Reactive jet molding（REACTION SPRAYING MOLDING）Also known as polyurethane elastomer and rigid polyurethane molding technology, it is a new type of pollution-free molding technology developed abroad in the past decade. With its excellent physical and chemical properties, excellent processability, and environmental friendliness, it fully demonstrates unparalleled superiority over traditional coating technology and has developed rapidly. It is widely used in fields such as construction, shipbuilding, energy, water conservancy, transportation, machinery, electronics, chemical industry, mining, environmental protection, and sports and entertainment, demonstrating strong vitality.

Our company has recently introduced the United StatesREACTORSpray coating equipment, specifically designed for polyurethaneⅢProduction and manufacturing of elastomers. Adopting hydraulic drive, with a large output (up to)10.8kilogram/High work pressure (up to)241Small pressure fluctuations and high electric heating power (up to)12kwperhaps18kw）A stable material conveying system, precise material metering system, uniform material mixing system, excellent material atomization system, convenient material cleaning system, accurate temperature control, and the ability to spray high-quality coatings. Our company can provide customers with supporting services from surface treatment, materials, and process manufacturing, as well as on-site construction.
PolyurethaneⅢ / RIMThe technology has comprehensively broken through the limitations of traditional environmentally friendly coating technology, and can replace traditional rubber lining, fiberglass lining, heavy-duty anti-corrosion coating, and plastic coating（PVC/PP/PPR）Anti corrosion treatment of general chemical storage tanks, oil tanks, sewage tanks, neutralization tanks and other equipment and facilities such as lining and spraying. The material construction is seamless, eliminating leakage hazards caused by joints and avoiding overall failure. The construction process does not pollute the environment, and the construction quality is easy to control. Hardness and toughness can be adjusted from the material factory, and are not easily cracked under thermal stress or impact. There is no corrosive medium infiltration caused by pinholes due to solvent evaporation, and polyurethane spraying is usedⅢThe technology effectively solves the shortcomings that general anti-corrosion materials cannot overcome, with outstanding resistance to media such as water, acid, alkali, salt, oil, etc. It has good adhesion and will not fall off after long-term use; Good UV aging resistance, no powdering or cracking after long-term outdoor use. Practice has proven that spraying polyurethaneⅢTechnology is a highly advanced and efficient anti-corrosion measure that has been favored by a large number of Chinese users. Spray coating technology - polyurethaneⅢIt is a new type of product developed abroad in the past decade, following the development of high solid coatings, water-based coatings, UV curable coatings, powder coatings and other anti-corrosion and waterproof materials.

PolyurethaneⅢOverview of the medium resistance performance of elastomers

PolyurethaneⅢThe material is dense, continuous, and seamless, and its drying and curing process relies entirely on chemical reactions, without the need to evaporate organic solvents or moisture into the air like in the drying process of traditional paints and coatings. Therefore, there will be no defects such as pinholes, bubbles, shrinkage holes, etc., which actually eliminates the way for external corrosive media to invade, so the anti-corrosion performance is very outstanding. At the same time, due to its excellent flexibility, it can fully resist the thermal expansion and contraction caused by temperature changes in the day, night, and four seasons, without cracking or falling off, making polyurethaneⅢThe excellent chemical resistance of the material surface has broad application prospects in the field of material protection. In addition, polyurethaneⅢThe oil resistance of elastomers is outstanding, comparable to that of nitrile rubber. Therefore, polyurethaneⅢThe technology can be widely used in the field of oil resistance. More popular in the military field, soft oil storage tanks are mainly used for temporary storage of gasoline, diesel and other fuels for urgent needs. This fuel tank can be double-sided polyurethane coated on fiber-reinforced non-woven fabricⅢMade with the characteristics of small quality, easy folding, convenient transportation, hydrolysis resistance, aging resistance, etc., it can be used outdoors for a long time. In addition, polyurethaneⅢTechnology can also be used to produce aircraft soft fuel tanks, soft oil pipelines, aircraft aerial fuel bags, and fire hoses.

PolyurethaneⅢExtremely high impact and abrasion resistance

PolyurethaneⅢHas extremely high adhesion and abrasion resistance, with excellent adhesion to various substrates such as cement, steel, wood, etc., without cracking or falling off. It is sprayed with polyurethane on the deck of aircraft carriers abroadⅢIt fully utilizes its anti-corrosion and high wear resistance characteristics, such as polyurethaneⅢSuccessfully withstood the test of aircraft takeoff and landing crushing and abrasion, as well as seawater splashing and abrasion. And it also led people to discover polyurethaneⅢExtremely resistant to photo oxidative aging. Tested by professional departments, it has been proven that polyurethaneⅢThe thermal stability is very good, but it can120℃Long term use; High elastic modulus, its hardness can be in the range of Shore A30-90Adjust freely between them; Due to its100%The solid content is high, with no organic matter volatilization, and meets the latest international environmental standards. The Environmental and Health Related Product Safety Institute of the Chinese Center for Disease Control and Prevention has issued a statement on polyurethaneⅢVerified that it meets the requirements for drinking water hygiene and safety products. US Navy testing, polyurethaneⅢAnti cavitation corrosion is epoxy150Double! In recent years, polyurethane has been widely used abroadⅢSpraying technology, such as Incheon Airport in South Korea, St. Matt Cross Sea Bridge in the United States, various ships, oil platforms, buildings, thermal insulation, spraying foam layer and adding polyurethaneⅢPolyurethane can be seen almost everywhere in coverage, anti-corrosion and anti-seepage of sewage treatment plant water tanks, etcⅢThe figure.　　
The experiment adopts a newly modified circular ring impact abrasion tester, and the specimen is a concrete circular ring test block with an outer diameter of500mmThe inner diameter is300mm, Gao Wei100mmApply interface agent to the inner surface of the test piece that has been punched and ground,5～6hPost spray polyurethaneⅢElastic coating1～1.5mmThick,7dAfterwards, conduct a grinding test. The sediment concentration of the experimental water flow is10%The flow rate is40m/sOne flushing time30minGrind twice in total.

PolyurethaneⅢComparative analysis of anti abrasion protective layer and traditional protective layer
　
Compared with epoxy resin coatings and epoxy resin mortar, and compared with traditional epoxy resin coatings and epoxy resin mortar anti abrasion protective layers, polyurethaneⅢThe technical advantages of the anti impact and abrasion protective layer of elastomers are very obvious. On the one hand, in terms of material physical and mechanical properties and aging resistance, it is incomparable to epoxy resins. On the other hand, in terms of construction performance, polyurethane is preferredⅢThe elastic protective layer can be applied to buildings with complex shapes such as curved surfaces, inclined surfaces, and facades, and can effectively maintain the basic form of the construction building. Construction is fast and efficient. The coating curing speed is fast, the strength increases quickly, and after construction1dYou can walk on it; The construction period and the protection period of the coating are short, usually the maximum after construction7d(general3d)It can be put into use immediately. However, the epoxy resin mortar or resin coating is difficult to achieve such excellent construction performance. It is difficult to construct on curved surfaces, inclined planes and facades. The gel takes a long time and is prone to sagging. In addition, the construction method is mostly manual painting, and the construction quality is difficult to control. The construction period and coating protection period are long, which are greatly affected by environmental conditions. Therefore, from a technical perspective, spraying polyurethaneⅢThe construction of elastomeric anti abrasion protective layer has obvious progressiveness, which can be applied in large areas on the dam overflow surface, spillway, spillway tunnel, discharge hole, stilling basin and other parts of the water release structure subject to high-speed water scouring and abrasion.
　　
From an economic perspective, polyurethane of the same thicknessⅢThe direct construction cost per square meter for the impact resistant protective layer of elastomers is only equivalent to that of epoxy resin mortar1/2～1/3And its resistance to impact and abrasion is its5More than double. Compared with pure epoxy resin coating, polyurethaneⅢThe direct construction cost of the impact resistant protective layer for elastomers is approximately2Double, but its anti impact and abrasion performance is superior5～10Twice. Therefore, polyurethane is adoptedⅢThe economic advantages of the impact resistant protective layer of elastomers are also considerable.
　
Comparison with high-strength concrete anti abrasion layer by spraying polyurethaneⅢThe elastic protective layer is coated with a thickness of2mmBased on current prices, the cost per square meter is estimated to be equivalent to the construction cost of the high-strength concrete protective layer on the surface of the spillway, including supporting technologies. On the one hand, the impact and abrasion resistance of high-strength concrete is not as good as that of sprayed polyurethaneⅢThe impact resistant layer of elastomers1/10On the other hand, cracks in high-strength concrete construction are difficult to effectively control, often resulting in large areas being washed away. If repaired according to concrete engineering“Five fold law”Rule, then use spray coating of polyurethaneⅢElastic anti abrasion protective layer can improve the service life of the anti abrasion layer and save unnecessary repair and reinforcement costs by approximately per square meter1000～1500Yuan, and it can also avoid unnecessary losses to the normal production of hydropower stations due to repair and reinforcement. Therefore, its comprehensive benefits are very considerable. PolyurethaneⅢAdhesion of materials(MPa)PolyurethaneⅢThe material has good adhesion to various substrates such as metal, concrete, plastic, and wood. Through appropriate formula screening, it can be obtained that the adhesion strength exceeds that of polyurethaneⅢThe system of its own strength.