CN114644494B

CN114644494B - Flexible light leveling mortar and preparation method and application thereof

Info

Publication number: CN114644494B
Application number: CN202210428622.9A
Authority: CN
Inventors: 宋长友; 王兵涛; 刘祥枝; 续俊峰
Original assignee: Beijing Yuezhu Xintian Energy Saving Technology Co ltd
Current assignee: Beijing Yuezhu Xintian Energy Saving Technology Co ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2023-03-21
Anticipated expiration: 2042-04-22
Also published as: CN114644494A

Abstract

The invention relates to the field of building materials, in particular to flexible light leveling mortar and a preparation method and application thereof. Comprises the following components in percentage by weight of 1: (3-4) a material A and a material B, wherein: the material A comprises the following raw materials in parts by weight: 0.2 to 0.3 weight portion of preservative, 0.1 to 0.3 weight portion of defoaming agent and 30 to 50 weight portions of polymer emulsion; the material B comprises the following raw materials in parts by weight: 25 to 30 portions of cement, 5 to 10 portions of fly ash, 60 to 70 portions of filler, 0.15 to 0.25 portion of cellulose ether, 0.5 to 1 portion of viscosity-reducing slipping agent and the like. The flexible light leveling mortar has improved adhesion, flexibility, leveling property, constructability and decorative effect with the old ceramic tile, and can be used for renovating and leveling the old ceramic tile. Thereby avoiding the phenomena of cracking, bulging and falling caused by insufficient bonding force with the old ceramic tile, insufficient flexibility, insufficient weather resistance, excessive layered interface and the like easily caused by the treatment of the traditional technical measures.

Description

Flexible light leveling mortar and preparation method and application thereof

Technical Field

The invention relates to the field of building materials, in particular to flexible light leveling mortar and a preparation method and application thereof.

Background

The existing building area of the existing outer wall of China with ceramic tiles or mosaics pasted is very large, on one hand, the old veneers are more or less cracked and fall off due to unreasonable material matching, long time and other reasons, which greatly affects the appearance of the city and the life safety of people and needs to be repaired; in addition, the demand of beautiful city engineering makes the architectural decoration look new and more, so the existing architectural modification technology for ceramic tile renovation has a large market. On the other hand, when the original building does not have external heat preservation and needs energy-saving reconstruction, the ceramic tile veneer also needs to be processed to provide a solid base layer for the external heat preservation and energy-saving reconstruction.

If the ceramic tile is integrally removed, the integral leveling is needed after the removal, so that the scheme has high cost, long period and great influence; if the local repair is carried out on the ceramic tile, the problem of unattractive patched repair exists, and the unrepaired part still has potential safety hazard and is necessarily in a state of continuous problem-causing and continuous maintenance. Therefore, the existing common renovation technology is to perform integral treatment on the basis of the original ceramic tile facing, and two technical schemes are generally adopted: firstly, processing old ceramic tiles by adopting a ceramic tile renovating interface agent, scraping 2-3 times of conventional outer wall waterproof putty, and finally performing coating facing construction, wherein a wall body with poor flatness can perform a plastering mortar leveling layer under the putty layer, and the method has the defects of high construction cost and long period caused by a large number of construction layers, and hidden troubles exist in the stability of adjacent layer materials caused by a large number of interfaces; in addition, the interface agent is generally treated by using low-cost glue solutions such as polyvinyl alcohol glue, white latex and the like, the water resistance and the weather resistance are seriously insufficient, in addition, the adhesion and the flexibility of the plastering mortar and the common putty are generally insufficient, the problems of hollowing, cracking and falling can occur within two to three years of the application life, the subsequent maintenance is needed, and the resources are greatly wasted; the second technique is that firstly the special ceramic tile renovating putty is adopted to treat the original ceramic tile veneer, and then the matched exterior wall water-resistant putty is used for leveling, the defects are that the products are not uniform, the bonding force of a plurality of products to the ceramic tile is poor, the flexibility is not enough, the phenomena of cracking and falling are caused, in addition, the leveling property is not enough, the construction is required for 2-3 times, even one more plastering mortar is required to be added for leveling, the working efficiency is low, the construction cost is improved, and the construction period is long.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

Object of the Invention

In order to solve the problems, the invention aims to provide flexible light leveling mortar and a preparation method and application thereof.

The flexible light leveling mortar has the characteristics of high bonding strength, high flexibility, high leveling property and low viscosity, and can have strong adhesive force with various ceramic tile base layers in dry and wet states so as not to be separated easily; excellent flexibility, can not only adapt to the deformation of the base layer, but also keep excellent crack resistance when being smeared; the light weight and the moderate viscosity, the excellent leveling property and the excellent leveling property, the thickness of one-time batch smearing can reach 3-10mm without slipping, the requirement that a large bar is scraped to form a fine and smooth surface can be met, the leveling surface can meet the requirement of direct construction of thick paint, and a putty leveling layer is not required. Therefore, the construction procedures can be greatly reduced, the cost is reduced, and the working efficiency is improved. If the external thermal insulation system of the building external wall is constructed again on the leveling mortar, when the thickness of the mortar is more than 2mm, a solid base layer meeting the standard strength requirement can still be provided. When the flexible light leveling mortar is constructed, the effect of pressing the alkali-resistant glass fiber mesh fabric which meets the standard of external thermal insulation products on the surface of the external wall is more ideal.

Solution scheme

In order to achieve the purpose of the invention, the embodiment of the invention provides flexible light leveling mortar, which comprises the following components in percentage by weight: (3-4) materials A and materials B, wherein:

the material A comprises the following raw materials in parts by weight: 0.2 to 0.3 weight portion of preservative, 0.1 to 0.3 weight portion of defoaming agent and 30 to 50 weight portions of polymer emulsion;

the material B comprises the following raw materials in parts by weight: 25 to 30 portions of cement, 5 to 10 portions of fly ash, 60 to 70 portions of filler, 0.15 to 0.25 portion of cellulose ether, 0.5 to 1 portion of viscosity-reducing slipping agent, 0 to 0.2 portion of high-strength fiber, 0 to 5 portions of vitrified micro bubbles and 0 to 0.5 portion of water repellent;

further, the material A comprises the following raw materials in parts by weight: 0.2 to 0.3 weight portion of preservative, 0.1 to 0.3 weight portion of defoaming agent and 35 to 45 weight portions of polymer emulsion;

optionally, the material a comprises the following raw materials in parts by weight: 0.2 to 0.3 weight portion of preservative, 0.2 to 0.3 weight portion of defoaming agent and 40 to 45 weight portions of polymer emulsion;

optionally, the material a comprises the following raw materials in parts by weight: 0.2 part of preservative, 0.3 part of defoaming agent and 40-45 parts of polymer emulsion;

optionally, the material a comprises the following raw materials in parts by weight: 0.2 parts of preservative, 0.3 parts of defoamer and 45 parts of polymer emulsion;

optionally, the material A also comprises water, and the adding amount of the water is to make the material A complement to 100 parts by weight.

Further, in the material a, the polymer emulsion is a waterproof acrylic emulsion, optionally a waterproof styrene-acrylate copolymer emulsion (referred to as a styrene-acrylic solution), optionally, the viscosity of the polymer emulsion is 500-2000mpa.s, optionally, the viscosity is 500-1500mpa.s. The waterproof acrylic emulsion includes an elastic waterproof acrylic emulsion such as an elastic waterproof styrene-acrylate copolymer emulsion, and an elastic waterproof acrylic emulsion BLJ-953B having a viscosity of 500 to 1500mpa.s can be used as the waterproof acrylic emulsion. The viscosity value was measured at 23 ℃ by using an NDJ-1 type rotary viscometer, specifically, a spindle 3# using an NDJ-1 type rotary viscometer at a spindle rotation speed of 60 rpm.

Further, in the material A, the preservative is a preservative in a universal liquid tank;

further, in the material A, the defoaming agent is a mineral oil defoaming agent.

Further, the material B comprises the following raw materials in parts by weight: 25 to 30 portions of cement, 5 to 10 portions of fly ash, 60 to 70 portions of filler, 0.15 to 0.25 portion of cellulose ether, 0.5 to 1 portion of viscosity-reducing slipping agent, 0.1 to 0.2 portion of anhydrous superfine high-strength fiber, 3 to 5 portions of vitrified micro bubbles and 0.1 to 0.5 portion of water repellent;

further, the material B comprises the following raw materials in parts by weight: 26 parts of cement, 5.7 parts of fly ash, 63 parts of filler, 0.2 part of cellulose ether, 0.6 part of viscosity-reducing slipping agent, 0.2 part of high-strength fiber, 4 parts of vitrified micro bubbles and 0.3 part of water repellent.

Further, the filler is scouring sand, optionally, the scouring sand comprises 40-70 mesh scouring sand, 70-100 mesh scouring sand and 100-200 mesh scouring sand, and the weight ratio of the scouring sand to the scouring sand is 10-15: 35 to 55:5 to 10. Preferably, the dried scouring sand produced in Chengdu area. The scouring sand is raw sand for casting, is made up by using natural silica sand through the processes of scouring, water-washing, grading and drying, and SiO ₂ The content is up to more than 98 percent, the mud content is less than 0.2 percent, the particles are full, the strength is extremely high, and the high-quality filler belongs to high-quality fillers. The inventor can well meet the construction requirement of one-time plastering thickness of 3-10mm when leveling treatment is carried out by continuously grading three meshes, and the surface is smooth and exquisite and does not crack; when only coarse sand or medium sand is used, the fineness of the mortar is poor, and the surface can not meet the requirement of coating construction; when only fine sand is used, the leveling property is insufficient, and the fine sand is easy to crack, namely, the continuous grading of the mesh number of each component of the filler is a specific selection made by the inventor for the flexible light leveling mortar with a specific purpose.

Further, the viscosity-reducing slipping agent comprises the following components in a mass ratio of 0.01-0.02: 0.05 to 0.1:0.1 to 0.3: 0.3-0.5 of air entraining agent, starch ether, erucamide and polyvinylpyrrolidone; preferably, the following components: the air entraining agent is FLOTAGE AE-1 air entraining agent which is produced by Guangdong Longhu science and technology GmbH and has small bubbles and good foam stability; the starch ether is OPAGEL FP9 starch ether which is produced by Ivy corporation in Netherlands and has super-strong thickening, thixotropic property and stronger effect; the erucamide is white powder and the amide content is more than or equal to 98 percent; the polyvinylpyrrolidone is white powdery industrial grade product with K value of 30 and molecular weight of 45000-58000.

Further, the cement is portland cement having a strength grade of 42.5MPa, optionally ordinary portland cement or white portland cement having a strength grade of 42.5 MPa.

Further, the fly ash is first-grade or second-grade fly ash.

Further, the cellulose ether is a cellulose ether having a viscosity of 20000 to 40000mpa.s, optionally 25000 to 35000mpa.s; such as: cellulose ether Combizell 30011C with a viscosity of 25000-35000mPa.s, from Hercules chemical Limited.

Further, the high-strength fiber is a modified polypropylene fiber, preferably a modified polypropylene fiber which is produced by Beijing Zhongzhifu textile science and technology Limited and has the diameter of 20 mu m, the breaking strength of more than or equal to 400MPa, the initial modulus of more than or equal to 3.5GPa and the length of 5 mm.

Further, the vitrified micro bubbles have the granularity of 70-90 meshes and the volume weight of 90-120kg/m ³ 。

Further, the water repellent is a silane-based water repellent, preferably SEAL80 water repellent manufactured by Acksonobel.

Further, the weight ratio of the material A to the material B is 1.

On the other hand, the preparation method of the flexible light leveling mortar comprises the following steps:

1) Mixing the preservative, the defoaming agent and the polymer emulsion in the material A with water according to a proportion;

2) Mixing the raw materials of the material B;

3) And (3) mixing the materials in the steps 1) and 2) in proportion to prepare the flexible light leveling mortar.

In another aspect, the flexible light leveling mortar or the flexible light leveling mortar prepared by the preparation method is applied to the renovation and leveling of old ceramic tiles.

Advantageous effects

(1) According to the invention, the acrylic emulsion with specific viscosity is selected as a main film forming substance in the material A, so that the mortar and the old ceramic tile have strong adhesive force without damaging the old wall body, and the mortar keeps high flexibility and is not easy to bulge, crack or fall off.

(2) The cellulose ether with specific viscosity, high thixotropic anti-sagging property, excellent wetting property and water-retaining property is selected from the material B, and the viscosity-reducing slipping agent is added to further improve the product workability. Wherein the air entraining agent has the functions of reducing the density of the product to improve the smoothness of construction and improve the one-time batch smearing thickness of the product; the starch ether plays a role in quickly thickening, reducing viscosity and preventing sagging; erucamide has the effects of reducing viscosity, having soft hand feeling, being smooth to operate and enabling the surface to be smooth; the polyvinylpyrrolidone has good dispersibility and solubility, has good affinity and bonding force with plastics, metals, ceramic tiles and glass, can provide better initial bonding force with old ceramic tiles after being added, and is also an excipient capable of keeping mortar with a certain plastering thickness. The finally formed mortar has soft and smooth hand feeling, is adhered to a wall, does not stick a bar, is well glazed on the wall, has moderate viscosity and better thixotropy of the whole formula of the mortar, is convenient to perform one-time plastering for 3-10mm without slipping, can be leveled on the bar, is full and continuous after drying, has no knife mark, does not need to be polished, and has the surface meeting the requirements of thick coating construction.

The material B of the invention also specifically selects the fineness of the filler, and the coarse, medium and fine continuous gradation of the high-quality scouring sand greatly increases the thickness of the once plastering of the flexible light leveling mortar, can not crack due to large thickness, and has fine and compact surface;

the vitrified micro bubbles in the material B are expanded perlite micro bubbles with a certain vitrification degree on the surface, have better surface smoothness and sphericity, can form a ball effect by adding the vitrified micro bubbles, can reduce the adhesion of mortar to tools, reduce the volume density of leveling mortar, reduce the dead weight feeling of mortar construction, reduce the drying shrinkage rate of the mortar, have the functions of self adsorption, transportation and moisture release, and are beneficial to the one-time thick smearing and polishing performance of the mortar.

In addition, the addition of the silane-based water repellent in the material B can reduce the viscosity of the mortar, improve the water resistance and freeze-thaw resistance of the mortar and improve the compactness of the mortar, so that the surface is more easily calendered and densified.

(3) The flexible light leveling mortar has improved adhesion, flexibility, leveling property, constructability and decorative effect with the old ceramic tile, and can be used for renovating and leveling the old ceramic tile. Thereby avoiding the phenomena of cracking, bulging and falling caused by insufficient bonding force with the old ceramic tile, insufficient flexibility, insufficient weather resistance, excessive layered interface and the like easily caused by the treatment of the traditional technical measures. The problems that the leveling performance of the traditional technical measures is generally insufficient and the construction process is complicated can be solved.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some embodiments, materials, elements, methods, means, and the like that are well known to those skilled in the art are not described in detail in order to not unnecessarily obscure the present invention.

In the examples of the present invention, the raw materials are commercially available products, for example, the preservative used is a general-purpose liquid in-tank preservative GT of Solel corporation, the defoamer is a mineral oil defoamer NXZ of Kahai chemical industry, the emulsion is an elastic waterproof acrylic emulsion BLJ-953B with a viscosity of 500-1500mPa.s of Shanghai Baulijia chemical industry Co., ltd, the filler is drying scrubbing sand of Chengdu general casting material Co., ltd, and the cellulose ether is cellulose ether Combizell 30011C with a viscosity of 25000-35000mPa.s of Hergassky general chemical industry Co., ltd; the air entraining agent in the viscosity-reducing slipping agent is FLOTAGE AE-1 air entraining agent of Guangdong lake science and technology corporation, starch ether is OPAGEL FP9 starch ether of Netherlands, eruk grass Croda ER-CH, polyvinylpyrrolidone is PVP K30 of Hangzhou Weiqi nanometer material corporation, high-strength fiber is modified polypropylene fiber with the length of 5mm produced by Beijing Zhonghuan textile technology corporation, and the water repellent is SEAL80 silane-based water repellent produced by Akksonobel corporation.

EXAMPLE 1 preparation of Material A

The materials A1, A2 and A3 were prepared respectively by mixing the materials A listed in Table 1.

TABLE 1 preparation formula (wt%) of flexible light leveling mortar material A

Raw material number	Name of raw materials	Material A1	Material A2	Material A3
					1	Water (W)	64.5	59.5	54.5
2	Preservative	0.2	0.2	0.2
					3	Defoaming agent	0.3	0.3	0.3
4	Emulsion and method of making	35	40	45

EXAMPLE 2 preparation of Material B

The raw materials are uniformly mixed according to the following mixture ratio to obtain a material B, wherein the mixture ratio is as follows: 26kg of cement, 5.7 kg of first-grade fly ash, 0.2kg of high-strength fiber, 12 kg of scrubbing sand of 40-70 meshes, 43 kg of scrubbing sand of 70-100 meshes, 8 kg of scrubbing sand of 100-200 meshes, 0.2kg of 30011C cellulose ether, 0.6kg of viscosity-reducing slipping agent, 4kg of vitrified micro bubbles, 0.3kg of SEALA80 silyl water repellent and 100kg of total weight. Wherein 0.6kg of viscosity-reducing slipping agent is prepared according to the following formula: 0.01kg of AE-1 air entraining agent, 0.06kg of FP9 starch ether, 0.2kg of ER-CH erucamide and 0.33kg of K30 polyvinylpyrrolidone.

Example 3 preparation of a Flexible lightweight leveling mortar

The 3 materials A (namely the material A1, the material A2 and the material A3) obtained in the example 1 and the material B obtained in the example 2 are uniformly stirred according to the mass ratio of 1.

TABLE 2 Main Properties of Flexible lightweight leveling mortar

Example 4 comparative experiment

(1) Experimental comparison of different grades of filler, one of the three scouring sands of example 2 was selected for formulation, the other steps were carried out to prepare a flexible lightweight leveling mortar, fully referring to the methods of examples 1-3, and the mortar obtained was compared with the mortar obtained in example 3, with the results shown in table 3. The inventor can well meet the construction requirement of 3-10mm of one-time plastering thickness by continuously grading three meshes, and does not crack; when only coarse sand or medium sand is used, the fineness of the mortar is poor, and the surface can not meet the requirements of coating construction; when only fine sand is used, the leveling property is not enough and the crack is easy to occur.

TABLE 3 Experimental comparison of different grades of fillers

(2) The different viscosities of the emulsion are compared with the test of the leveling mortar, and after the emulsion is mixed with the ordinary portland cement, the mortar can be screened within the construction time of not less than 1 hour; the index detection of the obtained mortar needs to be simultaneously detected by two items in the standard JC/T1017-2006 Polymer emulsion for building waterproof paint: a) Calcium ion stability (0.5% ₂ Solution) has no layering, no precipitation and no flocculation after 48 hours; b) Alkali resistance (0.1% NaOH solution) for 168h without foaming, no festering; and referring to the methods of examples 1 to 3, the flexible lightweight leveling mortar was prepared by changing only the viscosity of the emulsion, and the properties of the obtained flexible lightweight leveling mortar are shown in table 4.

TABLE 4 experimental comparison of different viscosities of emulsions

In the embodiment, the thickness of the mortar is relatively small due to one batch smearing, and the addition amount of the corresponding powder is relatively high, so that certain requirements are imposed on the powder tolerance of the emulsion. The traditional waterproof elastic emulsion is a brushing process in application, has high consistency and very thin construction thickness, so that the powder tolerance of most emulsions is not very high. However, if the powder mixing amount is required to be very high and the consistency is very small during application, the emulsions obviously show the defects of high construction viscosity, obvious thickening, short service time and the like, and cannot be used. Four waterproof emulsions commonly available on the market and emulsions in the examples are selected to test the tolerance of the powder, the powder is prepared by cement and 70-100 mesh scouring sand, and then the powder is mixed with 50% emulsion water solution, the ratio of the powder to the liquid is up to 4. It is clear from the results that not all emulsions achieve such a high powder tolerance, and the emulsions according to the invention are particularly preferred.

TABLE 5 Experimental testing of powder tolerance of different emulsions

(3) Using the methods of examples 1 to 3, only the viscosity of the cellulose ether was varied and the properties of the resulting flexible, lightweight leveling mortars were as shown in Table 6.

TABLE 6 Experimental comparison of different viscosities of cellulose ethers

From Table 6, it is clear that cellulose ethers of 25000 to 35000mPa.s give better flexible, lightweight leveling mortars.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The flexible light leveling mortar is characterized by comprising the following components in percentage by weight of 1: (3-4) a material A and a material B, wherein:

the material A is prepared from the following raw materials in parts by weight: 0.2 to 0.3 weight portion of preservative, 0.2 to 0.3 weight portion of defoaming agent, 40 to 45 weight portions of polymer emulsion and water, wherein the adding amount of the water makes the material A complement to 100 weight portions; the polymer emulsion is waterproof acrylic emulsion; the viscosity of the polymer emulsion is 500-1500mPa.s;

the material B is prepared from the following raw materials in parts by weight: 25 to 30 portions of cement, 5 to 10 portions of fly ash, 60 to 70 portions of filler, 0.15 to 0.25 portion of cellulose ether, 0.5 to 1 portion of viscosity-reducing slipping agent, 0.1 to 0.2 portion of anhydrous superfine high-strength fiber, 3 to 5 portions of vitrified micro bubbles and 0.1 to 0.5 portion of water repellent;

the viscosity-reducing slipping agent comprises the following components in a mass ratio of 0.01-0.02: 0.05 to 0.1:0.1 to 0.3:0.3 to 0.5 of air entraining agent, starch ether, erucic acid amide and polyvinylpyrrolidone;

the filler is scouring sand which comprises 40-70 mesh scouring sand, 70-100 mesh scouring sand and 100-200 mesh scouring sand, and the weight ratio of the scouring sand to the filler is 10-15: 35 to 55:5 to 10;

the cellulose ether is cellulose ether with the viscosity of 25000-35000mPa.s;

the vitrified micro bubbles have the granularity of 70-90 meshes and the volume weight of 90-120kg/m ³ 。

2. The flexible light leveling mortar of claim 1, wherein the material A comprises the following raw materials in parts by weight: 0.2 part of preservative, 0.3 part of defoaming agent and 40-45 parts of polymer emulsion.

3. The flexible light leveling mortar according to claim 1, wherein the material A comprises the following raw materials in parts by weight: 0.2 part by weight of preservative, 0.3 part by weight of defoamer and 45 parts by weight of polymer emulsion.

4. Flexible light leveling mortar according to claim 2, characterized in that in the material A,

the preservative is a universal preservative in the liquid tank;

and/or the defoaming agent is a mineral oil defoaming agent.

5. The flexible light leveling mortar of claim 1, wherein the material B comprises the following raw materials in parts by weight: 26 parts of cement, 5.7 parts of fly ash, 63 parts of filler, 0.2 part of cellulose ether, 0.6 part of viscosity-reducing slipping agent, 0.2 part of high-strength fiber, 4 parts of vitrified micro bubbles and 0.3 part of water repellent.

6. Flexible light leveling mortar according to one of the claims 1 to 5, characterized in that the cement is a Portland cement with a strength rating of 42.5 MPa;

and/or the fly ash is first-grade or second-grade fly ash;

and/or, the high-strength fiber is a modified polypropylene fiber;

and/or the water repellent is a silane-based water repellent.

7. Flexible light leveling mortar according to one of claims 1 to 5, characterized in that the weight ratio of Material A and Material B is 1.

8. The method for preparing the flexible light leveling mortar according to any one of claims 1 to 5 is characterized by comprising the following steps:

2) Mixing the raw materials of the material B;

9. Use of the flexible lightweight leveling mortar according to any one of claims 1 to 7 or prepared by the preparation method according to claim 8 for the renovation of old ceramic tiles.