Moistureproof thermal insulation mortar and preparation method thereof
By combining modified polypropylene fibers with other components, a moisture-proof and thermal insulation mortar was prepared, which solved the problems of poor waterproof and crack-resistant performance of existing thermal insulation mortars and the adhesion of polypropylene fibers. This resulted in improved moisture-proof, mildew-proof, and thermal insulation performance of the wall, as well as enhanced wall stability.
Patent Information
- Application Number
- CN202511962188.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-24
- Publication Date
- 2026-02-24
AI Technical Summary
Existing thermal insulation mortars have poor waterproof and crack-resistant properties, are prone to cracking and water seepage leading to a decline in thermal insulation performance, and have poor adhesion between polypropylene fibers and cement matrix, affecting the moisture-proof and mildew-proof performance of the wall.
A moisture-proof and heat-insulating mortar is prepared by mixing modified polypropylene fibers with vitrified microspheres, redispersible latex powder, waterproofing agent, and other components in a specific ratio, and adding waterproofing agent and modification treatment to improve bonding and waterproofing performance.
It improves the waterproof, mildew-proof, and thermal insulation properties of the walls, reduces leakage and mold growth, prevents powdering and cracking, extends the service life of buildings, and reduces maintenance costs.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] This invention relates to the field of thermal insulation mortar technology, specifically to a moisture-proof and thermal insulation mortar and its preparation method. Background Technology
[0002] With the rapid development of my country's construction industry, the demand for building materials is gradually increasing, and building materials with excellent thermal insulation properties are widely used. Among them, thermal insulation mortar, as an important material for exterior wall insulation and interior plastering, is favored by consumers due to its convenient construction, good adhesion to the substrate, and strong integrity.
[0003] Thermal insulation mortar typically refers to mortar made by mixing thermal insulation aggregates, cementitious materials, and admixtures in a certain proportion. Depending on the type of thermal insulation aggregate, it can be categorized into polystyrene particle (EPS) thermal insulation mortar, expanded perlite thermal insulation mortar, and vitrified microsphere thermal insulation mortar, among others. However, all of these thermal insulation mortars have varying degrees of defects. For example, thermal insulation mortars with expanded polystyrene particles, expanded perlite particles, or vitrified microspheres added to cement have poor waterproofing and crack-resistant properties. When the exterior wall cracks, water can seep into the wall along the cracks. Since water has a high thermal conductivity, the presence of water inside the wall significantly reduces its insulation performance. Furthermore, the presence of water inside the wall easily leads to mold growth and wall damage.
[0004] Furthermore, due to the low pull-out strength of ordinary cement mortar and its constant exposure to wind, sun, temperature, and humidity changes, stress concentration easily occurs in the wall's bonding layer, leading to hollow areas and, in severe cases, wall detachment. After detachment, rainwater enters the wall through cracks, damaging internal functional layers and ultimately causing mold growth and further wall damage. Fibers, as reinforcing materials, can effectively inhibit wall cracking and powdering, and improve strength when used in cement mortar. Polypropylene fibers, a hydrocarbon polymer, are commonly used in cement mortar to improve its various properties. However, polypropylene fibers have poor hydrophilicity, resulting in poor adhesion to the cement matrix. During mixing with cement mortar, polypropylene fibers are prone to agglomeration and difficulty in dispersion, thus affecting the mortar's performance. Therefore, providing a building mortar material that combines moisture resistance, mold prevention, and thermal insulation properties, while preventing wall powdering and detachment, is of great significance. Summary of the Invention
[0005] In view of this, the present invention provides a moisture-proof and heat-insulating mortar, wherein the heat-insulating mortar comprises the following components by weight: 100-150 parts cement, 40-55 parts vitrified microspheres, 12-28 parts redispersible latex powder, 1.3-2.5 parts hydroxypropyl methylcellulose ether, 8-12 parts waterproofing agent, 0.5-0.8 parts modified polypropylene fiber, and 10-15 parts water-reducing agent.
[0006] Preferably, the thermal insulation mortar comprises the following components: 110-130 parts cement, 45-50 parts vitrified microspheres, 15-25 parts redispersible latex powder, 1.5-2.0 parts hydroxypropyl methylcellulose ether, 9-11 parts waterproofing agent, 0.6-0.8 parts modified polypropylene fiber, and 12-14 parts water-reducing agent.
[0007] More preferably, the thermal insulation mortar comprises the following components: 120 parts cement, 48 parts vitrified microspheres, 22 parts redispersible latex powder, 1.6 parts hydroxypropyl methylcellulose ether, 10 parts waterproofing agent, 0.7 parts modified polypropylene fiber, and 13 parts water-reducing agent.
[0008] Furthermore, the method for preparing the waterproofing agent includes: under an inert atmosphere, using potassium hydroxide as a catalyst, mixing glycerol, lauric acid, and decaglycerol and then reacting them in a reaction vessel to obtain the waterproofing agent.
[0009] Furthermore, the reaction temperature is 150-200℃ and the reaction time is 1-1.5h, preferably, the reaction temperature is 180℃ and the reaction time is 1.2h.
[0010] Furthermore, the molar ratio of lauric acid to decaglycerol is 1:1.
[0011] Furthermore, the amount of catalyst used accounts for 0.1%-0.25% of the total mass of the reaction system, preferably, the amount of catalyst used accounts for 0.20% of the total mass of the reaction system.
[0012] Furthermore, the amount of glycerol used accounts for 5%-30% of the total mass of the reaction system, preferably 18% of the total mass of the reaction system.
[0013] Furthermore, the method for preparing the modified polypropylene fiber includes: (1) Dissolve gallocatechin gallate in Tris-HCl buffer to obtain solution A; dissolve polyethyleneimine in Tris-HCl buffer to obtain solution B; mix solution A and solution B evenly to obtain the modifier solution for later use; (2) Soak polypropylene fibers in ethyl acetate and let stand at room temperature for 10-25 min. Take them out and wash them thoroughly with deionized water. Then transfer them to the modifier solution and soak them while stirring and reacting. After the reaction is complete, take them out and wash them with deionized water. Then place the washed polypropylene fibers in a metal salt solution and react for 3-10 min. After the reaction is complete, take them out and wash them with deionized water. Dry them at 60℃ for 1.5 h to obtain modified polypropylene fibers.
[0014] Furthermore, in step (1), the concentration of gallocatechin gallate in solution A is 3-5 mg / ml, preferably, the concentration of gallocatechin gallate in solution A is 4 mg / ml.
[0015] Furthermore, the concentration of polyethyleneimine in solution B in step (1) is 1-2 mg / ml, preferably 1.5 mg / ml.
[0016] Furthermore, the ambient temperature during the preparation of the modifier solution in step (1) is controlled at 28-35℃, preferably, the ambient temperature during the preparation of the modifier solution is controlled at 30℃.
[0017] Further, the Tris-HCl buffer (50 mmol / L, pH=8.5, 100 mL) described in step (1).
[0018] Furthermore, the stirring reaction time in step (2) is 3-8 hours and the reaction temperature is 22-27°C. Preferably, the stirring reaction time is 4 hours and the reaction temperature is 25°C.
[0019] Furthermore, the formulation method of the metal salt solution in step (2) is as follows: weigh 0.1g of hafnium oxychloride and dissolve it in 200mL of hydrochloric acid solution with a concentration of 0.1mol / L to obtain the metal salt solution.
[0020] A method for preparing a moisture-proof and heat-insulating mortar, the method comprising mixing the raw materials evenly according to the formula ratio.
[0021] A moisture-proof and heat-insulating mortar is made by mixing moisture-proof and heat-insulating mortar with water, wherein the weight ratio of the moisture-proof and heat-insulating mortar to water is 1:0.5-0.8.
[0022] Compared with the prior art, the present invention has the following beneficial effects: The waterproof and thermal insulation mortar provided by this invention can effectively improve the waterproof, mildew-proof, and thermal insulation performance of walls, prevent moisture from eroding the wall structure, and reduce leakage and mold growth.
[0023] This invention introduces modified polypropylene fibers into the mortar formula, which, together with other raw materials, synergistically improve the wall's bonding and mechanical properties, prevent powdering and cracking, extend the building's service life, reduce the frequency of repairs and replacements, and lower building maintenance costs. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.
[0025] Unless otherwise specified, the test methods or experimental methods described in the following examples are all conventional methods; unless otherwise specified, the raw materials and additives are obtained from conventional commercial sources or prepared by conventional methods.
[0026] The raw materials used in the following examples and comparative examples are: The cement is No. 42.5 ordinary Portland cement.
[0027] Vitrified microspheres, purchased from Guangxi Huai'ai Insulation Building Materials Co., Ltd., with a bulk dry density of 88 kg / m³. 3 The compressive strength of the cylinder is 173 kPa, the volumetric water absorption rate is 15%, the particle size range is 0.10-1.8 mm, and the bulk density is 120-150 kg / m³. 3 Thermal conductivity 0.05 W / (m·K), closed-cell rate 92%.
[0028] The redispersible latex powder was purchased from Zhengzhou Runcheng Chemical Building Materials Co., Ltd. in Henan Province and is in powder form.
[0029] Hydroxypropyl methylcellulose ether (HPMC) was purchased from Hebei Shijiazhuang Ruixin Cellulose Co., Ltd.
[0030] Polypropylene fiber, 5mm in length, 55µm in diameter, with an elastic modulus greater than 3.0 GPa and a tensile strength greater than 350MPa.
[0031] Water-reducing agents, polycarboxylate water-reducing agents have a water-reducing efficiency of 28%-35%.
[0032] Deca-glycerol, purchased from Aladdin Biochemical Technology Co., Ltd.
[0033] Lauric acid, purchased from Aladdin Biochemical Technology Co., Ltd.
[0034] Gallocatechin gallate, purchased from Shanghai Yuanye Biotechnology Co., Ltd.
[0035] Example 1 A method for preparing moisture-proof and heat-insulating mortar, the specific steps of which are as follows: Mix 120 parts cement, 48 parts vitrified microspheres, 22 parts redispersible latex powder, 1.6 parts hydroxypropyl methylcellulose ether, 10 parts waterproofing agent, 0.7 parts modified polypropylene fiber, and 13 parts water-reducing agent in the specified proportions to obtain a moisture-proof and heat-insulating mortar.
[0036] The preparation method of the waterproofing agent is as follows: Under an inert atmosphere, using potassium hydroxide as a catalyst, glycerol, lauric acid, and decaglycerol were mixed and placed in a reaction vessel and reacted at 180°C for 1.2 h to obtain a waterproofing agent. The amount of catalyst accounted for 0.20% of the total mass of the reaction system, the amount of glycerol accounted for 18% of the total mass of the reaction system, and the molar ratio of lauric acid to decaglycerol was 1:1.
[0037] The method for preparing the modified polypropylene fiber is as follows: (1) Dissolve gallic acid gallate in Tris-HCl buffer (45 mmol / L, pH=8.0, 100 mL) to obtain solution A with a concentration of 4 mg / mL; dissolve polyethyleneimine in Tris-HCl buffer (45 mmol / L, pH=8.0, 100 mL) to obtain solution B with a concentration of 1.5 mg / mL; mix solution A and solution B evenly to obtain the modifier solution for later use; (2) Soak polypropylene fibers in ethyl acetate and let stand at room temperature for 10-25 min. Take them out and wash them thoroughly with deionized water. Then transfer them to the modifier solution and soak them while stirring. The reaction temperature is 25℃ and the reaction time is 4 h. After the reaction is completed, take them out and wash them thoroughly with deionized water. Then place the washed polypropylene fibers in a metal salt solution (weigh 0.1 g hafnium oxychloride and dissolve it in 200 mL of 0.1 mol / L hydrochloric acid solution to obtain the metal salt solution). React for 7 min. After the reaction is completed, take them out, wash them with deionized water, and dry them at 60℃ for 1.5 h to obtain modified polypropylene fibers.
[0038] Example 2 A method for preparing moisture-proof and heat-insulating mortar, the specific steps of which are as follows: 100 parts cement, 40 parts vitrified microspheres, 12 parts redispersible latex powder, 1.3 parts hydroxypropyl methylcellulose ether, 8 parts waterproofing agent, 0.5 parts modified polypropylene fiber, and 10 parts water-reducing agent are mixed in proportion to obtain moisture-proof and heat-insulating mortar.
[0039] Example 3 A method for preparing moisture-proof and heat-insulating mortar, the specific steps of which are as follows: 130 parts cement, 50 parts vitrified microspheres, 25 parts redispersible latex powder, 2.0 parts hydroxypropyl methylcellulose ether, 11 parts waterproofing agent, 0.8 parts modified polypropylene fiber, and 14 parts water-reducing agent are mixed in proportion to obtain moisture-proof and heat-insulating mortar.
[0040] Example 4 The moisture-proof and heat-insulating mortar prepared in Example 1 was mixed with water at a mass ratio of 1:0.8 to obtain a moisture-proof and heat-insulating mortar slurry.
[0041] Example 5 The moisture-proof and heat-insulating mortar prepared in Example 2 was mixed with water at a mass ratio of 1:0.8 to obtain a moisture-proof and heat-insulating mortar slurry.
[0042] Example 6 The moisture-proof and heat-insulating mortar prepared in Example 3 was mixed with water at a mass ratio of 1:0.8 to obtain a moisture-proof and heat-insulating mortar slurry.
[0043] Comparative Example 1 The difference from Example 1 is that it does not contain modified polypropylene fibers.
[0044] Comparative Example 2 The difference from Example 1 is that the modified polypropylene fiber is replaced with an equal amount of polypropylene fiber.
[0045] Comparative Example 3 The difference from Example 1 is that it does not contain a waterproofing agent.
[0046] Comparative Example 4 The moisture-proof and heat-insulating mortar prepared in Comparative Example 1 was mixed with water at a mass ratio of 1:0.8 to obtain a moisture-proof and heat-insulating mortar paste.
[0047] Comparative Example 5 The moisture-proof and heat-insulating mortar prepared in Comparative Example 2 was mixed with water at a mass ratio of 1:0.8 to obtain a moisture-proof and heat-insulating mortar paste.
[0048] Comparative Example 6 The moisture-proof and heat-insulating mortar prepared in Comparative Example 3 was mixed with water at a mass ratio of 1:0.8 to obtain a moisture-proof and heat-insulating mortar paste.
[0049] The moisture-proof and thermal insulation mortar slurries prepared in Examples 4-6 and Comparative Examples 4-6 were made into standard test blocks of 70mm×70mm×70mm according to relevant standards. After natural curing, the compressive strength, thermal conductivity, moisture content, and bond strength of the standard test blocks were tested. Environmental conditions: 25±1℃, relative humidity 70±5%.
[0050] Test method: Thermal conductivity was measured in accordance with GB / T 10295.
[0051] Compressive strength was determined in accordance with GB / T 5486-2008 standard.
[0052] Water absorption rate was determined in accordance with GB / T 5486-2008 standard.
[0053] The bonding strength was determined according to JCT 547-2005 "Ceramic Wall and Floor Tile Adhesive". The pull-out joint was glued to the tile with epoxy resin adhesive. After 24 hours, the mortar bonding strength was determined using a WDS-10 type LCD electronic universal tester.
[0054] As shown in the table above, the addition of modified polypropylene fibers can effectively improve the bonding strength and compressive strength of mortar test blocks, preventing wall powdering and detachment. Simultaneously, the addition of a waterproofing agent can effectively improve the moisture-proof, waterproof, and mildew-proof properties of the mortar test blocks.
[0055] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A moisture-proof and heat-insulating mortar, characterized in that, The thermal insulation mortar comprises the following components by weight: 100-150 parts cement, 40-55 parts vitrified microspheres, 12-28 parts redispersible latex powder, 1.3-2.5 parts hydroxypropyl methylcellulose ether, 8-12 parts waterproofing agent, 0.5-0.8 parts modified polypropylene fiber, and 10-15 parts water-reducing agent.
2. The moisture-proof and heat-insulating mortar according to claim 1, characterized in that, The method for preparing the waterproofing agent includes: under an inert atmosphere, using potassium hydroxide as a catalyst, mixing glycerol, lauric acid and decaglycerol and then reacting them in a reaction vessel to obtain the waterproofing agent.
3. The moisture-proof and heat-insulating mortar according to claim 2, characterized in that, The reaction temperature is 150-200℃, and the reaction time is 1-1.5h.
4. The moisture-proof and heat-insulating mortar according to claim 2, characterized in that, The molar ratio of lauric acid to decaglycerol is 1:1, the amount of catalyst is 0.1%-0.25% of the total mass of the reaction system, and the amount of glycerol is 5%-30% of the total mass of the reaction system.
5. The moisture-proof and heat-insulating mortar according to claim 1, characterized in that, The method for preparing the modified polypropylene fiber includes: (1) Dissolve gallocatechin gallate in Tris-HCl buffer to obtain solution A; dissolve polyethyleneimine in Tris-HCl buffer to obtain solution B; mix solution A and solution B evenly to obtain the modifier solution for later use; (2) Soak polypropylene fibers in ethyl acetate and let stand at room temperature for 10-25 min. Take them out and wash them thoroughly with deionized water. Then transfer them to the modifier solution and soak them while stirring and reacting. After the reaction is complete, take them out and wash them with deionized water. Then place the washed polypropylene fibers in a metal salt solution and react for 3-10 min. After the reaction is complete, take them out and wash them with deionized water. Dry them at 60℃ for 1.5 h to obtain modified polypropylene fibers.
6. The moisture-proof and heat-insulating mortar according to claim 5, characterized in that, In step (1), the concentration of gallocatechin gallate in solution A is 3-5 mg / ml, and the concentration of polyethyleneimine in solution B is 1-2 mg / ml.
7. The moisture-proof and heat-insulating mortar according to claim 5, characterized in that, The stirring reaction time in step (2) is 3-8 hours, and the reaction temperature is 22-27℃.
8. The moisture-proof and heat-insulating mortar according to claim 5, characterized in that, The formulation method of the metal salt solution in step (2) is as follows: weigh 0.1g of hafnium oxychloride and dissolve it in 200mL of hydrochloric acid solution with a concentration of 0.1mol / L to obtain the metal salt solution.
9. A method for preparing moisture-proof and heat-insulating mortar according to any one of claims 1-8, characterized in that, Simply mix all the ingredients evenly according to the formula ratio.
10. A moisture-proof and heat-insulating mortar, comprising the moisture-proof and heat-insulating mortar according to any one of claims 1-8 and water, characterized in that, The weight ratio of the moisture-proof and heat-insulating mortar to water is 1:0.5-0.8.