CN115339254B - Thermal transfer film for motor vehicle license plate and manufacturing method and application thereof - Google Patents

Thermal transfer film for motor vehicle license plate and manufacturing method and application thereof Download PDF

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Publication number
CN115339254B
CN115339254B CN202211051940.4A CN202211051940A CN115339254B CN 115339254 B CN115339254 B CN 115339254B CN 202211051940 A CN202211051940 A CN 202211051940A CN 115339254 B CN115339254 B CN 115339254B
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China
Prior art keywords
layer
thermal transfer
motor vehicle
vehicle license
license plate
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CN202211051940.4A
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CN115339254A (en
Inventor
郑小平
舒林飞
刘玫
王圣贤
胡锋
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Zhejiang Longyou Daoming Optics & Chemical Co ltd
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Zhejiang Longyou Daoming Optics & Chemical Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/38207—Contact thermal transfer or sublimation processes characterised by aspects not provided for in groups B41M5/385 - B41M5/395
    • B41M5/38214—Structural details, e.g. multilayer systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
    • B05D7/04—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber to surfaces of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/58—No clear coat specified
    • B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/26—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers modified by chemical after-treatment
    • C09J123/28—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers modified by chemical after-treatment by reaction with halogens or compounds containing halogen
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/255—Polyesters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • C09J7/401—Adhesives in the form of films or foils characterised by release liners characterised by the release coating composition
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2427/00—Presence of halogenated polymer
    • C09J2427/005—Presence of halogenated polymer in the release coating
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2433/00—Presence of (meth)acrylic polymer
    • C09J2433/005—Presence of (meth)acrylic polymer in the release coating
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Decoration By Transfer Pictures (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a thermal transfer film for a motor vehicle license plate and a manufacturing method and application thereof, and the thermal transfer film comprises a PET (polyethylene terephthalate) base film layer and a thermal transfer layer, wherein the PET base film layer is connected with the thermal transfer layer, the thermal transfer layer comprises a release layer, a color layer and a back adhesive layer which are sequentially connected, the release layer is prepared from thermoplastic acrylic resin A, polyethylene wax slurry, an ultraviolet absorbent and a light stabilizer, the color layer is prepared from toner, a vinyl chloride-vinyl acetate-vinyl alcohol terpolymer, a dispersing agent and acrylic resin B, and the back adhesive layer is prepared from chlorinated polypropylene resin, vinyl chloride-vinyl acetate resin, phenolic resin and silicon powder. Through the design, the heat transfer film can be subjected to low-temperature thermoprinting, the production efficiency is higher, the thermoprinting fastness is higher, the thermoprinting stability is higher, and the thermoprinting energy consumption is lower.

Description

Thermal transfer film for motor vehicle license plate and manufacturing method and application thereof
Technical Field
The invention relates to the technical field of hot stamping, in particular to a thermal transfer film for a motor vehicle license plate and a manufacturing method and application thereof.
Background
The domestic traditional motor vehicle license plate manufacturing process mainly comprises a screen printing process and a roller coating printing process, but the two processes have serious VOC emission problems in the process of license plate manufacturing, so that the health of operators is affected, and meanwhile, the production efficiency is low due to the defects of long ink drying time and the like.
In recent years, the finished product of the domestic new energy automobile license plate is manufactured by adopting a hot stamping film heat transfer printing process, the hot stamping film has no VOC emission in the heat transfer printing process, is environment-friendly, meets the environment-friendly requirement, has high safety, simultaneously avoids the defect of long ink drying time in the traditional roller coating process, effectively improves the production efficiency, and protects the health of operators. At present, the heat transfer printing technology is a mainstream production and manufacturing technology of motor vehicle license plates in the world, and has wide application in all parts of the world. From the perspective of environmental protection and comprehensive cost, the domestic traditional motor vehicle license plate processing technology is also changed from the screen printing and roller coating technology to the hot stamping film heat transfer technology in combination with the mainstream direction of foreign motor vehicle license plate production.
In the process of manufacturing the license plate by adopting the hot stamping film heat transfer technology at home and abroad, the problem that the traditional heat transfer film is poor in matching with the motor vehicle license plate, the requirements of hot stamping fastness and the like can be met only by heat transfer, and the problem that the hot stamping equipment is easy to age a rubber roller under high-temperature load for a long time, so that the hot stamping stability is reduced, the energy consumption of the equipment is too high and the like is solved, so that improvement is needed.
Disclosure of Invention
Aiming at the defects of difficult combination of thermoprinting fastness and thermoprinting stability and the like in the prior art, the invention provides a novel heat transfer film for a motor vehicle number plate, and a manufacturing method and application thereof.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the utility model provides a heat transfer printing film for motor vehicle license plate, includes PET base film layer, heat transfer printing layer, PET base film layer and heat transfer printing layer interconnect, the heat transfer printing layer is including the release layer, colour layer, the gum layer that connect gradually, from the type layer by mass portion ratio 20 ~ 30: 15-20: 0.5 to 2:0.1 to 0.5 of thermoplastic acrylic resin A, polyethylene wax slurry, an ultraviolet absorber and a light stabilizer, wherein the color layer is prepared from the following components in parts by weight: 50-70: 1-2: 10-30 parts of toner, a chloroethylene-vinyl acetate-vinyl alcohol terpolymer, a dispersing agent and an acrylic resin B, wherein the back adhesive layer is prepared from 6-12 parts by weight: 5 to 9: 5-10: 0.5 to 2 percent of chlorinated polypropylene resin, vinyl chloride-vinyl acetate resin, phenolic resin and silicon powder.
The PET base film layer is used as a carrier of the thermal transfer film and also plays a role in protecting the thermal transfer film in the production process. The thermal transfer layer is used as an information coating of the motor vehicle license plate, so that the motor vehicle license plate can adopt a thermal transfer process, the traditional screen printing process and the traditional ink printing process are replaced, no VOC is emitted, the environment friendliness is better, the safety is higher, the production efficiency is effectively improved, the health of operators is protected, the thermoprinting energy consumption is reduced, and the thermoprinting stability is improved. The release layer enables the thermal transfer layer to be separated from the PET base film layer, so that the transfer characteristic of the thermal transfer film is guaranteed, and the production efficiency is guaranteed. The color layer is used to implement a specified color. The back adhesive layer is used for being adhered with motor vehicle license plates made of different materials, so that the adhesion stability of the heat transfer film is ensured.
The thermoplastic acrylic resin A is used for improving the solvent resistance of the thermal transfer film, particularly improving the solvent resistance of alcohol, and simultaneously has the function of adjusting the release force of the release layer, so that the release layer has more stable release effect, and easy detachment or difficult release is avoided. The polyethylene wax slurry is used for being matched with the thermoplastic acrylic resin A, the release force of the release layer is adjusted, and meanwhile, the polyethylene wax slurry enables the scratch resistance of the release layer to be better. The ultraviolet absorber is used for improving the ageing resistance of the thermal transfer film, so that the service life of the thermal transfer film is prolonged. The light stabilizer is used for being matched with the ultraviolet absorber to capture free radicals generated after irradiation of solar light, so that the ageing resistance of the thermal transfer film is further improved. The weight portion ratio of the thermoplastic acrylic resin A to the polyethylene wax slurry to the ultraviolet absorber to the light stabilizer is 20-30: 15-20: 0.5 to 2:0.1 to 0.5, so that the release force of the release layer is more reasonable, and the thermal transfer film has better scratch resistance and outdoor ageing resistance, and has longer service life. The toner functions as a pigment. The vinyl chloride-vinyl acetate-vinyl alcohol terpolymer plays a role in wrapping the toner, and enables the color layer to have better solvent resistance to alcohol, so that the stability of the thermal transfer film is further improved. The dispersing agent is used for dispersing the toner, so that the color of the color layer is more uniform. The acrylic resin B is used for improving the shock resistance of the color layer and also improving the solvent resistance of the color layer. The mass portion ratio of the toner, the chloroethylene-vinyl acetate-vinyl alcohol terpolymer, the dispersing agent and the acrylic resin B is 5-15: 50-70: 1-2: 10 to 30, the color of the color layer is more uniform, the solvent resistance is better, the imprinting edge of the thermal transfer film in the transfer printing process of the motor vehicle license plate is more neat, and the trimming burrs are avoided. The chlorinated polypropylene resin is used for improving the adhesive force of the back adhesive layer to the surface of the motor vehicle license plate, guaranteeing the adhesive property with the surface of the motor vehicle license plate, thereby prolonging the service life of the heat transfer film, and simultaneously, the low-temperature thermoprint is realized due to the lower softening point of the chlorinated polypropylene resin, so that the thermoprint energy consumption is lower and the stability is higher. The vinyl chloride-vinyl acetate copolymer is used for being matched with chlorinated polypropylene resin, so that the softening point of the gum layer is further reduced, and the adhesive force and thermoprinting performance of the gum layer are also improved. The phenolic resin is used for improving the adhesive force of the back adhesive layer, so that the applicability of the thermal transfer film to different motor vehicle license plates is improved, and the adhesive fastness is ensured. The silica flour makes the gum layer surface be frosted, has improved the exhaust performance when the thermal transfer film rolling, in addition because the softening point of gum layer is lower, the silica flour has improved the anti-back tack of gum layer to the thermal transfer film quality has been ensured. The mass portion ratio of the chlorinated polypropylene resin to the vinyl chloride-vinyl acetate copolymer resin to the phenolic resin to the silicon powder is 6-12: 5 to 9: 5-10: 0.5-2, the softening point of the back adhesive layer is more suitable, low-temperature thermoprinting is realized, the adhesive force of different motor vehicle license plates is also ensured, in addition, the heat transfer film is not reversely adhered when being rolled, and the performance is more stable.
Through the design, the heat transfer film can be subjected to low-temperature thermoprinting, the production efficiency is higher, the thermoprinting fastness is higher, the thermoprinting stability is higher, and the thermoprinting energy consumption is lower.
Preferably, in the thermal transfer film for a motor vehicle license plate, the total thickness of the PET base film layer and the thermal transfer layer is 19 μm to 33 μm, the thickness of the PET base film layer is 15 μm to 25 μm, the thickness of the release layer is 1 μm to 2 μm, the thickness of the color layer is 1.5 μm to 3 μm, and the thickness of the back adhesive layer is 1.5 μm to 3 μm.
The thickness of the PET base film layer is 15-25 mu m, so that the defect of insufficient heat resistance caused by the fact that the PET base film layer is too thin is avoided, poor heat transfer is further caused, and the problem that the heat transfer is slow and the influence on the thermoprinting temperature and the flexibility of the heat transfer film is also avoided. The thickness of the release layer is 1-2 mu m, so that the problem that the release layer is too thin to cause heavy stripping force, thereby causing incomplete transfer printing and low solvent resistance of the thermal transfer film is avoided, and the problem that the thermal transfer layer is easy to fall off due to too light stripping force caused by too thick release layer is also avoided. The thickness of the color layer is 1.5-3 mu m, so that the defects of insufficient covering power, easy penetration bottom, poor solvent resistance and poor impact resistance caused by too thin color layer are avoided, excessive heat absorption caused by too thick color layer is also avoided, high hot stamping temperature is caused, and burrs are easy to exist on the edge cutting of the marks after thermal transfer printing. The thickness of the back adhesive layer is 1.5-3 mu m, so that the problem that the adhesive force is low due to the fact that the back adhesive layer is too thin is avoided, and the problem that burrs are easy to occur on the edge cutting of the marks after thermal transfer printing due to the fact that the back adhesive layer is too thick is also avoided. The design further ensures the quality stability of the thermal transfer layer.
Preferably, in the heat transfer film for a motor vehicle license plate, the glass transition temperature of the thermoplastic acrylic resin A in the release layer is 90-120 ℃, the weight average molecular weight is 5000-80000, the softening point is 150-180 ℃, and the average particle diameter of the polyethylene wax powder in the polyethylene wax slurry is 1-2 μm.
The glass transition temperature of the thermoplastic acrylic resin A is 90-120 ℃, so that the release layer has better solvent resistance, especially alcohol and gasoline resistance, and simultaneously the anti-adhesion property of the release layer is ensured. The weight average molecular weight is 5000-80000, the softening point is 150-180 ℃, the solvent resistance of the release layer is further ensured, the weight average molecular weight influences the flexibility and slitting property of the release layer, the brittleness is increased to be small, the slitting is facilitated, the solvent resistance is not facilitated, and the solvent resistance is greatly facilitated, but the problem of edge cutting burrs is caused. The average grain diameter of the polyethylene wax powder in the polyethylene wax slurry is 1-2 mu m, so that the release layer is smoother and more compact, and the impact resistance and solvent resistance are improved.
Preferably, in the above-mentioned heat transfer film for a motor vehicle license plate, the glass transition temperature of the vinyl chloride-vinyl acetate-vinyl alcohol terpolymer in the color layer is 60 to 80 ℃, the hydroxyl value of the hydroxyl functional group of the vinyl chloride-vinyl acetate-vinyl alcohol terpolymer is 70 to 80mgKOH/g, and the glass transition temperature of the acrylic resin B is 100 to 120 ℃.
The glass transition temperature of the vinyl chloride-vinyl acetate-vinyl alcohol terpolymer is 60-80 ℃, so that the hardness of the color layer is more suitable, and the slitting performance of the thermal transfer film after thermal transfer is ensured. The hydroxyl value is 70 mgKOH/g-80 mgKOH/g, and the wetting effect is better, so that the dispersion of the toner is better, and the toner has better solvent resistance. The vitrification temperature of the acrylic resin B is 100-120 ℃, the rigidity of the color layer is ensured, the trimming of the edge of the mark after the thermal transfer printing is more beneficial to be tidy, and the burr problem is avoided.
Preferably, in the heat transfer film for a motor vehicle license plate, the chlorinated polypropylene resin in the back adhesive layer is low chlorinated polypropylene, the chlorine content of the low chlorinated polypropylene is less than 30%, and the softening point is 55-85 ℃.
The low chlorinated polypropylene has higher solvent resistance of the back adhesive layer and higher adhesive force to different motor vehicle license plates. The chlorine content of the low chlorinated polypropylene is less than 30 percent, so that the compatibility and the adhesive force of the low chlorinated polypropylene are both considered. The softening point is 55-85 ℃, and the back adhesive layer is prevented from being too soft and then reversely stuck when being rolled due to the too low softening point due to low temperature hot stamping.
Preferably, in the heat transfer film for a motor vehicle license plate, the phenolic resin in the back adhesive layer is a modified phenolic novolac resin, the softening point of the modified phenolic novolac resin is 130-160 ℃, and the acid value of the modified phenolic novolac resin is 50-70 mgKOH/g.
The softening point of the modified linear phenolic resin is 130-160 ℃, so that the anti-reverse adhesion and low-temperature hot stamping are ensured. The acid value is 50 mgKOH/g-70 mgKOH/g, so that the polarity of the phenolic resin is higher, thereby improving the adhesive force.
Preferably, in the above-mentioned heat transfer film for a motor vehicle license plate, the particle diameter of the silica powder in the back adhesive layer is 2 μm to 4 μm, and the silica powder is subjected to surface treatment.
The grain diameter of the silica powder is 2-4 mu m, so that the back adhesive layer has frosted surface, the air is more easily discharged during rolling, and the anti-back adhesion property is improved. The fluidity of the silicon powder after surface treatment is better, which is more beneficial to production and processing.
Preferably, the method for manufacturing the heat transfer film for the motor vehicle license plate comprises the following steps:
s1: dissolving thermoplastic acrylic resin A, polyethylene wax slurry, an ultraviolet absorber and a light stabilizer by using a ketone or ester solvent, mixing the thermoplastic acrylic resin A with the polyethylene wax slurry, the ultraviolet absorber and the light stabilizer, and uniformly dispersing the mixture to obtain a mixed solution A, taking a PET base film layer, coating the mixed solution A on one side of the PET base film layer, and then drying at 100-130 ℃ to obtain a release layer;
s2: uniformly mixing toner, a vinyl chloride-vinyl acetate-vinyl alcohol terpolymer, a dispersing agent and acrylic resin B to obtain a mixed solution B, putting the mixed solution B into a grinder, grinding for 4-6 hours by using zirconium beads with the diameter of 0.5-0.6 mm to ensure that the average particle size of the mixed solution B reaches 0.5-1 mu m, uniformly coating the mixed solution B on the surface of the release layer, and finally drying at 100-130 ℃ to obtain a color layer;
s3: dissolving chlorinated polypropylene resin, vinyl chloride-vinyl acetate copolymer, phenolic resin and silicon powder in a benzene and ester mixed solvent, uniformly dispersing to obtain a mixed solution C, uniformly coating the mixed solution C on the surface of the color layer, and then drying at 100-130 ℃ to obtain a back adhesive layer, wherein the release layer, the color layer and the back adhesive layer are used as heat transfer layers to obtain the heat transfer film for the motor vehicle license plate.
And the step S1 is used for manufacturing the release layer, drying is guaranteed to be complete by drying at 100-130 ℃, the content of residual solvent is reduced, and the quality of the thermal transfer film is guaranteed. The step S2 is used for manufacturing the color layer, the average grain diameter reaches 0.5-1 mu m, and the ground mixed solution B is finer and more uniform, so that the effect after thermal transfer printing is finer and more uniform. Step S3 is for manufacturing a backsize layer.
The use of a heat transfer film for motor vehicle license plates according to any one of claims 1 to 7, wherein the heat transfer film for motor vehicle license plates is applied to heat transfer production of motor vehicle license plates at 180 ℃.
The low-temperature thermoprinting has lower energy consumption and longer service life of equipment and consumable materials.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is described in further detail below in connection with fig. 1 and the detailed description, but they are not limiting to the invention:
example 1
The utility model provides a heat transfer printing film for motor vehicle license plate, includes PET base film layer 1, heat transfer printing layer 2, PET base film layer 1 and heat transfer printing layer 2 interconnect, heat transfer printing layer 2 is including from type layer 21, colour layer 22, the gum layer 23 that connect gradually, from type layer 21 by mass portion ratio 20:15:0.5:0.1 of thermoplastic acrylic resin A, polyethylene wax slurry, an ultraviolet absorber and a light stabilizer, wherein the color layer 22 is prepared from the following components in parts by weight: 50:1:10, a vinyl chloride-vinyl acetate-vinyl alcohol terpolymer, a dispersing agent and an acrylic resin B, wherein the back adhesive layer 23 is prepared from the following components in parts by weight: 5:5:0.5 of chlorinated polypropylene resin, vinyl chloride-vinyl acetate resin, phenolic resin and silicon powder.
Preferably, the total thickness of the PET base film layer 1 and the thermal transfer layer 2 is 19 μm, the thickness of the PET base film layer 1 is 15 μm, the thickness of the release layer 21 is 1 μm, the thickness of the color layer 22 is 1.5 μm, and the thickness of the backing adhesive layer 23 is 1.5 μm.
Preferably, in the release layer 21, the thermoplastic acrylic resin A has a glass transition temperature of 90 ℃, a weight average molecular weight of 5000, a softening point of 150 ℃, and an average particle diameter of the polyethylene wax powder in the polyethylene wax slurry of 1 μm.
Preferably, in the color layer 22, the glass transition temperature of the vinyl chloride-vinyl acetate-vinyl alcohol terpolymer is 60 ℃, the hydroxyl value of the hydroxyl functional group of the vinyl chloride-vinyl acetate-vinyl alcohol terpolymer is 70mgKOH/g, and the glass transition temperature of the acrylic resin B is 100 ℃.
Preferably, in the backing adhesive layer 23, the chlorinated polypropylene resin is low chlorinated polypropylene, the chlorine content of the low chlorinated polypropylene is less than 30%, and the softening point is 55 ℃.
Preferably, in the back adhesive layer 23, the phenolic resin is a modified phenolic novolac resin having a softening point of 130 ℃ and an acid value of 50mgKOH/g.
Preferably, in the back adhesive layer 23, the grain size of the silicon powder is 2 μm and the silicon powder is surface-treated.
Preferably, the method comprises the following steps:
s1: dissolving thermoplastic acrylic resin A, polyethylene wax slurry, an ultraviolet absorber and a light stabilizer by using a ketone or ester solvent, mixing the thermoplastic acrylic resin A with the polyethylene wax slurry, the ultraviolet absorber and the light stabilizer, and uniformly dispersing the mixture to obtain a mixed solution A, taking a PET base film layer 1, coating the mixed solution A on one side of the PET base film layer 1, and then drying at 100 ℃ to obtain a release layer 21;
s2: mixing toner, a vinyl chloride-vinyl acetate-vinyl alcohol terpolymer, a dispersing agent and acrylic resin B uniformly to obtain a mixed solution B, putting the mixed solution B into a grinder, grinding for 4 hours by using 0.5mm zirconium beads to ensure that the average particle size of the mixed solution B reaches 0.5 mu m, uniformly coating the mixed solution B on the surface of the release layer 21, and finally drying at 100 ℃ to obtain a color layer 22;
s3: dissolving chlorinated polypropylene resin, vinyl chloride-vinyl acetate copolymer, phenolic resin and silicon powder in a benzene and ester mixed solvent, uniformly dispersing to obtain a mixed solution C, uniformly coating the mixed solution C on the surface of the color layer 22, and then drying at 100 ℃ to obtain a back adhesive layer 23, wherein the release layer 21, the color layer 22 and the back adhesive layer 23 serve as a thermal transfer layer 2 to obtain the thermal transfer film for the motor vehicle license plate.
Preferably, the thermal transfer film for the motor vehicle license plate is applied to thermal transfer manufacture of the motor vehicle license plate at 180 ℃ or below.
Example 2
The utility model provides a heat transfer printing film for motor vehicle license plate, includes PET base film layer 1, heat transfer printing layer 2, PET base film layer 1 and heat transfer printing layer 2 interconnect, heat transfer printing layer 2 is including from type layer 21, colour layer 22, the gum layer 23 that connect gradually, from type layer 21 by mass portion ratio for 30:20:2:0.5 of thermoplastic acrylic resin A, polyethylene wax slurry, an ultraviolet absorber and a light stabilizer, wherein the color layer 22 is prepared from the following components in parts by weight: 70:2:30, a vinyl chloride-vinyl acetate-vinyl alcohol terpolymer, a dispersing agent and an acrylic resin B, wherein the back adhesive layer 23 is prepared from the following components in parts by weight: 9:10:2, chlorinated polypropylene resin, vinyl chloride-vinyl acetate resin, phenolic resin and silica powder.
Preferably, the total thickness of the PET base film layer 1 and the thermal transfer layer 2 is 33 μm, the thickness of the PET base film layer 1 is 25 μm, the thickness of the release layer 21 is 2 μm, the thickness of the color layer 22 is 3 μm, and the thickness of the backing adhesive layer 23 is 3 μm.
Preferably, in the release layer 21, the thermoplastic acrylic resin a has a glass transition temperature of 120 ℃, a weight average molecular weight of 80000, a softening point of 180 ℃, and an average particle diameter of the polyethylene wax powder in the polyethylene wax slurry of 2 μm.
Preferably, in the color layer 22, the glass transition temperature of the vinyl chloride-vinyl acetate-vinyl alcohol terpolymer is 80 ℃, the hydroxyl value of the hydroxyl functional group of the vinyl chloride-vinyl acetate-vinyl alcohol terpolymer is 80mgKOH/g, and the glass transition temperature of the acrylic resin B is 120 ℃.
Preferably, in the backing adhesive layer 23, the chlorinated polypropylene resin is low chlorinated polypropylene, the chlorine content of the low chlorinated polypropylene is less than 30%, and the softening point is 85 ℃.
Preferably, in the back adhesive layer 23, the phenolic resin is a modified phenolic novolac resin having a softening point of 160 ℃ and an acid value of 70mgKOH/g.
Preferably, in the back adhesive layer 23, the grain size of the silicon powder is 4 μm and the silicon powder is surface-treated.
Preferably, the method comprises the following steps:
s1: dissolving thermoplastic acrylic resin A, polyethylene wax slurry, an ultraviolet absorber and a light stabilizer by using a ketone or ester solvent, mixing the thermoplastic acrylic resin A with the polyethylene wax slurry, the ultraviolet absorber and the light stabilizer, and uniformly dispersing the mixture to obtain a mixed solution A, taking a PET base film layer 1, coating the mixed solution A on one side of the PET base film layer 1, and then drying at 130 ℃ to obtain a release layer 21;
s2: mixing toner, a vinyl chloride-vinyl acetate-vinyl alcohol terpolymer, a dispersing agent and acrylic resin B uniformly to obtain a mixed solution B, putting the mixed solution B into a grinder, grinding for 6 hours by using 0.6mm zirconium beads to ensure that the average particle size of the mixed solution B reaches 1 mu m, uniformly coating the mixed solution B on the surface of the release layer 21, and finally drying at 130 ℃ to obtain a color layer 22;
s3: dissolving chlorinated polypropylene resin, vinyl chloride-vinyl acetate copolymer, phenolic resin and silicon powder in a benzene and ester mixed solvent, uniformly dispersing to obtain a mixed solution C, uniformly coating the mixed solution C on the surface of the color layer 22, and then drying at 130 ℃ to obtain a back adhesive layer 23, wherein the release layer 21, the color layer 22 and the back adhesive layer 23 serve as a thermal transfer layer 2 to obtain the thermal transfer film for the motor vehicle license plate.
Preferably, the thermal transfer film for the motor vehicle license plate is applied to thermal transfer manufacture of the motor vehicle license plate at 180 ℃ or below.
Example 3
The utility model provides a heat transfer printing film for motor vehicle license plate, includes PET base film layer 1, heat transfer printing layer 2, PET base film layer 1 and heat transfer printing layer 2 interconnect, heat transfer printing layer 2 is including from type layer 21, colour layer 22, the gum layer 23 that connect gradually, from type layer 21 by mass portion ratio 25:17.5:1.25:0.3 of thermoplastic acrylic resin A, polyethylene wax slurry, an ultraviolet absorber and a light stabilizer, wherein the color layer 22 is prepared from the following components in parts by weight: 60:1.5:20, a vinyl chloride-vinyl acetate-vinyl alcohol terpolymer, a dispersing agent and an acrylic resin B, wherein the back adhesive layer 23 is prepared from the following components in parts by weight: 7:7.25:1.25 of chlorinated polypropylene resin, vinyl chloride-vinyl acetate resin, phenolic resin and silicon powder.
Preferably, the total thickness of the PET base film layer 1 and the thermal transfer layer 2 is 26 μm, the thickness of the PET base film layer 1 is 20 μm, the thickness of the release layer 21 is 1.5 μm, the thickness of the color layer 22 is 2.25 μm, and the thickness of the backing adhesive layer 23 is 2.25 μm.
Preferably, in the release layer 21, the thermoplastic acrylic resin a has a glass transition temperature of 105 ℃, a weight average molecular weight of 42500, a softening point of 165 ℃, and an average particle diameter of the polyethylene wax powder in the polyethylene wax slurry of 1.5 μm.
Preferably, in the color layer 22, the glass transition temperature of the vinyl chloride-vinyl acetate-vinyl alcohol terpolymer is 70 ℃, the hydroxyl value of the hydroxyl functional group of the vinyl chloride-vinyl acetate-vinyl alcohol terpolymer is 75mgKOH/g, and the glass transition temperature of the acrylic resin B is 110 ℃.
Preferably, in the backing adhesive layer 23, the chlorinated polypropylene resin is low chlorinated polypropylene, the chlorine content of the low chlorinated polypropylene is less than 30%, and the softening point is 70 ℃.
Preferably, in the back adhesive layer 23, the phenolic resin is a modified phenolic novolac resin having a softening point of 145 ℃ and an acid value of 60mgKOH/g.
Preferably, in the back adhesive layer 23, the grain size of the silicon powder is 3 μm and the silicon powder is surface-treated.
Preferably, the method comprises the following steps:
s1: dissolving thermoplastic acrylic resin A, polyethylene wax slurry, an ultraviolet absorber and a light stabilizer by using a ketone or ester solvent, mixing the thermoplastic acrylic resin A with the polyethylene wax slurry, the ultraviolet absorber and the light stabilizer, and uniformly dispersing the mixture to obtain a mixed solution A, taking a PET base film layer 1, coating the mixed solution A on one side of the PET base film layer 1, and then drying the coated PET base film layer 1 at 115 ℃ to obtain a release layer 21;
s2: mixing toner, a vinyl chloride-vinyl acetate-vinyl alcohol terpolymer, a dispersing agent and acrylic resin B uniformly to obtain a mixed solution B, putting the mixed solution B into a grinder, grinding for 5 hours by using 0.55mm zirconium beads to ensure that the average particle size of the mixed solution B reaches 0.75 mu m, uniformly coating the mixed solution B on the surface of the release layer 21, and finally drying at 115 ℃ to obtain a color layer 22;
s3: dissolving chlorinated polypropylene resin, vinyl chloride-vinyl acetate copolymer, phenolic resin and silicon powder in a benzene and ester mixed solvent, uniformly dispersing to obtain a mixed solution C, uniformly coating the mixed solution C on the surface of the color layer 22, and then drying at 115 ℃ to obtain a back adhesive layer 23, wherein the release layer 21, the color layer 22 and the back adhesive layer 23 serve as a thermal transfer film 2, so as to obtain the thermal transfer film for the motor vehicle license plate.
Preferably, the thermal transfer film for the motor vehicle license plate is applied to thermal transfer manufacture of the motor vehicle license plate at 180 ℃ or below.
Example 4
The thermal transfer films for the motor vehicle license plates obtained in the above embodiments are taken, the existing thermal transfer films of model NC00K01 of Enxi love film Co., ltd are taken as comparative examples, and thermal transfer tests at different temperatures are carried out according to GA/T1083-2013 thermoprint films for motor vehicle license plates.
The thermal transfer films for motor vehicle license plates obtained in the examples of the present invention and the comparative examples have the performance parameters shown in table 1;
TABLE 1
Note that: evaluation criteria: excellent, good, delta local defect, x failed.
The above test was carried out using an HP WG 106 roller hot stamping heat transfer machine sold by WILHELM GREWE OHG, germany, with a hot stamping speed of 3m/min.
The motor vehicle license plate is a semi-finished product formed by laminating and stamping a DM8200 series license plate grade reflecting film sold by daoming optical limited company and an aluminum plate.
In summary, the foregoing description is only of the preferred embodiments of the present invention, and all equivalent changes and modifications that come within the scope of the present invention are desired to be covered thereby.

Claims (7)

1. A thermal transfer film for a motor vehicle license plate, characterized in that: including PET base film layer (1), heat transfer layer (2), PET base film layer (1) and heat transfer layer (2) interconnect, heat transfer layer (2) are including from type layer (21), colour layer (22), gum layer (23) that connect gradually, from type layer (21) by mass portion ratio 20 ~ 30: 15-20: 0.5 to 2:0.1 to 0.5 of thermoplastic acrylic resin A, polyethylene wax slurry, an ultraviolet absorber and a light stabilizer, wherein the color layer (22) is prepared from the following components in parts by weight: 50-70: 1-2: 10-30 parts of toner, a chloroethylene-vinyl acetate-vinyl alcohol terpolymer, a dispersing agent and acrylic resin B, wherein the back adhesive layer (23) is prepared from 6-12 parts by weight: 5 to 9: 5-10: 0.5-2 of chlorinated polypropylene resin, vinyl chloride-vinyl acetate copolymer, phenolic resin and silicon powder, wherein the total thickness of the PET base film layer (1) and the thermal transfer layer (2) is 19-33 mu m, the thickness of the PET base film layer (1) is 15-25 mu m, the thickness of the release layer (21) is 1-2 mu m, the thickness of the color layer (22) is 1.5-3 mu m, the thickness of the back adhesive layer (23) is 1.5-3 mu m, and the manufacturing method comprises the following steps:
s1: taking thermoplastic acrylic resin A, polyethylene wax slurry, an ultraviolet absorber and a light stabilizer, dissolving the thermoplastic acrylic resin A by using a ketone or ester solvent, mixing the thermoplastic acrylic resin A with the polyethylene wax slurry, the ultraviolet absorber and the light stabilizer, uniformly dispersing the mixture to obtain a mixed solution A, taking a PET base film layer (1), coating the mixed solution A on one side of the PET base film layer (1), and then drying the PET base film layer at 100-130 ℃ to obtain a release layer (21);
s2: mixing toner, a vinyl chloride-vinyl acetate-vinyl alcohol terpolymer, a dispersing agent and acrylic resin B uniformly to obtain a mixed solution B, putting the mixed solution B into a grinder, grinding for 4-6 hours by using zirconium beads with the diameter of 0.5-0.6 mm to ensure that the average particle size of the mixed solution B reaches 0.5-1 mu m, uniformly coating the mixed solution B on the surface of the release layer (21), and finally drying at the temperature of 100-130 ℃ to obtain a color layer (22);
s3: and dissolving chlorinated polypropylene resin, vinyl chloride-vinyl acetate copolymer, phenolic resin and silicon powder in a benzene and ester mixed solvent, uniformly dispersing to obtain a mixed solution C, uniformly coating the mixed solution C on the surface of the color layer (22), and then drying at 100-130 ℃ to obtain a back adhesive layer (23), wherein the release layer (21), the color layer (22) and the back adhesive layer (23) are used as a thermal transfer layer (2) to obtain the thermal transfer film for the motor vehicle license plate.
2. A thermal transfer film for a motor vehicle license plate as recited in claim 1, wherein: in the release layer (21), the glass transition temperature of the thermoplastic acrylic resin A is 90-120 ℃, the weight average molecular weight is 5000-80000, the softening point is 150-180 ℃, and the average grain diameter of the polyethylene wax powder in the polyethylene wax slurry is 1-2 mu m.
3. A thermal transfer film for a motor vehicle license plate as recited in claim 1, wherein: in the color layer (22), the glass transition temperature of the vinyl chloride-vinyl acetate-vinyl alcohol terpolymer is 60-80 ℃, the hydroxyl value of the hydroxyl functional group of the vinyl chloride-vinyl acetate-vinyl alcohol terpolymer is 70-80 mgKOH/g, and the glass transition temperature of the acrylic resin B is 100-120 ℃.
4. A thermal transfer film for a motor vehicle license plate as recited in claim 1, wherein: in the back adhesive layer (23), the chlorinated polypropylene resin is low chlorinated polypropylene, the chlorine content of the low chlorinated polypropylene is less than 30%, and the softening point is 55-85 ℃.
5. A thermal transfer film for a motor vehicle license plate as recited in claim 1, wherein: in the back adhesive layer (23), the phenolic resin is modified linear phenolic resin, the softening point of the modified linear phenolic resin is 130-160 ℃, and the acid value is 50-70 mgKOH/g.
6. A thermal transfer film for a motor vehicle license plate as recited in claim 1, wherein: in the back adhesive layer (23), the grain diameter of the silicon powder is 2-4 mu m, and the silicon powder is subjected to surface treatment.
7. Use of a heat transfer film for motor vehicle license plates according to any one of claims 1 to 6, characterized in that: the thermal transfer film for the motor vehicle license plate is applied to the thermal transfer manufacture of the motor vehicle license plate below 180 ℃.
CN202211051940.4A 2022-08-31 2022-08-31 Thermal transfer film for motor vehicle license plate and manufacturing method and application thereof Active CN115339254B (en)

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