A permeable crystalline waterproofing material with ultra-high resistance to osmotic pressure

Abstract

The application provides a permeation crystallization waterproof material with super-high anti-permeation pressure, and relates to the field of waterproof materials.The permeation crystallization waterproof material with super-high anti-permeation pressure comprises the following components by weight: Portland cement (40-60%), fly ash (1-10%), quartz sand (30-50%), hydroxyl modified molecular sieve crystallization masterbatch (1-10%), water reducing agent (0.2-1%), retarder (0.1-0.5%), anti-cracking agent (0.1-0.5%) and defoaming agent (0.1-1%).The preparation process is that the Portland cement, the quartz sand and the fly ash are premixed first.The permeation crystallization waterproof material with super-high anti-permeation pressure has a certain amount of moisture in the CCCW coating by using the super-large specific surface area of the molecular sieve, the water participates in the hydration reaction by releasing water, and the free calcium is captured, a large number of needle-shaped or linear crystals are found in the interior by electron microscopy characterization, a network structure with the molecular sieve as the skeleton is formed, and the anti-permeation performance is improved to 3.8 MPa.

Description

Technical Field

[0001] This invention relates to the field of waterproof materials technology, specifically to a penetrating crystalline waterproof material with ultra-high resistance to osmotic pressure. Background Technology

[0002] In the modern construction industry, waterproofing is a crucial aspect of ensuring structural safety and extending the service life of buildings. Traditional waterproofing methods, such as rolled waterproofing membranes and coatings, while meeting waterproofing requirements to some extent, often suffer from problems such as complex construction, high maintenance costs, and susceptibility to aging. The emergence of penetrating crystalline waterproofing materials, with their unique waterproofing mechanism, excellent durability, and environmentally friendly properties, has brought new waterproofing solutions to the construction industry, demonstrating significant potential, especially in complex structures and high-requirement waterproofing projects.

[0003] Cement-based penetrating crystalline waterproofing materials primarily function through the penetrating crystallization reaction of active chemical substances. Current research generally classifies these mechanisms into two main categories: precipitation reaction mechanism and complexation reaction-precipitation mechanism. To improve the impermeability of cement-based penetrating crystalline waterproofing materials (CCCW), researchers have studied the performance of these materials from the perspectives of dosage, water-cement ratio, and the addition of nano-modifiers. To date, research has focused on enhancing the activity of penetrating components or strengthening the curing process to form crystals. There is relatively little research on promoting the crystallization of substances with low internal water content and those not involved in hydration reactions, or on how to capture calcium ions in hydration products. Summary of the Invention

[0004] The purpose of this invention is to provide a permeable crystalline waterproof material with ultra-high resistance to osmotic pressure, thereby solving the problems mentioned in the background art.

[0005] Technical solution

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a permeable crystalline waterproof material with ultra-high resistance to osmotic pressure, wherein the raw materials contain the following components by weight: silicate cement (40-60%), fly ash (1-10%), quartz sand (30-50%), hydroxyl-modified molecular sieve crystal masterbatch (1-10%), water-reducing agent (0.2-1%), retarder (0.1-0.5%), crack-resistant agent (0.1-0.5%), and defoamer (0.1-1%).

[0007] Furthermore, the preparation process involves first premixing silicate cement, quartz sand, and fly ash, then adding hydroxylated modified molecular sieve crystallizing masterbatch, water-reducing agent, retarder, and crack-resistant agent for biaxial dispersion for 30 minutes, and finally adding defoamer for dispersion for 15 minutes.

[0008] Furthermore, the silicate cement is one or more of 425 and 525.

[0009] Furthermore, the silica content in the fly ash is greater than 50%.

[0010] Furthermore, the silica content in the quartz sand is greater than 98%, and the particle size is between 80-120 mesh. The water-reducing agent is one or more of sodium lignosulfonate, maleic anhydride polyether, and aminosulfonate formaldehyde condensate. The retarder is one or more of sodium gluconate, sodium citrate, sodium tartrate, and tetrasodium EDTA.

[0011] Furthermore, the crack-resistant agent is polypropylene fiber, and the defoamer is an organosilicon or polyether defoamer.

[0012] Furthermore, the hydroxyl-modified molecular sieve crystallization masterbatch is composed of hydroxylated modified molecular sieve (40-70%), precipitant (20-50%), nano silica (0.5-5%), and calcium ion supplement (0.1-2%). The hydroxyl-modified molecular sieve crystallization masterbatch can be obtained by mixing the components evenly in proportion.

[0013] Furthermore, the preparation process of the hydroxylated modified molecular sieve is as follows:

[0014] (1) Grind ZSM-5 molecular sieve to select a particle size of 1-10μm, then vacuum dry at 100℃ for 6h to remove water, add deionized water and tetraethyl orthosilicate in a ratio of ZSM-5:water:tetraethyl orthosilicate = 10:100:2, put it into a high temperature reactor, heat it to 180℃, keep it at a constant temperature for 24h, and then cool it to room temperature.

[0015] (2) Centrifuge separation, wash with a mixture of deionized water and ethanol, vacuum dry at 80℃, grind and sieve to select particles with a diameter of 1-10μm.

[0016] Furthermore, the molecular sieve is a molecular sieve that can stably maintain its pore size during hydrothermal reactions, such as ZSM-5 molecular sieve or M-41 molecular sieve; the precipitant is one or more of sodium silicate, potassium silicate, sodium carbonate, and sodium sulfate; and the calcium ion supplement is one or more of calcium formate, calcium acetate, and calcium hydroxide.

[0017] This invention provides a penetrating crystallization waterproof material with ultra-high resistance to osmotic pressure. It possesses the following beneficial effects:

[0018] This permeable crystalline waterproof material with ultra-high osmotic pressure resistance utilizes the large specific surface area of ​​molecular sieves to allow a certain amount of moisture to remain inside the CCCW coating. By releasing moisture to participate in the hydration reaction and simultaneously capturing free calcium, electron microscopy characterization revealed the formation of a large number of crisscrossing needle-like or linear crystals inside, forming a layered network structure with molecular sieves as the framework, significantly improving the impermeability to 3.8 MPa. Attached Figure Description

[0019] Figure 1 This is a table illustrating the test results of the present invention;

[0020] Figure 2 This is a schematic diagram of the SET test of the sample of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figure 1-2 As shown, this embodiment of the invention provides a penetrating crystalline waterproof material with ultra-high osmotic pressure resistance. The raw materials contain the following components by weight: silicate cement (40-60%), fly ash (1-10%), quartz sand (30-50%), hydroxyl-modified molecular sieve crystal masterbatch (1-10%), water-reducing agent (0.2-1%), retarder (0.1-0.5%), crack-resistant agent (0.1-0.5%), and defoamer (0.1-1%).

[0023] The hydroxylated modified molecular sieve crystallization masterbatch in the examples was prepared by the following method: 60% of the hydroxylated modified molecular sieve, 20% sodium silicate, 10% sodium carbonate, 7% sodium sulfate, 2% nano silica, and 1% calcium acetate were mixed in proportion and stirred for 4 hours to obtain the crystallization masterbatch.

[0024] The hydroxylated modified molecular sieves in the examples were prepared using the following method: ZSM-5 molecular sieves were ground to select particles with a diameter of 1-10 μm, then vacuum dried at 100°C for 6 hours to remove water. Deionized water and tetraethyl orthosilicate were added to the sieve in a ratio of ZSM-5:water:tetraethyl orthosilicate = 10:100:2. The sieve was then placed in a high-temperature reactor, heated to 180°C, held at that temperature for 24 hours, and cooled to room temperature. After centrifugation, the sieves were washed with a mixture of deionized water and ethanol, vacuum dried at 80°C, and then ground and sieved to select particles with a diameter of 1-10 μm.

[0025] The sample preparation and testing methods in the examples all refer to GB / 18445-2012.

[0026] Example 1

[0027] A penetrating crystalline waterproofing material with ultra-high osmotic pressure resistance is composed of the following components: 45% 425 cement, 5% fly ash, 45.5% quartz sand, 3% hydroxylated modified molecular sieve crystal masterbatch, 0.3% sodium lignosulfonate, 0.2% tetrasodium EDTA, 0.5% polypropylene fiber, and 0.5% organosilicon defoamer.

[0028] Example 2

[0029] A penetrating crystalline waterproofing material with ultra-high osmotic pressure resistance is composed of the following components: 45% 425 cement, 5% fly ash, 47.5% quartz sand, 1% hydroxylated modified molecular sieve crystal masterbatch, 0.3% sodium lignosulfonate, 0.2% tetrasodium EDTA, 0.5% polypropylene fiber, and 0.5% organosilicon defoamer.

[0030] Example 3

[0031] A penetrating crystalline waterproofing material with ultra-high osmotic pressure resistance is composed of the following components: 45% 425 cement, 5% fly ash, 43.5% quartz sand, 5% hydroxylated modified molecular sieve crystal masterbatch, 0.3% sodium lignosulfonate, 0.2% tetrasodium EDTA, 0.5% polypropylene fiber, and 0.5% organosilicon defoamer.

[0032] Test results are as follows Figure 1 As shown, by Figure 1 As shown in the data table, the anti-permeability crystalline waterproofing material in Implementation Case 1 has the best anti-permeability performance, far exceeding the 0.8MPa specified in the national standard GB / 18445-2012.

[0033] Although 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 penetrating crystalline waterproof material with ultra-high resistance to osmotic pressure, characterized in that: The raw materials, by weight, comprise the following components: 40-60% silicate cement, 1-10% fly ash, 30-50% quartz sand, 1-10% hydroxyl-modified molecular sieve crystallization masterbatch, 0.2-1% water-reducing agent, 0.1-0.5% retarder, 0.1-0.5% crack-resistant agent, and 0.1-1% defoamer. The hydroxyl-modified molecular sieve crystallization masterbatch consists of 40-70% hydroxylated modified molecular sieve, 20-50% precipitant, 0.5-5% nano-silica, and 0.1-2% calcium ion additive. The hydroxyl-modified molecular sieve crystallization masterbatch is obtained by uniformly mixing the components in the specified proportions. The preparation process of the hydroxylated modified molecular sieve is as follows: (1) Grind ZSM-5 molecular sieve to select a particle size of 1-10 μm, then vacuum dry at 100℃ for 6 h to remove water, add deionized water and tetraethyl orthosilicate in a ratio of ZSM-5: water: tetraethyl orthosilicate = 10: 100: 2, put it into a high temperature reactor, heat it to 180℃, keep it at a constant temperature for 24 h, and cool it to room temperature; (2) Centrifuge separation, wash with a mixture of deionized water and ethanol, vacuum dry at 80℃, grind and sieve to select particles with a diameter of 1-10μm; The precipitant is one or more of sodium silicate, potassium silicate, sodium carbonate, and sodium sulfate, and the calcium ion supplement is one or more of calcium formate, calcium acetate, and calcium hydroxide.

2. The water-repellent crystalline waterproofing material with ultra-high osmotic pressure resistance according to claim 1, characterized in that: The preparation process involves first premixing silicate cement, quartz sand and fly ash, then adding hydroxylated modified molecular sieve crystal masterbatch, water-reducing agent, retarder and crack-resistant agent for biaxial dispersion for 30 minutes, and finally adding defoamer for dispersion for 15 minutes.

3. The water-repellent crystalline waterproofing material with ultra-high osmotic pressure resistance according to claim 1, characterized in that: The silicate cement is one or more of 425 and 525.

4. The penetrating crystallization waterproof material with ultra-high osmotic pressure resistance according to claim 1, characterized in that: The fly ash contains more than 50% silica.

5. A penetrating crystallization waterproof material with ultra-high osmotic pressure resistance according to claim 1, characterized in that: The silica content of the quartz sand is greater than 98%, and the particle size is 80-120 mesh. The water-reducing agent is one or more of sodium lignosulfonate, maleic anhydride polyether, and aminosulfonate formaldehyde condensate. The retarder is one or more of sodium gluconate, sodium citrate, sodium tartrate, and tetrasodium EDTA.

6. The water-repellent crystalline waterproofing material with ultra-high osmotic pressure resistance according to claim 1, characterized in that: The crack-resistant agent is polypropylene fiber, and the defoamer is an organosilicon or polyether defoamer.

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