A reflective foaming printing material and its preparation method

Abstract

The present invention discloses a reflective foaming printing material, which comprises a base fabric and a coating material layer. The coating material layer at least contains glass microspheres, an adhesive, and a foaming agent. By introducing an aromatic hydrocarbon foaming agent to act together with the adhesive, the present invention can make the foaming microspheres formed by the foaming agent fill the surface of the gaps between the glass microspheres, avoiding the unevenness on the surface of the water-based glue and improving the reflective and aesthetic effects. Moreover, by using appropriate weight ratios of water-based polyurethane, the foaming agent, and the acrylic block copolymer, the problem of uneven distribution of the foaming microspheres can be improved, enabling the foaming microspheres to fill the gaps between the glass microspheres and achieving a smooth surface effect of the reflective material. At the same time, the metal coating accounts for 1 / 2 - 2 / 3 of the surface area of the glass microspheres, and 1 / 3 - 1 / 2 of the glass microspheres are exposed outside the adhesive. While ensuring excellent reflective effects of the reflective material, it also has excellent water resistance performance, and the glass microspheres are not easily detached after washing.

Description

Technical Field

[0001] The present invention relates to a reflective foaming printing material and a preparation method thereof, relates to G02B, and specifically relates to the field of optical element devices. Background Art

[0002] With the development of technology, people's pursuit of aesthetics in life is getting higher and higher. Simple reflective products can no longer meet people's needs. Printing on reflective materials can further improve the beauty of clothing fabrics. The rotary screen printing process has low labor intensity and high production efficiency, and is widely used in fabric printing. It can obtain lively patterns and bright colors, and can avoid the drawback of color bleeding. The existing reflective printing products have a dull surface, no sense of hierarchy, pinhole-like dots on the surface, and the overall pattern is not full, and the product grade is relatively low. Laser printing of reflective products is also a common method of reflective printing, but the pattern area of laser printing is greatly limited, and large-scale industrial operation cannot be achieved. Therefore, it is crucial to develop a printing process with good printing performance for reflective products.

[0003] Chinese invention patent CN201811017021.9 discloses an elastic reflective material and a preparation process thereof. By adjusting the hard and soft segments of polyurethane during the processing of elastic raw materials, the stability of the elastic raw materials is improved after mixing and processing, the production quality of the elastic raw materials is greatly increased, the stability of the combination with clothing is improved, and the discomfort when the reflective material contacts the skin is reduced. After processing, the elastic raw materials and the reflective materials are formed by a vacuum coating machine, which improves the overall quality of the elastic reflective material, has good uniformity, and is conducive to popularization and dissemination, but does not involve the printing of reflective materials and has low aesthetics. Chinese utility model patent CN201621407959.8 discloses a waterproof and moisture-permeable reflective cloth. By setting a waterproof and moisture-permeable coating and a waterproof and moisture-permeable composite adhesive layer on the reflective cloth, the reflective cloth can easily reach more than 3000mm water column, which basically does not affect the passage of the waterproof and moisture-permeable coating and can firmly hold the glass beads. It meets the waterproof and moisture-permeable requirements of various application scenarios and has the characteristics of strong waterproofness, wash resistance, and good air permeability. However, the waterproof and moisture-permeable composite adhesive layer is a micro-foamed open-cell hydrophilic resin layer, and the problem of uneven surface will occur on the reflective layer on the foamed composite adhesive layer, which affects the reflective effect. Summary of the Invention

[0004] In order to improve the printing effect of reflective materials and further improve the aesthetic appreciation of reflective products, the first aspect of the present invention provides a reflective foaming printing material, which sequentially includes a base cloth and a coating material layer from bottom to top. The coating material layer at least contains glass beads and foaming microspheres, and the glass beads and the foaming microspheres are distributed alternately. The glass beads are glass beads with a metal coating on the surface.

[0005] As a preferred embodiment, the raw materials for preparing the coating material layer include, by weight: 300 - 800 parts of binder, 200 - 700 parts of glass microspheres, 0 - 30 parts of pigment, 9 - 36 parts of foaming agent, 9 - 11 parts of amine additive, 15 - 20 parts of curing agent, 0 - 50 parts of consistency regulator, and 10 - 30 parts of dispersant. The brushing thickness of the coating material layer is 30 - 50 μm.

[0006] As a preferred embodiment, the glass microspheres are glass microspheres with a metal coating on the surface, and the metal coating is selected from one of silver coating, aluminum coating, gold coating, zinc coating, and chromium coating.

[0007] As a preferred embodiment, the particle size of the glass microspheres is 15 - 35 μm, the metal coating accounts for 1 / 2 - 2 / 3 of the surface area of the glass microspheres, and the thickness of the metal coating is 0 - 10 μm.

[0008] As a preferred embodiment, 1 / 3 - 1 / 2 of the glass microspheres are exposed outside the coating material.

[0009] As a preferred embodiment, the binder is selected from one of polyurethane binder or acrylate binder. The polyurethane binder is a waterborne polyurethane binder with a solid content of 35 - 45%, a pH of 6 - 9, and a viscosity of 40000 - 60000 mPa·s at 20°C.

[0010] As a preferred embodiment, the molar ratio of n(NH2 + OH) in the waterborne polyurethane binder is 25 - 70%.

[0011] As a preferred embodiment, the foaming agent is an organic foaming agent, and the organic foaming agent is selected from one or a combination of azo foaming agents, sulfonyl hydrazide foaming agents, and aromatic hydrocarbon foaming agents.

[0012] As a preferred embodiment, the foamed microspheres are semi - transparent spherical structures with a light transmittance of 5% - 60%.

[0013] As a preferred embodiment, the dispersant is an acrylic block copolymer, and the mass ratio of acrylic acid in the acrylic block copolymer is 0.8 - 3% of the mass of the entire coating material.

[0014] During the experiment, the applicant found that the printing material of the reflective water-based printing product is a thin-layer water-based glue. During the printing and drying process, the glue will shrink back, but the glass microspheres embedded in the printing layer will not shrink. Therefore, pinhole-like bubbles will appear on the surface of the printing layer due to the shrinkage of the glue after printing, and the surface will be uneven, affecting the appearance performance. Moreover, the uneven surface increases the diffuse reflection of the printing material and reduces the reflective effect of the material. The applicant found that by introducing a foaming agent into the water-based glue, the gas pressure inside the shell increases during the drying process and the thermoplastic shell softens, and the gas expands to form foamed microspheres. When cooled, the thermoplastic shell of the microspheres hardens and the volume is fixed, and the expanded part will not shrink back. The formed foamed microspheres fill the surface of the gaps between the glass microspheres, avoiding the unevenness of the water-based glue surface.

[0015] The applicant further found that the foamed microspheres formed by the water-based polyurethane added with the foaming agent are unevenly distributed and there will be an overlap of the foamed microspheres. By adding a dispersant and adjusting the addition ratios of the water-based polyurethane, the foaming agent and the acrylic block copolymer, the formed foamed microspheres can be evenly distributed and filled into the gaps between the glass microspheres to achieve the desired effect. The reason may be that the dispersant and the water-based polyurethane act together to form a coating material layer with an appropriate consistency. Due to the greater resistance at the position where the glass microspheres are located, the foaming agent can easily fill around the glass microspheres, thereby achieving the desired effect.

[0016] As a preferred embodiment, the amine-based auxiliary agent is urea. By introducing urea as an auxiliary agent, the drying speed during the printing process can be slowed down, the surface drying speed can be reduced, and the problem of dry outside and wet inside can be prevented, which affects the bonding fastness between the coating material and the base fabric. And beyond the preferred weight ratio range, the pH value of the coating material will increase, and the residue will have a corrosive effect on the metal layer.

[0017] As a preferred embodiment, the curing agent is selected from one of aziridine and isocyanate. Further preferably, the curing agent is an isocyanate curing agent. Further preferably, the curing agent is 1,6-hexamethylene diisocyanate.

[0018] As a preferred embodiment, the consistency regulator is water or a thickening agent, and the type of the thickening agent is not particularly limited. In the present application, the viscosity of the coating material layer is adjusted to 40,000-60,000 cps by the consistency regulator.

[0019] The second aspect of the present invention provides a preparation method of a reflective foamed printing material, comprising the following steps:

[0020] (1) Weigh the raw materials for preparing the coating material by weight parts, mix them evenly, and prepare the coating material;

[0021] (2) Transfer the coating material to the base fabric using a rotary screen printing machine;

[0022] (3) Drying and foaming, followed by winding to obtain the product.

[0023] As a preferred embodiment, the parameters set for the rotary screen printing machine are as follows: the mesh count of the nickel screen is 50 - 200 meshes, the length of the magnetic rod is 5 - 15 μm. The specific operation of step 2 is as follows: during transfer, the tilt angle of the knife edge is 15 - 30°.

[0024] The coating material in this application contains a large number of powder particles. A rotary screen printing machine with a 50 - 200 - mesh nickel screen can select the nickel screen aperture according to different patterns; using a magnetic rod with a length of 5 - 15 μm can improve the clarity of the printed pattern. For substrates with relatively deep cloth patterns, a magnetic rod with knurling is required; when the tilt angle of the knife edge is 15 - 30°, it can ensure complete slurry collection, and the magnetic rod pressure is selected according to the density of the substrate. The magnetic rod is mainly inside the rotary screen and adheres firmly to the magnetic table through magnetic force, and the magnetic force can also be controlled to achieve different degrees of force. By extrusion and rotation, the glue comes out of the holes of the rotary screen and is printed onto a specific substrate.

[0025] As a preferred embodiment, the difference between the rotation speed of the rotary screen and the unwinding speed of the substrate is 0 - 2%.

[0026] The speed difference is mainly due to the tension fluctuation during winding or unwinding, resulting in an error in the rotation speeds of the substrate and the rotary screen. Therefore, it is necessary to ensure that the tension before and after printing is not too large. When the speed difference is large, the substrate will pull the screen and cause the screen to break; when the speed difference is small, the pattern will have tailing, the pattern will not be clear, and the edge contour will be blurred.

[0027] As a preferred embodiment, the specific operation of step 3 is as follows: the drying temperature is 130 - 150 °C, the drying vehicle speed is 10 - 15 m / min; after drying, it is cured in an environment of 40 - 60 °C for 24 - 72 h.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) For the reflective foaming printing material of the present invention, by introducing an aromatic hydrocarbon foaming agent and acting together with the binder, the foaming microspheres formed by the foaming agent can be filled on the surface of the gaps between the glass microspheres, avoiding the unevenness on the surface of the water - based glue and improving the reflective and aesthetic effects.

[0030] (2) For the reflective foaming printing material of the present invention, the weight ratio of water - based polyurethane, foaming agent, and acrylic block copolymer is (30 - 80):(0.5 - 4):(1 - 3), which can improve the problem of uneven distribution of foaming microspheres, enable the foaming microspheres to fill into the gaps between the glass microspheres, and achieve the effect of a smooth surface of the reflective material.

[0031] (3) In the reflective foaming printing material of the present invention, the metal coating accounts for 1 / 2 - 2 / 3 of the surface area of the glass microspheres, and 1 / 3 - 1 / 2 of the glass microspheres are exposed outside the adhesive. While ensuring excellent reflective effect of the reflective material, it also has excellent water resistance performance, and the glass microspheres are not easily detached after washing. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the foaming reflective product structure of the present invention.

[0033] In the figure: 1. Coating material layer; 2. Adhesive layer; 3. Base fabric; 4. Metal coating; 5. Glass microspheres; 6. Foaming microspheres. DETAILED DESCRIPTION OF THE INVENTION

[0034] Example 1

[0035] See Figure 1 : A reflective foaming printing material, which successively includes a base fabric 3 and a coating material layer 1 from bottom to top. The coating material layer 1 at least contains glass microspheres 5 and foaming microspheres 6, and the glass microspheres 5 and the foaming microspheres 6 are distributed alternately.

[0036] The preparation raw materials of the coating material layer include, by weight: 500 parts of adhesive, 400 parts of glass microspheres, 10 parts of pigment, 25 parts of foaming agent, 10 parts of amine auxiliary agent, 17 parts of curing agent, 25 parts of consistency regulator, and 20 parts of dispersant.

[0037] The coating material layer 1 includes an adhesive layer 2, glass microspheres 5, a metal coating 4, and foaming microspheres 6. The foaming microspheres 6 are interspersed among the glass microspheres 5.

[0038] The glass microspheres 5 are glass microspheres with a metal aluminum coating on the surface. The particle size of the glass microspheres is 25 μm, the metal coating 4 accounts for 1 / 2 of the surface area of the glass microspheres, and the thickness of the metal coating is 5 μm.

[0039] 1 / 2 of the glass microspheres are exposed outside the coating material.

[0040] The adhesive is a waterborne polyurethane adhesive, with a solid content of 40%, a pH of 8, a viscosity of 40000 - 60000 mPa·s, and the molar ratio of (NH2 + OH) in the waterborne polyurethane adhesive is 60%. It is purchased from Anhui Anda Huatai New Materials Co., Ltd., and the model is AH - 1604H.

[0041] The foaming agent is a polystyrene foaming agent, purchased from Dongguan Hongding New Materials Co., Ltd., and the model is Expancel 198.

[0042] The dispersant is an acrylic block copolymer, and the molar proportion of acrylic acid in the acrylic block copolymer is 2%. It is purchased from Foshan Yuehuahe Technology Co., Ltd. and the model is H-1900W.

[0043] The amine auxiliary agent is urea, and the curing agent is 1,6-hexamethylene diisocyanate.

[0044] The consistency regulator is water.

[0045] A preparation method of a reflective foaming printing material includes the following steps:

[0046] (1) Weigh the raw materials for preparing the coating material by weight parts, mix and stir evenly to obtain the coating material, and adjust the viscosity of the coating material layer to 50000 cps;

[0047] (2) Transfer the coating material to the base fabric using a rotary screen printing machine;

[0048] (3) Dry and foam, and then wind up to obtain.

[0049] In the rotary screen printing machine, the mesh number of the nickel screen is 100 meshes, the length of the magnetic bar is 10 μm. When transferring in step 2, the inclination angle of the knife edge is 20°. The difference between the rotation speed of the rotary screen and the unwinding speed of the base material is 1%.

[0050] In step 3, the drying temperature is 140 °C, and the drying vehicle speed is 13 m / min; after drying, it is cured in an environment of 50 °C for 36 h.

[0051] Example 2

[0052] A reflective foaming printing material includes a base fabric 3 and a coating material layer 1. The raw materials for preparing the coating material layer include, by weight parts: 400 parts of binder, 300 parts of glass microspheres, 5 parts of pigment, 10 parts of foaming agent, 9 parts of amine auxiliary agent, 15 parts of curing agent, 5 parts of consistency regulator, and 10 parts of dispersant.

[0053] The coating material layer 1 includes an adhesive layer 2, glass microspheres 5, a metal coating layer 4, and foaming microspheres 6. The foaming microspheres 6 are interspersed among the glass microspheres 5.

[0054] The glass microspheres 5 are glass microspheres with a metal aluminum coating on the surface. The particle size of the glass microspheres is 15 μm. The metal coating layer 4 accounts for 1 / 2 of the surface area of the glass microspheres, and the thickness of the metal coating layer is 5 μm.

[0055] 1 / 3 of the glass microspheres are exposed outside the coating material.

[0056] The adhesive is a water-based polyurethane adhesive with a solids content of 40%, a pH of 8, and a viscosity of 40,000-60,000 mPa·s. The molar ratio of (NH₂ + OH) in the water-based polyurethane adhesive is 60%. It was purchased from Anhui Anda Huatai New Materials Co., Ltd., model number AH-1604H.

[0057] The foaming agent is a polystyrene foaming agent purchased from Guangzhou Benqi New Materials Co., Ltd., model CS-225.

[0058] The dispersant is an acrylic acid block copolymer, in which the molar ratio of acrylic acid is 2%, purchased from Foshan Yuehuahe Technology Co., Ltd., model number H-1900W.

[0059] The amine auxiliary agent is urea, and the curing agent is 1,6-hexamethylene diisocyanate.

[0060] The consistency regulator is water.

[0061] A method for preparing a reflective foaming printing material comprises the following steps:

[0062] (1) Weigh the raw materials for preparing the coating material according to parts by weight, mix and stir evenly to prepare the coating material, and adjust the viscosity of the coating material layer to 50,000 cps;

[0063] (2) Transfer the coating material to the base fabric using a rotary screen printing machine;

[0064] (3) Dry and foam, then roll up.

[0065] The mesh size of the nickel screen in the rotary screen printing machine is 80 mesh, the length of the magnetic rod is 7 μm, and the inclination angle of the blade during the transfer in step 2 is 30°. The difference between the rotation speed of the rotary screen and the unwinding speed of the substrate is 0.5%.

[0066] In step 3, the drying temperature is 120° C. and the drying speed is 10 m / min; after drying, the mixture is cured in an environment of 40° C. for 72 hours.

[0067] Example 3

[0068] A reflective foaming printing material comprises a base fabric 3 and a coating material layer 1. The raw materials for preparing the coating material layer include, by weight, 800 parts of an adhesive, 700 parts of glass microbeads, 30 parts of a pigment, 36 parts of a foaming agent, 11 parts of an amine auxiliary agent, 20 parts of a curing agent, 45 parts of a consistency regulator, and 30 parts of a dispersant.

[0069] The coating material layer 1 includes an adhesive layer 2, glass microspheres 5, a metal plating layer 4 and foamed microspheres 6. The foamed microspheres 6 are interspersed among the glass microspheres 5.

[0070] The glass microspheres 5 are glass microspheres with a metal aluminum coating on the surface. The particle size of the glass microspheres is 30 μm. The metal coating 4 accounts for 2 / 3 of the surface area of the glass microspheres, and the thickness of the metal coating is 8 μm.

[0071] Half of the glass microspheres are exposed outside the coating material.

[0072] The binder is a waterborne polyurethane binder with a solid content of 40%, a pH of 8, a viscosity of 40000 - 60000 mPa·s, and the molar ratio of (NH2 + OH) in the waterborne polyurethane binder is 60%. It is purchased from Anhui Anda Huatai New Materials Co., Ltd., and the model is AH - 1604H.

[0073] The foaming agent is a polystyrene foaming agent, purchased from Guangzhou Benqi New Materials Co., Ltd., and the model is CS - 225.

[0074] The dispersant is an acrylic block copolymer, and the molar ratio of acrylic acid in the acrylic block copolymer is 2%. It is purchased from Foshan Yuehuahe Technology Co., Ltd., and the model is H - 1900W.

[0075] The amine - type auxiliary agent is urea, and the curing agent is 1,6 - hexamethylene diisocyanate.

[0076] The consistency regulator is water.

[0077] A preparation method of a reflective foaming printing material includes the following steps:

[0078] (1) Weigh the raw materials for preparing the coating material by weight parts, mix them evenly, prepare the coating material, and adjust the viscosity of the coating material layer to 60000 cps;

[0079] (2) Transfer the coating material to the base fabric using a rotary screen printing machine;

[0080] (3) Dry and foam, and then wind it up to obtain the product.

[0081] In the rotary screen printing machine, the mesh number of the nickel screen is 180 meshes, the length of the magnetic bar is 15 μm. When transferring in step 2, the inclination angle of the blade is 10°. The difference between the rotation speed of the rotary screen and the unwinding speed of the base material is 1.5%.

[0082] In step 3, the drying temperature is 150 °C, and the drying vehicle speed is 15 m / min; after drying, it is cured in an environment of 60 °C for 24 h.

[0083] Example 4

[0084] A reflective foaming printing material and its preparation method, the specific steps are the same as those in Example 1, the difference is that it does not contain a foaming agent.

[0085] Example 5

[0086] A reflective foaming printing material and its preparation method. The specific steps are the same as those in Example 1, except that the raw materials for preparing the coating material layer include, by weight: 500 parts of binder, 400 parts of glass microspheres, 10 parts of pigment, 40 parts of foaming agent, 10 parts of amine auxiliary agent, 17 parts of curing agent, 25 parts of consistency regulator, and 35 parts of dispersant.

[0087] Performance Test

[0088] 1. Color fastness test: Test according to the soaping color fastness test: GB / T3921, and the laundry detergent is anhydrous sodium carbonate. ① Sample preparation requirements: The product size is not less than 40mm×100mm, and two samples are taken from different parts in the wide width.

[0089] ② Test requirements: The textile sample is sewn together with the standard cotton and polyester lining fabrics, placed in a mixed solution of soap solution and anhydrous sodium carbonate, mechanically agitated in a solution with a bath ratio of 50:1 under the specified conditions of 30min and 40°C, and then washed and dried.

[0090] Using the original sample as the reference sample, evaluate the color change of the sample and the staining of the lining fabric with a gray scale or instrument.

[0091] 2. Washing fastness test: ① Sample preparation requirements: The sample size is 5×25cm, and one sample is taken from the left, middle, and right of the wide width of the retained sample.

[0092] ② Sewing requirements: It needs to be sewn on the current conventional 30×30cm base fabric. Two samples are sewn on each base fabric, with a 5cm interval and 5cm from the edge. When sewing, one fold is sewn in the middle of the sample strip, and the folding part is controlled at about 1cm.

[0093] ③ Washing method: Refer to ISO 6330 4N

[0094] Water hardness: <0.7mmol / l

[0095] Detergent: ECE detergent 20g / time

[0096] Washing machine: Siemens household drum washing machine

[0097] Washing procedure: 60°C, 1 hour for each wash

[0098] When the water hardness is higher than the required value, deionized water and an appropriate amount of calcium chloride are used to adjust the hardness to the required range.

[0099] 3. Reflective brightness test: Use a 932 retroreflectometer to test the retroreflective coefficient under the condition of an incident angle of 5° and a reflection angle of 0.2°.

[0100] The test results are shown in Table 1.

[0101] Table 1

[0102]

Claims

1. A reflective foamed printing material, characterized in that, It includes a base fabric and a coating material layer from bottom to top. At least glass microspheres and foamed microspheres are included in the coating material layer, and the glass microspheres and the foamed microspheres are distributed alternately. The glass microspheres are glass microspheres with a metal aluminum coating on the surface. The preparation raw materials of the coating material layer include, by weight: 500 parts of binder, 200 - 700 parts of glass microspheres, 0 - 30 parts of pigment, 25 parts of foaming agent, 9 - 11 parts of amine additive, 15 - 20 parts of curing agent, 0 - 50 parts of consistency regulator, and 20 parts of dispersant. Or the preparation raw materials of the coating material layer include, by weight: 400 parts of binder, 200 - 700 parts of glass microspheres, 0 - 30 parts of pigment, 10 parts of foaming agent, 9 - 11 parts of amine additive, 15 - 20 parts of curing agent, 0 - 50 parts of consistency regulator, and 10 parts of dispersant. Or the preparation raw materials of the coating material layer include, by weight: 800 parts of binder, 200 - 700 parts of glass microspheres, 0 - 30 parts of pigment, 36 parts of foaming agent, 9 - 11 parts of amine additive, 15 - 20 parts of curing agent, 0 - 50 parts of consistency regulator, and 30 parts of dispersant. The brushing thickness of the coating material layer is 30 - 50 μm. The foamed microspheres are semi - transparent spherical structures, and the light transmittance is 5% - 60%. The dispersant is an acrylic block copolymer, and the mass proportion of acrylic acid in the acrylic block copolymer is 0.8 - 3% of the mass of the whole coating material. The binder is a water - borne polyurethane binder, with a solid content of 40%, a pH of 8, a viscosity of 40000 - 60000 mPa·s, and the molar proportion of (NH2 + OH) in the water - borne polyurethane binder is 60%. The foaming agent is a polystyrene foaming agent. The preparation method of the reflective foamed printing material includes the following steps: (1) Weigh the preparation raw materials of the coating material by weight, mix them evenly, and obtain the coating material. (2) Transfer the coating material onto the base fabric using a rotary screen printing machine. (3) Dry and foam, and then wind it up to obtain the product.

2. The reflective foaming printing material according to claim 1, characterized in that The particle size of the glass microspheres is 15 - 35 μm, the metal coating accounts for 1 / 2 - 2 / 3 of the surface area of the glass microspheres, and the thickness of the metal coating is 0 - 10 μm.

3. A method for preparing the reflective foaming printing material according to any one of claims 1-2, characterized in that, It includes the following steps: (1) Weigh the preparation raw materials of the coating material by weight, mix them evenly, and obtain the coating material. (2) Transfer the coating material onto the base fabric using a rotary screen printing machine. (3) Dry and foam, and then wind it up to obtain the product.

4. The preparation method of the reflective foaming printing material according to claim 3, characterized in that, The parameters set for the rotary screen printing machine are: the mesh number of the nickel screen is 50 - 200 meshes, the length of the magnetic bar is 5 - 15 μm. The specific operation of step 2 is: when transferring, the inclination angle of the knife edge is 15 - 30°.

5. The preparation method of the reflective foaming printing material according to claim 3, wherein, The specific operation of step 3 is: the drying temperature is 130 - 150 °C, and the drying vehicle speed is 10 - 15 m / min.

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