Super-soft high-water-resistance polymer cement waterproof coating as well as preparation method and application thereof

Abstract

The invention discloses a super-soft high-water-resistance polymer cement waterproof coating which is composed of a component A (a water-resistant emulsion and an auxiliary) and a component B (special cement, quartz sand, a water reducing agent and wood fibers). Through gradient filling of 50-200-mesh quartz sand, three-dimensional reinforcement of wood fibers and optimization of process parameters, the tensile strength retention rate after a coating is soaked in water is larger than or equal to 87%, the watertightness reaches 0.4 MPa / 120 min, and the coating is suitable for a long-term soaking environment. The product has high flexibility (the elongation at break is greater than or equal to 95%), environmental friendliness and the service life of more than 10 years. The device is widely applicable to swimming pools, fire pools, basements, kitchens and bathrooms and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof coatings, and more specifically, to a super-flexible and highly water-resistant polymer cement waterproof coating with excellent flexibility, environmental protection performance and construction performance, and a preparation method and application thereof. Background Art

[0002] Polymer cement waterproof coatings (JS coatings) are widely used in scenarios such as bathrooms and basements because they have both flexibility and adhesiveness and can resist the micro-vibrations and a certain degree of displacement of building structures. However, traditional JS coatings have a high water absorption rate, and long-term immersion in water easily leads to a decrease in coating strength, cracking and leakage, shortening the service life of buildings. In the prior art, although the water resistance can be improved by adjusting the ratio of emulsion to cement, the flexibility or construction performance is often sacrificed. Therefore, developing a waterproof coating with high water resistance, super flexibility, environmental protection and convenient construction is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a super-flexible and highly water-resistant polymer cement waterproof coating and a preparation method thereof. By optimizing the formula and process, the problems of high water absorption rate and poor water resistance of traditional products are solved, while excellent flexibility, environmental protection performance and construction performance are maintained, and it is applicable to swimming pools, fire fighting pools, basements, kitchens and bathrooms, etc.

[0004] To solve the above problems, the present invention adopts the following technical solution: A super-flexible and highly water-resistant polymer cement waterproof coating is composed of component A and component B in a mass ratio of 1:(1 - 1.5);

[0005] Component A includes: 90 - 95 parts of a water-resistant polymer emulsion, 5 - 10 parts of water, 0.2 - 0.5 parts of an antifoaming agent, 0.5 - 1 part of a dispersant, 0.05 - 0.2 parts of a preservative;

[0006] Component B includes: 30 - 50 parts of a special cement, 40 - 60 parts of quartz sand, 0.05 - 1.5 parts of a polycarboxylate water-reducing agent, 1 - 3 parts of wood fiber.

[0007] Preferably, the water-resistant polymer emulsion is a special acrylate emulsion.

[0008] Preferably, in the special cement, Al2O3 ≥ 25%, SO3 is 8% - 14%, The initial setting time ≤ 30 min, the final setting time ≤ 180 min; the compressive strength at 1 day ≥ 30 MPa, and the compressive strength at 28 days ≥ 50 MPa.

[0009] Preferably, the A component and the B component are composed in a mass ratio of 1:1.3. The A component contains 92 parts of a water-resistant polymer emulsion, 6 parts of water, 0.42 parts of an antifoaming agent, 0.65 parts of a dispersant, and 0.12 parts of a preservative;

[0010] The B component contains: 43 parts of special cement, 50 parts of quartz sand, 0.3 parts of a polycarboxylate water reducer, and 2.4 parts of wood fiber.

[0011] Preferably, the particle size of the quartz sand is 50-200 mesh.

[0012] Preferably, the length of the wood fiber is 100-500 μm.

[0013] The present invention also provides a preparation method of a super-flexible and highly water-resistant polymer cement waterproof coating. The A component is dispersed and mixed and then left to stand for defoaming;

[0014] The B component is dry-mixed and then ground to a fineness of ≤80 μm;

[0015] During construction, the A and B components are mixed and stirred for 10-30 minutes at a rotation speed of 1000-2000 rpm.

[0016] Preferably, the fineness of the powder after grinding is ≤80 μm, the mixing rotation speed is 2000 rpm, and the stirring time is 13 minutes.

[0017] A super-flexible and highly water-resistant polymer cement waterproof coating of the present invention is applicable to swimming pools, fire pools, basements, and kitchen and bathroom areas. After curing at 23°C for 14 days, the water impermeability of the coating film reaches 0.4 MPa / 120 min.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] Water resistance: After 14 days of immersion in water, the tensile strength retention rate ≥87%, the adhesive strength retention rate ≥91%, and the water impermeability reaches 0.4 MPa / 120 min;

[0020] Flexibility: The elongation at break ≥95%, and it can resist micro-vibrations and displacements of building structures;

[0021] Environmental protection: No solvent is added, the VOC content approaches zero, and it meets the GB 55030-2022 standard;

[0022] Workability: Good leveling property, the coating film is dense and crack-free, and it is suitable for construction on complex base surfaces;

[0023] Service life: The service life in a long-term immersion water environment ≥10 years, far exceeding that of conventional JS coatings (5-8 years). Specific embodiments

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] Example 1: Component A: 93 parts of acrylate emulsion, 6 parts of water, 0.3 part of defoamer, 0.8 part of dispersant, 0.1 part of preservative;

[0026] Component B: 40 parts of special cement, 50 parts of quartz sand (100 - 200 mesh), 0.8 part of polycarboxylate water reducer, 2 parts of wood fiber.

[0027] Preparation and testing:

[0028] Mix Component A and Component B at a ratio of 1:1 and stir at 1500 rpm for 20 minutes;

[0029] After coating, cure at 23°C for 14 days. Test the tensile strength to be 2.4 MPa and the elongation at break to be 96%;

[0030] The adhesion strength retention rate after 14 days of immersion in water is 92%, and the water impermeability is 0.4 MPa / 120 min.

[0031] Example 2: Component A: 92 parts of acrylate emulsion, 6 parts of water, 0.42 part of defoamer, 0.65 part of dispersant, 0.12 part of preservative;

[0032] Component B: 43 parts of special cement, 50 parts of quartz sand (50 - 200 mesh), 0.3 part of polycarboxylate water reducer, 2.4 parts of wood fiber.

[0033] Preparation and testing:

[0034] Mix Component A and Component B at a ratio of 1:2.3 and stir at 2000 rpm for 18 minutes;

[0035] After coating, cure at 23°C for 14 days. Test the tensile strength to be 2.5 MPa and the elongation at break to be 98%;

[0036] The adhesion strength retention rate after 14 days of immersion in water is 93%, and the water impermeability is 0.4 MPa / 120 min.

[0037] Example 3: High proportion of quartz sand

[0038] Adjustment of Component B: 60 parts of quartz sand (50 - 200 mesh), and the rest is the same as in Example 1;

[0039] Performance: The compressive strength of the coating film is increased to 3.0 MPa, which is suitable for high-pressure environments such as fire fighting pools.

[0040] Example 3: Optimization of Process Parameters

[0041] Process adjustment: The grinding fineness of the powder material is ≤80μm, and the mixing speed is 2000rpm for 15 minutes;

[0042] Effect: The porosity of the coating film is reduced to 5%, and the water impermeability reaches 0.4MPa / 180min.

[0043] At the same time, for the influence of quartz sand particle size and mixing process, there are the following experimental comparisons:

[0044] Comparative Experiment 1 (influence of quartz sand particle size)

[0045] Quartz sand particle size Coating porosity Tensile strength (MPa) Water impermeability (0.4 MPa) Ordinary sand (20 - 40 mesh) 15％ 1.8 Leakage in 60 min The present invention (50 - 200 mesh) 5％ 2.7 Waterproof in 120 min

[0046] Comparative Experiment 2 (influence of mixing process)

[0047] Process conditions Coating uniformity Tensile strength (MPa) 800 rpm × 10 min (comparative example) Local caking 1.8 1500 rpm × 20 min (the present invention) Uniform and defect-free 2.7

[0048] For the waterproof coating of the present invention, the following are selected:

[0049] Water-resistant base material: Special acrylate emulsion is used. Its polar groups react with the hydration products of cement to form a dense network structure, and the adhesion strength retention rate after immersion in water is >80%;

[0050] Quartz sand gradient filling: Among 50 - 200 mesh quartz sand, fine particles (100 - 200 mesh) fill the pores, and coarse particles (50 - 100 mesh) enhance the skeleton support, reducing the porosity of the coating film by 35%;

[0051] Wood fiber reinforcement: The fiber length is 100 - 500μm, forming a three-dimensional network structure to inhibit shrinkage and cracking, and reducing the shrinkage rate of the coating film by ≥20%;

[0052] Process parameters: The rotation speed of the mixing and dispersing machine is 1000 - 2000rpm, the time is 10 - 30 minutes, and the grinding fineness of the powder material is ≤80μm.

[0053] The specific preparation method includes:

[0054] Preparation of Component A: Add the emulsion, water, and additives (defoamer, dispersant, preservative) to the stirring kettle in sequence, disperse evenly, and then stand for defoaming;

[0055] Preparation of Component B: Dry-mix the powder materials (cement, quartz sand, water reducer, wood fiber) and grind them to a fineness of ≤80μm;

[0056] Construction application: Mix the liquid material and powder material at a ratio of 1:1 - 1.5, stir until there are no particles in the slurry, coat it on the base surface, and cure at 23°C for 14 days.

[0057] According to the above formula and process, the waterproof coating of the present invention has:

[0058] Water resistance: After 14 days of immersion in water, the retention rate of tensile strength ≥ 87%, the retention rate of bonding strength ≥ 91%, and the water impermeability reaches 0.4 MPa / 120 min;

[0059] Flexibility: The elongation at break ≥ 95%, which can resist the micro-vibration and displacement of building structures;

[0060] Environmental protection: No solvent added, the VOC content approaches zero, meeting the GB 55030-2022 standard;

[0061] Workability: Good leveling property, the coating film is dense and crack-free, suitable for construction on complex base surfaces;

[0062] Service life: The service life under long-term immersion environment ≥ 10 years, far exceeding that of conventional JS coatings (5 - 8 years).

[0063] It can be widely applied to waterproofing projects in long-term immersion environments (such as swimming pools, fire pools, basements, kitchens, and bathrooms) and complex building structures (such as kitchens, bathrooms, and pipe roots), with characteristics such as high water resistance, super flexibility, and good environmental protection performance.

[0064] The tensile property test is carried out according to the provisions of Article 5 in GB / T 23445-2009 "Polymer Cement Waterproof Coating", and the test is carried out according to 6.5.2 in GB 23440-2009.

[0065] In GB55030-2022 "General Code for Waterproofing of Buildings and Municipal Engineering", polymer cement waterproof coatings are required to be tested.

[0066] The above is only the preferred specific implementation mode of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An ultra-soft highly water-resistant polymer cement waterproof coating, characterized in that: It is composed of component A and component B in a mass ratio of 1:(1-1.5); Component A includes: 90-95 parts of water-resistant high molecular polymer emulsion, 5-10 parts of water, 0.2-0.5 parts of defoaming agent, 0.5-1 parts of dispersant, and 0.05-0.2 parts of preservative; Component B includes: 30-50 parts of special cement, 40-60 parts of quartz sand, 0.05-1.5 parts of polycarboxylic acid water reducer, and 1-3 parts of wood fiber.

2. The ultra-soft highly water-resistant polymer cement waterproof coating according to claim 1, characterized in that: The water-resistant high molecular polymer emulsion is a special acrylic ester emulsion.

3. The ultra-soft highly water-resistant polymer cement waterproof coating according to claim 1, characterized in that: The special cement contains Al2O3≥25%, SO3 is 8%-14%, Initial setting time ≤30min, final setting time ≤180min; 1-day compressive strength ≥30MPa, 28-day compressive strength ≥50MPa.

4. The ultra-soft high water-resistant polymer cement waterproof coating according to claim 1, characterized in that: The component A and the component B are composed in a mass ratio of 1:1.3, and the component A comprises 92 parts of a water-resistant high molecular polymer emulsion, 6 parts of water, 0.42 parts of a defoaming agent, 0.65 parts of a dispersant, and 0.12 parts of a preservative; Component B includes: 43 parts of special cement, 50 parts of quartz sand, 0.3 parts of polycarboxylic acid water reducer, and 2.4 parts of wood fiber.

5. The ultra-soft highly water-resistant polymer cement waterproof coating according to claim 1, characterized in that: The particle size of the quartz sand is 50-200 meshes.

6. The ultra-soft highly water-resistant polymer cement waterproof coating according to claim 1, characterized in that: The length of the wood fiber is 100-500 μm.

7. The method for preparing the ultra-soft highly water-resistant polymer cement waterproof coating according to claims 1-6, characterized in that: Component A is dispersed and mixed and then allowed to stand for defoaming; Component B is dry-mixed and ground to a fineness of ≤80μm; During construction, mix components A and B and stir for 10-30 minutes at a speed of 1000-2000rpm.

8. The preparation method according to claim 7, characterized in that: The powder grinding fineness is ≤80 μm, the mixing speed is 2000 rpm, and the stirring time is 13 minutes.

9. The ultra-soft high water-resistant polymer cement waterproof coating according to claim 1, characterized in that: The coating is suitable for swimming pools, fire pools, basements and kitchens and bathrooms. The coating film has a water impermeability of 0.4 MPa / 120 min after being cured at 23°C for 14 days.

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