Starch emulsifier, preparation method thereof, and anionic AKD surface sizing agent prepared from emulsifier

A technology of surface sizing agent and emulsifier, which is applied in the direction of water repellent addition, pigmented coating, coating, etc. It can solve the problems of affecting paper quality, increasing the cost of additive dosage, paper defects, etc., and achieves excellent compatibility properties, improve printability, and improve surface strength

Active Publication Date: 2020-05-08
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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  • Starch emulsifier, preparation method thereof, and anionic AKD surface sizing agent prepared from emulsifier
  • Starch emulsifier, preparation method thereof, and anionic AKD surface sizing agent prepared from emulsifier

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Preparation of starch emulsifier:

[0023] Add 185g of deionized water, 4g of sorbitan monooleate (Span 80), 1g of α-amylase, and 100g of cornstarch into a four-neck flask equipped with a condenser, stirring, and a thermometer, heat up to 60°C, and keep warm. 1h, add slow solvent anhydrous sodium sulfate 5g under stirring, add the sodium hydroxide that weight concentration is 32% to the pH of solution to be 11.0, add 10g water to dissolve 7g chloroacetic acid in another beaker, then join in the starch milk, react 4h, adjust the pH of the system 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] Add 50g of starch emulsifier and 100g of water into a four-necked flask equipped with a condenser, stirring and thermometer, heat up to 75°C, add 100g of molten AKD raw powder, stir at high speed for 20 minutes, pour into a high-pressure homogenizer at 40MPa Quality once, cool...

Embodiment 2

[0027] (1) Preparation of starch emulsifier:

[0028] Add 150g of deionized water, 10g of polyethylene oxide (20), 1g of β-amylase and 100g of cornstarch into a four-neck flask equipped with a condenser, agitator and a thermometer, raise the temperature to 55°C, keep it warm for 2 hours, and add a slow solvent while stirring Sodium chloride 8g, adding weight concentration is 32% sodium hydroxide to the pH of the solution is 12.0, add 10g water to dissolve 9g chloroacetic acid in another beaker, then join in the starch milk, react for 6h, 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] Add 40g of starch emulsifier and 100g of water to a four-necked flask equipped with a condenser, agitator, and a thermometer, raise the temperature to 80°C, add 100g of molten AKD raw powder, stir at high speed for 10 minutes, pour into a high-pressure homogenizer at 40...

Embodiment 3

[0032] (1) Preparation of starch emulsifier:

[0033] In a four-neck flask equipped with a condenser, stirring, and a thermometer, add 170g deionized water, 8g sorbitan monolaurate (Span 20), 1g γ-amylase-amylase and 100g wheat starch, and heat up for 45 ℃, keep warm for 2 hours, 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 12.5, add 10g water to dissolve 10g chloroacetic acid in another beaker, and then add it to starch milk During the reaction for 5 h, 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] Add 50g of starch emulsifier and 100g of water into a four-necked flask equipped with a condenser, stirring and thermometer, heat up to 75°C, add 100g of molten AKD raw powder, stir at high speed for 20 minutes, pour into a high-pressure homogenizer...

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Abstract

The invention discloses a starch emulsifier. The starch emulsifier comprises, by weight, 30-40 parts of starch, 30-6 parts of an emulsifier, 0.1-0.4 part of amylase, 1-3 parts of a slow solvent, 0.5-2.0 parts of a catalyst, 4-8 parts of chloroacetic acid, 1-3 parts of a neutralizer and water. A preparation method of the starch emulsifier comprises the following steps: mixing the starch, the emulsifier, amylase and water to obtain starch milk, heating, adding the slow solvent and the catalyst, adding chloroacetic acid, fully reacting, and regulating the pH value of the system by using the neutralizer to obtain the starch emulsifier. The invention also provides an anionic AKD surface sizing agent. The anionic AKD surface sizing agent is prepared by the following steps: mixing the starch emulsifier and water, heating, adding the AKD raw powder under high-speed stirring, adding the obtained mixture into a high-pressure homogenizer, and homogenizing, cooling and discharging the mixture. Theanionic AKD surface sizing agent has excellent compatibility with an anionic auxiliary agent, and can remarkably reduce the water absorption value, improve the surface strength of paper and effectively improves the printability.

Description

technical field [0001] The invention relates to the technical field of AKD surface sizing agent preparation, 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 the spread and penetration of liquids, suitable for writing and moisture-resistant. In this process, the neutral sizing agent AKD has received extensive attention due to its good performance. [0003] When sizing in the pulp, it is necessary to use a cationic emulsifier to make AKD have a positive charge, adsorb on the fiber and react with it to produce a sizing effect. 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 cos...

Claims

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Application Information

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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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