Sports ground has its own particularities. First of all, as an interface that is directly in contact with athletes, when athletes make emergency stop, run, jump and other actions, without prejudice to their actions, they need to ensure their safety to the greatest degree; As a professional venue, sports grounds must be able to provide good sports performance. To ensure these two points, it is necessary to apply a sports floor coating.
In addition, as an increasingly commercial sports industry, sports venues with good viewing effects are a must, and sports floor coatings can provide more functions in this area. Its bright luster and rich background enhance the live broadcasting and viewing effect. Sports floor coatings are increasingly attracting attention from the sports building materials industry.
I. Overview of Sports Ground Coating Development
Most sports flooring is wood flooring, so many sports ground coating products are developed for sports wood flooring. As a traditional decorative care method for sports wood flooring, paint is applied on the surface of the wood. The high volatile solvent content of the paint makes it far from meeting the requirements of people and the environment. In this case, waterborne acrylic emulsion paints and waterborne polyurethane paints were successively developed. Acrylic emulsion paint is non-toxic and harmless. Water is used as a solvent to improve the environment.
Such copolymers have good thermal stability, photochemical stability and oxidation resistance. As a film-forming material for wood floors, it has good properties such as gloss, film forming properties, and adhesion. However, acrylic (emulsion) emulsions are relatively poor in scratch resistance, such as low-temperature brittleness, high-temperature stickiness, and the like. In particular, as a sports floor wood floor, the requirements for wear resistance and scratch resistance of the coating are very high.
Ordinary acrylic emulsions are not suitable for the above applications. In addition to the advantages of acrylic emulsion, polyurethane emulsion coating also has the advantages of good abrasion resistance, but its price is very expensive. It is a dozen or even more than 20 times of the general paints, and it is stain-resistant and anti-black offset printing. Poor performance. In the current market, there are mainly three types of products with good performance, namely silicone-modified acrylate emulsions, polyurethane-acrylic emulsions, and heavy-duty two-component emulsions.
1. Silicone modified acrylate emulsion
Organosilicon compounds have low surface free energy, and when copolymerized with acrylic acid to form a silicone resin, the coating can form a stable siloxane film, so the film has good hydrophobicity, stain resistance and resistance Grinding. In addition, as one of the important properties of the sports coating, slip resistance plays a very important role in sports safety. Large and small static friction coefficients may cause sports injuries to athletes.
The author aimed at these points and synthesized a silicone-modified acrylate emulsion as a core material for a sports wood floor care coating to improve the water resistance, solvent resistance, abrasion resistance, scratch resistance, and weatherability of the coating. The use of nano-particles to modify the surface microstructure of the modified coating effectively controls the anti-slip performance of the coating and is gradually becoming a brand name for the sports floor coating market.
2. Polyurethane and acrylic emulsions and heavy-duty two-component emulsions
The combination of polyurethane and acrylic emulsions combines the advantages of polyurethanes and acrylics, and uses compounding techniques and scientific formulas to avoid weaknesses, especially in terms of coating wear resistance, but lacks in water resistance and stain resistance. Heavy-duty two-component emulsions are mainly used in heavy-duty applications and sites subject to intense sports. They have excellent abrasion resistance. The emulsion contains modified polyurethane. The product is added with the second curing component to reduce the film formation time.
Second, the research progress of synthetic coating technology for sports flooring
Silicone-modified acrylate emulsion synthesis technology is currently the focus of research. The silicone-modified acrylate emulsion was prepared by a seed emulsion polymerization method and was graft-copolymerized with a reactive silicone monomer and an acrylate emulsion to obtain a silicon-modified acrylate composite emulsion having a core-shell structure. The polymer particles of the composite emulsion contain Si-OH active groups. When the film is cured, the Si-OH active groups on the polymer chains condense and crosslink with each other to form Si-O-Si bonds under the action of the catalyst. .
At the same time, the Si-OH active group on the polymer chain also dehydration cross-links with the hydroxyl group on the substrate surface (such as -OH hydroxyl group on the wooden floor cellulose) to form an intermolecularly stable siloxane film. Therefore, the wear resistance, hardness, adhesion and other properties of the cured coating can be significantly improved. The Si-O covalent bond has a relatively large bond energy of about 432 kJ/mol, and has good heat resistance, light stability, and good weather resistance. In addition, the network-like siloxane structure has a low surface free energy and good hydrophobicity, so that the cured coating performs better in terms of water resistance, stain resistance, and scrub resistance.
According to the author's research results, the particle size is an important parameter of the polymer emulsion, and it has a great influence on the application of the core-shell polymer emulsion. The nanoparticle size ensures good fusion between the polymer microspheres during film formation. When such a polymer emulsion is used as a coating film, it has excellent film forming properties, leveling properties, and good gloss. The particle size analysis and transmission electron microscopy photographs of silicones distributed in the shells are shown in Fig. 2. The results showed that the average particle size of the polymer emulsion was 99.5 nm, and the polymer particles exhibited special dentate spheres.
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