CN116855140A - Heat-insulating stone-like paint and preparation method thereof - Google Patents

Abstract

The invention discloses a heat-insulating stone-like paint and a preparation method thereof, belonging to the technical field of exterior wall decorative paint, and comprising the following raw materials in parts by weight: 280-300 parts of aqueous polymer emulsion, 130-150 parts of deionized water, 5-10 parts of hydroxyethyl cellulose, 5-10 parts of defoamer, 6-10 parts of glycol, 15-20 parts of dodecanol ester, 1.5-2 parts of hydrophobic modified polycarboxylate sodium salt, 1-1.5 parts of AMP-95, 80-100 parts of modified hollow glass beads, 20-40 parts of composite silica aerogel and 400-500 parts of quartz sand; according to the invention, only a proper amount of quartz sand, modified hollow glass microspheres and composite silica aerogel are used, so that the decoration attractiveness of the real stone paint is ensured; meanwhile, the heat insulation performance of the real stone paint is improved through the synergistic effect of the modified hollow glass beads and the composite silica aerogel.

Description

Heat-insulating stone-like paint and preparation method thereof

Technical Field

The invention belongs to the technical field of coating for exterior wall decoration, and particularly relates to heat-insulating real stone paint and a preparation method thereof.

Background

The real stone paint is a paint with decorative effect similar to marble and granite, and has become a preferred substitute for dry hanging stone and ceramic tile on the outer wall; the heat-insulating real stone paint is a novel building coating material prepared by adding heat-insulating functional components into a formula of the real stone paint, provides a beautiful decorative effect for the outer wall of a building, is used for scenes such as a roof, the outer wall and the like which need to strengthen the heat-insulating effect, can effectively reduce the indoor temperature in summer, and realizes heat preservation and energy conservation of the building.

The Chinese patent with publication number of CN105567021B discloses a water-based cold pigment multifunctional heat-insulating exterior wall real stone paint and a preparation method thereof, wherein the real stone paint is endowed with a multifunctional high-efficiency heat-insulating effect combining three heat-insulating mechanisms of heat insulation, reflective heat insulation and radiation heat insulation by adding cold pigment, glass hollow microspheres, ceramic hollow microspheres, rutile type titanium dioxide, superfine talcum powder and infrared emission ceramic powder. However, the direct and large-scale introduction of the lightweight aggregate and pigment filler into the real stone paint can cause the surface of a paint film to be frosted, and the decorative property of the real stone paint is affected; in addition, a large amount of lightweight aggregate and pigment and filler can cause that the real stone paint needs high rotation speed and long-time stirring to be uniformly dispersed during preparation, and the high rotation speed and long-time stirring can cause the breakage of the glass hollow microspheres and the ceramic hollow microspheres, thereby adversely affecting the heat preservation and heat insulation effects of the real stone paint.

Disclosure of Invention

The invention aims to provide a heat-insulating real stone paint and a preparation method thereof, which are used for solving the problems in the background technology.

The aim of the invention can be achieved by the following technical scheme:

the heat-insulating stone-like paint comprises the following raw materials in parts by weight:

280-300 parts of aqueous polymer emulsion, 130-150 parts of deionized water, 5-10 parts of hydroxyethyl cellulose, 5-10 parts of defoamer, 6-10 parts of glycol, 15-20 parts of dodecanol ester, 1.5-2 parts of hydrophobic modified polycarboxylate sodium salt, 1-1.5 parts of AMP-95, 80-100 parts of modified hollow glass beads, 20-40 parts of composite silica aerogel and 400-500 parts of quartz sand; wherein, hydroxyethyl cellulose is used as a thickener, ethylene glycol is used as an antifreezing agent, dodecanol ester is used as a film forming auxiliary agent, hydrophobic modified polycarboxylic acid sodium salt is used as a dispersing agent, and AMP-95 is used as a multifunctional auxiliary agent.

Further, the aqueous polymer emulsion is any one of acrylic emulsion, silicone-acrylic emulsion and styrene-acrylic emulsion.

Further, the defoaming agent is one of polyoxypropylene polyoxyethylene glyceryl ether and polydimethylsiloxane.

Further, the modified hollow glass beads are prepared by the following steps:

adding 30-40% aqueous acrylic emulsion into a sprayer, spraying aqueous acrylic emulsion on the surfaces of the hollow glass beads under low-speed stirring at the rotating speed of 50-70r/min, and transferring into a baking oven to dry until the weight is constant after spraying to obtain the modified hollow glass beads.

Further, the mass ratio of the aqueous acrylic emulsion to the hollow glass beads is 1:1.

Further, the composite silica aerogel is prepared by the steps of:

step A1, dissolving titanium chloride in an ethanol water solution to obtain a titanium solution; adding ethyl orthosilicate into ethanol water solution, stirring and mixing, and then dropwise adding concentrated hydrochloric acid to adjust the pH value to 2-3 so as to hydrolyze the ethyl orthosilicate to form silica sol; slowly dripping the titanium solution into the silica sol, stirring for 1h to obtain a mixed sol, dripping propylene oxide into the mixed sol, and standing for 12h to obtain wet gel;

and A2, adding ethanol into the wet gel, standing and aging for 24 hours at 50-60 ℃, then transferring into a mixed solution of trimethylchlorosilane and n-hexane for soaking for 24 hours, washing by using n-hexane, then adding into n-hexane for soaking for 24 hours, and finally drying in vacuum for 24 hours at 80 ℃ to obtain the powdery composite silica aerogel.

Further, the volume ratio of the titanium chloride to the ethanol aqueous solution is 1:1, the volume ratio of the ethyl orthosilicate to the ethanol aqueous solution is 1:4, the volume ratio of the titanium solution to the silica sol is 8:5, and the volume fraction of the ethanol aqueous solution is 50%; the dosage of the propylene oxide is 7.5-8% of the volume of the mixed sol.

Further, the volume ratio of the wet gel to the mixed solution of ethanol, trimethylchlorosilane and n-hexane to the n-hexane is 1:2:1-2:2; the volume ratio of the trimethylchlorosilane to the normal hexane in the mixed solution of the trimethylchlorosilane and the normal hexane is 1:4.

Further, the quartz sand is formed by mixing 20-40 mesh quartz sand, 40-80 mesh quartz sand and 80-120 mesh quartz sand according to a ratio of 1:3:1; the quartz sand with different fineness is matched for use, so that the gaps in a paint film of the real stone paint can be reduced, and the thermal barrier property is improved.

A preparation method of heat-insulating stone paint comprises the following steps:

step S1, adding hydroxyethyl cellulose, dodecyl ester, hydrophobic modified polycarboxylic acid sodium salt and AMP-95 into deionized water, and dispersing for 30-50min at 1000-1200r/min to obtain a dispersion liquid A;

s2, adding aqueous polymer emulsion into the dispersion liquid A, dispersing for 15-20min at 1800-2000r/min, then adding quartz sand, and dispersing for 20-30min at 3000-4000r/min to obtain a dispersion liquid B;

and S3, adding a defoaming agent, ethylene glycol, modified hollow glass beads and composite silica aerogel into the dispersion liquid B, and stirring and dispersing for 30-40min at 800-1000r/min to obtain the heat-insulating real stone paint.

The invention has the beneficial effects that:

according to the invention, the hollow glass beads are modified, the surface of the hollow glass beads is sprayed with the aqueous acrylic emulsion, a layer of adhesive layer is formed on the surfaces of the hollow glass beads after film formation and drying, the hollow glass beads in the interior can be effectively protected by the existence of the adhesive layer, and the brittle fracture caused by collision with a stirring paddle is reduced in the preparation and stirring processes of the real stone paint, so that the integrity of the hollow glass beads in the real stone paint is ensured, and the thermal insulation performance and the heat preservation performance of the real stone paint are improved;

according to the invention, a titanium solution is added into silica sol and mixed to obtain mixed sol of titanium and silicon, then wet gel is obtained under the condition that propylene oxide is taken as a catalyst, and then trimethyl chlorosilane is used for carrying out hydrophobic modification on the wet gel to finally obtain titanium dioxide composite silica aerogel, wherein the composite silica aerogel can reflect infrared light in visible light, and the structural characteristics of the aerogel are added, so that the titanium dioxide composite silica aerogel is synergistic with modified hollow glass beads on the basis of reducing heat absorption, and the heat insulation performance of real stone paint can be further improved, thereby achieving better use effect;

in the process of preparing the heat-insulating real stone paint, quartz sand is firstly added for high-speed stirring so that the quartz sand can be uniformly mixed in the real stone paint, and finally, modified hollow glass beads and composite silica aerogel are added into a dispersion liquid B for stirring and dispersing at a low rotating speed of 800-1000r/min, so that the structural damage of the dispersion to the modified hollow glass beads and the composite silica aerogel is reduced to the greatest extent; the hollow glass beads and the composite silica aerogel after modification treatment can be easily dispersed in the dispersion liquid B to form the heat-insulating real stone paint without stirring at high rotation speed and for a long time, so that the heat-insulating property of the real stone paint is ensured;

the invention only uses a proper amount of quartz sand, modified hollow glass microspheres and composite silica aerogel, avoids using a large amount of lightweight aggregate and functional pigment and filler, does not cause the problem of frosting on the surface of a paint film of the real stone paint, and ensures the decoration attractiveness of the real stone paint.

Detailed Description

The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

The modified hollow glass microsphere is prepared by the following steps:

adding 30% solid content aqueous acrylic emulsion into a sprayer, spraying aqueous acrylic emulsion on the surfaces of the hollow glass beads under low-speed stirring at the rotating speed of 50r/min, wherein the mass ratio of the aqueous acrylic emulsion to the hollow glass beads is 1:1, and transferring the coated aqueous acrylic emulsion into an oven to be dried to constant weight, so as to obtain the modified hollow glass beads.

Example 2

The modified hollow glass microsphere is prepared by the following steps:

adding the aqueous acrylic emulsion with the solid content of 40% into a sprayer, spraying the aqueous acrylic emulsion on the surfaces of the hollow glass beads under the condition of low-speed stirring at the rotating speed of 70r/min, wherein the mass ratio of the aqueous acrylic emulsion to the hollow glass beads is 1:1, and transferring the hollow glass beads into an oven for drying until the weight is constant after spraying, thereby obtaining the modified hollow glass beads.

Example 3

The composite silica aerogel is prepared by the following steps:

step A1, dissolving 40mL of titanium chloride in 40mL of ethanol water solution to obtain a titanium solution; adding 10mL of ethyl orthosilicate into 40mL of ethanol water solution, stirring and mixing, then dropwise adding concentrated hydrochloric acid to adjust the pH value to 2, and hydrolyzing the ethyl orthosilicate to form silica sol, wherein the volume fraction of the ethanol water solution is 50%; slowly dropwise adding the titanium solution into the silica sol, stirring for 1h to obtain a mixed sol, dropwise adding 9.8mL of propylene oxide into the mixed sol, and standing for 12h to obtain wet gel;

and A2, adding 50mL of ethanol into 25mL of wet gel, standing and aging for 24 hours at 50 ℃, then transferring into 25mL of mixed solution of trimethylchlorosilane and n-hexane for soaking for 24 hours, washing by using n-hexane, adding into 50mL of n-hexane for soaking for 24 hours, and finally vacuum drying for 24 hours at 80 ℃ to obtain powdery composite silicon dioxide aerogel.

Example 4

The composite silica aerogel is prepared by the following steps:

step A1, dissolving 40mL of titanium chloride in 40mL of ethanol water solution to obtain a titanium solution; adding 10mL of ethyl orthosilicate into 40mL of ethanol water solution, stirring and mixing, and then dropwise adding concentrated hydrochloric acid to adjust the pH value to 3, so that the ethyl orthosilicate is hydrolyzed to form silica sol, and the volume fraction of the ethanol water solution is 50%; slowly dripping the titanium solution into the silica sol, stirring for 1h to obtain a mixed sol, dripping 10.4mL of propylene oxide into the mixed sol, and standing for 12h to obtain wet gel;

and A2, adding 50mL of ethanol into 25mL of wet gel, standing and aging for 24 hours at 60 ℃, then transferring into 25mL of mixed solution of trimethylchlorosilane and n-hexane for soaking for 24 hours, washing by using n-hexane, adding into 50mL of n-hexane for soaking for 24 hours, and finally vacuum drying for 24 hours at 80 ℃ to obtain powdery composite silicon dioxide aerogel.

Example 5

The heat-insulating stone-like paint comprises the following raw materials in parts by weight:

280 parts of acrylic emulsion, 130 parts of deionized water, 5 parts of hydroxyethyl cellulose, 5 parts of polyoxypropylene polyoxyethylene glycerol ether, 6 parts of ethylene glycol, 15 parts of dodecanol ester, 1.5 parts of hydrophobic modified polycarboxylic acid sodium salt, 1 part of AMP-95, 80 parts of modified hollow glass beads prepared in example 1, 20 parts of composite silica aerogel prepared in example 3 and 400 parts of quartz sand; wherein the quartz sand is formed by mixing 20-40 mesh quartz sand, 40-80 mesh quartz sand and 80-120 mesh quartz sand according to a ratio of 1:3:1;

the preparation method of the heat-insulating stone-like paint comprises the following steps:

step S1, adding hydroxyethyl cellulose, dodecyl ester, hydrophobic modified polycarboxylic acid sodium salt and AMP-95 into deionized water, and dispersing for 30min at 1000r/min to obtain a dispersion liquid A;

s2, adding acrylic emulsion into the dispersion liquid A, dispersing for 15min at 1800r/min, then adding quartz sand, and dispersing for 20min at 3000r/min to obtain a dispersion liquid B;

and S3, adding polyoxypropylene polyoxyethylene glyceryl ether, ethylene glycol, the modified hollow glass beads prepared in the example 1 and the composite silica aerogel prepared in the example 3 into the dispersion liquid B, and stirring and dispersing for 30min at 800r/min to obtain the heat-insulating real stone paint.

Example 6

The heat-insulating stone-like paint comprises the following raw materials in parts by weight:

290 parts of silicone-acrylic emulsion, 140 parts of deionized water, 8 parts of hydroxyethyl cellulose, 8 parts of polyoxypropylene polyoxyethylene glycerol ether, 9 parts of ethylene glycol, 17 parts of dodecanol ester, 1.8 parts of hydrophobic modified polycarboxylic acid sodium salt, 1.2 parts of AMP-95, 90 parts of modified hollow glass beads prepared in example 1, 30 parts of composite silicon dioxide aerogel prepared in example 3 and 450 parts of quartz sand; wherein the quartz sand is formed by mixing 20-40 mesh quartz sand, 40-80 mesh quartz sand and 80-120 mesh quartz sand according to a ratio of 1:3:1;

the preparation method of the heat-insulating stone-like paint comprises the following steps:

step S1, adding hydroxyethyl cellulose, dodecyl ester, hydrophobic modified polycarboxylic acid sodium salt and AMP-95 into deionized water, and dispersing for 40min at 1100r/min to obtain a dispersion liquid A;

s2, adding silicone-acrylate emulsion into the dispersion liquid A, dispersing for 18min at 1900r/min, then adding quartz sand, and dispersing for 25min at 3500r/min to obtain a dispersion liquid B;

and S3, adding polyoxypropylene polyoxyethylene glyceryl ether, ethylene glycol, the modified hollow glass beads prepared in the example 1 and the composite silica aerogel prepared in the example 3 into the dispersion liquid B, and stirring and dispersing for 35min at 900r/min to obtain the heat-insulating real stone paint.

Example 7

The heat-insulating stone-like paint comprises the following raw materials in parts by weight:

300 parts of styrene-acrylic emulsion, 150 parts of deionized water, 10 parts of hydroxyethyl cellulose, 10 parts of polydimethylsiloxane, 10 parts of ethylene glycol, 20 parts of dodecanol ester, 2 parts of hydrophobic modified polycarboxylic acid sodium salt, 100 parts of AMP-951.5 parts of modified hollow glass beads prepared in example 2, 40 parts of composite silica aerogel prepared in example 4 and 500 parts of quartz sand; wherein the quartz sand is formed by mixing 20-40 mesh quartz sand, 40-80 mesh quartz sand and 80-120 mesh quartz sand according to a ratio of 1:3:1;

the preparation method of the heat-insulating stone-like paint comprises the following steps:

step S1, adding hydroxyethyl cellulose, dodecyl ester, hydrophobic modified polycarboxylic acid sodium salt and AMP-95 into deionized water, and dispersing for 50min at 1200r/min to obtain a dispersion liquid A;

s2, adding styrene-acrylic emulsion into the dispersion liquid A, dispersing for 20min at 2000r/min, then adding quartz sand, and dispersing for 30min at 4000r/min to obtain a dispersion liquid B;

and S3, adding polydimethylsiloxane, ethylene glycol, the modified hollow glass beads prepared in the example 2 and the composite silica aerogel prepared in the example 4 into the dispersion liquid B, and stirring and dispersing for 40min at 1000r/min to obtain the heat-insulating real stone paint.

Comparative example 1

In this comparative example, the modified hollow glass microspheres produced in example 1 were replaced with hollow glass microspheres that have not been modified, as compared with example 6, and the remaining raw materials and the production method were the same.

Comparative example 2

In this comparative example, as compared with example 6, the composite silica aerogel prepared in example 3 was directly replaced with only silica aerogel, and the remaining raw materials and the preparation method were the same.

Comparative example 3

In this comparative example, the modified hollow glass beads prepared in example 1 and the composite silica aerogel prepared in example 3, which were originally added in step S3, were added together with the silica sand in step S2, compared with example 6, and the other preparation methods were the same.

The real stone paints prepared in examples 5 to 7 and comparative examples 1 to 3 were subjected to performance tests according to JG/T24-20188 synthetic resin emulsion sand wall architectural coating, and the results are shown in Table 1:

TABLE 1

As can be seen from the data in table 1, the stone lacquer prepared in examples 5-7 has excellent comprehensive properties, especially lower thermal conductivity, and the modified hollow glass beads can effectively reduce cracking, and achieve better heat insulation effect together with the cooperation of the composite silica aerogel.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The heat-insulating stone-like paint is characterized by comprising the following raw materials in parts by weight:

280-300 parts of water-based polymer emulsion, 130-150 parts of deionized water, 5-10 parts of hydroxyethyl cellulose, 5-10 parts of defoamer, 6-10 parts of glycol, 15-20 parts of dodecanol ester, 1.5-2 parts of hydrophobic modified polycarboxylate sodium salt, 1-1.5 parts of AMP-95, 80-100 parts of modified hollow glass beads, 20-40 parts of composite silica aerogel and 400-500 parts of quartz sand.

2. The heat-insulating stone-like paint according to claim 1, wherein the aqueous polymer emulsion is any one of acrylic emulsion, silicone-acrylic emulsion and styrene-acrylic emulsion.

3. The heat-insulating stone paint according to claim 1, wherein the defoaming agent is one of polyoxypropylene polyoxyethylene glyceryl ether and polydimethylsiloxane.

4. The heat-insulating stone paint according to claim 1, wherein the modified hollow glass microspheres are prepared by the following steps:

adding 30-40% aqueous acrylic emulsion into a sprayer, spraying aqueous acrylic emulsion on the surfaces of the hollow glass beads while stirring, and transferring into a baking oven to dry until the weight is constant to obtain the modified hollow glass beads.

5. The heat-insulating stone paint according to claim 4, wherein the mass ratio of the aqueous acrylic emulsion to the hollow glass beads is 1:1.

6. The heat-insulating stone-like paint according to claim 1, wherein the composite silica aerogel is prepared by:

step A1, dissolving titanium chloride in an ethanol water solution to obtain a titanium solution; adding ethyl orthosilicate into ethanol water solution, stirring and mixing, and then dropwise adding concentrated hydrochloric acid to adjust the pH value to 2-3 to form silica sol; slowly dripping the titanium solution into the silica sol, stirring for 1h to obtain a mixed sol, dripping propylene oxide into the mixed sol, and standing for 12h to obtain wet gel;

and A2, adding ethanol into the wet gel, standing and aging for 24 hours at 50-60 ℃, then transferring into a mixed solution of trimethylchlorosilane and n-hexane for soaking for 24 hours, washing by using n-hexane, then adding into n-hexane for soaking for 24 hours, and finally drying in vacuum for 24 hours at 80 ℃ to obtain the powdery composite silica aerogel.

7. The heat-insulating stone paint according to claim 6, wherein the volume ratio of titanium chloride to ethanol aqueous solution is 1:1, the volume ratio of ethyl orthosilicate to ethanol aqueous solution is 1:4, the volume ratio of titanium solution to silica sol is 8:5, and the volume fraction of ethanol aqueous solution is 50%; the dosage of the propylene oxide is 7.5-8% of the volume of the mixed sol.

8. The heat-insulating stone paint according to claim 6, wherein the volume ratio of the wet gel to the mixed solution of ethanol, trimethylchlorosilane and n-hexane to n-hexane is 1:2:1-2:2; the volume ratio of the trimethylchlorosilane to the normal hexane in the mixed solution of the trimethylchlorosilane and the normal hexane is 1:4.

9. The heat-insulating stone paint according to claim 1, wherein the quartz sand is formed by mixing 20-40 mesh quartz sand, 40-80 mesh quartz sand and 80-120 mesh quartz sand according to a ratio of 1:3:1.

10. The method for preparing the heat-insulating stone paint according to claim 1, wherein,

step S1, adding hydroxyethyl cellulose, dodecyl ester, hydrophobic modified polycarboxylic acid sodium salt and AMP-95 into deionized water, and dispersing for 30-50min at 1000-1200r/min to obtain a dispersion liquid A;

s2, adding aqueous polymer emulsion into the dispersion liquid A, dispersing for 15-20min at 1800-2000r/min, then adding quartz sand, and dispersing for 20-30min at 3000-4000r/min to obtain a dispersion liquid B;

and S3, adding a defoaming agent, ethylene glycol, modified hollow glass beads and composite silica aerogel into the dispersion liquid B, and stirring and dispersing for 30-40min at 800-1000r/min to obtain the heat-insulating real stone paint.