Porous light warm-keeping polyester fiber and preparation method thereof

Abstract

The invention provides a porous light warm-keeping polyester fiber, which is prepared from the following raw materials: mixed binary acid, dihydric alcohol, an esterification catalyst, a nano porous carbon material, long carbon chain dihydric alcohol, carbon material in-situ modified polyester master batch, polyester and an aqueous solution. A carbon material is introduced into fiber-grade polyester for in-situ modification of polyester master batches, blending spinning is carried out, a master batch matrix is water-soluble polyester and is polyester polymers, uniform distribution and dispersion in the fiber-grade polyester can be achieved, and it is guaranteed that fibers have good spinnability and mechanical properties; micropores in the prepared porous light polyester fiber have mutual independence and do not form an interpenetrating structure, the micropores of independent cavities firmly lock circulating air by virtue of the high specific surface area of the micropores, and the air is statically locked in the micropores to play a role in blocking heat dissipation.

Description

Technical Field

[0001] The invention relates to the field of polyester, and in particular to a porous, lightweight, warm-keeping polyester fiber and a preparation method thereof. Background Art

[0002] Polyester fiber is the basic raw material for textiles. With the continuous upgrading of terminal consumer demand, the performance requirements of polyester fiber products are getting higher and higher, and the functional improvement of polyester fiber has become more and more urgent. Conventional polyester fiber has good mechanical properties, wear resistance and other characteristics. Thermal insulation performance is the basic function of fiber materials as clothing textiles, but when it is used as a clothing fiber material, especially as a clothing thermal insulation material, there is a problem of poor thermal insulation. Natural fiber materials such as cotton or animal feathers have good thermal insulation properties. From the microstructural analysis, it can be found that these high-efficiency thermal insulation fiber materials have a large number of microporous structures that can enrich air, and these micropores are independent of each other, which reduces the heat exchange and circulation between air and achieves the thermal insulation effect to the greatest extent.

[0003] Chinese invention patent CN114103365A discloses a lightweight thermal insulation functional flocculent sheet and its preparation method, which introduces a certain proportion of zirconium carbide and titanium dioxide functional powder into polyester fiber, and achieves warmth and lightweight through a specific structure composite with a polyimide nanofiber layer.

[0004] Chinese invention patent CN110735198A discloses a modified PET polyester fiber and a preparation method and polyester fabric, which is a silica aerogel loaded with nano far-infrared powder in the polyester fiber. The modified PET polyester fiber has the characteristics of low density and poor thermal conductivity, and can emit far-infrared. The woven fabric has the advantages of lightness and good warmth retention.

[0005] Chinese invention patent CN110552081A discloses a modified polyester fiber and a preparation method thereof. The modified polyester fiber contains a certain proportion of functional particles of a core-shell structure. The core of the functional particles is a light-absorbing and heat-generating particle, and the shell is a light-transmitting layer. When the fabric made of the modified polyester fiber is irradiated with light, the light can pass through the light-transmitting layer, and the light-absorbing and heat-generating particles absorb the light and convert it into heat, thereby providing a warming effect.

[0006] Chinese invention patent CN103603070A discloses a method for preparing highly comfortable triangular hollow microporous fibers. The method adopts online metering addition technology and then a melt spinning process, and uses three symmetrical "V"-shaped spinnerets as spinneret assemblies to obtain fibers, which are then subjected to alkali reduction treatment to obtain highly comfortable triangular cross-section hollow microporous polyester fibers. The fiber fabric has the advantages of being dry and cool, absorbing sweat and moisture, being easy to wash, drying quickly, being lightweight, and keeping warm.

[0007] From the above disclosed technologies, the current technologies for improving the thermal insulation of polyester fibers are mainly divided into two categories: First, a certain proportion of functional materials are introduced into polyester fibers, including light-absorbing and heat-generating functional materials and far-infrared reflecting functional materials. The light-absorbing and heat-generating functional materials are introduced into the fibers to absorb sunlight and convert it into thermal energy, and the far-infrared reflecting functional materials are introduced into the fibers to reflect the heat of the human body to obtain a warming effect. However, the light-absorbing and heat-generating functional materials require strong external lighting conditions to achieve photothermal conversion. It is difficult to achieve improved warmth retention under weak light or no light conditions. The far-infrared reflecting functional materials reflect the heat wavelengths emitted by the human body itself to reduce dissipation, and the effect is limited; Second, the fiber is highly shaped or porous in a certain shaped spinning or post-processing process to increase the specific surface area, thereby enriching a lot of air to improve the thermal insulation performance. However, the air enriched in this highly shaped structure is usually connected, and there is heat exchange, or there is heat dissipation.

[0008] Therefore, it is necessary to provide a porous, lightweight, warm-keeping polyester fiber to solve the above-mentioned technical problems. Summary of the invention

[0009] The present invention provides a porous, lightweight, thermal insulation polyester fiber, which solves the problem that the highly profiled structure of the polyester fiber usually has the air enriched being interconnected, heat exchange existing, or heat dissipation existing.

[0010] In order to solve the above technical problems, the present invention provides a porous lightweight thermal insulation polyester fiber, comprising the following raw materials:

[0011] The dibasic acid, diol, esterification catalyst, nanoporous carbon material, long carbon chain diol, carbon material in-situ modified polyester masterbatch, polyester and aqueous solution are mixed.

[0012] Preferably, the diol may be ethylene glycol, propylene glycol, butylene glycol or pentanediol.

[0013] A method for preparing porous lightweight thermal insulation polyester fiber comprises the following steps:

[0014] S1, the mixed dibasic acid is composed of sodium 5-sulfoisophthalic acid and one of terephthalic acid, isophthalic acid, adipic acid, succinic acid, and furandicarboxylic acid, and the molar fraction of sodium 5-sulfoisophthalic acid is 20-60% of the mixed dibasic acid;

[0015] S2, the molar ratio of the mixed dibasic acid to the diol is 1:1.2-2.0 for esterification reaction, the esterification reaction temperature is 200-250°C, the esterification pressure is 0.01-0.1MPa, the esterification time is 2.5-5.0h, and 10-1000ppm of catalyst relative to the mixed dibasic acid is introduced into the esterification reaction;

[0016] S3, when the esterification reaction of the dibasic acid and diol mixed in S2 is 80-90% completed, a certain mass fraction of nanoporous carbon material is introduced for further esterification, the amount of the nanoporous carbon material added is 5-50% of the mass of the mixed dibasic acid, and the intrinsic viscosity of the esterification product after the esterification reaction is completed is 0.15-0.20 dL / g;

[0017] S4, after the esterification reaction in S3 is completed, a long carbon chain diol is introduced for pre-condensation, the pre-condensation reaction temperature is 220-265°C, the pre-condensation reaction pressure is 500-2000kPa, the pre-condensation reaction time is 0.5-2.0h, the relative molecular weight is 400-2000g / mol, the addition amount is 40-80% of the molar fraction of the esterification product, and the intrinsic viscosity of the pre-condensation reaction product after the pre-condensation reaction is completed is 0.20-0.35dL / g;

[0018] S5, after the pre-polycondensation reaction in S4 is completed, the final polycondensation reaction is started, the final polycondensation reaction temperature is 240-285°C, the final polycondensation reaction pressure is 0-100kPa, the final polycondensation reaction time is 1.0-3.0h, wherein after the final polycondensation is completed, the intrinsic viscosity of the final polycondensation product is 0.50-0.60dL / g;

[0019] S6, blending the carbon material in-situ modified polyester masterbatch and polyester in a certain ratio to form melt spinning, the intrinsic viscosity is 0.65-1.25 dL / g, and the mixing mass ratio of the carbon material in-situ modified polyester masterbatch and the polyester is 2:98-20:80;

[0020] The carbon material in-situ modified polyester masterbatch in S7 and S6 is blended with polyester in a certain ratio and melt-spun to obtain a fiber, which is treated with an aqueous solution at a temperature of 50-100° C. for 3-30 min, and a mass ratio of fiber to solution of 1:10-1:50;

[0021] S8, in S7, the fiber fineness is 1.0-5.0dtex, the mechanical breaking strength is 2.5-5.0cN / dtex, the breaking elongation is 10-40%, the fiber has a porous structure, the pore size is 50-500nm, the fiber specific surface area is increased by 1.5-5.0 times, the micropores have independent chambers, the far-infrared reflectivity is ≥95%, and the lightweight warmth retention is 5-20wt% lighter than the same specification polyester fiber.

[0022] Preferably, the particle size of the nanoporous carbon material in S3 is 0.5-5 μm, and the micropore size is 50-200 nm.

[0023] Preferably, the long carbon chain diol in S4 may be polyethylene glycol, polypropylene glycol or polybutylene glycol.

[0024] Preferably, the polyester in S6 may be polyethylene terephthalate, polypropylene terephthalate or polybutylene terephthalate.

[0025] Preferably, an extrusion device is required for the melt spinning forming process in S6, and the extrusion device includes a workbench, an extruder body is installed on the surface of the workbench, a cooling cylinder is arranged at one end of the extruder body, a bottom plate is connected to one side of the workbench, a conveying device is arranged on the surface of the bottom plate, the conveying device includes a water tank, a water pump is installed on one side of the water tank, the input and output ends of the water pump are both connected to conveying pipes, one end of one of the conveying pipes is connected to a connector, one end of the connector is connected to the cooling cylinder, a filling pipe is installed on one side of the top of the water tank, and a feeding hopper is connected to one side of the extruder body.

[0026] Preferably, a circulation component is provided between the cooling cylinder and the water tank, the circulation component comprises a mounting head, one end of the mounting head is connected to a circulation pipe, and one end of the circulation pipe is connected to the water tank.

[0027] Preferably, a fixing assembly is provided between the cooling cylinder and the extruder body, the fixing assembly includes a fixing hoop, a fixing seat is symmetrically connected to the surface of the fixing hoop, a fixing rod is connected to one side of two fixing seats, a fixing ring is connected between the two fixing rods, the fixing ring is connected to the surface of the cooling cylinder, and a bolt is provided on one side of the fixing ring.

[0028] Preferably, a guide assembly is provided inside the feeding hopper, and the guide assembly includes a guide bucket, a clamping joint is connected to the bottom of the guide bucket, and a spiral guide plate is connected to the inside of the guide bucket.

[0029] Compared with the related art, the porous lightweight thermal insulation polyester fiber provided by the present invention has the following beneficial effects:

[0030] The present invention provides a porous, lightweight, warm-keeping polyester fiber. A carbon material is introduced into a fiber-grade polyester to modify a polyester masterbatch in situ, and the masterbatch matrix is ​​a water-soluble polyester, which is a polyester polymer. The masterbatch can be evenly dispersed in the fiber-grade polyester, thereby ensuring that the fiber has good spinnability and mechanical properties.

[0031] The micropores in the prepared porous lightweight polyester fiber are independent of each other and do not form a mutually penetrating structure. The micropores in the independent chamber firmly lock the circulating air with their high specific surface area. The air is statically locked in the micropores to prevent heat from escaping.

[0032] The carbon material in the prepared fiber material can reflect the heat of the human body efficiently, and can reflect the far-infrared wavelengths emitted by the human body efficiently, greatly reducing the dissipation of heat from the human body;

[0033] The performance of the prepared porous lightweight polyester fiber can be flexibly adjusted, and the amount of fiber microporous structure can be changed by regulating the amount of porous carbon material introduced to meet different lightweight and warmth retention application requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic structural diagram of a second embodiment of a porous, lightweight, thermal-retaining polyester fiber provided by the present invention;

[0035] Figure 2 for Figure 1 An enlarged schematic diagram of part A is shown;

[0036] Figure 3 for Figure 1 An enlarged schematic diagram of part B is shown;

[0037] Figure 4 A schematic structural diagram of a third embodiment of a porous, lightweight, thermal-retaining polyester fiber provided by the present invention;

[0038] Figure 5 for Figure 4 An enlarged schematic diagram of part C is shown.

[0039] Numbers in the figure: 1, workbench; 2, extruder body; 3, cooling cylinder;

[0040] 4. Delivery device; 41. Water tank; 42. Water pump; 43. Delivery pipe; 44. Connector;

[0041] 5. circulation assembly; 51. mounting head; 52. circulation pipe;

[0042] 6. Fixing assembly; 61. Fixing hoop; 62. Fixing seat; 63. Fixing rod; 64. Fixing ring; 65. Bolt;

[0043] 7. Feeding hopper; 8. Filling pipe; 9. Bottom plate;

[0044] 10. Guide assembly; 101. Guide bucket; 102. Card joint; 103. Spiral guide plate. DETAILED DESCRIPTION

[0045] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0046] First embodiment

[0047] A porous, lightweight, thermal insulation polyester fiber comprising the following raw materials:

[0048] The dibasic acid, diol, esterification catalyst, nanoporous carbon material, long carbon chain diol, carbon material in-situ modified polyester masterbatch, polyester and aqueous solution are mixed.

[0049] The diol may be ethylene glycol, propylene glycol, butylene glycol or pentylene glycol.

[0050] The mixed dibasic acid is composed of 5-sodium sulfoisophthalic acid and one of terephthalic acid, isophthalic acid, adipic acid, succinic acid and furandicarboxylic acid.

[0051] The esterification catalyst is one of ethylene glycol titanium, tetrabutyl titanate, ethylene glycol antimony, antimony acetate and antimony oxide.

[0052] A method for preparing porous lightweight thermal insulation polyester fiber comprises the following steps:

[0053] S1, the mixed dibasic acid is composed of sodium 5-sulfoisophthalic acid and one of terephthalic acid, isophthalic acid, adipic acid, succinic acid, and furandicarboxylic acid, and the molar fraction of sodium 5-sulfoisophthalic acid is 20-60% of the mixed dibasic acid;

[0054] S2, the molar ratio of the mixed dibasic acid to the diol is 1:1.2-2.0 for esterification reaction, the esterification reaction temperature is 200-250°C, the esterification pressure is 0.01-0.1MPa, the esterification time is 2.5-5.0h, and 10-1000ppm of catalyst relative to the mixed dibasic acid is introduced into the esterification reaction;

[0055] S3, when the esterification reaction of the dibasic acid and diol mixed in S2 is 80-90% completed, a certain mass fraction of nanoporous carbon material is introduced for further esterification, the amount of the nanoporous carbon material added is 5-50% of the mass of the mixed dibasic acid, and the intrinsic viscosity of the esterification product after the esterification reaction is completed is 0.15-0.20 dL / g;

[0056] S4, after the esterification reaction in S3 is completed, a long carbon chain diol is introduced for pre-condensation, the pre-condensation reaction temperature is 220-265°C, the pre-condensation reaction pressure is 500-2000kPa, the pre-condensation reaction time is 0.5-2.0h, the relative molecular weight is 400-2000g / mol, the addition amount is 40-80% of the molar fraction of the esterification product, and the intrinsic viscosity of the pre-condensation reaction product after the pre-condensation reaction is completed is 0.20-0.35dL / g;

[0057] S5, after the pre-polycondensation reaction in S4 is completed, the final polycondensation reaction is started, the final polycondensation reaction temperature is 240-285°C, the final polycondensation reaction pressure is 0-100kPa, the final polycondensation reaction time is 1.0-3.0h, wherein after the final polycondensation is completed, the intrinsic viscosity of the final polycondensation product is 0.50-0.60dL / g;

[0058] S6, blending the carbon material in-situ modified polyester masterbatch and polyester in a certain ratio to form melt spinning, the intrinsic viscosity is 0.65-1.25 dL / g, and the mixing mass ratio of the carbon material in-situ modified polyester masterbatch and the polyester is 2:98-20:80;

[0059] The carbon material in-situ modified polyester masterbatch in S7 and S6 is blended with polyester in a certain ratio and melt-spun to obtain a fiber, which is treated with an aqueous solution at a temperature of 50-100° C. for 3-30 min, and a mass ratio of fiber to solution of 1:10-1:50;

[0060] S8, in S7, the fiber fineness is 1.0-5.0dtex, the mechanical breaking strength is 2.5-5.0cN / dtex, the breaking elongation is 10-40%, the fiber has a porous structure, the pore size is 50-500nm, the fiber specific surface area is increased by 1.5-5.0 times, the micropores have independent chambers, the far-infrared reflectivity is ≥95%, and the lightweight warmth retention is 5-20wt% lighter than the same specification polyester fiber.

[0061] The nanoporous carbon material in S3 has a particle size of 0.5-5 μm and a micropore size of 50-200 nm.

[0062] The long carbon chain diol in S4 may be polyethylene glycol, polypropylene glycol or polybutylene glycol.

[0063] The polyester in S6 may be polyethylene terephthalate, polypropylene terephthalate or polybutylene terephthalate.

[0064] Lightweight thermal insulation fiber materials have been pursued and researched in the field of clothing textiles. At present, the research on improving the thermal insulation of fiber materials includes two major technologies: by introducing functional materials of micro-nano size, absorbing external light energy and converting it into heat through radiation or conduction to the human body. Or by introducing functional materials with far-infrared reflection, the heat generated by the heat source of the human body itself is efficiently reflected back to reduce heat dissipation, which is also the main method currently used. Another method is to give the fiber a high profile or porous structure through certain technologies, increase its surface area and thus improve its ability to enrich air, so as to achieve a warming effect.

[0065] The present invention introduces a certain carbon material into the fiber-grade polyester to modify the polyester masterbatch by in-situ polymerization and performs co-spinning to prepare the polyester fiber, wherein the polyester part in the polyester masterbatch modified by in-situ polymerization of the carbon material has a water-soluble characteristic and can be dissolved in a certain aqueous solution. The polyester fiber prepared by the co-spinning is treated with an aqueous solution, and the water-soluble components in the fiber will be dissolved, including the water-soluble polyester coated on the outside of the porous carbon material and the water-soluble polyester in the micropores of the carbon material, while the fiber-grade polyester and the porous carbon material will not be dissolved, and the fiber-grade polyester plays a skeleton role. In this way, the polyester fiber treated with the aqueous solution has a porous structure, and the carbon material particles are independent of each other and not connected. The polyester masterbatch modified by in-situ polymerization of the carbon material introduced by the present invention is treated with an aqueous solution to realize that the carbon material is densely filled with the water-soluble polyester and dissolved in the water-soluble polyester to form an adsorbable microporous structure. This method solves the problem that the porous structure of the existing porous material in the fiber introduced into the polymer for co-modified spinning is densely filled with the polymer and cannot play the original adsorption function. After the water-soluble polyester in the fiber is dissolved, the specific gravity of the fiber decreases, which has the advantage of being light in weight.

[0066] The porous carbon material is added when the esterification of the mixed dibasic acid and diol is completed to 80-90%. At this time, the esterification reaction changes from a heterogeneous system to a homogeneous system, and the system shows a clear point. At the beginning of the esterification, the dibasic acid can only be slightly dissolved in the diol, and the dissolved dibasic acid reacts with the diol for esterification. The reaction rate is low in the initial stage. The esterified product generated by the esterification reaction is a good solvent for the dibasic acid. The dibasic acid can be fully dissolved in the esterified product. Therefore, as the esterification product increases, more dibasic acid dissolves in the esterification, and the reaction rate gradually increases. When the dibasic acid is completely dissolved in the esterification product, the system shows a homogeneous characteristic. At this time, the porous carbon material is introduced into it, and the substances in the homogeneous system are carried out due to the high flow characteristics. The carbon fiber enters into the micropores, and the micropores become independent reaction chambers. After further esterification, pre-condensation and final condensation reactions, the final product is generated in the independent micropore chambers, and the product is coated to form a polyester modified by in-situ polymerization of carbon material with a certain fluidity. Since the porous carbon material has a high content in the polyester, a polyester masterbatch modified by in-situ polymerization of carbon material is formed. The matrix of the polyester masterbatch modified by in-situ polymerization of carbon material is a modified polyester with water-soluble characteristics, which has thermoplastic characteristics and can achieve good fluidity characteristics of the masterbatch during processing. At the same time, the polyester masterbatch and the fiber-grade polyester also have good thermodynamic compatibility, which can achieve the uniform dispersion of the polyester masterbatch modified by in-situ polymerization of carbon material in the fiber-grade polyester.

[0067] The porous lightweight polyester fiber prepared by the present invention can change the number of fiber micropore structures by adjusting the amount of porous carbon material introduced, so as to meet different light weight and warmth preservation application requirements. The micropores in the prepared porous lightweight polyester fiber are independent of each other and do not form a mutually penetrating structure, which is particularly important for warmth preservation. The micropores in the independent chambers firmly lock the circulating air by virtue of their high specific surface area. The air is statically locked in the micropores to block the heat dissipation. The micropores in the countless independent chamber structures realize efficient warmth preservation, which is different from the existing fibers with interconnected hollow structures. At the same time, the carbon material itself can efficiently reflect the heat of the human body. The porous carbon material in the fiber not only has efficient air enrichment ability, but also efficiently reflects the far-infrared wavelengths emitted by the human body, thereby greatly reducing the heat dissipation of the human body.

[0068] Compared with the related art, the porous lightweight thermal insulation polyester fiber provided by the present invention has the following beneficial effects:

[0069] The present invention provides a porous, lightweight, warm-keeping polyester fiber. A carbon material is introduced into a fiber-grade polyester to modify a polyester masterbatch in situ, and the masterbatch matrix is ​​a water-soluble polyester, which is a polyester polymer. The masterbatch can be evenly dispersed in the fiber-grade polyester, thereby ensuring that the fiber has good spinnability and mechanical properties.

[0070] The micropores in the prepared porous lightweight polyester fiber are independent of each other and do not form a mutually penetrating structure. The micropores in the independent chamber firmly lock the circulating air with their high specific surface area. The air is statically locked in the micropores to prevent heat from escaping.

[0071] The carbon material in the prepared fiber material can reflect the heat of the human body efficiently, and can reflect the far-infrared wavelengths emitted by the human body efficiently, greatly reducing the dissipation of heat from the human body;

[0072] The performance of the prepared porous lightweight polyester fiber can be flexibly adjusted, and the amount of fiber microporous structure can be changed by regulating the amount of porous carbon material introduced to meet different lightweight and warmth retention application requirements.

[0073] Second embodiment

[0074] Please refer to Figure 1 , Figure 2 and Figure 3 Based on the porous lightweight thermal insulation polyester fiber provided in the first embodiment of the present application, the second embodiment of the present application proposes another porous lightweight thermal insulation polyester fiber. The second embodiment is only a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0075] Specifically, the second embodiment of the present application provides a porous lightweight thermal insulation polyester fiber that is different in that, for a porous lightweight thermal insulation polyester fiber, an extrusion device is required during the melt spinning forming process in S6, and the extrusion device includes a workbench 1, an extruder body 2 is installed on the surface of the workbench 1, a cooling cylinder 3 is arranged at one end of the extruder body 2, a bottom plate 9 is connected to one side of the workbench 1, a conveying device 4 is arranged on the surface of the bottom plate 9, and the conveying device 4 includes a water tank 41, a water pump 42 is installed on one side of the water tank 41, and the input and output ends of the water pump 42 are both connected to a conveying pipe 43, one end of one of the conveying pipes 43 is connected to a connector 44, one end of the connector 44 is connected to the cooling cylinder 3, a filling pipe 8 is installed on one side of the top of the water tank 41, and a feeding hopper 7 is connected to one side of the extruder body 2.

[0076] A circulation assembly 5 is provided between the cooling cylinder 3 and the water tank 41 . The circulation assembly 5 includes a mounting head 51 . One end of the mounting head 51 is connected to a circulation pipe 52 . One end of the circulation pipe 52 is connected to the water tank 41 .

[0077] One end of the mounting head 51 is connected to the cooling cylinder 3 . The mounting head 51 and the circulation pipe 52 can be used to transport the liquid inside the cooling cylinder 3 to the water tank 41 for circulation.

[0078] A fixing assembly 6 is arranged between the cooling cylinder 3 and the extruder body 2, and the fixing assembly 6 includes a fixing hoop 61, and a fixing seat 62 is symmetrically connected to the surface of the fixing hoop 61, and a fixing rod 63 is connected to one side of the two fixing seats 62, and a fixing ring 64 is connected between the two fixing rods 63. The fixing ring 64 is connected to the surface of the cooling cylinder 3, and a bolt 65 is arranged on one side of the fixing ring 64.

[0079] When installing the cooling cylinder 3 , first install the cooling cylinder 3 at one end of the extruder body 2 , and at the same time, the fixing ring 64 at one end of the cooling cylinder 3 is sleeved on the surface of the extruder body 2 and fixed with bolts 65 .

[0080] The working principle of the porous lightweight thermal insulation polyester fiber provided by the present invention is as follows:

[0081] During use, when the material extruded by the extruder main body 2 is to be cooled, the water pump 42 is started to transport the liquid inside the water tank 41 to the inside of the cooling cylinder 3 through the two delivery pipes 43 and the connecting head 44, so that the material adhering to the inner wall of the cooling cylinder 3 can be cooled. After the liquid is transported to the cooling cylinder 3, it is transported to the inside of the water tank 41 through the installation head 51 and the circulation pipe 52 for circulation.

[0082] Compared with the related art, the porous lightweight thermal insulation polyester fiber provided by the present invention has the following beneficial effects:

[0083] The present invention provides a porous, lightweight, warm polyester fiber. A cooling cylinder 3 is arranged on one side of an extruder body 2 for use with a conveying device 4 and a circulation component 5. The liquid in the cooling cylinder 3 can be rotated to cool the raw materials extruded from the extruder body 2.

[0084] Third embodiment

[0085] Please refer to Figure 4 and Figure 5 Based on the porous lightweight thermal insulation polyester fiber provided in the first embodiment of the present application, the third embodiment of the present application proposes another porous lightweight thermal insulation polyester fiber. The third embodiment is only a preferred embodiment of the first embodiment, and the implementation of the third embodiment will not affect the independent implementation of the first embodiment.

[0086] Specifically, the third embodiment of the present application provides a porous lightweight thermal insulation polyester fiber. The difference is that, in the porous lightweight thermal insulation polyester fiber, a guide assembly 10 is arranged inside the feeding hopper 7, and the guide assembly 10 includes a guide bucket 101, and the bottom of the guide bucket 101 is connected to a card joint 102, and the interior of the guide bucket 101 is connected to a spiral guide plate 103.

[0087] The use of the spiral guide plate 103 facilitates guiding the direction of the material movement.

[0088] The working principle of the porous lightweight thermal insulation polyester fiber provided by the present invention is as follows:

[0089] During use, when the raw material is fed into the feeding hopper 7 and flows stably, the guide hopper 101 with the spiral guide plate 103 is installed in the feeding hopper 7 through the clamping joint 102 for use.

[0090] Compared with the related art, the porous lightweight thermal insulation polyester fiber provided by the present invention has the following beneficial effects:

[0091] The present invention provides a porous, lightweight, thermal-insulating polyester fiber. A guide bucket 101 with a clamping joint 102 and a spiral guide plate 103 is arranged inside a feed hopper 7, which can guide the material to enter the interior of an extruder body 2 along the rotation direction of the spiral guide plate 103, so that the material can better cooperate with the movement of the internal components of the extruder body 2 at the initial stage of entering the extruder body 2, thereby improving the stability of material transportation.

[0092] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A porous, lightweight, warm-keeping polyester fiber, characterized in that: Including the following ingredients: The dibasic acid, diol, esterification catalyst, nanoporous carbon material, long carbon chain diol, carbon material in-situ modified polyester masterbatch, polyester and aqueous solution are mixed.

2. The porous lightweight thermal insulation polyester fiber according to claim 1, characterized in that: The diol may be ethylene glycol, propylene glycol, butylene glycol or pentylene glycol.

3. A method for preparing porous, lightweight, thermal insulation polyester fiber, characterized in that: The following steps are involved: S1, the mixed dibasic acid is composed of sodium 5-sulfoisophthalic acid and one of terephthalic acid, isophthalic acid, adipic acid, succinic acid, and furandicarboxylic acid, and the molar fraction of sodium 5-sulfoisophthalic acid is 20-60% of the mixed dibasic acid; S2, the molar ratio of the mixed dibasic acid to the diol is 1:1.2-2.0 for esterification reaction, the esterification reaction temperature is 200-250°C, the esterification pressure is 0.01-0.1MPa, the esterification time is 2.5-5.0h, and 10-1000ppm of catalyst relative to the mixed dibasic acid is introduced into the esterification reaction; S3, when the esterification reaction of the dibasic acid and diol mixed in S2 is 80-90% completed, a certain mass fraction of nanoporous carbon material is introduced for further esterification, the amount of the nanoporous carbon material added is 5-50% of the mass of the mixed dibasic acid, and the intrinsic viscosity of the esterification product after the esterification reaction is completed is 0.15-0.20 dL / g; S4, after the esterification reaction in S3 is completed, a long carbon chain diol is introduced for pre-condensation, the pre-condensation reaction temperature is 220-265°C, the pre-condensation reaction pressure is 500-2000kPa, the pre-condensation reaction time is 0.5-2.0h, the relative molecular weight is 400-2000g / mol, the addition amount is 40-80% of the molar fraction of the esterification product, and the intrinsic viscosity of the pre-condensation reaction product after the pre-condensation reaction is completed is 0.20-0.35dL / g; S5, after the pre-polycondensation reaction in S4 is completed, the final polycondensation reaction is started, the final polycondensation reaction temperature is 240-285°C, the final polycondensation reaction pressure is 0-100kPa, the final polycondensation reaction time is 1.0-3.0h, wherein after the final polycondensation is completed, the intrinsic viscosity of the final polycondensation product is 0.50-0.60dL / g; S6, blending the carbon material in-situ modified polyester masterbatch and polyester in a certain ratio to form melt spinning, the intrinsic viscosity is 0.65-1.25 dL / g, and the mixing mass ratio of the carbon material in-situ modified polyester masterbatch and the polyester is 2:98-20:80; The carbon material in-situ modified polyester masterbatch in S7 and S6 is blended with polyester in a certain ratio and melt-spun to obtain a fiber, which is treated with an aqueous solution at a temperature of 50-100° C. for 3-30 min, and a mass ratio of fiber to solution of 1:10-1:50; S8, in S7, the fiber fineness is 1.0-5.0dtex, the mechanical breaking strength is 2.5-5.0cN / dtex, the breaking elongation is 10-40%, the fiber has a porous structure, the pore size is 50-500nm, the fiber specific surface area is increased by 1.5-5.0 times, the micropores have independent chambers, the far-infrared reflectivity is ≥95%, and the lightweight warmth retention is 5-20wt% lighter than the same specification polyester fiber.

4. The method for preparing the porous lightweight thermal insulation polyester fiber according to claim 3, characterized in that: The nanoporous carbon material in S3 has a particle size of 0.5-5 μm and a micropore size of 50-200 nm.

5. The method for preparing the porous lightweight thermal insulation polyester fiber according to claim 3, characterized in that: The long carbon chain diol in S4 may be polyethylene glycol, polypropylene glycol or polybutylene glycol.

6. The method for preparing the porous lightweight thermal insulation polyester fiber according to claim 3, characterized in that: The polyester in S6 may be polyethylene terephthalate, polypropylene terephthalate or polybutylene terephthalate.

7. The method for preparing the porous lightweight thermal insulation polyester fiber according to claim 1, characterized in that: An extrusion device is required for the melt spinning forming process in S6, and the extrusion device includes a workbench, an extruder body is installed on the surface of the workbench, a cooling cylinder is arranged at one end of the extruder body, a bottom plate is connected to one side of the workbench, a conveying device is arranged on the surface of the bottom plate, and the conveying device includes a water tank, a water pump is installed on one side of the water tank, and the input and output ends of the water pump are both connected to conveying pipes, one end of one of the conveying pipes is connected to a connector, and one end of the connector is connected to the cooling cylinder, a filling pipe is installed on one side of the top of the water tank, and a feeding hopper is connected to one side of the extruder body.

8. The method for preparing the porous lightweight thermal insulation polyester fiber according to claim 8, characterized in that: A circulation component is arranged between the cooling cylinder and the water tank. The circulation component comprises a mounting head. One end of the mounting head is connected to a circulation pipe. One end of the circulation pipe is connected to the water tank.

9. The method for preparing the porous lightweight thermal insulation polyester fiber according to claim 7, characterized in that: A fixing assembly is arranged between the cooling cylinder and the extruder body, and the fixing assembly includes a fixing hoop, and a fixing seat is symmetrically connected to the surface of the fixing hoop, one side of two fixing seats are connected to fixing rods, a fixing ring is connected between the two fixing rods, the fixing ring is connected to the surface of the cooling cylinder, and one side of the fixing ring is provided with bolts.

10. The method for preparing the porous light-weight thermal insulation polyester fiber according to claim 7, characterized in that: A guide assembly is arranged inside the feeding hopper, and the guide assembly comprises a guide bucket. A clamping joint is connected to the bottom of the guide bucket, and a spiral guide plate is connected to the inside of the guide bucket.

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