A kind of thick-denier surface micro-porous hollow bicomponent fiber and its preparation method

Abstract

The present invention discloses a thick-denier surface micro-porous hollow bicomponent fiber and a preparation method thereof. The thick-denier surface micro-porous hollow bicomponent fiber comprises an inner layer and an outer layer. The thick-denier surface micro-porous hollow bicomponent fiber prepared by the present invention overcomes the problem of poor hygroscopicity of conventional polyester. In addition, it also overcomes the problem that conventional polyester fabrics have poor adsorption of functional auxiliaries, resulting in poor wash resistance after fabric functional finishing. At the same time, it also has lightweight heat preservation performance. Under the combined action of ultra-high molecular weight polyethylene powder, linear high-density polyethylene and linear low-density polyethylene, the fabric has good mechanical properties such as breaking strength and good wearing performance. It can be applied to clothing such as overcoats in autumn and winter, and can develop lightweight heat-preserving fabrics, having great market application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of polyester fibers, with a classification number of D01F6 / 84. Specifically, it relates to a thick-denier surface micro-porous hollow bicomponent fiber. Background Art

[0002] Polyester (polyester fiber) is an important variety of synthetic fibers. It is a synthetic fiber obtained by spinning polyester formed by the polycondensation of organic dibasic acids and diols, and belongs to high-molecular compounds. However, conventional polyester fibers on the market currently have poor hygroscopicity and a smooth surface. During the subsequent functional finishing process, they have poor adsorption of functional additives, and the functional effects have poor washability. After 5 washes, the functionality of the fibers decreases by more than 80%. In addition, in the prior art, polyester fibers have the problem of poor warmth retention. Although most scientists have made great efforts to achieve the warmth retention of hollow polyester fibers, there is a new problem. Although the warmth retention has been improved to a certain extent, there are deficiencies in aspects such as hygroscopicity and tensile strength, making it difficult to be used in the clothing field.

[0003] In order to solve the above problems, Chinese Patent CN113279075B discloses a manufacturing process for micro-fine denier PE and PET bicomponent composite short fibers, which improves the tensile properties and thermal stability of the fibers, but it does not solve the problems of poor hygroscopicity and warmth retention of polyester fibers.

[0004] Chinese Patent CN104328553B discloses a preparation method for a warmth retention and comfort modified polyester composite fiber. The prepared polyester fiber has good warmth retention and strong hygroscopicity, but its breaking strength is only 2.82 cN / dtex, which still needs to be enhanced, and it does not solve the washability problem of polyester fibers. Summary of the Invention

[0005] In order to solve the above problems, a first aspect of the present invention provides a thick-denier surface micro-porous hollow bicomponent fiber, and the thick-denier surface micro-porous hollow bicomponent fiber includes an inner layer and an outer layer.

[0006] Preferably, the preparation raw materials of the outer layer, by weight, include: 70-90 parts of linear thermoplastic resin, 8-25 parts of water-soluble resin, and 2-10 parts of high-molecular weight dispersant.

[0007] More preferably, the preparation raw materials of the outer layer, by weight, include: 70-90 parts of linear thermoplastic resin, 10-20 parts of water-soluble resin, and 3-7 parts of high-molecular weight dispersant.

[0008] More preferably, the preparation raw materials of the outer layer, by weight, include: 80 parts of linear thermoplastic resin, 15 parts of water-soluble resin, and 5 parts of high-molecular weight dispersant.

[0009] Preferably, the raw materials for preparing the inner layer include, by weight: 50-80 parts of high molecular weight polymer, 15-35 parts of linear high density polymer, 5-20 parts of linear low density polymer, 2-10 parts of lubricant, and 0.5-5 parts of nano oxide.

[0010] Further preferably, the raw materials for preparing the inner layer include, by weight: 60-80 parts of high molecular weight polymer, 15-30 parts of linear high density polymer, 5-15 parts of linear low density polymer, 5-8 parts of lubricant, and 1-2 parts of nano oxide.

[0011] Further preferably, the raw materials for preparing the inner layer include, by weight: 75 parts of high molecular weight polymer, 20 parts of linear high density polymer, 10 parts of linear low density polymer, 5 parts of lubricant, and 1 part of nano oxide.

[0012] Further preferably, the high molecular weight polymer is ultra-high molecular weight polyethylene powder, the linear high density polymer is linear high density polyethylene, and the linear low density polymer is linear low density polyethylene.

[0013] Preferably, the mass ratio of the linear thermoplastic resin to the water-soluble resin is (70-90):(10-20).

[0014] More preferably, the mass ratio of the linear thermoplastic resin to the water-soluble resin is (75-90):(10-20).

[0015] Further preferably, the mass ratio of the linear thermoplastic resin to the water-soluble resin is 80:15.

[0016] Further preferably, the linear thermoplastic resin includes at least one of polyester, polyoxymethylene, polystyrene-acrylonitrile, polycarbonate, polyamide, and polyolefin, and the water-soluble resin includes at least one of water-based cellulose derivatives, water-soluble polyester resins, water-based modified polybutadiene resins, water-based acrylic resins, and water-based polyurethane resins.

[0017] More preferably, the linear thermoplastic resin is polyester, the polyester is polyethylene terephthalate, and the water-soluble resin is a water-soluble polyester resin.

[0018] Preferably, the mass ratio of the high molecular weight polymer, the linear high density polymer and the linear low density polymer is (50-80):(15-35):(5-20).

[0019] Further preferably, the mass ratio of the high molecular weight polymer, the linear high density polymer and the linear low density polymer is (60-80):(15-30):(5-15).

[0020] More preferably, the mass ratio among the high molecular weight polymer, linear high density polymer and linear low density polymer is 75:20:10.

[0021] More preferably, the high molecular weight polymer is ultra-high molecular weight polyethylene powder, the linear high density polymer is linear high density polyethylene, and the linear low density polymer is linear low density polyethylene.

[0022] Preferably, the mass ratio between the high molecular weight dispersant and the nano-oxide is (2-8):(0.5-2).

[0023] More preferably, the mass ratio between the high molecular weight dispersant and the nano-oxide is (5-8):(1-2).

[0024] More preferably, the mass ratio of the high molecular weight dispersant to the nano-oxide is 5:1.

[0025] Preferably, the high molecular weight dispersant includes at least one of acrylic block copolymer, modified polyurethane polymer, modified polyacrylate, polyorganic carboxylate ammonium salt, and modified high molecular polyester polymer dispersant.

[0026] More preferably, the high molecular weight dispersant is a modified high molecular polyester polymer dispersant.

[0027] Preferably, the lubricant includes at least one of polyethylene oxide wax, polyethylene wax, polypropylene wax, lignite wax and amide wax.

[0028] More preferably, the lubricant is polyethylene oxide wax with a density of 0.5-1.5 g / cm 3 .

[0029] More preferably, the lubricant is polyethylene oxide wax with a density of 0.98 g / cm 3 .

[0030] Preferably, the nano-oxide includes at least one of nano-silica, titanium dioxide, zinc oxide, aluminum oxide, zirconium oxide and cerium oxide.

[0031] More preferably, the nano-oxide is nano-silica with an average particle size of 5-50 nm.

[0032] More preferably, the nano-oxide is nano-silica with an average particle size of 10-20 nm.

[0033] More preferably, the nano-oxide is nano-silica with an average particle size of 12 nm.

[0034] The applicant has found that when the mass ratio of polyethylene terephthalate to water-soluble polyester resin is (70 - 90):(10 - 20), the moisture absorption performance and warmth retention performance of the fiber are improved. It is speculated that: within this mass ratio, the polyester and the water-soluble polyester resin, under the action of the modified high-molecular polyester polymer dispersant, promote the compatibility of the two, the crystallinity of the melt is relatively high, it is not easily stretched and deformed, and an appropriate porosity is obtained, improving the moisture absorption performance and avoiding the problem of reduced warmth retention performance due to a relatively high porosity; The applicant unexpectedly found that when nano-silica is added to the inner layer melt and the particle size is 10 - 20 nm, and the mass ratio of the dispersant to nano-silica is defined as (5 - 8):(1 - 2), the warmth retention performance and the washability are further improved. It is speculated that: the dispersant enhances the binding force between nano-silica and the water-soluble resin, the dispersibility of nano-silica is better, the function of the fiber to absorb infrared rays is improved, and thus the warmth retention performance is improved, so that after the fiber fabric is washed 50 times, the moisture absorption performance is still very good.

[0035] On this basis, the applicant defines the mass ratio of ultra-high molecular weight polyethylene powder, linear high density polyethylene, and linear low density polyethylene as (60 - 80):(15 - 30):(5 - 15), improving the tensile strength of the fiber. It is speculated that: the molecular weight of the ultra-high molecular weight polyethylene powder is relatively high and its processing performance is poor. Adding a certain amount of linear low density polyethylene can promote the compatibility of the ultra-high molecular weight polyethylene powder and linear high density polyethylene, and thus the processing performance is better, promoting the bonding force between the inner layer and the outer layer, so that the breaking strength of the fiber reaches 5.2 cN / dtex and the elongation at break is as high as 18.5%. However, the washability still needs to be enhanced. The applicant adds high density oxidized polyethylene wax and nano-silica. The high density oxidized polyethylene wax is partially compatible with polyethylene substances, weakening the intermolecular interaction force, making the flow performance of the system melt better, ensuring the mechanical strength of the fiber. At the same time, nano-silica has a certain affinity with the water-soluble polyester, promoting the combination of the inner layer and the outer layer, so that after the fiber fabric is washed 50 times, the moisture absorption performance is still very good.

[0036] The second aspect of the present invention provides a thick-denier surface micro-porous hollow bicomponent fiber, and the specific steps are as follows:

[0037] S1: Mix linear thermoplastic resin, water-soluble resin, and high molecular weight dispersant by weight, and melt at 230 - 295 °C to obtain an outer layer melt.

[0038] S2: Mix high molecular weight polymer, linear high density polymer, linear low density polymer, lubricant, and nano-oxide by weight, and melt and extrude at 250 - 300 °C to obtain an inner layer melt.

[0039] S3: Feed the inner melt and the outer melt into the composite spinning box through the melt channels. The composite spinning box contains metering pumps. The rotational speed of the metering pump for the inner melt is 50 - 90 HZ, and the rotational speed of the metering pump for the outer melt is 60 - 100 HZ. The nascent fibers are obtained after being ejected through the spinneret holes.

[0040] S4: Perform primary drawing and secondary drawing on the nascent fibers under the condition of a temperature of 120 - 150 °C, with a drawing ratio of 1 - 2 times, and then obtain semi-finished products.

[0041] S5: Weave the semi-finished products into fabrics, and then perform a bleaching and degreasing process. Under the conditions of a caustic soda concentration of 4 - 10 g / L, hydrogen peroxide of 10 - 15 g / L, a temperature of 90 - 98 °C, and a time of 20 - 30 min, a super high molecular weight polyethylene fiber fabric with micro-porous surfaces is prepared.

[0042] Further preferably, the specific step of ejecting through the spinneret holes in step S3 is that the outer melt is extruded through a single-screw extruder and ejected from the built-in small-sized spinneret holes. At the same time, the outer melt is ejected from the large-sized spinneret holes through the single-screw extruder, cross-linked, and wound to form nascent fibers.

[0043] Beneficial effects: The thick-denier surface micro-porous hollow bicomponent fibers prepared by the present invention overcome the problem of poor moisture absorption of conventional polyesters. In addition, during the later functional finishing process, it also overcomes the problem that conventional polyester fabrics have poor adsorption of functional additives, resulting in poor wash-fastness performance of the fabrics after functional finishing. At the same time, it also has the performance of light weight and warmth retention. Under the combined action of super high molecular weight polyethylene powder, linear high-density polyethylene, and linear low-density polyethylene, the fabric has good mechanical properties such as breaking strength. In addition, the fabric has good wearing performance and can be applied to clothing such as coats in autumn and winter, developing light-weight and warm-keeping fabrics, which has great market application prospects. Description of the Drawings

[0044] Figure 1 : Schematic diagram of the structure of a special spinneret hole.

[0045] The marks on the figure are respectively: 1, spinneret plate; 2, spinneret hole; 21, built-in small-sized spinneret hole; 22, large-sized spinneret hole; 23, perforated sphere. Examples

[0046] Example 1

[0047] A kind of thick-denier surface micro-porous hollow bicomponent fiber, and the thick-denier surface micro-porous hollow bicomponent fiber includes an inner layer and an outer layer.

[0048] The raw materials for preparing the outer layer, by weight, include: 80 parts of linear thermoplastic resin, 15 parts of water-soluble resin, and 5 parts of high molecular weight dispersant.

[0049] The raw materials for preparing the inner layer, by weight, include: 75 parts of high molecular weight polymer, 20 parts of linear high density polymer, 10 parts of linear low density polymer, 5 parts of lubricant, and 1 part of nano-oxide.

[0050] The mass ratio of the linear thermoplastic resin to the water-soluble resin is 80:15.

[0051] The linear thermoplastic resin is polyethylene terephthalate, purchased from DuPont, USA, with the model number FR530 NC.

[0052] The water-soluble resin is water-soluble polyester resin, purchased from Toyobo, with the model number MD-1245.

[0053] The high molecular weight dispersant is a modified high molecular polyester polymer dispersant, purchased from Nanhiong Santuo Chemical Industry Co., Ltd., with the product number STA-1240.

[0054] The mass ratio among the high molecular weight polymer, the linear high density polymer, and the linear low density polymer is 75:20:10.

[0055] The high molecular weight polymer is ultra-high molecular weight polyethylene powder, with a molecular weight of 5.5 million, purchased from Korea Petrochemical, with the model number UHMWPE U050F.

[0056] The linear high density polymer is linear high density polyethylene, purchased from Dow Chemical, USA, with the model number LLDPE DFD-4960.

[0057] The linear low density polymer is linear low density polyethylene, purchased from Maoming Petrochemical, with the model number HHM5502LW.

[0058] The lubricant is oxidized polyethylene wax, with a density of 0.98 g / cm 3 , purchased from Honeywell, with the model number Titan7410.

[0059] The nano-oxide is nano-silica, with an average particle size of 12 nm, purchased from Evonik, Germany, with the model number A200.

[0060] The mass ratio of the high molecular weight dispersant to the nano-oxide is 5:1.

[0061] A kind of thick-denier surface micro-porous hollow bicomponent fiber, the specific steps are as follows:

[0062] S1: Mix the linear thermoplastic resin, the water-soluble resin, and the high molecular weight dispersant by weight, and melt them at 280 °C to obtain the outer layer melt.

[0063] S2: Mix high molecular weight polymer, linear high density polymer, linear low density polymer, lubricant, and nano-oxide by weight parts, melt them at 300 °C and then extrude to obtain the inner layer melt.

[0064] S3: Feed the inner layer melt and the outer layer melt into the composite spinning box through the melt channels. The composite spinning box contains metering pumps. The rotational speed of the metering pump for the inner layer melt is 70 HZ, and the rotational speed of the metering pump for the outer layer melt is 80 HZ. The primary fiber is obtained by spraying through the spinneret holes.

[0065] S4: Perform the first stage of drawing on the primary fiber at a temperature of 130 °C with a draw ratio of 1 time, and then perform the second stage of drawing at a temperature of 150 °C with a draw ratio of 2 times to obtain the semi-finished product.

[0066] S5: Post-treat the semi-finished product to obtain...

[0067] Weave the semi-finished product into a fabric, and then perform the bleaching and degreasing process. At a caustic soda concentration of 4 g / L, hydrogen peroxide of 12 g / L, a temperature of 95 °C, and a time of 25 min, a surface micro-porous ultra-high molecular weight polyethylene fiber fabric is prepared.

[0068] The specific steps of spraying through the spinneret holes in step S3 are as follows: The outer layer melt is extruded through a single-screw extruder and sprayed out through an inner small-size spinneret hole. At the same time, the outer layer melt is sprayed out through a large-size spinneret hole of the single-screw extruder, cross-linked, and wound to form the primary fiber.

[0069] Example 2

[0070] A thick denier surface micro-porous hollow bicomponent fiber, the thick denier surface micro-porous hollow bicomponent fiber includes an inner layer and an outer layer.

[0071] The raw materials for preparing the outer layer, by weight parts, include: 75 parts of linear thermoplastic resin, 20 parts of water-soluble resin, and 5 parts of high molecular weight dispersant.

[0072] The raw materials for preparing the inner layer, by weight parts, include: 60 parts of high molecular weight polymer, 20 parts of linear high density polymer, 12 parts of linear low density polymer, 6 parts of lubricant, and 2 parts of nano-oxide.

[0073] The mass ratio of the linear thermoplastic resin to the water-soluble resin is 75:20.

[0074] The linear thermoplastic resin is polyethylene terephthalate, purchased from DuPont in the United States, with the model FR530 NC.

[0075] The water-soluble resin is water-soluble polyester resin, purchased from Toyobo, with the model MD-1245.

[0076] The high molecular weight dispersant is a modified high molecular polyester polymer dispersant, purchased from Nanhxiong Santuo Chemical Industry Co., Ltd., with the product number of STA-1240.

[0077] The mass ratio among the high molecular weight polymer, linear high density polymer and linear low density polymer is 60:20:12.

[0078] The high molecular weight polymer is ultra-high molecular weight polyethylene powder, with a molecular weight of 5.5 million, purchased from Korea Yuhwa, with the model of UHMWPE U050F.

[0079] The linear high density polymer is linear high density polyethylene, purchased from Dow Chemical Company of the United States, with the model of LLDPE DFD-4960.

[0080] The linear low density polymer is linear low density polyethylene, purchased from Maoming Petrochemical, with the model of HHM5502LW.

[0081] The lubricant is polyethylene oxide wax, with a density of 0.98 g / cm 3 , purchased from Honeywell, with the model of Titan7410.

[0082] The nano-oxide is nano-silica, with an average particle size of 12 nm, purchased from Evonik of Germany, with the model of A200.

[0083] The mass ratio between the high molecular weight dispersant and the nano-oxide is 5:2.

[0084] A kind of thick denier surface micro-porous hollow bicomponent fiber, the specific steps are as follows:

[0085] S1: Mix the linear thermoplastic resin, water-soluble resin and high molecular weight dispersant by weight, and melt them at 280 °C to obtain the outer layer melt.

[0086] S2: Mix the high molecular weight polymer, linear high density polymer, linear low density polymer, lubricant and nano-oxide by weight, melt them at 300 °C and then extrude to obtain the inner layer melt.

[0087] S3: Feed the inner layer melt and the outer layer melt into the composite spinning box through the melt channels. The composite spinning box contains metering pumps. The rotation speed of the metering pump for the inner layer melt is 70 HZ, and the rotation speed of the metering pump for the outer layer melt is 80 HZ. The nascent fibers are obtained by spraying through the spinneret holes;

[0088] S4: Perform primary drawing on the nascent fibers at a temperature of 130 °C, with a drawing ratio of 1.5 times to obtain the semi-finished product.

[0089] S5: Perform post-treatment on the semi-finished product to obtain.

[0090] Weave the semi-finished product into a fabric, and then carry out the bleaching and degreasing process. At a caustic soda concentration of 4 g / L, hydrogen peroxide of 12 g / L, a temperature of 95 °C, and a time of 25 min, a super high molecular weight polyethylene fiber fabric with micro-porous surface layer is obtained.

[0091] The specific steps of spraying through the spinneret holes in step S3 are as follows: the outer layer melt is extruded through a single-screw extruder and sprayed out from the built-in small-size spinneret holes. At the same time, the outer layer melt is sprayed out from the large-size spinneret holes through the single-screw extruder, cross-linked, and wound to form a nascent fiber.

[0092] Example 3

[0093] A thick-denier surface micro-porous hollow bicomponent fiber, and the thick-denier surface micro-porous hollow bicomponent fiber includes an inner layer and an outer layer.

[0094] The preparation raw materials of the outer layer, by weight, include: 90 parts of linear thermoplastic resin, 20 parts of water-soluble resin, and 5 parts of high molecular weight dispersant.

[0095] The preparation raw materials of the inner layer, by weight, include: 75 parts of high molecular weight polymer, 20 parts of linear high density polymer, 10 parts of linear low density polymer, 5 parts of lubricant, and 1 part of nano-oxide.

[0096] The mass ratio of the linear thermoplastic resin to the water-soluble resin is 90:20.

[0097] The linear thermoplastic resin is polyethylene terephthalate, purchased from DuPont of the United States, and the model is FR530 NC.

[0098] The water-soluble resin is water-soluble polyester resin, purchased from Toyobo, and the model is MD-1245.

[0099] The high molecular weight dispersant is a modified high molecular polyester polymer dispersant, purchased from Nanhxiong Santuo Chemical Industry Co., Ltd., and the product number is STA-1240.

[0100] The mass ratio among the high molecular weight polymer, the linear high density polymer, and the linear low density polymer is 75:20:10.

[0101] The high molecular weight polymer is super high molecular weight polyethylene powder, with a molecular weight of 5.5 million, purchased from Korea Petrochemical, and the model is UHMWPE U050F.

[0102] The linear high density polymer is linear high density polyethylene, purchased from Dow Chemical of the United States, and the model is LLDPE DFD-4960.

[0103] The linear low-density polymer is linear low-density polyethylene, purchased from Maoming Petrochemical, model HHM5502LW.

[0104] The lubricant is polyethylene wax oxide, with a density of 0.98 g / cm 3 , purchased from Honeywell, model Titan7410.

[0105] The nano-oxide is nano-silica, with an average particle size of 12 nm, purchased from Evonik Industries AG of Germany, model A200.

[0106] The mass ratio of the high molecular weight dispersant to the nano-oxide is 5:1.

[0107] A coarse denier surface micro-porous hollow bicomponent fiber, the specific steps are as follows:

[0108] S1: Mix the linear thermoplastic resin, water-soluble resin, and high molecular weight dispersant by weight, and melt at 280 °C to obtain the outer layer melt.

[0109] S2: Mix the high molecular weight polymer, linear high-density polymer, linear low-density polymer, lubricant, and nano-oxide by weight, melt and extrude at 300 °C to obtain the inner layer melt.

[0110] S3: Feed the inner layer melt and the outer layer melt into the composite spinning box through the melt channels. The composite spinning box contains metering pumps. The rotational speed of the metering pump for the inner layer melt is 70 HZ, and the rotational speed of the metering pump for the outer layer melt is 80 HZ. The nascent fibers are obtained by spraying through the spinneret holes.

[0111] S4: Perform primary drawing on the nascent fibers at a temperature of 130 °C with a draw ratio of 1 time, and then perform secondary drawing at a temperature of 150 °C with a draw ratio of 2 times to obtain the semi-finished product.

[0112] S5: Perform post-treatment on the semi-finished product to obtain.

[0113] Weave the semi-finished product into a fabric, and then perform the bleaching and degreasing process. At a caustic soda concentration of 4 g / L, hydrogen peroxide of 12 g / L, a temperature of 95 °C, and a time of 25 min, a surface micro-porous ultra-high molecular weight polyethylene fiber fabric is prepared.

[0114] The specific steps of spraying through the spinneret holes in step S3 are as follows: The outer layer melt is extruded through a single-screw extruder and sprayed out through an internal small-size spinneret hole. At the same time, the outer layer melt is sprayed out through a large-size spinneret hole of the single-screw extruder, cross-linked, and wound to form nascent fibers.

[0115] Example 4

[0116] A thick-denier surface micro-porous hollow bicomponent fiber, said thick-denier surface micro-porous hollow bicomponent fiber comprising an inner layer and an outer layer.

[0117] The raw materials for preparing the outer layer, by weight, include: 80 parts of linear thermoplastic resin, 15 parts of water-soluble resin, and 5 parts of high molecular weight dispersant.

[0118] The raw materials for preparing the inner layer, by weight, include: 80 parts of high molecular weight polymer, 30 parts of linear high density polymer, 15 parts of linear low density polymer, 5 parts of lubricant, and 1 part of nano-oxide.

[0119] The mass ratio of the linear thermoplastic resin to the water-soluble resin is 80:15.

[0120] The linear thermoplastic resin is polyethylene terephthalate, purchased from DuPont of the United States, model FR530 NC.

[0121] The water-soluble resin is water-soluble polyester resin, purchased from Toyobo, model MD-1245.

[0122] The high molecular weight dispersant is a modified high molecular polyester polymer dispersant, purchased from Nanhiong Santuo Chemical Industry Co., Ltd., product number STA-1240.

[0123] The mass ratio among the high molecular weight polymer, the linear high density polymer, and the linear low density polymer is 75:20:10.

[0124] The high molecular weight polymer is ultra-high molecular weight polyethylene powder, with a molecular weight of 5.5 million, purchased from Korea Petrochemical, model UHMWPE U050F.

[0125] The linear high density polymer is linear high density polyethylene, purchased from Dow of the United States, model LLDPE DFD-4960.

[0126] The linear low density polymer is linear low density polyethylene, purchased from Maoming Petrochemical, model HHM5502LW.

[0127] The lubricant is oxidized polyethylene wax, with a density of 0.98 g / cm 3 , purchased from Honeywell, model Titan7410.

[0128] The nano-oxide is nano-silica, with an average particle size of 12 nm, purchased from Evonik of Germany, model A200.

[0129] The mass ratio of the high molecular weight dispersant to the nano-oxide is 5:1.

[0130] A thick-denier surface micro-porous hollow bicomponent fiber, the specific steps are as follows:

[0131] S1: Mix linear thermoplastic resin, water-soluble resin, and high-molecular-weight dispersant by weight, and melt them at 280 °C to obtain an outer layer melt.

[0132] S2: Mix high-molecular-weight polymer, linear high-density polymer, linear low-density polymer, lubricant, and nano-oxide by weight, melt them at 300 °C and then extrude to obtain an inner layer melt.

[0133] S3: Feed the inner layer melt and the outer layer melt into a composite spinning box through a melt channel. The composite spinning box contains metering pumps. The rotational speed of the metering pump for the inner layer melt is 70 HZ, and the rotational speed of the metering pump for the outer layer melt is 80 HZ. The as-spun fibers are obtained by spraying through spinneret holes.

[0134] S4: Perform primary drawing on the as-spun fibers at a temperature of 130 °C with a draw ratio of 1 time, and then perform secondary drawing at a temperature of 150 °C with a draw ratio of 2 times to obtain semi-finished products.

[0135] S5: Perform post-treatment on the semi-finished products to obtain.

[0136] Weave the semi-finished products into fabrics, and then perform a bleaching and degreasing process. At a caustic soda concentration of 4 g / L, hydrogen peroxide of 12 g / L, a temperature of 95 °C, and a time of 25 min, a surface micro-porous ultra-high molecular weight polyethylene fiber fabric is obtained.

[0137] The specific steps of spraying through the spinneret holes in step S3 are as follows: The outer layer melt is extruded through a single-screw extruder and sprayed out through an inner small-size spinneret hole. At the same time, the outer layer melt is sprayed out through a large-size spinneret hole by a single-screw extruder, cross-linked, and wound to form as-spun fibers.

[0138] Comparative Example 1

[0139] A thick-denier surface micro-porous hollow bicomponent fiber, the thick-denier surface micro-porous hollow bicomponent fiber includes an inner layer and an outer layer.

[0140] The preparation raw materials of the outer layer, by weight, include: 60 parts of linear thermoplastic resin, 30 parts of water-soluble resin, and 5 parts of high-molecular-weight dispersant.

[0141] The preparation raw materials of the inner layer, by weight, include: 75 parts of high-molecular-weight polymer, 20 parts of linear high-density polymer, 10 parts of linear low-density polymer, 5 parts of lubricant, and 1 part of nano-oxide.

[0142] The mass ratio of the linear thermoplastic resin to the water-soluble resin is 60:30.

[0143] The linear thermoplastic resin is polyethylene terephthalate, purchased from DuPont in the United States, with the model number FR530 NC.

[0144] The water-soluble resin is a water-soluble polyester resin, purchased from Toyobo, with the model number MD-1245.

[0145] The high molecular weight dispersant is a modified high molecular polyester polymer dispersant, purchased from Nanhxiong Santuo Chemical Industry Co., Ltd., with the product number STA-1240.

[0146] The mass ratio among the high molecular weight polymer, linear high density polymer, and linear low density polymer is 75:20:10.

[0147] The high molecular weight polymer is ultra-high molecular weight polyethylene powder, with a molecular weight of 5.5 million, purchased from Korea Petrochemical, with the model number UHMWPE U050F.

[0148] The linear high density polymer is linear high density polyethylene, purchased from Dow in the United States, with the model number LLDPE DFD-4960.

[0149] The linear low density polymer is linear low density polyethylene, purchased from Maoming Petrochemical, with the model number HHM5502LW.

[0150] The lubricant is oxidized polyethylene wax, with a density of 0.98 g / cm 3 , purchased from Honeywell, with the model number Titan7410.

[0151] The nano-oxide is nano-silica, with an average particle size of 12 nm, purchased from Evonik in Germany, with the model number A200.

[0152] The mass ratio of the high molecular weight dispersant to the nano-oxide is 5:1.

[0153] A thick-denier surface micro-porous hollow bicomponent fiber, the specific steps are as follows:

[0154] S1: Mix the linear thermoplastic resin, water-soluble resin, and high molecular weight dispersant by weight, and melt them at 280 °C to obtain an outer layer melt.

[0155] S2: Mix the high molecular weight polymer, linear high density polymer, linear low density polymer, lubricant, and nano-oxide by weight, and then melt and extrude them at 300 °C to obtain an inner layer melt.

[0156] S3: Feed the inner layer melt and the outer layer melt into a composite spinning box through a melt channel. The composite spinning box contains metering pumps. The rotation speed of the metering pump for the inner layer melt is 70 HZ, and the rotation speed of the metering pump for the outer layer melt is 80 HZ. The as-spun fiber is obtained by spraying through a spinneret hole;

[0157] S4: Perform primary drawing on the nascent fiber at a temperature of 130 °C with a drawing ratio of 1 time, and then perform secondary drawing at a temperature of 150 °C with a drawing ratio of 2 times to obtain a semi-finished product.

[0158] S5: Perform post-treatment on the semi-finished product to obtain.

[0159] Weave the semi-finished product into a fabric, and then perform a bleaching and degreasing process. At a caustic soda concentration of 4 g / L, hydrogen peroxide of 12 g / L, a temperature of 95 °C, and a time of 25 min, a super high molecular weight polyethylene fiber fabric with micro-porous surfaces is obtained.

[0160] The specific steps of the outer layer melt ejected through the spinneret hole in step S3 are as follows: the outer layer melt is extruded through a single-screw extruder and ejected from an inner small-sized spinneret hole. At the same time, the outer layer melt is ejected from a large-sized spinneret hole through a single-screw extruder, cross-linked, and wound to form nascent fibers.

[0161] Comparative Example 2

[0162] A thick-denier surface micro-porous hollow bicomponent fiber, and the thick-denier surface micro-porous hollow bicomponent fiber includes an inner layer and an outer layer.

[0163] The preparation raw materials of the outer layer, by weight, include: 90 parts of linear thermoplastic resin, 5 parts of water-soluble resin, and 5 parts of high molecular weight dispersant.

[0164] The preparation raw materials of the inner layer, by weight, include: 75 parts of high molecular weight polymer, 20 parts of linear high density polymer, 10 parts of linear low density polymer, 5 parts of lubricant, and 1 part of nano-oxide.

[0165] The mass ratio of the linear thermoplastic resin to the water-soluble resin is 90:5.

[0166] The linear thermoplastic resin is polyethylene terephthalate, purchased from DuPont in the United States, with the model FR530 NC.

[0167] The water-soluble resin is water-soluble polyester resin, purchased from Toyobo, with the model MD-1245.

[0168] The high molecular weight dispersant is a modified high molecular polyester polymer dispersant, purchased from Nanhxiong Santuo Chemical Industry Co., Ltd., with the product number STA-1240.

[0169] The mass ratio among the high molecular weight polymer, the linear high density polymer, and the linear low density polymer is 75:20:10.

[0170] The high molecular weight polymer is ultra-high molecular weight polyethylene powder with a molecular weight of 5.5 million, purchased from Korea Petrochemical, and the model is UHMWPE U050F.

[0171] The linear high-density polymer is linear high-density polyethylene, purchased from Dow Chemical Company, USA, and the model is LLDPE DFD-4960.

[0172] The linear low-density polymer is linear low-density polyethylene, purchased from Maoming Petrochemical, and the model is HHM5502LW.

[0173] The lubricant is polyethylene wax oxide with a density of 0.98 g / cm 3 , purchased from Honeywell, and the model is Titan7410.

[0174] The nano-oxide is nano-silica with an average particle size of 12 nm, purchased from Evonik, Germany, and the model is A200.

[0175] The mass ratio of the high molecular weight dispersant to the nano-oxide is 5:1.

[0176] A kind of thick-denier surface micro-porous hollow bicomponent fiber, the specific steps are as follows:

[0177] S1: Mix linear thermoplastic resin, water-soluble resin, and high molecular weight dispersant by weight, and melt at 280 °C to obtain an outer layer melt.

[0178] S2: Mix high molecular weight polymer, linear high-density polymer, linear low-density polymer, lubricant, and nano-oxide by weight, melt and extrude at 300 °C to obtain an inner layer melt.

[0179] S3: Feed the inner layer melt and the outer layer melt into a composite spinning box through a melt channel. The composite spinning box contains metering pumps. The rotation speed of the metering pump for the inner layer melt is 70 HZ, and the rotation speed of the metering pump for the outer layer melt is 80 HZ. The as-spun fiber is obtained by spraying through a spinneret hole;

[0180] S4: Perform primary drawing on the as-spun fiber at a temperature of 130 °C with a draw ratio of 1 time, and then perform secondary drawing at a temperature of 150 °C with a draw ratio of 2 times to obtain a semi-finished product.

[0181] S5: Post-treat the semi-finished product to obtain.

[0182] Weave the semi-finished product into a fabric, and then perform a bleaching and degreasing process. Under the conditions of a caustic soda concentration of 4 g / L, hydrogen peroxide of 12 g / L, a temperature of 95 °C, and a time of 25 min, a surface micro-porous ultra-high molecular weight polyethylene fiber fabric is prepared.

[0183] The specific steps of the melt ejected through the spinneret holes in step S3 are as follows: the outer layer melt is extruded by a single-screw extruder and ejected through the built-in small-sized spinneret holes. At the same time, the outer layer melt is ejected through the large-sized spinneret holes by the single-screw extruder, intertwined, and wound to form a nascent fiber.

[0184] Comparative Example 3

[0185] A thick-denier surface micro-porous hollow bicomponent fiber, said thick-denier surface micro-porous hollow bicomponent fiber comprising an inner layer and an outer layer.

[0186] The raw materials for preparing the outer layer, by weight, include: 80 parts of linear thermoplastic resin, 15 parts of water-soluble resin, and 8 parts of high molecular weight dispersant.

[0187] The raw materials for preparing the inner layer, by weight, include: 90 parts of high molecular weight polymer, 20 parts of linear high density polymer, 10 parts of linear low density polymer, 20 parts of lubricant, and 5 parts of nano-oxide.

[0188] The mass ratio of the linear thermoplastic resin to the water-soluble resin is 80:15.

[0189] The linear thermoplastic resin is polyethylene terephthalate, purchased from DuPont in the United States, with the model number FR530 NC.

[0190] The water-soluble resin is water-soluble polyester resin, purchased from Toyobo, with the model number MD-1245.

[0191] The high molecular weight dispersant is a modified high molecular polyester polymer dispersant, purchased from Nanhxiong Santuo Chemical Industry Co., Ltd., with the product number STA-1240.

[0192] The mass ratio among the high molecular weight polymer, the linear high density polymer, and the linear low density polymer is 90:20:10.

[0193] The high molecular weight polymer is ultra-high molecular weight polyethylene powder, with a molecular weight of 5.5 million, purchased from Korea Yuhwa, with the model number UHMWPE U050F.

[0194] The linear high density polymer is linear high density polyethylene, purchased from Dow in the United States, with the model number LLDPE DFD-4960.

[0195] The linear low density polymer is linear low density polyethylene, purchased from Maoming Petrochemical, with the model number HHM5502LW.

[0196] The lubricant is oxidized polyethylene wax, with a density of 0.98 g / cm 3 , purchased from Honeywell, with the model number Titan7410.

[0197] The nano-oxide is nano-silica with an average particle size of 12 nm, purchased from Evonik Industries AG in Germany, and the model is A200.

[0198] The mass ratio of the high molecular weight dispersant to the nano-oxide is 8:5.

[0199] A thick denier surface micro-porous hollow bicomponent fiber, and the specific steps are as follows:

[0200] S1: Mix linear thermoplastic resin, water-soluble resin, and high molecular weight dispersant by weight, and melt at 280 °C to obtain an outer layer melt.

[0201] S2: Mix high molecular weight polymer, linear high density polymer, linear low density polymer, lubricant, and nano-oxide by weight, melt and extrude at 300 °C to obtain an inner layer melt.

[0202] S3: Feed the inner layer melt and the outer layer melt into a composite spinning box through a melt channel. The composite spinning box is equipped with metering pumps. The rotational speed of the metering pump for the inner layer melt is 70 HZ, and the rotational speed of the metering pump for the outer layer melt is 80 HZ. The primary fiber is obtained by spraying through a spinneret hole.

[0203] S4: Perform primary drawing on the primary fiber at a temperature of 130 °C with a draw ratio of 1 time, and then perform secondary drawing at a temperature of 150 °C with a draw ratio of 2 times to obtain a semi-finished product.

[0204] S5: Perform post-treatment on the semi-finished product to obtain.

[0205] Weave the semi-finished product into a fabric, and then perform a bleaching and degreasing process. Under the conditions of a caustic soda concentration of 4 g / L, hydrogen peroxide of 12 g / L, a temperature of 95 °C, and a time of 25 min, a surface micro-porous ultra-high molecular weight polyethylene fiber fabric is prepared.

[0206] The specific step of spraying through the spinneret hole in step S3 is that the outer layer melt is extruded through a single screw extruder and sprayed out through an inner small-size spinneret hole. At the same time, the outer layer melt is sprayed out through a large-size spinneret hole of the single screw extruder, cross-linked, and wound to form a primary fiber.

[0207] Comparative Example 4

[0208] A thick denier surface micro-porous hollow bicomponent fiber, and the thick denier surface micro-porous hollow bicomponent fiber includes an inner layer and an outer layer.

[0209] The raw materials for preparing the outer layer, by weight, include: 80 parts of linear thermoplastic resin, 15 parts of water-soluble resin, and 5 parts of high molecular weight dispersant.

[0210] The raw materials for preparing the inner layer, by weight, include: 40 parts of high molecular weight polymer, 30 parts of linear high density polymer, 30 parts of linear low density polymer, 5 parts of lubricant, and 5 parts of nano-oxide.

[0211] The mass ratio of the linear thermoplastic resin to the water-soluble resin is 80:15.

[0212] The linear thermoplastic resin is polyethylene terephthalate, purchased from DuPont, USA, with the model number FR530 NC.

[0213] The water-soluble resin is water-soluble polyester resin, purchased from Toyobo, with the model number MD-1245.

[0214] The high molecular weight dispersant is a modified high molecular polyester polymer dispersant, purchased from Nanhiong Santuo Chemical Industry Co., Ltd., with the product number STA-1240.

[0215] The mass ratio among the high molecular weight polymer, the linear high density polymer, and the linear low density polymer is 40:30:30.

[0216] The high molecular weight polymer is ultra-high molecular weight polyethylene powder, with a molecular weight of 5.5 million, purchased from Korea Petrochemical, with the model number UHMWPE U050F.

[0217] The linear high density polymer is linear high density polyethylene, purchased from Dow Chemical, USA, with the model number LLDPE DFD-4960.

[0218] The linear low density polymer is linear low density polyethylene, purchased from Maoming Petrochemical, with the model number HHM5502LW.

[0219] The lubricant is polyethylene wax oxide, with a density of 0.98 g / cm 3 , purchased from Honeywell, with the model number Titan7410.

[0220] The nano-oxide is nano-silica, with an average particle size of 12 nm, purchased from Evonik, Germany, with the model number A200.

[0221] The mass ratio of the high molecular weight dispersant to the nano-oxide is 5:5.

[0222] A coarse denier surface micro-porous hollow bicomponent fiber, the specific steps are as follows:

[0223] S1: Mix the linear thermoplastic resin, the water-soluble resin, and the high molecular weight dispersant by weight, and melt them at 280 °C to obtain the outer layer melt.

[0224] S2: Mix high molecular weight polymer, linear high density polymer, linear low density polymer, lubricant, and nano-oxide by weight parts, melt them at 300 °C and then extrude to obtain the inner layer melt.

[0225] S3: Feed the inner layer melt and the outer layer melt into the composite spinning box through the melt channels. The composite spinning box contains metering pumps. The rotation speed of the metering pump for the inner layer melt is 70 HZ, and the rotation speed of the metering pump for the outer layer melt is 80 HZ. The primary fiber is obtained by spraying through the spinneret holes.

[0226] S4: Perform primary drawing on the primary fiber at a temperature of 130 °C with a draw ratio of 1 time, and then perform secondary drawing at a temperature of 150 °C with a draw ratio of 2 times to obtain the semi-finished product.

[0227] S5: Post-treat the semi-finished product to obtain...

[0228] Weave the semi-finished product into a fabric, and then perform the bleaching and degreasing process. At a caustic soda concentration of 4 g / L, hydrogen peroxide of 12 g / L, a temperature of 95 °C, and a time of 25 min, a super high molecular weight polyethylene fiber fabric with micropores on the surface is obtained.

[0229] The specific step of spraying through the spinneret holes in step S3 is that the outer layer melt is extruded through a single screw extruder and sprayed out from the built-in small-sized spinneret holes. At the same time, the outer layer melt is sprayed out from the large-sized spinneret holes through the single screw extruder, cross-linked, and wound to form the primary fiber.

[0230] Performance Evaluation

[0231] (1) Fiber porosity measurement method: First, measure the dry weight m1 of the fiber, and then place the fiber in a graduated cylinder filled with xylene solvent until it is completely immersed, so that the xylene solvent fills the internal pores of the fiber, and record the increased volume V of the xylene solvent. After the fiber is taken out, adsorb the residual solvent on the fiber surface with filter paper and weigh the fiber weight m2. The porosity P% of the fiber can be calculated using formula 1. Formula 1 is

[0232] where ρ is the density of the xylene solvent, taking 0.86 g / cm 2

[0233] (2) Tensile strength and elongation at break test: Test the fiber fabrics obtained in Examples 1-4 and Comparative Examples 1-4 according to the test standard GB9997-88, and the test results are shown in Table 1 below.

[0234] (3) Washability test: Wash the fiber fabrics obtained in Comparative Examples 1-3 and Examples 1-4 50 times and then test the moisture absorption performance of the fabrics.

[0235] (4) Moisture absorption performance test: 1. 0.2 ml of pure water is dropped on the fabric, and the diffusion diameter is more than 60 mm within 30 seconds; 2. A cloth sample with a length of 25 cm and a width of 5 cm is suspended vertically above the colored distilled water, and the lower end is vertically inserted into the water by 3 cm. After 30 minutes, the height of the water rising along the cloth sample is measured, and the longitudinal water absorption is more than 18 cm; 3. The test result according to AATCC 79-2000 standard is ≤4 seconds; Meeting the above three conditions is qualified, otherwise it is unqualified.

[0236] Table 1

[0237]

Claims

1. A coarse denier surface micro-porous hollow bicomponent fiber, characterized in that, The coarse denier surface microporous hollow bicomponent fiber comprises an inner layer and an outer layer; The raw materials for preparing the outer layer include, by weight: 70-90 parts of a linear thermoplastic resin, 10-20 parts of a water-soluble polyester resin, and 2-8 parts of a high molecular weight dispersant; The raw materials for preparing the inner layer include, by weight: 50-80 parts of high molecular weight polymer, 15-35 parts of linear high density polymer, 5-20 parts of linear low density polymer, 2-10 parts of lubricant, and 0.5-2 parts of nano oxide; the high molecular weight polymer is ultra-high molecular weight polyethylene powder, the linear high density polymer is linear high density polyethylene, and the linear low density polymer is linear low density polyethylene; The mass ratio of the linear thermoplastic resin to the water-soluble polyester resin is (70-90): (10-20); The mass ratio between the high molecular weight dispersant and the nano oxide is (2-8): (0.5-2); The high molecular weight dispersant is a modified high molecular weight polyester polymer dispersant, and the product number is STA-1240; The nano oxide is nano silicon dioxide; The linear thermoplastic resin is polyethylene terephthalate.

2. The coarse-denier surface micro-porous hollow bicomponent fiber according to claim 1, characterized in that, The lubricant includes at least one of oxidized polyethylene wax, polyethylene wax, polypropylene wax, montan wax and amide wax.

3. The thick-denier surface micro-porous hollow bicomponent fiber according to claim 1, characterized in that, The specific steps are as follows: S1: mixing and melting a linear thermoplastic resin, a water-soluble resin, and a high molecular weight dispersant to obtain an outer layer melt; S2: mixing and melting a high molecular weight polymer, a linear high density polymer, a linear low density polymer, a lubricant, and a nano oxide to obtain an inner layer melt; S3: adding the inner layer melt and the outer layer melt into a composite spinning box to obtain nascent fibers; S4: hot-drawing the spun fibers to obtain semi-finished products; S5: Weaving the semi-finished product into fabric and then post-processing it to obtain ultra-high molecular weight polyethylene fiber fabric with micro-porous surface.

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