An interior wall anti-condensation coating and a method for preparing the same

Abstract

The application discloses an interior wall anti-condensation water coating and a preparation method thereof, wherein the interior wall anti-condensation water coating is prepared by mixing component A and component B at a volume ratio of 5:1; the component A is composed of the following raw materials in parts by weight: water 30-50 parts, defoaming agent 0.5-1 part, preservative 0.5-1 part, ethylene glycol 2-4 parts, dodecanol ester 3-5 parts, polycarboxylic acid sodium salt dispersant 3-5 parts, magnesium aluminum silicate thixotropic agent 0.2-0.5 part, hydroxyethyl cellulose 0.5-1 part, titanium white powder 3-5 parts, talc powder 3-5 parts, heavy calcium 3-5 parts, pH regulator 0.2-0.4 part, acrylic emulsion 30-40 parts and polyurethane thickening agent 0.3-0.6 part; and the component B is vitrified micropearl, and the fineness of the vitrified micropearl is undersize through a 0.3mm aperture screen. The coating disclosed by the application effectively inhibits or reduces the condensation water problem of an interior wall, maintains good construction performance and coating film quality, and has important market value and social significance.

Description

Technical Field

[0001] This invention relates to the field of architectural coatings technology, and more specifically, to a coating for interior walls with excellent anti-condensation properties and its preparation method. Background Technology

[0002] In the field of interior wall decoration, especially in environments with large temperature differences and high humidity (such as basements, bathrooms, kitchens, and seasonally humid areas), condensation (condensation) is prone to occur on wall surfaces. The long-term presence of condensation can not only damage the wall decoration layer, leading to mold, peeling, and flaking of the coating, but also breed bacteria, affecting the hygiene and health of the living environment.

[0003] Traditional interior wall coatings primarily delay water droplet adhesion by increasing the hydrophobicity of the coating film, but this cannot fundamentally solve the temperature difference between the wall surface temperature and the indoor air dew point temperature, nor can it effectively absorb or drain existing condensation. Furthermore, while some functional coatings add heat-insulating fillers, this often sacrifices the mechanical properties and workability of the coating film.

[0004] Therefore, developing a coating that can effectively suppress or mitigate the problem of condensation on interior walls while maintaining good workability and coating quality has significant market value and social significance. Summary of the Invention

[0005] The present invention aims to provide an anti-condensation coating for interior walls and its preparation method, so as to solve the technical problems of poor anti-condensation performance and easy damage to the coating film of existing coatings.

[0006] To achieve the above objectives, the present invention adopts one of the following technical solutions:

[0007] An interior wall anti-condensation coating, characterized in that it is composed of component A and component B mixed in a volume ratio of 5:1; Component A is composed of the following raw materials in parts by weight: Water-resistant anti-condensation coating for interior walls and its preparation method (30-50 parts) Defoamer for interior wall anti-condensation coating and its preparation method (0.5-1 parts) Anti-corrosion interior wall coating and its preparation method (0.5-1 part). 2-4 parts of ethylene glycol interior wall anti-condensation coating and its preparation method Dodecyl alcohol ester interior wall anti-condensation coating and its preparation method (3-5 parts) Sodium polycarboxylate dispersant for interior wall anti-condensation coating and its preparation method (3-5 parts) Magnesium aluminum silicate thixotropic agent interior wall anti-condensation coating and its preparation method (0.2-0.5 parts) Hydroxyethyl cellulose interior wall anti-condensation coating and its preparation method (0.5-1 parts) Titanium dioxide anti-condensation coating for interior walls and its preparation method (3-5 parts) Talc-based anti-condensation interior wall coating and its preparation method (3-5 parts) 3-5 parts of heavy calcium carbonate interior wall anti-condensation coating and its preparation method pH adjuster for interior wall anti-condensation coating and its preparation method (0.2-0.4 parts) Acrylic emulsion anti-condensation interior wall coating and its preparation method (30-40 parts) Polyurethane thickener for interior wall anti-condensation coating and its preparation method (0.3-0.6 parts); Component B consists of vitrified microspheres with a fineness such that they pass through a 0.3 mm sieve.

[0008] Furthermore, the defoamer is a mineral oil-based defoamer or an organosilicone defoamer; the preservative is an isothiazolinone preservative; and the pH adjuster is ammonia or an organic amine adjuster.

[0009] The present invention also provides a method for preparing the aforementioned anti-condensation coating for interior walls, comprising the following steps: Step 1: Preparation of Component A Turn on the disc disperser and add water, defoamer, preservative, ethylene glycol, dodecyl alcohol ester, sodium polycarboxylate dispersant, magnesium aluminum silicate thixotropic agent, hydroxyethyl cellulose, titanium dioxide, talc, and heavy calcium carbonate in sequence while stirring. After adding the materials, continue stirring for 3 minutes. Then add the pH adjuster and stir for 5 minutes; Add the acrylic emulsion and stir for 2 minutes; Finally, add the polyurethane thickener and stir for 2 minutes to obtain a uniform slurry of component A. Step 2: Mixing the finished coating Mix component A and component B obtained in step 1 at a volume ratio of 5:1 and stir until homogeneous to obtain the interior wall anti-condensation coating.

[0010] This invention forms a continuous coating film with good flexibility and breathability through the synergistic effect of acrylic emulsion and functional additives in component A; component B, vitrified microspheres, is a porous and lightweight material that is uniformly distributed in the coating film and can: (1) reduce the thermal conductivity of the coating film, reduce the heat exchange between the wall surface and the indoor air, increase the wall surface temperature, and delay or prevent condensation; (2) provide micro-capillary channels that can absorb and channel a small amount of condensate and accelerate the evaporation of moisture; (3) increase the roughness of the coating film and improve the adhesion to the putty layer.

[0011] Compared with the prior art, the present invention has the following significant advantages: Through the dual mechanisms of heat insulation and moisture absorption of vitrified microspheres, the tendency of condensation on the wall surface is significantly reduced.

[0012] It has strong adhesion, good water resistance, and excellent breathability, and is not prone to peeling or flaking.

[0013] The coating of this invention is a water-based system with low VOC. Components A and B are mixed on-site, making it simple to operate and highly adaptable. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with specific examples. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0015] Examples 1-3 The product brands in this embodiment are: defoamer (Synopco NXZ), preservative (Kasson RX-20B), ethylene glycol (Shell), dodecyl alcohol ester (Eastman C12), sodium polycarboxylate dispersant (5040 dispersant), magnesium aluminum silicate thixotropic agent (PT-XL68), hydroxyethyl cellulose (HBR250), titanium dioxide (rutile type), talc (1250 mesh), and heavy calcium carbonate (800 mesh).

[0016] The preparation method of the interior wall anti-condensation coating in this embodiment includes the following steps: Step 1, Preparation of Component A: Turn on the disc disperser and add water, defoamer, preservative, ethylene glycol, dodecyl alcohol ester, sodium polycarboxylate dispersant, magnesium aluminum silicate thixotropic agent, hydroxyethyl cellulose, titanium dioxide, talc, and heavy calcium carbonate in sequence while stirring. After adding the materials, continue stirring for 3 minutes. Then add the pH adjuster and stir for 5 minutes; Add the acrylic emulsion and stir for 2 minutes; Finally, add the polyurethane thickener and stir for 2 minutes to obtain a uniform slurry of component A. Step 2, mixing of finished coatings: Mix component A and component B obtained in step 1 at a volume ratio of 5:1 and stir until homogeneous to obtain the interior wall anti-condensation coating.

[0017] Based on the weight proportions of each component listed in Table 1, the coatings of Examples 1-3 were prepared according to the preparation method described above. The volume ratio of component A to component B was fixed at 5:1.

[0018] Table 1. Formulation composition (parts by weight) of Examples 1-3 and Comparative Examples 1-2

[0019] In Comparative Example 1, component B (vitrified microspheres) was not added; only component A was used as the coating. In Comparative Example 2, component B was replaced with an equal volume of ordinary expanded perlite (fineness same as passing through a 0.3 mm sieve), otherwise, it was the same as in Example 1. The coatings prepared in Examples 1-3 and Comparative Examples 1-2 were tested for performance according to JG / T210-2018 "Primers for Interior and Exterior Walls" and a self-developed anti-condensation test method. Specifically, the anti-condensation performance test (self-developed method) involved applying the coating to a cement fiberboard (300mm×300mm×5mm) with a dry film thickness of approximately 1.0 mm and curing for 7 days. The test board was placed in a constant temperature and humidity chamber, with the back simulating the winter wall temperature (5℃) and the front exposed to an environment with an air temperature of 20℃ and a relative humidity of 80%. The presence of condensation on the front surface was observed, and the condensation time was recorded. The thermal conductivity was tested according to GB / T10294-2008 to evaluate the coating's thermal insulation ability. The conventional properties of the coating include adhesion (cross-cut test, GB / T9286-1998) and water resistance (96h, GB / T1733-1993).

[0020] Table 2 Performance Test Results

[0021] The products prepared in Examples 1-3 and Comparative Examples 1-2 were tested for anti-condensation performance, thermal insulation performance, and conventional coating performance. The results showed that no condensation occurred in Examples 1-3 within 4 hours of testing, while Comparative Example 1 showed complete condensation after 45 minutes, and Comparative Example 2 showed localized condensation after 112 minutes, with the condensation area reaching 35% after 4 hours. This indicates that the vitrified microspheres added in this invention can significantly improve the anti-condensation ability of the coating, and the effect is better than that of ordinary expanded perlite.

[0022] The thermal conductivity of Examples 1-3 is all below 0.09 W / (m·K), which is much lower than that of Comparative Example 1 (0.230) and Comparative Example 2 (0.145), proving that the vitrified microspheres endow the coating with good thermal insulation effect, thereby increasing the surface temperature of the wall and inhibiting condensation.

[0023] The adhesion of Examples 1-3 was all Grade 1, and the water resistance was normal, indicating that the formulation of the present invention takes into account both mechanical properties and water resistance. Comparative Example 1 had poor film density and poor water resistance due to the lack of heat-insulating filler; Comparative Example 2 had decreased adhesion and poor water resistance due to the high water absorption rate and low strength of expanded perlite.

[0024] In summary, the anti-condensation coating for interior walls provided by this invention, through the compounding of components A and B with specific composition and volume ratio, and especially by using vitrified microspheres as functional fillers, not only achieves excellent anti-condensation performance but also maintains good overall coating quality, demonstrating outstanding substantive features and significant progress.

[0025] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An interior wall anti-condensation coating, characterized in that, It is composed of component A and component B mixed in a volume ratio of 5:1; Component A is composed of the following raw materials in parts by weight: 30-50 parts water Defoamer 0.5-1 part, Preservative 0.5-1 part, 2-4 parts ethylene glycol 3-5 parts of dodecyl alcohol ester, 3-5 parts of sodium polycarboxylate dispersant Magnesium aluminum silicate thixotropic agent 0.2-0.5 parts, Hydroxyethyl cellulose 0.5-1 part, 3-5 parts titanium dioxide 3-5 parts talcum powder 3-5 portions of tricalcium, pH adjuster 0.2-0.4 parts, 30-40 parts acrylic emulsion 0.3-0.6 parts of polyurethane thickener; Component B consists of vitrified microspheres with a fineness such that they pass through a 0.3 mm sieve.

2. The interior wall anti-condensation coating according to claim 1, characterized in that, The defoamer is a mineral oil-based defoamer or an organosilicon defoamer.

3. The interior wall anti-condensation coating according to claim 1, characterized in that, The preservative is an isothiazolinone preservative.

4. The interior wall anti-condensation coating according to claim 1, characterized in that, The pH adjuster is ammonia or an organic amine.

5. A method for preparing an interior wall anti-condensation coating according to any one of claims 1-4, characterized in that, Includes the following steps: Step 1, Preparation of Component A: Turn on the disc disperser and add water, defoamer, preservative, ethylene glycol, dodecyl alcohol ester, sodium polycarboxylate dispersant, magnesium aluminum silicate thixotropic agent, hydroxyethyl cellulose, titanium dioxide, talc, and heavy calcium carbonate in sequence while stirring. After adding the materials, stir for 3 minutes. Then add the pH adjuster and stir for 5 minutes; Add the acrylic emulsion and stir for 2 minutes; Finally, add the polyurethane thickener and stir for 2 minutes to obtain component A. Step 2, mixing of finished coatings: Mix component A and component B obtained in step 1 at a volume ratio of 5:1 and stir until homogeneous to obtain the interior wall anti-condensation coating.

6. The preparation method according to claim 5, characterized in that, The stirring speed is 800-1200 rpm.

7. The preparation method according to claim 5, characterized in that, The mixing in step 2 is done manually or mechanically for 2-5 minutes.

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