TW201602439A - Dyeing composition for polyactic acid fiber material and dyeing process using the same - Google Patents

Abstract

A dyeing composition used for a dyeing process of a polyactic acid fiber material is provided. The dyeing composition includes a dimeric surfactant, a dye and a carrier agent. Based on a total weight of the dyeing composition, the content of the dimeric surfactant is 0.01 wt% to 10 wt%; the content of the dye is 0.1 wt% to 10 wt%; and the content of the carrier agent is 80 wt% to 99.89 wt%.

Description

Dyeing composition for polylactic acid fiber material and dyeing procedure using same

The present invention relates to a dyeing composition and dyeing procedure, and more particularly to a dyeing composition for a polylactic acid fiber material and a dyeing process using the same.

Synthetic polymer materials have long been used as the main materials for various materials in daily life. However, since synthetic polymer materials may cause many problems, such as resource consumption and environmental problems such as pollution, the use of green materials instead of synthetic polymer materials has become an inevitable trend.

Polylactic acid (PLA) is an environmentally friendly fiber material. The polylactic acid fiber material can be obtained by mixing starch extracted from corn or cassava, sugar extracted from sugar cane or sugar beet, and cellulose extracted from straw, and subjected to fermentation, dehydration, or the like. Further, the polylactic acid fiber material is a linear aliphatic thermoplastic polyester which is resistant to sterilization and easy to process, and is non-toxic, non-irritating and biodegradable. (biodegradable) and good biocompatibility. The polylactic acid fiber material has a glass transition temperature of about 60 ° C, a crystallization temperature of about 110 ° C, and a melting point of about 160 ° C. Products made from polylactic acid fiber materials have a smooth surface and are not harmful to the human body, so they are often used in the manufacture of clothing.

Since the glass transition temperature of the polylactic acid fiber material is low, the polylactic acid fiber material is not suitable for the high temperature dyeing technique at a temperature of about 130 ° C in the conventional garment manufacturing process. In addition, the conventional dyes have low dye uptake or leveling property on the polylactic acid fiber material, which causes the dyed polylactic acid fiber material to have a problem that the dye remains on the surface, thereby leading to the dyed polylactic acid fiber material. The washing fastness or light fastness is too low, even dye waste and other environmental problems. Therefore, a dyeing material suitable for a low-temperature dyeing process has been developed, which has good dye uptake and leveling property to polylactic acid fiber materials, and makes the dyed polylactic acid fiber material have high wash fastness and light resistance. Fastness will be a very important topic in this field.

The present invention provides a dyeing composition which is suitable for use in a low temperature dyeing process and which has good dye uptake and leveling properties for polylactic acid fiber materials.

The invention provides a dyeing procedure of a polylactic acid fiber material, wherein the dyed polylactic acid fiber material has good washing fastness and light fastness.

The dyeing composition of the present invention is suitable for use in a dyeing procedure for polylactic acid fiber materials, and the dyeing composition of the present invention includes a symmetric surfactant, a dye, and a carrier. The content of the symmetrical surfactant is 0.01% by weight to 10% by weight based on the total weight of the dyeing composition; the content of the dye is 0.1% by weight to 10% by weight; and the content of the carrier is 80% by weight to 99.89% by weight.

In the dyeing composition according to an embodiment of the present invention, the symmetric surfactant is, for example, an anionic-nonionic symmetric surfactant.

In the dyeing composition according to an embodiment of the present invention, the symmetric surfactant is expressed, for example, by the chemical formula (1): Further, R represents an alkyl group having 7 to 17 carbon atoms, an alkenyl group having 7 to 17 carbon atoms or a cycloalkyl group having 6 to 10 carbon atoms, and n is an integer of 4 to 30.

In the dyeing composition according to an embodiment of the present invention, the content of the symmetrical surfactant is, for example, 0.05% by weight to 0.2% by weight based on the total weight of the dyeing composition.

In the dyeing composition according to an embodiment of the present invention, the content of the dye is, for example, 0.5% by weight to 3% by weight based on the total weight of the dyeing composition.

In the dyeing composition according to an embodiment of the present invention, the pH of the dyeing composition at room temperature is, for example, 2 to 6.

The dyeing procedure of the polylactic acid fiber material of the present invention comprises the following steps. A polylactic acid fiber material is provided. A dyeing composition is provided, wherein the dyeing composition comprises a symmetrical surfactant in an amount of from 0.01% by weight to 10% by weight, a dye in an amount of from 0.1% by weight to 10% by weight, and a content of 80, based on the total weight of the dyeing composition weight % to 99.89% by weight of carrier. The polylactic acid fiber material is dyed using the dye composition.

In the dyeing procedure according to an embodiment of the present invention, dyeing the polylactic acid fiber material with the dyeing composition includes the following steps. In the dip dyeing step, the polylactic acid fiber material is immersed in the dyeing composition at room temperature. In the retarding step, the dyeing composition and the polylactic acid fiber material immersed therein are heated to a temperature of 100 ° C to 110 ° C at a heating rate of 0.5 ° C / min to 5 ° C / min. In the dyeing step, the dyeing composition and the polylactic acid fiber material immersed therein are kept at a temperature of from 100 ° C to 110 ° C for 20 minutes to 60 minutes. Cooling out of the cylinder step, the dyeing composition and the polylactic acid fiber material immersed therein are reduced to 50 ° C ~ 90 ° C at a cooling rate of 0.5 ° C / min ~ 5 ° C / min, and then the polylactic acid fiber material from the dyeing composition Take out.

In the dyeing procedure according to an embodiment of the present invention, the symmetric surfactant is, for example, an anionic-nonionic symmetric surfactant.

In the dyeing procedure according to an embodiment of the present invention, the symmetric surfactant is expressed, for example, by the chemical formula (1): Further, R represents an alkyl group having 7 to 17 carbon atoms, an alkenyl group having 7 to 17 carbon atoms or a cycloalkyl group having 6 to 10 carbon atoms, and n is an integer of 4 to 30.

In the dyeing procedure according to an embodiment of the present invention, the content of the symmetrical surfactant is, for example, 0.05% by weight to 0.2% by weight based on the total weight of the dyeing composition.

In the dyeing procedure according to an embodiment of the present invention, the content of the dye is, for example, 0.5% by weight to 3% by weight based on the total weight of the dyeing composition.

Based on the above, the dyeing composition proposed by the present invention has a symmetric surfactant, whereby the dyeing composition has good leveling property and dye uptake rate for the polylactic acid fiber material. Further, in the dyeing procedure of the polylactic acid fiber material proposed by the present invention, by using the dyeing composition of the present invention, not only the dyeing step can be carried out at a low temperature, but also the dyed polylactic acid fiber material has good washing fastness. And light fastness.

The above described features and advantages of the invention will be apparent from the following description.

In the present specification, the range represented by "a value to another value" is a schematic representation that avoids enumerating all the values in the range in the specification. Therefore, a particular numerical range is recited and is equivalent to the disclosure of any numerical value in the range of the value and the numerical range defined by any value in the numerical range, as the The smaller value range is the same. For example, the description of the "content of 10 to 80%" is equivalent to revealing "including The range is from 20% to 40%" regardless of whether other values are listed in the manual.

In this context, the structure of a compound is sometimes represented by a skeleton formula. This representation can omit carbon atoms, hydrogen atoms, and carbon-hydrogen bonds. Of course, if the atom or atomic group is clearly drawn in the structural formula, the person who prescribes it shall prevail.

Embodiments of the present invention provide a dyeing composition that can be used in a dyeing procedure for polylactic acid fiber materials. The dyeing composition includes a symmetric surfactant, a dye, and a carrier; in addition, an additive such as a pH adjuster, a fixing agent, or a water softener may be added as needed. When the dyeing composition is applied to a dyeing procedure of a polylactic acid fiber material, the dyeing procedure can be carried out at a low temperature, and the dyed polylactic acid fiber material can have good washing fastness and light fastness. The individual components in the dye composition will be described in detail below.

In an embodiment of the invention, the symmetric surfactant allows the dye to have good leveling and dye uptake rates for the polylactic acid fiber material. In other words, the symmetric surfactant can cause the dye to uniformly adhere to the surface of the polylactic acid fiber material, and the symmetric surfactant can increase the adhesion of the dye on the surface of the polylactic acid fiber material.

In the present embodiment, the content of the symmetrical surfactant is 0.01% by weight to 10% by weight, and preferably 0.05% by weight to 0.2% by weight based on the total mass of the dyeing composition. Further, the content of the symmetrical surfactant can be adjusted depending on the actual dyeing conditions. When the content of the symmetric surfactant is less than 0.01% by weight, it may cause the dyeing property and the dye coloring rate to decrease; and when the content of the symmetric surfactant is more than 10% by weight, the dye may be allowed to leave the polylactic acid again. fiber The surface of the material returned to the dyeing composition and the dyeing procedure could not be performed efficiently.

The symmetric surfactant is, for example, an anionic-nonionic symmetric surfactant, and it can be represented by the following chemical formula (1): Wherein R represents an alkyl group having 7 to 17 carbon atoms, an alkenyl group having 7 to 17 carbon atoms or a cycloalkyl group having 6 to 10 carbon atoms, and n is an integer of 4 to 30.

In this embodiment, the symmetric surfactant contains both a hydrophobic group and a hydrophilic group. In detail, in the chemical formula (1), R at the left and right ends is a hydrophobic group, and the hydrophobic group R makes the symmetric surfactant and the dye easily form unstable aggregates. In this way, in the dyeing process, the aggregate will enter the interior of the polylactic acid fiber material and gradually release the dye to improve the contact and/or combination of the dye with the polylactic acid fiber material, thereby achieving uniform dyeing effect. Further, when the carrier of the dyeing composition is water, the hydrophobic group R can effectively lower the surface tension of the water, thereby allowing the dye-containing dyeing composition to be more effectively dispersed on the surface of the polylactic acid fiber material, and the dye is lifted. Opportunity to interact with polylactic acid fiber materials.

In the chemical formula (1), the central portion of -SO ₃ Na dissociates in water to form an anionic hydrophilic group -SO ₃ ^- , while the polyoxyethylene segments (POE) on the adjacent sides (ie, ) is a nonionic hydrophilic group. When the carrier of the dyeing composition is water, the aforementioned hydrophilic group will make the symmetric surfactant more soluble or soluble in water. As a result, when the symmetric surfactant and the poorly water-soluble dye form an aggregate, the aggregate having the dye will be more easily dispersed in the water, thereby improving the dispersibility of the dye in water.

In addition, in the dyeing composition, the symmetric surfactant has a higher moving rate and a lower affinity for the polylactic acid fiber material than the dye, so the symmetric surfactant can occupy the surface of the polylactic acid fiber material first. The reaction position on the upper side, and the occupied reaction position is gradually replaced by the dye. In this way, the dyeing rate of the dye can be slowed down, thereby achieving a uniform dyeing effect.

In an embodiment of the invention, the dye is adsorbed onto the surface of the polylactic acid fiber material by a molecular dyeing force (e.g., hydrogen bonding or van der Waals force) through a dyeing process. The dye may be a disperse dye such as a blue dye (BLUE SF 3-RT 200% GRAN, manufactured by Taiwan Sugar Co.), a red dye (Dianix Rubine SE-B, manufactured by DyStar), a yellow dye. (Dianix Yellow AM-42, manufactured by DyStar), black dye (Goldenlon Black DXF, manufactured by Xiejing) or a combination of the foregoing.

The content of the dye is from 0.1% by weight to 10% by weight, based on the total weight of the dyeing composition, and preferably from 0.5% by weight to 3% by weight. Further, the content of the dye can be adjusted depending on the actual dyeing conditions. When the content of the dye is less than 0.1% by weight, the polylactic acid fiber material cannot be effectively dyed to a desired color; and when the content of the dye is more than 10% by weight, the excess dye may remain in the polylactic acid fiber material. This in turn causes problems with dye waste or environmental pollution.

In an embodiment of the invention, the carrier functions to provide an environment in which the dye and the symmetric surfactant in the dyeing composition can be arbitrarily mixed and/or aggregated. The carrier is, for example, water, ethanol, acetone or a mixed solution thereof. The total weight of the dyed composition The carrier is contained in an amount of from 80% by weight to 99.89% by weight.

Further, in an embodiment of the present invention, the dyeing composition may further include a pH adjusting agent for adjusting the pH of the dyeing composition. The pH of the dyeing composition may be, for example, 2 to 6 at room temperature, and the pH adjusting agent is, for example, glacial acetic acid, formic acid, phosphoric acid or hydrochloric acid. When the pH of the dyeing composition is in the above range, it will be possible to affect the charge of the polylactic acid fiber material, while also increasing the degree of dye dispersion and the speed of its combination with the polylactic acid fiber material.

Based on the above, since the dyeing composition includes a symmetric surfactant, when the polylactic acid fiber material is dyed using the dyeing composition, the dyeing composition can have a good dye uptake rate to the polylactic acid fiber material and The dyeing property can not only achieve the effect of deep dyeing and low temperature dyeing of polylactic acid fiber materials, but also make the dyed polylactic acid fiber material have good washing fastness and light fastness.

Another embodiment of the present invention provides a dyeing procedure for a polylactic acid fiber material which dyes a polylactic acid fiber material using the above-described dyeing composition of the present invention. The dyeing procedure of the present invention can be carried out at a lower temperature than conventional dyeing procedures, and the polylactic acid fiber material dyed by the dyeing procedure of the present invention can have good wash fastness and light fastness.

In the dyeing procedure provided in the present embodiment, the polylactic acid fiber material and the dyeing composition described in the above examples are first provided, and then the polylactic acid fiber material is dyed by the dyeing composition. In the dyeing procedure, the bath ratio of the polylactic acid fiber material to the dye composition is, for example, about 1:10. For example, if you want to weigh When 10 g of the polylactic acid fiber material is dyed, it can be immersed in a dyeing composition having a weight of 100 g.

When the polylactic acid fiber material is dyed using the dyeing composition of the present invention, it may include a dip dyeing step, a retarding step, a dyeing step, and a temperature lowering step. Each step will be described in detail below.

In an embodiment of the invention, the dip dyeing step is, for example, immersing the polylactic acid fiber material in the dyeing composition at room temperature. After the dip step, a slow dyeing step is performed. The retarding step is, for example, heating the dye composition and the polylactic acid fiber material immersed therein to a temperature of from 0.5 ° C / min to 5 ° C / min to 100 ° C to 110 ° C. In the dip dyeing step and the retarding step, the dye in the dyeing composition may be initially adsorbed on the surface of the polylactic acid fiber material, thereby dyeing the polylactic acid fiber material to a color corresponding to the dye.

After the dip dyeing step and the retarding step, the dyeing step is carried out. The dyeing step is, for example, holding the dye composition and the polylactic acid fiber material immersed therein at a temperature of from 100 ° C to 110 ° C for 20 minutes to 60 minutes. In the above dyeing step, retarding step and dyeing step, since the dyeing composition of the present invention contains a symmetric surfactant, the dyeing composition has good properties for the polylactic acid fiber material at a low temperature of 100 ° C to 110 ° C. The dyeing rate and the leveling property are such that the dyed polylactic acid fiber material has good washing fastness and light fastness.

After the dyeing step, a cooling down step is performed. The step of cooling the cylinder is, for example, reducing the dye composition and the polylactic acid fiber material immersed therein to a temperature of about 50 ° C to 90 ° C at a temperature decreasing rate of 0.5 ° C / min to 5 ° C / min, and then dyeing the polylactic acid fiber material from the dyeing. Take out the composition. In addition, after the step of cooling down the cylinder, it is more suitable for dyeing. The polylactic acid fiber material is subjected to steps such as water washing, dehydration, and air drying.

Based on the above, in the dyeing procedure of the present invention, since the polylactic acid fiber material is dyed using the dye composition containing the symmetric surfactant, the dyed polylactic acid fiber material has good washing fastness and light fastness. degree. Further, the temperature range of the dyeing procedure of the present invention is always lower than 130 ° C, so that the dyeing procedure of the present invention has an advantage that it can be carried out at a low temperature as compared with the prior art, and thereby avoids the property of the polylactic acid fiber material. Changed at high temperatures.

<experiment>

The features of the present invention will be more specifically described below with reference to experimental examples and comparative examples. Although the following experiments are described, the materials used, the amounts and ratios thereof, the processing details, the processing flow, and the like can be appropriately changed without departing from the scope of the invention. Therefore, the invention should not be construed restrictively by the experiments described below.

The materials and instruments used in Experimental Example 1 to Experimental Example 4 and Comparative Examples are as follows: Polylactic acid fiber knitted fabric: 8L0309D specification 61" × 215g / y, purchased from Weiqi International Co., Ltd.; symmetrical interface Active agent: , Where n = 8 ~ 9, and methods for their preparation will be described in detail in the following paragraphs; dye: BLUE SF 3-RT 200% GRAN, available from Taiwan Sugar Corporation; carrier: water; acetic acid: CH ₃ COOH, molecular weight 60.05 , the first level of reagents, purchased from the Japanese pharmaceutical company; infrared dyeing machine: model IR 12M, purchased from Linuo Instrument Company.

Preparation example

The aforementioned symmetric surfactant was prepared in the following synthetic steps in that order. However, the following synthetic steps are merely illustrative and not limiting the scope of the invention.

Synthesis of Compound (A)

First, the compound (A) is synthesized, and its reaction formula is as follows:

In detail, the synthesis reaction of the compound (A) includes the following steps. First, a Teflon stir bar and a temperature control rod were placed in a four-neck reaction flask. Next, 2 parts by weight of polyethylene glycol (having an average molecular weight of 400 and n = 8 to 9, a reagent first grade, purchased from Lin Chun Pharmaceutical Co., Ltd.) and 1 part by weight of maleic anhydride (molecular weight) It is 980.6, the reagent level, purchased from Lin Chun Pharmaceutical Co., Ltd.) placed in the above four reaction bottles The temperature was raised to about 60 ° C to uniformly mix the polyethylene glycol with maleic anhydride. Thereafter, a small amount (about 1 gram) of Titanium Tetraisopropanolate was added as a catalyst, and the temperature was gradually raised to about 150 °C. The polyethylene glycol was reacted with maleic anhydride for about 5 hours while maintaining the temperature at 150 ° C to obtain a compound (A).

Synthesis of Compound (B)

Next, the compound (B) is synthesized, and its reaction formula is as follows:

In detail, the synthesis reaction of the compound (B) includes the following steps. First, 1 part by mole of the compound (A) and 2 parts by mole of lauric acid (having a molecular weight of 200.32, a reagent level, purchased from Lin Chun Pharmaceutical Co., Ltd.) were placed in a reaction flask. Next, a small amount (about 1 gram) of tetraisopropyl titanate was added as a catalyst to the reaction flask, and the temperature was gradually raised to about 110 °C. The compound (A) was reacted with lauric acid for 6 hours while maintaining the temperature at 110 ° C to obtain a compound (B).

Synthesis of Symmetrical Surfactants

After that, a symmetric surfactant is synthesized, and the reaction formula is as follows:

In detail, the synthesis reaction of the symmetric surfactant includes the following steps. First, the compound (B) was cooled to about 90 ° C, and an appropriate amount of an aqueous solution of sodium hydrogen sulfite (NaHSO ₃ , molecular weight: 104.07, reagent grade, purchased from Lin Chun Pharmaceutical Co., Ltd.) was added to the reaction flask. Next, the compound (B) was reacted with sodium hydrogen sulfite for 4 hours under reflux to maintain the temperature at about 90 ° C to obtain a symmetric surfactant.

Experimental example 1

First, 10 g of a polylactic acid fiber knitted fabric was provided as a polylactic acid fiber material to be dyed. Next, 100 grams of the dye composition was provided, wherein the symmetric surfactant was 0.05 grams, the dye was 2 grams, and the carrier was water.

Next, the dye composition was poured into a steel cup, and the aforementioned polylactic acid fiber knitted fabric was immersed in the dyeing composition. After that, the steel cup was placed in an infrared dyeing machine, and the steel cup was heated to 110 ° C at a heating rate of 2.5 ° C / min and held for 30 minutes, then the steel cup was lowered to 80 at a cooling rate of 3 ° C / min. °C. Next, the polylactic acid fiber knitted fabric was taken out from the dyeing composition. After that, the dyed polylactic acid The fiber knitted fabric was washed with water, and then dehydrated and air-dried to obtain a dyed polylactic acid fiber knitted fabric of Experimental Example 1.

Experimental example 2

The dyed polylactic acid fiber knitted fabric of Experimental Example 2 was prepared in the same manner as in Experimental Example 1, except that the difference between the two was only that the amount of the symmetric surfactant was 0.1 g.

Experimental example 3

The dyed polylactic acid fiber knitted fabric of Experimental Example 3 was prepared in the same manner as in Experimental Example 1, except that the difference between the two was only that the amount of the symmetric surfactant used was 0.15 g.

Experimental example 4

The dyed polylactic acid fiber knitted fabric of Experimental Example 4 was prepared in the same manner as in Experimental Example 1, except that the difference between the two was only that the amount of the symmetric surfactant was 0.2 g.

Comparative example

The dyed polylactic acid fiber knitted fabric of the comparative example was prepared in the same manner as in Experimental Example 1, except that the difference between the two was only that no symmetrical surfactant was added to the dye composition.

Next, the dyed fast lactic acid fiber knitted fabrics obtained in Experimental Examples 1 to 4 and Comparative Examples were tested for washing fastness, light fastness, and chromatic aberration, respectively, and various test results are shown in Tables 1 to 3, respectively. . The principles and methods of these tests are detailed below.

Washing fastness test and evaluation results

The dyed fastness test of the dyed polylactic acid fiber knitted fabric obtained in Experimental Example 1 to Experimental Example 4 and Comparative Example was tested in accordance with the method specified in AATCC 61 2A.

Preparation of test samples: The dyed polylactic acid fiber knitted fabrics obtained in Experimental Examples 1 to 4 and Comparative Examples were respectively cut into 5 cm × 15 cm samples, and a plurality of fibers were attached to the No. 10 configuration using a general stapler. On each sample, a variety of fiber attachments 10 included acetate, woven, nylon, polyester, acrylic, and acrylic fibers. Weaving and wool weaving.

Test procedure: A water washing tester (model H-12C, purchased from Linault Instruments) was provided, and the switch of the water washing tester was turned on and heated to 49 ° C (± 2 ° C). Each sample was placed in a separate steel cup, and 100 ml of WOB solvent (standard detergent for AATCC wash fastness test) and 50 steel balls were added to each steel cup. Each steel cup was placed in a water washing tester, and after running at 49 ° C ± 2 ° C for 45 minutes, each polylactic acid fiber knitted fabric and cloth were taken out, washed with water and dried.

Evaluation criteria: using AATCC contamination with gray label and each test after the test Acid fiber knitted fabrics are compared to evaluate the level of washing fastness, wherein the number of stages is 5, 4-5, 4, 3-4, 3, 2-3, 2, 1- Grade 2, Grade 1, and the higher the number of grades, the higher the wash fastness. The results of the assessment are recorded in Table 1.

As can be seen from the results of Table 1, the dyed polylactic acid fiber knitted fabrics obtained in Experimental Examples 1 to 4 had higher wash fastness than the comparative examples. In other words, when the dye composition has a symmetric surfactant, the dyed composition can have a better washable polylactic acid fiber knitted fabric than the dye composition without the symmetric surfactant. Fastness.

Light fastness test and evaluation results

The light fastness test of the dyed polylactic acid fiber knitted fabric obtained in Experimental Example 1 to Experimental Example 4 and Comparative Example was carried out in accordance with the method specified in AATCC 16.

Preparation of Test Samples: The dyed polylactic acid fiber knitted fabrics obtained in Experimental Examples 1 to 4 and Comparative Examples were respectively cut into 4 cm × 7 cm samples.

Test procedure: Load each sample into the sample holder and separate the sample holder Placed on a stand of light fastness tester (model: CI 300+, purchased from Linault Instruments). The light fastness tester was started to expose the sample holder for 20 hours. Next, each sample was taken out to complete the light fastness test.

Evaluation Criteria: AATCC fading was performed using gray scales to compare the samples after the test to evaluate the light fastness grade, where the grades were 5, 4-5, 4, 3-4, and 3, respectively. 2-3, 2, 1-2, and 1, and the higher the number, the higher the light fastness. The results of the assessment are recorded in Table 2.

From the results of Table 2, it was found that the dyed polylactic acid fiber knitted fabric obtained by Experimental Example 1 to Experimental Example 4 or Comparative Example of the present invention had a light fastness of up to 4.5 grade. Therefore, when the dyeing composition has a symmetric surfactant, the polylactic acid fiber knitted fabric dyed by the same can have good light fastness.

Strength and assessment results

Using a spectrophotometric colorimeter (SF 600, purchased from Linuo Company), the dyed polylactic acid fiber knitted fabric obtained in the comparative example was used as a standard sample to evaluate the experiment separately. The strength of the dyed polylactic acid fiber knitted fabric obtained in Examples 1 to 4 was recorded in Table 3.

Calculated according to Kubelka-Munk Theory. In Table 3 below, the strength of the comparative example (standard sample) will be set to 100.00.

From the results of Table 3, it was found that when the dyeing compositions of Experimental Examples 1 to 4 had symmetric surfactants, the dyeing compositions of Comparative Examples 1 to 4 were used, compared to the dyeing compositions of Comparative Examples which did not use a symmetric surfactant. The dyed polylactic acid fiber knitted fabric has a large strength. In other words, in the case of the same dye content, the dye composition having a symmetric surfactant can dye the polylactic acid fiber knitted fabric to a darker color, meaning that the dyed composition having a symmetric surfactant can be achieved. Deep dyed function.

In summary, the dye composition proposed by the present invention has a symmetric surfactant, so that the polylactic acid fiber material has good dye uptake, level dyeability and deep dyeability. In addition, by using the dyeing composition of the present invention in a dyeing process, the dyed polylactic acid fiber material can have good washing fastness and light fastness. degree. Furthermore, since the dyeing composition of the present invention has good dye uptake, level dyeing and deep dyeability to the polylactic acid fiber material, the dyeing composition of the present invention can be applied to a low temperature dyeing procedure, thereby avoiding polylactic acid. The properties of the fibrous material change during the dyeing process.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

Claims (12)

A dyeing composition for dyeing a polylactic acid fiber material, the dyeing composition comprising: a symmetric surfactant, the content of the symmetric surfactant is 0.01 based on the total weight of the dyeing composition a weight% to 10% by weight; a dye having a content of the dye of from 0.1% by weight to 10% by weight based on the total weight of the dyeing composition; and a carrier, based on the total weight of the dyeing composition, The carrier is present in an amount of from 80% by weight to 99.89% by weight. The dyeing composition of claim 1, wherein the symmetric surfactant is an anionic-nonionic symmetric surfactant. The dyeing composition according to claim 1, wherein the symmetric surfactant is represented by the chemical formula (1): Wherein R represents an alkyl group having 7 to 17 carbon atoms, an alkenyl group having 7 to 17 carbon atoms or a cycloalkyl group having 6 to 10 carbon atoms, and n is an integer of 4 to 30. The dyeing composition according to claim 1, wherein the symmetrical surfactant is contained in an amount of from 0.05% by weight to 0.2% by weight based on the total weight of the dyeing composition. The dyeing composition according to claim 1, wherein the dye is contained in an amount of from 0.5% by weight to 3% by weight based on the total weight of the dyeing composition. The dyeing composition according to claim 1, wherein the dyeing composition has a pH of 2 to 6 at room temperature. A dyeing procedure for a polylactic acid fiber material, comprising: providing a polylactic acid fiber material; providing a dyeing composition, the dyeing composition comprising: a symmetric surfactant, the symmetric type based on the total weight of the dyeing composition The content of the surfactant is from 0.01% by weight to 10% by weight; the dye is contained in an amount of from 0.1% by weight to 10% by weight based on the total weight of the dyeing composition; and the carrier is composed of the dyeing agent The carrier is contained in an amount of from 80% by weight to 99.89% by weight based on the total weight of the substance. The polylactic acid fiber material is dyed using the dye composition. The dyeing procedure of the polylactic acid fiber material according to claim 7, wherein the dyeing the polylactic acid fiber material by the dyeing composition comprises: a dip dyeing step, and the polylactic acid fiber material is at room temperature Immersing in the dyeing composition; in the retarding step, the dyeing composition and the polylactic acid fiber material immersed therein are heated to a temperature of 100 ° C to 110 ° C at a heating rate of 0.5 ° C / min to 5 ° C / min; a dyeing step of holding the dye composition and the polylactic acid fiber material immersed therein at a temperature of from 100 ° C to 110 ° C for 20 minutes to 60 minutes; and cooling the cylinder step to 0.5 ° C / min to 5 ° C / min Rate of cooling will stain the After the composition and the polylactic acid fiber material immersed therein are lowered to 50 ° C to 90 ° C, the polylactic acid fiber material is taken out from the dyeing composition. The dyeing procedure of the polylactic acid fiber material according to claim 7, wherein the symmetric surfactant is an anionic-nonionic symmetric surfactant. The dyeing procedure of the polylactic acid fiber material according to claim 7, wherein the symmetric surfactant is represented by the chemical formula (1): Wherein R represents an alkyl group having 7 to 17 carbon atoms, an alkenyl group having 7 to 17 carbon atoms or a cycloalkyl group having 6 to 10 carbon atoms, and n is an integer of 4 to 30. The dyeing procedure of the polylactic acid fiber material according to claim 7, wherein the content of the symmetric surfactant is from 0.05% by weight to 0.2% by weight based on the total weight of the dyeing composition. The dyeing procedure of the polylactic acid fiber material according to claim 7, wherein the dye is contained in an amount of from 0.5% by weight to 3% by weight based on the total weight of the dyeing composition.