Preparation method of industrial hemp warp-knitted weft insertion fabric

Abstract

The invention discloses a preparation method of an industrial hemp warp-knitted weft insertion fabric, the industrial hemp warp-knitted weft insertion fabric comprises a warp-knitted fabric woven by knitting yarns, and weft insertion yarns which do not participate in looping are arranged between loops and extension lines of the warp-knitted fabric along the weft direction; the preparation method comprises the following steps: raw material selection: weaving yarns are polyester filaments or nylon filaments, and weft insertion yarns are industrial hemp fiber blended yarns; warping is conducted; knitting: knitting by adopting biaxial warp knitting equipment; dyeing, namely adding auxiliaries such as sodium lignosulphonate and hyperbranched molecules during dyeing of the disperse dye; a dispersing agent SS and a dyeing precipitation preventing agent are added before dyeing of the reactive dye. The industrial hemp blended yarns which do not participate in looping are arranged between the loops and the extension yarns in the warp-knitted fabric, so that the conformal performance and the strength of the warp-knitted fabric in the weft direction can be improved, and the warp-knitted fabric is prevented from deforming in the weft direction. A one-bath two-step method is adopted, and proper auxiliaries and process setting are added, so that the warp-knitted weft insertion fabric has good color fastness.

Description

Technical Field

[0001] The invention relates to a method for preparing an industrial hemp warp knitted weft-inserted fabric, and belongs to the technical field of warp knitted weft-inserted fabric production. Background Art

[0002] Hemp is an annual dicotyledonous herb of the genus Cannabis in the family Cannabaceae. It was first cultivated in Central Asia and is one of the earliest natural fibers used in the textile field by humans. It can now be produced all over the world, mainly in China, France, Russia, the United States, Canada and other countries. Because hemp fiber contains tetrahydrocannabinol (THC), this ingredient can paralyze the nerves and cause hallucinations. Hemp with a tetrahydrocannabinol content of less than 0.3% is called industrial hemp, also known as hemp, thread hemp, cold hemp, fire hemp, etc. Hemp fiber is a kind of natural fiber. Its fabric has excellent properties such as coolness and breathability, static elimination, and natural antibacterial properties, and is widely used in the textile field.

[0003] Warp knitted fabrics, as a type of knitted fabric, have the characteristics of soft hand feel, but also have insufficient stiffness. Products made with warp knitted fabrics have poor shape retention. Warp knitted weft inlay fabrics are made by adding a weft yarn that does not participate in loop formation to the warp knitted fabric, especially when the weft inlay yarn used is an industrial hemp fiber blended yarn, which can effectively improve the stiffness of the warp knitted fabric, thereby making the prepared fabric have good shape retention. In addition, the yarn involved in loop formation in the warp knitted weft inlay fabric is usually made of polyester filament or nylon filament, and the fabric composed of industrial hemp and polyester or nylon, how to ensure the color fastness of the dyed fabric becomes a problem to be solved. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing an industrial hemp warp knitted weft-inserted fabric, which adopts a one-bath two-step method to dye chemical fiber and industrial hemp respectively, and through appropriate process parameter setting, the prepared industrial hemp weft-inserted fabric has good color fastness.

[0005] To solve the above technical problems, the purpose of the present invention is achieved as follows:

[0006] The present invention relates to a method for preparing an industrial hemp warp knitted weft-inserted fabric, wherein the industrial hemp warp knitted weft-inserted fabric comprises a warp knitted fabric woven from knitting yarns, and a weft-inserted yarn not involved in loop formation is arranged along the weft direction between the coils and the extension lines of the warp knitted fabric;

[0007] The preparation method comprises the following steps:

[0008] S1. Raw material selection: the knitting yarn is selected as polyester filament or nylon filament, and the weft inlay yarn is selected as industrial hemp fiber blended yarn; the content of industrial hemp fiber in the industrial hemp fiber blended yarn is 50%-80%;

[0009] S2, warping: warping the braided yarn into warp beams according to the process requirements;

[0010] S3, weaving: biaxial warp knitting equipment is used for weaving, the weaving yarn is weaved into warp knitting yarn according to the process requirements, and the weft inlay yarn is introduced during the weaving process to make industrial hemp warp knitting weft inlay fabric;

[0011] S4, dyeing: including singeing → cold batch bleaching → washing → alkali treatment → acid neutralization → washing → drying → disperse dye dyeing → reactive dye dyeing → acid neutralization → washing → drying;

[0012] Add auxiliary agents sodium lignosulfonate and hyperbranched molecules when dyeing with disperse dyes; add dispersant SS and dyeing precipitation inhibitor before dyeing with reactive dyes;

[0013] The hyperbranched molecule is a hyperbranched polyester or a hyperbranched polyamidoamine.

[0014] On the basis of the above scheme and as a preferred scheme of the above scheme: the cold-batch bleaching refers to immersing the singed industrial hemp warp-knitted weft-inserted fabric in a cold-batch bleaching treatment liquid and rolling it to a liquid rate of 120-150%, and standing it for 20-24 hours; the cold-batch bleaching treatment liquid includes caustic soda, hydrogen peroxide, a hydrogen peroxide stabilizer, a refining penetrant, a degreasing agent and water.

[0015] 3. The method for preparing an industrial hemp warp knitted weft inlay fabric according to claim 1, characterized in that the alkali treatment is to place the industrial hemp warp knitted weft inlay fabric in a 10-20 g / L caustic soda solution with a bath ratio of 1:15-20; and treat it at 80°C for 60-90 min; and the caustic soda solution also contains 10-15 g / L sodium silicate.

[0016] On the basis of the above scheme and as a preferred scheme of the above scheme: in the disperse dyeing process, the disperse dye solution is prepared according to the bath ratio of 1:20-30, and then the industrial hemp warp knitted weft lining fabric treated with alkali is placed in the disperse dye solution, and the temperature is increased to 60°C at a heating rate of 1°C / min and maintained for 10-15min, and then the temperature is increased to 95°C at a heating rate of 1°C / min and maintained for 15-20min, and then the temperature is increased to 125-135°C at a heating rate of 1°C / min and maintained for 30-35min, and then the temperature is cooled to room temperature.

[0017] On the basis of the above scheme and as a preferred scheme of the above scheme: the disperse dye solution includes disperse dye, penetrant, sodium lignosulfonate, hyperbranched molecules, amino alcohol type surfactant, sodium sulfate, sodium hydroxide and sodium oxalate.

[0018] On the basis of the above scheme and as a preferred scheme of the above scheme: after the disperse dyeing process, first add dispersant SS and dyeing precipitation inhibitor, run the dyeing equipment for 10-15 minutes, then add reactive dye and penetrant JFC and one-quarter amount of sodium sulfate, run the dyeing equipment for 10-15 minutes, then add one-quarter amount of sodium carbonate, keep for 10-15 minutes, then heat to 50°C at a heating rate of 1°C / min, then add one-quarter amount of sodium sulfate, keep for 30-45 minutes, then add one-half amount of sodium sulfate, heat to 70-75°C, keep for 10-15 minutes, add one-quarter amount of sodium carbonate, keep for 10-15 minutes, then add one-half amount of sodium carbonate, keep for 25-30 minutes, then cool to room temperature for acid neutralization, water washing and drying.

[0019] On the basis of the above scheme and as a preferred scheme of the above scheme: the amount of the dispersant SS is 0.2% of the amount of the disperse dye, and the amount of the dyeing precipitation inhibitor is 0.5% of the amount of the disperse dye.

[0020] The beneficial effects of the present invention are as follows: the preparation method of the industrial hemp warp knitted weft-inserted fabric involved in the present invention arranges the industrial hemp blended yarn that does not participate in the looping between the coil and the extension line in the warp knitted fabric, which can improve the shape retention and strength of the warp knitted fabric in the weft direction and avoid its deformation in the weft direction. And the one-bath two-step method is adopted and the warp knitted weft-inserted fabric has good color fastness through the addition of appropriate additives and process settings. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with specific embodiments.

[0022] Example

[0023] The present embodiment involves a method for preparing an industrial hemp warp knitted weft inlay fabric, wherein the industrial hemp warp knitted weft inlay fabric comprises a warp knitted fabric woven from braided yarns, and weft inlay yarns that do not participate in loop formation are arranged along the weft direction between the coils and extension lines of the warp knitted fabric.

[0024] The preparation method comprises the following steps:

[0025] S1. Raw material selection: The knitting yarn is selected as polyester filament or nylon filament, and the weft inlay yarn is selected as industrial hemp fiber blended yarn; the content of industrial hemp fiber in the industrial hemp fiber blended yarn is 50%-80%. The industrial hemp fiber blended yarn used is a blended yarn of industrial hemp fiber and cotton fiber, with a fineness of 21 counts, and the content of industrial hemp is 60%.

[0026] S2, warping: warping the braided yarn into a warp beam according to the process requirements. In this embodiment, the braided yarn is selected as polyester filament with a fineness of 75D / 24F.

[0027] S3, weaving: biaxial warp knitting equipment is used for weaving, the weaving yarn is woven into warp knitting yarn according to the process requirements, and the weft yarn is introduced in the weaving process to make industrial hemp warp knitting weft inlay fabric. The weight of the prepared industrial hemp warp knitting weft inlay fabric is 280 grams per square meter, of which the polyester content is about 65%.

[0028] S4. Dyeing: including singeing → cold batch bleaching → water washing → alkali treatment → acid neutralization → water washing → drying → disperse dye dyeing → reactive dye dyeing → acid neutralization → water washing → drying.

[0029] The singeing process is to treat the front and back sides of the prepared industrial hemp warp knitted weft-inserted fabric to remove the fluff on the surface. The flame intensity range is 8mbar to 20mbar, and the speed is 100 to 120m / min.

[0030] The cold-batch bleaching refers to immersing the singed industrial hemp warp knitted weft-inserted fabric in a cold-batch bleaching treatment solution and rolling it to a liquid rate of 120-150%, and standing it for 20-24 hours; the cold-batch bleaching treatment solution includes 30-45g / l caustic soda, 45-60g / l hydrogen peroxide, 5-10g / l hydrogen peroxide stabilizer, 5-10g / l refining penetrant, 10-15g / l degreasing agent and water. In this embodiment, the cold-batch bleaching treatment solution includes 40g / l caustic soda, 50g / l hydrogen peroxide, 10g / l hydrogen peroxide stabilizer, 8g / l refining penetrant, 12g / l degreasing agent and water.

[0031] The industrial hemp warp knitted weft-inserted fabric that has been treated with cold-batch bleaching is then washed to remove the additives on the fiber surface of the fabric in preparation for the next step of treatment.

[0032] The alkali treatment is to place the industrial hemp warp knitted weft-inserted fabric in a 10-20g / L caustic soda solution with a bath ratio of 1:15-20; treat for 60-90min at 80°C; the caustic soda solution also contains 10-15g / L sodium silicate. In this embodiment, the caustic soda solution contains 15g / L caustic soda and 12g / L sodium silicate. The bath ratio is 1:15, and the treatment is carried out at 80°C for 75min.

[0033] After the alkali treatment, the industrial hemp warp knitted weft-inserted fabric is neutralized with acetic acid to remove the alkaline substances on the fiber surface of the fabric. It is then washed with water to remove the salt after acid neutralization, and then dried to a moisture regain of about 5%.

[0034] In the dyeing process of industrial hemp warp knitted weft-inserted fabrics, a one-bath two-step method is adopted, that is, the polyester is dyed first, and then the industrial hemp fiber and cotton fiber are dyed.

[0035] Add auxiliary agents sodium lignosulfonate and hyperbranched molecules during disperse dye dyeing. The specific disperse dye dyeing process is as follows: In the disperse dye dyeing process, the disperse dye solution is prepared according to the bath ratio of 1:20-30, and then the alkali-treated industrial hemp warp knitted weft-inserted fabric is placed in the disperse dye solution, and the temperature is increased to 60°C at a heating rate of 1°C / min, and maintained for 10 minutes, and then the temperature is increased to 95°C at a heating rate of 1°C / min, and maintained for 20 minutes, and then the temperature is increased to 130°C at a heating rate of 1°C / min, and maintained for 30 minutes, and then cooled to room temperature. The disperse dye solution includes disperse dyes, penetrant JFC, sodium lignosulfonate, hyperbranched molecules, amino alcohol surfactants, sodium sulfate, sodium hydroxide and sodium oxalate. In this embodiment, the amount of disperse dye is 2.5% of the weight of the polyester component, the amount of penetrant JFC is 10g / L, the amount of sodium lignosulfonate is 5g / L, the amount of hyperbranched molecules is 3g / L, the amount of amino alcohol type surfactant is 8g / L, the amount of sodium sulfate is 6g / L, the amount of sodium hydroxide is 9g / L, and the amount of sodium oxalate is 6g / L.

[0036] The hyperbranched molecule used is a hyperbranched polyester or a hyperbranched polyamidoamine. In this embodiment, a hyperbranched polyester is selected, and the hyperbranched polyester can be combined with polyester fiber to improve color fastness.

[0037] After the disperse dyeing process, dispersant SS and dyeing precipitation inhibitor are added first, and the dyeing equipment is operated for 10 minutes. Then, reactive dye, penetrant JFC and one-quarter amount of sodium sulfate are added. The dyeing equipment is operated for 5 minutes. Then, one-quarter amount of sodium carbonate is added and maintained for 10 minutes. Then, the temperature is increased to 50°C at a heating rate of 1°C / min. Then, one-quarter amount of sodium sulfate is added. After maintaining for 40 minutes, one-half amount of sodium sulfate is added. The temperature is increased to 75°C. After maintaining for 15 minutes, one-quarter amount of sodium carbonate is added. After maintaining for 15 minutes, one-half amount of sodium carbonate is added and maintained for 25 minutes. Then, the temperature is lowered to room temperature for acid neutralization, water washing and drying.

[0038] In the reactive dyeing process, the amount of reactive dyes is 3.0% of the total weight of industrial hemp fiber and cotton fiber, the amount of penetrant JFC is 10g / L, the total amount of sodium sulfate is 20g / L, and the total amount of sodium carbonate is 16g / L. Acid neutralization is to use acetic acid to neutralize the alkaline substances on the fiber surface.

[0039] Furthermore, the amount of the dispersant SS is 0.2% of the amount of the disperse dye, and the amount of the anti-settling agent is 0.5% of the amount of the disperse dye.

[0040] Comparative Example:

[0041] The difference from the embodiment is that: when dyeing, one-bath one-step method is used, and the dye liquor used includes 3.0% active dyes accounting for the sum of the weight of industrial hemp fiber and cotton fiber, 2.5% disperse dyes accounting for the weight of polyester components, 15g / L penetrant JFC, 20g / L dispersant NNO, 15g / L dye precipitation inhibitor and 20g / L sodium hydroxide, 15g / L sodium sulfate. The heating process is: add dye liquor and fabric at room temperature, heat up to 90℃ at a heating rate of 1℃ / min and keep for 30min, then heat up to 130℃ at a heating rate of 1℃ / min and keep for 30min. Cool down to room temperature and wash and dry.

[0042] The industrial hemp prepared in the embodiment and the comparative example was subjected to a color fastness test. The color fastness and rubbing fastness in the test were tested in the following standards: the reference standard for color fastness to washing, GB / T5713-1997; the reference standard for color fastness to soaping, GB / T3921-1997; and the reference standard for dry and wet rubbing fastness, AATCC8-1996.

[0043] The test results are as follows:

[0044] Test items Wet friction Dry Friction Soaping Washing Example Level 4 Level 4 Level 4-5 Level 4-5 Comparative Example Level 3 Level 3 Level 3-4 Level 3

[0045] It can be seen from the above test results that the industrial hemp warp knitted weft-inserted fabric prepared by the present invention has good color fastness.

[0046] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A method for preparing industrial hemp warp knitted weft-inserted fabric, characterized in that: The industrial hemp warp knitted weft-inserted fabric comprises a warp knitted fabric woven from braided yarns, and a weft-inserted yarn not involved in loop formation is arranged along the weft direction between the coils and the extension lines of the warp knitted fabric; The preparation method comprises the following steps: S1. Raw material selection: the knitting yarn is selected as polyester filament or nylon filament, and the weft inlay yarn is selected as industrial hemp fiber blended yarn; the content of industrial hemp fiber in the industrial hemp fiber blended yarn is 50%-80%; S2, warping: warping the braided yarn into warp beams according to the process requirements; S3, weaving: biaxial warp knitting equipment is used for weaving, the weaving yarn is weaved into warp knitting yarn according to the process requirements, and the weft inlay yarn is introduced during the weaving process to make industrial hemp warp knitting weft inlay fabric; S4, dyeing: including singeing → cold batch bleaching → washing → alkali treatment → acid neutralization → washing → drying → disperse dye dyeing → reactive dye dyeing → acid neutralization → washing → drying; Add auxiliary agents sodium lignosulfonate and hyperbranched molecules when dyeing with disperse dyes; add dispersant SS and dyeing precipitation inhibitor before dyeing with reactive dyes; The hyperbranched molecule is a hyperbranched polyester or a hyperbranched polyamidoamine.

2. The method for preparing an industrial hemp warp knitted weft-inserted fabric according to claim 1, characterized in that: The cold-batch bleaching refers to immersing the singed industrial hemp warp-knitted weft-inserted fabric in a cold-batch bleaching treatment liquid and rolling it to a liquid rate of 120-150%, and leaving it to stand for 20-24 hours; the cold-batch bleaching treatment liquid includes caustic soda, hydrogen peroxide, a hydrogen peroxide stabilizer, a refining penetrant, a degreasing agent and water.

3. The method for preparing an industrial hemp warp knitted weft-inserted fabric according to claim 1, characterized in that: The alkali treatment is to place the industrial hemp warp knitted weft-inserted fabric in a 10-20 g / L caustic soda solution with a bath ratio of 1:15-20; treat it at 80°C for 60-90 minutes; the caustic soda solution also contains 10-15 g / L sodium silicate.

4. The method for preparing an industrial hemp warp knitted weft-inserted fabric according to claim 1, characterized in that: In the disperse dyeing process, the disperse dye solution is prepared according to the bath ratio of 1:20-30, and then the industrial hemp warp knitted weft lining fabric treated with alkali is placed in the disperse dye solution, and the temperature is increased to 60°C at a heating rate of 1°C / min and maintained for 10-15min, and then the temperature is increased to 95°C at a heating rate of 1°C / min and maintained for 15-20min, and then the temperature is increased to 125-135°C at a heating rate of 1°C / min and maintained for 30-35min, and then cooled to room temperature.

5. The method for preparing the industrial hemp warp knitted weft-inserted fabric according to claim 4, characterized in that: The disperse dye solution comprises disperse dye, penetrant, sodium lignosulfonate, hyperbranched molecules, amino alcohol type surfactant, sodium sulfate, sodium hydroxide and sodium oxalate.

6. The method for preparing an industrial hemp warp knitted weft-inserted fabric according to claim 4, characterized in that: After the disperse dyeing process, first add dispersant SS and dyeing precipitation inhibitor, run the dyeing equipment for 10-15 minutes, then add reactive dye and penetrant JFC and one-quarter amount of sodium sulfate, run the dyeing equipment for 10-15 minutes, then add one-quarter amount of sodium carbonate, keep for 10-15 minutes, then heat to 50°C at a heating rate of 1°C / min, then add one-quarter amount of sodium sulfate, keep for 30-45 minutes, then add one-half amount of sodium sulfate, heat to 70-75°C, keep for 10-15 minutes, add one-quarter amount of sodium carbonate, keep for 10-15 minutes, then add one-half amount of sodium carbonate, keep for 25-30 minutes, then cool to room temperature for acid neutralization, water washing and drying.

7. The method for preparing the industrial hemp warp knitted weft-inserted fabric according to claim 6, characterized in that: The amount of the dispersant SS is 0.2% of the amount of the disperse dye, and the amount of the dyeing precipitation inhibitor is 0.5% of the amount of the disperse dye.