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Preparation method of rapidly-cured water-resistant AKD sizing agent

A water-resistant, sizing agent technology, applied in the directions of water repellent addition, non-fiber pulp addition, wax addition, etc., can solve the problems of easy hydrolysis failure, long aging period, poor AKD stability, etc., and achieve good retention and stability. Sizing effect, strong emulsifying and dispersing power, effect of increasing sizing degree

Inactive Publication Date: 2017-01-04
中山市升信纸品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: for the current common AKD sizing agent, because the reaction between AKD and cellulose hydroxyl group is a relatively slow process, unlike rosin soap, the hydrophobic group immediately sizing on the fiber, so there is aging Long period, lagging effect of sizing, and poor stability of AKD in water, easy hydrolysis failure, the present invention firstly uses cationic monomers to modify guar gum, and then blends the modified guar gum and vegetable oil, and reacts in microorganisms The self-made synergist is modified under the action of the synergist, and finally the synergist and other materials are compounded to obtain a fast-cooking water-resistant AKD sizing agent. The present invention utilizes the similar structure of guar gum and cellulose, and itself is rich in hydroxyl groups. It has a strong affinity with fibers and can form chemical bonds with fiber surface groups. After being modified by cationic monomers, it has a cationic charge, which makes it easier to attach to negatively charged fibers. After being modified by vegetable oil, it increases Increase the number of hydrophobic ester groups, avoid hydrolysis in contact with water, speed up the reaction between the sizing agent and the fiber, improve the effect of AKD sizing, and effectively solve the problem of long aging period of common AKD sizing agents, sizing The glue effect lags behind, and AKD has poor stability in water, and is prone to hydrolysis and failure problems. It has excellent sizing effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] Weigh 200g of guar gum and add it to a three-necked flask equipped with a stirrer and a thermometer and 1.6L of deionized water, then add 200mL of 30% sodium hydroxide solution to the flask, and move the flask into a water bath at 40°C In the pot, start the agitator and stir the reaction for 1h to obtain the alkali immersion guar gum suspension; in the above alkali immersion guar gum suspension, add 200mL mass concentration and be 60% dimethyl diallyl ammonium chloride solution and 1g peroxide For dicyclohexyl dicarbonate, nitrogen gas was passed through the flask at a rate of 3 mL / min for 20 min, and then the flask was transferred to a water bath at 60 ° C for 3 h with insulated stirring and reaction. Finally, the reaction product was transferred to a concentration tank and concentrated under reduced pressure to its original 1 / 3 of the volume to obtain cation-modified guar gum; mix soybean oil and the above-mentioned cation-modified guar gum in a mass ratio of 1:3 to ob...

example 2

[0020]Weigh 250g of guar gum and add it to a three-neck flask equipped with a stirrer and a thermometer and 1.7L of deionized water, then add 250mL of 30% sodium hydroxide solution to the flask, and move the flask into a water bath at 50°C In the pot, start the agitator and stir the reaction 1.5h to obtain the alkali immersion guar gum suspension; In the above-mentioned alkali immersion guar gum suspension, add 250mL mass concentration and be 60% dimethyl diallyl ammonium chloride solution and 1.5g For dicyclohexyl peroxydicarbonate, pass nitrogen gas into the flask at a rate of 3mL / min for 25min, then transfer the flask to a water bath at 65°C and keep stirring for 3.5h, then transfer the reaction product to a concentration tank and concentrate under reduced pressure to 1 / 3 of its original volume to obtain cation-modified guar gum; mix soybean oil and the above-mentioned cation-modified guar gum in a mass ratio of 1:3 to obtain a substrate and put it into a beaker, and the ino...

example 3

[0023] Weigh 300g of guar gum and add it to a three-necked flask with a stirrer and a thermometer and 1.8L of deionized water, then add 300mL of 30% sodium hydroxide solution to the flask, and move the flask into a water bath at 60°C In the pot, start the agitator and stir the reaction for 2h to obtain the alkali immersion guar gum suspension; in the above alkali immersion guar gum suspension, add 300mL mass concentration and be 60% dimethyl diallyl ammonium chloride solution and 2g peroxide For dicyclohexyl dicarbonate, pass nitrogen gas into the flask at a rate of 3 mL / min for 30 min, then move the flask into a water bath at 70°C to insulate and stir for 4 h, and finally transfer the reaction product to a concentration tank and concentrate under reduced pressure to its original concentration. 1 / 3 of the volume to obtain cation-modified guar gum; mix soybean oil and the above-mentioned cation-modified guar gum in a mass ratio of 1:3 to obtain a substrate and put it into a beak...

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Abstract

The invention discloses a preparation method of a rapidly-cured water-resistant AKD sizing agent, and belongs to the technical field of sizing agent preparation. The method includes the steps that firstly, guar gum is modified with cationic monomers; then, the modified guar gum and vegetable oil are blended, modification is carried out under the action of microorganisms, and a self-made synergist is obtained; finally, the synergist and other materials are compounded, and the rapidly-cured water-resistant AKD sizing agent is obtained. According to the preparation method, the characteristic that guar gum and cellulose have similar structures is utilized, the guar gum contains rich hydroxyl groups and has high affinity with fibers, and meanwhile the hydroxyl groups and fiber surface groups can form chemical bonding; besides, after modification with vegetable oil, the number of hydrophobic ester groups is increased, hydrolysis caused by contact with water can be avoided, reaction between the sizing agent and fibers is accelerated, the AKD sizing effect is improved, the problems that a common AKD sizing agent is long in curing time and delayed in sizing effect, and AKD is poor in stability in water and likely to be hydrolyzed and fail are effectively solved, and the AKD sizing agent has an excellent sizing effect.

Description

technical field [0001] The invention discloses a preparation method of a fast-ripening water-resistant AKD sizing agent, which belongs to the technical field of sizing agent preparation. Background technique [0002] Sizing is the process of making paperboard obtain water-resistant sizing agents. Sizing agents usually include saponified rosin glue, stearic acid glue, paraffin glue, paraffin rosin glue, asphalt glue, petroleum resin glue, etc., as well as synthetic Sizing materials such as alkyl ketene dimer, etc. Among the above-mentioned sizing materials, rosin sizing materials are used in the largest amount, and the sizing effect is best when dispersing rosin gum. Rosin glue can be divided into brown rosin glue, white rosin glue, strengthened rosin glue and dispersed rosin glue, etc. The sizing effect is best with dispersed rosin glue. Due to the large amount of paper used, the demand for sizing agents is also large. The limited resources of rosin have caused the price of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H17/17D21H17/32D21H17/11D21H17/60
CPCD21H17/11D21H17/17D21H17/32D21H17/60D21H21/16
Inventor 张静林茂平陆娜
Owner 中山市升信纸品有限公司
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