Preparation method of full-regeneration elastic fabric

Abstract

The invention discloses a preparation method of a fully-regenerated elastic fabric. Relates to the technical field of functional fabrics. Comprising the following steps: S1, spinning; regenerated PET with the viscosity difference value of 0.3-1.0 dl / g is used as a raw material, the proportion of a low-viscosity material or a high-viscosity material is 30-70%, and the proportion of the low-viscosity material plus the proportion of the high-viscosity material is 100%; spinning the low-viscosity material and the high-viscosity material serving as raw materials into yarns by using a spinning machine; s2, weaving; weaving the yarns prepared in the step S1 into gray cloth by using a weaving machine; s3, desizing is carried out; adding sodium carbonate, a scouring agent and a chelating agent into a desizing machine for treatment, and removing an oiling agent in the gray cloth; s4, dyeing; dyeing under an acidic condition, wherein the temperature of dye liquor is set to be 120-135 DEG C; s5, drying; s6, shaping and finishing; and carrying out heat setting processing by using a setting machine.

Description

Technical Field

[0001] The present invention relates to the technical field of functional fabrics, and in particular to a method for preparing fully recycled stretch fabrics. Background Art

[0002] In recent years, global attention to environmental protection and sustainable development has reached an unprecedented level. Countries have introduced a series of stringent environmental policies aimed at reducing the negative impact of the textile industry on the environment. For example, the EU's Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) Regulation imposes strict restrictions on the use of textile chemicals, prompting companies to seek more environmentally friendly production methods. Furthermore, the United Nations Sustainable Development Goals (SDGs) are guiding various industries towards sustainable transformation.

[0003] Among the existing stretch fabrics on the market, elasticity usually needs to be coated with spandex. However, spandex is a non-renewable fiber and has poor durability. Spandex is prone to deterioration after long-term wear, resulting in filamentous breakage and pilling of the fabric, loss of elasticity, and other phenomena.

[0004] In this environment, the textile industry urgently needs to develop new stretch fabrics that meet environmental requirements while ensuring product performance. Fully recycled ammonia-free stretch fabrics, with their use of recycled materials and reduced chemical pollution, are an ideal choice to meet this trend.

[0005] The present invention is based on research on recycled fully regenerated polyester yarn made from discarded plastic bottles and the like, exploring a more environmentally friendly method for preparing ammonia-free stretch fabrics. Summary of the Invention

[0006] In response to the above technical problems, the present invention provides a method for preparing an ammonia-free fully recycled stretch fabric which is environmentally friendly, elastic, durable and has low production cost.

[0007] The technical solution of the present invention is: A method for preparing a fully recycled stretch fabric comprises the following steps: S1: Spinning; using recycled PET with a viscosity difference of 0.3 to 1.0 dl / g as raw material, wherein the ratio of low-viscosity material or high-viscosity material is 30 to 70%, and the ratio of the low-viscosity material + the ratio of the high-viscosity material = 100%; spinning the low-viscosity material and the high-viscosity material into yarn using a spinning machine; S2: weaving; weaving the yarn produced in step S1 into grey cloth using a loom; S3: Desizing: adding soda ash, scouring agent and chelating agent in the desizing machine to remove the oil in the grey cloth; S4: Dyeing: Dyeing under acidic conditions, with the dye solution temperature set at 120-135°C; S5: drying; S6: Shaping and finishing; use a shaping machine for heat setting processing.

[0008] The viscosity of the low-viscosity material is 0.2-0.8 dl / g, and the viscosity of the high-viscosity material is 0.5-1.5 dl / g.

[0009] The proportion of the low-viscosity material or the high-viscosity material is 40-60%.

[0010] The cross section of the yarn produced in step S1 is in a sheath-core shape or a peanut shape.

[0011] In step S4, the pH value of the dye solution is set to 3.5-4.5.

[0012] In the step S6, the setting temperature is 140-160°C.

[0013] The present invention describes a method for producing fully recycled stretch fabric. Using fully recycled polyester as raw material, the method utilizes a unique weaving and dyeing process to innovatively achieve the production of fully recycled, ammonia-free stretch fabric. Specifically, the method uses recycled polyester with specific viscosity differences to spin yarns, which are then woven into a fabric. During high-temperature dyeing of the fabric, the fibers with varying viscosities within the yarns shrink differently, forming a crimped structure that imparts excellent elasticity comparable to spandex fabric. Furthermore, the stretch fabric produced by the present invention maintains excellent elasticity even after multiple washes, eliminating the durability issues associated with traditional spandex fabrics and enhancing both wearer comfort and aesthetics.

[0014] The present invention uses recycled materials as raw materials to prepare fabric products with excellent elasticity in an environmentally friendly and lower-cost manner, improving the pain points of traditional stretch fabrics, such as the non-renewable spandex and poor durability. It is environmentally friendly, reduces costs and increases efficiency, and has broad market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the elasticity test data of the embodiment of the present invention.

[0016] In the figure: L0-initial state, L50-state after washing 50 times. DETAILED DESCRIPTION

[0017] The following is combined with Figure 1 , further illustrating the present invention.

[0018] The present invention provides a method for preparing a fully recycled stretch fabric, comprising the following steps: S1: spinning; using recycled PET with a viscosity difference of 0.3 to 1.0 dl / g as raw material, the viscosity of the low-viscosity material is preferably 0.2 to 0.8 dl / g, and the viscosity of the high-viscosity material is preferably 0.5 to 1.5 dl / g. The recycled PET can be made from recycled plastic bottles, which is environmentally friendly and has low production costs; wherein the ratio of the low-viscosity material or the high-viscosity material is 30 to 70%, and the ratio of the low-viscosity material or the high-viscosity material is preferably 40 to 60%, and the ratio of the low-viscosity material + the ratio of the high-viscosity material = 100%; spinning the low-viscosity material and the high-viscosity material into yarn using a spinning machine; the cross-section of the yarn can be a sheath-core or peanut-shaped yarn, and the yarn fineness is 15 to 100 denier; S2: weaving; the yarn produced in step S1 is warped, sizing, and beamed, and then woven into a grey fabric with a width of 170 to 180 cm using a loom. S3: Desizing: Add soda ash, scouring agent, and chelating agent to the desizing machine for treatment. Set the temperature to 85-95°C and the desizing time to 3-5 minutes to remove the oil from the fabric. S4: Dyeing: Dye under acidic conditions, with the dye bath temperature set to 120-135°C and the pH value of the dye bath set to 3.5-4.5. The dyed fabric can also be dipped in a water-repellent resin for a water-repellent treatment, making the fabric waterproof. S5: Dry the fabric at 110-120°C. S6: Finishing: Use a setting machine for heat setting, preferably at a setting temperature of 140-160°C and a processing speed of 40-50 m / min. Example 1

[0019] Yarn was spun from recycled PET. The low-viscosity material was used at a 70% ratio and a viscosity of 0.2 dl / g; the high-viscosity material was used at a 30% ratio and a viscosity of 0.5 dl / g. The yarn was woven into a fabric with a warp density of 200 yarns / inch and a weft density of 200 yarns / inch. The fabric was desized to remove the oil. Dyeing was performed under acidic conditions, with the dye bath temperature set at 135°C and a pH of 3.5. After dyeing, the fabric was dried and set in a setting machine at 140°C. Elasticity testing of the resulting fabric revealed an initial elongation of 15% and an initial recovery of 85%. The fabric was washed 50 times, dried, and then subjected to elasticity testing, revealing an elongation of 14% and a recovery of 82%. Example 2

[0020] Recycled PET was used as the spinning material to produce yarn. The low-viscosity material was used at a 60% ratio and a viscosity of 0.5 dl / g; the high-viscosity material was used at a 40% ratio and a viscosity of 0.9 dl / g. The yarn was woven into a fabric with a warp density of 220 yarns / inch and a weft density of 220 yarns / inch. The fabric was desized to remove the oil. The fabric was then dyed under acidic conditions at a temperature of 125°C and a pH of 3.7. After dyeing, the fabric was dried and set in a setting machine at a setting temperature of 145°C. Elasticity testing of the resulting fabric revealed an initial elongation of 17% and an initial recovery of 87%. The fabric was washed 50 times, dried, and then subjected to elasticity testing, revealing an elongation of 15% and a recovery of 83%. Example 3

[0021] Recycled PET was used as the spinning material to produce yarn. The low-viscosity material was used at a 50% ratio and a viscosity of 0.8 dl / g; the high-viscosity material was used at a 50% ratio and a viscosity of 1.5 dl / g. The yarn was woven into a fabric with a warp density of 250 yarns / inch and a weft density of 250 yarns / inch. The fabric was desized to remove the oil. The fabric was then dyed under acidic conditions at a temperature of 120°C and a pH of 4.5. After dyeing, the fabric was dried and set in a setting machine at 150°C. Elasticity testing of the resulting fabric revealed an initial elongation of 18% and an initial recovery of 89%. The fabric was washed 50 times, dried, and then subjected to elasticity testing, revealing an elongation of 16% and a recovery of 85%. Example 4

[0022] Yarn was spun from recycled PET. The low-viscosity material was used at a 40% ratio and a viscosity of 0.3 dl / g; the high-viscosity material was used at a 60% ratio and a viscosity of 0.7 dl / g. The yarn was woven into a fabric with a warp density of 280 yarns / inch and a weft density of 280 yarns / inch. The fabric was desized to remove the oil. Dyeing was performed under acidic conditions at a temperature of 130°C and a pH of 4. After dyeing, the fabric was dried and set in a setting machine at 155°C. Elasticity testing of the resulting fabric revealed an initial elongation of 16% and an initial recovery of 88%. The fabric was washed 50 times, dried, and then subjected to elasticity testing, revealing an elongation of 14% and a recovery of 83%. Example 5

[0023] Yarn was spun from recycled PET. The low-viscosity material was used at a 30% ratio and a viscosity of 0.4 dl / g; the high-viscosity material was used at a 70% ratio and a viscosity of 1.4 dl / g. The yarn was woven into a fabric with a warp density of 300 yarns / inch and a weft density of 300 yarns / inch. The fabric was desized to remove the oil. Dyeing was performed under acidic conditions, with the dye bath temperature set at 125°C and a pH of 4.2. After dyeing, the fabric was dried and set in a setting machine at 160°C. Elasticity testing of the resulting fabric revealed an initial elongation of 19% and an initial recovery of 90%. The fabric was washed 50 times, dried, and then subjected to elasticity testing, revealing an elongation of 17% and a recovery of 86%.

[0024] Regarding the contents disclosed in the present invention, the following points need to be explained: (1) The embodiments disclosed in the present invention are merely examples, and any technical solution implemented by other equivalent alternative technical means shall fall within the scope of protection of the present invention; (2) In the absence of conflict, the technical features disclosed in the present invention may be combined with each other to obtain new embodiments; The above are only specific implementation methods disclosed in the present invention, but the protection scope of the present invention is not limited thereto. Technical solutions obtained by those skilled in the art after modifying or transforming certain technical features based on the contents disclosed in the present invention should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a fully recycled stretch fabric, characterized in that: The following steps are involved: S1: Spinning; Using recycled PET with a viscosity difference of 0.3 to 1.0 dl / g as raw material, wherein the proportion of low-viscosity material or high-viscosity material is 30 to 70%, and the proportion of the low-viscosity material + the proportion of the high-viscosity material = 100%; spinning the low-viscosity material and the high-viscosity material into yarn using a spinning machine; S2: weaving; weaving the yarn produced in step S1 into grey cloth using a loom; S3: Desizing: adding soda ash, scouring agent and chelating agent in the desizing machine to remove the oil in the grey cloth; S4: Dyeing: Dyeing under acidic conditions, with the dye solution temperature set at 120-135°C; S5: drying; S6: Shaping and finishing; use a shaping machine for heat setting processing.

2. The method for preparing a fully recycled stretch fabric according to claim 1, characterized in that: The viscosity of the low-viscosity material is 0.2-0.8 dl / g, and the viscosity of the high-viscosity material is 0.5-1.5 dl / g.

3. The method for preparing a fully recycled stretch fabric according to claim 1, characterized in that: The proportion of the low-viscosity material or the high-viscosity material is 40-60%.

4. The method for preparing a fully recycled stretch fabric according to claim 1, characterized in that: The cross section of the yarn produced in step S1 is in a sheath-core shape or a peanut shape.

5. The method for preparing a fully recycled stretch fabric according to claim 1, characterized in that: In step S4, the pH value of the dye solution is set to 3.5-4.

5.

6. The method for preparing a fully recycled stretch fabric according to claim 1, characterized in that: In the step S6, the setting temperature is 140-160°C.

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