Elastic warp knitting fabric

Abstract

The invention discloses an elastic warp knitting fabric. The fabric is composed of spandex fibers and polyamide fibers, the content of the spandex fibers is 10-30% by weight, a resin film 1 containing a polyamide polymer component is attached to the surface of the polyamide fibers, and a resin film 2 containing a hydrophilic polyurethane polymer component is attached to the surface of the spandex fibers. The fabric has the advantages of good elasticity, good dimensional stability, excellent water absorption and washing durability, and is especially suitable for producing underwear, coats, trousers and other products.

Description

Technical Field

[0001] The present invention belongs to the field of textiles and relates to an elastic warp knitted fabric. Background Art

[0002] Polyamide fibers have good moisture absorption and abrasion resistance, and the clothing fabrics woven therefrom have always been deeply loved by consumers. With the increasing improvement of living standards, people hope that the clothing fabrics containing polyamide fibers can have a certain elasticity to obtain a better wearing experience.

[0003] For this reason, people have conducted continuous research. For example, Chinese Patent Document CN110791976A discloses a highly elastic polyamide fiber fabric and its durable water-absorbing dyeing and finishing process. The content of spandex filaments in the fabric is between 5 and 30% by weight, or the proportion of high-elastic yarn is above 10% by weight. It uses polydimethylsiloxane resin to obtain good water absorption, but the affinity between polydimethylsiloxane resin and polyamide fibers and spandex fibers is relatively low, and the combination of the two is not firm, resulting in poor washing durability.

[0004] Another example is that Chinese Patent Document CN111719316A discloses a highly water-absorbent fiber structure, specifically discloses a resin film containing component A with hydrophilic groups, component B with strong adhesion ability, and component C with a bridging effect is covered on the fiber surface by coating, endowing the fiber structure with good water absorption, but the resin film obtained by coating processing is prone to breakage after multiple washes, affecting the washing durability. Summary of the Invention

[0005] The purpose of the present invention is to provide an elastic warp knitted fabric with good water absorption, excellent washing durability and good dimensional stability.

[0006] The technical solution of the present invention is as follows:

[0007] An elastic warp knitted fabric is composed of spandex fibers and polyamide fibers, wherein the content of spandex fibers is 10-30% by weight, and a resin film 1 containing a polyamide polymer component is attached to the surface of the polyamide fibers, and a resin film 2 containing a hydrophilic polyurethane polymer component is attached to the surface of the spandex fibers.

[0008] The fabric of the present invention is knitted by warp knitting organization, has good dimensional stability, and at the same time the fabric contains a specific amount of spandex fibers, endowing the fabric with excellent elasticity, and specific resin films are attached to the surface of the polyamide fibers and the surface of the spandex fibers respectively. The obtained fabric not only has excellent water absorption performance, but also has excellent washing durability, and can be used for producing products such as underwear, coats, and trousers. Detailed Embodiments

[0009] The elastic warp knitted fabric of the present invention has no special limitation on the warp knitted structure and can be selected according to actual needs. Examples include chain stitch structure, plain stitch structure, satin stitch structure, double warp structure, rib plain stitch structure, etc. Considering the good dimensional stability of the fabric, the preferred structures are one or more of chain stitch structure, plain stitch structure, and satin stitch structure.

[0010] The elastic warp knitted fabric of the present invention is composed of spandex fiber and polyamide fiber. Among them, the spandex fiber is in the form of filament, and the form of the polyamide fiber has no special limitation and can be filament or staple fiber. In the elastic warp knitted fabric, the content of spandex fiber is 10-30% by weight. This is considered because within the above range, the fabric has good elasticity. If the spandex content of the fabric is less than 10% by weight, the elasticity of the fabric is too low; when the spandex content is higher than 30% by weight, on the one hand, there is a problem of difficult fabric weaving, and on the other hand, during the processing of the grey fabric, the amino group in the spandex is easily damaged during hot processing (such as high-temperature processing like setting and dyeing), that is, the spandex fiber is easily broken, and if the spandex content is too high, the elasticity of the fabric will be affected.

[0011] In the elastic warp knitted fabric of the present invention, a resin film 1 containing polyamide polymer components is attached to the surface of the polyamide fiber. The hydrophilic chain segments in the polyamide polymer have a strong affinity for water molecules, enabling water to spread rapidly, and endowing the polyamide fiber with excellent hydrophilicity. The polyamide chain segments in the polyamide polymer have a similar structure to the macromolecules of the polyamide fiber, that is, both have a -CONH- structure. According to the principle of "like dissolves like", the polyamide chain segments and the polyamide fiber are intertwined with each other and crystallize together. The polyamide polymer is anchored on the fiber through van der Waals forces and hydrogen bond interactions, improving the water absorption and washing durability of the elastic warp knitted fabric.

[0012] In the elastic warp knitted fabric of the present invention, a resin film 2 containing hydrophilic polyurethane polymer components is attached to the surface of the spandex fiber. The hydrophilic chain segments in the hydrophilic polyurethane polymer have a strong affinity for water molecules, endowing the spandex fiber with excellent hydrophilicity. Among them, the polyurethane chain segments in the hydrophilic polyurethane polymer have a similar structure to the macromolecules of the spandex fiber, that is, both have a -NH-COO- structure, and are combined with the spandex fiber through van der Waals forces and hydrogen bond interactions, attaching to the surface of the fabric to form a hydrophilic thin film, endowing the fabric with excellent water absorption and washing durability. Moreover, polyurethane substances have good film-forming properties and strong adhesion ability, and the formed resin film has excellent adhesion to the fabric, capable of endowing the fabric with excellent washing durability.

[0013] Preferably, in the present invention, the polyamide polymer component is one or more of polyacrylamide copolymer, polyether-polyamide block copolymer, polysiloxane-polyamide block copolymer, polysiloxane-polyether-polyamide block copolymer, and polyamide-polyether-silicone terpolymer. This is because these copolymers can endow the fabric with excellent water absorption. Specifically, the polyacrylamide copolymer contains hydrophilic groups such as hydroxyl and carboxyl groups. As a hydrophilic component, it has a good effect on improving the moisture absorption and moisture transmission ability of the fabric. At the same time, it can undergo a polymerization reaction on the polyamide fiber to form a hydrophilic resin film, endowing the fabric with very excellent water absorption and washing durability. The polyether-polyamide block copolymer can adhere to the polyamide fiber through van der Waals forces and hydrogen bond interactions. The polyether segment in it has strong polarity and a large affinity for water molecules, improving the hydrophilicity of the fabric, enabling water to spread quickly, and endowing the fabric with very excellent water absorption. The polyamide segment has a large binding force with the fiber, endowing the fabric with excellent washing durability. For the polysiloxane-polyamide block copolymer and the polysiloxane-polyether-polyamide block copolymer, the polysiloxane segment contains hydrophilic groups, which can endow the fabric with excellent water absorption; the polyamide segment can bind to the polyamide fiber through van der Waals forces and hydrogen bond interactions, endowing the fabric with excellent washing durability. In addition, the polysiloxane segment forms a dense and smooth film on the fiber surface, which can significantly reduce the friction coefficient between the fibers and improve the softness and smoothness of the fabric. For the polyamide-polyether-silicone terpolymer, the silicone soft segment therein destroys the regularity of the polyamide-polyether copolymer macromolecule, reduces the crystallinity of the copolymer, improves the solubility of the copolymer, and is conducive to the formation of a more uniform and continuous hydrophilic thin film on the fabric surface, endowing the fabric with excellent water absorption and washing durability.

[0014] Preferably, the oil content of the elastic warp knitted fabric of the present invention is 0.5 to 1.5% by weight. This is because the oil agent on the fabric affects the water absorption of the fabric. A lower oil content of the fabric results in better water absorption. When weaving a fabric with a higher content of spandex fibers, since spandex fibers have high elasticity and a large friction coefficient, more silicone lubricants need to be added during the spinning process compared to conventional fibers (such as synthetic fibers like polyester fibers and polyamide fibers). Therefore, a large amount of oil agent is often contained in its grey fabric. If the oil agent in the grey fabric cannot be well removed during subsequent processing, problems such as uneven dyeing may occur during dyeing. Moreover, when the oil agent content of the fabric is high, the water absorption of the fabric tends to deteriorate, easily leading to discontinuity of the film formed by hydrophilic substances adhering to the fabric surface, affecting water absorption and washing durability. For the grey fabric of the present invention, in the pretreatment process, the preferred components of the agent are a refining degreasing agent composed of a surfactant and ethylene glycol ether, considering that this agent has excellent removal and emulsification effects on the silicone spinning oil agent from spandex. The dosage of the agent is preferably 0.5 to 3 g / L. When the dosage is less than 0.5 g / L, the removal effect of the oil agent is not ideal; when the dosage exceeds 3 g / L, the agent foams more, and it is difficult to completely wash away the residual agent in the subsequent washing process.

[0015] Preferably, the porosity of the elastic warp knitted fabric of the present invention is 0 to 3%. When the porosity is low, the fabric structure is dense, and there may be a problem of poor water absorption. However, when the porosity is low, the fabric has a better tendency for dimensional stability. The fabric of the present invention contains a relatively high content of spandex fibers. Spandex fibers have good resilience and can be woven together with polyamide fibers to obtain a relatively tight fabric. Moreover, warp knitting structures such as tricot stitch, plain stitch, or satin stitch are used. During weaving, there are many contact points of the yarn loops, the fabric structure is dense, the porosity is small, the extensibility of the fabric is small, and the dimensional stability is good. If the porosity of the fabric is greater than 3%, the fabric is relatively loose, and the dimensional stability tends to deteriorate, and there are problems of easy deformation during production and wearing. In addition, the problem of poor water absorption that may be caused by low porosity can be improved by attaching a resin film with specific components to the surfaces of polyamide fibers and spandex fibers in the present invention, obtaining an elastic warp knitted fabric with excellent water absorption, washing durability, and dimensional stability.

[0016] Preferably, for the elastic warp knitted fabric of the present invention, when tested according to the drop method of JIS L 1907:2010, the initial water absorption of the fabric is within 3 s. The smaller the water absorption value, the better the water absorption.

[0017] Preferably, for the elastic warp knitted fabric of the present invention, after washing 50 times according to the method of JIS L 0217 103:1995 and then tested according to the drop method of JIS L 1907:2010, the water absorption of the fabric is within 3 s.

[0018] The elastic warp knitted fabric of the present invention has no particular limitation on its manufacturing method and can be obtained by the following method:

[0019] Select a warp knitted grey fabric with a spandex fiber content of 10-30% by weight and process it according to the following process: pre-setting (190°C × 1 min) → pretreatment → dyeing process → padding process → finishing setting.

[0020] Among them, the pretreatment conditions are as follows: the chemicals used are a refining and degreasing agent (composition: surfactant and ethylene glycol ether) 0.5-3 g / L, sodium carbonate 0.5 g / L, and the bath ratio is 1:50. Treat at a temperature of 80-90°C for 20-30 minutes, then wash continuously twice at 80°C for 15-20 minutes, finally wash with normal temperature water until clean, and dry at a temperature of 60-80°C.

[0021] The dyeing process conditions are as follows: treat at a temperature of 95-98°C for 30-40 minutes, then dry at a temperature of 60-80°C. The dye is an acid dye (dosage 4-6% o.w.f), the dyeing acid is 2 g / L, the leveling agent is 1 g / L, and the bath ratio is 1:20. According to needs, a resin finishing solution containing a polyamide polymer can be added in the same bath during dyeing, with a dosage of 2-4% o.w.f.

[0022] The padding process conditions: use a resin finishing solution containing a polyamide polymer and a polyurethane polymer for padding, which can be one-padding-one-rolling or two-padding-two-rolling. Control the liquor pickup rate to be 40-60% by weight, and finally heat-treat at a temperature of 110-130°C for 2-5 minutes. One-padding-one-rolling processing is preferred.

[0023] Within the scope not affecting the purpose of the present invention, dyes, auxiliaries, and other functional resins can also be added during the processing according to the usage requirements.

[0024] The present invention will be further described below in conjunction with examples and comparative examples.

[0025] The test methods for the various parameters involved in the present invention are as follows:

[0026] (1) Determination of the fiber content in the fabric

[0027] a. Qualitative analysis of the fibers in the fabric

[0028] Refer to the standard FZ / T 01057.4-2007 "Textile Fiber Identification Test Method".

[0029] First, dissolve some of the fibers in the fabric to be tested with a 20% hydrochloric acid solution and observe under a microscope. If the dissolved part of the yarn is round-headed, then the fabric contains polyamide fibers. Then, dissolve the remaining fibers with N,N-dimethylformamide. If the remaining fibers can be completely dissolved, then all the remaining fibers are spandex fibers.

[0030] After determining that the fabric to be tested is composed of spandex fibers and polyamide fibers, perform the following steps to measure the fiber content.

[0031] b. Determination of spandex fiber content

[0032] According to the provisions in the standard GB / T 38015-2019 "Textiles - Quantitative chemical analysis - Mixtures of spandex and certain other fibers (method using 20% hydrochloric acid)", analyze the content of spandex fibers.

[0033] c. Determination of polyamide fiber content

[0034] According to the provisions in the standard GB / T 2910.7-2009 "Textiles - Quantitative chemical analysis - Part 7: Mixtures of polyamide fibers and certain other fibers (method using formic acid)", analyze the content of polyamide fibers.

[0035] (2) Qualitative analysis of resin components

[0036] a. Resin on polyamide fibers

[0037] Refer to the provisions in the standard GB / T 38015-2019 "Textiles - Quantitative chemical analysis - Mixtures of spandex and certain other fibers (method using dimethylformamide)". Dissolve the spandex fibers, filter the residue into a glass sand core funnel, evacuate and drain the liquid, wash the residue with water into a crucible, evacuate and drain the liquid, and dry. The resulting residual fabric is the polyamide fiber fabric.

[0038] Take 1 piece of the obtained polyamide fiber fabric and cut it into 2 g of powder to increase the area of liquid immersion. Then, place the powder in a filter paper sleeve and place it in an extraction chamber. Use chloroform as the extractant. When the solvent containing the powder boils, the vapor rises through the gas pipe and is condensed into a liquid and drips into the extractor. When the liquid level exceeds the highest point of the siphon tube, a siphon phenomenon occurs, and the solution flows back into the flask, and the substances soluble in the solvent can be extracted. Drop the extract into a methanol solution to precipitate solids, and dissolve and precipitate the sample 3 - 5 times to obtain a purified solid sample.

[0039] Take 1 - 2 mg of the purified solid sample and mix it with 200 mg of dried potassium bromide, then press it into a film and use an infrared spectrometer to measure the infrared spectrum. Different chemical bonds or functional groups will show different absorption peaks on the infrared spectrum due to different absorption frequencies, so as to determine the specific components of the resin attached to the polyamide fiber. The infrared spectrum has absorption peaks at 1702 cm -1 、3265 cm -1 、1458 cm -1 and 810 cm -1 respectively, which belong to the absorption vibration peak of the carbonyl group (C=O) in the amide bond and the stretching vibration peak, angular vibration peak and bending vibration peak of the secondary amine (N―H). Then it is determined that there is a polyamide polymer attached to the fabric.

[0040] In addition to the above absorption peaks, there are also absorption peaks at 1406 cm -1 and 1559 cm -1 , then it is determined that there is a polyacrylamide copolymer attached to the fabric; the infrared spectrum has absorption peaks at 1091 cm -1 、1252 cm -1 、2969 cm -1 、1351 cm -1 respectively, which belong to the absorption vibration peaks of CH 2 -O-CH 2 and -CH 2 CH 2 - in the polyether segment and the absorption vibration peak of -CH 2 - in the polyether segment. Then it is determined that there is a polyether segment structure in the resin and a polyether-polyamide block copolymer is attached to the fabric.

[0041] Absorption peaks appear at 1269 cm -1 、1099 cm -1 、1020 cm -1 、790 cm -1 (which belong to the characteristic absorption peaks of Si-CH 3 、Si-O-Si、Si-CH3、Si-CH2- respectively), then it is determined that there is a polysiloxane-polyamide copolymer attached to the fabric. The infrared spectrum has absorption peaks at 1269 cm -1 、1099 cm -1 、1020 cm -1 、790 cm -1 (which belong to the characteristic absorption peaks of Si-CH 3 、Si-O-Si、Si-CH 3 、Si-CH 2 - respectively), 2969 cm -1 、1351 cm -1An absorption peak appears (the absorption vibration peak of ―CH 2 ― in the polyether chain segment), then it is determined that the fabric is attached with a polysiloxane-polyether-polyamide block copolymer. The infrared spectrum shows absorption peaks at 2962.49 cm -1 , 1405.66 cm -1 and 839.88 cm -1 (the stretching vibration, symmetric deformation vibration of the methyl -CH 3 on Si in the organosilicon chain segment of the copolymer, and the stretching vibration absorption peak of the Si-(-CH 3 ) 2 bond), and an absorption peak at 1030.73 cm -1 (the overlapping absorption peak of -Si-O-Si- in the organosilicon soft chain segment), then it is determined that the fabric is attached with a polyamide-polyether-tertiary organosilicon polymer.

[0042] b. Resin components on spandex fibers

[0043] Referring to the provisions in the standard GB / T 38015-2019 "Textiles - Quantitative chemical analysis - Mixtures of spandex and certain other fibers (method using 20% hydrochloric acid)", the polyamide fibers in the fabric to be tested are dissolved, then dried and cooled, and the obtained fabric is the spandex fabric.

[0044] Take any 1 piece of the obtained spandex fabric and cut it into 2 g of powder to increase the area of liquid immersion. Then place the powder in a filter paper sleeve and place it in an extraction chamber. Use cyclohexanone as the extractant. When the solvent containing the powder boils, the steam rises through the gas guide tube and is condensed into liquid and drops into the extractor. When the liquid level exceeds the highest point of the siphon tube, the siphon phenomenon occurs, and the solution flows back into the flask, and the substances soluble in the solvent can be extracted. Drop the extract into the chloroform solution to precipitate solids, and dissolve and precipitate the sample 3 - 5 times in a cycle to obtain a purified solid sample.

[0045] Take 1 - 2 mg of the purified solid sample and mix it with 200 mg of dried potassium bromide, then press it into a film, and use an infrared spectrometer to measure the infrared spectrum. The infrared spectrum shows absorption peaks at 3330 cm -1 , 1530 cm -1 (the stretching vibration peak and deformation vibration peak of N-H), absorption peaks at 1710 - 1730 cm -1 (the C=O vibration peak), an absorption peak at 1170 cm -1 (the stretching vibration peak of C-O in the ester group), and an absorption peak at 2940 cm -1 (the stretching vibration peak of CH 2 ), and based on this, it is determined that the fabric is attached with a hydrophilic polyurethane polymer.

[0046] (3) Determination of oil content

[0047] According to GB / T 6504-2017 standard "Test method for oil content of chemical fibers - Extraction method (Method A)".

[0048] (4) Porosity measurement

[0049] Place the fabric to be tested flat on the stage, observe it with a digital microscope (model WHX-2000) at 50x magnification, adjust the focus until the clear pore edge can be seen and take a photo. Use the image processing software that comes with the equipment to extract the photo, the white part is the pore part, the black part is the fiber part, and calculate the proportion of the white part, which is the porosity of the fabric.

[0050] (5) Water absorption

[0051] According to JIS L 1907:2010 standard "Test method for water absorption of textile products (drop method)"

[0052] (6) Washing method

[0053] According to JIS L 0217 103:1995, hang to dry after washing.

[0054] (8) Elasticity (elongation and elongation recovery)

[0055] The elongation was measured according to JIS L 1096:2010D method (constant speed and constant load method).

[0056] The elongation recovery was measured according to JIS L 1096:2010E method (constant speed and constant load method).

[0057] (9) Dimensional stability

[0058] The dimensional change rate was evaluated by JIS L 1096G method. The smaller the dimensional change rate result, the better the dimensional stability.

[0059] The present invention is further described below in conjunction with embodiments and comparative examples, but the embodiments of the present invention are not limited thereto.

[0060] The structural formula of the medicament used in the following examples is as follows:

[0061] Agent A: The main component is polyether polyamide block copolymer, trade name RX300E, manufactured by Keihin Chemical Co., Ltd.

[0062] Agent B: The main component is a hydrophilic polyurethane polymer, the trade name is RUCO-PUR SEC, manufactured by Rudolf Chemical (Dongguan) Co., Ltd.

[0063] Agent C: The main component is polyamide-polyester-polyether block copolymer, with the trade name MST, manufactured by Duoen Biotechnology Co., Ltd.

[0064] Agent D: The main component is polysiloxane-polyether-polyamide block copolymer, with the trade name hydrophilic softening finishing agent PSED, manufactured by Shaanxi Gaohua Zhiben Chemical Technology Co., Ltd.

[0065] Agent E: Refining and degreasing agent (the main components are surfactant and ethylene glycol ether), with the trade name 583, manufactured by Nantong JiongYi Printing and Dyeing Auxiliary Co., Ltd.

[0066] Example 1

[0067] Select a warp-knitted grey fabric woven from 40D / 24f polyamide 6 (Ny6) FDY fiber and 40D spandex (PU) bare yarn. Among them, the content of Ny6 fiber is 80% by weight, the content of PU fiber is 20% by weight, and the texture is warp-knit texture. Then, finish and process the grey fabric, including pre-setting (190°C * 1 min) → scouring (90°C * 30 min, Agent E 0.5 g / L) → washing twice (80°C * 15 min) → dyeing + in-bath processing (98°C * 40 min, acid black dye Bestalan Black SF-S 6% o.w.f, dyeing acid 2 g / L, leveling agent 1 g / L, Agent A 3% o.w.f) → color fixing (80°C * 20 min, anionic color fixing agent TEN-3640H 3% o.w.f, acetic acid 0.5 g / L) → resin processing (padding once and squeezing, the expression rate is 50 ± 5%) → finishing setting (130°C * 2 min). Among them, in-bath processing is carried out simultaneously during dyeing, and the agent for in-bath processing is Agent A, with a dosage of 3% o.w.f, to obtain the elastic warp-knitted fabric of the present invention.

[0068] Among them, the composition of the resin processing solution is as follows:

[0069] Agent A 30 g / L

[0070] Agent B 15 g / L

[0071] The rest is soft water.

[0072] Example 2

[0073] Select a warp-knitted grey fabric woven from 40D / 24f polyamide 6 (Ny6) FDY fiber and 40D spandex (PU) bare yarn. Among them, the content of Ny6 fiber is 90% by weight, the content of PU fiber is 10% by weight, and the rest is the same as in Example 1, to obtain the elastic warp-knitted fabric of the present invention. The test results of various properties are shown in Table 1.

[0074] Example 3

[0075] Replace agent A with agent D, and the rest is the same as in Example 2, to obtain the elastic warp-knitted fabric of the present invention. The results of various performance tests are shown in Table 1.

[0076] Example 4

[0077] Select a warp-knitted grey fabric woven from 40D / 24f polyamide 6 (Ny6) FDY fiber and 40D spandex (PU) bare yarn. Among them, the content of Ny6 fiber is 70% by weight, and the content of PU fiber is 30% by weight. The rest is the same as in Example 1, to obtain the elastic warp-knitted fabric of the present invention. The results of various performance tests are shown in Table 1.

[0078] Example 5

[0079] Replace agent A with agent C, and the rest is the same as in Example 1, to obtain the elastic warp-knitted fabric of the present invention. The results of various performance tests are shown in Table 1.

[0080] Example 6

[0081] Adjust the dosage of the refining degreasing agent (agent E) from 2 g / L to 3 g / L, and replace agent A with agent D. The rest is the same as in Example 1, to obtain the elastic warp-knitted fabric of the present invention. The results of various performance tests are shown in Table 1.

[0082] Example 7

[0083] Adjust the dosage of the refining degreasing agent (agent E) from 2 g / L to 0.5 g / L, and the rest is the same as in Example 1, to obtain the elastic warp-knitted fabric of the present invention. The results of various performance tests are shown in Table 1.

[0084] Comparative Example 1

[0085] Select a warp-knitted grey fabric woven from 40D / 24f polyamide 6 (Ny6) FDY fiber and 40D spandex (PU) bare yarn. Among them, the content of Ny6 fiber is 95% by weight, and the content of PU fiber is 5% by weight. The rest is the same as in Example 1, to obtain a fabric. The results of various performance tests are shown in Table 1.

[0086] Comparative Example 2

[0087] Perform padding treatment with 25 g / L of agent A, and the rest is the same as in Example 1, to obtain a fabric. The results of various performance tests are shown in Table 1.

[0088] Table 1

[0089]

[0090] According to Table 1,

[0091] (1) As can be seen from Example 5 and Example 1, under the same conditions, compared with the elastic warp knitted fabric with a resin film 1 containing a polyamide-polyester-polyether block copolymer component attached to the surface of polyamide fibers, the water absorbency of the former (after 50 washes) is inferior to that of the latter, and the water absorbency (before washing), dimensional change rate, elongation rate, and elongation recovery rate of the two are comparable.

[0092] (2) As can be seen from Comparative Example 1 and Example 2, under the same conditions, compared with the elastic warp knitted fabric with a 5 wt% spandex fiber content, the dimensional change rate, elongation rate, and elongation recovery rate of the elastic warp knitted fabric with a 10 wt% spandex fiber content are all inferior to those of the latter, and the water absorbency of the two is comparable.

[0093] (3) As can be seen from Comparative Example 2 and Example 1, under the same conditions, compared with the elastic warp knitted fabric with a resin film 1 containing only a polyether-polyamide block copolymer component, the water absorbency of the former is far less than that of the latter when compared with the elastic warp knitted fabric with a resin film 1 containing a polyether-polyamide block copolymer component and a resin film 2 containing a hydrophilic polyurethane polymer component.

Claims

1. An elastic warp-knitted fabric, composed of spandex fiber and polyamide fiber, wherein the spandex fiber content is 10 to 30% by weight. Characterized in that: A resin film 1 containing a polyamide polymer component is attached to the surface of the polyamide fiber, and a resin film 2 containing a hydrophilic polyurethane polymer component is attached to the surface of the spandex fiber.

2. The elastic warp-knitted fabric according to claim 1. Characterized in that: The polyamide polymer component is one or more of polyacrylamide copolymer, polyether-polyamide block copolymer, polysiloxane-polyamide block copolymer, polysiloxane-polyether-polyamide block copolymer, and polyamide-polyether-silicone terpolymer.

3. The elastic warp-knitted fabric according to claim 1 or 2. Characterized in that: The oil content of the fabric is 0.5 to 1.5% by weight.

4. The elastic warp-knitted fabric according to claim 1 or 2. Characterized in that: The porosity of the fabric is 0 to 3%.

5. The elastic warp-knitted fabric according to any one of claims 1 to 4. Characterized in that: Tested according to the drop method of JIS L 1907:2010, the initial water absorbency of the fabric is within 3 s.

6. The elastic warp-knitted fabric according to any one of claims 1 to 4. Characterized in that: Washed 50 times according to the method of JIS L 0217 103:1995 and then tested according to the drop method of JIS L 1907:2010, the water absorbency of the fabric is within 3 s.

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