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[Chemical Knowledge]：Manufacturing method and process flow of polyester industrial yarn

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Manufacturing method
of polyester industrial yarn
polyester industrial yarn is a synthetic fiber material widely used in chemical industry, textile, construction and other fields, with high strength, wear resistance, chemical corrosion resistance and other advantages. This article will introduce the manufacturing method of polyester industrial yarn, including raw material preparation, polymerization reaction, spinning, drawing and post-processing.

1. raw material preparation

manufacturing polyester industrial yarn is the main raw material of purified terephthalic acid (PTA) and ethylene glycol (EG). These two raw materials need to go through a certain treatment before they can be used in the subsequent polymerization reaction.

1. Treatment of PTA
PTA needs to react with acetic acid to generate acetate under high temperature and high pressure, so as to facilitate the subsequent polymerization reaction. It is necessary to control the reaction temperature and pressure in the production process of acetate to ensure the quality and yield of the product.

2. Treatment of EG
EG needs to be dehydrated to remove water and impurities and ensure the normal progress of polymerization. The dehydration treatment is generally carried out using an adsorbent such as molecular sieve or alumina.

2. polymerization reaction

After the raw materials are prepared, the acetate and EG are mixed according to a certain ratio, and the catalyst and stabilizer are added to carry out the polymerization reaction. The polymerization reaction generally adopts a continuous polymerization method, and it is necessary to control the reaction temperature, pressure, stirring speed and other parameters to ensure the molecular weight and molecular weight distribution of the product. Dacron polymers obtained

3. spinning

polymerization need to be processed into fibers by spinning. Spinning is generally used melt spinning method, the polymer is heated and melted, the filaments are sprayed through the spinneret, and the fibers are formed by cooling and solidification. In the spinning process, it is necessary to control the aperture of the spinneret, spinning speed, cooling temperature and other parameters to ensure the quality and output of the fiber. The fibers spun

the 4. stretching

need to be stretched to improve their strength and elasticity. Stretching generally adopts multi-stage stretching method, and by gradually increasing the stretching ratio, the fiber structure becomes more compact and the mechanical properties of the fiber are improved.

5. post-treatment

the fiber after drawing treatment also needs to be post-treated, including heat setting, oiling, winding and other processes, in order to obtain the final polyester industrial silk products. Heat setting is to stabilize the fiber structure and improve its dimensional stability; oiling is to increase the lubricity of the fiber and facilitate subsequent processing and use; winding is to roll the fiber into a certain shape of the reel, which is convenient for storage and transportation.

In short, the manufacture of polyester industrial yarn requires multiple processes, including raw material preparation, polymerization, spinning, drawing and post-processing. Each process requires strict control of process parameters to ensure product quality and yield. At the same time, it is also necessary to strengthen the environmental management in the production process, reduce the discharge of waste and pollutants, and improve the sustainability of production.

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