Advantages and disadvantages of tpu material

2022-10-17 10:19:47 Rowling

Advantages and disadvantages of tpu material

Advantages of TPU:

1. Excellent wear resistance. Especially under the working conditions where there are wetting media such as water and oil, its wear resistance is often several times and dozens of times that of ordinary rubber materials. Although metal materials such as steel are very hard, they are not necessarily wear-resistant. For example, in the large-scale water pump in the Yellow River irrigation area, the metal mouth ring and protection ring of the over-current components have been washed by a large amount of sediment, and they will be severely worn and leaked within a few hundred hours. , and the mouth ring and protective ring covered with polyurethane elastomer have been continuously operated for 1800 hours without being worn. Others, such as the rubber rollers for rice milling, vibrating screen sieves for coal preparation, track race tracks in sports fields, dynamic oil seals for cranes and forklifts, elevator wheels and roller skate wheels, etc. are also polyurethane elastomers. of use. A point to be mentioned here is that in order to improve the friction coefficient of low and medium hardness polyurethane elastomer parts and improve the wear resistance under load, a small amount of aluminum disulfide, graphite or silicone oil can be added to this type of polyurethane elastomer. lubricant.

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2. Through the selection of raw materials and the adjustment of the formula, it can be changed within a certain range to meet the different requirements of users for product performance. For example, hardness is often an important indicator for users of products. Polyurethane and elastomer can be made into soft printing rubber rollers with Shore A hardness of about 20, and hard steel rolling rubber with Shore D hardness of more than 70. Roller, which is difficult for general elastomer materials. Polyurethane elastomer is a polar molecular material composed of many flexible segments and rigid segments. As the ratio of rigid segments increases and the density of polar groups increases, the original strength and hardness of the elastomer will increase accordingly.

3. Various processing methods and wide applicability. Polyurethane elastomers can be molded by plasticizing, kneading and vulcanization (refer to MPU) like general-purpose rubbers; they can also be made into liquid rubber, cast molding or spraying, potting, centrifugal molding (referring to CPU); also It can be made into pellets, like ordinary plastics, and molded by injection, extrusion, calendering, blow molding and other processes (referring to CPU). Molded or injection molded parts can also be processed by cutting, grinding, drilling and other machining within a certain hardness range. The diversity of processing makes the applicability of polyurethane elastomers very wide, and the application fields continue to expand.

4. Oil resistance, ozone resistance, aging resistance, radiation resistance, low temperature resistance, good sound permeability, strong adhesion, excellent biocompatibility and blood compatibility. These advantages are the reason why polyurethane elastomers are widely used in military, aerospace, acoustics, biology and other fields.

Disadvantages of TPU:

1. Not resistant to strong polar solvents and strong acid-base media. At a certain temperature, alcohols, acids and ketones will swell and degrade the polyurethane elastomer, and solvents such as chloroform, dichloromethane, dimethylformamide, and trichloro-Zene will swell the polyurethane elastomer at room temperature.

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2. Large endogenous heat and general high temperature resistance. The normal operating temperature range is -40~120°C. If it needs to be used for a long time under high frequency oscillation conditions or high temperature conditions, corresponding modification measures must be taken in structural design or formula. The above advantages and disadvantages of TPU are shared here. Because TPU has special properties such as excellent mechanical properties, elasticity, high wear resistance, chemical resistance and excellent biocompatibility... One of the most important materials in necessities, industrial applications and medical industries.

Author Rowling


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