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CN-116922911-B - High-strength single-sided polar BOPP aluminized film and preparation method thereof

CN116922911BCN 116922911 BCN116922911 BCN 116922911BCN-116922911-B

Abstract

The invention relates to the technical field of BOPP films, and discloses a high-strength single-sided polar BOPP aluminized film and a preparation method thereof, wherein the reinforcing layer comprises, by weight, 90-95% of homo-polypropylene and 5-10% of anti-adhesion master batch I, the core layer comprises, by weight, 75-80% of homo-polypropylene, 1-5% of irregular silicon dioxide and 15-20% of POE thermoplastic elastomer, the heat sealing layer comprises, by weight, 60-70% of ternary random copolymer polypropylene and 30-40% of anti-adhesion master batch II, wherein the anti-adhesion master batch II comprises, by weight, lecithin, isosorbide and sodium dodecyl benzene sulfonate homo-polypropylene. The aluminized film has higher polarity, interlayer peel strength and impact strength, reduces the production cost of the BOPP aluminized film, and widens the application range of the BOPP film.

Inventors

  • HOU CHANGXU
  • WANG HONGBING
  • ZHANG SHAOWEI
  • SHI LEI
  • Nian Chenrui
  • SHENG ZHONG

Assignees

  • 安徽国风新材料股份有限公司

Dates

Publication Date
20260505
Application Date
20230707

Claims (10)

  1. 1. The high-strength single-sided polar BOPP aluminized film is characterized by sequentially comprising a reinforcing layer, a core layer, a heat sealing layer and an aluminized layer; The reinforcing layer consists of 90-95% of homo-polypropylene and 5-10% of anti-adhesion master batch I, wherein the anti-adhesion master batch I comprises superfine activated calcium carbonate, stearic acid and homo-polypropylene; The core layer is composed of 75-80% of homo-polypropylene, 1-5% of irregular silicon dioxide and 15-20% of POE thermoplastic elastomer by weight percentage; The heat sealing layer is composed of, by weight, 60-70% of ternary random copolymer polypropylene and 30-40% of anti-adhesion master batch II, wherein the anti-adhesion master batch II comprises lecithin, isosorbide, sodium dodecyl benzene sulfonate and homo-polypropylene.
  2. 2. The high-strength single-sided polar BOPP aluminized film according to claim 1, wherein the anti-adhesion masterbatch I comprises the following raw materials, by weight, 10-20% of superfine activated calcium carbonate, 10-20% of stearic acid, and 70-80% of homo-polypropylene.
  3. 3. The high-strength single-sided polar BOPP aluminizer of claim 1, wherein the ultra-fine activated calcium carbonate particle size is 190-210nm with a whiteness of greater than 93; Dissolving the stearic acid in deionized water at 50-60 ℃ to form 8-13wt% of stearic acid solution, adding the superfine activated calcium carbonate into the solution, and stirring the solution until an emulsion is formed, wherein the viscosity of the emulsion is 80-90 mPa.s.
  4. 4. The high strength single sided polar BOPP aluminized film of claim 1, wherein the random silica particle size range is 2-4 μιη.
  5. 5. The high strength single sided polar BOPP aluminized film of claim 1, wherein the POE-based thermoplastic elastomer has a melt index of 5-10g/min.
  6. 6. The high-strength single-sided polar BOPP aluminized film according to claim 1, wherein the anti-adhesion masterbatch II comprises raw materials of, by weight, 10-20% of lecithin, 10-20% of isosorbide, 10-20% of sodium dodecyl benzene sulfonate, and 50-70% of homo-polypropylene.
  7. 7. The high-strength single-sided polar BOPP aluminum foil according to claim 1, wherein the lecithin has an HLB value of 4-10 and the sodium dodecyl benzene sulfonate has a purity of 95% or more.
  8. 8. The high-strength single-sided polar BOPP aluminized film according to claim 1, wherein the total thickness of the reinforcing layer, the core layer and the heat sealing layer is 20-40 μm, and the thickness percentage of each layer is 2-7% of the reinforcing layer, 80-85% of the core layer and 8-13% of the heat sealing layer.
  9. 9. A method for producing a high-strength single-sided polar BOPP aluminized film according to any one of claims 1 to 8, comprising the steps of: S1, preparing an anti-adhesion master batch I, namely dissolving stearic acid in deionized water at 50-60 ℃ to form 8-13wt% of stearic acid solution, adding superfine activated calcium carbonate into the solution, stirring the solution to form emulsion, filtering the emulsion, and drying the emulsion in vacuum to obtain a mixed solid material I; S2, preparing an anti-sticking master batch II, namely sequentially adding sodium dodecyl benzene sulfonate and isosorbide into water, stirring to obtain a mixed solution, dissolving lecithin into ethanol at 50-60 ℃, stirring to obtain a lecithin solution, adding the lecithin solution into the mixed solution, stirring, filtering, and vacuum drying to obtain a mixed solid material II; S3, melting, namely respectively adding the raw materials of the reinforcing layer, the raw materials of the core layer and the raw materials of the heat sealing layer into an extruder for melt extrusion to respectively obtain a core layer melt, a reinforcing layer melt and a heat sealing layer melt; S4, preparing a prefabricated film, namely respectively filtering the reinforcing layer melt, the core layer melt and the heat sealing layer melt, converging and extruding the reinforcing layer melt, the core layer melt and the heat sealing layer melt at the lip of a three-layer structure die head to form a film, attaching the film to a chilling roller by using a high-pressure air knife for quenching to form a casting sheet, cooling and shaping by using circulating cooling water; s5, preparing the BOPP aluminizer, namely aluminizing the surface of the heat seal layer of the prefabricated film to form an aluminum film layer, and obtaining the BOPP aluminizer.
  10. 10. The method for producing a high-strength single-sided polar BOPP aluminized film according to claim 9, wherein in S2, after adding the lecithin solution to the mixed solution, the HLB of the system is controlled to be 10-24; in S5, aluminum plating is performed by vacuum vapor deposition or plasma plating.

Description

High-strength single-sided polar BOPP aluminized film and preparation method thereof Technical Field The invention relates to the technical field of BOPP films, in particular to a high-strength single-sided polar BOPP aluminized film and a preparation method thereof. Background The aluminizer is a composite flexible packaging material formed by plating a layer of extremely thin metal aluminum on the surface of a plastic film by adopting a special process, and is a packaging material with low cost, attractive appearance, excellent performance and strong practicability because of the characteristics of the plastic film and the metal. The aluminum plating on the surface of the film has the functions of shading light and preventing ultraviolet radiation, prolongs the shelf life of the content, improves the brightness of the film, replaces aluminum foil to a certain extent, and has low cost, attractive appearance and good barrier property. Therefore, the aluminizer has very wide application in composite packaging, and is mainly applied to the packaging of dried and puffed foods such as biscuits and the like and the outer packaging of some medicines and cosmetics at present. The aluminum plating material is BOPET, BOPP, CPP. The BOPP film is a nonpolar material, and is used for aluminizing films, corona treatment is needed first to increase production cost, the polarity of the film is poor, even if aluminizing is carried out after corona treatment, aluminizing fastness is not as good as BOPET, the peeling strength between an aluminized layer and a secondary outer layer of the BOPP aluminizing film is basically less than or equal to 0.5N/15mm, so that the application and the application range of the BOPP aluminizing film are greatly limited, the heat sealing layer of the existing BOPP aluminizing film is higher in temperature, oxygen is easy to permeate into heat sealing positions when the BOPP aluminizing film is applied to commodity packaging, and the application and development of the BOPP aluminizing film are limited due to poor film impact toughness, particularly low-temperature impact strength. Disclosure of Invention Based on the technical problems in the background art, the invention provides the high-strength single-sided polar BOPP aluminized film and the preparation method thereof, and the problem of printing of the polypropylene-based film caused by polarity difference is solved by constructing a polar hierarchy structure, and meanwhile, the film is endowed with higher impact strength by the existence of an elastomer. The invention has higher polarity, interlayer peeling strength and impact strength, reduces the production cost of the BOPP aluminized film and widens the application range of the BOPP film. The invention provides a high-strength single-sided polar BOPP aluminized film, which sequentially comprises a reinforcing layer, a core layer, a heat sealing layer and an aluminized layer; the reinforcing layer consists of 90-95% of homo-polypropylene and 5-10% of anti-adhesion master batch I, wherein the anti-adhesion master batch I comprises superfine activated calcium carbonate, stearic acid and homo-polypropylene; The core layer is composed of 75-80% of homo-polypropylene, 1-5% of irregular silicon dioxide and 15-20% of POE thermoplastic elastomer by weight percentage; The heat sealing layer is composed of, by weight, 60-70% of ternary random copolymer polypropylene and 30-40% of anti-adhesion master batch II, wherein the anti-adhesion master batch II comprises lecithin, isosorbide, sodium dodecyl benzene sulfonate and homo-polypropylene. Preferably, the anti-adhesion master batch I comprises, by weight, 10-20% of superfine activated calcium carbonate, 10-20% of stearic acid and 70-80% of homo-polypropylene. Preferably, the particle size of the superfine active calcium carbonate is 190-210nm, the whiteness is more than 93, and the viscosity of the formed emulsion is 80-90 mPa.s. Preferably, the random silica particle size is in the range of 2-4 μm. Preferably, the melt index of the POE thermoplastic elastomer is 5-10g/min; Preferably, the anti-adhesion master batch II comprises, by weight, 10-20% of lecithin, 10-20% of isosorbide, 10-20% of sodium dodecyl benzene sulfonate and 50-70% of homo-polypropylene. Preferably, the lecithin has an HLB value of 4 to 10. Preferably, the total thickness of the reinforcing layer, the core layer and the heat sealing layer is 20-40 mu m, wherein the thickness percentage of each layer is 2-7% of the reinforcing layer, 80-85% of the core layer and 8-13% of the heat sealing layer. The invention also provides a preparation method of the high-strength single-sided polar BOPP aluminized film, which comprises the following steps: S1, preparing an anti-adhesion master batch I, namely dissolving stearic acid in deionized water at 50-60 ℃ to form 8-13wt% of stearic acid solution, adding superfine activated calcium carbonate into the solution, stirring the solution to form