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VOC-free water-based epoxy polyurethane surface sizing enhancer and preparation method thereof

A technology of epoxy polyurethane and surface sizing, which is applied in the direction of reinforcement addition, coating, paper coating, etc., can solve the problems of water resistance, solvent resistance and poor mechanical properties, and achieve improved paper strength performance and good adhesion performance. , The effect of improving water resistance

Inactive Publication Date: 2015-02-04
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The self-emulsification method is to introduce hydrophilic groups into the polyurethane prepolymer molecules so that they can be emulsified in water, which can completely eliminate the adverse effects of small molecule emulsifiers and organic solvents on the application performance and environmental protection of sizing agent products, but due to With the introduction of hydrophilic groups, water-based polyurethane films often have the disadvantages of poor water resistance, solvent resistance and poor mechanical properties.

Method used

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  • VOC-free water-based epoxy polyurethane surface sizing enhancer and preparation method thereof

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Embodiment 1

[0038] The embodiment of the present invention provides a method for preparing a VOC-free water-based epoxy polyurethane surface sizing enhancer, comprising the following steps:

[0039]Step 101, prepolymerization: 60 parts of methyl methacrylate, 35 parts of polycaprolactone diol, 20 parts of isophorone diisocyanate, 0.75 parts of trimethylol propane, 18 parts of dimethylol propionic acid Add 0.18 parts of dibutyltin dilaurate into a dry reactor, and react at 90°C for 2 hours to obtain a polyurethane prepolymer;

[0040] Step 102, capping reaction: add 3 parts of hydroxyethyl acrylate to the polyurethane prepolymer to carry out capping reaction, and the reaction time is 0.5 hours;

[0041] Step 103, emulsification: Cool the reaction system to room temperature, then add 15 parts of triethylamine for neutralization, neutralize for 20 minutes, then add 200 parts of water under high-speed stirring, stir and disperse for 20 minutes to obtain a white emulsion;

[0042] Step 104, f...

Embodiment 2

[0044] The embodiment of the present invention provides a method for preparing a VOC-free water-based epoxy polyurethane surface sizing enhancer, comprising the following steps:

[0045] Step 201, prepolymerization: 50 parts of ethyl methacrylate, 30 parts of polycarbonate diol, 15 parts of hexamethylene diisocyanate, 0.5 part of trimethylolpropane, 15 parts of dimethylol butyric acid and Add 0.13 parts of dibutyltin diacetate into a dry reactor and react at 80°C for 2.5 hours to obtain a polyurethane prepolymer;

[0046] Step 202, capping reaction: add 2 parts of hydroxypropyl methacrylate to the polyurethane prepolymer to carry out capping reaction, and the reaction time is 1 hour;

[0047] Step 203, emulsification: Cool the reaction system to room temperature, then add 10 parts of ammonia water for neutralization, neutralize for 30 minutes, then add 160 parts of water under high-speed stirring, stir and disperse for 25 minutes to obtain a white emulsion;

[0048] Step 204,...

Embodiment 3

[0050] The embodiment of the present invention provides a method for preparing a VOC-free water-based epoxy polyurethane surface sizing enhancer, comprising the following steps:

[0051] Step 301, prepolymerization: add 40 parts of styrene, 20 parts of polytetrahydrofuran diol, 10 parts of toluene diisocyanate, 0.15 parts of trimethylolpropane, 10 parts of sodium dihydroxypropanesulfonate and 0.1 part of stannous octoate to dry React in a reactor at 70°C for 4 hours to obtain a polyurethane prepolymer;

[0052] Step 302, capping reaction: add 5 parts of methylol acrylamide to the polyurethane prepolymer to carry out capping reaction, and the reaction time is 1.5 hours;

[0053] Step 303, emulsification: Cool the reaction system to room temperature, then add 8 parts of triethylamine for neutralization, neutralize for 25 minutes, then add 135 parts of water under high-speed stirring, stir and disperse for 30 minutes to obtain a white emulsion;

[0054] Step 304, free radical po...

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Abstract

The invention discloses a VOC-free water-based epoxy polyurethane surface sizing enhancer which is composed of the following materials, by weight, 12-75 parts of vinyl monomer, 8-35 parts of polymer polyol, 2.5-20 parts of a polyisocyanate compound, 0.12-0.75 part of trimethylol propane, 3-18 parts of a hydrophilic chain extender, 0-0.18 parts of a catalyst, 0.8-5 parts of vinyl monomer containing activated hydrogen, 0.12-2.5 parts of an initiator and 5-57 parts of a monomer mixture, wherein the monomer mixture contains 4-35 parts of vinyl monomer and 1-22 parts of functional monomer containing epoxy groups. The invention also discloses a preparation method of the VOC-free water-based epoxy polyurethane surface sizing enhancer. By the use of the enhancer, a surface sizing agent with good adhesion property and film-forming property can be obtained. During the preparation process of the enhancer, there is no organic solvent. The preparation process is simple, safe, environmentally friendly and pollution-free.

Description

technical field [0001] The invention relates to a surface sizing enhancer and a preparation method thereof, in particular to a VOC-free water-based epoxy polyurethane surface sizing enhancer and a preparation method thereof. Background technique [0002] Surface sizing is the secondary processing of paper. By coating special chemicals, paper can be endowed with better physical and mechanical properties and surface printability. Polymer surface sizing agents have specific functions and a wide range of applications due to their adjustable molecular size and structure. At present, the polymer surface sizing agents used mainly include styrene-maleic anhydride copolymer (SMA), styrene-acrylic acid copolymer aqueous solution (SAA), styrene-acrylate emulsion copolymer (SAE), waterborne polyurethane Latex (PUD), etc. [0003] The currently used polymer surface sizing agents require organic solvents or surfactants in the preparation process, and have high foaming properties, which ...

Claims

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Application Information

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IPC IPC(8): D21H21/18D21H19/24C08F283/00C08G18/67C08G18/66C08G18/12
Inventor 赖小娟闫蓓王磊宫米娜
Owner SHAANXI UNIV OF SCI & TECH
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