High-water-resistance alkyl ketene dimer (AKD) emulsion and preparation method thereof

An emulsion and high-resistance technology, applied in the field of papermaking, can solve the problems of wasting water resources and energy, low solid content of the emulsion, and low sizing efficiency, and achieve the effects of simplifying the process, excellent water resistance, and high sizing efficiency.

Active Publication Date: 2019-04-12
山东同创精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main problems in the preparation of AKD emulsion are that the solid content of the emulsion is not high, waste of water resources and energy, low sizing efficiency, and serious pollution

Method used

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  • High-water-resistance alkyl ketene dimer (AKD) emulsion and preparation method thereof
  • High-water-resistance alkyl ketene dimer (AKD) emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Add 20 parts of palm wax into the reaction kettle, heat up to 60°C, after the palm wax melts, add 80 parts of boiling water, 1 part of corn starch, and 3 parts of compound emulsifier in a nitrogen protective atmosphere, 500rpm, Stir for 20 minutes;

[0036] (2) After the solution is completely mixed evenly, raise the temperature to 90°C, add 40 parts of AKD flakes, 5 parts of acrylic acid, 7 parts of sodium hydroxide, slowly add 3 parts of ammonium persulfate dropwise, 1000rpm, and stir for 5 hours;

[0037] (3) After the reaction is finished, the temperature is lowered to normal temperature, and the pH of the solution is adjusted with dilute hydrochloric acid, so that the emulsion is neutral, that is, the highly water-resistant AKD emulsion can be obtained.

[0038] The preparation method of the described compound emulsifier is: add 1 part of soybean lecithin, 2 parts of sucrose ester to 5 parts of water, add 0.1 part of guar gum, 0.2 part of water-soluble amino ac...

Embodiment 2

[0040] (1) Add 30 parts of peak wax into the reaction kettle, heat up to 90°C, after the beeswax melts, add 100 parts of boiling water, 3 parts of potato starch, 5 parts of compound emulsifier, 1000rpm, stir 30 minutes;

[0041] (2) After the solution is completely mixed evenly, raise the temperature to 100°C, add 50 parts of AKD flakes, 10 parts of acrylic acid, 9 parts of sodium hydroxide, slowly add 5 parts of potassium persulfate dropwise, 1500rpm, and stir for 10 hours;

[0042] (3) After the reaction is finished, the temperature is lowered to normal temperature, and the pH of the solution is adjusted with acetic acid to make the emulsion neutral, and the high water-resistant AKD emulsion can be obtained.

[0043] The preparation method of described compound emulsifier is: add 3 parts of soybean lecithin, 4 parts of sucrose ester to 10 parts of water, add 0.3 part of guar gum, 0.5 part of water-soluble amino acid, stir with homogenizer, 5000rpm, 8 minutes, A mixed emulsi...

Embodiment 3

[0045] (1) Add 25 parts of palm wax to the reaction kettle, heat up to 80°C, after the palm wax melts, add 90 parts of boiling water, 2 parts of sodium lignosulfonate, and 4 parts of compound emulsifier in a nitrogen protective atmosphere , 800rpm, stirring for 25 minutes;

[0046] (2) After the solution is completely mixed evenly, raise the temperature to 100°C, add 45 parts of AKD flakes, 7 parts of acrylic acid, and 8 parts of sodium hydroxide, slowly add 4 parts of tert-butyl peroxide dropwise, 1500 rpm, and stir for 7 hours;

[0047] (3) After the reaction is finished, the temperature is lowered to normal temperature, and the pH of the solution is adjusted with citric acid to make the emulsion neutral, and the high water-resistant AKD emulsion can be obtained.

[0048] The preparation method of the described compound emulsifier is: add 2 parts of soybean lecithin, 3 parts of sucrose ester to 8 parts of water, add 0.2 part of guar gum, 0.4 part of water-soluble amino acid,...

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Abstract

The invention discloses a high-water-resistance alkyl ketene dimer (AKD) emulsion and a preparation method thereof. The preparation method comprises the following steps: (1) adding 20-30 parts of biological wax into a reaction kettle, carrying out heating to 60-90 DEG C, adding 80-100 parts of boiling water, 1-3 parts of a stabilizer and 3-5 parts of a compound emulsifier in a nitrogen protectiveatmosphere after the biological wax is melted, and carrying out stirring for 20-30 minutes at a stirring speed of 500-1000 rpm; (2) carrying out heating to 90-100 DEG C after the solution is completely and uniformly mixed, adding 40-50 parts of AKD sheets, 5-10 parts of acrylic acid and 7-9 parts of sodium hydroxide, slowly and dropwise adding 3-5 parts of an initiator, and carrying out stirring for 5-10 hours at a stirring speed of 1000-1500 rpm; and (3) carrying out cooling to the normal temperature after the reaction is finished, and adjusting the pH value of the solution by using a diluteacid to enable the emulsion to be neutral, so that the high-water-resistance AKD emulsion can be obtained. According to the high-water-resistance AKD emulsion provided by the invention, the preparation process is simple and mature, production cost is low, environment friendliness is achieved, and operation is easy to control. The obtained high-water-resistance AKD emulsion is high in sizing efficiency, high in curing speed and low in slip coefficient, energy consumption and the environmental pollution can be reduced, and water resistance effect is excellent.

Description

technical field [0001] The invention relates to an auxiliary agent for papermaking, in particular to the preparation of a highly water-resistant AKD emulsion, and belongs to the technical field of papermaking. Background technique [0002] In recent years, my country's paper industry has overcome many unfavorable factors brought about by the global economic crisis, and has achieved both output and consumption increases. Rapid development puts forward higher requirements for sizing agents, and the development and utilization of new surface sizing agents is imminent, which is a hot spot in current research. [0003] AKD is an unsaturated lactone. The product is a waxy solid insoluble in water, with a melting point of about 51-52°C. AKD used in papermaking sizing agent must be made into emulsion. The particle size of the product is about 0.5-2μm. The emulsion is white and easily hydrolyzed, so the general storage period is short, only 3-6 months. [0004] At present, the main ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F220/06C08F2/44D21H19/14D21H19/44D21H19/58D21H19/46D21H21/16
CPCC08F2/44C08F289/00D21H19/14D21H19/44D21H19/46D21H19/58D21H21/16C08F220/06
Inventor 丁来民崔孝君
Owner 山东同创精细化工有限公司
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