Not necessarily. Now the country advocates the use of degradable plastic products, white garbage, yes, plastic garbage pollution.

What degradable materials are there?

According to the external factors of degradation, it can be divided into:

1. Photodegradable material: degraded by sunlight;

2. Biodegradable materials: degraded by respiration or chemical synthesis of natural microorganisms such as fungi and bacteria, and finally decomposed into carbon dioxide and water;

3. Environmentally degradable materials: degrade under natural environmental conditions such as light, heat, water, pollutants, microorganisms, insects and mechanical forces.

There are many factors that affect the degradation performance of materials, as follows:

Effect of pH value on degradation of polymer materials

Mader et al. think that the change of pH value has a great influence on the hydrolysis rate of * * * polymer chain, but there is little difference in the degradation rate in different parts of the organism. The degradation of * * * polymer can form an acidic microenvironment, promote the autocatalysis of * * * polymer, and thus lead to its degradation.

Effect of temperature on degradation of polymer materials

In experiments, the relationship between material degradation and temperature is rarely seen, because in vitro experiments are often carried out to simulate body temperature, and human body temperature changes little. However, in the process of in vitro experiments, for the needs of experiments, sometimes the temperature can be appropriately increased to shorten the experimental period. But in the process of accelerated degradation, the temperature should not be too high or too low, because the polymer will have side reactions when the temperature is too high; The temperature is too low to accelerate the degradation. Therefore, in order to avoid the influence of temperature and airflow on degradable materials, degradable materials are kept in a low-temperature sealed environment.

Effect of molecular weight on degradation of polymer materials

Wu et al. think that the molecular weight and its distribution of * * * polymer have a significant influence on the hydrolysis rate of materials. This is mainly because every ester bond may be hydrolyzed, and the hydrolysis of ester bonds in molecular chains is irregular. The longer the polymer molecular chain, the more sites that can be hydrolyzed and the faster the degradation.

Effect of material structure on degradation of polymer materials

Anhydride and orthoester are easily hydrolyzed. Li et al. think that the rapid decline of comb polymer's mass and molecular weight is due to the polarity of the skeleton, which is beneficial to the breaking of ester bonds. Therefore, the degradation rate of comb molecules is faster than that of linear molecules.

Effect of monomer composition ratio on degradation of polymer materials

The degradation behavior of materials is related to the physical and chemical properties of materials, and the polarity, molecular weight and distribution of polymers will affect the degradation performance of materials. Wu et al. think that the degradation of * * * polymer is closely related to the molecular weight and crystallinity of * * * polymer. For example, the crystallinity of glycolide and lactide polymers is lower than that of homopolymers of these two monomers.

Glycolic acid is more hydrophilic than lactic acid, so the hydrophilicity of PGLA** polymer with more glycolide is better than that of PGLA * * polymer with more lactide, so the degradation speed is fast. Hydrophilic polymers have large water absorption capacity, and the molecules inside the materials can fully contact with water molecules, so the degradation speed is fast. On the contrary, the molecules in hydrophobic polymer materials have less contact with water molecules and the degradation rate is slow.

What material is degradable garbage bag?

Generally, it is polyethylene, and the added masterbatch is helpful to the decomposition of polyethylene. Under the catalysis of the external environment, it can be decomposed into organic carbon dioxide and water in two to three months, which has no pollution to the environment. Ordinary degradable polyethylene is partially decomposed, and the added grange masterbatch is completely decomposed.

Some formulations of degradable plastic bags are made of carbonate. This polymer degrades easily. Of course, it is not polycarbonate that is used to make buckets, but esters formed by carbonic acid and other compounds.

Extended data:

According to the classification of biodegradation process, biodegradable plastics can be divided into complete biodegradable plastics and destructive biodegradable plastics. At present, the destructive biodegradable plastics mainly include starch modified polyethylene PE, polypropylene PP, polyvinyl chloride PVC, polystyrene PS and so on.

Fully biodegradable plastics mainly take natural polymers or agricultural and sideline products as raw materials, and through microbial fermentation or synthesis of biodegradable polymers, such as thermoplastic starch plastics, aliphatic polyester, polylactic acid, starch/polyvinyl alcohol, etc.

Baidu encyclopedia-biodegradable plastics

What are the four categories of garbage classification?

The four categories of garbage classification are recyclable garbage, kitchen garbage, harmful waste and other garbage.

1, recyclable garbage

It mainly includes waste paper, plastic, glass, metal, cloth and so on. Waste paper: mainly includes newspapers, periodicals, books, various wrapping papers, office paper, advertising paper, cartons and so on. However, it should be noted that paper towels and toilet paper are too water soluble to be recycled. Plastics: mainly include all kinds of plastic bags, plastic packaging materials, disposable plastic lunch boxes and tableware, toothbrushes, cups, mineral water bottles, etc. Glass: mainly includes all kinds of glass bottles, broken glass pieces, mirrors, light bulbs, thermos bottles and so on. Metal objects: mainly include cans, cans, toothpaste skins, etc. Cloth: mainly includes discarded clothes, tablecloths, towels, schoolbags, shoes, etc. Comprehensive treatment and recycling can reduce pollution and save resources.

2, kitchen waste

Including leftovers, bones, vegetable roots, leaves and other food wastes, can produce 0.3 tons of organic fertilizer per ton by on-site composting with biotechnology.

3. Hazardous waste

Including waste batteries, waste fluorescent tubes, waste water silver thermometers, expired drugs, etc. These wastes need special safety treatment.

4. Other garbage

Including bricks, tiles, ceramics, muck, toilet waste paper and other wastes that are difficult to recycle, sanitary landfill can effectively reduce the pollution of groundwater, surface water, soil and air.