Self-leveling mortar and preparation method thereof

Abstract

The invention provides self-leveling mortar and a preparation method thereof, and relates to the technical field of self-leveling mortar. The self-leveling mortar is prepared through the steps of dry powder preparation, inorganic glue preparation, mixing and the like. The invention overcomes the problems of the existing self-leveling mortar, provides the low-cost self-leveling mortar which does not produce collapsing and cracking, does not produce the problems of alkali efflorescence, frost efflorescence, blistering, peeling and the like on the self-leveling surface, and has a good application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of self-leveling mortar, and particularly relates to a self-leveling mortar and a preparation method thereof. Background Art

[0002] Self-leveling floor materials (Self-leveling materials offloor, abbreviated as SL) are dry-mixed powdery materials composed of various active ingredients, and can be used in industrial plants, workshops, warehouses, commercial malls, exhibition halls, stadiums, hospitals, various open spaces, offices, etc., and also in homes, villas, warm small spaces, etc. It can be used as a decorative surface layer or as a wear-resistant base layer. It is one of the important development trends in modern building floor construction, with wide applications and great market potential.

[0003] Compared with traditional products, self-leveling products are easy to construct. Adding an appropriate amount of water can form an approximately free-flowing slurry, which can quickly spread to obtain a highly flat floor; the construction speed is fast, the economic benefits are great, 5-10 times higher than traditional manual leveling, and it can be used for passage and loading in a short time, greatly shortening the construction period; the product quality is uniform and stable, the construction site is clean and tidy, which is conducive to civilized construction; it has good anti-moisture return property, strong protection for the surface layer, strong practicability and wide application range.

[0004] However, there are still many problems in the current self-leveling mortar during use. For example, the water demand of cement-based self-leveling mortar is large, but the excess water needs to evaporate into the air, and the evaporation of water will cause self-shrinkage of the self-leveling material and cracking. And the workability of some slag solid wastes and cement is extremely poor, and the segregation phenomenon is serious, which is easy to cause local separation of the slurry and aggregates. Therefore, it is difficult to achieve large-scale reduction utilization of making mortar with waste slag. In addition, surface alkali return, frosting and foaming and peeling problems will occur during the use of self-leveling mortar. Summary of the Invention

[0005] To solve the above problems, the present invention provides a self-leveling mortar and a preparation method thereof that can prevent self-shrinkage of the self-leveling material, prevent collapse and cracking, and do not have problems such as alkali return, frosting, foaming and peeling after use.

[0006] The preparation method of the self-leveling mortar of the present invention specifically includes the following steps:

[0007] S1. Dry powder production: Mix mineral powder, tailing powder and a reinforcing agent and stir evenly to obtain dry powder;

[0008] S2. Inorganic glue preparation: Mix inorganic mineral glue and water in proportion and stir evenly to obtain inorganic glue;

[0009] S3. Mix the dry powder and the inorganic glue in a weight ratio of 20:10-20 and stir evenly to obtain self-leveling mortar;

[0010] The preparation method of the enhancer is as follows:

[0011] Mix rare earth nitrate, straw powder, hydroxypropyl methylcellulose, silicone defoamer, and sodium polyacrylate in a weight ratio of 1:50:450:15:484, and stir at 120 r / min for 5 - 8 min to obtain it.

[0012] Furthermore, the particle size of the straw powder < 6.5 μm.

[0013] Furthermore, in step S1, the ore powder is S95 ore powder.

[0014] Furthermore, in step S1, the tailings powder is one or several of iron tailings, gold tailings, silicon manganese slag, silica sand, and boron mud.

[0015] Furthermore, in step S1, the particle size of the tailings powder is 70 - 400 mesh.

[0016] Preferably, in step S1, the particle size of the tailings powder is 200 - 400 mesh.

[0017] Furthermore, in step S1, the weight ratio of the ore powder, tailings powder, and enhancer is 1:3.2 - 4:0.035 - 0.045.

[0018] Furthermore, in step S1, the stirring time is 5 min, and the stirring speed is 200 - 1000 r / min.

[0019] Furthermore, in step S2, the inorganic mineral glue is 48 Be 0 inorganic mineral glue with a modulus of 1.4 - 1.8.

[0020] Furthermore, in step S2, the weight ratio of the inorganic mineral glue to water is 1:1.02.

[0021] Furthermore, in step S3, the weight ratio of the dry powder to the inorganic glue is 20:10 - 20.

[0022] Furthermore, in step S3, the stirring time is 3 - 5 min, and the stirring speed is 200 - 1000 r / min.

[0023] The present invention also provides a self - leveling mortar prepared according to the above method.

[0024] When paving the self - leveling mortar of the present invention, the principle of preparing and using immediately is followed, and the paving methods include but are not limited to spraying method, pouring method, or scraping method.

[0025] A large number of voids or displacements are generated between the self-leveling colloid molecular clusters due to the escape of water molecules, resulting in collapse. Due to the addition of the crack resistance agent, rare earth elements therein are prone to form coordination bond compounds and prevent the displacement and collapse between the molecular clusters, making the macromolecular cluster colloid tightly combined together to solve the technical problem of rapid autogenous shrinkage of the self-leveling mortar.

[0026] The present invention utilizes the thickening effect of the crack resistance agent to improve the workability of the tailings powder and the mortar, increase the surface adsorption force (adhesion force) of each component, and solve the technical problems of surface efflorescence and frosting after paving, enabling the colloid particles to be tightly and evenly combined together to prevent the self-leveling from foaming and peeling.

[0027] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0028] (1) The present invention solves the technical problem of rapid autogenous shrinkage of the self-leveling mortar by adding a crack resistance agent, preventing collapse and cracking;

[0029] (2) The addition of the crack resistance agent in the present invention can prevent problems such as surface efflorescence, frosting, foaming, and peeling of the self-leveling. Specific embodiments

[0030] The present invention provides a preparation method of a self-leveling mortar, which specifically includes the following steps:

[0031] S1. Dry powder production: Mix and stir evenly the mineral powder, tailings powder, and reinforcing agent to obtain dry powder;

[0032] S2. Inorganic glue preparation: Mix and stir evenly the inorganic mineral glue and water in a certain proportion to obtain inorganic glue;

[0033] S3. Mix and stir evenly the dry powder and the inorganic glue in a certain proportion to obtain the self-leveling mortar;

[0034] The preparation method of the reinforcing agent is as follows:

[0035] Mix rare earth nitrate, straw powder, hydroxypropyl methylcellulose, silicone defoamer, and sodium polyacrylate in a weight ratio of 1:50:450:15:484, and stir at 120 r / min for 5 - 8 min to obtain it.

[0036] In one embodiment, the particle size of the straw powder < 6.5 μm.

[0037] In one embodiment, in step S1, the mineral powder is S95 mineral powder.

[0038] In one embodiment, in step S1, the tailings powder is one or several of iron tailings, gold tailings, silicon manganese slag, silica sand, and boron mud.

[0039] In one embodiment, in step S1, the particle size of the tailing powder is 70 - 400 mesh.

[0040] In one embodiment, in step S1, the particle size of the tailing powder is 200 - 400 mesh.

[0041] In one embodiment, in step S1, the weight ratio of the ore powder, tailing powder, and reinforcing agent is 1:3.2 - 4:0.035 - 0.045.

[0042] In one embodiment, in step S1, the stirring time is 5 min, and the stirring speed is 200 - 1000 r / min.

[0043] In one embodiment, in step S2, the inorganic mineral glue is 48Be0 inorganic mineral glue with a modulus of 1.5.

[0044] In one embodiment, in step S2, the weight ratio of the inorganic mineral glue to water is 1:1.02.

[0045] In one embodiment, in step S3, the weight ratio of the dry powder to the inorganic glue is 20:10 - 20.

[0046] In one embodiment, in step S3, the stirring time is 3 - 5 min, and the stirring speed is 200 - 1000 r / min.

[0047] The present invention also provides a self - leveling mortar prepared according to the above method.

[0048] When paving the self - leveling mortar of the present invention, the principle of preparing and using it immediately is followed, and the paving methods include but are not limited to spraying method, pouring method, or scraping method.

[0049] The following further illustrates the technical solutions provided by the present invention in conjunction with embodiments.

[0050] Example 1

[0051] A method for preparing a self - leveling mortar is as follows:

[0052] S1. Mix S95 ore powder, 200 - mesh silica sand, and a reinforcing agent in a dry - powder gravity - free mixer at a weight ratio of 1:3.2:0.035 for 5 min, and then package and measure for standby;

[0053] The preparation method of the reinforcing agent is as follows:

[0054] Mix rare - earth nitrate, straw powder with a particle size of 6.5 μm, hydroxypropyl methylcellulose, silicone defoamer, and sodium polyacrylate in a weight ratio of 1:50:450:15:484, and stir at 120 r / min for 5 - 8 min to obtain it.

[0055] S2, Preparation of inorganic glue: Mix inorganic mineral glue with a modulus of 1.4 and 48 Be 0 and water in a weight ratio of 1:1.02, stir at 500 r / min in a stirring tank for 5 min, and then place it in a metering tank after completion;

[0056] The 48 Be 0 inorganic mineral glue is produced and prepared by Hunan Yueyang Tianying Chemical Co., Ltd., and its main component is liquid sodium silicate;

[0057] S3, Mix the dry powder and the inorganic glue in a weight ratio of 20:10, place them in a on-site manual and electric stirrer, and stir at 500 r / min for 5 min to obtain.

[0058] Example 2

[0059] A preparation method of self-leveling mortar is as follows:

[0060] S1, Mix S95 mineral powder, 400-mesh gold tailings, and reinforcing agent in a weight ratio of 1:3.6:0.025 in a dry powder gravity mixer and stir for 5 min, then package and meter for use;

[0061] The preparation method of the reinforcing agent is as follows:

[0062] Mix rare earth nitrate, straw powder with a particle size of 6.5 μm, hydroxypropyl methylcellulose, silicone defoamer, and sodium polyacrylate in a weight ratio of 1:50:450:15:484, and stir at 120 r / min for 5 - 8 min to obtain;

[0063] S2, Preparation of inorganic glue: Mix inorganic mineral glue with a modulus of 1.5 and 48 Be 0 and water in a weight ratio of 1:1.02, stir at 600 r / min in a stirring tank for 5 min, and then place it in a metering tank after completion;

[0064] The 48 Be inorganic mineral glue is produced and prepared by Hunan Yueyang Tianying Chemical Co., Ltd., and its main component is liquid sodium silicate;

[0065] S3, Mix the dry powder and the inorganic glue in a weight ratio of 20:12, place them in a on-site manual and electric stirrer, and stir at 800 r / min for 5 min to obtain.

[0066] Example 3

[0067] S1, Mix S95 mineral powder, 80-mesh iron tailings, and reinforcing agent in a weight ratio of 1:4:0.028 in a dry powder gravity mixer and stir for 5 min, then package and meter for use;

[0068] The preparation method of the rare earth enhancer is as follows:

[0069] Mix rare earth nitrate, straw powder with a particle size of 6.5 μm, hydroxypropyl methylcellulose, silicone defoamer, and sodium polyacrylate in a weight ratio of 1:50:450:15:484, and stir at 120 r / min for 5 - 8 min to obtain it;

[0070] S2. Preparation of inorganic glue: Mix 1.5 modulus, 48 Be 0 Mix inorganic mineral glue and water in a weight ratio of 1:1.02 and stir in a stirring tank at 450 r / min for 5 min, and then place it in a metering tank after completion;

[0071] The 48 Be0 inorganic mineral glue is produced and prepared by Hunan Yueyang Tianying Chemical Co., Ltd., and its main component is liquid sodium silicate;

[0072] S3. Mix the dry powder and the inorganic glue in a weight ratio of 20:15, put them into a on-site manual and electric stirrer, and stir at 500 r / min for 3 min to obtain it.

[0073] Test Example 1

[0074] According to JC / T 985 - 2017 "Cement - based self - leveling mortar for floor", test the 28 - day flexural strength, appearance, fluidity, tensile bond strength, dimensional change rate, impact resistance, 24 - hour compressive strength, 24 - hour flexural strength, abrasion resistance, and 28 - day compressive strength of the product obtained in Example 2. The results are as follows:

[0075]

[0076] In this article, specific examples are used to elaborate on the principles and implementation methods of the present invention. The descriptions of the above examples are only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A preparation method of self-leveling mortar, characterized in that, It includes the following steps: S1. Dry powder production: Mix mineral powder, tailings powder, and reinforcing agent evenly and stir to obtain dry powder; S2. Inorganic glue preparation: Mix inorganic mineral glue and water evenly and stir to obtain inorganic glue; S3. Mix the dry powder and the inorganic glue in a weight ratio of 20:10 - 20, stir evenly, and then self-leveling mortar is obtained; The preparation method of the reinforcing agent is as follows: Mix rare earth nitrate, straw powder, hydroxypropyl methylcellulose, silicone defoamer, and sodium polyacrylate in a weight ratio of 1:50:450:15:484, and stir at 120 r / min for 5 - 8 min to obtain it.

2. The preparation method of a self-leveling mortar according to claim 1, characterized in that, The mineral powder in step S1 is S95 mineral powder.

3. The preparation method of a self-leveling mortar according to claim 1, characterized in that, The tailings powder in step S1 is one or several of iron tailings, gold tailings, silicon manganese slag, silica sand, and boron mud.

4. The preparation method of a self-leveling mortar according to claim 1, wherein, The particle size of the tailings powder in step S1 is 70 - 400 mesh.

5. According to the preparation method of a self-leveling mortar described in claim 1, in step S1, the weight ratio of the mineral powder, tailings powder, and reinforcing agent is 1:3.2 - 4:0.035 - 0.

045.

6. The preparation method of a self-leveling mortar according to claim 1, characterized in that, The inorganic mineral glue described in step S2 is 48 Be 0 Inorganic mineral glue with a modulus of 1.45 - 1.8 7. The preparation method of a self-leveling mortar according to claim 6, characterized in that, In step S2, the weight ratio of the inorganic mineral glue to water is 1:0.8 - 1.02.

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