Bath salt and preparation method thereof

Abstract

The invention discloses bath salt and a preparation method thereof. The bath salt is prepared from the following components in parts by mass: 60-75 parts of natural sea salt, 8-15 parts of a plant extract, 5-10 parts of a natural humectant, 1-3 parts of natural essential oil and 0.5-2 parts of a stabilizer, the plant extract is prepared from 2 to 4 parts of lavender extract, 3 to 5 parts of aloe extract and 3 to 6 parts of chamomile extract; the natural humectant comprises 3-6 parts of glycerol and 2-4 parts of honey extract. The bath salt prepared by the invention adopts pure natural components, is mild in property and non-irritant, is suitable for various skin types, and is particularly suitable for safe use of people with sensitive skin. The plant extract and the natural humectant are scientifically proportioned, so that the product can effectively clean and remarkably improve the skin care effect at the same time, and the dual effects of cleaning and maintaining are achieved.

Description

Technical Field

[0001] This invention relates to the field of daily chemical products technology, and in particular to a bath salt and its preparation method. Background Technology

[0002] With increasing awareness of healthy skincare, consumers are demanding higher levels of naturalness and safety in bath products. However, most bath salts on the market currently contain artificial preservatives, fragrances, colorants, and other chemical additives, which may irritate the skin with long-term use, especially unsuitable for people with sensitive skin. Furthermore, some products have limited functionality, emphasizing only cleansing while lacking moisturizing, soothing, or other skincare benefits. In contrast, naturally sourced bath products, due to their gentle, non-irritating nature and alignment with green consumption principles, are gradually becoming the mainstream in the market.

[0003] It is evident that natural bath salts and other existing bath salts still face many challenges in practical applications: (1) Bath salts contain chemical additives, which can easily cause skin irritation, dryness and other problems, and cannot meet the needs of people with sensitive skin and those who pursue natural skin care; (2) The natural ingredients in the formula have poor synergistic effects, and it is difficult to balance cleansing power with moisturizing and soothing effects, and the skin is prone to tightness after use; (3) There are defects in the production process, which leads to uneven dissolution of the product and unsuitable particle hardness, affecting the user experience; (4) Stability and shelf life issues: Natural ingredients are easily affected by the environment, have poor stability, and the product is prone to clumping, deterioration and short shelf life.

[0004] In conclusion, there is an urgent need to optimize formula design and improve production processes to comprehensively enhance product performance and user experience. Summary of the Invention

[0005] To address the aforementioned shortcomings, the present invention aims to provide a bath salt and its preparation method, thereby solving technical problems such as unreasonable component ratios, slow dissolution rates, and short-lasting skincare effects in existing bath salt formulations.

[0006] The objective of this invention is achieved through the following technical solution: A bath salt is prepared from the following components in parts by weight: 60-75 parts natural sea salt, 8-15 parts plant extracts, 5-10 parts natural moisturizer, 1-3 parts natural essential oil and 0.5-2 parts stabilizer; The plant extracts include 2-4 parts lavender extract, 3-5 parts aloe vera extract, and 3-6 parts chamomile extract; The natural moisturizer comprises 3-6 parts glycerin and 2-4 parts honey extract. In this invention, the natural sea salt is unprocessed deep-sea salt that retains minerals and trace elements; plant extracts provide soothing and moisturizing effects; natural moisturizers enhance the skin's ability to retain moisture; natural essential oils have both aromatic and antibacterial properties; and stabilizers improve the stability of the formula.

[0007] Preferably, the natural essential oil includes at least one of tea tree oil and rose oil.

[0008] Preferably, the stabilizer is at least one of natural vitamin E and phytosterols.

[0009] Preferably, the lavender extract is prepared according to the following steps: (1) Select dried lavender buds, crush them and pass them through a 40-60 mesh sieve to obtain coarse lavender powder; (2) Mix the crude lavender powder with an ethanol solution of 70-80 wt% at a material-to-liquid ratio of 1:15-25 g / mL, place it in an ultrasonic extraction tank, set the ultrasonic power to 300-500W, the ultrasonic frequency to 40kHz, the extraction temperature to 45-55℃, the extraction time to 40-60 minutes, and the extraction to be performed twice; combine the two extracts, centrifuge at 4000-5000 r / min for 10-15 minutes, and take the supernatant; (3) The supernatant was concentrated under reduced pressure at a vacuum of -0.08 to -0.09 MPa (gauge pressure) and a temperature of 45 to 50°C to obtain an extract with a relative density of 1.10 to 1.15 (measured at 50°C), and then dried to obtain lavender extract.

[0010] Preferably, the aloe vera extract is prepared according to the following steps: (1) Take fresh Aloe vera leaves, clean and disinfect them, peel them, take the aloe vera gel pulp, and grind it into aloe vera pulp using a colloid mill; (2) Adjust the pH of aloe vera pulp to 4.0~5.0, add 0.1~0.3 parts of pectinase and cellulase complex enzyme (mass ratio 1:1) of aloe vera pulp, and enzymatically hydrolyze in a constant temperature water bath at 40~45℃ for 2~3h; raise the temperature to 90~95℃ and keep it for 5~10min to inactivate the enzyme, cool and add activated carbon for decolorization treatment, and filter to remove the activated carbon; (3) The filtrate is separated by an ultrafiltration membrane with a molecular weight cutoff of 10 kDa. The retentate is collected, freeze-dried, and the freezing temperature is set to -40~-50℃, the vacuum degree is 10-20Pa, the drying time is 24~36 hours, and the aloe vera extract powder is obtained by pulverizing.

[0011] Preferably, the chamomile extract is prepared according to the following steps: (1) Weigh the dried chamomile inflorescence, add 10 to 12 times the amount of purified water, soak for 30 minutes, then heat and reflux to extract twice, each extraction time is 1.5 to 2 hours, and the extraction temperature is maintained at 90 to 95℃; combine the extracts, cool to room temperature, add chitosan clarifying agent for flocculation and clarification, let stand for 4 to 6 hours and then filter. (2) After filtration, the filtrate is purified by passing it through a macroporous adsorption resin (d101 type macroporous adsorption resin) column; first, the impurities are washed away with 2 to 3 column volumes of purified water, and then eluted with 4 to 5 column volumes of 60 to 70 wt% ethanol solution, and the ethanol eluent is collected; after recovering the ethanol, the concentrate is spray-dried, the inlet air temperature is controlled at 160 to 170℃, and the outlet air temperature is controlled at 80 to 90℃, and the chamomile extract is obtained.

[0012] Preferably, the honey extract is prepared according to the following steps: (1) Take natural mature honey, add 3 to 5 times the weight of deionized water to dilute it, stir evenly, and then filter it through a 100-mesh nylon mesh and a 0.45μm microporous membrane to remove beeswax and mechanical impurities. (2) Pass the filtrate through an activated AB-8 macroporous resin column at a flow rate of 1-2 BV / h. After adsorption saturation, wash the sugar with a large amount of deionized water until there is no reducing sugar reaction in the eluent. Then, use a 70-80 wt% ethanol solution at a flow rate of 2-3 BV / h to elute and collect the eluent. Recover the solvent from the eluent under reduced pressure below 50°C. The resulting concentrate is then freeze-dried under vacuum to obtain a honey extract rich in honey flavonoids and polyphenols.

[0013] The preparation method of the above bath salts includes the following steps: S1. The natural sea salt is pulverized and passed through an 80-100 mesh sieve. The plant extract is concentrated at low temperature to a solid content of 30-40 wt% to obtain pretreated natural sea salt and plant extract. S2. Stir and mix the pretreated natural sea salt and the stabilizer, then add the pretreated plant extract and natural moisturizer, stir and mix again, and finally add the natural essential oil and stir and mix evenly to obtain a mixture. S3. The mixture is granulated and then dried to obtain the bath salt.

[0014] Preferably, the diameter of the granules obtained by granulation in step S3 is 2~4mm, to avoid clumping due to excessive fineness or affecting dissolution due to excessive coarseness.

[0015] Preferably, the drying temperature in step S3 is 40~45℃, the drying time is 1~2h, and the moisture content is controlled to be ≤5%.

[0016] Compared with the prior art, the beneficial effects of the present invention include: (1) The bath salt prepared by this invention uses pure natural ingredients, is mild and non-irritating, and is suitable for all skin types, especially sensitive skin.

[0017] (2) The bath salt prepared by this invention has strong cleaning power and can effectively remove dirt and keratin from the skin. At the same time, it moisturizes and soothes, leaving the skin hydrated and not tight after use.

[0018] (3) The bath salt prepared by the present invention has a moderate dissolution rate, uniform particle dispersion, no residue, and a good user experience.

[0019] (4) The bath salt of the present invention has added natural stabilizers during the preparation process, which can extend the shelf life to 24 months. The bath salt is not easy to clump or deteriorate and is easy to store. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] The lavender extract, aloe vera extract, chamomile extract, and honey extract described in the examples were prepared according to the following methods: The lavender extract was prepared according to the following steps: (1) Select dried lavender buds, crush them and pass them through a 40-mesh sieve to obtain coarse lavender powder; (2) Mix the crude lavender powder with a 70wt% ethanol solution at a material-to-liquid ratio of 1:15 g / mL, place it in an ultrasonic extraction vessel, set the ultrasonic power to 300W, the ultrasonic frequency to 40kHz, the extraction temperature to 45℃, the extraction time to 40 minutes, and the extraction to be performed twice; combine the two extracts, centrifuge at 4000r / min for 15 minutes, and take the supernatant. (3) The supernatant was concentrated under reduced pressure at a vacuum of -0.08 MPa (gauge pressure) and a temperature of 50°C to a paste with a relative density of 1.10~1.15 (measured at 50°C), and then dried to obtain lavender extract.

[0022] Preferably, the aloe vera extract is prepared according to the following steps: (1) Take fresh Aloe vera leaves, clean and disinfect them, peel them, take the aloe vera gel pulp, and grind it into aloe vera pulp using a colloid mill; (2) Adjust the pH of aloe vera pulp to 5.0, add 0.1 parts of pectinase and cellulase complex enzyme (mass ratio 1:1) of aloe vera pulp, and enzymatically hydrolyze in a constant temperature water bath at 40℃ for 3 hours; heat to 90℃ and hold for 5 minutes to inactivate the enzyme, cool and add activated carbon for decolorization treatment, and filter to remove activated carbon. (3) The filtrate was separated by an ultrafiltration membrane with a molecular weight cutoff of 10 kDa, the retentate was collected, and the filtrate was freeze-dried. The freezing temperature was set to -40℃, the vacuum degree was 10Pa, the drying time was 24 hours, and the aloe vera extract powder was obtained by pulverizing.

[0023] The chamomile extract was prepared according to the following steps: (1) Weigh the dried chamomile inflorescence, add 10 times the amount of purified water, soak for 30 min, then heat and reflux to extract twice, each extraction time is 1.5 h, and the extraction temperature is maintained at 95℃; combine the extracts, cool to room temperature, add chitosan clarifying agent for flocculation and clarification, let stand for 4 h and then filter; (2) After filtration, the filtrate is purified by passing it through a macroporous adsorption resin (d101 type macroporous adsorption resin) column; first, the impurities are washed away with 2 column volumes of purified water, and then eluted with 5 column volumes of 60wt% ethanol solution. The ethanol eluent is collected; after recovering the ethanol, the concentrate is spray-dried, with the inlet air temperature controlled at 160℃ and the outlet air temperature controlled at 90℃, thus obtaining chamomile extract.

[0024] The honey extract was prepared according to the following steps: (1) Take natural mature honey, add 5 times the weight of deionized water to dilute it, stir evenly, and then filter it through a 100-mesh nylon mesh and a 0.45μm microporous membrane to remove beeswax and mechanical impurities. (2) Pass the filtrate through an activated AB-8 macroporous resin column at a flow rate of 1 BV / h. After adsorption saturation, wash the sugar with a large amount of deionized water until there is no reducing sugar reaction in the eluent. Then, elute with a 70wt% ethanol solution at a flow rate of 2 BV / h and collect the eluent. Recover the solvent from the eluent under reduced pressure below 50°C. The resulting concentrate is freeze-dried under vacuum to obtain a honey extract rich in honey flavonoids and polyphenols.

[0025] Example 1 A bath salt is prepared from the following components in parts by weight: 67 parts natural sea salt, 12 parts plant extracts, 8 parts natural moisturizer, 2 parts natural essential oil (tea tree oil) and 1 part stabilizer (natural vitamin E). The plant extracts include 3 parts lavender extract, 4 parts aloe vera extract and 5 parts chamomile extract; The natural moisturizer comprises 5 parts glycerin and 3 parts honey extract.

[0026] The specific steps for preparing the above bath salts are as follows: S1. The natural sea salt is pulverized and passed through a 90-mesh sieve. The plant extract is concentrated at low temperature (≤40℃) to a solid content of 35wt% to obtain pretreated natural sea salt and plant extract. S2. Stir and mix the pretreated natural sea salt and the stabilizer for 12 minutes, then add the pretreated plant extract and natural moisturizer, stir and mix again for 22 minutes, and finally add the natural essential oil and stir for 6 minutes to mix evenly to obtain the mixture. S3. Feed the mixture into a granulator, control the particle diameter to 3mm, put the particles into a drying oven, dry at 45℃ for 1.5h, control the moisture content to ≤5%, screen qualified particles through an 8-mesh sieve, seal and package under sterile conditions to obtain the bath salt.

[0027] Example 2 A bath salt is prepared from the following components in parts by weight: 75 parts natural sea salt, 8 parts plant extracts, 5 parts natural moisturizer, 1 part natural essential oil (rose essential oil) and 0.5 parts stabilizer (phytosterols, soybean extract). The plant extracts include 2 parts lavender extract, 3 parts aloe vera extract and 3 parts chamomile extract; The natural moisturizer comprises 3 parts glycerin and 2 parts honey extract.

[0028] The preparation method of the above bath salt is as follows: Compared with Example 1, the only difference is that the natural sea salt is passed through an 80-mesh sieve, the particle diameter of the granulation is controlled to be 2 mm, the drying temperature after granulation is 45°C, and the drying time is 2 h. The other steps are the same as in Example 1.

[0029] Example 3 A bath salt is prepared from the following components in parts by weight: 60 parts natural sea salt, 15 parts plant extract, 10 parts natural moisturizer, 3 parts natural essential oil (tea tree oil) and 2 parts stabilizer (natural vitamin E). The plant extracts include 4 parts lavender extract, 5 parts aloe vera extract and 6 parts chamomile extract; The natural moisturizer comprises 6 parts glycerin and 4 parts honey extract.

[0030] The preparation method of the above bath salt is as follows: Compared with Example 1, the only difference is that the natural sea salt is passed through a 100-mesh sieve, the particle diameter of the granulation is controlled to be 4 mm, the drying temperature after granulation is 50°C, and the drying time is 1 h. The other steps are the same as in Example 1.

[0031] Comparative Example 1 (lacking lavender extract) Comparative Example 1 provides a bath salt, wherein, Formula adjustment: Compared with Example 1, the only difference is that the corresponding amount of lavender extract is not included, and the amount of natural sea salt is increased to 70 parts.

[0032] The preparation method of the bath salt described in Comparative Example 1 is the same as that in Example 1.

[0033] Comparative Example 2 (lacking aloe vera extract) Comparative Example 2 provides a bath salt, wherein, Formula adjustment: Compared with Example 1, the only difference is that the corresponding amount of aloe vera extract is not included, and the amount of natural sea salt is increased to 71 parts.

[0034] The preparation method of the bath salt described in Comparative Example 2 is the same as that in Example 1.

[0035] Comparative Example 3 (lacking chamomile extract) Comparative Example 3 provides a bath salt, wherein, Formula adjustment: Compared with Example 1, the only difference is that the corresponding amount of chamomile extract is not included, and the amount of natural sea salt is increased to 72 parts.

[0036] The preparation method of the bath salt described in Comparative Example 3 is the same as that in Example 1.

[0037] Comparative Example 4 (lacking honey extract) Comparative Example 4 provides a bath salt, wherein, Formula adjustment: Compared with Example 1, the only difference is that the corresponding amount of honey extract is not included, and the amount of natural sea salt is increased to 70 parts.

[0038] The preparation method of the bath salt described in Comparative Example 4 is the same as that in Example 1.

[0039] Test section: 1.1 Solubility Test Test objective: To test the dissolution rate and uniformity of bath salts in water.

[0040] Test method: Take 20g of each of the bath salt samples prepared in the examples and comparative examples, and add them to beakers containing 1000mL of distilled water. Keep the water temperature constant at 38℃ (simulating the temperature of human bath water), and start the magnetic stirrer with the speed set to 100r / min.

[0041] Record the time (in seconds) from the time the sample is added until the particles are completely dissolved and invisible to the naked eye.

[0042] After dissolving, let it stand for 5 minutes and observe whether there are any undissolved residues at the bottom of the cup.

[0043] 1.2 Skin moisture content test (moisturizing effect) Test objective: To detect changes in the moisture content of the stratum corneum of the skin after using the bath salts prepared in the examples and comparative examples, and to evaluate their moisturizing and water-locking capabilities.

[0044] Test subjects: 40 healthy female volunteers aged 20-40 with similar skin types were selected and randomly divided into 8 groups of 5 people each.

[0045] Test method: The test environment temperature was 22±2℃ and the relative humidity was 50±5%.

[0046] Before the test, volunteers cleaned the skin on the inside of their forearms, sat quietly for 20 minutes, and used a Corneometer CM825 skin moisture meter to measure the skin's basal moisture value (T0) before the test.

[0047] Each group of bath salts was prepared into a 2% aqueous solution (38℃), and volunteers immersed their forearms in the solution for 15 minutes (simulating a bath).

[0048] After soaking, gently pat dry with a paper towel, sit quietly for 1 hour, and then measure the skin moisture level (T1) after use.

[0049] Calculation formula: Skin moisture enhancement rate = [(T1-T0) / T0]×100% 1.3 Soothing and Repairing Effect Test (Subjective Evaluation + Erythema Value) Test objective: To evaluate the product's soothing and calming effect on sensitive or irritated skin.

[0050] Test subjects: 24 volunteers who reported having sensitive skin and had recently experienced mild skin redness were selected.

[0051] Test method: Volunteers used the bath salts prepared in the examples and comparative examples (prepared as a 2% solution for soaking for 15 minutes) for one week consecutively.

[0052] Objective indicators: The erythema index was measured before and after use using a Mexameter MX18 instrument (German CK MX18 skin melanin and hemoglobin testing probe), and the erythema reduction rate was calculated. The higher the erythema reduction rate, the better the soothing and redness-reducing effect.

[0053] Subjective rating: Volunteers rated the product based on their subjective feelings after use (such as whether it stings, relieves itching, tightness, etc.), with a maximum score of 10 (10 points = very comfortable and non-irritating, 0 points = severe irritation and discomfort).

[0054] 1.4 Moisture-proof and anti-caking stability test Test objective: To verify the stability of the product during storage.

[0055] Test method: Take 50g of each of the bath salts prepared in the examples and comparative examples, place them in open petri dishes, and put them in a constant temperature and humidity chamber (temperature 30℃, relative humidity 80%).

[0056] After 72 hours, observe the condition of the sample.

[0057] Rating criteria: Grade A: Loose granules, no moisture absorption or dampness, no clumping; Grade B: The surface is slightly hygroscopic with a small amount of soft lumps that dissipate easily upon light touch; Grade C: Significantly absorbs moisture and deliquesces, clumps severely, and is difficult to break up.

[0058] The results of the above tests are shown in Table 1.

[0059] Table 1 Test Results

[0060] Note: The commercially available product is a natural ultrafine bath salt purchased from Qiuhui Trading Company in Lanshan District, Linyi City.

[0061] As can be seen from the statistical data in Table 1, Examples 1-3 outperformed the commercially available control group in all indicators. The dissolution time of the product of this invention was controlled between 35 and 48 seconds, much faster than the 65 seconds of the commercially available product, demonstrating the effectiveness of granulation control and microwave drying technology in the production process. Furthermore, the bath salts prepared in the examples all achieved Grade A stability, while the commercially available natural products showed severe clumping (Grade C) after 72 hours in a high-humidity environment. This proves that the natural stabilizers (vitamin E / phytosterols) added in this invention, combined with a specific moisture content control process, significantly improved the shelf-life stability of the product.

[0062] Analysis of soothing and repairing efficacy (verifying the synergistic effect of plant extracts): Example 1 showed a 25.4% reduction in erythema, significantly better than Comparative Example 1 (lavender-deficient, 12.5%) and Comparative Example 3 (chamomile-deficient, 10.8%). This indicates that while single plant extracts have certain efficacy, lavender and chamomile extracts exhibit a significant synergistic effect in this formulation. When used in combination, their calming and redness-reducing effects on sensitive skin show a "1+1>2" trend, meaning neither can be omitted.

[0063] Moisturizing efficacy analysis (verifying the necessity of the moisturizing system): In Example 1, the skin moisture improvement rate reached 58.6%, while in Comparative Example 2 (lacking aloe vera), it decreased to 41.5%, and in Comparative Example 4 (lacking honey extract), it decreased significantly to 32.4%. This indicates that honey extract and aloe vera extract are the core components of the long-lasting moisturizing system of this invention. In particular, honey extract, rich in flavonoids and polyphenols, plays a key role in water retention. If honey extract is removed, the moisturizing effect after product use will be greatly reduced, and the technical problem of "tight skin after washing" cannot be solved.

[0064] The above embodiments merely illustrate implementation methods of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A bath salt, characterized by, Prepared from components including the following quality parts: 60~75 parts of natural sea salt, 8~15 parts of plant extract, 5~10 parts of natural moisturizer, 1~3 parts of natural essential oil and 0.5~2 parts of stabilizer; The plant extract includes 2~4 parts of lavender extract, 3~5 parts of aloe extract and 3~6 parts of chamomile extract; The natural moisturizer includes 3~6 parts of glycerol and 2~4 parts of honey extract.

2. The bath salts according to claim 1, characterized in that, The natural essential oil includes at least one of tea tree essential oil and rose essential oil.

3. The bath salts according to claim 1, characterized in that, The stabilizer is at least one of natural vitamin E and phytosterol.

4. The bath salts of claim 1, wherein, The lavender extract is prepared according to the following steps: (1) Select dried lavender flower buds, crush and pass through a 40~60 mesh sieve to obtain lavender coarse powder; (2) Mix the lavender coarse powder with an ethanol solution with a concentration of 70~80wt% at a solid-liquid ratio of 1:15~25 g / mL, place it in an ultrasonic extraction tank, set the ultrasonic power to 300~500W, the ultrasonic frequency to 40kHz, the extraction temperature to 45~55℃, and the extraction time to 40~60 minutes, and extract for 2 times; centrifuge the combined two extraction liquids at a speed of 4000~5000r / min for 10~15min, and take the supernatant; (3) Concentrate the supernatant under reduced pressure at a vacuum degree of -0.08~ -0.09 MPa and a temperature of 45~50℃ to a relative density of 1.10~1.15, and dry to obtain the lavender extract.

5. The bath salts of claim 1, wherein, The aloe extract is prepared according to the following steps: (1) Take fresh Aloe vera barbadensis Miller leaves, peel them after washing and disinfecting, take the aloe gel meat, and beat it into aloe slurry with a colloid mill; (2) Adjust the pH value of the aloe slurry to 4.0~5.0, add 0.1~0.3 parts of pectinase and cellulase complex enzyme based on the mass of the aloe slurry, and enzymatically hydrolyze in a constant temperature water bath at 40~45℃ for 2~3h; raise the temperature to 90~95℃ and keep for 5~10min to inactivate the enzyme, then cool it down and add activated carbon for decolorization treatment, and filter to remove the activated carbon; (3) Separate the filtrate through an ultrafiltration membrane with a molecular weight cutoff of 10 kDa, collect the retentate, freeze-dry it, set the freezing temperature to -40~ -50℃, the vacuum degree to 10~20Pa, and the drying time to 24~36 hours, and then crush to obtain aloe extract powder.

6. The bath salts of claim 1, wherein, The chamomile extract is prepared according to the following steps: (1) Weigh the dried inflorescences of Matricaria recutita L., add 10~12 times the amount of purified water, soak for 30min, then heat and reflux extract for 2 times, each time for 1.5~2h, and keep the extraction temperature at 90~95℃; combine the extraction liquids, cool to room temperature, add chitosan clarifier for flocculation clarification, stand for 4~6h, and then filter; (2) The filtrate is purified by passing through a macroporous adsorption resin column; first, 2-3 times the column volume of purified water is used to wash away impurities, and then 4-5 times the column volume of an ethanol solution with a concentration of 60-70 wt% is used for elution, and the ethanol eluate is collected; after recovering the ethanol, the concentrated solution is spray dried, with the inlet air temperature controlled at 160-170°C and the outlet air temperature controlled at 80-90°C, to obtain the chamomile extract.

7. The bath salts of claim 1, wherein, The honey extract is prepared according to the following steps: (1) Natural mature honey is diluted by adding 3-5 times the weight of deionized water, and stirred uniformly, and then filtered through a 100-mesh nylon screen and a 0.45-μm microporous filter membrane in sequence to remove beeswax and mechanical impurities; (2) The filtrate is passed through an activated AB-8 macroporous resin column, and the flow rate is controlled at 1-2 BV / h; after adsorption saturation, first, a large amount of deionized water is used to elute the sugar until the eluate has no reducing sugar reaction; then, an ethanol solution with a concentration of 70-80 wt% is used for elution at a flow rate of 2-3 BV / h, and the eluate is collected; the eluate is recovered at a reduced pressure below 50°C, and the obtained concentrated solution is vacuum freeze-dried to obtain a honey extract rich in honey flavones and polyphenols.

8. A process for the preparation of the bath salts according to any one of claims 1 to 7, characterized in that, Comprising the following steps: S1, the natural sea salt is crushed and passed through an 80-100-mesh screen, and the plant extract is concentrated at a low temperature to a solid content of 30-40 wt% to obtain pretreated natural sea salt and plant extract; S2, the pretreated natural sea salt and the stabilizer are stirred and mixed, then the pretreated plant extract and natural humectant are added, stirred and mixed again, and finally the natural essential oil is added and stirred and mixed uniformly to obtain a mixture; S3, the mixture is granulated and dried to obtain the bath salt.

9. The method of claim 8, wherein the bath salts are prepared by, The diameter of the granules obtained by granulation in step S3 is 2-4 mm.

10. The method of claim 8, wherein the bath salts are prepared by, The drying temperature in step S3 is 40-45°C, and the drying time is 1-2 h.

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