CN112795211A - Wall paint for writing and drawing and preparation method and application thereof - Google Patents
Wall paint for writing and drawing and preparation method and application thereof Download PDFInfo
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- CN112795211A CN112795211A CN202011585221.1A CN202011585221A CN112795211A CN 112795211 A CN112795211 A CN 112795211A CN 202011585221 A CN202011585221 A CN 202011585221A CN 112795211 A CN112795211 A CN 112795211A
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- 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
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- 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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- 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
- C09D5/06—Artists' paints
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Paints Or Removers (AREA)
Abstract
The invention provides a wall paint for writing and drawing, and a preparation method and application thereof, wherein the wall paint for writing and drawing comprises A, B two components, and the preparation raw materials of the component A comprise the following components: titanate and isopropanol; the preparation raw materials of the component B comprise the following components: nano silica sol, a stabilizer, a titanate coupling agent, a thickening agent, alkyl siloxane 1, alkyl siloxane 2 and polydimethylsiloxane; the weight ratio of the component A to the component B is 1: 16-1: 19. The alkyl siloxane/nano-silicon sol system comprehensively ensures the excellent basic performance of the wall paint for writing and drawing, and the addition of the polydimethylsiloxane further reduces the surface tension of the paint and comprehensively improves the writing and erasing performance of the paint; in addition, the wall paint for writing and drawing belongs to a water-based environment-friendly material, has excellent antibacterial durability, high scratch resistance hardness and excellent solvent resistance, and is suitable for being used on the wall surfaces of schools, offices or homes.
Description
Technical Field
The invention belongs to the technical field of functional materials for decorating inner walls of buildings, and relates to a wall coating for writing and drawing, and a preparation method and application thereof.
Background
At present, a plurality of white board wall paints for manufacturing writing and drawing walls on the wall surface on site exist, and although some problems are solved, the white board wall paints cannot fundamentally meet the actual requirements of users, such as: the white board handwriting has long retention time, and the dry cotton cloth cannot be erased; the watercolor handwriting and the dry cotton cloth can not be erased, and even the waterless alcohol can not be erased; the oily handwriting can not be wiped clean by absolute alcohol, and obvious marks are left. These are the most troublesome problems in the actual use process of users, and are also the problems that users expect to solve.
CN103045045A discloses a water-based white board wall paint which has the anti-graffiti performance of a solvent-based paint, is a water-soluble environment-friendly paint and has extremely low VOB, is easy to operate, meets the environment-friendly requirement, and achieves the purposes of environment protection, energy conservation and emission reduction. The technical scheme of the invention is as follows: the water-based white board wall paint comprises a component A and a component B, wherein the component A and the component B are mixed according to the mass ratio of 1:3-6, and the water-based white board wall paint is obtained by uniformly stirring. The invention effectively solves the problem that a white board is required to be hung on the wall of a school, an office or a house for leaving messages and writing. The wall surface can be written at will and cleaned after being wiped, so that the teaching, working and living are more convenient, the teaching and working cost is greatly reduced, the product is very environment-friendly, and the purposes of energy conservation and emission reduction are achieved. However, the write-erase performance of the present invention is yet to be further improved.
CN111363462A discloses a water-based writable white board coating and a preparation method thereof. The coating comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 50-80 parts of water-based emulsion, 0.1-2.0 parts of leveling assistant, 0.05-2 parts of defoaming agent, 0.1-5 parts of rheological assistant, 0-3 parts of dispersing agent, 0-30 parts of titanium dioxide and 0-30 parts of water; the component B is 10-30 wt% of a water-based curing agent. The writable white board coating has excellent A/B component mixing performance, can be easily mixed, and avoids the problem of performance reduction caused by uneven mixing of two-component coatings; the activation period is long, and the construction is facilitated; the writing effect is good, and various painting brushes such as a water-based white board pen, a water-based water color pen, a water-based fluorescent pen and the like can be used for writing and painting on the paint film; has super stain resistant effect. However, the oily mark erasing property of the invention still needs to be further improved.
Therefore, in the art, development of a wall paint for writing and painting having excellent writing and erasing properties has been desired.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a wall surface coating for writing and drawing, and a preparation method and application thereof. The wall paint for writing and drawing is a novel functional surface material developed based on a new material technology system, and can better meet the practical requirements of users, such as: no matter how long the white board handwriting stays, the dry cotton cloth can be cleaned by wiping; the watercolor handwriting can be cleaned by wiping the dry cotton cloth no matter how long the watercolor handwriting stays; the oily mark handwriting and the dry cotton cloth can be erased without leaving marks, and the ink can be cleaned after being erased without leaving marks. The wall paint for writing and drawing can completely replace metal white boards and glass white boards, reduces the waste of financial resources and material resources, and is suitable for being used on the wall surfaces of schools, offices or homes.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the invention provides a wall paint for writing and drawing, which comprises A, B two components, wherein the preparation raw materials of the component A comprise the following components in percentage by weight:
85-90% of titanate;
10-15% of isopropanol;
the preparation raw materials of the component B comprise the following components in percentage by weight:
in the invention, the alkyl siloxane/nano-silicon sol system of the main resin comprehensively ensures the excellent basic performance of the wall paint for writing and drawing, the stabilizer ensures the mixing and storing stability of the main resin, the thickening agent can adjust the viscosity of the main resin, the writing and erasing performance of the wall paint for drawing can be improved by the compound use of the alkyl siloxane 1 and the alkyl siloxane 2, the titanate can promote the condensation crosslinking and curing of the alkyl siloxane/nano-silicon sol system, the addition of the polydimethylsiloxane further reduces the surface tension of the resin coating, and the writing and erasing performance of the material is further improved.
In the invention, in the preparation raw material of the component a, the amount of titanate may be 85-90%, for example, 85%, 86%, 87%, 88%, 89% or 90%.
In the present invention, the amount of the isopropyl alcohol used in the raw material for preparing the component a may be 10 to 15%, for example, 10%, 11%, 12%, 13%, 14%, 15%, or the like.
In the invention, in the raw materials for preparing the component B, the dosage of the nano silica sol can be 35-40%, such as 35%, 36%, 37%, 38%, 39% or 40%.
In the present invention, the amount of the stabilizer used in the raw material for preparing the component B may be 1.5 to 2%, for example, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.
In the invention, in the preparation raw material of the component B, the amount of the titanate coupling agent may be 0.1-0.5%, for example, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%.
In the present invention, the thickener may be used in an amount of 0.5 to 1%, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1% in the raw materials for preparing the component B.
In the present invention, the amount of the alkylsiloxane 1 used in the raw material for preparing the component B may be 40 to 45%, for example, 40%, 41%, 42%, 43%, 44%, 45%, or the like.
In the present invention, the amount of the alkylsiloxane 2 used in the preparation raw material of the B component may be 13 to 18%, for example, 13%, 14%, 15%, 16%, 17%, 18%, etc.
In the present invention, the amount of polydimethylsiloxane in the raw material for preparing the component B may be 2 to 6%, for example, 2%, 3%, 4%, 5%, or 6%.
In the present invention, the titanate comprises titanium diisopropyl di (ethylacetoacetate).
In the present invention, the stabilizer includes any one of glacial acetic acid or hydrochloric acid.
Preferably, the titanate coupling agent comprises a chelate of isopropyl tris (dioctyl pyrophosphato acyloxy) ethylene titanate and triethanolamine.
In the present invention, the thickener includes fumed silica.
In the present invention, the alkylsiloxane 1 includes any one of methyltrimethoxysilane or methyltriethoxysilane.
Preferably, the alkylsiloxane 2 comprises any one of dimethylmethoxysilane or dimethylethoxysilane.
In the invention, the viscosity of the polydimethylsiloxane is 15-20 cp, such as 15cp, 17cp, 18cp or 20 cp.
In the invention, the weight ratio of the component A to the component B is 1: 16-1: 19, such as 1:16, 1:17, 1:18 or 1: 19. If the weight ratio of the A component to the B component is too large (e.g., 1:13) or too small (e.g., 1:22), the writing and erasing properties of the wall covering for writing and painting will be deteriorated.
In another aspect, the present invention provides a method for preparing the wall paint for writing and drawing, the method comprising the following steps:
(1) preparation of a component A: uniformly mixing titanate and isopropanol to obtain a component A;
(2) b, preparation of a component: dispersing the nano silica sol, the stabilizer, the titanate coupling agent and the thickening agent at low speed and then at high speed to obtain a mixture 1; uniformly stirring alkyl siloxane 1, alkyl siloxane 2 and polydimethylsiloxane, and standing to obtain a mixture 2; adding the mixture 2 into the mixture 1, uniformly mixing and curing to obtain a component B;
(3) and uniformly mixing the component A and the component B to obtain the wall paint for writing and drawing.
In the present invention, the rotation speed of the low-speed dispersion in step (2) is 450 to 550rpm, such as 450rpm, 470rpm, 500rpm, 530rpm or 550rpm, and the time of the low-speed dispersion is 5 to 10min, such as 5min, 6min, 8min or 10 min.
Preferably, the rotation speed of the high-speed dispersion in the step (2) is 1100-1200 rpm, such as 1100rpm, 1130rpm, 1150rpm, 1180rpm or 1200rpm, and the like, and the time of the high-speed dispersion is 5-10 min, such as 5min, 6min, 8min or 10min, and the like.
Preferably, the rotation speed of the stirring in the step (2) is 120-140 rpm, such as 120rpm, 130rpm or 140rpm, and the like, and the stirring time is 20-30 min, such as 20min, 23min, 25min or 30min, and the like.
Preferably, the standing time in the step (2) is 3-5 h, such as 3h, 3.5h, 4h or 5 h.
Preferably, the mixing temperature in the step (2) is 30-40 ℃, such as 30 ℃, 33 ℃, 35 ℃, 38 ℃ or 40 ℃, the mixing speed is 150-250 rpm, such as 150rpm, 170rpm, 200rpm, 230rpm or 250rpm, and the mixing time is 4-6 h, such as 4h, 4.5h, 5h or 6 h.
Preferably, the curing time in the step (2) is 8-12 h, such as 8h, 9h, 10h, 11h or 12 h.
Preferably, the mixing time in step (3) is 3-5 min, such as 3min, 3.5min, 4min or 5 min.
In still another aspect, the present invention provides the use of the wall paint for writing and drawing as described above in a wall surface.
Compared with the prior art, the invention has at least the following beneficial effects:
the alkyl siloxane/nano-silicone sol system comprehensively ensures the excellent basic performance of the wall paint for writing and painting, the writing and erasing performance of the wall paint for painting can be improved by the compounded use of the alkyl siloxane 1 and the alkyl siloxane 2, and the surface tension of the paint is reduced by the addition of the polydimethylsiloxane, so that the writing and erasing performance of the paint is further improved (the cleanable grade is 1 grade for marks of ink, watercolor pens and oil marker pens); in addition, the wall paint for writing and drawing belongs to a water-based environment-friendly material, has excellent antibacterial durability, high scratch resistance hardness, excellent solvent resistance, good environmental adaptability and convenient and quick construction, and can meet various actual requirements in use.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a wall paint for writing and drawing, which comprises A, B two components, wherein the component A is prepared from the following raw materials in percentage by weight:
titanate 85 percent;
15% of isopropanol;
the preparation raw materials of the component B comprise the following components in percentage by weight:
wherein the titanate is di (ethyl acetoacetate) titanium diisopropyl ester, the nano silicon sol is purchased from Yuda and has the model of ZS30, the titanate coupling agent is a chelate of isopropyl tri (dioctyl pyrophosphato acyloxy) ethylene titanate and triethanolamine, and the viscosity of the polydimethylsiloxane is 15 cp; the weight ratio of the component A to the component B is 1: 16.
The preparation method comprises the following steps:
(1) preparation of a component A: uniformly mixing titanate and isopropanol to obtain a component A;
(2) b, preparation of a component: dispersing the nano silica sol, the glacial acetic acid, the titanate coupling agent and the gas-phase silicon dioxide at the low speed of 450rpm for 10min, and then at the high speed of 1150rpm for 5min to obtain a mixture 1; stirring methyltrimethoxysilane, dimethylethoxysilane and polydimethylsiloxane at the rotating speed of 120rpm for 30min, and standing for 3h to obtain a mixture 2; adding the mixture 2 into the mixture 1, mixing at 30 ℃ and 150rpm for 6h, and curing for 8h to obtain a component B;
(3) and mixing the component A and the component B for 3min to obtain the wall paint for writing and drawing.
Example 2
The embodiment provides a wall paint for writing and drawing, which comprises A, B two components, wherein the component A is prepared from the following raw materials in percentage by weight:
titanate 90 percent;
10% of isopropanol;
the preparation raw materials of the component B comprise the following components in percentage by weight:
wherein the titanate is di (ethyl acetoacetate) titanium diisopropyl ester, the nano silicon sol is purchased from Yuda and has the model of ZS30, the titanate coupling agent is a chelate of isopropyl tri (dioctyl pyrophosphato acyloxy) ethylene titanate and triethanolamine, and the viscosity of the polydimethylsiloxane is 20 cp; the weight ratio of the component A to the component B is 1: 19.
The preparation method comprises the following steps:
(1) preparation of a component A: uniformly mixing titanate and isopropanol to obtain a component A;
(2) b, preparation of a component: dispersing the nano silica sol, the glacial acetic acid, the titanate coupling agent and the gas-phase silicon dioxide at a low speed of 500rpm for 5min, and then at a high speed of 1100rpm for 8min to obtain a mixture 1; stirring methyltrimethoxysilane, dimethylmethoxysilane and polydimethylsiloxane at the rotating speed of 120rpm for 25min, and standing for 4h to obtain a mixture 2; adding the mixture 2 into the mixture 1, mixing at 30 ℃ and 250rpm for 4h, and curing for 12h to obtain a component B;
(3) and mixing the component A and the component B for 5min to obtain the wall paint for writing and drawing.
Example 3
The embodiment provides a wall paint for writing and drawing, which comprises A, B two components, wherein the component A is prepared from the following raw materials in percentage by weight:
86% of titanate;
14% of isopropanol;
the preparation raw materials of the component B comprise the following components in percentage by weight:
wherein the titanate is di (ethyl acetoacetate) titanium diisopropyl ester, the nano silicon sol is purchased from Yuda and has the model of ZS30, the titanate coupling agent is a chelate of isopropyl tri (dioctyl pyrophosphato acyloxy) ethylene titanate and triethanolamine, and the viscosity of the polydimethylsiloxane is 16 cp; the weight ratio of the component A to the component B is 1: 17.
The preparation method comprises the following steps:
(1) preparation of a component A: uniformly mixing titanate and isopropanol to obtain a component A;
(2) b, preparation of a component: dispersing the nano silica sol, hydrochloric acid, titanate coupling agent and gas phase silicon dioxide at a low speed of 550rpm for 7min, and then at a high speed of 1200rpm for 10min to obtain a mixture 1; stirring methyltrimethoxysilane, dimethylethoxysilane and polydimethylsiloxane at the rotating speed of 140rpm for 20min, and standing for 5h to obtain a mixture 2; adding the mixture 2 into the mixture 1, mixing at 40 ℃ and 150rpm for 5h, and curing for 11h to obtain a component B;
(3) and mixing the component A and the component B for 4min to obtain the wall paint for writing and drawing.
Example 4
The embodiment provides a wall paint for writing and drawing, which comprises A, B two components, wherein the component A is prepared from the following raw materials in percentage by weight:
titanate 87 percent;
13% of isopropanol;
the preparation raw materials of the component B comprise the following components in percentage by weight:
wherein the titanate is di (ethyl acetoacetate) titanium diisopropyl ester, the nano silicon sol is purchased from Yuda and has the model of ZS30, the titanate coupling agent is a chelate of isopropyl tri (dioctyl pyrophosphato acyloxy) ethylene titanate and triethanolamine, and the viscosity of the polydimethylsiloxane is 17 cp; the weight ratio of the component A to the component B is 1: 18.
The preparation method comprises the following steps:
(1) preparation of a component A: uniformly mixing titanate and isopropanol to obtain a component A;
(2) b, preparation of a component: dispersing the nano silica sol, hydrochloric acid, titanate coupling agent and gas phase silicon dioxide at the low speed of 470rpm for 8min, and then at the high speed of 1180rpm for 6min to obtain a mixture 1; stirring methyltriethoxysilane, dimethylmethoxysilane and polydimethylsiloxane at the rotating speed of 130rpm for 25min, and standing for 4h to obtain a mixture 2; adding the mixture 2 into the mixture 1, mixing at 40 ℃ and 200rpm for 6h, and curing for 12h to obtain a component B;
(3) and mixing the component A and the component B for 4.5min to obtain the wall paint for writing and drawing.
Example 5
The embodiment provides a wall paint for writing and drawing, which comprises A, B two components, wherein the component A is prepared from the following raw materials in percentage by weight:
88% of titanate;
12% of isopropanol;
the preparation raw materials of the component B comprise the following components in percentage by weight:
wherein the titanate is di (ethyl acetoacetate) titanium diisopropyl ester, the nano silicon sol is purchased from Yuda and has the model of ZS30, the titanate coupling agent is a chelate of isopropyl tri (dioctyl pyrophosphato acyloxy) ethylene titanate and triethanolamine, and the viscosity of the polydimethylsiloxane is 18 cp; the weight ratio of the component A to the component B is 1: 19.
The preparation method comprises the following steps:
(1) preparation of a component A: uniformly mixing titanate and isopropanol to obtain a component A;
(2) b, preparation of a component: dispersing the nano silica sol, the glacial acetic acid, the titanate coupling agent and the gas-phase silicon dioxide at the rotating speed of 520rpm for 6min at a low speed, and then at the rotating speed of 1120rpm for 7min at a high speed to obtain a mixture 1; stirring methyltriethoxysilane, dimethylethoxysilane and polydimethylsiloxane at the rotating speed of 125rpm for 30min, and standing for 3h to obtain a mixture 2; adding the mixture 2 into the mixture 1, mixing at 35 deg.C and 180rpm for 4h, and aging for 11.5h to obtain component B;
(3) and mixing the component A and the component B for 3.5min to obtain the wall paint for writing and drawing.
Comparative example 1
This comparative example differs from example 1 in that the weight ratio of the A component and the B component is 1:13, and the others are the same as in example 1.
Comparative example 2
This comparative example differs from example 1 in that the weight ratio of the A component and the B component is 1:22, and the rest is the same as example 1.
Comparative example 3
This comparative example differs from example 1 only in that alkylsiloxane 2 (dimethyldiethoxysilane) in the starting material for the preparation of component B was replaced by the same amount of alkylsiloxane 1 (methyltrimethoxysilane), and the rest was the same as in example 1.
Comparative example 4
This comparative example differs from example 1 only in that the alkylsiloxane 1 (methyltrimethoxysilane) in the starting material for the preparation of component B was replaced by the same amount of alkylsiloxane 2 (dimethyldiethoxysilane), the rest being identical to example 1.
Comparative example 5
This comparative example differs from example 1 only in that the starting materials for the preparation of component B did not contain polydimethylsiloxane, the weight percent of dimethyldiethoxysilane was 17.4%, and the rest was the same as in example 1.
The wall coatings for writing and painting of examples 1 to 5 and comparative examples 1 to 5 were subjected to a performance test by the following methods:
(1) writing and erasing properties: printing ink, placing for 30 days, and evaluating cleanability grade according to JG/T304-2011 appendix A;
(2) writing and erasing properties: marking with a water color pen, placing for 30 days, and evaluating cleanable grade according to JG/T304-2011 appendix A;
(3) writing and erasing properties: marking by an oily marker pen, placing for 24h, and evaluating the cleanable level according to JG/T304-2011 appendix A;
(4) scratch resistance hardness: recording the pencil hardness value according to JG/T304-2011;
(5) solvent rub resistance: performing according to JG/T304-2011, and recording the exposure times within 100 times;
(6) antibacterial property: according to GB/T21866-2008.
The results of the performance tests are shown in table 1.
TABLE 1
As can be seen from Table 1, the wall coverings for writing and painting prepared in examples 1 to 5 were all of grade 1 in cleanability against the marks of ink, watercolor pens and oil markers, i.e., they were erasable by dry lint-free cotton cloth and were excellent in writing and erasing properties. In addition, the wall coatings for writing and painting prepared in examples 1 to 5 were excellent in durability such as scratch resistance hardness and solvent wiping resistance, and also excellent in antibacterial durability.
Compared with example 1, the wall paint for writing and painting prepared in comparative examples 1 and 2 has poor cleanability grade for the marks of watercolor pens and poor 4 grade for the marks of oil-based markers, and the marks cannot be erased, which shows that the wall paint for writing and painting has poor writing and erasing performance when the weight ratio of the component A to the component B is too large (1:13) or too small (1: 22).
Compared with the wall paint for writing and painting prepared in example 1 and comparative example 3, the cured coating is brittle, and the coating is not cured in the wall paint for writing and painting prepared in comparative example 4, which indicates that the basic performance of the wall paint for writing and painting cannot be ensured when the alkyl siloxane of the component B is only alkyl siloxane 1 or only alkyl siloxane 2.
The wall paint for writing and painting prepared in comparative example 5 was inferior in cleanability level for the marks of the water color pen and inferior in cleanability level to 4 level for the marks of the oil-based marker, and the marks could not be erased, compared to example 1, because polydimethylsiloxane was not added in comparative example 5, resulting in inferior writing and erasing properties.
The applicant states that the present invention is illustrated by the above embodiments and the preparation method of the wall paint for writing and painting, but the present invention is not limited to the above embodiments, i.e. it does not mean that the present invention is implemented only by relying on the above embodiments. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The wall paint for writing and drawing is characterized by comprising A, B two components, wherein the component A is prepared from the following raw materials in percentage by weight:
85-90% of titanate;
10-15% of isopropanol;
the preparation raw materials of the component B comprise the following components in percentage by weight:
2. the wall covering for writing and painting of claim 1, wherein the titanate comprises titanium di (ethyl acetoacetate) diisopropyl ester.
3. The wall paint for writing and drawing according to claim 1 or 2, wherein the stabilizer comprises any one of glacial acetic acid or hydrochloric acid;
preferably, the titanate coupling agent comprises a chelate of isopropyl tris (dioctyl pyrophosphato acyloxy) ethylene titanate and triethanolamine.
4. The wall covering for writing and drawing according to any one of claims 1 to 3, wherein the thickener comprises fumed silica.
5. The wall paint for writing and drawing according to any one of claims 1 to 4, wherein the alkyl siloxane 1 comprises any one of methyl trimethoxy silane or methyl triethoxy silane;
preferably, the alkylsiloxane 2 comprises any one of dimethylmethoxysilane or dimethylethoxysilane.
6. The wall paint for writing and drawing according to any one of claims 1 to 5, wherein the viscosity of the polydimethylsiloxane is 15 to 20 cp.
7. The wall paint for writing and drawing according to any one of claims 1 to 6, wherein the weight ratio of the component A to the component B is 1:16 to 1: 19.
8. The method for preparing the wall paint for writing and drawing according to any one of claims 1 to 7, wherein the preparation method comprises the following steps:
(1) preparation of a component A: uniformly mixing titanate and isopropanol to obtain a component A;
(2) b, preparation of a component: dispersing the nano silica sol, the stabilizer, the titanate coupling agent and the thickening agent at low speed and then at high speed to obtain a mixture 1; uniformly stirring alkyl siloxane 1, alkyl siloxane 2 and polydimethylsiloxane, and standing to obtain a mixture 2; adding the mixture 2 into the mixture 1, uniformly mixing and curing to obtain a component B;
(3) and uniformly mixing the component A and the component B to obtain the wall paint for writing and drawing.
9. The preparation method according to claim 8, wherein the rotation speed of the low-speed dispersion in the step (2) is 450-550 rpm, and the time of the low-speed dispersion is 5-10 min;
preferably, the high-speed dispersion in the step (2) has the rotating speed of 1100-1200 rpm, and the high-speed dispersion time is 5-10 min;
preferably, the stirring speed in the step (2) is 120-140 rpm, and the stirring time is 20-30 min;
preferably, the standing time in the step (2) is 3-5 h;
preferably, the mixing temperature in the step (2) is 30-40 ℃, the mixing rotating speed is 150-250 rpm, and the mixing time is 4-6 h;
preferably, the curing time in the step (2) is 8-12 h;
preferably, the mixing time in the step (3) is 3-5 min.
10. Use of the wall covering for writing and drawing according to any one of claims 1 to 7 in a wall surface.
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