Plastics are indispensable materials in today's society and industry. It has the advantages of strong corrosion resistance, acid and alkali resistance, low manufacturing cost, good durability, waterproof, light weight, easy molding, etc. Plastic products can meet the needs of all aspects of daily life. It is widely used in agriculture, industry, construction, packaging and other fields, national defense industry, people's life and other fields.
Xi'an plastic bucket manufacturer Tell you about some common daily necessities, such as plastic water pipes, plastic cups, plastic pots, etc., but we all have such experience. In winter, some plastic products become hard. Why? Plastics are high molecular compounds formed by monomer addition polymerization or polycondensation. The combination between molecules is very tight and not easy to move. For example, polyethylene (PE) is a plastic compound. It is a high molecular weight organic compound polymerized from ethylene. It is divided into low molecular weight and high molecular weight.
Low molecular weight is generally liquid, colorless and odorless, insoluble in water, with a density of 0.92g/cm3, which can be used as lubricating oil and coating; The high molecular weight is generally solid, milky white, thermoplastic, hand wax, and the density is 0.92~0.96g/cm3. It has corrosion resistance and good insulation performance. HDPE has the characteristics of high hardness, high hardness and high mechanical strength. It can be used as container, pipeline and high-frequency electrical insulation material for radar and television.
Plastic water storage tank Insoluble in water, low water absorption. When the temperature exceeds 70 ℃, it only slightly dissolves some chemical solvents, such as toluene and acetic acid. However, when the temperature varies between 15 ℃ and 40 ℃, the granular polyethylene can be melted or solidified. When the temperature rises, it melts and absorbs heat; When the temperature drops, it solidifies and releases heat. The reason why the plastic products used now are relatively soft is that plasticizers are added in the manufacturing process.
Xi'an plastic bucket The manufacturer tells you that these plasticizers, such as lubricants, can reduce the attraction between polymer molecules, move molecules between molecules, and make plastics soft. Some plasticizers have poor cold resistance, and their smoothing effect becomes weaker in winter at low temperature. The molecules in the plastic are tightly combined again and cannot rotate sensitively, causing the plastic to harden. When the temperature rises, the plasticizer recovers and smoothes, and the plastic will remain as soft as before.
Plasticizer has certain volatility. When plastic products are used for a long time, the plasticizer will gradually volatilize, the smoothing effect will be reduced, and the plastic will harden. With the deepening and development of scientific research, the demand for use is also expanding. Cold resistant, low temperature resistant and weak volatility plasticizers are also gradually emerging. Plastic products containing these plasticizers can remain soft in winter
