Preparation method of composite macromolecular sizing agent

A sizing agent and polymer technology, applied in the field of papermaking, can solve the problems of AKD sizing agent being easily hydrolyzed and not resistant to storage, etc.

Inactive Publication Date: 2021-04-09
冠宏化工(扬州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the above defects, the present invention aims to provide a composite sizing agent that can form a closed water-resistant film on the paper surface and an esterified layer on the surface of the fiber, and solve the problem that the AKD sizing agent is easily hydrolyzed and cannot be stored The problem

Method used

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  • Preparation method of composite macromolecular sizing agent
  • Preparation method of composite macromolecular sizing agent
  • Preparation method of composite macromolecular sizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] AKD: AKD emulsion, C16.

[0019] AKD addition ratio: 15%

[0020] SAE sizing agent preparation monomer is under nitrogen protection and stirring, add initiator, control the temperature at 120°C, and react for 1h; cool to 80°C, add initiator, defoamer, and add 15% AKD emulsion (C16) , PH control 5, heat preservation reaction 1h, add initiator, slowly drop secondary synthesis monomer, control dosing time 2h, heat preservation and continuous reaction 1h, cool down to 30°C to prepare composite polymer sizing agent.

[0021] Dilute tapioca raw starch to a concentration of 10% after enzymatic digestion and cooking, add compound polymer sizing agent, SAE sizing agent, and C16 AKD emulsion sizing agent to prepare glue solution; use NBKP:LBKP:BCTMP=20:70 :10 ratio paper-making as base paper for sizing evaluation.

[0022] Composite polymer sizing agent stability: no delamination, hydrolysis and agglomeration when stored at room temperature for 3 months.

[0023]

[0024] T...

Embodiment 2

[0026] AKD: AKD emulsion, C14.

[0027] AKD addition ratio: 35%

[0028] SAE sizing agent preparation monomers are under nitrogen protection and stirring, add initiators, control the temperature at 120°C, and react for 1h; cool to 85°C, add initiators and defoamers, slowly drop secondary synthesis monomers, add The drug time is controlled for 1 hour, the heat preservation is continued for 0.5 hours, the temperature is lowered to 60°C, the initiator, 35% AKD emulsion (C14) is added, the pH is controlled to 4, the heat preservation reaction is 1.5h, and the temperature is cooled to 30°C to obtain a composite high molecular sizing agent.

[0029] Dilute corn starch to a concentration of 10% after enzymatic digestion and cooking, add compound polymer sizing agent, SAE sizing agent, and C14 AKD emulsion sizing agent to prepare glue; use 100% OCC pulp papermaking as the base paper , for sizing evaluation.

[0030] Composite polymer sizing agent stability: no delamination, hydroly...

Embodiment 3

[0034] AKD: AKD wax, C18.

[0035] AKD addition ratio: 25%

[0036] SAE sizing agent preparation monomers are under nitrogen protection and stirring, add initiators, control the temperature at 120°C, and react for 1h; cool to 85°C, add initiators and defoamers, slowly drop secondary synthesis monomers, add The drug time is controlled for 2 hours, the heat preservation is continued for 1 hour, the temperature is lowered to 40 °C, the initiator and 25% AKD wax (C18) are added, the pH is controlled to 3, the heat preservation reaction is 2 hours, and the temperature is cooled to 30 °C to obtain a composite polymer. Glue.

[0037] Dilute tapioca raw starch to 10% concentration after enzymatic digestion and cooking, add composite polymer sizing agent, SAE sizing agent, and C18 AKD wax emulsified emulsion to prepare glue; use 100% BCTMP pulp papermaking as the base paper , for sizing evaluation.

[0038] Composite polymer sizing agent stability: no delamination, hydrolysis and ag...

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Abstract

The invention relates to a preparation method of a composite macromolecular sizing agent. According to the invention, the hydroxyl on an SAE type sizing agent is linked with AKD in advance, so that the hydrolysis of AKD is avoided, and the SAE type sizing agent is attached with the hydrophobic group of the AKD sizing agent, therefore, the prepared composite macromolecular sizing agent does not have the situation of hydrolysis failure, and meanwhile, the composite macromolecular sizing agent has a water-resistant macromolecular+starch chain cross-linking+fiber chain net structure and the AKD hydrophobic group; therefore, the sizing agent has double effects of sealing the paper surface by the water-resistant film and protecting the fibers by the AKD hydrophobic group, the water resistance, moisture absorption and moisture regaining of the paper are effectively improved, and the sizing agent has a good effect on Cobb and moisture regaining of the paper in practical application evaluation.

Description

technical field [0001] The invention relates to a preparation method of a composite polymer sizing agent, belonging to the technical field of papermaking. Background technique [0002] In the process of production, storage and use, paper fibers will absorb moisture in the air and the environment, which will cause the moisture in the paper to rise and the strength to decrease, which will seriously affect the performance of the paper. In areas with high humidity, industrial paper includes kraft paper, corrugated paper, Moisture absorption such as cardboard paper is particularly serious. In response to this problem, the two commonly used solutions are internal sizing and surface sizing. [0003] In-pulp sizing, as the name implies, is to add colloidal materials to the pulp of papermaking to improve the water resistance and strength of paper. However, after many years of application, it has been found that there are some inevitable problems in internal pulp sizing. First: the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
CPCD21H21/16
Inventor 王欢
Owner 冠宏化工(扬州)有限公司
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