Method for preparing block cationic water-borne polyurethane iron (III) chelates

Abstract

The invention discloses a method for preparing block cationic water-borne polyurethane iron (III) chelates. The method comprises reacting diisocyanate with macromolecular dibasic alcohol, micromolecular dibasic alcohol and a hydrophilic chain extender, adding an end-capping reagent to obtain double bond end-capped polyurethane prepolymer, adding glycidyl methacrylate to carry out the copolymerization reaction, adding amino-containing 3-hydroxyl-4-pyridone derivatives to carry out the ring-opening reaction with epoxy groups, and performing covalent linkage to the two ends of polyurethane to obtain the block cationic water-borne polyurethane iron (III) chelates. The method avoids the side reaction between 3 hydroxyl groups and isocyanate, the reaction conditions are mild, the aftertreatment is simple, the obtained micromolecular chelates are located on side chains at the two ends of a chain of polyurethane, the content is adjustable (0.1-15wt%); and the obtained macromolecular chelates can be dissolved in water, acetone, butanone, N,N-dimethylformamide and dimethylsulfoxide.

Description

1. Technical field [0001] The invention relates to a preparation method of a block cationic waterborne polyurethane iron (III) chelate, belonging to the technical field of waterborne polyurethane materials. 2. Background technology [0002] At present, polymer iron chelates are attracting more and more attention, and polymer iron chelates are widely used in water treatment, pollution control, metal ion recovery, active packaging and analytical chemistry and other fields. Because kojic acid, maltol and other pyrone derivatives and 3-hydroxy-4-pyridone derivatives have good iron chelating ability, the raw materials are easy to get, and the price is cheap, so they are often used to synthesize high molecular weight iron chelate thing. [0003] The use of 1-(β-acryloylethyl)-3-hydroxyl-2-methyl- 4-(1H)-pyridone (AHMP), N,N-dimethylacrylamide, N,N'-vinylbisacrylamide yields a polymer containing 3-hydroxy-4-pyridones, which Polymers are insoluble and infusible. Similarly, the u...

AI Technical Summary

Problems solved by technology

The raw materials for polyurethane reaction are generally isocyanate, macromolecular diols, small molecule diols, and diamine compounds. The introduction of functional groups generally uses diols and diamine functional compounds as chain extenders (binary extenders) chain agent), partially or completely replace the small molecule chain extender, but because the 3-hydroxyl in the 3-hydroxy-4-ketopyridine derivatives reacts with isocyanate, the method of modifying it into a dibasic alcohol chain extender is introduced into the There are many side reactions, low introduction rate and uncontrollable product structure in polyurethane.

[0006] At present, when introducing hydroxyl compounds that need to be protected in the synthesis of polyurethane, if they are used directly in the reaction, they are prone to many side reactions, difficulties in retaining hydroxyl groups, and uncontrollable structures.

However, if the hydroxyl group is protected in advance and the macromolecule is deprotected after the introduction of polyurethane, there will also be problems such as cumbersome steps and low deprotection efficiency.

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