1. Industrial production of epoxy resin abroad
The first manufacturing of bisphenol A epoxy resin abroad with industrial value was completed in 1947 by Devoe-Raynolds Company of the United States. It opened up the technical history of epichlorohydrin-bisphenol A resin. Industrial development began; at the same time, epoxy resin is considered to be a technological advancement superior to phenolic resin and polyester resin.
2. Domestic production of epoxy resin
The development of epoxy resin in my country began in 1956, and it was first successful in the laboratory in Shanghai and Shenyang. In 1958, Shanghai Resin Factory and Wuxi Resin Factory began industrial production successively. It has been 60 years since the industrial production of bisphenol A epoxy resin in my country, but the development was relatively slow before the 1980s. After the reform and opening up, with the rapid development of my country's economic construction, our country has rapidly developed into the world's largest epoxy resin production country and producer, and the world's largest epoxy resin consumer and market.
3. Industrial production of domestic epoxy resin supporting materials
The epoxy resin must cross-link the epoxy resin molecules into a macromolecular solid with a network structure under the action of the curing agent and its functional additives, in order to show the excellent performance of the epoxy resin. However, the production of curing agents in my country in the 1970s and 1980s could not meet the needs of application technology in terms of quality, performance or variety. To this end, our country’s applied technology researchers cooperate with relevant synthetic production enterprises to jointly develop new materials to meet the urgent need for new types of epoxy resins, curing agents and other supporting materials for scientific and technological development.
1. From June 11th to 13th, 1980, in Jiaxing City, Zhejiang Province, the appraisal meeting of "E-39-D Electrical Grade Epoxy Resin" was hosted by Zhejiang Petrochemical Department and passed the appraisal. E-39-D electrical grade epoxy resin was developed by Jiaxing Chemical Plant and put into industrial production.
2. From November 1st to 3rd, 1982, in Wenzhou City, Zhejiang Province, the appraisal meeting of "HK-021 Epoxy Liquid Anhydride Curing Agent" was passed under the auspices of Zhejiang Petrochemical Department. HK-021 liquid acid anhydride curing agent is developed and industrialized by Wenzhou Qingming Chemical Plant.
3. In October 1981, the “Electrical Grade Silicon Micropowder” technical appraisal meeting hosted by Zhejiang Science and Technology Commission passed the appraisal in Huzhou City, Zhejiang Province. Electrical grade silicon powder is developed by "Huzhou Silicon Powder Factory" and put into industrial production.
4. In May 1983, in Kunshan City, Jiangsu Province, the "T-31 modified amine curing agent" appraisal meeting hosted by the Jiangsu Science and Technology Commission passed the identification; "T-31 modified amine curing agent" is Kunshan, Jiangsu Auxiliary Factory and East China Institute of Chemical Technology were jointly developed and put into industrial production by Jiangsu Kunshan Auxiliary Factory. T-31 amine curing agent is a phenalkamine curing agent made of ethylenediamine, phenol, and formaldehyde through the Manzini reaction. It has completely changed the monomolecular fatty amine curing agent, which is volatile and toxic, irritating the skin and respiratory system, and harmful to the human body. At the same time, the operation time is short, the cured product is brittle, and the overall performance is poor.
4. The turning point in the development of my country's epoxy resin industrial production
The industrial production of epoxy resin in my country began in 1958, and it has been 60 years, but the industrialization of epoxy resin in the first 30 years has been relatively slow. After the reform and opening up, especially the epoxy resin plant of Yueyang Petrochemical General Plant introduced an epoxy resin plant with an annual output of 3,000 tons from Japan’s Dongdu Chemical Company in 1988, and the Wuxi Petrochemical General Plant introduced an annual output of 3,000 tons of epoxy resin from the German Barclay Company in 1989. After 3,000 tons of epoxy resin equipment, China's epoxy resin industry can develop rapidly.
1. In 1987, the epoxy resin plant of Yueyang Petrochemical General Plant in Yueyang City, Hunan Province introduced a high-purity epoxy resin plant with an annual output of 3,000 tons from Dongdu Chemical Co., Ltd., and was completed and put into operation in 1989. It is the first set of advanced epoxy resin production equipment introduced in my country.
2. In 1990, Wuxi Petrochemical Plant in Jiangsu Province introduced an electronic-grade epoxy resin plant with an annual output of 3,000 tons from the German Barclet Company and was put into operation.
5. Establishment of epoxy resin system concept
epoxy resin application technology is the concept of “epoxy resin system” by combining professional epoxy resin, curing agent, active dilution penalties, functional additives, fillers and other supporting formulas.
"Epoxy resin system" and "epoxy resin" are two different concepts. "Epoxy resin system" emphasizes the matching, professionalism, specificity and functionality of epoxy resin application technology materials; while "epoxy resin" is just a unity, versatility, universality, and general concept.
Because, although epoxy resin castables, potting materials, anti-corrosion coatings, structural adhesives, glass fiber reinforced composite materials and building structural adhesives have already appeared on the market as epoxy resin system products, few people have learned from the "system "To understand from the perspective of ", but only from the single approach of epoxy resin, curing agent and other auxiliary materials to develop new product development, which often delays the time to solve technical problems due to their own efforts.
"Epoxy resin system" is a holistic and systematic perspective, with special emphasis on the coordination and cooperation of other functional auxiliary materials such as epoxy resin, curing agent, toughening agent, reactive diluent, etc. The simultaneous research and development of oxy-resin formula combination materials have been realized, and combined with application technology, the speed of materials or products into the market has been accelerated. In the past few years, great progress has been made. The key to winning the competition with foreign products is that the adjustment and upgrading of China’s epoxy resin industry in recent years has begun to adapt to the needs of the international situation. The result of strengthening coordination and communication among scientific research, production, and business units in the system industry.
In recent years, our country has adopted multi-departmental and cross-system combination coordination and joint efforts in the long-stator epoxy resin supporting system and molding process technology of magnetic levitation trains; nuclear power generation epoxy resin supporting materials and application process technology; wind turbine blade ring Oxygen resin supporting system and molding process technology; epoxy resin filling supporting materials for high-speed railway slag-free plate structure track rails; and epoxy resin composite material systems without air gaps; epoxy resin supporting systems such as nano-level epoxy resin packaging materials are realized The localization has fully demonstrated the role and development of the "epoxy resin system".
It is important that the development of China's epoxy resin system is closely linked and interdependent with the technological progress of epoxy resin application technology; at the same time, they promote and promote each other. Therefore, the combination of epoxy resin, curing agent, toughening agent, diluent, filler, accelerator and coloring agent and the combination of the two major parts of epoxy resin application technology has formed an epoxy resin system. The epoxy resin formulation design is unique in the category of polymer synthetic materials according to the variability of application technology and the diversity of molding technology. The development practice and facts of my country's epoxy resin in the past 60 years have proved the truth: application technology has promoted the development of synthetic industry, and the development of synthetic industry has promoted the technological progress of application technology.
6. my country is a big epoxy resin country in the world, not a strong country yet
Since the industrial production of epoxy resin in my country in 1958, the development of application technology has made epoxy resin widely used, and the output has increased year by year; but before the 1980s, the development was slower and the quality was poor. After the reform and opening up, especially in the late 1980s, my country introduced advanced foreign production technology and process equipment. The quality of my country's epoxy resin reached the same level as abroad, and the production capacity and output increased significantly.
The annual output of epoxy resin in my country in 1986 was about 15,000 tons.
In 2013, my country's total epoxy resin production capacity reached 2.03 million tons. The world's total production capacity was 4.06 million tons, and my country accounted for about 50%.
In 2015, there were 6 companies with epoxy resin production capacity of more than 100,000 tons in my country, and the largest was 320,000 tons. In 2015, the average operating rate of my country's epoxy resin industry was about 60%.
In 2016, my country's epoxy resin production capacity was 2.25 million tons, the output was 1.13 million tons, and the capacity utilization rate was around 50%.
In 2016, the world's total epoxy resin production capacity was about 4.77 million tons per year. In recent years, global epoxy resin companies have been more active in mergers and investment activities. After a series of mergers and reorganizations, the top three epoxy resin companies in the world are currently : Dow Chemical, Taiwan Nanya Plastics, and Momentive Specialty Chemicals account for 15%, 12%, and 10% of global production capacity, respectively.
my country's epoxy resin production capacity is mainly distributed in Jiangsu, Anhui Huangshan, Shandong, Guangdong and other provinces and cities, among which large-scale installations in Jiangsu are concentrated, and the production capacity accounts for about 52% of the country. The Yangtze River Delta and the Pearl River Delta are the regions where the domestic epoxy resin demand market is most concentrated.
There is a phenomenon that needs attention. Although the production capacity of epoxy resins in China is growing rapidly, the varieties are single, and the production capacity of epoxy resins is mostly low-end products. Special products with high added value and special epoxy resins with higher technical content are still Mainly rely on imports. For example: In 2016, domestic epoxy resin imports were 240,000 tons, exports were 70,000 tons, net imports were 170,000 tons, apparent consumption was 1.3 million tons, and import dependence was above 10%.
At present, my country's epoxy resin industry presents a state of excess low-end products and insufficient high-end products. After 2007, China's epoxy resin industry began to expand its production capacity on a large scale, but the development of the entire industry was limited to pure growth in speed, scale, and quantity. It did not make a fuss about the improvement of quality, the upgrading of varieties, and technological progress. There is no unity. A large number of high value-added, high-tech epoxy resins still rely on imports, such as: high-purity electronic grade epoxy resin, high-purity radiation-resistant epoxy resin, high-purity flame-retardant epoxy resin, high-purity liquid crystal epoxy resin, high Purity multi-functional epoxy resin, etc., which seriously hinder the healthy development of China's epoxy resin industry and its application technology and market industry.
With the continuous maturity of my country's special epoxy resin production technology, it will certainly fill the gap in the domestic production of special epoxy resins and gradually replace imported products. The import volume of epoxy resin in my country will be reduced, and the domestic self-sufficiency rate will gradually rise.
7. Epoxy resin under Sino-US relations
From 2012 to 2017, the domestic epoxy resin production capacity has shown an increasing trend, with an average external dependence maintained at around 20%, mainly concentrated on the import of high-quality, special and special epoxy resins. The domestic epoxy resin industry has obvious overcapacity. With the increasing domestic environmental protection efforts, the impact of domestic factories' production restrictions and emission reductions is obvious. The overall start-up is low and the capacity utilization rate is low. In 2017, domestic epoxy resin was affected by environmental protection and other factors, as well as the two major raw materials soaring and the downstream demand is strong, the domestic market prices soared significantly, which led to an increase in foreign imports.
In 2017, domestic imports grew rapidly, up 16.74% from 2016. In 2017, domestic epoxy resin imports totaled 274,800 tons, of which Taiwan, South Korea, the United States and Germany ranked in the top four, while the United States' total imports of 33,000 tons ranked third. From January to February 2018, domestic imports totaled 44,800 tons, of which the U.S. imports 4,314.75 tons, accounting for 9.63% of imports. Therefore, overall, the impact of tariffs on epoxy resins is limited.