CN116285563A - Silica sol modified waterborne epoxy anticorrosive paint and preparation method thereof - Google Patents
Silica sol modified waterborne epoxy anticorrosive paint and preparation method thereof Download PDFInfo
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- CN116285563A CN116285563A CN202211681802.4A CN202211681802A CN116285563A CN 116285563 A CN116285563 A CN 116285563A CN 202211681802 A CN202211681802 A CN 202211681802A CN 116285563 A CN116285563 A CN 116285563A
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- silica sol
- agent
- water
- anticorrosive paint
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- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000003973 paint Substances 0.000 title claims abstract description 43
- 239000004593 Epoxy Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 39
- 238000000576 coating method Methods 0.000 claims abstract description 22
- 239000008367 deionised water Substances 0.000 claims abstract description 22
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 22
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 21
- 239000003822 epoxy resin Substances 0.000 claims abstract description 18
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 239000004952 Polyamide Substances 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002270 dispersing agent Substances 0.000 claims abstract description 11
- 238000000227 grinding Methods 0.000 claims abstract description 11
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 229920002647 polyamide Polymers 0.000 claims abstract description 11
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 11
- 239000002562 thickening agent Substances 0.000 claims abstract description 11
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims abstract description 11
- 239000000080 wetting agent Substances 0.000 claims abstract description 11
- 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 claims abstract description 11
- 229910000165 zinc phosphate Inorganic materials 0.000 claims abstract description 11
- 239000000049 pigment Substances 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 15
- 238000010276 construction Methods 0.000 claims description 10
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000003112 inhibitor Substances 0.000 claims description 7
- 229920001221 xylan Polymers 0.000 claims description 7
- 150000004823 xylans Chemical class 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- YJVFFLUZDVXJQI-UHFFFAOYSA-L palladium(ii) acetate Chemical group [Pd+2].CC([O-])=O.CC([O-])=O YJVFFLUZDVXJQI-UHFFFAOYSA-L 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 abstract description 7
- 238000001035 drying Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000843 powder Substances 0.000 abstract 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Inorganic materials [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 14
- 239000000203 mixture Substances 0.000 description 9
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000004408 titanium dioxide Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000012855 volatile organic compound Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 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 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920006334 epoxy coating Polymers 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- -1 mechanical equipment Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000005311 nuclear magnetism Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
-
- 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- 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
- C09D5/08—Anti-corrosive paints
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
Abstract
The invention discloses a silica sol modified waterborne epoxy anticorrosive paint and a preparation method thereof, wherein a part A of the silica sol modified waterborne epoxy anticorrosive paint consists of deionized water, a dispersing agent, a defoaming agent, an anti-settling agent, pigment, aluminum tripolyphosphate, zinc phosphate, filler, waterborne epoxy resin, silica sol, a film forming agent, a wetting agent, an anti-flash rust agent and a thickening agent, and a part B consists of deionized water and water-soluble polyamide, wherein the proportion of A to B is 5:1. The preparation method comprises the steps of high-speed dispersion and grinding of a powder water phase, uniform mixing of slurry, aqueous epoxy resin and silica sol, and finally adjustment of viscosity; the invention has the advantages that: by adding the modified silica sol, the film surface hardness of the water-based epoxy anticorrosive paint is effectively improved, the surface drying speed is improved, the hardness reaches 2H, and the paint surface drying speed is controlled within 35 minutes; meanwhile, the silica sol replaces a part of water-based epoxy resin, so that the manufacturing cost of the coating is obviously reduced, and the market competitiveness of the product is effectively improved.
Description
Technical Field
The invention relates to a waterborne epoxy anticorrosive paint and a preparation method thereof, in particular to a waterborne epoxy anticorrosive paint modified by silica sol and a preparation method thereof, which can be used as a primer anticorrosive and antirust coating for metal materials such as mechanical equipment, steel towers, transport vehicles and the like. Belongs to the field of paint.
Background
The epoxy anticorrosive paint has excellent chemical stability. The performance of the epoxy paint for resisting corrosion of various mediums such as alkali, acid, salt and the like is superior to that of other unsaturated thermosetting resins, so that the epoxy paint is used as an anti-corrosion base coat in a large quantity. But the development of solvent type epoxy anticorrosive paint is more and more limited at present.
With the control of Volatile Organic Compounds (VOCs) of coatings, the development of low VOC, environmentally friendly coatings is one of the most important developments in the coatings industry. The aqueous epoxy anticorrosive paint developed at present has been applied in some fields, and the environmental friendliness and the health to human are incomparable with those of the solvent-type epoxy anticorrosive paint.
Aqueous epoxy anticorrosive coatings have several advantages over solvent-borne epoxy coatings, but have some impediments to development. Such as aqueous epoxy anticorrosive coatings, have had a performance deficiency. In the current use performance, most of the physical properties such as paint film hardness, drying speed and the like of the water-based epoxy anticorrosive paint have obvious differences from solvent type paint cost. This is mainly determined by the properties developed by the aqueous epoxy resin, which is the film-forming binder selected for the current aqueous epoxy anticorrosive paint.
Disclosure of Invention
In order to solve the problems, the invention provides a silica sol modified anticorrosive paint and a preparation method thereof, wherein the silica sol modified waterborne epoxy anticorrosive paint is prepared by adding silica sol with a certain concentration and a certain mass fraction so as to improve and remedy the performance defects of waterborne epoxy resin.
Silica sol (silica sol), also known as silicate water glass, is an inorganic polymeric polysilicic acid colloid solution with water as the dispersed phase. It is odorless and tasteless, has a considerable specific surface area, and the particles themselves are colorless and transparent, which does not affect the properties of the coating. The colloidal particles typically have a diameter of 5-8NM, less than the diameter of the aqueous epoxy resin emulsion, and a permeability of 0.1-10UM. The permeation effect is very good. The xylan is modified by reaction with the silica sol, and as the water evaporates, si-O bonds are formed, which can enhance the rigidity and bonding ability of the coating. The silica sol particles permeate and fill the coating formed by the epoxy resin on the surface of the substrate, and the organic-inorganic composite coating is prepared by adding the silica sol, so that the comprehensive anti-corrosion performance of the paint film is greatly improved.
The reaction process is as follows:
the xylan is dissolved in toluene, the silica sol is dissolved in water, a catalyst is added, and the reaction is carried out for 6 to 12 hours at 70 ℃ under the protection of nitrogen, and the modified silica sol is obtained after the reaction is finished.
Wherein the mass ratio of the xylan to the silica sol is 5:1, the catalyst is palladium acetate, and the addition amount is 1% of the mass of the silica sol. The molecular weight of the modified silica sol is 5000-100000.
The technical scheme of the invention is as follows:
the silica sol modified water-based epoxy anticorrosive paint comprises the following components in parts by weight:
and (3) a component A:
12-20 parts of deionized water
0.6 to 1.2 portions of dispersing agent
0.05 to 0.15 part of defoaming agent
0.1 to 0.5 part of anti-settling agent
Pigment 6-15 parts
3-5 parts of zinc phosphate
3 to 5 portions of aluminum tripolyphosphate
Sericite 2-4 parts
10-15 parts of filler
40-50 parts of water-based epoxy resin
3-7 parts of modified silica sol
0.2 to 0.4 part of wetting agent
0.6 to 1.0 part of film forming agent
0.05 to 0.15 part of defoaming agent
0.5 to 1.0 part of flash rust inhibitor
0.6 to 1.0 part of thickener
And the component B comprises the following components:
9.5-12.5 parts of water-soluble polyamide curing agent
Deionized water 7.5-10.5 parts
The pigment is rutile type titanium dioxide, iron oxide red, iron oxide yellow and iron oxide black, and the fineness is required to be below 1250 meshes; the filler is precipitated barium sulfate and talcum powder, and the fineness is required to be 800-1250 meshes. All raw materials are commercially available.
The using mass ratio of the A, B parts is as follows: a: b=5:1.
A preparation method of a silica sol modified waterborne epoxy anticorrosive paint comprises the following steps:
15 to 20 parts of deionized water is placed into a dispersion tank, 0.6 to 1.2 parts of dispersing agent, 0.05 to 0.15 part of defoaming agent and 0.1 to 05 parts of anti-settling agent are slowly added in sequence at the rotation speed of a high-speed extension machine of 400 to 600 per minute, and then the mixture is fully stirred for 10 minutes; and then 6 to 15 parts of pigment, 3 to 5 parts of zinc phosphate, 3 to 5 parts of aluminum tripolyphosphate and 10 to 15 parts of filler are sequentially added, after the addition is finished, the rotating speed is increased to 1500 revolutions per minute, after 30 minutes of high-speed dispersion, the mixture is transferred to a sand mill for grinding, and the grinding fineness is below 20 microns. Adding the ground slurry into a paint mixing tank, and adding 40-50 parts of water-based epoxy resin at the rotating speed of 800-900 rpm. Then adding 3-6 parts of modified silica sol, stirring for 10 minutes, sequentially adding 0.2-0.4 part of wetting agent, 0.6-1.0 part of film forming agent, 0.05-0.15 part of defoaming agent, 0.5-1.0 part of flash rust inhibitor, 2-4 parts of sericite, stirring for 20 minutes after the addition is finished, slowly adding 0.6-1.0 part of thickening agent, and viscosity is 85-90 KU, so far, the component A is finished; 9.5 to 12.5 parts of water-soluble polyamide curing agent in the mixing tank, 7.5 to 10.5 parts of deionized water and 600 to 800 revolutions per minute are added, and the mixture is stirred for 20 minutes, thus obtaining the component B. And during the coating construction, the component B is added according to the proportion of A to B=5 to 1, so that the coating can be sprayed and coated for construction.
The invention has the advantages that: according to the invention, the silica sol is adopted to replace part of the water-based epoxy resin, so that the manufacturing cost of the paint is effectively reduced, the characteristics of the silica sol are obviously combined together through mutual permeation of the organic resin and the inorganic silica gel particle system, and the surface drying speed of the water-based epoxy anticorrosive paint is improved to be within 35 minutes (detection standard: GB/T1728- (79) 88); the hardness reaches 2H (detection standard: GB/T6739-2006).
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and explanation only and is not intended to limit the present invention.
Dissolving xylan in toluene, dissolving silica sol in water, adding a catalyst, reacting at 70 ℃ for 6-12h under the protection of nitrogen, pouring the reaction solution into absolute ethyl alcohol after the reaction is finished, centrifuging, and washing to obtain the modified silica sol.
Wherein the mass ratio of the xylan to the silica sol is 5:1, the catalyst is palladium acetate, and the addition amount is 1% of the mass of the silica sol. The molecular weight of the modified silica sol is 5000-100000.
And obtaining the modified silica sol through measuring nuclear magnetism.
Example 1
The silica sol modified waterborne epoxy anticorrosive paint consists of the following components in parts by weight:
and (3) a component A:
deionized water 20 parts
1.0 part of dispersant
0.1 part of defoaming agent
0.3 part of anti-settling agent
Titanium dioxide 6 parts
Iron oxide black 5 parts
3 parts of zinc phosphate
Aluminum tripolyphosphate 4 parts
Sericite 3 parts
10 parts of barium sulfate
41 parts of aqueous epoxy resin
4 parts of modified silica sol
Wetting agent 0.3 part
Film Forming agent 1.0 part
0.1 part of defoaming agent
Flash rust inhibitor 0.6 part
0.6 part of thickener
Total 100 parts
And the component B comprises the following components:
10 parts of water-soluble polyamide curing agent
Deionized water 10 parts
And (3) a component A: component B = 5:1.
The preparation method of the silica sol modified waterborne epoxy anticorrosive paint comprises the following steps:
20 parts of deionized water is dispensed into a dispersion tank, 1.0 part of dispersing agent, 0.1 part of defoaming agent and 0.3 part of anti-settling agent are slowly added in sequence at the speed of 400 rpm of a high-speed extension machine, and then the mixture is fully stirred for 10 minutes; then 6 parts of pigment, 3 parts of zinc phosphate, 4 parts of aluminum tripolyphosphate and 10 parts of barium sulfate are sequentially added, after the addition is finished,
the rotating speed is increased to 1500 revolutions per minute, the high-speed dispersion is carried out for 30 minutes, and then the mixture is transferred to a sand mill for grinding, and the grinding fineness is below 20 microns. Adding the ground slurry into a paint mixing tank, and adding 41 parts of aqueous epoxy resin at the rotating speed of 800-900 rpm. Then adding 4 parts of modified silica sol, stirring for 10 minutes, sequentially adding 0.3 part of wetting agent, 1.0 part of film forming agent, 0.1 part of defoaming agent, 0.8 part of anti-flash rust agent and 3 parts of sericite, slowly adding 0.6 part of thickening agent after stirring for 20 minutes, and completing the component A until the viscosity is 88 KU; 10 parts of water-soluble polyamide curing agent in a mixing tank, 10 parts of deionized water and stirring for 20 minutes at 600-800 rpm are added, so that the component B can be prepared. And during the coating construction, the component B is added according to the proportion of A to B=5 to 1, so that the coating can be sprayed and coated for construction.
Results:
| item(s) | Detecting data | Standard of |
| Time of surface drying | Room temperature 25 ℃ for 35 minutes | GB/T1728-79(88) |
| Fineness of | ≤20μm | GB/T6731-2007 |
| Adhesion force | Grade less than or equal to 0 | GB1720-79（89） |
| Hardness of | H is less than hardness is less than 2H | GB/T6739-2006 |
| Salt spray resistance | 600h | GB/T1771-2007 |
Example 2
The silica sol modified waterborne epoxy anticorrosive paint consists of the following components in parts by weight:
and (3) a component A:
15.5 parts of deionized water
1.0 part of dispersant
0.1 part of defoaming agent
0.3 part of anti-settling agent
Titanium dioxide 6 parts
Iron oxide black 5 parts
3 parts of zinc phosphate
Aluminum tripolyphosphate 4 parts
Sericite 3 parts
9 parts of barium sulfate
45 parts of aqueous epoxy resin
5.5 parts of modified silica sol
Wetting agent 0.3 part
Film Forming agent 1.0 part
0.1 part of defoaming agent
Flash rust inhibitor 0.6 part
0.6 part of thickener
Total 100 parts
And the component B comprises the following components:
11.1 parts of water-soluble polyamide curing agent
8.9 parts of deionized water.
The preparation method of the silica sol modified waterborne epoxy anticorrosive paint comprises the following steps:
15.5 parts of deionized water is placed into a dispersing tank, 1.0 part of dispersing agent, 0.1 part of defoaming agent and 0.3 part of anti-settling agent are slowly added in sequence at the rotation speed of a high-speed extension machine of 400-600 rpm, and then the mixture is fully stirred for 10 minutes; and then 6 parts of pigment, 3 parts of zinc phosphate, 4 parts of aluminum tripolyphosphate and 9 parts of barium sulfate are sequentially added, after the addition is finished, the rotating speed is increased to 1500 revolutions per minute, after the high-speed dispersion is carried out for 30 minutes, the mixture is transferred to a sand mill for grinding, and the grinding fineness is lower than 20 microns. The ground sizing agent is added into a paint mixing tank, and 45 parts of water-based epoxy resin is added at the rotating speed of 800-900 rpm. Then adding 5.5 parts of silica sol, stirring for 10 minutes, sequentially adding 0.3 part of wetting agent, 1.0 part of film forming agent, 0.1 part of defoaming agent, 0.8 part of anti-flash rust agent, 3 parts of sericite, slowly adding 0.6 part of thickening agent after the addition is finished, and stirring for 20 minutes until the viscosity is 88KU, thus finishing the component A; 11.1 parts of water-soluble polyamide curing agent in a mixing tank, 8.9 parts of deionized water and 600-800 r/min stirring for 20 min can be added, and the component B is added according to the proportion of A to B=5 to 1 during construction of the component B coating, so that spraying and coating construction can be performed.
Results:
| item(s) | Detecting data | Standard of |
| Time of surface drying | Room temperature 25 ℃ for 30 minutes | GB/T1728-79(88) |
| Fineness of | ≤25μm | GB/T6731-2007 |
| Adhesion force | Grade less than or equal to 0 | GB1720-79（89） |
| Hardness of | ≤1H | GB/T6739-2006 |
| Salt spray resistance | 600h | GB/T1771-2007 |
Example 3
The silica sol modified waterborne epoxy anticorrosive paint consists of the following components in parts by weight:
and (3) a component A:
15 parts of deionized water
1.0 part of dispersant
0.1 part of defoaming agent
0.3 part of anti-settling agent
Titanium dioxide 6 parts
Iron oxide black 5 parts
3 parts of zinc phosphate
3 parts of aluminum tripolyphosphate
Sericite 3 parts
Barium sulfate 6 parts
48.5 parts of aqueous epoxy resin
6.5 parts of modified silica sol
Wetting agent 0.3 part
Film Forming agent 1.0 part
0.1 part of defoaming agent
Flash rust inhibitor 0.6 part
0.6 part of thickener
Total 100 parts
And the component B comprises the following components:
12.1 parts of water-soluble polyamide curing agent
And 7.9 parts of deionized water.
The preparation method of the silica sol modified waterborne epoxy anticorrosive paint comprises the following steps:
15 parts of deionized water is placed into a dispersing tank, 1.0 part of dispersing agent, 0.1 part of defoaming agent and 0.3 part of anti-settling agent are slowly added in sequence at the rotation speed of 400-600 rpm of a high-speed extension machine, and then the mixture is fully stirred for 10 minutes; and then 6 parts of pigment, 3 parts of zinc phosphate, 4 parts of aluminum tripolyphosphate and 6 parts of barium sulfate are sequentially added, after the addition is finished, the rotating speed is increased to 1500 revolutions per minute, after the high-speed dispersion is carried out for 30 minutes, the mixture is transferred to a sand mill for grinding, and the grinding fineness is lower than 20 microns. Adding the ground slurry into a paint mixing tank, and adding 48.5 parts of water-based epoxy resin at the rotating speed of 800-900 rpm. Then adding 6.5 parts of silica sol, stirring for 10 minutes, sequentially adding 0.3 part of wetting agent, 1.0 part of film forming agent, 0.1 part of defoaming agent, 0.8 part of anti-flash rust agent, 3 parts of sericite, slowly adding 0.6 part of thickening agent after the addition is finished, and stirring for 20 minutes until the viscosity is 88KU, thus finishing the component A; 12.1 parts of water-soluble polyamide curing agent in a mixing tank, 7.9 parts of deionized water and 600-800 r/min stirring for 20 min are added, and the component B is added according to the proportion of A to B=5 to 1 during construction of the component B coating, so that spraying and coating construction can be performed.
Results:
| item(s) | Detecting data | Standard of |
| Time of surface drying | Room temperature 25 ℃ for 30 minutes | GB/T1728-79(88) |
| Fineness of | ≤30μm | GB/T6731-2007 |
| Adhesion force | Grade less than or equal to 0 | GB1720-79（89） |
| Hardness of | 1H | GB/T6739-2006 |
| Salt spray resistance | 700h | GB/T1771-2007 |
In each embodiment of the invention, the used chemical materials are all materials used in the production in the field, can be obtained from the market, and have no influence on the production result; the equipment used in each process is conventional equipment used in the current production, and no special part is found.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The silica sol modified water-based epoxy anticorrosive paint comprises the following components in parts by weight:
and (3) a component A:
12-20 parts of deionized water
0.6 to 1.2 portions of dispersing agent
0.05 to 0.15 part of defoaming agent
0.1 to 0.5 part of anti-settling agent
Pigment 6-15 parts
3-5 parts of zinc phosphate
3 to 5 portions of aluminum tripolyphosphate
Sericite 2-4 parts
10-15 parts of filler
40-50 parts of water-based epoxy resin
3-7 parts of modified silica sol
0.2 to 0.4 part of wetting agent
0.6 to 1.0 part of film forming agent
0.05 to 0.15 part of defoaming agent
0.5 to 1.0 part of flash rust inhibitor
0.6 to 1.0 part of thickener
And the component B comprises the following components:
9.5 to 12.5 parts of water-soluble polyamide curing agent
7.5 to 10.5 portions of deionized water.
2. The silica sol modified waterborne epoxy anticorrosive paint according to claim 1, wherein the silica sol modified waterborne epoxy anticorrosive paint is a two-component paint, the A part is a paint main agent, the B part is a curing agent, and the mass ratio of A to B is 5:1.
3. The silica sol modified waterborne epoxy anticorrosive paint according to claim 1, wherein the preparation method of the modified silica sol is as follows: the preparation method comprises the steps of dissolving xylan in toluene, dissolving silica sol in water, adding a catalyst, reacting for 6-12h at 70 ℃ under the protection of nitrogen, pouring the reaction solution into absolute ethyl alcohol after the reaction is finished, centrifuging, and washing to obtain modified silica sol, wherein the mass ratio of the xylan to the silica sol is 5:1, the catalyst is palladium acetate, and the adding amount is 1% of the mass of the silica sol.
4. A method for preparing a silica sol modified waterborne epoxy anticorrosive coating according to any of claims 1-4, comprising the steps of:
15 to 20 parts of deionized water is sent into a dispersing tank, 0.6 to 1.2 parts of dispersing agent, 0.05 to 0.15 part of defoaming agent and 0.1 to 05 parts of anti-settling agent are sequentially and slowly added at the speed of 400 to 600 revolutions per minute of a high-speed extension machine, and then
Fully stirring for 10 minutes; then adding 6-15 parts of pigment, 3-5 parts of zinc phosphate, 3-5 parts of aluminum tripolyphosphate and 10-15 parts of filler in sequence, after the addition is finished, increasing the rotating speed to 1500 revolutions per minute, dispersing at high speed for 30 minutes, and then transferring to a sand mill for grinding, wherein the grinding fineness is below 20 microns; adding the ground slurry into a paint mixing tank, and adding 40-50 parts of water-based epoxy resin at the rotating speed of 800-900 rpm; then adding 3-6 parts of modified silica sol, stirring for 10 minutes, sequentially adding 0.2-0.4 part of wetting agent, 0.6-1.0 part of film forming agent, 0.05-0.15 part of defoaming agent, 0.5-1.0 part of flash rust inhibitor, 2-4 parts of sericite, stirring for 20 minutes after the addition is finished, slowly adding 0.6-1.0 part of thickening agent, and viscosity is 85-90 KU, so far, the component A is finished; adding 9.5-12.5 parts of water-soluble polyamide curing agent and 7.5-10.5 parts of deionized water into a mixing tank, and stirring for 20 minutes at 600-800 rpm to obtain a component B; and during the coating construction, the component B is added according to the proportion of A to B=5 to 1, so that the coating can be sprayed and coated for construction.
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