Manufacturing method of PA6T
PA6T (polyamide 6T) is a high-performance engineering plastic with advantages of high temperature resistance, chemical resistance, high mechanical strength, etc. It is widely used in automobiles, electronic and electrical appliances, aerospace and other fields. This article will introduce the manufacturing method of PA6T.
I. Raw material preparation
1. Hexamethylenediamine: Hexamethylenediamine 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 is used to react with Hexamethylenediamine to generate PA6T.
II. Synthesis reaction
The synthesis reaction of PA6T adopts the polycondensation reaction, that is, under the condition of high temperature and high vacuum. Under the condition of high temperature and high vacuum, the condensation reaction of adipic acid and terephthalic acid occurs to produce PA6T. The specific steps are as follows:
1. Add adipic acid and terephthalic acid into the reactor according to a certain molar ratio.
2. The condensation reaction is carried out under high temperature (generally at 250-300°C) and high vacuum (generally at 10-30 mmHg).
3. As the reaction proceeds, water vapor is constantly generated and needs to be discharged from the reactor in time to maintain the stability of the reaction system.
4. At the end of the reaction, high molecular weight PA6T resin is obtained.
3. Post-treatment
1. Cooling: Cool the PA6T resin to room temperature after the reaction.
2. Pelletizing: Cut the cooled PA6T resin into pellets of certain lengths to facilitate subsequent processing and molding.
3. Drying: Dry the PA6T pellets after cutting to remove water and other volatile substances.
4. Quality Control and Testing
1. Molecular Weight Detection: Gel Permeation Chromatography (GPC) is used to detect the molecular weight and molecular weight distribution of PA6T.
2. Thermal property detection: Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) are used to detect the thermal stability, melting point and other thermal properties of PA6T.
3. Mechanical property test: adopt tensile test, bending test, impact test and other methods to test the mechanical properties of PA6T.
5. Packaging and storage
The tested PA6T granules will be packaged, generally using moisture-proof, light-proof bags, and then stored in a dry, cool, ventilated place, avoiding 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, as well as packaging and storage. During the manufacturing process, the process parameters of each step need to be strictly controlled 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 in the production process, and comply with the relevant laws and regulations and standard requirements.
