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Guar gum surface sizing agent and preparation method thereof

A technology of surface sizing agent and guar gum, which is applied in water-repellent addition, textile and papermaking, fiber raw material treatment, etc., can solve problems such as unstable sizing agent concentration, heavy workload, and poor printing strength of paper, and achieve Improve printing performance and printing strength, reduce paper fiber consumption, and reduce labor intensity

Active Publication Date: 2012-02-29
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The preparation process of this kind of sizing agent is complicated and the workload is heavy. First, cationic starch and polyvinyl alcohol glue should be prepared in their respective boiling glue barrels, filtered through an 80-mesh filter, and then the three glues should be mixed according to the process requirements. Mix and prepare the surface sizing agent in a glue mixing bucket, then pump it to the storage tank for storage, and finally pump it to the paper sizing machine to sizing the paper according to the needs of the paper type
There are many human-influenced factors in the glue-making agent prepared by this glue-making process, the glue concentration is unstable, the worker's operation intensity is high, when the paper is glued, the amount of glue applied is unstable, and the paper is processed in the printing factory. During printing, hair loss and powder loss often occur, and the surface printing strength of the paper is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a four-necked flask equipped with a thermometer, a mechanical stirrer, a nitrogen device and a dropping device, add 200 parts of ethanol, start stirring, add 200 parts of guar gum under stirring, and disperse for 10 minutes. 10 parts of prepared 20wt% peroxosulfuric acid aqueous solution was added dropwise in a four-necked flask, and the dropwise addition time was 20 minutes. After the dropwise addition, it was reacted at this temperature for 5 hours, and the pH of the reaction process system was 2.0. to room temperature to obtain oxidized guar gum;

[0019] Add 0.5 parts of vinyl acetate to the above reaction system, adjust the pH value of the solution to 8.0 with a 30% sodium hydroxide solution by weight, raise the temperature to 40°C, react for 1 hour, cool to 25°C, filter with suction, Wash, dry, and sieve to obtain the product of the present invention.

Embodiment 2

[0021] In a four-neck flask equipped with a thermometer, a mechanical stirrer, a nitrogen device and a dropping device, add 300 parts of ethanol, start stirring, add 200 parts of guar gum under stirring, and disperse for 10 minutes. 5 parts of prepared 25wt% aqueous solution of peracetic acid were added dropwise to a four-necked flask, and the time for adding was 30 minutes. After the addition was completed, the reaction was carried out at this temperature for 3 hours. The p H of the system during the reaction process was 3.0, cooled to room temperature to obtain oxidized guar gum;

[0022] Add 2 parts of sodium tripolyphosphate to the above reaction system, adjust the pH value of the solution to 6.5 with 20% sodium hydroxide solution by weight, raise the temperature to 40°C, react for 2 hours, cool to 25°C, and filter with suction , washing, drying, and sieving to obtain the product of the present invention;

Embodiment 3

[0024] In a four-neck flask equipped with a thermometer, a mechanical stirrer, a nitrogen device, and a dropping device, add 400 parts of ethanol, start stirring, add 200 parts of guar gum under stirring, and disperse for 5 minutes. 15 parts of the prepared 30wt% phosphoric acid peroxygen solution were added dropwise in a four-necked flask, and the time for adding was 45 minutes. After the addition was completed, the reaction was carried out at this temperature for 5 hours. Cool to room temperature to obtain oxidized guar gum;

[0025] Add 5 parts of succinic anhydride to the above reaction system, adjust the pH value of the solution to 7.0 with a 30% sodium hydroxide solution by weight, raise the temperature to 50°C, react for 1 hour, cool to 25°C, filter and wash with suction , drying, and sieving to obtain the product of the present invention.

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Abstract

The invention provides a guar gum surface sizing agent and a preparation method thereof. The preparation method comprises the following steps of: (1) dropwise adding an oxidant aqueous solution into an organic solvent containing guar gum raw powder, controlling the pH of a system to 2-4 after dropwise adding, and reacting to obtain guar gum oxide; and (2) adding a viscosity stabilizer into the guar gum oxide obtained in the step (1) with the amount which is 0.1-3 percent based on the oven dry weight of guar gum, adjusting the pH of the system to 6-8, reacting, and collecting the guar gum surface sizing agent from a reaction product. Due to the adoption of a paper surface sizing agent, the consumption of papermaking fiber can be lowered, the glue making process is simplified, the labor intensity is lowered, and the printing performance and the printing strength of the paper surface sizing can be improved; and the guar gum surface sizing agent has the advantages of small impurity content and convenience for applying during preparation of a glue solution.

Description

technical field [0001] The invention relates to a guar gum surface sizing agent and a preparation method thereof. Background technique [0002] There are many types of surface sizing agents used in the paper industry, which can be divided into natural polymer surface sizing agents and synthetic polymer surface sizing agents according to the source of chemicals. The more commonly used surface sizing agents are: natural polymer surface sizing agents That is: cationic starch, anionic phosphate starch, oxyalkyl starch, dialdehyde starch, acetate starch, enzyme-converted starch, acid-thinned starch, animal glue, modified cellulose, alginate, etc.; synthetic polymer surface Sizing agents include: polyvinyl alcohol (PVA), polyacrylamide (PAM), polyurethane, AKD, etc. [0003] At present, in the production of double offset printing paper, most of the surface sizing processes used are the preparation of natural polymer surface sizing agents and synthetic polymer sizing agents accord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H19/10
Inventor 施晓旦李改霞王养臣
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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