China Silicone Industry Development Prospects
🕙 2023-08-08 👆
There are more than ten large silicone professional companies in the world, and the production scale of methyl chlorosilane is getting larger and larger. Various silicone oils and secondary processed products, silicone rubber, silicone resin, silane coupling agent, silane surfactant are widely used in various industrial sectors. There are more than 5000 kinds of silicone product varieties and specifications, and the output and sales are increasing day by day. In the past 30 years, the growth rate of silicone industrial products has remained at 8% to 15%, far exceeding the growth rate of the general national economy. At present, the application of silicone in China has been very wide, the number and variety continue to grow, and the application field continues to expand, China has become the most potential market for silicone products.
Silicone rubber (English name: Silicone rubber), thermal vulcanization type (high temperature vulcanized silica gel HTV), room temperature vulcanization type (RTV), including room temperature vulcanization type and polycondensation reaction type and addition reaction type. High temperature silicone rubber is mainly used in the manufacture of various silicone rubber products, while room temperature silicone rubber is mainly used as a bonding agent, potting material or mold. The amount of hot vulcanization type is the largest, and the hot vulcanization type is divided into methyl silicone rubber (MQ), methyl vinyl silicone rubber (VMQ, the amount and product grade are the most), methyl vinyl phenyl silicone rubber PVMQ (low temperature resistance, radiation resistance), and other rubber, fluorine silicone rubber.
(A) : hot vulcanized silicone rubber
Due to the different industrial structure of various countries and regions, the high-rise structure of silicone is not the same, such as the United States silicone rubber accounted for 25 ~ 30% of the silicone market, Europe accounted for about 40%, Japan is more than 50%, of which nearly half of the hot vulcanized silicone rubber, China's silicone rubber accounted for a larger proportion, about 60%. In China, hot vulcanized silicone rubber is mainly used in electronic and electrical industry, office automation equipment and automotive industry, with the development of the national economy, the demand for hot vulcanized silicone rubber is growing at a rate of not less than 20% per year. Hot vulcanized silicone rubber production technology is complex, the product added value is high, in the world silicone market, its sales share accounts for about 10%, sales as high as 30 ~ 40%. The use of hot vulcanized silicone rubber can be roughly divided into extrusion molding products 35%, molded products 30%, wire and cable with 30%, coating materials with 5%, the consumption growth rate of 4 ~ 6%. In developed countries, the production scale and production technology of hot vulcanized silicone rubber raw rubber and rubber mixing have reached a higher level, as early as the early 1960s, the United States DowCorning company has a thousand tons of continuous polymerization device. In China, the earliest units engaged in the research and production of hot vulcanized silicone rubber are mainly Chenguang Chemical Research Institute and Jihua Company Research Institute, the first set of production equipment was built in 1960, the production scale is 5t/a. Up to now, the country has built more than 40 sets of raw rubber production equipment, with a total production capacity of nearly 80,000 tons. However, domestic silicone rubber manufacturers generally have problems such as low production efficiency, imperfect supporting technology, and less production of high-grade rubber mixes. According to incomplete statistics, in 2003, the production of hot vulcanized silicone rubber in China was more than 40,000 tons, and the actual consumption of China's rubber in that year was nearly 100,000 tons, and most of the high-quality rubber rely on imports.
At present, the consumption of silicone rubber rubber in China exceeds 10% of the world consumption, and the fastest growing silicon rubber application field is the production of conductive keys (keypads). The production plant is concentrated in Shenzhen, Xiamen, Nantong and other areas, and the key glue has become the largest user of hot vulcanized silicone rubber; Silicone rubber insulator and lightning arrester is instead of porcelain, FRP insulator, lightning arrester of the third generation of products, can be used in harsh climate environment, now foreign countries have been used in a large number of power transmission and transformation system, China has begun to use in coastal developed areas, the market prospects are very broad; The amount of automotive sealant made of silicone rubber in China amounts to tens of thousands of tons, of which thermal vulcanized silicone rubber is about 3,000 tons, and with the improvement of automobile grade, the amount of silicone rubber will increase significantly; In addition, silicone rubber in power cables, nuclear power plants, ships and other control cables, internal wiring of electronic machines, electric motors, color TV leads have good application prospects. In the civilian area, the nipple of the nursing bottle made of hot vulcanized silicone rubber, the plug of the hot water bottle, the pressure cooker gasket and the hose of the food vending machine have been widely used, and some raw rubber and rubber have been exported to foreign countries, such as the Chenguang Chemical Research Institute's nipple with rubber for several consecutive years exported to Iran, marking that China's silicone rubber products have entered the international market. In the field of modern medicine, silicone rubber has obtained a very wide range of important uses, such as the manufacture of silicone rubber anti-noise earplugs, silicone rubber fetal head suction device, artificial blood vessels, eardrum repair pieces, artificial trachea, artificial lung, artificial bone, silicone rubber duodenal tube, etc., the effect is very ideal.
(B) The status of room temperature vulcanized silicone rubber (RTV)
RTV is mainly used as bonding sealant, potting material and mold. The largest type of sealant used in the construction and decoration market (commonly known as "glass glue") is mainly used for bonding sealing requirements of new building forms such as glass curtain walls and high-rise buildings. In developed countries, the amount of silicone sealants has mostly maintained an annual growth rate of more than 10% in recent years. According to statistics, China's consumption of silicone sealant in 2000 reached more than 50,000 tons, and is growing at an average annual rate of 20%-30%.
In recent years, with the improvement of technical level and the expansion of market demand, the production of silicone sealant has developed rapidly, and many enterprises have invested in building factories or expanding the scale, and have formed two major silicone sealant production bases in Zhejiang and Guangdong. With the technological progress of the silicone industry, the quality of domestic silicone structural adhesive has been greatly improved, coupled with the price of domestic structural adhesive is much lower than that of imported glue, making domestic rubber has an absolute advantage in the performance-price ratio. On the other hand, domestic manufacturers supply timely, and can provide users with fast and thoughtful service, domestic brands in the past few years, the use of good results, won more and more users, the market share of domestic structural adhesive has risen from 10% a few years ago to more than 50%.
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Next: Operation analysis of silicone rubber insulators
Operation analysis of silicone rubber insulators
Different types of silicone rubber insulators have different roles, and the structural height and creepage distance are also different. Silicone rubber insulators are mainly used in substations. They have good hydrophobicity, aging resistance, leakage marking resistance and electrical erosion resistance, high tensile strength and bending strength, high mechanical strength, good impact resistance, shock resistance and anti-brittle performance. Light weight, easy installation and maintenance, the installation size of the upper and lower ends is the same as the installation size of the corresponding porcelain pillar insulator, and can be used interchangeably.
Composite high-voltage silicone rubber insulators have been widely used in the renovation of the two networks of the power Supply Bureau in the early period of Inner Mongolia in recent years because of their convenient installation, knock resistance, low cost, good insulation performance, corrosion resistance and pollution resistance. However, due to the process defects of silicone rubber insulators in the production process, the problem of the insulator being broken down in operation has been caused. Dongguan silica gel
It can be concluded from the analysis that although the silicone rubber insulator is tested before installation, it can not guarantee the safe operation of the equipment. Because the production of ionized carbon is formed after a long period of charged operation. This also reminds the majority of operating personnel, in the equipment maintenance work, must strictly implement the safety work procedures, when working on high-voltage equipment, must perform safety organization measures, safety technical measures before they can work, especially should do a good job of power failure, electricity inspection, installation of the ground line operating procedures.
The silicone rubber insulator of the fuse was dissected and analyzed. The black free carbonization caused by all discharge in the hollow in the middle of the silicone rubber insulator column was thought to be caused by the lax seal at the top of the terminal post of the silicone rubber insulator and the leakage of rainwater. After the test of several groups, there were no signs of leakage and the tightness was very good, which proved that the two conductive breakdown had nothing to do with rain erosion. Therefore, the organization of high voltage technical personnel for analysis, that is, silicone rubber insulator insulation hollow barrel inside, by the interference of strong electric field destroyed the dielectric balance in the air, resulting in discharge breakdown, this is the manufacturer in the manufacturing, testing engineering, the silicone rubber column made hollow. However, the central space is not treated as a vacuum, so that the residual air under the action of strong electric field force, after a long time of ionization, forming a conductive film on the hollow surface, that is, with the long running time and the increase of current, the ionized carbon encounters strong lightning current and overvoltage, which destroys the balance, and finally causes the breakdown of the insulator.
At the same time, it was also found that the metal oxide arrester produced by some manufacturers also has the low reliability of silicone rubber insulators, which is easy to cause insulation breakdown, resulting in the destruction of silicone rubber insulation. Therefore, the same measures are taken to gradually rotate the products of the same model, the same batch and the same manufacturer in the transformation process of the two network, avoiding the fault problem that is difficult to be eliminated after the single-phase grounding of the line. At the same time, we should strengthen the safety training of high voltage equipment, especially the power outage work, improve the safety awareness of all staff, and ensure the safety of power supply enterprises, which is to ensure the efficiency.
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