PU polyurethane rubber professional introduction
PU polyurethane rubber is a kind of polymer synthetic material, which has excellent physical and chemical properties, and is widely used in the manufacture of various high performance and high added value rubber products. In this paper, the basic concepts, preparation methods, properties and application fields of PU polyurethane rubber are introduced.
First. basic concepts
PU polyurethane rubber is a polymer material formed by the reaction of polyol and isocyanate. It is an elastomer with excellent mechanical properties, wear resistance, fatigue resistance and chemical resistance. PU polyurethane rubber can be adjusted according to different formulations and process conditions, its hardness, strength and elasticity and other performance indicators to meet the needs of different application scenarios.
Second. Preparation method
The preparation of PU polyurethane rubber is mainly divided into two steps: the first step is to synthesize polymer polyol, and the second step is to react polymer polyol with isocyanate. The specific preparation process is as follows:
1. Synthesis of polymer polyols: with low molecular weight diols as the starting agent, under the action of catalysts, reaction with epoxy compounds to produce polymer polyols.
2. Synthesis of PU polyurethane rubber: Reaction of polymer polyol with diisocyanate to produce PU polyurethane rubber with high molecular weight. According to needs, additives such as chain extender and crosslinking agent can be added to adjust the properties of rubber.
Third. performance characteristics
PU polyurethane rubber has the following properties:
1. Excellent mechanical properties: It has high tensile strength, tear strength and wear resistance, which can meet the working requirements under various complex stresses.
2. Good chemical stability: It has good corrosion resistance to most organic solvents, inorganic acids and alkalis, and can be used in harsh environments for a long time.
3. Good elasticity and fatigue resistance: it can adapt to the deformation and recovery of various shapes, and has high fatigue resistance.
4. Excellent processing performance: Rubber products of various shapes and specifications can be manufactured by pouring, calendering, pressure injection and other processes.
5. Strong customization: According to different application scenarios and performance requirements, adjust the formula and process conditions to produce PU polyurethane rubber products to meet specific needs.
Fourth. Application field
PU polyurethane rubber is widely used in the following fields because of its excellent performance characteristics:
1. Automotive industry: used to manufacture automobile tires, seals, shock absorbers and other key components to improve vehicle comfort and safety.
2. Construction industry: Used in the production of building sealant, waterproof materials, thermal insulation materials, etc., to improve the air tightness, water resistance and thermal insulation performance of buildings.
3. Electronics industry: used to manufacture protective film, waterproof film, adhesive for electronic products, improve the reliability and stability of products.
4. Aerospace: Used to manufacture key components such as seals and buffer materials for aerospace equipment to improve the performance and service life of the equipment.
5. Other fields: such as petrochemical, medical equipment, sports equipment and other fields are also widely used.
In short, PU polyurethane rubber, as a high performance polymer material, has broad application prospects and market potential. With the continuous development of science and technology, its application fields will be further expanded, bringing more convenience and benefits to human production and life.
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