Double-layer plant essential oil spray with mosquito repellent effect and preparation method thereof

Abstract

The present invention relates to a double-layer plant essential oil spray with mosquito repellent effect and a preparation method thereof, wherein the double-layer plant essential oil spray with mosquito repellent effect comprises a water layer and an oil layer located above the water layer, wherein the oil layer comprises menthyl glycol, isononyl isononanoate and a plant flavoring agent. The double-layer plant essential oil spray of the present application does not add chemical repellents, and uses plant-derived menthyl glycol as a core component to play a role in repellent protection, while adding plant flavoring agents lemongrass leaf oil and menthol to play a mosquito repellent synergistic effect. In addition, the double-layer plant essential oil spray of the present application uses an emollient isononyl isononanoate as a solubilizer for menthyl glycol, and utilizes the incompatibility of oil and water and the difference in specific gravity of oil and water to form a layered appearance of oil on top and water on the bottom. The double-layer plant essential oil spray of the present invention can restore the layered state in a relatively short time by standing after being shaken and used.

Description

Technical Field

[0001] The invention belongs to the technical field of mosquito repellent, and relates to a double-layer plant essential oil spray with mosquito repellent effect and a preparation method thereof. Background Art

[0002] In the hot summer, there will be a large number of mosquitoes. Anti-mosquito is a problem we must solve. After being bitten by mosquitoes, the skin surface will be red, swollen, and blistered, accompanied by severe itching. After scratching, the skin is prone to ulceration, infection, and pus discharge. If it is repeatedly stimulated for a long time, it is easy to form small nodules and lichenification. In order to prevent mosquito bites, most people will choose to use mosquito repellent products to achieve the purpose of mosquito repellent. Mosquito repellent spray products are essential outdoor products for daily mosquito repellent, especially in summer. However, mosquito repellent sprays on the market (mainly mosquito repellent floral water and mosquito repellent liquid) all contain chemical repellents, and the dosage form is single and the appearance is relatively homogeneous. Synthetic mosquito repellent ingredients can keep mosquitoes away from or out of contact with the biting target. Although it is highly effective in repelling pests, it also leaves many problems. Practice has proved that with the large-scale use of chemical mosquito repellents, mosquito resistance is becoming more and more serious.

[0003] At present, researchers have found that some secondary metabolites of plants have obvious effects in mosquito control, and are safe for humans and animals, not easy to develop drug resistance, and easy to degrade in the natural environment. Mosquito repellent plant extracts have become a research topic for researchers at home and abroad. At present, most of the mosquito repellent products on the market contain chemical ingredients such as DEET and methoxythrin, which have certain effects on human health if used for a long time. Existing products containing natural plant ingredients have the problems of short mosquito repellent time and unsatisfactory storage stability.

[0004] Therefore, a care product containing natural mosquito repellent ingredients is developed to meet the demand for mosquito repellent and mosquito prevention. In addition to excellent efficacy, a novel appearance is also one of the consumer's needs. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a double-layer plant essential oil spray with mosquito repellent effect and a preparation method thereof.

[0006] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a double-layer plant essential oil spray with mosquito repellent effect, wherein the double-layer plant essential oil spray with mosquito repellent effect comprises a water layer and an oil layer located above the water layer, wherein the oil layer comprises menthyl glycol, isononyl isononanoate and a plant flavoring agent.

[0008] The present invention uses menthanediol as the core active ingredient. Menthanediol, also known as p-menthane-3,8-diol, is a plant-derived repellent extracted and processed from lemon eucalyptus oil. It is an effective natural source mosquito repellent ingredient approved by the U.S. Environmental Protection Agency EPA. Menthanediol can form a protective barrier on the skin, affecting the receptors such as the mosquito olfactory perception system, thereby playing a role in repelling and protecting. Plant flavoring agents are also added to the plant essential oil spray of the present invention, and there is a certain synergistic effect between menthanediol and the plant flavoring agent in the mosquito repellent effect.

[0009] In the present invention, the emollient isononyl isononanoate is used to solubilize menthanediol without adding an emulsifier, and due to the incompatibility of oil and water and the difference in specific gravity of oil and water, a layered appearance of oil on top and water on the bottom is formed. The double-layer plant essential oil spray has a novel appearance dosage form and has a better mosquito repellent effect than a single-phase mosquito repellent spray with a uniform appearance. The double-layer plant essential oil spray of the present invention can restore the layered state in a relatively short time by standing still after being shaken and used.

[0010] Preferably, the aqueous layer comprises sodium chloride and water;

[0011] The addition of sodium chloride improves the stability of the double-layer plant essential oil spray with mosquito repellent effect.

[0012] Preferably, the mass percentages of menthyl glycol, isononyl isononanoate, and plant flavoring agent in the double-layer plant essential oil spray with mosquito repellent effect are 4-12%, 12-30%, and 0.5-4%, respectively;

[0013] When menthyl glycol, isononyl isononanoate and plant fragrance agent in the double-layer plant essential oil spray with mosquito repellent effect are combined in the above-mentioned specific weight ratio, the effect in mosquito repellent can be maximized.

[0014] The mass percentage of the menthanediol can be selected from 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, etc.; the mass percentage of the isononyl isononanoate can be selected from 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, etc.; the mass percentage of the plant flavoring agent can be selected from 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, etc. Other specific point values ​​within the above numerical range can be selected, which will not be repeated here.

[0015] Preferably, the mass percentage of sodium chloride in the double-layer plant essential oil spray with mosquito repellent effect is 1-3%, for example 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, 2.2%, 2.4%, 2.6%, 2.8%, 3%, etc. Other specific point values ​​within the above numerical range can be selected, which will not be repeated here.

[0016] When sodium chloride is added at the above specific mass percentage, the system stability is the best.

[0017] Preferably, the pH value of the double-layer plant essential oil spray water layer with mosquito repellent effect is 4.0-5.5, for example, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5, 5.1, 5.2, 5.3, 5.4, 5.5, etc. Other specific point values ​​within the above numerical range can be selected, which will not be described one by one here.

[0018] Preferably, the plant flavoring agent includes any one of lemon eucalyptus oil, linalool oil, lavender oil, menthol, eucalyptus essential oil or lemongrass leaf oil, or a combination of at least two thereof; more preferably, it is a combination of menthol and lemongrass leaf oil.

[0019] Menthol and lemongrass leaf oil in the plant flavoring agent have a synergistic effect on the improvement of mosquito repellent effect that is difficult for those skilled in the art to predict. Lemongrass leaf oil is a leaf extract of lemongrass, also known as lemongrass and citronella, and is a well-known mosquito repellent essential oil with the characteristic aroma of lemongrass and a pleasant smell. Menthol has a special refreshing aroma and can also give a cool feeling, improving people's experience of use.

[0020] Preferably, the mass percentage of menthol in the double-layer plant essential oil spray with mosquito repellent effect is 0.5-3%, and the mass percentage of lemongrass leaf oil is 0.1-1%.

[0021] When menthol and lemongrass leaf oil are added in the above specific mass percentages, the mosquito repellent effect is best.

[0022] The mass percentage of the menthol can be selected from 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, etc., and the mass percentage of the lemongrass leaf oil can be selected from 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc. Other specific point values ​​within the above numerical range can be selected, which will not be repeated here one by one.

[0023] Preferably, the double-layer plant essential oil spray with mosquito repellent effect further comprises any one of a preservative, a skin conditioner, a stabilizer or a pH conditioner, or a combination of at least two thereof.

[0024] Preferably, the mass percentages of preservatives, skin conditioners and stabilizers in the double-layer plant essential oil spray with mosquito repellent efficacy are 0.2-0.5%, 1-3% and 0.1-1% respectively.

[0025] The mass percentage of the preservative can be selected from 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, etc., the mass percentage of the skin conditioner can be selected from 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, 3%, etc., the mass percentage of the stabilizer can be selected from 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc. Other specific point values ​​within the above numerical range can be selected, which will not be repeated here.

[0026] Preferably, the skin conditioning agent includes a water-soluble skin conditioning agent and an oil-soluble skin conditioning agent.

[0027] Preferably, the water-soluble skin conditioning agent comprises gentian extract and / or butylene glycol.

[0028] Preferably, the oil-soluble skin conditioning agent comprises any one of sunflower seed oil, carrot root extract, carrot seed oil, β-carotene, ascorbyl palmitate or tocopherol, or a combination of at least two thereof; β-carotene is further preferred.

[0029] An oil-soluble skin conditioner containing β-carotene is added to the upper oil layer. β-carotene is an orange-yellow fat-soluble compound. It is the most common and stable natural pigment in nature. It gives the upper oil phase a characteristic orange-yellow appearance, which contrasts with the lower transparent solution and has a clear double-layer boundary.

[0030] Preferably, the preservative comprises sodium benzoate.

[0031] Preferably, the stabilizer comprises benzotriazolyl dodecyl p-cresol.

[0032] Preferably, the pH adjuster comprises citric acid and / or sodium hydroxide.

[0033] In a second aspect, the present invention provides a method for preparing the double-layer plant essential oil spray with mosquito repellent effect according to the first aspect, the preparation method comprising:

[0034] (1) mixing menthyl glycol, isononyl isononanoate and a plant flavoring agent to obtain an oil phase composition;

[0035] (2) Mix the oil phase composition with water to obtain the product.

[0036] Preferably, step (1) comprises mixing menthyl glycol, isononyl isononanoate and menthol, cooling the mixture, and then mixing the mixture with lemongrass leaf oil;

[0037] Preferably, the mixing of menthyl glycol, isononyl isononanoate and menthol is carried out at 55-75°C; for example, 55°C, 57°C, 60°C, 62°C, 65°C, 67°C, 70°C, 72°C, 75°C, etc. Other specific points within the above numerical range can be selected and will not be described here one by one.

[0038] Preferably, the mixing with lemongrass leaf oil is carried out at 10-45°C; for example, 10°C, 15°C, 20°C, 25°C, 30°C, 35°C, 40°C, 45°C, etc. Other specific points within the above numerical range can be selected and will not be described here one by one.

[0039] Preferably, the oil phase composition is mixed with water at 10-35°C; for example, 10°C, 15°C, 20°C, 25°C, 30°C, 35°C, etc. Other specific points within the above numerical range can be selected and will not be described here one by one.

[0040] Preferably, the cooling further comprises mixing with an oil-soluble skin conditioning agent and / or a stabilizer;

[0041] Preferably, step (2) further comprises mixing with any one or at least two of a preservative, a water-soluble skin conditioning agent or a pH adjusting agent;

[0042] Preferably, the speed of the homogenization is 6000-12000rpm, and the time is 60-90s. The speed can be selected from 6000rpm, 6500rpm, 7000rpm, 7500rpm, 8000rpm, 8500rpm, 9000rpm, 9500rpm, 10000rpm, 10500rpm, 11000rpm, 11500rpm, 12000rpm, etc., and the time can be selected from 60s, 65s, 70s, 75s, 80s, 85s, 90s, etc. Other specific point values ​​within the above numerical range can be selected, and they will not be repeated here one by one.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] (1) In the plant essential oil spray of the present invention, all effective mosquito repellent ingredients are derived from natural plants. Compared with the existing commonly used DEET and pyrethroids, it has better safety and environmental protection, fresh smell, and is increasingly attracting people's attention. The present invention uses menthyl glycol as the core active ingredient. Menthyl glycol, also known as p-menthane-3,8-diol, is a plant-derived repellent extracted and processed from lemon eucalyptus oil. It is an effective natural source mosquito repellent ingredient recognized by the U.S. Environmental Protection Agency EPA. Menthyl glycol can form a protective barrier on the skin, affecting the receptors such as the mosquito olfactory perception system, thereby playing a role in repelling and protecting. In the plant essential oil spray of the present invention, a plant flavoring agent is also added, and there is a certain synergistic effect between menthyl glycol and the plant flavoring agent in the mosquito repellent effect.

[0045] Lemongrass leaf oil is an extract of the leaves of lemongrass, also known as lemongrass and citronella. It is a well-known mosquito repellent essential oil with the characteristic aroma of lemongrass and a pleasant smell. Menthol has a special refreshing aroma and can also give a cooling feeling, improving people's experience of use.

[0046] (2) Menthyl glycol is a water-insoluble, slightly yellowish, opaque crystal at room temperature. In order to prepare a uniformly dissolved preparation, a large amount of ethanol, propylene glycol, butylene glycol, isopropanol, PEG-40 hydrogenated castor oil, PPG-26-butanol polyether-26 and other cosolvents and emulsifiers need to be added. In the present invention, the emollient isononyl isononanoate is used to solubilize menthyl glycol without adding an emulsifier, and due to the incompatibility of oil and water and the difference in the specific gravity of oil and water, a layered appearance of oil on top and water on the bottom is formed. The double-layer plant essential oil spray of the present invention can restore the layered state in a relatively short time by standing after being shaken and used. The double-layer plant essential oil spray has a novel appearance dosage form and has a better mosquito repellent effect than a single-phase mosquito repellent spray with a uniform appearance. DETAILED DESCRIPTION

[0047] In order to further explain the technical means and effects adopted by the present invention, the technical solution of the present invention is further described below in conjunction with the preferred embodiments of the present invention, but the present invention is not limited to the scope of the embodiments.

[0048] The sources of the functional ingredients contained in the products involved in the following embodiments and comparative examples are as follows (only the functional ingredients are reflected, and the necessary auxiliary ingredients contained in other commercially available raw materials are not repeated):

[0049] Menthol was purchased from Anhui Fengle Spice Co., Ltd. under the trade name of Fengle brand natural menthol;

[0050] Lemongrass leaf oil was purchased from Zhangzhou Huiyuan Daily Chemical Raw Materials Co., Ltd. under the trade name of lemongrass oil;

[0051] PEG-40 hydrogenated castor oil is a product purchased from Zhejiang Guoshengyuan Industrial Co., Ltd. under the trade name of SASAN SC-40.

[0052] Example 1

[0053] The present embodiment provides a double-layer plant essential oil spray with mosquito repellent effect. The double-layer plant essential oil spray with mosquito repellent effect includes a water layer and an oil layer located above the water layer. The double-layer plant essential oil spray includes, by mass percentage, 7% menthanediol, 17.5% isononyl isononanoate, 2% menthol, 0.5% lemongrass leaf oil, 2% sodium chloride, 1% β-carotene and the remainder water.

[0054] Its preparation method is:

[0055] (1) mixing menthyl glycol, isononyl isononanoate and menthol, heating to 60° C. and continuously stirring until dissolved, cooling to 30° C., and then mixing with lemongrass leaf oil and β-carotene to obtain an oil phase mixture, which is set aside;

[0056] (2) mixing water and sodium chloride, and homogenizing at 10000 rpm for 75 seconds to obtain an aqueous phase mixture for later use;

[0057] (3) The oil phase mixture and the water phase mixture are mixed at 25° C. to obtain a double-layer plant essential oil spray.

[0058] Example 2

[0059] The present embodiment provides a double-layer plant essential oil spray with mosquito repellent effect. The double-layer plant essential oil spray with mosquito repellent effect includes a water layer and an oil layer located above the water layer. The double-layer plant essential oil spray includes, by mass percentage, 5.5% of menthyl glycol, 28% of isononyl isononanoate, 3% of menthol, 1% of lemongrass leaf oil, 1.5% of sodium chloride, 1% of β-carotene and the remainder of water.

[0060] Its preparation method is:

[0061] (1) mixing menthyl glycol, isononyl isononanoate and menthol, heating to 75° C. and continuously stirring until dissolved, cooling to 45° C., and then mixing with lemongrass leaf oil and β-carotene to obtain an oil phase mixture for later use;

[0062] (2) mixing water and sodium chloride, and homogenizing at 12000 rpm for 60 s to obtain an aqueous phase mixture for later use;

[0063] (3) The oil phase mixture and the water phase mixture are mixed at 30° C. to obtain a double-layer plant essential oil spray.

[0064] Example 3

[0065] The present embodiment provides a double-layer plant essential oil spray with mosquito repellent effect. The double-layer plant essential oil spray with mosquito repellent effect includes a water layer and an oil layer located above the water layer. The double-layer plant essential oil spray includes, by mass percentage, 8.9% of menthyl glycol, 12.5% ​​of isononyl isononanoate, 0.5% of menthol, 0.1% of lemongrass leaf oil, 1% of sodium chloride, 1% of β-carotene and the remainder of water.

[0066] Its preparation method is:

[0067] (1) mixing menthyl glycol, isononyl isononanoate and menthol, heating to 55° C. and continuously stirring until dissolved, cooling to 10° C., and then mixing with lemongrass leaf oil and β-carotene to obtain an oil phase mixture, which is set aside;

[0068] (2) Mix water and sodium chloride, and homogenize at 6000 rpm for 90 seconds to obtain an aqueous phase mixture for later use;

[0069] (3) The oil phase mixture and the water phase mixture are mixed at 10° C. to obtain a double-layer plant essential oil spray.

[0070] Example 4

[0071] This embodiment provides a double-layer plant essential oil spray with mosquito repellent effect, which is different from Embodiment 1 only in that it does not contain menthol, the reduced mass is distributed to the mass of lemongrass leaf oil, and other components and contents remain unchanged.

[0072] The preparation method is similar to that of Example 1.

[0073] Example 5

[0074] This embodiment provides a double-layer plant essential oil spray with mosquito repellent effect, which is different from Example 1 only in that it does not contain lemongrass leaf oil, the reduced mass is distributed to the mass of menthol, and other components and contents remain unchanged.

[0075] The preparation method is similar to that of Example 1.

[0076] Example 6

[0077] This embodiment provides a double-layer plant essential oil spray with mosquito repellent effect, which is different from Embodiment 1 only in that it does not contain sodium chloride, the reduced mass is distributed to the mass of water, and other components and contents remain unchanged.

[0078] The preparation method is similar to that of Example 1.

[0079] Comparative Example 1

[0080] This comparative example provides a double-layer plant essential oil spray with mosquito repellent effect, which is different from Example 1 only in that it does not contain menthyl glycol, the reduced mass is proportionally distributed to the mass of menthol and lemongrass leaf oil, and other components and contents remain unchanged.

[0081] The preparation method is similar to that of Example 1.

[0082] Comparative Example 2

[0083] This comparative example provides a double-layer plant essential oil spray with mosquito repellent effect, which is different from Example 1 only in that it does not contain menthol and lemongrass leaf oil, the reduced mass is allocated to the mass of menthyl glycol, and other components and contents remain unchanged.

[0084] The preparation method is similar to that of Example 1.

[0085] Comparative Example 3

[0086] The present comparative example provides a double-layer plant essential oil spray with mosquito repellent effect, wherein the double-layer plant essential oil spray with mosquito repellent effect comprises, by mass percentage, 7% menthyl glycol, 16.5% methylpropanediol, 1% PEG-40 hydrogenated castor oil, 2% menthol, 0.5% lemongrass leaf oil, 2% sodium chloride, 20% ethanol, 1% beta-carotene and the remainder water.

[0087] The preparation method is similar to that of Example 1.

[0088] Comparative Example 4

[0089] This comparative example provides a double-layer plant essential oil spray with mosquito repellent effect, which is different from Example 1 only in that isononyl isononanoate is replaced by ethylhexyl palmitate in equal amounts, and other components and contents remain unchanged.

[0090] The preparation method is similar to that of Example 1.

[0091] Comparative Example 5

[0092] This comparative example provides a double-layer plant essential oil spray with mosquito repellent effect, which is different from Example 1 only in that isononyl isononanoate is replaced by isohexadecane in equal amounts, and other components and contents remain unchanged.

[0093] The preparation method is similar to that of Example 1.

[0094] Test Example 1

[0095] Approach-avoidance experiment

[0096] Test method: Refer to GB / T 13917.9-2009.

[0097] Test samples: Examples 1-5, Comparative Examples 1-3.

[0098] Attack power test:

[0099] 300 test insects are placed in a mosquito cage. The tester exposes 40mm×40mm of skin on the back of his hand, and the rest of the body is tightly covered. Put your hand into the mosquito cage and stay there for 2 minutes. Observe closely. If you find mosquitoes landing, shake your arm to drive them away before their mouthparts pierce your skin. This is counted as one test insect landing. If more than 30 test insects land on the tester and the test insects, their attack power is qualified, and this person and the mosquitoes in this cage can be used for repellent test.

[0100] Approach-avoidance experiment:

[0101] Select 4 testers with qualified attack power (half male and half female, and should not drink alcohol, tea or coffee before and during the test, and should not use products containing fragrances). Draw a 50mm×50mm skin area on the back of each hand, and press 1.5μL / cm on one hand. 2 Apply the repellent to be tested evenly with a dose of 100mg / kg, expose 40mm×40mm of the skin, cover the rest tightly, and use the other hand as a blank control. 1 hour after applying the repellent, put the hand into a mosquito cage with qualified attack power for 2 minutes to observe whether there are mosquitoes coming to land and suck blood. After that, test once every 1 hour. As long as one mosquito comes to suck blood, the repellent is judged to be invalid. Record the effective protection time (h) of the repellent. Perform a control test on the control hand each time. Test insects with qualified attack power can continue the test. If the test insects with unqualified attack power need to be replaced with qualified test insects for testing.

[0102] Table 1

[0103] Test samples Average effective protection time (h) Example 1 5.0 Example 2 4.3 Example 3 4.5 Example 4 3.7 Example 5 3.5 Comparative Example 1 0.5 Comparative Example 2 2.3 Comparative Example 3 4.0

[0104] It can be seen from the data in Table 1 that the double-layer plant essential oil spray of the present invention has good mosquito repellent effect, and menthol and lemongrass leaf oil have a certain synergistic effect in improving the mosquito repellent effect, and the plant flavoring agent and menthyl glycol also have a certain synergistic effect in improving the mosquito repellent effect. A combination of ethanol, methylpropanediol and PEG-40 hydrogenated castor oil is used instead of isononyl isononanoate to prepare a single-phase mosquito repellent spray with a uniform appearance. When the contents of menthyl glycol, menthol and lemongrass leaf oil are the same, the mosquito repellent effect of the double-layer plant essential oil spray is better.

[0105] Test Example 2

[0106] Test samples: Examples 1, 6, and Comparative Examples 4-5.

[0107] Test method: Place the samples to be tested into 30mL transparent PET sample bottles, shake gently to mix the two phases completely, let stand, and observe the stratification state and the clarity of the upper layer after stratification. The test time is 1 hour. Observe once every minute in the first half hour; observe once every 5 minutes from half an hour to one hour.

[0108] Table 2

[0109] Test samples Layered State Clarity after stratification Example 1 4 minutes layering Clear Example 6 4 minutes layering The lower layer is turbid and not completely clear Comparative Example 4 2 minutes layering Clear Comparative Example 5 2 minutes layering Clear

[0110] It can be seen from the data in Table 2 that the double-layer plant essential oil spray provided in Example 1 can be divided into two layers after standing for 4 minutes, and the appearance is relatively clear. The double-layer plant essential oil spray provided in Comparative Examples 4 and 5 has a too fast stratification speed and is inconvenient to use. In Example 6, not adding sodium chloride will result in the lower layer being not completely clear after stratification. This shows that isononyl isononanoate and sodium chloride are very important for the stratified appearance of the double-layer plant essential oil spray.

[0111] Test Example 3

[0112] Stability test

[0113] Test samples: Examples 1, 6, and Comparative Examples 4-5.

[0114] Test method: The double-layer plant essential oil spray provided in Example 1, Example 6 and Comparative Examples 4-5 were respectively set up with 5 groups of tests, and stability tests were performed under high temperature (48°C), low temperature (-18°C), cycle (48°C / normal temperature / -18°C), normal temperature and light conditions for 1 month to observe whether the interface of each group of samples was clear, whether solid matter precipitated from the upper or lower layer of the liquid, whether it became turbid, and other unstable phenomena. The test results are shown in Table 3.

[0115] Table 3

[0116]

[0117] As can be seen from the data in Table 3, the double-layer plant essential oil spray provided in Example 1 was tested for 1 month. Under high temperature, low temperature, circulation, normal temperature and illumination conditions, the upper layer was able to maintain a stable state of a colorless, clear and transparent water layer, and the lower layer was able to maintain a stable state of an orange-yellow clear and transparent oil layer, and the lower layer was able to maintain a stable state of a colorless, clear and transparent water layer, and the stratification boundary was clear, and there was no solid precipitation or turbidity in the upper or lower layer, indicating that the double-layer plant essential oil spray system provided by the present invention was stable. After the double-layer plant essential oil spray provided in Example 6 was placed at room temperature for a period of time, the upper oil layer began to precipitate solid crystals, the interface was unclear, and the product was unstable. After 1 month of testing, the double-layer plant essential oil spray provided in Comparative Example 4 had a stratification interface that became turbid and unclear under low temperature and circulation conditions, and could not be completely stratified. After illumination, the upper oil layer faded from orange to colorless, and the product was unstable. After 1 month of testing, the double-layer plant essential oil spray provided in Comparative Example 5 had a solid crystal precipitation phenomenon in the upper oil layer during the test process under low temperature conditions, and the product was unstable. It is shown that isononyl isononanoate and sodium chloride are very important for maintaining the stability of the product.

[0118] The applicant declares that the present invention illustrates a double-layer plant essential oil spray with mosquito repellent effect and its preparation method through the above embodiments, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0119] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0120] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A double-layer plant essential oil spray with mosquito repellent effect, characterized in that: The double-layer plant essential oil spray with mosquito repellent effect comprises a water layer and an oil layer located above the water layer, wherein the oil layer comprises menthyl glycol, isononyl isononanoate and a plant fragrance agent; the water layer comprises sodium chloride and water; the mass percentage of sodium chloride in the double-layer plant essential oil spray with mosquito repellent effect is 1-3%; The mass percentages of menthyl glycol, isononyl isononanoate and plant fragrance agent in the double-layer plant essential oil spray with mosquito repellent effect are 4-12%, 12-30% and 0.5-4% respectively; The plant flavoring agent is a combination of menthol and lemongrass leaf oil; the mass percentage of menthol in the double-layer plant essential oil spray with mosquito repellent effect is 0.5-3%, and the mass percentage of lemongrass leaf oil is 0.1-1%.

2. The double-layer plant essential oil spray with mosquito repellent effect according to claim 1, characterized in that: The pH value of the double-layer plant essential oil spray water layer with mosquito repellent effect is 4.0-5.

5.

3. The double-layer plant essential oil spray with mosquito repellent effect according to claim 1, characterized in that: The double-layer plant essential oil spray with mosquito repellent effect also includes any one of a preservative, a skin conditioner, a stabilizer or a pH conditioner, or a combination of at least two of them.

4. The double-layer plant essential oil spray with mosquito repellent effect according to claim 3, characterized in that: The mass percentages of the preservative, the skin conditioner and the stabilizer in the double-layer plant essential oil spray with mosquito repellent effect are 0.2-0.5%, 1-3% and 0.1-1% respectively.

5. The double-layer plant essential oil spray with mosquito repellent effect according to claim 3, characterized in that: The skin conditioning agents include water-soluble skin conditioning agents and oil-soluble skin conditioning agents.

6. The double-layer plant essential oil spray with mosquito repellent effect according to claim 5, characterized in that: The water-soluble skin conditioning agent includes gentian extract and / or butylene glycol.

7. The double-layer plant essential oil spray with mosquito repellent effect according to claim 5, characterized in that: The oil-soluble skin conditioning agent includes any one or a combination of at least two of sunflower seed oil, carrot root extract, carrot seed oil, β-carotene, ascorbyl palmitate or tocopherol.

8. The double-layer plant essential oil spray with mosquito repellent effect according to claim 7, characterized in that: The oil-soluble skin conditioning agent is beta-carotene.

9. The double-layer plant essential oil spray with mosquito repellent effect according to claim 3, characterized in that: The preservatives include sodium benzoate.

10. The double-layer plant essential oil spray with mosquito repellent effect according to claim 3, characterized in that: The stabilizer includes benzotriazolyl dodecyl p-cresol.

11. The double-layer plant essential oil spray with mosquito repellent effect according to claim 3, characterized in that: The pH adjuster includes citric acid and / or sodium hydroxide.

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