With the continuous development of science and technology, environmental pollution has become more and more serious, and the international community is calling for the protection of the environment. For food grade, what happens if we usually use disposable plastic milk cups that we usually use everyday?
We must first understand the material of the disposable plastic milk cup we usually use? The materials used in the milk cups produced by the factory are PP materials, PET materials, and PS materials. For future scientific and technological development, if these materials can be degraded, it is a great benefit for environmental protection.
First of all, we must first understand what is degradable plastic. The degradable plastic refers to the addition of a certain amount of additives (such as starch, modified starch or other cellulose, photoretically degradant, etc.) during the production process. It is easier to degrade plastic in the natural environment.
Frist, Light degradation plastic
Mix the photoretinizer in plastic and gradually decompose the plastic under the sunshine. It belongs to the earlier generation of degradation plastic. The disadvantage is that the degradation time is difficult to predict due to sunshine and climate change, so it cannot control the degradation time.
Second, biodegradable plastic
Under the action of microorganisms, it can be completely decomposed into plastic with low molecular compounds. It is characterized by convenient storage and transportation. As long as it is kept dry, does not need to avoid light, the application range is wide, which can not only be used for agricultural land membranes and packaging bags, but also widely used in the field of pharmaceuticals. With the development of modern biotechnology, biodegradable plastic has been paid more and more, and has become a new generation of hotspots for research and development.
Third, light/biodegradable plastic
A class of plastic combined with light degradation and microorganisms, which has the characteristics of light and microbial degradation plastic.
Fourth, water degradation plastic
Add water absorption substances to plastic. After use, it can be dissolved in water after use. It is mainly used for pharmaceutical and hygienic utensils (such as medical gloves), which is convenient for destroying and disinfection.
Five, starchy -based plastic
So far, starch -based degradation plastic mainly includes four categories: filling type, light/biodegradation, common mixing, and full starch plastic.
1. Fill in starch plastic
Filling starch plastic is also known as biological destructive plastic. Its manufacturing process is to add a certain amount of starch and other small additives to the general plastic, and then process it. The starch content does not exceed 30%. Filling type of starch plastic technology is mature, the production process is simple, and it can be produced by slightly improved the existing processing equipment. Therefore, most of the currently degradable starch plastic products are like this.
Natural starch molecules contain a large amount of hydroxyl groups to form extremely strong hydrogen bonds in their molecules and between molecules. The polarity of the molecularity is large, and the polarity of synthetic resin is small, which is hydrophobic substance. Therefore, natural starch must be treated on the surface to improve hydrophobicity and compatibility with polymers. Mainly two methods: physical modification and chemical modification.
2. Light/biological dual degradation type
Biodegradable plastic is difficult to degrade in some special areas such as drought or lack of soil, and the light degradation plastic cannot be degraded when it is buried in the soil. Optical/biodegradable plastic is made of photochemical agent, starch, synthetic resin and a small amount of additives (solvent, plasticizer, crosslinking agent, coupling agent, etc.). Among them, the optical agent is an organic compound or salt of the transition metal. Its degradation mechanism is that the starch is degraded by the biological, which makes the maternal body of the high polymer of the degradable plastic raw materials become loose and increases the surface area. At the same time, the sunlight, thermal, and oxygen causes the optical agent, resulting in a high polymer broken chain and a decrease in molecular weight.
3. Common mix
Starch co -mixed plastic is a starch plastic mixed with starch and synthetic resin or other natural polymer. The main component is starch (30%~ 60%). Ethylene/Evoh (EVOH) sync, polyvinyl (PVA), cellulose, lignin, etc., are characterized by high starch content, and some products can completely degrade.
4. All starch type
Differential starch molecular degeneration and discerning, forming armoplastic starch resin, and then adding a small amount of plasticizer and other additives, which is the so -called all -starch plastic. Among them, the starch content is above 90%, and the small amount of other substances added is non -toxic and can be completely degraded. Therefore, the whole starch is truly completely degraded. Almost all plastic processing methods can be applied to all starch plastic, but traditional plastic processing requirements are almost no water, and the processing of whole starch plastic requires a certain amount of water %Is suitable, and the temperature cannot be too high to avoid burning.
Six, oxidation degradation
Add additives to the traditional plastic production raw materials, which is the same as adding methods to the general color mother. After plastic products are abandoned, the two substances in additives work: first, pre -oxidant (mainly some non -toxic metal ions), and the other is biodegradation promoted substances (mainly some natural plant cellulose). Premium oxidant controls plastic to maintain its due life and function when not abandoned. After abandonment, the molecular weight is reduced through the peroxidation reaction, making the polymer crispy and easy to decompose microorganisms. Biodegradation promotes substances mainly to promote the breeding of microorganisms. Compared with amyloid -based plastic technology, this technology is simple and easy to run, and the cost is reduced. General equipment can be produced. According to relevant verification, the performance of plastic has to be well maintained. Save food.
IMLcustomcup specializes in the production of various paper cups (single wall, double wall, ripple), plastic cups (IML, PP, PET, PLA), and plastic-free paper cups (completely degradable).
