Manufacturing method of flexible water-resistant mortar

Abstract

The invention discloses a manufacturing method of flexible water-resistant mortar. The manufacturing method comprises the following steps: preparing raw materials, namely weighing cement, quartz sand with different granularities, filler, cellulose ether, nano silicon dioxide, polymer emulsion and auxiliaries; dry mixing and stirring: mixing and stirring the cement, the quartz sand, the filler, the cellulose ether and the nano silicon dioxide; adding water for premixing: adding a proper amount of water into the mixed dry material and uniformly stirring; emulsion addition: adding a polymer emulsion, a coalescing agent and a water repellent, and continuously stirring; adding auxiliaries: adding a water reducing agent, a defoaming agent and a coloring agent, and increasing the stirring speed until the slurry is uniform; according to the present invention, the nano-silica and the water repellent are added to enhance the compactness and the hydrophobicity of the mortar so as to improve the impermeability and the durability of the product, and meanwhile, the ratio of the polymer emulsion to the filler is adjusted, and the segmented stirring process is combined, such that the flexibility of the product is significantly improved, and the cracking phenomenon can be effectively prevented.

Description

Technical Field

[0001] This invention relates to the field of flexible water-resistant mortar technology, specifically a method for preparing flexible water-resistant mortar. Background Technology

[0002] Flexible water-resistant mortar is a new type of building waterproofing material. It is usually made of cement as a base material, mixed with polymer emulsion, aggregate, filler and various additives. The addition of polymer can significantly improve the flexibility, adhesion and waterproofing performance of the mortar.

[0003] A search revealed that patent CN108424170B discloses a polymer cement waterproof mortar that uses a conventional cement-quartz sand system and is modified by adding polymer emulsion. This results in insufficient flexibility of the mortar, which is prone to shrinkage cracks under wet-dry cycles or temperature changes. At the same time, its elongation at break is low and its resistance to seepage pressure is insufficient, making it difficult to meet the requirements of high-standard waterproofing projects. Therefore, this application proposes a method for preparing a flexible water-resistant mortar. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing flexible water-resistant mortar to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing flexible water-resistant mortar, comprising the following steps: S1. Raw material preparation: Weigh cement, quartz sand of different particle sizes, fillers, cellulose ether, nano silica, polymer emulsion and various additives. S2. Dry mixing: Mix cement, quartz sand, filler, cellulose ether and nano silica. S3. Premix with water: Add an appropriate amount of water to the mixed dry materials and stir evenly; S4. Emulsion addition: Add polymer emulsion, film-forming aid and hydrophobic agent, and continue stirring; S5. Additives: Add water-reducing agent, defoamer and colorant, and increase the stirring speed until the slurry is uniform; S6. Discharge and packaging: Conduct quality testing on the prepared mortar, and discharge and package it after passing the test.

[0006] Preferably, the dry mixing speed is 30-50 r / min and the mixing time is 1-2 minutes.

[0007] Preferably, the amount of water added in the water-added premix is ​​16-19% of the total mass of the dry materials.

[0008] Preferably, the amount of polymer emulsion added in the emulsion addition is 35-45 kg per ton of dry material.

[0009] Preferably, the stirring speed during the addition of the additive is 60-80 r / min and the time is 3-5 minutes.

[0010] Preferably, the amount of nano-silica added is 7-9 kg per ton of dry material.

[0011] Preferably, the amount of cellulose ether added is 1.8-2.2 kg per ton of dry material.

[0012] Preferably, the filler is added at a rate of 45-55 kg per ton of dry material.

[0013] Preferably, the quality tests include: consistency, tensile bond strength, elongation at break, and impermeability pressure.

[0014] Compared with the prior art, the beneficial effects of the present invention are: by adding nano silica and water-repellent agent, the density and water repellency of the mortar are enhanced, thereby improving the impermeability and durability of the product. At the same time, by adjusting the ratio of polymer emulsion to filler and combining it with segmented mixing process, the flexibility of the product is significantly improved, which can effectively prevent cracking. By employing a process of dry mixing followed by wet mixing and step-by-step addition of additives, the uniform dispersion of each component is ensured, emulsion demulsification is avoided, and the resulting mortar has better workability, maintaining good film-forming properties and scraping properties under different environmental conditions, thereby extending its service life. Detailed Implementation

[0015] The following describes in detail a method for preparing flexible water-resistant mortar provided by the present invention with reference to specific embodiments. It should also be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies.

[0016] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0017] Generally, terms can be understood at least partially from their use in context. For example, depending at least partially on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but can instead, depending at least partially on the context, allow for the presence of other factors that are not necessarily explicitly described. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of this invention.

[0018] This invention provides a technical solution: a method for preparing flexible water-resistant mortar, comprising the following steps: S1. Raw material preparation: Weigh cement, quartz sand of different particle sizes, fillers, cellulose ether, nano silica, polymer emulsion and various additives. S2. Dry mixing: Mix cement, quartz sand, filler, cellulose ether and nano silica. S3. Premix with water: Add an appropriate amount of water to the mixed dry materials and stir evenly; S4. Emulsion addition: Add polymer emulsion, film-forming aid and hydrophobic agent, and continue stirring; S5. Additives: Add water-reducing agent, defoamer, and colorant, and increase the stirring speed until the slurry is uniform; S6. Discharge and Packaging: Perform quality testing on the prepared mortar, and discharge it into packages after passing the test. Example 1: S1. Raw material preparation: Weigh out 390kg of cement, 293kg of 80-120 mesh quartz sand, 200kg of 200 mesh quartz sand, 50kg of 325 mesh heavy calcium carbonate, 2kg of hydroxypropyl methylcellulose ether (viscosity 100,000-150,000 mPa·s), 40kg of acrylic emulsion, 2kg of polycarboxylate superplasticizer, 1.5kg of silicone defoamer, 5kg of alcohol ester film-forming aid, 8kg of nano silica, 4kg of silicone water-repellent agent, and 5kg of carbon black; S2. Dry mixing: Add cement, two types of quartz sand, heavy calcium carbonate, cellulose ether and nano silica into the mixer and mix at 35 r / min for 2 minutes. S3. Add water and premix: Add water equal to 18% of the dry material mass and stir at 55 r / min for 1 minute; S4. Emulsion addition: Slowly add the acrylic emulsion, and simultaneously add the film-forming aid and water-repellent agent, and continue stirring at 55 r / min for 1 minute; S5. Additives: Add water-reducing agent, defoamer and carbon black in sequence, increase the speed to 70 r / min and stir for 3 minutes until the slurry is uniform; S6. Unloading and Packaging: After quality inspection, the finished product is packed into 25kg composite paper bags and sealed for storage in a cool and dry environment. Example

[0019] S1. Raw material preparation: Weigh out 400kg of cement, 280kg of 80-120 mesh quartz sand, 210kg of 200 mesh quartz sand, 45kg of 325 mesh fly ash, 2.2kg of hydroxypropyl methylcellulose ether, 42kg of styrene-butadiene latex, 1.8kg of polycarboxylate superplasticizer, 1.8kg of silicone defoamer, 5.5kg of alcohol ester film-forming aid, 8.5kg of nano silica, 4.2kg of silicone water-repellent agent, and 4.8kg of carbon black; S2. Dry mixing: Add the dry components to the mixer and mix at 40 r / min for 1.5 minutes; S3. Add water and premix: Add water equal to 17% of the dry material mass and stir at 60 r / min for 1 minute; S4. Emulsion addition: Add styrene-butadiene latex, film-forming aid and water-repellent agent, and stir at 60 r / min for 1.5 minutes; S5. Additives: Add other additives and stir at 75 r / min for 4 minutes until the slurry is uniform; S6. Unloading and Packaging: After quality inspection, pack the finished product into 25kg composite paper bags, seal and store in a cool, dry environment. Example

[0020] S1. Raw material preparation: Weigh out 385kg of cement, 300kg of 80-120 mesh quartz sand, 195kg of 200 mesh quartz sand, 55kg of 325 mesh heavy calcium carbonate, 1.8kg of hydroxypropyl methylcellulose ether, 38kg of acrylic emulsion, 2.2kg of polycarboxylate superplasticizer, 1.6kg of silicone defoamer, 4.8kg of alcohol ester film-forming aid, 7.8kg of nano silica, 3.8kg of silicone water-repellent agent, and 5.2kg of carbon black; S2. Dry mixing: Add the dry components to the mixer and mix at 45 r / min for 1.5 minutes; S3. Add water and premix: Add water equal to 18.5% of the dry material mass and stir at 65 r / min for 1 minute; S4. Emulsion addition: Add emulsion and related additives, and stir at 65 r / min for 1 minute; S5. Adding additives: Add the remaining additives and stir at 80 r / min for 3.5 minutes until the slurry is uniform; S6. Unloading and Packaging: After quality inspection, the finished product is packed into 25kg composite paper bags, sealed and stored in a cool and dry environment.

[0021] While embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing flexible water-resistant mortar, characterized in that, Includes the following steps: S1. Raw material preparation: Weigh cement, quartz sand of different particle sizes, fillers, cellulose ether, nano silica, polymer emulsion and various additives. S2. Dry mixing: Mix cement, quartz sand, filler, cellulose ether and nano silica. S3. Premix with water: Add an appropriate amount of water to the mixed dry materials and stir evenly; S4. Emulsion addition: Add polymer emulsion, film-forming aid and hydrophobic agent, and continue stirring; S5. Additives: Add water-reducing agent, defoamer and colorant, and increase the stirring speed until the slurry is uniform; S6. Discharge and packaging: Conduct quality testing on the prepared mortar, and discharge and package it after passing the test.

2. The method for preparing a flexible water-resistant mortar according to claim 1, characterized in that: The dry mixing speed is 30-50 r / min, and the mixing time is 1-2 minutes.

3. The method for preparing a flexible water-resistant mortar according to claim 1, characterized in that: The amount of water added in the premixed water is 16-19% of the total mass of the dry materials.

4. The method for preparing a flexible water-resistant mortar according to claim 1, characterized in that: The amount of polymer emulsion added in the emulsion addition is 35-45 kg per ton of dry material.

5. The method for preparing a flexible water-resistant mortar according to claim 1, characterized in that: The stirring speed during the addition of the additives is 60-80 r / min, and the time is 3-5 minutes.

6. The method for preparing a flexible water-resistant mortar according to claim 1, characterized in that: The amount of nano-silica added is 7-9 kg per ton of dry material.

7. The method for preparing a flexible water-resistant mortar according to claim 1, characterized in that: The amount of cellulose ether added is 1.8-2.2 kg per ton of dry material.

8. The method for preparing a flexible water-resistant mortar according to claim 1, characterized in that: The filler is added at a rate of 45-55 kg per ton of dry material.

9. The method for preparing a flexible water-resistant mortar according to claim 1, characterized in that: The quality tests include: consistency, tensile bond strength, elongation at break, and impermeability pressure.