Outdoor wall cement mortar and preparation method thereof

Abstract

The invention discloses outdoor wall cement mortar and a preparation method thereof. The cement mortar is prepared from 200 to 400 parts of a cementing material, 500 to 800 parts of sand, 20 to 50 parts of water-soluble acrylic resin, 80 to 150 parts of jade powder, 300 to 600 parts of a modified perlite thermal insulation material, 2 to 5 parts of a water reducing agent and 500 to 800 parts of water. Wherein the cementing material is obtained by mixing cement and waterborne polyurethane; the modified perlite thermal insulation material is obtained by reacting expanded perlite with a silane coupling agent under the action of an organic tin additive. The gel material disclosed by the invention is obtained by mixing cement and waterborne polyurethane, so that the compressive and abrasive strength of a mortar layer and the interface bonding force between mortar and a brick wall surface are improved; meanwhile, a modified perlite thermal insulation material is introduced into the mortar, so that the flowability and the thermal insulation property of the mortar are improved, and the saltpetering condition is inhibited.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and particularly relates to an outdoor wall cement mortar and a preparation method thereof. Background Art

[0002] Mortar is an adhesive substance used for bricklaying in construction. It is made by mixing a certain proportion of sand and binder materials (such as cement, lime paste, clay, etc.) with water. Commonly used mortars include cement mortar, mixed mortar (or cement-lime mortar), lime mortar, and clay mortar. Cement mortar is made from cement, sand, and water in a certain ratio and is generally used for masonry, walls, or floors in humid environments or water. Mixed mortar is made by adding appropriate admixtures such as fly ash and diatomite to cement or lime mortar to save cement or lime consumption and improve the workability of the mortar. Commonly used mixed mortars include cement-lime mortar, cement-clay mortar, and lime-clay mortar, etc. Lime mortar is made from lime paste, sand, and water in a certain ratio and is generally used for masonry and plastering layers with low strength requirements and not affected by moisture. In building plastering works, mortar not only plays a decorative role but also has a waterproof effect. However, in the actual application of wall mortar, a series of problems such as poor waterproof performance, cracking, and peeling may occur.

[0003] Cement bricks are a new type of wall material made by using fly ash, coal cinder, coal gangue, tailings slag, chemical slag, or natural sand, coastal mud, etc. as the main raw materials, with cement as the coagulant, without high-temperature calcination. Due to the high strength of cement bricks, no need for firing, low cost, fast production speed, good load-bearing and seismic performance, heat insulation, sound insulation, good water resistance, strong decorative properties, corrosion resistance, pollution-free, etc., they have gradually replaced the application of traditional red bricks in construction. However, compared with traditional red bricks, cement bricks do not bond firmly with plastering cement mortar, are prone to cracks on the wall, affecting the appearance. At the same time, the hydration problem of cement mortar is serious. Therefore, it is of great significance to develop a cement mortar that has an excellent effect on the interfacial bonding force with cement bricks and has no hydration hidden danger.

[0004] There are already some patent documents providing cement mortar materials with good performance. The invention patent with the publication number CN111362633A discloses a technical solution of a heat-insulating and alkali-resistant wall cement mortar. The wall cement mortar is composed of cement, latex powder, polyacrylonitrile fiber, peroxydiphosphate and heat-insulating and heat-preserving materials. By using ceramsite with a lower thermal conductivity instead of sand with a higher thermal conductivity as the heat-insulating and heat-preserving material, the heat-preserving performance of the wall is improved. The ceramsite is coated with zirconia and / or fly ash to solve the problem that the ceramsite floats upward due to its light weight during the mixing process. However, the ceramsite used has a relatively large particle size, which may reduce the flatness of the wall when plastered on the wall, and at the same time, wall hollowing may occur. Due to the thermal expansion and contraction properties of cement during long-term use, cracks are likely to occur due to seasonal changes. The invention patent with the publication number CN111268972A discloses an environmentally friendly color-tuned wall cement mortar and its preparation method. 100 - 120 kg of jade powder, 20 - 30 kg of water-soluble enhanced PMMA microspheres, 5 - 12 kg of microcrystalline cellulose, 25 - 100 kg of waterborne polyurethane and 1 - 3 kg of water reducer are added to every 1 cubic meter of cement. The water-soluble enhanced PMMA microspheres are obtained by cross-linking methyl methacrylate and then coupling with carbon fiber and basalt fiber, which improves the crack resistance, impermeability and impact resistance of the mortar. If this wall cement mortar is plastered on the surface of cement bricks, peeling will occur due to the weak interfacial bonding ability with the cement bricks. The invention patent with the publication number CN106277954A discloses an indoor wall cement mortar, its preparation method and a board prepared with this mortar as the raw material. The main raw materials of the cement mortar are 1 cubic meter of cement, 2 cubic meters of sand, 200 kg of jade powder, plus 2 - 6 kg of polyvinyl chloride, 3 - 5 kg of dimethyltin oxide, 10 - 20 kg of sodium carboxymethyl cellulose and 10 - 20 kg of polyamide. The board prepared with this mortar has good heat-insulating and heat-preserving effects, is not easy to burn, crack, peel, is waterproof, durable and has a long service life. However, the heat-insulating and heat-preserving effect of this cement mortar is not good, and it cannot solve the hydration problem that occurs during long-term use of the mortar.

[0005] Therefore, it is still necessary to provide a cement mortar with good heat-preserving performance and strong bonding force with the wall. Summary of the Invention

[0006] In view of the problems existing in the prior art that the cement mortar has poor heat-insulating and heat-preserving effects, weak bonding ability and low durability, the present invention mixes cement and water-soluble polyurethane as gelling materials and introduces a modified perlite heat-insulating material to construct a cement mortar with strong interfacial bonding force with cement bricks and good heat-insulating and heat-preserving performance.

[0007] To achieve the above object, the present invention provides an outdoor wall cement mortar, which comprises the following raw materials in parts by mass,

[0008] 200 - 400 parts of cementitious materials, 500 - 800 parts of sand, 20 - 50 parts of water-soluble acrylic resin, 80 - 150 parts of jade powder, 300 - 600 parts of modified perlite thermal insulation material, 2 - 5 parts of water reducer, 500 - 800 parts of water;

[0009] Among them, the cementitious materials are obtained by mixing cement and waterborne polyurethane;

[0010] The modified perlite thermal insulation material is obtained by reacting expanded perlite with a silane coupling agent under the action of an organotin additive.

[0011] Further, the preparation method of the modified perlite thermal insulation material includes, in parts by mass,

[0012] Mix 100 - 200 parts of water, 100 - 200 parts of ammonia water, and 800 - 1000 parts of methanol evenly to obtain a mixed solution;

[0013] Mix 300 - 500 parts of tetraethyl orthosilicate and 800 - 1000 parts of methanol to obtain a functional solution;

[0014] Add the mixed solution to the functional solution, then add 300 - 500 parts of expanded perlite, and stir at a speed of 300 - 500 rpm for 12 - 48 h to obtain a mixture;

[0015] Add 100 - 120 parts of hydrochloric acid and 2500 - 4000 parts of methanol to the mixture, stir at a speed of 300 - 500 rpm for 30 - 60 min, let it stand for 36 - 72 h, then add 2 - 5 parts of dibutyltin dilaurate, and stir at a speed of 300 - 500 rpm for 36 - 72 h to obtain the modified perlite thermal insulation material.

[0016] Further, the preparation method of the modified perlite thermal insulation material includes, in parts by mass,

[0017] Mix 100 - 200 parts of water, 100 - 200 parts of ammonia water, and 800 - 1000 parts of methanol evenly to obtain a mixed solution, then add 300 - 500 parts of expanded perlite and 800 - 1000 parts of methanol, and stir at a speed of 300 - 500 rpm for 12 - 48 h to obtain a mixture;

[0018] Add 100 - 120 parts of hydrochloric acid and 2500 - 4000 parts of methanol to the said mixture, stir at a speed of 300 - 500 rpm / min for 30 - 60 min, then keep stirring and add 300 - 500 parts of chloropropyltriethoxysilane dropwise at a dropping rate of 1 - 3 mL / s. After the dropping is completed, let it stand for 36 - 72 h, then add 2 - 5 parts of dibutyltin dilaurate, and stir at a speed of 300 - 500 rpm / min for 36 - 72 h to obtain the modified perlite thermal insulation material.

[0019] Furthermore, the preparation method of the modified perlite thermal insulation material includes, by mass parts,

[0020] Mix 100 - 200 parts of water, 100 - 200 parts of ammonia water, and 800 - 1000 parts of methanol evenly to obtain a mixed solution;

[0021] Mix 300 - 500 parts of tetraethyl orthosilicate and 800 - 1000 parts of methanol to obtain a functional solution;

[0022] Add the mixed solution to the functional solution, then add 300 - 500 parts of expanded perlite, and stir at a speed of 300 - 500 rpm / min for 12 - 48 h to obtain a mixture;

[0023] Add 100 - 120 parts of hydrochloric acid and 2500 - 4000 parts of methanol to the said mixture, stir at a speed of 300 - 500 rpm / min for 30 - 60 min, then keep stirring and add 300 - 500 parts of chloropropyltriethoxysilane dropwise at a dropping rate of 1 - 3 mL / s. After the dropping is completed, let it stand for 36 - 72 h, then add 2 - 5 parts of dibutyltin dilaurate, and stir at a speed of 300 - 500 rpm / min for 36 - 72 h to obtain the modified perlite thermal insulation material.

[0024] Furthermore, the mass ratio of cement to waterborne polyurethane in the gelling material is 3 - 6:1 - 2.

[0025] Furthermore, the expanded perlite is obtained by calcining perlite at 1000 - 1300 °C for 1 - 3 h.

[0026] Furthermore, the particle size of the expanded perlite is 200 - 300 mesh.

[0027] In the present invention, the types of water - reducing agents do not need to be strictly limited, and those needed can be selected by oneself.

[0028] The present invention also provides the preparation method of the above - mentioned outdoor wall cement mortar, including,

[0029] Mix and stir the water - reducing agent, part of the water, and the modified perlite thermal insulation material to obtain a mixed material;

[0030] Mix the gelling material, water-soluble acrylic resin, jade powder, remaining water, sand, and the mixture, stir them, let it stand still after stirring is completed, and then stir again to obtain cement mortar.

[0031] Further, the stirring rate is 50 - 100 rpm / min.

[0032] Further, the standing is carried out at 40 - 60 °C for 1 - 3 h.

[0033] The cement mortar for outdoor wall not only strengthens the wall surface and improves the waterproof ability of the wall surface on the exterior wall of the building, but also plays a positive role in indoor heat preservation and insulation. The outdoor cement mortar of the present invention mixes cement and water-soluble polyurethane in proportion, while improving the compressive and wear-resistant strength of the mortar layer, enhancing the adhesion of the mortar itself and the interfacial bonding force between the mortar and the brick substrate. Expanded perlite has a high water absorption rate. Expandable perlite is modified with tetraethyl orthosilicate and chloropropyltriethoxysilane to generate silica and cage-shaped polyhedral oligomeric silsesquioxane. Silica is loaded on the surface and internal pores of expanded perlite, improving the fluidity and flame retardancy of the mortar, enhancing the hardness of expanded perlite, and effectively alleviating the "efflorescence" situation where alkaline substances precipitate in the cement mortar wall surface from the wall substrate. Silica reacts with calcium hydroxide precipitated from the wall surface to form calcium silicate and water, and the water is absorbed and stored by expanded perlite for the maintenance of cement in the mortar. Calcium silicate has a low thermal conductivity and good heat preservation effect; cage-shaped polyhedral oligomeric silsesquioxane forms a hydrophobic film on the surface of expanded perlite, reducing the water absorption of expanded perlite and minimizing the influence of expanded perlite on reducing the fluidity of the mortar in the mortar, enhancing the compressive strength and waterproof performance of the cement mortar. Expanded perlite has many internal pores, and silica is loaded inside expanded perlite, filling the internal pores of expanded perlite and enhancing the mechanical strength and heat preservation effect of expanded perlite. Cage-shaped polyhedral oligomeric silsesquioxane is an inorganic core composed of a silicon-oxygen bond-interconnected silicon-oxygen skeleton, showing a "cage" structure. Silica is a tetrahedral space network structure formed by silicon-oxygen bonding, with hydroxyl groups on the surface. During the synthesis of cage-shaped polyhedral oligomeric silsesquioxane, the ethoxy groups in chloropropyltriethoxysilane are hydrolyzed and connected to the surface of silica and expanded perlite to form silicon-oxygen bonds, improving the hardness of the modified perlite thermal insulation material and enhancing the wear resistance of the mortar.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) Mixing cement and polyurethane improves the compressive and wear-resistant strength of the mortar layer and the interfacial bonding force between the mortar and the brick wall surface.

[0036] (2) Introducing the modified perlite thermal insulation material into the mortar improves the fluidity and heat preservation and insulation properties of the mortar while suppressing the occurrence of efflorescence. Specific embodiments

[0037] In the ranges disclosed in the present invention, the endpoints and any values are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in the present invention.

[0038] Introduction to some raw materials used in the embodiments of the present invention:

[0039] Cement: Shanxi Tuoda Building Materials Co., Ltd., main component: silicate, strength grade: 42.5, factory standard: P.O32.5.

[0040] Perlite: Lingshou Qianfu Mineral Products Processing Factory, product number: 019, particle size: 1 - 3 mesh.

[0041] Water-soluble polyurethane: Nantong Yuru Engineering Materials Co., Ltd., product number: YR2020090901.

[0042] Water-based acrylic resin: Guangzhou Wanhua New Materials Technology Co., Ltd., model: WA228, viscosity: 5000 - 10000 cps.

[0043] Jade powder: Lingshou Yanhui Mineral Products Trading Co., Ltd., product number: ty-568, particle size: 4000 mesh.

[0044] Sand: Zhenhe Mineral Products Processing Factory, particle size: 0.5 - 0.8 mm, bulk density: 1570 kg / m3.

[0045] Dibutyltin dilaurate: Wuhan Karnos Technology Co., Ltd., CAS number: 77-58-7.

[0046] Other raw materials not mentioned are common raw materials in the art. The above content is only for helping to illustrate the present invention and should not be construed as a strict limitation of the present invention. Those skilled in the art can directly purchase from the market or prepare the same / similar raw materials by themselves.

[0047] Next, specific embodiments of the present invention will be combined to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0048] Example 1

[0049] A preparation method of outdoor wall cement mortar, comprising the following steps:

[0050] Step 1: Add 30 g of calcium lignosulfonate to 1500 g of water, stir at 100 rpm / min for 20 min, then add 4500 g of modified perlite thermal insulation material, and continue to stir for 45 min to obtain a mixed material;

[0051] Step 2: Mix 2400 g of cement, 600 g of water-soluble polyurethane, 350 g of waterborne acrylic resin, 1000 g of jade powder, and 5370 g of water, stir at 50 rpm / min for 20 min, then add 6000 g of sand and 6000 g of the mixed material prepared in Step 1, and continue to stir at 50 rpm / min for 20 min. After stirring is completed, let it stand at 50 °C for 2 h, and then stir at 50 rpm / min for 15 min to obtain outdoor wall cement mortar.

[0052] The preparation method of the modified perlite thermal insulation material in Step 1 is as follows:

[0053] S1: Roast 1500 g of perlite at 1100 °C for 2 h, ball mill at 450 rpm / min for 60 min, and pass through a 200-mesh sieve to obtain expanded perlite;

[0054] S2: Mix 160 g of water, 150 g of ammonia water, and 920 g of methanol evenly to obtain a mixed solution; mix 400 g of tetraethyl orthosilicate and 920 g of methanol evenly to obtain a functional solution; add the mixed solution to the functional solution, then add 350 g of the expanded perlite prepared in Step S1, and stir at 50 °C and 400 rpm / min for 25 h to obtain a mixture; add the mixture to 105 g of hydrochloric acid with a mass fraction of 37%, then add 3000 g of methanol, stir at 400 rpm / min for 45 min, then dropwise add 350 g of chloropropyltriethoxysilane at 2 mL / second, and let it stand for 48 h; add 3 g of dibutyltin dilaurate, stir at 400 rpm / min for 48 h, filter, collect the solid, wash it with methanol 3 times, and vacuum dry at 70 °C for 4 days to obtain the modified perlite thermal insulation material.

[0055] Example 2

[0056] A preparation method of outdoor wall cement mortar is basically the same as that of Example 1, and the only difference is that the preparation method of the modified perlite thermal insulation material in Step 1 is different.

[0057] The modified perlite thermal insulation material in Step 1, its preparation method is as follows:

[0058] S1. Roast 1500 g of perlite at 1100 °C for 2 h, ball mill it at 450 rpm / min for 60 min, and pass through a 200-mesh sieve to obtain expanded perlite;

[0059] S2. Mix 160 g of water, 150 g of ammonia water, and 920 g of methanol evenly to obtain a mixed solution; mix 400 g of tetraethyl orthosilicate and 920 g of methanol evenly to obtain a functional solution; add the mixed solution to the functional solution, then add 350 g of the expanded perlite prepared in step S1, and stir at 50 °C and 400 rpm / min for 25 h to obtain a mixture; add the mixture to 105 g of a hydrochloric acid solution with a mass fraction of 37%, then add 3000 g of methanol, stir at 400 rpm / min for 45 min, and let it stand for 48 h; add 3 g of dibutyltin dilaurate, stir at 400 rpm / min for 48 h, filter, collect the solid, wash it with methanol 3 times, and dry it in vacuum at 70 °C for 4 days to obtain the modified perlite thermal insulation material.

[0060] Example 3

[0061] A preparation method of outdoor wall cement mortar is basically the same as that of Example 1, and the only difference is that the preparation method of the modified perlite thermal insulation material in step 1 is different.

[0062] The preparation method of the modified perlite thermal insulation material in step 1 is as follows:

[0063] S1. Roast 1500 g of perlite at 1100 °C for 2 h, ball mill it at 450 rpm / min for 60 min, and pass through a 200-mesh sieve to obtain expanded perlite;

[0064] S2. Mix 160 g of water, 150 g of ammonia water, and 920 g of methanol evenly to obtain a mixed solution; add the mixed solution to 920 g of methanol, then add 350 g of the expanded perlite prepared in step S1, and stir at 50 °C and 400 rpm / min for 25 h to obtain a mixture; add the mixture to 105 g of a hydrochloric acid solution with a mass fraction of 37%, then add 3000 g of methanol, stir at 400 rpm / min for 45 min, then dropwise add 350 g of chloropropyltriethoxysilane at 2 mL / s, and let it stand for 48 h; add 3 g of dibutyltin dilaurate, stir at 400 rpm / min for 48 h, filter, collect the solid, wash it with methanol 3 times, and dry it in vacuum at 70 °C for 4 days to obtain the modified perlite thermal insulation material.

[0065] Comparative Example 1

[0066] A preparation method of outdoor wall cement mortar is basically the same as that of Example 1, and the only difference is that the preparation method of the modified perlite thermal insulation material in step 1 is different.

[0067] The modified perlite thermal insulation material in Step 1 is prepared as follows:

[0068] S1. Roast 1500 g of perlite at 1100 °C for 2 h, ball mill it at 450 rpm / min for 60 min, and pass it through a 200-mesh sieve to obtain expanded perlite;

[0069] S2. Mix 160 g of water, 150 g of ammonia water, and 920 g of methanol evenly to obtain a mixed solution; add the mixed solution to 920 g of methanol, then add 350 g of the expanded perlite prepared in Step S1, stir at 50 °C and 400 rpm / min for 25 h to obtain a mixture; add the mixture to 105 g of a hydrochloric acid solution with a mass fraction of 37%, then add 3000 g of methanol, stir at 400 rpm / min for 45 min, and let it stand for 48 h; add 3 g of dibutyltin dilaurate, stir at 400 rpm / min for 48 h, filter, collect the solid, wash it 3 times with methanol, and dry it in vacuum at 70 °C for 4 days to obtain the modified perlite thermal insulation material.

[0070] Comparative Example 2

[0071] A preparation method of outdoor wall cement mortar is basically the same as that of Example 1, and the only difference is that expanded perlite is used to replace the modified perlite thermal insulation material, and the preparation method of the expanded perlite is the same as that of Example 1.

[0072] Test Example

[0073] Thermal conductivity test:

[0074] Mix the mortar according to Appendix B in the National Standard of the People's Republic of China GB / T20473-2006 "Building Thermal Insulation Mortar" to obtain a mixture, and then prepare specimens by casting the mixture according to Appendix C. The mold size is 250 mm × 250 mm × 25 mm. After the specimens are cast, cover them with a polyethylene film, demold them after standing at 25 ± 5 °C for 48 ± 4 h, and cure them for 28 days at 20 ± 3 °C and a relative humidity of 60-80% to obtain test specimen samples. Then, test the thermal conductivity of the mortar samples according to the National Standard of the People's Republic of China GB / T10294-2008 "Determination of Steady-State Thermal Resistance and Related Characteristics of Thermal Insulation Materials - Guarded Hot Plate Method". Place the test specimens in an oven, heat them up to 105 ± 5 °C, dry them to a constant weight, transfer them to a desiccator and cool them to room temperature, and use a TPMBE-300 flat thermal conductivity meter to test the thermal conductivity λ of the specimens. Test three parallel samples for each sample and take the average value.

[0075] Tensile bond strength test:

[0076] The mortar was sampled and tested in accordance with the Industry Standard of the People's Republic of China JGJ / T 70-2009 "Standard for Test Methods of Basic Properties of Building Mortars". The mortar slurries were the mortar samples prepared in the examples and comparative examples. 10 parallel samples were tested for each sample, and the results were averaged.

[0077] The phenomenon of efflorescence on the wall surface occurs when red brick walls or silicate concrete are used in construction. After a period of time, crystal-like frost appears on the wall surface. If the wall surface is painted with paint, problems such as bulging, peeling, and falling off will occur, seriously affecting the appearance of the wall surface. Once the efflorescence phenomenon appears, some treatment methods can only solve the problem temporarily, and the efflorescence will appear again after a period of time. Therefore, it is very important to prevent it in advance. The key to preventing efflorescence is to solve the problem of cement efflorescence before construction. The general solution is to use a tile anti-efflorescence agent.

[0078] Efflorescence test:

[0079] The mortar samples were tested for efflorescence according to the following method: The mortar was evenly smeared on the brick wall, and the thickness of the mortar layer was 2-4 mm. After 1 hour of smearing, water was sprayed on the mortar layer. Water was sprayed for 4 minutes every 5 minutes. After 8 hours, the appearance of white crystals on the mortar layer was observed, and the white crystal situation was divided into 5 grades: none, mild, moderate, strong, and very strong.

[0080] The above test results are shown in Table 1.

[0081] Table 1 Test Results

[0082]

[0083]

[0084] By comparing Example 1 with Example 2 and Example 3, it can be found that the thermal conductivity and tensile bond performance of Example 1 are superior to those of Example 2 and Example 3. This may be because after expanded perlite is modified by tetraethyl orthosilicate and chloropropyltriethoxysilane, silica and cage-type hemisilsesquioxane are generated inside and on the surface, increasing the hardness of expanded perlite, enhancing the wear resistance of the mortar layer, and at the same time improving the bonding force between expanded perlite and materials such as cement and polyurethane, and forming a hydrophobic film on the surface of expanded perlite, reducing the influence of water on the thermal conductivity of expanded perlite. At the same time, after the mortar is used, since the wall and cement contain calcium hydroxide, in a humid environment, calcium hydroxide will precipitate and contact carbon dioxide in the humid air to form calcium carbonate crystals, affecting the beauty of the wall. In Example 1, since silica is loaded in the expanded perlite, it contacts calcium hydroxide inside the mortar to generate calcium silicate and water. Calcium silicate has flame retardancy and low thermal conductivity, reducing the thermal conductivity of the mortar and improving the heat insulation performance and flame retardancy of the mortar; during the process of modifying expanded perlite with chloropropyltriethoxysilane and tetraethyl orthosilicate, the ethoxy groups in chloropropyltriethoxysilane hydrolyze and connect with the hydroxyl groups on the surface of the generated silica and the surface of expanded perlite to form silicon-oxygen bonds, strengthening the bonding force between expanded perlite and materials such as cement and polyurethane and the interfacial base material, making the structure of the modified perlite thermal insulation material more stable, enhancing the adhesion of the mortar layer to the interfacial base material, and improving the wear resistance of the mortar layer.

[0085] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An outdoor wall cement mortar, characterized in that, Comprising raw materials in the following parts by mass, 200 - 400 parts of gelling material, 500 - 800 parts of sand, 20 - 50 parts of water-soluble acrylic resin, 80 - 150 parts of jade powder, 300 - 600 parts of modified perlite thermal insulation material, 2 - 5 parts of water reducer, 500 - 800 parts of water; Among them, the gelling material is obtained by mixing cement and waterborne polyurethane; The modified perlite thermal insulation material is obtained by reacting expanded perlite with a silane coupling agent under the action of an organotin additive.

2. The cement mortar for outdoor wall surfaces according to claim 1, wherein, The preparation method of the modified perlite thermal insulation material comprises, in parts by mass, Mixing 100 - 200 parts of water, 100 - 200 parts of ammonia water, and 800 - 1000 parts of methanol evenly to obtain a mixed solution; Mixing 300 - 500 parts of tetraethyl orthosilicate and 800 - 1000 parts of methanol to obtain a functional solution; Adding the mixed solution to the functional solution, and then adding 300 - 500 parts of expanded perlite, and stirring at a speed of 300 - 500 rpm for 12 - 48 h to obtain a mixture; Adding 100 - 120 parts of hydrochloric acid and 2500 - 4000 parts of methanol to the mixture, stirring at a speed of 300 - 500 rpm for 30 - 60 min, standing for 36 - 72 h, and then adding 2 - 5 parts of dibutyltin dilaurate, and stirring at a speed of 300 - 500 rpm for 36 - 72 h to obtain the modified perlite thermal insulation material.

3. The exterior wall cement mortar according to claim 1, wherein The preparation method of the modified perlite thermal insulation material comprises, in parts by mass, Mixing 100 - 200 parts of water, 100 - 200 parts of ammonia water, and 800 - 1000 parts of methanol evenly to obtain a mixed solution, then adding 300 - 500 parts of expanded perlite and 800 - 1000 parts of methanol, and stirring at a speed of 300 - 500 rpm for 12 - 48 h to obtain a mixture; Adding 100 - 120 parts of hydrochloric acid and 2500 - 4000 parts of methanol to the mixture, stirring at a speed of 300 - 500 rpm for 30 - 60 min, then maintaining stirring and dripping 300 - 500 parts of chloropropyltriethoxysilane at a dripping rate of 1 - 3 mL / s, standing for 36 - 72 h after dripping, and then adding 2 - 5 parts of dibutyltin dilaurate, and stirring at a speed of 300 - 500 rpm for 36 - 72 h to obtain the modified perlite thermal insulation material.

4. The exterior wall cement mortar according to claim 1, characterized in that, The preparation method of the modified perlite thermal insulation material comprises, in parts by mass, Mixing 100 - 200 parts of water, 100 - 200 parts of ammonia water, and 800 - 1000 parts of methanol evenly to obtain a mixed solution; Mixing 300 - 500 parts of tetraethyl orthosilicate and 800 - 1000 parts of methanol to obtain a functional solution; Adding the mixed solution to the functional solution, and then adding 300 - 500 parts of expanded perlite, and stirring at a speed of 300 - 500 rpm for 12 - 48 h to obtain a mixture; 100 to 120 parts of hydrochloric acid and 2500 to 4000 parts of methanol are added to the mixture, stirred at a speed of 300 to 500 rpm / min for 30 to 60 min, then stirring is maintained and 300 to 500 parts of chloropropyltriethoxysilane are added dropwise at a dropping rate of 1 to 3 mL / s. After the dropping is completed, it is left standing for 36 to 72 h, then 2 to 5 parts of dibutyltin dilaurate are added, and it is stirred at a speed of 300 to 500 rpm / min for 36 to 72 h to obtain a modified perlite thermal insulation material.

5. The exterior wall cement mortar according to claim 1, wherein The mass ratio of cement to waterborne polyurethane in the cementitious material is 3 to 6:1 to 2.

6. The exterior wall cement mortar according to any one of claims 1 to 5, characterized in that, The expanded perlite is obtained by calcining perlite at 1000 to 1300 °C for 1 to 3 h.

7. The exterior wall cement mortar according to claim 6, characterized in that, The particle size of the expanded perlite is 200 to 300 mesh.

8. A method for preparing the cement mortar for outdoor wall surfaces according to any one of claims 1 to 7, characterized in that, Including, The water reducing agent, part of the water, and the modified perlite thermal insulation material are mixed and stirred to obtain a mixed material; The cementitious material, water-soluble acrylic resin, jade powder, the remaining water, sand, and the mixed material are mixed and stirred. After the stirring is completed, it is left standing and then stirred again to obtain cement mortar.

9. The preparation method of the cement mortar for the outdoor wall surface according to claim 8, characterized in that, The stirring rate is 50 to 100 rpm / min.

10. The preparation method of the cement mortar for outdoor wall surfaces according to claim 8, characterized in that, The standing is maintained at 40 to 60 °C for 1 to 3 h.

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