High-molecular polymer cement coating for roof waterproofing and preparation method of high-molecular polymer cement coating
By mixing polymer emulsion with cement paste and using modified fibers to form an interpenetrating network structure, the cracking problem of traditional cement-based waterproof coatings during thermal expansion and contraction and substrate deformation is solved, thus achieving a high-performance roof waterproof coating.
Patent Information
- Application Number
- CN202610014833.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-07
- Publication Date
- 2026-02-17
AI Technical Summary
Traditional cement-based waterproof coatings can develop minute displacements and cracks due to thermal expansion and contraction and substrate settlement or vibration during nighttime temperature differences and seasonal changes. The rigid coating cannot follow the deformation of the substrate, resulting in the coating being torn.
By mixing polymer emulsion with cement paste and using modified fibers as a three-dimensional reinforcing skeleton to form an interpenetrating network structure, the flexibility and strength of the coating are improved, and the tensile strength and impact resistance are enhanced.
It enables high-performance application of polymer cementitious coatings in harsh environments, shortens construction time, and improves crack resistance and durability.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of waterproof coating technology, specifically relating to a polymer cement coating for roof waterproofing and its preparation method. Background Technology
[0002] Waterproof coatings are a process technology that forms a continuous sealing layer on the surface of a material to block the penetration of moisture. Its core properties include hydrostatic pressure resistance and breathability balance, and it is used in textiles, construction, electronic devices and other fields.
[0003] In construction, it is mainly used in areas that are exposed to water for a long time, such as roofs, basements, and bathrooms. It must have high impermeability and adhesion. Traditional cement-based waterproof coatings are rigid after film formation. Roofs will expand and contract due to temperature differences between day and night and seasonal changes. The base layer will also have slight displacement and cracks due to settlement or vibration. The rigid film cannot follow the deformation of the base surface, which will cause the coating to crack. Summary of the Invention
[0004] The purpose of this invention is to provide a polymer cement coating for roof waterproofing and its preparation method in order to solve the above-mentioned problems.
[0005] The present invention achieves the above objectives through the following technical solutions: This invention provides a polymer cement coating for roof waterproofing, which is composed of a polymer emulsion and a cement paste. The raw materials for preparing the polymer emulsion, by weight, include: 40-55 parts acrylate emulsion, 2-4 parts carbon black, 5-10 parts dodecyl alcohol ester, 8-16 parts modified fiber, and 20-35 parts deionized water; the raw materials for preparing the cement paste include: 60-75 parts silicate cement, 10-20 parts quartz powder, 5-12 parts heavy calcium carbonate, 4-8 parts cellulose ether, 1-3 parts calcium formate, 2-6 parts polycarboxylic acid, and 30-35 parts tap water.
[0006] As a further optimization of the present invention, the preparation process of the modified fiber is as follows: Soak PP short fibers in warm water at 60-70℃ for 10-15 minutes, then place them in a forced-air drying oven at 50℃ to dry thoroughly for later use. Calcium carbonate and silicon dioxide were dried in an oven at 105°C for 2 hours and set aside for later use. The acrylic resin was placed in a reactor, heated to 65°C, and stirred at 300 rpm for 10 minutes. After stirring, calcium carbonate and silicon dioxide were added, and the mixture was stirred at 1200 rpm for 30 minutes to obtain the resin slurry. The silane coupling agent was added dropwise to deionized water, ethanol was added, and the mixture was stirred at 60 rpm for 10 min. The pH value was adjusted to 4.5 with acetic acid to obtain the hydrolytic coupling agent. The hydrolytic coupling agent was added dropwise to the resin slurry, stirred at 60 rpm for 45 minutes, and then placed in a 30°C environment for 30 minutes after stirring was stopped to obtain the coated slurry. Add PP short fibers, stir at 300 rpm for 30 minutes, and filter through a sieve to separate out excess coated slurry; The wet fibers with coating sizing agent are loosely laid in a hydrophobic tray, ensuring that there are gaps between the fibers. The tray is then placed in a forced-air drying oven and dried at 50-60℃ for 60 minutes. The temperature is then increased to 80-100℃ and dried for 60-120 minutes. The heating is then stopped, and the fibers are allowed to cool naturally to obtain the modified fibers.
[0007] As a further optimization of the present invention, the raw materials for preparing the coating slurry, by weight, include: 30-50 parts acrylic resin, 6-12 parts calcium carbonate, 12-16 parts silica, 8-15 parts silane coupling agent, 20-25 parts deionized water and 6-12 parts ethanol.
[0008] As a further optimization of the present invention, in the preparation process of modified fiber, PP short fibers are added, stirred at 300 rpm for 30 min, and filtered through a sieve to separate the excess coating slurry; wherein, the specific process of separating the excess coating slurry by sieve filtration is as follows: using a 300-320 mesh sieve, with a vibration frequency of 50 Hz - 60 Hz, sieving for 1-3 min.
[0009] This invention also provides a method for preparing a polymer cement coating for roof waterproofing, comprising the following steps: The preparation process of polymer emulsion is as follows: The acrylic emulsion was added to the reactor, deionized water was added, and the mixture was stirred at 300 rpm for 10 min. Modified fibers were added in batches and stirred at 600 rpm for 20 min to obtain fiber A mixed emulsion. Add dodecyl alcohol ester, stir at 400 rpm for 10 min, add carbon black, stir at 300 rpm for 15 min, stop stirring and let stand for 30 min, filter with an 80-90 mesh screen to obtain polymer emulsion; The preparation process of cement paste is as follows: Silicate cement, quartz powder, heavy calcium carbonate, and tap water are added to a mixer and stirred continuously at 120 rpm for 10 minutes. Cellulose ether is added and stirred for 5 minutes. Calcium formate and polycarboxylate are added and stirred continuously at 500 rpm for 10 minutes. The mixture is then filtered through a 40-60 mesh screen to obtain cement paste. The preparation process of polymer cement coatings is as follows: The polymer emulsion and cement paste were mixed at a 1:1 ratio at a stirring speed of 60 rpm and stirred for 5-10 minutes to obtain a polymer cement coating.
[0010] The beneficial effects of this invention are as follows: The polymer cement coating of this invention is composed of a polymer emulsion and a cement paste. The modified PP fiber in the polymer emulsion, as a three-dimensional reinforcing skeleton, can effectively transfer and disperse stress, giving the final coating extremely high tensile strength, impact resistance, and crack resistance. The polymer emulsion and cement paste are mixed to form an interpenetrating network structure, which simultaneously possesses the flexibility and weather resistance of organic polymers and the strength and durability of inorganic cement. This improves the mechanical properties, durability, and construction performance of the polymer cement coating, enabling it to be applied to more demanding environments while shortening the construction time. Detailed Implementation
[0011] The present application will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.
[0012] Unless otherwise specified, all methods used in this invention are conventional methods known to those skilled in the art, and all reagents and materials used are commercially available products.
[0013] In this invention, the PP short fibers have a diameter of 30 μm and a length of 6 mm; the silicate cement used in this invention is PO 42.5 cement; and the silane coupling agent used is A151 (vinyltriethoxysilane).
[0014] Example 1 The preparation process of modified fibers is as follows: Soak the PP short fibers in warm water at 60℃ for 10 minutes, then place them in a forced-air drying oven and dry them thoroughly at 50℃ for later use. Calcium carbonate and silicon dioxide were dried in an oven at 105°C for 2 hours and set aside for later use. Place 30 parts of acrylic resin in a reactor, heat to 65°C, stir at 300 rpm for 10 minutes, add 6 parts of calcium carbonate and 12 parts of silica after stirring, adjust to 1200 rpm and stir for 30 minutes to obtain resin slurry; Add 8 parts of silane coupling agent to 20 parts of deionized water, add 6 parts of ethanol, stir at 60 rpm for 10 min, and adjust the pH to 4.5 with acetic acid to obtain the hydrolytic coupling agent. The hydrolytic coupling agent was added dropwise to the resin slurry, stirred at 60 rpm for 45 minutes, and then placed in a 30°C environment for 30 minutes after stirring was stopped to obtain the coated slurry. Add PP short fibers, stir at 300 rpm for 30 min, use a 300 mesh sieve, vibrate at a frequency of 50 Hz, sieve for 1 min, and separate out the excess coated slurry; The wet fibers coated with sizing agent are loosely laid in a hydrophobic tray, ensuring that there are gaps between the fibers. The tray is then placed in a forced-air drying oven and dried at 50°C for 60 minutes. The temperature is then increased to 80°C and dried for another 60 minutes. The heating is then stopped and the fibers are allowed to cool naturally to obtain the modified fibers. The preparation process of polymer emulsion is as follows: Add 40 parts of acrylic emulsion to the reactor, add 20 parts of deionized water, stir at 300 rpm for 10 min, add 8 parts of modified fiber in batches, stir at 600 rpm for 20 min to obtain fiber A mixed emulsion; Add 5 parts dodecyl alcohol ester, stir at 400 rpm for 10 min, add 2 parts carbon black, stir at 300 rpm for 15 min, stop stirring and let stand for 30 min, filter with an 80 mesh screen to obtain polymer emulsion; The preparation process of cement paste is as follows: Add 60 parts silicate cement, 10 parts quartz powder, 5 parts heavy calcium carbonate, and 30 parts tap water to a mixer and stir continuously at 120 rpm for 10 minutes. Add 4 parts cellulose ether and stir for 5 minutes. Then add 1 part calcium formate and 2 parts polycarboxylate and stir continuously at 500 rpm for 10 minutes. Filter with a 40-mesh screen to obtain cement paste. The preparation process of polymer cement coatings is as follows: The polymer emulsion and cement paste were mixed at a 1:1 ratio at a stirring speed of 60 rpm and stirred for 5 minutes to obtain a polymer cement coating.
[0015] Example 2 The preparation process of modified fibers is as follows: Soak the PP short fibers in warm water at 65℃ for 12 minutes, then place them in a forced-air drying oven and dry them thoroughly at 50℃ for later use. Calcium carbonate and silicon dioxide were dried in an oven at 105°C for 2 hours and set aside for later use. 40 parts of acrylic resin were placed in a reactor, heated to 65°C, and stirred at 300 rpm for 10 minutes. After stirring, 8 parts of calcium carbonate and 14 parts of silica were added, and the mixture was stirred at 1200 rpm for 30 minutes to obtain the resin slurry. 12 parts of silane coupling agent were added dropwise to 22 parts of deionized water, 8 parts of ethanol were added, and the mixture was stirred at 60 rpm for 10 min. The pH value was adjusted to 4.5 with acetic acid to obtain the hydrolytic coupling agent. The hydrolytic coupling agent was added dropwise to the resin slurry, stirred at 60 rpm for 45 minutes, and then placed in a 30°C environment for 30 minutes after stirring was stopped to obtain the coated slurry. Add PP short fibers, stir at 300 rpm for 30 min, use a 310 mesh sieve, vibrate at 55 Hz, and sieve for 3 min to separate out excess coated slurry; The wet fibers coated with sizing agent are loosely laid in a hydrophobic tray, ensuring that there are gaps between the fibers. The tray is then placed in a forced-air drying oven and dried at 55°C for 60 minutes. The temperature is then increased to 90°C and dried for another 90 minutes. The heating is then stopped and the fibers are allowed to cool naturally to obtain the modified fibers. The preparation process of polymer emulsion is as follows: Add 50 parts of acrylic emulsion to the reactor, add 29 parts of deionized water, stir at 300 rpm for 10 min, add 12 parts of modified fiber in batches, stir at 600 rpm for 20 min to obtain fiber A mixed emulsion. Add 8 parts dodecyl alcohol ester, stir at 400 rpm for 10 min, add 3 parts carbon black, stir at 300 rpm for 15 min, stop stirring and let stand for 30 min, filter with an 85 mesh filter to obtain polymer emulsion; The preparation process of cement paste is as follows: Add 72 parts silicate cement, 15 parts quartz powder, 11 parts heavy calcium carbonate, and 31 parts tap water into a mixer and stir continuously at 120 rpm for 10 minutes. Add 5 parts cellulose ether and stir for 5 minutes. Then add 2 parts calcium formate and 5 parts polycarboxylate and stir continuously at 500 rpm for 10 minutes. Filter with a 50-mesh filter to obtain cement paste. The preparation process of polymer cement coatings is as follows: The polymer emulsion and cement paste were mixed at a 1:1 ratio at a stirring speed of 60 rpm and stirred for 8 minutes to obtain a polymer cement coating.
[0016] Example 3 The preparation process of modified fibers is as follows: Soak PP short fibers in warm water at 70℃ for 15 minutes, then place them in a forced-air drying oven at 50℃ to dry thoroughly for later use; Calcium carbonate and silicon dioxide were dried in an oven at 105°C for 2 hours and set aside for later use. Place 50 parts of acrylic resin in a reactor, heat to 65°C, stir at 300 rpm for 10 minutes, add 12 parts of calcium carbonate and 16 parts of silica after stirring, adjust to 1200 rpm and stir for 30 minutes to obtain resin slurry; Add 15 parts of silane coupling agent to 25 parts of deionized water, add 12 parts of ethanol, stir at 60 rpm for 10 min, and adjust the pH to 4.5 with acetic acid to obtain the hydrolytic coupling agent. The hydrolytic coupling agent was added dropwise to the resin slurry, stirred at 60 rpm for 45 minutes, and then placed in a 30°C environment for 30 minutes after stirring was stopped to obtain the coated slurry. Add PP short fibers, stir at 300 rpm for 30 min, use a 320 mesh sieve, vibrate at 60 Hz, and sieve for 3 min to separate out excess coated slurry; The wet fibers coated with sizing agent are loosely laid in a hydrophobic tray, ensuring that there are gaps between the fibers. The tray is then placed in a forced-air drying oven and dried at 60°C for 60 minutes. The temperature is then increased to 100°C and dried for 120 minutes. The heating is then stopped and the fibers are allowed to cool naturally to obtain the modified fibers. The preparation process of polymer emulsion is as follows: Add 55 parts of acrylic emulsion to the reactor, add 35 parts of deionized water, stir at 300 rpm for 10 min, add 16 parts of modified fiber in batches, stir at 600 rpm for 20 min to obtain fiber A mixed emulsion. Add 10 parts of dodecyl alcohol ester, stir at 400 rpm for 10 min, add 4 parts of carbon black, stir at 300 rpm for 15 min, stop stirring and let stand for 30 min, filter with a 90 mesh screen to obtain polymer emulsion; The preparation process of cement paste is as follows: Add 75 parts silicate cement, 20 parts quartz powder, 12 parts heavy calcium carbonate, and 35 parts tap water to a mixer and stir continuously at 120 rpm for 10 minutes. Add 8 parts cellulose ether and stir for 5 minutes. Then add 3 parts calcium formate and 6 parts polycarboxylate and stir continuously at 500 rpm for 10 minutes. Filter the mixture through a 60-mesh screen to obtain cement paste. The preparation process of polymer cement coatings is as follows: The polymer emulsion and cement paste were mixed at a 1:1 ratio at a stirring speed of 60 rpm and stirred for 10 minutes to obtain a polymer cement coating.
[0017] Comparative Example 1 The preparation process of modified fibers is as follows: Soak the PP short fibers in warm water at 65℃ for 12 minutes, then place them in a forced-air drying oven and dry them thoroughly at 50℃ for later use. Calcium carbonate and silicon dioxide were dried in an oven at 105°C for 2 hours and set aside for later use. 40 parts of epoxy resin were placed in a reactor, heated to 65°C, and stirred at 300 rpm for 10 minutes. After stirring, 8 parts of calcium carbonate and 14 parts of silicon dioxide were added, and the mixture was stirred at 1200 rpm for 30 minutes to obtain the resin slurry. 12 parts of silane coupling agent were added dropwise to 22 parts of deionized water, 8 parts of ethanol were added, and the mixture was stirred at 60 rpm for 10 min. The pH value was adjusted to 4.5 with acetic acid to obtain the hydrolytic coupling agent. The hydrolytic coupling agent was added dropwise to the resin slurry, stirred at 60 rpm for 45 minutes, and then placed in a 30°C environment for 30 minutes after stirring was stopped to obtain the coated slurry. Add PP short fibers, stir at 300 rpm for 30 min, use a 310 mesh sieve, vibrate at 55 Hz, and sieve for 3 min to separate out excess coated slurry; The wet fibers coated with sizing agent are loosely laid in a hydrophobic tray, ensuring that there are gaps between the fibers. The tray is then placed in a forced-air drying oven and dried at 55°C for 60 minutes. The temperature is then increased to 90°C and dried for another 90 minutes. The heating is then stopped and the fibers are allowed to cool naturally to obtain the modified fibers. The preparation process of polymer emulsion is as follows: Add 50 parts of acrylic emulsion to the reactor, add 29 parts of deionized water, stir at 300 rpm for 10 min, add 12 parts of modified fiber in batches, stir at 600 rpm for 20 min to obtain fiber A mixed emulsion. Add 8 parts dodecyl alcohol ester, stir at 400 rpm for 10 min, add 3 parts carbon black, stir at 300 rpm for 15 min, stop stirring and let stand for 30 min, filter with an 85 mesh filter to obtain polymer emulsion; The preparation process of cement paste is as follows: Add 72 parts silicate cement, 15 parts quartz powder, 11 parts heavy calcium carbonate, and 31 parts tap water into a mixer and stir continuously at 120 rpm for 10 minutes. Add 5 parts cellulose ether and stir for 5 minutes. Then add 2 parts calcium formate and 5 parts polycarboxylate and stir continuously at 500 rpm for 10 minutes. Filter with a 50-mesh filter to obtain cement paste. The preparation process of polymer cement coatings is as follows: The polymer emulsion and cement paste were mixed at a 1:1 ratio at a stirring speed of 60 rpm and stirred for 8 minutes to obtain a polymer cement coating.
[0018] Comparative Example 2 The preparation process of modified fibers is as follows: Soak the PP short fibers in warm water at 65℃ for 12 minutes, then place them in a forced-air drying oven and dry them thoroughly at 50℃ for later use. Calcium carbonate and silicon dioxide were dried in an oven at 105°C for 2 hours and set aside for later use. 40 parts of acrylic resin were placed in a reactor, heated to 65°C, and stirred at 300 rpm for 10 minutes. After stirring, 8 parts of calcium carbonate and 14 parts of silica were added, and the mixture was stirred at 1200 rpm for 30 minutes to obtain the resin slurry. 12 parts of silane coupling agent were added dropwise to 22 parts of deionized water, 8 parts of ethanol were added, and the mixture was stirred at 60 rpm for 10 min. The pH value was adjusted to 4.5 with acetic acid to obtain the hydrolytic coupling agent. The hydrolytic coupling agent was added dropwise to the resin slurry, stirred at 60 rpm for 45 minutes, and then placed in a 30°C environment for 30 minutes after stirring was stopped to obtain the coated slurry. Add PP short fibers, stir at 300 rpm for 30 min, use a 290 mesh sieve, vibrate at a frequency of 55 Hz, and sieve for 3 min to separate out excess coated slurry; The wet fibers coated with sizing agent are loosely laid in a hydrophobic tray, ensuring that there are gaps between the fibers. The tray is then placed in a forced-air drying oven and dried at 55°C for 60 minutes. The temperature is then increased to 90°C and dried for another 90 minutes. The heating is then stopped and the fibers are allowed to cool naturally to obtain the modified fibers. The preparation process of polymer emulsion is as follows: Add 50 parts of acrylic emulsion to the reactor, add 29 parts of deionized water, stir at 300 rpm for 10 min, add 12 parts of modified fiber in batches, stir at 600 rpm for 20 min to obtain fiber A mixed emulsion. Add 8 parts dodecyl alcohol ester, stir at 400 rpm for 10 min, add 3 parts carbon black, stir at 300 rpm for 15 min, stop stirring and let stand for 30 min, filter with an 85 mesh filter to obtain polymer emulsion; The preparation process of cement paste is as follows: Add 72 parts silicate cement, 15 parts quartz powder, 11 parts heavy calcium carbonate, and 31 parts tap water into a mixer and stir continuously at 120 rpm for 10 minutes. Add 5 parts cellulose ether and stir for 5 minutes. Then add 2 parts calcium formate and 5 parts polycarboxylate and stir continuously at 500 rpm for 10 minutes. Filter with a 50-mesh filter to obtain cement paste. The preparation process of polymer cement coatings is as follows: The polymer emulsion and cement paste were mixed at a 1:1 ratio at a stirring speed of 60 rpm and stirred for 8 minutes to obtain a polymer cement coating.
[0019] Comparative Example 3 The preparation process of modified fibers is as follows: Soak the PP short fibers in warm water at 65℃ for 12 minutes, then place them in a forced-air drying oven and dry them thoroughly at 50℃ for later use. Calcium carbonate and silicon dioxide were dried in an oven at 105°C for 2 hours and set aside for later use. 40 parts of acrylic resin were placed in a reactor, heated to 65°C, and stirred at 300 rpm for 10 minutes. After stirring, 8 parts of calcium carbonate and 14 parts of silica were added, and the mixture was stirred at 1200 rpm for 30 minutes to obtain the resin slurry. 12 parts of silane coupling agent were added dropwise to 22 parts of deionized water, 8 parts of ethanol were added, and the mixture was stirred at 60 rpm for 10 min. The pH value was adjusted to 4.5 with acetic acid to obtain the hydrolytic coupling agent. The hydrolytic coupling agent was added dropwise to the resin slurry, stirred at 60 rpm for 45 minutes, and then placed in a 30°C environment for 30 minutes after stirring was stopped to obtain the coated slurry. Add PP short fibers, stir at 300 rpm for 30 min, use a 330 mesh sieve, vibrate at 55 Hz, and sieve for 3 min to separate out excess coated slurry; The wet fibers coated with sizing agent are loosely laid in a hydrophobic tray, ensuring that there are gaps between the fibers. The tray is then placed in a forced-air drying oven and dried at 55°C for 60 minutes. The temperature is then increased to 90°C and dried for another 90 minutes. The heating is then stopped and the fibers are allowed to cool naturally to obtain the modified fibers. The preparation process of polymer emulsion is as follows: Add 50 parts of acrylic emulsion to the reactor, add 29 parts of deionized water, stir at 300 rpm for 10 min, add 12 parts of modified fiber in batches, stir at 600 rpm for 20 min to obtain fiber A mixed emulsion. Add 8 parts dodecyl alcohol ester, stir at 400 rpm for 10 min, add 3 parts carbon black, stir at 300 rpm for 15 min, stop stirring and let stand for 30 min, filter with an 85 mesh filter to obtain polymer emulsion; The preparation process of cement paste is as follows: Add 72 parts silicate cement, 15 parts quartz powder, 11 parts heavy calcium carbonate, and 31 parts tap water into a mixer and stir continuously at 120 rpm for 10 minutes. Add 5 parts cellulose ether and stir for 5 minutes. Then add 2 parts calcium formate and 5 parts polycarboxylate and stir continuously at 500 rpm for 10 minutes. Filter with a 50-mesh filter to obtain cement paste. The preparation process of polymer cement coatings is as follows: The polymer emulsion and cement paste were mixed at a 1:1 ratio at a stirring speed of 60 rpm and stirred for 8 minutes to obtain a polymer cement coating.
[0020] Comparative Example 4 The preparation process of polymer emulsion is as follows: Add 50 parts of acrylic emulsion to the reactor, add 29 parts of deionized water, stir at 300 rpm for 10 min, add 12 parts of PP short fiber in batches, stir at 600 rpm for 20 min to obtain fiber A mixed emulsion; Add 8 parts dodecyl alcohol ester, stir at 400 rpm for 10 min, add 3 parts carbon black, stir at 300 rpm for 15 min, stop stirring and let stand for 30 min, filter with an 85 mesh filter to obtain polymer emulsion; The preparation process of cement paste is as follows: Add 72 parts silicate cement, 15 parts quartz powder, 11 parts heavy calcium carbonate, and 31 parts tap water into a mixer and stir continuously at 120 rpm for 10 minutes. Add 5 parts cellulose ether and stir for 5 minutes. Then add 2 parts calcium formate and 5 parts polycarboxylate and stir continuously at 500 rpm for 10 minutes. Filter with a 50-mesh filter to obtain cement paste. The preparation process of polymer cement coatings is as follows: The polymer emulsion and cement paste were mixed at a 1:1 ratio at a stirring speed of 60 rpm and stirred for 8 minutes to obtain a polymer cement coating.
[0021] Performance testing (a) The performance of the polymer cement coatings prepared by the methods of Examples 1-3 and Comparative Examples 1-4 was tested according to the test methods in GB / T 23445-2009 "Polymer Cement Waterproof Coatings". The test results are shown in Tables 1-5.
[0022] Table 1 As can be seen from the table above, the polymer cement coatings prepared by the methods of Examples 1-3 have better bonding strength and anti-crack properties, while the polymer cement coatings prepared by the methods of Comparative Examples 1-4 are slightly inferior to those of Examples 1-3 in all aspects.
[0023] Table 2 As can be seen from Table 2, the polymer cement coatings prepared by the methods of Examples 1-3 have good water resistance. After being soaked in water for 168 hours, they still have good physical properties. The polymer cement coatings prepared by the methods of Examples 1-3 can be used for waterproofing roofs in areas with long rainy seasons.
[0024] Table 3 As can be seen from Table 3, the polymer cement coatings prepared by the methods in Examples 1-3 have good alkali resistance and can effectively resist the erosion of the base layer in outdoor alkaline environments.
[0025] Table 4 As can be seen from Table 4, the polymer cement coatings prepared by the methods in Examples 1-3 have good acid resistance, a long service life in outdoor acidic environments, and can effectively resist acid rain erosion.
[0026] Table 5 As can be seen from Table 5, the polymer cement coatings prepared by the methods in Examples 1-3 have shorter surface drying time and shorter actual drying time, which can shorten the construction time in actual use.
[0027] (II) The performance of the polymer cement coatings prepared by the methods in Examples 1-3 and Comparative Examples 1-4 was tested according to the test methods in JG / T 25-2017 "Test Method for Temperature Deterioration Resistance of Architectural Coatings". The test results are shown in Table 6. Table 6 As can be seen from Table 6, the basic physicochemical properties of the polymer cement coatings prepared by the methods in Examples 1-3 were not damaged after experiencing severe cold and thawing, and they can still be used normally and maintain their designed waterproof and mechanical properties.
[0028] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.
Claims
1. A polymer-modified cementitious coating for waterproofing roofs, characterized by, The high polymer cement coating is formed by mixing a polymer emulsion and a cement slurry; The preparation raw materials of the polymer emulsion include 40-55 parts of an acrylate emulsion, 2-4 parts of carbon black, 5-10 parts of dodecanol ester, 8-16 parts of modified fiber and 20-35 parts of deionized water by weight; and the preparation raw materials of the cement slurry include 60-75 parts of Portland cement, 10-20 parts of quartz powder, 5-12 parts of heavy calcium carbonate, 4-8 parts of cellulose ether, 1-3 parts of calcium formate, 2-6 parts of polycarboxylic acid and 30-35 parts of tap water.
2. The polymer cementitious coating for waterproofing of roofs according to claim 1, characterized in that, The preparation process of the modified fiber is as follows: The PP short fibers are soaked in warm water at 60-70℃ for 10-15 minutes, and then dried at 50℃ in a blowing drying box for complete drying, and then prepared for use; The calcium carbonate and the silicon dioxide are dried in an oven at 105℃ for 2 hours, and then prepared for use; The acrylate resin is placed in a reaction kettle, heated to 65℃, and stirred at 300 rpm for 10 minutes; after stirring, the calcium carbonate and the silicon dioxide are added, and the stirring speed is adjusted to 1200 rpm for 30 minutes to obtain a resin slurry; The silane coupling agent is dropped into deionized water, and ethanol is added; the mixture is stirred at 60 rpm for 10 minutes, and the pH value is adjusted to 4.5 by using acetic acid to obtain a hydrolyzed coupling agent; The hydrolyzed coupling agent is dropped into the resin slurry, and the mixture is stirred at 60 rpm for 45 minutes; after stopping the stirring, the mixture is placed in an environment at 30℃ for 30 minutes to obtain a coated slurry; The PP short fibers are added, and the mixture is stirred at 300 rpm for 30 minutes; the excess coated slurry is filtered through a screen to be separated out; The wet fibers with the coated slurry are loosely laid in a hydrophobic tray, and gaps are ensured between the fibers; the fibers are placed in a blowing drying box, dried at 50-60℃ for 60 minutes, heated to 80-100℃ for 60-120 minutes, and then naturally cooled to obtain the modified fibers.
3. The polymer-modified cementitious coating for waterproofing roofs according to claim 2, characterized in that, The preparation raw materials of the coated slurry include 30-50 parts of acrylate resin, 6-12 parts of calcium carbonate, 12-16 parts of silicon dioxide, 8-15 parts of silane coupling agent, 20-25 parts of deionized water and 6-12 parts of ethanol by weight.
4. The polymer-modified cementitious coating for waterproofing roofs according to claim 3, characterized in that, In the preparation process of the modified fiber, the PP short fibers are added, and the mixture is stirred at 300 rpm for 30 minutes; the excess coated slurry is filtered through a screen to be separated out; wherein the specific process of filtering the excess coated slurry through the screen is as follows: a 300-320 mesh screen is used, the vibration frequency is 50 Hz - 60 Hz, and the screening time is 1-3 minutes.
5. A method for preparing the polymer cement coating for waterproofing of roofs according to any one of claims 1 to 4, characterized in that, The steps include: The preparation process of the polymer emulsion is as follows: The acrylate emulsion is added into a reaction kettle, deionized water is added, and the mixture is stirred at 300 rpm for 10 minutes; the modified fiber is added in batches, and the mixture is stirred at 600 rpm for 20 minutes to obtain a fiber A mixed emulsion; The dodecanol ester is added, and the mixture is stirred at 400 rpm for 10 minutes; the carbon black is added, and the mixture is stirred at 300 rpm for 15 minutes; after stopping the stirring, the mixture is left to stand for 30 minutes, and then filtered through an 80-90 mesh screen to obtain the polymer emulsion; The preparation process of the cement slurry is as follows: Put Portland cement, quartz powder, heavy calcium carbonate, tap water into the mixer, 120 rpm continuous stirring for 10 min, add cellulose ether, stirring for 5 min, then add calcium formate, polycarboxylic acid, 500 rpm continuous stirring for 10 min, filter with 40-60 mesh screen, get cement paste; The preparation process of the high molecular polymer cement coating is as follows: Mix the polymer emulsion and the cement paste according to the ratio of 1:1 at the stirring speed of 60 rpm, and get the high molecular polymer cement coating after stirring for 5-10 min.