CN115305727A - Preparation process for improving yield of water-based suede microfiber leather - Google Patents
Preparation process for improving yield of water-based suede microfiber leather Download PDFInfo
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- CN115305727A CN115305727A CN202210960338.6A CN202210960338A CN115305727A CN 115305727 A CN115305727 A CN 115305727A CN 202210960338 A CN202210960338 A CN 202210960338A CN 115305727 A CN115305727 A CN 115305727A
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- 229920001410 Microfiber Polymers 0.000 title claims abstract description 41
- 239000003658 microfiber Substances 0.000 title claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000010985 leather Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000004744 fabric Substances 0.000 claims description 125
- 239000002585 base Substances 0.000 claims description 77
- 239000003513 alkali Substances 0.000 claims description 62
- 238000001035 drying Methods 0.000 claims description 51
- 238000000034 method Methods 0.000 claims description 34
- 238000000227 grinding Methods 0.000 claims description 19
- 238000004898 kneading Methods 0.000 claims description 19
- 238000005406 washing Methods 0.000 claims description 19
- 238000005096 rolling process Methods 0.000 claims description 16
- 244000137852 Petrea volubilis Species 0.000 claims description 14
- 239000000835 fiber Substances 0.000 claims description 13
- 229920005749 polyurethane resin Polymers 0.000 claims description 12
- 238000005470 impregnation Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 238000010025 steaming Methods 0.000 claims description 8
- 210000002268 wool Anatomy 0.000 claims description 6
- 229920005989 resin Polymers 0.000 description 12
- 239000011347 resin Substances 0.000 description 12
- 239000002649 leather substitute Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000008601 oleoresin Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
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- 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
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B15/00—Removing liquids, gases or vapours from textile materials in association with treatment of the materials by liquids, gases or vapours
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B3/00—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating
- D06B3/10—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating of fabrics
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B3/00—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating
- D06B3/10—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating of fabrics
- D06B3/18—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating of fabrics combined with squeezing, e.g. in padding machines
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C11/00—Teasing, napping or otherwise roughening or raising pile of textile fabrics
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C19/00—Breaking or softening of 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
- D06N3/007—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
- D06N3/0077—Embossing; Pressing of the surface; Tumbling and crumbling; Cracking; Cooling; Heating, e.g. mirror finish
-
- 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
- D06N2211/00—Specially adapted uses
- D06N2211/12—Decorative or sun protection articles
- D06N2211/28—Artificial leather
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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 relates to the field of water-based suede leather making, and discloses a preparation process for improving the yield of water-based suede microfiber leather.
Description
Technical Field
The invention relates to the field of water-based suede leather making, in particular to a preparation process for improving the yield of water-based suede microfiber leather.
Background
The water-based microfiber leather is water-based synthetic leather made of microfiber and a water-based resin material, the base material is water-based microfiber, and the surface layer is synthetic leather processed by water-based resin, so that the water-based microfiber leather is called full water-based microfiber leather.
The biggest difference between the water-based microfiber synthetic leather and the oily microfiber synthetic leather is the difference between the resins, so that the performance of microfiber synthetic leather and the performance of the microfiber synthetic leather are different; the biggest difference between the two is that the ecology of the microfiber leather is different. The oily microfiber leather contains DMF solvent harmful to human body, while the water microfiber leather has no DMF solvent, and the microfiber leather has pleasant aroma and is harmless to human body; the oily resin and the aqueous resin polymer materials used for manufacturing the microfiber leather substrate have different structures and properties, so that the appearance and physical properties of the aqueous microfiber and the oily microfiber are also greatly different; generally, the oleoresin is a high-molecular straight-chain type single-parent material, has good filling ratio among superfine fibers when manufacturing a superfine fiber leather base material, and has stronger elasticity ratio after the superfine fibers are reduced; the water-based resin contains a large number of side groups on a polymer chain, is an amphiphilic polymer material, has a smaller relative molecular weight than the oleoresin, and therefore has different filling properties in the space of the superfine fibers and wrapping properties on the superfine fibers. Usually, the water-based microfiber has better drapability and better simulation effect.
At present, the water-based microfiber processing generally adopts the processes of water-based resin impregnation, drying, weight reduction, sanding, left-falling stroke washing, drying and after-finishing. The process is called dry-method aqueous microfiber process because the process does not go through wet process. The water-based dry-method microfiber process is a great innovation for processing microfiber leather substrates. The aqueous resin has low viscosity and adjustability of viscosity, so that the non-woven microfiber cloth can be completely impregnated and filled, which is the basic condition of the impregnation process of the aqueous microfiber. The biggest technical key point of the water-based microfiber impregnation process is to design the viscosity and solid content of resin and control the distribution and content of the resin in the microfiber. When the microfiber containing a certain amount of resin is dried by an oven, the resin shows the water resistance, alkali resistance and solvent resistance.
Due to the continuous improvement of living standard and the continuous enhancement of environmental protection consciousness of people, the superfine fiber artificial leather becomes the main development stream of the artificial leather synthetic leather industry by virtue of excellent physical properties, outstanding ecological environmental protection performance, relatively low cost and multifunctional characteristics; and because the leather is easy to cut, high in utilization rate and easy to clean, the product is widely applied to the industries of shoes making, bags, handbags, sofa furniture, car decorations, clothes, packaging, sports goods, electronic digital products and the like, and therefore, the development of a manufacturing process for improving the yield of the aqueous microfiber suede leather is urgently needed.
Disclosure of Invention
The invention provides a preparation process for improving the yield of aqueous suede microfiber leather, which comprises the following steps:
the method comprises the following steps: taking a figured sea-island fiber non-woven base fabric with the thickness of 2.5-3.0mm and the density of more than 2.0;
step two: carrying out impregnation process on the base fabric obtained in the first step, and specifically:
preparing polyurethane resin into water-based polyurethane resin with solid content of 28-30% and viscosity of 15-20 s, and applying 3-4 rolling grooves to fully pad the base cloth, and using a mesh bag drying tunnel with length of 39 m and length of 3m per section; in the cloth drying process, the front section of a 5-15 m drying tunnel is kept at the temperature of 100-120 ℃, and the air supply frequency is in the range of 30-50 Hz; the drying tunnel with the rear section of 15-39 meters is used at 125-150 ℃, and the air supply frequency is in the range of 50-80 Hz; drying at 60-70 Hz and 5-6 m/min;
step three: pre-alkali amount of the impregnated base cloth in the second step: preparing an alkali amount tank with the concentration of 2% -4% and the length of 10m, padding the impregnated base fabric for 3-5min, steaming in a steam box at the temperature of 80-100 ℃ for 1h, and taking out; putting the base cloth with the pre-alkali amount into a cylinder, using alkali with 0.8-1% of liquid ratio, preserving the heat at 95-100 ℃ for 40-60min to carry out the alkali amount, washing the base cloth in the cylinder for 2-4 times, and taking out the cloth;
step four: rolling the alkali cloth obtained in the third step by a padder, and drying the alkali cloth in an oven with the total length of 33 meters at the temperature of 120-150 ℃ and the speed of 4.5-5.5 m/min;
step five: carrying out air kneading on the dried base cloth in the fourth step, setting a main fan of air kneading equipment to be 40Hz-50Hz, setting a lower fan to be 50Hz-75Hz, controlling the temperature to be 80-90 ℃, and carrying out kneading at the speed of 4-5 m/min;
step six: sanding the dried cloth obtained in the fifth step: the first grinding head of the first surface uses 240 model sand paper, the second grinding head uses 400 model sand paper, the speed is 2.8-3.5m/min, the first surface is sanded, and the second surface uses the same process as the first surface;
step seven: carrying out middle splitting on the base cloth after the wool is ground in the sixth step, wherein splitting equipment is used for splitting the base cloth at the speed of 5m/min, so that 2 rolls of the original base cloth are changed into 2 rolls of base cloth with the same thickness;
step eight: carrying out 60-90 ℃ six times on the seven pieces of base cloth with the leather, and carrying out water washing after heat preservation for 20min each time to ensure color fastness;
step nine: and (5) rolling the alkali cloth obtained in the step eight through a padder, and drying the alkali cloth in an oven with the total length of 33 meters at the temperature of 120-150 ℃ at the speed of 6-8 m/min.
The invention has the beneficial effects that: the invention can double the yield, thereby reducing the energy consumption and the emission, and compared with the traditional process, the invention has the advantages of mechanical test and appearance evaluation.
Detailed Description
The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand the subject matter described herein and are not intended to limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as necessary. In addition, features described with respect to some examples may also be combined in other examples.
Example 1
In this embodiment, a preparation process for increasing yield of aqueous suede microfiber leather is provided, which includes the following steps:
the method comprises the following steps: taking a figured sea-island fiber non-woven base fabric with the thickness of 2.5mm and the density of more than 2.0;
step two: carrying out impregnation process on the base fabric obtained in the first step, and specifically:
preparing polyurethane resin into a mesh bag drying tunnel with solid content of 28% and viscosity of 15 seconds, fully padding the base fabric by using the waterborne polyurethane resin with 3 rolling grooves, and using 3 meters per section and total length of 39 meters; in the cloth drying process, the front section of a 5m drying tunnel is kept at the temperature of 100 ℃, and the air supply frequency is in the range of 30 Hz; the drying tunnel with the rear section of 15 meters is used at 125 ℃, and the air supply frequency is in the 50Hz interval; drying at the integral dehumidifying frequency of 60Hz and the speed of 5 m/min;
step three: pre-alkali amount of the impregnated base cloth in the second step: preparing a 2% alkali bath with a length of 10m, padding the impregnated base fabric for 3min, steaming in a 80 ℃ steam box for 1h, and taking out; putting the base cloth with the pre-alkali amount into a cylinder, using 0.8% alkali in liquid ratio, keeping the temperature at 95 ℃ for 40 times to carry out alkali amount, then washing the base cloth in the cylinder for 2 times, and taking out the cloth;
step four: rolling the alkali cloth obtained in the third step by a padder, and drying the alkali cloth in an oven with the total length of 33 meters at the temperature of 120 ℃ and the speed of 4.5 m/min;
step five: carrying out air kneading on the dried base cloth in the fourth step, setting a main fan of air kneading equipment to be 40HzHz, setting a lower fan to be 50Hz-75Hz, setting the temperature to be 80 ℃, and carrying out kneading at the speed of 4 m/min;
step six: sanding the dried cloth obtained in the fifth step: the first grinding head of the first surface uses 240 model sand paper, the second grinding head uses 400 model sand paper, the speed is 2.8m/min, the first surface is sanded, and the second surface uses the same process as the first surface;
step seven: carrying out middle splitting on the base cloth after the wool is ground in the sixth step, wherein splitting equipment is used for splitting the base cloth at the speed of 5m/min, so that 2 rolls of the original base cloth are changed into 2 rolls of base cloth with the same thickness;
step eight: carrying out washing on seven pieces of base cloth with leather at 60 ℃ for six times, and carrying out heat preservation for 20min each time to ensure color fastness;
step nine: and (5) rolling the alkali cloth obtained in the step eight through a padder, and drying the rolled alkali cloth in an oven with the total length of 33 meters at the temperature of 120 ℃ at the speed of 6 m/min.
Example 2
In the embodiment, a preparation process for improving the yield of aqueous suede microfiber leather is provided, and comprises the following steps:
the method comprises the following steps: taking island-defining sea-island fiber non-woven base fabric with the thickness of 2.75mm and the density of more than 2.1;
step two: carrying out impregnation process on the base fabric obtained in the first step, and specifically:
preparing the polyurethane resin into a mesh bag drying tunnel with solid content of 29 percent and viscosity of 17.5 seconds, fully padding the base fabric by using the aqueous polyurethane resin with 3.5 rolling grooves, and using a mesh bag drying tunnel with 3 meters per section and total length of 39 meters; in the cloth drying process, the front section 10m drying tunnel is kept at the temperature of 110 ℃, and the air supply frequency is in the interval of 40 Hz; the drying tunnel with the rear section of 27 meters is used at 137 ℃, and the air supply frequency is in the range of 65 Hz; drying at the integral dehumidifying frequency of 65Hz and the speed of 5.5 m/min;
step three: pre-alkali amount of the impregnated base cloth in the step two: preparing a 10m alkali bath with concentration of 3%, padding the impregnated base fabric for 4min, steaming in a steaming box at 90 deg.C for 1h, and taking out; putting the base cloth with the pre-alkali amount into a jar, preserving the heat of 97.5 ℃ for 50min by using 0.9 percent alkali, carrying out water washing in the jar for 3 times, and taking out the cloth;
step four: rolling the alkali cloth obtained in the third step by a padder, and drying the rolled alkali cloth in an oven with the total length of 33 meters at the temperature of 135 ℃ and the speed of 5 m/min;
step five: carrying out air kneading on the dried base cloth in the step four, setting a main fan of air kneading equipment to be 45Hz, setting a lower fan to be 62.5Hz, setting the temperature to be 85 ℃, and carrying out kneading at the speed of 4.5 m/min;
step six: sanding the dried cloth obtained in the step five: the first grinding head of the first surface uses 240 model sand paper, the second grinding head uses 400 model sand paper, the speed is 3.15m/min, the first surface is ground, and the second surface uses the same process as the first surface;
step seven: carrying out middle splitting on the base cloth after the wool is ground in the sixth step, wherein splitting equipment is used for splitting the base cloth at the speed of 5m/min, so that 2 rolls of the original base cloth are changed into 2 rolls of base cloth with the same thickness;
step eight: carrying out washing on seven pieces of base cloth with leather at 75 ℃ for six times, and carrying out heat preservation for 20min each time to ensure color fastness;
step nine: the alkali cloth obtained in the step eight is dried in an oven with the total length of 33 meters at the temperature of 135 ℃ and the speed of 7m/min after being rolled by a padder
Example 3
In the embodiment, a preparation process for improving the yield of aqueous suede microfiber leather is provided, and comprises the following steps:
the method comprises the following steps: taking a figured sea-island fiber non-woven base fabric with the thickness of 13.0mm and the density of 2.5;
step two: carrying out impregnation process on the base fabric obtained in the first step, and specifically:
preparing polyurethane resin into 30% solid content and 20 seconds of viscosity, fully padding the base fabric by using the waterborne polyurethane resin with 4 rolling grooves, and using a mesh bag drying tunnel with 3 meters per section and 39 meters of total length; in the cloth drying process, the front 15m drying tunnel is kept at the temperature of 120 ℃, and the air supply frequency is in the 50Hz range; the drying tunnel with the rear section of 39 meters is used at 150 ℃, and the air supply frequency is in the interval of 80 Hz; drying at the integral dehumidifying frequency of 70Hz and the speed of 6 m/min;
step three: pre-alkali amount of the impregnated base cloth in the step two: preparing an alkali amount tank with the concentration of 2% -4% and the length of 10m, padding the impregnated base fabric for 5min, steaming in a steam box at the temperature of 100 ℃ for 1h, and taking out; putting the base cloth with the pre-alkali amount into a cylinder, using alkali with the liquid ratio of 1%, preserving the heat for 60min at 100 ℃ for alkali amount, washing the base cloth in the cylinder for 4 times, and taking out the cloth;
step four: rolling the alkali cloth obtained in the third step by a padder, and drying the alkali cloth in an oven with the total length of 33 meters at the temperature of 150 ℃ and the speed of 5.5 m/min;
step five: softening the dried base cloth in a wind kneading mode, setting a main fan of wind kneading equipment to be 50Hz, setting a lower fan to be 75Hz, setting the temperature to be 90 ℃, and kneading at the speed of 5 m/min;
step six: sanding the dried cloth obtained in the fifth step: the first grinding head of the first surface uses 240 model sand paper, the second grinding head uses 400 model sand paper, the speed is 3.5m/min, the first surface is ground, and the second surface uses the same process as the first surface;
step seven: carrying out middle splitting on the base cloth subjected to the hair grinding in the sixth step, wherein splitting equipment is used for splitting the base cloth at the speed of 5m/min, so that 2 rolls of the original base cloth are changed into the base cloth with the same thickness;
step eight: carrying out 90 ℃ six times on the seven pieces of base cloth with the leather, and carrying out water washing after heat preservation for 20min each time to ensure color fastness;
step nine: and (5) rolling the alkali cloth obtained in the step eight through a padder, and drying the rolled alkali cloth in an oven with the total length of 33 meters at the temperature of 150 ℃ at the speed of 8 m/min.
Example 4
In this example, experimental group a aqueous suede microfiber leathers were first prepared:
the method comprises the following steps: taking a figured sea-island fiber non-woven base fabric with the thickness of 2.5mm and the density of 2.1;
step two: preparing the aqueous polyurethane resin into a mesh bag drying tunnel with solid content of 30 percent and viscosity of 18 seconds, fully padding the base cloth through 3 rolling grooves and guide rollers, controlling the liquid carrying at 180 percent, and using 3 meters per section and total length of 39 meters; in the cloth drying process, the first five-section 15-meter drying tunnel sequentially uses a 100 ℃ stroke-left 105 ℃, a 110 ℃ stroke-left 115 ℃ stroke-left 120 ℃ and an air supply frequency sequentially in a 30Hz stroke-left 40Hz stroke-left 50Hz interval; the drying tunnel with 8 sections of the rear section of 15-39 meters uses a drying tunnel with a temperature of 125 ℃ left-falling, 130 ℃ left-falling, a temperature of 135 ℃ left-falling, a temperature of 140 ℃ left-falling, a temperature of 145 ℃ left-falling, a temperature of 140 ℃ left-falling, a temperature of 130 ℃ left-falling, an air supply frequency in a region of 50Hz left-falling, 60Hz left-falling, 80Hz left-falling, 70Hz left-falling; dehumidifying in the first six sections at 70Hz, dehumidifying in the last 7 sections at 60Hz at the speed of 5m/min, and drying;
step three: the pre-alkali amount: padding the impregnated base cloth in the step two in an alkali bath with the alkali liquor concentration of 3% and the length of 10m for 4min, steaming in a steam box at the temperature of 90 ℃ for 1h, and taking out; putting the base cloth with the pre-alkali amount into a cylinder, preparing alkali with 0.9% liquid ratio, keeping the temperature at 95 ℃ for 60min for alkali amount, washing with water at 60 ℃ for 4 times for 20min after the alkali amount is finished, cleaning impurities from the alkali on the surface, and taking out the impurities after the alkali amount is finished;
step four: after the alkali amount base cloth in the third step is paddled, a pin board forming and tentering oven with a total length of 33 meters and 11 knots is arranged, the temperature is 120 ℃ left-falling 125 ℃ left-falling 130 ℃ left-falling 135 ℃ left-falling 140 ℃ left-falling 150 ℃ left-falling 140 ℃ left-falling 130 ℃ left-falling 120 ℃ speed 5m/min speed is arranged, and the air supply frequency is 50Hz for drying;
step five: the dried base cloth in the fourth step is kneaded and softened in a wind kneading mode, a main fan of wind kneading equipment is set to be at the frequency of 50Hz, a lower fan is set to be at the frequency of 60Hz, the temperature is 90 ℃, and the speed is 5 m/min;
step six: sanding the dried cloth obtained in the step five: grinding the front side: the first grinding head uses 240 model Lu Sand paper to grind in positive rotation, the second grinding head uses 400 model Lu Sand paper to grind in positive rotation at a speed of 3m/min, the front side is ground, and the back side uses the same process as the front side;
step seven: measuring the thickness of the base cloth after the wool grinding in the sixth step, taking the intermediate value, and changing one original roll of cloth into two rolls at a speed of 5m/min through a splitting device;
eighthly, washing the seven pieces of base cloth with water for six times at 90 ℃, 80 ℃, 70 ℃, 60 ℃, and 20min each time to ensure color fastness;
after the water washing base cloth in the step eight is subjected to padder squeezing, drying the base cloth in a needle plate setting and tentering oven with the total length of 33 meters and 11 knots, wherein the temperature is 120 ℃ from left to right, the temperature is 125 ℃ from left to right, the temperature is 130 ℃ from left to right, the temperature is 135 ℃ from left to right, the temperature is 140 ℃ from left to right, the temperature is 150 ℃ from left to right, the temperature is 130 ℃ from left to right, the temperature is 120 ℃ from left to right, the speed is 8m/min, and the base cloth is dried at the frequency division rate of 50 Hz;
then, preparing the aqueous suede microfiber leather of experimental group B:
the method comprises the following steps: taking a figured sea-island fiber non-woven base fabric with the thickness of 2.8mm and the density of 2.1;
step two: preparing the aqueous polyurethane resin into a mesh bag drying tunnel with solid content of 28 percent and viscosity of 20 seconds, leading the base cloth to be fully padded through 4 rolling grooves and guide rollers, controlling the liquid carrying rate to be 180 percent, and using 3 meters per section and total length of 39 meters; in the cloth drying process, the first five sections of 15-meter drying tunnels are sequentially formed by a 100 ℃ stroke, a 110 ℃ stroke, a 120 ℃ stroke, and an air supply frequency which is sequentially in a 30Hz stroke, a 50Hz stroke; the drying tunnel with 8 sections of the rear section of 15-39 meters uses a region with 125 ℃ left-falling, 135 ℃ left-falling, 140 ℃ left-falling, 150 ℃ left-falling, 140 ℃ left-falling, 130 ℃ left-falling and an air supply frequency in a region with 50Hz left-falling, 60Hz left-falling, 80Hz left-falling, 70Hz left-falling; the first six sections are dehumidified by 70Hz, the second 7 sections are dehumidified by 60Hz, the speed is 5m/min, and drying is carried out;
step three: pre-alkali amount: padding the impregnated base cloth in the second step in an alkali solution tank with the concentration of 4% and the length of 10m for 4min, steaming in a steam box at the temperature of 90 ℃ for 1h, and taking out; putting the base cloth with the pre-alkali amount into a cylinder, preparing alkali with a liquid ratio of 1.0%, carrying out heat preservation at 95 ℃ for 50min to carry out alkali amount, washing with water with the heat preservation at 90 ℃ for 20min twice and the heat preservation at 60 ℃ for 20min twice after completing the alkali amount, cleaning impurities from the alkali on the surface, and taking out after completing the washing;
step four: after the alkali amount base cloth in the third step is paddled, a pin board forming and tentering oven with a total length of 33 meters and 11 knots is arranged, the temperature is 120 ℃ left-falling 125 ℃ left-falling 130 ℃ left-falling 135 ℃ left-falling 140 ℃ left-falling 150 ℃ left-falling 140 ℃ left-falling 130 ℃ left-falling 120 ℃ speed 5m/min speed is arranged, and the air supply frequency is 50Hz for drying;
step five: the dried base cloth in the fourth step is kneaded and softened in a wind kneading mode, a main fan of wind kneading equipment is set to be at the frequency of 50Hz, a lower fan is set to be at the frequency of 70Hz, the temperature is 90 ℃, and the speed is 4 m/min;
step six: sanding the dried cloth obtained in the step five: grinding the front side: the first grinding head uses 240 model Lu Sand paper to grind in positive rotation, the second grinding head uses 400 model Lu Sand paper to grind in positive rotation at a speed of 3.2m/min, the front side is ground, and the back side uses the same process as the front side;
step seven: measuring the thickness of the base cloth after the wool grinding in the sixth step, taking an intermediate value, and turning the original one roll of cloth into two rolls at a speed of 5m/min through a splitting device;
step eight, carrying out overflow water washing on the seven pieces of base cloth with the skins in the step seven, wherein the overflow water washing is carried out for five times at 90 ℃, 80 ℃, 70 ℃, 20min for each time and 20min for 2 times at 60 ℃, and the water washing is carried out to ensure the color fastness;
step nine: after the water-washed base fabric in the step eight is subjected to padder squeezing, the base fabric is dried in a needle plate setting and tentering oven with a total length of 33 meters and 11 knots, a temperature of 120 ℃ left-falling 125 ℃ left-falling 130 ℃ left-falling 135 ℃ left-falling 140 ℃ left-falling 150 ℃ left-falling 130 ℃ left-falling 120 ℃ left-falling 7m/min speed and an air supply frequency of 50 Hz.
The water-based suede microfiber leather prepared by the traditional process is selected as a control group, three groups are tested, and the test results are shown in the following table:
as can be seen from the comparison of the above table, the prepared water-based suede microfiber leather has no obvious deviation in the aspect of mechanical test compared with the water-based suede microfiber leather prepared by the traditional process, and several items of test data even exceed the traditional process, but the invention can realize the purpose of doubling the yield.
Although the embodiment of the present invention has been described above, the present embodiment is not limited to the above specific embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present embodiment and the appended claims.
Claims (1)
1. A preparation process for improving the yield of aqueous suede microfiber leather is characterized by comprising the following steps:
the method comprises the following steps: taking figured sea-island fiber non-woven base cloth with the thickness of 2.5-3.0mm and the density of more than 2.0;
step two: carrying out impregnation process on the base fabric obtained in the first step, and specifically:
preparing polyurethane resin into a mesh bag drying tunnel with solid content of 28-30% and viscosity of 15-20 seconds, fully padding base cloth by using aqueous polyurethane resin with 3-4 rolling grooves, and using 3 meters per section and total length of 39 meters; in the cloth drying process, the front section of a 5-15 m drying tunnel is kept at the temperature of 100-120 ℃, and the air supply frequency is in the range of 30-50 Hz; the drying tunnel with the rear section of 15-39 meters is used at the temperature of 125-150 ℃, and the air supply frequency is in the range of 50-80 Hz; drying at 60-70 Hz and 5-6 m/min;
step three: pre-alkali amount of the impregnated base cloth in the step two: preparing a 10 m-long alkali tank with the concentration of 2% -4%, padding the impregnated base fabric for 3-5min, steaming in a steam box at the temperature of 80-100 ℃ for 1h, and taking out; putting the base cloth with the pre-alkali amount into a cylinder, using alkali with 0.8-1% of liquid ratio, preserving the heat at 95-100 ℃ for 40-60min to carry out the alkali amount, washing the base cloth in the cylinder for 2-4 times, and taking out the cloth;
step four: rolling the alkali cloth obtained in the third step by a padder, and drying the alkali cloth in an oven with the total length of 33 meters at the temperature of 120-150 ℃ and the speed of 4.5-5.5 m/min;
step five: carrying out air kneading on the dried base cloth in the fourth step, setting a main fan of air kneading equipment to be 40Hz-50Hz, setting a lower fan to be 50Hz-75Hz, controlling the temperature to be 80-90 ℃, and carrying out kneading at the speed of 4-5 m/min;
step six: sanding the dried cloth obtained in the fifth step: the first grinding head of the first surface uses 240 model sand paper, the second grinding head uses 400 model sand paper, the speed is 2.8-3.5m/min, the first surface is ground, and the second surface uses the same process as the first surface;
step seven: carrying out middle splitting on the base cloth after the wool is ground in the sixth step, wherein splitting equipment is used for splitting the base cloth at the speed of 5m/min, so that 2 rolls of the original base cloth are changed into 2 rolls of base cloth with the same thickness;
step eight: carrying out 60-90 ℃ six times on the seven pieces of base cloth with the leather, and carrying out water washing after heat preservation for 20min each time to ensure color fastness;
step nine: and (5) rolling the alkali cloth obtained in the step eight through a padder, and drying the alkali cloth in an oven with the total length of 33 meters at the temperature of 120-150 ℃ at the speed of 6-8 m/min.
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Application publication date: 20221108 |