A suspension-stabilizing composition with a wide temperature range and its application in a surfactant system

Abstract

The present invention relates to the field of daily chemicals and discloses a suspension-stabilizing composition with a wide temperature range and its use in a surfactant system. The surfactant system comprises: 0.01-5% bacterial cellulose, 0.1-10% acrylic acid (ester) copolymer, 5-30% surfactant, 0-2% pH adjuster, 0-3% salt, and the balance water. The suspension-stabilizing composition of the present invention contains a specific ratio of bacterial cellulose and acrylic acid (ester) copolymer, which can improve the product's suspension stability at high temperatures (≥50°C) and low temperatures (≤-10°C) without affecting the viscosity of the system.

Description

Technical Field

[0001] The present invention relates to the field of daily chemicals, and in particular to a suspension-stable composition with a wide temperature range and application thereof in a surfactant system. Background Art

[0002] With the advancement of the consumer era, cleaning products have long become a necessity in daily life. In addition to the product's performance, consumers also have higher requirements for the product's appearance. Some cleaning products often contain solid particles of various shapes to achieve a high-quality appearance and functional effects, thereby stimulating consumers' purchasing desire.

[0003] Due to the density difference between these solid particles and the material body, these particles are prone to sedimentation or floating in the system, making the system unstable and affecting the appearance of the sample. In order to improve the stability of these particles in the system, some suspension stabilizers need to be added to maintain the stability of the overall formula. At present, the mainstream suspension products on the market usually use acrylic acid (ester) copolymers as the suspension system, but this type of suspension agent has certain limitations. When the amount of suspension agent added is too small, the suspension performance at higher temperatures (≥50°C) is significantly reduced, causing the particulate matter in the system to settle or float. However, a higher amount of acrylic acid (ester) copolymers will not only make the product difficult to pour due to its high viscosity, but will also have a greater impact on the conditioning effect of the product.

[0004] Cellulose is the most abundant natural polymer material on Earth and can be divided into plant cellulose and bacterial cellulose. Although the two have the same chemical composition, their physical and chemical properties are quite different. Compared with plant cellulose, bacterial cellulose has higher purity and better performance, such as higher Young's modulus, good water retention and excellent biocompatibility. Bacterial cellulose is obtained from sugar substances through fermentation by microorganisms such as Gluconacetobacter xylinus, Agrobacterium, and Rhizobium. It is a microbial extracellular polysaccharide with extremely high purity. Its molecular structure is shown below. It can be widely used in chemical industry, medicine, food, textile and other fields.

[0005] In recent years, bacterial cellulose has been widely used in cosmetics due to its biodegradability, good gas permeability, and high moisturizing properties. For example, patent CN114028311A discloses a hydrogel facial mask based on bacterial cellulose, which has a moisturizing effect. Amnuaikit et al. (Effects of a cellulose mask synthesized by a bacterium on facial skin characteristics and user satisfaction) prepared a facial mask using bacterial cellulose and found that the bacterial cellulose mask significantly increased skin moisture content without any adverse effects on the skin.

[0006] In the applicant's preliminary experiments, bacterial cellulose was used as a suspending agent in cosmetics. The bacterial cellulose formed a nanoscale spatial network structure, stably suspending particulate matter without changing the viscosity of the system. It maintained excellent suspension properties even at higher temperatures (≥50°C). However, we discovered that bacterial cellulose has certain drawbacks in suspension applications: its suspension ability decreases after being stored at lower temperatures (≤-10°C) for a period of time.

[0007] Therefore, how to improve the suspension stability of surfactant products at high and low temperatures without changing the viscosity of the system is a problem that needs to be further solved. Summary of the Invention

[0008] To address the above technical problems, the present invention provides a suspension-stabilizing composition with a wide temperature range and its use in surfactant systems. The suspension-stabilizing composition of the present invention contains a specific ratio of bacterial cellulose and an acrylic acid (ester) copolymer, which improves the product's suspension stability at both high temperatures (≥50°C) and low temperatures (≤-10°C) without affecting the system's viscosity. Furthermore, the suspension-stabilizing composition of the present invention is compatible with different types of surfactant systems, offering broad applicability and high practicality.

[0009] The specific technical solutions of the present invention are:

[0010] In a first aspect, the present invention provides a suspension stabilizing composition with a wide temperature range for use in a surfactant system, comprising the following components in weight percentage: 0.01-5% bacterial cellulose, 0.1-10% acrylic acid (ester) copolymer, 5-30% surfactant, 0-2% pH regulator, 0-3% salt, and the balance water.

[0011] In the suspension-stabilizing composition of the present invention, bacterial cellulose crystallizes through self-assembly, and the microfibrils are tightly aggregated into 40-80nm ribbon-like fiber bundles, which are interwoven to form a fine spatial network, forming a nanoscale three-dimensional network structure with high porosity; after the acrylic acid (ester) copolymer is neutralized with an alkali, the polymer main chain can fully extend in the system through the repulsive force between charges to form a gel network structure. The present invention has found that the three-dimensional network structure of bacterial cellulose and the gel network structure of acrylic acid (ester) copolymer can stably suspend various types of particulate matter without increasing the viscosity of the system (high viscosity will make the product difficult to pour), and have excellent suspension stability regardless of high temperature (≥50°C) or low temperature (≤-10°C) environment.

[0012] The present invention has found in the research and development process that single bacterial cellulose does not have suspension ability, and needs to be combined with an appropriate amount of surfactant to make it better dispersed in the system so that the suspension effect can be exerted. Suspension compositions containing bacterial cellulose all have good suspension stability effects and can remain stable even in high temperature environments. However, the present invention has found that the phenomenon of decreased suspension power will occur at low temperatures. For this reason, the present invention attempts to compound it with acrylic acid (ester) copolymers, and further finds that the two can make up for each other's suspension performance shortcomings after being combined in a certain proportion. The compounded composition has excellent suspension performance within the reasonable viscosity range of various types of toiletries and a wide temperature range. At present, there is no relevant literature report on the application of compounding bacterial cellulose and acrylic acid (ester) copolymers as suspension stable compositions.

[0013] In addition, due to its hydroxyl structure, bacterial cellulose is interconnected by hydrogen bonds within and between molecules, and has extremely high hydrophilicity and excellent water retention properties. The water holding rate is 1:50, so it has a strong water-holding and moisturizing ability, which can enhance the product's usability and solve the shortcomings of defoaming, poor product fluidity, and poor skin feel caused by a large amount of traditional polymer suspending agents in the product.

[0014] Preferably, the bacterial cellulose is 0.015-0.1%, and the acrylic acid (ester) copolymer is 0.4-0.6%.

[0015] In order to further improve the suspension stability, the present invention controls the contents of bacterial cellulose and acrylic acid (ester) copolymer within the above range.

[0016] Preferably, the monomers of the acrylic acid (ester) copolymer are at least two of acrylic acid, methacrylic acid, acrylic acid ester and methacrylic acid ester.

[0017] Preferably, the ester carbon chain length of the monomers of the acrylic acid (ester) copolymer is 1-3.

[0018] Preferably, the monomers of the acrylic acid (ester) copolymer are at least two of acrylic acid ester and methacrylic acid ester.

[0019] After examining different types of acrylic acid (ester) copolymers, the present invention found that the monomers used in the polymerization of acrylic acid (ester) copolymers have a certain influence on their suspension stability. Generally, the carbon chain of the monomer ester group is between C1 and C8, and the carbon chain of the ester group is between C1 and C3, which has the best suspension stability. Above C3, the hydrophobicity increases, the suspension performance decreases, and the suspended particles will slightly sink at low temperatures. In addition, acrylic acid esters have a better suspension effect than acrylic acid copolymers. This is because acids have strong hydrophilicity, while acrylic acid esters have a certain degree of hydrophobic modification, which has higher surface activity, thereby maximizing their suspension effect.

[0020] Preferably, the bacterial cellulose is obtained by microbial fermentation using sugars as raw materials.

[0021] Bacterial cellulose is non-toxic, safe, gentle, and has excellent biocompatibility. Under natural conditions, bacterial cellulose can be degraded into small molecular sugars, causing no environmental pollution. Its addition process is simple and easy to operate. Furthermore, its use in surfactant systems has no effect on foaming or viscosity.

[0022] Preferably, the surfactant is one or more of anionic surfactants, nonionic surfactants and amphoteric surfactants.

[0023] Furthermore, the anionic surfactant is one or more of sodium lauryl sulfate, sodium laureth sulfate, sodium cocoyl propionate, sodium lauroyl sarcosinate, sodium lauroyl glutamate and potassium cocoyl glycinate; the nonionic surfactant is one or more of lauryl glucoside, cocoyl glucoside, cocamide MEA, PEG-120 methyl glucose dioleate; the amphoteric surfactant is one or more of cocamidopropyl betaine, sodium cocoamphoacetate, sodium lauroamphoacetate and lauramidopropyl hydroxysulfonate.

[0024] Preferably, the pH regulator is one or more of citric acid, lactic acid, sodium citrate, potassium hydroxide, sodium hydroxide and triethanolamine;

[0025] Preferably, the salt is one or more of sodium chloride, potassium chloride, and magnesium chloride. In a second aspect, the present invention provides a method for preparing a suspension-stable composition with a wide temperature range, comprising: mixing bacterial cellulose and water, homogenizing the mixture at a speed of 500-5000 rpm for 0.5-2 hours to fully swell the bacterial cellulose, and then sequentially adding a surfactant, an acrylic acid (ester) copolymer, a pH adjuster, and a salt, and stirring the mixture uniformly.

[0026] The present invention further found that the bacterial cellulose cannot maximize its suspension ability by stirring alone, but needs to be treated by homogenization. This is because there are a large number of hydroxyl groups on the bacterial cellulose, and there are strong intermolecular and intramolecular hydrogen bonds, which make it difficult to dissolve. The stirring method can only allow the solvent molecules to slowly diffuse into the aggregated structure of the bacterial cellulose, causing it to slowly swell. Under a homogeneous external force, the hydrogen bond interaction between the cellulose and solvent molecules can exceed the interaction force between its molecules and between molecules, so that the bacterial cellulose can fully stretch, disperse in the solvent, and form a uniform three-dimensional network structure in the system, thereby playing an excellent suspension role.

[0027] In a third aspect, the present invention provides a surfactant system comprising the suspension stabilizing composition and an adjuvant.

[0028] Preferably, the auxiliary agent is one or more of a chelating agent, a conditioning agent, a fat, a fragrance, a pH regulator, a moisturizer, a preservative, an antibacterial agent, an antidandruff agent and a sunscreen.

[0029] Preferably, the surfactant system is shampoo, facial cleanser, shower gel, hand soap or laundry detergent.

[0030] The suspension stabilizing composition of the present invention is suitable for most surfactant-based cleaning products, such as shampoo, facial cleanser, shower gel, hand soap, laundry detergent, etc. It has an excellent suspension effect on particulate matter such as hydrated silica, flower petals, mica powder, jojoba particles, walnut shell particles, silicone oil, grease, microcapsules, cellulose particles, etc. in the system, and has a wide range of applications.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The suspension stabilizing composition of the present invention contains bacterial cellulose and acrylic acid (ester) copolymers in a specific ratio, which can improve the suspension stability of the product at high temperatures (≥50°C) and low temperatures (≤-10°C) without affecting the viscosity of the system.

[0033] (2) The suspension stabilizing composition of the present invention is applicable to a variety of surfactant systems, has a wide range of applications, and is highly practical.

[0034] (3) Bacterial cellulose is non-toxic, safe, mild, and has good biocompatibility. It can also be naturally degraded and is environmentally friendly. In addition, bacterial cellulose has strong water-holding and moisturizing capabilities, which can enhance the user experience of the product and solve the shortcomings of the product caused by a large amount of traditional polymer suspending agents, such as defoaming, poor product fluidity, and poor skin feel.

[0035] (4) The present invention further prefers that the ester carbon chain of the monomer of the acrylic acid (ester) copolymer is between C1 and C3 and is acrylic acid ester, which has the best suspension stability.

[0036] (5) The present invention preferably pre-treats bacterial cellulose in a homogenous manner, which can further enhance its suspension effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a comparison chart of the performance of Example 7, Comparative Example 3 and Comparative Example 4;

[0038] Figure 2 The figure is a comparison chart of the performance of Example 8, Comparative Example 5 and Comparative Example 6. DETAILED DESCRIPTION

[0039] The present invention will be further described below with reference to the embodiments.

[0040] Overall embodiment

[0041] The invention discloses a suspension stabilizing composition with a wide temperature range, comprising the following components in weight percentage: 0.01-5% bacterial cellulose, 0.1-10% acrylic acid (ester) copolymer, 5-30% surfactant, 0-2% pH regulator, 0-3% salt and the balance water.

[0042] Preferably, the bacterial cellulose is 0.015-0.1%, and the acrylic acid (ester) copolymer is 0.4-0.6%.

[0043] The monomers of the acrylic acid (ester) copolymer are acrylic acid, methacrylic acid, or at least two of acrylic acid ester and methacrylic acid ester. Furthermore, the ester carbon chain length of the monomers of the acrylic acid (ester) copolymer is 1-3, and the monomers of the acrylic acid (ester) copolymer are at least two of acrylic acid ester and methacrylic acid ester. The bacterial cellulose is obtained from carbohydrates through microbial fermentation. The surfactant is one or more of anionic surfactants, nonionic surfactants, and amphoteric surfactants. Furthermore, the anionic surfactant is one or more of sodium lauryl sulfate, sodium laureth sulfate, sodium cocoamidopropionate, sodium lauroyl sarcosinate, sodium lauroyl glutamate, and potassium cocoyl glycinate; the nonionic surfactant is one or more of lauryl glucoside, cocoyl glucoside, cocamide MEA, and PEG-120 methyl glucose dioleate; the amphoteric surfactant is one or more of cocamidopropyl betaine, sodium cocoamphoacetate, sodium lauroamphoacetate, and lauramidopropyl hydroxysulfobetaine; the pH adjuster is one or more of citric acid, lactic acid, sodium citrate, potassium hydroxide, sodium hydroxide, and triethanolamine; and the salt is one or more of sodium chloride, potassium chloride, and magnesium chloride.

[0044] A method for preparing a suspension stable composition with a wide temperature range comprises mixing bacterial cellulose and water, homogenizing at a speed of 500-5000 rpm for 0.5-2 hours to fully swell the bacterial cellulose, then sequentially adding a surfactant, an acrylic acid (ester) copolymer, a pH adjuster and a salt, and stirring evenly.

[0045] A surfactant system comprises the above suspension stabilizing composition and an auxiliary agent. The surfactant system is shampoo, facial cleanser, shower gel, hand soap or laundry detergent.

[0046] Preferably, the auxiliary agent is one or more of a chelating agent, a conditioning agent, a fat, a fragrance, a pH regulator, a moisturizer, a preservative, an antibacterial agent, an antidandruff agent and a sunscreen.

[0047] Specific cases

[0048] Test Examples 1-6 and Comparative Examples 1-2:

[0049] The raw materials and weight percentages of Test Examples 1-6 and Comparative Examples 1-2 are shown in Table 1.

[0050] Table 1 Formula table of test examples 1-6 and comparative examples 1-2

[0051]

[0052] According to the formulation shown in Table 1, the process for Test Examples 1-6 is as follows: bacterial cellulose is mixed with water, homogenized at 3000 rpm for 0.5 h to fully swell, and a surfactant, pH adjuster, salt, and silica frosted particles are added in sequence, and stirred evenly. The process for Comparative Examples 1-2 is as follows: bacterial cellulose is mixed with water and then only stirred without homogenization. The suspended matter is silica frosted particles with a larger specific gravity. The stability test results of each test example and comparative example are shown in Table 2.

[0053] Table 2 Stability test results of test examples 1-6 and comparative examples 1-2

[0054]

[0055] Note: √ indicates that the sample is stable and the suspended matter is evenly distributed; ○ indicates that a small amount of suspended matter floats up or sinks; × indicates that a large amount of suspended matter floats up or sinks.

[0056] During the experiment, it was found that the bacterial cellulose aqueous solution alone had no suspending ability and needed to be combined with an appropriate amount of surfactant to better disperse it in the system in order to play a suspending role. It can be seen from Test Examples 1-6 that the suspension stabilization composition containing bacterial cellulose has a good suspension stabilization effect in various surfactant systems. The sample is stable after being placed in a high temperature environment of 52°C for 30 days. As the amount of bacterial cellulose increases, it still has excellent suspension performance for silica particles with a larger specific gravity even at a lower viscosity. However, after being placed at low temperatures for a period of time, especially at an extreme low temperature of -18°C for a period of time, the system will experience a decrease in suspension force. As the bacterial cellulose content in the system increases, the degree of decrease in suspension force at low temperatures decreases, but this phenomenon still exists.

[0057] In addition, it can be seen from Comparative Examples 1-2 that bacterial cellulose needs to be homogenized to better exert its suspension effect. Stirring alone cannot maximize the suspension capacity of bacterial cellulose. This is because there are a large number of hydroxyl groups on bacterial cellulose, and there are strong intermolecular and intramolecular hydrogen bonds, which makes it difficult to dissolve. The stirring method can only allow the solvent molecules to slowly diffuse into the aggregate structure of bacterial cellulose, causing it to slowly swell. Only under a homogeneous external force can the hydrogen bond interaction between cellulose and solvent molecules exceed the intramolecular and intermolecular interaction forces, so that the bacterial cellulose can fully stretch and disperse in the solvent, forming a uniform three-dimensional network structure in the system, thereby playing an excellent suspension role.

[0058] Test Example 7-11:

[0059] The raw materials and weight percentages of Test Examples 7-11 are shown in Table 3.

[0060] Table 3 Recipe table for test examples 7-11

[0061] Element Test Example 7 Test Example 8 Test Example 9 Test Example 10 Test Example 11 water To 100 To 100 To 100 To 100 To 100 Sodium Laureth Sulfate 10 11 11.25 10 / Sodium Lauryl Sulfate / / 0.9 / / Sodium Cocoamidopropionate 4 / / 1.2 7.5 Cocamidopropyl Betaine 1.2 1.2 0.9 1.2 4.5 Cocamide MEA 0.45 0.6 0.45 0.3 / Lauryl Glucoside / / / / 2 Acrylic acid (ester) copolymer (SF-2) 0.9 1.35 1.5 1.8 1.8 KOH 0.02 0.03 0.05 0.05 0.05 NaCl 1.5 0.25 025 / / Silica scrub particles 0.12 0.12 0.12 0.12 0.12 Viscosity, mPa.s 15900 9000 8310 15720 12300

[0062] According to the formula shown in Table 3, water, surfactant, acrylic acid (ester) copolymer, pH adjuster, salt, and silica frosting particles were added in sequence and stirred evenly. The stability test results of each test example are shown in Table 4.

[0063] Table 4 Stability investigation results of test cases 7-11

[0064]

[0065]

[0066] Note: √ indicates that the sample is stable and the suspended matter is evenly distributed; ○ indicates that a small amount of suspended matter floats up or sinks; × indicates that a large amount of suspended matter floats up or sinks.

[0067] As can be seen from Test Examples 7-11, after being placed in a high-temperature environment at 52°C for 30 days, the suspension ability of the acrylic acid (ester) copolymer decreases, causing the particles to sink. Only when the acrylic acid (ester) copolymer reaches a certain amount can the system have better suspension power. Since acrylic acid (ester) copolymers have a strong thickening effect, a higher amount of acrylic acid (ester) copolymer often leads to excessively high system viscosity, making it difficult to pour or spread when used in products.

[0068] Examples 1-6:

[0069] The raw materials and weight percentages of Examples 1-6 are shown in Table 5.

[0070] Table 5 Formulations of Examples 1-6

[0071]

[0072] According to the formulation shown in Table 5, bacterial cellulose was mixed with water and homogenized at 3000 rpm for 0.5 h to fully swell. A surfactant, an acrylic acid (ester) copolymer, a pH adjuster, and a salt were then added in sequence and stirred until uniform. The stability test results of each example are shown in Table 6.

[0073] Table 6 Stability test results of Examples 1-6

[0074]

[0075]

[0076] Note: √ indicates that the sample is stable and the suspended matter is evenly distributed; ○ indicates that a small amount of suspended matter floats up or sinks; × indicates that a large amount of suspended matter floats up or sinks.

[0077] As shown in Examples 1-4, bacterial cellulose and acrylic acid (ester) copolymers are combined in a certain proportion to make up for each other's suspension performance short board, so that the sample has excellent suspension performance within the reasonable viscosity range of various types of toiletries and a wide temperature range, and silicon dioxide particles, petals, mica, walnut shell particles, etc. can be stably suspended, and the suspension cost is reduced. Patent CN114306135A promotes existing acrylic acid (ester) copolymers, using EMUL 400 acrylic acid (ester) copolymers as suspending agents, but is only applicable to the surfactant system of fatty alcohol polyoxyethylene ether sodium sulfate and cocamidopropyl betaine. Patent CN113355176A discloses a kind of suspension cleaning composition, which is reasonably matched by surfactants, fatty acids, fatty alcohols, inorganic salts, etc. to form a liquid crystal structure with suspension ability having a higher viscosity, and viscosity can reach about 44000mpa s.

[0078] As shown in Examples 5-6, when the amount of acrylic acid (ester) copolymer is too low, the particles will still sink at low temperatures. However, the inventors discovered during the experiment that when the amount of acrylic acid (ester) copolymer exceeds a certain amount, the suspension performance at low temperatures is actually reduced to a certain extent. This is because as the amount of acrylic acid (ester) copolymer increases, the two different types of network structures form an overly dense spatial structure, causing the surfactant to form local micelles at low temperatures, ultimately squeezing some suspended particles out of the network structure.

[0079] In addition, in suspension stable composition of the present invention, monomer during the polymerization of acrylic acid (ester) copolymer has certain influence on its suspension stability, and the ester group carbon chain of general its monomer is at C1~C8, and carbon chain is best between C1~C3 its suspension stability, surpasses C3, and hydrophobicity strengthens, and the suspension performance of suspension composition descends, and suspended particles can slightly sink at low temperatures, but is not very obvious. In addition, acrylic acid ester is better than the suspension effect of acrylic acid copolymer, and this is because acid has very strong hydrophilicity, and acrylic acid ester has higher surface activity through hydrophobic modification to a certain degree, thereby can bring into play its suspension effect to greatest extent. Above-mentioned two kinds of phenomena all illustrate that in this suspension stable composition, acrylic acid (ester) copolymer could make its maximum suspension effect of performance through suitable hydrophobic modification.

[0080] Example 7 and Comparative Examples 3-4: Shower gel comprising the suspension-stabilized composition of the present invention:

[0081] The raw materials and weight percentages of Example 7 and Comparative Examples 3-4 are shown in Table 7. According to conventional methods in the art, other additives are added to the suspension stabilizing composition of the present invention to prepare a shower gel.

[0082] Table 7 Formulation table and formulation performance test results of Example 7 and Comparative Examples 3-4

[0083] Components Example 7 Comparative Example 3 Comparative Example 4 water To100 To100 To100 bacterial cellulose 0.015 0.0225 / EDTA-2Na 0.1 0.1 0.1 citric acid 0.01 0.08 0.01 Sodium citrate 0.15 0.1 0.15 Sodium Laureth Sulfate 10 10 10 Sodium Cocoamidopropionate 1.2 1.2 1.2 Cocamidopropyl Betaine 1.5 1.5 1.5 Cocamide MEA 0.6 0.6 0.6 Acrylic acid (ester) copolymer (SF-2) 0.45 / 1.8 KOH 0.02 / 0.03 NaCl 1.5 1.5 1.5 Trimethylglycine 0.5 0.5 0.5 Lauryl Glucoside 1.5 1.5 1.5 Casson 0.06 0.06 0.06 essence 1 1 1 suspended particles 0.2 (petal) 0.2 (petal) 0.2 (petal) pH 6.55 6.50 6.61 Viscosity, mPa.s 4500 4010 21300 Foam, mm 175 180 155

[0084] As shown in Table 7, in the shower gel formula, bacterial cellulose has no effect on the foam or viscosity of the sample. Excessive acrylic acid (ester) copolymers will inhibit foaming, reduce foam height, and significantly increase the viscosity of the system. The stability test results of Example 7 and Comparative Examples 3-4 under various conditions are shown in Table 8:

[0085] Table 8 Stability of Example 7 and Comparative Examples 3-4 under various storage environments

[0086]

[0087] Note: √ indicates that the sample is stable and the suspended matter is evenly distributed; ○ indicates that a small amount of suspended matter floats up or sinks; × indicates that a large amount of suspended matter floats up or sinks.

[0088] The stability test results in Table 8 show that the suspension-stabilizing composition of Example 7 has good compatibility in the body wash system, can stably suspend various particles over a wide temperature range, and does not cause suspended particles to fall or float during long-term storage. In Comparative Example 3, only bacterial cellulose was used, which resulted in a decrease in suspension power at low temperatures. In Comparative Example 4, a higher amount of acrylic acid (ester) copolymer was added. Although the suspension was stable, the foaming of the body wash was reduced, and the sample viscosity was high, affecting the feel of the product.

[0089] The shower gels of Example 7, Comparative Example 3 and Comparative Example 4 were subjected to consumer testing and were given to 50 volunteers aged 20-50 years old, including 20 male volunteers and 30 female volunteers. Each shower gel was used for two consecutive weeks, and the various performances of the shower gel were scored. The evaluation items were application satisfaction, foam richness, flushing freshness, satisfaction with the cleaning effect, skin moisturization after washing, and overall satisfaction. The scoring system uses a 7-point system, with 7 points being the best and 1 point being the worst. The higher the score, the better the effect. The use effect evaluation of the samples is as follows: Figure 1 shown.

[0090] Depend on Figure 1 It can be seen that Comparative Example 4 is lower than the other two products in all performance indicators. This is because the large amount of acrylic acid (ester) copolymer causes the system to have a higher viscosity, which is difficult to spread when applied and reduces the foam of the system. In addition, this type of high molecular polymer is easy to remain on the skin, often giving people a false and slippery feeling when rinsing, which reduces the experience during use.

[0091] The foam richness of the other two samples is good, indicating that bacterial cellulose does not have a negative impact on the foam of the product. The samples of Example 7 and Comparative Example 3 provide good skin moisturizing satisfaction after washing. This is because bacterial cellulose has a fine three-dimensional network structure that can absorb a large amount of water and can fix more water through its own hydrogen bond structure. Therefore, it has good moisturizing properties, thereby improving the skin feel after use.

[0092] Example 8 and Comparative Examples 5-6: Shampoo containing the suspension stabilizing composition of the present invention:

[0093] The raw materials and weight percentages of Example 8 and Comparative Examples 5-6 are shown in Table 9. According to conventional methods in the art, other additives are added to the suspension stabilizing composition of the present invention to prepare shampoo.

[0094] Table 9 Formulation table and formulation performance test results of Example 8 and Comparative Examples 5-6

[0095] Components Example 8 Comparative Example 5 Comparative Example 6 water To 100 To 100 To 100 bacterial cellulose 0.015 0.02 / EDTA-2Na 0.1 0.1 0.1 citric acid 0.01 0.01 0.01 Sodium citrate 0.15 0.15 0.15 Sodium Laureth Sulfate 10 10 10 glycerin 2 2 2 Cocamidopropyl Betaine 1.2 1.2 1.2 Sodium Cocoamidopropionate 1.2 1.2 1.2 Cocamide MEA 0.6 0.6 0.6 Acrylates copolymer (SF-2) 0.45 / 1.5 KOH 0.02 / 0.03 essence 0.8 0.8 0.8 Polyquaternium-10 0.3 0.3 0.3 NaCl 1.5 1.5 1.5 Casson 0.08 0.08 0.08 shredded ginger 0.3 0.3 0.3 pH 6.52 6.63 6.61 Viscosity, mPa.s 4800 4440 19600 Foam, mm 124 133 105

[0096] As shown in Table 9, bacterial cellulose has no effect on the foam or viscosity of the shampoo formulation. Excessive amounts of acrylic acid (ester) copolymers inhibit foaming, reduce foam height, and significantly increase the viscosity of the system. The stability test results of Example 8 and Comparative Examples 5-6 under various conditions are shown in Table 10:

[0097] Table 10 Stability of Example 8 and Comparative Examples 5-6 under various storage environments

[0098]

[0099] Note: √ indicates that the sample is stable and the suspended matter is evenly distributed; ○ indicates that a small amount of suspended matter floats up or sinks; × indicates that a large amount of suspended matter floats up or sinks.

[0100] The stability test results in Table 10 demonstrate that the suspension-stabilizing composition exhibits good compatibility in shampoo systems, stably suspending various particles over a wide temperature range. The composition also prevents suspended particles from falling or floating during long-term storage. Comparative Example 5, which employed only bacterial cellulose, exhibited a decrease in suspending power at low temperatures. Comparative Example 6, which incorporated a higher amount of acrylic acid (ester) copolymer, stabilized the suspension, but reduced the foam height of the shampoo and resulted in a higher sample viscosity.

[0101] The shampoos of Example 8, Comparative Example 5 and Comparative Example 6 were tested on 50 volunteers aged 20-50 years. Among them, there were 20 male volunteers and 30 female volunteers. The volunteers washed their hair in the same way when using the shampoo. Each shampoo was used for two consecutive weeks. The performance of the shampoo was scored. The evaluation items were foam richness, flushing smoothness, dry hair combing, dry hair smoothness, freshness retention, and overall satisfaction. The scoring system uses a 7-point system, with 7 points being the best and 1 point being the worst. The higher the score, the better the effect. The evaluation of the various aspects of the sample use effect is as follows: Figure 2 shown.

[0102] Depend on Figure 2 It can be seen that Comparative Example 6 is lower than the other two products in all performance indicators. This is because a large amount of acrylic acid (ester) copolymer reduces the foaming of the system. In addition, this type of high molecular polymer will bring a rough feeling to wet hair when rinsed with water, thereby reducing the combing properties after use.

[0103] It can be seen from Example 8 and Comparative Example 5 that the application of bacterial cellulose in shampoo can improve the comprehensive shampooing performance of the shampoo. The addition of bacterial cellulose helps to improve the shampoo's smoothness when rinsed with water, wet hair combing properties, and dry hair combing properties. While playing a suspending role, it can also improve the use effect of the product.

[0104] Unless otherwise specified, the raw materials and equipment used in the present invention are commonly used in the art; the methods used in the present invention are conventional methods in the art unless otherwise specified.

[0105] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A suspension stable composition with a wide temperature range, characterized in that: The following components are included in weight percentage: Bacterial cellulose (0.0125 / 0.998)%-0.1%, Acrylic acid (ester) copolymer 0.4%-0.6%, Surfactant 5%-30%, pH regulator 0-2%, Salt 0-3%, Water balance; The ester carbon chain length of the monomer of the acrylic acid (ester) copolymer is 1-3; The monomers of the acrylic acid (ester) copolymer are at least two of acrylic acid ester and methacrylic acid ester.

2. The suspension stabilizing composition according to claim 1, wherein: The bacterial cellulose is (0.0125 / 0.998)%-(0.015 / 0.998)%, and the acrylic acid (ester) copolymer is (0.45 / 0.998)%-0.6%.

3. The suspension stabilizing composition according to claim 1 or 2, wherein: The surfactant is one or more of anionic surfactants, nonionic surfactants and amphoteric surfactants.

4. The suspension stabilizing composition according to claim 3, wherein: The anionic surfactant is one or more of sodium lauryl sulfate, sodium laureth sulfate, sodium cocoylaminopropionate, sodium lauroyl sarcosinate, sodium lauroyl glutamate and potassium cocoyl glycinate; The nonionic surfactant is one or more of lauryl glucoside, cocoyl glucoside, cocamide MEA, and PEG-120 methyl glucose dioleate; The amphoteric surfactant is one or more of cocamidopropyl betaine, sodium cocoamphoacetate, sodium lauroamphoacetate and lauroamidopropyl hydroxysulfobetaine.

5. The suspension stabilizing composition according to claim 1 or 2, characterized in that: The pH regulator is one or more of citric acid, lactic acid, sodium citrate, potassium hydroxide, sodium hydroxide and triethanolamine.

6. The suspension stabilizing composition according to claim 1 or 2, characterized in that: The salt is one or more of sodium chloride, potassium chloride and magnesium chloride.

7. A method for preparing a suspension stable composition according to any one of claims 1 to 6, characterized in that include: The bacterial cellulose and water are mixed and homogenized to fully swell the bacterial cellulose. Then, a surfactant, an acrylic acid (ester) copolymer, a pH regulator and a salt are added and stirred evenly.

8. A surfactant system, characterized in that: A suspension stabilizing composition comprising the suspension stabilizing composition according to any one of claims 1 to 6, and an auxiliary agent; The auxiliary agent is one or more of a chelating agent, a conditioning agent, a grease, a fragrance, a pH regulator, a moisturizer, a preservative, an antibacterial agent, an antidandruff agent and a sunscreen.

9. The surfactant system according to claim 8, wherein: The surfactant system is shampoo, facial cleanser, shower gel, hand soap or laundry detergent.

10. Use of a composition comprising bacterial cellulose and acrylic acid (ester) copolymers for improving the high-temperature and low-temperature suspension stability of a surfactant system, characterized in that: The composition comprises the following components in weight percentage: bacterial cellulose (0.0125 / 0.998)%-0.1%, acrylic acid (ester) copolymer 0.4%-0.6%, surfactant 5%-30%, pH regulator 0-2%, salt 0-3%, and water as the balance; The ester carbon chain length of the monomer of the acrylic acid (ester) copolymer is 1-3; The monomers of the acrylic acid (ester) copolymer are at least two of acrylic acid ester and methacrylic acid ester; The high temperature is 52°C, and the low temperature is 0°C, 5°C or -18°C.

11. A method for improving the high-temperature and low-temperature suspension stability of a surfactant system, characterized by: A composition comprising bacterial cellulose and an acrylic acid (ester) copolymer is added to the surfactant system; the composition comprises the following components in percentages by weight: Bacterial cellulose (0.0125 / 0.998)%-0.1%, acrylic acid (ester) copolymer 0.4%-0.6%, surfactant 5%-30%, pH adjuster 0-2%, salt 0-3%, balance water; The ester carbon chain length of the monomer of the acrylic acid (ester) copolymer is 1-3; The monomers of the acrylic acid (ester) copolymer are at least two of acrylic acid ester and methacrylic acid ester; The high temperature is 52°C, and the low temperature is 0°C, 5°C or -18°C.

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