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High-concentration neutral ink color paste and preparation method thereof

A neutral ink, high-concentration technology, used in inks, pigment pastes, household appliances, etc., can solve the problems of small steric hindrance of dispersants, easy flocculation of pigments, poor color paste stability, etc., to achieve excellent matching, low Viscosity, the effect of reducing viscosity

Active Publication Date: 2015-08-19
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
However, only relying on the dispersant used in the color paste without a well-matched color paste blending process will still cause pigment agglomeration in the preparation process of the color paste and pigment instability during storage. Therefore, how to use a good dispersion Matching the corresponding color paste preparation process on the basis of the agent, so as to obtain the color paste with low viscosity, good stability and high solid content, which has become an important issue in the field of neutral ink

Method used

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  • High-concentration neutral ink color paste and preparation method thereof
  • High-concentration neutral ink color paste and preparation method thereof
  • High-concentration neutral ink color paste and preparation method thereof

Examples

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preparation example Construction

[0021] (1) Preparation of styrene-maleic anhydride copolymer: mix styrene:maleic anhydride in a molar ratio of 1:0.5 to 1.5 as a reactant, use toluene as a solvent, and use a thermal free radical initiator at 60 to 85°C Initiate the free radical copolymerization reaction for 3-5 hours. After the reaction is finished, filter with suction. Use toluene as the wetting agent to wash the solid product obtained by suction filtration three times to obtain a white powder. Dry the white powder in vacuum at 40-60°C for 48 hours. Obtain styrene-maleic anhydride copolymer at last; Wherein the mol ratio of styrene and thermal radical initiator is 1:0.001~0.005, the consumption of toluene as solvent is to make the concentration of styrene be 0.1~2.5mol / L;

[0022] (2) Preparation of amidated styrene-maleic anhydride copolymer: Dissolve ethylene glycol amine in dimethylformamide at a concentration of 0.5 to 1.0 mol / L, then dissolve the styrene-maleic anhydride obtained in (1) Add the anhydrid...

Embodiment 1

[0028](1) Pre-dispersion and grinding: fully dissolve the water-soluble dispersant in deionized water in an amount of 2wt.% of the total color paste, and then add 40wt.% of the pigment to the total color paste. Dispersion grinding, the particle size of zirconium beads ground in the basket mill is 0.5-0.6 mm, the filling density is 60%, the rotation speed is 1000 rpm, the pre-dispersion grinding time is 90 min, the pre-dispersion grinding temperature is 20 ° C, the pre-dispersion grinding After the end, filter the grinding product with a 800-mesh screen to obtain a pre-dispersed grinding liquid; wherein the water-soluble dispersant is styrene-maleic anhydride through ethylene glycol amine amidation reaction, diammonium hydrogen phosphate esterification reaction, ammonia water Prepared by ammonium salification reaction, the HLB of the water-soluble dispersant is 5, the weight average molecular weight is 12000, and the mol ratio of the styrene segment and the maleic anhydride segm...

Embodiment 2

[0033] (1) Pre-dispersion and grinding: fully dissolve the water-soluble dispersant in deionized water in an amount of 6wt.% of the total color paste, and then add 50wt.% of the pigment to the total color paste. Dispersion grinding, the particle size of the zirconium beads ground in the basket mill is 0.5-0.6 mm, the filling density is 60%, the rotation speed is 2000 rpm, the pre-dispersion grinding time is 60 min, the pre-dispersion grinding temperature is 45 ° C, the pre-dispersion grinding After the end, the grinding product is filtered with a 1500-mesh screen to obtain a pre-dispersed grinding liquid; the water-soluble dispersant is made of styrene-maleic anhydride in sequence through the amidation reaction of ethylene glycol amine, the esterification reaction of diammonium hydrogen phosphate, and the ammonia water Prepared by ammonium salification reaction, the HLB of the water-soluble dispersant is 15, the weight-average molecular weight is 30000w, and the mol ratio of th...

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Abstract

The invention discloses high-concentration neutral ink color paste and a preparation method thereof. The solid content of the high-concentration neutral ink color paste is not lower than 40 weight percent, ; the particle size D90 of color paste particles is not greater than 250nm, ; the high-speed settling rate of the color paste is not greater than 50 micrometers / min, and the color paste has lower viscosity of 70 to 200mPs. The invention also provides a preparation method of the high-concentration neutral ink color paste. The preparation method comprises the following steps of firstly, generally performing amidation, esterfication, ammonia salt treatment and modification on conventional styrene-maleic anhydride to obtain a water soluble dispersant; secondly, adding the water soluble dispersant and pigment according to a certain proportion for stirring and dispersing; thirdly, performing high-speed grinding and coarse grinding, lengthening a long-chain polyether modified silicone surfactant by coarse grinding; fourthly, performing fine grinding and impurity filtering treatment to obtain the high-concentration neutral ink color paste. The high-concentration neutral ink color paste prepared by the invention has high concentration, lower viscosity and better stability, has excellent matching property for preparing neutral ink at a later stage, and has a broad application prospect in the application of blending the neutral ink.

Description

technical field [0001] The invention relates to the preparation of a neutral ink color paste, in particular to a high-concentration neutral ink color paste with a color paste concentration of not less than 40wt.% and a preparation method thereof, belonging to the field of ink 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 deploymen...

Claims

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Application Information

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IPC IPC(8): C09D17/00
CPCC09D11/17C09D11/18
Inventor 周炜黄小喜江振林
Owner LOTUS STATIONERY
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