阅读说明：本技术 一种湿拌砂浆添加剂及其制备方法 (Wet-mixed mortar additive and preparation method thereof ) 是由 王仁元 范爱国 刘文亮 解嵩 陈墨喜 刘佳斌 张跃沥 吴婵君 于 2020-05-29 设计创作，主要内容包括：本发明涉及一种湿拌砂浆添加剂及其制备方法,湿拌砂浆添加剂按照重量百分比包括以下原料：α-烯基磺酸钠0.5-1.5%、十二烷基硫酸2-5%、聚羧酸减水剂3-8%、葡萄糖酸钠10-15%、二乙醇胺1-3%、硫酸钠2-5%、4-甲基-2-戊烯酸2-5%、改性纳米二氧化硅5-10%和余量的水。本发明制备得到的湿拌砂浆添加剂具有良好的保水性能,能够有效延长砂浆水化的时间,改善水泥砂浆的可操作性能。(The invention relates to a wet-mixed mortar additive and a preparation method thereof, wherein the wet-mixed mortar additive comprises the following raw materials in percentage by weight: 0.5-1.5% of alpha-sodium alkenyl sulfonate, 2-5% of dodecyl sulfuric acid, 3-8% of polycarboxylic acid water reducing agent, 10-15% of sodium gluconate, 1-3% of diethanolamine, 2-5% of sodium sulfate, 2-5% of 4-methyl-2-pentenoic acid, 5-10% of modified nano silicon dioxide and the balance of water. The wet-mixed mortar additive prepared by the invention has good water retention property, can effectively prolong the hydration time of mortar, and improves the operability of the cement mortar.)

1. The wet-mixed mortar additive is characterized in that: the composite material comprises the following raw materials in percentage by weight: 0.5-1.5% of alpha-sodium alkenyl sulfonate, 2-5% of dodecyl sulfuric acid, 3-8% of polycarboxylic acid water reducing agent, 10-15% of sodium gluconate, 1-3% of diethanolamine, 2-5% of sodium sulfate, 2-5% of 4-methyl-2-pentenoic acid, 5-10% of modified nano silicon dioxide and the balance of water.

2. The wet-mixed mortar additive according to claim 1, wherein: the modified nano silicon dioxide is nano silicon dioxide doped by glass powder and titanium dioxide compound.

3. The wet-mixed mortar additive according to claim 1, wherein: the composite material comprises the following raw materials in percentage by weight: 1.5% of alpha-sodium alkenyl sulfonate, 3% of dodecyl sulfuric acid, 5% of polycarboxylic acid water reducing agent, 10% of sodium gluconate, 2% of diethanolamine, 3% of sodium sulfate, 3% of 4-methyl-2-pentenoic acid, 10% of modified nano silicon dioxide and the balance of water.

4. The method for preparing the wet-mixed mortar additive according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:

s1: adding titanium dioxide and glass powder into water, dispersing and stirring by ultrasonic waves to obtain mixed slurry, then adding a mixture of ammonium bicarbonate and sepiolite fibers into the mixed slurry, uniformly stirring at a high speed, and then performing spray drying to obtain a titanium dioxide and glass powder compound for later use;

s2: adding nano-silica powder, a silane coupling agent and phthalic anhydride into a reaction kettle, heating to 60-80 ℃, reacting for 50-90min, then adding a titanium dioxide and glass powder compound, heating to 320 ℃ at 300 ℃/min, continuing to react for 60-80min, then cooling to 150 ℃ at the speed of 10 ℃/min, continuing to react for 20-30min, cooling to room temperature after the reaction is finished, carrying out suction filtration on the reaction solution, transferring the obtained filter residue into a sintering furnace, and sintering at 600 ℃ for 2-3h to obtain nano-silica doped with the glass powder and titanium dioxide compound;

s3: the wet-mixed mortar additive is prepared by taking the raw materials according to the weight percentage of the raw materials in the claim 1, mixing and uniformly stirring.

5. The method for preparing the wet-mixed mortar additive according to claim 4, wherein the method comprises the following steps: in the step S1, the adding amount ratio of the titanium dioxide to the glass powder is 1: 2-2: 1.

6. the method for preparing the wet-mixed mortar additive according to claim 4, wherein the method comprises the following steps: the process conditions of the spray drying in the step S1 are as follows: the flow rate is 200-250g/min, the air inlet temperature is 400-500 ℃, the air flow rate is 0.3-0.5m3/min, and the air pressure is 0.2-0.5 MPa.

7. The method for preparing the wet-mixed mortar additive according to claim 4, wherein the method comprises the following steps: the weight ratio of the ammonium bicarbonate to the sepiolite fibers in the mixture of the step S1 is 1: 0.2-0.5.

8. The method for preparing the wet-mixed mortar additive according to claim 4, wherein the method comprises the following steps: the adding amount ratio of the mixture of ammonium bicarbonate and sepiolite fibers to the titanium dioxide in the step S1 is 0.5-1: 1.

9. The method for preparing the wet-mixed mortar additive according to claim 4, wherein the method comprises the following steps: in the step S2, the addition amount of the silane coupling agent is 1-1.5% of the nano silicon dioxide powder, and the addition amount of the phthalic anhydride is 6-8% of the nano silicon dioxide powder.

10. The method for preparing the wet-mixed mortar additive according to claim 4, wherein the method comprises the following steps: the step S2 specifically includes: adding nano silicon dioxide powder, a silane coupling agent and phthalic anhydride into a reaction kettle, heating to 65 ℃, reacting for 60min, then adding a titanium dioxide and glass powder compound, heating to 300 ℃, continuing to react for 80min, then cooling to 120 ℃ at the speed of 10 ℃/min, continuing to react for 20min, cooling to room temperature after the reaction is finished, carrying out suction filtration on the reaction solution, transferring the obtained filter residue into a sintering furnace, and sintering at the temperature of 600 ℃ for 2h to obtain the nano silicon dioxide doped with the glass powder and titanium dioxide compound.

Technical Field

The invention relates to the technical field of wet-mixed mortar, in particular to a wet-mixed mortar additive and a preparation method thereof.

Background

The mortar is a building material prepared by mixing an inorganic cementing material, fine aggregates, an additive and water in proportion, and is used for masonry and plastering engineering in building construction to realize building structure and surface protection, decoration and the like. The traditional mortar adopts field stirring, the errors of the stirring time and the metering device are large, and the opening time and the workability of the mortar are difficult to ensure.

The wet-mixed mortar is different from the traditional original production operation mode of self-mixed mortar, is directly produced in a commercial concrete mixing plant, can realize the industrialization and automation of production, can be used after being transported to a construction site, is beneficial to the control and guarantee of the mortar quality, reduces the labor intensity and improves the construction efficiency. However, the workability of the wet-mixed mortar fluctuates along with the fluctuation of the quality of the raw materials and is greatly influenced by weather factors, so that the production of the wet-mixed mortar mainly depends on additives to control the performance, the mortar admixture can guarantee the opening time of the mortar, the mortar has good activity and easiness, the setting time is determined, the mortar has excellent construction performance, the strength, the binding power and the durability of the mortar are improved, and the hollowing and cracking of the mortar can be effectively inhibited. Aiming at wet-mixed mortar in different use environments, proper additives are required to be added to change the characteristics of the wet-mixed mortar, so that the wet-mixed mortar can meet various complicated construction conditions.

Disclosure of Invention

The invention aims to solve the technical problems and provide a wet-mixed mortar additive and a preparation method thereof, and the prepared wet-mixed mortar additive has good water retention property, can effectively prolong the hydration time of mortar and improve the operability of cement mortar.

In order to solve the technical problems, the invention adopts the technical scheme that: the wet-mixed mortar additive comprises the following raw materials in percentage by weight: 0.5-1.5% of alpha-sodium alkenyl sulfonate, 2-5% of dodecyl sulfuric acid, 3-8% of polycarboxylic acid water reducing agent, 10-15% of sodium gluconate, 1-3% of diethanolamine, 2-5% of sodium sulfate, 2-5% of 4-methyl-2-pentenoic acid, 5-10% of modified nano silicon dioxide and the balance of water.

The wet-mixed mortar additive is further optimized by the following steps: the modified nano silicon dioxide is nano silicon dioxide doped by glass powder and titanium dioxide compound.

The wet-mixed mortar additive is further optimized by the following steps: the composite material comprises the following raw materials in percentage by weight: 1.5% of alpha-sodium alkenyl sulfonate, 3% of dodecyl sulfuric acid, 5% of polycarboxylic acid water reducing agent, 10% of sodium gluconate, 2% of diethanolamine, 3% of sodium sulfate, 3% of 4-methyl-2-pentenoic acid, 10% of modified nano silicon dioxide and the balance of water.

A preparation method of a wet-mixed mortar additive comprises the following steps:

s1: adding titanium dioxide and glass powder into water, dispersing and stirring by ultrasonic waves to obtain mixed slurry, then adding a mixture of ammonium bicarbonate and sepiolite fibers into the mixed slurry, uniformly stirring, and performing spray drying to obtain a titanium dioxide and glass powder compound for later use;

s2: adding nano-silica powder, a silane coupling agent and phthalic anhydride into a reaction kettle, heating to 60-80 ℃, reacting for 50-90min, then adding a titanium dioxide and glass powder compound, heating to 320 ℃ at 300 ℃/min, continuing to react for 60-80min, then cooling to 150 ℃ at the speed of 10 ℃/min, continuing to react for 20-30min, cooling to room temperature after the reaction is finished, carrying out suction filtration on the reaction solution, transferring the obtained filter residue into a sintering furnace, and sintering at 600 ℃ for 2-3h to obtain nano-silica doped with the glass powder and titanium dioxide compound;

s3: the wet-mixed mortar additive is prepared by taking the raw materials according to the weight percentage of the raw materials in the claim 1, mixing and uniformly stirring.

The preparation method of the wet-mixed mortar additive is further optimized as follows: in the step S1, the adding amount ratio of the titanium dioxide to the glass powder is 1: 2-2: 1.

the preparation method of the wet-mixed mortar additive is further optimized as follows: the process conditions of the spray drying in the step S1 are as follows: the flow rate is 200-250g/min, the air inlet temperature is 400-500 ℃, the air flow rate is 0.3-0.5m3/min, and the air pressure is 0.2-0.5 MPa.

The preparation method of the wet-mixed mortar additive is further optimized as follows: the weight ratio of the ammonium bicarbonate to the sepiolite fibers in the mixture of the step S1 is 1: 0.2-0.5.

The preparation method of the wet-mixed mortar additive is further optimized as follows: the adding amount ratio of the mixture of ammonium bicarbonate and sepiolite fibers to the titanium dioxide in the step S1 is 0.5-1: 1.

The preparation method of the wet-mixed mortar additive is further optimized as follows: in the step S2, the addition amount of the silane coupling agent is 1-1.5% of the nano silicon dioxide powder, and the addition amount of the phthalic anhydride is 6-8% of the nano silicon dioxide powder.

The preparation method of the wet-mixed mortar additive is further optimized as follows: the step S2 specifically includes: adding nano-silica powder, a silane coupling agent and phthalic anhydride into a reaction kettle, heating to 65 ℃, reacting for 60min, then adding a titanium dioxide and glass powder compound, heating to 300 ℃, continuing to react for 80min, then cooling to 120 ℃ at the speed of 10 ℃/min, continuing to react for 20min, cooling to room temperature after the reaction is finished, carrying out suction filtration on reaction liquid, transferring obtained filter residue into a sintering furnace, sintering for 2h at the temperature of 600 ℃, and obtaining the nano-silica doped with the glass powder and titanium dioxide compound

The wet-mixed mortar additive disclosed by the invention has the following beneficial effects:

the wet-mixed mortar additive contains modified nano silicon dioxide, the nano silicon dioxide is doped and modified by a glass powder and titanium dioxide compound, micropores are formed on the surface of the glass powder and titanium dioxide compound, the nano silicon dioxide is embedded in the micropores, and after the nano silicon dioxide is mixed and stirred with cement mortar, the glass powder, titanium dioxide compound and 4-methyl-2-pentenoic acid are matched with each other to adsorb free water in a hydration process, so that the free water and the nano silicon oxide in the micropores are subjected to position exchange, on one hand, a good water retention effect is achieved, the hydration time of the cement mortar is favorably prolonged, on the other hand, the replaced nano silicon dioxide can be filled in cavities of hydrated minerals after the cement mortar is hydrated and gaps generated after the free water is resolved, and further, the mortar compactness and the final compressive strength are improved.

Detailed Description

The technical solution of the present invention is further described below with reference to specific embodiments.