A sprayable aqueous personal lubricant and its preparation method

Abstract

The present invention belongs to the technical field of chemical products, and specifically relates to a sprayable aqueous personal lubricant and a preparation method thereof. The aqueous personal lubricant of the present invention comprises two components, namely component A and component B; component A includes acidic heteropolysaccharide, polyhydroxy compound, and sodium alginate; component B includes borax, sodium trimetaphosphate, calcium chloride, glyceride, soy lecithin, and an auxiliary emulsifier, etc.; the two components are respectively encapsulated in two independent cavities of a self-mixing sprayer; two suction pipes connected to a hand-pressed spray head are respectively arranged in the two independent cavities. When in use, the hand-pressed spray head is pressed, and the liquids in the two cavities are simultaneously ejected and mixed. After the two components are mixed and contacted, hydrogen bonds are formed between oxygen-containing functional groups and water within and between molecules in an aqueous solution, covalent cross-linking of borate ester is formed between boric acid and hydroxyl groups, and ionic cross-linking is formed between sodium alginate and calcium ions. The cross-linking bonds are rapidly formed within a short time, the viscosity of the mixed components instantaneously increases, and significant viscosity and lubricating efficacy are exhibited.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical products, and particularly relates to an aqueous lubricant and a preparation method thereof. Background Art

[0002] Aqueous personal lubricants are easy to clean, have good affinity with the human body, and have more advantages than silicone-based lubricants in terms of formulation, odor, viscosity adjustment, etc., and have gradually become the mainstream in the market.

[0003] The function of aqueous personal lubricants is mainly to form a flowing lubricating layer and a boundary lubricating film between the surface of the natural body cavity and the friction surface through physical adsorption, intermolecular forces, etc. by polar molecular groups, thereby effectively reducing the frictional resistance between the instrument and the human body cavity. Taking the lubricant for natural latex condoms as an example, in the early stage of lubrication, the flowing lubricating layer plays a major role, and its lubricating effect depends on the viscosity of the lubricant. Therefore, most commercially available personal lubricants are viscous liquids or liquid lubricating gels; as the flowing lubricant is gradually consumed and is not sufficient to form a continuous flowing lubricating layer, the boundary lubricating film formed by the lubricant molecular layer on the surface of the condom plays a major lubricating role, and the lubricating effect depends on the interfacial binding force between the lubricating film and the surface of the condom.

[0004] Therefore, to ensure the lubricating performance of aqueous lubricants, especially lubricants for natural latex condoms, two key factors should be satisfied simultaneously. One is to have a certain viscosity or crosslinking degree to increase the viscosity, thereby promoting the lasting stability of the flowing lubricating layer; the other is to have good physical or chemical binding force with the friction surface (especially the skin surface, natural latex surface).

[0005] In addition, the traditional use methods of personal lubricants all adopt a single coating method, that is, taking out an appropriate amount of the product and applying it to the parts that need to be lubricated, which is troublesome, inefficient, and not urgent. Summary of the Invention

[0006] The present invention aims to provide an aqueous personal lubricant with excellent lubricating performance and convenient use and operation, and a preparation method thereof.

[0007] The aqueous personal lubricant provided by the present invention includes two components, A and B. When applied to the parts that need to be lubricated through a self-mixing spray bottle, a viscous and dynamically cross-linked network flowing lubricating layer can be quickly formed on its surface, and it has excellent water replenishment, moisture retention and lubricating performance. Among them (by weight parts):

[0008] Component A is a lubricating and moisturizing agent, and its components are:

[0009] Acidic heteropolysaccharide: 0.05 - 1 wt.%;

[0010] Polyhydroxy compound: 1 - 30 wt.%;

[0011] Sodium alginate: 0.1 - 5 wt.%;

[0012] The balance is pure water;

[0013] Component B includes a cross - linker and auxiliary materials, wherein:

[0014] The cross - linker includes:

[0015] Borax: 0.01 - 1 wt.%;

[0016] Sodium trimetaphosphate: 0.05 - 2 wt.%;

[0017] Calcium chloride: 0.05 - 0.5 wt.%;

[0018] Glyceride: 0.05 - 0.5 wt.%;

[0019] Soybean lecithin: 0.01 - 0.1 wt.%;

[0020] The auxiliary materials include:

[0021] Emulsifier: 0.02 - 0.2 wt.%;

[0022] Antioxidant: 0.01 - 0.05 wt.%;

[0023] Bactericide: 0.01 - 0.05 wt.%;

[0024] Preservative: 0.01 - 0.05 wt.%;

[0025] The balance is pure water; the weight meets 100%.

[0026] Furthermore:

[0027] The acidic heteropolysaccharide is selected from hyaluronic acid and its derivatives, xanthan gum, pectin, preferably with a molecular weight of 3000 - 3 million.

[0028] The polyhydroxy compound is selected from one or more of polyols, polyol polymers such as polyethylene glycol, and polymers such as polyvinyl alcohol, cellulose ether, and galactan.

[0029] The degree of polymerization of the sodium alginate is preferably 80 - 800.

[0030] The glyceride is preferably an ester formed by the esterification of glycerol and saturated fatty acids.

[0031] The preparation method of the aqueous human lubricant provided by the present invention includes:

[0032] (1) Preparation of Component A

[0033] First, equip the polyhydroxy compound to an aqueous solution with a target concentration, and then gradually add acidic heteropolysaccharide and sodium alginate in sequence. To assist in the complete dissolution of each component, the solution system is stirred evenly at a rotation speed of 800 - 3000 rpm under the condition of 25°C - 70°C.

[0034] (II) Preparation of Component B

[0035] First, equip borax, sodium trimetaphosphate, and calcium chloride to an aqueous solution with a target concentration, heat it up to 25°C - 70°C, and slowly add other auxiliary materials such as glycerol ester, soybean lecithin, and emulsifier in sequence under the state of high-speed stirring (800 - 3000 rpm).

[0036] Encapsulate Components A and B in two independent cavities of a self-mixing sprayer respectively; the two straws connected to the hand-pressed spray head are respectively arranged in the two independent cavities; during use, press the hand-pressed spray head, and the liquids in the two cavities are sprayed out and mixed simultaneously. The structure of the self-mixing sprayer is as shown in the appendix Figure 1 as shown.

[0037] After Components A and B are mixed and contacted, oxygen-containing functional groups and water form intramolecular and intermolecular hydrogen bond crosslinks in the aqueous solution, boric acid and hydroxyl groups form covalent boric acid ester crosslinks, and sodium alginate and calcium ions form ionic crosslinks. These dynamic crosslinks are rapidly formed within a short time (such as 4 - 10 seconds), and the viscosity of the AB mixed component instantaneously increases and exhibits significant viscosity and lubricating efficacy.

[0038] The sprayable aqueous human lubricant of the present invention has the following beneficial effects:

[0039] 1. The human lubricant of the present invention has a two-component A and B. After being applied by a self-mixing spray bottle, it can rapidly form an elastic lubricating gel, and the usage method is convenient and fast;

[0040] 2. After Components A and B are mixed, a large number of oxygen-containing functional groups such as carboxylic acid and hydroxyl form intramolecular and intermolecular dynamic hydrogen bond crosslinks with water in the aqueous solution, covalent crosslinks of phosphate ester and boric acid ester formed by phosphoric acid and boric acid and hydroxyl groups, and ionic crosslinks formed by sodium alginate and calcium ions together form a rich, diverse, and high-density dynamic crosslinking network, endowing the lubricating gel with significant viscoelastic behavior, having both the viscosity of a highly viscous liquid and the solid elasticity of a gel, which is beneficial to improving the lasting stability of the flowing lubricating layer;

[0041] 3. The glycerol ester and soybean lecithin components contained in the human lubricant of the present invention have good compatibility with the skin surface and natural latex, and are more likely to form an adsorbed lubricating film, enhancing the boundary lubrication effect. Description of the Drawings

[0042] Figure 1 It is a structural diagram of a dual-channel self-mixing sprayer.

[0043] Figure 2 For the comparison of the lubrication efficacy of each water-based lubricant.

[0044] Reference numerals in the figure: 11 is the mounting base, 12 is the hand-held spray head, 13 is the straw, and 2 is the bottle body. Detailed implementation mode

[0045] Example 1

[0046] The component A of the personal lubricant of the present invention: 0.1 wt.% of hyaluronic acid, 10 wt.% of glycerol, 5 wt.% of polyvinyl alcohol, 1.5 wt.% of sodium alginate, and pure water; Component B: 0.05 wt.% of boric acid, 0.1 wt.% of calcium chloride, 0.03 wt.% of glyceride, 0.05 wt.% of soy lecithin, 0.08 wt.% of sorbitan monooleate, and pure water.

[0047] Example 2

[0048] The component A of the personal lubricant of the present invention: 0.1 wt.% of xanthan gum, 0.2 wt.% of hydroxyethyl cellulose, 5 wt.% of polyvinyl alcohol, 1 wt.% of sodium alginate, and pure water; Component B: 0.07 wt.% of boric acid, 0.05 wt.% of calcium chloride, 0.03 wt.% of glyceride, 0.05 wt.% of soy lecithin, 0.08 wt.% of sorbitan monooleate, and pure water.

[0049] Comparative example 1

[0050] A water-based personal lubricant product, the main components of which are: water, glycerol, hydroxyethyl cellulose, chlorhexidine gluconate, glucono delta-lactone, methyl paraben, and sodium hydroxide.

[0051] To further illustrate the excellent performance of the two-component spray-type personal lubricant of the present invention, the above examples and comparative examples are subjected to the following verification tests.

[0052] 1. Viscosity

[0053] The viscosities of the liquids in component A and B of the examples and the lubricating fluid of the comparative example were detected by using GB / T 22235-2008 Determination of liquid viscosity, and the viscosity was detected immediately after mixing AB.

[0054] As can be seen from Table 1, before mixing, the viscosity of the sprayable water-based lubricant with two components A and B of the present invention is relatively low. After being applied and mixed by a self-mixing sprayer, a lubricating gel with a viscosity higher than 2000 mPa·s can be instantaneously formed, which benefits from the rich and diverse dynamic cross-linking bonds between the two components. The cross-linking network endows the lubricating gel with significant viscoelasticity, that is, high viscosity inside and toughness to resist external pressure, which helps to improve the lasting stability of the flowing lubrication state of the lubricating gel during use.

[0055] 2. Lubrication performance test

[0056] The sprayable lubricant of the example was sprayed onto the surface of the condom through a self-mixing spray bottle, 0.6 g was sprayed on each condom; the lubricant of the comparative example was coated on the surface of the condom, 0.6 g of lubricant was coated on each condom.

[0057] According to the method in the determination of the coefficient of friction of plastic films and sheets (GB 10006-1988), the dynamic coefficient of friction μ of the lubricants in each example and comparative example was detected. In addition, a linear wear-resistant testing machine was used, with the surface of the latex condom wetted by the lubricant as the test surface and the friction counter surface as pigskin. Under the conditions of a test pressure of 150 kPa and a linear repeated friction speed of 60 times per minute, the dynamic coefficient of friction of the friction surface of the condom was tested every minute to evaluate the lubrication aging of the lubricants of each example and comparative example on the surface of the latex condom.

[0058] From Figure 2 As can be seen from the lubrication performance test results, in the early stage of the cyclic linear friction process, the dynamic coefficient of friction of the sprayable water-based personal lubricants in Example 1 and Example 2 did not change significantly, which indicates that the flowing lubrication formed by the two-component water-based lubricant of the present invention between the friction pairs exhibits excellent toughness and lubrication due to the presence of a large number of dynamic cross-linking bonds. As the friction continues, the flowing lubrication layer loses continuity and fluidity due to continuous consumption, and the dynamic coefficient of friction increases sharply in the middle and late stages. The water-based lubricant of the comparative example has extremely poor affinity with the latex surface and pigskin sebum, and quickly loses its lubrication effect, and the dynamic coefficient of friction finally reaches as high as 1.2. In contrast, after the flowing lubrication layer of the two-component water-based lubricant in the example is consumed, the adsorption lubricating film formed by glycerol esters and lecithin between the latex and pigskin sebum plays a boundary lubrication role. Therefore, in the later stage of the test, the dynamic coefficient of friction of the lubricant in the example increases slowly and is always lower than that of the comparative example.

[0059] 3. Influence of the lubricant on the bursting performance of the condom

[0060] To test whether the sprayable aqueous personal lubricant of the present invention affects the mechanical properties of a condom after being applied to the condom, a condom bursting volume and pressure test was conducted, and a condom without adding any lubricant was used as the control group. The aging test was carried out with reference to the guidance in GB / T7544-2019 and the guidelines for analyzing accelerated aging studies. That is, 300 samples in the examples and comparative examples were placed in an aging oven at 70±2°C for 7 days.

[0061] From Figure 2 It can be seen from the test results of the bursting performance before and after aging that the sprayable aqueous personal lubricant in each example does not affect the bursting performance of the condom after being applied to the condom.

[0062] In summary, the A and B two-component sprayable aqueous lubricant proposed by the present invention can instantaneously form a viscoelastic lubricating gel with a rich dynamic cross-linked network after being mixed and applied, and thus exhibits excellent lubricating efficacy in practical applications.

[0063] Table 1 Dynamic viscosities of the lubricants in the examples and comparative examples

[0064]

[0065] Table 2 Influence of the lubricants in each example on the bursting performance of condoms

[0066]

Claims

1. A sprayable aqueous personal lubricant, characterized in that, It includes two components, A and B, where: Component A is a lubricating and moisturizing agent, and its components are: Acidic heteropolysaccharide: 0.05 - 1 wt.%; Polyhydroxy compound: 1 - 30 wt.%; Sodium alginate: 0.1 - 5 wt.%; The balance is pure water; Component B includes a crosslinking agent and auxiliary materials, where: The crosslinking agent includes: Borax: 0.01 - 1 wt.%; Sodium trimetaphosphate: 0.05 - 2 wt.%; Calcium chloride: 0.05 - 0.5 wt.%; Glyceride: 0.05 - 0.5 wt.%; Soybean lecithin: 0.01 - 0.1 wt.%; The auxiliary materials include: Emulsifier: 0.02 - 0.2 wt.%; Antioxidant: 0.01 - 0.05 wt.%; Bactericide: 0.01 - 0.05 wt.%; Preservative: 0.01 - 0.05 wt.%; The balance is pure water; Components A and B are respectively encapsulated in two independent cavities of a self - mixing sprayer; two suction pipes connected to a hand - pressed spray head are respectively arranged in the two independent cavities; during use, when the hand - pressed spray head is pressed, the components in the two cavities are simultaneously ejected and mixed; In component A: The acidic heteropolysaccharide is selected from hyaluronic acid and its derivatives, xanthan gum, pectin; with a molecular weight of 3000 - 3 million; The polyhydroxy compound is selected from one or more of polyols, polyethylene glycol, polyvinyl alcohol, cellulose ether, galactan; The degree of polymerization of the sodium alginate is 80 - 800; In component B, the glyceride is an ester formed by the esterification of glycerol and saturated fatty acids.

2. A preparation method of the spray - type aqueous human lubricant according to claim 1, characterized in that: (I) Preparation of component A First, the polyhydroxy compound is prepared into an aqueous solution with a target concentration, and then the acidic heteropolysaccharide and sodium alginate are gradually added in sequence. To assist the full dissolution of each component, the solution system is stirred evenly at a speed of 800 - 3000 rpm under the condition of 25°C - 70°C; (II) Preparation of component B First, borax, sodium trimetaphosphate, and calcium chloride are prepared into an aqueous solution with a target concentration, heated to 25°C - 70°C, and under the state of high - speed stirring at 800 - 3000 rpm, glyceride, soybean lecithin, and auxiliary materials are added in sequence.

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