Preparation method of enclosed type aromatic isocyanate aqueous dispersion
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An isocyanate and aromatic technology, which is applied in the field of preparation of blocked isocyanate aqueous dispersions, can solve the problems of poor stability of aromatic isocyanate aqueous dispersions, and achieve the effects of simplifying the bonding process, saving costs, and improving bonding performance
Inactive Publication Date: 2012-06-13
NORTHEAST FORESTRY UNIVERSITY
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[0005] The present invention solves the technical problem of poor stability in the existing preparation of aromat...
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specific Embodiment approach 1
[0020] Specific embodiment one: the preparation method of the blocked aromatic isocyanate aqueous dispersion, characterized in that the preparation method of the blocked aromatic isocyanate aqueous dispersion is realized by the method:
[0021] 1. Dry the polyol at 60~100℃;
[0022] 2. Add 0.5 to 1.5 mol of polyol and 0.2 to 0.8 mol of dimethylolpropionic acid (DMPA) to 10 to 250 mL of solvent A, stir for 10 to 60 minutes, and then pour in nitrogen at a flow rate of 1 to 5 mL / min for 15~ 45 minutes (the purpose is to remove the oxygen in the solution), then heat to 40~90℃, keep for 15~45 minutes;
[0023] 3. Then add 0.5-2mol aromatic isocyanate dropwise, the dropping rate is controlled at 2-5s / drop, and then react at 50-95℃ for 0.5-7 hours;
[0024] 4. Then add the blocking agent at 25~70℃, the amount of blocking agent is 1~1.5 times of the free isocyanate content;
[0025] 5. Add 0.5-2mol of triethylamine at 35~55℃, then add 10~500mL deionized water, emulsify at 30℃ for 2~5 hours, st...
specific Embodiment approach 2
[0027] Specific embodiment two: This embodiment is different from specific embodiment one in that the polyol in step one is polyester polyol or polyether polyol. The other steps and parameters are the same as in the first embodiment.
specific Embodiment approach 3
[0028] Specific embodiment three: this embodiment is different from specific embodiment one in that: the polyol in step one is polyoxypropylene glycol, polyoxyethylene glycol, polyethylene glycol, polyethylene adipate two Alcohol, polycaprolactone or poly 2,3-dimethyl-2,3-butanediol. The other steps and parameters are the same as in the first embodiment.
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Abstract
The invention belongs to the field of enclosed type aromatic isocyanate aqueous dispersion preparation, and provides a preparation method of an enclosed type aromatic isocyanate aqueous dispersion. The invention aims at solving a technical problem of poor stability of existing aromatic isocyanate aqueous dispersion preparation methods. The method provided by the invention comprises steps that: 1, polyhydric alcohol is dried by baking; 2, polyhydric alcohol and dimethylol propionic acid are added into a solvent, and are stirred; nitrogen is delivered into the solution; the solution is heated, and the temperature is maintained for 15-45min; 3, aromatic isocyanate is dropped into the solution; 4, a blocking agent is added to the solution; 5, triethanolamine is added to the solution, and deionized water is added to the solution; the solution is emulsified, and nitrogen delivering is stopped; 6, the solvent A is removed. The enclosed type aromatic isocyanate aqueous dispersion prepared by the invention can be directly used as a single-component environment-friendly adhesive and a paint in fields of aqueous adhesive and wooden lacquerware. The enclosed type aromatic isocyanate aqueous dispersion can also be prepared into a molding resin cross-linking curing agent and a molding resin auxiliary agent in fields such as enameled wire and fabric.
Description
Technical field [0001] The invention belongs to the field of preparation of blocked isocyanate water dispersions. Background technique [0002] Isocyanate compounds and their polymers have a wide range of applications due to their strong adhesion, high gloss, good corrosion resistance and abrasion resistance, and can be made into various materials or additives with excellent performance. Especially used as adhesives and coatings, it has become an important bonding agent due to its many advantages such as excellent bonding performance, no formaldehyde release, excellent water resistance and aging resistance, and strong adaptability to materials to be bonded. [0003] However, the isocyanate group is chemically active, easily reacts with water and active hydrogen-containing substances, and is very sensitive to moisture. As a result, the prepared isocyanate adhesive easily reacts with water vapor and makes storage difficult, especially in aqueous systems. The stability of the medium ...
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