Thermal insulation mortar as well as preparation method and application thereof

Abstract

The invention relates to the technical field of building materials, and discloses thermal insulation mortar as well as a preparation method and application thereof. The thermal insulation mortar comprises a dry material and a liquid material, the dry material comprises the following components: cement clinker, river sand, filler and redispersible latex powder; the liquid material comprises the following components: water and a heat-insulating emulsion; the mass ratio of the dry material to the liquid material is (2.0-2.6): 1. The thermal insulation mortar provided by the invention is simple in component, the thermal insulation emulsion is used as a functional thermal insulation raw material, the mortar can have a good reflective insulation effect, the mechanical properties such as tensile adhesive strength and compressive strength are improved, dry materials and liquid materials are mixed according to a specific proportion, the sand falling phenomenon during construction can be avoided, and the constructability is good.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a thermal insulation mortar and a preparation method and application thereof. Background Art

[0002] Energy-saving buildings are a new type of building that is energy-saving, environmentally friendly and comfortable. New urban buildings are developing in the direction of green, low energy consumption and zero energy consumption. Improving the insulation effect of living space is an important part of developing energy-saving buildings and is the key to improving energy efficiency and enhancing building comfort and functionality.

[0003] Reflective thermal insulation coating refers to a functional coating with high solar reflectance and high hemispherical reflectivity, which has the functions of reflecting sunlight and heat insulation. Thermal insulation mortar is a functional coating commonly used for internal insulation of exterior walls. The thermal insulation mortar on the market is usually a dry mortar made by mixing various lightweight materials as aggregates, cement as a gelling material, and some modified additives. The main thermal insulation mortars can be divided into two categories: inorganic thermal insulation mortars and organic thermal insulation mortars. The former includes the use of thermal insulation materials such as glass beads, composite aluminum silicate, expanded vermiculite, aerated concrete, and microporous calcium silicate; the latter includes the use of thermal insulation materials such as polystyrene, polyurethane, polyvinyl chloride, and urea formaldehyde.

[0004] Both inorganic thermal insulation mortar and organic thermal insulation mortar have certain thermal insulation effects, but they also have certain defects in practical applications. Among organic thermal insulation mortars, organic thermal insulation materials such as extruded polystyrene insulation board (XPS), expanded polystyrene (EPS) and polyurethane (PU) are easy to burn and have great safety hazards; among inorganic thermal insulation mortars, lightweight porous wall materials such as aerated concrete, glass beads, and microporous calcium silicate have low strength, easy to absorb water, and easy to crack; these defects limit the application of thermal insulation mortar in the field of energy-saving buildings. Summary of the invention

[0005] The present invention aims to solve at least one of the above-mentioned technical problems existing in the prior art. To this end, one of the purposes of the present invention is to provide a thermal insulation mortar; the second purpose of the present invention is to provide a preparation method of the thermal insulation mortar; the third purpose of the present invention is to provide an application of the thermal insulation mortar.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A first aspect of the present invention provides a thermal insulation mortar, comprising a dry material and a liquid material;

[0008] The dry materials include the following components: cement clinker, river sand, filler, and redispersible latex powder;

[0009] The liquid material comprises the following components: water, thermal insulation emulsion;

[0010] The mass ratio of the dry material to the liquid material is (2.0-2.6):1.

[0011] Preferably, the cement clinker includes at least one of 42.5 grade ordinary Portland cement and 32.5 grade ordinary Portland cement.

[0012] Preferably, the particle size of the river sand is 70-140 mesh.

[0013] Preferably, the particle size of the filler is 200-300 mesh.

[0014] Preferably, the filler includes at least one of fly ash, quartz powder and double fly ash.

[0015] Preferably, the dry material further comprises a thickener and a water reducing agent.

[0016] Preferably, the thickener includes hydroxypropyl methylcellulose ether; preferably at least one of PMK-50Z from Shanghai Huiguang Fine Chemical Co., Ltd., CR8020AM from Silver Eagle Chemical Fiber Co., Ltd., and BX165M from Northern Tianpu Cellulose Co., Ltd.

[0017] Preferably, the water reducer includes at least one of lignin sulfonate water reducer, naphthalene-based high-efficiency water reducer, melamine-based high-efficiency water reducer, and polycarboxylate water reducer; preferably, the water reducer is a polycarboxylate water reducer; preferably, Sika -540P, Jiangsu Fujilia Building Materials Co., Ltd. FJ70 or at least one of them.

[0018] Preferably, the redispersible latex powder includes at least one of vinyl acetate-ethylene redispersible latex powder, styrene acrylic dispersible latex powder, styrene-butadiene latex powder, and vinyl acetate homopolymer latex powder; preferably at least one of Wacker 5010N, Jiangsu Fujilia Building Materials Co., Ltd. redispersible latex powder FJ6010, Elite FX2350, and Dalian Chemical redispersible latex powder DA-1100K.

[0019] Preferably, the thermal insulation emulsion is a core-shell emulsion.

[0020] Preferably, the particle size of the core-shell emulsion is 1000-2000 nm, and the inner core particle size is 300-600 nm.

[0021] Preferably, the solid content of the core-shell emulsion is 40-55 wt %.

[0022] Preferably, the thermal insulation emulsion includes at least one of a core-shell silicone-acrylic emulsion and a core-shell acrylic emulsion.

[0023] Preferably, the core-shell acrylic emulsion is prepared by a method comprising the following steps:

[0024] 1) reacting an emulsifier, an unsaturated acid, an olefin monomer, an initiator, a siloxane compound with an active group and water to obtain a seed emulsion;

[0025] 2) reacting an emulsifier, an unsaturated acid, an olefin monomer, an initiator, a seed emulsion and water to obtain the core-shell acrylic emulsion.

[0026] Preferably, the emulsifier is selected from at least one of sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether, polyoxyethylene alkyl ester, and sodium cetyl betaine.

[0027] Preferably, the unsaturated acid is selected from at least one of acrylic acid, methacrylic acid, itaconic acid and fumaric acid.

[0028] Preferably, the olefin monomer is selected from at least one of styrene, methyl methacrylate, butyl acrylate, acrylonitrile and isooctyl acrylate.

[0029] Preferably, the initiator is selected from at least one of sodium persulfate, ammonium persulfate and potassium persulfate.

[0030] Preferably, the siloxane compound with active groups is prepared by a method comprising the following steps: methacryloxypropyl alkoxysilane reacts with alkyl silicate to obtain a siloxane compound with active groups; wherein the methacryloxypropyl alkoxysilane is selected from at least one of γ-methacryloxypropyl trimethoxysilane, γ-methacryloxypropyl triethoxysilane or γ-methacryloxypropyl methyldimethoxysilane; and the alkyl silicate is selected from at least one of methyl orthosilicate and ethyl orthosilicate.

[0031] Specifically, the hollow volume of the core-shell type thermal insulation emulsion is 10-20 times that of traditional glass microspheres, which can effectively reduce the thermal conductivity coefficient.

[0032] Preferably, the liquid material further comprises a defoaming agent and a preservative.

[0033] Preferably, the defoaming agent includes at least one of polysiloxane, polyether-modified dimethylsiloxane, and polymer composite mineral oil; preferably at least one of BASF FoamstarST 2410AG (A10) and BASF Foamaster MO NXZ.

[0034] Preferably, the preservative includes at least one of 5-chloro-2-methylisothiazoline-3-one, 2-methyl-4-isothiazoline-3-one, and 1,2-benzisothiazolin-3-one; preferably at least one of Dow BIOBAN CM 14, Dow BT NV2, and Dow MB 2X.

[0035] Preferably, the dry material includes the following components in parts by mass: 40-60 parts of cement clinker, 20-30 parts of river sand, 10-30 parts of filler, 1-5 parts of redispersible latex powder, 0.1-1 parts of thickener, and 0.1-1 parts of water reducer.

[0036] Preferably, the liquid material comprises the following components in parts by mass: 48-60 parts of water, 40-50 parts of thermal insulation emulsion, 0.1-1 parts of defoaming agent, and 0.1-1 parts of preservative.

[0037] The second aspect of the present invention provides a method for preparing the thermal insulation mortar according to the first aspect of the present invention, comprising the following steps:

[0038] The components of the dry material and the liquid material are stirred and mixed respectively, and then the dry material is mixed with the liquid material to obtain the thermal insulation mortar.

[0039] Preferably, the rotation speed of stirring and mixing the various components of the dry material is 50-70 r / min; further preferably, the rotation speed of stirring and mixing the various components of the dry material is 55-65 r / min.

[0040] Preferably, the time for stirring and mixing the various components of the dry material is 5-15 minutes; more preferably, the time for stirring and mixing the various components of the dry material is 7-12 minutes.

[0041] Preferably, the dry material components are mixed by low-speed stirring using a horizontal double-screw ribbon mixer.

[0042] Preferably, the rotation speed of stirring and mixing the components of the liquid material is 500-1000 r / min; further preferably, the rotation speed of stirring and mixing the components of the liquid material is 500-800 r / min.

[0043] Preferably, the time for stirring and mixing the components of the liquid material is 3-10 minutes; further preferably, the time for stirring and mixing the components of the liquid material is 3-7 minutes.

[0044] Preferably, the components of the liquid material are stirred and mixed using a high-speed disperser.

[0045] Preferably, the time for mixing the dry material and the liquid material is 5-15 minutes; more preferably, the time for mixing the dry material and the liquid material is 7-12 minutes.

[0046] The third aspect of the present invention provides application of the thermal insulation mortar described in the first aspect of the present invention in the field of energy-saving buildings.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] 1) The thermal insulation mortar provided by the present invention has simple components and uses thermal insulation emulsion as a functional thermal insulation raw material, which can make the mortar have a good reflective thermal insulation effect and improve mechanical properties such as tensile bonding strength and compressive strength. The dry material and the liquid material are mixed in a specific proportion to ensure that there is no sand falling during construction, and the construction performance is good;

[0049] 2) The preparation method of the thermal insulation mortar provided by the present invention has simple steps. The dry material components are stirred at a low speed to be quickly and evenly mixed. The liquid material components are dispersed and mixed at a high speed to complete refinement and uniform distribution in a short time. Through step-by-step mixing, dry materials and liquid materials with different properties can be better processed to ensure that they are evenly distributed in the final mixture, thereby improving the quality of the mortar.

[0050] 3) The thermal insulation mortar provided by the present invention has basic properties such as compressive strength that comply with the GB / T 25181-2019 "Premixed Mortar" standard, and the reflective insulation effect complies with the GB / T 25261-2018 "Reflective Insulation Coating for Buildings" standard, and can meet the application requirements in the field of energy-saving buildings. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below by specific examples. Unless otherwise specified, the raw materials, reagents or devices used in the examples and comparative examples can be obtained from conventional commercial sources or can be obtained by prior art methods. Unless otherwise specified, the experiments or test methods are conventional methods in the art.

[0052] The core-shell thermal insulation emulsion used in the following examples and comparative examples was prepared by the following steps:

[0053] S1, first take 100g of ethyl silicate and put it into 50g of deionized water, stir evenly, add 0.01-0.05g of glacial acetic acid during stirring, raise the temperature to 40-50°C, continue stirring for 5min, then drop 10g of γ-methacryloxypropyltriethoxysilane monomer into the water, react for 30min, cool down, add 0.1% (w / v) of tetrahydroxypropylethylenediamine as a stabilizer in the mixed solution, and finally filter to obtain a siloxane compound with an active group;

[0054] S2, dispersing the emulsifier sodium dodecylbenzene sulfonate (DS-4) in deionized water, slowly adding the olefin monomer methyl methacrylate (MMA) and the unsaturated acid methacrylic acid (MAA) into the water under stirring, dispersing at a speed of 600rpm for 10min, preparing the pre-emulsion for dropwise reaction; mixing sodium persulfate and water evenly, and setting aside as a titration initiator; preparing a reaction flask, adding a certain amount of water and heating it to 83-89°C, adding about 2% of the pre-emulsion, and adding a part of the sodium persulfate aqueous solution, keeping the temperature at 83-85°C for 15min, and showing a blue fluorescent state; continuing to dropwisely add the remaining pre-emulsion and the remaining sodium persulfate aqueous solution at 83-85°C for reaction at a uniform speed, stirring at a uniform speed for 4h until the reaction is formed into an emulsion; putting the previously treated silane into the reactor at one time, washing it with water, controlling the temperature to 83-85°C for insulation reaction for 2h, finally cooling it down, filtering the emulsion, and obtaining an acrylic acid seed emulsion;

[0055] S3, adding the acrylic seed emulsion into water, raising the temperature to 90-93°C, adding sodium persulfate, dripping an emulsion consisting of sodium dodecylbenzene sulfonate (DS-4), styrene (ST), methyl methacrylate (MMA), allyl methacrylate (AMA), methacrylic acid (MAA) and water, and sodium persulfate, the dripping time is 150min, adding ammonia water when dripping 45% emulsion, reacting for 5min, and continuing dripping; cooling to 80-83°C after the dripping reaction, post-treating reaction with tert-butyl hydroperoxide and ascorbic acid, and keeping warm for 20min; cooling to below 50°C and discharging to obtain a core-shell type thermal insulation acrylic emulsion.

[0056] The particle size of the core-shell thermal insulation acrylic emulsion is 1700nm, the inner core particle size is 550nm, the solid content is 40wt%, and in the hollow structure, γ-methacryloxypropyltrimethoxysilane is used as a support structure to ensure the stability of the core-shell structure.

[0057] Example 1

[0058] This embodiment provides a thermal insulation mortar, and the raw materials for preparation are shown in Table 1:

[0059] Table 1 Raw materials for preparing thermal insulation mortar in Example 1

[0060]

[0061] The thermal insulation mortar is prepared by the following steps:

[0062] 1) Add cement clinker, river sand, filler, thickener, redispersible latex powder and water reducing agent into a horizontal double-screw ribbon mixer at a speed of 60 r / min and mix for 10 min to obtain dry material;

[0063] 2) Add water and thermal insulation emulsion into the dispersion tank of a high-speed disperser, start the stirring speed at 700r / min, add defoamer and preservative in sequence, stir evenly for 5 minutes, and obtain a liquid material;

[0064] 3) Add the dry material and liquid material into the dispersion tank at a mass ratio of 2.4:1, stir for 10 minutes, and obtain the thermal insulation mortar.

[0065] Example 2

[0066] This embodiment provides a thermal insulation mortar, and the raw materials for preparation are shown in Table 2:

[0067] Table 2 Raw materials for preparing thermal insulation mortar in Example 2

[0068]

[0069] The thermal insulation mortar is prepared by the following steps:

[0070] 1) Add cement clinker, river sand, filler, thickener, redispersible latex powder and water reducing agent into a horizontal double-screw ribbon mixer at a speed of 60 r / min and mix for 10 min to obtain dry material;

[0071] 2) Add water and thermal insulation emulsion into the dispersion tank of a high-speed disperser, start the stirring speed at 700r / min, add defoamer and preservative in sequence, stir evenly for 5 minutes, and obtain a liquid material;

[0072] 3) Add the dry material and liquid material into the dispersion tank at a mass ratio of 2.4:1, stir for 10 minutes, and obtain the thermal insulation mortar.

[0073] Example 3

[0074] This embodiment provides a thermal insulation mortar, and the raw materials for preparation are shown in Table 3:

[0075] Table 3 Raw materials for preparing thermal insulation mortar in Example 3

[0076]

[0077]

[0078] The thermal insulation mortar is prepared by the following steps:

[0079] 1) Add cement clinker, river sand, filler, thickener, redispersible latex powder and water reducing agent into a horizontal double-screw ribbon mixer at a speed of 60 r / min and mix for 10 min to obtain dry material;

[0080] 2) Add water and thermal insulation emulsion into the dispersion tank of a high-speed disperser, start the stirring speed at 700r / min, add defoamer and preservative in sequence, stir evenly for 5 minutes, and obtain a liquid material;

[0081] 3) Add the dry material and liquid material into the dispersion tank at a mass ratio of 2.2:1, stir for 10 minutes, and obtain the thermal insulation mortar.

[0082] Example 4

[0083] This embodiment provides a thermal insulation mortar, and the raw materials for preparation are shown in Table 4:

[0084] Table 4 Raw materials for preparing thermal insulation mortar in Example 4

[0085]

[0086] The thermal insulation mortar is prepared by the following steps:

[0087] 1) Add cement clinker, river sand, filler, thickener, redispersible latex powder and water reducing agent into a horizontal double-screw ribbon mixer at a speed of 60 r / min and mix for 10 min to obtain dry material;

[0088] 2) Add water and thermal insulation emulsion into the dispersion tank of a high-speed disperser, start the stirring speed at 700r / min, add defoamer and preservative in sequence, stir evenly for 5 minutes, and obtain a liquid material;

[0089] 3) Add the dry material and liquid material into the dispersion tank at a mass ratio of 2.2:1, stir for 10 minutes, and obtain the thermal insulation mortar.

[0090] Example 5

[0091] This embodiment provides a thermal insulation mortar, and the raw materials for preparation are shown in Table 5:

[0092] Table 5 Raw materials for preparing thermal insulation mortar in Example 5

[0093]

[0094] The thermal insulation mortar is prepared by the following steps:

[0095] 1) Add cement clinker, river sand, filler, thickener, redispersible latex powder and water reducing agent into a horizontal double-screw ribbon mixer at a speed of 60 r / min and mix for 10 min to obtain dry material;

[0096] 2) Add water and thermal insulation emulsion into the dispersion tank of a high-speed disperser, start the stirring speed at 700r / min, add defoamer and preservative in sequence, stir evenly for 5 minutes, and obtain a liquid material;

[0097] 3) Add the dry material and liquid material into the dispersion tank in a mass ratio of 2:1, stir for 10 minutes, and obtain the thermal insulation mortar.

[0098] Example 6

[0099] This embodiment provides a thermal insulation mortar, and the raw materials for preparation are shown in Table 6:

[0100] Table 6 Raw materials for preparing thermal insulation mortar in Example 6

[0101]

[0102]

[0103] The thermal insulation mortar is prepared by the following steps:

[0104] 1) Add cement clinker, river sand, filler, thickener, redispersible latex powder and water reducing agent into a horizontal double-screw ribbon mixer at a speed of 60 r / min and mix for 10 min to obtain dry material;

[0105] 2) Add water and thermal insulation emulsion into the dispersion tank of a high-speed disperser, start the stirring speed at 700r / min, add defoamer and preservative in sequence, stir evenly for 5 minutes, and obtain a liquid material;

[0106] 3) Add the dry material and liquid material into the dispersion tank in a mass ratio of 2:1, stir for 10 minutes, and obtain the thermal insulation mortar.

[0107] Comparative Example 1

[0108] This comparative example provides a thermal insulation mortar, and the raw materials for preparation are shown in Table 7:

[0109] Table 7 Raw materials for preparing thermal insulation mortar in comparative example 1

[0110]

[0111] The thermal insulation mortar is prepared by the following steps:

[0112] 1) Add cement clinker, river sand, filler, thickener, redispersible latex powder and water reducing agent into a horizontal double-screw ribbon mixer at a speed of 60 r / min and mix for 10 min to obtain dry material;

[0113] 2) Add water and ordinary silicone-acrylic emulsion into the dispersion tank of a high-speed disperser, start the stirring speed at 700 r / min, add defoamer and preservative in sequence, stir evenly for 5 minutes, and obtain a liquid material;

[0114] 3) Add the dry material and liquid material into the dispersion tank at a mass ratio of 2.4:1, stir for 10 minutes, and obtain the thermal insulation mortar.

[0115] Comparative Example 2

[0116] This comparative example provides a thermal insulation mortar, and the raw materials for preparation are shown in Table 8:

[0117] Table 8 Raw materials for preparing thermal insulation mortar in comparative example 2

[0118]

[0119] The thermal insulation mortar is prepared by the following steps:

[0120] 1) Add cement clinker, river sand, glass beads, filler, thickener, redispersible latex powder and water reducing agent into a horizontal double-screw ribbon mixer at a speed of 60 r / min and mix for 10 min to obtain dry material;

[0121] 2) Add water and ordinary silicone-acrylic emulsion into the dispersion tank of a high-speed disperser, start the stirring speed at 700 r / min, add defoamer and preservative in sequence, stir evenly for 5 minutes, and obtain a liquid material;

[0122] 3) Add the dry material and liquid material into the dispersion tank at a mass ratio of 2.4:1, stir for 10 minutes, and obtain the thermal insulation mortar.

[0123] Comparative Example 3

[0124] This comparative example provides a thermal insulation mortar, and the raw materials for preparation are shown in Table 9:

[0125] Table 9 Raw materials for preparing thermal insulation mortar in comparative example 3

[0126]

[0127] The thermal insulation mortar is prepared by the following steps:

[0128] 1) Add cement clinker, river sand, filler, thickener, redispersible latex powder and water reducing agent into a horizontal double-screw ribbon mixer at a speed of 60 r / min and mix for 10 min to obtain dry material;

[0129] 2) Add water and thermal insulation emulsion into the dispersion tank of a high-speed disperser, start the stirring speed at 700r / min, add defoamer and preservative in sequence, stir evenly for 5 minutes, and obtain a liquid material;

[0130] 3) Add the dry material and liquid material into the dispersion tank in a mass ratio of 3:1, stir for 10 minutes, and obtain the thermal insulation mortar.

[0131] Performance Testing

[0132] The basic properties and reflective insulation effects of the thermal insulation mortars in Examples 1-6 and Comparative Examples 1-3 were tested, wherein the test methods and evaluation standards refer to GB / T 25181-2019 "Premixed Mortar", GB / T 20473-2021 "Building Thermal Insulation Mortar", JG / T 157-2009 "Putty for Building Exterior Walls", GB / T 25261-2018 "Reflective Insulation Coating for Buildings" and JC / T984-2011 "Polymer Cement Waterproof Mortar". The reference standards and limits for the thermal insulation mortar test items are shown in Table 10 below, the test results of the basic properties and reflective insulation effects of the thermal insulation mortars in Examples 1-6 are shown in Table 11, and the test results of the basic properties and reflective insulation effects of the thermal insulation mortars in Comparative Examples 1-3 are shown in Table 12:

[0133] Table 10 Reference standards and limits for thermal insulation mortar test items

[0134]

[0135]

[0136] Table 11 Basic properties of thermal insulation mortar and test results of reflective insulation effect in Examples 1-6

[0137] Test items Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 2h consistency loss rate / % 5.2 4.7 5.5 5.0 6.2 5.8 28d compressive strength / MPa 16.3 13.6 15.9 15.4 16.2 15.7 Softening coefficient 0.85 0.91 0.88 0.84 0.90 0.82 14d tensile bond strength / MPa 1.76 1.57 1.84 1.77 1.63 1.69 28d shrinkage / % 0.13 0.14 0.18 0.17 0.15 0.16 Thermal conductivity / [W / (m·K)] 0.80 0.76 0.72 0.74 0.71 0.77 Solar reflectance 0.42 0.40 0.51 0.54 0.49 0.56 Near infrared reflectance 0.57 0.65 0.66 0.60 0.59 0.69 Hemispherical emissivity 0.92 0.91 0.91 0.94 0.88 0.93 Construction No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality Initial drying crack resistance No cracks No cracks No cracks No cracks No cracks No cracks Water absorption / % 2.45 2.13 2.65 2.07 2.11 2.51

[0138] Table 12 Basic performance and reflective insulation effect test results of thermal insulation mortar in comparative examples 1-3

[0139] Test items Comparative Example 1 Comparative Example 2 Comparative Example 3 2h consistency loss rate / % 5.4 15.4 10.6 28d compressive strength / MPa 15.5 3.7 17.3 Softening coefficient 0.80 0.69 0.92 14d tensile bond strength / MPa 1.53 0.61 1.14 28d shrinkage / % 0.15 0.10 0.12 Thermal conductivity / [W / (m·K)] 1.24 0.88 0.76 Solar reflectance 0.21 0.39 0.47 Near infrared reflectance 0.37 0.52 0.55 Hemispherical emissivity 0.86 0.89 0.89 Construction No abnormality Sand Drop Difficult construction Initial drying crack resistance No cracks Cracking No cracks Water absorption / % 2.63 8.74 2.37

[0140] Table 11 shows the basic performance and reflective insulation effect test results of the thermal insulation mortar in Examples 1-6, and Table 12 shows the basic performance and reflective insulation effect test results of the thermal insulation mortar in Comparative Examples 1-3. Combining the test results in Table 11 and Table 12, it can be seen that:

[0141] In Examples 1-6, the solar reflectance of the mortar is greater than or equal to 0.40, the near-infrared reflectance is greater than or equal to 0.57, the hemispherical emissivity is greater than or equal to 0.88, and the thermal conductivity is less than or equal to 0.81 W / (m·K), all of which meet the performance requirements of reflective thermal insulation coatings for buildings, and the reflective thermal insulation effect is good. In Examples 1-6, the core-shell thermal insulation acrylic emulsion is used as the functional thermal insulation raw material, which can provide a good reflective thermal insulation effect.

[0142] Compared with Example 1, the solar reflectance, near-infrared reflectance and hemispherical emissivity of the mortar in Example 1 are much lower than those in Example 1, and the thermal conductivity is 1.24W / (m·K), which is much higher than that in Example 1. The solar reflectance and near-infrared reflectance do not meet the requirements of reflective thermal insulation coatings for construction, and the mortar does not have a reflective thermal insulation effect. The reason is that Example 1 does not use a core-shell structured thermal insulation emulsion. Because ordinary silicone acrylic emulsion does not have a core-shell structure, it cannot provide a hollow volume to reduce the thermal conductivity coefficient and cannot be used as a functional thermal insulation raw material.

[0143] Compared with Example 2, the solar reflectance, near-infrared reflectance and hemispherical emissivity of the mortar in Example 1 all meet the requirements of reflective heat-insulating coatings for buildings, but are lower than Example 1. The thermal conductivity is 0.88W / (m·K), which is higher than Example 1. The mortar has a reflective heat-insulating effect but is not as good as Example 1. The difference between Example 2 and Example 1 is that the traditional functional heat-insulating filler glass microbeads are used. It can be seen that the core-shell structured heat-insulating emulsion has a larger hollow volume than glass microbeads, can provide better reflective heat-insulating effect, and can completely replace glass microbeads. In addition, there is no sand drop during the construction of the mortar in Example 1, and the 28d compressive strength and 14d tensile bond strength are 16.3MPa and 1.76MPa, respectively, which are much higher than Comparative Example 2 (3.7MPa and 0.61MPa), indicating that the core-shell structured heat-insulating emulsion is used as a functional heat-insulating filler, which is beneficial to improving the mechanical properties and construction performance of the mortar. At the same time, there is no abnormality in the initial drying cracking of Example 1, and the water absorption rate is only 2.45%, while the initial drying cracking of Comparative Example 2 fails, and the water absorption rate is as high as 8.74%, indicating that the thermal insulation mortar prepared with the core-shell structure thermal insulation emulsion has significantly improved crack resistance and water absorption rate than the traditional thermal insulation mortar with glass beads as thermal insulation fillers.

[0144] The difference between Example 5 and Comparative Example 3 is that the mass ratio of dry material to liquid material is different. The mortar in Comparative Example 3 has reflective heat insulation function, but the construction is difficult and the construction performance is poor. Therefore, the mass ratio of dry material to liquid material needs to be kept within a reasonable range.

[0145] The thermal insulation mortar provided by the present invention has good reflective insulation effect, high tensile bonding strength and compressive strength, improved crack resistance and water absorption rate, good construction performance, does not contain flammable components such as foamed polystyrene, has good safety performance, and the preparation method of the mortar is simple, which can meet the application requirements in the field of energy-saving buildings.

Claims

1. A thermal insulation mortar, characterized in that: Includes dry and liquid materials; The dry materials include the following components: cement clinker, river sand, filler, and redispersible latex powder; The liquid material comprises the following components: water, thermal insulation emulsion; The mass ratio of the dry material to the liquid material is (2.0-2.6):

1.

2. The thermal insulation mortar according to claim 1, characterized in that: The particle size of the river sand is 70-140 mesh; the particle size of the filler is 200-300 mesh; Preferably, the filler includes at least one of fly ash, quartz powder and double fly ash.

3. The thermal insulation mortar according to claim 1, characterized in that: The dry material also includes a thickener and a water reducing agent; Preferably, the thickener comprises hydroxypropyl methylcellulose ether.

4. The thermal insulation mortar according to claim 1, characterized in that: The thermal insulation emulsion is a core-shell emulsion; Preferably, the particle size of the core-shell emulsion is 1000-2000 nm, and the core particle size is 300-600 nm; Preferably, the solid content of the core-shell emulsion is 40-55wt%; Preferably, the thermal insulation emulsion includes core-shell silicone-acrylic emulsion and core-shell acrylic emulsion.

5. The thermal insulation mortar according to claim 1, characterized in that: The liquid material also includes a defoamer and a preservative.

6. The thermal insulation mortar according to claim 3, characterized in that: The dry material includes the following components by weight: 40-60 parts of cement clinker, 20-30 parts of river sand, 10-30 parts of filler, 1-5 parts of redispersible latex powder, 0.1-1 parts of thickener, and 0.1-1 parts of water reducer.

7. The thermal insulation mortar according to claim 5, characterized in that: The liquid material comprises the following components by weight: 48-60 parts of water, 40-50 parts of thermal insulation emulsion, 0.1-1 parts of defoaming agent, and 0.1-1 parts of preservative.

8. The method for preparing the thermal insulation mortar according to any one of claims 1 to 7, characterized in that: The following steps are involved: The components of the dry material and the liquid material are stirred and mixed respectively, and then the dry material is mixed with the liquid material to obtain the thermal insulation mortar.

9. The preparation method according to claim 8, characterized in that: The speed of stirring and mixing the components of the dry material is 50-70r / min, and the time is 5-15min; And / or, the liquid material components are stirred and mixed at a speed of 500-1000 r / min for 3-10 min; And / or, the time for mixing the dry material and the liquid material is 5-15 minutes.

10. Application of the thermal insulation mortar according to any one of claims 1 to 7 in the field of energy-saving buildings.

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