Polyurethane Adhesive is an important product category in the synthetic adhesive industry and new polyurethane material industry, and is widely used in various fields of the national economy. In the last two years, the production scale and technology of polyurethane adhesives in China have developed rapidly, mainly in the following areas: Continuous bulk polyurethane resins for footwear Solid polyurethane adhesives for domestic footwear manufacturing There are more than 100 manufacturers in Guangdong, Fujian and economically developed regions More than a dozen large-scale "three-funded" enterprises, of which the largest companies such as Nanguang, Bo Li and other companies have annual output of more than 10,000 tons. These companies mainly use Germany, Spain, the United States and other imported resins to dissolve, formula modification and production of supporting primer. In recent years, many units have been working hard to develop this technology. Among them, Luoyang Jiming Company and Nanjing Rubber Factory, which rely on the Dawning Chemical Research Institute as their technology, have made rapid progress. In addition, some enterprises in Jinan, Tianjin, Henan, Zhejiang and other places are ready to launch production facilities.
One-component moisture-curable polyurethane sealants There are two main types of adhesives. One is an elastic sealant for construction, automotive and mechanical instruments; the other is a foam sealant, which is mainly used for sealing between walls and doors such as doors and windows, and sealing through holes in pipelines, insulation of pipes, installation and maintenance of refrigeration equipment, etc. .
A one-part, moisture-curable polyurethane foam sealant is a polyether or polyester prepolymer filled with an aerosol and a physical foaming agent. When injected into a gap that has been wetted and needs to be filled, it resembles a foamy hair. Bubbles form bubbles while curing with water as a crosslinking agent. Germany, the United States, and the Netherlands have already introduced such products into China, and Germany has also invested in factories in the Heqing Industrial Zone in Pudong, Shanghai. The Dawning Chemical Research Institute has now built a production line of 500,000 cans per year. Its product performance has reached the level of similar foreign products and has been placed in the market. In addition, Jiangsu Chemical Research Institute and Jilin Chaolong Chemical Co., Ltd. have also successfully developed such products.
In general, although China's polyurethane adhesive industry has achieved great development in terms of scale and technology, there is still a small gap compared with foreign countries. The main manifestations are: more than 95% of the shoe Polyurethane Resin used depends on imports, several domestic self-developed devices are relatively small, and the equipment and technology are relatively backward. The product performance, especially the stability of batches of products, is still not up to standard. To foreign countries, special adhesives (such as compound film polyurethane adhesives for cooking bags), structural adhesives, reactive hot melt adhesives, water-based adhesives, etc. are in the stage of development or pilot production of small devices. There are no large number of commercial products on the market yet, and imported products are still on the market. Mainly. In addition, there is a shortage of raw materials and additives, especially special raw materials and specialty additives. Synthetic, rubber blending, construction equipment and machinery, etc. also have a large gap with foreign countries.
According to the prediction of experts, the demand for polyurethane adhesives in China will reach 183,000 tons in 2005 (about 57,000 tons after solvent deduction). Based on the 103,000 tons in 1998, the average annual growth rate is about 10%. At that time, about 120,000 tons of plastic for shoes, about 20,000 tons of composite film glue, about 30,000 tons of general-purpose glue, about 10,000 tons of sealant, and about 0.3 million tons of structural glue and special glue. According to this demand forecast, it is suggested that the industry development policy is to pay equal attention to the introduction of technologies and self-developed technologies, to speed up the process of localization and large-scale production of bulk raw materials, resins, and major imported rubber; and to further increase the variety of general-purpose adhesives and laminating adhesives. , To improve the overall performance; focus on research and development of high value-added structural adhesives, special adhesives and non-organic solvent-based polyurethane adhesives adapted to environmental protection, safety and health requirements, to strengthen the supporting special raw materials, additives, process equipment and construction equipment and other research and development.
The proposed "10th Five-Year Plan" development goal is: By 2005, the localization rate of the major imported rubber species for imported bulk resin will increase from the current 5% to about 50%; and the development and improvement of the production of TPU resin by the continuous bulk method and Large-scale process technology represented by complete sets of one-component polyurethane sealant, such as vacuum double-planetary mixer changer, research and development of main structural adhesives and special glues with independent intellectual property rights, which are equivalent to the currently imported varieties, The overall level of polyurethane adhesive in China has reached the advanced level in the late 1990s and 2000. At the same time, through industrial policy orientation and market competition, a relatively reasonable industrial structure focusing on a small number of large-scale, high-tech companies will be formed.
To achieve this goal, it is proposed that the main contents of the “Tenth Five-Year Plan” development are as follows: 1. Based on the original small-scale self-developed technology, the introduction of foreign equipment or the use of domestic equipment to build several 2,000 tons/year scale continuous bulk TPU raw materials Resin production line. The supporting technology development includes the main equipment and its precision measurement system; perfect underwater pelleting, anti-adhesive edge post-processing system; process control technology; and the series of products whose performance reaches the level of similar foreign products.
2. Based on the original introduction technology and small-scale self-developed technology, build a single- and two-component polyurethane sealant production line with a certain scale, and the supporting technologies include the production of single-component vacuum-dual planet stirrer cans. Polyurethane sealant production equipment improvements.
3. Research and development of polyurethane adhesives for composite films used in cooking bags. The product performance has reached the level of similar foreign products and an appropriate scale of production equipment has been established.
Fourth, to complete the research and development of polyisocyanate crosslinking curing agents with low free isocyanate content, and to establish a large-scale production device.
Fifth, develop and complete water-based polyurethane adhesives, reactive hot-melt adhesives, and other research and development, and establish a corresponding scale of production equipment.
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