Bright silver bead planting film for reflective fabric and preparation method of bright silver bead planting film

Abstract

The invention relates to the technical field of reflective cloth, in particular to a bright silver bead planting film for reflective cloth and a preparation method of the bright silver bead planting film. The first transparent protective layer (1), the second transparent protective layer (2), the glass bead layer (3), the water-based focusing layer (4) and the metal coating (5) are fixedly connected in sequence from bottom to top. The water-based focusing layer uses water as a solvent and is non-toxic and environment-friendly; no organic solvent is used in the production process of the bright silver bead planting film, the workshop operation environment is greatly improved, and the bright silver bead planting film is odorless, friendly to workers, capable of improving the production efficiency and free of flammable and explosive risks.

Description

Technical Field

[0001] The invention relates to the technical field of reflective cloth, and in particular to a bright silver bead-embedded film for reflective cloth and a preparation method thereof. Background Art

[0002] Reflective fabric is a high-tech product that is widely used in products that are closely related to the safety of life and property, such as uniforms, work clothes, protective clothing, etc. Reflective fabric is made by focusing treatment based on the retro-reflective principle of high-refractive glass beads as reflective elements. Its application in the field of personal safety protection is becoming more and more extensive, and the economic and social benefits it generates are becoming more and more obvious. At present, in the field of reflective fabric, there are deviations in brightness and color difference in different areas of the entire reflective product. The reason is due to the technical differences in the existing coating methods in the reflective industry. There is no effective coating process to control the deviation values ​​of brightness and color difference. At the same time, facing environmental protection issues, safety issues are becoming increasingly prominent.

[0003] Chinese utility model patent CN204374457U discloses a reflective cloth, comprising a base cloth layer and a reflective layer, wherein the base cloth layer and the reflective layer are bonded by an adhesive layer, a plurality of reflective glass beads are inlaid on the reflective layer, an aluminum film is provided on the inlaid surface of the reflective glass beads and the reflective layer, and the surface of the reflective layer is coated with a nano-silver antibacterial coating, a two-component anti-mildew coating, a single-component polyurethane waterproof coating, and a wear-resistant coating from bottom to top, but the deviation of the brightness and color difference of the product is not studied. Summary of the invention

[0004] The first aspect of the present invention provides a bright silver beaded film for reflective cloth, which is fixedly connected in sequence from bottom to top with a first transparent protective layer, a second transparent protective layer, a glass bead layer, a water-based focusing layer and a metal plating layer.

[0005] The second transparent protective layer, the aqueous focusing layer and the metal coating layer are all spherical coatings having the same spherical center as the glass microbead layer.

[0006] The aqueous focusing layer is prepared from aqueous focusing glue. The raw materials for preparing the aqueous focusing glue, by weight percentage, include 20-50% aqueous polyurethane dispersion, 3-10% curing agent, 0.3-1% coupling agent, 0.2-1% wetting agent, and deionized water to make up the balance.

[0007] The aqueous polyurethane dispersion includes anionic aliphatic aqueous polyurethane dispersion.

[0008] Optionally, the anionic aliphatic aqueous polyurethane dispersion has a viscosity of 50-3000 mPa·s at 25° C.

[0009] Optionally, the anionic aliphatic aqueous polyurethane dispersion has a viscosity of 50-1000 mPa·s at 25° C. and is purchased from Guangzhou Guanzhi New Material Technology Co., Ltd., model PU-6011.

[0010] The wetting agent includes a silicone wetting agent.

[0011] Optionally, the organosilicon wetting agent includes polyether-modified organosiloxane.

[0012] Optionally, the surface tension of the polyether-modified organosiloxane in a 1 wt % aqueous solution is lower than 20 dyn / cm.

[0013] Optionally, the surface tension of the polyether-modified organic siloxane in a 1 wt % aqueous solution is 19.6 dyn / cm, and the brand is Silok 8000.

[0014] The coupling agent includes at least one of A-151 (vinyl triethoxysilane, corresponding to KH-151), A-171 (vinyl trimethoxysilane, corresponding to KH-171), A-172 (vinyl tri(β-methoxyethoxy) silane), and KH-1706 (vinyl triisopropoxysilane).

[0015] The curing agent includes blocked isocyanate.

[0016] Optionally, the blocked isocyanate is provided by Covestro, with the brand name Imprafix 2794XP.

[0017] The preparation method of the water-based focusing glue comprises the following steps: mixing the water-based polyurethane dispersion and deionized water evenly, and sequentially adding a curing agent, a coupling agent and a wetting agent and stirring them evenly.

[0018] The metal coating comprises one of a metal aluminum coating, a metal silver coating and a metal titanium coating.

[0019] The material of the first transparent protective layer is PET, and the material of the second transparent protective layer is PE.

[0020] The present application has found that the aqueous focusing layer is prepared from an aqueous focusing glue, and the aqueous focusing glue is an aqueous polyurethane system, which can greatly improve the problem of bright silver color difference. Aqueous polyurethane uses water as a dispersion medium. Compared with traditional solvent-based systems, it can disperse glass beads more evenly and avoid agglomeration or sedimentation. This uniform dispersion characteristic can reduce the distribution difference of reflective powder in the coating, thereby reducing the color difference of the bright silver area. In addition, the ability of glass beads to penetrate into the surface of the fabric is also enhanced due to the low viscosity of the aqueous system. In particular, the aqueous polyurethane dispersion includes anionic aliphatic aqueous polyurethane dispersions, which are compounded with specific curing agents, coupling agents, and wetting agents to make the thickness of the aqueous focusing layer controllable and improve the process stability. It may be that the film-forming performance is improved, the coating surface is smooth, and the local reflection intensity difference caused by uneven film thickness is avoided. At the same time, the compatibility of aqueous polyurethane and glass beads is improved, which can reduce the interface separation phenomenon and prevent color difference caused by material stratification.

[0021] The second aspect of the present invention provides a method for preparing a bright silver beaded film for reflective cloth, comprising the following steps:

[0022] S1, compounding the first transparent protective layer and the second transparent protective layer to obtain a composite film layer;

[0023] S2, heating and softening the composite film layer, evenly distributing glass micro beads on the second transparent protective layer, allowing the glass micro beads to settle due to heat, and forming a glass micro bead layer on the second transparent protective layer;

[0024] S3, coating a water-based focusing glue on the glass bead layer, and forming a water-based focusing layer after curing;

[0025] S4, electroplating is performed on the aqueous focusing layer to obtain a metal coating.

[0026] The bright silver bead-embedded film is applied to the preparation of reflective cloth.

[0027] Beneficial Effects

[0028] 1. The aqueous focusing layer uses water as a solvent, which is non-toxic and environmentally friendly.

[0029] 2. No organic solvents are used in the production process of the bright silver implant film, which greatly improves the workshop operating environment, is odorless, friendly to staff, improves production efficiency, and has no flammable or explosive risks.

[0030] 3. The typical value of the reflective intensity of the bright silver implant film prepared in this application can be as high as 500CPL, which can enhance the warning effect.

[0031] 4. Water-based focusing glue can greatly improve the bright silver color difference problem, and at the same time make the thickness of the water-based focusing layer controllable.

[0032] 5. Water-based focusing glue can effectively improve the washability of reflective cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a cross-sectional structural diagram of the bright silver implanted bead film of Example 1.

[0034] Figure 2 This is a cross-sectional structure diagram of the reflective fabric.

[0035] Among them, 1. first transparent protective layer; 2. second transparent protective layer; 3. glass bead layer; 4. water-based focusing layer; 5. metal plating layer; 6. composite adhesive layer; 7. base fabric. DETAILED DESCRIPTION

[0036] Example

[0037] A bright silver beaded film for reflective fabric, such as Figure 1 As shown, a first transparent protective layer 1, a second transparent protective layer 2, a glass bead layer 3, an aqueous focusing layer 4 and a metal coating 5 are fixedly connected in sequence from bottom to top; the second transparent protective layer 2, the aqueous focusing layer 4 and the metal coating 5 are all spherical coatings with the same spherical center as the glass bead layer 3.

[0038] The aqueous focusing layer 4 is prepared from an aqueous focusing glue, and the raw materials for preparing the aqueous focusing glue are calculated by weight percentage as follows: 35% aqueous polyurethane dispersion, 6% curing agent, 0.5% coupling agent, 0.5% wetting agent, and deionized water to make up the balance. The viscosity of the aqueous polyurethane dispersion at 25°C is 50-1000mPa·s, purchased from Guangzhou Guanzhi New Material Technology Co., Ltd., model PU-6011; the surface tension of the wetting agent in a 1wt% aqueous solution is 19.6dyn / cm, brand: Silok8000; the coupling agent is KH-1706; the curing agent is provided by Covestro, brand: Imprafix 2794XP. The preparation method of the aqueous focusing glue is the following steps: mix the aqueous polyurethane dispersion and deionized water evenly, add the curing agent, coupling agent, and wetting agent in turn and stir evenly.

[0039] The metal coating 5 is a metal aluminum coating; the first transparent protective layer 1 is made of PET, and the second transparent protective layer 2 is made of PE.

[0040] A method for preparing a bright silver beaded film for reflective cloth comprises the following steps:

[0041] S1, compounding the first transparent protective layer 1 and the second transparent protective layer 2 to obtain a composite film layer;

[0042] S2, heating the composite film layer to 165° C. to soften it, evenly distributing glass micro beads on the second transparent protective layer 2, and allowing the glass micro beads to settle due to the heat, thereby forming a glass micro bead layer 3 on the second transparent protective layer 2;

[0043] S3, double-roll coating the water-based focusing glue on the glass bead layer 3, and forming a water-based focusing layer 4 after curing;

[0044] S4, electroplating is performed on the aqueous focusing layer 4 to obtain a metal coating 5.

[0045] Performance testing methods and data

[0046] The bright silver bead-embedded film prepared in the embodiment is applied to the preparation of reflective cloth, such as Figure 2 As shown, a composite adhesive layer 6 is coated on the bright silver bead-embedded film, and then covered with a base cloth 7 and rolled up.

[0047] Three batches of reflective fabrics (400 meters, 1000 meters, and 300 meters respectively) were selected for full-angle testing (instrument: RoadVista 932), and the test data are listed in Tables 1-3.

[0048] Table 1

[0049]

[0050]

[0051] Table 2

[0052]

[0053]

[0054] Table 3

[0055]

[0056]

[0057] It can be seen from the data in Tables 1-3 that the bright silver implanted bead film prepared in the present application is used for the production of reflective cloth, and its full-angle reflection meets the production requirements, and it has excellent reflective stability to meet the requirements of continuous production.

Claims

1. A bright silver implant film for reflective cloth, characterized in that: A first transparent protective layer (1), a second transparent protective layer (2), a glass bead layer (3), a water-based focusing layer (4), and a metal coating layer (5) are fixedly connected in sequence from bottom to top.

2. The bright silver implant film for reflective fabric according to claim 1, characterized in that: The second transparent protective layer (2), the aqueous focusing layer (4) and the metal coating layer (5) are all spherical coatings having the same spherical center as the glass microbead layer (3).

3. The bright silver implant film for reflective fabric according to claim 2, characterized in that: The aqueous focusing layer (4) is prepared from an aqueous focusing glue. The raw materials for preparing the aqueous focusing glue, by weight percentage, include 20-50% aqueous polyurethane dispersion, 3-10% curing agent, 0.3-1% coupling agent, 0.2-1% wetting agent, and deionized water to make up the balance.

4. The bright silver implanted film for reflective fabric according to claim 3, characterized in that: The aqueous polyurethane dispersion includes anionic aliphatic aqueous polyurethane dispersion.

5. The bright silver implant film for reflective fabric according to claim 4, characterized in that: The viscosity of the anionic aliphatic aqueous polyurethane dispersion at 25° C. is 50-3000 mPa·s.

6. The bright silver implanted film for reflective fabric according to claim 5, characterized in that: The wetting agent includes a silicone wetting agent.

7. The bright silver implanted film for reflective fabric according to claim 6, characterized in that: The coupling agent includes at least one of the following brands: A-151, A-171, A-172, KH-1706.

8. The bright silver implanted film for reflective fabric according to claim 7, characterized in that: The curing agent includes blocked isocyanate.

9. The bright silver implant film for reflective fabric according to claim 3 or 8, characterized in that: The preparation method of the water-based focusing glue comprises the following steps: mixing the water-based polyurethane dispersion and deionized water evenly, and sequentially adding a curing agent, a coupling agent and a wetting agent and stirring them evenly.

10. A method for preparing the bright silver implanted film for reflective fabric according to claim 3, characterized in that: The following steps are involved: S1, compounding the first transparent protective layer (1) and the second transparent protective layer (2) to obtain a composite film layer; S2, heating and softening the composite film layer, evenly distributing glass micro beads on the second transparent protective layer (2), allowing the glass micro beads to settle due to the heat, and forming a glass micro bead layer (3) on the second transparent protective layer (2); S3, coating a water-based focusing glue on the glass bead layer (3), and forming a water-based focusing layer (4) after curing; S4, performing metal electroplating on the aqueous focusing layer (4) to obtain a metal coating (5).

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