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Preparation method of surface sizing agent of cationic polyurethane/cationic styrene-acrylic composite emulsion

A technology of cationic polyurethane and styrene-acrylic composite emulsion, which is applied in the direction of water-repellent addition, paper, textiles and papermaking, etc. It can solve the problems of poor water resistance, poor high temperature resistance, low elasticity and hardness, etc., and achieve Improve the effect of sizing and reduce the cost of sizing

Active Publication Date: 2010-02-24
MUDANJIANG HENGFENG PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Water-based polyurethane has the advantages of good physical and mechanical properties, excellent cold resistance, alkali resistance, elasticity and softness with little change with temperature, etc., but its high temperature resistance is poor and water resistance is poor
Acrylate emulsion has good water resistance and weather resistance, but it has high hardness and is not resistant to solvents.

Method used

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  • Preparation method of surface sizing agent of cationic polyurethane/cationic styrene-acrylic composite emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation of cationic polyurethane / cationic styrene-acrylic composite emulsion surface sizing agent comprises the following steps:

[0023] (1), Synthesis of Cationic Polyurethane Emulsion:

[0024] In a four-neck flask, add isophorone diisocyanate, 1,4-butanediol and dehydrated polyethylene oxide, gradually raise the temperature to 60-65°C, and keep it at 60-65°C for 1.5-3h; Add the butanone solution of the cationic chain extender dropwise under stirring; after the dropwise addition, carry out the chain extension reaction at 60-65°C for 3-4 hours to obtain the polyurethane prepolymer containing amino groups; cool the prepolymer, when the temperature When it reaches 25-30°C, add acid to neutralize, add acetone to dilute, stir and mix rapidly to obtain the intermediate; add an appropriate amount of acetone to reduce the viscosity of the prepolymer to 40-80mPa·S; slowly add deionized water to the prepolymer During the process, high-speed stirring and emulsification...

Embodiment 2

[0042] Synthesis of Cationic Polyurethane Emulsion:

[0043] In a four-necked flask, add 22.0g of isophorone diisocyanate, 2.3g of 1,4-butanediol and 20.0g of dehydrated polyethylene oxide (molecular weight: 800), gradually raise the temperature to 60°C, and keep it at 60~ React at 65°C for 1.5h. Under stirring, 10 ml of a butanone solution containing 2.2 g of diethylenetriamine was added dropwise. After the dropwise addition, the chain extension reaction is carried out at 60° C. for 3 to 4 hours to obtain an amino group-containing polyurethane prepolymer. Lower the temperature of the prepolymer, and when the temperature reaches 25°C, add acetic acid to neutralize, add acetone to dilute, stir and mix quickly to obtain the intermediate. Add a certain amount of acetone to reduce the viscosity of the prepolymer to 70mpa·S.

[0044] Slowly add 65g of deionized water into the prepolymer, while emulsifying with high-speed stirring, dropwise adding acetic acid to adjust the pH of ...

Embodiment 3

[0046] Preparation of polyurethane / styrene-acrylic composite emulsion:

[0047]Add the prepared cationic polyurethane 100ml (solid content 30%), 2g Span and 60ml deionized water in the four-necked flask, heat in a water bath, and pass into nitrogen protection, control the flow of nitrogen to be 5ml / min, stir, Gradually raise the temperature to 80°C and maintain a constant temperature. Add 10 g of styrene, 3 g of methyl acrylate, 1 g of acryloyloxyethyltrimethylammonium chloride, 1 g of acrylamide and 1.5 mg of water-soluble azo initiator dropwise, and drop them evenly within 3 hours. , after all the monomers and initiators are added dropwise, continue to react for 3 hours, then cool and discharge to obtain cationic polyurethane / cationic styrene-acrylic composite emulsion.

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Abstract

The invention relates to a preparation method of a surface sizing agent of cationic polyurethane / cationic styrene-acrylic composite emulsion, belonging to the field of paper making chemicals. The preparation method comprises the following steps: adding isophorone diisocyanate, 1,4-butanediol and dehydrated polyethylene glycol oxide into a four-hole boiling flask, and increasing the temperature; stirring and dropwise adding the butanone solution of a cationic chain extender to obtain a prepolymer; decreasing the temperature; adding acid for neutralization; adding acetone for dilution; stirringthe mixture; and then, adding a proper amount of acetone to reduce the viscosity of the prepolymer; adding deionized water into the prepolymer for emulsification; adjusting the pH value to 5-7, and removing the acetone and the butanone to obtain cationic aqueous polyurethane emulsion; and adding the prepared cationic polyurethane, emulsifier and deionized water into the four-hole boiling flask; heating the mixture in the water bath with nitrogen gas protection; stirring the mixture, and increasing the temperature; and adding the water solution of phenyl ethylene, acrylic ester, cationic monomer, acrylamide and water-soluble azo initiators for reaction for 2-4h, cooling the mixture, and then, discharging to obtain a finished product. The invention can improve the sizing effect and reduce the sizing cost.

Description

technical field [0001] The invention belongs to the field of papermaking chemicals, in particular to a method for preparing a cationic polyurethane / cationic styrene-acrylic composite emulsion surface sizing agent. Background technique [0002] Surface sizing is to apply a layer of sizing agent on the surface of paper or cardboard. After drying, the sizing agent will form a layer of adhesive film on the surface of paper and cardboard. The main functions of surface sizing are summarized as follows: ① Improve the printing performance of paper and cardboard; ② Improve the oil and water resistance of paper and cardboard; ③ Improve the physical strength of paper and cardboard; ④ Improve the durability and wear resistance of paper ⑤ Surface sizing can reduce the difference between the two sides of the paper. In the 1940s and 1950s, there was a small amount of research on waterborne polyurethane surface sizing agents, but due to storage stability and other reasons, this research ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H17/57D21H17/45
Inventor 潘泉利查瑞涛鲍漫秋王淑珍
Owner MUDANJIANG HENGFENG PAPER CO LTD
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