WO2021093825A1 - Fabric - Google Patents

Abstract

A fabric, the difference in color when the fabric is dry and when wet being determined, according to visual inspection, to be at grade 4 or above; being wet refers to a state in which 0.2 ml of water is dropped on the surface of the fabric and the water spreads until fully absorbed by the fabric. Since the color of the wet surface changes little, no significant sweat stains or water stains will be formed. Moreover, the fabric has good washing durability, can be knit and woven in any weave and at any thickness, and can be widely used to make shirts, coats, windbreakers, sports T-shirts, mountaineering clothes, and so on.

Description

A fabric Technical field

The invention relates to a fabric, in particular to a fabric that is not prone to perspiration or water stains after sweating or moistening.

Background technique

In the hot summer or after running, golf and other sports, the armpits, back and other parts of the clothes are prone to sweat stains; in addition, on rainy days, water stains are prone to appear on the clothes that are exposed to rain. These sweat and water stains The appearance of stains is often embarrassing. In order to solve this problem, people have conducted a lot of research.

For example, Japanese Patent Laid-Open No. 2011-226001 discloses an anti-sweat fabric and anti-sweat clothing. The anti-sweat fabric is formed of polyester fiber, one side is attached with a waterproofing agent, and the other side has a concave-convex structure, which has excellent anti-perspiration. However, this technical solution with a water-repellent attached to the surface of the fiber has a limited anti-perspiration effect, and there are also problems in the durability of washing, and this processing method is not suitable for light and thin fabrics or Elastic fabrics are prone to the problem that the water repellent penetrates to the other side and causes the water absorption to decrease.

For another example, Japanese Patent Publication No. 2015-86489 discloses an impermeable fabric and a fiber product. The anti-perspiration fabric is composed of a non-waterproof fiber A and a waterproof fiber B. Fiber A and fiber B The weight ratio of the fiber B is 1:99-49:51, the fiber B is a water-repellent polyester fiber false-twisted yarn with a torque of 30T/m or less obtained after processing with a water-repellent resin, and the fiber B is arranged on the surface of the fabric, The fabric is also processed with water-absorbent resin, which has both water absorption and water resistance, has the effect of preventing permeation of sweat, and has excellent washing durability. However, since the surface of the fiber is only attached with a water-repellent agent, there is still limited anti-perspiration effect. The problem.

Summary of the invention

The purpose of the present invention is to provide a fabric with good water absorption, excellent anti-perspiration or water stain effect and excellent washing durability.

The color difference between the dry state and the wet state of the fabric of the present invention is judged to be level 4 or higher according to the visual method; wherein the wet state means that 0.2ml of water is dropped on the surface of the fabric, and the water diffuses to a state where it is completely absorbed by the fabric .

The fabric of the present invention, even after being completely wetted by rain or sweat, the surface color change relative to the dry state can reach level 4 or more, the effect of preventing sweat or water stains is extremely superior, and the washing durability is good. The invention can be any organization, any thick or thin knitted fabric and woven fabric, and can be widely used to make shirts, coats, down jackets, sports T-shirts, mountaineering clothes and the like.

Detailed ways

As we all know, when light shines on the fabric in a dry state, part of the light does not enter the fiber but is diffusely reflected. The diffusely reflected light is white reflected light; and the other light enters the fiber. Some of the light is absorbed by the fiber and reflected from the other side of the fiber again. This part of the light is colored reflected light related to the color of the dye on the fiber. The light that enters the human eye is the mixed light of the above white reflected light and colored reflected light, dry In the state, because the white reflected light is more, the fabric looks light in color. When the fabric is wet, the fiber fluff can't reflect light effectively and the surface of the wet area is covered with water molecules, so the light enters the fiber more easily, and the white reflected light from the surface is greatly reduced, and it is reflected again when it enters the fiber. More colored reflected light comes out, and this mixed light effect makes the fabric look darker than the dry state. The same fabric, in the dry state, the fabric has a large light reflectivity and the fabric is light in color; in the wet state, the fabric has a low light reflectivity and the fabric has a darker color. When the reflectance difference between the dry state and the wet state accounts for more than 8% of the total visible light, the color difference is obvious, and the color difference is less than 4 by visual inspection, and it is easy to see sweat stains, water stains and other phenomena. When the percentage of poor reflectivity is less than or equal to 8%, the fabric has the effect of preventing sweat stains or water stains.

Compared with the dry state of the fabric of the present invention, the color difference between the wet state and the dry state is visually evaluated as 4 or more. The dry state here refers to the state after the sample is placed in the standard atmospheric pressure for 24 hours after the humidity is adjusted and balanced. The wet state here refers to the state when the sample is placed in the standard atmospheric pressure for 24 hours after the humidity is adjusted and balanced, and 0.2ml of water is dropped on the surface of the sample, and the water diffuses until it is completely absorbed by the fabric (no obvious liquid droplets, that is, when there is no specular reflection) .

Preferably, the surface yarn of the fabric of the present invention contains inorganic particles. The surface yarn contains inorganic particles. The inorganic particles can exist inside the fibers of the surface yarn, or the inorganic particles can exist outside the fibers of the surface yarn by means of padding resin or coating resin, or the above two types. The combination of methods makes inorganic particles exist both inside and outside the fibers of the surface yarn. The type of resin used for the padding resin or coating resin is not particularly limited, as long as it can adhere inorganic particles to the fibers, and examples thereof include isocyanate resins, acrylate resins, urethane resins, and silicone resins. In the present invention, it is preferable that the inorganic particles exist inside the fibers of the surface yarn, and it is more preferable that the inorganic particles exist both inside and outside the fibers of the surface yarn.

The surface yarn here refers to the yarn located on the surface of the fabric. In the single-layer structure, all the yarns forming the fabric are called surface yarns. In the case of double or more layers, the yarn forming the surface structure of the fabric is the surface yarn. When the fabric of the present invention is a woven fabric, its weave is not particularly limited, such as plain weave, twill weave, satin weave, etc., and it can also be a multi-weave fabric. When the fabric of the present invention is a knitted fabric, its structure is not particularly limited, and it may be a circular knitted fabric, a flat knit fabric, or a warp knitted fabric. The weaves of circular knit fabrics and flat knitting fabrics can be plain weave, rib weave, double rib weave, double reverse weave, tuck weave, and the like. The warp knitted fabric can be a single comb warp warp weave, a single comb warp satin weave, a double comb warp warp weave, a double comb warp warp-warp weave, and the like. For example, for woven fabrics, the warp and weft of plain weave, twill and satin weave are surface yarns, and the surface warp and surface weft of double warp, weft, double or multi-layer weaves are called surface yarns. line. For knitted fabrics, in single-sided weave, all yarns are surface yarns, and in double-sided weaves, surface yarns are surface yarns.

The inorganic particles contained in the surface of the fabric can not only absorb the light entering the fiber, but also scatter the light in different directions. The light scattered inside the fiber absorbs relatively little color due to the change of the path, and finally refracts it. After the fabric is reflected light-colored light, that is, the presence of inorganic particles makes part of the colored light-reflective light light-colored reflected light. After the fabric is wet, the white light reflected on the surface is reduced, but because the ratio of light-colored reflected light in the colored reflected light is large, compared with the fabric without inorganic particles, the degree of light reflection decline is small, and the degree of color darkening is small. The effect of sweat or water stains. When the surface yarn of the fabric contains less than 2.0% by weight of inorganic particles, the light reflectivity will decrease more after wetting, the color change will be more obvious compared with the dry state, and the anti-perspiration or water stain effect will decrease; when the surface yarn contains When the amount of inorganic particles exceeds 25.0% by weight, the particles may agglomerate in the resin layer or the yarn strength may decrease. Therefore, in the present invention, it is preferable that the inorganic particles account for 2.0-25.0% by weight of the surface yarn, and it is more preferable that the inorganic particles account for 2.0-25.0% by weight of the surface yarn. 3.0 to 20.0% by weight of the surface yarn, more preferably, the inorganic particles account for 5.0 to 15.0% by weight of the surface yarn.

In the present invention, the presence of inorganic particles inside the fibers of the surface yarn can be obtained by adding inorganic particles at the polymerization stage. For specific use, one type of yarn with the content of inorganic particles in the above range can be selected, or two or more yarns with the content of inorganic particles in the above range but different content can be selected, or the content of inorganic particles can be selected in the above range. The yarns are arranged with yarns whose content is not in the above-mentioned range, and there is no particular limitation, as long as the purpose of preventing sweat or water stains can be achieved, and it can be selected and used according to needs. In the present invention, when inorganic particles exist outside the fibers of the surface yarn, the surface yarn may or may not contain inorganic particles inside the fibers. When the fiber contains inorganic particles, the content is not particularly required, and may be in the above range or not in the above range, as long as it can achieve the purpose of preventing sweat or water stains.

The type of inorganic particles here is not particularly limited, and can be selected according to needs, such as titanium dioxide (anatase type or rutile type), barium sulfate, ferric oxide, barium chloride, silicon oxide, barium oxide, barium titanate, One of cadmium red, cadmium yellow, carbon (such as carbon black, graphite, etc.), chromium oxide, silicon oxide green, copper oxide, ferrous oxide, aluminum oxide, antimony trisulfide, zirconium dioxide, calcium oxide, etc. Kind or more. Among them, titanium dioxide has a good light scattering effect, and has good safety, stability, and dispersibility characteristics, so it is preferred. The inorganic particles here may be white particles or colored particles such as red and blue.

The refractive index of common fibers is between 1.4 and 1.8. When the refractive index of inorganic particles is close to the refractive index of the fiber, it may affect the reflection and scattering effects of the inorganic particles on the incident light, and the effect of preventing sweat or water stains will be reduced. trend. As the refractive index of inorganic particles increases, the reflection and scattering effects of light also increase. However, when the refractive index reaches a certain value, the upward trend gradually tends to be flat. In the present invention, the refractive index of inorganic particles is preferably 1.8～3.5. .

In addition, when the average particle size of the inorganic particles is less than 0.05 μm, the particles may agglomerate and reduce the dispersibility. When the average particle size is higher than 3.00 μm, the inorganic particles may block the spinning filter. Therefore, in the present invention, it is preferable that the inorganic particles are fine particles having an average particle diameter of 0.05 to 3.00 μm. In view of the best reflection effect on light, in the present invention, the inorganic particles are more preferably fine particles with an average particle diameter of 0.20 to 1.80 μm, and more preferably inorganic particles are fine particles with an average particle diameter of 0.20 to 0.60 μm.

The fiber raw material of the yarn used in the present invention is not particularly limited, and examples thereof include polyester (PET), polyamide, viscose, and the like. The cross-sectional shape of the fiber is also not particularly limited, and it may be a circular cross-section, or a special-shaped cross-section such as a triangle, a cross, a multilobal, a flat, and an H-shape.

When the inorganic particles are present inside the fibers of the surface yarn, the surface yarn may be a single-component fiber or a multi-component composite fiber, and is preferably a composite fiber. Among them, the composite fiber can be in a composite form such as a core sheath, sea island, and laminate. Such a composite form can maximize the content of titanium dioxide. For example, in the core-sheath structure, inorganic particles are mainly concentrated in the core, which is good for weaving and can reduce the friction of the yarn on the healds and reeds. Another example is the sea-island structure. Inorganic particles are mainly concentrated on the islands and are more evenly distributed inside the fiber. Another example is the layered structure, that is, the multilayer composite structure. The inorganic particles are mainly concentrated in the middle layer, compared to the core-sheath structure. Under the condition of containing the same weight% of inorganic particles, the layered structure has better light reflection effect, so it is more preferable.

In the process of manufacturing the fabric of the present invention, if the inorganic particles are white particles, dyes of any color can be used for dyeing; if the inorganic particles are colored particles such as red and blue, it is best to choose dyes of the same color as the particles. dyeing. In addition, water absorbing agents, water repellents, softeners, etc. can be selected for processing in post-finishing as required. These agents may be commercially available products or self-prepared products, and the types are not particularly limited. Among them, the water absorbing agent can be exemplified by polyester resins and acrylic resins, and the water repellent can be exemplified by fluorocarbon resins and hydrocarbon resins. Examples of the softener include silicone resins and the like.

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

The test methods of the various parameters involved in the present invention are as follows:

(1) Color difference (visual method)

Cut 10 pieces of 10 cm×10 cm samples that are flat and wrinkle-free, and place them in an environment with a temperature of 20° C. and a humidity of 65% to adjust the humidity for 24 hours to obtain a sample in a dry state. Take two pieces for the color difference grading test, place one of the dry samples on the test platform, and then use a burette to suck in an appropriate amount of third-grade water, and place 0.2ml of water at the place where the burette is no more than 1cm away from the surface of the sample. Gently drop on the surface of the sample. The water droplets touch the surface of the sample until they are completely diffused and absorbed (no obvious liquid water droplets, that is, when there is no specular reflection). After 2 minutes, a wet sample is obtained, and it is tested with another piece of dry state. The gray card is also placed on the same plane. Refer to GB T 250-2008 textile color difference evaluation. Choose D65 light source for color matching. The angle between the incident light and the sample surface is about 45°, the observation direction is perpendicular to the surface of the sample, and the color difference of two samples is visually evaluated by the level difference of the five-level gray card. When the color difference of the two samples is equivalent to the color difference of the appearance of a certain level of the gray card, it is regarded as The number of color differences. When there is no visual color difference, it is set as level 5. If the color difference of two samples is between two adjacent levels of the gray card, it can be set as an intermediate level, such as 4-5 and 3-4. According to the same method, the remaining 8 samples were subjected to a grading test, and a total of 5 sets of data were obtained, and the average value was taken as the color difference of the present invention.

(2) Proportion of poor reflectivity

Cut 5 pieces of 10cm×10cm samples that are flat and unwrinkled, and place them in an environment with a temperature of 20°C and a humidity of 65% to adjust the humidity for 24 hours to obtain a sample in a dry state. Take one of the samples for the test. First use an ultraviolet spectrophotometer to obtain the sum of the reflectances of the dried samples in the range of visible light wavelengths from 380nm to 780nm and record them as A, and then flatten the dried samples. Place it on the test platform, and then use a burette to suck in an appropriate amount of tertiary water, and gently drop 0.2ml of water on the surface of the sample at the point where the mouth of the burette is no more than 1cm away from the surface of the sample. (No obvious liquid droplets, that is, when there is no specular reflection), get a wet sample after 2 minutes, and then use an ultraviolet spectrophotometer to obtain the reflection of each wavelength of the wet sample in the visible light wavelength range of 380nm to 780nm The sum of the rates is recorded as B, and the total amount of light in the range of visible light wavelength from 380nm to 780nm is C. According to the following formula, calculate the proportion of the difference in reflectance, the proportion of the difference in reflectance = [(AB)/C]×100 %. The remaining 4 samples were tested in the same way, and a total of 5 sets of data were obtained, and the average value was taken as the proportion of the reflectance difference of the present invention.

(3) Refractive index of inorganic particles

a. Extract inorganic particles

When inorganic particles exist outside the fiber of the surface yarn, the infrared spectrum of the surface yarn is measured by the infrared spectrum analyzer FT-IR method, and the type of resin on the fiber is determined according to the position of the characteristic peak. For example, if ^{two characteristic peaks appear at 2275-2250 cm -1} and ^{1400-1350 cm -1} , it is determined that the isocyanate resin is attached to the fiber. If, 1250cm ^-1 and 1170cm ^-1 which three characteristic peaks occur at 1730cm ^-1, 1170cm ^-1 and 1250cm ^-1 peak is greater than the peak, it is determined that an acrylic resin adhered to the fibers. If two characteristic peaks appear at 3330 cm ^-1 and 1538 cm ^-1 , it is judged that the urethane resin is attached to the fiber. Then take 100 g of the surface yarn, and select an appropriate solvent X according to the type of resin adhering to the fiber to dissolve these resins to obtain inorganic particles existing on the outside of the fiber. Examples of the solvent X include toluene, acetone, butyl acrylate, N,N-dimethylformamide, hexafluoroisopropanol, carbon tetrachloride and the like. Specifically, acetone solvent is used for polyurethane resin, a mixed solution of toluene and butyl acrylate is used for acrylate resin, and toluene solvent is used for isocyanate resin;

When the inorganic particles are present inside the fibers of the surface yarn, 100 g of the surface yarn is taken, and a suitable solvent Y is selected to dissolve the fibers, and after drying, the inorganic particles present inside the fibers are obtained. The solvent Y here is selected according to the type of fiber. For example, a mixed solution of phenol and tetrachloroethylene is used for polyester fiber, formic acid is used for polyamide fiber, and concentrated sulfuric acid is used for viscose fiber.

When inorganic particles exist inside and outside the fibers of the surface yarn, solvent X is used to dissolve the resin outside the fibers, and then solvent Y is used to dissolve the fibers to obtain inorganic particles inside and outside the fibers.

b. Determine the refractive index

Take about 10g of surface yarn and melt it to prepare a sample. First, determine the metal elements in the X-ray fluorescence spectrometer (manufacturer: Rigaku, model: ZSX PrimusⅢ+) and infer the molecular formula, then determine the type of inorganic particles based on the molecular formula. The refractive index is determined according to the type of inorganic particles. When the inorganic particles have the same elements but different structures, such as anatase titanium dioxide and rutile titanium dioxide, the XRD pattern is obtained by an X-ray diffractometer, and then the specific type of inorganic particle is judged according to the XRD pattern, and finally the refraction is determined according to the type of inorganic particle rate. The refractive index of the inorganic particles that can be listed is shown in the following table:

Inorganic particles	Refractive index	Inorganic particles	Refractive index
Anatase Titanium Dioxide	2.49～2.56	Separate red	2.64～2.77
Rutile Titanium Dioxide	2.62～2.90	Cadmium Yellow	2.35～2.48
Barium sulfate	1.64～1.65	Carbon (carbon black, graphite)	2.42
Ferric oxide	3.01	Chromium oxide	2.55
Barium chloride	1.64	Silica Green	2.50
Silica	1.65	Copper oxide	2.63
Barium oxide	1.98	Ferrous oxide	2.32
Barium titanate	2.40	Aluminum oxide	1.76～1.77
Antimony trisulfide	2.65	zirconium dioxide	2.19
Calcium Oxide	1.84	To	To

(4) The particle size of inorganic particles

Cut a 5cm*5cm sample, use a scanning electron microscope SEM to observe the cross section of the sample at 3000 magnification, randomly select 10 inorganic particles on the cross section and use the SEM's own measurement software to obtain the diameter of each particle. A total of 5 cross-sections are measured in the same way to obtain 50 sets of data, and the average value is taken as the average particle size of the inorganic particles of the present invention.

(5) The content of inorganic particles in the surface yarn

①Boil the crucible with hydrochloric acid (1:4) for 1 to 2 hours, wash and dry; place it in a high-temperature furnace at 500-550°C for 1 hour; move it to the furnace mouth and cool to about 200°C before moving it in In the desiccator, after cooling to room temperature, accurately weigh; then put the cooled crucible into a high temperature furnace and burn for 30 minutes, take it out, cool and weigh, until the constant weight is recorded as m1 (the difference between the two weighings does not exceed 0.5 mg. If it exceeds 0.5 mg, continue to burn in a high-temperature furnace). The division value of the analytical balance is 0.0001g/division.

② Decompose 10g surface yarn from the fabric as a sample, then put the 10g sample into the crucible and accurately weigh it and record it as m2.

③First heat the crucible with a small electric furnace to make the sample fully carbonized to smokeless, then place it in a high-temperature furnace for 4 hours, take out the crucible and let it cool to below 200℃, then put it in a desiccator to cool to room temperature for 40 minutes, weigh and record. Put it into the high-temperature furnace again and continue burning for 30 minutes, take it out, cool it, and weigh it as m3 (the difference between the two weighings does not exceed 0.5mg. If it exceeds 0.5mg, continue to burn it in the high-temperature furnace). Then calculate the proportion of ash as the content of inorganic particles in the surface yarn according to the following formula. Calculated as follows:

Ash content (%)=【(m3-m1)/(m2-m1)】×100%

Where: m1 is the mass of the empty crucible (g);

m2 is the mass of the sample plus empty crucible (g);

m3 is the mass of residual ash plus empty crucible (g).

④ Repeat the above steps ① to ③, measure 3 sets of samples in total, obtain 3 sets of data and take the average value as the content of inorganic particles in the surface yarn in the present invention.

(6) Washing

Wash 30 times in accordance with JIS L1930 C4M (2014).

(7) The compound ratio of each component of the composite fiber

Use the scanning electron microscope SEM to take a picture of the cross-section of the composite fiber, print the picture on the paper, cut the pictures of the cross-sections of different components, respectively weigh the total weight of each component of the printing paper, and then calculate the total weight of each component The weight ratio is the compound ratio between the components. A total of 3 sets of samples are measured, and 3 sets of data are obtained and the average value is taken as the composite ratio of each component of the composite fiber of the present invention.

(8) Water absorption on the reverse side

According to JIS L 1907:2010 standard.

Example 1

The 75D/36f core-sheath composite fiber is selected, and the weft plain needle weave is knitted to obtain a grey fabric with a vertical and horizontal density of 48*72 pieces/inch. The obtained grey fabric was refined and dyed with blue dye (made by DyStar, dosage of 2.5owf%), and then processed with polyester water-absorbing resin (made by Shanghai Rihua Company, dosage of 5g/L), and finally at 160℃. After styling for 1 minute, a fabric with a grammage of 120 g/m ² of the present invention is obtained, and the specific parameters are shown in Table 1.

Among them, the core of the core-sheath composite fiber is PET containing 15.0% by weight of white titanium dioxide particles (refractive index 2.76, average particle size 0.4μm), and the sheath is containing 2.65% by weight of white titanium dioxide particles (refractive index 2.55, average particle size 0.4 μm) PET, the core-sheath composite ratio is 4:1.

Example 2

The sheath of the core-sheath composite fiber is a PET component containing 0.3% by weight of white titanium dioxide particles, and the core-sheath composite ratio is 1:1. The rest is the same as in Example 1. ^{The fabric of the invention with a grammage of 125g/m 2} is obtained. Its specific parameters See Table 1.

Example 3

Replace the 75D/36f core-sheath composite fiber with 75D/36f island-in-the-sea composite fiber. Among them, the sea component of the island-in-the-sea composite fiber is CO-PET, and the island component contains 15.0% by weight of white titanium dioxide particles (refractive index 2.55, average particle size). 0.4μm) insoluble PET, the sea-island composite ratio is 1:1, and the rest is the same as in Example 1. ^{The fabric of the present invention with a grammage of 121 g/m 2} is obtained. The specific parameters are shown in Table 1.

Example 4

Replace the 75D/36f core-sheath composite fiber with the 75D/36f laminated cross-section fiber. The cross-section is a three-layer structure, from the outside to the inside, the outer layer, the middle layer, and the inner layer. All three layers contain white titanium dioxide particles (refracting With a rate of 2.55 and an average particle size of 0.4μm), the content of titanium dioxide particles in the intermediate layer is 15.0% by weight, and the proportion of the intermediate layer on the entire section is 50%. The content of titanium dioxide particles in the outer layer and the inner layer is both 0.3% by weight, and the rest is the same as in Example 1, to obtain ^{a fabric with a grammage of 123/m 2} according to the present invention. See Table 1 for specific parameters.

Example 5

Replace the 75D/36f core-sheath composite fiber with the 75D/36f circular section PET DTY. The circular section PET DTY contains 28.0% by weight of white titanium dioxide particles (refractive index 2.55, average particle size 0.4μm), and the rest As in Example 1, a fabric with a grammage of 125 g/m ² of the present invention was obtained, and the specific parameters are shown in Table 1.

Example 6

The warp yarn is 50D/36f laminated cross-section composite fiber, and the weft yarn is 75D/72f circular cross-section PET DTY, 2/1 twill weave, and the warp and weft density is 155*140 strands/inch. The laminated cross-section composite fiber The cross-section is a three-layer structure, from the outside to the inside, the outer layer, the middle layer, and the inner layer. The three layers are all PET containing white titanium dioxide particles (refractive index 2.55, average particle size 0.4μm). The content of titanium dioxide particles in the middle layer is 13.6% by weight and the intermediate layer accounts for 25% of the entire cross section. The content of titanium dioxide particles in the outer layer and the inner layer are both 0.3% by weight. The circular section PET DTY contains 0.3% by weight of white titanium dioxide particles (refractive index 2.55, the average particle size is 0.4 μm), and the rest are the same as in Example 1. ^{The fabric of the invention with a grammage of 115 g/m 2} is obtained. The specific parameters are shown in Table 1.

Example 7

The content of titanium dioxide particles in the intermediate layer is 30.0% by weight and the proportion of the intermediate layer on the entire cross section is 70%. The rest is the same as in Example 4 to obtain ^{a fabric with a grammage of 123 g/m 2} of the present invention. The specific parameters are shown in Table 1.

Example 8

The core of the core-sheath composite fiber is PET containing 15.0% by weight white barium sulfate particles (refractive index 1.64, average particle size 0.3μm), and the sheath is containing 2.65% by weight white titanium dioxide particles (refractive index 2.55, average particle size 0.3μm) ) PET, the rest are the same as in Example 1, to obtain ^{a fabric with a grammage of 125 g/m 2} according to the present invention. The specific parameters are shown in Table 1.

Example 9

The core of the core-sheath composite fiber is PET containing 15.0% by weight of white titanium dioxide particles (refractive index 2.76, average particle size 0.3μm), and the sheath is containing 2.65% by weight of white titanium dioxide particles (refractive index 2.55, average particle size 0.3μm) The rest of the PET is the same as in Example 1, to obtain ^{a fabric with a grammage of 125 g/m 2} according to the present invention. The specific parameters are shown in Table 1.

Example 10

The core of the core-sheath composite fiber is a PET containing 15.0% by weight of red iron oxide particles (refractive index 3.01, an average particle size of 0.3μm), and the sheath is a PET containing 2.65% by weight of white titanium dioxide particles (refractive index of 2.55, average particle size) 0.3 μm) PET was dyed with red dye (made by Destar Company, dosage 2.0owf%), and the rest was the same as in Example 1, to obtain ^{a fabric with a grammage of 125 g/m 2} of the present invention. See Table 1 for specific parameters.

Example 11

The core-sheath composite fiber of 75D/36f is selected. The core of the core-sheath composite fiber is PET containing 15.0% by weight of white titanium dioxide particles (refractive index 2.76, average particle size 1.0μm), and the sheath is containing 2.65% by weight of white titanium dioxide. The PET with particles (refractive index 2.55, average particle diameter 1.0 μm) has a core-sheath composite ratio of 4:1, and the rest is the same as in Example 1, to obtain ^{a fabric with a grammage of 125 g/m 2} of the present invention. The specific parameters are shown in Table 1.

Example 12

The content of titanium dioxide particles in the intermediate layer is 15.0% by weight, and the rest is the same as in Example 6, to obtain ^{a fabric with a grammage of 130 g/m 2} of the present invention. The specific parameters are shown in Table 1.

Example 13

The grey cloth of Example 2 was selected after scouring and dyeing with blue dye (manufactured by DyStar, the amount of 2.5owf%), and then padding titanium dioxide particles (refractive index 2.55, average particle size 0.4μm) aqueous dispersion and acrylic acid ester The mixed solution of linking agent, the amount of inorganic particle aqueous dispersion (50% solid content) is 300g/L, the amount of acrylate crosslinking agent is 10g/L, the rolling rate is 80%, and then it is dried at 130°C , And finally set the shape at 170°C to obtain ^{a fabric with a gram weight of 128g/m 2.} The specific parameters are shown in Table 1.

Example 14

Replace the 75D/36f core-sheath composite fiber with 75D/36f circular section PET DTY. Among them, the circular section PET DTY contains 0.3% by weight of white titanium dioxide particles (refractive index 2.55, average particle size 0.4μm), and the rest As in Example 13, a fabric with a grammage of 128 g/m ² was obtained, and the specific parameters are shown in Table 1.

Comparative example 1

Replace the 75D/36f core-sheath composite fiber with the 75D/36f circular section PET DTY. The circular section PET DTY contains 0.3% by weight of white titanium dioxide particles (refractive index 2.55, average particle size 0.4μm). The water-absorbent resin processing is adjusted to use C6 waterproof resin for surface water-repellent processing, and the rest is the same as in Example 1, to obtain ^{a fabric with a gram weight of 123 g/m 2.} The specific parameters are shown in Table 1.

Table 1

According to Table 1,

(1) It can be seen from Example 1 and Example 2 that under the same conditions, the fabric with a titanium dioxide particle content of 12.5% by weight in the top yarn is compared with the fabric with a titanium dioxide particle content of 7.7% by weight in the top yarn. The performance is similar, but the color change on the surface of the former is smaller than that of the latter, that is, the former has better anti-perspiration or water stains than the latter.

(2) It can be seen from Example 4 and Example 2 that under the same conditions, the fabric using laminated cross-section fibers has the same water absorption on the reverse side as the fabric using core-sheath composite fibers, but the color change on the surface of the former is smaller than that of the fabric using core-sheath composite fibers. The latter, that is, the former is better than the latter in preventing perspiration or water stains.

(3) It can be seen from Example 7 and Example 5 that under the same conditions, the fabric with 21.2% by weight of titanium dioxide particles in the top yarn has the water absorption on the opposite side of the fabric with 28.0% by weight of titanium dioxide particles in the top yarn. The performance is equivalent, and the color change of the former is smaller than the latter, that is, the former has better anti-perspiration or water stains than the latter.

(4) It can be seen from Example 1 and Example 8 that under the same conditions, the fabric obtained by using the yarn containing titanium dioxide particles has the same water absorption on the reverse side as compared with the fabric obtained by using the yarn containing barium sulfate particles. However, the color change on the surface of the former is smaller than that of the latter, that is, the former has better anti-perspiration or water stains than the latter.

(5) It can be seen from Example 12 and Example 6 that under the same conditions, the fabric with a titanium dioxide particle content of 3.8% by weight in the top yarn and the fabric with a titanium dioxide particle content of 1.9% by weight in the top yarn absorb water on the reverse side of the fabric. The performance of the former is equivalent, and the color change of the former is smaller than the latter, that is, the former has better anti-perspiration or water stains than the latter.

(6) It can be seen from Comparative Example 1 and Example 14 that under the same conditions, the content of titanium dioxide particles in the surface yarn is 0.3% by weight and the single-sided waterproof resin is processed. The content of titanium dioxide particles in the surface yarn is 12.3% by weight. Compared with the fabrics processed by water-absorbent resin, although the initial color changes of the two are the same, the washing durability of the former is worse than that of the latter, and the water absorption of the reverse side of the former is very poor.

Claims (3)

1. A fabric, characterized in that: the color difference between the dry state and the wet state of the fabric is judged to be 4 or more according to the visual method; wherein the wet state means that 0.2ml of water is dropped on the surface of the fabric, and the water spreads. Until it is completely absorbed by the fabric.
2. The fabric according to claim 1, wherein the surface yarns of the fabric contain inorganic particles, and the inorganic particles account for 2.0-25.0% by weight of the surface yarns.
3. The fabric according to claim 2, wherein the refractive index of the inorganic particles is 1.8 to 3.5, and the average particle size is 0.05 to 3.00 μm.