water based polyurethane waterproof coating
Waterborne polyurethane coatings have excellent comprehensive properties, high fullness, film hardness as high as 1.5-2H, and wear resistance even exceeds that of oily paints, which has obvious advantages in service life and color matching. They are advanced products in water-based paints, and only a few professional companies in the world have mastered this technology. In China, only Dongguan Dingyuan Industrial Co., Ltd. took the lead in completing the localization of this core technology and has a national invention patent.
In addition, there is a waterborne wood paint with acrylic acid as the main component, which is characterized by good adhesion and will not deepen the color of wood, but poor wear resistance and chemical resistance, soft paint film hardness, poor fullness, general comprehensive performance and easy defects in construction. Because of its low cost and low technical content, it is the main product that most water-borne coatings enterprises push to the market. This is also the reason why most people think that water-based paint is not good. Its advantage is that it is cheap.
Scope of application of waterborne polyurethane waterproof coating
Suitable for national key projects and general waterproof projects, such as roofs, color steel tiles, basements, civil air defense projects, kitchen and bathroom rooms, culverts, tunnels, bridges, pools and other projects. It can also be used for corrosion protection of metal pipes, workshop floors, pools and other projects, and bonding of wood floors, cement boards, asbestos products, glass fiber reinforced plastic products, ceramic products, floor tiles and so on. , and can also be used as joint filling material for building structures.
Classification of Waterborne Polyurethane Waterproof Coatings
1. According to particle size and appearance, it can be divided into polyurethane aqueous solution (particle size 0. 1 micron, white and turbid appearance);
2. According to the charge properties of hydrophilic groups, waterborne polyurethane can be divided into anionic waterborne polyurethane, cationic waterborne polyurethane and nonionic waterborne polyurethane. Among them, anionic type is the most important, which can be divided into carboxylic acid type and sulfonic acid type.
3. Waterborne polyurethane can be divided into polyether type, polyester type and polyether-polyester mixed type according to different synthetic monomers. According to the difference of diisocyanate, waterborne polyurethane can be divided into aromatic and aliphatic, or TDI, HDI and so on.
4. Waterborne polyurethane can be divided into one-component waterborne polyurethane and two-component waterborne polyurethane according to the product packaging form.
5. The whole synthesis process of waterborne polyurethane can be divided into two stages. The first stage is pre-step polymerization, that is, aqueous polyurethane prepolymer with relative molecular weight of l000 is generated by solution step polymerization of oligomer diol, chain extender, aqueous monomer and diisocyanate; The second stage is the dispersion of the neutralized prepolymer in water.
The classification of waterborne polyurethane waterproof coatings is introduced. For more information, please pay attention to the information of this website.