Preparation method of ultrawhite high-efficiency low-impurity fluorescent whitening agent
A fluorescent whitening agent and low-impurity technology, which is applied in the field of preparation of ultra-white high-efficiency low-impurity fluorescent whitening agent, can solve the problems of high impurity triazine content, poor cold water dispersibility, and low product bulk density. Low oxazine impurity content, high yellowing point, super white appearance of whitening agent
Active Publication Date: 2015-04-01
江苏晋光化工科技有限公司
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[0008] The present invention mainly aims at the problems of high impurity (triazine) content, low product bulk density, poor cold water dispersibility, poor solubility, and poor whitening effect in the traditional method for producing fluorescent whitening agents, and provides an ultra-white high-efficiency low-efficiency Preparation method of impurity fluorescent whitening agent
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Embodiment 1
[0026] Add 500L of water to the reaction kettle, add 800Kg of crushed ice, adjust the pH value to 1.5 with hydrochloric acid, throw 100Kg of cyanuric chloride, beat for 1 hour, and then add 100Kg of 4,4'-diaminostilbene- Add the disulfonic acid solution into the same reaction kettle within 2.5 hours, control the temperature at 3°C, adjust the pH value to 6 with a sodium carbonate solution with a mass fraction of 15%, carry out a shrinkage reaction until the amino value disappears, and use a 130-mesh stainless steel filter Filter, then transfer the material passing through the filter to the reactor, and then put 50.5Kg of aniline into the same reactor, and adjust the pH to 8 with a mass fraction of 25% sodium hydroxide solution to carry out the double shrinkage reaction When the amino value disappears, raise the temperature to 85°C, press filter after acting for 1 hour, put the obtained filter cake into an autoclave with 1300L deionized water, stir evenly and heat up to 65°C, th...
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The invention belongs to the technical field of auxiliary agents specially for washing and printing and dyeing, and particularly relates to a preparation method of an ultrawhite high-efficiency low-impurity fluorescent whitening agent. The preparation method mainly solves the problems of high impurity content, poor whitening effect, and the like of the traditional method for producing a fluorescent whitening agent. The preparation method of the ultrawhite high-efficiency low-impurity fluorescent whitening agent comprises the following steps of: firstly adding ice water to a reaction kettle, carrying out first polycondensation reaction on cyanuric chloride and a 4,4'-diaminobenzil-disulfonic acid solution; filtering by using a filter screen; transferring materials which pass through the filter screen into the reaction kettle; adding aniline for a second polycondensation reaction; increasing temperature to 80-90 DEG C; acting for 1-1.5 hours, then carrying out pressure filtration to obtain a filter cake, then uniformly stirring in a high-pressure kettle added with deionized water, and then increasing the temperature to 60-70 DEG C; adding morpholine and sodium hydroxide solids for a third polycondensation reaction; carrying out crystal transformation and pressure filtration, and drying to obtain the fluorescent whitening agent. The method disclosed by the invention has the advantages of low triazine impurity content, high stacking density, ultrawhite appearance of whitening agent, good whitening effect, and the like.
Description
technical field [0001] The invention belongs to the technical field of special auxiliary agents for washing and printing and dyeing, and in particular relates to a preparation method of an ultra-white, high-efficiency and low-impurity fluorescent whitening agent. Background technique [0002] Fluorescent whitening agent 71# is one of the most important fluorescent whitening agents in the structure of stilbene bistriazine whitening agents. It has a good whitening effect, and the products whitened by it can be kept for a long time without Yellowing, and has the advantages of high temperature resistance, alkali resistance, chlorine bleaching resistance, oxygen bleaching resistance, light resistance, etc. It is mainly used in synthetic detergents and printing and dyeing industries. However, the 71# fluorescent whitening agent produced by the traditional production process has the following disadvantages: [0003] (1) High content of impurities (triazine) (≥1%), [0004] That m...
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IPC IPC(8): C07D251/70C09B23/14C09K11/06
Inventor 李其伟刘健王庆陈丽娜高军
Owner 江苏晋光化工科技有限公司