CN113429171A

Movatterモバイル変換

Info

Publication number: CN113429171A
Application number: CN202010210603.XA
Authority: CN
Inventors: 李向东; 韦利先
Original assignee: Liuzhou Huanbo Building Materials Co ltd
Current assignee: Liuzhou Huanbo Building Materials Co ltd
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2021-09-24

Abstract

The invention discloses wall facing mortar which comprises the following component raw materials of cement, aggregate, latex powder, a water reducing agent, a waterproof agent, an early strength agent, an expanding agent, a defoaming agent and cellulose ether. The invention also provides a preparation method and a use method of the wall veneer.

Description

Wall facing mortar and preparation method and use method thereof

Technical Field

The invention relates to the field of constructional engineering, in particular to wall facing mortar and a preparation method and a use method thereof.

Background

The existing exterior wall finishing materials mainly comprise coatings, real stone paint, ceramic tiles, decorative mortar and the like. The stone-like paint is also called stone-like paint or stone paint, and belongs to the field of synthetic resin emulsion sand wall-like building paint. The paint adopts aggregate and synthetic pigment with certain gradation, and is applied to the wall by a spraying process to achieve the aim of decorating the outer wall. Because of the adoption of the synthetic pigment, the real stone paint has bright color and a large selection range, but has poor color retention performance, and can fade with the passage of time.

Meanwhile, in practical application, the exterior wall coating and the stone paint have some problems in engineering application: if the paint film is thin, the anti-cracking capability is insufficient; easy to stain, especially the elastic coating is easy to stain, and the elasticity and the stain resistance are difficult to balance; easy fading and insufficient durability. Such as: the outer wall engineering pasting of ceramic tiles has some problems: potential safety hazards are caused by temperature difference change and the like; the construction needs a plurality of procedures such as line snapping, row sticking, pointing, cleaning and the like, and the construction cost is high; the decoration effect is not ideal, the color is single, and the renovation is not easy. Such as: the problems of efflorescence, color difference, self-cleaning capability and the like of decorative mortar used in exterior wall engineering.

Disclosure of Invention

The invention aims to provide wall facing mortar with good flexural strength, compressive strength and tensile bonding strength, environmental protection and decoration, and a preparation method and a use method thereof.

The invention discloses wall facing mortar which comprises the following component raw materials of cement, aggregate, latex powder, a water reducing agent, a waterproof agent, an early strength agent, an expanding agent, a defoaming agent and cellulose ether.

Further, the

Further, in the above-mentioned aspect,

further, in the above-mentioned aspect,

further, the cement is any one of portland cement, aluminate cement, sulphoaluminate cement, and aluminate cement blended in portland cement.

Furthermore, the aggregate is more than one of quartz sand, broken stone and colored glaze sand.

Further, the water reducing agent is one of a naphthalene-based high-efficiency water reducing agent and a polycarboxylic acid high-efficiency water reducing agent. Preferably a polycarboxylic acid high-efficiency water reducing agent.

Further, the water repellent is one of silicone and silane group, and most preferably silicone.

Further, the early strength agent is one of calcium formate and anhydrous calcium chloride, and most preferably calcium formate.

Further, the expanding agent is one of ettringite, and ettringite is most preferable. The cellulose ether is one of hydroxypropyl methyl cellulose ethers, most preferably hydroxypropyl methyl cellulose ether.

The application also provides a preparation method of the wall facing mortar, which comprises the following steps: and (3) delivering the cement, the aggregate, the latex powder, the water reducing agent, the waterproof agent, the early strength agent, the expanding agent, the defoaming agent and the cellulose ether which are matched according to the above proportion into a mixer to be fully mixed for 3-5 minutes.

The application also provides a use method of the wall facing mortar, and the wall facing mortar is coated between the primer and the top facing of the wall.

The wall facing mortar disclosed by the invention and the preparation method and the use method thereof have the following effects.

One is ecological. The wall surface has good air permeability and hydrophobicity and similar breathing function.

The second is the physical and mechanical properties. The product has good breaking and compression strength, tensile bonding strength, alkali resistance, stain resistance and weather resistance.

And thirdly, the environment-friendly characteristic. Does not contain volatile organic compounds such as free formaldehyde, benzene and the like, and is a non-toxic, tasteless and green product.

And fourthly, decorative characteristics. Persistent, primitive color, the color can be customized according to the user's requirement. The thickness of the coating layer is generally 1.5-2.5 mm, and excellent texture and three-dimensional decorative effect can be obtained.

Fifthly, the application range characteristic. The construction is simple and efficient, and can be widely applied to new buildings, old building outer wall transformation, villas, rural farmhouses and the like.

Drawings

FIG. 1 is a pressure strength trend chart of mortar by adding a water reducing agent according to the invention.

FIG. 2 is a tendency chart of the flexural strength of the mortar by adding the water reducing agent.

FIG. 3 is a drawing showing the tendency of tensile bond strength of mortar by adding the water reducing agent according to the present invention.

Detailed Description

The invention will be further elucidated and described with reference to specific embodiments and drawings of the specification.

The function of each component in the present solution is further illustrated below.

Cement: as a cementing material, it plays the most critical role in facing mortar, being the main constituent material. The silicate cement, aluminate cement, sulphoaluminate cement or ordinary silicate cement is mixed with a small amount of aluminate cement.

Aggregate: the natural color sand and quartz sand with excellent gradation are adopted to obtain beautiful decorative effect, and the decorative aggregate such as broken stone, colored glaze sand and the like can also be used. The reasonable selection of the aggregate can enable the decorative mortar to obtain better decorative performance, the aggregate gradation and the fineness modulus can influence the plasticity of the mortar and the mechanical property of a hardened body, and the shape of the aggregate particles can also influence the workability of the mortar.

Water reducing agent: the facing mortar has higher fluidity and stability. The good polycarboxylate superplasticizer has relatively good compatibility with different types of cement, can enable concrete and mortar to have high fluidity even at low mixing amount, and has low viscosity and good slump retaining performance at low water-cement ratio. Polycarboxylic acid high-efficiency water reducing agents are preferred in the present application.

Redispersible latex powder: the re-dispersible emulsion powder can be re-dispersed into emulsion quickly after contacting with water, and has the same property with the initial emulsion, namely a film can be formed after water is evaporated, and the film has high flexibility, high weather resistance and high adhesion to various base materials. In addition, the latex powder with hydrophobicity can make the mortar have good waterproofness. The redispersible latex powder is mainly applied to decorative mortar and waterproof mortar external heat-preservation dry-mixed mortar. In the mortar, the weaknesses of the traditional cement mortar such as brittleness, high elastic modulus and the like are improved, the cement mortar has better flexibility and tensile bonding strength to resist and delay the generation of cracks of the cement mortar, and because the polymer and the mortar form an interpenetrating network structure, a continuous polymer film is formed in pores to strengthen the bonding between aggregates and block partial pores in the mortar, the performance of the hardened modified mortar is greatly improved compared with the cement mortar. The redispersible latex powder mainly has the following functions in mortar:

1, the compressive strength and the breaking strength of the mortar are improved.

2 the addition of the latex powder improves the elongation of the mortar, thereby improving the impact toughness of the mortar and simultaneously endowing the mortar with good stress dispersion effect.

3, the bonding property of the mortar is improved. The adhesion mechanism is that macromolecule is adsorbed and diffused on the adhesive surface, and meanwhile, the rubber powder has certain permeability and fully infiltrates the surface of the base material together with the cellulose ether, so that the surface performance of the base material is close to that of the newly plastered surface, the adsorbability is improved, and the performance of the base material is greatly improved.

4, the elastic modulus of the mortar is reduced, the deformation capacity is improved, and the cracking phenomenon is reduced.

5, the wear resistance of the mortar is improved. The improvement of the wear resistance is mainly that a certain amount of the surface of the mortar has the presence of the binder, the rubber powder plays a role in bonding, and a net film structure formed by the rubber powder can penetrate through holes and cracks in the cement mortar. Improves the bonding between the base material and the cement hydration product, thereby improving the wear resistance.

6 endows the mortar with excellent alkali resistance. Product performance of re-dispersible latex powder

-improving the bending strength and bending strength of mortar

The polymer adhesive film formed by the redispersible latex powder has good flexibility. Forming a film in gaps and surfaces of cement mortar particles to form flexible connection. So that brittle and hard cement mortar becomes elastic. The mortar added with the redispersible latex powder is several times higher than the common mortar in tensile and bending resistance.

-improving the adhesive strength and cohesion of mortar

After the redispersible latex powder used as the organic binder is formed into a film, high tensile strength and bonding strength can be formed on different base materials. Plays an important role in the binding force of the mortar and the base material with the smooth surface of the organic material. The polymer rubber powder for film formation is used as a reinforcing material to be distributed in the whole mortar system, so that the cohesion of the mortar is increased.

-improving the impact resistance, durability and abrasion resistance of mortar

The hole cavity of the mortar is filled, the compactness of the mortar is increased, and the wear resistance is improved. The relaxation can be generated under the action of external force without being damaged. The polymer adhesive film can be permanently stored in the mortar system.

-improving the weatherability, freeze-thaw resistance and preventing cracking of mortar

The redispersible latex powder belongs to thermoplastic resin, has good flexibility, can make the mortar respond to external cold and hot environmental changes, and effectively prevents the mortar from cracking due to the change of temperature difference.

Increasing hydrophobicity and reducing water absorption of mortar

The redispersible latex powder forms a film on the cavity and the surface of the mortar, and the polymer adhesive film can not be dispersed for the second time after meeting water, thereby preventing the invasion of water and improving the impermeability. The special redispersible emulsion powder with the hydrophobic effect has better hydrophobic effect.

The lubricating effect among the polymer rubber powder particles for improving the construction workability of the mortar can be improved, so that the mortar components can flow independently, and the rubber powder has an induction effect on air, thereby giving the compressibility to the mortar and improving the construction workability of the mortar.

The preferred waterproofing agent in this application is organosilicon waterproofing powder: the method is used for a use scheme with the best effect on dry-mixed mortar, and determines the best mixing ratio, so that the dry-mixed mortar has good working performance, mechanical property and durability; on the basis, the waterproof mechanism of the organosilicon waterproofing agent is known by a microscopic testing method (X-ray diffraction, infrared spectrum, scanning electron microscope, atomic force microscopy and the like), and the theoretical basis of the organosilicon waterproof reaction is perfected. The comprehensive performance index tests comprise water absorption capacity, breaking and compression strength, bonding strength, freeze-thaw cycle, heat resistance, alkali resistance, dry shrinkage and the like. The organic silicon waterproof agent is applied to dry-mixed mortar, and has effective waterproof performance, the water absorption of the mortar can be reduced by 90 percent to the maximum extent, and the waterproof rate of the organic silicon waterproof agent is not increased along with the increase of the mixing amount, but has a proper mixing amount point.

Early strength agent: the main function is to accelerate the hydration speed of the cement and promote the development of the early strength of the mortar; not only has the early strength function, but also has certain water reducing and enhancing functions.

Swelling agent: the material is mainly used for compensating the shrinkage of the material in the hardening process and preventing cracking.

Defoaming agent: defoaming the mortar, and eliminating bubbles formed by stirring when the high polymer material is introduced or mixed. The defoaming agent eliminates closed bubbles in the mortar, thereby improving the pore structure of the mortar and reducing the void ratio of the mortar. The defoaming agent can effectively control the air content of the mortar, and the proper air content in the mortar can improve the workability of the mortar and improve the performances of impermeability, frost resistance, durability and the like.

Cellulose ether: the facing mortar has good water retention and thickening effects, the workability of the mortar can be obviously improved, and the surface dusting caused by incomplete cement hydration due to water shortage of the mortar in the using process can be avoided, so that the structural strength of the mortar is greatly enhanced, and the viscosity of the mortar is obviously improved. The cellulose ether can improve the workability of the mortar and also can influence the structure and the performance of the mortar. The improvement of the workability of the exterior wall decoration mortar by the cellulose ether is mainly reflected in the aspects of water retention, sag resistance, operation time and the like, and the construction speed is improved by improving the tensile bonding strength of the mortar. In addition, the interaction of the cellulose ether and a cement system has the functions of air entraining, delayed coagulation and the like on the mortar. Preferably, hydroxypropyl methylcellulose ether.

Example 1

Example 2

Example 3

Example 1 analysis of Properties

Example 2 analysis of Properties

Example 3 analysis of Properties

The effect of the individual main components on the properties of the product is explained in detail below.

1. Effect of Water reducing Agents on decorative mortar Properties

The high-efficiency water reducing agent is doped in the mortar, so that the water-cement ratio can be obviously reduced, and the better fluidity of the mortar is kept. The dispersing effect of the water reducing agent is beneficial to the growth of a fine structure of the set cement, and the pore distribution condition of the set cement is changed to different degrees, so that macropores are reduced, and the set cement is more compact. Therefore, the water reducing agent improves some physical and mechanical properties of the mortar, improves the durability and enhances the chemical erosion resistance.

Firstly, through experimental study, the influence of the naphthalene-based acid high-efficiency water reducing agent on the consistency loss of the mortar is shown in table 1, the influence of the mixing amount of the polycarboxylic acid high-efficiency water reducing agent on the water-cement ratio of the mortar is shown in table 2, and secondly, the influence of the mixing amount of the naphthalene-based acid high-efficiency water reducing agent and the polycarboxylic acid high-efficiency water reducing agent on the mechanical property of the mortar is analyzed.

TABLE 1 influence of naphthalene-based acid superplasticizer on mortar consistency loss

As can be seen from Table 1, the consistency is controlled to 95. + -.5 mm under substantially the same initial consistency of the mortar. When the content of the naphthalene-based superplasticizer is more than 0.7%, the loss of the consistency of the mortar is relatively small with the lapse of time, and the change of the consistency is slow within 60 min. When the blending amount of the naphthalene-based superplasticizer is 1.2 percent, the loss of the mortar consistency in 100min is 8mm, the loss in all different blending amounts is the minimum in time, and no obvious layering and segregation phenomenon occurs. Therefore, the optimal mixing amount of the water reducing agent is determined to be about 1.2 percent.

TABLE 2 influence of the polycarboxylate superplasticizer on the water-cement ratio of the mortar

As can be seen from Table 2, under the condition of basically the same consistency, the water-cement ratio of the mortar can be remarkably reduced by adding the polycarboxylic acid high-efficiency water reducing agent, because the molecular structure of the polycarboxylic acid high-efficiency water reducing agent has a stronger hydration film lubricating and water reducing effect, and a large amount of carboxyl groups, hydroxyl groups and ether groups in the polycarboxylic acid water reducing agent molecule have stronger liquid-gas interface activity, so that a certain air-entraining isolation ball water reducing effect is achieved. However, when the amount of the water reducing agent added is increased to a certain level, the rate of decrease in the water-cement ratio begins to decrease. As can be seen from the data in the table, when the mixing amount of the water reducing agent is 1.2%, the reduction rate of the water-cement ratio is the largest, and the water retention is the best, which is the same as the result of the loss test over time, and the proper mixing amount of the polycarboxylic acid high-efficiency water reducing agent can be determined to be 1.2%.

The thickness of the mortar is controlled to be 95 +/-5 mm in the test process. The basic mix proportion of the test is as follows: c: S: W: Sup ═ 1: 2: W: Sup, and the test results are shown in Table 3 and FIGS. 1, 2 and 3.

TABLE 3 influence of the blending amount of the polycarboxylic acid high-efficiency water reducing agent on the mechanical properties of the mortar

TABLE 4 influence of naphthalene series water reducer doping amount on mortar mechanical properties

As can be seen from Table 3 and Table 4, under the condition of basically the same consistency, the water-cement ratio of the mortar can be remarkably reduced by adding the polycarboxylic acid high-efficiency water reducing agent, because the molecular structure of the polycarboxylic acid high-efficiency water reducing agent has a stronger hydration film lubricating and water reducing effect, and a large amount of carboxyl groups, hydroxyl groups and ether groups in the polycarboxylic acid water reducing agent have stronger liquid-gas interface activity, so that a certain air-entraining isolation "ball" water reducing effect is achieved. However, when the amount of the water reducing agent added is increased to a certain level, the rate of decrease in the water-cement ratio begins to decrease. As can be seen from the data in the table, when the mixing amount of the water reducing agent is 1.2%, the reduction rate of the water-cement ratio is the largest, the water retention is the best, and the result of the time-dependent loss test is the same, so that the proper mixing amount of the polycarboxylic acid high-efficiency water reducing agent can be determined to be 1.2%.

The test analyzes the influence of the mixing amount of the water reducing agent on the mechanical property of the mortar, and the consistency of the mortar is controlled to be 95 +/-5 mm in the test process. The basic mix proportion of the test is as follows: c: S: W: Sup ═ 1: 2: W: Sup, and the test results are shown in Table 5 and FIGS. 1, 2 and 3.

TABLE 5 influence of the amount of water-reducing agent incorporated on the mechanical Properties of the mortar

Along with the increase of the mixing amount of the water reducing agent, the compressive strength and the flexural strength of the mortar are gradually increased. This is because the strength of the mortar is increased as the water-reducing agent content is increased, because the water-cement ratio of the mortar is gradually decreased. As can be known from FIG. 3, with the increase of the mixing amount of the polycarboxylate superplasticizer, the tensile bond strength of the mortar is gradually increased and reaches the maximum value when the mixing amount is 1.2%, the 7d strength reaches 0.63MPa, and the 28d strength reaches 0.84MPa, which are all higher than the standard requirement of 0.5 MPa. The tensile bonding strength is a main consideration factor of the decorative mortar, and when the mixing amount of the water reducing agent is 1.2%, the 7d compressive strength of the mortar is 18.09MPa, which is far greater than 4.5MPa required by the standard, and the 7d flexural strength is 3.79MPa, which is also greater than 2.5MPa required by the standard. From strength analysis, the optimal mixing amount of the mortar is 1.2%.

As can be seen from Table 5, the fracture ratio of the mortar increased and the toughness decreased after the use of the water reducing agent. The toughness is best when the mixing amount is 0.5% and 1.2%, but when the mixing amount of the water reducing agent is 0.5%, the performances of the mortar such as compression resistance, flexural strength and tensile bond strength are not excellent when the mixing amount is 1.2%, so that 1.2% is selected as the best mixing amount.

2. Influence of redispersible latex powder mixing amount on decorative mortar performance

The polymer rubber powder is doped into the mortar, so that the cohesion, cohesion and structural strength of the freshly mixed mortar can be improved, and the mortar has better plastering construction performance. The polymer rubber powder can also improve the toughness, the bonding strength, the crack resistance and the durability of the mortar.

The basic mixing ratio of the test is as follows: c: S: W: P: Sup: 1: 2: 0.29: P: 1.2% (P is the mixing amount of the rubber powder and is calculated by the mass percentage of the cement), the test results are shown in Table 6, and FL represents the mortar consistency value measured in the test.

TABLE 6 influence of redispersible latex powders on mortar mechanical properties

As can be seen from Table 6, the compressive strength of the mortar gradually decreased as the amount of the latex powder was increased. The mortar has the air entraining function, more air bubbles are introduced, and the compressive strength of the mortar is reduced due to the poor structure of the air bubbles; in addition, because the added rubber powder can form a polymer network structure system in a cement structure, the elasticity modulus of the polymer network structure system is lower than that of cement, and the polymer network structure system cannot play a rigid supporting role when the composite system is pressed. The minimum value of the compressive strength measured in the test is 12.95MPa, which is higher than the standard required value of 4.5MPa, and the use of the decorative mortar is not adversely affected. Moreover, the adverse effect of the rubber powder on the compressive strength of the mortar is reduced by adding the defoaming agent in subsequent tests.

The addition of the redispersible latex powder improves the flexural strength of the mortar, and the maximum value of the flexural strength is 5.09MPa and is 2.5MPa greater than the standard required value; the tensile bonding strength of the interface is obviously improved, and the maximum value is 1.75MPa when the doping amount is 3 percent, and the maximum value is far more than the standard required value of 0.5 MPa. In the test, the latex powder is re-dispersed into emulsion after being mixed with water in the mortar, and is uniformly dispersed in the cement slurry. The polymer particles in the emulsion can be adsorbed on hydration products and unhydrated cement particles, and free water in the mortar is gradually reduced along with the hydration of the cement, so that the hydration products are increased continuously. The polymer particles fuse together to form a polymer film, and finally the polymer film forms a continuous network structure and interweaves with cement hydrate. The film layer has higher deformability, so that cement hydration products and aggregates are mutually cemented to form a polymer interpenetrating network, pores among the cement hydration products are filled, microcracks on the interface of the aggregates and cement paste are reduced, and the performances of tensile bonding strength, breaking strength and the like of the interface of the mortar are improved.

As can be seen from Table 6, in the range of the amount of the latex powder less than 3%, the consistency of the mortar gradually increases with the increase of the amount of the latex powder, and beyond this range, the consistency of the mortar begins to decrease. The addition of latex powder can improve the fluidity of the mortar because the addition of the rubber powder can increase the air content of the mortar, and the air bubbles have the effect similar to a ball, so that the fluidity of the mortar is increased.

3. Influence of cellulose ether mixing amount on decorative mortar performance

In order to provide good flexibility and workability to the mortar to improve the wall-mounting performance of the mortar, some water-retaining and thickening materials are usually added to the mortar, and cellulose ether is one of the commonly used water-retaining and thickening materials. The basic mixing ratio of the test is as follows: c: S: W: CE: Sup: 1: 2.0: 0.29: CE: 1.2% (CE is the amount of cellulose ether added, calculated as the percentage of cement mass); the test results are shown in Table 7, and FL represents the mortar consistency value measured in the test.

TABLE 7 influence of cellulose ethers on mechanical Properties of mortars

From table 7, it can be seen that the compressive strength of the mortar is obviously reduced after the cellulose ether is doped, and the reduction amplitude of the compressive strength is increased along with the increase of the doping amount of the cellulose ether. The flexural strength of the mortar is increased when the mixing amount is small, and then is gradually reduced along with the increase of the mixing amount. On one hand, the cellulose ether is doped into the cement paste to form a flexible polymer system in a cement structure, and the flexible polymer system cannot play a rigid supporting role when the composite system is compressed, so that the compression strength and the flexural strength of the mortar are reduced; on the other hand, during the mixing hydration of the mortar, the cellulose ether latex particles can form polymer films to wrap the surfaces of the cement particles, so that the hydration of the cement is incomplete, and the strength of the mortar is reduced. The lowest value of the compression strength measured in the test is 15.72MPa, which is far more than 4.5MPa required by the standard. Therefore, better control of the amount of cellulose ether incorporated during the test can reduce this adverse effect very well.

As can be seen from Table 7, the interfacial tensile bond strength of the mortar is significantly increased by the incorporation of the cellulose ether. And the strength is gradually increased along with the increase of the mixing amount of the cellulose ether, and reaches the maximum value of 1.2MPa when the mixing amount is 0.15 percent, which is far more than 0.5MPa required by the standard. The cellulose ether mainly plays roles in retaining water, thickening and improving workability in the mortar. The water retention performance of the mortar can be obviously improved by using a small amount of cellulose ether, so that enough water is stored in the mortar, the hydration hardening of cement and the complete development of the strength of the cement are ensured, and the tensile bonding strength of cement paste is improved; in addition, the cellulose ether can improve the wet viscosity of the mortar and has better viscosity on various base materials, thereby improving the wall-mounting performance of the decorative mortar.

It can also be seen from table 7 that the consistency of the mortar gradually decreases with increasing amount of cellulose ether. When the mortar viscosity is too high, workability is poor and the tendency to improve mortar properties is also slowed down. Therefore, the reasonable selection of the mixing amount of the cellulose ether in the test is very important.

The mortar provided by the application has the following characteristics.

The main components of the decorative mortar are cement, aggregate, inorganic pigment and various additives. Compared with the real stone paint, the natural inorganic pigment is adopted, so that the color selection range is not wide as that of the real stone paint, but the color-holding performance is far better than that of the real stone paint, and the phenomena of fading and the like can not occur along with the lapse of time. Meanwhile, the durability is undoubted, the material has excellent aging resistance under the influence of natural weather conditions, does not stick ash, and can ensure that the building facade is new for a long time. Compared with stone-like paint, the construction of the decorative mortar is simple and easy to control, and mainly comprises base layer treatment, priming paint coating, facing mortar wall mounting and roller coating of overlay.

It should be noted that the above embodiments are only for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. The wall facing mortar is characterized by comprising the following component raw materials of cement, aggregate, latex powder, a water reducing agent, a waterproof agent, an early strength agent, an expanding agent, a defoaming agent and cellulose ether.

2. The wall finishing mortar of claim 1, wherein the mortar is applied to a wall

3. The wall finishing mortar of claim 2,

4. the wall finishing mortar of claim 3,

5. the wall finishing mortar of claim 1, wherein the cement is any one of portland cement, aluminate cement, sulphoaluminate cement, or aluminate cement blended with portland cement.

6. The wall finishing mortar of claim 1, wherein the aggregate is one or more of quartz sand, crushed stone, and colored glaze sand.

7. The wall finishing mortar of claim 1, wherein the water reducing agent is one of a naphthalene based water reducing agent and a polycarboxylic acid water reducing agent.

8. The wall finishing mortar of claim 1, wherein the water repellent is one of silicone and silane based; the early strength agent is one of calcium formate and anhydrous calcium chloride; the expanding agent is one of ettringite; the cellulose ether is hydroxypropyl methyl cellulose ether.

9. The preparation method of the wall facing mortar is characterized by comprising the following steps: the cement, aggregate, latex powder, water reducing agent, waterproof agent, early strength agent, expanding agent, defoaming agent and cellulose ether which are matched according to the proportion of claims 1-8 are fed into a mixer to be fully mixed for 3-5 minutes.

10. A method of using a wall finishing mortar, characterized in that the wall finishing mortar according to any one of claims 1-8 is applied between the primer and the finish of a wall surface.