Polyurethane resin is a thermoplastic compound composed of diurethane, which has the characteristics of high tensile strength, good impact resistance, excellent anti-aging performance, chemical resistance, small size and light weight.
It is widely used in the manufacture of liquid seals, anti-corrosion parts, coating materials, etc., involving petrochemical, construction, automobile, electronics, medicine, food processing and other industries.
Such as anti-corrosion protection pipelines, automobile interior and exterior coatings, electronic products, pharmaceutical products, toys, etc. Polyurethane resin has attracted widespread attention in the industrial manufacturing field due to its excellent chemical corrosion resistance and multifunctional properties, and has become one of the important materials.
1)Characteristics of polyurethane resin
Polyurethane resin is a versatile material with the following characteristics:
1. Strength and durability: Polyurethane resin has good strength and durability, can withstand high pressure and heavy loads, and is suitable for various industrial applications.
2. Elasticity and flexibility: Polyurethane resin has good elasticity and flexibility, and can deform to a certain extent when subjected to force, thereby reducing the impact and vibration on the material.
3. Chemical resistance: Polyurethane resin has good chemical resistance, can resist the erosion of acids, alkalis and chemical solvents, and is suitable for use in various harsh environments.
4. Wear resistance: Polyurethane resin has good wear resistance, can resist friction and wear, and extend the service life of the material.
5. Weather resistance: Polyurethane resin has good weather resistance, can resist ultraviolet rays, oxidation and aging, and is suitable for use in outdoor environments.
6. Lightweight: Polyurethane resin has a lower density, so it is lighter than many other materials and is suitable for applications that need to reduce weight.
7. Good adhesion: Polyurethane resin can adhere well to many different materials, so it is suitable for the preparation of various coatings and adhesives
2) Classification of polyurethane resins
Polyurethane resins can be divided into various types, such as hard foam, soft foam, elastomer, and coating, according to their hardness, shape, foaming degree and other characteristics.
3)Preparation method of polyurethane resin
The preparation of polyurethane resin mainly adopts foaming processes such as one-step method and semi-prepolymerization method.
1. One-step method: The one-step method is to mix the raw materials such as polyether polyol, isocyanate and foaming agent at one time, and then foam them. This method has the advantages of high production efficiency and low cost, but the foaming uniformity is relatively poor.
2. Semi-prepolymerization method: The semi-prepolymerization method is to react polyether polyol with isocyanate to generate prepolymer, and then mix the prepolymer with the remaining polyether polyol, foaming agent and other raw materials for foaming. This method has good foaming uniformity, but low production efficiency.
4) Market prospects of polyurethane resins
It is reported that the current hot spots of polyurethane resin research are mainly concentrated on the development of new polyurethane materials, the modification of polyurethane materials, and the recycling of waste polyurethane.
As an important synthetic material, polyurethane resin has broad market prospects. Global demand is growing year by year, with a compound annual growth rate of 5.6%, and is expected to reach US$100 billion in 2025. In terms of competition, major manufacturers include BASF, Dow Chemical, etc., and my country also has competitive companies such as Wanhua Chemical.
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