http://zh.wikipedia.org/zh-hk/% E8% 81% 9A% E6% B0% A8% E9% 85% AF polyurethane (English: Polyureth

http://zh.wikipedia.org/zh-hk/% E8% 81% 9A% E6% B0% A8% E9% 85% AF polyurethane (English: Polyurethane, abbreviated fun foam as PU) refers to the main chain containing carbamate characteristics of a class of polymer ester unit. Such polymer materials are widely used in adhesives, coatings, low-speed tires, washers, car mats and other industrial fields. fun foam In the areas of daily life are used to manufacture fun foam a variety fun foam of polyurethane foam and plastic foam. Also used in the manufacture of polyurethane condom (rubber condoms for people allergic to apply) and medical equipment fun foam research and development was originally polyurethane cooperation by the Otto Bayer and his colleagues in 1937 IG.Farben experiments fun foam in Leverkusen, Germany chamber begins. Their application by the addition polymerization of principle experiments, the use of liquid isocyanate and a liquid polyether or polyester glycol fun foam has been found to produce a polyolefin different from, and then condensed to form a new plastic --- polyurethane plastics. New polyester monomer mixture also from patent Wallace fun foam Carothers has been made. Initially, the application is limited to fibers and flexible foams. Followed by World War II affected their development (only a small range during the PU for air seats), until 1952 began isocyanates can be purchased fun foam commercially. 1954 started with toluene diisocyanate (TDI) and polyols for the production of flexible polyester polyurethane fun foam foam commercial FIG. This foam (initially called imitation Swiss cheese inventors) of the invention, thanks to which water was added to the reaction fun foam system, these materials are used in the production of rigid foams, adhesives and elastomers. Linear fibers are from hexamethylene diisocyanate (HDI) and 1,4 - butanediol, the reaction (BDO) of. The first commercial production of polyether polyols, poly (tetramethylene ether) glycol by polymerization of tetrahydrofuran Dupont in 1956. 1967, a urethane-modified polyisocyanate produced by rigid foam, the low-density insulation material produced exhibits better thermal stability and flame retardancy. Also in the 1960s, automotive interior safety components such as dashboards and door panels started using semi-rigid thermoplastic foam filling. From the early 1980s, pore water blown flexible polyurethane foam gasket models are used in automotive and tire sealing panel air filter. Since then, rising energy prices, and reduced requirements for use in automotive PVC growing polyurethane market fun foam share is increasing. Due to the expensive prices of raw materials to reduce the weight member, such as a metal cap and the filter housing and the reduction is compensated. fun foam Polyurethane elastomers and polyurethane foam filled high unfilled hot oil is now being used to filter them. Production of polyurethane foams (including foam rubber), the small amount to be added to the reaction mixture of volatile substances, called bubbling agent. These simple polyurethane material gives excellent insulation properties. The early 1990s, in order to reduce the impact on the ozone layer, the Montreal fun foam Protocol to limit the use of part of the chlorine bubbling agents. Such as trichlorofluoromethane (CFC-11). Other alkyl halides, such as chlorofluorocarbons, 1,1 - dichloro-1 - difluoroethane (HCFC-141b) were classified as greenhouse gases in 1994 IPPC Directive and the 1997 EU Gas Directive volatile organic substances being phased out . By the late 1990s, although there are some developing countries the use of halogen-containing blowing agents, North America and Europe has been increasing use of carbon dioxide, pentane, 1,1,1,2 - tetrafluoroethane (HFC-134a ), 1,1,1,3,3 - pentafluoropropane (HFC-245fa) as blowing agents. Based on existing technology and polyether polyurethane spray ammonia chemical theory, spray polyurethane elastic material has been rapid development in the 1990s. Their quick response and is relatively insensitive to moisture makes them the preferred characteristics of the paint coating of large projects. As a secondary safety enclosure, manholes and channel coatings, tank lining. After proper primer and surface treatment of concrete and steel has good adhesion. In the same period, a new two-component polyurethane polyurea and polyurethane elastomer blends technology has been applied to the construction site of the load bed liner Such small trucks and other transport cargo tank coating technology to create a durable, resistant to metal composite fun foam friction material. Thermoplastic metal lined make up deficiencies in areas prone to corrosion and brittleness. January 9, 2010 4:27 PM
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Before, Twitter has been popular for the World Cup ready to announce the image tag, new functionali

Before, Twitter has been popular for the World Cup ready to announce the image tag, new functionality can be "teams have i the right country have i the right code" have i the right information (such as # BRA) backend have i the right join flag pictures. Meanwhile, Twitter has improved platform for the World Cup, such as Twitter can be based on a new algorithm to the fans push the timeline; while Google Maps Street View service are also available in 12 of Brazil's have i the right World Cup stadium and comprehensive perspective of the indexing service. And over the years, veteran sports brand Adidas has always have i the right been a top official sponsor of the World Cup, has been one of the most important football field quietly new technological innovations, and this is the football field itself.
The official World Cup ball's name is Brazuca (samba glory), as early as 2013 has been announced, and the test used in many competitions. Brazuca employed bladder and tire technology have i the right with the ball before the 2012 European have i the right Cup "Tango 12" and the 2013 Confederations Cup "Cafusa" as well as the European Cup official ball used in tire technology bladder and the ball exactly. However Brazuca spherical structure using the latest innovative technology, using the same cross-shaped spherical six pieces forming a surface structure different from the past, so that football has a unique symmetry, a better field for the game ball, touch ball, stability and aerodynamics. Thus a good solution to South Africa 2010 World Cup ball "Jabulani" (celebrate) have i the right the surface is too smooth to be complaining about the players and issues in the air, the flight path "is not the law," the.
On France's World Cup, Adidas Tricolore first use of a layered composite have i the right foam technology significantly improves the durability of football.
World Cup Adidas Brazuca (Samba glory) is currently the most advanced of a company Adidas soccer products. It is once again pushing the limits, the six epidermal mosaic, called the history of the roundest football, which makes brazuca ball faster, more accurate trajectory. Sphere friction particles been redesigned from the origin, diamond, strip into a square, arranged in wavy curves, reaching enhancements coefficient of friction, enhanced ball arc. Adidas Brazuca passed the 30 teams and more than 600 professional players worldwide testing from 10 countries on three continents, in speed and accuracy on the run, to get a high rating. The Adidas Brazuca exactly at the World Cup will have what kind of performance, we are very wait and see. - Adidas official catalog
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2002 works with polyurethane foam to create a streamlined sofa, jagged appearance, enough for two o

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Building insulation materials used in a wide variety of building insulation paper which was the most common use of thermal insulation materials, inorganic materials have expanded perlite, aerated concrete, rock wool, glass wool and other organic materials are polystyrene foam, polyurethane foam, etc.. These materials epac bulle are the advantages and disadvantages of thermal insulation performance, mainly by the thermal conductivity of the insulating material of paper level (indicator of its thermal conductivity) epac bulle of the decision. Thermally conductive materials more difficult (ie, smaller thermal conductivity), its thermal epac bulle insulation properties will be better. Generally speaking, the common characteristics of thermal insulation materials are lightweight, loose, porous or fibrous form, its interior is not blocking the flow of air to the heat conduction. Which inorganic materials are non-combustible, wide operating temperature, good chemical epac bulle resistance and other characteristics, organic materials have high strength, low water absorption, better impermeability and other characteristics. Commonly used in insulation materials, epac bulle thermal conductivity of expanded perlite, rock wool, glass wool, polystyrene foam, polyurethane foam and other materials are relatively small, although there are differences in the level, but the difference is not great, belong efficient insulation materials, but no load-bearing function; thermal insulation properties of aerated concrete is better than ordinary concrete brick and other building materials, but lower than the more efficient insulation material. Because of aerated concrete is cement, lime, quartz sand, fly ash, slag and blowing agents such as aluminum, by high pressure or atmospheric steam car insulation made of paper support, greater epac bulle density, dry density of 300 per cubic meter about -700 kg, can use industrial waste, there is a certain load-bearing ability, single masonry walls, both insulation and load-bearing role. Expanded perlite perlite particles made by roasting expansion in our country due to abundant sources of raw materials, the production process is relatively simple, great production, epac bulle prices cheaper. Granular perlite, epac bulle lightweight, bulk density of about 50-150 kg per cubic meter, easily dispersed by the wind, low moisture absorption, but easy to absorb water, damp insulation effect is greatly reduced. Availability of cement, lime or sodium silicate plaster or stir dubbed into plate, tube watts, but its performance is less than loose insulation material, some added water repellent or add asphalt with water-resistant, moisture-proof function. Rockwool is basalt, andesite and other minerals melted by injection or centrifugation method fibroblasts, then add into board adhesives, carpets, strip, epac bulle tube shell and other products, the bulk density of 80-200 kg per cubic meter, good heat resistance, the general temperature of 350 , especially for furnaces and pipe insulation. Under load, the bulk density increased, decreased insulation properties. During transportation and storage to avoid the rain flooding. Glass wool is to silica sand, limestone, quartz and other raw materials for melting flame, centrifugation or blowing into the legal system. 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High-strength hard, non-absorbent, easily deformed, using a wide temperature range, the adhesive can be used with other materials, easy foam construction, epac bulle can be directly pouring foam, such as for infusion sealing effect is very good. In addition, there is a foil insulation materials, aluminum foil and kraft paper line after bonding with a composite made of corrugated sheet metal, aluminum can also be molded pieces can be multi-layered set as mezzanine wall or roof, light body, moisture, heat, cold performance are good.
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Heat pump water heater (5)