Processing technology of thermoregulation fabric with boiling visual effect

Abstract

The invention discloses a processing technology of a thermoregulation fabric with a boiling visual effect, and relates to the technical field of textiles, and the processing technology is characterized in that polytetrafluoroethylene and polyurethane are blended and prepared into an initial membrane through a tape casting extrusion membrane forming method, then two-way pre-stretching is carried out to form a base membrane with an initial microporous structure, and the base membrane is subjected to hot pressing to form the thermoregulation fabric with the boiling visual effect. The preparation method comprises the following steps: preparing a polyether ester elastomer solution, doping nano silicon dioxide into the polyether ester elastomer solution to prepare a composite coating, coating two sides of a basement membrane with the composite coating, curing to form a functional coating, and carrying out secondary gradient stretching on the coated basement membrane to finally form a composite membrane layer which is internally provided with through gradient micropores. And the composite film layer is compounded with the surface layer and the inner layer to form an airflow channel. According to the invention, through control of various processing parameters, processing flow design and processing ratio of various raw materials, the required fabric can be manufactured in a flow manner, selected equipment is common or adaptable equipment in the textile industry, process parameters and process steps are specific, and the method has a good industrial application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textiles, more particularly, it relates to a processing technology of a boiling visual effect temperature regulating fabric. BACKGROUND

[0002] With the rapid development of multifunctional textiles, the market demand for fabrics integrating protection, thermal management and interactive experience is increasing.

[0003] At present, the temperature control function of the fabric mainly depends on phase change materials or moisture-wicking fibers, and the temperature regulating process is slow and has no visual perception. Although the traditional microporous membrane laminated fabric has certain waterproof and breathable properties, its homogeneous microporous structure is difficult to realize the explosive directional discharge of steam and rapid heat dissipation when dealing with high-temperature liquid splashing. How to combine this fast thermal response mechanism with intuitive visual feedback and realize the production of the fabric through an industrialized process is a difficult problem to be solved.

[0004] Therefore, it is necessary to propose an innovative processing technology to manufacture a multifunctional temperature regulating fabric which not only has efficient waterproof and moisture permeability and fast thermal response capability, but also can produce a unique boiling visual effect when heated. SUMMARY

[0005] In view of the deficiencies of the prior art, the purpose of the present application is to provide a processing technology of a boiling visual effect temperature regulating fabric, which can stably and efficiently prepare the temperature regulating fabric with boiling visual effect through a series of specific material processing, structure forming and compounding steps.

[0006] The above technical purpose of the present application is realized by the following technical scheme: a processing technology of a boiling visual effect temperature regulating fabric, comprising the following processing steps: S1. After the yarn of polyester fiber and spandex fiber is woven, waterproof finishing is performed to obtain a surface layer, then a plurality of flow guide grooves are formed on one side of the surface layer by hot pressing, and a plurality of flow guide holes are formed on the bottom surface of the flow guide grooves by laser drilling; S2. The yarn of cotton fiber and viscose fiber is woven in a flower type through-hole organization to obtain a back layer with a plurality of air holes integrally formed, and then soft finishing is performed; S3. After bidirectional pre-stretching of the membrane formed by extrusion casting, coating is performed on both sides of the membrane, and then gradient stretching is performed to form a composite membrane layer with gradient microporous structure; S4. Point gluing operation is performed on both sides of the composite membrane layer, the thickness of the glue points is 0.3-0.5mm, the side with smaller pore diameter of the composite membrane layer is combined with the surface layer, and the side with larger pore diameter is combined with the back layer to form a composite fabric containing air layer one and air layer two; In step S3, further comprising: S3.1. Blend the polytetrafluoroethylene resin with the polyurethane resin at a mass ratio of 5:5-7:3, then add a solvent to form a uniform spinning solution; S3.2. Use an extrusion flow casting method to prepare an initial film from the spinning solution, then perform bidirectional pre-stretching at a temperature of 80-120℃ to form a base film with a preliminary microporous structure; S3.3. Prepare a polyether ester elastomer solution and uniformly incorporate 3%-8% nano-silica into it to form a composite coating, then uniformly coat the composite coating on both sides of the base film using a roller coating device, and form a functional coating after curing; S3.4. Perform secondary gradient stretching on the coated base film, with a stretching ratio of 1.2-1.5 times on one side of the surface layer at a temperature of 70-90℃, and a stretching ratio of 1.8-2.2 times on one side of the inner layer at a temperature of 90-110℃, then perform heat setting and curing after stretching, finally forming a composite film layer with gradient micropores inside, with a pore size gradient increasing from 0.1-0.3μm on one side of the surface layer to 0.5-1μm on one side of the inner layer.

[0007] Preferably, in steps S3.1-S3.2, the melt blending extrusion temperature is 180-220℃, the longitudinal stretching ratio is the same as the transverse stretching ratio during bidirectional pre-stretching, which is 1.5-2 times, and the stretching temperature is 100-120℃.

[0008] Preferably, in step S3.3, the incorporated nano-silica is hydrophobically treated with methyltrimethoxysilane, with a treatment amount of 5%-8% of the mass of the nano-silica, and the curing temperature is 130-150℃, with a curing time of 20-30min.

[0009] Preferably, in step S3.4, the porosity of the gradient micropores is 40%-60%, the heat setting temperature is 120-130℃, the heat setting time is 10-15min, and the temperature difference between the two sides of the base film during gradient stretching needs to exceed 10℃.

[0010] Preferably, in step S1, the mass ratio of polyester fiber to spandex fiber is 9:1-8:2, the waterproof finishing uses a fluorocarbon waterproof agent containing 5%-8%, the padding liquid rate is 60%-70%, and the baking temperature is 160-180℃, with a baking time of 3-5min, Preferably, in step S1, a hot press roller with protrusions is used to perform hot pressing on the side of the surface layer away from the inner layer, with a protrusion width of 10-15mm, an adjacent protrusion spacing of 8-12mm, a hot pressing temperature of 120-150℃, a hot pressing pressure of 0.3-0.5MPa, and a hot pressing time of 10-15s, Preferably, in step S1, a CO2 laser puncher is used, the laser power is 40-60 W, the laser power is matched with the punching speed, the edge of the flow guide hole is driven to melt and seal, and the aperture of the flow guide hole is 0.8-1.5 mm.

[0011] Preferably, in step S2, the mass ratio of cotton fibers to viscose fibers is 6:4-5:5, a multi-arm loom is used for weaving, the number of heald frames is 16-24 pages, the aperture of the air hole is 0.5-1.2 mm, and the air hole is arranged in a strip along the weft direction of the inner layer.

[0012] Preferably, in step S4, the material of the glue point is water-based polyurethane glue, the glue points are arranged in a strip along the weft direction of the surface layer, the width of the strip-shaped glue points is 5-10 mm, the strip spacing is 10-20 mm, the compounding pressure is 0.1-0.3 MPa, the compounding temperature is 40-50 DEG C, and the compounding speed is 5-8 m / min.

[0013] Preferably, in step S4, the glue points on both sides of the composite film layer are symmetrically arranged, the air holes and the flow guide holes are oppositely arranged along the thickness direction of the composite film layer and are staggered with the glue points along the warp direction of the surface layer, the air layer one is communicated with the plurality of flow guide holes, the air layer two is communicated with the plurality of air holes, and the air layer one and the air layer two are communicated through the plurality of gradient micro-holes.

[0014] In summary, the present application has the following beneficial effects: 1. When the high-temperature liquid penetrates into the air layer one through the flow guide groove and the flow guide hole and contacts the composite film layer to quickly conduct heat, the air in the air layer two expands under the heat, and the high-temperature accelerates the vaporization of the liquid to generate a large amount of steam, the steam and the expanded air jointly form a high-speed upward airflow which successively passes through the gradient micro-holes, the air layer one and the flow guide hole, pushes the liquid on the surface layer to roll to form a boiling visual effect, and the airflow movement and the steam escape continuously take away heat to quickly cool down, realizing the perfect combination of passive rapid cooling and dynamic visual feedback.

[0015] 2. By controlling the thickness and arrangement of the glue points, the thickness uniformity and structural stability of the air layer one and the air layer two are ensured, and at the same time, the glue points and the flow guide groove are arranged in a staggered manner to avoid the airflow passage being blocked and improve the steam escape speed under thermal shock.

[0016] 3. By differentiating the tensile ratio and temperature on both sides of the composite film layer, the increasing structure of the micropore aperture from the surface layer to the inner layer is realized, which not only ensures the barrier property to liquid water, but also improves the directional flow efficiency of steam and air. By controlling the heat pressing parameters, laser drilling parameters, special organization weaving process, staggered point gluing composite process, coating process, gradient stretching process and processing and proportioning of each raw material, the temperature regulating fabric with boiling visual effect can be manufactured in a process, the process steps are clear, the selected equipment is commonly used or adaptable in the textile industry, the process parameter range is specific, and good industrial application prospect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a processing flowchart of the present application; Figure 2 is an exploded view of the fabric processed by the present application; Figure 3 is a sectional view of the fabric processed by the present application; Figure 4 is Figure 3 is an enlarged view of A in the middle; Figure 5 is a microsectional view of the composite film layer in the present application.

[0018] In the figure: 1, surface layer; 2, composite film layer; 201, base film; 202, functional coating; 3, inner layer; 4, glue point; 5, air layer one; 6, air layer two; 7, gradient micropore; 8, flow guide groove; 9, flow guide hole; 10, air hole. DETAILED DESCRIPTION

[0019] The present application will be described in detail below in combination with the drawings and examples.

[0020] Example 1: A processing technology of a boiling visual effect temperature regulating fabric, as shown in Figures 1-5 , including the following processing steps: S1-S2. Spinning polyester fibers and spandex fibers at a ratio of 8.5:1.5 to form yarns, weaving a gray fabric with a warp density of 120 and a weft density of 100 threads / inch by means of a rapier loom, then dipping the gray fabric in an aqueous solution containing 6% fluorocarbon waterproofing agent, with a pick-up rate of 65%, and then baking at 170°C for 4 minutes to obtain a surface layer 1 with waterproof and oil-proof effects, using a strip-shaped convex mold with a width of 12 mm by means of a hot press at 120°C and 0.35 MPa for 12 seconds, with a flat support mold on the other side, thereby forming a flow guide groove 8 with a width of 12 mm on one side of the surface layer 1, setting the power of a CO2 laser perforating machine to 50 W and the perforating speed to 40 mm / s, and performing strip-shaped perforating operations in the area of the bottom surface of the flow guide groove 8, thereby forming a plurality of flow guide holes 9 with a diameter of 1 mm, high-temperature hot pressing makes the fibers at the bottom surface of the flow guide groove 8 combine more closely, and the high temperature during laser perforating performs edge sealing treatment on the incision edges, so that the flow guide holes 9 are not easy to tear, ensuring the structural stability of the surface layer 1, spinning cotton fibers and viscose fibers at a ratio of 5.5:4.5 to form yarns and feeding them into a dobby loom, weaving by programming control of the heald frame to form fancy openwork by combining plain weave and openwork weave, thereby weaving an inner layer 3 integrally formed with strip-shaped arranged ventilation holes 10, the ventilation holes 10 have a diameter of 0.8 mm, dipping in an aqueous solution containing 2.5% silicone softener with a pick-up rate of 55%, and obtaining the inner layer 3 after air drying at room temperature, thereby improving the wearing comfort of the inner layer 3; S3.1-S3.2. A polytetrafluoroethylene resin with a melt index of 1.2 g / 10 min and a thermoplastic polyurethane elastomer with a Shore hardness of 88A are weighed at a mass ratio of 6:4, a solvent is added to prepare a spinning solution, and then extruded through the die of a twin-screw extruder, cooled and formed by a 30°C cooling roller to obtain a substrate film 201 blank with a thickness of 60 μm, the extrusion temperature is set to 200°C, and the screw rotation speed is set to 250 r / min, then the substrate film 201 blank is placed in a biaxial stretching machine, the longitudinal and transverse stretching ratios are both set to 1.8 times, and the stretching temperature is set to 110°C, thereby obtaining a substrate film 201 with a preliminary microporous structure; S3.3-S3.4.5% of hydrophobic treated nano-silica is added into the polyether ester elastomer solution with a solid content of 25%, and then dispersed by a high-speed dispersion machine at 1800 r / min for 35 min. The slurry is coated on both sides of the base film 201 by a coating machine, with a coating thickness of 12 μm. The composite film blank is obtained after curing in an oven at 140℃ for 25 min. The composite film blank is placed in an asymmetric two-way stretching machine for gradient stretching. The stretching ratio of the surface layer 1 side is set to 1.3 times, and the temperature is set to 75℃. The stretching ratio of the inner layer 3 side is set to 2 times, and the temperature is set to 90℃. After stretching, heat setting is performed at 125℃ for 12 min to obtain a composite film layer 2 with a gradient micro-porous structure 7. The micro-pore diameter of the composite film layer 2 close to the surface layer 1 side is 0.2 μm, and the micro-pore diameter close to the inner layer 3 side is 0.8 μm. This allows the composite film layer 2 to limit the permeation of liquid water while allowing steam and air to pass through. The porosity of the gradient micro-porous structure 7 is 50%, ensuring the air flow rate. S4. A strip-shaped dispensing operation is performed on both sides of the composite film layer 2 by a dispensing machine to form a plurality of glue points 4 for compounding. The thickness of the glue points 4 is set to 0.4 mm. The plurality of glue points 4 are arranged along the weft direction of the surface layer 1. The spacing between the glue points 4 arranged along the warp direction of the surface layer 1 is 15 mm. The surface layer 1 is compounded with the side of the composite film layer 2 with smaller pore diameter, and the inner layer 3 is compounded with the side of the composite film layer 2 with larger pore diameter by a compounding machine. The compounding pressure is 0.2 MPa, the compounding temperature is 45℃, and the compounding speed is 6 m / min. After compounding, the surface layer 1 and the inner layer 3 are supported by the plurality of glue points 4 to form a finished fabric with air layer one 5 and air layer two 6. The strip-shaped glue points 4 are offset along the warp direction of the surface layer 1 during compounding with the flow guide groove 8, so that the flow guide hole 9 is arranged opposite to the air hole 10. Since the air layer one 5 and the plurality of flow guide holes 9 are in communication with each other, the air layer two 6 and the plurality of air holes 10 are in communication with each other, and the air layer one 5 and the air layer two 6 are in communication with each other through the plurality of gradient micro-pores 7, thereby ensuring a smooth gas flow path. When the high-temperature liquid penetrates into the air layer one 5 through the flow guide groove 8 and the flow guide hole 9 and contacts the composite film layer 2 to quickly conduct heat, the air in the air layer two 6 expands due to heat, and the high-temperature liquid vaporizes to generate a large amount of steam. The steam and the expanded air form a high-speed upward airflow in sequence through the gradient micro-pores 7, the air layer one 5, and the flow guide hole 9, which pushes the liquid on the surface layer 1 to form a boiling visual effect. The airflow movement and steam escape continuously remove heat to achieve rapid cooling, realizing the perfect combination of passive rapid cooling and dynamic visual feedback.

[0021] Example 2: A boiling visual effect temperature adjusting fabric processing technology, as shown in Figure 1 , Figure 2 and Figure 5As shown, the difference from Example 1 is as follows: In steps S3.1-S3.4, the mass ratio of polytetrafluoroethylene resin to thermoplastic polyurethane elastomer is set to 5:5, the thickness of the base film 201 blank is 50μm, the pre-stretching longitudinal and transverse stretching ratios are 1.5 times, during gradient stretching, the stretching ratio on the surface layer 1 side is set to 1.2 times and the stretching temperature is set to 80℃, the stretching ratio on the inner layer 3 side is set to 1.8 times and the temperature is set to 95℃, the pore diameter of the gradient micropores 7 near the surface layer 1 side is 0.1μm, the pore diameter near the inner layer 3 side is 0.5μm, and the porosity is 40%. In steps S1-S2, the hot pressing temperature of the hot press is 110℃, the power of the CO2 laser drilling machine is set to 40W, and the diameter of the guide hole 9 is 1.2mm.

[0022] Example 3: A processing technology for a temperature-regulating fabric with a boiling visual effect, such as... Figure 1 , Figure 2 and Figure 5 The difference from Example 1 is as follows: In steps S3.1-S3.4, the mass ratio of polytetrafluoroethylene resin to thermoplastic polyurethane elastomer is set to 7:3, the thickness of the base film 201 blank is 80μm, and the pre-stretching longitudinal and transverse stretching ratios are both set to 2 times. In step S3, the stretching ratio on the surface layer 1 side is set to 1.5 times and the temperature is set to 85℃, the stretching ratio on the inner layer 3 side is set to 2.2 times and the temperature is set to 105℃, the pore size of the gradient micropores 7 on the surface layer 1 side is 0.3μm, the pore size on the inner layer 3 side is 1μm, and the porosity of the gradient micropores 7 is 60%. In steps S1-S2, the hot pressing temperature of the hot press is set to 130℃, the power of the CO2 laser drilling machine is set to 60W, and the diameter of the guide hole 9 is 1.5mm.

[0023] Comparative Example 1: Figures 1-3 As shown, the composite film layer 2 is prepared using a traditional symmetrical stretching process, that is, the stretching ratio on both sides of the composite film layer 2 is 1.5 times. The flow channel 8 is not formed by hot pressing on one side of the surface layer 1. Instead, laser drilling is performed directly on the surface layer 1. The remaining processes are the same as in Example 1.

[0024] Comparative Example 2: Figure 1 , Figure 2 and Figure 5 As shown, an air layer is formed by a woven spacer yarn process, that is, the outer layer 1 and the inner layer 3 are connected by spacer yarns. No glue bonding process is used, and there is no functional coating 202 on both sides of the composite film layer 2. The rest of the process is the same as in Example 1.

[0025] Performance testing: The fabrics prepared in Examples 1-3 and Comparative Examples 1-2 were subjected to performance tests, and the results are shown in the table below:

[0026] The test results show that the fabric prepared by the process of this invention has a boiling visual response time of ≤2s, a temperature drop of ≥16℃ within 10s, good uniformity of air layer thickness, and excellent water resistance of the guide holes 9 and gradient micropores 7. By controlling the hot pressing parameters, laser perforation parameters, special weaving process, staggered adhesive composite process, coating process, gradient stretching process, and the processing ratio of each raw material, temperature-regulating fabric with boiling visual effect can be manufactured in a streamlined process. The process steps are clear, the selected equipment is all commonly used or compatible equipment in the textile industry, the process parameter range is specific, and it has good prospects for industrial application.

[0027] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A processing technology for a temperature-regulating fabric with a boiling visual effect, characterized in that: The processing steps include the following: S1. After weaving the yarn of polyester fiber and spandex fiber blend, waterproof finishing is performed to obtain surface layer (1). Then, several guide grooves (8) are formed by hot pressing one side of surface layer (1). Several guide holes (9) are formed by laser drilling on the bottom surface of guide groove (8). S2. The yarn of cotton fiber and viscose fiber is woven in a fancy openwork weaving method to obtain an inner layer (3) with several ventilation holes (10) in one piece, and then softened. S3. After bidirectional pre-stretching of the film formed by extrusion casting, a coating is applied to both sides of the film, and then the film is stretched by gradient to form a composite film layer (2) with a gradient micropore (7) structure. S4. Apply adhesive (4) to both sides of the composite film layer (2). The thickness of the adhesive dots (4) is 0.3-0.5 mm. After the side with smaller pore size of the composite film layer (2) is combined with the surface layer (1) and the side with larger pore size is combined with the inner layer (3), a composite fabric containing air layer one (5) and air layer two (6) is formed. Step S3 further includes: S3.

1. After blending polytetrafluoroethylene resin and polyurethane resin at a mass ratio of 5:5-7:3, a solvent is added to form a uniform spinning solution. S3.

2. The spinning solution was made into an initial film by extrusion casting film forming method, and then bidirectional pre-stretched at 80-120℃ to form a base film with a preliminary microporous structure (201); S3.

3. Prepare a polyether ester elastomer solution and uniformly incorporate 3%-8% nano silica to form a composite coating. Apply the obtained composite coating uniformly to both sides of the base film (201) using a roller coating equipment. After curing, a functional coating (202) is formed. S3.

4. The coated base film (201) is subjected to secondary gradient stretching. The stretching ratio of the surface layer (1) is 1.2-1.5 times and the temperature is 70-90℃. The stretching ratio of the inner layer (3) is 1.8-2.2 times and the temperature is 90-110℃. After stretching, the film is heat-set and cured to finally form a composite film layer (2), which has through gradient micropores (7) inside. The pore size increases from 0.1-0.3μm to 0.5-1μm from the surface layer (1) to the inner layer (3).

2. The processing technology of a temperature-regulating fabric with a boiling visual effect according to claim 1, characterized in that: In steps S3.1-S3.2, the melt blending extrusion temperature is 180-220℃, the longitudinal stretching ratio during biaxial pre-stretching is the same as the transverse stretching ratio, which is 1.5-2 times, and the stretching temperature is 100-120℃.

3. The processing technology of a temperature-regulating fabric with a boiling visual effect according to claim 1, characterized in that: In step S3.3, the incorporated nano-silica is hydrophobically treated with methyltrimethoxysilane, the amount of which is 5%-8% of the mass of the nano-silica, the curing temperature is 130-150℃, and the curing time is 20-30 min.

4. The processing technology of a temperature-regulating fabric with a boiling visual effect according to claim 1, characterized in that: In step S3.4, the porosity of the gradient micropores (7) is 40%-60%, the heat setting temperature is 120-130℃, the heat setting time is 10-15min, and the temperature difference between the two sides of the base film (201) during gradient stretching needs to exceed 10℃.

5. The processing technology of a temperature-regulating fabric with a boiling visual effect according to claim 1, characterized in that: In step S1, the mass ratio of polyester fiber to spandex fiber is 9:1-8:2, the waterproofing finishing uses a fluorocarbon waterproofing agent containing 5%-8%, the padding liquid rate is 60%-70%, the baking temperature is 160-180℃, and the baking time is 3-5 minutes.

6. The processing technology of a temperature-regulating fabric with a boiling visual effect according to claim 5, characterized in that: In step S1, a hot press roller with raised strips is used to perform hot pressing on the side of the surface layer (1) away from the inner layer (3). The width of the raised strips is 10-15mm, the distance between adjacent raised strips is 8-12mm, the hot pressing temperature is 120-150℃, the hot pressing pressure is 0.3-0.5MPa, and the hot pressing time is 10-15s.

7. The processing technology of a temperature-regulating fabric with a boiling visual effect according to claim 6, characterized in that: In step S1, a CO2 laser drilling machine is used with a laser power of 40-60W. The laser power is matched with the drilling speed to drive the edge of the guide hole (9) to melt and seal. The diameter of the guide hole (9) is 0.8-1.5mm.

8. The processing technology of a temperature-regulating fabric with a boiling visual effect according to claim 1, characterized in that: In step S2, the mass ratio of cotton fiber to viscose fiber is 6:4-5:5, and the weaving is carried out using a multi-arm loom with 16-24 heald frames. The ventilation holes (10) have a diameter of 0.5-1.2 mm and are arranged in strips along the weft direction of the inner layer (3).

9. The processing technology of a temperature-regulating fabric with a boiling visual effect according to claim 1, characterized in that: In step S4, the material of the adhesive dots (4) is water-based polyurethane adhesive. The adhesive dots (4) are arranged in strips along the weft direction of the surface layer (1). The width of the strip-arranged adhesive dots (4) is 5-10 mm, the spacing between the strips is 10-20 mm, the composite pressure is 0.1-0.3 MPa, the composite temperature is 40-50℃, and the composite speed is 5-8 m / min.

10. The processing technology of a temperature-regulating fabric with a boiling visual effect according to claim 9, characterized in that: In step S4, the adhesive dots (4) on both sides of the composite film layer (2) are symmetrically arranged, the vent holes (10) and the flow guide holes (9) are arranged opposite to each other along the thickness direction of the composite film layer (2) and are staggered with the adhesive dots (4) along the meridian direction of the surface layer (1). Air layer one (5) is interconnected with several flow guide holes (9), air layer two (6) is interconnected with several vent holes (10), and air layer one (5) and air layer two (6) are interconnected through several gradient micropores (7).

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