CN115725215A - Powder coating easy to demould and preparation method and application thereof - Google Patents
Powder coating easy to demould and preparation method and application thereof Download PDFInfo
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- CN115725215A CN115725215A CN202211392230.8A CN202211392230A CN115725215A CN 115725215 A CN115725215 A CN 115725215A CN 202211392230 A CN202211392230 A CN 202211392230A CN 115725215 A CN115725215 A CN 115725215A
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- curing agent
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- 238000000576 coating method Methods 0.000 title claims abstract description 98
- 239000011248 coating agent Substances 0.000 title claims abstract description 95
- 239000000843 powder Substances 0.000 title claims abstract description 81
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 45
- 239000011347 resin Substances 0.000 claims abstract description 36
- 229920005989 resin Polymers 0.000 claims abstract description 36
- 239000011159 matrix material Substances 0.000 claims abstract description 26
- 239000010453 quartz Substances 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 13
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 13
- 239000000945 filler Substances 0.000 claims abstract description 13
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 claims abstract description 11
- 150000007519 polyprotic acids Polymers 0.000 claims abstract description 6
- 239000000178 monomer Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 12
- 230000002209 hydrophobic effect Effects 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 10
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 claims description 8
- 239000004611 light stabiliser Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000003999 initiator Substances 0.000 claims description 7
- 150000003254 radicals Chemical class 0.000 claims description 7
- 239000004593 Epoxy Substances 0.000 claims description 6
- 239000004566 building material Substances 0.000 claims description 6
- 239000012986 chain transfer agent Substances 0.000 claims description 6
- 230000009477 glass transition Effects 0.000 claims description 6
- 239000002518 antifoaming agent Substances 0.000 claims description 4
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical group CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 claims description 4
- 239000006096 absorbing agent Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- RUMACXVDVNRZJZ-UHFFFAOYSA-N 2-methylpropyl 2-methylprop-2-enoate Chemical compound CC(C)COC(=O)C(C)=C RUMACXVDVNRZJZ-UHFFFAOYSA-N 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
- 238000010528 free radical solution polymerization reaction Methods 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 description 28
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 28
- 238000012360 testing method Methods 0.000 description 14
- 238000001125 extrusion Methods 0.000 description 11
- 239000002245 particle Substances 0.000 description 9
- -1 silicon modified acrylate Chemical class 0.000 description 9
- 239000003513 alkali Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical group C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 229910052724 xenon Inorganic materials 0.000 description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 244000028419 Styrax benzoin Species 0.000 description 3
- 235000000126 Styrax benzoin Nutrition 0.000 description 3
- 235000008411 Sumatra benzointree Nutrition 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 3
- 229960002130 benzoin Drugs 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 235000019382 gum benzoic Nutrition 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical group C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 2
- 239000012965 benzophenone Substances 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- WQAQPCDUOCURKW-UHFFFAOYSA-N butanethiol Chemical compound CCCCS WQAQPCDUOCURKW-UHFFFAOYSA-N 0.000 description 2
- 239000008199 coating composition Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- TVIDDXQYHWJXFK-UHFFFAOYSA-N dodecanedioic acid Chemical group OC(=O)CCCCCCCCCCC(O)=O TVIDDXQYHWJXFK-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000398 iron phosphate Inorganic materials 0.000 description 2
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 2
- 238000005058 metal casting Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000003678 scratch resistant effect Effects 0.000 description 2
- 238000006748 scratching Methods 0.000 description 2
- 230000002393 scratching effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 2
- 229910000165 zinc phosphate Inorganic materials 0.000 description 2
- 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 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- WMRCTEPOPAZMMN-UHFFFAOYSA-N 2-undecylpropanedioic acid Chemical compound CCCCCCCCCCCC(C(O)=O)C(O)=O WMRCTEPOPAZMMN-UHFFFAOYSA-N 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- 241000735527 Eupatorium Species 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 210000004877 mucosa Anatomy 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- VYMDGNCVAMGZFE-UHFFFAOYSA-N phenylbutazonum Chemical compound O=C1C(CCCC)C(=O)N(C=2C=CC=CC=2)N1C1=CC=CC=C1 VYMDGNCVAMGZFE-UHFFFAOYSA-N 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000003075 superhydrophobic effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- WMXCDAVJEZZYLT-UHFFFAOYSA-N tert-butylthiol Chemical compound CC(C)(C)S WMXCDAVJEZZYLT-UHFFFAOYSA-N 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Paints Or Removers (AREA)
Abstract
The invention belongs to the technical field of coatings, and provides an easily demoulded powder coating, a preparation method and application thereof, wherein the powder coating is prepared by mainly adopting modified matrix resin, a curing agent and a hardening filler, glycidyl acrylic resin is used as the modified matrix resin to prepare an acrylic system coating together with a polybasic acid curing agent, and porous powdered quartz is added as the hardening filler, so that the improvement of the adhesive force, the caking property, the hardness and the impact resistance of a coating film is facilitated.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to an easy-to-demould powder coating and a preparation method and application thereof.
Background
The aluminum template is widely applied to modern building construction projects, such as concrete projects. In order to control the cost, the aluminum template needs to be repeatedly used until the whole building is finished, and then the aluminum template is recycled. In order to protect the aluminum template and increase the number of times the aluminum template is used in a single project, a small amount of powder coating is generally sprayed on the surface of the aluminum template to achieve a protective effect. However, the powder coating used in the current market has poor performance, has the problems of poor weather resistance, low hardness, water resistance, corrosion resistance, unsmooth surface, difficult cleaning of concrete adhesion and the like, and can fall off after being used for 2 to 3 times, so that the protection effect of the powder coating on an aluminum template is very limited. In the existing treatment mode, a layer of release agent is brushed on the surface of a coating film before use in order to better release the coating film, so that concrete mucosa is prevented. At present, the aluminum template release agent is mainly a water-based or oil-based liquid release agent, but needs to be brushed for multiple times, the film forming time needs 5-8 hours, and the brushing condition requirements are extremely high (the thickness and the uniformity need to be noticed in the brushing process, the height of the brushed board surface is kept in a horizontal state, otherwise, the release agent is easy to flow and fall down), so the aluminum template release agent is limited by small construction space and cross operation, and the film forming effect is difficult to ensure. Besides, the large use of the release agent affects the project progress, and also causes certain harm to the health of field construction personnel.
Therefore, there is a need to develop a powder coating, which has the properties of super weather resistance, easy demoulding (i.e. concrete is not easy to adhere to the coating), good alkali resistance and high hardness, does not need to be coated with a release agent, is not easy to fall off from an aluminum template in the using process, is suitable for metal materials, especially meets the special requirements of protection of the aluminum template (super weather resistance, good alkali resistance, high hardness and the like), improves the progress of engineering and ensures the personal health of field constructors.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. The coating prepared from the powder coating has the characteristic of easy demoulding, is easy to separate from concrete, can pour the concrete for 46 times in a concrete demoulding test, is not easy to fall off from an aluminum template in the using process, has strong hydrophobicity, has a light retention rate of not less than 78 percent in a xenon lamp aging 2000H test, has the hardness of 4-5H, passes through the front side of 80kg.cm in an impact strength test, simultaneously has excellent weather resistance, alkali resistance, high hardness and high impact strength, can be used as the powder coating special for the aluminum template, meets the special requirement of aluminum template protection, greatly prolongs the service life of the aluminum template, and can avoid using a large amount of release agents which pollute the environment.
In a first aspect of the invention, an easily demoulded powder coating is provided.
Specifically, the powder coating easy to demould comprises the following components:
modified matrix resin, curing agent and hardening filler;
the modified matrix resin is glycidyl acrylic resin;
the curing agent is a polybasic acid curing agent;
the hardening filler is porous powder quartz.
The invention adopts glycidyl acrylic resin as main resin, has the characteristics of strong hydrophobicity and high hardness, can be cured with polybasic acid curing agent to prepare a coating film, and is added with porous powder quartz as a hardening filler, because the surface of the porous powder quartz contains hydroxyl as a polar functional group, the porous powder quartz is used in powder coating, which is beneficial to improving the adhesive force and the cohesiveness of the coating film and preventing the coating film from falling off in the using process, and simultaneously, the porous powder quartz contains zirconium dioxide, which has stable property and high hardness, and has a porous structure, so that the coating film has the characteristic of good hardness and the impact resistance of the coating film can be improved.
Preferably, the particle size of the porous powdered quartz is 4-6 μm.
Preferably, the pore diameter of the porous powder quartz is 5-10nm.
More preferably, the pore size of the porous powdered quartz is 8.8-10nm.
Further preferably, the pore diameter of the porous powdered quartz is 8.8nm.
Preferably, the raw materials for preparing the glycidyl acrylic resin comprise the following components: hydrophobic hard monomer, functional monomer, free radical initiator, chain transfer agent and solvent; the hydrophobic hard monomer is one or more of methyl methacrylate, butyl methacrylate, n-butyl methacrylate and isobutyl methacrylate; the functional monomer is glycidyl methacrylate.
Preferably, the raw materials for preparing the glycidyl acrylic resin comprise the following components in parts by weight:
preferably, the free radical initiator is one or more of azobisisobutyronitrile, di-tert-butyl peroxide and tert-butyl hydroperoxide.
Preferably, the chain transfer agent is one or more of n-butyl mercaptan, tert-butyl mercaptan and n-dodecyl mercaptan.
Preferably, the solvent is one or more of toluene, xylene or cyclohexane.
Preferably, the powder coating comprises the following components in parts by weight:
50-60 parts of modified matrix resin
10-15 parts of curing agent
25-40 parts of hardening filler.
More preferably, the powder coating comprises the following components in parts by weight:
55-60 parts of modified matrix resin
11-15 parts of curing agent
30-40 parts of hardening filler.
Preferably, the modified matrix resin has an epoxy equivalent of 750 to 890eq/100g.
Preferably, the glass transition temperature (Tg) of the modified matrix resin is 72-85 ℃. The modified matrix resin is a strong-hydrophobic high-hardness acrylic resin, has higher glass transition temperature and epoxy equivalent, and is subjected to curing reaction with polybasic acid to prepare a coating, so that the coating has the characteristics of high hardness, good weather resistance and strong hydrophobicity, and the hydrophobic angle of the coating can reach about 110 degrees.
Preferably, the weight ratio of the modified base resin to the curing agent is (3.
More preferably, the weight ratio of the modified base resin to the curing agent is (4.
Preferably, the curing agent is dodecanedioic acid.
Preferably, the powder coating further comprises a leveling agent, a hardening and scratching resistant agent, a defoaming agent, an ultraviolet absorber and a light stabilizer.
More preferably, the powder coating comprises the following components in parts by weight:
preferably, the leveling agent is an organic silicon modified acrylate leveling agent.
Preferably, the antifoaming agent is benzoin (benzoin).
Preferably, the hardening and scratch-resistant agent is polytetrafluoroethylene modified polyethylene wax. The polytetrafluoroethylene modified polyethylene wax is a hardening scratch-resistant super-hydrophobic wax powder.
Preferably, the ultraviolet absorber is a benzophenone-based ultraviolet absorber.
Preferably, the light stabilizer is a hindered amine derivative.
Preferably, the powder coating is a powder coating special for an aluminum template.
The second aspect of the invention provides a preparation method of the powder coating easy to demould.
A preparation method of an easy-demoulding powder coating comprises the following steps:
mixing the components, crushing, extruding, tabletting, cooling and crushing to obtain the powder coating.
Preferably, the extrusion is performed using a twin screw extruder.
Preferably, the temperature of the extrusion comprises an extrusion temperature first zone and an extrusion temperature second zone.
Preferably, the extrusion temperature zone one is 80 to 100 ℃.
More preferably, the extrusion temperature zone one is 85-95 ℃.
Preferably, the second extrusion temperature zone is 80-120 ℃.
More preferably, the second extrusion temperature zone is 95 to 115 ℃.
Preferably, the total time of mixing and crushing is 1 to 15 minutes.
More preferably, the total time of mixing and disruption is from 5 to 15 minutes.
Further preferably, the total time of mixing and crushing is 5-10 minutes.
Preferably, the step of sieving is further included after the crushing.
Preferably, the powder particle size of the screened powder coating is 1-100 μm.
More preferably, the powder particle size of the powder coating after screening is 1-80 μm.
More preferably, the powder particle size of the powder coating after screening is 25-60 μm.
The particle diameter of the powder is the equivalent particle diameter D of the powder 50 。
Preferably, the preparation method of the modified matrix resin comprises the following steps:
mixing hydrophobic hard monomers and functional monomers, then adding a free radical initiator, a chain transfer agent and a solvent, and carrying out solution polymerization reaction to obtain the modified matrix resin.
Preferably, the polymerization reaction is carried out in an inert atmosphere.
Preferably, the inert atmosphere is a nitrogen atmosphere.
Preferably, the polymerization temperature is from 109 to 112 ℃.
In a third aspect, the invention provides the use of an easily demoulded powder coating.
An application of an easily demoulded powder coating in the field of building material coating.
Preferably, the method comprises the following steps:
and spraying the powder coating on the surface of the building material, and curing to obtain a coating film.
Preferably, the spraying is performed by a high-voltage electrostatic spray gun.
Preferably, the surface of the building material is subjected to a cleaning pretreatment before the spraying.
Preferably, the cleaning pretreatment is a pretreatment using zinc phosphate or iron phosphate.
Preferably, the thickness of the sprayed matte transparent powder coating for skin feeling is 70-160 μm.
More preferably, the thickness of the matte transparent powder coating after spraying is 100-140 μm.
Preferably, the temperature of the curing is 170-190 ℃.
More preferably, the temperature of the curing is 180-190 ℃.
Preferably, the curing time is 10 to 20 minutes.
Preferably, a curing oven is used for curing.
Preferably, the building material is a metal casting.
Preferably, the metal casting is an aluminum die plate.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention mainly adopts modified matrix resin, curing agent and hardening filler to prepare powder coating, utilize glycidyl acrylic resin as modified matrix resin, make acrylic acid system coating with polybasic acid type curing agent, all superior to polyester system in all aspects such as weather resistance, alkali resistance, hydrophobicity, etc., add porous powder quartz as hardening filler at the same time, help to improve the adhesive force, cohesiveness, hardness and impact resistance of the coating, the coating prepared of powder coating of the invention is apt to disengage with concrete, it has easy demold characteristic, difficult to drop from the aluminum template in the course of using, in the concrete demold test, pour the number of times of concrete at least more than 30, can be up to 46 times, xenon lamp aging 2000H test, the gloss retention is not lower than 78%, the hardness can reach 4-5H, in the impact strength test, 80kg.cm front passes, have the characteristics of ultra-weather resistance, high alkali resistance, high hardness, high impact strength;
(2) According to the characteristics of the acrylic system coating, the organic silicon modified acrylate leveling agent, the ultraviolet absorbent and the light stabilizer are added, so that the performances of weather resistance, easy demoulding performance and the like of a coating film are improved;
(3) The powder coating easy to release provided by the invention can be used in the coating engineering of building materials, for example, in the protection of aluminum templates, the coating can be easily separated from concrete without additionally spraying a release agent, and the coating is not easy to fall off from the aluminum templates, so that the process of engineering is improved, and the personal health of site operators is ensured.
Detailed Description
In order to make the technical solutions of the present invention more clearly apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are not intended to limit the scope of the claimed invention.
The starting materials, reagents or apparatuses used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.
"powder coating" means a powder coating composition, and "powder coating film" means a coating film formed from the powder coating composition.
The following examples and comparative examples use the following raw materials and equipment:
a double-screw extruder: JFY-30 crawler-type double-screw extruder.
Curing agent: dodecanedicarboxylic acid, manufactured by ARKEMA, under the trademark OLERIS;
hardening filler: porous powder quartz, manufacturer Eupatorium, model YQ-H;
leveling agent: an organic silicon modified acrylate leveling agent, manufactured by Bike chemical, model number BYK-306;
hardening and scratching-resistant agent: polytetrafluoroethylene modified polyethylene wax, a new material science and technology company Limited, manufactured by Tianshi, of manufacturer, type PEW-0601;
defoaming agent: BENZOIN, manufacturer MIWON benzone;
ultraviolet absorber: benzophenone ultraviolet absorbers, model LESORB BP12, available from Shanghai Lier New Material science and technology Co., ltd;
light stabilizer: hindered amine derivatives, model LESORB 5144, available from Shanghai Lier New Material science and technology Ltd;
functional monomer: glycidyl methacrylate.
Example 1
The powder coating easy to demould comprises the following components in parts by weight:
the raw materials for preparing the modified matrix resin comprise the following components in parts by weight:
the preparation method of the easy-demoulding powder coating comprises the following steps:
1. preparation of modified matrix resins
(1) Uniformly mixing glycidyl methacrylate and a hydrophobic hard monomer according to the formula amount to obtain a monomer mixture, and dissolving a free radical initiator and a chain transfer agent according to the formula amount of 90% in the monomer mixture;
(2) Slowly dripping the mixture into a refluxing solvent under the condition of strong stirring, introducing nitrogen, properly adjusting the monomer adding speed to keep the refluxing temperature within the range of 110 ℃, after the monomer is added, carrying out heat preservation reaction for 1h, then supplementing 10 percent of free radical initiator according to the formula amount, and carrying out heat preservation reaction for 3.5h until the conversion rate reaches over 95 percent;
(3) Evaporating the solvent from the resin solution obtained by the reaction, thickening the copolymer solution along with the removal of the solvent, increasing the vacuum degree until the content of the solvent in the copolymer is lower than 3%, and releasing the resin while the solvent is hot to finally obtain a modified matrix resin (namely, glycidyl acrylic resin), wherein the epoxy equivalent of the resin is as follows: 850eq/100g, glass transition temperature Tg: and (2) 82 ℃.
2. Preparation of easily demoulded powder coating
The preparation method of the powder coating comprises the following steps:
(1) Weighing the raw material components according to the proportion, placing the raw material components in a mixing cylinder, fully mixing and crushing the raw material components for 8 minutes to obtain a mixed premixed material;
(2) Feeding the mixed premixed material into a JFY-30 crawler-type double-screw extruder for extrusion, wherein the first extrusion temperature is 85 ℃ and the second extrusion temperature is 115 ℃;
(3) And tabletting the extruded material by a tabletting machine, cooling, crushing, screening and packaging, wherein the particle size of the powder crushed and screened by the crusher is 43 mu m.
Example 2
The powder coating easy to demould comprises the following components in parts by weight:
the modified matrix resin comprises the following components in parts by weight:
the preparation method of the easy-demoulding powder coating comprises the following steps:
1. preparation of modified matrix resin, as in example 1, to finally obtain a strongly hydrophobic, high hardness glycidyl acrylic resin, epoxy equivalent of resin: 833eq/100g, glass transition temperature Tg:73 ℃;
2. an easily releasable powder coating was prepared in the same manner as in example 1, and the particle size of the powder after pulverization and sieving by a pulverizer was 45 μm.
Example 3
The powder coating easy to demould comprises the following components in parts by weight:
the modified matrix resin comprises the following components in parts by weight:
the preparation method of the easy-demoulding powder coating comprises the following steps:
1. preparation of modified matrix resin in the same manner as in example 1, a strongly hydrophobic, highly hard glycidyl acrylic resin was finally obtained, the epoxy equivalent of the resin: 855eq/100g, glass transition temperature Tg:77 ℃;
2. an easily releasable powder coating was prepared in the same manner as in example 1, and the particle size of the powder after pulverization and sieving by a pulverizer was 44 μm.
Example 4
The difference from example 1 is that the silicone-modified acrylate leveling agent was replaced with an equal part by weight of acrylate leveling agent.
Example 5
The difference from example 1 is that no UV absorber or light stabilizer is added.
Comparative examples 1 to 4
The components of the powder coatings of comparative examples 1-4 and the amounts thereof are shown in table 1 below:
TABLE 1 Components in proportions and amounts thereof (parts by weight)
Application example
Pretreating the aluminum template by using zinc phosphate or iron phosphate, coating the aluminum template on the substrate of the aluminum template with the surface treated by using a high-voltage electrostatic spray gun, curing the aluminum template for 20 minutes at the curing temperature of 180 ℃ and the thickness of 110 mu m to obtain a coating film, and curing the aluminum template by using a curing furnace.
Product effectiveness testing
TABLE 2 results of the performance test of each example and comparative example
According to the test results, the powder coating is sprayed on an aluminum template to form a coating, a concrete demolding test is carried out, the number of times of circularly pouring concrete in a single test is at least more than 30, even the coating can fall off after reaching 46 times, the coating is not easy to fall off from the aluminum template in the using process, and is easy to separate from the concrete and not sticky, the coating has low surface tension and strong hydrophobicity which are easy to separate from the concrete, the light retention rate is not less than 78% in a xenon lamp aging 2000H test, the coating passes through the 80kg.cm front surface in an impact strength test, the hardness can reach 4-5H, and the coating has the characteristics of excellent weather resistance, alkali resistance, high hardness and high impact strength and can meet the special requirements of aluminum template protection. Wherein, the organosilicon modified acrylate leveling agent is replaced by the acrylate leveling agent with the same weight part, the performance is slightly reduced in the demolding test, and the ultraviolet absorber and the light stabilizer are not added in the example 5, the light retention rate is slightly reduced, which shows that the addition of the organosilicon modified acrylate leveling agent, the ultraviolet absorber and the light stabilizer is helpful for improving the demolding performance and the weather resistance of the powder coating.
In contrast, in comparative examples 1 and 2, the powder coating is prepared from the polyester resin and the triglycidyl isocyanurate curing agent, and in a xenon lamp aging test of 2000h, the light retention rate is seriously reduced, the weather resistance is poor, the hardness is low, the alkali resistance is poor, and the powder coating is easy to fall off in the using process. Comparative example 3 using barium sulfate instead of porous powdered quartz and comparative example 4 using a general acrylic resin all resulted in a decrease in coating film hardness.
Claims (10)
1. A powder coating is characterized by comprising the following components:
modified matrix resin, curing agent and hardening filler;
the modified matrix resin is glycidyl acrylic resin;
the curing agent is polybasic acid curing agent.
The hardening filler is porous powder quartz.
2. The powder coating according to claim 1, wherein the raw materials for preparing the glycidyl acrylic resin comprise the following components: hydrophobic hard monomer, functional monomer, free radical initiator, chain transfer agent and solvent;
the hydrophobic hard monomer is one or more of methyl methacrylate, butyl methacrylate, n-butyl methacrylate and isobutyl methacrylate;
the functional monomer is glycidyl methacrylate.
3. The powder coating of claim 1, comprising the following components in parts by weight:
50-60 parts of modified matrix resin
10-15 parts of curing agent
25-40 parts of hardening filler.
4. The powder coating of claim 1, wherein the modified matrix resin has an epoxy equivalent weight of 750 to 890eq/100g.
5. The powder coating of claim 1, wherein the modified matrix resin has a glass transition temperature of 72-85 ℃.
6. The powder coating according to claim 1, wherein the weight ratio of the modified base resin to the curing agent is (3.
7. The powder coating of claim 1, further comprising leveling agents, hardening and scratch resistance agents, defoaming agents, ultraviolet absorbers, and light stabilizers.
8. A process for the preparation of a powder coating according to any one of claims 1 to 7, characterized in that it comprises the following steps:
mixing the components, crushing, extruding, tabletting, cooling and crushing to obtain the powder coating.
9. The method according to claim 8, wherein the modified base resin is prepared by the method comprising the steps of:
mixing a hydrophobic hard monomer and a functional monomer, then adding a free radical initiator, a chain transfer agent and a solvent, and carrying out solution polymerization reaction to obtain the modified matrix resin.
10. Use of the powder coating according to any one of claims 1 to 7 in the field of the coating of building materials.
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| CN116511009A (en) * | 2023-05-12 | 2023-08-01 | 河南省步步先动力科技有限公司 | Electrostatic coating process for product surface powder |
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