Spinning and continuous dyeing and finishing process of color master batch fabric

Abstract

The invention relates to the field of spinning, and particularly discloses a spinning and continuous dyeing and finishing process of a color master batch fabric. A spinning and continuous dyeing and finishing process of a color master batch fabric comprises the following specific steps: preparing color master batches: mixing dimethyl terephthalate, propylene glycol, a pigment, an anti-ultraviolet-oxidant, a coupling agent and a catalyst, uniformly stirring, vacuumizing, and heating for reaction to obtain the color master batches; the color master batch and polyester chips are mixed to form a spinning mixture, heating melt spinning is conducted, titanium dioxide particles are added in the spinning process, then air blowing cooling shaping and oiling bundling are conducted in sequence, the concentration of an oiling agent is 10%-13%, the oil content is 0.4%-0.75%, colored textile fibers are formed through drafting false twisting and winding, and the colored fabric is formed after spinning; according to the method, spinning and dyeing of the fibers are completed synchronously, the production process is shortened, and meanwhile the prepared colored fabric has good color fastness.

Description

Technical Field

[0001] This application relates to the textile field, and in particular to a textile and continuous dyeing and finishing process for masterbatch fabrics. Background Technology

[0002] Existing polyester-cotton blends or polyester-viscose blends often exhibit poor colorfastness when dyeing dark colors such as black, bright red, and dark blue, failing to meet customer requirements. Dyeing and printing factories typically employ methods such as enhanced dyeing and washing, adding color-fixing agents during finishing, and using a two-bath dyeing process to improve the various colorfastness indicators for dark colors.

[0003] However, traditional dyeing methods typically require high temperature and pressure or the presence of a carrier, which also reduces the wash fastness of the dyed fabric, makes it prone to fading, and results in a narrow color chromatogram. Furthermore, these dyeing processes require reduction washing water, rinsing water, and soaping water during dye dispersion on the fabric, significantly increasing water consumption and wastewater discharge, thus severely polluting the environment. Summary of the Invention

[0004] To improve the dyeing effect of fabrics, this application provides a spinning process for masterbatch fabrics and a continuous dyeing and finishing process for masterbatch fabrics provided in this application, adopting the following technical solutions: A textile and continuous dyeing and finishing process for masterbatch fabrics includes the following specific steps: Preparation of color masterbatch: Dimethyl terephthalate, propylene glycol, pigment, UV-antioxidant, coupling agent and catalyst are mixed, stirred evenly, vacuumed and heated to react, and color masterbatch is obtained. Spinning: The masterbatch is mixed with polyester chips to form a spinning mixture, which is heated and melted for spinning. Titanium dioxide particles are added during the spinning process. Then, the mixture is cooled and shaped by blowing, and oiled and bundled. The oil concentration is 10-13% and the oil content is 0.4-0.75%. After stretching, false twisting and winding, colored textile fibers are formed. After spinning, colored fabrics are formed.

[0005] By adopting the above technical solution, this application heats and melts the masterbatch and polyester chips before polymer heating and spinning, simultaneously completing the spinning and dyeing of polymer fibers. This simplifies the production process, reduces the need for dye dispersion and reduction cleaning processes, reduces wastewater discharge during dyeing and printing, and saves energy and reduces consumption. Simultaneously, the heated and melted masterbatch can be better dispersed in the polyester system, promoting better pigment dispersion and stronger color fastness in textiles, resulting in uniform and consistent colors and improving the dyeing effect of the fabric. During the spinning process of colored textile fibers, adjusting the oil concentration within a suitable range can increase bundle cohesion, improve the flexibility of individual fibers and the cohesion between fiber bundles, and reduce fiber breakage and fuzzing during the spinning process.

[0006] The polymer formed by the polycondensation reaction of dimethyl terephthalate and propylene glycol serves as a pigment carrier and exhibits good compatibility with polyester chips in the subsequent process. At the same time, the coupling agent can promote the firm bonding of the components in the spinning mixture in the molten state, thereby improving the color fastness and uniformity of the fabric.

[0007] Preferably, the air temperature during the blowing cooling and shaping process is 18-20℃, and the air humidity is 70-80%.

[0008] By adopting the above technical solution and controlling the blowing cooling and shaping conditions within a suitable range, it is possible to promote the cooling of the composite melt into fine streams, fix the solidification point of the fine strips, and ensure the uniformity of the nascent filaments, thereby promoting the uniform color of the prepared colored textile fibers.

[0009] Preferably, the masterbatch comprises the following raw materials in parts by weight: 60-80 parts dimethyl terephthalate, 20-40 parts propylene glycol, 30-50 parts pigment, 5-10 parts UV oxidant, 5-8 parts coupling agent, and 1-3 parts catalyst.

[0010] Preferably, the color masterbatch has a size of 100-200 nm.

[0011] By adopting the above technical solution, nanoscale color masterbatch has high dispersibility and can be uniformly dispersed in the fiber system, which promotes uniform coloring of the fiber and reduces the generation of color spots and color differences.

[0012] Preferably, the UV-oxidant is a mixture of 2,4-dihydroxybenzophenone, tea polyphenols, and antioxidants.

[0013] By adopting the above technical solution, 2,4-dihydroxybenzophenone is a UV absorber that can absorb ultraviolet rays and convert them into harmless heat energy, effectively preventing UV damage to fibers and extending the color fastness of fabrics. Tea polyphenols and antioxidants can scavenge free radicals, prevent oxidative degradation of fabric colors, maintain fiber color and strength, and improve fabric durability.

[0014] Preferably, the pigment undergoes a pre-treatment of self-dispersion, including the following specific steps: Pigment, water, and surfactant are mixed and ultrasonically dispersed to form a pigment dispersion. The pigment dispersion is then ground using zirconium balls as a medium to obtain a pigment paste. The pigment paste is then spray-dried to obtain a self-dispersible pigment.

[0015] By adopting the above technical solution, the pigment is pre-dispersed, which can promote the pigment to be evenly dispersed in the masterbatch system, thereby enabling uniform coloring on the fiber surface and improving the color fastness and color uniformity of the colored fiber.

[0016] Preferably, the surfactant is sodium lignosulfonate.

[0017] Preferably, the titanium dioxide particles are pre-coated with chitosan, including the following specific steps: Chitosan was dissolved to obtain a chitosan solution. The chitosan solution was then added dropwise to a sodium tripolyphosphate solution and stirred until homogeneous to obtain a chitosan dispersion. A titanium dioxide solution was then added dropwise to the chitosan dispersion and stirred until homogeneous. The mixture was then centrifuged and freeze-dried to obtain a chitosan-coated titanium dioxide composite.

[0018] By adopting the above technical solution, chitosan exhibits good compatibility with the polyester polymer matrix. Chitosan-coated titanium dioxide improves compatibility with polyester chips, thereby promoting uniform dispersion of titanium dioxide in the colored fiber system. This results in more uniform UV resistance in the colored fabric, reducing oxidative fading and improving color fastness and UV resistance. Simultaneously, under UV irradiation, the bioactivity of chitosan and the photocatalytic activity of titanium dioxide synergistically enhance the self-cleaning and antibacterial properties of the fabric.

[0019] In summary, this application has the following beneficial effects: 1. Because this application combines the masterbatch with polyester chips before polymer melting and spinning, the spinning and dyeing of polymer fibers are completed simultaneously, simplifying the production process, reducing wastewater discharge during printing and dyeing, and saving energy and reducing consumption. In the masterbatch raw material, dimethyl terephthalate reacts with propylene glycol to form a polymer that serves as a pigment carrier. This polymer exhibits good compatibility with polyester chips in subsequent processes, improving the color fastness and uniformity of the fabric.

[0020] 2. In this application, the pigment is pre-dispersed, which promotes uniform pigment coloring on the fiber surface, improving the color fastness and color uniformity of the colored fibers. Pre-coating titanium dioxide with chitosan before adding it to the spinning process promotes better compatibility between titanium dioxide and the polyester polymer, resulting in more uniform UV resistance in the colored fabric, reducing oxidation and fading, and improving the color fastness and UV resistance of the colored fabric. Detailed Implementation

[0021] The present application will be further described in detail below with reference to the following examples and embodiments.

[0022] All raw materials used in the examples are commercially available. Example

[0023] Example 1 This embodiment provides a textile and continuous dyeing and finishing process for masterbatch fabrics, including the following specific steps: Preparation of color masterbatch S1: Mix 70 kg of dimethyl terephthalate, 25 kg of propylene glycol, 40 kg of pigment, 8 kg of UV-oxidant, 7 kg of coupling agent, and 2 kg of catalyst. After stirring evenly, evacuate to 70 Pa, heat to 165 °C and react for 3 h, then continue heating to 280 °C and react for 4 h. Melt and extrude, then granulate to obtain color masterbatch with a particle size of 100-200 nm. The UV-oxidant is a mixture of antioxidant 1010 and 2,4-dihydroxybenzophenone, with a mass ratio of antioxidant 1010 to 2,4-dihydroxybenzophenone of 1:1. The catalyst is antimony trioxide, the coupling agent is KH-560, and the pigment is phthalocyanine green.

[0024] S2 spinning: The masterbatch and polyester chips are mixed at a ratio of 1:10 to form a spinning mixture. The mixture is heated and melt-spun at 250°C. Titanium dioxide particles with an average particle size of 10μm are added during the spinning process. Then, the mixture is cooled and set by blowing air at 20°C and the air humidity is 75%. Then, the mixture is oiled and bundled with an oil concentration of 12% and an oil content of 0.6%. After stretching, false twisting and winding, the colored textile fibers are formed. After spinning, the colored fabric is formed.

[0025] Example 2 The difference between Example 2 and Example 1 is that the textile and continuous dyeing and finishing process of the masterbatch fabric includes the following specific steps: S1 Preparation of masterbatch: 60 kg of dimethyl terephthalate, 20 kg of propylene glycol, 30 kg of pigment, 5 kg of UV-oxidant, 5 kg of coupling agent, and 1 kg of catalyst are mixed, stirred evenly, and then vacuumed to 70 Pa. The mixture is heated to 165 °C for 3 h, and then heated to 280 °C for 4 h. The mixture is then melt-extruded and granulated to obtain masterbatch with a particle size of 100-200 nm. The UV-oxidant is a mixture of antioxidant 1010 and 2,4-dihydroxybenzophenone, with a mass ratio of antioxidant 1010 to 2,4-dihydroxybenzophenone of 1:1. The catalyst is antimony trioxide, the coupling agent is KH-560, and the pigment is phthalocyanine green.

[0026] S2 spinning: The masterbatch and polyester chips are mixed at a ratio of 1:10 to form a spinning mixture. The mixture is heated and melt-spun at 250°C. Titanium dioxide particles with an average particle size of 10μm are added during the spinning process. Then, the mixture is cooled and set by blowing air at 20°C and the air humidity is 75%. Then, the mixture is oiled and bundled with an oil concentration of 12% and an oil content of 0.6%. After stretching, false twisting and winding, the colored textile fibers are formed. After spinning, the colored fabric is formed.

[0027] Example 3 The difference between Example 3 and Example 1 is that in the spinning and continuous dyeing and finishing process of the masterbatch fabric, the amount of dimethyl terephthalate used in the masterbatch raw materials is 80 kg, the amount of propylene glycol is 40 kg, the amount of pigment is 50 kg, the amount of anti-UV oxidant is 10 kg, the amount of coupling agent is 8 kg, and the amount of catalyst is 3 kg.

[0028] Example 4 The difference between Example 4 and Example 1 is that the UV-oxidant in the masterbatch raw material of the masterbatch fabric in the textile and continuous dyeing and finishing process is a mixture of 2,4-dihydroxybenzophenone, tea polyphenols and antioxidant, and the mass ratio of 2,4-dihydroxybenzophenone, tea polyphenols and antioxidant is 1:1:1.

[0029] Example 5 The difference between Example 5 and Example 4 is that the pigments in the masterbatch raw materials are pre-treated for self-dispersion in the textile and continuous dyeing and finishing process of the masterbatch fabric.

[0030] The textile and continuous dyeing and finishing process of masterbatch fabrics includes the following specific steps: S1 Pigment Self-Dispersion Treatment: Pigment, water, and surfactant are mixed in a mass ratio of 1:1:0.2. The surfactant is sodium lignosulfonate. The mixture is ultrasonically dispersed for 30 minutes to form a pigment dispersion. The pigment dispersion is then ground using zirconium balls as a medium for 3 hours to obtain a pigment paste. The pigment paste is then spray-dried to obtain a self-dispersible pigment.

[0031] S2 Preparation of Masterbatch: 70 kg of dimethyl terephthalate, 25 kg of propylene glycol, 40 kg of self-dispersible pigment, 8 kg of UV-oxidant, 7 kg of coupling agent, and 2 kg of catalyst are mixed and stirred evenly. The mixture is then evacuated to 70 Pa, heated to 165 °C for 3 h, and then heated to 280 °C for 4 h. The mixture is then melt-extruded and granulated to obtain masterbatch with a particle size of 100-200 nm. The UV-oxidant is a mixture of antioxidant 1010 and 2,4-dihydroxybenzophenone, with a mass ratio of 1:1. The catalyst is antimony trioxide, the coupling agent is KH-560, and the pigment is phthalocyanine green.

[0032] S3 spinning: The masterbatch and polyester chips are mixed at a ratio of 1:10 to form a spinning mixture. The mixture is heated and melt-spun at 250°C. Titanium dioxide particles with an average particle size of 10μm are added during the spinning process. Then, the mixture is cooled and set by blowing air at 20°C and the air humidity is 75%. Then, the mixture is oiled and bundled with an oil concentration of 12% and an oil content of 0.6%. Finally, the mixture is drawn, false-twist, and wound to form colored textile fibers. After spinning, colored fabrics are formed.

[0033] Example 6 Example 6 provides a textile and continuous dyeing and finishing process for masterbatch fabrics, including the following specific steps: S1 Pigment Self-Dispersion Treatment: Pigment, water, and surfactant are mixed in a mass ratio of 1:1:0.2. The surfactant is sodium lignosulfonate. The mixture is ultrasonically dispersed for 30 minutes to form a pigment dispersion. The pigment dispersion is then ground using zirconium balls as a medium for 3 hours to obtain a pigment paste. The pigment paste is then spray-dried to obtain a self-dispersible pigment.

[0034] S2 Preparation of Masterbatch: 70 kg of dimethyl terephthalate, 25 kg of propylene glycol, 40 kg of self-dispersible pigment, 8 kg of UV-oxidant, 7 kg of coupling agent, and 2 kg of catalyst are mixed and stirred evenly. The mixture is then evacuated to 70 Pa, heated to 165 °C for 3 h, and then heated to 280 °C for 4 h. The mixture is then melt-extruded and granulated to obtain masterbatch with a particle size of 100-200 nm. The UV-oxidant is a mixture of antioxidant 1010 and 2,4-dihydroxybenzophenone, with a mass ratio of 1:1. The catalyst is antimony trioxide, the coupling agent is KH-560, and the pigment is phthalocyanine green.

[0035] S3: Chitosan was dissolved in acetic acid to obtain a chitosan solution with a concentration of 1 mg / mL. The chitosan solution was then added dropwise to a 1 mg / L sodium tripolyphosphate aqueous solution at a mass ratio of 1:1. The mixture was stirred until homogeneous to obtain a chitosan dispersion. Titanium dioxide was uniformly dispersed in ethanol at a mass ratio of 1:1 to form a titanium dioxide solution. The titanium dioxide solution was then uniformly added dropwise to the chitosan dispersion. The mixture was stirred at room temperature for 6 hours, centrifuged, and freeze-dried to obtain a chitosan-coated titanium dioxide complex.

[0036] S4 spinning: The masterbatch and polyester chips are mixed at a ratio of 1:10 to form a spinning mixture. The mixture is then melt-spun at 250°C. During the spinning process, a chitosan-coated titanium dioxide composite is added. The average particle size of the chitosan-coated titanium dioxide composite particles is 10μm. The mixture is then cooled and set by blowing air at 20°C and maintaining a humidity of 75%. After that, it is oiled and bundled with an oil concentration of 12% and an oil content of 0.6%. The mixture is then drawn, false-twist, and wound to form colored textile fibers. After spinning, a colored fabric is formed.

[0037] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that titanium dioxide particles are not used in the spinning and continuous dyeing and finishing process of the masterbatch fabric.

[0038] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the spinning and continuous dyeing and finishing process of the masterbatch fabric does not use an anti-UV oxidant.

[0039] The performance testing was conducted on the colored fabrics obtained by the spinning and continuous dyeing and finishing processes of the masterbatch fabrics provided in Examples 1-6 and Comparative Examples 1-2 of this application. The specific test results are shown in Table 1.

[0040] Detection methods I. Colorfastness The color fastness to rubbing of the colored fabrics prepared in this application was tested according to GB / T 3920-2008 "Textiles - Tests for color fastness to rubbing". The color fastness to washing of the colored fabrics prepared in this application was tested according to GB / T 3921-2008 "Textiles - Tests for color fastness to rubbing".

[0041] II. Lightfastness The light fastness of the colored fabrics prepared in this application was tested in accordance with the standard GB / T8427—2019 "Textiles - Tests for color fastness to artificial light: Xenon arc".

[0042] Table 1: Performance Test Results Data Table The performance test results show that the colored fabric prepared in this application has good color fastness, reduces fabric fading, and simultaneously completes the spinning and dyeing of polymer fibers, shortening the production process, reducing wastewater discharge during the dyeing process, and saving energy and reducing consumption. As shown in Examples 5-6, Example 5 involves self-dispersing the pigment, and Example 6 uses chitosan to coat titanium dioxide, resulting in significantly improved surface color uniformity and color durability of the woven colored fabric.

[0043] A comparison of Comparative Examples 1-2 and Example 1 shows that Comparative Example 1 does not use titanium dioxide particles, and Comparative Example 2 does not use an anti-UV oxidant. The performance test results show that the color fastness of the materials is reduced. This further illustrates that although the dyeing effect of the fabric surface color is not affected when a single color masterbatch is combined with polyester chips to form a colored fabric, the durability of the fabric color is limited and it is prone to fading.

[0044] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A textile and continuous dyeing and finishing process for masterbatch fabrics, characterized in that, The specific steps include the following: Preparation of color masterbatch: Dimethyl terephthalate, propylene glycol, pigment, UV-resistant oxidant, coupling agent and catalyst are mixed, stirred evenly, vacuumed and heated to react, and color masterbatch is obtained. Spinning: The masterbatch is mixed with polyester chips to form a spinning mixture, which is heated and melted for spinning. Titanium dioxide particles are added during the spinning process. Then, the mixture is cooled and shaped by blowing, and oiled and bundled. The oil concentration is 10-13% and the oil content is 0.4-0.75%. After being drawn, false twisted and wound, colored textile fibers are formed. After spinning, colored fabrics are formed.

2. The spinning and continuous dyeing and finishing process for masterbatch fabrics according to claim 1, characterized in that, The air temperature during the blowing cooling and shaping process is 18-20℃, and the air humidity is 70-80%.

3. The textile and continuous dyeing and finishing process for masterbatch fabrics according to claim 1, characterized in that, The masterbatch comprises the following raw materials in parts by weight: 60-80 parts dimethyl terephthalate, 20-40 parts propylene glycol, 30-50 parts pigment, 5-10 parts UV oxidant, 5-8 parts coupling agent, and 1-3 parts catalyst.

4. The spinning and continuous dyeing and finishing process for masterbatch fabrics according to claim 3, characterized in that, The color masterbatch has a size of 100-200 nm.

5. The spinning and continuous dyeing and finishing process for masterbatch fabrics according to claim 3, characterized in that, The UV-oxidant is a mixture of 2,4-dihydroxybenzophenone, tea polyphenols, and antioxidants.

6. The textile and continuous dyeing and finishing process for masterbatch fabrics according to claim 3, characterized in that, The pigment is pre-treated for self-dispersion, including the following specific steps: Pigment, water, and surfactant are mixed and ultrasonically dispersed to form a pigment dispersion. The pigment dispersion is then ground using zirconium balls as a medium to obtain a pigment paste. The pigment paste is then spray-dried to obtain a self-dispersible pigment.

7. The textile and continuous dyeing and finishing process for masterbatch fabrics according to claim 6, characterized in that, The surfactant is sodium lignosulfonate.

8. The textile and continuous dyeing and finishing process for masterbatch fabrics according to claim 6, characterized in that, The titanium dioxide particles are pre-coated with chitosan, including the following specific steps: Chitosan was dissolved to obtain a chitosan solution. The chitosan solution was then added dropwise to a sodium tripolyphosphate solution and stirred until homogeneous to obtain a chitosan dispersion. A titanium dioxide solution was then added dropwise to the chitosan dispersion and stirred until homogeneous. The mixture was then centrifuged and freeze-dried to obtain a chitosan-coated titanium dioxide composite.

9. The textile and continuous dyeing and finishing process for masterbatch fabrics according to claim 8, characterized in that, The mass ratio of chitosan to titanium dioxide is 1:(1.5-2).

Images