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What is a one-component polyurethane waterproof coating ? In the home improvement, the roof and the bathroom inevitably need to use waterproof coating, but how many people understand the waterproof material? In the following article, Xiaobian introduced a waterproof coating with better waterproof properties: polyurethane waterproof coating. Specifications for polyurethane waterproof coatings, waterborne polyurethane waterproof coatings, and polyurethane waterproof coatings are covered in the following articles.
First, polyurethane waterproof coating concept, characteristics, price, scope of application
Polyurethane waterproof coating is a one-component environment-friendly waterproof coating for liquid construction. It is based on imported polyurethane prepolymers and has no additives such as tar and asphalt. It is cured by contact with moisture in the air and forms a solid, tough, jointless overall waterproof film on the surface of the substrate.
Features
(1) Can be applied directly on wet or dry surfaces.
(2) With strong adhesion to the base surface, the polymer material in the coating film can penetrate into the fine sipes on the base surface and follow the strong type. High adhesive strength, waterproof material applied and concrete, wood, ceramics, etc. have a strong adhesive force, can also be applied to some of the polymer membrane adhesive;
(3) The coating film has good flexibility, adaptability to stretching or cracking of the base layer, and high tensile strength.
(4) Green, non-toxic, odorless, non-polluting environment and no harm to human body. This product removes coal tar and greatly reduces environmental pollution.
(5) Weather resistance is good, high temperature does not flow, low temperature does not crack, excellent anti-aging properties, oil resistance, wear resistance, ozone resistance, acid and alkali resistance.
(6) After the two-component polyurethane is cured, it forms a flexible and seamless seamless whole, which improves the waterproof and impermeability of the construction project, and has the advantages that the coiled material is incomparably waterproof; the coating film is dense and the waterproof layer is complete. No cracks, no pinholes, no bubbles, water vapor permeability coefficient, both waterproof and gas barrier function.
(7) Simple construction, short construction period and easy maintenance
(8) According to needs, can be equipped with various colors
(9) Light weight, no increase in building load
Polyurethane waterproof coating prices are generally in the range of 15 yuan / kg, the specific circumstances should be based on polyurethane waterproof coating brand, efficacy and other aspects of comprehensive consideration, but the price is not volatile.
Scope of application
Various kinds of roof waterproof, underground indoor and outdoor waterproof and kitchen, toilet and bathroom between the waterproof and all kinds of pipes, tanks and other equipment corrosion, can also be used for wood flooring, cement products, ceramic products and other materials, such as bonding. It is even suitable for use in high-speed railways, subways, highways, granaries and other projects, when used in subways and basements.
Second, waterborne polyurethane waterproof coating
Polyurethane waterproof coatings can be divided into single and double components.
One-component polyurethane waterproof coating, also called moisture-curing polyurethane waterproof coating, is a reactive moisture-curing film-forming waterproof coating. When applied to the waterproof base layer, it reacts with moisture in the air to cure and crosslink into a tough, soft and seamless rubber waterproofing membrane.
High strength polyurethane waterproof coating is a two component reaction curing type waterproof coating. High-strength polyurethane waterproof coating Two-component chemical reaction curing type Isocyanate-terminated prepolymer obtained by polycondensation of polyether and isocyanic acid, component B is composed of a plasticizer, a curing agent, a thickener, a coagulant, a filler Composition of colored liquids. When used, the two components of A and B are mixed in a uniform manner, and they are painted on the surface of the waterproof base layer, and are often cross-linked and cured to form a rubber elastic film with high elasticity, high strength and durability, and thus play a role in waterproofing.
The water-borne polyurethane waterproof coating generally refers to a single component polyurethane waterproof coating, oil refers to the two-component polyurethane waterproof coating; compared to the water performance is almost, the price is cheaper, the most important thing to see the use of the environment! However, waterborne polyurethane waterproof coatings are more environmentally friendly. Each has its own good, just like fruits, with different effects and different requirements.
Waterborne polyurethane waterproof coating has the following characteristics:
1. One-component, cold construction, non-toxic and odorless, safe to use.
2, can be in the wet (no water) or dry base surface construction, tough tough coating.
3, for masonry, mortar, concrete, metal, foam board, insulation layer and so have a strong adhesion.
4. Construction is safe, simple and short in duration.
Third, polyurethane waterproof coating specification
1, construction method
Implemented in accordance with 5.1 Standards in Technical Specifications of Roof Engineering
(1) Grassroots treatment: The grass-roots level must be flat and firm, clean and clear water, and the yin and yang angle should be rounded. The old roof should be removed from the original cracked, drum-resistant waterproof layer and dust. Leakage prevention must be conducted first, the grassroots level should be flat, there must be no clear water. The special parts such as water fall-off, sub-lattice seam, etc. should be subjected to flexible sealing treatment firstly, and the brushing procedure is generally performed first in the yin-yang angle, then in the vertical plane, and finally in a large area.
(2) Primer construction: Mix water and paint in a 1:3 weight ratio and mix well before use. The use of a primer can increase the permeability of the coating to the substrate and enhance the adhesion.
(3) Paint coating: The method of rolling, scraping and brushing may be used for construction. It is recommended to adopt a thin layer multiple coating method. Each time the brushing cannot be too thick, it is generally divided into 3-4 brushings and the total thickness is 1.5. -2.0mm. After the coating is dried and filmed, the coating may be applied again. In the weak link, carcass reinforcements should be added.
(4) After each coating is dry, construction quality inspections shall be conducted. If leakage coating and drumming occur, repair shall be given.
2, matters needing attention
(1) Before the construction, the paint shall be fully mixed and uniform, and no water shall be added to the paint except the primer to ensure the quality.
(2) Carcass reinforcements are generally applied on the second coat.
(3) It is forbidden to work under 5°C or in freezing rain and snow. Before the film is dried, no other work may be performed on the coating to avoid damaging the protective layer and affecting the waterproof effect.
(4) In order to ensure the waterproof effect, it is recommended that the amount of paint per square meter is 2.5 kg or more.
3, the scope of application
(1) Roof: All kinds of old and new flat roofs and gutters, especially for water-proof and impermeable areas with irregular shapes.
(2) Ground construction: waterproof and moisture-proof finishes for toilets, kitchens, pools and external walls.
(3) Underground construction: internal and external walls, floors, underground tunnels, elevators, etc.
(4) Combined use with various waterproof membranes or waterproof coatings to improve the waterproof effect and durability.
(5) In combination with SBS waterproofing membranes, the waterproof effect can reach more than 25 years.
The relevant information on one-component polyurethane waterproof coating is introduced here for everyone. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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