CN101050599B - Synthetic leather with composite fibers in base material and ultra-fine fibers - Google Patents

Abstract

To provide an artificial leather having a composite fiber in a base material comprising a base material and a resin, wherein the composite fiber constituting the base material is a synthetic leather having an excellent inner and outer texture obtained by subjecting a polyester polymer A and a polyamide polymer B having a high crystallinity to a non-woven fabric production process, a microwave process, a resin process, a grinding process, a kneading process or a rubbing process, and a surface process to an artificial leather comprising a base material and a resin, wherein the composite fiber is obtained by spinning a polyester polymer A having a high crystallinity and a polyamide polymer B having a low crystallinity at a weight ratio of 90: 10 to 10: 90 at a spinning temperature of a spinneret by a composite spinning method (the extrusion temperature of the polyester is set to 200 to 300 ℃ and the extrusion temperature of the polyamide is set to 180 to 290 ℃) so that the cross section of the obtained composite fiber is a radial shape in which the polyester polymer A and the polyamide polymer B are arranged at intervals, and the artificial leather has an almost flat tape-like ultrafine fiber shape obtained without subjecting the polyester polymer A, compared with the conventional round section superfine fiber artificial leather, the artificial leather has better softness and drapability, does not generate waste water in the manufacturing process, and belongs to an environment-friendly product.

Description

Artificial leather with composite fibers in the base material with ultra-fine fibers

technical field

The present invention relates to an artificial leather with composite fibers in a base material having ultra-fine fibers, especially an artificial leather formed from a base material and resin, wherein the base material composite fibers do not need to be processed by alkaline solution or solvent. The shape of ultra-fine fibers that are similar to flat ribbons obtained from the weight reduction and splitting process can be obtained after non-fabric manufacturing processing, microwave processing, hot pressing processing, resin impregnation, grinding, rubbing or impact, and surface bonding processing. Artificial leather with excellent surface texture and compactness. The obtained leather is better in softness and drapability than the conventional round-section microfiber artificial leather. It does not generate waste water during production and is an environmentally friendly product. the

Background technique

Most of the known microfiber artificial leathers use solvents or alkaline solutions for weight reduction and fiber splitting. In the case of Chinese Taiwan Patent Application No. 76102732 "Novel Preparation of Superfine Fibers and Their Fabricated Fabrics", the outer surface of the fibers is It has a layer of polyester film. When opening the fiber, it must first dissolve the outer polyester film with lye, and then use mechanical fiber splitting to split the fiber. However, this process often causes serious water pollution. . the

Also, Taiwan Patent Application No. 83108507 "Natural fiber opening method for composite fibers" utilizes a false twister to mechanically open fibers, but this method does not work well when the number of divisions is too large. the

In addition, China Taiwan Patent Application No. 79108906 "Fibering Treatment Method for Composite Fibers and Fabrics thereof", although the fiber sections are also arranged at intervals in the shape of two polymers, polyamide and polyester, but due to the two This kind of polymer has a good affinity, so benzyl alcohol, caustic soda or acidic liquid and other polluting substances must be used to dissolve polyamide or polyester to separate the fibers, which often causes serious water pollution during production. the

In addition, China Taiwan Patent Application No. 81100302 "Ultrafine Fiber Fiber Opening Method and Dyeing Color Concentration Method" uses an acidic solution to dissolve polyamide to obtain polyester ultrafine fibers. liquid, it is difficult to treat the resulting wastewater. the

Japanese Patent Laying-Open 5-331758's "Manufacturing Method of Ultrafine Fibers" utilizes the appropriate affinity of the two polymers to make it difficult to separate fibers during carding and needle rolling, but during mechanical fiber separation processing due to boiling water The difference in shrinkage makes the fibers easy to split. This method is not effective when the number of divisions is too large. the

Japanese Patent Laid-Open No. 5-51820 "Split Type Composite Fiber", the fiber is opened by modifying PET (polyethylene terephthalate) so that it is easy to reduce the weight, and the cross-section is arranged at two intervals, so the weight reduction The rate is particularly high, but it is still necessary to use caustic soda and other polluting alkaline substances to dissolve PET during fiber separation, so it will cause serious water pollution during production. the

Contents of the invention

In view of the problems caused by the above-mentioned weight reduction and fiber-dividing treatment, which often need to be carried out by alkaline solution or solvent, and in order to obtain artificial leather with superior softness and drapability, the inventors found that the crystallinity of 40% to 95% The high crystallinity polyester polymer A and the low crystallinity polyamide polymer B with a crystallinity of 1 to 25% are prepared by composite spinning in a weight ratio of 90:10 to 10:90. A composite fiber with a radial shape in cross-section. The composite fiber is made into a non-fabric by needlepunch, spunlace or spunbond. The non-fabric is first impregnated with water and then radiated with microwaves. Treatment to remove water without using alkaline solution or solvent can split the polymer A and polymer B of the composite fiber into a flat ribbon-shaped fiber-opening state and at the same time shrink the non-fabric. The obtained base cloth is hot-pressed at a temperature of 100-200°C so that the density of the base cloth is 0.15-0.45g/cm ³ , and then the base cloth is impregnated with resin to obtain the base material of the semi-finished artificial leather, and then ground, After kneading or bumping and surface laminating processing, the artificial leather with excellent internal and surface texture compactness and composite fibers of the base material with flat strip-shaped ultra-fine fibers can be obtained, so as to complete the present invention.

The composite fiber in the base material relevant to the present invention has the artificial leather of ultra-fine fiber, is the high crystallinity polyester polymer A of crystallinity 40%～95% and the low crystallinity polymer A of crystallinity 1～25%. The amide polymer B is spun by composite spinning at a weight ratio of 90:10 to 10:90. The extrusion temperature of the polyester is 200-300°C, and the extrusion temperature of the polyamide is 180-290°C. The spinning temperature of the spinneret (the spinneret is in a radial shape, so that the polyester polymer A and the polyamide polymer B are extruded at intervals during spinning) is 200-290 °C, and the winding speed is 300 °C. ~2000m/min can produce unstretched composite fiber filaments with a monofilament fineness (dpf) of 5~20 deniers (den); with an air drafting speed of 3500~7000m/min, a monofilament fineness (dpf) can be obtained 2-10 denier fully extended composite fiber filaments. The cross-section of the fiber is arranged with components A and B at intervals and the number is 24 to 128 in the shape of an orange segment radial fan-shaped fiber (the cross-section of the fiber is shown in Figure 1A, B, and C). the

Fibers obtained by composite spinning, ultrafine fibers formed therefrom, and various production methods thereof are known. Fibers obtained by composite spinning are generally produced by extruding at least two compatible fiber polymers and combining them into one. the

The above-mentioned unstretched composite fiber yarn is stretched, wrinkled and oiled, and then cut into cotton to obtain a single filament fiber of 2-10 denier composite fiber staple cotton (staple fiber). the

The short-fiber cotton is made into a non-fabric with a basis weight of 100-700 g/ ^m2 through opening, carding, and stacking by needle rolling or water rolling.

The above-mentioned composite fully extended yarns produced by the spunbond method can be directly laid up to a weight of 100-700 g/m ² , and then the fibers are entangled with each other by a needle rolling mill or a water rolling mill to form a non-woven fabric.

Water rolling process usually impacts the fibers with water column to entangle each other, and at the same time, the composite fiber is subjected to hydraulic impact to separate the two components of polyester and polyamide to obtain superfine fibers. Then use fine water column to form turbulent flow on the surface of the non-fabric and trim the surface to obtain a non-fabric with a weight per unit area of 100-700g/ ^m2 .

First, the non-fabric is treated with an aqueous solution so that the water weight is 0.5-50% of the cloth weight, and then 1 g of water is evaporated at an evaporation rate of 10 watts to 500 watts per minute for microwave radiation. At this time, the non-fabric will be damaged due to (1) The crystallinity of the two-component polymers A and B in the composite fiber is very different, and the high temperature generated during microwave irradiation will cause the two-component polymers A and B to split due to the large difference in thermal shrinkage; ( 2) Furthermore, due to the large water content of low-crystallinity polyamide B, when exposed to microwaves, the internal water instantly expands into a gaseous state and is ejected from the junction of the two-component polymers A and B. This can be used Spraying force can make the two-component polymer easier to split without the need of alkaline solution or solvent for fiber reduction treatment. the

Moreover, due to the influence of low-crystallinity polyamide, the non-woven fabric shrinks, and the area shrinkage rate of the non-woven fabric can reach 5-35%, so as to obtain a superfine fiberized base cloth. Based on the above two characteristics, even if the two components in the composite fiber: polymer A and polymer B are in a radial shape through the spinneret, polyester polymer A and polyamide polymer B are squeezed at intervals during spinning. Extruded into a number of 24 to 128 composite fibers in the shape of an orange segment radial fan, the fibers can be easily opened after this microwave irradiation treatment (polymer A and polymer B in the composite fiber are split to form a fiber open state, as shown in Figure 2A, B , C shown). The spinnerets are arranged in 24-128 radial fans in the shape of orange segments, which is more suitable for making ultra-fine fibers in the form of flat ribbons for the composite fibers of the base material in the artificial leather obtained by the method of the present invention. When the number of arrays is 24 or less, the resulting conjugated fiber is not a flat ribbon-shaped ultrafine fiber. When the number of arrays is more than 128, it is not easy to open fibers by microwave irradiation treatment alone, and it is not suitable. the

Hot water shrinkage treatment at 60-100°C can be added before and after the above-mentioned microwave radiation processing, so that the appearance of the fiber after splitting is flat and ribbon-like, as shown in Figure 3, which can make the base material of the artificial leather semi-finished product feel more compact . The fiber length a after splitting can be 5-70mm, the radial dimension b of the section can be 2-25μm (about 0.03-5den), and the transverse dimension c of the section can be 0.5-8μm (about 0.004-0.5den) . The preferred range of fiber size after splitting is that the length a is 38-64 mm, the radial dimension b of the cross-section is 8-20 μm (about 0.5-3 den), and the transverse dimension c of the cross-section can be 1-5 μm (about 0.008-0.2 den). ). the

The used high crystalline polyester polymer A of the inventive method has polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT) etc. Ester polymers. the

The used low crystallinity polyamide polymer B of the inventive method has (a) one of its monomer is adipic acid, azelaic acid, terephthalic acid, isophthalic acid, cyclohexane-1,4- Dicarboxylic acid, 1,6 hexanediamine, trimethyl-1,6 hexanediamine, 4,4'-diamino-dicyclohexylmethane (PACM), 4,4'diamino-dicyclohexylpropane, Polyamide polymers of isophorone diamine, caprolactam, laurolactam, 4,4'-dimethyl diisocyanate or toluene diisocyanate; (b) polyamide polymer components Polyamide-based copolymers containing polyamide 6, polyamide 66, polyamide 11, polyamide 610, and 4,4'-diamino-dicyclohexylmethane 6 (PCAM 6). the

The aforementioned high crystalline polyester polymer A can be added with 5-50% modified co-polymerized polyester such as polyethylene terephthalate containing SIPE (SIP (sodium sulfonic acid)) 1-10% by mole, so that The polar groups of the polyester are increased to adjust the adjacent interface with the low crystallinity polyamide and the cross-sectional shape of the fiber. the

The microwave-treated non-fabric is impregnated with water-based PU (polyurethane) resin, dried or impregnated with solvent-based PU resin, solidified, washed with water, and dried to obtain the base material of semi-finished superfine fiber artificial leather. the

If it is then impregnated with water-based polyurethane (PU) resin, the base material of the semi-finished ultra-fine fiber artificial leather can be made into an environmentally friendly ultra-fine fiber artificial leather. the

Grinding the surface of the environmentally friendly ultra-fine fiber artificial leather can make the thickness uniform, and the fine hairiness on the surface can be more dispersed and fine. Later, it can be rubbed by a kneading machine or impacted by a drum machine or a high-speed air machine or The liquid flow dyeing machine and other methods make the fibers inside the base material more split and the leather surface texture more detailed. the

The ultra-fine fiber artificial leather prepared by the present invention does not need to be treated with alkaline solution or solvent for weight reduction and fiber splitting in the fiber splitting process, and there is no concern about environmental pollution, and the composite fiber of the base material can be flat. Ribbon-shaped ultra-fine fibers, very suitable for artificial leather, wipes, electronic abrasives or fabrics, etc. the

Description of drawings

Fig. 1A, B, C are the schematic diagrams that the ultra-fine fibers of the composite fibers of the base material related to the present invention are arranged at intervals of A and B components and are segmental-orange radiating fan-shaped fibers;

Fig. 2A, B, C are the schematic diagrams of the superfine fiber of the composite fiber of the base material related to the present invention with A and B components in a radial shape and in the shape of a segmented radial fan with the spinneret;

Fig. 3 is the schematic diagram of the fiber after the ultra-fine fiber of the composite fiber of the base material related to the present invention after fiber splitting;

Fig. 4 is the electron microscope enlarged view of the cross-section of the composite fiber of the base material related to the present invention through cutting into fiber cotton;

Fig. 5 is the electron microscope enlarged view of the ultra-fine fiber section of the composite fiber of the base material related to the present invention;

Fig. 6 shows that the appearance of the composite fiber of the base material related to the present invention is split into 32 equal parts in the form of a flat ribbon, the radial dimension is 12 μm, and the transverse dimension is 2.3 μm. Electron microscope magnification of a cross-section of leather. the

Detailed ways

The technical characterictic of the method of the present invention is described in detail below with the composite fiber tool flat strip-shaped ultra-fine fiber artificial leather of 32 split substrates obtained in Examples 1 to 3, but the present invention is not limited thereto; The 37 island-sea island type microfiber artificial leather is a comparative example. the

Example 1

With PET (polyethylene terephthalate IV (limiting viscosity)=0.64, China Taiwan Far East Textile Co., Ltd. manufactures)/NY6 (polyamide RV (relative viscosity)=2.4 German BASF company manufactures), with 55/ The weight ratio of 45 is used for composite spinning, the spinneret has 32 fan-shaped radial arrangements, spinning at a spinning temperature of 295°C, and a coiling speed of 850m/min, which can obtain a fineness of 8den, an elongation of 450%, and a strength of 1.7g/ den's unextended composite filament (UDY). The unstretched composite fiber yarn is stretched at a stretching ratio of 200%, and the temperature of the stretching roller is 50°C, and dried at a drying temperature of 60°C. Fiber cotton with a length of 51 mm, the cross section of the fiber cotton is shown in Figure 4. the

The fiber cotton is processed through the steps of opening, carding, stacking, and needle rolling to obtain a non-fabric with a width of about 153 cm, a basis weight of 250 g/m ² , and a thickness of 1.8 mm. The non-fabric is soaked in water for 3 minutes. Squeeze out the excess water with the pressure roller so that the ratio of the water amount to the cloth weight is 0.5:1, and then use a microwave treatment equipment with microwave energy at an evaporation rate of 100 watts per minute to evaporate 1 gram of water for 1 minute, so that the composite fibers are cracked. Figure 5 shows ultra-fine fibers divided into 32 equal parts, with a radial dimension of 12 μm and a transverse dimension of 2.3 μm. The non-fabric is hot-pressed with a hot-pressing wheel at 150°C to make the non-fabric density 0.25g/cm ³ , and then impregnated with a water-soluble resin to obtain the base material of the semi-finished ultra-fine fiber artificial leather. Sandpaper specifications: 240mesh) Grind the surface of the substrate, knead it with a kneading machine 10 times per minute, and finally paste the surface with water-based PU resin to obtain a 1.5mm thick ultra-fine fiber artificial leather, which is electronically displayed. Micro-observe the cross-section fiber opening of the ultra-fine fiber artificial leather, as shown in Figure 6.

Example 2

Composite with PBT (polybutylene terephthalate, IV=0.94, manufactured by China Taiwan Changchun Petrochemical Co., Ltd.)/NY6 (polyamide, RV=2.7, manufactured by German BASF Company) with a weight ratio of 50/50 Spinning, the spinneret has 32 fan-shaped radial arrangements, spinning at a spinning temperature of 280°C, and a take-up speed of 1350m/min, to obtain unstretched composite fibers with a fineness of 10den, an elongation of 550%, and a strength of 1.5g/den Silk (UDY). The unstretched composite fiber yarn is stretched at a stretching ratio of 300%, and the temperature of the stretching roller is 70°C, and dried at a drying temperature of 70°C. Fiber cotton with a length of 51mm. the

The fiber cotton is processed through the steps of opening, carding, stacking, and needle rolling to obtain a non-fabric with a width of about 153 cm, a basis weight of 280 g/m ² , and a thickness of 2.2 mm. The non-fabric is soaked in water for 2 minutes. Squeeze out the excess water with the pressure roller so that the ratio of the water amount to the cloth weight is 0.8:1, and then use the microwave treatment equipment with microwave energy at an evaporation rate of 50 watts per minute to evaporate 1 gram of water for 1.5 minutes to split the composite fiber. It is divided into 32 equal parts, flat ribbon-shaped ultra-fine fibers with a radial dimension of 12 μm and a transverse dimension of 2.3 μm. The non-fabric is hot-pressed with a hot-pressing wheel at 140°C to make the non-fabric density 0.27g/cm ³ , and then the non-fabric is impregnated with solvent-based PU resin after coagulation, washing and drying to obtain the base material of semi-finished superfiber artificial leather , then use a grinding machine (sandpaper specifications: 150 and 240 mesh) to grind the surface of the substrate, and knead it with a kneading machine that kneads 10 times per minute, and finally paste the surface with water-based PU resin to get a super extreme thickness of 1.5mm Microfibre faux leather.

Example 3

Polybutylene terephthalate with PBT (polybutylene terephthalate IV=0.94, manufactured by China Taiwan Changchun Petrochemical Co., Ltd.) and CO-PET (containing SIPE (SIP (sodium sulfonate)) 2.5% by mole Ethylene glycol, manufactured by Xinguang Synthetic Fiber Co., Ltd., Taiwan, China) is first mixed with NY6 (polyamide RV=2.4, manufactured by BASF, Germany) with a weight ratio of 50/50 to carry out composite spinning with 70/30 ratio , the spinneret has 32 fan-shaped radial arrangements, spinning at a spinning temperature of 282°C, and a take-up speed of 1350m/min, to obtain unstretched composite fiber filaments with a fineness of 12den, an elongation of 550%, and a strength of 1.5g/den (UDY). The unstretched composite fiber yarn is stretched at a stretching ratio of 300%, and the temperature of the stretching roller is 70°C, and dried at a drying temperature of 70°C. Fiber cotton with a length of 51mm. The fiber cotton is processed through the steps of opening, carding, stacking, and needle rolling to obtain a non-fabric with a width of about 153 cm, a basis weight of 230 g/m ² , and a thickness of 2.0 mm. The non-fabric is soaked in water for 3 minutes. Squeeze out the excess water with the pressure roller so that the ratio of the water amount to the cloth weight is 0.5:1, and then use a microwave treatment equipment with microwave energy at an evaporation rate of 25 watts per minute to evaporate 1 gram of water for 1 minute, so that the composite fibers are cracked. Divided into 32 equal parts, the radial dimension is 12μm, and the transverse dimension is 2.3μm ultrafine fiber. The non-fabric impregnated with solvent-based PU resin is coagulated, washed with water, and dried to obtain a semi-finished leather base material, and then the surface of the base material is ground by a grinder (sandpaper specifications: 150 and 240 mesh), and rubbed at a rate of 20 times per minute. The kneading machine kneads the kneading, and the surface is finally pasted with water-based PU resin to obtain a super-fine fiber artificial leather with a thickness of 1.3mm.

Comparative example (1)

The 32-divided superfine fiber made of polyester and polyamide is spun by a composite spinning method. The cross-section of the fiber is two polymers arranged radially in a fan shape and 37 islands with polyester and polyamide as raw materials. The superfine fiber is spun by composite spinning method, and the cross section of the fiber is polyamide polymer as island phase, and polyester polymer as sea phase. the

Compare the advantages and disadvantages of artificial leather made of 32-split microfiber and 37 island-sea-island microfiber. fiber shape Fiber fineness leather thickness weight unit den mm g/ ^m2 measurement method ASTM D-1577 ASTM D-1777 ASTM D-3776 32 split microfiber flat 0.04～5 1.5 545 37 island island type microfiber round 0.07～0.1 1.5 550 Tear strength (longitudinal) Tear strength (transverse direction) Tensile strength (longitudinal) Tensile strength (transverse direction) unit kg kg Kg/cm Kg/cm measurement method ASTMD-2262 ASTM D-2262 ASTM D-1682 ASTM D-1682 32 split microfiber 13.2 12.5 70 55 37 island island type microfiber 11.7 10.8 65 47 Peel strength (longitudinal) Peel strength (transverse direction) Bursting strength hardness degree unit Kg/3cm Kg/3cm Kg/ ^cm2 Spend measurement method DIN 53357 DIN 53357 ASTM-D3786 TM-029(Sanfang) 32 split microfiber 18 13.5 43 5.5 37 island island type microfiber 14.8 10 30.5 3.8

It is known from the attached table that the strength of 32-split microfiber artificial leather is higher than that of 37-island type microfiber artificial leather. This is because there is no weight loss when splitting superfine fibers, so that the non-woven structure is not damaged and the strength is high. Still maintained; on the other hand, in the comparison of leather softness, the softness of 32-split microfiber artificial leather is higher than that of 37 island-sea island type microfiber artificial leather, which is caused by the flattening of fibers. the

The value of softness and hardness indicates: 0-10 degrees, the higher the value, the higher the softness. the

Compare the advantages and disadvantages of the artificial leather made of 32 split microfibers and 37 island-sea-island microfibers in terms of manufacturing process. Reduced processing weight loss Process Energy consumption environmental pollution 32 split microfiber unnecessary none Simple 50% less energy consumption than 37 island microfiber No waste water and waste gas 37 island island type microfiber want About 20～40% complex high energy consumption Wastewater, waste gas and reduced waste

It can be seen from the attached table that 32-split microfiber is better than 37-island type microfiber artificial leather in terms of environmental protection, energy and manufacturing procedures. In terms of energy consumption, the use of microwave radiation processing for fiber splitting is better than that of traditional ovens. Both time and energy savings are greatly improved. the

Claims (10)

1. The artificial leather of composite fiber tool ultrafine fiber in a kind of base material, it is characterized in that, be the high crystallinity polyester polymer A of crystallinity 40%～95% and crystallinity 1～25% low Crystallinity polyamide polymer B is spun by composite spinning at a weight ratio of 90:10 to 10:90 at a spinneret spinning temperature of 200 to 300°C, that is, the polyester extrusion temperature is set to 200-300°C, the polyamide extrusion temperature is set at 180-290°C, so that the cross-section of the obtained composite fiber is in the shape of an orange segment radial fan with polyester polymer A and polyamide polymer B arranged at intervals, and the composite fiber The fiber is made into a non-fabric by needle rolling method, water rolling method or spunbonding method, and the non-fabric is treated with an aqueous solution, and then the water is removed by microwave irradiation, so that the polymer A and polymer B of the composite fiber are split to form In the fiber-opened state, the base fabric obtained by splitting the non-woven fabric is subjected to hot pressing at a temperature of 100-200°C to make the base fabric density 0.15-0.45g/cm ³ , and then the base fabric is impregnated or coated with resin. The base material of ultra-fine fiber artificial leather. 2. The composite fiber in the base material according to claim 1 has an artificial leather with ultra-fine fibers, characterized in that: the base material can grind the surface to make the fine hairiness on the surface more dispersed and fine, and then by kneading Machine kneading or drum impacting or high-speed air flow machine or liquid flow dyeing machine can make the inner fibers of the base material more split and the surface texture more delicate, and the ultra-fine fiber artificial leather can be obtained. 3. The artificial leather of the composite fiber tool ultrafine fiber in the base material according to claim 1, characterized in that: the polymer A and the polymer B of the composite fiber are split to form the crack when the fiber state is opened. The separated fiber is a flat ribbon-shaped ultra-fine fiber with a length a of 5-70 mm, a cross-sectional radial dimension b of 2-25 μm, and a cross-sectional transverse dimension c of 0.5-8 μm. 4. the composite fiber in the base material according to claim 1 has the artificial leather of ultra-fine fiber, it is characterized in that: this high crystallization polyester polymer A is meant by polyethylene terephthalate (PET) At least one selected from the group consisting of polytrimethylene terephthalate (PTT) and polybutylene terephthalate (PBT) polyester polymers. 5. the composite fiber in the base material according to claim 1 has the artificial leather of ultrafine fiber, it is characterized in that: this low crystallinity polyamide polymer B means that one of the monomers is composed of adipic acid, nonyl Diacid, terephthalic acid, isophthalic acid, cyclohexane-1,4-dicarboxylic acid, 1,6-hexanediamine, trimethyl-1,6-hexanediamine, 4,4'-diamino -dicyclohexylmethane (PACM), 4,4'-diamino-dicyclohexylpropane, isophorone diamine, caprolactam, laurolactam, 4,4'-dimethyl diisocyanate and toluene di At least one selected from polyamide-based polymers made of isocyanic acid. 6. The composite fiber in the base material according to claim 1 has an artificial leather with ultra-fine fibers, characterized in that: the low crystallinity polyamide polymer B refers to the polyamide polymer composition containing polyamide Polyamide-based copolymers of amine 6, polyamide 66, polyamide 11, polyamide 610, 4,4'-diamino-dicyclohexylmethane 6 (PCAM 6). 7. the composite fiber in the base material according to claim 1 has the artificial leather of superfine fiber, it is characterized in that: this microwave irradiation step is the evaporation of the water that evaporates 1 gram per minute at 10 watts～500 watts rate. 8. the composite fiber in the base material according to claim 1 has the artificial leather of ultrafine fiber, it is characterized in that: the spinneret in this spinneret is to be radial shape, makes polyester polymerize when spinning Material A and polyamide polymer B are extruded at intervals to form 24 to 128 composite fibers in the shape of orange segment radial fans. 9. The composite fiber in the base material according to claim 1 has the artificial leather of superfine fiber, it is characterized in that: this high crystalline polyester polymer A is added with 5～50% containing SIPE (SIP ( Sulfonic acid sodium salt)) 1-10% molar percentage of polyethylene terephthalate. 10. The artificial leather with composite fibers having superfine fibers in the base material according to claim 1, characterized in that: before and after the microwave irradiation step, hot water at 60-100° C. is used for shrinkage treatment.

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