Polyurethane exhibits excellent physical and chemical properties and has been widely applied in mining machinery in recent years. As a synthetic polymer material, polyurethane shares similarities with rubber in terms of wear resistance, elasticity, and strength, making it suitable for many applications where rubber is traditionally used. However, compared to rubber, polyurethane offers several advantages, such as greater flexibility in shaping according to specific requirements and the ability to achieve a wide range of hardness levels.
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1. **Wide Hardness Range**: Even at high hardness levels, polyurethane maintains good elasticity and elongation, making it highly versatile.
2. **High Strength**: It has significantly higher tensile and tear strengths than rubber at similar hardness levels. At plastic-like hardness, its impact and bending strengths are much greater than those of conventional plastics.
3. **Excellent Wear Resistance**: Known as “wear-resistant rubber,†polyurethane performs exceptionally well under wet conditions, often outperforming ordinary rubber by several times. While metals like steel may be hard, they are not always wear-resistant.
4. **Shock Absorption and Environmental Resistance**: Polyurethane also provides good resistance to oil, impact, low temperatures, radiation, and air permeability, along with strong load-bearing and insulation properties.
However, polyurethane does have some limitations. First, it generates internal heat and has average high-temperature performance. It is not very resistant to heat and humidity, and its normal operating temperature should not exceed 120°C. In high-frequency vibration environments, it requires proper cooling. In slurry pumps, this drawback is actually turned into an advantage, as the submerged operation helps dissipate heat, protecting the coating. In other words, what might be a disadvantage for rigid coatings becomes a benefit for polyurethane elastomers.
Second, polyurethane is sensitive to strong polar solvents and acidic or alkaline media. At certain temperatures, substances like alcohol, acid, and ketones can cause swelling and degradation. Solvents such as dichloromethane and trichlorethylene can also lead to swelling at room temperature.
Qinhuangdao, introduced by Canada's Hao Engineering Co., Ltd., is a new type of polyurethane elastomer designed to address some of the limitations of traditional polyurethane. This material retains all the original excellent physical and chemical properties while solving specific issues in construction applications. Its Shore hardness ranges from A45 to D60, allowing for customization based on environmental conditions. By increasing the number of polar groups and utilizing hydrogen bonding to enhance intermolecular forces, it effectively extends the service life of the coating.
In addition, this material resists erosion, cavitation wear, and can withstand pH levels between 3 and 11, making it highly resistant to both acidic and alkaline corrosion. It protects parts from water erosion, cavitation, and chemical damage, making it a truly universal surface treatment solution. This versatile material is widely used in various industrial fields requiring anti-corrosion and wear-resistant protection, with proven success in practical applications.
Facts show that the adhesion between this material and the substrate is extremely strong, and the coating life is generally ten times longer than that of conventional metal materials, delivering significant economic benefits.
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