What is POLYUREA? Polyurea-based spray coatings began their development in the US military, the Soviet Union in the mid-20th century. And it applied rapidly in the late 80’s in the US and Canada in the civilian field.
1. What is POLYUREA?
First, the most notable concern was demonstrated in the application of polyurea as a protective layer for sprayed polyurethane foam on roofs. The anti-wear polymer coating of pickup truck body is popular in the US and during oil pipeline repair … Then the application of polyurea has been introduced in many industries, construction, delivery information, military, from tank protection to bulletproof coating for buildings and guard stations … of many countries around the world. The list of uses for polyurea has become quite impressive. And so far polyurea is being used more and more in all applications.
North American polyurea production has reached hundreds of thousands of tons per year and in Korea several tens of thousands of tons per year … Tốc độ phát triển of polyurea technology is observed in Asia. In a more conservative Europe, the coatings market develops quite smoothly.
However, today we can easily observe polyurea coating on rooftops in Naples and on ships from Germany, not to mention the use of polyurea to protect metal structures, tanks and pipes. Increasingly strict technical requirements bring increasing interest in the application of polyurea in Vietnam. There is a great need for effective materials for waterproofing and anti-wear, marine corrosion adaptive to extreme climatic conditions.
Polyurea application adopts a high pressure, multi-component, high pressure reactor spray coating equipment, capable of supplying raw materials at paint spray guns at a minimum spray pressure of 2000 psi and material temperature of 60°C. – 8 0°C (depending on geographical location). Gracoplural multi-component reactors use multi-component air crash mixing heads and the commonly used mechanical air discharge gun.
2. The main physical properties of Polyurea
1. Colloidal time
Fast gelatinization time of Polyurea (5-15 seconds). With fast reaction time polyurea does not react easily with moisture and moisture in the substrate. Hence the material can be easily applied on cold or damp substrates, such as steel, concrete, wood or PU foam. On the other hand, when the flow of the material is smoother, it will slow down in the range of 20-60 seconds. The fast response time is a big advantage of polyurea.
In the case of facility maintenance the owner wants to get back to use the equipment as soon as possible. A fast reactive polyurea cures completely within hours, while most polyurethane or epoxy coatings need 24-48 hours, before coated areas can be used to their full potential.
Polyurea cures the pipes quickly and is restored almost immediately. Many pipelines around the world, including the Trans-Alaska Pipeline or Druzhba main oil pipeline use this technology to speed up transportation and keep maintenance costs to a minimum.
2. Humidity is not sensitive
Polyurea is superior to any product on the market today, applicable in conditions of high humidity (up to 98%) and low temperature (up to -30°C). Polyurethane can be sensitive to high humidity and moisture in substrates.
As a result, they react with high atmospheric humidity or humidity to produce carbon dioxide gas and cause foam. In contrast, polyurea is not affected by moisture. The reaction of the polyurea system is so rapid that no moisture reaction can occur.
Polyurea waterproof material systems are insensitive to moisture and generally do not produce carbon dioxide bubbles. This is an advantage in climates or regions with high humidity or dew point. Overall polyurea waterproof material is a more flexible protective coating for concrete.
Recent innovations have resulted in the blending of epoxy and polyurea to form materials ideal for waterproofing bridge decks, parking decks and industrial floors, aggregates that can be added to improve traction for vehicles and anti-slip for pedestrians.
3. Excellent adhesion
If the substrate is moist or in continuous immersion, polyurea will perform much better than polyurethane. Many industry insiders were surprised at how polyurea videos were sprayed onto the ice and water without affecting the reaction of the ingredients.
A properly prepared surface improves adhesion, especially for critical applications such as moist concrete for linings and floors, as well as protects the adhesion of geotextiles, wood and steel. . In these applications the polyurea system will have the best results.
4. High tensile strength
In waterproofing applications a low elastic modulus (high elasticity) is required to meet the challenge. Traditionally, polyurethane is considered to have higher elongation and lower elastic modulus than polyureas with similar hardness. However, modern advances in chemistry mean that polyureas are made to feel as soft and elastic as polyurethane.
This opens up opportunities for OEMs who manufacture “vinyl like” leather to choose polyureas. The new polyurea will last with much less force, and more importantly polyurea will resist puncture and strong water. The composite fabrication and OEM industries have seen a leap in using polyurea as an alternative to the unsaturated polyester vinyl ester and fiberglass polyester for open mold production. .
Body and highway cladding panels, bumpers and other parts are just a few of the parts that can easily be produced faster and without harmful emissions.
Many manufacturers in the marine, bathroom and recreational vehicle industries can also switch to polyurea as a reliable, cost-effective alternative. FRP system. The polyurea’s low volatile content also makes it very attractive for confined workspaces. Hence, polyureas are ideal for applications such as wall and floor paints for the food and beverage industries.
5. High abrasion resistance
In environments with high wear resistance, polyurea performs very well. In applications once thought to require high-solids polyurea epoxy are slowly winning. In the railway and barge industry polyurea is used for its superior elongation and high impact resistance.
Epoxy will crack and blister when exposed to constant impact. The durability and physical properties of polyurea have made it the system of choice for the rapidly growing truck flooring industry. Polyureas are sprayed in a uniform texture over wear-resistant metal floors.
6. Heat resistance and fire resistance
When it comes to heat resistance and fire resistance, polyureas have an advantage over equivalent formulated polyurethane. Due to the polyurea’s formulation has a tough structure and excellent resistance to thermal deformation while polyurethane has a tendency to heat sag. Fire resistance (flame spread, grade): Class 2, grade A with roofing materials.
Polyureas that contain no exposed volatile organic compounds (VOC) volatile organic compounds (VOCs), are widely used in applications such as concrete coatings or geotextiles for secondary containment applications. The Polyurea’s quick fix time allows it to be quickly applied to a prepared substrate with minimal downtime for the facility.
This has made polyureas the choice of facility managers for surrounding walls and floors to store chemicals such as dilute acids (concentrations below 15%), alkalis, saline solutions, solvents. organic and oil. Polyureas provide a strong barrier against permeation, corrosion and spillage to the environment. In this type of application polyureas easily fit foundations, underground structures, pipes, tanks and exposed structural sections to form a complete coating.
In a world of increasing environmental awareness, polyurea has proven to be an optimal and economical choice for governments and businesses. Polyurea shortens the repair time as quickly as possible, with elasticity, hardness, high waterproofing resistance, chemical resistance to abrasion or corrosion, and fire resistance … demanding and demanding. Nozzle innovation and application equipment is being introduced faster than ever to meet the need for better, more efficient vehicles.
NEWTEC is proud to be the leading polyurea coating service provider in Vietnam. In addition, NEWTEC is also the construction unit for hand-sweeping cold polyurea, polyurea coating, waterproof polyurea coating … Hope to bring Optimal solution to meet all customer requirements.