KR20170133800A - m-Aramid Textile Pretreatment method and Pretreatment Composite for a m-Aramid Textile - Google Patents

Abstract

The present invention relates to a pretreatment processing method for a meta-aramid fiber to make possible digital textile printing of an image with excellent color formation, fastness (sunlight, friction), and flame retardancy with respect to the meta-aramid fiber by treating a pretreatment composition based on an acrylic resin and a pretreatment composition based on a silicone resin to the meta-aramid fiber and a pretreatment composition used in the pretreatment process. The pretreatment processing method of the present invention comprises: a first preprocessing process in which coating processing and padding processing of a first pretreatment composition are performed; a first drying process in which thermal fixing and drying of the first pretreatment composition are performed; a second preprocessing process in which padding processing of a second pretreatment composition is performed; and a second drying process in which thermal fixing and drying of the second pretreatment composition are performed, such that pretreatment processing is completed for digital textile printing of a meta-aramid fiber. Therefore, the present invention makes pretreatment processing for digital textile printing of a meta-aramid fiber possible with low costs, and is suited for both mass production and small quantity production. Moreover, the present invention can represent various colors, and excellently maintain chromogenic properties, sharpness, light fastness, and flame retardancy of a printed image with respect to the meta-aramid fiber.

Description

TECHNICAL FIELD [0001] The present invention relates to a pretreatment method for meta-aramid fibers and a pretreatment composition for meta-aramid fibers,

The present invention relates to a pretreatment method for digital textile printing (DTP) of meta-based aramid fibers and a composition for pretreatment of meta-based aramid fibers used in the stitching method, and more particularly, (Sunlight, friction, washing) and flame proofing on the meta-based aramid fibers by treating the pretreatment composition based on the acrylic resin and the pretreatment composition based on the silicone resin to enable the digital printing of the image having the excellent color and fastness To provide a process for pretreating meta-based aramid fibers and a composition for pretreatment of meta-based aramid fibers optimized for use in stomach preprocessing.

Aramid fibers are largely divided into Meta-liked Aramid fibers and Para-liked Aramid fibers depending on their bonding types. Meta-based aramid fibers are characterized by excellent thermal stability.

The meta-based aramid fiber is a generic term for fibers made from a polymer in which a benzene ring is linked to an amide group at a meta position. Since the meta-based aramid fiber has a melting point of 350 캜, it has excellent heat resistance, flame retardancy and flame retardancy, It is used in various fields such as interior material for clothes and aircraft, industrial filter material, etc. It is also used for general consumer clothing and living materials. (Product name: DuPont company - Nomex, Teijin company - Gonex)

Meta-based aramid fibers are widely used in protective clothing such as fire-fighting clothing because they are excellent in heat resistance, flame retardancy, chemical resistance and radiation resistance. However, it is difficult to penetrate dyes because of its strong molecular structure and dense structure with high crystallinity. (Printing), various researches and developments have been made so far.

One of the ways to improve the dyeability (printing ability) of the meta-based aramid fibers is to improve the dyeability by sputtering treatment or to provide a solution by the treatment with hydrochloric acid and solvent, and by the method of the original by incorporating the pigment into the polymer as a practical means But since the pigment is incorporated into the polymer, the replacement loss of the polymer is not only great, but also it is for mass dyeing of a single color to the meta-based aramid fiber, which is not suitable for a small amount of dyeing or dyeing of various colors, There is a restriction that a heat-resistant pigment should be selected.

There is also proposed a method of dyeing the dye between molecules by loosely modifying the dense fiber structure and a method of loosely modifying the fiber structure and further swelling the dye by using a larger amount of solvent to dye the dye between the molecules. The strength of the aramid fiber is lowered due to the use of a solvent for the modification and the solvent is used in a relaxed structure. In addition, a cost problem is pointed out in that a solvent recovery treatment facility is required in terms of equipment.

On the other hand, as a method for improving the dyeability of aramid fibers, a treatment method using ultra-high temperature and high pressure has been suggested. However, since it is treated at an ultra-high temperature of 190 ° C or more, a high heat resistant dye and heavy equipment are required, have.

The present invention has been made in order to solve the above-mentioned problem of the pretreatment for improving the dyeability (printing ability) of conventional aramid fibers as described above, and it is an object of the present invention to provide an aramid- It enables preprocessing to improve the dyeability (printing ability) of the meta-system aramid fibers, and makes it suitable for both mass production and small-scale production, and enables the expression of various colors. The meta-based aramid fiber (DTP) for metametric aramid fibers, which is completed with a technical point of view, in order to maintain excellent color fastness and sharpness of lightness and light fastness of an image printed on Meta-based aramids optimized for use in pretreatment To provide a pretreatment composition for digital textile printing of fibers.

In order to solve the above-mentioned technical problems, the present invention provides a method for manufacturing a composite fiber, which comprises applying a first pre-treatment composition based on an acrylic resin to a meta-based aramid fiber and padding the composite fiber at a pressure of 1.5 to 4.5 kgf / cm 2 and a speed of 10 to 60 m / The first pretreatment step for impregnating the first pretreatment composition, and the meta-based aramid fiber coated with the first pretreatment composition are dried at a temperature of 130 to 200 ° C to heat-fix and dry the first pretreatment composition The first pre-treatment composition and the second pre-treatment composition based on the silicone resin are applied to the meta-based aramid fiber coated with the composition for the first pre-treatment at a pressure of 1.5 to 4.5 kgf / cm 2 and at a padding speed of 10 to 60 m / ), A second pretreatment step of impregnating the second pretreatment composition, a step of tentering the meta-based aramid fiber coated with the second pretreatment composition at a temperature of 130 to 200 ° C to prepare a second pretreatment composition That the fixed column, and drying the pre-treatment for the meta-type aramid fibers through the secondary drying step for to occur to occur on to the technical features.

The pretreatment method for the digital textile printing of the meta-based aramid fibers proposed in the present invention can be carried out by using the composition based on the acrylic resin, and the digital textile printing of the meta-based aramid fibers can be performed at low cost without using the specialization equipment It is suitable for both mass production and small volume production, and it can express various colors. It is able to express the color and sharpness, fastness, and flame resistance of printed image on meta-system aramid fiber. The expected effect is very beneficial invention.

1 is a process diagram of a pretreatment processing method for digital textile printing of meta-based aramid fibers.
FIG. 2 is a photograph of sample specimens 1, 2, 3, and 4 printed with an image for color comparison.
FIG. 3 is a photograph of sample specimens 5, 6, 7, and 8 on which an image is printed for color comparison.

FIG. 1 is a process diagram of a pretreatment method for digital textile printing of meta-based aramid fibers according to the present invention. As shown in FIG. 1, the present invention comprises a first pre-treatment step by padding a first pre- So that the pretreatment for digital textile printing (DTP) of the meta-based aramid fibers is completed by the steps such as the car drying step, the second pre-treatment step through padding of the second pre-treatment composition, and the second drying step It will be understood that the process of each step will be described below.

≪ Primary Pretreatment Process >

This process is a process for forming a dyeing base on meta-based aramid fibers. The first primer composition based on an acrylic resin is applied to the surface of the meta-based aramid fibers, followed by mangling to obtain meta- So that the composition for pretreating tea is impregnated.

In the present invention, in order to discover the base material (acrylic resin) of the first pre-treatment composition having the most excellent physical properties, four kinds of acrylic resins having different glass transition temperatures (Tg) (INC-01) based on an acrylic resin with a glass transition temperature of 0 ° C through a homogenizer at a speed of 50,000 rpm, and an acrylic resin-based resin having a glass transition temperature of 10 ° C (INC-02), an acrylic resin-based pretreatment composition (INC-03) having a glass transition temperature of 20 ° C and an acrylic resin-based pretreatment composition (INC-04) Using a padding mangle (Mathis, 2-roll padder, HVF Type) with a pick-up ratio of 70 to 80%, meta-aramid fiber specimens with INC-01 to 04 pre- 2 bar Padding the pressure conditions and, through the process of by using a tenter (Tenter) drying at a temperature of 130 ℃ 1 minute and 30 seconds to obtain a sample specimens 1, 2, 3, 4.

To test the chromaticity of each sample specimen subjected to the first pre-treatment, images were printed on a transfer paper at a resolution of 720 × 720 dpi using four color inks of cyan, magenta, yellow and black, and then transferred to a transferring machine at 200 ° C. and 630 rpm The surface reflectance was measured by CCM (Computer Color Matching system) for each color sample, and K / S values were calculated according to Kubelka-Munk equation. The results are shown in Table 1 below.

 division C (660 nm) M (520 nm) Y (450 nm) B (600 nm) Sample Piece 1 6.0758 5.8395 5.6273 7.5835 Sample Piece 2 6.3516 6.3378 5.6699 7.1241 Sample Piece 3 6.4302 6.4774 5.9111 7.4317 Sample Piece 4 6.4565 6.0366 5.8691 8.2336

As shown in Table 1, there was no significant difference, but the overall colorimetry of Sample 3 and Sample 4 was excellent. Magenta and Yellow colors showed excellent coloring in Sample 3, and Cyan and Black The color was excellent in the color reproducibility of Sample Sample 4, which can be confirmed from the naked eye through photographs (see FIG. 2) of each sample sample subjected to transfer printing.

On the other hand, since the function of the first pretreatment composition is required to exhibit a high sharpness with high colorability to a printed image, the sharpness test is carried out through the ink smearing test. , 0.3 mm thick line image (40% C, M, Y, K mixed color) was printed on a 0.3 mm thick sample and the actual sample specimen was measured using a tool microscope (Mitsutoyo TM510) The thickness of each of the warp and weft printed was measured three times, and the average value was obtained. The test results were as shown in Table 2 below.

division Sample Piece 1 Sample Piece 2 Sample Piece 3 Sample Piece 4 Tilt measurement thickness 0.75 0.78 0.73 0.71 Weighing Thickness 0.67 0.68 0.71 0.65

According to the test results, as shown in Table 3 below, the whiskers in the weft direction were higher than those in the warp direction, and the sharpness of all the samples showed no significant difference, and the ink bleed rate About 120%. However, the numerical value of the specimen 4 is the highest.

slope Sample Piece 1 Sample Piece 2 Sample Piece 3 Sample Piece 4
0.3mm
Printing

Weft Sample Piece 1 Sample Piece 2 Sample Piece 3 Sample Piece 4
0.3mm
Printing

Thus, a pretreatment composition (INC-04) based on an acrylic resin having a glass transition temperature (Tg) of 30 DEG C used for pretreatment of sample specimen 4 exhibiting excellent color fastness and excellent whiteness was applied to the base material .

The composition for the first pretreatment based on an acrylic resin includes a raw material for improving the fastness to rubbing, light fastness and flame resistance which can not be satisfied with an acrylic resin. The above raw material is improved in silica for improving friction fastness, A flame retardant for improving flame retardancy and a light-resistance enhancer for preventing deterioration or discoloration / fading caused by exposure to sunlight (ultraviolet, visible light).

In order to find the optimum raw material for improving the fastness to rubbing and light fastness, a composition for the first pretreatment was prepared by mixing alumina or silica and a light stabilizer under the mixing conditions as shown in Table 4.

division The first pretreatment composition ingredient particle
size manufacture company Remarks Raw material input A1 - - - - - Comparative group A2 HP-10 0.5 kg Alumina 10 nm SASOL LP-220 5 kg Light fastener Nika Korea A3 HP-18 0.5 kg Alumina 18nm SASOL LP-220 5 kg Light fastener Nika Korea A4 MSK C-20 0.5 kg Silica 9 탆 GRACE LP-220 5 kg Light fastener Nika Korea A5 SIL-516 0.5 kg Silica 3 탆 China LP-220 5 kg Light fastener Nika Korea

The A1 composition was prepared by mixing 40 to 80 parts by weight of ionic water with 10 to 30 parts by weight (kg) of the pretreated composition (INC-04) based on acrylic resin having a glass transition temperature (Tg) , And the A2 composition to the A5 composition were prepared by mixing the raw materials listed in Table 4 in the respective parts by weight shown in Table 4 with the pretreatment composition (INC-04) prepared by mixing ionic water as described above and stirring the mixture uniformly.

A padding mangle (Mathis, 2-roll padder, HVF Type) with a pick-up ratio of 70 to 80% was used to find raw materials for the first pretreatment composition exhibiting the best coloring degree. , The pretreatment compositions A1 to A5 were padded with a meta-based aramid fiber specimen under a pressure of 2 bar and dried at a temperature of 130 DEG C for 1 minute and 30 seconds using a Tenter machine. A5 was obtained.

In order to test the color development of each sample specimen pretreated with the pretreatment compositions A1 to A5, images were printed on transfer paper at a resolution of 720 x 720 dpi using four color inks of Cyan, Magenta, Yellow, and Black, The sample was transferred to each specimen at 200 ° C and 630 rpm for color development. The surface reflectance was measured by CCM (Computer Color Matching System) for each color sample, and then the Kubelka-Munk equation The results are shown in Table 5 below.

division C (620 nm) K (490 nm) M (520 nm) Y (440 nm) A1 4.532330354 7.117520491 6.441592693 5.43277057 A2 4.282881737 8.362104416 5.612667561 3.767750144 A3 4.097721338 8.030908108 5.595654488 4.051853061 A4 4.384251595 6.850682259 6.880634546 5.416934252 A5 3.661496043 3.94195354 6.194619179 2.205041409

According to the result of the sharpness test, the coloring degree of the sample specimen A1 without adding the raw material was the highest, and the coloring degree of the sample specimen A4 with respect to the cyan, magenta and yellow colors among the remaining sample specimens to which the raw material was added The color of the sample A2 was the highest in the black color and the sample A4 was the highest in the average value of the color intensity.

On the other hand, a sharpness test was performed on the sample specimens A1 to A5 through ink bleedability, and a sharpness test was performed by applying a 0.3 mm thick line image (each of 40% C, M, Y and K mixed colors) We measured the thickness of each of the warp and wefts printed on the actual sample specimen with a 0.3 mm line using a printing microscope (Mitsutoyo, TM510) and a moving image analyzer (EZ Capture) The results are shown in Table 6 below.

division Sample A1 Sample A2 Sample A3 Sample A4 Sample A5 Tilt measurement thickness 0.775 0.765 0.712 0.724 0.848 Weighing Thickness 0.715 0.680 0.633 0.617 0.668

The sample specimen A4 exhibited the most excellent properties even in the result of the measurement of the sharpness, but it did not show a large difference. Given the comprehensive numerical values of the color developability and the sharpness characteristics, printing of the sample specimen A4 pre- The characteristics are most excellent.

Therefore, in order to improve the rub fastness and light fastness in the present invention, the best raw materials to be incorporated into the first pretreatment composition were selected as "silica" and "light fastener". In the present invention, "silica" C-20 product, and LP-220 product of NIKKORIA Co., Ltd. was used as a "light fastener".

In order to find an optimum combination for enhancing flame retardancy, a phosphorus-based flame retardant was compounded with the pretreatment composition A4 described above under the conditions shown in Table 7 below.

division Raw material name input ingredient manufacturer Remarks R1 FR-CU 10 kg Phosphorus flame retardant Kempia R2 FR-CU 20 Kg Phosphorus flame retardant Kempia

Using the padding mangle (Mathis, 2-roll padder, HVF Type) with a pick-up ratio of 70 to 80%, the pretreatment composition of R1 and R2 mixed with the phosphorus- The applied meta-based aramid fibers were padded under a pressure of 2 bar and dried at a temperature of 130 ° C for 1 minute and 30 seconds using a Tenter machine to obtain sample specimens R1 and R2. The Nomex fabric (R3) without pretreatment was prepared and tested for flame resistance using a vertical combustion tester.

The flame retardancy test was carried out by measuring the residual flame, the residual time and the carbonization distance three times according to KS K 0585: 2014, and the flame retardant performance according to the pretreatment composition was discriminated by the average value. The prepared specimen was attached to the specimen fragment of the vertical combustion tester, The flame was removed and flame was removed for 12 seconds under the condition that the flame strength and the distance were adjusted so as not to touch the specimen. According to the results of the measurement of the time of residual flame and the remaining time, ), The flame retardancy was secured to 0 seconds in the warp direction and the warp direction and the remaining time.

The carbonized specimens were folded in the longitudinal direction and stretched by hand along the line connecting the carbonization points. Then, the length of the carbonized portions changed in strength was measured. The measurement results were as shown in Table 8 below.

division Sample Specimen R1 Sample Specimen R2 R3 (Nomex fabric) slope Weft slope Weft slope Weft 1 time 5.5 7.3 4.8 4.6 3.1 3.7 Episode 2 4.6 6 6.6 7.3 2.5 3.1 3rd time 5.0 4.5 7.0 7.5 3.0 Average 5.03 5.9 6.1 6.47 2.8 3.27

The carbonized deformed lengths were shorter in the order of R3, R1, and R2, and the flame retardancy of the sample specimen R1 was superior to that of the sample specimen R2, although the time of the flushing and the charring length characteristics of the sample specimens R1 and R2 were improved.

In the present invention, FR-CU product of Chempia was used as a phosphorus flame retardant incorporated into the first pretreatment composition.

As a result, the composition for the first pretreatment according to the present invention is prepared by mixing 0.5 parts by weight of silica, 10 parts by weight of a phosphorus-containing flame retardant, and 40 parts by weight to 80 parts by weight of a light- The color fastness, friction fastness, light fastness and flame retardancy can be excellently maintained.

The acrylic resin solution used as the base of the first pretreatment composition can be selected according to circumstances or circumstances since the functional difference is not large according to the change of the glass transition temperature (Tg). According to the numerical test data, When the acrylic resin having a transition temperature (Tg) of 30 DEG C was used, the acrylic resin as the base of the composition for the first pretreatment had a glass transition temperature (Tg) of 30 DEG C .

In the first pre-treatment process according to the present invention, an acrylic resin-based first pretreatment composition prepared as described above is applied to meta-based aramid fibers and padded at a pressure of 1.5 to 4.5 kgf / cm 2 and at a speed of 10 to 60 m / and padding the aramid fiber to impregnate the meta-based aramid fiber with an acrylic resin-based first pretreatment composition.

≪ Primary drying step &

This step is a step for heat-setting and drying the first pre-treatment composition. The meta-based aramid fiber coated with the first pre-treatment composition obtained in the above-mentioned process is dried and processed at a temperature of 130 to 200 ° C, (Fixation) and drying are performed on the composition.

≪ Second pre-treatment process >

The present process is a second pre-treatment process for alleviating the stiffness of the meta-based aramid fiber due to application of the acrylic-based first pretreatment composition, wherein the meta-based aramid fiber impregnated with the first pre- To provide flexibility to the rigid meta-based aramid fibers by impregnating the second pre-treatment composition.

Using a padding mangle (Mathis, 2-roll padder, HVF Type) with a pick-up ratio of 70 to 80%, a second primer composition based on a silicone- Aramid fiber specimen (impregnated with the pretreatment composition of INC-01 to 04 through the previous process) under a pressure of 2 bar and dried at a temperature of 130 DEG C for 1 minute and 30 seconds using a Tenter machine The sample specimens 5, 6, 7, and 8 having two layers of the pretreatment composition layer were obtained.

To test the chromaticity of each sample specimen subjected to the second pre-treatment, images were printed on a transfer paper at a resolution of 720 × 720 dpi using four color inks of cyan, magenta, yellow and black, and then transferred at 200 ° C. and 630 rpm The surface reflectance was measured by CCM (Computer Color Matching system) for each sample specimen, and the K / S values were measured according to Kubelka-Munk equation. And the results are shown in Table 9 below.

 division C (660 nm) M (520 nm) Y (450 nm) K (600 nm) Sample 5 6.7083 6.9082 6.0278 7.7139 Sample 6 6.8677 6.7878 6.2321 7.7516 Sample 7 7.1648 7.0903 6.3794 8.5664 Sample 8 7.0530 7.3647 6.1667 8.7684

As shown in Table 9, the overall color of the sample 7 and the sample 8 was excellent. Cyan and yellow colors showed excellent coloring in Sample Specimen 7, and Magenta and Black colors were in Sample Specimen 8 The coloring degree was excellent, which can be confirmed by visual identification through photographs (see FIG. 3) of each sample sample subjected to transfer printing.

On the other hand, since the function of the secondary pretreatment composition is required to exhibit high coloring property and high sharpness (sharpness) with respect to the printed image, the sharpness test is carried out through the ink smearing test. , 0.3 mm thick line image (40% C, M, Y, K mixed color) was printed on a 0.3 mm thick sample and the actual sample specimen was measured using a tool microscope (Mitsutoyo TM510) The thickness of each of the warp and weft printed was measured three times, and the average value was obtained. The test results were as shown in Table 10 below.

division Sample Specimen 5 Sample Piece 6 Sample Piece 7 Sample Piece 8 Tilt measurement thickness 0.70 0.72 0.79 0.76 Weighing Thickness 0.69 0.70 0.73 0.73

As shown in the following Table 11, the sharpness of the weft direction of all the sample specimens was higher than that of the warp direction, and the degree of sharpness of all the samples did not show any significant difference, The rate was about 120% similar.

slope Sample Specimen 5 Sample Piece 6 Sample Piece 7 Sample Piece 8
0.3mm
Printing

Weft Sample 5 Sample 6 Sample 7 Sample 8
0.3mm
Printing

The silicone-based resin-based secondary pretreatment composition includes raw materials for improving the fastness to rubbing and light fastness of the image to be printed and the flame retardancy of the fibers. The stomach materials include silica for improving friction fastness, (Ultraviolet rays, visible light) to prevent deterioration or discoloration or discoloration due to exposure, and a flame retardant for improving flame retardancy.

In order to find an optimum raw material for improving the fastness to rubbing and light fastness, a composition for secondary pretreatment was prepared by mixing alumina or silica and a light stabilizer in a mixing condition as shown in Table 12.

division Secondary pretreatment composition ingredient particle
size manufacturer Remarks Raw material input A1 - - - - - Comparative group A2 HP-10 0.5 kg Alumina 10 nm SASOL LP-220 5 kg Light fastener Nika Korea A3 HP-18 0.5 kg Alumina 18nm SASOL LP-220 5 kg Light fastener Nika Korea A4 MSK C-20 0.5 kg Silica 9 탆 GRACE LP-220 5 kg Light fastener Nika Korea A5 SIL-516 0.5 kg Silica 3 탆 China LP-220 5 gk Light fastener Nika Korea

The A1 composition is composed of only the pretreatment composition based on a silicone resin prepared by mixing 40 to 80 parts by weight of ionized water with 10 to 30 parts by weight (kg) of silicone as a comparative group and stirring well, and the A2 composition and the A5 composition, The raw materials listed in Table 12 were mixed in the respective parts by weight shown in Table 12, and the mixture was uniformly stirred to prepare a mixed silicone resin-based pretreatment composition.

A padding mangle (Mathis, 2-roll padder, HVF Type) with a pick-up ratio of 70 to 80% was used to find the raw material of the second pretreatment composition exhibiting the best coloring degree. Was used to paddle a meta-aramid fiber specimen (impregnated with the first pretreatment composition through a previous process) coated with a secondary pretreatment composition of A1 to A5 having a composition ratio shown in Table 12 under a pressure of 2 bar, And then dried at 130 DEG C for 1 minute and 30 seconds using a tenter machine to obtain sample specimens A1 to A5.

In order to test the color development of each sample specimen pretreated with the pretreatment compositions A1 to A5, images were printed on transfer paper at a resolution of 720 x 720 dpi using four color inks of Cyan, Magenta, Yellow, and Black, The sample was transferred to each specimen at 200 ° C and 630 rpm for color development. The surface reflectance was measured by CCM (Computer Color Matching System) for each color sample, and then the Kubelka-Munk equation The results are shown in Table 13 below.

division C (620 nm) B (490 nm) M (520 nm) Y (440 nm) A1 4.532330354 7.117520491 6.441592693 5.43277057 A2 4.282881737 8.362104416 5.612667561 3.767750144 A3 4.097721338 8.030908108 5.595654488 4.051853061 A4 4.384251595 6.850682259 6.880634546 5.416934252 A5 3.661496043 3.94195354 6.194619179 2.205041409

According to the test results, the color of the sample specimen A1 without adding the raw material was the highest, and the color of the sample specimen A4 was the highest in the cyan, magenta and yellow colors among the remaining sample specimens to which the raw material was added In the black color, the specimen A2 showed the highest colorimetricity. The average value of the colorimetric value was the highest in the specimen A4.

On the other hand, a sharpness test was performed on the sample specimens A1 to A5 through ink bleedability, and a sharpness test was performed by applying a 0.3 mm thick line image (each of 40% C, M, Y and K mixed colors) We measured the thickness of each of the warp and wefts printed on the actual sample specimen with a 0.3 mm line using a printing microscope (Mitsutoyo, TM510) and a moving image analyzer (EZ Capture) The results are shown in Table 14 below.

division Sample A1 Sample A2 Sample A3 Sample A4 Sample A5 Tilt measurement thickness 0.775 0.765 0.712 0.724 0.848 Weighing Thickness 0.715 0.680 0.633 0.617 0.668

The sample specimen A4 exhibited the best properties even in the result of the measurement of the sharpness, but did not show a large difference.

In order to find an optimum combination for improving the flame retardancy, a phosphorus-based flame retardant was compounded with the above-mentioned second pretreatment composition A4 under the conditions shown in Table 15 below.

division Raw material input ingredient manufacturer Remarks R1 FR-CU 10 kg Phosphorus flame retardant Kempia R2 FR-CU 20 kg Phosphorus flame retardant Kempia

Using the padding mangle (Mathis, 2-roll padder, HVF Type) with a pick-up ratio of 70 to 80%, the pretreatment composition of R1 and R2 mixed with the phosphorus- The specimens R1 and R2 were obtained by padding the meta-aramid fiber specimens with a pressure of 2 bar and drying the specimens at a temperature of 130 ° C for 1 minute and 30 seconds using a Tenter machine. Nomex fabric (R3), which had not been pretreated, was prepared and tested for flame resistance using a vertical combustion tester.

The flame retardant test was carried out by measuring the residual flame, residual time and carbonization distance three times according to KS K 0585: 2014, and the flammability performance according to the pretreatment composition was discriminated by the average value. The prepared specimen was attached to the test piece of the vertical combustion tester, The flame was removed and flame was removed for 12 seconds under the condition that the flame strength and the distance were adjusted so as not to touch the specimen. According to the results of the measurement of the time of residual flame and the remaining time, ), The flame retardancy was secured to 0 seconds in the warp direction and the warp direction and the remaining time.

The carbonized specimens were folded in the longitudinal direction and stretched by hand along the line connecting the carbonization points. Then, the length of the carbonized portions changed in strength was measured. The measurement results were as shown in Table 8 below.

division Sample Specimen R1 Sample Specimen R2 R3 (Nomex fabric) slope Weft slope Weft slope Weft 1 time 5.5 7.3 4.8 4.6 3.1 3.7 Episode 2 4.6 6 6.6 7.3 2.5 3.1 3rd time 5.0 4.5 7.0 7.5 3.0 Average 5.03 5.9 6.1 6.47 2.8 3.27

The carbonized deformed lengths were shorter in the order of R3, R1, and R2, and the flame retardancy of the sample specimen R1 was superior to that of the sample specimen R2, although the time of the flushing and the charring length characteristics of the sample specimens R1 and R2 were improved.

In the present invention, FR-CU product of Chempia was used as a phosphorus flame retardant incorporated into the first pretreatment composition.

As a result, the composition for secondary pretreatment according to the present invention is prepared by mixing 0.5 parts by weight of silica, 10 parts by weight of a light fastness enhancer, 10 parts by weight of a phosphorus-based flame retardant, and 40 to 80 parts by weight of ionic water, based on 10-30 parts by weight (Kg) , It is possible to ensure the optimum coloring degree of the printed image and to maintain excellent rubbing fastness, light fastness and flame retardancy.

In the second pre-treatment process according to the present invention, the first pre-treatment composition based on the silicone resin is applied to the meta-based aramid fiber and the padding is performed at a pressure of 1.5 to 4.5 kgf / cm 2 and at a speed of 10 to 60 m / and padding the impregnated aramid fiber to impregnate the meta-based aramid fiber impregnated with the first pretreatment composition to a silicone-based resin-based second pretreatment composition.

≪ Second drying step &

The present process is a finishing process of a pretreatment process for a meta-based aramid fiber. The meta-based aramid fiber coated with the second pre-treatment composition is tentered at a temperature of 130 to 200 ° C through the above- So that the heat is fixed and dried.

Through the respective process steps as described above, the pretreatment for the digital textile printing of the meta-based aramid fibers can be completed. The present invention can provide the dyeability of the meta-based aramid fibers at a low cost ) To improve pre-processing.

The present invention relates to a method for pre-processing meta-based aramid fibers so as to be able to print images of excellent color through a first pre-treatment using a composition based on acrylic resin and a second pre-treatment using a composition based on silicone resin And it is possible to secure the flexibility of the meta-based aramid fiber which has been pretreated while satisfying the color rendering degree.

The present invention is not only suitable for both mass production and small volume production of meta-based aramid fibers with improved dyeability (printing ability), but also enables the expression of various colors, The color fastness and sharpness of the printed image are excellent, and the light fastness and the friction fastness to the printed image can be maintained excellent.

Claims (6)

The first primer composition based on an acrylic resin was applied to the meta-based aramid fibers and padded at a pressure of 1.5 to 4.5 kgf / cm 2 and at a speed of 10 to 60 m / min to prepare meta-based aramid fibers for the first pre- A first pre-treatment step of impregnating the composition,
A first drying step of first drying the meta-based aramid fiber impregnated with the composition for the first pretreatment at a temperature of 130 to 200 ° C to heat-fix and dry the composition for the first pretreatment,
A second primer composition based on a silicone resin was padded on the meta-based aramid fiber impregnated with the first pre-treatment composition at a pressure of 1.5 to 4.5 kgf / cm 2 and at a speed of 10 to 60 m / A second pre-treatment step of impregnating a second pre-treatment composition based on the first pre-
Wherein the meta-based aramid fibers are dried at a temperature of 130 to 200 ° C. to thermally fix and dry the second pre-treatment composition. A preprocessing method for digital textile printing (DTP).
The method of claim 1, further comprising:
The first pretreatment composition is prepared by mixing 0.1 to 2 parts by weight of silica with 10 to 30 parts by weight (kg) of an acrylic resin, 2 to 10 parts by weight of a light fastness enhancer, 5 to 20 parts by weight of a phosphorus flame retardant, and 40 to 80 parts by weight of ionized water (DTP) of meta-based aramid fibers.
The method of claim 1, further comprising:
The second pretreatment composition is prepared by mixing 0.1 to 2 parts by weight of silica with 10 to 30 parts by weight (kg) of a silicone resin, 2 to 10 parts by weight of a light stabilizer, 5 to 20 parts by weight of a phosphorus flame retardant, and 40 to 80 parts by weight of ionized water (DTP) of meta-based aramid fibers. ≪ RTI ID = 0.0 > 11. < / RTI >
The method according to any one of claims 1 to 5,
Wherein the acrylic resin as the basis of the first pretreatment composition has a glass transition temperature (Tg) of 30 ° C. A pre-processing method for digital textile printing (DTP) of meta-based aramid fibers.
(DTP) of meta-based aramid fibers, wherein 0.1 to 2 parts by weight of silica, 2 to 10 parts by weight of a light fastness enhancer, 5 to 10 parts by weight of a phosphorus- 20 parts by weight of water and 40 to 80 parts by weight of ionized water are mixed and stirred to prepare a pretreatment composition.
(DTP) of meta-based aramid fibers, wherein 0.1 to 2 parts by weight of silica, 2 to 10 parts by weight of a light stabilizer, 10 to 30 parts by weight of a phosphorus- 20 parts by weight of water and 40 to 80 parts by weight of ionized water are mixed and stirred to prepare a pretreatment composition.

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