KR930006936B1 - Preparation of discoloric fiber - Google Patents

Abstract

forming a thermochromic layer with a printing paste, containing microencapsulated thermochromic pigments, on a side of a dyed fabric in a way that the color of thermochromic pigments is different from that of the dyed fabric and the thermochromic layer is coated on the over-all surface of the fabric, or the layer is printed partly on the surface of the fabric; over-coating the surface of the thermochromic layer with a resin solution; and forming a ultra-violet sensitive color-changeable layer by printing the other-side of the dyed fabric with a printing paste, containing ultra-violet sensitive color-changeable pigments.

Description

Manufacturing method of discolorable paper

Figure 1 is a cross-sectional view of the color change paper produced by the present invention.

2 is a cross-sectional view of a conventional thermochromic paper.

The present invention relates to a method for producing a color changeable paper that changes the color in accordance with the change of temperature, as well as the color changes even with sunlight.

Conventional thermochromic forge is a color change only when the temperature changes over a certain range, there was a problem that the discoloration function is not exhibited in the natural environment surrounding the temperature change is not so large.

The present inventors apply a pigment that is discolored by ultraviolet rays of 300-400 nm (nano-meta) wavelength in the sunlight even if there is no change in temperature to the thermochromic paper. Invented a forge that can be discolored separately by change and exposure to sunlight.

Hereinafter, the present invention will be described.

First, thermochromic paper as shown in FIG. 2 is prepared.

The thermochromic pigment used herein is composed of two components, an electron-donating material capable of emitting electrons at an arbitrary temperature or less, and an electron-accepting material capable of absorbing electrons. As dyes capable of discoloration from color to color obtained by reducing colored dyes, there are many kinds such as triphenylmethane, floran, and roidaminlactam. Representative dyes include crystal violet lactone (blue), 3-diethylamino-6-methyl-7-anilofloran (black), and the like. The color-receiving agent, which is an electron-accepting substance, generates a color reaction by receiving electrons from a leuco dye, and includes phenolic compounds such as bisphenols, alkylphenols, and noblock phenolic resins, aromatic carboxylic acid derivatives, metal salts, hydroxybenzoic acid esters, There are many kinds of activated clay.

These materials are prepared in a state of being put into a microcapsule to prepare a thermochromic material as described above contained in a spherical solid body.

The thermochromic microcapsules can be broken by friction, and when broken, the thermochromic material inside is scattered out and loses its discoloring function. Thus, the thermochromic layer is formed on the fiber cloth by coating or printing. Like the protective resin layer to protect the thermochromic layer. A potato ultraviolet discoloration pigment, which may be discolored by ultraviolet rays, is bonded to the surface of the thermochromic paper thus prepared with resin.

The forge used in the present invention is a forge made of natural fiber or synthetic fiber having a thickness such that the color of the thermochromic microcapsule pigment discolored by temperature change does not interfere with the appearance of the forge.

Hereinafter, the present invention will be described in more detail.

First, 20-30 wt% of the microencapsulated thermochromic pigment as described above on one side of the forge is mixed with 20-30 wt% of an acrylic binder having a solid content of about 50 wt%, and the surfactant is 5-10 wt% with 70-80 wt% of carcass. Add% to 20% by weight of water, add 10 to 20% by weight of UV absorber, add 50 to 70% by weight of the thickener prepared by mixing thoroughly, and mix well so that the viscosity is about 80 to 160 poise.

At this time, the UV absorber should be contained 0.1 ~ 30wt% in the whole thickener. If less than 0.1wt%, light resistance is weakened, so that deterioration of thermochromic pigment occurs, and if it is more than 30wt%, compatibility with other components in thickening solution is lowered and coating performance is deteriorated.

The prepared printing foil is coated with a screen coating machine or a knife coating machine, or a desired pattern is printed with screen printing or roller printing, and dried for 1 to 2 minutes at a temperature of 100 to 120 ° C, and then to 1 to 1 with hot air at about 140 to 160 ° C. Cure for 2 minutes.

Polyurethane resin that can protect the thermochromic pigment layer microencapsulated surface of the thermochromic layer with a knife coater, a grab coater, toluene, M.K., D.M.F (DMF) Overcoating with a resin solution dissolved in a solution containing a solvent such as a solvent and a cross linking agent such as a diisocyanate, and drying and curing at 150 to 170 ° C. for 1 to 2 minutes.

The forge thus produced has a structure as shown in FIG.

Overturn this forge, and underneath it, 5 to 25 wt% of a detected ultraviolet discoloration pigment made of spiro naphthooxadines or pulgid compounds, 30 to 50 wt% of an acrylic binder, and 50 to 60 wt% of an acrylic key Mix the mixture so that the viscosity becomes 80 ~ 160 poise and apply it all over with knife coating machine, screen coating machine, etc., or seal the desired pattern with screen printing machine or roller printing machine and dry it at 100 ~ 120 ℃ for 1 ~ 2 minutes and then at 140 ~ 170 ℃. It hardens for 1-2 minutes.

By the manufacturing method as described above, a paper having a cross-sectional structure as shown in FIG. 1 and discolored by temperature and sunlight in the surrounding natural environment is produced.

The present invention will be described with reference to the following Examples.

Example 1

Weaving is made of 150 denier polyester filament yarn to make a bag of Gabardine tissue to a weight of 120g / ㎡ and washed with water and dried through the usual refining and dyeing process.

The color shall be beige.

Here, 20 wt% of acrylic resin 30 wt% microencapsulated microcapsule 10 ℃ thermoreversible discoloration pigment (red) and 50wt% of acrylic thickener in Table 1 are mixed to make the viscosity 100 poise. Dry and cure for 2 minutes.

74 wt% of polyester-based one-component polyurethane resin, 3 wt% of diisocyanate, and 23 wt% of a mixed solvent of D.M.F. and M.K.K. Coated, dried at 150 ° C. for 2 minutes, and cured.

The resin solution was mixed with 10 wt% spironaphtho oxadidine photochromic pigment, 40 wt% acrylic resin, and 50 wt% acrylic thickener of Table 2 on the back side of the prepared forge. After 1 minute of drying at 150 ℃ curing treatment for 1 minute.

TABLE 1

Kerosene 70wt%

5 wt% of surfactant (polyoxyethylene fatty acid ethylene)

15 wt% of ultraviolet absorbers ("Irganox 1010" manufactured by Ciba-geigy)

10wt% water

TABLE 2

Kerosene 75wt%

17wt% water

Surfactant (polyoxyethylene fatty acid ester) 8wt%

Example 2

After dyeing the polyester forge in Example 1 in red, a thermochromic printing resin was mixed with acrylic resin 25wt%, microencapsulated 5 ℃ thermoreversible discoloration pigment (yellow) 20wt%, 55wt% acrylic thickening arc of Table 1 As in Example 1, the entire surface was coated with a knife coater, dried at 150 ° C for 2 minutes, and cured.

72 wt% of one-component polyurethane resin, 3 wt% of diisocyanate, and 25 wt% of a mixed solvent of D.M.F. and M.K. are applied over the surface with a knife coater and dried and cured at 150 ° C for 2 minutes. . The resin solution composed of 12 wt% of polgiated photochromic pigment, acrylic resin 40 wt%, and acrylic thickener of 48 wt% on the back of the prepared forge was inlaid with a floral pattern on a screen printing machine and dried at 100 ° C. for 2 minutes. Then cure at 150 ° C. for 1 minute.

Example 3

Weaving a plain weave fabric with a weight of about 120 g / m2 with 150 denier polyester filament yarn, dying it to white through a normal refining process, washing with water, drying, and thermochromic in the resin solution containing the thermochromic pigment as in Example 1 The pigment was mixed with the same content using only the pigment as a color change pigment of 5 ℃ green, and then printed with a flower pattern in a screen printing machine, dried at 100 ℃ for 2 minutes, and cured at 150 ℃ for 1 minute.

And the whole surface is apply | coated with the protective layer resin liquid of the same composition as Example 2, it is made to dry and harden like Example 2. Next, the same potato ultraviolet discoloration resin solution as in Example 1 was printed with a butterfly pattern on the screen printing machine, and dried and cured in the same manner.

The test results of the color changeable cloth prepared in Examples 1 to 3 are shown in Table 3.

TABLE 3

Claims (4)

On one side of the dyed forge was formed a thermochromic layer with a microencapsulated thermochromic pigment, then overcoated the surface of the thermochromic layer with a resin solution, and on the other side of the forge A method for producing a discolorable cloth for forming a potato ultraviolet discoloration layer with a printing arc containing potato ultraviolet discoloring pigment. The method of claim 1, wherein the thermochromic layer is coated on the entire surface of the forge or inlaid on a portion thereof. The method of manufacturing a discolorable cloth according to claim 1, wherein the potato ultraviolet discoloration layer is inlaid by a printing method. The method of claim 1, wherein the color of the dyed forge and the color of the thermochromic pigment is different from each other.

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