Temperature factors have a vital impact on the performance, life and safety of power batteries. Generally speaking, we expect the battery system to operate in the range of 15-35 C, so as to achieve the best power output and input, the maximum available energy, and the longest cycle life (although cryogenic storage can prolong the calendar life of the battery, but the application of cryogenic storage is not significant, which is very similar to human beings). The refrigeration effect of fluorinated refrigerant is excellent, which can effectively reduce temperature and prevent explosion.
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8 new plastic food packaging materials
In recent years, some special novel packaging materials have appeared in food packaging materials. These materials are more intelligent and reflect more value in food packaging. However, for various reasons, it is still difficult to quickly popularize the use of these materials.
Food packaging plastic for special materials
(1) Wood powder plastic
Japanese scientists and technicians have developed a wood powder plastic packaging material from pine wood, which is produced by extracting polyol from wood powder and then reacting with isocyanate to form polyurethane. This wood powder plastic is extremely resistant to heat and can be biodegraded and can be used to make temperature-resistant bags.
(2) Corn plastic
American researchers have developed a corn plastic packaging material that is easy to break down. It is made by incorporating corn starch into polyethylene, which is suitable for making food packaging integrated packaging bags. The package dissolves quickly in water, avoiding contact with the source of contamination and bacterial toxicity.
(3) Rapeseed plastic
A rapeseed plastic packaging material was successfully developed by the United Kingdom. It extracts three genes that can produce plastics from bacteria that make biopolymers and transfers them to rapeseed plants. After a period of time, a plastic polymer liquid is produced, and a rapeseed plastic can be obtained through refining. The packaging material or food fast food packaging material made of such plastic processing can be decomposed by itself after being discarded, and there is no pollution residue.
(4) Wheat plastic
This is a plasticized plastic film which is mixed with wheat flour, glycerin, glycol, silicone oil, etc., and then subjected to pressure hot pressing at 150 kz/Id to form a translucent plastic film. The advantage of packaging food with wheat plastic is that it can be decomposed by microorganisms.
(5) Soy plastic
Soybean-derived proteins in the United States produce plastic-like food packaging materials that can replace plastics that are synthesized from petroleum. The production technique is to soak the soybean, grind and separate the protein, and then dry the protein solution to remove the water, and then mix the protein powder with other ingredients and additives to form an edible film or coating. Used in food packaging. They have good strength, elasticity and moisture resistance.
(6) Chlorophyll plastic
German scientists have invented a plastic film that has been "dyed" by chlorophyll. Most of the green fruit and vegetable foods contain a large amount of chlorophyll, and this pigment undergoes a photo-oxidation reaction under the irradiation of light, which decomposes the energy in the food, thereby causing the food to rot. The plastic film is "dyed" by chlorophyll in a special way. After this treatment, the film can be effectively used to package food, "catch" the light that causes the food to rot, thereby greatly prolonging the shelf life of the food.
(7) Bacterial plastic
British researchers have developed a PHB bacterial plastic. It first grows a bacterium with sugar and processes it to make a material similar to polypropylene. The material is non-toxic and easy to biodegrade. It is an ideal material for processing food packaging bags. It is environmentally friendly after disposal.
(8) Detecting film
This is a special film that can detect bacteria, that is, a special coating on the surface of ordinary food packaging film, so that it has a special function to detect bacteria, such as the detection film for raw and cooked meat packaging, if The packaged meat products are not fresh, and the harmful bacteria content exceeds the food hygiene standards. The packaging of the film will turn the original transparent and colorless packaging film into a warning color, so that consumers know that the meat food is no longer edible.