Process for producing hexa-sulphonic acid liquid fluorescent whitening agents

A technology of fluorescent whitening agent and hexasulfonic acid, which is applied in the field of special additives for papermaking, can solve the problems of insufficient reactivity, dark paper surface, low maximum whiteness, etc., to save raw material consumption, improve poor stability, Good storage stability

Active Publication Date: 2009-05-13
ZHEJIANG TRANSFAR WHYYON CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The products obtained by adopting this traditional process, when applied to paper, the maximum whiteness is not high, the shade is blue light, the surface of the paper is dark, and the reactivity is not high enough.

Method used

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  • Process for producing hexa-sulphonic acid liquid fluorescent whitening agents
  • Process for producing hexa-sulphonic acid liquid fluorescent whitening agents
  • Process for producing hexa-sulphonic acid liquid fluorescent whitening agents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Chemical Name Feeding quantity (g) Cyanuric chloride 20 Aniline-2,4 / 5-disulfonic acid (molar ratio 2 / 8) 5.9 / 23.7 DSD acid 19.1 Morpholine 10.8 30% liquid alkali 72

Embodiment 2

[0029] Chemical Name Feeding quantity (g) Cyanuric chloride 20 Aniline-2,4 / 5-disulfonic acid (molar ratio

Embodiment 3

10.4 / 19.2 DSD acid 19.1 Morpholine 10.8 30% liquid alkali 72

[0032] The synthetic steps of three-component hexasulfonic acid liquid optical brightener are as follows:

[0033] (1) One-step reaction: add 300ml of water in a three-necked flask, use an ice bath to cool, and the cooling temperature is 0-4°C, then add cyanuric chloride (hereinafter referred to as CNC), 30% liquid caustic soda and aniline-2,4 -disulfonic acid and aniline-2,5-disulfonic acid are stirred and reacted, the pH value is controlled below 2.5, the temperature is 0-4° C., and the reaction end point is judged by an amino indicator.

[0034] (2) Two-step reaction: Add DSD acid with a molar ratio of 0.47 to CNC, control the pH value to 6.0-7.0, the temperature is 40-50°C, and use the amino indicator to judge the end point.

[0035] (3) Three-step reaction: add morpholine with a molar ratio of 1.15 to CNC, control the pH value at 8.5-10.5, keep the temperature at 90-110° C., and keep war...

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Abstract

The invention discloses a preparation method for 6-sulfonic acid liquid fluorescent brightener. In the prior art, cyanuric chloride, DSD acid, sulfanilic acid and diethanolameine are subjected to three-step condensation to obtain the optical brightener; and when the fluorescent brightener is applied to paper, the highest whiteness is not high, the chromatic light is cyan light, the surface of the paper is dark and the reactivity is not high. The preparation method comprises the following steps: a) aniline-2, 4-disulfonic acid and aniline-2, 5-disulfonic acid are reacted with the cyanuric chloride to obtain a mixture of benzene-2, 4-(4, 6-dichlorotriazine-2-amino) disulfonic acid and benzene-2, 5-(4, 6-dichlorotriazine-2-amino) disulfonic acid; and b) the mixture obtained in step a) and 4,4-diaminostilbene-2,2-disulfonic acid firstly undergo the second step condensation, the obtained product and drewamine undergo the third step condensation, and finally the 6-sulfonic acid liquid fluorescent brightener composition is obtained. The product of the invention has the function of compounding enhanced effect, solves the problem of poor stability of single component and greatly improves the yield and quality.

Description

technical field [0001] The invention relates to a special auxiliary agent for papermaking, in particular to a preparation method of a hexasulfonic acid liquid fluorescent whitening agent. Background technique [0002] After China's accession to WTO, my country's paper industry has undergone tremendous changes, requiring high-grade, environmentally friendly, professional refinement and continuous addition of paper whitening agents. First, at this stage, in terms of molecular structure, the types of brighteners used in China are mainly disulfonic acid groups and tetrasulfonic acid groups, and disulfonic acid brighteners are mainly used for pulp whitening of paper. White, due to the low yellowing point, cannot meet the whiteness requirements of high-grade paper. Second, in the process of modern papermaking technology, papermaking sizing agents partially replace or completely replace the evolution of internal pulp sizing. Therefore, it is of great social significance to synthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B23/14C09K11/06D21H21/30
Inventor 蔡定汉竹百均范约明冯新丽
Owner ZHEJIANG TRANSFAR WHYYON CHEM
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