Zero formaldehyde and antifouling of wall coating

2022-07-22
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Many coatings on the market now boast zero formaldehyde. But in fact, the paint must have a certain degree of adhesion and film-forming ability to be stably coated on the surface of the object, which is one of its most basic and important properties: to prepare the required color, it must be able to fully mix the pigment with the solvent and make it evenly distributed

therefore, in order to meet these basic requirements, coatings must contain four basic components: film-forming substances, pigments, solvents and additives. Among them, the film-forming materials basically use synthetic resin materials, such as acrylic acid, epoxy resin, etc., while the preservatives and anti mildew agents in some low-end coating additives may involve harmful components such as formaldehyde, so these two parts are also the main source of formaldehyde in the coating

although at present, many new coatings use alternative ingredients to reduce the content of formaldehyde, and have been able to achieve zero formaldehyde environmental protection coatings in the laboratory environment, once commercial production is carried out, coupled with the impact of factors such as cost control, overall performance and effect, subtle differences will appear. At present, many new coatings use alternative ingredients to reduce the content of formaldehyde, which can be controlled below the detection content, that is, no formaldehyde is detected. (the national standard stipulates that the formaldehyde content in the paint shall not exceed 50mg/kg)

although the formaldehyde content and formaldehyde emission of these environmental friendly coatings are far from enough to cause harm to human body (the national standard stipulates that the formaldehyde content in indoor air cannot exceed 0.1mg/m3, and when the indoor formaldehyde concentration reaches 0.5mg/m3, the human body will have the symptoms of tears and abnormal eye sensitivity), the source of formaldehyde in our home is not only paint, but also various furniture, building and decoration materials

the release of formaldehyde is a slow and continuous process: theoretically, the formaldehyde release of various furniture and building materials will reach a peak within 3-6 months after opening the package, and then the release will gradually decrease, and the release speed will slow down, but in fact, there are certain fluctuations due to the influence of temperature and other environmental factors. Among them, the biggest impact on us is the release of free formaldehyde &mdash& mdash; It usually volatilizes in about 2 months. After that, as long as the formaldehyde content in the air is lower than the lower limit of the national standard, we can stay at ease

therefore, many brands have also developed many new coatings. Recently, it has been found that some coatings will add anti formaldehyde active substances. When the unsaturated functional groups of these active substances are in contact with the adsorbed formaldehyde, they can react with formaldehyde molecules to produce water, and the C atom in formaldehyde will be directly added to the active functional groups of unsaturated bonds, thus realizing the function of decomposition and purification of formaldehyde

at present, most of the environmental protection coatings on the market have certain adsorption function, and the coatings with formaldehyde decomposition function are mostly used for children's paint. However, it should be reminded that even if it has the function of chemical decomposition of formaldehyde, it can only be regarded as an auxiliary measure, not the fundamental solution to deal with formaldehyde

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