Nylon TR90 molding processing requirements indicate that drying to moisture content less than 0.1% is very important, otherwise the molded product will be white (gas white mist), yellow, foam, silver, brittle, ugly appearance, and poor mechanical properties. , And the loss of raw materials is large; for drying, use a dehumidifying dryer (after drying the humid air, send it to a dryer) with dry air to take away the moisture in the raw materials, so that the appearance of the molded product is qualified; if there is no dehumidifying dryer, Please choose to produce when the weather is clear and the air humidity is less than 50%; if the plastic part is still white after drying, please increase the injection temperature of the barrel to plasticize the raw material; judge that the color transparency of the plastic part is the same as that of the raw material, indicating your injection molding The process is correct.
They combined petroleum light wax fermentation (biological) with nylon monomer synthesis and polymerization (chemical), thus changing the history of nylon production since the invention of nylon 66 in the United States in the 1930s. The entire process from raw materials to nylon products was adopted. The old calendar of chemical synthesis routes. After learning that Zheng Da Nylon's team has rich experience in nylon research, Academician Fang was very pleased that the cooperation between the two parties began. The Institute of Microbiology is responsible for the fermentation of petroleum light wax, focusing on increasing the acid production rate and reducing the cost of dibasic acid. Zhengzhou University in China is responsible for the nylon synthesis process, and a new major research project has begun.
It is very important that the TR90 production process is dried to a moisture content of less than 0.1%, otherwise the injection molded products will be white (gas white fog), yellow, foamy silver, brittle, unsightly appearance, poor mechanical properties, and raw materials The loss is large. For drying, use a dehumidifying dryer (after drying the moist air, then sending it to the dryer). Use dry air to take away the moisture in the raw materials, so that the appearance of the molded product is qualified; if there is no dehumidifying dryer, please choose the weather and humidity Only produce when less than 50%. If the plastic part is still white after drying, it is necessary to increase the injection temperature of the barrel to plasticize the raw material.
Aromatic nylon can be extruded, molded, laminated and impregnated, and can be used to manufacture fiber film impregnated film, decorative laminate, glass fiber laminate, firewall, etc. In addition, PAPA66 also lacks in dimensional stability. Because the flexural modulus is not high enough, the shrinkage rate during injection molding is too large, which makes it impossible to produce. However, semi-aromatic nylon has a low water absorption rate due to the benzene ring contained in the molecular chain, which has changed the impression of "nylon = water absorption" in the eyes of people in the past.
It is very important that the TR90 production process is dried to a moisture content of less than 0.1%, otherwise the injection molded products will be white (gas white fog), yellow, foamy silver, brittle, unsightly appearance, poor mechanical properties, and raw materials The loss is large. For drying, use a dehumidifying dryer (after drying the moist air, then sending it to the dryer). Use dry air to take away the moisture in the raw materials, so that the appearance of the molded product is qualified; if there is no dehumidifying dryer, please choose the weather and humidity Only produce when less than 50%. If the plastic part is still white after drying, it is necessary to increase the injection temperature of the barrel to plasticize the raw material.
Nylon with high strength and rigidity is increasingly in demand in the market. New materials such as inorganic crystals and carbon brazing PA have become important varieties, mainly used for automobile engine parts, mechanical parts and aviation equipment parts; nylon alloying will become The mainstream of the development of modified engineering plastics. Nylon alloying is an important way to achieve high nylon performance. It is also the main method to make nylon materials and increase the performance of nylon. By blending other polymers, it can improve the water absorption of nylon, increase the dimensional stability of products, and low temperature brittleness. Heat resistance and abrasion resistance. Therefore, it is suitable for different requirements of vehicle types.
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