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A water-based polyurethane, polyurethane technology, applied in the field of polymer materials, can solve problems such as difficulty in introducing sulfonic acid groups
Active Publication Date: 2015-02-11
SHANGHAI SISHENG POLYMER MATERIAL
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However, it is very difficult to prepare water-based polyurethane with...
Method used
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Embodiment 1
[0052] Water-based polyurethane comprises the following components by weight percentage:
[0059] The preparation method is as follows: using the prepolymer mixing method, first add polyester polyols containing sulfonate groups, polyester polyols containing highly branched chain structures, dimethylol propionic acid, and N-methylpyrrolidone according to the formula In the reaction kettle, add isophorone diisocyanate (IPDI) and dicy...
Embodiment 2
[0062] Water-based polyurethane comprises the following components by weight percentage:
[0069] The preparation method is: using the acetone method, first add polyester polyols containing sulfonate groups, polyester polyols containing highly branched chain structures, dimethylol propionic acid, and acetone into the reaction kettle accord...
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Abstract
The invention relates to preparation of waterborne polyurethane with the solid content of 60%. The waterborne polyurethane comprises the following components in parts by weight: 58-62 parts by weight of polyurethane, 0-6 parts by weight of an organic solvent, 30-40 parts by weight of deionized water, 1-3 parts by weight of an organic amine chain extender, and a proper amount of a pH value regulator. The preparation has the advantage that the high-solid-content waterborne polyurethane with the solid content of 60% is prepared through adopting of a specially-designed composite polyester polyol and a specially-designed composite isocyanate monomer. The composite polyester polyol comprises the following components in parts by weight: 20-40 parts by weight of a polyester polyol containing a sulfonate group, and 60-80 parts by weight of a polyester polyol having a highly branched structure. The composite isocyanate monomer comprises the following components in parts by weight: 20-70 parts by weight of isophorone diisocyanate (IPDI), and 30-80 parts by weight of dicyclohexyl methane diisocyanate (HMDI).
Description
technical field [0001] The invention relates to the field of polymer materials, in particular to a preparation method of water-based polyurethane with a solid content as high as 60%. Background technique [0002] Water-based polyurethane has the advantages of non-combustibility, no pollution to the environment, and energy saving. It has developed considerably at home and abroad, and its application fields are becoming wider and wider. [0003] Water-based polyurethane essentially has the excellent characteristics of solvent-based polyurethane, but its solid content is usually low, and domestic products are mostly 20%-40%, which limits its application in many fields. This is mainly due to the influence of the following factors: (1) The latent heat of evaporation of water is much higher than that of solvents, and the energy consumption during construction is higher; (2) The surface tension of water is three times that of commonly used solvents, and the wetting of the substrate...
Claims
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