As we all know, waterproof coatings and waterproofing membranes are two types of waterproof materials that are widely used in waterproof engineering. Waterproof coatings are widely used in roofing, toilets, and underground waterproofing projects. In the past ten years, it has expanded into functional waterproofing areas such as bridges, tunnels, subways, water conservancy, reservoirs, and sewage treatment.
Its excellent waterproof performance, easy construction and other features make it attractive to the engineering community. However, in the production of waterproof coatings, some companies use tar and other toxic substances as solvents, and harmful substances are volatilized in the process of production and construction. As a result, workers are poisoned and killed every year. This not only seriously pollutes the environment but also jeopardizes production and construction. Personnel health.
Currently, there are no determination standards and applicable measurement methods for "non-tar" and "green" waterproof coatings sold on the market. Waterproof coating market, muddy sand, all kinds of fish and dragons mixed, good and bad, true and false hard to distinguish, the development of a unified national "construction of waterproof paint harmful substances" industry standards become a top priority.
A few days ago, the National Lightweight and Decorative Building Materials Standardization Technical Committee held an industry review meeting for the “Restriction of Hazardous Substances in Building Waterproof Coatings.†The meeting reviewed and passed the standard, and it is recommended that it be submitted to the National Development and Reform Commission for approval, promulgation, and implementation as soon as possible. In order to formulate the "Restriction of Hazardous Substances in Building Waterproof Coatings" industry standard, it is responsible for drafting standard units.
China Chemical Construction Corporation Suzhou Waterproof Materials Research and Design Institute, Building Materials Industry Technology Supervision Research Center Organized well-known domestic scientific research institutes, quality inspection agencies and China Construction Materials Inspection and Certification Center, Beijing Institute of Building Materials Science, Shanghai Academy of Building Research Shenzhen Institute of Building Science has widely collected various types of waterproof coatings on the production and waterproof markets across the country and conducted three systematic test verifications to determine the “industrial limits for hazardous substances in building waterproof coatingsâ€. Technical indicators and applicable test methods.
In the test verification process, the same sample was found, and the test results of some technical indicators in different laboratories were quite different. In order to reduce the experimental error in the laboratory and improve the reproducibility of the test method, the test results can accurately reflect the content of harmful substances in the waterproof coating. The scientific research institutes and quality inspection agencies that participated in the test verification have met many times to analyze the test results. , Looking for reasons, from the sampling, storage time and preparation to test conditions, details of the operation, the calculation of test results, etc., one by one listed, compare each other, find differences, achieve unity, so that the five units participating in the test verification in the test method The maximum possible consistency is to ensure the accuracy and comparability of the test results and to provide a reliable scientific basis for standard setting.
The formulation of the "Industrial Waterproofing Coatings Harmful Substance Limits" industry standard is a scientific and technological achievement obtained through the collaborative efforts of research institutes, quality inspection agencies and production companies. Six domestic research institutes and quality inspection agencies participate in the drafting and undertake the task of experimental research. Eight well-known domestic waterproof coating companies participated in the drafting, including Guangdong Keshun, Shanghai Tunnel, Wet Kewei, Beijing Donghai, and Dongfang Yuhong.
BASF China also actively participated in the drafting of standards. In the examined and passed “Industrial Waterproofing Coatings Harmful Substances Limits†industry standard, the stipulated standards “apply to auxiliary materials used for building waterproof coatings and waterproof materialsâ€.
Waterproof coatings are classified into Class A and Class B according to the content of harmful substances. Grade A is an environmental protection type waterproof coating; Grade B content as a threshold for waterproof coatings to enter the market is the minimum requirement that waterproof coatings must meet.
According to the nature of the building waterproof coating is divided into: water-based, reactive, solvent-based three types of waterproof coatings. Water-based and reactive waterproof coatings are classified into A and B according to the content of harmful substances, and only solvent-based waterproof coatings are of Class B.
Standard requirements for the sum of volatile organic compounds (VOC), free formaldehyde, benzene, toluene, ethylbenzene, and xylene, soluble heavy metals (lead, cadmium, chromium, mercury), phenol,è’½, naphthalene, free TDI, etc. were separately specified. The limit of harmful substances in water-based waterproof coatings is stricter than that specified in GB18582-2007 "Limits for Harmful Substances in Interior Decoration Materials for Interior Wall Coatings" (approved draft).
Its excellent waterproof performance, easy construction and other features make it attractive to the engineering community. However, in the production of waterproof coatings, some companies use tar and other toxic substances as solvents, and harmful substances are volatilized in the process of production and construction. As a result, workers are poisoned and killed every year. This not only seriously pollutes the environment but also jeopardizes production and construction. Personnel health.
Currently, there are no determination standards and applicable measurement methods for "non-tar" and "green" waterproof coatings sold on the market. Waterproof coating market, muddy sand, all kinds of fish and dragons mixed, good and bad, true and false hard to distinguish, the development of a unified national "construction of waterproof paint harmful substances" industry standards become a top priority.
A few days ago, the National Lightweight and Decorative Building Materials Standardization Technical Committee held an industry review meeting for the “Restriction of Hazardous Substances in Building Waterproof Coatings.†The meeting reviewed and passed the standard, and it is recommended that it be submitted to the National Development and Reform Commission for approval, promulgation, and implementation as soon as possible. In order to formulate the "Restriction of Hazardous Substances in Building Waterproof Coatings" industry standard, it is responsible for drafting standard units.
China Chemical Construction Corporation Suzhou Waterproof Materials Research and Design Institute, Building Materials Industry Technology Supervision Research Center Organized well-known domestic scientific research institutes, quality inspection agencies and China Construction Materials Inspection and Certification Center, Beijing Institute of Building Materials Science, Shanghai Academy of Building Research Shenzhen Institute of Building Science has widely collected various types of waterproof coatings on the production and waterproof markets across the country and conducted three systematic test verifications to determine the “industrial limits for hazardous substances in building waterproof coatingsâ€. Technical indicators and applicable test methods.
In the test verification process, the same sample was found, and the test results of some technical indicators in different laboratories were quite different. In order to reduce the experimental error in the laboratory and improve the reproducibility of the test method, the test results can accurately reflect the content of harmful substances in the waterproof coating. The scientific research institutes and quality inspection agencies that participated in the test verification have met many times to analyze the test results. , Looking for reasons, from the sampling, storage time and preparation to test conditions, details of the operation, the calculation of test results, etc., one by one listed, compare each other, find differences, achieve unity, so that the five units participating in the test verification in the test method The maximum possible consistency is to ensure the accuracy and comparability of the test results and to provide a reliable scientific basis for standard setting.
The formulation of the "Industrial Waterproofing Coatings Harmful Substance Limits" industry standard is a scientific and technological achievement obtained through the collaborative efforts of research institutes, quality inspection agencies and production companies. Six domestic research institutes and quality inspection agencies participate in the drafting and undertake the task of experimental research. Eight well-known domestic waterproof coating companies participated in the drafting, including Guangdong Keshun, Shanghai Tunnel, Wet Kewei, Beijing Donghai, and Dongfang Yuhong.
BASF China also actively participated in the drafting of standards. In the examined and passed “Industrial Waterproofing Coatings Harmful Substances Limits†industry standard, the stipulated standards “apply to auxiliary materials used for building waterproof coatings and waterproof materialsâ€.
Waterproof coatings are classified into Class A and Class B according to the content of harmful substances. Grade A is an environmental protection type waterproof coating; Grade B content as a threshold for waterproof coatings to enter the market is the minimum requirement that waterproof coatings must meet.
According to the nature of the building waterproof coating is divided into: water-based, reactive, solvent-based three types of waterproof coatings. Water-based and reactive waterproof coatings are classified into A and B according to the content of harmful substances, and only solvent-based waterproof coatings are of Class B.
Standard requirements for the sum of volatile organic compounds (VOC), free formaldehyde, benzene, toluene, ethylbenzene, and xylene, soluble heavy metals (lead, cadmium, chromium, mercury), phenol,è’½, naphthalene, free TDI, etc. were separately specified. The limit of harmful substances in water-based waterproof coatings is stricter than that specified in GB18582-2007 "Limits for Harmful Substances in Interior Decoration Materials for Interior Wall Coatings" (approved draft).
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