Continuous cool feeling textile with 3D heat conduction network and preparation method of continuous cool feeling textile

Abstract

The invention discloses a continuous cool feeling textile with a 3D heat conduction network and a preparation method of the continuous cool feeling textile. The preparation method of the cool-feeling textile comprises the following steps: respectively preparing hydrophobic filaments and hydrophilic filaments containing heat-conducting particles through a melt spinning process; the fabric outer layer adopts hydrophilic filaments, the fabric inner layer adopts hydrophobic filaments, and a weft knitting double-sided machine is adopted for double-sided weaving to obtain a double-sided knitted fabric; the obtained double-faced knitted fabric is pressurized, and the continuous cool feeling textile of the 3D heat conduction network is obtained. The prepared fabric is provided with an upper-layer structure and a lower-layer structure, under the wettability difference, the fabric has the excellent one-way moisture guiding performance, and the one-way moisture guiding index is larger than 600%; the fabric not only has a 3D heat-conducting network structure and can realize instant heat dissipation and obtain the effect of a contact cool feeling, but also can conduct sweat to the surface of the fabric under the condition that a human body continuously sweats due to heat so as to be evaporated and cooled, so that the continuous cool feeling can be realized.

Description

Technical Field

[0001] The invention relates to a continuous cool feeling textile with a 3D heat conductive network and a preparation method thereof, belonging to the technical field of functional textile materials. Background Art

[0002] Clothing, as the second layer of human skin, can achieve real-time cooling for individual body types through functional design. Therefore, personal thermal management textiles have been widely developed in recent years. Heat diffusion is mainly achieved through four ways: conduction, radiation, convection and evaporation. Among them, cooling textiles prepared by radiation and evaporation methods have been widely studied. However, conduction as the only heat dissipation method of textiles itself has been rarely studied. Therefore, the development of textiles with high thermal conductivity is a very promising research direction.

[0003] Most existing summer fabrics are made of cotton fabrics, but their own thermal conductivity is extremely low. For this reason, "cool textiles" have emerged in the market to achieve human body cooling. Because of its improved thermal conductivity, it can quickly transfer the heat of the human body to the external environment, giving people a cool feeling. There are two main methods for preparing "cool textiles": one is to achieve cooling by impregnating cool finishing agents such as silicone oil, but the impregnated textiles are not resistant to washing and their performance deteriorates after long-term use; the other is to add high thermal conductivity fillers and spin them together with the polymer body. However, to achieve high thermal conductivity means a high amount of fillers, which usually results in poor mechanical properties of the material. In addition, these methods can only diffuse heat in the direction of the fabric surface. If the heat generated by the human skin can be directly diffused to the outside world in a direction perpendicular to the fabric, that is, to build a 3D thermal conductive network structure, it will undoubtedly achieve faster and more efficient cooling. More importantly, this kind of cool textile can only achieve a cool feeling at the moment of contact by quickly dissipating heat after contacting the skin, and cannot achieve a continuous cool feeling. Summary of the invention

[0004] The purpose of the present invention is to address the technical problems that existing cool textiles can only achieve contact coolness through heat conduction and heat dissipation but cannot achieve continuous coolness, and that this heat conduction only stays within the surface, the heat dissipation is slow, and the heat cannot be quickly dissipated to the environment in the vertical direction. The present invention provides a continuous cool textile with a 3D thermal conductive network and a preparation method thereof. The cool fabric described in the present invention is a double-layer knitted structure, wherein the inner layer in contact with the skin adopts hydrophobic filaments containing thermal conductive particles, and the outer layer adopts hydrophilic filaments containing thermal conductive particles. After weaving and forming, the fabric is subjected to heat pressing treatment to finally obtain a continuous cool fabric with a 3D thermal conductive network.

[0005] In order to achieve the above object, the present invention provides a method for preparing a continuous cool feeling textile, comprising the following steps:

[0006] Step 1: Add the thermally conductive particles to the hydrophobic polymer and the hydrophilic polymer respectively, mix them evenly, and then granulate them in a granulator to obtain masterbatches. The masterbatches are used to obtain the corresponding hydrophobic filaments and hydrophilic filaments through a melt spinning process;

[0007] Step 2: The outer layer of the fabric uses the hydrophilic filaments obtained in step 1, and the inner layer of the fabric uses the hydrophobic filaments obtained in step 1, and a weft knitting double-sided machine is used to double-sidedly weave the two filaments to obtain a double-sided knitted fabric;

[0008] Step 3: Use a hot press to pressurize the double-sided knitted fabric obtained in step 2 to obtain a continuous cooling textile having a 3D thermal conductive network structure.

[0009] In the present invention, the molecular weight of the hydrophobic polymer and the hydrophilic polymer can be selected by a person skilled in the art according to the desired properties of the filament and the melt spinning process. Different types of polymers have different molecular weight ranges suitable for melt spinning. For example, a higher molecular weight can generally improve the strength and modulus of the filament, but at the same time may also lead to an increase in melt viscosity, bringing challenges to the spinning process. In short, the molecular weight of the polymer can be determined by a person skilled in the art.

[0010] Preferably, the thermally conductive particles in step 1 are selected from at least one of boron nitride, graphene, silicon nitride, aluminum nitride, silicon carbide, magnesium oxide, aluminum oxide, zinc oxide and carbon nanotubes.

[0011] Preferably, the hydrophobic polymer in step 1 is at least one selected from polyethylene terephthalate, polyethylene, polypropylene, polylactic acid, polyvinylidene fluoride, polyurethane, polysulfone, polyethersulfone, polyarylsulfone, polyphenylene sulfone, polymethyl methacrylate, polystyrene and styrene-methyl methacrylate copolymer resin;

[0012] The hydrophilic polymer is at least one of cellulose acetate, chitosan, polyacrylonitrile, ethylene-vinyl alcohol copolymer, polyamide and polyimide.

[0013] Preferably, the proportion of thermally conductive particles added in step 1 accounts for 1-10% by mass of the total raw materials (polymer + thermally conductive particles).

[0014] Preferably, the spinning process parameters of the hydrophobic filament in step 1 are: melt temperature 150-280° C., melt pressure 0.6-1.2 MPa, and spinning speed 150-200 m / min;

[0015] The spinning process parameters of the hydrophilic filaments are: melting temperature 240-270° C., melt pressure 1-2 MPa, and spinning speed 400-500 m / min.

[0016] Preferably, the process conditions of the pressurization treatment in step 3 are: the temperature of the hot press is set at room temperature, the pressure is 5 to 10 MPa, and the pressing time is 5 to 10 s.

[0017] The present invention also provides a continuous cool feeling textile prepared by the preparation method.

[0018] The present invention also provides the use of the continuous cool feeling textiles prepared by the above preparation method in the preparation of cool feeling clothing and cool feeling household products.

[0019] The cool textiles prepared by the present invention have heat-conducting particles in the filaments, which are distributed along the axial orientation of the filaments during the spinning and stretching process to form a heat-conducting path, which improves the in-plane thermal conductivity of the material; and because the vertical direction of the fabric is pressed, the longitudinal contact of the filaments is closer, thereby improving the thermal conductivity of the fabric in the out-of-plane direction, and finally forming a 3D heat-conducting network structure for the fabric, achieving excellent thermal conductivity. Among them, the in-plane thermal conductivity is greater than 5W / (m·K), and the out-of-plane thermal conductivity is greater than 0.3W / (m·K).

[0020] In addition, the obtained fabric has an upper and lower two-layer structure, and under the condition of wettability difference, the fabric has excellent unidirectional moisture conduction performance, and the unidirectional moisture conduction index is greater than 600%.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention prepares an upper hydrophilic layer and a lower hydrophobic layer by a simple process of knitting and pressing, and utilizes the difference in wettability to obtain an excellent unidirectional moisture conduction effect, which is beneficial to the evaporation of sweat and achieves continuous cooling of the human body.

[0023] 2. The present invention utilizes the strong stretching effect of melt spinning to evenly arrange the thermally conductive particles in the filaments, thereby achieving in-plane heat dissipation. At the same time, pressing is used to greatly increase the contact area between layers, thereby achieving out-of-plane heat dissipation. The 3D thermally conductive network structure thus formed enables the fabric to have excellent thermal conductivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a diagram of the structure and heat dissipation principle of a continuously cool textile with a 3D thermal conductive network. DETAILED DESCRIPTION

[0025] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0026] In the following examples, the materials and reagents used are all conventional commercial products unless otherwise specified. The CAS number of polyethylene terephthalate is 25038-59-9, and the molecular weight is 20,000; the CAS number of cellulose acetate is 9004-35-7, and the molecular weight is 100,000; the CAS number of polyamide is 25038-54-4, and the molecular weight is 20,000; and the CAS number of polyethylene is 25214-39-5, and the molecular weight is 200,000.

[0027] Example 1

[0028] A method for preparing a continuously cool textile with a 3D thermal conductive network comprises the following steps:

[0029] Boron nitride nanosheets are added to polyethylene terephthalate and cellulose acetate at a ratio of 10wt%, mixed evenly, and granulated in a granulator to obtain master batches, which are melted in a composite screw extruder, and the melt is injected into the spinneret of a spinning die through precise control of a metering pump. After the screw is pressurized, the melt is extruded from the spinneret, and then drawn by a drawing roller, and the corresponding hydrophobic and hydrophilic filaments are obtained by collecting. The spinning process parameters of the hydrophobic filaments are: melting temperature 240-280℃, melt pressure 1MPa, and collection speed 150m / min, and the fineness of the hydrophobic filaments obtained is about 8dtex; the spinning process parameters of the hydrophilic filaments are: melting temperature 240-270℃, melt pressure 1.5MPa, and collection speed 400m / min, and the fineness of the hydrophilic filaments obtained is about 5dtex.

[0030] The outer layer of the fabric is made of hydrophilic filaments, and the inner layer of the fabric is made of hydrophobic filaments. The two filaments are double-sided woven by a weft knitting double-sided machine to obtain a double-sided knitted fabric.

[0031] The double-sided knitted fabric was pressurized at a pressure of 10 MPa for 10 s.

[0032] The fabric structure thus obtained is as Figure 1 As shown, the in-plane thermal conductivity of the fabric is about 8 W / (m·K), the out-of-plane thermal conductivity is about 0.5 W / (m·K), and the unidirectional moisture conductivity index is about 900%.

[0033] Example 2

[0034] A method for preparing a continuously cool textile with a 3D thermal conductive network comprises the following steps:

[0035] Boron nitride nanosheets are added to polyethylene terephthalate and cellulose acetate at a ratio of 1wt%, mixed evenly, and granulated in a granulator to obtain master batches, which are melted in a composite screw extruder, and the melt is injected into the spinneret of a spinning die through precise control of a metering pump, and the melt is extruded from the spinneret after screw pressure, and then stretched by a drafting roller, and the corresponding hydrophobic and hydrophilic filaments are obtained by spinning. The spinning process parameters of the hydrophobic filaments are: melting temperature 240-280°C, melt pressure 1MPa, and spinning speed 200m / min, and the fineness of the hydrophobic filaments obtained is about 7.5 dtex; the spinning process parameters of the hydrophilic filaments are: melting temperature 240-270°C, melt pressure 1MPa, and spinning speed 400m / min, and the fineness of the hydrophilic filaments obtained is about 5.5 dtex.

[0036] The outer layer of the fabric is made of hydrophilic filaments, and the inner layer of the fabric is made of hydrophobic filaments. The two filaments are double-sided woven by a weft knitting double-sided machine to obtain a double-sided knitted fabric.

[0037] The double-sided knitted fabric was pressurized at a pressure of 10 MPa for 10 s.

[0038] The fabric thus obtained has an in-plane thermal conductivity of about 6 W / (m·K), an out-of-plane thermal conductivity of about 0.4 W / (m·K), and a unidirectional moisture conductivity index of about 800%.

[0039] Example 3

[0040] A method for preparing a continuously cool textile with a 3D thermal conductive network comprises the following steps:

[0041] Boron nitride nanosheets are added to polyethylene and polyamide at a ratio of 5wt%, mixed evenly, and granulated in a granulator to obtain master batches, which are melted in a composite screw extruder, and the melt is injected into the spinneret of a spinning die through precise control of a metering pump. After the screw is pressurized, the melt is extruded from the spinneret, and then drawn by a drawing roller, and the corresponding hydrophobic and hydrophilic filaments are obtained by collecting. The spinning process parameters of the hydrophobic filaments are: melting temperature 150-180°C, melt pressure 0.8MPa, and collection speed 200m / min, and the fineness of the hydrophobic filaments obtained is about 6dtex; the spinning process parameters of the hydrophilic filaments are: melting temperature 260-270°C, melt pressure 2MPa, and collection speed 500m / min, and the fineness of the hydrophilic filaments obtained is about 4.5dtex.

[0042] The outer layer of the fabric is made of hydrophilic filaments, and the inner layer of the fabric is made of hydrophobic filaments. The two filaments are double-sided woven by a weft knitting double-sided machine to obtain a double-sided knitted fabric.

[0043] The double-sided knitted fabric was pressurized with a pressure of 5 MPa and a pressing time of 5 s.

[0044] The fabric thus obtained has an in-plane thermal conductivity of about 6 W / (m·K), an out-of-plane thermal conductivity of about 0.35 W / (m·K), and a unidirectional moisture conductivity index of about 850%.

[0045] Example 4

[0046] A method for preparing a continuously cool textile with a 3D thermal conductive network comprises the following steps:

[0047] 10wt% of carbon nanotubes are added to polyethylene and polyamide respectively, mixed evenly, and granulated in a granulator to obtain masterbatch, which is melted in a composite screw extruder, and the melt is injected into the spinneret of the spinning die through the precise control of the metering pump. After the screw is pressurized, the melt is extruded from the spinneret, and then stretched by a drafting roller, and the corresponding hydrophobic and hydrophilic filaments are obtained by winding. The spinning process parameters of the hydrophobic filament are: melting temperature 150-180℃, melt pressure 0.8MPa, winding speed 200m / min, and the fineness of the hydrophobic filament obtained is about 6dtex; the spinning process parameters of the hydrophilic filament are: melting temperature 260-270℃, melt pressure 1.5MPa, winding speed 400m / min, and the fineness of the hydrophilic filament obtained is about 5dtex.

[0048] The outer layer of the fabric is made of hydrophilic filaments, and the inner layer of the fabric is made of hydrophobic filaments. The two filaments are double-sided woven by a weft knitting double-sided machine to obtain a double-sided knitted fabric.

[0049] The double-sided knitted fabric was pressurized at a pressure of 7 MPa for 10 s.

[0050] The fabric thus obtained has an in-plane thermal conductivity of about 6.5 W / (m·K), an out-of-plane thermal conductivity of about 0.4 W / (m·K), and a unidirectional moisture conductivity index of about 750%.

[0051] The cool textile prepared by the present invention not only has a 3D heat-conducting network structure that can achieve instant heat dissipation and obtain a cool touch effect, but it can also conduct sweat to the surface of the fabric when the human body is constantly sweating due to heat, thereby evaporating and cooling, so it can achieve a continuous cool feeling.

[0052] Comparative Example

[0053] A method for preparing a cool feeling textile comprises the following steps:

[0054] Boron nitride nanosheets are added to polyethylene at a ratio of 1wt%, mixed evenly, and then granulated in a granulator to obtain masterbatch, which is melted in a composite screw extruder, and the melt is injected into the spinneret of a spinning die through precise control of a metering pump, and the melt is extruded from the spinneret after screw pressure, and then stretched by a drafting roller, and the hydrophobic filament is obtained by spinning. The spinning process parameters of the filament are: melt temperature 150-180°C, melt pressure 0.8MPa, winding speed 200m / min, and the fineness of the filament is about 6dtex.

[0055] The inner and outer layers of the fabric are both made of hydrophobic filaments. The double-sided knitted fabric is obtained by double-sided weaving using a weft knitting double-sided machine, that is, a finished textile product.

[0056] The in-plane thermal conductivity of the textile thus obtained is about 1W / (m·K), the out-of-plane thermal conductivity is about 0.1W / (m·K), and the unidirectional moisture conductivity index is only 150%. The textile cannot form a 3D thermal conductive network, cannot achieve fast and efficient heat conduction, and does not have a unidirectional moisture conduction function, and cannot achieve a continuous cool feeling.

Claims

1. A method for preparing a continuous cool feeling textile, characterized in that: The following steps are involved: Step 1: Add the thermally conductive particles to the hydrophobic polymer and the hydrophilic polymer respectively, mix them evenly, and then granulate them in a granulator to obtain masterbatches. The masterbatches are used to obtain the corresponding hydrophobic filaments and hydrophilic filaments through a melt spinning process; Step 2: The outer layer of the fabric uses the hydrophilic filaments obtained in step 1, and the inner layer of the fabric uses the hydrophobic filaments obtained in step 1, and a weft knitting double-sided machine is used to double-sidedly weave the two filaments to obtain a double-sided knitted fabric; Step 3: Use a hot press to pressurize the double-sided knitted fabric obtained in step 2 to obtain a continuous cooling textile having a 3D thermal conductive network structure.

2. The preparation method according to claim 1, characterized in that The thermally conductive particles in step 1 are selected from at least one of boron nitride, graphene, silicon nitride, aluminum nitride, silicon carbide, magnesium oxide, aluminum oxide, zinc oxide and carbon nanotubes.

3. The preparation method according to claim 1, characterized in that: The hydrophobic polymer in step 1 is selected from at least one of polyethylene terephthalate, polyethylene, polypropylene, polylactic acid, polyvinylidene fluoride, polyurethane, polysulfone, polyethersulfone, polyarylsulfone, polyphenylene sulfone, polymethyl methacrylate, polystyrene and styrene-methyl methacrylate copolymer resin; The hydrophilic polymer is at least one of cellulose acetate, chitosan, polyacrylonitrile, ethylene-vinyl alcohol copolymer, polyamide and polyimide.

4. The preparation method according to claim 1, characterized in that: The proportion of the thermally conductive particles added in step 1 is 1-10 wt %.

5. The preparation method according to claim 1, characterized in that: The process conditions of the pressurization treatment in step 3 are: the temperature of the hot press is set to room temperature, the pressure is 5 to 10 MPa, and the pressing time is 5 to 10 seconds.

6. A continuous cool feeling textile produced by the production method according to any one of claims 1 to 5.

7. Use of the continuous cool textile produced by the production method according to any one of claims 1 to 5 in the production of cool clothing and cool household items.

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