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CN-121975354-A - Barrier coating, preparation method thereof and composite film

CN121975354ACN 121975354 ACN121975354 ACN 121975354ACN-121975354-A

Abstract

The application relates to the technical field of packaging materials, and discloses a barrier coating, a preparation method thereof and a composite film. The aluminum-phosphorus compound comprises a first aluminum-phosphorus compound, a second aluminum-phosphorus compound and a third aluminum-phosphorus compound, wherein the first aluminum-phosphorus compound meets the requirements of [ Al (OH) 3‑n (OR) n ] w (PO x ) v , n is 0-3, x is 2-4, v: w is (0.2-3): 1, R comprises at least one of CH 3 、C 2 H 5 、C 3 H 7 、C 4 H 9 , the second aluminum-phosphorus compound meets the requirements of [ Al (OH) n ] w (PO x ) v , n is 0-3, x is 2-4, v: w is (0.2-3): 1, and the particle size of the first aluminum-phosphorus compound is larger than that of the second aluminum-phosphorus compound. The barrier coating can be used for preparing a barrier layer with compact structure and high barrier property.

Inventors

  • LIU YA
  • WANG QUN
  • XIE CHENYANG
  • FENG MINGZHU
  • HUANG SHANGHONG
  • LI WEI
  • ZHAO WEITAO

Assignees

  • 中国乐凯集团有限公司

Dates

Publication Date
20260505
Application Date
20260105

Claims (10)

  1. 1. A kind of barrier coating material, which is used for the heat-insulating material, characterized by comprising the following steps: the first aluminum-phosphorus compound meets the requirements of [ Al (OH) 3-n (OR) n ] w (PO x ) v , n is 0-3, x is 2-4, v:w is (0.2-3): 1, and R comprises at least one of CH 3 、C 2 H 5 、C 3 H 7 、C 4 H 9 ; The second aluminum phosphorus compound meets the requirements of [ Al (OH) n ] w (PO x ) v , n is 0-3, x is 2-4, and v:w is (0.2-3): 1; the particle size of the first aluminum phosphorus compound is larger than the particle size of the second aluminum phosphorus compound.
  2. 2. The barrier coating of claim 1, wherein, The particle size of the first aluminum phosphorus compound is 1-5 mu m, and/or, The particle size of the second aluminum phosphorus compound is 10 nm-500 nm.
  3. 3. The barrier coating of claim 1, wherein, The mole ratio of the phosphorus element to the aluminum element in the barrier coating is (0.2-3.0): 1, and/or, The mass ratio of the first aluminum-phosphorus compound to the second aluminum-phosphorus compound is (0.2-5) 1.
  4. 4. The barrier coating of any one of claims 1-3, wherein at least one of: The barrier coating comprises a first component, wherein the first component comprises the first aluminum-phosphorus compound and a solvent, and optionally, the pH value of the first component is 1-5, and/or the solid content of the first component is 1% -20%; The barrier coating comprises a second component, wherein the second component comprises the second aluminum phosphorus compound and a solvent, optionally, the pH value of the second component is 1-5, and/or the solid content of the second component is 1% -20%.
  5. 5. The barrier coating of any one of claims 1-3, further comprising: an organic polymer comprising at least one of polyvinyl alcohol, polyacrylic acid, polymethacrylic acid, ethylene-acrylic acid copolymer, ethylene-maleic anhydride copolymer.
  6. 6. A method of preparing the barrier coating of any one of claims 1-5, comprising: carrying out hydrolysis treatment on the first aluminum-containing compound to obtain an aluminum-containing hydrolysis solution, wherein the pH value of the aluminum-containing hydrolysis solution is 1.0-5.0; Carrying out first mixing treatment on the aluminum-containing hydrolysis solution and a phosphorus-containing compound to obtain a first aluminum-phosphorus compound; carrying out second mixing treatment on the second aluminum-containing compound and the phosphorus-containing compound to obtain a second aluminum-phosphorus compound; and carrying out third mixing treatment on the first aluminum phosphorus compound and the second aluminum phosphorus compound to obtain the barrier coating.
  7. 7. The method of claim 6, wherein at least one of the following conditions is satisfied: The first aluminum-containing compound comprises at least one of trimethoxy aluminum, triethoxy aluminum, tri-n-propoxy aluminum, triisopropoxy aluminum, tri-n-butoxy aluminum, tri-sec-butoxy aluminum, tri-tert-butoxy aluminum, aluminum chloride, aluminum nitrate, and aluminum lactate; The phosphorus-containing compound comprises at least one of phosphoric acid, polyphosphoric acid, phosphonic acid, phosphinic acid, ammonium phosphate, triethyl phosphate, hydroxyethylidene diphosphonic acid and aminotrimethylene phosphonic acid; The second aluminum-containing compound includes aluminum hydroxychloride.
  8. 8. The method of claim 6, wherein at least one of the following conditions is satisfied: the temperature of the hydrolysis treatment is 60-95 ℃; in the first mixing treatment, the molar ratio of the phosphorus element in the phosphorus-containing compound to the aluminum element in the aluminum-containing hydrolysis solution is (0.2-3) 1; in the second mixing treatment, the molar ratio of the phosphorus element of the phosphorus-containing compound to the aluminum element of the second aluminum-containing compound is (0.2-3): 1.
  9. 9. A composite membrane, comprising: A substrate; A barrier layer disposed on at least one side surface of the substrate, the barrier layer comprising the barrier coating of any one of claims 1-5, or the barrier coating prepared by the method of any one of claims 6-8.
  10. 10. The composite membrane of claim 9 wherein the polymer film is, The thickness of the substrate is 5-150 μm, and/or, The thickness of the barrier layer is 0.1-1 mu m.

Description

Barrier coating, preparation method thereof and composite film Technical Field The application relates to the technical field of packaging materials, in particular to a barrier coating, a preparation method thereof and a composite film. Background Food and pharmaceuticals are susceptible to deterioration during storage due to oxygen, moisture and microorganisms, and are required to be packaged with packaging materials having sufficient barrier properties. After the barrier layer is formed by preparing inorganic oxides such as alumina or silicon oxide and the like by a physical deposition or chemical deposition method, the barrier performance of the film packaging material can be obviously improved. Packaging materials comprising such barrier layers have significant drawbacks. The components in the barrier layer belong to rigid inorganic materials, and the barrier layer and the organic base material in the packaging material have the defects of large mechanical property difference, poor interface compatibility and the like, so that the packaging material has brittle fracture or interface layering phenomenon of the barrier layer in the use process. It should be noted that the foregoing statements are merely to provide background information related to the present disclosure and may not necessarily constitute prior art. Disclosure of Invention In a first aspect of the application, the application provides a barrier coating comprising a first aluminum-phosphorus compound, wherein the first aluminum-phosphorus compound satisfies [ Al (OH) 3-n(OR)n]w(POx)v, n is 0-3, x is 2-4, v: w is (0.2-3): 1, R comprises at least one of CH 3、C2H5、C3H7、C4H9, and a second aluminum-phosphorus compound satisfies [ Al (OH) n]w(POx)v, n is 0-3, x is 2-4, and v: w is (0.2-3): 1, wherein the particle size of the first aluminum-phosphorus compound is larger than that of the second aluminum-phosphorus compound. In some embodiments, the first aluminum phosphorus compound has a particle size of 1 μm to 5 μm and/or the second aluminum phosphorus compound has a particle size of 10nm to 500nm. In some embodiments, the mole ratio of phosphorus element to aluminum element in the barrier coating is (0.2-3.0): 1, and/or the mass ratio of the first aluminum phosphorus compound to the second aluminum phosphorus compound is (0.2-5): 1. In some embodiments, at least one of the barrier coating comprising a first component comprising the first aluminum phosphorus compound, a solvent, optionally the first component having a pH of 1-5, and/or the first component having a solids content of 1% -20%, the barrier coating comprising a second component comprising the second aluminum phosphorus compound, a solvent, optionally the second component having a pH of 1-5, and/or the second component having a solids content of 1% -20% is satisfied. In some embodiments, an organic polymer is also included, the organic polymer including at least one of polyvinyl alcohol, polyacrylic acid, polymethacrylic acid, ethylene-acrylic acid copolymer, ethylene-maleic anhydride copolymer. In a second aspect of the application, the application provides a method for preparing the barrier coating, which comprises the steps of carrying out hydrolysis treatment on a first aluminum-containing compound to obtain an aluminum-containing hydrolysis solution, carrying out first mixing treatment on the aluminum-containing hydrolysis solution and a phosphorus-containing compound to obtain a first aluminum-phosphorus compound, carrying out second mixing treatment on a second aluminum-containing compound and a phosphorus-containing compound to obtain a second aluminum-phosphorus compound, and carrying out third mixing treatment on the first aluminum-phosphorus compound and the second aluminum-phosphorus compound to obtain the barrier coating. In some embodiments, at least one of the following conditions is satisfied for the first aluminum-containing compound to include at least one of trimethoxy aluminum, triethoxy aluminum, tri-n-propoxy aluminum, triisopropoxy aluminum, tri-n-butoxy aluminum, tri-sec-butoxy aluminum, tri-tert-butoxy aluminum, aluminum chloride, aluminum nitrate, aluminum lactate, the phosphorus-containing compound to include at least one of phosphoric acid, polyphosphoric acid, phosphonic acid, phosphinic acid, ammonium phosphate, triethyl phosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, and the second aluminum-containing compound to include aluminum hydroxychloride. In some embodiments, at least one of the conditions of the hydrolysis treatment temperature of 60 ℃ to 95 ℃, the molar ratio of the phosphorus element in the phosphorus-containing compound to the aluminum element of the aluminum-containing hydrolysis solution of (0.2 to 3.0): 1 in the first mixing treatment, and the molar ratio of the phosphorus element in the phosphorus-containing compound to the aluminum element of the second aluminum-containing compound of (0.2 to 3.0): 1 in