What is the difference between PA and PU hose tube
Article : Ludun
Time : 2015-10-08
PV：
Polyurethane coating adhesive Polyurethane (PU)
Is called the pu polyurethane, the molecular structure of polymer compounds containing - NHCOO - unit, the unit composed of isocyanate and hydroxyl reaction, reaction is as follows: - N = C = O + HO ˉ - - NH - ˉ COO
In the 1970 s, the German Otto Bayer PU was synthesized in the first place.In 1950, before and after the PU as textile finishing agent in Europe, but most of the solvent products used for dry coating finishing.In the 1960 s, because of the people environmental protection consciousness enhancement and government laws and regulations of environmental protection, drainage PU coating arises at the historic moment.Since 70 s, the rapid development drainage PU coating, PU coated fabric has been widely used.Since the 80 s, the research and application of PU technology appeared a breakthrough progress.Compared with foreign, domestic research on PU textile finishing agent later.According to incomplete statistics, the domestic water system the scientific research, production unit of the PU is not much more than about 40 (), the annual output ten thousand tons, and most for leather finishing agent, used in textile finishing.
Polyurethane coating agent is the main future development types, its advantage lies in:
Soft and elastic coating;
Good coating strength and can be used for thin coating;
Porous coating, with moisture and ventilation performance;
Wear resistance, resistance to wet and dry cleaning.
Its defect is:
The high cost;
The climate resistance is poor;
In the water, heat, alkali hydrolysis.
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