Method for preparing alkyl ketene dimer emulsion without surfactants

A technology of alkyl ketene dimer and no surfactant, which is applied in the field of preparation of alkyl ketene dimer emulsion, which can solve the problems of emulsion aggregation stability to be improved, fast aging speed, etc., and achieve long-lasting stability , The preparation process is simple, and the effect of avoiding foam problems

Active Publication Date: 2016-08-31
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

Patent No. ZL 201010281410.X discloses a method of emulsifying alkyl ketene dimer with chitosan and nano-titanium dioxide. Fast, but the stability of emulsion droplet aggregation needs to be 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 sodium glutamate in 19 parts of water, mix the two solutions evenly, adjust the pH value to 4 with hydrochloric acid; Cationic tapioca starch was gelatinized in 270 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 10,000 rpm for 8 minutes , and then add cationic starch gelatinization solution at 75°C, maintain the rotating speed and continue emulsifying for 3 minutes, and cool down. 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...

Embodiment 2

[0026] Preparation of emulsifier and stabilizer: Disperse 2 parts of hectorite in 398 parts of water, disperse 0.25 parts of sodium glutamate in 20 parts of water, mix the two solutions fully, adjust the pH value to 3 with sulfuric acid; Cationic etherified corn starch was gelatinized in 255 parts of water as a stabilizer. Both were heated to 55°C for later use.

[0027] Emulsification of AKD: Weigh 100 parts of the industrial product AKD, melt it at 55°C, add the emulsifier prepared above into the melted AKD, keep the emulsification temperature at 55°C, and use a high-speed stirring device to stir and emulsify at 15,000 rpm for 2 minutes , then add cationic starch gelatinization solution at 55°C, keep stirring for 5 minutes at a constant speed, and cool down. The prepared AKD emulsion 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 1-3 μm.

[0028] In-pulp sizing effect: Take 100 parts...

Embodiment 3

[0030] Preparation of emulsifier and stabilizer: Disperse 5 parts of hectorite in 145 parts of water, 2 parts of sodium glutamate in 8 parts of water, mix the two solutions fully, adjust the pH value to 7 with hydrochloric acid; Cationic potato starch was gelatinized in 135 parts of water to make stabilizer. Both were heated to 85°C for later use.

[0031]Emulsification of AKD: Weigh 100 parts of industrial product AKD, heat to 85°C to melt, add the emulsifier prepared above into the melted AKD, keep the emulsification temperature at 85°C, and use high-speed stirring equipment to stir and emulsify at 20,000 rpm After 10 minutes, cationic starch gelatinization solution at 85°C was added, and the emulsification was continued for 8 minutes. The AKD emulsion obtained was 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.

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

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Abstract

The invention relates to a method for preparing alkyl ketene dimer emulsion without surfactants. The method includes steps of (1), preparing emulsifier water phases, to be more specific, wetting hectorite, uniformly mixing the hectorite and aqueous solution of water-soluble sodium amino acid salt with each other and regulating pH (potential of hydrogen) values of the hectorite and the aqueous solution by the aid of diluted acid; (2), pasting cationic starch to prepare stabilizer water phases; (3), preparing the alkyl ketene dimer emulsion, to be more specific, mixing the emulsifier water phases and AKD (alkyl ketene dimer) melted liquid with one another to obtain mixtures, stirring the mixtures, adding the stabilizer water phases into the mixtures and continuing to stir the mixtures and the stabilizer water phases to obtain the stable O/W (oil-in-water) type AKD emulsion. The method has the advantages that the water-soluble sodium amino acid salt and the nanometer solid granular hectorite are used as emulsifiers, the cationic starch is used as a stabilizer, the emulsifiers and the stabilizer are added in a sectional manner to prepare the alkyl ketene dimer emulsion, processes for preparing the alkyl ketene dimer emulsion are simple, the surfactants are omitted, accordingly, the problem of foam due to the surfactants can be solved, the alkyl ketene dimer emulsion is durable in stability, liquid drop has a small diameter, and good adhesive application effects can be realized.

Description

technical field [0001] The invention relates to a preparation method of an alkyl ketene dimer emulsion, in particular to a preparation method of a surfactant-free alkyl ketene dimer emulsion. Background technique [0002] Alkyl ketene dimer (AKD) is an unsaturated lactone. It is a waxy solid insoluble in water at room temperature. It can be used as a paper sizing agent, but it must be prepared into an emulsion before use. One of the commonly used sizing agents for medium-alkaline sizing. Another commonly used paper-making sizing agent, alkenyl succinic anhydride, is liquid at room temperature. The anhydride in its molecular structure is easily hydrolyzed, and its storage stability is poor. It needs to be emulsified on-site in the workshop, and its hydrolyzed products are easy to deposit on the paper machine, causing papermaking obstacles. , its application is limited. The hydrolysis rate of the lactone ring in the alkyl ketene dimer emulsion is slow, and the emulsion dropl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H17/17D21H17/69D21H17/68D21H17/14D21H17/29
CPCD21H17/14D21H17/17D21H17/29D21H17/68D21H17/69D21H21/16
Inventor 王慧丽陈学帅刘温霞于得海宋兆萍
Owner 山东熙来淀粉有限公司
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