What is the production process of PU backings?
Publish Time: 2025-03-12
As a high-performance material, PU backings are widely used in carpets, automotive interiors, packaging materials and other fields. Its excellent elasticity, wear resistance and weather resistance make it the preferred backing material in many industries. So, what is the production process of PU backings?The production of PU backings begins with the preparation of raw materials. The two main raw materials for the production of polyurethane are polyols and isocyanates. The selection of these raw materials has a crucial impact on the performance of the final product. Polyols are usually derived from petroleum resources, and bio-based polyols, such as vegetable oil-based polyols and wood fiber-based polyols, can also be used. The addition of these bio-based raw materials is not only environmentally friendly, but also gives PU backings better performance. Isocyanate is the key component that reacts with polyols, and its selection determines the degree of crosslinking and hardness of PU backings.After the raw materials are prepared, the next step is the synthesis process of polyurethane. This step is usually carried out in a specific reaction equipment, such as a reactor. Polyols and isocyanates are mixed in a certain proportion in the reactor and react at a certain temperature and pressure. During the reaction, the reaction conditions, such as temperature, pressure and reaction time, need to be strictly controlled to ensure the smooth progress of the reaction and the quality of the product.After the reaction is completed, the obtained polyurethane mixture needs to be further processed. This includes degassing, filtering and blending the mixture to remove impurities and bubbles in it to ensure the uniformity and stability of the final product. Degassing and filtering are key steps to prevent defects in the product, and they can ensure that the PU backings have good performance during subsequent processing and use.Next is the molding process of the PU backings. This step usually involves coating the polyurethane mixture on a substrate, such as glass mesh cloth or sub-base cloth. After coating, the substrate needs to be sent to an oven or hot air drying tunnel for curing. During the curing process, the polyurethane mixture undergoes a cross-linking reaction to form PU backings with high strength and elasticity. The choice of curing temperature and time has an important impact on the performance of the final product and needs to be adjusted according to the specific formula and application scenario.After the curing is completed, the PU backings also need to undergo a series of subsequent treatments, such as trimming, cutting and inspection. Trimming and cutting are to process the backing into the required size and shape, while inspection is to ensure that the quality and performance of the final product meet the standards.The production process of PU backings is a complex and delicate process involving multiple steps such as raw material preparation, synthesis, processing, molding and subsequent processing. Each step requires strict control of process parameters and quality requirements to ensure the performance and quality of the final product. With the advancement of science and technology and the improvement of environmental awareness, the production process of PU backings is also constantly being optimized and innovated to meet the market demand for high-performance and environmentally friendly materials.
