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The PLA and PET: plastic world two focal points of comparison

Author : Lynn

Update time : 2024-11-20 18:00:23

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Plastic as an important material in modern society, on the one hand, greatly promote the development of the industry and daily life; Long, on the other hand, the problems of pollution has also sparked a global environmental crisis. Under this background, the environmental protection plastic gradually into people's horizons, the PLA (Polylactic acid) and PET (polyethylene terephthalate) is a major concern. As representatives of both emerging and traditional materials, they have their own advantages in terms of performance, application and environmental impact.This article will compare from multiple dimensions of PLA and PET, help you fully understand the advantages and disadvantages of these two kinds of material, choose the suitable application scenario.

I. What is the PLA and PET?
Polylactic acid (PLA) is a bio-based material made from renewable plant resources such as corn and sugar cane.It is after the starch in plants into lactic acid polymerization, has good biodegradable properties. Under the condition of certain industrial composting, polylactic acid can be in 6 to 12 months is decomposed into water and carbon dioxide. However, the physical properties of the PLA are relatively limited, such as poor heat resistance, mechanical strength is insufficient, which makes it is mainly used for low intensity, short term use products, such as disposable tableware, straws and packing materials.

PET is the representative of the traditional plastic chemicals derived from oil (terephthalic acid and glycol) synthesis. To its high strength, transparency, and is famous for its durability, widely used in the beverage bottle, food packaging and textiles. Although PET can't natural degradation, it can be used repeatedly by recycling system, has become an important material of circular economy. The degradation time of PET in the natural environment, however, could last for hundreds of years, this poses a challenge to the ecosystem.

II. PLA compared with PET performance and environmental

1. Environmental performance
PLA's biggest bright spot is that it is renewable and biodegradability. Compared with petroleum-based plastics, the PLA's more environmentally friendly raw material sources, after use if under the condition of proper composting process, can be broken down into harmless substances.However, it is important to note that family composting conditions often cannot achieve its degradation process, so many products eventually poly (lactic acid) (PLA) landfills.
Although PET is non-biodegradable, but it makes the recycling potential of its sustainability has certain advantages. In many countries, PET has become one of the most popular plastic recycling. However, this process depends on a sound recovery infrastructure and active participation of consumers.If the PET mishandled, may cause long-term impact on the environment.

2. Mechanical properties
In terms of mechanical properties, PET has a significant advantage.High strength, high transparency and good heat resistance to deal with all kinds of harsh usage scenarios, such as high pressure carbonated beverage bottle and microwave safe container. In contrast, the PLA's low melting point and low strength limits its application scope, especially in need of high temperature resistant or bearing in the scene.

3. The economic efficiencyFrom a cost point of view, the PLA's production cost is relatively high, the main customers by policy support and promote environmental awareness. PET has a large number of production, its economic advantage is obvious. This is also one of the reasons for PET is still dominant. However, with the progress of technology and the expansion of the scale of production, the cost of the PLA is gradually reduced, is expected to further enhance its competitiveness.

III. Application Scenario Analysis

1. The food and beverage packaging
PLA because of its characteristics of safe environmental protection, more and more used in disposable food packaging and straws, especially in the implementation of the plastic ban area.However, for long-term storage or high-pressure beverage packaging, PET high strength and durability is still the preferred material.For example, most of the bottles on the market still using PET, the PLA is mainly used for short term cold cups and fresh food packaging.

2. Medical and industrial fields
PLA biodegradable property in the medical field, especially in the surgical suture line of biodegradable and implants.In addition, the PLA also because of its easy to print and become popular in the field of 3 d printing materials.On the other hand, PET industrial fiber, fabric and durable packing areas such as well, shows its versatility and high performance.

3. The trend of sustainable development
In recent years, with the strengthening of environmental protection policy, the PLA's share of the market gradually expanded, especially in the field of disposable products and packaging.At the same time, the PET recycling technology has been perfect, such as depolymerization and polymerization technology, will further extend the life cycle, reduce the impact on the environment.

IV. The future of the PLA and PET

1. The technical innovation to promote developmentThe progress of science and technology for the future development of these two kinds of material.For example, through the modification and synthesis, the PLA's mechanical properties and heat resistance is expected to be improved, so as to expand its application field.Chemical recycling technology in development, PET waste plastics can be broken down into the original molecules, reused to make new products, realize the closed loop economy.

2. The policy and the dual role of the marketPolicy in promoting the development of environmental protection material plays a key role.Many countries have issued to encourage use of PLA and other biological base material incentives, as well as for PET recycling higher requirements are put forward.Consumers' environmental awareness is also affecting the market of choice, more and more people are willing to pay for the environmental protection product.

3. The possibility of collaborative development
Each have advantages and disadvantages of PLA and PET.The two are not mutually exclusive, but in the coordinated development of different application scenarios.PLA is suitable for short term usage scenarios, and PET has advantages in terms of durability and recyclability.Both common development will help ease the global plastic pollution problem.

V. Conclusion: how to choose the suitable plastic material?

For businesses and consumers, the choice of material performance, cost and environmental impact should be considered.In the pursuit of environmental protection at the same time, we must also consider the actual needs.PLA is environmental protection tide pioneer, suitable drive and consumption upgrade in policy under the background of promotion;The PET with its mature industry chain and recycling technology, will still has an important role in the plastic market.In the future, through technical innovation and policy guidance, the PLA and PET will contribute to sustainable development.
The future not only depends on the progress of the material of environmental protection, need to be more active participation of consumers.From choose environmental protection material to participate in the recycling system, the efforts of everyone will contribute to the sustainable development of the earth.

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