Preparation method of modified chitosan papermaking sizing agent

A technology of chitosan and sizing agent, applied in papermaking, textiles, papermaking, paper coating, etc., can solve the problems of affecting the health of front-line workers, non-biodegradable, expensive, etc., and achieve the reproducibility of printed products. Good, easily biodegradable, enhanced compounding properties

Inactive Publication Date: 2018-08-24
戴琪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention: the raw materials used in synthetic sizing agents are mostly petrochemical products with scarce resources and expensive prices, and mo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Take 10g of chitosan, add it to 200mL deionized water, adjust the pH to 3 with 2% acetic acid solution, stir at 300r / min for 20min, then add 10g of 5% sodium periodate solution, and react for 20 hours after shading Add 2.0g of ethylene glycol, continue to stir and react for 10min to obtain a reaction solution, add 20g of sodium chloride and 200g of absolute ethanol to the reaction solution, stir at 400r / min for 20min, let it stand for 1h, filter to obtain a filter residue, and redisperse the filter residue Precipitate in 200mL deionized water, and then use absolute ethanol. After repeating the operation twice, place the precipitate in a vacuum drying oven and dry at 30°C for 8 hours to obtain oxidized chitosan. Take 10g of collagen and 1.5g of maleic anhydride , added to 50g of cyclohexane, stirred and heated at 300r / min to 70°C for 2 hours, and then transferred to a rotary evaporator and distilled to dryness under reduced pressure to obtain modified collagen. Take 2.0g ...

example 2

[0029]Take 11g of chitosan, add 220mL of deionized water, adjust the pH to 3 with 2% acetic acid solution, stir at 350r / min for 25min, then add 11g of 5% sodium periodate solution, and react for 22 hours after shading Add 2.2g of ethylene glycol, continue to stir and react for 12min to obtain a reaction solution, add 22g of sodium chloride and 220g of absolute ethanol to the reaction solution, stir at 450r / min for 25min, let it stand for 1h, filter to obtain a filter residue, and redisperse the filter residue Precipitate in 250mL deionized water, and then use absolute ethanol. After repeating the operation twice, place the precipitate in a vacuum drying oven and dry at 35°C for 9 hours to obtain oxidized chitosan. Take 15g of collagen and 2.5g of maleic anhydride , added to 80g of cyclohexane, stirred and heated at 350r / min to 75°C for 2 hours, then transferred to a rotary evaporator and distilled to dryness under reduced pressure to obtain modified collagen. Take 2.2g Span-80,...

example 3

[0031] Take 12g of chitosan, add 240mL of deionized water, adjust the pH to 4 with 2% acetic acid solution, stir at 400r / min for 30min, then add 12g of 5% sodium periodate solution, and react for 24 hours after shading Add 2.4g of ethylene glycol, continue to stir and react for 15min to obtain a reaction solution, add 24g of sodium chloride and 240g of absolute ethanol to the reaction solution, stir at 500r / min for 30min, let stand for 2h and filter to obtain a filter residue, and redisperse the filter residue Precipitate in 300mL deionized water, and then use absolute ethanol. After repeating the operation 3 times, place the precipitate in a vacuum drying oven and dry at 40°C for 10 hours to obtain oxidized chitosan. Take 20g of collagen and 3.0g of maleic anhydride , added to 100g cyclohexane, stirred and heated at 400r / min to 80°C for 3 hours, then transferred to a rotary evaporator and distilled to dryness under reduced pressure to obtain modified collagen. Take 2.5g Span-8...

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PUM

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Abstract

The invention relates to a preparation method of a modified chitosan papermaking sizing agent, and belongs to the technical field of papermaking. According to the preparation method, sodium periodateis utilized to selectively oxidize chitosan for forming aldehyde groups, the compounding performance with other natural biopolymers is enhanced, crosslinking with anhydride pre-modified collagen is carried out through a Schiff base reaction, and a reaction with -OH of paper cellulose is carried out for forming covalent bonds, so that paper has stronger waterproof performance, and the waterproof performance of the papermaking sizing agent is effectively improved. In addition, the prepared papermaking sizing agent is environmentally friendly and easily biodegradable, and can be compounded and used with other synthetic papermaking sizing agents, so that the sizing effect is increased while the environmental pollution is reduced. The cation property in the sizing agent provided by the invention enhances the binding force with ink, and remarkably improves the printing quality of paper and the water washing resistance of printing ink. Compared with polyvinyl alcohol size press coated paper,the size press coated paper treated with the sizing agent has reduced water washing chromatic aberration of paper printing, increased printing color lump density, and excellent tone reproduction of print products.

Description

technical field [0001] The invention relates to a preparation method of a modified chitosan papermaking sizing agent, belonging to the technical field of papermaking. Background technique [0002] Paper and papermaking play an indispensable role in people's daily consumption. With the rapid development of the papermaking industry, how to balance resources, energy and the environment has become the key to the sustainable development of the papermaking industry. The development of papermaking chemical additives is undoubtedly a shortcut to promote the modernization of the papermaking industry, which can effectively reduce the cost of papermaking and greatly improve the quality of paper. A large proportion of papermaking additives is papermaking sizing agent, and most paper and paperboard need to be sizing to improve the physical and mechanical properties and water resistance and other liquid resistance of paper. [0003] Substances that make paper or paperboard liquid-resista...

Claims

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Application Information

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IPC IPC(8): D21H21/16D21H19/16D21H19/20
CPCD21H19/16D21H19/20D21H21/16
Inventor 戴琪王文新蔡静
Owner 戴琪
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