CN107987612B - Water-based Jing porcelain Single-pass high-speed ink-jet printing thermal transfer ink and preparation method thereof - Google Patents

Abstract

The invention provides a water-based high-speed ink-jet printing thermal transfer ink suitable for a Single-pass Beijing porcelain sprayer, which comprises the following raw materials: the nano color paste comprises the following raw materials: the salt-free refined superfine disperse dye comprises a salt-free refined superfine disperse dye toner, a dispersing agent, an emulsifier A, glycerol, a bactericide, a defoaming agent and deionized water; the water-based high-speed Beijing porcelain ink-jet thermal transfer ink is suitable for Single-pass high-speed ink-jet printing and printing of KJ4B-600DPI, and has the advantages of smooth printing, good standby performance, good quick-drying performance, stable printing performance and no wire drawing; the color stability and reducibility of the ink are good, the printing is convenient for plate-to-plate color matching, the printing quality is high, the consistency of finished products is good, the comprehensive cost is low, the dye ink is free from waste, resources are saved, and the physical and chemical properties of 4-5 levels of water washing, 4-5 levels of dry and wet wiping, 3.5-5 levels of sun resistance and the like are excellent; the ink is environment-friendly and non-toxic, the printing process does not need plate making, and no waste water or waste gas is generated, so that the printing ink is efficient and environment-friendly.

Description

Water-based Jing porcelain Single-pass high-speed ink-jet printing thermal transfer ink and preparation method thereof

Technical Field

The invention belongs to the technical field of ink-jet ink, and particularly relates to aqueous heat transfer ink suitable for a Single-pass Beijing porcelain sprayer and a preparation method thereof.

Background

The thermal transfer printing digital printing, also called digital transfer printing or digital ink-jet transfer printing, is to utilize digital technology to print various textiles containing chemical fiber, the processing process is simply to input the image into a computer by various digital means, form the required pattern after the editing processing by a printing software system, then control a digital printer by output software, spray print various special thermal transfer inks onto transfer paper, then transfer print onto the chemical fiber fabric through the fixation processing of 180 plus materials at 220 ℃, obtain the digital printed textiles printed with high precision and high water fastness.

The thermal transfer digital ink-jet printing technology gradually replaces the traditional textile printing technology globally by means of obvious green printing technology and unique printing mode. The heat transfer printing digital printing is not only used for living aspects such as clothes, bedding articles, curtains, carpets, outdoor sports equipment, bags, advertising banners and the like. With the development requirement of the domestic digital printing industrialization process, the low-speed printer and the medium-speed industrial machine are difficult to meet the requirements of a digital printing factory on printing output, printing speed and comprehensive cost reduction. According to the digital printing experience of Europe and America, the production of large and medium-scale digital printing factories adopts MS, Stork, Homer and other medium and high speed industrial ink jet printers for production, while numerous low speed EPSON head printers are mostly used by numerous domestic medium and small-scale digital printing factories, and the printing efficiency, the productivity and the quality are not ensured. At present, a part of large printing plants in China also use domestic medium and high speed paper printing machines or Single-pass high speed paper printing transfer printing machines represented by Hongmei, Honghua and hope. In order to meet the development requirement of the domestic digital printing industrialization process and the shortcut of curve overtaking in the aspects of domestic printing industry upgrading and high-end manufacturing, Single-pass high-speed ink-jet printing is adopted.

The Single-Pass printing technology in digital printing is different from the common printing mode that a spray head trolley moves and is used for printing by covering for one time to multiple times through the spray head until picture output is finished. The core component of the Single-Pass printing technology is a spray head, and the spray head of the high-speed ink-jet printing industrial machine is high in precision and speed, is produced by Jing porcelain company, is most successful in the application of water-based ink, and is verified in the digital printing industry. Single-Pass digital printing is a leader of the current digital printing, the printing speed can reach 35-100 m/min (2000-. 20 Single-Pass printing machines installed in China in 2017 are expected, wherein more than 60% of the Single-Pass printing machines are used for thermal transfer printing paper, compared with a medium-low speed printer and an industrial machine, the Single-Pass high-speed ink-jet printing machine has the advantages of high printing capacity and speed, uniform product batch and high quality, and the comprehensive printing cost is greatly reduced. The application of high-precision Single-pass high-speed inkjet printing schemes represented by Jing porcelain nozzles is outstanding, and the advantages are as follows: first, high-speed inkjet printing: the speed of the Beijing porcelain digital printing printer reaches 6000 m/h, which is more than 500 times of 200 + h of a common single-head Epson printer (12 square meters/h), and the Beijing porcelain digital printing printer can partially meet the requirement of the productivity efficiency of the traditional printing and dyeing; secondly, high precision: the physical precision of the Jing porcelain sprayer is 600DPI, the Jing porcelain sprayer can be printed and adapted to processing with various precisions, the minimum ink drop is 4PL, the Jing porcelain sprayer is an industrial grade sprayer which is closest to the precision of an EPSON sprayer at the portrait grade, and the pattern fineness and the transition fineness are difficult to achieve by the traditional printing and other industrial sprayers; thirdly, the matching use stability of the water-based heat transfer ink and the Beijing porcelain sprayer is good, the service life of the sprayer is prolonged, and the maintenance cost is reduced; fourthly, the cost of Single-pass high-speed ink-jet printing comprehensive printing is reduced, the cost is gradually close to that of the traditional printing and gradually recognized and accepted by the market; compared with the traditional printing, the thermal transfer printing has the advantages of less dye amount, higher efficiency, no waste water discharge, higher energy saving and higher efficiency; sixth, the printing mode is flexible and efficient, Single-pass digital printing does not need plate making, and the printing can be efficiently produced, so that the printing requirements of 100 plus 10000 and above code printing are met, a plurality of patterns of a plurality of customers can be typeset and printed at the same time, and the production efficiency and the machine utilization rate are greatly improved.

Today, the environmental protection is increasingly valued, and the traditional printing and dyeing industry is more and more stressed in upgrading. In Suzhou of 7 month in the year, thousands of water transfer machines are stopped due to the problem of sewage discharge, if the single equipment is completely upgraded to a medium-high speed digital printing machine and the number of GDP created by the added values of upstream and downstream products is calculated by billions, the number is huge in China and even the world.

Although the Single-pass high-speed ink-jet printing printer with the Beijing porcelain sprayer has great advantages, the problems of printing fluency, stability, standby performance, white line printing, printing color reduction, ink safety and the like exist in the matched ink at present due to the fact that the machine scheme starts late; as the KJ4B-600DPI of the spray head of the high-speed Single-pass porcelain and the KJ4B-300DPI of the high-speed Single-pass porcelain have different voltage, frequency, resolution, heating condition of the spray head, different printing modes, speeds, spraying force and the like, the index requirements of the ink are different, and the high requirements of 2000-plus 6000 m/h high-speed printing are high, so that the ink formula is redesigned and improved according to the design requirements of the spray head and a machine. No mature nano aqueous thermal transfer printing ink-jet ink suitable for Single-Pass of a Jing porcelain spray head exists in the market.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide the water-based high-speed ink-jet printing thermal transfer ink suitable for the KJ4B-600DPI Beijing porcelain sprayer and the preparation method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides water-based high-speed ink-jet printing thermal transfer ink which comprises the following raw materials in percentage by weight:

preferably, the nanometer water-based color paste comprises the following raw materials in percentage by weight:

preferably, the wetting agent is at least one of an acetylenic diol ethoxy surfactant and a polyether modified polysiloxane surfactant.

Further preferably, the acetylenic diol ethoxy surfactant is selected from at least one of Surfynol 104E, Surfynol440, Surfynol465, Surfynol485, Tianjin Cypress 520, Tianjin Cypress 508, Tianjin Cypress DS960, Dynol 604 and Dynol 607.

Further preferably, the polyether modified polysiloxane based surfactant is selected from at least one of TEGO 410, TEGO440, TEGO450, TEGO100, TEGO245, TEGO270, Dynol 960, Dynol 980, BYK346, BYK348 and EFKA 3580.

Preferably, the emulsifier A and the emulsifier B are at least one of polyoxyethylene ether wetting agent and macromolecular dispersion wetting agent.

Further preferably, the emulsifier A and the emulsifier B are respectively selected from at least one of Disponil A1580, A1080, Youka 690W, OP-15 and A233S. According to the invention, the emulsifier A and the emulsifier B are selected to play a role in emulsifying and wetting, the grinding efficiency of the color paste and the stability of the color paste are improved, and the stability of the emulsifier is considered to be added to different stages of color paste ink preparation respectively according to the types and the amounts of the emulsifier, so that the problems of wire drawing, inclined spraying, standby and the like in the printing process are solved stably and improved.

Preferably, the propylene glycol is 1, 3-propanediol; the pentanediol is at least one of 1, 5-pentanediol, 1, 2-pentanediol and 1, 3-pentanediol.

Preferably, the osmotic quick-drying agent is at least one of alcohol ethers such as ethylene glycol monobutyl ether and diethylene glycol butyl ether.

Preferably, the biocide is selected from at least one of ROCIMA520S, PROXEL GXL, Rohm and Haas LEX, TROYSAN186 from TROY.

Preferably, the disperse dye toner is an ultra-fine disperse dye powder which is refined and ground by purification, and does not contain salt, and the disperse dye toner is selected from at least one of B359, B72, B60, B360, R60, R146, Y54 and Br 027. Further preferably, the disperse dye blue is selected from one of B359, B72, B60 and B360, preferably B359.

Further preferably, the disperse dye red is selected from one of R60 and R146.

Further preferably, the disperse dye yellow is Y54.

Further preferably, the disperse dye black is 15% -50% by weight of B360, Br027 and Y54 respectively: 30% -70%: 5% -15% of the above-mentioned materials.

Further preferably, the dispersant is lignin with low sulfonation degree, good thermal stability, suitability for dispersion grinding and molecular weight of 10000 to 30000, such as REAX-85A, 907, HYACT and the like of imported Maidword Virware.

Further preferably, the auxiliary high dispersant is Lubrizol 46000, 44000 as a high molecular dispersant, or a nonionic comb dispersant for improving stability, such as hensmyl JEFF SPERSE X3503, a wetting dispersant DEGO740W, 750W, and the like, using one or more combinations thereof.

Preferably, the defoaming agent is at least one of a modified siloxane defoaming agent and an acetylene glycol defoaming agent.

Further preferably, the modified siloxane antifoaming agent is at least one selected from TEGO ANTIFOAM 2290, BYK019, BYK094 and Airase 5100.

Further preferably, the antifoaming agent is the acetylene glycol antifoaming agent with better stability, and is at least one selected from Surfynol MD20 and Surfynol 104.

Preferably, the ink further comprises one or more of a pH regulator and a chelating agent.

Further preferably, the pH adjusting agent is selected from at least one of the group consisting of the dow AMP-95, triethanolamine, diethanolamine and Tris base.

Further preferably, the chelating agent is selected from at least one of EDTA and EDTA-2N.

The invention also provides a method for preparing the aqueous high-speed ink-jet printing thermal transfer ink, which comprises the following steps:

(1) preparing nano color paste: putting the refined superfine disperse dye, the dispersant, the auxiliary dispersant, the emulsifier A, the glycerol, the defoamer, the bactericide and the deionized water into a dispersion barrel with a total of 300KG, dispersing for 2-3h at 1200 plus 1300rpm by a high-speed dispersion machine, and filtering by a filter bag with 80 meshes to remove a small amount of incompletely dispersed or large particle toner impurities; pumping the filtered color paste dispersion liquid into a grinding machine for dispersion grinding, wherein the rotating speed of the grinding machine is 800-820rpm, the grinding time is controlled to be 60-80h, the flow of a discharge port is 10-15kg/min, the temperature of the discharge port is controlled to be 35-45 ℃, and the nano-scale disperse dye color paste with the particle size of 100nm or more and D50 or more and 130nm or less and 250nm or more and D99 or more and 280nm or less is obtained; wherein the grinding machine is a German imported speed-resistant and Miller-resistant or domestic Tuopa 25L horizontal nano sand mill, a cylinder body and a tip of the grinding machine are made of wear-resistant steel structures or silicon carbide, and grinding balls are French imported zirconium beads with the diameter of 0.15mm-0.25 mm;

(2) preparing ink: starting a stirrer, adding water, adding propylene glycol, glycerol, pentanediol, a wetting agent, a penetration quick drying agent, an emulsifier B and a bactericide while stirring at the speed of 400 plus 600rpm, uniformly stirring, preferably stirring for 20-30min, adding the nanoscale dispersion color paste obtained in the step (1), and continuously stirring and uniformly mixing at the speed of 600 plus 800rpm, preferably stirring for 30-60 min;

(3) aging and filtering: after the feeding is finished, testing the viscosity and the surface tension, wherein the qualified range of the viscosity is 4.5-7.5mpa.s, preferably 5-6.5mpa.s, and the qualified range of the surface tension is 25-45mN/cm, preferably 30-40mN/cm, aging is carried out for 24-48h at 15-35 ℃ after the qualified viscosity and the qualified surface tension are qualified, so that the components in the ink are completely dissolved, a dispersion system is balanced, and insoluble substances and unstable colloids are separated out; after aging is finished, a 1um PP melt-blown filter element and a 0.2um PP folded filter element are used for positive pressure filtration to remove large particles and resin precipitates for the first time, a 0.5um glass fiber filter element is used for removing colloids and a 0.8um polyethylene sulfone folded filter element (absolute precision filter element) is used for positive pressure filtration to remove smaller precipitates and flocculent masses for the second time, and finally, a 0.2um PP filter membrane is used for negative pressure filtration and PALL bubble removal bags are used for bubble removal to obtain a final product.

The invention has the advantages of

1. The water-based high-speed (2000-6000 m/h) Jing porcelain ink-jet thermal transfer ink is suitable for Single-pass high-speed ink-jet printing of KJ4B-600DPI, is smooth in high-speed ink-jet printing, good in standby performance, stable in printing performance, good in quick-drying performance, free of wire drawing and inclined spraying, capable of realizing production of 1000-plus-5000 m large-roll thermal transfer paper, improving production efficiency and reducing printing comprehensive cost;

2. the aqueous high-speed ink-jet printing heat transfer ink suitable for the Beijing porcelain sprayer is good in stability and color reducibility, has physicochemical properties of 4-5 levels of washing, 4-5 levels of dry and wet wiping, 3.5-5 levels of sun resistance and the like, meets the requirement of digital printing, is good in color consistency of batches before and after printing, solves the problem of printing color-to-color plate alignment, and improves the quality stability of printed products;

3. the aqueous high-speed ink-jet printing thermal transfer printing ink suitable for the Jing porcelain sprayer is refined from the selected disperse dye toner, has no salt, no impurities and high purity, and the transfer printing has bright color, and the high purity is favorable for dispersing and grinding color paste, so that the stability of the ink is improved; the corrosion of inorganic salt to the spray head is reduced, and the spray head cannot be corroded and blocked after long-term use, so that the service life of the spray head is prolonged;

4. the aqueous high-speed ink-jet printing thermal transfer ink suitable for the Jing porcelain sprayer is environment-friendly and non-toxic, is free from plate making, waste water and waste gas generation in the printing process through REACH and green leaf certification, is efficient and environment-friendly, and is a preferable environment-friendly alternative scheme for traditional printing and dyeing;

5. the aqueous high-speed ink-jet printing thermal transfer ink suitable for the Jing porcelain sprayer has good compatibility with the Jing porcelain sprayer, and can be widely used for digital transfer printing of a Jing porcelain sprayer Single-pass industrial printer.

Detailed Description

The invention will now be described in more detail with reference to the following examples, which are not intended to limit the invention thereto.

Examples 1 to 4 and comparative examples 1 to 4

Example 1

Preparing raw materials of color paste: weighing R6020%, dispersant HYACT 8.5%, Lubrizol 44001.5%, emulsifier A233S 3%, 690W 1.5%, glycerin 20%, Surfynol 1040.05%, PROXEL GXL 0.2%, and deionized water in balance.

The preparation method of the nano color paste comprises the following steps: preparing R60, HYACT, Lubrizol 4400, A233S, 690W, glycerol, Surfynol 104, PROXEL GXL and deionized water in proportion to total 300KG, sequentially putting the materials into a dispersing barrel at 1200rpm for dispersing for 2h, filtering the materials by a filter bag of 80 meshes, transferring the filtered materials into a grinding machine for dispersing and grinding, controlling the rotation speed of the grinding machine at 820rpm, the grinding time at about 70h, controlling the flow of a discharge port at 12-15KG/min, controlling the temperature of the discharge port at 40 +/-5 ℃, and obtaining the nano-scale color paste with the particle size of D50 being not more than 100nm and not more than 130nm and D99 being not more than 250nm and not more than 280 nm; the grinding machine is a German imported relaxation-resistant 25L horizontal nano sand grinding machine, a cylinder body and a tip of the grinding machine are of wear-resistant steel structures, and grinding balls are French imported zirconium beads with the diameter of 0.15-0.25 mm.

Testing color paste stability

Centrifuging the obtained nanoscale color paste at 10000rpm, filtering the nanoscale color paste by using a 1um PP melt-blown filter core of an inlet PALL, then taking a 1KG sample, carrying out a 60 ℃ aging stability (color paste thermal stability) test, wherein the time is 2-4 weeks, testing the absorption spectra of an upper layer and a lower layer by using an Shimadzu UV1800 ultraviolet visible spectrophotometer after the color paste is aged, controlling the difference value of the upper layer and the lower layer within 3% -5%, so that the thermal stability of the color paste is ideal, then continuously filtering the aged color paste by using a 150 mm-diameter PP filter membrane with the diameter of 0.2um of Hangzhou Kebaite, wherein the color paste can be filtered for more than 10KG at one time and has no impurities, and in addition, the particle size after the aging test is preferably within 5-10nm by using the Shimadzu SALD-2300 test color paste and the ink particle sizes D50 and D99 before and after aging.

The nanoscale dispersion color pastes of examples 2-4 and comparative examples 1-4 were prepared by the same preparation method and different formulations as in example 1, and the specific formulations are shown in Table 1.

TABLE 1 formulation of nano-sized dispersion color paste of examples 1-4 and comparative examples 1-4 and performance test results thereof

Examples 5 to 8 and comparative examples 5 to 8

Example 5

Preparing raw materials of an aqueous Single-pass high-speed ink-jet printing thermal transfer ink: 32 percent of color paste in example 1, 8 percent of Propylene Glycol (PG), 20 percent of Glycerol (GE), 10 percent of 1, 5-pentanediol, 3 percent of ethylene glycol monobutyl ether, BYK 3460.8 percent, 6070.1 percent, B-15801.2 percent of emulsifier, 0.1 percent of Proxel GXL and the balance of deionized water are weighed according to the weight ratio.

The preparation method of the nano ink comprises the following steps:

(1) starting a stirrer, adding deionized water, sequentially adding propylene glycol, glycerol, 1, 5-pentanediol, ethylene glycol monobutyl ether, BYK346 and 607, an emulsifier B-1580 and Proxel GXL while stirring at the speed of 400-600rpm, stirring for 20-30min until the materials are uniformly mixed, adding the nanoscale dispersion color paste, and continuously stirring for 30-60min at the speed of 600 rpm;

(2) testing the viscosity and the surface tension of the mixture uniformly mixed in the step (1), wherein the viscosity range is 5-6.5mpa.s, the surface tension range is 30-40mN/cm, the viscosity and the surface tension are all qualified, and then aging the mixture at 35 ℃ for 48 hours to ensure that the components in the ink are completely dissolved, the dispersion system is balanced, and insoluble substances and unstable colloids are separated out; after aging, carrying out positive pressure filtration by using a 1um melt-blown PP filter element and a 0.2um PP folding filter element for the first time to remove large particles and resin precipitates, then carrying out positive pressure filtration by using a 0.5um glass fiber filter element to remove colloids and a 0.8um polyethylene sulfone folding filter element (absolute precision filter element) for the second time to remove smaller precipitates and flocculent masses, and finally carrying out negative pressure filtration by using a 0.2um PP filter membrane and carrying out bubble removal by using a PALL bubble removal bag to obtain a final product.

Inks of examples 6 to 8 and comparative examples 5 to 12 were prepared in the same manner and with different formulations as in example 5, and the specific formulations are shown in tables 2 and 3.

Testing the performance of the filtered ink on a KJ4B-600DPI sprayer of Jing porcelain by using a special waveform file and a test picture, wherein the continuous printing time is not less than 2h, and the test strips are free from the conditions of disconnection, oblique spraying, white lines and the like before and after printing; after the test is finished, closing the scattered spraying standby for 30 minutes, and printing the test again, wherein the test strip is intact; and finally, after the printer is subjected to moisturizing treatment, the power supply is turned off, the printer is started up after 72 hours under the condition that the negative pressure of the ink box is kept and ink is not dripped, the phenomenon of hole blocking and inclined spraying is avoided when the nozzle is cleaned, and the ink performance is excellent. The results of the performance test of the inks of examples 5 to 8 and comparative examples 5 to 12 are shown in tables 2, 3 and 4.

The following comparative tests show that:

1. the combination of the dispersing agent and the emulsifying agent in the color paste formula can obviously influence the aging stability of the color paste and the ink, and the color paste and the ink are shown in the attenuation and the filtering performance deterioration and the particle size increase after the spectrum aging experiment; the proportion of the color paste and the emulsifier in the ink also influences the printing performance, standby, wire drawing and the like of the ink.

2. The penetrating quick-drying agent can effectively change the penetrating and quick-drying performance of the ink on paper, the ink can be printed at a high speed of 35-75 meters per second, and the ink can be normally produced only by meeting the conditions of quick drying, standby, smoothness, long-term production stability, no wire drawing white line and the like. The quick drying speed affects the production speed and quality slowly, the stand-by, the smoothness and the wire drawing white line affect the printing quality and efficiency due to the long-term production stability. The lack of any one property of the ink can affect the normal production and is not a qualified ink product. The requirements of the performances are far higher than those of other similar medium-low speed digital printing inks, so that the difficulty of producing an ink product which is qualified in all aspects of indexes can be known.

TABLE 2 ink formulations of examples 5-8 and their performance test results

TABLE 3 ink formulations for comparative examples 5-8 and performance test results thereof

TABLE 4 ink formulations for comparative examples 9-12 and performance test results thereof

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and the present invention is not limited to the embodiments, and various changes and modifications may be made without departing from the spirit and scope of the present invention, and these changes and modifications fall within the scope of the claimed invention.

Claims (7)

1. The water-based Jing porcelain Single-pass high-speed ink-jet printing thermal transfer ink is characterized by comprising the following raw materials in percentage by weight:

the nanometer water-based color paste comprises the following raw materials in percentage by weight:

the disperse dye toner is selected from at least one of B359, B72, B60, B360, R60, R146, Y54 and Br 027; the dispersant is lignin with molecular weight of 10000-30000.

2. The aqueous Jing porcelain Single-pass high-speed inkjet printing thermal transfer ink according to claim 1, wherein the ink further comprises one or more of a pH regulator and a chelating agent.

3. The aqueous Jing porcelain Single-pass high-speed inkjet printing thermal transfer ink according to claim 1, wherein the wetting agent is at least one of alkynediol ethoxy surfactant, polyether modified polysiloxane surfactant and fluorocarbon surfactant.

4. The aqueous Jing porcelain Single-pass high-speed inkjet printing thermal transfer ink according to claim 1, wherein the emulsifier B is at least one of a nonionic wetting agent, a polyoxyethylene ether wetting agent or a high molecular block dispersing wetting agent.

5. The aqueous Jing porcelain Single-pass high-speed inkjet printing thermal transfer ink according to claim 1, wherein the propylene glycol is 1, 3-propylene glycol; the pentanediol is at least one of 1, 5-pentanediol, 1, 2-pentanediol and 1, 3-pentanediol.

6. The aqueous Jing porcelain Single-pass high-speed inkjet printing thermal transfer ink according to claim 1, wherein the penetrating fast-drying agent is at least one selected from the group consisting of ethylene glycol monobutyl ether and diethylene glycol monobutyl ether.

7. A method for preparing the aqueous Beijing ceramic Single-pass high-speed inkjet printing thermal transfer ink according to any one of claims 1 to 6, comprising the following steps:

(1) dispersing and grinding the refined superfine disperse dye toner, a dispersing agent, an auxiliary dispersing agent, an emulsifying agent A, glycerol, a defoaming agent, a bactericide and deionized water to prepare nano water-based color paste;

(2) starting the stirrer, adding water, adding propylene glycol, glycerol, pentanediol, a wetting agent, a penetration fast drying agent, an emulsifier B and a bactericide while stirring, adding the nano aqueous color paste obtained in the step (1) after uniformly stirring, and continuously stirring and uniformly mixing;

(3) and (3) aging, filtering and defoaming the mixture mixed in the step (2) to obtain the final product.