Indoor decoration ceiling moisture-proof material and preparation method thereof

Abstract

The present application belongs to the field of indoor ceiling moisture-proof, and discloses an indoor decoration ceiling moisture-proof material and a preparation method. The material comprises liquid material and powder material. The liquid material comprises the following components: acrylic emulsion, epoxy modified water absorbing resin, water and first additive. The powder material comprises the following components: heavy powder material, light filler and second additive, and optionally humidity adjusting functional filler. The ceiling moisture-proof material has the advantages of light weight, easy coating, smooth brushing, moisture absorption, moisture release and condensation water drop prevention in addition to the water resistance and impermeability of traditional polymer cement-based waterproof materials.

Description

Technical Field

[0001] This invention belongs to the field of indoor ceiling moisture-proofing, and more specifically, relates to an indoor decoration ceiling moisture-proofing material and its preparation method. Background Technology

[0002] In building interior waterproofing projects, people often focus on waterproofing side walls and floors, but neglect ceiling damp-proofing. The formulation and implementation of the national standard GB 55030-2022, "General Specification for Waterproofing of Buildings and Municipal Engineering," has played a positive role in promoting indoor ceiling damp-proofing. However, a search of existing technical data in the field of indoor ceiling damp-proofing revealed no information for comparison or reference with existing ceiling damp-proofing materials. Using polymer cement-based waterproofing materials for side walls and floors as ceiling materials in damp areas has the following disadvantages:

[0003] First, the high density of powders such as cement and sand makes ceiling construction laborious and affects construction efficiency. Furthermore, traditional, relatively rigid moisture-proof materials are prone to sagging under gravity.

[0004] Secondly, polymer cement-based moisture-proof materials used in ceiling construction are prone to condensation in high humidity environments and do not have humidity regulation functions.

[0005] Specifically, due to the influence of gravity, ceiling coatings are prone to problems such as dripping, collapse, and peeling during application, placing higher demands on the control of the flow state of ceiling moisture-proof coatings. At the same time, the laborious roller application by workers is strenuous, making the development of labor-saving and easy-to-apply roller-coated products an important consideration. CN202210728408 discloses a novel lightweight and easy-to-apply polymer waterproof coating. This technology uses acrylic emulsion to coat perlite, and the closed-cell treatment ensures the overall density of the coating, which helps with easy application. However, the closed-cell powder loses its natural porous structure and reduces its specific surface area, thus losing its moisture absorption function and failing to meet the moisture absorption requirements of ceiling moisture-proof materials.

[0006] In damp spaces, condensation and dripping water easily form on the ceiling due to temperature and humidity differences, causing considerable inconvenience. Compounds with hydrophilic groups such as -OH, -COOH, -SO3H, and -NH2 are widely used in moisture-absorbing materials, but they are prone to swelling and dissolving in humid environments over time, significantly reducing the adhesion between the material and the substrate and shortening its lifespan.

[0007] Therefore, given that existing polymer cement waterproofing products do not have the property of preventing water droplets from condensing, and that their high density makes them prone to dripping and difficult to install when used in ceiling construction, there is an urgent need to propose a new type of moisture-proof material for interior ceiling decoration and its preparation method. Summary of the Invention

[0008] This invention addresses the shortcomings of existing technologies by proposing an indoor ceiling moisture-proof material and its preparation method. In addition to the waterproof and impermeable properties of traditional polymer cement-based waterproof materials, the ceiling moisture-proof material of this invention also possesses the advantages of being lightweight, easy to apply, smooth to brush, and capable of absorbing and releasing moisture while preventing condensation.

[0009] To achieve the above objectives, the first aspect of the present invention provides an interior decoration ceiling moisture-proof material, the material comprising liquid and powder;

[0010] The liquid material comprises the following components: acrylic emulsion, epoxy-modified water-absorbing resin, water, and a first auxiliary agent;

[0011] The powder comprises the following components: heavy powder, light filler and second additive, and optionally a moisture-regulating filler.

[0012] According to the present invention, preferably,

[0013] The liquid comprises the following components by weight: 15-50 parts acrylic emulsion, 10-35 parts epoxy-modified water-absorbing resin, 30-65 parts water, and 0.1-7 parts first auxiliary agent.

[0014] The powder comprises the following components by weight: 2-140 parts of heavy powder, 2-10 parts of light filler, 1-10 parts of humidity regulating filler, and 0.1-2.5 parts of a second additive.

[0015] According to the present invention, preferably, the first adjuvant comprises the following components in parts by weight: 0.1-1 parts of defoamer, 0.1-0.5 parts of bactericide, 0.1-1 parts of dry film antifungal agent, 0.1-1 parts of wetting and dispersing agent, and 1-3 parts of first thickener.

[0016] According to the present invention, preferably, the heavy powder comprises the following components in parts by weight: 30-60 parts cement, 2-15 parts quartz sand and 30-70 parts heavy calcium carbonate.

[0017] According to the present invention, preferably, the lightweight filler is at least one selected from hollow glass microspheres, closed-cell expanded perlite, hollow acrylic resin, fly ash, and ceramic hollow microspheres.

[0018] According to the present invention, preferably, the humidity regulating filler is at least one of sepiolite powder, open-pore expanded perlite, and diatomaceous earth.

[0019] In this invention, the humidity-regulating filler material is mostly a porous powder, which regulates ambient humidity through high porosity. In addition to the humidity-regulating filler material, this application also introduces epoxy-modified water-absorbing resin to enhance the absorption and regulation of water vapor. The combination of these two methods achieves a higher water vapor absorption capacity.

[0020] According to the present invention, preferably, the second additive comprises the following components in parts by weight: 0.1-0.4 parts of a second thickener and 0.1-2 parts of a water-reducing agent.

[0021] According to the present invention, preferably, the first thickener is a hydrophobically modified alkali-swellable associative thickener.

[0022] According to the present invention, preferably, the second thickener is at least one of hydroxypropyl methylcellulose, starch ether and bentonite.

[0023] According to the present invention, preferably, the epoxy-modified water-absorbing resin is prepared by reacting polyvinyl alcohol, water-based epoxy resin and polyethyleneimine under the conditions of solvent, pH adjuster and crosslinking agent.

[0024] According to the present invention, preferably, the mass ratio of polyvinyl alcohol, waterborne epoxy resin, polyethyleneimine, solvent and crosslinking agent is (3-8):(30-40):(3-7):(40-50):(0.3-2).

[0025] According to the present invention, preferably, the solvent is water.

[0026] According to the present invention, preferably, the crosslinking agent is an isocyanate trimer.

[0027] According to the present invention, preferably, the preparation method of the epoxy-modified superabsorbent resin includes:

[0028] (1) The solvent and polyvinyl alcohol are mixed and stirred at a first temperature to obtain a mixture;

[0029] (2) The mixture is mixed and stirred with water-based epoxy resin at a second temperature to obtain a first product;

[0030] (3) The first product is mixed and stirred with polyethyleneimine at a third temperature to obtain the second product;

[0031] (4) The second product is mixed with a crosslinking agent for secondary crosslinking. The pH value of the crosslinking system is adjusted to 6-7 by a pH adjuster to finally obtain the epoxy modified water-absorbing resin.

[0032] According to the present invention, preferably, in step (1), the first temperature is 85-95°C and the mixing time is 0.8-1.2h.

[0033] According to the present invention, preferably, in step (2), the second temperature is 70-85°C and the mixing time is 0.8-1.2h.

[0034] According to the present invention, preferably, in step (3), the third temperature is 65-75°C and the mixing time is 1.8-2.2h.

[0035] According to the present invention, preferably, in step (4), the pH adjuster used to adjust the pH value is glacial acetic acid / or a 1% hydrochloric acid aqueous solution; preferably, the mass ratio of the glacial acetic acid to the polyethyleneimine is (0.2-0.5):(3-7).

[0036] In this invention, as a preferred embodiment, the preparation method of the epoxy-modified superabsorbent resin includes: adding water to a reaction vessel, heating to 90°C, adding polyvinyl alcohol, stirring at this temperature for 1 hour, and then cooling to 80°C to obtain a mixture; slowly adding water-based epoxy resin dropwise to the mixture at a controlled rate, stirring at 80°C for 1 hour to obtain a first product; cooling to 70°C, adding polyethyleneimine dropwise to the first product, stirring at a constant temperature for 2 hours to obtain a second product; adding a crosslinking agent to the second product for secondary crosslinking, adding glacial acetic acid to adjust the pH of the crosslinking system to 6-7, and stopping stirring when cooling to room temperature to obtain an epoxy-modified superabsorbent resin.

[0037] In this invention, polyvinyl alcohol contains a large number of -OH groups, and polyethyleneimine contains a large number of amino groups. After the epoxy resin ring is opened, both ends are connected to -OH and -NH2. The proportion of these two hydrophilic groups in the entire molecular chain directly affects the water absorption capacity of the indoor ceiling moisture-proof material of this invention after film formation. Therefore, the proportion of each component is very important. Adding a crosslinking agent (with a trifunctional group -NCO) can consume the low-activity amino and hydroxyl groups to achieve secondary crosslinking. Furthermore, in this invention, the waterborne epoxy resin has excellent adhesive properties and, as the main adhesive, can provide excellent adhesion, ensuring long-term wet adhesion of the hydrophilic ends. In this invention, the synergistic effect of the epoxy-modified water-absorbing resin and the acrylic emulsion can achieve adhesion to the substrate. The ceiling moisture-proof material product made using the epoxy-modified water-absorbing resin of this invention can enhance the adhesion to the substrate by approximately 23%, for example, from 1.7 MPa to 2.1 MPa.

[0038] According to the present invention, preferably, the mass ratio of the liquid to the powder is 1:(1.0-2.5).

[0039] According to the present invention, preferably, the wet density of the indoor ceiling moisture-proof material is 1.0-1.6 g / ml.

[0040] A second aspect of the present invention provides a method for preparing the aforementioned indoor ceiling moisture-proof material, the method comprising:

[0041] The acrylic emulsion, epoxy-modified water-absorbing resin, water, and the first additive are mixed and stirred evenly to obtain the liquid material.

[0042] The heavy powder, light filler, second additive, and optionally humidity-regulating filler are mixed and stirred evenly to obtain the powder.

[0043] The beneficial effects of the technical solution of the present invention are as follows:

[0044] In addition to the waterproof and impermeable properties of traditional polymer cement-based waterproof materials, the ceiling moisture-proof material of this invention also has the advantages of being lightweight, easy to apply, smooth to brush, and absorbing and releasing moisture to prevent condensation.

[0045] This invention introduces an epoxy-modified water-absorbing resin and a humidity-regulating filler, which effectively prevent water vapor from condensing into droplets in high-humidity environments. Simultaneously, the coating, having absorbed water vapor, slowly releases the absorbed moisture when the environment changes to low humidity, thus achieving humidity regulation. The ceiling moisture-proof material of this invention showed no significant performance degradation after 20 cycles under both high and low humidity conditions.

[0046] The present invention introduces epoxy-modified water-absorbing resin, which can enhance the adhesion to the substrate by about 23%. The secondary cross-linked epoxy-modified water-absorbing resin has high adhesive strength and wet strength retention rate, achieving long-term durability in a humid state.

[0047] This invention introduces lightweight fillers and combines them with two thickeners, achieving a very smooth application experience. The introduction of lightweight fillers reduces the wet density of the ceiling waterproofing material from 1.67 g / ml to 1.32 g / ml. Under the same weight and coating thickness, this invention allows for 26% more coating coverage compared to traditional polymer cement-based waterproofing materials. The lightweight design effectively reduces the effort required for workers to lift their arms when applying the material, and the lighter weight also reduces the likelihood of the material sagging due to gravity.

[0048] Other features and advantages of the present invention will be described in detail in the following detailed description section. Detailed Implementation

[0049] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0050] In the following embodiments:

[0051] The polyvinyl alcohol is Changchun Chemical BP20;

[0052] The polyethyleneimine was manufactured by Guangzhou Meigu Chemical Co., Ltd., with a molecular weight of 2000.

[0053] The waterborne epoxy resin is selected from Shanghai Hanzhong Chemical H122;

[0054] The crosslinking agent is an isocyanate trimer, Wanhua Company HT-100;

[0055] The acrylic emulsion is BASF ECO-7537;

[0056] The defoamer is Anhui Guangcheng New Materials C30;

[0057] The bactericides are Torchem DB20 and MBS5050;

[0058] The dry film antifungal agent is Tol Chemical OTW;

[0059] The wetting and dispersing agent is NOPCALL LX-7;

[0060] The first thickener is a hydrophobically modified alkali-swellable associative thickener, high shear type, Dow DR-7700;

[0061] The lightweight filler is hollow glass microspheres;

[0062] The humidity regulating filler is sepiolite powder;

[0063] The water-reducing agent is a polycarboxylate type water-reducing agent, Yuhong CR-P818.

[0064] Example 1

[0065] This embodiment provides an indoor ceiling moisture-proof material, which includes a liquid and a powder; the mass ratio of the liquid to the powder is 1:1.5.

[0066] The liquid comprises the following components by weight: 20 parts acrylic emulsion, 30 parts epoxy modified water-absorbing resin, 60 parts water, 0.5 parts defoamer, 0.1 parts bactericide, 0.5 parts dry film mildew inhibitor, 0.3 parts wetting and dispersing agent, and 1.6 parts first thickener;

[0067] The powder comprises the following components by weight: 40 parts cement, 7 parts quartz sand, 40 parts heavy calcium carbonate, 8 parts lightweight filler, 5 parts humidity-regulating filler, 0.3 parts second thickener HPMC (hydroxypropyl methylcellulose), and 1 part water-reducing agent.

[0068] The preparation method of the epoxy-modified superabsorbent resin includes: adding water to a reaction vessel, heating to 90°C, adding polyvinyl alcohol, stirring at the same temperature for 1 hour, and then cooling to 80°C to obtain a mixture; slowly adding water-based epoxy resin dropwise to the mixture at a controlled rate, stirring at 80°C for 1 hour to obtain a first product; cooling to 70°C, adding polyethyleneimine dropwise to the first product, stirring at a constant temperature for 2 hours to obtain a second product; adding a crosslinking agent to the second product for secondary crosslinking, adding glacial acetic acid to adjust the pH of the crosslinking system to 6-7, and stopping stirring when cooling to room temperature to obtain an epoxy-modified superabsorbent resin.

[0069] Example 2

[0070] This embodiment provides an indoor ceiling moisture-proof material, which includes a liquid and a powder; the mass ratio of the liquid to the powder is 1:1.5.

[0071] The liquid comprises the following components by weight: 20 parts acrylic emulsion, 30 parts epoxy modified water-absorbing resin, 60 parts water, 0.5 parts defoamer, 0.1 parts bactericide, 0.5 parts dry film mildew inhibitor, 0.3 parts wetting and dispersing agent, and 1.6 parts first thickener;

[0072] The powder comprises the following components by weight: 40 parts cement, 12 parts quartz sand, 40 parts heavy calcium carbonate, 8 parts lightweight filler, 0.3 parts second thickener HPMC (hydroxypropyl methylcellulose), and 1 part water-reducing agent.

[0073] The preparation method of the epoxy-modified water-absorbing resin is the same as that in Example 1.

[0074] Comparative Example 1

[0075] This comparative example provides an indoor ceiling moisture-proof material, which includes a liquid and a powder; the mass ratio of the liquid to the powder is 1:1.5.

[0076] The liquid comprises the following components by weight: 30 parts acrylic emulsion, 70 parts water, 0.5 parts defoamer, 0.1 parts bactericide, 0.5 parts dry film antifungal agent, 0.3 parts wetting and dispersing agent, and 1.6 parts first thickener;

[0077] The powder comprises the following components by weight: 40 parts cement, 40 parts quartz sand, 40 parts heavy calcium carbonate, 0.3 parts second thickener HPMC (hydroxypropyl methylcellulose), and 1 part water-reducing agent.

[0078] Comparative Example 2

[0079] This comparative example provides an indoor ceiling moisture-proof material, which includes a liquid and a powder; the mass ratio of the liquid to the powder is 1:1.5.

[0080] The liquid comprises the following components by weight: 20 parts acrylic emulsion, 30 parts epoxy modified water-absorbing resin, 60 parts water, 0.5 parts defoamer, 0.1 parts bactericide, 0.5 parts dry film mildew inhibitor, and 0.3 parts wetting and dispersing agent.

[0081] The powder is the same as in Example 1.

[0082] The preparation method of the epoxy-modified water-absorbing resin is the same as that in Example 1.

[0083] Comparative Example 3

[0084] This comparative example provides an indoor ceiling moisture-proof material, which includes a liquid and a powder; the mass ratio of the liquid to the powder is 1:1.5.

[0085] The liquid material is the same as in Example 1;

[0086] The powder comprises the following components by weight: 40 parts cement, 35 parts quartz sand, 40 parts heavy calcium carbonate, 5 parts humidity-regulating filler, 0.3 parts second thickener HPMC (hydroxypropyl methylcellulose), and 1 part water-reducing agent.

[0087] The preparation method of the epoxy-modified water-absorbing resin is the same as that in Example 1.

[0088] Comparative Example 4

[0089] This comparative example provides an indoor ceiling moisture-proof material, which includes a liquid and a powder; the mass ratio of the liquid to the powder is 1:1.5.

[0090] The liquid comprises the following components by weight: 30 parts acrylic emulsion, 70 parts water, 0.5 parts defoamer, 0.1 parts bactericide, 0.5 parts dry film antifungal agent, 0.3 parts wetting and dispersing agent, and 1.6 parts first thickener;

[0091] The powder comprises the following components by weight: 40 parts cement, 12 parts quartz sand, 40 parts heavy calcium carbonate, 8 parts lightweight filler, 0.3 parts second thickener HPMC (hydroxypropyl methylcellulose), and 1 part water-reducing agent.

[0092] Test case

[0093] This test example measures the physical properties and construction application status of the indoor decoration ceiling moisture-proof materials prepared in various embodiments and comparative examples. The wet density was determined according to GB / T 7650-2007 "Determination of density of paints and varnishes - specific gravity bottle method", and the adhesive strength and impermeability were determined according to GB / T 23445-2009 "Polymer cement waterproof coatings". The results are shown in Table 1 below.

[0094] Table 1

[0095]

[0096]

[0097] Note: ● indicates qualified, × indicates unqualified.

[0098] According to Table 1:

[0099] Compared with Example 1, Comparative Example 3 did not have lightweight fillers in its formulation design. The lightweight fillers were replaced with quartz sand by volume ratio. As can be seen from Table 1, the material in Comparative Example 3 experienced severe sagging after construction and the construction was laborious.

[0100] Compared with Example 1, Comparative Example 4 did not have epoxy-modified water-absorbing resin and humidity-regulating filler in its formulation design. The humidity-regulating filler was replaced with quartz sand by volume ratio. As can be seen from Table 1, the material of Comparative Example 4 has no humidity-regulating properties and is prone to water droplets forming on the surface due to humidity. At the same time, the introduction of epoxy-modified water-absorbing resin has an enhancing effect on the adhesion of the substrate.

[0101] Compared with Comparative Example 4, Example 2 added epoxy-modified water-absorbing resin to the formulation design but did not include humidity-regulating filler. The humidity-regulating filler was replaced with quartz sand by volume ratio. As can be seen from Table 1, epoxy-modified water-absorbing resin has an enhancing effect on the adhesion of the substrate. Moreover, the humidity-regulating performance of the material is significantly improved with or without epoxy-modified water-absorbing resin, even without the addition of humidity-regulating filler.

[0102] Compared to Example 1, Comparative Example 1 lacks lightweight fillers in its formulation design, resulting in material sagging during construction. Comparative Example 1 also lacks epoxy-modified absorbent resin and humidity-regulating fillers; the humidity-regulating fillers and lightweight fillers were replaced with quartz sand by volume ratio. Consequently, the material in Comparative Example 1 lacks humidity-regulating properties, is prone to water droplet formation on its surface due to humidity, and exhibits low adhesion to the substrate.

[0103] Compared with Example 1, Comparative Example 2 does not have a first thickener in its formulation design. The finished product of Comparative Example 2 is adjusted to the target viscosity using only the second thickener HPMC. As can be seen from Table 1, the material of Comparative Example 2 has a poor feel during application and is prone to splashing when roller coated.

[0104] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An indoor ceiling moisture-proof material, characterized in that, The materials include liquids and powders; The liquid comprises the following components by weight: 15-50 parts acrylic emulsion, 10-35 parts epoxy-modified water-absorbing resin, 30-65 parts water, and 0.1-7 parts first auxiliary agent. The first additive comprises the following components in parts by weight: 0.1-1 parts of defoamer, 0.1-0.5 parts of bactericide, 0.1-1 parts of dry film mildew inhibitor, 0.1-1 parts of wetting and dispersing agent, and 1-3 parts of first thickener; The first thickener is a hydrophobically modified alkali-swellable associative thickener; The epoxy-modified water-absorbing resin is prepared by reacting polyvinyl alcohol, water-based epoxy resin and polyethyleneimine under the conditions of solvent, pH adjuster and crosslinking agent; The mass ratio of polyvinyl alcohol, waterborne epoxy resin, polyethyleneimine, solvent and crosslinking agent is (3-8):(30-40):(3-7):(40-50):(0.3-2). The solvent is water; The crosslinking agent is an isocyanate trimer; The preparation method of the epoxy-modified water-absorbing resin includes: (1) The solvent and polyvinyl alcohol are mixed and stirred at a first temperature to obtain a mixture; (2) The mixture is mixed and stirred with water-based epoxy resin at a second temperature to obtain the first product; (3) The first product is mixed and stirred with polyethyleneimine at a third temperature to obtain the second product; (4) The second product is mixed with a crosslinking agent for secondary crosslinking. The pH value of the crosslinking system is adjusted to 6-7 by a pH adjuster to finally obtain the epoxy modified water-absorbing resin. The powder comprises the following components by weight: 2-140 parts of heavy powder, 2-10 parts of light filler, 1-10 parts of humidity regulating filler, and 0.1-2.5 parts of a second additive. The second additive comprises the following components in parts by weight: 0.1-0.4 parts of a second thickener and 0.1-2 parts of a water-reducing agent; The second thickener is at least one of hydroxypropyl methylcellulose, starch ether, and bentonite; The mass ratio of the liquid to the powder is 1:(1.0-2.5).

2. The indoor ceiling moisture-proof material according to claim 1, wherein, The heavy powder material comprises the following components by weight: 30-60 parts cement, 2-15 parts quartz sand and 30-70 parts heavy calcium carbonate; The lightweight filler is at least one of hollow glass microspheres, closed-cell expanded perlite, hollow acrylic resin, fly ash, and ceramic hollow microspheres. The humidity regulating filler is at least one of sepiolite powder, open-pore expanded perlite, and diatomaceous earth.

3. The indoor ceiling moisture-proof material according to claim 1, wherein, In (1), the first temperature is 85-95℃, and the mixing time is 0.8-1.2h; In step (2), the second temperature is 70-85℃, and the mixing time is 0.8-1.2h; In step (3), the third temperature is 65-75℃, and the mixing time is 1.8-2.2h; In (4), the pH adjuster is glacial acetic acid and / or a 1% hydrochloric acid solution.

4. The indoor ceiling moisture-proof material according to claim 3, wherein, The mass ratio of the glacial acetic acid to the polyethyleneimine is (0.2-0.5):(3-7).

5. The interior ceiling moisture-proof material according to any one of claims 1-4, wherein, The wet density of the indoor ceiling moisture-proof material is 1.0-1.6 g / ml.

6. A method for preparing the indoor ceiling moisture-proof material according to any one of claims 1-5, characterized in that, The preparation method includes: The acrylic emulsion, epoxy-modified water-absorbing resin, water, and the first additive are mixed and stirred evenly to obtain the liquid material. The heavy powder, light filler, second additive, and humidity-regulating filler are mixed and stirred evenly to obtain the powder.

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