CN116396641B - Water-based cationic color paste and preparation method and application thereof - Google Patents
Water-based cationic color paste and preparation method and application thereof Download PDFInfo
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- CN116396641B CN116396641B CN202310358430.XA CN202310358430A CN116396641B CN 116396641 B CN116396641 B CN 116396641B CN 202310358430 A CN202310358430 A CN 202310358430A CN 116396641 B CN116396641 B CN 116396641B
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- 125000002091 cationic group Chemical group 0.000 title claims abstract description 86
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000000049 pigment Substances 0.000 claims abstract description 76
- 239000000843 powder Substances 0.000 claims abstract description 68
- 239000008367 deionised water Substances 0.000 claims abstract description 23
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 23
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 11
- 239000004753 textile Substances 0.000 claims abstract description 9
- 239000002023 wood Substances 0.000 claims abstract description 5
- 238000007639 printing Methods 0.000 claims abstract description 3
- 238000000227 grinding Methods 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 239000013530 defoamer Substances 0.000 claims description 14
- 239000011265 semifinished product Substances 0.000 claims description 14
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 11
- 239000011324 bead Substances 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 11
- 229910052726 zirconium Inorganic materials 0.000 claims description 11
- 239000006185 dispersion Substances 0.000 claims description 9
- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- CEYYIKYYFSTQRU-UHFFFAOYSA-M trimethyl(tetradecyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCC[N+](C)(C)C CEYYIKYYFSTQRU-UHFFFAOYSA-M 0.000 claims description 7
- 150000001768 cations Chemical class 0.000 claims description 6
- URXQDXAVUYKSCK-UHFFFAOYSA-N hexadecyl(dimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[NH+](C)C URXQDXAVUYKSCK-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- PFKRTWCFCOUBHS-UHFFFAOYSA-N dimethyl(octadecyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[NH+](C)C PFKRTWCFCOUBHS-UHFFFAOYSA-N 0.000 claims description 5
- PGQAXGHQYGXVDC-UHFFFAOYSA-N dodecyl(dimethyl)azanium;chloride Chemical compound Cl.CCCCCCCCCCCCN(C)C PGQAXGHQYGXVDC-UHFFFAOYSA-N 0.000 claims description 5
- VXKJCYOFOIIBHH-UHFFFAOYSA-N dimethyl(tetradecyl)azanium;chloride Chemical compound Cl.CCCCCCCCCCCCCCN(C)C VXKJCYOFOIIBHH-UHFFFAOYSA-N 0.000 claims description 3
- 238000000265 homogenisation Methods 0.000 claims description 3
- 239000000123 paper Substances 0.000 claims description 3
- 239000002480 mineral oil Substances 0.000 claims description 2
- 235000010446 mineral oil Nutrition 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 239000003973 paint Substances 0.000 abstract description 21
- 239000007788 liquid Substances 0.000 abstract description 19
- 238000003860 storage Methods 0.000 abstract description 8
- 239000011248 coating agent Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 6
- 230000008719 thickening Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 238000004040 coloring Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000007667 floating Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 14
- 238000005086 pumping Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- 239000002966 varnish Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 238000004043 dyeing Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 150000001767 cationic compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012875 nonionic emulsifier Substances 0.000 description 1
- 229940023462 paste product Drugs 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D17/00—Pigment pastes, e.g. for mixing in paints
- C09D17/001—Pigment pastes, e.g. for mixing in paints in aqueous medium
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention belongs to the technical field of paint color paste, and particularly relates to water-based cationic color paste, and a preparation method and application thereof. The aqueous cationic color paste consists of pigment powder, a cationic dispersing agent, a defoaming agent and deionized water, and the conductivity of the clear liquid of the pigment powder is less than 55 mu S/cm. The invention provides a water-based cationic color paste, which adopts a brand new optimized color paste formula and a processing technology, wherein D95 is less than 0.3um, pigment powder is uniformly distributed and has good storage stability after being tested by a particle size meter. In addition, the aqueous cationic color paste has a simple formula and high compatibility, and the paint and the coating obtained by using the color paste can not generate compatibility defects such as floating color, thickening, light loss and the like, and can be applied to the wood coloring, printing ink, textile or papermaking industries.
Description
Technical Field
The invention belongs to the technical field of paint color paste, and particularly relates to water-based cationic color paste, and a preparation method and application thereof.
Background
The water-based color paste is a coloring material, and has very wide application fields, including industries such as paint, leather, ink, paper, latex, textile and the like. In recent years, in order to improve the dyeing adhesive force and the glossiness of the paint surface, water-based cationic color paste is developed on the basis of non-ionic or anionic formula system color paste. Taking textile dyeing as an example, the commonly used textile is negatively charged in water, so that the color adhesion of the textile surface is stronger when the textile is dyed by using the aqueous cationic color paste. Taking the traditional water-borne wood industry as an example, the water-borne cationic color paste can achieve or exceed the gloss effect of the common double-component paint through simple spraying construction.
Chinese patent CN107447540B discloses a cationic paint color paste, which can omit the cationic modification treatment step in the original paint dyeing process, but has the following disadvantages: in order to uniformly disperse pigment powder in color paste, a large amount of surfactant (such as high molecular polymer dispersing agent and emulsifying agent) is added in the patent, the formula components of the color paste are complex, compatibility problems exist in some cationic paint, and in addition, the stability of the cationic paint color paste in the storage process is poor, and the phenomenon of coarsening occurs.
Disclosure of Invention
Aiming at the technical problems, the invention provides the water-based cationic color paste, the preparation method and the application thereof, and the compatibility of the water-based cationic color paste in cationic paint can be effectively improved by adopting a brand-new optimized color paste formula and a processing technology.
The first object of the invention is to provide an aqueous cationic color paste, which consists of pigment powder, a cationic dispersing agent, a defoaming agent and deionized water, wherein the conductivity of clear pigment powder is less than 55 mu S/cm.
The invention aims at the technical problems of poor compatibility and poor storage stability of the aqueous cationic color paste in cationic paint, and does not adopt a nonionic emulsifier, a high polymer dispersant and an alcohol solvent component, so that the formula components are greatly simplified, the compatibility of the aqueous cationic color paste in the cationic paint can be effectively improved, but the technical problems of uniform distribution of pigment powder in the color paste and improvement of the storage stability are solved.
Based on the technical problems, the invention firstly screens pigment powder, takes conventional original CI.R.254 pigment powder as an example, has higher conductivity, and can not realize normal production due to overhigh system viscosity when the pigment powder is used for directly preparing the water-based cationic color paste according to the formula and the method. The invention can effectively increase the number of the affinity groups of the surface of the pigment powder and the cationic dispersing agent and reduce the anionic surfactant carried by the pigment powder by screening the conductivity of the pigment powder.
Experiments prove that the aqueous cationic color paste prepared from CI.R.254 pigment powder with the clear liquid conductivity of 8 mu S/cm is excellent in storage stability, and has no caking, thickening and other phenomena after being stored for 30 days at 50 ℃; the product is stored for 1 year at normal temperature, and has no caking, thickening and other phenomena. In addition, the aqueous cationic color paste provided by the invention has good compatibility in cationic varnish and cationic white paint, and has no pigment agglomeration, pigment wiredrawing and other conditions after detection.
Secondly, the cationic dispersing agent is different from the common nonionic and high polymer dispersing agent, belongs to pure cationic compounds, can play a role in good dispersing performance, can be well compatible with downstream cationic resin and participates in crosslinking reaction in the film forming process; the adhesive force of the coating can be improved, and the principle is that the cationic groups can well form chemical bond with the base materials (wood, textile fabrics, pulp fibers and the like) to provide additional anchoring groups for the cationic resin.
Preferably, the pigment powder includes one of ci.r.254, p.y.110 or p.bk.7.
Preferably, the cationic dispersant comprises one or more of dodecyl dimethyl ammonium chloride, tetradecyl dimethyl ammonium chloride, hexadecyl dimethyl ammonium chloride, octadecyl dimethyl ammonium chloride, dodecyl trimethyl ammonium chloride and tetradecyl trimethyl ammonium chloride.
According to the technical scheme, on one hand, the dispersibility and the adhesive force of the water-based cation color paste can be effectively improved; on the other hand, the product spoilage caused by microorganism breeding under acidic conditions of the cationic system can be prevented.
Preferably, the defoamer is mineral oil or/and organic silicon defoamer.
As a further preference, the defoamer includes one or both of Antimussol NS 22, D-foam-r A101X and D-foam-r C732.
Preferably, the water-based cationic color paste comprises the following components in parts by mass: 25-35 parts of pigment powder, 10-20 parts of cationic dispersing agent, 0.2-0.4 part of defoamer and 44.6-64.8 parts of deionized water.
The second object of the present invention is to provide a method for preparing the aqueous cationic color paste according to any one of the above, comprising the following steps:
(1) Uniformly stirring a cationic dispersing agent, deionized water and part of defoaming agent in a high-speed dispersing machine, and then adding pigment powder for high-speed dispersion;
(2) Transferring the mixture prepared in the step (1) into a horizontal sand mill for coarse grinding to obtain a color paste semi-finished product;
(3) Transferring the color paste semi-finished product into a bar pin type horizontal sand mill for fine grinding or into a high-pressure homogenizer for homogenization to obtain color paste;
(4) Adding the rest defoamer into the color paste in the dispersing process of the high-speed dispersing machine, stirring and filtering to obtain the water-based cation color paste.
Preferably, the part of the defoaming agent accounts for 40% -60% of the total amount of the defoaming agent.
Preferably, the portion of the defoamer is 50% of the total defoamer.
Preferably, the stirring speed in the high-speed dispersing machine in the step (1) or/and the step (4) is as follows: 600r/min to 800r/min.
Preferably, the conditions for high-speed dispersion in step (1) are: the rotating speed is 800 r/min-1100 r/min.
Preferably, in the step (2), zirconium beads with the particle size of 0.6-0.8 um are adopted as grinding media, and the particle size D95 of the color paste semi-finished product is smaller than 5um.
As a further preference, in step (3) zirconium beads of 0.3mm are used as grinding medium, the color paste particle size D95<0.3 um.
The third object of the invention is to propose any one of the above aqueous cationic color paste or an aqueous cationic color paste prepared by using any one of the above preparation methods, which is applied to the wood coloration, printing ink, textile or paper industry.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention provides a water-based cationic color paste by adopting a brand new optimized color paste formula and a processing technology, wherein D95 is less than 0.3um through a particle size meter test, pigment powder is uniformly distributed, the storage stability is good, the color paste is stored at a high temperature of 50 ℃ for 30 days, the phenomena of caking, thickening and the like do not occur, and the phenomena of caking, thickening and the like do not occur when the color paste is stored for 1 year at normal temperature;
(2) The aqueous cationic color paste disclosed by the invention has the advantages of simple formula and higher compatibility, and the paint and the coating obtained by using the color paste cannot generate compatibility defects such as flooding, thickening, light loss and the like;
(3) According to the invention, the cationic dispersing agent is optimized, so that on one hand, the compatibility of color paste in cationic paint can be improved, and on the other hand, the adhesive force of the coating can be enhanced.
Detailed Description
The invention is further described below in connection with specific embodiments. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. In addition, the embodiments of the present invention referred to in the following description are typically only some, but not all, embodiments of the present invention. Therefore, all other embodiments, which can be made by one of ordinary skill in the art without undue burden, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
The measurement method of the clear liquid conductivity in the following examples and comparative examples is:
taking one of 500ml glass beakers, putting 300ml deionized water into the glass beakers, weighing 30g pigment powder while magnetically stirring, adding the pigment powder into the beakers, starting a heating key of a magnetic stirrer to heat the beakers after the pigment powder is completely immersed in water, controlling the temperature to 60+/-2 ℃, preserving the temperature for 30min, filtering the pigment liquid, taking filtered clear liquid, cooling to room temperature, and measuring the conductivity of the filtered clear liquid.
Because the conductivity of the pigment powder in the original factory is higher, in order to meet the requirement of the invention on the conductivity of the pigment powder clear liquid, the rinsing method for reducing the conductivity of the pigment powder clear liquid in the following embodiment is as follows: adding a certain amount of deionized water into a reaction kettle, adding pigment powder while stirring, and mixing the pigment powder and the deionized water according to a ratio of 100:10 parts by weight of the pigment is added, the stirring speed is increased, the temperature of the reaction kettle is increased, the high-speed stirring is carried out for 2 hours at the temperature of 80 ℃, and then the pressure filtration is carried out on pigment dispersion liquid in the reaction kettle, so as to obtain the pigment powder with low conductivity.
For convenience in describing the following examples and comparative examples, the corresponding pigment powders will be described in this section:
pigment powder a: pigment powder A was untreated CI.R.254 pigment powder, and the clear liquid conductivity of the pigment powder was determined to be 215. Mu.S/cm.
Pigment powder B: and (3) adjusting the conductivity of the clear liquid of the pigment powder A, and rinsing for one time to obtain the pigment powder B, wherein the conductivity of the clear liquid is 63 mu S/cm after measurement.
Pigment powder C: rinsing is carried out 1 time on the basis of the pigment powder B to obtain pigment powder C, and the conductivity of clear liquid is 48 mu S/cm after measurement.
Pigment powder D: rinsing is carried out 1 time on the basis of the pigment powder C to obtain pigment powder D, and the conductivity of clear liquid is 8 mu S/cm after measurement.
Pigment powder E: the pigment powder E is P.Y.110 pigment powder, and the conductivity of clear liquid is 5 mu S/cm after rinsing.
Pigment powder F: the pigment powder F is P.Y.110 pigment powder, and the clear liquid conductivity is 55 mu S/cm after rinsing.
Example 1
The aqueous cationic color paste comprises the following components in parts by weight: 30 parts of pigment powder D, 12 parts of dodecyl dimethyl ammonium chloride, 1 part of dodecyl trimethyl ammonium chloride, 2 parts of tetradecyl trimethyl ammonium chloride, 0.15 part of Antimussol NS 22, 0.15 part of D-foam-RC732 and 54.7 parts of deionized water.
The preparation method of the cationic color paste comprises the following steps:
(1) Uniformly stirring a cationic dispersing agent, 95% deionized water and 50% defoamer in a high-speed 600r/min dispersing machine, then adding pigment powder and dispersing at a high speed for 1h, wherein the rotating speed of high-speed dispersion is 800r/min;
(2) Transferring the mixture prepared in the step (1) into a horizontal sand mill, and carrying out coarse grinding by adopting 0.6um zirconium beads as a grinding medium until the fineness scraper meter measures the particle size D95 of the color paste to be less than 5um, so as to obtain a color paste semi-finished product;
(3) Pumping the color paste semi-finished product into a bar pin type horizontal sand mill with 0.3mm zirconium beads as grinding media for fine grinding until the particle size D95 of the color paste measured by a particle size analyzer is less than 0.3um, and obtaining color paste;
(4) Pumping color paste into a material cylinder, adding the rest 5% deionized water and 50% defoamer at the speed of 600r/min of a high-speed dispersing machine, stirring until the viscosity fineness and the like are qualified, and filtering and packaging to obtain the water-based cation color paste.
Example 2
The aqueous cationic color paste comprises the following components in parts by weight: 30 parts of pigment powder D, 12 parts of tetradecyldimethyl ammonium chloride, 1 part of dodecyl trimethyl ammonium chloride, 2 parts of tetradecyl trimethyl ammonium chloride, 0.1 part of Antimussol NS 22, 0.15 part of D-foam-RC732 and 54.75 parts of deionized water.
The color paste of this example was prepared in the same manner as in example 1.
Example 3
The aqueous cationic color paste comprises the following components in parts by weight: 30 parts of pigment powder D, 5 parts of hexadecyldimethyl ammonium chloride, 5 parts of octadecyl dimethyl ammonium chloride, 2 parts of dodecyl trimethyl ammonium chloride, 1 part of tetradecyl trimethyl ammonium chloride, 0.1 part of Antimussol NS 22, 0.1 part of D-foam-RA101X and 54.8 parts of deionized water.
The color paste of this example was prepared in the same manner as in example 1.
Example 4
The aqueous cationic color paste comprises the following components in parts by weight: pigment powder C25 parts, cetyl dimethyl ammonium chloride 5 parts, stearyl dimethyl ammonium chloride 5 parts, antimussol NS 22.2 parts and deionized water 64.8 parts.
The preparation method of the aqueous cationic color paste comprises the following steps:
(1) Uniformly stirring a cationic dispersing agent, deionized water and 60% of defoaming agent in a high-speed dispersing machine at the speed of 800r/min, adding pigment powder, and dispersing at the high speed for 1.5h, wherein the rotating speed of high-speed dispersion is 1100r/min;
(2) Transferring the mixture prepared in the step (1) into a horizontal sand mill, and carrying out coarse grinding by adopting 0.8um zirconium beads as a grinding medium until the fineness scraper meter measures the particle size D95 of the color paste to be less than 5um, so as to obtain a color paste semi-finished product;
(3) Pumping the color paste semi-finished product to a high-pressure homogenizer for homogenization until the particle size D95 of the color paste measured by a particle size analyzer is less than 0.3um, and obtaining color paste;
(4) Pumping the color paste into a material cylinder, adding the rest deionized water and the defoamer at the stirring speed of a high-speed dispersing machine of 800r/min, stirring until the viscosity fineness and the like are qualified, and filtering and packaging to obtain the water-based cation color paste.
Example 5
The aqueous cationic color paste comprises the following components in parts by weight: 35 parts of pigment powder E, 5 parts of cetyl dimethyl ammonium chloride, 5 parts of octadecyl dimethyl ammonium chloride, 10 parts of dodecyl trimethyl ammonium chloride, 0.2 part of Antimussol NS 22, 0.2 part of D-foam-RA101X and 44.6 parts of deionized water.
The preparation method of the cationic color paste comprises the following steps:
(1) Uniformly stirring a cationic dispersing agent, deionized water and 40% of defoaming agent in a high-speed dispersing machine at the speed of 700r/min, adding pigment powder, and dispersing at the high speed for 1h, wherein the rotating speed of high-speed dispersion is 1000r/min;
(2) Transferring the mixture prepared in the step (1) into a horizontal sand mill, and carrying out coarse grinding by adopting 0.7um zirconium beads as a grinding medium until the fineness scraper meter measures the particle size D95 of the color paste to be less than 5um, so as to obtain a color paste semi-finished product;
(3) Pumping the color paste semi-finished product into a bar pin type horizontal sand mill with 0.3mm zirconium beads as grinding media for fine grinding until the particle size D95 of the color paste measured by a particle size analyzer is less than 0.3um, and obtaining color paste;
(4) Pumping the color paste into a material cylinder, adding the rest defoamer at the speed of a high-speed dispersing machine of 700r/min, stirring until the viscosity fineness and the like are qualified, and filtering and packaging to obtain the water-based cationic color paste.
Example 6
The aqueous cationic color paste comprises the following components in parts by weight: 32 parts of pigment powder F, 5 parts of cetyl dimethyl ammonium chloride, 10 parts of dodecyl trimethyl ammonium chloride, 0.2 part of Antimussol NS 22 and 50 parts of deionized water.
The preparation method of the cationic color paste comprises the following steps:
(1) Uniformly stirring a cationic dispersing agent, deionized water and 40% of defoaming agent in a high-speed 600r/min dispersing machine, adding pigment powder, and dispersing at a high speed for 1h, wherein the rotating speed of high-speed dispersion is 8000r/min;
(2) Transferring the mixture prepared in the step (1) into a horizontal sand mill, and carrying out coarse grinding by adopting 0.7um zirconium beads as a grinding medium until the fineness scraper meter measures the particle size D95 of the color paste to be less than 5um, so as to obtain a color paste semi-finished product;
(3) Pumping the color paste semi-finished product into a bar pin type horizontal sand mill with 0.3mm zirconium beads as grinding media for fine grinding until the particle size D95 of the color paste measured by a particle size analyzer is less than 0.3um, and obtaining color paste;
(4) Pumping the color paste into a material cylinder, adding the rest defoamer at the speed of a high-speed dispersing machine of 700r/min, stirring until the viscosity fineness and the like are qualified, and filtering and packaging to obtain the water-based cationic color paste.
Comparative example 1
The cationic color paste of the comparative example comprises the following components in parts by weight: 30 parts of pigment powder A, 12 parts of dodecyl dimethyl ammonium chloride, 1 part of dodecyl trimethyl ammonium chloride, 2 parts of tetradecyl trimethyl ammonium chloride, 0.15 part of Antimussol NS 22, 0.15 part of D-foam-RC732 and 54.7 parts of deionized water.
The color paste of this comparative example was prepared in the same manner as in example 1.
Comparative example 2
The cationic color paste of the comparative example comprises the following components in parts by weight: 30 parts of pigment powder B, 12 parts of dodecyl dimethyl ammonium chloride, 1 part of dodecyl trimethyl ammonium chloride, 2 parts of tetradecyl trimethyl ammonium chloride, 0.15 part of Antimussol NS 22, 0.15 part of D-foam-R C732 and 54.7 parts of deionized water.
The color paste of this comparative example was prepared in the same manner as in example 1.
Performance testing
The aqueous cationic color pastes prepared in examples 1 to 4 and comparative examples 1 and 2 were tested for storage stability, particle size D95 (um), viscosity (CP), comparative tinting strength (%) and pH according to national and enterprise-related test standards. In addition, in order to illustrate the compatibility of the cationic color paste, the compatibility of the cationic color paste in the varnish and the compatibility of the cationic color paste in the white paint are detected, wherein the method for testing the compatibility of the cationic color paste in the varnish is as follows: commercial cationic varnishes were taken, varnishes: the aqueous cation color paste is prepared according to the following steps of 9:1, carrying out contrast scratch coating on a standard detection glass plate by using a silk rod with the wet film thickness of 10um, and observing the uniform color condition and pigment agglomeration condition on the glass plate; the method for testing the compatibility in the cationic white paint comprises the following steps: taking commercially available cationic white paint, wherein the white paint is as follows: the color paste is prepared from the following components in percentage by weight: 1, and on a standard black-and-white color card, comparing and scraping with a silk rod with a wet film thickness of 80 mu m, immediately scraping again with a glass rod, and observing whether pigment particles, silk pigments and the like exist in a color card coating area. The following table is obtained through detection and observation:
TABLE 1 Performance test results Table
Note that: in the table, D95 represents the size of particles through which 95% of the color paste can pass.
It can be seen from the above table that the size of the conductivity of the clear liquid of the pigment powder directly affects the preparation and viscosity of the color paste product, and comparative example 1 uses the directly purchased pigment powder, and the conductivity of the clear liquid is higher, so that the pigment powder cannot be prepared in the dispersing process due to the higher viscosity, and secondly, by reducing the conductivity of the clear liquid of the pigment powder of comparative example 1, the aqueous cationic color paste of comparative example 2 still has higher viscosity, but the aqueous cationic color paste meets the requirements in other performance tests. According to the test results of examples 1-4, compared with comparative examples 1-2, the viscosity of the prepared color paste can be effectively reduced by simply reducing the conductivity of the pigment powder under the premise of not changing other conditions. In addition, the detection data of examples 1-4 show that the particle size D95 of the aqueous cationic color paste is smaller than 0.3, the color paste has good storage stability, the pigment powder is uniformly distributed, and the compatibility of the aqueous cationic color paste in cationic paint is good.
Claims (9)
1. The water-based cationic color paste is characterized by comprising 25-35 parts of pigment powder, 10-20 parts of cationic dispersing agent, 0.2-0.4 part of defoamer and 44.6-64.8 parts of deionized water, wherein the conductivity of clear pigment powder is less than 55 mu S/cm.
2. The aqueous cationic color paste according to claim 1, wherein the cationic dispersant comprises one or more of dodecyl dimethyl ammonium chloride, tetradecyl dimethyl ammonium chloride, hexadecyl dimethyl ammonium chloride, octadecyl dimethyl ammonium chloride, dodecyl trimethyl ammonium chloride and tetradecyl trimethyl ammonium chloride.
3. The aqueous cationic color paste according to claim 1, wherein the antifoaming agent is a mineral oil or/and silicone antifoaming agent.
4. A method for preparing the aqueous cationic color paste according to any one of claims 1 to 3, comprising the steps of:
(1) Uniformly stirring a cationic dispersing agent, deionized water and part of defoaming agent in a high-speed dispersing machine, and then adding pigment powder for high-speed dispersion;
(2) Transferring the mixture prepared in the step (1) into a horizontal sand mill for coarse grinding to obtain a color paste semi-finished product;
(3) Transferring the color paste semi-finished product into a bar pin type horizontal sand mill for fine grinding or into a high-pressure homogenizer for homogenization to obtain color paste;
(4) Adding the rest defoamer into the color paste in the dispersing process of the high-speed dispersing machine, stirring and filtering to obtain the water-based cation color paste.
5. The process according to claim 4, wherein the stirring speed in the step (1) or/and the step (4) is: 600r/min to 800r/min.
6. The method according to claim 4, wherein the conditions for high-speed dispersion in the step (1) are: the rotating speed is 800 r/min-1100 r/min.
7. The preparation method of claim 4, wherein 0.6-0.8 um zirconium beads are adopted as grinding media in the step (2), and the particle size D95 of the color paste semi-finished product is less than 5um.
8. The method according to claim 4, wherein 0.3mm zirconium beads are used as grinding media in the step (3), and the color paste has a particle size D95 of less than 0.3um.
9. The aqueous cationic color paste according to any one of claims 1 to 3 or the aqueous cationic color paste prepared by the preparation method according to any one of claims 4 to 8, applied in wood coloration, printing ink, textile or paper industry.
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