Composition for mortar, mortar as well as preparation method and application of mortar

Abstract

The invention relates to the field of decorative mortar materials, and discloses a composition for mortar, the mortar and a preparation method and application of the mortar. Based on the total weight of the composition, the composition is prepared from the following components in percentage by weight: 18 to 28 percent of cement, 10 to 20 percent of filler, 55 to 70 percent of quartz sand, 0.1 to 0.3 percent of cellulose ether, 0.02 to 0.05 percent of starch ether and 0.02 to 0.04 percent of thixotropic lubricant. On the premise that a leveling process is not carried out before coating, the decorative mortar disclosed by the invention can have excellent compatibility and bonding strength with an outer wall matrix.

Description

Technical Field

[0001] The invention relates to the field of decorative mortar materials, and in particular to a mortar composition, mortar, and a preparation method and application thereof. Background Art

[0002] In recent years, the main construction methods for wall decoration at home and abroad are: plastering + anti-cracking + putty + real stone paint / coating, etc. The leveling layer and the decorative layer are constructed in multiple steps. There are many processes and the structural layer is a combination of inorganic and organic materials, which leads to poor compatibility between the structural layer materials. The putty and paint / real stone paint layers are prone to bulging and peeling, and the service life is relatively short.

[0003] CN110317023A discloses a diatom mud decorative material and a preparation method thereof, comprising the following components in parts by weight: 100-400 parts of diatomite; 10-70 parts of white cement; 150-400 parts of heavy calcium; 150-400 parts of lime calcium; 80-250 parts of quartz sand; 2-10 parts of thixotropic lubricant; 10-70 parts of dispersible latex powder; 650-850 parts of water. It also optionally comprises the following components in parts by weight: 5-40 parts of titanium dioxide; 1-7 parts of mildewproof agent; 1-5 parts of starch ether; 0.1-2 parts of dispersant; 2-10 parts of polyvinyl alcohol; 2-6 parts of inorganic pigment; 3-15 parts of cellulose ether; 1-6 parts of wood fiber. The diatom mud decorative material of the invention is a green, environmentally friendly, health-care, breathable, waterproof and mildew-proof diatom mud decorative material with a wide source of raw materials, low cost, stable performance and long-term storage. However, this material can only be used for thin-layer decoration construction. It cannot be used for thick-layer decoration construction without leveling the base layer, and this material is not water-resistant. Summary of the invention

[0004] The purpose of the invention is to solve the problem in the prior art that the decorative mortar cannot be directly used for decorative construction under the premise of uneven base.

[0005] In order to achieve the above object, the first aspect of the present invention provides a mortar composition, which contains, based on the total weight of the composition, 18wt%-28wt% of cement, 10wt%-20wt% of filler, 55wt%-70wt% of quartz sand, 0.1wt%-0.3wt% of cellulose ether, 0.02wt%-0.05wt% of starch ether and 0.02wt%-0.04wt% of thixotropic lubricant;

[0006] The cellulose ether is methyl hydroxypropyl cellulose ether, and the viscosity of the methyl hydroxypropyl cellulose ether at 25° C. is 3500 mPa·s-4000 mPa·s;

[0007] The cement is 42.5 grade white cement.

[0008] A second aspect of the present invention provides a method for preparing mortar, the method comprising: mixing water and the composition described in the first aspect to obtain mortar;

[0009] The mass ratio of the composition to the water is 1:0.1-0.2.

[0010] The third aspect of the present invention provides mortar prepared by the method described in the second aspect.

[0011] The fourth aspect of the present invention provides the use of the mortar described in the third aspect in decorative coatings.

[0012] The present invention has at least the following advantages:

[0013] (1) The mortar composition provided by the present invention solves the problem that decorative construction can be directly carried out even when the base layer is uneven. At the same time, the mortar product prepared from the mortar composition takes into account the integrated effects of leveling and decoration, achieving a technological breakthrough in traditional decorative surface layers.

[0014] (2) The decorative mortar of the present invention has good compatibility with the exterior wall substrate, high compressive and flexural strength, and excellent bonding strength, and can effectively avoid the problems of hollowing and falling of the decorative mortar.

[0015] (3) Compared with traditional decorative mortar, the decorative mortar of the present invention can save the complicated rough and fine leveling process of the base surface when used in construction, thus greatly improving the construction efficiency and shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a picture of the mortar prepared in Example 1 of the present invention after being coated on an exterior wall substrate. DETAILED DESCRIPTION

[0017] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0018] As mentioned above, the first aspect of the present invention provides a mortar composition, which contains, based on the total weight of the composition, 18wt%-28wt% of cement, 10wt%-20wt% of filler, 55wt%-70wt% of quartz sand, 0.1wt%-0.3wt% of cellulose ether, 0.02wt%-0.05wt% of starch ether and 0.02wt%-0.04wt% of thixotropic lubricant;

[0019] The cellulose ether is methyl hydroxypropyl cellulose ether, and the viscosity of the methyl hydroxypropyl cellulose ether at 25° C. is 3500 mPa·s-4000 mPa·s;

[0020] The cement is 42.5 grade white cement.

[0021] Preferably, based on the total weight of the composition, the composition contains 18wt%-28wt% of cement, 12wt%-20wt% of filler, 55wt%-62wt% of quartz sand, 0.1wt%-0.2wt% of cellulose ether, 0.02wt%-0.03wt% of starch ether and 0.02wt%-0.03wt% of thixotropic lubricant. The inventors of the present invention have found that under this preferred condition, the mortar prepared by the mortar composition of the present invention has better compatibility with the exterior wall substrate and has better bonding strength and flexural and compressive strength.

[0022] Preferably, the particle size of the quartz sand is ≤1.18 mm. The inventors of the present invention have found that under this preferred condition, the decorative mortar prepared by the mortar composition of the present invention has better bonding strength and flexural strength with the exterior wall substrate.

[0023] Preferably, based on the total weight of the white cement, the white cement contains 20wt%-23wt% of silicon dioxide, 4wt%-8wt% of aluminum oxide, and 64wt%-67wt% of calcium oxide. The inventors of the present invention have found that under this preferred condition, the decorative mortar of the present invention has better compatibility with the exterior wall substrate and has better bonding strength.

[0024] It should be noted that the white cement used in the present invention also contains a small amount of impurities such as iron oxide, magnesium oxide and sodium oxide.

[0025] Preferably, the starch ether is hydroxypropyl starch ether and / or hydroxyethyl starch ether. Exemplarily, the starch ether is selected from at least one of starch ether FP6, starch ether 301, and starch ether KH6.

[0026] More preferably, the starch ether is hydroxypropyl starch ether.

[0027] Preferably, the filler is heavy calcium and / or quartz powder, and the average particle diameter of the filler is 60 μm-70 μm.

[0028] Preferably, the thixotropic lubricant is a magnesium aluminum silicate thixotropic lubricant. Exemplarily, the thixotropic lubricant is thixotropic lubricant 602.

[0029] As mentioned above, the second aspect of the present invention provides a method for preparing mortar, the method comprising: mixing water and the composition described in the first aspect to obtain mortar;

[0030] The mass ratio of the composition to the water is 1:0.1-0.2.

[0031] Preferably, the mixing operation comprises: firstly stirring the components in the composition described in the first aspect to obtain a mixture I; and then first mixing the mixture I with water to obtain a mortar.

[0032] The present invention has no particular requirements for the first mixing and the stirring methods, and those skilled in the art can select them according to conventional methods, which should not be construed as limiting the present invention. Exemplarily, the stirring conditions include: a temperature of 20-30° C., a time of 1-10 min, and a stirring speed of 40-70 r / min.

[0033] As mentioned above, the third aspect of the present invention provides mortar prepared by the method described in the second aspect.

[0034] As mentioned above, the fourth aspect of the present invention provides the use of the mortar described in the third aspect in decorative coatings.

[0035] According to a particularly preferred embodiment, the present invention provides a construction method for mortar for decorative coatings, comprising: spraying or scraping the mortar on an exterior wall substrate to obtain a decorative mortar surface; then sanding the surface of the decorative mortar surface to form a velvet surface; and then coating a covering agent on the surface of the velvet surface.

[0036] The present invention has no special requirements for the sand rubbing treatment method, and those skilled in the art can select it according to conventional methods in the art, which should not be construed as a limitation to the present invention.

[0037] In the following examples, unless otherwise specified, the raw materials involved are all commercially available products.

[0038] 42.5 grade white cement: the content of silicon dioxide in the white cement is 20wt%-23wt%, the content of aluminum oxide is 4wt%-8wt%, and the content of calcium oxide is 64wt%-67wt%, model PWI 42.5, purchased from Jiangxi Yinshan Materials Co., Ltd.

[0039] Quartz sand 1: particle size ≤1.18mm.

[0040] Quartz sand 2: particle size range is 1.2mm-2.36mm.

[0041] Cellulose ether A: methyl hydroxypropyl cellulose ether, with a viscosity of 3500-4000 mPa·s at 25° C., model number Tianpu HK4M, purchased from Tianpu Materials Co., Ltd.

[0042] Cellulose ether B: methyl hydroxypropyl cellulose ether, with a viscosity of 7000-8000 mPa·s at 25° C., model GMC1615, purchased from Shanghai Huiguang Materials Co., Ltd.

[0043] Starch ether: Hydroxypropyl starch ether, model starch ether 301, purchased from BYK Materials Co., Ltd.

[0044] Thixotropic lubricant: Thixotropic lubricant model 602, purchased from Avibe Materials Co., Ltd.

[0045] Heavy calcium: The average particle diameter is 70 μm and it was purchased from Jiangxi Guangyuan Materials Co., Ltd.

[0046] Example 1

[0047] This example is used to illustrate that the mortar of the present invention is prepared according to the formula of the mortar composition in Table 1 and the method described below.

[0048] The method for preparing the mortar comprises the following steps:

[0049] (1) stirring cement, filler, quartz sand, cellulose ether, starch ether and thixotropic lubricant to obtain a mixture I;

[0050] The stirring conditions are as follows: temperature of 23°C, time of 3 min, stirring speed of 60 r / min;

[0051] (2) mixing the mixture I with water in a weight ratio of 1:0.18 to obtain a mortar, named S1;

[0052] The first mixing conditions are: temperature of 23° C., time of 3 min, and stirring speed of 60 r / min.

[0053] Unless otherwise specified, the remaining examples and comparative examples were carried out in the same manner as in Example 1, except that the formulas of the mortar compositions used were different, see Table 1 for details.

[0054] Table 1

[0055]

[0056] Table 1

[0057]

[0058]

[0059] Test example:

[0060] The prepared mortar (S1, S2, S3, S4, DS1, DS2, DS3, DS4 or DS5) is sprayed or scraped on the exterior wall substrate to obtain a decorative mortar surface with a thickness of 20 mm; then the surface of the decorative mortar surface is sanded to form a velvet surface; and then a 0.1 mm thick covering agent is applied to the velvet surface. Figure 1 This is a picture after mortar S1 is coated on the exterior wall substrate.

[0061] The decorative mortar coated on the exterior wall substrate was tested according to the standard JC / T 1024-2019 "Wall Finishing Mortar", and the experimental results are shown in Table 2.

[0062] Table 2

[0063]

[0064] It can be seen from the above results that the decorative mortar of the present invention has excellent compatibility with the exterior wall substrate and good bonding strength under the condition that no leveling process is performed before applying the mortar.

[0065] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A mortar composition, characterized in that: Based on the total weight of the composition, the composition contains 18wt%-28wt% of cement, 10wt%-20wt% of filler, 55wt%-70wt% of quartz sand, 0.1wt%-0.3wt% of cellulose ether, 0.02wt%-0.05wt% of starch ether and 0.02wt%-0.04wt% of thixotropic lubricant; The cellulose ether is methyl hydroxypropyl cellulose ether, and the viscosity of the methyl hydroxypropyl cellulose ether at 25° C. is 3500 mPa·s-4000 mPa·s; The cement is 42.5 grade white cement.

2. The composition according to claim 1, characterized in that Based on the total weight of the composition, the composition contains 18wt%-28wt% of cement, 12wt%-20wt% of filler, 55wt%-62wt% of quartz sand, 0.1wt%-0.2wt% of cellulose ether, 0.02wt%-0.03wt% of starch ether and 0.02wt%-0.03wt% of thixotropic lubricant.

3. The composition according to claim 1 or 2, characterized in that The particle size of the quartz sand is ≤1.18 mm.

4. The composition according to claim 1 or 2, characterized in that Based on the total weight of the white cement, the white cement contains 20wt%-23wt% of silicon dioxide, 4wt%-8wt% of aluminum oxide, and 64wt%-67wt% of calcium oxide.

5. The composition according to claim 1 or 2, characterized in that The starch ether is hydroxypropyl starch ether and / or hydroxyethyl starch ether.

6. The composition according to claim 1 or 2, characterized in that The filler is heavy calcium and / or quartz powder, and the average particle diameter of the filler is 60 μm-70 μm; And / or, the thixotropic lubricant is a magnesium aluminum silicate thixotropic lubricant.

7. A method for preparing mortar, characterized in that: The method comprises: mixing water and the composition according to any one of claims 1 to 6 to obtain mortar; The mass ratio of the composition to the water is 1:0.1-0.

2.

8. The method according to claim 7, characterized in that The mixing operation comprises: firstly stirring the components in the composition according to any one of claims 1 to 6 to obtain a mixture I; and then first mixing the mixture I with water to obtain a mortar.

9. Mortar prepared by the method according to claim 7 or 8.

10. Use of the mortar according to claim 9 in decorative coatings.

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