Coating knowledge: selection and application of decoration coating

Core tip: there are reports of poisoning and even death of householders and workers in building decoration Toxic materials are sometimes referred to as coatings, and sometimes specifically as latex or wall coatings In fact, coating is a general term, including thousands of different varieties As far as the interior decoration of families is concerned, there are coatings for painting walls At present, there are commonly used latex paints of different grades, putty matching with them, sealer and many cheap water-based coatings still used by consumers, such as the so-called 107 coating; coatings for painting doors, windows, pipes and various wood ornaments, etc Before commonly used alkyd enamel and alkyd Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Paint Home News: there are reports of poisoning and even death of householders and workers in building decoration Toxic materials are sometimes referred to as coatings, and sometimes specifically as latex or wall coatings In fact, coating is a general term, including thousands of different varieties As far as the interior decoration of the family is concerned, there are coatings for painting the wall At present, there are different grades of latex paint, matching putty, sealer and many cheap water-based coatings still used by consumers, namely the so-called 107 coating; painting doors and windows At present, alkyd enamel, alkyd ready mixed paint and primer are commonly used for pipeline and various wood ornaments Brush the wood paint of fixed furniture floor and wall panel made by decoration company on site Here, we will introduce them respectively Wood paint: toxic but good protection In the current situation, there is a kind of wood paint with more serious toxicity There are many kinds of wood paint, but polyurethane wood paint is the most popular Polyurethane wood paint contains different amount of methylbenzene diisocyanate which is in free state It is a kind of harmful substance It has tear inducing effect and can also make skin slightly pigmented The most important thing is that the steam of this substance will have a strong stimulation on the respiratory tract Even under low concentration of steam, 2% - 5% of people will have an allergic reaction similar to anaphylactic asthma Therefore, strong ventilation is required in the environment involving such substances The isocyanate with strong volatility can volatilize quickly under the ventilation condition, and its toxicity can be eliminated There are many kinds of polyurethane wood coatings in the domestic market, and the content of free isocyanate is different But the cheapest and most used one is the so-called one component polyurethane wood paint The free toluene diisocyanate content of such wood paint is about 5% If the ventilation condition is worse, the toluene diisocyanate vapor will be difficult to escape It should be pointed out that a good polyurethane wood paint has its advantages: for example, the paint film is highly wear-resistant, which is most suitable for use as floor paint Therefore, it is better not to use this kind of wood paint in family decoration If you have to use it, you should first choose high-quality products (the price is certainly much more expensive); second, you should leave it vacant for one month after decoration, and then you can move in after ventilation There are many kinds of wood paint that can be applied to custom-made furniture and wallboard in the family, such as phenolic varnish, alkyd varnish, nitrocellulose varnish, etc Although they are also solvent based paint, they also have the problem of solvent toxicity Ventilation is also required during construction, and residence is also required to be postponed, but compared with polyurethane wood paint, its toxicity is relatively much smaller In fact, the furniture and siding made in the decoration do not have as high requirements for the water resistance of the paint film as the desktop The low toxicity varieties listed in the use are not only suitable, but also have great advantages in the selection of wood color (especially light color)! In foreign countries, latex paint (varnish, of course) has also been widely used as wood paint If we can in the home decoration, also as non desktop paint to be promoted, even the toxicity of solvents can be avoided Door and window paint: the door and window paint with low toxicity is often alcohol ester enamel and alcohol acid mixed paint These paints are solvent paint, and there is a problem of ventilation in use There are some cases of poor ventilation, early occupancy after brushing, bad smell and even headache of the householder However, if the solvent used is petroleum solvent oil and xylene with very low toxicity, it will not cause serious problems However, in recent years, fake and inferior products have flooded the market Counterfeiters use polyester waste instead of alkyd resin Counterfeiters use strong solvents and banned pure benzene for many years The problem caused by this kind of fake paint is not that it's so light as smelly and headache Emulsion paint: the basic non-toxic environmental protection products at present, in the interior wall decoration, emulsion paint is one of the most used decorative materials Considering many advantages of latex paint, it should be said that it is a good trend However, in some recent events related to the toxicity of paint, the toxicity of other paint "Zhang Guanli Dai" has been put on the head of latex paint Therefore, it is necessary to "return latex paint to clean" Emulsion paint, first of all, they (please note that emulsion paint is also a general term for a large category of varieties) are water-based coatings Their film properties are much better than solvent based coatings, and the organic solvent which accounts for half of solvent based coatings is replaced by water here Therefore, the toxicity of organic solvent is basically solved by emulsion paint At present, about 20 million tons of coatings are produced in the world in one year, and latex paint accounts for about half of them, almost 100% of them are used as decorative coatings This means that human beings can reduce the use of up to 5 million tons of precious resources every year in the decoration, so that they will not fly into the air, pollute the environment and endanger health At present, China's latex paint production will reach 2.4 million tons per year, which can save millions of tons of organic solvents This will undoubtedly protect our environment from pollution and people's health Latex paint is made of some polymer water emulsion as film forming material In the composition of polymer emulsion, besides water and harmless different types of polymers or copolymers, they also contain small amount of emulsifier and trace free monomer Emulsifier is the same substance as the main component of washing powder, which is non-toxic The so-called monomers include all kinds of acrylate, styrene and vinyl acetate, which are small volatile molecules with different degrees of toxicity What is the free monomer concentration of the emulsion produced by eight major emulsion manufacturers in China (80% or more of the emulsion Market in China)? It is understood that the control level of mixed free monomers is less than 0.1% Using such emulsion to produce latex paint, the free monomer content of latex paint is lower, and is far from within the safety limit Even if the free monomer content of the emulsion exceeds this standard, there will be no serious problems as long as it is within reasonable limits In fact, the dosage of these additives is more than 2% - 3% (film-forming agent), and less (mildew inhibitor) only accounts for 0.05-0.1% So even if these substances have certain toxicity, the harm is very slight Therefore, latex paint should be said to be basically non-toxic, and should be a green product If you add the attention to ventilation, and then dry properly, it is very safe to use latex paint for interior decoration Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,