Current situation analysis and development trend o

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Analysis on the current situation and development trend of pigment standardization in China

1 analysis on the current situation of pigment standardization

1.1 basic information

since the establishment of the Standardization Committee, through the joint efforts of several generations of standardization authors in the field of pigment, the work of pigment standardization has made remarkable progress. At present, there are 62 pigment standards under the centralized management of the National Technical Committee for standardization of paints and pigments, including 45 national standards and 17 industrial standards. The content includes the basic, pigment products and test methods applicable to the pigment field. These standards constitute the existing national and industrial standard system for pigments and play an important role in guiding production, improving product quality, promoting trade and promoting the application and development of products

the pigment branch of the National Technical Committee for standardization of paints and pigments (tc5/sc8) is the centralized management department of national pigment standards. Mainly responsible for the centralized work of standardization technology in the pigment field, and the main tasks include organizing the formulation and revision of pigment standards; As a technical support, cooperate with the state to formulate standardization guidelines and policies; Establish the standardization system table of the field according to the development organization of the industry; Review and confirm the standards regularly; Participate in the international standardization activities of pigments, and make statements, follow-up, analysis and Research on the international standards of pigments; Standard publicity and implementation training; Development and distribution of standard samples, etc

at present, the rate of adopting international standards in the field of pigments in China is about 59%, and most of the higher standards are test method standards. The conversion rate of data processing and analysis by microcomputer in the corresponding international standards is 46%, and some physical pigment standards, dispersion evaluation methods and dispersion method standards fail to be translated into Chinese standards in time

1.2 application of standards

the existing pigment standards have played an important role in the development of China's pigment industry and related fields. The construction of sports fields with recycled plastics and other materials in the United States has played an important role, which is mainly reflected in:

1.2.1 the technology used by enterprises to organize production, carry out trade and the government to regulate the market is based on the existing product standards and test method standards, and most standards have a very high utilization rate, Most enterprises take this as the technical basis for organizing production and trade. These standards not only serve the market, but also play a role in standardizing the market. For example, quality supervision departments at all levels organize product quality supervision and random inspection according to the standards, which 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 foundation for the rapid and healthy development of China's pigment industry and related fields

1.2.2 promote the product structure adjustment of the pigment industry

through the formulation and revision of standards, promote the development of advanced technology, 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 pigments, chromium oxide green pigments and mica pearlescent pigments. The market access threshold has been raised by improving technical indicators, so that substandard products cannot enter the market, backward products have been eliminated, and the development, promotion and application of new technologies and new products have been promoted

1.3 comparison of domestic and international situations

national and industrial standard systems for pigments have both commonalities 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 test methods and product standards, but also basic standards related to the field of pigments, such as classification, naming and sampling. 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 pigments and organic pigment product standards considered by researchers. The number of international standards is 80, including 42 test method standards (9 of which have been transformed into the coating standard system, and most of which have been transformed into national standards), 38 product standards, which are composed of inorganic pigments and physical pigments, including 22 physical pigments

there is no corresponding international standard for organic pigment product standards, and no corresponding foreign advanced standards have been retrieved, so the adoption of organic pigment standards is still blank. Although there are international standards for inorganic pigments, the two indicators that reflect the main characteristics of pigments - color and tinting power are "agreed" in the international standards. Therefore, the standards previously formulated usually select standard samples according to the domestic practice and the actual domestic level. This practice is also different from the international practice. The pigment standards formulated in recent years have gradually reversed this practice and maintained international standards, For example, the titanium dioxide (titanium dioxide pigment) standard submitted for approval was completed in 2003, and the chromium green standard submitted for approval was completed in 2004

1.4 preparation and revision of standards in recent years

organizing the preparation and revision of national and industrial standards is the most important content in the standardization work. Since 2002, five national and industrial standards have been prepared and revised:

revising the national standard gb/t 5211 Determination of water soluble matter in pigments - Cold extraction method, which was submitted for approval in 2002 and issued and implemented in 2003

revise the national standard gb/t 5211 Determination of water soluble matter in pigments - thermal extraction method, which was submitted for approval in 2002 and issued in 2003

the above two standards are equivalent to the corresponding international standards (iso:2000 and iso: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 GB titanium dioxide pigments was revised and submitted for approval in 2003. At present, it is in the stage of awaiting approval. The international standard iso: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 belongs to the international advanced level. The standard does not involve personal health and safety, environmental protection and other issues, so its attribute is changed from mandatory to recommended. Compared with the previous version of GB, the main modifications of this standard are as follows: 1) product classification. The products in this standard are divided into 2 types (anatase and rutile) and 5 varieties (A1, A2, R1, R2 and R3), which are completely consistent with the international standards. GB is divided into 2 types (anatase and rutile) and 3 varieties (BA, Ba and BA), and each variety is divided into 3 grades (qualified product, first-class product and excellent product); 2) Standard sample: the agreed reference sample is used in this standard, and the selected standard sample is used in GB; 3) Determination method of color and scattering force. In this standard, the instrument method (gb/t5211.) is added in addition to the visual method in GB, The instrument method is used to measure the scattering force instead of the visual method in the original standard; 4) Technical indicators, some performance indicators such as oil absorption, pH value of water suspension, etc. are changed to agreed upon. The release and implementation of the standard will solve many problems existing in the implementation of the original titanium dioxide pigment standard over the years (such as inappropriate standard attributes, low standard level, limitations of standard samples, 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 commercial standard mica pearlescent pigment was formulated, which was submitted for approval in 2003 and issued in 2004. The standard number is hg/t. 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 include: appearance, brightness, color, particle size distribution, impurity content, volatile matter at 105 ℃, oil absorption, conductivity of water suspension and pH value of water suspension. The standard refers to relevant foreign materials and takes full account of China's actual situation, making the standard not only progressiveness, scientific, but also practical and operable. It provides a basis for standardizing product production, improving product quality, and enhancing enterprises' ability to participate in international competition

the national standard chromium oxide green pigment was formulated and submitted for approval in 2004. It is currently in the stage of pending approval. The international standard ISO 4621:1986 is adopted for the revision of the standard. The project settings are completely consistent with the international standard. According to the actual production level in China, the technical indicators rise and fall. In addition to the general pigment performance and application performance, the standard inspection items also focus on 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 to the results of standard cleaning and evaluation

2004 is the year of national standard cleaning and rectification. According to the relevant requirements of the superior departments, the Secretariat invited seven technical experts who are familiar with the situation in the field of pigments. The way of centralized discussion and evaluation was adopted. First, the staff of the Secretariat introduced the adoption and use of each standard to the experts, and then the experts discussed and put forward the evaluation conclusions

among the 45 national standards for pigments evaluated, there are 2 mandatory standards and 43 recommended standards. The evaluation conclusion is that:

29 continue to be effective

9 are revised

6 are integrated and revised

1 is abolished

the evaluation conclusion of the 2 national standards for pigments evaluated is continued

1.6 main problems in standardization work

1.6.1 the standard age is too long

about 81% of the national standards in the field of pigments have a standard age of more than 10 years. Most of the standards were formulated in the middle and late 1980s, and about 90% of the standards have a standard age of more than 5 years. The standard age is too long

1.6.2 it is difficult to participate in international standardization substantively.

due to financial reasons, the communication between the Secretariat and iso/tc35/sc2 mainly relies on contacts and letters. 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 still unable to revise relevant standards in time with international standards, and there are still many difficulties in substantive participation in international standardization activities

1.6.3 enterprises still lack the understanding of substantive participation in the drafting of international standards

after China's accession to the WTO, some developed countries tend to set up non-tariff trade barriers by formulating standards. However, enterprises do not fully understand the importance of synchronous standard acquisition and active participation in the drafting of international standards

2 development trend of pigment standardization

2.1 development trend

according to wto/tbt regulations, the United States, Germany, Britain, Japan and other industrial countries have promised to adopt international standards as the technical basis for market access in international trade. At present, although the adoption rate of international standards and the conversion rate of international standards in the field of pigments in China are higher than those in some fields (e.g. standards in the field of coatings), there is still a big gap compared with developed countries. Therefore, firstly, the work of pigment standardization should continue to adhere to the adoption of international standards, improve the degree of adoption of standards, and promote the technological progress of the industry, Improve the competitiveness of pigment products in the international market to promote product export and achieve good economic benefits; Second, we should attach importance to substantive participation in the formulation and revision of international standards, and change passivity into initiative through unremitting efforts, so as to improve the ability of enterprises to actively respond to the needs of domestic and foreign markets

in view of the problems existing in the current industry, pay attention to the review of old standards, and timely organize the revision of old standards that can not meet the development needs; Actively track the development of high-tech products and carry out standardization work in these fields in time; To carry out research on technical trade measures for products, and carry out research on exports that are greatly affected by foreign technical barriers to trade

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