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Preparation method of paper compound surface sizing agent

A technology of composite surface and sizing agent, applied in papermaking, paper coating, adding water repellent, etc., can solve the problems of difficult large-scale application and high cost of water-based polyurethane, achieve stable reaction, excellent sizing performance, and improved water resistance Effect

Inactive Publication Date: 2014-04-09
TIANJIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of water-based polyurethane itself is high and it is difficult to apply it on a large scale

Method used

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  • Preparation method of paper compound surface sizing agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Stir and react 0.1 mol of polycaprolactone diol, 0.43 mol of isophorone diisocyanate and 41 g of polydimethylsiloxane whose terminal group is a hydroxyl group at 80°C under nitrogen protection for 1 hour to obtain Waterborne polyurethane oligomer;

[0033] (2) Dissolve 0.21mol of DMPA in 0.57mol of N-methylpyrrolidone, then add it to the water-based polyurethane oligomer obtained in step (1), stir and react at 80°C for 2.5-3.5 hours to obtain a water-based polyurethane prepolymer .

[0034] (3) Lower the temperature of the system to 45°C, add 0.21mol of neutralizing agent triethylamine and 206ml of acetone, stir for 0.5 hours, and neutralize the obtained water-based polyurethane prepolymer to form a salt;

[0035] (4) Continue to lower the temperature to 5°C, add 1232g of water, 32.5g of oxidized corn starch, and 0.12mol of ethylenediamine, then raise the temperature to 50°C, and react for 1.5-2 hours to obtain hydroxy silicone oil-modified waterborne polyurethane....

Embodiment 2

[0038] (1) 0.1 mol of polycarbonate diol, 0.44 mol of toluene diisocyanate and 46 g of hydroxyl silicone oil were stirred and reacted for 1 hour at 90°C under nitrogen protection to prepare water-based polyurethane oligomers;

[0039] (2) Dissolve 0.17mol of DMPA in 0.47mol of N-methylpyrrolidone, then add it to the water-based polyurethane oligomer obtained in step (1), stir at 90°C, and continue to react for 2.5-3.5 hours to obtain a water-based polyurethane oligomer Polymer;

[0040] (3) Lower the temperature to 50°C, add 0.15mol of triethanolamine and 228ml of methyl ethyl ketone as neutralizing agents, stir for 0.5 hours, and neutralize the obtained water-based polyurethane prepolymer to form a salt;

[0041] (4) Continue to lower the temperature to 10°C, add 885g of water, add 60g of anionic tapioca starch, and 0.17mol of ethylenediamine, then raise the temperature to 60°C, and react for 1.5-2 hours to obtain a water-based polyurethane modified with hydroxyl silicone oil...

Embodiment 3

[0044] (1) 0.1 mol of polycaprolactone diol, 0.46 mol of isophorone diisocyanate and 39.5 g of hydroxyl silicone oil were stirred and reacted for 1 hour at 85 °C under the protection of nitrogen to prepare a water-based polyurethane oligomer;

[0045] (2) Dissolve 0.16mol of DMPA in 0.43mol of N-methylpyrrolidone, then add it to the water-based polyurethane oligomer obtained in step (1), stir at 85°C, and continue the reaction for 2.5-3.5 hours to obtain a water-based polyurethane oligomer Polymer;

[0046] (3) Lower the temperature to 50°C, add 0.16mol of neutralizing agent triethylamine and 206ml of acetone, stir for 0.5 hours, and neutralize the obtained waterborne polyurethane prepolymer to form a salt;

[0047] (4) Continue to lower the temperature to 8°C, add 922g of water, then add 48.7g of wheat acid modified starch, 0.20mol of ethylenediamine, then raise the temperature to 70°C, and react for 1.5-2 hours to obtain hydroxy silicone oil modified waterborne polyurethane ;...

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Abstract

The invention discloses a preparation method of a paper compound surface sizing agent and provides a preparation method of a surface sizing agent with good combination property. The preparation method comprises the steps of: with polymers (dihydric alcohol and diisocyanate) as raw materials, adding a hydroxyl-containing modifying agent, stirring for reaction at a temperature of 80-90 DEG C and under the protection of an inert gas to prepare a waterborne polyurethane oligomer; adding a hydrophilic substance, stirring at a temperature of 80-90 DEG C for reacting for 2.5-3.5h to obtain a waterborne polyurethane prepolymer; cooling to 45-50 DEG C, adding a neutralizing agent and a cosolvent, stirring for reaction to ensure that the waterborne polyurethane prepolymer neutralizes to form a salt; cooling to 5-10 DEG C, sequentially adding water, a part of starch and a chain extender, then raising the temperature to 50-60 DEG C, reacting to prepare hydroxyl silicone oil modified waterborne polyurethane; and performing reduced pressure distillation to remove the cosolvent, adding the rest of starch, raising the temperature to 90 DEG C, and stirring for reaction to obtain the waterborne polyurethane / starch compound surface sizing agent. The preparation method is simple and is low in cost.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a method for preparing a hydroxyl silicone oil-modified waterborne polyurethane / starch composite surface sizing agent. Background technique [0002] Surface sizing agent is an auxiliary agent coated on the surface of paper and cardboard to improve the water resistance and surface properties of paper. It is an important technical measure to improve printing performance. Surface sizing is becoming more and more important, and its dosage is greatly increased. After the surface of the paper is sized, part of the sizing agent penetrates into the paper layer and fills the gaps between pulp fibers; the other part remains on the surface of the paper. The use of surface sizing has the following advantages: (1) It can reduce the amount of internal sizing agent and reduce the cost of papermaking; (2) It is easy to control the degree of sizing; (3) High-quality paper can be obtained afte...

Claims

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Application Information

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IPC IPC(8): D21H21/16D21H19/14D21H19/24C08G18/66C08G18/64C08G18/61C08G18/32C08G18/12
Inventor 郭玉花
Owner TIANJIN UNIV OF COMMERCE
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