CN114369379A - Anti-sagging water-based inorganic zinc-rich coating and preparation method thereof - Google Patents
Anti-sagging water-based inorganic zinc-rich coating and preparation method thereof Download PDFInfo
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- CN114369379A CN114369379A CN202111516530.8A CN202111516530A CN114369379A CN 114369379 A CN114369379 A CN 114369379A CN 202111516530 A CN202111516530 A CN 202111516530A CN 114369379 A CN114369379 A CN 114369379A
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 140
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 239000011701 zinc Substances 0.000 title claims abstract description 115
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 115
- 238000000576 coating method Methods 0.000 title claims abstract description 78
- 239000011248 coating agent Substances 0.000 title claims abstract description 76
- 238000007665 sagging Methods 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 239000011347 resin Substances 0.000 claims abstract description 111
- 229920005989 resin Polymers 0.000 claims abstract description 111
- 239000006254 rheological additive Substances 0.000 claims abstract description 64
- 239000000843 powder Substances 0.000 claims abstract description 52
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 43
- 239000001913 cellulose Substances 0.000 claims abstract description 22
- 229920002678 cellulose Polymers 0.000 claims abstract description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910021485 fumed silica Inorganic materials 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims description 24
- 239000007787 solid Substances 0.000 claims description 21
- 239000004925 Acrylic resin Substances 0.000 claims description 14
- 229920000178 Acrylic resin Polymers 0.000 claims description 14
- 239000004111 Potassium silicate Substances 0.000 claims description 13
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 13
- 235000019353 potassium silicate Nutrition 0.000 claims description 13
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 13
- 239000002480 mineral oil Substances 0.000 claims description 12
- 235000010446 mineral oil Nutrition 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 9
- 229910002011 hydrophilic fumed silica Inorganic materials 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 claims description 3
- 229910052912 lithium silicate Inorganic materials 0.000 claims description 3
- 239000013530 defoamer Substances 0.000 claims 2
- 230000008719 thickening Effects 0.000 abstract description 3
- 239000003973 paint Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 16
- 238000004062 sedimentation Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010008 shearing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 101100490716 Escherichia coli (strain K12) aidB gene Proteins 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000004482 other powder Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000013112 stability test Methods 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
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
-
- 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
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
-
- 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
-
- 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
- C09D7/65—Additives macromolecular
Abstract
The invention discloses an anti-sagging water-based inorganic zinc-rich coating and a preparation method thereof. The anti-sagging water-based inorganic zinc-rich coating comprises a component A and a component B; the component A comprises the following components in parts by mass: 7.5-8.5 parts of water, 0.1-0.3 part of rheological additive A, 4-6 parts of aqueous organic resin, 15-17 parts of aqueous inorganic resin and 0.2-0.5 part of defoaming agent; the component B comprises the following components in parts by mass: 50-65 parts of zinc powder, 5-20 parts of zinc imitation powder and 1-2 parts of rheological additive B; the rheological additive A is cellulose, and the rheological additive B is fumed silica. In order to solve the anti-sagging property of the water-based inorganic zinc-rich coating, two rheological additives, namely cellulose and fumed silica, are compounded; on one hand, the anti-sagging performance of the coating is improved by utilizing the better thickening response of the cellulose to the water-based organic resin in the component A; on the other hand, the similar structure of the fumed silica and the water-based inorganic resin is utilized to enable the fumed silica and the water-based inorganic resin to form intermolecular acting force more easily, and the anti-sagging performance of the water-based inorganic zinc-rich coating is improved.
Description
Technical Field
The invention belongs to the technical field of water-based paint, and particularly relates to anti-sagging water-based inorganic zinc-rich paint and a preparation method thereof.
Background
The water-based paint with the zinc content in the solid part, namely the mass fraction of zinc being more than or equal to 60 percent, is called water-based zinc-rich paint, and the zinc-rich paint prepared by water-based inorganic resin is called water-based inorganic zinc-rich paint. According to standard HG/T3668-2020 zinc-rich primer, the solid content of the water-based inorganic zinc-rich coating is equal to or more than 70%.
At present, the water-based inorganic zinc-rich coating is a two-component coating, wherein the component A is water-based inorganic resin, namely silicate resin, or a mixture of inorganic resin and organic resin, and also contains part of functional auxiliary agents, and the component B is zinc powder or a mixture of the zinc powder and substitutes thereof, and other powder materials can be added under the condition that the solid content and the zinc content are not influenced. Generally, the solid content of the water-based inorganic resin is 20% -45%, so that the solid content of the water-based inorganic zinc-rich coating is more than or equal to 70%, the zinc content is more than or equal to 60%, and a large amount of component B is required to be added during formula design. When the water-based inorganic zinc-rich coating is constructed, the component A and the component B are required to be mixed on a construction site, the mixture is uniformly stirred under the condition of high shearing, the stirring time is at least 15min, and then the mixture is filtered, and the coating is constructed within the working life after the filtration. The pot life of the general water-based inorganic zinc-rich coating is 4 h.
The common formula design of the water-based inorganic zinc-rich coating is that the component A is a water-based resin solution, and the component B is powder. When the water paint is used, the liquid paint needs to be kept in a uniform state to ensure the performance of the paint, but because the water inorganic zinc-rich paint contains a large amount of powder, the A, B components are mixed, so that the sedimentation phenomenon is very easy to be found in the pot life, and after the water paint is used, the sagging phenomenon is easy to occur or the water paint cannot be thickly coated, and the wet film is too thick and is easy to sag. Therefore, in the practical construction environment, in order to ensure the performance of the inorganic zinc-rich coating, the high-thickness construction of the inorganic zinc-rich coating is multiple-pass construction, and the thickness of each pass of construction is not more than 60 mu m.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the anti-sagging water-based inorganic zinc-rich coating and the preparation method thereof. The anti-sagging water-based inorganic zinc-rich coating has the mass solid content of more than 76.7 percent, does not sag after being sprayed for 200 mu m once, and has obvious anti-sagging effect.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the anti-sagging water-based inorganic zinc-rich coating comprises a component A and a component B; the component A comprises the following components in parts by mass: 7.5-8.5 parts of water, 0.1-0.3 part of rheological additive A, 4-6 parts of aqueous organic resin, 15-17 parts of aqueous inorganic resin and 0.2-0.5 part of defoaming agent; the component B comprises the following components in parts by mass: 50-65 parts of zinc powder, 5-20 parts of zinc imitation powder and 1-2 parts of rheological additive B; the rheological additive A is cellulose, and the rheological additive B is fumed silica.
In order to solve the anti-sagging performance of the water-based inorganic zinc-rich coating, the anti-sagging problem of the coating is solved by compounding two rheological additives, namely cellulose and fumed silica. Firstly, cellulose is powder and can form an aqueous solution only by high-speed shearing, but the two components of the aqueous inorganic zinc-rich coating are mixed and stirred when in use, and the shearing force of stirring is not enough to enable the cellulose to form the aqueous solution, so the cellulose is added into the component A, and the anti-sagging performance of the coating can be improved by utilizing the better thickening response of the cellulose to the aqueous organic resin in the component A. Secondly, the aqueous inorganic resin is generally sodium silicate resin, potassium silicate resin, lithium silicate resin, whose molecular formula is MaOb·nSiO2·mH2O, wherein M represents metal ions, the aqueous inorganic resin exists in an ionic state in a liquid state, and can react to form a polymer when being dried into a film, and the molecular structure of the polymer is very similar to that of silicon dioxide. Therefore, the fumed silica is used as the rheological additive in the invention, so that water can be ledThe intermolecular acting force is formed more easily by the inorganic resin and the fumed silica, and the anti-sagging performance of the water-based inorganic zinc-rich coating is improved. Finally, the rheological additive of the component A is combined with the rheological additive of the component B, so that the anti-sagging performance of the coating is further improved.
As a preferred embodiment of the present invention, the fumed silica is a hydrophilic type fumed silica having a specific surface area of 300. + -. 25m2/g。
In a preferred embodiment of the present invention, the aqueous organic resin is an aqueous acrylic resin, and the solid content of the aqueous acrylic resin is not less than 48%.
In a preferred embodiment of the present invention, the aqueous inorganic resin is an aqueous inorganic potassium silicate resin and/or an aqueous inorganic lithium silicate resin, and has a modulus of 3.3 to 6.0 and a mass solid content of 20 to 45%.
The higher the modulus of the aqueous inorganic resin, the better the neutral salt spray resistance, but the higher the modulus, the less favorable the film formation.
As a preferred embodiment of the present invention, the defoaming agent is a mineral oil-based aqueous defoaming agent.
As a preferred embodiment of the invention, the zinc imitation powder is ferrophosphorus powder.
The ferrophosphorus powder is odorless dark gray powder with an irregular structure with edges and corners, has certain acid resistance and alkali resistance at normal temperature, and has good electric and thermal conductivity and outstanding salt fog resistance. The invention uses the ferrophosphorus powder to replace partial zinc powder, reduces the content of the zinc powder, can still keep the excellent anti-corrosion performance, and simultaneously greatly reduces the cost of the anti-sagging water-based inorganic zinc-rich coating. The ferrophosphorus powder can improve the strength and hardness of the coating, play a certain shielding role, and simultaneously improve the cathodic protection efficiency and the corrosion resistance through the conductivity.
In a preferred embodiment of the invention, when the anti-sagging water-based inorganic zinc-rich coating is used, the mass ratio of the component A to the component B is 3: 7.
The preparation method of the anti-sagging water-based inorganic zinc-rich coating comprises the following steps:
(1) uniformly mixing water, a rheological additive A, aqueous organic resin, aqueous inorganic resin and a defoaming agent to obtain a component A;
(2) uniformly mixing zinc powder, zinc imitation powder and rheological additive B to obtain component B;
(3) and stirring the component A and the component B, uniformly mixing, and filtering to obtain the anti-sagging water-based inorganic zinc-rich coating.
Compared with the prior art, the invention has the following beneficial effects: in order to solve the anti-sagging property of the water-based inorganic zinc-rich coating, two rheological additives, namely cellulose and fumed silica, are compounded. Firstly, the anti-sagging performance of the coating can be improved by utilizing the better thickening response of the cellulose to the aqueous organic resin in the component A. Secondly, the hydrophilic fumed silica and the water-based inorganic resin have very similar structures, so that intermolecular acting force can be formed between the water-based inorganic resin and the fumed silica more easily, and the rheological property of the water-based inorganic zinc-rich coating is improved. Finally, the rheological additive of the component A is combined with the rheological additive of the component B, so that the anti-sagging performance of the coating is synergistically improved.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
The anti-sagging water-based inorganic zinc-rich coating comprises a component A and a component B; the mass ratio of the component A to the component B is 3: 7;
the component A comprises the following components in parts by mass: 8.5 parts of water, 0.1 part of rheological additive A, 4 parts of aqueous organic resin, 17 parts of aqueous inorganic resin and 0.4 part of defoaming agent; the rheological additive A is cellulose, the aqueous organic resin is aqueous acrylic resin, and the solid content of the aqueous organic resin is 48%; the water-based inorganic resin is water-based inorganic potassium silicate resin, the modulus is 3.3, and the mass fraction is 45%; the defoaming agent is mineral oil aqueous defoaming agent;
the component B comprises the following components in parts by mass: 50 parts of zinc powder, 18 parts of zinc imitation powder and 2 parts of rheological additive B; the rheological aidB is hydrophilic fumed silica with a specific surface area of 300 +/-25 m2(ii)/g; the zinc imitation powder is ferrophosphorus powder.
The preparation method of the anti-sagging water-based inorganic zinc-rich coating comprises the following steps:
(1) uniformly mixing water, a rheological additive A, aqueous organic resin, aqueous inorganic resin and a defoaming agent to obtain a component A;
(2) uniformly mixing zinc powder, zinc imitation powder and rheological additive B to obtain component B;
(3) stirring the component A and the component B for at least 15min, uniformly mixing, and filtering to obtain the anti-sagging water-based inorganic zinc-rich coating.
Example 2
The anti-sagging water-based inorganic zinc-rich coating comprises a component A and a component B; the mass ratio of the component A to the component B is 3: 7;
the component A comprises the following components in parts by mass: 8.5 parts of water, 0.3 part of rheological additive A, 6 parts of aqueous organic resin, 15 parts of aqueous inorganic resin and 0.2 part of defoaming agent; the rheological additive A is cellulose, the aqueous organic resin is aqueous acrylic resin, and the solid content of the aqueous organic resin is 48%; the water-based inorganic resin is water-based inorganic potassium silicate resin, the modulus is 5.6, and the mass fraction is 25%; the defoaming agent is mineral oil aqueous defoaming agent;
the component B comprises the following components in parts by mass: 65 parts of zinc powder, 4 parts of zinc imitation powder and 1 part of rheological additive B; the rheological additive B is hydrophilic fumed silica, and the specific surface area is 300 +/-25 m2(ii)/g; the zinc imitation powder is ferrophosphorus powder.
The preparation method of the anti-sagging water-based inorganic zinc-rich coating is the same as that of example 1.
Example 3
The anti-sagging water-based inorganic zinc-rich coating comprises a component A and a component B; the mass ratio of the component A to the component B is 3: 7;
the component A comprises the following components in parts by mass: 7.5 parts of water, 0.2 part of rheological additive A, 5 parts of water-based organic resin, 16.8 parts of water-based inorganic resin and 0.5 part of defoaming agent; the rheological additive A is cellulose, the aqueous organic resin is aqueous acrylic resin, and the solid content of the aqueous organic resin is 48%; the water-based inorganic resin is water-based inorganic potassium silicate resin, the modulus is 5.0, and the mass fraction is 30%; the defoaming agent is mineral oil aqueous defoaming agent;
the component B comprises the following components in parts by mass: 60 parts of zinc powder, 8.5 parts of zinc imitation powder and 1.5 parts of rheological additive B; the rheological additive B is hydrophilic fumed silica, and the specific surface area is 300 +/-25 m2(ii)/g; the zinc imitation powder is ferrophosphorus powder.
The preparation method of the anti-sagging water-based inorganic zinc-rich coating is the same as that of example 1.
Comparative example 1
The sag resistant aqueous inorganic zinc-rich coating of the present comparative example comprises component a and component B; the mass ratio of the component A to the component B is 3: 7;
the component A comprises the following components in parts by mass: 8.5 parts of water, 4 parts of aqueous organic resin, 17 parts of aqueous inorganic resin and 0.4 part of defoaming agent; the water-based organic resin is water-based acrylic resin, and the solid content of the water-based organic resin is 48 percent; the water-based inorganic resin is water-based inorganic potassium silicate resin, the modulus is 3.3, and the mass fraction is 45%; the defoaming agent is mineral oil aqueous defoaming agent;
the component B comprises the following components in parts by mass: 50 parts of zinc powder and 18 parts of zinc imitation powder; the zinc imitation powder is ferrophosphorus powder.
The preparation method of the anti-sagging water-based inorganic zinc-rich coating comprises the following steps:
(1) uniformly mixing water, aqueous organic resin, aqueous inorganic resin and a defoaming agent to obtain a component A;
(2) uniformly mixing zinc powder and zinc imitation powder to obtain a component B;
(3) stirring the component A and the component B for at least 15min, uniformly mixing, and filtering to obtain the anti-sagging water-based inorganic zinc-rich coating.
Comparative example 2
The sag resistant aqueous inorganic zinc-rich coating of the present comparative example comprises component a and component B; the mass ratio of the component A to the component B is 3: 7;
the component A comprises the following components in parts by mass: 8.5 parts of water, 0.1 part of rheological additive A, 4 parts of aqueous organic resin, 17 parts of aqueous inorganic resin and 0.4 part of defoaming agent; the rheological additive A is cellulose, the aqueous organic resin is aqueous acrylic resin, and the solid content of the aqueous organic resin is 48%; the water-based inorganic resin is water-based inorganic potassium silicate resin, the modulus is 3.3, and the mass fraction is 45%; the defoaming agent is mineral oil aqueous defoaming agent;
the component B comprises the following components in parts by mass: 50 parts of zinc powder and 18 parts of zinc imitation powder; the zinc imitation powder is ferrophosphorus powder.
The preparation method of the anti-sagging water-based inorganic zinc-rich coating comprises the following steps:
(1) uniformly mixing water, aqueous organic resin, aqueous inorganic resin, a rheological additive A and a defoaming agent to obtain a component A;
(2) uniformly mixing zinc powder and zinc imitation powder to obtain a component B;
(3) stirring the component A and the component B for at least 15min, uniformly mixing, and filtering to obtain the anti-sagging water-based inorganic zinc-rich coating.
Comparative example 3
The sag resistant aqueous inorganic zinc-rich coating of the present comparative example comprises component a and component B; the mass ratio of the component A to the component B is 3: 7;
the component A comprises the following components in parts by mass: 8.5 parts of water, 4 parts of aqueous organic resin, 17 parts of aqueous inorganic resin and 0.4 part of defoaming agent; the water-based organic resin is water-based acrylic resin, and the solid content of the water-based organic resin is 48 percent; the water-based inorganic resin is water-based inorganic potassium silicate resin, the modulus is 3.3, and the mass fraction is 45%; the defoaming agent is mineral oil aqueous defoaming agent;
the component B comprises the following components in parts by mass: 50 parts of zinc powder, 18 parts of zinc imitation powder and 2 parts of rheological additive B; the rheological additive B is hydrophilic fumed silica, and the specific surface area is 300 +/-25 m2(ii)/g; the zinc imitation powder is ferrophosphorus powder.
The preparation method of the anti-sagging water-based inorganic zinc-rich coating comprises the following steps:
(1) uniformly mixing water, aqueous organic resin, aqueous inorganic resin and a defoaming agent to obtain a component A;
(2) uniformly mixing zinc powder, zinc imitation powder and rheological additive B to obtain component B;
(3) stirring the component A and the component B for at least 15min, uniformly mixing, and filtering to obtain the anti-sagging water-based inorganic zinc-rich coating.
Comparative example 4
The anti-sagging water-based inorganic zinc-rich coating comprises a component A and a component B; the mass ratio of the component A to the component B is 3: 7;
the component A comprises the following components in parts by mass: 8.5 parts of water, 0.1 part of rheological additive A, 4 parts of aqueous organic resin, 17 parts of aqueous inorganic resin and 0.4 part of defoaming agent; the rheological additive A is cellulose, the aqueous organic resin is aqueous acrylic resin, and the solid content of the aqueous organic resin is 48%; the water-based inorganic resin is water-based inorganic potassium silicate resin, the modulus is 3.3, and the mass fraction is 45%; the defoaming agent is mineral oil aqueous defoaming agent;
the component B comprises the following components in parts by mass: 50 parts of zinc powder, 18 parts of zinc imitation powder and 2 parts of rheological additive B; the rheological additive B is hydrophobic fumed silica with a specific surface area of 300 +/-25 m2(ii)/g; the zinc imitation powder is ferrophosphorus powder.
The preparation method of the anti-sagging water-based inorganic zinc-rich coating comprises the following steps:
(1) uniformly mixing water, a rheological additive A, aqueous organic resin, aqueous inorganic resin and a defoaming agent to obtain a component A;
(2) uniformly mixing zinc powder, zinc imitation powder and rheological additive B to obtain component B;
(3) stirring the component A and the component B for at least 15min, uniformly mixing, and filtering to obtain the anti-sagging water-based inorganic zinc-rich coating.
Comparative example 5
The anti-sagging water-based inorganic zinc-rich coating comprises a component A and a component B; the mass ratio of the component A to the component B is 3: 7;
the component A comprises the following components in parts by mass: 8.5 parts of water, 0.1 part of rheological additive A, 4 parts of aqueous organic resin, 17 parts of aqueous inorganic resin and 0.4 part of defoaming agent; the rheological additive A is cellulose, the aqueous organic resin is aqueous acrylic resin, and the solid content of the aqueous organic resin is 48%; the water-based inorganic resin is water-based inorganic potassium silicate resin, the modulus is 3.3, and the mass fraction is 45%; the defoaming agent is mineral oil aqueous defoaming agent;
the component B comprises the following components in parts by mass: 50 parts of zinc powder, 18 parts of zinc imitation powder and 2 parts of rheological additive B; the rheological additive B is mica iron ash with the specific surface area of 300 +/-25 m2(ii)/g; the zinc imitation powder is ferrophosphorus powder.
The preparation method of the anti-sagging water-based inorganic zinc-rich coating comprises the following steps:
(1) uniformly mixing water, a rheological additive A, aqueous organic resin, aqueous inorganic resin and a defoaming agent to obtain a component A;
(2) uniformly mixing zinc powder, zinc imitation powder and rheological additive B to obtain component B;
(3) stirring the component A and the component B for at least 15min, uniformly mixing, and filtering to obtain the anti-sagging water-based inorganic zinc-rich coating.
Comparative example 6
The anti-sagging water-based inorganic zinc-rich coating comprises a component A and a component B; the mass ratio of the component A to the component B is 3: 7;
the component A comprises the following components in parts by mass: 8.5 parts of water, 0.5 part of rheological additive A, 4 parts of aqueous organic resin, 17 parts of aqueous inorganic resin and 0.4 part of defoaming agent; the rheological additive A is cellulose, the aqueous organic resin is aqueous acrylic resin, and the solid content of the aqueous organic resin is 48%; the water-based inorganic resin is water-based inorganic potassium silicate resin, the modulus is 3.3, and the mass fraction is 45%; the defoaming agent is mineral oil aqueous defoaming agent;
the component B comprises the following components in parts by mass: 50 parts of zinc powder, 18 parts of zinc imitation powder and 0.1 part of rheological additive B; the rheological additive B is hydrophilic fumed silica, and the specific surface area is 300 +/-25 m2(ii)/g; the zinc imitation powder is ferrophosphorus powder.
The preparation method of the anti-sagging water-based inorganic zinc-rich coating is the same as that of example 1.
Comparative example 7
The anti-sagging water-based inorganic zinc-rich coating comprises a component A and a component B; the mass ratio of the component A to the component B is 3: 7;
the component A comprises the following components in parts by mass: 8.5 parts of water, 0.5 part of rheological additive A, 4 parts of aqueous organic resin, 17 parts of aqueous inorganic resin and 0.4 part of defoaming agent; the rheological additive A is cellulose, the aqueous organic resin is aqueous acrylic resin, and the solid content of the aqueous organic resin is 48%; the water-based inorganic resin is water-based inorganic potassium silicate resin, the modulus is 3.3, and the mass fraction is 45%; the defoaming agent is mineral oil aqueous defoaming agent;
the component B comprises the following components in parts by mass: 50 parts of zinc powder, 18 parts of zinc imitation powder and 2.5 parts of rheological additive B; the rheological additive B is hydrophilic fumed silica, and the specific surface area is 300 +/-25 m2(ii)/g; the zinc imitation powder is ferrophosphorus powder.
The preparation method of the anti-sagging water-based inorganic zinc-rich coating is the same as that of example 1.
Test example: performance testing
The sag resistant aqueous inorganic zinc-rich coatings prepared in examples 1-3 and comparative examples 1-7 were subjected to sag resistance, degree of settling, mass solids, and zinc content tests.
The anti-sagging performance test method comprises the following steps: measuring by using a sagging instrument, and measuring a sagging result according to GB 9264-88;
the method for testing the sedimentation degree comprises the following steps: the anti-sagging water-based inorganic zinc-rich coating is kept stand for 4 hours and then graded according to the settlement degree evaluation method in the standard GB-T6753.3 paint storage stability test method.
TABLE 1 Performance test results of anti-sagging aqueous inorganic zinc-rich coatings described in examples 1-3, comparative examples 1-7
Remarking: according to the standard of zinc-rich paint, the zinc content is more than or equal to 60 percent, and the solid content is more than or equal to 70 percent.
According to the results of table 1, the sag resistant aqueous inorganic zinc-rich coating materials described in the examples of the present invention have excellent sag resistance and sedimentation degree compared to the comparative examples. According to the results of comparative examples 1 to 3 and examples, the anti-sagging water-based inorganic zinc-rich coating obtained by compounding two rheological additives of cellulose and fumed silica has excellent anti-sagging performance and sedimentation degree, and the anti-sagging performance and sedimentation degree of the coating lacking either one of them are reduced. From the results of comparative examples 4 to 5 and examples, it is understood that the hydrophilic fumed silica can improve the sag resistance and the degree of settling of the sag resistant aqueous inorganic zinc-rich coating. According to the results of the comparative examples 6 to 7 and the examples, the addition amount of the cellulose has a large influence on the performance of the anti-sagging water-based inorganic zinc-rich paint of the present invention, and the anti-sagging performance and the sedimentation degree of the paint are reduced when the addition amount is too small; the addition amount is too high, and the coating does not meet the standard of zinc-rich paint.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the true spirit and scope of the present invention.
Claims (8)
1. The anti-sagging water-based inorganic zinc-rich coating is characterized by comprising a component A and a component B; the component A comprises the following components in parts by mass: 7.5-8.5 parts of water, 0.1-0.3 part of rheological additive A, 4-6 parts of aqueous organic resin, 15-17 parts of aqueous inorganic resin and 0.2-0.5 part of defoaming agent; the component B comprises the following components in parts by mass: 50-65 parts of zinc powder, 5-20 parts of zinc imitation powder and 1-2 parts of rheological additive B; the rheological additive A is cellulose, and the rheological additive B is fumed silica.
2. The sag-resistant aqueous inorganic zinc-rich coating of claim 1, wherein the fumed silica is a hydrophilic fumed silica, a specific surfaceThe area is 300 +/-25 m2/g。
3. The sag-resistant aqueous inorganic zinc-rich coating according to claim 1, wherein the aqueous organic resin is an aqueous acrylic resin, and the solid content of the aqueous acrylic resin is not less than 48%.
4. The anti-sagging aqueous inorganic zinc-rich coating of claim 1, wherein the aqueous inorganic resin is an aqueous inorganic potassium silicate resin and/or an aqueous inorganic lithium silicate resin, the modulus is 3.3 to 6.0, and the mass fraction is 20% to 45%.
5. The anti-sag aqueous inorganic zinc-rich coating of claim 1, wherein the defoamer is a mineral oil type aqueous defoamer.
6. The anti-sagging aqueous inorganic zinc-rich coating of claim 1, wherein the zinc imitation powder is a ferrophosphorus powder.
7. The anti-sag aqueous inorganic zinc-rich coating according to claim 1, wherein the mass ratio of component a to component B is 3: 7.
8. The method for preparing the anti-sagging aqueous inorganic zinc-rich coating of any one of claims 1 to 7, comprising the steps of:
(1) uniformly mixing water, a rheological additive A, aqueous organic resin, aqueous inorganic resin and a defoaming agent to obtain a component A;
(2) uniformly mixing zinc powder, zinc imitation powder and rheological additive B to obtain component B;
(3) and stirring the component A and the component B, uniformly mixing, and filtering to obtain the anti-sagging water-based inorganic zinc-rich coating.
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