JP2009215686A - After-treatment liquid for inkjet textile printing, and method for inkjet textile printing of fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an after-treatment liquid for inkjet textile printing use which imparts a dyed textile product with high friction fastness without impairing the textile product's color developability and clearness, and to provide a method for inkjet textile printing of fabric which is capable of obtaining a dyed textile product having a combination of high friction fastness and excellent color developability and clearness. <P>SOLUTION: The after-treatment liquid consists of a dispersion with a blocked isocyanate dispersed in water, wherein the dissociation temperature of the blocking agent for the blocked isocyanate is 120-210°C. Alternatively, the after-treatment liquid consists of a dispersion with an active isocyanate dispersed in water. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a post-treatment liquid used for inkjet printing and a method for inkjet printing of fabrics using the post-treatment liquid.

Fabric printing is a method in which a printing ink is applied to the surface of a fabric by a printing method such as screen printing, and then subjected to heat treatment to fix coloring components such as dyes and pigments contained in the printing ink to the fabric. is there. In recent years, an ink jet system widely used in the field of paper printing has been adopted for textile printing. For example, a method is known in which a paste is applied to the surface of a fabric, calendering is performed, and then printing is performed by an inkjet method to form a clear picture (Patent Document 1). However, when such pretreatment is performed to improve color development, coloring components accumulate on the fabric surface without penetrating into the fabric, and the friction fastness tends to deteriorate. On the other hand, in order to improve the friction fastness of the dyed matter printed by the inkjet method, post-processing by heat and pressure is performed after printing (Patent Document 2), and an inkjet ink containing a crosslinked polyurethane dispersion (Patent Document) 3) is known.
JP-A-5-148776 JP 2005-517827 A Special table 2007-522285

However, in the textile printing by the conventional ink jet method, a dyed product having high friction fastness and excellent color development and sharpness has not been obtained yet. In addition, depending on the material of the fabric, there is a problem that post-treatment with heat and pressure for improving friction fastness is difficult, and the texture and flexibility of the fabric itself are impaired (hardened).
The present invention has been made in view of the above circumstances, and a post-treatment liquid for inkjet printing that imparts high friction fastness to a dyed product without impairing color development and sharpness, and high friction fastness. It is an object of the present invention to provide a method for ink-jet printing of a fabric that enables a dyed product having excellent color development and sharpness.

In order to achieve such an object, the post-treatment liquid for inkjet printing of the present invention is a dispersion in which blocked isocyanate is dispersed in water, and the dissociation temperature of the blocking agent of the blocked isocyanate is in the range of 120 to 210 ° C. It was set as such a structure.
In another embodiment of the present invention, the blocked isocyanate content is in the range of 3 to 10% by weight.
In addition, the post-treatment liquid for inkjet printing of the present invention is configured to be a dispersion liquid in which active isocyanate is dispersed in water.
In another embodiment of the present invention, the content of the active isocyanate is in the range of 3 to 10% by weight.

The ink-jet printing method for a fabric of the present invention comprises at least a pretreatment step in which an aqueous dispersion of a cationic polymer is applied to a fabric and dried, a colorant and an anionic binder resin, and the binder resin content is 5 to 5. Using a textile printing ink in the range of 20% by weight, a dyeing process for applying the textile printing ink onto the cloth by an ink jet method, and applying the post-treatment liquid of the present invention to the cloth after the dyeing process and heating. And a post-processing step.
As another aspect of the present invention, the cationic polymer is configured to be polyamine-based.
As another embodiment of the present invention, the post-treatment liquid of the present invention containing a blocked isocyanate is used, and the heating temperature is set in the range of 150 to 220 ° C.
As another embodiment of the present invention, the post-treatment liquid of the present invention containing active isocyanate is used, and the heating temperature is in the range of 110 to 220 ° C.

  Such a post-treatment liquid for inkjet printing according to the present invention reacts with the binder resin of the printing ink to which the isocyanate contained is applied to the fabric by heating to form a coating layer. High friction fastness can be imparted to the dyed product without impairing color development or sharpness. In particular, the post-treatment liquid of the present invention containing a blocked isocyanate has a long pot life, thereby enabling a stable printing process, while the post-treatment liquid of the present invention containing an active isocyanate is effective at a low heating temperature. Therefore, it is possible to print even a fabric that is weak against heat.

  In the inkjet printing method of the present invention, since the cloth is pretreated, the permeation of the applied printing ink into the cloth is moderately suppressed, and the printing ink is present on the cloth surface. Since the coating resin is formed by the reaction between the binder resin of the ink for use and the isocyanate contained in the post-treatment liquid, it is possible to produce a dyed product having excellent color development, sharpness and high friction fastness. Furthermore, when the post-treatment liquid of the present invention containing a blocked isocyanate is used, the pot life is long, thereby enabling stable production, while the post-treatment liquid of the present invention containing an active isocyanate is used. In some cases, printing can be performed even on fabrics that are vulnerable to heat.

Embodiments of the present invention will be described below.
[Post-treatment liquid]
The post-treatment liquid for inkjet printing of the present invention is a dispersion liquid in which blocked isocyanate is dispersed in water. This blocked isocyanate has a dissociation temperature of the blocking agent in the range of 120 to 210 ° C., and examples thereof include Elastron BN69 manufactured by Daiichi Kogyo Seiyaku Co., Ltd. When the dissociation temperature of the blocking agent is less than 120 ° C, it is difficult to set the pot life of the post-treatment liquid long, and when the dissociation temperature exceeds 210 ° C, the heating temperature required after applying the post-treatment liquid is too high, The fabric may be damaged, which is not preferable. The content of such a blocked isocyanate is in the range of 3 to 10% by weight, and if the content of the blocked isocyanate is less than 3% by weight, the effect of the present invention is not achieved, and the content exceeds 10% by weight. And the texture and suppleness of the fabric to be printed itself may be impaired (hardened), which is not preferable.

  Further, the post-treatment liquid for inkjet printing of the present invention is a dispersion liquid in which active isocyanate is dispersed in water. Examples of the active isocyanate contained include Duranate WT20-100, WB40-100, and WB40-80D manufactured by Asahi Kasei Chemicals Corporation. The content of such an active isocyanate is 3 to 10% by weight, preferably 4 to 7% by weight. If the content of the active isocyanate is less than 3% by weight, the effect of the present invention is not achieved. If the content exceeds 10% by weight, the texture and flexibility of the fabric to be printed itself may be impaired (hardened), which is not preferable.

  In such a post-treatment liquid for inkjet printing according to the present invention, the isocyanate contained reacts with the binder resin of the printing ink applied to the fabric by heating to form a coating layer. Therefore, high friction fastness can be imparted to the dyed product without impairing the color development and clearness of the textile printing ink. And the post-treatment liquid of the present invention containing blocked isocyanate has a long pot life, thereby enabling a stable printing process, while the post-treatment liquid of the present invention containing active isocyanate has a low heating temperature, for example, Since the effect is exhibited even at about 80 ° C., it is possible to print even on heat-sensitive fabrics.

[Inkjet printing method]
In the ink jet textile printing method of the present invention, first, an aqueous dispersion of a cationic polymer is applied to the fabric and dried in the pretreatment step. Accordingly, the textile printing ink applied to the fabric is prevented from penetrating into the fabric, and the textile printing ink is present on the fabric surface, thereby making it possible to obtain excellent color development and sharpness. As the cationic polymer, for example, polyamine polycation, dicyandiamide, and the like can be used. Further, the content of the cationic polymer in the aqueous dispersion is not particularly limited and can be, for example, about 1 to 10% by weight.

  Next, in the dyeing process, a printing ink containing at least a colorant and an anionic binder resin is used, and the printing ink is applied onto the fabric by an ink jet method. As the anionic binder resin, for example, a polyurethane resin, an acrylic resin, a styrene acrylic copolymer, or the like can be used. The content of such a binder resin can be appropriately set within a range of 5 to 20% by weight. When the content of the binder resin is less than 5% by weight, sufficient friction fastness cannot be obtained, and when it exceeds 20% by weight, the color developability and sharpness are deteriorated, or the texture and flexibility of the fabric itself are reduced. It may be damaged (becomes hard) and is not preferable.

  Next, in the post-treatment step, the post-treatment liquid of the present invention is applied to the fabric after the dyeing step and heated. By this post-treatment, the binder resin of the textile printing ink and the isocyanate contained in the post-treatment liquid react to form a coating layer, so that a dyed product having excellent color development, sharpness and high friction fastness can be obtained. Can be manufactured. And when using the post-processing liquid containing block isocyanate as a post-processing liquid of this invention, pot life is long and, thereby, stable manufacture is attained. Moreover, the heating temperature in the case of using the post-treatment liquid of the present invention containing a blocked isocyanate can be appropriately set in consideration of the heat resistance of the fabric, and can be set in the range of 150 to 220 ° C., for example. When the fabric has high heat resistance and does not deteriorate such as yellowing, the heating temperature may be set to a higher temperature.

On the other hand, when the post-treatment liquid containing active isocyanate is used as the post-treatment liquid of the present invention, printing can be performed even on fabrics that are vulnerable to heat, and the heating temperature is, for example, 80 to 220 ° C. , Preferably, it can set in the range of 110-220 degreeC.
The above-described embodiment of the present invention is an exemplification, and the present invention is not limited to such an embodiment. The fabric to which the present invention can be applied is not particularly limited, and examples thereof include cotton, polyester, cotton / polyester blend, rayon, polylactic acid, and silk.

Next, the present invention will be described in more detail with specific examples.
[Example 1]
The following two types of pretreatment liquids were prepared as an aqueous dispersion (pretreatment liquid) of a cationic polymer used in the pretreatment step.
(Pretreatment liquid A)
・ Cationic polymer (PAA-HCl-05 manufactured by Nittobo Co., Ltd.) 5 parts by weight Water 95 parts by weight (Pretreatment liquid B)
・ Cationic polymer (PAA-HCl-05 manufactured by Nittobo Co., Ltd.) 5 parts by weight Alumina sol (Alumina sol 520 manufactured by Nissan Chemical Co., Ltd.) 1 part by weight Water 94 parts by weight

  Also, four types of artistry inks (P773: cyan, P715: magenta, P746: yellow, P794: black) manufactured by DuPont were used as printing inks used in the dyeing process.

Moreover, the following 5 types of post-treatment liquids A to E were prepared as post-treatment liquids used in the post-process. Of the following, post-treatment liquid A is the post-treatment liquid of the present invention.
(Post-treatment liquid A)
・ Block isocyanate (Elastotron BN69, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
(Dissociation temperature: 120 ° C.) 5 parts by weight Water 95 parts by weight

(Post-treatment liquid B)
・ Block isocyanate (Elastotron BN77 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
(Dissociation temperature: 120 ° C.) 5 parts by weight Water 95 parts by weight (Post-treatment liquid C)
・ Block isocyanate (Elastolone BN04 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
(Dissociation temperature: 120 ° C.) 5 parts by weight Water 95 parts by weight (Post-treatment liquid D)
・ Block isocyanate (Elastotron BN27 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
(Dissociation temperature: 180 ° C.) 5 parts by weight Water 95 parts by weight

(Post-treatment liquid E)
Polyester resin (Pesresin A-680 manufactured by Takamatsu Yushi Co., Ltd.) 5 parts by weight Aqueous cross-linking agent (Epocross WS700 manufactured by Nippon Shokubai Co., Ltd.) 1 part by weight Water 94 parts by weight Bleaching) (C), polyester (T), and cotton / polyester blend (T / C) were prepared.

<Textile printing>
Using the above two types of pretreatment liquids A and B and the above five types of posttreatment liquids A to E in combinations shown in Table 1 below, the fabric was dyed as follows.
(Pretreatment process)
The pretreatment liquid was applied to the fabric by dipping and dried (100 ° C., 5 minutes).

(Dyeing process)
Inkjet printing was performed on the pretreated fabric using an inkjet printer (DCP-115C, Brother Industries, Ltd.). The pattern used was a stripe shape having a width of 50 mm, and the above-mentioned four kinds of printing inks were used as the ink.
(Post-processing process)
A post-treatment liquid was applied to the fabric after the dyeing process by a dipping method, and then heated at 180 ° C.

<Evaluation>
About the dyeing | staining (samples 1-14) obtained by dyeing | staining as mentioned above, coloring, a bleeding, friction-fastness, fluffing, and washing resistance were evaluated as follows, and a result is shown in following Table 1 Indicated.
(Color evaluation method)
The OD value was measured using a spectrophotometer (X-rite) and evaluated according to the following criteria.
○: Color development is good when the OD value is 1.46 or more.
(Triangle | delta): OD value is 1.31 or more and less than 1.46 makes color development a little favorable.
X: An OD value of less than 1.31 is regarded as poor color development.

(Bleeding evaluation method)
It observed visually and evaluated on the following reference | standard.
○: There was almost no bleeding and a clear pattern was obtained.
Δ: Although there was bleeding, the pattern could be identified.
X: The bleeding was severe and it was difficult to identify the pattern.
(Evaluation method of friction fastness)
Based on JISL-0849, dry and wet friction fastness was evaluated in five stages. A dry evaluation of 4 or higher and a wet evaluation of 3 or higher was considered as a practically acceptable level.

(Evaluation method of fuzz)
The textile printing ink surface after the wet friction fastness evaluation (Gakushin formula) was visually observed and evaluated according to the following criteria.
○: It was good with almost no fuzz.
Δ: Slight fuzz and slight color fading was observed.
X: Fluff was noticeable and discoloration was observed.
(Washing resistance evaluation method)
After the post-treatment, the dyed product is immersed in an aqueous solution (50 ° C) in which a commercially available synthetic detergent (attack manufactured by Kao Corporation) is dissolved for 1 hour, and the color fading after drying is visually observed. It was evaluated with.
○: The textile printing ink hardly flowed and was good.
Δ: Textile ink flowed a little and a decrease in density was observed.
X: Textile ink flowed and a significant decrease in density was observed.

As shown in Table 1, Samples 1 to 3 using the post-treatment liquid A of the present invention all have excellent color development without bleeding, good friction fastness, no fluffing, and washing resistance. Was good.
Further, when comparing the sample 1 and the sample 4, by performing the post-treatment using the post-treatment liquid A of the present invention, even if the pre-treatment is not performed and the dyed matter has a problem in coloring and bleeding, It was confirmed that excellent friction fastness can be imparted, there is no fuzzing, and washing resistance is good.

Further, comparing Samples 1 to 3 and Samples 5 to 7, when post-treatment is not performed, color development and bleeding are almost good, but friction resistance is inferior, fluffing occurs, and washing resistance is poor. It was a thing.
In addition, when Sample 1 and Samples 8 to 11 are compared, when the post-treatment liquid used is not the post-treatment liquid A of the present invention even after the post-treatment, coloring and bleeding are almost good, but friction resistance The fastness was inferior, fuzz was generated, and the washing resistance was poor. In Sample 8 (using post-treatment liquid B), yellowing of the fabric was observed.
Furthermore, when Samples 1 to 3 and Samples 12 to 14 are compared, when pre-treatment and post-treatment are not performed, the printing ink penetrates into the fabric and has good anti-friction resistance, but there is a problem with coloring and bleeding. In addition, fluffing occurred and the washing resistance was poor.

[Example 2]
In the same manner as in Example 1, two types of pretreatment liquids A and B were prepared as aqueous dispersions (pretreatment liquids) of the cationic polymer used in the pretreatment step.
Further, the same printing ink as in Example 1 was prepared as a printing ink used in the dyeing process.

On the other hand, the following two types of post-treatment liquids F and G were prepared as post-treatment liquids used in the post-process. Of the following, the post-treatment liquid F is the post-treatment liquid of the present invention.
(Post-treatment liquid F)
・ Active isocyanate: 5 parts by weight (Duranate WT20-100 manufactured by Asahi Kasei Chemicals Corporation)
・ Water: 95 parts by weight (post-treatment liquid G)
・ Block isocyanate (Elastotron BN69, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
(Dissociation temperature: 120 ° C.) 5 parts by weight Water 95 parts by weight As the fabric, cotton (bleaching) (C), polyester (T), cotton / polyester blend (T / C) ) Was prepared.

<Textile printing>
Using the above two types of pretreatment liquids A and B and the above two types of posttreatment liquids F and G in combinations shown in Table 2 below, the fabric was dyed as follows.
(Pretreatment process)
The pretreatment liquid was applied to the fabric by dipping and dried (100 ° C., 5 minutes).
(Dyeing process)
Inkjet printing was performed on the pretreated fabric using an inkjet printer (DCP-115C, Brother Industries, Ltd.). The pattern used was a stripe shape having a width of 50 mm, and the above-mentioned four kinds of printing inks were used as the ink.
(Post-processing process)
The post-treatment liquid was applied to the fabric after the dyeing process by a dipping method, and then heated at 80 ° C., 110 ° C., or 230 ° C.

<Evaluation>
About the dyeing | staining (samples 15-21) obtained by dyeing | staining as mentioned above, color development, bleeding, abrasion fastness, fluffiness, and washing resistance were evaluated similarly to Example 1, and a result is shown in the following table | surface. It was shown in 2.

As shown in Table 2, the samples 15 to 18 using the post-treatment liquid F of the present invention were excellent without any bleeding despite low heating temperatures (80 ° C. and 110 ° C.) in the post-treatment. The color was maintained, the fastness to friction was good, the fluff was not found, and the washing resistance was good.
Further, when comparing the sample 16 and the sample 19, by performing the post-treatment using the post-treatment liquid F of the present invention, even if the pre-treatment is not performed and the dyed matter has a problem in coloring and bleeding, It was confirmed that excellent friction fastness can be imparted, there is no fuzzing and washing resistance is good.

In addition, since the heating temperature in the post-treatment using the post-treatment liquid G is low (110 ° C.), the sample 20 contains no dissociation of the blocked isocyanate, and the coloration and bleeding are almost good, but the anti-friction durability The properties were inferior, fuzzed, and the washing resistance was poor.
On the other hand, in Sample 21, the heating temperature in the post-treatment using the post-treatment liquid G was set to 230 ° C., so that the contained blocked isocyanate was dissociated, and excellent color development was maintained without bleeding, and the friction fastness was high. It was good, free of fuzz and good washing resistance. However, the fabric was yellowed and could not be put to practical use.
When the fabric has high heat resistance and the post-treatment heating temperature is 230 ° C. or higher and no deterioration such as yellowing occurs, the post-treatment liquid G of the present invention is used at a high temperature. Of course, post-processing may be performed.

  The present invention can be applied to textile printing by various ink jet methods.

Claims (8)

  A post-treatment liquid for inkjet printing, which is a dispersion liquid in which blocked isocyanate is dispersed in water, and the dissociation temperature of the blocking agent of the blocked isocyanate is in the range of 120 to 210 ° C.   The post-treatment liquid for inkjet printing according to claim 1, wherein the content of the blocked isocyanate is in the range of 3 to 10% by weight.   A post-treatment liquid for inkjet printing, which is a dispersion obtained by dispersing active isocyanate in water.   The post-treatment liquid for inkjet printing according to claim 3, wherein the content of the active isocyanate is in the range of 3 to 10% by weight. A pretreatment step of applying an aqueous dispersion of a cationic polymer to a fabric and drying;
A dyeing step of using a printing ink containing at least a colorant and an anionic binder resin, wherein the binder resin content is in the range of 5 to 20% by weight, and applying the printing ink on the fabric by an inkjet method; ,
A post-treatment step of applying the post-treatment liquid according to any one of claims 1 to 4 to the fabric after the dyeing step and heating the fabric.   The method for inkjet printing of a fabric according to claim 5, wherein the cationic polymer is polyamine-based.   7. The fabric inkjet according to claim 5, wherein the post-treatment liquid according to claim 1 or 2 is used as the post-treatment liquid, and the heating temperature is in the range of 150 to 220 ° C. 7. Printing method.   The inkjet of the fabric according to claim 5 or 6, wherein the post-treatment liquid according to claim 3 or 4 is used as the post-treatment liquid, and the heating temperature is in the range of 80 to 220 ° C. Printing method.