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Method for preparing polyurethane surface sizing agent

A technology of surface sizing agent and polyurethane, which is applied in the direction of water repellent addition, paper, textiles and papermaking, etc., can solve the problems of water resistance, solvent resistance and poor mechanical properties, and achieve improved performance indicators, good development prospects, and process Simple operation effect

Inactive Publication Date: 2011-08-10
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) First add polyoxypropylene diol into the dry reactor, and heat the reactor to 80°C, then add isophorone diisocyanate and catalyst dibutyltin dilaurate into the reactor, polyoxypropylene The mass ratio of diol to isophorone diisocyanate is 1:0.3, the mass ratio of polyoxypropylene diol to catalyst dibutyltin dilaurate is 1:0.001, and the polymerization reaction is carried out at 80°C for 4.5 hours to form polyurethane prepolymer Body A;

[0021] 2) Mix the polyurethane prepolymer A and the hydrophilic chain extender sodium ethylenediaminoethanesulfonate in a mass ratio of 1:0.05 to carry out the chain extension reaction, the reaction temperature is 60°C, and the reaction time is 4 hours to obtain the polymer Object B;

[0022] 3) cooling down, adding an organic base trimethylamine to the polymer B to adjust the pH value to 7.5, adding deionized water at a temperature of 0-40°C under high-speed stirring to obtain a white polyurethane emulsion C with a solid content of...

Embodiment 2

[0026] 1) First add polytetrahydrofuran diol into the dry reactor, and heat the reactor to 90°C, then add toluene diisocyanate and catalyst dibutyltin dilaurate into the reactor, polytetrahydrofuran diol and toluene di The mass ratio of isocyanate is 1: 1.2, the mass ratio of polytetrahydrofuran diol and catalyst dibutyltin dilaurate is 1: 0.005, carries out polymerization reaction at 90 ℃ for 1.0 hour, forms polyurethane prepolymer A;

[0027] 2) Mix the polyurethane prepolymer A and the hydrophilic chain extender 1,4-butanediol-2-sodium sulfonate in a mass ratio of 1:0.1 to carry out the chain extension reaction, the reaction temperature is 70°C, and the reaction time is 1 hour, obtain polymer B;

[0028] 3) cooling down, adding an organic base triethylamine to the polymer B to adjust the pH value to 7.0, then adding deionized water at a temperature of 0-40°C under high-speed stirring to obtain a white polyurethane emulsion C with a solid content of 30%;

[0029] 4) Mix wat...

Embodiment 3

[0032] 1) First, polycaprolactone diol is added to the dry reactor, and the reactor is heated to 82°C, then hexamethylene diisocyanate and catalyst dibutyltin dilaurate are added to the reactor, poly The mass ratio of caprolactone diol to hexamethylene diisocyanate is 1:0.8, the mass ratio of polycaprolactone diol to catalyst dibutyltin dilaurate is 1:0.008, and the polymerization reaction is carried out at 85°C for 3.0 Hour, form polyurethane prepolymer A;

[0033] 2) Mix the polyurethane prepolymer A and the hydrophilic chain extender 1,2-dihydroxy-3-propanesulfonate sodium in a mass ratio of 1:0.08 to carry out the chain extension reaction, the reaction temperature is 80°C, and the reaction time is 2.5 hours, obtain polymer B;

[0034] 3) cooling down, adding an organic base triethanolamine to the polymer B to adjust the pH value to 8.0, then adding deionized water at a temperature of 0-40°C under high-speed stirring to obtain a white polyurethane emulsion C with a solid c...

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Abstract

The invention discloses a method for preparing a novel polyurethane surface sizing agent. Diisocyanate and polyglycol are first uniformly blended and then added with a moderate amount of catalyst to react, so that polyurethane prepolymer is obtained; hydrophilic chain extender is then added to react with the polyurethane prepolymer; the temperature is reduced, organic base is added to regulate tothe pH value, deionized water is added under high-speed shearing, and after emulsification, polyurethane emulsion is obtained; and the temperature is increased, vinyl monomer is added in the polyurethane emulsion, and initiator is used to initiate polymerization, so that the modified aqueous polyurethane emulsion surface sizing agent is prepared. The invention can completely eliminate the adverseaffection of small-molecular emulsifier and organic solvent on the application performance of sizing agent product and environment protection, and replaces internal sizing.

Description

technical field [0001] The invention belongs to the field of fine chemicals preparation technology, in particular to a preparation method of polyurethane surface sizing agent emulsion. Background technique [0002] 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), water-based 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 are not good for the environment or application effect. The above problems inhibit the complete replacement of internal sizing by surface sizing, which limits the expansion and application of secondary fibers. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/00C08F120/14C08F120/18C08F220/18C08F2/24C08G18/48C08G18/32C08G18/42C08G18/44D21H21/16D21H17/57D21H17/37
Inventor 赖小娟沈一丁王磊赵静王小荣
Owner SHAANXI UNIV OF SCI & TECH
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