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A cationic water-based fluorescence eliminating agent

A kind of fluorescence elimination agent, cationic technology, applied in the regeneration of pulping liquid, the addition of non-fiber pulp, papermaking, etc., can solve the problems of increasing the cost of waste paper recycling, limiting the use of chlorine and hypochlorite, etc., to achieve Eliminate fluorescent substances, low cost, and long-lasting effects

Active Publication Date: 2020-01-31
ZHEJIANG JIUBEN BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN102230291A discloses the use of chlorine dioxide as a fluorescence elimination agent for waste paper pulp. The bleaching and fluorescence removal of pulp are carried out simultaneously, but environmental regulations limit the use of chlorine and hypochlorite
And at present, there is no production and manufacturing technology of fluorescence elimination agent in China, and it is completely dependent on imports. The import price has greatly increased the cost of waste paper recycling, so it is urgent to develop high-efficiency fluorescence elimination agent

Method used

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  • A cationic water-based fluorescence eliminating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 90 parts of triethylenetetramine to a 1-liter four-necked flask equipped with a nitrogen gas introduction pipe, dropping device, stirring device, thermometer, water separator and condensing device, slowly add 105 parts of gallic acid and 2 parts of sulfuric acid under stirring , heat up to 130-150°C for 3 hours to obtain a prepolymer, add 51 parts of 2-hydroxyterephthalic acid under stirring, raise the temperature to 240°C for 6-10 hours and keep it for 1 hour, and react under negative pressure for 1 hour to obtain a polymer amides. Cool down to 120°C, add 40 parts of benzyl chloride for quaternization reaction for 4-10 hours, lower the temperature, adjust the pH value to 1-5 with 30% sulfuric acid, and adjust the content by adding water to obtain a 30% product with a viscosity of 100-400cps.

Embodiment 2

[0022] Add 150 parts of diethylenetriamine to a 1-liter four-neck flask equipped with a nitrogen gas introduction tube, dropping device, stirring device, thermometer, water separator and condensing device, slowly add 200 parts of salicylic acid under stirring, and add p-toluene 0.5 part of sulfonic acid, heat up to 110-130°C and keep it warm for 2 hours to obtain a prepolymer. Add 120 parts of isophthalic acid under stirring, raise the temperature to 230° C. for 4-10 hours and keep it warm for 2 hours to obtain polyamide. Cool down to 120°C, add 30% sulfuric acid to adjust the pH value to 1-5, add water to adjust the content, and obtain a 20-50% product with a viscosity of 8-30cps.

Embodiment 3

[0024] Add 113 parts of diethylenetriamine to a 1-liter four-neck flask equipped with a nitrogen gas inlet tube, dropping device, stirring device, thermometer, water separator and condensing device, slowly add 67 parts of malic acid and 3.6 parts of sulfuric acid while stirring , heat up to 110-130°C and keep warm for 1-2h to obtain a prepolymer. Add 170 parts of gallic acid under stirring, raise the temperature to 230°C for 6-10 hours and keep it warm for 2 hours to obtain polyamide. Cool down to 120°C, add 30% sulfuric acid to adjust the pH value to 1-5, and add water to adjust the content to obtain a 35% product with a viscosity of 15-20cps.

[0025] The experimental steps and experimental data of the fluorescence elimination method of the present invention are as follows: Utilize the fluorescence whiteness-non-fluorescence whiteness difference method to evaluate the fluorescence elimination effect of the fluorescence elimination agent prepared in Examples 1-3, and use the ...

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Abstract

The present invention provides a novel fluorescence elimination agent, and a preparation method and an application thereof. The novel fluorescence elimination agent uses an aromatic carboxylic acid-containing substances, polyamine or a polyamine prepolymer as raw materials, and under the action of a catalyst and under normal pressure or negative pressure, a polycondensation reaction is carried outat the temperature of 90-240 DEG C to prepare amide; then cationization is carried out at 25 to 120 DEG C, the pH of a system is adjusted to 1 to 5, the content is 20 to 50%, the viscosity is 10 to 500 cps, and the water-borne polyamide fluorescence elimination agent is obtained. The product prepared by the invention has low cost and water content. The invention provides the novel fluorescence elimination agent and the preparation method and the application thereof. The aromatic carboxylic acid-containing substance and polyamine or the polyamine prepolymer are used as the raw materials. The product is easy to use, the effect is long-lasting, and the cationic nature makes it close to a sulfonic acid group of a fluorescent whitening agent, which encapsulates and prevents the brightener molecules from moving. The structure of the fluorescence elimination agent contains aromatic substances and a hydrogen bonding structure that can effectively absorb ultraviolet rays and transfer energy, and the fluorescence elimination agent can prevent ultraviolet excitation of the fluorescent brighteners.

Description

technical field [0001] The invention relates to a cationic water-based fluorescence eliminating agent. Background technique [0002] my country is a big country in paper production and consumption, but forest resources are poor. Therefore, my country is vigorously developing the application of waste paper recycling and expanding the use of non-wood fibers. In 2016, the national paper and cardboard production volume was 108.55 million tons, the consumption volume was 104.19 million tons, and the per capita annual consumption volume was 75kg. From 2007 to 2016, the average annual growth rate of paper and paperboard production was 4.43%, and the average annual growth rate of consumption was 4.05%. In 2016, the total pulp consumption was 97.97 million tons, of which waste paper pulp was 63.29 million tons, accounting for 65% of the total pulp consumption, of which imported waste paper pulp accounted for 24%, and domestic waste paper pulp accounted for 41%. In 2016, a total of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/48D21C5/02D21C11/00D21H19/12D21H21/14
CPCC08G69/48D21C5/022D21C11/0021D21H19/12D21H21/14Y02W30/64
Inventor 张仿仿
Owner ZHEJIANG JIUBEN BIOCHEM