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Preparation method of AKD microemulsion

A technology of microemulsion and emulsion, which is applied in the field of papermaking, can solve the problems of reduced activity of AKD molecules, demulsification of AKD emulsion, and reduced sizing effect, and achieve the effects of low surface tension, good stability, and energy saving

Active Publication Date: 2018-08-10
山东晨鸣纸业集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the temperature is too high, the AKD emulsion will be demulsified or hydrolyzed, which will greatly reduce the activity of AKD molecules, and its sizing effect will be significantly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 A kind of preparation method of AKD microemulsion

[0021] At room temperature, add 100kg of liquid AKD, 50kg of OP-10, 50kg of TX-4, and 1200kg of water into the emulsification tank, raise the temperature to 65°C, start stirring at a stirring speed of 300r / min, stir for 25 minutes, and slowly add polyethylene Diol 400; when the emulsion becomes clear and transparent, cool it down quickly and drop to room temperature in 1-2 minutes to obtain an O / W microemulsion. The rate of addition of the co-emulsifier is 40L / h.

[0022] The prepared emulsion: the surface tension is 42mN / m, and there will be no stratification when centrifuged in a centrifuge (speed 3000rpm / m) for 5 minutes.

[0023] Add this emulsion to the sizing starch on the surface of the paper machine, and the Cobb value can reach 32g / m according to the amount of 2-5kg per ton of paper 2 .

Embodiment 2

[0024] Embodiment 2 A kind of preparation method of AKD microemulsion

[0025] At room temperature, add 187.5kg of liquid AKD, 50kg of OP-10, and 75kg of TX-4 into the emulsification tank to obtain a mixture, and raise the temperature to 70°C;

[0026] Preheat 2500kg of water to 65°C and add it to the above mixture;

[0027] Turn on the stirring device of the emulsification tank, the stirring speed is 400r / min, and stir for 28 minutes;

[0028] Slowly add polyethylene glycol dropwise during stirring until the emulsion becomes clear and transparent, cool it rapidly, and drop it to room temperature in 1-2 minutes to obtain an O / W microemulsion. The dripping rate of polyethylene glycol is 40L / h.

[0029] The prepared emulsion: the surface tension is 40mN / m, and there will be no stratification when centrifuged in a centrifuge (speed 3000rpm / m) for 5 minutes.

[0030] Add this emulsion to the sizing starch on the surface of the paper machine, and the Cobb value can reach 30g / m a...

Embodiment 3

[0031] Embodiment 3 A kind of preparation method of AKD microemulsion

[0032] At room temperature, add 300kg AKD wax flakes, 50 kgOP-10, 100kgTX-4 into the emulsification kettle to obtain a mixture, and raise the temperature to 75°C;

[0033] Preheat 4500kg of water to 65°C and add to the above mixture;

[0034] Turn on the stirring device of the emulsification tank at a stirring speed of 500r / min, and stir for 30 minutes. During the stirring process, slowly add polyethylene glycol dropwise until the emulsion becomes clear and transparent, cool it quickly, and cool it down to room temperature in 1-2 minutes to obtain an O / W microemulsion . The dripping rate of polyethylene glycol is 40L / h.

[0035] The prepared emulsion: the surface tension is 38.5mN / m, and there will be no stratification when centrifuged in a centrifuge (speed 3000rpm / m) for 5 minutes.

[0036] Add this emulsion to the sizing starch on the surface of the paper machine, the amount per ton of paper is 2-5kg...

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Abstract

The invention discloses a preparation method of an AKD microemulsion. The method comprises the steps of: mixing liquid AKD, an emulsifier and water at room temperature, and conducting heating meltingto obtain a mixture; stirring the mixture under a speed of 300-500r / min for 25-30min to form an emulsion; and adding a co-emulsifier dropwise in the stirring process until the emulsion becomes clear and transparent, and then performing cooling so as to obtain the AKD microemulsion. The AKD microemulsion prepared by the preparation method provided by the invention has the advantages of good stability, storability, small surface tension and the like.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a preparation method of AKD microemulsion. Background technique [0002] Since 2016, the cost of papermaking raw materials has been rising. In order to reduce the cost of papermaking and increase the profit of paper, various paper mills are reducing costs in sizing, and AKD is favored by papermaking companies because of its good sizing effect and low price. The development prospect is very broad. [0003] In recent years, AKD is mostly based on fast-ripening AKD emulsion prepared by polymer emulsifier. Compared with starch-type AKD emulsion, its retention rate on fiber and reaction rate with fiber have been significantly improved. It can Reduce the amount of AKD sizing agent, shorten the sizing curing time, and improve the sizing effect. [0004] However, polymer emulsified AKD also has shortcomings, mainly stability issues, which has become a consensus in the industry. How to impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/14D21H19/54D21H19/46D21H19/62D21H21/16
CPCD21H19/14D21H19/46D21H19/54D21H19/62D21H21/16
Inventor 张伟宋晓明张革仓陈夫山黄建林王鲁燕胡艳君
Owner 山东晨鸣纸业集团股份有限公司
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