A double-layer affinity lubricating condom using a water-soluble lubricant and a preparation method thereof

Abstract

The present invention belongs to the technical field of condoms, and discloses a double-layer affinity lubricating condom using a water-soluble lubricant and a preparation method thereof. The present invention draws on the method of affinity coating, and two lubricants are coated on the film of the natural rubber latex condom body, and an aqueous lubricant (liquid affinity layer lubricant) with good compatibility with the natural rubber film of the condom body is used as the affinity layer. The water-soluble polymer used as the affinity layer has good compatibility and adhesion with the natural rubber film; an aqueous lubricant (liquid lubricating layer lubricant) with excellent lubricating properties is used as the lubricating layer, so that while solving the compatibility problem between the lubricant and the natural rubber film, the condom has excellent lubricating properties, prolongs the lubrication time, and improves the user's experience. At the same time, the condom can be mass-produced on existing equipment, and the use process is no different from that of ordinary condoms, and has high practical value.

Description

Technical Field

[0001] The invention belongs to the technical field of condoms, and in particular relates to a double-layer affinity lubricating condom using a water-soluble lubricant and a preparation method thereof. Background Art

[0002] Condoms are currently an important means for humans to prevent unwanted pregnancies during sexual intercourse. In the process of using condoms, in addition to the primary safety, the comfort and experience of use are also the focus of users, which is mainly reflected in the requirements for lubrication performance.

[0003] Traditional condoms use silicone oil as lubricant. Silicone oil has good lubrication properties, but its compatibility with human tissue is poor, it feels greasy when used, and it is not easy to clean after use, so it is gradually being eliminated by the market; on the contrary, water-soluble lubricants are becoming more and more popular among consumers due to their good compatibility with the human body, no strange feeling when used, and easy to clean.

[0004] However, there is a natural defect when using water-soluble lubricants on condoms: the compatibility with the material of condoms is very poor. Condoms are made of natural rubber, which is composed of natural 1,4-polyisoprene, which is highly hydrophobic. Therefore, water-soluble lubricants cannot adhere to the surface of condoms and are very easy to flow from the surface of condoms. This leads to the problem of reduced lubrication effect and shortened lubrication time when using water-soluble lubricants on condoms, which greatly affects the comfort and experience of use.

[0005] The interface compatibility problem is one of the common problems in the field of materials, and there is also a mature solution - affinity coating, that is, a layer of substance that has affinity for both substances on the original interface is attached to the substrate with poor compatibility. Through this layer of amphiphilic substance, the originally poorly compatible substances are grafted together.

[0006] In view of the compatibility problem between the condom and the water-soluble lubricant, the technicians in this field have proposed some solutions for the affinity coating method:

[0007] For example, in the international patent WO98 / 15301, the hydrating agent is introduced into the organic coating liquid in an ultra-fine and uniformly dispersed manner. When applied to the surface of the latex product, the coating liquid forms a uniform coating, which adheres to the substrate but does not adhere to the wetted tissue in contact with it. However, because the wall thickness of the condom product is very low (especially now showing a trend of becoming thinner and thinner), a small amount of organic solvent will cause irreversible reduction in the performance of the condom or even overall destruction, so this method is not suitable for condom products.

[0008] As in international patents WO2018 / 071131 and WO2021 / 130625, water-soluble polymers and aqueous latex are mixed together, coated on the surface of the elastomeric product and heated and cured to form an affinity coating, thereby reducing the contact angle of the elastomer surface and increasing the hydrophilicity of the elastomer surface. This solution not only has a complicated preparation process, but also has limited practical use value. First, adding water-soluble polymers to latex can easily lead to latex demulsification, and the entire system quickly collapses, resulting in stratification and sedimentation; secondly, even if the water-soluble polymer and the aqueous latex can be mixed together, during the heating and curing process, the surfactant on the surface of the latex quickly detaches, and the exposed hydrophobic polymer will also quickly separate from the water-soluble polymer, causing delamination problems.

[0009] In patent CN204600852U, a layer of solid film of high molecular weight polyvinyl pyrrolidone is directly formed on the surface of the condom, and then a common lubricant is dripped on it. This scheme draws on the lubrication scheme of preparing urinary catheters in the past, depositing a layer of polyvinyl pyrrolidone film on the tube wall, and then lubricating it. It should be said that this is an effective affinity lubrication scheme, but there are process problems on condoms. Because in the preparation process of condoms, there is a winding process, and the condoms must be rolled up for packaging. If there is a layer of polyvinyl pyrrolidone on the surface of the condom, it will absorb water very slowly after rolling it up, so that a high concentration of polyvinyl pyrrolidone solution (gel) will be locally formed in the curling gap of the condom, and the viscosity of the high concentration of polyvinyl pyrrolidone solution (gel) is very high, which will eventually cause the condoms to stick together and cannot be unfolded for use. Therefore, the actual use value of this scheme is also quite limited.

[0010] Based on this, it is necessary to provide a double-layer affinity lubricating condom using a water-soluble lubricant, which can solve the compatibility problem between the lubricant and the natural rubber film while making the condom have excellent lubricating properties. Summary of the invention

[0011] In order to overcome the deficiencies of the above-mentioned prior art, the present invention proposes a double-layer affinity lubricating condom using a water-soluble lubricant and a preparation method thereof. The condom draws on the solution of the affinity coating, and proposes a special formula and a method matching the actual production method of the condom according to the material and manufacturing process characteristics of the condom product, thereby solving the problem of reduced lubrication performance caused by poor compatibility between the condom and the water-soluble lubricant. At the same time, the condom can be mass-produced on existing equipment, and the use process is no different from that of ordinary condoms, and has high practical value.

[0012] To achieve the above-mentioned object, in a first aspect, the present invention provides a method for preparing a double-layer affinity lubricating condom using a water-soluble lubricant, wherein the condom comprises a condom body and a water-soluble lubricant; the water-soluble lubricant is a liquid affinity layer lubricant and a liquid lubricating layer lubricant;

[0013] The liquid affinity layer lubricant is an aqueous solution of a water-soluble polymer 1; the water-soluble polymer 1 includes at least one of polyvinyl alcohol (PVA), polyvinyl acetate (PVAc), and polyvinyl pyrrolidone (PVP);

[0014] The liquid lubricating layer lubricant is an aqueous solution of a water-soluble polymer 2; the water-soluble polymer 2 includes at least one of sodium hyaluronate, carbomer, and xanthan gum;

[0015] The condom body comprises an integrally formed open end, a tubular body and a closed end in sequence; the condom body is divided into a male side and a female side according to the inside and outside;

[0016] The preparation method of the double-layer affinity lubricating condom comprises the following steps:

[0017] a) applying a liquid affinity layer lubricant to the female side of the tubular body of the condom, and rolling the condom body from the female side open end to the female side closed end to the junction of the tubular body and the closed end;

[0018] b) dripping a liquid lubricating layer lubricant on the female side of the closed end of the condom body, sealing and packaging, and obtaining the double-layer affinity lubricating condom.

[0019] The present invention draws on the method of affinity coating, and two lubricants are coated on the film of the natural rubber latex condom body. An aqueous lubricant (liquid affinity layer lubricant) with good compatibility with the natural rubber film of the condom body is used as the affinity layer. The water-soluble polymer used as the affinity layer has good compatibility and adhesion with the natural rubber film; an aqueous lubricant (liquid lubricating layer lubricant) with excellent lubricating properties is used as the lubricating layer. In this way, while solving the compatibility problem between the lubricant and the natural rubber film, the condom can have excellent lubricating properties, extend the lubrication time, and improve the user experience.

[0020] Among them, both lubricants must be liquid lubricants, especially the affinity layer lubricant, and it is obvious that the lubricant layer lubricant needs to be in liquid state to maintain lubrication performance. The affinity layer lubricant must remain in liquid state, because one of the characteristics of high molecular polymer aqueous solution is high viscosity at high concentration. If the affinity layer lubricant is not liquid but solid, it will form a high viscosity and high adhesion jelly in the local area when slowly absorbing water, thereby sticking the rolled condom together and making it impossible to unfold and use.

[0021] In the present invention, the two lubricants are not in direct contact when the condom is not in use. After the female side of the condom body is coated with the affinity layer lubricant, the condom is rolled up; then the lubricant layer lubricant is dripped onto the closed end of the female side of the rolled condom; finally, the entire structure is sealed and packaged in an aluminum-plastic packaging bag or a jelly box, thereby avoiding direct contact between the two lubricants.

[0022] The reason for this complex lubricant application method is:

[0023] After the female side is coated with the affinity layer lubricant coating, if it is in direct contact with the lubricating layer lubricant, the two will gradually merge over time driven by molecular thermal motion and eventually form a homogeneous mixture, which will reduce the compatibility of the lubricant and the film, and at the same time reduce the lubricating properties of the lubricant, thereby losing the original intention of the present invention.

[0024] The condom coated with the affinity layer lubricant on the female side is first rolled into a roll, and then the lubricant is dripped onto the closed end on the female side. At this time, the only possible contact between the coating of the affinity layer lubricant and the outside world and the lubricant is a narrow gap (the boundary between the tubular body and the closed end). Due to the poor compatibility of the lubricant in the lubricant layer and the rubber film of the condom body, it cannot penetrate into the inside through the narrow gap through capillary action; and due to the liquid seal formed by the lubricant in the narrow gap, the affinity layer lubricant will not dry up due to water evaporation, resulting in a jelly-like substance sticking to the condom.

[0025] With the above structure, when not in use, the affinity layer lubricant pre-applied on the female side and the lubricating layer lubricant added later form a natural isolation and will not affect each other; when unfolded for use, the lubricating layer lubricant will gradually distribute on the female side as the unfolding action occurs. At this time, within a short period of time (during use), the two lubricants will still play their respective roles, forming a double-layer affinity lubrication effect.

[0026] The double-layer affinity lubricating condom of the present invention uses an affinity layer lubricant having good affinity with the natural rubber film of the condom body, which is an aqueous solution containing at least one of polyvinyl alcohol (PVA), polyvinyl acetate (PVAc), polyvinyl pyrrolidone (PVP) and other water-soluble polymers, with a content of 1-10% and a viscosity of 50-400 mPa·s. The three structural formulas are as follows:

[0027]

[0028] These polymers have a common feature, that is, they all have hydrophobic and lipophilic linear carbon chains, with a large number of hydrophilic groups hanging on one side of the carbon chain. The unique molecular structure makes these polymers extremely water-soluble, both lipophilic and hydrophilic. In a low-concentration solution, these linear molecules fully stretch to form a monomolecular layer on the natural rubber film. The lipophilic linear carbon chain has a good affinity and adsorption capacity with natural rubber, while the outward hydrophilic group provides good hydrophilicity with the lubricating layer, forming a monomolecular affinity layer.

[0029] The lubricating layer lubricant with good lubrication performance used in the double-layer affinity lubricating condom of the present invention is an aqueous solution containing at least one of water-soluble polymers such as sodium hyaluronate, carbomer, xanthan gum, etc. The characteristic of this type of high molecular polymer is that the high molecular itself can combine with a large number of water molecules to form a hydrogel-like substance. This type of hydrogel substance has very good lubrication performance and is an excellent material for preparing the lubricating layer.

[0030] In a preferred embodiment, the condom is a latex condom, more preferably a natural rubber latex condom.

[0031] In a preferred embodiment, the mass concentration of the aqueous solution of the water-soluble polymer 1 is 1-10%.

[0032] In a preferred embodiment, the mass concentration of the aqueous solution of the water-soluble polymer 2 is 0.1-5%.

[0033] In a preferred embodiment, the preparation method comprises the following specific steps:

[0034] 1) Producing the condom body by dipping method;

[0035] 2) putting the condom body on the stainless steel electric inspection mold, and after the electric inspection, applying the liquid affinity layer lubricant to the female side surface of the tubular body of the condom body by transfer coating method to obtain the condom body coated with the liquid affinity layer lubricant;

[0036] 3) using a winding roller to roll up the condom body coated with the liquid affinity layer lubricant prepared in step 2) into a roll, thereby obtaining a rolled condom body;

[0037] 4) dripping a liquid lubricating layer lubricant onto the female side of the closed end of the rolled condom body prepared in step 3), and performing heat-pressing sealing and packaging to obtain the double-layer affinity lubricating condom.

[0038] In a preferred embodiment, in step 2), the transfer coating method includes a distributed coating method or a dot matrix transfer coating method, more preferably a dot matrix transfer coating method.

[0039] In a preferred embodiment, in step 2), the coating amount of the liquid affinity layer lubricant is 5-120 mg / each, more preferably 25-120 mg / each.

[0040] In a preferred embodiment, in step 2), the coating amount of the liquid affinity layer lubricant is 5, 25, 50, 75, 100 and 120 mg / each.

[0041] In a preferred embodiment, in step 2), the coating area of ​​the liquid affinity layer lubricant is the cylindrical surface from the condom opening end to 160 mm away from the condom opening end.

[0042] In a preferred embodiment, in step 4), the amount of the liquid lubricating layer lubricant added is 400-1800 mg / each, more preferably 400-1800 mg / each.

[0043] In a preferred embodiment, in step 4), the amount of the liquid lubricating layer lubricant added is 100, 400, 600, 900, 1200, 1500 and 1800 mg / each.

[0044] In a preferred embodiment, in step 4), the packaging is packaging the condoms in an aluminum-plastic packaging bag or a jelly box.

[0045] In a preferred embodiment, the aluminum-plastic packaging bag or jelly box is a packaging structure that can isolate the male side and the female side of the condom in a sealed state.

[0046] In a preferred embodiment, in step 4), the container used for packaging is the container used in patent CN109928062B.

[0047] In a second aspect, the present invention provides a double-layer affinity lubricating condom using a water-soluble lubricant prepared by the aforementioned preparation method.

[0048] In the manufacturing method provided by the present invention, the key step is to evenly apply the affinity layer lubricant to the female side surface of the tubular condom body before the condom body is rolled up. The transfer coating method has been proven to be an effective method. The patent "An online lubricant coating device in the condom production process" (authorization announcement number CN210675734U) and the patent "An improved condom lubricant online coating device" (authorization announcement number CN213222962U) that the patentee of the present invention has obtained authorization explain in detail the method, advantages and practicality of transfer coating and coating dot matrix. Dot matrix coating blocks can optimize the uniformity of lubricant coating and is an effective solution for small-dose coating.

[0049] In the present invention, the affinity layer lubricant is coated on the female side surface of the tubular body of the condom body. The affinity layer lubricant only needs to form a monomolecular affinity layer on the surface of the natural rubber film of the condom. Too much affinity layer lubricant will affect the effective lubrication of the lubricant layer. Preferably, the coating amount of the affinity layer lubricant is 5-120 mg / piece.

[0050] In the scheme of the present invention, the affinity layer lubricant is coated on the female side surface of the tubular body of the condom body, and then the condom is rolled down by a take-up roller. In the traditional condom production process, at this time, the condoms rolled into a roll are stacked together. If the closed end of the female side of the condom is also coated with lubricant at this time, the affinity layer lubricant on the stacked rolled condoms will transfer to each other, thereby causing inconvenience to the subsequent production process. Therefore, preferably, the coating of the affinity layer lubricant is only coated on the cylindrical surface from the open end of the condom to 160mm away from the open end of the condom, that is, only the body is coated, and the closed end of the rolled condom is not coated.

[0051] In the scheme of the present invention, after the condom coated with the affinity layer lubricant is rolled into a roll, a lubricating layer lubricant with excellent lubrication performance is dripped on the closed end of the female side of the rolled condom body. According to the current needs of different consumers, the preferred amount of the lubricating layer lubricant is 400-1800 mg / piece.

[0052] In the scheme provided by the present invention, the affinity layer lubricant and the lubricating layer lubricant are naturally isolated from each other during the sealed packaging and will not contact each other; only when the user unfolds it for use, the lubricating layer lubricant will be distributed on the affinity layer of the condom body as the condom is unfolded. However, this is an ideal perfect state. In fact, due to the fluctuations of factors such as molds, equipment, processes, and even the environment used in the condom production process, each product cannot achieve this perfect state 100%, and there will be some influences more or less. Although it will not have a fatal impact on the double-layer affinity lubrication performance, it will reduce the user's experience expectations. Therefore, preferably, the use of a packaging structure that can isolate the male side and the female side of the condom in a sealed state can effectively eliminate these adverse effects. The patent "A Condom System and Its Packaging Method" (Authorization Announcement No. CN109928062B) previously authorized by the patentee of the present invention elaborates in detail the packaging structure that can effectively isolate the male side and the female side of the condom after sealed packaging. The use of this packaging structure can ensure that the condom of the present invention presents a perfect affinity lubrication effect when used.

[0053] The beneficial effects of the present invention are:

[0054] 1. The present invention draws on the solution of affinity coating, and proposes a special formula and a method matching the actual production mode of condoms according to the material and manufacturing process characteristics of condom products, thereby solving the problem of reduced lubrication performance caused by poor compatibility between condoms and water-soluble lubricants. At the same time, the condoms can be mass-produced on existing equipment, and the use process is no different from that of ordinary condoms, which has high practical value.

[0055] 2. The present invention coats two kinds of lubricants on the film of the natural rubber latex condom body, and adopts an aqueous lubricant (liquid affinity layer lubricant) with good compatibility with the natural rubber film of the condom body as the affinity layer. The water-soluble polymer used as the affinity layer has good compatibility and adhesion with the natural rubber film; an aqueous lubricant (liquid lubricating layer lubricant) with excellent lubricating properties is adopted as the lubricating layer, which can solve the compatibility problem between the lubricant and the natural rubber film while making the condom have excellent lubricating properties, prolong the lubrication time, and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 Schematic diagram of the manufacturing process of double-layer affinity lubricated condoms;

[0057] Figure 2 A schematic diagram of the process of dripping lubricant onto a rolled condom;

[0058] Figure 3 A comparison chart of the manufacturing process of double-layer affinity lubricated condoms and conventional water-based lubricated condoms;

[0059] Among them: 1-female side of condom, 2-affinity layer lubricant, 3-condom rolled into a roll, 4-closed end of female side of rolled condom, 5-lubricant of lubricating layer, 6-curling slit of rolled condom. DETAILED DESCRIPTION

[0060] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention.

[0061] Figure 1-3 The present invention shows the manufacturing process of the double-layer affinity lubricating condom using a water-soluble lubricant. Figure 1As shown, after the coating 2 of the affinity layer lubricant is applied to the female side 1 of the condom body, the condom is rolled up into a roll; then the lubricant layer lubricant 5 is dripped on the female side closed end 4 of the rolled condom 3; finally, the entire structure is sealed and packaged in an aluminum-plastic packaging bag or a jelly box. The condom coated with the affinity layer lubricant coating on the female side is first rolled into a roll, and then the lubricant layer lubricant is dripped on the female side closed end. At this time, the only way for the coating of the affinity layer lubricant to contact the outside world and the lubricant layer lubricant is a circle of narrow slits 6 (the boundary between the tubular body and the closed end). Due to the poor compatibility of the lubricant layer lubricant with the condom body film, it cannot penetrate from the slit into the inside through capillary action; and due to the liquid seal formed by the lubricant layer lubricant at the slit, the affinity layer lubricant will not dry up due to water evaporation, resulting in a jelly-like substance sticking to the condom. Therefore, the two lubricants in the double-layer affinity lubricating condom of the present invention are not in direct contact when the condom is not in use.

[0062] Figure 3 It shows the entire manufacturing process of double-layer affinity lubricated condoms, the position of each step in the traditional condom production process, and the comparison with the conventional condom manufacturing process.

[0063] It is worth noting that the raw materials used in the present invention are all common commercially available products, and their sources are not specifically limited.

[0064] in:

[0065] Sodium hyaluronate: low molecular weight 200,000-400,000, purchased from Shangda Biotechnology Co., Ltd.

[0066] Polyvinyl pyrrolidone: K30, purchased from Jinan Jinsheng New Materials Co., Ltd.;

[0067] Polyvinyl alcohol: PVA-217, purchased from Guangdong Nissin Technology Co., Ltd.;

[0068] Carbomer: Carbomer 980, purchased from Guangzhou Shengruixiang Import and Export Co., Ltd.;

[0069] Polyvinyl acetate: purchased from Jinan Yingxin Chemical Co., Ltd.

[0070] Other raw materials are commercially available.

[0071] Example 1

[0072] After the dip-molded natural rubber latex wool product condom (i.e. the condom body) is electro-tested on the electro-test mold, 5, 25, 50, 75, 100, and 120 mg of an affinity layer lubricant is applied to the female side of the body (from the open end to the cylindrical surface 160 mm away from the open end) in a distributed coating manner. The affinity layer lubricant is an aqueous solution of polyvinyl pyrrolidone with a mass concentration of 5%; after winding, 800 mg of a lubricating layer lubricant is dripped on the closed end on the female side. The lubricating layer lubricant is an aqueous solution of sodium hyaluronate with a mass concentration of 2%; and then the condom is sealed and packaged in an aluminum-plastic film packaging bag.

[0073] The samples are numbered A-1, A-2, A-3, A-4, A-5 and A-6, and the characteristics of the samples are shown in Table 1.

[0074] Table 1

[0075]

[0076] Example 2

[0077] After the dip-molded natural rubber latex wool product condom (i.e. the condom body) is electro-tested on an electro-test mold, 50 mg of an affinity layer lubricant is coated on the female side of the body (from the open end to the cylindrical surface 160 mm away from the open end) in a distributed coating manner, and the affinity layer lubricant is an aqueous solution of polyvinyl alcohol with a mass concentration of 5%; after winding, 100, 400, 600, 900, 1200, 1500, and 1800 mg of a lubricating layer lubricant is dripped on the closed end on the female side, and the lubricating layer lubricant is an aqueous solution of carbomer with a mass concentration of 2%; and then the condoms are sealed and packaged in aluminum-plastic film packaging bags.

[0078] The samples are numbered B-1, B-2, B-3, B-4, B-5, B-6 and B-7, and the characteristics of the samples are shown in Table 2.

[0079] Table 2

[0080]

[0081] Example 3

[0082] After the dip-molded natural rubber latex wool product condom is electro-tested on the electro-test mold, 25, 50 mg of affinity layer lubricant is applied on the female side of the body (from the open end to the cylindrical surface 160 mm away from the open end), and the affinity layer lubricant is an aqueous solution of polyvinyl acetate with a mass concentration of 5%; after winding, 800 mg of lubricating layer lubricant is dripped on the closed end on the female side, and the lubricating layer lubricant is an aqueous solution of sodium hyaluronate with a mass concentration of 2%; and then the condom is sealed and packaged in an aluminum-plastic film packaging bag.

[0083] When applying the affinity layer lubricant on the female side of the body, two coating methods, distributed coating and dot-matrix coating, are used.

[0084] The samples are numbered C-1, C-2, C-3, and C-4, and their characteristics are shown in Table 3.

[0085] Table 3

[0086]

[0087] Example 4

[0088] After the dip-molded natural rubber latex wool product condom is electro-tested on an electro-test mold, 50 mg of an affinity layer lubricant is coated on the female side of the body (from the opening end to the cylindrical surface 160 mm away from the opening end) in a distributed coating manner and a dot matrix coating manner. The affinity layer lubricant is an aqueous solution of polyvinyl pyrrolidone with a mass concentration of 5%; after winding, 800 mg of a lubricating layer lubricant is dripped on the head side of the female side. The lubricating layer lubricant is an aqueous solution of carbomer with a mass concentration of 2%; and then the condom is sealed and packaged in a jelly box with the function of isolating the male side and the female side.

[0089] The samples are numbered D-1 and D-2, and their characteristics are shown in Table 4.

[0090] Table 4

[0091]

[0092] Comparative Example 1

[0093] A conventional water-soluble lubricating condom, denoted as S-0, is different from Example 1 in that no affinity layer lubricant is coated on the condom, and the rest is the same as Example 1.

[0094] Comparative Example 2

[0095] The same procedures as in Example A-4 are described as S-1, except that 75 mg of a lubricating layer lubricant (an aqueous solution of sodium hyaluronate with a mass concentration of 2%) is applied on the female side of the body (from the open end to the cylindrical surface 160 mm away from the open end) in a distributed coating manner, and 800 mg of an affinity layer lubricant (an aqueous solution of polyvinyl pyrrolidone with a mass concentration of 5%) is dripped on the closed end on the female side.

[0096] Comparative Example 3

[0097] Except that the affinity layer lubricant and the lubricating layer lubricant are both a mixed aqueous solution of 5 wt % polyvinyl pyrrolidone and 2 wt % sodium hyaluronate, the rest is the same as Example A-4, denoted as S-2.

[0098] Comparative Example 4

[0099] Except that the affinity layer lubricant and the lubricating layer lubricant are both 5 wt % aqueous solution of polyvinyl pyrrolidone, the rest is the same as Example A-4, denoted as S-3.

[0100] Comparative Example 5

[0101] Except that the affinity layer lubricant and the lubricating layer lubricant are both 2 wt % aqueous solution of sodium hyaluronate, the rest is the same as Example A-4, denoted as S-4.

[0102] Test Case

[0103] 1. Experiencer Rating

[0104] In view of the fact that the target product of the present invention is a condom, and the target technical effect is to improve the user's experience (lubrication time can also be included in the category of experience), the evaluation is carried out by using the experience scoring method, including the lubrication during use, the lubrication duration during use (lubrication time), the comfort of use, and the overall experience. The specific scoring criteria are as follows:

[0105]

[0106] The conventional water-soluble lubricant condom (denoted as S-0, which is different from Example 1 in that the affinity layer lubricant is not coated, and the rest is the same as Example 1, i.e., Comparative Example 1) is used as the benchmark with 1 point, the highest score is 5 points, and the lowest score is 0 points. Although the subjective individual differences in human experience are large, when the sample size is large enough, the statistical results can still illustrate the improvement effect.

[0107] The samples of Example 1-4 and Comparative Example 2-5 were distributed to 50 testers, and conventional water-soluble lubricant condoms (Comparative Example 1) were provided as comparative samples. The testers were asked to rate the condoms based on their experience, with S-0 being 1 point for the same level and 5 points for the highest. The results are shown in Table 5.

[0108] Table 5 Summary of the tester evaluation scores of all samples of Examples 1-4 and Comparative Examples 2-5 and Comparative Sample S-0

[0109] serial number Average lubricity score Average score of lubrication time Average comfort score Average overall experience score S-0 1 1 1 1 S-1 1.3 1.8 1.7 1.7 S-2 1.5 1.3 2.0 1.8 S-3 0.8 0.4 0.2 0.3 S-4 1.2 1.7 1.9 1.8 A-1 1.2 1.8 1.6 1.9 A-2 3.2 3.6 3.9 4.1 A-3 4.8 4.8 4.2 4.5 A-4 4.8 4.9 4.3 4.3 A-5 4.5 4.9 4.7 4.1 A-6 4.9 4.3 4.2 3.9 B-1 1.3 1.2 2.3 2.6 B-2 3.1 3.4 3.4 4.1 B-3 4.3 4.5 4.5 4.5 B-4 4.5 4.1 4.5 4.4 B-5 4.5 4.3 4.5 4.5 B-6 4.8 4.7 4.3 4.4 B-7 4.5 4.5 4.3 4.6 C-1 3.3 3.5 3.4 3.5 C-2 4.8 4.5 4.2 4.5 C-3 3.3 3.8 3.3 3.5 C-4 3.3 4.0 4.3 4.5 D-1 4.6 4.9 4.5 4.5 D-2 4.5 4.5 4.7 4.6

[0110] As can be seen from Table 5, the double-layer affinity lubricating condoms using water-soluble lubricants prepared in Examples 1-4 of the present invention have better scores than conventional water-soluble lubricating liquid condoms (denoted as S-0), indicating that they have better lubricity.

[0111] In addition, by comparing condoms A-4 and S-0, S-1, S-2, S-3 and S-4, it can be seen that the composition and preparation process of the lubricant have a great influence. The lubrication effect and user experience of the condom can be greatly improved by using the affinity layer lubricant and the lubricating layer lubricant in combination and following the preparation process defined in the present invention.

[0112] 2. Lubrication performance: The condoms of Examples A-4, A-6, B-3, C-4, D-2 and Comparative Examples 1-5 were placed at room temperature for half a year. The friction coefficients of the condoms in the above groups were tested before and after being placed for half a year. The friction coefficients of the condoms were measured with reference to the method of GB10006-88. Specifically, a stainless steel mold with condoms was placed in a container filled with physiological saline and fixed vertically on a friction coefficient tester. At the same time, a 2 Newton force was applied to the condom on the surface through a rubber-plated annular fixture. The measurement range of the friction coefficient tester was 0-5 Newtons. When the mold moved at a speed of 150 mm / min, the dynamic friction coefficient was measured; the lower the friction coefficient, the better the lubrication performance.

[0113] Table 6 Friction coefficient of each group of condoms

[0114]

[0115] It can be seen from Table 6 that the friction coefficient of the condoms prepared in the examples is less than 0.1, and they have good lubricity, while the friction coefficient of the condoms prepared in the comparative examples is greater than 0.3, and after being placed for half a year, the friction coefficients of the condoms S-1, S-2 and S-3 in the comparative examples increase significantly, and their lubricity and stability decrease significantly.

[0116] It can be seen that the composition and preparation process of the lubricant have a great influence on the lubrication performance and stability of the condom. The lubrication effect and stability of the condom can be greatly improved by using the affinity layer lubricant and the lubricating layer lubricant in combination and following the preparation process defined in the present invention.

[0117] It should be noted that the above-described specific embodiments can enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. Therefore, although the present invention has been described in detail with reference to the drawings and embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. In short, all technical solutions and changes that do not deviate from the spirit and scope of the present invention should be included in the protection scope of the patent of the present invention.

Claims

1. A method for preparing a double-layer affinity lubricating condom using a water-soluble lubricant, characterized in that: The condom comprises a condom body and a water-soluble lubricant; the water-soluble lubricant is a liquid affinity layer lubricant and a liquid lubricating layer lubricant; The liquid affinity layer lubricant is an aqueous solution of a water-soluble polymer 1; the water-soluble polymer 1 is at least one of polyvinyl alcohol, polyvinyl acetate, and polyvinyl pyrrolidone; The liquid lubricating layer lubricant is an aqueous solution of a water-soluble polymer 2; the water-soluble polymer 2 is at least one of sodium hyaluronate, carbomer, and xanthan gum; The condom body comprises an integrally formed open end, a tubular body and a closed end in sequence; the condom body is divided into a male side and a female side according to the inside and outside; The preparation method of the double-layer affinity lubricating condom comprises the following steps: a) applying a liquid affinity layer lubricant to the female side of the tubular body of the condom, and rolling the condom body from the female side open end to the female side closed end to the junction of the tubular body and the closed end; b) dripping a liquid lubricating layer lubricant on the female side of the closed end of the condom body, sealing and packaging, and obtaining the double-layer affinity lubricating condom; The condom is a latex condom; The mass concentration of the aqueous solution of the water-soluble polymer 1 is 1-10%; The mass concentration of the aqueous solution of the water-soluble polymer 2 is 0.1-5%; In step a), the coating amount of the liquid affinity layer lubricant is 50-120 mg / condom; the coating area of ​​the liquid affinity layer lubricant is the cylindrical surface from the condom opening end to 160 mm away from the condom opening end; In step b), the amount of the liquid lubricating layer lubricant added is 400-1800 mg / each.

2. The preparation method according to claim 1, characterized in that The specific steps of the preparation method are as follows: 1) Producing the condom body by dipping method; 2) putting the condom body on the stainless steel electric inspection mold, and after the electric inspection, applying the liquid affinity layer lubricant to the female side surface of the tubular body of the condom body by transfer coating method to obtain the condom body coated with the liquid affinity layer lubricant; 3) using a winding roller to roll up the condom body coated with the liquid affinity layer lubricant prepared in step 2) into a roll, thereby obtaining a rolled condom body; 4) Dropping a liquid lubricating layer lubricant on the female side of the closed end of the rolled condom body prepared in step 3), and sealing and packaging by heat pressing to obtain the double-layer affinity lubricating condom.

3. The preparation method according to claim 2, characterized in that: In step 2), the transfer coating method includes a distributed coating method or a dot matrix transfer coating method.

4. The preparation method according to claim 2, characterized in that: The packaging is to pack the condom in an aluminum-plastic packaging bag or a jelly box.

5. The preparation method according to claim 4, characterized in that: The aluminum-plastic packaging bag or jelly box is a packaging structure that can isolate the male side and the female side of the condom in a sealed state.

6. A double-layer affinity lubricating condom using a water-soluble lubricant prepared by the preparation method according to any one of claims 1 to 5.

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