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A pigment yellow and pigment technology, which is applied in the field of pigment preparation, can solve the problems such as the effect is not very obvious, and achieve the effect of bright color, easy dispersion and good coloring effect
Active Publication Date: 2009-03-11
宇虹颜料股份有限公司
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Generally, surfactants are added for mo...
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Embodiment 1
[0031] exist figure 1 , 2 In, the preparation method of Pigment Yellow 83, it is water 200ml, add 30% hydrochloric acid 8.6g, 3,3'-dichlorobenzidine 4.7g, 3,3'-dimethylbenzidine 0.094g, stir to dissolve 0.5 h, add ice and cool down to 3°C, add 9.67g of 30% sodium nitrite, carry out diazotization reaction for 0.5h, use sulfamic acid to remove excess nitrous, and prepare diazonium salt for later use.
[0032] 200ml of water and 2.8g of sodium hydroxide were heated up to 35°C, 11.6g of 4-chloro-2,5-dimethoxyacetylacetanilide was added and stirred until clear to obtain a solution of the coupling component.
[0033] Add 200ml of water, add 5.3g of glacial acetic acid, 0.2g of ethylenediaminetetraacetic acid, add 0.1g of Pingpingjia O, 0.1g of Zhakai powder, 2.0g of xylene and 20g of water and mix well, and stir evenly. Put the coupling component solution in 0.5h for acid analysis, the acid analysis temperature is 20°C, add 2.4g of sodium acetate to prepare the coupling solution. ...
Embodiment 2
[0036] The preparation of diazonium salt is with embodiment 1.
[0037] 200g of water and 2.8g of sodium hydroxide were heated up to 40°C, 11.6g of 4-chloro-2,5-dimethoxyacetylacetanilide was added, stirred until clear, and a solution of the coupling component was obtained.
[0038] Add 200g of water, add 5.3g of glacial acetic acid, 0.3g of ethylenediaminetetraacetic acid, add 0.15g of Pingpingjia O, 0.1g of pull-off powder, 3.0g of xylene and 20g of water and mix well, and stir evenly. Put the solution of the coupling component in 0.5h for acid analysis, the acid analysis temperature is 30°C, add 2.4g of sodium acetate after analysis to obtain the coupling solution. The pH value of the coupling solution is 5-6.
[0039] Add the diazonium salt dropwise into the coupling solution in 4 hours, the coupling temperature is 30°C, the pH value after the coupling is 3~4, add the emulsion dissolved by Pingpingjia OS-15 0.1g, solsperse17000 0.3g and water 10g, and stir to react 1h, h...
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Abstract
The invention provides a method for preparing pigment yellow 83. The method comprises the following steps: 3, 3'-dichlorobenzidine, 3, 3'-dimethylbenzidine, hydrochloric acid and water are stirred, dissolved and added to sodium nitrite for diazotization, so as to obtain a diazonium solution; a sodium hydroxide solution containing 4-chlorine-2, 5-dimethoxy acetyl acetanilide is dripped into an acetic acid solution at the temperature between 20 and 40 DEG C, so as to prepare a coupling solution; the acetic acid solution contains an emulsion formed by well mixing anionic surfactant, nonionic surfactant, solvent and water; the diazonium solution is dripped into the coupling solution within 1 to 5 hours; the emulsion formed by compounding the anionic surfactant and non-polar hyper-dispersant is added to the coupling solution, reacts for 1 hour, and is heated to 90 to 100 DEG C; polyethylene wax is added in the mixture; and then the mixture, is insulated for 1 to 3 hours, pumped, filtered, washed, dried and ground, so as to obtain a finished product. The preparation method has the advantage of obtaining the pigment yellow 83 which is bright in color light, high in tinting strength, high in covering power and good in dispersibility.
Description
technical field [0001] The invention relates to a preparation method of a pigment, in particular to a preparation method of pigment yellow. Background technique [0002] Currently, C.I. Pigment Yellow 83 is known as a yellow pigment acting on colored plastics. For Pigment Yellow 83, it is usually prepared by coupling 3,3'-dichlorobenzidine diazonium salt with 4-chloro-2,5-dimethoxyacetylacetanilide. The acid separation effect of the coupling component 4-chloro-2,5-dimethoxyacetylacetanilide directly affects the performance of the pigment. It has been proved that when the coupling component is acid-analyzed in the normal method, the precipitated particles are relatively large, and the phenomenon of nucleation is prone to occur, which will slow down the coupling speed and make it difficult to reach the end of the coupling. However, it is better to use a surfactant to improve the quality of the acid-analysis in the reverse method of acid-analysis. The positive acid analysis i...
Claims
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