A kind of bright reflective printing material and preparation method thereof

Abstract

The present invention discloses a brightened reflective printing material, comprising a composite adhesive and a substrate, wherein the composite adhesive encapsulates glass microbeads, aluminum paste, and pigment. The present invention utilizes an aluminum paste containing polyether siloxane in conjunction with a water-based polyurethane adhesive to form a uniform and stable adhesive system with evenly distributed silica and glass microbeads, thereby obtaining a reflective printing coating with a uniform reflective effect. This material overcomes the bottom exposure phenomenon of rotary screen reflective printing, resulting in a brighter and more delicate overall appearance. This addresses the problems of poor appearance, dull and rough surfaces, and darkening surfaces under natural light in existing reflective products. Furthermore, the area of ​​the metal layer encapsulated on the surface of the glass microbeads is 0.2 / 3 of the surface area of ​​the glass microbeads, while the exposed area of ​​the metal layer in the composite adhesive is 1.1 / 2, resulting in excellent water-wash resistance of the printing layer.

Description

Technical Field

[0001] The present invention relates to a brightening reflective printing material and a preparation method thereof, and relates to G02B, in particular to the field of optical element equipment. Background Art

[0002] With the development of society and the improvement of people's living standards, ordinary reflective products can no longer meet people's needs. Reflective materials with beautiful appearance and lively shapes are becoming more and more popular. Printing on reflective products can improve the aesthetics of reflective products and increase their appeal. Rotary screen printing has low labor intensity, high production efficiency, and strong printing performance on fabrics. Therefore, it is widely used in the printing of fabric products. The patterns formed by existing reflective printing products are dark in surface, with poor layering, and there are many needle-like holes distributed on the pattern surface, which reduces the grade of the product. The present invention has developed a brightening reflective printing material that can reduce the needle-like micropores in the printed pattern while increasing the reflective brightness and significantly improving the aesthetics.

[0003] Chinese invention patent CN201510526240.X discloses a patterned reflective fabric and its preparation method. The fabric comprises a geometrically shaped composite adhesive layer between a base fabric and a coating, a focusing layer atop the coating, and glass microbeads atop the focusing layer. The geometric shapes are the desired graphics and fonts. The resulting fabric can be used as outdoor fabric, combining aesthetics, warning features, and waterproof and windproof properties. However, the fabric suffers from poor washability, significantly reducing its reflective effect after washing. Chinese invention patent CN201510527028.5 discloses a high-efficiency, wide-width, breathable patterned reflective material and its preparation method. The fabric comprises a geometrically shaped hot-melt adhesive layer between a base fabric and a coating, a focusing layer atop the coating, and glass microbeads atop the focusing layer. This material not only provides a reflective warning function but also offers novel designs, available in a variety of patterns and colors. The aesthetically pleasing reflective pattern is achieved through the changing shape of the adhesive layer. However, the reflective material is coated throughout the entire fabric, which will reduce the softness of the fabric and reduce the breathability and comfort of the clothing fabric. Summary of the Invention

[0004] In order to improve the aesthetics of reflective materials, achieve printing effects, and at the same time make them have excellent water-washing resistance and improve the overall use effect, the first aspect of the present invention provides a brightening reflective printing material, including a composite adhesive and a substrate, wherein the composite adhesive wraps glass beads, aluminum paste, and pigment.

[0005] As a preferred embodiment, the glass microbeads are glass microbeads with metal layers wrapped on the surface, the wrapped area of ​​the metal layers on the glass microbead surface is 0-2 / 3 of the surface area of ​​the glass microbeads, and the exposed area of ​​the metal layers in the composite adhesive is 1-1 / 2.

[0006] As a preferred embodiment, the material of the metal layer is selected from one of Al, Ag, Cu, Zn, Gr, and ZnS. The thickness of the metal layer is 5-10 μm. More preferably, the thickness of the metal layer is 9 μm.

[0007] As a preferred embodiment, the raw materials for preparing the composite adhesive include, by weight, 300-800 parts of main glue, 15-20 parts of curing agent, 5-15 parts of retarder, 10-30 parts of acrylic block copolymer, 0-50 parts of thickener, and 0-50 parts of water.

[0008] As a preferred embodiment, the glass microbeads, aluminum paste, and pigment are mixed into the composite adhesive in the following proportions: 200-700 parts of glass microbeads, 0-30 parts of pigment, and 5-20 parts of aluminum paste.

[0009] As a preferred embodiment, the main adhesive is selected from one or a combination of polyurethane adhesive, acrylate adhesive, epoxy resin adhesive, organic silicone adhesive, polyamide adhesive, and polyvinyl alcohol adhesive.

[0010] As a preferred embodiment, the polyurethane adhesive has a solid content of 45-55%, a viscosity of 500-800 mPa.s at 20° C., and a pH value of 7-9.

[0011] As a preferred embodiment, the acrylic block copolymer has a solid content of 45-55% and an amine value of 18-22 mg KOH / g.

[0012] As a preferred embodiment, the curing agent is an isocyanate curing agent or an aziridine curing agent. More preferably, the curing agent is 1,6-hexamethylene diisocyanate.

[0013] As a preferred embodiment, the slow-drying agent is urea.

[0014] In this application, the retarder and isocyanate curing agent work together to control the curing speed of the composite adhesive, appropriately extending the curing time and facilitating production operations. Furthermore, the retarder and isocyanate curing agent work together to prevent the coating from drying out on the outside and getting wet on the inside, thereby increasing the fastness of the glass microspheres in the composite adhesive and improving its washability.

[0015] As a preferred embodiment, the aluminum paste comprises at least the following by weight percentage: 5-15% aluminum flakes, 0-2% silicon dioxide, and the balance of polyether siloxane.

[0016] As a preferred embodiment, the particle size of the aluminum flakes is 10-100 μm, and the particle size of the silicon dioxide is 15-50 nm.

[0017] The aluminum paste in this application is a water-based aluminum-silver paste, which has a good dispersion effect in water-based polyurethane and uses aluminum flakes of 10-100 μm. It has high covering power, good adhesion, strong metallic feel, and can produce fine silver, imitation electroplated silver, and flash silver effects. The color is different depending on the angle.

[0018] During experiments, the applicant discovered that a printed coating prepared using an aluminum paste containing aluminum flakes, silica, and polyether siloxane can achieve excellent reflective viewing effects and solve the problem of surface pinholes after the printed coating is dried and cured. The aluminum paste has good compatibility with the adhesive, and the resulting printed system is uniform and stable. Possible reasons for this are speculated to be: the good compatibility of polyether siloxane with the water-based polyurethane adhesive forms a uniform and stable system; the polyether structure in the polyether siloxane has good hydrophilicity and can be evenly dispersed in the water-based polyurethane adhesive, allowing the silica and aluminum flakes to be evenly dispersed in the polyurethane adhesive. When the adhesive is applied and cured, the silica and aluminum flakes disperse into the softened portions of the adhesive. After drying, the presence of silica and aluminum flakes prevents shrinkage of the adhesive, thereby preventing the formation of pinholes on the surface of the printed coating and improving the surface effect. At the same time, the dispersion of aluminum flakes in the softened part of the adhesive can form an aluminum reflective layer, which works together with the glass beads and the aluminum coating on the surface of the glass beads to expand the reflective area, extend the reflective path, increase the brightness of the reflective printing, and further improve the reflective effect.

[0019] The aluminum flakes in the aluminum paste of the present application are evenly distributed in the composite adhesive, distributed on the surface and / or inside. When distributed on the surface of the composite adhesive, they can form a mirror structure, which works together with the glass beads and metal layers to improve the reflective brightness.

[0020] A second aspect of the present invention provides a method for preparing a bright reflective printed material, comprising the following steps:

[0021] (1) mixing raw materials for preparing a composite adhesive to prepare a composite adhesive;

[0022] (2) mixing and encapsulating the composite adhesive with glass beads, aluminum paste, and pigment;

[0023] (3) The wrapped composite adhesive is coated with a rotary screen printing machine, dried, and solidified, and then left to stand for 40-60 hours.

[0024] As a preferred embodiment, the viscosity of the composite adhesive at 25° C. is 40,000-60,000 Pa.s.

[0025] As a preferred embodiment, the drying temperature is 100-130° C., the drying time is 5-105 s, and the drying speed is 10-40 m / min.

[0026] As a preferred embodiment, the mesh number of the nickel screen in the rotary screen printing machine is 50-150 meshes, the length of the magnetic rod is 8-12 μm, and the inclination angle of the blade during production is 15-30°.

[0027] As a preferred embodiment, the product is placed in an environment with a temperature of 50-60° C. and a humidity of 20-90% after processing.

[0028] As a preferred embodiment, the retroreflection coefficient of the product is 1-50 cd·lX -1 ·m -2 , further preferably, the retroreflection coefficient of the product is 5-10cd·lX -1 ·m -2 .

[0029] The rotary screen printing machine of the present invention can obtain printed products with high pattern clarity and delicate patterns under the optimal processing parameters, and during processing, the pulp collection degree is high and the printing residue is small.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The brightening reflective printing material of the present invention uses aluminum paste containing polyether siloxane and water-based polyurethane adhesive to form a uniform and stable adhesive system with uniform distribution of silica and glass beads, thereby obtaining a reflective printing coating with uniform reflective effect.

[0032] (2) The brightened reflective printing material of the present invention, by introducing silicon dioxide and aluminum flakes into the aluminum paste, can not only improve the reflective brightness of the reflective printing layer, but also reduce the surface porosity problem of the printing layer after drying, thereby further improving the reflective effect.

[0033] (3) The brightened reflective printing material of the present invention makes up for the bottom exposure phenomenon of rotary screen reflective printing, making the overall appearance brighter and more delicate, and solving the problems of poor appearance, dull surface, rough surface, and dark surface under natural light in existing reflective products. In addition, the wrapped area of ​​the metal layer on the surface of the glass microbeads is 0-2 / 3 of the surface area of ​​the glass microbeads, and the exposed area of ​​the metal layer in the composite adhesive is 1-1 / 2, so that the printing layer has excellent water wash resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural diagram of the bright reflective printing material of the present invention;

[0035] Figure 2 This is the effect of Example 2 of the present invention without the flash;

[0036] Figure 3 This is the effect of turning on the flashlight in Example 2 of the present invention;

[0037] Figure 4 The effect of Example 1 of the present invention without the flash, from left to right: before cleaning, after washing 15 times, and after washing 25 times;

[0038] Figure 5 The effect of turning on the flashlight in Example 1 of the present invention, from left to right: before cleaning, after washing 15 times, and after washing 25 times;

[0039] Figure 6 This is the effect of the embodiment of the present invention without turning on the flash, from left to right: embodiment 3, embodiment 1;

[0040] Figure 7 This is the effect of turning on the flashlight in the embodiments of the present invention, from left to right: Embodiment 3, Embodiment 1.

[0041] In the figure: 1. Aluminum paste; 2. Glass beads; 3. Metal layer; 4. Composite adhesive; 5. Base material. DETAILED DESCRIPTION

[0042] Example 1

[0043] A brightening reflective printing material comprises a composite adhesive 4 and a base material 5, wherein the composite adhesive wraps glass microbeads 2, aluminum paste 1, and pigment.

[0044] The glass microbeads are glass microbeads with metal layers 3 wrapped on their surfaces. The area of ​​the metal layers wrapped on the glass microbeads is 2 / 3 of the surface area of ​​the glass microbeads, and the exposed area of ​​the metal layers 3 in the composite adhesive 4 is 1 / 2.

[0045] The metal layer 3 is made of Al and has a thickness of 9 μm.

[0046] The raw materials for preparing the composite adhesive 4 include, by weight, 500 parts of main adhesive, 17 parts of curing agent, 10 parts of retarder, 20 parts of acrylic block copolymer, 25 parts of thickener, and 5 parts of water.

[0047] The weight ratio of glass microbeads, aluminum paste and pigment mixed into the composite adhesive is 500 parts of glass microbeads, 15 parts of pigment and 15 parts of aluminum paste.

[0048] The polyurethane adhesive has a solid content of 50%, a viscosity of 500-800 mPa.s at 20° C., and a pH value of 7-9. It was purchased from Anhui Anda Huatai New Materials Co., Ltd. and has a model number of AH-1604H.

[0049] The acrylic block copolymer has a solid content of 50% and an amine value of 19 mg KOH / g and is purchased from BASF with a model number of PX4310.

[0050] The curing agent is 1,6-hexamethylene diisocyanate, and the slow-drying agent is urea.

[0051] The thickener was purchased from Zhejiang Chuanhua Chemical Group, model number TF-313C.

[0052] The aluminum paste comprises at least 10% aluminum flakes, 1% silicon dioxide, and the balance of polyether siloxane in weight percentage. The particle size of the aluminum flakes is 10-100 μm, and the particle size of the silicon dioxide is 15-50 nm. The aluminum paste is purchased from Ruike Chemical Co., Ltd.

[0053] A method for preparing a bright reflective printing material comprises the following steps:

[0054] (1) mixing raw materials for preparing a composite adhesive to prepare a composite adhesive;

[0055] (2) mixing and encapsulating the composite adhesive with glass beads, aluminum paste, and pigment;

[0056] (3) The wrapped composite adhesive is coated with a rotary screen printing machine, dried, solidified, and allowed to stand for 48 hours.

[0057] The viscosity of the composite adhesive at 25° C. is adjusted to 50,000 Pa.s using a thickener and water.

[0058] The drying temperature is 120° C., the drying time is 55 s, and the drying speed is 25 / min.

[0059] The mesh number of the nickel screen in the rotary screen printing machine is 100 meshes, the diameter of the magnetic rod is 10 mm, and the inclination angle of the blade during production is 23°.

[0060] Example 2

[0061] A brightening reflective printing material comprises a composite adhesive 4 and a base material 5. The composite adhesive 4 wraps glass microbeads 2, aluminum paste 1, and pigment.

[0062] The glass microbeads 2 are glass microbeads with metal layers 3 wrapped on their surfaces. The area of ​​the metal layers 3 wrapped on the glass microbead surfaces is 1 / 2 of the glass microbead surface area, and the exposed area of ​​the metal layers 3 in the composite adhesive is 1 / 2.

[0063] The metal layer 3 is made of Al and has a thickness of 9 μm.

[0064] The raw materials for preparing the composite adhesive 4 include, by weight, 700 parts of main adhesive, 19 parts of curing agent, 15 parts of retarder, 30 parts of acrylic block copolymer, 45 parts of thickener, and 10 parts of water.

[0065] The weight proportions of glass microbeads, aluminum paste and pigment mixed into the composite adhesive are 550 parts of glass microbeads, 20 parts of pigment and 15 parts of aluminum paste.

[0066] The polyurethane adhesive has a solid content of 50%, a viscosity of 500-800 mPa.s at 20° C., and a pH value of 7-9. It was purchased from Anhui Anda Huatai New Materials Co., Ltd. and has a model number of AH-1604H.

[0067] The acrylic block copolymer has a solid content of 50% and an amine value of 19 mg KOH / g and is purchased from BASF with a model number of PX4310.

[0068] The curing agent is 1,6-hexamethylene diisocyanate, and the slow-drying agent is urea.

[0069] The thickener was purchased from Zhejiang Chuanhua Chemical Group, model number TF-313C.

[0070] The aluminum paste comprises at least 10% aluminum flakes, 1% silicon dioxide, and the balance of polyether siloxane in weight percentage. The particle size of the aluminum flakes is 10-100 μm, and the particle size of the silicon dioxide is 15-50 nm. The aluminum paste is purchased from Ruike Chemical Co., Ltd.

[0071] A method for preparing a bright reflective printing material comprises the following steps:

[0072] (1) mixing raw materials for preparing a composite adhesive to prepare a composite adhesive;

[0073] (2) mixing and encapsulating the composite adhesive with glass beads, aluminum paste, and pigment;

[0074] (3) The wrapped composite adhesive is coated with a rotary screen printing machine, dried, and solidified, and then left to stand for 40-60 hours.

[0075] The viscosity of the composite adhesive at 25° C. is adjusted to 50,000 Pa.s using a thickener and water.

[0076] The drying temperature is 130° C., the drying time is 40 seconds, and the drying speed is 30 m / min.

[0077] The mesh number of the nickel screen in the rotary screen printing machine is 135 meshes, the diameter of the magnetic rod is 12 mm, and the inclination angle of the blade during production is 25°.

[0078] Example 3

[0079] A brightening reflective printing material and a preparation method thereof, wherein the specific steps are the same as those in Example 1, except that the material does not contain aluminum paste.

[0080] Example 4

[0081] A brightening reflective printing material and a preparation method thereof, wherein the specific steps are the same as those in Example 1, except that the curing agent is aziridine.

[0082] Example 5

[0083] A brightening reflective printing material and a preparation method thereof, wherein the specific steps are the same as those of Example 1, except that the area of ​​the metal layer wrapped on the surface of the glass microbeads is 1 / 3 of the surface area of ​​the glass microbeads, and the exposed area of ​​the metal layer in the composite adhesive is 2 / 3.

[0084] Performance Testing

[0085] 1. Color fastness test: Test according to the soap color fastness test: GB / T3921, and the laundry detergent is anhydrous sodium carbonate.

[0086] 2. Washing fastness test: 60℃ fastness washing, use household detergent to wash in 60℃ water temperature, each washing time is 1 hour.

[0087] 3. Reflective brightness test: Use 932 retroreflectometer to test, with the incident angle of 5° and the reflection angle of 0.2°, to test the retroreflection coefficient.

[0088] The test results are shown in Table 1.

[0089] Table 1

[0090] Color fastness test 25 wash fastness tests Reflective brightness test Example 1 Level 4 The pattern is basically clear and without stratification 12 Example 2 Level 4 The pattern is basically clear and without stratification 8 Example 3 Level 4 Brightness dims and beads fall off 5 Example 4 Level 3 Brightness dims and beads fall off 6 Example 5 Level 4 The pattern is basically clear and without stratification 10

Claims

1. A bright reflective printing material, characterized in that: The invention comprises a composite adhesive and a substrate, wherein the composite adhesive wraps glass microbeads, aluminum paste, and pigment, wherein the aluminum paste and glass microbeads are distributed continuously or staggered in the composite adhesive, and the aluminum paste is distributed inside or on the surface of the composite adhesive; The raw materials for preparing the composite adhesive include, by weight, 300-800 parts of main adhesive, 15-20 parts of curing agent, 5-15 parts of slow-drying agent, 10-30 parts of acrylic block copolymer, 0-50 parts of thickener, and 0-50 parts of water; The curing agent is 1,6-hexamethylene diisocyanate; The aluminum paste comprises at least 5-15% aluminum flakes, 0-2% silicon dioxide, and the balance of polyether siloxane in terms of weight percentage; The particle size of the aluminum flakes is 10-100 μm, and the particle size of the silicon dioxide is 15-50 nm; The glass microbeads are glass microbeads with metal layers wrapped on their surfaces. The area of ​​the metal layers wrapped on the glass microbead surfaces is 0-2 / 3 of the surface area of ​​the glass microbeads, and the exposed area of ​​the metal layers in the composite adhesive is 1-1 / 2.

2. The highlight reflective printing material according to claim 1, characterized in that: The main adhesive is selected from one or a combination of polyurethane adhesive, acrylic adhesive, epoxy resin adhesive, organic silicone adhesive, polyamide adhesive, and polyvinyl alcohol adhesive.

3. The highlight reflective printing material according to claim 2, characterized in that: The polyurethane adhesive has a solid content of 45-55%, a viscosity of 500-800 mPa.s at 20° C., and a pH value of 7-9.

4. The highlight reflective printing material according to claim 1, characterized in that: The acrylic block copolymer has a solid content of 45-55% and an amine value of 18-22 mg KOH / g.

5. A method for preparing the bright reflective printing material according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) mixing raw materials for preparing a composite adhesive to prepare a composite adhesive; (2) mixing and encapsulating the composite adhesive with glass beads, aluminum paste, and pigment; (3) The wrapped composite adhesive is coated with a rotary screen printing machine, dried, and solidified, and then left to stand for 40-60 hours.

6. The method for preparing the bright reflective printing material according to claim 5, characterized in that: The drying temperature is 100-130° C., the drying time is 5-105 seconds, and the drying speed is 10-40 m / min.

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