[China Aluminum Industry Network] The project that revised the chemical industry standard HG/T4104-2009 "water-based fluororesin coating" was approved by the National Standards Committee and officially entered the start-up phase.
The fluororesin coating has excellent durability, chemical resistance, and long-term excellent gloss and color retention properties. In addition to the traditional excellent performance of fluorine coatings, water-based fluororesin coatings have the advantage of being more environmentally friendly than solvent-based fluororesin coatings. With the increasingly stringent requirements of national environmental protection regulations on the content of volatile organic compounds, and the continuous improvement of China’s economic development and people’s living standards, it provides a broad space for the promotion and application of such high-grade coatings.
Water-based fluororesin coating is used as a high-grade coating for exterior surfaces of buildings. It has been used in China for nearly 10 years. Currently, water-based fluororesin coatings for metal surfaces have also emerged and are gradually applied. In 2009, China promulgated the chemical industry standard HG/T4104-2009 "Water-based fluororesin coating" for building water-based fluororesin coatings, which has been implemented for more than seven years and has reached the revised year. The standard has played an active role in guiding production, regulating the market, and protecting the interests of consumers. Due to the support of national policies, the construction of water-based fluororesin coatings has developed rapidly in recent years and is currently in a golden period of market cultivation.
With the development of production technology and detection technology, it is found that there are areas that need to be improved: 1. The scope of application of the standard: At present, there are only products that are suitable for coating on the exterior surfaces of buildings, and there are no requirements for products for metal surfaces. , is not conducive to the promotion and application of such products. 2. Classification of standard Chinese product classification: The current standard is divided into PVDF type; fluorine-containing acrylic type and FEVE type. Based on the current development of technology, the product category is not limited to the above, and other varieties with excellent performance have emerged. 3, the current standard of the three types of products only limits the fluorine content requirements, there is no other specific requirements, the degree of differentiation is not high 4, the current standard in combination with fluoride content indicators take into account the requirements of other projects, fluorine-containing acrylic properties Better than the theory. 5. Method for determination of fluorine content: Due to the development of water-based fluororesin synthesis technology, the method for determining fluorine content in the current standard, such as centrifugation, cannot effectively separate the resin from the coating. The method has a large error and is in urgent need of revision. 6. During the implementation of the current standard, the SPC has also received a number of opinions and suggestions related to this standard one after another. Therefore, HG/T4104-2009 has not been able to meet the current development of the technical level of water-based fluororesin coating. The standard was revised.
The revised HG/T4104 "Waterborne fluororesin coating" standard will apply to waterborne copolymer resins containing CF bonds. It is mainly used for the decoration and protection of the exterior surfaces of buildings and metal surfaces. The standard plan stipulates the requirements for product classification, classification, requirements, test methods, inspection rules and signs, packaging and storage of waterborne fluororesin coatings. Performance settings include fluoride content in the base material, low temperature stability, adhesion, alkali resistance, scrub resistance, water resistance, acid rain resistance, stain resistance, salt spray resistance, and resistance to artificial accelerated aging. And the corresponding product classification test methods, inspection rules, logo storage and other requirements.
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