CN115260880B - High-heat-insulation powder coating for aluminum profile and preparation method thereof - Google Patents
High-heat-insulation powder coating for aluminum profile and preparation method thereof Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 70
- 239000011248 coating agent Substances 0.000 title claims abstract description 64
- 239000000843 powder Substances 0.000 title claims abstract description 47
- 238000009413 insulation Methods 0.000 title claims abstract description 31
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title description 7
- 239000011521 glass Substances 0.000 claims abstract description 65
- 239000011324 bead Substances 0.000 claims abstract description 63
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000005282 brightening Methods 0.000 claims abstract description 9
- 229920001225 polyester resin Polymers 0.000 claims abstract description 8
- 239000004645 polyester resin Substances 0.000 claims abstract description 8
- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical compound O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000000945 filler Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims description 23
- 239000000243 solution Substances 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 4
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- -1 polysiloxane Polymers 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000005995 Aluminium silicate Substances 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 235000012211 aluminium silicate Nutrition 0.000 claims description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000010445 mica Substances 0.000 claims description 3
- 229910052618 mica group Inorganic materials 0.000 claims description 3
- 239000004005 microsphere Substances 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 2
- 239000004411 aluminium Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 4
- 229920000728 polyester Polymers 0.000 abstract description 4
- 238000004321 preservation Methods 0.000 abstract description 4
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 6
- 238000000967 suction filtration Methods 0.000 description 6
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Chemical group CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000010451 perlite Substances 0.000 description 3
- 235000019362 perlite Nutrition 0.000 description 3
- 229960000583 acetic acid Drugs 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 125000004185 ester group Chemical group 0.000 description 2
- 239000012362 glacial acetic acid Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000010455 vermiculite Substances 0.000 description 2
- 235000019354 vermiculite Nutrition 0.000 description 2
- 229910052902 vermiculite Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000007590 electrostatic spraying Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a high-heat-insulation powder coating for aluminum profiles, which belongs to the technical field of powder coatings and comprises the following raw materials in parts by weight: 50-60 parts of polyester resin, 20-25 parts of modified hollow glass beads, 18-26 parts of filler, 4-5 parts of triglycidyl isocyanurate, 1.2-1.4 parts of flatting agent and 1.0-1.2 parts of brightening agent. According to the invention, the hollow glass beads are modified, and organic molecular chains are introduced into the surfaces of the hollow glass beads, so that the hollow glass beads are uniformly dispersed in the coating, a layer of cavity particle groups formed by the hollow glass beads are formed in the coating, and the heat insulation property of the coating is improved; the flexible organic molecular chains introduced on the surface of the coating can be inserted between polyester molecular chains to play a role in internal plasticization, so that the toughness of the coating is improved to a certain extent; the obtained powder coating has excellent heat insulation performance and mechanical property, and can play a role in heat insulation and heat preservation when being coated on the surface of the aluminum profile, thereby expanding the application field of the aluminum profile.
Description
Technical Field
The invention belongs to the technical field of powder coatings, and particularly relates to a high-heat-insulation powder coating for aluminum profiles and a preparation method thereof.
Background
The powder coating has the characteristics of resource saving, energy saving, pollution-free, high labor productivity, convenient realization of automatic coating and the like, is now a well-known ecological environment-friendly, high-production-efficiency, excellent coating performance and economic coating product, has the fastest development speed in various coating varieties, and provides space for development of a plurality of functional coatings. Powder coatings are widely used for surface coating of metal materials, and because metals have good heat conductivity, the requirements of heat preservation performance and heat insulation performance of general metal workpieces are difficult to achieve through powder coating, which limits the application of the powder coatings in some specific fields.
In order to improve the heat insulation performance of the powder coating, the prior art mostly adopts the modes of using expanded perlite, hollow glass beads and the like in the coating raw materials. For example, the Chinese patent application No. 201110392261.9 discloses a heat-insulating powder coating for aluminum alloy profiles and a preparation method thereof. The coating comprises the following components in percentage by mass: 48-58 g of film forming agent, 3.6-4.3 g of curing agent, 1.0g of leveling agent, 1.0g of brightening agent, 0.2 g of degasifying agent, 20-30 g of heat insulating component and 16-36 g of filler, wherein the heat insulating component is one or a combination of expanded vermiculite and expanded perlite. Because the heat-insulating components (expanded vermiculite, expanded perlite or hollow glass beads) are all inorganic materials, the heat-insulating components have poor compatibility with a film-forming matrix (polymer) of the powder coating, and uniform dispersion is difficult to realize, so that the improvement effect of the heat-insulating properties of the powder coating by the materials is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a high-heat-insulation powder coating for aluminum profiles and a preparation method thereof.
According to the invention, the hollow glass beads are modified, and the organic molecular chains are introduced into the surfaces of the hollow glass beads, so that the hollow glass beads can be uniformly dispersed in the powder coating, a layer of cavity particle groups formed by the hollow glass beads can be formed in the coating, and the heat insulation property of the coating can be improved; the flexible organic molecular chains introduced on the surface of the coating can be inserted between polyester molecular chains to play a role in internal plasticization, so that the toughness of the coating is improved to a certain extent; the obtained powder coating has excellent heat insulation performance and mechanical property, and can play a role in heat insulation and heat preservation when being coated on the surface of the aluminum profile, thereby expanding the application field of the aluminum profile.
The aim of the invention can be achieved by the following technical scheme:
the high heat insulation powder coating for the aluminum profile comprises the following raw materials in parts by weight: 50-60 parts of polyester resin, 20-25 parts of modified hollow glass beads, 18-26 parts of filler, 4-5 parts of triglycidyl isocyanurate, 1.2-1.4 parts of flatting agent and 1.0-1.2 parts of brightening agent.
Further, the leveling agent is one or the combination of a plurality of polyacrylate, polysiloxane and silicon-containing acrylate according to any proportion.
Further, the brightening agent is a copolymer of butyl acrylate and methyl methacrylate.
Further, the filler is one or the combination of a plurality of mica powder, titanium dioxide, kaolin, barium sulfate, diatomite and talcum powder according to any proportion.
The preparation method of the high heat insulation powder coating for the aluminum profile comprises the following steps:
adding the raw materials into a high-speed mixer according to the weight ratio, mixing for 12-15min to fully and uniformly mix the components, feeding the uniformly mixed materials into a double-screw mixing extruder, mixing and extruding, cooling to room temperature through a cold roller tablet after discharging, and sieving with a 200-mesh sieve after high-speed crushing to obtain the heat-insulating powder coating.
Further, the modified hollow glass microsphere is prepared by the following steps:
s1, uniformly mixing hollow glass bead powder and NaOH solution (the mass fraction is 40%) according to a solid-to-liquid ratio of 1g to 15mL, stirring for 90min in a water bath kettle at 80 ℃, after cooling the mixed solution, carrying out suction filtration, washing with absolute ethyl alcohol and deionized water for 4-5 times in sequence, and fully drying to obtain pretreated glass beads;
through the treatment of alkali liquor (NaOH solution), more-OH is formed on the surfaces of the hollow glass beads, so that more reaction sites are provided for subsequent surface grafting modification;
s2, dissolving a silane coupling agent KH560 by using an ethanol water solution with the mass fraction of 90%, preparing a solution with the mass fraction of 0.01g/mL, regulating the pH value to 5.0, adding the pretreated glass beads into the solution according to the solid-to-liquid ratio of 1g:20mL under low-speed stirring, stirring for 30-40min, carrying out suction filtration, washing for 4-5 times by using absolute ethanol and deionized water in sequence, and fully drying to obtain the pre-modified glass beads;
under the treatment of a silane coupling agent KH560, one end of siloxane of the coupling agent is grafted on the surface of the hollow glass bead through-OH combination on the surface of the hollow glass bead, so that the silane coupling agent is introduced on the surface of the hollow glass beadA chain group;
s3, mixing the pre-modified glass beads, butyric acid and DMF (dimethyl formamide) into a three-neck flask, stirring and reacting for 8 hours under the oil bath condition of 110 ℃, cooling, filtering, washing for 4-5 times by using absolute ethyl alcohol and deionized water in sequence, and fully drying to obtain modified hollow glass beads; the dosage ratio of the pre-modified glass beads, the butyric acid and the DMF is 1g to 0.1g to 30mL;
the epoxy groups on the surfaces of the hollow glass beads react with-COOH on butyric acid molecules in a ring opening way to generateA chain group;
after the hollow glass beads are modified, organic chain groups are introduced into the surfaces, so that the compatibility of the hollow glass beads with a polyester resin matrix can be effectively improved, and the organic chain groups contain groups such as ester groups, ether bonds and the like, have similar polarity mutual dissolution with the ester groups of the polyester resin, and can promote the uniform dispersion of the hollow glass beads; the hollow glass beads have the characteristics of high compressive strength, high melting point, high resistivity, small thermal conductivity coefficient, small thermal contraction coefficient and the like, and the hollow glass beads uniformly dispersed in the coating are beneficial to forming a layer of cavity particle groups formed by the hollow beads in the coating film, so that the heat insulation property of the coating film is improved, the fluidity of the coating film is improved, and the chemical inertia property of the coating film can improve the chemical resistance and the flame retardance of the coating film;
in addition, the organic chain group grafted on the surface of the hollow glass microsphere is a longer flexible chain, and the ether linkage in the organic chain group is easier to rotate, so that the flexibility of the chain can be further increased, the flexible chain can be inserted between polyester molecular chains, the internal plasticization effect is achieved, and the toughness of a coating film is further improved to a certain extent.
The invention has the beneficial effects that:
according to the invention, the hollow glass beads are modified, and the organic molecular chains are introduced into the surfaces of the hollow glass beads, so that the hollow glass beads can be uniformly dispersed in the powder coating, a layer of cavity particle groups formed by the hollow glass beads can be formed in the coating, and the heat insulation property of the coating can be improved; the flexible organic molecular chains introduced on the surface of the coating can be inserted between polyester molecular chains to play a role in internal plasticization, so that the toughness of the coating is improved to a certain extent; the obtained powder coating has excellent heat insulation performance and mechanical property, and can play a role in heat insulation and heat preservation when being coated on the surface of the aluminum profile, thereby expanding the application field of the aluminum profile.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Preparing modified hollow glass beads:
s1, uniformly mixing 10g of hollow glass bead powder with 150mL of NaOH solution (the mass fraction is 40%), stirring for 90min in a water bath kettle at 80 ℃, after the mixed solution is cooled, carrying out suction filtration, washing with absolute ethyl alcohol and deionized water for 4 times in sequence, and fully drying to obtain pretreated glass beads;
s2, dissolving a silane coupling agent KH560 by using an ethanol water solution with the mass fraction of 90%, preparing a solution with the mass fraction of 0.01g/mL, regulating the pH value to 5.0 by using glacial acetic acid, adding 10g of the pretreated glass beads into 200mL of the solution under low-speed stirring, stirring for 30min, carrying out suction filtration, washing with absolute ethanol and deionized water for 4 times in sequence, and fully drying to obtain the pre-modified glass beads;
s3, mixing 10g of the pre-modified glass beads, 1g of butyric acid and 300mL of DMF (dimethyl formamide) into a three-necked flask, stirring and reacting for 8 hours at the temperature of 110 ℃, cooling, filtering, washing for 4 times with absolute ethyl alcohol and deionized water in sequence, and fully drying to obtain the modified hollow glass beads.
Example 2
Preparing modified hollow glass beads:
s1, uniformly mixing 20g of hollow glass bead powder with 300mL of NaOH solution (the mass fraction is 40%), stirring for 90min in a water bath at 80 ℃, after the mixed solution is cooled, carrying out suction filtration, washing with absolute ethyl alcohol and deionized water for 5 times in sequence, and fully drying to obtain pretreated glass beads;
s2, dissolving a silane coupling agent KH560 by using an ethanol water solution with the mass fraction of 90%, preparing a solution with the mass fraction of 0.01g/mL, regulating the pH value to 5.0 by using glacial acetic acid, adding 20g of the pretreated glass beads into 400mL of the solution under low-speed stirring, stirring for 40min, carrying out suction filtration, washing for 5 times by using absolute ethanol and deionized water in sequence, and fully drying to obtain the pre-modified glass beads;
s3, mixing 20g of the pre-modified glass beads, 2g of butyric acid and 600mL of DMF (dimethyl formamide) into a three-necked flask, stirring and reacting for 8 hours at the temperature of 110 ℃, cooling, filtering, washing for 5 times with absolute ethyl alcohol and deionized water in sequence, and fully drying to obtain the modified hollow glass beads.
Example 3
The high heat insulation powder coating for the aluminum profile comprises the following raw materials: 50g of polyester resin, 20g of modified hollow glass beads prepared in example 1, 18g of mica powder, 4g of triglycidyl isocyanurate, 1.2g of polyacrylate and 1.0g of brightening agent;
adding the raw materials into a high-speed mixer according to the weight ratio, mixing for 12min to fully and uniformly mix the components, feeding the uniformly mixed materials into a double-screw mixing extruder, mixing and extruding, cooling to room temperature through a cold roller tablet after discharging, and sieving with a 200-mesh sieve after high-speed crushing to obtain the heat-insulating powder coating.
Example 4
The high heat insulation powder coating for the aluminum profile comprises the following raw materials: 55g of polyester resin, 23g of modified hollow glass beads prepared in example 2, 22g of titanium dioxide, 4.5g of triglycidyl isocyanurate, 1.3g of polysiloxane and 1.1g of brightening agent;
adding the raw materials into a high-speed mixer according to the weight ratio, mixing for 14min to fully and uniformly mix the components, feeding the uniformly mixed materials into a double-screw mixing extruder, mixing and extruding, cooling to room temperature through a cold roller tablet after discharging, and sieving with a 200-mesh sieve after high-speed crushing to obtain the heat-insulating powder coating.
Example 5
The high heat insulation powder coating for the aluminum profile comprises the following raw materials: 60g of polyester resin, 25g of modified hollow glass beads prepared in example 1, 26g of kaolin, 5g of triglycidyl isocyanurate, 1.4g of silicon-containing acrylic ester and 1.2g of brightening agent;
adding the raw materials into a high-speed mixer according to the weight ratio, mixing for 15min to fully and uniformly mix the components, feeding the uniformly mixed materials into a double-screw mixing extruder, mixing and extruding, cooling to room temperature through a cold roller tablet after discharging, and sieving with a 200-mesh sieve after high-speed crushing to obtain the heat-insulating powder coating.
Comparative example
The modified hollow glass beads in example 3 were replaced with ordinary hollow glass beads, and the rest of the raw materials and the preparation process were unchanged.
The powder coatings obtained in examples 3 to 5 and comparative example were applied to the surface of a metal plate subjected to degreasing and rust removal by electrostatic spraying, and then baked and cured in an oven at 200 ℃ for 10 minutes to form a coating, and the following performance test was performed:
impact resistance was tested according to GB/T1732-1993; adhesion (cross-hatch): according to GB/T9286-1998; testing the thermal conductivity of the coating film;
the results are shown in the following table:
| example 3 | Example 4 | Example 5 | Comparative example | |
| Impact (50 cm) | Pass through in the opposite direction | Pass through in the opposite direction | Pass through in the opposite direction | Positive and negative fracture |
| Adhesion/grade | 0 | 0 | 0 | 1 |
| Thermal conductivity/W.K -1 ·m -1 | 0.122 | 0.121 | 0.122 | 0.133 |
As can be seen from the data in the table, the powder coating prepared by the invention has higher toughness and higher heat insulation performance (the lower the heat conductivity is, the better the heat insulation performance is), and the adhesive force can also meet the use requirement of the powder coating; according to the data of the comparative example, after the hollow glass beads are modified, the hollow glass beads can be uniformly dispersed, so that the heat insulation effect can be better exerted, and the toughening effect can be achieved to a certain extent.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.
Claims (7)
1. The high heat insulation powder coating for the aluminum profile is characterized by comprising the following raw materials in parts by weight: 50-60 parts of polyester resin, 20-25 parts of modified hollow glass beads, 18-26 parts of filler, 4-5 parts of triglycidyl isocyanurate, 1.2-1.4 parts of flatting agent and 1.0-1.2 parts of brightening agent; wherein, the modified hollow glass bead is prepared by the following steps:
s1, uniformly mixing hollow glass bead powder and NaOH solution according to a solid-to-liquid ratio of 1g to 15mL, stirring for 90min in a water bath kettle at 80 ℃, and after cooling the mixed solution, performing post-treatment to obtain pretreated glass beads;
s2, dissolving a silane coupling agent KH560 by using an ethanol water solution with the mass fraction of 90%, preparing a solution with the mass fraction of 0.01g/mL, regulating the pH value to 5.0, adding the pretreated glass beads into the solution according to the solid-to-liquid ratio of 1g:20mL under low-speed stirring, stirring for 30-40min, and performing post-treatment to obtain the pre-modified glass beads;
s3, mixing the pre-modified glass beads, butyric acid and DMF, adding the mixture into a three-neck flask, stirring the mixture for reaction for 8 hours at the temperature of 110 ℃ under the condition of oil bath, cooling, and carrying out aftertreatment to obtain modified hollow glass beads;
the surface of the modified hollow glass microsphere is introduced with the following chain groups:
。
2. a high heat insulating powder coating for aluminium profiles according to claim 1, characterized in that the NaOH solution in step S1 has a mass fraction of 40%.
3. The high heat-insulating powder coating for aluminum profiles according to claim 1, wherein the post-treatment process is: filtering, washing with absolute ethanol and deionized water for 4-5 times, and drying.
4. The high heat insulation powder coating for aluminum profiles according to claim 1, wherein the leveling agent is one or a combination of a plurality of polyacrylate, polysiloxane and silicon-containing acrylate according to any proportion.
5. The high heat insulation powder coating for aluminum profiles according to claim 1, wherein the brightening agent is a copolymer of butyl acrylate and methyl methacrylate.
6. The high heat insulation powder coating for aluminum profiles according to claim 1, wherein the filler is one or a combination of a plurality of mica powder, titanium dioxide, kaolin, barium sulfate, diatomite and talcum powder according to any proportion.
7. The method for preparing the high heat insulation powder coating for the aluminum profile according to claim 1, which is characterized by comprising the following specific steps:
adding the raw materials into a high-speed mixer according to the weight ratio, mixing for 12-15min to fully and uniformly mix the components, feeding the uniformly mixed materials into a double-screw mixing extruder, mixing and extruding, cooling to room temperature through a cold roller tablet after discharging, and sieving with a 200-mesh sieve after high-speed crushing to obtain the high-heat-insulation powder coating.
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Denomination of invention: A high insulation powder coating for aluminum profiles and its preparation method Granted publication date: 20230908 Pledgee: China Construction Bank Co.,Ltd. Anqing Chengzhong Branch Pledgor: Anhui dengwang Chemical Co.,Ltd. Registration number: Y2024980014784 |