Narrow particle size distribution microscale liquid crystal suspending stabilizer, method of making and use thereof

Abstract

The present application discloses a narrow particle size distribution micron liquid crystal suspension stabilizer, a preparation method and application thereof, and relates to the technical field of daily chemicals. The narrow particle size distribution micron liquid crystal suspension stabilizer comprises the following raw materials in mass percentage: 2-10% of hydrogenated castor oil, 10-40% of amphoteric surfactant, 0.1-10% of non-ionic surfactant, 0.2-1% of preservative, and the balance of water; the non-ionic surfactant at least comprises glycerol monoleate; and the particle size distribution curve of the narrow particle size distribution micron liquid crystal suspension stabilizer has a single main peak structure. By using the present application, the narrow particle size distribution micron liquid crystal suspension stabilizer with excellent suspension stabilizing effect can be obtained, and the long-term and uniform suspension stabilizing effect of daily chemical products can be improved.

Description

Technical Field

[0001] This invention relates to the field of daily chemical products technology, and in particular to a narrow particle size distribution micron-sized liquid crystal suspension stabilizer, its preparation method, and its application. Background Technology

[0002] Shampoos, shower gels, facial cleansers, and other daily chemical products are mostly complex multiphase composite systems. Their formulations typically contain various components with different physical properties, including solid functional particles, suspended colored microparticles, pearlescent flakes, active microcapsules, and various incompatible liquid components. These multiphase systems are highly susceptible to phase separation during production, storage, and settling, manifesting as solid particle sedimentation, functional droplet floating or aggregation, and stratification of differentiated components. This not only damages the product's intended aesthetic appearance, causing the pearlescent texture and suspended microparticle decorative effect to fail, but also results in uneven distribution of functional components, significantly reducing the product's efficacy and shelf-life stability. Therefore, suspension stabilization technology is the core foundation determining the stability, functionality, and aesthetics of multiphase systems in daily chemical products, and it is also a key research direction in the field of daily chemical formulation development.

[0003] To effectively address phase separation and component instability issues in multiphase systems of daily chemical products, the industry conventionally uses specialized suspending agents to construct stable systems. Currently, the mainstream suspending agents include carbomer, TAB-2, SF-1, and hydrogenated castor oil. Among these, hydrogenated castor oil, compared to other suspending agents, possesses significant advantages such as good suspension compatibility, high cost-effectiveness, and minimal negative impact on the original physicochemical properties, cleaning and conditioning properties, and sensory properties of daily chemical products. It is compatible with most conventional daily chemical formulation systems and has therefore been widely used in the field of suspension stabilization in daily chemical products, becoming a mainstream raw material for suspension stabilization systems in the market.

[0004] However, in practical applications, existing suspension stabilization systems based on hydrogenated castor oil still have significant technical shortcomings. Their overall suspension stability is limited, making it difficult to meet the production and usage requirements of high-quality daily chemical products. In particular, for materials such as high-density solid particles and high-density functional components in the formulation, traditional hydrogenated castor oil suspension systems cannot achieve long-term, uniform suspension stabilization. This causes these high-density components to gradually settle and clump during product storage, leading to quality problems such as product stratification and bottom sedimentation. This seriously affects the quality consistency and shelf life of daily chemical products, and greatly limits the formulation development and quality upgrades of high-end suspension-type daily chemical products. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a narrow particle size distribution micron-level liquid crystal suspension stabilizer, which has excellent suspension stabilization effect and is beneficial to improving the long-lasting and uniform suspension stabilization effect of daily chemical products.

[0006] The technical problem to be solved by the present invention is to provide a method for preparing a narrow particle size distribution micron-sized liquid crystal suspension stabilizer. The method can obtain a narrow particle size distribution micron-sized liquid crystal suspension stabilizer with excellent suspension performance by using low-speed stirring, which can effectively reduce energy consumption and preparation cost.

[0007] The technical problem to be solved by the present invention is to provide a daily chemical product comprising the above-mentioned narrow particle size distribution micron-level liquid crystal suspension stabilizer, which has good suspension stability.

[0008] To address the aforementioned technical problems, this invention provides a narrow particle size distribution micron-scale liquid crystal suspension stabilizer, comprising the following raw materials by mass percentage: 2%~10% hydrogenated castor oil, 10%~40% amphoteric surfactant, 0.1%~10% nonionic surfactant, 0.2%~1% preservative, and the balance being water; The nonionic surfactant includes at least glyceryl oleate; The particle size distribution curve of the narrow-particle-size micron-sized liquid crystal suspension stabilizer exhibits a single main peak structure.

[0009] As an improvement to the above technical solution, the particle size distribution of the narrow particle size distribution micron-sized liquid crystal suspension stabilizer satisfies: D90-D10≤50μm, and D50≤35μm.

[0010] As an improvement to the above technical solution, the particle size distribution of the narrow particle size distribution micron-sized liquid crystal suspension stabilizer satisfies: D10 is 0.01μm~10μm, D50 is 0.1μm~30μm, and D90 is 8μm~50μm.

[0011] As an improvement to the above technical solution, based on volume content, the proportion of particles with a particle size ≤75μm in the narrow particle size distribution micron-level liquid crystal suspension stabilizer is >90%.

[0012] As an improvement to the above technical solution, the nonionic surfactant further includes one or more of polyglycerol ester emulsifiers, cocamide MEA, cocamide methyl MEA, cocamide DEA, and alkyl glycoside surfactants with an alkyl chain length of 8-18. The amphoteric surfactant is selected from one or more of the following: cocamidopropyl betaine, sodium lauroyl amphoteric acetate, lauroyl hydroxysulfonate, lauroamide propyl betaine, lauroamide propyl hydroxysulfonate, cocamidopropyl hydroxysulfonate, sodium cocamidopropyl acetate, and disodium cocamidopropyl diacetate. The preservatives include one or both of phenoxyethanol and ethylhexylglycerin.

[0013] As an improvement to the above technical solution, the nonionic surfactant is composed of glyceryl oleate and polyglycerol ester emulsifier; The mass ratio of the glyceryl oleate to the polyglycerol ester emulsifier is 1:0.25 to 1:2; The polyglycerol ester emulsifiers include one or more of polyglycerol-10 lauryl ester, polyglycerol-10 myristate ester, polyglycerol-10 stearate, and polyglycerol-10 oleate. The amphoteric surfactant is selected from cocamidopropyl betaine and / or sodium lauroyl amphoteric acetate.

[0014] As an improvement to the above technical solution, the mass percentage of glyceryl oleate in the narrow particle size distribution micron-scale liquid crystal suspension stabilizer is 2%~6%.

[0015] Accordingly, the present invention also provides a method for preparing a narrow-particle-size micron-sized liquid crystal suspension stabilizer, which includes the following steps: (1) Hydrogenated castor oil and nonionic surfactant are preheated to 85℃~90℃, completely dissolved, and kept at the temperature for a first preset time to obtain the first mixture; (2) Heat the amphoteric surfactant and water to 85℃~90℃, mix them evenly, and obtain the second mixture; (3) At 85℃~90℃, the first mixture and the second mixture are mixed and stirred at a stirring speed of N1 for a second preset time. (4) After the heat preservation and stirring in step (3) is completed, the temperature is reduced by stirring at the stirring speed of N2 until the temperature drops to 60℃~65℃; (5) At 60℃~65℃, after stirring at N3 for a third preset time, reduce the stirring speed to N4 and stir at N4 for a fourth preset time. (6) After the heat preservation and stirring in step (5) is completed, continue to cool and stir at the stirring speed of N4 until the temperature drops to 42℃~45℃; then add the preservative and continue to cool and stir at the stirring speed of N4 until the temperature drops to 30℃~35℃ to obtain a narrow particle size distribution micron-sized liquid crystal suspension stabilizer. Where N1≥N3≥N2>N4, and N1≤1000r / min.

[0016] As an improvement to the above technical solution, N1 is 800 r / min to 1000 r / min, N2 is 300 r / min to 1000 r / min, N3 is 800 r / min to 1000 r / min, and N4 is 150 r / min to 300 r / min; and / or, In step (1), the first preset time is 3 min to 5 min; In step (3), the second preset time is 8 min to 10 min; In step (4), the cooling rate is 1.0℃ / min to 1.5℃ / min; In step (5), the third preset time is 10 min to 12 min, and the fourth preset time is 10 min to 12 min; In step (6), the cooling rate is 1.0℃ / min to 1.5℃ / min.

[0017] Accordingly, the present invention also provides a daily chemical product comprising the above-mentioned narrow particle size distribution micron-sized liquid crystal suspension stabilizer, wherein the amount of the narrow particle size distribution micron-sized liquid crystal suspension stabilizer added in the daily chemical product is 0.1% to 20% by mass percentage.

[0018] Implementing this invention has the following beneficial effects: 1. This invention utilizes the synergistic effect among the components of a liquid crystal suspension stabilizer to form a high-strength three-dimensional network structure within the system. Simultaneously, it creates micron-sized micelles with a concentrated particle size distribution, resulting in a single main peak in the particle size distribution curve of the liquid crystal suspension stabilizer. This unique structure significantly enhances the system's storage modulus and suspension performance, giving the liquid crystal suspension stabilizer excellent suspension properties. It effectively immobilizes solid particles, pearlescent flakes, and functional microcapsules in daily chemical product formulations, fundamentally solving the technical problems of poor suspension stability, easy particle settling and agglomeration, and easy product stratification in traditional hydrogenated castor oil suspension systems. This allows for long-term maintenance of a uniform and stable state in multiphase systems of daily chemical products, meeting the production and use requirements of high-quality, long-shelf-life daily chemical products.

[0019] 2. This invention utilizes the synergistic effect of each component in a micron-sized liquid crystal suspension stabilizer with narrow particle size distribution, enabling the production of a liquid crystal suspension stabilizer with high energy storage modulus, micron-sized particle size, and narrow particle size distribution using only a solvent method combined with medium-low speed shearing (≤1000r / min). This eliminates the need for high-speed homogenization, which helps reduce production energy consumption and lower production costs. Attached Figure Description

[0020] Figure 1 This is a particle size distribution diagram of the narrow particle size distribution micron-sized liquid crystal suspension stabilizer of Embodiment 1 of the present invention; Figure 2 This is a particle size distribution diagram of the narrow particle size distribution micron-sized liquid crystal suspension stabilizer of Embodiment 2 of the present invention; Figure 3This is a particle size distribution diagram of the narrow particle size distribution micron-sized liquid crystal suspension stabilizer of Embodiment 3 of the present invention; Figure 4 This is a particle size distribution diagram of the narrow particle size distribution micron-sized liquid crystal suspension stabilizer of Embodiment 4 of the present invention; Figure 5 This is a particle size distribution diagram of the narrow particle size distribution micron-sized liquid crystal suspension stabilizer of Embodiment 5 of the present invention; Figure 6 This is a particle size distribution diagram of the suspension stabilizer in Comparative Example 1 of the present invention; Figure 7 This is a particle size distribution diagram of the suspension stabilizer in Comparative Example 2 of the present invention; Figure 8 This is a particle size distribution diagram of the suspension stabilizer in Comparative Example 3 of the present invention; Figure 9 This is a particle size distribution diagram of the suspension stabilizer in Comparative Example 4 of the present invention; Figure 10 This is a particle size distribution diagram of the suspension stabilizer in Comparative Example 5 of the present invention; Figure 11 This is the energy storage modulus diagram of the daily chemical product in Application Example 1; Figure 12 This is a loss factor diagram of the daily chemical products in Application Example 1; Figure 13 This is a physical product image of a narrow particle size distribution micron-sized liquid crystal suspension stabilizer according to an embodiment of the present invention; Figure 14 This is a polarized light microscope image of a narrow particle size distribution micron-sized liquid crystal suspension stabilizer according to an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0022] Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or in accordance with the product instructions. Raw materials whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0023] This invention provides a narrow particle size distribution micron-scale liquid crystal suspension stabilizer (hereinafter referred to as: liquid crystal suspension stabilizer), comprising the following raw materials in the following mass percentages: 2%~10% hydrogenated castor oil, 10%~40% amphoteric surfactant, 0.1%~10% nonionic surfactant, 0.2%~1% preservative, and the balance being water; The nonionic surfactant includes at least glyceryl oleate; The particle size distribution curve of the liquid crystal suspension stabilizer exhibits a single main peak structure.

[0024] It is worth noting that this invention, through the synergistic effect among the components in the liquid crystal suspension stabilizer, can form a high-strength three-dimensional network structure within the liquid crystal suspension stabilizer system. Simultaneously, it can form microscopic morphologies of micelles with micron-sized particles and narrow particle size distribution, exhibiting a single main peak structure in the particle size distribution curve. This unique structure significantly enhances the system's storage modulus and suspension performance, giving the liquid crystal suspension stabilizer excellent suspension properties. It can effectively fix solid particles, pearlescent flakes, and functional microcapsules in daily chemical product formulations, fundamentally solving the technical problems of poor suspension stability of high-density components, easy particle sedimentation and agglomeration, and easy product stratification in traditional hydrogenated castor oil suspension systems. It can maintain the uniform and stable state of multiphase systems in daily chemicals for a long time, meeting the production and use requirements of high-quality, long-shelf-life daily chemical products.

[0025] Further explanation: Due to its strong crystallinity, hydrogenated castor oil is prone to intramolecular aggregation, forming agglomerated crystals, and has a high melting point. Under high-temperature dispersion conditions, the hydrogen bonding within the system weakens, significantly reducing the emulsifying and dispersing ability of conventional surfactants. Directly adding them to hydrogenated castor oil not only fails to achieve effective dispersion but also exacerbates the intramolecular aggregation and crystallization of hydrogenated castor oil, forming large agglomerates. This results in a large particle size and wide particle size distribution in the system. Therefore, conventional surfactants are insufficient to fully dissolve and disperse hydrogenated castor oil at high temperatures, leading to uneven dispersion and poor suspension performance. In this invention, the nonionic surfactant includes at least glyceryl oleate. Glyceryl oleate has good lipophilicity, and the oleic acid chain in glyceryl oleate has a wider solubility layer for hydrogenated castor oil compared to the straight chain, enabling better dissolution of hydrogenated castor oil, lowering its melting point, and removing the crystal memory of hydrogenated castor oil at high temperatures. Glyceryl oleate can first combine with hydrogenated castor oil under high temperature conditions and promote its dissolution, effectively reducing the crystallinity of hydrogenated castor oil and preventing it from agglomerating into crystals, thereby forming smaller micelles. At the same time, glyceryl oleate then works synergistically with amphoteric surfactants to further refine and homogenize the dispersed phase size, resulting in a dispersion effect with small particle size and narrow particle size distribution, with particle size in the micrometer range, thereby improving the suspension uniformity and suspension stability of the liquid crystal suspension stabilizer.

[0026] Furthermore, based on the synergistic dispersing effect of glyceryl oleate and amphoteric surfactants, the liquid crystal suspension stabilizer of the present invention can be prepared by solvent method combined with medium-low speed shearing (≤1000 r / min) treatment, resulting in a liquid crystal suspension stabilizer with fine particle size, concentrated particle size distribution, and excellent suspension performance. This preparation process can effectively reduce energy consumption and production costs, and the prepared liquid crystal suspension stabilizer exhibits excellent dispersibility and is convenient to use in daily chemical products. In addition, the liquid crystal suspension stabilizer of the present invention can also be prepared using traditional high-speed homogenization processes.

[0027] The liquid crystal suspension stabilizer of the present invention has a liquid crystal structure. When applied to daily chemical products, it can form a stable liquid crystal micro-network in the products, suspending and stabilizing insoluble components, thereby preventing solid particles such as mica powder and high-density active components from settling or stratifying, and preventing light components from floating.

[0028] Preferably, the liquid crystal suspension stabilizer is prepared using a stirring speed of ≤1000 r / min.

[0029] It should be noted that the particle size distribution curve of the liquid crystal suspension stabilizer described in this invention exhibits a single main peak structure, meaning that only one main peak exists in the particle size distribution curve. Specifically, the curve may contain only a single peak shape (see the particle size distribution diagrams of Examples 2, 3, and 5), or it may have a small number of trailing peaks in addition to the main peak (see the particle size distribution diagrams of Examples 1 and 4), and the vast majority of particles in the system are concentrated within the particle size range corresponding to the main peak. Specifically, the main peak in the single main peak structure refers to the distribution peak with the highest peak height in the particle size distribution curve, and the peak height of the main peak is ≥4%. Preferably, the peak height of the main peak is 4%~16%, and the peak height of the trailing peak is <3.5%.

[0030] The particle size distribution curve of the liquid crystal suspension stabilizer of the present invention exhibits a single main peak structure, indicating that its particle size distribution is more concentrated, thereby effectively improving the suspension stability performance of the liquid crystal suspension stabilizer.

[0031] In one embodiment, the liquid crystal suspension stabilizer has a particle size distribution range of 0.01 μm to 100 μm and a volume average particle size of 0.1 μm to 50 μm. The liquid crystal suspension stabilizer in this embodiment has a narrow particle size distribution and small particle size, which is at the micrometer level and is beneficial to improving the suspension stabilizer performance of the liquid crystal suspension stabilizer.

[0032] In one embodiment, the particle size distribution of the liquid crystal suspension stabilizer satisfies: D90-D10≤50μm, and D50≤35μm. Wherein, D10 refers to 10% of the volume of particles in the suspension stabilizer being smaller than this particle size, D50 (i.e., median particle size) refers to 50% of the volume of particles in the suspension stabilizer being smaller than this particle size, and D90 refers to 90% of the volume of particles in the suspension stabilizer being smaller than this particle size.

[0033] In this embodiment, the difference between D90 and D10 is small, and D50 is also relatively small, indicating that the overall particle size of the liquid crystal suspension stabilizer is small and the particle size distribution is concentrated and uniform. This is beneficial to further enhance the strength of the three-dimensional network structure and further improve the suspension stability effect of the liquid crystal suspension stabilizer. In this way, it can stably support high-density heavy solid particles, pearlescent sheets and functional microcapsules, etc., so that it is not easy to have adverse problems such as sedimentation, stratification and bottom clumping during long-term storage.

[0034] When the dispersed particle size of hydrogenated castor oil is large, the crystal particles themselves require strong hydrogen bonding to maintain suspension stability in the system, which weakens the overall hydrogen bond network strength, resulting in insufficient suspension support capacity. If the particle size distribution of the system is uneven, it will affect the tight arrangement of the crystal network in the system, reduce the overall strength of the network structure, and make it difficult to achieve long-term suspension stability. In addition, hydrogenated castor oil can usually form various crystal forms such as fibrous, irregular, spherical, dendritic, short needle-like, and rose-shaped. Among them, irregular, short needle-like, and spherical crystals have basically no molecular entanglement or crystal overlap in the system, and the crystal network structure formed is relatively weak, with poor suspension carrying capacity. This invention uses a compound system of glyceryl oleate and amphoteric surfactant. This compound system has a significant synergistic effect in dispersing hydrogenated castor oil and preparing micelles with small particle size and narrow distribution. At the same time, glyceryl oleate itself has a certain degree of crystallinity, which can induce the growth of hydrogenated castor oil crystals into fibrous and rose-shaped crystal forms (such as...). Figure 14 As shown in the figure, this type of crystal form easily forms a continuous crystal network that is entangled and densely overlapped within the system, which greatly improves the overall strength of the hydrogen bond network and the crystal network structure, giving the system a high energy storage modulus. This, in turn, endows the liquid crystal suspension stabilizer with excellent suspension stability performance, which can effectively overcome the defects of traditional systems that are insufficient in suspending solid particles and are prone to sedimentation and stratification, and meet the suspension stability requirements of multiphase systems in daily chemical industry.

[0035] Preferably, the particle size distribution of the narrow particle size distribution micron-sized liquid crystal suspension stabilizer satisfies the following: D10 is 0.01μm~10μm, D50 is 0.1μm~30μm, and D90 is 8μm~50μm.

[0036] Under these particle size constraints, the liquid crystal suspension stabilizer exhibits a moderate particle size and a concentrated and uniform particle size distribution. This avoids both excessive fine particles that can lead to agglomeration and bridging, and excessive coarse particles that can cause system sedimentation and stratification. Consequently, it significantly improves the suspension stability of the composition itself, making it less prone to stratification and sedimentation during long-term storage. Furthermore, this well-matched particle size distribution allows the composition to possess superior dispersibility and compatibility in chemical matrices. Upon addition, it disperses rapidly and uniformly without large particle agglomeration or localized flocculation, making it more convenient to use. The good particle size uniformity also contributes to improving the quality stability and long-term storage stability of the final chemical products.

[0037] In one embodiment, the proportion of particles with a particle size ≤75μm in the liquid crystal suspension stabilizer is >90% by volume. In this embodiment, more than 90% of the particles in the liquid crystal suspension stabilizer have a particle size ≤75μm, indicating that the content of coarse particles in the liquid crystal suspension stabilizer is low, which is beneficial to further improve the network structure strength of the liquid crystal suspension stabilizer, thereby further improving the long-term suspension stability of the liquid crystal suspension stabilizer.

[0038] Preferably, the liquid crystal suspension stabilizer contains ≥95% particles with a particle size ≤75μm, based on volume content.

[0039] Preferably, the content of particles with a particle size ≤45μm in the liquid crystal suspension stabilizer is >85%. This is beneficial to further improve the network structure strength of the liquid crystal suspension stabilizer, thereby further improving the long-term suspension stability of the liquid crystal suspension stabilizer.

[0040] In one embodiment, the nonionic surfactant includes one or more of polyglycerol ester emulsifiers, cocamide MEA, cocamide methyl MEA, cocamide DEA, and alkyl glycoside surfactants with an alkyl chain length of 8-18.

[0041] The aforementioned nonionic surfactants synergistically dissolve hydrogenated castor oil with glyceryl oleate at high temperatures, further reducing the formation of large micelles in the system and resulting in a more concentrated particle size distribution.

[0042] Optionally, the polyglycerol ester emulsifier includes one or more of polyglycerol-10 laurate, polyglycerol-10 myristate, polyglycerol-10 stearate, and polyglycerol-10 oleate.

[0043] Preferably, the nonionic surfactant is composed of glyceryl oleate and polyglycerol ester emulsifier, wherein the mass ratio of glyceryl oleate to polyglycerol ester emulsifier is 1:0.25 to 1:2. Glyceryl oleate and polyglycerol ester emulsifier can better synergistically dissolve hydrogenated castor oil at high temperatures, which helps to further reduce the formation of large micelles in the system, resulting in smaller and narrower micelles, further enhancing the network structure of the system, and thus further improving the suspension performance of the liquid crystal suspension stabilizer.

[0044] More preferably, the polyglycerol ester emulsifier is polyglycerol-10 laurate.

[0045] Preferably, the liquid crystal suspension stabilizer contains 2% to 6% hydrogenated castor oil, 25% to 35% amphoteric surfactant, and 6% to 10% nonionic surfactant by mass percentage.

[0046] Preferably, the mass percentage of glyceryl oleate in the liquid crystal suspension stabilizer is 2% to 8%, which is beneficial for further improving the suspension performance of the liquid crystal suspension stabilizer. More preferably, the mass percentage of glyceryl oleate in the liquid crystal suspension stabilizer is 2% to 6%.

[0047] In one embodiment, the amphoteric surfactant is selected from one or more of cocamidopropyl betaine, sodium lauroylamphoacetate, lauryl hydroxysulfonate, lauroamide propyl betaine, lauroamide propyl hydroxysulfonate, cocoyl hydroxysulfonate, sodium cocoylamphoacetate, and disodium cocoylamphodiacetate. These amphoteric surfactants can dissolve hydrogenated castor oil in conjunction with synergistic glyceryl oleate.

[0048] Preferably, the amphoteric surfactant is selected from cocamidopropyl betaine and / or sodium lauroyl amphoteric acetate.

[0049] More preferably, the amphoteric surfactant is cocamidopropyl betaine. Cocamidopropyl betaine plays a better role in synergistically dissolving hydrogenated castor oil with glyceryl oleate at high temperatures. Moreover, in the system, cocamidopropyl betaine can provide more dispersion sites for hydrogenated castor oil, which reduces the formation of irregular crystals during subsequent cooling and crystallization of hydrogenated castor oil. This helps to enhance the strength of the three-dimensional network in the system, thereby further improving the suspension performance of the liquid crystal suspension stabilizer.

[0050] In one embodiment, the preservative includes one or both of phenoxyethanol and ethylhexylglycerin.

[0051] Accordingly, the present invention also provides a method for preparing a narrow-particle-size micron-sized liquid crystal suspension stabilizer, which includes the following steps: (1) Hydrogenated castor oil and nonionic surfactant are preheated to 85℃~90℃, completely dissolved, and kept at the temperature for a first preset time to obtain the first mixture; (2) Heat the amphoteric surfactant and water to 85℃~90℃, mix them evenly, and obtain the second mixture; (3) At 85℃~90℃, the first mixture and the second mixture are mixed and stirred at a stirring speed of N1 for a second preset time. (4) After the heat preservation and stirring in step (3) is completed, the temperature is reduced by stirring at the stirring speed of N2 until the temperature drops to 60℃~65℃; (5) At 60℃~65℃, after stirring at N3 for a third preset time, reduce the stirring speed to N4 and stir at N4 for a fourth preset time. (6) After the heat preservation and stirring in step (5) are completed, continue to cool and stir at a stirring speed of N4 until the temperature drops to 42℃~45℃. Then add the preservative and continue to cool and stir at a stirring speed of N4 until the temperature drops to 30℃~35℃ to obtain a narrow particle size distribution micron-sized liquid crystal suspension stabilizer. See Figure 13 The image shown is a physical product diagram of a liquid crystal suspension stabilizer according to an embodiment of the present invention. Where N1≥N3≥N2>N4, and N1≤1000r / min.

[0052] Traditional processes for preparing liquid crystal suspension stabilizers containing hydrogenated castor oil typically require high-speed homogenization with stirring speeds exceeding 3000 r / min, resulting in high energy consumption and production costs. This invention utilizes the synergistic effect of glyceryl oleate and other components in the liquid crystal suspension stabilizer. This allows the liquid crystal suspension stabilizer to be prepared using only a solvent method combined with low-to-medium speed shearing (≤1000 r / min), yielding a liquid crystal suspension stabilizer with fine particle size, concentrated particle size distribution, and excellent suspension performance. High-speed shearing is unnecessary. This preparation process effectively reduces production energy consumption and costs, and the resulting liquid crystal suspension stabilizer exhibits excellent dispersibility and ease of use in daily chemical products. Furthermore, the liquid crystal suspension stabilizer of this invention can also be prepared using traditional high-speed homogenization processes.

[0053] In one embodiment, N1 is 800 r / min to 1000 r / min, N2 is 300 r / min to 1000 r / min, N3 is 800 r / min to 1000 r / min, and N4 is 150 r / min to 300 r / min.

[0054] Specifically, N1 can be 800 r / min, 825 r / min, 850 r / min, 875 r / min, 900 r / min, 925 r / min, 950 r / min, 975 r / min or 1000 r / min, but is not limited to these. N2 can be 300 r / min, 350 r / min, 400 r / min, 450 r / min, 500 r / min, 550 r / min, 600 r / min, 650 r / min, 700 r / min, 750 r / min, 800 r / min, 850 r / min, 900 r / min, 950 r / min or 1000 r / min, but is not limited to these. N3 can be 800 r / min, 825 r / min, 850 r / min, 875 r / min, 900 r / min, 925 r / min, 950 r / min, 975 r / min or 1000 r / min, but is not limited to these. N4 can be 150 r / min, 180 r / min, 200 r / min, 220 r / min, 250 r / min, 280 r / min or 300 r / min, but is not limited to these.

[0055] In one implementation, in step (1), the first preset time is 3 min to 5 min; In step (3), the first preset time is 8 min to 10 min; In step (4), the cooling rate is 1.0℃ / min to 1.5℃ / min; In step (5), the second preset time is 10 min to 12 min, and the third preset time is 10 min to 12 min; In step (6), the cooling rate is 1.0℃ / min to 1.5℃ / min.

[0056] Accordingly, the present invention also provides a daily chemical product comprising the above-mentioned narrow particle size distribution micron-sized liquid crystal suspension stabilizer, wherein the amount of the narrow particle size distribution micron-sized liquid crystal suspension stabilizer added in the daily chemical product is 0.1% to 20% by mass percentage.

[0057] By adding the liquid crystal suspension stabilizer of this invention to daily chemical products, the energy storage modulus of the products can be effectively improved and the loss factor reduced. It can effectively fix high-density heavy components such as solid particles, pearl flakes and functional microcapsules in the formulation of daily chemical products, and solve the technical problems of poor suspension stability of high-density heavy components, easy sedimentation and agglomeration of particles, and easy product stratification in the traditional hydrogenated castor oil suspension system. It can maintain the uniform and stable state of the multiphase system of daily chemical products for a long time, and meet the production and use requirements of high-quality, long-shelf-life daily chemical products.

[0058] More preferably, the amount of liquid crystal suspension stabilizer added to the daily chemical product is 0.5% to 10%.

[0059] It should be noted that the daily chemical products described in this invention can be cosmetics, detergents, oral hygiene products, fragrances, insect repellents and pest control products, and other categories (such as shoe polish, floor wax, etc.). Among them, cosmetics can be beauty cosmetics, cleansing cosmetics, skin care products, hair care cosmetics, etc.; detergents can be soaps, laundry detergents, cleaning agents, etc.; oral hygiene products can be toothpaste, mouthwash, etc.

[0060] To further explain, cleansing cosmetics can include facial cleansers, facial toners, facial cleansers, facial creams, hand soaps, shampoos, hair gels, shower gels, talcum powders, etc.

[0061] In some embodiments, the daily chemical product includes one or more of shampoo, shower gel, and facial cleanser.

[0062] In one embodiment, the daily chemical product also includes a daily chemical matrix, and different daily chemical matrices can be used depending on the type of daily chemical product.

[0063] In some embodiments, the raw materials of the chemical matrix include sodium lauryl ether sulfate, cocamidopropyl betaine, Kathon, mica powder, and sodium chloride.

[0064] In some embodiments, the method for adding the liquid crystal suspension stabilizer of the present invention to daily chemical products is as follows: the liquid crystal suspension stabilizer is directly added to the daily chemical matrix, stirred at 500r / min~600r / min for 20min~40min, and after observing that there is no undispersed material, the product can be discharged.

[0065] The present invention will be further illustrated below through examples and comparative examples.

[0066] Example 1 This embodiment discloses a narrow particle size distribution micron-scale liquid crystal suspension stabilizer (hereinafter referred to as: liquid crystal suspension stabilizer), comprising the following raw materials in the following mass percentages: 4% hydrogenated castor oil, 27% amphoteric surfactant, 6% nonionic surfactant, 0.8% preservative and the balance being water; The nonionic surfactant is glyceryl oleate; the amphoteric surfactant is cocamidopropyl betaine; the preservatives include phenoxyethanol and ethylhexylglycerin, with a mass ratio of 9:1.

[0067] The preparation method of the liquid crystal suspension stabilizer in this embodiment includes the following steps: (1) The hydrogenated castor oil and nonionic surfactant are preheated to 85°C and completely dissolved. The mixture is then kept at this temperature for a first preset time (4 min) to obtain the first mixture. (2) Heat the amphoteric surfactant and water to 85°C, mix them evenly, and obtain a second mixture; (3) At 85°C, the first mixture and the second mixture are mixed and stirred at a stirring speed of N1 (800r / min) for a second preset time (8min). (4) After the heat preservation and stirring in step (3) are completed, the temperature is reduced by stirring at a stirring speed of N2 (800r / min) at a rate of 1.1℃ / min until the temperature drops to 65℃. (5) At 65℃, stir at a stirring speed of N3 (800r / min) for a third preset time (10min), then reduce the stirring speed to N4 (300r / min) and stir at a stirring speed of N4 (300r / min) for a fourth preset time (12min). (6) After the heat preservation and stirring in step (5) is completed, the temperature is reduced by stirring at a stirring speed of N4 (300r / min) at a speed of 1.5℃ / min until the temperature drops to 43℃; then the preservative is added, and the temperature is reduced by stirring at a stirring speed of N4 (300r / min) at a speed of 1.2℃ / min until the temperature drops to 30℃, thus obtaining the liquid crystal suspension stabilizer.

[0068] Specifically, the particle size distribution of the liquid crystal suspension stabilizer prepared in Example 1 was tested, and the test results are as follows: Figure 1 As shown, from Figure 1 The particle size distribution diagram shows that the particle size distribution curve of the liquid crystal suspension stabilizer in this embodiment exhibits a single main peak structure. Although a small number of trailing peaks accompany the main peak, the vast majority of particles in the system are concentrated within the particle size range corresponding to this main peak. Simultaneously, the particle size distribution of the liquid crystal suspension stabilizer shows D10 as 0.111 μm, D50 as 0.163 μm, and D90 as 9.111 μm, with a difference of 9 μm between D90 and D10, satisfying the requirements of D90-D10≤50 μm and D50≤35 μm. Furthermore, based on volume content, particles with a diameter ≤75 μm account for 100% of the liquid crystal suspension stabilizer. Therefore, the liquid crystal suspension stabilizer prepared in this embodiment has a micron-level particle size and a narrow particle size distribution, which is beneficial for improving the suspension performance of the liquid crystal suspension stabilizer.

[0069] Example 2 This embodiment provides a narrow particle size distribution micron-scale liquid crystal suspension stabilizer (hereinafter referred to as: suspension stabilizer), comprising the following raw materials by mass percentage: 4% hydrogenated castor oil, 27% amphoteric surfactant, 6% nonionic surfactant, 0.8% preservative, and the balance being water; The nonionic surfactant is composed of glyceryl oleate and polyglycerol-10 laurate. The mass percentage of glyceryl oleate in the liquid crystal suspension stabilizer is 2%, and the mass percentage of polyglycerol-10 laurate is 4%, that is, the mass ratio of glyceryl oleate to polyglycerol ester emulsifier is 1:2. The amphoteric surfactant selected is cocamidopropyl betaine; The preservatives include phenoxyethanol and ethylhexylglycerin, with a mass ratio of 9:1.

[0070] The preparation method of the liquid crystal suspension stabilizer in this embodiment is the same as that in Example 1.

[0071] Specifically, the particle size distribution of the liquid crystal suspension stabilizer prepared in Example 2 was tested, and the test results are as follows: Figure 2 As shown. From Figure 2 The particle size distribution diagram shows that the particle size distribution curve of the liquid crystal suspension stabilizer in this embodiment exhibits a single main peak structure and contains only a single peak shape, indicating a uniform particle size distribution. This eliminates the defect of separation between coarse and fine particles in terms of distribution morphology. Furthermore, the particle size distribution of the liquid crystal suspension stabilizer shows D10 as 8.146 μm, D50 as 23.48 μm, and D90 as 46.27 μm, with a difference of 38.124 μm between D90 and D10, satisfying the requirements of D90-D10≤50 μm and D50≤35 μm. Additionally, based on volume content, particles with a diameter ≤75 μm account for 98.48% of the liquid crystal suspension stabilizer. Therefore, the liquid crystal suspension stabilizer prepared in this embodiment possesses the advantages of small particle size, narrow particle size distribution, and uniform particle size distribution, which is beneficial for improving the suspension performance of the liquid crystal suspension stabilizer.

[0072] Example 3 This embodiment provides a narrow particle size distribution micron-scale liquid crystal suspension stabilizer (hereinafter referred to as: suspension stabilizer), comprising the following raw materials by mass percentage: 4% hydrogenated castor oil, 27% amphoteric surfactant, 6% nonionic surfactant, 0.8% preservative, and the balance being water; The nonionic surfactant is composed of glyceryl oleate and polyglycerol-10 laurate. The mass percentage of glyceryl oleate in the liquid crystal suspension stabilizer is 4%, and the mass percentage of polyglycerol-10 laurate is 2%, that is, the mass ratio of glyceryl oleate to polyglycerol ester emulsifier is 1:0.5. The amphoteric surfactant selected is cocamidopropyl betaine; The preservatives include phenoxyethanol and ethylhexylglycerin, with a mass ratio of 9:1.

[0073] The preparation method of the liquid crystal suspension stabilizer in this embodiment is the same as that in Example 1.

[0074] Specifically, the particle size distribution of the liquid crystal suspension stabilizer prepared in Example 3 was tested, and the test results are as follows: Figure 3 As shown, from Figure 3 The particle size distribution diagram shows that the particle size distribution curve of the intermediate liquid crystal suspension stabilizer in this embodiment exhibits a single main peak structure and contains only a single peak shape, indicating a uniform particle size distribution. This eliminates the defect of separation and differentiation between coarse and fine particles in terms of distribution morphology. Furthermore, the particle size distribution of the liquid crystal suspension stabilizer shows D10 as 4.197 μm, D50 as 14.58 μm, and D90 as 30.21 μm. The difference between D90 and D10 is 26.013 μm, satisfying the requirements of D90-D10≤50 μm and D50≤35 μm. Additionally, based on volume content, particles with a diameter ≤75 μm account for 100% of the liquid crystal suspension stabilizer. Therefore, the liquid crystal suspension stabilizer prepared in this embodiment possesses the advantages of small particle size and narrow particle size distribution, which is beneficial for improving the suspension performance of the liquid crystal suspension stabilizer.

[0075] Example 4 This embodiment provides a narrow particle size distribution micron-scale liquid crystal suspension stabilizer (hereinafter referred to as: suspension stabilizer), comprising the following raw materials by mass percentage: 4% hydrogenated castor oil, 27% amphoteric surfactant, 10% nonionic surfactant, 0.8% preservative, and the balance being water; The nonionic surfactant is composed of glyceryl oleate and polyglycerol-10 laurate. The mass percentage of glyceryl oleate in the narrow particle size distribution micron-scale liquid crystal suspension stabilizer is 8%, and the mass percentage of polyglycerol-10 laurate is 2%, that is, the mass ratio of glyceryl oleate to polyglycerol ester emulsifier is 1:0.25. The amphoteric surfactant selected is cocamidopropyl betaine; The preservatives include phenoxyethanol and ethylhexylglycerin, with a mass ratio of 9:1.

[0076] The preparation method of the liquid crystal suspension stabilizer in this embodiment is the same as that in Example 1.

[0077] Specifically, the particle size distribution of the liquid crystal suspension stabilizer prepared in Example 4 was tested, and the test results are as follows: Figure 4 As shown. From Figure 4The particle size distribution diagram shows that the particle size distribution curve of the liquid crystal suspension stabilizer in this embodiment exhibits a single main peak structure. Although a small number of trailing peaks accompany the main peak, the vast majority of particles in the system are concentrated within the particle size range corresponding to this main peak. Simultaneously, the particle size distribution of the liquid crystal suspension stabilizer shows D10 as 0.086 μm, D50 as 0.126 μm, and D90 as 15.25 μm. The difference between D90 and D10 is 15.164 μm, satisfying the requirements of D90-D10≤50 μm and D50≤35 μm. Furthermore, based on volume content, particles with a diameter ≤75 μm account for 100% of the liquid crystal suspension stabilizer. Therefore, the liquid crystal suspension stabilizer prepared in this embodiment possesses the advantages of small particle size and narrow particle size distribution, which is beneficial for improving the suspension performance of the liquid crystal suspension stabilizer.

[0078] Example 5 This embodiment provides a narrow particle size distribution micron-scale liquid crystal suspension stabilizer (hereinafter referred to as: suspension stabilizer), comprising the following raw materials by mass percentage: 4% hydrogenated castor oil, 27% amphoteric surfactant, 6% nonionic surfactant, 0.8% preservative, and the balance being water; The nonionic surfactant is composed of glyceryl oleate and polyglycerol-10 laurate. The mass percentage of glyceryl oleate in the liquid crystal suspension stabilizer is 4%, and the mass percentage of polyglycerol-10 laurate is 2%, that is, the mass ratio of glyceryl oleate to polyglycerol ester emulsifier is 1:0.5. The amphoteric surfactant selected is cocamidopropyl betaine; The preservatives include phenoxyethanol and ethylhexylglycerin, with a mass ratio of 9:1.

[0079] The preparation method of the liquid crystal suspension stabilizer in this embodiment includes the following steps; (1) The hydrogenated castor oil and nonionic surfactant are preheated to 85°C and completely dissolved. The mixture is then kept at this temperature for a first preset time (4 min) to obtain the first mixture. (2) Heat the amphoteric surfactant and water to 85°C, mix them evenly, and obtain a second mixture; (3) At 85°C, the first mixture and the second mixture are mixed and kept at a homogenization rate of N1 (3000r / min) for a second preset time (8min). (4) After the heat preservation and stirring in step (3) is completed, the temperature is reduced by stirring at a stirring speed of N2 (500r / min) at a rate of 1.1℃ / min until the temperature drops to 65℃. (5) At 65℃, after maintaining the temperature and homogenizing at a stirring speed of N3 (3000r / min) for a third preset time (10min), reduce the stirring speed to N4 (300r / min) and maintain the temperature and stirring at a stirring speed of N4 (300r / min) for a fourth preset time (12min). (6) After the heat preservation and stirring in step (5) is completed, the temperature is reduced by stirring at a stirring speed of N4 (300 r / min) at a speed of 1.5℃ / min until the temperature drops to 43℃; then the preservative is added, and the temperature is reduced by stirring at a stirring speed of N4 (300 r / min) at a speed of 1.2℃ / min until the temperature drops to 30℃, thus obtaining the liquid crystal suspension stabilizer; Specifically, the particle size distribution of the liquid crystal suspension stabilizer prepared in Example 5 was tested, and the test results are as follows: Figure 5 As shown, from Figure 5 The particle size distribution diagram shows that the particle size distribution curve of the liquid crystal suspension stabilizer in this embodiment exhibits a single main peak structure and contains only a single peak shape. Simultaneously, the particle size distribution of the liquid crystal suspension stabilizer shows D10 as 6.027 μm, D50 as 18.13 μm, and D90 as 33.26 μm, with a difference of 27.233 μm between D90 and D10, satisfying the requirements of D90-D10≤50 μm and D50≤35 μm. Furthermore, based on volume content, particles with a diameter ≤75 μm account for 100% of the liquid crystal suspension stabilizer. Therefore, the liquid crystal suspension stabilizer prepared in this embodiment possesses the advantages of small particle size and narrow particle size distribution, which is beneficial for improving the suspension performance of the liquid crystal suspension stabilizer.

[0080] Furthermore, Examples 1-4 were prepared using a low-to-medium speed stirring method, while Example 5 was prepared using a homogenization method. As can be seen from the particle size distribution diagrams of Examples 1-5, the solvent method combined with low-to-medium speed stirring in Examples 1-4 yielded liquid crystal suspension stabilizers with small particle sizes and concentrated particle size distributions. Some of these results were even better than those achieved through homogenization in Example 5. Therefore, through the synergistic effect of the components in the liquid crystal suspension stabilizer of this invention, the liquid crystal suspension stabilizer can be prepared solely through a solvent method combined with low-to-medium speed shearing (≤1000 r / min), eliminating the need for high-speed homogenization and thus reducing production costs and energy consumption.

[0081] Comparative Example 1 This comparative example is a commercially available suspension stabilizer containing 4% hydrogenated castor oil.

[0082] Specifically, the particle size distribution of the suspension stabilizer in Comparative Example 1 was tested, and the results are as follows: Figure 6 As shown, from Figure 6The particle size distribution diagram shows that in Comparative Example 1, the particle size distribution of the suspension stabilizer has D10 of 0.062 μm, D50 of 12.79 μm, and D90 of 35.98 μm, with a difference of 33.9183 μm between D90 and D10. Furthermore, by volume, particles with a diameter ≤75 μm account for 100% of the suspension stabilizer. Although the particle size distribution of Comparative Example 1 also meets the requirements of D90-D10≤50 μm and D50≤35 μm, the particle size distribution curve of Comparative Example 1 exhibits a double-peak structure, meaning there are two independent peaks in the curve: one in the ultrafine nanoparticle range and the other in the large particle range. The large accumulation of both ultrafine and large particles, and the extreme separation between particle size, will significantly reduce the suspension performance of the suspension stabilizer.

[0083] Comparative Example 2 This comparative example is a commercially available suspension stabilizer containing 8% hydrogenated castor oil.

[0084] Specifically, the particle size distribution of the suspension stabilizer in Comparative Example 2 was tested, and the results are as follows: Figure 7 As shown, from Figure 7 The particle size distribution diagram shows that in Comparative Example 2, the suspension stabilizer has a particle size distribution of D10 of 0.072 μm, D50 of 10.37 μm, and D90 of 40.76 μm, with a difference of 40.688 μm between D90 and D10. Furthermore, by volume, particles with a diameter ≤75 μm account for 98.35% of the suspension stabilizer. Although the particle size distribution of Comparative Example 2 also meets the requirements of D90-D10≤50 μm and D50≤35 μm, the particle size distribution curve of Comparative Example 1 exhibits a double-peak structure, meaning there are two independent peaks in the curve. One peak is in the ultrafine nanoparticle range, and the other is in the large particle range. The large accumulation of ultrafine and large particles, and the extreme separation between particle size, leads to a significant decrease in the suspension performance of the suspension stabilizer.

[0085] Comparative Example 3 This comparative example is a commercially available suspension stabilizer containing 15% hydrogenated castor oil.

[0086] Specifically, the particle size distribution of the suspension stabilizer in Comparative Example 3 was tested, and the results are as follows: Figure 8 As shown, from Figure 8The particle size distribution diagram shows that although the particle size distribution curve of the suspension stabilizer in Comparative Example 3 exhibits a single main peak structure and contains only a single peak shape, the particle size distribution of the suspension stabilizer in Comparative Example 3 shows that D10 is 12.07 μm, D50 is 44.33 μm, and D90 is 130.1 μm. The difference between D90 and D10 is 118.03 μm, meaning that the D90-D10 of the suspension stabilizer in Comparative Example 3 is much greater than 50 μm, and D50 is also greater than 35 μm. Furthermore, based on volume content, particles with a diameter ≤75 μm account for 72.02% of the suspension stabilizer. It is evident that the main peak of the suspension stabilizer in Comparative Example 3 is generally biased towards the large particle size range, indicating a large particle size and wide particle size distribution, which will lead to a significant decrease in the suspension performance of the suspension stabilizer.

[0087] Comparative Example 4 This comparative example provides a suspension stabilizer comprising the following raw materials in weight percentages: 4% hydrogenated castor oil, 27% amphoteric surfactant, 0.8% preservative, and the balance being water, i.e., Comparative Example 4 does not contain nonionic surfactants.

[0088] Among them, the amphoteric surfactant selected is cocamidopropyl betaine; The preservatives include phenoxyethanol and ethylhexylglycerin, with a mass ratio of 9:1.

[0089] The preparation method of the suspension stabilizer in this embodiment is basically the same as that in Example 1, except that: In step (1), hydrogenated castor oil is preheated to 85°C, completely dissolved, and kept at that temperature for a first preset time (4 min) to obtain the first liquid; In step (3), the first liquid and the second mixture are mixed at 85°C.

[0090] Specifically, the particle size distribution of the suspension stabilizer in Comparative Example 4 was tested, and the results are as follows: Figure 9 As shown, from Figure 9 The particle size distribution diagram shows that although the particle size distribution curve of the suspension stabilizer in Comparative Example 4 exhibits a single main peak structure and contains only a single peak shape, the particle size distribution of the suspension stabilizer in Comparative Example 4 shows that D10 is 12.28 μm, D50 is 36.40 μm, and D90 is 77.37 μm. The difference between D90 and D10 is 65.09 μm, meaning that the D90-D10 of the suspension stabilizer in Comparative Example 3 is greater than 50 μm, and D50 is also greater than 35 μm. Furthermore, based on volume content, particles with a diameter ≤75 μm account for 89.05% of the suspension stabilizer. It is evident that the main peak of the suspension stabilizer in Comparative Example 3 is generally biased towards the large particle size range, indicating a large particle size and a wide particle size distribution, which will significantly reduce the suspension performance of the suspension stabilizer.

[0091] Comparative Example 5 This comparative example provides a suspension stabilizer comprising the following raw materials in weight percentages: 4% hydrogenated castor oil, 27% amphoteric surfactant, 6% nonionic surfactant, 0.8% preservative, and the balance being water.

[0092] Among them, the nonionic surfactant is polyglycerol-10 laurate, that is, the nonionic surfactant does not include glycerol oleate. The amphoteric surfactant selected is cocamidopropyl betaine; The preservatives include phenoxyethanol and ethylhexylglycerin, with a mass ratio of 9:1.

[0093] The preparation method of the suspension stabilizer in this embodiment is the same as that in Example 1.

[0094] Specifically, the particle size distribution of the suspension stabilizer in Comparative Example 5 was tested, and the results are as follows: Figure 10 As shown, from Figure 10 The particle size distribution diagram shows that the suspension stabilizer of Comparative Example 5 exhibits a single main peak structure. The particle size distribution shows D10 at 9.249 μm, D50 at 23.91 μm, and D90 at 41.56 μm, with a difference of 32.314 μm between D90 and D10. Furthermore, based on volume content, particles with a diameter ≤75 μm account for 99.94% of the suspension stabilizer. It is evident that the suspension stabilizer of Comparative Example 5 also exhibits a single main peak structure, with small particle size and a relatively concentrated particle size distribution. However, from... Figure 11 and Figure 12 The test results of energy storage modulus and loss factor show that the energy storage modulus of the daily chemical product prepared using the suspension stabilizer of Comparative Example 5 is lower than that of the daily chemical products prepared using the liquid crystal suspension stabilizers of Examples 1-5, and the loss factor is higher. This leads to the daily chemical product prepared using the suspension stabilizer of Comparative Example 5 exhibiting stratification or precipitation problems in the first month of stability testing, resulting in the failure of the first month's stability test. The reason for this may be that glyceryl oleate can drive the crystallization of hydrogenated castor oil and participate in the crystal formation process, causing the crystals to grow into fibrous and flower-like crystal morphologies. However, the suspension stabilizer of Comparative Example 5 does not contain glyceryl oleate, resulting in fewer fibrous and flower-like crystals formed in the suspension stabilizer of Comparative Example 5, and mainly forming irregular crystals. This significantly reduces the strength of the three-dimensional network structure of the suspension stabilizer, thus leading to a significant decrease in suspension stability.

[0095] Application Example 1 The suspension stabilizers of Examples 1-5 and Comparative Examples 1-5 were added to the daily chemical matrix to prepare 10 groups of daily chemical products. The amount of suspension stabilizer added to each daily chemical product was 1.25% by mass. The raw materials of the daily chemical matrix in the daily chemical products of this application example include sodium lauryl ether sulfate, cocamidopropyl betaine, Kathon, mica powder, sodium chloride, and deionized water. Specifically, the content of each component in the daily chemical product by mass percentage is as follows: suspension stabilizer 1.25%, sodium lauryl ether sulfate 10.5%, cocamidopropyl betaine 2.3%, Kathon 0.08%, mica powder 0.1%, sodium chloride 2%, and the balance deionized water.

[0096] The preparation method of daily chemical products includes the following steps: the suspension stabilizer is directly added to the daily chemical matrix, stirred at 600 r / min for 30 min, and the product is discharged when no undispersed material is observed.

[0097] Meanwhile, a daily chemical product prepared using only the above-mentioned daily chemical matrix was used as a blank control sample, and no suspension stabilizer was added to the blank control sample.

[0098] Performance testing: (1) The daily chemical products prepared using the suspension stabilizers of Examples 1 to 5 and Comparative Examples 1 to 5 above, and the blank control samples were placed in an oven at 45°C. The stability of the daily chemical products after being placed at 45°C for 1 month, 2 months, and 3 months was observed visually. If no precipitation or stratification occurred, it was recorded as "pass"; if precipitation or stratification occurred, it was recorded as "fail". The test results are shown in Table 1 below: Table 1 Performance Test Results

[0099] As shown in Table 1, the daily chemical products prepared using the liquid crystal suspension stabilizers of Examples 1, 2, 3, 4, and 5 did not exhibit precipitation or stratification after being placed at 45°C for 2 months, demonstrating good stability. Furthermore, the liquid crystal suspension stabilizers of Examples 1, 2, 3, and 5 exhibited superior suspension stability, showing no precipitation or stratification after being placed at 45°C for 3 months. The daily chemical product prepared using the liquid crystal suspension stabilizer of Example 4 still showed good stability after being placed at 45°C for 2 months, but failed the stability test after 3 months. The reason for this may be that the liquid crystal suspension stabilizer of Example 4 had a high content of glyceryl oleate. Glyceryl oleate is a nonionic surfactant with a cloud point at high temperatures. Under high-temperature conditions, the high content of glyceryl oleate itself also needs to be suspended, affecting the suspension network structure of the suspension stabilizer and thus its suspension performance.

[0100] Meanwhile, as shown in Table 1, the stability test results indicate that the daily chemical products prepared using the blank control sample and the suspension stabilizers of Comparative Examples 1, 2, and 4 exhibited stratification or precipitation after one month at 45°C, resulting in failure to pass the stability test. While the daily chemical products prepared using the suspension stabilizers of Comparative Examples 3 and 5 passed the stability test after one month at 45°C, they failed the stability test after two months at 45°C. This demonstrates that although the suspension stabilizer in Comparative Example 3 uses a high content of hydrogenated castor oil (15%), its suspension stability is still poor, making it difficult to maintain a long-lasting and uniform suspension stability effect in the daily chemical products. Furthermore, in Comparative Example 5, the nonionic surfactant used only polyglycerol-10 laurate, instead of glyceryl oleate, also significantly reduces the suspension stability of the suspension stabilizer, making it difficult to maintain a long-lasting and uniform suspension stability effect in the daily chemical products.

[0101] (2) The energy storage modulus and loss factor of the daily chemical products prepared using the suspension stabilizers of Examples 1 to 5 and Comparative Examples 1 to 5 were tested. The test results are shown in [reference]. Figure 11 and Figure 12 As shown.

[0102] from Figure 11 and Figure 12 It can be seen that, compared with the daily chemical products prepared using the suspension stabilizers of Comparative Examples 1 to 5, the daily chemical products prepared using the liquid crystal suspension stabilizers of Examples 1 to 5 have higher energy storage modulus and lower loss factor, which is beneficial to achieving long-lasting and uniform suspension stabilization effect in daily chemical products.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A narrow particle size distribution micron-scale liquid crystal suspension stabilizer, characterized in that, The raw materials include the following percentages by weight: 2% to 10% hydrogenated castor oil, 10% to 40% amphoteric surfactant, 0.1% to 10% nonionic surfactant, 0.2% to 1% preservative, and the balance being water; The nonionic surfactant includes at least glyceryl oleate; The particle size distribution curve of the narrow-particle-size micron-sized liquid crystal suspension stabilizer exhibits a single main peak structure.

2. The narrow particle size distribution micron-scale liquid crystal suspension stabilizer according to claim 1, characterized in that, The particle size distribution of the narrow particle size distribution micron-sized liquid crystal suspension stabilizer satisfies: D90-D10≤50μm and D50≤35μm.

3. The narrow particle size distribution micron-scale liquid crystal suspension stabilizer according to claim 2, characterized in that, The particle size distribution of the narrow-particle-size micron-sized liquid crystal suspension stabilizer satisfies: D10 ranges from 0.01 μm to 10 μm, D50 ranges from 0.1 μm to 30 μm, and D90 ranges from 8 μm to 50 μm.

4. The narrow particle size distribution micron-scale liquid crystal suspension stabilizer according to claim 1, characterized in that, By volume content, the proportion of particles with a diameter ≤75μm in the narrow particle size distribution micron-sized liquid crystal suspension stabilizer is >90%.

5. The narrow particle size distribution micron-scale liquid crystal suspension stabilizer according to claim 1, characterized in that, The nonionic surfactant also includes one or more of the following: polyglycerol ester emulsifiers, cocamide MEA, cocamide methyl MEA, cocamide DEA, and alkyl glycoside surfactants with an alkyl chain length of 8-18. The amphoteric surfactant is selected from one or more of the following: cocamidopropyl betaine, sodium lauroyl amphoteric acetate, lauroyl hydroxysulfonate, lauroamide propyl betaine, lauroamide propyl hydroxysulfonate, cocamidopropyl hydroxysulfonate, sodium cocamidopropyl acetate, and disodium cocamidopropyl diacetate. The preservatives include one or both of phenoxyethanol and ethylhexylglycerin.

6. The narrow particle size distribution micron-scale liquid crystal suspension stabilizer according to claim 5, characterized in that, The nonionic surfactant is composed of glyceryl oleate and polyglycerol ester emulsifiers; The mass ratio of the glyceryl oleate to the polyglycerol ester emulsifier is 1:0.25 to 1:2; The polyglycerol ester emulsifiers include one or more of polyglycerol-10 lauryl ester, polyglycerol-10 myristate ester, polyglycerol-10 stearate, and polyglycerol-10 oleate. The amphoteric surfactant is selected from cocamidopropyl betaine and / or sodium lauroyl amphoteric acetate.

7. The narrow particle size distribution micron-scale liquid crystal suspension stabilizer according to claim 6, characterized in that, The glyceryl oleate content in the narrow particle size distribution micron-sized liquid crystal suspension stabilizer is 2%~6% by mass.

8. A method for preparing a narrow-particle-size micron-sized liquid crystal suspension stabilizer, characterized in that, The preparation of the narrow particle size distribution micron-scale liquid crystal suspension stabilizer according to any one of claims 1-7 comprises the following steps: (1) Hydrogenated castor oil and nonionic surfactant are preheated to 85℃~90℃, completely dissolved, and kept at the temperature for a first preset time to obtain the first mixture; (2) Heat the amphoteric surfactant and water to 85℃~90℃, mix them evenly, and obtain the second mixture; (3) At 85℃~90℃, the first mixture and the second mixture are mixed and stirred at a stirring speed of N1 for a second preset time. (4) After the heat preservation and stirring in step (3) is completed, the temperature is reduced by stirring at the stirring speed of N2 until the temperature drops to 60℃~65℃; (5) At 60℃~65℃, after stirring at N3 for a third preset time, reduce the stirring speed to N4 and stir at N4 for a fourth preset time. (6) After the heat preservation and stirring in step (5) is completed, continue to cool and stir at the stirring speed of N4 until the temperature drops to 42℃~45℃; then add the preservative and continue to cool and stir at the stirring speed of N4 until the temperature drops to 30℃~35℃ to obtain a narrow particle size distribution micron-sized liquid crystal suspension stabilizer. Where N1≥N3≥N2>N4, and N1≤1000r / min.

9. The method for preparing the narrow particle size distribution micron-sized liquid crystal suspension stabilizer according to claim 8, characterized in that, N1 is 800 r / min to 1000 r / min, N2 is 300 r / min to 1000 r / min, N3 is 800 r / min to 1000 r / min, and N4 is 150 r / min to 300 r / min; and / or, In step (1), the first preset time is 3 min to 5 min; In step (3), the second preset time is 8 min to 10 min; In step (4), the cooling rate is 1.0℃ / min to 1.5℃ / min; In step (5), the third preset time is 10 min to 12 min, and the fourth preset time is 10 min to 12 min; In step (6), the cooling rate is 1.0℃ / min to 1.5℃ / min.

10. A daily chemical product, characterized in that, The narrow particle size distribution micron-sized liquid crystal suspension stabilizer according to any one of claims 1-7 is added in the daily chemical product at a rate of 0.1% to 20% by mass percentage.

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