A kind of suspendable micro powder wax and its paint based on double electric layer compression theory preparation

Abstract

This invention discloses a suspendable micronized wax and its coating prepared based on the double-layer compression theory. First, a composite modified double-layer compression agent micronized powder T is obtained by composite modification and pH control of an inorganic double-layer compression agent. Then, a modified micronized wax is obtained by negatively charging the surface of the micronized wax. The two are then blended to obtain a suspendable modified micronized wax. After solvation pretreatment, it is added to a coating system to prepare a special coating that achieves a suspension effect. Furthermore, the suspended wax in this special coating can be redispersed after slight vibration, perfectly solving the floating / sinking phenomenon of wax powder components due to insufficient suspension stability under long-term static conditions in the coating production line's storage tank. This improves the stability of the roller coating process and the appearance quality of the coating film, and has significant industrial application value.

Description

Technical Field

[0001] This invention relates to the field of micronized wax preparation, and more particularly to a suspendable micronized wax and its coating prepared based on the double-layer compression theory. Background Technology

[0002] Micronized waxes are used in coatings as an "industrial MSG," significantly improving the feel, smoothness, scratch resistance, and abrasion resistance of coatings, thus enjoying widespread application in the coatings industry. However, due to the potential density difference between micronized waxes and coating systems, coating systems with added micronized waxes often exhibit phenomena such as the floating of low-density micronized waxes (e.g., polyethylene wax, polypropylene wax) and the settling of high-density micronized waxes (e.g., polytetrafluoroethylene wax) during actual application and storage. These floating and settling wax phenomena are common storage instability issues associated with micronized waxes in practical coating applications.

[0003] Especially during large-scale continuous roller coating production lines, a large amount of paint is stored in the paint tank to support the continuous production of the coating line. Most large-scale continuous roller coating production lines on the market currently have built-in sinking small agitators and dispersers to prevent the settling of wax powder or other pigments and fillers. However, because the pick-up roller needs to pick up the paint from the surface of the paint tank during continuous production, the relatively calm state of the liquid surface in the paint tank needs to be maintained. Therefore, the stirring power of the disperser cannot be too high. This results in the paint in the paint tank not being completely uniform. In particular, paint containing low-density, easily floating wax powder will accelerate the formation of "floating wax" phenomenon in the paint tank with relatively weak stirring. The paint containing excessive "floating wax" floating on the surface is the first to be picked up by the pick-up roller and rolled onto the substrate. This inevitably leads to uneven distribution of wax powder in the paint film during the coating process, resulting in paint film defects such as "prickly heat," "orange peel," and "pinholes."

[0004] Therefore, there is an urgent need for a technical solution that can improve or avoid the floating or settling of micronized wax during paint storage, which leads to problems such as the material taking roller picking up material from the paint tank, uneven material taking during roller coating, and consequently, poor paint film surface. Summary of the Invention

[0005] A suspendable micronized wax based on the theory of electric double layer compression is prepared by blending a composite modified electric double layer compressive agent micronized powder T with a negatively charged modified micronized wax, comprising:

[0006] Preparation of S1 Composite Modified Double Layer Compressor: S11 Prepare organic nonionic double layer compressor aqueous solution masterbatch M; S12 Prepare weakly acidic inorganic double layer compressor aqueous solution A using masterbatch M; S13 Prepare weakly alkaline inorganic double layer compressor aqueous solution B using masterbatch M; S14 Mix A and B in proportion to prepare composite modified double layer compressor aqueous solution C; S15 Dry composite modified double layer compressor aqueous solution C to obtain composite modified double layer compressor micro powder T, wherein the Zeta potential of the deionized aqueous solution of composite modified double layer compressor micro powder T with a mass concentration of 1% is between -20 and -80 mV;

[0007] S2 negative charge modified micro powder wax preparation: prepared by mixing highly negative charge montmorillonite and / or silica micro powder with micro powder wax, and / or prepared by mixing high acid value polar wax with weak polar and / or non-polar wax in a certain proportion, melting and stirring evenly and spraying out.

[0008] S3 suspendable micro powder wax: prepared by mixing micro powder T, a composite modified double-layer compressor in S1, with negatively charged modified micro powder wax in S2.

[0009] Among them, the surface negative charge modification of S2 wax includes Method 1, composite blending method and Method 2, polymer alloy method;

[0010] Method 1, the composite blending method, is prepared by mixing highly negatively charged montmorillonite and / or silica micropowder with micro powder wax;

[0011] Method 2, the polymer alloy method, involves mixing high-acid-value polar wax with weakly polar and / or non-polar wax in a certain proportion, melting and stirring until uniform, and then spraying the mixture.

[0012] Furthermore, the method for preparing the suspendable micro powder wax by solvation involves slowly adding the suspendable micro powder wax to a mixed solvent of ethylene glycol butyl ether (BCS), propylene glycol methyl ether (PM), dipropylene glycol butyl ether (DPNB), ethanol (EtOH), and dipropylene glycol methyl ether (DPM), heating the mixture under stirring for a period of time, cooling it to room temperature, and then centrifuging to obtain a well-solvated suspendable micro powder wax.

[0013] In one embodiment, the solute in the aqueous solution M in S11 includes one or more of polyvinylpyrrolidone (PVP), sodium dodecylbenzene sulfonate (SDBS), sodium dodecyl sulfonate (SDS), and polyethylene glycol (PEO).

[0014] The solutes in the weakly acidic inorganic double-layer compressor aqueous solution A in S12 include one or a combination of several of the following: ferric chloride FeCl3, calcium dihydrogen phosphate Ca(H2PO4)2, aluminum dihydrogen phosphate Al(H2PO4)3, magnesium dihydrogen phosphate Mg(H2PO4)2, sodium dihydrogen citrate KH2C6H5O7, sodium bisulfite NaHSO3, sodium bisulfate NaHSO4, sodium maleate NaHC4H2O4, and potassium hydrogen phthalate KHC8H4O4.

[0015] The solute in the weakly basic inorganic double-layer compressor aqueous solution B of S13 includes one or a combination of several of the following: calcium oxide (CaO), calcium hydroxide (Ca(OH)2), sodium hydroxide (NaOH), sodium carbonate (Na2CO3), sodium bicarbonate (NaHCO3), potassium hydroxide (KOH), potassium carbonate (K2CO3), and potassium bicarbonate (KHCO3).

[0016] Preferably, the mass concentration of masterbatch M in S11 is 1‰ to 3%.

[0017] Preferably, the mass ratio of the organic nonionic double-layer compressive agent in S11 is PVP:SDBS:SDS:PEO = (0-55):(0-30):(0-25):(0-66), and more preferably PVP:SDBS:SDS:PEO = (0-38):(0-15):(0-21):(0-49).

[0018] Preferably, the mass ratio of the double-layer compressor in S12 is FeCl3:Ca(H2PO4)2:Al(H2PO4)3:Mg(H2PO4)2:KH2C6H5O7:NaHSO3:NaHSO4:NaHC4H2O4:KHC8H4O4 = (0-32):(0-40):(0-15):(0-9):(0-60):(0-43):(0-12):(0-45):(0-36), and more preferably (0-12):(0-8):(0-6):(0-5):(0-40):(0-34):(0-7):(0-38):(0-29).

[0019] Preferably, the mass ratio of the double-layer compressor in S13 is CaO:Ca(OH)2:NaOH:Na2CO3:NaHCO3:KOH:K2CO3:KHCO3 = (0-26):(0-18):(0-23):(0-51):(0-46):(0-13):(0-32):(0-65), and more preferably (0-10):(0-8):(0-6):(0-40):(0-34):(0-7):(0-28):(0-29).

[0020] In one embodiment, when pH=7 in S2, the zeta potential of the montmorillonite micro powder is -25 to -35 mV and the D50 is 2.02-6.1 μm; when pH=7, the zeta potential of the silica micro powder is -10 to -50 mV and the D50 is 2.35-5.91 μm.

[0021] In one embodiment, the mixing ratio of montmorillonite powder and silica powder is (0-85):(0-70).

[0022] In one embodiment, the surfaces of the montmorillonite powder and silica powder contain silanol and aluminumol groups.

[0023] In one embodiment, the surface of the high-acid-value polar wax in S2 is grafted with carboxyl groups and / or hydroxyl groups, and the alloy modification mass ratio of the high-acid-value polar wax to the weakly polar and / or non-polar wax is (10-45):(55-90).

[0024] In Method 1, highly negatively charged montmorillonite and / or silica micropowders are blended with micropowder wax to obtain micropowder wax with negatively charged surface.

[0025] The micronized wax and the above-mentioned highly negatively charged modified inorganic material are mixed evenly by a blending method, so that the highly negatively charged modified inorganic material is fully adsorbed on the surface of the micronized wax, resulting in negatively charged modified micronized wax.

[0026] In Method 1, the negatively charged modified micronized wax is prepared by using one or more of the following materials in any proportion: PTFE, polyethylene wax, Fischer-Tropsch wax, polypropylene wax, modified polyethylene wax, oxidized polyethylene wax, oxidized Fischer-Tropsch wax, oxidized polypropylene wax, maleic anhydride-grafted polyethylene wax, maleic anhydride-grafted Fischer-Tropsch wax, maleic anhydride-grafted polypropylene wax, carnauba wax, candelilla wax, rice bran wax, sugarcane wax, and sunflower wax.

[0027] Method 1 uses a powder mixing device, which is one of a V-type mixer, a three-dimensional mixer, or a cone mixer. The mixing motor speed is 15-50 rpm, and the mixing time is 20-40 min.

[0028] In one embodiment, the mass ratio of the micronized wax to the highly electronegative modified inorganic material is (80-99.9):(0.1-20).

[0029] Method 2: High-acid-value polar wax and weakly polar or non-polar wax are added to a melting tank at a mass ratio of (10-45):(55-90). After being thoroughly stirred, the mixture is pumped to a nozzle and sprayed out to obtain micro powder wax with surface negative charge modification.

[0030] Method 2 includes one or more of the following high-acid-value polar waxes, in any proportion: oxidized polyethylene wax, oxidized Fischer-Tropsch wax, oxidized polypropylene wax, maleic anhydride-grafted polyethylene wax, maleic anhydride-grafted Fischer-Tropsch wax, maleic anhydride-grafted polypropylene wax, carnauba wax, candelilla wax, rice bran wax, sugarcane wax, sunflower wax, etc.

[0031] Weakly polar or non-polar waxes include one or more of polyethylene wax, Fischer-Tropsch wax, polypropylene wax, polytetrafluoroethylene wax, etc., in any proportion combination.

[0032] Preferably, the negatively charged modified micronized wax is obtained by spray granulation. The heating temperature of the suspended melt formed by spraying high-acid-value polar wax and weakly polar or non-polar wax is 80-270℃, preferably 180-220℃. After the high-acid-value polar wax and weakly polar or non-polar wax are completely melted, the mixture is continuously stirred for 5 min to 0.5 h until the two waxes are fully homogenized. Then, it is pumped to the nozzle and sprayed out. The nozzle diameter is 0.5 mm to 4.5 mm, the spray flow rate is 5-50 L / h, and the resulting negatively charged modified micronized wax has a D50 of 3.04-5.15 μm, a D90 of 5.25-9.62 μm, and a dispersion shear velocity of the two wax melts of 3-15 m / s, preferably 6-10 m / s.

[0033] In one embodiment, in S14, A and B are prepared in a volume ratio of (45-65):(35-55) to prepare an aqueous solution C of a composite modified double-layer compressive agent.

[0034] The preparation of S14 weakly alkaline composite double layer compressive agent aqueous solution C involves mixing weakly acidic inorganic double layer compressive agent aqueous solution A and weakly alkaline inorganic double layer compressive agent aqueous solution B in a volume ratio of (45-65):(35-55) and stirring until homogeneous to obtain composite double layer compressive agent aqueous solution C with pH = 7.1-8.8.

[0035] In the preparation of aqueous solutions A and B, an organic nonionic double-layer compressor aqueous solution M is used as a masterbatch, which helps to improve the composite stability of the weakly acidic inorganic double-layer compressor and the weakly alkaline inorganic double-layer compressor in S14, and ensures the uniform distribution of the two components in the composite modified double-layer compressor powder T in S15.

[0036] Furthermore, the pH of aqueous solutions A, B, and C does not require external acid / base adjustment; pH can be controlled through self-ionization / self-hydrolysis. At the same time, the weak alkalinity of the composite double-layer compressor is beneficial to promoting the control of the electric layer stability of the micronized wax surface by the double-layer compressor.

[0037] In one embodiment, S15, the aqueous solution C of the composite modified double-layer compressor is pumped to the nozzle of the spray drying tower for spray drying to obtain composite modified double-layer compressor powder T.

[0038] The nozzle diameter of the spray is 1.5mm-7.5mm, the spray flow rate is 10-500L / h, and the temperature inside the spray drying tower is 60-110℃, more preferably 75-95℃.

[0039] Preferably, the composite modified double-layer compressive agent micro powder T has a D50 of 3.01–6.26 μm and a D90 of 5.82–13.65 μm.

[0040] In one embodiment, the mass ratio of the composite modified double-layer compressor powder T to the negatively charged powdered wax in S3 is (0.5-15):(85-99.5).

[0041] The S3 mixing equipment is a type of V-type mixer, three-dimensional mixer, or conical mixer. The mixing motor speed is 15-50 rpm, and the mixing time is 20-40 min.

[0042] In one embodiment, the pH of the 1% mass concentration of the suspendable micronized wax in deionized water is 7.8-8.6, and the absolute value of the Zeta potential is -30 to -50 mV.

[0043] In one embodiment, the process further includes S4 solubilization of the suspendable micronized wax, wherein the suspendable micronized wax is placed in a polar solvent, the polar solvent including one or more of ethylene glycol butyl ether (BCS), propylene glycol methyl ether (PM), dipropylene glycol butyl ether (DPNB), ethanol (EtOH), and dipropylene glycol methyl ether (DPM).

[0044] In one embodiment, the mass ratio of the mixed solvent of ethylene glycol butyl ether (BCS), propylene glycol methyl ether (PM), dipropylene glycol butyl ether (DPNB) and dipropylene glycol methyl ether (DPM) in S4 is BCS:PM:DPNB:DPM = (16.1-58.4):(25.2-45.4):(5.6-24.3):(0.1-9.9), and more preferably (16.1-54.9):(25.4-37.5):(5.7-22):(0.2-4.1).

[0045] In one embodiment, the mass ratio of the mixed solvent to the suspendable micronized wax in S4 is (36-88):(12-64), and more preferably (48-72):(28-52).

[0046] The solvation of S4 suspended micronized wax involves rapidly dispersing the suspended micronized wax obtained in S3 into a mixed solvent of S4 at a linear velocity of 1-15 m / s. After stirring, the temperature is increased to 38-91℃ while stirring. Once the temperature is maintained, the linear velocity is reduced to 0.19-2.5 m / s and stirring continues for 15-75 min. The increased temperature during this process helps to improve the expansion of polar groups such as hydroxyl and carboxyl groups on the surface of the negatively charged modified wax and / or the silanol groups on the surface of highly negatively charged inorganic materials. The decreased stirring velocity helps to improve the compatibility between the negatively charged modified micronized wax and the composite modified double-layer compressor, allowing the suspended micronized wax to form a relatively stable whole at the microscopic level. The solid-liquid mixture is then separated by centrifugation to obtain a well-solventized, structurally stable, wet suspended micronized wax.

[0047] This application also discloses a coating comprising a suspendable micronized wax prepared based on the double-layer compression theory.

[0048] Preparation and application of S5 special coatings: The suspended micro powder wax that has been pretreated by solvent in S4 is dispersed into the coating system to obtain a special coating that can achieve the suspension effect of micro powder wax;

[0049] S6 Micronized Wax Suspension Effect Verification: The special coating was placed in an oven for heat storage to accelerate the simulation of the stability of the micronized wax in the paint tank and confirm the suspension effect of the micronized wax.

[0050] S7 Oscillation Redispersibility Verification: Apply a slight shaking force to the special coating after heat storage to verify whether the suspendable micro powder wax can be redispersed in the coating;

[0051] The varnish is a water-based or solvent-based coating system, which includes a main resin, curing agent, neutralizer, solvent, film-forming aid, deionized water, defoamer, wetting and leveling agent, etc., with a mass ratio of (30-50): (7-14): (1-4): (1-14): (10-25): (1-8): (0.2-0.6): (0.2-0.6).

[0052] In one embodiment, a heat storage verification experiment was conducted on the suspendable special coating. The method is characterized by sealing the coating containing suspendable micro-powder wax in a transparent plastic bottle and then placing it in an oven for heat storage, observing the state of the micro-powder wax in the coating, and verifying the suspension effect of the suspendable micro-powder wax in the coating.

[0053] Preferably, the temperature of the heat storage oven is 25-70℃ and the heat storage time is 1-90 days, more preferably 35-60℃ and 7-30 days.

[0054] In one embodiment, a vibration redispersion verification test is conducted on the special coating after heat storage. The characteristic is that the above-mentioned suspendable special coating is placed on a vibrator to verify whether the suspendable micro powder wax can be redispered. The vibration parameters of the vibrator are 10-200 rpm and the time is 5-300 s, preferably 80-150 rpm and 10-60 s.

[0055] Technical effect

[0056] 1. The micro powder wax is prepared by mixing composite modified double-layer compressive agent micro powder T with negatively charged modified micro powder wax, thereby giving the micro powder wax suspension properties;

[0057] 2. Solvent-pretreated suspendable micro powder wax can achieve a suspension effect when added to the coating system, avoiding the floating / sinking phenomenon of micro powder wax components due to insufficient suspension stability under long-term static conditions;

[0058] 3. The addition of suspendable micro powder wax can avoid unevenness in the coating process, prevent defects such as orange peel and pinholes in the paint film, improve the stability of the roller coating process and the appearance quality of the coating film, and has important industrial application value.

[0059] 4. The present invention also provides a method for verifying the suspension effect of suspendable special coatings, which verifies the stability of suspendable micro powder wax by means of heat storage; and verifies whether it can be redispersed after low-frequency oscillation. Attached Figure Description

[0060] Figure 1 This is a photograph of the suspension effect of the suspendable wax powder described in Example 1 of the present invention after being heat-stored at 50°C for 7 days in a coating system;

[0061] Figure 2 This is a photograph of the suspension effect of the suspendable wax powder described in Example 2 of the present invention after being heat-stored at 50°C for 7 days in a coating system;

[0062] Figure 3 This is a photograph of the suspension effect of the suspendable wax powder described in Example 3 of the present invention after being heat-stored at 50°C for 7 days in a coating system.

[0063] Figure 4 This is a photograph of the floating effect of the modified micronized wax described in Comparative Example 1 of the present invention after being heat-stored at 50°C for 7 days in a coating system.

[0064] Figure 5 This is a photograph of the floating effect of the modified micronized wax described in Comparative Example 2 of the present invention after being heat-stored at 50°C for 7 days in a coating system.

[0065] Figure 6 This is a photograph of the floating effect of the modified micronized wax described in Comparative Example 3 of the present invention after being heat-stored at 50°C for 7 days in a coating system.

[0066] Figure 7 This is a photograph of the floating effect of the modified micronized wax described in Comparative Example 4 of the present invention after being heat-stored at 50°C for 7 days in a coating system.

[0067] Figure 8 This is a photograph of the redispersibility effect of the micronized wax after heat storage and vibration in Embodiment 1 of the present invention. Detailed Implementation

[0068] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described below. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the invention.

[0069] The brand and grade information of the resins, curing agents and additives used in this invention are detailed in Tables 1.1 and 1.2.

[0070] Brand brand D50 D90 TW-F6052D Tianwen New Materials 5.62 9.85 TW-F6054P Tianwen New Materials 5.49 9.77 TW-F6057D Tianwen New Materials 5.75 10.02 TW-F6041W Tianwen New Materials 4.86 8.31 TW-F6061W Tianwen New Materials 6.56 11.93

[0071] Table 1.1 Grades and physical properties of several modified micronized waxes used in this invention.

[0072] Brand brand Classification chemical composition BL-F312W Buweilen Environmental Protection Main resin Water-soluble acrylic resin Cymel 325 Zhanxin (Cyanide) curing agent Methyl etherified high-imino melamine BL-D025B Buvelen Environmental Protection drying agent p-Toluenesulfonic acid BL-B508W Buvelen Environmental Protection Defoamer Polyether siloxane polymer BL-G500W Buweilen Environmental Protection Wetting and leveling agents Polyether siloxane copolymer

[0073] Table 1.2 Brand and Grade Information of Several Resins and Additives Used in This Invention

[0074] Example 1: Preparation of surface-negatively charged micronized wax by composite blending method

[0075] Composite modification of S1 double-layer compressive agent yields composite modified double-layer compressive agent micro powder T.

[0076] Preparation of S11 organic nonionic double-layer compressive agent aqueous solution masterbatch M: In a dissolving vessel, first add 495 kg of deionized water, turn on the stirring motor, and keep the stirring speed constant at 8 m / s. Then, slowly add 1.75 kg of PVP, 0.5 kg of SDBS, 0.9 kg of SDS, and 1.85 kg of PEO in sequence. After visually confirming that the organic nonionic double-layer compressive agent is completely dissolved, continue stirring for 30 minutes to ensure that the double-layer compressive agent masterbatch is fully dissolved, and obtain 500 kg of organic nonionic double-layer compressive agent aqueous solution masterbatch M with a mass concentration of 1%, for later use.

[0077] Preparation of S12 weakly acidic inorganic double-layer compressor aqueous solution A: In a dissolving vessel, first add 85 kg of the S11 masterbatch M, turn on the stirring motor, and keep the stirring speed constant at 8.5 m / s. Then, slowly add 75 g FeCl3, 112.5 g Ca(H2PO4)2, 840 g Al(H2PO4)3, 660 g Mg(H2PO4)2, 5.4 kg KH2C6H5O7, 4.8 kg NaHSO3, 37.5 g NaHSO4, 2.7 kg NaHC4H2O4, and 375 g KHC8H4O4, etc. After the inorganic double-layer compressor is visually completely dissolved, continue stirring for 30 min to ensure the full dissolution of the inorganic double-layer compressor, and obtain 100 kg of 15% (pH=6.0) weakly acidic inorganic double-layer compressor aqueous solution A.

[0078] Preparation of S13 weakly alkaline inorganic double-layer compressor aqueous solution B: In a dissolving vessel, first add 85 kg of the S11 masterbatch M, turn on the stirring motor, and keep the stirring speed constant at 7.8 m / s. Then, slowly add 75 g CaO, 75 g Ca(OH)2, 37.5 g NaOH, 2700 g Na2CO3, 5025 g NaHCO3, 37.5 g KOH, 2850 g K2CO3, and 4200 g KHCO3 in sequence. After the inorganic double-layer compressor is visually completely dissolved, continue stirring for 30 min to ensure the full dissolution of the inorganic double-layer compressor, and obtain 100 kg of 15% (pH 9.6) weakly alkaline inorganic double-layer compressor aqueous solution B.

[0079] Preparation of S14 weakly alkaline inorganic double-layer compressor aqueous solution C: In a dissolving vessel, first add 58 kg of the S12 aqueous solution A, turn on the stirring motor, and stir at a linear speed of 8.5 m / s. While keeping the stirring speed constant, slowly add 42 kg of the S13 aqueous solution B. Continue stirring for 30 min. After the two are mixed evenly, 100 kg of composite modified double-layer compressor aqueous solution C with a mass concentration of 15% and pH = 8.2 is obtained.

[0080] Preparation of S15 composite double-layer compressive agent micro powder T: 100 kg of the aqueous solution C described in S14 was taken and transferred by a liquid transfer pump to the nozzle of a spray drying tower with a nozzle diameter of 4 mm and a drying temperature of 85 °C. The material output flow rate of the material transfer pump was adjusted to 350 L / h. 14.85 kg of composite modified double-layer compressive agent micro powder T with D50 = 3.36 μm and D90 = 7.61 μm was collected. The Zeta potential data of the deionized aqueous solution of 1% mass concentration of composite modified double-layer compressive agent micro powder T were tested and are shown in Table 3.

[0081] S2 wax was surface-negatively modified to obtain surface-negatively modified micronized wax.

[0082] Method S21, a composite blending method, involves blending highly negatively charged montmorillonite and highly negatively charged silica micropowders with micropowdered wax in a specific ratio to obtain a surface-modified micropowdered wax. Specifically:

[0083] D50 D90 Zeta potential at pH=7 Montmorillonite 3.65μm 7.21μm -30mV silicon dioxide 2.83μm 6.08μm -42mV

[0084] Table 2. Physical property parameters of highly charged montmorillonite and silica

[0085] S211 took 7.3KG of montmorillonite micro powder and 2.7KG of silica micro powder as described in Table 2 into a V-type mixer, set the mixing motor speed to 35rpm, set the mixing time to 35min, started the mixer, and collected the material after the equipment stopped running, obtaining 9.91KG of modified inorganic material with high negative charge.

[0086] S212 took 96.8KG of F6041W micro powder wax described in Table 1.1 and 3.2KG of the highly negatively charged modified inorganic material described in S211 into a V-type mixer. The mixing motor was set to a speed of 30rpm and the mixing time was set to 30min. The mixer was started and the material was collected after the equipment stopped running, resulting in 99.86KG of surface negatively charged modified micro powder wax.

[0087] In step S3, 1.3 kg of the composite modified double-layer compressor described in step S1 and 98.7 kg of the surface negative charge modified micronized wax described in step S2 were placed in a V-type mixer. The mixing motor was set to a speed of 25 rpm and the mixing time was set to 40 min. The mixer was started and the material was collected after the equipment stopped running. 99.78 kg of suspendable micronized wax based on the double-layer compression theory was obtained. The pH and Zeta potential data of the 1% mass concentration suspendable micronized wax in deionized water were tested and are shown in Table 3.

[0088] In S4, the suspended micronized wax is solvated. First, 49 parts of BCS, 30 parts of PM, 18 parts of DPNB and 3 parts of DPM are stirred and mixed evenly in a reactor to obtain 60KG of mixed solvent with special polarity. Then, 40KG of the suspended micronized wax obtained in S3 is slowly added to the above reactor for solvation treatment. Specifically, the suspendable micronized wax powder is first uniformly dispersed in a mixed solvent at a relatively high stirring speed of 5 m / s. Then, the reaction system is heated to 60°C, the stirring speed is reduced to 1.2 m / s, and the temperature is maintained for 30 min to obtain the solvated suspendable micronized wax powder. The increase in temperature during this process is beneficial to improving the spread of polar groups such as hydroxyl or carboxyl groups on the surface of the modified wax and silanol groups on the surface of highly negatively charged inorganic materials. The decrease in stirring speed is beneficial to improving the compatibility between the surface negatively charged modified wax and the composite double-layer compressor, so that the suspendable micronized wax powder forms a relatively stable whole at the microscopic level. Then, the solid-liquid mixture is separated by centrifugation to obtain a well-solventized, overall stable, wet, multiphase synergistic density-controlled suspendable micronized wax powder.

[0089] In S5, the preparation and application of special coatings include: firstly, testing to obtain a solid content of 85.5% for the wet, suspendable micronized wax after solvent pretreatment as described in S4; then, preparing a clear varnish coating by mixing 39 parts of the base resin BL-R312W and 9 parts of the curing agent Cymel. 325 parts, 2.8 parts neutralizer DMEA, 3.8 parts solvent BCS, 15 parts film-forming aid PM, 3 parts deionized water, 0.3 parts defoamer BL-B508W, and 0.4 parts wetting and leveling agent BL-G500W were mixed in a stirred tank with a stirring linear velocity of 9.85 m / s for 3 hours to obtain 2000 kg of clear varnish coating for later use. 994.15 kg of this clear varnish was taken out and transferred to another stirred tank. Then, 5.85 kg of wet suspendable micronized wax described in S4 was accurately weighed and slowly dispersed into the clear varnish coating system under high-speed dispersion conditions of 10 m / s shear linear velocity. After continuous dispersion for 1.5 hours, 1000 kg of special coating that can achieve the suspension effect of micronized wax was obtained.

[0090] S6 wax powder suspension effect verification: 100g of the varnish coating containing suspendable micro powder wax obtained from S5 was sealed in a transparent plastic bottle and placed in a 50℃ oven for 7 days to accelerate the simulation of the stability of wax powder in the paint tank and confirm the suspension effect of micro powder wax, see Table 4.

[0091] S7 Oscillation Redispersibility Verification: A slight shaking force was applied to the special coating obtained in S6 using an oscillator at 100 rpm for 25 seconds to verify whether the suspendable micro powder wax could be redispersed in the coating. The results are shown in Table 4.

[0092] Comparative Example 1: The aqueous solution of the double-layer compressive agent in S1 is weakly acidic.

[0093] Composite modification of S1 double-layer compressive agent yields composite modified double-layer compressive agent micro powder T.

[0094] Preparation of S11 organic nonionic double-layer compressive agent aqueous solution masterbatch M: In a dissolving vessel, first add 495 kg of deionized water, turn on the stirring motor, and keep the stirring speed constant at 8 m / s. Then, slowly add 1.75 kg of PVP, 0.5 kg of SDBS, 0.9 kg of SDS, and 1.85 kg of PEO in sequence. After visually confirming that the organic nonionic double-layer compressive agent is completely dissolved, continue stirring for 30 minutes to ensure that the double-layer compressive agent masterbatch is fully dissolved, and obtain 500 kg of organic nonionic double-layer compressive agent aqueous solution masterbatch M with a mass concentration of 1%, for later use.

[0095] Preparation of S12 weakly acidic inorganic double-layer compressor aqueous solution A: In a dissolving vessel, first add 85 kg of the S11 masterbatch M, turn on the stirring motor, and keep the stirring speed constant at 8.5 m / s. Then, slowly add 75 g FeCl3, 112.5 g Ca(H2PO4)2, 840 g Al(H2PO4)3, 660 g Mg(H2PO4)2, 5.4 kg KH2C6H5O7, 4.8 kg NaHSO3, 37.5 g NaHSO4, 2.7 kg NaHC4H2O4, and 375 g KHC8H4O4, etc. After the inorganic double-layer compressor is visually completely dissolved, continue stirring for 30 min to ensure the full dissolution of the inorganic double-layer compressor, and obtain 100 kg of 15% (pH=6.2) weakly acidic inorganic double-layer compressor aqueous solution A.

[0096] Preparation of S13 composite modified double-layer compressive agent micro powder T: 100KG of the aqueous solution A described in S12 was taken and transferred by a liquid transfer pump to the nozzle of a spray drying tower with a nozzle diameter of 4mm and a drying temperature of 85℃. The material output flow rate of the material transfer pump was adjusted to 350L / h. 14.77KG of composite modified double-layer compressive agent micro powder T with D50 = 3.42μm and D90 = 7.83μm was obtained. The Zeta potential data of the deionized aqueous solution of 1% mass concentration of composite modified double-layer compressive agent micro powder T were tested and are shown in Table 3.

[0097] S2 wax was surface-negatively modified to obtain surface-negatively modified micronized wax.

[0098] Method S21, a composite blending method, involves blending highly negatively charged montmorillonite and highly negatively charged silica micropowders with micropowdered wax in a specific ratio to obtain a surface-modified micropowdered wax. Specifically:

[0099] S211 took 7.3KG of montmorillonite micro powder and 2.7KG of silica micro powder as described in Table 2 into a V-type mixer, set the mixing motor speed to 35rpm, set the mixing time to 35min, started the mixer, and collected the material after the equipment stopped running, obtaining 9.86KG of modified inorganic material with high negative charge.

[0100] S212 took 96.8KG of the F6041W micro powder wax described in Table 1.1 and 3.2KG of the highly negatively charged modified inorganic material described in S211 into a V-type mixer. The mixing motor was set to a speed of 30rpm and the mixing time was set to 30min. The mixer was started and the material was collected after the equipment stopped running, resulting in 99.69KG of surface negatively charged modified micro powder wax.

[0101] In step S3, 1.3 kg of the composite modified double-layer compressor described in step S1 and 98.7 kg of the surface negative charge modified micronized wax described in step S2 were placed in a V-type mixer. The mixing motor was set to a speed of 25 rpm and the mixing time was set to 40 min. The mixer was started and the material was collected after the equipment stopped running. 99.66 kg of suspendable micronized wax based on the double-layer compression theory was obtained. The pH and Zeta potential data of the 1% mass concentration suspendable micronized wax in deionized water were tested and are shown in Table 3.

[0102] In S4, the suspended micronized wax is solvated. First, 49 parts of BCS, 30 parts of PM, 18 parts of DPNB and 3 parts of DPM are stirred and mixed evenly in a reactor to obtain 60KG of mixed solvent with special polarity. Then, 40KG of the suspended micronized wax obtained in S3 is slowly added to the above reactor for solvation treatment. Specifically, the suspendable micronized wax powder is first uniformly dispersed in a mixed solvent at a relatively high stirring speed of 5 m / s. Then, the reaction system is heated to 60°C, the stirring speed is reduced to 1.2 m / s, and the temperature is maintained for 30 min to obtain the solvated suspendable micronized wax powder. The increase in temperature during this process is beneficial to improving the spread of polar groups such as hydroxyl or carboxyl groups on the surface of the modified wax and silanol groups on the surface of highly negatively charged inorganic materials. The decrease in stirring speed is beneficial to improving the compatibility between the surface negatively charged modified wax and the composite double-layer compressor, so that the suspendable micronized wax powder forms a relatively stable whole at the microscopic level. Then, the solid-liquid mixture is separated by centrifugation to obtain a well-solventized, overall stable, wet, multiphase synergistic density-controlled suspendable micronized wax powder.

[0103] In S5, the preparation and application of special coatings include: firstly, testing to obtain a solid content of 85.5% for the wet, suspendable micronized wax after solvent pretreatment as described in S4; then, preparing a clear varnish coating by mixing 39 parts of the base resin BL-R312W and 9 parts of the curing agent Cymel. 325 parts, 2.8 parts neutralizer DMEA, 3.8 parts solvent BCS, 15 parts film-forming aid PM, 3 parts deionized water, 0.3 parts defoamer BL-B508W, and 0.4 parts wetting and leveling agent BL-G500W were mixed in a stirred tank with a stirring linear velocity of 9.85 m / s for 3 hours to obtain 2000 kg of clear varnish coating for later use. 994.15 kg of this clear varnish was taken out and transferred to another stirred tank. Then, 5.85 kg of wet suspendable micronized wax described in S4 was accurately weighed and slowly dispersed into the clear varnish coating system under high-speed dispersion conditions of 10 m / s shear linear velocity. After continuous dispersion for 1.5 hours, 1000 kg of special coating that can achieve the suspension effect of micronized wax was obtained.

[0104] S6 wax powder suspension effect verification: 100g of the varnish coating containing suspendable micro powder wax obtained from S5 was sealed in a transparent plastic bottle and placed in a 50℃ oven for 7 days to accelerate the simulation of the stability of wax powder in the paint tank and confirm the suspension effect of micro powder wax, see Table 4.

[0105] Comparative Example 2: No surface negative charge modification was performed on the wax.

[0106] Composite modification of S1 double-layer compressive agent yields composite modified double-layer compressive agent micro powder T.

[0107] Preparation of S11 organic nonionic double-layer compressive agent aqueous solution masterbatch M: In a dissolving vessel, first add 495 kg of deionized water, turn on the stirring motor, and keep the stirring speed constant at 8 m / s. Then, slowly add 1.75 kg of PVP, 0.5 kg of SDBS, 0.9 kg of SDS, and 1.85 kg of PEO in sequence. After visually confirming that the organic nonionic double-layer compressive agent is completely dissolved, continue stirring for 30 minutes to ensure that the double-layer compressive agent masterbatch is fully dissolved, and obtain 500 kg of organic nonionic double-layer compressive agent aqueous solution masterbatch M with a mass concentration of 1%, for later use.

[0108] Preparation of S12 weakly acidic inorganic double-layer compressor aqueous solution A: In a dissolving vessel, first add 85 kg of the S11 masterbatch M, turn on the stirring motor, and keep the stirring speed constant at 8.5 m / s. Then, slowly add 75 g FeCl3, 112.5 g Ca(H2PO4)2, 840 g Al(H2PO4)3, 660 g Mg(H2PO4)2, 5.4 kg KH2C6H5O7, 4.8 kg NaHSO3, 37.5 g NaHSO4, 2.7 kg NaHC4H2O4, and 375 g KHC8H4O4, etc. After the inorganic double-layer compressor is visually completely dissolved, continue stirring for 30 min to ensure the full dissolution of the inorganic double-layer compressor, and obtain 100 kg of 15% (pH=6.0) weakly acidic inorganic double-layer compressor aqueous solution A.

[0109] Preparation of S13 weakly alkaline inorganic double-layer compressor aqueous solution B: In a dissolving vessel, first add 85 kg of the S11 masterbatch M, turn on the stirring motor, and keep the stirring speed constant at 7.8 m / s. Then, slowly add 75 g CaO, 75 g Ca(OH)2, 37.5 g NaOH, 2700 g Na2CO3, 5025 g NaHCO3, 37.5 g KOH, 2850 g K2CO3, and 4200 g KHCO3 in sequence. After the inorganic double-layer compressor is visually completely dissolved, continue stirring for 30 min to ensure the full dissolution of the inorganic double-layer compressor, and obtain 100 kg of 15% (pH 9.6) weakly alkaline inorganic double-layer compressor aqueous solution B.

[0110] Preparation of S14 weakly alkaline inorganic double-layer compressor aqueous solution C: In a dissolving vessel, first add 58 kg of the S12 aqueous solution A, turn on the stirring motor, and stir at a linear speed of 8.5 m / s. While keeping the stirring speed constant, slowly add 42 kg of the S13 aqueous solution B. Continue stirring for 30 min. After the two are mixed evenly, 100 kg of composite modified double-layer compressor aqueous solution C with a mass concentration of 15% and pH = 8.2 is obtained.

[0111] Preparation of S15 composite modified double-layer compressive agent micro powder T: 100KG of the aqueous solution C described in S14 was taken and transferred by a liquid transfer pump to the nozzle of a spray drying tower with a nozzle diameter of 4mm and a drying temperature of 85℃. The material output flow rate of the material transfer pump was adjusted to 350L / h. 14.85KG of composite modified double-layer compressive agent micro powder T with D50 = 3.36μm and D90 = 7.61μm was obtained. The Zeta potential data of the deionized aqueous solution of 1% mass concentration of composite modified double-layer compressive agent micro powder T were tested and are shown in Table 3.

[0112] In the preparation of the suspended micronized wax based on the double-layer compression theory, 1.3 kg of the composite modified double-layer compression agent micronized powder T described in S1 and 98.7 kg of the TW-F6041W micronized wax described in Table 1.1 were placed in a V-type mixer. The mixing motor was set to a speed of 25 rpm and the mixing time was set to 40 min. The mixer was started and the material was collected after the equipment stopped running. 99.67 kg of the suspended micronized wax based on the double-layer compression theory was obtained. The pH and Zeta potential data of the 1% mass concentration of the suspended micronized wax in deionized water were tested and are shown in Table 3.

[0113] In S3, the suspended micronized wax is solvated. First, 49 parts of BCS, 30 parts of PM, 18 parts of DPNB and 3 parts of DPM are stirred and mixed evenly in a reactor to obtain 60KG of mixed solvent with special polarity. Then, 40KG of the suspended micronized wax obtained in S2 is slowly added to the above reactor for solvation treatment. Specifically, the suspendable micronized wax powder is first uniformly dispersed in a mixed solvent at a relatively high stirring speed of 5 m / s. Then, the reaction system is heated to 60°C, the stirring speed is reduced to 1.2 m / s, and the temperature is maintained for 30 min to obtain the solvated suspendable micronized wax powder. The increase in temperature during this process is beneficial to improving the spread of polar groups such as hydroxyl or carboxyl groups on the surface of the modified wax and silanol groups on the surface of highly negatively charged inorganic materials. The decrease in stirring speed is beneficial to improving the compatibility between the surface negatively charged modified wax and the composite double-layer compressor, so that the suspendable micronized wax powder forms a relatively stable whole at the microscopic level. Then, the solid-liquid mixture is separated by centrifugation to obtain a well-solventized, overall stable, wet, multiphase synergistic density-controlled suspendable micronized wax powder.

[0114] In S4, the preparation and application of the special coating includes: firstly, testing to obtain a solid content of 84.6% for the wet, suspendable micronized wax after the solvent pretreatment described in S3; then, preparing a clear varnish coating by mixing 39 parts of the base resin BL-R312W and 9 parts of the curing agent Cymel. 325, 2.8 parts of neutralizer DMEA, 3.8 parts of solvent BCS, 15 parts of film-forming aid PM, 3 parts of deionized water, 0.3 parts of defoamer BL-B508W, and 0.4 parts of wetting and leveling agent BL-G500W were mixed in a stirred tank with a stirring linear velocity of 9.85 m / s for 3 hours to obtain 2000 kg of clear varnish coating for later use. 994.09 kg of this clear varnish was taken out and transferred to another stirred tank. Then, 5.91 kg of wet suspendable micronized wax described in S3 was accurately weighed and slowly dispersed into the clear varnish coating system under high-speed dispersion conditions of 10 m / s shear linear velocity. After continuous dispersion for 1.5 hours, 1000 kg of special coating that can achieve the suspension effect of micronized wax was obtained.

[0115] S5 wax powder suspension effect verification: 100g of the varnish coating containing suspendable micro powder wax obtained from S4 was sealed in a transparent plastic bottle and placed in a 50℃ oven for 7 days to accelerate the simulation of the stability of wax powder in the paint tank and confirm the suspension effect of micro powder wax, see Table 4.

[0116] Example 2: Preparation of surface-negatively charged micronized wax by polymer alloying

[0117] Composite modification of S1 double-layer compressive agent yields composite modified double-layer compressive agent micro powder T.

[0118] Preparation of S11 organic nonionic double-layer compressive agent aqueous solution masterbatch M: In a dissolving vessel, first add 495 kg of deionized water, turn on the stirring motor, and keep the stirring speed constant at 8 m / s. Then, slowly add 1.75 kg of PVP, 0.5 kg of SDBS, 0.9 kg of SDS, and 1.85 kg of PEO in sequence. After visually confirming that the organic nonionic double-layer compressive agent is completely dissolved, continue stirring for 30 minutes to ensure that the double-layer compressive agent masterbatch is fully dissolved, and obtain 500 kg of organic nonionic double-layer compressive agent aqueous solution masterbatch M with a mass concentration of 1%, for later use.

[0119] Preparation of S12 weakly acidic inorganic double-layer compressor aqueous solution A: In a dissolving vessel, first add 85 kg of the S11 masterbatch M, turn on the stirring motor, and keep the stirring speed constant at 8.5 m / s. Then, slowly add 75 g FeCl3, 112.5 g Ca(H2PO4)2, 840 g Al(H2PO4)3, 660 g Mg(H2PO4)2, 5.4 kg KH2C6H5O7, 4.8 kg NaHSO3, 37.5 g NaHSO4, 2.7 kg NaHC4H2O4, and 375 g KHC8H4O4, etc. After the inorganic double-layer compressor is visually completely dissolved, continue stirring for 30 min to ensure the full dissolution of the inorganic double-layer compressor, and obtain 100 kg of 15% (pH=6.0) weakly acidic inorganic double-layer compressor aqueous solution A.

[0120] Preparation of S13 weakly alkaline inorganic double-layer compressor aqueous solution B: In a dissolving vessel, first add 85 kg of the S11 masterbatch M, turn on the stirring motor, and keep the stirring speed constant at 7.8 m / s. Then, slowly add 75 g CaO, 75 g Ca(OH)2, 37.5 g NaOH, 2700 g Na2CO3, 5025 g NaHCO3, 37.5 g KOH, 2850 g K2CO3, and 4200 g KHCO3 in sequence. After the inorganic double-layer compressor is visually completely dissolved, continue stirring for 30 min to ensure the full dissolution of the inorganic double-layer compressor, and obtain 100 kg of 15% (pH 9.6) weakly alkaline inorganic double-layer compressor aqueous solution B.

[0121] Preparation of S14 weakly alkaline inorganic double-layer compressor aqueous solution C: In a dissolving vessel, first add 58 kg of the S12 aqueous solution A, turn on the stirring motor, and stir at a linear speed of 8.5 m / s. While keeping the stirring speed constant, slowly add 42 kg of the S13 aqueous solution B. Continue stirring for 30 min. After the two are mixed evenly, 100 kg of composite modified double-layer compressor aqueous solution C with a mass concentration of 15% and pH = 8.3 is obtained.

[0122] Preparation of S15 composite double-layer compressive agent micro powder T: 100KG of the aqueous solution C described in S14 was taken and transferred by a liquid transfer pump to the nozzle of a spray drying tower with a nozzle diameter of 4mm and a drying temperature of 85℃. The material output flow rate of the material transfer pump was adjusted to 350L / h. 14.77KG of composite double-layer compressive agent micro powder T with D50 = 3.39μm and D90 = 7.62μm was obtained. The Zeta potential data of the deionized aqueous solution of the 1% mass concentration of the composite modified double-layer compressive agent micro powder T were tested and are shown in Table 3.

[0123] S2 wax was surface-negatively modified to obtain surface-negatively modified micronized wax.

[0124] Method S21, Preparation of Surface Negatively Charged Modified Micropowder Wax by Polymer Alloy Method:

[0125] In S211, 10 kg of high-acid-value polar wax and 90 kg of low-acid-value weakly polar or non-polar wax are added to a melting vessel and heated to melt and stir evenly. The high-acid-value polar wax includes 9 kg of oxidized polyethylene wax with an acid value of 35 mg KH / g and 1 kg of sugarcane wax with an acid value of 13 mg KH / g. The low-acid-value weakly polar or non-polar wax includes 85 kg of polyethylene wax and 5 kg of polypropylene wax. The heating temperature is set to 210℃ and the stirring linear speed is 6.4 m / s. After the wax in the vessel is completely melted, stirring is continued for 0.5 h to ensure that the non-polar polyethylene wax, polypropylene wax and high-polarity oxidized polyethylene wax and sugarcane wax in the vessel are fully mixed evenly, resulting in 100 kg of surface negatively charged modified wax melt.

[0126] In step S212, the stirring speed is reduced to 3 m / s, and the surface-negatively charged modified wax melt described in step S211 is transferred to a nozzle with a diameter of 3 mm via a material transfer pump and sprayed out. The material transfer pump has a transfer flow rate of 50 L / h, resulting in 95.5 kg of surface-negatively charged modified micro powder wax with D50 = 4.25 μm and D90 = 8.32 μm.

[0127] In step S3, 1.3 kg of the composite modified double-layer compressor described in step S1 and 98.7 kg of the surface negative charge modified micronized wax described in step S2 were placed in a V-type mixer. The mixing motor was set to a speed of 30 rpm and the mixing time was set to 40 min. The mixer was started and the material was collected after the equipment stopped running. 99.35 kg of suspendable micronized wax based on the double-layer compression theory was obtained. The pH and Zeta potential data of the 1% mass concentration suspendable micronized wax in deionized water were tested and are shown in Table 3.

[0128] In S4, the suspended micronized wax is solvated. First, 49 parts of BCS, 30 parts of PM, 18 parts of DPNB and 3 parts of DPM are stirred and mixed evenly in a reactor to obtain 60KG of mixed solvent with special polarity. Then, 40KG of the suspended micronized wax obtained in S3 is slowly added to the above reactor for solvation treatment. Specifically, the suspendable micronized wax powder is first uniformly dispersed in a mixed solvent at a relatively high stirring speed of 5 m / s. Then, the reaction system is heated to 60°C, the stirring speed is reduced to 1.2 m / s, and the temperature is maintained for 30 min to obtain the solvated suspendable micronized wax powder. The increase in temperature during this process is beneficial to improving the spread of polar groups such as hydroxyl or carboxyl groups on the surface of the modified wax and silanol groups on the surface of highly negatively charged inorganic materials. The decrease in stirring speed is beneficial to improving the compatibility between the surface negatively charged modified wax and the composite double-layer compressor, so that the suspendable micronized wax powder forms a relatively stable whole at the microscopic level. Then, the solid-liquid mixture is separated by centrifugation to obtain a well-solventized, overall stable, wet, multiphase synergistic density-controlled suspendable micronized wax powder.

[0129] In S5, the preparation and application of the special coating includes: firstly, testing to obtain a solid content of 85.4% for the wet, suspendable micronized wax after the solvent pretreatment described in S4; then, preparing a clear varnish coating by mixing 39 parts of the base resin BL-R312W and 9 parts of the curing agent Cymel. 325, 2.8 parts of neutralizer DMEA, 3.8 parts of solvent BCS, 15 parts of film-forming aid PM, 3 parts of deionized water, 0.3 parts of defoamer BL-B508W, and 0.4 parts of wetting and leveling agent BL-G500W were mixed in a stirred tank with a stirring linear velocity of 9.85 m / s for 3 hours to obtain 2000 kg of clear varnish coating for later use. 994.14 kg of this clear varnish was taken out and transferred to another stirred tank. Then, 5.86 kg of wet suspendable micronized wax described in S4 was accurately weighed and slowly dispersed into the clear varnish coating system under high-speed dispersion conditions of 10 m / s shear linear velocity. After continuous dispersion for 1.5 hours, 1000 kg of special coating that can achieve the suspension effect of micronized wax was obtained.

[0130] S6 wax powder suspension effect verification: 100g of the varnish coating containing suspendable micro powder wax obtained from S5 was sealed in a transparent plastic bottle and placed in a 50℃ oven for 7 days to accelerate the simulation of the stability of wax powder in the paint tank and confirm the suspension effect of micro powder wax, see Table 4.

[0131] S7 Oscillation Redispersibility Verification: A slight shaking force was applied to the special coating obtained in S6 using an oscillator at 100 rpm for 25 seconds to verify whether the suspendable micro powder wax could be redispersed in the coating. The results are shown in Table 4.

[0132] Comparative Example 3: No solvation pretreatment was performed on the micronized wax.

[0133] Composite modification of S1 double-layer compressive agent yields composite modified double-layer compressive agent micro powder T.

[0134] Preparation of S11 organic nonionic double-layer compressive agent aqueous solution masterbatch M: In a dissolving vessel, first add 495 kg of deionized water, turn on the stirring motor, and keep the stirring speed constant at 8 m / s. Then, slowly add 1.75 kg of PVP, 0.5 kg of SDBS, 0.9 kg of SDS, and 1.85 kg of PEO in sequence. After visually confirming that the organic nonionic double-layer compressive agent is completely dissolved, continue stirring for 30 minutes to ensure that the double-layer compressive agent masterbatch is fully dissolved, and obtain 500 kg of organic nonionic double-layer compressive agent aqueous solution masterbatch M with a mass concentration of 1%, for later use.

[0135] Preparation of S12 weakly acidic inorganic double-layer compressor aqueous solution A: In a dissolving vessel, first add 85 kg of the S11 masterbatch M, turn on the stirring motor, and keep the stirring speed constant at 8.5 m / s. Then, slowly add 75 g FeCl3, 112.5 g Ca(H2PO4)2, 840 g Al(H2PO4)3, 660 g Mg(H2PO4)2, 5.4 kg KH2C6H5O7, 4.8 kg NaHSO3, 37.5 g NaHSO4, 2.7 kg NaHC4H2O4, and 375 g KHC8H4O4, etc. After the inorganic double-layer compressor is visually completely dissolved, continue stirring for 30 min to ensure the full dissolution of the inorganic double-layer compressor, and obtain 100 kg of 15% (pH=6.0) weakly acidic inorganic double-layer compressor aqueous solution A.

[0136] Preparation of S13 weakly alkaline inorganic double-layer compressor aqueous solution B: In a dissolving vessel, first add 85 kg of the S11 masterbatch M, turn on the stirring motor, and keep the stirring speed constant at 7.8 m / s. Then, slowly add 75 g CaO, 75 g Ca(OH)2, 37.5 g NaOH, 2700 g Na2CO3, 5025 g NaHCO3, 37.5 g KOH, 2850 g K2CO3, and 4200 g KHCO3 in sequence. After the inorganic double-layer compressor is visually completely dissolved, continue stirring for 30 min to ensure the full dissolution of the inorganic double-layer compressor, and obtain 100 kg of 15% (pH 9.6) weakly alkaline inorganic double-layer compressor aqueous solution B.

[0137] Preparation of S14 weakly alkaline inorganic double-layer compressor aqueous solution C: In a dissolving vessel, first add 58 kg of the S12 aqueous solution A, turn on the stirring motor, and stir at a linear speed of 8.5 m / s. While keeping the stirring speed constant, slowly add 42 kg of the S13 aqueous solution B. Continue stirring for 30 min. After the two are mixed evenly, 100 kg of composite modified double-layer compressor aqueous solution C with a mass concentration of 15% and pH = 8.3 is obtained.

[0138] Preparation of S15 composite double-layer compressive agent micro powder T: 100KG of the aqueous solution C described in S14 was taken and transferred by a liquid transfer pump to the nozzle of a spray drying tower with a nozzle diameter of 4mm and a drying temperature of 85℃. The material output flow rate of the material transfer pump was adjusted to 350L / h. 14.75KG of composite modified double-layer compressive agent micro powder T with D50 = 3.55μm and D90 = 7.87μm was collected. The Zeta potential data of the deionized aqueous solution of 1% mass concentration of composite modified double-layer compressive agent micro powder T were tested and are shown in Table 3.

[0139] S2 wax was surface-negatively modified to obtain surface-negatively modified micronized wax.

[0140] Method S21, Preparation of Surface Negatively Charged Modified Micropowder Wax by Polymer Alloy Method:

[0141] In S211, 10 kg of high-acid-value polar wax and 90 kg of low-acid-value weakly polar or non-polar wax are added to a melting vessel and heated to melt and stir evenly. The high-acid-value polar wax includes 9 kg of oxidized polyethylene wax with an acid value of 35 mg KH / g and 1 kg of sugarcane wax with an acid value of 13 mg KH / g. The low-acid-value weakly polar or non-polar wax includes 85 kg of polyethylene wax and 5 kg of polypropylene wax. The heating temperature is set to 210℃ and the stirring linear speed is 6.4 m / s. After the wax in the vessel is completely melted, stirring is continued for 0.5 h to ensure that the non-polar polyethylene wax, polypropylene wax and high-polarity oxidized polyethylene wax and sugarcane wax in the vessel are fully mixed evenly, resulting in 100 kg of surface negatively charged modified wax melt.

[0142] In step S212, the stirring speed is reduced to 3 m / s, and the surface-negatively charged modified wax melt described in step S211 is transferred to a nozzle with a diameter of 3 mm via a material transfer pump and sprayed out. The material transfer pump has a transfer flow rate of 50 L / h, resulting in 97.0 kg of surface-negatively charged modified micro powder wax with D50 = 4.22 μm and D90 = 8.44 μm.

[0143] In step S3, 1.3 kg of the composite modified double-layer compressor described in step S1 and 98.7 kg of the surface negative charge modified micronized wax described in step S2 were placed in a V-type mixer. The mixing motor was set to a speed of 30 rpm and the mixing time was set to 40 min. The mixer was started and the material was collected after the equipment stopped running. 99.35 kg of suspendable micronized wax based on the double-layer compression theory was obtained. The pH and Zeta potential data of the 1% mass concentration suspendable micronized wax in deionized water were tested and are shown in Table 3.

[0144] In S4, the preparation and application of the special coating includes: firstly, preparing a clear varnish coating by mixing 39 parts of the main resin BL-R312W, 9 parts of the curing agent Cymel 325, 2.8 parts of the neutralizing agent DMEA, 3.8 parts of the solvent BCS, 15 parts of the film-forming aid PM, 3 parts of deionized water, 0.3 parts of the defoamer BL-B508W, and 0.4 parts of the wetting and leveling agent BL-G500W in a stirring vessel with a stirring linear velocity of 9.85 m / s for 3 hours to obtain 2000 kg of clear varnish coating for later use; then, taking 995 kg of this clear varnish and transferring it to another stirring vessel, and then accurately weighing 5 kg of the suspendable micronized wax described in S3, and slowly dispersing it into the clear varnish coating system under high-speed dispersion conditions of 10 m / s shear linear velocity, and continuing to disperse for 1.5 hours to obtain 1000 kg of a special coating that can achieve a micronized wax suspension effect;

[0145] S6 wax powder suspension effect verification: 100g of the varnish coating containing suspendable micro powder wax obtained from S5 was sealed in a transparent plastic bottle and placed in a 50℃ oven for 7 days to accelerate the simulation of the stability of wax powder in the paint tank and confirm the suspension effect of micro powder wax, see Table 4.

[0146] Comparative Example 4: Aqueous Masterbatch M without Organic Nonionic Double Layer Compressor

[0147] Composite modification of S1 double-layer compressive agent yields composite modified double-layer compressive agent micro powder T.

[0148] Preparation of S11 weakly acidic inorganic double-layer compressor aqueous solution A: In a dissolving vessel, first add 85 kg of deionized water, turn on the stirring motor, and keep the stirring speed constant at 8.5 m / s. Then, slowly add 75 g FeCl3, 112.5 g Ca(H2PO4)2, 840 g Al(H2PO4)3, 660 g Mg(H2PO4)2, 5.4 kg KH2C6H5O7, 4.8 kg NaHSO3, 37.5 g NaHSO4, 2.7 kg NaHC4H2O4, and 375 g KHC8H4O4, etc. After the inorganic double-layer compressor is visually completely dissolved, continue stirring for 30 min to ensure the full dissolution of the inorganic double-layer compressor, to obtain 100 kg of 15% (pH 6.0) weakly acidic inorganic double-layer compressor aqueous solution A.

[0149] Preparation of S12 weakly alkaline inorganic double-layer compressor aqueous solution B: In a dissolving vessel, first add 85 kg of deionized water, turn on the stirring motor, and keep the stirring speed constant at 7.8 m / s. Then, slowly add 75 g CaO, 75 g Ca(OH)2, 37.5 g NaOH, 2700 g Na2CO3, 5025 g NaHCO3, 37.5 g KOH, 2850 g K2CO3, and 4200 g KHCO3 in sequence. After the inorganic double-layer compressor is visually completely dissolved, continue stirring for 30 minutes to ensure the full dissolution of the inorganic double-layer compressor, resulting in 100 kg of 15% (pH 9.6) weakly alkaline inorganic double-layer compressor aqueous solution B.

[0150] Preparation of S13 weakly alkaline inorganic double-layer compressor aqueous solution C: In a dissolving vessel, first add 58 kg of the S11 aqueous solution A, turn on the stirring motor, and stir at a linear speed of 8.5 m / s. While keeping the stirring speed constant, slowly add 42 kg of the S12 aqueous solution B. Continue stirring for 30 min. After the two are mixed evenly, 100 kg of composite modified double-layer compressor aqueous solution C with a mass concentration of 15% and pH = 8.3 is obtained.

[0151] Preparation of S15 composite double-layer compressive agent micro powder T: 100KG of the aqueous solution C described in S13 was taken and transferred by a liquid transfer pump to the nozzle of a spray drying tower with a nozzle diameter of 4mm and a drying temperature of 85℃. The material output flow rate of the material transfer pump was adjusted to 350L / h. 14.77KG of composite modified double-layer compressive agent micro powder T with D50 = 3.55μm and D90 = 7.77μm was obtained. The Zeta potential data of the deionized aqueous solution of the composite modified double-layer compressive agent micro powder T with a mass concentration of 1% were tested and are shown in Table 3.

[0152] S2 wax was surface-negatively modified to obtain surface-negatively modified micronized wax.

[0153] Method S21, Preparation of Surface Negatively Charged Modified Micropowder Wax by Polymer Alloy Method:

[0154] In S211, 10 kg of high-acid-value polar wax and 90 kg of low-acid-value weakly polar or non-polar wax are added to a melting vessel and heated to melt and stir evenly. The high-acid-value polar wax includes 9 kg of oxidized polyethylene wax with an acid value of 35 mg KH / g and 1 kg of sugarcane wax with an acid value of 13 mg KH / g. The low-acid-value weakly polar or non-polar wax includes 85 kg of polyethylene wax and 5 kg of polypropylene wax. The heating temperature is set to 210℃ and the stirring linear speed is 6.4 m / s. After the wax in the vessel is completely melted, stirring is continued for 0.5 h to ensure that the non-polar polyethylene wax, polypropylene wax and high-polarity oxidized polyethylene wax and sugarcane wax in the vessel are fully mixed evenly, resulting in 100 kg of surface negatively charged modified wax melt.

[0155] In step S212, the stirring speed is reduced to 3 m / s, and the surface-negatively charged modified wax melt described in step S211 is transferred to a nozzle with a diameter of 3 mm via a material transfer pump and sprayed out. The material transfer pump has a flow rate of 50 L / h, resulting in 95.5 kg of surface-negatively charged modified micro powder wax with D50 = 4.22 μm and D90 = 8.44 μm.

[0156] In step S3, 1.3 kg of the composite modified double-layer compressor described in step S1 and 98.7 kg of the surface negative charge modified micronized wax described in step S2 were placed in a V-type mixer. The mixing motor was set to a speed of 30 rpm and the mixing time was set to 40 min. The mixer was started and the material was collected after the equipment stopped running. 99.35 kg of suspendable micronized wax based on the double-layer compression theory was obtained. The pH and Zeta potential data of the 1% mass concentration suspendable micronized wax in deionized water were tested and are shown in Table 3.

[0157] In S4, the suspended micronized wax is solvated. First, 49 parts of BCS, 30 parts of PM, 18 parts of DPNB and 3 parts of DPM are stirred and mixed evenly in a reactor to obtain 60KG of mixed solvent with special polarity. Then, 40KG of the suspended micronized wax obtained in S3 is slowly added to the above reactor for solvation treatment. Specifically, the suspendable micronized wax powder is first uniformly dispersed in a mixed solvent at a relatively high stirring speed of 5 m / s. Then, the reaction system is heated to 60°C, the stirring speed is reduced to 1.2 m / s, and the temperature is maintained for 30 min to obtain the solvated suspendable micronized wax powder. The increase in temperature during this process is beneficial to improving the spread of polar groups such as hydroxyl or carboxyl groups on the surface of the modified wax and silanol groups on the surface of highly negatively charged inorganic materials. The decrease in stirring speed is beneficial to improving the compatibility between the surface negatively charged modified wax and the composite double-layer compressor, so that the suspendable micronized wax powder forms a relatively stable whole at the microscopic level. Then, the solid-liquid mixture is separated by centrifugation to obtain a well-solventized, overall stable, wet, multiphase synergistic density-controlled suspendable micronized wax powder.

[0158] In S5, the preparation and application of the special coating includes: firstly, testing to obtain a solid content of 85.4% for the wet, suspendable micronized wax after the solvent pretreatment described in S4; then, preparing a clear varnish coating by mixing 39 parts of the base resin BL-R312W and 9 parts of the curing agent Cymel. 325, 2.8 parts of neutralizer DMEA, 3.8 parts of solvent BCS, 15 parts of film-forming aid PM, 3 parts of deionized water, 0.3 parts of defoamer BL-B508W, and 0.4 parts of wetting and leveling agent BL-G500W were mixed in a stirred tank with a stirring linear velocity of 9.85 m / s for 3 hours to obtain 2000 kg of clear varnish coating for later use. 994.14 kg of this clear varnish was taken out and transferred to another stirred tank. Then, 5.86 kg of wet suspendable micronized wax described in S4 was accurately weighed and slowly dispersed into the clear varnish coating system under high-speed dispersion conditions of 10 m / s shear linear velocity. After continuous dispersion for 1.5 hours, 1000 kg of special coating that can achieve the suspension effect of micronized wax was obtained.

[0159] S6 wax powder suspension effect verification: 100g of the varnish coating containing suspendable micro powder wax obtained from S5 was sealed in a transparent plastic bottle and placed in a 50℃ oven for 7 days to accelerate the simulation of the stability of wax powder in the paint tank and confirm the suspension effect of micro powder wax, see Table 4.

[0160] Example 3

[0161] Composite modification of S1 double-layer compressive agent yields composite modified double-layer compressive agent micro powder T.

[0162] Preparation of S11 organic nonionic double-layer compressive agent aqueous solution masterbatch M: In a dissolving vessel, first add 495 kg of deionized water, turn on the stirring motor, and keep the stirring speed constant at 8 m / s. Then, slowly add 1.75 kg of PVP, 0.5 kg of SDBS, 0.9 kg of SDS, and 1.85 kg of PEO in sequence. After visually confirming that the organic nonionic double-layer compressive agent is completely dissolved, continue stirring for 30 minutes to ensure that the double-layer compressive agent masterbatch is fully dissolved, and obtain 500 kg of organic nonionic double-layer compressive agent aqueous solution masterbatch M with a mass concentration of 1%, for later use.

[0163] Preparation of S12 weakly acidic inorganic double-layer compressor aqueous solution A: In a dissolving vessel, first add 85 kg of the S11 masterbatch M, turn on the stirring motor, and keep the stirring speed constant at a linear speed of 9 m / s. Then, slowly add 60 g FeCl3, 72.5 g Ca(H2PO4)2, 800 g Al(H2PO4)3, 520 g Mg(H2PO4)2, 6 kg KH2C6H5O7, 4.45 kg NaHSO3, 22.5 g NaHSO4, 2.7 kg NaHC4H2O4, and 375 g KHC8H4O4, etc. After the inorganic double-layer compressor is visually completely dissolved, continue stirring for 30 min to ensure the full dissolution of the inorganic double-layer compressor, and obtain 100 kg of 15% (pH=6.3) weakly acidic inorganic double-layer compressor aqueous solution A.

[0164] Preparation of S13 weakly alkaline inorganic double-layer compressor aqueous solution B: In a dissolving vessel, first add 85 kg of the S11 masterbatch M, turn on the stirring motor, and keep the stirring speed constant at a linear speed of 7 m / s. Then, slowly add 75 g CaO, 75 g Ca(OH)2, 37.5 g NaOH, 2700 g Na2CO3, 5025 g NaHCO3, 37.5 g KOH, 2850 g K2CO3, and 4200 g KHCO3 in sequence. After the inorganic double-layer compressor is visually completely dissolved, continue stirring for 30 minutes to ensure the full dissolution of the inorganic double-layer compressor, and obtain 100 kg of 15% (pH=9.6) weakly alkaline inorganic double-layer compressor aqueous solution B.

[0165] Preparation of S14 weakly alkaline inorganic double-layer compressor aqueous solution C: In a dissolving vessel, first add 58 kg of the S12 aqueous solution A, turn on the stirring motor, and stir at a linear speed of 8.5 m / s. While keeping the stirring speed constant, slowly add 42 kg of the S13 aqueous solution B. Continue stirring for 30 min. After the two are mixed evenly, 100 kg of composite modified double-layer compressor aqueous solution C with a mass concentration of 15% and a pH of 8.35 is obtained.

[0166] Preparation of S15 composite double-layer compressive agent micro powder T: 100KG of the aqueous solution C described in S14 was taken and transferred by a liquid transfer pump to the nozzle of a spray drying tower with a nozzle diameter of 4mm and a drying temperature of 85℃. The material output flow rate of the material transfer pump was adjusted to 350L / h. 14.85KG of composite modified double-layer compressive agent micro powder T with D50 = 3.30μm and D90 = 7.55μm was collected. The Zeta potential data of the deionized aqueous solution of 1% mass concentration of composite modified double-layer compressive agent micro powder T were tested and are shown in Table 3.

[0167] S2 wax was surface-negatively modified to obtain surface-negatively modified micronized wax.

[0168] Method S21, a composite blending method, involves blending highly negatively charged montmorillonite and highly negatively charged silica micropowders with micropowdered wax in a specific ratio to obtain a surface-modified micropowdered wax. Specifically:

[0169] S211 took 7.3KG of montmorillonite micro powder and 2.7KG of silica micro powder as described in Table 2 into a V-type mixer, set the mixing motor speed to 30rpm, set the mixing time to 40min, started the mixer, and collected the material after the equipment stopped running, obtaining 9.89KG of modified inorganic material with high negative charge.

[0170] S212 took 96.8KG of the F6041W micro powder wax described in Table 1.1 and 3.2KG of the highly negatively charged modified inorganic material described in S211 into a V-type mixer. The mixing motor was set to a speed of 30rpm and the mixing time was set to 30min. The mixer was started and the material was collected after the equipment stopped running, resulting in 99.87KG of surface negatively charged modified micro powder wax.

[0171] In step S3, 1.3 kg of the composite modified double-layer compressor described in step S1 and 98.7 kg of the surface negative charge modified micronized wax described in step S2 were placed in a V-type mixer. The mixing motor was set to a speed of 30 rpm and the mixing time was set to 40 min. The mixer was started and the material was collected after the equipment stopped running. 99.82 kg of suspendable micronized wax based on the double-layer compression theory was obtained. The pH and Zeta potential data of the 1% mass concentration suspendable micronized wax in deionized water were tested and are shown in Table 3.

[0172] In S4, the suspended micronized wax is solvated. First, 49 parts of BCS, 30 parts of PM, 18 parts of DPNB and 3 parts of DPM are stirred and mixed evenly in a reactor to obtain 60KG of mixed solvent with special polarity. Then, 40KG of the suspended micronized wax obtained in S3 is slowly added to the above reactor for solvation treatment. Specifically, the suspendable micronized wax powder is first uniformly dispersed in a mixed solvent at a relatively high stirring speed of 5 m / s. Then, the reaction system is heated to 60°C, the stirring speed is reduced to 1.2 m / s, and the temperature is maintained for 30 min to obtain the solvated suspendable micronized wax powder. The increase in temperature during this process is beneficial to improving the spread of polar groups such as hydroxyl or carboxyl groups on the surface of the modified wax and silanol groups on the surface of highly negatively charged inorganic materials. The decrease in stirring speed is beneficial to improving the compatibility between the surface negatively charged modified wax and the composite double-layer compressor, so that the suspendable micronized wax powder forms a relatively stable whole at the microscopic level. Then, the solid-liquid mixture is separated by centrifugation to obtain a well-solventized, overall stable, wet, multiphase synergistic density-controlled suspendable micronized wax powder.

[0173] In S5, the preparation and application of special coatings include: firstly, testing to obtain a solid content of 85.5% for the wet, suspendable micronized wax after solvent pretreatment as described in S4; then, preparing a clear varnish coating by mixing 39 parts of the base resin BL-R312W and 9 parts of the curing agent Cymel. 325 parts, 2.8 parts neutralizer DMEA, 3.8 parts solvent BCS, 15 parts film-forming aid PM, 3 parts deionized water, 0.3 parts defoamer BL-B508W, and 0.4 parts wetting and leveling agent BL-G500W were mixed in a stirred tank with a stirring linear velocity of 9.85 m / s for 3 hours to obtain 2000 kg of clear varnish coating for later use. 994.15 kg of this clear varnish was taken out and transferred to another stirred tank. Then, 5.85 kg of wet suspendable micronized wax described in S4 was accurately weighed and slowly dispersed into the clear varnish coating system under high-speed dispersion conditions of 10 m / s shear linear velocity. After continuous dispersion for 1.5 hours, 1000 kg of special coating that can achieve the suspension effect of micronized wax was obtained.

[0174] S6 wax powder suspension effect verification: 100g of the varnish coating containing suspendable micro powder wax obtained from S5 was sealed in a transparent plastic bottle and placed in a 50℃ oven for 7 days to accelerate the simulation of the stability of wax powder in the paint tank and confirm the suspension effect of micro powder wax, see Table 4.

[0175] S7 Oscillation Redispersibility Verification: A slight shaking force was applied to the special coating obtained in S6 using an oscillator at 100 rpm for 25 seconds to verify whether the suspendable micro powder wax could be redispersed in the coating. The results are shown in Table 4.

[0176]

[0177] Table 3. Zeta potentials of composite modified double-layer compressor powder T and pH & Zeta potentials of suspendable micronized wax in Examples 1-3 and Comparative Examples 1-4.

[0178] Combination Figure 1-7 The results of comparing the wax powder suspension state of the special coatings described in Examples 1-3 and Comparative Examples 1-4 after 7 days of heat storage at 50°C are shown in Table 4.

[0179]

[0180] Table 4. Thermal storage suspension effect and vibration redispersion results of Examples 1-3 and Comparative Examples 1-4

[0181] By comparing the data in Tables 3 and 4, it is easy to see that the suspension effect of suspendable micronized wax in varnish coating systems is closely related to factors such as the pH of the micronized wax, its Zeta potential, the pH of the double-layer compressor, the negative charge modification of the wax, the solvation pretreatment of the suspendable micronized wax, and whether an aqueous solution of an organic nonionic double-layer compressor is used as the masterbatch in the preparation of the double-layer compressor. Specifically:

[0182] 1. By comparing the results of Example 1 and Comparative Example 1, in the preparation process of S1 composite double-layer compressor micro powder T in Example 1, the pH of the aqueous solution of the composite double-layer compressor plays an important role in the suspension effect of wax powder in the varnish coating. The weakly alkaline double-layer compressor micro powder T, after being blended with micro powder wax whose surface has been modified by negative charge, is conducive to improving the formation of a stable double-layer compression system of suspendable micro powder wax in the coating system. Moreover, the suspendable micro powder wax has a large Zeta potential value, reaching -40.8mV. In contrast, the aqueous solution of the composite double-layer compressor in Comparative Example 1 is weakly acidic, and its corresponding zeta potential value of micro powder wax is only -5.1mV. The heat storage effect is shown to be that all of them float. This shows that the pH of the weakly alkaline double-layer compressor is crucial to the suspension state of wax powder after heat storage in the coating system.

[0183] 2. By comparing the results of Example 1 and Comparative Example 2, the negative charge modification process of wax S2 in Example 1 is also necessary. This process can introduce polar groups such as silanol groups on the surface of wax-based materials, which is beneficial to improving the electronegativity of the wax-based material surface and plays a crucial role in the formation and stability of the double-layer compression system. Moreover, the suspendable micro powder wax has a large Zeta potential value, reaching -40.8mV. In contrast, Comparative Example 2 did not have the negative charge modification process of wax S2, and its corresponding micro powder wax had a Zeta potential value of only -15.2mV. The heat storage effect was that all of them floated. This shows that the negative charge modification of wax has a positive effect on the heat storage and suspension effect of the final suspendable micro powder wax in the coating system.

[0184] 3. By comparing the results of Example 2 and Comparative Example 3, it is clear that the solvation process in S4 of Example 2 is also necessary. The increase in temperature during solvation is beneficial to improving the spread of polar groups such as hydroxyl and carboxyl groups on the surface of the negatively charged modified wax. The decrease in stirring speed is beneficial to improving the compatibility between the negatively charged modified wax and the composite double-layer compressor, so that the suspended micro powder wax forms a relatively stable whole at the microscopic level. Moreover, the zeta potential value of the suspended micro powder wax is relatively large, reaching -41.5mV. In contrast, Comparative Example 3 omitted the solvation process, and its corresponding micro powder wax has a zeta potential value of only -13.6mV. The thermal storage effect is that all of them float. This shows that the solvation process plays an indispensable role in the final thermal storage and suspension stability of the suspended micro powder wax in the coating system.

[0185] 4. By comparing the results of Example 2 with those of Comparative Example 4, it is clear that the use of an aqueous solution of an organic nonionic double-layer compressor M as a masterbatch in the preparation of the S1 composite double-layer compressor powder T in Example 2 is also essential. The use of masterbatch M helps to improve the composite stability of the weakly acidic and weakly alkaline inorganic double-layer compressors in S14, ensuring the uniform distribution of the two components in the composite double-layer compressor powder T in S15. Furthermore, the pH of aqueous solutions A, B, and C does not need to be adjusted by adding external acid / base; it can be achieved through a self-ionization / self-hydrolysis process. pH adjustment, along with the weak alkalinity of the composite double-layer compressor, facilitates the control of the electric layer stability of the micronized wax surface by the double-layer compressor, resulting in a larger Zeta potential value of the suspended micronized wax, reaching -41.5mV. In contrast, Comparative Example 4, which did not use the organic nonionic double-layer compressor aqueous solution M as a masterbatch, had a corresponding Zeta potential value of only -12.1mV, and its thermal storage effect showed complete floating. This indicates that using the organic nonionic double-layer compressor aqueous solution M as a masterbatch plays an indispensable role in the thermal storage and suspension stability of the final suspended micronized wax in the coating system.

[0186] 5. By comparing the results of Example 1 and Example 2, it is not difficult to find that the specific method selected in the surface negative charge modification of wax in Example 2 is also crucial. In Example 2, which uses the polymer alloy method, the suspended micro powder wax has a larger agglomerate after heat storage in the coating system than in Example 1, which uses the composite blending method. This indicates that the polymer alloy method has higher stability of the negative charge on the wax surface compared to the composite modification method, and has a certain influence on the morphology of the suspended micro powder wax in the coating system after heat storage. However, regardless of whether the surface negative charge modified wax is obtained by the polymer alloy method or the composite blending method, it plays an indelible positive role in the final heat storage and suspension stability of the suspended micro powder wax in the coating system.

[0187] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A suspendable micronized wax powder prepared based on the double-layer compression theory, characterized in that, It is prepared by blending composite modified double-layer compressive agent micro powder T with negatively charged modified micro powder wax, and includes: Preparation of S1 Composite Modified Double Layer Compressor: S11 Prepare organic nonionic double layer compressor aqueous solution masterbatch M; S12 Prepare weakly acidic inorganic double layer compressor aqueous solution A using masterbatch M; S13 Prepare weakly alkaline inorganic double layer compressor aqueous solution B using masterbatch M; S14 Mix A and B in proportion to prepare composite modified double layer compressor aqueous solution C; S15 Dry the composite modified double layer compressor aqueous solution C to obtain composite modified double layer compressor micro powder T, wherein the Zeta potential of the composite modified double layer compressor micro powder T is between -20 and -80 mV; S2 negative charge modified micro powder wax preparation: prepared by mixing highly negative charge montmorillonite and / or silica micro powder with micro powder wax, and / or prepared by mixing high acid value polar wax with weak polar and / or non-polar wax in a certain proportion, melting and stirring evenly and spraying out. S3 Suspended Micropowder Wax: Prepared by mixing the composite modified double-layer compressor micropowder T in S1 with the negatively charged modified micropowder wax in S2.

2. The suspendable micronized wax powder prepared based on the double-layer compression theory according to claim 1, characterized in that: It also includes S4 solvation of the suspendable micro powder wax, which involves placing the suspendable micro powder wax in a specific polar solvent, wherein the polar solvent includes one or more of ethylene glycol butyl ether (BCS), propylene glycol methyl ether (PM), dipropylene glycol butyl ether (DPNB), ethanol (EtOH), and dipropylene glycol methyl ether (DPM).

3. A suspendable micronized wax powder prepared based on the double-layer compression theory according to claim 1 or 2, characterized in that: The solute in the aqueous solution M of S11 includes one or more of polyvinylpyrrolidone (PVP), sodium dodecylbenzene sulfonate (SDBS), sodium dodecyl sulfonate (SDS), and polyethylene glycol (PEO). The solute in the weakly acidic inorganic double-layer compressor aqueous solution A in S12 includes one or a combination of several of the following: ferric chloride FeCl3, calcium dihydrogen phosphate Ca(H2PO4)2, aluminum dihydrogen phosphate Al(H2PO4)3, magnesium dihydrogen phosphate Mg(H2PO4)2, sodium dihydrogen citrate KH2C6H5O7, sodium bisulfite NaHSO3, sodium bisulfate NaHSO4, sodium maleate NaHC4H2O4, and potassium hydrogen phthalate KHC8H4O4. The solute in the weakly alkaline inorganic double-layer compressor aqueous solution B in S13 includes one or a combination of several of the following: calcium oxide (CaO), calcium hydroxide (Ca(OH)2), sodium hydroxide (NaOH), sodium carbonate (Na2CO3), sodium bicarbonate (NaHCO3), potassium hydroxide (KOH), potassium carbonate (K2CO3), and potassium bicarbonate (KHCO3).

4. The suspendable micronized wax powder prepared based on the double-layer compression theory according to claim 1, characterized in that: The montmorillonite micro powder in S2 has a Zeta potential of -25 to -35 mV and a D50 of 2.02-6.1 μm, while the silica micro powder has a Zeta potential of -10 to -50 mV and a D50 of 2.35-5.91 μm.

5. The suspendable micronized wax powder prepared based on the double-layer compression theory according to claim 4, characterized in that: The mixing ratio of montmorillonite powder and silica powder is (0-85):(0-70).

6. The suspendable micronized wax powder prepared based on the double-layer compression theory according to claim 1, characterized in that: The surface of the high-acid-value polar wax in S2 is grafted with carboxyl groups and / or hydroxyl groups, and the alloy modification mass ratio of the high-acid-value polar wax to the weakly polar and / or non-polar wax is (10-45):(55-90).

7. The suspendable micronized wax powder prepared based on the double-layer compression theory according to claim 1, characterized in that: The composite modified double-layer compressive agent powder T and the negatively charged modified powder wax in S3 are mixed and modified at a mass ratio of (0.5-15):(85-99.5).

8. The suspendable micronized wax powder prepared based on the double-layer compression theory according to claim 1, characterized in that: In S14, A and B are prepared into a composite modified double-layer compressive agent aqueous solution C at a volume ratio of (45-65):(35-55).

9. The suspendable micronized wax powder prepared based on the double-layer compression theory according to claim 1, characterized in that: The suspended micronized wax has a pH value of 7.8-8.6 and an absolute value of Zeta potential of -30 to -50 mV.

10. A coating comprising a suspendable micronized wax prepared based on the double-layer compression theory as described in any one of claims 1-9.

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