Performance characteristics of polyurethane coatings

Polyurethane coatings have a series of advantages: (1) The film has extremely high wear resistance, which is outstanding among various types of coatings, and is therefore widely used as floor paint, deck paint, yarn tube paint, etc. (2) Some varieties of coatings (such as epoxy and chlorinated rubber) have good protective functions but poor decorative properties; some varieties (such as nitrocellulose paint) have good decorative properties but poor protective properties. Polyurethane coatings not only have excellent protective properties, but also have beautiful decorative properties. Therefore, high-grade wood products, pianos, large passenger aircraft, etc., mostly use polyurethane coatings. (3) The coating has strong adhesion and can be formulated into excellent adhesives like epoxy resins, so the coating adheres to various surfaces (wood

2022-04-28

Brief introduction to the synthesis of epoxy resin modified waterborne polyurethane

Waterborne polyurethane is a type of polymer material with excellent physical properties, mechanical properties, weather resistance, environmental friendliness, and other advantages. With the development of society and the progress of the times, it has been gradually applied in various fields such as coatings, home decoration, and inks. However, due to limitations in its synthesis methods, the performance of waterborne polyurethane is still inferior to that of oil-based polyurethane in certain aspects. In order to improve the comprehensive performance of waterborne polyurethane, more and more researchers are engaged in the modification of waterborne polyurethane resins. Currently, the main modification methods include: 1. Improving monomers and synthesis processes; 2. Adding auxiliaries; 3. Crosslinking; 4. Composites. Waterborne polyurethane

2018-09-11

Analysis of common problems in the dry coating process of waterborne polyurethane synthetic leather manufacturing

Surface pinholes. The causes of surface pinholes include: excessively high surface viscosity, excessively thick coating, excessively high temperature in the first oven, short surface drying time, excessive bubbles in the prepared material, and air entering the coating tank. The situation of the slurry during drying is shown in the figure below. Because the release paper thickness is much greater than the slurry, this structure is formed before the heat arrives. Analysis of common problems in dry coating in the manufacture of water-based polyurethane synthetic leather. When the surface viscosity is too high, the water vapor generated during drying is difficult to escape from the coating, resulting in small air pockets and pinholes. Reduce the surface mixture

2018-09-11

What are the differences between waterborne acrylic resin and waterborne polyurethane resin?

Water-based acrylic resins: including acrylic resin emulsions, acrylic resin water dispersions (also known as water-dilutable acrylics), and acrylic resin aqueous solutions. Emulsions are mainly synthesized by emulsifying olefinic monomers in water and initiating them with water-based free radical initiators, while resin water dispersions are synthesized through different processes such as free radical solution polymerization or step-growth solution polymerization. Acrylic emulsions are mainly used as the base material for emulsion paints and occupy an important application in the architectural coatings market, and their applications are continuously expanding; in recent years, the development and application of acrylic resin water dispersions have attracted increasing attention, and are used in industrial and civil coatings.

2018-09-11

Water-based polyurethane applied to wallpaper composite

Waterborne polyurethane, also known as WPU, is increasingly used in people's daily lives, such as: dyeing and printing of various textile materials; coating of slow-release fertilizers and seeds; interior and exterior wall latex paints for houses, furniture paints for solid wood furniture, genuine leather and synthetic leather on sofas; interior adhesives and car paints for buses, high-speed trains, and private cars, etc. Wallpaper is widely used in interior decoration of residential houses, offices, hotels, etc., because it has many incomparable advantages over other interior decoration materials, such as diverse colors, rich patterns, luxurious style, safety and environmental protection, convenient construction, and reasonable price. Therefore, it is widely used in developed countries.

2018-09-11

Comparison of water-based and oil-based paints

Water-based paint is a coating that uses water as a diluent and does not contain organic solvents. It is free of benzene, toluene, xylene, formaldehyde, free TDI, toxic heavy metals, and has no toxic or irritating odor. It is harmless to the human body, does not pollute the environment, and the paint film is full, crystal clear, flexible, and has the characteristics of water resistance, abrasion resistance, aging resistance, yellowing resistance, fast drying, and easy use. It can be used on a variety of materials such as wood, metal, plastic, glass, and building surfaces. Oil-based paint, on the other hand, refers to a coating made with organic solvents. It contains volatile organic compounds (VOCs), which are not only toxic to humans and pollute the environment, but are also flammable and explosive; some varieties also

2018-09-06

Advantages of water-based paint

1. As we all know, water-based paints use water as a solvent, saving many resources. At the same time, it reduces the occurrence of fires during construction and reduces environmental pollution. Because it only uses a small amount of low-toxicity alcohol ether organic solvents, it effectively improves environmental conditions. 2. It is understood that water-based paints can be directly applied in both dry and wet environments. Water-based paints have strong applicability to walls, and the coating adhesion is also very good. 3. The painting tools of water-based paints can be directly washed with water, which effectively reduces the amount of cleaning solvent and avoids damage to the construction workers.

2018-09-06

Unveiling the Knowledge of Water-Based Paints: How Much Do You Know?

1. What thinner is used for water-based paint? Answer: Water is the thinner for water-based paint. When choosing water to thin water-based paint, it only needs to meet the national drinking water standards. For two-component water-based paints, it is recommended to add the curing agent first, mix it evenly, and then add water to dilute and mix. 2. What should be noted when diluting water-based paint? Answer: When diluting water-based paint with water, the first thing to note is the pH value of the water, to prevent the addition of acidic water, which will affect the stability of the paint liquid in the future, causing the pigments in the paint to easily settle or be difficult to stir. PH value adjustment principle: adopt a small amount of multiple dilutions

2018-09-06