CN117866279A - Novel waterproof moisture permeable membrane, novel waterproof moisture permeable membrane compound and preparation process thereof - Google Patents
Novel waterproof moisture permeable membrane, novel waterproof moisture permeable membrane compound and preparation process thereof Download PDFInfo
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- CN117866279A CN117866279A CN202311786571.8A CN202311786571A CN117866279A CN 117866279 A CN117866279 A CN 117866279A CN 202311786571 A CN202311786571 A CN 202311786571A CN 117866279 A CN117866279 A CN 117866279A
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Classifications
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- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
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- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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Abstract
The invention belongs to the technical field of protective clothing, and particularly relates to a novel waterproof moisture-permeable membrane, a novel waterproof moisture-permeable membrane compound and a preparation process thereof, wherein the novel waterproof moisture-permeable membrane compound comprises at least one layer of thermoplastic porous moisture-permeable membrane layer and at least one layer of thermosetting non-porous moisture-permeable membrane layer, the gram weight of the thermosetting non-porous moisture-permeable membrane layer is 0.1-2.0 times that of the thermoplastic porous moisture-permeable membrane layer, the thermosetting non-porous moisture-permeable membrane layer is implemented on at least one surface of the thermoplastic porous moisture-permeable membrane layer through an extrusion or coating process before solidification, and the thermosetting non-porous moisture-permeable membrane layer is a polyurethane membrane layer. The novel waterproof moisture-permeable membrane and the novel waterproof moisture-permeable membrane compound and the preparation process thereof lead the waterproof moisture-permeable membrane to have good hydrostatic pressure resistance through the mode of interval compounding of the thermoplastic porous moisture-permeable membrane layer and the thermosetting non-porous moisture-permeable membrane layer, and simultaneously, the waterproof moisture-permeable membrane and the novel waterproof moisture-permeable membrane compound have no micropore defect, and the waterproof moisture-permeable membrane and the novel waterproof moisture-permeable membrane compound have good moisture permeability and barrier property, so that the protective clothing has good protective effect.
Description
Technical Field
The invention relates to the technical field of protective clothing, in particular to a novel waterproof moisture permeable membrane, a novel waterproof moisture permeable membrane compound and a preparation process thereof.
Background
Most conventional surgical gowns or protective clothing contain at least one layer of film and at least one layer of fabric, wherein the film mainly plays a role in blocking, and the fabric plays a role in reinforcing and protecting the film.
According to the classification of the protection class, AAMI4 is the highest protection class of surgical gowns, which must be reached by critical parts of the gown, in addition to the material itself, i.e. these critical parts pass the antiviral penetration test respectively, so that the stringent barrier properties must be achieved by means of two types of high quality barrier films: namely microporous membranes (microporosus films) and non-porous moisture permeable membranes (monolithics films). Microporous membranes are typically formed by mechanical stretching to separate the high molecular weight polymer from the inorganic salt particles filled therein, thereby forming an infinite number of microporous structures. When the degree of stretching is increased to a suitable degree, the film attains a suitable degree of moisture permeability. However, the pore size and pore size distribution of such films are difficult to control. The film has larger micropores formed in local areas and lower barrier property. For this reason, one generally ensures high barrier properties at the expense of moisture permeability (wearing comfort). In contrast, a non-porous, moisture permeable membrane is continuous and free of micropores by chemisorption of some of the surrounding gas and water molecules, followed by diffusion transfer through the membrane thickness and release on the opposite surface. Such films provide excellent moisture vapor transmission and barrier properties, but are expensive to manufacture, and thus there remains a need in the art for a novel waterproof moisture vapor transmission film, novel waterproof moisture vapor transmission film composite, and process for making the same that meets these functional requirements.
Disclosure of Invention
The invention mainly aims to provide a novel waterproof moisture-permeable membrane, a novel waterproof moisture-permeable membrane compound and a preparation process thereof, which can solve the problems in the prior art.
In order to achieve the above object, the novel waterproof moisture-permeable membrane provided by the invention comprises at least one thermoplastic porous moisture-permeable membrane layer and at least one thermosetting non-porous moisture-permeable membrane layer, wherein the gram weight of the thermosetting non-porous moisture-permeable membrane layer is 0.1-2.0 times that of the thermoplastic porous moisture-permeable membrane layer, and the thermosetting non-porous moisture-permeable membrane layer is implemented on at least one surface of the thermoplastic porous moisture-permeable membrane layer through extrusion or coating process before curing.
Preferably, the thermoplastic porous moisture-permeable membrane comprises at least one thermoplastic porous moisture-permeable membrane layer and at least one thermosetting non-porous moisture-permeable membrane layer, wherein the thermosetting non-porous moisture-permeable membrane layer is directly or indirectly sandwiched between the at least one thermoplastic porous moisture-permeable membrane layer.
Preferably, the thermoplastic porous moisture-permeable membrane comprises at least one thermoplastic porous moisture-permeable membrane layer and at least one thermosetting non-porous moisture-permeable membrane layer, wherein the thermoplastic porous moisture-permeable membrane layer is directly or indirectly sandwiched by at least one thermosetting non-porous moisture-permeable membrane layer.
Preferably, the thermosetting nonporous moisture-permeable membrane layer is a polyurethane membrane layer, and the thermosetting nonporous moisture-permeable membrane layer is formed by forming a continuous reaction type polyurethane hot melt adhesive film on at least one surface of the thermoplastic porous moisture-permeable membrane layer through a roller coating or knife coating process and then performing a curing reaction with environmental water vapor.
Preferably, the thermoplastic porous moisture-permeable film layer is prepared by a casting process or a blow molding process.
Preferably, the thickness of the composite of the thermoplastic porous moisture-permeable membrane layer and the thermosetting non-porous moisture-permeable membrane layer is between 10 and 100 mu m.
Preferably, the gram weight of the composite of the thermoplastic porous moisture-permeable film layer and the thermosetting non-porous moisture-permeable film layer is 10gsm to 70gsm.
The invention provides a novel waterproof moisture-permeable membrane preparation process, which comprises the following steps:
s1, preparing a thermoplastic porous moisture-permeable film layer through a tape casting process or a blow molding process;
s2, forming a continuous reactive polyurethane hot melt adhesive film on at least one surface of the thermoplastic porous moisture-permeable film layer through a roller coating or blade coating process;
s3, allowing the reactive polyurethane hot melt adhesive film to undergo a curing reaction with environmental water vapor in a proper temperature, humidity and time range to form a thermosetting nonporous moisture-permeable film layer.
The novel waterproof and moisture-permeable membrane compound comprises a thermosetting nonporous and moisture-permeable membrane layer and a thermoplastic nonporous and moisture-permeable membrane layer, wherein at least one side of the thermosetting nonporous and moisture-permeable membrane layer is bonded with the thermosetting nonporous and moisture-permeable membrane layer, one side of the thermoplastic nonporous and moisture-permeable membrane layer away from the thermosetting nonporous and moisture-permeable membrane layer is bonded with a hot melt adhesive layer, one side of the hot melt adhesive layer away from the thermoplastic nonporous and moisture-permeable membrane layer is bonded with a fiber material layer, and one side of the fiber material layer away from the hot melt adhesive layer is provided with an adhesive, so that continuous bonding of the fiber material layer is facilitated.
The invention provides a novel preparation process of a compound of a waterproof and moisture-permeable membrane, which comprises the following steps:
s1, preparing a thermoplastic porous moisture-permeable film layer through a tape casting process or a blow molding process;
s2, applying an adhesive on one surface of the fiber material, and forming a double-layer compound with the thermoplastic porous moisture-permeable film layer;
s3, forming a continuous reactive polyurethane hot melt adhesive film on the film surface of the double-layer compound through a roller coating or knife coating process;
s4, allowing the reactive polyurethane hot melt adhesive film to undergo a curing reaction with environmental water vapor in a proper temperature, humidity and time range to form a thermosetting nonporous moisture-permeable film layer.
The invention provides a novel waterproof moisture permeable membrane, a novel waterproof moisture permeable membrane compound and a preparation process thereof. The beneficial effects are as follows:
(1) The novel waterproof moisture-permeable membrane, the novel waterproof moisture-permeable membrane compound and the preparation process thereof enable the waterproof moisture-permeable membrane to have good hydrostatic pressure resistance through the mode of spaced compounding of the thermoplastic porous moisture-permeable membrane layer and the thermosetting non-porous moisture-permeable membrane layer, and meanwhile, the waterproof moisture-permeable membrane and the novel waterproof moisture-permeable membrane compound have no micropore defects, and the waterproof moisture-permeable membrane and the novel waterproof moisture-permeable membrane compound provide good moisture permeability and barrier performance, so that the protective clothing has good protective effect.
(2) The novel waterproof moisture-permeable membrane and the novel waterproof moisture-permeable membrane compound are prepared by a tape casting process or a blow molding process, and then a continuous reaction type polyurethane hot melt adhesive film is formed on at least one surface of the thermoplastic porous moisture-permeable membrane layer by a roll coating or a knife coating process, and then a thermosetting nonporous moisture-permeable membrane layer is formed by a curing reaction with environmental water vapor, so that the production mode is easy to obtain and the cost is relatively low.
(3) According to the novel waterproof moisture permeable membrane, the novel waterproof moisture permeable membrane compound and the preparation process thereof, the number of layers of the novel waterproof moisture permeable membrane, the novel waterproof moisture permeable membrane compound and the preparation process thereof can be rapidly overlapped according to different requirements, different hydrostatic pressure resistance effects and different moisture permeability are achieved, and the use effects of the novel waterproof moisture permeable membrane, the novel waterproof moisture permeable membrane compound and the preparation process thereof are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a novel waterproof moisture-permeable membrane according to an embodiment of the present invention;
FIG. 2 is a schematic view of a novel waterproof and moisture-permeable membrane according to a second embodiment of the present invention;
FIG. 3 is a schematic view showing the structure of a novel waterproof and moisture-permeable membrane according to a third embodiment of the present invention;
FIG. 4 is a schematic structural view of the novel waterproof moisture permeable membrane composite of the present invention;
FIG. 5 is a schematic illustration of another construction of the novel waterproof moisture permeable membrane composite of the present invention;
FIG. 6 is a graph of an example performance test of a composite of the present invention.
Reference numerals illustrate:
1. a thermoplastic porous membrane layer; 2. a thermosetting nonporous moisture permeable film layer; 3. a hot melt adhesive layer; 4. a layer of fibrous material.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, the present invention provides a novel waterproof moisture-permeable membrane, comprising at least one thermoplastic porous moisture-permeable membrane layer 1 and at least one thermosetting non-porous moisture-permeable membrane layer 2, wherein the gram weight of the thermosetting non-porous moisture-permeable membrane layer 2 is 0.1-2.0 times that of the thermoplastic porous moisture-permeable membrane layer 1, the thermosetting non-porous moisture-permeable membrane layer 2 is implemented on at least one surface of the thermoplastic porous moisture-permeable membrane layer 1 by extrusion or coating process before curing, the thickness of the composite formed by the thermoplastic porous moisture-permeable membrane layer 1 and the thermosetting non-porous moisture-permeable membrane layer 2 is between 10 μm and 100 μm, and the polymer of the thermoplastic porous moisture-permeable membrane layer 1 comprises at least one of the following: the gram weight of the thermoplastic porous moisture-permeable film layer 1 compounded by polyethylene, polypropylene, polyester, polyamide and the like and the thermosetting nonporous moisture-permeable film layer 2 is 10-70 gsm, the gram weight of the single-layer thermosetting nonporous moisture-permeable film layer 2 is not more than 50% of the weight of the single-layer thermoplastic porous film layer 1, the thermosetting nonporous moisture-permeable film layer 2 is a polyurethane film layer, the thermoplastic porous moisture-permeable film layer 1 is prepared through a casting process or a blowing process, and then a continuous reactive polyurethane hot melt adhesive film is formed on at least one surface of the thermoplastic porous moisture-permeable film layer 1 through a roller coating process or a knife coating process and then is subjected to a curing reaction with environmental water vapor to form the thermosetting polyurethane film layer.
Example two
On the basis of the first embodiment, the novel waterproof moisture-permeable membrane comprises at least one thermoplastic porous moisture-permeable membrane layer 1 and at least one thermosetting nonporous moisture-permeable membrane layer 2, wherein the thermosetting nonporous moisture-permeable membrane layer 2 is directly or indirectly clamped with the at least one thermoplastic porous moisture-permeable membrane layer 1.
Example III
On the basis of the first embodiment, the novel waterproof moisture-permeable membrane comprises at least one thermoplastic porous moisture-permeable membrane layer 1 and at least one thermosetting nonporous moisture-permeable membrane layer 2, wherein the thermoplastic porous moisture-permeable membrane layer 1 is directly or indirectly clamped with the at least one thermosetting nonporous moisture-permeable membrane layer 2.
Through embodiment two and embodiment three, change the number of piles and the stack mode of thermoplastic porous wet film layer 1 and the wet film layer 2 of the wet film of thermosetting nonporous, can reach different hydrostatic pressure resistance and moisture permeability, improve the result of use of this novel waterproof wet film.
The invention provides a novel waterproof moisture-permeable membrane preparation process, which comprises the following steps:
s1, preparing a thermoplastic porous moisture-permeable film layer 1 through a tape casting process or a blow molding process;
s2, forming a continuous reactive polyurethane hot melt adhesive film on at least one surface of the thermoplastic porous moisture-permeable film layer 1 through a roller coating or blade coating process;
s3, allowing the reactive polyurethane hot melt adhesive film to undergo a curing reaction with environmental water vapor in a proper temperature, humidity and time range to form the thermosetting nonporous moisture-permeable film layer 2.
The invention provides a novel waterproof and moisture-permeable membrane compound, which comprises a thermosetting nonporous and moisture-permeable membrane layer 2 and a thermoplastic porous and moisture-permeable membrane layer 1, wherein at least one side of the thermosetting nonporous and moisture-permeable membrane layer 2 is bonded with the thermosetting nonporous and moisture-permeable membrane layer 2, one side of the thermoplastic porous and moisture-permeable membrane layer 1, which is far away from the thermosetting nonporous and moisture-permeable membrane layer 2, is bonded with a hot melt adhesive layer 3, and one side of the hot melt adhesive layer 3, which is far away from the thermoplastic porous and moisture-permeable membrane layer 1, is bonded with a fiber material layer 4, wherein an adhesive is arranged on one side of the fiber material layer, which is far away from the hot melt adhesive layer, so that continuous bonding of the fiber material layer is facilitated.
The processing steps of the novel waterproof and moisture-permeable membrane compound are as follows:
s1, preparing a thermoplastic porous moisture-permeable film layer 1 through a tape casting process or a blow molding process;
s2, applying an adhesive on one surface of the fiber material, and forming a double-layer compound with the thermoplastic porous moisture-permeable film layer 1;
s3, forming a continuous reactive polyurethane hot melt adhesive film on the film surface of the double-layer compound through a roller coating or knife coating process;
s4, allowing the reactive polyurethane hot melt adhesive film to undergo a curing reaction with environmental water vapor in a proper temperature, humidity and time range to form the thermosetting nonporous moisture-permeable film layer 2.
In order to know the performances of the novel waterproof moisture-permeable membrane, the novel waterproof moisture-permeable membrane compound and the preparation process thereof, the novel waterproof moisture-permeable membrane compound and the preparation process thereof are subjected to performance detection, and the specific steps are as follows:
experiment comparison 1
The polyethylene-calcium carbonate blend particles were taken with a melting temperature of 185℃and a volumetric melt flow of 10cm when tested according to ISO 1133 3 10 minutes, specific gravity 1.72g/cm 3 The combination of materials was extruded through a single screw extruder to a 3.5 meter wide cast film die equipped with a combination module and set at a temperature of 235 ℃ ± 2 ℃, after film extrusion, 300% stretching in the machine direction at 82 ℃ ± 2 ℃ to form a breathable microporous film having an average grammage of 15gsm, the key characteristics being listed in table 1 and identified as "sample 1A".
Experiment comparison 2
A 15gsm breathable microporous film of experimental comparative 1 was used, having first and second surfaces. Wherein 1.5gsm of hot melt adhesive was applied by adhesive spraying between the second surface and 22gsm SMS nonwoven, the sizing temperature = 161 ℃, forming a film/SMS composite, and identified as "sample 2A"
Experimental example 3
A 15gsm breathable microporous film of experimental comparative 1 was used. The microporous membrane has first and second surfaces. Wherein the second surface is laminated with the 22gsm SMS nonwoven in two layers without any adhesive applied between the two layers so that the first surface of the microporous film can be uniformly coated with a layer of PUR hot melt adhesive film. This example uses PUTECH3329, manufactured by Dongguan polymeric materials technology Co., ltd., density=1.05 g/cc coating roll temperature 100℃and coating line speed 160m/min. By adjusting the speed ratio of the sizing roller, the gram weight of the adhesive film is adjusted. Then, the two-layer stack of the microporous membrane/SMS coated with the adhesive film and a release film are combined after 75PSI pressure to form a four-layer structure, and then wound on a standard paper tube with a diameter of 3 inches to form a sample roll, and the sample roll is stored at 25 ℃ in an environment with a relative humidity of 65% to be cured for 1 day, preferably 3 days, and more preferably 5 days, and the curing reaction is completed. And rewinding the cured 4-layer sample roll. The SMS layer can be easily separated because no adhesive is applied between the microporous membrane and the SMS. The release paper layer can also be easily separated because the partially cured PU film cannot adhere to the release paper. The microporous membrane and the cured PU membrane are firmly combined to form a water-repellent and moisture-permeable double-layer film containing a thermoplastic porous membrane layer and a thermosetting nonporous membrane layer. And respectively collecting the SMS, the release paper film and the water-repellent and moisture-permeable double-layer film in the rewinding process. In the coating process, the gram weight of the adhesive film is changed by adjusting the rotation speed ratio of the sizing roller, so that the double-layer films 3A,3B and 3C are prepared.
Experimental example 4
A 15gsm breathable microporous film of experimental comparative 1 was used. The microporous film had first and second surfaces, wherein 1.5gsm of hot melt adhesive was applied by a glue-blown method between the second surface and a 22gsm SMS nonwoven. The two-layer composite of microporous film and SMS described above is fed into a hot melt roll coater so that the first surface of the microporous film can be uniformly coated with a layer of PUR hot melt adhesive film. This example uses PUTECH3329, density=1.05 g/cc, coating temperature 100℃and coating line speed 160m/min, manufactured by Dongguan polymeric materials, inc. By adjusting the rotation speed ratio of the glue applying roller, the gram weight of the glue film is adjusted. The microporous film/SMS two-layer composite coated with the adhesive film is then combined with a release paper at 75PSI to form a 5-layer structure, which is then wound onto a standard 3-inch diameter paper tube to form a sample roll, which is stored at 25 c in an environment with a relative humidity of 65% to cure it for 1 day, preferably 3 days, and more preferably 5 days, to complete the curing reaction. The 5-layer composite after curing contained a water-and moisture-repellent double-layer film of a thermoplastic porous film layer and a thermosetting non-porous film layer. The thermosetting PU polyurethane film layer has the functions of moisture permeability and barrier. And rewinding the 5-layer sample roll after curing. Because the partially cured PU polyurethane film cannot adhere to the release paper, the release paper layer can be easily separated to form a 4-layer composite of SMS-hot melt adhesive-microporous film-cured PU film. The composite contains a water-repellent and moisture-permeable double-layer film of a thermoplastic porous film layer and a thermosetting nonporous polyurethane film layer. In the PUR film coating process, the gram weight of the film is changed by adjusting the rotation speed ratio of the sizing roller, so that the compound samples 4A,4B and 4C with the 4-layer structure are prepared.
Experimental example 5
A 15gsm breathable microporous film of experimental comparative 1 was used, having first and second surfaces. Wherein 1.5gsm of hot melt adhesive was applied between the second surface and the 22gsm SMS nonwoven by a glue-spraying method. The two-layer composite of microporous film and SMS described above is fed into a hot melt roll coater so that the first surface of the microporous film can be uniformly coated with a layer of PUR hot melt adhesive film. This example uses PUTECH3329, density=1.05 g/cc, coating temperature 100℃and coating line speed 160m/min, manufactured by Dongguan polymeric materials, inc. By adjusting the rotation speed ratio of the glue applying roller, the gram weight of the glue film is adjusted. The microporous film/SMS coated film two-layer composite was then combined with a 20gsm SMS layer at 75PSI pressure to form a 5-layer structure, which was wound onto a standard 3 inch diameter paper tube to form a sample roll, which was stored at 25 c in an environment with 65% relative humidity to cure it for 1 day, preferably 3 days, and more preferably 5 days, to complete the curing reaction. The 5-layer composite after curing contained a water-and moisture-repellent bilayer film of a thermoplastic porous film layer and a thermosetting, non-porous polyurethane film layer. The thermosetting polyurethane film layer has the functions of moisture permeability and barrier and also has the function of combining with non-woven fabrics. Composite samples 5a,5b &5c of the 5-layer structure described above were made.
Experimental example 6
A 15gsm breathable microporous film of experimental comparative 1 was used, having first and second surfaces. Wherein 1.5gsm of hot melt adhesive was applied between the second surface and the 22gsm SMS nonwoven by a glue-spraying method. The two-layer composite of microporous film and SMS described above is fed into a hot melt roll coater so that the first surface of the microporous film can be uniformly coated with a layer of PUR hot melt adhesive film. This example uses PUTECH3329, density=1.05 g/cc, manufactured by Dongguan polymeric materials, inc. The coating temperature is 100 ℃, and the coating line speed is 160m/min. By adjusting the rotation speed ratio of the glue applying roller, the gram weight of the glue film is adjusted. The film coated microporous film/SMS two layer composite was then combined with a 15gsm high permeability microporous film at 75PSI pressure to form a 5 layer structure, which was wound onto a standard 3 inch diameter paper tube to form a sample roll and stored at 25 c in a 65% relative humidity environment to cure for 1 day, preferably 3 days, and more preferably 5 days to complete the curing reaction. The 5-layer composite after curing contains a thermoplastic porous film layer and a thermoset, non-porous polyurethane film layer of a water-and moisture-repellent ABA-structured film. The thermosetting polyurethane film layer has the functions of moisture permeability and barrier and also has the function of bonding two layers of microporous films. In the coating process, the gram weight of the adhesive film was changed by adjusting the rotation speed ratio of the sizing roller, and the above 5-layer structured composite samples 6a,6b and 6c were prepared.
Experimental example 7
A 15gsm breathable microporous film of experimental comparative 1 was used, having first and second surfaces. Wherein 1.5gsm of hot melt adhesive was applied between the second surface and the 22gsm SMS nonwoven by a glue-spraying method. The two-layer composite of microporous film and SMS described above is fed into a hot melt roll coater so that the first surface of the microporous film can be uniformly coated with a layer of PUR hot melt adhesive film. The coating temperature is 100 ℃, and the coating line speed is 160m/min. By adjusting the rotation speed ratio of the glue applying roller, the gram weight of the glue film is adjusted. Then the two-layer composite of the microporous film/SMS coated with the adhesive film and the microporous film surface of the other group of the microporous film/SMS two-layer composite are compounded after the pressure of 75PSI, so that the PUR adhesive film is clamped between the two layers of microporous films to form a 6-layer structure, then the structure is wound on a paper tube with the diameter of 3 inches to prepare a sample roll, and the sample roll is stored in an environment with the relative humidity of 65 percent at 25 ℃ to be cured for 1 day, preferably 3 days and more than 5 days, so that the curing reaction is completed. After curing the 6 layer composite will contain a non-porous, water-repellent, moisture-permeable, air-impermeable composite film of ABA structure, with the outer SMS layer and the composite film being bonded by a thermoplastic hot melt adhesive. The A layer of the composite film with the ABA structure is a thermoplastic microporous film, and the B layer is a thermosetting non-porous moisture-permeable polyurethane film. The multilayer composites 7A,7B and 7C obtained in this example.
Experiment comparison 8
With the 20gsm SMS nonwoven fabric of example 5, the fiber fineness of the SB layer of the SMS is typically 10-15 microns, the grammage of the two SB layers is 60% -95% of the total grammage of the SMS, the fiber fineness of the M layer is typically 0.5-10 microns, and the grammage of the M layer is 5% -40% of the total grammage of the SMS. The SMS has a first surface (embossed side) and a second surface (smooth side). The SMS is fed into a hot melt roll coater so that the second surface of the SMS can be uniformly coated with a layer of PUR hot melt adhesive film and compounded with a layer of release paper. The coating temperature is 100 ℃, and the coating line speed is 160m/min. By adjusting the speed ratio of the sizing roller, the gram weight of the adhesive film is adjusted. The above composite is compounded by applying 75PSI pressure to form a 3-layer structure, and then wound on a standard 3-inch diameter paper tube to form a sample roll, which is stored at 25℃ in an environment with a relative humidity of 65% and allowed to cure for 1 day, preferably 3 days, and more preferably 5 days, to complete the curing reaction. The 3-layer composite after curing contained a thermoplastic porous fibrous membrane layer and a water-and moisture-repellent, two-layer film of a thermoset polyurethane membrane skin layer. And rewinding the 3-layer sample roll after curing. Separating the release paper on the outer layer from the middle film layer. And respectively collecting the release paper layer and the intermediate film layer to prepare the water-repellent and moisture-permeable double-layer composites 8A and 8B.
Referring to fig. 6, the novel waterproof moisture-permeable membrane composite and the preparation process thereof prepared by the invention have good hydrostatic pressure resistance, and have no micropore defect through pinhole test, and still have a certain moisture permeability.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. The novel waterproof moisture-permeable membrane comprises at least one thermoplastic porous moisture-permeable membrane layer (1) and at least one thermosetting non-porous moisture-permeable membrane layer (2), and is characterized in that: the gram weight of the thermosetting nonporous moisture-permeable film layer (2) is 0.1 to 2.0 times that of the thermoplastic porous moisture-permeable film layer (1), and the thermosetting nonporous moisture-permeable film layer (2) is applied on at least one surface of the thermoplastic porous moisture-permeable film layer (1) by an extrusion or coating process before curing.
2. A novel water-proof moisture-permeable membrane according to claim 1, characterized in that it comprises at least one thermoplastic porous moisture-permeable membrane layer (1) and at least one thermosetting non-porous moisture-permeable membrane layer (2), wherein at least one thermoplastic porous moisture-permeable membrane layer (1) is directly or indirectly sandwiched between the thermosetting non-porous moisture-permeable membrane layers (2).
3. A novel water-proof moisture-permeable membrane according to claim 1, characterized in that it comprises at least one thermoplastic porous moisture-permeable membrane layer (1) and at least one thermosetting non-porous moisture-permeable membrane layer (2), wherein at least one thermosetting non-porous moisture-permeable membrane layer (2) is directly or indirectly sandwiched between the thermoplastic porous moisture-permeable membrane layers (1).
4. A novel water-resistant moisture-permeable film according to claim 1, characterized in that: the thermosetting nonporous moisture-permeable membrane layer (2) is a polyurethane membrane layer, and the thermosetting nonporous moisture-permeable membrane layer (2) is formed by forming a continuous reaction type polyurethane hot melt adhesive film on at least one surface of the thermoplastic porous moisture-permeable membrane layer (1) through a roller coating or knife coating process and then performing a curing reaction with environmental water vapor.
5. A novel water-resistant moisture-permeable film according to claim 1, characterized in that: the thermoplastic porous moisture-permeable film layer (1) is prepared by a tape casting process or a blow molding process.
6. A novel water-resistant moisture-permeable film according to claim 1, characterized in that: the thickness of the composite of the thermoplastic porous moisture-permeable membrane layer (1) and the thermosetting non-porous moisture-permeable membrane layer (2) is between 10 and 100 mu m.
7. A novel water-resistant moisture-permeable film according to claim 1, characterized in that: the gram weight of the composite of the thermoplastic porous moisture-permeable film layer (1) and the thermosetting non-porous moisture-permeable film layer (2) is 10gsm to 70gsm.
8. The process for preparing a novel waterproof and moisture permeable film according to claims 1 to 7, comprising the steps of:
s1, preparing a thermoplastic porous moisture-permeable film layer (1) through a tape casting process or a blow molding process;
s2, forming a continuous reactive polyurethane hot melt adhesive film on at least one surface of the thermoplastic porous moisture-permeable film layer (1) through a roller coating or blade coating process;
s3, allowing the reactive polyurethane hot melt adhesive film to undergo a curing reaction with environmental water vapor in a proper temperature, humidity and time range to form a thermosetting nonporous moisture-permeable film layer (2).
9. A novel waterproof and moisture-permeable membrane composite according to claims 1-8, comprising a thermosetting non-porous and moisture-permeable membrane layer (2) and a thermoplastic porous and moisture-permeable membrane layer (1), characterized in that: at least one side of the thermosetting nonporous moisture-permeable membrane layer (2) is adhered with the thermosetting nonporous moisture-permeable membrane layer (2), one side of the thermoplastic nonporous moisture-permeable membrane layer (1) away from the thermosetting nonporous moisture-permeable membrane layer (2) is adhered with the hot melt adhesive layer (3), and one side of the hot melt adhesive layer (3) away from the thermoplastic nonporous moisture-permeable membrane layer (1) is adhered with the fiber material layer (4).
10. The process for preparing a novel waterproof and moisture-permeable membrane composite according to claim 9, comprising the steps of:
s1, preparing a thermoplastic porous moisture-permeable film layer (1) through a tape casting process or a blow molding process;
s2, applying an adhesive on one surface of the fiber material, and forming a double-layer compound with the thermoplastic porous moisture-permeable film layer (1);
s3, forming a continuous reactive polyurethane hot melt adhesive film on the film surface of the double-layer compound through a roller coating or knife coating process;
s4, allowing the reactive polyurethane hot melt adhesive film to undergo a curing reaction with environmental water vapor in a proper temperature, humidity and time range to form a thermosetting nonporous moisture-permeable film layer (2).
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