Light-shading and heat-insulating curtain fabric and preparation method thereof

Abstract

The invention provides a shading and heat-insulating curtain fabric and a preparation method thereof. The preparation method comprises the following steps: S1, mixing nano titanium dioxide, zirconium carbide and polyester chips, carrying out melt spinning through a twin-screw extruder, cooling, and carrying out plasma treatment to obtain shading reflective yarns; s2, the silicon dioxide aerogel fibers are soaked in a polyurethane solution to be subjected to dip coating and curing, and aerogel core-spun yarn is obtained; s3, mixing the phase change microcapsules with polypropylene slices, and performing wet spinning and stretching to obtain phase change energy storage yarns; s4, weaving is conducted in a three-layer jacquard spaced weaving mode, then vacuum impregnation and gradient heat treatment are conducted in sequence, and the shading and heat insulation curtain fabric is obtained. The shading and heat-insulating curtain fabric prepared by the invention can reflect and absorb light in the wave band of 400-2500nm, has the surface density of less than or equal to 150g / m < 2 >, is light in weight and high in thermal resistance value, and is free of attenuation and emission of organic gas after being cleaned for 50 times.

Description

Technical Field

[0001] The invention relates to the technical field of curtain fabrics, in particular to a light-shielding and heat-insulating curtain fabric and a preparation method thereof. Background Art

[0002] With the increasing demand for energy conservation in modern buildings and people's increasing requirements for indoor environmental comfort, curtains, as an indispensable part of home decoration, have expanded their functions from traditional decoration and privacy protection to the field of light and heat environment regulation. As a typical representative of functional textiles, light-shielding and heat-insulating curtains must simultaneously meet multiple requirements such as efficient light-shielding, heat-blocking, lightweight and aesthetics. Such curtains can not only reduce air conditioning energy consumption in summer and reduce heat loss in winter, but also improve indoor visual comfort by controlling optical fibers.

[0003] Traditional blackout and heat-insulating curtains mostly adopt a "double-layer composite structure" design, with the outer layer usually being a high-density blackout layer and the inner layer being a heat-insulating functional layer. The outer layer is usually made of polyester fiber or blended fabric coated with a sunscreen, achieving a shading rate of more than 90% through physical blocking or chemical absorption; the inner layer uses fibers or non-woven materials with added ceramic particles or metal coatings, using the high reflective properties of the material to block infrared radiation. However, traditional blackout and heat-insulating curtains still have the following defects: 1) The double-layer composite fabric results in a surface density usually higher than 200g / m 2 1) The installation requires a high weighing capacity of the track, and the heavy material affects the folding aesthetics of the curtains; 2) It needs to go through processes such as coating, lamination, and compounding, which increases the production cost by 30-50%, and the solvent coating has the problem of VOC emissions; 3) The blocked light is relatively single.

[0004] Therefore, there is an urgent need for a new light-shielding and heat-insulating curtain fabric that is light in weight, has a wide light-shielding range, and does not emit volatile organic compounds. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a light-shielding and heat-insulating curtain fabric and a preparation method thereof, which solves the problems raised in the above-mentioned background technology through the combination of fiber components and three-dimensional interval weaving technology.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] According to a first aspect of the present invention, there is provided a method for preparing a light-shielding and heat-insulating curtain fabric, comprising the following steps:

[0010] S1, mixing nano titanium dioxide, zirconium carbide and polyester chips, performing melt spinning through a twin-screw extruder, cooling and then performing plasma treatment to obtain a light-shielding reflective yarn;

[0011] S2, dipping the silica aerogel fiber into a polyurethane solution for dip coating, and curing to obtain an aerogel core-covered yarn;

[0012] S3, mixing the phase change microcapsules with polypropylene slices, wet spinning, and stretching to obtain phase change energy storage yarn;

[0013] S4. The shading reflective yarn is used as the surface layer, the aerogel core-wrapped yarn is used as the middle connecting yarn to form a spacing layer, and the phase change energy storage yarn is used as the bottom layer. A three-layer jacquard spacing weaving method is adopted for weaving, and then vacuum impregnation and gradient heat treatment are performed in sequence to obtain the shading and heat-insulating curtain fabric.

[0014] The present application uses a three-layer jacquard interval weaving process to weave shading reflective yarn, aerogel core-covered yarn and phase change energy storage yarn, which can achieve a refractive index of up to 99%, light weight and no pollution.

[0015] Preferably, in step S1, the mass ratio of the nano-titanium dioxide, zirconium carbide and polyester chips is 1:0.3-0.8:7-10.

[0016] In the light-shielding reflective yarn of the present application, nano-titanium dioxide has a reflectivity of more than 95% for visible light in the band of 400-780nm, and zirconium carbide has an absorption rate of more than 90% for near-infrared light in the band of 780-2500nm through lattice vibration. Through the synergistic effect of the two, a wider spectral band can be covered. By setting the mass ratio of nano-titanium dioxide, zirconium carbide and polyester chips within this range, the spinnability of the fiber can be guaranteed and the fiber embrittlement caused by the addition of nanoparticles can be avoided.

[0017] Preferably, in step S1, the twin-screw extruder in the melt spinning process includes three sections, the temperature of the first section is 250-255°C, the temperature of the second section is 265-270°C, and the temperature of the third section is 260-265°C;

[0018] The plasma treatment is carried out in a nitrogen atmosphere with a power of 300-350W.

[0019] Preferably, in step S2, the diameter of the silica aerogel fiber is 10-18 μm, and the porosity is 92-96%;

[0020] The polyurethane concentration in the polyurethane solution is 20-30%, and the solvent is selected from at least one of water, ethanol and N-methylpyrrolidone.

[0021] The present application reduces the thermal conductivity of the aerogel core yarn by impregnating the surface of the silica aerogel fiber with polyurethane, and also improves the elongation at break of the silica aerogel fiber. In addition, the present application adopts a water-based polyurethane system, which reduces VOC emissions while maintaining the integrity of the aerogel core yarn structure.

[0022] Preferably, in step S2, the specific parameters of the curing are: drying under hot air at 70-90°C for 10-15 minutes, and then cross-linking at 120-125°C for 5-10 minutes.

[0023] Preferably, in step S3, the mass ratio of the phase change microcapsules to the polypropylene slices is 1:2.5-4;

[0024] During the wet spinning process, the temperature of the spinning solution is 180-190° C., and the coagulation bath is a NaCl solution with a concentration of 25%;

[0025] The stretching multiple is 3 to 4 times.

[0026] Preferably, in step S4, the parameters of the three-layer jacquard interval weaving are:

[0027] The warp yarn system includes light-shielding reflective yarn and intermediate connecting yarn, and the weft yarn system includes phase-change energy storage yarn and indirect connecting yarn;

[0028] The surface layer adopts twill weave, the warp tension is controlled at 18-22cN, and the weft tension is controlled at 15-18cN;

[0029] The spacer layer is formed by an "8" shaped intermediate connecting yarn, and the weaving heddle height is 1.0-1.5mm;

[0030] The bottom layer adopts plain weave with a warp density of 65 to 75 yarns / cm and a weft density of 60 to 70 yarns / cm.

[0031] This application adopts three-layer jacquard interval weaving to form three kinds of yarns into one body, and a heat-insulating air layer of 1.0 to 1.5 mm is formed in the middle of the weaving. Compared with the traditional weaving process, it is light in weight and has good light-shielding and heat-insulating effects.

[0032] Preferably, in step S4, the vacuum impregnation solution comprises 15-25% aqueous polyurethane, 3-10% nano-silicon dioxide and 65-80% water;

[0033] The vacuum degree of the vacuum impregnation is -0.08 to -0.05 MPa, and the impregnation time is 5 to 10 minutes;

[0034] The gradient heat treatment includes one stage heat treatment, two stage heat treatment and three stage heat treatment, wherein the temperature of the first stage heat treatment is 80-90°C and the time is 5-12 minutes, the temperature of the second stage heat treatment is 130-140°C and the time is 3-5 minutes, and the temperature of the third stage heat treatment is 55-60°C and the time is 1-2 hours.

[0035] The present application uses vacuum impregnation to allow water-based polyurethane and nano-silica to penetrate into the pores of the fabric, fill the gaps between aerogel fibers and the honeycomb structure of the spacing layer, form a dense network, further reduce the thermal conductivity, and improve the tensile strength. Combined with gradient heat treatment, the resin can be cured in stages, promoting the chemical bonding between the polyurethane pre-nano-silica and the fiber matrix, enhancing the interfacial bonding strength, and improving the wash fastness. In addition, the phase change microcapsules can also be protected to avoid leakage.

[0036] According to a second aspect of the present invention, there is provided a light-shielding and heat-insulating curtain fabric obtained according to the above-mentioned preparation method, comprising a light-shielding and reflective surface layer, an aerogel core-spun yarn spacing layer and a phase-change energy storage bottom layer.

[0037] Preferably, the density of the light-shielding reflective surface layer is 120 to 140 strands / cm 2 , wherein the diameter of the light-shielding reflective yarn is 30 to 50 μm;

[0038] The height of the aerogel core-covered yarn spacing layer is 1.0 to 1.2 mm, wherein the diameter of the aerogel core-covered yarn is 20 to 26 mm;

[0039] The diameter of the phase change energy storage yarn in the phase change energy storage bottom layer is 8-10 μm, and the strength is ≥3.2 cN / dtex.

[0040] (III) Beneficial effects

[0041] The present invention provides a light-shielding and heat-insulating curtain fabric and a preparation method thereof, which has the following beneficial effects:

[0042] (1) This scheme provides a method for preparing a light-shielding and heat-insulating curtain fabric. The light-shielding reflective yarn can reflect more than 95% of visible light and absorb more than 90% of near-infrared light. The aerogel core-coated yarn reduces the thermal conductivity. The phase change energy storage yarn realizes dynamic thermal buffering. It is made by three-layer jacquard interval weaving technology, and the surface density is ≤150g / m 2 , light in weight, no attenuation after 50 cleanings, and no emission of organic gases.

[0043] (2) The present invention provides a method for preparing a light-shielding and heat-insulating curtain fabric. Through vacuum impregnation and gradient heat treatment, water-based polyurethane and nano-silica can penetrate into the pores of the fabric, fill the gaps between aerogel fibers and the honeycomb structure of the spacer layer, form a dense network, further reduce the thermal conductivity, and improve the tensile strength. Combined with gradient heat treatment, the resin can be cured in stages, promoting the chemical bonding between polyurethane pre-nano-silica and the fiber matrix, enhancing the interfacial bonding strength, and improving the wash fastness. In addition, the phase change microcapsules can be protected to avoid leakage.

[0044] (3) The scheme provides a light-shielding and heat-insulating curtain fabric that can reflect and absorb light in the wavelength range of 400 to 2500 nm. By combining the aerogel core yarn layer and the phase change energy storage bottom layer, dynamic thermal buffering is achieved, thereby achieving the effects of light-shielding and heat-insulating. In addition, the light-shielding and heat-insulating curtain fabric of the present application is light in weight, has high washing fastness, and has a long service life. DETAILED DESCRIPTION

[0045] In order to better illustrate the content of the present invention, a detailed description is given below in conjunction with specific embodiments.

[0046] Example 1

[0047] A light-shielding and heat-insulating curtain fabric is prepared by the following preparation method:

[0048] Step 1, 10% of nano titanium dioxide, 5% of zirconium carbide and 85% of polyester chips are mixed, and the temperature of the first zone of the screw extruder is set to 250°C, the temperature of the second zone is set to 265°C, and the temperature of the third zone is set to 260°C. The mixed material is melt-spun through a twin-screw extruder, and after cooling, it is plasma-treated in a nitrogen atmosphere at a power of 300W to obtain a light-shielding reflective yarn with a diameter of 32 μm;

[0049] Step 2, immersing the silica aerogel fiber with a diameter of 15 μm and a porosity of 96% in an aqueous solution containing polyurethane with a concentration of 25% for dip coating, drying under hot air at 80° C. for 10 minutes, and then cross-linking at 120° C. for 5 minutes to obtain an aerogel core-covered yarn with a diameter of 22 μm;

[0050] Step 3, 30% paraffin-based phase change microcapsules and 70% polypropylene chips are mixed and heated to obtain a spinning solution at 180° C., which is then spun in a 25% NaCl solution, and finally stretched at a stretching ratio of 3.5 times to obtain a phase change energy storage yarn with a diameter of 8 μm;

[0051] Step 4, with the shading reflective yarn as the surface layer, the aerogel core-covered yarn as the intermediate connecting yarn to form a spacing layer, and the phase change energy storage yarn as the bottom layer, the three-layer jacquard spacing weaving method is adopted for weaving, wherein the warp yarn system includes the shading reflective yarn and the intermediate connecting yarn, the weft yarn system includes the phase change energy storage yarn and the intermediate connecting yarn, the surface layer adopts twill weaving, and the shading reflective yarn and the aerogel core-covered yarn are woven, the shading reflective yarn accounts for 80%, the warp yarn tension is 20cN, the aerogel core-covered yarn accounts for 20%, and the weft yarn tension is 16cN; the spacing layer is woven with "8"-shaped aerogel core-covered yarn, and the weft height is 1.2mm; the bottom layer adopts plain weaving, the warp density is 70 strands / cm, and the weft density is 65 strands / cm.

[0052] Step 5, place the woven blank in a mixed solution containing 20% ​​aqueous polyurethane, 5% nano-silicon dioxide and 75% water, immerse it at -0.08MPa for 5 minutes, and then perform a first-stage heat treatment at 80°C for 10 minutes, a second-stage heat treatment at 135°C for 3 minutes, and a third-stage heat treatment at 55°C for 2 hours to obtain a light-shielding and heat-insulating curtain fabric.

[0053] The surface density of the prepared sample is 134 g / m 2 , there is no attenuation after cleaning 50 times, the reflectivity of light in the 400-2500nm band is 97%, the absorptivity is 94%, and the thermal resistance is 0.48clo.

[0054] Example 2

[0055] A light-shielding and heat-insulating curtain fabric is prepared by the following preparation method:

[0056] Step 1, 14% of nano titanium dioxide, 3% of zirconium carbide and 83% of polyester chips are mixed, and the temperature of the first zone of the screw extruder is set to 255°C, the temperature of the second zone is set to 270°C, and the temperature of the third zone is set to 265°C. The mixed material is melt-spun through a twin-screw extruder, and after cooling, it is plasma-treated in a nitrogen atmosphere at a power of 350W to obtain a light-shielding reflective yarn with a diameter of 40 μm;

[0057] Step 2, immersing the silica aerogel fiber with a diameter of 18 μm and a porosity of 96% in an aqueous solution containing polyurethane with a concentration of 25% for dip coating, drying under hot air at 80° C. for 10 min, and then crosslinking at 120° C. for 5 min to obtain an aerogel core-covered yarn with a diameter of 25 μm;

[0058] Step 3, 30% paraffin-based phase change microcapsules and 70% polypropylene chips are mixed and heated to obtain a spinning solution at 180° C., which is then spun in a 25% NaCl solution, and finally stretched at a stretching ratio of 3.5 times to obtain a phase change energy storage yarn with a diameter of 9 μm;

[0059] Step 4, with the shading reflective yarn as the surface layer, the aerogel core-covered yarn as the intermediate connecting yarn to form a spacing layer, and the phase change energy storage yarn as the bottom layer, the three-layer jacquard spacing weaving method is adopted for weaving, wherein the warp yarn system includes the shading reflective yarn and the intermediate connecting yarn, the weft yarn system includes the phase change energy storage yarn and the intermediate connecting yarn, the surface layer adopts twill weaving, and the shading reflective yarn and the aerogel core-covered yarn are woven, the shading reflective yarn accounts for 80%, the warp yarn tension is 20cN, the aerogel core-covered yarn accounts for 20%, and the weft yarn tension is 16cN; the spacing layer is woven with "8"-shaped aerogel core-covered yarn, and the weft height is 1.2mm; the bottom layer adopts plain weaving, the warp density is 70 strands / cm, and the weft density is 65 strands / cm.

[0060] Step 5, place the woven blank in a mixed solution containing 20% ​​aqueous polyurethane, 5% nano-silicon dioxide and 75% water, immerse it at -0.08MPa for 5 minutes, and then perform a first-stage heat treatment at 80°C for 10 minutes, a second-stage heat treatment at 135°C for 3 minutes, and a third-stage heat treatment at 55°C for 2 hours to obtain a light-shielding and heat-insulating curtain fabric.

[0061] The surface density of the prepared sample is 125 g / m 2 , there is no attenuation after cleaning 50 times, the reflectivity of light in the 400-2500nm band is 98%, the absorptivity is 95%, and the thermal resistance is 0.49clo.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a light-shielding and heat-insulating curtain fabric, characterized in that: The following steps are involved: S1, mixing nano titanium dioxide, zirconium carbide and polyester chips, performing melt spinning through a twin-screw extruder, cooling and then performing plasma treatment to obtain a light-shielding reflective yarn; S2, dipping the silica aerogel fiber into a polyurethane solution for dip coating, and curing to obtain an aerogel core-covered yarn; S3, mixing the phase change microcapsules with polypropylene slices, wet spinning, and stretching to obtain phase change energy storage yarn; S4. The shading reflective yarn is used as the surface layer, the aerogel core-wrapped yarn is used as the middle connecting yarn to form a spacing layer, and the phase change energy storage yarn is used as the bottom layer. A three-layer jacquard spacing weaving method is adopted for weaving, and then vacuum impregnation and gradient heat treatment are performed in sequence to obtain the shading and heat-insulating curtain fabric.

2. The method for preparing a light-shielding and heat-insulating curtain fabric according to claim 1, characterized in that: In step S1, the mass ratio of the nano titanium dioxide, zirconium carbide and polyester chips is 1:0.3-0.8:7-10.

3. The method for preparing a light-shielding and heat-insulating curtain fabric according to claim 1, characterized in that: In step S1, the twin-screw extruder in the melt spinning process includes three sections, the temperature of the first section is 250-255°C, the temperature of the second section is 265-270°C, and the temperature of the third section is 260-265°C; The plasma treatment is carried out in a nitrogen atmosphere with a power of 300-350W.

4. The method for preparing a light-shielding and heat-insulating curtain fabric according to claim 1, characterized in that: In step S2, the diameter of the silica aerogel fiber is 10-18 μm, and the porosity is 92-96%; The polyurethane concentration in the polyurethane solution is 20-30%, and the solvent is selected from at least one of water, ethanol and N-methylpyrrolidone.

5. The method for preparing a light-shielding and heat-insulating curtain fabric according to claim 1, characterized in that: In step S2, the specific parameters of the curing are: drying under hot air at 70-90°C for 10-15 minutes, and then cross-linking at 120-125°C for 5-10 minutes.

6. The method for preparing a light-shielding and heat-insulating curtain fabric according to claim 1, characterized in that: In step S3, the mass ratio of the phase change microcapsules to the polypropylene slices is 1:2.5-4; During the wet spinning process, the temperature of the spinning solution is 180-190° C., and the coagulation bath is a NaCl solution with a concentration of 25%; The stretching multiple is 3 to 4 times.

7. The method for preparing a light-shielding and heat-insulating curtain fabric according to claim 1, characterized in that: In step S4, the parameters of the three-layer jacquard interval weaving are: The warp yarn system includes light-shielding reflective yarn and intermediate connecting yarn, and the weft yarn system includes phase-change energy storage yarn and indirect connecting yarn; The surface layer adopts twill weave, the warp tension is controlled at 18-22cN, and the weft tension is controlled at 15-18cN; The spacer layer is formed by "8" shaped middle connecting yarn, and the weaving heddle height is 1.0~1.5mm; The bottom layer adopts plain weave with a warp density of 65 to 75 yarns / cm and a weft density of 60 to 70 yarns / cm.

8. The method for preparing a light-shielding and heat-insulating curtain fabric according to claim 1, characterized in that: In step S4, the vacuum impregnation solution includes 15-25% aqueous polyurethane, 3-10% nano-silicon dioxide and 65-80% water; The vacuum degree of the vacuum impregnation is -0.08 to -0.05 MPa, and the impregnation time is 5 to 10 minutes; The gradient heat treatment includes one stage heat treatment, two stage heat treatment and three stage heat treatment, wherein the temperature of the first stage heat treatment is 80-90°C and the time is 5-12 minutes, the temperature of the second stage heat treatment is 130-140°C and the time is 3-5 minutes, and the temperature of the third stage heat treatment is 55-60°C and the time is 1-2 hours.

9. A light-shielding and heat-insulating curtain fabric obtained by the preparation method according to any one of claims 1 to 8, characterized in that: It includes a light-shielding reflective surface layer, an aerogel core-spun yarn spacer layer and a phase-change energy storage bottom layer.

10. The light-shielding and heat-insulating curtain fabric according to claim 9, characterized in that: The density of the light-shielding reflective surface layer is 120 to 140 strands / cm 2 , wherein the diameter of the light-shielding reflective yarn is 30 to 50 μm; The height of the aerogel core-covered yarn spacing layer is 1.0 to 1.2 mm, wherein the diameter of the aerogel core-covered yarn is 20 to 26 mm; The diameter of the phase change energy storage yarn in the phase change energy storage bottom layer is 8-10 μm, and the strength is ≥3.2 cN / dtex.