Foam glue is incorporated into the polymer system and releases gas in a timely manner during the processing process , a type of additive that enables polymer materials to form micropores. According to the mechanism of gas formation, it is divided into physical Foam glueand chemistryFoam glue.
1. PhysicsFoam glue
PhysicsFoam glueThere are many types. Traditionally, chlorofluorocarbon compounds are mainly used. CFCS can destroy the ozone layer of the atmosphere. For more than ten years, domestic and foreign countries have been seeking and developing ideal alternative products. And basically three solutions have been formed. At present, HCFC-141b and HCFC-22 are mainly used as transition products in the production of PU flexible foam, but more ideal alternative substances should be HFC-245fa and HFC-365mfc. HFC-245fa is a good foam glue for refrigerators and freezersstyrofoam font>,HFC-365mfc Insulating material for construction. Western developed countries and regions have begun to restrict the use of HCFC-141b and HCFC-22. For example, the European Union, the United States, and Japan will ban them starting in 2004. Therefore, foreign companies have developed and large-scale production of HFC-245fa and HFC-365mfc. In October 2003, the chemical subsidiary of Japan Glass Company built an HFC-245fa device with an annual output of 5,000 tons. At the end of 2002, Solvay built an HFC-365mfc device in France with an annual output of 15,000 tons. In addition, some specific alternative compounds such as hydrofluoroether are still being developed abroad, which are still in the research and development stage. In terms of PU rigid foam, research shows that cyclopentane is widely used at home and abroad due to its superior physical properties, short demoulding time, excellent thermal insulation properties, and zero ozone depletion value (ODP). The PE/PS foam industry uses nitrogen, carbon dioxide, butane, etc. to replace the original CFCS.
ChinaCFCs substitution research has progressed rapidly. Currently, HCFC-141b and HCFC-22 are produced in large quantities, and hydrofluoroalkane has been developed by drawing on foreign development experienceFoam glueHFC-134a and HFC-152a, and research and development work on high-performance HFC-245fa and HFC-365mfc are also underway. Undertaken by Sinopec Beijing Research Institute of Chemical Industry“Cyclopentane product development”The project has passed the appraisal,Domestic Jilin Longshan Chemical Plant, Beijing Dongfang Chemical Plant, Nanjing Hongbaoli Co., Ltd., etc. have already We successfully built a cyclopentane production device and cooperated with many domestic refrigerator manufacturers to provide them with cyclopentane-type combined polyethers for use as foaming materials.
At present, China’s foam plastic industry still uses a large number of ozone-depleting CFCs products, only Foam glueFoam industryIn 1999, the consumption of CFC-11 reached 19,162 tons. Faced with such a severe situation, a lot of cooperation was carried out at home and abroad. By the end of 2000, China Polyurethane��Can be ADCFoam glue is mixed with fine powder of certain inert inorganic compounds , In addition, surfactants can be added to ADC products to produce highly dispersible products.
4. Foam-inhibiting type: dicarboxylic acids and their hydrazides, phenols, amines and tris Substances such as azoles can inhibit the decomposition of ADC, and the inhibitory effect is better when there is a metal ion activator. For example, add foam-inhibiting typefoaming gluematerials will produce uneven patterns due to differences in foaming effects, thus producing foam wallpaper and other interior decoration materials.
5. Composite type: The compound of ADC can combine Other additives with specific functions are mixed with ADC or several types of styrofoaming glue mixed with each other. At present, the development of plastic additives industry is the mainstream.
6. Foam glueMasterbatch: Like the development trend of other synthetic material additives, masterbatch has becomeFoam glueOne of the modification trends of ADC. Mixing ADC, foaming additives and polymers to obtain masterbatch can effectively solve problems such as dispersion and dust pollution. At present, there is no development in China. Overseas, such as foam glue Masterbatch manufacturerAmerichem Company is currently There are special ADC product series of Supercell brand available; Exocerol and other series launched by Henly Company of the United StatesFoam glue also appears in the form of masterbatch, such as Exocerol232 and LAB010 are endothermic/exothermic blends, and AO38 is an exothermic blend. Foam‘s mixture, etc.
Therefore, in the futureADCFoam rubberThe key is to learn from foreign experience and vigorously develop endothermic types , endothermic/exothermic type and pyrolysis type Foam glue varieties and passed Masterbatch and surface modification are reducedfoaming glue dust pollution, etc.
5. Styrofoam OBSH
Foam glueOBSH is plastic andRubberLow temperature commonly used in industryFoam glue, mainly composed of diphenyl It is obtained by reacting with hydrazine hydrate after sulfonation of ether. The advantage is that it has a low decomposition temperature and does not require the addition of decomposition aids. It is suitable for various synthetic materials. It has low toxicity and is suitable for packaging materials that come into contact with food. It has good electrical insulation properties and has a vulcanizing agent. andstyrofoamdual function; cells are fine and even. At present, a variety of OBSH modified series products have been developed abroad, such as N#3000, 5000, 100S, 100M and other OBSH modified products of Japan’s Yonghe Chemical. Our country has also conducted research and development on OBSH. Currently, Shanxi Chemical Industry Research Institute and Hangzhou Haihong Company have established small-scale production facilities. However, due to its relatively high price, its application is subject to certain restrictions.
Foam glueDPT, the chemical name is N,N’-di Nitrosopentamethylenetetramine,Mainly used as rubberFoam glue, it has high decomposition heat. Urea, urea derivatives, melamine, etc. are often added to prevent the generation of irritating odors. It is basically not used for plastic foaming. There are many domestic production companies and the consumption is not high.
Title of this article: Current status and research progress of foam rubber production
Source of this article: http://www.wellgo.com.cn/newb/information_2399.shtml
Agents andfoam glue Dual function; cells are fine and even. At present, a variety of OBSH modified series products have been developed abroad, such as N#3000, 5000, 100S, 100M and other OBSH modified products of Japan’s Yonghe Chemical. Our country has also conducted research and development on OBSH. Currently, Shanxi Chemical Industry Research Institute and Hangzhou Haihong Company have established small-scale production facilities. However, due to its relatively high price, its application is subject to certain restrictions.
Foam glueDPT, the chemical name is N,N’-di Nitrosopentamethylenetetramine,Mainly used as rubberFoam glue, it has high decomposition heat. Urea, urea derivatives, melamine, etc. are often added to prevent the generation of irritating odors. It is basically not used for plastic foaming. There are many domestic production companies and the consumption is not high.
Title of this article: Current status and research progress of foam rubber production
Source of this article: http://www.wellgo.com.cn/newb/information_2399.shtml
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