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CN-122011860-A - Acrylic waterproof coating suitable for condensation environment construction and preparation method thereof

CN122011860ACN 122011860 ACN122011860 ACN 122011860ACN-122011860-A

Abstract

The invention discloses an acrylic waterproof coating suitable for condensation environment construction and a preparation method thereof. The raw materials of the acrylic waterproof coating comprise 30-60 parts of aqueous acrylic emulsion, 1-6 parts of fumed silica, 5-10 parts of polyvinyl alcohol aqueous solution with the mass percentage concentration of 5-10%, 1-5 parts of antifreeze composition, 3-5 parts of cosolvent, 1-3 parts of dispersing agent, 0.1-0.5 part of defoamer, 10-15 parts of pigment, 5-10 parts of filler, 0.1-0.5 part of thickener, 0.1-0.4 part of wetting agent and 8-20 parts of water, wherein the antifreeze composition comprises component A and component B, the mass ratio of the component A to the component B is 1:0.5-1.5, wherein the component A is one or two of betaine and choline chloride, and the component B is one or two of ethylene glycol and propylene glycol.

Inventors

  • YAN WENJIE
  • LIU ZHIGANG
  • FU TAO
  • ZHANG JIE
  • Geng Zhiquan
  • PENG SHANQING
  • YUAN LEI
  • YI ZHONGYU
  • SHI ZHENPING
  • YANG TINGTING
  • DU JIANGUANG
  • XU CE
  • LUO YONGLE
  • DUAN YUNFENG
  • La Jingwei
  • LI XINRAN
  • LI WEICHAO
  • YU YANG
  • WANG JIAN
  • YANG LI
  • ZHANG YUNYING
  • JI YONGCHAO
  • LI CHAO
  • ZHENG DONGBIN
  • WANG YUQI

Assignees

  • 中国铁路北京局集团有限公司北京房建公寓段

Dates

Publication Date
20260512
Application Date
20260324

Claims (10)

  1. 1. The acrylic waterproof coating suitable for construction in condensation environment comprises the following raw materials in parts by mass: 30-60 parts of aqueous acrylic emulsion, 1-6 parts of fumed silica, 5-10 parts of polyvinyl alcohol aqueous solution with the mass percent concentration of 5-10%, 1-5 parts of antifreeze composition, 3-5 parts of cosolvent, 1-3 parts of dispersing agent, 0.1-0.5 part of defoamer, 10-15 parts of pigment, 5-10 parts of filler, 0.1-0.5 part of thickener, 0.1-0.4 part of wetting agent and 8-20 parts of water; The antifreezing agent composition comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1:0.5-1.5, the component A is one or two of betaine and choline chloride in any proportion, and the component B is one or two of ethylene glycol and propylene glycol in any proportion.
  2. 2. The acrylic waterproof coating material according to claim 1, wherein the acrylic waterproof coating material comprises the following raw materials in parts by mass: 40-55 parts of aqueous acrylic emulsion, 2-4 parts of fumed silica, 8-10 parts of polyvinyl alcohol aqueous solution with the mass percentage concentration of 5-10%, 3-5 parts of antifreeze composition, 3-4 parts of cosolvent, 2-3 parts of dispersing agent, 0.2-0.3 part of defoamer, 10-12 parts of pigment, 7-9 parts of filler, 0.2-0.3 part of wetting agent, 0.2-0.5 part of thickener and 12-20 parts of water.
  3. 3. The acrylic waterproof paint according to claim 1 or 2, wherein the aqueous acrylic emulsion has a polymer molecular weight of 5000-40000, and is at least one selected from the group consisting of a polyacrylic emulsion, a copolymerized acrylic emulsion, a polyurethane modified acrylic emulsion, and a silicone modified acrylic emulsion; More preferably, the aqueous acrylic emulsion is a urethane acrylic emulsion having a molecular weight of 15000 to 30000.
  4. 4. The acrylic waterproof paint according to claim 1 or 2, wherein the specific surface area of the fumed silica is 150-300m 2 /g, and the particle size is less than or equal to 600 μm; preferably, the specific surface area of the fumed silica is 150-250m 2 /g, and the particle size is less than or equal to 300 mu m.
  5. 5. The acrylic waterproof paint according to claim 1 or 2, wherein the polyvinyl alcohol aqueous solution has a mass percentage concentration of 8% -10%; Preferably, the polyvinyl alcohol aqueous solution is prepared by dispersing one or more of 1788, 1799, 2480 and 2488 with a polymerization degree of 1500-3000 in water; More preferably, the aqueous polyvinyl alcohol solution is prepared by dispersing one or two of 2480 and 2488 of the polymerization degree 2400 in water in any proportion; most preferably, the aqueous solution of polyvinyl alcohol is prepared by dispersing 2480 polyvinyl alcohol with a polymerization degree of 2400 in hot water and stirring.
  6. 6. The acrylic waterproof paint according to claim 1 or 2, wherein the cosolvent is selected from one or two of dipropylene glycol butyl ether and dipropylene glycol methyl ether in any proportion; preferably, the dispersant is selected from anionic, cationic or nonionic dispersants; more preferably, the dispersant is SN-1792 manufactured by Pick chemical company, germany; still preferably, the defoamer is selected from one or more of mineral oil defoamer, silicone defoamer, polyether defoamer and alkynol defoamer in any proportion; more preferably, the defoamer is a polyether defoamer; Preferably, the wetting agent is selected from one or more of an organosilicon-based substrate wetting agent, an anionic-based substrate wetting agent, and a nonionic-based substrate wetting agent in any proportion; More preferably, the wetting agent is a silicone-based substrate wetting agent; Also preferably, the thickener is selected from one or more of an acrylic associative thickener, an alkali swellable thickener and a cellulose ether thickener in any proportion; Preferably, the thickener is an acrylic associative thickener.
  7. 7. The acrylic waterproof paint according to claim 1 or 2, wherein the pigment is selected from one or more of rutile titanium pigment, anatase titanium pigment, phthalocyanine pigment, iron oxide pigment and organic carbon black in any proportion; Preferably, the filler is selected from one or more of precipitated barium sulfate, mica powder, calcium carbonate and talcum powder in any proportion.
  8. 8. The method for preparing the acrylic waterproof paint suitable for construction in condensation environment according to any one of claims 1 to 7, comprising the following steps: I. preparing raw materials according to the parts by mass; Adding the water in the mass part into a paint grinder with a stirring device, adding the fumed silica in the mass part under stirring, sequentially adding the dispersing agent, the defoaming agent, the pigment and the filler in the mass part after uniform dispersion, adding zirconia beads after uniform mixing, grinding to the fineness of 10-20 mu m at 20-50 ℃, filtering, and removing the zirconia beads to obtain slurry; And III, adding the acrylic emulsion with the mass parts into mixing equipment with a stirring device, adding the slurry obtained in the step II, adding the polyvinyl alcohol solution with the mass parts, stirring uniformly, and sequentially adding the antifreezing agent composition, the cosolvent, the wetting agent and the thickening agent with the mass parts, and stirring uniformly to obtain the anti-freezing agent.
  9. 9. The method according to claim 8, wherein in the step II, the fumed silica is uniformly dispersed in water by stirring at a stirring speed of 600 to 1000r/min for 3 to 10 min; preferably, in the step III, the stirring speed is 500-800r/min.
  10. 10. The construction process of the acrylic waterproof coating material suitable for condensation environment construction according to any one of claims 1 to 7 or the acrylic waterproof coating material suitable for condensation environment construction directly obtained by the preparation method according to claim 8 or 9 comprises cleaning the surface of a metal substrate to be coated, spraying, rolling or brushing the acrylic waterproof coating material on the surface of the metal substrate for 2-3 times until the dry film thickness reaches 0.5-2.0mm, and naturally drying.

Description

Acrylic waterproof coating suitable for condensation environment construction and preparation method thereof Technical Field The invention belongs to the technical field of high polymer coating, and in particular relates to an acrylic acid waterproof coating capable of being constructed and maintained in a low-temperature high-humidity condensation environment and a preparation method thereof. Background Condensation is a common physical phenomenon, which means that when the surface temperature of an object is lower than the dew point temperature of surrounding air, water vapor in the air is condensed into a layer of liquid water film visible or invisible to naked eyes on the surface of the object. Condensation is particularly common in high humidity environments or in areas with severe temperature differences, such as underground piping lanes, building roofs, and areas with large day-to-night temperature differences. The aqueous acrylic coating requires that a continuous coating film be formed on the surface of the substrate after the evaporation of water. If there is condensation (water film) on the basal plane at this moment, perhaps the in-process humidity is close saturation (the temperature is close to the dew point) in the construction, on the one hand the coating glues on one deck water film, leads to foaming, drops, and on the other hand volatilized moisture can't in time discharge, leads to film structure loosening or appear the microdefect. Thus, the basic commercial acrylic coatings clearly define the conditions under which the substrate temperature must be 3 ℃ above the dew point, as well as the maximum relative humidity of the environment. Aiming at the construction difficulty in the condensation environment, the prior art mainly focuses on passive adaptation by an environmental intervention means. For example, in the field of electrical or electrical equipment, common anti-condensation strategies are to increase the ambient temperature by installing a heater to pull the temperature difference from the dew point, or to reduce absolute humidity by sealing, dehumidification equipment. These methods have the limitations of high energy consumption, complex equipment, and inability to be implemented on open or large area substrate surfaces. The underlying solution to this problem may be in the modification of acrylic coatings. In the prior art, the performance improvement of the acrylic coating is mainly focused on the aspects of improving weather resistance, elasticity and the like, such as the acrylic waterproof coating disclosed in CN120737679A, CN114381178A, and how to adapt to the construction and maintenance environment of condensation is rarely discussed. Disclosure of Invention Aiming at the defects of the prior art, the invention provides an acrylic waterproof coating suitable for construction in condensation environment and a preparation method thereof. The acrylic waterproof coating disclosed by the invention has strong adhesion with a substrate, can be directly constructed and maintained in a low-temperature high-humidity condensation environment, and does not need to additionally add equipment or measures to interfere with the environment. Therefore, the acrylic waterproof coating disclosed by the invention is wide in spraying construction temperature range, and is especially suitable for the outer surface waterproof construction of large-scale buildings and equipment in an open condensation environment. Therefore, in the first aspect, the invention provides an acrylic waterproof coating suitable for construction in a condensation environment, which comprises the following raw materials in parts by mass: 30-60 parts of aqueous acrylic emulsion, 1-6 parts of fumed silica, 5-10 parts of polyvinyl alcohol aqueous solution with the mass percent concentration of 5-10%, 1-5 parts of antifreeze composition, 3-5 parts of cosolvent, 1-3 parts of dispersing agent, 0.1-0.5 part of defoamer, 10-15 parts of pigment, 5-10 parts of filler, 0.1-0.5 part of thickener, 0.1-0.4 part of wetting agent and 8-20 parts of water; The antifreezing agent composition comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1:0.5-1.5, the component A is one or two of betaine and choline chloride in any proportion, and the component B is one or two of ethylene glycol and propylene glycol in any proportion. As a preferred embodiment, the acrylic waterproof coating suitable for condensation environment construction provided by the invention comprises the following raw materials in parts by mass: 40-55 parts of aqueous acrylic emulsion, 2-4 parts of fumed silica, 8-10 parts of polyvinyl alcohol aqueous solution with the mass percentage concentration of 5-10%, 3-5 parts of antifreeze composition, 3-4 parts of cosolvent, 2-3 parts of dispersing agent, 0.2-0.3 part of defoamer, 10-12 parts of pigment, 7-9 parts of filler, 0.2-0.3 part of wetting agent, 0.2-0.5 part of thi