High-strength wet strength agent for papermaking and preparation method of wet strength agent

A wet strength agent and high-strength technology, which is applied in the field of high-strength papermaking wet strength agent and its preparation, can solve the problems of poor moisture resistance and low paper strength, and achieves improved wet strength, improved contact performance, and enhanced mechanical properties. Effect

Inactive Publication Date: 2019-07-12
吴义峰
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a high-strength paper-making wet-strength agent and its preparation method in view of the problems of low paper strength and poor moisture resistance after the current wet-strength agent is used

Method used

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  • High-strength wet strength agent for papermaking and preparation method of wet strength agent

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preparation example Construction

[0028] The preparation method of the reactive agent is as follows: taking p-hydroxymethyl benzaldehyde and adding citric acid and toluene in a mass ratio of 3-5:4-7, heating up to 50-60° C. and stirring and mixing for 20-50 min to obtain a mixed solution, and taking the mixed solution Add pyridine and aniline in a mass ratio of 10~20:1~3:0.5~1, heat up to 70~80°C, stir and mix for 1~3h, cool to room temperature to obtain a cooling substance, and take the cooling substance in a mass ratio of 10~20:5 ~7 Add potassium carbonate aqueous solution with a mass fraction of 25%, stir and mix at 20~25°C for 20~30min, adjust the pH to 2~3, filter, and take the precipitate, wash and dry with water to obtain the reactive agent.

[0029]The preparation method of the wet strength enhancing active agent is as follows: taking D-glucuronic acid in a mass ratio of 2~5:10~20, adding acetic acid-sodium acetate buffer of pH 6.0, stirring and mixing for 20~30min, to obtain a mixed solution a, Under ...

Embodiment 1

[0043] The preparation method of the reactive agent is as follows: taking p-hydroxymethylbenzaldehyde in a mass ratio of 3:4, adding citric acid and toluene, heating to 50° C., stirring and mixing for 20 minutes, to obtain a mixed solution, and taking the mixed solution in a mass ratio of 10:1:0.5 Add pyridine and aniline, heat up to 70 °C, stir and mix for 1 h, cool to room temperature to obtain a cooled product, take the cooled product and add 25% potassium carbonate aqueous solution in a mass ratio of 10:5, stir and mix at 20 °C for 20 minutes, adjust pH To 2, filter, take the precipitate, wash and dry with water to obtain the reactive agent.

[0044] The preparation method of the wet strength enhancing active agent is as follows: taking D-glucuronic acid in a mass ratio of 2:10, adding acetic acid-sodium acetate buffer with pH 6.0, stirring and mixing for 20 minutes, to obtain a mixed solution a, taking and mixing under aseptic conditions Liquid a was added with β-glucosid...

Embodiment 2

[0058] The preparation method of the reactive agent is as follows: take p-hydroxymethyl benzaldehyde, add citric acid and toluene in a mass ratio of 4:6, heat up to 55°C and stir and mix for 35 minutes to obtain a mixed solution, and take the mixed solution in a mass ratio of 15:2:0.7 Add pyridine and aniline, heat up to 75°C, stir and mix for 2 hours, cool to room temperature to obtain a cooling product, take the cooling product and add 25% potassium carbonate aqueous solution in a mass ratio of 15:6, stir and mix at 22 °C for 25 minutes, adjust pH to 2.5, filter, wash and dry the precipitate with water to obtain the reactive agent.

[0059] The preparation method of the wet strength enhancing active agent is as follows: taking D-glucuronic acid in a mass ratio of 4:15, adding acetic acid-sodium acetate buffer with pH 6.0, stirring and mixing for 25min, to obtain a mixed solution a, taking and mixing under aseptic conditions Liquid a was added with β-glucosidase and laccase i...

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Abstract

The invention discloses a high-strength wet strength agent for papermaking and a preparation method of the wet strength agent and belongs to the technical field of papermaking aids. P-hydroxy benzaldehyde and malonic acid are subjected to a decarbonation condensation reaction, a wet strength enhanced active agent and an intermediate in the generation process of phenyl methyl ester bonds are subjected to an addition reaction, and the wet strength is improved. A cation group is introduced to form adsorption with the fiber surface containing negative charge, and the contact performance of the wetstrength agent for paper is improved. A ketone carbonyl crosslinking agent adipic dihydrazide is added, polyurethane can be self-crosslinked in or on the surface of a material, the wet strength is improved and firm hydrophobic networks are formed by use of better waterproof property of polyurethane and introduction of self-repairing oxime bonds for modification, wollastonite is supplemented, theoptical properties such as opaqueness, covering power and the like of paper are improved, and the internal strength of paper fiber is improved. The problems that the paper strength effect is small andthe wet resistance is poor after the wet strength agent is used at present are solved.

Description

technical field [0001] The invention belongs to the technical field of papermaking auxiliaries, in particular to a high-strength papermaking wet strength agent and a preparation method thereof. Background technique [0002] As a raw material for papermaking, cellulose has the characteristics of hydrophilicity. After the paper is wetted with water, cellulose will lose its corresponding strength. In the process of industrial papermaking, if a wet strength agent is added, the wet strength of the paper can be significantly improved. tensile strength. Wet strength agent is an important papermaking chemical that can not only improve the quality of paper sheets, but also make irreversible changes in the dry strength of paper sheets in the dry state and the wet strength after wetting. A long time ago, the method of imparting wet strength to paper was to put the paper in sulfuric acid to make it parchmented. After parchmentation, the fibers of the parchmented paper were denatured an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/20
CPCD21H21/20
Inventor 吴义峰
Owner 吴义峰
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