Generally speaking, water-based paints technology has gone through the following three stages:
The first generation of water-based paints is mainly made of acrylic acid, which has the advantages of good water resistance and weather resistance, and is the main product that water-based paints manufacturers put on the market. Its disadvantages are general comprehensive properties, low chemical properties (such as poor alcohol resistance and alkali resistance), low physical indexes such as hardness and wear resistance, which is also the reason why most people think that water-based paints are not good.
The second-generation water-based paints takes the compound of acrylic acid and waterborne polyurethane as the main raw material, which not only inherits the advantages of the first-generation acrylic acid product in weather resistance and construction flexibility, but also improves the hardness of water-based paints, but its chemical properties are still relatively low. At present, only a few domestic enterprises can produce it, and it is a mid-range product in water-based paints.
The third-generation water-based paints uses acrylic modified waterborne polyurethane as the main raw material. On the basis of the second-generation water-based paints products, the comprehensive properties of the products are greatly improved, and the hardness measured by pencil rule can reach more than 2H, which fully meets the needs of daily production. The wear resistance even exceeds that of oily paint, and it has obvious advantages in service life and color blending; More importantly, the chemical properties are stable, and the alcohol resistance and alkali resistance are greatly enhanced compared with the former two. It is a high-grade product in water-based paints, and this technology is monopolized by a few manufacturers at home and abroad.
Although water-based paints has the advantages of good environmental protection paint film effect, there is still a certain gap between one-component water-based paints and two-component oily paint in hardness and high temperature resistance. For example, it is very easy to show its lack of performance when used on dining tables and floors. This functional defect led to the development of water-based paints.
Until 28, Asahi Coatings, the first Japanese brand of household coatings, launched the world's first truly two-component water-based paints, which not only has the advantages of environmental protection and non-hazardous goods of ordinary water-based paints. Due to the use of environmentally friendly curing agent, the performance of its paint film can exceed that of ordinary two-component oily paint in the market in terms of hardness, high temperature resistance and clarity. The listing of this product means that the era of replacing ordinary paint in water-based paints has really begun, because water-based paints has reached and surpassed the performance of paint in various performances, and consumers will definitely stop choosing paint to decorate their houses gradually, because the toxicity of paint is very great and lasting to human body. However, the technology of this two-component water-based paints is only mastered by a few paint manufacturers in the world, such as Asahi, and the price is very expensive. Which restricts its popularization and development.
Fake two-component water-based paints in the market, just like Apple's mobile phone, fake products often emerge one after another. Before Asahi introduced the two-component water-based paints, some small paint factories in the market began to introduce the so-called two-component water-based paints, which is actually an improved product of paint. Although its hardness has been improved a lot, it contains a lot of toxic substances like ordinary paint, which violates water-based paints's original intention of protecting the environment and human health with environmental protection and non-toxicity.
Identification of the authenticity of two-component water-based paints: 1. The real two-component water-based paints, whether it is the main agent or the curing agent, basically has no smell or only a very slight smell after opening the can. 2. The real two-component water-based paints is diluted with clean tap water. If special thinner or alcohol substances are needed to dilute it, it must not be. 3. The two-component water-based paints is also a non-hazardous chemical, while the fake two-component is often flammable and dangerous. 4. Look at the environmental protection index: does it contain benzene heavy metals and high-content VOC and other toxic substances?
Performance introduction: It is a water-based varnish that can withstand the high temperature of 1℃ and reach the hardness of 3H, and can be painted in general.
◆ performance? Features:
Excellent coating performance, almost the same as solvent-based polyurethane coating, heat resistance? Solvent resistance? Resistant to drug corrosion? The wear resistance is very good, and the tough coating effect can be maintained for a long time. A teapot filled with boiling water can be placed on the desktop (that is, it can resist the temperature of 1℃, and it can also exert its strong scratch resistance when coated on the floor and other places. It is an environmentally-friendly and safe waterborne two-component varnish for DIY consumers. It is a very environmentally-friendly waterborne varnish without the pungent smell of solvent varnish. It is also non-flammable, and it is also a very safe product without danger in fire protection. Does not contain toxic substances designated by the Japanese Ministry of Health, Labor and Welfare. (Xylene is not used in production? Benzene? 14 designated harmful substances such as formaldehyde)
◆ Yellowing performance.
◆ It is a colorless polyurethane varnish, and it will not appear yellow when painted on a white surface.
◆ Performance test comparison table of two-component polyurethane varnish. Tested coatings Asahi coatings General brands in the market Remarks of general brands in the market Test items Waterborne two-component polyurethane oily one-component polyurethane oily two-component polyurethane transparency completely transparent transparent hardener hazardous substances distinguish non-hazardous substances-hazardous substances of the first type of petroleum solvent main agent distinguish non-hazardous substances second type of petroleum solvent first type of petroleum solvent diluent. Yellowing property of special solvent for water-based diluent ○×○ Non-stickiness ○ △ ○ 1℃, Appearance smoothness of graphite coating film ○○○○○○○○○○○○○○○○○○○○○○○○○○○○96 ○> △> ▲> × inferior 1. product description:
category: ultra-durable waterborne two-component polyurethane varnish
ingredients: main agent: waterborne polyurethane synthetic resin, water
hardener: waterborne polyurethane synthetic resin, auxiliary agent.
drying time: surface drying at room temperature: 3 minutes to 1 hour (standard brushing amount: 8-1g/m2)
standard brushing times: 2 times
standard brushing area: wood surface with strong water absorption: 2.5-3.2m2 (6g)
wood surface with weak water absorption: 3.7.
2. Product features:
◎ High environmental protection varnish. Belonging to water-based varnish. High environmental protection, low odor, no danger during operation, and no strong irritating odor.
◎ Does the coating film have good heat resistance? Wear resistance? Corrosion resistance of drugs. It has almost the same coating performance as solvent-based polyurethane varnish, and can maintain a tough coating effect for a long time.
◎ Strong heat resistance can be applied to a teapot filled with boiling water on a desktop (that is, it can resist the temperature of 1℃), and at the same time, it can also exert its strong scratch resistance when applied to floors and other places.
◎ It is a polyurethane varnish that will not turn yellow when exposed to ultraviolet rays and visible light, and will not turn yellow when painted on a white surface.
◎ It has anti-slip function and is also suitable for painting stairs and corridors.
water-based paints's application tips
With water-based paints's increasing exposure to people's lives, I think everyone will not be unfamiliar with water-based paints. Here are some tips for using water-based paints. I hope I can bring you help.
1. Types and application technologies of waterborne wood coatings
Based on the analysis of waterborne wood coatings sold in the market, the application technologies of waterborne wood coatings can be roughly divided into the following categories according to the types of base materials:
① Acrylate type: among them, styrene-acrylic emulsion and acrylate (modified) emulsion are suitable for primer and matte topcoat. The coating made of this base material is relatively low in cost and average in hardness, and it is not easy to produce shrinkage cavity, but it is not suitable for high-gloss paint because of its poor film-forming performance and poor gloss. Poor wear resistance, difficult defoaming, generally mixed use; ② Polyurethane dispersions: including aromatic and aliphatic polyurethane dispersions, the latter has excellent yellowing resistance and is more suitable for outdoor use. They all have good film-forming properties, high self-crosslinking luster, good wear resistance and are not easy to produce bubbles and shrinkage cavities. But the hardness is average and the price is expensive, so it is suitable for making bright topcoat and floor paint. (3) Polyurethane dispersion modified by acrylic acid: it includes a mixture of aromatic and aliphatic polyurethane and acrylate dispersion, which has the advantages of the above two types, has moderate cost, can be self-crosslinked, can also be used in two-component systems, has good hardness, fast drying, wear resistance, good chemical resistance, low yellowing degree or no yellowing, and is suitable for bright matt paint, primer, outdoor paint, etc.
④ Waterborne urethane oil: it is a single component, similar to oily urethane oil, and it is redox-drying. When forming a film, it needs to be added with a drier, which is fast in drying, good in luster, hardness, wear resistance and water resistance, and is suitable for making glossy finish and floor paint. ⑤ Waterborne two-component polyurethane: one component is polyurethane dispersion with -OH; The two components are water-based curing agents, mainly aliphatic. The water resistance, hardness and fullness of the two components can be significantly improved by cross-linking reaction, and the gloss has a certain effect. The comprehensive performance is good, and the paint is not easy to yellow, so it is especially suitable for outdoor painting.
2. Present situation of product technology
From the packaging point of view, waterborne wood coatings on the market can be divided into single component and two components, of which single component accounts for the vast majority; From the source of goods, there are original imported products, products produced by foreign brands in China, and products developed and produced by domestic manufacturers. Among them, the former two are mostly, and the latter has a small sales share. Through some analysis and testing of foreign brands, joint venture brands and domestic products, the performance of their products is summarized as follows.
① product appearance: milky white, yellowish and reddish sticky;
② solid content: generally 3% ~ 45%, which is much lower than that of solvent;
③ water resistance: aliphatic polyurethane dispersion and waterborne urethane oil are much better than aromatic/acrylic emulsion type;
④ alcohol tolerance: the trend is basically the same as water resistance;
⑤ hardness: the acrylic emulsion type is the lowest, followed by aromatic polyurethane, and the aliphatic polyurethane dispersion and its two-component polyurethane and urethane oil are the highest, and its hardness will gradually increase with time, especially the two-component crosslinking type. However, the hardness increases slowly and is low, which is far less than that of solvent. Hardness of pencil can reach H very few;
⑥ gloss: it is difficult to reach the gloss of solvent-based wood coatings with bright light, which is generally about 2% lower. Among them, the two-component is higher, followed by urethane oil and polyurethane dispersion, and the acrylic emulsion type is the lowest;
⑦ plumpness: due to the influence of solid content, there is a big difference, and the solid content is low and the plumpness is poor. The higher the solid content, the better the plumpness, the two-component crosslinking type is better than the single component, and the acrylic emulsion type is poor;
⑧ Wear resistance: the cross-linking type of urethane oil and two components is the best, followed by polyurethane dispersion and acrylic emulsion;
3. Application Technology of Waterborne Polyurethane Paint
Waterborne Polyurethane Paint, as a new type of environmental protection product, has only entered the China market in recent years. Its greatest advantage lies in solving the problem that domestic consumers pay more attention to the fullness, handle and hardness of paint film, and its heat resistance, scalding resistance, alcohol resistance, water resistance and pollution resistance.
broke through the weakness of waterborne wood paint; Moreover, waterborne polyurethane paint is not easy to generate bubbles during construction, easy to polish, and not easy to be affected by temperature and humidity, which lays a solid foundation for comprehensively solving the market application of waterborne wood paint. There are still some pseudo-water-based paints in the market. When using it, it needs "special dilution water" and so on, which is very harmful to human body.