Preparation method and applications of hydrophilically modified polyisocyanate curing agent for waterborne polyurethane
A polyisocyanate, water-based polyurethane technology, applied in the direction of adhesive additives, polymer adhesive additives, etc., can solve the problems of affecting performance, violent reaction, etc., to achieve good water dispersibility or water solubility, low viscosity, reducing direct effect of contact
Active Publication Date: 2015-07-15
ZHEJIANG HUABAO INK
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Problems solved by technology
However, in the mixing of two-component water-based polyurethane, due to the side reaction between isocyanate and water, and the reaction is relatively violent, the reaction degree of this side reaction directly affects the final material or glue during the film-forming process of two-component polyurethane. Membrane properties
Method used
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Experimental program
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Effect test
Embodiment Construction
[0032] Preparation method of hydrophilic modified polyisocyanate curing agent for waterborne polyurethane of the present invention Example 1. Preparation of PEG homopolymer modified polyisocyanate curing agent: under the protection of nitrogen, add it in the reactor according to mass fraction Vacuum-dried 100 parts of single-ended hydroxyl PEG with molecular weight of 1000, 25 parts of diphenylmethane diisocyanate (MDI), 0.1 part of stannous octoate, and 150 parts of toluene, wherein the molar ratio of MDI to PEG is 1:1, stir, Raise the temperature to 80°C, and measure the NCO content every 30 minutes after reacting for 1 hour. The NCO content is tested according to the HG / T2409-92 standard. When the NCO content is constant, the reaction is stopped, the solvent is evaporated under reduced pressure, cooled to room temperature, and the material is discharged.
[0033] Preparation of water-based polyurethane polyol component: In order to test the curing effect of hydrophilic modifie...
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Abstract
The invention belongs to the technical field of chemical adhesives, and discloses a preparation method of a hydrophilically modified polyisocyanate curing agent for waterborne polyurethane as well as applications of the curing agent. The preparation process comprises the following steps: under the protection of nitrogen, polyethylene glycol, diisocyanate, catalysts and organic solvents are successively added into a reactor, stirred, and heated for reaction; then dihydroxyl-terminated hydrophobic polymer glycol is added for reaction; and finally polyisocyanates and more catalysts are added for reaction for 1 hour, the content of NCO is measured every 30 minutes, the reaction is ceased when the content of NCO becomes constant, the solvents are evaporated under reduced pressure, and the mixture is cooled to room temperature, so that products of the curing agent are obtained, and the applications of the obtained curing agent in rubber films are achieved. The provided polyisocyanates hydrophilically modified by two amphiphilic copolymers are higher in curing efficiency, can improve the mechanical properties and the bond strength of a curing film, and can reduce the use of the curing agent under the same conditions.
Description
Technical field [0001] The invention belongs to the technical field of chemical adhesives, relates to a preparation method of a hydrophilic modified polyisocyanate curing agent suitable for two-component, water-based polyurethane adhesives, and also relates to the application of the polyisocyanate curing agent. Background technique [0002] Waterborne polyurethane is a new type of polyurethane system in which water replaces organic solvents as the dispersion medium. It uses water as solvent, is pollution-free, safe and reliable, has low viscosity, is easy to construct, has excellent mechanical properties, has good compatibility, and is easy to modify. Waterborne polyurethane can be widely used in adhesives, coatings, inks, fabric coatings and finishing agents. In addition, because water-based polyurethane is safe and pollution-free, and has excellent low temperature resistance, fatigue resistance, flexibility, high bonding strength and transparency, it is also one of the ideal ad...
Claims
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IPC IPC(8): C08G18/48C08G18/42C08G18/44C08G18/62C09J11/08
Inventor 陶利国
Owner ZHEJIANG HUABAO INK