来源网址：http://www.rsoau.com 2019-04-02 14:43:02
Don't look at disposable chopsticks that are relatively white and feel quite clean. In fact, too white is not good. So don't use self-confidence to choose, and know more about this knowledge. Only in this way can we bring more benefits and convenience, so we can guarantee our health problems. Disposable plastic lunch box is an indispensable material in today's life. It is needed in many occasions. It is a successful example of recycling and reusing the most useful resources in life. Our country has always advocated the reuse of resources, such as not only to save resources but also to achieve the goal of environmental protection. Therefore, disposable plastic lunch boxes are always recognized by public friends and become a favorable resource for social environmental protection. They are well used in daily life, helping more friends to deal with the problems in life.
The advantages and disadvantages of disposable paper cups can be distinguished by the pattern of "one look, two smells and three touches".
Look: In addition to looking at the name, address and date of production of the manufacturer on the packaging, we should also look at the light, if there is blue light or impurities do not buy;
Smell: Has a pungent smell?
Touch: It feels very soft, maybe it's inferior.
Tip: When using disposable paper cups, first blanch them with boiling water to make the harmful substances in the cups volatilize. The first one: How about using disposable lunch boxes? The next one is how to distinguish the texture of convenient chopsticks.
When choosing a milk cup, the thickness of the material should be initially considered. It is too soft to hold the milk cup with your hand. It can not be held out without effort. Take a glass of water to feel at home first, then hold it in your hand when you buy it to see if the thickness is enough. Others are the strength of the rim of the milk tea cup. The rim of the milk tea cup should be thick and strong enough, mainly with a well-proportioned material. When the milk tea is so full, the rim of the hand cup will not be spilled. Too thin cups and too soft rims can greatly destroy the mood of customers, and when you doubt the quality of milk tea cups, you must also doubt the quality of milk tea. When customizing disposable milk tea cups according to specifications, what explanations should be paid attention to?
Resources and environment are the growing problems that mankind can continuously promote in the 21st century. Biotechnology will become one of the main technologies to solve this problem. Among the many components that cause environmental pollution, the pollution caused by plastic waste has attracted wide attention of the society. The main degradable plastics producing countries in the world today are the United States, Japan, Germany, Italy, Israel and Canada. The varieties include photodegradation, photobiodegradation, disintegrating biodegradation, thorough biodegradation and so on. Biodegradable plastics refer to plastics that can be decomposed by microorganisms in soil. With the help of bacteria or their hydrolytic enzymes, materials can be decomposed into carbon dioxide, water, honeycomb-like porous materials and salts. They can be completely decomposed after further microbial influence and re-enter the biosphere. It is a hot research and development topic in various countries.
The degradation nature of biodegradable materials and the testing of the degradation nature of biodegradable materials have not yet formulated a unified standard. The methods adopted or prepared for adoption by ASTM can be selected as the standard methods. The primary methods for estimating the degradation nature of biodegradable materials through biological and microbiological experiments are as follows. There are two kinds of burial methods: outdoor burial method and indoor burial method. The degradation nature of micro-biodegradation and its conjecture have not yet established a unified standard for testing the degradation nature of biodegradable materials. The method containing the method adopted or prepared for adoption by ASTM can be adopted as the standard method.
And when we create a small amount of plastic products (such as building materials), we don't want it to degrade, but we want it to last as long as possible. This demand also determines the necessity of the existence of non-degradable materials. PHA has many advantages, but there are a few unsatisfactory aspects in this material. For example, the molecular chain structure makes it easier to crystallize, which reflects that the material made by PHA is very "brittle" and can not withstand long-term use and strong impact. Its hydrophilicity is not good, which will limit its application in the field of biology. In addition, in PHA, the melting point of PHB is very close to the decomposition temperature, that is to say, if the processing temperature is slightly higher, it will decompose, while the low temperature will make it difficult to form.