外文翻譯-- 水性聚氨酯-文庫吧
2024-12-31 02:12 本頁面
【正文】 in these cases, the waterborne polyurethane main agent and posed of crosslinking agent they will twoponent system. 3. To the nature points hydrophilic groups According to polyurethane molecular side chain or main chain, namely whether it contains ion groups of polymer (from whether ionic norbornenetype homopolymers), can be divided into anionic waterborne polyurethane type, cationic of nonionic,. Contain anion and cation waterborne polyurethane (also called from waterborne polyurethane norbornenetype homopolymers type). 4. With polyurethane materials points According to the main oligomer polyols types can be divided into polyether type, polyester and polyolefin type etc, are refers to using polyether polyols, polyester polyols, like polybutadiene glycol as oligomer polyols waterborne polyurethane made. And polyether polyester, polyether like polybutadiene mixed with polyurethane isocyanate raw material points, can be divided into aromatic isocyanate type, aliphatic isocyanate type, fat alicyclic isocyanate type. According to the specific material also can be divided, such as TDI type, HDI type, etc. 5. According to the overall structure of the polyurethane resin division (1) by raw material and structure can be divided into polyurethane emulsion, vinyl polyurethane emulsion, much isocyanate emulsion, closing polyurethane emulsion. Polyurethane emulsion refers to the oligomer polyols and extender chain agent and diisocyanate as raw materials, usually methods of polyurethane dispersed in water preparation by the formation of the emulsion. Vinyl polyurethane emulsion generally refers to in vinyl resin emulsion aqueous or add isocyanate emulsion, is formed twoponent system. Many isocyanate emulsion containing hydrophilic groups refers to how isocyanate emulsified in water, or more isocyanate organic solution containing emulsifier dispersed in the water, but also the emulsion formed twoponent use namely match system, applicable period shorter. Closing isocyanate emulsion refers to molecule containing blocked isocyanate groups of polyurethane emulsion, is a stable singleponent system. In the preparation of polyurethane emulsion introduced when pany closed isocyanate group, also can be made into closed isocyanate groups for high content of emulsion, blending with other emulsion system, up crosslinking role, moisture volatilizes crosslinking after heating (2) polyurethane emulsion also can be divided for polyurethane emulsion and polyurethane emulsion, the latter urea means that the polyurethane dispersed in water and through water or 2 amine extender chain, formed the polyurethane emulsion, essentially generated by urea, but because prepolymerization body for more mon scattered legal system, the custom of polyurethane emulsion
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