A composition for mortar, mortar and a method of preparing and using the same

Abstract

The present application relates to the field of decorative mortar material, and discloses a mortar composition, mortar, and a preparation method and application thereof. 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, based on the total weight of the composition. The decorative mortar of the present application can have excellent compatibility and bonding strength with the outer wall matrix without leveling process before coating.

Description

TECHNICAL FIELD

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

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

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

[0004] The purpose of the present application is to solve the problem that the existing decorative mortar cannot directly perform decoration construction under the premise that the base layer is uneven.

[0005] To achieve the above-mentioned purpose, the first aspect of the present application provides a mortar composition, which 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, based on the total weight of the composition;

[0006] The cellulose ether is a methylhydroxypropyl cellulose ether, and the viscosity of the methylhydroxypropyl cellulose ether at 25℃ is 3500mPa·s-4000mPa·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 of 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 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 of being able to directly carry out decorative construction 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, which can effectively avoid the problems of hollowing and falling of the decorative mortar.

[0015] (3) Compared with traditional decorative mortars, the decorative mortar of the present invention can save the tedious rough and fine leveling process of the base surface when used in construction, thereby 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 the exterior wall substrate. DETAILED DESCRIPTION

[0017] The endpoints of the ranges and any values ​​disclosed herein 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 endpoints of each range, the endpoints of each range and 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 to be specifically disclosed herein.

[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 a thixotropic lubricant;

[0019] The cellulose ether is a methylhydroxypropyl cellulose ether, and the viscosity of the methylhydroxypropyl cellulose ether at 25℃ is 3500 mPa·s-4000 mPa·s.

[0020] The cement is a 42.5-grade white cement.

[0021] Preferably, the cement in the composition is 18wt%-28wt%, the filler is 12wt%-20wt%, the quartz sand is 55wt%-62wt%, the cellulose ether is 0.1wt%-0.2wt%, the starch ether is 0.02wt%-0.03wt%, and the thixotropic lubricant is 0.02wt%-0.03wt%, based on the total weight of the composition. The inventors of the present application have found that, under the preferred conditions, the mortar prepared using the mortar composition of the present application has better compatibility with the external wall substrate, and has more excellent bonding strength, bending strength and compressive strength.

[0022] Preferably, the particle size of the quartz sand is ≤1.18mm. The inventors of the present application have found that, under the preferred conditions, the decorative mortar prepared using the mortar composition of the present application has more excellent bonding strength and bending strength with the external wall substrate.

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

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

[0025] Preferably, the starch ether is a hydroxypropyl starch ether and / or a hydroxyethyl starch ether. Illustratively, 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 a hydroxypropyl starch ether.

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

[0028] Preferably, the thixotropic lubricant is a magnesium aluminum silicate-based thixotropic lubricant. Illustratively, the thixotropic lubricant is thixotropic lubricant 602.

[0029] The second aspect of the present application provides a method for preparing a mortar, which comprises mixing the composition of the first aspect with water to obtain the mortar.

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

[0031] Preferably, the mixing comprises stirring the components of the composition of the first aspect to obtain a mixture I, and then mixing the mixture I with water to obtain the mortar.

[0032] The method for the mixing and the stirring is not particularly limited in the present application, and can be selected according to conventional methods by those skilled in the art, and should not be construed as a limitation of the present application. Illustratively, the stirring conditions include a temperature of 20-30℃, a time of 1-10 min, and a stirring speed of 40-70 r / min.

[0033] The third aspect of the present application provides the mortar prepared by the method of the second aspect.

[0034] The fourth aspect of the present application provides the use of the mortar of the third aspect in decorative coatings.

[0035] According to a particularly preferred embodiment, the present application provides a method for applying a mortar in decorative coatings, which comprises spraying or troweling the mortar on an outer wall base to obtain a decorative mortar surface, then sanding the surface of the decorative mortar surface to form a velvet surface, and then coating a finish agent on the surface of the velvet surface.

[0036] The method for the sanding is not particularly limited in the present application, and can be selected according to conventional methods by those skilled in the art, and should not be construed as a limitation of the present application.

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

[0038] White cement 42.5: the content of silicon dioxide in the white cement is 20wt%-23wt%, the content of aluminum oxide is 4wt%-8wt%, the content of calcium oxide is 64wt%-67wt%, and the type is PWI 42.5, which is purchased from Jiangxi Yinsen Material Co., Ltd.

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

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

[0041] Cellulose ether A: methyl hydroxypropyl cellulose ether, viscosity at 25℃ is 3500-4000 mPa-s, model number is TUP HK4M, purchased from TUP Material Co., Ltd.

[0042] Cellulose ether B: methyl hydroxypropyl cellulose ether, viscosity at 25℃ is 7000-8000 mPa-s, model number is GMC1615, purchased from Shanghai Hui Guang Material Co., Ltd.

[0043] Starch ether: hydroxypropyl starch ether, model number is Starch Ether 301, purchased from BYK Material Co., Ltd.

[0044] Thixotropic lubricant: model number is Thixotropic Lubricant 602, purchased from AVEBE Material Co., Ltd.

[0045] Heavy calcium: the average particle diameter is 70 μm, purchased from Jiangxi Guangyuan Material Co., Ltd.

[0046] Example 1

[0047] This example is used to illustrate the mortar according to the formulation of the mortar composition in Table 1, and the mortar is prepared according to the method as follows.

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

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

[0050] The stirring conditions are: temperature is 23℃, time is 3 min, and stirring speed is 60 r / min;

[0051] (2) The mixture I is first mixed with water according to the weight ratio of 1:0.18 to obtain a mortar, which is named S1;

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

[0053] In the absence of special instructions, the remaining examples and comparative examples are carried out by the same method as Example 1, except that the formulation of the mortar composition used is different, see Table 1 for details.

[0054] Table 1

[0055]

[0056] Table 1 (continued)

[0057]

[0058]

[0059] Test examples:

[0060] The prepared mortar (S1, S2, S3, S4, DS1, DS2, DS3, DS4 or DS5) is sprayed or troweled on the outer wall base body 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 0.1 mm of a finish agent is coated on the velvet surface, Figure 1 That is, the figure after the mortar S1 is coated on the outer wall base body.

[0061] The decorative mortar coated on the outer wall base body is tested according to the standard JC / T 1024-2019 “Wall Decorative Mortar”, and the experimental results are shown in Table 2.

[0062] Table 2

[0063]

[0064] As can be seen from the above results, the decorative mortar of the present application has excellent compatibility with the outer wall base body and good bonding strength without leveling process before coating the mortar.

[0065] The preferred embodiments of the present application are described in detail above, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including the combination of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as disclosed by the present application and fall within the protection scope of the present application.

Claims

1. A mortar composition, characterized in that: The composition comprises, based on the total weight of the composition, 18-28 wt% of cement, 10-20 wt% of filler, 55-70 wt% of quartz sand, 0.1-0.3 wt% of cellulose ether, 0.02-0.05 wt% of starch ether, and 0.02-0.04 wt% of a 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 a 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: first stirring the components of 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.

Images