Thread Content
With the development of the environmental protection industry and the improvement of people’s living standards, the demand for domestic sewage treatment equipment is increasing steadily. The environment in which wastewater treatment equipment operates is complex; in industrial atmospheres and humid conditions, various liquids cause corrosion and erosion of the equipment, as do microorganisms. This leads to frequent repairs and relatively high maintenance costs. Therefore, wastewater treatment equipment needs to be protected with coatings in order to enhance its resistance to wear, erosion, and corrosion. Wastewater treatment equipment mainly consists of components such as debris traps, filters, thrusters, aeration equipment, etc., along with a steel structure. The environment in which wastewater treatment equipment operates is characterized by urban industrial air and wastewater conditions; the corrosion mechanism involved is electrochemical corrosion. During the wastewater treatment process, aerators and steel structures are also subjected to the scouring effect of wastewater, being in a state of alternating dry and wet conditions, resulting in a relatively harsh corrosive environment. To address corrosion and wear resistance under such conditions, the properties of spray-applied polyurethane elastomers can be utilized to great effect. This spray-type polyurethane elastomer features high resistance to salt spray corrosion and excellent freeze resistance ； It also possesses advantages such as high toughness, ease of application, high hardness and strength, good plasticity, excellent resistance to bending fatigue and contact fatigue as well as other dynamic load-related properties, low tendency to adhesion, high strength and wear resistance, corrosion resistance, and self-lubrication. Additionally, spray-applied polyurethane elastomers do not age easily, exhibit low friction, and have a wide range of hardness levels (they can maintain high elasticity from Shore A30 to Shore D90). Sprayed polyurethane elastomer is a type of advanced polymer material with mature manufacturing techniques, which can be widely used in scenarios such as sewage treatment, mining, ports, power generation, and coal processing – in order to enhance the wear and corrosion resistance of mechanical equipment in such complex operating conditions. It possesses excellent properties such as wear resistance, corrosion resistance, impact resistance, salt spray resistance, aging resistance, flexibility, and strong adhesion ； In the submerged state, its wear resistance is 8 times that of cemented carbide steel, 7 times that of vulcanized rubber, and 3 times that of ultra-high molecular weight polyethylene ； It also possesses excellent adhesion properties; different primers and adhesives can be used depending on the substrate, and suitable primers and adhesives can be found for all metal and non-metal substrates ； Construction is also very convenient: it can be carried out at room temperature, and it is not sensitive to humidity or temperature ； It causes no environmental pollution, contains no volatile organic compounds (VOCs), and is a new type of eco-friendly material ； Can cure rapidly at room temperature, without a catalyst ； It has an attractive appearance, good replication of the original shape, a continuous and dense coating without seams or pores, and excellent UV protection. This spray-type polyurethane elastomer contains no more than 0.1% free isocyanate molecules, which prevents human contact with isocyanates and underscores the safe and environmentally friendly nature of this material.