Dry-mixed mortar thickening agent as well as preparation method and application thereof

Abstract

The invention relates to the technical field of dry-mixed mortar additives, and particularly discloses a dry-mixed mortar thickening agent as well as a preparation method and application thereof. The dry-mixed mortar thickening agent provided by the invention is prepared from the following components in parts by weight: 130 to 200 parts of silicate, 50 to 150 parts of fly ash, 0.05 to 0.12 part of redispersible latex powder, 0.5 to 1.5 parts of polyacrylamide, 10 to 50 parts of waterproof agent and 10 to 20 parts of functional additive, wherein the waterproof agent is selected from one or more of sodium methyl silicate, polysiloxane, isobutyltriethoxysilane and sodium stearate; the invention further provides a preparation method of the dry-mixed mortar thickening agent and application of the dry-mixed mortar thickening agent in dry-mixed mortar. The dry-mixed mortar thickening agent provided by the invention not only can improve the waterproof performance and consistency of the dry-mixed mortar, but also can give consideration to both economical efficiency and environmental protection, and meets the requirements of environmental protection and construction.

Description

Technical Field

[0001] This application relates to the technical field of dry-mixed mortar additives, and particularly relates to a thickening agent for dry-mixed mortar, its preparation method and application. Background Art

[0002] As an important material in modern construction, the performance of dry-mixed mortar directly affects the project quality and construction efficiency. With the rapid development of the construction industry, the performance requirements for mortar are getting higher and higher, especially in terms of waterproof performance and consistency. To meet the increasingly stringent environmental protection standards and engineering requirements, the industry has been continuously exploring new technical means to optimize the comprehensive performance of mortar so that it can maintain good construction effects in various complex environments.

[0003] To solve the problems of insufficient waterproof performance and unsatisfactory consistency of mortar, the following methods are mainly adopted in the industry at present: one is to improve the microstructure of mortar by introducing specific mineral admixtures, such as silica fume or slag powder; the second is to add fiber materials, such as polyvinyl alcohol fibers or glass fibers, to enhance the overall strength and toughness of mortar; the third is to use chemical additives, such as polycarboxylate superplasticizers or organosilicon compounds, to regulate the fluidity and impermeability of mortar. However, the above traditional methods have obvious limitations in practical applications. For example, due to the need to use a large amount of expensive chemical additives or special materials, the cost increases significantly; moreover, some additives may cause potential harm to the environment and it is difficult to meet the requirements of green environmental protection.

[0004] Therefore, how to develop a technical solution that can significantly improve the waterproof performance and consistency of dry-mixed mortar, reduce costs and environmental impacts has become a technical problem to be solved urgently. Summary of the Invention

[0005] In order to overcome the defect that the existing thickening agents for dry-mixed mortar are difficult to balance the service performance and economic and environmental protection performance, this application provides a thickening agent for dry-mixed mortar, its preparation method and application.

[0006] In the first aspect, this application provides a thickening agent for dry-mixed mortar, adopting the following technical solution: A thickening agent for dry-mixed mortar, comprising the following components in parts by weight: 130 - 200 parts of silicate, 50 - 150 parts of fly ash, 0.05 - 0.12 parts of redispersible latex powder, 0.5 - 1.5 parts of polyacrylamide, 10 - 50 parts of waterproof agent, 10 - 20 parts of functional auxiliary agent.

[0007] The present application provides a thickening agent for dry-mixed mortar. This thickening agent for dry-mixed mortar can significantly improve the waterproof performance and consistency of dry-mixed mortar while effectively reducing costs and minimizing environmental impact, showing great application prospects. Specifically, the reasonable ratio of silicate to fly ash not only enhances the basic strength of the mortar but also utilizes the industrial waste fly ash, reducing the overall material cost and resource waste. The redispersible latex powder can significantly improve the bonding performance and flexibility of the mortar, making the mortar easier to operate during construction and enhancing its durability during long-term use. As an efficient thickening agent, polyacrylamide can form a stable network structure in the mortar, further enhancing the consistency and anti-stratification ability of the mortar, ensuring the consistency and stability of construction. In addition, an interpenetrating network structure can be formed between silicate, redispersible latex powder, and polyacrylamide, further improving the strength and toughness of the mortar. The addition of the waterproof agent can not only effectively seal the internal pores of the mortar to prevent water penetration but also avoid the environmental pollution caused by traditional chemical waterproof agents. The flexible selection of functional additives, such as water-reducing agents, toughening agents, or expansion agents, can be adjusted according to specific engineering requirements, thereby further optimizing the working performance and mechanical properties of the mortar. In summary, the thickening agent for dry-mixed mortar provided by the present application not only achieves a significant breakthrough in terms of service performance but also takes into account economy and environmental protection, providing an efficient, practical, and sustainable development solution for the dry-mixed mortar industry.

[0008] Optionally, the thickening agent for dry-mixed mortar comprises the following components in parts by weight: 130 - 200 parts of silicate, 50 - 150 parts of fly ash, 0.08 - 0.1 part of redispersible latex powder, 0.8 - 1.3 parts of polyacrylamide, 20 - 40 parts of waterproof agent, and 10 - 20 parts of functional additive.

[0009] In some embodiments, the parts by weight of the redispersible latex powder can be 0.05 - 0.08 part, 0.05 - 0.1 part, 0.05 - 0.12 part, 0.08 - 0.1 part, 0.08 - 0.12 part, or 0.1 - 0.12 part.

[0010] In some specific embodiments, the parts by weight of the redispersible latex powder can also be 0.05 part, 0.08 part, 0.1 part, or 0.12 part.

[0011] In some embodiments, the parts by weight of the polyacrylamide can be 0.5 - 0.8 part, 0.5 - 1 part, 0.5 - 1.3 part, 0.5 - 1.5 part, 0.8 - 1 part, 0.8 - 1.3 part, 0.8 - 1.5 part, 1 - 1.3 part, 1 - 1.5 part, or 1.3 - 1.5 part.

[0012] In some specific embodiments, the parts by weight of the polyacrylamide may also be 0.5 part, 0.8 part, 1 part, 1.3 parts or 1.5 parts.

[0013] In some embodiments, the parts by weight of the waterproofing agent may be 10 - 20 parts, 10 - 30 parts, 10 - 40 parts, 10 - 50 parts, 20 - 30 parts, 20 - 40 parts, 20 - 50 parts, 30 - 40 parts, 30 - 50 parts or 40 - 50 parts.

[0014] In some specific embodiments, the parts by weight of the waterproofing agent may also be 10 parts, 20 parts, 30 parts, 40 parts or 50 parts.

[0015] Optionally, the waterproofing agent is selected from one or more of sodium methyl silicate, polysiloxane, isobutyltriethoxysilane and sodium stearate.

[0016] In the present application, by selecting the above substances as the waterproofing agent, not only can the waterproof performance of the dry - mix mortar be significantly improved, ensuring good anti - seepage effect in complex environments, but also the environmental pollution problems brought by traditional additives are avoided, achieving excellent environmental protection performance.

[0017] Optionally, the waterproofing agent is a mixture of sodium methyl silicate and sodium stearate.

[0018] In the present application, further selecting a mixture of sodium methyl silicate and sodium stearate as the waterproofing agent can significantly improve the waterproof performance of the mortar. Specifically, the combination of the above two substances can not only effectively reduce the performance limitations that may be brought by a single waterproofing agent, but also enhance the hydrophobic effect on the surface of the mortar through the synergistic effect of the two components, thereby improving the overall waterproof ability. In addition, on the basis of ensuring excellent waterproof performance, the above substances also avoid the excessive use of a certain chemical substance, reducing the potential impact on the environment.

[0019] In some embodiments, the weight ratio of sodium methyl silicate to sodium stearate may be 2:(0.2 - 0.5), 2:(0.2 - 1), 2:(0.2 - 1.5), 2:(0.5 - 1), 2:(0.5 - 1.5) or 2:(1 - 1.5).

[0020] In a specific embodiment, the weight ratio of sodium methyl silicate to sodium stearate may be 2:0.2, 2:0.5, 2:1 or 2:1.5.

[0021] Optionally, the weight ratio of sodium methyl silicate to sodium stearate is 2:(0.5 - 1).

[0022] Optionally, the functional additive is selected from one or more of water - reducing agents, toughening agents and swelling agents.

[0023] In this application, by adding the above functional additives, the comprehensive performance of dry-mixed mortar can be further optimized, while reducing costs and minimizing environmental impact. Specifically: the addition of a water reducer can effectively reduce water consumption, improve the fluidity and compactness of the mortar, and reduce construction difficulty; the toughening agent can enhance the flexibility and crack resistance of the mortar, improving overall stability; and the expansion agent can compensate for the shrinkage of the mortar during hardening, preventing cracking.

[0024] In a second aspect, this application provides a method for preparing a thickening agent for dry-mixed mortar, comprising the following steps: First, mix silicate, redispersible latex powder, polyacrylamide, waterproofing agent, and functional additives, and stir evenly initially; then, perform a refinement treatment for 20 - 30 min at a stirring speed of ≥1500 rpm; next, add fly ash and perform an ultrasonic treatment for 20 - 30 min at 20 - 30 kHz to form a homogeneous slurry; finally, dry the homogeneous slurry to obtain the thickening agent for dry-mixed mortar.

[0025] Optionally, the drying temperature is ≤60°C.

[0026] In a third aspect, this application provides an application of the thickening agent for dry-mixed mortar in dry-mixed mortar.

[0027] In a fourth aspect, this application provides a dry-mixed mortar comprising the thickening agent for dry-mixed mortar, wherein the mass dosage of the thickening agent for dry-mixed mortar in the dry-mixed mortar is 3 - 5%.

[0028] In some embodiments, the mass dosage of the thickening agent for dry-mixed mortar in the dry-mixed mortar is 3 - 4% or 4 - 5%.

[0029] In a specific embodiment, the mass dosage of the thickening agent for dry-mixed mortar in the dry-mixed mortar is 3%, 4%, or 5%.

[0030] In summary, this application has the following beneficial effects: 1. This application uses silicate, fly ash, redispersible latex powder, polyacrylamide, waterproofing agent, etc. to prepare a thickening agent for dry-mixed mortar. This thickening agent can not only improve the consistency and water resistance of dry-mixed mortar, but also reduce costs and minimize environmental impact, and has good application prospects.

[0031] 2. This application uses a mixture of sodium methyl silicate and sodium stearate as the water repellent in the thickening agent. Through their synergistic effect, the waterproof performance and strength of the mortar can be significantly improved. The water absorption rate of the mortar prepared using the above thickening agent is <2%, the impermeability grade can reach P12, and the 28-day compressive strength is ≥47.0 MPa. Detailed Embodiments

[0032] The present application provides a thickening agent for dry-mixed mortar, which comprises the following components in parts by weight: 130-200 parts of silicate, 50-150 parts of fly ash, 0.05-0.12 parts of redispersible latex powder, 0.5-1.5 parts of polyacrylamide, 10-50 parts of waterproofing agent, 1-10 parts of water reducing agent, 0.15-0.3 parts of toughening agent and 7-10 parts of expanding agent. Further, the thickening agent for dry-mixed mortar comprises the following components in parts by weight: 130-200 parts of silicate, 50-150 parts of fly ash, 0.08-0.1 parts of redispersible latex powder, 0.8-1.3 parts of polyacrylamide, 20-40 parts of waterproofing agent, 10-20 parts of functional additive.

[0033] Among them, the waterproofing agent is selected from one or more of sodium methyl silicate, polysiloxane, isobutyltriethoxysilane and sodium stearate. Further, the waterproofing agent is a mixture of sodium methyl silicate and sodium stearate. Still further, the weight ratio of sodium methyl silicate to sodium stearate is 2:(0.5-1).

[0034] The preparation method of the thickening agent for dry-mixed mortar provided by the present application comprises the following steps: First, mix the silicate, redispersible latex powder, polyacrylamide, waterproofing agent and functional additive, and stir evenly preliminarily; then carry out refinement treatment for 20-30 min at a stirring speed of ≥1500 rpm; then add fly ash and carry out ultrasonic treatment for 20-30 min at 20-30 kHz to form a homogeneous slurry; finally, dry the homogeneous slurry at ≤60 °C to obtain the thickening agent for dry-mixed mortar.

[0035] The present application also provides a dry-mixed mortar, which comprises the thickening agent for dry-mixed mortar, and the mass admixture of the thickening agent for dry-mixed mortar in the dry-mixed mortar is 3-5%.

[0036] In the examples of the present application, the silicate is sodium silicate; the redispersible latex powder is purchased from Xinji Huaqiang Building Materials Factory; the polyacrylamide model is L-WX505 and is purchased from Langfang WoXing Environmental Protection Technology Co., Ltd.; the CAS number of sodium methyl silicate is 16589-43-8; the CAS number of sodium stearate is 822-16-2; the CAS number of isobutyltriethoxysilane is 17980-47-1; the water reducing agent is polycarboxylate water reducing agent PCE-11; the toughening agent model is ZT-2A; the expanding agent model is HP-CSA. The raw materials, reagents, solvents, etc. used in the present application can all be obtained through commercial purchase.

[0037] The following further describes the present application in detail in combination with preparation examples, examples and performance detection tests.

[0038] Preparation Examples 1-12 Preparation Examples 1-12 respectively provide a thickening agent for dry-mixed mortar.

[0039] The differences between the above Preparation Examples are as follows: the addition amounts of the redispersible latex powder, polyacrylamide, and waterproofing agent are shown in Table 1 below.

[0040] The preparation method of the dry-mixed mortar thickening agent provided in Preparation Examples 1-12 includes the following steps: First, mix 350 g of sodium silicate, redispersible latex powder, polyacrylamide, waterproofing agent (sodium methyl silicate), 5 g of water-reducing agent, 0.2 g of toughening agent, and 5 g of expansion agent, and stir evenly initially; then perform a refinement treatment for 20 min at a stirring speed of 1800 rpm; then add 100 g of fly ash and perform an ultrasonic treatment for 30 min at 25 kHz to form a homogeneous slurry; finally, dry the homogeneous slurry at 50 °C to obtain the dry-mixed mortar thickening agent.

[0041] Table 1 Addition amounts of redispersible latex powder, polyacrylamide, and waterproofing agent in Preparation Examples 1-12 Preparation Examples 13-20 Preparation Examples 13-20 respectively provide a dry-mixed mortar thickening agent.

[0042] The differences between the above Preparation Examples and Preparation Example 3 are as follows: the type and ratio of the waterproofing agent are shown in Table 2 below.

[0043] Table 2 Type and ratio of waterproofing agent in Preparation Example 3 and Preparation Examples 13-20 Preparation Example Types and Ratios of Waterproofing Agents 3 Sodium methyl silicate 13 Sodium stearate 14 Isobutyltriethoxysilane 15 Sodium methyl silicate and sodium stearate with a weight ratio of 2:0.2 16 Sodium methyl silicate and sodium stearate with a weight ratio of 2:0.5 17 Sodium methyl silicate and sodium stearate with a weight ratio of 2:1 18 Sodium methyl silicate and sodium stearate with a weight ratio of 2:1.5 19 Isobutyltriethoxysilane and sodium stearate with a weight ratio of 2:1 20 Sodium methyl silicate and isobutyltriethoxysilane with a weight ratio of 2:1 Comparative Preparation Example 1 Comparative Preparation Example 1 provides a dry-mixed mortar thickening agent.

[0044] The differences between the above Comparative Preparation Example and Preparation Example 3 are as follows: the addition amount of the redispersible latex powder is 0.

[0045] Comparative Preparation Example 2 Comparative Preparation Example 2 provides a dry-mixed mortar thickening agent.

[0046] The differences between the above Comparative Preparation Example and Preparation Example 3 are as follows: the addition amount of polyacrylamide is 0.

[0047] Examples 1-20 Examples 1-20 respectively provide a dry-mixed mortar.

[0048] The differences between the above Examples are as follows: the dry-mixed mortar thickening agents used in the dry-mixed mortar respectively come from Preparation Examples 1-20.

[0049] The dry-mixed mortar provided in Examples 1-20 contains: 900 g of quartz sand, 500 g of P.O 42.5 portland cement, 130 g of cellulose ether, 70 g of lignin, and 64 g of dry-mixed mortar thickening agent.

[0050] Example 21 Example 21 provides a dry-mixed mortar.

[0051] The difference between the above example and Example 3 is that the addition amount of the thickening agent for the dry-mixed mortar is 48 g.

[0052] Example 22 Example 22 provides a dry-mixed mortar.

[0053] The difference between the above example and Example 3 is that the addition amount of the thickening agent for the dry-mixed mortar is 80 g.

[0054] Comparative Example 1-2 Comparative Example 1-2 respectively provides a dry-mixed mortar.

[0055] The difference between the above comparative example and Example 3 is that the thickening agents used in the dry-mixed mortar are respectively from Comparative Preparation Examples 1-2.

[0056] Comparative Example 3 Comparative Example 3 provides a dry-mixed mortar.

[0057] The difference between the above comparative example and Example 3 is that the addition amount of the thickening agent for the dry-mixed mortar is 24 g.

[0058] Comparative Example 4 Comparative Example 4 provides a dry-mixed mortar.

[0059] The difference between the above comparative example and Example 3 is that the addition amount of the thickening agent for the dry-mixed mortar is 100 g.

[0060] Performance detection test Add 250 g of water to the dry-mixed mortars provided in Examples 1-22 and Comparative Examples 1-4, stir evenly to obtain the mortar; test the consistency, water absorption, impermeability and cube compressive strength of the mortar according to "Test Methods for Basic Properties of Building Mortars" JGJ / 70-2009, and the results are shown in Table 3 below; Note: The smaller the consistency value, the thicker the mortar; the larger the consistency value, the thinner the mortar. The higher the impermeability grade, the better the impermeability and waterproof performance of the mortar.

[0061] Table 3 Performance detection results of the dry-mixed mortars provided in Examples 1-22 and Comparative Examples 1-4 According to the test results in Table 3, the consistency of the dry-mixed mortar prepared in Examples 1-22 of this application is 70-87 mm, the water absorption rate < 3%, the impermeability grade is P10-P12, and the 28-day compressive strength is 45.1-48.2 MPa. This shows that the thickening agent for dry-mixed mortar provided by this application can significantly improve the consistency, water resistance and impermeability, and compressive strength of the mortar.

[0062] From the test results of Examples 1-12 and Comparative Examples 1-2, it can be seen that the consistency of the dry-mixed mortar prepared in Examples 1-12 with a thickening agent containing redispersible latex powder, polyacrylamide, and waterproof agent is 70-85 mm, the water absorption rate < 3%, the impermeability grade is P10, and the 28-day compressive strength is 45.1-46.7 MPa; while the consistency of the dry-mixed mortar prepared in Comparative Examples 1-2 with a thickening agent without redispersible latex powder or polyacrylamide is only 93-96 mm, the water absorption rate > 3%, the impermeability grade is P10, and the 28-day compressive strength is only 43.2-43.7 MPa. Therefore, it shows that the thickening agent containing redispersible latex powder and polyacrylamide used in this application can prepare mortar with high consistency, good water resistance and high strength.

[0063] From the test results of Example 3 and Examples 13-20, it can be seen that the water absorption rate of the dry-mixed mortar prepared in Example 3 and Examples 13-14 with a thickening agent containing sodium methyl silicate, sodium stearate or isobutyltriethoxysilane < 2.5%, the impermeability grade is P10, and the 28-day compressive strength is 45.7-46.7 MPa; the water absorption rate of the dry-mixed mortar prepared in Examples 19-20 with a thickening agent containing isobutyltriethoxysilane and sodium stearate in a weight ratio of 2:1 or sodium methyl silicate and isobutyltriethoxysilane in a weight ratio of 2:1 < 3%, the impermeability grade is P10, and the 28-day compressive strength is 46.9-47.2 MPa; while the water absorption rate of the dry-mixed mortar prepared in Examples 15-18 with a thickening agent containing sodium methyl silicate and sodium stearate < 2%, the impermeability grade is P12, and the 28-day compressive strength is 47.6-48.2 MPa (≥47.0 MPa). Therefore, it shows that this application preferably uses a mixture of sodium methyl silicate and sodium stearate as the waterproof agent in the thickening agent, and the prepared thickening agent can further improve the water resistance and impermeability and compressive strength of the mortar.

[0064] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A thickening agent for dry-mixed mortar, characterized in that, Comprising the following components in parts by weight: 130 - 200 parts of silicate, 50 - 150 parts of fly ash, 0.05 - 0.12 parts of redispersible latex powder, 0.5 - 1.5 parts of polyacrylamide, 10 - 50 parts of waterproofing agent, 10 - 20 parts of functional additives.

2. The thickening agent for dry-mixed mortar according to claim 1, wherein The dry - mixed mortar thickening agent comprises the following components in parts by weight: 130 - 200 parts of silicate, 50 - 150 parts of fly ash, 0.08 - 0.1 parts of redispersible latex powder, 0.8 - 1.3 parts of polyacrylamide, 20 - 40 parts of waterproofing agent, 10 - 20 parts of functional additives.

3. The thickening agent for dry-mixed mortar according to claim 1, wherein The waterproofing agent is selected from one or more of sodium methyl silicate, polysiloxane, isobutyltriethoxysilane, and sodium stearate.

4. The thickening agent for dry-mixed mortar according to claim 3, characterized in that, The waterproofing agent is a mixture of sodium methyl silicate and sodium stearate.

5. The thickening agent for dry-mixed mortar according to claim 4, characterized in that The weight ratio of sodium methyl silicate to sodium stearate is 2:(0.5 - 1).

6. The thickening agent for dry-mixed mortar according to claim 1, wherein The functional additives are selected from one or more of water - reducing agents, toughening agents, and swelling agents.

7. The preparation method of the thickening agent for dry-mixed mortar according to any one of claims 1-6, characterized in that, Comprising the following steps: Firstly, mix the silicate, redispersible latex powder, polyacrylamide, waterproofing agent, and functional additives, and stir evenly initially; then carry out a refining treatment for 20 - 30 min at a stirring speed of ≥1500 rpm; then add fly ash and carry out an ultrasonic treatment for 20 - 30 min at 20 - 30 kHz to form a homogeneous slurry; finally, dry the homogeneous slurry to obtain the dry - mixed mortar thickening agent.

8. The preparation method of the thickening agent for dry-mixed mortar according to claim 7, characterized in that, The temperature of the drying is ≤60°C.

9. The application of the dry - mixed mortar thickening agent according to any one of claims 1 - 6 in dry - mixed mortar.

10. A dry-mixed mortar comprising the thickening agent for dry-mixed mortar according to any one of claims 1 to 6, characterized in that, The mass dosage of the dry - mixed mortar thickening agent in dry - mixed mortar is 3 - 5%.

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