1. Introduction Thermoplastic composite material is a material with wide application value, which combines the advantages of thermoplastics and reinforcing materials, and has excellent mechanical properties, corrosion resistance and weather resistance. The in-situ molding process is an important technology in the preparation of thermoplastic composites, which realizes the molding of materials by compounding reinforcing materials and thermoplastics at a certain temperature and pressure. This article will introduce the in-situ molding process and key technologies of thermoplastic composites in detail. Second, the in-situ molding process 1Raw material preparationThe raw materials for the in-situ molding process mainly include thermoplastics and reinforcements. Thermoplastics should have good flow and thermal stability in order to maintain stable properties during processing. Reinforcement materials should be selected according to application requirements, such as glass fiber, carbon fiber, etc.
2.PreformingIn the in-situ molding process, preforming is an important step. It is to pretreat the reinforcing material at a certain temperature and pressure, so that its surface is soaked with thermoplastic to form a uniform prepreg. The preparation of prepregs is critical to the performance of the final product, so factors such as temperature, pressure, and time need to be precisely controlled. 3.After the prepreg is prepared, it is placed into a molding mold and molded by heating and pressurization. During the molding process, proper temperature and pressure should be maintained to ensure that the material flows well and is tightly bonded. After molding, the product needs to be cooled and released. 3. Key technologies 1Surface treatment of reinforcing materialsThe surface treatment of reinforcing materials is one of the key technologies of the in-situ molding process. Through surface treatment, the wettability of the reinforcement material and the thermoplastic can be improved, resulting in better interfacial adhesion. Commonly used surface treatment methods include chemical treatment, physical treatment, and plasma treatment. 2.Temperature and pressure controlIn the in-situ molding process, temperature and pressure control is critical to the performance and quality of the product. Too high a temperature can cause the material to break down or flow unevenly, while too little pressure can cause the product to loosen or holes. Therefore, the temperature and pressure need to be precisely controlled according to the nature of the raw material and the application requirements. 3.Design and manufacture of forming moldForming mold is an important equipment in the in-situ molding process, and its design and manufacturing have an important impact on product quality and production efficiency. The mold should have good thermal conductivity and wear resistance to ensure that the product can maintain stable quality and size during the molding process. At the same time, the design of the mold should take into account the structure and size of the product to facilitate demoulding and post-processing. 4.With the development of science and technology, production automation and intelligence have become an important trend in the manufacturing industry. In the in-situ molding process, the introduction of automation and intelligent technologies can improve production efficiency, reduce costs and improve product quality. For example, manual intervention can be reduced and production efficiency can be increased by introducing robots and automated equipment for operations such as the conveying of raw materials, the preparation of prepregs, and the removal of products. At the same time, through the introduction of intelligent technologies such as sensors and control systems, real-time monitoring and adjustment of the production process can be realized to ensure the consistency and stability of product quality.
4. ConclusionThe in-situ molding process of thermoplastic composites is an important preparation technology, which combines the advantages of thermoplastics and reinforcing materials, and has a wide range of application value.