CN112946798A

CN112946798A - Reflective fabric and preparation method thereof

Info

Publication number: CN112946798A
Application number: CN202110133366.6A
Authority: CN
Inventors: 查伟强; 贾伟灿; 施威; 张国强; 王世杰
Original assignee: Hangzhou Chinastars Reflective Materials Co ltd
Current assignee: Hangzhou Chinastars Reflective Materials Co ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-06-11

Abstract

The invention relates to the technical field of reflective materials, and provides a reflective fabric and a preparation method thereof, aiming at solving the problems existing in the preparation process of the existing reflective material. The product has no floating beads and does not have the phenomenon of low-temperature bending whitening by adopting the mixing process of the glue and the beads; meanwhile, after the coating is calendered, the aluminum coating has better reflection effect.

Description

Reflective fabric and preparation method thereof

Technical Field

The invention relates to the technical field of reflective materials, in particular to a reflective fabric capable of emitting colored light and a preparation method thereof.

Background

At present, the existing preparation method of the reflecting material is to plant beads on a PET film, scatter glass beads on a composite adhesive surface, then carry out vacuum aluminizing on the bead surface, then compound a layer of composite adhesive on a base fabric, then carry out hot pressing compounding with the bead-planted film, and transfer the glass beads to the composite adhesive. The preparation method has the following problems that firstly, dust is easily generated in the production process, so that the front and back surfaces of the prepared product are provided with glass beads in different degrees, the waste of the glass beads is caused, the surface state of a reflecting material is not good, and sensitive people can have an allergy phenomenon; secondly, the aluminum coating or silver coating exists below the glass beads, which is easily corroded by sweat stain and the like, and influences the appearance (the reflection degree is influenced), and thirdly, the phenomenon that the composite adhesive falls off or the glass beads fall off is easily caused when the reflective cloth is rubbed, especially in winter.

Disclosure of Invention

In order to solve the problems in the existing preparation process of the reflective material, the invention provides the reflective fabric and the preparation method thereof, and the product has no floating beads and does not have the low-temperature tortuous whitening phenomenon by adopting the blending process of glue and beads.

The invention is realized by the following technical scheme: a reflecting fabric is formed by sequentially connecting base cloth, a PU coating, a plating layer and bead mixing glue.

The base fabric includes chemical fiber fabric, pongee fabric and nylon fabric, but is not limited to the fabrics.

The PU coating is a polyurethane coating, and the fabric after being coated is full in hand feeling, elastic and filmy on the surface. The PU coating is soft and elastic; the coating has good strength and can be used for a very thin coating; the coating is porous and has moisture and air permeability; wear resistance, moisture resistance and dry cleaning resistance.

The plating layer is vacuum aluminized or silvered.

The invention adopts the blending process of the glue and the beads, thereby not only improving the working environment without raising dust, but also leading the product to have no floating beads and simultaneously avoiding the low-temperature bending whitening phenomenon. The bead mixing glue is composed of the following components in parts by weight:

wherein the curing agent is selected from one of isocyanate curing agent, aziridine curing agent, amino curing agent and epoxy curing agent. Preferably, the isocyanate curing agent is selected from one of Kostew L-75, 3300, 3390 and N-75, and has good chemical resistance, weather resistance, excellent gloss retention and mechanical properties as the curing agent of the light-resistant polyurethane coating.

The bead mixing glue comprises pigment, and can emit colored light, not just white light, under the irradiation of a light source, and the refractive index of the glass beads is 1.5-2.2.

The solvent is one or two of water, ethanol, methanol, ethyl acetate, butanone and toluene. The solvent has good miscibility with the curing agent, and the prepared solution has stability.

The auxiliary agent comprises a coupling agent and a wetting agent, and the coupling agent is preferably KH 560.

The preparation method of the reflective fabric comprises the steps of firstly coating a PU coating on a base fabric, then rolling and flattening the base fabric on a calender, then carrying out vacuum plating on the surface of the calendered coating, then coating the mixed bead glue on the surface of the plated layer, and drying and rolling the coated layer through a drying tunnel to obtain the reflective fabric.

Preferably, the drying tunnel temperature is based on the boiling point of the solvent, and the drying tunnel temperature exceeds the boiling point.

The calendering condition after coating the PU coating is 100-250 ℃, the pressure is 2-10kgf/cm, the PU coating is almost in the cloth seam, the thickness is very thin, the aim is to ensure that the coating is smooth, and a mirror surface effect is formed during aluminum plating, so that the reflection effect of the aluminum plating layer is better.

Preferably, the thickness of the plating layer is 1-500nm, and the thickness of the bead mixing glue is 10-150 um.

Preferably, the coating is carried out using a curved doctor blade which is matched to the composite roll.

The invention adopts a coating method containing glass beads to firmly fix the glass beads on the coating, so that the glass beads are not loosened, and the coating is effectively isolated and protected with the PU soft coating to achieve the sandwich effect.

Compared with the prior art, the invention has the beneficial effects that:

(1) the prepared reflective fabric has no phenomenon of floating beads falling off, so that the human body is prevented from being injured;

(2) the working environment is improved, and the health of workers is facilitated;

(3) effectively protecting the plating layer and preventing the appearance from being influenced by corrosion;

(4) avoiding the phenomenon of zigzag whitening in cold weather.

Drawings

FIG. 1 is a schematic structural view of a reflective fabric of the present invention;

wherein, 1: base fabric, 2: PU coating, 3: aluminum or silver plating layer, 4: bead mixing glue, 41: glass beads.

Detailed Description

The present invention will be described in further detail below with reference to examples and the accompanying drawings, in which the starting materials are commercially available or can be prepared by conventional methods.

Example 1

As shown in figure 1, the reflective fabric is formed by sequentially connecting base cloth 1, a PU coating 2, a silver or silver plated layer 3 and bead mixed glue 4, wherein glass beads 41 are arranged in the bead mixed glue 4.

Wherein the thickness of the silver plating or silver plating layer is 1-500nm, the thickness of the bead mixing glue is 10-150um, and the refractive index of the glass beads is 1.5-2.2.

Preparation example 1

(1) The preparation method of the bead mixing glue comprises the following steps: mixing 10 parts of acrylic resin, 0.5 part of Kesimong L-75 curing agent and 60 parts of 50-micron glass microspheres, wherein the refractive index of the glass microspheres is 1.8, the solvent is 5 parts of ethanol, and 0.1 part of KH560 coupling agent in parts by weight to obtain mixed bead glue;

(2) selecting 190T chemical fiber cloth 1, coating a PU coating 2, drying, calendering on a calender at 200 ℃ and under the pressure of 5kg f/cm, wherein the thickness of the PU coating 2 can be ignored, then carrying out vacuum aluminum plating on a calendering surface, coating an aluminum plating layer 3 with the thickness of 100nm, coating mixed bead glue 4 with an arc-shaped scraper, coating the mixed bead glue 4 with the thickness of 100um, drying, and rolling to obtain the reflective fabric shown in figure 1.

Preparation example 2

(1) The preparation method of the bead mixing glue comprises the following steps: according to parts by weight, 25 parts of polyurethane resin, 2 parts of Kesimong N-75 curing agent, 20 parts of 30-micron glass beads, 1.8 parts of glass bead refractive index, 10 parts of solvent water, 1 part of aluminum paste and 0.5 part of wetting agent (GSK585) are mixed to obtain bead mixing glue;

(2) selecting 210T Chunyan fabric 1, coating a PU coating 2, drying, calendering at 150 ℃ and under the pressure of 8kg f/cm on a calender, wherein the thickness of the PU coating 2 can be ignored, then carrying out vacuum aluminum plating on the calendered surface, the thickness of an aluminum plated layer is 50nm, coating mixed bead glue 4 by adopting an arc-shaped scraper, the thickness of the mixed bead glue 4 is 80 mu m, drying, and rolling to obtain the reflective fabric shown in figure 1.

Preparation example 3

(1) The preparation method of the bead mixing glue comprises the following steps: according to parts by weight, 20 parts of polyurethane resin, 1 part of Corsika 3300 curing agent, 40 parts of 40um glass microspheres, 1.6 parts of glass microspheres with refractive index, 5 parts of ethyl acetate solvent, 1 part of aluminum paste, 0.5 part of wetting agent (GSK585) and 0.1 part of KH560 coupling agent are mixed to obtain bead mixing glue 4;

(2) selecting 210T nylon yarn woven fabric 1, coating PU coating 2, drying, calendering at 250 ℃ and under the pressure of 10kg f/cm on a calender, wherein the thickness of the PU coating 2 can be ignored, then carrying out vacuum aluminum plating on the calendered surface, the thickness of the aluminum plated layer 3 is 150nm, then coating mixed bead glue 4 by adopting an arc-shaped scraper, the thickness of the mixed bead glue 4 is 150um, drying and rolling to obtain the reflective fabric shown in figure 1.

Comparative example 1: reflecting material prepared by conventional pearl-containing process

Firstly, spreading glass beads on the conventional coating adhesive, then directly coating the bead-containing coating adhesive on the base cloth, drying through a drying tunnel, and rolling.

Comparative example 2: preparation method of existing reflective fabric

(1) Firstly, coating bead glue on a PET film, drying the PET film through a drying tunnel, then planting glass beads, rolling the PET film, and then carrying out vacuum aluminizing for later use.

(2) Coating composite glue on a pet anti-sticking film, drying the film through a drying channel, compounding the film with base cloth, then entering a second compounding station, stripping the anti-sticking film, compounding the film with an aluminized bead planting film, and transferring glass beads onto the composite glue.

Test example

The light reflecting materials prepared in examples 1 to 3 were compared with those prepared in comparative examples, and the comparison results are shown in table 1.

Table 1:

	floating ball	Working environment
			Example 1	Is free of	Without dust
Example 2	Is free of	Without dust
			Example 3	Is free of	Without dust
Comparative example 1	Is provided with	With dust emission
			Comparative example 2	Is provided with	With dust emission

As can be seen from the table 1, the preparation method of the application greatly improves the working environment, improves the condition of the floating beads on the surface of the product, and avoids blocking pores of human bodies or animals when contacting with the human bodies or the animals.

The low-temperature bending whitening phenomenon and the falling phenomenon of the glass beads do not occur when the glass beads are used in winter.

Claims

1. The reflective fabric is characterized by being formed by sequentially connecting base cloth, a PU coating, a plating layer and bead-mixed glue.

2. The light-reflecting fabric according to claim 1, wherein the bead mixing glue comprises the following components in parts by weight:

acrylic resin or urethane resin: 0-30,

curing agent: 0.1-3,

glass beads: 10-60,

solvent: 0.1-10,

pigment: 0-10,

auxiliary agent: 0.1-5.

3. The reflective fabric of claim 2, wherein the curing agent is selected from one of isocyanate curing agents, aziridine curing agents, amino curing agents, and epoxy curing agents.

4. The retroreflective sheeting of claim 2 wherein the glass microspheres have a refractive index of 1.5 to 2.2.

5. The reflective fabric of claim 2, wherein the solvent is one or two selected from water, ethanol, methanol, ethyl acetate, methyl ethyl ketone, and toluene.

6. The retroreflective fabric of claim 2, wherein the auxiliary agent includes a coupling agent and a wetting agent.

7. A method for preparing the reflective fabric according to any one of claims 1 to 6, wherein the reflective fabric is obtained by coating a PU coating on a base fabric, then rolling and flattening the PU coating on a calender, then vacuum plating the calendered coating, then coating the bead mixture on the plated layer, drying the coated layer through a drying tunnel and rolling.

8. The preparation method of the reflective fabric according to claim 7, wherein the thickness of the coating is 1-500nm, and the thickness of the bead-mixed glue is 10-150 um.

9. The method for preparing the reflective fabric according to claim 7, wherein the coating is performed by using an arc-shaped scraper.