Coating standard: analysis of current situation and development trend of pigment standardization in China

Core tips: 1 Analysis of the current situation of pigment standardization 1.1 basic information Since the establishment of the standard committee, with the joint efforts of several generations of standard chemical authors in the field of pigment, the pigment standardization work has made remarkable progress At present, there are 62 pigment standards under the centralized management of the National Technical Committee for coatings and pigment standardization, including 45 national standards and 17 industrial standards The content includes the standards applicable to the field of pigments, pigment products and test methods These standards constitute the existing national and industrial standards system of pigments, which guide production, improve product quality and promote trade Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Home of coatings news: 1 Analysis of the current situation of pigment standardization At present, there are 62 pigment standards under the centralized management of the National Technical Committee for coatings and pigment standardization, including 45 national standards and 17 industrial standards The content includes the standards applicable to the field of pigments, pigment products and test methods These standards constitute the existing national and industrial standards system of pigments, which play an important role in guiding production, improving product quality, promoting trade and promoting the application and development of products The pigment branch (TC5 / SC8) of the National Technical Committee for coatings and pigment standardization is the centralized management department of the national pigment standard It is mainly responsible for the centralized management of standardization technology in the field of pigments, with the main tasks of organizing the formulation and revision of pigment standards; cooperating with the state as technical support to formulate standardization work guidelines and policies; establishing standardization system table in the field according to the development organization of the industry; reviewing and confirming the standards regularly; participating in the international standardization activities of pigments, expressing and tracing the international standards of pigments Tracking and analysis research; standard publicity and implementation training; development and distribution of standard samples, etc At present, the standard collection rate of the international standard in the field of pigment in China is about 59%, and most of the standards with high standard collection degree are test method standards The conversion rate of the corresponding international standards is 46% The main standards that fail to be converted into Chinese standards in time are some physical pigment standards, dispersion evaluation methods and dispersion method standards 1.2 application of standards existing pigment standards have played an important role in the development of China's pigment industry and related fields, which are mainly reflected in: 1.2.1 technical basis for enterprises to organize production, carry out trade and government to regulate market Most of the existing product standards and test method standards have a very high utilization rate Most of the enterprises take this as the technical basis for organizing production and conducting trade These standards not only serve the market, but also regulate the market For example, quality supervision departments at all levels organize random inspection of product quality according to the standards, effectively improve the market management and supervision ability, maintain the market order, create a fair competition market environment, promote the development of trade, and lay a solid foundation for the rapid and healthy development of China's pigment industry and related fields The foundation 1.2.2 promote the product structure adjustment of pigment industry, promote the development of advanced technology through the formulation and revision of standards, guide the product orientation and market orientation, and make advanced technology and products gradually meet the needs of China's pigment product structure adjustment In recent years, some product standards have been formulated and revised, such as titanium dioxide pigment, chrome oxide green pigment and mica pearlescent pigment By improving the technical indicators, the market access threshold has been raised, so that substandard products cannot enter the market, backward products have been eliminated, and the development and application of new technology and new products have been promoted 1.3 comparison of national and industrial standard systems of pigments at home and abroad has both commonness and particularity compared with ISO The international standard system is mainly composed of test methods and product standards The national and industrial standard system includes not only the test methods and product standards, but also the classification, naming, sampling and other basic standards in the field of pigments Most of the pigment test methods adopt the corresponding international standard methods In addition to the basic standards, there are 57 national and industrial standards in the field of pigments, including 34 test method standards and 23 product standards, which are mainly composed of inorganic and organic pigment product standards The number of international standards is 80, including 42 test method standards (9 of which are transformed into coating standard system, and most of them have been transformed into national standards), 38 product standards, which are composed of inorganic pigment and physical pigment standards, 22 of which are physical pigment standards There is no corresponding international standard for organic pigment product standard, and no corresponding foreign advanced standard has been retrieved, so the standard collection of organic pigment is still blank Although there are international standards for inorganic pigments to be adopted, due to the two indicators reflecting the main characteristics of pigments - color and tinting power, they are all "agreed" in the international standards Therefore, the standards previously formulated are usually selected according to the domestic habits and the actual domestic level, which is also different from the international practices The pigment standards formulated in recent years have been gradually twisted This method should be changed and kept in line with the international standards, such as the titanium dioxide (titanium dioxide pigment) standard which was submitted for approval in 2003 and the chrome green standard which was submitted for approval in 2004 1.4 in recent years, the preparation and revision of national standards and industrial standards are the most important contents in the standardization work Since 2002, five national standards have been prepared and revised: the national standard GB / t5211.1-1985 determination of water soluble pigments - Cold extraction method has been revised, which was submitted for approval in 2002 and issued for implementation in 2003; The national standard GB / t5211.2-1985 "determination of water soluble matter in pigments - thermal extraction method" was revised, which was submitted for approval in 2002 and implemented in 2003; The above two standards are equivalent to the corresponding international standards (iso787-8:2000 and iso787-3:2000) The introduction of advanced technologies in the standards (such as the use of membrane filters to improve the filtration effect, the use of centrifugal separation steps, etc.) provides a more advanced and more operational test method for domestic pigment manufacturers, distributors and users The national standard gb1706-1993 titanium dioxide pigment was revised, which was submitted for approval in 2003 and is still in the stage of approval The international standard iso591-1:2000 is adopted for the revision of the standard The project settings and technical indicators are completely consistent with the international standard, and the standard level is advanced in the world This standard does not involve human health and safety, environmental protection and other issues, so its attribute is changed from mandatory to recommended Compared with the previous edition gb1706-1993, the main modifications of this standard are as follows: 1) product classification The products in this standard are divided into two types (anatase and rutile) and five varieties (A1, A2, R1, R2 and R3), which are completely consistent with the international standard Gb1706-1993 is divided into two types (anatase and rutile) and three varieties (BA01-01, ba01-02 and ba01-03), each of which is divided into three grades (qualified product and one grade) 2) standard sample, in which the agreed reference sample is used, and the selected standard sample is used in gb1706-1993; 3) determination method of color and scattering force, in which the color determination retains the visual method in gb1706-1993 and instruments are added Method (GB / t5211.20-1999), the instrument method is used to determine the scattering force instead of the visual method in the original standard; 4) technical indexes, such as oil absorption, pH value of water suspension and other project indexes are changed to be agreed The publication and implementation of the standard will solve many problems existing in the implementation of the original titanium dioxide pigment standard for many years (such as inappropriate standard attributes, low standard level, limitations of standard samples and large test errors of color and other items), and lay a good foundation for enhancing the international competitiveness of China's titanium dioxide products and promoting titanium dioxide products to the international market The bank standard "mica pearlescent pigment" was formulated, which was submitted for approval in 2003 and issued in 2004 The standard number is Hg / t3744-2004 In the standard, the products are divided into four categories: silver white series, Rainbow series, iron oxide metal series and iron titanium composite metal series The project settings are: appearance, brightness, color, particle size distribution, impurity content, volatile matter at 105 ℃, oil absorption, conductivity of water suspension, pH value of water suspension The standards refer to the relevant foreign data and take full account of the actual situation in China The standards are advanced, scientific, practical and operable, which provide a basis for standardizing product production, improving product quality and enhancing enterprises' participation in international competitiveness The national standard "chrome oxide green pigment" was formulated, which was submitted for approval in 2004 and is still in the stage of approval The international standard iso4621:1986 is adopted for the revision of the standard The project setting is completely consistent with the international standard According to the actual production level and technical indicators in China, the standard inspection items include not only the performance and application performance of general pigments, but also the control of "soluble chromium content" harmful to human body, which is of practical significance for promoting the application and development of the pigment 。 1.5 introduction of evaluation results of standard cleaning 2004 is the year of national standard cleaning and rectification According to the relevant requirements of superior departments, the Secretariat invited seven technical experts who are familiar with the situation in the field of pigments, and adopted the way of centralized discussion and evaluation First, the personnel of the Secretariat introduced the situation of standard selection and use to the experts, and then the experts discussed and put forward the evaluation conclusions together Among the 45 national standards for pigments evaluated, there are 2 compulsory standards and 43 recommended standards The evaluation conclusion is: 29 items are still valid, 9 items are revised, 6 items are revised, 6 items are revised, and 1 item is abolished The evaluation conclusion of 2 items of national standard plan for pigments evaluated is still implemented 1.6 main problems in the standardization work 1.6.1 about 81% of the national standards in the field of pigment with a standard age of more than 10 years, most of which are standards formulated in the middle and late 1980s, and about 90% of which have a standard age of more than 5 years, and the standard age is too long 1.6.2 substantial participation in international standardization is difficult due to financial reasons The communication between the Secretariat and ISO / TC35 / SC2 mainly relies on network and letter At present, the international standardization work in the field of pigments is still in the state of passive tracking, collection and transformation of international standards It is not yet possible to revise relevant standards in time with international standards, and there are many difficulties in substantive participation in international standardization activities 1.6.3 after China's accession to WTO, some developed countries tend to set up non-tariff trade barriers by making standards However, the importance of enterprises to take part in the drafting of international standards is not enough 2 Development trend of pigment standardization 2.1 according to WTO / TBT, the United States, Germany, Britain, Japan and other industrial countries are committed to adopting international standards as market access in international trade