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High-surface-strength paper surface sizing agent

A surface sizing agent and paper technology, applied in the direction of water repellent addition, etc., can solve problems such as complex operation, achieve good biocompatibility, easy film formation, and improve surface strength

Inactive Publication Date: 2019-11-05
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, aluminum sulfate needs to be added to strengthen the bond with the fiber, and the operation is more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Preparation of modified chitosan:

[0031] In a 1000ml four-necked flask with a condenser, a dropping device, a stirrer and a thermometer, add 32 grams of chitosan and 200 grams of 2% acetic acid solution by mass fraction, and stir to dissolve overnight. Add 50 grams of salicylaldehyde and react at 80°C for 6h. Adjust pH=7-8, add 50 grams of 10% NaBH 4 Aqueous solution, continue to stir for 2-3h.

[0032] 2. Preparation of surface sizing agent for paper:

[0033] Add 200 grams of modified chitosan and 384 grams of deionized water to a 1000 ml four-necked flask equipped with a condenser, a dropping device, a stirrer and a thermometer, heat up to 80° C. to dissolve, and cool to 45° C. Slowly add 73 g of 25 wt % stearyl polyoxyethylene (10) ether aqueous solution dropwise, and the dropwise addition is completed within 0.5 hr. Add 24.3 g of 25 wt % glycerin aqueous solution, stir for 0.5 hr, and then filter through a 100-mesh filter to obtain a surface sizing agent w...

Embodiment 2

[0035] 1. Preparation of modified chitosan:

[0036] In a 1000ml four-necked flask with a condenser, a dropping device, a stirrer and a thermometer, add 32 grams of chitosan and 200 grams of 2% acetic acid solution by mass fraction, and stir to dissolve overnight. Add 60 grams of salicylaldehyde and react at 85°C for 6h. Adjust pH=7-8, add 70 grams of 10% NaBH 4 Aqueous solution, continue to stir for 2-3h.

[0037] 2. Preparation of surface sizing agent for paper:

[0038] Add 100 grams of modified chitosan and 265 grams of deionized water to a 1000 ml four-neck flask equipped with a condenser, a dropping device, a stirrer and a thermometer, heat up to 80° C. to dissolve, and cool to 45° C. 42.95 g of 20 wt % stearyl polyoxyethylene (15) ether aqueous solution was slowly added dropwise, and the dropwise addition was completed within 0.5 hr. Add 19.52 g of 20 wt % pentaerythritol aqueous solution, stir for 0.5 hr and filter through a 100-mesh filter to obtain a surface sizi...

Embodiment 3

[0040] 1. Preparation of modified chitosan:

[0041] In the 1000ml four-neck flask with condenser, dropping device, stirrer, thermometer, add 42 grams of chitosan, 200 grams of acetic acid solution with a mass fraction of 2%, stir and dissolve overnight. Add 60 grams of salicylaldehyde and react at 85°C for 6h. Adjust pH=7-8, add 70 grams of 10% NaBH 4 Aqueous solution, continue to stir for 2-3h.

[0042] 2. Preparation of surface sizing agent for paper:

[0043] Add 100 grams of modified chitosan and 265 grams of deionized water to a 1000 ml four-neck flask equipped with a condenser, a dropping device, a stirrer and a thermometer, heat up to 80° C. to dissolve, and cool to 45° C. 42.95 g of 20 wt% AOE-9 aqueous solution was slowly added dropwise, and the dropwise addition was completed within 0.5 hr. Add 19.52 g of 20 wt % trihydroxypropane aqueous solution, stir for 0.5 hr, and then filter through a 100-mesh filter to obtain a surface sizing agent with a pH of 2.35 and a...

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Abstract

The invention discloses a high-surface-strength paper surface sizing agent. Modified chitosan is taken as an effective component. The modified chitosan has very well film-forming property, and can beconnected with paper fiber through a hydrogen bond. The paper surface sizing agent is a high-performance and environment-friendly product which can meet using of paper surface sizing. Surface sizing is conducted on a raw paper by the product together with starch, the surface strength can be significantly improved, and the Cobb value of the paper is not lowered. At the same time, the chitosan has the advantages that non-toxicity is achieved, degradation is easy, the biocompatibility is good, film-forming is easy, and antibacterial property is very high.

Description

technical field [0001] The invention relates to the field of papermaking surface sizing agents, in particular to a high-surface-strength paper surface sizing agent. Background technique [0002] The addition of surface sizing agent can improve the properties of paper sheets or increase the surface properties, strength and water resistance of paper or paperboard. [0003] According to the function of surface sizing agent, we can divide it into anti-water type and reinforcement type. The water-resistant surface sizing agent can be selected from alkyl ketene dimer (AKD), styrene-maleic anhydride copolymer, etc.; the reinforced type can be selected from starch, methyl cellulose, polyvinyl alcohol, etc. [0004] Requirements for the sizing agent used for the above-mentioned surface sizing: a) improve the water resistance of the paper; b) enhance the surface performance of the paper; c) fast curing speed, requiring that it can be cooked immediately after getting off the machine. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
CPCD21H21/16
Inventor 施晓旦谢中怡尹东华金霞朝
Owner SHANGHAI DONGSHENG NEW MATERIALS
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