CN115746657B - Powder coating containing photocatalyst and preparation method thereof - Google Patents
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- CN115746657B CN115746657B CN202211326345.7A CN202211326345A CN115746657B CN 115746657 B CN115746657 B CN 115746657B CN 202211326345 A CN202211326345 A CN 202211326345A CN 115746657 B CN115746657 B CN 115746657B
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- 238000000576 coating method Methods 0.000 title claims abstract description 50
- 239000000843 powder Substances 0.000 title claims abstract description 50
- 239000011248 coating agent Substances 0.000 title claims abstract description 47
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003242 anti bacterial agent Substances 0.000 claims abstract description 33
- 239000002131 composite material Substances 0.000 claims abstract description 24
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 21
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 13
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 239000000945 filler Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 7
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 7
- 239000004593 Epoxy Substances 0.000 claims abstract description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000003822 epoxy resin Substances 0.000 claims abstract description 7
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 7
- 229920001225 polyester resin Polymers 0.000 claims abstract description 7
- 239000004645 polyester resin Substances 0.000 claims abstract description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 7
- 229920002050 silicone resin Polymers 0.000 claims abstract description 7
- YJVLWFXZVBOFRZ-UHFFFAOYSA-N titanium zinc Chemical compound [Ti].[Zn] YJVLWFXZVBOFRZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 22
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 11
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- -1 N-iodopropargyl oxycarbonyl amino Chemical group 0.000 claims description 5
- 125000004122 cyclic group Chemical group 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- BSKHPKMHTQYZBB-UHFFFAOYSA-N 2-methylpyridine Chemical compound CC1=CC=CC=N1 BSKHPKMHTQYZBB-UHFFFAOYSA-N 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 239000010428 baryte Substances 0.000 claims description 3
- 229910052601 baryte Inorganic materials 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 3
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 3
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 claims description 3
- FJOLTQXXWSRAIX-UHFFFAOYSA-K silver phosphate Chemical compound [Ag+].[Ag+].[Ag+].[O-]P([O-])([O-])=O FJOLTQXXWSRAIX-UHFFFAOYSA-K 0.000 claims description 3
- 229940019931 silver phosphate Drugs 0.000 claims description 3
- 229910000161 silver phosphate Inorganic materials 0.000 claims description 3
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 claims description 3
- 230000000844 anti-bacterial effect Effects 0.000 abstract description 17
- 230000003197 catalytic effect Effects 0.000 abstract description 5
- 230000004048 modification Effects 0.000 abstract description 5
- 238000012986 modification Methods 0.000 abstract description 5
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 abstract description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 5
- 230000001699 photocatalysis Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 238000007405 data analysis Methods 0.000 description 3
- 230000000593 degrading effect Effects 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- 241000700605 Viruses Species 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000003421 catalytic decomposition reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009396 hybridization Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- WPMYUUITDBHVQZ-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoic acid Chemical compound CC(C)(C)C1=CC(CCC(O)=O)=CC(C(C)(C)C)=C1O WPMYUUITDBHVQZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 239000004599 antimicrobial Substances 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004332 deodorization Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a powder coating containing a photocatalyst, which comprises the following preparation raw materials: hyperbranched epoxy resin, carboxyl-terminated polyester resin, silicone resin, epoxy modified acrylic resin, composite antibacterial agent, antioxidant, modified photocatalyst powder, composite filler and modified PTFE wax; the organic antibacterial agent and the inorganic antibacterial agent are compounded for use, so that the powder coating has excellent antibacterial performance; the modified photocatalyst is prepared by mixing nitrogen-doped titanium dioxide, iron-doped titanium dioxide and zinc-doped titanium dioxide in a specific proportion and then carrying out modification treatment, so that the modified photocatalyst material with the surface modified is obtained, further has excellent dispersibility in a powder coating system, has obvious catalytic effect and antibacterial effect, can degrade formaldehyde, and reduces the potential hazard of organic matters to indoor environment and human body.
Description
Technical Field
The invention relates to the field of paint preparation, in particular to a powder paint containing a photocatalyst and a preparation method thereof.
Background
The photocatalyst is a nano metal oxide material, under the action of light, water or oxygen in the air can be catalyzed into hydroxyl free radical, superoxide anion free radical, active oxygen and other active groups with extremely strong oxidizing ability, and the active groups are contacted with surrounding harmful gas, pollutants and bacteria to perform oxidation-reduction reaction. The strong oxidizing groups can decompose various organic compounds and partial inorganic matters with unstable chemical bonds, can destroy cell membranes of bacteria and protein carriers of coagulated viruses, and have extremely strong functions of sterilization, deodorization, antifouling self-cleaning and air purification. The photocatalytic material is effective for decomposing substances which are not large in initial amount and which grow, such as microorganisms such as bacteria, viruses, and the like. The photocatalyst has the advantage of resisting bacteria, and can decompose substances and dirt generated after the death of germs.
Although the prior art also has the field of applying photocatalyst materials to powder coatings, the following problems still remain: in the prior art, the photocatalytic components are poorly dispersed in the powder coating, and the photocatalytic coating can be subjected to certain catalytic decomposition under the conditions of stronger ultraviolet light and visible light, so that the catalytic effect and the antibacterial effect are poor.
Disclosure of Invention
Based on the above, in order to solve the problem that the photocatalytic component is poorly dispersed in the powder coating, the photocatalytic coating can be subjected to certain catalytic decomposition under the conditions of stronger ultraviolet light and visible light, so that the catalytic effect and the antibacterial effect are poor, the invention provides the powder coating containing the photocatalyst, which has the following specific technical scheme:
the powder coating containing the photocatalyst comprises the following preparation raw materials in parts by weight: 32-40 parts of hyperbranched epoxy resin, 26-30 parts of carboxyl-terminated polyester resin, 15-20 parts of silicone resin, 10-15 parts of epoxy modified acrylic resin, 1-5 parts of composite antibacterial agent, 1-4 parts of antioxidant, 5-11 parts of modified photocatalyst powder, 1-10 parts of composite filler and 1-3 parts of modified PTFE wax;
the composite antibacterial agent is prepared by compounding an organic antibacterial agent and an inorganic antibacterial agent according to the mass ratio of 1-3:1-5;
the modified photocatalyst powder is prepared by mixing nitrogen-doped titanium dioxide, iron-doped titanium dioxide and zinc-doped titanium dioxide according to a mass ratio of 1-5:1-7:1-2 and then treating the mixture with a silane coupling agent.
Further, the organic antibacterial agent is at least one of picoline, N-iodopropargyl oxycarbonyl amino acid, stannous octoate and carbon nanotube grafted quaternary ammonium salt.
Further, the inorganic antibacterial agent is at least one of silver phosphate, silver powder and silver bromide.
Further, the antioxidant is at least one of tri (2, 4-di-tert-butylphenyl) phosphite and beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-stearyl alcohol ester.
Further, the composite filler is at least one of barium sulfate, calcium carbonate and barite.
Further, the silane coupling agent is treated as follows: adding 10-15 times of silane coupling agent, setting the temperature to 45-65 ℃, stirring for 10min under the condition of 500-800 r/min, standing for 20-30 min, continuously carrying out cyclic treatment for 3-5 times under the same condition, and drying.
The application also provides a preparation method of the powder coating containing the photocatalyst, which comprises the following steps:
mixing an antibacterial agent, an antioxidant and modified photocatalyst powder, and uniformly stirring at a stirring speed of 250-500 r/min to obtain a mixture A;
mixing hyperbranched epoxy resin, carboxyl-terminated polyester resin, silicone resin, epoxy modified acrylic resin, composite antibacterial agent, antioxidant, modified photocatalyst powder, composite filler and modified PTFE wax, and uniformly stirring at a stirring speed of 500-1000 r/min to obtain a mixture B;
adding the mixture A into the mixture B, and continuously stirring for 10-40 min at a stirring speed of 500-1000 r/min to obtain a mixture C;
and (3) feeding the mixture C into a double-screw extruder for melt extrusion, and then crushing and sieving to obtain the powder coating containing the photocatalyst.
Further, in the melt extrusion, the temperature of a charging section is 75-80 ℃, the temperature of a melting section is 100-110 ℃, and the temperature of a discharging section is 120 ℃.
Further, the crushed materials are sieved by a 180-200 mesh sieve.
In the scheme, the organic antibacterial agent and the inorganic antibacterial agent are compounded for use, so that the excellent antibacterial performance of the powder coating can be endowed; the modified photocatalyst is prepared by mixing nitrogen-doped titanium dioxide, iron-doped titanium dioxide and zinc-doped titanium dioxide in a specific proportion and then carrying out modification treatment, so that a surface-modified photocatalyst material is obtained, and further the modified photocatalyst has excellent dispersibility in a powder coating system, the components of the modified photocatalyst act synergistically, hybridization can be reduced, electron hole pairs can be generated by irradiation light with lower energy, and the effect of a composite antibacterial agent is combined, so that a remarkable catalytic effect and antibacterial effect can be achieved; in addition, the powder coating is stable on the whole, the formed coating is stable, and the coating still has obvious formaldehyde degradation effect under long-time continuous illumination, so that the potential hazard of organic matters to indoor environment and human body is reduced.
Detailed Description
The present invention will be described in further detail with reference to the following examples thereof in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
According to the photocatalyst-containing powder coating in the embodiment of the invention, the powder coating comprises the following preparation raw materials in parts by weight: 32-40 parts of hyperbranched epoxy resin, 26-30 parts of carboxyl-terminated polyester resin, 15-20 parts of silicone resin, 10-15 parts of epoxy modified acrylic resin, 1-5 parts of composite antibacterial agent, 1-4 parts of antioxidant, 5-11 parts of modified photocatalyst powder, 1-10 parts of composite filler and 1-3 parts of modified PTFE wax;
the composite antibacterial agent is prepared by compounding an organic antibacterial agent and an inorganic antibacterial agent according to the mass ratio of 1-3:1-5;
the modified photocatalyst powder is prepared by mixing nitrogen-doped titanium dioxide, iron-doped titanium dioxide and zinc-doped titanium dioxide according to a mass ratio of 1-5:1-7:1-2 and then treating the mixture with a silane coupling agent.
In one embodiment, the organic antimicrobial agent is at least one of picoline, N-iodopropargyloxycarbonyl amino acid, stannous octoate, and carbon nanotube grafted quaternary ammonium salt.
In one embodiment, the inorganic antibacterial agent is at least one of silver phosphate, silver powder, and silver bromide.
In one embodiment, the antioxidant is at least one of tri (2, 4-di-tert-butylphenyl) phosphite and n-stearyl β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.
In one embodiment, the composite filler is at least one of barium sulfate, calcium carbonate, and barite.
In one embodiment, the silane coupling agent treatment is: adding 10-15 times of silane coupling agent, setting the temperature to 45-65 ℃, stirring for 10min under the condition of 500-800 r/min, standing for 20-30 min, continuously carrying out cyclic treatment for 3-5 times under the same condition, and drying.
The application also provides a preparation method of the powder coating containing the photocatalyst, which comprises the following steps:
mixing an antibacterial agent, an antioxidant and modified photocatalyst powder, and uniformly stirring at a stirring speed of 250-500 r/min to obtain a mixture A;
mixing hyperbranched epoxy resin, carboxyl-terminated polyester resin, silicone resin, epoxy modified acrylic resin, composite antibacterial agent, antioxidant, modified photocatalyst powder, composite filler and modified PTFE wax, and uniformly stirring at a stirring speed of 500-1000 r/min to obtain a mixture B;
adding the mixture A into the mixture B, and continuously stirring for 10-40 min at a stirring speed of 500-1000 r/min to obtain a mixture C;
and (3) feeding the mixture C into a double-screw extruder for melt extrusion, and then crushing and sieving to obtain the powder coating containing the photocatalyst.
In one embodiment, the temperature of a charging section in the melt extrusion is 75-80 ℃, the temperature of a melting section is 100-110 ℃, and the temperature of a discharging section is 120 ℃.
In one embodiment, the comminuting screen is sized 180-200 mesh.
In the scheme, the organic antibacterial agent and the inorganic antibacterial agent are compounded for use, so that the excellent antibacterial performance of the powder coating can be endowed; the modified photocatalyst is prepared by mixing nitrogen-doped titanium dioxide, iron-doped titanium dioxide and zinc-doped titanium dioxide in a specific proportion and then carrying out modification treatment, so that a surface-modified photocatalyst material is obtained, and further the modified photocatalyst has excellent dispersibility in a powder coating system, the components of the modified photocatalyst act synergistically, hybridization can be reduced, electron hole pairs can be generated by irradiation light with lower energy, and the effect of a composite antibacterial agent is combined, so that a remarkable catalytic effect and antibacterial effect can be achieved; in addition, the powder coating is stable on the whole, the formed coating is stable, and the coating still has obvious formaldehyde degradation effect under long-time continuous illumination, so that the potential hazard of organic matters to indoor environment and human body is reduced.
Embodiments of the present invention will be described in detail below with reference to specific examples.
The preparation raw materials and the preparation raw material ratios of examples 1 to 3 and comparative examples 1 to 5 are different, and are specifically shown in table 1:
the preparation process of the powder coating in examples 1-3 and comparative examples 1-5 is as follows:
a preparation method of a powder coating containing a photocatalyst comprises the following steps:
mixing nitrogen-doped titanium dioxide, iron-doped titanium dioxide and zinc-doped titanium dioxide according to a certain mass ratio, adding 15 times of silane coupling agent, setting the temperature to 45-65 ℃, stirring for 10min under the condition of 500r/min, standing for 20min, continuously carrying out cyclic treatment for 5 times under the same condition, and drying to obtain modified photocatalyst powder;
mixing an antibacterial agent, an antioxidant and modified photocatalyst powder, and uniformly stirring at a stirring speed of 500r/min to obtain a mixture A;
mixing hyperbranched epoxy resin, carboxyl-terminated polyester resin, silicone resin, epoxy modified acrylic resin, composite antibacterial agent, antioxidant, modified photocatalyst powder, composite filler and modified PTFE wax, and uniformly stirring at a stirring speed of 1000r/min to obtain a mixture B;
adding the mixture A into the mixture B, and continuously stirring for 40min at a stirring speed of 1000r/min to obtain a mixture C;
and (3) feeding the mixture C into a double-screw extruder for melt extrusion, and then crushing and sieving the mixture C with a 200-mesh sieve to obtain the powder coating containing the photocatalyst.
Comparative example 6:
the difference from example 3 is only that the nitrogen-doped titanium oxide, the iron-doped titanium oxide, and the zinc-doped titanium oxide in comparative example 6 were not treated with the silane coupling agent, and the other is the same as example 3.
Table 1: parts by weight of unit
The powder coatings obtained in examples 1-3 and comparative examples 1-6 were tested.
Performance test: the results are shown in Table 2. Wherein, the conventional properties of powder coating such as gel time, appearance of coating film, thickness of coating film, hardness, adhesion, impact resistance, bending resistance, glossiness, alkali resistance, acid resistance, boiling water resistance, wet heat resistance, artificial aging resistance and the like are tested according to HG/T2006-2006 standard.
Table 2:
from the data analysis in table 1, it is known that the components and the component proportions of the coating film are different, which results in the change of the performance of the coating film, and the modification of the photocatalyst component of the coating film is helpful to improve the dispersibility of the whole powder coating, so that the coating film with smooth and flat surface is formed, and the coating film has excellent overall adhesive force, weather resistance and acid and alkali resistance, no cracking and peeling after manual treatment, and excellent service performance.
And (3) degrading formaldehyde: formaldehyde removal degradation testing was performed according to JC/T1074-2008 and GB/T16129-1995; the test method comprises the following steps: the test conditions of the sample equipment are that the temperature of the sample equipment is 20+/-2 ℃ and the humidity of the sample equipment is 50+/-10 ℃ and the temperature of the sample equipment is 5, the sample equipment is 1m, the sample equipment is an intelligent constant-current atmospheric sampler and an ultraviolet-visible spectrophotometer, after the powder coatings prepared in the examples 1-3 and the comparative examples 1-6 are coated to form a coating, a coating sample (with the specification of 400mmx400 mm) is placed in the test chamber, a blank test chamber is arranged, and the final obtained result is shown in the table 3.
Table 3:
from the data analysis of table 3, the synergistic effect among the modified photocatalyst components in the application can play an excellent role in degrading formaldehyde, and the use of the composite antibacterial agent can play a certain positive role in degrading formaldehyde in the application, which indicates that the overall performance of the system of the powder coating is changed due to the change of the components and the component proportion, and indicates that the application is creative as a complete technical formula. In comparative example 6, the non-modified component was added to the powder coating material, and the degradation effect was exhibited.
Antibacterial test: referring to GB/T30706-2014, the results obtained are shown in Table 4.
Table 4:
as can be seen from the data analysis described in table 4, the powder coating in the present application has an excellent antibacterial effect, and the change of the antibacterial component in comparative examples 1 to 2 results in a significant decrease in antibacterial performance, which indicates that the addition of the antibacterial component in the present application plays a significant role in antibacterial performance, but as can be seen from comparative examples 3 to 6, the component of the modified photocatalyst is changed on the premise that the composite antibacterial component is added, which results in an antibacterial performance that is still inferior to that in examples 1 to 3, the change of the component of the modified photocatalyst and the change of the process also affect the antibacterial effect of the present application, which indicates that there is a synergistic effect between the components of the present application, and an effect of one to one of more than two is achieved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (3)
1. The photocatalyst-containing powder coating is characterized by comprising the following preparation raw materials in parts by weight: 32-40 parts of hyperbranched epoxy resin, 26-30 parts of carboxyl-terminated polyester resin, 15-20 parts of silicone resin, 10-15 parts of epoxy modified acrylic resin, 1-5 parts of composite antibacterial agent, 1-4 parts of antioxidant, 5-11 parts of modified photocatalyst powder, 1-10 parts of composite filler and 1-3 parts of modified PTFE wax;
the composite antibacterial agent is prepared by compounding an organic antibacterial agent and an inorganic antibacterial agent according to the mass ratio of 1-3:1-5; wherein the organic antibacterial agent is at least one of picoline, N-iodopropargyl oxycarbonyl amino acid, stannous octoate and carbon nano tube grafted quaternary ammonium salt; the inorganic antibacterial agent is at least one of silver phosphate, silver powder and silver bromide;
the modified photocatalyst powder is obtained by mixing nitrogen-doped titanium dioxide, iron-doped titanium dioxide and zinc-doped titanium dioxide according to the mass ratio of 1-5:1-7:1-2 and then treating the mixture with a silane coupling agent;
the silane coupling agent is treated by: adding 10-15 times of silane coupling agent, setting the temperature to 45-65 ℃, stirring for 10min under the condition of 500-800 r/min, standing for 20-30 min, continuously carrying out cyclic treatment for 3-5 times under the same condition, and drying.
2. The photocatalyst-containing powder coating material as claimed in claim 1, wherein the antioxidant is at least one of tris (2, 4-di-t-butylphenyl) phosphite and n-stearyl β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate.
3. The photocatalyst-containing powder coating material according to claim 1, wherein the composite filler is at least one of barium sulfate, calcium carbonate, and barite.
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