Following in 2006 the low relative molecular mass ("relative molecular mass", hereinafter referred to as the molecular weight) polyisobutylene prices soared and often out of stock, the 2007 medium molecular weight polyisobutylene also rose in price, and supply was in short supply. This verifies that the China Petroleum and Chemical Industry Association had predicted that the domestic consumption of polyisobutylene has been rising year after year, and the increase in demand for insulating glass special sealing materials and chewing gum base has contributed to this.
With the promotion and application of plastic steel windows, hollow glass has penetrated into ordinary residential areas, and the development is very rapid. The application prospects in the domestic market are broad. Polyisobutylene can increase the flexibility and permeability of the product in the field of insulating glass sealant. Currently, the sealing structure of the insulating glass in the market is divided into a single seal and a double seal. Single-pass seal means that the insulating glass is sealed by a comfortable strip; Double-pass seal means that the hollow glass hits two glues; medium-molecular-weight polyisobutylene glue is used as the first sealant; and high-strength polysulfide rubber or silicone rubber is used for the second seal. glue. In any structure, medium-molecular polyisobutylene plays an important role due to its reliable water resistance and excellent sealing performance. Generally, the content of polyisobutylene in the sealant strip is about 20%, and the content in the first sealant in the double-passage seal structure may even reach 40% or more. At present, the domestic use of medium molecular weight polyisobutylene is mainly the products of BASF in Germany, ENEOS in Japan, Jihua, and Shunda. As the country's environmental protection requirements increase, the use of medium-molecular-weight polyisobutylene will gradually increase.
Polyisobutylene mixed with paraffin wax and resin can improve the quality of chewing gum, at the same time, the chewing gum can be made softer and more stable, maintain good hydrophobicity, and have excellent film properties. The food-grade medium-molecular-weight polyisobutylene used for chewing gum base can only be prepared using a boron trifluoride catalyst system. The medium-molecular-weight polyisobutylene prepared by this method not only has a clear and transparent appearance, but also has a high purity, and a reasonable process can be used. Make its quality meet medical and food grade requirements. At present, some domestic manufacturers use aluminum trichloride catalyst system to produce, due to the limitations of the catalytic system and technology used, the product purity is low, the molecular weight distribution is wide, the appearance is poor, can not reach the medical grade and food grade requirements, make the application range and The number is greatly affected. Therefore, the domestic medium molecular weight polyisobutylene used for chewing gum bases at present can only rely on imports, mainly using products of BASF of Germany and ENEOS of Japan. Food-grade medium-molecular-weight polyisobutylene is not yet produced domestically.
In addition, polyisobutylene can also be mixed with various adhesives (including pressure sensitive adhesives) to make food-grade adhesives; mixed with various paraffins and high-molecular polymers, used as release agents for packaging films, and also for food packaging. Food and food grade hot melt adhesives.
The domestic manufacturers capable of producing medium molecular weight polyisobutylene are the additive plant of Lanzhou Refining and Petrochemical General Plant, the chemical fiber plant of Daqing Petrochemical Plant, the Fine Chemicals Plant of Jilin Petrochemical Company and the Hangzhou Shunda Group Polymer Materials Co., Ltd. At present, Lanzhou Refining and Additives Factory T603 has stopped production; Jilin Petrochemical Company fine chemicals plant 500 tons / year of the pilot plant has also been discontinued due to aging equipment; Daqing Petrochemical Plant Chemical Fiber Plant has been discontinued, the device idle. Only Hangzhou Shunda Group Polymer Materials Co., Ltd. now produces and transforms 3,000 tons/year of low-molecular-weight polyisobutylene into medium-molecular-weight polyisobutylene through technological transformation, claiming that the production capacity will reach 10,000 tons/year, but industry insiders say its production capacity. Only up to 6,000 tons/year. The production process of the middle molecular weight polyisobutylene, which was jointly developed by Hangzhou Shunda Polymer Materials Co., Ltd. and the national key polymerization laboratory, and the use of boron trifluoride catalyst, has been successful and won the national invention patent. The invention has a simple production process and product quality. Good, low cost, safe use, high yield, etc. However, the medium molecular weight polyisobutylene products are still produced using the aluminum trichloride catalyst system. In addition, the newly-built 2,000 tons/year polyisobutylene plant of Jilin Petrochemical Company's Fine Chemicals Plant will be put into production in February 2008, using a boron trifluoride catalyst system.
The successful development and industrial application of the boron trifluoride catalyst system will surely further improve the quality of polyisobutylene products in China, expand the application areas and enhance the competitiveness of the international market, and gradually reduce the dependence on imported products. Vigorously developing medium-molecular-weight polyisobutylene products can not only meet domestic demand, but also upgrade the domestic polyisobutylene products and improve the comprehensive utilization level of MTBE and carbon four resources, which is of great significance.
With the promotion and application of plastic steel windows, hollow glass has penetrated into ordinary residential areas, and the development is very rapid. The application prospects in the domestic market are broad. Polyisobutylene can increase the flexibility and permeability of the product in the field of insulating glass sealant. Currently, the sealing structure of the insulating glass in the market is divided into a single seal and a double seal. Single-pass seal means that the insulating glass is sealed by a comfortable strip; Double-pass seal means that the hollow glass hits two glues; medium-molecular-weight polyisobutylene glue is used as the first sealant; and high-strength polysulfide rubber or silicone rubber is used for the second seal. glue. In any structure, medium-molecular polyisobutylene plays an important role due to its reliable water resistance and excellent sealing performance. Generally, the content of polyisobutylene in the sealant strip is about 20%, and the content in the first sealant in the double-passage seal structure may even reach 40% or more. At present, the domestic use of medium molecular weight polyisobutylene is mainly the products of BASF in Germany, ENEOS in Japan, Jihua, and Shunda. As the country's environmental protection requirements increase, the use of medium-molecular-weight polyisobutylene will gradually increase.
Polyisobutylene mixed with paraffin wax and resin can improve the quality of chewing gum, at the same time, the chewing gum can be made softer and more stable, maintain good hydrophobicity, and have excellent film properties. The food-grade medium-molecular-weight polyisobutylene used for chewing gum base can only be prepared using a boron trifluoride catalyst system. The medium-molecular-weight polyisobutylene prepared by this method not only has a clear and transparent appearance, but also has a high purity, and a reasonable process can be used. Make its quality meet medical and food grade requirements. At present, some domestic manufacturers use aluminum trichloride catalyst system to produce, due to the limitations of the catalytic system and technology used, the product purity is low, the molecular weight distribution is wide, the appearance is poor, can not reach the medical grade and food grade requirements, make the application range and The number is greatly affected. Therefore, the domestic medium molecular weight polyisobutylene used for chewing gum bases at present can only rely on imports, mainly using products of BASF of Germany and ENEOS of Japan. Food-grade medium-molecular-weight polyisobutylene is not yet produced domestically.
In addition, polyisobutylene can also be mixed with various adhesives (including pressure sensitive adhesives) to make food-grade adhesives; mixed with various paraffins and high-molecular polymers, used as release agents for packaging films, and also for food packaging. Food and food grade hot melt adhesives.
The domestic manufacturers capable of producing medium molecular weight polyisobutylene are the additive plant of Lanzhou Refining and Petrochemical General Plant, the chemical fiber plant of Daqing Petrochemical Plant, the Fine Chemicals Plant of Jilin Petrochemical Company and the Hangzhou Shunda Group Polymer Materials Co., Ltd. At present, Lanzhou Refining and Additives Factory T603 has stopped production; Jilin Petrochemical Company fine chemicals plant 500 tons / year of the pilot plant has also been discontinued due to aging equipment; Daqing Petrochemical Plant Chemical Fiber Plant has been discontinued, the device idle. Only Hangzhou Shunda Group Polymer Materials Co., Ltd. now produces and transforms 3,000 tons/year of low-molecular-weight polyisobutylene into medium-molecular-weight polyisobutylene through technological transformation, claiming that the production capacity will reach 10,000 tons/year, but industry insiders say its production capacity. Only up to 6,000 tons/year. The production process of the middle molecular weight polyisobutylene, which was jointly developed by Hangzhou Shunda Polymer Materials Co., Ltd. and the national key polymerization laboratory, and the use of boron trifluoride catalyst, has been successful and won the national invention patent. The invention has a simple production process and product quality. Good, low cost, safe use, high yield, etc. However, the medium molecular weight polyisobutylene products are still produced using the aluminum trichloride catalyst system. In addition, the newly-built 2,000 tons/year polyisobutylene plant of Jilin Petrochemical Company's Fine Chemicals Plant will be put into production in February 2008, using a boron trifluoride catalyst system.
The successful development and industrial application of the boron trifluoride catalyst system will surely further improve the quality of polyisobutylene products in China, expand the application areas and enhance the competitiveness of the international market, and gradually reduce the dependence on imported products. Vigorously developing medium-molecular-weight polyisobutylene products can not only meet domestic demand, but also upgrade the domestic polyisobutylene products and improve the comprehensive utilization level of MTBE and carbon four resources, which is of great significance.
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