CN110924184A - Preparation method of weft-knitted suede super-imitation leather fabric - Google Patents

Preparation method of weft-knitted suede super-imitation leather fabric Download PDF

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CN110924184A
CN110924184A CN201911253025.1A CN201911253025A CN110924184A CN 110924184 A CN110924184 A CN 110924184A CN 201911253025 A CN201911253025 A CN 201911253025A CN 110924184 A CN110924184 A CN 110924184A
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super
leather
finished product
semi
weft
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仲泓天
张新杰
王卫锋
陆利国
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Jiangsu Poly Micro Fiber Technology Group Ltd By Share Ltd
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Jiangsu Poly Micro Fiber Technology Group Ltd By Share Ltd
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    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
    • D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
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    • D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
    • D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
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    • D06N3/0004—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using ultra-fine two-component fibres, e.g. island/sea, or ultra-fine one component fibres (< 1 denier)
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    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
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    • D06N3/0009—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using knitted fabrics
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    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
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    • D06N3/004—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using flocked webs or pile fabrics upon which a resin is applied; Teasing, raising web before resin application
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    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
    • D06N3/0075—Napping, teasing, raising or abrading of the resin coating
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    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
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    • D06N3/0077—Embossing; Pressing of the surface; Tumbling and crumbling; Cracking; Cooling; Heating, e.g. mirror finish
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    • D06N2211/00—Specially adapted uses
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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)

Abstract

The invention discloses a preparation method of a weft-knitted suede super-imitation leather fabric, which takes sea-island filament microfiber as a raw material, and weaves the raw material on a double-sided big circular knitting machine to obtain gray fabric, wherein the texture structure of the gray fabric is a interlock texture or an air layer texture, and the gray fabric is subjected to post-finishing process to obtain super-imitation leather base fabric; soaking the super leather-like base cloth in polyurethane slurry, rolling out redundant slurry, and solidifying to form polyurethane leather films on both sides of the super leather-like base cloth; and sequentially carrying out washing, drying, double-side sanding, dyeing, shaping, brushing and finished product shaping on the obtained super leather-like base cloth with the polyurethane film formed thereon to obtain a finished product. The weft-knitted suede super-imitation leather fabric is soft in hand feeling, excellent in rebound resilience and deformation resistance, rich and colorful in color, good in pilling resistance and capable of improving the practical application value in the fields of clothing and the like.

Description

Preparation method of weft-knitted suede super-imitation leather fabric
Technical Field
The invention relates to the technical field of manufacturing of super-imitation leather fabrics, in particular to a method for preparing a weft-knitted suede super-imitation leather fabric.
Background
With the continuous deterioration of ecological environment, countries in the world recognize the importance of protecting the environment and animals, and the use of artificial leather instead of animal dermis has become a trend. However, although artificial leathers have a certain degree of imitation of the appearance of genuine leathers, they have a certain difference in their elastic recovery and extensibility. The existing artificial leather can not simultaneously give consideration to the vivid imitation of appearance and performance.
At present, most of base fabrics of superfine fiber artificial leather are non-woven fabrics, and the three-dimensional network structure of the non-woven fabrics endows the non-woven fabrics with a collagen fiber structure similar to dermis. The base fabric is coated and calendered by polyurethane, so that the performances of the base fabric in the aspects of strength and shape retention are far superior to those of natural leather. The superfine fiber synthetic leather is a new generation of artificial leather, and is close to genuine leather in appearance, hand feeling and internal structure. But the non-woven microfiber leather has poor dyeing uniformity and color fastness, and napped fibers are easy to fall off and have poor pilling resistance. Moreover, since emphasis is placed on simulating the structure inherent in the animal skin, there are disadvantages in terms of appearance color, elasticity, resistance to deformation, and the like.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a preparation method of a weft-knitted suede super-imitation leather fabric, and the prepared weft-knitted suede super-imitation leather fabric is soft in hand feeling, excellent in rebound resilience and deformation resistance, rich and colorful in color, good in pilling resistance and high in practical application value in the fields of clothing and the like.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a preparation method of a weft-knitted suede super-imitation leather fabric comprises the following steps:
the method comprises the following steps: the sea island filament microfiber fiber is used as a raw material, a grey cloth is woven on a double-sided big circular knitting machine, the texture structure of the grey cloth is a interlock texture or an air layer texture, the grey cloth is processed by a post-finishing process, and the post-finishing process comprises the following steps: grey cloth → unwinding → fiber opening → sanding → wrinkling → dyeing → dehydration → drying → napping → sanding → sizing → inspection; obtaining super leather-like base cloth through a post-finishing process;
step two: soaking the super leather-like base cloth in polyurethane slurry, rolling out redundant slurry, then entering a coagulating tank, and treating by DMF (dimethyl formamide) aqueous solution in the coagulating tank to enable two sides of the super leather-like base cloth to form polyurethane leather films;
step three: washing and drying the super leather-like base cloth with the polyurethane leather film obtained in the step two in sequence to obtain a semi-finished product I;
step four: carrying out double-sided sanding on the semi-finished product I obtained in the step three through a sanding machine to obtain a semi-finished product II;
step five: treating the semi-finished product II obtained in the step four through a dyeing process to obtain a semi-finished product III;
step six: shaping the semi-finished product tee obtained in the fifth step through a shaping machine to obtain a semi-finished product fourth;
step seven: brushing the semi-finished four-way joint obtained in the sixth step by a brushing machine to obtain a semi-finished five-way joint;
step eight: and (5) shaping the semi-finished product V by a shaping machine, and obtaining a finished product after shaping.
Furthermore, in the first step of the method, the super leather-like base cloth is woven by using 88dtex/36F sea island low stretch yarn or 105D/36F sea island low stretch yarn as raw material on a double-sided circular knitting machine with 36 needles or 40 needles, and in the post-finishing process of the super leather-like base cloth, a liquid alkali high-temperature fiber opening process is adopted in the fiber opening process.
Further, the polyurethane slurry in the step two is prepared from the following raw materials in parts by mass:
Figure BDA0002309559050000031
further, the concentration of the DMF aqueous solution in the step two is 20-25%, the temperature of the coagulating bath is 20-30 ℃, and the speed of the super leather-like base cloth passing through the coagulating bath is 5-15 m/min.
Furthermore, in the washing process of the third step, the washing speed is 5-15 m/min, and the washing process is carried out at normal temperature.
Further, in the sanding process in the fourth step, one of 320-mesh sand paper, 400-mesh sand paper and 600-mesh sand paper is adopted to perform sanding treatment on the polyurethane films on the two sides of the super leather-like base cloth, so that the surface has a fluff effect, and the speed of a sanding machine is 2-5 m/min.
Further, the dyeing temperature in the dyeing process of the step five is 130 ℃, and the dyeing time is 60-90 min.
Further, the setting speed in the sixth step is 25m/min, the setting temperature is 160-180 ℃, and the setting treatment liquid adopted in the setting process contains 0.5-3% of a softening agent and 1-3% of a raising agent.
Further, the speed of the brushing process in the seventh step is 3-6 m/min.
Further, the shaping speed in the shaping process in the step eight is 25m/min, and the temperature is 160-180 ℃.
Compared with the prior art, the invention has the following advantages:
(1) in the selection of the base fabric, the weft-knitted fabric with the interlock texture or the air layer texture is adopted, the fabric is soft and comfortable in hand feeling, and after the treatment of the after-finishing process, the fluff is dense and fluffy, and the strength, elasticity and deformation resistance are higher than those of the nonwoven microfiber leather; moreover, the super leather-like base cloth is treated by a liquid alkali high-temperature fiber opening process in the post-finishing process, and the monofilament linear density of the base cloth is reduced under the action of liquid alkali high-temperature fiber opening, so that the specific surface area is increased, and the formation of fluff is facilitated;
(2) the base fabric of the invention adopts a weft knitting structure, so that the product has the advantages that the non-woven microfiber leather cannot be compared in the aspect of tear resistance, and meanwhile, the product has higher extensibility and wrinkle resistance;
(3) according to the preparation method, the polyurethane slurry is designed according to reasonable components and proportion, a polyurethane skin membrane is formed on the surface of the super leather-like base fabric, and after solidification, sanding treatment is carried out, so that the suede feeling as natural leather can be obtained, and the polyurethane slurry has good appearance effect and hand feeling; the sanded semi-finished product is dyed to obtain rich colors, and the dyeing uniformity and color fastness in the dyeing process are high; the dyed and shaped semi-finished product is subjected to brushing treatment, so that more comfortable and beautiful fluff can be obtained; in addition, through the matching of a series of processes of base fabric texture structure, base fabric after-finishing process, subsequent impregnation and solidification, water washing, drying, sanding, dyeing, shaping, brushing and finished product shaping, the final product has not only excellent appearance, but also excellent comprehensive performance, and the obtained fluff is not easy to fall off and has good pilling resistance;
(4) the preparation method of the weft-knitted suede super-imitation leather fabric provided by the invention is convenient to operate, low in production cost, superior to non-woven microfiber leather in price, and beneficial to wide application, and water and a DMF (dimethyl formamide) solvent used in production can be recycled, so that the recovery rate is high, and the environment is protected.
Drawings
Fig. 1 is a knitting diagram of an air layer structure of a gray fabric in the method for manufacturing a weft-knitted suede super-imitation leather fabric of the present invention.
Fig. 2 is a triangular arrangement view of an air layer structure of a gray fabric in the method for manufacturing a weft-knitted suede super-imitation leather fabric of the present invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings so that the advantages and features of the present invention will be readily understood by those skilled in the art, and the scope of the present invention will be clearly and clearly defined.
The preparation method of the weft-knitted suede super-imitation leather fabric provided by the embodiment of the invention comprises the following steps of:
step one, preparing base cloth: using 105D/36F sea-island composite filaments as raw materials, and knitting the raw materials on a 28-needle, 32-needle, 36-needle or 40-needle double-faced big circular knitting machine by adopting air layer tissues to obtain grey cloth; specifically, the knitting pattern of the weave structure of the fabric is shown in fig. 1, the knitting cam layout is shown in fig. 2, the air layer weave is knitted by a 6-way knitting system, in the 1 st-way knitting system and the 4 th-way knitting system, all dial needles are knitted, and cylinder needles do not participate in knitting; in the 2 nd and 5 th loop-forming systems, the dial needles do not participate in knitting, and the cylinder needles knit loops; in the 3 rd loop-forming system, low-heel needles in dial needles knit tuck, and low-heel needles in cylinder needles knit tuck; in the 6 th stitch forming system, the high-heel needles in the dial needles knit tucks, and the high-heel needles in the cylinder needles knit tucks.
The grey cloth obtained by weaving is processed by an after-finishing process, and the process of the after-finishing process comprises the following steps: grey cloth → unwinding → fiber opening → sanding → wrinkling → dyeing → dehydration → drying → napping → sanding → sizing → inspection; wherein, the fiber opening process adopts a liquid caustic soda high-temperature fiber opening process; and obtaining the super leather-like base cloth through an after-finishing process.
Step two, impregnation and curing: soaking the super leather-like base cloth in polyurethane slurry, rolling out redundant slurry, then entering a coagulating tank, and treating by DMF (dimethyl formamide) aqueous solution in the coagulating tank to form polyurethane leather films on both sides of the super leather-like base cloth;
the polyurethane slurry is prepared from the following raw materials in parts by weight:
Figure BDA0002309559050000061
wherein the concentration of the DMF aqueous solution is 20-25%, the temperature of the coagulating bath is 20-30 ℃, and the speed of the super leather-like base cloth passing through the coagulating bath is 5-15 m/min. The used DMF aqueous solution can be recycled, the recovery rate is high, and the environment is protected.
Step three, washing and drying: and D, sequentially washing the super leather-like base cloth with the polyurethane leather film obtained in the step two through eight washing tanks, wherein the concentration of DMF in the washing tank at the tail end is required to be close to 0%, the washing tank has a certain inclination angle, and the angle of the tail end is slightly higher, so that water can be recycled. The washing process is carried out at normal temperature, and the cloth feeding speed of the super leather-like base cloth with the polyurethane leather film is 5-15 m/min in the washing process; and (3) after washing, drying at the temperature of about 100 ℃ at the drying speed of 5-15 m/min. And washing and drying to obtain a semi-finished product I.
Step four, sanding: after drying, two sanding machines connected in a positive and negative mode are used, 320-mesh abrasive paper is used for sanding on two sides, the speed of each sanding machine is 2-5 m/min, polyurethane membranes on two sides of the super leather-like base cloth are sanded through a sanding process, and the surface is enabled to have a fluff effect. And (5) after sanding, obtaining a semi-finished product II.
Step five, dyeing, namely treating the semi-finished product II obtained in the step four through a dyeing process to obtain a semi-finished product III; the dyeing temperature in the dyeing process is 130 ℃, and the dyeing time is 60-90 min.
Step six, sizing: shaping the semi-finished product tee obtained in the fifth step through a shaping machine to obtain a semi-finished product fourth; wherein the setting speed is 25m/min, the setting temperature is 160-180 ℃, and the setting treatment liquid adopted in the setting process contains 0.5-3% of softening agent and 1-3% of raising agent.
Step seven, brushing the bristles: brushing the semi-finished four-way joint obtained in the sixth step by a brushing machine to obtain a semi-finished five-way joint; wherein the speed of the brushing process is 3-6 m/min
Step eight, shaping of finished products: shaping the semi-finished product V by a shaping machine to obtain a finished product; wherein the setting speed is 25m/min, and the temperature is 160-180 ℃.
The weft-knitted suede super-imitation leather fabric prepared by the method disclosed by the invention is soft in hand feeling, excellent in rebound resilience and deformation resistance, rich and colorful in color, good in pilling resistance, and wide in application, and the actual application value in the fields of clothing and the like is improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A preparation method of a weft-knitted suede super-imitation leather fabric is characterized by comprising the following steps:
the method comprises the following steps: the sea island filament microfiber fiber is used as a raw material, a grey cloth is woven on a double-sided big circular knitting machine, the texture structure of the grey cloth is a interlock texture or an air layer texture, the grey cloth is processed by a post-finishing process, and the post-finishing process comprises the following steps: grey cloth → unwinding → fiber opening → sanding → wrinkling → dyeing → dehydration → drying → napping → sanding → sizing → inspection; obtaining super leather-like base cloth through a post-finishing process;
step two: soaking the super leather-like base cloth in polyurethane slurry, rolling out redundant slurry, then entering a coagulating tank, and treating by DMF (dimethyl formamide) aqueous solution in the coagulating tank to enable two sides of the super leather-like base cloth to form polyurethane leather films;
step three: washing and drying the super leather-like base cloth with the polyurethane leather film obtained in the step two in sequence to obtain a semi-finished product I;
step four: carrying out double-sided sanding on the semi-finished product I obtained in the step three through a sanding machine to obtain a semi-finished product II;
step five: treating the semi-finished product II obtained in the step four through a dyeing process to obtain a semi-finished product III;
step six: shaping the semi-finished product tee obtained in the fifth step through a shaping machine to obtain a semi-finished product fourth;
step seven: brushing the semi-finished four-way joint obtained in the sixth step by a brushing machine to obtain a semi-finished five-way joint;
step eight: and (5) shaping the semi-finished product V by a shaping machine, and obtaining a finished product after shaping.
2. The method of claim 1, wherein the super suede fabric is prepared by weaving 88dtex/36F sea-island low stretch yarn or 105D/36F sea-island low stretch yarn as raw material on a 36-needle or 40-needle double-sided circular knitting machine, and in the post-finishing process of the super suede fabric, the fiber opening process is performed by liquid alkali high temperature fiber opening process.
3. The method for preparing a weft-knitted suede super-imitation leather fabric according to claim 1, wherein the polyurethane slurry is prepared from the following raw materials in parts by mass:
Figure FDA0002309559040000021
4. the method for preparing a weft-knitted suede super-imitation leather fabric according to claim 1, wherein the concentration of the DMF aqueous solution is 20-25%, the temperature of the coagulation bath is 20-30 ℃, and the speed of the super-imitation leather base fabric passing through the coagulation bath is 5-15 m/min.
5. The method for preparing a weft-knitted suede super-imitation leather fabric according to claim 1, wherein in the water washing process of the third step, the water washing speed is 5-15 m/min, and the water washing process is performed at normal temperature.
6. The method of claim 1, wherein the sanding process of the fourth step is one of 320-mesh sand paper, 400-mesh sand paper and 600-mesh sand paper, and the polyurethane films on both sides of the super leather-like base cloth are sanded, so that the surface has a nap effect, and the speed of the sanding machine is 2-5 m/min.
7. The method of claim 1, wherein the dyeing temperature in the dyeing process of step five is 130 ℃ and the dyeing time is 60-90 min.
8. The method for preparing a weft-knitted suede super-imitation leather fabric according to claim 1, wherein the setting speed in the sixth step is 25m/min, the setting temperature is 160-180 ℃, and the setting treatment liquid adopted in the setting process contains 0.5-3% of a softening agent and 1-3% of a fluffing agent.
9. The method for preparing a weft-knitted suede super-imitation leather fabric according to claim 1, wherein the brushing process in the seventh step is performed at a speed of 3-6 m/min.
10. The method of claim 1, wherein the setting speed of the setting process in the eighth step is 25m/min, and the temperature is 160-180 ℃.
CN201911253025.1A 2019-12-09 2019-12-09 Preparation method of weft-knitted suede super-imitation leather fabric Pending CN110924184A (en)

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