Special additive for machine-made sand plastering mortar and preparation method thereof

Abstract

The invention discloses a special admixture for machine-made sand plastering mortar and a preparation method thereof, and relates to the technical field of admixture preparation, the special admixture comprises the following preparation raw materials: hydroxypropyl methyl cellulose ether, starch ether, redispersible latex powder, an air entraining agent, a polycarboxylate superplasticizer, sodium polyacrylate, sodium gluconate, sodium tripolyphosphate, a thickener, a retarder, plant fibers and water. The special admixture for the machine-made sand plastering mortar can effectively prevent permeation and cracks, prevent water permeation and improve the impermeability of a wall surface; a high-molecular polymer contained in the admixture plays a role in inhibiting shrinkage of mortar, so that the crack resistance and durability are improved, the admixture is an energy-saving, environment-friendly and efficient good raw material and has heat preservation and heat insulation effects, and the preparation method can effectively improve the binding power of the mortar and overcome the defects of flaking, cracking, sand falling and the like; the flexibility of the plastering mortar is improved, the stress concentration can be better dispersed by combining with the introduction of fibers, and hollowing and cracking of a plaster layer are effectively prevented.

Description

Technical Field

[0001] The invention relates to the technical field of admixture preparation, in particular to a special admixture for machine-made sand plaster mortar and a preparation method thereof. Background Art

[0002] A special admixture for machine-made sand plaster mortar is an additive specifically designed for machine-made sand plaster mortar. Machine-made sand is produced by crushing stone in a specialized crusher, and suffers from poor particle shape and a high stone powder content. This admixture can improve the poor workability of the mortar due to the machine-made sand's granularity and increase the amount of stone powder added to the mortar. It imparts excellent workability, high water retention, bond strength, and mortar strength to machine-made sand mortars. It also reduces cement usage, effectively inhibits hollowing and cracking in the mortar, improves construction efficiency, and significantly improves the mortar's workability. With new demands on buildings and the application of new wall materials, the requirements for mortar performance are becoming increasingly specialized, and ordinary cement mortars struggle to meet these demands.

[0003] The current admixtures need to be stirred for a long time with the stone powder during use to maintain repeated mixing between the two, which results in low efficiency. In addition, the admixtures have insufficient adhesion. After the wall is plastered, it is affected by high temperatures and its surface moisture evaporates significantly faster, which easily leads to stress differences inside and outside the plastered surface, thus causing wall cracks and other problems. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a special admixture for machine-made sand plaster mortar and a preparation method thereof, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a special admixture for machine-made sand plaster mortar and a preparation method thereof, comprising the following preparation raw materials:

[0006] Hydroxypropyl methylcellulose ether, starch ether, redispersible latex powder, air entraining agent, polycarboxylic acid water reducer, sodium polyacrylate, sodium gluconate, sodium tripolyphosphate, thickener, retarder, plant fiber, water;

[0007] The specific proportions by weight are as follows:

[0008] 16-24 parts of hydroxypropyl methylcellulose ether, 12-20 parts of starch ether, 4-16 parts of redispersible latex powder, 4-12 parts of air entraining agent, 4-12 parts of polycarboxylic acid water reducer, 1-10 parts of sodium polyacrylate, 2-8 parts of sodium gluconate, 2-8 parts of sodium tripolyphosphate, 1-6 parts of thickener, 1-5 parts of retarder, 1-5 parts of plant fiber, and several parts of water.

[0009] 2. The special admixture for machine-made sand plaster mortar according to claim 1, characterized in that the specific proportion of the admixture in parts by weight is as follows:

[0010] 18 parts of hydroxypropyl methylcellulose ether, 18 parts of starch ether, 12 parts of redispersible latex powder, 6 parts of air entraining agent, 10 parts of polycarboxylic acid water reducer, 8 parts of sodium polyacrylate, 4 parts of sodium gluconate, 6 parts of sodium tripolyphosphate, 3 parts of thickener, 2 parts of retarder, 4 parts of plant fiber, and several parts of water.

[0011] 3. The special admixture for machine-made sand plaster mortar according to claim 1, characterized in that the specific proportion of the admixture in parts by weight is as follows:

[0012] 20 parts of hydroxypropyl methylcellulose ether, 18 parts of starch ether, 12 parts of redispersible latex powder, 8 parts of air entraining agent, 8 parts of polycarboxylic acid water reducer, 5 parts of sodium polyacrylate, 5 parts of sodium gluconate, 6 parts of sodium tripolyphosphate, 3 parts of thickener, 3 parts of retarder, 3 parts of plant fiber, and several parts of water.

[0013] 4. The special admixture for machine-made sand plaster mortar according to claim 1, characterized in that the specific proportion of the admixture in parts by weight is as follows:

[0014] 22 parts of hydroxypropyl methylcellulose ether, 16 parts of starch ether, 10 parts of redispersible latex powder, 10 parts of air entraining agent, 6 parts of polycarboxylic acid water reducer, 4 parts of sodium polyacrylate, 4 parts of sodium gluconate, 4 parts of sodium tripolyphosphate, 3 parts of thickener, 3 parts of retarder, 2 parts of plant fiber, and several parts of water.

[0015] A method for preparing a special admixture for machine-made sand plaster mortar, comprising the following specific steps:

[0016] Step 1: Prepare the corresponding amount of raw materials;

[0017] Step 2: Place hydroxypropyl methylcellulose ether, starch ether, redispersible latex powder and water in a blender in proportion, set the stirring temperature to 30-35°C, stir at 45-55 r / min for 20-30 minutes, and mix them evenly with the blender. After stirring, pour into the reactor;

[0018] Step 3: Use a blender to mix polycarboxylate water reducer, sodium polyacrylate and sodium tripolyphosphate, preheat to 30°C, and pour the mixture into a reactor for mixing;

[0019] Step 4: Preparation of additive mixture;

[0020] Step 5: Pour the added mixture obtained in step 4 into the reactor in step 3 and continue stirring for 10-15 minutes;

[0021] Step 6: Place the plant fiber into the reactor and stir for 70-90 minutes;

[0022] Step 7: Cool naturally to room temperature;

[0023] Step 8: Obtain admixture.

[0024] 6. A special admixture for machine-made sand plaster mortar and a preparation method thereof according to claim 5, characterized in that the preparation of the adding agent in step 4 is specifically as follows:

[0025] (1) Using a blender, stir and mix sodium gluconate, retarder, thickener, and some water for 10-15 minutes;

[0026] (2) Add air entraining agent to the mixer and continue stirring at 60-75 r / min until the mixture is uniform;

[0027] (3) Obtaining an additive mixture.

[0028] The present invention provides a special admixture for machine-made sand plaster mortar and a preparation method thereof, which has the following characteristics:

[0029] Beneficial effects:

[0030] The special admixture for machine-made sand plastering mortar and the preparation method thereof can effectively prevent penetration and cracks, block water penetration, and improve the anti-seepage ability of the wall surface; the high molecular polymer contained in the admixture inhibits the shrinkage of the mortar, thereby improving the crack resistance and durability, and is a good raw material that is energy-saving, environmentally friendly, and highly efficient, and has the effect of thermal insulation; and the preparation method can effectively improve the bonding strength of the mortar, overcoming the drawbacks of peeling, cracking, and sand loss; the flexibility of the plastering mortar is improved, and combined with the introduction of fibers, it can better disperse stress concentration, effectively preventing hollowing and cracking of the plaster layer. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Example 1: A special admixture for machine-made sand plaster mortar, comprising the following raw materials:

[0033] Hydroxypropyl methylcellulose ether, starch ether, redispersible latex powder, air entraining agent, polycarboxylic acid water reducer, sodium polyacrylate, sodium gluconate, sodium tripolyphosphate, thickener, retarder, plant fiber, water;

[0034] The specific proportions by weight are as follows:

[0035] 18 parts of hydroxypropyl methylcellulose ether, 18 parts of starch ether, 12 parts of redispersible latex powder, 6 parts of air entraining agent, 10 parts of polycarboxylic acid water reducer, 8 parts of sodium polyacrylate, 4 parts of sodium gluconate, 6 parts of sodium tripolyphosphate, 3 parts of thickener, 2 parts of retarder, 4 parts of plant fiber, and several parts of water.

[0036] A method for preparing a special admixture for machine-made sand plaster mortar, comprising the following specific steps:

[0037] Step 1: Prepare the corresponding amount of raw materials;

[0038] Step 2: Place hydroxypropyl methylcellulose ether, starch ether, redispersible latex powder and water in a blender in proportion, set the stirring temperature to 30-35°C, stir at 45-55 r / min for 25 minutes, mix them evenly with the blender, and pour into the reactor after stirring;

[0039] Step 3: Use a blender to mix polycarboxylate water reducer, sodium polyacrylate and sodium tripolyphosphate, preheat to 30°C, and pour the mixture into a reactor for mixing;

[0040] Step 4: Preparation of the additive mixture, as follows:

[0041] (1) Using a blender, stir and mix sodium gluconate, retarder, thickener, and some water for 12 minutes;

[0042] (2) Add air entraining agent to the mixer and continue stirring at 60-75 r / min until the mixture is uniform;

[0043] (3) obtaining an additive mixture;

[0044] Step 5: Pour the added mixture obtained in step 4 into the reactor in step 3 and continue stirring for 12 minutes;

[0045] Step 6: Place the plant fiber into the reactor and stir for 75 minutes;

[0046] Step 7: Cool naturally to room temperature;

[0047] Step 8: Obtain admixture.

[0048] Example 2: A special admixture for machine-made sand plaster mortar, comprising the following raw materials:

[0049] Hydroxypropyl methylcellulose ether, starch ether, redispersible latex powder, air entraining agent, polycarboxylic acid water reducer, sodium polyacrylate, sodium gluconate, sodium tripolyphosphate, thickener, retarder, plant fiber, water;

[0050] The specific proportions by weight are as follows:

[0051] 20 parts of hydroxypropyl methylcellulose ether, 18 parts of starch ether, 12 parts of redispersible latex powder, 8 parts of air entraining agent, 8 parts of polycarboxylic acid water reducer, 5 parts of sodium polyacrylate, 5 parts of sodium gluconate, 6 parts of sodium tripolyphosphate, 3 parts of thickener, 3 parts of retarder, 3 parts of plant fiber, and several parts of water.

[0052] A method for preparing a special admixture for machine-made sand plaster mortar, comprising the following specific steps:

[0053] Step 1: Prepare the corresponding amount of raw materials;

[0054] Step 2: Place hydroxypropyl methylcellulose ether, starch ether, redispersible latex powder and water in a blender in proportion, set the stirring temperature to 30-35°C, stir at 45-55 r / min for 24 minutes, and mix them evenly with the blender. After stirring, pour into the reactor;

[0055] Step 3: Use a blender to mix polycarboxylate water reducer, sodium polyacrylate and sodium tripolyphosphate, preheat to 30°C, and pour the mixture into a reactor for mixing;

[0056] Step 4: Preparation of the additive mixture, as follows:

[0057] (1) Using a blender, stir and mix sodium gluconate, retarder, thickener, and some water for 10 minutes;

[0058] (2) Add air entraining agent to the mixer and continue stirring at 60-75 r / min until the mixture is uniform;

[0059] (3) obtaining an additive mixture;

[0060] Step 5: Pour the added mixture obtained in step 4 into the reactor in step 3 and continue stirring for 15 minutes;

[0061] Step 6: Place the plant fiber into the reactor and stir for 80 minutes;

[0062] Step 7: Cool naturally to room temperature;

[0063] Step 8: Obtain admixture.

[0064] Example 3: A special admixture for machine-made sand plaster mortar, comprising the following raw materials:

[0065] Hydroxypropyl methylcellulose ether, starch ether, redispersible latex powder, air entraining agent, polycarboxylic acid water reducer, sodium polyacrylate, sodium gluconate, sodium tripolyphosphate, thickener, retarder, plant fiber, water;

[0066] The specific proportions by weight are as follows:

[0067] 22 parts of hydroxypropyl methylcellulose ether, 16 parts of starch ether, 10 parts of redispersible latex powder, 10 parts of air entraining agent, 6 parts of polycarboxylic acid water reducer, 4 parts of sodium polyacrylate, 4 parts of sodium gluconate, 4 parts of sodium tripolyphosphate, 3 parts of thickener, 3 parts of retarder, 2 parts of plant fiber, and several parts of water.

[0068] A method for preparing a special admixture for machine-made sand plaster mortar, comprising the following specific steps:

[0069] Step 1: Prepare the corresponding amount of raw materials;

[0070] Step 2: Place hydroxypropyl methylcellulose ether, starch ether, redispersible latex powder and water in a blender in proportion, set the stirring temperature to 30-35°C, stir at 45-55 r / min for 20 minutes, and mix them evenly with the blender. After stirring, pour into the reactor;

[0071] Step 3: Use a blender to mix polycarboxylate water reducer, sodium polyacrylate and sodium tripolyphosphate, preheat to 30°C, and pour the mixture into a reactor for mixing;

[0072] Step 4: Preparation of the additive mixture, as follows:

[0073] (1) Using a blender, stir and mix sodium gluconate, retarder, thickener, and some water for 10 minutes;

[0074] (2) Add air entraining agent to the mixer and continue stirring at 60-75 r / min until the mixture is uniform;

[0075] (3) obtaining an additive mixture;

[0076] Step 5: Pour the added mixture obtained in step 4 into the reactor in step 3 and continue stirring for 10 minutes;

[0077] Step 6: Place the plant fiber into the reactor and stir for 70 minutes;

[0078] Step 7: Cool naturally to room temperature;

[0079] Step 8: Obtain admixture.

[0080] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A special admixture for machine-made sand plaster mortar, characterized in that: The preparation includes the following raw materials: Hydroxypropyl methylcellulose ether, starch ether, redispersible latex powder, air entraining agent, polycarboxylic acid water reducer, sodium polyacrylate, sodium gluconate, sodium tripolyphosphate, thickener, retarder, plant fiber, water; The specific proportions by weight are as follows: 16-24 parts of hydroxypropyl methylcellulose ether, 12-20 parts of starch ether, 4-16 parts of redispersible latex powder, 4-12 parts of air entraining agent, 4-12 parts of polycarboxylic acid water reducer, 1-10 parts of sodium polyacrylate, 2-8 parts of sodium gluconate, 2-8 parts of sodium tripolyphosphate, 1-6 parts of thickener, 1-5 parts of retarder, 1-5 parts of plant fiber, and several parts of water.

2. The special admixture for machine-made sand plaster mortar according to claim 1, characterized in that: The specific proportions of the admixtures in parts by weight are as follows: 18 parts of hydroxypropyl methylcellulose ether, 18 parts of starch ether, 12 parts of redispersible latex powder, 6 parts of air entraining agent, 10 parts of polycarboxylic acid water reducer, 8 parts of sodium polyacrylate, 4 parts of sodium gluconate, 6 parts of sodium tripolyphosphate, 3 parts of thickener, 2 parts of retarder, 4 parts of plant fiber, and several parts of water.

3. The special admixture for machine-made sand plaster mortar according to claim 1, characterized in that: The specific proportions of the admixtures in parts by weight are as follows: 20 parts of hydroxypropyl methylcellulose ether, 18 parts of starch ether, 12 parts of redispersible latex powder, 8 parts of air entraining agent, 8 parts of polycarboxylic acid water reducer, 5 parts of sodium polyacrylate, 5 parts of sodium gluconate, 6 parts of sodium tripolyphosphate, 3 parts of thickener, 3 parts of retarder, 3 parts of plant fiber, and several parts of water.

4. The special admixture for machine-made sand plaster mortar according to claim 1, characterized in that: The specific proportions of the admixtures in parts by weight are as follows: 22 parts of hydroxypropyl methylcellulose ether, 16 parts of starch ether, 10 parts of redispersible latex powder, 10 parts of air entraining agent, 6 parts of polycarboxylic acid water reducer, 4 parts of sodium polyacrylate, 4 parts of sodium gluconate, 4 parts of sodium tripolyphosphate, 3 parts of thickener, 3 parts of retarder, 2 parts of plant fiber, and several parts of water.

5. A method for preparing the special admixture for machine-made sand plaster mortar according to any one of claims 1 to 4, characterized in that: The specific steps include: Step 1: Prepare the corresponding amount of raw materials; Step 2: Place hydroxypropyl methylcellulose ether, starch ether, redispersible latex powder and water in a blender in proportion, set the stirring temperature to 30-35°C, stir at 45-55 r / min for 20-30 minutes, and mix them evenly with the blender. After stirring, pour into the reactor; Step 3: Use a blender to mix polycarboxylate water reducer, sodium polyacrylate and sodium tripolyphosphate, preheat to 30°C, and pour the mixture into a reactor for mixing; Step 4: Preparation of additive mixture; Step 5: Pour the added mixture obtained in step 4 into the reactor in step 3 and continue stirring for 10-15 minutes; Step 6: Place the plant fiber into the reactor and stir for 70-90 minutes; Step 7: Cool naturally to room temperature; Step 8: Obtain admixture.

6. The special admixture for machine-made sand plaster mortar and the preparation method thereof according to claim 5, characterized in that: The preparation of the addition mixture in step 4 is as follows: (1) Using a blender, stir and mix sodium gluconate, retarder, thickener, and some water for 10-15 minutes; (2) Add air entraining agent to the mixer and continue stirring at 60-75 r / min until the mixture is uniform; (3) Obtaining an additive mixture.