CN110607097B - Preparation of low-odor water-based polymer coating suitable for chalk writing and scrubbing - Google Patents
Preparation of low-odor water-based polymer coating suitable for chalk writing and scrubbing Download PDFInfo
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- CN110607097B CN110607097B CN201810622655.0A CN201810622655A CN110607097B CN 110607097 B CN110607097 B CN 110607097B CN 201810622655 A CN201810622655 A CN 201810622655A CN 110607097 B CN110607097 B CN 110607097B
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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
- C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/08—Copolymers of styrene
- C09D125/14—Copolymers of styrene with unsaturated esters
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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
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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Abstract
The invention relates to a preparation method of a low-odor water-based polymer coating which is suitable for chalk writing and scrubbing. Specifically, the present invention provides an aqueous coating composition, said coating comprising: 30-50 parts of film forming matter, 25-40 parts of pigment and filler, 0.8-1.2 parts of wetting dispersant, 1.0-2.0 parts of film forming additive and water. The volatile organic compound of the coating formed by the coating composition is 0, and the coating has the performance of easy writing and easy erasing to chalk, so that the coating is an excellent green and environment-friendly product with excellent performance.
Description
Technical Field
The invention relates to the field of coatings, in particular to a preparation method of a low-odor water-based polymer coating suitable for chalk writing and scrubbing.
Background
The traditional blackboard paint is a solvent type blackboard paint, is excellent in performance of easy writing and easy erasing, but has the defects of great taste, high VOC content, great harm to human bodies, particularly children, and incapability of meeting the requirements of people on green, environment-friendly and healthy life at present, but the traditional water-based emulsion paint product is difficult to have the performance of easy writing and easy scrubbing, and the easy writing and easy scrubbing of chalk cannot be realized even if the emulsion paint product with the best antifouling property is on the market.
Therefore, there is a need in the art to develop a coating that is green, safe, environmentally friendly and suitable for chalk writing scrubbing.
Disclosure of Invention
The invention aims to provide a green, safe and environment-friendly coating which is suitable for chalk writing and scrubbing.
In a first aspect of the present invention, there is provided an aqueous coating composition, said coating comprising: 30-50 parts of film forming matter, 25-40 parts of pigment and filler, 0.8-1.2 parts of wetting dispersant, 1.0-2.0 parts of film forming additive and water.
In another preferred embodiment, the coating comprises 15-40 parts by weight of water.
In another preferred embodiment, the volume concentration of the pigment and filler is 20-40%.
In another preferred embodiment, the wetting dispersant is polycarboxylic acid anionic surface active.
In another preferred embodiment, the pigment and the filler are a mixture of pigment and filler.
In another preferred embodiment, the pigment comprises titanium dioxide.
In another preferred example, the filler includes: barium sulfate, wollastonite, silica, mica powder, talcum powder, washing kaolin, quartz sand, barite powder, heavy calcium, or a combination thereof.
In another preferred example, the pigment and filler comprises titanium dioxide, barium sulfate, silica and quartz sand.
In another preferred example, the pigment and filler comprises 0.2-5 parts by weight of titanium dioxide, 5-35 parts by weight of barium sulfate, 0.5-20 parts by weight of silica and 0.5-20 parts by weight of quartz sand.
In another preferred embodiment, the pigment and filler comprises 0.5-2 parts by weight of titanium dioxide, 8-30 parts by weight of barium sulfate, 2-10 parts by weight of silica and 2-10 parts by weight of quartz sand.
In another preferred embodiment, the pigment and filler comprises 0.5-2 parts by weight of titanium dioxide, 10-25 parts by weight of barium sulfate, 2-8 parts by weight of silica and 2-8 parts by weight of quartz sand.
In another preferred embodiment, the barium sulfate is ultrafine barium sulfate.
In another preferred embodiment, the titanium dioxide is selected from the following group: rutile titanium dioxide, anatase titanium dioxide, or a combination thereof.
In another preferred example, the titanium dioxide is R-902+ rutile type titanium dioxide.
In another preferred example, the particle size of the quartz sand is 100-400 meshes.
In another preferred example, the particle size of the quartz sand is 150-300 meshes.
In another preferred embodiment, one of the wetting dispersants used is a polycarboxylate.
In another preferred embodiment, the coating further comprises 0.08-0.2 part of pH regulator, 0.3-1.2 part of defoaming agent, 1.2-2.0 parts of thickening agent, 0.1-1 part of sterilization and mildew-proof agent and 0.1-1 part of preservative.
In another preferred embodiment, the amount of the bactericidal and mildewproof agent is 0.1 to 0.6 part by weight, preferably 0.1 to 0.3 part by weight.
In another preferred embodiment, the preservative is used in an amount of 0.1 to 0.6 parts by weight.
In another preferred embodiment, the preservative is used in an amount of 0.2 to 0.5 parts by weight.
In another preferred embodiment, the defoaming agent is selected from the group consisting of: silicone based defoamers, mineral oil based defoamers, or combinations thereof.
In another preferred embodiment, the defoaming agent is a combination of a silicone defoaming agent and a mineral oil defoaming agent.
In another preferred embodiment, the weight ratio of the silicone-based antifoaming agent to the mineral oil-based antifoaming agent is 1-10:1-12, preferably 2-8:2-8, more preferably 3-7:3-8, most preferably 3-6: 4-8.
In another preferred embodiment, the thickener is selected from the group consisting of: a cellulosic thickener, a polyurethane thickener, an alkali swellable thickener, an inorganic bentonite thickener, or a combination thereof.
In another preferred embodiment, the thickener is a mixture of a cellulose thickener and a polyurethane thickener.
In another preferred example, the pH regulator is an organic alcohol amine pH regulator.
In another preferred embodiment, the pH adjusting agent is AMP-95(DOW corporation).
In another preferred embodiment, the wetting and dispersing agent is selected from the group consisting of: polycarboxylate wetting dispersants.
In another preferred embodiment, the polycarboxylate wetting dispersant is a polycarboxylate sodium salt wetting dispersant.
In another preferred embodiment, the wetting and dispersing agent is a polycarboxylic acid anionic surfactant.
In another preferred embodiment, the coating further comprises a high-boiling-point freeze-thaw resisting auxiliary agent.
In another preferred embodiment, the high-boiling-point freeze-thaw resisting assistant is polyethylene glycol.
In another preferred embodiment, the boiling point of the coalescent is 250-320 ℃.
In another preferred embodiment, the film-forming material is a styrene acrylic copolymer emulsion.
In another preferred embodiment, the styrene acrylic copolymer emulsion comprises one or more features selected from the group consisting of:
(i) the particle size of the styrene acrylic copolymer emulsion is 100-200 nm; and/or
(ii) The glass transition temperature Tg of the styrene acrylic copolymer emulsion is 30-40 ℃; and/or
(iii) The minimum film-forming temperature MFFT of the styrene acrylic copolymer emulsion is 15-30 ℃.
In another preferred embodiment, the styrene acrylic copolymer emulsion further comprises one or more features selected from the group consisting of:
(iv) the residual monomer of the styrene acrylic copolymer emulsion is less than or equal to 100 ppm; and/or
(v) TVOCs of the styrene acrylic copolymer emulsion is less than or equal to 100 ppm; and/or
(vi) The content of the solid composition in the styrene acrylic copolymer emulsion is 45-50 wt%.
In another preferred embodiment, the particle size of the styrene acrylic copolymer emulsion is 120-180nm, preferably 140-160 nm.
In another preferred embodiment, the glass transition temperature Tg of the styrene acrylic copolymer emulsion is 34-40 ℃.
In another preferred embodiment, the styrene acrylic copolymer emulsion has a minimum film forming temperature MFFT of 20 to 25 ℃.
In another preferred embodiment, the film-forming assistant is an alcohol ester solvent.
In another preferred embodiment, the alcohol ester solvent is selected from the group consisting of: COASOL, DIB, COASOL 290PLUS, or a combination thereof.
In a second aspect of the present invention, there is provided a process for preparing an aqueous coating composition according to the first aspect of the present invention, said process comprising the steps of:
(1) mixing an optional first thickener, an optional pH regulator, a first wetting and dispersing agent, an optional first defoaming agent and water under stirring to prepare a first mixture;
(2) the pigment filler, optional biocide, film-forming material, optional preservative, second wetting and dispersing agent, optional second thickener, optional second defoamer and optional water are added to the first mixture under stirring to obtain the aqueous coating composition according to the first aspect of the invention.
In another preferred embodiment, the first wetting dispersant and the second wetting dispersant may be the same or different.
In another preferred embodiment, the first thickener and the second thickener may be the same or different.
In another preferred embodiment, the first defoaming agent and the second defoaming agent can be the same or different.
In another preferred embodiment, the first thickener is a cellulose thickener.
In another preferred embodiment, the second thickener is a polyurethane-type thickener.
In another preferred example, in the step (1), the stirring speed of the stirring is 300-500 rpm.
In another preferred example, in the step (2), the stirring speed of the stirring is 600-.
In a third aspect of the present invention, there is provided a coating layer formed by coating with the coating composition according to the first aspect of the present invention.
In a fourth aspect of the invention, there is provided an article comprising a coating according to the third aspect of the invention.
In a fifth aspect of the present invention, there is provided a wall surface coating method, including the steps of:
(a) optionally diluting the aqueous coating composition of the first aspect of the invention to a coating viscosity;
(b) and coating the wall surface with the diluted water-based coating composition.
It is to be understood that within the scope of the present invention, the above-described features of the present invention and those specifically described below (e.g., in the examples) may be combined with each other to form new or preferred embodiments. Not to be reiterated herein, but to the extent of space.
Detailed Description
The present inventors have made extensive and intensive studies and have unexpectedly developed a coating material. Specifically, the coating is added with a film forming substance, a pigment and filler, a wetting dispersant and a film forming additive, and the content of each component is controlled within a reasonable range, so that the blackboard paint which has excellent performance of easy writing and easy erasing to chalk, is environment-friendly and economical, has the voc of 0, and is a rare environment-friendly blackboard paint product with excellent performance in the market. On this basis, the inventors have completed the present invention.
Term(s) for
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
As used herein, the terms "comprising," "including," and "containing" are used interchangeably and include not only closed-form definitions, but also semi-closed and open-form definitions. In other words, the term includes "consisting of … …", "consisting essentially of … …".
As used herein, the terms "parts by weight" and "parts by weight" are used interchangeably and can be any fixed weight expressed in milligrams, grams, or kilograms (e.g., 1mg, 1g, 2g, or 1kg, etc.). For example, a coating consisting of 1 part by weight of component a and 9 parts by weight of component b may be a coating consisting of 1g of component a +9 g of component b, or 10 g of component a +90 g of component b. In the coating material, the percentage content of a certain component is (weight fraction of the component/sum of all the weight parts of the component) × 100%, and therefore, in the coating material composed of 1 part by weight of the component a and 9 parts by weight of the component b, the content of the component a is 10%, and the content of the component b is 90%.
Aqueous coating composition
The invention provides an aqueous coating composition, the coating comprising: 30-50 parts of film forming matter, 25-40 parts of pigment and filler, 0.8-1.2 parts of wetting dispersant, 1.0-2.0 parts of film forming additive and water.
In the aqueous coating composition, water is used as a dispersion medium, and the amount thereof is not particularly limited, and is sufficient that the formulated system is uniformly dispersed and meets the desired viscosity, and preferably 15 to 40 parts by weight.
In the coating composition of the present invention, the pigment and the filler are a combination of a pigment and a filler. In a preferred embodiment, the pigment includes (but is not limited to): titanium dioxide. Typically, the titanium dioxide is rutile type titanium dioxide. In another preferred embodiment, the filler is selected from the group consisting of: barium sulfate, wollastonite, silica, mica powder, talcum powder, washing kaolin, quartz sand, barite powder, heavy calcium, or a combination thereof. Typically, the filler is selected from the group consisting of: barium sulfate, wollastonite, silica, quartz sand and heavy calcium.
In another preferred example, the titanium dioxide is rutile type titanium dioxide.
In another preferred embodiment, the filler is selected from the group consisting of: barium sulfate, wollastonite, silica, mica powder, talcum powder, washing kaolin, quartz sand, barite powder, heavy calcium, or a combination thereof.
In a preferred example, the pigment and filler comprises titanium dioxide, barium sulfate, silica and quartz sand. Preferably, the pigment and filler comprises 0.2-5 parts by weight of titanium dioxide, 5-35 parts by weight of barium sulfate, 0.5-20 parts by weight of silica and 0.5-20 parts by weight of quartz sand. In another preferred example, the particle size of the quartz sand is 100-400 meshes, preferably 150-300 meshes.
The filler is prepared by selecting powder with higher hardness as main powder, such as silicon carbide and quartz sand, and then selecting other powder matching combinations according to formula requirements. In the pigment and filler, rutile type titanium dioxide can increase the covering power of a product coating, quartz sand (preferably 100-400 meshes, and more preferably 150-300 meshes) can increase the hardness of the coating and simultaneously provide certain roughness, so that the coating has the writing easiness, and barium sulfate (such as ultrafine barium sulfate) can increase the hardness, compactness, scrubbing resistance and the like of a paint film.
The paint of the invention can also comprise 0.08 to 0.2 weight part of PH regulator, 0.3 to 1.2 weight parts of defoamer, 1.2 to 2.0 weight parts of thickener, 0.1 to 1 weight part of sterilization and mildew inhibitor and 0.1 to 1 weight part of preservative.
In another preferred embodiment, the anti-foaming agent includes (but is not limited to): silicone based defoamers, mineral oil based defoamers, or combinations thereof. Preferably, the defoaming agent is a combination of a silicone defoaming agent and a mineral oil defoaming agent. More preferably, the weight ratio of the silicone-based antifoaming agent to the mineral oil-based antifoaming agent is 1-10:1-12, preferably 2-8:2-8, more preferably 3-7:3-8, most preferably 3-6: 4-8.
In a preferred embodiment, the thickening agent includes (but is not limited to): a cellulosic thickener, a polyurethane thickener, an alkali swellable thickener, an inorganic bentonite thickener, or a combination thereof. Preferably, the thickener is a mixture of a cellulose-based thickener and a polyurethane-based thickener.
In a preferred embodiment, the PH adjuster in the coating composition may be, but is not limited to, an organic alcohol amine PH adjuster. Typically, the pH adjusting agent is AMP-95 (DOW).
In a preferred embodiment, in the coating composition, the wetting and dispersing agent includes (but is not limited to): polycarboxylate wetting dispersants. Typically, the polycarboxylate wetting dispersant is a polycarboxylate sodium wetting dispersant, and the polycarboxylate sodium wetting dispersant not only has good wetting dispersing ability, but also is beneficial to freeze thawing resistance. In another preferred embodiment, the wetting and dispersing agent is a polycarboxylic acid anionic surfactant.
The coating of the present invention may also include a high boiling point freeze-thaw resistance aid. Preferably, the high-boiling-point freeze-thaw resisting assistant is polyethylene glycol. The high-boiling-point freeze-thaw resisting auxiliary agent can better improve the freeze-thaw condition of the 0VOC product, so that the invention can pass a freeze-thaw test on the basis of 0 VOC.
In the coating composition of the present invention, the film-forming material may be (but is not limited to) a styrene acrylic copolymer emulsion.
Preferably, the styrene acrylic copolymer emulsion comprises one or more features selected from the group consisting of:
(i) the particle size of the styrene acrylic copolymer emulsion is 100-200 nm; and/or
(ii) The glass transition temperature Tg of the styrene acrylic copolymer emulsion is 30-40 ℃; and/or
(iii) The minimum film-forming temperature MFFT of the styrene acrylic copolymer emulsion is 15-30 ℃.
In another preferred embodiment, the styrene acrylic copolymer emulsion further comprises one or more features selected from the group consisting of:
(iv) the residual monomer of the styrene acrylic copolymer emulsion is less than or equal to 100 ppm; and/or
(v) TVOCs of the styrene acrylic copolymer emulsion is less than or equal to 100 ppm; and/or
(vi) The content of the solid composition in the styrene acrylic copolymer emulsion is 45-50 wt%.
In another preferred embodiment, the particle size of the styrene acrylic copolymer emulsion is 120-180nm, preferably 140-160 nm.
In another preferred embodiment, the glass transition temperature Tg of the styrene acrylic copolymer emulsion is 34-40 ℃.
In another preferred embodiment, the styrene acrylic copolymer emulsion has a minimum film forming temperature MFFT of 20 to 25 ℃.
In the coating composition of the present invention, the film-forming aid includes, but is not limited to, alcohol ester solvents. The film-forming assistant reduces the film-forming temperature of the film-forming substance and promotes the film formation.
Preparation method
The present invention also provides a method of preparing the coating composition, the method comprising the steps of:
(1) mixing an optional first thickener, an optional pH regulator, a first wetting and dispersing agent, an optional first defoaming agent and water under stirring to prepare a first mixture;
(2) the pigment filler, optional biocide, film-forming material, optional preservative, second wetting dispersant, optional second thickener, optional second defoamer and optional water are added to the first mixture under agitation to provide the aqueous coating composition of the present invention.
In another preferred embodiment, the first wetting dispersant and the second wetting dispersant may be the same or different.
In another preferred embodiment, the first wetting dispersant and the second wetting dispersant may be the same or different.
In another preferred embodiment, the first thickener and the second thickener may be the same or different.
In another preferred embodiment, the first thickener is a cellulose thickener.
In another preferred embodiment, the second thickener is a polyurethane-type thickener.
In another preferred example, in the step (1), the stirring speed of the stirring is 300-500 rpm.
In another preferred example, in the step (2), the stirring speed of the stirring is 600-.
Coating, article and coating method
The invention also provides a coating, an article and a coating method.
The coating layer is formed by coating the coating composition.
The article of the present invention comprises the coating of the present invention.
The coating method comprises the following steps:
(a) optionally diluting the aqueous coating composition of the present invention to a coating viscosity;
(b) and coating the wall surface with the diluted water-based coating composition.
The main advantages of the invention include:
1. the invention provides a water-based high polymer coating, which solves the problem that common products cannot easily write and erase chalk, finally realizes the unification of the common products and the common products in the same product, meets the requirement on environmental protection, is a 0voc water-based high polymer coating, is used as a blackboard paint for marketing, is an innovation leader in the industry, enriches the existing latex paint system, and creates a new piece of the existing market.
2. The water-based polymer coating provided by the invention has higher mechanical strength, hard paint film and good scrub resistance, and is suitable for repeated writing and erasing of chalk.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out under conventional conditions or conditions recommended by the manufacturers. Unless otherwise indicated, percentages and parts are by weight.
Evaluation of the Properties of the coating
Locating characteristics of blackboard paint
With reference to the provisions of Shanghai's enterprise Standard Q31/0115000140C045-2017, Nippon writable waterborne interior wall paint, which specifies waterborne interior wall products suitable for use on interior wall surfaces of children's houses or other applications that can be repeatedly written using a designated stationery. The specific requirements are shown in Table 1 (product performance requirement) and Table 2 (hazardous substance limit)
TABLE 1
TABLE 2
The positioning of the water-based polymer composition meets the requirements of Q31/0115000140C045-2017 & lt & gt Nippon writable water-based interior wall paint & gt, the content of harmful substances meets the requirements of GB 18582 & lt & gtion 2008 & gt, and VOC (volatile organic compounds) is added in zero; the chalk can also achieve the effect of easy erasing in the aspect of resisting chalk scrawling.
Example 1
Example 1 the components of the coating composition are shown in table 3:
table 3 example 1 components of the coating composition
Preparation method
The preparation method comprises the following steps:
(1) putting water into a dispersion tank, and controlling the rotating speed at 300-500 rpm;
(2) then adding the cellulose thickener, the pH regulator, the wetting dispersant and the defoamer into a dispersion tank in sequence, and stirring for 3 +/-1 minutes;
(3) adding the pigment and filler into a dispersion tank, increasing the rotating speed to 1200 plus 1800 rpm, and dispersing at high speed for 15 +/-3 minutes;
(4) after high-speed dispersion, reducing the rotating speed to 600-800 rpm, adding the bactericide, and stirring for 3 +/-1 min;
(5) slowly adding the film forming substance, and stirring for 5 +/-2 minutes;
(6) then adding a preservative and a wetting dispersant, and stirring for 3 +/-1 minutes;
(7) sequentially adding the polyurethane thickening agent, and stirring for 3 +/-1 minutes;
(8) slowly adding the film forming assistant, and stirring for 3 +/-1 minutes;
(9) adding the defoaming agent, and stirring for 3 +/-1 minutes;
(10) finally, adding water to adjust the viscosity to obtain the coating composition.
And (3) performance test results:
the coating composition prepared in example 1 meets the requirements for product properties in table 1. The anti-graffiti function of the coating composition prepared in example 1, as well as the control of VOCs (volatile organic compounds) and the effect on the coating were also investigated and tested.
In the coating formula in this embodiment 1, the combination of high emulsion content and low PVC (pigment volume concentration) is mainly adopted, and in the aspect of emulsion screening, pure acrylic emulsion with high Tg, low odor, no APEO and no VOC is selected, so that the VOC content of the product is reduced while the paint film reaches a certain hardness; in the aspect of powder screening, powder with high hardness, such as silicon carbide, is selected and matched, meanwhile, a proper amount of powder, such as quartz sand with low mesh number, is added, so that certain roughness is given to a paint film while the hardness of the paint film is ensured, and the coating is combined with chalk in a way of easy writing and easy erasing; according to the requirements of Q31/0115000140C045-2017 Nippon writable water-based interior wall paint, the cleanable grade is less than or equal to 2; the coating in the embodiment 1 is hard and has certain roughness by selecting the emulsion and the filler with excellent performance and selecting the auxiliary agent suitable for the whole system, so that the perfect combination of easy writing and easy erasing of chalk is realized.
Volatile organic matters in the traditional paint are mainly freeze-thaw additives and film-forming additives, the VOC (zero VOC) (OVOC) product has the VOC content requirement of less than or equal to 2g/L on the paint, the VOC brought by the use of the freeze-thaw additives and the film-forming additives needs to be reduced when the product is designed, and meanwhile, the performance of a coating film and the freeze-thaw resistance of the paint in a tank are not influenced.
Example 1 in selecting a coalescent, a high boiling point coalescent (COASOL 290PLUS, boiling point 290 ℃) was selected instead of a low boiling point coalescent to reduce VOC caused by the use of the coalescent; meanwhile, the dosage of a certain amount of hydrophilic wetting agent is increased, and the wetting capacity of the pigment and filler is improved.
The VOC of the coating described in example 1 is 0, and the coating performance of the product and the storage performance in a tank are not influenced, so that the balance of health, environmental protection and performance is achieved to the maximum extent.
Comparative example 1
Comparative example 1 the components of the coating composition are shown in table 4:
table 4 components of the coating composition of comparative example 1
Preparation method
The preparation method comprises the following steps:
(1) putting water into a dispersion tank, and controlling the rotating speed at 300-500 rpm;
(2) then adding the cellulose thickener, the pH regulator, the wetting dispersant and the defoamer into a dispersion tank in sequence, and stirring for 3 +/-1 minutes;
(3) adding the pigment and filler into a dispersion tank, increasing the rotating speed to 1200 plus 1800 rpm, and dispersing at high speed for 15 +/-3 minutes;
(4) after high-speed dispersion, reducing the rotating speed to 600-800 rpm, adding the bactericide, and stirring for 3 +/-1 min;
(5) slowly adding the film forming substance, and stirring for 5 +/-2 minutes;
(6) then adding a preservative and a wetting dispersant, and stirring for 3 +/-1 minutes;
(7) sequentially adding the polyurethane thickening agent, and stirring for 3 +/-1 minutes;
(8) slowly adding a freeze-thaw auxiliary agent, and stirring for 3 +/-1 minutes;
(9) slowly adding the film forming assistant, and stirring for 3 +/-1 minutes;
(10) adding the defoaming agent, and stirring for 3 +/-1 minutes;
(11) finally, adding water to adjust the viscosity to obtain the coating composition.
And (3) performance test results:
the coating prepared from the coating composition of comparative example 1 was flat and smooth, and difficult to write with chalk, and the film hardness was softer than that of example 1, and scratches were formed by repeated writing.
Comparative example 2
Comparative example 2 the components of the coating composition are shown in table 5:
table 5 components of the coating composition of comparative example 2
Preparation method
The preparation method comprises the following steps:
(1) putting water into a dispersion tank, and controlling the rotating speed at 300-500 rpm;
(2) then adding the cellulose thickener, the pH regulator, the wetting dispersant and the defoamer into a dispersion tank in sequence, and stirring for 3 +/-1 minutes;
(3) adding the pigment and filler into a dispersion tank, increasing the rotating speed to 1200 plus 1800 rpm, and dispersing at high speed for 15 +/-3 minutes;
(4) after high-speed dispersion, reducing the rotating speed to 600-800 rpm, adding the bactericide, and stirring for 3 +/-1 min;
(5) slowly adding the film forming substance, and stirring for 5 +/-2 minutes;
(6) then adding a preservative and a wetting dispersant, and stirring for 3 +/-1 minutes;
(7) sequentially adding the polyurethane thickening agent, and stirring for 3 +/-1 minutes;
(8) slowly adding a freeze-thaw auxiliary agent, and stirring for 3 +/-1 minutes;
(9) slowly adding the film forming assistant, and stirring for 3 +/-1 minutes;
(10) adding the defoaming agent, and stirring for 3 +/-1 minutes;
(11) finally, adding water to adjust the viscosity to obtain the coating composition.
And (3) performance test results:
the coating of comparative example 2 is softer than example 1, making it difficult to effectively erase after chalk attachment and the coating is easily damaged by repeated writing.
In conclusion, the combination of easy writing and easy scrubbing of the coating can be ensured only by screening a proper emulsion and a proper pigment and filler matching and controlling the contents of the emulsion and the filler within a reasonable range.
All documents referred to herein are incorporated by reference into this application as if each were individually incorporated by reference. Furthermore, it should be understood that various changes and modifications of the present invention can be made by those skilled in the art after reading the above teachings of the present invention, and these equivalents also fall within the scope of the present invention as defined by the appended claims.
Claims (15)
1. An aqueous coating composition, wherein said coating comprises: 30-50 parts of film forming matter, 25-40 parts of pigment and filler, 0.8-1.2 parts of wetting dispersant, 1.0-2.0 parts of film forming additive and water;
the film forming substance is styrene acrylic copolymer emulsion;
the styrene acrylic copolymer emulsion has the following characteristics:
(i) the particle size of the styrene acrylic copolymer emulsion is 100-200 nm;
(ii) the glass transition temperature Tg of the styrene acrylic copolymer emulsion is 30-40 ℃; and
(iii) the minimum film forming temperature MFFT of the styrene acrylic copolymer emulsion is 15-30 ℃;
the pigment and filler comprises 0.2-5 parts by weight of titanium dioxide, 5-35 parts by weight of barium sulfate, 0.5-20 parts by weight of silicon carbide and 0.5-20 parts by weight of quartz sand.
2. The composition of claim 1, wherein the pigment and filler comprises 0.5-2 parts by weight of titanium dioxide, 8-30 parts by weight of barium sulfate, 2-10 parts by weight of silica and 2-10 parts by weight of quartz sand.
3. The composition of claim 1, wherein the coating further comprises 0.08 to 0.2 parts by weight of a PH adjuster, 0.3 to 1.2 parts by weight of a defoaming agent, 1.2 to 2.0 parts by weight of a thickener, 0.1 to 1 part by weight of a bactericidal and antifungal agent, and 0.1 to 1 part by weight of a preservative.
4. The composition of claim 1, wherein the pigment and filler comprises 0.5-2 parts by weight of titanium dioxide, 10-25 parts by weight of barium sulfate, 2-8 parts by weight of silica and 2-8 parts by weight of quartz sand.
5. The composition of claim 4, wherein the titanium dioxide is selected from the group consisting of: rutile titanium dioxide, anatase titanium dioxide, or a combination thereof.
6. The composition of claim 1, wherein the coalescent is an alcohol ester solvent.
7. The composition of claim 6, wherein the alcohol ester solvent is selected from the group consisting of: DIB, cousol 290PLUS, or a combination thereof.
8. The composition of claim 1 wherein said wetting and dispersing agent is a polycarboxylic acid anionic surface active agent.
9. The composition according to claim 1, wherein the titanium dioxide is R-902+ rutile titanium dioxide.
10. The composition of claim 3, wherein the defoamer is a combination of silicone based defoamers and mineral oil based defoamers.
11. The composition of claim 10, wherein the silicone-based defoamer and the mineral oil-based defoamer are present in a weight ratio of 1-10: 1-12.
12. The composition of claim 5, wherein the styrene acrylic copolymer emulsion further comprises one or more characteristics selected from the group consisting of:
(iv) the residual monomer of the styrene acrylic copolymer emulsion is less than or equal to 100 ppm; and/or
(v) TVOCs of the styrene acrylic copolymer emulsion is less than or equal to 100 ppm; and/or
(vi) The content of the solid composition in the styrene acrylic copolymer emulsion is 45-50 wt%.
13. A coating formed by coating with the coating composition of claim 1.
14. An article comprising the coating of claim 13.
15. A wall surface coating method is characterized by comprising the following steps:
(a) diluting the aqueous coating composition of claim 1 to a coating viscosity;
(b) and coating the wall surface with the diluted water-based coating composition.
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| CN105505029A (en) * | 2015-12-28 | 2016-04-20 | 中航百慕新材料技术工程股份有限公司 | Waterborne environment-friendly blackboard paint with high weather resistance and low VOC |
| CN106905830A (en) * | 2017-03-01 | 2017-06-30 | 广州慧谷工程材料有限公司 | A kind of aqueous electronic whiteboard coating and preparation method and application |
| CN107267012A (en) * | 2017-08-09 | 2017-10-20 | 临海市绿邦水性涂料有限公司 | Aqueous blackboard paint of a kind of washable type of paint film and preparation method thereof |
| CN107400397A (en) * | 2016-05-20 | 2017-11-28 | 立邦涂料（中国）有限公司 | A kind of new stain resistant water-based paint compositions and its preparation method and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105505029A (en) * | 2015-12-28 | 2016-04-20 | 中航百慕新材料技术工程股份有限公司 | Waterborne environment-friendly blackboard paint with high weather resistance and low VOC |
| CN107400397A (en) * | 2016-05-20 | 2017-11-28 | 立邦涂料（中国）有限公司 | A kind of new stain resistant water-based paint compositions and its preparation method and application |
| CN106905830A (en) * | 2017-03-01 | 2017-06-30 | 广州慧谷工程材料有限公司 | A kind of aqueous electronic whiteboard coating and preparation method and application |
| CN107267012A (en) * | 2017-08-09 | 2017-10-20 | 临海市绿邦水性涂料有限公司 | Aqueous blackboard paint of a kind of washable type of paint film and preparation method thereof |
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