On February 1, the National Development and Reform Commission released the No. 11 Announcement of 2008, approving 12 industrial standards related to waterproof materials, including the “Restriction of Harmful Substances in Building Waterproof Coatingsâ€, to be implemented on July 1, 2008. Recently, the China Construction Waterproof Material Industry Association issued a notice that the waterproofing industry will implement the limited certification of toxic and hazardous substances in waterproof coatings. From March 1st onwards, the quality supervision department will carry out centralized rectification of 10 kinds of products such as paints nationwide. This series of actions are sending out a signal that the waterproof coating known as the "invisible killer" of home-made pollution will be subject to heavy punching. What is the status of Nanjing waterproof coating market? The reporter conducted an investigation for this purpose.
Inferior coating used to make waste
In major decoration materials stores in Nanjing, waterproof paint shops are generally "hidden" in the paint sales area. Because of its "unprecedented appearance", it is generally used as a supplier of B materials, that is, it is purchased and used by decoration companies. It is less likely to attract consumers' attention. Perhaps it is for this reason that reporters did not encounter many home improvement owners when they visited. On the contrary, the decoration company's project managers and even designers are rather endless.
According to a project manager who has been working for more than 10 years, the current phenomenon of counterfeit and fake water-repellent coatings in the Nanjing market is relatively common. For example, tar-based polyurethane waterproof materials that are banned by the construction department from being sold, as well as inferior waterproof coatings made from waste plastic bags, waste car tires, etc., can be purchased in some non-standard decorative material markets and even in small building materials stores. This kind of waterproof paint is very cheap, generally about 10 yuan per kilogram.
There are also some poor quality waterproof paints. For example, some dealers and even construction teams will add talc, fly ash, etc. to the waterproof coating to increase its thickness, or use waste rubber powder to add mortar.
Pollution is incurable due to "invisibility"
In addition to poor waterproof performance, poor quality waterproof coatings are a problem that cannot be ignored. Nanjing Haitai Nano Indoor Pollution Control Engineer Zhou Haiyan told reporters that the more serious pollution in the waterproof coating is some tar-containing polyurethane products. Such paints are generally made from coal tar or raw materials containing some coal tar. Volatilized tar oil has a pungent odor.
Due to the large molecular weight of tar oil, it is easy to deposit in indoor environments where air does not circulate. Excessive inhalation in a short period of time can cause rapid poisoning and death. And this type of waterproof coating using organic solvent as a diluent, the ingredients are mostly toluene, xylene and other toxic substances, long-term low-dose inhalation of tar oil and benzene, can cause respiratory diseases and dizziness, nausea, and even severe cancer.
“Using water-repellent coatings containing contaminated materials will cause indoor environmental pollution for a long time and it will not be easy to remove. Even if you want to comprehensively treat pollution, it is basically impossible. Because the pollution caused by the waterproof coating is hidden under the tiles.â€
Buy waterproof coating with reference standards
The reporter also learned that at present, the genuine waterproof paints sold in supermarkets in Nanjing are packed in 2.5 kg to 20 kg, with prices ranging from 40 to 50 yuan, including oil paints, water-based paints, and polymer waterproof materials. And other categories.
Industry experts remind consumers that they should purchase waterproof coatings from large-scale and regular decorative materials stores, and choose water-based coatings, waterproof coatings, waterproof mortars, or polymer cement-based waterproof coatings. For example, the polymer cement-based waterproof coating is a synthetic emulsion composed of various aqueous polymers. It is composed of high-quality cement mixed with additives. The flexibility of the polymer (resin) is integrated with the rigidity of the cement to make it have good impermeability. And stability, and convenient construction and low cost.
In addition, the contents of the "Limitations of Harmful Substances in Building Waterproof Coatings" can be used as a reference in the current purchase. For example, the standard classifies waterproof coatings into A and B grades, of which A grades are environmental protection type waterproof coatings; according to the nature of waterproof coatings, they are divided into three types: waterborne, reactive, and solvent-based, among which the limits of harmful substances in water-based waterproof coatings are stricter than "Indoor interior decoration materials interior wall paint harmful substances" provisions of the index. It can be seen that if home improvement is to pursue environmental protection, A-grade waterproof coating or water-based waterproof coating should be the first choice.
Inferior coating used to make waste
In major decoration materials stores in Nanjing, waterproof paint shops are generally "hidden" in the paint sales area. Because of its "unprecedented appearance", it is generally used as a supplier of B materials, that is, it is purchased and used by decoration companies. It is less likely to attract consumers' attention. Perhaps it is for this reason that reporters did not encounter many home improvement owners when they visited. On the contrary, the decoration company's project managers and even designers are rather endless.
According to a project manager who has been working for more than 10 years, the current phenomenon of counterfeit and fake water-repellent coatings in the Nanjing market is relatively common. For example, tar-based polyurethane waterproof materials that are banned by the construction department from being sold, as well as inferior waterproof coatings made from waste plastic bags, waste car tires, etc., can be purchased in some non-standard decorative material markets and even in small building materials stores. This kind of waterproof paint is very cheap, generally about 10 yuan per kilogram.
There are also some poor quality waterproof paints. For example, some dealers and even construction teams will add talc, fly ash, etc. to the waterproof coating to increase its thickness, or use waste rubber powder to add mortar.
Pollution is incurable due to "invisibility"
In addition to poor waterproof performance, poor quality waterproof coatings are a problem that cannot be ignored. Nanjing Haitai Nano Indoor Pollution Control Engineer Zhou Haiyan told reporters that the more serious pollution in the waterproof coating is some tar-containing polyurethane products. Such paints are generally made from coal tar or raw materials containing some coal tar. Volatilized tar oil has a pungent odor.
Due to the large molecular weight of tar oil, it is easy to deposit in indoor environments where air does not circulate. Excessive inhalation in a short period of time can cause rapid poisoning and death. And this type of waterproof coating using organic solvent as a diluent, the ingredients are mostly toluene, xylene and other toxic substances, long-term low-dose inhalation of tar oil and benzene, can cause respiratory diseases and dizziness, nausea, and even severe cancer.
“Using water-repellent coatings containing contaminated materials will cause indoor environmental pollution for a long time and it will not be easy to remove. Even if you want to comprehensively treat pollution, it is basically impossible. Because the pollution caused by the waterproof coating is hidden under the tiles.â€
Buy waterproof coating with reference standards
The reporter also learned that at present, the genuine waterproof paints sold in supermarkets in Nanjing are packed in 2.5 kg to 20 kg, with prices ranging from 40 to 50 yuan, including oil paints, water-based paints, and polymer waterproof materials. And other categories.
Industry experts remind consumers that they should purchase waterproof coatings from large-scale and regular decorative materials stores, and choose water-based coatings, waterproof coatings, waterproof mortars, or polymer cement-based waterproof coatings. For example, the polymer cement-based waterproof coating is a synthetic emulsion composed of various aqueous polymers. It is composed of high-quality cement mixed with additives. The flexibility of the polymer (resin) is integrated with the rigidity of the cement to make it have good impermeability. And stability, and convenient construction and low cost.
In addition, the contents of the "Limitations of Harmful Substances in Building Waterproof Coatings" can be used as a reference in the current purchase. For example, the standard classifies waterproof coatings into A and B grades, of which A grades are environmental protection type waterproof coatings; according to the nature of waterproof coatings, they are divided into three types: waterborne, reactive, and solvent-based, among which the limits of harmful substances in water-based waterproof coatings are stricter than "Indoor interior decoration materials interior wall paint harmful substances" provisions of the index. It can be seen that if home improvement is to pursue environmental protection, A-grade waterproof coating or water-based waterproof coating should be the first choice.