HG/T 4336-2012 "Glass Scale Anti-corrosion Coatings" standard-setting overview

HG/T 4336-2012 "Glass Scale Anticorrosion Coatings" Standard Development Overview
In Jie, Su Chunhai, Fang Jianjun, Shengfan (CNOOC Changzhou Coatings and Chemical Research Institute Co., Ltd., Changzhou, Jiangsu 21 3016)
Glass scale anti-corrosion coating is epoxy resin or other corrosion-resistant resin as the main film-forming substance, thin-sheet glass scales for the bone to add other pigments, solvents, etc. made of thick slurry-type anti-corrosion coating. Glass is an excellent chemical and aging-resistant inorderable material. Glass scales are extremely thin pieces of glass that are melted at a high temperature of 1,700 degrees C and blown by a unique process, with a thickness of 2 to 5 m and a diameter of 100 to 3,000 m

. The larger the diameter of the glass scales, the stronger the anti-penetration performance of the coating. Glass scales can divide the coating into many small spaces, so that the micro-cracks and micro-bubbles in the coating are separated from each other, while inhibiting the penetration of capillary action. The hardening shrinkage of glass scales is only one-tenth to one-tenth that of other materials, which greatly improves the adhesion and impact resistance of the coating, and inhibits defects such as cracking and peeling of the coating. The glass scales in the coating are staggered up and down, forming a unique shielding structure and the complex and tortuous osmosis diffusion path of the medium inside the coating, thus effectively extending the time of media penetration to the substation, improving the anti-penetration performance and corrosion resistance of the coating, and making it an ideal surface heavy anti-corrosion material, characterized by corrosion resistance, osmosis, wear resistance, simple construction and easy repair. At present, glass scale coatings are widely used in chemical, metallurgy, chemical fiber, electroplating, construction and other industries, especially in a variety of marine engineering equipment, offshore oil and gas platforms, harbor terminals and ships and other fields. In the mid-1950s, the United States first developed and manufactured glass scale coatings, in the 1960s the United States will be glass scale coating technology transfer, into Europe, Japan, the application of the field from the petrochemical, marine areas to transportation, energy and industrial water treatment and other industries, in the mid-1980s, China began to develop a variety of glass scale coatings, film. At present, in the production and research field of glass scales, the quality and surface treatment capacity of domestic glass scales has reached the international advanced level. Because of the chemical inertness of glass scales, it has a good matching properties, with chlorinated rubber, chlorine polyethylene, epoxy resin, epoxy coal asphalt, phenolic epoxy resin, unsaturated polyester resin and ethylene esters and other resins to form anti-corrosion coatings. China has a broad prospect in the field of anti-corrosion of glass scale coatings, in order to standardize the production and use of the product, improve the technical level of the product, so that the product has been developed in a healthy and orderly manner, it is necessary to develop the product standards of glass scale anti-corrosion coating. To this end, the National Technical Committee for The Standardization of Coatings and Pigments promptly organized and declared the chemical industry standards (HG/T 4336-2012 "Glass Scale Anticorrosion Coatings") to develop a project plan.1 Summary work process of standard formulation
In order to enable HG/T 4336-2012 "glass scale anticorrosion coating" to fully reflect the views of enterprises, reflect its advanced, reasonable, and better promote the technological progress of products, invited some representative enterprises to participate in the development of the standard. In order to ensure the standard level and consider the impact and reputation of the standard after publication, all invited enterprises have management norms, already have a considerable production scale and market share, with a good social image and other conditions, and should be the courage to assume social responsibility, in the industry can lead technological progress, product quality to a higher level of the backbone of enterprises. Participating in the standard-setting units are: CNOOC Changzhou Coating Chemical Research Institute Co., Ltd., China Coating Chemical (Shanghai) Co., Ltd. In order to make the revision of the standards smoothly, CNOOC Changzhou Coatings and Chemical Research Institute Co., Ltd., the main drafting unit of the standards, on the basis of consulting a large number of relevant information at home and abroad, reference to domestic and foreign standards, especially the technical requirements of domestic and related production enterprises, prepared a draft standard and work programme. In November 2010, the Standards Working Group held its first working meeting to discuss the draft standards, identify standard-setting principles, project settings, pilot methods, some project indicators and validation of pilot arrangements. In accordance with the requirements of the meeting, the working group member units provided 14 samples for validation testing by CNOOC Changzhou Coatings and Chemical Research Institute Co., Ltd.2 Principles of standard-setting
The main principles of this standard-setting work are: The new standard should reflect the reality of the quality of glass scale coating products in China, combined with the actual technical level of the product, fully reflect the requirements of advanced, scientific and applicable, to develop practical, reflect the excellent performance of the product industry standards, with a view to better regulating the market and promoting technological progress of the product.3 Scope of Application
This standard specifies the classification, requirements, test methods, inspection rules and markings, packaging and storage of glass scale anticorrosive coating products. This standard is applicable to thick slurry-type anti-corrosion coatings made of epoxy resin or other resins as the main film-forming substance, thin sheet-like glass scales for the bone material and other pigments
, etc. Broadly on the glass scale anticorrosion coating covers glass scale lining glue, taking into account the particularity of glass scale lining glue and the current HG/T 3797-2005 "glass scale lining glue" standard, so this standard range does not include glass scale lining glue.
4 product classification
glass scale coating can be classified by resin type, scale diameter size, viscosity of the coating, solid content, coating thickness. Taking into account the difference between the performance of epoxy glass scale anticorrosion coating and other types of resin glass scale corrosion coating performance, this standard divides the product into epoxy and other categories by resin type.5 Standard project settings, technical indicators of the determination of the
of this standard project set specifically as follows: the status of the container, coating appearance, non-volatile, drying time, adhesion (pulling method), wear resistance, acid resistance, alkaline resistance, glass scales qualitative, salt spray resistance, chlorine ion permeability and other 11 items.
about the content of glass scales, glass scale dosing has a range: 5% to 40% ( Quality score, same between between. When the quality score of glass scales in < increased by 30%, the impermeability of the coating increased with the increase of scale content. At 30%, the anti-permeability is strongest, and when the mass score >35%, the anti-permeability of the coating decreases with the increase of the scale content. Excessive scales will cause the disorderly accumulation of scales in the coating, so that the inside of the coating formed gaps, pores and other defects, affecting the tightness of the coating; If the amount of glass scales is insufficient, it is difficult to form a bridge between the scales, overlapping arrangement, then the impermeability of the coating will be reduced. In addition, if the glass scales are not added properly, the surface treatment or the selection of the joint agent is not right, the performance of the coating or coating can be reduced. For the glass scales to join the way, surface treatment or the choice of conjugate agent is correct, through a variety of electro-mirrors to observe the final curing into the film of glass scales in the arrangement of glass scales in the coating, test the chlorine ion permeability of the coating film, water vapor permeability and test the anti-corrosion properties of the coating, but also through the analysis of the final development of the glass scale coating in the container status, such as mucous size, whether easy to sink, whether easy to disperse the process. The content of glass scales in the coating is generally 20% to 40% better, higher than 40% easy to produce precipitation lumps, coating bubble rate increased, construction difficulties, corrosion resistance has decreased. Glass scale coating construction is simple, can be brushed, roller coating and high-pressure airless spray. Surface treatment must be carried out before coating, after oil blasting, blasting pills for derusting and coarse treatment.
5. 1 The technical requirements of the relevant enterprises
the main technical requirements of the relevant enterprises referenced by the relevant enterprises are found in Tables 1 and 2.
of enterprise 1 has no requirement for scales. The specification of enterprise 2 is to quantify scales. Enterprise 1 and enterprise 2 mainly for liquid-resistant media to do the specification, enterprise 1 on the water vapor penetration rate special provisions, enterprise 2 on the glass scale qualitative and quantitative norms.
5. 2 Verification Test Data Statistics
All validation tests were completed in June 2011, and the qualitative method of glass scales, the immersion test for different solution concentrations resistant to acidity and alkalineness, the anti-chloride ion permeability and wear resistance test were determined, on this basis, the main drafting unit determined the standard control items and indicators, completed the draft for comments, and verified the test data in Table 3.
the formulation of this standard refers to the following 5 standards, of which CECS 73:1995 "Xylene-type unsaturated polyester resin anti-corrosion engineering technical regulations", HG/T 2640-1994 "glass scale lining construction technical conditions" is mainly for the glass scale construction technical requirements and inspection and acceptance methods to standardize. HG/T 2641-2009 "Medium-alkali Glass Scales", HG/T3797-2005 "Glass Scales Lined With Glue" and Japanese industry standard JISK6940-1998 "Lined with glass sheet ethylene esters" Resin film 3 standards are mainly for raw materials with glass scales developed standards, this standard is for epoxy resin or other resins as the main film-forming substances, thin glass scales for the bone, add other pigments, such as thick slurry-type anti-corrosion coating standards, with different emphasis.
in this study mainly refer to the technical requirements of the relevant production enterprises, as well as in recent years, the National Paint Quality Supervision and Inspection Center to test the results of the product.
3 Items and indicators identified by the standards
items and indicators identified by the standards are set out in table 4.
6 test methods
the latest version of the test methods used in this standard. For the current domestic market part of the production enterprises to ordinary anti-corrosion paint posing as anti-corrosion paint containing glass scales this situation, this standard set a "glass scale qualitative" project, in order to fundamentally put an end to the phenomenon of fish mixed beads. At the same time, the glass scale anti-corrosion coating for marine engineering requires the testing of "anti-chloride ion permeability", fully reflecting the requirements of advanced, scientific and applicable, with a view to better regulating the market and promoting the technological progress of products. Among them, the test method of "the qualitative of glass scales" is further improved on the basis of the methods in the standard of HG/T 3797-2005 "glass scale lining glue". The product is used in marine engineering anti-chloride ion permeability test according to JTJ 275-2000 appendix C. 2 Regulations.7 Conclusion
On the basis of reference to a large number of domestic and foreign literature, the 14 enterprises of glass scale coatings were verified and tested, through extensive consultation, and finally formed HG/T 4336-2012 "glass scale anti-corrosion coatings." This standard is applicable to thick slurry-type anti-corrosion coatings with epoxy resin or other resins as the main film-forming substances and thin sheet glass scales as the bone. Glass scale coatings can be brushed, rolled and sprayed with high pressure and airless.