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CN-122011924-A - Water-based porcelain-polymer coating material and preparation method and application thereof

CN122011924ACN 122011924 ACN122011924 ACN 122011924ACN-122011924-A

Abstract

The invention discloses a water-based ceramic coating material, a preparation method and application thereof, wherein the water-based ceramic coating material comprises a composite base material (40-45 parts of modified water-based polyurethane resin, 15-20 parts of water-based acrylic emulsion), a cooperative curing system (10-12 parts of closed isocyanate curing agent, 0.8-1.2 parts of latent organic zinc salt accelerator), an organic-inorganic reinforcing phase (10-15 parts of nano silicon dioxide and 8-10 parts of polysilazane) and a functional auxiliary agent. The base material and the cosolvent cooperate to enable VOCs to be less than or equal to 30g/L, the curing system cooperates to realize low-temperature rapid curing, and the organic-inorganic components cooperate to form a porcelain-gathering structure, so that the paint is suitable for the existing aluminum coil production line, and the environmental protection, energy conservation and performance bottlenecks of the traditional coating are solved.

Inventors

  • LIU GUOMIN
  • REN PEIXIAN

Assignees

  • 深圳市深赛尔股份有限公司

Dates

Publication Date
20260512
Application Date
20260224

Claims (10)

  1. 1. A preparation method of a water-based porcelain coating material is characterized by comprising the following steps of, by mass parts of raw materials of the water-based porcelain coating material, 40-45 Parts of modified aqueous polyurethane resin, 15-20 parts of aqueous acrylic emulsion, 10-15 parts of siliceous nano material, 8-10 parts of ceramic precursor polymer, 10-12 parts of closed isocyanate curing agent, 10-15 parts of deionized water, 3-5 parts of organic zinc salt accelerator, 2-2.5 parts of silane coupling agent, 1-2 parts of leveling agent, 1-2 parts of defoaming agent, 1-2 parts of cosolvent and 0.5-1 part of epoxy activator; the siliceous nano material is subjected to cosolvent dispersion and silane coupling agent coating treatment to obtain coupling agent coated nano particles, and the modified waterborne polyurethane resin is activated by an epoxy activator to obtain activated modified waterborne polyurethane resin; The coupling agent coated nano particles, the activated modified aqueous polyurethane resin and the rest components of the aqueous poly porcelain coating material raw materials are stirred at a gradient rotating speed to obtain a mixed system, wherein the organic zinc salt accelerator is added in batches; and regulating the pH value of the mixed system to be uniform and stable, and then adopting a gradient curing process to obtain the water-based ceramic coating material.
  2. 2. The method for preparing the water-based porcelain coating material according to claim 1, wherein the modified water-based polyurethane resin is obtained by copolymerizing polyhexamethylene adipate and isophorone diisocyanate and then introducing epoxy groups for modification, and the hydroxyl content is 3% -5%; the siliceous nano material is nano silicon dioxide; The ceramic precursor polymer comprises one or more of polysilazane, polysiloxane and titanium polysiloxane; the blocked isocyanate curing agent comprises one or two of caprolactam blocked toluene diisocyanate curing agent and caprolactam blocked isophorone diisocyanate curing agent; The organic zinc salt accelerator comprises zinc octoate, zinc iso-octoate or zinc acetylacetonate; The silane coupling agent comprises one of KH-550, KH-560 and A-1100; The leveling agent comprises polyether modified polysiloxane and an acrylic ester copolymer, the defoaming agent comprises organosilicon emulsion, polyether modified organosilicon and polyether polyol, the cosolvent comprises propylene glycol methyl ether and dipropylene glycol methyl ether, and the epoxy activator comprises 2-methylimidazole and triethanolamine.
  3. 3. The method for preparing the aqueous porcelain coating material of claim 1, wherein the method for processing the siliceous nanometer material through cosolvent dispersion and silane coupling agent coating treatment is characterized in that the siliceous nanometer material is added into the cosolvent, the silane coupling agent is added after ultrasonic dispersion, and the mixture is stirred at constant temperature to form coupling agent coated nanometer particles, so that the compatibility of the siliceous nanometer material and an organic base material is enhanced.
  4. 4. The method for preparing the aqueous porcelain coating material of claim 3, wherein the activation method of the modified aqueous polyurethane resin through the activation of the epoxy activator is that the epoxy activator is added into the modified aqueous polyurethane resin after the modified aqueous polyurethane resin is preheated to 40 ℃, and the reaction activity of hydroxyl and the curing agent is enhanced through stirring, so that the activated modified aqueous polyurethane resin is obtained.
  5. 5. The method for preparing the water-based ceramic coating material according to claim 1, wherein the water-based ceramic coating material is prepared by stirring at a gradient rotation speed to obtain a mixed system, Deionized water, coupling agent coated nano particles, ceramic precursor polymer, leveling agent and defoamer are stirred for 10-15 minutes at 500-600 r/min, and then stirred and mixed to form stable pre-dispersion liquid; Adding activated modified aqueous polyurethane resin and aqueous acrylic emulsion into the stable pre-dispersion liquid, lifting the rotating speed to 800-900 r/min, continuously stirring and mixing, heating the system to 45 ℃, dropwise adding a closed isocyanate curing agent under the high-speed shearing condition of 1500-160 r/min, simultaneously introducing nitrogen for protection, and dispersing to form uniform and stable curing agent emulsion; And cooling the system to 35 ℃, adding 50% of organic zinc salt accelerator, stirring at a low speed for 3-5 min, further cooling to 30 ℃, adding the rest of organic zinc salt accelerator, and continuously stirring for 10-15 min to obtain a mixed system.
  6. 6. The method for preparing the aqueous porcelain coating material according to claim 1, wherein the pH of the mixed system is regulated to be uniform and stable, the method comprises the steps of regulating the pH of the system to 7.0 by adopting an acid-base regulator, standing for 5min, and regulating the pH of the system to 7.5-8.5 by adopting the same reagent.
  7. 7. The method for preparing the water-based ceramic coating material according to claim 1, wherein the gradient curing process is characterized in that a system with uniform and stable pH value regulated by an acid-base regulator is cured for 10-12 hours at 30 ℃, then is heated to 35 ℃ for curing for 6-8 hours, and finally is cooled to 25 ℃ for curing for 3-4 hours.
  8. 8. A water-based porcelain coating material is characterized in that the water-based porcelain coating material is prepared by the preparation method of any one of claims 1-7.
  9. 9. The application of the water-based porcelain coating material according to claim 7, wherein the water-based porcelain coating material is coated on the surface of the pretreated aluminum coil by adopting a double-coating roller coating process; Wherein the thickness of the dry film of the first roller coating is controlled to be 8-10 mu m, through a baking oven with the temperature of 45-55℃ pre-curing for 10-15 s; and (3) rolling the dry film for the second time until the thickness of the total dry film is 15-20 mu m, curing for 30-40 s through an infrared and hot air composite oven, and accelerating a crosslinking reaction by utilizing infrared radiation to shorten the curing time, wherein the infrared wavelength is 2-5 mu m, and the temperature of hot air is 45-55 ℃.
  10. 10. The application of the water-based porcelain coating material as set forth in claim 9, wherein the pretreatment of the aluminum coil surface is that after the aluminum coil surface is subjected to sand blasting treatment, a layer of silane coupling agent diluent with the mass fraction of 5% is sprayed, and a transition bonding layer is formed after drying, so that the adhesive force of the coating is improved.

Description

Water-based porcelain-polymer coating material and preparation method and application thereof Technical Field The invention belongs to the technical field of water-based porcelain coating, and particularly relates to a water-based porcelain coating material, a preparation method and application thereof. Background The coating material is used as a key material for surface protection and functional modification, plays an important role in the field of industrial manufacturing, and is particularly widely applied to industries such as aluminum coiling, automobiles, electronics and the like. The aluminum coil industry is used as an important branch of metal processing, the product production depends on the curing and forming of a high-temperature paint coating, and the conventional process in the industry needs to keep the curing time of 45-60 seconds at the high temperature of 160-180 ℃ at present so as to meet the performance requirement of the coating. However, the traditional aluminum coil coating material and the traditional aluminum coil coating process have obvious pain points that on one hand, the existing high-temperature paint is mostly solvent-based, the emission amount of Volatile Organic Compounds (VOCs) is high and does not meet the current environmental protection requirement, and on the other hand, the high-temperature curing process consumes a large amount of energy, so that the production cost of enterprises is increased, and the energy conservation and consumption reduction trend under the global double-carbon target are contrary. In order to solve the problems, the water-based coating material becomes a research and development hot spot of the industry due to the advantage of environmental protection, but the existing water-based coating generally has the technical bottleneck of insufficient low-temperature curing performance, namely the curing temperature is difficult to be lower than 160 ℃, if the temperature is forcibly reduced, the problems of reduced coating adhesive force, insufficient hardness, poor corrosion resistance and the like are caused, and the actual construction and performance requirements of the aluminum coil industry cannot be met. Disclosure of Invention This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application. The present invention has been made in view of the above and/or problems occurring in the prior art. Therefore, the invention aims to overcome the defects in the prior art and provide a preparation method of an aqueous coating material which can realize rapid curing at a low temperature (such as 50 ℃) and has comprehensive performance reaching or exceeding that of the traditional high-temperature paint. In order to solve the technical problems, the invention provides the following technical scheme that the water-based porcelain coating material comprises the following raw materials in parts by weight, 40-45 Parts of modified aqueous polyurethane resin, 15-20 parts of aqueous acrylic emulsion, 10-15 parts of siliceous nano material, 8-10 parts of ceramic precursor polymer, 10-12 parts of closed isocyanate curing agent, 10-15 parts of deionized water, 3-5 parts of organic zinc salt accelerator, 2-2.5 parts of silane coupling agent, 1-2 parts of leveling agent, 1-2 parts of defoaming agent, 1-2 parts of cosolvent and 0.5-1 part of epoxy activator; the siliceous nano material is subjected to cosolvent dispersion and silane coupling agent coating treatment to obtain coupling agent coated nano particles, and the modified waterborne polyurethane resin is activated by an epoxy activator to obtain activated modified waterborne polyurethane resin; The coupling agent coated nano particles, the activated modified aqueous polyurethane resin and the rest components of the aqueous poly porcelain coating material raw materials are stirred at a gradient rotating speed to obtain a mixed system, wherein the organic zinc salt accelerator is added in batches; and regulating the pH value of the mixed system to be uniform and stable, and then adopting a gradient curing process to obtain the water-based ceramic coating material. As a preferable scheme of the preparation method of the water-based porcelain coating material, the modified water-based polyurethane resin is prepared by copolymerizing polyhexamethylene adipate and isophorone diisocyanate and then introducing epoxy groups for modification, wherein the hydroxyl content is 3% -5%; the siliceous nano material is nano silicon dioxide; The ceramic precursor polymer comprises one or more of polysilazane, polysiloxane and titanium polysiloxane; the blocked isocyanate curing agent comprises one or two of caprolactam blocked toluene diisocyanate curing ag