Paint standard: Study on the safety limit standard of paint flash point at home and abroad

Core tip: Abstract: This paper introduces the flash point of commonly used solvents in paint production, analyzes the safety limit standards of paint flash point at home and abroad, and puts forward suggestions for controlling the flash point of paint, in order to standardize the production and use of paint in China, and provide reference for the formulation and revision of paint flash point limit standards Key words: coating; flash point; safety limit; standard Preface Fire or explosion events caused by coatings occur from time to time, seriously endangering the life and property safety of consumers The flash point of paint is an important parameter to characterize the fire risk of paint The lower the flash point, the more dangerous it is Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Abstract: This paper introduces the flash point of commonly used solvents in paint production, analyzes the safety limit standards of paint flash point at home and abroad, and puts forward suggestions for controlling the flash point of paint, in order to standardize the production and use of paint in China, and provide reference for the preparation and revision of paint flash point limit standards Key words: coating; flash point; safety limit; the fire or explosion events caused by coating happen from time to time, seriously endangering the life safety and property safety of consumers The flash point of paint is an important parameter to characterize the fire risk of paint The lower the flash point, the greater the risk [1] Flash point of paint refers to the lowest temperature at which the steam escaping from heating the sample in the flash cup can flash instantly in the presence of flame A large number of flammable liquids are used as solvents in coatings They have low flash point and are easy to volatilize In the process of coating production, storage, transportation and construction, they are very easy to cause fire or explosion accidents According to the flash point of the coating, it can be used to determine the fire resistance rating, number of floors, floor area, safe evacuation, fire separation, explosion-proof facilities, etc of the coating production, storage plant and warehouse In addition, the flash point is also the basis for selecting the fire extinguishing agent and determining the fire extinguishing intensity [2] Therefore, it is of great significance to study the flash point limit standards and requirements related to coatings This paper introduces the flash point of common solvents in the production of coatings, analyzes the safety limit standards of flash point of coatings at home and abroad, and puts forward suggestions for controlling the flash point of coatings, in order to standardize the production and use of coatings in China, and to provide reference for the preparation and revision of the flash point limit standards of coatings 1 Common solvents in the production of coatings Common solvents in the production of coatings include toluene, xylene, 200? Solvent oil, n-butanol, isobutanol, isopropanol, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, cyclohexanone, styrene, butyl acrylate, methyl acrylate, etc [3] These solvents and auxiliaries are generally flammable liquid or flammable liquid with low flash point Therefore, the flash point of the flammable liquid like coating depends on the flash point of the solvent used in the coating [4] The flash point and characteristics of common solvents in the coating production process are shown in Table 1 It can be seen from table 1 that the flash points of common solvents in the coating production process are all lower than 50 0, where the flash point of toluene is 4 The flash points of ethyl acetate, acetone and methyl ethyl ketone are all lower than 0 0, respectively - 4 C, -18 C - 7.2 ° & according to the fire risk classification method specified in the code for fire protection design of buildings [5] of 08500-2006, the fire risk of toluene, isobutanol, isopropanol, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone and methyl acrylate in the solvents frequently used in the production of coatings belongs to class a, and the other solvents are class B 2 at present, there are 12 standards related to the limit of flash point in coatings in China, which are all industry standards These 12 standards respectively set the limit requirements for the flash point of corresponding coating products, as shown in Table 2 Table 1 flash point and characteristics of common solvents in coating production table 1 name of common solvents and characteristic substances in coating production table 2 standards and requirements for flash point limit of coatings in China Table 2 standards and requirements for flash point limit of coatings in China The flash point is the basis for the classification of flammable liquids, according to which the flammable liquids can be divided into the following four categories: the first category is that the flash point is below the shape; the second category is that the flash point is 28? 45 ° 00; the third category is that the flash point is 45? 120c; the fourth category is that the flash point is above 120 ^, such as lubricating oil and glycerin Among them, the liquid belonging to the first and second categories is called flammable liquid, and the liquid belonging to the third and fourth categories is called flammable liquid The flash point of flammable liquid depends on the flash point of the solvent used in the coating It can be seen from table 2 that the flash point limit values of relevant coatings and driers for coatings in China are basically - 10? 32 ° [among them, the flash point limit values specified in shameba2245-1991 nitropencil paint of all colors, shameba2246-1991 nitropencil primer of all colors and Hg / t2596-1994 perchloroethylene enamel of all colors are below 0 ° 0, respectively - 10C, - 10 ° 0 and - 3C; The flash point limit values specified in L04-1 asphalt enamel (Hg / t3348-1987) and Hg / t2276-1996 rare earth driers for coatings are relatively high, 32c It is worth noting that the standards of alkyd resin coating (08 / T2, 51-2010) implemented on August 1, 2011, such as Gong 6 / Ding 2, Zhao 49-2010, amino alkyd resin coating, are based on the reason that "the flash point is only related to the storage and transportation safety of the coating, rather than directly related to the quality and performance of the coating", and "flash point" is not set At present, the European Union, the United States, Japan and other countries do not have the standards and regulations directly for the flash point limit requirements of coating products, but all countries have classified coating and similar products as dangerous goods, and made corresponding requirements for the label, packaging, storage and transportation of coating (1) The international maritime dangerous goods (IMDG) code is an international maritime organization ）According to the developed regulations, the relevant provisions for coatings are as follows: basically, all the coatings are flammable liquids, and a small part of them are classified as toxic or corrosive substances; according to the viscosity, closed cup flash point and solvent separation test, the coatings that meet the classification standard are one level wider than the general flammable liquids, such as the closed cup flash point is 23? 60 ° 0, with a large viscosity, and the coatings that will not be separated by solvent can not be classified It is a flammable liquid; the closed cup flash point is lower than 23 ° 0, the viscosity is very large, and the coating which can not be separated by solvent is classified as the packaging category 111 of flammable liquid According to the provisions of 11 ^ 0, the hazardous characteristics of UN paint products with product numbers of un1139, un1263, un3066, un3469 and unqu70 are classified as follows: un1139 paint solution, class 3 flammable liquid, un1263 paint, class 3 flammable liquid, un3066 paint, class 8 corrosive un3469 paint, flammable (primary hazard), corrosive (secondary hazard) The classification results of hazard characteristics of wood coatings with product number un1139 in un3470 corrosion (major hazard) and flammability (minor hazard) standards are shown in Table 3 Table 3 hazardous characteristics of wood coatings Table 3 hazardous characteristics of wood coatings (2) the European Union chemical classification, labeling and packaging act is a European Union Act on classification, labeling and packaging of chemical substances and mixtures The implementation of GHS is part of the implementation of GHS in EU See Table 4 and table 5 for the hazard classification of coating products by EU Table 4 danger of coating aerosol (flammable gas sol) table 4 danger of coating aerosol (flammable gas sol) can be seen from table 4 EU defines the danger classification of coating aerosol (flammable gas sol) as extremely flammable gas sol and flammable gas sol, and their warning words are danger and warning respectively Table 5 Classification of flammable liquid coatings can be seen from table 5 The European Union defines the hazard classification of flammable liquid coatings as: extremely flammable liquid and vapor, highly flammable liquid and vapor, flammable liquid and vapor, and the warning words are respectively: danger, danger and warning (3) There is no limit requirement for the flash point of relevant coating products in 18 ° f 651-2002 amino alkyd resin coating, JIS ° f 562-2003 phthalic acid resin varnish, 18k5572-2003 phthalic acid resin paint and other standards Conclusion: the flash point is an important safety index The lower the flash point, the more likely the coating is to fire or explode in the process of production, storage, transportation and construction Through the study on the safety limit standard of flash point of coatings at home and abroad, it is found that the flash point of common solvents in coating production is mostly low, which is flammable solution; There are 12 standards related to the limit of flash point in coatings in China, while the European Union, the United States and Japan have no direct standards and regulations for the limit of flash point of coatings, nor do they stipulate the limit value of flash point of coatings; the European Union classifies the risk degree of coatings according to the level of flash point, and requires corresponding warning instructions on labels and packages, while the relevant standards in China do There is a limit requirement, but there is no similar requirement for product label and packaging Therefore, in order to protect people's life and property safety, it is suggested to further strengthen the control of paint flash point, and make corresponding warning requirements for product label and packaging Reference [1] Qin Shangwen Safety management of explosives] Chengdu: Sichuan Science and Technology Press, 1988:268-269 [2] Mao Lei, Qian yemiao Determination of flash point of coating [J] Shanghai coating, 2008, 46 (8): 43-45 [3] China Coating Industry Association Guidelines for fire and explosion protection in coating production [magic Coating and electroplating, 2007, 5:4-7 [4] Li Changwen, Sun Yan, Wang Ke, et al Latest practical manual of explosion-proof safety technology ["] Tianjin: electronic publishing house, 2004:151-217 [5] Ministry of public security of the people's Republic of China + GB50016-2006 code for fire protection design of buildings Beijing: China planning publishing house, 2006 coatings house is focused on coatings, diatom mud, paint coating, coating process, news information and coatings of fire-resistant coatings, diatom mud, Paint coating, coating process, decoration knowledge and decoration effect drawing of fire retardant coating,