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CN-122011952-A - Multipurpose high-viscosity repositionable glass film and preparation method thereof

CN122011952ACN 122011952 ACN122011952 ACN 122011952ACN-122011952-A

Abstract

The invention relates to the technical field of glass decoration protective film processing and manufacturing, and discloses a multipurpose high-viscosity re-attachable glass film and a preparation method thereof. The preparation method comprises the steps of taking a flexible polymer film as a base material, forming an activated surface through corona treatment with specific parameters, coating an ink-jet printing layer containing inorganic nano silicon dioxide, drying, preparing an embossed polyethylene release film, coating aqueous hot melt adhesive in a dot mode to form a bonding layer, compounding the base material and the release film through hot pressing, curing and cutting to obtain a finished product. According to the invention, through fine process parameter management and control, the surface activity of the base material and the structure of the adhesive layer are optimized, the product has high viscosity and re-adhesion, has no bubbles when being attached, is easy to construct, has firm adhesion of a printing layer, clear patterns, is weather-proof and environment-friendly, meets the requirements of multi-scene glass film pasting, and has stable process and suitability for large-scale production.

Inventors

  • LI BINGJIE
  • SUN YUN
  • LI JIANPING

Assignees

  • 江苏耐斯数码科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260327

Claims (10)

  1. 1. The preparation method of the multipurpose high-viscosity repositionable glass film is characterized by comprising the following steps of: A, selecting a flexible polymer film with the thickness of 25-100 mu m as a substrate layer, placing the substrate layer in a clean room, treating one surface of the film by an online corona treatment machine with the treatment power of 1.5-2.5 kW and the treatment speed of 10-20 m/min to increase the surface tension to more than 50dyn/cm, and forming an activated surface for coating an ink-jet printing layer; B, preparing an ink-jet printing layer coating liquid, wherein the coating liquid comprises 5-8% of inorganic nano silicon dioxide, 2-4% of polyvinylpyrrolidone, 0.1-0.3% of flatting agent and deionized water by mass percent, placing the substrate layer obtained in the step a at the unreeling end of a precision coater to enable the activated surface to face upwards, uniformly applying the coating liquid on the activated surface in a micro-gravure coating mode under the conditions of 20-25 ℃ and 45-55% of humidity, wherein the coating thickness of a wet film is 10-15 mu m, immediately introducing the substrate layer into a baking channel with the temperature of 80-100 ℃ for drying, and finally forming the ink-jet printing layer with the dry film thickness of 5-8 mu m, wherein the drying time is 1-2 minutes; C, introducing the substrate layer with the ink-jet printing layer processed in the step b into a preheating area, setting the preheating temperature to be 50-60 ℃, and adjusting the winding and unwinding tension to enable the substrate layer to be flat and wrinkle-free before entering a compounding process, wherein the winding tension is controlled to be 1.5 kgf-2.5 kgf; Preparing a release film base material by a casting process, namely immediately pressing a film surface by an embossing roller with a micro dot pattern when the casting forming temperature is in a range of 150-180 ℃ to form an embossing unit with the diameter of 0.5mm, and preparing a polyethylene embossing release film, wherein an aqueous hot melt adhesive is coated on the embossing surface of the polyethylene embossing release film by an anilox roller coating device, the coating temperature is 25-30 ℃, the viscosity of the aqueous hot melt adhesive is 1500 cps-2500 cps, the line number of the anilox roller is 150 lines/inch, the coating speed is controlled to be 15-25 m/min, the glue solution forms a matrix structure matched with the embossing on the surface of the release film, and then the matrix structure enters a baking channel with the temperature of 90-110 ℃ for curing, the curing time is 1.5-3 minutes, and a bonding layer with the dry adhesive thickness of 5-20 mu m is formed; Step e, the preheated substrate layer obtained in the step C is led into a double-roller compounding machine to be compounded by hot pressing with one surface with the ink jet printing layer facing outwards and the other surface opposite to the adhesive surface of the bonding layer which is cured on the polyethylene embossing release film obtained in the step d, wherein the temperature of a hot-pressing compounding roller is set to be 70-80 ℃, the line pressure is set to be 3-5 kgf/cm, and the compound line speed is kept consistent with the coating speed of the step d; And f, putting the semi-finished product compounded in the step e into a post-curing area with the temperature of 45-55 ℃ for curing treatment for 24-48 hours to form stable interface bonding between the laminating layer and the inner surface of the substrate layer, cutting the wide coiled material into width specifications required by customers through a cutting machine after curing, and rolling in a constant temperature and humidity environment, wherein the rolling tension is controlled to be 1.0 kgf-1.5 kgf, so that the finished coiled material is obtained.
  2. 2. The method for preparing the multipurpose high-viscosity repositionable glass film according to claim 1, wherein the online corona treatment machine in the step a adopts a double-electrode structure, the electrode spacing is 1.2mm, the treatment frequency is 20kHz, and the uniform micro-roughening structure can be formed on the surface of the substrate layer film in the treatment process.
  3. 3. The method for preparing the multipurpose high-viscosity repositionable glass film according to claim 1, wherein in the step b, the particle size range of the inorganic nano silicon dioxide is 20nm to 50nm, and when preparing the coating liquid, the inorganic nano silicon dioxide is uniformly dispersed in deionized water under the action of ultrasonic wave for 30 minutes at the power of 500W, polyvinylpyrrolidone and a flatting agent are added, and stirring is carried out for 2 hours at the normal temperature and the rotating speed of 300rpm, so that a uniform and stable coating liquid suspension system is formed.
  4. 4. The method for preparing the multipurpose high-viscosity repositionable glass film according to claim 1, wherein the specific technological parameters of the micro gravure coating mode in the step b are that a gravure roll with a net wire number of 200 wires/inch is used, the scraper pressure is 0.2MPa, the coating angle is 30 ℃, the coating gap is set to be 0.1mm, the thickness uniformity of a coated wet film is ensured, and the coating CV value is controlled within 3%.
  5. 5. The method for preparing a multi-purpose highly adhesive repositionable glass film according to claim 1, wherein the anilox roller coating apparatus in step d comprises immersing anilox roller coated with glue solution in a glue storage tank, controlling the amount of glue solution transferred to the roller surface by a metering scraper, transferring the glue solution to the embossed surface of a polyethylene embossed release film running at a constant speed by a roller-to-roller manner, and controlling the running tension of the release film to be 1.0kgf to 1.2kgf during the transfer process.
  6. 6. The method for preparing the multipurpose high-viscosity repositionable glass film according to claim 1, wherein the composition of the aqueous hot melt adhesive in the step d is that the aqueous hot melt adhesive comprises, by mass, 35 to 45 parts of ethylene-vinyl acetate copolymer emulsion, 20 to 30 parts of acrylic pressure-sensitive adhesive emulsion, 5 to 10 parts of hydrogenated rosin glyceride, 1 to 3 parts of polyethylene glycol and 0.5 to 1 part of polyether modified polysiloxane defoamer.
  7. 7. The method for preparing the multipurpose high-viscosity repositionable glass film according to claim 1, wherein in the step e, the composite roller of the pair roller compounding machine is a silica gel coated roller, the hardness is between 60 and 70 degrees of Shore A, and when the composite roller is compounded, the gap between the two rollers is controlled to be between 1.1 and 1.2 times of the total thickness of the substrate layer, the laminating layer and the release film layer.
  8. 8. The method for preparing the multipurpose high-viscosity repositionable glass film according to claim 1, wherein the method is characterized in that the method further comprises a step e1 of preliminary cooling and shaping, wherein the compounded semi-finished product is immediately introduced into a cooling roller set with the temperature of 15-20 ℃, the surface temperature of the cooling roller is 10-15 ℃, and the cooling time is 5-10 seconds, so that the composite structure is preliminary shaped, and interlayer displacement caused by thermal stress is prevented.
  9. 9. The method for preparing the multipurpose high-viscosity repositionable glass film according to claim 1, wherein the control condition of the constant temperature and humidity environment in the step f is that the temperature is 23 ℃ plus or minus 2 ℃ and the relative humidity is 50% plusor minus 5%, the rotating speed of a circular knife of a slitting machine is 500rpm to 800rpm, and the width of burrs generated during slitting is less than 0.2mm.
  10. 10. The multipurpose high-viscosity repositionable glass film prepared by the preparation method according to any one of claims 1 to 9 is characterized by comprising an ink-jet printing layer, a substrate layer, a laminating layer and a release film layer which are sequentially arranged from outside to inside, wherein the ink-jet printing layer is a surface which is subjected to corona treatment and is coated with a mixed coating of inorganic nano silicon dioxide and polyvinylpyrrolidone, the substrate layer is a nylon film or a polyethylene terephthalate film which is subjected to preheating and tension control, the laminating layer is an aqueous hot melt adhesive layer which is coated on an embossing surface of the polyethylene embossing release film through an anilox roller and has a matrix dot-shaped structure, and the release film layer is a polyethylene embossing release film with micro embossing units with diameters of 0.5 mm.

Description

Multipurpose high-viscosity repositionable glass film and preparation method thereof Technical Field The invention relates to the technical field of glass decoration protective film processing and manufacturing, in particular to a multipurpose high-viscosity repositionable glass film and a preparation method thereof. Background Along with the rapid development of the fields of architectural decoration, automobile interior decoration, commercial display and the like, the glass surface film is a common material with decorative, protective and functional properties, the market demand is continuously rising, and the application scene is gradually expanded from single glass protection to the multiple fields of personalized pattern decoration, privacy shielding, light adjustment and the like. Most of conventional glass films circulated in the market at present have the problems of insufficient performance suitability, high construction difficulty, poor reusability and the like, and are difficult to meet the market demands of current fine construction, multi-scene multiplexing and long-term stable use. The conventional film is mainly made of a common flexible film as a base material, the surface is not subjected to surface activation treatment, the surface layer is smooth, the surface tension is low, the binding force between the coating and the base material is weak when the coating is sprayed or coated and printed later, the problems of coating falling, peeling, pattern halation cracking and the like easily occur in the long-term use process, the appearance integrity and the service life of the film are directly affected, meanwhile, the high-precision ink-jet printing process cannot be adapted, high-definition and fine pattern printing is difficult to realize, and the application of the product in high-end decorative scenes is limited. In the aspect of adhesive layer design, the current glass pad pasting adopts continuous full-scale glue film structure more, glue film distribution uniformity is poor, when laminating glass surface, the air is difficult to discharge fast, very easily remain the bubble, need scrape the pressure adjustment repeatedly in the work progress, not only consuming time and consuming power, still easily lead to the film body fold because of scrape the pressure dynamics inequality, warp, in case the laminating dislocation, take off the very fragile glue film when lifting the subsides, lead to the viscidity suddenly to drop, can't realize smooth and easy re-subsides, partial pad pasting can remain a large amount of glues stain even on glass surface, the clearance degree of difficulty is very big, still can damage glass surface finish. Meanwhile, the adhesive layer used for conventional film sticking is mostly an oily adhesive, the environment friendliness is poor, harmful substances are easy to release in a high-temperature environment, the weather resistance is insufficient, the adhesive layer is influenced by illumination and temperature change for a long time, the adhesive layer is easy to age and yellow, the viscosity is gradually attenuated, the conditions of edge warping, film body falling and the like occur, the laminating stability of the surface of the adaptive glass is poor, and the long-term use requirements in different temperature and humidity environments cannot be adapted. From the aspect of production technology, in the existing film pasting production flow, the process parameters of the working procedures such as substrate pretreatment, coating, composite forming, curing and shaping are rough, the key working procedures such as corona treatment, coating drying, hot pressing compounding and the like lack of fine control, the problems of uneven film thickness, loose interlayer combination, poor dimensional stability and the like easily occur, the qualification rate of finished products after slitting is low, and the consistency of the performance of products produced in batches is difficult to guarantee. In addition, the release layer of conventional pad pasting is mostly planar structure, and the design of non-pointedly embosses, and easy and glue film adhesion when peeling off not only influences and peels off smooth and easy degree, can also destroy the original structure of glue film, further reduces the performance of re-pasting. At present, a multipurpose glass film which has high viscosity, can be repeatedly pasted, is easy to construct, has high-definition printing suitability and is environment-friendly and weather-resistant is lacking in the market, the corresponding systematic preparation process also has obvious short plates, the production stability and the comprehensive performance of products cannot be considered, and the application requirements of the glass film with diversified and high quality are difficult to match. Disclosure of Invention The invention aims to provide a multipurpose high-viscosity re-attachable glass film and a preparation method thereof, s