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CN-121973458-A - Production process and product of EB solidified food packaging composite film

CN121973458ACN 121973458 ACN121973458 ACN 121973458ACN-121973458-A

Abstract

The invention relates to the technical field of high polymer materials and packaging, in particular to a production process and a product of an EB (ethylene-propylene) cured food packaging composite film. The method comprises the following steps of S1, providing a food-grade packaging substrate, pretreating the packaging substrate, wherein the packaging substrate at least comprises a first packaging substrate and a second packaging substrate, S2, coating an EB adhesive on a pretreated surface of the first packaging substrate, S3, laminating the first packaging substrate coated with the EB adhesive and the pretreated surface of the second packaging substrate to obtain a composite packaging film, S4, carrying out electron beam curing treatment on the composite packaging film, S5, cooling and rolling the composite packaging film after the electron beam curing treatment to obtain a composite packaging film finished product, and the viscosity of the EB adhesive at 100 ℃ is 1000-10000cps. The obtained composite film has the advantages of environmental protection, strong initial positioning capability, high-efficiency production and reliable performance, and can meet the use requirements of food packaging materials.

Inventors

  • LI XINXIONG
  • WANG DEXIU
  • ZHANG DONGMING

Assignees

  • 邦弗特新材料股份有限公司

Dates

Publication Date
20260505
Application Date
20260211

Claims (10)

  1. 1. The production process of the EB solidified food packaging composite film is characterized by comprising the following steps of: s1, providing a food-grade packaging substrate and preprocessing the packaging substrate, wherein the packaging substrate at least comprises a first packaging substrate and a second packaging substrate; S2, coating the EB adhesive on a pretreatment surface of the first packaging substrate; S3, pressing the pretreatment surfaces of the first packaging substrate coated with the EB adhesive and the second packaging substrate to obtain a composite packaging film; s4, carrying out electron beam curing treatment on the composite packaging film; s5, cooling and rolling the composite packaging film after the electron beam curing treatment to obtain a finished product of the composite packaging film; The viscosity of the EB adhesive is 1000-10000cps at 100 ℃.
  2. 2. The process for producing the EB cured food packaging composite film according to claim 1, wherein the step S4 specifically comprises the steps of conveying the composite packaging film to an electron beam curing device through a production line, and performing radiation curing under inert gas atmosphere to enable the EB adhesive to be crosslinked instantaneously; the radiation curing condition in the step S4 is that the accelerating voltage is 80-300kV, the irradiation dose is 20-100kGy, and the transmission speed of a production line is 50-300m/min.
  3. 3. The process for producing an EB cured food packaging composite film as defined in claim 1, wherein the sizing amount of the EB adhesive in the step S2 is 1.5-4.0g/m2, and the coating temperature is 60-120 ℃.
  4. 4. The process for producing an EB cured food packaging composite film as defined in claim 1, wherein the pressure of the lamination in the step S3 is 0.2 to 0.6MPa and the lamination temperature is 10 to 60 ℃.
  5. 5. The process for producing the EB cured food packaging composite film according to claim 3, wherein the coating mode in the step S2 is multi-roll micro-gravure coating, and the number of rolls in the multi-roll micro-gravure coating is 3-5.
  6. 6. The process for producing the EB cured food packaging composite film as defined in claim 1, wherein the EB adhesive comprises the following preparation raw materials in percentage by weight: 60-95% of oligomer; 0-30% of tackifying resin; 1-25% of a polyfunctional reactive diluent; 0-5% of an auxiliary agent; the oligomer comprises one or more of urethane acrylate, polyester acrylate and epoxy acrylate; the EB adhesive does not contain solvents, monofunctional reactive diluents or photoinitiators.
  7. 7. The process for producing EB cured food packaging composite film as defined in claim 6, wherein the oligomer includes urethane acrylate, which is polyacrylate/acrylic modified urethane or biomass urethane acrylate.
  8. 8. An EB cured food packaging composite film, characterized in that it is prepared by the production process according to any one of claims 1 to 7.
  9. 9. The EB cured food packaging composite film as defined in claim 8, wherein the structure of the EB cured food packaging composite film includes at least a first packaging substrate layer, an adhesive layer and a second packaging substrate layer which are laminated.
  10. 10. The EB cured food packaging composite film according to claim 9, wherein the bonding layer is a product of an EB adhesive which is cured by electron beam irradiation crosslinking, and the bonding layer has no solvent or photoinitiator residues.

Description

Production process and product of EB solidified food packaging composite film Technical Field The invention relates to the technical field of high polymer materials and packaging, in particular to a production process and a product of an EB (ethylene-propylene) cured food packaging composite film. Background In the current production practice of the food packaging composite film industry, solvent-type polyurethane adhesives are widely used as bonding materials. The adhesive has the advantage of mature performance, but has the problems of large VOC emission, environmental pollution, residual solvent migration and food pollution, high production safety hidden danger (explosion risk), high energy consumption (the requirement of removing the solvent by a drying tunnel as long as tens of meters) and the like in the production process of the food flexible packaging composite film. In order to solve the environmental protection problem of the traditional adhesive, the prior production technology tries to use the solvent-free polyurethane adhesive in the compounding process of the food packaging composite film. However, the adhesive is usually a bi-component system, accurate metering and mixing are required, the curing reaction depends on environmental humidity and temperature, the final performance can be achieved only by curing (curing) for 24-48 hours, the production efficiency of the food packaging composite film is severely restricted, a large amount of inventory space is occupied, the delivery period is prolonged, and the practicability is poor. Under such circumstances, electron Beam (EB) curing technology has been attracting attention in recent years due to advantages such as zero emission of VOCs, instantaneous curing (in seconds), low energy consumption, no light initiator residue, and the like, and has been used in the field of flexible packaging of foods. However, in the production environment of the food packaging composite film, the EB curing technology still has a plurality of problems to be solved. The Chinese patent CN110387208B discloses an electron beam curing composite adhesive, a flexible packaging composite film and a preparation method thereof, solves the problems of low mixing and curing efficiency of solvent-free double-component glue at high temperature by using the electron beam curing composite adhesive, realizes quick curing and high adhesive force of the glue, improves the production efficiency, reduces the quality accidents, and is suitable for various packaging materials. The Chinese patent application CN120399631A discloses a solvent-free adhesive for the electron beam curing flexible package and a preparation method thereof, and the hydroxyl-terminated hyperbranched polymer prepared by introducing 3- (methacryloyloxy) propyl trimethoxysilane and dihydroxyquaternary ammonium salt into the solvent-free adhesive for the electron beam curing flexible package is used as a crosslinking component, so that the high adhesive force and the improvement of the wet heat resistance of the composite film are realized. Although the EB curing technology solves the problem of environmental protection, the viscosity of the adhesive is low, the initial positioning capability is insufficient, interlayer displacement is easy to generate in the high-speed traction process, particularly, when the multilayer composite operation is performed, the condition that the first adhesive is not cured by the EB when the second adhesive is coated can occur, the displacement or tunnel effect is easy to generate, and the barrier property of the packaging film is influenced. Under such a background, there is a need in the food packaging industry to provide a process for producing a composite film for food packaging, which has the advantages of environmental protection (no VOC or PI), strong initial positioning capability, rapid production (no curing period), and reliable performance. Disclosure of Invention Aiming at the technical problems that the environmental protection performance, the production efficiency and the like of the existing adhesive cannot be considered, the invention provides the production process of the EB cured food packaging composite film and the prepared composite film product, and the food packaging composite film product which has the environmental protection performance (no VOC and no PI), strong initial positioning capability, quick production (no maintenance period) and reliable performance is obtained by matching the specific production process with the EB adhesive, and the invention has strong operability, can realize mass production and has wide application prospect. The first aspect of the invention provides a production process of an EB cured food packaging composite film, which comprises the following steps: s1, providing a food-grade packaging substrate and preprocessing the packaging substrate, wherein the packaging substrate at least comprises a first packaging substrate and a second