Waterproof and moisture-resistant wall surface layer material

Abstract

The invention relates to the technical field of building materials, and particularly discloses a waterproof and moisture-resistant wall surface layer material. The waterproof and moisture-resistant wall surface layer material is prepared from the following raw materials: 100 parts of a cementing material, 120 to 150 parts of quartz sand, 5 to 10 parts of silica fume, 8 to 15 parts of acrylic redispersible latex powder, 0.8 to 1.5 parts of a polycarboxylate superplasticizer, 0.2 to 0.4 part of cellulose ether, 0.3 to 0.8 part of a water repellent, 2 to 4 parts of a waterproof agent, 1 to 2.5 parts of reinforced fibers and 0.5 to 1 part of a mildew preventive. The application helps to improve the long-term waterproof performance and moisture resistance of the protective material when the protective material is applied in a basement and other long-term humid environments.

Description

Technical Field

[0001] This invention relates to the technical field of building materials, and in particular to a waterproof and moisture-resistant wall surface material. Background Technology

[0002] In the field of construction and interior decoration, dampness and water erosion are among the main causes of wall damage, decorative failure, and indoor environmental health problems. Currently, latex paints with added anti-mold agents can delay the occurrence of mold to some extent, but they cannot effectively prevent the penetration of liquid water and moisture. Once in a long-term damp environment, moisture will penetrate into the material and the substrate, causing the coating to blister, chalk, wallpaper to peel and curl, and ultimately leading to mold growth. The effect is not long-lasting or ideal.

[0003] In related technology, CN106242384A discloses a protective material for completely eliminating dampness in interior walls, comprising the following components: cement, fly ash, diatomaceous earth, heavy calcium carbonate powder, xanthan gum powder, air-entraining agent, polypropylene crack-resistant fiber, and EPS granules. The preparation method involves adding each component to a mixing device, adding water, and mixing until fully homogeneous to obtain a mixed slurry. In use, the mixed slurry is brushed onto the wall surface, and after natural drying, a protective layer is formed.

[0004] However, in damp environments such as basements, the organic components in these protective materials, such as xanthan gum powder, may be subject to biodegradation and aging, leading to a decrease in their moisture resistance after prolonged use. Furthermore, the air-entraining agent introduces air bubbles into the protective material, significantly reducing its density and compressive / flexural strength, and drastically increasing its water absorption and permeability, thus deteriorating its waterproof performance. Summary of the Invention

[0005] In order to improve the long-term waterproof and moisture-resistant properties of protective materials when used in long-term humid environments such as basements, this application provides a waterproof and moisture-resistant wall surface material.

[0006] Firstly, this application provides a waterproof and moisture-resistant wall surface material, which adopts the following technical solution:

[0007] A waterproof and moisture-resistant wall surface material comprises the following raw materials in parts by weight: 100 parts cementitious material, 120-150 parts quartz sand, 5-10 parts silica fume, 8-15 parts acrylic redispersible latex powder, 0.8-1.5 parts polycarboxylate superplasticizer, 0.2-0.4 parts cellulose ether, 0.3-0.8 parts water-repellent agent, 2-4 parts waterproofing agent, 1-2.5 parts reinforcing fiber, and 0.5-1 part mildew inhibitor.

[0008] In one specific implementation, the cementitious material comprises silicate cement and sulfoaluminate cement in a weight ratio of (6-8):3.

[0009] In one specific implementation, the reinforcing fibers comprise polypropylene fibers and basalt fibers in a weight ratio of (7.5-8.5):7.

[0010] In one specific implementation, the hydrophobic agent is a polysiloxane hydrophobic agent.

[0011] In one specific embodiment, the quartz sand comprises the following raw materials by weight percentage: 25%-35% quartz sand with a particle size of 425-850 μm, 30%-40% quartz sand with a particle size of 212-425 μm, and 25%-35% quartz sand with a particle size of 106-212 μm.

[0012] Secondly, this application provides a method for preparing a waterproof and moisture-resistant wall surface material, which adopts the following technical solution:

[0013] A method for preparing a waterproof and moisture-resistant wall surface material includes the following steps:

[0014] Quartz sand, silica fume, water-reducing agent, cellulose ether, water-repellent agent, waterproofing agent, and mildew inhibitor are mixed and stirred evenly. Then, cementitious materials, reinforcing fibers, and redispersible latex powder are added in sequence, mixed evenly, discharged, sieved, and sealed in packaging to obtain a waterproof and moisture-resistant wall surface material.

[0015] During construction, mix the waterproof and moisture-resistant wall surface material with water at a water-cement ratio of (0.2-0.25):1, let it stand for 2-3 minutes, then stir for 1-2 minutes. Apply the mixture in layers and allow it to cure naturally for 3-10 days to form a waterproof and moisture-resistant wall surface layer with a thickness of 0.2-0.4mm.

[0016] In one specific feasible implementation, the method for preparing acrylic redispersible latex powder includes the following steps:

[0017] S1. By weight, mix 30-60 parts of butyl acrylate, 40-70 parts of methyl methacrylate, 1-3 parts of acrylic acid, 1-3 parts of emulsifier and 20-30 parts of the first part of deionized water, stir evenly to obtain a pre-emulsion, and divide the pre-emulsion into a first part of pre-emulsion and a second part of pre-emulsion in a weight ratio of 1:(8-12).

[0018] S2. At 80-85℃, mix 0.3-0.8 parts of initiator, 0.2-0.5 parts of buffer, 10-15 parts of the first pre-emulsion and the second deionized water evenly to obtain seed emulsion.

[0019] S3. Keep at 80-85℃, add the second part of pre-emulsion and seed emulsion dropwise into the same reaction vessel, mix during the dropwise process, after the dropwise addition is completed, keep warm and stand for 1-2 hours, cool naturally to room temperature, adjust the pH to 7-8 with ammonia water to obtain acrylate emulsion;

[0020] S4. Under stirring, add 10-24 parts of a 20-30% polyvinyl alcohol aqueous solution and 8-15 parts of an anti-caking agent to the acrylate emulsion, mix evenly to obtain a suspension, spray dry to obtain acrylic redispersible latex powder.

[0021] In one specific implementation, the anti-caking agent is kaolin or silica.

[0022] In summary, this application has the following beneficial effects:

[0023] 1. This application, by using silicate cement, silica fume, quartz sand, acrylic redispersible latex powder, reinforcing fibers and other additives in a limited proportion, helps to improve the long-term waterproof and moisture-resistant properties of protective materials when used in long-term humid environments.

[0024] 2. In this application, the preferred materials are self-made acrylic redispersible latex powder, a mixture of silicate cement and sulfoaluminate cement in a weight ratio of (6-8):3, a mixture of polypropylene fiber and basalt fiber in a weight ratio of (7.5-8.5):7, polysiloxane water-repellent agent, and graded quartz sand, which helps to further improve the long-term waterproof performance and moisture resistance of the protective material when used in a long-term humid environment. Detailed Implementation

[0025] Unless otherwise specified, all raw materials used in this application were commercially available. The silicate cement was Jiangxi Yinsong 525 grade white silicate cement. Silica fume was purchased from Gongyi Aochuang Building Materials Co., Ltd., with a silica content of 97%. The polycarboxylate superplasticizer was QSC-polycarboxylate superplasticizer B. The methyl cellulose ether was Qingshuichi A100000 hydroxypropyl methylcellulose. The waterproofing agent was TY-18M61 organic fluorine resin copolymer waterproofing agent. The basalt fiber was Eryu STER-07. The mildew inhibitor was cerium sulfate mildew inhibitor purchased from Sichuan Wonaixi New Materials Technology Co., Ltd. The sulfoaluminate cement was Huangyunhe brand 42.5 grade low-alkalinity sulfoaluminate cement. The polypropylene fiber was Jinyi Building Materials polypropylene fiber with a fineness of 2mm and a length of 300mm. Butyl acrylate, AR grade. Methyl methacrylate, AR grade. Acrylic acid, AR grade. The emulsifier was OP-10 emulsifier. The initiator was azobisisobutyronitrile, AR grade. The buffer was SIGMA brand P3563-10PAK phosphate buffer. Kaolin was purchased from Lingshou County Zhongshi Hengda Mineral Products Processing Plant, with a particle size of 1250 mesh. Silica was purchased from Shandong Kasong New Materials Co., Ltd., with a particle size of 1250 mesh.

[0026] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0027] Example

[0028] Example 1

[0029] This embodiment provides a waterproof and moisture-resistant wall surface material, comprising the following raw materials: 100 kg of silicate cement, 135 kg of quartz sand with a particle size of 212-425 μm, 7.5 kg of silica fume, 11.5 kg of acrylic redispersible latex powder (Elaitai HD2000), 1.2 kg of polycarboxylate superplasticizer, 0.3 kg of methyl cellulose ether, 0.55 kg of potassium methyl silicate water-repellent agent (Jinyu 001), 3 kg of waterproofing agent, 1.75 kg of basalt fiber, and 0.8 kg of mildew inhibitor.

[0030] This embodiment also provides a method for preparing a waterproof and moisture-resistant wall surface material, including the following steps:

[0031] Add quartz sand to the mixer and start stirring. Then add silica fume, water-reducing agent, methyl cellulose ether, potassium methyl silicate water-repellent agent, waterproofing agent, and mildew inhibitor to the mixer and stir evenly. Add silicate cement, basalt fiber, and redispersible latex powder in sequence, stirring for 5 minutes after each addition. After all the powder has been added, continue stirring for 10 minutes until it is evenly mixed. Discharge the material, pass it through a 20-mesh sieve to remove lumps, seal and package it to obtain a waterproof and moisture-resistant wall surface material.

[0032] During construction, mix the waterproof and moisture-resistant wall surface material with water at a water-cement ratio of 0.225:1, let it stand for 2.5 minutes, then stir for another 1.5 minutes. Apply the mixture in layers and allow it to cure naturally for 7 days to form a waterproof and moisture-resistant wall surface with a total thickness of 3mm.

[0033] Example 2

[0034] The only difference between this embodiment and Embodiment 1 is that the waterproof and moisture-resistant wall surface material includes the following raw materials: 100kg of silicate cement, 120kg of quartz sand with a particle size of 212-425μm, 5kg of silica fume, 8kg of acrylic redispersible latex powder (Elaitai HD2000), 0.8kg of polycarboxylate superplasticizer, 0.2kg of methyl cellulose ether, 0.3kg of potassium methylsilicate water-repellent agent (Jinyu 001), 2kg of waterproofing agent, 1kg of basalt fiber, and 0.5kg of mildew inhibitor.

[0035] Example 3

[0036] The only difference between this embodiment and Embodiment 1 is that the waterproof and moisture-resistant wall surface material includes the following raw materials: 100kg of silicate cement, 150kg of quartz sand with a particle size of 212-425μm, 10kg of silica fume, 15kg of acrylic redispersible latex powder (Elaitai HD2000), 1.5kg of polycarboxylate superplasticizer, 0.4kg of methyl cellulose ether, 0.8kg of potassium methylsilicate water-repellent agent (Jinyu 001), 4kg of waterproofing agent, 2.5kg of basalt fiber, and 1kg of mildew inhibitor.

[0037] Example 4

[0038] The only difference between this embodiment and Embodiment 1 is that silicate cement is replaced with a mixture of silicate cement and sulfoaluminate cement in an equal weight ratio of 1:1.

[0039] Example 5

[0040] The only difference between this embodiment and Embodiment 1 is that silicate cement is replaced with a mixture of silicate cement and sulfoaluminate cement in an equal weight ratio of 2:1.

[0041] Example 6

[0042] The only difference between this embodiment and Embodiment 1 is that silicate cement is replaced with a mixture of silicate cement and sulfoaluminate cement in an equal weight ratio of 7:3.

[0043] Example 7

[0044] The only difference between this embodiment and Embodiment 1 is that the silicate cement is replaced with a mixture of silicate cement and sulfoaluminate cement in an equal weight ratio of 8:3.

[0045] Example 8

[0046] The only difference between this embodiment and Embodiment 1 is that silicate cement is replaced with a mixture of silicate cement and sulfoaluminate cement in an equal weight ratio of 3:1.

[0047] Example 9

[0048] The only difference between this embodiment and Embodiment 1 is that the basalt fiber is replaced with a mixture of polypropylene fiber and basalt fiber in an equal weight ratio of 1:1.

[0049] Example 10

[0050] The only difference between this embodiment and Embodiment 1 is that the basalt fiber is replaced with a mixture of polypropylene fiber and basalt fiber in an equal weight ratio of 7.5:7.

[0051] Example 11

[0052] The only difference between this embodiment and Embodiment 1 is that the basalt fiber is replaced with a mixture of polypropylene fiber and basalt fiber in an equal weight ratio of 8:7.

[0053] Example 12

[0054] The only difference between this embodiment and Embodiment 1 is that the basalt fiber is replaced with a mixture of polypropylene fiber and basalt fiber in an equal weight ratio of 8.5:7.

[0055] Example 13

[0056] The only difference between this embodiment and Embodiment 1 is that the basalt fiber is replaced with a mixture of polypropylene fiber and basalt fiber in an equal weight ratio of 9:7.

[0057] Example 14

[0058] The only difference between this embodiment and Embodiment 1 is that an equal amount of polysiloxane hydrophobic agent is used to replace potassium methylsilicate hydrophobic agent.

[0059] Example 15

[0060] The only difference between this embodiment and Example 1 is that the acrylic redispersible latex powder in this embodiment is prepared according to the following preparation method:

[0061] S1. Divide the deionized water into two portions. Mix 45 kg of butyl acrylate, 55 kg of methyl methacrylate, 2 kg of acrylic acid, 2 kg of emulsifier and 25 kg of the first portion of deionized water. Stir for 40 minutes until uniform to obtain a pre-emulsion. Divide the pre-emulsion into a first pre-emulsion and a second pre-emulsion at a weight ratio of 1:10.

[0062] S2. At 83℃, mix 0.55 kg of initiator, 0.35 kg of buffer, the first part of pre-emulsion and the second part of deionized water evenly to obtain seed emulsion.

[0063] S3. At 83°C, the second pre-emulsion and seed emulsion are simultaneously added dropwise to the same reactor and mixed during the addition. After the addition is complete, the mixture is kept at the temperature and allowed to stand for 1.5 hours. It is then allowed to cool naturally to room temperature. The pH is adjusted to between 7 and 8 with ammonia water to obtain the acrylate emulsion.

[0064] S4. Under stirring, 16 kg of a 25% polyvinyl alcohol aqueous solution and 11.5 kg of kaolin were added to the acrylic emulsion. The mixture was homogenized by circulation using a high-pressure homogenizer. After being mixed evenly, a suspension was obtained. Then, the suspension was spray-dried to obtain acrylic redispersible latex powder.

[0065] Example 16

[0066] The only difference between this embodiment and Example 1 is that the acrylic redispersible latex powder in this embodiment is prepared according to the following preparation method:

[0067] S1. Divide the deionized water into two portions. Mix 30 kg of butyl acrylate, 40 kg of methyl methacrylate, 1 kg of acrylic acid, 3 kg of emulsifier and 20 kg of the first portion of deionized water. Stir for 40 minutes until uniform to obtain a pre-emulsion. Divide the pre-emulsion into a first pre-emulsion and a second pre-emulsion at a weight ratio of 1:10.

[0068] S2. At 80℃, mix 0.3 kg of initiator, 0.2 kg of buffer, the first part of pre-emulsion and the second part of deionized water evenly to obtain seed emulsion.

[0069] S3. At 80°C, the second pre-emulsion and seed emulsion are simultaneously added dropwise to the same reactor and mixed during the addition process. After the addition is completed, the mixture is kept at the temperature for 2 hours and then allowed to cool naturally to room temperature. The pH is adjusted to between 7 and 8 with ammonia water to obtain the acrylate emulsion.

[0070] S4. Under stirring, 10 kg of a 20% polyvinyl alcohol aqueous solution and 8 kg of kaolin are added to the acrylic emulsion. The mixture is then homogenized using a high-pressure homogenizer and mixed evenly to obtain a suspension. Finally, the suspension is spray-dried to obtain acrylic redispersible latex powder.

[0071] Example 17

[0072] The only difference between this embodiment and Example 1 is that the acrylic redispersible latex powder in this embodiment is prepared according to the following preparation method:

[0073] S1. Divide the deionized water into two portions. Mix 60 kg of butyl acrylate, 70 kg of methyl methacrylate, 3 kg of acrylic acid, 3 kg of emulsifier and 30 kg of the first portion of deionized water. Stir for 40 minutes until uniform to obtain a pre-emulsion. Divide the pre-emulsion into a first pre-emulsion and a second pre-emulsion at a weight ratio of 1:10.

[0074] S2. At 85℃, mix 0.8 kg of initiator, 0.5 kg of buffer, the first part of pre-emulsion and the second part of deionized water evenly to obtain seed emulsion.

[0075] S3. At 85°C, the second pre-emulsion and seed emulsion are simultaneously added dropwise to the same reactor and mixed during the addition. After the addition is complete, the mixture is kept at the temperature and allowed to stand for 1 hour. It is then allowed to cool naturally to room temperature. The pH is adjusted to between 7 and 8 with ammonia water to obtain the acrylate emulsion.

[0076] S4. Under stirring, 24 kg of a 20% polyvinyl alcohol aqueous solution and 15 kg of kaolin are added to the acrylic emulsion. The mixture is then homogenized using a high-pressure homogenizer and mixed evenly to obtain a suspension. Finally, the suspension is spray-dried to obtain acrylic redispersible latex powder.

[0077] Example 18

[0078] The only difference between this embodiment and embodiment 15 is that, in step S1 of the method for preparing acrylic redispersible latex powder in this embodiment, the pre-emulsion is divided into a first pre-emulsion and a second pre-emulsion in a weight ratio of 1:6.

[0079] Example 19

[0080] The only difference between this embodiment and embodiment 15 is that, in step S1 of the method for preparing acrylic redispersible latex powder in this embodiment, the pre-emulsion is divided into a first part pre-emulsion and a second part pre-emulsion in a weight ratio of 1:8.

[0081] Example 20

[0082] The only difference between this embodiment and Embodiment 15 is that, in step S1 of the method for preparing acrylic redispersible latex powder in this embodiment, the pre-emulsion is divided into a first pre-emulsion and a second pre-emulsion at a weight ratio of 1:12.

[0083] Example 21

[0084] The only difference between this embodiment and Embodiment 15 is that, in step S1 of the method for preparing acrylic redispersible latex powder in this embodiment, the pre-emulsion is divided into a first pre-emulsion and a second pre-emulsion at a weight ratio of 1:14.

[0085] Example 22

[0086] The only difference between this embodiment and Embodiment 15 is that, in step S4 of the method for preparing acrylic redispersible latex powder in this embodiment, an equal amount of silica is used to replace kaolin.

[0087] Example 23

[0088] The only difference between this embodiment and Example 1 is that an equal amount of graded silica sand is used to replace the silica sand with a particle size of 212-425 μm. The graded silica sand comprises the following raw materials by weight percentage: 30% silica sand with a particle size of 425-850 μm, 35% silica sand with a particle size of 212-425 μm, and 35% silica sand with a particle size of 106-212 μm.

[0089] Example 24

[0090] The only difference between this embodiment and Example 1 is that an equal amount of graded silica sand is used to replace the silica sand with a particle size of 212-425 μm. The graded silica sand comprises the following raw materials by weight percentage: 25% silica sand with a particle size of 425-850 μm, 40% silica sand with a particle size of 212-425 μm, and 35% silica sand with a particle size of 106-212 μm.

[0091] Example 25

[0092] The only difference between this embodiment and Example 1 is that an equal amount of graded quartz sand with a particle size of 212-425 μm is replaced. The graded quartz sand comprises the following raw materials by weight percentage: 35% quartz sand with a particle size of 425-850 μm, 35% quartz sand with a particle size of 212-425 μm, and 30% quartz sand with a particle size of 106-212 μm.

[0093] Example 26

[0094] The only difference between this embodiment and Example 1 is that an equal amount of graded quartz sand with a particle size of 212-425 μm is replaced. The graded quartz sand comprises the following raw materials by weight percentage: 35% quartz sand with a particle size of 425-850 μm, 30% quartz sand with a particle size of 212-425 μm, and 35% quartz sand with a particle size of 106-212 μm.

[0095] Example 27

[0096] This embodiment provides a waterproof and moisture-resistant wall surface material, comprising the following raw materials: 100 kg of a mixture of silicate cement and sulfoaluminate cement in a weight ratio of 7:3, 135 kg of graded quartz sand, 7.5 kg of silica fume, 11.5 kg of acrylic redispersible latex powder, 1.2 kg of polycarboxylate superplasticizer, 0.3 kg of methyl cellulose ether, 0.55 kg of polysiloxane water-repellent agent, 3 kg of waterproofing agent, 1.75 kg of a mixture of polypropylene fiber and basalt fiber in a weight ratio of 8:7, and 0.8 kg of mildew inhibitor.

[0097] Graded quartz sand comprises the following raw materials by weight percentage: 30% quartz sand with a particle size of 425-850μm, 35% quartz sand with a particle size of 212-425μm, and 35% quartz sand with a particle size of 106-212μm.

[0098] Acrylic redispersible latex powder is prepared according to the following method:

[0099] S1. Divide the deionized water into two portions. Mix 45 kg of butyl acrylate, 55 kg of methyl methacrylate, 2 kg of acrylic acid, 2 kg of emulsifier and 25 kg of the first portion of deionized water. Stir for 40 minutes until uniform to obtain a pre-emulsion. Divide the pre-emulsion into a first pre-emulsion and a second pre-emulsion at a weight ratio of 1:10.

[0100] S2. At 83℃, mix 0.55 kg of initiator, 0.35 kg of buffer, the first part of pre-emulsion and the second part of deionized water evenly to obtain seed emulsion.

[0101] S3. At 83°C, the second pre-emulsion and seed emulsion are simultaneously added dropwise to the same reactor and mixed during the addition. After the addition is complete, the mixture is kept at the temperature and allowed to stand for 1.5 hours. It is then allowed to cool naturally to room temperature. The pH is adjusted to between 7 and 8 with ammonia water to obtain the acrylate emulsion.

[0102] S4. Under stirring, 16 kg of a 25% polyvinyl alcohol aqueous solution and 11.5 kg of kaolin were added to the acrylic emulsion. The mixture was homogenized by circulation using a high-pressure homogenizer. After being mixed evenly, a suspension was obtained. Then, the suspension was spray-dried to obtain acrylic redispersible latex powder.

[0103] This embodiment also provides a method for preparing a waterproof and moisture-resistant wall surface material, including the following steps:

[0104] Add quartz sand to the mixer and start stirring. Then add silica fume, water-reducing agent, methyl cellulose ether, potassium methyl silicate water-repellent agent, waterproofing agent, and mildew inhibitor to the mixer and stir evenly. Add silicate cement, basalt fiber, and redispersible latex powder in sequence, stirring for 5 minutes after each addition. After all the powder has been added, continue stirring for 10 minutes until it is evenly mixed. Discharge the material, pass it through a 20-mesh sieve to remove lumps, seal and package it to obtain a waterproof and moisture-resistant wall surface material.

[0105] During construction, mix the waterproof and moisture-resistant wall surface material with water at a water-cement ratio of 0.225:1, let it stand for 2.5 minutes, then stir for another 1.5 minutes. Apply the mixture in layers and allow it to cure naturally for 7 days to form a waterproof and moisture-resistant wall surface with a total thickness of 3mm.

[0106] Example 28

[0107] The only difference between this embodiment and Embodiment 1 is that, in the preparation method of the waterproof and moisture-resistant wall surface material, during construction, the waterproof and moisture-resistant wall surface material is mixed with water at a water-cement ratio of 0.2:1, left to stand for 2 minutes, stirred for another 1 minute, applied in layers, and naturally cured for 3 days to form a waterproof and moisture-resistant wall surface layer with a total thickness of 2mm.

[0108] Example 29

[0109] The only difference between this embodiment and Embodiment 1 is that, in the preparation method of the waterproof and moisture-resistant wall surface material, during construction, the waterproof and moisture-resistant wall surface material is mixed with water at a water-cement ratio of 0.25:1, left to stand for 3 minutes, then stirred for 2 minutes, applied in layers, and naturally cured for 10 days to form a waterproof and moisture-resistant wall surface layer with a total thickness of 4mm.

[0110] Comparative Example

[0111] Comparative Example 1

[0112] The only difference between this comparative example and Example 1 is that, in the raw materials and preparation method of the waterproof and moisture-resistant wall surface material, an equal amount of silicate cement is used to replace silica fume.

[0113] Comparative Example 2

[0114] The only difference between this comparative example and Example 1 is that, in the raw materials and preparation method of the waterproof and moisture-resistant wall surface material, an equal amount of silicate cement is used to replace the acrylic redispersible latex powder.

[0115] Comparative Example 3

[0116] The only difference between this comparative example and Example 1 is that, in the raw materials and preparation method of the waterproof and moisture-resistant wall surface material, an equal amount of silicate cement is used to replace the quartz sand with a particle size of 212-425μm.

[0117] Comparative Example 4

[0118] The only difference between this comparative example and Example 1 is that, in the raw materials and preparation method of the waterproof and moisture-resistant wall surface material, an equal amount of silicate cement is used to replace basalt fiber.

[0119] Performance testing

[0120] The following performance tests were conducted on Examples 1-29 and Comparative Examples 1-4:

[0121] According to the schemes of each embodiment and comparative example, a truncated cone-shaped specimen with an upper diameter of 70 mm, a lower diameter of 80 mm, and a height of 30 mm was made.

[0122] The capillary water absorption coefficient was tested according to EN1015-18: The specimen was dried to constant weight at 50°C, cooled, and then placed upright in a shallow water dish with a water depth of 5 mm. After standing for 720 hours, the specimen was weighed and the increase in mass was recorded. The capillary water absorption coefficient was calculated, which is the amount of water absorbed per unit area per unit time (kg / m²). 2 ·h 0.5 ).

[0123] According to JC / T984-2011, the wet-dry cycle performance test was conducted: the specimen was subjected to 50 "immersion-drying" cycles, each cycle consisting of immersion in a saturated Ca(OH)2 solution for 18 hours, followed by drying in a 70℃ oven for 6 hours. After the cycle, its impermeability pressure was tested and compared with that of a specimen that had not undergone the cycle. The impermeability pressure retention rate was calculated as follows: impermeability pressure retention rate = (impermeability pressure after cycle ÷ impermeability pressure before cycle) × 100%.

[0124] The test results are shown in Table 1.

[0125] Table 1

[0126]

[0127] Based on Example 1 and Comparative Examples 1-4, and referring to Table 1, it can be seen that compared to Example 1, the capillary water absorption coefficients of Comparative Examples 1-5 are significantly increased, and all are greater than 0.5 kg / m³. 2 ·h 0.5 The impermeability pressure retention rates of Comparative Examples 1-5 were significantly lower, all less than 80%. This indicates that using the raw material ratio and preparation method of Example 1 helps to improve the long-term waterproof and moisture-resistant properties of the protective material when used in a long-term humid environment.

[0128] This is likely because silicate cement, as a cementing material, improves the long-term strength and stability of the wall surface layer. Quartz sand fills the millimeter- to micrometer-sized voids, while silica fume fills the nanometer- and micrometer-sized voids between cement particles. The combination of quartz sand, silica fume, and silicate cement forms a three-tiered filling, increasing the density of the surface layer, reducing porosity, and helping to prevent water molecule penetration. Acrylic redispersible latex powder, after film formation, forms a tough polymer network that permeates the cement hydration products, reducing the material's elastic modulus, increasing adhesion strength and cohesion to the substrate, and blocking remaining micropores. Reinforcing fibers inhibit crack formation. Therefore, acrylic redispersible latex powder improves the toughness of the "surface," while reinforcing fibers improve the strength of the "lines," together forming a three-dimensional crack-resistant network that improves the strength and toughness of the wall surface layer, reduces crack formation during long-term use, and improves long-term waterproofing and moisture resistance. Furthermore, the water-repellent agent forms a permanent water-repellent film on the inner wall of the capillaries, keeping water out. Even if a small amount of water breaches the hydrophobic layer, the waterproofing agent can react with the cement hydration product Ca(OH)2 and water to form water-insoluble needle-like crystals, which block capillaries and microcracks, automatically sealing the seepage path and achieving self-repair. Under the raw material ratio in Example 1, the raw materials work synergistically to improve the long-term waterproofing and moisture resistance of the protective material when used in a long-term humid environment.

[0129] As can be seen from Examples 1-29 and Table 1, the capillary water absorption coefficients of Examples 1-29 are all less than 0.5 kg / m³. 2 ·h 0.5 The impermeability pressure retention rate is greater than 80%. This indicates that the raw material ratios and preparation methods within the range of Examples 1-29 can all improve the long-term waterproof performance and moisture resistance of the protective material when used in a long-term humid environment.

[0130] Furthermore, by comparing the test data of Examples 1-29, it can be seen that using self-made acrylic redispersible latex powder, a mixture of silicate cement and sulfoaluminate cement in a weight ratio of (6-8):3, a mixture of polypropylene fiber and basalt fiber in a weight ratio of (7.5-8.5):7, polysiloxane water-repellent agent, and graded quartz sand helps to further improve the long-term waterproof performance and moisture resistance of the protective material when used in a long-term humid environment.

[0131] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A waterproof and moisture resistant wall finish material, characterized by, The waterproof and moisture-resistant wall surface layer material comprises the following raw materials in parts by weight: cementing material 100 parts, quartz sand 120-150 parts, silica fume 5-10 parts, acrylic redispersible latex powder 8-15 parts, polycarboxylic acid water reducing agent 0.8-1.5 parts, cellulose ether 0.2-0.4 parts, hydrophobic agent 0.3-0.8 parts, waterproof agent 2-4 parts, reinforcing fiber 1-2.5 parts, and mildew-proof agent 0.5-1 part.

2. A waterproof and moisture resistant wall cladding material according to claim 1, characterised in that, The cementing material comprises silicate cement and sulphoaluminate cement in a weight ratio of (6-8):

3.

3. A water-resistant moisture-tolerant wall covering material according to claim 2, wherein The reinforcing fiber comprises polypropylene fiber and basalt fiber in a weight ratio of (7.5-8.5):

7.

4. The waterproof and moisture resistant wall covering material of claim 1, wherein, The hydrophobic agent is a polysiloxane hydrophobic agent.

5. The waterproof and moisture resistant wall covering material of claim 1, wherein, The quartz sand comprises the following raw materials in percentage by weight: quartz sand with a particle size of 425-850 μm 25%-35%, quartz sand with a particle size of 212-425 μm 30%-40%, and quartz sand with a particle size of 106-212 μm 25%-35%.

6. A method of producing a water repellent and moisture resistant wall covering material as claimed in any one of claims 1-5, characterized in that The method comprises the following steps: The quartz sand, silica fume, water reducing agent, cellulose ether, hydrophobic agent, waterproof agent and mildew-proof agent are mixed and stirred uniformly, and then the cementing material, reinforcing fiber and redispersible latex powder are added in sequence, mixed uniformly, discharged, sieved, sealed and packaged to obtain the waterproof and moisture-resistant wall surface layer material. During construction, the waterproof and moisture-resistant wall surface layer material is mixed with water uniformly according to a water-cement ratio (0.2-0.25):1, and then is left to stand for 2-3 min, stirred for 1-2 min again, applied by layering and scraping, and naturally cured for 3-10 days to form a waterproof and moisture-resistant wall surface layer with a thickness of 0.2-0.4 mm.

7. The method of claim 6, wherein the water-resistant and moisture-tolerant wall surface material is prepared by mixing the water-resistant and moisture-tolerant wall surface material composition with water in a ratio of 1 : 1 to 1 :

3. The preparation method of the acrylic redispersible latex powder comprises the following steps: S1, the butyl acrylate 30-60 parts, methyl methacrylate 40-70 parts, acrylic acid 1-3 parts, emulsifier 1-3 parts and the first part of deionized water 20-30 parts are mixed, stirred uniformly, and the pre-emulsion is obtained, and the pre-emulsion is divided into the first pre-emulsion and the second pre-emulsion according to the weight ratio of 1:(8-12); S2, the initiator 0.3-0.8 parts, the buffer 0.2-0.5 parts, the first pre-emulsion and the second deionized water 10-15 parts are mixed uniformly at 80-85 DEG C to obtain the seed emulsion; S3, the second pre-emulsion and the seed emulsion are added dropwise into the same reaction kettle under 80-85 DEG C, mixed during the dropping process, and then left to stand for 1-2 h after the dropping is completed, and naturally cooled to room temperature, and the pH is adjusted to 7-8 with ammonia water to obtain the acrylate emulsion; S4, the polyvinyl alcohol aqueous solution with a mass concentration of 20-30% 10-24 parts and the anti-caking agent 8-15 parts are added into the acrylate emulsion under stirring, mixed uniformly to obtain the suspension, and then spray dried to obtain the acrylic redispersible latex powder.

8. The method of claim 7, wherein the water-resistant and moisture-tolerant wall surface material is prepared by mixing the water-resistant and moisture-tolerant wall surface material with water in a ratio of 1 : 1 to 1 :

3. The anti-caking agent is kaolin or silicon dioxide.

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