KR20090022411A - A method of preparing a photochromic textile by textile printing using a photochromic ink resin - Google Patents

Abstract

A method for manufacturing photochromic textile according to a textile printing method by using a photochromic ink resin is provided to express an effect of color maximumly by applying a mineral stain pigment to clothes. A method for manufacturing photochromic textile comprises the following steps of: manufacturing a photochromic ink resin component by mixing an organic solvent consisting of a drying agent, a diluent, dimethylformamidem, an ink resin, a photochromic pigment selected from a group consisting of a red, blue, yellow pigment; sealing with a printing board; and drying in 120~150°C.

Description

A method of preparing a photochromic textile by textile printing using a photochromic ink resin}

The present invention relates to a method for producing a fiber containing a photochromic pigment, and more particularly, to manufacture an ink resin composition containing a photochromic pigment by printing by a printing method, the photochromic color is excellent and the touch is hardly left behind It is about a fiber.

Photochromic refers to a property that changes color due to the action of light (ultraviolet rays) and returns to its original color in a room (where ultraviolet rays are blocked). A photochromic compound is a reversible change in chemical structure caused by ultraviolet rays. , Refers to a compound whose color changes from colorless to colored or from colored to other colored. When the ultraviolet light is irradiated to the solution or solid photodenatured compound, the color changes due to the change in absorption wavelength due to the change in chemical structure, but when the UV light is blocked, the photochromic phenomenon returns to the original color again.

UV discoloring pigments are pigments in which the color of the dye and the state of no color are reversibly changed while the resonance structure of the dye is changed by an external stimulus. Pigment discolored by UV light has been developed for more than 10 years, and recently, development has been actively conducted in Korea, reducing the price burden. If applied to clothing, such a color pigment can be developed into a multi-colored garment having a color that changes according to the environment beyond the existing concept of clothing having a single color, and can open a new beginning. It is applied to bedding, etc., and furthermore, it can be deployed as medical smart clothing that can check health and psychological state.

Currently, the application of UV discoloring pigments is mainly applied to plastics and papers, and the application of clothing is limited to the method of adding yarns to yarns. However, when added to the yarn, only a single color or a stripe pattern is possible, and thus it is difficult to develop a variety of patterns. Therefore, it is necessary to establish a condition applied to a printing method in order to apply various designs. Existing photochromic fiber has a problem that the touch feeling (touch) of the fabric is damaged or a lot of residual color remains by printing printing. In this case, since there is no dramatic effect of displaying vivid colors due to environmental changes in the absence of any environment, there is an urgent need for a method of manufacturing a good discolored fiber that can be applied to various designs but has excellent touch and little residual color. It is being requested.

It is an object of the present invention to provide a method for producing a photochromic fiber by a printing method, which is excellent in touch and leaves little residual color, and a photochromic fiber produced accordingly.

In order to achieve the above object, the present invention mixes 15 to 25% of photochromic pigments selected from the group consisting of red, blue and yellow pigments, ink resins 65 to 80%, organic solvents 5 to 10%, diluents and drying retardants. It provides a photochromic fiber manufacturing method comprising the step of preparing a photochromic ink composition, the step of stamping using a printing plate, and drying at 130 ~ 150 ℃.

Hereinafter, the present invention will be described in detail.

The term "pigment" used in the present invention means a powder colorant which is insoluble in water and most organic solvents. It is mixed with colorants such as linseed oil, varnish, synthetic resin solution, and arabic rubber to make paints, printing inks, paints, etc., and color them on the surface of the object, or directly by mixing them with rubber or synthetic resin. There are dyes similar to pigments, which are generally colored powders soluble in water and organic solvents, and are mainly used for coloring fibers. The pigment is opaque compared with the dye and has a large hiding power. The pigment used in the present invention is a colored pigment.

The term "textile printing" as used in the present invention is a technique of dyeing a pattern on the surface of the fabric so that a necessary pattern may be displayed by partially coloring a thread or a fabric, particularly a fabric. Although they are classified into various types according to the object to be printed, the printing work, and the kind of colorant used, it is most appropriate to explain the principle of the technique by dividing into dye printing and pigment printing.

In particular, what is used in the present invention is pigment printing, which refers to one type of pigment dyeing method with printing made of pigment or pigment resin color. Pigment printing has a disadvantage in that durability is low and the texture of the fabric is lowered, but it can be printed on not only natural fibers but also synthetic fibers, and has excellent weatherability (耐候) compared to dye printing. It clearly shows delicate patterns, can be used with dyes, and has a simple dyeing process.

The term "fiber" in the present invention is meant to include all of the fiber raw material, fiber yarn and fiber fabric, the fiber material is a material of the fiber yarn, the fiber yarn (filament, thread, yarn, etc.) is a constituent material of the fiber fabric, Fibrous fabrics include products made from fibrous yarns, for example woven, knitted, felt, plated, braid, lace, nonwoven, laminated, molded fabrics, etc. do. In the present invention, the term "fiber" is used interchangeably with "fiber product". Textile products made from such fibers, such as garments (eg, underwear, sportswear, pajamas, casual, mountaineering, etc.); plant; Bedding; Shoe soles; carpet; towel; Curtains, scarves and the like are also included within the scope of the present invention.

The present invention relates to a method of manufacturing a photochromic fiber with little damage to the touch and leaving little residual color. The present invention relates to a photochromic pigment, an ink resin, an organic solvent, a diluent and a drying retardant selected from the group consisting of red, blue and yellow pigments. Preparing a photochromic ink composition by mixing; Stamping using a printing plate; And drying at 130-150 ° C.

First of all, in the present invention, the photochromic pigment and the ink resin are mixed to produce an ink composition having a certain discoloration effect when applied to the fabric, with little damage to the touch, and leaving little residual color. The ink composition is largely composed of photochromic pigments, ink resins, solvents, diluents and drying retardants.

When the photochromic pigment is applied in a manner of attaching a general pigment with a binder, the coating film becomes thick, the touch is damaged, and the sensitization due to the stimulus is not satisfactory to obtain a discoloring effect. In addition, as a large amount of pigment is printed, the original color becomes clear, but after the color disappears before and after discoloration, the original color is left, so that the effect of color to colorless or colorless to color cannot be completely obtained. It is necessary to select the concentration that can be used.

The color of the photochromic pigments currently produced is not much, and in the present invention, red, blue, and yellow of the four colors red, blue, yellow, and violet produced by the domestic company polychrome Only was used.

The ink of the present invention was used by purchasing the photochromic pigment in a slurry state (polychrome). In particular, the red and blue pigments, which have relatively strong color intensities, can express a darker color after discoloration if a large amount of the pigment is used. The preferred amount of the pigment is 15 to 25%, more preferably 18 to 24% by weight of the total ink composition. In one embodiment, preferably 20 to 25% for yellow, 15 to 20% for red and blue, more preferably 23 to 25% for yellow and 17 to 19% for red and blue.

Yellow pigment is weak in color intensity and does not leave much residual color before discoloration. Instead, it does not show a clear color after discoloration. Therefore, 24% is most suitable when considering the color after discoloration and discoloration. Red and blue are most preferably 18%.

In addition, in the present invention, as the ink resin, one resin selected from the group consisting of polyolefin resin, silicone resin, PVC resin, polyurethane resin, and alkyd resin is used at 65 to 80% of the prepared ink composition. In one embodiment, when using a red or blue pigment, the ink resin is 70 to 75% by weight, most preferably 73 to 74% by weight. When using a yellow pigment, the ink resin is 65 to 70%, most preferably 67 to 68% by weight.

The organic solvent in the ink composition of the present invention uses a mixture of dimethylformamide (DMF), a diluent and a drying delay agent to dissolve the pigment slurry well and to mix well with other solvents. The diluent and the drying retardant are selected from the group consisting of acetonitrile, benzene, chloroform, acetone, cyclohexanone, isopropyl alcohol, methylene chloride, butyl acetate, methyl salicylate, and mixtures thereof. . The total weight of the organic solvent is 5 to 10% of the total weight of the prepared ink composition. The compositional ratio of the organic solvent is DMF: diluent: dry delay agent is mixed in a ratio of 10: 5: 5 to 10: 7: 3, preferably 10: 5.5 4.5, 10: 6: 4, 10: 6.5 The mixture is used in a ratio selected from the group consisting of: 3.5 and 10: 7: 3, and more preferably in a ratio of 10: 6.5: 3.5.

Here, the diluent lowers the density of the ink, and at the same time, it is very volatile and dries the ink quickly. The faster the drying speed of ink, the less the amount of ink penetrating between the fibers, the better the feel of printing, but there is a possibility of blocking the eyes of the printing screen during printing, which may lower the workability.

In addition, 0.001 to 0.01 wt% of light stabilizer and 0.001 to 0.008 wt% of antioxidant can be added and used. Compounds which can be used as light stabilizers are benzotriazole type, HALS type, cyanurate type, urea type and the like, and compounds usable as antioxidants are diarylamine type, phenol type, phosphoric acid type and the like.

In the present invention, the step of stamping using a printing plate with the prepared ink resin composition and drying at 120 ~ 150 ℃.

Until now, photochromic pigments have been mainly applied to plastic moldings or printed on paper, but have not been actively applied to clothing. Some companies put fiber inside the fiber when spinning on polypropylene yarn, but it is difficult to apply it to various designs, so it was necessary to establish a method of applying by printing method.

In the printing method using the ink resin composition prepared above, it is most preferable to use a printing plate made of 150 to 250 neck screen.

A printing plate is a plate with a thin film, except for the part to be colored, with the screen fixed to a square frame. If you pour ink on this plate and use a squeegee to scrape over the pattern where the screen holes are not blocked, the ink will escape between the holes and appear on the fabric. The ink may be dried at room temperature, but it may be dried or dried at 120 to 150 ° C. for about 30 seconds because it may cause contamination or bleeding to other fabrics.

By the above method, when the ultraviolet discoloration pigment is printed on the fabric, the photochromic fiber can be obtained by maximizing the effect of photochromism by minimizing the change in the feel of the fabric before and after the printing and minimizing the residual color before the discoloration by ultraviolet rays. have.

The photochromic fiber obtained is less damaged by touch (excellent in touch) and leaves little residual color.

Printed fibers can be evaluated using the KES-FB test. KES-FB test is a test for measuring the shape of a fabric. Tensile, bending, shear, surface, and compressive properties are related to the fabric's appearance. It is calculated by considering six mechanical, physical measurements, and sensory estimates such as weight, thickness, and thickness.

In the present invention, even if the ratio of the two organic solutions used as a solvent in the case of 100% cotton in 5: 5 can obtain a good touch in the cotton, but the blend of cotton and PET is mainly used and functional rather than 100% cotton at present Fabric is mainly composed of PET-based products, so it is blended in a ratio that can provide excellent touch in cotton and PET.

In addition, in relation to the afterglow, the red pigment and the yellow pigment may be almost invisible through the concentration control, but the blue pigment is inevitable to leave the afterglow because the color is also blurred when the color is not visible. In the case of the blue pigment, even the pigment slurry itself, which is not mixed with other preparations, has a light yellowish green color. Therefore, it is impossible to completely remove the residual color.

Therefore, as a way to hide instead of removing the color, the present invention uses a colored fabric. At this time, the dark background is not suitable because it warms the expressed color and leaves a white trace before discoloration, and light pastel tones such as ivory, light pink, and light blue are suitable. Alternatively, you can print white fabrics with a bordered design and use plain colored ink on the edges and print the inside with photochromic ink to hide the residual color before discoloration and express the color change after discoloration.

The present invention relates to a printing method for expressing the effect expressed in colorless to colored by applying a photochromic pigment to clothing, and in the general printing method using a binder, it is difficult to expect a soft touch ink manufacturing method using a resin It provides the ability to minimize the residual color before discoloration and to use fibers that express vivid colors after discoloration. For this purpose, the content of the photochromic pigment is preferably limited to 18 to 24%, and the ratio of the three components used in the ink resin, the organic solvent, and the organic solvent is most suitable for the excellent touch in cotton and PET. It provides a method for producing a photochromic fiber to maximize the effect by.

Hereinafter, the configuration and effects of the present invention will be described in more detail with specific examples, but these examples are only intended to more clearly understand the present invention and are not intended to limit the scope of the present invention.

Comparative example  One

An ink composition was prepared using 7.5% red photochromic pigment, 85% polyurethane resin, and 7.5% organic solvent, and was printed in the same manner as in Example 1 below.

Comparative example  2

An ink composition was prepared using 27.5% red photochromic pigment, 65% polyurethane resin, and 7.5% organic solvent, and was printed in the same manner as in Example 1 below.

Example  1: printing Printing Afterglow  Decrease rating

18% red photochromic pigment, 74% polyurethane resin, 8% organic solvent (DMF, cyclohexanone, methyl salicylate), light stabilizer (benzotriazole) and antioxidant (amine) Prepared. At this time, the ratio of DMF: diluent: dry delay agent in the organic solvent was 10: 6.5: 3.5.

Silk-screen printing using the printing plate as the ink resin composition and dried for 30 seconds at 120 ~ 150 ℃.

When silk screen printing as described above, the color before and after the photochromic was confirmed through Computer Color Matching (CCM).

Table 1 below shows the results of K / S values before and after discoloration at the maximum absorption wavelength (530 nm) for the printing material using the ink prepared according to Comparative Examples and Examples for the red color. K / S is a reflectance value, white is high and black is low.

Table 1

Comparative Example 1 Comparative Example 2 Example Discoloration K / S 78.2 67.0 76.4 K / S after discoloration 62.7 53.6 55.7

Photochromic pigments change from colorless to colored after receiving UV, so they become colored.

The comparative example shows the K / S value according to the pigment concentration, the higher the K / S value, the better the effect, but is exactly similar to the color of the attached white (before the K / S of the white 84), after discoloration A low K / S value (meaning a dark color, close to 0 for black) is an excellent effect.

Therefore, in Comparative Example 1, the color after the discoloration is small, but the color after the discoloration is not clear, but the color after the discoloration is relatively clear, but the color difference between the white cloth (K / S average of the white cloth 84) is large, leaving a lot of residual color. Could know.

As a result, Comparative Example 1, which has a low dye concentration, is not clear after discoloration, and Comparative Example 2, which has a high concentration, remains dark before discoloration, so it can be confirmed that it is not appropriate.

On the contrary, Example 1 shows a vivid color similar to the color after discoloration of Comparative Example 2, and the color before discoloration is close to that of Comparative Example 1, that is, it has a high K / S value before discoloration and is similar to the color of the white cloth. Since no color remains after the discoloration, the use concentration of the photochromic pigment 18% and the ink resin 74% used in Example 1 is the most suitable concentration.

Comparative example  3

A composition containing 18% red photochromic pigment, 82% aqueous binder (Finechemtech) and a small amount of fixing agent was prepared and printed in the same manner as in Example 1.

Comparative example  4

An ink composition containing 18% red photochromic pigment, 74% ink resin, and 8% organic solvent was prepared and printed in the same manner as in Example 1. At this time, the amount of DMF contained in the organic solvent was the same as in Example 1, and the ratio of DMF: diluent: dry delay agent was 10: 3: 7.

Example  2 : Printing  Touch evaluation

The ink prepared according to Comparative Examples 3, 4 and Example 1 was printed on PET fabric and the touch was evaluated using the KES-FB test.

The KES-FB test measures the fabric's shape, taking into account six mechanical and physical measurements and sensory evaluations: tensile, bending, shear, surface, compression, weight, and thickness. Is calculated.

[Table 2]

PET white cloth Comparative Example 3 Comparative Example 4 Example T.H.V 3.21 0.42 1.81 2.87

The total hand value (T.H.V) increased from 1 to 5, indicating a soft touch. The PET fabric used in this test had a value of 3.21 before printing.

In the case of Comparative Example 3 using the aqueous binder as a printing method of the general pigment has a value of 0.42, it can be seen that the touch is bad, whereas in the case of the printing method using the ink resin is 2.87 excellent touch feeling (touch) It can be seen. That is, in the case of the example having a result of T.H.V 2.87, the value similar to that of the unprinted PET bag was shown.

In addition, compared to Comparative Example 4 in which the ratio of DMF: drying agent and diluent contained in the organic solvent was 10: 3: 7, the example of 10: 6.5: 3.5 was also excellent in touch (feel). Increasing the ratio of the diluent to the content of the diluent and the dry retardant (Comparative Example 4) lowered the workability at the time of printing without further improving the feel. That is, in the touch feeling, the mixing ratio between the component DMF, the drying agent, and the diluent constituting the organic solvent is a major factor affecting the touch feeling, and when mixed in the ratio proposed in the present invention, it was confirmed that the touch ratio was excellent. It was.

1A and 1B are photographs showing changes in color before and after irradiating sunlight (ultraviolet rays) to the photochromic fiber according to the present invention.

Claims (12)

(i) photochromic pigments selected from the group consisting of red, blue, yellow pigments; Ink resin; Preparing a photochromic ink resin composition by mixing an organic solvent consisting of dimethylformamide (DMF), a diluent and a desiccant, (ii) stamping using a printing plate, and (iii) a method of producing a photochromic fiber comprising the step of drying at 120 ~ 150 ℃, At this time, the photochromic pigment is contained 15% to 25%, the ink resin 65 to 80% by weight relative to the total weight of the ink composition, dimethylformamide in a ratio of 10: 5: 5 to 10: 7: 3 : Diluent: A method for producing a photochromic fiber, comprising 5 to 10% by weight of an organic solvent in which a dry retardant is mixed, based on the total weight of the ink composition. The method of claim 1, The photochromic pigment is a method for producing a photochromic fiber, characterized in that containing 18 to 24% by weight based on the total weight of the ink composition. The method according to claim 1 or 2, The red or blue photochromic pigment is a method for producing a photochromic fiber, characterized in that using 17 to 19% by weight relative to the total weight of the ink. The method according to claim 1 or 2, The yellow photochromic pigment is a method for producing a photochromic fiber, characterized in that using 23 to 25% by weight relative to the total weight of the ink. The method of claim 1, When using the red or blue photochromic pigment ink resin manufacturing method of the photochromic fiber, characterized in that using 70 to 75% by weight relative to the total weight of the ink. The method of claim 1, When the yellow photochromic pigment is used, the ink resin is 65 to 70% by weight based on the total weight of the ink manufacturing method of the photochromic fiber. The method of claim 1, The organic solvent is characterized in that dimethylformamide: diluent: dry retardant is mixed in a ratio selected from the group consisting of 10: 5.5 4.5, 10: 6: 4, 10: 6.5: 3.5 and 10: 7: 3 Method for producing photochromic fiber. The method of claim 1, The organic solvent is a method of producing a photochromic fiber, characterized in that dimethylformamide: diluent: dry retardant is mixed in a ratio of 10: 6.5: 3.5. The method of claim 1, And the ink resin is selected from the group consisting of polyolefin resins, silicone resins, PVC resins, polyurethane resins, and alkyd resins. The method of claim 1, The diluent and the drying delay agent are selected from the group consisting of dimethylformamide, acetonitrile, benzene, chloroform, acetone, cyclohexanone, isopropyl alcohol, methylene chloride, butyl acetate, methyl salicylate, and mixtures thereof. Method for producing a photochromic fiber, characterized in that the material is not the same as each other. The method of claim 1, Method (i) of producing a photochromic fiber, characterized in that for adding a light stabilizer and / or antioxidant. Photochromic fiber produced by the method of claim 1.

Images