CN117659781A - Water-based acrylic coating and preparation method and application thereof - Google Patents
Water-based acrylic coating and preparation method and application thereof Download PDFInfo
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- CN117659781A CN117659781A CN202311500708.9A CN202311500708A CN117659781A CN 117659781 A CN117659781 A CN 117659781A CN 202311500708 A CN202311500708 A CN 202311500708A CN 117659781 A CN117659781 A CN 117659781A
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- 238000000576 coating method Methods 0.000 title claims abstract description 150
- 239000011248 coating agent Substances 0.000 title claims abstract description 132
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 77
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims abstract description 38
- 239000000049 pigment Substances 0.000 claims abstract description 53
- 239000003973 paint Substances 0.000 claims abstract description 48
- 239000000945 filler Substances 0.000 claims abstract description 47
- 239000002562 thickening agent Substances 0.000 claims abstract description 44
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 43
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 43
- 239000002270 dispersing agent Substances 0.000 claims abstract description 32
- 239000002994 raw material Substances 0.000 claims abstract description 32
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 13
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 12
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical group [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 22
- 239000013530 defoamer Substances 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 13
- -1 alcohol ester Chemical class 0.000 claims description 11
- 235000010288 sodium nitrite Nutrition 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 8
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical compound CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 claims description 6
- CUVLMZNMSPJDON-UHFFFAOYSA-N 1-(1-butoxypropan-2-yloxy)propan-2-ol Chemical compound CCCCOCC(C)OCC(C)O CUVLMZNMSPJDON-UHFFFAOYSA-N 0.000 claims description 5
- 229940058020 2-amino-2-methyl-1-propanol Drugs 0.000 claims description 5
- CBTVGIZVANVGBH-UHFFFAOYSA-N aminomethyl propanol Chemical compound CC(C)(N)CO CBTVGIZVANVGBH-UHFFFAOYSA-N 0.000 claims description 5
- 239000003112 inhibitor Substances 0.000 claims description 5
- 239000003002 pH adjusting agent Substances 0.000 claims description 5
- IBLKWZIFZMJLFL-UHFFFAOYSA-N 1-phenoxypropan-2-ol Chemical compound CC(O)COC1=CC=CC=C1 IBLKWZIFZMJLFL-UHFFFAOYSA-N 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 2
- 229920000570 polyether Polymers 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 229940083608 sodium hydroxide Drugs 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 15
- 239000007769 metal material Substances 0.000 abstract description 4
- 239000002585 base Substances 0.000 description 17
- 239000011347 resin Substances 0.000 description 17
- 229920005989 resin Polymers 0.000 description 17
- 238000000034 method Methods 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 15
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- 239000000654 additive Substances 0.000 description 9
- 230000000996 additive effect Effects 0.000 description 9
- 238000001914 filtration Methods 0.000 description 9
- 238000003756 stirring Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 6
- 239000011247 coating layer Substances 0.000 description 6
- 239000010433 feldspar Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- UEEJHVSXFDXPFK-UHFFFAOYSA-O N-dimethylethanolamine Chemical compound C[NH+](C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-O 0.000 description 5
- 239000012972 dimethylethanolamine Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical group [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
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- 239000007788 liquid Substances 0.000 description 4
- 239000002932 luster Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
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- 230000004069 differentiation Effects 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
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- 239000002023 wood Substances 0.000 description 2
- 241001396798 Aldama Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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- 238000005536 corrosion prevention Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical group 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
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
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- 229920000647 polyepoxide Polymers 0.000 description 1
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- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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- 230000003746 surface roughness Effects 0.000 description 1
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Abstract
The invention discloses a water-based acrylic acid coating, a preparation method and application thereof, and belongs to the technical field of water-based coatings. The water-based acrylic acid coating provided by the invention comprises the following preparation raw materials in parts by mass: 18 to 32 parts of water-based acrylic resin, 0.5 to 8 parts of pigment, 40 to 65 parts of filler, 5 to 30 parts of water, 0.05 to 0.8 part of thickener, 0.3 to 1.5 parts of dispersing agent, 0.3 to 1.5 parts of defoaming agent and 0.8 to 1.8 parts of film forming auxiliary agent; the pigment-base ratio of the paint is 4.2-5.2. The invention adopts the aqueous acrylic acid coating with high pigment-base ratio from three angles of improving the hardness of the coating, constructing a rough surface and reducing the cohesive force of the coating, can effectively improve the hardness of the coating, reduce the contact area of the coating after being clung, and reduce the surface acting force and cohesive force, thereby preventing the adhesion of the aqueous acrylic acid coating when being stacked and contacted, improving the anti-adhesion effect of the aqueous acrylic acid coating, and having wide application in material protection, especially metal material protection.
Description
Technical Field
The invention belongs to the technical field of water-based paint, and particularly relates to a water-based acrylic paint, and a preparation method and application thereof.
Background
In the field of light corrosion prevention, at present, a phenomenon that components on which coating is constructed are stacked after being dried for a short time exists commonly. In particular to the field of net racks, the packing mode is that a large number of net racks are stacked and bound together. The components in this form are stacked and under the action of gravity or external binding, the coatings on the surfaces of the components will fit tightly together due to the strong external forces. The coating commonly used in this field is currently an aqueous one-component acrylic coating. The aqueous acrylic resin, due to its hot-tack, cold-friable nature, can allow the coating to be applied tightly together, creating a greater force. Under such conditions, when the stacked members are separated by an external force, there is a phenomenon in which the aqueous acrylic paint on the substrate on one side peels off and the substrate bottom having metallic luster is exposed by the coating layer due to the external force.
The main reason for this phenomenon is that the paint has a certain adhesive force after the two net racks or the two components are respectively coated. When the components are stacked, three forces exist as a whole, namely adhesion between the coating and the substrate, cohesion inside the coating and acting force generated by the coating on the surfaces of two components.
However, the coating thickness, the film forming effect and the treatment degree of the base material of the water-based paint are different, so that the adhesion force of the same paint on the same type of components is different to a certain extent. When the components are stacked, the coatings on the surfaces of the two components are mutually attached, and a huge acting force is generated between the coatings, wherein the acting force is often larger than the cohesive force of the coatings and larger than the adhesive force between the coatings and the substrate. When the two base materials are separated by external force, the base material with weak coating adhesion force is peeled off by the external force, and the base material exposes metallic luster.
The current thought of solving this problem is basically consistent, and the solutions are very similar, including increasing the hardness of the resin and increasing the smoothness of the coating surface. For example, blending with an acrylic resin and a silicone resin; mixing and splicing the water-based acrylic resin and the water-based epoxy ester resin; mixing and splicing the aqueous acrylic resin and silica sol; high Tg acrylic resin, aqueous epoxy resin emulsion, silica sol blending and the like. The existing technical route improves the hardness of the coating from the angle of resin, thereby playing the role of anti-adhesion, but the anti-adhesion effect is more general.
Disclosure of Invention
In order to overcome the problems of the prior art, one of the purposes of the present invention is to provide an aqueous acrylic coating which has a good anti-blocking effect.
The second purpose of the invention is to provide a preparation method of the water-based acrylic paint.
The invention also aims to provide an application of the water-based acrylic paint.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the first aspect of the invention provides a water-based acrylic paint, which comprises the following preparation raw materials in parts by mass: 18 to 32 parts of water-based acrylic resin, 0.5 to 8 parts of pigment, 40 to 65 parts of filler, 5 to 30 parts of water, 0.05 to 0.8 part of thickener, 0.3 to 1.5 parts of dispersing agent, 0.3 to 1.5 parts of defoaming agent and 0.8 to 1.8 parts of film forming auxiliary agent; the pigment-base ratio of the paint is 4.2-5.2.
The invention is characterized in that: the anti-blocking effect of the aqueous acrylic paint is effectively improved by combining the three methods of improving the hardness of the paint, constructing a rough surface and reducing the cohesive force of the paint. Firstly, the invention adopts the coating with high pigment base ratio, which is beneficial to improving the hardness of the coating. Pigment-to-base ratio refers to the ratio of pigment to filler, and base to neat resin (typically the added resin is water or solvent-containing, and is solid-borne and should be multiplied by the solid-borne content during calculation). The resin in the paint has the functions of bonding all the components into a whole, the powder coating capability of the resin is strong, the surface tension of the system is low, the paint has good wettability to pigment and filler, namely, in the paint with high pigment-base ratio, the pigment and filler content is high, and the obtained coating has high hardness and good anti-blocking effect.
Second, the use of high aspect ratio coatings also enables the construction of rough coating surfaces. In the case where the final state of the coating is uneven, when the members coated with the coating film are stacked, the contact area of the coating films with each other is changed from planar face-to-face contact to uneven line-to-line or point-to-point contact, so that the contact area between the coating films is greatly reduced. Since the force between the coatings is the resultant force between the points of action, the smaller the contact area, the smaller the resultant force of action, thus reducing the force between the coatings. When the acting force between the coating layers is far smaller than the adhesive force between the coating layers and the substrate, the coating layer on one member is not torn off due to the fact that the acting force between the coating layers is too large when the member is separated, and therefore the substrate with metallic luster is exposed. That is, the higher the pigment-to-matrix ratio, the more pigment filler is exposed on the surface, the coarser the coating surface is, and the more the anti-blocking property of the coating is improved.
Finally, the use of high aspect ratio coatings is beneficial to reducing the cohesive force of the coating. The more pigment is in the coating with high pigment-base ratio, the less resin is coated on the pigment, so that the cohesive force of the coating is reduced. When the cohesive force is lower than the adhesive force, the cohesive failure probability of the coating can be greatly improved when the two components are separated, and the probability of peeling off the whole coating and exposing the metallic luster of the base material can be reduced.
Preferably, the pigment-based ratio of the paint is 4.22-5.1; more preferably 4.4 to 5.0.
Preferably, in the preparation raw materials of the coating, the Mohs hardness of the filler is more than or equal to 5; more preferably 6 to 7.
Preferably, in the preparation raw materials of the coating, the filler comprises feldspar powder, silica micropowder or a combination thereof.
From the aspect of pigment and filler, the filler with higher hardness is further selected, so that the hardness of the water-based paint is improved, and the anti-adhesion effect is improved. The hardness of the coating is HB, and belongs to the hardness limit of single-component non-modified water-based acrylic paint.
Preferably, in the preparation raw materials of the coating, the minimum film forming temperature of the aqueous acrylic resin is 18-28 ℃; further preferably 20 to 25 ℃.
Preferably, in the preparation raw materials of the coating, the solid content of the aqueous acrylic resin is 44-50wt%; further preferably 46 to 48wt%.
The aqueous acrylic resin has better powder coating capability and can prepare the coating with higher pigment base ratio. The resin with strong powder coating capability is stable when preparing the water-based paint with high pigment base ratio; when the resin with weak powder coating capability is used for preparing the water-based paint with high pigment base ratio, the emulsion breaking phenomenon can occur when the slurry is mixed with the resin, the paint can be directly changed into mud, and the stable water-based paint can not be successfully prepared.
In specific embodiments of the present invention, the aqueous acrylic resin comprises at least one of Luo Sifu 911, constant and 2052 or bard 998A.
Preferably, in the preparation raw material of the coating, the thickener is selected from low-shear thickeners; further preferably, the thickener comprises a low shear polyurethane thickener, a low shear alkali swelling thickener, or a combination thereof.
The low-shear thickening agent can enable the coating to have relatively large thixotropy, the thixotropy can enable the coating to be poor in leveling in the drying process, uneven coating thickness is caused by poor coating flow, a thick coating place is a main contact position, the uneven coating thickness can enable the contact area of the coating to be reduced, and acting force can be reduced. The low-shear thickening agent can further improve the surface roughness of the coating and the anti-blocking performance.
In a specific embodiment of the present invention, the thickener comprises at least one of Wanhua U905, pu H120, or Rogowski 12W.
Conventional pigments, dispersants, defoamers or film forming aids may be used in the present invention.
In a specific embodiment of the present invention, the dispersant comprises at least one of Dow 731a, huihong 2361, aldama BR85, or Basf 4320.
In a specific embodiment of the invention, the defoamer is selected from polyether modified silicone defoamers; in a more specific embodiment of the present invention, the defoamer comprises at least one of Digao 901W, deep bamboo 6791, pick BYK-011 or Pick BYK-024.
In a specific embodiment of the present invention, the film forming aid comprises at least one of alcohol ester twelve, propylene glycol phenyl ether (ppH), dipropylene glycol butyl ether (DPnB).
Preferably, in the preparation raw materials of the coating, the mass parts of the aqueous acrylic resin are 20-30 parts; further preferably 23 to 28 parts.
Preferably, in the preparation raw materials of the paint, the mass part of the pigment is 0.8-6 parts; further preferably 1 to 5 parts.
Preferably, in the preparation raw materials of the coating, the mass part of the filler is 45-60 parts; more preferably 50 to 55 parts.
Preferably, in the preparation raw materials of the coating, the mass part of water is 8-25 parts; more preferably 10 to 20 parts.
Preferably, in the preparation raw materials of the coating, the weight part of the thickener is 0.08-0.6 part; more preferably 0.1 to 0.5 part.
Preferably, in the preparation raw materials of the coating, the mass part of the dispersing agent is 0.4-1.2 parts; more preferably 0.5 to 1 part.
Preferably, in the preparation raw materials of the coating, the mass part of the defoaming agent is 0.4-1.2 parts; more preferably 0.5 to 1 part.
Preferably, in the preparation raw materials of the coating, the mass part of the film forming auxiliary agent is 1-1.5 parts; further preferably 1.1 to 1.4 parts.
Preferably, the water-based acrylic paint comprises the following preparation raw materials in parts by mass: 20 to 30 parts of water-based acrylic resin, 0.8 to 6 parts of pigment, 45 to 60 parts of filler, 8 to 25 parts of water, 0.08 to 0.6 part of thickener, 0.4 to 1.2 parts of dispersing agent, 0.4 to 1.2 parts of defoaming agent and 1 to 1.5 parts of film forming auxiliary agent.
Further preferably, the aqueous acrylic coating comprises the following preparation raw materials in parts by mass: 23 to 28 parts of water-based acrylic resin, 1 to 5 parts of pigment, 50 to 55 parts of filler, 10 to 20 parts of water, 0.1 to 0.5 part of thickener, 0.5 to 1 part of dispersing agent, 0.5 to 1 part of defoaming agent and 1.1 to 1.4 parts of film forming auxiliary agent.
Preferably, the preparation raw materials of the aqueous acrylic coating further comprise a pH regulator, an anti-flash rust agent or a combination thereof; further preferably, the preparation raw materials of the aqueous acrylic coating further comprise a pH regulator and an anti-flash rust agent.
In the present invention, both conventional pH adjusting agents and anti-flash rust agents may be used in the present invention.
In a specific embodiment of the present invention, the pH adjustor comprises at least one of N, N-Dimethylethanolamine (DMEA), 2-amino-2-methyl-1-propanol (AMP-95), or sodium hydroxide.
In a specific embodiment of the present invention, the flash rust inhibitor is selected from sodium nitrite.
Preferably, the coating is prepared from raw materials which do not contain leveling agents. According to the invention, no leveling agent is added, and the coating can have a good anti-adhesion effect under the condition that the hardness of the coating is HB only through the synergistic effect between the preparation raw materials.
Preferably, in the auxiliary agent, the weight part of the pH regulator is 0.3-1.5 part; further preferably 0.4 to 1.2 parts; still more preferably 0.5 to 1 part.
Preferably, in the auxiliary agent, the anti-flash rust agent is 0.03-0.2 part by weight; further preferably 0.05 to 0.15 part; further preferably 0.08 to 0.12 parts.
Preferably, the water-based acrylic paint comprises the following preparation raw materials in parts by mass: 18 to 32 parts of water-based acrylic resin, 0.5 to 8 parts of pigment, 40 to 65 parts of filler, 5 to 30 parts of water, 0.05 to 0.8 part of thickener, 0.3 to 1.5 parts of dispersing agent, 0.3 to 1.5 parts of defoaming agent, 0.8 to 1.8 parts of film forming auxiliary agent, 0.3 to 1.5 parts of pH regulator and 0.03 to 0.2 part of flash rust inhibitor.
Further preferably, the aqueous acrylic coating comprises the following preparation raw materials in parts by mass: 20 to 30 parts of water-based acrylic resin, 0.8 to 6 parts of pigment, 45 to 60 parts of filler, 8 to 25 parts of water, 0.08 to 0.6 part of thickener, 0.4 to 1.2 parts of dispersing agent, 0.4 to 1.2 parts of defoaming agent, 1 to 1.5 parts of film forming auxiliary agent, 0.4 to 1.2 parts of pH regulator and 0.05 to 0.15 part of flash rust inhibitor.
Still more preferably, the aqueous acrylic paint comprises the following preparation raw materials in parts by mass: 23 to 28 parts of water-based acrylic resin, 1 to 5 parts of pigment, 50 to 55 parts of filler, 10 to 20 parts of water, 0.1 to 0.5 part of thickener, 0.5 to 1 part of dispersing agent, 0.5 to 1 part of defoaming agent, 1.1 to 1.4 parts of film forming auxiliary agent, 0.5 to 1 part of pH regulator and 0.08 to 0.12 part of flash rust inhibitor.
The second aspect of the invention provides a preparation method of the water-based acrylic paint, which is characterized by comprising the following steps:
and mixing the preparation raw materials to obtain the water-based acrylic paint.
Preferably, in the preparation method, the mixing sequence of the preparation raw materials is water, a dispersing agent, aqueous acrylic resin, a defoaming agent, pigment, filler, a film forming auxiliary agent and a thickening agent in sequence; further preferably, when the auxiliary agent includes a pH adjuster and an anti-flash rust agent, the mixing order of the respective preparation raw materials is water, a pH adjuster, a dispersant, an anti-flash rust agent, an aqueous acrylic resin, a defoaming agent, a pigment, a filler, a film forming auxiliary agent, and a thickener in this order.
A third aspect of the invention provides the use of the aqueous acrylic paint according to the first aspect of the invention in the protection of materials.
Preferably, the material is selected from metallic materials.
The beneficial effects of the invention are as follows: the invention adopts the aqueous acrylic acid coating with high pigment-base ratio from three angles of improving the hardness of the coating, constructing a rough surface and reducing the cohesive force of the coating, can effectively improve the hardness of the coating, reduce the contact area of the coating after being clung, and reduce the surface acting force and cohesive force, thereby preventing the adhesion of the aqueous acrylic acid coating when being stacked and contacted, improving the anti-adhesion effect of the aqueous acrylic acid coating, and having wide application in material protection, especially metal material protection.
Specifically, compared with the prior art, the invention has the following advantages:
1. the hardness of the coating is improved, not from the perspective of resin, but from the perspective of pigment ratio and filler, the hardness of the filler is far greater than that of the resin, so that the coating improves the pigment ratio to 4.2-5.2, and simultaneously selects the filler with Mohs hardness of 5 or more, and the two aspects cooperate to improve the hardness of the water-based paint and improve the anti-adhesion effect.
2. According to the invention, by constructing the rough surface, the final state of the coating is uneven, so that the contact area between the coatings is greatly reduced, the acting force between the coatings is reduced, and the adhesion and tearing between the coatings are avoided. Specifically, the present invention constructs the roughened surface of the coating by two aspects: the pigment ratio is improved, and the more the powder is, the coarser the surface of the coating is; secondly, a low-shear thickener is used, which can cause the liquid coating to have thixotropic properties, so that the wet film cannot be leveled, and the uneven wet film cannot be rugged.
3. According to the invention, no leveling agent is added, and the coating can have a good anti-adhesion effect under the condition that the hardness of the coating is HB only by the synergistic effect of the method.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It is also to be understood that the following examples are given solely for the purpose of illustration and are not to be construed as limitations on the scope of the invention, since various modifications and adaptations may be made by those skilled in the art in light of the teachings herein. The specific process parameters and the like described below are also merely examples of suitable ranges, i.e., one skilled in the art can make a selection within the suitable ranges by the description herein and are not intended to be limited to the specific data described below. The starting materials, reagents or apparatus used in the following examples and comparative examples were obtained from conventional commercial sources or by known methods unless otherwise specified.
Example 1
An aqueous acrylic paint is prepared by the following method:
adding 11.7 parts of water into a dispersing cylinder in sequence; 0.5 part of pH regulator; 0.5 parts of dispersing agent; 0.1 part of sodium nitrite; 28 parts of aqueous acrylic resin; 0.5 parts of defoamer; 3 parts of pigment; 54 parts of filler; 1.2 parts of film forming additive; 0.5 part of thickener. Stirring uniformly at a high speed, and filtering with 200 meshes to obtain the anti-adhesion water-based acrylic coating. The pigment ratio of the formula is controlled at 4.24.
Wherein the pH regulator is N, N-Dimethylethanolamine (DMEA); the dispersant is ceramic 731a; the defoamer is 901W; the water-based acrylic resin is 911 (ROSF-911) of Luo Sifu, purchased from Guangzhou Luo Sifu new material technology Co., ltd, and is a polymer formed by copolymerizing styrene and acrylic ester, wherein the Minimum Film Forming Temperature (MFFT) is 20 ℃, and the solid content is 48wt%; the filler is feldspar powder; the film forming auxiliary agent is alcohol ester twelve; the thickener is Wanhua U905.
Example 2
An aqueous acrylic paint is prepared by the following method:
17.8 parts of water is sequentially added into the dispersing cylinder; 0.7 part of pH regulator; 0.9 parts of dispersing agent; 0.1 part of sodium nitrite; 23 parts of aqueous acrylic resin; 0.9 parts of defoamer; 1-5 parts of pigment; 50 parts of filler; 1.3 parts of film forming additive; 0.3 parts of thickener. Stirring uniformly at a high speed, and filtering with 200 meshes to obtain the anti-adhesion water-based acrylic coating. The pigment ratio of the formula is controlled at 4.98.
Wherein the pH regulator is sodium hydroxide; the dispersant is a bright iridescent 2361; the defoamer is 6791 of deep bamboo; the water-based acrylic resin is constant 2052, the Minimum Film Forming Temperature (MFFT) is 25 ℃, and the solid content is 48wt%; the filler is silica micropowder; the film forming aid is propylene glycol phenyl ether (ppH); the thickener is commonly H120.
Example 3
An aqueous acrylic paint is prepared by the following method:
adding 16.7 parts of water into a dispersing cylinder in sequence; 1 part of pH regulator; 0.7 parts of dispersing agent; 0.1 part of sodium nitrite; 25 parts of aqueous acrylic resin; 0.7 parts of defoamer; 1 part of pigment; 53 parts of filler; 1.4 parts of film forming additive; 0.4 parts of thickener. Stirring uniformly at a high speed, and filtering with 200 meshes to obtain the anti-adhesion water-based acrylic coating. The pigment ratio of the formula is controlled at 4.5.
Wherein the pH regulator is AMP-95; the dispersant is BR85 of the Acomax; the defoamer is BYK-011, the water-based acrylic resin is Badbafy 998A, the Minimum Film Forming Temperature (MFFT) is 20 ℃, and the solid content is 48wt%; the filler is a mixture of feldspar powder and silicon micropowder, and the adding proportion is 1:1, a step of; the film forming auxiliary agent is dipropylene glycol butyl ether (DPnB); the thickener was 12W of rombin.
Comparative example 1
An aqueous acrylic paint is prepared by the following method:
adding 11.2 parts of water into a dispersing cylinder in sequence; 0.6 part of pH regulator; 0.5 parts of dispersing agent; 0.1 part of sodium nitrite; 28 parts of aqueous acrylic resin; 0.8 parts of defoamer; 5 parts of pigment; 52 parts of filler; 1.4 parts of film forming additive; 0.5 part of thickener. Stirring uniformly at a high speed, and filtering with 200 meshes to obtain the anti-adhesion water-based acrylic coating. The pigment ratio of the formula is controlled at 4.24.
Wherein the aqueous acrylic resin is bard rich 719F; the pH regulator is sodium hydroxide; the dispersant is 4320 of basf; the defoamer is BYK-024 with a certain height; the water-based acrylic resin is Baderfu 719F, the Minimum Film Forming Temperature (MFFT) is 20 ℃, and the solid content is 48wt%; the filler is feldspar powder; the film forming auxiliary agent is alcohol ester twelve; the thickener is Wanhua U905.
The result of comparative example 1 is emulsion breaking, and a uniform liquid coating could not be prepared.
Comparative example 1 selects a resin with insufficient powder coating capability, the pigment ratio cannot reach more than 4.2, and even if the pigment ratio of the formula is controlled to be more than 4.2, the emulsion is demulsified due to the insufficient powder coating capability of the resin, so that the liquid coating with high pigment ratio cannot be prepared.
Comparative example 2
An aqueous acrylic paint is prepared by the following method:
6.3 parts of water is sequentially added into the dispersing cylinder; 1 part of pH regulator; 0.8 parts of dispersing agent; 0.1 part of sodium nitrite; 35 parts of aqueous acrylic resin; 0.9 parts of defoamer; 4 parts of pigment; 50 parts of filler; 1.4 parts of film forming additive; 0.5 part of thickener. Stirring uniformly at a high speed, and filtering with 200 meshes to obtain the anti-adhesion water-based acrylic coating. The pigment ratio of the formula is controlled to be 3.2.
Wherein the pH regulator is N, N-Dimethylethanolamine (DMEA); the dispersant is a bright iridescent 2361; the defoamer is 6791 of deep bamboo; the water-based acrylic resin is constant 2052, the Minimum Film Forming Temperature (MFFT) is 25 ℃, and the solid content is 48wt%; the filler is silica micropowder; the film forming aid is propylene glycol phenyl ether (ppH); the thickener is commonly H120.
Comparative example 2 the pigment ratio of the formulation was reduced and controlled to 3.2.
Comparative example 3
An aqueous acrylic paint is prepared by the following method:
adding 14.8 parts of water into a dispersing cylinder in sequence; 0.9 part of pH regulator; 1 part of dispersing agent; 0.1 part of sodium nitrite; 26 parts of aqueous acrylic resin; 0.6 part of defoaming agent; 1 part of pigment; 54 parts of filler; 1.2 parts of film forming additive; 0.4 parts of thickener. Stirring uniformly at a high speed, and filtering with 200 meshes to obtain the anti-adhesion water-based acrylic coating. The pigment ratio of the formulation was controlled at 4.4.
Wherein the pH regulator is AMP-95; the dispersant is BR85 of the Acomax; the defoamer is BYK-011, the water-based acrylic resin is Badbafy 998A, the Minimum Film Forming Temperature (MFFT) is 20 ℃, and the solid content is 48wt%; the filler is talcum powder, and the adding ratio is 1:1; the film forming auxiliary agent is alcohol ester twelve; the thickener was 12W of rombin.
Comparative example 3 the filler talc having a mohs hardness of 1 was selected, the number of talc being at least 800 mesh.
Comparative example 4
An aqueous acrylic paint is prepared by the following method:
adding 11.7 parts of water into a dispersing cylinder in sequence; 0.5 part of pH regulator; 0.5 parts of dispersing agent; 0.1 part of sodium nitrite; 28 parts of aqueous acrylic resin; 0.5 parts of defoamer; 3 parts of pigment; 54 parts of filler; 1.2 parts of film forming additive; 0.5 part of thickener. Stirring uniformly at a high speed, and filtering with 200 meshes to obtain the anti-adhesion water-based acrylic coating. The pigment ratio of the formulation was controlled at 4.24.
Wherein the pH regulator is N, N-Dimethylethanolamine (DMEA); the dispersant is ceramic 731a; the defoamer is 901W; the water-based acrylic resin is 911 (ROSF-911) of Luo Sifu, purchased from Guangzhou Luo Sifu new material technology Co., ltd, and is a polymer formed by copolymerizing styrene and acrylic ester, wherein the Minimum Film Forming Temperature (MFFT) is 20 ℃, and the solid content is 48wt%; the filler is barium sulfate; the film forming auxiliary agent is alcohol ester twelve; the thickener is Wanhua U905.
Comparative example 4 a filler barium sulfate having a mohs hardness of about 3.5 was selected.
Comparative example 5
An aqueous acrylic paint is prepared by the following method:
adding 11.7 parts of water into a dispersing cylinder in sequence; 0.5 part of pH regulator; 0.5 parts of dispersing agent; 0.1 part of sodium nitrite; 28 parts of aqueous acrylic resin; 0.5 parts of defoamer; 3 parts of pigment; 54 parts of filler; 1.2 parts of film forming additive; 0.5 part of thickener. Stirring uniformly at a high speed, and filtering with 200 meshes to obtain the anti-adhesion water-based acrylic coating. The pigment ratio of the formulation was controlled at 4.24.
Wherein the pH regulator is N, N-Dimethylethanolamine (DMEA); the dispersant is ceramic 731a; the defoamer is 901W; the water-based acrylic resin is 911 (ROSF-911) of Luo Sifu, purchased from Guangzhou Luo Sifu new material technology Co., ltd, and is a polymer formed by copolymerizing styrene and acrylic ester, wherein the Minimum Film Forming Temperature (MFFT) is 20 ℃, and the solid content is 48wt%; the filler is feldspar powder; the film forming auxiliary agent is alcohol ester twelve, and the thickener is RM-2020 of Robin Hasi.
Comparative example 5 the low shear thickener was replaced with a high shear thickener selected as RM-2020 from romnesis.
Comparative example 6
An aqueous acrylic paint is prepared by the following method:
adding 11.2 parts of water into a dispersing cylinder in sequence; 0.6 part of pH regulator; 0.5 parts of dispersing agent; 0.1 part of sodium nitrite; 28 parts of aqueous acrylic resin; 0.8 parts of defoamer; 5 parts of pigment; 52 parts of filler; 1.4 parts of film forming additive; 0.3 to 0.6 percent of organosilicon leveling agent; 0.5 part of thickener. Stirring uniformly at a high speed, and filtering with 200 meshes to obtain the anti-adhesion water-based acrylic coating. The pigment ratio of the formula is controlled at 4.24.
Wherein the aqueous acrylic resin is 998A of Baderfu; the pH regulator is sodium hydroxide; the dispersant is 4320 of basf; the defoamer is BYK-024 with a certain height; the water-based acrylic resin is Baderfu 719F, the Minimum Film Forming Temperature (MFFT) is 20 ℃, and the solid content is 48wt%; the filler is feldspar powder; the film forming auxiliary agent is alcohol ester twelve; the organosilicon leveling agent is BYK-333; the thickener is Wanhua U905.
A leveling agent was added to comparative example 6.
Performance testing
1. Blocking resistance
The wood lacquer has a national anti-adhesion test standard, but the water-based industrial paint of the invention has no national anti-adhesion test standard. According to the test standard of wood lacquer (GB 1762-1980 coating back tack measuring method), the formula in the embodiment of the invention is grade 1, and the differentiation is not high. Thus in a specific embodiment of the invention the test method is improved on the basis of GB 1762-1980 with a very strong differentiation.
The test method of the GB 1762-1980 coating back tack assay is as follows:
the coating was prepared on a tinplate according to the brush coating method of general coating preparation method (GB 1727-79). And drying for 48 hours under the condition of constant temperature and constant humidity after brushing. Placing the filter paper sheet with light surface facing downwards on the coating layer at a position which is not less than 1cm away from the edge of the sample plate, placing the filter paper sheet in a temperature and humidity regulating box, placing a back viscosity tester preheated at the temperature of 40+/-1 ℃ and the relative humidity of 80+/-2% in the center of the filter paper sheet, and closing the temperature and humidity regulating box. The temperature was raised to 40.+ -. 1 ℃ and the relative humidity 80.+ -. 2% within 5 minutes, and the mixture was kept under this condition for 10 minutes. The measuring instrument is quickly taken up vertically and the sample plate is taken out. The mixture was left under constant temperature and humidity for 15 minutes, and the result was observed with a four-fold magnifying glass.
The anti-blocking test method in the specific embodiment of the invention comprises the following steps:
the base material is two cold-rolled steel plates with the thickness of 15 multiplied by 7 multiplied by 0.1cm, and the water-based acrylic paint is prepared by air spraying after alcohol cleaning. The dry film thickness is 60+/-5 mu m; and then curing for 24 hours under standard conditions. Stacking one surfaces of the two templates on which the coating is constructed, placing the two templates in a blast drying oven at 60 ℃, and placing a weight with the weight of 5kg on the cold-rolled sheet; placing at 60 ℃ for 24 hours; after 24 hours, the template was taken out, then the template was separated using an external force, and the area ratio of blocking was observed and estimated.
GB 1762-1980 differs from the test method according to the invention mainly in that: the method has the advantages of shorter curing time (24 hours instead of 48 hours), heavier mass (5 kg), higher oven temperature (60 ℃), larger contact area (15 multiplied by 7 multiplied by 0.1cm cold-rolled steel plate, larger adhesion acting force) and longer oven placing time (24 hours). Therefore, the testing method of the invention is more severe, and the adhesion force between the coatings is larger.
2. Hardness: the hardness of each coating was measured and the hardness of each coating of the examples was HB.
The properties of each coating are summarized in table 1.
Table 1 coating properties of examples 1 to 3 and comparative examples 1 to 5
As shown in Table 1, the aqueous acrylic paint of the example of the present invention has good anti-blocking property and also has good anti-blocking effect under the condition of having only HB.
The hardness of the coating in the embodiment of the invention is improved, not from the perspective of resin, but from the perspective of pigment ratio and filler, the hardness of the filler is far greater than that of the resin, so that the invention improves the pigment ratio to 4.2-5.2, simultaneously selects the filler with the Mohs hardness of 5 or more, and the two aspects cooperate to improve the hardness of the water-based paint and improve the anti-adhesion effect.
In addition, the embodiment of the invention ensures that the final state of the coating is uneven by constructing the rough surface, thereby greatly reducing the contact area between the coatings, reducing the acting force between the coatings and avoiding the adhesion and tearing between the coatings. Specifically, the present embodiments construct a roughened surface of the coating by two aspects: the pigment ratio is improved, and the more the powder is, the coarser the surface of the coating is; secondly, the low-shear thickening agent is used, so that the liquid coating has thixotropic property, the thixotropic property can prevent the wet film from leveling, and the uneven wet film can be uneven.
According to the embodiment of the invention, no leveling agent is added, and the coating can have a good anti-adhesion effect under the condition that the hardness of the coating is HB only by the synergistic effect of the method.
The invention adopts the aqueous acrylic acid coating with high pigment-base ratio from three angles of improving the hardness of the coating, constructing a rough surface and reducing the cohesive force of the coating, can effectively improve the hardness of the coating, reduce the contact area of the coating after being clung, and reduce the surface acting force and cohesive force, thereby preventing the adhesion of the aqueous acrylic acid coating when being stacked and contacted, improving the anti-adhesion effect of the aqueous acrylic acid coating, and having wide application in material protection, especially metal material protection.
Claims (10)
1. The water-based acrylic acid coating is characterized by comprising the following preparation raw materials in parts by weight: 18 to 32 parts of water-based acrylic resin, 0.5 to 8 parts of pigment, 40 to 65 parts of filler, 5 to 30 parts of water, 0.05 to 0.8 part of thickener, 0.3 to 1.5 parts of dispersing agent, 0.3 to 1.5 parts of defoaming agent and 0.8 to 1.8 parts of film forming auxiliary agent; the pigment-base ratio of the paint is 4.2-5.2.
2. The aqueous acrylic coating according to claim 1, wherein the filler has a mohs hardness of 5 or more.
3. The aqueous acrylic coating according to claim 1, wherein the minimum film forming temperature of the aqueous acrylic resin is 18 to 28 ℃;
and/or the solid content of the aqueous acrylic resin is 44-50 wt%.
4. The aqueous acrylic coating according to claim 1, characterized in that the thickener is selected from low shear thickeners;
and/or, the defoamer is selected from polyether modified silicone defoamers;
and/or the film forming auxiliary agent is selected from at least one of alcohol ester twelve, propylene glycol phenyl ether or dipropylene glycol butyl ether.
5. The aqueous acrylic coating according to claim 1, wherein the aqueous acrylic coating is prepared from a raw material further comprising a pH adjuster, an anti-flash rust agent, or a combination thereof.
6. The aqueous acrylic coating of claim 5, wherein the pH adjuster comprises at least one of N, N-dimethylethanolamine, 2-amino-2-methyl-1-propanol, or sodium hydroxide;
and/or, the anti-flash rust agent is selected from sodium nitrite.
7. The aqueous acrylic coating according to claim 1, wherein the raw materials for preparation do not contain a leveling agent.
8. The aqueous acrylic coating according to claim 1, characterized by comprising the following preparation raw materials in parts by mass: 18 to 32 parts of water-based acrylic resin, 0.5 to 8 parts of pigment, 40 to 65 parts of filler, 5 to 30 parts of water, 0.05 to 0.8 part of thickener, 0.3 to 1.5 parts of dispersing agent, 0.3 to 1.5 parts of defoaming agent, 0.8 to 1.8 parts of film forming auxiliary agent, 0.3 to 1.5 parts of pH regulator and 0.03 to 0.2 part of flash rust inhibitor.
9. The method for producing an aqueous acrylic paint according to any one of claims 1 to 8, comprising the steps of:
and mixing the preparation raw materials to obtain the water-based acrylic paint.
10. Use of the aqueous acrylic coating according to any one of claims 1 to 8 for protection of materials.
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