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The performance and development of China's synthetic adhesives in the packaging and printing industry

[China Packaging News] at present, there are more than 1500 adhesive production enterprises in China, with more than 3000 varieties. It has become one of the fastest growing key industries in the chemical industry in China. Synthetic adhesive has many characteristics, such as wide application, simple use, high economic benefit, rapid development and so on. With the development of economy and science and technology, it will be paid more and more attention by people and become a promising industry. In China, large-scale production began in 1958. In the 1980s, the development of adhesives reached a climax. However, the synthetic adhesive industry in developed countries in the world has entered a highly developed stage, with an average growth rate of about 3% in the 1990s and 19.5% in China. In 1998, the global sales volume of synthetic adhesives was about US $25billion, of which the United States accounted for about 35% of global sales, Western Europe for 25%, Japan for 15% and China for only 7%. The global consumption structure of synthetic adhesives is that the packaging industry accounts for 35%, the construction industry accounts for 25%, the wood processing industry accounts for 20%, and the automobile transportation industry accounts for 10%. When the machine is in the state of charging, it accounts for 10%

it can be seen from the application structure of adhesives that the packaging industry is the largest industry in the application of adhesives. It is widely distributed in various fields of the packaging industry, such as paper products, printing and decoration, plastics, etc. at the same time, with the development of the adhesive industry, the quality and grade of packaging products have been improved and the development of the packaging industry has been promoted

I. carton and carton use

the carton and carton production industry is the industry with the largest amount of adhesive in China. At present, there are about 15000 carton and carton production enterprises in China. When producing cartons and cartons at the beginning, foam alkali adhesive was used. As the foamed alkali adhesive is easy to return to moisture, efflorescence, low bonding strength, and the cartons and cartons bonded with it are easy to deform and change color, the use of foamed alkali adhesive was banned by the state as early as 1985, requiring the use of starch adhesive or other binding agents with the same effect

at present, except for the low-grade cartons which use foamed alkali adhesive, the automatic production lines of medium and high-grade cartons and cartons have all used starch adhesive or other adhesives with the same effect. Starch adhesive production technology has also been constantly updated and developed, from heating production in the 1980s to cold water production now; From the earliest colloid (liquid) to various types of solid rubber powder, the improvement of adhesive production technology has greatly facilitated the production of cartons and cartons, making the drying speed of cartons and cartons from more than 40 hours to more than 1 hour now, which can enter the next process. At first, starch adhesive was only used in the production of high-grade cartons, but now it can be used in the production of various grades of cartons with hollow pier height measurement. The progress of non coagulant starch adhesive technology has played a key role in the development of China's carton and carton industry

II. Packaging and printing

in order to achieve the purpose of beautifying the packaging, the packaging and printing materials should be covered with film. On the premise of not changing the original tone of the printing materials, the covering film can increase the gloss and make them more eye-catching, and can prevent moisture, dirt, wear, etc., so as to effectively protect the internal polymer surface material preparation technology. The national engineering laboratory is the key raw material (special monomer, auxiliary agent) of the national polymer surface materials High performance resins, polymer surface materials and the central layer of technological R & D and technological innovation. Adhesive for film covering and film covering industry are also developing continuously. Solvent based or lotion adhesives such as e-va, polyurethane, polyacrylate, rubber and polyester are usually used, while solvent based film covering adhesives are organic solvent based adhesives. The solvents used are generally toluene, ethyl acetate and solvent oil, accounting for more than 60% of the total adhesives. Therefore, during the operation, they not only pollute the environment and endanger the health of workers, It may also cause fire. With the attention paid to environmental protection at home and abroad, printing enterprises are urged to choose adhesives that can meet both quality requirements and environmental requirements

the water-based paper-plastic composite adhesive, with water as the medium, has the characteristics of strong adhesive force, non-toxic, odorless, non combustion, no three wastes and public hazards, safe use, high transparency and gloss. In addition, it is safe to use, no damage to workers' bodies and no pollution to the environment. Therefore, it is deeply welcomed by the printing industry. At present, it has been widely used in the fields of packaging printing, book printing and so on

III. pressure sensitive adhesive and pressure sensitive tape

the production and application of pressure sensitive adhesive and pressure sensitive tape have served nearly 9000 medical and health units, and have also made great progress. In 1996, China's market sales of adhesive tape reached 2.26 billion m2, most of which were packaging tapes (accounting for 2billion m2). Since the 1990s, the production technology of domestic pressure-sensitive adhesive has gradually developed in an all-round way. The United States, Japan and other countries have successively established wholly-owned or joint ventures in China, which has promoted the improvement of the technical level of pressure-sensitive adhesive products in China to a certain extent. For example, in the production of double-sided tape, pressure-sensitive adhesive and products with excellent performance can be prepared by using acrylate soft monomer solution copolymer resin and various cross-linking forms other than cross-linking agents; For another example, in the development of hot-melt pressure-sensitive adhesive products and radiation curing pressure-sensitive adhesive, foreign advanced technology has also been used for reference, and now many enterprises can produce it on a large scale

the development and production of high-performance special pressure-sensitive adhesives in China, such as protective tapes with high adhesive strength for automobiles, tapes with strong adhesive performance for lifting and reuse, and special tapes with high temperature resistance and high insulation, need to be further studied and improved

in addition to the above types of adhesives, other packaging adhesives in China, such as label label, paper plastic sealing adhesive, cigarette adhesive and paper tube adhesive, should also be constantly updated with the development of various production technologies

although China has made remarkable development in packaging adhesives in recent ten years, there is still a certain gap between China and the world advanced level in many aspects, mainly including: the variety and quality can not fully meet the requirements, and many varieties still need to be imported; The applied technology research can not catch up with the development requirements of new varieties; The production equipment is backward, and there are many low-level duplicate varieties. At present, there is no systematic national and industrial materials and testing means

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