Polyester fiber / polyesteramide fiber multilayer composite warm-keeping flocculus and production process thereof

Abstract

The invention discloses a polyester fiber / polyesteramide fiber multilayer composite warm-keeping flocculus which is composed of an upper-layer fiber net, a middle-layer fiber net and a lower-layer fiber net, the upper-layer fiber net and the lower-layer fiber net are both prepared from a first fiber net, and the middle-layer fiber net is formed by stacking and reinforcing the first fiber net and a second fiber net. The production process comprises the following steps: 1, preparing an upper-layer fiber web and a lower-layer fiber web, 2, preparing a middle-layer fiber web, and laminating and compounding the first fiber web and the second fiber web; 3, fiber web stacking and reinforcing, wherein first fiber webs are stacked on the upper surface and the lower surface of the middle-layer fiber web respectively, and needling reinforcing is conducted after stacking is completed; and carrying out hot air bonding reinforcement under the condition of 160 DEG C, trimming, sterilizing, rolling and packaging to obtain the polyester fiber / polyesteramide fiber multi-layer composite warm-keeping flocculus. The moisture absorption, moisture conductivity and air permeability of the flocculus are improved, and the overall heat preservation performance of the flocculus is enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal insulation filling materials, and in particular relates to a polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flake and a production process thereof. Background Art

[0002] Nowadays, in the field of home textiles and clothing, flakes have been widely used in the production of clothing, home textiles and bedding, and have become a common filling material. Thermal flakes are flakes made of natural or synthetic fibers, which have good thermal insulation performance and softness, can effectively keep the human body warm, and mainly play a role in keeping warm. Flakes of different materials give products different functions. With the increasing demand for functional clothing, the market size of thermal flakes is also expanding. Thermal flakes can be divided into natural fiber thermal flakes and chemical fiber thermal flakes. Natural fiber thermal flakes are mainly made of animal fibers (such as wool, rabbit hair, etc.) and plant fibers (such as cotton, silk, etc.), with good thermal insulation and environmental protection performance, but the price is relatively high. Chemical fiber thermal flakes are mainly made of chemical synthetic materials such as polyester fibers and polyamide fibers. The price is relatively low, but the thermal insulation performance is slightly inferior to that of natural fiber thermal flakes. In particular, the three-dimensional hollow polyester fiber in the polyester fiber flakes is widely used because of its good thermal insulation properties.

[0003] Polyester fiber flakes are loose fiber structure flakes made of polyester fibers. They have the characteristics of high strength, corrosion resistance, good fluffiness, and affordable price. They have become the mainstream filling material widely used in a series of cold-proof products such as cold-proof clothing and cold-proof quilts. The raw materials of warm flakes in the market are mostly polyester fibers. The application field of high-performance fiber flake products is expanding year by year, and the military and civilian markets are vast. Although polyester fiber has many advantages, it also has some defects. As a filling material, it has a poor feel and poor hydrophilic moisture conduction performance, resulting in low breathability and moisture permeability, thus affecting the wearing and use experience of clothing and quilts. In addition, traditional polyester fiber flakes often have a single function, and the moisture conduction of polyester fibers is not good, and there is a certain sense of stuffiness. Therefore, in order to improve the above-mentioned defects of polyester fibers and improve the comprehensive physical properties of warm flakes, cotton fibers, polyester staple fibers, hollow fibers, fine deniers and ultrafine denier fibers are often added to polyester fibers to make up for each other's deficiencies and improve the comprehensive performance of warm flakes. At present, the warm flake technology related to polyester fibers mainly includes the following contents:

[0004] CN101718024A discloses a thermal insulation flake and a manufacturing method thereof, which is made of 20-80% (by weight) of ultrafine denier fibers, 10-70% (by weight) of fine denier fibers, 5-30% (by weight) of bonding fibers and 0-5% (by weight) of adhesives. The thermal insulation flake is made by the following method: various fiber raw materials are loosened and mixed; then they are combed and laid to form a fiber web; then the fiber web is randomly drafted to form a three-dimensional mesh cross structure; then the adhesive is sprayed on both sides of the fiber web; then the fiber web is heated and baked to make the bonding fibers bond the fibers around it and solidify the adhesive at the same time. In the present invention, the use of ultrafine denier fibers and fine denier fibers can effectively reduce heat conduction, prevent or reduce air convection in the space, and improve the warmth retention of the thermal insulation flake; the use of bonding fibers and adhesives can improve the fluffiness and compression resilience of the thermal insulation flake; after random drafting, the fluffiness and compression resilience of the thermal insulation flake are higher.

[0005] CN117587575A discloses a fluffy warm-keeping flake and a manufacturing method thereof, which is composed of an upper layer, a middle layer and a lower layer, wherein the upper layer and the lower layer both contain the following mass fractions of fibers: 8-9 parts of fine-denier hollow fibers, 1-2 parts of low-melting-point fibers; the middle layer contains the following mass fractions of fibers: 3-6 parts of 10D-15D hollow three-dimensional fibers, 0-3 parts of 5D-7D hollow three-dimensional fibers, 3-4 parts of 2D-3D hollow three-dimensional fibers, and 1-2 parts of low-melting-point fibers. The flake of the present invention has the advantages of higher fluffiness and better warmth retention performance.

[0006] CN 221797834 U discloses a composite structure thermal insulation flake, which comprises an upper fine denier hollow fiber layer, an intermediate mixed hollow fiber layer and a lower fine denier hollow fiber layer from top to bottom, wherein the intermediate mixed hollow fiber layer is formed by combing and mixing hollow fibers of different thicknesses with a diameter range of 2D-15D. The composite structure thermal insulation flake of the utility model has the advantages of delicate hand feeling and good thermal insulation effect.

[0007] It can be seen from the above patent technology that the current research direction of thermal insulation flakes is mainly to further enhance the thermal insulation performance of flakes by utilizing the different functions of different fibers, such as reducing heat conduction, increasing fluffiness, or preventing and reducing the air flow in the gaps between fibers through the structure of the composite layer, and enhancing the thermal insulation performance by improving the temperature lock effect. However, the current technology for improving the thermal insulation performance in the field of thermal insulation flakes ignores an important factor, that is, how to further increase the cavity structure inside the flakes, reduce the density of the fibers, and improve the moisture absorption, moisture conduction and air permeability of the flakes while ensuring that the flakes have excellent fluffiness, elasticity, and resilience. First of all, in order to effectively lock in air and reduce heat loss, thermal insulation flakes often have a higher air layer thickness, which leads to a larger overall thickness of the flakes, low air circulation performance, and poor moisture absorption and moisture conduction performance; at the same time, fiber materials with poor hygroscopicity will cause a significant decrease in thermal insulation performance after being damp. Specifically, when the fiber material absorbs water, its thermal conductivity will increase, making it easier for heat to be lost through the fiber material, resulting in a decrease in the thermal insulation effect. In addition, materials with poor hygroscopicity will lose volume and fluffiness when exposed to moisture, further affecting the thermal insulation performance. Secondly, although high fiber density can increase air retention and reduce air circulation, effectively locking in temperature and reducing heat loss, it also reduces moisture conduction and air permeability, thus affecting the thermal insulation effect of the wadding.

[0008] Therefore, how to further improve the moisture absorption, moisture conduction and air permeability of the flocs and enhance the overall thermal insulation performance of the flocs on the basis of the existing flocs having certain fluffiness, elasticity and resilience, effectively locking air and reducing heat loss, has become a difficult problem that technicians in the field of floc filling materials urgently need to solve. Summary of the invention

[0009] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flake and its production process, which can increase the cavity structure inside the flake, reduce the density of the fiber, effectively improve the moisture absorption, moisture conduction and air permeability of the flake, and enhance the overall thermal insulation performance of the flake.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is: a polyester fiber / polyamide ester fiber multilayer composite thermal insulation flocculent sheet, which is composed of an upper fiber web, a middle fiber web and a lower fiber web, wherein the upper and lower fiber webs are both prepared from a first fiber web, and the middle fiber web is formed by laminating and consolidating the first fiber web and the second fiber web, wherein:

[0011] The first fiber web is formed by mixing the following fibers in parts by weight:

[0012] 1-3 parts of low melting point polyester fiber;

[0013] 2-6 parts of polyamide polyester fiber;

[0014] 2-7 parts of ultra-fine polyester fiber;

[0015] The second fiber web is formed by mixing the following fibers in parts by weight:

[0016] 2-4 parts of polyamide polyester fiber;

[0017] 2-6 parts of polyester fiber containing rare earth elements;

[0018] 2 to 5 parts of three-dimensional hollow polyester fibers.

[0019] In the above-mentioned polyester fiber / polyamide ester fiber multi-layer composite thermal insulation batting, the mass proportion of the upper fiber web and the lower fiber web in the batting is 10% to 25% respectively, and the mass proportion of the middle fiber web is 50% to 80%.

[0020] The above-mentioned polyester fiber / polyamide ester fiber multilayer composite thermal insulation flocculent sheet, the surface density of the first fiber web is 15-40g / m 2 The surface density of the second fiber web is 30 to 300 g / m 2 .

[0021] In the above-mentioned polyester fiber / polyamide ester fiber multi-layer composite thermal insulation sheet, in the first fiber web, the low-melting point polyester fiber has a melting point of 110-130°C, a fineness of 0.9-2.0 dtex, the fineness of the polyamide ester fiber is 1.0-3.0 dtex, the fiber cross-section is cross-shaped or H-shaped, and the ultrafine denier polyester fiber has a fineness of 0.5-0.8 dtex and a circular cross-section.

[0022] In the above-mentioned polyester fiber / polyamide ester fiber multilayer composite thermal insulation sheet, in the second fiber web, the fineness of the polyamide ester fiber is 1.0~3.0dtex, the fiber cross-section is cross-shaped or H-shaped, the fineness of the rare earth element-containing polyester fiber is 1.0~3.0dtex, the fineness of the three-dimensional hollow polyester fiber is 3.0~12dtex, and the structure is porous hollow.

[0023] In the above-mentioned polyester fiber / polyamide ester fiber multilayer composite thermal insulation flocculent sheet, the mass fraction of cerium, neodymium oxide or compound nanoparticles in the rare earth element-containing polyester fiber is 0.5%-3.0%.

[0024] A production process of a polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flake, comprising the following steps:

[0025] 1. Preparation of upper and lower fiber webs

[0026] (1) Prepare 1 to 3 parts of low melting point polyester fiber, 2 to 6 parts of polyamide ester fiber, and 2 to 7 parts of ultra-fine denier polyester fiber respectively for use;

[0027] (2) Open and mix evenly under a certain temperature and humidity environment, then comb and cross-lay to obtain a surface density of 15 to 40 g / m 2 a first fiber web;

[0028] 2. Preparation of middle fiber web

[0029] (3) Prepare 2 to 4 parts of polyamide ester fiber, 2 to 6 parts of rare earth element-containing polyester fiber, and 2 to 5 parts of three-dimensional hollow polyester fiber respectively, and set aside;

[0030] (4) The above fibers are loosened and evenly mixed, and then combed and cross-laid to obtain a surface density of 30 to 300 g / m 2 a second fiber web;

[0031] 3. Fiber mesh layer stacking and consolidation:

[0032] (5) laminating and compounding the first fiber web obtained in step (2) and the second fiber web obtained in step (4) to obtain a middle-layer fiber web;

[0033] (6) superimposing the first fiber web obtained in step (2) on the upper and lower surfaces of the middle fiber web, respectively, to form an upper fiber web and a lower fiber web on the upper and lower surfaces of the middle fiber web, respectively, and performing needle punching reinforcement after superposition;

[0034] (7) Sending the flakes to a hot air drying room for hot air bonding and reinforcement at 160°C, and then ironing the surface to obtain flakes;

[0035] (8) trimming, sterilizing, rolling and packaging the flakes obtained in step (7) to obtain a polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flake.

[0036] In the production process of the polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flakes, in the step (2), the ambient temperature is 20-30° C. and the relative humidity is 60%-70%.

[0037] In the production process of the above-mentioned polyester fiber / polyamide ester fiber multi-layer composite thermal insulation batting, in the step (5), the first fiber web is superimposed on the surface of the second fiber web, the first fiber web is located in the upper layer, and the second fiber web is located in the lower layer.

[0038] In the production process of the above-mentioned polyester fiber / polyamide ester fiber multilayer composite thermal insulation flakes, when the step (6) is superimposed, the mass proportion of the upper fiber web and the lower fiber web in the flakes is 10% to 25% respectively, and the mass proportion of the middle fiber web is 50% to 80%.

[0039] The advantages of the polyester fiber / polyamide ester fiber multilayer composite thermal insulation flakes and the production process thereof of the present invention are: the flakes are composed of three layers: upper, middle and lower. The upper layer is the same as the lower layer, and plays the role of fixing the fibers and constructing a moisture-conducting interface, and the middle layer plays a role of thermal insulation. By combining the polyester fiber containing rare earth elements with the polyamide ester fiber, on the one hand, the heat-generating and thermal insulation performance of the flakes is improved, so that the flakes have a certain health-care effect. On the other hand, the addition of the polyamide ester fiber makes the flakes have a certain moisture-conducting effect. Through the three-layer structure and the assistance and coordination of each fiber, the flakes have a certain fluffiness, elasticity, and resilience, effectively lock the air, reduce heat loss, and further improve its comfort and thermal insulation. The defects of the traditional flakes that have poor moisture absorption, moisture conduction and air permeability and affect the thermal insulation performance are solved, and the overall thermal insulation performance of the flakes is effectively enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the cross-sectional structure of the polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flake of the present invention;

[0041] Figure 2 This is a production process flow chart of polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flakes. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] In the present invention, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the attached drawings; while "inside" and "outside" refer to the outline of the device. In addition, in the description of this application, the term "including" means "including but not limited to". The terms first, second, third, etc. are used only as labels and do not impose numerical requirements or establish an order. The term "plurality" means "two or more".

[0044] like Figure 1 As shown, a polyester fiber / polyamide fiber multilayer composite thermal insulation flocculent sheet is composed of an upper fiber web 1, a middle fiber web 2 and a lower fiber web 3. The upper fiber web 1 and the lower fiber web 3 are both made of a first fiber web 4. The middle fiber web 2 is formed by stacking and consolidating the first fiber web 4 and the second fiber web 5, wherein:

[0045] The first fiber web 4 is formed by mixing the following fibers in parts by weight:

[0046] 1-3 parts of low melting point polyester fiber;

[0047] 2-6 parts of polyamide polyester fiber;

[0048] 2-7 parts of ultra-fine polyester fiber;

[0049] The second fiber web 5 is formed by mixing the following fibers in parts by weight:

[0050] 2-4 parts of polyamide polyester fiber;

[0051] 2-6 parts of polyester fiber containing rare earth elements;

[0052] 2 to 5 parts of three-dimensional hollow polyester fibers.

[0053] The mass proportion of the upper fiber web 1 and the lower fiber web 3 in the flakes is 10% to 25% respectively, and the mass proportion of the middle fiber web 2 is 50% to 80%. The surface density of the first fiber web 4 is 15 to 40 g / m 2 The surface density of the second fiber web 5 is 30 to 300 g / m 2 .

[0054] In the first fiber web 4, the melting point of the low-melting-point polyester fiber is 110-130°C, the fineness is 0.9-2.0 dtex, the fineness of the polyamide ester fiber is 1.0-3.0 dtex, the fiber cross section is cross-shaped or H-shaped, the fineness of the ultra-fine denier polyester fiber is 0.5-0.8 dtex, and the cross section is circular. In the second fiber web 5, the fineness of the polyamide ester fiber is 1.0-3.0 dtex, the fiber cross section is cross-shaped or H-shaped, the fineness of the rare earth element-containing polyester fiber is 1.0-3.0 dtex, the fineness of the three-dimensional hollow polyester fiber is 3.0-12 dtex, and the structure is porous and hollow. The mass fraction of cerium, neodymium oxide or compound nanoparticles in the rare earth element-containing polyester fiber is 0.5%-3.0%.

[0055] like Figure 2 As shown, the production process of the polyester fiber / polyamide ester fiber multilayer composite thermal insulation flakes of the present invention comprises the following steps:

[0056] 1. Preparation of upper and lower fiber webs

[0057] (1) Prepare 1 to 3 parts of low melting point polyester fiber, 2 to 6 parts of polyamide ester fiber, and 2 to 7 parts of ultra-fine denier polyester fiber respectively for use;

[0058] (2) Open and mix evenly under a certain temperature and humidity environment, then comb and cross-lay to obtain a surface density of 15 to 40 g / m 2 a first fiber web;

[0059] 2. Preparation of middle fiber web

[0060] (3) Prepare 2 to 4 parts of polyamide ester fiber, 2 to 6 parts of rare earth element-containing polyester fiber, and 2 to 5 parts of three-dimensional hollow polyester fiber respectively, and set aside;

[0061] (4) The above fibers are loosened and evenly mixed, and then combed and cross-laid to obtain a surface density of 30 to 300 g / m 2 a second fiber web;

[0062] (5) laminating and compounding the first fiber web obtained in step (2) and the second fiber web obtained in step (4) to obtain a middle-layer fiber web;

[0063] 3. Fiber mesh layer stacking and consolidation:

[0064] (6) superimposing the first fiber web obtained in step (2) on the upper and lower surfaces of the middle fiber web, respectively, to form an upper fiber web and a lower fiber web on the upper and lower surfaces of the middle fiber web, respectively, and performing needle punching reinforcement after superposition;

[0065] (7) Sending the flakes to a hot air drying room for hot air bonding and reinforcement at 160°C, and then ironing the surface to obtain flakes;

[0066] (8) trimming, sterilizing, rolling and packaging the flakes obtained in step (7) to obtain a polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flake.

[0067] The upper and lower fiber webs are prepared in an environment with a temperature of 20-30°C and a relative humidity of 60%-70%. In step (5), the first fiber web is superimposed on the surface of the second fiber web, with the first fiber web being located on the upper layer and the second fiber web being located on the lower layer.

[0068] Polyamide ester fiber is a fiber made by copolymerization of terephthalic acid, ethylene glycol, and caprolactam. It has the characteristics of soft hand feeling, moderate strength, good moisture absorption and quick drying, and is more comfortable to wear than conventional polyester fiber. Polyamide ester fiber has a soft hand feeling and good simulation effect, and has excellent hydrophilic moisture conduction performance and good air permeability and moisture permeability. The present invention mixes polyester fiber and polyamide ester fiber as fiber flakes for filling materials of clothing and quilts, and obtains the effect of complementary advantages. It can make the flakes have certain fluffiness, elasticity, and resilience, while further improving the moisture absorption, moisture conduction and air permeability of the flakes, and enhancing the overall warmth retention of the flakes.

[0069] Rare earth element-containing polyester fibers are made by adding heating materials to polyester fibers. Common heating materials include carbon fibers, rare earth elements, metal fibers, etc. These materials can form an electron collision effect inside the polyester fibers, causing the fiber surface temperature to rise, thereby generating a heating effect. Rare earth element-containing polyester fibers have the following advantages: fast heating, which can be heated to a specified temperature within a few seconds after self-heating; good flame retardant properties, not easy to melt or deform at high temperatures; good stability, long service life, and the heating effect is not easy to decrease after multiple washings and wear; harmless to the human body, and a green and environmentally friendly fiber material. Heating fibers can be used to make winter warm and heating clothing, such as thermal underwear, heating shirts, etc., which can effectively increase the wearer's body surface temperature and reduce the occurrence of diseases such as winter colds. In summary, by adding heating material containing rare earth element polyester fiber to the flocs, the flocs are endowed with the characteristics of rapid heating, good flame retardant performance, good stability, and harmlessness, which effectively compensates for the defect that the warmth retention of the flocs is affected by the heat carried away by the breathable and moisture-permeable air circulation. At the same time, its heating performance accelerates the drying of moisture inside the flocs, reduces the thermal conductivity of the flocs, greatly reduces the impact on the fluffiness of the flocs, and further improves the warmth retention performance.

[0070] The present application is described in detail below through specific embodiments. The following embodiments are only partial embodiments of the present application and are not limitations of the present application.

[0071] Example 1

[0072] A polyester fiber / polyamide ester fiber multilayer composite thermal insulation batting, which consists of an upper fiber web, a middle fiber web and a lower fiber web, the upper and lower fiber webs are both made of a first fiber web, the middle fiber web is formed by laminating and consolidating the first fiber web and the second fiber web, wherein the first fiber web is formed by mixing the following fibers in parts by weight: 1 part of low-melting point polyester fiber; 2 parts of polyamide ester fiber; 2 parts of ultrafine denier polyester fiber; the second fiber web is formed by mixing the following fibers in parts by weight: 2 parts of polyamide ester fiber; 2 parts of rare earth element-containing polyester fiber; 2 parts of three-dimensional hollow polyester fiber.

[0073] The mass proportion of the upper fiber web and the lower fiber web in the flakes is 15% respectively, and the mass proportion of the middle fiber web is 70%. The surface density of the first fiber web is 15g / m 2 , the surface density of the second fiber web is 30g / m 2 .

[0074] In the first fiber web, the low-melting-point polyester fiber has a melting point of 110° C. and a fineness of 0.9 dtex, the polyamide ester fiber has a fineness of 1.0 dtex and a cross or H-shaped fiber cross section, and the ultrafine polyester fiber has a fineness of 0.5 dtex and a circular cross section.

[0075] In the second fiber web, the fineness of the polyamide ester fiber is 1.0 dtex, and the fiber cross section is cross-shaped or H-shaped. The fineness of the rare earth element-containing polyester fiber is 1.0 dtex. The fineness of the three-dimensional hollow polyester fiber is 3.0 dtex, and the structure is 5-hole hollow.

[0076] The mass fraction of cerium, neodymium oxide or compound nanoparticles in the rare earth element-containing polyester fiber is 0.5%.

[0077] A production process of a polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flake, comprising the following steps:

[0078] 1. Preparation of upper and lower fiber webs

[0079] (1) Prepare 1 part of low melting point polyester fiber, 2 parts of polyamide ester fiber, and 2 parts of ultra-fine denier polyester fiber respectively, and set them aside;

[0080] (2) Open and mix evenly at an ambient temperature of 20°C and a relative humidity of 60%, then card and cross-lay to obtain a surface density of 15 g / m 2 a first fiber web;

[0081] 2. Preparation of middle fiber web

[0082] (3) Prepare 2 parts of polyamide ester fiber, 2 parts of rare earth element-containing polyester fiber, and 2 parts of three-dimensional hollow polyester fiber respectively for use;

[0083] (4) The above fibers are loosened and evenly mixed, and then combed and cross-laid to obtain a surface density of 30 g / m 2 a second fiber web;

[0084] (5) laminating and compounding the first fiber web obtained in step (2) and the second fiber web obtained in step (4) to obtain a middle-layer fiber web;

[0085] 3. Fiber mesh layer stacking and consolidation:

[0086] (6) superimposing the first fiber web obtained in step (2) on the upper and lower surfaces of the middle fiber web, respectively, to form an upper fiber web and a lower fiber web on the upper and lower surfaces of the middle fiber web, respectively, and performing needle punching reinforcement after superimposing; when superimposing, the mass proportion of the upper fiber web and the lower fiber web in the flakes is 15% respectively, and the mass proportion of the middle fiber web is 70%;

[0087] (7) Sending the flakes to a hot air drying room for hot air bonding and reinforcement at 160°C, and then ironing the surface to obtain flakes;

[0088] (8) trimming, sterilizing, rolling and packaging the flakes obtained in step (7) to obtain a polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flake.

[0089] Example 2

[0090] A polyester fiber / polyamide ester fiber multilayer composite thermal insulation batting, which consists of an upper fiber web, a middle fiber web and a lower fiber web, the upper and lower fiber webs are both made of a first fiber web, the middle fiber web is formed by laminating and consolidating the first fiber web and the second fiber web, wherein the first fiber web is formed by mixing the following fibers in parts by weight: 2 parts of low-melting point polyester fiber; 5 parts of polyamide ester fiber; 3 parts of ultrafine denier polyester fiber; the second fiber web is formed by mixing the following fibers in parts by weight: 3 parts of polyamide ester fiber; 4 parts of rare earth element-containing polyester fiber; 4 parts of three-dimensional hollow polyester fiber.

[0091] The mass proportion of the upper fiber web and the lower fiber web in the flakes is 10% respectively, and the mass proportion of the middle fiber web is 80%. The surface density of the first fiber web is 20g / m 2 , the surface density of the second fiber web is 160g / m 2 .

[0092] In the first fiber web, the low-melting-point polyester fiber has a melting point of 120° C. and a fineness of 1.3 dtex, the polyamide ester fiber has a fineness of 2.0 dtex and a cross or H-shaped fiber cross section, and the ultrafine polyester fiber has a fineness of 0.6 dtex and a circular cross section.

[0093] In the second fiber web, the fineness of the polyamide ester fiber is 2.0 dtex, and the fiber cross section is cross-shaped or H-shaped. The fineness of the rare earth element-containing polyester fiber is 2.0 dtex. The fineness of the three-dimensional hollow polyester fiber is 8.0 dtex, and the structure is 7-hole hollow.

[0094] The mass fraction of cerium, neodymium oxide or compound nanoparticles in the rare earth element-containing polyester fiber is 2%.

[0095] A production process of a polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flake, comprising the following steps:

[0096] 1. Preparation of upper and lower fiber webs

[0097] (1) Prepare 2 parts of low melting point polyester fiber, 5 parts of polyamide fiber, and 3 parts of ultra-fine denier polyester fiber respectively for use;

[0098] (2) Open and mix evenly at an ambient temperature of 25°C and a relative humidity of 65%, then comb and cross-lay to obtain a surface density of 20 g / m 2 a first fiber web;

[0099] 2. Preparation of middle fiber web

[0100] (3) Prepare 3 parts of polyamide ester fiber, 4 parts of rare earth element-containing polyester fiber, and 4 parts of three-dimensional hollow polyester fiber respectively, and set aside;

[0101] (4) The above fibers are loosened and evenly mixed, and then combed and cross-laid to obtain a surface density of 160 g / m 2 a second fiber web;

[0102] (5) laminating and compounding the first fiber web obtained in step (2) and the second fiber web obtained in step (4) to obtain a middle-layer fiber web;

[0103] 3. Fiber mesh layer stacking and consolidation:

[0104] (6) superimposing the first fiber web obtained in step (2) on the upper and lower surfaces of the middle fiber web, respectively, to form an upper fiber web and a lower fiber web on the upper and lower surfaces of the middle fiber web, respectively, and performing needle punching reinforcement after superimposing; when superimposing, the mass proportion of the upper fiber web and the lower fiber web in the flakes is 10% respectively, and the mass proportion of the middle fiber web is 80%;

[0105] (7) Sending the flakes to a hot air drying room for hot air bonding and reinforcement at 160°C, and then ironing the surface to obtain flakes;

[0106] (8) trimming, sterilizing, rolling and packaging the flakes obtained in step (7) to obtain a polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flake.

[0107] Example 3

[0108] A polyester fiber / polyamide ester fiber multilayer composite thermal insulation batting, which consists of an upper fiber web, a middle fiber web and a lower fiber web, the upper and lower fiber webs are both made of a first fiber web, the middle fiber web is formed by laminating and consolidating the first fiber web and the second fiber web, wherein the first fiber web is formed by mixing the following fibers in parts by weight: 3 parts of low-melting point polyester fiber; 6 parts of polyamide ester fiber; 7 parts of ultrafine denier polyester fiber; the second fiber web is formed by mixing the following fibers in parts by weight: 4 parts of polyamide ester fiber; 6 parts of rare earth element-containing polyester fiber; 5 parts of three-dimensional hollow polyester fiber.

[0109] The mass proportion of the upper fiber web and the lower fiber web in the flakes is 25% respectively, and the mass proportion of the middle fiber web is 50%. The surface density of the first fiber web is 40g / m 2 , the surface density of the second fiber web is 300g / m 2 .

[0110] In the first fiber web, the low-melting-point polyester fiber has a melting point of 130° C. and a fineness of 2.0 dtex, the polyamide ester fiber has a fineness of 13.0 dtex and a cross or H-shaped fiber cross section, and the ultrafine polyester fiber has a fineness of 0.8 dtex and a circular cross section.

[0111] In the second fiber web, the fineness of the polyamide ester fiber is 3.0 dtex, and the fiber cross section is cross-shaped or H-shaped. The fineness of the rare earth element-containing polyester fiber is 3.0 dtex. The fineness of the three-dimensional hollow polyester fiber is 12 dtex, and the structure is 6-hole hollow.

[0112] The mass fraction of cerium, neodymium oxide or compound nanoparticles in the rare earth element-containing polyester fiber is 3.0%.

[0113] A production process of a polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flake, comprising the following steps:

[0114] 1. Preparation of upper and lower fiber webs

[0115] (1) Prepare 3 parts of low melting point polyester fiber, 6 parts of polyamide ester fiber, and 7 parts of ultra-fine denier polyester fiber respectively for use;

[0116] (2) Open and mix evenly at an ambient temperature of 30°C and a relative humidity of 70%, then card and cross-lay to obtain a surface density of 40 g / m 2 a first fiber web;

[0117] 2. Preparation of middle fiber web

[0118] (3) Prepare 4 parts of polyamide ester fiber, 6 parts of rare earth element-containing polyester fiber, and 5 parts of three-dimensional hollow polyester fiber respectively for use;

[0119] (4) The above fibers are loosened and evenly mixed, and then combed and cross-laid to obtain a surface density of 300 g / m 2 a second fiber web;

[0120] (5) laminating and compounding the first fiber web obtained in step (2) and the second fiber web obtained in step (4) to obtain a middle-layer fiber web;

[0121] 3. Fiber mesh layer stacking and consolidation:

[0122] (6) superimposing the first fiber web obtained in step (2) on the upper and lower surfaces of the middle fiber web, respectively, to form an upper fiber web and a lower fiber web on the upper and lower surfaces of the middle fiber web, respectively, and performing needle punching reinforcement after superimposing; when superimposing, the mass proportion of the upper fiber web and the lower fiber web in the flakes is 25% respectively, and the mass proportion of the middle fiber web is 50%;

[0123] (7) Sending the flakes to a hot air drying room for hot air bonding and reinforcement at 160°C, and then ironing the surface to obtain flakes;

[0124] (8) trimming, sterilizing, rolling and packaging the flakes obtained in step (7) to obtain a polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flake.

[0125] The test results of the polyester fiber / polyamide ester fiber multilayer composite thermal insulation flakes prepared in Examples 1-3 of the present invention are as follows:

[0126]

[0127] As can be seen from the above table, the rare earth element-containing polyester fiber and polyamide ester fiber composite thermal insulation flakes of the present invention have good thermal insulation, far-infrared heating and excellent moisture conduction effects. It can be seen that by constructing a moisture conduction interface through the upper and lower layers, and the middle layer plays a role in thermal insulation, combined with adding rare earth element-containing polyester fiber and polyamide ester fiber to the polyester fiber flakes, the polyester fiber flakes have far-infrared heating and moisture conduction functions, and it is feasible to greatly improve the comfort of use of the polyester fiber flakes.

[0128] The technical problem to be solved by the present invention is to improve the warmth retention and moisture conductivity of synthetic fiber flakes. The flakes are composed of three layers: upper, middle and lower. The upper fiber web 1 is the same as the lower fiber web 3, which plays the role of fiber fixation and building a moisture-conducting interface. The middle fiber web 2 plays the role of heating and warmth retention. The three-layer composite structure not only has a warming effect, but also achieves the purpose of rapid air permeability and moisture permeability.

[0129] The upper fiber web 1 and the lower fiber web 3 are the surface layers, which are mainly composed of low-melting point polyester fibers, polyamide ester fibers, and ultra-fine denier polyester fibers. The low-melting point fibers mainly play a bonding and fixing role, so that the surface layer of the flakes has a certain shape-retaining function and can prevent the fibers from flying. The polyamide ester fibers mainly play a moisture-conducting role, especially their cross or H-shaped cross-sections, which form a large number of external grooves on the fiber surface. These external grooves can enhance the wicking effect on the surface of the flakes, giving the flakes better moisture permeability. The ultra-fine denier polyester fibers mainly adjust the feel of the flakes, making them softer and more comfortable to the touch. At the same time, the combined effect of ultra-fine denier polyester fibers and polyamide ester fibers with different cross-sections can further enhance the capillary effect between fibers. Figure 1 It can be seen that by utilizing the rapid moisture conduction function of the upper fiber mesh 1 and the lower fiber mesh 3, the moisture generated by sweat can be quickly discharged from the flakes, avoiding the problem that when the flakes absorb moisture, the thermal conductivity increases, causing heat to be lost through the fiber material, resulting in reduced warmth retention effect.

[0130] The middle fiber net 2 (middle layer) is composed of polyamide ester fiber, rare earth element polyester fiber, and three-dimensional hollow polyester fiber. The polyamide ester fiber mainly conducts moisture and improves the feel of the flakes. The rare earth element polyester fiber mainly generates far infrared heat and enhances the warmth retention. It also has a certain antibacterial function. The three-dimensional hollow polyester fiber mainly maintains warmth and overall elasticity. The middle layer effectively makes up for the defect that the warmth retention of the flakes is affected by the air permeable and moisture permeable air circulation taking away heat. At the same time, when moisture enters the middle fiber net 2 through the lower fiber net 3, its heat generation performance accelerates the drying of moisture inside the flakes, which not only reduces the thermal conductivity of the flakes, but also assists in the rapid discharge of moisture to the upper fiber net 1, greatly reducing the influence of moisture retention on the flakes' fluffiness and further improving the warmth retention performance.

[0131] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A polyester fiber / polyamide fiber multilayer composite thermal insulation flake, which is composed of an upper fiber web, a middle fiber web and a lower fiber web, characterized in that: The upper and lower fiber webs are both made of the first fiber web, and the middle fiber web is made by laminating and consolidating the first fiber web and the second fiber web, wherein: The first fiber web is formed by mixing the following fibers in parts by weight: 1-3 parts of low melting point polyester fiber; 2-6 parts of polyamide polyester fiber; 2-7 parts of ultra-fine polyester fiber; The second fiber web is formed by mixing the following fibers in parts by weight: 2-4 parts of polyamide polyester fiber; 2-6 parts of polyester fiber containing rare earth elements; 2 to 5 parts of three-dimensional hollow polyester fibers.

2. The polyester fiber / polyamide ester fiber multilayer composite thermal insulation flake according to claim 1, characterized in that: The mass proportion of the upper fiber web and the lower fiber web in the flakes is 10% to 25% respectively, and the mass proportion of the middle fiber web is 50% to 80%.

3. The polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flakes according to claim 1 are characterized in that: The surface density of the first fiber web is 15 to 40 g / m 2 The surface density of the second fiber web is 30 to 300 g / m 2 .

4. The polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flakes according to claim 1, characterized in that: In the first fiber web, the low-melting-point polyester fiber has a melting point of 110-130°C and a fineness of 0.9-2.0 dtex, the polyamide ester fiber has a fineness of 1.0-3.0 dtex, and a cross-shaped or H-shaped fiber cross section, and the ultrafine denier polyester fiber has a fineness of 0.5-0.8 dtex and a circular cross section.

5. The polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flakes according to claim 1, characterized in that: In the second fiber web, the fineness of the polyamide ester fiber is 1.0-3.0 dtex, and the fiber cross-section is cross-shaped or H-shaped. The fineness of the rare earth element-containing polyester fiber is 1.0-3.0 dtex. The fineness of the three-dimensional hollow polyester fiber is 3.0-12 dtex, and the structure is porous hollow.

6. The polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flakes according to claim 5, characterized in that: The mass fraction of cerium, neodymium oxide or compound nanoparticles in the rare earth element-containing polyester fiber is 0.5%-3.0%.

7. A process for producing the polyester fiber / polyamide ester fiber multilayer composite thermal insulation flakes as claimed in claims 1 to 6, characterized in that: The steps include:

1. Preparation of upper and lower fiber webs (1) Prepare 1 to 3 parts of low melting point polyester fiber, 2 to 6 parts of polyamide ester fiber, and 2 to 7 parts of ultra-fine denier polyester fiber respectively for use; (2) Open and mix evenly under a certain temperature and humidity environment, then comb and cross-lay to obtain a surface density of 15 to 40 g / m 2 a first fiber web; 2. Preparation of middle fiber web (3) Prepare 2 to 4 parts of polyamide ester fiber, 2 to 6 parts of rare earth element-containing polyester fiber, and 2 to 5 parts of three-dimensional hollow polyester fiber respectively, and set aside; (4) The above fibers are loosened and evenly mixed, and then combed and cross-laid to obtain a surface density of 30 to 300 g / m 2 a second fiber web; (5) laminating and compounding the first fiber web obtained in step (2) and the second fiber web obtained in step (4) to obtain a middle-layer fiber web; 3. Fiber mesh layer stacking and consolidation: (6) superimposing the first fiber web obtained in step (2) on the upper and lower surfaces of the middle fiber web, respectively, to form an upper fiber web and a lower fiber web on the upper and lower surfaces of the middle fiber web, respectively, and performing needle punching reinforcement after superposition; (7) Sending the flakes to a hot air drying room for hot air bonding and reinforcement at 160°C, and then ironing the surface to obtain flakes; (8) trimming, sterilizing, rolling and packaging the flakes obtained in step (7) to obtain a polyester fiber / polyamide ester fiber multi-layer composite thermal insulation flake.

8. The production process of the polyester fiber / polyamide ester fiber multilayer composite thermal insulation flakes according to claim 7, characterized in that: In the step (2), the ambient temperature is 20-30° C. and the relative humidity is 60%-70%.

9. The production process of the polyester fiber / polyamide ester fiber multilayer composite thermal insulation flakes according to claim 7, characterized in that: In the step (5), the first fiber web is superimposed on the surface of the second fiber web, with the first fiber web being located on the upper layer and the second fiber web being located on the lower layer.

10. The production process of the polyester fiber / polyamide ester fiber multilayer composite thermal insulation flakes according to claim 7, characterized in that: When the fibers are stacked in step (6), the mass proportions of the upper fiber web and the lower fiber web in the flakes are 10% to 25% respectively, and the mass proportion of the middle fiber web is 50% to 80%.

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