SPM is a new environmental protection material and has a number of invention patents.Taking natural renewable plant starch as raw material, a new kind of biological base material was formed by processing plasticization to replace petroleum based plastics.The biodegradable and pollution-free consumer goods can be produced by this raw material.

PLA is a new kind of biodegradable and biodegradable material, which is made from starch from renewable plant resources (such as corn, cassava, etc.).Starch raw material is glycosylated to obtain glucose, which is then fermented into lactic acid with high purity by glucose and certain bacteria species, and then polylactic acid with certain molecular weight is synthesized by chemical synthesis method.It has good biodegradability. After being used, it can be completely degraded by microorganisms in nature under specific conditions and eventually generate carbon dioxide and water without polluting the environment. This is very beneficial to environmental protection and is recognized as an environmentally friendly material.

Characteristics of PLA:

1. Good mechanical properties

PLA has good mechanical and physical properties, moisture resistance, grease resistance and good tightness.With good tensile strength and ductility, it can also be used in various of common processing methods.

2. Completely degradable

Most importantly, PLA has good biodegradability. PLA can be completely degraded by microorganisms in nature under specific conditions and eventually generate carbon dioxide and water without polluting the environment, which is very beneficial to environmental protection and is recognized as an environment-friendly material.

3. Good gloss and transparency;The use of polystyrene film is comparable to that of other biodegradable products that cannot be provided.

4. PLA film is the only biodegradable plastic with excellent antibacterial and antifungal properties.

5. PLA performance is stable at room temperature, the temperature is higher than 55 ℃ or oxygen enrichment and automatically under the effect of microorganism decomposition, the resulting carbon dioxide and water. Do not pollute the environment.

6.PLA also has the disadvantages of poor impact resistance and easy hydrolysis.

Synthesis method of PLA

PLA can be synthesized in three ways: direct condensation polymerization, open-loop polymerization and solid polymerization.

1. Direct condensation

The main characteristics are that the synthetic polylactic acid can contain no catalyst, the polymerization process is short, easy to decompose and small molecular weight, but the reaction conditions are relatively harsh, the requirements for the polymerization monomer and the requirements for ordinary polylactide monomer, the resulting polylactic acid product performance is poor, small practical value.

2. Open loop polymerization

Because it is an open-loop polymerization of ring dimer, unlike ordinary condensation polymerization, there is no small molecule water generation, and the polymerization equipment is simple.The polylactic acid obtained by this method has high molecular weight and high mechanical strength.

3. Solid assembly method

In this method, the low-molecular weight resin obtained by direct polymerization is polymerized under the conditions of vacuum reduction and temperature tg-tm to improve the degree of polymerization and molecular weight, so as to improve the strength and processing properties of the material.

Application prospect of PLA

PLA is a fully biodegradable material, It has been paid more and more attention by people and has a great market application prospect in the future.Imagine, there is no longer a mountain of white garbage on the earth, plastic has been put to the ground, what is better than this?