Breathable polyester fiber composite fabric and preparation method thereof

Abstract

The invention relates to a breathable polyester fiber composite fabric and a preparation method thereof, and belongs to the technical field of composite fabrics. The fabric is composed of polyester densely-woven base cloth and a polyurethane surface layer on the surface, and the polyurethane surface layer is formed by curing polyurethane surface paste and comprises 42-48 wt% of modified polyurethane, 0.4-0.5 wt% of an emulsifier, 1.1-1.5 wt% of a thickening agent, 0.2-0.3 wt% of a defoaming agent, 1.2-1.5 wt% of a coloring agent, 0.8-1 wt% of color paste and the balance water; the modified polyurethane is prepared by the following steps: carrying out ester exchange on 4-fluorophenylethylamine and diallyl diethyl malonate to obtain an intermediate, carrying out double-bond click addition on mercaptoethanol and the intermediate to obtain a modified monomer, finally carrying out block prepolymerization on the modified monomer, polyether glycol and hexamethylene diisocyanate, and carrying out chain extension by 1, 4-butanediol to form a macromolecular polymer. A large number of water-repellent micro-pores are formed in the coating, so that the coating has good waterproof and air-permeable performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite fabrics, and in particular, relates to a breathable polyester fiber composite fabric and a preparation method thereof. Background Art

[0002] With the development of society and the continuous improvement of the quality of life, traditional textile fabrics are gradually unable to meet people's clothing needs. Composite fabrics are a new type of fabric made by bonding one or more layers of textile materials, non-woven materials and other functional materials. They can be functionally designed according to actual needs. For example, outdoor fabrics such as jackets and mountaineering clothes need not only to be waterproof and windproof, but also to have good breathability to ensure wearing comfort.

[0003] Currently, most breathable fabrics are laminated fabrics and coated fabrics. Laminated fabrics are made by compounding microporous structure membranes with fabrics through adhesives, and have good air permeability and waterproofness. However, the molding process is complicated, and microporous structure membranes are mostly spun, and the production cost is relatively high. Coated fabrics are compounded by coatings and fabric bases. The molding method is simple and the cost is lower. It is the main production method for clothing fabrics. The most commonly used coated fabrics are polyurethane coatings, but in actual production, the coatings are not very air permeable. The main reason is that it is difficult to form breathable pores during coating molding. Adding porogens can improve the air permeability to a certain extent. However, these porogens are difficult to form uniform pores, which reduces the waterproofness of the coated fabrics, seriously restricting the improvement of the overall performance of the fabrics. Summary of the invention

[0004] In order to solve the technical problems mentioned in the background technology, the purpose of the present invention is to provide a breathable polyester fiber composite fabric and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A breathable polyester fiber composite fabric is composed of a polyester densely woven base fabric and a polyurethane surface layer on the surface, wherein the polyurethane surface layer is formed by curing polyurethane surface slurry, and its components are:

[0007] Modified polyurethane 42-48wt%, emulsifier 0.4-0.5wt%, thickener 1.1-1.5wt%, defoamer 0.2-0.3wt%, colorant 1.2-1.5wt%, color paste 0.8-1wt%, and the balance is water.

[0008] The modified polyurethane is prepared by the following method:

[0009] Step A1: premix diethyl diallylmalonate, 4-fluorophenylethylamine and anhydrous toluene, introduce dry nitrogen for protection, add trimethylaluminum and mix, heat to 90-100° C., stir at 60-90 rpm for 3-4 hours, and evaporate toluene under reduced pressure after the reaction to obtain an intermediate;

[0010] Furthermore, the feed ratio of diethyl diallylmalonate, 4-fluorophenethylamine, trimethylaluminum and anhydrous toluene is 10mmol:20mmol:15-25mg:45-60mL, and trimethylaluminum promotes the ester exchange between 4-fluorophenethylamine and diethyl diallylmalonate amine to introduce a fluorobenzene structure.

[0011] Step A2: Mix the intermediate, azobisisobutyronitrile and ethyl acetate, control the water bath temperature at 55-62°C, apply 120-180 rpm stirring activation for 15-20 min, then apply 150-200 W / m 2 The mixture was subjected to ultraviolet irradiation with high intensity, and mercaptoethanol was slowly added to react for 1.8-2.5 hours. After the reaction was completed, ethyl acetate was removed by rotary evaporation to obtain a modified monomer;

[0012] Furthermore, the feed ratio of the intermediate, mercaptoethanol, azobisisobutyronitrile and ethyl acetate is 10mmol:20mmol:40-60mg:80-100mL, azobisisobutyronitrile activates the double bond of the intermediate, and then click-adds mercaptoethanol under ultraviolet irradiation to introduce alcoholic hydroxyl groups containing thioether structures for end modification.

[0013] Step A3: polyether diol, modified monomer, dibutyltin dilaurate and anhydrous tetrahydrofuran are mixed, nitrogen is introduced for protection, the temperature of a water bath is controlled at 45-50° C., hexamethylene diisocyanate is added, mixed and kept warm for reaction for 1.2-1.5 hours, 1,4-butanediol is added, the temperature is continued to rise to 75-85° C. and the reaction is continued for 25-30 minutes. After the reaction is completed, the residual tetrahydrofuran is removed under reduced pressure to obtain a modified polyurethane;

[0014] Furthermore, the feed ratio of hexamethylene diisocyanate, hydroxyl group of polyether diol, 1,4-butanediol, modified monomer, dibutyltin dilaurate and anhydrous tetrahydrofuran is 0.1mol:90-120mmol:15-25mmol:20-30mmol:0.14-0.2g:60-90mL, the modified monomer and polyether diol are prepolymerized with hexamethylene diisocyanate, and then the macromolecular polymer is formed by chain extension with 1,4-butanediol.

[0015] A method for preparing a breathable polyester fiber composite fabric comprises the following steps:

[0016] Step S1: shearing and emulsifying the modified polyurethane, emulsifier and water, then adding a defoamer, a leveling agent, a colorant and a color paste to mix and adjust the color, and finally adding a thickener to mix and adjust the slurry state to obtain a polyurethane paste;

[0017] Step S2: densely weave the polyester fibers into a base fabric, then apply polyurethane slurry to the surface, and then dry and calender in sequence to obtain a breathable polyester fiber composite fabric.

[0018] Furthermore, the viscosity of the polyurethane paste is 800±50 mPa·s.

[0019] Furthermore, the drying temperature is not higher than 100° C., the calendering temperature is 130-145° C., and the calendering time is 80-110 s.

[0020] Beneficial effects of the present invention:

[0021] The invention discloses a coated composite fabric, which takes a high-strength polyester fiber densely woven base cloth as a base layer, and is coated with a polyurethane surface layer to give the fabric excellent air permeability and waterproof performance. At the same time, the fabric has good softness and high wearing comfort, and has broad application value in outdoor clothing fabrics; the polyurethane surface layer uses a modified polyurethane independently developed as a film-forming main material, which is prepared by ester exchange between 4-fluorophenylethylamine and diallylmalonate diethyl ester amine, and introduces a fluorobenzene structure to obtain an intermediate, and then by double-bond click addition of mercaptoethanol to the intermediate, an alcohol hydroxyl group containing a thioether structure is introduced for end modification to obtain a modified monomer, and finally the modified monomer and polyether diol are pre-blocked with hexamethylene diisocyanate, and 1,4-butanediol is used to extend the chain to form a macromolecular polymer; the polyphenyl ring structure of the modified polyurethane side chain forms a support between macromolecular chains, forming a A large number of microscopic spatial pores are formed, and the fluorine element has a strong segregation effect, which makes it difficult for the benzene ring to be infiltrated and fused, further expanding the pore structure, which is conducive to the improvement of air permeability. In addition, these pore structures are interwoven along the extension direction of the modified polyurethane macromolecules, and the pores are more uniform, which makes it easier to form breathable channels. In the test, the prepared fabric has better air permeability and moisture permeability; compared with the existing porous coating materials, the pore walls of these breathable channels are doped with fluorine elements, and the tension between liquid water and the pore walls is large, and water is not easy to infiltrate the pore walls, which leads to increased capillary resistance and stronger water resistance; in addition, the modified monomer introduces a sulfide structure into the main chain of the modified polyurethane macromolecule, and its sulfide bond has a lower rotational energy barrier, which compensates for the problem of increased coating rigidity caused by the introduction of the fluorobenzene structure, so that the fabric maintains good softness. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1, preparing a breathable polyester fiber composite fabric, including the following implementation method:

[0024] (1) Preparation of modified polyurethane

[0025] Step A1: premix diethyl diallyl malonate, 4-fluorophenethylamine and anhydrous toluene, introduce dry nitrogen protection, add trimethylaluminum and mix, heat to 100°C, and stir at 90 rpm to react for 3 hours, wherein the feed ratio of diethyl diallyl malonate, 4-fluorophenethylamine, trimethylaluminum and anhydrous toluene is 10 mmol: 20 mmol: 25 mg: 60 mL. After the reaction is completed, toluene is evaporated under reduced pressure to obtain an intermediate.

[0026] Step A2: Mix the intermediate, azobisisobutyronitrile and ethyl acetate, control the temperature of the water bath to 62°C, apply 180 rpm stirring to activate for 15 min, then apply 200 W / m 2 The mixture was irradiated with high intensity ultraviolet radiation, and mercaptoethanol was slowly added to react for 1.8 hours, wherein the feed ratio of the intermediate, mercaptoethanol, azobisisobutyronitrile and ethyl acetate was 10mmol:20mmol:60mg:100mL. After the reaction, the ethyl acetate was removed by rotary evaporation to obtain a modified monomer.

[0027] Step A3: Take polyether diol, modified monomer, dibutyltin dilaurate and anhydrous tetrahydrofuran, mix them, pass nitrogen protection, control the temperature of the water bath at 50°C, add hexamethylene diisocyanate, mix and keep warm for reaction for 1.2h, then add 1,4-butanediol, continue to heat to 85°C and continue to react for 25min, wherein the polyether diol is selected from industrial grade N210 raw materials, and the feed ratio of hexamethylene diisocyanate, hydroxyl group of polyether diol, 1,4-butanediol, modified monomer, dibutyltin dilaurate and anhydrous tetrahydrofuran is 0.1mol:120mmol:15mmol:20mmol:0.2g:90mL. After the reaction is completed, the residual tetrahydrofuran is removed under reduced pressure to obtain a modified polyurethane.

[0028] (2) Preparation of composite fabrics

[0029] The raw materials are taken according to weight percentage: 48wt% of modified polyurethane, which is prepared in this embodiment; 0.5wt% of emulsifier, which is MOA-3B polyether emulsifier selected from Nantong Lianli New Materials Co., Ltd.; 1.3wt% of thickener, which is AR-2 raw material selected from Nantong Hantai Chemical Co., Ltd.; 0.2wt% of defoamer, which is GP330 raw material selected from Nantong Lianli New Materials Co., Ltd.; 1.2wt% of colorant, which is 1800 mesh light calcium powder selected from Henan Superfine Calcium Powder Factory; 0.8wt% of color paste, which is EP-14 sky blue color paste selected from Weifang Ruiguang Chemical Co., Ltd.; the balance is supplemented with water to 100wt%.

[0030] Step S1: The modified polyurethane, emulsifier and water are sheared and emulsified at 1500 rpm for 10 minutes, and then a defoamer, a leveling agent, a colorant and a color paste are added to mix and adjust the color, and finally a thickener is added to mix and adjust the slurry state. The viscosity of the slurry is detected to be 830 mPa·s, and the polyurethane surface slurry is obtained.

[0031] Step S2: The polyester fibers are densely woven at a warp and weft density of 180 strands / inch to make a polyester densely woven base fabric, and the surface is woven at a density of 25 mg / cm 2 The polyurethane surface slurry was scraped and dried in an oven at 80°C for 2 hours, and then calendered at 145°C for 80 seconds to form a polyurethane surface layer on the surface of the densely woven base fabric to obtain a composite fabric.

[0032] Example 2, preparing a breathable polyester fiber composite fabric, including the following implementation method:

[0033] (1) Preparation of modified polyurethane

[0034] Step A1: premix diethyl diallyl malonate, 4-fluorophenethylamine and anhydrous toluene, introduce dry nitrogen protection, add trimethylaluminum and mix, heat to 90°C, and stir at 60rpm to react for 4h, wherein the feed ratio of diethyl diallyl malonate, 4-fluorophenethylamine, trimethylaluminum and anhydrous toluene is 10mmol:20mmol:15mg:45mL. After the reaction is completed, toluene is evaporated under reduced pressure to obtain an intermediate.

[0035] Step A2: Mix the intermediate, azobisisobutyronitrile and ethyl acetate, control the temperature in a water bath to 55°C, apply stirring at 120 rpm for 20 min, and then apply 150 W / m 2 The mixture was irradiated with high intensity of ultraviolet light, and mercaptoethanol was slowly added to react for 2.5 hours, wherein the feed ratio of the intermediate, mercaptoethanol, azobisisobutyronitrile and ethyl acetate was 10 mmol: 20 mmol: 40 mg: 80 mL. After the reaction, the ethyl acetate was removed by rotary evaporation to obtain a modified monomer.

[0036] Step A3: Take polyether diol, modified monomer, dibutyltin dilaurate and anhydrous tetrahydrofuran, mix them, pass nitrogen protection, control the temperature of the water bath at 45°C, add hexamethylene diisocyanate, mix and keep warm for reaction for 1.5h, then add 1,4-butanediol, continue to heat to 75°C and continue to react for 30min, wherein the polyether diol is selected from industrial grade N210 raw materials, and the feed ratio of hexamethylene diisocyanate, hydroxyl group of polyether diol, 1,4-butanediol, modified monomer, dibutyltin dilaurate and anhydrous tetrahydrofuran is 0.1mol:90mmol:20mmol:30mmol:0.14g:60mL. After the reaction is completed, the residual tetrahydrofuran is removed under reduced pressure to obtain a modified polyurethane.

[0037] (2) Preparation of composite fabrics

[0038] The raw materials are taken according to weight percentage: 42wt% of modified polyurethane, which is prepared in this embodiment; 0.4wt% of emulsifier, which is MOA-3B polyether emulsifier selected from Nantong Lianli New Materials Co., Ltd.; 1.1wt% of thickener, which is AR-2 raw material selected from Nantong Hantai Chemical Co., Ltd.; 0.3wt% of defoamer, which is GP330 raw material selected from Nantong Lianli New Materials Co., Ltd.; 1.5wt% of colorant, which is 1800 mesh light calcium powder selected from Henan Superfine Calcium Powder Factory; 1wt% of color paste, which is EP-14 sky blue color paste selected from Weifang Ruiguang Chemical Co., Ltd.; the balance is supplemented with water to 100wt%.

[0039] Step S1: The modified polyurethane, emulsifier and water are sheared and emulsified at 1500 rpm for 10 minutes, and then a defoamer, a leveling agent, a colorant and a color paste are added to mix and adjust the color, and finally a thickener is added to mix and adjust the slurry state. The viscosity of the slurry is detected to be 760 mPa·s, and the polyurethane surface slurry is obtained.

[0040] Step S2: The polyester fibers are densely woven at a warp and weft density of 180 strands / inch to make a polyester densely woven base fabric, and the surface is woven at a density of 25 mg / cm 2 The polyurethane surface slurry was scraped and dried in an oven at 80°C for 2 hours, and then calendered at 130°C for 110 seconds to form a polyurethane surface layer on the surface of the densely woven base fabric to obtain a composite fabric.

[0041] Example 3, preparing a breathable polyester fiber composite fabric, including the following implementation method:

[0042] (1) Preparation of modified polyurethane

[0043] Step A1: premix diethyl diallyl malonate, 4-fluorophenethylamine and anhydrous toluene, introduce dry nitrogen protection, add trimethylaluminum and mix, heat to 95°C, and stir at 90 rpm to react for 3.5 hours, wherein the feed ratio of diethyl diallyl malonate, 4-fluorophenethylamine, trimethylaluminum and anhydrous toluene is 10 mmol: 20 mmol: 20 mg: 50 mL. After the reaction is completed, toluene is evaporated under reduced pressure to obtain an intermediate.

[0044] Step A2: Mix the intermediate, azobisisobutyronitrile and ethyl acetate, control the temperature in a water bath to 58°C, apply stirring at 180 rpm for 15 min, and then apply 180 W / m 2 The mixture was irradiated with high intensity of ultraviolet light, and mercaptoethanol was slowly added to react for 2.2 hours, wherein the feed ratio of the intermediate, mercaptoethanol, azobisisobutyronitrile and ethyl acetate was 10 mmol: 20 mmol: 50 mg: 90 mL. After the reaction, the ethyl acetate was removed by rotary evaporation to obtain a modified monomer.

[0045] Step A3: Take polyether diol, modified monomer, dibutyltin dilaurate and anhydrous tetrahydrofuran, mix them, pass nitrogen protection, control the temperature of the water bath at 50°C, add hexamethylene diisocyanate, mix and keep warm for reaction for 1.3h, then add 1,4-butanediol, continue to heat to 80°C and continue to react for 30min, wherein the polyether diol is selected from industrial grade N210 raw materials, and the feed ratio of hexamethylene diisocyanate, hydroxyl group of polyether diol, 1,4-butanediol, modified monomer, dibutyltin dilaurate and anhydrous tetrahydrofuran is 0.1mol:100mmol:25mmol:25mmol:0.16g:80mL. After the reaction is completed, the residual tetrahydrofuran is removed under reduced pressure to obtain a modified polyurethane.

[0046] (2) Preparation of composite fabrics

[0047] The raw materials are taken according to weight percentage: 45wt% of modified polyurethane, which is prepared in this embodiment; 0.4wt% of emulsifier, which is MOA-3B polyether emulsifier selected from Nantong Lianli New Materials Co., Ltd.; 1.5wt% of thickener, which is AR-2 raw material selected from Nantong Hantai Chemical Co., Ltd.; 0.3wt% of defoamer, which is GP330 raw material selected from Nantong Lianli New Materials Co., Ltd.; 1.5wt% of colorant, which is 1800 mesh light calcium powder selected from Henan Superfine Calcium Powder Factory; 0.9wt% of color paste, which is EP-14 sky blue color paste selected from Weifang Ruiguang Chemical Co., Ltd.; the balance is supplemented with water to 100wt%.

[0048] Step S1: The modified polyurethane, emulsifier and water are sheared and emulsified at 1500 rpm for 10 minutes, and then a defoamer, a leveling agent, a colorant and a color paste are added to mix and adjust the color, and finally a thickener is added to mix and adjust the slurry state. The viscosity of the slurry is detected to be 845 mPa·s, and the polyurethane surface slurry is obtained.

[0049] Step S2: The polyester fibers are densely woven at a warp and weft density of 180 strands / inch to make a polyester densely woven base fabric, and the surface is woven at a density of 25 mg / cm 2 The polyurethane surface slurry was scraped and dried in an oven at 80°C for 2 hours, and then calendered at 135°C for 100 seconds to form a polyurethane surface layer on the surface of the densely woven base fabric to obtain a composite fabric.

[0050] Example 4, preparing a breathable polyester fiber composite fabric, including the following implementation method:

[0051] (1) Preparation of modified polyurethane

[0052] Step A1: premix diethyl diallyl malonate, 4-fluorophenethylamine and anhydrous toluene, introduce dry nitrogen protection, add trimethylaluminum and mix, heat to 100°C, and stir at 90rpm to react for 3.2h, wherein the feed ratio of diethyl diallyl malonate, 4-fluorophenethylamine, trimethylaluminum and anhydrous toluene is 10mmol:20mmol:20mg:55mL. After the reaction, evaporate toluene under reduced pressure to obtain an intermediate.

[0053] Step A2: Mix the intermediate, azobisisobutyronitrile and ethyl acetate, control the temperature in a water bath at 60°C, stir at 180 rpm for 20 min, and then apply 150 W / m 2 The mixture was irradiated with high intensity of ultraviolet light, and mercaptoethanol was slowly added to react for 2 hours, wherein the feed ratio of the intermediate, mercaptoethanol, azobisisobutyronitrile and ethyl acetate was 10mmol:20mmol:55mg:90mL. After the reaction, the ethyl acetate was removed by rotary evaporation to obtain a modified monomer.

[0054] Step A3: Take polyether diol, modified monomer, dibutyltin dilaurate and anhydrous tetrahydrofuran, mix them, pass nitrogen protection, control the temperature of the water bath at 50°C, add hexamethylene diisocyanate, mix and keep warm for reaction for 1.4h, then add 1,4-butanediol, continue to heat to 80°C and continue to react for 30min, wherein the polyether diol is selected from industrial grade N210 raw materials, and the feed ratio of hexamethylene diisocyanate, hydroxyl group of polyether diol, 1,4-butanediol, modified monomer, dibutyltin dilaurate and anhydrous tetrahydrofuran is 0.1mol:100mmol:20mmol:30mmol:0.15g:80mL. After the reaction is completed, the residual tetrahydrofuran is removed under reduced pressure to obtain a modified polyurethane.

[0055] (2) Preparation of composite fabrics

[0056] The raw materials are taken according to weight percentage: 45wt% of modified polyurethane, which is prepared in this embodiment; 0.4wt% of emulsifier, which is MOA-3B polyether emulsifier selected from Nantong Lianli New Materials Co., Ltd.; 1.4wt% of thickener, which is AR-2 raw material selected from Nantong Hantai Chemical Co., Ltd.; 0.2wt% of defoamer, which is GP330 raw material selected from Nantong Lianli New Materials Co., Ltd.; 1.5wt% of colorant, which is 1800 mesh light calcium powder selected from Henan Superfine Calcium Powder Factory; 0.9wt% of color paste, which is EP-14 sky blue color paste selected from Weifang Ruiguang Chemical Co., Ltd.; the balance is supplemented with water to 100wt%.

[0057] Step S1: The modified polyurethane, emulsifier and water are sheared and emulsified at 1500 rpm for 10 minutes, and then a defoamer, a leveling agent, a colorant and a color paste are added to mix and adjust the color, and finally a thickener is added to mix and adjust the slurry state. The viscosity of the slurry is detected to be 835 mPa·s, and the polyurethane surface slurry is obtained.

[0058] Step S2: The polyester fibers are densely woven at a warp and weft density of 180 strands / inch to make a polyester densely woven base fabric. The surface is woven at a density of 30 mg / cm 2 The polyurethane surface slurry was scraped and dried in an oven at 80°C for 2 hours, and then calendered at 135°C for 100 seconds to form a polyurethane surface layer on the surface of the densely woven base fabric to obtain a composite fabric.

[0059] Comparative Example 1, referring to Example 4, no modified monomer is added during the preparation of the modified polyurethane, the raw material feeding ratio is 0.1 mol: 130 mmol: 35 mmol: 0.2 g: 100 mL of hexamethylene diisocyanate, hydroxyl group of polyether diol, 1,4-butanediol, dibutyltin dilaurate and anhydrous tetrahydrofuran, and the rest of the implementation process is exactly the same.

[0060] Comparative Example 2, referring to the prior art, adopts double coating composite technology to prepare fabrics, wherein DL 5310 / 1 type raw material is used as the primer. The raw material of DL 5249 is topcoat;

[0061] The preparation method of the composite fabric is as follows: the primer is applied at a rate of 20 mg / cm 2 Scrape and apply on the surface of densely woven fabric, bake at 80℃ for 30min, and then apply 10mg / cm 2 The surface coating agent was applied by knife, and the mixture was baked again for 1 hour, and then calendered at 130° C. for 90 seconds to obtain a composite fabric.

[0062] Samples were taken from the composite fabric prepared as above, and the air permeability test was carried out according to GB / T 5453-1997 standard; the moisture permeability test was carried out according to GB / T 12704.2-2009 standard; and the hydrostatic pressure resistance test was carried out according to GB / T4744-2013 standard. The specific test results are shown in Table 1:

[0063] Table 1

[0064] <![CDATA[Air permeability / mm·s -1 > <![CDATA[Water vapor permeability / g·(m 2 ·d) -1 > Hydrostatic pressure resistance / kPa Example 1 129 3614 90.7 Example 2 185 3872 83.2 Example 3 153 3809 87.5 Example 4 171 3916 86.3 Comparative Example 1 57 425 115.9 Comparative Example 2 107 2912 76.4

[0065] It can be seen from the test results in Table 1 that the composite fabric prepared in the embodiment has good air permeability and moisture permeability, and at the same time has a relatively high resistance to hydrostatic pressure and has excellent waterproof and breathable properties.

[0066] Samples were taken from the composite fabric prepared as above, and the shear and bending indexes of the samples were tested using a KES-F fabric style tester. The specific test results are shown in Table 2:

[0067] Table 2

[0068] <![CDATA[Shearing stiffness / cN·cm -1 > <![CDATA[Flexural stiffness / cN·cm 2 ·cm -1 > Example 1 0.827 0.0219 Example 2 0.959 0.0304 Example 3 0.874 0.0283 Example 4 0.902 0.0276 Comparative Example 1 0.913 0.0255 Comparative Example 2 1.182 0.0387

[0069] It can be seen from the test results in Table 2 that the shear stiffness and bending stiffness of the composite fabric prepared in the embodiment are kept at a low level, and the fabric is softer.

[0070] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0071] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A breathable polyester fiber composite fabric, consisting of a polyester densely woven base fabric and a polyurethane surface layer, characterized in that: The polyurethane surface layer is formed by curing the polyurethane paste, and its components are: 42-48wt% of modified polyurethane, 0.4-0.5wt% of emulsifier, 1.1-1.5wt% of thickener, 0.2-0.3wt% of defoamer, 1.2-1.5wt% of colorant, 0.8-1wt% of color paste, and the balance is water; The modified polyurethane is prepared by the following method: Step A1: premix diethyl diallylmalonate, 4-fluorophenylethylamine and anhydrous toluene, introduce dry nitrogen for protection, add trimethylaluminum and mix, heat to 90-100° C. and stir to react for 3-4 hours. After the reaction is completed, evaporate toluene under reduced pressure to obtain an intermediate; Step A2: Mix the intermediate, azobisisobutyronitrile and ethyl acetate, and stir and activate in a water bath at 55-62°C for 15-20 minutes, then apply 150-200W / m 2 The mixture was subjected to ultraviolet irradiation with high intensity, and mercaptoethanol was slowly added to react for 1.8-2.5 hours. After the reaction was completed, ethyl acetate was removed by rotary evaporation to obtain a modified monomer; Step A3: polyether diol, modified monomer, dibutyltin dilaurate and anhydrous tetrahydrofuran are mixed, nitrogen is introduced for protection, the temperature of a water bath is controlled at 45-50°C, hexamethylene diisocyanate is added, mixed and kept warm for reaction for 1.2-1.5h, 1,4-butanediol is then added, the temperature is continued to rise to 75-85°C and the reaction is continued for 25-30min. After the reaction is completed, the residual tetrahydrofuran is removed under reduced pressure to obtain a modified polyurethane.

2. The breathable polyester fiber composite fabric according to claim 1, characterized in that: The feed ratio of diethyl diallylmalonate, 4-fluorophenylethylamine, trimethylaluminum and anhydrous toluene is 10 mmol: 20 mmol: 15-25 mg: 45-60 mL.

3. The breathable polyester fiber composite fabric according to claim 2, characterized in that: The feed ratio of the intermediate, mercaptoethanol, azobisisobutyronitrile and ethyl acetate is 10mmol:20mmol:40-60mg:80-100mL.

4. The breathable polyester fiber composite fabric according to claim 3, characterized in that: The feed ratio of hexamethylene diisocyanate, hydroxyl group of polyether diol, 1,4-butanediol, modified monomer, dibutyltin dilaurate and anhydrous tetrahydrofuran is 0.1 mol: 90-120 mmol: 15-25 mmol: 20-30 mmol: 0.14-0.2 g: 60-90 mL.

5. A method for preparing the breathable polyester fiber composite fabric according to claim 1, characterized in that: The steps include: Step S1: shearing and emulsifying the modified polyurethane, emulsifier and water, then adding a defoamer, a leveling agent, a colorant and a color paste to mix and adjust the color, and finally adding a thickener to mix and adjust the slurry state to obtain a polyurethane paste; Step S2: densely weave the polyester fibers into a base fabric, then apply polyurethane slurry to the surface, and then dry and calender in sequence to obtain a breathable polyester fiber composite fabric.

6. The method for preparing a breathable polyester fiber composite fabric according to claim 5, characterized in that: The emulsifier is a polyether emulsifier.

7. The method for preparing a breathable polyester fiber composite fabric according to claim 5, characterized in that: The viscosity of the polyurethane paste is 800±50mPa·s.

8. The method for preparing a breathable polyester fiber composite fabric according to claim 5, characterized in that: The drying temperature is not higher than 100°C, the calendering temperature is 130-145°C, and the calendering time is 80-110s.