Surface modified pigment and epoxy floor color paste and epoxy floor paint with same

Abstract

The invention discloses a surface modified pigment and epoxy floor color paste and epoxy floor paint with the same. The surface modified pigment is prepared by dissolving a polyhydroxy aromatic derivative in a solvent, spraying the solvent to the surface of the pigment, removing the solvent and then reacting with polyfunctional glycidyl ether and the polyhydroxy aromatic derivative. According to the surface modified pigment as well as the epoxy floor color paste and the epoxy floor paint with the surface modified pigment, the polyhydroxy aromatic derivative has aromatic groups, can be more easily attached to the surface of the pigment, is favorable for realizing better coating and modification, and is favorable for improving the dispersion stability of the pigment by forming HPB modification on the surface of the pigment; the epoxy floor color paste prepared from the surface modified pigment has the advantages of small fineness, low viscosity and stable storage, and the epoxy floor paint prepared from the epoxy floor color paste does not have the problems of flooding and floating in the construction process.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coatings, and particularly relates to a surface-modified pigment, an epoxy floor color paste with the same, and an epoxy floor paint. BACKGROUND

[0002] Clean ground is often used in dust-free workshops, sports grounds and the like, and epoxy floor paint is often used for coating. The main components of the epoxy floor paint are epoxy resin and curing agent, which have excellent performance in terms of wear resistance and corrosion resistance. The colorant used in the epoxy floor paint is usually pigment particles stably dispersed in a liquid carrier to form a pigment color paste. This can not only avoid the defects of serious dust pollution and inconvenient metering caused by direct use of pigment particles, but also reduce the particle size distribution of the pigment particles, improve the tinting power and reduce the use amount of the pigment. Floor paint is divided into solvent type, water-based type and solvent-free type. In recent years, relevant regulations at home and abroad have increasingly strict restrictions on the emission of volatile organic compounds (VOC) in the coating industry. Solvent-free floor paint has become an important choice for improving the environmental performance of epoxy floor paint. Therefore, it is an urgent need to select a non-volatile substance as a carrier to disperse the pigment to prepare a color paste for epoxy floor paint, which has high tinting power, small fineness, good storage stability and no VOC.

[0003] Chinese patent CN107266979A discloses a color paste for epoxy floor paint. The color paste is modified by KH-560 silane coupling agent. The preparation of the color paste for epoxy floor paint adopts a grinding process to grind the pigment into micron-sized particles. If the pigment is not well dispersed in the medium, the pigment particles will collide and re-agglomerate, the particle size will become coarse, and the quality of the color paste will decrease. In addition, the color paste is prone to floating and blooming during construction.

[0004] Epoxy floor paint has high solid content. In order to have suitable coating viscosity without solvent, a common solution is to mix low-viscosity and small-molecular-mass epoxy resin with high-viscosity and large-molecular-mass epoxy resin, and then add a reactive diluent to adjust the viscosity of the system. However, the reactive diluent is usually a low-functionality epoxy resin, which will reduce the crosslinking density, resulting in reduced compactness of the coating and decreased corrosion resistance.

[0005] In recent years, there are many studies using hyperbranched polymers HBP to solve the problem of high solid coating viscosity too large, poor coating performance and so on. HBP with three-dimensional topological structure contains a large number of intramolecular cavities, which can improve the total free volume fraction of the cured product and play a toughening role. Importantly, HBP can maintain low viscosity under relatively high molecular weight, high solubility can reduce the use of solvents in the coating, and HBP contains rich end groups, which can participate in crosslinking reaction and does not produce microphase separation to affect the coating performance. At present, HBP is more used in the modification of resin and dispersant in high solid polyurethane, alkyd resin and other coatings, but the research on pigment modification is less. Chinese invention patent publication No. CN105295015A discloses a preparation method of hyperbranched polyester and its application in coatings, discloses a hyperbranched polyester modified by fatty acid, which can be used in coatings to adsorb pigment particles, reduce the viscosity of the system, reduce the pigment particle size, prevent the flocculation and coarsening of color paste, shorten the dispersion time, and enable the dispersed color paste to maintain long-term stability, effectively improve the disadvantages of floating color and other defects. Foreign invention patent publication No. US20040097685A1 discloses a new type of polymer dispersant with hyperbranched structure, which is obtained by reacting hyperbranched polyurethane and polyether derivative, and can be used as a polymer dispersant for pigments to stabilize the pigments in paint. Foreign invention patent publication No. US20100063204A1 discloses a hyperbranched ester polymer modified by rosin, and the pigment master batch containing the rosin modified ester hyperbranched polymer has excellent pigment dispersibility and minimum viscosity. Foreign invention patent publication No. WO2019072553A1 discloses a hyperbranched polymer for organic pigment dispersions and water-sensitive pigments, which comprises an aryl-modified hyperbranched polyol, and when used in a solvent-based coating composition for organic pigments, it is storage stable and can achieve certain enhanced color properties. Chinese invention patent publication No. CN117248292A discloses a preparation method of colored meta-aramid fiber, and the self-dispersing pigment used is a pigment treated by an amino-terminated aromatic hyperbranched polyamide, and there is a large distance between the pigment particles to avoid mutual collision and re-agglomeration. In addition, the self-dispersing pigment has excellent compatibility with aramid resin, which also improves the dispersibility of the pigment in the resin.

[0006] Based on the fact that HBP molecules have large space between their branches, form large steric hindrance, make the pigment particles separate, and have broad prospects in pigment modification, more HBP modified pigments need to be developed. SUMMARY

[0007] To solve the technical problems existing in the prior art, the purpose of the present application is to provide a surface modified pigment and an epoxy floor color paste and epoxy floor paint having the same.

[0008] To achieve the above-mentioned purposes, and achieve the above-mentioned technical effects, the technical scheme adopted by the present application is:

[0009] A surface modified pigment is prepared by dissolving a polyhydroxy aromatic derivative in a solvent, spraying it onto the surface of the pigment, removing the solvent, coating the pigment with the polyhydroxy aromatic derivative, and then adding a multifunctional glycidyl ether and the polyhydroxy aromatic derivative to react.

[0010] Further, the polyhydroxy aromatic derivative is dihydroxynaphthalene or dihydroxybenzene.

[0011] Further, the polyhydroxy aromatic derivative is one or a combination of 2,7-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,8-dihydroxynaphthalene, 1,4-dihydroxynaphthalene, 1,5-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, and resorcinol.

[0012] Further, the multifunctional glycidyl ether is one or a combination of glycerol triglycidyl ether, trimethylol tri-glycidyl ether, a,a',a''-1,2,3-propanetriyl tris[ω-(epoxymethoxy)] poly[oxy(methyl-1,2-ethanediyl)], and pentaerythritol glycidyl ether.

[0013] Further, the pigment is at least one of carbon black, titanium white, phthalocyanine green, iron red, iron yellow, iron black, and pigment red 49:1.

[0014] The present application also discloses a preparation method of the surface modified pigment, comprising the following steps:

[0015] First, the polyhydroxy aromatic derivative is dissolved in a solvent and sprayed onto the surface of the pigment, the solvent is removed, and a polyhydroxy aromatic derivative-coated pigment combination is obtained;

[0016] Subsequently, the polyhydroxy aromatic derivative-coated pigment combination is put into a solvent, the polyhydroxy aromatic derivative and a catalyst are dissolved again, the multifunctional glycidyl ether is added, and the reaction is carried out at 90-100°C for 2-5h, the pigment is washed after the reaction is completed, and finally the pigment is dried at 30-50°C until the mass no longer changes.

[0017] Further, the solvent is one or a combination of diethyl ether, ethyl acetate, dimethylformamide, and toluene, and the catalyst is tetrabutylammonium bromide.

[0018] The present application also discloses an application of the surface modified pigment in preparing an epoxy floor color paste.

[0019] The present application also discloses an epoxy floor color paste, which comprises the following components by weight percentage:

[0020] Surface modified pigment 20-70%

[0021] Active diluent 25-75%

[0022] Dispersant 1-5%.

[0023] The present application also discloses an epoxy floor paint comprising an epoxy floor color paste as described above, the epoxy floor paint comprising the following components by mass fraction:

[0024] Epoxy resin 30-55 parts

[0025] Filler 20-45 parts

[0026] Diluent 8-15 parts

[0027] Epoxy floor color paste 3-8 parts

[0028] Dispersant 0.3-1.5 parts

[0029] Leveling agent 0.2-2 parts

[0030] Scratch-resistant agent 0.2-1 part

[0031] Dust-proof agent 0.2-1 part

[0032] Defoaming agent 0.2-1 part.

[0033] Compared with the prior art, the present application has the following beneficial effects:

[0034] The present application discloses a surface modified pigment, an epoxy floor color paste and an epoxy floor paint comprising the same, the surface modified pigment is prepared by dissolving a polyhydroxy aromatic derivative in a solvent, spraying the solvent on the surface of the pigment, removing the solvent, and then adding a polyfunctional glycidyl ether and the polyhydroxy aromatic derivative to react, the polyhydroxy aromatic derivative has an aromatic group, which is more easily attached to the surface of the pigment, and is beneficial to better coating and modification, and the formation of a hyperbranched chain structure on the surface of the pigment is beneficial to improving the dispersion stability of the pigment, the epoxy floor color paste prepared by using the surface modified pigment has the advantages of small fineness, low viscosity and storage stability, and the epoxy floor paint prepared by using the epoxy floor color paste does not have the problem of color floating during construction. DETAILED DESCRIPTION

[0035] The present application will be described in detail below, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the protection scope of the present application can be more clearly and definitely defined.

[0036] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

[0037] In one aspect, the present application discloses a surface modified pigment, which is prepared by dissolving a polyhydroxy aromatic derivative in a solvent, spraying the solution onto the surface of the pigment, and then removing the solvent and reacting the polyhydroxy aromatic derivative with a polyfunctional glycidyl ether to form a hyperbranched chain structure on the surface of the pigment. The epoxy groups in the polyfunctional glycidyl ether react with the phenolic hydroxyl groups in the polyhydroxy aromatic derivative to lose one molecule of water, and one polyfunctional glycidyl ether reacts with multiple polyhydroxy aromatic derivatives, while the polyhydroxy aromatic derivative that has already participated in the reaction reacts with multiple polyfunctional glycidyl ethers. The hyperbranched chain structure on the surface of the pigment is beneficial to improve the dispersion stability of the pigment. The epoxy floor color paste prepared by using the surface modified pigment has the advantages of small fineness, low viscosity, and storage stability. The epoxy floor paint prepared by using the epoxy floor color paste does not have the problem of floating color during the construction process.

[0038] In the present application, the polyhydroxy aromatic derivative is a dihydroxy aromatic derivative, which is dihydroxynaphthalene or dihydroxybenzene, preferably dihydroxynaphthalene, and can be one or a combination of 2,7-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,8-dihydroxynaphthalene, 1,4-dihydroxynaphthalene, 1,5-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, and resorcinol.

[0039] The solvent is a solvent capable of dissolving the polyhydroxy aromatic derivative, and can be one or a combination of diethyl ether, ethyl acetate, dimethylformamide (DMF), toluene, etc., which can be removed by vacuum distillation, etc.

[0040] The polyfunctional glycidyl ether refers to a molecule containing three or more glycidyl ether groups, and can be one or a combination of glycerol triglycidyl ether, trimethylol tri-glycidyl ether, a,a',a''-1,2,3-propanetriyl tris[ω-(epoxymethoxy)] poly[oxy(methyl-1,2-ethanediyl)], and pentaerythritol glycidyl ether.

[0041] The pigment is at least one of carbon black, titanium white, phthalocyanine green, iron red, iron yellow, iron black, and pigment red 49:1.

[0042] In another aspect, the present application also discloses a preparation method of the surface modified pigment, which comprises the following steps:

[0043] First, 1-3 parts by mass of the polyhydroxy aromatic derivative is dissolved in 80-300 parts by mass of a solvent, sprayed onto 100 parts by mass of the pigment, and the solvent is removed by vacuum distillation or the like to obtain a polyhydroxy aromatic derivative-coated pigment combination;

[0044] Subsequently, the polyhydroxy aromatic derivative-coated pigment combination is put into a dimethylformamide solvent, 1-3 parts by mass of the polyhydroxy aromatic derivative and a catalyst tetra-n-butylammonium bromide are further dissolved, 3-10 parts by mass of a multifunctional glycidyl ether is further added, nitrogen gas is introduced, and the reaction is carried out at 90-100°C for 2-5 hours. After the reaction is completed, the pigment is washed several times in diethyl ether and hot water, respectively, and finally the pigment is dried at 30-50°C until the mass no longer changes.

[0045] The present application also discloses an epoxy floor color paste, comprising the following components by weight percentage:

[0046] Surface-modified pigment 20-70%

[0047] Active diluent 25-75%

[0048] Dispersant 1-5%.

[0049] The present application also discloses a preparation method of the epoxy floor color paste, comprising the following steps:

[0050] 1) The active diluent is added to the dispersant, and the surface-modified pigment is dispersed under stirring to obtain a premixed pigment slurry;

[0051] 2) The premixed pigment slurry is ground, filtered and defoamed to obtain the required epoxy floor color paste.

[0052] The active diluent is a mixture of epoxy soybean oil and polypropylene glycol diglycidyl ether, and the dispersant is glycerol monostearate.

[0053] The present application also discloses an epoxy floor paint, comprising the following components by mass fraction:

[0054] Epoxy resin 30-55 parts

[0055] Filler 20-45 parts

[0056] Diluent 8-15 parts

[0057] Epoxy floor color paste 3-8 parts

[0058] Dispersant 0.3-1.5 parts

[0059] Leveling agent 0.2-2 parts

[0060] Scratch-resistant agent 0.2-1 part

[0061] Dust-proof agent 0.2-1 part

[0062] Defoaming agent 0.2-1 part.

[0063] The filler is barium sulfate or heavy calcium carbonate, preferably barium sulfate, which is used as a body pigment in the coating. The application of barium sulfate in the coating plays an important role in improving the thickness, wear resistance, water resistance, heat resistance, surface hardness, impact resistance and other properties of the paint film. In addition, barium sulfate has high reflectivity in the wavelength range of 300-400 microns, which can protect the paint film from light aging and is an effective and inexpensive white inorganic light stabilizer. Because the oil absorption of barium sulfate is low, it has a high filling amount, so it can reduce the cost of the coating.

[0064] The dispersant is selected from Zhanxin VXW 6208 nonionic dispersant, Evka EFKA-5210 wet dispersant or Bick BYK-2070 wet dispersant, etc.

[0065] The leveling agent is selected from polyacrylic acid, carboxymethyl cellulose, polyester modified polysiloxane, polyether modified polysiloxane and polymethylphenylsiloxane, etc.

[0066] The anti-scratch agent is selected from BASF wax powder AF-30, etc.

[0067] The dust-proof agent is selected from ionic liquid antistatic agent, styrene phenol SP, etc.

[0068] The defoaming agent is selected from phenylethanol oleate, polydimethylsiloxane, polyoxyethylene polyoxypropanol amine ether and polyoxyethylene polyoxypropylene pentaerythritol ether, etc.

[0069] Example 1

[0070] A preparation method of a surface modified pigment, comprising the following steps:

[0071] First, 1 part by mass of 2,7-dihydroxynaphthalene is dissolved in 100 parts by mass of diethyl ether, sprayed onto the surface of 100 parts by mass of phthalocyanine green pigment, and the diethyl ether is removed by vacuum distillation to obtain a 2,7-dihydroxynaphthalene coated pigment assembly. 2,7-dihydroxynaphthalene has an aromatic group and can easily adhere to the surface of the pigment, achieving better coating and modification;

[0072] 100 parts by mass of 2,7-dihydroxynaphthalene coated pigment assembly is put into 300 parts by mass of dimethylformamide DMF, 2 parts by mass of 2,7-dihydroxynaphthalene and 0.02 parts by mass of tetrabutylammonium bromide are dissolved, 4.5 parts by mass of glycerol triglycidyl ether is added, nitrogen is introduced, and the reaction is carried out at 95°C for 3h. After the reaction is completed, the pigment is washed in diethyl ether and hot water for three times respectively, and then the pigment is dried at 40°C until the mass no longer changes to obtain the desired surface modified pigment.

[0073] Example 2

[0074] The difference between this example and Example 1 is that this example uses trimethylol tri glycidyl ether (specifically trimethylol propane tri glycidyl ether) instead of glycerol tri glycidyl ether of Example 1.

[0075] The rest is the same as Example 1.

[0076] Example 3

[0077] The difference between this example and Example 1 is that this example uses 1,3-dihydroxynaphthalene instead of 2,7-dihydroxynaphthalene of Example 1, and uses iron red pigment instead of phthalocyanine green pigment of Example 1.

[0078] The rest is the same as Example 1.

[0079] Example 4

[0080] The difference between this example and Example 1 is that this example uses iron red pigment instead of phthalocyanine green pigment of Example 1.

[0081] The rest is the same as Example 1.

[0082] Example 5

[0083] The difference between this example and Example 1 is that this example uses resorcinol instead of 2,7-dihydroxynaphthalene of Example 1, and uses trimethylol tri glycidyl ether (specifically trimethylol propane tri glycidyl ether) instead of glycerol tri glycidyl ether of Example 1.

[0084] The rest is the same as Example 1.

[0085] Example 6

[0086] A preparation method of an epoxy floor color paste, comprising the following steps:

[0087] 1) According to the mass fraction, 9 parts of epoxy soybean oil and 40 parts of polypropylene glycol diglycidyl ether are uniformly mixed, and after mixing, heated to 50℃, then 1 part of glycerol monostearate is added, uniformly dispersed, and then 50 parts of the surface modified pigment prepared in Example 1 is added under high speed stirring, the speed is 1500 rpm, and the dispersion time is 15 min, to obtain a premixed pigment slurry;

[0088] 2) The premixed pigment slurry is ground 5 times by a sand mill, filtered and defoamed to obtain the required epoxy floor color paste.

[0089] Example 7

[0090] The difference between this example and Example 6 is that this example adds 60 parts of the surface modified pigment prepared in Example 1 and 30 parts of polypropylene glycol diglycidyl ether.

[0091] The rest is the same as Example 6.

[0092] Example 8

[0093] The difference between this example and Example 6 is that this example adds 70 parts of the surface-modified pigment prepared in Example 1 and 20 parts of polypropylene glycol diglycidyl ether.

[0094] The rest is the same as Example 6.

[0095] Example 9

[0096] The difference between this example and Example 6 is that this example adds 70 parts of the surface-modified pigment prepared in Example 1, 8 parts of epoxy soybean oil, 20 parts of polypropylene glycol diglycidyl ether and 2 parts of glyceryl monostearate.

[0097] The rest is the same as Example 6.

[0098] Example 10

[0099] The difference between this example and Example 7 is that this example adds 60 parts of the surface-modified pigment prepared in Example 2.

[0100] The rest is the same as Example 7.

[0101] Example 11

[0102] The difference between this example and Example 7 is that this example adds 60 parts of the surface-modified pigment prepared in Example 3.

[0103] The rest is the same as Example 7.

[0104] Example 12

[0105] The difference between this example and Example 7 is that this example adds 60 parts of the surface-modified pigment prepared in Example 4.

[0106] The rest is the same as Example 7.

[0107] Example 13

[0108] The difference between this example and Example 7 is that this example adds 60 parts of the surface-modified pigment prepared in Example 5.

[0109] The rest is the same as Example 7.

[0110] Comparative Example 1

[0111] The difference between this comparative example and Example 1 is that this comparative example uses a commercially available unmodified phthalocyanine green instead of the surface-modified pigment of Example 1.

[0112] The rest is the same as Example 1.

[0113] Comparative Example 2

[0114] The difference between this comparative example and Example 1 is that this comparative example uses 2,7-dihydroxynaphthalene-coated pigment combination instead of the surface-modified pigment of Example 1.

[0115] The rest is the same as Example 1.

[0116] Comparative Example 3

[0117] The difference between this comparative example and Example 1 is that this comparative example uses 1.4-butanediol diglycidyl ether instead of glycerol triglycidyl ether of Example 1.

[0118] The rest is the same as Example 1.

[0119] Comparative Example 4

[0120] The difference between this comparative example and Example 1 is that this comparative example uses 2-hydroxynaphthalene instead of 2,7-dihydroxynaphthalene of Example 1.

[0121] The rest is the same as Example 1.

[0122] Comparative Example 5

[0123] The difference between this comparative example and Example 7 is that this comparative example adds 60 parts of the surface-modified pigment prepared in Comparative Example 1.

[0124] The rest is the same as Example 7.

[0125] Comparative Example 6

[0126] The difference between this comparative example and Example 7 is that this comparative example adds 60 parts of the surface-modified pigment prepared in Comparative Example 2.

[0127] The rest is the same as Example 7.

[0128] Comparative Example 7

[0129] The difference between this comparative example and Example 7 is that this comparative example adds 60 parts of the surface-modified pigment prepared in Comparative Example 3.

[0130] The rest is the same as Example 7.

[0131] Comparative Example 8

[0132] The difference between this comparative example and Example 7 is that this comparative example adds 60 parts of the surface-modified pigment prepared in Comparative Example 4.

[0133] The rest is the same as Example 7.

[0134] The formula table of the pigments of Examples 1-5 and Comparative Examples 1-4 is shown in Table 1.

[0135] Table 1

[0136]

[0137] The formulation table of epoxy floor color paste of Examples 6-13 and Comparative Examples 5-8 is shown in Table 2.

[0138] Table 2

[0139]

[0140] Color paste performance test:

[0141] 1. Fineness test: 50 μm fineness meter was used to test according to the method specified in the standard "GB / T 6753.1-2007 Determination of the ground and polished fineness of paint, varnish and printing ink".

[0142] 2. Stability test: the prepared color paste was respectively placed at room temperature for 90 days after being sealed, and the storage stability of the color paste was judged by observing whether there was obvious pigment particle precipitation, flocculation and other serious stability-affecting conditions.

[0143] 3. Finger rub color difference test: the amount of curing agent was calculated according to the epoxy value and mixed uniformly with the epoxy floor paint shown in Table 3, then a trowel with 3 mm teeth was used to perform scraping on the treated asbestos board, and when the wet film was semi-cured, finger rubbing (60 r / min in the same direction) was performed, and the color difference between the finger rubbing and non-finger rubbing parts was measured by a spectrophotometer.

[0144] Table 3

[0145]

[0146]

[0147] The performance test results are shown in Table 4, wherein in the storage stability test, "√" indicates that there is no abnormality in visual observation, and "X" indicates that there is obvious pigment particle precipitation, flocculation, viscosity increase, etc. which leads to the inability to flow at room temperature. In the finger rub color difference test, when the finger rub color difference is greater than 0.5, the coating layer is prone to appear mottling problem during construction.

[0148] Table 4

[0149]

[0150] The following conclusions can be obtained from Table 4:

[0151] Comparing Example 7 with Examples 10-13, it can be seen that the color paste prepared by using the surface-modified pigments of Examples 1-5 has different fineness, all of which are not more than 20 μm, which is obviously smaller than that of Comparative Examples 5-8. Compared with glycerol triglycidyl ether, trimethylolpropane triglycidyl ether is more likely to obtain color paste with small fineness. The color paste of Example 9 has the smallest fineness of 12 μm. The color paste of Example 10 prepared by using the surface-modified pigment of Example 2 has a fineness of 14 μm. The color paste of Example 11 prepared by using the surface-modified pigment of Example 3 has the largest fineness of 20 μm and the largest rub color difference of 0.47. This is because the surface-modified pigment of Example 2 uses 2,7-dihydroxynaphthalene, phthalocyanine green and trimethylolpropane triglycidyl ether. The hydroxyl position of 2,7-dihydroxynaphthalene is symmetrical and is distributed along the naphthalene ring. The hydroxyl on the aromatic ring is more complete in the reaction. The product has large steric hindrance after the reaction, so that the pigment has smaller particle size after dispersion. The surface-modified pigment of Example 3 uses 1,3-dihydroxynaphthalene, iron red and glycerol triglycidyl ether. The iron red pigment is an inorganic substance. The hydroxyl position of 1,3-dihydroxynaphthalene is less symmetrical and is not complete in the reaction. The superposition of these factors leads to that the fineness and the rub color difference of Example 11 are obviously larger than those of other examples. Similarly, the surface-modified pigment of Example 4 uses 2,7-dihydroxynaphthalene, iron red and glycerol triglycidyl ether, which leads to that the fineness and the rub color difference of the color paste prepared by using the surface-modified pigment of Example 4 are only second to those of Example 11;

[0152] Comparing Example 10 with Example 13, it can be seen that 2,7-dihydroxynaphthalene is more likely to obtain color paste with small fineness and rub color difference than resorcinol. The possible reason is that the naphthalene ring is more suitable for the pigment than the benzene ring.

[0153] Comparing Example 7 with Comparative Example 5, it can be seen that the surface-modified pigment of the epoxy floor color paste of Comparative Example 5 uses unmodified phthalocyanine green, which leads to that the fineness and the rub color difference of Comparative Example 5 are obviously larger than those of Example 7. The color paste of Comparative Example 5 has poor stability, and obvious pigment particle precipitation, flocculation, viscosity increase and other situations occur, which leads to that the color paste cannot flow at room temperature. It is shown that only the surface-modified pigment can obtain the required epoxy floor color paste.

[0154] Comparing Example 7 with Comparative Example 6, it can be seen that the surface-modified pigment of the epoxy floor color paste of Comparative Example 6 uses 2,7-dihydroxynaphthalene coated pigment combination, which leads to that the fineness and the rub color difference of Comparative Example 6 are obviously larger than those of Example 7. The color paste of Comparative Example 6 has poor stability, and obvious pigment particle precipitation, flocculation, viscosity increase and other situations occur, which leads to that the color paste cannot flow at room temperature. It is shown that only the surface-modified pigment can obtain the required epoxy floor color paste.

[0155] Comparing example 7 with comparative example 7, it can be seen that the epoxy floor color paste of comparative example 7 uses 1.4-butanediol diglycidyl ether, which results in that the fineness and rubbing color difference of comparative example 7 are obviously larger than those of example 7, and the possible reason is that 1.4-butanediol diglycidyl ether has two epoxy groups, can only carry out chain growth reaction and cannot form more branched chains, so that the pigment dispersion performance is reduced. It is illustrated that only the specific type of multifunctional glycidyl ether can obtain the required epoxy floor color paste;

[0156] Comparing example 7 with comparative example 8, it can be seen that the epoxy floor color paste of comparative example 8 coats the pigment with 2-hydroxynaphthalene first, and 2-hydroxynaphthalene only contains one hydroxyl group, cannot form continuous growth of branched chains of pigment surface modifiers, and cannot form hyperbranched modified structure, which results in that the paste fineness and rubbing color difference of comparative example 8 are obviously larger than those of example 7, and the paste stability of comparative example 8 is poor, obvious pigment particle precipitation, flocculation, viscosity increase, etc. occur, which leads to that the paste cannot flow at room temperature. It is illustrated that only the specific type of multifunctional aromatic derivative can obtain the required epoxy floor color paste.

[0157] The parts or structures not specifically described in the present application can adopt the prior art or existing products, which will not be repeated here.

[0158] The above is only the embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A surface-modified pigment, characterized in that, The surface-modified pigment is prepared by coating the pigment with a polyhydroxy aromatic derivative and then reacting it with a polyfunctional glycidyl ether and a polyhydroxy aromatic derivative.

2. The surface-modified pigment according to claim 1, characterized in that, The polyhydroxy aromatic derivative is dihydroxynaphthalene or dihydroxybenzene.

3. The surface-modified pigment according to claim 2, characterized in that, The polyhydroxy aromatic derivative is one or a combination of several of the following: 2,7-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,8-dihydroxynaphthalene, 1,4-dihydroxynaphthalene, 1,5-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, and resorcinol.

4. The surface-modified pigment according to claim 1, characterized in that, The multifunctional glycidyl ether is one or a combination of several of the following: glycerol triglycidyl ether, trimethylol triglycidyl ether, a,a',a”-1,2,3-propyltrimethyltri[ω-(epoxymethoxy)]poly[oxy(methyl-1,2-ethylenediyl)], and pentaerythritol glycidyl ether.

5. The surface-modified pigment according to claim 1, characterized in that, The pigment is at least one of carbon black, titanium dioxide, phthalocyanine green, iron oxide red, iron oxide yellow, iron oxide black, and pigment red 49:

1.

6. A method for preparing a surface-modified pigment according to any one of claims 1-5, characterized in that, Includes the following steps: First, the polyhydroxy aromatic derivative is dissolved in a solvent and sprayed onto the pigment surface. The solvent is then removed to obtain a pigment assembly coated with the polyhydroxy aromatic derivative. Subsequently, the pigment assembly coated with polyhydroxy aromatic derivatives was placed in a solvent, followed by the addition of polyhydroxy aromatic derivatives and a catalyst for dissolution, and then polyfunctional glycidyl ether was added. The mixture was reacted at 90-100℃ for 2-5 hours. After the reaction was completed, the pigments were washed, and finally the pigments were dried at 30-50℃ until their quality no longer changed.

7. The method for preparing a surface-modified pigment according to claim 6, characterized in that, The solvent is one or a combination of several of diethyl ether, ethyl acetate, dimethylformamide, and toluene, and the catalyst is tetrabutylammonium bromide.

8. The application of the surface-modified pigment according to any one of claims 1-5 in the preparation of epoxy flooring color paste.

9. The epoxy flooring colorant according to claim 8, characterized in that, The components include the following weight percentages: Surface-modified pigments 20-70% Reactive diluent 25-75% Dispersant 1-5%.

10. An epoxy floor coating, characterized in that, The epoxy floor paint includes the epoxy floor pigment of claim 9, wherein the epoxy floor paint comprises the following components in parts by weight: 30-55 parts epoxy resin 20-45 parts of filler 8-15 parts diluent 3-8 parts epoxy floor colorant Dispersant 0.3-1.5 parts Leveling agent 0.2-2 parts Anti-scratch agent 0.2-1 part Dust suppressant 0.2-1 part 0.2-1 part defoamer.

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