A thermal sublimation transfer paper coating and its preparation method and application

Abstract

The present invention relates to the technical field of transfer paper, and in particular to a thermal sublimation transfer paper coating, a preparation method thereof, and an application thereof. By mass, the raw materials of the thermal sublimation transfer paper coating include 10 to 80 parts of ink-absorbing materials, 20 to 80 parts of fillers, 1 to 5 parts of stabilizing materials, 1 to 10 parts of lubricating materials, and 1 to 2 parts of additives; the lubricating material is one or more of zinc stearate, calcium stearate, stearamide, oleamide, ethylene bisstearamide, and paraffin; the stabilizing material is one or more of tri(2-ethylhexyl)phosphoric acid, sodium lauryl sulfate, methyl amyl alcohol, gur gum, fatty acid polyethylene glycol ester, and sodium polyacrylate. The thermal sublimation transfer paper coating of the present invention reduces the generation of impurities in the production process while preventing the coating moisture from seeping into the base paper layer. The coating raw materials have a synergistic effect and have stronger hydrophobic properties, which reduces the problems of ink penetration, burrs, and image ghosting, and improves the accuracy of the image.

Description

[0001] This application is a divisional application of the Chinese invention patent application with the application date of January 27, 2021, application number 202110122116.2, and invention name “A thermal sublimation transfer paper coating, its preparation method and application”. Technical Field

[0002] The invention relates to the technical field of transfer paper, and in particular to a thermal sublimation transfer paper coating and a preparation method and application thereof. Background Art

[0003] Sublimation printing involves printing images such as portraits, landscapes, and text onto sublimation transfer paper in a mirror-like manner using an inkjet printer loaded with sublimation transfer ink. The paper is then heated by a heat transfer device, causing the ink to sublime and penetrate the substrate, resulting in a lifelike transfer of the color image from the paper. Sublimation printing offers advantages such as low cost, strong customization, and a wide range of applications.

[0004] In the existing technology, the production of thermal sublimation transfer paper mainly includes two methods: off-machine coating and on-machine coating. Due to the cumbersome production process, low efficiency and high cost of off-machine coating, it cannot meet the current market price demand for thermal sublimation transfer paper, so the on-machine coating production method has received more and more attention and application. However, when using the on-machine coating process, the transfer papers on the market all have problems such as insufficient ink carrying capacity, obvious penetration and false flowers, and low printing accuracy after transfer. At the same time, there are also paper defects such as coating scratches, coating blocks, uneven coating banner quantity, uneven tension, broken edges, holes, etc. Among them, coating scratches, coating blocks, and uneven coating banner quantity account for as much as 70%.

[0005] Therefore, the existing technology needs to be further improved. Summary of the Invention

[0006] In view of this, it is necessary to provide a thermal sublimation transfer paper coating and a preparation method thereof to address the above-mentioned problems, so as to solve the problems of thermal sublimation transfer paper coating scratches and adhesion of coating impurities, uneven coating, image burrs, penetration, and low precision produced in the machine in the prior art.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a thermal sublimation transfer paper coating. The raw materials of the thermal sublimation transfer paper coating include, by mass, 10 to 80 parts of an ink-absorbing material, 20 to 80 parts of a filler, 1 to 5 parts of a stabilizing material, 1 to 10 parts of a lubricating material, and 1 to 2 parts of an auxiliary agent; the lubricating material is one or more of zinc stearate, calcium stearate, stearamide, oleamide, ethylene bisstearamide, and paraffin; the stabilizing material is one or more of tri(2-ethylhexyl)phosphoric acid, sodium lauryl sulfate, methyl amyl alcohol, gur gum, fatty acid polyethylene glycol ester, and sodium polyacrylate.

[0009] Preferably, in the above-mentioned thermal sublimation transfer paper coating, the stabilizing material is sodium polyacrylate with a weight average molecular weight of 1000 to 5000.

[0010] Preferably, in the above-mentioned thermal sublimation transfer paper coating, the lubricating material is calcium stearate.

[0011] Furthermore, in the above-mentioned thermal sublimation transfer paper coating, the ink-absorbing material is one or more of sodium carboxymethyl cellulose, polyacrylamide, agar, hydroxypropyl cellulose, polyvinyl pyrrolidone, and chitosan.

[0012] Preferably, in the above-mentioned thermal sublimation transfer paper coating, the ink-absorbing material is sodium carboxymethyl cellulose, the degree of substitution of sodium carboxymethyl cellulose is ≥0.6, the purity is ≥90%, and the moisture content is ≤10%.

[0013] Furthermore, in the above-mentioned thermal sublimation transfer paper coating, the filler is one or more of calcined kaolin, light calcium carbonate, titanium dioxide, oxidized starch, native oat starch, and esterified starch.

[0014] Preferably, in the above-mentioned thermal sublimation transfer paper coating, the filler is a mixture of calcined kaolin, light calcium carbonate and oxidized starch.

[0015] Furthermore, in the above-mentioned thermal sublimation transfer paper coating, the auxiliary agents include bactericides, defoaming agents, and leveling agents.

[0016] Furthermore, in the above-mentioned thermal sublimation transfer paper coating, the coating amount of the thermal sublimation transfer paper coating is 3 to 6 gsm.

[0017] Furthermore, in the above-mentioned thermal sublimation transfer paper coating, the thermal sublimation transfer paper coating further comprises 0.1 to 10 parts by mass of a viscous resin.

[0018] In a second aspect, the present invention provides a method for preparing a thermal sublimation transfer paper coating, which comprises the following steps according to the above raw material ratio:

[0019] Step S1: Place water and stabilizing materials in a high-speed dispersion tank and stir at a low speed for 10-20 minutes;

[0020] Step S2: slowly adding filler to the high-speed dispersion tank, feeding the filler twice, with an interval of 10-20 minutes. After the feeding is completed, high-speed dispersion is performed for 30-60 minutes;

[0021] Step S3: slowly add ink absorbing material and disperse at high speed for 60-90 minutes until it is evenly dispersed;

[0022] Step S4: slowly add the viscous resin, lubricating material and additives, and stir at medium speed for 10-30 minutes.

[0023] Furthermore, in the above-mentioned method for preparing the thermal sublimation transfer paper coating, the low-speed stirring speed in step S1 is not less than 500 r / min; the high-speed dispersion speed in step S2 is not less than 1200 r / min; the high-speed dispersion speed in step S3 is not less than 1200 r / min; and the medium-speed stirring speed in step S4 is not less than 500 r / min.

[0024] In a third aspect, the present invention provides use of the above-mentioned thermal sublimation transfer paper coating in the preparation of thermal sublimation transfer paper.

[0025] The invention provides a thermal sublimation transfer paper, which comprises a base paper layer and the thermal sublimation transfer paper coating.

[0026] Furthermore, the above-mentioned thermal sublimation transfer paper also includes a barrier layer, which is located between the base paper layer and the thermal sublimation transfer paper coating; the raw materials of the barrier layer include one or more of starch glue, polyvinyl alcohol, alkyl ketene dimer, silicone structural adhesive, polyamide polyurea resin, and urea-formaldehyde resin.

[0027] Preferably, in the above-mentioned thermal sublimation transfer paper, the raw materials of the barrier layer are 70 to 95 parts by mass of starch glue and 5 to 30 parts by mass of polyvinyl alcohol.

[0028] Furthermore, in the above-mentioned thermal sublimation transfer paper, the barrier layer is applied to the surface of the base paper by surface sizing; and the thermal sublimation transfer paper coating is applied on the barrier layer by a coating mechanism in a papermaking machine.

[0029] The beneficial effects of the present invention are:

[0030] (1) The thermal sublimation transfer paper coating provided by the present invention prevents the moisture of the coating from seeping into the base paper layer, so that the moisture of the coating stays on the surface for a short time, making it easier to dry the moisture, improving the drying speed, and further increasing the production speed. It can be used for high-speed production of one-time forming in the machine at a speed of not less than 500m / min.

[0031] (2) The thermal sublimation transfer paper coating provided by the present invention contains a stabilizing material, which makes the coating more stable and less likely to aggregate to form impurity particles; the lubricating material has a good lubricating effect, which makes the coating less likely to adhere to the coating roller surface during operation, reduces the aggregation of material block impurities, and solves the coating scratches caused by coating impurities and the adhesion of coating impurities; at the same time, it makes the coating more uniform and prevents local quantitative high.

[0032] (3) The coating materials of the thermal sublimation transfer paper of the present invention have a synergistic effect. The selected stabilizing material has a negative charge and forms a package with the surface layer of the lubricating material. A physical complexation occurs between the two, further increasing the hydrophobicity of the lubricating material, thereby reducing ink penetration, burrs and image ghosting problems, and improving image accuracy.

[0033] (4) The thermal sublimation transfer paper coating of the present invention also serves as a lubricating coating mechanism, thereby extending the service life of the coating mechanism in the machine.

[0034] (5) The thermal sublimation transfer paper of the present invention includes a barrier layer and a thermal sublimation transfer paper coating. The interaction between the barrier layer material and the thermal sublimation transfer paper coating material further avoids burrs and penetration caused by ink seepage during the printing process, thereby improving the accuracy of the image. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of the thermal sublimation transfer paper coating coated on the barrier layer of the present invention;

[0036] Figure 2 A schematic structural diagram of the invention in which the thermal sublimation transfer paper coating is directly coated on the base paper layer;

[0037] Figure 3 1 is a comparison diagram of ghosting of printing paper of Example 2, Comparative Example 1 and Comparative Example 4 of the present invention;

[0038] Figure 4 This is a comparison chart of impurities on the printing paper of Example 2, Comparative Example 1 and Comparative Example 4 of the present invention;

[0039] Figure 5 1 is a comparison diagram of printing patterns on printing paper of Example 2, Comparative Example 1 and Comparative Example 4 of the present invention;

[0040] Figure 6 This is a comparison chart of the printing accuracy of printing paper of Example 2, Comparative Example 1 and Comparative Example 4 of the present invention. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be further clearly and completely described below in conjunction with the embodiments of the present invention. It should be noted that the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that if specific conditions are not specified in the examples, the experiments were carried out according to conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0043] Example 1

[0044] A thermal sublimation transfer paper coating comprises, by weight, 32 parts of an ink-absorbing material, 61 parts of a filler, 2 parts of a stabilizing material, 4 parts of a lubricating material, and 1 part of an additive. The ink-absorbing material is sodium carboxymethyl cellulose; the filler is a mixture of calcined kaolin, light calcium carbonate, and oxidized starch; the stabilizing material is sodium polyacrylate with a weight-average molecular weight of 2000; the lubricating material is calcium stearate; and the additive is a mixture of a fungicide, a defoamer, and a dispersant.

[0045] The preparation method of the thermal sublimation transfer paper coating comprises the following steps:

[0046] Step S1: Place water and stabilizing materials in a high-speed dispersion tank and stir at a low speed for 10 minutes;

[0047] Step S2: slowly adding filler to the high-speed dispersion tank, feeding the filler twice, with an interval of 10 minutes. After the feeding is completed, high-speed dispersion is performed for 30 minutes;

[0048] Step S3: slowly add ink absorbing material and disperse at high speed for 60 minutes until the dispersion is uniform;

[0049] Step S4: slowly add the viscous resin, lubricating material and additives, and stir at medium speed for 10 minutes.

[0050] Example 2

[0051] like Figure 1 As shown, a thermal sublimation transfer paper comprises a base paper layer, a barrier layer, and the thermal sublimation transfer paper coating of Example 1. The barrier layer is located between the base paper layer and the thermal sublimation transfer paper coating; the barrier layer is made of 80 parts by weight of starch glue and 20 parts of polyvinyl alcohol.

[0052] The preparation method of thermal sublimation transfer paper is as follows:

[0053] Step 1: Prepare barrier layer raw materials and thermal sublimation transfer paper coating raw materials respectively; wherein the barrier layer raw materials have a solid content of 13% and a viscosity of 40 MPa.s; the thermal sublimation transfer paper coating raw materials have a solid content of 31% and a viscosity of 1300 MPa.s.

[0054] Step 2: The base paper slurry passes through the headbox, forming wire, scraper and press section for dehydration and forming, and then is modified by the Yankee cylinder to obtain the unsized base paper;

[0055] Step 3: Apply the barrier layer coating to the top of the base paper layer prepared in step 2 by roller sizing in a high-speed paper machine; the sizing amount is 1.0 g / m 2 .

[0056] Step 4: Apply the thermal sublimation transfer paper coating material on the barrier layer prepared in step 3 by in-machine coating in a high-speed paper machine; the coating amount is 5g / m 2 .

[0057] Step 5: Dry, calender, and reel the product obtained in step 4 in a high-speed paper machine; slit, rewind, and package outside the high-speed paper machine; the speed of the high-speed paper machine is above 500 m / min; and the product is obtained.

[0058] Example 3

[0059] like Figure 2 As shown, a thermal sublimation transfer paper comprises a base paper layer and a thermal sublimation transfer paper coating. The thermal sublimation transfer paper coating comprises, by weight, 15 parts of an ink-absorbing material, 70 parts of a filler, 2 parts of a stabilizing material, 8 parts of a lubricating material, 5 parts of an adhesive resin, and 2 parts of an additive. The ink-absorbing material is sodium carboxymethyl cellulose; the filler is a mixture of calcined kaolin, light calcium carbonate, and oxidized starch; the stabilizing material is sodium polyacrylate with a weight-average molecular weight of 1000; the lubricating material is calcium stearate, and the adhesive resin is styrene-butadiene latex; and the additive is a mixture of a fungicide, a defoamer, and a dispersant. The preparation method for the thermal sublimation transfer paper coating is the same as in Example 1.

[0060] The preparation method of thermal sublimation transfer paper is as follows:

[0061] Step 1, preparing a thermal sublimation transfer paper coating raw material; the thermal sublimation transfer paper coating raw material has a solid content of 40% and a viscosity of 1500 mPa.s.

[0062] Step 2: The base paper slurry passes through the headbox, forming wire, scraper and press section for dehydration and forming, and then is modified by the Yankee cylinder to obtain the unsized base paper;

[0063] Step 3: Apply the sublimation transfer paper coating material on the base paper layer prepared in step 2 by in-machine coating in a high-speed paper machine; the coating amount is 6g / m 2 .

[0064] Step 4: drying, calendering, and winding the product obtained in step 3 in a high-speed paper machine; slitting, rewinding, and packaging outside the high-speed paper machine; the speed of the high-speed paper machine is above 500 m / min; and the product is obtained.

[0065] Example 4

[0066] A thermal sublimation transfer paper, the structure and preparation method are the same as those in Example 2. The raw materials of the thermal sublimation transfer paper coating are different from those in Example 2. In this embodiment, the raw materials of the thermal sublimation transfer paper coating include, by mass, 24 parts of ink-absorbing material, 70 parts of filler, 3 parts of stabilizing material, 4 parts of lubricating material, 1 part of adhesive resin and 1 part of auxiliary agent. The ink-absorbing material is sodium carboxymethyl cellulose; the filler is a mixture of calcined kaolin, light calcium carbonate and oxidized starch; the stabilizing material is sodium polyacrylate with a weight-average molecular weight of 3000, the lubricating material is calcium stearate; the adhesive resin is styrene-butadiene latex; and the auxiliary agent is a mixture of a bactericide, a defoaming agent and a dispersant. The preparation method of the thermal sublimation transfer paper coating is the same as that in Example 1.

[0067] Example 5

[0068] A thermal sublimation transfer paper, the structure and preparation method are the same as those in Example 2. The raw materials of the thermal sublimation transfer paper coating are different from those in Example 2. In this embodiment, the raw materials of the thermal sublimation transfer paper coating include 32 parts of ink-absorbing material, 61 parts of filler, 2 parts of stabilizing material, 4 parts of lubricating material and 1 part of auxiliary agent, by mass. The ink-absorbing material is sodium carboxymethyl cellulose; the filler is a mixture of calcined kaolin, light calcium carbonate and oxidized starch; the stabilizing material is tri(2-ethylhexyl)phosphoric acid, the lubricating material is calcium stearate; and the auxiliary agent is a mixture of a bactericide, a defoaming agent and a dispersant. The preparation method of the thermal sublimation transfer paper coating is the same as that in Example 1.

[0069] Example 6

[0070] A thermal sublimation transfer paper having the same structure and preparation method as Example 2. The raw materials of the thermal sublimation transfer paper coating are different from those in Example 2. In this embodiment, the raw materials of the thermal sublimation transfer paper coating include, by weight, 32 parts of an ink-absorbing material, 61 parts of a filler, 2 parts of a stabilizing material, 4 parts of a lubricating material, and 1 part of an auxiliary agent. The ink-absorbing material is sodium carboxymethyl cellulose; the filler is a mixture of calcined kaolin, light calcium carbonate, and oxidized starch; the stabilizing material is sodium lauryl sulfate; the lubricating material is calcium stearate; and the auxiliary agent is a mixture of a bactericide, a defoaming agent, and a dispersant. The preparation method of the thermal sublimation transfer paper coating is the same as that of Example 1.

[0071] Comparative Example 1

[0072] A thermal sublimation transfer paper having the same structure and preparation method as Example 2. The raw materials for the thermal sublimation transfer paper coating are different from those in Example 2. In this comparative example, the raw materials for the thermal sublimation transfer paper coating do not include a stabilizing material or a lubricating material. The other raw material components and amounts of the thermal sublimation transfer paper coating are the same as those in Example 2.

[0073] Comparative Example 2

[0074] A thermal sublimation transfer paper having the same structure and preparation method as Example 2. The raw materials of the thermal sublimation transfer paper coating are different from those in Example 2. In this comparative example, the raw materials of the thermal sublimation transfer paper coating do not contain a lubricating material, and the other raw material components and contents are the same as those in Example 2.

[0075] Comparative Example 3

[0076] A thermal sublimation transfer paper having the same structure and preparation method as Example 2. The raw materials for the thermal sublimation transfer paper coating are different from those in Example 2. In this comparative example, the raw materials for the thermal sublimation transfer paper coating do not contain a stabilizing material, and the other raw material components and contents are the same as those in Example 2.

[0077] Comparative Example 4

[0078] Commercially available conventional sublimation transfer paper produced by one-step molding in the machine. (35g sublimation transfer paper purchased from Guangdong Guanhao High-tech Co., Ltd.)

[0079] Data comparison

[0080] The thermal sublimation printing papers prepared in Examples 2 to 6 and Comparative Examples 1 to 3 and conventional thermal sublimation transfer papers available on the market were compared in terms of ghosting, foreign particles on the paper surface, printing artifacts and printing accuracy. The data are shown in Table 1. The comparison diagrams of Example 2, Comparative Example 1 and Comparative Example 4 are shown in Table 1. Figures 3 to 6 shown. Figures 3 to 6 In the figures, a is the transfer paper of Example 2, b is the transfer paper of Comparative Example 1, and c is the transfer paper of Comparative Example 4.

[0081] Table 1. Detection of transfer paper

[0082]

[0083] As can be seen from Table 1, when the stabilizing material and the lubricating material are added to the raw materials of the thermal sublimation transfer paper coating of the present application, physical complexation occurs between the two, resulting in a synergistic effect, which increases the hydrophobic properties of the lubricating material, reduces ink penetration, burrs and image ghosting problems, and improves image accuracy; at the same time, the stabilizing material improves the viscosity and particle size stability of the coating during operation, preventing the coating from agglomerating to form impurity particles that cause coating scratches; the lubricating material prevents the coating from adhering to the coating roller surface due to the lubricating material, thereby preventing the formation of coating scratches during the coating process, and due to its hydrophobic properties, the design vehicle speed is increased, lubricating the coating mechanism, making it more suitable for high-speed production in the machine.

[0084] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A thermal sublimation transfer paper coating, characterized in that: The raw materials of the thermal sublimation transfer paper coating include, by weight, 10 to 80 parts of an ink-absorbing material, 20 to 80 parts of a filler, 1 to 5 parts of a stabilizing material, 1 to 10 parts of a lubricating material, and 1 to 2 parts of an additive; the lubricating material is one or more of zinc stearate and calcium stearate; the stabilizing material is one or more of tri(2-ethylhexyl)phosphoric acid, sodium lauryl sulfate, and sodium polyacrylate; The ink-absorbing material is one or more of sodium carboxymethyl cellulose, polyacrylamide, and hydroxypropyl cellulose; The filler is one or more of calcined kaolin, light calcium carbonate, titanium dioxide, oxidized starch, native oat starch, and esterified starch; The coating can be used for high-speed production of one-shot molding in a machine at a vehicle speed of not less than 500 m / min.

2. A thermal sublimation transfer paper coating, characterized in that: The raw materials of the thermal sublimation transfer paper coating include, by mass, 10 to 80 parts of ink-absorbing material, 20 to 80 parts of filler, 1 to 5 parts of stabilizing material, 1 to 10 parts of lubricating material, and 1 to 2 parts of auxiliary agent; The lubricating material is one or more of zinc stearate and calcium stearate; The stabilizing material is one or more of tri(2-ethylhexyl)phosphoric acid, sodium lauryl sulfate, and sodium polyacrylate; The ink-absorbing material is one or more of sodium carboxymethyl cellulose, polyacrylamide, and hydroxypropyl cellulose; The filler is one or more of calcined kaolin, light calcium carbonate, titanium dioxide, oxidized starch, native oat starch, and esterified starch.

3. The thermal sublimation transfer paper coating according to claim 1 or 2, characterized in that: The auxiliary agent is a mixture of a bactericide, a defoamer and a dispersant.

4. The thermal sublimation transfer paper coating according to claim 1 or 2, characterized in that: The coating amount of the thermal sublimation transfer paper coating is 3 to 6 gsm.

5. The thermal sublimation transfer paper coating according to claim 1 or 2, characterized in that: The thermal sublimation transfer paper coating further comprises 0.1 to 10 parts by mass of a viscous resin.

6. The method for preparing the thermal sublimation transfer paper coating according to claim 5, characterized in that: The following steps are involved: Step S1: Place water and stabilizing materials in a high-speed dispersion tank and stir at a low speed for 10-20 minutes; Step S2: slowly adding filler to the high-speed dispersion tank, feeding the filler twice, with an interval of 10-20 minutes. After the feeding is completed, high-speed dispersion is performed for 30-60 minutes; Step S3: slowly add ink absorbing material and disperse at high speed for 60-90 minutes until it is evenly dispersed; Step S4: slowly add the viscous resin, lubricating material and additives, and stir at medium speed for 10-30 minutes.

7. Use of the thermal sublimation transfer paper coating according to any one of claims 1 to 5 in the preparation of thermal sublimation transfer paper.

8. A thermal sublimation transfer paper, characterized in that: The invention comprises a base paper layer and the thermal sublimation transfer paper coating according to any one of claims 1 to 5.

9. The thermal sublimation transfer paper according to claim 8, characterized in that: It also includes a barrier layer, which is located between the base paper layer and the thermal sublimation transfer paper coating; the barrier layer raw materials include one or more of starch glue, polyvinyl alcohol, alkyl ketene dimer, silicone structural adhesive, polyamide polyurea resin, and urea-formaldehyde resin.

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