Near infrared ray prevention fabric and preparation method thereof

Abstract

The near-infrared ray preventing fabric is formed by weaving the near-infrared ray preventing fibers, the near-infrared ray preventing fibers take the synthetic fibers as a matrix, and the near-infrared ray preventing particles are adhered to the surfaces of the synthetic fibers; in the process of producing the near-infrared-ray-preventing fibers, melt spinning is carried out in a spinning channel, when spinning trickles forming synthetic fibers just flow out of a spinneret plate, preheated near-infrared-ray-preventing particles are sprayed to the spinning trickles from the periphery or the center of the spinning trickles, and the near-infrared-ray-preventing particles are made to be attached to the spinning trickles in the early stage of cooling; the anti-near-infrared fiber adopted by the anti-near-infrared fabric prevents the anti-near-infrared particles from possibly blocking the spinning assembly, and the anti-near-infrared fabric adopts the structure that the synthetic fiber is used as a matrix and the anti-near-infrared particles are adhered to the surface of the synthetic fiber, so that the anti-near-infrared effect is achieved, and the anti-near-infrared effect is achieved. The strength of the synthetic fibers cannot be obviously reduced, the quality of the fabric is guaranteed, and a new thought is provided for production of the near-infrared-ray-proof fabric.

Description

Technical Field

[0001] The invention relates to the field of textiles, and in particular to a near-infrared protection fabric and a preparation method thereof. Background Art

[0002] Near infrared is a type of electromagnetic wave. When it irradiates the human body, its energy can be absorbed by the skin and converted into heat energy. Moderate near infrared irradiation can promote blood circulation, improve metabolism, and enhance immunity, but excessive near infrared irradiation may cause problems such as dry skin, dehydration, pigmentation, and lead to problems such as suntan and skin aging. Long-term or high-dose near infrared radiation may cause cell damage and even cause skin burns and even skin cancer. Therefore, in order to protect skin health, long-term or high-dose near infrared irradiation should be avoided. In daily life, the exposure time of near infrared should be minimized, and protective measures should be taken, such as wearing sunglasses, applying sunscreen, and wearing sun-protective clothing, to reduce the adverse effects of near infrared on the human body.

[0003] As people's health awareness increases, sun protection clothing is becoming more and more popular among the public, and new concept sun protection clothing that can block near-infrared rays is also beginning to attract people's attention. At present, sun protection clothing mostly uses thin chemical fiber fabrics with a certain degree of breathability. Advanced sun protection clothing will have a sun protection coating or add sun protection ingredients to the fiber. At present, sun protection clothing with sun protection or near-infrared protection coatings on the surface of the fabric is relatively hard and has poor breathability. The coating will wear out after long-term wearing, and some coatings may also be irritating. In addition, in the process of making synthetic fibers, ultrafine particles that have a near-infrared blocking effect are added to the raw materials of melt spinning. When more ultrafine particles are added to achieve sufficient sun protection or near-infrared protection effects, the strength of the synthetic fiber will be reduced, resulting in broken silk during weaving, deterioration of fabric quality, etc., and the service life of the finished product will be reduced.

[0004] In view of this, it is necessary to provide a near-infrared-proof fabric containing a near-infrared-proof component and having a high strength of synthetic fiber raw materials. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a near-infrared protection fabric and a preparation method thereof in view of the deficiencies in the above-mentioned prior art.

[0006] In order to solve the above technical problems, the present invention provides a near-infrared protection fabric, which is woven with near-infrared protection fibers. The near-infrared protection fibers are based on synthetic fibers, and near-infrared protection particles are adhered to the surface of the synthetic fibers.

[0007] Preferably, the near infrared shielding particles include at least one of antimony tin oxide and antimony oxide, or a mixture of the two.

[0008] Preferably, the particle size of the near infrared shielding particles is 50 to 200 nm.

[0009] Preferably, the synthetic fiber includes at least acrylic, nylon or polyester.

[0010] A method for producing near-infrared-proof fabrics. During the production of the near-infrared-proof fibers, melt spinning is performed in a spinning tunnel. When a spinning stream forming synthetic fibers just flows out from a spinneret, preheated near-infrared-proof particles are sprayed toward the spinning stream from around or at the center of the spinning stream, so that the near-infrared-proof particles adhere to the spinning stream in the early cooling stage.

[0011] Preferably, the temperature of the preheated near-infrared shielding particles is not higher than the temperature of the spinning stream just flowing out from the spinneret.

[0012] Preferably, the temperature of the preheated near-infrared shielding particles is 10° to 30° lower than the temperature of the spinning stream just flowing out of the spinneret.

[0013] Preferably, a plurality of nozzles with adjustable heights are arranged around the spinning stream below the spinneret to uniformly spray out the near-infrared shielding particles from multiple directions.

[0014] Preferably, a negative pressure dust suction device is provided at the outlet of the fiber stream at the bottom of the spinning tunnel to recover free near-infrared shielding particles and to separate some near-infrared shielding particles that are not firmly attached to the surface of the spinning stream from the synthetic fibers.

[0015] Preferably, it also includes a blowing device for blowing the spinning fine flow that is about to be bundled in the spinning channel, and the blowing device is located at the lower inner part of the spinning channel to remove the near-infrared protection particles that are not firmly adhered to the surface of the cooled spinning fine flow.

[0016] The present invention has at least the following beneficial effects: 1. The near-infrared resistant fabric of the present invention adopts synthetic fiber as the matrix, and near-infrared resistant particles are adhered to the surface of the synthetic fiber. This not only avoids the trouble of directly adding more near-infrared resistant particles into the raw materials for synthetic fiber production, mixing them evenly, and re-granulating, but also avoids the blockage of the spinneret assembly caused by the near-infrared resistant particles. More importantly, the structure with synthetic fiber as the matrix and near-infrared resistant particles adhered to the surface of the synthetic fiber can achieve the near-infrared resistant effect without significantly reducing the strength of the synthetic fiber, thereby ensuring the quality of the fabric and providing a new idea for the production of near-infrared resistant fabric.

[0017] 2. Coarser near-infrared shielding particles can be used to prepare finer near-infrared shielding fibers, providing greater options.

[0018] 3. It can be modified based on existing equipment with low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of near-infrared protection fiber during melt spinning in a box.

[0020] Figure 2 It is a detection curve diagram of the transmittance of a fabric to near-infrared rays with a wavelength of 760 nm to 1400 nm.

[0021] Figure 3 It is a detection curve diagram of the near infrared transmittance of 2 fabrics with a wavelength of 760 nm to 1400 nm. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below through examples so that those skilled in the art can implement the invention with reference to the description.

[0023] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0024] The test methods used in the following examples are conventional methods unless otherwise specified. The materials and reagents used in the following examples are all commercially available unless otherwise specified. In the following examples, if no specific conditions are specified, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0025] A near-infrared-proof fabric is woven from near-infrared-proof fibers. The near-infrared-proof fibers use synthetic fibers as a matrix, and near-infrared-proof particles are adhered to the surface of the synthetic fibers.

[0026] The near infrared ray blocking particles include at least one of antimony tin oxide and antimony oxide or a mixture of the two, and zinc oxide or the like may be added as an auxiliary material. Antimony tin oxide and antimony oxide have good near infrared ray absorption effects. For example, adding antimony oxide to the fabric can make the fabric have a certain near infrared ray absorption effect. The higher the antimony oxide content in the fabric, the better the near infrared ray absorption effect.

[0027] The particle size of the near-infrared protection particles is 50 to 200 nm, which has a wide range of particle selection, which is beneficial to reducing costs or enriching the types of near-infrared protection particles that can be selected. However, for fibers that are spun by directly mixing the near-infrared protection particles with masterbatches, the maximum particle size of the near-infrared protection particles is generally not greater than 1 / 2 of the diameter of the single fiber, which has high requirements for the raw materials of the near-infrared protection particles and is not conducive to reducing costs.

[0028] The synthetic fibers include acrylic, nylon or polyester.

[0029] A method for producing near-infrared-proof fabrics. In the process of producing the near-infrared-proof fibers, melt spinning is carried out in a spinning tunnel 7. When a spinning stream 3 (a bundle of filaments flowing out of a spinneret, which forms synthetic fibers after being bundled) for forming synthetic fibers just flows out of a spinneret 2, preheated near-infrared-proof particles are sprayed toward the spinning stream 3 from around or at the center of the spinning stream, so that the near-infrared-proof particles adhere to the spinning stream in the early stage of cooling. It is worth mentioning that in the processing method of spraying anti-near-infrared particles on the surface of the filaments and making them adhere before the spinning stream is cooled, if the anti-near-infrared particles are in the form of flakes or rods, the particles are arranged on the surface of the filaments more tending to contact the filament surface with the side of the particle with a larger surface area, that is, the flake-shaped particles are more in contact with the filament surface with the plane part (the plane of the flake-shaped particles is parallel to the length direction of the filament), and the rod-shaped particles are more in contact with the filament surface with the side part (the length direction of the rod-shaped particles is parallel to the length direction of the filament). In this way, the arrangement of the anti-near-infrared particles on the surface of the filaments has better consistency and has a larger shielding area in the direction perpendicular to the length of the filaments (or synthetic fibers), and a better anti-near-infrared effect can be achieved with less anti-near-infrared particles.

[0030] In this embodiment, the preheated near-infrared protection particles are sprayed from the surroundings of the spinning stream to the spinning stream 3. Furthermore, as another embodiment, a nozzle can be set in the middle of the spinneret 2 to spray the preheated near-infrared protection particles from the inside to the outside of the spinning stream.

[0031] The temperature of the preheated near-infrared ray shielding particles is not higher than the temperature of the spinning stream 3 just flowing out from the spinneret. Preferably, the temperature of the preheated near-infrared ray shielding particles is 10° to 30° lower than the temperature of the spinning stream 3 just flowing out from the spinneret 2, and the preheated near-infrared ray shielding particles can adhere to the surface of the spinning stream 3 more and more easily.

[0032] A plurality of nozzles 4 with adjustable heights are arranged around the spinning stream below the spinneret 2 to uniformly eject near-infrared-shielding particles from multiple directions. The lower the spinning stream is, the lower the temperature is, and the less the near-infrared-shielding particles are adsorbed and fixed. The nozzle height can be adjusted according to the required near-infrared-shielding particles.

[0033] A negative pressure dust suction device 5 is provided at the outlet of the fiber stream at the bottom of the spinning tunnel 7 to recover free near-infrared-proof particles and to separate some of the near-infrared-proof particles that are not firmly attached to the surface of the spinning stream from the synthetic fiber. It also includes a blowing device 6 for blowing the spinning stream that is about to be bundled in the spinning tunnel 7, and the blowing device 6 is located at the lower inner part of the spinning tunnel to remove the near-infrared-proof particles that are not firmly attached to the surface of the cooled spinning stream. The blowing device 6 and the negative pressure dust suction device 5 can better recycle the unused near-infrared-proof particles, reduce costs, prevent the near-infrared-proof particles from escaping into the air and polluting the workshop air, and can also effectively reduce the powder loss of the produced near-infrared-proof fibers or fabrics.

[0034] In this embodiment, the synthetic fiber is made of polyester material, and the near-infrared protection particles are made of ultrafine antimony oxide powder with a particle size of 50 to 100 nm.

[0035] like Figure 1 As shown, a nozzle 4 and a blowing device 6 are installed in the box 1 of the spinning machine. The height of the nozzle 4 can be adjusted up and down. When the nozzle sprays out the near-infrared protection particles, the initial spraying velocity does not exceed 0.5m / s to prevent obvious damage to the spinning flow; a negative pressure dust suction device 5 is arranged at the bottom of the outer side of the box 1. The masterbatch is put into the screw extruder to melt and then flows out through the spinneret and enters the spinning channel 7 in the box to cool. After being bundled at the outlet at the bottom of the box, the near-infrared protection fiber is obtained through the processes of wire guiding and winding.

[0036] During melt spinning, a normal spinning process is adopted, the spinning temperature is 280°C, the blowing temperature inside the spinning tunnel is 25°~35°, the spinneret specification is Φ0.25mm×400 holes, the preheating temperature of the near-infrared protection particles is 260°, the blowing speed is 0.3~0.5m / s, and the near-infrared protection particles sprayed into the box body increase the side blowing air volume required for cooling to a certain extent, but the setting of the blowing device can make up for the lack of side blowing air volume, so there is no need or only a small adjustment of the side blowing air volume.

[0037] After the spinning stream is bundled at the bottom of the spinning tunnel, the near-infrared-proof particles adhere to the surface of the synthetic fiber filaments or are sandwiched between the synthetic fiber filaments, thereby completing the fixation of the near-infrared-proof particles on the synthetic fiber and obtaining the near-infrared-proof fiber. It is worth noting that the fabric made of near-infrared-proof fiber has an upper limit on the content of near-infrared-proof particles. During use, it is inevitable that some powder will fall off after repeated washing and rubbing, thereby reducing the infrared-proof performance. Therefore, the near-infrared-proof fabric should avoid excessive rubbing when using and washing.

[0038] Specifically, Figure 2As shown in the figure (the horizontal axis is the near infrared wavelength, the vertical axis is the near infrared transmittance, near infrared transmittance (%) = 100 - near infrared rejection rate), the weight is 49g / m 2 , the antimony oxide content is estimated to be about 6% (other auxiliary materials are not excluded), the polyester material is made in Japan and the near-infrared protection fabric (fabric 1), using GTTC / GF TM 091-2022 (GTTC test method), the test fabric 1 has a near-infrared blocking rate (front) of 74.26% for wavelengths of 760 nm to 1400 nm; Figure 3 As shown, the fabric (fabric 2) made of the near-infrared protection fiber produced by the fiber of the present invention has a gram weight of 48.5 g / m 2 , antimony oxide content is about 5.7%, and the GTTC / GF TM 091-2022 (GTTC test method) is used to test the fabric's near-infrared blocking rate (front) for wavelengths of 760 nm to 1400 nm to be 71.59%. In comparison, the anti-near-infrared performance of fabric 2 of the present invention is slightly inferior, but the fabric tensile strength and fabric tearing strength of fabric 2 of the present invention are significantly better than those of fabric 1.

[0039] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A near-infrared-proof fabric, woven from near-infrared-proof fibers, characterized in that: The near infrared ray preventing fiber is based on synthetic fiber, and near infrared ray preventing particles are adhered to the surface of the synthetic fiber.

2. The near infrared ray protection fabric according to claim 1, characterized in that: The near infrared shielding particles include at least one of antimony tin oxide and antimony oxide, or a mixture of the two.

3. The near infrared ray protection fabric according to claim 2, characterized in that: The particle size of the near infrared ray shielding particles is 50 to 200 nm.

4. The near infrared protection fabric according to claim 1, characterized in that: The synthetic fiber at least includes acrylic fiber, nylon or polyester.

5. A method for producing the near-infrared protection fabric according to claim 1, characterized in that: During the production of the near-infrared-proof fiber, melt spinning is carried out in a spinning tunnel. When the spinning stream forming the synthetic fiber just flows out from the spinneret, preheated near-infrared-proof particles are sprayed toward the spinning stream from the periphery or center of the spinning stream, so that the near-infrared-proof particles adhere to the spinning stream in the early stage of cooling.

6. The method for producing near infrared ray protection fabric according to claim 5, characterized in that: The temperature of the preheated near-infrared shielding particles is not higher than the temperature of the spinning stream just flowing out from the spinneret.

7. The method for producing near infrared ray protection fabric according to claim 6, characterized in that: The temperature of the preheated near-infrared shielding particles is 10° to 30° lower than the temperature of the spinning stream just flowing out of the spinneret.

8. The method for producing near-infrared ray-proof fabric according to claim 5, characterized in that: A plurality of nozzles with adjustable heights are arranged around the spinning stream below the spinneret to uniformly spray out near infrared ray protection particles from multiple directions.

9. The method for producing near-infrared ray-proof fabric according to claim 8, characterized in that: A negative pressure dust suction device is arranged at the outlet of the fiber fine flow at the bottom of the spinning tunnel to recover the free near-infrared ray-proof particles and to separate some of the near-infrared ray-proof particles that are not firmly attached to the surface of the spinning fine flow from the synthetic fiber.

10. The method for producing near infrared ray shielding fabric according to claim 9, characterized in that: It also includes a blowing device for blowing the spinning fine flow that is about to be bundled in the spinning channel, and the blowing device is located at the lower inner part of the spinning channel to remove the near-infrared protection particles that are not firmly adhered to the surface of the cooled spinning fine flow.

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