On the development trend of adhesive application i

Talking about the development trend of adhesive application field in China

because adhesive can realize the connection of the same or different materials, there is no stress concentration at the joint, the bonding strength is high, and it is easy to realize the automatic operation of chemical combination, it is widely used in all fields of the national economy, and has become an indispensable chemical product for the development of the national economy. The rapid development of the national economy also provides a broad space for the development of the adhesive industry, so the adhesive industry in China has developed rapidly. According to the statistics of China Adhesive Industry Association, the annual average growth rates of the production and sales of adhesives and sealants in China from 2005 to 2009 reached 12.2% and 19.6% respectively, and it is predicted that the growth rate will remain high during the "12th Five Year Plan" period. The annual average growth rates of production and sales are 10% and 12% respectively, of which the growth rates of reactive adhesives are 12.5% and 14.9% respectively. In addition to the continuous and rapid growth of output and sales, the technical level of adhesives in China has also been continuously improved, and a large number of products reaching the advanced level at home and abroad have been developed, showing the development trend of products towards modified, reactive, multifunctional, nano type and other directions, and the application field towards new energy, energy conservation and environmental protection and other emerging industries

1. Glue used in the field of new energy

(1) glue used in wind power generation

due to the lack of global petrochemical energy resources, the utilization of renewable energy has been valued and supported by governments all over the world. As a very important renewable resource, wind energy has been used more and more, and its main form of utilization is wind power generation. In recent years, the global wind power industry has developed rapidly. According to the statistics of the Global Wind Energy Council and the wind energy professional committee of the China Renewable Energy Society, the annual average growth rate of the global new wind power installed capacity from 2005 to 2010 was 29.2%, and the annual average growth rate of China's new wind power installed capacity was 95.5%, which was much higher than the global average. According to the prediction of China Wind Power Development Report 2010, the cumulative installed capacity of wind power in China will reach 230million kW by 2020

the rapid development of China's wind power industry provides a huge market space for the application of epoxy structural adhesives and epoxy matrix resins for blades. Epoxy matrix resin is one of the main materials for producing blades and blade molds. Epoxy resin structural adhesive is used for bonding the upper and lower shells of wind turbine blades. At present, the vast majority of domestic wind turbines are 1.5MW models, and each unit requires three blades. The amount of epoxy structural adhesive for each blade is about 0.35 tons, and the amount of epoxy matrix resin is about 2 tons. If the cumulative installed capacity of wind power in China reaches 230million kW in 2020, the installed capacity of wind power needs to be increased by about 188million kW. The demand for epoxy structural adhesive and epoxy matrix resin is 131000 tons and 750000 tons respectively, and the output value is 6.5 billion and 26.25 billion respectively. Based on 16500mw of new installed capacity in China in 2010, the cumulative installed capacity will reach 230million kW in 2020, with an average annual growth rate of less than 5%, and the actual growth rate may be higher

since the service life of wind turbine blades is required to be more than 20 years, the requirements for epoxy structural adhesive and epoxy matrix resin are very high, which should have both good physical properties and good durability. Therefore, these products need to pass the internationally authoritative GL certification as well as the user's test and verification before formal application, with a high entry threshold. The development trend of wind turbines is towards oversize. 2.5MW and 3.0MW models have been successfully developed, and 5.0mw and 6.0mw models are also in the process of development, which will put forward higher or new requirements for structural adhesives and matrix resins for blades

(2) glue for solar power generation

solar energy is a clean, safe and reliable renewable energy. Compared with hydropower, nuclear power and other energy sources, the construction of solar power stations does not require high geographical location, and the time and cost are relatively low. It is also a renewable energy with great development prospects in the future. Countries all over the world are vigorously developing solar power generation. The annual average growth rate of global solar cell production in the past five years is%, and the average growth rate in the next few years will remain at%. According to the prediction of the European Joint Research Center, solar power generation will account for more than 10% of the world's total power supply by 2030. China's solar power generation started almost in 2000, but its development speed is very fast. The average growth rate from 2000 to 2010 was 143.6%. In 2010, the output of solar cells reached 8000mw, becoming the largest country in the world, accounting for about 50% of the world's total output

the adhesives used for solar cells are mainly epoxy structural adhesive, EVA adhesive film and silicone adhesive. Epoxy structural adhesive is used for cutting silicon wafers of solar cells, which requires high strength, stress and processability; EVA adhesive film is used for the assembly of solar cell modules. The glass panel of monocrystalline silicon battery is bonded with silicon wafer and back plate, or the glass panel of thin film battery is bonded with back film, which has high requirements for its strength, light transmittance, weather resistance and waterproof vapor permeability; Silicone adhesive is used for solar module frame sealing and junction box potting. It requires good weather resistance and waterproof vapor permeability for frame sealing, and good electrical performance and thermal conductivity for junction box potting. It is estimated that the amount of adhesive used in the field of solar cells in 2010 is 315 tons of epoxy structural adhesive (the output of silicon wafer is about 10GW), 56000 tons of EVA adhesive film and 12000 tons of silicone adhesive, with an output value of 85 million, 2.24 billion and 840 million respectively

because solar cells have high requirements for life and safety, adhesives used in solar energy need to pass the iec61215:2005 standard certification and UL certification of authoritative institutions. In addition, how to improve the transmittance of EVA adhesive film or use new adhesive film materials with higher transmittance to improve the conversion efficiency of solar cells, and how to use new sealant instead of silicone adhesive to improve the production efficiency of solar cells are all key research topics of adhesives for solar cells

2. Glue for energy conservation and environmental protection (1) glue for plastic packaging composites

Plastic packaging composites are plastic packaging materials that use adhesives to bond multi-layer films with different characteristics into a whole. The packaging materials formed by the composite of different film materials have the advantages of moisture-proof, light proof, cooking resistance, corrosion resistance, low cost, and are widely used in the packaging of all kinds of food, beverages, drugs, daily necessities and medical supplies. The market of plastic packaging composites in China is huge. The adhesive used for packaging materials is mainly polyurethane laminating adhesive. It is reported that the output in 2009 has reached 215000 tons, an increase of 26.5% over 2008. However, almost all the polyurethane laminating adhesives used at present are solvent based products, and there are problems such as solvent emission, energy consumption, solvent residue and safety hazards in the production, transportation and use process

the solvent-free polyurethane laminating adhesive is completely hydrolyzed and will be implemented in 2015, which solves the problems of the above solvent-based products and belongs to energy-saving and environmental protection products. Since the 1980s, developed countries such as Europe and the United States have begun to use solvent-free laminating adhesive in large quantities, and the amount of adhesive used in new composite production lines is almost solvent-free laminating adhesive. Solvent free compounding technology started late in China, and the proportion of solvent-free laminating adhesive in the total amount of laminating adhesive is still very low. In recent years, with the increasing attention paid by the state to environmental protection, safety and health, and the improvement of environmental protection, safety and health awareness of manufacturers and users, the application of solvent-free polyurethane laminating adhesive has significantly expanded, with an estimated consumption of 1100 tons in 2010, an increase of about 30% over 2009. With the improvement of the government's requirements for energy conservation and emission reduction, the newly implemented national standard gb/t limits the total amount of solvent residues in composite packaging materials. More and more users require products to comply with the 21fdacfr regulations of the U.S. Food and Drug Administration and the 2002/72/ec directive of the European Union. In addition, the localization of solvent-free composite equipment and adhesives has accelerated the promotion of solvent-free laminating adhesives, In the next few years, the market demand for solventless polyurethane laminating adhesive will grow faster and eventually completely replace solventless products

(2) automobile lightweight adhesive

China is a large automobile production and consumption country. From 2005 to 2010, the average annual growth rate of China's automobile sales reached 24.4%. In 2009, China's automobile production and sales both exceeded 13million, becoming the world's first automobile production and consumption country, and will maintain a growth rate of more than 10% in the next few years. China's rapid development in the automotive industry 6 With a sample recovery device, it is also facing increasing pressure from energy and environment. Therefore, automobile lightweight has been paid more and more attention and encouraged by the government, and has become the main direction of the development of China's automobile industry. With the advancement of automobile lightweight process, lightweight materials such as aluminum, magnesium, ceramics, plastics, glass fiber or carbon fiber composites are more and more used in automobiles. Most of these materials cannot use traditional connection processes such as welding and riveting, and need to be bonded with structural adhesives. At the same time, the increasing application of FRP parts in automobiles also increases the demand for matrix resin. According to the statistics of China Association of automobile industry, China's automobile output in 2010 was 18million, and the amount of automobile adhesive was about 157000 tons, of which the amount of structural adhesive was about 111000 tons. With the development of automobile lightweight technology, the growth rate of automobile structural adhesive consumption will be significantly higher than that of automobile production, which provides a broad space for the application of structural adhesive in the automotive field. Of course, automobile lightweight not only increases the demand for adhesives, but also puts forward higher requirements for adhesives, such as high bonding strength, good weather resistance and fatigue resistance of new engineering plastics and composites

(3) adhesive for energy-saving buildings

due to the fact that there are many FRP materials, the corresponding experimental data of any point on the curve can be found with the mouse; Advantages: if these standards are good, they include the designability, mechanical properties, decoration, light transmittance, heat insulation, sound insulation, electrical properties and chemical corrosion resistance of product standards. FRP materials are widely used in the construction industry, which can be used as load-bearing structures, auxiliary structures or decorative materials. They can reduce the self weight of buildings, improve the use function of buildings, reform architectural design, and accelerate the construction progress, It is very beneficial to reduce the project cost, improve economic benefits, energy conservation and environmental protection

the manufacture of FRP materials requires a large amount of epoxy matrix resin, and the application of FRP materials also requires a large amount of epoxy structural adhesive for bonding. It is estimated that the demand for epoxy building adhesive in 2010 is 12000 tons, and it is expected that the demand will reach 16000 tons in 2014, including 2800 tons of building reinforcement adhesive. In addition, with the application of other new designs and new composite materials in buildings, the demand for structural adhesives will continue to increase

(4) glue for water treatment equipment

water treatment is one of the key issues of environmental protection. Water treatment technology has received great attention. Ultrafiltration membrane water purification technology is a major innovative technology. Compared with other water treatment technologies, it has high treatment efficiency, good effect and low energy consumption. It is a new technology with both environmental protection and energy conservation. Ultrafiltration membrane water purification equipment is widely used in drinking water treatment, seawater desalination, sewage reuse, medicine, food, beverage, biology and other fields. The core technology of ultrafiltration membrane water purification equipment is the preparation of ultrafiltration membrane. In addition, the end sealing technology of ultrafiltration membrane filter element is also very critical. At present, the end sealing resin of ultrafiltration membrane water purification equipment is mainly epoxy resin, which requires