CN112300613A - Scrubbing-resistant water-based inorganic coating and preparation method thereof - Google Patents

Abstract

The invention provides a scrub resistant water-based inorganic coating and a preparation method thereof, wherein the scrub resistant water-based inorganic coating comprises, by mass, 300 parts of water and 400 parts of water; 1-5 parts of cellulose ether; 1-5 parts of a stabilizer; 1-5 parts of a dispersant; 1-5 parts of a wetting agent; 1-5 parts of a defoaming agent; 100-200 parts of titanium dioxide; 50-100 parts of talcum powder; 100 portions and 200 portions of inorganic composite filler; 100 portions and 150 portions of styrene-acrylic emulsion; 1-5 parts of a film-forming assistant; 50-150 parts of potassium silicate; 10-15 parts of inorganic coating multifunctional auxiliary agent. The scrub resistant water-based inorganic coating provided by the invention meets the requirements of a standard liquid inorganic coating (liquid inorganic coating for inner and outer walls of a building) released by housing of the people's republic of China and urban and rural construction departments in 2019, and the scrub resistant times can reach 8000.

Description

Scrubbing-resistant water-based inorganic coating and preparation method thereof

Technical Field

The invention relates to the technical field of water-based inorganic coatings, in particular to a scrub-resistant water-based inorganic coating and a preparation method thereof.

Background

Inorganic coatings have not been defined clearly, and are classified into powder type and liquid type according to their forms, and are generally classified into main film-forming substances according to the custom of coating naming, and thus inorganic coatings generally refer to a type of coating in which an inorganic material is used as a main film-forming substance or binder. No. 19/2019, a liquid inorganic coating for inner and outer walls of a building, published by the Ministry of people's republic of China and urban and rural construction, is a revision, and specifically specifies that the liquid inorganic coating is a water-based liquid coating prepared by taking alkali metal silicate, silica sol and the like as main binders, adding a small amount of high molecular organic matters, adding pigments, fillers and auxiliaries, wherein the mass of the high molecular organic matters decomposed at 250-500 ℃ in the liquid inorganic coating for the inner wall accounts for less than or equal to 5% (W/W%) of the mass of the liquid inorganic coating.

The liquid inorganic coating used for the inner and outer walls of the building is definitely specified to have 2 grades of scrubbing resistance by the amendment (the liquid inorganic coating used for the inner and outer walls of the building) released by the housing of the people's republic of China and the Ministry of construction of urban and rural areas: grade 2 2000 times, grade 1 5000 times.

The scrubbing resistance standard of the existing latex paint only reaches 500 times, and the existing latex paint far from meeting the use requirement.

Patent CN111534133A, published japanese 2020.08.14, discloses an inorganic coating of negative oxygen ions and a preparation method thereof; wherein the negative oxygen ion inorganic coating comprises, by mass, 200 parts of water and 210 parts of water; 6-8 parts of cellulose ether; 3-4 parts of a wetting agent; 7-8 parts of a dispersing agent; 5-6 parts of a stabilizer; 10-12 parts of inorganic coating multifunctional auxiliary agent; 2-3 parts of a defoaming agent; 10-20 parts of a mildew inhibitor; 100-150 parts of titanium dioxide; 90-120 parts of calcined kaolin; 190 portions of inorganic composite filler and 200 portions of inorganic composite filler; 50-70 parts of inorganic special emulsion; 150 portions of nano inorganic silicon 125-; 50-75 parts of potassium silicate; 10-30 parts of negative oxygen ion mineral powder. The product of the patent can achieve 5000 times of bottom exposure prevention through a scrubbing resistance test.

Although the inorganic coating of the above patent can reach grade 1 of scrubbing resistance of 5000 times, the inorganic coating can not meet the market demand for scenes requiring higher scrubbing resistance times. Therefore, there is a need in the art for a waterborne inorganic coating with higher scrub resistance to meet the market diversity.

Disclosure of Invention

In order to solve the problem that the prior coating is difficult to meet the requirement of scenes which require the coating to have higher scrubbing resistance times and are mentioned in the background art, the invention provides a scrubbing-resistant water-based inorganic coating which comprises the following components in parts by mass:

further, the water is deionized water.

Further, the wetting agent is a non-ionic wetting agent.

Further, the dispersant is an acrylic homopolymer sodium salt dispersant.

Further, the defoaming agent is a mineral oil defoaming agent.

Further, the inorganic composite filler is a silicate composite filler.

Further, the styrene-acrylic emulsion is composed of styrene and isooctyl acrylate or butyl acrylate.

Further, the stabilizer is a quaternary ammonium salt stabilizer.

The invention also provides a preparation method of the scrub-resistant water-based inorganic coating, which comprises the following steps:

step one, adding cellulose ether, a dispersing agent and a wetting agent into water under a stirring state, and uniformly stirring to obtain a dispersion liquid;

step two, adding inorganic composite filler, titanium dioxide, talcum powder, cellulose ether, styrene-acrylic emulsion, stabilizer and defoamer into the dispersion liquid obtained in the step one under the stirring state, and uniformly stirring to obtain a stable liquid;

step three, adding the inorganic coating multifunctional auxiliary agent, potassium silicate, the defoaming agent and the film forming auxiliary agent into the stable liquid obtained in the step two under the stirring state, and uniformly stirring to obtain a primary product liquid;

and step four, adjusting the viscosity of the primary product liquid in the step three, uniformly stirring, and filtering to obtain a finished product.

Further, in the fourth step, water is adopted to adjust the viscosity of the primary product liquid until the stormo viscosity reaches 95-100 KU.

Compared with the prior art, the scrub resistant water-based inorganic coating provided by the invention has the following advantages:

1. the scrub-resistant water-based inorganic coating is a liquid inorganic coating which meets the standard of the amendment (liquid inorganic coating for inner and outer walls of buildings) issued by housing of the people's republic of China and urban and rural construction departments in 2019.

2. The scrub resistant water-based inorganic coating optimizes the compactness and chalking resistance of the surface of the film according to the basic characteristics of the inorganic coating, and achieves excellent scrub resistant effect.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The reagents used in the examples of the invention and the comparative examples are illustrated below:

cellulose ether: HS100000YP 2;

wetting agent: CROSFECT-202;

dispersing agent: CROSFECT-3500;

a stabilizer: CROSFECT-CS 1;

defoaming agent: mineral oil type antifoaming agents;

titanium dioxide: r699;

inorganic composite filler: silicate composite filler;

multifunctional assistant for inorganic paint: a gatekeeper SS 1;

potassium silicate: CROSFECT-K100;

it should be noted that the examples do not indicate specific techniques or conditions, and the reagents or apparatuses used are not indicated by manufacturers in the literature in the field or the specification of the product, and all of them are conventional products available on the market.

Example 1

Step one, under the stirring state, adding 1 part of cellulose ether, 2 parts of dispersing agent and 2 parts of wetting agent into 300 parts of deionized water, and uniformly stirring to obtain a dispersion liquid, wherein the rotating speed of a stirrer is 500r/min, and the stirring time is 10 min;

step two, adding 100 parts of inorganic composite filler, 100 parts of titanium dioxide, 50 parts of talcum powder, 1 part of cellulose ether, 100 parts of styrene-acrylic emulsion, 2 parts of stabilizer and 1 part of defoamer into the dispersion liquid obtained in the step one under the stirring state, and uniformly stirring to obtain a stable liquid, wherein the rotating speed of a stirrer is 1200r/min, and the stirring time is 40 min;

step three, adding 10 parts of inorganic coating multifunctional auxiliary agent, 50 parts of potassium silicate, 1 part of defoaming agent and 1 part of film forming auxiliary agent into the stable liquid in the step two under the stirring state, uniformly stirring to obtain a primary product liquid, wherein the rotating speed of a stirrer is 800r/min, and the stirring time is 15 min;

and step four, adding 100 parts of deionized water into the primary product liquid obtained in the step three, stirring at the rotating speed of a stirrer of 500r/min for 5min, and filtering to obtain a finished product.

Example 2

Step one, under the stirring state, adding 1 part of cellulose ether, 4 parts of dispersing agent and 4 parts of wetting agent into 200 parts of deionized water, and uniformly stirring to obtain a dispersion liquid, wherein the rotating speed of a stirrer is 500r/min, and the stirring time is 10 min;

step two, adding 200 parts of inorganic composite filler, 200 parts of titanium dioxide, 100 parts of talcum powder, 1 part of cellulose ether, 150 parts of styrene-acrylic emulsion, 4 parts of stabilizer and 1 part of defoaming agent into the dispersion liquid obtained in the step one under the stirring state, and uniformly stirring to obtain a stable liquid, wherein the rotating speed of a stirrer is 1200r/min, and the stirring time is 40 min;

step three, under the stirring state, adding 15 parts of inorganic coating multifunctional auxiliary agent, 150 parts of potassium silicate, 1 part of defoaming agent and 2 parts of film forming auxiliary agent into the stable liquid in the step two, uniformly stirring to obtain a primary product liquid, wherein the rotating speed of a stirrer is 800r/min, and the stirring time is 15 min;

and step four, adding 100 parts of deionized water into the primary product liquid obtained in the step three, stirring at the rotating speed of a stirrer of 500r/min for 5min, and filtering to obtain a finished product.

Comparative example 1

Commercially available latex paints.

Comparative example 2

Commercially available powder coating materials.

Comparative example 3

Commercially available water-based paint

Comparative example 4

Step one, under the stirring state, uniformly mixing 100 parts of deionized water and 10 parts of negative oxygen ion mineral powder I, and continuously stirring until the mixture is uniform to obtain a negative oxygen ion mixed solution, wherein the rotating speed of a stirrer is 500r/min, and the stirring time is 10 min;

step two, adding a coating stabilizer (acid-base regulating reagent) into the negative oxygen ion mixed solution obtained in the step one, regulating the pH value to 7.5, and continuously stirring to obtain a stable negative oxygen ion mixed solution, wherein the rotating speed of a stirrer is 500r/min, and the stirring time is 10 min;

step three, adding 3 parts of cellulose ether, 7 parts of dispersing agent, 3 parts of wetting agent and 5 parts of stabilizing agent into the negative oxygen ion mixed solution in the step two under the stirring state, uniformly stirring to obtain a dispersion solution, wherein the rotating speed of a stirrer is 500r/min, and the stirring time is 10 min;

step four, adding 100 parts of titanium dioxide, 90 parts of calcined kaolin, 190 parts of inorganic composite filler, 3 parts of cellulose ether, 50 parts of inorganic special emulsion and 1 part of defoaming agent into the dispersion liquid in the step three under the stirring state, and uniformly stirring to obtain stable liquid, wherein the rotating speed of a stirrer is 1200r/min, and the stirring time is 40 min;

step five, under the stirring state, adding 125 parts of nano inorganic silicon, 50 parts of potassium silicate, 10 parts of inorganic coating multifunctional auxiliary agent, 1 part of defoaming agent and 10 parts of mildew preventive into the stable liquid in the step four, and uniformly stirring to obtain a primary product liquid, wherein the rotating speed of a stirrer is 800r/min, and the stirring time is 15 min;

and step six, adding 100 parts of deionized water into the primary product liquid obtained in the step five, stirring at the rotating speed of a stirrer of 500r/min for 5min, and filtering to obtain a finished product.

Wherein the negative oxygen ion mineral powder I is prepared from the negative oxygen ion mineral powder comprising 400 parts of tourmaline calomel, 200 parts of rare earth oxide, 50 parts of heavy rare earth oxide, 100 parts of barite powder, 150 parts of silicate, 50 parts of calcium oxide and 50 parts of other auxiliary agents, is white and has the mesh number of 4000 meshes.

For the above-mentioned products of examples 1 to 2 and comparative example, tests were conducted, and the test items included:

detecting the content of the high molecular organic matters: the detection is carried out according to a method in appendix A of liquid inorganic coating for interior and exterior walls of buildings (revised draft);

the water vapor transmission rate is detected as JG/T309-;

and (3) detecting the scrub resistance: GB/T9266-2009;

detection of Volatile Organic Compound (VOC) content: GB/T23986;

and (3) detecting the content of free formaldehyde: GB/T34683;

detecting the contents of benzene, toluene, ethylbenzene and xylene: GB/T23990;

and (3) detecting the content of soluble heavy metal: GB/T23991;

and (3) detecting radioactivity: GB 6566-2010.

The test results are shown in table 1:

TABLE 1

Table 1-indicates that no testing was performed.

As can be seen from the data in Table 1, the scrub resistance times of the paint of the present invention in examples 1 and 2 can reach 8000 times, which is far superior to the commercially available latex paint, powder coating and water-based inorganic coating; comparative example 4 is a negative oxygen ion inorganic paint and a product of the preparation method (publication No. CN111534133A) thereof, the scrub resistance times of which can reach 5000 times and do not show bottom, but is weaker than that of the water-based inorganic paint of the invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The scrub-resistant water-based inorganic coating is characterized by comprising the following components in parts by mass:

2. the scrub resistant aqueous inorganic coating of claim 1, wherein the water is deionized water.

3. The scrub resistant aqueous inorganic coating of claim 1, wherein the wetting agent is a non-ionic wetting agent.

4. The scrub resistant aqueous inorganic coating of claim 1, wherein the dispersant is an acrylic homopolymer sodium salt dispersant.

5. The scrub resistant aqueous inorganic coating of claim 1, wherein the defoamer is a mineral oil defoamer.

6. The scrub resistant aqueous inorganic coating of claim 1, wherein the inorganic composite filler is a silicate composite filler.

7. The scrub resistant aqueous inorganic coating of claim 1, wherein the styrene acrylic emulsion is comprised of styrene and either isooctyl acrylate or butyl acrylate.

8. The scrub resistant aqueous inorganic coating of claim 1, wherein the stabilizer is a quaternary ammonium salt stabilizer.

9. A method for preparing a scrub resistant aqueous inorganic coating as claimed in any of claims 1 to 8, comprising the steps of:

step one, adding cellulose ether, a dispersing agent and a wetting agent into water under a stirring state, and uniformly stirring to obtain a dispersion liquid;

step two, adding inorganic composite filler, titanium dioxide, talcum powder, cellulose ether, styrene-acrylic emulsion, stabilizer and defoamer into the dispersion liquid obtained in the step one under the stirring state, and uniformly stirring to obtain a stable liquid;

step three, adding the inorganic coating multifunctional auxiliary agent, potassium silicate, the defoaming agent and the film forming auxiliary agent into the stable liquid obtained in the step two under the stirring state, and uniformly stirring to obtain a primary product liquid;

and step four, adjusting the viscosity of the primary product liquid in the step three, uniformly stirring, and filtering to obtain a finished product.

10. The method of claim 9, wherein the viscosity of the initial liquid is adjusted to 95-100KU by water in the fourth step.