Wall surface cracking repairing agent and application method thereof

Abstract

The invention discloses a wall surface cracking repairing agent and an application method thereof, and the wall surface cracking repairing agent comprises 0.5-1 part by weight of an elastic emulsion, 0.1-0.5 part by weight of fragile porous particles and 0.1-1 part by weight of a strength curing material, wherein the elastic emulsion is a styrene-acrylic emulsion, a silicone-acrylic emulsion, a pure acrylic emulsion, a fluorocarbon emulsion, an epoxy emulsion, an acrylic emulsion and a vinyl acetate emulsion; the fragile porous particles are expanded perlite and diatomite; and the strength curing material is building cement. The wall surface crack repairing agent is scraped, filled and leveled to wall surface cracks for multiple times, wall surface crack repairing can be completed, the wall surface cracks are still not cracked after multiple times of cold and hot circulation dynamic cracking treatment, and the good repairing effect is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of wall repair agents, and particularly relates to a wall crack repair agent and an application method thereof. Background Art

[0002] Due to thermal expansion and contraction and dynamic cracking of the foundation wall, cracks are becoming increasingly common, seriously affecting the aesthetics of the house and causing some safety issues. Currently, there are many methods for repairing and preventing wall cracks, which can be roughly divided into the following categories: one is to directly apply inorganic materials such as putty powder to fill the crack; another is to use a combination of mesh tape and putty powder to repair the crack. Specifically, the wall skin on both sides of the crack is scraped off, glue is applied, and then mesh tape is applied. Finally, putty powder and latex paint are applied on the mesh tape; the third is to use elastic putty for repair.

[0003] Traditionally, inorganic materials such as putty powder are used directly for repair. Due to the poor flexibility of inorganic materials, they will continue to produce brittle cracks due to thermal expansion and contraction after a period of time. In addition, the concentration of inorganic materials such as putty powder needs to be adjusted according to actual conditions when used, which makes the operation difficult and inconvenient. The combination of inorganic materials and grid tape can prevent cracks when the active stress of the wall is less than the tensile strength of the material. Once the amount of activity increases, such as cracks, deformation, settlement, loosening, etc. on the foundation wall, the wall will cause cracks again. In severe cases, the grid tape will separate from the inorganic material, which can easily lead to large-scale peeling of the repaired area. When using elastic putty for repair, it can only be used for cracks smaller than 0.5mm. Cracks larger than 2mm require elastic putty and grid tape to be repaired, which also have the above problems.

[0004] To this end, Chinese patent CN 113667342 A discloses a method for preparing and using a wall crack repair paste. The raw materials include 65-80 parts quartz sand, 1-2 parts titanium dioxide, 10-20 parts polymer emulsion, 1-2 parts film-forming aid, 0.2-0.4 parts preservative, 0.3-0.8 parts thickener, 10-15 parts deionized water, and 0.3-0.5 parts auxiliary components. This paste combines the strength of inorganic materials with the flexibility of organic materials, and, along with the alkali-swellable thickener, effectively reduces shrinkage and collapse. It can directly repair cracks up to 20 mm in width without the need for auxiliary materials such as mesh tape or kraft paper.

[0005] Chinese patent CN110803896B discloses a repair material for cracked building walls, comprising 0.1-0.3 parts of silicon dioxide, 0.2-0.4 parts of talc, 0.1-0.3 parts of silicate double salt, 0.04-0.08 parts of inorganic minerals, 2.5-8 parts of cement clinker, 1-4 parts of hydroxypropyl methylcellulose, 3-25 parts of sodium tripolyphosphate, 1-5 parts of polypropylene staple fibers, 2-8 parts of mixed materials, 1-11 parts of gypsum, 0.4-3 parts of grinding aid, 0.2-4 parts of ultrafine admixture, and 5-28 parts of water. This material can repair cracks in one go, is less likely to recur, fall off, or produce hollowing, and can also prevent alkali backflow in the wall.

[0006] However, existing repair materials for wall or wall cracks have problems such as unsatisfactory repair effects, complex raw materials, and high costs. They have limited resistance to secondary cracks caused by thermal expansion and contraction and dynamic cracking of walls due to climate reasons, and cannot achieve long-term solutions and prevention of wall cracking. Summary of the Invention

[0007] In response to the above technical problems, the present invention provides a wall crack repair agent and an application method thereof. The wall crack repair agent has certain surface stability, strength elasticity and an internal multi-void easy-exchange structure. It can resist deformation of the wall due to thermal expansion and contraction or micro-dynamic cracking of the foundation, avoid the occurrence of secondary cracking, and has good and long-lasting repair effect.

[0008] In order to achieve the above object, the present invention provides a wall crack repair agent, comprising 0.5-1 parts by weight of elastic emulsion, 0.1-0.5 parts by weight of fragile multi-void particles and 0.1-1 parts by weight of strength curing material.

[0009] Preferably, the elastic emulsion has a viscosity of 100-2000 mPa·s, an elongation of 0.5-3 times, a glass transition temperature of -2 to -15°C, and a solid content of 45-55%.

[0010] More preferably, the elastic emulsion is any one or more of styrene acrylic emulsion, silicone acrylic emulsion, pure acrylic emulsion, fluorocarbon emulsion, epoxy emulsion, acrylic emulsion, and vinyl acetate emulsion.

[0011] Preferably, the particle size of the fragile porous particles is 0.1-5 mm, and the bulk density is 120-320 kg / m 3 , hardness is 4-7.5.

[0012] More preferably, the fragile porous particles are expanded perlite or diatomaceous earth.

[0013] Preferably, the strength curing material is cement with a strength grade of 32.5-42.5.

[0014] The present invention also provides an application method of a wall crack repair agent, comprising the following steps: (1) Mixing the elastic emulsion, the fragile multi-porous particles and the strength curing material and adjusting them to a uniform paste to obtain a wall crack repair agent; (2) Clean the inside of the wall cracks and the surrounding walls; (3) Apply wall crack repair agent to the crack until it is slightly higher than the wall surface by 0.5-2mm. After drying, the repair is completed.

[0015] Preferably, the wall cracks in step (2) have a depth of 0.5-8 cm and a width of 0.05-5 cm.

[0016] Further preferably, the wall cracks are any one or more cracks selected from the group consisting of wall foundation mortar cracks, wall paint cracks, decoration board cracks, and decoration process joint cracks.

[0017] Preferably, the number of times of scraping and leveling in step (3) is 1-5 times, and the interval between each scraping and leveling is ≥4 hours and then repeated.

[0018] The beneficial effects of the present invention are: 1. The elastic emulsion has a significant natural expansion and contraction effect after drying and the surface is not easy to crack. It has good water resistance, alkali resistance, bonding adhesion and other physical properties. It can resist the changes in force caused by the wall surface due to thermal expansion and contraction, and deformation of the foundation wall due to settlement and loosening, thus avoiding cracks and secondary cracks after repair. In addition, after the repair agent is applied to the cracks on the wall, part of the elastic emulsion will gather on the crack surface and the connection between the repair agent and the wall, enhancing the adhesion between the repair agent and the wall, and preventing the repair agent from falling off after the wall is deformed, affecting the repair effect; in addition, after the elastic emulsion is used in combination with fragile multi-porous particles and strength-curing materials, the surface film forms a structure with higher overall strength, which is combined with the amorphous flexible structure formed by the internal shrinkage-type curing. Under the condition of internal irregular dynamic deformation, it can effectively ensure that the surface does not deform, wrinkle, sag, or crack, etc., and has a good effect in preventing secondary cracking.

[0019] 2. The fragile multi-porous particles can form an irregular multi-porous, easily exchangeable soft network structure inside the repair material after the repair agent is scraped onto the cracks on the wall. The strength is relatively low, but there is enough exchange space, which is easy to deform dynamically with the cracks. Moreover, the fragile multi-porous particles can be cross-linked with each other under the action of the elastic emulsion, maintaining a certain degree of dislocation in the internal structure, so that the interior of the repair agent can form natural expansion and contraction, absorb the force generated by the deformation of the wall, improve the overall repair effect, and avoid secondary cracking on the wall surface.

[0020] 3. The strength curing material enhances the adhesion and stability between the repair agent and the wall, improves the waterproofness, and enhances the curing efficiency of the repair agent, further improving the repair effect of the repair agent and avoiding the occurrence of secondary cracking or deformation.

[0021] 4. The present invention has excellent surface crack resistance, excellent internal structure physical adjustment performance, and excellent overall stability performance. It is widely used in filling the joints of decorative panels and repairing cracks in walls and floors during indoor and outdoor decoration processes. It also has excellent waterproof and water-resistant properties and is suitable for new crack filling construction and crack repair in basements, bathrooms, swimming pools and other areas.

[0022] 5. The fragile multi-porous particle structure inside the present invention also has the function of heat preservation and insulation, and can be used in the construction of heat preservation and insulation projects for interior and exterior walls and roofs of buildings.

[0023] 6. The raw materials selected in the present invention are mainly water-based systems, which have high environmental performance. The products are non-toxic and odorless, and are widely used in filling and repairing cracks in food and building structures. Moreover, the raw materials are all conventional material products with low cost and are suitable for large-scale production applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure after the wall cracks are repaired in Example 6. In the figure, 1 is the basic wall, 2 is the internal porous soft and easily exchangeable structure, 3 is the surface strength elastic film layer, 4 is the wall connection strength elastic film layer, and 5 is the dead angle space inside the crack.

[0025] Figure 2 This is a painted image of the interior of the bamboo basin in Example 9.

[0026] Figure 3 This is a painted image of the outside of the bamboo basin in Example 9.

[0027] Figure 4 This is a picture of the exterior of the bamboo basin in Example 9 after being coated and dried.

[0028] Figure 5 This is a picture of the inside and outside of the bamboo basin in Example 9. DETAILED DESCRIPTION

[0029] The technical solutions of the present invention are further explained below with reference to the accompanying drawings and specific embodiments. It is worth noting that the following embodiments are only preferred embodiments of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the claims. Any modifications or substitutions made to the technical solutions of the present invention by those skilled in the art without creative effort shall fall within the scope of protection of the present invention.

[0030] Example 1 A wall repair agent, the formula is 0.5 parts by weight of styrene acrylic emulsion (viscosity 800mPa·s, solid content 48%), 0.1 parts by weight of expanded perlite (particle size 0.5mm, bulk density 220kg / m 3 , hardness 5.3) and 0.1 parts by weight of cement (strength grade 42.5); Preparation method: Mix and stir the above raw materials until they are in a uniform paste to obtain a wall repair agent.

[0031] Example 2 A wall repair agent is prepared by the same method as in Example 1, comprising 0.8 parts by weight of a silicone-acrylic emulsion (viscosity of 100 mPa·s and a solid content of 48%), 0.1 parts by weight of expanded perlite, and 0.8 parts by weight of cement (strength of 32.5).

[0032] Example 3 A wall repair agent is prepared by the same method as in Example 1. The formulation comprises 1 part by weight of pure acrylic emulsion (viscosity 500 mPa·s, solid content 48%), 0.5 part by weight of expanded perlite, and 1 part by weight of cement (strength 42.5).

[0033] Example 4 A wall repair agent, the formula is 0.5 parts by weight of fluorocarbon emulsion (viscosity 1000mPa·s, solid content 55%), 0.5 parts by weight of diatomaceous earth (particle size 2mm), and the bulk density is 300kg / m 3 , hardness 5.2) and 0.3 parts by weight of cement (strength 32.5), the preparation method is the same as Example 1.

[0034] Example 5 A wall repair agent is prepared by the same method as in Example 1, comprising 1 part by weight of vinyl acetate emulsion (viscosity of 1500 mPa·s and solids content of 52%), 0.1 part by weight of diatomaceous earth, and 0.1 part by weight of cement (strength of 42.5).

[0035] Comparative Example 1 A wall repair agent, comprising 0.8 parts by weight of a silicone-acrylic emulsion (viscosity 800 mPa·s, solids content 55%) and 0.3 parts by weight of expanded perlite (particle size 0.5 mm); The preparation method comprises the following steps: mixing silicone acrylic emulsion and expanded perlite, stirring the mixture until the mixture becomes uniform and paste-like, thereby obtaining a wall repair agent.

[0036] Comparative Example 2 A wall repair agent, comprising 0.8 parts by weight of a silicone-acrylic emulsion (viscosity 800 mPa·s, solids content 55%) and 0.7 parts by weight of cement (strength grade 42.5); The preparation method comprises the following steps: mixing silicone acrylic emulsion with cement and stirring until the mixture becomes uniform and paste-like to obtain a wall repair agent.

[0037] Comparative Example 3 A wall repair agent, the formula is 0.3 parts by weight of expanded perlite (particle size 0.5mm) and 0.7 parts by weight of cement (strength grade 42.5); The preparation method comprises the following steps: mixing expanded perlite and cement, stirring the mixture to a uniform paste, and obtaining the wall repair agent.

[0038] Example 6 The wall repair agent prepared in the above examples and comparative examples was used to repair wall cracks. The specific method is as follows: (1) Prepare a wall crack model with a depth of 8 mm and a width of 5 mm - wall paint cracks, and clean the inside and surrounding wall of the cracks; (2) Apply the wall repair agent in batches and let it sit for 7 days to complete the wall crack repair.

[0039] Comparative Example 4 (1) Prepare a wall crack model as in Example 6, and clean the inside of the wall crack and the surrounding wall surface; (2) Use gypsum powder (solid content of about 75%, viscosity 2.2 cP) to fill the cracks in batches, then apply mesh tape and let it stand for 1 day to complete the wall crack repair.

[0040] Comparative Example 5 (1) Prepare a wall crack model as in Example 6, and clean the inside of the wall crack and the surrounding wall surface; (2) Use elastic putty Nippon Odorless Easy-to-Apply Joint King to fill the cracks in batches, then apply mesh tape and let it sit for 3 days to complete the wall crack repair.

[0041] Example 7 The surface tensile strength, elongation at break and bonding strength of the cracked rear wall model repaired in Example 6 and Comparative Examples 4-5 were measured according to GB / T23445-2009. The results are shown in Table 1. Take the crack model of the rear wall after repair in Example 6 and Comparative Examples 4-5, cut open the crack after repair, and observe the internal void structure. The results are shown in Table 1 and Figure 1 ; The wall crack models after repair in Example 6 and Comparative Examples 4-5 were placed in an environment of 45°C and 85% humidity for one week, and then transferred to an environment of -5°C and 60% humidity for one week. The cycle was repeated 50 times. The cases where cracks reappeared in the repaired wall crack models were counted. The results are shown in Table 1: Table 1 Performance indicators after repair

[0042] As shown in Table 1 above, the cracks repaired by the wall crack repair agent prepared by Examples 1-5 have excellent properties, have high bonding performance with the wall, and will not crack or fall off again after multiple hot and cold cycle treatments.

[0043] The rear wall crack models repaired in Example 6 and Comparative Examples 4-5 were tested for tensile bond strength, thermal conductivity (average temperature 25°C), and dry density according to GB / T 20473-2021. The results are shown in Table 2: Table 2 Performance indicators after repair

[0044] Example 8 (1) Select a wall crack with a depth of 20 mm and a width of 20 mm, and clean the inside of the crack and the surrounding wall; (2) Prepare a wall crack repair agent according to Example 2; (3) Apply the wall crack repair agent in batches to fill the wall cracks in step (1) and let it stand for 7 days to complete the repair.

[0045] Follow-up visits after 7 days, one month, six months and one year found that no secondary cracks had occurred, and the surface of the repaired part was not wrinkled, dented or cracked.

[0046] Example 9 (1) Prepare a wall crack repair agent according to Example 2; (2) Use a bamboo basin and apply the wall crack repair agent on its inner surface, outer surface, and inner and outer surfaces with a thickness of 0.5 cm. Then let it stand for 1 day to complete the crack filling; (3) After filling, the bamboo basin was dropped from different heights and repeated twice to observe the appearance and whether there were cracks. The bamboo basin was filled with water and left to stand for 5 minutes before observing the leakage. The results are shown in Table 3 and Figure 2-5 .

[0047] Table 3 Performance of bamboo pots after repair

[0048] The results are shown in Table 3 and Figure 2-5 It can be seen that the bamboo basin coated with wall crack repair agent will not crack after falling multiple times and will not leak water, and has good crack repair performance.

Claims

1. A wall crack repair agent, characterized by: The invention comprises 0.5-1 parts by weight of elastic emulsion, 0.1-0.5 parts by weight of fragile multi-void particles and 0.1-1 parts by weight of strength curing material.

2. A wall crack repair agent according to claim 1, characterized in that: The elastic emulsion has a viscosity of 100-2000 mPa·s, an elongation of 0.5-3 times, a glass transition temperature of -2 to -15°C, and a solid content of 45-55%.

3. A wall crack repair agent according to claim 2, characterized in that: The elastic emulsion is any one or more of styrene acrylic emulsion, silicone acrylic emulsion, pure acrylic emulsion, fluorocarbon emulsion, epoxy emulsion, acrylic emulsion, and vinyl acetate emulsion.

4. A wall crack repair agent according to claim 1, characterized in that: The particle size of the fragile multi-porous particles is 0.1-5 mm, and the bulk density is 120-320 kg / m 3 , hardness is 4-7.

5.

5. A wall crack repair agent according to claim 4, characterized in that: The breakable porous particles are expanded perlite and / or diatomaceous earth.

6. A wall crack repair agent according to claim 1, characterized in that: The strength curing material is cement with a strength grade of 32.5-42.

5.

7. A method for applying the wall crack repair agent according to any one of claims 1 to 6, characterized in that: The steps include: (1) Mixing the elastic emulsion, the fragile multi-porous particles and the strength curing material and adjusting them to a uniform paste to obtain a wall crack repair agent; (2) Clean the inside of the wall cracks and the surrounding walls; (3) Apply wall crack repair agent to the crack until it is slightly higher than the wall surface by 0.5-2mm. After drying, the repair is completed.

8. The application method according to claim 7, characterized in that: The number of times of scraping and leveling in step (3) is 1-5 times, and the interval between each scraping and leveling is ≥4h and then repeated.

9. The application method according to claim 7, characterized in that: The wall cracks described in step (2) have a depth of 0.5-8 cm and a width of 0.05-5 cm.

10. The application method according to claim 9, characterized in that: The wall cracks are any one or more cracks selected from the group consisting of wall foundation mortar cracks, wall paint cracks, decoration board cracks, and decoration process joint cracks.

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