CN112391089A - Thermal super-structured micro-nano energy-saving heat-insulating coating and preparation method thereof - Google Patents

Abstract

The invention discloses a thermal super-structure micro-nano energy-saving heat-insulating coating and a preparation method thereof. According to the invention, through the structural process design of material optimization and heat transfer process, the low component addition and high-efficiency heat insulation of the low-heat-resistance material are realized, and further, the effective control of the heat of the outer surface is realized through the thinner coating layer thickness.

Description

Thermal super-structured micro-nano energy-saving heat-insulating coating and preparation method thereof

Technical Field

The invention relates to the field of functional building materials, in particular to a thermal super-structure micro-nano energy-saving heat-insulating coating and a preparation method thereof.

Background

With the development demand of the conservation-oriented society, the gradual promotion of energy-saving and environment-friendly policies in China makes energy conservation and emission reduction imperative, and various new energy conservation and emission reduction technologies and new materials are also widely applied to the building industry. The requirements of the existing energy-saving building are to use building energy-saving materials which have low heat conductivity coefficient and good thermal insulation performance and can reach a certain fire-proof grade. The traditional external wall insulation technology is to use insulation boards with low heat conductivity coefficient, such as polyurethane foam boards, extruded sheets, rock wool boards and the like, when the low heat conductivity coefficient is determined, the insulation materials have an obvious common characteristic, namely the thickness problem, and the thickness of the external wall insulation materials is increased by inertia to achieve the effect in order to achieve the insulation requirement. The direct problems brought by the building industry are common factors that the external wall heat-insulating material is too thick, the universality is reduced by dry hanging of the external vertical surface, the using layer is high, the external vertical surface is easy to fall off and crack, the safety performance of the dry hanging layer of the external vertical surface is reduced, the fire-fighting grade is reduced and the like. Particularly, when the heat-insulating and energy-saving material is popularized to special places such as grain depots, oil depots, logistics depots, cold chain depots and the like, the common problems are remarkable. Therefore, from the common requirement of energy conservation of exterior wall buildings, new materials and new design of energy-saving wall body energy-saving structures need to be explored, and new coatings suitable for various building energy-saving application places need to be developed in a matching manner.

Thermal metamaterials are a special class of materials whose novel physical properties are determined by the geometry of the material rather than the physical properties of the material itself, which is called a metamaterials to highlight the critical role of the geometry in it. In the 1990's, the metamaterial has been widely studied in the fields of electromagnetism and thermal control. The existing energy-saving heat-insulating coating is realized by adding materials with low heat conductivity coefficient and high reflectivity and other physical means into the coating, the structural function design, the current effect of additives, the small-size effect and the heat circulation of the outer facade of a building are combined to carry out the functional design of the materials, the low heat conductivity, the high reflectivity and the heat flow control of the coating are realized, and the common problems of the existing energy-saving heat-insulating coating, such as over-thick outer wall heat-insulating material, reduced universality of outer facade dry hanging, high using layer, easy falling, easy cracking, reduced safety performance of the outer facade dry hanging layer, reduced fire-fighting grade and the like are solved. And also lays a material guarantee for the heat-insulating and energy-saving material when being popularized to grain depots, oil depots, logistics depots, cold chain depots and other special places.

Disclosure of Invention

The heat-insulating material aims to solve the problem that the existing heat-insulating material has an obvious common characteristic thickness and common factors such as easy falling and cracking of an outer vertical surface, reduction of safety performance of a dry hanging layer of the outer vertical surface, reduction of fire-fighting grade and the like. In particular to an outer vertical surface heat-insulating layer of a heat-insulating energy-saving material which faces to special places such as grain depots, oil depots, logistics depots, cold chain depots and the like. Therefore, from the common requirement of energy conservation of exterior wall buildings, new materials and the design of a new energy-saving wall body energy-saving structure are explored, and new coating suitable for various building energy-saving application places is developed in a matched manner.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a thermal super-structure micro-nano energy-saving heat-insulating coating which comprises a thermal super-structure micro-nano material, wherein the thermal super-structure micro-nano material comprises flaky superfine titanium dioxide, flaky aerogel powder and cellulose with long aspect ratio and particle size.

Furthermore, the length-thickness ratio of the flaky superfine titanium dioxide particles is more than 20, and the particle size is not more than 200 microns.

Further, the length-thickness ratio of the flaky aerogel powder is more than 20, and the particle size is not more than 150 microns.

Further, the long aspect ratio particle size cellulose has an aspect ratio greater than 10. The cellulose is hydroxypropyl methylcellulose, hydroxyethyl cellulose or methylcellulose.

The heat control network is constructed by using the material with the long aspect ratio, so that the effect of better heat transfer or heat transfer inhibition by low heat conductivity can be realized, the formula screening of the coating is guided by the design of the heat transfer heat super-structure theory, the material is screened from the shape angle of the material, and the better heat control effect can be realized by controlling the shape of the raw material with less addition amount.

According to the invention, the addition of the traditional low-heat-resistance substance is reduced by adding the flaky aerogel powder and the particles, so that the heat conductivity coefficient of the coating is further reduced. Flaky aerogel powder and granule can effectually form the network structure that hinders heat transfer in coating system, and the reason of choosing flaky aerogel is in order to strengthen the efficiency of heat superstructure (hindering heat transfer). The control of the addition amount is reduced by optimizing the shape of the functional material to the maximum.

Further, the energy-saving heat-insulating coating comprises the following raw materials in parts by mass:

28-38 parts of acrylic emulsion, 6-10 parts of flaky ultrafine titanium dioxide, 4-7 parts of floating beads, 10-20 parts of hollow glass microspheres, 10-20 parts of flaky aerogel powder, 5-10 parts of film-forming assistant, 10-15 parts of ethylene glycol, 1-2 parts of pH regulator, 1-2 parts of wetting dispersant and 3-6 parts of long aspect ratio particle size cellulose.

Further, the thermal conductivity value of the floating beads and the hollow glass beads is lower than 0.3W/(m.K), and the thermal conductivity value of the flaky aerogel powder is lower than 0.01W/(m.K). By limiting the thermal conductivity, the thermal insulation properties of the coating can be improved. The hollow glass beads are beneficial to enabling the coating to reflect 80-90% of solar radiation heat energy, and effectively reducing the degradation rate of film forming substances in the coating structure, so that the service life of the coating is prolonged, and frequent repair and maintenance are avoided.

Further, the film-forming assistant is propylene glycol methyl enzyme acetate or ethylene glycol. The film forming level of the raw materials of the coating is effectively improved by the aid of the film forming additive and the acrylic emulsion, so that the coating can be rapidly formed into a film in a complex environment.

Further, the wetting dispersant is wan-based sulfate, fatty acid ester sulfate, polyoxyethylene wan-based enzyme or polyoxyethylene polyoxypropylene block copolymer.

Further, the pH regulator is ammonia water or sodium hydroxide solution.

The invention can also comprise auxiliary components such as defoaming agent, preservative and the like.

The invention also provides a preparation method of the thermal super-structured micro-nano energy-saving heat-insulating coating, which comprises the following steps of:

s1, mixing and stirring the flaky superfine titanium dioxide, the flaky aerogel powder and the deionized water for 10 to 15 minutes;

s2, adding the cellulose with the long aspect ratio and the grain diameter and the wetting dispersant into the mixture obtained in the step S1 in sequence, and continuing to stir for 30 minutes;

s3, sequentially adding a defoaming agent and a preservative into the mixture obtained in the step S2, and stirring for 30 minutes;

s4, adding ethylene glycol, a film-forming aid, an acrylic emulsion and a pH regulator into the mixture obtained in the step S3 in sequence, and stirring for 30 minutes;

s5, adding the floating beads and the hollow glass beads into the mixture obtained in the step S4 in sequence, and stirring for 30 minutes.

Compared with the prior art, the invention has the following advantages:

the invention takes the flaky superfine titanium dioxide, the flaky aerogel powder and the cellulose with the particle size of long aspect ratio as the functional components of the thermal super-structure coating for controlling heat, can achieve the covering rate and the decorative effect required by the traditional thermal insulation coating, and has the most key point of exerting the shape effect and the thermal super-structure heat control capability of the micro-nano particles. Through the spherical flaky superfine titanium dioxide (titanium dioxide), flaky aerogel powder and particles and long aspect ratio particle size cellulose, a low-thermal conductivity barrier is constructed in a coating system, the effective transmission efficiency of heat in the coating system is hindered, the physical properties of the raw materials are exerted, the characteristics of high specific surface area and high thermal resistance are combined, and the thermal resistance in the heat transmission process is improved through the compounding of functional components. Therefore, through the structural process design of material optimization and heat transfer process, the low-component addition and high-efficiency heat insulation of the low-heat-resistance material are realized, and further, the effective control of the heat of the outer surface is realized through the thinner coating layer thickness.

Detailed Description

For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the present invention.

In the following examples, the flake aerogel powder manufacturer is Zhejiang rock valley science and technology Limited, product model UG450 series, the flake ultrafine titanium dioxide (titanium dioxide) manufacturer is Panzhihua Meiyun titanium industry Limited, MYR-909 rutile type titanium dioxide, and the aspect ratio of the particles is between 20 and 80.

Example 1

The energy-saving heat-insulating coating comprises the following raw materials in parts by mass:

30 parts of acrylic emulsion, 7 parts of flaky ultrafine titanium dioxide, 4 parts of floating beads, 16 parts of hollow glass microspheres, 19 parts of flaky aerogel powder, 7 parts of film-forming additive, 13 parts of ethylene glycol, 1 part of pH regulator, 2 parts of wetting dispersant, 5 parts of long-aspect ratio particle size cellulose and 10 parts of defoaming agent and preservative respectively.

The preparation method comprises the following steps:

s1, mixing and stirring the flaky ultrafine titanium dioxide, the flaky aerogel powder and deionized water, wherein the mass of the deionized water is one half of the sum of the masses of the flaky ultrafine titanium dioxide and the flaky aerogel powder, and stirring for 15 minutes;

s2, adding the cellulose with the long aspect ratio and the grain diameter and the wetting dispersant into the mixture obtained in the step S1 in sequence, and continuing to stir for 30 minutes;

s3, sequentially adding a defoaming agent and a preservative into the mixture obtained in the step S2, and stirring for 30 minutes;

s4, adding ethylene glycol, a film-forming aid, an acrylic emulsion and a pH regulator into the mixture obtained in the step S3 in sequence, and stirring for 30 minutes;

and S5, sequentially adding the floating beads and the hollow glass beads into the mixture obtained in the step S4, and stirring for 30 minutes to obtain the thermal super-structured micro-nano energy-saving heat-insulating coating.

Example 2

The preparation method is the same as example 1, and the formula is as follows:

35 parts of acrylic emulsion, 7 parts of flaky ultrafine titanium dioxide, 6 parts of floating beads, 18 parts of hollow glass microspheres, 18 parts of flaky aerogel powder, 6 parts of film-forming additive, 14 parts of ethylene glycol, 2 parts of pH regulator, 2 parts of wetting dispersant, 6 parts of long-aspect ratio particle size cellulose, and 12 parts of defoaming agent and preservative respectively.

Example 3

The preparation method is the same as example 1, and the formula is as follows:

37 parts of acrylic emulsion, 6 parts of flaky ultrafine titanium dioxide, 7 parts of floating beads, 15 parts of hollow glass microspheres, 13 parts of flaky aerogel powder, 8 parts of film-forming additive, 14 parts of ethylene glycol, 1 part of pH regulator, 1 part of wetting dispersant, 5 parts of long-aspect ratio particle size cellulose and 8 parts of defoaming agent and preservative respectively.

Example 4 comparative example

37 parts of acrylic emulsion, 6 parts of titanium dioxide (middle core titanium dioxide R-2219), 7 parts of floating beads, 15 parts of hollow glass beads, 13 parts of aerogel (silica aerogel of Shenzhen Zhongji science and technology Limited), 8 parts of film-forming assistant, 14 parts of glycol, 1 part of pH regulator, 1 part of wetting dispersant, 5 parts of hydroxyethyl cellulose (Shandong Yutian chemical industry), and 8 parts of defoaming agent and preservative respectively.

Example 5 Performance testing

The thermal super-structured micro-nano energy-saving heat-insulating coating and the common coating obtained by the comparative example in the embodiment 3 are respectively applied to walls, namely an experimental room and a common room, and the comparative test is as follows:

in the contrast experiment of actual setting, carry out 24 hours indoor outer ambient temperature's monitoring and draw out that the laboratory room is lower than ordinary room temperature in summer, and in winter, the laboratory room is higher than ordinary room temperature, can draw and use hot super structure coating wall body can carry out indoor summer's cooling, indoor intensification in winter.

Index calculation

A common household square meter room with 100 square meters is used as a calculation area, and the area of a wall body in the south direction is 30 square meters. Since the air conditioner is mainly turned on in summer, 6-8 months are used as a main calculation time period. Because the electricity consumption charging is divided into peaks and valleys, the average value of 0.6 yuan per degree of electricity is taken for convenient calculation. For example, the power consumption of 1.5P air conditioner is generally 1.2 degree per hour.

As shown in the following table 2, the power of 546 degrees is saved by a common family in summer, and 327.6 yuan is saved. This is calculated as the cheapest household electricity, and the energy and cost savings to be generalized to public buildings will be even greater.

According to the standard control scale specified in the urban residential area planning and designing standard GB50180-2018 of Ministry of construction, 3000 households or 10000 populations of a residential area are built, and 3000 households can be used as an example, so that 163.8 ten thousand DEG of electricity can be saved in the residential area in summer, and 92.28 ten thousand yuan can be saved. 1 degree electricity is saved, and the emission of carbon dioxide of about 0.997 kg can be reduced, so that the emission of carbon dioxide of 163.75kg is reduced altogether. The purposes of energy conservation and emission reduction are really achieved.

Table 1 energy consumption calculation table

Claims (10)

1. The thermal super-structure micro-nano energy-saving heat-insulating coating is characterized by comprising a thermal super-structure micro-nano material, wherein the thermal super-structure micro-nano material comprises flaky superfine titanium dioxide, flaky aerogel powder and long aspect ratio particle size cellulose.

2. The heat-insulating paint as claimed in claim 1, wherein the length-thickness ratio of the flaky ultrafine titanium dioxide particles is greater than 20, and the particle size is not greater than 200 microns.

3. The thermal insulation coating according to claim 1, wherein the length to thickness ratio of the flake aerogel powder is greater than 20, and the particle size is not greater than 150 μm.

4. A thermal insulating coating according to claim 1, characterised in that the long aspect ratio particle size cellulose has an aspect ratio greater than 10.

5. The heat-insulating coating according to claim 1, characterized by comprising the following raw materials in parts by mass: 28-38 parts of acrylic emulsion, 6-10 parts of flaky ultrafine titanium dioxide, 4-7 parts of floating beads, 10-20 parts of hollow glass microspheres, 10-20 parts of flaky aerogel powder, 5-10 parts of film-forming assistant, 10-15 parts of ethylene glycol, 1-2 parts of pH regulator, 1-2 parts of wetting dispersant and 3-6 parts of long aspect ratio particle size cellulose.

6. The thermal insulation coating as claimed in claim 5, wherein the thermal conductivity values of the floating beads and the hollow glass beads are lower than 0.3W/(m-K), and the thermal conductivity values of the flaky aerogel powder are lower than 0.01W/(m-K).

7. The heat-insulating coating material as claimed in claim 5, wherein the film-forming assistant is propylene glycol methyl enzyme acetate or ethylene glycol.

8. The thermal insulation coating material according to claim 5, wherein the wetting dispersant is Anhui sulfate, fatty acid ester sulfate, polyoxyethylene Anhui trypan enzyme, or polyoxyethylene polyoxypropylene block copolymer.

9. The thermal insulation coating material as claimed in claim 5, wherein the pH regulator is ammonia water or sodium hydroxide solution.

10. A preparation method of a thermal super-structured micro-nano energy-saving heat-insulating coating is characterized by comprising the following steps of:

s1, mixing and stirring the flaky superfine titanium dioxide, the flaky aerogel powder and the deionized water for 10 to 15 minutes;

s2, adding the cellulose with the long aspect ratio and the grain diameter and the wetting dispersant into the mixture obtained in the step S1 in sequence, and continuing to stir for 30 minutes;

s3, sequentially adding a defoaming agent and a preservative into the mixture obtained in the step S2, and stirring for 30 minutes;

s4, adding ethylene glycol, a film-forming aid, an acrylic emulsion and a pH regulator into the mixture obtained in the step S3 in sequence, and stirring for 30 minutes;

s5, adding the floating beads and the hollow glass beads into the mixture obtained in the step S4 in sequence, and stirring for 30 minutes.