Polyamide composite processing yarn

Abstract

A polyamide composite processing yarn mainly composed of a polyamide fiber A and a polyamide fiber B, the terminal amino group content of the polyamide fiber A being 1.3 x 10 ‑5 mol / g or less, and the difference between the terminal amino group content of the polyamide fiber B and that of the polyamide fiber A being 3.0 x 10 ‑5 mol / g or more.

Description

Technical Field

[0001] This invention relates to a polyamide composite processed yarn, specifically, to a composite processed yarn composed of two polyamide fibers with different terminal amino contents, wherein the composite processed yarn has a natural mottled texture after dyeing. Background Technology

[0002] Polyamide fibers possess exceptional flexibility, elastic recovery, abrasion resistance, alkali resistance, moisture absorption, and lightweight properties, making them a vital component of synthetic fibers. However, polyamide fibers are more expensive than polyester fibers. Therefore, to enhance the competitiveness of polyamide fibers and cater to consumers' pursuit of aesthetically pleasing and novel clothing, differentiated polyamide fibers with contrasting color effects have been introduced to the market.

[0003] Chinese patent CN111058146A, Japanese patent JP2015-137443, Japanese patent JP2005-519204, and international patent WO2017 / 091159 all disclose the process of spinning a composite yarn of cationic modified polyamide and ordinary polyamide, which produces a color-changing effect when dyed with cationic dyes. However, the large steric hindrance of the cationic dyeing groups leads to a decrease in the strength of the cationic modified polyamide fibers. Furthermore, the addition of cationic modification groups means that dyeing with ordinary acidic dyes will not produce a color-changing effect; cationic dyes must be used. Using cationic dyes requires process modifications, which is not conducive to continuous production and increases production costs. Summary of the Invention

[0004] The purpose of this invention is to provide a composite processed yarn that is simple to produce, has an excellent hand feel, and exhibits a color-mixing effect after being dyed with acid dyes.

[0005] The technical solution of the present invention is as follows:

[0006] A polyamide composite processed yarn is mainly composed of polyamide fiber A and polyamide fiber B. The terminal amino content of polyamide fiber A is 1.3 × 10⁻⁶. -5 The content of the polyamide fiber B is below mol / g, and the difference in terminal amino content between the polyamide fiber B and the polyamide fiber A is less than 3.0 × 10⁻⁶ mol / g. -5 Above mol / g.

[0007] The preferred composite ratio of polyamide fiber A and polyamide fiber B is 1:3 to 3:1.

[0008] After the polyamide composite processed yarn is made into a woven fabric, the L values ​​of the dark and light colored areas are determined using the JIS Z 8722.5 method. * Values, light and dark shades L *The difference in values ​​is 10 to 50. The lighter-colored areas are preferably distributed in the form of dots or stripes.

[0009] The number of interlacing elements in the polyamide composite filament is less than 150 per m, preferably less than 100 per m.

[0010] Because there is a difference in the terminal amino groups of the two polyamide fibers constituting the polyamide composite processed yarn of the present invention, and the terminal amino group content of polyamide fiber A with a lower terminal amino group value is 1.3 × 10⁻⁶. -5 The concentration of dyes below mol / g allows for excellent color mixing in polyamide composite fiber dyeing, and acid dyes can be used for dyeing, which facilitates continuous production and reduces costs.

[0011] Instruction manual illustrations

[0012] Figure 1 This is a photograph of the fabric after dyeing in Example 1.

[0013] Figure 2 This is a photograph of the fabric after dyeing in Example 2.

[0014] Figure 3 This is a photograph of the fabric after dyeing in Example 3.

[0015] Figure 4 This is a photograph of the fabric after dyeing in Example 4.

[0016] Figure 5 This is a photograph of the fabric after dyeing in Example 5.

[0017] Figure 6 This is a photograph of the fabric after dyeing in Example 6.

[0018] Figure 7 This is a photograph of the fabric after dyeing in Example 7.

[0019] Figure 8 A photograph of the fabric after dyeing, for comparison example 1.

[0020] Figure 9 A photograph of the fabric after dyeing, as shown in Comparative Example 2.

[0021] Figure 10 A photograph of the fabric after dyeing, for comparison example 3.

[0022] Figure 11 A photograph of the fabric after dyeing, for comparison example 4.

[0023] The above Figures 1 to 11 All photos were taken at 4x magnification. Detailed Implementation

[0024] There are generally two methods to achieve color mixing in polyamide fibers in existing technologies. One method is to composite-spin ordinary polyamide with other polymers with different dyeing mechanisms to obtain composite processed yarn. The other method is to modify polyamide so that it can be dyed with non-acid dyes or not dyed with acid dyes, and then composite-spin the modified polyamide and ordinary polyamide to obtain composite processed yarn. Although both methods can achieve color mixing, the first method, which involves mixing in other polymer fibers, results in composite processed yarn having poorer hand feel, elasticity, and acid and alkali resistance than polyamide yarn alone. The second method, which involves modified polyamide, has poorer physical properties such as strength, elongation, and elasticity than ordinary polyamide, resulting in composite processed yarn with poor strength, elongation, and elasticity.

[0025] This invention provides a composite processed yarn made entirely of ordinary polyamide, and fabrics made from it have a color-mixing effect when dyed with acid dyes.

[0026] The composite processed yarn of this invention is mainly composed of polyamide fiber A and polyamide fiber B, wherein the terminal amino content of polyamide fiber A is 1.3 × 10⁻⁶. -5 The content of the polyamide fiber B is below mol / g, and the difference in terminal amino content between the polyamide fiber B and the polyamide fiber A is less than 3.0 × 10⁻⁶ mol / g. -5 Above mol / g.

[0027] When the terminal amino content of the polyamide fiber A is 1.3 × 10⁻⁶ -5 When the concentration is below mol / g, there are few groups binding to the dye molecules, resulting in a very low dye uptake rate. The difference in terminal amino content between polyamide fiber B and polyamide fiber A is 3.0 × 10⁻⁶. -5 A concentration of mol / g or higher ensures two things: first, that polyamide fiber B has a good dye uptake rate when dyed with acidic dyes; and second, that the dyeing effects of polyamide fiber B and polyamide fiber A have sufficient difference, resulting in a mixed-color effect in the fabric. If the difference in terminal amino content between polyamide fiber B and polyamide fiber A is less than 3.0 × 10⁻⁶ mol / g... -5 The color difference between the two fibers was not obvious after dyeing at mol / g. Although a larger difference in the content of terminal amino groups resulted in a better color difference in the polyamide composite processed yarn, if the difference in the content of terminal amino groups was too large, the polyamide composite processed yarn would easily turn yellow under the influence of light, heat, and moisture due to the excessively high content of terminal amino groups in polyamide fiber B.

[0028] In a polyamide composite filament, if the content of polyamide fiber A is too low, the light-dyed portion will be less exposed after dyeing, resulting in the polyamide composite filament appearing darkly dyed overall, with an indistinct color contrast effect. Conversely, if the content of polyamide fiber A is too high, the dark-dyed portion will be less exposed after dyeing, resulting in the polyamide composite filament appearing lightly dyed overall, with an indistinct color contrast effect. To ensure that both light and dark dyed portions are exposed after dyeing, thereby achieving an excellent color contrast effect in the polyamide composite filament, the present invention preferably uses a composite ratio of polyamide fiber A to polyamide fiber B of 1:3 to 3:1.

[0029] The composite ratio of polyamide fiber A and polyamide fiber B also affects the pattern distribution of the subsequent color-mixing effect on the fabric. With a lower content of polyamide fiber A, the lighter-colored areas on the fabric gradually transform into a dotted distribution; while with a lower content of polyamide fiber B, the lighter-colored areas gradually transform into a striped distribution. The range of the composite ratio of polyamide fiber A and polyamide fiber B can be selected based on the desired color-mixing effect without affecting the color-mixing effect.

[0030] The polyamide fiber described in this invention refers to a synthetic fiber formed from a polymer containing amide bonds in its main chain, including aliphatic polyamide fibers, alicyclic polyamide fibers containing aliphatic rings, and aliphatic polyamide fibers containing aromatic rings. Simultaneously, functional particles, such as titanium dioxide particles that impart impermeability to the fiber, can be added to the fiber. The amount of functional particles added should be such that it does not affect the fiber's physical properties. Specifically, polyamide 6, polyamide 66, polyamide 56, polyamide 610, polyamide 1010, polyamide 612, polyamide 11, polyamide 12, bio-based polyamide, polymer-recycled polyamide, copolymerized modified polyamide, etc., can be selected.

[0031] The color mixing effect of the composite processed yarn described in this invention is mainly determined by the difference in terminal amino content between polyamide fiber B and polyamide fiber A, and is less affected by fineness. However, considering the hand feel of the composite processed yarn and the fabric, the total fineness of the composite processed yarn is preferably below 150 dtex. Since polyamide fibers are relatively soft, if the single filament fineness is too small, the color mixing effect will be diluted due to increased light scattering. Conversely, if the single filament fineness is too large, it will affect the hand feel of the composite processed yarn and the fabric. Therefore, the single filament fineness is preferably between 0.5 and 1.2 dtex.

[0032] The processing method of the composite filament can be as follows: the two fibers are combined after passing through a cross-linking nozzle; the two fibers are pre-cross-linked and then false-twisted together to form DTY fibers; they can be false-twisted separately and then combined at the cross-linking nozzle; or one fiber is false-twisted and then combined with another FDY fiber, etc. The choice can be made according to the desired color mixing effect.

[0033] The color mixing effect achieved by dyeing the composite processed yarn described in this invention after it has been individually fabricated into a textile can be achieved through the mixing of light and dark color portions. * The difference in values ​​is characterized by the difference in terminal amino content between polyamide fiber B and polyamide fiber A. This difference is primarily determined by the difference in terminal amino content between the two fibers. When the difference in terminal amino content is less than 3.0 × 10⁻⁶, the difference is considered significant. -5 At mol / g, the light and dark parts L * The difference in values ​​is too small to show a noticeable color mixing effect. This invention preferably uses a combination of light and dark color areas (L). * The difference in values ​​is 10 to 50.

[0034] The number of interlacing points in the composite processing yarn after passing through the interlacing nozzle affects the pattern distribution of the color mixing effect on the subsequent fabric. Considering the throughput of high-level projects, the interlacing pressure is generally controlled at 1.5 kg / m. 2 The following measures are taken to control the number of interlacing elements to below 150 per meter, preferably below 100 per meter, so that the light-colored areas on the fabric appear as dots or stripes.

[0035] Considering that the composite processed yarn of the present invention is applied to textiles, the U% of the composite processed yarn along the fiber axis should not be large and should be controlled below 1.5 (H).

[0036] This invention involves compounding polyamide fibers with low and high terminal amino content to obtain a composite yarn that does not alter the hand feel of the polyamide fibers and exhibits high strength and color-mixing effect after acid dyeing. Fabrics prepared from this composite yarn possess excellent softness and a natural mottled texture.

[0037] The testing method involved in this invention is as follows:

[0038] (1) Terminal amino content

[0039] After drying the sample for more than 2 hours, accurately weigh 1g of the sample and add 50ml of a mixed solution of PEA (80% phenol and 20% ethanol). After shaking to dissolve, add 2 drops of TB (thymol blue) indicator and titrate with N / 50 hydrochloric acid. Stop titrating when the solution color changes from yellow to slightly red and read the titration amount A of the sample. Perform a blank titration of 50ml of PEA and read the titration amount B. Calculate the content of the terminal amino group using the following formula.

[0040] Terminal amino group content = 2(AB)*F / (100000*sample weight),

[0041] F represents the titration value of N / 50 hydrochloric acid, which is 0.02 mol / L.

[0042] (2)L * Value difference

[0043] (a) Fabric making

[0044] Eight spools of 70T-68F-DTY polyamide composite yarn were used to produce circular knitted fabric on a 28-needle circular knitting machine (manufacturer: SANTONI) (needle count: 1440, speed: 16 rpm, design weight: 140 g / m²). 2 ).

[0045] (b) Refining process

[0046] Prepare a refining agent solution (use soft water, add 2g / L of refining agent, and stir evenly). Then, put the polyamide fabric and the refining agent solution into the dyeing machine at a bath ratio of 1:30, and keep it at 80℃ for 20 minutes to complete the refining.

[0047] (c) Staining and fixing

[0048] Prepare the dye solution (using soft water to mix 2 g / L leveling agent and 2 g / L nylon dyeing acid to form an auxiliary agent solution; then, according to the weight of the greige fabric, add 0.5 owf% black acid dye to the auxiliary agent solution and stir well to form the dye solution). Then, place the refined polyamide woven fabric and the dye solution into the dyeing machine at a liquor ratio of 1:30 and maintain the temperature at 98℃ for 45 minutes. Next, mix 3 owf% tannic acid fixing agent with soft water and add it to the dyed polyamide woven fabric in the dyeing machine. Maintain the temperature at 80℃ for 20 minutes to fix the color, completing the dyeing process. Finally, place the dyed polyamide woven fabric into a fabric setting machine and maintain the temperature at 160℃ for 1 minute to complete the setting process.

[0049] (d) Intensity / Distance Range L * Value determination

[0050] The polyamide knitted fabric that had undergone dyeing and setting was tested using JIS Z 8722.5 method. The polyamide composite processed yarns were extracted from the fabric, and the dark-dyed and light-dyed yarns were separated. Yarn samples were prepared separately using a yarn color charting machine (Nantong Sansi, Y108 type) under conditions of 5g winding tension and 12 layers. The L values ​​of the dark-dyed and light-dyed samples were then measured separately. * Value, L * Value difference = darker shade L * Value - Light color part L * value.

[0051] (3) Weight of the fabric

[0052] The weight of the fabric was determined according to standard ASTM D3776 / 2646.

[0053] (4) Strength of the processed wire

[0054] The strength of the fiber was tested according to standard GB / T14344-2008.

[0055] (5) Number of contacts

[0056] According to standard FZ / T50001-2005, the test method is as follows: First, apply an initial load of 0.1 cN / dtex to the yarn, then mark a certain length on the yarn, usually 1 m, and measure the number of interlacings of the yarn within 1 m after applying the load for 30 s.

[0057] (6) CF value

[0058] The CF value of the fiber was tested using an automated crosslinking degree tester (ENTANGLEMENT TESTER-2040 manufactured by Rothschild) according to the method described in JIS L 1013 (2010).

[0059] Example 1

[0060] The terminal amino group content is 0.5 × 10 -5 The content of terminal amino groups in polyamide fiber A is 4.3 × 10 mol / g. -5 Polyamide fiber B, in a 1:1 ratio, is compounded at a crosslinking pressure of 0.8 kg / m². 2 Composite processed yarns were obtained under specific conditions, and their strength, interlacing number, and CF value were tested. After being made into woven fabrics, the composite processed yarns were dyed and fixed with a 0.50 owf% black acid dye. The fabric weight, light and dark portion L... * The values ​​are shown in Table 1, and the distribution effect of the mixed color pattern is shown in Table 1. Figure 1 .

[0061] Example 2

[0062] The terminal amino group content is 0.8 × 10 -5 The content of terminal amino groups in polyamide fiber A is 4.3 × 10 mol / g. -5 The composite was obtained by compounding polyamide fiber B in a 3:1 ratio with a crosslinking pressure of 0.8 kg / m. 2 Composite processed yarns were obtained under specific conditions, and their strength, interlacing number, and CF value were tested. After being made into woven fabrics, the composite processed yarns were dyed and fixed with a 0.50 owf% black acid dye. The fabric weight, light and dark portion L... * The values ​​are shown in Table 1, and the distribution effect of the mixed color pattern is shown in Table 1. Figure 2 .

[0063] Example 3

[0064] The terminal amino group content is 1.3 × 10 -5 The content of terminal amino groups in polyamide fiber A is 4.3 × 10 mol / g. -5The composite was obtained by compounding polyamide fiber B at a ratio of 1:3 with a crosslinking pressure of 0.8 kg / m. 2 Composite processed yarns were obtained under specific conditions, and their strength, interlacing number, and CF value were tested. After being made into woven fabrics, the composite processed yarns were dyed and fixed with a 0.50 owf% black acid dye. The fabric weight, light and dark portion L... * The values ​​are shown in Table 1, and the distribution effect of the mixed color pattern is shown in Table 1. Figure 3 .

[0065] Example 4

[0066] The terminal amino group content is 0.8 × 10 -5 The content of terminal amino groups in polyamide fiber A is 6.5 × 10 mol / g. -5 Polyamide fiber B, in a 1:1 ratio, is compounded at a crosslinking pressure of 0.8 kg / m². 2 Composite processed yarns were obtained under specific conditions, and their strength, interlacing number, and CF value were tested. After being made into woven fabrics, the composite processed yarns were dyed and fixed with a 0.50 owf% black acid dye. The fabric weight, light and dark portion L... * The values ​​are shown in Table 1, and the distribution effect of the mixed color pattern is shown in Table 1. Figure 4 .

[0067] Example 5

[0068] The terminal amino group content is 0.8 × 10 -5 The content of terminal amino groups in polyamide fiber A is 9.5 × 10 mol / g. -5 The composite was obtained by compounding polyamide fiber B in a 1:1 ratio with a crosslinking pressure of 0.8 kg / m. 2 Composite processed yarns were obtained under specific conditions, and their strength, interlacing number, and CF value were tested. After being made into woven fabrics, the composite processed yarns were dyed and fixed with a 0.50 owf% black acid dye. The fabric weight, light and dark portion L... * The values ​​are shown in Table 1, and the distribution effect of the mixed color pattern is shown in Table 1. Figure 5 .

[0069] Example 6

[0070] The terminal amino group content is 0.5 × 10 -5 The content of terminal amino groups in polyamide fiber A is 4.3 × 10 mol / g. -5 Polyamide fiber B, in a 1:1 ratio, is compounded at a crosslinking pressure of 1.5 kg / m². 2Composite processed yarns were obtained under specific conditions, and their strength, interlacing number, and CF value were tested. After being made into woven fabrics, the composite processed yarns were dyed and fixed with a 0.50 owf% black acid dye. The fabric weight, light and dark portion L... * The values ​​are shown in Table 1, and the distribution effect of the mixed color pattern is shown in Table 1. Figure 6 .

[0071] Example 7

[0072] The terminal amino group content is 0.5 × 10 -5 The content of terminal amino groups in polyamide fiber A is 4.3 × 10 mol / g. -5 Polyamide fiber B, in a 1:1 ratio, is compounded at a crosslinking pressure of 2.0 kg / m². 2 Composite processed yarns were obtained under specific conditions, and their strength, interlacing number, and CF value were tested. After being made into woven fabrics, the composite processed yarns were dyed and fixed with a 0.50 owf% black acid dye. The fabric weight, light and dark portion L... * The values ​​are shown in Table 1, and the distribution effect of the mixed color pattern is shown in Table 1. Figure 7 .

[0073] Comparative Example 1

[0074] The terminal amino group content is 0.8 × 10 -5 The content of terminal amino groups in polyamide fiber A is 1.3 × 10 mol / g. -5 When polyamide fiber B is compounded at a ratio of 1:1 with a mol / g polyamide fiber, the crosslinking pressure is 0.8 kg / m². 2 Composite processed yarns were obtained under specific conditions, and their strength, interlacing number, and CF value were tested. After being made into woven fabrics, the composite processed yarns were dyed and fixed with a 0.50 owf% black acid dye. The fabric weight, light and dark portion L... * The values ​​are shown in Table 1, and the distribution effect of the mixed color pattern is shown in Table 1. Figure 8 .

[0075] Because the difference in the terminal amino content between polyamide fiber B and polyamide fiber A is less than 3.0 × 10⁻⁶. -5 mol / g, L of light and dark areas after dyeing of the fabric * The value difference is small, so the color difference effect is not apparent.

[0076] Comparative Example 2

[0077] The terminal amino group content is 6.5 × 10 -5 The content of terminal amino groups in polyamide fiber A is 9.5 × 10 mol / g. -5 Polyamide fiber B, in a 1:1 ratio, is compounded at a crosslinking pressure of 0.8 kg / m². 2Composite processed yarns were obtained under specific conditions, and their strength, interlacing number, and CF value were tested. After being made into woven fabrics, the composite processed yarns were dyed and fixed with a 0.50 owf% black acid dye. The fabric weight, light and dark portion L... * The values ​​are shown in Table 1, and the distribution effect of the mixed color pattern is shown in Table 1. Figure 9 .

[0078] Because both polyamide fiber A and polyamide fiber B have high terminal amino content, even if the difference between the two reaches 3.0 × 10⁻⁶, -5 mol / g, the L of the light and dark parts of the woven fabric after dyeing * The value difference is small, so the color difference effect is not apparent.

[0079] Comparative Example 3

[0080] The terminal amino group content is 1.5 × 10 -5 The content of terminal amino groups in polyamide fiber A is 6.5 × 10 mol / g. -5 Polyamide fiber B, in a 1:1 ratio, is compounded at a crosslinking pressure of 0.8 kg / m². 2 Composite processed yarns were obtained under specific conditions, and their strength, interlacing number, and CF value were tested. After being made into woven fabrics, the composite processed yarns were dyed and fixed with a 0.50 owf% black acid dye. The fabric weight, light and dark portion L... * The values ​​are shown in Table 1, and the distribution effect of the mixed color pattern is shown in Table 1. Figure 10 .

[0081] Because both polyamide fiber A and polyamide fiber B have high terminal amino content, even if the difference between the two reaches 3.0 × 10⁻⁶, -5 The L of the light and dark parts of the woven fabric after dyeing is above mol / g. * The value difference is small, so the color difference effect is not apparent.

[0082] Comparative Example 4

[0083] The cationic polyamide fiber C has a terminal amino content of 4.3 × 10⁻⁶. -5 Polyamide fiber B, in a 1:1 ratio, is compounded at a crosslinking pressure of 0.8 kg / m². 2 Composite processed yarns were obtained under specific conditions, and their strength, interlacing number, and CF value were tested. After being made into woven fabrics, the composite processed yarns were dyed and fixed with a 0.50 owf% black cationic dye. The fabric weight, light and dark portion L... * The values ​​are shown in Table 1, and the distribution effect of the mixed color pattern is shown in Table 1. Figure 11 .

[0084] The low strength of cationic polyamide fiber C results in low overall strength of the polyamide composite fiber.

[0085]

Claims

1. Polyamide composite processed yarn, mainly composed of polyamide fiber A and polyamide fiber B, is characterized by: The polyamide fiber A has a terminal amino content of 1.3 × 10⁻⁶. -5 The content of the polyamide fiber B is below mol / g, and the difference in terminal amino content between the polyamide fiber B and the polyamide fiber A is less than 3.0 × 10⁻⁶ mol / g. -5 The concentration of the composite processed yarn is above mol / g; after the composite processed yarn is made into a woven fabric and dyed and fixed with acid dye, the L concentration of the dark and light parts is determined by JIS Z 8722.5 method. * Values, light and dark shades L * The difference in values ​​is 10 to 50.

2. The polyamide composite processed filament according to claim 1, characterized in that: The composite ratio of polyamide fiber A and polyamide fiber B is 1:3 to 3:

1.

3. The polyamide composite processed filament according to claim 2, characterized in that: The light-colored areas are distributed in the form of dots or stripes.

4. The polyamide composite processed filament according to claim 3, characterized in that: The number of interlacing elements in the composite processing wire is less than 150 per meter.

5. The polyamide composite processed filament according to claim 4, characterized in that: The number of interlacing elements in the composite processing wire is less than 100 per meter.

Images