Rare earth complex red pigment with excellent pigment performance and application thereof

A red pigment and rare earth technology, applied in the field of monoazo rare earth complexed red pigments, can solve the problems of heat resistance stability, poor light fastness, etc., and achieve excellent migration resistance, simple synthesis process, and cheap and easy raw materials The effect

Active Publication Date: 2013-01-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, many pigments have limited their application in plastics, coatings and other fields due to their poor heat resistance stability and light fastness.

Method used

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  • Rare earth complex red pigment with excellent pigment performance and application thereof
  • Rare earth complex red pigment with excellent pigment performance and application thereof
  • Rare earth complex red pigment with excellent pigment performance and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]

[0022] Dissolve CLT acid (0.021mol, 4.87g) and 6.24ml of 5N dilute hydrochloric acid in 130ml of water, slowly add 2.88ml of 52.6% sodium nitrite solution, and keep the temperature at 15-18°C. After 3 h of reaction a diazotized suspension was obtained. Excess sodium nitrite was removed by adding sulfamic acid, and starch-potassium iodide test paper was used to check whether excess sodium nitrite was removed.

[0023] Mix 3.52ml of 45% NaOH solution with 40ml of water, dissolve in β-naphthol (0.022mol, 3.26g) and dilute to 90ml. Add the diazotized suspension at 20°C and, after stirring well, neutralize with acetic acid solution (0.5 g glacial acetic acid dissolved in 3 ml water). Then fully stir, filter, and dry at 60°C to obtain the early stage dye.

[0024] The obtained early stage dye was purified by recrystallization from DMF, dissolved in 40ml of water, and stirred for 12h. Then heat to above 100°C to obtain a transparent solution, then add 70ml of acetic ac...

Embodiment 2

[0027]

[0028] Dissolve 4B acid (0.026mol, 5g) in water, and then add 6g of 25% ammonia solution to adjust the pH to ≥8. After stirring until the solution is completely clear, add an ice bath and cool down to 0°C. Join NaNO 2 1.93g, then slowly add 12.5g of 20% dilute hydrochloric acid dropwise, t=0-5°C, and reach the end of diazotization after half an hour. Excess sodium nitrite was removed by adding sulfamic acid, and starch-potassium iodide test paper was used to check whether excess sodium nitrite was removed.

[0029] 6.265gNa 2 CO 3 The prepared 4% alkali solution dissolved 2,3-acid (0.027mol, 5.24g), pH>8. Add it dropwise to the above diazonium solution within 20min at a temperature of 8-10°C. After the addition, adjust the pH to 10-10.2. It reaches the end point after 2 hours. Filter, wash with water, and dry at 60°C to obtain the early stage dye.

[0030] The obtained early stage dye is purified by acetic acid recrystallization, dissolved in an appropriate ...

Embodiment 3

[0034]

[0035]Mix 100ml of water and 3.6g of NaOH, heat up to 70°C, add anthranilic acid (0.03mol, 5.19g), continue to heat up to 80°C, stir until completely dissolved, then cool down to about 50°C, slowly add 8.2g of 20% dilute hydrochloric acid. After the acid analysis is completed, add ice to cool down to below 15°C, then add 2.1g of sodium nitrite, react for about 45min, add 2.0g of ammonium chloride, stir for 15min, and set aside.

[0036] Add 110ml of water and 8.3g of 30% NaOH solution to the reactor, heat up to 60°C, add naphthol AS derivative (0.03mol, 10.29g), continue to heat up to complete dissolution, then cool down to 65°C, filter, and the filtrate Pour into the coupling reactor, and slowly add 4.7g of dilute acetic acid dropwise. After the acid analysis is completed, the pH value is 6.5, add 3g of sodium acetate, stir for 15min, and set aside.

[0037] Add the diazo component to the coupling component slowly and uniformly for about 30 minutes, then continu...

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PUM

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Abstract

The invention discloses a novel monoazo rare earth complex red pigment and an application thereof. The raw material used for preparing the pigment is easily obtained, the reaction condition is simple and feasible and the yield is high; compared with the similar industrial pigments such as lake pigment P.R.53:1, P.R.57:1, P.R.151, P.R.243 and the like, the rare earth complex red pigment has more excellent pigment performances as follows: excellent water resistance, solvent resistance, fastness to heat, light fastness, fastness to weathering and migration resistance. Simultaneously, compared tothe existing organic pigments that are generated by transitional metal ions such as metal salt or complexes, the rare earth complex red pigment has more flamboyant chromatic light and more satisfactory transparency.

Description

technical field [0001] The invention relates to a monoazo rare earth complexed red pigment and its application, in particular to a monoazo rare earth lake red pigment derived from 2-hydroxyl-3-naphthylcarboxamide (naphthol AS) and its application. Background technique [0002] In recent years, compared with pure inorganic complexes and pure organic compounds, compounding rare earth ions and fine organic compounds has become an effective method to improve material properties and discover special application properties. By designing an appropriate organic monoazo dye structure as a ligand, the rare earth complex (or lake) pigment with certain functions is prepared. [0003] Lake refers to the non-water-soluble colored substance precipitated from water-soluble dyes under the action of precipitant in the presence of fillers, such as aluminum hydroxide, aluminum barium white, etc. It is also possible to prepare lakes without fillers, called chromogens. Among them, the precipita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B63/00C09B29/00C09D11/02C09D11/037
Inventor 王利民苏岚王峰陈立荣田禾王桂峰杨柳波郭珍女
Owner EAST CHINA UNIV OF SCI & TECH
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