Polyurethane (PUR) refers to a large class of polymers containing more urethane groups on the main chain of the molecule.
The Concept and Characteristics of Polyurethane
Polyurethane (PUR) refers to a large class of polymers containing more urethane groups on the main chain of the molecule. It is a polymer material between plastic and rubber. It has a large elongation. , Wide range of hardness, wide range of formula adjustment, excellent wear resistance and mechanical properties. Casting polyurethane elastomer (CPUR) is the most important one of the three processing types of polyurethane elastomers. Its dosage accounts for 60% of the amount of PUR. It has diversified chemical structure, easy adjustment of viscosity, excellent processing technology, easy It has the advantages of industrial production, convenient use and fast curing, so it is very suitable for making large and complex components. Polyurethane wear-resistant liner is produced and processed by casting polyurethane elastomer process. Polyurethane is a type of polymer containing urethane-type repeating structural units in the macromolecular chain. PU is a product reflected by polyisocyanate and polyether or polyester polyol in a certain proportion.
Properties of PU elastomers: The properties of PU elastomers are slightly different from those of PU elastomers synthesized from plastic polyols. Polyester PU has high mechanical properties, good oil resistance, but poor water resistance; polyether PU has better low temperature resistance and hydrolysis resistance than polyester type, but oil resistance and mechanical properties are slightly worse.
1. Wide range of hardness. It still has the elongation and resilience of rubber at high hardness. The hardness range of the polyurethane sheet is Shore A10-D80.
2. High strength. Their tear strength, tear strength and load-carrying capacity are much higher than general purpose rubbers at rubber hardness. At high hardness, its impact strength and flexural strength are much higher than those of plastics.
3. Wear-resistant. Its wear resistance is very outstanding, generally in the range of 0.01-0.10 (cm3)/1.61km, which is about 3-5 times that of rubber.
4. Oil resistance. Polyurethane board is a kind of strong polar polymer compound, which has little affinity with non-polar mineral oil, and is hardly corroded in fuel oil and mechanical oil.
5. Good oxygen and ozone resistance.
6. Excellent vibration absorption performance, can be used for vibration reduction and buffering. In the mold manufacturing industry, it can replace rubber and springs.
7. Has good low temperature performance.
8. Radiation resistance. Polyurethane has good resistance to high-energy rays, and still has satisfactory performance under the radiation
dose of 10-10 g.
9. Has good machinability. (turning, milling, grinding and drilling are available)
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