Polymer self-repairing waterproof coating and use method thereof

Abstract

The invention discloses a polymer self-repairing waterproof paint and a use method thereof, and relates to the technical field of waterproof paints.The polymer self-repairing waterproof paint is prepared from cement, carbonized waste aerated building blocks, carbonized copper slag, modified montmorillonite, polymer emulsion, a dispersing agent, a defoaming agent and a flatting agent as main ingredients, and aragonite whiskers dispersed in the carbonized waste aerated building blocks are used for improving the strength of the waterproof paint; silica gel generated by carbonization reacts with cement to generate calcium hydroxide to generate C-S-H with a low calcium-silicon ratio, so that the corrosion resistance and the impermeability of the coating are improved; the carbonized copper slag is doped into the waterproof coating, so that the wear resistance of the waterproof coating is improved, copper ions can achieve an antibacterial effect, silica gel generated after carbonization has relatively high activity, and the cement consumption is further reduced; on one hand, carbon sequestration is realized, and on the other hand, the carbonized waste aerated building blocks and active substances in the copper slag are utilized, so that the strength performance, corrosion resistance, impermeability and wear resistance of the coating are improved, the cement consumption is reduced, and the building material utilization rate of the coating is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waterproof coating, in particular to a polymer self-repairing waterproof coating and a use method thereof. BACKGROUND

[0002] Coating is a coating material that can provide protection and decoration functions, and is widely used in many fields such as industrial manufacturing, building construction, and even daily life. However, under the influence of a specific environment, fine cracks that are difficult to detect with the naked eye will appear on the surface of the coating. With the passage of time, these cracks will continue to expand as they are in contact with air, moisture and other substances for a long time, eventually causing the coating to peel off from the surface of the substrate, greatly shortening the effective protection period of the coating. In order to improve the service life of the coating, the common method is to add various additives, but this method not only has high cost, but also has unsatisfactory actual protection effect.

[0003] In building construction, due to the cutting, handling and other operations of aerated blocks, some leftover materials and damaged blocks will inevitably be produced. According to statistics, the waste production rate of aerated blocks in building construction is about 5%-10%. With the continuous development of urban construction, a large amount of waste aerated blocks is produced during the demolition and reconstruction of old buildings. Some unqualified products produced during the production of aerated blocks will also become waste aerated blocks. Waste aerated blocks are large in size and difficult to degrade naturally. If they are randomly stacked, a large amount of land resources will be occupied. According to estimates, about 5-8 mu of land is needed for every 10,000 tons of waste aerated blocks. During the long-term stacking process, some harmful substances may seep out due to the action of rainwater, causing pollution to the soil and groundwater. At the same time, the random stacking of waste aerated blocks will also affect the urban environment and cause visual pollution. If not reasonably utilized, it will be a waste of resources.

[0004] With the continuous increase of copper production in China, the discharge amount of copper slag is also increasing. According to statistics, the annual discharge amount of copper slag in China exceeds 10 million tons and shows an increasing trend year by year. Copper slag yards will produce dust under the action of wind, and these dusts contain heavy metals and other harmful substances, which will pollute the atmospheric environment and affect the quality of life of the surrounding residents.

[0005] Patent CN104087141A discloses a preparation method of an organic montmorillonite / polyurethane self-repairing coating. The invention further increases the interlayer spacing of modified montmorillonite by intercalation treatment based on the organic modification of montmorillonite. The required time is relatively long, and the process is relatively complex. However, the modified montmorillonite used in the present application only needs to mix montmorillonite and sodium bicarbonate in a ratio of 6:4 and wet grind for 30 minutes, and the process is simpler.

[0006] Patent CN115232558A discloses a kind of self-repairing waterproof coating and its preparation method, using modified siloxane, modified SiO2, curing agent, surfactant and solvent etc.Material preparation, the self-repairing waterproof coating can be repaired by heating after breakage, and the raw materials of the present application include waste aerated block and copper residue and other solid waste, which greatly reduces the production cost, and the coating prepared by the present application can be repaired by heating during use, and the large-capacity absorption of sodium bicarbonate can be carbonated with carbonized waste aerated block to generate calcium carbonate and silica gel, to fill the pores and cracks, and to achieve self-repairing effect, without the need for additional repair methods such as heating, greatly reducing labor costs. SUMMARY

[0007] The first object of the present application is to provide a polymer self-repairing waterproof coating, which comprises cement, carbonized waste aerated block, carbonized copper residue, modified montmorillonite, polymer emulsion, dispersant, defoamer and leveling agent as main components. The aragonite whiskers dispersed in the carbonized waste aerated block can enhance the strength of the waterproof coating, and the carbonized copper residue can enhance the wear resistance of the waterproof coating. The silica gel generated by the carbonized copper residue has high activity, effectively reducing the amount of cement used. The second object of the present application is to provide a method for using the polymer self-repairing waterproof coating, which adopts a layer-by-layer coating construction method to form a temperature-responsive interpenetrating network structure.

[0008] Further, a polymer self-repairing waterproof coating comprises the following components by weight: cement 15-30 parts, carbonized waste aerated block 10-20 parts, carbonized copper residue 6-12 parts, modified montmorillonite 7.5-15 parts, polymer emulsion 35-50 parts, dispersant 1.5-2.6 parts, defoamer 0.08-0.2 parts, and leveling agent 0.1-1.4 parts.

[0009] Further, the cement is ordinary portland cement, P.O.42.5; Further, the carbonized waste aerated block is obtained by crushing and sieving the waste aerated block, with a sieve size of 1.6 mm, wet grinding for 1 h at a water-cement ratio of 10:1-5:1, and then carbonizing the obtained slurry at 60-80°C for 4-5 hours with a CO2 flow rate of 0.1-0.5 L / min to obtain the carbonized waste aerated block.

[0010] Further, the modified montmorillonite is obtained by mixing montmorillonite with sodium bicarbonate at a ratio of 6:4 and wet grinding for 30 min to obtain the modified montmorillonite.

[0011] Further, the copper carbonization slag is obtained by grinding the copper slag by a grinding machine for 1h, wet grinding according to a water-cement ratio of 10:1-5:1 for 1h, and then continuously carbonizing the obtained slurry at 60-80 DEG C, with a CO2 flow rate of 0.1-0.5 L / min, and a carbonization time of 5-9 hours.

[0012] Further, the polymer emulsion (fluorocarbon emulsion: styrene-acrylate emulsion ratio = 20:80 / 50:50 / 80:20) is named as high styrene-acrylate (polymer) emulsion (fluorocarbon: styrene-acrylate = 20:80) and spray mixed emulsion (fluorocarbon: styrene-acrylate = 50:50) and high fluorocarbon emulsion (fluorocarbon: styrene-acrylate = 80:20) according to the different ratios of fluorocarbon emulsion and styrene-acrylate emulsion.

[0013] Further, the dispersant is polycarboxylic acid, the defoaming agent is silicone defoaming agent, and the leveling agent is hydroxyethyl cellulose.

[0014] A use method of the above polymer self-repairing waterproof coating, comprising the following steps: S1, polymer self-repairing waterproof coating preparation: cement 15-30 parts, carbonized waste aerated block 10-20 parts, carbonized copper slag 6-12 parts, modified montmorillonite 7.5-15 parts, polymer emulsion 35-50 parts, dispersant 1.5-2.6 parts, defoaming agent 0.08-0.2 parts, leveling agent 0.1-1.4 parts, and mixing and stirring uniformly to obtain the polymer self-repairing waterproof coating; S2, base layer coating: spraying high styrene-acrylate (polymer) emulsion ratio slurry (fluorocarbon: styrene-acrylate = 20:80), and standing for 5 minutes to volatilize part of water; S3, middle layer coating: when the base layer is in a semi-dry state, spraying mixed slurry (fluorocarbon: styrene-acrylate = 50:50), and utilizing capillary action to promote the low Tg styrene-acrylate emulsion to float up; S4, surface layer coating: after the middle layer is surface dried, spraying high fluorocarbon emulsion ratio slurry (fluorocarbon: styrene-acrylate = 80:20); S5, curing: hot air curing at 60 DEG C for 2 hours, and the polymer chains in different layers penetrate and crosslink with each other.

[0015] Compared with the prior art, the present application has the following beneficial effects: (1) The present application can induce the generation of aragonite whiskers by utilizing the small amount of magnesium elements in the waste aerated concrete block during carbonization, thereby improving the crack resistance of waterproof coating, and the aragonite whiskers after carbonization can be dispersed by wet grinding, thereby playing a dispersion strengthening effect and improving the strength of the waterproof coating, and solving the problem of agglomeration of aragonite whiskers in the existing carbonization process; (2) The present application can generate silica gel during the carbonization process of the waste aerated concrete block, and the silica gel reacts with cement to generate low calcium-silicon ratio C-S-H, thereby improving the corrosion resistance of the coating and further improving the impermeability of the coating; (3) The present application can improve the wear resistance of the waterproof coating by wet grinding and carbonizing the copper slag, and the dissolved copper ions can play a bacteriostatic effect, and the silica gel generated after carbonization has high activity, thereby significantly reducing the cement dosage; (4) The present application can reduce the structure layer number of montmorillonite by mixing montmorillonite with sodium bicarbonate and wet grinding for 30 minutes, and can expand the interlayer spacing of montmorillonite to realize large-capacity adsorption of sodium bicarbonate, and when aging cracking or water seepage occurs during the use of the coating, the large-capacity adsorbed sodium bicarbonate can react with the carbonated waste aerated concrete block to generate calcium carbonate and silica gel, thereby filling the pores and cracks and self-repairing, and the modified montmorillonite has a lamellar structure, thereby avoiding the aging of the coating caused by ultraviolet rays; (5) The present application adopts a layer-by-layer coating construction method to form a temperature-responsive interpenetrating network structure, the high benzene propylene polymer in the low temperature zone provides rigid support, and the high fluorocarbon polymer in the high temperature zone enhances the deformation ability, thereby realizing dynamic adaptation to the thermal expansion and cold contraction of the substrate and solving the cracking problem of traditional coatings caused by temperature changes. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A schematic diagram of the self-repairing waterproof coating of the present application. DETAILED DESCRIPTION

[0017] The technical solutions provided by the present application will be further described below in combination with the drawings and according to the specific embodiments and examples.

[0018] Preparation of carbonized waste aerated concrete block: The waste aerated concrete block is crushed and sieved, the sieve size is 1.6 mm, wet grinding is carried out for 1 h according to the water-cement ratio of 5:1, the obtained slurry is continuously carbonized at 80 DEG C, the CO2 flow rate is 0.3 L / min, and the carbonization time is 5 hours, thereby obtaining the carbonized waste aerated concrete block.

[0019] Preparation of carbonized copper slag: The copper slag is ground by a pulverizer for 1 h, wet grinding is carried out for 1 h according to the water-cement ratio of 5:1, the obtained slurry is continuously carbonized at 80 DEG C, the CO2 flow rate is 0.3 L / min, and the carbonization time is 9 hours, thereby obtaining the carbonized copper slag.

[0020] Preparation of modified montmorillonite: The montmorillonite and sodium bicarbonate are mixed according to the ratio of 6:4 and wet grinding is carried out for 30 min, thereby obtaining the modified montmorillonite.

[0021] Polymer emulsion configuration: polymer emulsion A-high styrene-acrylic (polymer) emulsion (fluorocarbon: styrene-acrylic = 20:80), polymer emulsion B-mixed emulsion (fluorocarbon: styrene-acrylic = 50:50), polymer emulsion C-high fluorocarbon emulsion (fluorocarbon: styrene-acrylic = 80:20).

[0022] Example 1

[0023] As shown in Figure 1 S1 polymer self-repairing waterproof coating configuration: by mass fraction, cement 15 parts, carbonized waste aerated block 10 parts, carbonized copper slag 6 parts, modified montmorillonite soil 7.5 parts, polymer emulsion A 35 parts, dispersing agent 1.5 parts, defoaming agent 0.08 parts, leveling agent 0.1 parts, mixed and stirred uniformly to obtain polymer self-repairing waterproof coating A; S2 polymer self-repairing waterproof coating configuration: by mass fraction, cement 15 parts, carbonized waste aerated block 10 parts, carbonized copper slag 6 parts, modified montmorillonite soil 7.5 parts, polymer emulsion B 35 parts, dispersing agent 1.5 parts, defoaming agent 0.08 parts, leveling agent 0.1 parts, mixed and stirred uniformly to obtain polymer self-repairing waterproof coating B; S3 polymer self-repairing waterproof coating configuration: by mass fraction, cement 15 parts, carbonized waste aerated block 10 parts, carbonized copper slag 6 parts, modified montmorillonite soil 7.5 parts, polymer emulsion C 35 parts, dispersing agent 1.5 parts, defoaming agent 0.08 parts, leveling agent 0.1 parts, mixed and stirred uniformly to obtain polymer self-repairing waterproof coating C; S4 primer coating: spray the polymer self-repairing waterproof coating A prepared in S1, and let stand for 5 minutes to volatilize part of the water; S5 intermediate layer coating: spray the polymer self-repairing waterproof coating B prepared in S2 when the primer is semi-dry; S6 surface layer coating: after the intermediate layer is surface-dry, spray the polymer self-repairing waterproof coating C prepared in S3; Comparative Example 1 S1 polymer self-repairing waterproof coating configuration: by mass fraction, cement 20 parts, carbonized waste aerated block 13 parts, carbonized copper slag 8 parts, modified montmorillonite soil 10 parts, polymer emulsion A 40 parts, dispersing agent 1.8 parts, defoaming agent 0.12 parts, leveling agent 0.5 parts, mixed and stirred uniformly to obtain polymer self-repairing waterproof coating A; S2 polymer self-repairing waterproof coating configuration: by mass fraction, cement 20 parts, carbonized waste aerated block 13 parts, carbonized copper slag 8 parts, modified montmorillonite soil 10 parts, polymer emulsion B 40 parts, dispersing agent 1.8 parts, defoaming agent 0.12 parts, leveling agent 0.5 parts, mixed and stirred uniformly to obtain polymer self-repairing waterproof coating A; S3 Polymer Self-Healing Waterproof Coating Preparation: By weight, 20 parts cement, 13 parts carbonized waste aerated concrete blocks, 8 parts carbonized copper slag, 10 parts modified montmorillonite, 40 parts polymer emulsion C, 1.8 parts dispersant, 0.12 parts defoamer, and 0.5 parts leveling agent are mixed and stirred evenly to obtain polymer self-healing waterproof coating A. S4 Undercoat: Spray the polymer self-healing waterproof coating A prepared by S1, and let it stand for 5 minutes to allow some of the moisture to evaporate; S5 Intermediate Layer Coating: When the bottom layer is in a semi-dry state, spray the polymer self-healing waterproof coating B prepared by S2; S6 Surface Coating: After the intermediate layer is surface dry, spray the polymer self-healing waterproof coating C prepared by S3; Comparative Example 2: S1 Polymer Self-Healing Waterproof Coating Preparation: By weight, 25 parts cement, 16 parts carbonized waste aerated concrete blocks, 10 parts carbonized copper slag, 12.5 parts modified montmorillonite, 45 parts polymer emulsion A, 2.2 parts dispersant, 0.16 parts defoamer, and 0.9 parts leveling agent are mixed and stirred evenly to obtain polymer self-healing waterproof coating A. S2 Polymer Self-Healing Waterproof Coating Preparation: By weight, 25 parts cement, 16 parts carbonized waste aerated concrete blocks, 10 parts carbonized copper slag, 12.5 parts modified montmorillonite, 45 parts polymer emulsion B, 2.2 parts dispersant, 0.16 parts defoamer, and 0.9 parts leveling agent are mixed and stirred evenly to obtain polymer self-healing waterproof coating A. S3 Polymer Self-Healing Waterproof Coating Preparation: By weight, 25 parts cement, 16 parts carbonized waste aerated concrete blocks, 10 parts carbonized copper slag, 12.5 parts modified montmorillonite, 45 parts polymer emulsion C, 2.2 parts dispersant, 0.16 parts defoamer, and 0.9 parts leveling agent are mixed and stirred evenly to obtain polymer self-healing waterproof coating A. S4 Undercoat: Spray the polymer self-healing waterproof coating A prepared by S1, and let it stand for 5 minutes to allow some of the moisture to evaporate; S5 Intermediate Layer Coating: When the bottom layer is in a semi-dry state, spray the polymer self-healing waterproof coating B prepared by S2; S6 Surface Coating: After the intermediate layer is surface dry, spray the polymer self-healing waterproof coating C prepared by S3; Comparative Example 3: S1 Polymer Self-Healing Waterproof Coating Preparation: By weight, 30 parts cement, 20 parts carbonized waste aerated concrete blocks, 12 parts carbonized copper slag, 15 parts modified montmorillonite, 50 parts polymer emulsion A, 2.6 parts dispersant, 0.2 parts defoamer, and 1.4 parts leveling agent are mixed and stirred evenly to obtain polymer self-healing waterproof coating A. S2 Polymer Self-Healing Waterproof Coating Preparation: By weight, 30 parts cement, 20 parts carbonized waste aerated concrete blocks, 12 parts carbonized copper slag, 15 parts modified montmorillonite, 50 parts polymer emulsion B, 2.6 parts dispersant, 0.2 parts defoamer, and 1.4 parts leveling agent are mixed and stirred evenly to obtain polymer self-healing waterproof coating A. S3 Polymer Self-Healing Waterproof Coating Preparation: By weight, 30 parts cement, 20 parts carbonized waste aerated concrete blocks, 12 parts carbonized copper slag, 15 parts modified montmorillonite, 50 parts polymer emulsion C, 2.6 parts dispersant, 0.2 parts defoamer, and 1.4 parts leveling agent are mixed and stirred evenly to obtain polymer self-healing waterproof coating A. S4 Undercoat: Spray the polymer self-healing waterproof coating A prepared by S1, and let it stand for 5 minutes to allow some of the moisture to evaporate; S5 Intermediate Layer Coating: When the bottom layer is in a semi-dry state, spray the polymer self-healing waterproof coating B prepared by S2; S6 Surface Coating: After the intermediate layer is surface dry, spray the polymer self-healing waterproof coating C prepared by S3; Table 1 shows the tensile strength parameters of the polymer self-healing waterproof coatings in the examples.

[0024] Table 2 shows the elongation at break parameters of the polymer self-healing waterproof coatings in the examples.

[0025] Table 3 shows the self-healing performance parameters of the polymer self-healing waterproof coatings in the examples.

[0026] Table 4 shows the results of the impermeability parameters of the polymer self-healing waterproof coating in the examples.

[0027] Table 5 shows the abrasion resistance parameters of the polymer self-healing waterproof coatings in the examples.

[0028] In Examples 1, Comparative Examples 1, 2, and 3, the weights of cement, carbonized waste aerated concrete blocks, carbonized copper slag, modified montmorillonite, polymer emulsion A, dispersant, defoamer, and leveling agent were progressively increased.

[0029] As can be seen from Tables 1-5: 1. The tensile strength without treatment gradually increases, reaching a peak in Comparative Example 2, and then begins to decrease; 2. During heat treatment, the retention rate and tensile strength gradually increase, reaching a peak in Comparative Example 2, and then begin to decrease. 3. The retention rate gradually increases during alkali treatment; 4. The tensile strength gradually increases during alkali treatment, reaching a peak in Comparative Example 2, and then begins to decrease. 5. The retention rate gradually increases during immersion treatment; 6. The tensile strength gradually increases during immersion treatment, reaching a peak in Comparative Example 2, and then begins to decrease. 7. The elongation at break gradually increases without treatment; 8. The retention rate of elongation at break gradually increases during heat treatment; 9. The retention rate of elongation at break gradually increased during alkali treatment, reaching a peak at Comparative Example 2, and then began to decrease. 10. The retention rate of elongation at break gradually increases during immersion treatment; 11. All self-healing properties involve crack healing; 12. Healing time gradually decreases; 13. The impermeability gradually increases; 14. At 0.3 MPa, the impermeability requirement time gradually increases; 15. At 0.4 MPa, the impermeability requirement gradually increases over time, reaching a peak at Comparative Example 2, and then begins to decrease. 16. At 0.5 MPa, the impermeability requirement gradually increases over time, reaching a peak at Comparative Example 2, and then begins to decrease. 17. The wear resistance performance quality loss rate gradually decreases.

Claims

1. A polymer self-healing waterproof coating, characterized in that, The product contains the following components by weight: 15-30 parts cement, 10-20 parts carbonized waste aerated concrete blocks, 6-12 parts carbonized copper slag, 7.5-15 parts modified montmorillonite, 35-50 parts polymer emulsion, 1.5-2.6 parts dispersant, 0.08-0.2 parts defoamer, and 0.1-1.4 parts leveling agent.

2. The polymer self-healing waterproof coating according to claim 1, characterized in that, The cement mentioned is ordinary Portland cement, PO42.

5.

3. The polymer self-healing waterproof coating according to claim 1, characterized in that, The carbonized waste aerated concrete blocks are obtained by crushing and sieving waste aerated concrete blocks with a sieve size of 1.6mm, wet grinding at a water-cement ratio of 10:1-5:1 for 1 hour, and then carbonizing the resulting slurry at 60℃-80℃ with a CO2 introduction rate of 0.1-0.5L / min for 4-5 hours to obtain carbonized waste aerated concrete blocks.

4. The polymer self-healing waterproof coating according to claim 1, characterized in that, The modified montmorillonite is obtained by wet grinding a mixture of montmorillonite and sodium bicarbonate in a ratio of 6:4 for 30 minutes.

5. The polymer self-healing waterproof coating according to claim 1, characterized in that, The copper slag is obtained by grinding copper slag in a pulverizer for 1 hour, wet grinding it for 1 hour at a water-cement ratio of 10:1-5:1, and then carbonizing the resulting slurry at 60℃-80℃. The CO2 is introduced at a rate of 0.1-0.5 L / min and the carbonization time is 5-9 hours.

6. The polymer self-healing waterproof coating according to claim 1, characterized in that, The polymer emulsions (fluorocarbon emulsion: styrene-acrylic emulsion ratio = 20:80 / 50:50 / 80:20) are named high styrene-acrylic (polymer) emulsion (fluorocarbon: styrene-acrylic = 20:80), spray-mixed emulsion (fluorocarbon: styrene-acrylic = 50:50), and high fluorocarbon emulsion (fluorocarbon: styrene-acrylic = 80:20) according to the different ratios of fluorocarbon emulsion and styrene-acrylic emulsion.

7. The polymer self-healing waterproof coating according to claim 1, characterized in that, The dispersant is polycarboxylic acid, the defoamer is an organosilicon defoamer, and the leveling agent is hydroxyethyl cellulose.

8. The method of using a polymer self-healing waterproof coating according to any one of claims 1-7, characterized in that, Includes the following steps: S1 Polymer Self-Healing Waterproof Coating Preparation: By weight, use 15-30 parts cement, 10-20 parts carbonized waste aerated concrete blocks, 6-12 parts carbonized copper slag, 7.5-15 parts modified montmorillonite, 35-50 parts polymer emulsion, 1.5-2.6 parts dispersant, 0.08-0.2 parts defoamer, and 0.1-1.4 parts leveling agent. Mix and stir evenly to obtain the polymer self-healing waterproof coating. S2 Undercoat: Spray a high styrene-acrylic (polymer) emulsion slurry (fluorocarbon: styrene-acrylic = 20:80), and let it stand for 5 minutes to allow some of the moisture to evaporate; S3 Intermediate Layer Coating: When the bottom layer is in a semi-dry state, a mixed slurry (fluorocarbon: styrene-acrylic = 50:50) is sprayed on, and capillary action is used to promote the low Tg styrene-acrylic emulsion to float to the surface; S4 Surface Coating: After the intermediate layer is surface dry, spray a high-fluorocarbon emulsion slurry (fluorocarbon: styrene-acrylic = 80:20); S5 curing: Curing with hot air at 60℃ for 2 hours, allowing polymer chains in different layers to cross-penetrate and cross-link.

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