Synthetic adhesives have many characteristics, such as wide application, easy to use, high economic benefits, and rapid development. With the development of economy and the advancement of science and technology, it will love people's attention more and more, and become a very promising industry.
The production of adhesives in our country really began to take place on a large scale. It started in 1958. In the 1980s, the development of adhesives reached a climax. At present, China's adhesive production enterprises have reached more than 1500, more than 3000 varieties, has become one of the fastest growing key industries in China's chemical industry. The synthetic adhesive industry in developed countries of the world has entered a highly developed stage, with an average growth rate of about 3% in the 1990s and an average growth rate of 19.5% in China. In 1998, global sales of synthetic adhesives were about 25 billion US dollars, of which the United States accounted for about 35% of global sales, Western Europe accounted for 25%, Japan accounted for 15%, and China accounted for only 7%. The global consumption structure of synthetic adhesives is 35% for the packaging industry, 25% for the construction industry, 20% for the wood processing industry, 10% for the automobile transportation industry, and 10% for others.
As can be seen from the application structure of adhesives, the packaging industry is the largest industry for the application of adhesives. It is widely distributed in various fields of packaging industries such as paper products, printing and decorating, and plastics. At the same time, with the development of the adhesive industry, it has also improved the packaging products. Quality and grade have promoted the development of the packaging industry.
1. Adhesives for carton and carton
The carton and carton production industry is the industry with the largest amount of adhesives in China. At present, there are more than 15,000 carton and carton production enterprises in China. When initially producing carton and carton, bubble gum adhesive was used. Because the foam alkali adhesive is easy to regain moisture, pan-alkali, and has low bonding strength, the carton and carton bonded with it are easily deformed and discolored. Therefore, as early as 1985, the country had explicitly banned its use and requested to use starch adhesive. Mixture or other bonding agent with the same effect.
At present, except for the low-end boxes that use bubble gum adhesives, starch adhesives or other adhesives with the same effect have been used in the automatic production lines for medium and high-grade carton and carton. The production technology of starch adhesives has also been constantly updated and developed, from the heated production in the 1980s to the current cold water production; from the earliest colloid (liquid) to various types of solid rubber powder, the production technology of adhesives has been greatly improved It facilitates the production of carton and carton, and the drying speed of the carton and carton has been developed from more than 40 hours to more than 1 hour to enter the next process. Initially, starch adhesives were only used in the production of high-end carton, but now it can be used to produce various grades of carton. The advancement of non-coagulating starch glue technology has played a key role in the development of China's carton and carton industry.
Second, packaging and printing adhesives
With the improvement of people's living standards, there are higher requirements for packaging, especially sales packaging, such as the exquisite packaging we see for cigarettes, wine, medicine, cosmetics and so on. In order to achieve the purpose of beautifying the packaging, the packaging printed matter should be covered with a film. Without changing the original tone of the printed matter, the coating can increase the gloss and make it more dazzling, and it can prevent moisture, stains, and wear. , Thereby effectively protecting the inner layer. Adhesives for coating and coatings are also constantly developing, usually using solvent-based or emulsion-based adhesives such as E-VA, polyurethane, polyacrylate, rubber, polyester, and solvent-based The laminating adhesive is an organic solvent-based adhesive. The solvents used are generally toluene, ethyl acetate, solvent oil, etc., which account for more than 60% of the total adhesive. Therefore, it not only pollutes the environment and endangers the health of workers during the operation, but also may It caused a fire. With the emphasis on environmental protection at home and abroad, printing companies were encouraged to choose adhesives that could meet both quality requirements and environmental requirements.
Water-based paper-plastic composite adhesive uses water as a medium, with strong adhesion, non-toxic, odorless, non-flammable, no three waste pollution, safe use, high transparency and gloss, etc. In addition, it is safe to use and to the worker's body No damage and no pollution to the environment, so it is very popular in the printing industry. At present, it has been widely used in packaging printing, book printing and other fields.
3. Pressure-sensitive adhesive and pressure-sensitive adhesive tape
The production and application of pressure-sensitive adhesives and pressure-sensitive adhesive tapes have also been greatly developed recently. In 1996, China's market sold 2.26 billion m2 of adhesive tape, most of which was packaging tape (accounting for 2 billion m2). After entering the 1990s, the domestic production technology of pressure-sensitive adhesives has gradually developed toward a comprehensive direction. The United States, Japan and other countries have successively established wholly-owned or joint ventures in China, which has promoted the improvement of China's pressure-sensitive adhesive technology in certain procedures. For example, in the production of double-sided adhesive tapes, acrylate soft monomer solution copolymer resins have been used, and various cross-linking agents have been used to produce pressure-sensitive adhesives and products with excellent performance in the form of diplomatic relations; for example, in the development of hot melt In terms of pressure-sensitive adhesive products and radiation-curing pressure-sensitive adhesives, it also draws on advanced foreign technology, and now there are many enterprises that can produce on a large scale.
In the development and production of high-performance special pressure-sensitive adhesives in China, such as high adhesive strength protective tapes for automobiles, strong adhesion performance tapes for lifting, high temperature resistant and high-insulation special tapes, etc., further research needs to be strengthened and needs to be improved. In addition to the above types of adhesives, other packaging adhesives in China, such as label labels, paper-plastic sealing adhesives, cigarette adhesives, and paper tube adhesives, must also be continuously updated with the development requirements of various production technologies.
Despite the remarkable development of packaging adhesives in China in the past decade, there are still some gaps with the world's advanced level in many aspects, mainly: varieties and quality can not fully meet the requirements, many varieties still need to be imported; applied technology research work can not catch up New varieties development requirements; production equipment is backward, there are many low-level repetitive varieties, there is no systematic country, industry materials and testing methods.
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