Ink-jet transfer paper as well as preparation method and transfer method thereof

Abstract

The invention provides ink-jet transfer printing paper and a preparation method and transfer printing method thereof, the ink-jet transfer printing paper comprises a base material layer, a polyurethane layer and an ink absorption layer which are arranged in sequence, the polyurethane layer comprises polyurethane, and the dry weight is 20-80 g / m < 2 >; the ink absorption layer is cationic and comprises quaternary ammonium salt, polyurethane and filler, and the dry weight of the ink absorption layer is 4-20 g / m < 2 >. The polyurethane layer can wrap the ink absorption layer between the printing stock and the polyurethane layer after transfer printing, so that the binding strength is improved; the quaternary ammonium salt is water-based ink which is positive ions and can adsorb negative ions, so that the pattern boundary is clear, the filler prevents polyurethane in the ink absorption layer of the area where ink is not printed from being combined with a printing stock during transfer printing, and hollow transfer printing is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of thermal transfer, and particularly to an inkjet hollow transfer paper that can be thermally transferred without drying, a preparation method thereof, and a transfer method thereof. Background Art

[0002] Transfer paper, as an important printing material, is widely used in many fields such as textiles, leather, and boards. At present, there are still some problems in the use of inkjet thermal transfer paper. For example, inkjet thermal sublimation transfer paper can only be transferred onto polyester substrates; some inkjet adhesive transfer papers have insufficient bonding fastness with the printing substrate, resulting in easy peeling and fading of the transferred patterns during subsequent use; although the method disclosed in Patent CN110341337B (a layer structure for fabric inkjet hollow printing and an inkjet hollow printing method) has been widely promoted and used globally, it requires the use of a professional printer and a powder shaking machine to be used, which is not convenient for home DIY inkjet printing and transfer; Patent CN115976879B (a digital heat transfer printing paper and a preparation method thereof) requires the use of a dedicated laser printer and two transfer papers, namely A and B, to be used in combination, resulting in inconvenient use and increased costs; although the method disclosed in Patent Application CN117429156A (a printable thermal sublimation engraving film and a preparation method thereof) also uses water-based ink of disperse dyes for inkjet printing, it does not have a hollow thermal transfer effect. After inkjet printing, it is necessary to wait for the medium to dry before it can be cut as needed by an electronic cutting machine (or manually cut / engraved) to obtain a hollow thermal transfer effect, and the substrate it uses is non-degradable PET film, which has a drawback in terms of environmental protection. Therefore, it is of great practical significance to develop a transfer paper that is convenient to use and environmentally friendly. Summary of the Invention

[0003] The purpose of the present application is to provide an inkjet transfer paper, which solves the problems of insufficient bonding fastness and inability to achieve hollow transfer in the prior art.

[0004] To achieve one of the above-mentioned invention purposes, an embodiment of the present application provides an inkjet transfer paper, which includes a substrate layer, a polyurethane layer, and an ink-absorbing layer arranged in sequence. The polyurethane layer includes polyurethane, and the dry weight is 20 - 80 g / m 2 ; the ink-absorbing layer is cationic and includes quaternary ammonium salt, polyurethane, and filler. The dry weight of the ink-absorbing layer is 4 - 20 g / m 2 .

[0005] As a further improvement of an embodiment of the present application, the ink-absorbing layer is prepared by coating an ink-absorbing layer sizing solution on the polyurethane layer and drying. The components of the ink-absorbing layer sizing solution include, by weight percentage: water-based polyurethane: 5 - 50%, quaternary ammonium salt: 5 - 40%, surfactant 0 - 3%, and the balance is filler and water.

[0006] As a further improvement of an embodiment of the present application, the filler includes an organic filler and an inorganic filler. The organic filler includes PVDF, cationic starch, and cationic cellulose, and the inorganic filler includes silica and titanium dioxide.

[0007] As a further improvement of an embodiment of the present application, the quaternary ammonium salt is selected from one or more of polymers of methacryloyloxyethyl trimethyl ammonium chloride, polymers of acryloyloxyethyl dimethyl benzyl ammonium chloride, polymers of cetyl dimethyl allyl ammonium chloride, and polymers of dimethyl diallyl ammonium chloride.

[0008] As a further improvement of an embodiment of the present application, the polyurethane layer further includes a white organic pigment.

[0009] As a further improvement of an embodiment of the present application, the white organic pigment includes white polyester powder and white nylon powder.

[0010] An embodiment of the present application further provides a method for preparing the foregoing inkjet transfer paper, including the following steps:

[0011] Coat polyurethane on one side of the substrate layer and dry it to obtain a polyurethane layer;

[0012] Add waterborne polyurethane to water and stir, then add a quaternary ammonium salt and a surfactant and stir to obtain an ink-absorbing layer sizing solution, wherein the filler is added before / after the quaternary ammonium salt;

[0013] Coat the ink-absorbing layer sizing solution on the polyurethane layer and dry it to obtain the inkjet transfer paper.

[0014] As a further improvement of an embodiment of the present application, a coating-4 viscometer is used to measure the viscosity of the sizing solution to be 35 - 60 s.

[0015] An embodiment of the present application further provides a transfer method for the foregoing inkjet transfer paper. Print waterborne ink on the ink-absorbing layer side of the inkjet transfer paper. When the transfer paper is wet, stick it to the substrate. Perform hot pressing at a temperature of 160 - 250 °C, and then separate the transfer paper from the substrate. The substrate layer, the polyurethane layer without the printed pattern, and the ink-absorbing layer are peeled off from the substrate.

[0016] As a further improvement of an embodiment of the present application, white ink or transparent ink is added to the waterborne ink, and the waterborne ink is a disperse dye ink.

[0017] One or more technical solutions provided by the present application have at least the following technical effects or advantages:

[0018] The inkjet transfer paper provided by the present application is sequentially provided with a polyurethane layer and an ink-absorbing layer on a substrate layer. The polyurethane layer can be transferred to a printing substrate together with the ink-absorbing layer during thermal transfer, and the ink adsorbed by the ink-absorbing layer is wrapped between the printing substrate and the polyurethane, greatly improving the bonding fastness of the pattern. The ink-absorbing layer is cationic and has a strong adsorption force for anionic water-based ink, enabling high-precision graphic printing and transfer, and can make the edges of the transferred graphics separate clearly; the filler in the ink-absorbing layer plays a role of isolation during thermal transfer, so that the area without ink is not transferred, achieving a hollow thermal transfer effect. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural view of the inkjet transfer paper in an embodiment of the present application.

[0020] Figure 2 is a schematic view after transfer in Example 1.

[0021] Figure 3 is a schematic view after transfer in Example 2.

[0022] 1. Substrate layer; 2. Polyurethane layer; 3. Ink-absorbing layer. Detailed Embodiments

[0023] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0024] For example, if the structure in the figure is flipped, the unit described as being "below" or "beneath" other units or features will be located "above" other units or features. Therefore, the exemplary term "below" can encompass both the upper and lower orientations. It can also be oriented in other ways (rotated 90 degrees or other orientations), and the spatially related descriptive terms used herein are interpreted accordingly.

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] The embodiment of the present application provides an inkjet transfer paper, as Figure 1 shown, including a substrate layer, a polyurethane layer, and an ink-absorbing layer arranged in sequence. The polyurethane layer includes polyurethane, and the dry weight is 20 - 80 g / m 2; The ink absorption layer is cationic and includes quaternary ammonium salts, polyurethane, and fillers. The dry weight of the ink absorption layer is 4 - 20 g / m 2 .

[0027] In this application, a polyurethane layer and an ink absorption layer are sequentially arranged on the substrate layer. The polyurethane layer can be transferred to the printing substrate together with the ink absorption layer during thermal transfer, wrapping the ink adsorbed by the ink absorption layer between the printing substrate and the polyurethane, greatly improving the bonding fastness of the pattern and reducing the pattern shedding rate.

[0028] The ink absorption layer is cationic and has a strong adsorption force for negative water-based inks, enabling high-precision graphic printing and transfer, and can make the edges of the transferred graphics clearly separated; the fillers in the ink absorption layer play an isolation role during thermal transfer, preventing non-ink areas from being transferred, achieving a hollow thermal transfer effect without the need for post-cutting.

[0029] It should be noted here that since the polyurethane layer and the ink absorption layer need to be coated on the surface of the substrate layer and the polyurethane layer respectively by heating and melting or solution / dispersion liquid, etc., and after heating and drying, the molten substance solidifies or the solvent in the solution / dispersion liquid, etc. volatilizes to obtain a solid substance, the dry weight is the gram weight per unit area of the finally formed fixed substance.

[0030] Preferably, the substrate layer is wood pulp paper, chemical fiber paper, mixed fiber paper, or a film. More preferably, it is wood pulp paper. The gram weight of the substrate layer is 80 - 200 g / m 2 .

[0031] In an embodiment of this application, the ink absorption layer is prepared by coating the ink absorption layer sizing solution on the polyurethane layer and drying it. The components of the ink absorption layer sizing solution include, by weight percentage: water-based polyurethane: 5 - 50%, quaternary ammonium salt: 5 - 40%, surfactant 0 - 3%, and the balance is fillers and water.

[0032] The water-based polyurethane in the ink absorption layer sizing solution becomes polyurethane after the sizing solution is dried. During thermal transfer, in the ink absorption layer, the polyurethane in the patterned part is combined with the polyurethane layer and transferred to the printing substrate together.

[0033] Adding 5 - 50% of water-based polyurethane to the ink absorption layer sizing solution can, on the one hand, prevent the transferred pattern from being unstable, and on the other hand, can also prevent the boundary from being unclear after transfer and the need for additional processing and cutting.

[0034] The quaternary ammonium salt provides cations for adsorbing anionic water-based inks during transfer.

[0035] The surfactant is used to reduce the surface tension between the ink absorption layer sizing solution and the polyurethane layer, preventing the ink absorption layer sizing solution from being unevenly coated on the surface of the polyurethane layer. Of course, when the component ratio of the ink absorption layer sizing solution is appropriate, the surfactant can be not added.

[0036] In an embodiment of the present application, polyurethane powder and / or polyester powder can also be added to the ink absorbing layer sizing solution. On the one hand, the powder is granular and can act as a filler to improve the ink absorption ability. On the other hand, it can enhance the firmness of the pattern during thermal transfer.

[0037] In an embodiment of the present application, the filler includes organic filler and inorganic filler. The organic filler includes PVDF (polyvinylidene fluoride), cationic starch, and cationic cellulose, and the inorganic filler includes silica and titanium dioxide.

[0038] PVDF, cationic starch, cationic cellulose, silica, and titanium dioxide are all fine particles with a particle size ≤ 150 μm. The particles will form an overhead structure in the ink absorbing layer, increasing the specific surface area and porosity to improve the ink absorption ability.

[0039] In addition, due to the presence of the filler, during thermal transfer, the polyurethane in the ink absorbing layer where the pattern is not printed will not be transferred to the substrate at high temperature. That is to say, the filler can also play an isolation role to achieve a hollow thermal transfer effect.

[0040] Preferably, the quaternary ammonium salt is selected from one or more of polymers of methacryloyloxyethyltrimethylammonium chloride, polymers of acryloyloxyethyldimethylbenzylammonium chloride, polymers of hexadecyl dimethyl allyl ammonium chloride, and polymers of dimethyldiallylammonium chloride.

[0041] The components and their contents in the ink absorbing layer sizing solution are as follows: waterborne polyurethane: 5 - 50%, quaternary ammonium salt: 5 - 40%, PVDF: 0 - 20%, silica: 0 - 15%, titanium dioxide: 0 - 15%, cationic starch: 0 - 10%, polyurethane powder: 0 - 10%, cationic cellulose: 0 - 5%, surfactant 0 - 3%, and the rest is water.

[0042] In an embodiment of the present application, the polyurethane layer further includes a white organic pigment.

[0043] Since the substrate may be dark, white, or light-colored. When the substrate is light-colored, the color display effect of the ink is good, while when the substrate is black or dark-colored, the color display effect of the ink is poor. Therefore, adding a white organic pigment to the polyurethane layer is equivalent to providing a background color for black or dark substrates to enhance the color display effect.

[0044] In an embodiment of the present application, the white organic pigment includes white polyester powder and white nylon powder.

[0045] When using dye ink for printing, during thermal transfer, the dye will sublimate into a gaseous state and can dye the polyurethane, so that the polyurethane can not only wrap the ink absorbing layer to enhance the bonding firmness, but also show the color of the dye.

[0046] Polyester and nylon are easier to be dyed by dyes than polyurethane, further enhancing the color display effect of the ink.

[0047] The embodiment of the present application also provides a preparation method of the foregoing inkjet transfer paper, including the following steps:

[0048] Coat polyurethane on one side of the substrate layer and dry to obtain a polyurethane layer;

[0049] Add aqueous polyurethane to water and stir, then add quaternary ammonium salt and surfactant and stir to obtain the ink-absorbing layer sizing solution, wherein the filler is added before / after the quaternary ammonium salt;

[0050] Coat the ink-absorbing layer sizing solution on the polyurethane layer and dry to obtain the inkjet transfer paper.

[0051] Polyurethane can be coated on the substrate layer by hot lamination or by using liquid polyurethane to coat the substrate layer.

[0052] When preparing the ink-absorbing layer sizing solution, first add aqueous polyurethane to water and stir. As can be seen from the foregoing, the filler includes cationic fillers such as cationic starch and cationic cellulose, and also includes non-cationic fillers such as PVDF, silica, and titanium dioxide.

[0053] Add the non-cationic filler to water before adding the quaternary ammonium salt, and add the cationic filler after or simultaneously with the quaternary ammonium salt.

[0054] The cations of cationic fillers such as cationic starch and cationic cellulose are relatively weak and are prone to adsorbing non-cationic fillers, causing small particles to agglomerate into large particles and affecting the dispersion effect of non-cationic fillers.

[0055] The non-cationic filler particles are small and have a good dispersion effect in water with a low viscosity. The cation of the quaternary ammonium salt is strong, and adding the cationic filler after or simultaneously with it has less impact on the dispersion effect of the non-cationic filler.

[0056] When the foregoing components make the ink-absorbing layer sizing solution have a good distribution effect on the polyurethane layer, the surfactant may not be added, that is, the component of the surfactant is 0.

[0057] In an embodiment of the present application, after stirring the ink-absorbing layer sizing solution evenly, filter the ink-absorbing layer sizing solution to ensure that the substances in the ink-absorbing layer sizing solution are dispersed evenly. It is preferably filtered with a 100-mesh filter screen.

[0058] In an embodiment of the present application, a Tu-4 viscometer is used to measure the viscosity of the ink-absorbing layer sizing solution, which is 35 - 60 s. The viscosity of the ink-absorbing layer sizing solution is measured in accordance with the standard GB / T 1723-93, so that the ink-absorbing layer sizing solution has a better viscosity, and thus it can be coated on the surface of the polyurethane layer to meet the requirement of a dry weight of 4 - 20 g / m 2 requirements.

[0059] In an embodiment of the present application, the solid content of the ink-absorbing layer sizing solution is 29 - 31%.

[0060] The present application also provides a transfer method for the inkjet transfer paper described in the foregoing claims. Water-based ink is printed on one side of the ink-absorbing layer of the inkjet transfer paper. When the transfer paper is wet, it is adhered to the substrate, and hot pressing is carried out at a temperature of 160 - 250 °C. Then, the transfer paper is separated from the substrate, and the substrate layer, the polyurethane layer without the printed pattern, and the ink-absorbing layer are peeled off from the substrate.

[0061] Water-based ink is printed on one side of the ink-absorbing layer of the inkjet transfer paper. Since the ink-absorbing layer is cationic and the water-based ink is anionic, they have a strong adsorption effect, so that a pattern area with clear boundaries and a non-pattern area are formed on the ink-absorbing layer.

[0062] After printing, when the transfer paper is still wet, it is adhered to the substrate and hot pressed at 160 - 250 °C. The polyurethane in the ink-absorbing layer and the polyurethane in the polyurethane layer are fused under the action of water in the water-based ink and adhered to the substrate. Due to the lack of the action of water and the isolation of the filler, the non-pattern area is not adhered to the substrate.

[0063] After the transfer is completed, when the transfer paper is separated from the substrate, the pattern area of the ink-absorbing layer and the corresponding polyurethane layer are adhered to the substrate, and the ink-absorbing layer and the polyurethane layer corresponding to the non-pattern area are separated from the substrate together with the substrate layer, realizing hollow thermal transfer, so that the textile has breathability and a good hand feeling.

[0064] Preferably, the hot pressing time is 15 - 90 s. When the hot pressing temperature is higher, the hot pressing time can be shorter; when the hot pressing temperature is lower, the hot pressing time can be longer.

[0065] In an embodiment of the present application, white ink or transparent ink is added to the water-based ink, and the water-based ink is a disperse dye ink.

[0066] Specifically: when the substrate is white or light-colored, transparent ink is added to the water-based ink. Since there is no dye in the transparent ink, it can increase the moisture of the inkjet printing and make the color of the pattern transition details better. When the substrate is black or dark-colored, white ink is added to the water-based ink, which can increase the moisture of the inkjet printing and further cover the background color of the black or dark-colored substrate, making the pattern color more beautiful.

[0067] After being heated, the disperse dye ink will be sublimated into a gaseous state. The gaseous dye has stronger penetrability, making the color more beautiful.

[0068] The inkjet transfer paper provided by this application only needs an ordinary water-based inkjet printer to print color graphics and texts on the transfer paper, without waiting for the transfer paper to dry. An ordinary heat transfer machine can be used to thermally transfer the printed graphics and texts on the transfer paper to the surfaces of fabrics, wooden boards, ceramics, leather, etc.

[0069] The water-based raw materials used in preparing the ink-absorbing layer have no volatile organic compound emissions during production and use; compared with the widely used hollow transfer paper process, this transfer paper does not need to sprinkle hot melt powder, thus eliminating dust flying, and does not need to bake and dry the hot melt powder and the paper surface, greatly reducing energy consumption; therefore, it has excellent environmental protection and energy-saving performance.

[0070] The following combines some specific embodiments to further illustrate the technical solutions of this application.

[0071] Example 1

[0072] 1. Substrate layer: Select 120 g / m 2 base paper, with a water absorption value of 15 g / m 2 , a tightness of 0.72, and a whiteness of 80%.

[0073] 2. Polyurethane layer: The polyurethane is coated on one side of the substrate layer by the hot lamination method to form a polyurethane layer, and the coating dry weight is 60 g / m 2 .

[0074] 3. Ink-absorbing layer: The formulation of the ink-absorbing layer glue is as follows:

[0075] Silica PVDF Waterborne polyurethane Quaternary ammonium salt Cationic starch Surfactant <![CDATA[H2O]]> 4.0％ 2％ 30％ 20％ 3％ 1.0％ 40％

[0076] Preparation of the ink-absorbing layer glue:

[0077] (1) Add 40 kg of water to a stirring tank and stir. While stirring, sequentially add 4 kg of silica, 2 kg of PVDF, and 30 kg of water-based polyurethane, and stir evenly;

[0078] (2) Continue to add 20 kg of quaternary ammonium salt (polymer of dimethyldiallylammonium chloride), 3 kg of cationic starch, and 1 kg of surfactant (polyether-modified polyorganosiloxane) to the stirring tank and stir evenly;

[0079] (3) Filter the stirred glue through a 100-mesh filter screen;

[0080] (4) Sampling and testing:

[0081] The viscosity of the ink-absorbing layer glue is measured to be 45 s using a coating-4 viscometer.

[0082] The solid content was measured to be 30% by using an XU-DHS-10A moisture tester.

[0083] (5) Coat the ink-absorbing layer sizing on the polyurethane layer with a metering rod and dry it to form the ink-absorbing layer. Coating dry weight: 6 g / m 2 , and finally obtain the inkjet transfer paper.

[0084] 4. Printing: Print water-based ink + transparent ink on the ink-absorbing layer side of the inkjet transfer paper. Among them, the water-based ink is a disperse dye ink, and there is no dye in the transparent ink.

[0085] 5. Transfer: Immediately attach the printed inkjet transfer paper to the light-colored fabric and place it under a 190°C press for hot pressing for 30 s; immediately separate the inkjet transfer paper from the fabric after transfer to complete the heat transfer, Figure 2 This is a case of heat transfer.

[0086] Example 2

[0087] 1. Substrate layer: Select 120 g / m 2 base paper, water absorption value 15 g / m 2 , tightness 0.72, whiteness 80%.

[0088] 2. Polyurethane layer: Coat with a polyurethane aqueous solution, add 5% white polyester powder and 5% white nylon 12 powder (by weight) to the liquid, stir well, and then coat on one side of the substrate layer. The dry weight is 75 g / m 2 .

[0089] 3. Ink-absorbing layer: The formulation ratio of the ink-absorbing layer sizing is as follows:

[0090] Titanium dioxide PVDF Quaternary ammonium salt Waterborne polyurethane Polyester powder Surfactant <![CDATA[H2O]]> 5.0％ 10％ 30％ 15％ 5％ 1％ 34％

[0091] Preparation of the ink-absorbing layer sizing:

[0092] (1) Add 34 kg of water to the stirring tank and stir. While stirring, sequentially add 5 kg of titanium dioxide, 10 kg of PVDF, 5 kg of polyester powder, and 15 kg of waterborne polyurethane, and stir evenly;

[0093] (2) Continue to add 30 kg of quaternary ammonium salt (polymer of dimethyldiallylammonium chloride) and 1 kg of surfactant (polyether-modified polyorganosiloxane) to the stirring tank and stir evenly;

[0094] (3) Filter the stirred sizing through a 100-mesh filter screen;

[0095] (4) Sampling and testing:

[0096] Measure the viscosity of the ink-absorbing layer sizing with a coating-4 viscometer to be 50 s.

[0097] The solid content was measured to be 30% using an XU-DHS-10A moisture tester.

[0098] (5) Coating the ink-absorbing layer sizing on the polyurethane layer with a metering rod and drying to form the ink-absorbing layer, coating dry weight: 7 g / m 2 , and finally obtaining the inkjet transfer paper.

[0099] 4. Printing: Printing aqueous ink + white ink on the ink-absorbing layer side of the inkjet transfer paper, wherein the aqueous ink is a disperse dye ink.

[0100] 5. Transfer: The printed inkjet transfer paper is immediately adhered to the dark fabric when it is wet and hot-pressed at 190 °C for 30 s under a press; immediately after transfer, the inkjet transfer paper is separated from the fabric to complete the heat transfer, Figure 3 which is a case of heat transfer.

[0101] Examples 1 and 2 were tested in accordance with the standard GBT29865 2013 (Textiles - Colorfastness tests - Colorfastness to rubbing), and the dry / wet rubbing fastness reached grade 5. After washing 10 times in 45 °C hot water, there was still no obvious color fading.

[0102] It should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0103] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of this application, and they are not intended to limit the protection scope of this application. Any equivalent embodiments or modifications made without departing from the technical spirit of this application should be included within the protection scope of this application.

Claims

1. An inkjet transfer paper, characterized in that, It includes a substrate layer, a polyurethane layer, and an ink-absorbing layer arranged in sequence. The polyurethane layer includes polyurethane with a dry weight of 20 to 80 g / m 2 ; The ink-absorbing layer is cationic and includes quaternary ammonium salt, polyurethane, and filler. The dry weight of the ink-absorbing layer is 4 to 20 g / m 2 .

2. The inkjet transfer paper according to claim 1, wherein The ink absorption layer is prepared by coating an ink absorption layer sizing solution on a polyurethane layer and drying it. The components of the ink absorption layer sizing solution include, by weight percentage: aqueous polyurethane: 5-50%, quaternary ammonium salt: 5-40%, surfactant 0-3%, and the balance is filler and water.

3. The inkjet transfer paper according to claim 2, characterized in that, The filler includes organic filler and inorganic filler. The organic filler includes PVDF, cationic starch, and cationic cellulose. The inorganic filler includes silica and titanium dioxide.

4. The inkjet transfer paper according to claim 1, wherein The quaternary ammonium salt is selected from one or more of polymers of methacryloyloxyethyltrimethylammonium chloride, polymers of acryloyloxyethyldimethylbenzylammonium chloride, polymers of cetyl dimethyl allyl ammonium chloride, and polymers of dimethyldiallylammonium chloride.

5. The inkjet transfer paper according to claim 1, wherein, The polyurethane layer further includes white organic pigment.

6. The inkjet transfer paper according to claim 5, characterized in that, The white organic pigment includes white polyester powder and white nylon powder.

7. A method for preparing the inkjet transfer paper according to any one of claims 2 to 6, characterized in that, It includes the following steps: Coat polyurethane on one side of the substrate layer and dry to obtain the polyurethane layer; Add aqueous polyurethane to water and stir, then add quaternary ammonium salt and surfactant and stir to obtain the ink absorption layer sizing solution, wherein the filler is added before / after the quaternary ammonium salt; Coat the ink absorption layer sizing solution on the polyurethane layer and dry to obtain the inkjet transfer paper.

8. The preparation method of the inkjet transfer paper according to claim 7, wherein, Measure the viscosity of the sizing solution with a No. 4 cup viscosimeter to be 35-60 s.

9. A transfer method for the inkjet transfer paper according to any one of claims 1 to 6, characterized in that, Print aqueous ink on the ink absorption layer side of the inkjet transfer paper, stick it to the substrate when the transfer paper is wet, hot press at a temperature of 160-250 °C, and then separate the transfer paper from the substrate. The substrate layer and the polyurethane layer and ink absorption layer without the printed pattern are peeled off from the substrate.

10. The transfer method of the inkjet transfer paper according to claim 9, characterized in that, Add white ink or transparent ink to the aqueous ink, and the aqueous ink is a disperse dye ink.

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