Polyurea is very suitable and beneficial to the construction of pipelines and the repair of pipeline anticorrosion layers. The construction of pipeline projects may encounter any extreme environmental conditions. Although the construction of new pipelines can choose a suitable construction period and environment, the maintenance and repair of old pipelines occur randomly and should be carried out at any time . For a long time, it has been almost impossible for people to apply protective coatings of various paints in winter in cold regions . Because conventional epoxy coatings, polyurethane coatings and other liquid coatings are impossible to solidify into a film in a sub-zero environment. Spray polyurea coatings make possible the application of protective coatings in such environments. Therefore, people say that the emergence of spray polyurea is a great revolution in coating technology, which has completely broken through the limitations of traditional coating coating technology and has become a miracle in the coating industry .
(1) It can be sprayed. It can also be painted by hand, with flexible painting methods and strong usability.
During the construction of high-pressure spraying polyurea elastomer, the two-component coating is heated by itself in the spraying equipment, and the painted pipes do not need to be heated . The coating equipment is simple and and tees. problem.
In particular, the advent of hand-brushed polyurea provides a very convenient construction and on-site . It can also provide a convenient means for repairing wounds of pipeline construction in mountainous areas or complex terrains and areas.
It can be said that the spraying operation of polyurea anti-corrosion coating is flexible, unlike fusion-bonded epoxy powder coating and three-layer polyethylene anti-corrosion coating , which require a complex set of production lines and equipment.
(2) 100% solid star-containing, no volatile organic compounds, in line with environmental protection requirements.
(3) The design thickness of the coating (from hundreds of microns to several millimeters) can be achieved in one construction, unlike other liquid coatings, which require multiple coatings to achieve the required coating thickness, which greatly improves the spraying efficiency .
(4) The thermal stability is higher than that of the three-layer polyethylene anti-corrosion layer and the fusion-bonded epoxy powder coating. It can work at 120 ℃ for a long time and can withstand short-term thermal shock at 150 ℃, so it has a wider working temperature range.
(5) The performance of the coating film can be adjusted according to the needs of pipeline construction, such as: high wear resistance or high impact performance , high hardness and UV resistance, etc., so it is very suitable for pipeline construction. The handling , loading and unloading , its good mechanical properties can completely resist the occurrence of mechanical damage.
(6) It has good bonding performance with the steel pipe surface. When the steel surface pretreatment reaches Sa 2.5 level and the surface paving depth is 40~75μm, it can be directly sprayed with polyurea coating, and the ligation strength is tested at 25°C It can reach 80N/cm, and the cathodic disbonding radius is 2mm, which shows that this kind of coating has good adhesion to the steel surface. This can ensure that the anti-corrosion layer of the pipeline will not peel off under the action of soil stress.
To sum up, as a new type of pipeline anti-corrosion coating, Polypig has the irreplaceable construction performance of other coatings, and also has the protective performance and mechanical properties that various pipeline anti-corrosion coatings should possess.
