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Preparation method and applications of cationic waterborne polyurethane surface sizing agent

A water-based polyurethane and cationic technology, applied in the direction of water-repellent addition, coating, paper coating, etc., can solve the problems of large odor of emulsion, long synthesis time, complicated process, etc., achieve good water resistance and stability, and improve performance Effect

Active Publication Date: 2012-07-18
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this method is more complicated, the synthesis time is longer, and the storage stability of the cationic polyurethane / cationic styrene-acrylic composite emulsion is not good, and the emulsion has a large odor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Under the operating conditions of the comparative example, add 1.0 g of hydroxypropyl polydimethylsiloxane (8427) to the three-necked flask before vacuumizing, and finally add 53.79 g of water to obtain a theoretical solid content of 30%. , Pale yellow translucent emulsion.

Embodiment 2

[0027] Example 2: Under the operating conditions of the comparative example, add 0.5 g of glyceryl monostearate to the three-necked flask before vacuumizing, and finally add 44.53 g of water to obtain a milky white translucent emulsion with a theoretical solid content of 35%.

Embodiment 3

[0028] Embodiment 3: under the operating condition of embodiment 1, change 5.68gTDI into 7.25g IPDI, add 0.1mol / L dilute hydrochloric acid 1.28g (neutralization degree is 80%) when neutralizing, add 225.05g water at last, get Theoretical solid content is 10%, colorless translucent emulsion.

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PUM

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Abstract

The invention discloses a preparation method of cationic waterborne polyurethane, belonging to the field of organic adhesives. The technologic route implemented according to the following steps is divided into three stages: the first stage: prepolymerization, namely polyol, small molecular hydroxyl monomer, isocyanate and modified monomer are subject to stepwise polymerization and free radical polymerization to generate modified polyurethane prepolymer; the second stage: chain extension, namely the prepolymer is dropwise added with hydrophilic chain extending monomer (monomer containing hydrophilic groups), and ionizing groups are introduced in; and the third stage: neutralization and emulsification. Aiming at the above defects of the waterborne polyurethane surface sizing agent, polyurethane is modified by hydrophobic monomer in the method, and the modified polyurethane emulsion has excellent water resistance and stability. Paper subject to the sizing of the product according to the invention has obviously enhanced using performance.

Description

technical field [0001] The invention belongs to the field of organic adhesives, and relates to a preparation method of a cationic waterborne polyurethane surface sizing agent. Background technique [0002] Sizing is an important link in the papermaking process, it can endow the paper with certain liquid resistance and increase its strength. The sizing process is to use a hydrophobic substance to cover the surface of the paper fiber to form a hydrophobic film, which reduces the free energy of the fiber surface, thereby resisting the diffusion, wetting or penetration of water or other liquids on the fiber surface. The substance with this property is called For sizing agent. There are two methods of sizing, one is to add sizing agent to the pulp before the paper is formed (during beating or batching), which is called in-pulp sizing, and the other is to apply the sizing agent on the surface of the paper after the paper is formed. Apply glue to the surface. Surface sizing can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/64C08G18/36C08G18/61C08G18/32D21H21/16D21H19/24
Inventor 杜郢顿全秀周春利王哲周太炎
Owner 溧阳常大技术转移中心有限公司