Production technology of surface glueing starch with high reserving rate

A surface sizing starch and production process technology, applied in the direction of water repellent addition, etc., can solve the problems of paper mill wastewater pollution, poor fiber affinity, etc., and achieve the effect of improving paper surface strength, high retention rate, and improving surface strength

Inactive Publication Date: 2005-01-05
姚献平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The esterification reaction is an anionic reaction, which can improve the viscosity and stability of the starch paste, but has poor affinity for fibers and pollutes wastewater in paper mills.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-A

[0018] Embodiment 1-A circuit:

[0019] After mixing 20 parts of sodium hydroxide with a concentration of 25% and 22 parts of 3-chloro-2-hydroxypropyltrimethylammonium chloride with a concentration of 50%, join 500 parts of starch (on an absolute dry basis, wet The method uses 33-38% starch emulsion, and the semi-dry method uses 83-88% dry starch), so that they are fully mixed, the reaction temperature is controlled at 70-80°C, and the reaction time is 3 hours. The reaction product is cationic starch. The degree of substitution is 0.018, cooled to room temperature.

[0020] Take 10 parts of the prepared peracid solution, mix it with an appropriate amount of water, mix it evenly with the cationic starch prepared above, raise the temperature to 70°C, and react at this temperature for 2 to 3 hours, then check the viscosity of the starch every 10 minutes. When the viscosity reaches the specified value, stop the reaction.

[0021] Add 10 parts of stabilizer vinyl acetate. At the...

Embodiment 2-A

[0022] Embodiment 2-A circuit:

[0023]

Numbering

basic catalyst

Dosage (parts)

Etherifying agent / catalyst

(The molar ratio of)

Reaction time

(h)

temperature reflex

(℃)

Degree of substitution

(%)

2-1

28

1∶3.0

3

75

0.017

2-2

20

1∶2.0

3

75

0.018

2-3

10

1∶1.0

3

75

0.015

[0024] From the above results, changing the amount of basic catalyst within the specified range can bring the degree of substitution of the product to the specified range. At the same time, when the amount of basic catalyst is 20 parts, the process is optimally optimized.

[0025]

Numbering

Cationic etherification agent

Dosage (parts)

basic catalyst

Dosage (parts)

Reaction time

(h)

temperature reflex

(℃)

Degree of substit...

Embodiment 4-A

[0028] Embodiment 4-A circuit:

[0029]

[0030] From the above results, changing the amount of peracid chemicals within the specified range, the viscosity within the specified range to get the corresponding results. At the same time, when the amount of peracid chemical used was 10 parts, the viscosity obtained a moderate value.

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PUM

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Abstract

The invention relates to a high-retention surface glue-spreading starch producing process: 1), making cation etherification reaction and oxidation reaction; the cation etherification reaction adds in basic catalyst and cation etherifying agent in molar ratio of 1 to 1-3, mixing them fully and raising the temperature to 30-90 deg.C to react for 0.5-4 hours, so as to make the substitution degree of cation etherifying radicals at 0.010-0.025; the oxidation reaction adds in superacid chemical product in 0.1-1% of absolutely dry quantity of starches, controls pH value at 1-4, reacts at 40-90 deg.C for 0.5-5 hours to make starch viscosity reach the value needed, and terminating reaction; 2) making viscosity stabilization reaction; 3) after-processing to obtain the product. It can effectively improve surface strength, printing adaptability and brilliance of paper sheets and reduce the dosage of retaining and filtering auxiliaries and waste water flocculating agent, and also has the characters of simple producing process, high retention, etc.

Description

technical field [0001] The invention relates to a production process of high retention surface sizing starch. Background technique [0002] In order to endow the paper surface with good smoothness and strength, people often solve it by surface sizing modified starch, usually oxidized starch, but this kind of starch has poor affinity with fiber, and when broken paper is returned, most of it enters The white water system increases the BOD and COD values ​​of the system, which is very harmful to environmental protection. At the same time, it affects the Zeta potential of the system, which in turn affects the papermaking of the paper machine, and the surface strength is not good. Because cationic starch has a strong adsorption effect on anionic fibers and fillers, it can be well retained by fibers and effectively reduce environmental pollution. Therefore, domestic and foreign countries are competing to develop cationic starch suitable for paper surface sizing. However, due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
Inventor 姚献平郑丽萍田清泉
Owner 姚献平
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