Polyurethane-acrylate water dispersion resin and its preparation
An acrylate and dispersibility technology, applied in the field of polyurethane-acrylate water dispersible resin and its preparation, can solve the problems of increasing the content of volatile organic compounds, cumbersome process of solvent recovery, increasing cost, etc. The effect of polluting the environment and saving costs
Active Publication Date: 2006-05-24
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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Problems solved by technology
However, the disadvantage is that more organic solvents are used to reduce the viscosity of the resin when synthesizing polyurethane prepolymers, which not only increases the cost, but also leads to an increase in the content of volatile organic compounds (VOC)
Even if the solvent is removed by vacuum distillation, the process is cumbersome and involves problems such as solvent recovery.
In addition, what is prepared by the above method is a pure polyurethane aqueous dispersion, and the cost of using it as a base material is relatively high
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0022] The present invention will be further described in detail below in conjunction with the examples, but not limited thereto. The parts in the examples are all parts by weight.
[0023] 1. Preparation of low molecular weight polyurethane prepolymer
[0024] 1. See Table 1 for the formula
[0025]
[0026] 2. Process
[0027] In a clean and dry reaction flask equipped with a thermometer, a stirring device, a condenser, and a nitrogen tube, under the protection of a nitrogen atmosphere, according to the formula amount in Table 1, add the vinyl monomers and polyvinyl monomers that can form nuclei through free radical polymerization in Example 1. Isocyanates, polymer diols, low molecular weight polyols and carboxyl-containing diols, and catalysts are added, the temperature is slowly raised to 80°C, and the temperature is kept for 5 hours. The hydroxyl value of the sample is less than 2mgKOH / g, and the methacrylate ( Some ethylenic monomers) and the like are low-mo...
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Abstract
The invention relates to a polyurethane-acrylate water-dispersible resin and its preparation. The resin particles use polyurethane as the shell and acrylate as the core, with a solid content of 30-40 percent and no free emulsifier and organic solvent. The preparation of the resin is to prepare a polyurethane prepolymer containing carboxyl groups under the condition of using the nucleated ethylenic monomer as the medium, and then neutralize and disperse it in water to form a polyurethane prepolymer equivalent to a polymer emulsifier. After chain extension, polymerizable ethylenic monomers are added, and the water-dispersible resin with core-shell structure is formed by free radical polymerization in the presence of an initiator. The resin is stable in storage, has excellent low-temperature film-forming properties, adhesion, flexibility, water resistance, etc., has low VOC content, and is suitable for cost performance. Can be used for paper, fabric, leather, wood, plastic, metal, glass and concrete surface coating.
Description
technical field [0001] The invention relates to a polyurethane-acrylate water-dispersible resin and its preparation. Background technique [0002] Polyacrylate emulsion and polyurethane aqueous dispersion are the two most widely used water-based resins, and have been widely used as base materials for water-based coatings, adhesives and inks. But when one of them is used alone as the base material, its performance and cost of use are still unsatisfactory. When the two resins are compounded as the base material by the physical blending method, there are problems such as poor compatibility and no obvious improvement in low-temperature film-forming properties. In addition, the earliest method to disperse the polyurethane prepolymer in water is to use a large amount of surfactant, but the storage stability of the polyurethane aqueous dispersion prepared by this method is poor, and the water resistance of the coating film after film formation is also relatively low. Difference. ...
Claims
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IPC IPC(8): C08L75/04C08L33/04C08G18/10C08F2/44
Inventor 孔志元张保利殷武何庆迪史立平朱柯
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST