Low-water-activity antiseptic-free washing and care particle and preparation method thereof

Abstract

The invention belongs to the technical field of daily chemical products, and particularly relates to a low-water-activity preservative-free washing and care particle and a preparation method thereof. The preparation method comprises the following steps: S1, uniformly mixing other components except the thickening agent, drying, and crushing into powder; s2, a thickening agent and water are mixed to prepare a thickening agent aqueous solution, then the powder in the step S1 is added into a granulator, then the thickening agent aqueous solution is sprayed into the granulator, the air temperature in the granulator is controlled through an air blower, particles are prepared, and the washing and caring particles are obtained. The mass concentration of the thickening agent aqueous solution is 0.3-0.7%; the temperature of air in the granulator is controlled to be 80-90 DEG C. By accurately controlling various important factor parameters in the process, an ideal particle structure and uniform particle size distribution can be ensured, and meanwhile, the water activity of the particles is remarkably reduced, so that the quality, the stability and the overall cleaning and protecting performance of the preservative-free particles are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of daily chemical products, and in particular relates to low-water-activity non-preservative cleaning particles and a preparation method thereof. Background Art

[0002] At present, some chemical ingredients, especially preservatives, in traditional liquid cleaning products, including shampoo and shower gel, may irritate the skin and cause allergic reactions, which in turn affect the comfort and health of users. In addition, the production and packaging process of liquid cleaning products usually requires a large amount of water resources, which not only increases production costs but also puts a burden on the environment. Especially today when global water resources are becoming increasingly scarce, how to reduce water consumption in the production process has become a difficult problem that needs to be solved urgently in the cleaning products industry.

[0003] Therefore, developing a specific process method for preparing solid cleaning and care granules without preservatives has become an important direction of market demand in response to the problems existing in the prior art. Solid cleaning and care granules can not only reduce the use of chemical ingredients and avoid allergies and irritation problems, but also reduce water consumption in production and transportation through streamlined formulas and convenient packaging. Moreover, this granular cleaning and care product only needs to be dissolved in water when used, which reduces the dependence of traditional liquid cleaning and care products on water resources, and makes it easier to accurately control the dosage and avoid waste. At the same time, the unique shape of the particles also helps to extend the shelf life of the product, reduce the need for preservatives, and further improve the safety and environmental protection of the product. Summary of the invention

[0004] The object of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a low water activity non-preservative cleaning particle and a preparation method thereof.

[0005] To achieve the above objectives, the technical solutions adopted by the present invention include:

[0006] In a first aspect, the present invention provides a method for preparing low water activity non-preservative cleaning particles, the preparation method comprising the following steps:

[0007] S1. Take the following raw materials in parts by weight respectively: 22-61 parts of surfactant, 10-15 parts of filler, 1-5 parts of anti-caking agent, 2.1-21 parts of moisturizer, 0.1-1 parts of pH adjuster and 0.5-1.5 parts of fragrance, mix the weighed raw materials evenly, dry them and grind them into powder;

[0008] S2, weighing a thickener, and mixing the thickener with water to prepare a thickener aqueous solution;

[0009] S3, adding the powder described in step S1 into a granulator, and then spraying the thickener aqueous solution described in step S2 into the granulator, controlling the air temperature in the granulator to be 80-90° C., and producing granules, that is, obtaining the washing and conditioning granules;

[0010] The mass concentration of the thickener in the thickener aqueous solution is 0.3-0.7%.

[0011] The present invention adopts the above-mentioned specific process method to prepare solid cleaning particles of the selected components. By spraying the thickener aqueous solution onto the surface of the mixed component powder to form solid particles, the adhesion and uniformity between the components can be effectively improved, and a thin film can be formed on the surface of the particles, which can wrap the particles to a certain extent, so as to prevent water from penetrating too quickly and reduce the diffusion of water, thereby effectively reducing the water activity of the cleaning particles.

[0012] And through experimental research, it was found that the concentration of the thickener aqueous solution in the preparation process and the air temperature during granulation have an important influence on the forming and water activity of the final washing and care particles. When the concentration of the thickener aqueous solution is too low, the binding force between the components will be weak, resulting in loose particles during the granulation process, resulting in uneven or loose and fragile particles. When the concentration of the thickener aqueous solution is too high, the viscosity of the aqueous solution is large, which will lead to reduced fluidity of the particles and affect the uniformity and dispersibility of the particles; when the air temperature is too low during granulation, it will make it difficult for the particles to dry completely, resulting in poor hardness, easy moisture absorption, and high water activity. When the temperature is too high, the surface of the particles will harden and the internal water content will be too much, thus affecting the uniformity and forming of the particles. In addition, high temperature may also affect the performance of the thickener, leading to degradation or performance changes of the thickener, thereby affecting the structure and stability of the particles.

[0013] Therefore, the present invention adopts the above-mentioned specific process method to prepare the cleaning and care particles, and through the combined effect of the preferred thickener concentration and granulation temperature, effectively avoid the disintegration or non-forming of the particles, ensure the uniformity of the size of the particles, and significantly reduce the water activity of the particles, thereby ensuring the quality and stability of the preservative-free particles.

[0014] Preferably, in step S2, the mass ratio of the thickener aqueous solution to the powder is (0.2-0.4):1.

[0015] Preferably, the mass ratio of the thickener aqueous solution to the powder is 0.3:1.

[0016] In the preparation process of cleaning and care granules, the mass ratio of thickener aqueous solution to powder is also an important factor in controlling the quality and performance of the granules. When the two are prepared in the above-mentioned optimal mass ratio, it can ensure the formation of an ideal granule structure between the components and a uniform particle size distribution, and effectively improve the mechanical strength of the granules, reducing the risk of breakage and fragmentation of the granules during storage or transportation. In addition, it can also ensure the solubility of the granules and the hydration during use to a certain extent, thereby ensuring a good sensory experience for users.

[0017] Preferably, in step S2, a blower is used to control the air temperature in the granulator, and the speed of the blower is controlled to be 15-50 Hz; and / or the air outlet temperature of the granulator is controlled to be below 50° C., and the humidity is controlled to be 20-40%.

[0018] Through experimental research, it was found that the blowing rate of the blower during granulation and humidity control have an important influence on the morphology, structure and product stability of the particles. If the parameter conditions exceed the above preferred range, it will affect the uniformity and integrity of the particles, causing the particles to stick to each other or form small particle agglomerates. Especially when the humidity is too low, the particles will be easily broken or unable to form the expected particle shape, while too high humidity may cause the particles to easily agglomerate, thereby affecting the morphology and fluidity of the particles. Therefore, when preparing the washing and care particles, accurately controlling the parameter range of each factor can effectively ensure the quality, stability and final use effect of the particles.

[0019] More preferably, the air temperature in the granulator is controlled at 85°C; the air outlet temperature of the granulator is controlled at 30°C, and the humidity is controlled at 30%.

[0020] Preferably, the mass concentration of the thickener in the thickener aqueous solution is 0.5%.

[0021] Preferably, after the particles are manufactured, 10-100 mesh particles are screened to obtain the cleaning particles.

[0022] Preferably, the raw materials for preparing the preservative-free cleaning and care particles include the following components in parts by weight: 45 parts of surfactant, 12 parts of filler, 3 parts of anti-caking agent, 15 parts of moisturizer, 0.5 parts of pH adjuster and 1 part of fragrance.

[0023] Through experimental research, it was found that under the same preparation process conditions, when the components are used in the above-mentioned optimal dosage ratio to prepare the cleaning and care particles, the components cooperate with each other to minimize the water activity of the cleaning and care particles and improve the performance of the particles, and the long-term stability of the particles can be effectively guaranteed without adding preservatives.

[0024] Preferably, the thickener comprises hydroxypropyl methylcellulose, xanthan gum and chitosan, and the mass ratio of hydroxypropyl methylcellulose, xanthan gum and chitosan is (0.1-1): (0.1-0.5): (0.1-0.3).

[0025] Preferably, the mass ratio of hydroxypropyl methylcellulose, xanthan gum and chitosan is 0.5:0.3:0.2.

[0026] When preparing the cleaning and care particles, the inventors also explored the selection of thickeners. Through experiments, it was found that when hydroxypropyl methylcellulose, xanthan gum and chitosan are compounded within the above-mentioned preferred range as thickeners for preparing the cleaning and care particles, the interaction between the three can effectively avoid the problem of slow or uneven dissolution of the cleaning and care particles due to a single thickener, and improve the structure and performance of the particles by adjusting the viscosity, thereby significantly improving the stability of the particles. In addition, the antibacterial properties of chitosan can complement the properties of the other two thickeners, thereby helping the cleaning and care particles to increase a certain degree of antibacterial protection in the absence of preservatives, further enhancing the long-term stability of the particles.

[0027] Preferably, the surfactant comprises cetyl trimethyl ammonium chloride, cocamidopropyl betaine, sodium lauryl sulfate and sodium cocoyl isethionate; the mass ratio of cetyl trimethyl ammonium chloride, cocamidopropyl betaine, sodium lauryl sulfate and sodium cocoyl isethionate is (5-20):(5-15):(10-20):(2-6).

[0028] Preferably, the mass ratio of cetyltrimethylammonium chloride, cocamidopropyl betaine, sodium lauryl sulfate and sodium cocoyl isethionate is 15:10:15:5.

[0029] The present invention selects the above four surfactants to be compounded within a specific dosage ratio range, and the components complement each other, so that the cleaning particles can not only effectively clean the hair and scalp, but also avoid the irritation and dryness that may be caused by a single surfactant, thereby achieving a gentle and deep cleaning effect. In addition, the compounding of the four components can synergistically improve the richness, stability and fineness of the foam, and maintain a good rinsing effect of the cleaning particles after use, avoiding incomplete rinsing, thereby providing users with a better use experience.

[0030] Preferably, the filler comprises at least one of modified corn starch, microcrystalline cellulose and polyvinyl alcohol; and / or the anti-caking agent comprises magnesium stearate or silicon dioxide; and / or the humectant comprises at least one of sodium hyaluronate, trehalose and sorbitol; and / or the pH adjuster comprises citric acid; and / or the fragrance comprises essence.

[0031] In a second aspect, the present invention provides an application of the preparation method in the preparation of washing and care products, wherein the washing and care products include shampoo products, bath products and face wash products.

[0032] The preparation method of the present invention can be widely used in the preparation of personal care solid particle products such as shampoo, face wash or bath. The method can reduce the water activity of the washing and care particles to the greatest extent and improve the performance of the particles. The long-term stability of the particles can be effectively guaranteed without adding preservatives, and the irritation and allergic reaction of the preservative ingredients to the skin can be effectively avoided. The method is suitable for people with all skin types, especially those with sensitive skin.

[0033] In a third aspect, the present invention provides a low water activity preservative-free washing and conditioning particle, the washing and conditioning particle comprises the washing and conditioning particle prepared by the above preparation method, and a hair conditioner and a softener.

[0034] Preferably, the softener comprises at least one of argania spinosa kernel oil, jojoba seed oil and coconut oil; and the hair conditioning agent comprises lactobacillus / rye flour fermentation product.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) The present invention adopts a specific preparation process to innovatively develop a solid cleaning particle, and by accurately controlling the parameters of various important factors in the process, it can ensure the formation of an ideal particle structure and uniform particle size distribution, and effectively improve the mechanical strength of the particles, reduce the risk of easy breakage and fragmentation of the particles during storage or transportation, and significantly reduce the water activity of the particles, thereby ensuring the quality, stability and overall performance of the preservative-free particles. The particles are easy to rinse and have no residue, which can significantly reduce the water consumption during use and reduce the consumption of water resources. The volume is also greatly reduced, and it is easy to transport or carry;

[0037] (2) The present invention combines the selected specific surface active agents and thickeners with other ingredients to prepare the cleaning particles. The components cooperate with each other to effectively achieve the mild and deep cleaning effect of the cleaning particles, and synergistically improve the richness, stability and fineness of the foam, while improving the structure and performance of the particles to further enhance the long-term stability of the particles and maintain a good rinsing effect of the cleaning particles after use, thereby effectively improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The following are appearance pictures of the cleaning and conditioning particles prepared in Example 1 (A) and Comparative Example 1 (B). DETAILED DESCRIPTION

[0039] To better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be understood by those skilled in the art that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] Unless otherwise specified, all raw materials involved in the following examples and comparative examples are commercially available general materials. Experimental operations not specifically specified are all routine operations in the art or can be understood or known by those skilled in the art based on the existing technology or common knowledge they master.

[0041] Example 1

[0042] This embodiment 1 provides a method for preparing low water activity non-preservative cleaning particles, the preparation method comprising the following steps:

[0043] S1. Take the following raw materials in parts by weight respectively: 15 parts of cetyltrimethylammonium chloride, 10 parts of cocamidopropyl betaine, 15 parts of sodium lauryl sulfate, 5 parts of sodium cocoyl isethionate, 12 parts of modified corn starch, 3 parts of magnesium stearate, 1 part of sodium hyaluronate, 9 parts of trehalose, 5 parts of sorbitol, 0.001 parts of lactobacillus / rye powder fermentation product, 0.001 parts of argania spinosa kernel oil, 0.001 parts of jojoba seed oil, 0.001 parts of coconut oil, 0.5 parts of citric acid and 1 part of daily flavor, mix the weighed raw materials evenly, dry them, and grind them into powder;

[0044] S2, weighing hydroxypropyl methylcellulose, xanthan gum and chitosan, mixing the raw materials with water to prepare a thickener aqueous solution with a mass concentration of 0.5%, wherein the mass ratio of hydroxypropyl methylcellulose, xanthan gum and chitosan is 0.5:0.3:0.2;

[0045] S3, adding the powder described in step S1 into a granulator, spraying the thickener aqueous solution described in step S2 into the granulator, and then using a peristaltic pump to evenly spray the thickener aqueous solution into the granulator, controlling the air temperature blown into the granulator by a blower at 85°C, and the blower speed at 15HZ, so that the powder is turned in the granulator and can fully contact the sprayed aqueous solution to produce granules, and the granulator outlet air temperature is controlled at 30°C, and the humidity is controlled at 30%;

[0046] S4, screening (10-100) purpose particles as cleaning particles for filling finished products;

[0047] In the step S3, the mass ratio of the thickener aqueous solution to the powder is 0.3:1.

[0048] Example 2

[0049] This embodiment provides a method for preparing low water activity non-preservative cleaning particles. The raw materials for preparing the cleaning particles are the same as those in Example 1. The preparation method comprises the following steps:

[0050] S1. Weigh the same raw materials and amounts as in Example 1 except for the thickener, mix the weighed raw materials evenly, dry them, and grind them into powder;

[0051] S2, weighing a thickener raw material, and mixing the raw material with water to prepare a thickener aqueous solution with a mass concentration of 0.7%, wherein the mass ratio of hydroxypropyl methylcellulose, xanthan gum and chitosan in the thickener is 1:0.1:0.1;

[0052] S3, adding the powder described in step S1 into the granulator, spraying the thickener aqueous solution described in step S2 into the granulator, and then using a peristaltic pump to evenly spray the thickener aqueous solution into the granulator, controlling the air temperature blown into the granulator by the blower at 80°C, and the fan speed at 50HZ, so that the powder is turned in the granulator and can fully contact the sprayed aqueous solution to produce granules, and the granulator outlet air temperature is controlled below 50°C, and the humidity is controlled at 20%;

[0053] S4, screening (10-100) purpose particles as cleaning particles for filling finished products;

[0054] In the step S3, the mass ratio of the thickener aqueous solution to the powder is 0.2:1.

[0055] Example 3

[0056] This embodiment provides a method for preparing low water activity non-preservative cleaning particles. The raw materials for preparing the cleaning particles are the same as those in Example 1. The preparation method comprises the following steps:

[0057] S1. Weigh the same raw materials and amounts as in Example 1 except for the thickener, mix the weighed raw materials evenly, dry them, and grind them into powder;

[0058] S2, weighing a thickener raw material, and mixing the raw material with water to prepare a thickener aqueous solution with a mass concentration of 0.3%, wherein the mass ratio of hydroxypropyl methylcellulose, xanthan gum and chitosan in the thickener is 0.1:0.5:0.3;

[0059] S3, adding the powder described in step S1 into the granulator, spraying the thickener aqueous solution described in step S2 into the granulator, and then using a peristaltic pump to evenly spray the thickener aqueous solution into the granulator, controlling the air temperature blown into the granulator by the blower at 90°C, and the fan speed at 50HZ, so that the powder is turned in the granulator and can fully contact the sprayed aqueous solution to produce granules, and the granulator outlet air temperature is controlled below 50°C, and the humidity is controlled at 40%;

[0060] S4, screening (10-100) purpose particles as cleaning particles for filling finished products;

[0061] In the step S3, the mass ratio of the thickener aqueous solution to the powder is 0.4:1.

[0062] Example 4

[0063] This embodiment 1 provides a method for preparing low water activity preservative-free washing and care particles, which differs from embodiment 1 only in that the raw materials are different. The raw materials for preparing the washing and care particles in this embodiment include the following components in parts by weight: 5 parts of hexadecyl trimethyl ammonium chloride, 5 parts of cocamidopropyl betaine, 10 parts of sodium lauryl sulfate, 2 parts of sodium cocoyl isethionate, 10 parts of modified corn starch, 1 part of magnesium stearate, 0.1 parts of sodium hyaluronate, 1 part of trehalose, 1 part of sorbitol, 0.0005 parts of lactobacillus / rye powder fermentation product, 0.0005 parts of spiny argan kernel oil, 0.0005 parts of jojoba seed oil, 0.0005 parts of coconut oil, 0.1 parts of citric acid and 0.5 parts of daily flavor. The thickener component and dosage and preparation process conditions are the same as those in embodiment 1.

[0064] Example 5

[0065] This embodiment 1 provides a method for preparing low water activity preservative-free washing and care particles, which differs from embodiment 1 only in that the raw materials are different. The raw materials for preparing the washing and care particles in this embodiment include the following components in parts by weight: 20 parts of hexadecyl trimethyl ammonium chloride, 15 parts of cocamidopropyl betaine, 20 parts of sodium lauryl sulfate, 6 parts of sodium cocoyl isethionate, 15 parts of modified corn starch, 5 parts of magnesium stearate, 1 part of sodium hyaluronate, 10 parts of trehalose, 10 parts of sorbitol, 0.0015 parts of lactobacillus / rye powder fermentation product, 0.0015 parts of spinosa kernel oil, 0.0015 parts of jojoba seed oil, 0.0015 parts of coconut oil, 1 part of citric acid and 1.5 parts of daily flavor. The thickener component and dosage and preparation process conditions are the same as those in embodiment 1.

[0066] Comparative Example 1

[0067] This comparative example provides a method for preparing low-water-activity, preservative-free cleaning and care particles, which differs from Example 1 only in that the mass concentration of the thickener in the thickener aqueous solution is 0.1%, and the mass ratio of hydroxypropyl methylcellulose, xanthan gum and chitosan in the thickener is 0.5:0.3:0.2; the remaining preparation raw materials, amounts and preparation process conditions are the same as those in Example 1.

[0068] Comparative Example 2

[0069] This comparative example provides a method for preparing low-water-activity, preservative-free cleaning and care particles, which differs from Example 1 only in that the mass concentration of the thickener in the thickener aqueous solution is 1%, and the mass ratio of hydroxypropyl methylcellulose, xanthan gum and chitosan in the thickener is 0.5:0.3:0.2; the remaining preparation raw materials, amounts and preparation process conditions are the same as those in Example 1.

[0070] Comparative Example 3

[0071] This comparative example provides a method for preparing low-water-activity, preservative-free cleaning and protection granules, which differs from Example 1 only in that: in step S3, the air temperature in the granulator is controlled to 70°C; the preparation raw materials, dosage and other preparation process conditions are the same as those in Example 1.

[0072] Comparative Example 4

[0073] This comparative example provides a method for preparing low-water-activity, preservative-free cleaning and protection granules, which differs from Example 1 only in that: in step S3, the air temperature in the granulator is controlled to 100°C; the preparation raw materials, dosage and other preparation process conditions are the same as those in Example 1.

[0074] Comparative Example 5

[0075] This comparative example provides a method for preparing low-water-activity preservative-free cleaning and care particles, which differs from Example 1 only in that the mass ratio of the thickener aqueous solution to the powder is 0.1:1, the speed of the blower is controlled at 5 Hz, and the rest is the same as Example 1.

[0076] Comparative Example 6

[0077] This comparative example provides a method for preparing low-water-activity preservative-free cleaning and care particles, which differs from Example 1 only in that the mass ratio of the thickener aqueous solution to the powder is 0.6:1, the speed of the blower is controlled at 60 Hz, and the rest is the same as Example 1.

[0078] Comparative Example 7

[0079] This comparative example provides a method for preparing low-water-activity preservative-free cleaning and protection granules, which differs from Example 1 only in that: in step S3, the air outlet temperature of the granulator is controlled at 60°C and the humidity is controlled at 50%, and the rest is the same as Example 1.

[0080] Comparative Example 8

[0081] This comparative example provides a method for preparing low-water-activity, preservative-free cleaning and protection granules, which differs from Example 1 in that: the thickener is directly mixed with the remaining raw materials, dried, and crushed into powder, and then the powder is added to a granulator, and then a peristaltic pump is used to evenly spray deionized water into the granulator for granulation, and the mass ratio of the deionized water to the powder is 0.3:1; the preparation raw materials, dosage and other preparation process conditions are the same as those in Example 1.

[0082] Comparative Example 9

[0083] This comparative example provides a method for preparing low-water-activity, preservative-free cleaning and care granules, which differs from Example 1 in that: a water-soluble polysaccharide - trehalose is used to replace the thickener and mixed with water to prepare a trehalose aqueous solution with a mass concentration of 0.5%, and then the trehalose aqueous solution is sprayed and granulated; the remaining preparation raw materials, amounts and other preparation process conditions are the same as those in Example 1.

[0084] Comparative Example 10

[0085] This comparative example provides a method for preparing low-water-activity, preservative-free cleaning and care granules, which differs from Example 1 in that: the raw materials are different, xanthan gum and chitosan are missing in this comparative example, and the thickener is only hydroxypropyl methylcellulose; the remaining preparation raw materials, amounts and preparation process conditions are the same as those in Example 1.

[0086] Comparative Example 11

[0087] This comparative example provides a method for preparing low-water-activity, preservative-free cleaning and care granules, which differs from Example 1 in that: the raw materials are different, hydroxypropyl methylcellulose and chitosan are missing in this comparative example, and the thickener is only xanthan gum; the remaining preparation raw materials, amounts and preparation process conditions are the same as those in Example 1.

[0088] Comparative Example 12

[0089] This comparative example provides a method for preparing low-water-activity, preservative-free cleaning and care particles, which differs from Example 1 in that: the raw materials are different, cetyltrimethylammonium chloride and sodium cocoyl isethionate are missing in this comparative example, and the amount of surfactant remains unchanged, that is, the weight of cocamidopropyl betaine is increased to 20 parts, and the weight of sodium lauryl sulfate is increased to 25 parts; the remaining preparation raw materials, amounts and preparation process conditions are the same as those in Example 1.

[0090] Comparative Example 13

[0091] This comparative example provides a method for preparing low-water-activity, preservative-free cleaning and care particles, which differs from Example 1 in that: the raw materials are different, cocamidopropyl betaine and sodium lauryl sulfate are missing in this comparative example, and the amount of surfactant remains unchanged, that is, the weight of hexadecyltrimethylammonium chloride is increased to 30 parts, and the weight of sodium cocoyl isethionate is increased to 15 parts; the remaining preparation raw materials, amounts and preparation process conditions are the same as those in Example 1.

[0092] Effect example

[0093] 1. Particle appearance, particle hardness and dissolution rate test:

[0094] The washing and care particles prepared in Examples 1-5 and Comparative Examples 1-13 were used as samples for appearance observation, particle hardness and dissolution rate testing. The specific method of the dissolution rate test is as follows: 2g of the same mass of particle samples are weighed and placed in 100mL of deionized water of the same volume, and stirred continuously by a stirrer, and the stirrer speed is controlled to 50r / min. The time when the sample is completely dissolved in water is measured to evaluate its dissolution rate. The hardness of the washing and care particles is tested using a hardness meter, and the hardness value (P value) is recorded in N. The specific determination method is shown in the 2005 edition of the Chinese Pharmacopoeia. The specific results are shown in Table 3.

[0095] Table 3

[0096]

[0097]

[0098]

[0099] It can be seen from the results in Table 3 that the washing and care particles prepared by the technical solution of the present invention are uniform in size and relatively high in hardness, which can effectively avoid the problem of particle breakage during transportation or storage, and the washing and care particles have good solubility and can be quickly dissolved during use. In particular, the washing and care particles prepared in Example 1 are the best in terms of hardness and solubility. However, in Comparative Examples 1-9, since the preparation process parameters exceed the specified range of the present invention, the size of the washing and care particles obtained is uneven, and there is adhesion between the particles, which is not conducive to actual production and application. In addition, compared with the examples, the hardness of the particles is significantly reduced, the particle structure is looser, and the solubility is not improved. In Comparative Examples 10-11, due to the lack of any two components of hydroxypropyl methylcellulose, xanthan gum and chitosan, the particle structure cannot be effectively improved, resulting in a certain degree of decrease in particle hardness and a significant deterioration in solubility.

[0100] Figure 1(AB) are the appearance pictures of the washing and conditioning particles prepared in Example 1 and Comparative Example 1, respectively. It can be seen from the figures that the washing and conditioning particles prepared in Example 1 of the present invention have uniform size, complete structure and high hardness, while the washing and conditioning particles prepared in Comparative Example 1 have uneven particle distribution, different particle sizes, and a relatively loose and fragile structure, which is not conducive to the storage and transportation of the washing and conditioning particles.

[0101] 2. Water activity test:

[0102] The cleaning particles prepared in Example 1 and Comparative Examples 1-13 were used as samples, and their water activity was tested. The specific test method was based on the United States Pharmacopoeia-National Formulary General Chapter 922 Water Activity, and a water activity meter was used for testing. The specific results are shown in Table 4.

[0103] Table 4

[0104] Sample source water activity Sample source water activity Sample source water activity Example 1 0.29 Comparative Example 5 0.74 Comparative Example 10 0.56 Comparative Example 1 0.76 Comparative Example 6 0.68 Comparative Example 11 0.58 Comparative Example 2 0.65 Comparative Example 7 0.76 Comparative Example 12 0.59 Comparative Example 3 0.85 Comparative Example 8 0.82 Comparative Example 13 0.61 Comparative Example 4 0.73 Comparative Example 9 0.71

[0105] Water activity has an important influence on the properties, stability and use effects of the product. Generally speaking, solid cleaning particles with lower water activity are more helpful in improving the stability of the product and avoiding the degradation or failure of the active ingredients. Low water activity is also more helpful in controlling the generation of foam and achieving a more stable foam volume and quality, making the solid cleaning particles more uniform and easy to clean without residue when used.

[0106] From the results in Table 4, it can be seen that the washing and conditioning particles prepared by the technical solution of the present invention can achieve a relatively low water activity, especially the water activity of the washing and conditioning particles prepared in Example 1 reaches 0.29, which can fully guarantee the stability and overall performance of the washing and conditioning particles, and can achieve the antiseptic effect without adding preservatives. In Comparative Examples 1-7, when the preparation process conditions of the washing and conditioning particles exceed the preferred range of the present invention, the water activity increases more significantly; in Comparative Example 8, the thickener is directly mixed with the remaining raw materials, and in Comparative Example 9, trehalose with the same adhesiveness is used instead of the thickener of the present invention for granulation, and the water activity of the washing and conditioning particles finally prepared is significantly increased; when the specific surfactant component described in Comparative Examples 12-13 is missing or the component is replaced, the water activity of the prepared washing and conditioning particles increases to a certain extent compared with the examples.

[0107] 3. Product performance evaluation test:

[0108] The cleaning and conditioning particles prepared in Examples 1-5 and Comparative Examples 12-13 were used as samples and subjected to sensory evaluation tests.

[0109] 70 subjects aged between 20 and 60 years old and with no skin abnormalities were randomly selected, including 10 males and 60 females. The subjects were randomly divided into 7 groups, 10 in each group, and the solid washing and care particles of Examples 1-5 and Comparative Examples 12-13 were tried respectively, and the samples were evaluated for shampooing experience. Each sample was tried for 2 weeks, and the subjects evaluated the samples using a scoring system based on their feelings. The evaluation items involved hair cleaning and decontamination, foam richness, and easy flushing without residue. The scoring standard uses a 10-point system, with 1 point being the worst and 10 points being the best. The evaluation results are the average scores of all subjects in each group as shown in Table 5. The higher the average score, the better the effect.

[0110] Table 5

[0111]

[0112] It can be seen from the results in Table 5 that the cleaning particles prepared by the technical solution of the present invention achieve a balance in the cleaning ability, foam stability, easy rinsing and other aspects of the composition during actual application, and can provide users with a more ideal use experience.

[0113] Finally, it should be noted that the above embodiments are intended to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A method for preparing low water activity non-preservative cleaning particles, characterized in that: The preparation method comprises the following steps: S1. Take the following raw materials in parts by weight respectively: 22-61 parts of surfactant, 10-15 parts of filler, 1-5 parts of anti-caking agent, 2.1-21 parts of moisturizer, 0.1-1 parts of pH adjuster and 0.5-1.5 parts of fragrance, mix the weighed raw materials evenly, dry them and grind them into powder; S2, weighing a thickener, and mixing the thickener with water to prepare a thickener aqueous solution; S3, adding the powder described in step S1 into a granulator, and then spraying the thickener aqueous solution described in step S2 into the granulator, controlling the air temperature in the granulator to be 80-90° C., and producing granules, that is, obtaining the washing and conditioning granules; The mass concentration of the thickener in the thickener aqueous solution is 0.3-0.7%.

2. The preparation method according to claim 1, characterized in that In the step S2, the mass ratio of the thickener aqueous solution to the powder is (0.2-0.4):

1.

3. The preparation method according to claim 2, characterized in that: The mass ratio of the thickener aqueous solution to the powder is 0.3:

1.

4. The preparation method according to claim 1, characterized in that: In step S2, a blower is used to control the air temperature in the granulator, and the speed of the blower is controlled to be 15-50 Hz; And / or, the air outlet temperature of the granulator is controlled below 50° C., and the humidity is controlled at 20-40%.

5. The preparation method according to claim 1, characterized in that: The mass concentration of the thickener in the thickener aqueous solution is 0.5%.

6. The preparation method according to claim 1, characterized in that: The raw materials for preparing the non-preservative cleaning and care particles include the following components in parts by weight: 45 parts of surfactant, 12 parts of filler, 3 parts of anti-caking agent, 15 parts of moisturizer, 0.5 parts of pH adjuster and 1 part of fragrance.

7. The preparation method according to claim 1, characterized in that: The thickener comprises hydroxypropyl methylcellulose, xanthan gum and chitosan, and the mass ratio of the hydroxypropyl methylcellulose, xanthan gum and chitosan is (0.1-1): (0.1-0.5): (0.1-0.3).

8. The preparation method according to claim 7, characterized in that: The mass ratio of the hydroxypropyl methylcellulose, xanthan gum and chitosan is 0.5:0.3:0.

2.

9. The preparation method according to claim 1 or 6, characterized in that: The surfactant includes hexadecyltrimethylammonium chloride, cocamidopropyl betaine, sodium lauryl sulfate and sodium cocoyl isethionate; the mass ratio of the hexadecyltrimethylammonium chloride, cocamidopropyl betaine, sodium lauryl sulfate and sodium cocoyl isethionate is (5-20): (5-15): (10-20): (2-6).

10. The preparation method according to claim 1 or 6, characterized in that: The filler includes at least one of modified corn starch, microcrystalline cellulose and polyvinyl alcohol; and / or the anti-caking agent includes magnesium stearate or silicon dioxide; and / or the moisturizer includes at least one of sodium hyaluronate, trehalose and sorbitol; and / or the pH adjuster includes citric acid; and / or the fragrance includes essence.

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