第1个回答 2010-06-05
Water-borne polyurethane (PU) due in use process preparation and use less organic solvent, products of volatile organic compounds (VOC) content is low, the environmental impact, developing very rapidly. But the water-borne polyurethane resin, compared with pu still exist many shortcomings, such as membrane gloss, film for a long time, water resistant weathering and expensive, etc. Therefore necessary to appropriate modification of waterborne polyurethane, improve the comprehensive performance, expand the scope of application.
In toluene diisocyanate (TDI), polyether polyols (PPG220), dimethylolpropionic acid (DMPA) as raw material, and then some synthetic PU with acrylic monomers on the emulsion polymerization of acrylic modified modification of waterborne polyurethane emulsion (WPUA). Through a series of modified synthetic latex, discusses its appearance, latex coated membrane stability, viscosity, hardness, raw material usage and the processing conditions on the performance of the product on the synthesis of waterborne acrylic polyurethane emulsion formulation and process of the best material conditions.
Research shows that the temperature gets together for 60 degrees, by time 300min, DMPA content 8%, crosslinking agent for 1%, TMP content and degree to 90% for 30 degrees Celsius, and temperature, the emulsion and the coating performance is the best.
第2个回答 2010-06-05
翻译如下：
Water-borne polyurethane (PU) due in use process preparation and use less organic solvent, products of volatile organic compounds (VOC) content is low, the environmental impact, developing very rapidly. But the water-borne polyurethane resin, compared with pu still exist many shortcomings, such as membrane gloss, film for a long time, water resistant weathering and expensive, etc. Therefore necessary to appropriate modification of waterborne polyurethane, improve the comprehensive performance, expand the scope of application.
In toluene diisocyanate (TDI), polyether polyols (PPG220), dimethylolpropionic acid (DMPA) as raw material, and then some synthetic PU with acrylic monomers on the emulsion polymerization of acrylic modified modification of waterborne polyurethane emulsion (WPUA). Through a series of modified synthetic latex, discusses its appearance, latex coated membrane stability, viscosity, hardness, raw material usage and the processing conditions on the performance of the product on the synthesis of waterborne acrylic polyurethane emulsion formulation and process of the best material conditions.
Research shows that the temperature gets together for 60 degrees, by time 300min, DMPA content 8%, crosslinking agent for 1%, TMP content and degree to 90% for 30 degrees Celsius, and temperature, the emulsion and the coating performance is the best.
第3个回答 2010-06-05
Polyurethane (PU) because the process of preparation and use of less organic solvent, the product of volatile organic compounds (VOC) content is low, less environmental impact and develop very rapidly.
第4个回答 2010-06-05
water-based polyurethane seldom use organic solvent in the process of preparation and usage. with lower content of volatile organic contaminant. less bad effect to the natural environment, so PU develop fastly. however, much of disadvantages will be showed when compare PU with solvent polyurethane, for instance,bad gloss of film formation, long time of film formation ,bad resistence to water and wheather, high cost and so on. so it is necessary to change its properties,enhance its comprehensive performance and expand its range of application.
in this article, will use TDI 'PPG220 'DMPA as the raw matetial to
compose moisture disintegration PU., and then, make WPUA by emulsion polymerization to the acrylic monomer. by the process of composing wpua, discuss what infuluence its appearance, density,stability,rigidity of film,raw material quantity and technological conditions may cause. we will find the best raw material and tech condition for composing the WPUA.
research shows:
under the condition as follows: prepolymer temprature at 60·C, prepolymer time is 300 min, content of DMPA at 8%, content of crosslinking agent TMP at 8%, and degrees temperature at 30℃, we can get the best WPUA with best performance of painting film.
第5个回答 2010-06-05
好多人都是机器翻译，注意辨认。
As organic solvent is less used during preparation and use of Water Borne Polyurethane, PU product is low in VOC(volatile organic compounds),with little impact on the environment ,which has grown rapidly in recent years. In contrast with PU ,However,Solvent Polyurethane still have many shortcomings,such as deficient gloss film,slower film formation,weak in water proof and weather resistance,fancy price and so on.
In toluene diisocyanate (TDI), polyether polyols (PPG220), dimethylolpropionic acid (DMPA) as raw material, and then some synthetic PU with acrylic monomers on the emulsion polymerization of acrylic modified modification of waterborne polyurethane emulsion (WPUA). Through a series of modified synthetic latex, discusses its appearance, latex coated membrane stability, viscosity, hardness, raw material usage and the processing conditions on the performance of the product on the synthesis of waterborne acrylic polyurethane emulsion formulation and process of the best material conditions.
Research shows that the temperature gets together for 60 degrees, by time 300min, DMPA content 8%, crosslinking agent for 1%, TMP content and degree to 90% for 30 degrees Celsius, and temperature, the emulsion and the coating performance is the best.