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CN-122011851-A - Preparation method of waterproof aerogel coating

CN122011851ACN 122011851 ACN122011851 ACN 122011851ACN-122011851-A

Abstract

The invention discloses a preparation method of a waterproof aerogel coating, which relates to the technical field of aerogel coatings, and aims to unify contradictory characteristics of high adhesion and nondestructive removal by constructing a PVA/basalt fiber three-dimensional network as a strippable skeleton and guiding stripping stress to dissipate in a coating, realize integral stripping by adjusting the proportion of emulsion to aerogel while maintaining excellent waterproof and heat-insulating properties, realize long-term protection in extreme outdoor environments by adopting a fluorosilicone system and a weather-resistant auxiliary agent through a dual-reinforcement design of a strong interface and a strong skeleton, and provide a solution for periodic maintenance of high-value equipment, historical buildings and outdoor facilities by adopting a fluorine-silicon system and weather-resistant auxiliary agent.

Inventors

  • TENG KAIMING
  • JING FENG
  • SHEN PENG
  • WANG WANYONG
  • LI NAIXIN
  • ZHANG DONGSHENG

Assignees

  • 珈云新材料(徐州)有限公司
  • 江苏珈云新材料有限公司

Dates

Publication Date
20260512
Application Date
20260114

Claims (9)

  1. 1. The preparation method of the waterproof aerogel coating is characterized by comprising the following steps of: s1, premixing and plasticizing the emulsion, namely adding the silicon modified acrylic emulsion and the elastic acrylic ester copolymer emulsion into a reaction container at the temperature of 20-30 ℃ and the relative humidity of less than or equal to 60 percent, and stirring and mixing at the rotating speed of 100-130 rpm for 3-5 min; S2, pre-dispersing the auxiliary agent, namely maintaining stirring, sequentially adding a wetting dispersant, a film-forming auxiliary agent, a plasticizer, a defoaming agent and deionized water, and then raising the stirring rotation speed to 240-260 rpm and dispersing at a high speed of 12-20 min; S3, powder premixing and gradient feeding, namely pre-mixing hydrophobic silica aerogel powder and an intumescent flame retardant for 5-10 min, sieving with a 80-120 mesh sieve, and adding the mixed powder into the system of the step S2 in 3-5 batches under a stirring state, wherein the total feeding time is 15-25 min; S4, high-speed shearing homogenization, namely switching stirring paddles, carrying out multistage stepped shearing on the system in the step S3, controlling the temperature of the material to be less than or equal to 38 ℃ until the fineness of the slurry is less than or equal to 80 mu m, and filtering to obtain a base material; s5, constructing a fiber network, namely adjusting the stirring rotation speed to 150-190 rpm, sequentially adding the chopped basalt fibers and the chopped polyvinyl alcohol fibers, and stirring for 18-30 min to enable the fibers to be fully dispersed and form a three-dimensional network structure with the system; S6, adding reactive tackifying resin and rheological auxiliary agent in sequence under stirring, supplementing defoamer, adjusting the total mass of the system by deionized water, defoaming 8-12 min under vacuum degree of-0.085 to-0.095 MPa, and finally standing and curing 90 min-24 h under 20-30 ℃ to obtain the waterproof aerogel coating.
  2. 2. The method for preparing a waterproof aerogel coating according to claim 1, wherein in the step S1, the silicon modified acrylic emulsion is used in an amount of 23 to 33 parts by mass and the elastic acrylate copolymer emulsion is used in an amount of 6 to 8 parts by mass.
  3. 3. The preparation method of the waterproof aerogel coating according to claim 1, wherein in the step S3, the hydrophobic silica aerogel powder is used in an amount of 35-45 parts by mass, and the intumescent flame retardant consists of ammonium polyphosphate, pentaerythritol and melamine in a mass ratio of 10 (2-4) to 2-4.
  4. 4. The method of claim 1, wherein in step S4, the multi-stage step shearing comprises dispersing 4-6 min in 480-520 rpm, dispersing 8-12 min in 780-820 rpm, and dispersing 5-8 min in 1180-1220 rpm.
  5. 5. The method for preparing a waterproof aerogel coating according to claim 1, wherein in the step S5, the length of the chopped basalt fiber is 3-6 mm, the amount is 0.3-0.8 parts by mass, the length of the chopped polyvinyl alcohol fiber is 6-10 mm, and the amount is 0.5-0.7 parts by mass.
  6. 6. The method for preparing a waterproof aerogel coating according to claim 1, wherein in the step S6, the reactive tackifying resin is used in an amount of 1.8 to 2.5 parts by mass and the rheological aid is used in an amount of 0.5 to 1.0 parts by mass.
  7. 7. The method for preparing a waterproof aerogel coating according to any one of claims 1 to 6, wherein in the step S1, the silicon modified acrylic emulsion is an adhesion promoting silicon modified acrylic emulsion, the elastic acrylate copolymer emulsion is a high tear resistant elastic emulsion, in the step S5, the length of the chopped basalt fiber is 6 mm, the amount is 0.8 part by mass, the length of the chopped polyvinyl alcohol fiber is 10mm, the amount is 0.7 part by mass, and the stirring time for constructing the fiber network is 35 to 45 min.
  8. 8. The method for preparing the waterproof aerogel coating according to any one of claims 1 to 6, wherein in the step S1, the film-forming base material is fluorosilicone modified acrylic emulsion, the dosage is 33 to 37 parts by mass, the step S2 further comprises the step of adding 0.3 to 0.7 part by mass of ultraviolet absorber and 0.2 to 0.4 part by mass of light stabilizer, the hydrophobic silica aerogel powder used in the step S3 is hydrophobic silica aerogel powder subjected to fluorosilane secondary treatment, and the chopped polyvinyl alcohol fibers used in the step S5 are hydrolysis-resistant polyvinyl alcohol fibers.
  9. 9. The method of any one of claims 1 to 6, wherein in step S6, the reactive tackifying resin is a reactive epoxy tackifying resin or a reactive polyurethane tackifying resin.

Description

Preparation method of waterproof aerogel coating Technical Field The invention relates to the technical field of aerogel coatings, in particular to a preparation method of a waterproof aerogel coating. Background Currently, there are numerous solutions in the art for applying aerogels to coatings. If acrylic emulsion is used as a base material, the coating obtains good heat insulation (the heat insulation temperature difference of the coating of 5mm reaches 113.5 ℃) and adhesive force by preparing aerogel dispersion liquid and adding a foaming agent. In addition, the nano TiO 2/SiO2 aerogel is used for modifying the polymer cement waterproof paint, the porous structure of the aerogel is used for adsorbing pollutants and providing places for photocatalysis, and meanwhile, the hydrophobicity of the coating is obviously improved, so that the contact angle of the coating can reach more than 160 degrees. These techniques are generally directed to solving single or composite performance problems of thermal insulation, water resistance, or corrosion resistance of the coating. However, for certain applications requiring periodic maintenance, refurbishment, or extremely high protection of substrates (e.g., high value equipment, historic building, precision instrument pods, etc.), conventional high performance protective coatings face a common challenge in that the coatings are typically designed to have extremely strong and durable adhesion to ensure their protective life. When the coating needs to be removed, the coating is difficult to completely peel off due to the over-strong adhesive force, the surface of the substrate is extremely easily damaged by forced removal, or the coating residue which is difficult to process is left. The prior art focuses on how to "enhance" the adhesion and durability of the coating, while there is little interest in imparting a "controllable," substrate-removing and non-damaging property to the coating. Therefore, how to provide a method for preparing a waterproof aerogel coating which is controllable and does not damage the characteristics of a substrate is a technical problem to be solved. Disclosure of Invention In view of the above, the present invention aims to provide a method for preparing a waterproof aerogel coating. Based on the above object, the present invention provides A preparation method of the waterproof aerogel coating comprises the following steps: s1, premixing and plasticizing the emulsion, namely adding the silicon modified acrylic emulsion and the elastic acrylic ester copolymer emulsion into a reaction container at the temperature of 20-30 ℃ and the relative humidity of less than or equal to 60 percent, and stirring and mixing at the rotating speed of 100-130 rpm for 3-5 min; S2, pre-dispersing the auxiliary agent, namely maintaining stirring, sequentially adding a wetting dispersant, a film-forming auxiliary agent, a plasticizer, a defoaming agent and deionized water, and then raising the stirring rotation speed to 240-260 rpm and dispersing at a high speed of 12-20 min; S3, powder premixing and gradient feeding, namely pre-mixing hydrophobic silica aerogel powder and an intumescent flame retardant for 5-10 min, sieving with a 80-120 mesh sieve, and adding the mixed powder into the system of the step S2 in 3-5 batches under a stirring state, wherein the total feeding time is 15-25 min; S4, high-speed shearing homogenization, namely switching stirring paddles, carrying out multistage stepped shearing on the system in the step S3, controlling the temperature of the material to be less than or equal to 38 ℃ until the fineness of the slurry is less than or equal to 80 mu m, and filtering to obtain a base material; s5, constructing a fiber network, namely adjusting the stirring rotation speed to 150-190 rpm, sequentially adding the chopped basalt fibers and the chopped polyvinyl alcohol fibers, and stirring for 18-30 min to enable the fibers to be fully dispersed and form a three-dimensional network structure with the system; S6, adding reactive tackifying resin and rheological auxiliary agent in sequence under stirring, supplementing defoamer, adjusting the total mass of the system by deionized water, defoaming 8-12 min under vacuum degree of-0.085 to-0.095 MPa, and finally standing and curing 90 min-24 h under 20-30 ℃ to obtain the waterproof aerogel coating. Further, the silicon modified acrylic emulsion is used in an amount of 23 to 33 parts by mass, and the elastic acrylic copolymer emulsion is used in an amount of 6 to 8 parts by mass. Further, the hydrophobic silica aerogel powder is used in an amount of 35-45 parts by mass, and the intumescent flame retardant consists of ammonium polyphosphate, pentaerythritol and melamine in a mass ratio of 10 (2-4) to 2-4. Further, the multi-stage step shear includes a first stage of dispersing 4-6 min at 480-520 rpm, a second stage of dispersing 8-12 min at 780-820 rpm, and a third stage of dispersing 5-8 min at 1180-12