CN112501918B - Novel method for adjusting micropores of microfiber base cloth membrane by polyurethane wet method - Google Patents
Novel method for adjusting micropores of microfiber base cloth membrane by polyurethane wet method Download PDFInfo
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- CN112501918B CN112501918B CN202110030028.XA CN202110030028A CN112501918B CN 112501918 B CN112501918 B CN 112501918B CN 202110030028 A CN202110030028 A CN 202110030028A CN 112501918 B CN112501918 B CN 112501918B
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- microfiber
- woven fabric
- polyurethane
- base cloth
- toluene
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- 229920001410 Microfiber Polymers 0.000 title claims abstract description 65
- 239000003658 microfiber Substances 0.000 title claims abstract description 65
- 239000004744 fabric Substances 0.000 title claims abstract description 31
- 239000004814 polyurethane Substances 0.000 title claims abstract description 31
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000012528 membrane Substances 0.000 title claims abstract description 15
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims abstract description 78
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 42
- 238000001035 drying Methods 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 13
- 230000015271 coagulation Effects 0.000 claims abstract description 12
- 238000005345 coagulation Methods 0.000 claims abstract description 12
- 239000011259 mixed solution Substances 0.000 claims abstract description 10
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 59
- 239000000835 fiber Substances 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 238000007711 solidification Methods 0.000 abstract description 15
- 230000008023 solidification Effects 0.000 abstract description 15
- 239000011148 porous material Substances 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000001112 coagulating effect Effects 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 8
- 239000010410 layer Substances 0.000 description 4
- 239000002649 leather substitute Substances 0.000 description 3
- 229920006264 polyurethane film Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011527 polyurethane coating Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0043—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by their foraminous structure; Characteristics of the foamed layer or of cellular layers
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—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
- 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)
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—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
- D06N3/0011—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 non-woven fabrics
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- 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
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/12—Permeability or impermeability properties
- D06N2209/121—Permeability to gases, adsorption
- D06N2209/123—Breathable
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
Abstract
The invention discloses a novel method for adjusting micropores of a microfiber base cloth membrane by a polyurethane wet method, and belongs to the technical field of wet preparation of microfiber base cloth. The specific implementation mode is that the polyurethane slurry is coated on the microfiber non-woven fabric, then the microfiber non-woven fabric is put into a mixed solution coagulating bath of DMF/toluene for coagulation, and after the coagulation, the microfiber non-woven fabric is sent into a drawing tank for toluene decrement drawing; oiling and drying in a drying box to obtain the microfiber Beth base cloth with uniform film micropores. The invention regulates and controls the solidification speed and the pore structure of polyurethane through the difference of the mutual diffusion rate between the toluene and the DMF, thereby saving the use of the traditional solidification regulator and improving the micropore structure of the microfiber base cloth membrane; the purpose of reducing energy consumption is achieved.
Description
Technical Field
The invention belongs to the technical field of wet-process preparation of microfiber base cloth, and particularly relates to a novel method for adjusting micropores of a microfiber base cloth membrane by a polyurethane wet process.
Background
The microfiber synthetic leather is produced through dry facing or post finishing on the base cloth with microporous polyurethane coating, and the base cloth is produced with microfiber non-woven fabric, which is soaked with wet polyurethane slurry, and through coagulation, water washing, pumping, oiling, drying, etc. the base cloth has great influence on the microfiber synthetic leatherGel is finally precipitated to form a film, however, because the DMF is extracted from the slurry by water at a high speed, the surface solidification speed of the wet-process film is high, the further solidification of the inner layer of the polyurethane film is influenced, the surface and inner uniformity of the wet-process polyurethane film is poor, particularly the size and distribution difference of holes of the surface layer and the inner layer are large and small, the inner layer is a large and uneven finger-shaped hole, the smoothness of inner and outer layer pore canals is influenced, meanwhile, the large and uneven finger-shaped hole is easy to become a stress concentration point on the mechanical property and becomes the weakest link when stressed, so that the physical property of the synthetic leather is reduced, at present, although a solidification regulator is generally adopted to delay the solidification of the polyurethane wet-process film, the shape, the size and the distribution of polyurethane micropores can not be further regulated, therefore, in order to make an ideal uniformly distributed microporous structure of the polyurethane wet-process film, further technical improvements are needed, in addition to the conventional DMF/H2For an O coagulation bath system, the energy consumption for recycling DMF is high, the energy consumption for recycling DMF in the coagulation bath is reduced under the condition that the nation advocates economical economy, and the method has positive contribution to energy conservation and emission reduction.
Disclosure of Invention
The invention aims to provide a novel method for adjusting the micropores of a microfiber base cloth membrane by a polyurethane wet method, so as to solve the problem of uneven shape, size and distribution of the micropores of the microfiber synthetic leather membrane and simultaneously realize the reduction of DMF (dimethyl formamide) recovery energy consumption in a coagulating bath.
In order to achieve the purpose, the following technical scheme is provided:
a new method for adjusting the micropores of a microfiber base cloth membrane by a polyurethane wet method is characterized by comprising the following steps:
1) selecting a super-fiber non-woven fabric, and coating the polyurethane slurry on the super-fiber non-woven fabric;
2) putting the super-fiber non-woven fabric treated in the step 1) into a mixed solution of DMF (dimethyl formamide)/toluene for coagulation in a coagulation bath, and then sending the super-fiber non-woven fabric into a drawing tank for toluene reduction and drawing;
3) oiling the microfiber non-woven fabric processed in the step 2), and placing the microfiber non-woven fabric in a drying oven to be dried to obtain microfiber Beth base fabric with uniform membrane micropores.
Further, the solvent of the polyurethane slurry in the step 1) is DMF, the mass concentration of the polyurethane is between 5% and 30%, and the modulus of the polyurethane is between 20% and 250.
Further, the composition ratio of the DMF/toluene mixed solution in the step 2) is 30-95% of toluene in mass percent of the mixed solution.
Further, the temperature of the coagulating bath in the step 2) is 20-60 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1) when the microfiber non-woven fabric coated with the polyurethane slurry is immersed in DMF/toluene solidification liquid for solidification, the DMF in the polyurethane slurry is gradually replaced by the toluene in the solidification liquid, and the solidification speed and the pore structure of the polyurethane are regulated and controlled through the difference of the mutual diffusion rates of the toluene and the DMF, so that the use of the traditional solidification regulator is saved, and the micropore structure of a microfiber base fabric membrane is improved;
2) compared with the conventional DMF/H2DMF and H in O coagulation bath2And O is separated, and the DMF and the toluene in the DMF/toluene coagulation bath are separated, so that the energy consumption is further saved.
Drawings
FIG. 1 is a SEM image of a cross-section of a microfiber Besse base cloth prepared by example 1;
FIG. 2 is a SEM image of a cross-section of a microfiber Besse base cloth prepared by example 2;
FIG. 3 is a SEM image of a cross-section of a microfiber Besse base cloth prepared by example 3;
FIG. 4 is a SEM image of a cross-section of a microfiber Besse base cloth prepared by example 4.
Detailed Description
The invention will be further described with reference to the following examples and the accompanying drawings, but the scope of the invention is not limited thereto.
Example 1
Selecting a PA6/PE sea-island type microfiber non-woven fabric block with the thickness of 1.0mm, coating polyurethane slurry with the mass concentration of 15% and the modulus of 60 on the microfiber non-woven fabric, then completely solidifying the microfiber non-woven fabric block in a solidification bath of DMF/water with the DMF content of 40% at 45 ℃, sending the microfiber non-woven fabric block into a drawing tank for toluene decrement drawing, then oiling the microfiber non-woven fabric block, and drying the microfiber non-woven fabric block in a drying box to obtain the final microfiber Bass fabric block, wherein the cross section SEM image of the microfiber Bessel fabric block is shown in figure 1, the micropore shape of a polyurethane film is observed, and the inner pore diameter and the outer pore diameter of the microfiber non-woven fabric block are finger-shaped pore structures with different sizes.
Example 2
Selecting a PA6/PE sea-island type microfiber non-woven fabric block with the thickness of 1.0mm, coating polyurethane slurry with the concentration of 5% and the modulus of 250 on the microfiber non-woven fabric block, completely solidifying the microfiber non-woven fabric block in a solidification bath of a DMF/toluene mixed solution with the toluene content of 30%, conveying the microfiber non-woven fabric block into a drawing tank for toluene decrement drawing, oiling the microfiber non-woven fabric block, and drying the microfiber non-woven fabric block in a drying box to obtain microfiber Bass fabric, wherein the cross section SEM image of the microfiber Bess fabric block is shown in figure 2, and the micropore shape of a membrane is observed and is of a uniform pore structure inside and outside.
Example 3
Selecting a PA6/PE sea-island type microfiber non-woven fabric block with the thickness of 1.5mm, coating polyurethane slurry with the concentration of 30% and the modulus of 20 on the microfiber non-woven fabric block, completely solidifying the microfiber non-woven fabric block in a solidification bath of a DMF (dimethyl formamide)/toluene mixed solution with the toluene content of 95%, conveying the microfiber non-woven fabric block into a drawing tank for toluene decrement drawing, oiling the microfiber non-woven fabric block, drying the microfiber non-woven fabric block in a drying box to obtain microfiber Bass fabric, wherein the cross section SEM image of the microfiber Bess fabric block is shown in figure 3, and the micropore shape of polyurethane is observed and has a uniform pore structure inside and outside.
Example 4
Selecting a PA6/PE sea-island type microfiber non-woven fabric block with the thickness of 0.8mm, coating polyurethane slurry with the concentration of 25% and the modulus of 100 on the microfiber non-woven fabric block, completely solidifying the microfiber non-woven fabric block in a solidification bath of a DMF/toluene mixed solution with the toluene content of 80%, conveying the microfiber non-woven fabric block into a drawing tank for toluene decrement drawing, oiling the microfiber non-woven fabric block, drying the microfiber non-woven fabric block in a drying box to obtain microfiber Bass fabric, observing the micropore shape of polyurethane to form a pore structure with uniform inside and outside, wherein the cross section SEM image of the microfiber Bass fabric block is shown in figure 4.
Claims (3)
1. A new method for adjusting the micropores of a microfiber base cloth membrane by a polyurethane wet method is characterized by comprising the following steps:
1) selecting a super-fiber non-woven fabric, and coating the polyurethane slurry on the super-fiber non-woven fabric;
2) putting the super-fiber non-woven fabric treated in the step 1) into a mixed solution of DMF (dimethyl formamide)/toluene for coagulation in a coagulation bath, and then sending the super-fiber non-woven fabric into a drawing tank for toluene reduction and drawing;
3) oiling the microfiber non-woven fabric treated in the step 2), and placing the microfiber non-woven fabric in a drying oven to be dried to obtain microfiber Beth base fabric with uniform membrane micropores;
the composition ratio of the DMF/toluene mixed solution in the step 2) is that toluene accounts for 30-95% of the mixed solution by mass.
2. The method for wet-regulating the micropores of the microfiber-based cloth membrane by using polyurethane according to claim 1, wherein the solvent of the polyurethane slurry in step 1) is DMF, and the mass concentration of polyurethane is between 5% and 30%.
3. The method for adjusting the micropores of the microfiber base cloth membrane by using the wet method of polyurethane according to claim 1, wherein the temperature of the coagulation bath in the step 2) is 20-60 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110030028.XA CN112501918B (en) | 2021-01-11 | 2021-01-11 | Novel method for adjusting micropores of microfiber base cloth membrane by polyurethane wet method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110030028.XA CN112501918B (en) | 2021-01-11 | 2021-01-11 | Novel method for adjusting micropores of microfiber base cloth membrane by polyurethane wet method |
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| Publication Number | Publication Date |
|---|---|
| CN112501918A CN112501918A (en) | 2021-03-16 |
| CN112501918B true CN112501918B (en) | 2022-06-24 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1202054A (en) * | 1966-08-15 | 1970-08-12 | Minnesota Mining & Mfg | Water-vapour permeable microporous materials and their production |
| GB1268615A (en) * | 1969-07-19 | 1972-03-29 | Kanegafuchi Spinning Co Ltd | Production of microporous structures |
| GB1464223A (en) * | 1974-05-25 | 1977-02-09 | Kuraray Co | Polyurethane-coated leather-like sheet materials |
| CN102383315A (en) * | 2010-08-28 | 2012-03-21 | 禾欣可乐丽超纤皮(嘉兴)有限公司 | Preparation method for superfine-fiber elastic base cloth |
-
2021
- 2021-01-11 CN CN202110030028.XA patent/CN112501918B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1202054A (en) * | 1966-08-15 | 1970-08-12 | Minnesota Mining & Mfg | Water-vapour permeable microporous materials and their production |
| GB1268615A (en) * | 1969-07-19 | 1972-03-29 | Kanegafuchi Spinning Co Ltd | Production of microporous structures |
| GB1464223A (en) * | 1974-05-25 | 1977-02-09 | Kuraray Co | Polyurethane-coated leather-like sheet materials |
| CN102383315A (en) * | 2010-08-28 | 2012-03-21 | 禾欣可乐丽超纤皮(嘉兴)有限公司 | Preparation method for superfine-fiber elastic base cloth |
Non-Patent Citations (1)
| Title |
|---|
| 王云等.二元溶剂体系对聚氨酯干法膜力学性能的影响.《聚氨酯工业》.2018,(第03期), * |
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