Heavy anti-corrosion epoxy powder coatings are of a wide variety of character

China Coatings Online News Information

thermoso-solid heavy anti-corrosion epoxy powder coating, also known as fused epoxy powder, developed in the 1950s and 1960s, achieved industrial production for more than 30 years, after continuous development and improvement of this technology has matured, so far more than 105 km of pipelines have used fused epoxy powder. China's fusion epoxy powder technology started late, in the 1980s began to introduce and digest foreign advanced epoxy powder and technology, equipment. Globally, powder coatings now account for about 10% of industrial coatings, while powder coatings in Western Europe are the most mature, accounting for more than 15%. 8 per cent in 1995, 12 per cent in 2000, 17.5 per cent in 2005 and more than 20 per cent in 2010, second only to 23 per cent of water-based coatings. It is expected that in the next few years, engineering powder coatings will play an important role in the powder coating market because of their excellent properties. Some experts estimate that, according to the average rate of increase in China's paint production and sales in recent years, in 2006 China's paint industry grew at a rate of 10%, the annual demand for coatings reached more than 4 million tons. The market supply is slightly greater than the demand. Production growth will remain at around 8%, which can be gradually digested in the first two years of rapid development.
China's thermoso-solid powder coating production in 2002 reached 2.7 million tons, the first time over the United States and become the world's first production and consumption of thermo-solid powder coatings, over the past few years has maintained a growth rate of more than 25%, in 2005 output reached 5 million tons, accounting for 12.5% of industrial coatings. Product quality, performance, environmental indicators have also made great progress. International giants Aksu, DuPont, PPG Xuanwei, Romenhas and other large-scale paint companies are optimistic about China's powder coatings market, have expanded powder coatings business in China, domestic enterprises have also started, forming a stag-by-deer situation. In the future, China's powder coatings market will form four major demand. The fastest growing areas are the shipbuilding industry and the pipeline industry. The industry with the greatest demand is the automotive industry. The important application direction is thermal materials. Promising uses are architectural and outdoor facilities. In order to meet the needs of long-lasting corrosion protection such as heterogeneous components and pipes in heavy corrosion environments such as chemical industry, metallurgy, nuclear power, petroleum, natural gas, water transmission, etc., Zhang Lixin of the Institute of Metals of the Chinese Academy of Sciences, etc., developed SEBF fused combined epoxy coating, and SLF polymer composite epoxy coating two series of heavy corrosion protection coatings. SEBF molten combined epoxy powder coating is a thermo-solid single-part powder coating, which has the characteristics of wear resistance and strong binding force. SLF is a two-part solvent-free fast-curing polymer alloy coating with good physical and chemical properties.
In the early 1990s, Langfang Yanmei Company took the lead in introducing a heavy anti-corrosion series epoxy powder coating, filling the domestic blank, and successfully applied to China's major oil fields and Shaanxi, a Beijing natural gas pipeline, Shibei Xining a Lanzhou natural gas pipeline and other national key projects, and achieved significant economic and social benefits. At present, Daqing Qinglu Chemical Co., Ltd. Wu Xige, has developed and produced his own epoxy resin heavy anti-corrosion powder coating, applied to the Hangzhou Bay Bridge steel pipe pile anti-corrosion, western pipeline project, has achieved good results. According to
China Coatings Onlineexperts
introduced, China's heavy anti-corrosion powder coating special epoxy resin and curing agent has been domesticated, the use of phenolic resin phenolic hydroxymethyl and epoxy-based reactions to achieve epoxy resin change, phenolic curing agent because of similar structure with epoxy resin, so good compatible, the resulting tough coating corrosion resistance, far better than phenolic oxide oxide system. Therefore, the application is more extensive, PH-1 phenolic curing agent curing epoxy is mainly through phenolic hydroxyl and epoxy-based etheric reaction cross-linked into a membrane. Of course, mid-hydroxyl can also react with epoxy during curing. The reaction is extremely weak due to the space bit resistance effect and reaction activity. The catalysts are glycamines, methamphetamines, borates, etc. In general, methotrexate is more commonly used, and the addition produced by the reaction between the amino and epoxy groups on the mimi ring is equivalent to the catalytic effect of schoamine.
the use of steam pipes in the shipbuilding industry, drilling pipes in the petroleum industry, heat exchangers and reaction vessels in the chemical industry are mostly required at 120 to 150 degrees C, and a wide variety of chemical media are in contact. At high temperatures, these devices corrode much faster and more severely than at room temperature. High temperature corrosion-resistant Teflon coatings, polyphenyl sulfur ether coatings are not only expensive, but also high construction requirements, around 300 degrees C after multiple molding, in order to achieve the general powder coating once molding thickness. In addition, Teflon coatings have poor adhesion to metal equipment, and at negative pressure the coating breaks off the metal surface and clogs pipes. In the 1980s, a range of anti-corrosion powder coatings were developed abroad, such as the Plastic 200, plastic 300 to plastic 800 series of petroleum pipeline powder coatings developed by Baker Pipeline Services in the United States, with a maximum operating temperature of 150 degrees C.
Yu Zisen, 11th Research Institute of China Shipbuilding Industry Corporation, etc., developed NOX-1 high temperature strong anti-corrosion powder coating (hereinafter referred to as NOX-1) for the current situation of powder coatings at home and abroad. Mainly composed of 3 components: Shanghai Ship Technology Research Institute for the development of NOX-1 powder coating specially developed and produced high-performance thermoo-curing NOXE resin, the resin cured after the thermal deformation temperature of up to 279 degrees C, the first in China; The NOX-1's spraying process can be applied using conventional powder coatings, i.e. electrostational spraying, fluidized bed immersion and thermal spraying. Take thermal spraying as an example: chemical or blasting of the inner or outer walls of large industrial pipes or containers to remove oil or rust, preheat the treated equipment to 220 degrees C in an oven, spray NOX-1 powder coating on the surface of the preheated work piece, powder coating immediately melts on the surface of the hot pipe, Flow to form a continuous, smooth clip anti-corrosion coating, the thickness of the coating is controlled at 350±50 m, the sprayed work parts are placed in the oven, at 200 degrees C curing 30min, the coating becomes hard and dense, thermal deformation temperature of up to 273 degrees C, can withstand corrosion and damage of a variety of media.
SINCE 1993 NOX-1 powder coating, by the Shanghai chlor-alkali plant, Shanghai enamel reactor plant, Nantong pesticide plant, Puyang fan factory and other units tested for chemical pipelines, reactors, containers, heat exchangers, heat mixers, fan and other equipment corrosion prevention, achieved good results. And its non-toxic performance has also attracted the attention of food, pharmaceutical and other industrial anti-corrosion departments. The future development direction of functional thermosoenstic powder coatings will be the variety or function diversification of epoxy coatings. The direction of market demand in the next few years is actually the change or innovation of epoxy resin in the field of heavy corrosion protection. Mainly manifested in 7 aspects: heavy anti-corrosion powder coatings, including pipe-specific heavy anti-corrosion powder coatings, steel cable (cable) special heavy anti-corrosion powder coatings, rebar-specific heavy anti-corrosion powder coatings, UV-resistant heavy anti-corrosion powder coatings; Container-specific insulated powder coatings, F-grade (155 degrees C) insulated powder coatings α, high-gloss decorative powder coatings, mainly for automobiles and motorcycles, ultraviolet curing (W) powder coatings, mainly used in medium density plates, γ plastics, wood and other fields;
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