Transfer paper and preparation method thereof

Abstract

The invention provides transfer paper and a preparation method thereof. The transfer paper comprises a pulp paper base material, a back glue coating, a calcium carbonate coating, a bottom glue coating, a soft wax coating and an epoxy resin bottom oil coating. And the gum glue coating is attached to one side surface of the pulp paper base material. The calcium carbonate coating is attached to the side face, away from the back glue coating, of the pulp paper base material. The primer glue coating is attached to the side, away from the pulp paper base material, of the calcium carbonate coating. The soft wax coating is attached to the side, away from the calcium carbonate coating, of the primer glue coating. The epoxy resin base oil coating is attached to the side, away from the base glue coating, of the soft wax coating. According to the transfer paper, the efficiency of automatic water transfer printing decal can be effectively improved, and the cost of water transfer printing decal is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of printing paper, in particular to transfer paper and a preparation method thereof. Background Art

[0002] Traditional water transfer paper uses paper as a transfer carrier, and the transfer carrier is coated with a hydrosol layer. After printing a pattern on the watersol layer on the paper surface, the water is used to dissolve the watersol layer, and the pattern is separated and transferred to realize the function of printing and forming irregular curved surface patterns. For example, in the invention patent application with application number CN201210044741.0, in order to improve the flatness of the water transfer paper, a reverse colloid layer is formed on the side of the paper of the transfer carrier away from the hydrosol layer; in another example, in the invention patent application with application number CN201810365164.2, special modified starch and sulfonate are used in the surface sizing of the paper, which improves the water absorption strength of the water transfer paper and thus improves the dissolution efficiency of the hydrosol layer. However, in fact, there is still a problem of slow dissolution speed of the hydrosol layer, and thus the demoulding efficiency is still low. Moreover, after the pattern is separated, it is necessary to transfer the decals and bake the decals. The process is complicated, which limits the efficiency of automated water transfer decals. Moreover, the water after immersion needs to be treated as wastewater, resulting in a high cost of water transfer decals for the product. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a transfer paper and a preparation method thereof which can effectively improve the efficiency of automated water transfer decals and reduce the cost of water transfer decals.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A transfer paper, comprising:

[0006] Pulp and paper substrate;

[0007] A back glue coating, wherein the back glue coating is attached to one side of the pulp and paper substrate;

[0008] A calcium carbonate coating, wherein the calcium carbonate coating is attached to a side of the pulp and paper substrate away from the adhesive coating;

[0009] A primer glue coating, wherein the primer glue coating is attached to a side of the calcium carbonate coating away from the pulp and paper substrate;

[0010] A soft wax coating, wherein the soft wax coating is attached to a side of the primer glue coating away from the calcium carbonate coating;

[0011] An epoxy resin primer coating is attached to a side of the soft wax coating away from the primer glue coating.

[0012] In one embodiment, the thickness of the pulp-paper substrate is 180 μm to 200 μm.

[0013] In one of the embodiments, the thickness of the adhesive coating is 1 μm to 5 μm.

[0014] In one embodiment, the thickness of the calcium carbonate coating is 5 μm to 15 μm.

[0015] In one of the embodiments, the thickness of the primer glue coating is 1 μm to 5 μm.

[0016] In one embodiment, the thickness of the soft wax coating is 3 μm to 10 μm.

[0017] In one of the embodiments, the epoxy resin primer coating has a thickness of 3 μm to 10 μm.

[0018] In one embodiment, the melting point of the soft wax coating is 45°C to 60°C.

[0019] In one embodiment, the pulp and paper substrate includes softwood pulp, hardwood pulp and china clay filler.

[0020] In one embodiment, the adhesive coating comprises wheat starch and water.

[0021] In one embodiment, the primer glue coating includes potato starch and water.

[0022] A method for preparing transfer paper, used for preparing the transfer paper described in any of the above embodiments, the method for preparing transfer paper comprising the following steps:

[0023] obtaining a pulp and paper substrate;

[0024] Performing a coating treatment on the pulp and paper substrate to form a calcium carbonate coating on one side of the pulp and paper substrate;

[0025] Performing a secondary coating treatment on the calcium carbonate coating so as to form a primer glue coating on a side of the calcium carbonate coating away from the pulp and paper substrate;

[0026] The pulp-paper substrate is subjected to three coating treatments, so that a back glue coating is formed on a side of the pulp-paper substrate away from the calcium carbonate layer;

[0027] The primer glue layer is coated four times to form a soft wax coating on the side of the primer glue coating away from the calcium carbonate coating;

[0028] The soft wax coating is coated five times to form an epoxy resin primer coating on a side of the soft wax coating away from the primer glue coating.

[0029] Compared with the prior art, the present invention has at least the following advantages:

[0030] The transfer paper of the present invention allows the back glue coating to be attached to one side of the pulp and paper substrate, which plays a role in strengthening the structure of the pulp and paper substrate and better improves the flatness of the pulp and paper substrate. Furthermore, the calcium carbonate coating is attached to the side of the pulp and paper substrate away from the back glue coating, and the primer glue coating is further attached to the side of the calcium carbonate coating away from the pulp and paper substrate, that is, the calcium carbonate coating is used to effectively improve the adhesion stability of the back glue coating on the pulp and paper substrate, and then the soft wax coating is attached to the side of the primer glue coating away from the calcium carbonate coating, which effectively ensures the stable adhesion of the soft wax coating on the pulp and paper substrate, and further the epoxy resin primer coating is attached to the side of the soft wax coating away from the primer glue coating, that is, the epoxy resin primer coating plays a protective role on the soft wax coating, effectively resisting the occurrence of cracks in the soft wax coating, and when the ink is printed on the epoxy resin primer coating, it has a better adhesion effect on the epoxy resin primer coating, better ensuring the integrity of the printing ink, and then better ensuring the transfer effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a schematic structural diagram of a transfer paper according to one embodiment of the present invention;

[0033] Figure 2 The present invention is a flowchart of a method for preparing transfer paper according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0037] The present application provides a transfer paper. The transfer paper includes a pulp paper substrate, a back glue coating, a calcium carbonate coating, a base glue coating, a soft wax coating and an epoxy resin primer coating. The back glue coating is attached to one side of the pulp paper substrate. The calcium carbonate coating is attached to one side of the pulp paper substrate away from the back glue coating. The base glue coating is attached to one side of the calcium carbonate coating away from the pulp paper substrate. The soft wax coating is attached to one side of the base glue coating away from the calcium carbonate coating. The epoxy resin primer coating is attached to one side of the soft wax coating away from the base glue coating.

[0038] The above-mentioned transfer paper allows the back glue coating to adhere to one side of the pulp and paper substrate, which plays a role in structural reinforcement of the pulp and paper substrate and better improves the flatness of the pulp and paper substrate. Furthermore, the calcium carbonate coating is attached to the side of the pulp and paper substrate away from the back glue coating, and the primer glue coating is further attached to the side of the calcium carbonate coating away from the pulp and paper substrate, that is, the calcium carbonate coating is used to effectively improve the adhesion stability of the back glue coating on the pulp and paper substrate, and then the soft wax coating is attached to the side of the primer glue coating away from the calcium carbonate coating, effectively ensuring the stable adhesion of the soft wax coating on the pulp and paper substrate, and further the epoxy resin primer coating is attached to the side of the soft wax coating away from the primer glue coating, that is, the epoxy resin primer coating plays a protective role on the soft wax coating, effectively resisting the occurrence of cracks in the soft wax coating, and when the ink is printed on the epoxy resin primer coating, it has a better adhesion effect on the epoxy resin primer coating, better ensuring the integrity of the printing ink, and then better ensuring the transfer effect.

[0039] In order to better understand the transfer paper of the present application, the transfer paper of the present application is further explained below:

[0040] See also Figure 1The transfer paper 10 of one embodiment includes a pulp-paper substrate 100, a back glue coating 200, a calcium carbonate coating 300, a primer coating 400, a soft wax coating 500 and an epoxy resin primer coating 600. The back glue coating 200 is attached to one side of the pulp-paper substrate 100. The calcium carbonate coating 300 is attached to one side of the pulp-paper substrate 100 away from the back glue coating 200. The primer coating 400 is attached to one side of the calcium carbonate coating 300 away from the pulp-paper substrate 100. The soft wax coating 500 is attached to one side of the primer coating 400 away from the calcium carbonate coating 300. The epoxy resin primer coating 600 is attached to one side of the soft wax coating 500 away from the primer coating 400.

[0041] The above transfer paper 10 allows the back glue coating 200 to be attached to one side of the pulp-paper substrate 100, which plays a role in structural reinforcement of the pulp-paper substrate 100 and achieves better improvement in the flatness of the pulp-paper substrate 100. Further, the calcium carbonate coating 300 is attached to the side of the pulp-paper substrate 100 away from the back glue coating 200, and the base glue coating 400 is further attached to the side of the calcium carbonate coating 300 away from the pulp-paper substrate 100, that is, the calcium carbonate coating 300 is used to effectively improve the adhesion stability of the back glue coating on the pulp-paper substrate 100, thereby allowing the soft wax coating 500 to be attached to the base glue. The glue coating 400 is away from the side of the calcium carbonate coating 300, which effectively ensures the stable adhesion of the soft wax coating 500 on the pulp and paper substrate 100, and further makes the epoxy resin primer coating 600 adhere to the side of the soft wax coating 500 away from the primer glue coating 400, so that the epoxy resin primer coating 600 plays a protective role on the soft wax coating 500, effectively resisting the occurrence of cracks in the soft wax coating 500, and when the ink is printed on the epoxy resin primer coating 600, it has a better adhesion effect on the epoxy resin primer coating 600, which better ensures the integrity of the printing ink and thus better ensures the transfer effect.

[0042] It can be understood that wax mixtures, such as soft wax, have poor structural stability after solidifying into films at room temperature, that is, they are prone to cracking. As a result, directly using the wax mixture to support the transfer ink is likely to affect the integrity of the transfer ink supported on the soft wax coating, that is, affect the transfer effect. Therefore, in the present application, an epoxy resin primer coating is formed on the soft wax coating, that is, a membrane structure is formed by applying the epoxy resin primer. Since the epoxy resin primer has certain viscoelasticity and better modeling, it can better resist the occurrence of cracking of the soft wax coating, thereby better ensuring the transfer effect.

[0043] It can also be understood that wax paper, that is, the commonly used glossy wax paper, has a poor adhesion effect on ink printing when used for thermal transfer, that is, the transfer ink on the wax paper is seriously missing, which further causes the transfer pattern formed when the glossy wax paper is subjected to thermal transfer to be seriously missing, affecting the integrity of the transfer, that is, affecting the transfer effect. In the present application, an epoxy resin primer coating is formed on the soft wax coating, and the integrity of the transfer ink on the epoxy resin primer coating is better, thereby better ensuring the transfer effect.

[0044] It can also be understood that when ink is transferred through glossy paper, after the glossy paper melts, only the transfer ink remains on the surface of the object to be transferred. When it comes into contact with external objects, the ink on the surface of the object to be transferred is prone to fall off, such as thermal transfer of circuit boards. When further printed using a laser printer, toner is prone to fall off. In the present application, after the soft wax coating melts, the epoxy resin base oil layer and the transfer ink are attached to the surface of the object to be transferred together, which effectively improves the adhesion strength of the transfer ink to the surface of the object to be transferred, thereby improving the adhesion stability of the transfer ink.

[0045] It can also be understood that the soft wax coating quickly completes the transfer through hot melting, effectively avoiding the formation and subsequent treatment of wastewater and other substances, thereby better achieving a reduction in the cost of transfer decals.

[0046] It should be noted that the epoxy resin primer is a material that can be purchased on the market. This application does not protect the composition of the epoxy resin primer, but only protects the epoxy resin primer for use in thermal transfer to form an epoxy resin primer coating, and cooperates with the soft wax coating to achieve the transfer effect and adhesion stability of the transfer ink. Furthermore, the epoxy resin primer comes from Shanghai Kain Chemical, model SM828.

[0047] It should be noted that the soft wax coating is formed by coating with soft wax, and the melting point of the soft wax is 45°C to 60°C. It should be noted that the main components of the soft wax include natural waxes such as turpentine, beeswax, and carnauba wax, which are conventional existing substances, and the soft wax is not described in detail here. Further, the soft wax comes from Foshan Hongsheng Chemical, model 160S.

[0048] In one embodiment, the thickness of the pulp and paper substrate is 180 μm to 200 μm.

[0049] In one embodiment, the thickness of the adhesive coating is 1 μm to 5 μm.

[0050] In one embodiment, the thickness of the calcium carbonate coating is 5 μm to 15 μm.

[0051] In one embodiment, the thickness of the primer glue coating is 1 μm to 5 μm.

[0052] In one embodiment, the thickness of the soft wax coating is 3 μm to 10 μm. Further, the thickness of the epoxy resin primer coating is 3 μm to 10 μm. It should be noted that if the thickness of the soft wax coating is too large, no matter how the thickness of the epoxy resin primer coating is adjusted, it is difficult to achieve the effect of resisting the occurrence of cracks in the soft wax coating. If the thickness of the soft wax coating is too small, it is not conducive to the effective control of the melting temperature range of the soft wax coating, that is, it is easy to cause the soft wax coating to melt locally first, and the remaining part melts later, which greatly affects the transfer effect. In addition, if the thickness of the epoxy resin primer coating is too large, it will affect the consistency of the melting temperature of the soft wax coating. If the thickness of the epoxy resin primer coating is too small, it is difficult to achieve the effect of resisting the occurrence of cracks in the soft wax coating. Therefore, the thickness of the soft wax coating is 3μm~10μm, and the thickness of the epoxy resin primer coating is 3μm~10μm, which effectively achieves the effect of resisting the occurrence of cracks in the soft wax coating, and better ensures the consistency of the melting temperature of the soft wax coating, thereby better ensuring the transfer effect. Further, the thickness ratio of the soft wax coating to the epoxy resin primer coating is 1.2:1.7. Further, the thickness ratio of the soft wax coating to the epoxy resin primer coating is 2:3. The transfer effect is further improved.

[0053] In one embodiment, the melting point of the soft wax coating is 45°C to 60°C. It is understandable that the melting point of the soft wax is relatively low, and it can be melted and the ink transfer can be realized only at a thermal transfer temperature of 45°C to 60°C. Since the melting point of the epoxy resin primer is between 110°C and 120°C, if the wax mixture uses wax paper with a melting point of about 125°C, it cannot be used in conjunction with the epoxy resin primer. If it is forced to be used in combination, the epoxy resin primer will be unstable during the thermal transfer process, thereby affecting the transfer effect and the stability of the transfer ink; if the wax mixture is microcrystalline wax, the melting point is relatively high, usually between 60°C and 90°C, which makes the microcrystalline wax easy to become brittle in a high temperature environment, resulting in easier cracking when the film is formed, making it impossible to use with the epoxy resin primer, that is, when the surface is coated with an epoxy resin primer coating, the viscoelasticity of the epoxy resin primer coating cannot effectively reduce the cracking strength of the microcrystalline wax when the film is formed, thereby causing the transfer effect to be still poor.

[0054] In one embodiment, the pulp-paper substrate includes softwood pulp, hardwood pulp and china clay filler. It can be understood that the main materials of the pulp-paper substrate are softwood pulp, hardwood pulp and china clay filler, and the pulp-paper substrate is prepared by the conventional preparation method. Therefore, the pulp-paper substrate is not described in detail here. Furthermore, the pulp-paper substrate comes from Shandong Henglian Paper Industry.

[0055] In one embodiment, the adhesive coating includes wheat starch and water. It can be understood that the main materials of the adhesive coating are wheat starch and water, and the adhesive coating is prepared by the conventional preparation method. Therefore, the adhesive coating is not described in detail here.

[0056] In one embodiment, the primer glue coating includes potato starch and water. It can be understood that the main materials of the primer glue coating are potato starch and water, and the primer glue coating is prepared by an existing conventional preparation method. Therefore, the primer glue coating is not described in detail here.

[0057] The present application provides a method for preparing transfer paper, which is used to prepare the transfer paper of any of the above embodiments. In order to better understand the method for preparing the transfer paper of the present application, the method for preparing the transfer paper of the present application is further explained below:

[0058] See also Figure 2 A method for preparing a transfer paper according to an embodiment of the present invention comprises the following steps:

[0059] S100, obtaining a pulp and paper substrate. Further, the surface density of the pulp and paper substrate is 150±10 g / m 2 .

[0060] S200, performing a coating treatment on the pulp-paper substrate to form a calcium carbonate coating on one side of the pulp-paper substrate. Further, using a scraper to coat the calcium carbonate coating on one side of the pulp-paper substrate. Further, the surface density of the calcium carbonate coating is 25±5 g / m 2 .

[0061] S300, performing a secondary coating treatment on the calcium carbonate coating so that a primer glue coating is formed on the side of the calcium carbonate coating away from the pulp and paper substrate. Further, a scraper is used to coat the side of the calcium carbonate coating away from the pulp and paper substrate to form a primer glue coating. Further, the surface density of the primer glue coating is 5±1.5 g / m 2 .

[0062] S400, coating the pulp-paper substrate three times to form a back glue coating on the side of the pulp-paper substrate away from the calcium carbonate layer. Further, using a scraper to coat the back glue coating on the side of the pulp-paper substrate away from the calcium carbonate layer. Further, the surface density of the back glue coating is 2±0.6 g / m 2 .

[0063] S500, coating the primer glue layer four times to form a soft wax coating on the side of the primer glue coating away from the calcium carbonate coating. Further, using a roller to coat the side of the primer glue coating away from the calcium carbonate coating to form a soft wax coating. Further, the surface density of the soft wax coating is 5±1 g / m 2 .

[0064] S600, coating the soft wax coating five times, so that the side of the soft wax coating away from the primer glue coating is coated with an epoxy resin primer coating. Further, a scraper is used to coat the side of the soft wax coating away from the primer glue coating to form an epoxy resin primer coating. Further, the surface density of the epoxy resin primer coating is 5±1 g / m 2 Furthermore, the ratio of the surface density of the soft wax coating to the surface density of the epoxy resin primer coating is 1:1.

[0065] The above-mentioned method for preparing transfer paper effectively realizes the step-by-step preparation of the coating layer of the transfer paper.

[0066] It can be understood that when the epoxy resin primer adheres to the soft wax coating to form the epoxy resin primer coating, although the cracking of the soft wax coating can be reduced, in actual operation, the transfer paper is more likely to bend passively, which increases the probability of cracking of the soft wax coating, thereby affecting the transfer effect of the transfer ink of the transfer paper. Therefore, in one of the embodiments, the wax mixture is used to coat the primer glue layer four times to form the soft wax coating.

[0067] In one embodiment, the wax mixture is prepared by the following method:

[0068] Obtain 6 kg of soft wax (from Foshan Hongsheng Chemical, model 160S), 1.2 kg of alumina and polyethylene (the mass ratio of alumina to polyethylene is 67:13, and the particle size D50 of alumina is 0.2 μm), 0.08 kg of glycerol, and 2 kg of polyacrylamide;

[0069] The soft wax is melted at high temperature to form liquid wax oil, and alumina and polyethylene are added to the liquid wax oil and mixed for 6 minutes at a mixing speed of 150 r / min. Then, polyacrylamide is added and mixed for 6 minutes at a mixing speed of 150 r / min. Then, glycerol is added and mixed for 12 minutes at a mixing speed of 150 r / min to obtain a wax mixture.

[0070] It can be understood that the thermal conductor contains inorganic thermal conductive filler, and the ratio of soft wax, glycerin and inorganic thermal conductive filler is adjusted. Glycerin effectively improves the dispersion uniformity of inorganic thermal conductive filler in soft wax, and the addition of inorganic thermal conductive filler effectively improves the adhesion strength of epoxy resin primer coating on the wax mixture, and effectively improves the integrity of printing ink. In addition, the addition of glycerin better improves the flexibility of soft wax, and the addition of inorganic thermal conductive filler effectively improves the structural strength of soft wax, thereby effectively reducing the occurrence of cracking of the wax mixture, and further improving the integrity of printing ink.

[0071] It should also be noted that the addition of the thickener improves the dispersion stability of the inorganic thermally conductive filler in the soft wax, and the thermal insulation effect of the high molecular weight polymer combined with the thickener, thereby enabling the thickener and the inorganic thermally conductive filler to cooperate in rapid thermal conduction and heat storage of the wax mixture after film formation, thereby achieving rapid hot melt transfer of the wax mixture and effectively improving the transfer efficiency.

[0072] It should be noted that the addition of surfactants will cause the melting temperature range of the wax mixture to become wider, thereby affecting the hot melt efficiency of the wax mixture. It can also be understood that not only the addition of surfactants will affect the melting temperature range of the wax mixture, that is, the more high-temperature resistant substances are added to the wax mixture, and the greater the difference in the melting points of the added substances, the greater the impact on the melting temperature range of the wax mixture. Therefore, in the present application, the addition of glycerol not only increases the flexibility of the soft wax and promotes the dispersion effect of the inorganic thermal conductive filler, but also achieves the adhesion strength of the printing ink of the wax mixture in combination with the inorganic thermal conductive material, and effectively reduces the added substances in the wax mixture, ensuring the controllable melting temperature range of the wax mixture. In fact, the addition of glycerol to the wax mixture achieves a narrowing of the melting temperature range of the wax mixture, that is, the melting temperature range of the wax mixture after film formation is narrow and stable, and the complete hot melt transfer of the printing ink can be achieved in 1 second to 2 seconds at 100°C.

[0073] It can be understood that the colloid is polyethylene, and is used in combination with the thermal conductive filler alumina. Since alumina is an inorganic substance, the dispersion effect of alumina in the wax mixture is poor, and it is easy to agglomerate and float when the wax mixture is coated, that is, the alumina is unevenly dispersed in the wax mixture, which in turn affects the hot melt efficiency and film-forming effect of the wax mixture. The addition of polyethylene to alumina and its use in the wax mixture effectively improves the compatibility of alumina in the wax mixture, that is, effectively reduces the agglomeration and floating of alumina when the wax mixture is coated, and the addition of polyethylene effectively reduces the effect of the addition of alumina in the wax mixture on its flexibility, that is, the thermal conductor includes polyethylene and alumina, which effectively ensures the dispersion stability of alumina in the wax mixture, and then the ink adhesion effect of the wax mixture, while better ensuring the flexibility and film-forming effect of the wax mixture, effectively reducing the occurrence of cracking of the wax mixture after film formation, and also improving the structural strength of the wax mixture after film formation, further reducing the occurrence of cracking of the wax mixture after film formation. It should be noted that the amount of inorganic thermally conductive filler used in the wax mixture has a great influence on the adhesion effect of the ink on the surface of the wax mixture. If the amount of inorganic thermally conductive filler used is too small, the adhesion effect of the ink will be poor. If the amount of inorganic thermally conductive filler used is too large, it will affect the overall flexibility and film-forming effect of the wax mixture. Therefore, the mass ratio of colloid and inorganic thermally conductive filler is 67:13, and the amount of soft wax, glycerin and thickener used is combined to effectively improve the adhesion effect of the ink on the surface of the wax mixture, and better improve the film-forming effect and flexibility of the wax mixture.

[0074] Compared with the prior art, the present invention has at least the following advantages:

[0075] The transfer paper 10 of the present invention allows the back glue coating 200 to be attached to one side of the pulp-paper substrate 100, which plays a role in structural reinforcement of the pulp-paper substrate 100 and achieves better improvement in the flatness of the pulp-paper substrate 100. Further, the calcium carbonate coating 300 is attached to the side of the pulp-paper substrate 100 away from the back glue coating 200, and the bottom glue coating 400 is further attached to the side of the calcium carbonate coating 300 away from the pulp-paper substrate 100, that is, the calcium carbonate coating 300 is used to effectively improve the adhesion stability of the back glue coating on the pulp-paper substrate 100, thereby making the soft wax coating attached to The side of the primer glue coating 400 away from the calcium carbonate coating 300 effectively ensures the stable adhesion of the soft wax coating 500 on the pulp and paper substrate 100, and further makes the epoxy resin primer coating 600 adhere to the side of the soft wax coating away from the primer glue coating 400, so that the epoxy resin primer coating 600 plays a protective role on the soft wax coating, effectively resisting the occurrence of cracks in the soft wax coating 500, and when the ink is printed on the epoxy resin primer coating 600, it has a better adhesion effect on the epoxy resin primer coating 600, better ensuring the integrity of the printing ink, and then better ensuring the transfer effect.

[0076] Some specific examples are given below, and if % is mentioned, it means percentage by weight. It should be noted that the following examples do not exhaust all possible situations, and the materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0077] Example 1

[0078] Obtain pulp and paper substrate with a surface density of 140g / m 2 , thickness is 180μm, pulp and paper substrate comes from Shandong Henglian Paper Industry;

[0079] A calcium carbonate coating is formed on one side of the pulp and paper substrate using a scraper. The surface density of the calcium carbonate coating is 20 g / m 2 , thickness is 5 μm;

[0080] A scraper is used to apply a primer coating on the side of the calcium carbonate coating away from the pulp and paper substrate. The surface density of the primer coating is 3.5 g / m 2 , thickness is 1 μm;

[0081] A scraper is used to apply a back glue coating on the side of the pulp and paper substrate away from the calcium carbonate layer. The surface density of the back glue coating is 1.4 g / m 2 , thickness is 1 μm;

[0082] A roller is used to apply a soft wax coating on the side of the primer coating away from the calcium carbonate coating. The surface density of the soft wax coating is 4g / m 2, with a thickness of 3 μm, wherein the soft wax used in the soft wax coating comes from Foshan Hongsheng Chemical, model 160S;

[0083] Use a scraper to apply epoxy resin primer coating on the side of the soft wax coating away from the primer glue coating. The surface density of the epoxy resin primer coating is 4g / m 2 , with a thickness of 3μm, wherein the epoxy resin primer coating comes from Shanghai Kain Chemical, model SM828.

[0084] Example 2

[0085] Get pulp paper substrate with a surface density of 150g / m 2 , thickness is 190μm, pulp and paper substrate comes from Shandong Henglian Paper Industry;

[0086] A calcium carbonate coating is formed on one side of the pulp and paper substrate using a scraper. The surface density of the calcium carbonate coating is 25 g / m 2 , thickness is 10 μm;

[0087] A scraper is used to apply a primer coating on the side of the calcium carbonate coating away from the pulp and paper substrate. The surface density of the primer coating is 5g / m 2 , thickness is 3μm;

[0088] A scraper is used to apply a back glue coating on the side of the pulp and paper substrate away from the calcium carbonate layer. The surface density of the back glue coating is 2g / m 2 , thickness is 3μm;

[0089] Use a roller to apply a soft wax coating on the side of the primer coating away from the calcium carbonate coating. The surface density of the soft wax coating is 5g / m 2 , with a thickness of 6 μm, wherein the soft wax used in the soft wax coating comes from Foshan Hongsheng Chemical, model 160S;

[0090] Use a scraper to apply epoxy resin primer coating on the side of the soft wax coating away from the primer glue coating. The surface density of the epoxy resin primer coating is 5g / m 2 , with a thickness of 6μm, wherein the epoxy resin primer coating comes from Shanghai Kain Chemical, model SM828.

[0091] Example 3

[0092] Obtain pulp and paper substrate with a surface density of 160g / m 2 , thickness is 200μm, pulp and paper substrate comes from Shandong Henglian Paper Industry;

[0093] A calcium carbonate coating is formed on one side of the pulp and paper substrate using a scraper. The surface density of the calcium carbonate coating is 30 g / m 2 , thickness is 15 μm;

[0094] A scraper is used to apply a primer coating on the side of the calcium carbonate coating away from the pulp and paper substrate. The surface density of the primer coating is 6.5 g / m 2 , thickness is 5 μm;

[0095] A scraper is used to apply a back glue coating on the side of the pulp and paper substrate away from the calcium carbonate layer. The surface density of the back glue coating is 2.6 g / m 2 , thickness is 5 μm;

[0096] A roller is used to apply a soft wax coating on the side of the primer coating away from the calcium carbonate coating. The surface density of the soft wax coating is 6g / m 2 , with a thickness of 10 μm, wherein the soft wax used in the soft wax coating comes from Foshan Hongsheng Chemical, model 160S;

[0097] Use a scraper to apply epoxy resin primer coating on the side of the soft wax coating away from the primer glue coating. The surface density of the epoxy resin primer coating is 6g / m 2 , with a thickness of 10 μm, wherein the epoxy resin primer coating comes from Shanghai Kain Chemical, model SM828.

[0098] Example 4

[0099] Get pulp paper substrate with a surface density of 150g / m 2 , thickness is 200μm, pulp and paper substrate comes from Shandong Henglian Paper Industry;

[0100] A calcium carbonate coating is formed on one side of the pulp and paper substrate using a scraper. The surface density of the calcium carbonate coating is 25 g / m 2 , thickness is 15 μm;

[0101] A scraper is used to apply a primer coating on the side of the calcium carbonate coating away from the pulp and paper substrate. The surface density of the primer coating is 5g / m 2 , thickness is 5 μm;

[0102] A scraper is used to apply a back glue coating on the side of the pulp and paper substrate away from the calcium carbonate layer. The surface density of the back glue coating is 2g / m 2 , thickness is 5 μm;

[0103] Use a roller to apply a soft wax coating on the side of the primer coating away from the calcium carbonate coating. The surface density of the soft wax coating is 5g / m 2 , with a thickness of 6 μm, wherein the soft wax used in the soft wax coating comes from Foshan Hongsheng Chemical, model 160S;

[0104] Use a scraper to apply epoxy resin primer coating on the side of the soft wax coating away from the primer glue coating. The surface density of the epoxy resin primer coating is 5g / m 2 , with a thickness of 8.5μm, wherein the epoxy resin primer coating comes from Shanghai Kain Chemical, model SM828.

[0105] Example 5

[0106] Get pulp paper substrate with a surface density of 150g / m 2 , thickness is 200μm, pulp and paper substrate comes from Shandong Henglian Paper Industry;

[0107] A calcium carbonate coating is formed on one side of the pulp and paper substrate using a scraper. The surface density of the calcium carbonate coating is 25 g / m 2 , thickness is 15 μm;

[0108] A scraper is used to apply a primer coating on the side of the calcium carbonate coating away from the pulp and paper substrate. The surface density of the primer coating is 5g / m 2 , thickness is 5 μm;

[0109] A scraper is used to apply a back glue coating on the side of the pulp and paper substrate away from the calcium carbonate layer. The surface density of the back glue coating is 2g / m 2 , thickness is 5 μm;

[0110] Use a roller to apply a soft wax coating on the side of the primer coating away from the calcium carbonate coating. The surface density of the soft wax coating is 5g / m 2 , with a thickness of 5 μm, wherein the soft wax used in the soft wax coating comes from Foshan Hongsheng Chemical, model 160S;

[0111] Use a scraper to apply epoxy resin primer coating on the side of the soft wax coating away from the primer glue coating. The surface density of the epoxy resin primer coating is 5g / m 2 , with a thickness of 7.5μm, wherein the epoxy resin primer coating comes from Shanghai Kain Chemical, model SM828.

[0112] Example 6

[0113] Get pulp paper substrate with a surface density of 150g / m 2 , thickness is 200μm, pulp and paper substrate comes from Shandong Henglian Paper Industry;

[0114] A calcium carbonate coating is formed on one side of the pulp and paper substrate using a scraper. The surface density of the calcium carbonate coating is 25 g / m 2 , thickness is 15 μm;

[0115] A scraper is used to apply a primer coating on the side of the calcium carbonate coating away from the pulp and paper substrate. The surface density of the primer coating is 5g / m 2 , thickness is 5 μm;

[0116] A scraper is used to apply a back glue coating on the side of the pulp and paper substrate away from the calcium carbonate layer. The surface density of the back glue coating is 2g / m 2 , thickness is 5 μm;

[0117] A roller is used to apply a soft wax coating on the side of the primer coating away from the calcium carbonate coating. The surface density of the soft wax coating is 4g / m 2 , with a thickness of 5 μm, wherein the soft wax used in the soft wax coating comes from Foshan Hongsheng Chemical, model 160S;

[0118] Use a scraper to apply epoxy resin primer coating on the side of the soft wax coating away from the primer glue coating. The surface density of the epoxy resin primer coating is 5g / m 2 , with a thickness of 7.5μm, wherein the epoxy resin primer coating comes from Shanghai Kain Chemical, model SM828.

[0119] Example 7

[0120] Get pulp paper substrate with a surface density of 150g / m 2 , thickness is 200μm, pulp and paper substrate comes from Shandong Henglian Paper Industry;

[0121] A calcium carbonate coating is formed on one side of the pulp and paper substrate using a scraper. The surface density of the calcium carbonate coating is 25 g / m 2 , thickness is 15 μm;

[0122] A scraper is used to apply a primer coating on the side of the calcium carbonate coating away from the pulp and paper substrate. The surface density of the primer coating is 5g / m 2 , thickness is 5 μm;

[0123] A scraper is used to apply a back glue coating on the side of the pulp and paper substrate away from the calcium carbonate layer. The surface density of the back glue coating is 2g / m 2 , thickness is 5 μm;

[0124] A roller is used to apply a soft wax coating on the side of the primer coating away from the calcium carbonate coating. The surface density of the soft wax coating is 6g / m 2 , with a thickness of 5 μm, wherein the soft wax used in the soft wax coating comes from Foshan Hongsheng Chemical, model 160S;

[0125] Use a scraper to apply epoxy resin primer coating on the side of the soft wax coating away from the primer glue coating. The surface density of the epoxy resin primer coating is 4g / m2 , with a thickness of 7.5μm, wherein the epoxy resin primer coating comes from Shanghai Kain Chemical, model SM828.

[0126] Example 8

[0127] Get pulp paper substrate with a surface density of 150g / m 2 , thickness is 200μm, pulp and paper substrate comes from Shandong Henglian Paper Industry;

[0128] A calcium carbonate coating is formed on one side of the pulp and paper substrate using a scraper. The surface density of the calcium carbonate coating is 25 g / m 2 , thickness is 15 μm;

[0129] A scraper is used to apply a primer coating on the side of the calcium carbonate coating away from the pulp and paper substrate. The surface density of the primer coating is 5g / m 2 , thickness is 5 μm;

[0130] A scraper is used to apply a back glue coating on the side of the pulp and paper substrate away from the calcium carbonate layer. The surface density of the back glue coating is 2g / m 2 , thickness is 5 μm;

[0131] Use a roller to apply a soft wax coating on the side of the primer coating away from the calcium carbonate coating. The surface density of the soft wax coating is 5g / m 2 , with a thickness of 5 μm, wherein a wax mixture is used in the soft wax coating, and the wax mixture is obtained by the following method: obtain 6 kg of soft wax (from Foshan Hongsheng Chemical, model 160S), 1.2 kg of alumina and polyethylene (the mass ratio of alumina to polyethylene is 67:13, and the particle size D50 of alumina is 0.2 μm), 0.08 kg of glycerol, and 2 kg of polyacrylamide; melt the soft wax at high temperature to form liquid wax oil, add alumina and polyethylene to the liquid wax oil and mix for 6 minutes at a mixing speed of 150 r / min, then add polyacrylamide and mix for 6 minutes at a mixing speed of 150 r / min, then add glycerol and mix for 12 minutes at a mixing speed of 150 r / min to obtain a wax mixture;

[0132] Use a scraper to apply epoxy resin primer coating on the side of the soft wax coating away from the primer glue coating. The surface density of the epoxy resin primer coating is 5g / m 2 , with a thickness of 7.5μm, wherein the epoxy resin primer coating comes from Shanghai Kain Chemical, model SM828.

[0133] Comparative Example 1

[0134] Get pulp paper substrate with a surface density of 100g / m 2, thickness is 150μm, pulp and paper substrate comes from Shandong Henglian Paper Industry;

[0135] A calcium carbonate coating is formed on one side of the pulp and paper substrate using a scraper. The surface density of the calcium carbonate coating is 30 g / m 2 , thickness is 20 μm;

[0136] A scraper is used to apply a primer coating on the side of the calcium carbonate coating away from the pulp and paper substrate. The surface density of the primer coating is 3g / m 2 , thickness is 3μm;

[0137] A scraper is used to apply a back glue coating on the side of the pulp and paper substrate away from the calcium carbonate layer. The surface density of the back glue coating is 5g / m 2 , thickness is 8μm;

[0138] A roller is used to apply a soft wax coating on the side of the primer coating away from the calcium carbonate coating. The surface density of the soft wax coating is 8g / m 2 , thickness is 15 μm, wherein the soft wax used in the soft wax coating comes from Foshan Hongsheng Chemical, model 160S;

[0139] Use a scraper to apply epoxy resin primer coating on the side of the soft wax coating away from the primer glue coating. The surface density of the epoxy resin primer coating is 8g / m 2 , with a thickness of 15 μm, wherein the epoxy resin primer coating comes from Shanghai Kain Chemical, model SM828.

[0140] Comparative Examples 2-3 are water transfer papers on the market. Specifically, Comparative Example 2 uses Wanji New Material TPB water transfer paper; Comparative Example 3 uses Wanji New Material STB water transfer paper, hereinafter referred to as transfer paper. The transfer papers obtained in Examples 1 to 8 and the transfer papers of Comparative Examples 1-3 are printed and transferred with ink. The specifications of the transfer papers are all 10cm*10cm, and the amount of ink on the transfer paper during printing is 20g / m 2 , the transfer paper after printing ink is tested for printing ink, and recorded, and whether there are cracks on the transfer paper is recorded, the results are shown in Table 1:

[0141] Table 1:

[0142]

[0143]

[0144] As can be seen from Table 1, the transfer papers in Examples 1 to 8 can almost reach the level of conventional water transfer papers on the market, but the transfer time is greatly reduced compared with conventional water transfer papers on the market, which is conducive to improving the efficiency of automated transfer. In particular, the transfer paper in Example 8 uses a wax mixture, which effectively reduces the cracking of the soft wax coating and effectively improves the transfer efficiency. In addition, the thickness and surface density of the pulp-paper substrate, the adhesive glue coating, the calcium carbonate coating, the primer glue coating, the soft wax coating and the epoxy resin primer coating in the transfer paper have a certain influence on the adhesion integrity and transfer effect of the printing ink. In particular, the thickness and surface density of the pulp-paper substrate, the adhesive glue coating, the calcium carbonate coating, the primer glue coating, the soft wax coating and the epoxy resin primer coating in Examples 4-5 are the best for the adhesion integrity and transfer effect of the printing ink.

[0145] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A transfer paper, characterized in that: include: Pulp and paper substrate; A back glue coating, wherein the back glue coating is attached to one side of the pulp and paper substrate; A calcium carbonate coating, wherein the calcium carbonate coating is attached to a side of the pulp and paper substrate away from the adhesive coating; A primer glue coating, wherein the primer glue coating is attached to a side of the calcium carbonate coating away from the pulp and paper substrate; A soft wax coating, wherein the soft wax coating is attached to a side of the primer glue coating away from the calcium carbonate coating; An epoxy resin primer coating is attached to a side of the soft wax coating away from the primer glue coating.

2. The transfer paper according to claim 1, characterized in that: The thickness of the pulp and paper substrate is 180 μm to 200 μm.

3. The transfer paper according to claim 1, characterized in that: The thickness of the back glue coating is 1 μm to 5 μm.

4. The transfer paper according to claim 1, characterized in that: The thickness of the calcium carbonate coating is 5 μm to 15 μm.

5. The transfer paper according to claim 1, characterized in that: The thickness of the primer glue coating is 1 μm to 5 μm.

6. The transfer paper according to claim 1, characterized in that: The thickness of the soft wax coating is 3 μm to 10 μm.

7. The transfer paper according to claim 1, characterized in that: The thickness of the epoxy resin primer coating is 3 μm to 10 μm.

8. The transfer paper according to claim 1, characterized in that: The melting point of the soft wax coating is 45°C to 60°C.

9. The transfer paper according to claim 1, characterized in that: The pulp and paper substrate comprises softwood pulp, hardwood pulp and porcelain clay filler; and / or, The adhesive coating comprises wheat starch and water; and / or, The primer glue coating includes potato starch and water.

10. A method for preparing transfer paper, for preparing the transfer paper according to any one of claims 1 to 9, characterized in that: The preparation method of the transfer paper comprises the following steps: obtaining a pulp and paper substrate; Performing a coating treatment on the pulp and paper substrate to form a calcium carbonate coating on one side of the pulp and paper substrate; Performing a secondary coating treatment on the calcium carbonate coating so as to form a primer glue coating on a side of the calcium carbonate coating away from the pulp and paper substrate; The pulp-paper substrate is subjected to three coating treatments, so that a back glue coating is formed on a side of the pulp-paper substrate away from the calcium carbonate layer; The primer glue layer is coated four times to form a soft wax coating on the side of the primer glue coating away from the calcium carbonate coating; The soft wax coating is coated five times to form an epoxy resin primer coating on a side of the soft wax coating away from the primer glue coating.

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