Alkali-efflorescence-resistant cement-based decorative mortar and preparation method thereof

Abstract

The invention relates to an alkali efflorescence-resistant cement-based decorative mortar and a preparation method thereof. The alkali efflorescence-resistant cement-based decorative mortar is mainly prepared from the following components in parts by mass: # imgabs0 # cellulose A is hydroxypropyl methyl cellulose with the viscosity of 2000-3000; and the cellulose B is hydroxypropyl methyl cellulose with the viscosity of 60000 to 80000. The cement-based decorative mortar overcomes the defects that only a water repellent is added in an existing cement-based decorative mortar system, and the saltpetering-resistant effect is poor, and the cement-based decorative mortar has good saltpetering resistance through the synergistic effect of the active filler metakaolin, two preferred types of cellulose and a small amount of water repellent and the cooperation with other preferred types and dosage proportions of components in the system.

Description

Technical Field

[0001] The invention relates to an anti-efflorescence cement-based decorative mortar and a preparation method thereof, and is applied in the field of building decorative materials. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] Decorative mortar is an inorganic decorative material, which is widely used in the decorative layer of indoor and outdoor walls. Due to its rich texture, varied texture, lasting color and excellent environmental performance, decorative mortar is extremely popular in Europe and the United States. However, the cement-based materials in cement-based decorative mortar are prone to alkali efflorescence under the erosion of rainwater, which affects the decorative effect and greatly restricts its development in China.

[0004] The essence of efflorescence of cement-based decorative mortar is that when there is water outside, water will enter the mortar through the gaps in the mortar and dissolve the free soluble metal ions. During the evaporation of water, the metal ions dissolved in the water will migrate to the surface of the mortar along with the water and react with carbon dioxide in the air to form white carbonate. Among them, calcium carbonate formed by calcium ions is insoluble in water and is the fundamental factor of efflorescence. Therefore, to solve the efflorescence problem from the root, it is necessary to reduce free calcium ions and increase the density of the mortar to weaken the ability of water to enter the mortar.

[0005] Existing companies have solved the efflorescence problem by simply adding a water repellent to the decorative mortar (such as CN202010603079.2 A colored finishing mortar and its preparation method). Although it has some effect, the effect is not obvious. In particular, the decorative mortar still has the problem of poor early efflorescence resistance and unsatisfactory long-term efflorescence resistance.

[0006] Therefore, it is urgent to provide an anti-efflorescence cement-based decorative mortar with good anti-efflorescence property and a preparation method thereof. Summary of the invention

[0007] In order to overcome the disadvantage of poor anti-efflorescence effect of only adding water repellent in the existing cement-based decorative mortar system, the present invention provides an anti-efflorescence cement-based decorative mortar and a preparation method thereof, which has good anti-efflorescence property through the synergistic effect of active filler metakaolin, two preferred types of cellulose and a small amount of water repellent, and the combination with other preferred component types and usage ratios in the system.

[0008] The technical solution of the present invention is as follows:

[0009] An anti-efflorescence cement-based decorative mortar is mainly prepared from the following components in the following mass proportions:

[0010]

[0011]

[0012] Cellulose A is hydroxypropyl methylcellulose with a viscosity of 2000-3000;

[0013] Cellulose B is hydroxypropyl methylcellulose with a viscosity of 60,000-80,000.

[0014] The anti-efflorescence cement-based decorative mortar of the present application has good anti-efflorescence property through the synergistic effect of active filler metakaolin, two preferred types of cellulose and a small amount of water repellent, and the coordination with other preferred component types and their dosage ratios in the system. The active filler kaolin is introduced into the system formula to react with the excess free calcium ions (the main reason for the early efflorescence of the facing mortar) produced in the early stage of cement hydration to generate calcium aluminate to reduce the probability of the existence of free calcium ions; a small amount of water repellent is introduced to improve the hydrophobicity of the surface and interior of the mortar, and increase the difficulty of water entering the interior of the mortar to reduce the risk of efflorescence; and through the synergistic effect of two cellulose ethers (hydroxypropyl methylcellulose) with different preferred viscosities, while optimizing the construction properties of the facing mortar, the density of the mortar itself is further improved, and the migration ability of calcium ions is further weakened to reduce the risk of efflorescence. The above three work together and cooperate with other preferred component types and their dosage ratios in the system, thereby fundamentally solving the difficulty of easy efflorescence of cement-based materials. The anti-efflorescence cement-based decorative mortar uses the above multiple anti-efflorescence technical means. After watering for 24 hours after construction, the finishing layer has no obvious efflorescence and rain marks, and has good aesthetics. In addition, the use of stearate as an ion exchange carrier can replace free calcium ions in the early stage of mortar hydration, significantly improving the anti-efflorescence performance in the early stage of construction.

[0015] The anti-efflorescence cement-based decorative mortar also includes 0.2-0.5 parts of color powder (ie, an appropriate amount of color powder).

[0016] Toners of different colors and amounts can be added to adjust the color according to specific needs.

[0017] The water reducing agent is a polycarboxylate water reducing agent, and the sand is river sand.

[0018] When in use, the anti-efflorescence cement-based decorative mortar is mixed with a proper amount of water.

[0019] The anti-efflorescence cement-based decorative mortar of the present application is convenient and quick to use.

[0020] The method for preparing the anti-efflorescence cement-based decorative mortar comprises the following steps performed in sequence:

[0021] (1) Start the mixer, put cement, sand and metakaolin into the mixer, and mix them evenly;

[0022] (2) Continue to add the redispersible latex powder, cellulose A, cellulose B, water reducing agent, zinc stearate and water repellent into the mixer, stirring while adding the materials until the mixture is evenly mixed.

[0023] The preferred steps of the preparation method of the anti-efflorescence cement-based decorative mortar of the present application are faster and more uniform in mixing, and the preparation method has simple steps and is easy to operate and promote.

[0024] After step (3), the method further comprises the step of uniformly mixing the anti-efflorescence cement-based decorative mortar with an appropriate amount of water when using the mortar.

[0025] The anti-efflorescence cement-based decorative mortar of the present application is convenient and quick to use.

[0026] In step (2), color powder is also added into the mixer.

[0027] The color of the anti-efflorescence cement-based decorative mortar can be adjusted according to specific needs.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] 1) The anti-efflorescence cement-based decorative mortar of the present application has good anti-efflorescence property through the synergistic effect of active filler metakaolin, zinc stearate, two preferred types of cellulose and a small amount of water repellent, and the coordination with other preferred component types and their dosage ratios in the system;

[0030] 2) Color powders of different colors and weights can be added to adjust the color of the anti-efflorescence cement-based decorative mortar according to specific needs;

[0031] 3) The preparation method of the anti-efflorescence cement-based decorative mortar has simple steps and is easy to operate and promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 1 is an experimental result diagram of Example 1 of the alkali-resistant cement-based decorative mortar and the preparation method thereof according to the present invention;

[0033] Figure 2 1 is an experimental result diagram of Example 2 of the alkali-resistant cement-based decorative mortar and the preparation method thereof according to the present invention;

[0034] Figure 3 3 is a graph showing the experimental results of Example 3 of the alkali-resistant cement-based decorative mortar and the preparation method thereof according to the present invention;

[0035] Figure 4 It is a graph of experimental results of comparative samples of the anti-efflorescence cement-based decorative mortar and its preparation method described in the present invention. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments.

[0037] Example 1

[0038] The anti-efflorescence cement-based decorative mortar of the present invention is mainly prepared from the following components in the following mass proportions:

[0039]

[0040] Cellulose A is hydroxypropyl methylcellulose with a viscosity of 2000-3000;

[0041] Cellulose B is hydroxypropyl methylcellulose with a viscosity of 60,000-80,000.

[0042] The water reducing agent is a polycarboxylate water reducing agent, and the sand is river sand.

[0043] When in use, the anti-efflorescence cement-based decorative mortar is mixed with a proper amount of water.

[0044] The method for preparing the anti-efflorescence cement-based decorative mortar comprises the following steps performed in sequence:

[0045] (1) Start the mixer, put cement, sand and metakaolin into the mixer, and mix them evenly;

[0046] (2) Continue to add the redispersible latex powder, cellulose A, cellulose B, water reducing agent, zinc stearate and water repellent into the mixer, stirring while adding the materials until the mixture is evenly mixed.

[0047] After step (3), the method further comprises the step of uniformly mixing the anti-efflorescence cement-based decorative mortar with an appropriate amount of water when using the mortar.

[0048] Example 2

[0049] The anti-efflorescence cement-based decorative mortar of the present invention is mainly prepared from the following components in the following mass proportions:

[0050]

[0051] Cellulose A is hydroxypropyl methylcellulose with a viscosity of 2000-3000;

[0052] Cellulose B is hydroxypropyl methylcellulose with a viscosity of 60,000-80,000.

[0053] The anti-efflorescence cement-based decorative mortar also includes 0.2 parts of color powder.

[0054] The water reducing agent is a polycarboxylate water reducing agent, and the sand is river sand.

[0055] When in use, the anti-efflorescence cement-based decorative mortar is mixed with a proper amount of water.

[0056] The method for preparing the anti-efflorescence cement-based decorative mortar comprises the following steps performed in sequence:

[0057] (1) Start the mixer, put cement, sand and metakaolin into the mixer, and mix them evenly;

[0058] (2) Continue to add the redispersible latex powder, cellulose A, cellulose B, water reducing agent, zinc stearate and water repellent into the mixer, stirring while adding the materials until the mixture is evenly mixed.

[0059] After step (3), the method further comprises the step of uniformly mixing the anti-efflorescence cement-based decorative mortar with an appropriate amount of water when using the mortar.

[0060] In step (2), color powder is also added into the mixer.

[0061] Example 3

[0062] The anti-efflorescence cement-based decorative mortar of the present invention is mainly prepared from the following components in the following mass proportions:

[0063]

[0064]

[0065] Cellulose A is hydroxypropyl methylcellulose with a viscosity of 2000-3000;

[0066] Cellulose B is hydroxypropyl methylcellulose with a viscosity of 60,000-80,000.

[0067] The anti-efflorescence cement-based decorative mortar also includes 0.5 parts of color powder.

[0068] The water reducing agent is a polycarboxylate water reducing agent, and the sand is river sand.

[0069] When in use, the anti-efflorescence cement-based decorative mortar is mixed with a proper amount of water.

[0070] The method for preparing the anti-efflorescence cement-based decorative mortar comprises the following steps performed in sequence:

[0071] (1) Start the mixer, put cement, sand and metakaolin into the mixer, and mix them evenly;

[0072] (2) Continue to add the redispersible latex powder, cellulose A, cellulose B, water reducing agent, zinc stearate and water repellent into the mixer, stirring while adding the materials until the mixture is evenly mixed.

[0073] After step (3), the method further comprises the step of uniformly mixing the anti-efflorescence cement-based decorative mortar with an appropriate amount of water when using the mortar.

[0074] In step (2), color powder is also added into the mixer.

[0075] Experimental data:

[0076] Comparative sample: conventional facing mortar (prepared according to CN202010603079.2 A colored facing mortar and its preparation method)

[0077] Testing method: Carry out water spray test 24 hours after the finishing mortar is constructed to simulate the anti-efflorescence test of rain 24 hours after the actual construction.

[0078] like Figure 1-4 The experimental results are as follows:

[0079] Figure 1 : The anti-efflorescence cement-based decorative mortar of Example 1 was watered 24 hours after construction, and no efflorescence occurred;

[0080] Figure 2 : The anti-efflorescence cement-based decorative mortar of Example 2 was watered 24 hours after construction, and no efflorescence occurred;

[0081] Figure 3 : The anti-efflorescence cement-based decorative mortar of Example 3 was watered 24 hours after construction, and no efflorescence occurred;

[0082] Figure 4 : The comparison sample of conventional finishing mortar was watered 24 hours after construction, and alkali efflorescence was serious.

[0083] It can be seen that the anti-efflorescence cement-based decorative mortar of the present application has good anti-efflorescence property.

Claims

1. An anti-efflorescence cement-based decorative mortar, characterized in that: It is mainly prepared by the following components in the following mass ratio: Cellulose A is hydroxypropyl methylcellulose with a viscosity of 2000-3000; Cellulose B is hydroxypropyl methylcellulose with a viscosity of 60,000-80,000.

2. The anti-efflorescence cement-based decorative mortar according to claim 1, characterized in that: The anti-efflorescence cement-based decorative mortar also includes 0.2-0.5 parts of color powder.

3. The anti-efflorescence cement-based decorative mortar according to claim 1, characterized in that: The water reducing agent is a polycarboxylate water reducing agent, and the sand is river sand.

4. The anti-efflorescence cement-based decorative mortar according to claim 1, characterized in that: When in use, the anti-efflorescence cement-based decorative mortar is mixed with a proper amount of water.

5. The method for preparing the anti-efflorescence cement-based decorative mortar according to any one of claims 1 to 4, characterized in that: The steps are as follows: (1) Start the mixer, put cement, sand and metakaolin into the mixer, and mix them evenly; (2) Continue to add the redispersible latex powder, cellulose A, cellulose B, water reducing agent, zinc stearate and water repellent into the mixer, stirring while adding the materials until the mixture is evenly mixed.

6. The method for preparing the anti-efflorescence cement-based decorative mortar according to claim 5, characterized in that: After step (2), the method further comprises the step of uniformly mixing the anti-efflorescence cement-based decorative mortar with an appropriate amount of water when using the mortar.

7. The method for preparing the anti-efflorescence cement-based decorative mortar according to claim 5, characterized in that: In step (2), color powder is also added into the mixer.

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