Uv Cured Coating Compositions and Their Industrial Applications (Part 2)

Application of 2UVCC

Because UVCC has the advantages of fast curing speed and environmental friendliness, it has been rapidly developed in various industries. The substrate that it adapts has been expanded from the earliest wood to paper, plastic, metal, stone, cement, fabric, and leather.

2.1 paper coating

Paper glazing coating is a varnish, commonly known as light-curing varnish, and is suitable for coating and decoration of books and magazine covers, advertising posters, product packaging cartons, decorative paper bags, etc., giving products high gloss and wear resistance. Sex, water resistance, enhance the beauty of the product.

2.2 Wood Coatings

UVCC was originally used for the coating of wood, and now woodware UVCC is a relatively large class of light-cured products. According to the use occasions and quality requirements, wood UVCC can be divided into parquet flooring coatings and decorative sheet coatings, can also be divided into varnish and paint. In terms of construction, it includes UV putty paints, UV primers, and UV topcoats. Wood furniture for UVCC requires high gloss, wear resistance, scratch resistance, high hardness, and multi-color; UVCC for wood flooring requires matt, abrasion resistance, scratch resistance, impact resistance, and corrosion resistance.

2.3 Plastic Coatings

Generally include ordinary plastic coatings and engineering plastic coatings. Can give ordinary plastic such as polystyrene products, organic glass, polyester film products such as friction resistance, easy scratch resistance; give phenolic products, ABS products and other engineering plastics high hardness, high gloss, beautiful performance; For plastic flooring, UVCC can give it scratch resistance, wear resistance, low gloss, aesthetics and other properties.

2.4 Metallic Coatings

Widely used in metal sign decoration, cans processing, metal panel manufacturing, aluminum alloy doors and windows protection and temporary steel pipe coating protection. The product mainly plays a protective role, in addition to making it more elegant and beautiful.

2.5 Fiber Coatings

The research on optical fiber UV coatings has been started abroad in the 1970s. Domestic Hubei Chemical Research Institute and Xi'an Jiaotong University have made special studies in this regard. The main function of optical fiber UV coatings is to protect the strength of quartz glass drawn into fibers and prevent environmental pollution, and to give each fiber different colors to show the difference.

2.6 Other coatings

Depending on the material being coated, UVCC can also be used for the coating of glass, leather, ceramics, silicate stones, optical disks, etc. The application scope of UVCC is very broad, and people are constantly researching and developing new application areas.

3 Leather UVCC

UVCC was originally used for wood coating. With the continuous development and improvement of technology, its application scope has become more extensive. The application of UVCC in the study of leather finishing began abroad in the 1970s. However, in China, research in this area is still relatively rare. Compared to traditional leather finishing agents, the advantages of UVCC in leather finishing are:

(1) The curing speed is greatly improved, and the drying time is even less than 1 minute. The possibility that the wet film adheres to dust and causes the gloss to decrease is greatly reduced;

(2) The solvent volatilization is greatly reduced;

(3) Low curing temperature;

(4) Excellent glossiness and aesthetic appearance of the coating film;

(5) Avoid the use of cross-linking agents such as formaldehyde in leather finishing agents, play an environmental protection role, and accord with the development direction of eco-leathers;

(6) Can be used for leather finishing, but also can be used for artificial leather and synthetic leather finishing, equipment requirements are simple. The tanning process using Uv coating generally includes the following steps: leather (synthetic leather) - ironing a UVCC primer - a radiation curing - IIVa top coating - radiation curing.

With the continuous development of society, people’s awareness of environmental protection has also increased, and more emphasis has been placed on the development of environmentally friendly technologies and chemicals that are less polluting on the environment and harmless to the human body. UV curing technology is a new type of environmentally friendly technology, and it is believed that its application in leather finishing will become a major trend. Uv leather finishing agents will also become one of the research hotspots for leather finishing agents.

The status quo and development trend of UVCC at home and abroad as early as in the early 1970s, China began to study the UV curing coating. Shanghai and Beijing established several furniture production lines, but they were discontinued due to lack of raw materials, light sources, and solidification equipment. The real development should begin in the 1990s. In the past decade, the research and product variety in this field have achieved considerable development and the industrial scale has been formed.

In 1993, Radtech China was formally established in China. In Asia, it is second only to Japan that owns this association. There are now 200 member units. According to incomplete statistics, there are more than 200 UV-cured wood floor production lines and more than 400 printing lines in China. Now a batch of Uv-curing coating factories has emerged in the country, its quality has been continuously improved, its varieties have been continuously increased, its output has risen rapidly and its development prospects are good. Researchers from Beijing University, Tsinghua University, Beijing Normal University, Beijing University of Chemical Technology, China University of Science and Technology, East China University of Science and Technology, Shanghai University, Shaanxi University of Science and Technology, and Institute of Photographic Science, Chinese Academy of Sciences, and other scientific and technical personnel are engaged in the field of UV curing. Scientific research and technological development, and active technical cooperation with related companies to achieve integration of production and research, which not only promoted the popularization and improvement of UV curing technology, but also greatly accelerated the progress of industrialization.

In foreign countries, since the 1960s, Bayer AG has successfully used unsaturated polyester and styrene to develop light-cured wood coatings. For more than 30 years, UV curing technology has developed rapidly, and the output of UV-curable coatings has continued to increase. Increased, quality gradually increased, more widely used. In developed countries and regions such as North America, Europe and Japan, the development is particularly rapid, and the annual growth rate of UV-curable coatings is maintained at more than 10%. With the continuous development of UV curing technology and application needs, researchers have developed water-based UV-curable coatings and powder UV-curable coatings.

Future UVCC development trends and issues that should be noted: First, the development of multi-species UVCC, further development of water-based I and powder UVCC, with water instead of reactive diluents is one of the development trend of UVCC _7; second is the continuous expansion of U VCC application scope, such as UVOC's many advantages, has broad prospects in the application of leather finishing, but there are very few domestic reports in this regard; Third, strengthen the basic theoretical research of IIVCC, such as chemical properties, optical properties, curing kinetics Nature and so on. 5 Conclusion UVCC is a high-efficiency, energy-saving and environmentally friendly green coating suitable for various substrates. It has been widely used in various industries. With the in-depth study of UVCC, new products have been successfully developed, UVCC is expanding into various areas of traditional coating applications, and its application in leather finishing will also be more extensive and mature. Although China's UVCC industry has achieved certain development in recent years, compared with foreign developed countries, there is still a big gap in terms of variety, quality, market size, and research and development. It is necessary to strengthen the work in this area.

Source: China Leather Chemicals Network