CN111218156A - Ink for thermal transfer ribbon, preparation method of ink, thermal transfer ribbon and thermal transfer printer - Google Patents
Ink for thermal transfer ribbon, preparation method of ink, thermal transfer ribbon and thermal transfer printer Download PDFInfo
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- CN111218156A CN111218156A CN202010102905.5A CN202010102905A CN111218156A CN 111218156 A CN111218156 A CN 111218156A CN 202010102905 A CN202010102905 A CN 202010102905A CN 111218156 A CN111218156 A CN 111218156A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
- C09D11/104—Polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/325—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads by selective transfer of ink from ink carrier, e.g. from ink ribbon or sheet
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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
- B41M5/40—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
- B41M5/41—Base layers supports or substrates
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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
- B41M5/40—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
- B41M5/423—Intermediate, backcoat, or covering layers characterised by non-macromolecular compounds, e.g. waxes
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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
- B41M5/40—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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
Abstract
The invention provides ink for a thermal transfer ribbon, a preparation method of the ink, the thermal transfer ribbon and a thermal transfer printer, and relates to the technical field of thermal transfer. The printing ink for the thermal transfer ribbon comprises raw materials such as saturated polyester resin and plasticizer, the plasticizer of a specific type acts on the saturated polyester resin in the printing ink for the thermal transfer ribbon, the flowability of the saturated polyester resin in a heating state can be effectively increased, the free volume of the saturated polyester resin is increased, the integral softening point is reduced, meanwhile, the breaking strength of the saturated polyester resin is reduced, a good plasticizing effect is achieved on the saturated polyester resin, the transfer temperature of the saturated polyester resin in the printing ink for the thermal transfer ribbon is reduced, the thermal transfer ribbon prepared from the printing ink for the thermal transfer ribbon is high in adaptation speed, the printing quality is clear, the good scratch resistance is achieved, and the printing effect on various media is good. The invention also provides a thermal transfer ribbon which comprises an ink layer prepared from the ink for the thermal transfer ribbon.
Description
Technical Field
The invention relates to the technical field of thermal transfer printing, in particular to ink for a thermal transfer ribbon, a preparation method of the ink, the thermal transfer ribbon and a thermal transfer printer.
Background
The Thermal Transfer ribbon is an intelligent printing ribbon for a Thermal Transfer over printer (TTO). Compare with traditional code printing carbon ribbon, the printing of date, digit, two-dimensional code, bar code and pattern etc. can be printed to the heat-transfer seal carbon ribbon, and the biggest characteristics are that print speed is fast, and printing efficiency is high, can realize online information change and online printing production, and the printing consumables is with low costs, need not pass through the label, can directly print on the packing. The printing method is widely applied to on-line generated information printing in various packaging industries, and the printed media comprise various media in the packaging industries, such as paper, fabrics, polypropylene, polyvinyl chloride, polyethylene terephthalate, biaxially oriented polypropylene films or o-phenylphenol. Printing on the packaging in real time enables the manufacturer to track the product as needed and maintain the product at the after-market stage, and the coding technology has become an important component of modern quality systems.
TTO has a large difference from the common flat bar code, the most significant of which is that TTO provides a much greater instantaneous pressure than the bar code, while it provides a much lower instantaneous heat than the bar code. Generally, the choice of ink in the ink layer in the thermal transfer ribbon is important to achieve high quality printing under fast, low heat conditions. In the conventional method, a resin material with stronger polarity and lower melting point and Tg value is generally selected as an ink layer binder, but when the resin with too low Tg value is selected, a carbon ribbon coating is sticky, the heat resistance is poor, and when the Tg value is too high, the transfer performance is reduced, so that the ink operation difficulty is higher, the adaptive window is small, and the process requirement is high.
In view of the above, the present application is particularly proposed to solve at least one of the above technical problems.
Disclosure of Invention
The first purpose of the invention is to provide the ink for the thermal transfer ribbon, and through the matching of the raw materials, the thermal transfer ribbon prepared from the ink for the thermal transfer ribbon has the advantages of high adaptation speed, clear printing quality, excellent scratch resistance and good printing effect on various media.
The second purpose of the invention is to provide a preparation method of the ink for the thermal transfer ribbon.
The third purpose of the invention is to provide a thermal transfer ribbon, which comprises an ink layer prepared by adopting the ink for the thermal transfer ribbon.
A fourth object of the present invention is to provide a thermal transfer printer including the ink layer made of the ink for thermal transfer ribbon or the thermal transfer ribbon.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention provides ink for a thermal transfer ribbon, which comprises the following raw materials in parts by weight:
20-40 parts of saturated polyester resin and 15-25 parts of plasticizer;
wherein the plasticizer comprises a phthalate plasticizer.
Further, on the basis of the above technical solution of the present invention, the phthalate plasticizer includes any one of or a combination of at least two of dicyclohexyl phthalate, dicyclohexyl terephthalate, or diisooctyl phthalate, and preferably includes dicyclohexyl phthalate.
Further, on the basis of the technical scheme of the invention, the raw materials of the ink also comprise 10-20 parts by weight of wax;
the raw materials of the ink also comprise 20-40 parts by weight of pigment;
preferably, the raw materials of the ink also comprise a dispersant, and the weight part of the dispersant is 1-3 parts.
Further, on the basis of the technical scheme of the invention, the ink comprises the following raw materials in parts by weight:
22-38 parts of saturated polyester resin, 16-24 parts of plasticizer, 11-19 parts of wax, 22-38 parts of pigment and 1.2-2.8 parts of dispersant;
preferably, the ink comprises the following raw materials in parts by weight:
24-36 parts of saturated polyester resin, 18-23 parts of plasticizer, 12-18 parts of wax, 23-36 parts of pigment and 1.4-2.6 parts of dispersant.
Further, on the basis of the above technical scheme of the present invention, the saturated polyester resin comprises a low molecular weight saturated polyester resin and a high molecular weight saturated polyester resin;
preferably, the weight ratio of the low molecular weight saturated polyester resin to the high molecular weight saturated polyester resin in the saturated polyester resin is (5-6.5): (3.5-5);
preferably, the low molecular weight saturated polyester resin has a number average molecular weight of 1000 to 7000 and a Tg value of 30 to 55 ℃ as measured by DSC;
preferably, the low molecular weight saturated polyester resin includes any one of or a combination of at least two of japan ewnigaco UE3320, japan ewnico UE3350, or japan ewnico UE9820, preferably the low molecular weight saturated polyester resin is japanese ewnico UE 3320;
preferably, the number average molecular weight of the high molecular weight saturated polyester resin is 10000-30000, and the Tg value measured by a DSC method is-30-10 ℃;
preferably, the trade name of the high molecular weight saturated polyester resin includes any one or a combination of at least two of japan eastern ocean spinning GK570, japan eastern ocean spinning 550, japan eastern ocean spinning 560, japan eastern ocean spinning 630, japan ewnigkok UE3530, japan ewnigkok UE3400, or japan ewnigkok UE3410, preferably japan eastern ocean spinning GK 570.
Further, on the basis of the technical scheme of the invention, the wax comprises any one of carnauba wax, candelilla wax, rice bran wax, montan wax, Fischer-Tropsch wax or PE wax or the combination of at least two of the carnauba wax, candelilla wax, rice bran wax, montan wax, Fischer-Tropsch wax and PE wax;
preferably, the pigment comprises an organic pigment and/or an inorganic pigment, preferably an inorganic pigment, further preferably carbon black;
preferably, the grade of the dispersant comprises any one of Luborun S5000, Luborun S17000 or Luborun S24000 or a combination of at least two of the above.
The invention also provides a preparation method of the ink for the thermal transfer ribbon, which comprises the following steps:
the saturated polyester resin, the plasticizer, the optional wax, the optional pigment, the optional dispersant and the solvent are mixed to obtain the ink for the thermal transfer ribbon.
The invention also provides a thermal transfer ribbon which comprises an ink layer, wherein the ink layer is prepared from the ink for the thermal transfer ribbon;
preferably, the thermal transfer ribbon further comprises a back coating layer, a substrate and a bottom coating layer, wherein the back coating layer is arranged on one surface of the substrate, the bottom coating layer and the ink layer are arranged on the other surface of the substrate, and the bottom coating layer is arranged between the ink layer and the substrate.
Further, on the basis of the technical scheme of the invention, the base coat is made of a base coat material, and the base coat material comprises the following raw materials in parts by weight: 80-90 parts of wax and 10-20 parts of resin;
preferably, the wax in the priming material comprises any one of or a combination of at least two of palm wax, candelilla wax or paraffin wax;
preferably, the resin comprises any one of acrylic resin, epoxy resin or EVA resin or a combination of at least two of the acrylic resin, the epoxy resin or the EVA resin;
preferably, the substrate comprises a PET polyester film;
preferably, the back coating comprises a silicone modified polyacrylate back coating.
The invention also provides a thermal transfer printer which comprises an ink layer or a thermal transfer ribbon made of the ink for the thermal transfer ribbon.
Compared with the prior art, the ink for the thermal transfer ribbon, the preparation method of the ink, the thermal transfer ribbon and the thermal transfer printer provided by the invention have the following technical effects:
(1) the invention provides ink for a thermal transfer ribbon, which comprises raw materials such as saturated polyester resin, plasticizer and the like, the printing ink for the thermal transfer ribbon can effectively increase the fluidity of the saturated polyester resin in a heating state, increase the free volume of the saturated polyester resin, reduce the integral softening point and simultaneously reduce the breaking strength of the saturated polyester resin through the action of the specific plasticizer and the saturated polyester resin, plays a good role in plasticizing saturated polyester resin, reduces the transfer temperature of the saturated polyester resin in the ink for the thermal transfer ribbon, so that the thermal transfer ribbon prepared by the ink for the thermal transfer ribbon has high adaptation speed, clear printing quality and excellent scratch resistance, the printing effect on various media is good, the temperature range suitable for transfer printing is large, and a suitable window can be found within the range of 80-140 energy levels within the range of normal printing speed.
(2) The invention provides a preparation method of ink for a thermal transfer ribbon, which is simple to operate, stable in process and suitable for industrial mass production.
(3) The invention provides a thermal transfer ribbon which comprises an ink layer, wherein the ink layer is prepared from the ink for the thermal transfer ribbon. In view of the advantages of the ink for the thermal transfer ribbon, the thermal transfer ribbon has the advantages of high adaptation speed, clear printing quality, excellent scratch resistance, good printing effect on various media and large temperature range suitable for transfer printing.
(4) The invention provides a thermal transfer printer which comprises an ink layer made of the ink for the thermal transfer carbon ribbon or the thermal transfer carbon ribbon. In view of the advantages of the ink layer made of the ink for the thermal transfer ribbon or the thermal transfer ribbon, the thermal transfer printer has the same advantages.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a thermal transfer ribbon according to an embodiment of the present invention.
Icon: 10-a substrate; 20-back coating; 30-a base coat; 40-ink layer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the implementation, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to a first aspect of the invention, the ink for the thermal transfer ribbon is provided, and comprises the following raw materials in parts by weight:
20-40 parts of saturated polyester resin and 15-25 parts of plasticizer;
wherein the plasticizer comprises phthalate plasticizer.
Specifically, a saturated polyester resin is used as a main resin of the ink for the thermal transfer ribbon. Typical, but not limiting, parts by weight of the saturated polyester resin are 20 parts, 22 parts, 24 parts, 25 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 35 parts, 36 parts, 38 parts, or 40 parts.
Plasticizers are a class of substances that are added to polymer systems to increase the plasticity of the polymer. In the present invention, the plasticizer includes phthalate-based plasticizers. The phthalate plasticizer has similar polarity with the saturated polyester resin, so the addition of the phthalate plasticizer can weaken intermolecular force among the saturated polyester resin molecules, reduce the crystallinity of the saturated polyester resin molecular chains and increase the mobility of the saturated polyester resin molecular chain segments, thereby increasing the fluidity of the saturated polyester resin in a heating state and reducing the transfer temperature of the saturated polyester resin in the ink for the thermal transfer ribbon, so that the ink for the thermal transfer ribbon is more suitable for being applied to the thermal transfer ribbon, and further effectively improving the transfer quality, the transfer definition and the medium adaptability of the ribbon.
Typical but non-limiting parts by weight of the plasticizer are 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts or 25 parts.
The ink for the thermal transfer ribbon comprises raw materials such as saturated polyester resin, plasticizer and the like, wherein the specific type of plasticizer acts with the saturated polyester resin, can effectively increase the fluidity of the saturated polyester resin in a heating state, increase the free volume of the saturated polyester resin, reduce the integral softening point and simultaneously reduce the breaking strength of the saturated polyester resin, plays a good role in plasticizing saturated polyester resin, reduces the transfer temperature of the saturated polyester resin in the ink for the thermal transfer ribbon, so that the thermal transfer ribbon prepared by the ink for the thermal transfer ribbon has high adaptation speed, clear printing quality and excellent scratch resistance, the printing effect on various media is good, the temperature range suitable for transfer printing is large, and a suitable window can be found within the range of 80-140 energy levels within the range of normal printing speed.
As an alternative embodiment of the present invention, the phthalate-based plasticizer includes any one of or a combination of at least two of dicyclohexyl phthalate, dicyclohexyl terephthalate, or diisooctyl phthalate, and preferably includes dicyclohexyl phthalate.
The specific type, molecular weight and polarity difference from the saturated polyester resin of the phthalate plasticizer directly affect the plasticizing effect. Therefore, the specific type of the phthalate plasticizer is further optimized, so that a good plasticizing effect can be achieved, and the performance of the ink for the thermal transfer ribbon can be improved.
As an alternative embodiment of the present invention, the saturated polyester resin includes a low molecular weight saturated polyester resin and a high molecular weight saturated polyester resin;
preferably, the low molecular weight saturated polyester resin has a number average molecular weight of 1000 to 7000 (as determined by gas phase permeation) and a Tg of 30 to 55 ℃ as determined by Differential Scanning Calorimetry (DSC method). The low molecular weight saturated polyester resin typically, but not by way of limitation, has a number average molecular weight of 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, or 7000; typical but non-limiting Tg values for low molecular weight saturated polyester resins are 30 deg.C, 32 deg.C, 34 deg.C, 35 deg.C, 36 deg.C, 38 deg.C, 40 deg.C, 42 deg.C, 44 deg.C, 45 deg.C, 46 deg.C, 48 deg.C, 50 deg.C, 52 deg.C, 54 deg.C or 55 deg.C.
Preferably, the high molecular weight saturated polyester resin has a number average molecular weight of 10000 to 30000 (measured by gas phase permeation) and a Tg value of-30 to 10 ℃ measured by DSC. The high molecular weight saturated polyester resin typically, but not limited to, has a number average molecular weight of 10000, 12000, 14000, 15000, 16000, 18000, 20000, 22000, 24000, 25000, 26000, 28000, 29000, or 30000; typical but not limiting Tg values of the high molecular weight saturated polyester resin are-30 ℃, -28 ℃, -26 ℃, -25 ℃, -22 ℃, -20 ℃, -18 ℃, -16 ℃, -15 ℃, -12 ℃, -10 ℃, -8 ℃, -6 ℃, -5 ℃, -4 ℃, -2 ℃, 0 ℃, 2 ℃, 4 ℃, 5 ℃, 6 ℃, 8 ℃ or 10 ℃.
The low-molecular-weight saturated polyester resin and the high-molecular-weight saturated polyester resin are compounded, so that the transfer printing temperature is low, the range of a transfer printing window is large, and the transfer printing window is suitable from the lowest concentration to the highest concentration of a printer.
In an alternative embodiment of the present invention, the saturated polyester resin has a weight ratio of the low molecular weight saturated polyester resin to the high molecular weight saturated polyester resin of (5 to 6.5): (3.5-5); typical but not limiting weight ratios of the low molecular weight saturated polyester resin and the high molecular weight saturated polyester resin are 5:3.5, 5:4, 5:4.5, 5:5, 5.5:3.5, 5.5:4, 5.5:4.5, 5.5:5, 6:3.5, 6:4, 6:4.5, 6:5, 6.5:3.5, 6.5:4, 6.5:4.5 or 6.5: 5.
Through further limiting the weight ratio of the low-molecular-weight saturated polyester resin to the high-molecular-weight saturated polyester resin, the transfer definition after transfer printing is good, the transfer printing window range is large, and meanwhile, the imprint after transfer printing has good scratch resistance.
As an alternative embodiment of the present invention, the low molecular weight saturated polyester resin may be one of or a combination of at least two of Japanese Enegy Ke UE3320, Japanese Enegy Ke UE3350 or Japanese Enegy Ke UE9820, preferably Japanese Enegy Ke UE 3320.
As an alternative embodiment of the present invention, the trade name of the high molecular weight saturated polyester resin includes any one or a combination of at least two of japan eastern ocean spinning GK570, japan eastern ocean spinning 550, japan eastern ocean spinning 560, japan eastern ocean spinning 630, japan ewnigkok UE3530, japan ewnigkok UE3400, or japan ewnigkok UE3410, preferably japan eastern ocean spinning GK 570.
The specific marks of the low-molecular-weight saturated polyester resin and the high-molecular-weight saturated polyester resin are further limited, so that the low-molecular-weight saturated polyester resin and the high-molecular-weight saturated polyester resin have better matching effect, and the transfer printing temperature and the scratch resistance are favorably regulated.
As an optional embodiment of the invention, the raw materials of the ink also comprise wax, and the weight part of the wax is 10-20 parts.
The main effects of the wax include accelerated transfer, affecting transfer and scratch resistance. Typical but non-limiting parts by weight of the wax are 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts or 20 parts.
As an alternative embodiment of the invention, the wax comprises any one or a combination of at least two of carnauba wax, candelilla wax, rice bran wax, montan wax, fischer-tropsch wax or polyethylene wax (PE wax), preferably carnauba wax;
the carnauba wax is natural plant wax extracted from palm leaves growing in northeast parts of Brazil in south America, has good emulsifying property, adhesiveness, friction property, smoothness and viscosity, and is added into the ink for the thermal transfer ribbon, so that the transfer performance of the ink is improved.
As an optional embodiment of the invention, the raw materials of the ink also comprise a pigment, and the weight part of the pigment is 20-40 parts.
By adding the pigment to the ink for the thermal transfer ribbon, a certain decorative color can be imparted to the ink, and the properties of the ink, such as storage properties and surface smoothness after transfer, can be improved.
Typical but non-limiting parts by weight of the pigment are 20 parts, 22 parts, 24 parts, 25 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 35 parts, 36 parts, 38 parts or 40 parts.
As an alternative embodiment of the present invention, the pigment comprises an organic pigment and/or an inorganic pigment, preferably an inorganic pigment, and further preferably carbon black.
Specific types of carbon Black are not limited, and examples thereof include carbon Black mobut L, carbon Black pear L, and carbon Black DL 3.
As an optional embodiment of the invention, the raw materials of the ink also comprise a dispersant, and the weight part of the dispersant is 1-3 parts.
Typical but non-limiting parts by weight of the dispersant are 1 part, 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.8 parts, or 3 parts.
In an alternative embodiment of the present invention, the dispersant comprises any one or a combination of at least two of luborun S5000, luborun S17000, and luborun S24000, preferably luborun S24000.
As an optional embodiment of the invention, the ink comprises the following raw materials in parts by weight:
22-38 parts of saturated polyester resin, 16-24 parts of plasticizer, 11-19 parts of wax, 22-38 parts of pigment and 1.2-2.8 parts of dispersant;
preferably, the ink comprises the following raw materials in parts by weight:
24-36 parts of saturated polyester resin, 18-23 parts of plasticizer, 12-18 parts of wax, 23-36 parts of pigment and 1.4-2.6 parts of dispersant.
Through further limiting the consumption of the raw materials in the ink, the coordination effect among the raw materials is more remarkable, and the transfer performance and the scratch resistance of the ink for the thermal transfer ribbon are improved.
According to the second aspect of the present invention, there is also provided a method for preparing an ink for a thermal transfer ribbon, comprising the steps of:
the saturated polyester resin, the plasticizer, the optional wax, the optional pigment, the optional dispersant and the solvent are mixed to obtain the ink for the thermal transfer ribbon.
In the present invention, "optional wax" means that wax may or may not be added, "optional pigment" means that pigment may or may not be added, and "optional dispersant" means that dispersant may or may not be added.
The preparation method of the ink for the thermal transfer ribbon provided by the invention is simple to operate, stable in process and suitable for industrial mass production.
The ink contains a solid component composed of a saturated polyester resin, a plasticizer, optionally a wax, optionally a pigment, and optionally a dispersant, and is dissolved in a solvent. As an alternative embodiment of the invention, the solids content of the solid constituents of the ink is from 20 to 40% by weight. Typical but non-limiting solids contents are 20 wt%, 22 wt%, 24 wt%, 25 wt%, 26 wt%, 28 wt%, 30 wt%, 32 wt%, 34 wt%, 35 wt%, 36 wt%, 38 wt% or 40 wt%.
According to a third aspect of the invention, the thermal transfer ribbon is further provided, and the ink layer is prepared by using the ink for the thermal transfer ribbon.
In view of the advantages of the ink for the thermal transfer ribbon, the thermal transfer ribbon has the advantages of high adaptation speed, clear printing quality, excellent scratch resistance, good printing effect on various media and large temperature range suitable for transfer printing.
As an alternative embodiment of the present invention, the thermal transfer ribbon further includes a back coating layer 20, a substrate 10, and a primer layer 30, the back coating layer 20 is disposed on one side of the substrate 10, the primer layer 30 and the ink layer 40 are disposed on the other side of the substrate 10, the primer layer 30 is disposed between the substrate 10 and the ink layer 40, and a schematic structural diagram of the thermal transfer ribbon is shown in fig. 1.
As an optional embodiment of the present invention, the base coat is made of a base coat material, and the base coat material comprises the following raw materials in parts by weight: 80-90 parts of wax and 10-20 parts of resin;
typical but non-limiting parts by weight of the wax in the primer are 80, 82, 85, 89 or 90 parts.
Typical, but non-limiting, parts by weight of the resin in the primer are 10, 12, 14, 15, 16, 18, 19, or 20 parts.
As an alternative embodiment of the invention, the wax in the primer coating material comprises any one or a combination of at least two of palm wax, candelilla wax or paraffin wax;
preferably, the resin includes any one of an acrylic resin, an epoxy resin, or an ethylene-vinyl acetate copolymer (EVA resin), or a combination of at least two thereof.
The undercoat layer has good transfer performance by limiting the amount and the kind of each raw material in the undercoat material.
As an alternative embodiment of the invention, the substrate comprises PET polyester film.
Preferably, the back coating comprises a silicone modified polyacrylate back coating.
According to a fourth aspect of the present invention, there is also provided a thermal transfer printer including an ink layer or a thermal transfer ribbon made using the ink for a thermal transfer ribbon described above.
In view of the advantages of the ink layer made of the ink for the thermal transfer ribbon or the thermal transfer ribbon, the thermal transfer printer has the same advantages.
The present invention will be further described with reference to specific examples and comparative examples. Wherein, the low molecular weight saturated polyester resin UE3320, UE3350, UE3320, UE9820, UE3400, UE3410 and UE3530 are all purchased from Ewing Jike, Japan, the number average molecular weight of the UE3320 is 1800, the Tg value is 40 ℃, the number average molecular weight of the UE3350 is 5000, the Tg value is 52 ℃, the number average molecular weight of the UE9820 is 2000, the Tg value is 52 ℃, the number average molecular weight of the UE3530 is 17000, and the Tg value is-17 ℃; UE3400, with a number average molecular weight of 25000 and a Tg value of-20 ℃, UE3410, with a number average molecular weight of 23000 and a Tg value of-32 ℃; high molecular weight saturated polyester resins GK570 and GK560, both available from Toyobo, Japan, had a number average molecular weight of GK570 of 19000, a Tg of 0 deg.C, a number average molecular weight of GK560 of 19000, a Tg of 7 deg.C, and a dispersant brand of Luborun S24000.
Example 1
The embodiment provides ink for a thermal transfer ribbon, which comprises an ink main agent and a solvent toluene, wherein the ink main agent comprises the following raw materials in parts by weight:
332020 parts of low molecular weight saturated polyester resin UE, 018 parts of high molecular weight saturated polyester resin GK57, 20 parts of plasticizer dicyclohexyl phthalate, 20 parts of carnauba wax powder, 20 parts of carbon black and 240002 parts of dispersant Luborun S;
the solid content of the ink main agent in the ink for the thermal transfer ribbon is 30 wt%.
Example 2
This example provides an ink for thermal transfer ribbon, which is prepared by using the same raw materials and amounts as in example 1, except that dicyclohexyl phthalate, which is a plasticizer in the main agent of the ink, was replaced with dicyclohexyl terephthalate.
Example 3
This example provides an ink for thermal transfer ribbon, which is prepared by replacing dicyclohexyl phthalate, a plasticizer in the main agent of the ink, with diisooctyl phthalate, and the raw materials and the amounts used are the same as those in example 1.
Example 4
This example provides an ink for thermal transfer ribbon, except that the plasticizer dicyclohexyl phthalate in the main agent of the ink was replaced by a mixture of dicyclohexyl phthalate and diisooctyl phthalate, wherein the weight ratio of dicyclohexyl phthalate to diisooctyl phthalate was 1:1, and the other raw materials and amounts were the same as in example 1.
Example 5
This example provides an ink for thermal transfer ribbon, which is prepared by using the same materials and amounts as in example 1, except that the plasticizer dicyclohexyl phthalate is 15 parts by weight.
Example 6
This example provides an ink for thermal transfer ribbon, which is prepared by using the same materials and amounts as in example 1, except that the plasticizer dicyclohexyl phthalate is 25 parts by weight.
Example 7
This example provides an ink for thermal transfer ribbon, which is prepared by replacing 332020 parts of a low molecular weight saturated polyester resin UE and 57018 parts of a high molecular weight saturated polyester resin GK570 in an ink base with 38 parts of a high molecular weight saturated polyester resin GK570, and using the same raw materials and amounts as in example 1.
Example 8
The embodiment provides ink for a thermal transfer ribbon, which comprises an ink main agent and a solvent butanone, wherein the ink main agent comprises the following raw materials in parts by weight:
low molecular weight saturated polyester resin UE 982010 parts, high molecular weight saturated polyester resin GK 56012 parts, plasticizer phthalic acid dicyclohexyl ester 25 parts, carnauba wax powder 20 parts, carbon black 30 parts and dispersant Luborun S240003 parts;
the solid content of the main ink agent in the ink for the thermal transfer ribbon is 25 wt%.
Example 9
The embodiment provides ink for a thermal transfer ribbon, which comprises an ink main agent and a solvent ethyl acetate, wherein the ink main agent comprises the following raw materials in parts by weight:
335015 parts of low-molecular-weight saturated polyester resin UE, 57025 parts of high-molecular-weight saturated polyester resin GK, 15 parts of plasticizer dicyclohexyl terephthalate, 15 parts of carnauba wax powder, 28 parts of carbon black and 240002 parts of dispersant Luborun S;
the solid content of the main ink agent in the ink for the thermal transfer ribbon is 40 wt%.
The preparation method of the ink for the thermal transfer ribbon provided in the above embodiments 1 to 9 includes the following steps:
dissolving saturated polyester resin and a plasticizer in a solvent, then adding carbon black and wax powder, grinding, and mixing uniformly to obtain the ink for the thermal transfer ribbon.
Examples 10 to 18
Embodiments 10 to 18 provide a thermal transfer ribbon, respectively, including ink layers, the ink layers being made of the inks for thermal transfer ribbons provided in embodiments 1 to 9, respectively;
the thermal transfer ribbon also comprises a back coating, a substrate and a bottom coating, wherein the back coating is arranged on one surface of the substrate, and the bottom coating and the ink layer are sequentially arranged on the other surface of the substrate;
wherein the back coating is polysiloxane modified polyacrylate back coating; the base material is a PET polyester film with the thickness of 4.5 μm; the base coat is made of a base coat material, and the base coat material comprises the following raw materials in parts by weight:
4 parts of carnauba wax powder, 28 parts of candelilla wax, 8 parts of No. 64 paraffin wax, 14 parts of acrylic resin and 10 parts of EVA resin.
Embodiments 10-18 provide methods of making a thermal transfer ribbon, comprising:
uniformly coating the back coating material of the back coating layer on one surface of the PET substrate by using a coating machine, wherein the coating weight is 0.05-0.2g/m2Forming a back coating;
uniformly coating the priming coating material of the priming coating on the other side of the PET substrate, wherein the coating weight is 0.6-1.4g/m2Forming a base coat;
then evenly coating the ink for the thermal transfer ribbon on the bottom coating at room temperature, wherein the coating weight is 0.8-1.2g/m2And drying at 70 ℃ to obtain the thermal transfer ribbon.
Comparative example 1
The comparative example provides ink for a thermal transfer ribbon, which comprises an ink main agent and a solvent toluene, wherein the ink main agent comprises the following raw materials in parts by weight:
332040 part of low-molecular-weight saturated polyester resin UE, 57015 part of high-molecular-weight saturated polyester resin GK, 23 parts of carnauba wax powder, 20 parts of carbon black and 2 parts of dispersant;
the solid content of the ink main agent in the ink for the thermal transfer ribbon is 30 wt%.
Comparative example 2
The comparative example provides ink for a thermal transfer ribbon, which comprises an ink main agent and a solvent toluene, wherein the ink main agent comprises the following raw materials in parts by weight:
the coating comprises, by weight, 332025 parts of a low molecular weight saturated polyester resin UE, 57030 parts of a high molecular weight saturated polyester resin GK, 23 parts of carnauba wax powder, 20 parts of carbon black and 2 parts of a dispersant;
the solid content of the ink main agent in the ink for the thermal transfer ribbon is 30 wt%.
Comparative example 3
This comparative example provides an ink for thermal transfer ribbon, which was the same as in example 1 except that dicyclohexyl phthalate in the main agent of the ink was replaced with triphenyl phosphate.
Comparative example 4
This comparative example provides an ink for thermal transfer ribbon, which was the same as in example 1 except that dicyclohexyl phthalate in the main agent of the ink was replaced with epoxidized soybean oil.
Comparative example 5
This comparative example provides an ink for thermal transfer ribbon, which was the same as in example 1 except that dicyclohexyl phthalate in the main agent of the ink was replaced with adipate.
Comparative example 6
This comparative example provides an ink for a thermal transfer ribbon, which was the same as in example 1 except that 10 parts by weight of dicyclohexyl phthalate was used.
Comparative example 7
This comparative example provides an ink for a thermal transfer ribbon, which was the same as in example 1 except that 30 parts by weight of dicyclohexyl phthalate was used.
Comparative example 8
The comparative example provides ink for a thermal transfer ribbon, which comprises an ink main agent and a solvent toluene, wherein the ink main agent comprises the following raw materials in parts by weight:
332025 parts of low-molecular-weight saturated polyester resin UE, 57023 parts of high-molecular-weight saturated polyester resin GK, 10 parts of dicyclohexyl phthalate, 20 parts of carnauba wax powder, 20 parts of carbon black and 2 parts of dispersant;
the solid content of the ink main agent in the ink for the thermal transfer ribbon is 30 wt%.
Comparative example 9
The comparative example provides ink for a thermal transfer ribbon, which comprises an ink main agent and a solvent toluene, wherein the ink main agent comprises the following raw materials in parts by weight:
332015 parts of low-molecular-weight saturated polyester resin UE, 013 parts of high-molecular-weight saturated polyester resin GK 57013 parts, 30 parts of dicyclohexyl phthalate, 20 parts of carnauba wax powder, 20 parts of carbon black and 2 parts of dispersant;
the solid content of the ink main agent in the ink for the thermal transfer ribbon is 30 wt%.
Comparative examples 10 to 18
Comparative examples 10 to 18 respectively provide thermal transfer ribbons, and the composition and preparation method are the same as those of examples 9 to 16 except that ink layers are respectively prepared using the inks for thermal transfer ribbons provided in comparative examples 1 to 9.
To verify the technical effects of the respective examples and comparative examples, the following experiments were conducted.
Experimental example 1
The thermal transfer carbon tapes provided in examples 10 to 18 and comparative examples 10 to 18 were applied to a thermal transfer printer (a maken emmama X series printer X60) to evaluate the transfer performance and the scratch resistance of the thermal transfer carbon tapes, and the results are shown in table 1.
The test method of the transfer printing performance and the scratch resistance is in accordance with the general specification of the thermal transfer printing ribbon. The transfer printing test contents comprise bar codes, two-dimensional codes, patterns and characters, transfer printing windows with different speeds on a printing test thermal transfer printer can be completely transferred, the transfer printing energy level range is 80-140 energy levels, 10 energy levels are used as one level for testing, the test result of the transfer printing performance is scored, the score range is 0-10, the higher the score is, the lower the representative transfer printing temperature is, the better the definition is, and the transfer printing performance is; the lower the score, the more blurred the representative print and the poorer the transfer performance. The specific scoring criteria were: the score is between 9 and 10, which shows that each transfer medium has good transfer printing and each speed has more than 3 energy level windows; the score is 8-9, which shows that all the transfer media transfer well, and the partial speed has more than 3 energy level windows; scoring for 7-8, wherein each speed has 1-3 energy level windows; grading 5-6, wherein only the transfer printing energy level window of partial speed is within the range of 1-3; below a score of 5, no suitable transfer energy level window can be found at all.
Scratch resistance: and (4) performing friction test on a wear-resistant testing machine, wherein the wear-resistant testing machine tests the load under the condition of 680g, rubbing the special wear-resistant rod until the special wear-resistant rod is exposed, and recording the erasing times of the handwriting.
TABLE 1
As can be seen from the data in table 1, the transfer performance and the scratch resistance performance of the thermal transfer ribbon provided by each example of the present invention are superior to those of the comparative example as a whole.
Examples 11 to 13 and comparative examples 12 to 14 were comparative experiments to example 10, and were different in the kind of plasticizer used. As can be seen from the data in Table 1, the thermal transfer ribbon obtained has good transfer and scratch resistance properties only when the plasticizer is a phthalate plasticizer, and thus, the thermal transfer ribbon of the present invention has a particular limitation in the kind of plasticizer in the ink for thermal transfer ribbon.
Example 14, example 15, and comparative examples 15 and 16 are comparative experiments to example 10, except that the amount of dicyclohexyl phthalate, which is a plasticizer, used in the ink for a thermal transfer ribbon was different. As can be seen from the data in Table 1, the proportion of the plasticizer has a great influence on the whole system and printing, the proportion of the plasticizer is too low, the plasticizing effect is not obvious, the proportion of the plasticizer is too high, and the proportion of the resin is too low, so that the resistance and printing are also influenced.
Comparative examples 10 and 11 are comparative experiments of example 10, and as can be seen from the data in table 1, different plasticizers and different resin ratios have important effects on the transfer definition and scratch resistance of the system, and the high molecular weight saturated polyester resin has a more obvious effect under the action of the plasticizer, and can maintain good scratch resistance while the transfer temperature is reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The ink for the thermal transfer ribbon is characterized by comprising the following raw materials in parts by weight:
20-40 parts of saturated polyester resin and 15-25 parts of plasticizer;
wherein the plasticizer comprises a phthalate plasticizer.
2. The ink for thermal transfer ribbon according to claim 1, wherein the phthalate plasticizer comprises any one of or a combination of at least two of dicyclohexyl phthalate, dicyclohexyl terephthalate, or diisooctyl phthalate, and preferably comprises dicyclohexyl phthalate.
3. The ink for the thermal transfer ribbon as claimed in claim 1, wherein the ink further comprises wax in an amount of 10 to 20 parts by weight;
preferably, the raw materials of the ink also comprise a pigment, and the weight part of the pigment is 20-40 parts;
preferably, the raw materials of the ink also comprise a dispersant, and the weight part of the dispersant is 1-3 parts.
4. The ink for the thermal transfer ribbon as claimed in claim 1, which comprises the following raw materials in parts by weight:
22-38 parts of saturated polyester resin, 16-24 parts of plasticizer, 11-19 parts of wax, 22-38 parts of pigment and 1.2-2.8 parts of dispersant;
preferably, the ink comprises the following raw materials in parts by weight:
24-36 parts of saturated polyester resin, 18-23 parts of plasticizer, 12-18 parts of wax, 23-36 parts of pigment and 1.4-2.6 parts of dispersant.
5. The ink for a thermal transfer ribbon according to any one of claims 1 to 4, wherein the saturated polyester resin comprises a low molecular weight saturated polyester resin and a high molecular weight saturated polyester resin;
preferably, the weight ratio of the low molecular weight saturated polyester resin to the high molecular weight saturated polyester resin in the saturated polyester resin is (5-6.5): (3.5-5);
preferably, the low molecular weight saturated polyester resin has a number average molecular weight of 1000 to 7000 and a Tg value of 30 to 55 ℃ as measured by DSC;
preferably, the low molecular weight saturated polyester resin includes any one of or a combination of at least two of japan ewnigaco UE3320, japan ewnico UE3350, or japan ewnico UE9820, preferably the low molecular weight saturated polyester resin is japanese ewnico UE 3320;
preferably, the number average molecular weight of the high molecular weight saturated polyester resin is 10000-30000, and the Tg value measured by a DSC method is-30-10 ℃;
preferably, the trade name of the high molecular weight saturated polyester resin includes any one or a combination of at least two of japan eastern ocean spinning GK570, japan eastern ocean spinning 550, japan eastern ocean spinning 560, japan eastern ocean spinning 630, japan ewnigkok UE3530, japan ewnigkok UE3400, or japan ewnigkok UE3410, preferably japan eastern ocean spinning GK 570.
6. The ink for thermal transfer ribbon according to claim 3 or 4, wherein the wax comprises any one or a combination of at least two of carnauba wax, candelilla wax, rice bran wax, montan wax, Fischer-Tropsch wax, or PE wax, preferably carnauba wax;
preferably, the pigment comprises an organic pigment and/or an inorganic pigment, preferably an inorganic pigment, further preferably carbon black;
preferably, the grade of the dispersant comprises any one of Luborun S5000, Luborun S17000 or Luborun S24000 or a combination of at least two of the above.
7. The method for preparing the ink for the thermal transfer ribbon according to any one of claims 1 to 6, characterized by comprising the steps of:
the saturated polyester resin, the plasticizer, the optional wax, the optional pigment, the optional dispersant and the solvent are mixed to obtain the ink for the thermal transfer ribbon.
8. A thermal transfer ribbon, which is characterized by comprising an ink layer, wherein the ink layer is prepared from the ink for the thermal transfer ribbon according to any one of claims 1 to 6;
preferably, the thermal transfer ribbon further comprises a back coating layer, a substrate and a bottom coating layer, wherein the back coating layer is arranged on one surface of the substrate, the bottom coating layer and the ink layer are arranged on the other surface of the substrate, and the bottom coating layer is arranged between the ink layer and the substrate.
9. The thermal transfer ribbon of claim 8, wherein the primer layer is made of a primer material, and the primer material comprises the following raw materials in parts by weight: 80-90 parts of wax and 10-20 parts of resin;
preferably, the wax in the priming material comprises any one of or a combination of at least two of palm wax, candelilla wax or paraffin wax;
preferably, the resin comprises any one of acrylic resin, epoxy resin or EVA resin or a combination of at least two of the acrylic resin, the epoxy resin or the EVA resin;
preferably, the substrate comprises a PET polyester film;
preferably, the back coating comprises a silicone modified polyacrylate back coating.
10. A thermal transfer printer comprising an ink layer made of the ink for thermal transfer ribbon according to any one of claims 1 to 6 or the thermal transfer ribbon according to claim 8 or 9.
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| CN114410148A (en) * | 2021-12-22 | 2022-04-29 | 广州亦盛环保科技有限公司 | Low-temperature thermosetting 4D hot bending and stretching forming ink and preparation method thereof |
| CN114872468A (en) * | 2022-06-01 | 2022-08-09 | 曲阜市玉樵夫科技有限公司 | Thermal transfer printing method and thermal transfer coating belt |
| CN115503368A (en) * | 2022-10-12 | 2022-12-23 | 湖南鼎一致远科技发展有限公司 | High-temperature and high-humidity resistant thermal transfer ribbon and preparation method thereof |
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| CN112552736A (en) * | 2020-11-27 | 2021-03-26 | 杭州天地数码科技股份有限公司 | Ink for washing label carbon ribbon, and preparation method and application thereof |
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