Mold for molding polyurethane condom, and preparation method and use method for mold

Abstract

A mold for molding a polyurethane condom, and a preparation method and use method for the mold. The surface roughness of a mold (200) is less than or equal to 0.2. The mold (200) is formed of a thermoplastic polymer, and the surface tension is 10-35 mN / m. The mold (200) for molding a polyurethane condom is prepared by injection molding the thermoplastic polymer. When the mold (200) is used, the mold (200) is suspended vertically and immersed in an emulsion containing a polyurethane resin to obtain an immersed mold (200), the immersed mold (200) is taken out and dried to form a polyurethane film on the surface of the mold (200), and then demolding is performed to obtain a polyurethane condom (100). The condom made by the mold (200) is thin and has excellent softness and strength, and meets product market demands.

Description

Technical FieldThe present disclosure relates to the field of condom materials, and in particular, to amold for molding a polyurethane condom, a method for manufacturing the mold, anda method for using the mold.BackgroundCondoms are simple devices widely used in the world for contraception andprevention of sexually transmitted diseases. The current condom products mainlyinclude natural rubber latex condoms and polyurethane condoms.In the dip molding process for a natural latex rubber condom, a mold made of glass ora metal material such as stainless steel is mainly used. Since the natural latex rubbermaterial has a surface tension close to that of glass and stainless steel, the film formedfrom natural latex rubber on the surfaces of these two materials shows relatively weakadhesion. Furthermore, natural latex rubber has a swelling property in an alkalineenvironment. Therefore, natural latex rubber condoms are demolded by swelling inammonia water after being molded on the surface of a glass mold or a metal mold.However, a condom made of a polyurethane material does not have the swellingproperty of natural latex rubber, and has a surface tension of about 55 mN / m. A driedcoating film thereof has a surface tension of about 45 mN / m. A polyurethane emulsioncan be spread on molds of glass, ceramic, and stainless steel, and a dried waterbornepolyurethane film has very strong adhesion to these molds, causing difficulty inrolling and demolding, preventing these two materials from being directly used fordip molding of polyurethane condoms. In order to solve the problem in molding ofpolyurethane, two methods are currently used in the world: (1) alkylating the glasssurface to bring the surface tension of the glass close to that of a polyurethanematerial, whereby the problem with film formation and demolding of polyurethanematerials on glass can be solved, but the time period available for effective use afteralkylation is as short as about 30 h, not allowing continuous production; and thestability of quality of the polyurethane condom products cannot be effectivelyguaranteed in the production process because the effect of alkylation varies from timeto time; and (2) Pre-coating the surface of glass or stainless steel with a layer of arelease agent, whereby the problem with continuous production can be solved, but therelease agent may be carried into the condom material during the production process,posing a potential risk to the performance and biosafety of the product.Therefore, there is a need for further improvement and optimization of the mold formolding of polyurethane condoms, which also represents a research hotspot anddifficulty in this field.Summary of the inventionThe present invention is made in view of the above-described drawbacks in the priorart. One of the objectives of the present disclosure is to provide a mold for molding apolyurethane condom, and the polyurethane condom is thin and has excellentflexibility and strength, satisfying the market demand for the product.Another objective of the present disclosure is to provide a method for manufacturingthe mold for molding a polyurethane condom.Another objective of the present disclosure is to provide a method for using the moldfor molding a polyurethane condom.The present disclosure provides a mold for molding a polyurethane condom, whichhas a surface roughness of 0.2 or less, and is composed of a thermoplastic polymerhaving a surface tension of 10-35 mN / m.In one embodiment, the thermoplastic polymer is any one selected from polyurethane,polymethyl methacrylate, polystyrene, polyethylene, polyvinyl chloride,polypropylene, polystyrene, acrylonitrile-butadiene-styrene, polyamide,polycarbonate, polyoxymethylene, modified polyphenylene oxide, thermoplasticpolyester, polyimide, polyphenylene sulfide, polysulfones, aromatic polyamides,polyarylate, polyphenyl ester, polyaryletherketone, a liquid crystalline polymer,fluororesin, and materials obtained by organic modification of the above polymers orby inorganic modification by filling the above polymers with an inorganic material, orany combination thereof.In an embodiment, the organic modification is any one selected from organosiliconmodification, organofluorine modification, silane modification, acrylatecopolymerization modification, vinyl monomer modification, and aromatic monomermodification, or any combination thereof.In an embodiment, the inorganic modification is any one selected from heavy calciummodification, talc modification, graphene modification, water glass modification,attapulgite modification, kaolin modification, light calcium modification, and glassmicrobeads modification, and any combination thereof.In one embodiment, the polyurethane condom is a male condom, and the moldcomprising: a head portion, and a tail portion connected to the head portion, whereinthe head portion has a columnar shape with a gradually increasing diameter, and has aslope greater than 0° and less than or equal to 5°.In one embodiment, the head portion has a front end provided with a semen pouch.In one embodiment, the head portion has a length of 200-260 mm.In one embodiment, the head portion is connected to the tail portion via a transitionsection.In one embodiment, the tail portion has a columnar shape with a constant diameter.In one embodiment, the tail portion has a columnar shape with a gradually increasingdiameter, and has a slope greater than 0° and less than or equal to 3°.In one embodiment, the polyurethane condom is a female condom.In one embodiment, the polyurethane condom is a heterotypic condom, and the moldhas a surface provided with floating points or screw threads.In one embodiment, the mold has a thickness of 2-10 mm, or is a solid mold.In one embodiment, when the mold is placed vertically, the mold has an angle lessthan 5° with respect to the vertical line.The present disclosure also provides a method for manufacturing a mold for moldinga polyurethane condom, comprising the steps of:- providing a thermoplastic polymer having a surface tension of 10-30 mN / m;- injection molding the thermoplastic polymer to produce a mold for molding apolyurethane condom;wherein the mold has a surface roughness of 0.2 or less.In one embodiment, the injection molding is carried out by three-shot feed andtwo-stage injection molding.The present disclosure also provides a method for using a mold for molding apolyurethane condom, comprising the steps of:- providing a mold;- providing an emulsion comprising a polyurethane resin;- hanging the mold vertically and dipping it in the emulsion containing thepolyurethane resin to obtain an dipped mold;- removing the dipped mold and drying it to form a polyurethane film on the surfaceof the mold;- demolding;wherein the mold has a surface roughness of 0.2 or less, and is composed of athermoplastic polymer having a surface tension of 10-35 mN / m.In one embodiment, the polyurethane condom has a 100% tensile modulus of 2.5N / mm2 or lower.In one embodiment, the polyurethane condom has a burst pressure of 1 kPa or more, aburst volume of 5 L or more, and a 100% modulus of 3.5 N / mm2 or lower.The polyurethane condom having an adhesive layer provided according to the presentdisclosure is prepared by using a mold for molding the polyurethane condom, whereinthe mold is composed of a thermoplastic polymer having a surface tension of 10-35mN / m, so that the polyurethane can uniformly form a film directly on the surface ofthe mold by dip molding. A film formed therefrom after drying has weak adhesion,allowing uniform demolding without the aid of a release agent, which ensures theuniformity of the polyurethane film and avoids introduction of other substances,thereby sufficiently ensuring the performance and biological safety of thepolyurethane condom product. In addition, according to the mold provided in thepresent disclosure, the polyurethane material can be directly post-treated and shapedon the surface of the mold for raw material properties, without addition of otherprocesses due to demolding, etc., which greatly simplifies the operation procedure,improves the production efficiency and increases the qualification rate of products.The raw materials for the mold of the present disclosure have a low cost and a richsource, and the molding process is simple, safe, and environmentally friendly. Otherfeatures, benefits, and advantages will be apparent from the disclosure detailed herein,including the description and claim.Brief Description of DrawingsThe drawings used in the embodiments will be briefly described below to moreclearly describe the technical solutions in the embodiments of the present disclosure.It is to be understood that the following drawings depict only certain embodiments ofthe invention and are therefore not to be considered limiting its scope. For a person ofordinary skill in the art, other relevant drawings can also be obtained according tothese drawings without paying any inventive effort.Fig. 1 illustrates a schematic structure of the polyurethane condom according to onespecific embodiment of the present disclosure;Fig. 2 illustrates a schematic structure of a mold for molding a polyurethane condomaccording to one specific embodiment of the present disclosure;Fig. 3 illustrates a schematic flow diagram of a method for manufacturing the moldfor molding a polyurethane condom according to one specific embodiment of thepresent application.Detailed Description of the InventionThe technical solutions of the embodiments in the present disclosure will be clearlyand fully described with reference to the accompanying drawings, in order to providea clear understanding of for the objectives, technical solutions and advantages of theembodiments of the present disclosure. Obviously, it is to be understood that thedescribed embodiments are part of, and not all of, the present disclosure. Thecomponents of the embodiments in the present disclosure, which are generallydescribed and illustrated in the drawings herein, can be configured and designed upondifferent needs.As shown in Figs. 1-3, the process for preparing a polyurethane condom 100 includesperforming molding on a mold 200. Specifically, the polyurethane condom 100 isprepared by molding the raw materials for the polyurethane condom 100, such anemulsion including a polyurethane resin, on a mold 200 by dip molding, and thepolyurethane condom 100 has high strength, high compactness, and goodbiocompatibility, may have a thickness of, for example, 0.001 mm to 0.08 mm,preferably 0.05 mm to 0.04 mm, such as 0.01 mm, 0.015 mm, 0.02 mm, and 0.030mm, and can provide a user with a more comfortable experience, and a softer andmore delicate skin feel, without the problem of allergy.The polyurethane condom 100 having a thickness within the above range has a burstpressure of for example 1 kPa or more, preferably 3 kPa or more, for example, 3 kPa,4 kPa, or 5kPa, and a burst volume of for example 5 L or more, for example, 6 L, 8 L,or 10 L.The polyurethane condom 100 may have a strength, e.g. tensile strength, of forexample 30 MPa or more, preferably 70 MPa or more, and a 100% modulus of forexample 3.5 N / mm2 or lower, such as 2 N / mm2, 1.8 N / mm2, 1.5 N / mm2, or 1 N / mm2.It is noteworthy that the emulsion comprising a polyurethane resin has a surfacetension for example in a range of 20-80 mN / m, preferably in a range of 30-60 mN / m,such as 32 mN / m, 40 mN / m, 50 mN / m, 55 mN / m, and 58 mN / m. After being moldedand dried on the surface of the mold 20 provided in the present disclosure, thepolyurethane film has a surface tension in a range of 15-68 mN / m, such as 20 mN / m,28 mN / m, 45 mN / m, or 50 mN / m. Within the above range, the emulsion containingthe polyurethane resin may be uniformly spread on the mold 200, and the dried filmhas low adhesion, thereby ensuring uniform film formation and demolding.In some embodiments, the emulsion comprising a polyurethane resin may form, forexample, a layer from the emulsion of the polyurethane resin mixed with otherauxiliary agents. The auxiliary agents may be, for example, functional auxiliaryagents such as a lubricant, a bactericide, a thickener, a wetting agent, an antifoamingagent, water, and the like, but not limited thereto. The polyurethane resin may be anysuitable kind of aliphatic polyurethane or aromatic polyurethane, and may bepreferably, for example, an anionic, cationic, nonionic, amphoteric, solvent-based orsolvent-free polyurethane. The raw materials and preparation process for thepolyurethane may be adjusted to prepare a desired polyurethane. Furthermore, fromthe viewpoint of obtaining excellent film-forming and demolding properties, thepolyurethane resin may be selected from, for example, a polyurethane resinsynthesized from polyether / polyester polyols, may have a 100% tensile modulus of3.5 N / mm2 or lower, and a tensile strength of 25 MPa or more, for example. Thepresent invention is certainly not limited thereto.As shown in Figs. 1 and 2, the present disclosure provides a specific embodiment ofthe polyurethane condom 100, which can have a multi-layer structure formed bymultiple dip moldings on the mold 200, such as three layers (for example the firstlayer 10, the second layer 20, and the third layer 30), four layers, five layers, sixlayers, etc., but not limited thereto, as adjustable according to practical needs. Here,according to the types of the mold 200, the polyurethane condom 100 may beconfigured as a male condom, and it should be understood that the polyurethanecondom 100 may also be configured as a female condom or other heterotypiccondoms according to the types of the mold 200. For example, the mold 200 may beprovided with floating points or screw threads, but not limited thereto.The mold 200 is composed of a thermoplastic polymer having a surface tension in arange of 10-35 mN / m, for example, 25-35 mN / m, such as 35 mN / m, 32 mN / m, 30mN / m, or 28 mN / m. When the surface tension of the thermoplastic polymer is lessthan 10 mN / m, it is difficult to spread the polyurethane emulsion uniformly on themold 200 composed of the thermoplastic polymer; and when the surface tension ofthe thermoplastic polymer is more than 35 mN / m, the adhesion between a dried filmformed from the polyurethane emulsion and the mold 200 composed of thethermoplastic polymer is too strong to allow smooth demolding. Within the aboverange, when the polyurethane emulsion is molded, for example, dip-molded, on themold 200, the polyurethane emulsion can uniformly form a film directly on thesurface of the mold, and a film formed after drying has low adhesion to allow uniformdemolding without the aid of a release agent, which ensures uniformity of thepolyurethane film and avoids introduction of other substances, thereby sufficientlyensuring the performance and biological safety of the polyurethane condom product.In some embodiments, the thermoplastic polymer material may be, for example,ethylene-based polymers, propylene-based polymers, diene-based polymers, aromaticpolymers, and polyurethanes, polycarbonates, polymethyl methacrylates, polyamides,thermoplastic polyesters, polyoxymethylenes, and halogenated thermoplasticpolymers, such as thermoplastic polyesters.In some embodiments, the ethylene-based polymer may specifically be polyethyleneand copolymers thereof, ethylene-butene copolymers, ethylene-hexene copolymers,ethylene-octene copolymers, ethylene-propylene-butene copolymers, ethylene-vinylacetate copolymers, ethylene-ethyl acrylate copolymers, ethylene-methylmethacrylate copolymers, chlorinated polyethylene, ethylene-vinyl alcoholcopolymers, or the like.The propylene-based polymer may be polypropylene, polyacrylonitrile,propylene-ethylene copolymers, propylene-butene copolymers, propylene-hexenecopolymers, propylene-octene copolymers, or the like.The diene-based polymer may be polybutadiene, polyisoprene, butadiene-styrenecopolymers, butadiene-acrylonitrile copolymers,ethylene-propylene-5-ethylene-2-norbornene copolymers,ethylene-propylene-dicyclopentadiene copolymers, orethylene-propylene-5-vinyl-2-norbornene copolymers.The aromatic polymers may be polystyrene, modified polyphenylene ether, orcopolymers thereof, such as styrene-acrylonitrile copolymers,styrene-acrylonitrile-butadiene copolymers, acrylic rubber-acrylonitrile-styrenecopolymers, or acrylonitrile-chlorinated polyethylene-styrene copolymers.The above mentioned materials may be further selected from, for example,waterborne polyurethane, polymethyl methacrylate, polystyrene, polyethylene,polyvinyl chloride, polypropylene, polystyrene, butadiene-styrene, polyamide (e.g.polyamide 6, polyamide 11, polyamide 12, polyamide 6.6, polyamide 4.6, polyamide6.10, and polyamide 6.12, etc.), polycarbonate, polyoxymethylene, modifiedpolyphenylene oxide, thermoplastic polyester, polyimide, polyphenylene sulfide,polysulfones, aromatic polyamides, polyarylate, polyphenyl ester, polyaryletherketone,a liquid crystal polymer, and fluororesin.In other embodiments, the thermoplastic polymer may also include materials obtainedby organic modification of the above polymers or obtained by inorganic modificationby filling the above polymers with an inorganic material. Furthermore, themodification may be chemical or physical modification, or in any other suitablemanner.The organic modification may be for example organosilicon modification,organofluorine modification, graphene modification, silane modification, acrylatecopolymerization modification, vinyl monomer modification, aromatic monomermodification and the like, but not limited thereto.The inorganic modification may be for example heavy calcium modification, talcmodification, graphene modification, water glass modification, attapulgitemodification, kaolin modification, light calcium modification, glass microbeadsmodification and the like.As shown in Fig. 2, the mold 200 comprises a head portion 210 and a tail portion 220.The front end of the head portion 210 comprises a semen pouch 211, which isoptional. The rear end of the head portion 210 comprises a transition section 212 forconnecting the tail portion 220. The head portion 210 has a length H1 of, for example,200-260 mm, such as 220 mm, 230 mm or 245 mm, from the view point of molding.The head portion 210 has a columnar shape with a gradually increasing diameter, andhas a slope greater than 0° and less than or equal to 5°, such as 2°, 3° or 4°. Inparticular, the section of the head portion 210 close to the front end may have adiameter of 30-45 mm, and the section of the head portion 210 close to the rear endmay have a diameter greater than that of the section close to the front end, forexample, 32-50 mm, so that a desired slope is formed by the diameter differencebetween the two ends. When the mold 200 has a slope within the above range, themold 200 can be smoothly pulled out of the injection molding machine as described indetail below, so as to further reduce the demolding resistance. The tail portion 220 isconnected to the head portion 210 via the transition section 212 to form a smoothsurface. The tail portion 220 has a length H2 of, for example, 10-150 mm, such as 25mm, 30 mm, 35 mm, 40 mm, or 55 mm. The tail portion 220 has a columnar shapewith a constant diameter which is consistent with the diameter of the end section ofthe head portion 210. Certainly, the tail portion may also have a columnar shape witha gradually increasing diameter, and for example has a slope greater than 0° and lessthan or equal to 3°, for example 1°, 2°, or 3°. The mold 200, when placed vertically,forms an angle less than 5° with respect to the vertical line, thereby sufficientlyensuring that the mold 200 in use, for example when used vertically, has excellentstability and the polyurethane film is not easily damaged because of the rolling anddemolding processes.As shown in Fig. 2, the mold 200 composed of the thermoplastic polymer has athickness of, for example, 2-25 mm or is a solid mold, and preferably has a thicknessof 2-8 mm, for example, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, etc. The mold 200 mayhave a reliable strength by having the thickness in the above range.As shown in Fig. 2, the mold 200 has a surface roughness (Ra) of 0.2 or less, such as0.09, 0.09, 0.05 or 0.01. When the surface roughness (Ra) of the mold 200 is 0.2 orless, the polyurethane film is easy to handle during demolding without an additionalrelease agent for demolding, and damage to the polyurethane film due to externalforce is avoided.As shown in Fig. 3, the present disclosure also provides a method for manufacturingthe mold 200, comprising:-Step S1, providing a thermoplastic polymer;-Step S2, injection molding the thermoplastic polymer to produce the mold 200.The mold 200 may be obtained, for example, by using an injection molding machine.A multi-shot feed, such as a three-shot feed, may be employed to ensure uniformfeeding of the thermoplastic polymer in the injection molding machine. Furthermore,the mold 200 may be obtained by two-stage molding, in which the head portion 210and the tail portion 220 are separately formed and then assembled to form the mold200, but not limited thereto. The head portion 210 and the tail portion 220 may also beintegrally molded.When the mold 200 is used to mold a polyurethane condom, the mold 200 is hungvertically, dipped in an emulsion of waterborne polyurethane, and then taken out toallow the polyurethane to form a film on its surface, followed by demolding. Thepolyurethane film can be demolded smoothly without a release agent, and does notadhere to the mold 200.In a particular embodiment of the present disclosure, the mold 200 can bemanufactured by a method comprising three-shot feeding through the open end of thetail portion 210 and two-stage injection molding, wherein polyethylene (EnableTMperformance polyethylene from ExxonMobil Chemical) is formed into a cylindricaltubular body for the mold by injection molding. The head portion 210 has a length H1of 220 mm, and a slope of 0.2° from the front end to the rear end, such that thediameter of the front end of the head portion 210 is smaller than the diameter of therear end thereof and of the tail portion. The tail portion 220 has a length H2 which isnot limited. The mold 200 has a wall thickness of 2 mm, a surface roughness (Ra) of0.2 or less, and a verticality, the angle between the vertically placed mold and thevertical line, less than 5°.In another particular embodiment of the present disclosure, the mold 200 can bemanufactured by a method comprising three-shot feeding through the open end of thetail portion 210 and two-stage injection molding, wherein polypropylene (TB54I fromHanwha-Total) is formed into a cylindrical tubular body for the mold by injectionmolding. The head portion 210 has a length H1 of 230 mm, and a slope of 3° from thefront end to the rear end, such that the diameter of the front end of the head portion210 is smaller than the diameter of the rear end thereof and of the tail portion. The tailportion 220 has a length H2 which is not limited. The mold 200 has a wall thickness of5 mm, a surface roughness (Ra) of 0.2 or less, and a verticality, the angle between thevertically placed mold 200 and the vertical line, less than 5°.In another particular embodiment of the present disclosure, the mold 200 can bemanufactured by a method comprising three-shot feeding through the open end of thetail portion 210 and two-stage injection molding, wherein polycarbonate (Bayer 2407)is formed into a cylindrical tubular body for the mold by injection molding. The headportion 210 has a length H1 of 240 mm, and a slope of 5° from the front end to therear end, such that the diameter of the front end of the head portion 210 is smallerthan the diameter of the rear end thereof and of the tail portion. The tail portion 220has a length H2 which is not limited. The mold 200 has a wall thickness of 10 mm, asurface roughness (Ra) of 0.2 or less, and a verticality, the angle between thevertically placed mold 200 and the vertical line, less than 5°.The above description is merely preferred embodiments of the present disclosure, andis not intended to limit the present disclosure. For a person skilled in the art, thefeatures in the above-described embodiments can be combined with each other aslong as there is no conflict, and the present disclosure can also have variousmodifications and changes. Any modifications, equivalents, improvements, etc. thatfall within the spirit and principles of the present disclosure are intended to beincluded within the scope of the present disclosure. Furthermore, the examples are tobe construed as illustrative and not restrictive, while the scope of the presentdisclosure is defined by the appended claims rather than by the foregoing description.All changes which come within the meaning and range of equivalency of the claimsare therefore intended to be included herein. Any reference number used in a claimshould not be construed as limiting the claim.

Claims

1. A mold for molding a polyurethane condom, which has a surface roughness of 0.2 or less, and is composed of a thermoplastic polymer having a surface tension of 10-35 mN / m.

2. The mold for molding a polyurethane condom according to claim 1, wherein the thermoplastic polymer is any one selected from polyurethane, polymethyl methacrylate, polystyrene, polyethylene, polyvinyl chloride, polypropylene, polystyrene, acrylonitrile-butadiene-styrene, polyamide, polycarbonate, polyoxymethylene, modified polyphenylene oxide, thermoplastic polyesters, polyimides, polyphenylene sulfide, polysulfones, aromatic polyamides, polyarylates, polyphenyl esters, polyaryletherketones, liquid crystalline polymers, fluororesins, and materials obtained by organic modification of the above polymers or by inorganic modification by filling the above polymers with an inorganic material, or any combination thereof.

3. The mold for molding a polyurethane condom according to claim 2, wherein the organic modification is any one selected from organosilicon modification, organofluorine modification, silane modification, acrylate copolymerization modification, vinyl monomer modification, and aromatic monomer modification, or any combination thereof.

4. The mold for molding a polyurethane condom according to claim 2, wherein the inorganic modification is any one selected from heavy calcium modification, talc modification, graphene modification, water glass modification, attapulgite modification, kaolin modification, light calcium modification, and glass microbeads modification, and any combination thereof.

5. The mold for molding a polyurethane condom according to claim 1, wherein the polyurethane condom is a male condom, and the mold comprises: a head portion; and a tail portion connected to the head portion; wherein the head portion has a columnar shape with a gradually increasing diameter, and has a slope greater than 0° and less than or equal to 5°.

6. The mold for molding a polyurethane condom according to claim 5, wherein the head portion has a front end provided with a semen pouch.

7. The mold for molding a polyurethane condom according to claim 5, wherein the head portion has a length of 200-260 mm.

8. The mold for molding a polyurethane condom according to claim 5, wherein the head portion is connected to the tail portion via a transition section.

9. The mold for molding a polyurethane condom according to claim 5, wherein the tail portion has a columnar shape of a constant diameter.

10. The mold for molding a polyurethane condom according to claim 5, wherein the tail portion has a columnar shape with a gradually increasing diameter, and has a slope greater than 0° and less than or equal to 3°.

11. The mold for molding a polyurethane condom according to claim 1, wherein the polyurethane condom is a female condom.

12. The mold for molding a polyurethane condom according to claim 1, wherein the polyurethane condom is a heterotypic condom, and the mold has a surface provided with floating points or screw threads.

13. The mold for molding a polyurethane condom according to claim 1, wherein the mold has a thickness of 2-25 mm, or is a solid mold.

14. The mold for molding a polyurethane condom according to claim 1, wherein the mold, when placed vertically, has an angle less than 5° with respect to the vertical line.

15. A method for manufacturing a mold for molding a polyurethane condom, comprising the steps of: - providing a thermoplastic polymer having a surface tension of 10-35 mN / m; - injection molding the thermoplastic polymer to produce a mold for molding a polyurethane condom; wherein the mold has a surface roughness of 0.2 or less.

16. The method for manufacturing a mold for molding a polyurethane condom according to claim 15, wherein the injection molding is carried out by three-shot feed and two-stage injection molding.

17. A method for using a mold for molding a polyurethane condom, comprising the steps of: - providing a mold; - providing an emulsion comprising a polyurethane resin; - hanging the mold vertically and dipping it in the emulsion containing the polyurethane resin to obtain a dipped mold; - removing the dipped mold and drying it to form a polyurethane film on the surface of the mold; and - demolding; wherein the mold has a surface roughness of 0.2 or less, and is composed of a thermoplastic polymer having a surface tension of 10-35 mN / m.

18. The method for using a mold for molding a polyurethane condom according to claim 17, wherein the polyurethane condom has a 100% tensile modulus of 3.5 N / mm2 or lower.

19. The method for using a mold for molding a polyurethane condom according to claim 17, wherein the polyurethane condom has a burst pressure of 1 kPa or more, a burst volume of 5 L or more, and a 100% modulus of 3.5 N / mm2 or lower.