Water-soluble dispersant, manufacturing process therefor and its application

Abstract

A water-soluble dispersant, a process for its preparation, and an application thereof are disclosed. The water-soluble dispersant comprises a polyether-modified polymer A and an amide polymer B; the raw materials for the preparation of the polyether-modified polymer A comprise a vinylbenzene monomer, an alkyl succinic anhydride, an active polyether macromonomer, and a monohydric alkyl alcohol; the amide polymer B comprises a homopolymer of a vinylpyrrolidone and / or a copolymer of a vinylpyrrolidone. The types of functional groups in the water-soluble dispersant system of the present application are more diverse, which improves the wetting and protective properties of the dispersant on the dispersed dye particles, thus improving the milling properties of the dispersed dyes, the proportion of dye particles in the dispersion, and the stability of the dispersion.

Claims

[1] Water-soluble dispersant comprising a polyether-modified polymer A and an amide polymer B; wherein raw materials for producing the polyether-modified polymer A comprise a vinylbenzene monomer, an allylsuccinic anhydride, an active polyether macromonomer and a monohydric alkyl alcohol, wherein the amide polymer B comprises a homopolymer of vinylpyrrolidone and / or a copolymer of vinylpyrrolidone. [2] A water-soluble dispersant according to claim 1, wherein the active polyether macromonomer is prepared by the following preparation process: adding polyetheramine and allylsuccinic anhydride to a reactor, heating, and heat conservation until no more water is distilled out during the reaction to obtain the active polyether macromonomer. [3] The water-soluble dispersant according to claim 2, wherein the polyetheramine is a mono-primary aminopolyether prepared by self-polymerization of ethylene oxide or copolymerization of ethylene oxide and propylene oxide using a monohydric alcohol as an initiator and in which the terminal hydroxyl group is replaced by an amino group. [4] A water-soluble dispersant according to claim 2 or 3, wherein the polyetheramine has a weight-average molecular mass of 500 to 2500 g / mol. [5] A water-soluble dispersant according to any one of claims 2 to 4, wherein the polyetheramine comprises one or a combination of at least two of a JEFFAMINE M-2070, a JEFFAMINE M-1000 or a JEFFAMINE M-600; wherein the molar ratio of the polyetheramine to the allylsuccinic anhydride is preferably (0.5 to 1.5) to 1 and preferably 1 to 1, wherein heating is preferably carried out at 120 to 160 °C, wherein heat preservation is preferably carried out over a period of 2 to 6 hours, wherein the active polyether macromonomer is preferably prepared under protective gas. [6] A water-soluble dispersant according to any one of claims 1 to 5, wherein the active polyether macromonomer has a structure shown in formula I below:wherein R1 is a hydrogen atom or a methyl group, R2 is a methyl group, an ethyl group, a propyl group or a butyl group, m is an integer from 10 to 60, and n is an integer from 0 to 15. [7] A water-soluble dispersant according to any one of claims 1 to 6, wherein the vinylbenzene monomer comprises one or a combination of at least two of a styrene, a β-methylstyrene, an allylbenzene, a 3-methylstyrene, a 2-methylstyrene or a 2-isopropenyltoluene, wherein preferably the monohydric alkyl alcohol comprises one or a combination of at least two of a methanol, an ethanol, a propanol, an n-butanol, an isopropanol, an isobutanol or a tert-butanol, wherein preferably the mass ratio of the vinylbenzene monomer to the allylsuccinic anhydride and to the active polyether macromonomer is (2 to 10) to (5 to 20) to (30 to 80), wherein the molar ratio of the monohydric alkyl alcohol to the allylsuccinic anhydride is preferably (0.1 to 1) to 1 and preferably 1 to 1. [8] A water-soluble dispersant according to any one of claims 1 to 7, wherein the raw materials for producing the polyether-modified polymer A further comprise an initiator and a catalyst, wherein preferably the initiator comprises one or a combination of at least two of a benzoyl peroxide, a tert-butyl peroxybenzoate, a methyl ethyl ketone peroxide, a dicumyl peroxide, a di-tert-butyl peroxide or a 2,2-bis(tert-butylperoxy)butane, wherein the catalyst preferably comprises one or a combination of at least two of a p-toluenesulfonic acid, a sulfuric acid, a propionic acid, a sulfamic acid or a hydrochloric acid, wherein the raw materials for producing the polyether-modified polymer A preferably comprise the following components by weight: Vinylbenzene monomer 4 to 20 pieces, Allylsuccinic anhydride 10 to 40 pieces, active polyether macromonomer 60 to 160 pieces, monohydric alkyl alcohol in a molar ratio of monohydric alkyl alcohol to allylsuccinic anhydride of (0.1 to 1) to 1, initiator 0.5 to 2 parts. and catalyst 1 to 3 parts. [9] Water-soluble dispersant according to any one of claims 1 to 8, wherein the polyether-modified polymer A has a weight-average molecular weight of 5,000 to 10,000 g / mol and preferably 20,000 to 60,000 g / mol, wherein the amide polymer B preferably has a weight-average molecular mass of 2,000 to 100,000 g / mol and preferably 10,000 to 50,000 g / mol, wherein preferably the amide polymer B comprises one or a combination of at least two of a PVPK25, a PVPK30, a PVPK35 or a copovidone VA64, wherein preferably the mass ratio of the polyether-modified polymer A to the amide polymer B is (7 to 22) to (4 to 7). [10] A water-soluble dispersant according to any one of claims 1 to 9, wherein the water-soluble dispersant further comprises deionized water and a pH adjuster; preferably, the raw materials for preparing the water-soluble dispersant comprise the following components by weight: polyether-modified polymer A 70 to 220 pieces, Amide polymer B 40 to 70 pieces, deionized water 80 to 200 pieces, and pH adjuster which adjusts the pH of the system to 7 to 10. [11] A manufacturing process for the water-soluble dispersant according to any one of claims 1 to 10, comprising the following steps: (1) adding an active polyether macromonomer in a formulation amount to a reactor, heating, then adding a vinylbenzene monomer, an allylsuccinic anhydride, and an optional initiator, and conducting a reaction while maintaining heat, and then adding a monohydric alkyl alcohol and an optional catalyst sequentially, conducting another reaction while maintaining heat, taking and testing samples every 30 minutes until the difference between the acid values ​​of the system in two adjacent tests is ≤ 2 mgKOH / g, and terminating the reaction to obtain the polyether-modified polymer A, and (2) cooling the polyether-modified polymer A obtained in step (1), then adding optionally deionized water and the amide polymer B, and then optionally adding a pH adjuster and stirring to obtain the water-soluble dispersant. [12] The manufacturing method according to claim 11, wherein the heating in step (1) is heating to 100 to 150°C. [13] The manufacturing method according to claim 11 or 12, wherein the heat-preservation reaction in the step (1) is carried out at a temperature of 100 to 150 °C and the heat-preservation reaction is carried out for a period of 1 to 3 hours, preferably the other heat-preservation reaction in the step (1) is carried out at a temperature of 100 to 150 °C and the other heat-preservation reaction is carried out for a period of 2 to 10 hours. [14] Manufacturing method according to one of claims 11 to 13, wherein step (1) and step (2) are both carried out under protective gas, preferably cooling to 50 to 60 °C in step (2). [15] Use of the water-soluble dispersant according to any one of claims 1 to 10 in a dye dispersion.