阅读说明：本技术 一种环保型隔热中层漆、及其制备方法与施工工艺 (Environment-friendly heat-insulating middle-layer paint, and preparation method and construction process thereof ) 是由 孟奎 孟运 张强国 毛现东 王俞江 于 2020-04-03 设计创作，主要内容包括：本发明公开了一种环保型隔热中层漆,包括上层漆和下层漆；所述上层漆由包括以下重量份的原料配制而成：丙烯酸树脂40-60份、成膜助剂2.0-2.3份、分散剂1-2份、消泡剂0.2-0.3份、增稠剂0.25-0.4份、钛白粉20-40份、去离子水15-25份；所述下层漆由包括以下重量份的原料配制而成：丙烯酸树脂40-60份、成膜助剂2.3-2.6份、分散剂1-3份、消泡剂0.15-0.25份、增稠剂0.25-0.3份、去离子水15-30份、空心玻璃微珠15-30份。添加的钛白粉和空心玻璃微珠能够起到较好的隔热效果；还公开了该中层漆的制备方法,操作简便,混合均匀,还对钛白粉进行改性,提高了分散性,进而能够制成较好隔热效果的中层漆；本发明又公开了该中层漆的施工工艺,采用该工艺使中层漆的隔热效果更优。(The invention discloses an environment-friendly heat-insulating middle layer paint, which comprises an upper layer paint and a lower layer paint; the upper paint is prepared from the following raw materials in parts by weight: 40-60 parts of acrylic resin, 2.0-2.3 parts of film-forming additive, 1-2 parts of dispersant, 0.2-0.3 part of defoaming agent, 0.25-0.4 part of thickening agent, 20-40 parts of titanium dioxide and 15-25 parts of deionized water; the lower layer paint is prepared from the following raw materials in parts by weight: 40-60 parts of acrylic resin, 2.3-2.6 parts of film-forming additive, 1-3 parts of dispersant, 0.15-0.25 part of defoaming agent, 0.25-0.3 part of thickening agent, 15-30 parts of deionized water and 15-30 parts of hollow glass beads. The added titanium dioxide and hollow glass beads can achieve a good heat insulation effect; also discloses a preparation method of the middle layer paint, which is simple and convenient to operate and uniform in mixing, and also modifies titanium dioxide, so that the dispersibility is improved, and the middle layer paint with better heat insulation effect can be prepared; the invention also discloses a construction process of the middle layer paint, and the heat insulation effect of the middle layer paint is better by adopting the process.)

1. The environment-friendly heat-insulating middle layer paint is characterized by comprising an upper layer paint and a lower layer paint;

the upper paint is prepared from the following raw materials in parts by weight: 40-60 parts of acrylic resin, 2.0-2.3 parts of film-forming additive, 1-2 parts of dispersant, 0.2-0.3 part of defoaming agent, 0.25-0.4 part of thickening agent, 20-40 parts of titanium dioxide and 15-25 parts of deionized water;

the lower layer paint is prepared from the following raw materials in parts by weight: 40-60 parts of acrylic resin, 2.3-2.6 parts of film-forming additive, 1-3 parts of dispersant, 0.15-0.25 part of defoaming agent, 0.25-0.3 part of thickening agent, 15-30 parts of deionized water and 15-30 parts of hollow glass beads.

2. The environment-friendly heat insulation middle layer paint as claimed in claim 1, wherein: the acrylic resin is self-crosslinking thermosetting acrylic resin.

3. The environment-friendly heat insulation middle layer paint as claimed in claim 1, wherein: the dispersing agent is one or more of disperbyk118, disperbyk180 and orotan 731A.

4. The environment-friendly heat insulation middle layer paint as claimed in claim 1, wherein: the titanium dioxide is rutile type titanium dioxide.

5. The environment-friendly heat insulation middle layer paint as claimed in claim 1, wherein: the titanium dioxide is modified titanium dioxide modified by a modifier.

6. The environment-friendly heat insulation middle layer paint as claimed in claim 5, wherein the modified titanium dioxide is prepared by the following method:

weighing untreated titanium dioxide, putting into water, stirring and carrying out ultrasonic treatment to obtain a material A for later use;

heating the material A to 70-90 ℃, adjusting the pH value to 10, adding the modifier into the material A, continuously stirring in the adding process, stirring after the adding is finished, filtering, washing and drying to obtain the modified titanium dioxide.

7. The environment-friendly heat insulation middle layer paint as claimed in claim 1, wherein: the modifier is an aluminum coating agent.

8. A method for preparing the environment-friendly heat insulation middle layer paint as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps:

preparation of the topcoat:

weighing the raw materials in parts by weight for later use;

dividing the dispersant into two parts, namely a dispersant A and a dispersant B, wherein the weight of the raw material of the dispersant A is 25-40% of the total weight of the dispersant, and the weight of the dispersant B is 60-75% of the total weight of the dispersant;

dividing the defoaming agent into two parts, namely a defoaming agent A and a defoaming agent B, wherein the weight of the defoaming agent A is 25-40% of the total weight of the defoaming agent, and the weight of the defoaming agent B is 60-75% of the total weight of the defoaming agent;

placing the defoaming agent A, the dispersing agent A and the modified titanium dioxide in water, stirring, dissolving and uniformly mixing to prepare a mixture a;

adding the defoaming agent B and the dispersing agent B into the acrylic resin, and uniformly stirring and mixing to prepare a mixture B;

adding the mixture a, the film-forming aid and the thickening agent into the mixture b, and stirring and discharging bubbles to obtain a topcoat;

preparation of the lower layer paint:

weighing the raw materials in parts by weight for later use;

dividing the dispersant into two parts, namely a dispersant A and a dispersant B, wherein the weight of the raw material of the dispersant A is 25-40% of the total weight of the dispersant, and the weight of the dispersant B is 60-75% of the total weight of the dispersant;

dividing the defoaming agent into two parts, namely a defoaming agent A and a defoaming agent B, wherein the weight of the defoaming agent A is 25-40% of the total weight of the defoaming agent, and the weight of the defoaming agent B is 60-75% of the total weight of the defoaming agent;

placing the defoaming agent A, the dispersing agent A and the hollow glass beads into water, stirring and dissolving, and uniformly mixing to prepare a mixture a;

adding the defoaming agent B and the dispersing agent B into the acrylic resin, and uniformly stirring and mixing to prepare a mixture B;

and adding the mixture a, the film-forming aid and the thickening agent into the mixture b, stirring, draining and infusing to obtain the lower-layer paint.

9. A construction process of the environment-friendly middle layer paint as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps:

step 1: coating the prepared lower layer paint on an object to be coated, wherein the thickness of the coating is 60-80 mu m;

step 2: after 7-9h, the prepared upper layer paint is coated on the lower layer paint, and the thickness of the coating is 70-90 mu m.

Technical Field

The invention relates to preparation of water-based paint, in particular to environment-friendly heat-insulating middle-layer paint, and a preparation method and a construction process thereof.

Background

With the increasing severity of environmental and resource problems, people have to slow down or even abandon the development pace of solvent-based products, and aim at green, environment-friendly, safe, nontoxic and non-combustible water-based products. The water-based product has outstanding environmental advantages due to the use of water as a dispersion medium, and has lower cost and wider application field range.

In densely populated hot areas, buildings and the like experience an increase in average temperature due to the heat-induced urban heat island effect. In the field of petrochemical industry, oil in an oil tank can overflow from the oil tank through solar high-temperature radiation evaporation, so that waste is caused, and certain potential safety hazards exist. The heat insulation layer taking foam plastics and glass wool as main components is introduced to the outer wall of some tank bodies, and although a part of heat is isolated, a part of heat is not easy to release, and the heat insulation effect is not ideal, so that the heat insulation coating is selected. The heat insulation coating has excellent heat insulation performance, has the advantages of low preparation cost, energy conservation, convenient construction and the like, and is widely applied to various fields of building roof walls, petrochemical engineering storage tanks, pipelines and the like.

The Chinese invention with application publication number CN108546466A discloses a heat insulation coating for an outer wall, and particularly discloses a heat insulation coating for an outer wall, which comprises the following components in parts by mass: 30-50 parts of acrylic resin emulsion, 6-10 parts of glass hollow microspheres, 5-9 parts of nano far infrared ceramic powder, 10-16 parts of nano silicon dioxide powder, 5-15 parts of titanium dioxide, 6-9 parts of graphene, 1-3 parts of conductive powder, 0.1-1.5 parts of dispersing agent, 1-1.5 parts of defoaming agent, 0.4-0.8 part of pH regulator, 1-1.5 parts of anti-freezing agent, 0.8-1.5 parts of anti-settling agent, 0.4-1 part of preservative, 12-15 parts of film-forming additive, 0.8-1.8 parts of thickening agent and 60-80 parts of deionized water. The heat-insulating coating for the outer wall provided in the above-mentioned reference document has the advantages that: the heat-insulating property of the coating is effectively improved by adding the glass hollow micro-beads, the far infrared ceramic powder and other measures into the coating. However, in the above invention, some heat insulating materials are simply mixed and coated, and although the coating layer can reflect a part of the wavelength, a large amount of heat exists in the coating layer, and the heat is transferred to the surface of the coated object, so that the heat insulating effect is not ideal.

Disclosure of Invention

Aiming at the defects in the prior art, the first purpose of the invention is to provide an environment-friendly heat-insulating middle layer paint which has a better heat-insulating effect.

In order to achieve the first object, the invention provides the following technical scheme:

an environment-friendly heat-insulating middle layer paint comprises an upper layer paint and a lower layer paint;

the upper paint is prepared from the following raw materials in parts by weight: 40-60 parts of acrylic resin, 2.0-2.3 parts of film-forming additive, 1-2 parts of dispersant, 0.2-0.3 part of defoaming agent, 0.25-0.4 part of thickening agent, 20-40 parts of titanium dioxide and 15-25 parts of deionized water;

the lower layer paint is prepared from the following raw materials in parts by weight: 40-60 parts of acrylic resin, 2.3-2.6 parts of film-forming additive, 1-3 parts of dispersant, 0.15-0.25 part of defoaming agent, 0.25-0.3 part of thickening agent, 15-30 parts of deionized water and 15-30 parts of hollow glass beads.

By adopting the technical scheme, the middle layer paint is divided into the upper layer paint and the lower layer paint, and the upper layer paint plays a role in reflection and reflects light to the environment; titanium dioxide is added into the upper paint layer and is used as a reflection type filling material, the material has a high refractive index, and the transmission path of light in an object is changed by improving the refractive index of the surface of the material, so that incident light is reflected and refracted to the surrounding environment through a mirror surface, and therefore, the heat dissipation capability is good; the lower layer paint plays a role in blocking, the hollow glass beads are added into the lower layer paint and serve as blocking type filling materials, the thermal conductivity is low, and the hollow glass beads are internally provided with loose structures containing air holes as frameworks to form a thermal insulation layer with a certain thickness, so that the heat transmission path is prolonged. Therefore, the heat insulation effect is better; the middle layer paint comprises the upper layer paint and the lower layer paint, when heat enters the middle layer paint, the heat is reflected by the upper layer paint and then blocked by the lower layer paint, so that the heat conducted to the surface of an object to be coated is greatly reduced, and the heat insulation effect is better.

Further, the acrylic resin is a self-crosslinking thermosetting acrylic resin.

By adopting the technical scheme, in the process of manufacturing the intermediate paint, the thermosetting acrylic resin needs to be heated, baked, crosslinked, cured and formed into a film to form a network structure; the self-crosslinking polymer chain contains more than two functional groups with reaction capability, and the self-crosslinking polymer chain is heated to a specified temperature or catalyzed by adding a certain amount of catalyst into thermosetting acrylic resin, so that the functional groups can react with each other to complete crosslinking, and the reaction steps are simple.

Further, the dispersing agent is one or more of disperbyk118, disperbyk180 and orotan 731A.

By adopting the technical scheme, the dispersant is a high molecular weight wetting dispersant, and water is used as a carrier, so that the dispersant can be used for preparing environment-friendly coatings. The dispersing agent has mild dispersibility, so that titanium dioxide, glass beads and the like are uniformly dispersed in the paint of the invention.

Further, the titanium dioxide is rutile type titanium dioxide.

Further, the titanium dioxide is modified titanium dioxide modified by a modifier

By adopting the technical scheme, the titanium dioxide is modified, and the modified titanium dioxide can be better dispersed in the upper paint of the invention.

Further, the modified titanium dioxide is prepared by the following method: weighing untreated titanium dioxide, putting into water, stirring and carrying out ultrasonic treatment to obtain a material A for later use;

heating the material A to 70-90 ℃, adjusting the pH value to 10, adding the modifier into the material A, continuously stirring in the adding process, stirring after the adding is finished, filtering, washing and drying to obtain the modified titanium dioxide.

By adopting the technical scheme, the titanium dioxide is placed in water, stirred uniformly and heated, and then the modifier is added into the titanium dioxide for coating modification, so that the modified titanium dioxide is finally obtained. The modified titanium dioxide can be better dispersed in the topcoat paint after modification treatment, so that the topcoat paint formed by the invention has better heat insulation effect.

Further, the modifier is an aluminum coating agent.

By adopting the technical scheme, the aluminum coating agent is coated on the surface of the titanium dioxide, so that the surface stability and the dispersibility of the titanium dioxide can be improved, particularly the dispersion stability in a deionized water system is improved, and the formed topcoat has a better heat insulation effect.

The second purpose of the invention is to provide a preparation method of the environment-friendly middle layer paint, the environment-friendly heat insulation middle layer paint prepared by the preparation method is divided into upper layer paint and lower layer paint, and titanium dioxide in the upper layer paint is uniformly dispersed in a system, so that the middle layer paint has better heat insulation effect.

In order to achieve the second object, the invention provides the following technical scheme:

a preparation method of environment-friendly heat-insulating middle-layer paint comprises the following steps:

preparation of the topcoat:

weighing the raw materials in parts by weight for later use;

dividing the dispersant into two parts, namely a dispersant A and a dispersant B, wherein the weight of the raw material of the dispersant A is 25-40% of the total weight of the dispersant, and the weight of the dispersant B is 60-75% of the total weight of the dispersant;

dividing the defoaming agent into two parts, namely a defoaming agent A and a defoaming agent B, wherein the weight of the defoaming agent A is 25-40% of the total weight of the defoaming agent, and the weight of the defoaming agent B is 60-75% of the total weight of the defoaming agent;

placing the defoaming agent A, the dispersing agent A and the modified titanium dioxide in water, stirring, dissolving and uniformly mixing to prepare a mixture a;

adding the defoaming agent B and the dispersing agent B into the acrylic resin, and uniformly stirring and mixing to prepare a mixture B;

adding the mixture a, the film-forming aid and the thickening agent into the mixture b, and stirring and discharging bubbles to obtain a topcoat;

preparation of the lower layer paint:

weighing the raw materials in parts by weight for later use;

dividing the dispersant into two parts, namely a dispersant A and a dispersant B, wherein the weight of the raw material of the dispersant A is 25-40% of the total weight of the dispersant, and the weight of the dispersant B is 60-75% of the total weight of the dispersant;

dividing the defoaming agent into two parts, namely a defoaming agent A and a defoaming agent B, wherein the weight of the defoaming agent A is 25-40% of the total weight of the defoaming agent, and the weight of the defoaming agent B is 60-75% of the total weight of the defoaming agent;

placing the defoaming agent A, the dispersing agent A and the hollow glass beads into water, stirring and dissolving, and uniformly mixing to prepare a mixture a;

adding the defoaming agent B and the dispersing agent B into the acrylic resin, and uniformly stirring and mixing to prepare a mixture B;

and adding the mixture a, the film-forming aid and the thickening agent into the mixture b, stirring, draining and infusing to obtain the lower-layer paint.

By adopting the technical scheme, the dispersing agent and the defoaming agent are added in two parts in the preparation method, so that the mixing effect of the auxiliary agent in the mixture a or the mixture b can be ensured, the mixture a and the mixture b have a better mixing effect, and the dispersion is more uniform.

The third purpose of the invention is to provide a construction process of the environment-friendly heat-insulation middle-layer paint, and the middle-layer paint sprayed according to the construction process has a good heat-insulation effect.

In order to achieve the third object, the invention provides the following technical solutions:

a construction process of environment-friendly middle-layer paint comprises the following steps:

step 1: coating the prepared lower layer paint on an object to be coated, wherein the thickness of the coating is 60-80 mu m;

step 2: after 7-9h, the prepared upper layer paint is coated on the lower layer paint, and the thickness of the coating is 70-90 mu m.

By adopting the technical scheme, a double-layer coating mode is adopted, and the double-layer paint disclosed by the invention is combined, so that the paint has a better heat insulation effect.

In conclusion, the invention has the following beneficial effects:

firstly, because the invention adopts double-layer coating of the upper layer paint and the lower layer paint, titanium dioxide and hollow glass beads are respectively added in the upper layer paint and the lower layer paint, the titanium dioxide as a reflection type filling material can improve the external light reflection capability of the upper layer paint, the hollow glass beads as a barrier type filling material can improve the heat barrier effect of the lower layer paint, and the double-layer paint is matched to increase the heat insulation effect of the invention, so that the heat insulation effect is better;

secondly, the surface of the titanium dioxide is modified, the aluminum coating agent increases the dispersibility of the titanium dioxide, and the modified titanium dioxide can be uniformly dispersed in the middle layer paint, so that the heat insulation effect of the paint is better;

and thirdly, the invention also provides a construction process, wherein the lower layer paint is coated on the surface of the coated object, then the upper layer paint is coated on the surface of the lower layer paint, the total coating thickness is the same as the thickness of the upper layer paint and the lower layer paint which are blended and singly coated, and the double-layer coating mode has better heat insulation effect.

Detailed Description

The present invention will be described in further detail with reference to examples.

Preparation example 1

Preparation of modified titanium dioxide

Step 1, weighing 50kg of R960 rutile type titanium dioxide, and adding the weighed R960 rutile type titanium dioxide into distilled water of 20L to obtain a titanium dioxide aqueous solution;

step 2, putting the titanium dioxide aqueous solution into a stirrer, stirring for 0.5h, and then carrying out ultrasonic treatment for 1h to obtain a material A for later use;

step 3, heating the material A to 80 ℃, adjusting the pH value to 10, adding 0.04kg of modifier sodium metaaluminate into the material A, and continuously stirring in the adding process;

and 4, filtering and washing the mixed material obtained in the step 3, and drying at 120 ℃ to prepare the modified titanium dioxide for later use.

Preparation example 2

Preparation of modified titanium dioxide

Step 1, weighing 50kg of R960 rutile type titanium dioxide, and adding the weighed R960 rutile type titanium dioxide into distilled water of 20L to obtain a titanium dioxide aqueous solution;

step 2, putting the titanium dioxide aqueous solution into a stirrer, stirring for 0.5h, and then carrying out ultrasonic treatment for 1h to obtain a material A for later use;

step 3, heating the material A to 70 ℃, adjusting the pH value to 10, adding 0.04kg of modifier sodium metaaluminate into the material A, and continuously stirring in the adding process;

and 4, filtering and washing the mixed material obtained in the step 3, and drying at 120 ℃ to prepare the modified titanium dioxide for later use.

Preparation example 3

Preparation of modified titanium dioxide

Step 1, weighing 50kg of R960 rutile type titanium dioxide, and adding the weighed R960 rutile type titanium dioxide into distilled water of 20L to obtain a titanium dioxide aqueous solution;

step 2, putting the titanium dioxide aqueous solution into a stirrer, stirring for 0.5h, and then carrying out ultrasonic treatment for 1h to obtain a material A for later use;

step 3, heating the material A to 90 ℃, adjusting the pH value to 10, adding 0.04kg of modifier sodium metaaluminate into the material A, and continuously stirring in the adding process;

and 4, filtering and washing the mixed material obtained in the step 3, and drying at 120 ℃ to prepare the modified titanium dioxide for later use.