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Preparation method of epoxy resin-modified cation waterborne polyurethane emulsion

A technology of water-based polyurethane and epoxy resin, applied in the direction of water-repellent addition, etc., can solve the problems of not conforming to the trend of alkalization, and the degree of sizing is difficult to meet the cultural paper, etc., to achieve good sizing effect and increase the degree of sizing , The effect of simple process operation

Inactive Publication Date: 2014-04-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prepared polyurethane emulsion needs to be used in combination with aluminum salt, starch, etc., which does not conform to the trend of alkalization in pulp sizing in the paper industry, and the sizing degree is difficult to meet the requirements of cultural paper, which is far from the actual situation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 16 parts of polytetrahydrofuran diol (1000), 9 parts of isophorone diisocyanate and 0.01 part of dibutyltin dilaurate in a three-necked flask with nitrogen protection with a stirring device in parts by mass and stir evenly and heat up React at 80°C for 2 hours, cool down to 70°C, add 2 parts of N-methyldiethanolamine, 0.6 parts of trimethylolpropane and 2 parts of E-51 in a certain order and react for 1 hour, and stop the reaction after the NCO content reaches the theoretical value , and finally cooled to room temperature, adding 1.2 parts of acetic acid to neutralize and form a salt, adding 116 parts of deionized water to emulsify under high-speed stirring to obtain a milky white translucent emulsion with a solid content of 20%.

Embodiment 2

[0028] Add 16 parts of polytetrahydrofuran diols (1000), 9 parts of isophorone diisocyanate and 0.01 part of dibutyltin dilaurate in a three-necked flask with nitrogen protection with a stirring device in parts by mass and stir evenly and heat up to React at 60°C for 3 hours, raise the temperature to 70°C, then add 2 parts of N-methyldiethanolamine, 0.6 parts of trimethylolpropane and 2 parts of E-44 in a certain order and react for 1 hour, and stop the reaction after the NCO content reaches the theoretical value , and finally cooled to room temperature, adding 1.2 parts of acetic acid to neutralize the salt, adding 86 parts of deionized water to emulsify under high-speed stirring to obtain a milky white translucent emulsion with a solid content of 25%.

Embodiment 3

[0030] Add 15 parts of polytetrahydrofuran diol (1000), 9.5 parts of isophorone diisocyanate and 0.01 part of stannous octoate into a three-necked flask protected by nitrogen with a stirring device in parts by mass, stir evenly and heat up to 70°C for reaction 2.5h, cool down to 70°C, then add 2 parts of N-methyldiethanolamine, 0.6 parts of trimethylolpropane and 2 parts of E-51 in a certain order to react for 1 hour, stop the reaction after the NCO content reaches the theoretical value, and finally Cool down to room temperature, add 1.2 parts of acetic acid to neutralize and form a salt, and add 116 parts of deionized water to emulsify under high-speed stirring to obtain a milky white translucent emulsion with a solid content of 20%.

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PUM

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Abstract

The invention provides a preparation method of an epoxy resin-modified cation waterborne polyurethane emulsion. The preparation method comprises the following steps of: firstly, pre-polymerizing: carrying out a pre-polymerizing reaction on oligomer polyalcohol, isocyanate and organic tin catalyst according to the mass fraction at the temperature of 60-80DEG C for 1-3 hours; secondly, extending a chain: adding a micromolecule hydroxyl monomer, a hydrophilic extended chain agent and epoxy resin in a reactor and carrying out a chain extension reaction at the temperature of 60-80DEG C for 0.5-2 hours; thirdly, neutralizing: adding a neutralizing agent in the reactor and finishing a salt forming reaction; and fourthly, emulsifying: adding deionized water at constant speed to obtain a modified cation waterborne polyurethane emulsion. The preparation method provided by the invention has the advantages of simpleness in operation of process, energy saving, environment friendliness and the like. According to the preparation method of the epoxy resin-modified cation waterborne polyurethane emulsion which is provided by the invention, by adding the epoxy resin and introducing a cross-linking structure, the size resistance, the fold-resisting times and the ring crash index of sized paper are improved.

Description

technical field [0001] The invention belongs to the technical field of development and preparation of polyurethane surface sizing agents, and in particular relates to a preparation method of epoxy resin modified cationic water-based polyurethane emulsion. Background technique [0002] Surface sizing is to apply a uniform thin layer of sizing material on the surface of paper or cardboard that has undergone internal pulp sizing or has not undergone internal pulp sizing to obtain liquid-repellent properties. Surface sizing can improve the physical strength, abrasion resistance, durability, hand feeling and smoothness of the paper surface, and can also overcome the defects of paper surface fluffing and powder falling. [0003] Polyurethane is the latest type of surface sizing agent and has broad development prospects. Introducing a small amount of ionic groups into the main chain of the polymer can improve the performance of the polymer and broaden its application field. In ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/10D21H21/16
Inventor 沈一丁王小荣赖小娟岳杰王磊
Owner SHAANXI UNIV OF SCI & TECH
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