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A kind of starch emulsifier, preparation method and anionic akd surface sizing agent prepared by using the emulsifier

A surface sizing agent and emulsifier technology, applied in the direction of water repellent addition, papermaking, coating, etc., can solve problems such as paper defects, increased cost of additive dosage, and affect paper quality, so as to improve printing suitability and increase The effect of surface strength and excellent compatibility

Active Publication Date: 2022-06-24
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when surface sizing, there is no influence of press filtration and white water reflux, and 100% is retained. Many surface sizing aids are anionic, which is easy to react with cationic AKD emulsion, which increases the amount of additives and increases the cost. At the same time, it may It will cause paper defects and affect paper quality

Method used

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  • A kind of starch emulsifier, preparation method and anionic akd surface sizing agent prepared by using the emulsifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) preparation of starch emulsifier:

[0023] In a four-necked flask equipped with a condenser, agitation and a thermometer, add 185g deionized water, 4g sorbitan monooleate (Span 80), 1g α-amylase and 100g cornstarch, heat up to 60°C, keep warm 1h, add slow solvent anhydrous sodium sulfate 5g under stirring, add sodium hydroxide with a weight concentration of 32% until the pH of the solution is 11.0, add 10g of water to dissolve 7g of chloroacetic acid in another beaker, and then add it to the starch milk, the reaction 4h, the pH of the system was adjusted to 4.0 with hydrochloric acid. Cool down to below 30°C, filter and discharge.

[0024] (2) Preparation of anionic AKD surface sizing agent:

[0025] In a four-necked flask equipped with a condenser, agitation and a thermometer, add 50g of starch emulsifier and 100g of water, heat up to 75°C, add 100g of molten AKD original powder, stir at high speed for 20 minutes, pour into a high-pressure homogenizer at 40MPa Q...

Embodiment 2

[0027] (1) preparation of starch emulsifier:

[0028] In a four-necked flask equipped with a condenser, stirring and a thermometer, add 150g deionized water, 10g polyethylene oxide (20), 1g β-amylase and 100g corn starch, heat up to 55°C, keep the temperature for 2h, and add a slow solvent under stirring 8g of sodium chloride, add sodium hydroxide with a weight concentration of 32% until the pH of the solution is 12.0, add 10g of water to dissolve 9g of chloroacetic acid in another beaker, then add it to the starch milk, react for 6h, and adjust the pH of the system with phosphoric acid to 3.0. Cool down to below 30°C, filter and discharge.

[0029] (2) Preparation of anionic AKD surface sizing agent:

[0030] In a four-necked flask equipped with a condenser, agitator, and a thermometer, add 40g of starch emulsifier and 100g of water, raise the temperature to 80°C, add 100g of molten AKD raw powder, stir at high speed for 10 minutes, and pour it into a high-pressure homogeni...

Embodiment 3

[0032] (1) preparation of starch emulsifier:

[0033] In a four-necked flask equipped with a condenser tube, agitation, and a thermometer, add 170 g of deionized water, 8 g of sorbitan monolaurate (Span 20), 1 g of γ-amylase-amylase and 100 g of wheat starch, and heat up to 45 ℃, keep the temperature for 2h, add 5g of slow solvent anhydrous sodium sulfate under stirring, add sodium hydroxide with a weight concentration of 32% until the pH of the solution is 12.5, add 10g of water to another beaker to dissolve 10g of chloroacetic acid, and then add it to the starch milk During the reaction for 5h, the pH of the system was adjusted to 4.0 with acetic acid. Cool down to below 30°C, filter and discharge.

[0034] (2) Preparation of anionic AKD surface sizing agent:

[0035] In a four-necked flask equipped with a condenser, agitation and a thermometer, add 50g of starch emulsifier and 100g of water, heat up to 75°C, add 100g of molten AKD original powder, stir at high speed for 2...

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Abstract

The invention discloses a starch emulsifier. The parts by weight of each component are as follows: 30-40 parts of starch, 30-6 parts of emulsifier, 0.1-0.4 parts of amylase, 1-3 parts of slow solvent, and 0.5-2.0 parts of catalyst , 4-8 parts of chloroacetic acid, 1-3 parts of neutralizer and water. The preparation method is to mix starch, emulsifier, amylase and water to obtain starch milk, raise the temperature, add slow solvent and catalyst, then add chloroacetic acid to fully react, adjust the pH value of the system with neutralizer, and obtain starch emulsifier. The present invention also provides an anionic AKD surface sizing agent, which is prepared by mixing starch emulsifier and water, heating up, adding AKD raw powder under high-speed stirring, and then adding it into a high-pressure homogenizer to homogeneously cool and discharge the material. . The anionic AKD surface sizing agent of the present invention can have excellent compatibility with anionic additives, and at the same time significantly reduce the water absorption value, increase the surface strength of paper, and effectively improve the printing suitability.

Description

technical field [0001] The invention relates to the technical field of preparation of AKD surface sizing agents, in particular to a starch emulsifier, a preparation method thereof, and an anionic AKD surface sizing agent prepared by using the emulsifier. Background technique [0002] The purpose of sizing is to make paper or paperboard resistant to liquid diffusion and penetration, so that it is suitable for writing and moisture resistance. In this process, the neutral sizing agent AKD has received extensive attention due to its good properties. [0003] When sizing in the pulp, it is necessary to use a cationic emulsifier to make AKD have a positive charge, and it will adsorb on the fiber and react with it to produce a sizing effect. However, during surface sizing, there is no influence of pressing filtration and white water reflux, and 100% is retained. Many surface sizing additives are anionic, which are easy to react with cationic AKD emulsions, which increases the amou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16D21H19/14D21H19/24D21H19/54D21H19/62D21H19/46
CPCD21H21/16D21H19/14D21H19/24D21H19/54D21H19/62D21H19/46
Inventor 施晓旦沈安成金霞朝
Owner SHANGHAI DONGSHENG NEW MATERIALS
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