Single-color-spectrum or double-color-spectrum polyester-cotton jacquard fabric dyed through one-step method and dyeing method

Abstract

The invention discloses a one-step dyeing monochromatic spectrum or double-chromatic spectrum polyester-cotton jacquard fabric and a dyeing method, the polyester-cotton jacquard fabric only uses one natural dye, dyeing of two kinds of polyester-cotton fibers is achieved through one-step dyeing, and the jacquard fabric with the same color spectrum (monochromatic spectrum) or different color spectrum (double color spectrum) of polyester-cotton is obtained. The process comprises the following steps: extracting a plant pigment, adding the plant pigment, a pH value regulator and water into a dye vat to form a dye liquor with the pH value of 5-8, adding the polyester-cotton fabric into the dye vat for dyeing at the dyeing temperature of 100-120 DEG C, and keeping the temperature for 60-90 minutes. The medicinal plant pigment is adopted to replace disperse dye capable of dyeing polyester and reactive dye capable of dyeing cotton, one-step dyeing of polyester and cotton in the polyester-cotton fabric is achieved, the process that cotton and polyester need to be dyed respectively in a traditional dyeing method is shortened, the dyeing method is simple, only a small amount of acid-base regulator is needed in the period, and the cost is low. The emission and the energy consumption in the existing dyeing method are greatly reduced, and the method is green and environment-friendly.

Description

Technical Field

[0001] The invention relates to the field of textile fabrics and dyeing technology such as home textile clothing, and in particular to a one-step dyeing method of polyester-cotton home textile and clothing jacquard fabrics with natural dyes. Background Art

[0002] Entering the 21st century, the development of science and technology pays more attention to environmental protection and ecological balance, and people cherish the earth more. With the improvement of people's living standards, the quality requirements for textiles are getting higher and higher, and the call for "returning to nature" is becoming stronger and stronger. People pursue comfort, nature and health in clothing, so increasing the added value of textiles and making products diversified, functional and high-end is the development direction of textile finishing.

[0003] Polyester / cotton jacquard fabrics have the skin-friendly hygroscopicity of natural cellulose and the wear resistance and shape retention of polyester, and are widely used in clothing and home textile fabrics. At present, the dyeing mainly adopts disperse dyes to dye polyester and reactive dyes to dye cotton. The two-bath two-step method is generally used to dye two fibers with two dyes, that is, first dye the polyester in the disperse dye acid bath, and then enter the reactive dye alkaline bath to dye the cotton. However, the process is complicated, the chemical dyes used are not conducive to environmental protection, the two-step process is long, and the emissions and energy consumption are large.

[0004] The existing technology has developed a "one-bath one-step dyeing method for polyester-cotton knitted fabrics" based on the "two-bath two-step method". Yagerxin chemical synthetic dyes are used to dye polyester-cotton blended knitted fabrics in one bath one step. However, chemical auxiliaries such as sodium sulfate and dyeing auxiliary SP need to be added in the process, which is not environmentally friendly.

[0005] Natural dyes based on medicinal plants have special health care effects on the human body, but there are very few reports on the use of natural dyes from medicinal plants for dyeing polyester-cotton fabrics. Chinese patent CN113638245A discloses a plant dye one-bath dyeing method for polyester-cotton blended yarn, which uses plant dye lithospermum pigment. Those skilled in the art know that the dyeing temperature of lithospermum pigment is preferably 40-60°C, and high temperature will decompose lithospermum pigment. Therefore, the dyeing temperature in the dyeing method of the patent is raised to 85°C, which does not reach the temperature of polyester molecular chain segment movement, and there is a certain irrationality. In other words, this patent is only for dyeing cotton in polyester-cotton fabrics, and the process needs to add penetrants, dispersants, and organic chemical reagents such as formic acid, which is not conducive to environmental protection. Summary of the invention

[0006] The object of the present invention is to provide a one-step dyeing method for polyester-cotton jacquard fabrics by dyeing polyester and cotton simultaneously with natural dyes, so as to solve one or more of the above-mentioned problems in the prior art.

[0007] In one aspect, the present invention provides a one-step dyeing method for a single-color or double-color polyester-cotton jacquard fabric, comprising the following steps: Plant pigment, pH value regulator and water are added into a dye vat to form a dye solution, wherein the pH value of the dye solution is 5-8, and polyester-cotton jacquard fabric is added into the dye vat for dyeing, the dyeing temperature is 100-120° C., and the heat preservation time is 60-90 minutes.

[0008] In some embodiments, the plant pigment is obtained by extracting medicinal plants, and the extraction method is selected from one of acidic de-impurity extraction, neutral extraction, alkaline extraction, ethanol extraction or auxiliary agent extraction.

[0009] In some embodiments, the plant pigment is rhubarb, the extraction method is alkaline extraction, the concentration of rhubarb is 10-30g / L, and the alkaline extraction method comprises the following steps: adding 15g / L NaOH to 10-30g / L of the medicinal plant rhubarb, boiling for 30 minutes, maintaining the liquid volume during the boiling, cooling and filtering, adding a pH regulator to the filtered filtrate, adjusting the pH value of the filtrate to 5-6 for dyeing. Wherein, the pH regulator is selected from one of hydrochloric acid, sulfuric acid or nitric acid.

[0010] In some embodiments, the plant pigment is madder pigment, the extraction method is acidic impurity removal extraction, the madder pigment concentration is 10-50g / L, and the acidic impurity removal extraction method comprises the following steps: 10-50g / L madder is added to 100mL of water, 0.1mol / L of acidic auxiliary agent is added, the clear liquid is removed after boiling, 100mL of water is added to the filter residue, and the boiling is performed for 30min, during which the liquid volume is maintained, and the filtered filtrate is filtered after cooling, and a pH value regulator is added to the filtered filtrate to adjust the pH value of the filtrate to 5-8 for dyeing. Wherein, the acidic auxiliary agent is selected from one of hydrochloric acid, sulfuric acid or nitric acid, and the pH value regulator is selected from one of sodium hydroxide or sodium carbonate. The dye liquor also includes a mordant, and the mordant is alum, and the concentration of alum is 0-4g / L.

[0011] In some embodiments, the plant pigment is curcumin, the extraction method is ethanol extraction, the curcumin concentration is 10-50g / L, and the ethanol extraction method comprises the following steps: selecting 70% ethanol or anhydrous ethanol as an extractant, adding 10-50g / L turmeric to the extractant, soaking for 18 hours and filtering, adding a pH regulator to the filtered filtrate, adjusting the pH value of the filtrate to 5-6 for dyeing. Wherein, the pH regulator is selected from one of acetic acid and citric acid, and the dye solution also includes a mordant, the mordant is alum, and the concentration of alum is 0-4g / L.

[0012] On the other hand, the present invention provides a one-step dyed single-color or double-color polyester-cotton jacquard fabric obtained by the above method.

[0013] In another aspect, the present invention provides the above method for dyeing other polyester-cotton home textiles, clothing fabrics, polyester-cotton yarns, polyester-cotton blended fibers, polyester-cotton nonwoven fabrics, and polyester-cotton ready-made garments.

[0014] Beneficial effects of the present invention: 1. The present invention adopts medicinal plant pigments to replace traditional disperse dyes for dyeing polyester and replaces reactive dyes for dyeing cotton, so as to achieve dyeing of polyester-cotton fabrics. The dyeing method is simple, and only a small amount of acid-base regulator is needed during the dyeing process, which greatly reduces the emission and energy consumption of the existing dyeing method and is green and environmentally friendly.

[0015] 2. The present invention uses only one medicinal plant, madder or turmeric, to extract pigments to dye polyester and cotton fibers in the same color through a one-step method, and produces the same color spectrum pattern on the polyester-cotton fabric according to the pattern of the polyester-cotton jacquard, which is efficient, energy-saving, and environmentally friendly.

[0016] 3. During the research, the inventor accidentally discovered that only one medicinal plant, rhubarb, can be used to extract pigments to dye polyester and cotton fibers in different colors through a one-bath one-step method, and a double color spectrum pattern is produced on the polyester-cotton fabric according to the pattern of polyester-cotton jacquard. The polyester-cotton is dyed and different colors are produced, which meets people's multiple needs for aesthetics, health and function, and caters to the consumer psychology of modern people to return to nature and maintain health. It has strong practical significance and huge market demand potential at home and abroad. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a picture of the polyester-cotton jacquard fabric after dyeing in Example 1; Figure 2 This is a picture of the polyester-cotton jacquard fabric after dyeing in Example 2; Figure 3 This is a picture of the polyester-cotton jacquard fabric after dyeing in Example 3; Figure 4 (a) The wavelength and K / S color depth of polyester fabric dyed with curcumin at different pH values; (b) The H (hue) and b value (positive value indicates yellow light) of polyester fabric dyed with curcumin at different pH values; Figure 5 (a) Wavelength and K / S color depth value of cotton fabric dyed by curcumin at different pH; (b) H (hue) and b value (positive value indicates yellow light) of cotton fabric dyed by curcumin; Figure 6 The UV-visible absorption spectrum of the stripping solution of curcumin directly dyeing polyester and cotton fabrics is shown below; Figure 7 (a) The wavelength and K / S color depth of polyester fabric dyed with madder pigment at different pH values; (b) H (hue), b value (positive value indicates yellow light), and a value (positive value indicates red light) of polyester fabric dyed with curcumin; Figure 8 (a) is the wavelength and K / S color depth value of cotton fabric dyed with madder pigment at different pH values; (b) is the H (hue), b value (positive value indicates yellow light), and a value (positive value indicates red light) of cotton fabric dyed with curcumin. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the examples. The following examples are only used to more clearly illustrate the performance of the present invention, and are not limited to the following examples.

[0019] Embodiment 1: Extraction method of rhubarb: Add 15g / L NaOH to 30g / L of the medicinal plant rhubarb, boil for 30 minutes while maintaining the liquid volume, and filter after cooling.

[0020] Adding rhodamine and pH regulator into a dye vat to form a dye solution, the concentration of rhodamine is 30 g / L, and the pH value of the dye solution is controlled at 6 by the pH regulator. Adding polyester-cotton fabric into the dye vat for dyeing, the dyeing temperature is 120° C., and the insulation time is 60 min.

[0021] Dyed polyester-cotton fabrics such as Figure 1 As shown, rhodamine is dyed on polyester and cotton to produce different colors, with polyester appearing yellow and cotton appearing khaki, meeting people's multiple needs for aesthetics, health and functionality.

[0022] Embodiment 2: Extraction method of madder pigment: add 50g / L madder to 100mL of water, add 0.1mol / L of acidic auxiliary hydrochloric acid, remove the clear liquid after boiling, add 100mL of water to the filter residue, boil for 30min, maintain the liquid volume during the period, filter after cooling, add pH adjuster sodium hydroxide to the filtrate after filtration, adjust the pH value of the filtrate to 8, add 4g / L of alum to the dye vat to form a dye solution, the dyeing temperature is 120℃, and the insulation time is 90min.

[0023] Dyed polyester-cotton fabrics such as Figure 2 As shown, madder pigment is dyed on polyester cotton and produces colors in the same red spectrum.

[0024] Embodiment 3: Extraction method of curcumin: select 50% ethanol or anhydrous ethanol as the extractant, add 20g / L turmeric to the extractant, soak for 18 hours and then filter.

[0025] A turmeric extract, a pH regulator, acetic acid, and 4 g / L alum are added to a dye vat to form a dye solution, the concentration of curcumin pigment is 20 g / L, the pH value of the dye solution is controlled at 6 by the pH regulator acetic acid, a polyester-cotton fabric is added to the dye vat for dyeing, the dyeing temperature is 120° C., and the insulation time is 60 min.

[0026] Dyed polyester-cotton fabrics such as Figure 3 As shown, curcumin dyed on polyester cotton produced the same yellow color.

[0027] In order to clearly show the effect of curcumin on the same-bath dyeing method of polyester and cotton fabrics, the following experiment was designed: Experiment 1: The steps are the same as those in Example 3, except that the polyester fabric and the cotton fabric are added to the dye vat for dyeing in the same bath, and the dyeing pH value is controlled at 5.

[0028] Experiment 2: The steps are the same as those in Example 3, except that the polyester fabric and the cotton fabric are added to the dye vat for dyeing in the same bath, and the dyeing pH value is controlled at 6.

[0029] Experiment 3: The steps are the same as those in Example 3, except that the polyester fabric and the cotton fabric are added to the dye vat for dyeing in the same bath, and the dyeing pH value is controlled at 7.

[0030] Experiment 4: The steps are the same as those in Example 3, except that the polyester fabric and the cotton fabric are added to the dye vat for dyeing in the same bath, and the dyeing pH value is controlled at 8.

[0031] Analysis of the same-bath dyeing method and effect of curcumin on polyester and cotton fabrics in experiments 1-4: Depend on Figure 4 It can be seen that curcumin has little effect on polyester fabrics at a pH of 8, and the yellow light b value of the dyed fabric is very low. This is because the hydroxyl groups in curcumin form hydroxyl anions under alkaline conditions, which reduces the affinity between the dye and the fiber, resulting in a low color yield of the fabric. When the dyeing pH value is 5-6, the maximum absorption wavelength of the dyed fabric is 420mm, and the H value of the fabric is basically stable at around 100. The K / S value is the largest when the pH is 6, and the yellow light b value is also the strongest.

[0032] Depend on Figure 5It can be seen that with the increase of dyeing pH value, the K / S value and yellow light b value of curcumin dyed cotton fabric both decrease. This is because the hydroxyl group (-OH) of curcumin is converted into negative ions (-O-), becoming an anionic dye, and the repulsion between the dye molecule and the cotton fiber increases. When the dyeing pH value is 5-6, the maximum absorption wavelength of the dyed cotton fabric is 420mm, the hue H value is 90-100, the color depth value is the highest when the pH is 5, and the yellow light b value is the largest. When the dyeing pH value is 7-8, the K / S value and yellow light b value of cotton fabric are small, and curcumin basically does not dye.

[0033] The effect of curcumin on the same-bath dyeing of polyester and cotton fabrics was analyzed. When the dyeing pH value was 5-6, the K / S value of polyester and cotton fabrics was higher and the hue H value was consistent. Considering that cotton fiber is not acid-resistant, the pH value of curcumin for the same-bath dyeing of polyester and cotton fabrics was preferably 6.

[0034] Analysis of color stripping of curcumin directly dyed polyester and cotton fabrics in Experiment 2: Depend on Figure 6 The visible absorption spectrum of the stripping solution shows that the pigment components dyed on polyester and cotton fabrics are the same substance, and its maximum absorption peak in the visible light band appears at 430nm. By comparing the absorption peak with the curcumin standard, it is determined that the pigment components dyed on polyester and cotton fabrics are both curcumin.

[0035] In order to clearly show the effect of madder pigment on the same-bath dyeing method of polyester and cotton fabrics, the following experiment was designed: Experiment 5 The steps are the same as those in Example 2, except that the polyester fabric and the cotton fabric are added to the dye vat for dyeing in the same bath, and the dyeing pH value is controlled at 5.

[0036] Experiment 6 The steps are the same as those in Example 2, except that the polyester fabric and the cotton fabric are added to the dye vat for dyeing in the same bath, and the dyeing pH value is controlled at 6.

[0037] Experiment 7 The steps are the same as those in Example 2, except that the polyester fabric and the cotton fabric are added to the dye vat for dyeing in the same bath, and the dyeing pH value is controlled at 7.

[0038] Experiment 8 The steps are the same as those in Example 2, except that the polyester fabric and the cotton fabric are added to the dyeing vat for dyeing in the same bath. The dyeing pH value is controlled at 8.

[0039] Analysis of the same-bath dyeing method and effect of madder pigment on polyester and cotton fabrics in Experiments 5-8: Depend on Figure 7 It can be seen that the use of Al3+ When dyeing with mordant, the λmax of polyester fabric is 430nm when the pH value is 5-6; and 520nm when the pH value is 7-8. As the pH value of dyeing increases, the yellow light b value of polyester fabric decreases, and the red light a value increases, and the dyed fabric changes from yellow to red. This is because the mordant potassium aluminum sulfate hydrolyzes in the dye solution to form Al 3+ It forms a complex with -OH and other groups in cotton fibers, turning the fabric red.

[0040] Depend on Figure 8 It can be seen that the use of Al 3+ The color change of cotton fabric is basically the same as that of polyester fabric when dyed with the same mordant. When the pH value is 5 and 7, the hue of polyester and cotton fabrics is consistent, and the dyed fabrics are yellow and red respectively. When the pH value of dyeing is 5, the color depth of polyester fabric is greater than that of cotton fabric. When the pH value is 7, the color depth of polyester and cotton fabrics is not much different.

[0041] Based on the analysis of the dyeing effect of madder pigment on polyester and cotton fabrics in the same bath, alum was selected as the mordant, the dyeing pH 5 and pH 6 was yellow, and the dyeing pH 7 and 8 was red.

[0042] In summary: 1. The present invention adopts medicinal plant pigments to replace disperse dyes and reactive dyes at the same time, so as to achieve simultaneous one-step dyeing of polyester and cotton in polyester-cotton fabrics. The dyeing method is simple, and only a small amount of acid-base regulator is needed during the dyeing process, which greatly reduces the emission and energy consumption of the existing dyeing method and is green and environmentally friendly.

[0043] 2. The present invention uses only one medicinal plant, madder or turmeric, to extract pigments to dye polyester and cotton fibers with the same color through a one-bath one-step method, and produces the same color spectrum pattern on the polyester-cotton jacquard fabric according to the pattern of the polyester-cotton jacquard, which is efficient, energy-saving, and environmentally friendly.

[0044] 3. During the research, the inventor accidentally discovered that only one medicinal plant, rhubarb, can be used to extract pigments to dye two fibers in polyester-cotton fabrics in a one-bath one-step process, presenting different colors. A dual-color spectrum pattern is produced on polyester-cotton jacquard fabrics according to the pattern of polyester-cotton jacquard. Both polyester and cotton can be dyed and produce different colors, meeting people's multiple needs for aesthetics, health and function, and catering to the consumer psychology of modern people to return to nature and maintain health. It has strong practical significance and huge market demand potential at home and abroad.

[0045] The above description is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the present invention, and these should also be regarded as within the scope of protection of the present invention.

Claims

1. A one-step dyeing method for a single-color or double-color polyester-cotton jacquard fabric, characterized in that: The following steps are involved: Plant pigment, pH value regulator and water are added into a dye vat to form a dye solution, wherein the pH value of the dye solution is 5-8, and a polyester-cotton jacquard fabric is added into the dye vat for dyeing, the dyeing temperature is 120° C., and the heat preservation time is 60-90 minutes. The plant pigment is one of rhubarb, madder pigment or curcumin.

2. The method according to claim 1, characterized in that The plant pigment is obtained by extracting medicinal plants, and the extraction method is selected from one of acidic impurity removal extraction, neutral extraction, alkaline extraction, ethanol extraction or auxiliary agent extraction.

3. The method according to claim 2, characterized in that The plant pigment is rhubarb, the extraction method is alkaline extraction, the concentration of rhubarb is 10-30g / L, and the alkaline extraction method comprises the following steps: adding NaOH with a concentration of 15g / L to 10-30g / L of the medicinal plant rhubarb, boiling for 30 minutes, maintaining the liquid volume during the boiling, filtering after cooling, adding a pH regulator to the filtered filtrate, adjusting the pH value of the filtrate to 5-6 for dyeing.

4. The method according to claim 3, characterized in that The pH adjuster is selected from hydrochloric acid, sulfuric acid or nitric acid.

5. The method according to claim 2, characterized in that: The plant pigment is madder pigment, the extraction method is acidic impurity removal extraction, the madder pigment concentration is 10-50g / L, and the acidic impurity removal extraction method comprises the following steps: adding 10-50g / L madder pigment to 100mL of water, adding 0.1mol / L of acid auxiliary agent, removing the clear liquid after boiling, adding 100mL of water to the filter residue, boiling for 30min, maintaining the liquid volume during the boiling, filtering after cooling, adding a pH regulator to the filtered filtrate, adjusting the pH value of the filtrate to 5-8 for dyeing.

6. The method according to claim 5, characterized in that The acidic auxiliary agent is selected from one of hydrochloric acid, sulfuric acid or nitric acid, and the pH value adjuster is selected from one of sodium hydroxide or sodium carbonate.

7. The method according to claim 2, characterized in that The plant pigment is curcumin, the extraction method is ethanol extraction, the concentration of curcumin is 10-50g / L, and the ethanol extraction method comprises the following steps: selecting 70% ethanol or anhydrous ethanol as an extractant, adding 10-50g / L turmeric to the extractant, soaking for 18 hours and then filtering, adding a pH regulator to the filtered filtrate, adjusting the pH value of the filtrate to 5-6 for dyeing.

8. The method according to claim 7, characterized in that The pH adjuster is selected from acetic acid or citric acid.

9. The method according to claim 5 or 7, characterized in that: The dye solution also includes a mordant, which is alum, and the concentration of the alum is 0-4g / L.

10. Single-chromatography or double-chromatography polyester-cotton jacquard fabric dyed in one step obtained by the method described in any one of claims 1 to 9.

11. The method according to any one of claims 1 to 9 is used for dyeing other polyester-cotton home textiles, clothing fabrics, polyester-cotton yarns, polyester-cotton blended fibers, polyester-cotton nonwoven fabrics, and polyester-cotton ready-made garments.

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