CN110628327A - Environment-friendly waterproof building coating and preparation method thereof - Google Patents

Abstract

The invention provides an environment-friendly waterproof building coating which comprises the following components in percentage by mass: 20-25% of lime milk solution, 8-15% of 10% gelatin solution, 3-7% of propylene glycol antifreezing agent, 2-5% of alcohol ester dodecafilming aid, 12-17% of silk microfiber, 3-6% of heavy calcium carbonate, 2-5% of quartz powder, 5-9% of talcum powder, 0.1-0.3% of wetting agent AD-405, 0.1-0.3% of strong dispersing agent, 0.1-0.3% of Cognis preservative, 0.1-0.3% of defoaming agent S-220, 0-2% of chitosan, 0.2-0.5% of waterproof agent, 8-15% of polyethylene glycol and 0-3% of pigment, and all the components are mixed and diluted with water to set concentration. The building coating containing the silk microfiber, the gelatin, the polyethylene glycol and the chitosan is prepared by a physical mixing method, the material price is low, the preparation method is simple and easy to operate, toxic and side effects caused by using ethylene glycol ethyl ether are avoided, and the building coating is good in environmental friendliness, high in strength and good in waterproofness.

Description

Environment-friendly waterproof building coating and preparation method thereof

Technical Field

The invention relates to the field of building coatings and paints, in particular to an environment-friendly waterproof building coating and a preparation method thereof.

Background

The prior building exterior wall coating comprises styrene-acrylic coating, pure acrylic coating, epoxy coating, fluorocarbon coating and the like, and mainly has the following problems: easy to generate cracks, poor flexibility and elasticity, etc. Most building walls take cement mortar plastering as a base layer, when the walls are influenced by factors such as temperature change, freeze-thaw cycle and the like, the walls usually crack, and the coating also cracks along with the generation and the propagation of the cracks of the base layer. With the increase of time and the accumulation of the above-mentioned destructive factors, the crack will be further enlarged and deepened, which not only affects the beauty, but also more importantly, causes adverse effects and even damages to the building.

The silk microfiber has no toxic action on human body, is safe and reliable, has good biocompatibility, and is suitable for being developed into functional materials.

Gelatin, without fixed structure and relative molecular weight, is partially degraded by collagen in connective tissues such as animal skin, bone, sarcolemma, fascial, etc. to become white or yellowish, semitransparent, slightly glossy flakes or particles; the gelatin is a colorless, tasteless, transparent and hard amorphous substance without volatility, can be dissolved in hot water and not dissolved in cold water, but can slowly absorb water, swell and soften, and the gelatin can absorb 5-10 times of water by weight. Gelatin is one of very important natural biological high molecular materials, is a partial hydrolysis product of collagen, is cheap and easy to obtain, and has good biocompatibility and degradability.

The polyethylene glycol is non-toxic, non-irritant, slightly bitter in taste, good in water solubility and good in compatibility with a plurality of organic matter components. They have excellent lubricity, moisture retention, dispersibility, adhesives, antistatic agents, softeners and the like, and are widely applied in the industries of cosmetics, pharmacy, chemical fibers, rubber, plastics, papermaking, paint, electroplating, pesticides, metal processing, food processing and the like.

The chitosan is prepared by extracting chitin as a raw material, is insoluble in water, can be dissolved in dilute acid, and can be absorbed by a human body. Chitosan is a primary derivative of chitin. The chemical structure of the polysaccharide is a high molecular basic polysaccharide polymer with cations, and the polysaccharide has unique physical and chemical properties and biological activation function.

Although silk microfibers, gelatin, polyethylene glycol and chitosan have the above advantages, no report is found on the use of mixtures or polymers of silk microfibers, gelatin, polyethylene glycol and chitosan for the preparation of architectural coatings.

Disclosure of Invention

The invention aims to solve the technical problem of providing an environment-friendly waterproof building coating and a preparation method thereof, which have the advantages of good environment-friendly performance, good waterproof performance, high strength, difficult generation of cracks and wide market prospect in the application and popularization of building coatings and paints.

In order to solve the technical problems, the embodiment of the invention provides an environment-friendly waterproof building coating which comprises the following components in percentage by mass: 20-25% of lime milk solution, 8-15% of 10% gelatin solution, 3-7% of propylene glycol antifreezing agent, 2-5% of alcohol ester dodecafilming aid, 12-17% of silk microfiber, 3-6% of heavy calcium carbonate, 2-5% of quartz powder, 5-9% of talcum powder, 0.1-0.3% of wetting agent AD-405, 0.1-0.3% of strong dispersing agent, 0.1-0.3% of Cognis preservative, 0.1-0.3% of defoaming agent S-220, 0-2% of chitosan, 0.2-0.5% of waterproof agent, 8-15% of polyethylene glycol and 0-3% of pigment, and all the components are mixed and diluted with water to set concentration.

Preferably, the composition comprises the following components in percentage by mass: the anti-freezing and anti-freezing agent comprises 25% of lime milk solution, 13% of 10% gelatin solution, 5% of propylene glycol anti-freezing agent, 3% of alcohol ester dodecafilming aid, 17% of silk microfiber, 3% of heavy calcium carbonate, 5% of quartz powder, 5% of talcum powder, 0.3% of wetting agent AD-405, 0.1% of strong dispersing agent, 0.3% of Cognis preservative, 0.1% of defoaming agent S-220, 2% of chitosan, 0.5% of waterproof agent, 15% of polyethylene glycol and 1% of pigment, and the components are mixed and diluted to a set concentration by water.

The preparation method of the silk microfiber comprises the following three stages:

a. preparing degummed silk fibers from cocoons;

b. hydrolyzing the degummed silk fiber into micron-sized silk fiber;

c. washing silk fiber, neutralizing, and freeze-drying to obtain silk microfiber powder.

Further, the step b, hydrolyzing the degummed silk fiber into micron-sized silk fiber, comprises the following specific steps:

adding sodium hydroxide into distilled water, adding dried degumming silk fiber when 30-40% of NaOH is subjected to exothermic reaction and dissolved, stirring by using a scraper, and hydrolyzing, wherein the weight ratio of the sodium hydroxide to the distilled water to the degumming silk fiber is 1: 2.5-3.5: 0.15 to 0.25;

the step c, washing, neutralizing and freeze-drying the silk fiber into silk fiber powder comprises the following specific steps:

c-1, adding water with the volume being 8-10 times that of the distilled water into the reaction mixture in the stage b, and centrifuging for 5-8 minutes at the centrifugal force of 2500-3000 Xg;

c-2, removing the supernatant, resuspending silk fibers in water with the volume 8-10 times that of the distilled water, stirring and centrifuging;

c-3, repeating the step c-2 for 5-8 times, and removing excessive alkali;

c-4, measuring the pH value, and adjusting the pH value to 7.0 by using hydrochloric acid;

and c-5, centrifuging the neutralized silk fiber solution at 3000-4000 rpm for 5-20 min again, suspending in water, repeating for 3-5 times, and finally suspending the fibers in PBS and freeze-drying to obtain the silk microfiber powder.

The invention also provides a preparation method of the environment-friendly waterproof building coating, which comprises the following steps:

(1) at the rotating speed of 650-800 r/min, adding lime milk solution, silk microfiber powder, coarse whiting powder, quartz powder and water into a stirring tank according to the formula ratio, and stirring at a low speed for 20-25 min;

(2) adding 10% gelatin solution, talcum powder, polyethylene glycol and chitosan into the mixed solution obtained in the step (1) according to the formula ratio, and stirring at a high speed of 2000-3000 r/min for 20-30 min;

(3) adding a propylene glycol antifreezing agent, an alcohol ester dodecafilming aid, a wetting agent and a strong dispersing agent into the mixed solution obtained in the step (2) according to the formula ratio, and continuously stirring at a high speed for 30-50 min;

(4) and (4) adding the Cognis preservative, the defoaming agent and the waterproof agent into the mixed solution obtained in the step (3) according to the formula ratio, continuously stirring at a high speed for 30-50 min, slowly adding water during stirring, and stopping stirring until the qualified concentration is reached to obtain the environment-friendly waterproof building coating.

Wherein, the pigment can be added in the step (4) during the stirring process according to the requirement.

The technical scheme of the invention has the following beneficial effects:

the building coating containing the silk microfiber, the gelatin, the polyethylene glycol and the chitosan is prepared by a physical mixing method, the material price is low, the preparation method is simple and easy to operate, toxic and side effects caused by using the ethylene glycol ethyl ether are avoided, the environment friendliness is good, the strength is high, and the building coating has wide market prospects in application and popularization of building coatings and paints.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description is given with reference to specific embodiments.

The invention provides an environment-friendly waterproof building coating which comprises the following components in percentage by mass: 20-25% of lime milk solution, 8-15% of 10% gelatin solution, 3-7% of propylene glycol antifreezing agent, 2-5% of alcohol ester dodecafilming aid, 12-17% of silk microfiber, 3-6% of heavy calcium carbonate, 2-5% of quartz powder, 5-9% of talcum powder, 0.1-0.3% of wetting agent AD-405, 0.1-0.3% of strong dispersing agent, 0.1-0.3% of Cognis preservative, 0.1-0.3% of defoaming agent S-220, 0-2% of chitosan, 0.2-0.5% of waterproof agent, 8-15% of polyethylene glycol and 0-3% of pigment, and all the components are mixed and diluted with water to set concentration.

Preferably, the composition comprises the following components in percentage by mass: the anti-freezing and anti-freezing agent comprises 25% of lime milk solution, 13% of 10% gelatin solution, 5% of propylene glycol anti-freezing agent, 3% of alcohol ester dodecafilming aid, 17% of silk microfiber, 3% of heavy calcium carbonate, 5% of quartz powder, 5% of talcum powder, 0.3% of wetting agent AD-405, 0.1% of strong dispersing agent, 0.3% of Cognis preservative, 0.1% of defoaming agent S-220, 2% of chitosan, 0.5% of waterproof agent, 15% of polyethylene glycol and 1% of pigment, and the components are mixed and diluted to a set concentration by water.

Wherein the 10% gelatin solution is prepared from gelatin and pure water, and the mass percentage of the gelatin to the pure water is 1: 9;

the preparation method of the silk microfiber used for the environment-friendly waterproof building coating comprises the following three stages:

a. preparing degummed silk fibers from cocoons;

b. hydrolyzing the degummed silk fiber into micron-sized silk fiber; the method comprises the following specific steps:

adding sodium hydroxide into distilled water, adding dried degumming silk fiber when 30-40% of NaOH is subjected to exothermic reaction and dissolved, stirring by using a scraper, and hydrolyzing, wherein the weight ratio of the sodium hydroxide to the distilled water to the degumming silk fiber is 1: 2.5-3.5: 0.15 to 0.25.

c. Washing, neutralizing and freeze-drying silk fibers to obtain silk microfiber powder; the method comprises the following specific steps:

c-1, adding water with the volume being 8-10 times that of the distilled water into the reaction mixture in the stage b, and centrifuging for 5-8 minutes at the centrifugal force of 2500-3000 Xg;

c-2, removing the supernatant, resuspending silk fibers in water with the volume 8-10 times that of the distilled water, stirring and centrifuging;

c-3, repeating the step c-2 for 5-8 times, and removing excessive alkali;

c-4, measuring the pH value, and adjusting the pH value to 7.0 by using hydrochloric acid;

and c-5, centrifuging the neutralized silk fiber solution at 3000-4000 rpm for 5-20 min again, suspending in water, repeating for 3-5 times, and finally suspending the fibers in PBS and freeze-drying to obtain the silkworm.

Claims (6)

1. The environment-friendly waterproof building coating is characterized by comprising the following components in percentage by mass: 20-25% of lime milk solution, 8-15% of 10% gelatin solution, 3-7% of propylene glycol antifreezing agent, 2-5% of alcohol ester dodecafilming aid, 12-17% of silk microfiber, 3-6% of heavy calcium carbonate, 2-5% of quartz powder, 5-9% of talcum powder, 0.1-0.3% of wetting agent AD-405, 0.1-0.3% of strong dispersing agent, 0.1-0.3% of Cognis preservative, 0.1-0.3% of defoaming agent S-220, 0-2% of chitosan, 0.2-0.5% of waterproof agent, 8-15% of polyethylene glycol and 0-3% of pigment, and all the components are mixed and diluted with water to set concentration.

2. The environment-friendly waterproof building coating according to claim 1, which comprises the following components in percentage by mass: the anti-freezing and anti-freezing agent comprises 25% of lime milk solution, 13% of 10% gelatin solution, 5% of propylene glycol anti-freezing agent, 3% of alcohol ester dodecafilming aid, 17% of silk microfiber, 3% of heavy calcium carbonate, 5% of quartz powder, 5% of talcum powder, 0.3% of wetting agent AD-405, 0.1% of strong dispersing agent, 0.3% of Cognis preservative, 0.1% of defoaming agent S-220, 2% of chitosan, 0.5% of waterproof agent, 15% of polyethylene glycol and 1% of pigment, and the components are mixed and diluted to a set concentration by water.

3. The environment-friendly waterproof building coating according to claim 1, wherein the preparation method of the silk microfiber comprises the following three stages:

a. preparing degummed silk fibers from cocoons;

b. hydrolyzing the degummed silk fiber into micron-sized silk fiber;

c. washing silk fiber, neutralizing, and freeze-drying to obtain silk microfiber powder.

4. The environmentally friendly waterproof architectural coating according to claim 3,

and the stage b, hydrolyzing the degummed silk fiber into micron-sized silk fiber, which comprises the following specific steps:

adding sodium hydroxide into distilled water, adding dried degumming silk fiber when 30-40% of NaOH is subjected to exothermic reaction and dissolved, stirring by using a scraper, and hydrolyzing, wherein the weight ratio of the sodium hydroxide to the distilled water to the degumming silk fiber is 1: 2.5-3.5: 0.15 to 0.25;

the step c, washing, neutralizing and freeze-drying the silk fiber into silk fiber powder comprises the following specific steps:

c-1, adding water with the volume being 8-10 times that of the distilled water into the reaction mixture in the stage b, and centrifuging for 5-8 minutes at the centrifugal force of 2500-3000 Xg;

c-2, removing the supernatant, resuspending silk fibers in water with the volume 8-10 times that of the distilled water, stirring and centrifuging;

c-3, repeating the step c-2 for 5-8 times, and removing excessive alkali;

c-4, measuring the pH value, and adjusting the pH value to 7.0 by using hydrochloric acid;

and c-5, centrifuging the neutralized silk fiber solution at 3000-4000 rpm for 5-20 min again, suspending in water, repeating for 3-5 times, and finally suspending the fibers in PBS and freeze-drying to obtain the silk microfiber powder.

5. The preparation method of the environment-friendly waterproof building coating as claimed in any one of claims 1 to 4, characterized by comprising the following steps:

(1) at the rotating speed of 650-800 r/min, adding lime milk solution, silk microfiber powder, coarse whiting powder, quartz powder and water into a stirring tank according to the formula ratio, and stirring at a low speed for 20-25 min;

(2) adding 10% gelatin solution, talcum powder, polyethylene glycol and chitosan into the mixed solution obtained in the step (1) according to the formula ratio, and stirring at a high speed of 2000-3000 r/min for 20-30 min;

(3) adding a propylene glycol antifreezing agent, an alcohol ester dodecafilming aid, a wetting agent and a strong dispersing agent into the mixed solution obtained in the step (2) according to the formula ratio, and continuously stirring at a high speed for 30-50 min;

(4) and (4) adding the Cognis preservative, the defoaming agent and the waterproof agent into the mixed solution obtained in the step (3) according to the formula ratio, continuously stirring at a high speed for 30-50 min, slowly adding water during stirring, and stopping stirring until the qualified concentration is reached to obtain the environment-friendly waterproof building coating.

6. The method for preparing environmental protection waterproof building coating according to claim 5, wherein the pigment is added during the stirring in the step (4).