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Preparation technology of direct mixed spinning purple dyestuff

A preparation process and a technology of dyes, which are applied in disazo dyes, dyeing methods, textiles and papermaking, and can solve the problems that the final dyes are difficult to meet the use requirements.

Inactive Publication Date: 2008-05-14
吴江市罗林染化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The final dye produced by this process contains toxic unreacted intermediate product 2-methoxy-5-methylaniline and other by-products, so it is difficult for the final dye to meet the usage requirements

Method used

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  • Preparation technology of direct mixed spinning purple dyestuff

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Embodiment Construction

[0030] A kind of preparation technology of direct blending violet dye, comprises following operation

[0031] Diazo reaction: Mix 30.3 parts by weight of 2-naphthylamine-4,8-disulfonic acid with 300 parts by weight of water, add sodium carbonate to neutralize to PH=7-7.5, lower the temperature to 0-5°C, add hydrochloric acid 28 parts by weight, then add 6.9 parts by weight of sodium nitrite, mix well, and react to the end after 2 hours to generate diazonium salt.

[0032] Coupling reaction: Mix and dissolve 14 parts by weight of 2-methoxy-5-methylaniline with a mixture of 200 parts by weight of water and 14 parts by weight of hydrochloric acid at 50°C, then cool down to 35°C, and then slowly dissolve the solution Add it to the diazonium salt generated in the diazonium reaction process, and carry out the coupling reaction at a temperature of 10-20 ° C. After 1 hour, use dilute sodium carbonate solution to adjust the pH to 4. After continuing the reaction for 2 hours, add dilute...

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Abstract

The present invention relates to a preparation process of direct union purple dyes. Said process includes the following procedures: diazotization reaction, coupling reaction, secondary diazotization reaction and secondary coupling reaction, after the coupling reaction and before secondary diazotization reaction a purification procedure is set, the described purification procedure includes the following steps: heating the obtained monoazo dyes to 70-90deg.C, adding hydrochloric acid to regulate pH value to 1.5-2, making the monoazo dyes be separated out, filtering and taking out filter cake, so that the unreacted intermediate product 2-methoxy-5-methylaniline and other by-product can be removed.

Description

technical field [0001] The invention relates to a known preparation process of direct dyes, which is suitable for the preparation of direct dyes for polyester / cotton blending in the same bath, especially the direct blending purple D-BL. Background technique [0002] In the prior art, a kind of preparation technology of direct blending violet dye comprises the following steps [0003] (1), diazonium reaction: 2-naphthylamine-4,8-disulfonic acid, hydrochloric acid, sodium nitrite mixed reaction generate diazonium salt; (2), coupling reaction: described diazonium salt and 2-methoxy-5-methylaniline mixed reaction generates intermediate monoazo dye; (3), secondary diazo reaction: the intermediate monoazo dye is mixed with hydrochloric acid and sodium nitrite for secondary Secondary diazonium reaction gets secondary diazonium compound; (4), secondary coupling reaction: 2-anilino-5-naphthol-7-sulfonic acid is mixed with sodium hydroxide solution, so that 2-anilino- 5-naphthol-7-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B31/02D06P1/02D06P3/58D06P3/52
Inventor 严国荣黄可萍谢家麟
Owner 吴江市罗林染化有限公司
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