阅读说明：本技术 一种带黏合层的纯聚氨酯安全套及其制备方法 (Pure polyurethane condom with adhesive layer and preparation method thereof ) 是由 戴家兵 李维虎 冯林林 陈亮 于 2020-05-20 设计创作，主要内容包括：本发明提供了一种带黏合层的纯聚氨酯安全套及其制备方法。所述带黏合层的纯聚氨酯安全套,至少包括,第一聚氨酯膜层；聚氨酯黏合层,位于所述第一聚氨酯膜层上；第二聚氨酯膜层,位于所述聚氨酯黏合层上；所述聚氨酯黏合层100％拉伸模量小于等于2.5N/mm<Sup>2</Sup>；所述第一聚氨酯膜层和所述第二聚氨酯膜层的结构不相同于所述聚氨酯黏合层。根据本发明提供的纯聚氨酯安全套的柔软、强度等性能可以达到最佳的性能,满足产品市场需求。(The invention provides a pure polyurethane condom with an adhesive layer and a preparation method thereof. The pure polyurethane condom with the bonding layer at least comprises a first polyurethane film layer; a polyurethane adhesive layer on the first polyurethane film layer; a second polyurethane film layer on the polyurethane adhesive layer; the 100% tensile modulus of the polyurethane bonding layer is less than or equal to 2.5N/mm 2 (ii) a The first polyurethane film layer and the second polyurethane film layer are different in structure from the polyurethane adhesive layer. The pure polyurethane condom provided by the invention has the advantages that the performances such as softness, strength and the like can reach the optimal performances, and the market demand of products is met.)

1. A pure polyurethane condom with an adhesive layer is characterized by at least comprising,

a first polyurethane film layer;

a polyurethane adhesive layer on the first polyurethane film layer;

a second polyurethane film layer on the polyurethane adhesive layer;

the 100% tensile modulus of the polyurethane bonding layer is less than or equal to 2.5N/mm²；

The first polyurethane film layer and the second polyurethane film layer are different in structure from the polyurethane adhesive layer.

2. The pure polyurethane condom with adhesive layer according to claim 1, wherein the first polyurethane film layer is selected from at least one of the following:

tensile strength is more than or equal to 25 MPa;

100% tensile modulus of 3.5N/mm or less²；

The elongation at break is more than or equal to 500 percent;

after the polyurethane film layer is soaked in water at the temperature of 30-60 ℃ for 0.1-1h, the retention rate of the tensile strength is more than or equal to 60%;

under the condition that a condom with 10-25um is independently formed by the first polyurethane film layer, the bursting pressure is more than or equal to 2.0 KPa;

under the condition that the condom with 10-25um is formed by the first polyurethane film layer independently, the explosion volume is more than or equal to 5L.

3. The pure polyurethane condom with adhesive layer according to claim 1 or 2, wherein the first polyurethane film layer has the same structure as the second polyurethane film layer.

4. The pure polyurethane condom with adhesive layer according to claim 1 or 2, wherein the first polyurethane film layer has a different structure from the second polyurethane film layer.

5. The pure polyurethane condom with adhesive layer according to claim 1 or 2, characterized in that the polyurethane condom further comprises:

and the third polyurethane film layer is positioned on the second polyurethane film layer, and the structure of the third polyurethane film layer is different from that of the second polyurethane film layer.

6. The pure polyurethane condom with adhesive layer according to claim 1, wherein the polyurethane adhesive layer comprises at least one layer, and the thickness of the polyurethane adhesive layer of each layer is 0.1-20 μm.

7. The pure polyurethane condom with adhesive layer according to claim 1, wherein the polyurethane adhesive layer is selected from any one or combination of anionic, cationic, nonionic, amphoteric, solvent-based, solvent-free polyurethane.

8. The pure polyurethane condom with adhesive layer according to claim 7, wherein the polyurethane is any one or combination of polyether type, polyester type and polyether-polyester mixed polyurethane resin.

9. The pure polyurethane condom with binding layer according to claim 7, wherein the anionic type is carboxylic acid type, sulfonic acid type or a mixture of both.

10. A pure polyurethane condom with an adhesive layer, the condom comprising at least:

a first polyurethane film layer;

a first polyurethane adhesive layer on the first polyurethane film layer;

a second polyurethane film layer on the first polyurethane adhesive layer;

a second polyurethane adhesive layer on the second polyurethane film layer;

a third polyurethane film layer on the second polyurethane adhesive layer;

a fourth polyurethane film layer on the third polyurethane film layer;

the first polyurethane film layer, the second polyurethane film layer and the fourth polyurethane film layer are different from the first polyurethane adhesive layer in structure;

the structure of the first polyurethane bonding layer is the same as that of the second polyurethane bonding layer, and the 100% tensile modulus is less than or equal to 2.5N/mm²；

The structure of the first polyurethane film layer is the same as that of the third polyurethane film layer, and the elongation at break is more than or equal to 500%;

the 100% tensile modulus of the second polyurethane film layer is less than or equal to 3.5N/mm²；

And the fourth polyurethane film layer has a bursting volume of more than or equal to 5L under the condition of forming a condom with 10-25 um.

11. The preparation method of the pure polyurethane condom with the bonding layer is characterized by at least comprising the following steps:

impregnating a first polyurethane resin and drying to form a first polyurethane film layer;

dipping polyurethane bonding layer resin on the first polyurethane film layer, and drying to form a polyurethane bonding layer;

dipping second polyurethane resin on the polyurethane bonding layer, and drying to form a second polyurethane film layer;

dipping a release agent on the second polyurethane film layer, and drying, demolding and electrically detecting to obtain the polyurethane condom;

100 percent of the polyurethane bonding layer and the tensile modulus of less than or equal to 2.5N/mm²；

The first polyurethane film layer and the second polyurethane film layer are different in structure from the polyurethane adhesive layer.

Technical Field

The invention belongs to the field of condom materials, and particularly relates to a pure polyurethane condom with an adhesive layer and a preparation method thereof.

Background

Condoms are the most widely and simply used devices for contraception and prevention of venereal disease transmission in the world at present, and the existing products mainly comprise natural latex rubber condoms and waterborne polyurethane condoms.

At present, the thickness of the natural latex rubber condom is difficult to be less than 0.04mm due to the material characteristics of natural latex, and meanwhile, the natural latex contains a plurality of proteins, so that certain safety risks exist in the use of protein allergy people. With the improvement of living standard of people, the demand of consumers on condoms not only stays on the basic function of contraception, but also more uses and experiences of condoms are required. The polyurethane condom is a novel product on the market in recent years, and through the reform of materials, the thickness of the polyurethane condom is thin, so that consumers have real and pleasant experience when using the condom, but the flexibility of the polyurethane material has a certain difference relative to natural rubber.

However, the single polyurethane resin is difficult to achieve the ideal in softness, bursting property, water resistance and strength, so that the condom can achieve the optimal performance by providing a new condom, meets the market demand of products and has very important significance.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a pure polyurethane condom with adhesive layer, which avoids the use of different resins, and is compounded with adhesive layer, so that the properties of softness, strength, etc. can reach the best, and meet the market demand of the product.

It is another object of the present invention to provide a method for preparing a pure polyurethane condom with an adhesive layer as described above and in detail below.

In order to achieve the above objects and other related objects, the present invention comprises the following technical solutions:

a pure polyurethane condom with an adhesive layer at least comprises a first polyurethane film layer; a polyurethane adhesive layer on the first polyurethane film layer; a second polyurethane film layer on the polyurethane adhesive layer; the 100% tensile modulus of the polyurethane bonding layer is less than or equal to 2.5N/mm 2; the first polyurethane film layer and the second polyurethane film layer are different in structure from the polyurethane adhesive layer.

In one embodiment of the present invention, the first polyurethane film layer is selected from at least one of: tensile strength is more than or equal to 25 MPa; 100% tensile modulus of 3.5N/mm2 or less; the elongation at break is more than or equal to 500 percent; after the polyurethane film layer is soaked in water at the temperature of 30-60 ℃ for 0.1-1h, the retention rate of the tensile strength is more than or equal to 60%; under the condition of the condom which is independent of 10-25um by the first polyurethane film layer, the bursting pressure is more than or equal to 2.0 KPa; under the condition of the condom which is independent of 10-25um by the first polyurethane film layer, the bursting volume is more than or equal to 5L.

In an embodiment of the present invention, the first polyurethane film layer has the same structure as the second polyurethane film layer.

In an embodiment of the present invention, the first polyurethane film layer has a different structure from the second polyurethane film layer.

In one embodiment of the present invention, the polyurethane condom further comprises: and the third polyurethane film layer is positioned on the second polyurethane film layer, and the structure of the third polyurethane film layer is different from that of the second polyurethane film layer.

In one embodiment of the present invention, the polyurethane adhesive layer includes at least one layer, and the thickness of the polyurethane adhesive layer of each layer is 0.1 to 20 μm.

In one embodiment of the present invention, the polyurethane adhesive layer is selected from any one of anionic, cationic, nonionic, amphoteric, solvent-based, and solvent-free polyurethanes, or any combination thereof.

In an embodiment of the present invention, the polyurethane is any one of polyether type, polyester type, and polyether-polyester mixed polyurethane resin or any combination thereof.

In one embodiment of the present invention, the anion is a carboxylic acid type, a sulfonic acid type, or a mixture of both. .

The invention also discloses a pure polyurethane condom with an adhesive layer, which at least comprises: a first polyurethane film layer;a first polyurethane adhesive layer on the first polyurethane film layer; a second polyurethane film layer on the first polyurethane adhesive layer; a second polyurethane adhesive layer on the second polyurethane film layer; a third polyurethane film layer on the second polyurethane adhesive layer; a fourth polyurethane film layer on the third polyurethane film layer; the first polyurethane film layer, the second polyurethane film layer and the fourth polyurethane film layer are different from the first polyurethane adhesive layer in structure; the structure of the first polyurethane adhesive layer is the same as the structure of the second polyurethane adhesive layer, and the 100% tensile modulus is less than or equal to 2.5N/mm 2; the structure of the first polyurethane film layer is the same as that of the third polyurethane film layer, and the elongation at break is more than or equal to 500%; the 100% tensile modulus of the second polyurethane film layer is less than or equal to 2.5N/mm²(ii) a And the fourth polyurethane film layer has a bursting volume of more than or equal to 5L under the condition of forming a condom with 10-25 um.

The invention also discloses a preparation method of the pure polyurethane condom with the adhesive layer, which comprises the following steps: impregnating a first polyurethane resin and drying to form a first polyurethane film layer; dipping polyurethane bonding layer resin on the first polyurethane film layer, and drying to form a polyurethane bonding layer; dipping second polyurethane resin on the polyurethane bonding layer, and drying to form a second polyurethane film layer; dipping a release agent on the second polyurethane film layer, and drying, demolding and electrically detecting to obtain the polyurethane condom; the 100% tensile modulus of the polyurethane bonding layer is less than or equal to 2.5N/mm 2; the first polyurethane film layer and the second polyurethane film layer are different in structure from the polyurethane adhesive layer.

According to the pure polyurethane condom with the bonding layer, the waterborne polyurethane with low modulus and high bonding property is used as the bonding layer, and the polyurethane film layers with the same or different properties are bonded together through the bonding layer for composite forming, so that the condom consisting of the pure polyurethane is prepared. In addition, the formula of the invention has low cost, adopts impregnation molding, and has simple molding process, safety and environmental protection. Other features, benefits and advantages will be apparent from the disclosure including the description and claims detailed herein.

Drawings

FIG. 1 shows a schematic structural view of one embodiment of the polyurethane condom with adhesive layer according to the invention.

Fig. 2 shows a schematic structural view of the structural layers of the polyurethane condom of fig. 1.

Fig. 3 shows a schematic structural view of another embodiment of the structural layer of the polyurethane condom: it comprises 4 layers.

Fig. 4 shows a schematic structural view of another embodiment of the structural layer of the polyurethane condom: it comprises 6 layers.

FIG. 5 is a flow chart showing a method for preparing the polyurethane condom with adhesive layer according to the invention.

Detailed Description

The present invention is further illustrated below with reference to specific examples, which are intended to be illustrative only and not to limit the scope of the invention.

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

As shown in fig. 1 to 5, the present application provides a polyurethane condom 100, the polyurethane condom 100 is a condom made of polyurethane material, and has high strength, compactness and biocompatibility, and the thickness of the polyurethane condom 100 can be, for example, 0.001mm-0.04mm, such as 0.01mm, 0.015mm, 0.019mm, 0.028mm and 0.035mm, which can provide more comfortable experience for users and softer and more delicate skin-friendly touch feeling, and the strength, such as tensile strength, can be, for example, greater than or equal to 30MPa, further, greater than or equal to 40MPa, and the problem of allergy caused by natural latex condoms can not occur.

As shown in fig. 1, the present invention provides a specific embodiment of a polyurethane condom 100, which may be composed of a multi-layer structure, such as 3 layers, 4 layers, 5 layers, 6 layers, etc., but is not limited thereto, and may be adjusted according to actual needs. Here, the polyurethane condom 100 is configured as a male condom, it being understood that it may also be configured as a female condom, as well as other shaped condoms and the like, and any product comprising the polyurethane condom 100 in the layer configuration of the present invention is intended to be within the scope of the present invention.

The polyurethane condom 100 provided by the invention is made of pure polyurethane materials, and the waterborne polyurethane with low modulus and high adhesiveness is used as the adhesive layer, and polyurethane film layers with the same performance or different performances on two sides of the adhesive layer are adhered together for composite forming, so that the respective performance advantages of the polyurethane materials of each layer are fully exerted, the performances such as softness, strength and the like of a condom product are effectively adjusted, the optimization of the performance is achieved, and the market demand of the product is met.

As shown in fig. 1 and 2, the polyurethane condom 100 comprises a first polyurethane film layer 10, a polyurethane adhesive layer 20 and a second polyurethane film layer 30. The first polyurethane film layer 10 may be an innermost layer of the polyurethane condom 100 and may be in contact with the skin during use, but may be an outermost layer thereof and may be adjusted as needed.

As shown in fig. 2, the first polyurethane film layer 10 may be a layer made of a polyurethane resin, or may be a layer made of an emulsion of the polyurethane resin and other additives. The auxiliary agent may be, for example, functional auxiliary agents such as lubricants, bactericides, thickeners, wetting agents, antifoaming agents, water, and the like, but is not limited thereto. The polyurethane resin may be any suitable type of aliphatic polyurethane or aromatic polyurethane, further, for example, anionic, cationic, nonionic, amphoteric, solvent-based, solvent-free polyurethane, and the raw materials and preparation processes of the polyurethane may be adjusted to produce a desired polyurethane.

In some embodiments, the tensile strength of the polyurethane resin may be, for example, 25MPa or more, further 30MPa or more, for example, 35MPa, 38MPa, 40MPa, 60MPa, to constitute the high-strength polyurethane resin a, and the first polyurethane film layer 10 thus formed has a high tensile strength without being easily broken.

In some embodiments, the 100% tensile modulus of the polyurethane resin, for example, can be less than or equal to 3.5N/mm²E.g. 2.5N/mm²、2N/mm²、1.8N/mm²、1.5N/mm²、0.6N/mm²Thus, the low-modulus polyurethane resin B is formed, and the first polyurethane film layer 10 formed therefrom has good flexibility.

In some embodiments, the elongation at break of the polyurethane resin may be, for example, 500% or more, for example 600%, and further 700% or more, for example 700%, 800%, 830%, 900%, 1000%, to constitute the highly extensible polyurethane resin C, thereby forming the first polyurethane film layer 10 having high extensibility and tensile property.

In some embodiments, after the dry film of the polyurethane resin is soaked in water at 30-60 ℃ for 0.1-1h, for example, soaked in water at 40 ℃ for 0.5h, soaked in water at 50 ℃ for 0.5h, and soaked in water at 50 ℃ for 0.6h, the retention rate of the wet film tensile strength is greater than or equal to 60%, for example, maintained at 65% and 75%, so as to form the water-resistant polyurethane resin D, and the first polyurethane film layer 10 formed thereby has good water resistance.

In some embodiments, the polyurethane resin can be separately made into condoms, and when a 10-25um condom is formed by the polyurethane resin, such as 20um and 22um condoms, the bursting pressure of the condom is greater than or equal to 2.0KPa, such as 3.0KPa, 4.0KPa and 5.0KPa, so that the high bursting pressure polyurethane resin E is formed.

In some embodiments, the polyurethane resin can be made into condoms alone, and when a condom of 10-25um, such as 20um, 22um, is formed, the bursting volume of the condom is greater than or equal to 5L, such as 8L, 10L, 12L, 15L, so that the high bursting volume polyurethane resin F is formed.

It should be understood that the properties of the polyurethane resin of the first polyurethane film layer 10 are only exemplified, but the invention is not limited thereto, and more properties of the polyurethane resin, such as tear resistance, oil resistance, adhesion resistance, electrical breakdown resistance, etc., may be formed according to actual needs.

As shown in FIG. 2, the first polyurethane film layer may have a thickness of, for example, 0.1-20 μm, such as 0.3 μm, 1 μm, 3 μm, 5 μm, 10 μm.

As shown in fig. 2, the urethane adhesive layer 20 is located on the first urethane film layer 10, and may be a layer made of a urethane resin or an emulsion prepared by compounding the urethane resin with other additives. The auxiliary agent may be, for example, functional auxiliary agents such as lubricants, bactericides, thickeners, wetting agents, antifoaming agents, water, and the like, but is not limited thereto. The polyurethane resin may be any suitable type of aliphatic polyurethane or aromatic polyurethane, further, for example, anionic, cationic, nonionic, amphoteric, solvent-based, solvent-free polyurethane, and the raw materials and preparation processes of the polyurethane may be adjusted to prepare a desired polyurethane, further, specific examples of the polyurethane may include polyether, polyester, and polyether polyester hybrid polyurethane resins, and further, anionic polyurethane, for example, carboxylic acid type, sulfonic acid type, or anionic polyurethane in which both are mixed, may be selected. The polyurethane resin of the polyurethane adhesive layer 20 is different from the polyurethane resin of the other film layers from the viewpoint of obtaining the adhesiveness of the adhesive layer and balancing the properties between the first polyurethane film layer and the second polyurethane film layer, the polyurethane resin is a low-modulus polyurethane material, is synthesized using polyether/polyester polyol, has good adhesion to the other polyurethane materials, and has the feature of flexibility, 100% tensile modulus of 3.5N/mm or less²E.g. 2N/mm²、1.8N/mm²、1.5N/mm²、1.2N/mm²、1N/mm²。

In some embodiments, the polyurethane material of the polyurethane adhesive layer 20 has a glass transition temperature of, for example, 0 ℃ or lower, further-10 ℃ or lower, and in other embodiments, a number average molecular weight of, for example, 200000g/mol or lower, for example 150000g/mol, 100000g/mol, 80000g/mol, 50000g/mol, 40000g/mol, 20000g/mol or lower. Further, the polyurethane material of the polyurethane adhesive layer 20 may be a polyurethane material obtained by blending the polyurethane resin with other materials (e.g., natural rubber), and in this case, the proportion of the number average molecular weight of the polyurethane resin component is, for example, 50000 or less should be in the range of 10 to 100%, for example, 40%, 60%. The adhesive layer within the above range has low modulus and soft characteristics and has desired adhesiveness, so that when it is used as a middle layer of a polyurethane condom, film layers on both sides can be closely adhered without delamination, and respective properties of the film layers on both sides can be sufficiently exhibited.

As shown in fig. 2, the polyurethane adhesive layer 20 is used as a middle layer, and tightly adheres the film layers on both sides thereof, and includes at least one layer, such as one layer, two layers, three layers, etc., each layer having a film layer of another material laminated on both sides thereof. The polyurethane adhesive layer 20 may, for example, have a thickness of 0.1-20 μm, further 0.1-10 μm, such as 1 μm, 2 μm, 3 μm, 5 μm, based on obtaining a low modulus, high adhesion polyurethane adhesive layer 20 and a desired thickness of the polyurethane condom 100.

As shown in fig. 2, the second polyurethane film layer 30 is located on the polyurethane adhesive layer 20, and the second polyurethane film layer 30 may be a layer made of a polyurethane resin, or a layer made of an emulsion of the polyurethane resin and other additives. The auxiliary agent may be, for example, functional auxiliary agents such as lubricants, bactericides, thickeners, wetting agents, antifoaming agents, water, and the like, but is not limited thereto.

As shown in fig. 2, the second film layer 30 may have a thickness of, for example, 0.1 to 30 μm, such as 1 μm, 2 μm, 3 μm, 5 μm, 10 μm, 15 μm, 20 μm, based on the polyurethane condom 100 to obtain a desired thickness and a desired interlayer adhesion.

In some embodiments, the second polyurethane film 30 has the same structure as the first polyurethane film 10, for example, the polyurethane resin of the second polyurethane film 30 has the same performance as the first polyurethane film 10, specifically, for example, the polyurethane resin of the first polyurethane film 10 and the polyurethane resin of the second polyurethane film 30 are the same resin, both are high-strength polyurethane resin a, or both are low-modulus polyurethane resin B, or both are high-elongation polyurethane resin C, and are bonded by the bonding layer 20 (for example, when the bonding layer resin is denoted by N), so as to obtain the polyurethane condom 100 of the high-strength ANA structure layer, the polyurethane condom 100 of the soft B structure layer, and the polyurethane condom 100 of the high-elongation CNC structure layer, respectively. In addition, for example, the thickness of the second polyurethane film layer 30 may be the same as the thickness of the first polyurethane film layer 10, such as 10um, 15um, and 20 um. Of course, the present invention is not limited thereto.

In other embodiments, the structure of the second polyurethane film 30 is different from that of the first polyurethane film 10, for example, the performance of the polyurethane resin of the second polyurethane film 30 is different from that of the first polyurethane film 10, specifically, for example, the polyurethane resin of the first polyurethane film 10 is high-strength polyurethane resin a, the polyurethane resin of the second polyurethane film 30 is low-modulus polyurethane resin B, and the polyurethane condom 100 having a high-strength and soft ANB structure layer is obtained through the adhesion of the adhesive layer 20; the polyurethane resin of the first polyurethane film layer 10 is high-strength polyurethane resin a, the polyurethane resin of the second polyurethane film layer 30 is high-elongation polyurethane resin C, and the polyurethane condom 100 with the high-strength and high-tensile ANC structural layer is obtained by bonding the bonding layer 20; the polyurethane resin of the first polyurethane film layer 10 is low modulus polyurethane resin B, the polyurethane resin of the second polyurethane film layer 30 is high burst pressure polyurethane resin E, and the polyurethane condom 100 having a BNE structure layer with high strength and high burst pressure is obtained by bonding the bonding layer 20. According to the invention, the bonding of the bonding layer 20 is utilized to exert the performance advantages of the first polyurethane film layer 10 and the second polyurethane film layer 30, so that the polyurethane condom with optimal performance is obtained. In addition, for example, the thickness of the second polyurethane film layer 30 is different from the thickness of the first polyurethane film layer 10, for example, the first polyurethane film layer 10 is 10um, and the second polyurethane film layer 30 is 15 um; the first polyurethane film layer 10 is 15um, and the second polyurethane film layer 30 is 10 um. Of course, the present invention is not limited thereto.

Referring to fig. 3, in another embodiment of the polyurethane condom 100 disclosed in the present invention, the polyurethane condom 100 comprises a first polyurethane film 10, a polyurethane adhesive layer 20, a second polyurethane film 30 and a third polyurethane film 40.

As shown in fig. 3, the first polyurethane film layer 10, the polyurethane adhesive layer 20, and the second polyurethane film layer 30 may be, for example, the same as those described above.

As shown in fig. 3, the third polyurethane film layer 40 is located on the second polyurethane film layer 30, and based on the polyurethane condom 100 obtaining the expected performance, the structure of the third polyurethane film layer 40 is different from that of the second polyurethane film layer 30, such as different performances, specifically, for example, the second polyurethane film layer 30 is a high-strength polyurethane resin a, and the third polyurethane film layer 40 is a low-modulus polyurethane resin B, and in a specific embodiment, for example, the polyurethane condom 100 can form an ANAB structural layer; the second polyurethane film layer 30 is a low modulus polyurethane resin B and the third polyurethane film layer 40 is a high elongation polyurethane resin C, and in a specific embodiment, for example, the polyurethane condom 100 with an ANBC structural layer can be formed. Of course, the present invention is not limited thereto.

As shown in fig. 4, the present invention also discloses another embodiment of the polyurethane condom 100, and the polyurethane condom 100 comprises a first polyurethane film 10, a first polyurethane adhesive layer 21, a second polyurethane film 30, a second polyurethane adhesive layer 22, a third polyurethane film 40, and a fourth polyurethane film 50.

As shown in fig. 4, the polyurethane adhesive layer includes a first polyurethane adhesive layer 21 and a second polyurethane adhesive layer 22, which are, for example, layers composed of the same resin, the first polyurethane adhesive layer 21 is respectively compounded with a first polyurethane film layer 10 and a second polyurethane film layer 30 on both sides thereof, and the second polyurethane adhesive layer 22 is respectively compounded with a second polyurethane film layer 30 and a third polyurethane film layer 40 on both sides thereof.

As shown in fig. 4, the first urethane film layer 10, the first urethane adhesive layer 21, the second urethane film layer 30, the second urethane adhesive layer 22, and the third urethane film layer 40 may be, for example, the same as those described above. The fourth polyurethane film layer 50 is located on the third polyurethane film layer 40, and their structures are different, such as different properties. In a specific embodiment, for example, a polyurethane condom 100 that may form a CNBNCF structural layer: the polyurethane adhesive layers 21 and 22 have 100% tensile modulus of 2.5N/mm or less²E.g. 1.8N/mm²The polyurethane of (a); the first polyurethane film layer 10 and the third polyurethane film layer 40 have the same structure, and the elongation at break is greater than or equal to 500%, for example, 800%; the 100% tensile modulus of the second polyurethane film layer 30 is 3.5N/mm or less²E.g. 3.2N/mm²(ii) a The fourth polyurethane film 50 has a burst volume of 5L or more, for example, 7L, under the condition of forming a condom of, for example, 20 um.

In another specific embodiment, for example, an ANBNCD constituent layer may be formed: the polyurethane adhesive layers 21, 22 are, for example, of 100% tensile modulus 2N/mm²The polyurethane resin of (4); the first polyurethane film layer 10 and the third polyurethane film layer 40 are polyurethane resin with tensile strength of 35 Mpa; the second polyurethane film layer 30 has a 100% tensile modulus of 3.2N/mm²The polyurethane resin of (4); the fourth polyurethane film layer 50 is a polyurethane resin having a tensile strength retention rate of 65% after being soaked in water at 50 ℃ for 0.5 hour.

The polyurethane condom may be formed with more structural layers, such as ANBNC structural layer, BNANE structural layer, DNDNANF structural layer, etc., but not limited thereto, and it should be understood that any structure in which the polyurethane adhesive layer 20 is used as the middle layer of the polyurethane condom 100 and the polyurethane film layers on both sides thereof are combined is within the scope of the claimed invention.

The invention also provides a preparation process of the pure polyurethane condom with the bonding layer, and the preparation method of the pure polyurethane condom comprises but is not limited to the following steps S1-S4.

S1, impregnating the first polyurethane resin and drying to form a first polyurethane film layer;

s2, impregnating polyurethane adhesive layer resin on the first polyurethane film layer and drying to form a polyurethane adhesive layer;

s3, dipping a second polyurethane resin on the polyurethane adhesive layer and drying to form a second polyurethane film layer;

and S4, dipping a release agent on the second polyurethane film layer, and drying, demolding and electrically detecting to obtain the polyurethane condom.

During the steps S1-S4 as described above, for example, a glass mold may be employed, and the surface of the glass mold is heated to 20-50 deg.C, e.g., 35 deg.C, 40 deg.C, impregnated with a first polyurethane resin, and dried, e.g., at 80-120 deg.C, e.g., 90 deg.C, 100 deg.C, 110 deg.C; impregnating adhesive layer polyurethane resin, and drying at 70-110 deg.C, such as 80 deg.C, 90 deg.C, 100 deg.C; impregnating a second polyurethane resin, and drying at the temperature of 100-120 ℃, for example, 110 ℃; after crimping, the polyurethane condom is dried at the temperature of 100-.

The present invention will be described in more detail with reference to specific examples.

Examples of the invention