Method for preparing thermally conductive nonwoven fabric material for electric blanket

Abstract

The present invention provides a method for preparing a heat-conductive nonwoven fabric material for an electric blanket. The method comprises soaking a long-fiber needle-punched nonwoven fabric in a graphene impregnation solution and drying the resulting heat-conductive nonwoven fabric. The resulting heat-conductive nonwoven fabric not only forms a uniform graphene layer on both the upper and lower surfaces of the long-fiber needle-punched nonwoven fabric, but also impregnates the fiber surfaces connecting the upper and lower graphene layers within the needle-punched nonwoven fabric with graphene, thereby achieving thermal conductivity between the upper and lower graphene layers and effectively improving the thermal conductivity of the material. In addition, since the needle-punched nonwoven fabric uses long fibers and is hot-scalded before soaking, the surface frizziness is eliminated, effectively solving the serious linting problem of short-fiber needle-punched nonwoven fabrics in the past. The preparation method has the advantages of simple process, convenient operation, and low production cost. Moreover, the nonwoven fabric material obtained has good thermal conductivity and is not prone to linting.

Description

Technical Field

[0001] The present invention relates to the technical field of heat-conducting materials, and in particular to a method for preparing a heat-conducting non-woven fabric material for an electric blanket. Background Art

[0002] An electric blanket, also known as an electric mattress, is a contact-type electric heating device. It incorporates a specially designed, standard-insulation, soft-cord heating element woven or sewn into the blanket in a coiled pattern. The heating element generates heat when powered on. It's primarily used to heat the bed while sleeping and can also be used to remove moisture from bedding.

[0003] Existing electric heating pads are primarily composed of an anti-slip layer, a thermal insulation layer, a heating layer, a thermal conductivity layer, and a decorative layer or fabric layer. The anti-slip layer, which contacts the ground, prevents the electric blanket from moving around. The thermal insulation layer isolates the heat generated by the heating layer above it, preventing it from being transferred to the anti-slip layer and then dissipated to the ground, affecting the heating effect. The heating element in the heating layer is connected to an external power source to generate heat. The thermal conductivity layer quickly transfers the heat generated by the heating layer to the decorative layer or fabric layer to improve the heating efficiency and effect of the electric blanket. The decorative layer or fabric layer is mainly used for decoration and comes into direct contact with the human body. Therefore, while the heating elements are the same, the material selection of the thermal conductivity layer is crucial to the heating efficiency and effect of the electric blanket.

[0004] In the past, to improve the thermal conductivity of electric blankets, PET film + PCT ink layer or electric heating film was used as the thermal conductive layer. Although this method can improve thermal conductivity, it is relatively expensive. In addition, although non-woven fabrics have been used as linings in electric blankets in the past, they have always been short-fiber needle-punched non-woven fabrics, which not only have poor thermal conductivity and heat storage capabilities, but also have severe linting.

[0005] Therefore, how to develop a new type of non-woven fabric material that can effectively improve the heating efficiency and effect of electric blankets while effectively solving the serious problem of hair loss has become an urgent problem to be solved. Summary of the Invention

[0006] In view of this, the present invention provides a method for preparing a thermally conductive non-woven fabric material for an electric blanket, so as to improve the heating efficiency and effect of the electric blanket.

[0007] The technical solution provided by the present invention is specifically a method for preparing a thermally conductive nonwoven fabric material for an electric blanket, the method comprising the following steps:

[0008] Dry the polyester chips and masterbatch and set aside for use;

[0009] Put the dried polyester chips and masterbatch into a screw extruder, melt the polyester chips, extrude the melt, filter it, and set it aside;

[0010] The filtered polyester chip melt is poured into the spinning manifold and quantitatively transported by a metering pump;

[0011] The melt coming down from the metering pump is cooled into filaments and stretched by air traction;

[0012] The stretched silk is broken up by the swinging wire machine, adsorbed onto the transmission mesh curtain, and compacted by the pre-pressing roller;

[0013] The compacted mesh is passed through a first needling machine for repeated forward puncture to initially connect, and then a second needling machine is used for repeated reverse puncture to strongly lock the mesh to obtain a non-woven fabric;

[0014] The non-woven fabric is hot-ironed to remove the surface frizz, and then placed in the graphene impregnation solution for soaking;

[0015] The excess liquid in the soaked non-woven fabric is squeezed out and then dried to obtain the finished product.

[0016] Preferably, the graphene impregnation solution consists of the following components by weight percentage:

[0017] Graphene 0.1%-0.2%; binder 0.2%-0.3%; defoaming agent 0.04%-0.05%; antistatic agent 0.4%-0.5%; catalyst 0.1%-0.2%; and water as the balance.

[0018] More preferably, the adhesive is a polyacrylate adhesive.

[0019] More preferably, the defoaming agent is a silicone emulsion.

[0020] More preferably, the antistatic agent is an anionic surfactant.

[0021] More preferably, the catalyst is a salt compound.

[0022] More preferably, the needling depth of the first needling machine is 9.3-9.5 mm, and the needling depth of the second needling machine is 3.49-3.52 mm.

[0023] More preferably, the hot ironing temperature of the non-woven fabric for removing the surface frizz is 230°C.

[0024] Further preferably, the non-woven fabric after soaking is dried as follows:

[0025] The soaked non-woven fabric is pre-dried through a 140-150℃ drying drum;

[0026] The pre-dried non-woven fabric is passed through a drying drum at 155-165°C for drying;

[0027] The dried non-woven fabric is passed through a 115-125°C rotary mesh drying drum for drying and shaping.

[0028] In addition, the present invention also provides an electric blanket, which comprises, from bottom to top, an anti-slip layer, a heat insulation layer, a heating layer, a heat conductive layer and a decorative layer, wherein the heat conductive layer is made of the non-woven fabric material prepared by the above method.

[0029] The present invention provides a method for preparing a thermally conductive nonwoven fabric material for an electric blanket. The method comprises soaking a long-fiber needle-punched nonwoven fabric in a graphene impregnation solution and drying the resulting material. The resulting thermally conductive nonwoven fabric material not only forms a uniform graphene layer on both the upper and lower surfaces of the long-fiber needle-punched nonwoven fabric, but also impregnates the fiber surfaces connecting the upper and lower graphene layers within the needle-punched nonwoven fabric with graphene, thereby achieving thermal conductivity between the upper and lower graphene layers and effectively improving the thermal conductivity of the material. In addition, because the needle-punched nonwoven fabric uses long fibers and is hot-scalded before soaking, the surface frizziness is reduced, effectively solving the serious linting problem of short-fiber needle-punched nonwoven fabrics.

[0030] The method for preparing the heat-conductive non-woven fabric material for electric blankets provided by the present invention has the advantages of simple process, convenient operation, low production cost, etc., and the prepared non-woven fabric material has good thermal conductivity and is not easy to shed.

[0031] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further explained below with reference to specific embodiments, but this is not intended to limit the scope of protection of the present invention.

[0033] In order to solve the problem of high production cost when using PET film + PCT ink layer or electric heating film as the heat-conducting layer in the past electric blankets, if ordinary short-fiber needle-punched non-woven fabrics are used as substitutes, not only the heat-conducting and heat-storing capabilities are poor, but also the problem of easy linting. This embodiment provides a method for preparing a heat-conducting non-woven fabric material for an electric blanket. The non-woven fabric material prepared by this method can form graphene layers on the upper and lower surfaces, and the non-woven fabric fiber surface between the upper and lower graphene layers is also immersed in a graphene solution to form a graphene layer, so that the whole is in a conductive state, which can achieve a significant improvement in thermal conductivity. Using this non-woven fabric material as the heat-conducting layer of the electric blanket can not only achieve its purpose of efficient heat conduction, but also have a low production cost, which can effectively control the production cost of the electric blanket. At the same time, the non-woven fabric material is a long-fiber non-woven fabric material, which can also effectively solve the linting problem that has plagued people with short-fiber non-woven fabrics in the past.

[0034] The steps for preparing the above-mentioned thermally conductive nonwoven fabric material for electric blanket are as follows:

[0035] 1) Dry the polyester chips and masterbatch and set aside;

[0036] 2) Put the dried polyester chips and masterbatch into a screw extruder, melt the polyester chips, extrude the melt, filter it, and set it aside;

[0037] 3) Pour the filtered polyester chip melt into the spinning manifold and deliver it quantitatively through a metering pump;

[0038] 4) The melt coming down from the metering pump is cooled into filaments and stretched by air traction;

[0039] 5) The stretched silk is broken up by the swinging wire machine, adsorbed onto the transmission mesh curtain, and compacted by the pre-pressing roller;

[0040] 6) The compacted mesh is subjected to repeated forward puncture by a first needling machine for preliminary connection, and then subjected to repeated reverse puncture by a second needling machine for strong locking to obtain a nonwoven fabric;

[0041] 7) Hot-ironing the non-woven fabric to remove the surface roughness, and then soaking the non-woven fabric in the graphene dipping solution;

[0042] 8) Extruding excess liquid from the soaked nonwoven fabric and drying the nonwoven fabric to obtain a finished product.

[0043] In the above step 1), the polyester chips are dried, specifically:

[0044] The polyester chips are transported by the conveying system to the chip hopper for use in the crystallizer. The polyester chips fall into the pulsating bed from the chip hopper through the gate valve by their own weight. The chips stay in the crystallizer for 15-20 minutes, the crystallization temperature is 160-170℃, and the crystallization fan speed is 75-85r / min. The crystallized chips are continuously and evenly fed into the main drying tower and stay in the main drying tower for about 4-6 hours. The drying temperature is 160-170℃ and the dew point temperature is (-75 to -85)-89℃ to complete the drying.

[0045] In the above step 2), the dried polyester chips and masterbatch are put into a screw extruder, the polyester chips are melted, and then the melt is extruded. The whole extrusion process is divided into the following three stages:

[0046] 2.1) Feeding section

[0047] The dried solid polyester chips and masterbatch are sent to the compression section, where they are preheated by the heat transmitted from the screw sleeve. The air and other gases between the chips can be discharged into the hopper through the gaps.

[0048] 2.2) Compression section

[0049] The function of the compression section is to compact the slices. During this stage, the slices are transformed from solid to melt and the air between the slices is removed.

[0050] 2.3) Homogenization section

[0051] The molten chips are extruded quantitatively and stably to further enhance the melt shearing and mixing effects, and the chips and masterbatch are further homogenized.

[0052] Among them, in the screw extruder, the temperature of the cold zone is 45-55°C, the temperature of the heating zone is 280-290°C, and the speed of the screw press is 40-42 rpm.

[0053] In the above step 3), the filtered polyester chip melt is poured into the spinning manifold and quantitatively transported by a metering pump. The temperature of the spinning manifold is 280-300°C.

[0054] In the above step 4), the melt discharged from the metering pump is cooled into filaments and stretched by air traction. The melt is cooled by side wind cooling, wherein the side wind temperature is 25-30°C, the humidity is 85-90%, and the wind pressure is 20-30Pa; during the air traction, the side pressure on both sides is 5-6Bar.

[0055] In the above step 5), the stretched silk is broken up by a oscillating wire machine, adsorbed onto a transmission mesh curtain, and compacted by a pre-pressing roller. The oscillating frequency of the oscillating wire machine is 500-600 times / min, and the temperature of the pre-pressing roller is 150-160°C.

[0056] In the above step 6), the first needling machine and the second needling machine are respectively used to perform forward repeated puncture and reverse repeated puncture, which use needles with a triangular or other shaped cross-section and thorn grooves on the edges to repeatedly puncture the fiber web. The fiber web formed by airflow is fed into the pre-needling machine after being initially ironed and shaped by the pre-pressing roller. It only has a certain strength generated by the cohesion between the fibers, but the strength is very poor. When passing through the above-mentioned needling machine, when multiple needles pierce the fiber web, the fiber web is displaced up and down, which produces a certain squeeze on the fiber web, causing the fiber web to be close together and compressed. When the needle reaches a certain depth, the needle begins to rise. Due to the forward direction of the needle, the displaced fibers are separated from the thorn groove and remain in the fiber web in a vertical state, just like many fiber bundles pinned into the fiber web, so that the compression of the fiber web cannot be recovered. After dozens or hundreds of repeated punctures per square centimeter of the fiber web, a considerable number of fibers are pierced into the fiber web, the friction between the fibers in the fiber web is increased, the fiber web strength is increased, the density is increased, and the fiber web forms a non-woven fabric with certain strength, density, elasticity and other properties. Usually, the needling depth of the first needling machine is 9.3-9.5mm, and the needling density is 25-30c / cm 2 The second needling machine has a needling depth of 3.49-3.52 mm and a needling density of 25-30 c / cm 2 .

[0057] In step 7), the non-woven fabric is blanched to remove surface frizz, and then immersed in a graphene impregnation solution and lightly blanched at 230° C. to remove surface frizz and prevent hair loss. The graphene impregnation solution is composed of the following components by weight percentage:

[0058] Graphene 0.1%-0.2%; binder 0.2%-0.3%; defoaming agent 0.04%-0.05%; antistatic agent 0.4%-0.5%; catalyst 0.1%-0.2%; and water as the balance.

[0059] Among them, the adhesive is a polyacrylate adhesive, which is an auxiliary agent used to make the graphene and fiber bond more tightly and improve the feel; the defoaming agent is a silicone emulsion, which is used to prevent and reduce the formation of foam during the entire test process; the antistatic agent is Lurol AMD anionic surfactant; the catalyst is a salt compound purchased from Hangzhou Mick Placement Materials Co., Ltd.

[0060] Promote the cross-linking of resin and fiber, and reduce the reaction temperature and reaction time.

[0061] Taking a specific ratio of graphene impregnation liquid as an example, the specific preparation steps of the graphene impregnation liquid are explained: taking 1L as an example, add 2g of adhesive to 500nL of deionized water or distilled water, and stir to dissolve it; add 4.4g of antistatic agent, 1.5g of catalyst, and 0.4g of defoaming agent, and stir to mix and dissolve; then add 1.1g of graphene and stir to disperse it evenly.

[0062] In the above step 8), the excess liquid in the soaked non-woven fabric is squeezed out and then dried to obtain the finished product. The drying is specifically performed as follows:

[0063] The soaked non-woven fabric is pre-dried through a 140-150℃ drying drum;

[0064] The pre-dried non-woven fabric is passed through a drying drum at 155-165°C for drying;

[0065] The dried non-woven fabric is passed through a 115-125°C rotary mesh drying drum for drying and shaping.

[0066] The present invention is further explained below with reference to specific embodiments, but is not intended to limit the scope of protection of the present invention.

[0067] Example 1

[0068] 1) Polyester chips and masterbatch are transported to the chip hopper through the conveying system for use in the crystallizer. The chips fall into the pulsating bed through the gate valve by their own weight. The chips stay in the crystallizer for 18 minutes, the crystallization temperature is 165℃, and the crystallization fan speed is 80r / min. The crystallized chips are continuously and evenly fed into the main drying tower and stay in the main drying tower for about 5 hours. The drying temperature is 165℃ and the dew point temperature is 85℃. After drying, they are ready for use.

[0069] 2) Place the dried polyester chips and masterbatch into a screw extruder, heat to 285°C, melt the polyester chips, and extrude the melt at 42 rpm. Filter and set aside.

[0070] 3) Pour the filtered polyester chip melt into the spinning manifold at 290°C and deliver it quantitatively through a metering pump;

[0071] 4) The melt discharged from the metering pump is blown into filaments by side air cooling, wherein the side air temperature is 28°C, the humidity is 86%, and the air pressure is 25Pa, and the air flow is pulled and stretched under a side pressure of 5Bar on both sides;

[0072] 5) The stretched silk is broken up by a swing frequency of 550 times / min, adsorbed onto the transmission mesh curtain, and compacted by a pre-pressing roller at a temperature of 155°C;

[0073] 6) The compacted mesh is subjected to repeated forward puncture by a first needling machine for preliminary connection, and then subjected to repeated reverse puncture by a second needling machine for strong locking to obtain a non-woven fabric. The needling depth of the first needling machine is 9.4 mm and the needling density is 28 c / cm 2 The second needling machine has a needling depth of 3.5 mm and a needling density of 28 c / cm 2 ;

[0074] 7) The non-woven fabric is hot-ironed at 230° C. to remove the surface frizz, and then immersed in a graphene impregnation solution, wherein the graphene impregnation solution is prepared as follows: adding an adhesive to 50,000 nl of deionized water or distilled water and stirring to dissolve it; adding an antistatic agent, a catalyst, and a defoaming agent and stirring to dissolve them; then adding graphene and stirring to disperse it evenly, wherein the weight ratio of each component is: 0.25% adhesive, 0.44% antistatic agent, 0.15% catalyst, 0.04% defoaming agent, and 0.11% graphene.

[0075] 8) After the soaked non-woven fabric is passed through a squeeze roller to squeeze out excess liquid, the non-woven fabric is pre-dried through a drying drum at 140-150°C, then dried through a drying drum at 155-165°C, and finally dried and shaped through a rotary mesh drying drum at 115-125°C to obtain a finished product.

[0076] Comparative Example 1

[0077] 1) Polyester chips and masterbatch are transported to the chip hopper through the conveying system for use in the crystallizer. The chips fall into the pulsating bed through the gate valve by their own weight. The chips stay in the crystallizer for 18 minutes, the crystallization temperature is 165℃, and the crystallization fan speed is 80r / min. The crystallized chips are continuously and evenly fed into the main drying tower and stay in the main drying tower for about 5 hours. The drying temperature is 165℃ and the dew point temperature is 85℃. After drying, they are ready for use.

[0078] 2) Place the dried polyester chips and masterbatch into a screw extruder, heat to 285°C, melt the polyester chips, and extrude the melt at 42 rpm. Filter and set aside.

[0079] 3) Pour the filtered polyester chip melt into the spinning manifold at 290°C and deliver it quantitatively through a metering pump;

[0080] 4) The melt discharged from the metering pump is blown into filaments by side air cooling, wherein the side air temperature is 28°C, the humidity is 86%, and the air pressure is 25Pa, and the air flow is pulled and stretched under a side pressure of 5Bar on both sides;

[0081] 5) The stretched silk is broken up by a swing frequency of 550 times / min, adsorbed onto the transmission mesh curtain, and compacted by a pre-pressing roller at a temperature of 155°C;

[0082] 6) The compacted mesh is subjected to repeated forward puncture by a first needling machine for preliminary connection, and then subjected to repeated reverse puncture by a second needling machine for strong locking to obtain a non-woven fabric. The needling depth of the first needling machine is 9.4 mm and the needling density is 28 c / cm 2 The second needling machine has a needling depth of 3.5 mm and a needling density of 28 c / cm 2 ;

[0083] 7) placing the non-woven fabric in a graphene impregnation solution for immersion, wherein the graphene impregnation solution is prepared as follows: adding an adhesive to 50,000 nl of deionized water or distilled water and stirring to dissolve it; adding an antistatic agent, a catalyst, and a defoaming agent, stirring to mix and dissolve them; then adding graphene and stirring to disperse it evenly, wherein the weight ratio of each component is: 0.25% adhesive, 0.44% antistatic agent, 0.15% catalyst, 0.04% defoaming agent, and 0.11% graphene.

[0084] 8) After the soaked non-woven fabric is squeezed out of excess liquid through a squeezing roller, the non-woven fabric is pre-dried through a 140-150°C drying drum, then dried through a 155-165°C drying drum, and finally dried and shaped through a 115-125°C rotary mesh drying drum;

[0085] 9) The shaped non-woven fabric is hot-ironed at 230°C to remove the surface roughness to obtain the finished product.

[0086] Comparing the finished product prepared in Comparative Example 1 with the finished product prepared in Example 1, the surfaces of the non-woven fabric materials obtained by both are very smooth. However, since the graphene is impregnated and then blanched in Comparative Example 1, the subsequent blanching at 230°C will destroy the graphene coating structure formed on the non-woven fabric surface, affecting the subsequent thermal conductivity effect.

[0087] Comparative Example 2

[0088] 1) Polyester chips and masterbatch are transported to the chip hopper through the conveying system for use in the crystallizer. The chips fall into the pulsating bed through the gate valve by their own weight. The chips stay in the crystallizer for 18 minutes, the crystallization temperature is 165℃, and the crystallization fan speed is 80r / min. The crystallized chips are continuously and evenly fed into the main drying tower and stay in the main drying tower for about 5 hours. The drying temperature is 165℃ and the dew point temperature is 85℃. After drying, they are ready for use.

[0089] 2) Place the dried polyester chips and masterbatch into a screw extruder, heat to 285°C, melt the polyester chips, and extrude the melt at 42 rpm. Filter and set aside.

[0090] 3) Pour the filtered polyester chip melt into the spinning manifold at 290°C and deliver it quantitatively through a metering pump;

[0091] 4) The melt discharged from the metering pump is blown into filaments by side air cooling, wherein the side air temperature is 28°C, the humidity is 86%, and the air pressure is 25Pa, and the air flow is pulled and stretched under a side pressure of 5Bar on both sides;

[0092] 5) The stretched silk is broken up by a swing frequency of 550 times / min, adsorbed onto the transmission mesh curtain, and compacted by a pre-pressing roller at a temperature of 155°C;

[0093] 6) The compacted mesh is subjected to repeated forward puncture by a first needling machine for preliminary connection, and then subjected to repeated reverse puncture by a second needling machine for strong locking to obtain a non-woven fabric. The needling depth of the first needling machine is 9.4 mm and the needling density is 28 c / cm 2 The second needling machine has a needling depth of 3.5 mm and a needling density of 28 c / cm 2 ;

[0094] 7) The non-woven fabric is hot-ironed at 230° C. to remove the surface frizz, and then the graphene solution is sprayed on one surface of the non-woven fabric. The graphene impregnation solution is prepared as follows: the adhesive is added to 50,000 nL of deionized water or distilled water and stirred to dissolve; an antistatic agent, a catalyst, and a defoaming agent are added and stirred to dissolve; and the graphene is added and stirred to disperse evenly. The weight ratio of each component is: 0.25% adhesive, 0.44% antistatic agent, 0.15% catalyst, 0.04% defoaming agent, and 0.11% graphene.

[0095] 8) The sprayed non-woven fabric is passed through a drying drum at 140-150°C for pre-drying, and then passed through a drying drum at 155-165°C for drying. Finally, the dried non-woven fabric is passed through a rotary drying drum at 115-125°C for drying and shaping to obtain a finished product.

[0096] Comparing the finished product prepared in Comparative Example 2 with the finished product prepared in Example 1, the graphene solution spray in Comparative Example 2 cannot penetrate quickly, the cross-linking reaction of the slurry cannot reach the surface of the other layer, and the formation of a graphene coating on the unsprayed side cannot be ensured. The non-woven fabric cannot become an overall conductive heat conductor, and the thermal conductivity is greatly reduced.

[0097] Comparative Example 3

[0098] 1) Polyester chips and masterbatch are transported to the chip hopper through the conveying system for use in the crystallizer. The chips fall into the pulsating bed through the gate valve by their own weight. The chips stay in the crystallizer for 18 minutes, the crystallization temperature is 165℃, and the crystallization fan speed is 80r / min. The crystallized chips are continuously and evenly fed into the main drying tower and stay in the main drying tower for about 5 hours. The drying temperature is 165℃ and the dew point temperature is 85℃. After drying, they are ready for use.

[0099] 2) Place the dried polyester chips and masterbatch into a screw extruder, heat to 285°C, melt the polyester chips, and extrude the melt at 42 rpm. Filter and set aside.

[0100] 3) Pour the filtered polyester chip melt into the spinning manifold at 290°C and deliver it quantitatively through a metering pump;

[0101] 4) The melt discharged from the metering pump is blown into filaments by side air cooling, wherein the side air temperature is 28°C, the humidity is 86%, and the air pressure is 25Pa, and the air flow is pulled and stretched under a side pressure of 5Bar on both sides;

[0102] 5) The stretched silk is broken up by a swing frequency of 550 times / min, adsorbed onto the transmission mesh curtain, and compacted by a pre-pressing roller at a temperature of 155°C;

[0103] 6) The compacted mesh is subjected to a first needling machine for repeated forward puncture to initially connect, and then a second needling machine is used for repeated reverse puncture to strongly lock the mesh to obtain a non-woven fabric. The needling depth of the first needling machine is 10 mm and the needling density is 28 c / cm 2 The second needle loom has a needling depth of 4.11 mm and a needling density of 28 c / cm 2 ;

[0104] 7) The non-woven fabric is hot-ironed at 230° C. to remove the surface frizz, and then immersed in a graphene impregnation solution, wherein the graphene impregnation solution is prepared as follows: adding an adhesive to 50,000 nl of deionized water or distilled water and stirring to dissolve it; adding an antistatic agent, a catalyst, and a defoaming agent and stirring to dissolve them; then adding graphene and stirring to disperse it evenly, wherein the weight ratio of each component is: 0.25% adhesive, 0.44% antistatic agent, 0.15% catalyst, 0.04% defoaming agent, and 0.11% graphene.

[0105] 8) After the soaked non-woven fabric is passed through a squeeze roller to squeeze out excess liquid, the non-woven fabric is pre-dried through a drying drum at 140-150°C, then dried through a drying drum at 155-165°C, and finally dried and shaped through a rotary mesh drying drum at 115-125°C to obtain a finished product.

[0106] Comparing the finished product prepared in Comparative Example 3 with the finished product prepared in Example 1, in Comparative Example 3, the needle depth is deeper, the penetration into the fiber web is deeper, the entanglement and cohesion between the fibers are stronger, the fiber web is tighter, the thickness of the base cloth is correspondingly smaller, and the overall cloth is not fluffy enough. During the dipping treatment, the slurry penetration effect is poor, and the cross-linking reaction with the fibers is slow, which affects the later thermal conductivity effect.

[0107] Comparative Example 4

[0108] 1) Polyester chips and masterbatch are transported to the chip hopper through the conveying system for use in the crystallizer. The chips fall into the pulsating bed through the gate valve by their own weight. The chips stay in the crystallizer for 18 minutes, the crystallization temperature is 165℃, and the crystallization fan speed is 80r / min. The crystallized chips are continuously and evenly fed into the main drying tower and stay in the main drying tower for about 5 hours. The drying temperature is 165℃ and the dew point temperature is 85℃. After drying, they are ready for use.

[0109] 2) Place the dried polyester chips and masterbatch into a screw extruder, heat to 285°C, melt the polyester chips, and extrude the melt at 42 rpm. Filter and set aside.

[0110] 3) Pour the filtered polyester chip melt into the spinning manifold at 290°C and deliver it quantitatively through a metering pump;

[0111] 4) The melt discharged from the metering pump is blown into filaments by side air cooling, wherein the side air temperature is 28°C, the humidity is 86%, and the air pressure is 25Pa, and the air flow is pulled and stretched under a side pressure of 5Bar on both sides;

[0112] 5) The stretched silk is broken up by a swing frequency of 550 times / min, adsorbed onto the transmission mesh curtain, and compacted by a pre-pressing roller at a temperature of 155°C;

[0113] 6) The compacted mesh is subjected to repeated forward puncture by a first needling machine for preliminary connection, and then subjected to repeated reverse puncture by a second needling machine for strong locking to obtain a non-woven fabric. The needling depth of the first needling machine is 9.4 mm and the needling density is 28 c / cm 2 The second needling machine has a needling depth of 3.5 mm and a needling density of 28 c / cm 2 ;

[0114] 7) The non-woven fabric is hot-ironed at 230° C. to remove the surface frizz, and then immersed in a graphene impregnation solution, wherein the graphene impregnation solution is prepared as follows: adding an adhesive to 50,000 nl of deionized water or distilled water and stirring to dissolve it; adding an antistatic agent, a catalyst, and a defoaming agent and stirring to dissolve them; then adding graphene and stirring to disperse it evenly, wherein the weight ratio of each component is: 0.25% adhesive, 0.44% antistatic agent, 0.15% catalyst, 0.04% defoaming agent, and 0.05% graphene.

[0115] 8) After the soaked non-woven fabric is passed through a squeeze roller to squeeze out excess liquid, the non-woven fabric is pre-dried through a drying drum at 140-150°C, then dried through a drying drum at 155-165°C, and finally dried and shaped through a rotary mesh drying drum at 115-125°C to obtain a finished product.

[0116] Example 2

[0117] The nonwoven fabric materials prepared in Example 1 and Comparative Examples 1 to 4 were subjected to the following two tests to detect thermal conductivity:

[0118] 1) Using the cooling method, wrap two layers of sample in a 1000ml tall beaker filled with 1000ml of 90°C hot water. Record the time it takes for the temperature of the outer surface of the fabric to reach the same temperature as the water temperature in the beaker. After 10 minutes, record the water temperature in the beaker and the temperature of the outer surface of the fabric to determine the thermal conductivity of the sample. The blank group is a tall beaker with nothing wrapped in it.

[0119] Experimental conditions: room temperature 20-25°C, humidity 40-60%, no people moving around; the results are as follows:

[0120]

[0121]

[0122] 2) Cut the sample into strips 5 cm wide and 20 cm long, which are equivalent to wires. Connect one end to a battery and the other end to a light bulb. Observe the brightness of the light bulb to observe the dispersion and content of graphene on the fabric surface, which can also reflect its thermal conductivity. The brighter the light bulb, the better the electrical and thermal conductivity.

[0123] Sample name Bulb brightness Blank group Not bright Example 1 Bright Comparative Example 1 slightly bright Comparative Example 2 Very dark Comparative Example 3 Bright Comparative Example 4 Very dark

[0124] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0125] It should be understood that the present invention is not limited to the above description and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for preparing a thermally conductive nonwoven fabric material for an electric blanket, characterized in that: The steps include: Dry the polyester chips and masterbatch and set aside for use; Put the dried polyester chips and masterbatch into a screw extruder, melt the polyester chips, extrude the melt, filter it, and set it aside; The filtered polyester chip melt is poured into the spinning manifold and quantitatively transported by a metering pump; The melt coming down from the metering pump is cooled into filaments and stretched by air traction; The stretched silk is broken up by the swinging wire machine, adsorbed onto the transmission mesh curtain, and compacted by the pre-pressing roller; The compacted mesh is passed through a first needling machine for repeated forward puncture to initially connect, and then a second needling machine is used for repeated reverse puncture to strongly lock the mesh to obtain a non-woven fabric; The non-woven fabric is hot-ironed to remove the surface frizz, and then placed in the graphene impregnation solution for soaking; Excess liquid is squeezed out of the soaked non-woven fabric, and then dried to obtain a finished product; The graphene impregnation solution is composed of the following components by weight percentage: Graphene 0.1%-0.2%; Adhesive 0.2%-0.3%; Defoaming agent 0.04%-0.05%; Antistatic agent 0.4% -0.5%; catalyst 0.1%-0.2%; and the balance water.

2. The method for preparing the thermally conductive nonwoven fabric material for electric blanket according to claim 1, characterized in that: The adhesive is a polyacrylate adhesive.

3. The method for preparing the thermally conductive nonwoven fabric material for electric blanket according to claim 1, characterized in that: The defoaming agent is an organosilicon emulsion.

4. The method for preparing the thermally conductive nonwoven fabric material for electric blanket according to claim 1, characterized in that: The antistatic agent is an anionic surfactant.

5. The method for preparing the thermally conductive nonwoven fabric material for electric blanket according to claim 1, characterized in that: The catalyst is a salt compound.

6. The method for preparing the thermally conductive nonwoven fabric material for electric blanket according to claim 1, characterized in that: The needling depth of the first needling machine is 9.3-9.5 mm, and the needling depth of the second needling machine is 3.49-3.52 mm.

7. The method for preparing the thermally conductive nonwoven fabric material for electric blanket according to claim 1, characterized in that: The hot ironing temperature of the non-woven fabric to remove the surface frizz is 230°C.

8. The method for preparing the thermally conductive nonwoven fabric material for electric blanket according to claim 1, characterized in that: The drying of the nonwoven fabric after soaking is specifically as follows: The soaked non-woven fabric is pre-dried through a 140-150℃ drying drum; The pre-dried non-woven fabric is passed through a drying drum at 155-165°C for drying; The dried non-woven fabric is passed through a 115-125°C rotary mesh drying drum for drying and shaping.

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