A soft and hygroscopic coral fleece fabric and preparation method thereof

Abstract

The invention discloses a soft and hygroscopic coral fleece fabric and a preparation method thereof. The preparation method of the soft and hygroscopic coral fleece fabric of the invention comprises the following steps: weaving-edge-presetting-raising-soft and hygroscopic finishing-hair-resetting; wherein in the soft and hygroscopic finishing step, vinyl acetate is used as a carrier, and modified starch and modified cowpea protein are grafted to prepare the soft and hygroscopic coral fleece fabric. Compared with the prior art, the soft and hygroscopic coral fleece fabric prepared by the invention has strong softness, is not easy to wrinkle, is washable, does not shed, is easy to care for, and has excellent hygroscopic performance. The material is green and environmentally friendly, and is comfortable and beautiful to wear.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, and in particular to a soft and hygroscopic coral fleece fabric and a preparation method thereof. Background Art

[0002] People's consumption concept of textiles always changes with the development of economy and society. The change from the previous life idea of ​​being well-fed and well-clothed to the current life idea of ​​eating well and dressing well reflects the rapid development of the times and the prosperity of people's living standards. In today's modern society, with the improvement of living standards, people have higher requirements for the functionality, comfort and fashion of textiles, and pay more attention to whether the fabrics have the characteristics of safety, environmental protection, moisture absorption and perspiration, comfort and skin-friendly. According to the needs, various ways to improve the performance of fabrics are emerging in an endless stream, such as fiber blending, yarn and fabric structure design, post-processing processing methods, etc. For example, in the cold winter, people hope to wear warm and comfortable but not bloated clothes. Among them, the raised coral fleece fabric can improve the warmth effect of the fabric. This kind of fabric is formed with fluff on the surface of the fabric through some special treatment methods. The static air between the fluff has a good warmth-keeping effect, and the fabric style is unique, which meets people's aesthetic needs. Some of the pajamas, blankets and bath towels that are often used are also a kind of coral fleece fabric.

[0003] Coral fleece fabric has a rich fabric style, and the surface of the fabric has coral-like fluff characteristics. Coral fleece usually uses finer monofilament fibers, and the prepared fluff has a low initial modulus and a softer feel. Because the fluff on the surface of the fabric has a large specific surface area and a high density, it has good coverage and high air permeability and water conductivity. Because the softness of the fluff allows the fluff layer to fully fit the object being wiped, the cleaning effect is excellent, and the air between the fluff gives the fabric a warmer feel. However, coral fleece is prone to static electricity due to friction between the fluffs, and the weaving process and material selection will cause hair loss and other phenomena, affecting normal wearing performance. In addition, there is still a lot of room for improvement in the softness and hygroscopicity of the fluff.

[0004] Different types of fiber materials have different effects on the comfort of coral fleece. Taking cotton as an example of natural fiber, the prepared coral fleece fabric has good moisture absorption performance, but the cotton fiber fluff will fall over and wrinkle due to moisture absorption and expansion; because cotton fiber has low strength, a round cross-section, and natural curl, it is easy to shed during wearing. Taking ordinary polyester as an example of synthetic fiber, coral fleece fabric has good shape retention, high fiber strength and is not easy to shed and wrinkle, but has poor moisture absorption performance, is easy to generate static electricity, and the fiber is easy to entangle and absorb dust. It feels rough and easily produces a stuffy feeling. At present, the usual practice to address the above shortcomings is to blend natural fibers with chemical fibers, reasonably control the functional expression of various fibers, and achieve the purpose of improving comfort. However, this method will lose the advantageous performance of the fiber and increase the difficulty of fabric processing. Therefore, research on improving the comprehensive performance of coral fleece fabrics needs further breakthroughs.

[0005] In order to improve the hygroscopic performance of coral fleece fabric, CN112410978A discloses a method for preparing a highly absorbent double-sided printed polyester brocade coral fleece fabric. The white grey cloth is subjected to processes such as seaming, a primary pre-setting treatment, fiber opening treatment, a secondary stentering setting treatment, high-temperature color fixing, raising and sorting, and a tertiary setting treatment to prepare a highly absorbent double-sided printed polyester brocade coral fleece fabric. The preparation method of the present invention has a simple process and low cost. The prepared polyester brocade coral fleece fabric can not only maintain the excellent quality of polyester brocade and coral fleece fabrics, but also can maintain its good water absorption when the fabric is subjected to double-sided printing treatment. However, this method has a certain destructive effect on the fiber structure, causing the coral fleece fabric to easily shed during use, and the prepared fluff feels harder.

[0006] The publication number CN111118626A relates to a method for preparing coral fleece fabric, which uses special-shaped semi-dull polyester drawn yarn as the raw material of wool yarn. The preparation process of the special-shaped semi-dull polyester drawn yarn is as follows: PET melt is extruded from the three-leaf spinneret hole on the spinneret plate and then cooled by annular blowing. The three leaves of the three-leaf spinneret hole are equal in length and unequal in width, distributed in concentric circles, and the center line of the narrowest leaf passes through the center of the circle and points away from the center of the circle. Polyester FDY yarn is used as the base yarn raw material, and the two are woven to obtain plush grey cloth, and then the coral fleece fabric is obtained through pre-forming, soft finishing, fluff opening, napping, finishing and re-forming; the preparation method is simple to operate, and the obtained coral fleece fabric has fluffy, plump, soft hand feel, and good warmth retention. However, this method mainly starts from the cross-sectional morphology of polyester fiber, and the prepared coral fleece fabric has poor moisture absorption performance.

[0007] Publication No. CN103395235A discloses a windproof and breathable coral fleece fabric and a production method thereof, in which a microporous windproof and breathable film and a single-brush single-roll fabric are sequentially attached to the coral fleece fabric by glue; the single-brush single-roll fabric is weft-knitted by a plain needle coil and a terry coil with an elongated sedimentation arc, and the number of polyester yarns in the warp direction of one inch of the single-brush single-roll fabric is 21, and the number of polyester yarns in the weft direction is 23; the raw materials of the plain needle coil and the terry coil are both polyester yarns, and the polyester yarn specifications of the plain needle coil are 75D / 36F, and the polyester yarn specifications of the terry coil are 75D / 72F. The coral fleece fabric has both the effect of windproof and the effect of discharging moisture from the clothes. However, the glue used in the fabric has the disadvantages of being environmentally unfriendly, poor air permeability and stability. Summary of the invention

[0008] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to construct a soft and moisture-absorbing coral fleece fabric by chemical grafting with a significant effect.

[0009] To achieve the above object, the present invention provides a method for preparing a soft and hygroscopic coral fleece fabric, comprising the following steps:

[0010] Step 1, weaving: using polyester ultra-fine low-elastic yarn as base yarn and polyester monofilament as wool yarn, placing the two in a warp knitting machine for weaving to prepare a grey cloth;

[0011] Step 2, sewing edge: sewing edge treatment is performed on the grey cloth to make single-sided grey cloth;

[0012] Step 3, pre-forming: the prepared single-sided grey cloth is pre-formed by using a setting machine, and the pre-forming temperature, operating speed and fan speed in the setting machine are controlled to obtain the pre-formed grey cloth;

[0013] Step 4, raising: drying and raising one side of the predetermined blank fabric in S3 to prepare coral fleece fabric;

[0014] Step 5, soft and hygroscopic finishing: pre-treat the coral fleece fabric, prepare a soft and hygroscopic finishing agent, and finish the pre-treated coral fleece fabric with the soft and hygroscopic finishing agent; then wash and dry to obtain the modified coral fleece fabric;

[0015] Step 6, hair sorting: use combing equipment to comb the modified coral fleece fabric, and use a shearing machine to shear the fabric;

[0016] Step 7: Reshaping: The fabric is reshaped by a shaping machine to obtain a soft and moisture-absorbing coral fleece fabric.

[0017] Preferably, in step 1, the polyester ultrafine low-elastic yarn and polyester monofilament are calculated by weight: the polyester ultrafine low-elastic yarn is 30-50 parts, and the polyester monofilament is 50-70 parts; the polyester ultrafine low-elastic yarn has a linear density of 100-200D, a hole number of 200-400F, and a polyester monofilament linear density of 100-300D; the grey cloth weight is 200-300g / m 2 .

[0018] Preferably, in step 2, a wool outer seam edge is used, and the seam edge width is about 3 to 5 cm.

[0019] Preferably, in step 3, the temperature of the setting machine is 200-240° C., the vehicle speed is 30-40 m / min, and the fan speed is 1200-1600 r / min.

[0020] Preferably, the drying and raising process parameters described in step 4 are as follows: the drying temperature is 225-250° C., the grey cloth travel speed during the drying process is 16-25 m / min; the raising speed is 6-14 m / min, the raising tension is 0.5-2.0%, and the cylinder speed is 60-100 r / min.

[0021] Preferably, the processing steps of the soft moisture absorption finishing in step 5 are as follows, and the following parts are all parts by weight:

[0022] S1. At room temperature, 10 to 30 parts of the coral fleece fabric obtained in step 4 are soaked in 70 to 90 parts of 10 to 30 g / L nitric acid aqueous solution for 10 to 30 min; then the coral fleece fabric is washed with water and dried in an oven at 50 to 80°C for 10 to 50 min to obtain nitro coral fleece fabric; then the nitro coral fleece fabric is immersed in 60 to 100 parts of 10 to 30 g / L sodium sulfide aqueous solution at 40 to 80°C for 10 to 50 min; then the temperature is raised to 100 to 120°C and soaked for 20 to 40 min; then the fabric is washed with water and dried in an oven at a temperature of 50 to 80°C for 10 to 50 min to obtain pretreated coral fleece fabric;

[0023] S2, adding 3 to 5 parts of epoxy resin to 90 to 100 parts of water to prepare an epoxy resin aqueous solution, and then adding 2 to 5 parts of tetrabutylammonium bromide to the epoxy resin aqueous solution to prepare a crosslinking agent mixed solution; then adding 10 to 30 parts of epichlorohydrin to the crosslinking agent mixed solution at a rate of 0.5 to 1 mL / min, adjusting the solution water bath temperature to 30 to 50° C., and reacting for 10 to 30 minutes; then adjusting the pH to 8 to 10 with 100 to 300 g / L sodium hydroxide aqueous solution to obtain a mixed solution;

[0024] S3, 300-400 parts of water, 5-10 parts of starch, 1-2 parts of polyvinyl alcohol, 3-8 parts of 10-30wt% emulsifier MOA-20 aqueous solution and 5-15 parts of 3-5wt% sodium tripolyphosphate buffer solution are mixed and added to a reaction container, the air in the container is discharged, an equal volume of nitrogen is injected, the temperature of the container is adjusted to 50-70°C, and the reaction is stirred for 0.5-2h; then 10-20 parts of vinyl acetate, 0.1-0.2 parts of methacrylic acid, 0.01-0.1 parts of azobisisobutyronitrile and 8-15 parts of water are prepared into a mixture, and the mixture is added dropwise to the reaction container at a dropping speed of 0.1-1mL / min. After the addition is completed, the temperature is increased to 70-80°C, and the reaction is stirred for 4-8h. Finally, the reaction solution is cooled to 15-25°C, and filtered through a 200-300 mesh nylon net to obtain an emulsion;

[0025] S4, add 5-10 parts of cowpea protein to 80-100 parts of water, and then add 100-300g / L sodium hydroxide aqueous solution to adjust the pH to 8-10 to prepare a cowpea protein solution. Add 7-12 parts of the mixed solution obtained in step S2 and 15-20 parts of the emulsion obtained in step S3 to the cowpea protein solution, stir at room temperature for 5-15 minutes to obtain a soft hygroscopic finishing agent; then soak the pretreated coral fleece fabric obtained in step S1 in the soft hygroscopic finishing agent, heat it to 50-70°C for reaction for 20-40 minutes, and then heat it to 90-120°C for reaction for 20-40 minutes; finally, wash the obtained fabric in 100-300 parts of 1-3wt% sodium carbonate aqueous solution for 1-5 times, and then dry it in an oven at a temperature of 50-80°C for 20-50 minutes to obtain a modified coral fleece fabric.

[0026] Preferably, the brush feeding speed of the combing equipment in step 6 is 12-15 m / min, and the brush roller speed is 300-380 r / min; the shearing parameters of the shearing machine are: vehicle speed 10-20 m / min, forward speed of the circular knife in the shearing machine 700-1000 r / min, and the remaining hair length is 4-6 mm.

[0027] Preferably, in step 7, the setting temperature of the setting machine is 180-220° C., and the grey cloth speed is 16-25 m / min.

[0028] Fabrics made of polyester fibers are often used in the textile field, especially in the clothing field, due to their high mechanical strength, high chemical resistance, good wrinkle resistance, good dimensional stability, and low cost. However, polyester fibers have limited hydrophilicity, low moisture regain, high fiber stiffness, strong itching when worn, and poor protection against ultraviolet radiation. Therefore, the modification of the differential functions of polyester fibers is an important research direction. The usual environmentally friendly practice to enhance hydrophilic properties is to graft proteins extracted from animals and plants onto the surface of polyester fabrics through chemical crosslinkers to improve the hydrophilicity of the polyester fabric surface. Although these methods have greatly improved the performance of polyester fibers and fabrics, the specific protein raw materials are expensive and the crosslinkers are not environmentally friendly materials, which will cause harm to the environment and skin. Therefore, it is still a huge challenge to obtain natural proteins from environmentally friendly biopolymers.

[0029] In view of the high stiffness of polyester fibers, softeners currently available on the global market generally have a special chemical structure, mainly including two long hydrophobic alkyl chains. Therefore, the surface of yarn and fabric treated with softeners can easily become hydrophobic. Among them, ion complex softeners are composed of cationic surfactants and anionic surfactants with branched alkyl groups. This type of softener can effectively improve the water absorption of fabrics. For example, imidazole salt softeners are synthesized from low-cost materials such as fatty acids and diethylenetriamine. They can bring a soft feel to textiles, but they will inhibit the establishment of a water-mediated network between fibers through hydrogen bonds, reducing the water absorption performance of textiles.

[0030] In order to reduce the rigidity of polyester fiber and give it good hygroscopic properties, small hydrophilic particles are introduced on the surface of polyester fiber to construct a protruding structure, thereby adding a new hydrophilic surface. Vinyl acetate and cationic starch are copolymerized to obtain hydrophilic particles, in which the prepared hydrophilic particles do not maintain the original round shape on the surface of polyester fiber, but are plasticized by water and adhere to the polyester fiber due to the low glass transition temperature of vinyl acetate. The polyester fiber is firmly wrapped by the highly hydrophilic hydrophilic particles to form a protruding structure, which has a good softness effect on the polyester fiber and can graft hydrophilic groups to give the fabric hygroscopic properties.

[0031] Cowpea is a small kidney-shaped seed belonging to the legume family. Cowpea is rich in protein, bioactive compounds and antioxidant flavonoids. Cowpea contains different amino acids that can generate long-chain molecules. Amino groups can combine with cowpea protein to produce active polymers that improve the hygroscopicity and UV protection of fabrics. Therefore, modified cowpea protein and modified starch can be grafted onto the surface of polyester coral fleece fabric by polymer grafting to enhance the softness, hygroscopicity and UV protection level of polyester coral fleece fabric. First, the polyester coral fleece fabric is pretreated with nitric acid solution to attach nitro groups, which are then reduced to amino groups; then, epoxy resin and epichlorohydrin are substituted in an alkaline medium to synthesize a crosslinker. The amino acids of cowpea protein are zwitterions under neutral conditions, and have both negative carboxyl groups and positive amino groups. Cowpea protein is cured by substitution with oxygen in the crosslinker under alkaline conditions; then, it is combined with the amino groups on the pretreated polyester coral fleece fabric to graft modified cowpea protein and modified starch polymers on the pretreated polyester coral fleece fabric. A hydrophilic cross-linked network is formed on the surface of the polyester coral fleece fabric, which gives the polyester coral fleece fabric softness, moisture absorption and UV protection.

[0032] Due to the adoption of the above technical scheme, compared with the prior art, the preparation method of the soft and hygroscopic coral fleece fabric of the present invention has the following advantages: 1) The coral fleece fabric prepared by polyester filament has the characteristics of not easy to wrinkle, washable, no linting, and easy to care for. 2) Starch and cowpea protein are grafted onto the coral fleece fabric by a specific grafting method, which gives the coral fleece fabric the characteristics of soft, hygroscopic and UV-proof, and enhances the excellent wearing comfort of the fabric. 3) Natural polymer compounds are grafted onto the coral fleece fabric by chemical bonds, and the fabric is soft, hygroscopic and UV-proof with strong durability, and the material is green and environmentally friendly. DETAILED DESCRIPTION

[0033] Sources of main raw materials and equipment models in the examples:

[0034] Polyester ultra-fine low-elastic yarn: Suzhou Hande Chemical Fiber Co., Ltd., linear density 150D, number of holes 288F.

[0035] Polyester monofilament: Dongguan Shenglan Textile Co., Ltd., linear density 200D.

[0036] Epoxy resin: Zhengzhou Wubaotong Trading Co., Ltd., viscosity: 25000.

[0037] Starch: Changzhou Yaoshengmei Environmental Protection Technology Co., Ltd., moisture ≤14%, grade: superior quality.

[0038] Polyvinyl alcohol: Guangdong Wengjiang Chemical Reagent Co., Ltd., alcoholysis degree 87.0-89.0%, viscosity 40.0-48.0 mPa.s.

[0039] Emulsifier MOA-20: Jiangsu Sixin Interface Agent Technology Co., Ltd., CAS No.: 61736-68-3.

[0040] Vinyl acetate: CAS number: 108-05-4.

[0041] Cowpea protein: Xi'an Musen Bioengineering Co., Ltd.

[0042] Example 1

[0043] A method for preparing a soft and hygroscopic coral fleece fabric comprises the following steps, wherein the following parts are all parts by weight:

[0044] Step 1, weaving: Use 40 parts of 150D / 288F polyester ultra-fine low-elastic yarn as the base yarn and 60 parts of 200D polyester monofilament as the wool yarn, and weave them in a warp knitting machine to prepare a weight of 280g / m 2 Grey fabric;

[0045] Step 2, hemming: hemming the grey cloth, using the method of hemming with fur outside, with the hemming width of about 4cm, to make a single-sided grey cloth;

[0046] Step 3, pre-forming: the prepared single-sided grey cloth is pre-formed by a setting machine, the pre-forming temperature in the setting machine is controlled to be 220°C, the running speed is 35m / min, and the fan speed is 1500r / min, to obtain a pre-formed grey cloth;

[0047] Step 4, drying and fluffing: drying the predetermined shaped fabric in S3, the drying temperature is 230° C., the fabric travel speed during the drying process is 20 m / min; single-sided fluffing, the fluffing speed is 10 m / min, the fluffing tension is 1.2%, and the cylinder speed is 80 r / min, to prepare coral fleece fabric;

[0048] Step 5, soft and hygroscopic finishing: pre-treat the coral fleece fabric, prepare a soft and hygroscopic finishing agent, finish the pre-treated coral fleece fabric with the soft and hygroscopic finishing agent, and then wash and dry to obtain the modified coral fleece fabric;

[0049] Step 6, hair sorting: Use combing equipment to comb the modified coral fleece fabric to make the fluff smoother. The feeding speed of the brush is 13m / min, and the speed of the brush roller is 340r / min. Then use a shearing machine to shear the fabric to make the length of the fluff uniform. The shearing speed is 15m / min, the forward speed of the circular knife in the shearing machine is 800r / min, and the length of the remaining hair is 5mm.

[0050] Step 7, reshaping: The fabric is reshaped by a shaping machine, the shaping temperature is 200°C, and the grey cloth speed is 20m / min to obtain a soft and hygroscopic coral fleece fabric.

[0051] The processing steps of the soft moisture absorption finishing in step 5 are as follows, and the following parts are all parts by weight:

[0052] S1. At room temperature, 20 parts of the coral fleece fabric obtained in step 4 are soaked in 80 parts of a 20g / L nitric acid aqueous solution for 20 minutes to introduce nitro groups; then the coral fleece fabric is washed with water, and the coral fleece fabric is dried in a 70°C oven for 30 minutes to obtain a nitro coral fleece fabric; then the nitro coral fleece fabric is immersed in 80 parts of a 20g / L sodium sulfide aqueous solution at 60°C for 30 minutes; then the temperature is raised to 110°C and soaked for 30 minutes; then the nitro coral fleece fabric is taken out, washed with water, and dried in an oven at 60°C for 30 minutes to obtain a pretreated coral fleece fabric;

[0053] S2, adding 4 parts of epoxy resin crosslinking agent to 98 parts of water to prepare an epoxy resin crosslinking agent aqueous solution, and then adding 3 parts of tetrabutylammonium bromide to the epoxy resin crosslinking agent aqueous solution, tetrabutylammonium bromide as a lipophilic agent, to prepare a crosslinking agent mixed solution; then adding 20 parts of epichlorohydrin to the crosslinking agent mixed solution at a rate of 0.8 mL / min, adjusting the solution water bath temperature to 40°C, reacting for 20 minutes, and adjusting the pH to 9 with 100 g / L sodium hydroxide aqueous solution to obtain a mixed solution;

[0054] S3, 325 parts of water, 7.4 parts of starch, 1.2 parts of polyvinyl alcohol, 5.5 parts of 20wt% emulsifier MOA-20 aqueous solution and 10 parts of 3.7wt% sodium tripolyphosphate buffer solution were mixed and added into a closed reaction container, the reaction container was equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen inlet tube, the air in the container was first discharged, an equal volume of nitrogen was flushed in, the temperature of the container was adjusted to 60°C, and the reaction was stirred for 1h; then 17 parts of vinyl acetate, 0.18 parts of methacrylic acid, 0.034 parts of azobisisobutyronitrile and 12 parts of water were configured into a mixture, and the mixture was added dropwise to the reaction container at a dropping speed of 0.5mL / min. After the addition was completed, the temperature was raised to 75°C, and the reaction was stirred for 6h. Finally, the reaction solution was cooled to room temperature 20°C, and filtered with a 255-mesh nylon mesh to obtain an emulsion;

[0055] S4, adding 7 parts of cowpea protein to 90 parts of water, and then adding 100g / L sodium hydroxide aqueous solution to adjust the pH to 9 to prepare a cowpea protein solution; adding 10 parts of the mixed solution obtained in step S2 and 17 parts of the emulsion prepared in step S3 to the cowpea protein solution, stirring at room temperature for 10 minutes to obtain a soft hygroscopic finishing agent; then soaking the pretreated coral fleece fabric obtained in step S1 in the soft hygroscopic finishing agent, heating to 60°C for reaction for 30 minutes, and then heating to 100°C for reaction for 30 minutes; finally, washing the obtained fabric in 200 parts of 1wt% sodium carbonate aqueous solution for 3 times, and then drying it in an oven at a temperature of 60°C for 40 minutes to obtain a modified coral fleece fabric.

[0056] Example 2

[0057] It is basically the same as Example 1, the only difference is that:

[0058] The processing steps of the soft moisture absorption finishing in step 5 are as follows, and the following parts are all parts by weight:

[0059] S1. At room temperature, 20 parts of the coral fleece fabric obtained in step 4 are soaked in 80 parts of a 20g / L nitric acid aqueous solution for 20 minutes to introduce nitro groups; then the coral fleece fabric is washed with water, and the coral fleece fabric is dried in a 70°C oven for 30 minutes to obtain a nitro coral fleece fabric; then the nitro coral fleece fabric is immersed in 80 parts of a 20g / L sodium sulfide aqueous solution at 60°C for 30 minutes; then the temperature is raised to 110°C and soaked for 30 minutes; then the nitro coral fleece fabric is taken out, washed with water, and dried in an oven at 60°C for 30 minutes to obtain a pretreated coral fleece fabric;

[0060] S2, adding 4 parts of epoxy resin crosslinking agent to 98 parts of water to prepare an epoxy resin crosslinking agent aqueous solution, and then adding 3 parts of tetrabutylammonium bromide to the epoxy resin crosslinking agent aqueous solution, tetrabutylammonium bromide as a lipophilic agent, to prepare a crosslinking agent mixed solution; then adding 20 parts of epichlorohydrin to the crosslinking agent mixed solution at a rate of 0.8 mL / min, adjusting the solution water bath temperature to 40°C, reacting for 20 minutes, and adjusting the pH to 9 with 100 g / L sodium hydroxide aqueous solution to obtain a mixed solution;

[0061] S3, 332.4 parts of water, 1.2 parts of polyvinyl alcohol, 5.5 parts of 20wt% emulsifier MOA-20 aqueous solution and 10 parts of 3.7wt% sodium tripolyphosphate buffer solution were mixed and added into a closed reaction container, the reaction container was equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen inlet tube, the air in the container was first discharged, an equal volume of nitrogen was injected, the temperature of the container was adjusted to 60°C, and the reaction was stirred for 1h; then 17 parts of vinyl acetate, 0.18 parts of methacrylic acid, 0.034 parts of azobisisobutyronitrile and 12 parts of water were prepared into a mixture, and the mixture was added dropwise to the reaction container at a dropping speed of 0.5mL / min. After the addition was completed, the temperature was raised to 75°C, and the reaction was stirred for 6h. Finally, the reaction solution was cooled to room temperature 20°C, and filtered with a 255-mesh nylon net to obtain an emulsion;

[0062] S4, adding 7 parts of cowpea protein to 90 parts of water, and then adding 100g / L sodium hydroxide aqueous solution to adjust the pH to 9 to prepare a cowpea protein solution; adding 10 parts of the mixed solution obtained in step S2 and 17 parts of the emulsion prepared in step S3 to the cowpea protein solution, stirring at room temperature for 10 minutes to obtain a soft hygroscopic finishing agent; then soaking the pretreated coral fleece fabric obtained in step S1 in the soft hygroscopic finishing agent, heating to 60°C for reaction for 30 minutes, and then heating to 100°C for reaction for 30 minutes; finally, washing the obtained fabric in 200 parts of 1wt% sodium carbonate aqueous solution for 3 times, and then drying it in an oven at a temperature of 60°C for 40 minutes to obtain a modified coral fleece fabric.

[0063] Example 3

[0064] It is basically the same as Example 1, the only difference is that:

[0065] The processing steps of the soft moisture absorption finishing in step 5 are as follows, and the following parts are all parts by weight:

[0066] S1. At room temperature, 20 parts of the coral fleece fabric obtained in step 4 are soaked in 80 parts of a 20g / L nitric acid aqueous solution for 20 minutes to introduce nitro groups; then the coral fleece fabric is washed with water, and the coral fleece fabric is dried in a 70°C oven for 30 minutes to obtain a nitro coral fleece fabric; then the nitro coral fleece fabric is immersed in 80 parts of a 20g / L sodium sulfide aqueous solution at 60°C for 30 minutes; then the temperature is raised to 110°C and soaked for 30 minutes; then the nitro coral fleece fabric is taken out, washed with water, and dried in an oven at 60°C for 30 minutes to obtain a pretreated coral fleece fabric;

[0067] S2, adding 4 parts of epoxy resin crosslinking agent to 98 parts of water to prepare an epoxy resin crosslinking agent aqueous solution, and then adding 3 parts of tetrabutylammonium bromide to the epoxy resin crosslinking agent aqueous solution, tetrabutylammonium bromide as a lipophilic agent, to prepare a crosslinking agent mixed solution; then adding 20 parts of epichlorohydrin to the crosslinking agent mixed solution at a rate of 0.8 mL / min, adjusting the solution water bath temperature to 40°C, reacting for 20 minutes, and adjusting the pH to 9 with 100 g / L sodium hydroxide aqueous solution to obtain a mixed solution;

[0068] S3, 325 parts of water, 7.4 parts of starch, 1.2 parts of polyvinyl alcohol, 5.5 parts of 20wt% emulsifier MOA-20 aqueous solution and 10 parts of 3.7wt% sodium tripolyphosphate buffer solution were mixed and added into a closed reaction vessel, the reaction vessel was equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen inlet tube, the air in the container was first discharged, an equal volume of nitrogen was flushed in, the temperature of the container was adjusted to 60°C, and the reaction was stirred for 1h; then 0.18 parts of methacrylic acid, 0.034 parts of azobisisobutyronitrile and 29 parts of water were prepared into a mixture, and the mixture was added dropwise to the reaction vessel at a dropping speed of 0.5mL / min. After the addition was completed, the temperature was raised to 75°C, and the reaction was stirred for 6h. Finally, the reaction solution was cooled to room temperature 20°C, and filtered with a 255-mesh nylon net to obtain an emulsion;

[0069] S4, adding 7 parts of cowpea protein to 90 parts of water, and then adding 100g / L sodium hydroxide aqueous solution to adjust the pH to 9 to prepare a cowpea protein solution; adding 10 parts of the mixed solution obtained in step S2 and 17 parts of the emulsion prepared in step S3 to the cowpea protein solution, stirring at room temperature for 10 minutes to obtain a soft hygroscopic finishing agent; then soaking the pretreated coral fleece fabric obtained in step S1 in the soft hygroscopic finishing agent, heating to 60°C for reaction for 30 minutes, and then heating to 100°C for reaction for 30 minutes; finally, washing the obtained fabric in 200 parts of 1wt% sodium carbonate aqueous solution for 3 times, and then drying it in an oven at a temperature of 60°C for 40 minutes to obtain a modified coral fleece fabric.

[0070] Example 4

[0071] It is basically the same as Example 1, the only difference is that:

[0072] The processing steps of the soft moisture absorption finishing in step 5 are as follows, and the following parts are all parts by weight:

[0073] S1. At room temperature, 20 parts of the coral fleece fabric obtained in step 4 are soaked in 80 parts of a 20g / L nitric acid aqueous solution for 20 minutes to introduce nitro groups; then the coral fleece fabric is washed with water, and the coral fleece fabric is dried in a 70°C oven for 30 minutes to obtain a nitro coral fleece fabric; then the nitro coral fleece fabric is immersed in 80 parts of a 20g / L sodium sulfide aqueous solution at 60°C for 30 minutes; then the temperature is raised to 110°C and soaked for 30 minutes; then the nitro coral fleece fabric is taken out, washed with water, and dried in an oven at 60°C for 30 minutes to obtain a pretreated coral fleece fabric;

[0074] S2, adding 4 parts of epoxy resin crosslinking agent to 98 parts of water to prepare an epoxy resin crosslinking agent aqueous solution, and then adding 3 parts of tetrabutylammonium bromide to the epoxy resin crosslinking agent aqueous solution, tetrabutylammonium bromide as a lipophilic agent, to prepare a crosslinking agent mixed solution; then adding 20 parts of epichlorohydrin to the crosslinking agent mixed solution at a rate of 0.8 mL / min, adjusting the solution water bath temperature to 40°C, reacting for 20 minutes, and adjusting the pH to 9 with 100 g / L sodium hydroxide aqueous solution to obtain a mixed solution;

[0075] S3, 325 parts of water, 7.4 parts of starch, 1.2 parts of polyvinyl alcohol, 5.5 parts of 20wt% emulsifier MOA-20 aqueous solution and 10 parts of 3.7wt% sodium tripolyphosphate buffer solution were mixed and added into a closed reaction vessel, the reaction vessel was equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen inlet tube, the air in the container was first discharged, an equal volume of nitrogen was flushed in, the temperature of the container was adjusted to 60°C, and the reaction was stirred for 1h; then 17 parts of vinyl acetate, 0.18 parts of methacrylic acid, 0.034 parts of azobisisobutyronitrile and 12 parts of water were configured into a mixture, and the mixture was added dropwise to the reaction vessel at a dropping speed of 0.5mL / min. After the addition was completed, the temperature was raised to 75°C, and the reaction was stirred for 6h. Finally, the reaction solution was cooled to room temperature 20°C, and filtered with a 255-mesh nylon mesh to obtain an emulsion;

[0076] S4, take 97 parts of water, add 100g / L sodium hydroxide aqueous solution to adjust the pH to 9, and prepare an aqueous solution; add 10 parts of the mixed solution obtained in step S2 and 17 parts of the emulsion prepared in step S3 to the aqueous solution, stir at room temperature for 10 minutes to obtain a soft hygroscopic finishing agent; then soak the pretreated coral fleece fabric obtained in step S1 in the soft hygroscopic finishing agent, heat it to 60°C and react for 30 minutes, and then heat it to 100°C and react for 30 minutes; finally, wash the obtained fabric in 200 parts of 1wt% sodium carbonate aqueous solution for 3 times, and then dry it in an oven at a temperature of 60°C for 40 minutes to obtain a modified coral fleece fabric.

[0077] Comparative Example 1

[0078] It is basically the same as Example 1, the only difference is that:

[0079] The processing steps of the soft moisture absorption finishing in step 5 are as follows, and the following parts are all parts by weight:

[0080] S1. At room temperature, 20 parts of the coral fleece fabric obtained in step 4 are soaked in 80 parts of a 20g / L nitric acid aqueous solution for 20 minutes to introduce nitro groups; then the coral fleece fabric is washed with water, and the coral fleece fabric is dried in a 70°C oven for 30 minutes to obtain a nitro coral fleece fabric; then the nitro coral fleece fabric is immersed in 80 parts of a 20g / L sodium sulfide aqueous solution at 60°C for 30 minutes; then the temperature is raised to 110°C and soaked for 30 minutes; then the nitro coral fleece fabric is taken out, washed with water, and dried in an oven at 60°C for 30 minutes to obtain a pretreated coral fleece fabric;

[0081] S2, adding 4 parts of epoxy resin crosslinking agent to 98 parts of water to prepare an epoxy resin crosslinking agent aqueous solution, and then adding 3 parts of tetrabutylammonium bromide to the epoxy resin crosslinking agent aqueous solution, tetrabutylammonium bromide as a lipophilic agent, to prepare a crosslinking agent mixed solution; then adding 20 parts of epichlorohydrin to the crosslinking agent mixed solution at a rate of 0.8 mL / min, adjusting the solution water bath temperature to 40°C, reacting for 20 minutes, and adjusting the pH to 9 with 100 g / L sodium hydroxide aqueous solution to obtain a mixed solution;

[0082] S3, 332.4 parts of water, 1.2 parts of polyvinyl alcohol, 5.5 parts of 20wt% emulsifier MOA-20 aqueous solution and 10 parts of 3.7wt% sodium tripolyphosphate buffer solution were mixed and added into a closed reaction container, the reaction container was equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen inlet tube, the air in the container was first discharged, an equal volume of nitrogen was injected, the temperature of the container was adjusted to 60°C, and the reaction was stirred for 1h; then 0.18 parts of methacrylic acid, 0.034 parts of azobisisobutyronitrile and 29 parts of water were prepared into a mixture, and the mixture was added dropwise to the reaction container at a dropping speed of 0.5mL / min. After the addition was completed, the temperature was raised to 75°C, and the reaction was stirred for 6h. Finally, the reaction solution was cooled to room temperature 20°C, and filtered with a 255-mesh nylon mesh to obtain an emulsion;

[0083] S4, take 97 parts of water, add 100g / L sodium hydroxide aqueous solution to adjust the pH to 9, and prepare an aqueous solution; add 10 parts of the mixed solution obtained in S2 and 17 parts of the emulsion prepared in step S3 to the aqueous solution, stir at room temperature for 10 minutes to obtain a soft hygroscopic finishing agent; then soak the pretreated coral fleece fabric obtained in S1 in the soft hygroscopic finishing agent, heat it to 60°C and react for 30 minutes, and then heat it to 100°C and react for 30 minutes; finally, wash the obtained fabric in 200 parts of 1wt% sodium carbonate aqueous solution for 3 times, and then dry it in an oven at a temperature of 60°C for 40 minutes to obtain a modified coral fleece fabric.

[0084] Test Example 1

[0085] Itch test: According to the test method of the master's thesis (Research on Improving the Itch of Ramie Fabrics, author: Tian Zhe, Donghua University, 2013), a compression instrument was used to measure the compression performance of the plush on the surface of the sample fabric.

[0086] The pressure on the plush on the surface of the sample at the end of the compression stage indicates the boundary pressure. The length, quantity and rigidity of the plush are important factors affecting the boundary pressure. The compression ratio work indicates the work consumed per unit compression displacement. The boundary pressure (cN) and compression ratio work (cN) when the plush on the surface of the sample is compressed are important observation indicators for judging the itching sensation and softness. The length and quantity of the plush in this sample are almost the same, so the test indicators can directly reflect the rigidity of the plush, and further reflect the softness of the coral fleece fabric. The test results are shown in Table 1.

[0087] The calculation formula between the itch value (five-point score) and the cut-off pressure is: itch value = -1.908 + 4.008 × cut-off pressure (cN).

[0088] Sample: The test sample size is 20cm x 8cm. Three pieces of each sample are tested and the average value is taken.

[0089] Table 1: Test results of the itching sensation of the samples

[0090]

[0091] It can be seen from the test results of the pricking sensation of the samples that the pricking sensation value of Example 1 in which starch, vinyl acetate and cowpea protein are added is the lowest, indicating that the plush rigidity is the smallest and the fabric softness is the best. The possible reason is that the copolymerization of vinyl acetate and starch enhances the softness of the fiber, and constructs a protruding structure on the surface of the polyester fiber, which is beneficial to the grafting of the hydrophilic groups of the modified cowpea protein. The polyester fiber is firmly wrapped by the highly hydrophilic hydrophilic particles to form a protruding structure, which has a good softness effect on the polyester fiber and grafts the hydrophilic groups, giving the coral fleece fabric softness and hygroscopic properties; on the other hand, the fiber has a large moisture absorption capacity, and the coral fleece fabric has a high regain, which further reduces the bending rigidity of the polyester fiber. Therefore, the softness of the coral fleece fabric of Example 4 without grafting modified cowpea protein will be slightly worse than that of Example 1, the fiber rigidity is slightly larger, and the pricking sensation is a little higher.

[0092] Test Example 2

[0093] Fabric moisture absorption performance test: Since the moisture absorption capacity of textile materials is different in different states, fabrics are generally characterized by moisture content.

[0094] Test equipment: Y802 eight-basket constant temperature oven.

[0095] Test standard: For the test of the moisture absorption performance of coral fleece fabric, refer to GB / T 9995-1997 "Determination of moisture content and regain of textile materials-Oven drying method" and pre-humidify for 24 hours at a temperature of 20±2℃ and a relative humidity of 65±2%. Each sample is tested three times and the average value of the three experiments is taken. The test data is shown in Table 2.

[0096] The calculation formula for moisture regain is:

[0097] W=(G-G0) / G0×100%

[0098] Where: W——moisture regain / %;

[0099] G——water content of sample / g;

[0100] G0——dry weight of sample / g.

[0101] Table 2: Test results of fabric moisture absorption performance

[0102] Experimental protocol Moisture regain / % Example 1 9.29 Example 2 8.91 Example 3 7.31 Example 4 6.22 Comparative Example 1 5.60

[0103] The test results of the fabric moisture absorption performance show that Example 1 with the addition of starch, vinyl acetate and cowpea protein has the highest regain. The main reason is that vinyl acetate and starch are copolymerized to graft some hydrophilic groups, and the constructed protruding structure provides new grafting sites, which is conducive to the grafting of modified cowpea protein onto the fiber. A large number of hydrophilic groups are grafted onto the fiber surface, which enhances the moisture absorption performance of the fabric and improves the wearing comfort.

[0104] Test Example 3

[0105] Anti-linting performance test: The lint on the surface of coral fleece fabric will fall off to a certain extent after friction. Refer to GB / T4802.1-2008 "Determination of pilling properties of textile fabrics Part 1: Circular locus method" test, and use abrasion resistance to characterize the linting rate of this type of fabric. Control the same friction conditions and friction times on the surface of coral fleece fabric, weigh the mass of the sample before and after friction, and use the mass loss rate after friction to measure the anti-linting performance of the sample. The smaller the mass loss rate of the sample, the better the anti-linting performance of the lint.

[0106] Testing instrument: YG522N fabric abrasion testing machine.

[0107] Experimental method: 10 circular rings (125mm in diameter) were cut from each sample for testing, a small hole was cut in the middle of the sample, and the hair removal rate was tested under standard atmospheric conditions using the rotary flat grinding method. After 400 frictions, the mass loss rate of each sample, i.e. the hair removal rate, was calculated according to the following formula, and the test results are as follows.

[0108] V=(W-W0) / W0×100%

[0109] Where: V——mass loss rate / %;

[0110] W——mass of fabric before wear / g;

[0111] W0——mass of fabric after wear / g.

[0112] The mass loss rate of the soft and hygroscopic coral fleece fabric prepared by the present invention in the anti-hair loss performance test is all below 2.5%, indicating that the soft and hygroscopic coral fleece fabric of the present invention has good anti-hair loss performance.

Claims

1. A method for preparing soft and hygroscopic coral fleece fabric, characterized in that: The following steps are involved: Step 1, weaving: using polyester ultra-fine low-elastic yarn as base yarn and polyester monofilament as wool yarn, placing the two in a warp knitting machine for weaving to prepare a grey cloth; Step 2, sewing edge: sewing edge treatment is performed on the grey cloth to make single-sided grey cloth; Step 3, pre-forming: the prepared single-sided grey cloth is pre-formed by using a setting machine, and the pre-forming temperature, operating speed and fan speed in the setting machine are controlled to obtain the pre-formed grey cloth; Step 4, raising: drying and raising one side of the predetermined blank fabric in S3 to prepare coral fleece fabric; Step 5, soft and hygroscopic finishing: pre-treat the coral fleece fabric, prepare a soft and hygroscopic finishing agent, and finish the pre-treated coral fleece fabric with the soft and hygroscopic finishing agent; then wash and dry to obtain the modified coral fleece fabric; Step 6, hair sorting: use combing equipment to comb the modified coral fleece fabric, and use a shearing machine to shear the fabric; Step 7, reshaping: reshaping the fabric through a shaping machine to obtain a soft and moisture-absorbing coral fleece fabric; The processing steps of the soft moisture absorption finishing in step 5 are as follows, and the following parts are all parts by weight: S1. At room temperature, 10 to 30 parts of the coral fleece fabric obtained in step 4 are soaked in 70 to 90 parts of a 10 to 30 g / L nitric acid aqueous solution for 10 to 30 min; then the coral fleece fabric is washed with water and dried in an oven at 50 to 80°C for 10 to 50 min to obtain nitro coral fleece fabric; then the nitro coral fleece fabric is immersed in 60 to 100 parts of a 10 to 30 g / L sodium sulfide aqueous solution at 40 to 80°C for 10 to 50 min; then the temperature is raised to 100 to 120°C and soaked for 20 to 40 min; then the fabric is washed with water and dried in an oven at a temperature of 50 to 80°C for 10 to 50 min to obtain pretreated coral fleece fabric; S2, adding 3 to 5 parts of epoxy resin to 90 to 100 parts of water to prepare an epoxy resin aqueous solution, and then adding 2 to 5 parts of tetrabutylammonium bromide to the epoxy resin aqueous solution to prepare a crosslinking agent mixed solution; then adding 10 to 30 parts of epichlorohydrin to the crosslinking agent mixed solution at a rate of 0.5 to 1 mL / min, adjusting the solution water bath temperature to 30 to 50° C., and reacting for 10 to 30 minutes; then adjusting the pH to 8 to 10 with 100 to 300 g / L sodium hydroxide aqueous solution to obtain a mixed solution; S3, 300-400 parts of water, 5-10 parts of starch, 1-2 parts of polyvinyl alcohol, 3-8 parts of 10-30wt% emulsifier MOA-20 aqueous solution and 5-15 parts of 3-5wt% sodium tripolyphosphate buffer solution were mixed and added to a reaction container, the air in the container was discharged, an equal volume of nitrogen was injected, the container temperature was adjusted to 50-70°C, and the reaction was stirred for 0.5-2h; then 10-20 parts of vinyl acetate, 0.1-0.2 parts of methacrylic acid, 0.01-0.1 parts of azobisisobutyronitrile and 8-15 parts of water were configured into a mixture, and the mixture was added dropwise to the reaction container at a dropping speed of 0.1-1mL / min. After the addition was completed, the temperature was raised to 70-80°C, and the reaction was stirred for 4-8h. Finally, the reaction solution was cooled to 15-25°C, and filtered with a 200-300 mesh nylon net to obtain an emulsion; S4, adding 5-10 parts of cowpea protein to 80-100 parts of water, and then adding 100-300 g / L sodium hydroxide aqueous solution to adjust the pH to 8-10 to prepare a cowpea protein solution; adding 7-12 parts of the mixed solution obtained in step S2 and 15-20 parts of the emulsion obtained in step S3 to the cowpea protein solution, stirring at room temperature for 5-15 minutes to obtain a soft hygroscopic finishing agent; then soaking the pretreated coral fleece fabric obtained in S1 in the soft hygroscopic finishing agent, heating to 50-70°C for reaction for 20-40 minutes, and then heating to 90-120°C for reaction for 20-40 minutes; finally, washing the obtained fabric in 100-300 parts of 1-3wt% sodium carbonate aqueous solution for 1-5 times, and then drying in an oven at a temperature of 50-80°C for a drying time of 20-50 minutes to obtain a modified coral fleece fabric.

2. The method for preparing a soft and hygroscopic coral fleece fabric according to claim 1, characterized in that: In the step 1, the polyester ultra-fine low-elastic yarn and the polyester monofilament are calculated by weight: the polyester ultra-fine low-elastic yarn is 30-50 parts, and the polyester monofilament is 50-70 parts; the polyester ultra-fine low-elastic yarn has a linear density of 100-200D, a hole number of 200-400F, and a polyester monofilament linear density of 100-300D; the grey cloth weight is 200-300g / m 2 .

3. The method for preparing a soft and hygroscopic coral fleece fabric according to claim 1, characterized in that: In the step 2, a wool outer seam edge is used, and the seam edge width is 3 to 5 cm.

4. The method for preparing a soft and hygroscopic coral fleece fabric according to claim 1, characterized in that: In step 3, the temperature of the setting machine is 200-240° C., the vehicle speed is 30-40 m / min, and the fan speed is 1200-1600 r / min.

5. The method for preparing a soft and hygroscopic coral fleece fabric according to claim 1, characterized in that: The drying and raising process parameters described in step 4 are as follows: the drying temperature is 225-250° C., the grey cloth travel speed during the drying process is 16-25 m / min; the raising speed is 6-14 m / min, the raising tension is 0.5-2.0%, and the cylinder speed is 60-100 r / min.

6. The method for preparing a soft and hygroscopic coral fleece fabric according to claim 1, characterized in that: The brush feeding speed of the combing equipment in step 6 is 12-15 m / min, and the brush roller speed is 300-380 r / min; the shearing parameters of the shearing machine are: vehicle speed 10-20 m / min, forward speed of the circular knife in the shearing machine 700-1000 r / min, and the remaining hair length is 4-6 mm.

7. The method for preparing a soft and hygroscopic coral fleece fabric according to claim 1, characterized in that: In step 7, the setting temperature of the setting machine is 180-220° C., and the grey cloth speed is 16-25 m / min.

8. A soft and hygroscopic coral fleece fabric, characterized by: The soft and hygroscopic coral fleece fabric is prepared by the preparation method of any one of claims 1 to 7.

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