CN107586497B - Water-based white board coating and preparation method thereof - Google Patents
Water-based white board coating and preparation method thereof Download PDFInfo
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Abstract
The invention provides a water-based white board coating and a preparation method thereof, wherein the white board coating comprises a component A and a component B, and the component A comprises the following components in parts by weight: 60-80 parts of water-based emulsion, 3-6 parts of film forming agent, 0.1-0.5 part of pH regulator, 1.5-3 parts of auxiliary agent, 16-20 parts of water and 12-20 parts of silane coupling agent as component B. The white board coating has the advantages of low cost, long activation period and convenient construction, resists graffiti and powder pollution after film formation, and can accept painting of aqueous water-based watercolor pens and white board pens on a paint film.
Description
Technical Field
The invention belongs to the field of coatings, and relates to a water-based white board coating.
Background
The green concepts of paperless, dustless, environmental protection, health and the like gradually enter people's lives. The white board and the white board pen are produced at the same time, the traditional teaching blackboard and the traditional white board are replaced, dust pollution caused by chalk writing on the blackboard is avoided, and paper is saved. But the whiteboard needs to be customized to a proper size, and enough space is reserved for placing, which brings inconvenience to the life of people. Thus, the compliance of whiteboard paints has just explained these problems. People can brush white board coating on relatively flat base materials (wall surfaces, wood surfaces and the like) according to own hobbies and demands to prepare the base materials with the white board effect by using common base materials.
CN 106349875A discloses a white board powder coating and a preparation method thereof, wherein an epoxy-acrylic acid-alkyd system is used for spraying in the form of powder coating to prepare a white board. The disadvantages are as follows: the temperature for manufacturing the powder coating needs to be higher than 160 ℃, large-scale professional machinery is needed, and DIY cannot be realized. CN 101979449 a discloses an ultraviolet curing coating for white board: acrylic monomers are used as raw materials, and the coating with high hardness and high wear resistance is obtained through photocuring film formation. The disadvantages are as follows: large professional machines are needed, and DIY cannot be achieved. CN 103497602 a discloses an anti-doodling powder coating: the powder anti-graffiti paint is based on polyurethane, wherein the polyurethane comprises acrylic acid and isocyanate, and the type of the powder paint is powder paint. The disadvantages are as follows: large specialized machinery is required. And isocyanate is harmful to human body and environment. CN 102876150A discloses a high weather-resistant anti-sticking anti-doodling water-based paint and a preparation method thereof, wherein the water-based paint is prepared by taking hydroxyl-containing fluorocarbon emulsion and anti-doodling resin as main bodies and isocyanate as a curing agent. The disadvantages are as follows: when the hydroxyl-containing fluorocarbon emulsion and the anti-doodling resin are mixed, a high-speed dispersing agent is required, DIY is not available, and the isocyanate is harmful to human bodies and the environment. CN 104448992A discloses an anti-graffiti water-based paint and a preparation method thereof: the water-based anti-graffiti coating is prepared by using acrylic ester and hydroxyethyl acrylic ester as main bodies and isocyanate as a curing agent. The disadvantages are as follows: isocyanates are harmful to human body and environment. CN 103965724A discloses a weatherable easy-to-clean top-coat composition: pure acrylic emulsion is taken as a film forming matter, and carbon nano tubes and nano silicon dioxide are taken as effective bodies. The disadvantages are as follows: easy to clean, but does not involve graffiti and graffiti removal. CN 103045045 a discloses an aqueous white board wall paint: the water white board wall paint takes epoxy resin and amine curing agent as film forming materials. The disadvantages are as follows: the epoxy resin used is not truly aqueous, is oily, needs to be dispersed by heating and thus causes poor stability of the part.
In summary, the current white board coating mainly has the following three systems: 1) a polyurethane system: currently, most white board paints of polyurethane systems are used. The advantages are that: the density is high. The disadvantages are as follows: the activation period is short, and isocyanate has great harm to human bodies and the environment; 2) epoxy amino system: it is used less frequently. The advantages are that: high compactness and low cost. The disadvantages are as follows: the amine curing agent has pungent taste, and most of the epoxy is emulsified oily small molecular epoxy which is easy to yellow after long-term use; 3) aminosilane coupling agent/epoxy group system: a dual crosslinking system. The advantages are that: the density is high. The disadvantages are as follows: the powder pollution resistance is poor, and the cost is high.
In view of the defects of high price, no environmental protection, large smell, poor whiteboard effect and the like of the current products on the market. The invention develops a water-based white board coating, which has the following advantages: DIY is convenient, has low odor and voc, has excellent graffiti resistance and powder pollution resistance, and can be used for multiple times after being wiped by paper towels or water.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the water-based white board coating and the preparation method thereof, the white board coating has the advantages of low cost, long activation period, convenient construction, doodling resistance and powder pollution resistance after film formation, and can be used for accepting paintings on paint films by water-based water color pens and white board pens.
In order to achieve the purpose, the invention adopts the following technical scheme:
one purpose of the invention is to provide a water-based white board coating, which comprises a component A and a component B, wherein the component A comprises the following components in parts by weight:
the component B is 12-20 parts of silane coupling agent.
The aqueous emulsion may be 60 parts, 62 parts, 65 parts, 68 parts, 70 parts, 72 parts, 75 parts, 78 parts or 80 parts by mass, the film-forming agent may be 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts or 6 parts by mass, the pH adjuster may be 0.1 part, 0.15 part, 0.2 part, 0.25 part, 0.3 part, 0.35 part, 0.4 part, 0.45 part or 0.5 part by mass, the auxiliary agent may be 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts or 3 parts by mass, the water may be 16 parts, 17 parts, 18 parts, 19 parts or 20 parts by mass, the silane coupling agent may be 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts or 20 parts by mass, and the above-mentioned values are not limited to the same values.
As a preferred technical scheme of the invention, the aqueous emulsion comprises acrylamide modified acrylic emulsion and/or methacrylamide modified acrylic emulsion.
The type of the emulsion is of great importance to the performance of the white board coating provided by the invention, in the acrylamide modified acrylic emulsion, amide can react with epoxy and can be mutually dissolved with amino, so that the compactness of a paint film is improved, and the epoxy silane coupling agent and the amino silane coupling agent have better effects, wherein the epoxy effect is better because of the possibility of chemical reaction.
As a preferred embodiment of the present invention, the film forming agent includes any one or a combination of at least two pairs of an alcohol type film forming agent, an alcohol ester type film forming agent, an alcohol ether type film forming agent or an alcohol ether ester type film forming agent, and the combination is exemplified by, typically but not limited to: the film-forming agent comprises a combination of an alcohol film-forming agent and an alcohol ester film-forming agent, a combination of an alcohol ester film-forming agent and an alcohol ether film-forming agent, a combination of an alcohol ether film-forming agent and an alcohol ether ester film-forming agent, a combination of an alcohol ether ester film-forming agent and an alcohol film-forming agent or a combination of an alcohol film-forming agent, an alcohol ester film-forming agent and an alcohol.
Preferably, the alcohol film former comprises any one or combination of at least two of benzyl alcohol, phenethyl alcohol or terephthalyl alcohol, typical but non-limiting examples of which are: a combination of benzyl alcohol and phenethyl alcohol, a combination of phenethyl alcohol and terephthalyl alcohol, a combination of terephthalyl alcohol and benzyl alcohol, a combination of benzyl alcohol, phenethyl alcohol and terephthalyl alcohol, or the like.
Preferably, the alcohol ester film former comprises any one of or a combination of at least two of lauryl, cetyl or stearyl alcohol esters, typical but non-limiting examples of which are: a combination of dodecyl alcohol ester and hexadecyl alcohol ester, a combination of hexadecyl alcohol ester and octadecyl alcohol ester, a combination of octadecyl alcohol ester and dodecyl alcohol ester, or a combination of dodecyl alcohol ester, hexadecyl alcohol ester and octadecyl alcohol ester, etc.
Preferably, the alcohol ether type film former includes ethylene glycol butyl ether and/or propylene glycol phenyl ether.
Preferably, the ether ester type film forming agent includes any one of ethylene glycol butyl ether acetate, butylene glycol butyl ether acetate or hexylene glycol butyl ether acetate or a combination of at least two of the following typical but non-limiting examples: combinations of ethylene glycol butyl ether acetate and butylene glycol butyl ether acetate, combinations of butylene glycol butyl ether acetate and hexylene glycol butyl ether acetate, combinations of hexylene glycol butyl ether acetate and ethylene glycol butyl ether acetate, combinations of ethylene glycol butyl ether acetate, butylene glycol butyl ether acetate and hexylene glycol butyl ether acetate, and the like.
As a preferable technical scheme of the invention, the pH regulator is an amine pH regulator.
Wherein, the amine pH regulator comprises ammonia water and/or DMEA and the like.
As a preferred technical scheme of the invention, the auxiliary agent comprises an antifoaming agent, a rheological agent, a wetting agent and a bactericide.
In a preferred embodiment of the present invention, the defoaming agent includes one or a combination of at least two of an organosilicon defoaming agent, a mineral oil defoaming agent, a hydrophobic particle defoaming agent, and a polymer defoaming agent.
Preferably, the rheological agent comprises any one or at least two of an aqueous polyurethane type rheological agent, an alkali swelling type rheological agent or a cellulose type rheological agent in combination.
Preferably, the wetting agent comprises any one of or a combination of at least two of polyether modified silicone, polyether modified polydimethylsiloxane, ionic acrylic copolymer, alkoxy alcohol ester or organic modified polydimethylsiloxane.
Preferably, the biocide comprises a cason-type biocide.
In a preferred embodiment of the present invention, the amount of the defoaming agent is 0.2 to 0.4 parts by mass, for example, 0.2 part, 0.22 part, 0.25 part, 0.28 part, 0.3 part, 0.32 part, 0.35 part, 0.38 part, or 0.4 part, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
Preferably, the amount of the rheological agent is 0.2 to 1 part by mass, such as 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part, but not limited to the enumerated values, and other unrecited values within the numerical range are also applicable.
Preferably, the wetting agent is present in an amount of 0.2 to 0.5 parts by mass, such as 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, or 0.5 parts, but not limited to the recited amounts, and other unrecited amounts within the range are equally applicable.
Preferably, the amount of the bactericide is 0.2 to 0.5 parts by mass, such as 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, or 0.5 parts, but not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
As a preferred technical scheme of the invention, the structure of the silane coupling agent is shown as the formula I:
wherein R comprises an epoxy silane coupling agent or an amino silane coupling agent, R' comprises methyl or ethyl, and n is an integer greater than or equal to 0.
Where n may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, etc., but is not limited to the recited values, and other values not recited within the numerical range are equally applicable.
Different silane coupling agents have a greater impact on the paint film properties. Wherein the epoxy silane coupling agent has the lowest odor and better graffiti and stain resistance, and the aminosilane coupling agent is used for the next time. The ethoxy silane coupling agent is slower than methoxy group, so the film forming effect is not as good as methoxy group in the same curing time.
The amount of silane coupling agent used affects the properties of the paint film. With increasing amounts, graffiti and stain resistance improved, with little change in odor. This is because the epoxy silane coupling agent itself is weak in taste, but if it is an amine silane coupling agent, the odor property is remarkably improved. The principle of the present patent is that the organic group of the silane coupling agent is well compatible with the emulsion, and the silane coupling agent is hydrolyzed and self-condensed to enhance the external crosslinking effect of the emulsion, so the optimal dosage of the silane coupling agent has an optimal range.
The invention also aims to provide a preparation method of the water-based white board coating, which is characterized by comprising the following steps:
(1) mixing and dispersing water, a defoaming agent, a pH regulator and water-based emulsion, adding a rheological agent, continuously mixing and dispersing, then adding a film-forming assistant, uniformly dispersing, adding a wetting agent, continuously mixing, adding the defoaming agent and water, and mixing to obtain a component A;
(2) and (2) mixing the component A and the component B obtained in the step (1), and standing to obtain the water-based white board coating.
As a preferred embodiment of the present invention, the mixing in step (1) is carried out under stirring.
Preferably, the stirring speed is 800-1200 rpm, such as 800rpm, 850rpm, 900rpm, 950rpm, 1000rpm, 1050rpm, 1100rpm, 1150rpm or 1200rpm, but not limited to the enumerated values, and other non-enumerated values within the range are also applicable.
Preferably, the time for mixing and dispersing the defoaming agent, the pH adjusting agent and the aqueous emulsion in step (1) is 5-15 min, such as 5min, 6min, 7min, 8min, 9min, 10min, 11min, 12min, 13min, 14min or 15min, but not limited to the enumerated values, and other non-enumerated values in the numerical range are also applicable.
Preferably, the time for adding the rheological agent in the step (1) to continue mixing and dispersing is 10-15 min, such as 10min, 10.5min, 11min, 11.5min, 12min, 12.5min, 13min, 13.5min, 14min, 14.5min or 15min, but not limited to the enumerated values, and other non-enumerated values in the numerical range are also applicable.
Preferably, the time for adding the wetting agent in step (1) and continuing the mixing is 3-6 min, such as 3min, 3.5min, 4min, 4.5min, 5min, 5.5min or 6min, but not limited to the recited values, and other non-recited values in the range of the recited values are also applicable.
Preferably, the time for mixing the supplemental antifoaming agent in step (1) is 5-15 min, such as 5min, 6min, 7min, 8min, 9min, 10min, 11min, 12min, 13min, 14min or 15min, but is not limited to the recited values, and other non-recited values in the range of the values are also applicable.
Preferably, the mixing in step (2) is performed by manual stirring, and the mixing time is 10min to 20min, such as 10min, 11min, 12min, 13min, 14min, 15min, 16min, 17min, 18min, 19min or 20min, but not limited to the enumerated values, and other non-enumerated values in the range of the enumerated values are also applicable.
Preferably, the standing time in step (2) is 10-15 min, such as 10min, 10.5min, 11min, 11.5min, 12min, 12.5min, 13min, 13.5min, 14min, 14.5min or 15min, but not limited to the recited values, and other non-recited values in the range of the values are also applicable.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) the invention provides a water-based white board coating, which is doodle-resistant and powder pollution-resistant after a film is formed, and can accept water-based water color pens and paintings of white board pens on a paint film;
(2) the invention provides the water-based white board coating, which has the advantages of low cost, long activation period and convenient construction;
(3) the invention provides a preparation method of a water-based white board coating, which is simple in process and suitable for industrial production.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. 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.
The formulation compositions of the specific examples are shown in table 1, with the units of the components being g.
TABLE 1
Example 8
An aqueous white board coating material, wherein the white board coating material was prepared in the same manner as in example 5 except that the amount of the silane coupling agent used was 12.
Example 9
An aqueous whiteboard coating, which is the same as in example 5 except that the amount of the silane coupling agent used is 16.
Example 10
An aqueous white board coating, wherein the amount of the white board coating except a silane coupling agent is 20. The rest is the same as in example 5.
Example 11
A method of preparing the aqueous whiteboard coating of embodiment 5, the method comprising the steps of:
(1) mixing and dispersing water, a defoaming agent, a pH regulator and the water-based emulsion at 800rpm for 15min, adding a rheological agent, continuing to mix and disperse at 800rpm for 15min, then adding a film-forming aid, dispersing uniformly, adding a wetting agent, continuing to mix for 6min, supplementing the defoaming agent and water, and mixing for 15min to obtain a component A;
(2) and (2) mixing the component A and the component B obtained in the step (1) for 20min, and standing for 15min to obtain the water-based white board coating.
Example 12
A method of preparing the aqueous whiteboard coating of embodiment 5, the method comprising the steps of:
(1) mixing and dispersing water, a defoaming agent, a pH regulator and the water-based emulsion at 1200rpm for 5min, adding a rheological agent, continuing to mix and disperse at 1200rpm for 10min, then adding a film-forming aid, dispersing uniformly, adding a wetting agent, continuing to mix for 3min, supplementing the defoaming agent and water, and mixing for 5min to obtain a component A;
(2) and (2) mixing the component A and the component B obtained in the step (1) for 10min, and standing for 10min to obtain the water-based white board coating.
Example 13
A method of preparing the aqueous whiteboard coating of embodiment 5, the method comprising the steps of:
(1) mixing and dispersing water, a defoaming agent, a pH regulator and the water-based emulsion at 1000rpm for 10min, adding a rheological agent, continuing to mix and disperse at 1000rpm for 12min, then adding a film-forming aid, dispersing uniformly, adding a wetting agent, continuing to mix for 5min, supplementing the defoaming agent and water, and mixing for 10min to obtain a component A;
(2) and (2) mixing the component A and the component B obtained in the step (1) for 15min, and standing for 12min to obtain the water-based white board coating.
Comparative example 1
An aqueous whiteboard coating, which is the same as in example 1 except that the amount of the film-forming aid used is 2.
Comparative example 2
An aqueous whiteboard coating, which is the same as in example 1 except that the amount of the film-forming aid used is 8.
Comparative example 3
An aqueous white board coating material which is the same as in example 2 except that the silane coupling agent is trimethoxyvinylsilane coupling agent.
Comparative example 4
An aqueous whiteboard coating, which is the same as in example 5 except that the amount of the silane coupling agent used is 10.
Comparative example 5
An aqueous whiteboard coating, which is the same as in example 5 except that the amount of the silane coupling agent used is 22.
Comparative example 6
An aqueous whiteboard paint, which is the same as example 5 except that the acrylic emulsion is a pure acrylic emulsion.
Comparative example 7
An aqueous whiteboard paint, which is the same as example 5 except that the acrylic emulsion is a hydroxyl acrylic emulsion.
The preparation method of the formula in each of the above embodiments adopts the above-mentioned preparation process of the aqueous white board coating. Relevant tests were performed for the application of the invention, performance tests including graffiti resistance, stain resistance, odor. The total score of the scoring items is 5 points, the best score is 5 points, and the worst score is 0 point. The specific evaluation criteria are as follows:
scrawling resistance:
and 5, dividing: the white board pen and the water-based water color pen can be easily wiped by dry paper towels without leaving marks
And 4, dividing: the white board pen and the water-based water color pen can be cleaned by dry paper towel without leaving any mark
And 3, dividing: the white board pen and the water-based water color pen can be easily wiped by the wet tissue without leaving any mark
And 2, dividing: the white board pen and the water-based water color pen can be wiped by wet paper towel without leaving any mark
1 minute: the white board pen and the water-based water color pen can be easily wiped by ethanol without leaving traces
0 minute: the white board pen and the water-based water color pen cannot be cleaned
Stain resistance:
and 5, dividing: the carbon black powder can be easily wiped by dry paper towels without leaving any marks
And 4, dividing: the carbon black powder can be wiped by dry paper towel without leaving any mark
And 3, dividing: the carbon black powder can be wiped with dry paper towel with less than 10% of traces
And 2, dividing: the carbon black powder can be wiped by a wet tissue without leaving any trace
1 minute: the carbon black powder can be wiped with wet paper towel with less than 10% of traces
0 minute: carbon black powder cannot be wiped clean
Odor:
and 5, dividing: 400ml jars, 200ml white board paint, substantially no/pleasant to open jars
And 4, dividing: 400ml jars, 200ml white board paint, very light taste when opened
And 3, dividing: 400ml jars, 200ml white board paint, tasted when opened, but acceptable
And 2, dividing: 400ml jars, 200ml white board paint, clear taste when opened
1 minute: 400ml can, 200ml white board coating, can opening with pungent taste
0 minute: 400ml can, 200ml white board coating, can opening with lasting pungent taste
The test results of examples 1 to 10 and comparative examples 1 to 7 are shown in tables 2 and 3:
TABLE 2
TABLE 3
| Performance of | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 | Comparative example 7 |
| Smell(s) | 5 | 2 | 4 | 4 | 4 | 4 | 4 |
| Graffiti-resistant fabric | 1 | 4 | 1 | 2 | 3 | 0 | 0 |
| Resistance to soiling | 1 | 4 | 1 | 2 | 3 | 0 | 0 |
From the above test result data, it can be seen that, with the increase of the amount of the film-forming aid, the odor is obviously deteriorated, and the graffiti resistance and stain resistance are gradually increased, because the film-forming aid has a relatively obvious taste, the film-forming property of the paint film is improved after the film-forming aid is added, the compactness of the paint film is improved, and the graffiti resistance and stain resistance are further improved, but the paint film is relatively softened because the film-forming aid does not form a film.
The applicant states that the present invention is illustrated by the above examples to show the detailed process equipment and process flow of the present invention, but the present invention is not limited to the above detailed process equipment and process flow, i.e. it does not mean that the present invention must rely on the above detailed process equipment and process flow to be implemented. 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 (14)
1. The water-based white board coating is characterized by comprising a component A and a component B, wherein the component A comprises the following components in parts by weight:
the component B is 12-20 parts of a silane coupling agent;
wherein the aqueous emulsion is acrylamide modified acrylic emulsion and/or methacrylamide modified acrylic emulsion; the film forming agent is any one or the combination of at least two of an alcohol film forming agent, an alcohol ester film forming agent, an alcohol ether film forming agent or an alcohol ether ester film forming agent;
the auxiliary agent comprises a defoaming agent, a rheological agent, a wetting agent and a bactericide;
the structure of the silane coupling agent is shown as the formula I:
wherein R comprises an epoxy silane coupling agent or an amino silane coupling agent, R' comprises methyl or ethyl, and n is an integer greater than or equal to 0.
2. The whiteboard coating of claim 1, wherein the alcohol film former comprises any one or a combination of at least two of benzyl alcohol, phenyl ethanol, or terephthalyl alcohol.
3. The whiteboard coating of claim 1, wherein the alcohol ester film former comprises any one of or a combination of at least two of lauryl alcohol ester, cetyl alcohol ester, or stearyl alcohol ester.
4. The whiteboard coating of claim 1, wherein the alcohol ether film former comprises ethylene glycol butyl ether and/or propylene glycol phenyl ether.
5. The whiteboard coating according to claim 1, wherein the ether ester type film forming agent comprises any one of ethylene glycol butyl ether acetate, butanediol butyl ether acetate or hexanediol butyl ether acetate or a combination of at least two of the above.
6. The whiteboard coating according to claim 1, wherein the pH adjuster is an amine pH adjuster.
7. The whiteboard coating of claim 1, wherein the defoamer comprises one or at least 2 combinations of silicones, mineral oil, hydrophobic particles, polymers.
8. The whiteboard coating of claim 1, wherein the rheology agent comprises any one or a combination of at least two of an aqueous polyurethane-type rheology agent, an alkali-swelling rheology agent, or a cellulose-type rheology agent.
9. The whiteboard coating of claim 1, wherein the wetting agent comprises any one or a combination of at least two of polyether modified silicone, ionic acrylic copolymer, alkoxy alcohol ester, or organo modified polydimethylsiloxane.
10. The whiteboard coating of claim 1, wherein the biocide comprises a cason-type biocide.
11. The whiteboard coating according to claim 1, wherein the defoaming agent is 0.2 to 0.4 parts by mass.
12. The whiteboard coating according to claim 1, wherein the rheological agent is 0.2-1 part by mass.
13. The whiteboard paint according to claim 1, wherein the wetting agent is 0.2 to 0.5 parts by mass.
14. The whiteboard paint according to claim 1, wherein the bactericide is 0.2-0.5 parts by mass.
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