Due to rigid polyurethane foam ( PUrigid foam) has the characteristics of light weight, good thermal insulation effect, and convenient construction. It also has excellent properties such as sound insulation, shockproof, electrical insulation, heat resistance, cold resistance, and solvent resistance. It has been widely used at home and abroad. Used in aerospace, shipbuilding, petroleum, electronic equipment, vehicles, food and other industrial sectors.
The lower density PUhard foam is mainly used as thermal insulation (thermal insulation) material, and the higher density PUHard foam can be used as structural material (imitation wood).
PUThe thermal conductivity of hard foam is lower than that of polystyrene, other foam plastics and natural insulation materials. It has excellent thermal insulation effect. It can be cast or sprayed on site and integrated with the insulation material to achieve better insulation effect. Therefore, , In the field of thermal insulation, polyurethane foam is the first choice material and has a wide range of applications.
PUThe main uses of hard foam are as follows
1. Refrigeration and refrigeration equipment for home appliances and food industries
PUhard foam is the most ideal thermal insulation material for freezing and refrigeration equipment, and can achieve ideal thermal insulation efficiency.
Refrigerators and freezers are commonly used appliances in residential households and in industries such as the food industry. Refrigerators and freezers that use PUhard foam as the thermal insulation layer have thin thermal insulation layers. Under the same external dimensions, the effective volume is much larger than when other materials are used as the thermal insulation layer, and the weight is reduced. The weight of the appliance.
PUHard foam has high strength and is poured between the shell and lining of the refrigerator to form a whole. There is no“ Thermal Bridge“ ensures the overall excellent thermal insulation effect of refrigerators and freezers. Rigid polyurethane foam body insulation materials are generally used in the interlayer of household electric water heaters, solar water heaters and beer barrels. PUHard foam is also used to make portable insulated boxes for transporting biological products and medicines that need to be stored at low temperatures and those that need to be kept warm and fresh. of food.
With the development of fishery and meat processing industries, these foods are often processed, quick-frozen, and refrigerated on-site to reduce spoilage and improve resource utilization. The refrigeration rooms and large cold storages of enterprises in the marine fishery, meat and other food processing industries also often use polyurethane foam as insulation materials, and are often assembled with hard foam metal sandwich panels, which is convenient and fast.
2. Industrial equipment and pipeline insulation
Many brewing, chemical, storage and transportation companies have different requirements for heat preservation and cold preservation,PUHard foam is easy to construct, hygienic and has excellent thermal insulation effect. It is a good thermal insulation material.
Storage tanks and pipelines are commonly used equipment in industrial production and are widely used in petroleum, natural gas, refining, chemical industry, light industry and other industries. In order to prevent heat or cold energy from being lost during storage in the storage tank or during transportation, insulation measures must be taken for hot and cold storage tanks and pipelines.
The shapes of storage tanks include spherical and cylindrical. PUrigid foam can be constructed by spraying, pouring and pasting prefabricated foam. For large storage tanks, the spraying method is more suitable. ; Shaped by casting method. Cylindrical storage tanks with regular shapes can use the process of pasting prefabricated hard foam blocks to the outer wall of the tank.
Storage tanks for storing low-temperature media generally require a moisture-proof layer on top of rigid foam plastics. For cryogenic storage tanks for the storage and transportation of liquefied petroleum gas and liquefied natural gas (temperature lower than-30℃�Age ball (core material), softball core material, golf clubs, swimming pool equipment, etc.
Some toys and sculptures can also be made of polyurethane whole-skin semi-rigid foam and rigid foam. Artificial landscapes such as rockeries made of polyurethane are light in weight, high in strength, and easy to transport. A variety of film and television props can also be made of polyurethane foam, and a protective layer of polyurethane urea can be sprayed on the film and television prop models.
6. Potting materials and mine materials, etc.
PUhard foam material can easily seal and protect wires, such as foam filling for underground cable junction boxes in coal mines The rubber has the characteristics of high mechanical strength, flame retardant and self-extinguishing, corrosion resistance, no environmental pollution, and non-toxic solidified material. The electrical performance indicators meet the requirements and is suitable for underground on-site pouring.
Liquid polyurethane foam is used as an anchoring material. When used, the two-component mixture foams and expands, and can penetrate into the cracks. After solidification, the coal and rock mass will be bonded into one to achieve the purpose of reinforcement. In addition, PUhard foam can be used as a sealing material for radon control in uranium mines and as an explosion-proof material for mines.
7. Military and Aerospace
Polyurethane foam can also be used as the matrix of absorbing materials in non-echoic chambers and is often used in national defense and related research fields. PUhard foam absorbing material is made by adding absorbent PUhard Molded from foam composite. Polyurethane soft foam-based absorbing material is made by cutting block foam into predetermined shapes, impregnating it with absorbing agent and then drying it.
The American Rantic company developed a suitable 60MHz~40GHzultra-wideband EMC series of wave absorbers, which adopt soft polyurethane foam carburized structure, are mostly in the shape of a wedge, and the height ranges from 0.6 ~2.5mvarying, suitable for building non-echo chambers for different purposes.
Polyurethane foam absorbing materials can also be used on the fuselage and wings of stealth aircraft;can be used to build echo-free boxes to cover reflective objects in the test environment. Such as radar antenna warehouse, antenna bracket, turntable, test stand, etc.;Polyurethane foam-based absorbing materials can also be used to build microwaves Absorbent walls, eliminate microwave contamination and more.
Polyurethane foam is also used as camouflage material for military facilities. It uses sprayed PUhard foam material as the base and adds different additives and fillers to prevent optical reconnaissance and thermal infrared reconnaissance. and anti-radar reconnaissance materials, which can simulate the natural surface state and achieve “hiding the truth and showing the false” ‘s disguise purpose.
PUHard foam is also used as thermal insulation material for aerospace aircraft and so on. PUhard soaked at -45~100℃It has excellent temperature and cold resistance and thermal insulation properties in the temperature range, and is very suitable for use as thermal insulation materials in the aerospace industry.
8. Polishing pads
Polishing pad is an important part of the chemical mechanical polishing (CMP) system and is also the main consumable. Used for polishing various optical glass components, stainless steel, gemstones, semiconductor single crystal wafers, etc. Polyurethane polishing pad is a hard porous polyurethane material with stable chemical and tribological properties. It is a high-performance polishing material. During the polishing process, the micropores on the surface of the polyurethane polishing pad can soften and roughen the surface of the polishing pad, and can keep abrasive particles in the polishing fluid.
The more famous polyurethane polishing pad is produced by the American RodelIC1000 Type round polishing pad, its standard thickness1. 27mm(50mils ) and 2.0m, hardness ShaoD57, compression rate2.25%, densityBetween 0.63~0.80g/cm3. Some domestic manufacturers produce various specifications of round and square polyurethane polishing sheets, thickness0.5~5.0mm, Shao AHardness55~96, Generally contain abrasives, and some products do not contain fillers.
�The polyurethane polishing pad is produced by the American RodelCompanyIC1000 in a round shape Polishing pad, its standard thickness1. 27mm(50mils) and 2.0m, hardness ShaoD57, compression rate2.25%, density Between 0.63~0.80g/cm3. Some domestic manufacturers produce various specifications of round and square polyurethane polishing sheets, thickness0.5~5.0mm, Shao AHardness55~96, Generally contain abrasives, and some products do not contain fillers.
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