Production method of super-sticky touch pre-coating film

Abstract

The invention discloses a production method of a super-sticky touch pre-coating film, the pre-coating film comprises a touch layer, a base layer, a primer layer and a hot melt adhesive layer which are sequentially arranged from top to bottom, and the touch layer is composed of epoxy resin 5208, hexa-functional polyurethane acrylate, aluminum hydroxide, talcum powder, quartz powder, barium sulfate and zinc oxide; the base layer is prepared from PP, calcium carbonate, HDPE, a titanate coupling agent, liquid paraffin and POE; the hot melt adhesive layer is composed of 4, 4 '-diphenylmethane diisocyanate, polytetrahydrofuran ether dihydric alcohol and 1, 4-butanediol, the addition effect is good, and the touch layer is good in wear resistance.

Description

Technical Field

[0001] The invention relates to the technical field of BOPP films, in particular to a method for producing a super-sticky touch pre-coated 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 laminated with the printed matter. The current BOPP pre-coated film has low bonding strength of the hot melt adhesive layer, and the surface of the pre-coated film with a touch layer has the disadvantages of poor matte effect and poor wear resistance. 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 super-sticky tactile pre-coating film.

[0004] To solve the above problems, the technical solution of the present invention is: a method for producing a super-sticky tactile pre-coating film, the pre-coating film comprising a tactile layer, a base layer, a primer layer and a hot melt adhesive layer arranged in sequence from top to bottom; The touch layer is composed of epoxy resin 5208, hexafunctional polyurethane acrylate, aluminum hydroxide, talcum powder, quartz powder, barium sulfate, and zinc oxide; The base layer is composed of PP, calcium carbonate, HDPE, titanate coupling agent, liquid paraffin, and POE; The hot melt adhesive layer is composed of 4,4'-diphenylmethane diisocyanate, polytetramethylene glycol, and 1,4-butanediol; The production method comprises the following steps: (1) After calcium carbonate is dried, add it to a high-speed mixer, then add titanate coupling agent and liquid paraffin, mix at a low speed for 5 minutes, then add PP, HDPE, and POE and mix them evenly, and 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 be drawn into a film; (5) Apply the primer layer on the lower surface of the base layer and dry it after application; (6) preparing hot melt adhesive, compounding a hot melt adhesive layer on the surface of the primer layer, and then cooling and shaping; (7) The raw materials for the touch layer are mixed and coated on the upper surface of the base layer, and then dried to form a touch layer on the surface of the base layer; (8) Roll up the film.

[0005] Furthermore, in step (6), polytetramethylene glycol is first vacuum dehydrated at 105°C for 1.5 hours, cooled to 55°C, and then 4,4'-diphenylmethane diisocyanate is added, the temperature is raised to 80°C, and stirred under vacuum for 1.5 hours to obtain a prepolymer, and then 1,4-butanediol is added and stirred under vacuum for 0.5 hours to obtain a hot melt adhesive.

[0006] Furthermore, the components of the base layer are as follows by mass ratio: PP 54.5%, calcium carbonate 16%, HDPE 16%, titanate coupling agent 0.3%, liquid paraffin 0.2%, and POE 13%.

[0007] Furthermore, the components of the touch layer are as follows by mass ratio: 80% epoxy resin 5208, 5% hexafunctional polyurethane acrylate, 3% aluminum hydroxide, 5% talc, 3% quartz powder, 3% barium sulfate, and 1% zinc oxide.

[0008] Furthermore, the components of the hot melt adhesive layer are as follows by mass ratio: 50% of 4,4'-diphenylmethane diisocyanate, 25% of polytetramethylene glycol, and 25% of 1,4-butanediol.

[0009] The beneficial effects of the present invention are: Polytetramethylene glycol reacts with 4,4'-diphenylmethane diisocyanate to generate terminal isocyanate prepolymer, and then 1,4-butanediol is added to generate good bonding strength by reacting the prepolymer with moisture in the air. The hot melt adhesive layer is resistant to acid and alkali, and the synthesis process is simple. The talcum powder and barium sulfate of the touch layer have synergistic matting, good hiding power, aluminum hydroxide synergistic matting, fire retardant, good anti-settling property, good permeability after curing, good hiding power, good synergistic whitening effect, quartz powder synergistic matting, good wear resistance, zinc oxide plays the role of anti-settling and anti-flocculation; The base layer is modified by blending PP, HDPE and POE, and has good toughness. Implementation

[0010] 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 super-sticky tactile pre-coating film, the pre-coating film comprising a tactile layer, a base layer, a primer layer and a hot-melt adhesive layer arranged in sequence from top to bottom; The touch layer is composed of epoxy resin 5208, hexafunctional polyurethane acrylate, aluminum hydroxide, talcum powder, quartz powder, barium sulfate, and zinc oxide; The base layer is composed of PP, calcium carbonate, HDPE, titanate coupling agent, liquid paraffin, and POE; The hot melt adhesive layer is composed of 4,4'-diphenylmethane diisocyanate, polytetramethylene glycol, and 1,4-butanediol; The production method comprises the following steps: (1) After calcium carbonate is dried, it is added to a high-speed mixer, and then titanate coupling agent and liquid paraffin are added, and mixed at a low speed for 5 minutes to perform surface activation treatment, thereby increasing the miscibility between the inorganic filler and the resin, and then PP, HDPE, and POE are added and mixed and stirred evenly, and then the mixed raw materials are sent to the extruder for melt mixing and plasticization; (2) The molten melt is fed into the die, and the melt passes through the flat die orifice 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 be drawn into a film; (5) Apply the primer layer on the lower surface of the base layer and dry it after coating; (6) preparing hot melt adhesive, compounding a hot melt adhesive layer on the surface of the primer layer, and then cooling and shaping; (7) The raw materials for the touch layer are mixed and coated on the upper surface of the base layer, and then dried to form a touch layer on the surface of the base layer; (8) Roll up the film.

[0011] In step (6), polytetramethylene glycol is first vacuum dehydrated at 105°C for 1.5 hours, cooled to 55°C, and then 4,4'-diphenylmethane diisocyanate is added, the temperature is raised to 80°C, and stirred under vacuum for 1.5 hours to obtain a prepolymer, and then 1,4-butanediol is added and stirred under vacuum for 0.5 hours to obtain a hot melt adhesive.

[0012] The primer layer is composed of polyethyleneimine aqueous solution and alcohol.

[0013] The components of the base layer are as follows by mass ratio: PP 54.5%, calcium carbonate 16%, HDPE 16%, titanate coupling agent 0.3%, liquid paraffin 0.2%, and POE 13%.

[0014] The components of the touch layer are as follows by mass ratio: 80% of epoxy resin 5208, 5% of hexafunctional polyurethane acrylate, 3% of aluminum hydroxide, 5% of talc, 3% of quartz powder, 3% of barium sulfate, and 1% of zinc oxide.

[0015] The components of the hot melt adhesive layer are as follows by mass ratio: 50% of 4,4'-diphenylmethane diisocyanate, 25% of polytetramethylene glycol, and 25% of 1,4-butanediol.

[0016] Polytetramethylene glycol reacts with 4,4'-diphenylmethane diisocyanate to generate terminal isocyanate prepolymer, and then 1,4-butanediol is added to generate good bonding strength by reacting the prepolymer with moisture in the air. The hot melt adhesive layer is resistant to acid and alkali, and the synthesis process is simple. The talcum powder and barium sulfate of the touch layer have synergistic matting, good hiding power, aluminum hydroxide synergistic matting, fire retardant, good anti-settling property, good permeability after curing, good hiding power, good synergistic whitening effect, quartz powder synergistic matting, good wear resistance, zinc oxide plays the role of anti-settling and anti-flocculation; The base layer is modified by blending PP, HDPE and POE, and has good toughness.

Claims

1. A method for producing a super-sticky touch pre-coating film, the pre-coating film comprising a touch layer, a base layer, a primer layer and a hot melt adhesive layer arranged in sequence from top to bottom, Features: The touch layer is composed of epoxy resin 5208, hexafunctional polyurethane acrylate, aluminum hydroxide, talcum powder, quartz powder, barium sulfate, and zinc oxide; The base layer is composed of PP, calcium carbonate, HDPE, titanate coupling agent, liquid paraffin, and POE; The hot melt adhesive layer is composed of 4,4'-diphenylmethane diisocyanate, polytetramethylene glycol, and 1,4-butanediol; The production method comprises the following steps: (1) After calcium carbonate is dried, add it to a high-speed mixer, then add titanate coupling agent and liquid paraffin, mix at a low speed for 5 minutes, then add PP, HDPE, and POE and mix them evenly, and 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 be drawn into a film; (5) Apply the primer layer on the lower surface of the base layer and dry it after application; (6) preparing hot melt adhesive, compounding a hot melt adhesive layer on the surface of the primer layer, and then cooling and shaping; (7) The raw materials for the touch layer are mixed and coated on the upper surface of the base layer, and then dried to form a touch layer on the surface of the base layer; (8) Roll up the film.

2. The method for producing a super sticky touch pre-coating film according to claim 1, Features: In step (6), polytetramethylene glycol is first vacuum dehydrated at 105°C for 1.5 hours, cooled to 55°C, and then 4,4'-diphenylmethane diisocyanate is added, the temperature is raised to 80°C, and stirred under vacuum for 1.5 hours to obtain a prepolymer, and then 1,4-butanediol is added and stirred under vacuum for 0.5 hours to obtain a hot melt adhesive.

3. The method for producing a super sticky touch pre-coating film according to claim 1, Features: The components of the base layer are as follows by mass ratio: PP 54.5%, calcium carbonate 16%, HDPE 16%, titanate coupling agent 0.3%, liquid paraffin 0.2%, and POE 13%.

4. The method for producing a super sticky touch pre-coating film according to claim 1, Features: The components of the touch layer are as follows by mass ratio: 80% of epoxy resin 5208, 5% of hexafunctional polyurethane acrylate, 3% of aluminum hydroxide, 5% of talc, 3% of quartz powder, 3% of barium sulfate, and 1% of zinc oxide.

5. The method for producing a super sticky touch pre-coating film according to claim 1, Features: The components of the hot melt adhesive layer are as follows by mass ratio: 50% of 4,4'-diphenylmethane diisocyanate, 25% of polytetramethylene glycol, and 25% of 1,4-butanediol.