Pigment dispersant, method of preparation and pigment dispersion system

Abstract

The detailed description of the present invention provides a pigment dispersant, a preparation method and a pigment dispersion system, the pigment dispersant is composed of a branched core, a solvated chain segment of a polyester segment or a polyether segment connected to the branched core and a heteroaryl anchoring group, the pigment dispersant with the branched structure has excellent dispersion and stability to inorganic pigments and organic pigments.

Description

Technical Field

[0001] This invention belongs to the field of coating additives, specifically relating to a pigment dispersant, its preparation method, and a pigment dispersion system. Background Technology

[0002] Pigment dispersants are additives that effectively improve pigment wettability, increase grinding and dispersion efficiency, and provide stability. In the production of coatings and inks, it is often necessary to uniformly disperse pigments in the base material and stabilize them at a certain particle size to achieve the final color performance and stability. However, due to the inherent particle size and density of pigments, problems such as agglomeration and sedimentation can easily occur, affecting product quality and stability. The role of pigment dispersants is to adsorb onto the pigment surface, enabling particles to possess repulsive forces sufficient to prevent aggregation caused by other particles getting too close; and to improve the suspension performance of pigments in the system, preventing sedimentation and ensuring uniform physicochemical properties throughout the system.

[0003] Pigment dispersants include anionic dispersants, cationic dispersants, nonionic dispersants, amphoteric dispersants, and polymeric hyperdispersants. Polymeric dispersants are the most commonly used and have the best stability. Polymeric hyperdispersants include anchoring groups and solvating segments. The anchoring groups can act on the surface of ultrafine powders through ionic bonds, covalent bonds, hydrogen bonds, and van der Waals forces, while the solvating segments can dissolve in the dispersion medium and play a role in steric stability of the dispersion system.

[0004] The application of pigments, especially high-end pigment coatings, has seen a surge in research in recent years, with the use of polymeric dispersants to improve their dispersibility and stability in coating solutions. Currently, commonly used industrial polymeric dispersants include polycarboxylate and polyether-modified propylene maleate copolymers. However, these polymeric dispersants are not ideal for dispersing high-end pigments. Summary of the Invention

[0005] This invention provides a pigment dispersant with excellent dispersion effect and stability, as detailed below:

[0006] A pigment dispersant comprising the structure of formula (1):

[0007]

[0008] In formula (1), A is the branched nucleus, L1 and L2 are the same or different linking groups, and X is a group of formula (2), (3), (4) or (5).

[0009]

[0010] In equations (2) and (3), Z represents O, S, or N atoms, and the k R1 atoms are independently selected from H, C, and S atoms.1-10 alkyl or C with substituents 1-10 Alkyl group, R2 is C 1-10 alkyl or C with substituents 1-10 alkyl, C 7-16 arylalkylene or C with substituents 7-16 arylalkylene groups, where k is 1, 2, or 3.

[0011] In equations (4) and (5), the h R3 atoms are independently selected from H atoms, C atoms, and C atoms. 1-10 alkyl or C with substituents 1-10 Alkyl group, R4 is C 1-10 alkyl or C with substituents 1-10 alkyl, C 7-16 arylalkylene or C with substituents 7-16 The arylalkylene group, where h is 1, 2, 3 or 4.

[0012] In formula (1), Y is a polyester segment or a polyether segment, n and m are integers greater than or equal to 1, and n+m is greater than or equal to 3.

[0013] Optionally, A is C. 1-10 Hydrocarbon saturated branched groups, wherein L1 and L2 are each independently C 0-10 It is a group formed by the addition of an amino group to an acrylate or epoxy monomer.

[0014] Optionally, the k R1 atoms and h R3 atoms are all hydrogen atoms.

[0015] Optionally, R2 and R4 are each independently selected from C. 1-4 Alkyl or benzyl groups.

[0016] A method for preparing a pigment dispersant as described above, comprising reacting compounds of formula (6), formula (7) and formula (8) to prepare the dispersant.

[0017]

[0018] In formulas (6) to (8), Q1 and Q2 are independent groups that can react with P, and X' is a group with the structure shown in formula (2) or formula (4).

[0019] Optionally, P is an acrylate group or an epoxy group, and Q1 and Q2 are each independently C 0-10 The amino group.

[0020] Optionally, the number-average molecular weight of the formula (8) is 1000-5000.

[0021] Optionally, n+m can be 3, 4, or 5.

[0022] Optionally, the amounts of the compounds of formula (7) and (8) are a mol and b mol, respectively, relative to 1 mol of the compound of formula (6), wherein (n+m) / 2x80%<a<(n+m) / 2x120%, (n+m) / 2x80%<b<(n+m) / 2x120%.

[0023] Optionally, the compound of formula (6) is further reacted with an alkylating agent to form an onium salt.

[0024] Optionally, the compound of formula (6) is trimethylolpropane triacrylate, glycerol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dimethylolpropane tetraacrylate, ethoxylated pentaerythritol tetraacrylate, trimethylolpropane triglycidyl ether, glycerol triglycidyl ether, or pentaerythritol tetraglycidyl ether.

[0025] Optionally, the compound of formula (7) is 1-(3-aminopropyl)imidazole or 4-(2-aminoethyl)pyridine.

[0026] Optionally, the compound of formula (8) is a polyetheramine.

[0027] A pigment dispersion system, the dispersion system comprising a pigment and the pigment dispersant described above.

[0028] The pigment dispersant of the specific embodiment of the present application, the pigment dispersant consisting of a branched core, a solvated segment of a polyester segment or a polyether segment connected to the branched core, and a heteroaryl anchoring group, has excellent dispersing and stabilizing properties for pigments. Specific Embodiment

[0029] The specific embodiment of the present application provides a pigment dispersant comprising the following formula (1):

[0030]

[0031] In formula (1), A is a branched core, L1 and L2 are the same or different connecting groups, respectively, and X is a group of the following formula (2), (3), (4), or (5),

[0032]

[0033] In formula (2) and (3), Z is an O, S, or N atom, k R1 are independently selected from H atoms, C 1-10 alkyl groups, or C 1-10 alkyl groups having a substituent, R2 is a C 1-10 alkyl group, or a C 1-10 alkyl group having a substituent, C 7-16 arylalkylene group, or C7-16 arylalkylene group having a substituent, k is 1, 2 or 3,

[0034] In formula (4) and (5), h R3are independently selected from H atom, C 1-10 alkyl group having a substituent, R4is C 1-10 alkyl group having a substituent, R4is C 1-10 alkyl group having a substituent, R4is C 1-10 alkyl group having a substituent, R4is C 7-16 arylalkylene group having a substituent, R4is C 7-16 arylalkylene group having a substituent, h is 1, 2, 3 or 4,

[0035] In formula (1), Y is a polyester segment or a polyether segment, n and m are integers of 1 or more, and n+m is 3 or more.

[0036] In the pigment dispersant of the present embodiment, the asterisk (*) in formula (2), (3), (4) and (5) indicates a linking site.

[0037] In the pigment dispersant of the present embodiment, the substituent can be specifically, for example, a hydroxyl group, a carboxyl group, an amine group, an ether group or a sulfonic acid group, etc.

[0038] In the pigment dispersant of the present embodiment, the C 1-10 alkyl group can be specifically, for example, a methyl group, an ethyl group, a propyl group, a butyl group or a pentyl group, etc.

[0039] In the pigment dispersant of the present embodiment, the C 1-10 alkylene group can be specifically, for example, a methylene group, an ethylene group, a propylene group, a butylene group or a pentylene group, etc.

[0040] In the pigment dispersant of the present embodiment, in some embodiments, A is a C 1-10 hydrocarbon saturated branched group, i.e., A is a branched group of saturated structure composed of carbon atom and hydrogen atom, in some embodiments, A is a C

[0041] In the pigment dispersant of the present embodiment, in some embodiments, L1and L2are independently C 0-10 group formed by addition of amine group of C 0-10 amine group of C n1 -NH2group, and n1is an integer of 0 to 10.

[0042] The pigment dispersant of the present application embodiment, in some embodiments, the k R1 and h R3 are both hydrogen atoms.

[0043] The pigment dispersant of the present application embodiment, in some embodiments, the X includes a group of formula (3) or formula (5), in some embodiments, the X consists of a group of formula (3) or formula (5), the onium salt of the group of formula (3) or formula (5) has better dispersibility and stability to pigments than the pigment dispersant of the group of formula (3) or formula (5) without onium salt. In some embodiments, the R2 and R4 are independently selected from C 1-4 alkyl or benzyl.

[0044] The pigment dispersant of the present application embodiment, in some embodiments, the polyether segment is CH3- (OCH2CH2) n2 - (OCH2CHR) n3 - (OCH2CHR)

[0045] The present application embodiment is also a method for preparing the pigment dispersant as described above, which is prepared by reacting a compound of formula (6), formula (7) and formula (8) below,

[0046]

[0047] In formula (6) to (8), Q1 and Q2 are independently groups that can react with P, and X' is a group of structure shown in formula (2) or formula (4).

[0048] The method for preparing the pigment dispersant of the present application embodiment, in some embodiments, the P is an acrylate group or an epoxy group, and Q1 and Q2 are independently C 0-10 amine groups. In some embodiments, the C 0-10 amine group is a group of - (CH2) n1 -NH2, and the n1 is an integer of 0 to 10.

[0049] The method for preparing the pigment dispersant of the present application embodiment, in some embodiments, the number average molecular weight of formula (8) is 1000-5000, and specifically the number average molecular weight can be 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500 or 5000.

[0050] The preparation method of the pigment dispersant in the embodiment of the present application, in some embodiments, n+m is 3, 4 or 5, that is, the compound of formula (6) is a 3-branch, 4-branch or 5-branch structure, considering that it is more advantageous to improve the dispersibility and stability, the 3-branch structure is not as good as the 4-branch or 5-branch structure, and more than 6-branch structures will cause the viscosity of the pigment dispersant itself to be too large, and further, the compound of formula (6) is a 4-branch or 5-branch structure.

[0051] The preparation method of the pigment dispersant in the embodiment of the present application, considering the better stability and dispersibility of the pigment dispersant, in some embodiments, the addition amount of formula (7) and (8) is a mol and b mol respectively, relative to 1 mol of formula (6), wherein (n+m) / 2*30%<a<(n+m) / 2*170%, (n+m) / 2*30%<b<(n+m) / 2*1720%, in some embodiments, (n+m) / 2*60%<a<(n+m) / 2*140%, (n+m) / 2*60%<b<(n+m) / 2*140%, in some embodiments, (n+m) / 2*80%<a<(n+m) / 2*120%, (n+m) / 2*80%<b<(n+m) / 2*120%, in some embodiments, (n+m) / 2*90%<a<(n+m) / 2*110%, (n+m) / 2*90%<b<(n+m) / 2*110%, in some embodiments, a=b=(n+m) / 2.

[0052] The preparation method of the pigment dispersant in the embodiment of the present application, in order to further improve the better stability and dispersibility of the pigment dispersant, further reacting with an alkylating agent, so that at least part or all of the groups represented by formula (2) or formula (4) form onium salt.

[0053] The preparation method of the pigment dispersant in the embodiment of the present application, in some embodiments, the alkylating agent is chlorobenzyl, and in some embodiments, the alkylating agent is triethyl phosphate.

[0054] The preparation method of the pigment dispersant in the embodiment of the present application, in some embodiments, the compound of formula (6) is trimethylolpropane triacrylate, glycerol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dimethylolpropane tetraacrylate, ethoxylated pentaerythritol tetraacrylate, trimethylolpropane triglycidyl ether, glycerol triglycidyl ether or pentaerythritol tetraglycidyl ether.

[0055] The method for preparing the pigment dispersant of the present application, in some embodiments, the compound of formula (7) is 1-(3-aminopropyl)imidazole or 4-(2-aminoethyl)pyridine.

[0056] The method for preparing the pigment dispersant of the present application, in some embodiments, the compound of formula (8) is a polyether amine, in some embodiments, the polyether amine is CH3-(OCH2CH2) n2 -(OCH2CHR) n3 NH2, wherein n2 and n3 are integers of 0 or above, the sum of n2 and n3 is 30-150, and R is a hydrogen atom or a methyl group, in some embodiments, the polyether amine is a polyether amine with trade name JEFFAMINE M-2070, JEFFAMINE M-1000 or JEFFAMINE M-3085.

[0057] The present application also provides a pigment dispersion system, which comprises a pigment and the above-mentioned pigment dispersant for dispersing the pigment particles in the dispersion system, in some embodiments, the pigment particles are inorganic pigments or organic pigments, in some embodiments, the pigment particles are carbon black, in some embodiments, the carbon black is high pigment carbon black.

[0058] The dispersion system of the present application, in some embodiments, the dispersion system is a color paste, which comprises an acrylic resin (for example, a hydroxyl acrylic resin), the pigment particles and the pigment dispersant, in the color paste, the weight percentage of the pigment particles in the dispersion system is 2-20 wt%, further 5-10 wt%, and the weight ratio of the pigment dispersant to the pigment particles is 1:5-2:1, which can be adjusted according to actual conditions.

[0059] The technical solutions of the present application will be further illustrated below in combination with examples and comparative examples.

[0060] Examples

[0061] Example 1

[0062] In a 1L five-necked flask, 85.16g trimethylolpropane triacrylate was added, and 862.17g polyether amine (JEFFAMINE M-2070) was added under stirring and nitrogen atmosphere, and the temperature was raised to 80 o C for 2 hours; 52.67g 4-(2-aminoethyl)pyridine was added, and the temperature was raised to 120 o C for 3 hours. The reaction was stopped, and the temperature was lowered to discharge the product.

[0063] Example 2

[0064] In a 1 L five-necked flask, 76.65 g of pentaerythritol tetraacrylate was added, nitrogen was bubbled, 870.19 g of polyetheramine (JEFFAMINE M-2070) was added under stirring, and the temperature was raised to 80 °C. o C for 2 hours; 53.16 g of 4-(2-aminoethyl)pyridine was added, the temperature was raised to 120 °C. o C for 3 hours. The reaction was stopped, and the temperature was lowered to discharge the product.

[0065] Example 3

[0066] In a 1 L five-necked flask, 129.59 g of pentaerythritol tetraacrylate was added, nitrogen was bubbled, 735.61 g of polyetheramine (JEFFAMINE M-2070) was added under stirring, and the temperature was raised to 80 °C. o C for 2 hours; 134.80 g of 4-(2-aminoethyl)pyridine was added, the temperature was raised to 120 °C. o C for 3 hours. The reaction was stopped, and the temperature was lowered to discharge the product.

[0067] Example 4

[0068] In a 1 L five-necked flask, 54.42 g of pentaerythritol tetraacrylate was added, nitrogen was bubbled, 926.71 g of polyetheramine (JEFFAMINE M-2070) was added under stirring, and the temperature was raised to 80 °C. o C for 2 hours; 18.87 g of 4-(2-aminoethyl)pyridine was added, the temperature was raised to 120 °C. o C for 3 hours. The reaction was stopped, and the temperature was lowered to discharge the product.

[0069] Example 5

[0070] In a 1 L five-necked flask, 89.97 g of dipentaerythritol pentaacrylate was added, nitrogen was bubbled, 857.64 g of polyetheramine (JEFFAMINE M-2070) was added under stirring, and the temperature was raised to 80 °C. o C for 2 hours; 52.39 g of 4-(2-aminoethyl)pyridine was added, the temperature was raised to 120 °C. o C for 3 hours. The reaction was stopped, and the temperature was lowered to discharge the product.

[0071] Example 6

[0072] In a 1 L five-necked flask, 107.24 g of dipentaerythritol pentaacrylate was added, nitrogen was bubbled, 817.83 g of polyetheramine (JEFFAMINE M-2070) was added under stirring, and the temperature was raised to 80 °C. o C for 2 hours; 74.94 g of 4-(2-aminoethyl)pyridine was added, the temperature was raised to 120 °C.o C keep 3 hours. Stop reaction, cool down and discharge.

[0073] Example 7

[0074] In a 1 L five-necked flask, 135.69 g of pentaerythritol tetraacrylate was added, nitrogen was bubbled and 770.21 g of polyetheramine (JEFFAMINE M-1000) was added under stirring, and the temperature was raised to 80 o C keep 2 hours; 94.10 g of 4-(2-aminoethyl)pyridine was added, and the temperature was raised to 120 o C keep 3 hours. Stop reaction, cool down and discharge.

[0075] Example 8

[0076] In a 1 L five-necked flask, 53.41 g of pentaerythritol tetraacrylate was added, nitrogen was bubbled and 909.55 g of polyetheramine (JEFFAMINE M-3085) was added under stirring, and the temperature was raised to 80 o C keep 2 hours; 37.04 g of 4-(2-aminoethyl)pyridine was added, and the temperature was raised to 120 o C keep 3 hours. Stop reaction, cool down and discharge.

[0077] Example 9

[0078] In a 1 L five-necked flask, 76.55 g of pentaerythritol tetraacrylate was added, nitrogen was bubbled and 869.06 g of polyetheramine (JEFFAMINE M-2070) was added under stirring, and the temperature was raised to 80 o C keep 2 hours; 54.39 g of 1-(3-aminopropyl)imidazole was added, and the temperature was raised to 120 o C keep 3 hours. Stop reaction, cool down and discharge.

[0079] Example 10

[0080] In a 1 L five-necked flask, 78.27 g of pentaerythritol tetraglycidyl ether was added, nitrogen was bubbled and 868.67 g of polyetheramine (JEFFAMINE M-2070) was added under stirring, and the temperature was raised to 80 o C keep 2 hours; 53.06 g of 4-(2-aminoethyl)pyridine was added, and the temperature was raised to 120 o C keep 3 hours. Stop reaction, cool down and discharge.

[0081] Example 11

[0082] In a 1 L five-necked flask, 72.65 g of pentaerythritol tetraacrylate was added, nitrogen was bubbled and 824.77 g of polyetheramine (JEFFAMINE M-2070) was added under stirring, and the temperature was raised to 80 oC, keep for 2 hours; add 50.38g 4-(2-aminoethyl)pyridine, warm to 120 o C, keep for 3 hours. Cool to 70 o C, control the temperature not to exceed 90 o C. After the end of the drop, continue to react at 90 o C for 2 hours, stop the reaction, cool to discharge.

[0083] Comparative Example 1

[0084] In a 1L five-necked flask, add 91.69g diethylene glycol diacrylate, nitrogen, open stirring, add 856.02g polyetheramine (JEFFAMINE M-2070), warm to 80 o C, keep for 2 hours; add 52.29g 4-(2-aminoethyl)pyridine, warm to 120 o C, keep for 3 hours. Stop the reaction, cool to discharge.

[0085] Preparation of color paste: 50 parts by weight of hydroxyl acrylic resin (solid content 50wt%), 5 parts by weight of the dispersant of the above examples 1-11, comparative example 1, 12.4 parts by weight of butyl acetate, 22.6 parts of propylene glycol methyl ether acetate, 10 parts by weight of high pigment carbon black FW200 and 200 parts by weight of corundum beads (particle size 1.8-2mm) are added to a 200ml shaking bottle, sealed in a high-speed shaking machine for 8 hours of high-speed shaking and grinding, and then filtered to obtain a black color paste.

[0086] Comparative Example 2: preparation of color paste without dispersant

[0087] 60 parts by weight of hydroxyl acrylic resin (solid content 50wt%), 7.4 parts by weight of butyl acetate, 22.6 parts of propylene glycol methyl ether acetate, 10 parts by weight of high pigment carbon black and 200 parts by weight of corundum beads (particle size 1.8-2mm) are added to a 200ml shaking bottle, sealed in a high-speed shaking machine for 8 hours of high-speed shaking and grinding, and then filtered to obtain a black color paste.

[0088] The color paint was prepared by mixing and stirring 33.8 parts by weight of a hydroxyl acrylate resin (65 wt% solid content), 0.2 parts by weight of a leveling agent (specifically UNIQFLOW 360S from Shanghai UNIQ Chemical Co., Ltd.), 0.2 parts by weight of a wetting agent (specifically UNIQFLOW 480U from Shanghai UNIQ Chemical Co., Ltd.), 14.3 parts by weight of butyl acetate, 11.3 parts by weight of propylene glycol methyl ether acetate, 14.3 parts by weight of xylene solvent, and 14.8 parts by weight of the black color paste described above. Then, 11.1 parts by weight of curing agent N3390 was added, and the mixture was stirred rapidly and uniformly to remove bubbles. The mixture was then coated on black and white card papers using a wire wound rod with a diameter of 100 μm. The wet film was dried at room temperature (23 °C) for 30 min, and then the black and white card papers were placed in an oven at 60 °C for 2 h. After cooling at room temperature, the colorimetric test was performed.

[0089] The fineness of the color paste was determined according to the test method of GB / T 1724-2019. The color paste sample was poured into the deep end of the fineness plate groove, and the sample was scraped from the deepest end to the position beyond the groove depth of zero on the entire surface of the fineness plate within 1-2 s using a scraper. The reading was taken as quickly as possible. The fineness of the color paste prepared by the dispersants of Examples 1-11 and Comparative Examples 1-2 was listed in Table 1 below.

[0090] The viscosity of the color paste was determined according to the test method of GB / T 10247-2008 using a CAP 2000+ vertebral plate viscosity tester (manufactured by BSOOKSIELD). The viscosity value at a set rotational speed was determined using a No. 2 rotor. The viscosity of the color paste prepared by the dispersants of Examples 1-11 and Comparative Examples 1-2 was listed in Table 1 below.

[0091] The colorimetric test of the color paint film was performed using an Agilent MA9X multi-angle colorimeter with a light source of D65, 45 o The colorimetric test results of the color paint film prepared by the dispersants of Examples 1-11 and Comparative Examples 1-2 were listed in Table 1 below.

[0092] Table 1: Application test evaluation results of examples and comparative examples

[0093]

[0094] According to the results of the above table, compared with the linear pigment dispersant of comparative example 1 including polyether segment solvent chain segment and anchoring group, the branched structure pigment dispersant of example 1-10 has better viscosity reducing dispersion effect, and the prepared color paste has better color development. According to the experimental results of example 1, 2 and 5, the 4 branched structure has better effect than the 3 branched and 5 branched structures. According to the results of example 2-4, when the molar number of the solvent chain segment and the anchoring group is equivalent, the effect is better. According to the comparison of the molecular weight of the solvent chain segment in example 2, 7 and 8, the polyether amine (JEFFAMINE M-2070) in example 2 has a number average molecular weight of about 2000, and has better effect. According to the results of example 11, further anchoring the group 4-(2-aminoethyl) pyridinium salt is beneficial to further improve the viscosity reducing dispersion effect and the color development of the color paste.

[0095] Although the present application has been disclosed with reference to the above examples, the present application is not limited to this. Any person skilled in the art can make various modifications and changes without departing from the spirit and scope of the present application, and the protection scope of the present application should be limited by the scope defined in the claims.

Claims

1. A pigment dispersant, characterized by, The pigment dispersant includes a structure of the following formula (1): ， In formula (1), A is a branched core, L1 and L2 are the same or different linking groups, respectively, and X is a group of the following formula (2), (3), (4) or (5), ， In formula (2) and (3), Z is an O, S or N atom, k R1s are each independently selected from an H atom, a C 1-10 1-4 alkyl group or a C 1-10 1-4 alkyl group having a substituent, R2 is a C 1-10 1-4 alkyl group or a C 1-10 1-4 alkyl group having a substituent, a C 7-16 6 arylalkylene group or a C 7-16 6 arylalkylene group having a substituent, and k is 1, 2 or 3. In formula (4) and (5), h is 1, 2, 3 or 4, and each R3is independently selected from H, C 1-10 alkyl or substituted C 1-10 alkyl, R4is C 1-10 alkyl or substituted C 1-10 alkyl, C 7-16 arylalkylene or substituted C 7-16 arylalkylene. In formula (1), Y is a polyester segment or a polyether segment, n and m are integers of 1 or more, and n+m is 3 or more; The A is C 1-10 hydrocarbon saturated branched group, L1and L2are each independently C 0-10 formed after addition of an amine group to an acrylic or epoxy monomer.

2. The pigment dispersant according to claim 1, characterized by The k R1 and h R3 are hydrogen atoms.

3. The pigment dispersant according to claim 1, characterized by R2and R4are each independently selected from C 1-4 alkyl or benzyl.

4. A method for producing the pigment dispersant according to any one of claims 1 to 3, characterized by, The compounds of the following formula (6), the following formula (7) and the following formula (8) are reacted to prepare, ， In formula (6)-(8), Q1 and Q2 are independently groups that can react with P, and X' is a group of the structure shown in formula (2) or formula (4); wherein P is an acrylate group or an epoxy group, Q1and Q2are each independently a C 0-10 amine group.

5. The preparation method according to claim 4, characterized in that, The number average molecular weight of formula (8) is 1000-5000.

6. The preparation method according to claim 4, characterized in that, n+m is 3, 4 or 5.

7. The preparation method according to claim 4, characterized in that, The addition amount of formula (7) and (8) is a mol and b mol, respectively, relative to 1 mol of the addition amount of formula (6) compound, wherein (n+m) / 2×80% <a < (n+m) / 2×120%, (n+m) / 2×80% <b < (n+m) / 2×120%.

8. The preparation method according to claim 4, characterized in that, After the compounds of formula (6), formula (7) and formula (8) are reacted, further reacted with an alkylating agent to form an onium salt.

9. The preparation method according to claim 4, characterized in that, The compound of formula (6) is trimethylolpropane triacrylate, glycerol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dimethylolpropane tetraacrylate, ethoxylated pentaerythritol tetraacrylate, trimethylolpropane triglycidyl ether, glycerol triglycidyl ether or pentaerythritol tetraglycidyl ether.

10. The method of claim 4, wherein, The compound of formula (7) is 1-(3-aminopropyl)imidazole or 4-(2-aminoethyl)pyridine.

11. The preparation method according to claim 4, characterized in that, The compound of formula (8) is a polyetheramine.

12. A pigment dispersion system characterized in that, The dispersion system includes a pigment and the pigment dispersant of any one of claims 1-3.

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