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[Chemical Knowledge]:BOPA production and manufacturing methods and processes.

BOPA (biaxially oriented nylon) is a high-performance engineering plastic, which is widely used in packaging, electronics, automotive, aerospace and other fields. In the field of chemical production raw materials, the manufacturing method of BOPA mainly includes polymerization, casting, biaxial stretching and other steps. This article will introduce the manufacturing method of BOPA in detail.

1. Polymerization

The production of BOPA begins with the polymerization of nylon 6 or nylon 66. This process is under the condition of high temperature and high pressure, the caprolactam or adipic acid and hexamethylene diamine polymerization reaction, the formation of nylon 6 or nylon 66 polymer.

2. casting

polymerization of nylon polymer polymer, after the extruder melt plasticization, through the die to form a certain thickness of the sheet. This process requires strict control of temperature, pressure and other parameters to ensure uniform sheet quality and thickness.

3. biaxial stretching
After the
cast is completed, it is necessary to perform biaxial stretching treatment to improve the strength and toughness of BOPA. Biaxial stretching includes two steps of longitudinal stretching and transverse stretching.

1. Longitudinal stretching: the sheet is stretched in the longitudinal direction (length direction), usually by stretching in a stretching machine, by gradually increasing the stretching ratio, so that the molecular chains are orderly arranged in the longitudinal direction to improve the strength and toughness of the material.
2. Transverse stretching: After the longitudinal stretching is completed, the sheet is stretched in the transverse direction (width direction), generally under certain conditions of temperature and tension, by inflation or biaxial stretching. This process can make the molecular chain in the lateral direction also form an orderly arrangement, further improving the performance of the material.

after two-way stretching treatment, BOPA has the advantages of high strength, high toughness, high barrier properties, etc., has become a widely used engineering plastics.

The above is the basic manufacturing method of BOPA. The following points should be paid attention to in the specific production process:

1. Strictly control the quality of raw materials: ensure the purity and quality of raw materials to avoid adverse effects on the polymerization and stretching process.
2. Optimize the production process parameters: According to different equipment and raw materials, optimize the production process parameters to improve production efficiency and product quality.
3. Strengthen the monitoring of the production process: through the real-time monitoring and adjustment of the temperature, pressure, tensile multiple and other parameters in the production process, to ensure the stability and reliability of product quality.

In short, the manufacturing method of BOPA involves the control of multiple links and process parameters, and it needs to be operated in strict accordance with production specifications to ensure product quality and performance. At the same time, with the continuous progress and application of science and technology, the manufacturing method of BOPA is also constantly improved and optimized, which provides more possibilities for improving production efficiency, reducing costs, and expanding application fields.
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