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[Chemical Knowledge]：PA6T manufacturing method and process flow

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PA6T manufacturing method

PA6T (polyamide 6T) is a high-performance engineering plastic, with high temperature resistance, chemical resistance, high mechanical strength and other advantages, widely used in automobiles, electronic appliances, aerospace and other fields. This article will introduce the manufacturing method of PA6T.

1. Raw Material Preparation

1. Hexanediamine: Hexanediamine is one of the main raw materials of PA6T, which is used to react with terephthalic acid to generate PA6T.
2. Terephthalic acid: Terephthalic acid is another main raw material of PA6T, which reacts with hexamethylene diamine to form PA6T.

2. synthesis reaction

PA6T synthesis reaction using polycondensation reaction, that is, at high temperature, high vacuum conditions, hexamethylene diamine and terephthalic acid condensation reaction to generate PA6T. The specific steps are as follows:

1. hexamethylene diamine and terephthalic acid are added into a reaction kettle according to a certain molar ratio.
2. The polycondensation reaction is carried out under the conditions of a high temperature (generally at 250 to 300 ° C.) and a high degree of vacuum (generally at 10 to 30mmHg).
3. As the reaction proceeds, water vapor is continuously generated, and the reactor needs to be discharged in time to maintain the stability of the reaction system.
4. After completion of the reaction, a high molecular weight PA6T resin is obtained.

3. Post-treatment

1. Cooling: The PA6T resin after completion of the reaction was cooled to room temperature.
2. Pelletizing: The cooled PA6T resin is cut into pellets of a certain length to facilitate subsequent processing and molding.
3. Drying: The pelletized PA6T pellets are dried to remove moisture and other volatile substances.

4. quality control and detection

1. molecular weight detection: the molecular weight and molecular weight distribution of PA6T were detected by gel permeation chromatography (GPC).
2. Thermal performance detection: The thermal stability, melting point and other thermal properties of PA6T were detected by thermal reanalysis (TGA) and differential scanning heat method (DSC).
3. mechanical properties testing: tensile test, bending test, impact test and other methods to detect the mechanical properties of PA6T.

5. packaging and storage

will test qualified PA6T pellets for packaging, generally using moisture-proof, light-proof bags, and then stored in a dry, cool, ventilated place, to avoid direct sunlight and high temperature environment.

In short, the manufacturing method of PA6T mainly includes the steps of raw material preparation, synthesis reaction, post-processing, quality control and testing, and packaging and storage. In the manufacturing process, it is necessary to strictly control the process parameters of each step to ensure the stability and reliability of product quality. At the same time, it is also necessary to pay attention to the safety and environmental protection issues in the production process and comply with relevant laws, regulations and standard requirements.

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