Production method of long-acting antistatic pre-coating base film

Abstract

The invention discloses a production method of a long-acting antistatic pre-coated base film. The pre-coated base film comprises a base layer and an antistatic coating coated on the surface of the base layer, the base layer is prepared from the following raw materials: PP, carbon black, POE, talcum powder, an antioxidant and a lubricant. A small amount of conductive carbon black is added into the base layer, so that the base layer has an antistatic effect, and a small amount of carbon black has small influence on PP performance. 1, 6-hexanediol diacrylate, diethanol amine and a fluoroboric acid diethyl ether solution of the antistatic coating react to generate a photosensitive quaternary ammonium salt, the photosensitive quaternary ammonium salt is mixed with PUA and a photoinitiator to obtain a UV curing adhesive, a curing film is colorless, transparent and flat and has good antistatic property and washing resistance, and the base layer and the antistatic coating together achieve a long-acting antistatic effect.

Description

Technical Field

[0001] The invention relates to the technical field of BOPP films, in particular to a method for producing a long-lasting antistatic pre-coated base film. Background Art

[0002] Pre-coated film is a flexible packaging material used for printed products. It is first coated on the film by the pre-coated film processing factory according to the specifications and format, and then rewound for the user to choose, and then compounded with the printed matter. Pre-coated base film usually uses BOPP base film, but PP has poor antistatic effect. When long-term antistatic effect is required, antistatic agent or conductive filler is usually added. Conductive filler needs to be added by 15%-20%, which is a large amount, which has a great impact on the performance of PP. Summary of the invention

[0003] In view of the above-mentioned defects of the prior art, an object of the present invention is to provide a method for producing a long-lasting antistatic pre-coated base film.

[0004] To solve the above problems, the technical solution of the present invention is: a method for producing a long-lasting antistatic pre-coated base film, the pre-coated base film comprising a base layer and an antistatic coating coated on the surface of the base layer; The base material is composed of PP, carbon black, POE, talcum powder, antioxidant and lubricant; The raw materials of the antistatic coating are composed of 1,6-hexanediol diacrylate, diethanolamine, fluoroboric acid ether solution, PUA, and photoinitiator; The production method comprises the following steps: (1) Add the base material into a high-speed mixer and mix them evenly, then send the mixed raw materials into an extruder for melt mixing and plasticization; (2) The molten melt is fed into the die, and the melt passes through the flat die opening to form a molten sheet; (3) Using an air knife to attach the sheet to a chilled roller and cooling it in a water bath to shape the sheet into a cast sheet; (4) The cast sheet is then passed through a longitudinal stretching machine and a transverse stretching machine to draw the sheet into a film to obtain a base layer; (5) 1,6-hexanediol diacrylate and diethanolamine are mixed and reacted, and then a fluoroboric acid ether solution is added to react, and the ether is removed under reduced pressure to obtain a colorless transparent liquid, and the colorless transparent liquid is mixed with PUA and a photoinitiator to obtain a UV curing adhesive; (6) coating the UV curing adhesive on the surface of the base layer and curing it with a UV curing machine to form an antistatic coating on the surface of the base layer to obtain a pre-coated base film; (7) Immerse the pre-coated base film in water and scrub it, then blow it dry and measure its surface resistance.

[0005] Furthermore, the components of the base material are as follows by mass ratio: PP 64%, carbon black 10%, POE 10%, talc 15%, antioxidant 0.5%, and lubricant 0.5%.

[0006] Furthermore, the components of the antistatic coating raw material are as follows by mass ratio: 43% of 1,6-hexanediol diacrylate, 16.5% of diethanolamine, 35% of fluoroboric acid ether solution, 4.5% of PUA, and 1% of photoinitiator.

[0007] The beneficial effects of the present invention are as follows: a small amount of conductive carbon black is added to the base layer so that the base layer has an antistatic effect, and a small amount of carbon black has little effect on the performance of PP; 1,6-hexanediol diacrylate, diethanolamine, and ethereal fluoroboric acid solution can react to generate a photosensitive quaternary ammonium salt, which is mixed with PUA and a photoinitiator to obtain a UV curing adhesive, and the cured film is colorless, transparent and smooth, and has good antistatic properties and water washability, and the base layer and the antistatic coating together have a long-lasting antistatic effect. Implementation

[0008] In order to more intuitively and completely understand the technical solution of the present invention, a non-limiting feature description is now provided as follows: A method for producing a long-lasting antistatic pre-coated base film, the pre-coated base film comprising a base layer and an antistatic coating coated on the surface of the base layer; The base material is composed of PP, carbon black, POE, talcum powder, antioxidant and lubricant; The raw materials of the antistatic coating are composed of 1,6-hexanediol diacrylate, diethanolamine, fluoroboric acid ether solution (the mass percentage of fluoroboric acid is 40%), PUA, and photoinitiator; The production method comprises the following steps: (1) Add the base material into a high-speed mixer and mix them evenly, then send the mixed raw materials into an extruder for melt mixing and plasticization; (2) The molten melt is fed into the die, and the melt passes through the flat die opening to form a molten sheet; (3) Using an air knife to attach the sheet to a chilled roller and cooling it in a water bath to shape the sheet into a cast sheet; (4) The cast sheet is then passed through a longitudinal stretching machine and a transverse stretching machine to draw the sheet into a film to obtain a base layer; (5) 1,6-hexanediol diacrylate and diethanolamine are mixed and reacted, and then a fluoroboric acid ether solution is added to react, and the ether is removed under reduced pressure to obtain a colorless transparent liquid, and the colorless transparent liquid is mixed with PUA and a photoinitiator to obtain a UV curing adhesive; (6) coating the UV curing adhesive on the surface of the base layer and curing it with a UV curing machine to form an antistatic coating on the surface of the base layer to obtain a pre-coated base film; (7) Immerse the pre-coated base film in water and scrub it, then blow it dry and measure its surface resistance.

[0009] The components of the base material are as follows by mass ratio: PP 64%, carbon black 10%, POE 10%, talcum powder 15%, antioxidant 0.5%, lubricant 0.5%. The antioxidant is antioxidant B215, and the lubricant is one or more of PE wax, calcium stearate, and dimethyl dithiocarbamate iron.

[0010] The components of the antistatic coating raw material are as follows by mass ratio: 43% of 1,6-hexanediol diacrylate, 16.5% of diethanolamine, 35% of fluoroboric acid ether solution, 4.5% of PUA, and 1% of photoinitiator. The photoinitiator is one or more of α-hydroxyalkyl phenone, α-aminoalkyl phenone, benzophenone, and 2,4-dihydroxybenzophenone.

[0011] The base layer has antistatic effect by adding a small amount of conductive carbon black. A small amount of carbon black has little effect on the performance of PP. The reaction of 1,6-hexanediol diacrylate, diethanolamine, and fluoroboric acid ether solution can generate photosensitive quaternary ammonium salts. The UV curing adhesive obtained by mixing with PUA and photoinitiator has a colorless, transparent and flat cured film with good antistatic and water-washing resistance. The base layer and antistatic coating together play a long-term antistatic effect. The quaternary ammonium salt itself has a photocurable group. The ultraviolet light curing active group participates in the reaction to form a macromolecule. The quaternary ammonium salt group is chemically bonded in the cured film network. When it migrates to the surface of the film, it will not be dissolved even after repeated water washing, and it still has good antistatic durability.

Claims

1. Production method of long-lasting antistatic pre-coated base film, Features: The pre-coated base film comprises a base layer and an antistatic coating coated on the surface of the base layer; The base material is composed of PP, carbon black, POE, talcum powder, antioxidant and lubricant; The raw materials of the antistatic coating are composed of 1,6-hexanediol diacrylate, diethanolamine, fluoroboric acid ether solution, PUA, and photoinitiator; The production method comprises the following steps: (1) Add the base material into a high-speed mixer and mix them evenly, then send the mixed raw materials into an extruder for melt mixing and plasticization; (2) The molten melt is fed into the die, and the melt passes through the flat die opening to form a molten sheet; (3) Using an air knife to attach the sheet to a chilled roller and cooling it in a water bath to shape the sheet into a cast sheet; (4) The cast sheet is then passed through a longitudinal stretching machine and a transverse stretching machine to draw the sheet into a film to obtain a base layer; (5) 1,6-hexanediol diacrylate and diethanolamine are mixed and reacted, and then a fluoroboric acid ether solution is added to react, and the ether is removed under reduced pressure to obtain a colorless transparent liquid, and the colorless transparent liquid is mixed with PUA and a photoinitiator to obtain a UV curing adhesive; (6) coating the UV curing adhesive on the surface of the base layer and curing it with a UV curing machine to form an antistatic coating on the surface of the base layer to obtain a pre-coated base film; (7) Immerse the pre-coated base film in water and scrub it, then blow it dry and measure its surface resistance.

2. The method for producing the long-lasting antistatic pre-coated base film according to claim 1, Features: The components of the base material are as follows by mass ratio: PP 64%, carbon black 10%, POE 10%, talc 15%, antioxidant 0.5%, and lubricant 0.5%.

3. The method for producing the long-lasting antistatic pre-coated base film according to claim 1, Features: The components of the antistatic coating raw material are as follows by mass ratio: 43% of 1,6-hexanediol diacrylate, 16.5% of diethanolamine, 35% of fluoroboric acid ether solution, 4.5% of PUA, and 1% of photoinitiator.