Preparation method of AKD emulsion free of surface active agent

A surfactant-free and emulsion-free technology, applied in the directions of adding water repellents, adding inorganic compounds, paper, etc., can solve the problems of easy generation of bubbles, complicated process, and reduced sizing efficiency, avoiding foaming problems and simple preparation process. , Good sizing effect

Active Publication Date: 2016-06-22
山东熙来淀粉有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is relatively complicated and the production cycle is long. The surfactant added in the emulsification process will reduce the sizing efficiency and easily generate air bubbles, causing foam problems to the papermaking system and even paper defects.
[0003] The patent of 201410670888.X provides a preparation method of nano-microcrystalline cellulose AKD sizing agent, which avoids the use of surface sizing agent, and can be used for surface sizing and internal sizing of pulp, significantly improving The sizing degree of paper sheets, but the preparation method of microcrystalline cellulose is relatively complicated and expensive, which is not conducive to its wide industrial application
The patent No. ZL200910231301.4 provides a method for the preparation of AKD emulsion with low-molecular-weight amine compounds and hectorite, but the storage stability of the emulsion needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of emulsifier and stabilizer: Disperse 2 parts of laponite in 398 parts of water, 1 part of PAC in 19 parts of water, uniformly mix PAC solution and hectorite dispersion as emulsifier; 15 parts of cationic tapioca starch Gelatinized in 265 parts of water as a stabilizer. Both were heated to 75°C for later use.

[0023] AKD emulsification: Weigh 100 parts of the industrial product AKD and melt it at 75°C, add the emulsifier prepared above into the melted AKD, keep the emulsification temperature at 75°C, and use a high-speed stirring device to stir and emulsify at 15,000 rpm for 5 minutes. Then add cationic starch gelatinization solution at 75°C, maintain the rotation speed and continue emulsifying for 3 minutes, then cool, and the AKD emulsion obtained is a uniform milky white oil-in-water (O / W) emulsion. The mass percentage of AKD is about 12.5%, and the particle size of the emulsion is 1-2 μm.

[0024] In-pulp sizing effect: Take 100 parts of poplar bleac...

Embodiment 2

[0026] Preparation of emulsifier and stabilizer: Disperse 5 parts of hectorite in 145 parts of water, disperse 2.5 parts of PAC in 7.5 parts of water, mix PAC solution and hectorite dispersion as emulsifier; 5 parts of cationic etherified corn Starch was gelatinized in 135 parts of water as a stabilizer. Both were heated to 85°C for later use.

[0027] Emulsification of AKD: Weigh 100 parts of the industrial product AKD, melt it at 85°C, add the emulsifier prepared above into the melted AKD, keep the emulsification temperature at 85°C, and use a high-speed stirring device to stir and emulsify at 20,000 rpm for 10 minutes. Then add cationic starch gelatinization solution at 85°C, keep stirring for 8 minutes at a constant speed, and cool down. The obtained AKD emulsion is a uniform milky white oil-in-water (O / W) emulsion. The mass percentage of AKD is about 25%, and the particle size of the emulsion is 1-3 μm.

[0028] In-pulp sizing effect: Take 50 parts of poplar bleached ch...

Embodiment 3

[0030] Preparation of emulsifier and stabilizer: Disperse 0.5 parts of laponite in 299.5 parts of water, disperse 2.5 parts of PAC in 17.5 parts of water, mix PAC solution and hectorite dispersion as emulsifier; 33.3 parts of cationic etherified potato Starch was gelatinized in 116.7 parts of water to make stabilizer. Both were heated to 55°C for later use.

[0031] Emulsification of AKD: Weigh 100 parts of industrial product AKD, heat to 55°C to melt, add the emulsifier prepared above into the melted AKD, keep the emulsification temperature at 55°C, and use high-speed stirring equipment to stir and emulsify at 10,000 rpm for 15 Minutes, then add cationic starch gelatinization solution at 55°C, continue to emulsify for 2 minutes, cool, and the prepared AKD emulsion is a uniform milky white oil-in-water (O / W) emulsion. The mass percentage of AKD is about 20%, and the particle size of the emulsion is 1-3 μm.

[0032] In-pulp sizing effect: Take 50 parts of hardwood pulp and 50...

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Abstract

The invention relates to a preparation method of an AKD emulsion free of surface active agent. The method includes the following steps of firstly, preparing an emulsifier water phase, wherein hectorite is wetted by water and mixed with aluminium polychlorid hydrosol; secondly, preparing a stabilizer water phase, wherein positive ion starch is pasted; thirdly, preparing the emulsion, wherein the emulsifier water phase and AKD molten liquid are mixed and stirred, then the stabilizer water phase is added to continue to be stirred, and then the stable O / W type AKD emulsion is obtained. Aluminium polychlorid and nanometer solid particles hectorite serve as the emulsifier, positive ion starch serves as the stabilizer, the emulsifier and the stabilizer are added separately to prepare the emulsion, the preparation process is simple, no surface active agent is added, the foaming problem caused by the surface active agent is avoided, and the emulsion is high in stability, small in drop diameter and good in sizing effect.

Description

technical field [0001] The invention relates to a preparation method of AKD emulsion, in particular to a preparation method of surfactant-free AKD emulsion. Background technique [0002] Alkyl ketene dimer (AKD) is one of the commonly used sizing agents for alkaline sizing in the paper industry. It is an unsaturated lactone and is a waxy solid insoluble in water at room temperature. It must be Prepared as an emulsion. Another commonly used medium-alkaline paper-making sizing agent is alkenyl succinic anhydride (ASA), which is liquid at room temperature. Its molecular structure has an acid anhydride that can interact with cellulose. A more severe hydrolysis reaction occurs in contact, and its hydrolyzed product not only has no sizing effect, but also hinders papermaking. The storage stability of the emulsion is poor, and it needs to be emulsified in the workshop, which limits its wide application. The lactone ring in the molecular structure of AKD has a slow hydrolysis rate...

Claims

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Application Information

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IPC IPC(8): D21H21/16D21H17/29D21H17/66D21H17/64
CPCD21H17/29D21H17/64D21H17/66D21H21/16
Inventor 王慧丽陈学帅刘温霞李国栋宋兆萍
Owner 山东熙来淀粉有限公司
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