Environment-friendly satin cloth added with regenerated polyester fibers and preparation method of environment-friendly satin cloth

Abstract

The invention belongs to the technical field of environment-friendly satin cloth and discloses environment-friendly satin cloth added with regenerated polyester fibers and a preparation method of the environment-friendly satin cloth added with the regenerated polyester fibers, and the environment-friendly satin cloth added with the regenerated polyester fibers comprises the following fiber components in percentage by mass: 40-50% of regenerated polyester fibers (rPET); 25%-35% of bio-based degradable polyester fiber, which is selected from polylactic acid (PLA) or poly (butylene adipate-co-terephthalate) (PBAT); and 15%-25% of bio-based synthetic polyester fibers, wherein the bio-based synthetic polyester fibers are selected from bio-based polytrimethylene terephthalate (PTT) or polyethylene furanoate (PEF). By accelerating diffusion and action of extracellular enzyme secreted by the natural fiber on the surface of the degradable component, more importantly, a physical supporting environment is provided for the degradable polyester due to the complete biodegradation characteristic of the natural fiber, so that the degradable polyester cannot form a durable micro-plastic barrier in the disintegration process; due to the synergistic effect, the fabric gradually loses integrity in a buried or marine environment and finally returns to a natural carbon cycle system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of environmentally friendly color denim, specifically to environmentally friendly color denim added with regenerated polyester fiber and a preparation method thereof. BACKGROUND

[0002] Environmentally friendly color denim is a high-quality fabric produced with environmentally friendly materials, featuring bright colors and smoothness. Its main raw material is degradable polyester fiber (such as recycled polyester or other sustainable materials), processed through advanced textile technology and dyeing process. Compared with traditional color denim, environmentally friendly color denim greatly reduces environmental pollution during production, uses more environmentally friendly dyes, and meets international environmental protection standards in terms of wastewater and exhaust gas emissions during production.

[0003] The essential problem of environmentally friendly color denim made from recycled or virgin polyester fiber (PET) is that PET material itself cannot be effectively decomposed by microorganisms in nature. This non-biodegradability leads to the persistence of waste fabric in the environment (such as oceans, soil, landfills) for hundreds of years, and inevitably releases microplastic pollution to the environment during production and consumption.

[0004] The core raw material of environmentally friendly color denim, polyester fiber (PET), whether virgin or recycled (rPET), its core monomers for chemical synthesis, terephthalic acid and ethylene glycol, are highly dependent on non-renewable fossil fuel resources (oil, natural gas) for their source. Using recycled PET mainly reduces the demand for newly mined oil, but does not eliminate the dependence on the entire fossil resource system, and still needs improvement. SUMMARY

[0005] The purpose of the present application is to provide environmentally friendly color denim added with regenerated polyester fiber and a preparation method thereof to solve the problems raised in the background art.

[0006] To achieve the above purpose, the present application provides the following technical solution: environmentally friendly color denim added with regenerated polyester fiber, comprising the following fiber components by mass percentage:

[0007] 40% to 50% of regenerated polyester fiber (rPET);

[0008] 25% to 35% of biobased degradable polyester fiber, selected from polylactic acid (PLA) or polybutylene adipate terephthalate (PBAT);

[0009] 15% to 25% of biobased synthetic polyester fiber, selected from biobased polytrimethylene terephthalate (PTT) or polyethylene furanoate (PEF);

[0010] 5% to 10% of liquid coloring natural plant fiber, selected from modified hemp fiber or lyocell fiber.

[0011] As a further technical solution of the present application, the total proportion of the biobased degradable polyester fiber and the biobased synthetic polyester fiber is ≥40%, and the mass ratio of the two is 1:0.5-1:1.

[0012] As a further technical solution of the present application, the size of the stock solution colored natural plant fiber is 1.2-1.8 dtex, the length is 34-38 mm, and the color fastness is ≥4 levels.

[0013] As a further technical solution of the present application, the renewable carbon content of the fabric is ≥50%, wherein:

[0014] The renewable carbon content of the biobased degradable polyester fiber is ≥90%;

[0015] The renewable carbon content of the biobased synthetic polyester fiber is ≥35%;

[0016] The renewable carbon content of the stock solution colored natural plant fiber is 100%.

[0017] The preparation method of the environment-friendly colored denim added with recycled polyester fiber comprises the following steps:

[0018] Step (1): fiber pretreatment: the stock solution colored natural plant fiber is soaked in a water-based silicon-based softener at 45-55°C for 30 minutes, and dried to a water content of ≤3%;

[0019] Step (2): mixing and opening: the rPET fiber, the biobased degradable polyester fiber, the biobased synthetic polyester fiber and the pretreated natural fiber are put into a cleaner according to the proportion, and are opened and mixed at 800-1000 r / min, and the environmental humidity is controlled at 60%-65%;

[0020] Step (3): low-temperature spinning: after three drawing, the siro compact spinning process is used in the spinning process, the spindle speed is 9500-10500 r / min, the workshop temperature is 25-28°C, and the 60-80 English denier blended yarn is prepared;

[0021] Step (4): weaving and setting: weaving on an air jet loom at 480-550 revolutions / minute, on-machine tension 2800-3200 N, and post-heat air setting machine treatment at 170-185°C, and the speed is 18-22 m / min.

[0022] As a further technical solution of the present application, the length dispersion of the fiber in the opening and mixing process in step (2) is controlled at ≤12%, and the mixing uniformity CV value is ≤2.5%.

[0023] As a further technical solution of the present application, the twist factor of the siro compact spinning process in step (3) is 360-380, and the yarn hairiness index H value is ≤3.5.

[0024] As a further technical solution of the present application, the hot air setting machine in step (4) adopts segmented temperature control:

[0025] The front section (entry zone): 170-175 DEG C, stay for 40-45 seconds;

[0026] The middle section (stable zone): 180-185 DEG C, stay for 35-40 seconds;

[0027] The rear section (exit zone): 165-170 DEG C, stay for 20-25 seconds.

[0028] As a further technical solution of the present application, the water-based silicone softener in step (1) contains by weight: amino silicone oil emulsion 15-20 parts, aloe extract 3-5 parts, pH adjuster 0.5 parts, and the balance is deionized water.

[0029] The beneficial effects of the present application are as follows:

[0030] (1) The present application introduces biobased degradable polyester, which constructs a chemical bonding structure that can be recognized by the environment in the material system. The alpha-ester bond of PLA is hydrolyzed and broken under the action of lipase secreted by soil microorganisms. The aliphatic chain segment of PBAT gives it flexibility and biocompatibility. When these components are combined with natural plant fibers, the cellulose microporous structure of natural fibers becomes a habitat for microorganisms, accelerating the diffusion and action of extracellular enzymes secreted by microorganisms on the surface of degradable components. More importantly, the complete biodegradation characteristics of natural fibers provide a physical support environment for degradable polyester, so that it does not form a persistent microplastic barrier during the disintegration process. This synergistic effect gradually loses the integrity of the fabric in the landfill or marine environment, and ultimately returns to the carbon cycle system of nature.

[0031] (2) The present application selects biobased synthetic polyester, and the fundamental innovation lies in the biological transformation of raw material sources. One of the monomers of PTT, propylene glycol, can be obtained by fermentation of corn glucose, and furan dicarboxylic acid of PEF is derived from plant fructose dehydration reaction. This change makes part of the fiber no longer consume geological carbon resources, but rely on the current atmospheric carbon captured by photosynthesis. When biobased polyester is combined with natural plant fibers, the renewable carbon proportion exceeds 50% of the overall material, meaning that the main material source of the fabric has been separated from the petroleum refining industry chain. Especially importantly, natural fibers do not require a chemical dyeing process, and the natural pigment or stock solution coloring process eliminates the use of petroleum-based dyes, forming a double de-petroleumization path from the raw material end to the processing end.

[0032] (3) The present application forms a double inhibition on the two aspects of physical wear leading to fiber breakage and shedding, and chemical stability causing the persistence of debris. First, the original solution colored natural fiber enhances the inter-fiber bonding force through the surface nanoscale fibril structure, reduces the single fiber slip phenomenon during mechanical friction, and the high resilience of the bio-based synthetic polyester can absorb external stress to avoid brittle fracture. Second, the unique value of the biodegradable component is its environmental responsiveness. When the accidental release of small polyester debris enters water or soil, the ester bond retained in the molecular chain is easy to hydrolyze under acid and alkali conditions, so that the debris with a particle size greater than 100 pm is degraded into organic acids that can be taken up by organisms within a few months, fundamentally avoiding its bioaccumulation in the food chain. This preventive design changes the one-way pollution characteristics of traditional polyester materials and turns the linear waste process into a controllable metabolic process. BRIEF DESCRIPTION OF DRAWINGS

[0033] Fig. 1 The figure is a schematic diagram of the proportion of the fiber composition of the present application;

[0034] Fig. 2 The figure is a schematic diagram of the proportion of the renewable carbon content of the present application;

[0035] Fig. 3 The figure is a schematic diagram of the preparation process of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] As shown in the figure, in the embodiment of the present application, the environment-friendly oxford fabric added with recycled polyester fiber contains the following fiber components in percentage by mass: Figs. 1 to 3

[0038] 40% to 50% recycled polyester fiber (rPET);

[0039] 25% to 35% biobased degradable polyester fiber, selected from polylactic acid (PLA) or polybutylene adipate terephthalate (PBAT);

[0040] 15% to 25% biobased synthetic polyester fiber, selected from biobased polytrimethylene terephthalate (PTT) or polyethylene furanoate (PEF);

[0041] 5% to 10% original solution colored natural plant fiber, selected from modified hemp fiber or lyocell fiber.

[0042] ​The total proportion of bio-based degradable polyester fiber and bio-based synthetic polyester fiber is ≥40%, and the mass ratio of the two is 1:0.5-1:1.

[0043] The size of the stock solution colored natural plant fiber is 1.2-1.8 dtex, the length is 34-38 mm, and the color fastness is ≥4 levels.

[0044] The renewable carbon content of the fabric is ≥50%, wherein:

[0045] The renewable carbon content of the bio-based degradable polyester fiber is ≥90%;

[0046] The renewable carbon content of the bio-based synthetic polyester fiber is ≥35%;

[0047] The renewable carbon content of the stock solution colored natural plant fiber is 100%.

[0048] The preparation method of the environment-friendly colored denim added with recycled polyester fiber comprises the following steps:

[0049] Step 1: Fiber pretreatment: the stock solution colored natural plant fiber is soaked in a water-based silicon-based softener at 45-55°C for 30 minutes, and dried to a water content of ≤3%;

[0050] Step 2: mixing and opening: the rPET fiber, bio-based degradable polyester fiber, bio-based synthetic polyester fiber and pretreated natural fiber are put into a cleaner according to the proportion, and are opened and mixed at 800-1000 r / min, and the environmental humidity is controlled at 60%-65%;

[0051] Step 3: low-temperature spinning: after three drawing, the Siro compact spinning process is used in the spinning process, the spindle speed is 9500-10500 r / min, the workshop temperature is 25-28°C, and the 60-80 English denier blended yarn is prepared;

[0052] Step 4: weaving and setting: weaving on an air jet loom at 480-550 revolutions per minute, on-machine tension 2800-3200 N, and post-heat air setting machine treatment at 170-185°C, speed 18-22 m / min.

[0053] In step 2, the length dispersion of the opening and mixing process is controlled at ≤12%, and the mixing uniformity CV value is ≤2.5%.

[0054] In step 3, the twist factor of the Siro compact spinning process is 360-380, and the yarn hairiness index H value is ≤3.5.

[0055] In step 4, the hot air setting machine uses segmented temperature control:

[0056] Front section (entry area): 170-175°C, stay for 40-45 seconds;

[0057] Middle section (stabilization zone): 180-185°C, residence time 35-40 seconds;

[0058] End section (exit zone): 165-170°C, residence time 20-25 seconds.

[0059] In step 1, the aqueous silicon-based softener contains, by weight: 15-20 parts of amino silicone oil emulsion, 3-5 parts of aloe extract, 0.5 parts of pH adjuster, and the balance is deionized water.

[0060] Through the synergistic reconstruction of molecular structure and raw material system, the fundamental contradiction of traditional polyester fibers in environmental metabolism and resource circulation is broken. The introduction of biobased degradable polyester embeds chemical bonding units that can be recognized by the natural environment in the stable polyester molecular chain, giving the material controllable decomposition ability after disposal. Biobased synthetic polyester cuts off the parasitic dependence of fiber raw materials on geological deposits by replacing petroleum-based carbon atoms with plant-based monomers. The surface properties and microstructure of the natural fiber with liquid coloration not only provide completely biodegradable components, but also enhance the physical bonding force between fiber aggregates, forming a synergistic network that resists shear disintegration. The low-temperature and segmented temperature control design in the preparation process protects the molecular integrity of heat-sensitive biobased materials, allowing the fiber to maintain the pre-set environmental response function during subsequent processing. Ultimately, this technology transforms the linear consumption material system into a substance circulation system with ecological metabolism ability.

[0061] The following provides another embodiment, which differs from the above embodiment in that:

[0062] The environmentally friendly colored denim with added recycled polyester fibers contains the following fiber components by mass percentage:

[0063] 42%-48% recycled polyester fibers (rPET);

[0064] 28%-32% biobased degradable polyester fibers, with polyhydroxyalkanoate (PHA) replacing PLA / PBAT;

[0065] 18%-22% biobased synthetic polyester fibers, with biobased polyamide (PA56) replacing PTT / PEF;

[0066] 8%-10% natural plant fibers with liquid coloration, with dyed flax fibers replacing hemp / Lyocell.

[0067] Among them, the total proportion of biobased degradable polyester fibers (PHA) and biobased synthetic polyester fibers (PA56) is ≥40%, and the mass ratio of the two is 1:0.6-1:0.8.

[0068] The original liquid colored natural plant fiber (dyed flax) has a fineness of 1.5-1.7 dtex, a length of 36-38 mm, and a color fastness of ≥4 levels.

[0069] The fabric has a renewable carbon content of ≥55% (calculated according to the following):

[0070] The renewable carbon content of the PHA is ≥95%;

[0071] The renewable carbon content of the PA56 is ≥45%;

[0072] The renewable carbon content of the dyed flax fiber is 100%.

[0073] The preparation method of the environmentally friendly colored denim added with renewable polyester fiber comprises the following steps:

[0074] Step 1: Fiber pretreatment: immerse the dyed flax fiber in a 50-55℃ ammonia treatment liquid (containing 12% ammonia and 3% cellulose activator) for 25 minutes, and dry to a moisture content of ≤2.5%;

[0075] Step 2: Mixed opening: put rPET, PHA, PA56 and pretreated flax fiber into a cleaner according to the proportion, open and mix at 900-1100 r / min, and control the environmental humidity to be 58%-62%;

[0076] Step 3: Low-temperature spinning: after four drawing, adopt vortex spinning process, spindle speed 10000-10800 r / min, workshop temperature 23-26℃, and obtain 70-85 English denier blended yarn;

[0077] Step 4: Weaving and setting: weave on a rapier loom at 460-500 revolutions per minute, on-machine tension 2500-3000 N, and then treat in a 160-175℃ microwave setting machine at a speed of 20-25 m / min.

[0078] In step 2, the fiber length dispersion is controlled to be ≤10%, and the mixing uniformity CV value is ≤2.2%.

[0079] In step 3, the vortex spinning process has an air flow pressure of 0.45-0.55 MPa, and the yarn hairiness index H value is ≤3.0.

[0080] In step 4, the microwave setting machine adopts energy gradient control:

[0081] Early stage: 160-165℃, energy density 8kW / m 2 , stay for 30-35 seconds;

[0082] Middle stage: 170-175℃, energy density 12kW / m 2 , stay for 25-30 seconds;

[0083] Late: 165-168 °C, energy density 5 kW / m 2 , for 15-20 seconds.

[0084] In step 1, the liquid ammonia treatment liquid is added with an environmental protection aid, which contains by weight: liquid ammonia 12 parts, nano-cellulose dispersion liquid 5 parts, zinc citrate 2 parts.

[0085] Through the molecular functional reorganization of bio-based materials and the energy field driving process, a fundamental breakthrough in environmental compatibility of synthetic fibers is achieved. The seawater degradation characteristics of PHA break through the scene limitation of traditional degradable polyester which is limited to land composting. The specific hydroxy fatty acid unit in its molecular chain can be recognized and depolymerized by the extracellular enzymes secreted by marine microorganisms. Bio-based polyamide PA56 replaces petroleum-based carbon source with castor oil-derived monomer structure. The amide bond in its molecular chain presents controllable hydrolysis activity in water environment, and at the same time, it gives the fabric the function of moisture absorption and perspiration. The rough surface structure of dyed flax fiber and the microfibering induced by liquid ammonia treatment form a three-dimensional physical interlocking network in the fiber assembly, which significantly improves the yarn interface bonding strength. The microwave customized energy gradient field selectively activates the molecular motion ability of different fibers, achieving morphological stability under low thermal energy conditions and avoiding irreversible damage to bio-based materials caused by high temperature.

[0086] By introducing bio-based degradable polyester, a chemical bond structure that can be recognized by the environment is constructed in the material system. The alpha-ester bond of PLA is hydrolyzed and broken under the action of lipase secreted by soil microorganisms. The aliphatic segment of PBAT gives it flexibility and biocompatibility. When these components are combined with natural plant fibers, the cellulose microporous structure of natural fibers becomes a habitat for microorganisms, accelerating the diffusion and action of extracellular enzymes secreted by microorganisms on the surface of degradable components. More importantly, the complete biodegradation characteristics of natural fibers provide a physical support environment for degradable polyester, so that it will not form a persistent microplastic barrier during the disintegration process. This synergistic effect makes the fabric gradually lose its integrity in the landfill or marine environment, and eventually returns to the carbon cycle system of nature.

[0087] By choosing bio-based synthetic polyester, the fundamental innovation lies in the biological transformation of raw material sources. One of the monomers of PTT, propylene glycol, can be obtained by fermentation of corn glucose, and the furan dicarboxylic acid of PEF is derived from the dehydration reaction of plant fructose. This transformation makes part of the fibers no longer consume geological carbon resources, but rely on the current atmospheric carbon captured by photosynthesis. When bio-based polyester is combined with natural plant fibers, the renewable carbon ratio exceeds 50% of the overall material, meaning that the main material source of the fabric has been decoupled from the petroleum refining industry chain. Especially importantly, natural fibers do not require a chemical dyeing process, and the natural pigment or liquid coloration process eliminates the use of petroleum-based dyes, forming a double decarbonization path from the raw material end to the processing end.

[0088] The established fiber assembly system forms a double inhibition on the two aspects of physical wear leading to fiber breakage and shedding, and chemical stability causing the persistence of debris. First, the stock solution colored natural fibers enhance the inter-fiber bonding force through the surface nanoscale fibril structure, reducing the single fiber slip phenomenon during mechanical friction. The high resilience of bio-based synthetic polyester can absorb external stress and avoid brittle fracture. Second, the unique value of the biobased degradable component lies in its environmental responsiveness. When the occasional release of small polyester debris enters water or soil, the ester bond retained in the molecular chain is easy to hydrolyze under acid-base conditions. The debris with a particle size greater than 100 pm is degraded into organic acids that can be taken up by organisms within a few months, fundamentally avoiding its bioaccumulation in the food chain. This preventive design changes the one-way pollution characteristics of traditional polyester materials and turns the linear waste process into a controllable metabolic process.

[0089] While embodiments of the present application have been shown and described, it is to be understood that the embodiments described are merely divergences, modifications, replacements and variations of the embodiments of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. Environment-friendly oxford cloth added with regenerated polyester fiber, characterized in that: The fiber component comprises the following mass percentages: 40-50% recycled polyester fiber (rPET); 25-35% biobased degradable polyester fiber selected from polylactic acid (PLA) or polybutylene adipate terephthalate (PBAT); 15-25% biobased synthetic polyester fiber selected from biobased polytrimethylene terephthalate (PTT) or polyethylene furanoate (PEF); 5-10% stock solution colored natural plant fiber selected from modified hemp fiber or lyocell fiber.

2. The eco-friendly oxford fabric with added recycled polyester fiber according to claim 1, characterized in that: The total proportion of the biobased degradable polyester fiber and the biobased synthetic polyester fiber is ≥40%, and the mass ratio of the two is 1:0.5-1:

1.

3. The eco-friendly oxford fabric with added recycled polyester fibers according to claim 1, characterized in that: The stock solution colored natural plant fiber has a fineness of 1.2-1.8 dtex, a length of 34-38 mm, and a color fastness of ≥4 levels.

4. The eco-friendly oxford fabric with added recycled polyester fibers according to any one of claims 1-3, characterized in that: The renewable carbon content of the fabric is ≥50%, wherein: The renewable carbon content of the biobased degradable polyester fiber is ≥90%; The renewable carbon content of the biobased synthetic polyester fiber is ≥35%; The renewable carbon content of the stock solution colored natural plant fiber is 100%.

5. A process for the preparation of eco-friendly oxford fabric incorporating recycled polyester fibers as claimed in any one of claims 1 to 4 wherein: The method comprises the following steps: Step (1): Fiber pretreatment: immerse the stock solution colored natural plant fiber in a water-based silicon-based softener at 45-55°C for 30 minutes, and dry to a moisture content of ≤3%; Step (2): Mixed opening: put the rPET fiber, biobased degradable polyester fiber, biobased synthetic polyester fiber, and pretreated natural fiber into a cleaner according to the proportion, open and mix at 800-1000 r / min, and control the environmental humidity to be 60-65%; Step (3): Low-temperature spinning: after three drawing, use the Siro Compact spinning process in the spinning process, the spindle speed is 9500-10500 r / min, the workshop temperature is 25-28°C, and 60-80 English denier blended yarn is prepared; Step (4): Weaving and setting: weaving on an air jet loom at 480-550 revolutions per minute, on-machine tension 2800-3200 N, post-heat air setting machine treatment at 170-185°C, and speed 18-22 m / min.

6. The method of claim 5, wherein the method is characterized by: The fiber length dispersion of the opening and mixing process in step (2) is controlled to be ≤12%, and the mixing uniformity CV value is ≤2.5%.

7. The method of claim 5, wherein the method is characterized by: The twist factor of the Siro Compact spinning process in step (3) is 360-380, and the yarn hairiness index H value is ≤3.

5.

8. The method of claim 5, wherein the method is characterized by: The hot air setting machine in step (4) uses segmented temperature control: Front section (entry area): 170-175°C, stay for 40-45 seconds; Middle section (stable area): 180-185°C, stay for 35-40 seconds; Back section (exit area): 165-170°C, stay for 20-25 seconds.

9. The method of claim 5, wherein the method is characterized by: The water-based silicon-based softener in step (1) comprises the following weight parts: amino silicone oil emulsion 15-20 parts, aloe extract 3-5 parts, pH adjuster 0.5 part, and the rest is deionized water.

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