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Preparation method of liquid fluorescent brightener for papermaking

A technology of fluorescent whitening agent and liquid, which is applied in the preparation of liquid fluorescent whitening agent for papermaking and the preparation of tetrasulfonic acid liquid fluorescent whitening agent for papermaking, can solve problems such as unstable product quality and achieve performance indicators Stable and reliable, stable and reliable process, the effect of reducing the impact

Inactive Publication Date: 2017-03-08
山西青山化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the problem of unstable product quality caused by the unstable pH of the system in the prior art, the present invention provides a preparation method of a tetrasulfonic acid liquid fluorescent whitening agent with stable quality for papermaking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step (1): Add 300g of crushed ice and 300g of water to a 2000ml beaker, cool in an ice bath, add 30g of cyanuric chloride, stir and beat for 1.5 hours. 30g of p-aminobenzenesulfonic acid was added in one go, stirred for 10min, and 180g of 10% Na 2 CO 3 The solution was added to the above solution at a constant speed within 2.5 hours, the temperature was 5°C, and Na 2 CO 3 After the solution is added, the temperature rises to 10°C and reacts until the amino group value disappears;

[0041] Step (2): 27g of DSD acid and 120g of 10% NaOH solution were mixed and stirred until the solution was clear and translucent to obtain DSD-NaOH solution;

[0042] Step (3): Add the DSD-NaOH solution prepared in step (2) to the solution obtained in step (1) within 1.5 hours, slowly increase the temperature from 15°C to 40°C, keep warm until the amino value disappears, and then Step reaction ends;

[0043] Step (4): Add 25g of diethanolamine to the solution obtained in step (3), stir...

Embodiment 2

[0046] In step (1), replace Na with 140g of 10% NaOH solution 2 CO 3 Solution, other operation process is with embodiment 1.

Embodiment 3

[0048] According to the relevant provisions of GB / T 23979.2-2009 "Measurement of Whitening Intensity and Shade of Fluorescent Whitening Agents", the whitening effect of the whitening agents prepared in the above examples was tested.

[0049] Carry out multiple batches of repeated tests, carry out the addition test in the pulp, compare the whiteness and shade of the finished paper, and investigate the stability of the sample quality. The test data is as follows:

[0050] example CIE Whiteness L* a* b* Example 1 sample 108.3 98.3 1.31 -0.84 Example 1 sample 2# 108.1 98.2 1.30 -0.83 Example 1 Sample 1# 108.1 98.4 1.34 -0.83 Example 1 sample 2# 108.4 98.3 1.34 -0.84 Example 2 Sample 1# 108.7 98.5 1.39 -0.80 Example 2 Sample 2# 108.7 98.1 1.38 -0.82 Example 2 Sample 1# 108.4 98.1 1.38 -0.82 Example 2 Sample 2# 108.5 98.2 1.36 -0.83

[0051] It can be seen from the above data that the quality o...

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Abstract

The invention discloses a universal preparation method of a tetrathionate liquid fluorescent brightener which is used for papermaking and stable in quality. The brightener is prepared from p-aminobenzenesulfonic acid, cyanuric chloride, 4,4-diaminostilbene-2,2-disulfonic acid and diethanolamine as raw materials through steps including synthesis through three steps of condensation reactions as well as desalination and filtration treatment with a nanofiltration membrane filtration method. The preparation method aims to solve the problem about how to reduce variations among batches of fluorescent brightener products prepared with a batch production process, the addition manner of an acid binding agent is improved thoroughly with the adoption of a fixed flow rate method, direct mixing of reactants and the acid binding agent and the like, intervention of human factors in the reaction process is greatly reduced on the basis of existing equipment, fluctuation of the pH value of the reaction system is effectively avoided, so that the raw materials are fully and completely reacted under the stable medium condition, and the product quality is fundamentally stabilized; the preparation method adopts a simple and implementable operation process and is applicable to a treatment process of all tetrathionate fluorescent brighteners.

Description

technical field [0001] The present invention relates to the technical field of chemical additives for papermaking, more specifically, to a method for preparing a liquid fluorescent whitening agent for papermaking, in particular to a tetrasulfonic acid liquid fluorescent whitening agent with stable quality for papermaking The preparation method of the agent. Background technique [0002] Paper whiteness is an important quality indicator for many paper products such as writing and printing. The residual lignin in the paper-making fiber raw materials has a chromogenic system, which makes the paper appear a certain yellow light. In order to obtain satisfactory whiteness of paper and improve the grade of paper products, it is necessary to use some physical or chemical methods for whitening treatment in the paper production process. In recent years, as a commonly used chemical additive, fluorescent whitening agent has a series of advantages such as less dosage, low cost, no effe...

Claims

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Application Information

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IPC IPC(8): C07D251/70C09K11/06D21H21/30D21H17/09
CPCC07D251/70C09K11/06C09K2211/1059D21H17/09D21H21/30
Inventor 李钢韩卫高飞
Owner 山西青山化工有限公司
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