Formulation introduction and product classification description of waterborne polyurethane waterproof coating

The effect of waterproof engineering depends on many factors, such as the choice of waterproof materials in the early stage and the research of construction technology in the later stage. The waterborne polyurethane waterproof solvent introduced to you today has a wide range of uses. They are safe, reliable and pollution-free, and they are a new type of green building materials. In addition, its excellent mechanical properties and good compatibility make it stand out in the highly competitive market. However, considering the actual situation in the later period, when we use it, we should refer to the formula of waterborne polyurethane waterproof coating mentioned below, select and prepare the corresponding suitable materials, and achieve satisfactory results through coordination.

I. Formulation of Waterborne Polyurethane Waterproof Coatings

100 kg emulsion, 300 kg water, 0.5 kg defoamer, 1 kg preservative. The disperser was stirred uniformly at a speed of 300 rpm for 20 minutes. Powder composition: 50 kg of No.425 cement, 30 kg of 200 mesh quartz stone and 20 kg of 80 mesh quartz stone. The dry powder mixer is stirred for 30 minutes. Proportion: liquid: powder = 1:2.77. Construction can be carried out by stirring evenly, not too thick or too thin. If it is too thick or too thin, the emulsion manufacturer, the ratio of cement to quartzite and the mesh number of quartzite can be adjusted.

Waterborne polyurethane coatings have excellent comprehensive properties, high fullness and film hardness as high as? 1.5-2H？ Wear resistance even exceeds that of oily paint, and it has obvious advantages in service life and color matching. It is an advanced product in water-based paint. Only a few professional companies in the world have mastered 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.

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.

Waterborne polyurethane waterproof coating, as a basic waterproof coating, has many formulas and product classifications. Therefore, according to the actual situation, we should start with the information we can bring with us and the information about demand and budget. For example, from the above, we can know that there are many materials that waterborne polyurethane can cooperate with, and the different dosage also determines the waterproof effect in the later stage. For friends who are preparing for the first time, the best way is to try combining the above formulas.

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