A method for manufacturing a single-layer graphene oxide functional thermal insulation flake

Abstract

The invention discloses a method for preparing a single-layer graphene oxide functional thermal insulation flocculus, comprising the following steps: preparing raw materials, wherein the raw materials include ultrafine filling fibers, fine denier filling fibers A, fine denier filling fibers B, medium-coarse supporting filling fibers A, medium-coarse supporting filling fibers B, coarse denier supporting fibers and low-melting point bonding fibers; feeding the raw materials into a mixer for opening and premixing to obtain a preliminarily opened and mixed fiber mixture; feeding the premixed fibers into a fine opening machine for further opening and mixing; feeding the fibers into a carding machine for carding to make thin-layer fiber webs; cross-laying a plurality of thin-layer fiber webs; reinforcing a plurality of thin-layer fiber webs in a laid state; cutting and winding the finished product to obtain a rolled flocculus. The invention has reasonable process, reduces the occurrence of close clumping between ultrafine fibers by using a large amount of 1D-1.5D fine denier fibers, innovates the use method of far-infrared fibers, and enhances the thermal insulation performance of the flocculus.

Description

Technical Field

[0001] The invention relates to the technical field of textile materials, and in particular to a method for manufacturing a single-layer graphene oxide functional thermal insulation flake. Background Art

[0002] As a mainstream chemical fiber thermal insulation filling material for textile clothing, wadding is directly composed of loose fibers. The main differentiated fiber varieties used include three-dimensional curled fibers, hollow fibers, ultrafine fibers, etc.: 1) Ultrafine fiber wadding can form a porous and dense structure. While storing still air, it forms a fine network and tiny spaces in the wadding, effectively blocking the radiation heat dissipation of the human body and the convection heat conduction in the wadding; 3) On the contrary, three-dimensional curled fibers are a kind of spiral-shaped fiber material commonly used in wadding. The use of this fiber can form a relatively large space in the wadding, enhancing the fluffiness of the wadding. 3) DuPont of the United States imitated the hollow structure of polar bear hair to develop Thermolite hollow super thermal insulation fiber. DuPont cotton wadding uses this hollow fiber to increase the content of still air in the wadding through the internal pores of the fiber, thereby enhancing its thermal insulation performance.

[0003] However, while differentiated fibers have corresponding functions, they also have corresponding disadvantages. For example, the large proportion of ultrafine fibers used in flakes can easily lead to entanglement between ultrafine fibers during the combing process, resulting in defects in the flakes.

[0004] Various functional fibers and differentiated fibers have their own functions. The use of single-specification fibers cannot make the flakes reach the best state. Therefore, the combination of multiple fibers to integrate multiple functions is the design trend of new flakes. For example, Yang Yidan mentioned in the article "Development of Multi-component Functional Warm Nonwoven Materials" that the use of far-infrared hollow polyester fiber with cashmere and kapok fibers uses the curling, finer shape of cashmere fibers and the highly hollow characteristics of kapok to form a multi-component high-performance flake. Cashmere, kapok, far-infrared fibers and other raw materials are used in the flakes, trying to make the flakes combine the advantages of several materials. For example, the addition of far-infrared fibers will give the flakes the function of far-infrared emission.

[0005] The far-infrared functional components in the far-infrared functional fiber can effectively absorb and emit energy in the far-infrared band. Among them, the far-infrared absorption function of the fiber can enable the floccules to block heat from the human body and radiate it to the external environment through the floccules in the form of far-infrared radiation, playing a warming role; at the same time, the far-infrared generation function of the fiber can enable the floccules to emit far-infrared energy to the human body, playing a warming and health-care role for the human body.

[0006] However, there are deficiencies in the use of far-infrared fibers in existing far-infrared flakes. For example, in the article "Development of Multi-component Functional Thermal Nonwoven Materials", 20% of single-specification far-infrared fibers with a length of 64 mm and a fineness of 3.33 dtex are added to the flakes. For another example, in recent years, in patents such as "A Thermal Insulation Cotton with Far-Infrared Heating Function", "A Far-Infrared Thermal Insulation Flame Retardant Functional Flake and Its Preparation Method" and "A Porous Lightweight Sprayed Cotton", far-infrared fibers or far-infrared materials are used as one layer of multi-layer composite flakes. Similar simple addition or single-layer composite usage methods cannot better exert the thermal insulation function of far-infrared fibers, because these methods cannot enable far-infrared fibers to effectively play the role of preventing radiation heat dissipation in flakes.

[0007] The functional components of common far-infrared functional fibers are the metal or non-metal oxide ceramic particles contained therein. Compared with common infrared functional fibers and other far-infrared fibers, the far-infrared emission and absorption bands of the single-layer graphene oxide composite fiber are highly overlapped with the far-infrared emission bands of the human body. Using it in textiles and clothing products can more effectively prevent far-infrared radiation heat dissipation and far-infrared health care.

[0008] In summary, the currently popular multi-component flakes have two defects: 1) The microfibers often clump and tangle, which is due to their large specific surface area and many contact points. When the microfibers are added in large amounts, they are difficult to comb or re-clump and tangle, which weakens their warmth-keeping function; 2) The use of far-infrared functional fibers only plays their far-infrared emission function, and cannot effectively play their warmth-keeping function of preventing radiation heat dissipation. In response to the above problems, a solution is proposed below. Summary of the invention

[0009] The purpose of the present invention is to provide a method for preparing a single-layer graphene oxide functional thermal insulation flake, which has the advantage of being able to solve the phenomenon of ultrafine fiber clumping and entanglement in multi-component fibers, and innovatively use far-infrared fibers to better play the role of thermal insulation.

[0010] The above technical objectives of the present invention are achieved through the following technical solutions:

[0011] A method for preparing a single-layer graphene oxide functional thermal insulation flake comprises the following steps:

[0012] S1: preparing raw materials, the raw materials including ultrafine filling fiber, fine denier filling fiber A, fine denier filling fiber B, medium-coarse supporting filling fiber A, medium-coarse supporting filling fiber B, coarse denier supporting fiber and low melting point bonding fiber;

[0013] S2: feeding the raw materials into a mixer for opening and premixing to obtain a preliminarily opened and preliminarily mixed fiber mixture;

[0014] S3: The pre-mixed fibers are fed into a fine opener, where the fibers are further opened and fully mixed;

[0015] S4: sending the fully mixed fiber aggregate into a carding machine for carding, and the carding machine carding the fiber aggregate into a thin fiber web;

[0016] S5: cross-laying a plurality of thin webs to form a stacked state, wherein the stacked thin webs have 2 to 8 layers;

[0017] S6: The stacked multiple thin webs are subjected to a reinforcement process, the reinforcement process includes spraying a chemical adhesive and drying, the chemical adhesive is used to form a bond between the multiple thin webs, the drying process is carried out in an oven, the drying temperature is 110°C-130°C, the drying time is 3-8min, and a finished flake is obtained, the gram weight of the finished flake is 80-300g;

[0018] S7: cutting and winding the finished flakes to obtain rolled flakes.

[0019] Preferably, the ultrafine filling fiber is polyester fiber, and the ultrafine filling fiber has a circular cross-section; the fine denier filling fiber A is graphene polyester fiber, and the fine denier filling fiber A has a circular hollow cross-section; the fine denier filling fiber B is graphene polyester fiber, and the fine denier filling fiber B has a circular hollow cross-section; the medium-coarse supporting filling fiber A is graphene polyester fiber, the medium-coarse supporting filling fiber A has a circular hollow cross-section, and the medium-coarse supporting filling fiber is three-dimensionally curled; the medium-coarse supporting filling fiber B is polyester fiber, the medium-coarse supporting filling fiber B has a circular hollow cross-section, and the medium-coarse supporting filling fiber is three-dimensionally curled; the coarse denier supporting fiber is polyester fiber, the coarse denier supporting fiber has a circular hollow cross-section, and the coarse denier supporting fiber is three-dimensionally curled; the low-melting point bonding fiber is ES fiber, the low-melting point bonding fiber has a circular cross-section, and the low-melting point bonding fiber has a skin-core structure.

[0020] Preferably, the ratio of the ultrafine filling fiber, fine denier filling fiber A, fine denier filling fiber B, medium coarse supporting filling fiber A, medium coarse supporting filling fiber B, coarse denier supporting fiber and low melting point bonding fiber is 10%-20%: 10%-20%: 10%-20%: 10%-15%: 10%-20%: 10%-15%: 10%-20%: 10%-20%.

[0021] Preferably, the fineness range of the ultrafine filling fiber is 0.5-1D, and the length range of the ultrafine filling fiber is 38mm-51mm.

[0022] Preferably, the fineness range of the fine denier filling fiber A is 1D-1.5D, and the length range of the fine denier filling fiber A is 38mm-51mm; the fineness range of the fine denier filling fiber B is 1D-1.5D, and the length range of the fine denier filling fiber B is 38mm-51mm.

[0023] Preferably, the fineness range of the medium-coarse supporting filling fiber A is 2D-5D, and the length range of the medium-coarse supporting filling fiber A is 51mm-64mm; the fineness range of the medium-coarse supporting filling fiber B is 2D-5D, and the length range of the medium-coarse supporting filling fiber B is 51mm-64mm.

[0024] Preferably, the fineness range of the coarse denier support fibers is 5D-7D, and the length range of the coarse denier support fibers is 51 mm-64 mm.

[0025] Preferably, the fineness range of the low-melting point bonding fiber is 2D-5D, and the length range of the low-melting point bonding fiber is 38mm-64mm.

[0026] Preferably, the thermal insulation flakes are used for filling quilts, clothing and sleeping bags.

[0027] The beneficial effects of the present invention are:

[0028] 1. Compared with conventional wadding, a large amount of 1D-1.5D fine denier fibers are used to reduce the tight clumping between ultrafine fibers, thus enhancing the warmth retention performance of the wadding;

[0029] 2. 1D-1.5D fine denier graphene fibers account for 30% of the flakes, plus 3D medium-coarse graphene fibers, a total of 50% of the graphene fibers are evenly and densely distributed inside the flakes, which can effectively slow down the radiation heat transfer inside the flakes and increase the thermal insulation performance of the flakes. DETAILED DESCRIPTION

[0030] The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention.

[0031] Single-layer graphene oxide functional thermal insulation flakes with a gram weight of 80g / ㎡ (Note: In the design, flakes with a lower gram weight are thinner in thickness. In order to ensure the fluffiness, we tend to choose coarser raw materials, so 70% of the fiber fineness is greater than 1.5D).

[0032] 1. Weigh the raw materials according to the following ratio:

[0033] 1) Ultrafine filling fiber: 0.7D51mm polyester fiber, circular cross section, accounting for 10%;

[0034] 2) Fine denier filling fiber: 1.2D51mm graphene polyester fiber, circular hollow cross-section, accounting for 10%;

[0035] 3) Fine denier filling fiber: 1.5D51mm graphene polyester fiber, circular hollow cross-section, accounting for 10%;

[0036] 4) Medium-thick supporting filling fiber: 3.0D64mm graphene polyester fiber, circular hollow cross-section, three-dimensional curling, accounting for 15%;

[0037] 5) Medium-thick supporting filling fiber: 5.0D64mm polyester fiber, round hollow cross-section, three-dimensional curling, accounting for 20%;

[0038] 6) Coarse denier support fiber: 7.0D64mm polyester fiber, circular hollow cross-section, three-dimensional curling, accounting for 15%;

[0039] 7) Low melting point bonding fiber: 4.0D64mm ES fiber, circular cross section, skin-core structure, accounting for 20%;

[0040] 2. Process steps

[0041] 1) After all the raw materials are weighed, they are sent to a mixer for opening and pre-mixing to obtain a preliminarily opened and preliminarily mixed fiber mixture.

[0042] 2) The pre-mixed fibers are fed into the fine opening machine, where they are further opened and fully mixed.

[0043] 3) After being fully mixed, the fibers of various specifications in the fiber aggregate are basically evenly distributed. After passing through the feeder, the fibers are sent to the carding machine.

[0044] 4) The carding process is completed by two single-cylinder double-doffer carding machines, which card the fiber aggregate into a thin layer of fiber web, and the output fiber weight is 40g / ㎡. The fibers in the fiber web are carded into fully dispersed single fibers and further evenly mixed for subsequent web laying.

[0045] 5) The two layers of fiber web are cross-laid to form a stacked state and enter the reinforcement process.

[0046] In the reinforcement process, the flakes are sprayed with chemical adhesive by a sprayer, and the amount of spraying is 2g / ㎡. After the drying in the oven, the chemical fiber adhesive and the low melting point fiber bonding fiber form a bond between the fibers inside the flakes, and the flakes form a certain strength and fixed shape. The drying temperature of the oven is 110℃, and the drying time is 3min.

[0047] The weight of the formed flakes is 80g / ㎡.

[0048] 3. Test results

[0049] Thermal insulation performance: GB / T 11048-2008 was used to test the thermal insulation performance of the wadding. The test results showed that the clo value of 80g single-layer graphene oxide thermal insulation wadding reached 1.9clo, while that of ordinary 80g thermal insulation wadding was only 1.4clo. It can be seen that the thermal insulation performance of single-layer graphene oxide thermal insulation wadding is much higher than that of conventional wadding.

[0050] A single-layer graphene oxide functional thermal insulation flakes with a gram weight of 300g / ㎡ (since high-weight flakes tend to be too thick, the design tends to select finer fiber raw materials, and 60% of the fiber fineness does not exceed 1.5D).

[0051] 1. Weigh the raw materials according to the following ratio:

[0052] 1) Ultrafine filling fiber: 0.5D51mm polyester fiber, circular cross section, accounting for 20%;

[0053] 2) Fine denier filling fiber: 1.0D51mm graphene polyester fiber, circular hollow cross-section, accounting for 20%;

[0054] 3) Fine denier filling fiber: 1.2D51mm graphene polyester fiber, circular hollow cross-section, accounting for 20%;

[0055] 4) Medium-thick supporting filling fiber: 2.0D64mm graphene polyester fiber, circular hollow cross-section, three-dimensional curling, accounting for 10%;

[0056] 5) Medium-thick supporting filling fiber: 3.0D64mm polyester fiber, round hollow cross-section, three-dimensional curling, accounting for 10%;

[0057] 6) Coarse denier support fiber: 5.0D64mm polyester fiber, circular hollow cross-section, three-dimensional curling, accounting for 10%;

[0058] 7) Low melting point bonding fiber: 2.0D64mm ES fiber, circular cross section, skin-core structure, accounting for 10%;

[0059] 2. Process steps

[0060] 1) After all the raw materials are weighed, they are sent to a mixer for opening and pre-mixing to obtain a preliminarily opened and preliminarily mixed fiber mixture.

[0061] 2) The pre-mixed fibers are fed into the fine opening machine, where they are further opened and fully mixed.

[0062] 3) After being fully mixed, the fibers of various specifications in the fiber aggregate are basically evenly distributed. After passing through the feeder, the fibers are sent to the carding machine.

[0063] 4) The carding process is completed by 5 single-cylinder double-doffer carding machines, which card the fiber aggregate into a thin layer of fiber web, and the output fiber weight is 60g / ㎡. The fibers in the fiber web are carded into fully dispersed single fibers and further evenly mixed for subsequent web laying.

[0064] 5) The five layers of fiber web are cross-laid to form a stacked state and enter the reinforcement process.

[0065] In the reinforcement process, the flakes are sprayed with chemical adhesive by a sprayer, and the spraying amount is 6g / ㎡. After the drying in the oven, the chemical fiber adhesive and the low melting point fiber bonding fiber form a bond between the fibers inside the flakes, and the flakes form a certain strength and fixed shape. The drying temperature of the oven is 130℃, and the drying time is 8min.

[0066] The weight of the formed flakes is 300g / ㎡.

[0067] 3. Test results

[0068] Thermal insulation performance: GB / T 11048-2008 was used to test the thermal insulation performance of the wadding. The test results showed that the clo value of 300g single-layer graphene oxide thermal insulation wadding reached 5.3clo, while that of ordinary 300g thermal insulation wadding was only 4.1clo. It can be seen that the thermal insulation performance of single-layer graphene oxide thermal insulation wadding is much higher than that of conventional wadding.

[0069] Working principle: 3D-6D coarse denier three-dimensional curled hollow fibers account for 40%, supporting the relatively large void structure inside the flakes. If a large amount of 1D-1.5D fine denier fibers are not added, the ultrafine fibers that account for a relatively high proportion will be entangled and clumped due to close contact and connection. Therefore, in the formula design, 30% of 1D-1.5D fine denier fibers are added. Compared with 3D or 6D fibers, they can effectively increase the specific surface area inside the flakes, fully contact and connect with 0.7D ultrafine fibers, and form tiny gaps at the same time, increasing the spacing between ultrafine fibers and significantly reducing the self-entanglement of ultrafine fibers. In this way, the ultrafine fibers are fully dispersed and evenly distributed in the flakes, each layer of the fiber mesh is fine and uniform, and uniform and fine gaps are formed inside the flakes as a whole. Only weak air convection is generated in the tiny gaps, which prevents large-scale convection inside the flakes and can effectively slow down the convective heat transfer inside the flakes. In addition, the fine fiber mesh absorbs and reflects the heat radiation inside the flakes, which can better block the radiation heat transfer inside the flakes and increase the thermal insulation performance of the flakes.

[0070] Inside the flakes, heat is transferred from the high-temperature inner side to the relatively low-temperature outer side in the form of far-infrared radiation. Graphene fibers can effectively absorb far-infrared radiation, and they are evenly distributed in the flakes together with ordinary polyester fibers. The flakes contain graphene fibers of multiple fineness specifications, including 1.2D, 1.5D and 3D, so that the graphene fibers are evenly, densely and widely distributed in the fiber web. Compared with other flakes that add a single specification of far-infrared fibers or add graphene components in a single-layer composite form, the graphene functional thermal insulation flakes can form a high-efficiency absorption of thermal radiation at all internal positions, thereby significantly slowing down the radiation heat transfer inside the flakes.

[0071] The flakes of this product can be used to fill quilts, clothing, sleeping bags and other warm-keeping products. In addition to keeping warm, this product also has the main functions of far-infrared health care, negative ion generation, antibacterial, and anti-mite.

[0072] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a single-layer graphene oxide functional thermal insulation flake, characterized in that: The following steps are included: S1: preparing raw materials, the raw materials including ultrafine filling fiber, fine denier filling fiber A, fine denier filling fiber B, medium-coarse supporting filling fiber A, medium-coarse supporting filling fiber B, coarse denier supporting fiber and low melting point bonding fiber; S2: feeding the raw materials into a mixer for opening and premixing to obtain a preliminarily opened and preliminarily mixed fiber mixture; S3: The pre-mixed fibers are fed into a fine opener, where the fibers are further opened and fully mixed; S4: sending the fully mixed fiber aggregate into a carding machine for carding, and the carding machine carding the fiber aggregate into a thin fiber web; S5: cross-laying a plurality of thin webs to form a stacked state, wherein the stacked thin webs have 2 to 8 layers; S6: reinforcing the multiple thin webs in the stacked state, the reinforcing comprising spraying a chemical adhesive and drying, the chemical adhesive being used to form a bond between the multiple thin webs, the drying process being carried out in an oven, the drying temperature being 110° C.-130° C., the drying time being 3-8 min, and obtaining a finished flake, the gram weight of the finished flake being 80-300 g; S7: cutting and winding the finished flakes to obtain rolled flakes; The ultrafine filling fiber is polyester fiber, and the ultrafine filling fiber has a circular cross-section; the fine denier filling fiber A is graphene polyester fiber, and the fine denier filling fiber A has a circular hollow cross-section; the fine denier filling fiber B is graphene polyester fiber, and the fine denier filling fiber B has a circular hollow cross-section; the medium-coarse supporting filling fiber A is graphene polyester fiber, and the medium-coarse supporting filling fiber A has a circular hollow cross-section, and the medium-coarse supporting filling fiber has a three-dimensional curling shape; the medium-coarse supporting filling fiber B is polyester fiber, and the medium-coarse supporting filling fiber B has a circular hollow cross-section, and the medium-coarse supporting filling fiber has a three-dimensional curling; the coarse denier supporting fiber is polyester fiber, and the coarse denier supporting fiber has a circular hollow cross-section, and the coarse denier supporting fiber has a three-dimensional curling; the low-melting point bonding fiber is ES fiber, and the low-melting point bonding fiber has a circular cross-section, and the low-melting point bonding fiber has a skin-core structure; The ratio of the ultrafine filling fiber, fine denier filling fiber A, fine denier filling fiber B, medium coarse supporting filling fiber A, medium coarse supporting filling fiber B, coarse denier supporting fiber and low melting point bonding fiber is 10%-20%: 10%-20%: 10%-20%: 10%-15%: 10%-20%: 10%-15%: 10%-20%; The fineness range of the ultrafine filling fiber is 0.5-1D, and the length range of the ultrafine filling fiber is 38mm-51mm; The fineness range of the fine denier filling fiber A is 1D-1.5D, and the length range of the fine denier filling fiber A is 38mm-51mm; The fineness range of the fine denier filling fiber B is 1D-1.5D, and the length range of the fine denier filling fiber B is 38mm-51mm; The fineness range of the medium-thick supporting filling fiber A is 2D-5D, and the length range of the medium-thick supporting filling fiber A is 51mm-64mm; The fineness range of the medium-thick supporting filling fiber B is 2D-5D, and the length range of the medium-thick supporting filling fiber B is 51mm-64mm; The fineness range of the coarse denier support fiber is 5D-7D, and the length range of the coarse denier support fiber is 51mm-64mm; The fineness range of the low-melting point bonding fiber is 2D-5D, and the length range of the low-melting point bonding fiber is 38mm-64mm.

2. The method for preparing a single-layer graphene oxide functional thermal insulation flake according to claim 1, characterized in that: The thermal insulation flakes are used for filling quilts, clothes and sleeping bags.