CN115852702A - Waterborne polyurethane suede microfiber leather and preparation method thereof - Google Patents
Waterborne polyurethane suede microfiber leather and preparation method thereof Download PDFInfo
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- 239000004814 polyurethane Substances 0.000 title claims abstract description 122
- 229920001410 Microfiber Polymers 0.000 title claims abstract description 102
- 239000010985 leather Substances 0.000 title claims abstract description 97
- 239000003658 microfiber Substances 0.000 title claims abstract description 87
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 239000000835 fiber Substances 0.000 claims abstract description 345
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 232
- 239000002131 composite material Substances 0.000 claims abstract description 115
- 239000000758 substrate Substances 0.000 claims abstract description 93
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000005470 impregnation Methods 0.000 claims abstract description 20
- 238000000227 grinding Methods 0.000 claims abstract description 16
- 239000006185 dispersion Substances 0.000 claims abstract description 14
- 239000004744 fabric Substances 0.000 claims description 43
- 238000005299 abrasion Methods 0.000 claims description 38
- 239000002904 solvent Substances 0.000 claims description 19
- 238000004080 punching Methods 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 16
- 239000010410 layer Substances 0.000 description 227
- 230000000052 comparative effect Effects 0.000 description 29
- 229920005989 resin Polymers 0.000 description 18
- 239000011347 resin Substances 0.000 description 18
- 238000005516 engineering process Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- FJQXCDYVZAHXNS-UHFFFAOYSA-N methadone hydrochloride Chemical compound Cl.C=1C=CC=CC=1C(CC(C)N(C)C)(C(=O)CC)C1=CC=CC=C1 FJQXCDYVZAHXNS-UHFFFAOYSA-N 0.000 description 5
- 239000002649 leather substitute Substances 0.000 description 4
- 239000011527 polyurethane coating Substances 0.000 description 4
- 239000002356 single layer Substances 0.000 description 4
- 239000002759 woven fabric Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000009960 carding Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
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- 238000002791 soaking Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
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Abstract
The invention relates to a waterborne polyurethane suede microfiber leather and a preparation method thereof, wherein the waterborne polyurethane suede microfiber leather comprises a suede layer and a substrate layer, the substrate layer consists of a low-density substrate layer and a high-density substrate layer, and the suede layer is a fluff structure formed by buffing and raising the surface of the low-density substrate layer, which is far away from the high-density substrate layer; the low-density substrate layer comprises a low-needling-density superfine fiber non-woven fabric framework structure and water-based polyurethane resin which is filled in the framework structure and is in a discontinuous dispersion state; the high-density substrate layer comprises a high-needling-density superfine fiber non-woven fabric skeleton structure and continuous dispersed aqueous polyurethane resin filled in the skeleton structure; the fibers in the low-needling-density superfine fiber non-woven fabric framework structure penetrate through the high-needling-density superfine fiber non-woven fabric framework structure in a needling manner; the method comprises the following steps: firstly preparing composite sea-island fiber non-woven fabric, then adopting aqueous polyurethane resin impregnation liquid to impregnate, solidifying, reducing and splitting fiber, and grinding and raising skin. The method is simple, and the product has good wear resistance.
Description
Technical Field
The invention belongs to the technical field of superfine fiber synthetic leather, and particularly relates to waterborne polyurethane suede superfine fiber leather and a preparation method thereof.
Background
Aqueous polyurethanes are new polyurethane systems in which water is used as the dispersion medium instead of an organic solvent, and are also referred to as water-dispersed polyurethanes, aqueous polyurethanes, or water-based polyurethanes. The waterborne polyurethane is green, environment-friendly, safe and reliable, and can avoid the problems of pollution of harmful solvents, subsequent treatment and the like compared with solvent type polyurethane. In recent years, the preparation of waterborne polyurethane has been advanced to a certain extent, and waterborne polyurethane is not yet the mainstream green environmental-friendly resin.
In the field of superfine fiber synthetic leather, the manufacturing process of suede superfine fiber leather is mostly as follows: the method comprises the steps of needling the sea-island fibers into non-woven fabrics, then soaking polyurethane and curing, then extracting sea components from the sea-island fibers so as to form microfiber leather base fabrics after ultrafine fibers of the sea-island fibers are formed, finally performing post-processing and finishing procedures such as splitting, buffing, dyeing and the like on the microfiber leather base fabrics according to different customer requirements, and finally manufacturing the suede microfiber leather.
During impregnation of the polyurethane and curing it was found that: after the non-woven fabric is impregnated with the waterborne polyurethane, the waterborne polyurethane can only be adsorbed on the surface of the fiber, the waterborne polyurethane is cured by heating, and in the heating and curing process, the high polymer particles dispersed in water volatilize along with the water, and the particles move and are stacked, so that the continuity of a resin film on the structure is poor, the resin is locally and non-uniformly adhered and cured on the surface of the fiber in the non-woven fabric, and the resin formed after the waterborne polyurethane is cured is discontinuous. In the dipping process of the solvent type polyurethane, the solvent type polyurethane is buried in the space in the non-woven fabric, the solvent is replaced by water to solidify the polyurethane, and the resin formed after the solvent type polyurethane is solidified is continuous. Therefore, compared with the traditional solvent-based polyurethane, due to the incomplete continuity of the resin formed after the waterborne polyurethane is cured, the continuous coating of the waterborne polyurethane on the fiber is poor, the fiber holding power is weak, and the Martindale abrasion resistance of the waterborne polyurethane microfiber leather is poor.
The aqueous polyurethane can only be attached to the surface of the fiber during the impregnation process, when the number of the fibers is too small, the contact between the fibers is not tight enough, the gaps between the fibers are large, and the aqueous polyurethane attached to the surface of each fiber is difficult to collide to form a continuous phase, so that the aqueous polyurethane is usually in a dispersed state. The entanglement saturation state of fibers in the non-woven fabric and the tightness degree between the fibers are improved by improving the needling density of the non-woven fabric, so that the aqueous resins dispersed on the surfaces of the fibers are possibly contacted with each other and fused into a continuous state, a continuous coating state similar to solvent type polyurethane is obtained, the coating property of the aqueous polyurethane on the fibers after impregnation, reduction and fiber splitting is further improved, and the Martindale wear resistance of the aqueous polyurethane microfiber leather is improved. When the needling density is 2500-3200 needles/cm 2 The best martin abrasion resistance can be obtained, when the needling density is too low, the entanglement is too little, and when the needling density is too high, the fiber breakage is serious, the fiber is shortened, and the fiber is easy to fall off during friction.
Compared with woven fabrics, the non-woven fabrics are entangled by needling, the woven fabrics are cloth surfaces formed by interweaving warp and weft directions, the non-woven fabrics are far more fluffy than the woven fabrics, the woven fabrics are very compact and are not beneficial to obtaining suede leather with good hand feeling, therefore, the non-woven fabrics are usually used as a framework structure of the suede leather, however, as mentioned above, the entanglement between the fibers is realized by needling, the entanglement is too less when the needling is too less, the fiber fracture is too much when the needling is too much, and the surface fiber of the suede leather is easy to wear and fall off in a wear resistance test.
Disclosure of Invention
The invention aims to further improve the martindale wear-resisting property of the waterborne polyurethane suede microfiber leather on the basis of improving the needling density of a non-woven fabric in the prior art and provide an effective solution for improving the martindale wear-resisting property of the waterborne polyurethane suede microfiber leather, and particularly provides the waterborne polyurethane suede microfiber leather and a preparation method thereof.
A waterborne polyurethane suede microfiber leather comprises a suede layer and a base layer;
the base layer consists of a low-density base layer and a high-density base layer, and the suede layer is a fluff structure formed by grinding and raising the surface of the low-density base layer, which is far away from the high-density base layer;
the low-density substrate layer comprises a low-needling-density superfine fiber non-woven fabric framework structure and water-based polyurethane resin which is filled in the framework structure and is in a discontinuous dispersion state; the high-density substrate layer comprises a high-needling-density superfine fiber non-woven fabric skeleton structure and water-based polyurethane resin which is filled in the high-needling-density superfine fiber non-woven fabric skeleton structure and is in a continuous dispersion state;
the fibers in the low-needling-density superfine fiber non-woven fabric framework structure penetrate through the high-needling-density superfine fiber non-woven fabric framework structure in a needling manner;
the thickness of the low-density basal layer is 0.2-0.3mm, and the thickness of the high-density basal layer is more than 0.6mm; the needling density of the low needling density superfine fiber non-woven fabric skeleton structure is 550-900 needles/cm 2 The needle punching density of the high needle punching density superfine fiber non-woven fabric skeleton structure is 3000-4500 needles/cm 2 。
The low density substrate layer of the present invention acts as an abrasion resistant barrier. The low-density substrate layer of the invention should have a thickness of at least 0.2mm so that wear during wear will only occur in the low-density substrate layer, while the low-density substrate layer should not exceed 0.3mm because the fibers in the low-density substrate layer are loose and difficult to load to obtain a more continuous distribution of polyurethane. Furthermore, since the firmness of the fibres in the low-density substrate layer is based on the entanglement of the fibres in the low-density substrate layer in the high-density substrate layer, and the entanglement is sufficiently wrapped by the polyurethane, the thickness of the high-density substrate layer should be increased as much as possible (at least 0.6 mm) when the low-density substrate layer meets the abrasion-resistant thickness.
The types of the non-woven fabrics are different according to different scenes of non-woven fabric application, the needling density is an important parameter of the non-woven fabrics, and the needling density of the non-woven fabrics which are usually suitable for preparing solvent type polyurethane microfiber leather is 2000-2800 needles/cm 2 The suede leather performance analysis of the non-woven fabric suitable for the water-based polyurethane resin impregnation requires 2500-3200 needles/cm according to the performance analysis of the suede leather made of the single-layer non-woven fabric with different needling densities 2 When the needling density is too low, the tightness among the fibers is too low, the distribution of the waterborne polyurethane resin with certain continuity cannot be obtained, and a composite structure with the fibers as a framework structure and the waterborne polyurethane resin as a continuous phase is constructed; when the needling density is too high, the broken fibers are more likely to detach from the matrix because the fibers are too severely broken.
The high-needling density superfine fiber non-woven fabric skeleton structure of the high-density substrate layer has the needling density of 3000-4500 needles/cm 2 Because the low-density substrate layer has a certain thickness and cannot be worn to the high-density substrate layer, the high-density substrate layer does not have the problem that the fibers are easy to fall off due to breakage, so that the needling density of the high-density substrate layer can be further improved to improve the compactness between the fibers, more sufficient and continuous polyurethane coating and higher fiber entanglement are formed, and certainly, the needling density of the high-density substrate layer cannot be too high, and the fiber entanglement caused by the breakage of the fibers to a certain degree disappears due to the too high needling density.
The low-needling density superfine fiber non-woven fabric skeleton structure of the low-density substrate layer has the needling density of 550-900 needles/cm < 2 >; the low-density substrate layer is used as a surface to prevent abrasion, so that the invention does not want fibers to be broken more due to excessive needling, so that the control of needling density is less, the low-density substrate layer and the high-density substrate layer are combined by means of needling, the fibers laid on the upper layer are brought into the lower layer by the needles, after the needling is completed, the fibers in the low-needling-density ultrafine fiber non-woven fabric skeleton structure penetrate through the fiber tissue structure in the high-needling-density ultrafine fiber non-woven fabric skeleton structure, namely, the needling density cannot be too low, otherwise, the fibers in the low-density substrate layer and the fibers in the high-density substrate layer are too little entangled, and the fibers in the low-density substrate layer cannot be firmly rooted in the high-density substrate layer.
Compared with the conventional single-layer substrate layer with the same needling density, the low-density substrate layer has higher rubbing fastness, because the fibers in the low-density substrate layer penetrate through the high-density substrate layer in a needling manner, which results in that the fibers in the low-density substrate layer simultaneously penetrate through the high-density substrate layer, in the high-density substrate layer, because the fibers are distributed more closely, polyurethane can form an effective continuous distribution structure during impregnation, and the fibers are entangled more, so that the fibers in the low-density substrate layer are favorably and firmly fixed in a composite structure consisting of a fiber framework and a polyurethane continuous phase in the high-density substrate layer. Therefore, although the same fiber does not form a firm composite structure in the low-density substrate layer, the fiber is firmly rooted in the composite structure in the high-density substrate layer, and therefore the low-density substrate layer of the suede microfiber leather provided by the invention is remarkably improved in wear resistance compared with the substrate layer with the same needling density.
Compared with the conventional single-layer high-needling-density substrate layer, the low-density substrate layer of the present invention also has higher friction fastness, because the low-density substrate layer has lower needling density and thus does not cause serious fiber breakage, and because the fibers in the low-density substrate layer are inserted into the high-density substrate layer and are firmly rooted in the high-density substrate layer by the continuous phase coating of polyurethane, the low-density substrate layer has higher friction fastness, while the conventional single-layer high-needling-density substrate layer generally has higher fiber breakage rate, which is a negative influence factor causing the reduction of the friction fastness.
As a preferred technical scheme:
the thickness of the high-density base layer of the waterborne polyurethane suede microfiber leather is 0.6-1.4mm.
The needling density of the high needling density superfine fiber non-woven fabric skeleton structure of the waterborne polyurethane suede superfine fiber leather is 3800-4500 needles/cm 2 。
According to the waterborne polyurethane suede microfiber leather, the abrasion loss of the waterborne polyurethane suede microfiber leather is 5-15mg after 35000 times of testing according to GB/T21196.2-2007 standard.
The invention also provides a preparation method of the waterborne polyurethane suede microfiber leather, which comprises the following steps:
(1) Preparing composite sea-island fiber non-woven fabric;
the composite sea-island fiber non-woven fabric consists of a sea-island fiber non-woven fabric layer with low needling density and a sea-island fiber non-woven fabric layer with high needling density, wherein the sea-island fibers in the sea-island fiber non-woven fabric layer with low needling density penetrate through the sea-island fiber non-woven fabric layer with high needling density;
the needling density of the sea-island fiber non-woven fabric layer with low needling density is 550-900 needles/cm 2 The thickness is 0.4-0.7mm; the needle punching density of the sea-island fiber non-woven fabric layer with high needle punching density is 3000-4500 needles/cm 2 The thickness is 1.2-2.1mm;
(2) Impregnating the composite sea-island fiber non-woven fabric with an aqueous polyurethane resin impregnation solution;
(3) Curing the product obtained in the step (2) to obtain the composite sea-island fiber base cloth;
(4) Performing decrement fiber opening on the composite sea-island fiber base cloth obtained in the step (3), namely dissolving sea phases in the sea-island fibers by adopting a solvent to obtain composite superfine fiber base cloth;
(5) And (3) carrying out skin grinding and raising on one side with lower needling density in the composite superfine fiber base cloth to prepare the waterborne polyurethane suede superfine fiber leather.
As a preferred technical scheme:
the preparation method of the waterborne polyurethane suede microfiber leather comprises the following steps of (1): firstly, laying sea-island fibers, carrying out primary needling to obtain a non-woven fabric blank, then laying the sea-island fibers above the non-woven fabric blank, and carrying out secondary needling to obtain a composite sea-island fiber non-woven fabric;
or, in the step (1), the preparation process of the composite sea-island fiber non-woven fabric is as follows: firstly, laying sea-island fibers, carrying out primary needling to prepare two non-woven fabric blanks with the same size specification, material and needling density, then sequentially laying the sea-island fibers and the other non-woven fabric blank above one non-woven fabric blank, carrying out secondary needling to prepare a composite non-woven fabric blank, and finally splitting the composite non-woven fabric blank from a middle sheet to obtain two pieces of composite sea-island fiber non-woven fabrics;
or, in the step (1), the preparation process of the composite sea-island fiber non-woven fabric is as follows: firstly, laying sea-island fibers, carrying out primary needling to obtain a non-woven fabric blank, then respectively laying a layer of equal non-woven fabric layer on the upper surface and the lower surface of the non-woven fabric blank, carrying out secondary needling to obtain a composite non-woven fabric blank, and finally splitting the composite non-woven fabric blank from a middle sheet to obtain two pieces of composite sea-island fiber non-woven fabrics;
the needling density of the secondary needling is the same as that of the sea-island fiber non-woven fabric layer with the low needling density, and the sum of the needling densities of the primary needling and the secondary needling is the same as that of the sea-island fiber non-woven fabric layer with the high needling density;
the technical scheme of purchasing a non-woven fabric blank with the same needling density and the same size and specification model as the non-woven fabric blank obtained by the primary needling in the step (1) of the invention and then performing the secondary needling to obtain the composite sea-island fiber non-woven fabric is regarded as the technical scheme which is the same as the technical scheme of the invention.
According to the preparation method of the waterborne polyurethane suede microfiber leather, the mass ratio of the sea component to the island component in all the sea-island fibers is 50-20; the diameters of all the sea-island fibers are controlled to be 17-30 mu m; all sea-island fibers are usually subjected to opening, carding and the like prior to needling, and these treatments are conventional treatments, as can be seen in Qu Jianbo, chapter iii of synthetic leather technology, nonwoven processing technology.
According to the preparation method of the waterborne polyurethane suede microfiber leather, in the step (2), the concentration of the waterborne polyurethane resin impregnation solution is 15-40wt%.
In the preparation method of the waterborne polyurethane suede microfiber leather, in the step (4), the content of the waterborne polyurethane resin in the composite microfiber base cloth is 24-40wt%; if the content of the aqueous polyurethane resin is less than 24wt%, the aqueous polyurethane resin cannot form an effective continuous phase in the high-needling-density superfine fiber non-woven fabric skeleton structure; if the content of the aqueous polyurethane resin is higher than 40wt%, over-impregnation can occur to cause stiff hand feeling of the microfiber base cloth, namely the invention expects to achieve sufficient polyurethane wrapping to obtain high wear resistance, surface fibers are not easy to lint, but does not expect excessive polyurethane to fill gaps, so that the hand feeling of the microfiber base cloth is hardened; the present invention is expected to have a more sufficient resin coating degree in the direction close to the base layer and a small resin coating degree in the direction close to the pile layer, so that the surface feel is softer.
The preparation method of the waterborne polyurethane suede microfiber leather comprises the steps that the curing process in the step (3), the fiber reducing and opening process in the step (4) and the skin grinding and raising process in the step (5) are all conventional processes, and the curing process is a process of forming the sea-island fiber base fabric by curing after moisture in the waterborne polyurethane resin impregnation liquid is extracted, and can be set to 90-145 ℃ for 10-30min; the process of reducing and opening the fiber is the process of drawing out the sea phases in the sea-island fiber to form the superfine fiber base cloth; in the process of polishing and raising, the surface of the base cloth is generally polished by sand paper to form a textured surface; the technologies of curing, weight reduction, fiber opening, and skin grinding and raising can be referred to Qu Jianbo, chapter iv base cloth processing technology of synthetic leather technology, chapter v weight reduction technology, and chapter v base cloth post-processing technology, respectively.
Has the beneficial effects that:
the waterborne polyurethane suede microfiber leather disclosed by the invention is good in friction resistance and comparable to microfiber base cloth prepared from solvent type polyurethane;
the preparation method of the waterborne polyurethane suede microfiber leather is simple.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
In the following examples and comparative examples, the abrasion loss of the aqueous polyurethane suede microfiber leather is measured by a martindale test, and the abrasion loss is measured at 35000 times according to the GB/T21196.2-2007 standard, and the suede layer of the aqueous polyurethane suede microfiber leather is used as the rubbed surface.
The sea-island fiber adopted by the invention is a conventional sea-island fiber, for example, conventional polyester PET, PBT, PTT and the like or conventional nylon PA6, PA66 and the like can be used as the island component, and also can be other materials suitable for preparing microfiber leather, the sea-island fibers used in the examples and the comparative examples of the invention are typical sea-island fibers which use PET as the island phase, COPET as the sea phase, the mass ratio of the sea component to the island component can be 50-20, the mass ratio of the sea component to the island component in the sea-island fibers used in the examples and the comparative examples of the invention is 30; the diameter of the sea-island fiber was controlled to 18 μm in both the examples and comparative examples of the present application; in the examples and comparative examples of the application, the aqueous polyurethane resin impregnation liquid is prepared by mixing aqueous polyurethane emulsion and water, wherein the aqueous polyurethane is purchased from Zhejiang Huafeng synthetic resin Co., ltd and is under the trade name JF-PDY-516HY.
Example 1
A preparation method of waterborne polyurethane suede microfiber leather comprises the following steps:
(1) Preparing composite sea-island fiber non-woven fabric;
firstly, laying the sea-island fiber net with the laying thickness of 48mm and 2450 needles/cm 2 The needling density of the raw materials is carried out for one time to obtain a non-woven fabric blank, and then a sea-island fiber net is laid on the non-woven fabric blank, wherein the lapping thickness is 12mm and 550 needles/cm are used 2 Carrying out secondary needling on the two layers according to the needling density to obtain the composite sea-island fiber non-woven fabric;
the prepared composite sea-island fiber non-woven fabric has an upper layer of a low-needling density sea-island fiber non-woven fabric layer and a lower layer of a high-needling density sea-island fiber non-woven fabric layer, the sea-island fibers in the low-needling density sea-island fiber non-woven fabric layer penetrate through the high-needling density sea-island fiber non-woven fabric layer in a needling manner, and the needling density of the upper layer is 550 needles/cm 2 The needling density of the lower layer is 3000 needles/cm 2 (ii) a The thickness of the upper layer is 0.4mm, and the thickness of the lower layer is 1.2mm;
(2) Impregnating the composite sea-island fiber non-woven fabric with 40wt% of aqueous polyurethane resin impregnation liquid, and controlling the liquid carrying rate to be 100% so as to obtain a certain resin content;
(3) Curing the product obtained in the step (2) at 145 ℃ for 10min to obtain the composite sea-island fiber base cloth;
(4) Performing decrement fiber splitting on the composite sea-island fiber base cloth obtained in the step (3), namely dissolving sea phases in the sea-island fibers by adopting a solvent to obtain the composite superfine fiber base cloth with the content of the waterborne polyurethane resin being 40wt%;
(5) And (3) carrying out skin grinding and raising on one surface with lower needling density in the composite superfine fiber base cloth to prepare the waterborne polyurethane suede superfine fiber leather.
The finally prepared waterborne polyurethane suede microfiber leather consists of a suede layer and a substrate layer; the base layer consists of a low-density base layer and a high-density base layer, and the suede layer is a fluff structure formed by grinding and raising the surface of the low-density base layer, which is far away from the high-density base layer; the low-density substrate layer comprises a low-needling-density superfine fiber non-woven fabric framework structure and water-based polyurethane resin which is filled in the framework structure and is in a discontinuous dispersion state; the high-density substrate layer comprises a high-needling-density superfine fiber non-woven fabric skeleton structure and water-based polyurethane resin which is filled in the high-needling-density superfine fiber non-woven fabric skeleton structure and is in a continuous dispersion state; the fibers in the low-needling-density superfine fiber non-woven fabric framework structure penetrate through the high-needling-density superfine fiber non-woven fabric framework structure in a needling manner;
the thickness of the low-density basal layer is 0.2mm, and the thickness of the high-density basal layer is 0.6mm;
the skeleton structure of the substrate layer is derived from the initially prepared composite sea-island fiber nonwoven fabric, and therefore, the needling density of the composite sea-island fiber nonwoven fabric determines the needling density of the nonwoven fabric skeleton structure in the finally prepared substrate layer, i.e., the needling density of the low needling density ultrafine fiber nonwoven fabric skeleton structure is equal to the needling density of the upper layer of the composite sea-island fiber nonwoven fabric, and the needling density of the high needling density ultrafine fiber nonwoven fabric skeleton structure is equal to the needling density of the lower layer of the composite sea-island fiber nonwoven fabric.
The abrasion loss of the finally prepared waterborne polyurethane suede microfiber leather tested for 35000 times according to GB/T21196.2-2007 standard is 12mg.
Comparative example 1
A preparation method of waterborne polyurethane suede microfiber leather is basically the same as example 1, except that in the step (1), the once lapping thickness of the sea-island fiber net is 52mm, and 2500 needles/cm is used 2 The needling density of (A) is carried out for one time to obtain a non-woven fabric blank, the secondary lapping thickness of the sea-island fiber web is 10mm, and 500 needles/cm is adopted 2 Carrying out secondary needling on the two layers according to the needling density to prepare the composite sea-island fiber non-woven fabric;
the needling density of the upper layer of the prepared composite sea-island fiber non-woven fabric is 500 needles/cm 2 ；
The abrasion loss of the finally prepared waterborne polyurethane suede microfiber leather tested for 35000 times according to GB/T21196.2-2007 standard is 26mg.
Compared with the example 1, the abrasion loss of the aqueous polyurethane suede microfiber leather prepared in the comparative example 1 after 35000 times of testing according to the GB/T21196.2-2007 standard is 26mg and is larger than 12mg of the example 1, because the needling density of the sea island fiber net in the comparative example 1 is too small, the entanglement of the fibers in the low-density substrate layer and the fibers in the high-density substrate layer is too small, the fibers in the low-density substrate layer can not be firmly rooted in the high-density substrate layer, and the abrasion loss is increased.
Comparative example 2
A preparation method of waterborne polyurethane suede microfiber leather is basically the same as example 1, except that in the step (1), the once lapping thickness of the sea-island fiber net is 36mm, and 2000 needles/cm is adopted 2 The needling density of the fiber is carried out for one time to prepare a non-woven fabric blank, the secondary lapping thickness of the sea-island fiber web is 18mm, and 1000 needles/cm are used 2 Carrying out secondary needling on the two layers according to the needling density to prepare the composite sea-island fiber non-woven fabric;
the needling density of the upper layer of the prepared composite sea-island fiber non-woven fabric is 1000 needles/cm 2 ；
The abrasion loss of the finally prepared waterborne polyurethane suede microfiber leather is 29mg after 35000 times of testing according to GB/T21196.2-2007 standard.
Compared with the example 1, the abrasion loss of the aqueous polyurethane suede microfiber leather prepared in the comparative example 2 after 35000 times of test according to the GB/T21196.2-2007 standard is 29mg and is larger than 12mg of the leather prepared in the example 1, because the sea island fiber net in the comparative example 2 is too high in needling density, more fibers are broken in the needling process, and the abrasion loss is increased.
Comparative example 3
A preparation method of waterborne polyurethane suede microfiber leather is basically the same as example 1, except that in the step (1), the primary lapping thickness of the sea-island fiber net is 32mm, and 1950 needles/cm is adopted 2 Carrying out primary needling on the needle punching density to obtain a non-woven fabric blank;
the needling density of the lower layer of the prepared composite sea-island fiber non-woven fabric is 2500 needles/cm 2 ；
The abrasion loss of the finally prepared waterborne polyurethane suede microfiber leather tested for 35000 times according to GB/T21196.2-2007 standard is 30mg.
Compared with example 1, the abrasion loss of the aqueous polyurethane suede microfiber leather prepared in comparative example 3 after 35000 times of testing according to GB/T21196.2-2007 standard is 30mg and is larger than 12mg of example 1, because the tightness among fibers in comparative example 3 is low, and sufficient continuous polyurethane coating and fiber entanglement cannot be formed, so that the abrasion loss is increased.
Comparative example 4
A preparation method of waterborne polyurethane suede microfiber leather is basically the same as example 1, except that in the step (1), the once lapping thickness of the sea-island fiber net is 85mm, and 4450 needles/cm is adopted 2 Needle (2)Carrying out one-time needling on the needling density to obtain a non-woven fabric blank;
the needling density of the lower layer of the prepared composite sea-island fiber non-woven fabric is 5000 needles/cm 2 ；
The abrasion loss of the finally prepared waterborne polyurethane suede microfiber leather tested 35000 times according to GB/T21196.2-2007 standard is 38mg.
Compared with example 1, the abrasion loss of 35000 times of the aqueous polyurethane suede microfiber leather prepared in comparative example 4 according to GB/T21196.2-2007 standard is 38mg and is greater than 12mg of example 1, because the excessively high needling density in comparative example 4 can cause excessively severe fiber breakage, excessively low fiber entanglement and large abrasion loss.
Comparative example 5
A preparation method of waterborne polyurethane suede microfiber leather is basically the same as that in example 1, except that in the step (1), the once lapping thickness of a sea-island fiber net is 40mm;
the thickness of the lower layer of the prepared composite sea-island fiber non-woven fabric is 1.0mm;
the thickness of the high-density substrate layer of the finally prepared waterborne polyurethane suede microfiber leather is 0.5mm; the abrasion loss of the waterborne polyurethane suede microfiber leather tested by GB/T21196.2-2007 standard at 35000 times is 31mg.
Compared with the example 1, the abrasion loss of the aqueous polyurethane suede microfiber leather prepared in the comparative example 5 is 31mg and is larger than 12mg of the example 1 after 35000 times of testing according to the GB/T21196.2-2007 standard, because the one-time lapping thickness in the comparative example 5 is too low, the entanglement of the fibers in the low-needling-density ultrafine-fiber non-woven fabric framework structure layer in the high-needling-density ultrafine-fiber non-woven fabric framework structure layer is low, and the abrasion loss is increased.
Comparative example 6
The preparation method of the waterborne polyurethane suede microfiber leather is basically the same as that in example 1, except that in the step (1), the secondary lapping thickness of the sea-island fiber net is 24mm;
the thickness of the upper layer of the prepared composite sea-island fiber non-woven fabric is 0.9mm;
the thickness of the low-density substrate layer of the finally prepared waterborne polyurethane suede microfiber leather is 0.4mm; the abrasion loss of the waterborne polyurethane suede microfiber leather tested by GB/T21196.2-2007 standard at 35000 times is 32mg.
Compared with example 1, the abrasion loss of 35000 times of the aqueous polyurethane suede microfiber leather prepared in comparative example 6 according to GB/T21196.2-2007 standard is 32mg and is greater than 12mg of example 1, because the fibers in the low-density substrate layer and the fibers in the high-density substrate layer are too little entangled, and the fibers in the low-density substrate layer can not be firmly rooted in the high-density substrate layer, so that the abrasion loss is increased in comparative example 6.
Comparative example 7
A preparation method of waterborne polyurethane suede microfiber leather, which is basically the same as that in the example 1, and is characterized in that in the step (2), when the composite sea-island fiber non-woven fabric is impregnated by waterborne polyurethane resin impregnation liquid, the liquid carrying rate is controlled to be 50% so as to control and obtain a certain resin content; in the step (4), a solvent is adopted to dissolve and remove sea phases in the sea-island fibers to obtain the composite superfine fiber base cloth with the content of the aqueous polyurethane resin of 20 wt%;
the abrasion loss of the finally prepared waterborne polyurethane suede microfiber leather tested for 35000 times according to GB/T21196.2-2007 standard is 33mg.
Compared with example 1, the abrasion loss of the aqueous polyurethane suede microfiber leather prepared in comparative example 7 after 35000 times of testing according to GB/T21196.2-2007 standard is 33mg and is larger than 12mg of example 1, because the resin content of the composite sea-island fiber non-woven fabric of comparative example 7 is too low, sufficient continuous polyurethane coating and fiber entanglement are difficult to form, and the abrasion loss is increased.
Example 2
A preparation method of waterborne polyurethane suede microfiber leather comprises the following steps:
(1) Preparing composite sea-island fiber non-woven fabric;
firstly, laying the sea island fiber net with the laying thickness of 65mm and the laying depth of 3180 needles/cm 2 The non-woven fabric blank is prepared by one-time needling according to the needling density, and then the non-woven fabric blank is paved above the non-woven fabric blankSetting sea-island fiber net with laying thickness of 16mm and 620 needles/cm 2 Carrying out secondary needling on the two layers according to the needling density to obtain the composite sea-island fiber non-woven fabric;
the prepared composite sea-island fiber non-woven fabric has an upper layer of sea-island fiber non-woven fabric layer with low needling density, a lower layer of sea-island fiber non-woven fabric layer with high needling density, the sea-island fibers in the sea-island fiber non-woven fabric layer with low needling density penetrate the sea-island fiber non-woven fabric layer with high needling density, and the needling density of the upper layer is 620 needles/cm 2 The needling density of the lower layer is 3800 needles/cm 2 (ii) a The thickness of the upper layer is 0.45mm, and the thickness of the lower layer is 1.4mm;
(2) Impregnating the composite sea-island fiber non-woven fabric with aqueous polyurethane resin impregnation liquid with the concentration of 34wt%, and controlling the liquid carrying rate to be 103% so as to control and obtain a certain resin content;
(3) Curing the product obtained in the step (2) at 135 ℃ for 12min to obtain the composite sea-island fiber base fabric;
(4) Performing decrement fiber splitting on the composite sea-island fiber base cloth obtained in the step (3), namely dissolving sea phases in the sea-island fibers by adopting a solvent to obtain the composite superfine fiber base cloth with the content of the aqueous polyurethane resin of 35 wt%;
(5) And (3) carrying out skin grinding and raising on one surface with lower needling density in the composite superfine fiber base cloth to prepare the waterborne polyurethane suede superfine fiber leather.
The finally prepared waterborne polyurethane suede microfiber leather consists of a suede layer and a substrate layer; the base layer consists of a low-density base layer and a high-density base layer, and the suede layer is a fluff structure formed by grinding and raising the surface of the low-density base layer, which is far away from the high-density base layer; the low-density substrate layer comprises a low-needling-density superfine fiber non-woven fabric framework structure and water-based polyurethane resin which is filled in the framework structure and is in a discontinuous dispersion state; the high-density substrate layer comprises a high-needling-density superfine fiber non-woven fabric skeleton structure and continuous dispersed aqueous polyurethane resin filled in the skeleton structure; fibers in the low-needling-density superfine fiber non-woven fabric skeleton structure penetrate through the high-needling-density superfine fiber non-woven fabric skeleton structure in a needling manner;
the thickness of the low-density basal layer is 0.24mm, and the thickness of the high-density basal layer is 0.8mm;
the skeleton structure of the substrate layer is derived from the initially prepared composite sea-island fiber nonwoven fabric, and therefore, the needling density of the composite sea-island fiber nonwoven fabric determines the needling density of the nonwoven fabric skeleton structure in the finally prepared substrate layer, i.e., the needling density of the low needling density ultrafine fiber nonwoven fabric skeleton structure is equal to that of the upper layer of the composite sea-island fiber nonwoven fabric, and the needling density of the high needling density ultrafine fiber nonwoven fabric skeleton structure is equal to that of the lower layer of the composite sea-island fiber nonwoven fabric.
The abrasion loss of the finally prepared waterborne polyurethane suede microfiber leather tested 35000 times according to GB/T21196.2-2007 standard is 9mg.
Example 3
A preparation method of waterborne polyurethane suede microfiber leather comprises the following steps:
(1) Preparing composite sea-island fiber non-woven fabric;
firstly, laying the sea island fiber net with the laying thickness of 75mm and the laying depth of 3215 needles/cm 2 The needling density of the fiber is carried out for one time to prepare a non-woven fabric blank, and then a sea-island fiber net is laid above the non-woven fabric blank, wherein the laying thickness is 18mm and 785 needles/cm 2 Carrying out secondary needling on the two layers according to the needling density to obtain the composite sea-island fiber non-woven fabric;
the prepared composite sea-island fiber non-woven fabric has an upper layer of a low-needling density sea-island fiber non-woven fabric layer and a lower layer of a high-needling density sea-island fiber non-woven fabric layer, the sea-island fibers in the low-needling density sea-island fiber non-woven fabric layer penetrate through the high-needling density sea-island fiber non-woven fabric layer in a needling manner, and the needling density of the upper layer is 785 needles/cm 2 The needling density of the lower layer is 4000 needles/cm 2 (ii) a The thickness of the upper layer is 0.5mm, and the thickness of the lower layer is 1.6mm;
(2) Adopting 29wt% aqueous polyurethane resin impregnation liquid to impregnate the composite sea-island fiber non-woven fabric, and controlling the liquid carrying rate to be 107% so as to control and obtain a certain resin content;
(3) Curing the product obtained in the step (2) at 118 ℃ for 23min to obtain the composite sea-island fiber base fabric;
(4) Performing decrement fiber splitting on the composite sea-island fiber base cloth obtained in the step (3), namely dissolving sea phases in the sea-island fibers by adopting a solvent to obtain the composite superfine fiber base cloth with 31wt% of aqueous polyurethane resin;
(5) And (3) carrying out skin grinding and raising on one surface with lower needling density in the composite superfine fiber base cloth to prepare the waterborne polyurethane suede superfine fiber leather.
The finally prepared waterborne polyurethane suede microfiber leather consists of a suede layer and a substrate layer; the base layer consists of a low-density base layer and a high-density base layer, and the suede layer is a fluff structure formed by grinding and raising the surface of the low-density base layer, which is far away from the high-density base layer; the low-density substrate layer comprises a low-needling-density superfine fiber non-woven fabric framework structure and water-based polyurethane resin which is filled in the framework structure and is in a discontinuous dispersion state; the high-density substrate layer comprises a high-needling-density superfine fiber non-woven fabric skeleton structure and water-based polyurethane resin which is filled in the high-needling-density superfine fiber non-woven fabric skeleton structure and is in a continuous dispersion state; fibers in the low-needling-density superfine fiber non-woven fabric skeleton structure penetrate through the high-needling-density superfine fiber non-woven fabric skeleton structure in a needling manner;
the thickness of the low-density basal layer is 0.26mm, and the thickness of the high-density basal layer is 1mm;
the skeleton structure of the substrate layer is derived from the initially prepared composite sea-island fiber nonwoven fabric, and therefore, the needling density of the composite sea-island fiber nonwoven fabric determines the needling density of the nonwoven fabric skeleton structure in the finally prepared substrate layer, i.e., the needling density of the low needling density ultrafine fiber nonwoven fabric skeleton structure is equal to the needling density of the upper layer of the composite sea-island fiber nonwoven fabric, and the needling density of the high needling density ultrafine fiber nonwoven fabric skeleton structure is equal to the needling density of the lower layer of the composite sea-island fiber nonwoven fabric.
The abrasion loss of the finally prepared waterborne polyurethane suede microfiber leather tested 35000 times according to GB/T21196.2-2007 standard is 5mg.
Example 4
A preparation method of waterborne polyurethane suede microfiber leather comprises the following steps:
(1) Preparing composite sea-island fiber non-woven fabric;
firstly, laying the sea-island fiber net with the thickness of 90mm and the needle/cm ratio of 3360 2 The needling density of the fiber is carried out for one time to obtain a non-woven fabric blank, and then a sea-island fiber net is laid above the non-woven fabric blank, wherein the lapping thickness is 20mm and 840 needles/cm are used 2 Performing secondary needling on the two layers to obtain the composite sea-island fiber non-woven fabric;
the upper layer of the prepared composite sea-island fiber non-woven fabric is a low-needling density sea-island fiber non-woven fabric layer, the lower layer is a high-needling density sea-island fiber non-woven fabric layer, the sea-island fibers in the low-needling density sea-island fiber non-woven fabric layer penetrate through the high-needling density sea-island fiber non-woven fabric layer in a needling manner, and the needling density of the upper layer is 840 needles/cm 2 The needling density of the lower layer is 4200 needles/cm 2 (ii) a The thickness of the upper layer is 0.62mm, and the thickness of the lower layer is 1.8mm;
(2) Impregnating the composite sea-island fiber non-woven fabric with 22wt% of aqueous polyurethane resin impregnation liquid, and controlling the liquid carrying rate to be 119% so as to control and obtain a certain resin content;
(3) Curing the product obtained in the step (2) at 100 ℃ for 26min to obtain the composite sea-island fiber base fabric;
(4) Performing decrement fiber splitting on the composite sea-island fiber base cloth obtained in the step (3), namely dissolving sea phases in the sea-island fibers by adopting a solvent to obtain the composite superfine fiber base cloth with the content of the waterborne polyurethane resin of 26 wt%;
(5) And (3) carrying out skin grinding and raising on one surface with lower needling density in the composite superfine fiber base cloth to prepare the waterborne polyurethane suede superfine fiber leather.
The finally prepared waterborne polyurethane suede microfiber leather consists of a suede layer and a substrate layer; the base layer consists of a low-density base layer and a high-density base layer, and the suede layer is a fluff structure formed by grinding and raising the surface of the low-density base layer, which is far away from the high-density base layer; the low-density substrate layer comprises a low-needling-density superfine fiber non-woven fabric framework structure and water-based polyurethane resin which is filled in the framework structure and is in a discontinuous dispersion state; the high-density substrate layer comprises a high-needling-density superfine fiber non-woven fabric skeleton structure and water-based polyurethane resin which is filled in the high-needling-density superfine fiber non-woven fabric skeleton structure and is in a continuous dispersion state; the fibers in the low-needling-density superfine fiber non-woven fabric framework structure penetrate through the high-needling-density superfine fiber non-woven fabric framework structure in a needling manner;
the thickness of the low-density basal layer is 0.27mm, and the thickness of the high-density basal layer is 1.2mm;
the skeleton structure of the substrate layer is derived from the initially prepared composite sea-island fiber nonwoven fabric, and therefore, the needling density of the composite sea-island fiber nonwoven fabric determines the needling density of the nonwoven fabric skeleton structure in the finally prepared substrate layer, i.e., the needling density of the low needling density ultrafine fiber nonwoven fabric skeleton structure is equal to that of the upper layer of the composite sea-island fiber nonwoven fabric, and the needling density of the high needling density ultrafine fiber nonwoven fabric skeleton structure is equal to that of the lower layer of the composite sea-island fiber nonwoven fabric.
The abrasion loss of the finally prepared waterborne polyurethane suede microfiber leather tested 35000 times according to GB/T21196.2-2007 standard is 7mg.
Example 5
A preparation method of waterborne polyurethane suede microfiber leather comprises the following steps:
(1) Preparing composite sea-island fiber non-woven fabric;
firstly, laying the sea-island fiber net with the laying thickness of 105mm and the laying depth of 3600 needles/cm 2 The needling density of the raw materials is carried out for one time to obtain a non-woven fabric blank, and then a sea-island fiber net is laid on the non-woven fabric blank, wherein the lapping thickness is 24mm and 900 needles/cm is adopted 2 Carrying out secondary needling on the two layers according to the needling density to obtain the composite sea-island fiber non-woven fabric;
the upper layer of the prepared composite sea-island fiber non-woven fabric is a low-needling density sea-island fiber non-woven fabric layer, the lower layer is a high-needling density sea-island fiber non-woven fabric layer, the sea-island fibers in the low-needling density sea-island fiber non-woven fabric layer penetrate through the high-needling density sea-island fiber non-woven fabric layer in a needling manner, and the needling density of the upper layer is 900 needles/cm 2 The needling density of the lower layer was 4500 needles/cm 2 (ii) a The thickness of the upper layer is 0.7mm, and the thickness of the lower layerThe degree is 2.1mm;
(2) Impregnating the composite sea-island fiber non-woven fabric with 15wt% of aqueous polyurethane resin impregnation liquid, and controlling the liquid carrying rate to be 160% so as to control and obtain a certain resin content;
(3) Curing the product obtained in the step (2) at the curing temperature of 90 ℃ for 30min to obtain the composite sea-island fiber base fabric;
(4) Performing decrement fiber splitting on the composite sea-island fiber base cloth obtained in the step (3), namely dissolving sea phases in the sea-island fibers by adopting a solvent to obtain the composite superfine fiber base cloth with the content of the waterborne polyurethane resin being 24 wt%;
(5) And (3) carrying out skin grinding and raising on one surface with lower needling density in the composite superfine fiber base cloth to prepare the waterborne polyurethane suede superfine fiber leather.
The finally prepared waterborne polyurethane suede microfiber leather consists of a suede layer and a substrate layer; the base layer consists of a low-density base layer and a high-density base layer, and the suede layer is a fluff structure formed by buffing and raising the surface of the low-density base layer, which is away from the high-density base layer; the low-density substrate layer comprises a low-needling-density superfine fiber non-woven fabric skeleton structure and water-based polyurethane resin which is filled in the skeleton structure and is in a discontinuous dispersion state; the high-density substrate layer comprises a high-needling-density superfine fiber non-woven fabric skeleton structure and water-based polyurethane resin which is filled in the high-needling-density superfine fiber non-woven fabric skeleton structure and is in a continuous dispersion state; fibers in the low-needling-density superfine fiber non-woven fabric skeleton structure penetrate through the high-needling-density superfine fiber non-woven fabric skeleton structure in a needling manner;
the thickness of the low-density basal layer is 0.3mm, and the thickness of the high-density basal layer is 1.4mm;
the skeleton structure of the substrate layer is derived from the initially prepared composite sea-island fiber nonwoven fabric, and therefore, the needling density of the composite sea-island fiber nonwoven fabric determines the needling density of the nonwoven fabric skeleton structure in the finally prepared substrate layer, i.e., the needling density of the low needling density ultrafine fiber nonwoven fabric skeleton structure is equal to the needling density of the upper layer of the composite sea-island fiber nonwoven fabric, and the needling density of the high needling density ultrafine fiber nonwoven fabric skeleton structure is equal to the needling density of the lower layer of the composite sea-island fiber nonwoven fabric.
The abrasion loss of the finally prepared waterborne polyurethane suede microfiber leather tested for 35000 times according to GB/T21196.2-2007 standard is 14mg.
Comparative example 8
A preparation method of waterborne polyurethane suede microfiber leather, which is basically the same as that in the example 5, and is characterized in that in the step (2), when the composite sea-island fiber non-woven fabric is impregnated with a waterborne polyurethane resin impregnation solution, the liquid carrying rate is controlled to be 120% so as to control and obtain a certain resin content; in the step (4), dissolving and removing the sea phase in the sea-island fiber by adopting a solvent to obtain the composite superfine fiber base cloth with the content of the aqueous polyurethane resin of 18 wt%;
the abrasion loss of the finally prepared waterborne polyurethane suede microfiber leather tested 35000 times according to GB/T21196.2-2007 standard is 35mg.
Compared with example 5, the abrasion loss of the aqueous polyurethane suede microfiber leather prepared in comparative example 8 is 35mg and is larger than 14mg of example 5 after 35000 times of tests according to GB/T21196.2-2007 standard, because the resin content of the composite sea-island fiber non-woven fabric of comparative example 8 is too small, sufficient continuous polyurethane coating and fiber entanglement are difficult to form, and the abrasion loss is increased.
Claims (10)
1. The waterborne polyurethane suede microfiber leather comprises a suede layer and a substrate layer, and is characterized in that:
the base layer consists of a low-density base layer and a high-density base layer, and the suede layer is a fluff structure formed by grinding and raising the surface of the low-density base layer, which is far away from the high-density base layer;
the low-density substrate layer comprises a low-needling-density superfine fiber non-woven fabric framework structure and water-based polyurethane resin which is filled in the framework structure and is in a discontinuous dispersion state; the high-density substrate layer comprises a high-needling-density superfine fiber non-woven fabric skeleton structure and water-based polyurethane resin which is filled in the high-needling-density superfine fiber non-woven fabric skeleton structure and is in a continuous dispersion state;
fibers in the low-needling-density superfine fiber non-woven fabric skeleton structure penetrate through the high-needling-density superfine fiber non-woven fabric skeleton structure in a needling manner;
low densityThe thickness of the basal layer is 0.2-0.3mm, and the thickness of the high-density basal layer is more than 0.6mm; the needling density of the low needling density superfine fiber non-woven fabric skeleton structure is 550-900 needles/cm 2 The needle punching density of the high needle punching density superfine fiber non-woven fabric skeleton structure is 3000-4500 needles/cm 2 。
2. The waterborne polyurethane suede microfiber leather of claim 1, wherein the thickness of the high density base layer is 0.6-1.4mm.
3. The waterborne polyurethane suede microfiber leather of claim 1, wherein the needle punching density of the high needle punching density microfiber nonwoven fabric skeleton structure is 3800-4500 needles/cm 2 。
4. The waterborne polyurethane suede microfiber leather of claim 1, wherein the abrasion loss of the waterborne polyurethane suede microfiber leather is 5-15mg after 35000 times of testing according to GB/T21196.2-2007 standard.
5. A preparation method of waterborne polyurethane suede microfiber leather is characterized by comprising the following steps:
(1) Preparing composite sea-island fiber non-woven fabric;
the composite sea-island fiber non-woven fabric consists of a sea-island fiber non-woven fabric layer with low needling density and a sea-island fiber non-woven fabric layer with high needling density, wherein the sea-island fibers in the sea-island fiber non-woven fabric layer with low needling density penetrate through the sea-island fiber non-woven fabric layer with high needling density;
the needling density of the sea-island fiber non-woven fabric layer with low needling density is 550-900 needles/cm 2 The thickness is 0.4-0.7mm; the needle punching density of the sea-island fiber non-woven fabric layer with high needle punching density is 3000-4500 needles/cm 2 The thickness is 1.2-2.1mm;
(2) Impregnating the composite sea-island fiber non-woven fabric with an aqueous polyurethane resin impregnation solution;
(3) Curing the product obtained in the step (2) to obtain the composite sea-island fiber base cloth;
(4) Performing decrement fiber opening on the composite sea-island fiber base cloth obtained in the step (3), namely dissolving sea phases in the sea-island fibers by adopting a solvent to obtain composite superfine fiber base cloth;
(5) And (3) carrying out skin grinding and raising on one surface with lower needling density in the composite superfine fiber base cloth to prepare the waterborne polyurethane suede superfine fiber leather.
6. The method for preparing the waterborne polyurethane suede microfiber leather according to claim 5, wherein in the step (1), the composite sea-island fiber non-woven fabric is prepared by the following steps: firstly, laying sea-island fibers, carrying out primary needling to obtain a non-woven fabric blank, then laying the sea-island fibers above the non-woven fabric blank, and carrying out secondary needling to obtain a composite sea-island fiber non-woven fabric;
the needling density of the secondary needling is equal to that of the sea-island fiber non-woven fabric layer with low needling density, and the sum of the needling densities of the primary needling and the secondary needling is equal to that of the sea-island fiber non-woven fabric layer with high needling density.
7. The method for preparing the waterborne polyurethane suede microfiber leather of claim 5, wherein in the step (1), the composite sea-island fiber non-woven fabric is prepared by the following steps: firstly, laying sea-island fibers, carrying out primary needling to prepare two non-woven fabric blanks with the same size specification, material and needling density, then laying the sea-island fibers and the other non-woven fabric blank above one non-woven fabric blank in sequence, carrying out secondary needling to prepare a composite non-woven fabric blank, and finally splitting the composite non-woven fabric blank from a middle sheet to obtain two composite sea-island fiber non-woven fabrics;
or, in the step (1), the preparation process of the composite sea-island fiber non-woven fabric is as follows: firstly, laying sea-island fibers, carrying out primary needling to obtain a non-woven fabric blank, then respectively laying a layer of equal non-woven fabric layer on the upper surface and the lower surface of the non-woven fabric blank, carrying out secondary needling to obtain a composite non-woven fabric blank, and finally splitting the composite non-woven fabric blank from a middle sheet to obtain two pieces of composite sea-island fiber non-woven fabrics;
the needling density of the secondary needling is equal to that of the sea-island fiber non-woven fabric layer with low needling density, and the sum of the needling densities of the primary needling and the secondary needling is equal to that of the sea-island fiber non-woven fabric layer with high needling density.
8. The preparation method of the waterborne polyurethane suede microfiber leather according to claim 6 or 7, wherein the mass ratio of sea components to island components in all the sea-island fibers is 50-20; the diameter of all the sea-island fibers is controlled to be 17-30 μm.
9. The method for preparing the waterborne polyurethane suede microfiber leather according to claim 5, wherein in the step (2), the concentration of the waterborne polyurethane resin impregnation solution is 15-40wt%.
10. The method for preparing the waterborne polyurethane suede microfiber leather of claim 5, wherein in the step (4), the content of the waterborne polyurethane resin in the composite microfiber base fabric is 24-40wt%.
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| CN112376284A (en) * | 2020-10-21 | 2021-02-19 | 广东齐力聚合材料有限公司 | Waterborne superfine fiber matte synthetic leather for sofa |
| US20220018061A1 (en) * | 2018-12-27 | 2022-01-20 | Kuraray Co., Ltd. | Napped artificial leather and method for producing the same |
| US20220333299A1 (en) * | 2019-09-10 | 2022-10-20 | Kuraray Co., Ltd. | Napped artificial leather |
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| JP2000212880A (en) * | 1999-01-13 | 2000-08-02 | Toray Ind Inc | Production of artificial leather having nap |
| CN102899917A (en) * | 2012-09-25 | 2013-01-30 | 禾欣可乐丽超纤皮(嘉兴)有限公司 | Manufacturing method of highly-bonded-leather superfine fiber synthesized leather |
| CN103114458A (en) * | 2013-01-24 | 2013-05-22 | 嘉兴学院 | Preparation method of high-density and high-physical-property suede superfine fiber artificial leathers |
| CN104328602A (en) * | 2014-12-02 | 2015-02-04 | 福建南纺股份有限公司 | Compound sea-island fiber synthetic leather base cloth and preparation method thereof |
| CN108951177A (en) * | 2017-05-18 | 2018-12-07 | 安安(中国)有限公司 | A kind of processing method of the suede superfine fiber synthetic leather with higher scratch resistance wear-resisting property |
| CN109154135A (en) * | 2018-02-05 | 2019-01-04 | 浙江梅盛新材料有限公司 | A kind of superfine fibre fabric and its manufacturing process |
| US20220018061A1 (en) * | 2018-12-27 | 2022-01-20 | Kuraray Co., Ltd. | Napped artificial leather and method for producing the same |
| US20220333299A1 (en) * | 2019-09-10 | 2022-10-20 | Kuraray Co., Ltd. | Napped artificial leather |
| CN112376284A (en) * | 2020-10-21 | 2021-02-19 | 广东齐力聚合材料有限公司 | Waterborne superfine fiber matte synthetic leather for sofa |
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