High-weather-resistance high-dispersity water-based color paste and preparation method thereof

Abstract

The invention belongs to the technical field of paint printing ink, and particularly discloses high-weather-resistance high-dispersity water-based color paste and a preparation method thereof. The water-based color paste comprises the following raw material components in parts by weight: 2-10 parts of an organic silicon hyperdispersant, 30-40 parts of pigment, 3-10 parts of a cosolvent, 1-3 parts of a pH stabilizer, 0.5-1 part of an organic silicon defoamer, 0.2-0.5 part of a bactericide and 45-60 parts of deionized water, the water-based color paste prepared by the invention can realize the functions of high weather resistance, high dispersion stability, substrate wetting, high color development and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of coating inks, and particularly relates to a water-based color paste with high weather resistance and high dispersibility and a preparation method thereof. Background Art

[0002] As the core coloring component of the coating ink system, the water-based color paste converts organic / inorganic pigments into a high-concentration dispersion system through a precision processing process. Its core preparation process involves three key steps: First, the surface active substance is used to perform interfacial modification on the pigment, and the mechanical grinding method is used to break the particle aggregates, and finally a stable colloidal dispersion system is constructed. During the dispersion process, in the wetting stage, the base material is used to replace the gas phase medium and impurities on the particle surface; in the deagglomeration stage, the focus is on separating the aggregates without destroying the original crystal structure; in the stabilization stage, physical or chemical means are used to prevent the particles from re-aggregating. It is particularly worth noting that the stability of the dispersion system directly determines the coloring strength and storage performance. The flocculation phenomenon not only reduces the light scattering efficiency and causes the hiding power to decay, but also affects important parameters such as the gloss of the paint film and the critical volume concentration.

[0003] In view of the special physical properties of the water-based system, the dispersion stabilization mechanism mainly relies on the principle of electrostatic stabilization. Due to the high surface tension characteristics of the water phase, a composite additive system needs to be used to achieve effective wetting: the anionic polymer dispersant forms a strong adsorption with the polar surface of the pigment through the carboxylic acid group. The hydrophilic chain segment in its molecular structure enhances the water phase compatibility, and the hydrophobic chain segment constructs a steric hindrance layer. In practical applications, amine compounds are often used to adjust the pH value of the system to the range of 8-9, which not only ensures the dissociation degree of the carboxylic acid group but also avoids excessive alkalinity causing pigment hydrolysis. Experimental data shows that the ideal dispersion state does not reach the primary particle state of complete depolymerization, but forms microflocs with a particle size of 200-500 nm. This metastable structure can not only maintain the coloring strength but also maintain a storage stability of at least 6 months. It is worth noting that the molecular weight distribution of the dispersant has a significant impact on the deflocculation effect. When the weight average molecular weight is controlled within 5000-15000 Da, the adsorption strength and the steric stabilization effect can be balanced.

[0004] The traditional coloring process directly adds pigment powder to the base material, which has defects such as a wide particle size distribution and poor coloring reproducibility, and is prone to interface defects such as floating color and blooming. Modern color paste technology can control the pigment particle size within D90<1μm through special dispersants and optimized grinding processes, increasing the coloring power by more than 40%. The current technical bottleneck lies in how to balance weather resistance and dispersion stability: phthalocyanine-based organic pigments have excellent dispersibility but poor ultraviolet resistance; while inorganic iron-based pigments have excellent weather resistance but have problems such as difficult dispersion and easy sedimentation. Developing new core-shell structure pigments combined with zwitterionic dispersants may be an effective way to achieve the simultaneous improvement of high weather resistance and high stability, which has important value for promoting the application of water-based coatings in fields such as building facades and automotive repairs. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, a water-based color paste with high weather resistance and high dispersibility and a preparation method thereof are provided, and the water-based color paste can achieve functions such as high weather resistance, high dispersion stability, substrate wetting, and high color development.

[0006] To solve the above technical problems, a first aspect of the present invention provides a water-based color paste with high weather resistance and high dispersibility. The raw material components of the water-based color paste include, by weight: 2-10 parts of an organosilicon hyperdispersant, 30-40 parts of a pigment, 3-10 parts of a cosolvent, 1-3 parts of a pH stabilizer, 0.5-1 part of an organosilicon defoamer, 0.2-0.5 part of a bactericide, and 45-60 parts of deionized water;

[0007] Preferably, the structural formula of the organosilicon hyperdispersant is as shown in formula (1):

[0008]

[0009] In formula (1): a = 0-500, b = 1-100, c = 1-50, d = 1-100, e = 1-50, x = 1-20, y = 10-30;

[0010] Preferably, the pigment is selected from at least one of organic pigments and inorganic pigments.

[0011] Preferably, the cosolvent is selected from at least one of ethanol, isopropanol, ethylene glycol, 1,2-propanediol, 1,4-butanediol, glycerol, diethylene glycol, triethylene glycol, polyethylene glycol-200, and polyethylene glycol-400. Further preferably, the cosolvent is selected from at least one of ethylene glycol, 1,2-propanediol, diethylene glycol, and polyethylene glycol-200.

[0012] Preferably, the pH value stabilizer is selected from at least one of potassium phosphate and potassium tripolyphosphate.

[0013] Preferably, the structural formula of the organosilicon defoamer is as shown in formula (2):

[0014]

[0015] In formula (2): n = 1-20;

[0016] Preferably, the bactericide is selected from isothiazolinone bactericides.

[0017] A second aspect of the present invention provides a preparation method of the above water-based color paste, including the following steps:

[0018] Mix the silicone hyperdispersant, pigment, cosolvent, pH stabilizer, silicone defoamer and deionized water together, disperse them at high speed using a high-speed dispersant, and then transfer them to a sand mill for continuous grinding; finally, add a bactericide and cool down to obtain the aqueous color paste.

[0019] Preferably, the speed of the high-speed dispersion is 1000 - 10000 revolutions per minute; more preferably, the speed of the high-speed dispersion is 3000 - 5000 revolutions per minute.

[0020] Preferably, the temperature of the high-speed dispersion is 10 - 50 °C; more preferably, the heating temperature is 15 - 30 °C.

[0021] Preferably, the time of the high-speed dispersion is 0.5 - 3 hours; more preferably, the time of the high-speed dispersion is 1 - 2 hours.

[0022] Preferably, the temperature of the grinding is 15 - 80 °C; more preferably, the temperature of the grinding is 25 - 50 °C.

[0023] Preferably, the time of the grinding is 1 - 8 hours; more preferably, the time of the grinding is 2 - 4 hours.

[0024] Preferably, the temperature of the cooling is 10 - 40 °C; more preferably, the temperature of the cooling is 20 - 30 °C.

[0025] Advantages of the present invention:

[0026] (1) The present invention uses a silicone hyperdispersant with a specific structure to replace traditional polyacrylate dispersants and anionic or non-ionic surfactants to achieve wetting and stabilization of pigments. The silicone hyperdispersant of the present invention is modified with multiple functional groups, and multiple active functional groups synergistically enhance the super-dispersion stability of pigments. Among them, the hydrophilic polyoxyethylene (EO) chain segment in the long polyether chain segment associates with multiple water molecules in the aqueous dispersion system, and stabilizes the dispersed pigment particles through entropy repulsion; the lipophilic polyoxypropylene (PO) chain segment combines with organic pigments to form a stable dispersion; the polyether sulfosuccinate chain segment with an anionic-nonionic structure can strongly adsorb on the pigment, form a firm "anchoring" point, and form a dense ionic charge layer on the pigment surface, making the pigment dispersion stable through electrostatic repulsion, greatly reducing the flocculation and aggregation of pigment particles due to Brownian motion; low-polarity groups such as phenyl / long-chain alkyl groups synergistically act with pigment particles to form a relatively thick adsorption layer through van der Waals forces, enhancing the ordered arrangement and stabilization of pigment particles.

[0027] (2) The silicone hyperdispersant used in the present invention not only has a super-dispersion effect but also has the unique low surface tension property of silicone surfactants, and its surface tension is lower than 27 mm2 / s, much lower than that of conventional anionic or non-ionic surfactants, can quickly wet the surface of pigments, especially organic pigments, and replace the use of conventional wetting agents. At the same time, the obtained aqueous color paste also has a reduced surface tension, and better wetting and dispersing properties can be obtained when used on difficult-to-wet surfaces such as plastics and metals, resulting in a uniform and full-color printing effect.

[0028] (3) The alkynediol polyoxypropylene (PO) ether-modified trisiloxane structure adopted in the present invention is used as an organosilicon defoaming agent for pigment grinding. In the aqueous color paste system, in addition to playing an excellent defoaming role under strong dispersion and grinding conditions, its special molecular structure endows it with high surface activity, which can quickly wet the pigment surface and cooperate with the organosilicon superdispersant to form an organosilicon coating layer on the pigment surface, reducing the risk of flocculation and agglomeration of dispersed pigment particles during storage, and greatly improving the water resistance and weather resistance of the color paste film after filming.

[0029] (4) The present invention uses potassium phosphate salts as pH value stabilizers. Compared with organic amine-based pH value stabilizers, which have problems such as easy volatilization and unstable pH values, the alkalinity and non-volatility of potassium phosphate salts can ensure that the pH value remains persistently stable above the isoelectric point (iep) of all pigments, ensuring that the pigment particle surface carries a negative charge, and stabilizing the pigment particles through electrostatic repulsion and synergistic action with the organosilicon superdispersant. At the same time, potassium phosphate can ensure that the dry film is not easily extracted by water on the coating surface to form hydrophilic salt spots. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0031] Figure 1 It is the particle size diagram of the aqueous color paste prepared in Example 1 of the present invention;

[0032] Figure 2 It is the particle size diagram of the aqueous color paste prepared in Comparative Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0033] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, will detail the specific implementation manners, structures, features and their effects according to the present invention.

[0034] At the same time, for the raw materials not detailed below, they are all commercially available products; the process steps or preparation methods not detailed are the process steps or preparation methods known to those skilled in the art. Among them, the purchase situations of some reagents and raw materials are as follows:

[0035] Organosilicon superdispersant and organosilicon defoaming agent: Purchased from Guangdong Jinbai Chemical Co., Ltd.

[0036] Example 1

[0037] A preparation method of an aqueous color paste, comprising the following steps:

[0038] Mix 20 grams of organosilicon hyperdispersant [the structural formula is as shown in formula (1), and a = 0, b = 100, c = 20, d = 1, e = 50, x = 5, y = 15], 300 grams of phthalocyanine blue pigment, 50 grams of ethylene glycol, 20 grams of potassium tripolyphosphate, 7 grams of organosilicon defoamer [the structural formula is as shown in formula (2), and n = 1] and 600 grams of deionized water together, and use a high-speed disperser to disperse at a high speed at 30 °C and a speed of 3000 revolutions per minute for 1 hour, then transfer to a sand mill and grind at 50 °C for 4 hours, add 3 grams of bactericide and then cool down to 25 °C to obtain the aqueous color paste of this example.

[0039] Example 2

[0040] A preparation method of an aqueous color paste, comprising the following steps:

[0041] Mix 50 grams of organosilicon hyperdispersant [the structural formula is as shown in formula (1), and a = 100, b = 1, c = 50, d = 100, e = 1, x = 5, y = 18], 400 grams of phthalocyanine blue pigment, 60 grams of 1,2-propanediol, 30 grams of potassium tripolyphosphate, 5 grams of organosilicon defoamer [the structural formula is as shown in formula (2), and n = 10] and 450 grams of deionized water together, and use a high-speed disperser to disperse at a high speed at 20 °C and a speed of 4000 revolutions per minute for 1.5 hours, then transfer to a sand mill and grind at 40 °C for 3 hours, add 5 grams of bactericide and then cool down to 20 °C to obtain the aqueous color paste of this example.

[0042] Example 3

[0043] A preparation method of an aqueous color paste, comprising the following steps:

[0044] Mix 80 grams of organosilicon hyperdispersant [the structural formula is as shown in formula (1), and a = 500, b = 70, c = 1, d = 30, e = 20, x = 1, y = 10], 350 grams of phthalocyanine blue pigment, 100 grams of diethylene glycol, 10 grams of potassium phosphate, 7 grams of organosilicon defoamer [the structural formula is as shown in formula (2), and n = 10] and 450 grams of deionized water together, and use a high-speed disperser to disperse at a high speed at 20 °C and a speed of 4000 revolutions per minute for 1.5 hours, then transfer to a sand mill and grind at 40 °C for 3 hours, add 5 grams of bactericide and then cool down to 20 °C to obtain the aqueous color paste of this example.

[0045] Example 4

[0046] A preparation method of an aqueous color paste, comprising the following steps:

[0047] Mix 100 g of organosilicon hyperdispersant [with the structural formula shown in formula (1), where a = 300, b = 30, c = 20, d = 70, e = 20, x = 10, y = 30], 300 g of titanium blue pigment, 30 g of polyethylene glycol - 200, 20 g of potassium phosphate, 10 g of organosilicon defoamer [with the structural formula shown in formula (2), where n = 20], and 538 g of deionized water together. Use a high - speed disperser to disperse at a high speed of 4500 revolutions per minute at 25 °C for 1 hour, then transfer to a sand mill and grind at 35 °C for 2 hours. After adding 2 g of bactericide, cool down to 30 °C to obtain the aqueous color paste of this example.

[0048] Comparative Example 1

[0049] A method for preparing an aqueous color paste, comprising the following steps:

[0050] Mix 100 g of polyacrylate resin dispersant, 300 g of titanium blue pigment, 30 g of polyethylene glycol - 200, 20 g of potassium phosphate, 10 g of organosilicon defoamer [with the structural formula shown in formula (2), where n = 20], and 538 g of deionized water together. Use a high - speed disperser to disperse at a high speed of 4500 revolutions per minute at 25 °C for 1 hour, then transfer to a sand mill and grind at 35 °C for 2 hours. After adding 2 g of bactericide, cool down to 30 °C to obtain the aqueous color paste of this example.

[0051] Compared with Example 4, when preparing the aqueous color paste of Comparative Example 1, a polyacrylate resin dispersant is used to replace the organosilicon hyperdispersant of Example 4.

[0052] Comparative Example 3

[0053] A method for preparing an aqueous color paste, comprising the following steps:

[0054] Mix 100 g of organosilicon hyperdispersant [with the structural formula shown in formula (1), where a = 300, b = 30, c = 20, d = 70, e = 20, x = 10, y = 30], 300 g of titanium blue pigment, 30 g of polyethylene glycol - 200, 20 g of sodium phosphate, 10 g of Tego3062 organosilicon defoamer, and 538 g of deionized water together. Use a high - speed disperser to disperse at a high speed of 4500 revolutions per minute at 25 °C for 1 hour, then transfer to a sand mill and grind at 35 °C for 2 hours. After adding 2 g of bactericide, cool down to 30 °C to obtain the aqueous color paste of this example.

[0055] Compared with Example 4, when preparing the aqueous color paste of Comparative Example 2, Tego3062 organosilicon defoamer is used to replace the organosilicon defoamer of Example 4 [with the structural formula shown in formula (2), where n = 10], and sodium phosphate is used to replace the potassium phosphate of Example 4.

[0056] Comparative Example 4

[0057] A preparation method of an aqueous color paste, comprising the following steps:

[0058] Mix 50 grams of polyacrylate resin dispersant, 50 grams of polyether-modified organosiloxane [structural formula as shown in formula (3)], 300 grams of phthalocyanine blue pigment, 30 grams of polyethylene glycol-200, 20 grams of triethanolamine, 10 grams of silicone defoamer [structural formula as shown in formula (2) and n = 20], and 538 grams of deionized water together. Use a high-speed disperser to disperse at a high speed of 4500 revolutions per minute at a temperature of 25°C for 1 hour, then transfer to a sand mill and grind at 35°C for 2 hours. After adding 2 grams of fungicide, cool down to 30°C to obtain the aqueous color paste of this example.

[0059] Compared with Example 4, when preparing the aqueous color paste of Comparative Example 4, a polyacrylate resin dispersant and a polyether-modified organosiloxane are used to replace the organosilicon hyperdispersant of Example 4, and at the same time, triethanolamine is used to replace the potassium phosphate of Example 4.

[0060]

[0061] Performance test:

[0062] Perform performance tests on the aqueous color pastes prepared in Examples 1-4 of the present invention and Comparative Examples 1-4 respectively. The test methods are as follows:

[0063] Coat the aqueous color pastes of the above examples and comparative examples on glass for adhesion, solvent resistance and water resistance tests.

[0064] 1. Adhesion test

[0065] Coat the aqueous color paste on glass with a 20# wire bar, bake at 100°C for 30 minutes to harden into a film, and use a cross cutter to draw 100 squares (10×10). Then stick with a special 3M standard tape and quickly tear it off. Calculate the number of squares remaining on the substrate. The more squares remaining, the better the adhesion.

[0066] If there are 81 - 100 remaining squares, the adhesion is grade 0;

[0067] If there are 61 - 80 remaining squares, the adhesion is grade 1;

[0068] If there are 41 - 60 remaining squares, the adhesion is grade 2;

[0069] If there are 21 - 40 remaining squares, the adhesion is grade 3;

[0070] If there are 1 - 20 remaining squares, the adhesion is grade 4;

[0071] If there are 0 squares left, the adhesion is Grade 5.

[0072] 2. Solvent Resistance Test

[0073] Coat the aqueous pigment paste on the glass with a #20 wire bar, bake at 100 °C for 30 minutes to harden into a film, then wipe back and forth 10 times (weight about 1 kg) with a cotton pad dipped in alcohol or acetone, and observe whether there is color shedding to determine whether the ink is resistant to alcohol or acetone solvents.

[0074] 3. Water Resistance Test

[0075] Coat the aqueous pigment paste on the glass with a #20 wire bar, bake at 100 °C for 30 minutes to harden into a film, use a dropper to drop 1 mL of deionized water onto the surface of the paint film, after 1 h, wipe the water dry with a clean paper towel, and observe whether there is any change in the paint film.

[0076] 4. Glossiness Test

[0077] Coat the aqueous pigment paste on the glass with a #20 wire bar, bake at 100 °C for 30 minutes to harden into a film, and use a glossiness tester to measure the glossiness of the paint film.

[0078] The test results are shown in Table 1.

[0079] Table 1: Comparison Table of Performance Test Results of Aqueous Pigment Pastes Prepared in Examples 1-4 and Comparative Examples 1-4

[0080]

[0081]

[0082] As can be seen from Table 1, the aqueous pigment pastes prepared in Examples 1-4 of the present invention all have high weather resistance, salt spray resistance, chemical resistance, water resistance, high storage stability and adhesion, and the particle size (D50) < 300 nm. The prepared aqueous pigment pastes belong to the nanoscale, and the glossiness is generally above 70°; the surface tension of the aqueous pigment paste is low, and the surface tension is lower than 27 mm 2 / s, which is much lower than that of the aqueous pigment paste prepared using a conventional dispersant. The relevant properties are all significantly better than those of Comparative Examples 1-4, among which:

[0083] (1) Compared with Example 4 of the present invention, when preparing the aqueous color paste of Comparative Example 1, a polyacrylate resin dispersant was used to replace the organosilicon hyperdispersant of Example 4. The particle size of the obtained aqueous color paste was one order of magnitude larger than that of Example 4 and belonged to the micron level. Moreover, the prepared aqueous color paste had poor thick-liquid stability, high surface tension, and its solvent resistance and weather resistance were much lower than those of Example 4. This shows that due to the modification with multiple functional groups, the organosilicon hyperdispersant of the present invention has a hyperdispersing and stabilizing effect on pigments through the synergistic effect of multiple active functional groups. Among them, the hydrophilic polyoxyethylene (EO) chain segment in the long polyether chain segment associates with multiple water molecules in the aqueous dispersion system, and stabilizes the dispersed pigment particles through entropy repulsion; the lipophilic polyoxypropylene (PO) chain segment combines with the organic pigment to form a stable dispersion; the polyether succinate sulfonate chain segment with an anionic-nonionic structure can strongly adsorb on the pigment, form a firm "anchoring" point, and form a dense ionic charge layer on the pigment surface. Through electrostatic repulsion, the pigment dispersion is stabilized, greatly reducing the flocculation and aggregation of pigment particles due to Brownian motion; the synergistic effect of low-polarity groups such as phenyl / long-chain alkyl forms a relatively thick adsorption layer with the pigment particles through van der Waals forces, enhancing the ordered arrangement and stabilization of the pigment particles, and obtaining an aqueous color paste with good gloss and color development performance.

[0084] (2) Compared with Example 4 of the present invention, when preparing the aqueous color paste of Comparative Example 2, Tego3062 organosilicon defoamer was used to replace the organosilicon defoamer of Example 4 [the structural formula is shown in Formula (2) and n = 10], and sodium phosphate was used to replace the potassium phosphate of Example 4. The particle size of the prepared aqueous color paste increased significantly, and its water resistance and solvent resistance were not as good as those of Example 4. This is because the special molecular structure of the organosilicon defoamer in Example 4 endows it with high surface activity, which can quickly wet the surface of the pigment and cooperate with the organosilicon hyperdispersant to form an organosilicon coating layer on the pigment surface, reducing the risk of flocculation and aggregation of the dispersed pigment particles during storage, and at the same time greatly improving the water resistance and weather resistance of the color paste film after filming. At the same time, the alkalinity and non-volatility of potassium phosphate salts can ensure that the pH value is persistently stable above the isoelectric point (iep) of all pigments, ensuring that the pigment particle surface carries a negative charge, and stabilizing the pigment particles through electrostatic repulsion in cooperation with the organosilicon hyperdispersant. At the same time, potassium phosphate can ensure that the dry film is not easily extracted by water on the coating surface to form hydrophilic salt spots.

[0085] (3) Compared with Example 4 of the present invention, when preparing the aqueous color paste of Comparative Example 3, dodecylbenzenesulfonic acid, sodium dodecyl sulfate, nonylphenol polyoxyethylene ether (OP-10) and octamethylcyclotetrasiloxane (D4) were used to replace the organosilicon hyperdispersant in Example 4. Due to the lack of the organosilicon hyperdispersant of the present invention, the aqueous color paste obtained by using traditional small molecule surfactants is far inferior to the aqueous color paste obtained in Example 4 in terms of dispersion properties such as particle size and storage stability, as well as encapsulation tightness such as weather resistance and chemical resistance.

[0086] (4) Compared with Example 4 of the present invention, when preparing the aqueous color paste of Comparative Example 4, a polyacrylate resin dispersant and a polyether-modified organosiloxane were used to replace the organosilicon hyperdispersant in Example 4, and triethanolamine was used to replace potassium phosphate in Example 4. Due to the lack of the organosilicon hyperdispersant of the present invention, the aqueous color paste obtained by using traditional polyacrylate resin dispersants and polyether-modified organosiloxanes is far inferior to the aqueous color paste obtained in Example 4 in terms of dispersion properties such as particle size, storage stability, and glossiness (color development), as well as encapsulation tightness such as weather resistance and chemical resistance.

[0087] In summary, the aqueous color pastes prepared in Examples 1-4 of the present invention all have high weather resistance, chemical solvent resistance, water resistance, high storage stability and adhesion, and the particle size (D50) < 300 nm. The prepared aqueous color pastes belong to the nanoscale, and the glossiness is generally above 70°. The surface tension of the aqueous color paste is low, and the surface tension is lower than 27 mm 2 / s, which is much lower than the aqueous color paste prepared by using a conventional dispersant, and can quickly wet the surface of pigments, especially organic pigments, replacing the use of conventional wetting agents. The aqueous color paste of the present invention has high dispersibility and adhesion ability, and can effectively enhance the influence of pigments on harsh chemical environments (strong ultraviolet rays, strong acids, solvents, etc.). The encapsulation effect of the organosilicon hyperdispersant can endow organic pigments with higher weather resistance and greatly improve the quality of pigments. At the same time, the obtained aqueous color paste also has a reduced surface tension, and better wetting and dispersion properties can be obtained when used on difficult-to-wet surfaces such as plastics and metals, resulting in a printing effect with good color development, uniform and full color.

[0088] The above is only a preferred embodiment of the present invention, and it is not intended to limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A highly weather-resistant and highly dispersible water-based color paste, characterized by: The raw material components of the water-based color paste include an organosilicon hyperdispersant; Wherein, the organosilicon hyperdispersant is as shown in formula (1): In formula (1): a=0-500, b=1-100, c=1-50, d=1-100, e=1-50, x=1-20, y=10-30.

2. The highly weather-resistant and highly dispersible water-based color paste according to claim 1, characterized in that: The weight portion of the organosilicon hyperdispersant is 2-10 parts.

3. The highly weather-resistant and highly dispersible water-based color paste according to claim 1, characterized in that: The water-based color paste further comprises an organosilicon defoamer, the structural formula of the organosilicon defoamer is shown in formula (2): In formula (2): n=1-20.

4. The highly weather-resistant and highly dispersible water-based color paste according to claim 3, characterized in that: The organosilicon defoamer is 0.5-1 part.

5. The highly weather-resistant and highly dispersible water-based color paste according to claim 1, characterized in that: The water-based color paste also contains 30-40 parts of pigment, 3-10 parts of cosolvent, 1-3 parts of pH stabilizer, 0.2-0.5 parts of bactericide and 45-60 parts of deionized water.

6. The highly weather-resistant and highly dispersible water-based color paste according to claim 5, characterized in that: The co-solvent is selected from at least one of ethanol, isopropanol, ethylene glycol, 1,2-propylene glycol, 1,4-butylene glycol, glycerol, diethylene glycol, triethylene glycol, polyethylene glycol-200 and polyethylene glycol-400.

7. The highly weather-resistant and highly dispersible water-based color paste according to claim 5, characterized in that: The pH stabilizer is selected from at least one of potassium phosphate and potassium tripolyphosphate.

8. The highly weather-resistant and highly dispersible water-based color paste according to claim 1, characterized in that: The fungicide is selected from isothiazolinone fungicides.

9. A method for preparing the highly weather-resistant and highly dispersible water-based color paste according to any one of claims 1 to 8, characterized in that: The following steps are involved: The organosilicon superdispersant, pigment, cosolvent, pH stabilizer, organosilicon defoamer and deionized water are mixed together, fully dispersed first, then ground; and finally a bactericide is added to obtain the water-based color paste.

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