental protection logistics packaging processing cost

PLA has stable performance at room temperature, but it will degrade rapidly and automatically above 55 ℃ or under the action of oxygen enrichment and microorganisms, and finally produce CO2 and water; Then, under photosynthesis, they become the starting materials of starch, which is a completely natural recycling green material. Therefore, the main treatment method of PLA materials is disorderly stacking, cleaning and transportation, and simple landfill. Then the waste treatment cost per unit of PLA packaging material is: 25 + 8 = 33 yuan. The pollutant treatment cost is 0 yuan.

Conclusion analysis

Assuming that the unit logistics transaction profit is a yuan, the economic benefit of ordinary plastic packaging = logistics transaction profit per unit / (logistics packaging and material cost per unit + storage cost per unit + transportation cost per unit + end disposal cost per unit), a / 17702.2 is obtained. Then the environmental benefit of PLA environmental protection material logistics packaging = per unit logistics transaction profit / (per unit logistics packaging and material cost + per unit storage cost + per unit transportation cost + per unit end disposal cost) is a / 24033. The economic benefit of PLA environmental protection logistics packaging material is slightly lower than that of ordinary plastic logistics packaging. Although the economic benefit of PLA new environmental protection logistics material is slightly lower than that of ordinary plastics, in the long run, its environmental benefit will greatly benefit the whole logistics industry and even the society, and improve the severe situation of white pollution in the logistics industry.

Let's look forward to the green benefits of PLA in the application of mannequins and display props industry.