CN1410625A - Manufacturing method of synthetic leather possessing air permeability - Google Patents
Manufacturing method of synthetic leather possessing air permeability Download PDFInfo
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- CN1410625A CN1410625A CN 01141618 CN01141618A CN1410625A CN 1410625 A CN1410625 A CN 1410625A CN 01141618 CN01141618 CN 01141618 CN 01141618 A CN01141618 A CN 01141618A CN 1410625 A CN1410625 A CN 1410625A
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Abstract
In the invention, the wet hardening polyurethane or hydrophilic wet hardening polyurethane is utilized as the bonding layer. With rubberizing method, the involucra layer of the polyurethane or the porous macromolecule involucra layer is adhibited on the air permeability basis material layer. The involucra layer of the polyurethane possesses the hydrophilic bond segment. Since the bonding procedure does not need of the solvent in the invention, the pollution to air is reduced greatly. Also the step for drying the solvent is eliminated so as to speed up the production and lower the cost. Since the product possesses the air permeability, the added value of the product is increased greatly.
Description
Technical Field
The invention relates to a method for manufacturing a breathable synthetic leather, in particular to a method for manufacturing a breathable synthetic leather by using moisture-cured polyurethane as an adhesive layer.
Background
The production of synthetic leather has been in the past for many years and is widely used in the consumer industry, such as leather bags, leather clothing, leather decorations, sports shoes, etc., and the production method of synthetic leather is described in detail in the handbook of polyurethane resin (published by journal industry news). In recent years, the development of patents has been focused mainly on the improvement of functionality, such as air permeability, fire resistance, design or color formation. For example, Dongli in Japan manufactures synthetic leather by adding calcium carbonate and phosphide to polyurethane to give good air-and moisture-permeable effects (JP 49008507), Kato et al manufactures artificial leather having excellent flexibility by using fine fibers and polyurethane (USP 4,612,228); dongli uses polyacrylate polymer, halogen phosphate and polyurethane to produce synthetic leather with self-extinguishing property (JP 58013786); dongli uses ethylene hexene polyacrylate fiber and polyurethane to produce a polyurethane synthetic leather having a three-dimensional pattern (EP 98604).
The polyurethane binder (binder) used in the above patents is mostly liquid polyurethane containing solvent, and has a disadvantage that the solvent is evaporated when the synthetic leather is manufactured, and thus a large amount of solvent is released to cause pollution. Kiren et al, which uses a granular hot-melt polyurethane, which is melted by heating and then combined with a non-woven fabric, produce an artificial leather suitable for a handbag (JP 60099078), which is free from solvent contamination, but the polyurethane used is a non-moisture-curable polyurethane and has no air-permeable function.
The invention is a continuation application of Taiwan patent invention No. 116847; the original application is a method for manufacturing polyurethane synthetic leather, which uses moisture-hardening polyurethane as an adhesive layer, thus overcoming the problem of environmental pollution during manufacturing, but the synthetic leather manufactured by the method has no air-permeable function.
3.5 hundred million yards are produced in the synthetic leather year all over the world, and China occupies 1.5 hundred million yards and is a large producing country; however, the use of a large amount of organic solvent causes high production cost and environmental safety.
Disclosure of Invention
Therefore, how to reduce the use of organic solvent, maintain the environmental safety and the health of operators, accord with the environmental protection regulation, make the manufactured synthetic leather have air permeability, increase the value of the product is the technical problem to be solved by the invention.
The invention provides a method for manufacturing a breathable synthetic leather, which comprises the step of manufacturing a leather film layer, wherein the leather film layer is polyurethane with a hydrophilic chain segment or a porous high-molecular leather film. Wherein, the polyurethane can be selected from the following six types: (1) a particulate hot melt polyurethane, (2) an ultraviolet curable polyurethane, (3) a single solvent polyurethane, (4) a waterborne polyurethane, (5) a moisture curable polyurethane, or (6) a conventional multi-solvent polyurethane; the porous polymer film may be a tetrafluoroethylene film or a polyester film, such as Gortex (W.L.Gore Co., USA)®Or Sympatex from Akzopiber, Germany®The pore diameter of the porous membrane is between 0.04 and 3 μm. And then the skin layer is adhered on the base material layer with air permeability by moisture-cured polyurethane or hydrophilic moisture-cured polyurethane. The moisture hardening polyurethane or hydrophilic moisture hardening polyurethane used for bonding is solid, is heated and melted by a hot melting machine, is coated on the skin film layer, and is attached with the substrate layer to finish the manufacturing of the synthetic skin. The coating mode of the bonding layer can be a comprehensive sizing mode or a discontinuous sizing mode, wherein the discontinuous sizing mode can be spot sizing, porous sizing or fish scale sizing and the like. If a non-hydrophilic moisture-curing polyurethane is used as the adhesive layer, a discontinuous sizing must be used to impart breathability thereto. The finished synthetic leather product produced in the above manner is exposed to the atmosphere and is cured by moisture against the adhesive layerAfter isocyanate functional groups in polyurethane prepolymer (prepolymer) and water vapor in the air are reacted, the breathable synthetic leather is formed, and the physical properties of the final synthetic leather are achieved. The manufacturing process of the breathable synthetic leather can also be implemented by firstly melting the moisture-cured polyurethane of the bonding layer or the hydrophilic moisture-cured polyurethane, then coating the melted moisture-cured polyurethane on the substrate layer, and then attaching the leather layer to finish the manufacturing of the synthetic leather.
The invention relates to a method for manufacturing breathable synthetic leather, which comprises the following steps:
(a) forming a polyurethane coating layer or a porous polymer coating layer selected from the group consisting of particle hot melt polyurethane, ultraviolet hardening polyurethane, multi-solvent polyurethane, single-solvent polyurethane, waterborne polyurethane and moisture hardening polyurethane, wherein the polyurethane of the coating layer has a hydrophilic bond segment;
(b) coating moisture-hardening polyurethane or hydrophilic moisture-hardening polyurethane on the skin layer in a comprehensive gluing mode or a discontinuous gluing mode to serve as a bonding layer, wherein when the moisture-hardening polyurethane is non-hydrophilic, the moisture-hardening polyurethane is coated in a discontinuous gluing mode; and
(c) and adhering a breathable base material layer to the bonding layer.
The invention also relates to a manufacturing method of the breathable synthetic leather, which comprises the following steps:
(a) forming a polyurethane coating layer or a porous polymer coating layer selected from the group consisting of particle hot melt polyurethane, ultraviolet hardening polyurethane, multi-solvent polyurethane, single-solvent polyurethane, waterborne polyurethane and moisture hardening polyurethane, wherein the polyurethane of the coating layer has a hydrophilic chain segment;
(b) coating moisture-hardening polyurethane or hydrophilic moisture-hardening polyurethane on an air-permeable substrate layer in a comprehensive gluing mode or a discontinuous gluing mode to serve as a bonding layer, wherein when the moisture-hardening polyurethane is non-hydrophilic, the moisture-hardening polyurethane is coated in a discontinuous gluing mode; and
(c) and adhering the substrate layer coated with the bonding layer with the coating layer.
Because the preparation method of the invention does not need to use solvent when the film layer is adhered to the substrate layer, the pollution to the air can be greatly reduced. And secondly, because no solvent is used, the drying step of solvent evaporation can be reduced, the production rate is further increased, and the production cost is reduced. Moreover, the manufactured synthetic leather has air permeability, the unit price of the synthetic leather can be greatly improved by 2 to 10 times, and the added value of the product is increased.
In the present invention, "air permeability" is measured by the moisture permeability in JIS-L-1099, A-1As indicated by the test results, if the moisture permeability is 1,500g-H or more2O/m224hr, the air permeability property of this level is in accordance with the air permeability required by human body during slight exercise. The above JIS-L-1099, A-1 test method is to put anhydrous calcium chloride in a moisture absorption cup with a diameter of 6 cm and a height of 2.2 cm, cover a synthetic leather test piece on the cup, and fasten and seal it with a gasket. Then placing the mixture in a constant temperature and humidity device with the temperature of 40 +/-2 ℃ and the humidity of 90 +/-5% RH, weighing after 1 hour, and converting the weight change into the weight change of unit area in unit time to obtain the moisture permeability.
In the present invention, the term "hydrophilic" refers to polyurethanes having 5-40 wt% ethylene oxide (segment) linkages thereon, wherein% is based on the molecular weight of the polyurethane being 100%; wherein, the polyurethane used in the coating layer has the hydrophilic chain segment, and the polyurethane used in the bonding layer can contain the hydrophilic bond segment or not contain the hydrophilic bond segment. The polyurethane of the present invention preferably has a content of the hydrophilic ethylene oxide segment of 5 to 25% by weight.
In the present invention, the term "knife roll coating" (knife roller coater) or "roll coating" refers to the coating of polyurethane using a knife in conjunction with a roll. The roller is provided with a regular mesh, and the sizing amount and the sizing pattern can be controlled by utilizing the mesh value.
In the method of the present invention, the polyurethane of the skin layer must have a hydrophilic segment, and if a moisture-curable polyurethane having no hydrophilicity is used as the adhesive layer, the adhesive layer is applied to the skin layer in a discontinuous sizing manner. The adhesive layer can also be coated on the substrate layer and then adhered with the skin film layer.
In the preparation method of the present invention, step (a) further comprises coating hydrophilic polyurethane on a release paper or a release film to form a skin layer, which can be coated on the release paper or the release film by roll coating, spray coating, curtain coating or impregnation, wherein roll coating is preferred; the step (a) also comprises the steps of diluting single-solvent type or multi-solvent type polyurethane or waterborne polyurethane in a proper solvent into a solution with the solid content of 10-30 wt%, then coating the solution on release paper or release film, and drying the release paper or release film; wherein, the step (a) also comprises the steps of coating the melted solid moisture-hardening polyurethane or the melted particle hot-melt polyurethane on release paper or release film; wherein the step (a) further comprises coating the ultraviolet-curable polyurethane on release paper or release film, and polymerizing the ultraviolet-curable polyurethane by irradiation with ultraviolet rays to form a skin layer.
According to the preparation method of the invention, a polyurethane film layer with hydrophilicity can be formed firstly. The method for forming the polyurethane film layer is to coat the hydrophilic polyurethane on a release paper or a release film. The release paper or release film may be of high temperature resistant type, medium temperature resistant type or low temperature resistant type, such as polyethylene and silicone release agent coated on kraft paper, reinforced kraft paper, silicone release agent coated on grey paper or silicone-containing release agent coated on plastic film. For example, in the case of multi-solvent polyurethane, single-solvent polyurethane or aqueous polyurethane, the polyurethane can be dissolved in a suitable solvent to be diluted into a solution containing 10-30 wt% of solids, and then the solution can be coated on release paper or release film. The coating viscosity is preferably 1,000-3,000 centipoise (cps), and the coating thickness is preferably 0.02 to 0.3 mm. The coating method may be knife roll coating, spray coating, curtain coating, or impregnation, and the knife roll coating method is preferred. When the polyurethane is granular hot-melt polyurethane or moisture-hardening polyurethane, the polyurethane is heated and melted and then directly coated on release paper or release film to form a skin film layer.
When multi-solvent polyurethane or single-solvent polyurethane or waterborne polyurethane is used as the skin layer, the skin layer is dried after being attached to the release paper or the release film, usually two-stage drying is carried out in an oven at about 60-100 ℃ and about 120-160 ℃ for 1-10 minutes, and then the obtained product is cooled and then sent to the next step for coating the adhesive layer. If a moisture-curing polyurethane or a particulate hot-melt polyurethane is used, the adhesive can be applied directly to the next step without drying.
The coating layer of the present invention may be a porous polymer coating (e.g., Gortex)®、Svmdatex®Etc.), can be directly sent to the coating adhesive without using release paper or release film.
In the method of the present invention, wherein the step (b) further comprises melting the solid moisture-hardening polyurethane or the hydrophilic moisture-hardening polyurethane and then directly coating the melted solid moisture-hardening polyurethane on the skin layer or the substrate layer. The coating method can be roll coating, slot die coating, spray coating or dot printing; the coating mode can be a full-scale gluing mode or a discontinuous gluing mode, wherein the discontinuous gluing mode can be spot gluing, porosity gluing or fish scale gluing. The coating temperature is 100-180 ℃, the coating viscosity is 5,000-50,000 centipoises, and the coating thickness is 0.01-50 mm.
The moisture-hardening polyurethane in the adhesive layer (see 14 in fig. 1) has a chemical reaction principle that the moisture-hardening polyurethane has-NCO groups at its terminals and hardens by forming a bridge structure when contacted with an active hydrogen-containing compound such as water, ammonia, alcohol. For example, contact with moisture in the air will produce the following reaction:
(1) reacting with water to form amines
(2) With amines to produce urea
(3) React with urea to form a bridge structure
2R-NCO+R-NHCONH-R
The actual reaction is continued by (1), (2) and (3), and then the hardening is completed.
In the method of the present invention, the step (C) is to adhere a substrate layer or a film layer to the adhesive layer. Suitable substrate layers are required to have air permeability, for example, base fabrics such as industrial fabrics, woven nonwovens, knitted nonwovens, microfiber fabrics, porous polymer films; synthetic leather such as wet polyurethane synthetic leather and Erlang leather; the animal skin can be selected from cow skin, pig skin, sheep skin, etc. The mode of adhering the substrate layer can be a roller rolling mode, and the breathable synthetic leather can be obtained by peeling the release paper after cooling.
Because the bonding layer used by the invention is moisture hardening polyurethane or hydrophilic moisture hardening polyurethane, the prepared synthetic leather can be naturally hardened after standing for 1-72 hours at room temperature, and the leather layer and the substrate layer are firmly adhered to form the synthetic leather. If the hardening of the adhesive layer is to be accelerated, the hardening can also be accelerated by means of a steam bath or by means of a steam bath containing an ammonia derivative.
The release agent and the release paper can be called as release agent and release paper.
Drawings
In order to make the aforementioned and other objects, features, and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below:
FIG. 1 is a schematic cross-sectional view of a breathable synthetic skin of the present invention, showing the mechanism of ventilation;
FIG. 2 is a flow chart of a method of making a substrate layer bonded to a skin layer using conventional multi-solvent polyurethane, single-solvent polyurethane, or waterborne polyurethane as the skin layer and hydrophilic moisture-hardening polyurethane as the tie layer in accordance with the present invention;
FIG. 3 is a flow chart of a method of making a film layer using moisture-curable polyurethane and a tie layer using hydrophilic moisture-curable polyurethane in accordance with the present invention;
FIG. 4 is a flow chart of a method of making a UV-curable polyurethane for a skin layer and a hydrophilic moisture-curable polyurethane for an adhesive layer in accordance with the present invention;
FIG. 5 is a flow chart of a method of making a film using a granular hot melt polyurethane as a coating layer and a hydrophilic moisture curing polyurethane as an adhesive layer in accordance with the present invention;
FIG. 6 is a flow chart of a method of making a substrate layer coated with a hydrophilic moisture-hardening polyurethane as a tie layer in combination with a conventional multi-solvent polyurethane, single-solvent polyurethane, or waterborne polyurethane as a skin layer in accordance with the present invention; and
FIG. 7 is a flow chart of a method for manufacturing a porous polymer film as a film layer and a hydrophilic moisture-curable polyurethane as an adhesive layer according to the present invention.
Detailed Description
Referring to fig. 1, the synthetic leather of the present invention has a ventilation mechanism that moisture can escape through the synthetic leather formed by the breathable substrate layer 16, the hydrophilic moisture-curable polyurethane or the discontinuously coated moisture-curable polyurethane adhesive layer 14, and the hydrophilic polyurethane or the porous polymer skin layer 12.
Referring to fig. 2, fig. 2 is a schematic diagram of a breathable synthetic leather manufactured by the method of the present invention using waterborne polyurethane, single-solvent polyurethane or conventional multi-solvent polyurethane as a raw material of a leather layer. The release paper 201 wound on a roller 20 is conveyed to an oven 23 through rollers 21 and 22, a water-based polyurethane or single solvent polyurethane or traditional multi-solvent polyurethane dissolved into a solution is coated on the release paper 201 by a scraper 204 at the roller 22 to form a skin layer, the release paper 202 coated with the polyurethane is conveyed into an oven to be dried, then is cooled and rolled by a cooling roller 24 and is conveyed to a coating wheel 25, moisture-hardening polyurethane (adhesive layer) is coated on the skin layer through the scraper 205 at the coating wheel 25, and a base cloth 29 wound on the roller 27 is adhered on the adhesive layer through a laminating roller 26 and then is wound to form a product 28.
Referring to fig. 3, fig. 3 is a schematic view of the method of the present invention for manufacturing breathable synthetic leather using moisture-curable polyurethane as a raw material of a leather layer. First, a release paper 301 wound around a roller 30 is fed through rollers 31, 32, moisture-hardening polyurethane melted at the roller 32 is coated on the release paper 301 by a doctor blade 303 to form a skin layer, the polyurethane-coated release paper 302 is sprayed with water by a sprayer 304 and fed to a coating wheel 34 through a roller 33, the moisture-hardening polyurethane (adhesive layer) is coated on the skin layer by a doctor blade 305 at the coating feed 34, and a base cloth 37 wound around a roller 36 is attached on the adhesive layer through a laminating roller 35 and then wound to form a product 38.
Referring to fig. 4, fig. 4 is a schematic view of the method of the present invention for manufacturing breathable synthetic leather using uv-curable polyurethane as the raw material of the leather layer. First, a release paper 401 wound around a roll 40 is conveyed by rolls 41, 42, an ultraviolet-curable polyurethane at the roll 42 is coated on the release paper 401 by a doctor blade 403 to form a skin layer, the polyurethane-coated release paper 402 is irradiated by an ultraviolet lamp 404 and conveyed to a coating wheel 44 via a roll 43, a moisture-curable polyurethane (adhesive layer) is coated on the skin layer at the coating wheel 44 by a doctor blade 405, and a base cloth 47 wound around a roll 46 is adhered on the adhesive layer via a laminating roll 45 and then wound to form a product 48.
Referring to fig. 5, fig. 5 is a schematic view of the method of the present invention for manufacturing a breathable synthetic leather using a particle hot-melt polyurethane as a raw material of a leather layer. First, a release paper 501 wound around a roll 50 is conveyed by rolls 51, 52, a granular hot-melt polyurethane melted at the roll 52 is coated on the release paper 501 by a doctor blade 503 to form a skin layer, the polyurethane-coated release paper 502 is conveyed to a coating wheel 54 by a roll 53, a moisture-hardening polyurethane (adhesive layer) is coated on the skin layer by a doctor blade 505 at the coating wheel 54, and a base fabric 57 wound around the roll 56 is adhered on the adhesive layer by a lamination roll 55 and then wound to form a product 58.
Referring now to fig. 6, fig. 6 is a schematic view of the method of the present invention for manufacturing breathable synthetic leather using waterborne polyurethane, single solvent polyurethane or conventional multi-solvent polyurethane as the raw material of the leather layer. The release paper 601 wound on a roller 60 is conveyed to an oven 63 through rollers 61 and 62, the water-based polyurethane or single-solvent polyurethane or traditional multi-solvent polyurethane dissolved into a solution is coated on the release paper 601 by a scraper 604 at the roller 62 to form a skin film layer, the release paper 602 coated with the polyurethane is conveyed into the oven for drying, and then is conveyed to a laminating roller 66 after being cooled and rolled by a cooling roller 64. On the other hand, the base cloth 69 wound around the roll 67 is sent to the coating wheel 65, and at the coating wheel 65, moisture-hardening polyurethane (adhesive layer) is coated on the base cloth 69 via a doctor blade 605, and is joined and laminated via the laminating roll 66 with the polyurethane-coated release paper 602 sent to the laminating roll 66 at the same time, and is wound into the product 68.
Referring to fig. 7, fig. 7 is a schematic view of the method of the present invention for manufacturing a breathable synthetic leather by using a porous polymer film as a leather film layer. The porous polymer film 701 wound around the roller 70 is fed to the coating roller 72 through the roller 71, the moisture-curable polyurethane (adhesive layer) is coated on the porous polymer film 701 at the coating roller 72 by the doctor blade 705, and the base fabric 77 wound around the roller 76 is adhered to the adhesive layer through the laminating roller 75 and then wound to obtain the product 78.
The present invention is described in detail below with reference to examples, which are only illustrative of the method of the present invention and are not intended to limit the scope of the present invention.
Example 1
A breathable synthetic leather was produced by the procedure shown in FIG. 2, in which a multi-solvent polyurethane (GN-637, Novotex, Italy; containing an ethylene oxide linkage) was diluted with DMF to give a solution having a solid content of 18 wt%, and then coated on a release paper with a doctor blade (knife coater) to a dry film thickness of 10 strips (0.1mm), and dried at 80 ℃ and 140 ℃ for 1 minute, respectively, to form a leather layer. Then, the moisture-hardening polyurethane (NP-2114T of H.P. Fuller, USA) is heated to 120 ℃ liquid polyurethane by a melting machine (Norda) under the state of moisture isolation, then the liquid moisture-hardening polyurethane is conveyed to a coating machine (Norda) by a pump, the liquid moisture-hardening polyurethane is glued on the leather film layer by a doctor blade roll coating point-like coating mode, the thickness is 5 strips (0.05mm), a wet polyurethane synthetic leather (substrate layer) is pasted by a rolling wheel, after cooling, the release paper is peeled off, and the breathable synthetic leather A is obtained after standing for 2 hours at room temperature.
Example 2
A breathable synthetic leather was produced by the procedure shown in FIG. 2, by first diluting a conventional solvent-based (DMF, MEK, toluene, EAC, etc.) polyurethane (S-3030, Inc., Dayu; containing an ethylene oxide segment) with a solvent to prepare a solution having a solid content of 20 wt%. The multi-solvent type polyurethane was coated on a release paper with a doctor blade to a dry film thickness of 18 strips, and dried at 80 ℃ and 140 ℃ for 1 minute, respectively, to form a skin layer. Then, the moisture-hardening polyurethane (NP-2114T of H.P. Fuller, USA) is heated by a melting machine (Norda) to be liquid polyurethane at 120 ℃, then the moisture-hardening polyurethane is coated on the leather film layer in a point-like manner by a scraper, the thickness is 0.05mm, then a wet polyurethane synthetic leather (substrate layer) is attached by a rolling wheel, after cooling, the release paper is peeled off, and the leather is kept stand for 2 hours at room temperature to obtain the breathable synthetic leather B.
Example 3
The breathable synthetic leather was manufactured by the procedure shown in fig. 3, in which moisture-curable polyurethane (0320 from Invoc; containing ethylene oxide segments) was heated to 120 ℃ liquid polyurethane by a melting machine (Norda), and then coated on release paper with a doctor blade to a dry film thickness of 3 strips, after which a film (leather layer) was formed, and then liquid moisture-curable polyurethane (0320 from Invoc) was roll-coated on the leather layer with a doctor blade to a thickness of 0.05mm, and then a wet polyurethane synthetic leather (substrate layer) was attached with a roll roller, and after cooling, the release paper was peeled off, and left to stand at room temperature for 2 hours, thereby obtaining the breathable synthetic leather C of the present invention.
Example 4
An air-permeable synthetic leather was produced by the procedure shown in fig. 7, in which moisture-curable polyurethane (NP-2114T, h.p. fuller, usa) was first heated to 120 ℃ liquid polyurethane by a melting machine (Norda corporation), and then applied in a dot-like manner to a porous polymer film (skin layer; gortex r, w.l. gore, usa) with a thickness of 0.05mm by doctor blade roll coating, and a wet polyurethane synthetic leather (base layer) was then applied by a roll roller. And standing for 2 hours at room temperature after cooling to obtain the breathable synthetic leather D.
Evaluation of synthetic leather Properties
The commercially available synthetic leather (product CS-A05, Co., Ltd.) and the air-permeable synthetic leather A obtained in example 1 were tested for moisture permeability by the method of JIS-L-1099, A-1, and the results are shown in Table 1. The results of comparing the properties of the synthetic skins A to D of examples 1 to 4 with those of a conventional PU synthetic skin (PU-7725 manufactured by Takiku chemical Co., Ltd.; obtained by directly bonding a thermoplastic Polyurethane (PU) as a skin layer to a substrate layer) are shown in Table 2.
Table 1: air permeability test results of synthetic leather
| General grade synthetic leather (Co-Send CS-A05) | Synthetic leather A of example 1 | |
| Moisture permeability (g-H2O/m2·24hr) | 746 | 3640 |
Table 2: comparison of synthetic leather Properties
| Market tradition Finished skin (Taijing chemistry) PU-7725) | Example 1 of Synthetic leather A | Example 2 of Synthetic leather B | Example 3 of Synthetic leather C | Example 4 of Synthetic leather D | |
| Water pressure resistance* (mmH2O) | ＜2,000 | ＞10,000 | ＞5,000 | ＞10,000 | ＞5,000 |
| Moisture permeability (g-H2O/m2· 24hr) | 2,000 | 3,640 | 2,150 | 2,580 | 8,500 |
Note:
the water pressure resistance (hydraulic pressure test) is tested according to the method of JIS-L-1092, and is that the synthetic leather is placed at the outlet of water column of water pressure resistance instrument, the water column is gradually pressurized by pump until the synthetic leather has three water drops, and the water column pressure is the water pressure resistance pressure.
As can be seen from tables 1 and 2, the breathable synthetic leather goods of the present invention have high breathability (moisture permeability of more than 2,000 g-H)2O/m224hr) and at the same time a high water pressure resistance (greater than 5,000 mmH)2O), is superior to the traditional polyurethane synthetic leather; in addition, because no solvent is used, the manufacturing method of the invention can greatly reduce the pollution to the air, is beneficial to achieving the aim of environmental protection, and can reduce the drying step of evaporating the solvent, thereby accelerating the production rate and reducing the production cost.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (20)
1. A method for manufacturing breathable synthetic leather, comprising the following steps:
(a) forming a polyurethane coating layer or a porous polymer coating layer selected from the group consisting of particle hot melt polyurethane, ultraviolet hardening polyurethane, multi-solvent polyurethane, single-solvent polyurethane, waterborne polyurethane and moisture hardening polyurethane, wherein the polyurethane of the coating layer has a hydrophilic bond segment;
(b) coating moisture-hardening polyurethane or hydrophilic moisture-hardening polyurethane on the skin layer in a comprehensive gluing mode or a discontinuous gluing mode to serve as a bonding layer, wherein when the moisture-hardening polyurethane is non-hydrophilic, the moisture-hardening polyurethane is coated in a discontinuous gluing mode; and
(c) and adhering a breathable base material layer to the bonding layer.
2. A method for manufacturing breathable synthetic leather, comprising the following steps:
(a) forming a polyurethane coating layer or a porous polymer coating layer selected from the group consisting of particle hot melt polyurethane, ultraviolet hardening polyurethane, multi-solvent polyurethane, single-solvent polyurethane, waterborne polyurethane and moisture hardening polyurethane, wherein the polyurethane of the coating layer has a hydrophilic chain segment;
(b) coating moisture-hardening polyurethane or hydrophilic moisture-hardening polyurethane on an air-permeable substrate layer in a comprehensive gluing mode or a discontinuous gluing mode to serve as a bonding layer, wherein when the moisture-hardening polyurethane is non-hydrophilic, the moisture-hardening polyurethane is coated in a discontinuous gluing mode; and
(c) and adhering the substrate layer coated with the bonding layer with the coating layer.
3. A method according to claim 1 or 2 wherein the hydrophilic property is that the polyurethane has 5 to 40% by weight of ethylene oxide segments based on the molecular weight of the polyurethane being 100%.
4. A method according to claim 1 or 2 wherein the hydrophilic property is that the polyurethane has 5 to 25% by weight of ethylene oxide segments based on the molecular weight of the polyurethane being 100%.
5. The method of claim 1 or 2, wherein step (a) further comprises applying the polyurethane to a release paper or a release film to form the skin layer.
6. The method of claim 5 wherein the release paper or film is selected from the group consisting of polyethylene and silicone release on kraft paper, reinforced kraft paper, silicone release on white grey paper and silicone-containing release on plastic film.
7. The method of claim 1 or 2, wherein step (a) further comprises applying the polyurethane to a release paper or a release film by roll coating, spray coating, curtain coating, or impregnation.
8. The method of claim 7, wherein step (a) further comprises roll coating the polyurethane onto a release paper or a release film.
9. The method of claim 7, wherein the step (a) further comprises diluting the multi-solvent polyurethane, the single-solvent polyurethane or the aqueous polyurethane in a suitable solvent to a solution having a solid content of 10 to 30 wt%, and coating the solution on a release paper or a release film.
10. The method as set forth in claim 9, wherein said coating viscosity is 1,000-3,000 centipoise and the coating thickness is 0.02-0.3 mm.
11. The method as set forth in claim 9, further comprising two-stage drying at 60-100 ℃ and 120-160 ℃ for 1-10 minutes followed by cooling.
12. The method of claim 1 or 2, wherein the step (a) further comprises applying the uv-curable polyurethane to a release paper or a release film and irradiating with uv rays.
13. The method as set forth in claim 1 or 2, wherein the step (b) further comprises coating the solid moisture-hardening polyurethane or the hydrophilic moisture-hardening polyurethane after melting, wherein the coating temperature is 100-.
14. The method of claim 13, wherein the solid moisture-hardening polyurethane or hydrophilic moisture-hardening polyurethane is melted and then applied to the skin layer or the adhesive layer by roll coating, slit coating, spray coating or dot printing.
15. A method according to claim 1 or 2, wherein said discontinuous sizing comprises spot sizing, void sizing or fish scale sizing.
16. The method of claim 1 or 2, wherein the substrate layer is selected from the group consisting of a base fabric, a wet polyurethane synthetic leather, a betelnut leather, and an animal leather.
17. The method of claim 16, wherein the substrate is selected from the group consisting of industrial fabrics, woven nonwovens, knitted nonwovens, microfiber fabrics, and porous polymeric membranes.
18. The method according to claim 1 or 2, wherein the porous polymer film is a tetrafluoroethylene film or a polyester film.
19. The method according to claim 18, wherein the porous polymer coating has a pore size of 0.04 to 3 μm.
20. The method according to claim 1 or 2, further comprising (d) a step of hardening the substrate layer to which the coating layer is adhered in a steam bath or a steam bath containing an ammonia derivative.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01141618 CN1410625A (en) | 2001-09-28 | 2001-09-28 | Manufacturing method of synthetic leather possessing air permeability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01141618 CN1410625A (en) | 2001-09-28 | 2001-09-28 | Manufacturing method of synthetic leather possessing air permeability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1410625A true CN1410625A (en) | 2003-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01141618 Pending CN1410625A (en) | 2001-09-28 | 2001-09-28 | Manufacturing method of synthetic leather possessing air permeability |
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| CN (1) | CN1410625A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305665C (en) * | 2004-02-20 | 2007-03-21 | 松下电工株式会社 | Built-in board and its coreboard and making method of coreboard |
| CN102113720A (en) * | 2011-03-31 | 2011-07-06 | 渤扬复合面料科技(昆山)有限公司 | Waterproof, gas-permeable and light-emitting cloth with bacteriostatic coating |
| CN102514817A (en) * | 2011-12-22 | 2012-06-27 | 内蒙古伊利实业集团股份有限公司 | Packing material capable of improving humidity resistance of frozen drinks and production method of packing material |
| CN102877321A (en) * | 2012-09-28 | 2013-01-16 | 浙江拓空实业有限公司 | Coating method of two-component polyurethane synthetic leather and coating machine special for two-component polyurethane synthetic leather |
| CN103015221A (en) * | 2012-12-20 | 2013-04-03 | 陕西科技大学 | Production method of waterborne polyurethane synthetic leather based on steam solidification |
| CN105034465A (en) * | 2015-08-14 | 2015-11-11 | 江苏鼎新印染有限公司 | Ventilation fabricoid cloth |
| CN105088808A (en) * | 2015-10-03 | 2015-11-25 | 海宁森德皮革有限公司 | Anti-yellowing split door panel leather |
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2001
- 2001-09-28 CN CN 01141618 patent/CN1410625A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305665C (en) * | 2004-02-20 | 2007-03-21 | 松下电工株式会社 | Built-in board and its coreboard and making method of coreboard |
| CN102113720A (en) * | 2011-03-31 | 2011-07-06 | 渤扬复合面料科技(昆山)有限公司 | Waterproof, gas-permeable and light-emitting cloth with bacteriostatic coating |
| CN102113720B (en) * | 2011-03-31 | 2013-10-09 | 渤扬复合面料科技(昆山)有限公司 | Waterproof, gas-permeable and light-emitting cloth with bacteriostatic coating |
| CN102514817A (en) * | 2011-12-22 | 2012-06-27 | 内蒙古伊利实业集团股份有限公司 | Packing material capable of improving humidity resistance of frozen drinks and production method of packing material |
| CN102514817B (en) * | 2011-12-22 | 2014-03-12 | 内蒙古伊利实业集团股份有限公司 | Packing material capable of improving humidity resistance of frozen drinks and production method of packing material |
| CN102877321A (en) * | 2012-09-28 | 2013-01-16 | 浙江拓空实业有限公司 | Coating method of two-component polyurethane synthetic leather and coating machine special for two-component polyurethane synthetic leather |
| CN102877321B (en) * | 2012-09-28 | 2014-06-25 | 浙江拓空实业有限公司 | Coating method of two-component polyurethane synthetic leather and coating machine special for two-component polyurethane synthetic leather |
| CN103015221A (en) * | 2012-12-20 | 2013-04-03 | 陕西科技大学 | Production method of waterborne polyurethane synthetic leather based on steam solidification |
| CN103015221B (en) * | 2012-12-20 | 2014-06-04 | 陕西科技大学 | Production method of waterborne polyurethane synthetic leather based on steam solidification |
| CN105034465A (en) * | 2015-08-14 | 2015-11-11 | 江苏鼎新印染有限公司 | Ventilation fabricoid cloth |
| CN105088808A (en) * | 2015-10-03 | 2015-11-25 | 海宁森德皮革有限公司 | Anti-yellowing split door panel leather |
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