Soundproof polyester composite fiber and method for producing the same

Abstract

The application belongs to the technical field of sound insulation materials, and relates to a sound insulation polyester composite fiber and a preparation method thereof. The preparation method comprises the following steps: sequentially arranging polyester POY fibers and sound insulation polyester FDY fibers in parallel through a pre-network, a first roller, a first heat box and a cooling plate; then passing the polyester POY fibers through a false twister, and twisting the polyester POY fibers and the sound insulation polyester FDY fibers at a second roller; and then sequentially arranging the twisted polyester POY fibers and the sound insulation polyester FDY fibers through a network, an auxiliary roller, a second heat box, a third roller, an oiling device and a winding device to obtain the sound insulation polyester composite fiber. The sound insulation polyester FDY fibers are compounded with the polyester POY fibers to obtain the sound insulation polyester composite fiber. The sound insulation performance of the fiber is further enhanced, and the sound insulation polyester FDY fibers are fluffy and have a fuller pile feeling.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sound insulation materials, and relates to a sound insulation polyester composite fiber and a preparation method thereof. BACKGROUND

[0002] With the rapid development of modern industry and technology, the intensification of production activities inevitably brings about many environmental problems. As a kind of invisible public nuisance, noise pollution is increasingly becoming a major factor affecting people's quality of life, work efficiency and physical and mental health. Whether it is the quiet demand of the learning environment, the focused atmosphere of the workplace, or the high standard pursuit of sound quality in leisure and entertainment spaces such as recording studios, studios, cinemas, concert halls, etc., effective noise control measures are urgently needed.

[0003] Among the traditional noise control methods, sound-absorbing and sound-insulating materials play a crucial role. The mainstream sound-absorbing and noise-reducing materials on the market are mostly fine denier and porous polyester fiber products. This type of material can effectively capture and dissipate incident noise waves through its unique microstructure, i.e., a large number of interconnected small pores. When sound waves act on the surface of the material, they will excite the vibration of air molecules in the fibers and their interstices, and then convert sound energy into heat energy due to friction, viscous resistance and the thermal conductivity effect of the material, thereby significantly reducing the reflection intensity of sound and achieving sound insulation and noise reduction effects.

[0004] However, the existing technology, while pursuing high-efficiency sound insulation performance, also faces some insurmountable challenges. For example, a porous sound insulation material provided by the patent application with publication number CN108017360A effectively increases the porosity between fibers by adding inorganic additives such as gypsum and ceramic particles to polyester fibers, thereby improving the sound insulation effect. However, this approach sacrifices the physical strength of the material, and excessive additives lead to a decline in the overall mechanical properties of the fibers, affecting the durability and application range of the material.

[0005] The literature (Structure and sound absorption performance of composite needle-punched nonwoven fabric [J]. Nonwovens, 2009(4): 31-34) also points out that the fineness of the fibers has a direct impact on the sound absorption and sound insulation performance of the material. The finer the fibers, the higher the sound absorption and sound insulation coefficient of the material. However, excessive thinning of the fibers will result in a significant decline in fiber strength, which not only weakens the weaving and processing performance of the material, but also shortens its service life, limiting the promotion of this type of high-performance material in practical applications.

[0006] In summary, the technical problems to be solved in the field of sound-absorbing and sound-insulating materials at present are how to further improve the sound-insulating effect without sacrificing the physical strength and processing performance of the materials, and how to develop new sound-absorbing and sound-insulating materials that are efficient and durable to meet the growing demand for noise control. SUMMARY

[0007] The purpose of the present application is to solve the problems existing in the prior art and provide a sound-insulating polyester composite fiber and a preparation method thereof.

[0008] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0009] A preparation method of a sound-insulating polyester FDY fiber, comprising a spinning assembly spinning process, a circular blowing air cooling process, a stretching process, a setting process and a main network process, in the spinning assembly, the number of spinning holes on the spinneret plate is 96-144, which is divided into two types;

[0010] Both types of spinning holes are five-leaf-shaped, which is composed of a circle and 5 long leaves connected with the circle and distributed in a radial manner, the diameter of the circle is 0.23±0.01mm, and the included angle between adjacent two leaves is 72°;

[0011] The leaf length of the first type of spinning hole is 0.4mm, and the leaf width is 0.055mm; the leaf length of the second type of spinning hole is 0.4mm, and the leaf width is 0.03mm;

[0012] The number ratio of the first type of spinning hole to the second type of spinning hole is 1-2:1;

[0013] The diameter of the spinneret plate is 95-105mm;

[0014] The stretching is completed by the first, second and third heat rollers, and the temperature of the first and second heat rollers is 90-94℃;

[0015] The setting is completed by the third and fourth heat rollers;

[0016] The air pressure of the main network is 0.55-0.6MPa.

[0017] In the present application, the size of the two types of spinning holes is designed, so that the filament fineness of the filaments extruded from the first type of spinning hole is relatively large, and the relative radial anisotropy is relatively small, which is recorded as single A; the filament fineness of the filaments extruded from the second type of spinning hole is relatively small, and the relative radial anisotropy is relatively large, which is recorded as single B;

[0018] Controlling the temperature of the first and second heat rollers and the air pressure of the main network can make the surface of the sound-insulating polyester FDY fiber (a multifilament composed of multiple single A and multiple single B) have hair, and the reason is as follows:

[0019] When monofilament A and monofilament B pass through the first heat roller and the second heat roller, the two are prone to crystallization setting due to the high temperature of the first heat roller and the second heat roller, and when subsequently stretched and set, monofilament B with relatively small monofilament fineness and relatively large relative radial irregularity is prone to linting, while monofilament A with relatively large monofilament fineness and relatively small relative radial irregularity is not prone to linting.

[0020] When the main network is carried out, monofilament B with relatively small monofilament fineness and relatively large relative radial irregularity is more prone to breaking than monofilament A with relatively large monofilament fineness and relatively small relative radial irregularity, and by controlling the air pressure of the main network, monofilament B can be broken while being entangled with monofilament A to form dense and uniform lint on the surface of the soundproof polyester FDY fiber, and monofilament A does not break, thereby ensuring the strength of the soundproof polyester FDY fiber.

[0021] When the diameter of the spinneret is large (95-105 mm), the heat dissipation speed of the plate surface is fast, the plate surface temperature is relatively low, which is equivalent to a fast cooling speed, and the relative radial irregularity is higher, and when passing through the main network, monofilament B is more prone to linting.

[0022] Controlling the number ratio of the first type of spinneret hole to the second type of spinneret hole can ensure that the soundproof polyester FDY fiber has high strength and stable post-processing performance.

[0023] The fabric containing the soundproof polyester FDY fiber has good sound insulation performance, and the main reasons are as follows:

[0024] ① The cross section of the monofilament in the soundproof polyester FDY fiber is five-leaf-shaped, and the five-leaf-shaped edges are more, when sound propagates to the inside of the fabric, it will cause the vibration of the fiber and the air between the fibers, due to this vibration, more friction will occur between the air and the fiber, and this friction will weaken the sound;

[0025] ② The cross section of the monofilament in the soundproof polyester FDY fiber is five-leaf-shaped, and the number of five-leaf-shaped blades is relatively large, when sound propagates to the surface of the fiber, it will produce more diffuse reflection (after one incidence and multiple reflections), and due to the misalignment of the sound waves of different reflections, the sound waves can weaken each other and even cancel each other out, and multiple reflections equivalent to increase the sound propagation path, thereby weakening the sound.

[0026] ③ The number of monofilaments in the soundproof polyester FDY fiber is large (96-144), and the cross section of the monofilament is five-leaf-shaped and small in size, so that the specific surface area of the soundproof polyester FDY fiber is large, and the sound waves are more strongly affected when the sound propagates, thereby the sound weakening effect is stronger.

[0027] (4) The surface of the soundproof polyester FDY fiber is distributed with fluff, which presents a curved hair shape and is easy to resonate with sound waves and absorb energy, thereby reducing the intensity of sound waves. At the same time, the fabric is more fluffy, which is equivalent to increasing the fabric density and thickness, and also equivalent to increasing the sound propagation path, thereby achieving better soundproofing and sound absorption effects.

[0028] As a preferred technical solution:

[0029] The preparation method of the soundproof polyester FDY fiber as described above, all the spinnerets are arranged in a concentric circle on the spinneret plate, the first type of spinnerets are arranged in the outer circle of the spinneret plate, and the second type of spinnerets are arranged in the inner circle of the spinneret plate. In this way, under the same cooling air pressure condition, the filaments B can be uniformly cooled, while the filaments A will appear a slight insufficient cooling condition, so that the breaking elongation and boiling water shrinkage are higher.

[0030] The preparation method of the soundproof polyester FDY fiber as described above, in the spinning assembly, the filtering sand adopts 150-180g (total mass of metal sand) and 50-70 mesh metal sand.

[0031] The mesh number of the metal sand selected in the present application is appropriate, which can not only ensure the filtering precision, but also avoid the instant increase of the melt temperature caused by the high pressure of the spinning assembly, thereby affecting the relative radial profile of the fiber.

[0032] The preparation method of the soundproof polyester FDY fiber as described above, the spinning temperature is 286-290℃.

[0033] The spinning temperature of the present application is lower, which can increase the relative radial profile of the fiber on the one hand, and increase the puffing effect of the polyester melt at the spinneret on the other hand, so that the filaments B have a smaller residual elongation and a relatively low breaking strength after the stretching is completed in the spinning process, which makes it easier to produce uniform fluff when subjected to high pressure impact of the main network.

[0034] The preparation method of the soundproof polyester FDY fiber as described above, the cooling air pressure of the ring blowing air cooling is 35-40Pa, the length of the cooling air cylinder is 48-50cm, and the height of the slow cooling area is 55-60mm.

[0035] The specific cooling air pressure, cooling air cylinder length and slow cooling area height make the filaments B be cooled properly, while the filaments A are not cooled properly, and the breaking elongation and boiling water shrinkage are both larger. After weaving, the filaments A with high boiling water shrinkage present small loop floating on the surface of the fabric, which has a fluffy effect and can make the end surface of the fabric more dense, thereby improving the soundproof performance.

[0036] The preparation method of the soundproof polyester FDY fiber as described above, the speed ratio (i.e. the stretching multiple) of the third hot roller to the first hot roller is 2.0-2.5.

[0037] Monofilament B is prone to produce low-strength and low-elongation monofilament due to a large draw ratio during the drawing process, and is more prone to produce hair after high-pressure blowing of the main network.

[0038] The preparation method of the soundproof polyester FDY fiber as described above has an overall process flow as follows: melt extrusion through a metering pump, spinning through a spinning assembly, air cooling through a ring blowing, first oiling, first pre-networking, a first godet roll, a first heat roll, a second heat roll, a third heat roll, a fourth heat roll, a second godet roll, second oiling, second pre-networking, main networking, a third godet roll, and winding into a shape.

[0039] The preparation method of the soundproof polyester FDY fiber as described above has the first pre-networking position located at 130-140 cm below the spinneret, the air pressure of the first pre-networking being 0.03-0.04 MPa, and the air pressure of the second pre-networking being 0.1-0.15 MPa.

[0040] The pre-networking treatment of the tow can improve the bundling and cohesion of the fibers, and the hair after the main network blowing can be largely cohered and not fall off in the tow. The air pressure of the second pre-networking is slightly higher due to the high speed and relatively large tension of the tow at the second pre-networking position.

[0041] The present application also provides a soundproof polyester FDY fiber prepared by the preparation method of the soundproof polyester FDY fiber as described above, the surface of the soundproof polyester FDY fiber being distributed with hair, the length of the hair being 0.5-1.0 cm, the hair being curved and the radius of the curvature being 2-4 cm; the breaking strength of the soundproof polyester FDY fiber being ≥3.84 cN / dtex, the breaking elongation being 28.8-32.7%, the differential shrinkage being 12.4-18.2%, the relative radial differential shape being ≥24.7% (a high relative radial differential shape represents a longer leaf length of the five leaves, and a good sound absorption effect), the oil content being 0.39-0.45%, and the hair rate being ≥91.5%.

[0042] The present application also provides a preparation method of a soundproof polyester composite fiber, the polyester POY fiber and the soundproof polyester FDY fiber being sequentially and in parallel subjected to pre-networking, a first roller, a first heat box, a cooling plate, the polyester POY fiber being subjected to a false twister, and then being plied with the soundproof polyester FDY fiber at a second roller, and then being sequentially subjected to networking, an auxiliary roller, a second heat box, a third roller, oiling, and winding into a shape to obtain the soundproof polyester composite fiber.

[0043] The soundproof polyester FDY fiber is the soundproof polyester FDY fiber as described above.

[0044] The temperature of the first heat box is 150-160 DEG C.

[0045] Since the soundproof polyester FDY fiber has a five-leaf shaped cross section, its breaking strength is relatively low, and the surface of the fiber bundle is distributed with fluff, which is easy to accumulate hairiness in the subsequent weaving process. If the gill accumulates too much hairiness, it is easy to break. At the same time, if the soundproof polyester FDY fiber is directly used in the subsequent weaving process, since the fiber bundle is not subjected to plasticization by the further high-temperature heat box, the hairiness effect does not present a good bending state, and the soundproof effect is relatively poor. Therefore, the soundproof polyester FDY fiber is compounded with the polyester POY fiber to obtain a soundproof polyester composite fiber, and then the soundproof polyester composite fiber is used as the fiber raw material for weaving fabric.

[0046] The existing technology for producing composite fibers mainly has two processes:

[0047] ①The FDY fiber is networked with the POY fiber which sequentially passes through a pre-networking, a first roller, a first heat box, a cooling plate, a false twister, and a second roller, and then passes through an auxiliary roller, a second heat box, a third roller, oiling, and winding to form an inharmonic fiber;

[0048] ②The POY fiber is networked with the FDY fiber, and then sequentially passes through a first roller, a first heat box, a cooling plate, a false twister, a second roller, a second heat box, a third roller, oiling, and winding to form a cotton-like fiber.

[0049] The process for producing the composite fiber of the present application is different from the existing technology. On the one hand, the FDY fiber of the present application has passed through a first heat box before being compounded with the POY fiber, which is to make the FDY fiber have better loftiness and more fullness of pile, and the temperature of the first heat box needs to be appropriate. If the temperature of the first heat box is too high, the fluff of the soundproof polyester FDY fiber is easy to break, and if the temperature of the first heat box is too low, the polyester POY fiber is not softened enough, and the fluff is easy to break when passing through the false twister. On the other hand, the FDY fiber of the present application does not pass through the false twister, because the FDY fiber of the present application has a lot of fluff, and if it passes through the false twister, it is easy to break.

[0050] As a preferred technical solution:

[0051] The soundproof polyester composite fiber preparation method described above, the speed of the second roller is 600-620 m / min, the speed of the second roller is relatively low, mainly to ensure the stability of production and the characteristics of product pile, so that the two bundles of yarn have good cohesion.

[0052] The soundproof polyester composite fiber preparation method described above, the speed ratio of the second roller to the first roller is 1.65-1.68, and the ratio of the surface linear speed of the friction disc of the false twister to the speed of the second roller is 1.60-1.65, which is mainly used for the false twist texturing of the polyester POY fiber.

[0053] The temperature of the second hot box is 175-185 DEG C, and the main role is to shape.

[0054] The soundproof polyester composite fiber prepared by the method has a breaking strength of greater than or equal to 3.25 cN / dtex, an elongation at break of 14.1-15.9%, an oil content of 2.8-3.2%, a crimp shrinkage of 14.3-15.7% (ensuring the fluffy of the crimp of the fiber), a crimp stability of greater than or equal to 78.6%, and a hairiness rate of greater than or equal to 91.6%. The sound absorption coefficient a of the fabric prepared from the soundproof polyester composite fiber is greater than or equal to 0.22.

[0055] Advantages:

[0056] (1) The soundproof polyester FDY fiber composed of the single yarn A with a larger single yarn fineness and a smaller profile degree and the single yarn B with a smaller single yarn fineness and a larger profile degree is prepared by designing two types of different sizes and profile degrees of the spinning holes, so that the dense and uniform hair is formed on the fiber surface, the specific surface area of the fiber is increased, the interaction with the sound wave is enhanced, and the soundproof performance is significantly improved.

[0057] (2) The single yarn B is easily broken and entangled with the single yarn A during the stretching process by precisely controlling the parameters such as the air pressure of the first hot roller, the second hot roller and the main network, so that the ideal hair effect is formed, and the integrity of the single yarn A is ensured, so that the soundproof performance is improved without sacrificing the strength of the fiber.

[0058] (3) The soundproof polyester FDY fiber is compounded with the polyester POY fiber to obtain the soundproof polyester composite fiber, which not only further enhances the soundproof performance of the fiber, but also makes the soundproof polyester FDY fiber fluffy and the pile feeling more full through the preparation process of the composite fiber. At the same time, the soundproof polyester FDY fiber and its composite fiber are not easy to break in the subsequent weaving process, and are easy to process into various shapes and sizes of soundproof materials to meet the noise control requirements of different occasions. BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 The distribution of the spinning holes on the spinning plate used in Example 1 is shown in the figure;

[0060] Figure 2 The shape of the two types of spinning holes in Example 2 is shown in the figure; Figure 1

[0061] The shape of the two types of spinning holes in Comparative Example 3 is shown in the figure; Figure 3

[0062] Figure 4 ​A schematic view of the distribution of the spinning holes on the spinneret used in Example 5;

[0063] In the figure, A represents the first type of spinning hole, B represents the second type of spinning hole, d1 represents the length of the leaf, d2 represents the width of the leaf, and d3 represents the diameter of the circle constituting the five-leaf shape. DETAILED DESCRIPTION

[0064] The application will be further described in conjunction with the specific embodiments. It should be understood that these embodiments are only used to illustrate the application and not to limit the scope of the application. Furthermore, it should be understood that those skilled in the art can make various modifications or changes to the application after reading the content taught by the application, and these equivalent forms also fall within the scope defined by the claims attached hereto.

[0065] The following are the test methods of the relevant performance indicators in each example and comparative example:

[0066] Presence or absence of fluff: the presence of single yarn breakage on the surface of each yarn roll is observed by appearance.

[0067] Length of fluff: observed by appearance and measured with a ruler.

[0068] Bending radius of fluff: observed by appearance and measured with a ruler.

[0069] Breaking strength and elongation at break: according to the standard of "Chemical Fiber Filament Tensile Property Test Method" (GB / T 14344-2022), the breaking elongation of the yarn bundle is tested by using YG023B-II type full-automatic single yarn strength machine. The specific process is as follows: first, the yarn bundle is placed in an environment with temperature (20±2)℃ and humidity (65±5)% for 4h for moisture conditioning; then, the full-automatic single yarn strength machine is used for tensile test. Before the test, the clamping length of the yarn bundle is accurately set to (500±1.0)mm by the upper and lower clamps, and a pre-tension (0.05±0.005cN / dtex) is applied by the mechanical hand to stabilize the yarn bundle; during the test, the lower clamp is stretched at a constant speed (500mm / min) until the yarn bundle breaks; during the stretching process, the force sensor records the data in real time, and the relationship curve between the strength and the elongation is drawn by the data collection system; finally, the breaking strength and the breaking elongation of the yarn bundle are obtained by data processing analysis.

[0070] Different shrinkage: tested according to the standard of "Test Method for Different Shrinkage of Polyester Pre-oriented Yarn Drawn Yarn Mixed Filament" (FZ / T 50023-2014).

[0071] Relative radial irregularity: according to the Chemical Fiber Irregularity Test Method (FZ / T 50002-2013), the cross section of the fiber is enlarged by a microscope, the radius of the inscribed circle and the radius of the circumscribed circle in the fiber cross section are calculated, and the relative radial irregularity D is calculated according to the following formula R :

[0072] D R =(1-r / R)×100%;

[0073] In the formula, r is the radius of the inscribed circle in the fiber cross section (mm), and R is the radius of the circumscribed circle in the fiber cross section (mm).

[0074] Oil content: according to the Chemical Fiber Oil Content Test Method (GB / T 6504-2017) standard, about 2g sample is taken, and MQC23-10 type nuclear magnetic resonance oil content analyzer is used for testing.

[0075] Hairiness rate: hairiness rate = total number of hairiness × 100 % / total number.

[0076] Crushing shrinkage and crimp stability: according to the Synthetic Fiber Textured Yarn Crimping Property Test Method (GB / T 6506-2017) standard, YG368 type full-automatic filament crimping rate tester is used for testing.

[0077] Sound absorption coefficient a: first, the sample to be tested is woven into a fabric by a circular machine, and then tested according to GB / T 18696.1 Acoustics-Determination of sound absorption coefficient by the reverberation room method-Part 1: Measurement of absorption in a reverberation room.

[0078] Example 1

[0079] A sound insulation polyester FDY fiber preparation method, the overall process flow is: melt is extruded by a metering pump → spinning assembly spinning → circular blowing air cooling → first oiling → first pre-networking → first godet → first hot roller → second hot roller → third hot roller → fourth hot roller → second godet → second oiling → second pre-networking → main networking → third godet → winding forming;

[0080] The preparation process of the melt is: slurry preparation → first esterification → second esterification → pre-polycondensation → final polycondensation → polyester melt (intrinsic viscosity 0.620 dL / g); the related process parameters are: slurry liquid level 69%, the mass of PTA in the slurry accounts for 69% of the total mass of PTA and EG; first esterification temperature 268℃, first esterification pressure 90kPa, second esterification temperature 270℃, second esterification pressure 30kPa, pre-polycondensation upper chamber temperature 278℃, pre-polycondensation upper chamber pressure 35kPa, pre-polycondensation lower chamber temperature 280℃, pre-polycondensation lower chamber pressure 1.8kPa, final polycondensation inlet temperature 280℃, final polycondensation outlet temperature 286℃, final polycondensation vacuum degree 160Pa;

[0081] In the spinning assembly, the diameter of the spinneret is 105 mm; the spinneret holes on the spinneret are divided into two types, and both types of the spinneret holes are five-leaf shapes, as shown in Figure 2 The five-leaf shape is composed of a circle and 5 long leaves connected with the circle and distributed in a radial manner, the diameter of the circle is 0.23 mm, and the included angle between two adjacent leaves in the five-leaf shape is 72°; the leaf length of the first type of the spinneret hole is 0.4 mm, and the leaf width is 0.055 mm; the leaf length of the second type of the spinneret hole is 0.4 mm, and the leaf width is 0.03 mm; as shown in Figure 1 The centers of all the spinneret holes are distributed in concentric circles on the spinneret, and there are 6 circles, the spinneret holes on each circle are uniformly distributed, the first circle appearing from the inside to the outside is recorded as the 1st circle, the diameter of the 1st circle is 20 mm, there are 8 second type of the spinneret holes distributed on the 1st circle, the diameter of the 2nd circle is 33 mm, there are 14 second type of the spinneret holes distributed on the 2nd circle, the diameter of the 3rd circle is 46 mm, there are 22 second type of the spinneret holes distributed on the 3rd circle, the diameter of the 4th circle is 59 mm, there are 28 second type of the spinneret holes distributed on the 4th circle, the diameter of the 5th circle is 72 mm, there are 36 first type of the spinneret holes distributed on the 5th circle, and the diameter of the 6th circle is 86 mm, there are 36 first type of the spinneret holes distributed on the 6th circle;

[0082] In the spinning assembly, 180 g of metal sand with a mesh size of 50-70 is used as the filtering sand; the spinning temperature is 286℃;

[0083] The cooling air pressure of the ring blowing air cooling is 40 Pa, the length of the cooling air cylinder is 50 cm, and the height of the slow cooling zone is 60 mm;

[0084] The position of the first pre-networking is 130 cm below the spinneret, and the air pressure of the first pre-networking is 0.04 MPa;

[0085] The temperature of the first heat roller is 90℃;

[0086] The temperature of the second heat roller is 90℃;

[0087] The speed ratio of the third heat roller to the first heat roller is 2.1;

[0088] The air pressure of the second pre-networking is 0.15 MPa;

[0089] The air pressure of the main networking is 0.55 MPa.

[0090] The soundproof polyester FDY fiber prepared finally has hair on the surface, the length of the hair is 0.5 cm, the hair is curved and the bending radius is 2 cm; the breaking strength of the soundproof polyester FDY fiber is 3.87 cN / dtex, the breaking elongation is 31.6%, the differential shrinkage is 18.2%, the relative radial anisotropy is 30.4%, the oil content is 0.45%, and the hair rate is 96.7%.

[0091] A soundproof polyester composite fiber is prepared by the following steps: polyester POY fiber (the specification is 82 dtex / 48 f, and the physical indexes are: breaking strength 2.64 cN / dtex, breaking elongation 131.8%, CV value of slub unevenness 1.03%, and oil content 0.34%) and the soundproof polyester FDY fiber prepared in the embodiment are parallel and sequentially passed through a pre-network, a first roller, a first heat box, a cooling plate, the polyester POY fiber is passed through a false twister, and then the polyester POY fiber and the soundproof polyester FDY fiber are plied at a second roller, and then sequentially passed through a network, an auxiliary roller, a second heat box, a third roller, oiling, and winding to form the soundproof polyester composite fiber.

[0092] The polyester POY fiber and the soundproof polyester FDY fiber are both 1 bundle; the temperature of the first heat box is 160 ℃; the speed of the second roller is 600 m / min, the speed ratio of the second roller to the first roller is 1.65, the ratio of the surface linear speed of the friction disc of the false twister to the speed of the second roller is 1.6; and the temperature of the second heat box is 185 ℃.

[0093] The soundproof polyester composite fiber prepared finally has the breaking strength of 3.25 cN / dtex, the breaking elongation of 14.7%, the oil content of 3.2%, the crimping shrinkage of 15.7%, the crimping stability of 80.8%, and the hair rate of 96.8%; the sound absorption coefficient a of the fabric prepared from the soundproof polyester composite fiber is 0.54.

[0094] Comparative Example 1

[0095] A polyester FDY fiber is prepared by the following steps: the centers of all the spinning orifices are distributed in concentric circles on the spinning plate, and there are 6 circles, the spinning orifices on each circle are uniformly distributed, the first circle appearing from the inside to the outside is recorded as the first circle, the diameter of the first circle is 20 mm, there are 4 second type spinning orifices on the first circle, the diameter of the second circle is 33 mm, there are 7 second type spinning orifices on the second circle, the diameter of the third circle is 46 mm, there are 11 second type spinning orifices on the third circle, the diameter of the fourth circle is 59 mm, there are 14 second type spinning orifices on the fourth circle, the diameter of the fifth circle is 72 mm, there are 18 first type spinning orifices on the fifth circle, and the diameter of the sixth circle is 86 mm, and there are 18 first type spinning orifices on the sixth circle.

[0096] A method for preparing a polyester composite fiber, and the difference from Example 1 is that the soundproof polyester FDY fiber prepared in Example 1 is replaced with the polyester FDY fiber prepared in the present comparative example.

[0097] The sound absorption coefficient a of the fabric finally prepared from the polyester composite fiber is 0.18.

[0098] Compared with Example 1, the sound absorption coefficient a of the fabric prepared from the polyester composite fiber in Comparative Example 1 is obviously reduced, because the number of the spinning holes on the spinneret in Comparative Example 1 is too low, which means the number of the filaments of the polyester FDY fiber is too small, and then the specific surface area thereof is relatively small. When the sound propagates, the sound wave cannot interact with the fiber strongly, and cannot effectively weaken the sound, which is manifested as the sound absorption coefficient a of the fabric is obviously reduced.

[0099] Comparative Example 2

[0100] A method for preparing a polyester FDY fiber, and the difference from Example 1 is that both of the two types of spinning holes are four-leaf-shaped, and the included angle between the adjacent two leaves is 90°.

[0101] A method for preparing a polyester composite fiber, and the difference from Example 1 is that the soundproof polyester FDY fiber prepared in Example 1 is replaced with the polyester FDY fiber prepared in the present comparative example.

[0102] The sound absorption coefficient a of the fabric finally prepared from the polyester composite fiber is 0.14.

[0103] Compared with Example 1, the sound absorption coefficient a of the fabric prepared from the polyester composite fiber in Comparative Example 2 is obviously reduced, because both of the two types of spinning holes adopted in Comparative Example 2 are four-leaf-shaped, and the four-leaf-shaped has less edges and corners. When the sound propagates to the inside of the fabric, the vibration of the fiber and the air between the fibers caused by the sound is weak, which cannot effectively weaken the sound, which is manifested as the sound absorption coefficient a of the fabric is obviously reduced.

[0104] Comparative Example 3

[0105] A method for preparing a polyester FDY fiber, and the difference from Example 1 is that the angles of the five leaves of the two types of five-leaf-shaped spinning holes are as shown in Figure 3 .

[0106] Compared with Example 1, the relative radial anisotropy of the polyester FDY fiber in Comparative Example 3 is obviously reduced, because the angles of the five leaves of the two types of five-leaf-shaped spinning holes in Comparative Example 3 are different, and the several leaves with smaller included angle are affected by the swelling of the melt after being extruded from the spinneret, which leads to a lower relative radial anisotropy.

[0107] A method for preparing a polyester composite fiber, and the only difference between Example 1 is that the sound insulation polyester FDY fiber prepared in Example 1 is replaced by the polyester FDY fiber prepared in this comparative example.

[0108] The sound absorption coefficient a of the fabric finally prepared from the polyester composite fiber is 0.19.

[0109] Compared with Example 1, the sound absorption coefficient a of the fabric prepared from the polyester composite fiber in Comparative Example 3 is significantly reduced, because the angles of the five leaves of the two types of five-leaf-shaped spinnerets used in Comparative Example 3 are different, and the smaller angle of the several leaves affects the swelling of the melt after extrusion from the spinneret, resulting in a lower relative radial anisotropy of the polyester FDY fiber, i.e. the cross-section of the fiber tends to be circular, and the edges of the fiber surface are correspondingly reduced, affecting the sound absorption effect.

[0110] Comparative Example 4

[0111] A method for preparing a polyester FDY fiber, and the only difference between Example 1 is that the centers of all the spinnerets are arranged in concentric circles on the spinneret, a total of 6 circles, the spinnerets on each circle are uniformly distributed, the first appearing circle from the inside to the outside is called the 1st circle, the diameter of the 1st circle is 20mm, there are 8 second type spinnerets on the 1st circle, the diameter of the 2nd circle is 33mm, there are 14 second type spinnerets on the 2nd circle, the diameter of the 3rd circle is 46mm, there are 22 second type spinnerets on the 3rd circle, the diameter of the 4th circle is 59mm, there are 28 second type spinnerets on the 4th circle, the diameter of the 5th circle is 72mm, there are 36 second type spinnerets on the 5th circle, the diameter of the 6th circle is 86mm, and there are 36 first type spinnerets on the 6th circle.

[0112] A method for preparing a polyester composite fiber, and the only difference between Example 1 is that the sound insulation polyester FDY fiber prepared in Example 1 is replaced by the polyester FDY fiber prepared in this comparative example.

[0113] The sound absorption coefficient a of the fabric finally prepared from the polyester composite fiber is 0.19.

[0114] Compared with Example 1, the sound absorption coefficient a of the fabric prepared from the polyester composite fiber in Comparative Example 4 is significantly reduced, because in Comparative Example 4, the number of second type spinnerets is too high, i.e. the proportion of single yarn B is too high, the single yarn B has a relatively small fineness and a relatively large relative radial anisotropy, and the strength is weak, which affects the strength of the polyester FDY fiber, leading to easy single yarn breakage during subsequent compounding with the polyester POY fiber, which will result in poor structure stability of the composite fiber and affect the sound absorption effect.

[0115] Comparative Example 5

[0116] A method for preparing a polyester FDY fiber, and the difference between Example 1 is that the temperature of the first and second heat rollers is 85℃.

[0117] A method for preparing a polyester composite fiber, and the difference between Example 1 is that the soundproof polyester FDY fiber prepared in Example 1 is replaced with the polyester FDY fiber prepared in the present comparative example.

[0118] The sound absorption coefficient a of the fabric finally prepared from the polyester composite fiber is 0.17.

[0119] Compared with Example 1, the sound absorption coefficient a of the fabric prepared from the polyester composite fiber in Comparative Example 5 is significantly reduced, because the temperature of the first and second heat rollers in Comparative Example 5 is too low, resulting in insufficient crystallization setting of the filaments A and B, affecting the stability of the internal structure of the fiber, and the filament B is not prone to hairiness, affecting the sound absorption effect.

[0120] Comparative Example 6

[0121] A method for preparing a polyester FDY fiber, and the difference between Example 1 is that the air pressure of the main network is 0.5MPa.

[0122] A method for preparing a polyester composite fiber, and the difference between Example 1 is that the soundproof polyester FDY fiber prepared in Example 1 is replaced with the polyester FDY fiber prepared in the present comparative example.

[0123] The sound absorption coefficient a of the fabric finally prepared from the polyester composite fiber is 0.19.

[0124] Compared with Example 1, the sound absorption coefficient a of the fabric prepared from the polyester composite fiber in Comparative Example 6 is significantly reduced, because the air pressure of the main network in Comparative Example 6 is too low, making it difficult for the filament B with relatively small filament size and relatively large relative radial anisotropy to be fully broken and entangled with the filament A, and the filament B cannot form dense and uniform hair on the surface of the polyester FDY fiber, resulting in weakening of the resonance and energy absorption effect with the sound wave, and reduction of the sound absorption coefficient a of the fabric.

[0125] Example 2

[0126] A method for preparing a soundproof polyester FDY fiber, the overall process flow is: melt is extruded through a metering pump → spun by a spinning assembly → cooled by a ring blowing air → first oiling → first pre-networking → first godet roller → first heat roller → second heat roller → third heat roller → fourth heat roller → second godet roller → second oiling → second pre-networking → main network → third godet roller → winding and forming;

[0127] The preparation process of the melt is: slurry preparation→first esterification→second esterification→pre-polycondensation→final polycondensation→polyester melt (intrinsic viscosity 0.630 dL / g); the related process parameters are: slurry liquid level 70%, the mass of PTA in the slurry accounts for 69.5% of the total mass of PTA and EG; first esterification temperature 270 ℃, first esterification pressure 105 kPa, second esterification temperature 278 ℃, second esterification pressure 40 kPa, pre-polycondensation upper chamber temperature 282 ℃, pre-polycondensation upper chamber pressure 38 kPa, pre-polycondensation lower chamber temperature 285 ℃, pre-polycondensation lower chamber pressure 1.9 kPa, final polycondensation inlet temperature 282 ℃, final polycondensation outlet temperature 288 ℃, final polycondensation vacuum degree 250 Pa;

[0128] In the spinning pack, the diameter of the spinneret is 95 mm; the spinning holes on the spinneret are divided into two types, both of which are five-leaf shapes, the five-leaf shape is composed of a circle and 5 long leaves connected with the circle and distributed in a radial manner, the diameter of the circle is 0.22 mm, and the included angle between two adjacent leaves in the five-leaf shape is 72°; the leaf length of the first type of spinning hole is 0.4 mm, and the leaf width is 0.055 mm; the leaf length of the second type of spinning hole is 0.4 mm, and the leaf width is 0.03 mm; the centers of all the spinning holes are distributed in concentric circles on the spinneret, and there are 4 circles, the spinning holes on each circle are uniformly distributed, the first circle appearing from the inside to the outside is recorded as the 1st circle, the diameter of the 1st circle is 36 mm, there are 14 second type of spinning holes distributed on the 1st circle, the diameter of the 2nd circle is 49 mm, there are 20 second type of spinning holes distributed on the 2nd circle, the diameter of the 3rd circle is 62 mm, there are 28 first type of spinning holes distributed on the 3rd circle, the diameter of the 4th circle is 75 mm, and there are 34 first type of spinning holes distributed on the 4th circle;

[0129] In the spinning pack, 180 g of metal sand with a mesh size of 50-70 is used as the filtering sand; the spinning temperature is 287 ℃;

[0130] The cooling air pressure of the ring blowing air cooling is 38 Pa, the length of the cooling air cylinder is 49 cm, and the height of the slow cooling zone is 58 mm;

[0131] The first pre-networking position is located 132 cm below the spinneret, and the air pressure of the first pre-networking is 0.04 MPa;

[0132] The temperature of the first heat roller is 94 ℃;

[0133] The temperature of the second heat roller is 94 ℃;

[0134] The speed ratio of the third heat roller to the first heat roller is 2.3;

[0135] The air pressure of the second pre-networking is 0.14 MPa;

[0136] The air pressure of the main network is 0.6 MPa.

[0137] The soundproof polyester FDY fiber prepared finally has hair on the surface, the length of the hair is 0.8 cm, the hair is curved and the radius of the curvature is 2.5 cm; the breaking strength of the soundproof polyester FDY fiber is 3.92 cN / dtex, the breaking elongation is 30.4%, the differential shrinkage is 16.7%, the relative radial anisotropy is 32.6%, the oil content is 0.43%, and the hair rate is 95.4%.

[0138] A soundproof polyester composite fiber is prepared by the following steps: polyester POY fiber (the specification is 82 dtex / 48 f, and the physical indexes are: breaking strength 2.64 cN / dtex, breaking elongation 131.8%, CV value of slub unevenness 1.03%, and oil content 0.34%) and the soundproof polyester FDY fiber prepared in the embodiment are parallel and sequentially passed through a pre-network, a first roller, a first heat box, a cooling plate, the polyester POY fiber is passed through a false twister, and then the polyester POY fiber and the soundproof polyester FDY fiber are plied at a second roller, and then sequentially passed through a network, an auxiliary roller, a second heat box, a third roller, oiling, and winding to form the soundproof polyester composite fiber.

[0139] The polyester POY fiber and the soundproof polyester FDY fiber are both 1 bundle; the temperature of the first heat box is 150 ℃; the speed of the second roller is 600 m / min, the speed ratio of the second roller to the first roller is 1.68, and the ratio of the surface linear speed of the friction disc of the false twister to the speed of the second roller is 1.63; and the temperature of the second heat box is 185 ℃.

[0140] The soundproof polyester composite fiber prepared finally has a breaking strength of 3.39 cN / dtex, a breaking elongation of 14.1%, an oil content of 3%, a crimping shrinkage rate of 14.9%, a crimping stability of 79.3%, and a hair rate of 96.1%; and the sound absorption coefficient a of the fabric prepared from the soundproof polyester composite fiber is 0.4.

[0141] Comparative Example 7

[0142] A polyester FDY fiber is prepared by the following steps: the difference between the polyester FDY fiber and the polyester FDY fiber prepared in Example 2 is that the centers of all the spinneret holes are arranged in concentric circles on the spinneret plate, and there are four circles, the spinneret holes on each circle are uniformly distributed, the first circle appearing from the inside to the outside is recorded as the first circle, the diameter of the first circle is 36 mm, there are 14 second type spinneret holes on the first circle, the diameter of the second circle is 49 mm, there are 20 first type spinneret holes on the second circle, the diameter of the third circle is 62 mm, there are 28 first type spinneret holes on the third circle, and the diameter of the fourth circle is 75 mm, and there are 34 first type spinneret holes on the fourth circle.

[0143] A method for preparing a polyester composite fiber, and the difference between example 2 is only that the sound insulation polyester FDY fiber prepared in example 2 is replaced with the polyester FDY fiber prepared in the present comparative example.

[0144] The sound absorption coefficient a of the fabric finally prepared from the polyester composite fiber is 0.08.

[0145] Compared with example 2, the sound absorption coefficient a of the fabric prepared from the polyester composite fiber in comparative example 7 is significantly reduced, because the number of the second type of spinneret in comparative example 7 is too small, that is, the proportion of monofilament B is too low, which cannot form enough hair, resulting in poor sound absorption effect of the fabric.

[0146] Comparative example 8

[0147] A method for preparing a polyester FDY fiber, and the difference between example 2 is only that the air pressure of the main network is 0.65 MPa.

[0148] Compared with example 2, the breaking strength of the polyester FDY fiber in comparative example 8 is significantly reduced, because the air pressure of the main network is too high, which is easy to blow all the monofilament B to break, resulting in reduced breaking strength.

[0149] A method for preparing a polyester composite fiber, and the difference between example 2 is only that the sound insulation polyester FDY fiber prepared in example 2 is replaced with the polyester FDY fiber prepared in the present comparative example.

[0150] The sound absorption coefficient a of the fabric finally prepared from the polyester composite fiber is 0.19.

[0151] Compared with example 2, the sound absorption coefficient a of the fabric prepared from the polyester composite fiber in comparative example 8 is significantly reduced, because the air pressure of the main network in comparative example 8 is too high, which causes excessive breaking of monofilament B, affecting the strength of the polyester FDY fiber, resulting in easy breaking of monofilament during subsequent compounding with polyester POY fiber, which will result in poor structure stability of the composite fiber and affect the sound absorption effect.

[0152] Comparative example 9

[0153] A method for preparing a polyester composite fiber, and the difference between example 2 is only that the temperature of the first hot box is 145 DEG C.

[0154] The sound absorption coefficient a of the fabric finally prepared from the polyester composite fiber is 0.18.

[0155] Compared with example 2, the sound absorption coefficient a of the fabric prepared from the polyester composite fiber in comparative example 9 is significantly reduced, because the temperature of the first hot box in comparative example 9 is too low, which causes insufficient softening of the polyester POY fiber, and more easy breaking of hair during subsequent passage through the false twister, affecting the sound absorption effect of the fabric.

[0156] Example 3

[0157] A preparation method of soundproof polyester FDY fiber, the overall process flow is: melt is extruded by metering pump→spinning assembly spinning→ring blowing air cooling→first oiling→first pre-networking→first godet→first hot roller→second hot roller→third hot roller→fourth hot roller→second godet→second oiling→second pre-networking→main networking→third godet→winding forming;

[0158] The preparation flow of the melt is: slurry configuration→first esterification→second esterification→pre-polycondensation→final polycondensation→polyester melt (intrinsic viscosity 0.625 dL / g); the related process parameters are: slurry liquid level 69%, the mass of PTA in the slurry accounts for 70% of the total mass of PTA and EG; first esterification temperature 269℃, first esterification pressure 100kPa, second esterification temperature 275℃, second esterification pressure 35kPa, pre-polycondensation upper chamber temperature 280℃, pre-polycondensation upper chamber pressure 36kPa, pre-polycondensation lower chamber temperature 283℃, pre-polycondensation lower chamber pressure 2kPa, final polycondensation inlet temperature 281℃, final polycondensation outlet temperature 287℃, final polycondensation vacuum degree 200Pa;

[0159] In the spinning assembly, the diameter of the spinneret plate is 96mm; the spinneret holes on the spinneret plate are divided into two types, both of which are five-leaf shapes, the five-leaf shape is composed of a circle and 5 long leaves connected with the circle and distributed in a radial manner, the diameter of the circle is 0.24mm, and the included angle between adjacent two leaves in the five-leaf shape is 72°; the leaf length of the first type of spinneret hole is 0.4mm, and the leaf width is 0.055mm; the leaf length of the second type of spinneret hole is 0.4mm, and the leaf width is 0.03mm; the centers of all the spinneret holes are distributed in concentric circles on the spinneret plate, and there are 4 circles, the spinneret holes on each circle are uniformly distributed, the first circle appearing from the inside to the outside is recorded as the 1st circle, the diameter of the 1st circle is 36mm, there are 14 second type of spinneret holes distributed on the 1st circle, the diameter of the 2nd circle is 50mm, there are 18 second type of spinneret holes distributed on the 2nd circle, the diameter of the 3rd circle is 63mm, there are 30 first type of spinneret holes distributed on the 3rd circle, the diameter of the 4th circle is 76mm, and there are 34 first type of spinneret holes distributed on the 4th circle;

[0160] In the spinning assembly, 160g of metal sand with a mesh size of 50-70 is used as filtering sand; the spinning temperature is 289℃;

[0161] The cooling air pressure of the ring blowing air cooling is 35Pa, the length of the cooling air cylinder is 48cm, and the height of the slow cooling zone is 55mm;

[0162] The first pre-networking position is located 138cm below the spinneret plate, and the air pressure of the first pre-networking is 0.03MPa;

[0163] The temperature of the first hot roller is 92℃;

[0164] The temperature of the second heat roller is 92℃;

[0165] The speed ratio of the third heat roller to the first heat roller is 2.5;

[0166] The air pressure of the second pre-networking is 0.13MPa;

[0167] The air pressure of the main network is 0.55MPa.

[0168] The soundproof polyester FDY fiber prepared finally has hair on the surface, the length of the hair is 0.9cm, the hair is curved and the radius of the curve is 3.5cm; the breaking strength of the soundproof polyester FDY fiber is 4.14cN / dtex, the breaking elongation is 28.8%, the differential shrinkage is 15.4%, the relative radial differential shape is 35.4%, the oil content is 0.42%, and the hair rate is 95.1%.

[0169] A method for preparing a soundproof polyester composite fiber, polyester POY fiber (the specification is 80dtex / 72f, and the physical indexes are as follows: breaking strength 2.54cN / dtex, breaking elongation 130.2%, CV value of strip unevenness 1.12%, and oil content 0.33%) and the soundproof polyester FDY fiber prepared in the embodiment are parallel and sequentially passed through pre-networking, a first roller, a first heat box, a cooling plate, the polyester POY fiber is passed through a false twister, and then is combined with the soundproof polyester FDY fiber at a second roller, and then is sequentially passed through a network, an auxiliary roller, a second heat box, a third roller, oiling, and winding to form the soundproof polyester composite fiber.

[0170] The polyester POY fiber and the soundproof polyester FDY fiber are both 1 bundle; the temperature of the first heat box is 160℃; the speed of the second roller is 605m / min, the speed ratio of the second roller to the first roller is 1.66, and the ratio of the surface linear speed of the friction disc of the false twister to the speed of the second roller is 1.6; and the temperature of the second heat box is 175℃.

[0171] The soundproof polyester composite fiber prepared finally has a breaking strength of 3.45cN / dtex, a breaking elongation of 15.4%, an oil content of 2.8%, a crimping shrinkage of 15.2%, a crimping stability of 82.2%, and a hair rate of 95.8%; and the sound absorption coefficient a of the fabric prepared from the soundproof polyester composite fiber is 0.39.

[0172] Comparative Example 10

[0173] A method for preparing a polyester composite fiber, and the difference from the embodiment 3 is that the temperature of the first heat box is 165℃.

[0174] The sound absorption coefficient a of the fabric prepared from the polyester composite fiber is 0.19.

[0175] The sound absorption coefficient a of the fabric made of the polyester composite fiber is significantly reduced compared to Example 3, because the first hot box temperature is too high in Comparative Example 10, and the lint of the soundproof polyester FDY fiber is prone to break, which affects the sound absorption effect of the fabric.

[0176] Example 4

[0177] A method for preparing a soundproof polyester FDY fiber, the overall process flow is: melt is extruded through a metering pump → spinning assembly spinning → air ring cooling → first oiling → first pre-networking → first godet → first hot roller → second hot roller → third hot roller → fourth hot roller → second godet → second oiling → second pre-networking → main networking → third godet → winding into a shape;

[0178] The preparation process of the melt is: slurry preparation → first esterification → second esterification → pre-polycondensation → final polycondensation → polyester melt (intrinsic viscosity 0.628 dL / g); the related process parameters are: slurry level 70%, the mass of PTA in the slurry accounts for 71% of the total mass of PTA and EG; first esterification temperature 270℃, first esterification pressure 110kPa, second esterification temperature 277℃, second esterification pressure 38kPa, pre-polycondensation upper chamber temperature 281℃, pre-polycondensation upper chamber pressure 40kPa, pre-polycondensation lower chamber temperature 284℃, pre-polycondensation lower chamber pressure 2.2kPa, final polycondensation inlet temperature 282℃, final polycondensation outlet temperature 288℃, final polycondensation vacuum degree 240Pa;

[0179] In the spinning assembly, the diameter of the spinneret plate is 104mm; the spinneret holes on the spinneret plate are divided into two types, both of which are five-leaf shapes, the five-leaf shape is composed of a circle and 5 long leaves connected with the circle and distributed in a radial manner, the diameter of the circle is 0.23mm, and the included angle between adjacent two leaves in the five-leaf shape is 72°; the leaf length of the first type of spinneret hole is 0.4mm, and the leaf width is 0.055mm; the leaf length of the second type of spinneret hole is 0.4mm, and the leaf width is 0.03mm; the centers of all the spinneret holes are distributed in concentric circles on the spinneret plate, and there are 5 circles, the spinneret holes on each circle are uniformly distributed, the first circle appearing from the inside to the outside is marked as the 1st circle, the diameter of the 1st circle is 29mm, there are 12 second type of spinneret holes on the 1st circle, the diameter of the 2nd circle is 43mm, there are 17 second type of spinneret holes on the 2nd circle, the diameter of the 3rd circle is 57mm, there are 23 second type of spinneret holes on the 3rd circle, the diameter of the 4th circle is 71mm, there are 29 first type of spinneret holes on the 4th circle, the diameter of the 5th circle is 85mm, and there are 35 first type of spinneret holes on the 5th circle;

[0180] In the spinning assembly, 150g of metal sand with a mesh size of 50-70 is used as the filter sand; the spinning temperature is 290℃;

[0181] The cooling air pressure of the ring blowing cooling is 40 Pa, the length of the cooling air cylinder is 50 cm, and the slow cooling zone height is 60 mm;

[0182] The first pre-networking position is located 140 cm below the spinneret, and the air pressure of the first pre-networking is 0.03 MPa;

[0183] The temperature of the first heat roller is 90℃;

[0184] The temperature of the second heat roller is 90℃;

[0185] The speed ratio of the third heat roller to the first heat roller is 2.1;

[0186] The air pressure of the second pre-networking is 0.1 MPa;

[0187] The air pressure of the main network is 0.55 MPa.

[0188] The finally prepared soundproof polyester FDY fiber has a surface distribution of fluff, the length of the fluff is 1 cm, the fluff is curved and the bending radius is 4 cm; the breaking strength of the soundproof polyester FDY fiber is 4.01 cN / dtex, the breaking elongation is 30.3%, the differential shrinkage is 15.9%, the relative radial irregularity is 36.7%, the oil content is 0.4%, and the fluff rate is 96.3%.

[0189] A soundproof polyester composite fiber is prepared by parallelly and sequentially passing polyester POY fiber (specification: 83 dtex / 72 f, physical indexes: breaking strength 2.59 cN / dtex, breaking elongation 130.9%, yarn unevenness CV value 1.14%, oil content 0.34%) and the soundproof polyester FDY fiber prepared in the embodiment through pre-networking, first roller, first heat box, cooling plate, then passing the polyester POY fiber through a false twister, and then twisting the polyester POY fiber and the soundproof polyester FDY fiber at the second roller, and then sequentially passing through a network, an auxiliary roller, a second heat box, a third roller, oiling, and winding to form a soundproof polyester composite fiber.

[0190] The polyester POY fiber and the soundproof polyester FDY fiber are both 1 bundle; the temperature of the first heat box is 155℃; the speed of the second roller is 605 m / min, the speed ratio of the second roller to the first roller is 1.66, the ratio of the surface linear speed of the friction disc of the false twister to the speed of the second roller is 1.62; and the temperature of the second heat box is 178℃.

[0191] The soundproof polyester composite fiber prepared finally has a breaking strength of 3.32 cN / dtex, an elongation at break of 15.7%, an oil content of 2.8%, a crimp shrinkage of 14.8%, a crimp stability of 79.4%, and a hairiness rate of 96.4%; the sound absorption coefficient a of the fabric prepared from the soundproof polyester composite fiber is 0.49.

[0192] Comparative Example 11

[0193] A method for preparing a polyester FDY fiber, and the difference from Example 4 is only that the diameter of the spinneret is 70 mm; the diameter of the first circle is 22 mm, the diameter of the second circle is 30 mm, the diameter of the third circle is 38 mm, the diameter of the fourth circle is 46 mm, and the diameter of the fifth circle is 54 mm.

[0194] A method for preparing a polyester composite fiber, and the difference from Example 4 is only that the soundproof polyester FDY fiber prepared in Example 4 is replaced with the polyester FDY fiber prepared in the present comparative example.

[0195] The sound absorption coefficient a of the fabric prepared finally from the polyester composite fiber is 0.19.

[0196] Compared with Example 4, the sound absorption coefficient a of the fabric prepared from the polyester composite fiber in Comparative Example 11 is obviously reduced, because the diameter of the spinneret in Comparative Example 11 is too low, which causes the heat dissipation speed of the plate surface to be slow, the plate surface temperature to be relatively high, the cooling speed to be slow, and the relative radial anisotropy to be reduced. When passing through the main network, the filaments B are difficult to form hair, which affects the sound absorption effect of the fabric.

[0197] Example 5

[0198] A method for preparing a soundproof polyester FDY fiber, and the difference from Example 4 is only that the distribution of all the spinning holes on the spinneret is as shown in Figure 4 Each rhombus in the figure is completely the same, and the side length of the rhombus is 7.8 mm, and the minimum internal angle of the rhombus is 30°.

[0199] The soundproof polyester FDY fiber prepared finally has hair on the surface, the length of the hair is 0.8 cm, the hair is curved and the radius of curvature is 3.7 cm; the breaking strength of the soundproof polyester FDY fiber is 3.89 cN / dtex, the elongation at break is 29.7%, the differential shrinkage is 15.2%, the relative radial anisotropy is 29.4%, the oil content is 0.39%, and the hairiness rate is 91.5%.

[0200] A soundproof polyester composite fiber is prepared by the following steps: polyester POY fiber (specification: 88 dtex / 72 f, physical indexes: breaking strength 2.67 cN / dtex, elongation at break 131.0%, yarn unevenness CV value 1.09%, oil content 0.31%) and the soundproof polyester FDY fiber prepared in the embodiment are parallelly and sequentially passed through a pre-network, a first roller, a first heat box, a cooling plate, the polyester POY fiber is passed through a false twister, and then the soundproof polyester FDY fiber is twisted with the polyester POY fiber at a second roller, and then sequentially passed through a network, an auxiliary roller, a second heat box, a third roller, oiling, and winding to form the soundproof polyester composite fiber.

[0201] The polyester POY fiber and the soundproof polyester FDY fiber are both 1 bundle; the temperature of the first heat box is 160℃; the speed of the second roller is 610 m / min, the speed ratio of the second roller to the first roller is 1.67, the ratio of the surface linear speed of the friction disc of the false twister to the speed of the second roller is 1.64; and the temperature of the second heat box is 182℃.

[0202] The soundproof polyester composite fiber finally prepared has a breaking strength of 3.39 cN / dtex, an elongation at break of 14.6%, an oil content of 2.8%, a crimp shrinkage of 14.3%, a crimp stability of 78.6%, and a hairiness rate of 92.9%; and the sound absorption coefficient a of the fabric prepared from the soundproof polyester composite fiber is 0.23.

[0203] Example 6

[0204] A soundproof polyester FDY fiber is prepared by the following steps: the difference from the embodiment 4 is that the mesh number of the metal sand is 70-90.

[0205] The soundproof polyester FDY fiber finally prepared has hair on the surface, the length of the hair is 1.0 cm, the hair is curved and the radius of the curve is 3.9 cm; the soundproof polyester FDY fiber has a breaking strength of 4.07 cN / dtex, an elongation at break of 30.1%, a differential shrinkage of 15.8%, a relative radial differential shape of 24.7%, an oil content of 0.4%, and a hairiness rate of 93.1%.

[0206] A soundproof polyester composite fiber is prepared by the following steps: polyester POY fiber (83 dtex / 72 f, physical indexes: breaking strength 2.59 cN / dtex, elongation at break 130.9%, unevenness CV value 1.14%, oil content 0.34%) and the soundproof polyester FDY fiber prepared in the embodiment are parallelly and sequentially passed through a pre-network, a first roller, a first heat box, a cooling plate, then the polyester POY fiber is passed through a false twister, and the soundproof polyester FDY fiber is twisted with the polyester POY fiber at a second roller, and then the soundproof polyester composite fiber is formed by sequentially passing through a network, an auxiliary roller, a second heat box, a third roller, oiling and winding.

[0207] The polyester POY fiber and the soundproof polyester FDY fiber are both 1 bundle; the temperature of the first heat box is 157℃; the speed of the second roller is 605 m / min, the speed ratio of the second roller to the first roller is 1.66, the ratio of the surface linear speed of the friction disc of the false twister to the speed of the second roller is 1.64; and the temperature of the second heat box is 185℃.

[0208] The soundproof polyester composite fiber has a breaking strength of 3.34 cN / dtex, an elongation at break of 15.9%, an oil content of 2.9%, a crimping shrinkage of 15.7%, a crimping stability of 82%, and a hairiness rate of 93.7%; and the sound absorption coefficient a of the fabric prepared from the soundproof polyester composite fiber is 0.27.

[0209] Example 7

[0210] A soundproof polyester FDY fiber is prepared by the following steps: the difference between the method and that of Example 4 is that the spinning temperature is 295℃.

[0211] The soundproof polyester FDY fiber has hair on the surface, the length of the hair is 0.9 cm, the hair is curved and the radius of the curve is 3.9 cm; the soundproof polyester FDY fiber has a breaking strength of 4.01 cN / dtex, an elongation at break of 30.5%, an uneven shrinkage of 15.8%, a relative radial anisotropy of 25.4%, an oil content of 0.4%, and a hairiness rate of 91.7%.

[0212] A soundproof polyester composite fiber is prepared by the following steps: polyester POY fiber (83 dtex / 72 f, physical indexes: breaking strength 2.59 cN / dtex, elongation at break 130.9%, unevenness CV value 1.14%, oil content 0.34%) and the soundproof polyester FDY fiber prepared in the embodiment are parallelly and sequentially passed through a pre-network, a first roller, a first heat box, a cooling plate, then the polyester POY fiber is passed through a false twister, and the soundproof polyester FDY fiber is twisted with the polyester POY fiber at a second roller, and then the soundproof polyester composite fiber is formed by sequentially passing through a network, an auxiliary roller, a second heat box, a third roller, oiling and winding.

[0213] The polyester POY fiber and the soundproof polyester FDY fiber are both 1 bundle; the temperature of the first hot box is 154℃; the speed of the second roller is 605m / min, the speed ratio of the second roller to the first roller is 1.66, the ratio of the surface linear speed of the friction disc of the false twister to the speed of the second roller is 1.6; the temperature of the second hot box is 180℃.

[0214] The soundproof polyester composite fiber finally prepared has a breaking strength of 3.37cN / dtex, an elongation at break of 15.2%, an oil content of 2.8%, a crimp shrinkage of 15.4%, a crimp stability of 81.9%, and a hairiness rate of 91.6%; the sound absorption coefficient a of the fabric prepared from the soundproof polyester composite fiber is 0.27.

[0215] Example 8

[0216] A method for preparing a soundproof polyester FDY fiber, and the difference from Example 4 is that the cooling air pressure of the ring blowing air cooling is 45Pa.

[0217] The soundproof polyester FDY fiber finally prepared has hair on the surface, the length of the hair is 1.0cm, the hair is curved and the radius of the curvature is 3.9cm; the soundproof polyester FDY fiber has a breaking strength of 4.03cN / dtex, an elongation at break of 29.8%, an unequal shrinkage of 12.4%, a relative radial anisotropy of 38.4%, an oil content of 0.40%, and a hairiness rate of 94.8%.

[0218] A method for preparing a soundproof polyester composite fiber, polyester POY fiber (with a specification of 80dtex / 72f, and physical indexes of a breaking strength of 2.54cN / dtex, an elongation at break of 130.2%, a yarn unevenness CV value of 1.12%, and an oil content of 0.33%) and the soundproof polyester FDY fiber prepared in the present example are parallel and sequentially passed through a pre-network, a first roller, a first hot box, a cooling plate, the polyester POY fiber is passed through a false twister, and then the soundproof polyester FDY fiber is combined with the polyester POY fiber at a second roller, and then sequentially passed through a network, an auxiliary roller, a second hot box, a third roller, oiling, and winding to form the soundproof polyester composite fiber.

[0219] The polyester POY fiber and the soundproof polyester FDY fiber are both 1 bundle; the temperature of the first hot box is 155℃; the speed of the second roller is 620m / min, the speed ratio of the second roller to the first roller is 1.65, the ratio of the surface linear speed of the friction disc of the false twister to the speed of the second roller is 1.64; the temperature of the second hot box is 182℃.

[0220] The soundproof polyester composite fiber finally prepared has a breaking strength of 3.39 cN / dtex, an elongation at break of 15.7%, an oil content of 3.2%, a crimp shrinkage of 14.6%, a crimp stability of 80.3%, and a hairiness rate of 94.1%; the sound absorption coefficient a of the fabric prepared from the soundproof polyester composite fiber is 0.31.

[0221] Example 9

[0222] The soundproof polyester FDY fiber is prepared by the method of the example 4, except that the length of the cooling air cylinder of the ring blowing air cooling is 52 cm.

[0223] The soundproof polyester FDY fiber finally prepared has a hairiness on the surface, the length of the hairiness is 1.0 cm, the hairiness is curved and the radius of the curve is 3.9 cm; the soundproof polyester FDY fiber has a breaking strength of 4.06 cN / dtex, an elongation at break of 29.9%, an unequal shrinkage of 13.7%, a relative radial anisotropy of 36.8%, an oil content of 0.40%, and a hairiness rate of 93.1%.

[0224] The soundproof polyester composite fiber is prepared by the method of the example 4, except that the polyester POY fiber (the specification is 80 dtex / 72 f, and the physical indexes are a breaking strength of 2.54 cN / dtex, an elongation at break of 130.2%, a CV value of yarn unevenness of 1.12%, and an oil content of 0.33%) and the soundproof polyester FDY fiber prepared in the example are parallel and sequentially passed through a pre-network, a first roller, a first heat box, a cooling plate, the polyester POY fiber is passed through a false twister, and then the polyester POY fiber and the soundproof polyester FDY fiber are plied at a second roller, and then sequentially passed through a network, an auxiliary roller, a second heat box, a third roller, oiling, and winding to form the soundproof polyester composite fiber.

[0225] The polyester POY fiber and the soundproof polyester FDY fiber are both 1 bundle; the temperature of the first heat box is 160 ℃; the speed of the second roller is 620 m / min, the speed ratio of the second roller to the first roller is 1.65, the ratio of the surface linear speed of the friction disc of the false twister to the speed of the second roller is 1.65; and the temperature of the second heat box is 181 ℃.

[0226] The soundproof polyester composite fiber finally prepared has a breaking strength of 3.42 cN / dtex, an elongation at break of 15.6%, an oil content of 2.9%, a crimp shrinkage of 14.3%, a crimp stability of 81.6%, and a hairiness rate of 94.6%; the sound absorption coefficient a of the fabric prepared from the soundproof polyester composite fiber is 0.26.

[0227] Example 10

[0228] A preparation method of soundproof polyester FDY fiber, and the difference between example 4 is only that the slow cooling area height of the circular blowing air cooling is 65mm.

[0229] The final soundproof polyester FDY fiber has hair on the surface, the length of the hair is 1.0cm, the hair is curved and the bending radius is 3.9cm; the breaking strength of the soundproof polyester FDY fiber is 4.06cN / dtex, the breaking elongation is 29.9%, the differential shrinkage is 15.1%, the relative radial heteromorphy is 31.2%, the oil content is 0.40%, and the hair rate is 93.7%.

[0230] A preparation method of soundproof polyester composite fiber, polyester POY fiber (specification is 88dtex / 72f, and the physical indexes are: breaking strength 2.67cN / dtex, breaking elongation 131.0%, strip unevenness CV value 1.09%, and oil content 0.31%) and the soundproof polyester FDY fiber prepared in the embodiment are parallel and sequentially passed through pre-networking, a first roller, a first heat box, a cooling plate, the polyester POY fiber is passed through a false twister, and then is combined with the soundproof polyester FDY fiber at a second roller, and then is sequentially passed through a network, an auxiliary roller, a second heat box, a third roller, oiling, and winding to form the soundproof polyester composite fiber;

[0231] The polyester POY fiber and the soundproof polyester FDY fiber are both 1 bundle; the temperature of the first heat box is 158℃; the speed of the second roller is 605m / min, the speed ratio of the second roller to the first roller is 1.67, the ratio of the surface linear speed of the friction disc of the false twister to the speed of the second roller is 1.62; and the temperature of the second heat box is 183℃.

[0232] The final soundproof polyester composite fiber has a breaking strength of 3.39cN / dtex, a breaking elongation of 14.3%, an oil content of 3%, a crimping shrinkage of 15%, a crimping stability of 82.5%, and a hair rate of 94.7%; and the sound absorption coefficient a of the fabric prepared from the soundproof polyester composite fiber is 0.25.

[0233] Example 11

[0234] A preparation method of soundproof polyester FDY fiber, and the difference between example 4 is only that the speed ratio of the third roller to the first roller is 2.0.

[0235] The final soundproof polyester FDY fiber has hair on the surface, the length of the hair is 1.0cm, the hair is curved and the bending radius is 3.9cm; the breaking strength of the soundproof polyester FDY fiber is 3.84cN / dtex, the breaking elongation is 32.7%, the differential shrinkage is 15.6%, the relative radial heteromorphy is 36.1%, the oil content is 0.40%, and the hair rate is 93.3%.

[0236] A method for preparing a soundproof polyester composite fiber, polyester POY fibers (with a specification of 88 dtex / 72 f, and physical indexes of breaking strength 2.67 cN / dtex, breaking elongation 131.0%, slub CV value 1.09%, and oil content 0.31%) and soundproof polyester FDY fibers prepared in the present embodiment are sequentially passed through a pre-network, a first roller, a first heat box, a cooling plate in parallel, the polyester POY fibers are passed through a false twister, and then the soundproof polyester FDY fibers are twisted with the polyester POY fibers at a second roller, and then sequentially passed through a network, an auxiliary roller, a second heat box, a third roller, oiling, and winding to form a soundproof polyester composite fiber;

[0237] wherein the polyester POY fibers and the soundproof polyester FDY fibers are each 1 bundle; the temperature of the first heat box is 157°C; the speed of the second roller is 610 m / min, the speed ratio of the second roller to the first roller is 1.68, the ratio of the surface linear speed of the friction disc of the false twister to the speed of the second roller is 1.63; and the temperature of the second heat box is 180°C.

[0238] The soundproof polyester composite fiber finally prepared has a breaking strength of 3.6 cN / dtex, a breaking elongation of 14.3%, an oil content of 2.8%, a crimp shrinkage of 14.8%, a crimp stability of 80.4%, and a hairiness rate of 92.1%; and a fabric prepared from the soundproof polyester composite fiber has a sound absorption coefficient a of 0.22.

Claims

1. A method for preparing sound-insulating polyester composite fiber, characterized in that, The polyester POY fiber and the soundproof polyester FDY fiber are sequentially arranged in parallel through a pre-networking, a first roller, a first heat box, a cooling plate, the polyester POY fiber is arranged through a false twister, and the polyester POY fiber and the soundproof polyester FDY fiber are plied at a second roller, and then sequentially arranged through a network, an auxiliary roller, a second heat box, a third roller, oiling and winding to form a soundproof polyester composite fiber. The preparation method of the soundproof polyester FDY fiber comprises a spinning assembly spinning process, a circular blowing air cooling process, a stretching process, a setting process and a main network process, in the spinning assembly, the number of the spinning holes on the spinneret plate is 96-144, and the spinning holes are divided into two types. Both the two types of the spinning holes are five-leaf-shaped, the five-leaf-shaped is composed of a circle and five long leaves connected with the circle and distributed in a radial manner, the diameter of the circle is 0.23±0.01mm, and the included angle between two adjacent leaves is 72°. The length of the leaf of the first type of the spinning hole is 0.4mm, and the width of the leaf is 0.055mm; the length of the leaf of the second type of the spinning hole is 0.4mm, and the width of the leaf is 0.03mm. The number ratio of the first type of the spinning hole to the second type of the spinning hole is 1-2:

1. The diameter of the spinneret plate is 95-105mm. The stretching is completed through a first heat roller, a second heat roller and a third heat roller, and the temperature of the first heat roller and the second heat roller is 90-94℃. The setting is completed through the third heat roller and a fourth heat roller. The air pressure of the main network is 0.55-0.6MPa. The temperature of the first heat box is 150-160℃.

2. The method for preparing a sound-insulating polyester composite fiber according to claim 1, characterized in that, The speed of the second roller is 600-620m / min.

3. The method for preparing a sound-insulating polyester composite fiber according to claim 1, characterized in that, The speed ratio of the second roller to the first roller is 1.65-1.68, and the ratio of the surface linear speed of the friction disc of the false twister to the speed of the second roller is 1.60-1.

65.

4. The method for preparing a sound-insulating polyester composite fiber according to claim 1, characterized in that, The temperature of the second heat box is 175-185℃.

5. The method for preparing a sound-insulating polyester composite fiber according to claim 1, characterized in that, All the spinning holes are arranged in a concentric circle on the spinneret plate, the first type of the spinning hole is arranged in the outer circle of the spinneret plate, and the second type of the spinning hole is arranged in the inner circle of the spinneret plate.

6. The method for preparing a sound-insulating polyester composite fiber according to claim 1, characterized in that, In the spinning assembly, 150-180g of metal sand with a mesh of 50-70 is used for filtering sand, and the spinning temperature is 286-290℃.

7. The method for preparing a sound-insulating polyester composite fiber according to claim 1, characterized in that, The cooling air pressure of the circular blowing air cooling is 35-40Pa, the length of the cooling air cylinder is 48-50cm, and the height of the slow cooling area is 55-60mm.

8. The method for preparing a sound-insulating polyester composite fiber according to claim 1, characterized in that, The speed ratio of the third heat roller to the first heat roller is 2.0-2.

5.

9. The method for preparing a sound-insulating polyester composite fiber according to claim 1, characterized in that, The overall process flow is: melt extrusion through a metering pump→spinning assembly spinning→circular blowing air cooling→first oiling→first pre-networking→first godet roller→first heat roller→second heat roller→third heat roller→fourth heat roller→second godet roller→second oiling→second pre-networking→main network→third godet roller→winding forming; the position of the first pre-networking is 130-140cm below the spinneret plate, the air pressure of the first pre-networking is 0.03-0.04MPa, and the air pressure of the second pre-networking is 0.1-0.15MPa.

10. The soundproofing polyester composite fiber prepared by the method according to any one of claims 1 to 9, characterized in that, The breaking strength of the soundproof polyester composite fiber is ≥3.25cN / dtex, the breaking elongation is 14.1-15.9%, the oil content is 2.8-3.2%, the crimping shrinkage is 14.3-15.7%, the crimping stability is ≥78.6%, and the hairiness rate is ≥91.6%. The sound absorption coefficient a of the fabric made of the soundproof polyester composite fiber is ≥0.

22. The sound absorption coefficient a of the fabric made of the soundproof polyester composite fiber is ≥0.22.

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