A pp substrate coating film for thermal dye sublimation soft label printing and a preparation method thereof

Abstract

The present application relates to a kind of PP substrate coating film for heat sublimation soft label printing and its preparation method, it is related to the field of heat sublimation printing, including the bottom coating and dye receiving layer sequentially attached from bottom to top of PP substrate;The bottom coating is coated by bottom coating paint, and the bottom coating paint includes primer material, paving adhesive and adhesion agent, and the mass amount ratio of the primer material, the paving adhesive and the adhesion agent is (20-36) :(5-11) :(0.25-2);The dye receiving layer is coated by dye receiving layer paint, and the dye receiving layer paint includes main resin material and release agent, and the mass amount ratio of the main resin material and the release agent is (17-23) :(0.25-1).The PP substrate coating film of the present application guarantees high color concentration, high adhesion and high uniformity when used for heat sublimation soft label printing.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thermal dye sublimation printing, and in particular to a PP substrate coating film for thermal dye sublimation soft label printing and a preparation method thereof. BACKGROUND

[0002] Thermal dye sublimation printing technology is often used to replace traditional photo printing because it can achieve continuous tone printing. However, there are problems in the use of PP film (also known as polypropylene film) for thermal dye sublimation soft label printing on the market: (1) special dye receiving coating is required for thermal dye sublimation ribbon image printing, otherwise the color density is very low; (2) PP film is a high molecular material with high crystallinity and low surface tension of non-polar molecular structure, and there are no polar groups such as carbonyl, carboxyl, and hydroxyl in its molecular structure. After the surface is coated with a dye receiving coating, the adhesion is poor, so it is easy to fall off during printing; (3) the unevenness of the surface of matte PP film leads to unevenness of the dye receiving coating, thereby causing uneven soft label printing patterns. In view of this, the present application provides a PP substrate coating film for thermal dye sublimation soft label printing and a preparation method thereof. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a PP substrate coating film for thermal dye sublimation soft label printing and a preparation method thereof. The purpose is to ensure high color density, high adhesion, and high uniformity of the PP substrate coating film of the present application when used for thermal dye sublimation soft label printing.

[0004] To solve the above technical problems, the first object of the present application is to provide a PP substrate coating film for thermal dye sublimation soft label printing, comprising a PP substrate, a primer layer, and a dye receiving layer sequentially attached from bottom to top;

[0005] The primer layer is coated by primer coating, and the primer coating comprises primer material, paving adhesive, and adhesion agent, and the mass usage ratio of the primer material, the paving adhesive, and the adhesion agent is (20-36):(5-11):(0.25-2).

[0006] The dye receiving layer is coated by dye receiving layer coating, and the dye receiving layer coating comprises main resin material and anti-adhesive agent, and the mass usage ratio of the main resin material and the anti-adhesive agent is (17-23):(0.25-1).

[0007] Note: The primer coating and the dye receiving layer coating also include solvents, but the solvents will be removed by drying.

[0008] The present application has the following advantages: (1) The present application solves the problem of poor adhesion between the PP substrate and the dye receiving layer and between the primer layer and the dye receiving layer by coating a primer layer coating mainly composed of primer material and paving adhesive on the PP substrate. The adhesion of the primer layer and the flatness of the dye receiving layer are improved by using paving adhesive and adhesion agent, thereby improving the printing uniformity. The dye receiving capacity and heat resistance of the dye receiving layer are improved by using main resin material and anti-adhesive agent in the dye receiving layer coating, thereby avoiding the adhesion and color bleeding of the dye receiving layer and the ribbon during printing. In summary, the use of the primer layer and the dye receiving layer described above can ensure high color concentration, high adhesion and high uniformity when the PP substrate is used for soft label printing by sublimation, and at the same time, abnormal color bleeding and color loss do not occur.

[0009] (2) The present application reduces the cost and the complexity of the process by using primer material, paving adhesive and adhesion agent as primer layer coating.

[0010] On the basis of the above technical solution, the present application can also be improved as follows.

[0011] Further, the mass usage ratio of the primer material, the paving adhesive and the adhesion agent is (24-32):(6-9):(0.25-1.5), and the mass usage ratio of the main resin material and the anti-adhesive agent is (18-22):(0.25-0.7); the thickness of the primer layer is 1-5 μm, and the thickness of the dye receiving layer is 5-15 μm, preferably, the thickness of the primer layer is 1-3 μm, and the thickness of the dye receiving layer is 5-10 μm.

[0012] Further, the primer material includes any one or at least two or more (herein can be mixed in any ratio) of chlorinated polypropylene (CPP), chlorinated polypropylene modified acrylic resin and chlorinated polypropylene modified polyurethane; the paving adhesive includes any one or at least two or more (herein can be mixed in any ratio) of polyester resin, polyurethane resin, polycarbonate resin and acrylic resin; and the adhesion agent is a silane coupling agent.

[0013] The beneficial effect of the further scheme is that the present application uses any one or more than two of polyester resin, polyurethane resin, polycarbonate resin and acrylic resin, which are compatible with CPP or CPP modified resin (chlorinated polypropylene modified acrylic resin, chlorinated polypropylene modified polyurethane), and can effectively solve the problem of poor adhesion between the primer layer and the PP substrate and between the primer layer and the dye receiving layer, improve the flatness of the dye receiving layer and the uniformity of the printed image.

[0014] Further, the primer coating further comprises a brightening agent and / or a thermal insulation material, the mass usage ratio of the brightening agent to the primer material is (10.1-22.8):(20-36), the mass usage ratio of the thermal insulation material to the primer material is (0.25-2):(20-36), and the particle size of the thermal insulation material is 1-5 μm.

[0015] Further, the brightening agent comprises rutile titanium dioxide and fluorescent brightening agent, the mass usage ratio of the rutile titanium dioxide to the fluorescent brightening agent is (10-22):(0.1-0.8); the thermal insulation material is any one or more than two of silicone resin microparticles, fumed silica, foamed polyurethane, hollow microbeads and metal inorganic oxide, and the metal inorganic oxide comprises any one of aluminum oxide, zinc oxide and titanium oxide.

[0016] The beneficial effect of the further scheme is that the present application improves the brightness of the dye receiving layer by adding a certain amount of brightening agent (rutile titanium dioxide and fluorescent brightening agent) in the primer layer. Meanwhile, the present application improves the dye receiving capacity of the dye receiving layer by adding a certain amount of thermal insulation material in the primer layer, and the use of the brightening agent ensures the high color concentration, high adhesion and high uniformity of the PP substrate coating film of the present application. The added thermal insulation material is, for example, silicone resin microparticles, fumed silica (fumed silica is white fluffy powder at normal temperature and pressure, is a non-crystalline silicon dioxide with thickening, thixotropy, reinforcement, anti-flowing and other functions, and is one of the most important high-tech ultra-fine inorganic new materials), foamed polyurethane, hollow microbeads and metal inorganic oxide such as aluminum oxide, zinc oxide and titanium oxide. The melting point of the thermal insulation material is higher than 300 ℃, the particle size is 1-5 μm, and the preferred particle size is lower than 3 μm. Too large particle size will affect the flatness of the coating surface, and too large addition amount will also affect the flatness of the coating surface, and too small addition amount will not work.

[0017] Further, the main resin material includes any one or at least two or more of polyvinyl chloride, polyvinylidene chloride, and a vinyl chloride-vinyl acetate copolymer, the vinyl chloride-vinyl acetate copolymer being copolymerized from vinyl chloride and vinyl acetate in a weight ratio of 80:20 to 90:10; and the anti-sticking agent includes a benzene ring modified polyether silicone oil or an epoxy modified silicone oil.

[0018] The beneficial effects of the above further scheme are: (1) The main role of the dye receiving layer of the present application is to receive the heat transfer dye, and the main resin material is preferably a halogenated resin such as polyvinyl chloride or polyvinylidene chloride, or a vinyl chloride-vinyl acetate copolymer, and more preferably a vinyl chloride-vinyl acetate copolymer, which is copolymerized from vinyl chloride and vinyl acetate in a weight ratio of 80:20 to 90:10.

[0019] (2) In order to prevent the problem of sticking between the dye receiving layer and the ribbon due to the melting of the dye receiving layer caused by heating during printing, a certain amount of anti-sticking agent (benzene ring modified polyether silicone oil or epoxy modified silicone oil) is added to the dye receiving layer to prevent sticking. The reason is that during the heat transfer printing process, the dye receiving layer migrates to the surface of the ribbon, and the substrate at the same position is in contact with the ribbon for three times, that is, the risk of sticking between the dye receiving layer and the ribbon increases gradually. By adding a certain amount of two non-reactive silicone oils, one is a benzene ring modified polyether silicone oil which can provide good slipperiness at high temperature (about 200°C), and the other is an epoxy modified silicone oil which can provide good slipperiness at low and medium temperature. These two correspond to the low, medium and high color stages of heat transfer printing, that is, when printing different concentrations, the coating provided by the present application can maintain excellent slipperiness, thereby avoiding the problem of color halo and even color loss caused by sticking between the ribbon and the dye receiving layer during printing.

[0020] In order to further reduce the cost, the present application replaces the non-reactive silicone oil with a certain amount of reactive silicone oil and a curing agent, the amount of the reactive silicone oil being 0.5-1.5 phr of the main resin material, and the silicone oil is fixed with the main resin material by the curing agent to increase the adhesion and cohesiveness of the dye receiving layer and reduce the thermal migration of the reactive silicone oil.

[0021] Further, the thickness of the PP substrate is 50-250 μm, and the grammage is 40-200 g / m 2 .

[0022] The second object of the present application is to provide a preparation method of a PP substrate coating film for heat transfer soft label printing, comprising the following steps:

[0023] Step 1: Prepare liquid:

[0024] The primer material, the paving adhesive, and the adhesion agent are dissolved in butanone and toluene solvent, and after stirring and mixing, the primer coating is prepared and is ready for use;

[0025] The dye receiving layer coating is prepared by dissolving the main resin material and the anti-adhesive agent in butanone and toluene solvent, and after stirring and mixing, the dye receiving layer coating is prepared and is ready for use;

[0026] Step 2: Coating:

[0027] The primer coating is prepared by dissolving the primer material, the paving adhesive, and the adhesion agent in butanone and toluene solvent, and after stirring and mixing, the primer coating is prepared and is ready for use; the dye receiving layer coating is prepared by dissolving the main resin material and the anti-adhesive agent in butanone and toluene solvent, and after stirring and mixing, the dye receiving layer coating is prepared and is ready for use; the primer coating is coated on one surface of the PP substrate, and then dried to form a primer layer; the dye receiving layer coating is coated on the surface of the primer layer, and then dried to form a dye receiving layer, thereby obtaining the PP substrate coating film for soft label printing by thermal sublimation.

[0028] Further, in step 1, the primer material, the paving adhesive, and the adhesion agent are dissolved in butanone and toluene solvent, and then the brightening agent and the thermal insulation material are sequentially added, and after stirring and mixing, the primer coating is prepared; in step 2, the primer coating is coated by gravure coating or slot coating, the drying temperature is 60-80°C, and the drying time is 10-60s; the dye receiving layer coating is coated by gravure coating or slot coating, the drying temperature is 60-80°C, and the drying time is 30-80s. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The structure of the PP substrate coating film of the present application is shown in the figure.

[0030] In the figure, the components represented by each number are listed as follows:

[0031] 1-PP substrate, 2-primer layer, 3-dye receiving layer. DETAILED DESCRIPTION

[0032] The principles and features of the present application are described below, and the examples are only used to explain the present application and are not used to limit the scope of the present application.

[0033] Example 1:

[0034] The PP substrate coating film for soft label printing by thermal sublimation of the present embodiment comprises a PP substrate 1, a primer layer 2, and a dye receiving layer 3, which are sequentially attached from bottom to top; the PP substrate 1 uses a PP film with a thickness of 75μm and a grammage of 65g / m 2 , and the manufacturer is Zhongshan Xinguan Adhesive Products;

[0035] The base coat layer 2 is coated by base coat coating material, which includes CPP modified acrylic resin (YL-26GN2 Hangzhou Yunli) 16 parts, polyester resin (VYLON-200 Japan Toyo Spinning) 4 parts, silicone resin microparticles (KMP590 Shin-Etsu Silicone) 0.5 parts, silane coupling agent (KBM 403 Shin-Etsu Silicone) 0.5 parts, 2-butanone 39.5 parts and toluene 39.5 parts;

[0036] The base coat coating material is coated by a gravure coater, and the base coat layer 2 is formed by drying at a drying temperature of X ℃ and a drying time of X s, and the thickness of the base coat layer 2 is 2 μm.

[0037] The dye receiving layer 3 is coated by dye receiving layer coating material, which includes chlorovinyl-vinyl acetate copolymer (CP-450 Huanhua Chemical) 20 parts, silicone resin (KF-6001 Shin-Etsu Silicone) 0.5 parts, isocyanate (MDI-50F Wanhua Chemical) 0.5 parts, 2-butanone 39.5 parts and toluene 39.5 parts;

[0038] The dye receiving layer coating material is coated by a gravure coater, and the dye receiving layer 3 is formed by drying at a drying temperature of 60-80 ℃ and a drying time of 50 s, and the coating thickness is 5 μm.

[0039] Example 2:

[0040] The PP base material coating film for thermal sublimation soft label printing of the present embodiment includes, from bottom to top, a PP base material 1, a base coat layer 2 and a dye receiving layer 3 which are sequentially attached; the PP base material 1 uses a PP film with a thickness of 75 μm and a grammage of 65 g / m 2 , and the manufacturer is Zhongshan Xinguan Adhesive Products;

[0041] The base coat layer 2 is coated by base coat coating material, which includes CPP modified acrylic resin (YL-26GN2 Hangzhou Yunli) 12 parts, polyester resin (VYLON-200 Japan Toyo Spinning) 4 parts, silane coupling agent (KBM 403 Shin-Etsu Silicone) 0.5 parts, rutile titanium dioxide (BLR-699 Hebei Bangtitan) 8 parts, fluorescent whitening agent (LR-B Henan Longrui Chemical) 0.2 parts, 2-butanone 37.65 parts and toluene 37.65 parts;

[0042] The base coat coating material is coated by a gravure coater, and the base coat layer 2 is formed by drying at a drying temperature of 60-80 ℃ and a drying time of 30 s, and the thickness of the base coat layer 2 is 2 μm.

[0043] The dye receiving layer 3 is the same as that of Example 1, and is not repeated.

[0044] Example 3: ​

[0045] The PP base material coating film for heat sublimation soft label printing of the embodiment comprises, from bottom to top, a PP base material 1, a primer layer 2 and a dye receiving layer 3; the PP base material 1 uses a PP film with a thickness of 75 μm and a grammage of 65 g / m 2 , manufactured by Zhongshan Xinguan Adhesive Products;

[0046] The primer layer 2 is the same as that of Example 1, and is not described repeatedly.

[0047] The dye receiving layer 3 is coated by a dye receiving layer coating, which comprises 20 parts of chloroethylene-vinyl acetate copolymer (CP-450, Hanhua Chemical), 0.5 parts of silicone resin (KF-6001, Shin-Etsu Silicone), 0.5 parts of silicone resin (BYK-322, BYK, Germany), 39.5 parts of 2-butanone and 39.5 parts of toluene.

[0048] The dye receiving layer coating is coated by a gravure coater, and the dye receiving layer 3 is formed by drying at a drying temperature of 60-80 ℃ for 50 s, with a coating thickness of 5 μm.

[0049] Example 4:

[0050] The PP base material coating film for heat sublimation soft label printing of the embodiment comprises, from bottom to top, a PP base material 1, a primer layer 2 and a dye receiving layer 3; the PP base material 1 uses a PP film with a thickness of 75 μm and a grammage of 65 g / m 2 , manufactured by Zhongshan Xinguan Adhesive Products;

[0051] The primer layer 2 is the same as that of Example 2, and is not described repeatedly.

[0052] The dye receiving layer 3 is the same as that of Example 3, and is not described repeatedly.

[0053] Comparative Example 1:

[0054] The comparative example directly uses the PP base material 1 without the primer layer 2 and the dye receiving layer 3. The PP base material 1 uses a PP film with a thickness of 75 μm and a grammage of 65 g / m 2 , manufactured by Zhongshan Xinguan Adhesive Products.

[0055] Comparative Example 2:

[0056] The comparative example does not have the primer layer 2, and the dye receiving layer 3 is the same as that of Example 1. The PP base material 1 uses a PP film with a thickness of 75 μm and a grammage of 65 g / m 2 , manufactured by Zhongshan Xinguan Adhesive Products.

[0057] Comparative Example 3:

[0058] The comparative example 2 includes PP substrate 1, primer layer 2 and dye receiving layer 3, which are sequentially attached from bottom to top. The PP substrate 1 uses a PP film with a thickness of 75 μm and a grammage of 65 g / m 2 , which is manufactured by Zhongshan Xinguan Adhesive Products.

[0059] Comparative example 4:

[0060] The comparative example 2 includes PP substrate 1, primer layer 2 and dye receiving layer 3, which are sequentially attached from bottom to top. The PP substrate 1 uses a PP film with a thickness of 75 μm and a grammage of 65 g / m 2 , which is manufactured by Zhongshan Xinguan Adhesive Products.

[0061] The primer layer 2 includes CPP modified acrylic resin (YL-26GN2, Hangzhou Yunli) 16 parts, polyester resin (VYLON-200, Japan Toyo Spinning) 4 parts, 2-butanone 39.5 parts and toluene 39.5 parts; the primer layer coating is applied by a gravure coater, and the primer layer 2 is formed by drying at a drying temperature of 60-80 °C for 30 s, and the thickness of the primer layer 2 is 2 μm.

[0062] The dye receiving layer 3 is consistent with example 1.

[0063] Comparative example 5:

[0064] The comparative example 2 includes PP substrate 1, primer layer 2 and dye receiving layer 3, which are sequentially attached from bottom to top. The PP substrate 1 uses a PP film with a thickness of 75 μm and a grammage of 65 g / m 2 , which is manufactured by Zhongshan Xinguan Adhesive Products.

[0065] The primer layer 2 includes CPP modified acrylic resin (YL-26GN2, Hangzhou Yunli) 20 parts, 2-butanone 39.5 parts and toluene 39.5 parts.

[0066] The dye receiving layer 3 is consistent with example 3.

[0067] Performance test

[0068] The printing test is performed using a DNP DS620 thermal sublimation printer, and the ribbon is a DNP DS620 original ribbon. The color density test pattern is a 255 gray scale pattern, and the size of the printed sample is 6x8 inches. The color uniformity test pattern is a 150 gray scale pattern, and the size of the printed sample is 6x6 inches. The color density and Lab test are performed using an X-Rite i1-PRO3 color difference meter, and the number of test points is 256 (16x16). The color density is the average of 256 points, and the color difference △E*ab is calculated based on the first point. The adhesion test uses a 19 mm wide 3M SCOTCH tape, which is tested vertically at 90°. The test sample is a printed black pattern sample. The adhesion evaluation criteria are as follows:

[0069] A: The coating of the printed sample sheet has no peeling and no trace on the surface.

[0070] B: The coating of the printed sample sheet has no peeling, but has slight trace.

[0071] C: The coating of the printed sample sheet peels off.

[0072] The printing substrate is the PP substrate coating film of Examples 1-4 and the PP substrate 1 film of Comparative Examples 1-5. The test results are shown in Table 1 below. Table 1 Test results of the PP substrate coating film of Examples 1-4 and the PP substrate film of Comparative Examples 1-5

[0073]

[0074] From the test results in Table 1, it can be seen that the PP substrate coating film in Examples 1-4 is close to the effect of the DNP original photo paper in terms of color density and uniformity, which shows that the PP substrate coating film of the present application ensures high color density, high adhesion and high uniformity when used for thermal sublimation soft label printing.

[0075] In summary, by coating the primer layer coating mainly composed of primer material and paving adhesive on the PP substrate 1, the present application solves the problem of poor adhesion between the PP substrate 1 and the dye receiving layer 3, and between the primer layer 2 and the dye receiving layer 3. By using paving adhesive and close contact agent to improve the close contact of the primer layer 2, the flatness of the dye receiving layer 3 is improved, thereby improving the printing uniformity. By adding main resin material and anti-sticking agent in the dye receiving layer coating, the dye receiving capacity and heat resistance of the dye receiving layer 3 are improved, thereby avoiding the sticking and color bleeding of the dye receiving layer 3 and the color band during printing. In summary, by using the above primer layer 2 and dye receiving layer 3, the PP substrate 1 can ensure high color density, high adhesion and high uniformity when used for thermal sublimation soft label printing, and at the same time, abnormal color bleeding and peeling do not occur. In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples. In addition, the skilled person in the art can combine and combine the different embodiments or features of the embodiments or examples described in the present specification without contradiction.

[0076] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that variations, modifications, substitutions and changes can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A PP substrate coated film for dye-sublimation label printing, characterized in that, It includes, from bottom to top, a PP substrate, a base coating, and a dye receiving layer; the PP substrate has a thickness of 75μm and a basis weight of 65g / m². 2 PP film; The base coating is formed by applying a base coating paint, which includes 16 parts of chlorinated polypropylene modified acrylic resin, 4 parts of polyester resin, 0.5 parts of silicone resin microparticle thermal insulation material, 0.5 parts of silane coupling agent, 39.5 parts of 2-butanone, and 39.5 parts of toluene. The base coating is applied using a gravure coating machine and dried to form a base coating with a thickness of 2μm. The dye receiving layer is formed by coating a dye receiving layer coating, which includes 20 parts of vinyl chloride-vinyl acetate copolymer, 0.5 parts of reactive silicone oil, 0.5 parts of isocyanate, 39.5 parts of 2-butanone, and 39.5 parts of toluene. The dye receiving layer coating is applied by a gravure coating machine, and the drying temperature is 60~80℃ for 50s to form a dye receiving layer with a coating thickness of 5μm.

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