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Water-soluble dispersing agent for gel ink and preparation method of water-soluble dispersing agent

A neutral ink and dispersant technology, applied in the direction of pigment paste, etc., can solve the problems of few potential points, difficult to prepare stable color paste, small steric hindrance of dispersant, etc., to improve potential density, facilitate dispersion and charge stability the effect of enhancing steric hindrance and charge repulsion

Active Publication Date: 2015-08-26
LOTUS STATIONERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current styrene-maleic anhydride copolymer is difficult to prepare a stable color paste with a high concentration, mainly because the current dispersant has less steric hindrance and fewer potential points, so it is difficult to maintain the high-concentration color paste. There is less steric hindrance between them and it is easy to flocculate, which leads to the problem of poor stability of color paste

Method used

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  • Water-soluble dispersing agent for gel ink and preparation method of water-soluble dispersing agent
  • Water-soluble dispersing agent for gel ink and preparation method of water-soluble dispersing agent
  • Water-soluble dispersing agent for gel ink and preparation method of water-soluble dispersing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) The preparation of styrene-maleic anhydride copolymer: take styrene, maleic anhydride as raw material, toluene is solvent, control styrene concentration is 0.1mol / L, and the raw material molar ratio of styrene, maleic anhydride is 1:0.5, use benzoyl peroxide or azobisisobutyronitrile as the initiator, the amount of the initiator is 1:0.001 of the molar ratio of styrene to the initiator, react at 60°C for 5 hours, and pump out after the reaction Filter, use toluene as a wetting agent, and rinse three times to obtain a white powder. After vacuum drying at 60°C for 48 hours, a styrene-maleic anhydride copolymer is obtained.

[0028] (2) Preparation of amidated styrene-maleic anhydride copolymer: with dimethylformamide (DMF) as solvent, to 0.5mol / L ethylene glycol amine in dimethylformamide, according to ethylene glycol The molar ratio of the amine to the carboxylic acid in the above-mentioned styrene-maleic anhydride copolymer is 1:0.5, add the styrene-maleic anhydride...

Embodiment 2

[0033] (1) The preparation of styrene-maleic anhydride copolymer: take styrene, maleic anhydride as raw material, toluene is solvent, control styrene concentration is 2.5mol / L, and the raw material molar ratio of styrene, maleic anhydride is 1:1.5, using benzoyl peroxide or azobisisobutyronitrile as the initiator, the amount of the initiator is 1:0.005 of the molar ratio of styrene to the initiator, reacting for 3 hours at 85°C, and pumping after the reaction Filter, use toluene as a wetting agent, and rinse three times to obtain a white powder. After vacuum drying at 40°C for 48 hours, a styrene-maleic anhydride copolymer is obtained.

[0034] (2) Preparation of amidated styrene-maleic anhydride copolymer: with dimethylformamide as solvent, to ethylene glycol amine of 1.0mol / L in dimethyl formamide, according to ethylene glycol amine and above-mentioned The molar ratio of carboxylic acid in the styrene-maleic anhydride copolymer is 1:0.5, add the above-mentioned obtained styr...

Embodiment 3

[0039] (1) The preparation of styrene-maleic anhydride copolymer: take styrene, maleic anhydride as raw material, toluene is solvent, control styrene concentration is 0.5mol / L, and the raw material molar ratio of styrene, maleic anhydride is 1:1, use benzoyl peroxide or azobisisobutyronitrile as the initiator, the amount of the initiator is 1:0.004 of the molar ratio of styrene to the initiator, react for 5 hours at 80°C, and pump out after the reaction Filter, use toluene as a wetting agent, and rinse three times to obtain a white powder. After vacuum drying at 60°C for 48 hours, a styrene-maleic anhydride copolymer is obtained.

[0040] (2) Preparation of amidated styrene-maleic anhydride copolymer: with dimethylformamide as solvent, to ethylene glycol amine of 1.0mol / L in dimethyl formamide, according to ethylene glycol amine and above-mentioned The molar ratio of carboxylic acid in the styrene-maleic anhydride copolymer is 1:0.5, add the above-mentioned obtained styrene-ma...

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Abstract

The invention discloses a water-soluble dispersing agent for gel ink and a preparation method of the water-soluble dispersing agent. According to the method, styrene-maleic anhydride polyester adopting an amphiphilic structure is modified through ethylene glycol amine and diammonium hydrogen phosphate, and the styrene-maleic anhydride polyester dispersing agent with large steric hindrance and a multi-charge structure is prepared. The dispersing agent has a good dispersion effect on pigments, is especially applicable to preparation of gel ink high-concentration color paste, can be used for preparing gel ink high-concentration color paste with the concentration higher than 40 wt. %, has low system viscosity, good stability and a wide application range and has a wide market prospect.

Description

technical field [0001] The invention relates to the preparation of a water-soluble dispersant, in particular to a dispersant suitable for the preparation of neutral ink high-concentration color paste and a preparation method thereof, belonging to the field of high molecular polymer preparation. Background technique [0002] Neutral ink color paste is a highly dispersed pigment dispersion system, which is to grind pigments, surfactants, water and other media, so that pigment particles can be uniformly and stably dispersed in the water-based system under the action of shear force. Pigment color paste for neutral ink, which consists of: pigments, surfactants, additives, deionized water, etc. Among them, the selection of pigments and surfactants plays a decisive role in the preparation of color paste and the performance of final products. [0003] The existing neutral ink production process is generally divided into two steps, that is, the preparation of color paste and the dep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F222/06C08F8/44C08F8/40C09D17/00
Inventor 周炜黄小喜江振林
Owner LOTUS STATIONERY
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