A thermal insulation mortar board and its preparation method

Abstract

The present invention discloses a thermal insulation mortar board and a preparation method thereof. The thermal insulation mortar board is prepared from a composition comprising component A and component B: Component A includes 35-88% of filler, 2-10% of polypropylene fiber, 2-8% of aluminum powder, 5-15% of alkaline agent, 1-4% of organic foaming agent, 6-27% of heat insulation material, 8-30% of light reflector, based on the total weight of component A; Component B includes 1-8% of solid resin, 9-22% of ammonia water, 18-40% of styrene-acrylic emulsion, 10-32% of silica sol, 18-39% of water, 0.25-2.7% of other functional additives, based on the total weight of component B; wherein the weight ratio of component A to component B is 1:(1-2). The thermal insulation mortar board has excellent thermal insulation ability and good mechanical properties; meanwhile, it is convenient to apply and has high safety.

Description

Technical Field

[0001] The present invention relates to the technical field of building thermal insulation, and particularly to a thermal insulation mortar board and a preparation method thereof. Background Art

[0002] In recent years, the problems of heat insulation and thermal insulation of buildings have received increasing attention. Heat insulation and thermal insulation can not only improve the energy utilization efficiency of buildings, reduce energy consumption, but also improve the living environment and enhance the comfort of occupants. At present, the most common thermal insulation material for building exterior walls is exterior wall thermal insulation mortar, which is made by using the principle of bubble heat insulation and adding a certain amount of thermal insulation materials and admixtures, and has good heat insulation performance and energy consumption reduction effect. Compared with ordinary mortar, exterior wall thermal insulation mortar can better maintain the indoor temperature and reduce the influence of cold and heat bridges on the interior.

[0003] Ordinary thermal insulation mortar materials use a large amount of lightweight materials, need to be thickly coated during use, and at the same time, the thermal insulation mortar has no decorative property and needs to be protected by a protective layer. For example, after the exterior wall is finished with thermal insulation mortar, tiles need to be pasted or exterior wall paint needs to be applied. Therefore, further research on thermal insulation mortar materials is still needed to improve their performance and application convenience. Summary of the Invention

[0004] In view of this, the present invention provides a thermal insulation mortar board and a preparation method thereof. The thermal insulation mortar board has excellent heat insulation and thermal insulation capabilities and good mechanical properties; at the same time, it is convenient to apply and has high safety.

[0005] The present invention provides the following technical solutions:

[0006] A thermal insulation mortar board is prepared from a composition comprising component A and component B; wherein, component A comprises 35 - 88% filler, 2 - 10% polypropylene fiber, 2 - 8% aluminum powder, 5 - 15% alkaline agent, 1 - 4% organic foaming agent, 6 - 27% thermal insulation material, 8 - 30% light reflector, based on the total weight of component A; component B comprises 1 - 8% solid resin, 9 - 22% ammonia water, 18 - 40% styrene-acrylic emulsion, 10 - 32% silica sol, 18 - 39% water, 0.25 - 2.7% other functional additives, based on the total weight of component B; wherein the weight ratio of component A to component B is 1:(1 - 2).

[0007] Optionally, the weight ratio of the content of the thermal insulation material to the sum of the contents of the solid resin and the styrene-acrylic emulsion is 1:(1 - 2).

[0008] Optionally, the thermal insulation material comprises SiO2 aerogel and wood chips; the specific surface area of the SiO2 aerogel is 200 - 1000m 2 / g, with a porosity of 80 - 99.8%; the average particle size of the wood chips is 48 - 80 mesh.

[0009] Optionally, the filler includes one or more of quartz powder, calcium carbonate, and magnesium carbonate.

[0010] Optionally, the filler includes 15 - 35% of quartz powder and 15 - 35% of calcium carbonate, based on the weight of component A.

[0011] Optionally, the aluminum powder includes one or more of aluminum oxide or aluminum silicate, with an average particle size of 400 - 600 mesh; other functional aids include 0.2 - 1% of a leveling agent, 0.05 - 1.2% of a preservative, and 0.02 - 0.5% of a thickener, based on the total weight of component B.

[0012] Optionally, the glass transition temperature of the solid resin is 30°C to 85°C; the solid resin is one or more of acrylic resin, polyurethane resin, and epoxy resin.

[0013] Optionally, the thickness of the thermal insulation mortar board is 4 - 6 mm.

[0014] Optionally, a decorative layer is further provided on the surface of the thermal insulation mortar board; the decorative layer includes 0.5 - 10% of color paste, 85 - 99.5% of styrene-acrylic emulsion, 0.01 - 1% of thickener, 0.05 - 0.9% of defoamer, and 0 - 1% of preservative, based on the weight of the decorative layer.

[0015] The present invention also provides a method for preparing the thermal insulation mortar board as described above, which includes the following steps: 1) Mix the filler, polypropylene fiber, aluminum powder, alkaline agent, organic foaming agent, heat insulation material, and light reflector to obtain component A; 2) Mix the solid resin with ammonia water until the solid resin is completely dissolved to obtain an aqueous solution of the solid resin; mix the obtained aqueous solution of the solid resin, styrene-acrylic emulsion, other functional aids, silica sol, and water to obtain component B; 3) Mix component A and component B evenly to obtain a composition containing component A and component B; 4) Inject the composition obtained in step 3) into a mold and dry the mold to obtain the thermal insulation mortar board.

[0016] According to the technical solution of the present invention, the thermal insulation mortar board contains specific contents of each component, making the thermal insulation mortar board have excellent thermal insulation ability and good mechanical properties; at the same time, it is convenient to use and has high safety. Specifically, in the thermal insulation mortar board, the aluminum powder and the alkaline agent act synergistically to improve the bonding strength between the components, and SiO2 aerogel, wood chips, organic styrene-acrylic emulsion, and the reflective heat insulation agent are connected together with the formed bubbles and / or pores to form a three-dimensional network hollow structure with extremely low thermal conductivity, which can effectively prevent heat conduction and has excellent heat insulation; at the same time, the thermal insulation mortar board has excellent mechanical properties. Detailed implementation mode

[0017] For ease of understanding of the present invention, the present invention will be described more comprehensively below with reference to the embodiments. Preferred embodiments of the present invention are given in the embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0018] At present, a large amount of light particles are added to the thermal insulation mortar, making its own density low and its own hardness poor, and it is easily damaged by the outside world. The mortar itself does not have decorative properties and has low self-strength. After construction, a decorative protective layer needs to be made again. For example, after the exterior wall is finished with thermal insulation mortar, tiles need to be pasted or exterior wall paint needs to be applied. In order to achieve the required thermal insulation effect, the thermal insulation mortar needs to be thickly coated with 2-3 cm, and generally it needs to be constructed in 2-3 times to reach the thickness. The construction is complex, and it is easy to have air pockets, cracks, and peeling, which will cause safety accidents. The thermal insulation mortar board of the embodiment of the present invention can further improve the above disadvantages. It has excellent thermal insulation ability and extremely low thermal conductivity; at the same time, the thickness of the thermal insulation mortar board is only 4-6 mm, and it can be firmly fixed on the surface of the building with tile adhesive and will not fall off and cause safety accidents. Specifically, in the thermal insulation mortar board of the embodiment of the present invention, the synergistic effect of aluminum powder and alkaline agent can improve the bonding strength between the components. The heat insulation material, organic styrene-acrylic emulsion, light reflector are connected together with the formed bubbles and / or pores to form a three-dimensional network hollow structure with extremely low thermal conductivity, which can effectively prevent heat conduction and has excellent heat insulation; at the same time, the thermal insulation mortar board has excellent mechanical properties.

[0019] In the embodiment of the present invention, the thermal insulation mortar board is prepared from a composition comprising component A and component B: Component A includes 35-88%, such as 45-55%, of filler, 2-10%, such as 4-6%, of polypropylene fiber, 2-8%, such as 4-6%, of aluminum powder, 5-15%, such as 7-8%, of alkaline agent, 1-4%, such as 1-2.5%, of organic foaming agent, 6-27%, such as 15-21%, of heat insulation material, 8-30%, such as 10-20%, of light reflector, based on the total weight of component A; Component B includes 1-8%, such as 2-4%, of solid resin, 9-22%, such as 10-20%, of ammonia water, 18-40%, such as 25-35%, of styrene-acrylic emulsion, 10-32%, such as 15-25%, of silica sol, 18-39%, such as 20-35%, of water, 0.25-2.7%, such as 0.5-1.5%, of other functional auxiliaries, based on the total weight of component B; wherein the weight ratio of component A to component B is 1:(1-2). Those skilled in the art should understand that the components in component B do not have to be used together with the components in component B, and can also be used together with the components in component A, and the use mode of all components can be selected according to needs.

[0020] The weight ratio of the sum of the contents of SiO2 aerogel and wood chips to the sum of the contents of solid resin and styrene-acrylic emulsion is 1:(1 - 2), for example 1:1.6.

[0021] The filler may include one or more of quartz powder, calcium carbonate, and magnesium carbonate; the filler may include 15 - 35%, for example 20 - 30%, of quartz powder, and 15 - 35%, for example 20 - 30%, of calcium carbonate, based on the weight of component A. The quartz powder is the quartz powder well-known in the art, also called white sand powder; the average particle size is 600 - 800 mesh; in the quartz powder, the content of silicon dioxide is 80 - 99%, for example 98%, based on the weight of the quartz powder. The calcium carbonate may include light calcium carbonate or heavy calcium carbonate (also called heavy calcium), for example heavy calcium carbonate; the average particle size of the calcium carbonate is usually 200 - 600 mesh, for example 200 - 400 mesh, for example 200 mesh.

[0022] The polypropylene fiber is a synthetic fiber spun from polypropylene, and its fiber length can be 2 - 8 mm, for example 4 - 7 mm, for example 6 mm; it increases the toughness of the mortar board coating and slows down the damage of the external impact force to the mortar board.

[0023] The aluminum powder usually may include one or more of aluminum oxide or aluminum silicate, and the average particle size can be 400 - 600 mesh; the aluminate gel substance produced by the aluminum ions in the aluminum powder and the alkali in the composition, such as calcium hydroxide, can bond each component during the solidification process of the mortar board, increasing the bonding strength between each component, thereby improving the mechanical strength of the thermal insulation mortar board.

[0024] The alkaline agent is a metal hydroxide, such as calcium hydroxide, magnesium hydroxide, aluminum hydroxide, etc. The organic foaming agent is usually the powdery foaming agent well-known to those skilled in the art, for example usually one or more of sodium alkylbenzene sulfonate, such as sodium dodecylbenzene sulfonate, and sodium alkyl sulfate.

[0025] The heat insulation material includes one or more of SiO2 aerogel and wood chips. Usually, the heat insulation material may include 4 - 17% of SiO2 aerogel and 2 - 10% of wood chips, based on the total weight of component A. SiO2 aerogel is a nano-porous solid material, which has the characteristics of low thermal conductivity, low density, large specific surface area, high porosity, and small pores. The room temperature thermal conductivity of SiO2 aerogel can be as low as 0.012 W / (m·k), and the density can be as low as 3 kg / m 3 , and the specific surface area is 200 - 1000 m 2 / g, the porosity is as high as 80 - 99.8%, and the size of the pores is 1 - 100 nm. The average particle size of the wood chips can be 48 - 80 mesh; the wood chips are loose and have a tiny pore structure, which can reduce the thermal conductivity and thus slow down the heat energy transfer.

[0026] The light reflectants include mica powder, titanium dioxide, zirconia, pearlescent powder, aluminum silver paste, glass hollow microspheres, etc. The average particle size of mica powder is 600 - 800 mesh, usually in flake structure, which has good light reflection effect while offsetting the shrinkage stress during the film-forming process of the thermal insulation mortar board and reducing cracking. The titanium dioxide can be rutile titanium dioxide with an average particle size of 1200 - 1500 mesh. The light reflectants can include 5 - 18% of mica powder and 3 - 10% of titanium dioxide, based on the total weight of component A.

[0027] The glass transition temperature of the solid resin is 30°C to 85°C; the solid resin is usually one or more of acrylic resin, polyurethane resin, and epoxy resin. The number average molecular weight (Mn) of the solid resin is 2000 - 9000 g / mol, determined by gel permeation chromatography. The acrylic resin can be the aqueous acrylic solid resin J678 purchased from BASF Chemical Company; the polyurethane resin can be the 8355 aqueous polyurethane emulsion purchased from Wanhua Chemical Group Co., Ltd. At room temperature and normal pressure, the concentration of the ammonia water used is usually 20 - 25%, based on the weight of the ammonia water.

[0028] Styrene - acrylic latex is an anionic emulsion copolymerized from styrene and acrylate, etc. Its glass transition temperature can be 15 - 18°C, and the solid content is 40 - 60%, such as 40 - 50%, such as 45 - 47%; styrene - acrylic latex can include epoxy - modified styrene - acrylic latex, silicone - modified styrene - acrylic latex, and organofluorine - modified styrene - acrylic latex, etc. Styrene - acrylic latex bonds each component and at the same time improves the flexibility and gloss of the thermal insulation mortar board.

[0029] Other functional additives can include 0.2 - 1% of leveling agent, 0.05 - 1.2% of preservative, and 0.02 - 0.5% of thickener, based on the total weight of component B. The leveling agent is of acrylic type, such as polyacrylate solution; or silicone - type leveling agent, such as polydimethylsiloxane or polymethylphenylsiloxane. The preservative includes at least one of Kathon, benzisothiazolinone (BIT), etc. The thickener can be any commonly used thickener well - known to those skilled in the art, such as polyurethane thickener, which can increase the viscosity of the liquid agent and avoid delamination.

[0030] Silica sol is a homogeneous and stable dispersion formed by amorphous, nanoscale silica particles in water or organic solvents. The particle size distribution range of the silica particles is usually 3 - 150 μm, such as 9 - 20 μm; the solid content of silica sol is 20 - 32%. The silica sol with fine particle size reacts with alkali to form silicate gel substances to bond each component, thereby improving the hardness of the mortar board.

[0031] Optionally, the thermal insulation mortar board is prepared from a composition comprising Component A and Component B, wherein Component A includes 15-35%, such as 25%, quartz powder, 2-10%, such as 5%, polypropylene fiber, 2-8%, such as 5%, aluminum powder, 5-15%, such as 8%, calcium hydroxide, 1-4%, such as 2%, organic foaming agent, 15-35%, such as 25%, heavy calcium carbonate, 4-17%, such as 10%, SiO2 aerogel, 2-10%, such as 5%, wood chips, 5-18%, such as 5-10%, mica powder, 3-10%, such as 3-6%, titanium dioxide, based on the total weight of Component A; Component B includes 1-8%, such as 2-4%, solid resin, 9-22%, such as 16%, ammonia water with a concentration of 20%, 18-40%, such as 30%, styrene-acrylic emulsion, 0.2-1%, such as 0.5%, leveling agent, 0.05-1.2%, such as 0.4%, preservative, 10-32%, such as 20%, silica sol, 18-39%, such as 29%, water, 0.02-0.5%, such as 0.1%, thickener, based on the total weight of Component B; wherein the weight ratio of Component A to Component B is 1:(1-2), such as 1:(1-1.5), such as 1:(1.1-1.3).

[0032] The surface of the thermal insulation mortar board may also be provided with a decorative layer containing various required patterns or colors, whereby it has the same decorative property as tiles and can be directly exposed for use without adding a protective layer.

[0033] The decorative layer includes 0.5-10%, such as 2%, color paste, 85-99.5%, such as 97.5%, styrene-acrylic emulsion, 0.01-1%, such as 0.2%, thickener, 0.05-0.9%, such as 0.2%, defoaming agent, 0-1%, such as 0.1%, preservative, based on the weight of the decorative layer. The sum of the contents of the components of the decorative layer is 100%, based on the weight of the decorative layer. The type of the color paste can be selected according to needs. The styrene-acrylic emulsion, thickener, and preservative are as defined in Component B. The styrene-acrylic emulsion, thickener, and preservative used in the decorative layer may be the same as or different from those in Component B.

[0034] The color paste can be any type of color paste commonly used in the art with excellent weather resistance and light resistance, such as iron-based color pastes (yellow, red, and black), phthalocyanine-based.

[0035] The defoamer may include one or more of silicone defoamers and mineral oil defoamers. Commonly used silicone defoamers are usually prepared by using silicone oil as the basic component and mixing appropriate solvents, emulsifiers or inorganic fillers. Mineral oil defoamers are usually prepared with mineral oil, inorganic hydrophobic particles and emulsifiers as the main defoaming components. The silicone defoamer may be selected from Grade 105509 purchased from Guangzhou Kefeng Chemical Co., Ltd. and Grade CI-0560 purchased from Guangdong Nanhui New Materials Co., Ltd.; the mineral oil defoamer may be Grade B-638 purchased from Guangdong Zhongke Hongtai New Materials Co., Ltd.

[0036] In this embodiment, the "average particle size" of all solid particles included in the composition refers to the sieve pore size corresponding to a cumulative weight percentage on the sieve of 50%, which is measured by a mechanical method according to GB / T 21524-2008.

[0037] In an embodiment of the present invention, the method for preparing the above-mentioned thermal insulation mortar board includes the following steps: 1) Mixing a filler, polypropylene fiber, aluminum powder, alkaline agent, organic foaming agent, heat insulating material, and light reflector to obtain Component A; 2) Mixing a solid resin and ammonia water until the solid resin is completely dissolved to obtain an aqueous solution of the solid resin; mixing the obtained aqueous solution of the solid resin, styrene-acrylic emulsion, silica sol, water, and other functional additives to obtain Component B; 3) Mixing Component A and Component B evenly to obtain a composition containing Component A and Component B; 4) Injecting the composition obtained in step 3) into a mold and drying the mold to obtain a thermal insulation mortar board.

[0038] Optionally, the method for preparing the above-mentioned thermal insulation mortar board includes the following steps:

[0039] 1) Mixing quartz powder, mica powder, polypropylene fiber, aluminum powder, calcium hydroxide, organic foaming agent, heavy calcium carbonate, SiO2 aerogel, wood chips, and titanium dioxide to obtain Component A;

[0040] 2) Mixing a solid resin and ammonia water until the solid resin is completely dissolved to obtain an aqueous solution of the solid resin; mixing the obtained aqueous solution of the solid resin, styrene-acrylic emulsion, leveling agent, silica sol, water, thickening agent, and preservative to obtain Component B;

[0041] 3) Mixing Component A and Component B evenly to obtain a composition containing Component A and Component B;

[0042] 4) Injecting the composition obtained in step 3) into a mold and drying the mold to obtain a thermal insulation mortar board.

[0043] Step 1) includes putting the above-mentioned amounts of quartz powder, mica powder, polypropylene fiber, aluminum powder, calcium hydroxide, organic foaming agent, heavy calcium carbonate, SiO2 aerogel, wood chips, and titanium dioxide into a dry powder stirring kettle, and stirring at a stirring rate of 300 - 600 r / min for 10 - 40 min, such as 20 min, to make the components mix evenly and obtain Component A.

[0044] Step 2) includes adding solid resin and 20% ammonia water to a dispersion kettle, dispersing at a stirring rate of 800 - 1000 r / min for 60 - 80 min, ensuring that the temperature of the ammonia water is not lower than 50 °C during dispersion until the solid resin is completely dissolved, and cooling to room temperature to obtain an aqueous solution of solid resin, where the solid content of the aqueous solution of solid resin is 20 - 50%, such as 30%, based on the weight of the aqueous solution of solid resin; where the weight ratio of the solid resin to 20% ammonia water is 1:(2 - 8), such as 1:4. Add the obtained aqueous solution of solid resin, styrene-acrylic emulsion, leveling agent, silica sol, water, thickener, and preservative to the dispersion kettle, and stir at a stirring rate of 600 - 800 r / min for 10 - 40 min, such as 20 min, to make the components mix evenly and obtain Component B.

[0045] Step 4) includes coating the mold with an oily mold release agent such as machine oil, injecting the composition obtained in Step 3) into the mold, and after the composition flows evenly and reaches a thickness of 5 - 8 mm, sending the mold to be baked at a temperature of 80 - 100 °C until a mortar board with a water content lower than 1.0% is formed, and cooling the mortar board to 30 - 60 °C, such as 40 °C, to obtain a heat-insulating mortar board with a thickness of 4 - 6 mm.

[0046] In an embodiment of the present invention, the method for preparing the above-mentioned heat-insulating mortar board with a decorative function further includes mixing styrene-acrylic emulsion, color paste, defoaming agent, and thickener to obtain Component C; coating Component C on the surface of the above-mentioned heat-insulating mortar board to form a desired pattern or color, and then drying the coated heat-insulating mortar board, such as baking at a temperature of 60 - 70 °C for 20 - 50 min, such as 30 min, to obtain a heat-insulating mortar board with a decorative function.

[0047] Mixing the styrene-acrylic emulsion, color paste, defoaming agent, and thickener includes adding the styrene-acrylic emulsion, color paste, defoaming agent, and thickener to a dispersion kettle, and stirring at a stirring rate of 600 - 800 r / min for 10 - 40 min, such as 20 min, to obtain Component C.

[0048] The construction method of the heat-insulating mortar board according to the embodiment of the present invention includes bonding the heat-insulating mortar board to the surface of a building using tile adhesive, such as the tile adhesive meeting the requirements of JCT 547 - 2017 C1 type.

[0049] Optionally, the construction method of the heat-insulating mortar board includes:

[0050] i) Clean the building surface, for example, remove weathered materials, putty, paint, grease, wax, dirt, loose materials, and any mildew, mold or algae on the building surface, repair holes and cracks, and chisel and level the hollow parts;

[0051] ii) First, evenly apply tile adhesive on the building surface, and at the same time, apply tile adhesive on the back of the thermal insulation mortar board in the embodiment of the present invention, and then paste the thermal insulation mortar board on the building surface; the bonding is uniform and the mortar board is fixed to ensure that the thermal insulation mortar board does not slip;

[0052] iii) The freshly pasted mortar board cannot be washed or damaged by rain; stepping on it or other actions that damage the paint film are not allowed within 48 hours after pasting; the room temperature during winter construction is not lower than 5°C.

[0053] The present invention will be described below through specific embodiments. The embodiments described below are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention. For those without specific technical or conditions noted in the embodiments, the techniques or conditions described in the literature in this field or according to the product specifications are followed. For reagents or instruments without the manufacturer noted, they are all conventional products that can be obtained through commercial purchase.

[0054] Raw materials

[0055] Quartz powder: Purchased from Sichuan Nanlian Environmental Resources Technology Co., Ltd., with an average particle size of 600 mesh (25μm) and a Mohs hardness of 7.5;

[0056] Mica powder: Purchased from Anhui Gerui New Materials Technology Co., Ltd., type GB-2, with an average particle size of 600 mesh;

[0057] Polypropylene fiber: Shandong Baiyou Engineering Materials Co., Ltd., fiber length 6mm;

[0058] Aluminum powder: Aluminum oxide, with an average particle size of 500 mesh (30μm), purchased from Hebei Kuoxiang Alloy Materials Co., Ltd.;

[0059] Calcium hydroxide: Purchased from Jinan Longteng Chemical Co., Ltd., model 14-2-8;

[0060] Foaming agent: Foshan Daping Chemical Technology Co., Ltd., sodium dodecyl benzene sulfonate LAS-70;

[0061] Heavy calcium: The average particle diameter of the particles is 200 mesh (74μm), purchased from Jiaoling Jinpeng Fine Chemical Co., Ltd.;

[0062] SiO2 aerogel: Hebei LingShou County Jinyuan Mining Industry Processing Factory, models 2223 and 336; specific surface areas are 200m 2 / g, 1000m2 / g;

[0063] Wood chips: Nanchang Jiahong Wood Powder Co., Ltd., average particle size of 48 mesh;

[0064] Titanium dioxide: Model R-215, purchased from Huizhou Biaozhou Industrial Co., Ltd., average particle size of 1250 mesh (10 μm);

[0065] Solid resin: Purchased from BASF (China) Co., Ltd., waterborne acrylic resin, model J678, Tg of 85 °C, molecular weight (Mn) of 8600 g / mol;

[0066] Styrene-acrylic emulsion type I: Purchased from Foshan Shunde Badifu Industrial Co., Ltd., model 6607, Tg of 16 °C, solid content of 45 wt%;

[0067] Styrene-acrylic emulsion type II: Purchased from Foshan Shunde Badifu Industrial Co., Ltd., model 6992A, Tg of 18 °C, solid content of 47 wt%;

[0068] Leveling agent: BYK Chemie GmbH, model BYK-358N;

[0069] Silica sol: Taizhou Xiesheng Precision Casting Technology Co., Ltd., model GRJ30, particle size distribution range of silicon dioxide particles is 9 - 20 μm;

[0070] Color paste: Guangzhou Cody Color Paste Co., Ltd., iron-based color paste in red;

[0071] Thickener: Polyurethane thickener, model N-2253, purchased from Foshan Shenghui New Materials Co., Ltd

[0072] Preservative: Kathon, purchased from Foshan Lanfeng Additives Co., Ltd.

[0073] Example 1

[0074] Before starting work, clean the production equipment such as pipelines, dispersers, and packaging machines.

[0075] 1. Put quartz powder, mica powder, polypropylene fiber, aluminum powder, calcium hydroxide, foaming agent, heavy calcium, SiO2 aerogel, wood chips, and titanium dioxide into the dry powder stirring kettle according to the amounts described in Table 1, stir at 500 r / min for 20 min to obtain Component A. After passing the in-process inspection, set it aside for later use;

[0076] 2. Put the solid resin in the amount described in Table 1 and 20% ammonia water into the dispersing kettle, start the dispersing kettle, and disperse at a stirring rate of 1000 r / min for 70 min. During the dispersion, ensure that the temperature of the ammonia water is not lower than 50 °C until the solid resin is completely dissolved to obtain an aqueous solution of solid resin, and let it cool to room temperature for later use;

[0077] Add the obtained solid resin aqueous solution, styrene-acrylic emulsion, leveling agent, silica sol, water, thickener, and preservative in the amounts described in Table 1 to a dispersion kettle, stir at 700 r / min for 20 min to obtain Component B. After passing the in-process inspection, set it aside for later use.

[0078] 3. Mix Component A and Component B evenly in a mass ratio of 1:1.2 to obtain a composition; inject the composition into a mold with specifications of 30 cm × 60 cm. The mold has been coated with machine oil before adding the composition, so that the thickness of the composition in the mold is 5.5 mm. After the mortar has leveled evenly, send the mold to an environment at 100 °C and bake for 100 min until the water content in the mortar board is lower than 1.0%, and then cool down to 40 °C to obtain a mortar board with a thickness of 4.8 mm.

[0079] The specific composition of the mortar board is summarized in Tables 1 and 2.

[0080] Examples 2 - 7 and Comparative Examples 1 - 6

[0081] Repeat the steps of Example 1, with the difference that the contents and types of each component in each component are adjusted. See Tables 1 and 2 for details.

[0082] Example 8

[0083] Repeat the steps of Example 1, with the difference that Component C is coated on the surface of the mortar board obtained in Example 1, and then baked at a temperature of 65 °C for 30 min to obtain a decorative thermal insulation mortar board with a red surface; wherein Component C includes 2 parts by weight of red iron-based color paste, 97.5 parts by weight of type II styrene-acrylic emulsion, 0.2 parts by weight of thickener, 0.2 parts by weight of defoamer, and 0.1 parts by weight of preservative. See Table 3 for the performance of the obtained decorative thermal insulation mortar board.

[0084] Table 1 Composition of Component A of the Thermal Insulation Mortar Boards in Examples 1 - 7 and Comparative Examples 1 - 6

[0085]

[0086] Table 2 Composition of Component B of the Thermal Insulation Mortar Boards in Examples 1 - 7 and Comparative Examples 1 - 6 and the Weight Ratio of A to B

[0087]

[0088] Performance Testing

[0089] Conduct performance testing on the mortar boards of each example and comparative example according to the requirements of GBT 20473 - 2006 Type II.

[0090] In addition, the pencil hardness of the mortar boards of the embodiments of the present invention tested according to GB / T 6739-2006 all reached the 3HB grade, fully meeting the hardness requirements for outdoor use. The test results are summarized in Table 3.

[0091] Table 3 Performance Tests of Mortar Boards of Each Embodiment and Comparative Example

[0092] Number Compressive strength / MPa Thermal conductivity / (W / (m·K)) Linear shrinkage rate / % Example 1 17.6 0.063 0.18 Example 2 16.0 0.058 0.19 Example 3 17.2 0.073 0.2 Example 4 17.1 0.081 0.2 Example 5 16.5 0.057 0.19 Example 6 16.1 0.073 0.18 Example 7 15.9 0.071 0.19 Example 8 17.6 0.063 0.18 Comparative Example 1 15.6 0.116 0.2 Comparative Example 2 15.5 0.098 0.19 Comparative Example 3 15.2 0.091 0.21 Comparative Example 4 14.1 0.087 0.25 Comparative Example 5 13.4 0.09 0.22 Comparative Example 6 13.2 0.094 0.32

[0093] According to the technical solution of the embodiment of the present invention, the thermal conductivity of the thermal insulation mortar board is very low, thus having excellent heat insulation and heat preservation capabilities; and its compressive strength is relatively high and the linear shrinkage rate is relatively low, and it has a hardness of 3HB grade. Therefore, the thermal insulation mortar board has excellent mechanical properties such as strength, hardness and dimensional stability; at the same time, its thickness is small, it is convenient to apply, and it has high safety.

[0094] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A heat-insulating mortar board, characterized in that, Prepared from a composition comprising Component A and Component B; wherein, Component A comprises 35 - 88% filler, 2 - 10% polypropylene fiber, 2 - 8% alumina and / or aluminum silicate, 5 - 15% alkaline agent, 1 - 4% organic foaming agent, 6 - 27% heat insulating material, 8 - 30% light reflector, based on the total weight of Component A; the alkaline agent is a metal hydroxide capable of reacting with the alumina and / or aluminum silicate to form an aluminate gel substance; Component B comprises 1 - 8% solid resin, 9 - 22% ammonia water, 18 - 40% styrene-acrylic emulsion, 10 - 32% silica sol, 18 - 39% water, 0.25 - 2.7% other functional aids, based on the total weight of Component B; the solid resin is an acrylic resin; wherein the weight ratio of Component A to Component B is 1:(1 - 2).

2. The thermal insulation mortar board according to claim 1, wherein The weight ratio of the content of the heat insulating material to the sum of the contents of the solid resin and the styrene-acrylic emulsion is 1:(1 - 2).

3. The thermal insulation mortar board according to claim 1 or 2, characterized in that, The thermal insulation material includes SiO2 aerogel and wood chips; the specific surface area of the SiO2 aerogel is 200 - 1000 m 2 / g, and the porosity is 80 - 99.8%; the average particle size of the wood chips is 48 - 80 mesh.

4. The heat-insulating mortar board according to claim 1 or 2, characterized in that, The filler comprises one or more of quartz powder, calcium carbonate, and magnesium carbonate.

5. The thermal insulation mortar board according to claim 4, characterized in that, The filler comprises 15 - 35% quartz powder and 15 - 35% calcium carbonate, based on the weight of Component A.

6. The thermal insulation mortar board according to claim 1 or 2, characterized in that The average particle size of the alumina and / or aluminum silicate is 400 - 600 mesh; other functional aids include 0.2 - 1% leveling agent, 0.05 - 1.2% preservative, 0.02 - 0.5% thickener, based on the total weight of Component B.

7. The heat-insulating mortar board according to claim 1 or 2, characterized in that The glass transition temperature of the solid resin is 30°C to 85°C.

8. The heat-insulating mortar board according to claim 1 or 2, characterized in that The thickness of the thermal insulation mortar board is 4 - 6 mm.

9. The thermal insulation mortar board according to claim 1 or 2, characterized in that, The surface of the thermal insulation mortar board is further provided with a decorative layer; the decorative layer comprises 0.5 - 10% color paste, 85 - 99.5% styrene-acrylic emulsion, 0.01 - 1% thickener, 0.05 - 0.9% defoaming agent, and 0 - 1% preservative, based on the weight of the decorative layer.

10. A method for preparing the thermal insulation mortar board according to any one of claims 1-9, characterized in that, Including the following steps: 1) Mix the filler, polypropylene fiber, alumina and / or aluminum silicate, alkaline agent, organic foaming agent, heat insulating material, and light reflector to obtain Component A; 2) Mix the solid resin with ammonia water until the solid resin is completely dissolved to obtain an aqueous solution of the solid resin; mix the obtained aqueous solution of the solid resin, styrene-acrylic emulsion, other functional aids, silica sol, and water to obtain Component B; 3) Mix Component A and Component B evenly to obtain a composition comprising Component A and Component B; 4) Inject the composition obtained in step 3) into a mold, and dry the mold to obtain a thermal insulation mortar board.

Images