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CN-121975445-A - Protective film, preparation method thereof and refrigerator

CN121975445ACN 121975445 ACN121975445 ACN 121975445ACN-121975445-A

Abstract

The invention discloses a protective film, a preparation method thereof and a refrigerator, and belongs to the field of protective films. The invention provides a protective film for protecting the surface of a metal part, which comprises a matrix, a filler and an adhesive, wherein the filler comprises diatomite and chitosan, and the adhesive comprises a metal organic frame. The invention is applied to the aspect of household appliance protection, solves the problems that the special-shaped metal part protective film is difficult to adhere and easy to generate bubbles, and has the characteristics of excellent air permeability, adhesiveness and operation convenience.

Inventors

  • CHANG XUESONG
  • SONG WEIJIAN
  • DU JIANQIANG
  • BAI QING
  • Yi Xiaoliang
  • LIU ZHAOYANG
  • LI TAO

Assignees

  • 海信冰箱有限公司

Dates

Publication Date
20260505
Application Date
20260128

Claims (10)

  1. 1. A protective film is used for protecting the surface of a metal part and comprises a matrix, a filler and an adhesive, wherein the filler comprises diatomite and chitosan, and the adhesive comprises a metal organic frame.
  2. 2. The method for preparing a protective film according to claim 1, comprising coating an adhesive solution containing the metal-organic framework on a film, drying and covalent organic framework growth by microwave-assisted heating, wherein the film comprises the filler.
  3. 3. The method for preparing a protective film according to claim 2, wherein the heating condition of the microwave-assisted heating is that the microwave irradiation power is 95-105W, the reaction temperature is 95-105 ℃ and the time is 4-5 minutes.
  4. 4. The method for preparing a protective film according to claim 2, wherein the adhesive solution is prepared by: Adding nano silicon dioxide particles and metal oxide into polyacrylic acid aqueous solution, fully stirring to obtain the nano silicon dioxide particles and metal oxide, then dripping propanol, and self-assembling to form polyacrylic acid spherical particles loaded with nano particles; dissolving zeolite imidazole ester framework material in methanol at 60-100 ℃, then injecting the obtained zeolite imidazole ester framework material solution into methanol solution dissolved with polyacrylic acid spherical particles, fully stirring and uniformly mixing to obtain mixed solution.
  5. 5. The method of producing a protective film according to claim 4, wherein a tackifying resin is added to the mixed solution and stirred sufficiently to obtain the adhesive solution.
  6. 6. The method of producing a protective film according to claim 2, wherein the film is produced by: granulating the breathable filler, namely dissolving the chitosan in a dilute acetic acid solution, uniformly dispersing the diatomite in water, performing ultrasonic treatment to avoid agglomeration, mixing the two phases, adding glutaraldehyde, stirring to form a homogeneous slurry, and granulating the slurry to obtain composite granules; and (3) film extrusion, namely conveying the composite granules, the antioxidant and the LDPE into a film blowing unit, blowing in a die through a double-screw extruder, and cooling, traction wheel pressing and edge planing to obtain the film.
  7. 7. The method for producing a protective film according to claim 6, wherein in the granulation of the air-permeable filler, the granulation comprises setting a heating temperature of 165-180 ℃ and a die temperature of 160-165 ℃ in a twin-screw granulator, and feeding the granules into a granulator after the granules are cooled, wherein the rotation speed is 50 rpm; In the film extrusion, the temperature of a screw is 160-185 ℃, the rotating speed is 45 rpm, the film is obtained by blowing in a die of 165-175 ℃ and cooling, traction wheel pressing and edge planing.
  8. 8. The method according to claim 5, wherein the metal oxide is at least one selected from zinc oxide, aluminum oxide and magnesium oxide, the zeolite imidazole ester skeleton material is at least one selected from 2-methylimidazole, 2-ethylimidazole, 2-propylimidazole and benzimidazole, and the tackifying resin is at least one selected from rosin resins and terpene resins; The ratio of the amount of the nano-silica particles to the amount of the metal oxide substance is 1:0.5-1.
  9. 9. The method of producing a protective film according to claim 6, wherein the antioxidant is at least one selected from the group consisting of antioxidant 1010, antioxidant 1076, antioxidant 2246, antioxidant 168, antioxidant 622, antioxidant 944, antioxidant 3114, antioxidant 626, and antioxidant 618.
  10. 10. A refrigerator characterized in that the surface of a metal part of the refrigerator is provided with the protective film according to claim 1.

Description

Protective film, preparation method thereof and refrigerator Technical Field The invention belongs to the field of protective films, and particularly relates to a protective film, a preparation method thereof and a refrigerator. Background In the production and assembly processes of household electrical appliances, the surface of the parts is often scratched due to the problems of collision, scratch and the like, so that the purchasing desire of consumers is influenced. In order to avoid such a circumstance, a protective film is often adhered to the surfaces of the metal piece and the plastic injection molding piece. Chinese patent CN119350992A discloses a stainless steel PE protective film and a preparation method thereof, wherein the protective film adopts a mixed optimized multilayer structure of LLDPE and LDPE, and additionally comprises components such as titanium dioxide, nano clay, nucleating agent, antioxidant, lubricant and the like, so that the comprehensive performance of the film is obviously improved, and the protection of stainless steel is realized. However, since the metal members have different shapes, machine coating cannot be performed, and conventionally, manual coating has been performed only in many cases. However, the manual pasting of the protective film often causes problems of uneven film surface, large air bubble quantity and the like, and the problems become common problems in the industry, and currently, a general solution is not available. Disclosure of Invention Aiming at the defects existing in the prior art, the technical problem to be solved by the invention is that the special-shaped metal part protective film is difficult to attach and is easy to generate bubbles, the protective film with the characteristics of excellent air permeability, adhesiveness and operation convenience is provided, and the preparation method and the refrigerator thereof. In order to solve the technical problems, the invention adopts the following technical scheme: the invention provides a protective film for protecting the surface of a metal part, which comprises a matrix, a filler and an adhesive, wherein the filler comprises diatomite and chitosan, and the adhesive comprises a metal organic frame. The invention also provides a preparation method of the protective film, which comprises the steps of coating adhesive solution containing a metal organic frame on a film, drying by adopting microwave-assisted heating and growing the covalent organic frame, wherein the film comprises filler. In some embodiments, the microwave-assisted heating is performed at a microwave irradiation power of 95-105W, a reaction temperature of 95-105 ℃ and a time of 4-5 minutes. In some embodiments, the adhesive solution is prepared by the following method: Adding nano silicon dioxide particles and metal oxide into polyacrylic acid aqueous solution, fully stirring to obtain the nano silicon dioxide particles and metal oxide, then dripping propanol, and self-assembling to form polyacrylic acid spherical particles loaded with nano particles; dissolving zeolite imidazole ester framework material in methanol at 60-100 ℃, then injecting the obtained zeolite imidazole ester framework material solution into methanol solution dissolved with polyacrylic acid spherical particles, fully stirring and uniformly mixing to obtain mixed solution. In some embodiments, a tackifying resin is added to the mixed solution and thoroughly stirred to provide an adhesive solution. In some embodiments, the film is prepared by: granulating the breathable filler, namely dissolving chitosan in a dilute acetic acid solution, uniformly dispersing diatomite in water, performing ultrasonic treatment to avoid agglomeration, mixing the two phases, adding glutaraldehyde, stirring to form a homogeneous slurry, and granulating the slurry to obtain composite granules; And (3) film extrusion, namely conveying the composite granules, the antioxidant and the LDPE into a film blowing unit, blowing in a die through a double-screw extruder, and cooling, traction wheel pressing and edge planing to obtain the film. In some embodiments, in the air-permeable filler granulation, the granulation comprises setting a heating temperature of 165-180 ℃ and a die head temperature of 160-165 ℃ in a double-screw granulator, taking out the die at a rotating speed of 50rpm, cooling, and then feeding the die into a granulator to obtain composite granules; In film extrusion, the temperature of a screw is 160-185 ℃, the rotating speed is 45rpm, the film is obtained by blowing in a die of 165-175 ℃ and cooling, traction wheel pressing and edge planing. In some embodiments, the metal oxide is selected from at least one of zinc oxide, aluminum oxide, magnesium oxide, the zeolitic imidazolate framework material is selected from one of 2-methylimidazole, 2-ethylimidazole, 2-propylimidazole, benzimidazole, the tackifying resin is selected from at least one of rosin resins, terpene resins; T