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Silicon-based modified fadable pigment and preparation method thereof

A fading pigment and silicon-based technology, applied in the field of silicon-based modified fading pigments and their preparation, can solve the problems of fading and unfavorable paper recycling, and achieve the effects of good tinting strength, energy saving and good physiological compatibility

Active Publication Date: 2014-04-30
安徽省智力猴文化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pigment cannot fade under normal temperature and pressure, which is not conducive to the recycling of paper

Method used

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  • Silicon-based modified fadable pigment and preparation method thereof
  • Silicon-based modified fadable pigment and preparation method thereof
  • Silicon-based modified fadable pigment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of amino-modified silica: disperse 1 g of silica with a particle size of 50-300 nm (see figure 1 , Figure 7 ) into 93mL absolute ethanol to obtain a bluish transparent liquid. Add 0.7mL γ-aminopropyltriethoxysilane, stir at room temperature for 5h, then centrifuge at high speed (12000rpm, 30min), wash with ethanol, acetone, tetrahydrofuran twice (12000rpm, 15min) in order to remove Unreacted γ-aminopropyltriethoxysilane and polycondensate to obtain amino-modified silica (see figure 2 ).

[0028] figure 1 Medium, 3427cm -1 Left and right are SiO 2 Stretching vibration region of surface adsorbed hydroxyl group, 1630cm -1 There are weak carbonyl stretching vibrations on the left and right, which may be due to the dispersion of silica with a carboxyl-containing dispersant.

[0029] figure 2 , C-N stretching vibration at 958cm -1 The shoulder peak at corresponds to the deformation vibration absorption peak of the amino group.

[0030] (2) Prepara...

Embodiment 2

[0034] Weigh 0.1 g of carboxy-modified silica, the product of step (2) in Example 1, and put it into 10 mL of dichloromethane, then add 3 mL of ethanol and 0.1 g of HATU, and disperse evenly at room temperature, then add 0.2 g of acid fuchsin, and Reaction 20h. The product was vacuum-dried at 110°C for 8 hours to obtain a red silicon-based modified fadeable pigment (see Figure 5 , Figure 9 ).

[0035] The pigment is bright red and does not fade when washed with water. After adding 5% formamidine sulfinic acid solution, the red color will completely fade within 10 minutes.

Embodiment 3

[0037] Weigh 0.1 g of carboxy-modified silica, the product of step (2) in Example 1, and put it into 10 mL of dichloromethane, then add 2 mL of ethanol and 0.1 g of HATU, after uniform dispersion at room temperature, add 0.3 g of acid green, and react at room temperature 25h. The product was vacuum-dried at 110°C for 7 hours to obtain a green silicon-based modified fadeable pigment (see Figure 6 , Figure 10 ).

[0038] The bright color of the pigment does not fade when washed with water, and the green color completely fades within 4 minutes after adding 3% sodium sulfite solution.

[0039] The above red, green and blue dyes have similar molecular structures and are all bonded to the same substrate through amide bonds, so their spectra are similar.

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Abstract

The invention provides a silicon-based modified fadable pigment and a preparation method thereof. The fadable pigment is prepared by modifying silicon dioxide through an amino and modifying by carboxyl, and carrying out a condensation reaction with a dye containing the amino under the effect of a catalyst. The pigment takes the silicon dioxide as a carrier, has good physiological compatibility and has no pollution to the environment; the pigment can be faded at a normal temperature and a normal pressure under the effects of sodium sulfite, formamidine sulphinic acid, sodium borohydride and the like; the pigment provided by the invention has good tinting strength, color and luster and brightness, can be used for preparing fadable writing printing ink, printing ink and printing ink for an ink-jet printer, and can also be used for fields including coating, oil pant and the like.

Description

technical field [0001] The invention relates to a pigment, in particular to a silicon-based modified fadeable pigment and a preparation method thereof. Background technique [0002] Pigments are widely used in coatings, paints, inks and other fields. In the recycling process of advertising, newspapers, waste paper and other printed materials, deinking of waste paper will cause great environmental pollution and consume a lot of energy. If the waste paper deinking process can be simplified, it can promote the green chemical process, save forest resources and protect the ecological environment. [0003] Chinese Patent No. ZL00816639.0 discloses a high-strength monoazo yellow pigment, by diazotizing anthranilic acid, combining the diazo compound with 1-(3'-sulfophenyl)-3-methyl- Obtained by coupling of 5-pyrazolone and subsequent lake of the coupling product as a strontium salt. This new pigment has excellent heat stability and bleed fastness as well as very high color streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B67/20C09B67/24C09C1/28C09C3/12C09C3/08
Inventor 宋胜梅孙敏周叶红刘付永马学文双少敏董川
Owner 安徽省智力猴文化科技有限公司
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