Anti-crack putty material and preparation method thereof

Abstract

The invention belongs to the technical field of putty materials, and particularly provides an anti-crack putty material and a preparation method thereof, the anti-crack putty material comprises cement, a calcium carbonate raw material, a calcium carbonate functional material, talcum powder, quartz sand, fly ash, latex powder, cellulose ether, terminated polypropylene glycol, a waterproof agent, a defoaming agent and wood fiber; the calcium carbonate functional material is prepared by compounding calcium carbonate and a modified polyvinyl alcohol solution and drying. The putty material prepared by the invention has the advantages of good flexibility and cracking resistance.

Description

Technical Field

[0001] This application belongs to the technical field of putty powder materials, and in particular relates to a crack-resistant putty material and its preparation method. Background Technology

[0002] The main components of building putty powder include inorganic gel materials, organic gel materials, fillers, and additives. It is a soft paste made by mixing and formulating. The main function of putty powder is to fill wall defects and smooth the surface to ensure the smooth progress of subsequent painting projects. Therefore, putty powder needs to meet certain strength, water retention, adhesion, and crack resistance to meet the requirements of building decoration and renovation.

[0003] Cracking of putty layers is caused by a complex set of factors. These include structural cracks resulting from uneven dynamic stress within the building structure, and microcracks caused by uneven expansion or contraction due to temperature and humidity changes in the putty layer, leading to localized stress. When new cracks form in the putty layer or existing cracks extend, the coating cracks at the corresponding locations, losing its protective and decorative functions. Currently, the main approach to addressing the formation and expansion of microcracks is to improve the flexibility of the putty material. For example, adding adhesive powder can enhance the bonding and tensile strength of the putty layer. Adding wood fibers can pre-absorb some water, which is released during the dry shrinkage process, replenishing the water lost and reducing shrinkage. However, wood fibers have poor compatibility with the substrate and can also affect workability.

[0004] Given the complexity of the causes of putty cracking and its construction characteristics, exploring and developing flexible and crack-resistant putty materials is of practical significance. Summary of the Invention

[0005] To address the aforementioned issues and further improve the flexibility and crack resistance of putty materials, this application provides a crack-resistant putty material and its preparation method.

[0006] This application first provides a crack-resistant putty material, including cement, calcium carbonate virgin material, calcium carbonate functional material, talc powder, quartz sand, fly ash, latex powder, cellulose ether, end-capped polypropylene glycol, waterproofing agent, defoamer, and wood fiber; the calcium carbonate functional material is prepared by compounding and drying calcium carbonate with modified polyvinyl alcohol solution.

[0007] Furthermore, the modified polyvinyl alcohol solution is prepared by the following steps: dissolving polyvinyl alcohol in deionized water, adding sodium p-sulfonate benzaldehyde, heating to 80°C, adding hydrochloric acid to react, and after the reaction is complete, adding glycyrrhizic acid and mixing evenly to obtain the solution.

[0008] Furthermore, the mass ratio of polyvinyl alcohol to sodium p-sulfonate benzaldehyde is 1:(1.5-2).

[0009] Furthermore, the mass ratio of sodium p-sulfonate benzaldehyde to glycyrrhizic acid is 1:(0.1-0.25).

[0010] Furthermore, the mass ratio of the virgin calcium carbonate to the functional calcium carbonate is (10-15):1.

[0011] Furthermore, the mass ratio of the calcium carbonate to the modified polyvinyl alcohol solution is 1:(0.5-1).

[0012] Furthermore, the terminated polypropylene glycol is phenylboronic acid-terminated polypropylene glycol; And / or, the mass ratio of the calcium carbonate functional material to the capped polypropylene glycol is 1:(0.5-0.75).

[0013] Furthermore, the waterproofing agent is an organosilicon waterproofing agent; And / or, the latex powder is a dispersible latex powder; And / or, the defoamer is a polyether defoamer.

[0014] This application also provides a method for preparing a crack-resistant putty material, comprising the following steps: S1: The base material is prepared by uniformly mixing cement, calcium carbonate raw material, calcium carbonate functional material, talc powder, quartz sand, fly ash, latex powder, and wood fiber. S2: Mix cellulose ether, end-capped polypropylene glycol, waterproofing agent, defoamer and water, then add to the base material and stir until homogeneous.

[0015] Furthermore, in step S2, the consistency of the obtained crack-resistant putty material is 6-6.5.

[0016] Compared with the prior art, this application has the following beneficial effects: This application uses cement, calcium carbonate virgin material, talc powder, quartz sand, and fly ash as base materials. The addition of latex powder and cellulose ether improves workability, increases water retention, and enhances adhesion. Then, calcium carbonate functional material is added, utilizing the assembly structure between calcium carbonate particles and modified polyvinyl alcohol to improve the strength and flexibility of the putty layer, making it less prone to cracking under temperature and humidity changes. Furthermore, in a wet state, the sulfonic acid groups of the calcium carbonate functional material can form dynamic hydrogen bonds with the amino groups of the end-capped polypropylene glycol. During subsequent drying and shrinkage, this reduces the bond energy of the BO bonds, resulting in better dynamic repair and stress absorption, further improving the crack resistance of the putty layer. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the crack resistance test data of the putty material in Embodiment 1 of this application.

[0018] Figure 2This is a schematic diagram of the crack resistance test data of the putty material in Embodiment 2 of this application.

[0019] Figure 3 This is a schematic diagram of the crack resistance test data of the putty material in Example 3 of this application.

[0020] Figure 4 This is a schematic diagram of the crack resistance test data of the putty material in control group 1 of this application.

[0021] Figure 5 This is a schematic diagram of the crack resistance test data of the putty material in control group 2 of this application. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] When using “including,” “having,” and “contains” as described herein, the intention is to cover non-exclusive inclusion, unless an explicit qualifying term such as “only,” “consisting of,” etc., is used, in which case another component may be added.

[0025] The terms "preferred," "more preferably," "better," and "even better" used in this application refer to embodiments of this application that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this application. That is, in this application, "preferred," "more preferably," "better," and "even better" are merely descriptions of implementations or embodiments with better effects, but do not constitute a limitation on the scope of protection of this application.

[0026] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0027] In this application, "at least one" means one or more, such as one, two, or more. "Multiple" or "several" means at least two, such as two, three, etc., and "multi-layered" means at least two layers, such as two layers, three layers, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0028] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0029] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, the method comprising steps (a) and (b) indicates that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0030] In this application, "above" or "below" includes the number itself. For example, "below 1" includes 1.

[0031] In this application, room temperature refers to 0~40℃, including but not limited to 10~40℃, or further to 20~30℃.

[0032] Based on extensive experimental research, this application provides a crack-resistant putty material, comprising cement, calcium carbonate virgin material, calcium carbonate functional material, talc powder, quartz sand, fly ash, latex powder, cellulose ether, end-capped polypropylene glycol, waterproofing agent, defoamer, and wood fiber; wherein the calcium carbonate functional material is prepared by compounding and drying calcium carbonate with a modified polyvinyl alcohol solution.

[0033] Furthermore, the modified polyvinyl alcohol solution is prepared by the following steps: dissolving polyvinyl alcohol in deionized water, adding sodium p-sulfonate benzaldehyde, heating to 80°C, adding hydrochloric acid to react, and after the reaction is complete, adding glycyrrhizic acid and mixing evenly to obtain the solution.

[0034] Furthermore, the mass ratio of polyvinyl alcohol to sodium p-sulfonate benzaldehyde is 1:(1.5-2).

[0035] In some specific embodiments, the mass ratio of polyvinyl alcohol to sodium p-sulfonate benzaldehyde can be 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, or 1:2. Furthermore, under normal circumstances, a mass ratio of 1:1.65, 1:1.7, or 1:1.75 of polyvinyl alcohol to sodium p-sulfonate benzaldehyde yields better experimental results.

[0036] Furthermore, the mass ratio of sodium p-sulfonate benzaldehyde to glycyrrhizic acid is 1:(0.1-0.25).

[0037] In some specific embodiments, the mass ratio of sodium p-sulfonate benzaldehyde to glycyrrhizic acid can be 1:(0.1-0.15), 1:(0.15-0.2), or 1:(0.2-0.25). Further, the mass ratio of sodium p-sulfonate benzaldehyde to glycyrrhizic acid can be 1:0.1, 1:0.11, 1:0.12, 1:0.13, 1:0.14, 1:0.15, 1:0.16, 1:0.17, 1:0.18, 1:0.19, 1:0.2, 1:0.21, 1:0.22, 1:0.23, 1:0.24, or 1:0.25. Generally, a mass ratio of 1:0.19 or 1:0.2 for sodium p-sulfonate benzaldehyde to glycyrrhizic acid yields better experimental results.

[0038] Furthermore, L-hydroxyproline is added along with glycyrrhizic acid.

[0039] Furthermore, the mass ratio of L-hydroxyproline to glycyrrhizic acid is 1:2-3.

[0040] Furthermore, the mass ratio of the virgin calcium carbonate to the functional calcium carbonate is (10-15):1.

[0041] In some specific embodiments, the mass ratio of the virgin calcium carbonate to the functional calcium carbonate can be 10:1, 10.5:1, 11:1, 11.5:1, 12:1, 12.5:1, 13:1, 13.5:1, 14:1, 14.5:1, or 15:1. Generally, a mass ratio of virgin calcium carbonate to functional calcium carbonate of 12.5:1 yields better experimental results.

[0042] Furthermore, the mass ratio of the calcium carbonate to the modified polyvinyl alcohol solution is 1:(0.5-1).

[0043] In some specific embodiments, the mass ratio of calcium carbonate to modified polyvinyl alcohol solution can be 1:0.5, 1:0.55, 1:0.6, 1:0.65, 1:0.7, 1:0.75, 1:0.8, 1:0.85, 1:0.9, 1:0.95, or 1:1. Generally, a mass ratio of 1:0.8 or 1:0.85 yields better technical results.

[0044] Furthermore, the terminated polypropylene glycol is phenylboronic acid-terminated polypropylene glycol; Furthermore, the capped polypropylene glycol is prepared from 2-aldehyde phenylboronic acid and amino-terminated polypropylene glycol.

[0045] And / or, the mass ratio of the calcium carbonate functional material to the capped polypropylene glycol is 1:(0.5-0.75).

[0046] In some specific embodiments, the mass ratio of the calcium carbonate functional material to the capped polypropylene glycol can be 1:0.5, 1:0.55, 1:0.6, 1:0.65, 1:0.7, or 1:0.75. Generally, a mass ratio of 1:0.65 for the calcium carbonate functional material to the capped polypropylene glycol yields the best technical results.

[0047] Furthermore, the waterproofing agent is an organosilicon waterproofing agent; And / or, the latex powder is a dispersible latex powder; And / or, the defoamer is a polyether defoamer.

[0048] This application also provides a method for preparing a crack-resistant putty material, comprising the following steps: S1: The base material is prepared by uniformly mixing cement, calcium carbonate raw material, calcium carbonate functional material, talc powder, quartz sand, fly ash, latex powder, and wood fiber. S2: Mix cellulose ether, end-capped polypropylene glycol, waterproofing agent, defoamer and water, then add to the base material and stir until homogeneous.

[0049] Furthermore, in step S2, the consistency of the obtained crack-resistant putty material is 6-6.5.

[0050] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0051] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this application, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. All reagents or instruments whose manufacturers are not specified are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description in this application, any prior art methods, equipment, and materials similar to or equivalent to those described, used, or made by the methods, equipment, and materials in the embodiments of this application may be used to implement this application.

[0052] Example 1 The crack-resistant putty material in this embodiment includes 3kg cement, 10kg virgin calcium carbonate, 0.8kg functional calcium carbonate, 5.5kg talc powder, 4.5kg quartz sand, 0.75kg fly ash, 0.3kg latex powder, 30g cellulose ether, 520g end-capped polypropylene glycol, 0.25kg waterproofing agent, 10g defoamer, and 50g wood fiber.

[0053] The calcium carbonate functional material in this embodiment is prepared by mixing calcium carbonate and modified polyvinyl alcohol solution at a mass ratio of 1:0.85, and then drying and grinding at 80°C.

[0054] The modified polyvinyl alcohol solution in this embodiment was prepared by the following steps: 20g of polyvinyl alcohol was dissolved in 500mL of deionized water. After it was fully dissolved, 35g of sodium p-sulfonate benzaldehyde was added. The temperature was raised to 80℃, and 25mL of 1mol / L hydrochloric acid solution was added to react for 72h. After the reaction was completed, 7g of glycyrrhizic acid was added, and after mixing evenly, it was neutralized with alkali to obtain the solution.

[0055] The end-capped polypropylene glycol in this embodiment is prepared by the following steps: polypropylene glycol (average molecular weight of 1000) and phthalic anhydride are added to a three-necked flask at a molar ratio of 1:2 and reacted at 160°C for 5 hours to obtain carboxyl-terminated polypropylene glycol.

[0056] The cement used is 42.5 grade ordinary Portland cement. The quartz sand has a fineness of 500 mesh and a whiteness greater than 85%. The calcium carbonate has a fineness of 500 mesh (i.e., virgin calcium carbonate). The talc powder has a fineness of 450 mesh. The fly ash is grade II fly ash. The waterproofing agent is an organosilicon waterproofing agent. The defoamer is THIX-258 powdered defoamer. The latex powder is type 5044 dispersible latex powder. The cellulose ether is hydroxypropyl methylcellulose ether. The wood fiber length is 200-300 μm.

[0057] The method for preparing the crack-resistant putty material in this embodiment includes the following steps: S1: Take the above-mentioned cement, calcium carbonate raw material, calcium carbonate functional material, talc powder, quartz sand, fly ash, latex powder and wood fiber and mix them evenly to prepare the base material. S2: Mix cellulose ether, end-capped polypropylene glycol, waterproofing agent, defoamer and water and add to the base material, stir evenly to obtain the anti-crack putty material with a consistency of 6.3.

[0058] Example 2 The crack-resistant putty material in this embodiment includes 3kg cement, 10kg virgin calcium carbonate, 0.8kg functional calcium carbonate, 5.5kg talc powder, 4.5kg quartz sand, 0.75kg fly ash, 0.3kg latex powder, 30g cellulose ether, 520g end-capped polypropylene glycol, 0.25kg waterproofing agent, 10g defoamer, and 50g wood fiber.

[0059] The calcium carbonate functional material in this embodiment is prepared by mixing calcium carbonate and modified polyvinyl alcohol solution at a mass ratio of 1:0.85, and then drying and grinding at 80°C.

[0060] The modified polyvinyl alcohol solution in this embodiment was prepared by the following steps: 20g of polyvinyl alcohol was dissolved in 500mL of deionized water. After it was fully dissolved, 35g of sodium p-sulfonate benzaldehyde was added. The temperature was raised to 80℃, and 25mL of 1mol / L hydrochloric acid solution was added to react for 72h. After the reaction was completed, 7g of glycyrrhizic acid was added, and after mixing evenly, it was neutralized with alkali to obtain the solution.

[0061] The end-capped polypropylene glycol in this embodiment was prepared by the following steps: 500 mL of anhydrous ethanol, 50 g of NH2-PEG-NH2 (PEG with an average molecular weight of 1000), and 18 g of 2-aldehyde phenylboronic acid were added to a 500 mL four-necked flask equipped with a stirrer, thermometer, dropping funnel, and condenser. After mixing evenly, sodium borohydride and a small amount of PBS buffer solution were added, and the mixture was reacted at room temperature under nitrogen protection.

[0062] The cement used is 42.5 grade ordinary Portland cement. The quartz sand has a fineness of 500 mesh and a whiteness greater than 85%. The calcium carbonate has a fineness of 500 mesh (i.e., virgin calcium carbonate). The talc powder has a fineness of 450 mesh. The fly ash is grade II fly ash. The waterproofing agent is an organosilicon waterproofing agent. The defoamer is THIX-258 powdered defoamer. The latex powder is type 5044 dispersible latex powder. The cellulose ether is hydroxypropyl methylcellulose ether. The wood fiber length is 200-300 μm.

[0063] The method for preparing the crack-resistant putty material in this embodiment includes the following steps: S1: Take the above-mentioned cement, calcium carbonate raw material, calcium carbonate functional material, talc powder, quartz sand, fly ash, latex powder and wood fiber and mix them evenly to prepare the base material. S2: Mix cellulose ether, end-capped polypropylene glycol, waterproofing agent, defoamer and water and add to the base material, stir evenly to obtain the anti-crack putty material with a consistency of 6.3.

[0064] Example 3 The crack-resistant putty material in this embodiment includes 3kg cement, 10kg virgin calcium carbonate, 0.8kg functional calcium carbonate, 5.5kg talc powder, 4.5kg quartz sand, 0.75kg fly ash, 0.3kg latex powder, 30g cellulose ether, 520g end-capped polypropylene glycol, 0.25kg waterproofing agent, 10g defoamer, and 50g wood fiber.

[0065] The calcium carbonate functional material in this embodiment is prepared by mixing calcium carbonate and modified polyvinyl alcohol solution at a mass ratio of 1:0.85, and then drying and grinding at 80°C.

[0066] The modified polyvinyl alcohol solution in this embodiment was prepared by the following steps: 20g of polyvinyl alcohol was dissolved in 500mL of deionized water. After complete dissolution, 35g of sodium p-sulfonate benzaldehyde was added, the temperature was raised to 80℃, and 25mL of 1mol / L hydrochloric acid solution was added to react for 72h. After the reaction was completed, 7g of glycyrrhizic acid and 3.5g of L-hydroxyproline were added, mixed evenly, and then neutralized with alkali to obtain the solution.

[0067] The end-capped polypropylene glycol in this embodiment was prepared by the following steps: 500 mL of anhydrous ethanol, 50 g of NH2-PEG-NH2 (PEG with an average molecular weight of 1000), and 18 g of 2-aldehyde phenylboronic acid were added to a 500 mL four-necked flask equipped with a stirrer, thermometer, dropping funnel, and condenser. After mixing evenly, sodium borohydride and a small amount of PBS buffer solution were added, and the mixture was reacted at room temperature under nitrogen protection.

[0068] The cement used is 42.5 grade ordinary Portland cement. The quartz sand has a fineness of 500 mesh and a whiteness greater than 85%. The calcium carbonate has a fineness of 500 mesh (i.e., virgin calcium carbonate). The talc powder has a fineness of 450 mesh. The fly ash is grade II fly ash. The waterproofing agent is an organosilicon waterproofing agent. The defoamer is THIX-258 powdered defoamer. The latex powder is type 5044 dispersible latex powder. The cellulose ether is hydroxypropyl methylcellulose ether. The wood fiber length is 200-300 μm.

[0069] The method for preparing the crack-resistant putty material in this embodiment includes the following steps: S1: Take the above-mentioned cement, calcium carbonate raw material, calcium carbonate functional material, talc powder, quartz sand, fly ash, latex powder and wood fiber and mix them evenly to prepare the base material. S2: Mix cellulose ether, end-capped polypropylene glycol, waterproofing agent, defoamer and water and add to the base material, stir evenly to obtain the anti-crack putty material with a consistency of 6.3.

[0070] Control group 1 The putty materials in this control group included 3 kg of cement, 10.8 kg of virgin calcium carbonate, 5.5 kg of talc powder, 4.5 kg of quartz sand, 0.75 kg of fly ash, 0.3 kg of latex powder, 30 g of cellulose ether, 520 g of end-capped polypropylene glycol, 0.25 kg of waterproofing agent, 10 g of defoamer, and 50 g of wood fiber.

[0071] The end-capped polypropylene glycol in this control group was prepared by the following steps: polypropylene glycol (average molecular weight of 1000) and phthalic anhydride were added to a three-necked flask at a molar ratio of 1:2 and reacted at 160°C for 5 hours to obtain carboxyl-terminated polypropylene glycol.

[0072] The cement used is 42.5 grade ordinary Portland cement. The quartz sand has a fineness of 500 mesh and a whiteness greater than 85%. The calcium carbonate has a fineness of 500 mesh (i.e., virgin calcium carbonate). The talc powder has a fineness of 450 mesh. The fly ash is grade II fly ash. The waterproofing agent is an organosilicon waterproofing agent. The defoamer is THIX-258 powdered defoamer. The latex powder is type 5044 dispersible latex powder. The cellulose ether is hydroxypropyl methylcellulose ether. The wood fiber length is 200-300 μm.

[0073] The preparation method of the putty material in this control group includes the following steps: S1: Take the above-mentioned cement, calcium carbonate raw material, talc powder, quartz sand, fly ash, latex powder and wood fiber and mix them evenly to prepare the base material; S2: Mix cellulose ether, end-capped polypropylene glycol, waterproofing agent, defoamer and water and add to the base material, stir evenly to obtain the putty material with a consistency of 6.3.

[0074] Control group 2 The putty materials in this control group included 3 kg of cement, 10.8 kg of virgin calcium carbonate, 5.5 kg of talc powder, 4.5 kg of quartz sand, 0.75 kg of fly ash, 0.3 kg of latex powder, 30 g of cellulose ether, 0.25 kg of waterproofing agent, 10 g of defoamer, and 50 g of wood fiber.

[0075] The cement used is 42.5 grade ordinary Portland cement. The quartz sand has a fineness of 500 mesh and a whiteness greater than 85%. The calcium carbonate has a fineness of 500 mesh (i.e., virgin calcium carbonate). The talc powder has a fineness of 450 mesh. The fly ash is grade II fly ash. The waterproofing agent is an organosilicon waterproofing agent. The defoamer is THIX-258 powdered defoamer. The latex powder is type 5044 dispersible latex powder. The cellulose ether is hydroxypropyl methylcellulose ether. The wood fiber length is 200-300 μm.

[0076] The preparation method of the putty material in this control group includes the following steps: S1: Take the above-mentioned cement, calcium carbonate raw material, talc powder, quartz sand, fly ash, latex powder and wood fiber and mix them evenly to prepare the base material; S2: Mix cellulose ether, waterproofing agent, defoamer and water and add to the base material, stir evenly to obtain the putty material with a consistency of 6.3.

[0077] Performance testing The putty materials from Examples 1-3 and Control Groups 1-2 were applied to precast cracked cement slabs (the cement slab substrate conformed to standard JC / T 412.1-2006 NFAHV, with dimensions of 150mm × 70mm × 4mm). A 2mm thick wet putty film was applied and cured for 7 days under standard curing conditions. Then, tests were conducted on a high-precision mechanical testing machine. Specifically, metal clamps were fixed to the upper and lower ends of the cement slab, parallel to the slab, and moved at a speed of 0.02mm / s until fracture. Load-displacement data were obtained by measuring the displacement of the crossbeam of the mechanical testing machine and the load on the cement slab. The results are shown below. Figure 1-5 As shown.

[0078] analyze Figure 1-5 It can be seen that the ultimate displacement value and maximum load of the crack-resistant putty material of this application are higher than those of ordinary putty materials. It has better flexibility and dynamic crack resistance, can reduce intrinsic cracking and matrix crack propagation, and has excellent construction performance.

[0079] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A crack-resistant putty material, characterized in that: It includes cement, calcium carbonate raw material, calcium carbonate functional material, talc powder, quartz sand, fly ash, latex powder, cellulose ether, end-capped polypropylene glycol, waterproofing agent, defoamer, and wood fiber; the calcium carbonate functional material is prepared by compounding and drying calcium carbonate with modified polyvinyl alcohol solution.

2. The crack-resistant putty material according to claim 1, characterized in that: The modified polyvinyl alcohol solution is prepared by the following steps: dissolving polyvinyl alcohol in deionized water, adding sodium p-sulfonate benzaldehyde, heating to 80°C, adding hydrochloric acid to react, and after the reaction is complete, adding glycyrrhizic acid and mixing evenly to obtain the solution.

3. The crack-resistant putty material according to claim 2, characterized in that: The mass ratio of polyvinyl alcohol to sodium p-sulfonate benzaldehyde is 1:(1.5-2).

4. The crack-resistant putty material according to claim 2, characterized in that: The mass ratio of sodium p-sulfonate benzaldehyde to glycyrrhizic acid is 1:(0.1-0.25).

5. The crack-resistant putty material according to claim 1, characterized in that: The mass ratio of the virgin calcium carbonate to the functional calcium carbonate is (10-15):

1.

6. The crack-resistant putty material according to claim 1, characterized in that: The mass ratio of calcium carbonate to modified polyvinyl alcohol solution is 1:(0.5-1).

7. The crack-resistant putty material according to claim 1, characterized in that: The terminated polypropylene glycol is phenylboronic acid-terminated polypropylene glycol; And / or, the mass ratio of the calcium carbonate functional material to the capped polypropylene glycol is 1:(0.5-0.75).

8. The crack-resistant putty material according to claim 1, characterized in that: The waterproofing agent is an organosilicon waterproofing agent; And / or, the latex powder is a dispersible latex powder; And / or, the defoamer is a polyether defoamer.

9. A method for preparing a crack-resistant putty material, characterized in that: Includes the following steps: S1: The base material is prepared by uniformly mixing cement, calcium carbonate raw material, calcium carbonate functional material, talc powder, quartz sand, fly ash, latex powder, and wood fiber. S2: Mix cellulose ether, end-capped polypropylene glycol, waterproofing agent, defoamer and water, then add to the base material and stir until homogeneous.

10. The method for preparing the crack-resistant putty material according to claim 9, characterized in that: In step S2, the consistency of the obtained crack-resistant putty material is 6-6.5.

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