Moisture-proof water-soluble laundry detergent and preparation method thereof

Abstract

The application provides a moisture-proof water-soluble laundry detergent and a preparation method thereof, and belongs to the technical field of daily chemical industry. The laundry detergent adopts a shell-core structure design and is composed of a core fast-dissolving component, a shell moisture-proof component and a functional additive. The core fast-dissolving component comprises a surfactant, a porous fast-dissolving material and a water-solubility aid, wherein the surfactant is composed of sodium fatty alcohol polyoxyethylene ether sulfate, cocamidopropyl betaine and alpha-sulfo fatty acid methyl ester sodium salt; the shell moisture-proof component takes the compounding of amodimethicone and fatty alcohol polyoxyethylene ether-3 as a core moisture-proof material, and is matched with a shell layer regulator and an anti-caking agent to form a uniform film and efficiently block water vapor. The product has low moisture absorption rate, strong anti-caking property and fast cold water dissolution in a high-humidity environment, has strong decontamination performance on three types of contaminated cloths including carbon black, protein and sebum, has the advantages of long-term moisture-proof, cold water fast dissolution and high-efficiency decontamination, and is suitable for household and industrial washing scenes.

Description

Technical Field

[0001] This invention relates to the field of daily chemical technology, specifically to a moisture-proof water-soluble laundry detergent and its preparation method. Background Technology

[0002] Laundry detergent, as a core product in the daily washing industry, is widely used in both household and industrial washing scenarios. However, traditional laundry detergent suffers from the problem of not being able to simultaneously achieve moisture resistance and quick dissolution in cold water, becoming a key factor restricting product upgrades. Due to defects in its formula and structural design, traditional laundry detergent granules are extremely prone to absorbing moisture and clumping in high-humidity environments, leading to decreased product flowability and poor storage stability. This not only affects usability but also reduces washing efficiency due to ingredient aggregation. In high-humidity areas, clumping and spoilage can further cause product loss and damage to brand reputation.

[0003] To address these issues, existing technologies often employ methods such as adding desiccant, densification treatment, or coating processes to enhance the moisture-proof performance of laundry detergent. For example, increasing particle density or coating with hydrophobic materials attempts to prevent moisture penetration. However, while these methods improve moisture resistance in the short term, they often introduce new problems: firstly, excessively dense particles or overly thick coatings significantly reduce their dissolution rate in cold water, resulting in residues; secondly, the delayed release of active ingredients such as surfactants and enzymes affects washing efficiency. Therefore, existing moisture-proof technologies struggle to achieve a good balance between moisture resistance and rapid dissolution.

[0004] Currently, there is no mature technical solution in the industry that can simultaneously achieve anti-caking in high humidity environments, rapid and residue-free dissolution in cold water, and efficient release of active ingredients. Developing a laundry detergent that balances storage stability and cold water performance has become an urgent need in the daily chemical washing industry. Summary of the Invention

[0005] The purpose of this invention is to provide a moisture-proof water-soluble laundry detergent and its preparation method. The laundry detergent provided by this invention is not only moisture-proof, but also dissolves quickly in cold water.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a moisture-proof water-soluble laundry detergent, composed of a core quick-dissolving component, an outer shell moisture-proof component, and functional additives in a weight ratio of (70-85):(12-25):(1-5). The core quick-dissolving component includes the following raw materials by weight: 13-28 parts of surfactant, 36-60 parts of porous quick-dissolving material, and 5-13 parts of water-soluble additives. The surfactant is composed of sodium fatty alcohol polyoxyethylene ether sulfate, cocamidopropyl betaine, and sodium α-sulfonyl fatty acid methyl ester in a weight ratio of (8-15):(2-5):(3-8). The outer shell moisture-proof component includes the following raw materials by weight: 5-12 parts of moisture-proof material, 2-7 parts of shell layer regulator, and 0.5-2 parts of anti-caking agent. The moisture-proof material is composed of amino-terminated polydimethylsiloxane and fatty alcohol polyoxyethylene ether-3 in a weight ratio of (3-7):(2-5).

[0007] Preferably, the porous quick-dissolving material is composed of sodium sulfate, zeolite and polyethylene glycol-polyvinyl alcohol graft copolymer in a weight ratio of (30-45):(5-12):(1-3).

[0008] Preferably, the water-soluble additive is at least one of anhydrous sodium citrate and sodium disilicate.

[0009] Preferably, the functional additive is at least one of whitening agent, compound enzyme granules, and fragrance.

[0010] Preferably, the shell regulator is at least one of glyceryl monostearate and silicon dioxide.

[0011] Preferably, the anti-caking agent comprises hydroxypropyl starch.

[0012] The present invention also provides a method for preparing the above-mentioned moisture-proof water-soluble laundry detergent, comprising: mixing a porous quick-dissolving material, a water-soluble additive, and a surfactant, granulating, and drying to obtain porous core particles; mixing a moisture-proof material, a shell layer regulator, an anti-caking agent, and water to obtain a coating dispersion; spraying the coating dispersion onto the surface of the porous core particles using high-pressure atomization, gradient cooling to obtain a preliminary product, and mixing it with functional additives to obtain a moisture-proof water-soluble laundry detergent.

[0013] Preferably, the preparation method of the coating dispersion includes: mixing a moisture-proof material, a shell conditioner, and an anti-caking agent with water, and stirring at 60-65°C to obtain a coating dispersion.

[0014] Preferably, the atomization pressure of the high-pressure atomization spraying is 0.3-0.5MPa, the spraying speed is 1-1.5kg / h, and the spraying time is 20-30min.

[0015] Preferably, the gradient cooling includes: reducing the inlet air temperature from 45°C to 25°C at a cooling rate of 5°C / 10min, and a setting time of 20-30min.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a moisture-proof water-soluble laundry detergent, composed of a core quick-dissolving component, an outer moisture-proof component, and functional additives. The core quick-dissolving component includes: a surfactant, a porous quick-dissolving material, and water-soluble additives; the surfactant is composed of sodium fatty alcohol polyoxyethylene ether sulfate, cocamidopropyl betaine, and sodium α-sulfonyl fatty acid methyl ester; the outer moisture-proof component includes: a moisture-proof material, a shell layer regulator, and an anti-caking agent; the moisture-proof material is composed of amino-terminated polydimethylsiloxane and fatty alcohol polyoxyethylene ether-3. First, the core raw materials are mixed and granulated to obtain porous core particles. Then, the moisture-proof component is prepared into a coated dispersion, which is sprayed onto the core surface through high-pressure atomization, and then cooled and shaped by gradient cooling. Finally, it is mixed with functional additives to obtain the laundry detergent.

[0017] This invention achieves a synergistic improvement in moisture resistance and rapid solubility in cold water through core-shell structure design and component optimization. The hydrophobic outer shell effectively blocks moisture intrusion, significantly improving moisture resistance in high-humidity environments; the porous core structure, combined with fast-dissolving surfactants, ensures rapid disintegration in cold water. Simultaneously, the compounded surfactants impart excellent detergency to the laundry powder, demonstrating highly effective cleaning capabilities against carbon black oil stains, protein stains, and sebum stains. This laundry powder combines good storage stability with ease of use, making it suitable for both household and industrial washing applications. Detailed Implementation

[0018] This invention provides a moisture-proof water-soluble laundry detergent, composed of a core quick-dissolving component, an outer shell moisture-proof component, and functional additives in a weight ratio of (70-85):(12-25):(1-5). The core quick-dissolving component includes the following raw materials by weight: 13-28 parts of surfactant, 36-60 parts of porous quick-dissolving material, and 5-13 parts of water-soluble additives. The surfactant is composed of sodium fatty alcohol polyoxyethylene ether sulfate, cocamidopropyl betaine, and sodium α-sulfonyl fatty acid methyl ester in a weight ratio of (8-15):(2-5):(3-8). The outer shell moisture-proof component includes the following raw materials by weight: 5-12 parts of moisture-proof material, 2-7 parts of shell layer regulator, and 0.5-2 parts of anti-caking agent. The moisture-proof material is composed of amino-terminated polydimethylsiloxane and fatty alcohol polyoxyethylene ether-3 in a weight ratio of (3-7):(2-5).

[0019] Surfactants are the core cleaning components of this invention's moisture-proof water-soluble laundry detergent. The three components work together to achieve cleaning, emulsifying, and dispersing effects. Sodium fatty alcohol polyoxyethylene ether sulfate, as an anionic surfactant, possesses extremely strong detergency and emulsifying capabilities. It can quickly penetrate between stains and clothing fibers, disrupting the stain's adhesion and breaking down grease, dust, and other stains into tiny particles for easy rinsing. It also exhibits excellent hard water resistance, maintaining stable cleaning performance in various water qualities. Cocamidopropyl betaine, as an amphoteric surfactant, not only enhances cleaning power but also significantly improves the feel of the clothes after washing, reducing the tightness. It also has good foaming and foam-stabilizing effects, resulting in uniform and delicate foam during washing, improving the user experience. Sodium α-sulfofatty acid methyl ester, as a high-performance anionic surfactant, effectively improves the dissolution rate and cleaning effect of the laundry detergent in cold water, compensating for the insufficient low-temperature cleaning ability of traditional surfactants. Simultaneously, it works synergistically with the other two surfactants to enhance the overall system stability, preventing stratification and sedimentation.

[0020] Moisture-proof material is the core of the outer moisture-proof component. Its main function is to form a hydrophobic coating on the surface of the core particles, blocking external moisture from penetrating and improving the moisture-proof performance of the laundry detergent without affecting the quick-dissolving performance of the core. Amino-terminated polydimethylsiloxane, as the core hydrophobic film-forming component, has amino groups in its molecular structure that enhance adhesion to the core particles, forming a hydrophobic coating that effectively blocks external moisture and improves moisture-proof and anti-caking performance. AEO-3 ensures that the coating evenly covers the core surface, while also optimizing the coating's solubility to prevent it from hindering the quick dissolving of the core. It also improves the coating's flexibility, preventing it from falling off during storage and transportation. The two work synergistically to achieve strong moisture resistance, rapid dissolution, and a stable coating, further enhancing the overall performance of the laundry detergent.

[0021] The porous, fast-dissolving material of the present invention is preferably composed of sodium sulfate, zeolite and polyethylene glycol-polyvinyl alcohol graft copolymer in a weight ratio of (30-45):(5-12):(1-3), and the weight ratio is more preferably 37.5:8.5:2.

[0022] Porous, fast-dissolving materials are the core components for constructing the highly porous core structure and ensuring the fast-dissolving performance of laundry detergent. They provide a stable porous framework for the core, rapidly absorb water and dissolve, accelerating the disintegration of core particles. They also assist in carrying surfactants, improving the dispersibility of detergency ingredients. Zeolite, as a calcium ion exchanger, effectively adsorbs calcium and magnesium ions in water, softening hard water and preventing hard water ions from combining with surfactants to form precipitates, thereby improving the detergency of surfactants. Simultaneously, it enhances the mechanical strength of the core particles, preventing particle breakage during granulation and ensuring the effective core formation. Polyethylene glycol-polyvinyl alcohol graft copolymers possess both good water solubility and pore-forming properties. They can synergistically construct a dense and interconnected pore network with sodium sulfate and zeolite, further enhancing the fast-dissolving performance of the core. They also have a certain binding effect, assisting in core particle formation and ensuring the uniformity and stability of granulated particles without affecting subsequent coating treatments.

[0023] The water-soluble additives described in this invention are preferably at least one of anhydrous sodium citrate and sodium disilicate, and more preferably anhydrous sodium citrate and sodium disilicate.

[0024] Water-soluble additives, as auxiliary components, can improve the water solubility of laundry detergent, soften water, assist in moisture resistance, and enhance the synergistic effect of detergency. Anhydrous sodium citrate can efficiently chelate metal ions in water. When combined with zeolite, it improves water softening, avoids the impact of hard water on detergency, and has a certain buffering effect, keeping surfactants in optimal active state. In addition, it can inhibit the moisture absorption of the core components, further enhancing moisture resistance. Sodium disilicate has a good alkaline buffering effect, maintaining a slightly alkaline environment in the washing system, enhancing the detergency of surfactants, and has excellent anti-caking properties, preventing core particles from sticking together during storage. When combined with anhydrous sodium citrate, it further improves the moisture resistance stability of the core.

[0025] The functional additives described in this invention are preferably at least one of whitening agents, compound enzyme granules, and fragrances.

[0026] The shell regulator of the present invention is preferably at least one of glyceryl monostearate and silicon dioxide, more preferably glyceryl monostearate and silicon dioxide.

[0027] The anti-caking agent of the present invention preferably includes hydroxypropyl starch.

[0028] The present invention also provides a method for preparing the above-mentioned moisture-proof water-soluble laundry detergent, comprising: mixing a porous quick-dissolving material, a water-soluble additive, and a surfactant, granulating, and drying to obtain porous core particles; mixing a moisture-proof material, a shell layer regulator, an anti-caking agent, and water to obtain a coating dispersion; spraying the coating dispersion onto the surface of the porous core particles using high-pressure atomization, gradient cooling to obtain a preliminary product, and mixing it with functional additives to obtain a moisture-proof water-soluble laundry detergent.

[0029] The preparation method of the coating dispersion of the present invention includes: mixing moisture-proof material, shell conditioner and anti-caking agent with water, stirring at 60-65°C to obtain coating dispersion.

[0030] The high-pressure atomization spraying of the present invention has an atomization pressure of 0.3-0.5MPa, a spraying speed of 1-1.5kg / h, and a spraying time of 20-30min.

[0031] The gradient cooling described in this invention includes: reducing the inlet air temperature from 45°C to 25°C at a cooling rate of 5°C / 10 min, and a setting time of 20-30 min.

[0032] The preparation method of this invention can achieve the dual functions of quick dissolution of the laundry detergent core and moisture-proof shell. By preparing the core particles and the coating dispersion in steps, and then using high-pressure atomization spraying and gradient cooling to solidify, the moisture-proof components of the shell are uniformly coated on the core, forming a dense hydrophobic film to block water vapor and prevent particle agglomeration, without hindering the quick dissolution performance of the core.

[0033] This invention provides a laundry detergent that achieves highly efficient stain removal, rapid dissolution, and long-lasting moisture protection, meeting the needs of daily clothing washing while offering a good user experience and storage stability. The invention utilizes a core-shell structure design; the outer shell forms a dense hydrophobic film that effectively blocks moisture intrusion, preventing granule clumping and moisture absorption, thus extending shelf life. The porous core, combined with fast-dissolving components, dissolves quickly and residue-free in cold water, enhancing washing convenience. The compounded surfactants and complex enzyme particles efficiently decompose various stains; all components are compatible and non-antagonistic, balancing gentleness and practicality.

[0034] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0035] Unless otherwise specified, the following embodiments are all conventional methods.

[0036] Unless otherwise specified, all materials and reagents used in the following examples are commercially available.

[0037] Sodium fatty alcohol polyoxyethylene ether sulfate, sourced from Shenzhen Qiaochuang Technology Co., Ltd., item number QC-YC0083; Cocamidopropyl betaine, sourced from Guangzhou Fufeng Chemical Technology Co., Ltd., model CAB-35; Sodium α-sulfonyl fatty acid methyl ester, brand Taike KLK, item number MES; Sodium sulfate, sourced from Weifang Yuanxue Chemical Co., Ltd., item number 004860; Zeolite, sourced from Jiangxi Xintao Technology Co., Ltd., specification 4A molecular sieve; Polyethylene glycol-polyvinyl alcohol graft copolymer, sourced from Shanghai Maclean Biochemical Technology Co., Ltd., CAS number 96734-39-3, item number M983166; Ammonia-terminated polydimethylsiloxane, sourced from Guangdong Zhong Kehongtai New Materials Co., Ltd., model CN-266; fatty alcohol polyoxyethylene ether-3, sourced from Shandong Jinyusheng Chemical Technology Co., Ltd., model AEO-3; glyceryl monostearate, sourced from Wuhan Hongdeyuexin Pharmaceutical Technology Co., Ltd., CAS No. 123-94-4; hydroxypropyl starch, sourced from Qingdao Haiweisen Biotechnology Co., Ltd., model 01123; brightener is fluorescent whitening agent CBS-X, sourced from Chengdu Jinran Chemical Co., Ltd.; compound enzyme granules are three-in-one compound enzyme granules GDX30, sourced from Ningxia Xiasheng Industrial Group Co., Ltd., item number GFG-3317; fragrance is bluebell powder fragrance, sourced from Shandong Lanying Fragrance Co., Ltd.

[0038] Example 1 (1) Weighing Weigh accurately according to the weight percentage: Core instant-dissolving components: 20.5 parts surfactant (11.5 parts sodium fatty alcohol polyoxyethylene ether sulfate, 3.5 parts cocamidopropyl betaine, 5.5 parts sodium α-sulfonyl fatty acid methyl ester), 48 parts porous instant-dissolving material (37.5 parts sodium sulfate, 8.5 parts zeolite, 2 parts polyethylene glycol-polyvinyl alcohol graft copolymer), 9.5 parts water-soluble additives (5.5 parts anhydrous sodium citrate, 4 parts sodium disilicate); The outer shell moisture-proof components are: 8.5 parts moisture-proof material (5 parts ammonia-terminated polydimethylsiloxane, 33.5 parts fatty alcohol polyoxyethylene ether-3), 4.5 parts shell conditioner (2 parts glyceryl monostearate, 2.5 parts silica), and 1.2 parts anti-caking agent (1.2 parts hydroxypropyl starch). Functional additives: 0.2 parts whitening agent, 1.2 parts compound enzyme granules, and 0.5 parts fragrance.

[0039] (2) Preparation of porous core particles The porous, readily soluble material and water-soluble additive were mixed and dried at 85°C to a moisture content of 0.47 wt%. After cooling to 25°C, a surfactant was added, and 6.5% by weight of deionized water of the readily soluble core component was sprayed on. The mixture was then fed into a high-shear granulator, with the rotation speed controlled at 1350 r / min and the temperature at 42.5°C. Granulation was carried out for 22.5 min, and the mixture was dried at 52.5°C to a moisture content of 0.25 wt% to obtain porous core particles.

[0040] (3) Preparation of coated dispersion Moisture-proof material, shell conditioner, and anti-caking agent were added to deionized water and stirred at 62.5℃ and 700r / min for 35min to obtain a coating dispersion with a solid mass fraction of 27.5%.

[0041] (4) Coating and shaping Porous core particles are fed into a low-temperature fluidized bed, with the inlet air temperature controlled at 50℃, the outlet air temperature at 37.5℃, and the air velocity at 1.35m / s. The coating dispersion is sprayed using high-pressure atomization at a pressure of 0.4MPa and a spraying speed of 1.25kg / h for 25 minutes. Gradient cooling is then performed to reduce the inlet air temperature from 45℃ to 25℃ at a cooling rate of 5℃ / 10min, followed by a setting time of 25 minutes to obtain the initial product.

[0042] (5) Finished product preparation The initial product and functional additives are placed in a mixer and stirred at 350 rpm for 12.5 minutes to obtain a moisture-proof water-soluble laundry detergent.

[0043] Example 2 (1) Weighing Weigh accurately according to the weight percentage: Core instant-dissolving components: 26 parts surfactant (14 parts sodium fatty alcohol polyoxyethylene ether sulfate, 4.5 parts cocamidopropyl betaine, 7.5 parts sodium α-sulfo fatty acid methyl ester), 43 parts porous instant-dissolving material (34 parts sodium sulfate, 6.5 parts zeolite, 2.5 parts polyethylene glycol-polyvinyl alcohol graft copolymer), and 7.5 parts water-soluble additives (4.5 parts anhydrous sodium citrate, 3 parts sodium disilicate). The outer shell moisture-proof components are: 6.5 parts moisture-proof material (4 parts ammonia-terminated polydimethylsiloxane, 32.5 parts fatty alcohol polyoxyethylene ether), 3.5 parts shell conditioner (1.5 parts glyceryl monostearate, 2 parts silica), and 1 part anti-caking agent (1 part hydroxypropyl starch). Functional additives: 0.2 parts whitening agent, 2 parts compound enzyme granules, 0.6 parts fragrance.

[0044] (2) Preparation of porous core particles The porous, readily soluble material and water-soluble additive were mixed and dried at 80°C to a moisture content of 0.54 wt%. After cooling to 23°C, a surfactant was added, and 5% by weight of deionized water of the readily soluble core component was sprayed on. The mixture was then fed into a high-shear granulator, with the rotation speed controlled at 1200 r / min and the temperature at 40°C. Granulation was carried out for 20 min, and the mixture was dried at 50°C to a moisture content of 0.39 wt% to obtain porous core particles.

[0045] (3) Preparation of coated dispersion Moisture-proof material, shell conditioner, and anti-caking agent were added to deionized water and stirred at 60℃ and 600r / min for 30min to obtain a 25% (w / w) coated dispersion.

[0046] (4) Coating and shaping Porous core particles are fed into a low-temperature fluidized bed, with the inlet air temperature controlled at 45℃, the outlet air temperature at 35℃, and the air velocity at 1.2m / s. The coating dispersion is then sprayed using high-pressure atomization at a pressure of 0.3MPa and a spraying speed of 1kg / h for 20 minutes. Gradient cooling is then applied to reduce the inlet air temperature from 45℃ to 25℃ at a rate of 5℃ / 10 minutes, followed by a setting time of 20 minutes to obtain the initial product.

[0047] (5) Finished product preparation The initial product and functional additives are placed in a mixer and stirred at 300 rpm for 10 minutes to obtain the moisture-proof water-soluble laundry detergent product.

[0048] Example 3 (1) Weighing Weigh accurately according to the weight percentage: Core instant-dissolving components: 15.5 parts surfactant (9 parts sodium fatty alcohol polyoxyethylene ether sulfate, 2.5 parts cocamidopropyl betaine, 4 parts sodium α-sulfonyl fatty acid methyl ester), 52.5 parts porous instant-dissolving material (41 parts sodium sulfate, 10 parts zeolite, 1.5 parts polyethylene glycol-polyvinyl alcohol graft copolymer), and 11.5 parts water-soluble additives (6.5 parts anhydrous sodium citrate, 5 parts sodium disilicate). The outer shell moisture-proof components are: 11 parts moisture-proof material (6.5 parts ammonia-terminated polydimethylsiloxane, 34.5 parts fatty alcohol polyoxyethylene ether), 5.5 parts shell conditioner (2.5 parts glyceryl monostearate, 3 parts silica), and 1.5 parts anti-caking agent (1.5 parts hydroxypropyl starch). Functional additives: 0.2 parts whitening agent, 0.8 parts compound enzyme granules, and 0.4 parts fragrance.

[0049] (2) Preparation of porous core particles The porous, readily soluble material and water-soluble additives were placed in a dryer and dried at 90°C until the moisture content was 0.43%. After cooling to 27°C, a surfactant was added, and 8% by weight of deionized water of the readily soluble core component was sprayed on. The mixture was then fed into a high-shear granulator, with the rotation speed controlled at 1500 r / min and the temperature at 45°C. Granulation was carried out for 25 min, and the mixture was dried at 55°C until the moisture content was 0.28 wt% to obtain porous core particles.

[0050] (3) Preparation of coated dispersion Moisture-proof material, shell conditioner, and anti-caking agent were added to deionized water and stirred at 65℃ and 800r / min for 40min to obtain a 30% (w / w) coating dispersion.

[0051] (4) Coating and shaping Porous core particles are fed into a low-temperature fluidized bed, with the inlet air temperature controlled at 55℃, the outlet air temperature at 40℃, and the air velocity at 1.5m / s. The coating dispersion is then sprayed using high-pressure atomization at a pressure of 0.5MPa and a spraying speed of 1.5kg / h for 30 minutes. Gradient cooling is then applied to reduce the inlet air temperature from 45℃ to 25℃ at a rate of 5℃ / 10min, followed by a setting time of 30 minutes to obtain the initial product.

[0052] (5) Finished product preparation The initial product and functional additives are placed in a mixer and stirred at 400 rpm for 15 minutes to obtain the moisture-proof water-soluble laundry detergent product.

[0053] Comparative Example 1 Unlike Example 1, the moisture-proof material consists of only 8.5 parts of ammonia-terminated polydimethylsiloxane, while the weight percentage of the moisture-proof material remains unchanged.

[0054] Comparative Example 2 Unlike Example 1, the moisture-proof material is only 8.5 parts of fatty alcohol polyoxyethylene ether-3, and the weight parts of the moisture-proof material remain unchanged.

[0055] Comparative Example 3 Unlike Example 1, the surfactant was replaced with 11.5 parts of sodium dodecylbenzenesulfonate, 3.5 parts of fatty alcohol polyoxyethylene ether-9, and 5.5 parts of sodium fatty alcohol polyoxyethylene ether sulfate, while the total weight of the surfactant remained unchanged.

[0056] Comparative Example 4 Unlike Example 1, the porous instant-dissolving material was replaced with 37.5 parts of porous starch, 8.5 parts of diatomaceous earth, and 2 parts of sodium carboxymethyl cellulose, while the total weight of the porous instant-dissolving material remained unchanged.

[0057] Comparative Example 5 Unlike Example 1, the preparation method of the laundry detergent is as follows: all components are mixed and placed in a high-speed mixer, and mixed at 800 r / min for 20 min to obtain a mixture; the mixture is then fed into a high-shear granulator, and granulated at 1350 r / min and 42°C for 22 min; and dried at 52°C to a moisture content of 0.25 wt% to obtain the laundry detergent.

[0058] Experimental Example 1 Moisture resistance test Weigh 50g of each of the laundry detergent samples prepared in Examples 1-3 and Comparative Examples 1-5, spread them evenly in a weighing bottle with a diameter of 10cm, and place them in a constant temperature and humidity chamber. Set the temperature to 40℃ and the relative humidity to 85% and leave for 72h. Take out the samples at 24h, 48h and 72h respectively, weigh the mass change, and calculate the moisture absorption rate.

[0059] Moisture absorption rate (%) = (mass after moisture absorption – mass before moisture absorption) / mass before moisture absorption × 100%.

[0060] The moisture absorption rate results of the laundry detergents in Examples 1-3 and Comparative Examples 1-5 are shown in Table 1.

[0061] Table 1. Moisture absorption rate (%) of laundry detergents in Examples 1-3 and Comparative Examples 1-5 As shown in Table 1, the moisture-proof water-soluble laundry detergents prepared in Examples 1-3 exhibit slow overall moisture absorption rate and low total moisture absorption under high humidity conditions of 40°C and 85% relative humidity, indicating that the laundry detergents of the present invention possess moisture-proof and moisture-resistant properties.

[0062] Comparative Example 1 used only ammonia-terminated polydimethylsiloxane as the moisture-proof material, lacking fatty alcohol polyoxyethylene ether-3. This resulted in decreased uniformity and integrity of the coating layer, significantly weakening its moisture barrier ability and leading to increased moisture absorption. Comparative Example 2 used only fatty alcohol polyoxyethylene ether-3, failing to form an effective hydrophobic barrier, thus increasing moisture absorption. The data from Comparative Examples 1 and 2 indicate that the combination of ammonia-terminated polydimethylsiloxane and fatty alcohol polyoxyethylene ether-3 is the key component for achieving moisture protection. Comparative Example 3 changed the surfactant system, and Comparative Example 4 replaced the porous instant-dissolving material. Because the core component was encapsulated during the preparation process, the moisture absorption rate did not change significantly compared to the examples. Comparative Example 5 used a conventional mixing and granulation process, lacking a core-shell structure and directional coating. The particles were entirely exposed to moisture, leading to increased moisture absorption and reduced moisture-proof performance. Therefore, this invention, through the outer shell moisture-proof component and gradient cooling coating method, significantly improves the storage stability of laundry detergent in high-humidity environments and exhibits excellent moisture-proof effects.

[0063] Experimental Example 2 Water solubility test Take 1 L of deionized water at 10℃±0.5℃ and place it in a transparent container. Place the container on a thermostatic magnetic stirrer and adjust the stirring speed to 300 r / min. Weigh 5 g of the laundry detergent samples prepared in Examples 1-3 and Comparative Examples 1-5 and quickly add them to the water. Record the time from when no visible particles are visible in the solution and the solution is uniformly transparent as the complete dissolution time.

[0064] The dissolution times of the laundry detergents in Examples 1-3 and Comparative Examples 1-5 are shown in Table 2.

[0065] Table 2. Dissolution time (s) of laundry detergents in Examples 1-3 and Comparative Examples 1-5 As shown in Table 2, the laundry detergents in Examples 1-3 can dissolve quickly and without residue at low temperatures, achieving rapid dissolution in cold water. Comparative Example 1, due to its coating layer containing only amino-terminated polydimethylsiloxane, exhibits excessive hydrophobicity and insufficient coating flexibility, resulting in a slower disintegration and dissolution rate in cold water and a significantly prolonged complete dissolution time. Comparative Example 2, lacking a core hydrophobic film-forming component, has a faster dissolution rate than Comparative Example 1, but it cannot simultaneously maintain moisture-proof performance. This indicates that a compound of moisture-proof materials can balance the hydrophobicity and water solubility of the coating, preventing the coating from hindering rapid dissolution. In Comparative Example 3, changing the surfactant system resulted in decreased low-temperature dissolution and dispersion performance. In Comparative Example 4, replacing the porous rapid-dissolving material disrupted the interconnected porous core structure, reducing the water absorption and disintegration rate and prolonging the dissolution time. This demonstrates that a specific surfactant compound and a porous rapid-dissolving material system are crucial factors in ensuring rapid dissolution performance. Comparative Example 5, using a conventional mixed granulation process, lacks a porous core structure, resulting in a shorter dissolution time. Although the dissolution rate is slightly better, its moisture-proof performance is poor. As can be seen, this invention, through the construction of a porous, fast-dissolving core and the hydrophilic-hydrophobic synergistic coating design, can achieve rapid dissolution under cold water conditions while ensuring excellent moisture-proof performance, demonstrating the advantages of the core-shell structure design and components in balancing moisture-proof and fast-dissolving properties.

[0066] Experimental Example 3 Washing performance test The detergency of the laundry detergent samples prepared in Examples 1-3 and Comparative Examples 1-5, as well as the commercially available laundry detergent (Vitality 28 Cold Water Quick Clean Laundry Detergent) sample, was determined.

[0067] Test method: The method in GB / T 13174-2021 "Determination of detergency and recycle performance of detergents for clothing" was used for testing. JB-01 carbon black oil-stained cloth, JB-02 protein-stained cloth, JB-03 sebum-stained cloth and relative standard detergent were prepared. The laundry powder samples prepared in Examples 1-3 and Comparative Examples 1-5, the commercially available laundry powder (Vitality 28 Cold Water Quick Clean Laundry Powder) sample and the relative standard detergent were used to clean the JB-01 carbon black oil-stained cloth, JB-02 protein-stained cloth and JB-03 sebum-stained cloth respectively. According to the test method in the test procedure in section 7, the detergency ratio of the relative standard detergent was calculated. The higher the detergency ratio, the stronger the washing performance of the product.

[0068] The relative stain removal ratios of the laundry detergents prepared in Examples 1-3 and Comparative Examples 1-5, as well as commercially available laundry detergents, to the three types of soiled fabrics using standard detergents are shown in Table 3.

[0069] Table 3. Results of the detergency ratio of various samples relative to the standard detergent As shown in Table 3, the relative detergency ratios of Examples 1-3 for JB-01 carbon black oil-stained cloth, JB-02 protein-stained cloth, and JB-03 sebum-stained cloth with the standard detergent were all superior to those of Comparative Examples 1-5 and commercially available cold-water quick-cleaning laundry detergent, indicating that the laundry detergents of Examples 1-3 have highly efficient and broad-spectrum detergency capabilities. This invention uses a compound surfactant of sodium fatty alcohol polyoxyethylene ether sulfate, cocamidopropyl betaine, and sodium α-sulfonyl fatty acid methyl ester to synergistically achieve detergency, emulsification, and dispersion functions. Combined with porous, fast-dissolving materials to rapidly release the active ingredients, and zeolite and water-soluble additives to soften the water, the detergency efficiency is maximized.

[0070] Comparative Examples 1 and 2, due to their single moisture-proof material and defective coating structure, experienced delayed release of active ingredients, resulting in a significant decrease in detergency ratio. Comparative Example 3, by changing the surfactant system, disrupted the original synergistic detergency mechanism, achieving the lowest detergency ratio for all three types of soiled fabrics, indicating a significant weakening of detergency. Comparative Example 4, by replacing the porous, fast-dissolving material, reduced the active ingredient carrying and dispersion effect, resulting in inferior detergency performance compared to the examples. Comparative Example 5, lacking a core-shell structure and directional coating, exhibited uneven distribution of active ingredients, leading to a lower detergency ratio. The detergency ratio of commercially available laundry detergents fell between that of the examples and the comparative examples, further verifying that the formulation and process of the examples can significantly improve washing efficiency. This demonstrates that the technical solution of the present invention can achieve efficient release of active ingredients and synergistic detergency, exhibiting excellent removal effects on common stains such as oil, protein, and sebum. Its overall washing performance surpasses existing commercially available products and conventional formulation processes, meeting the demands of high-quality washing.

[0071] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A moisture-proof, water-soluble laundry detergent, characterized in that, It is composed of a core fast-dissolving component, an outer shell moisture-proof component, and functional additive components in a weight ratio of (70-85):(12-25):(1-5); The core instant-dissolving component comprises the following raw materials in parts by weight: 13-28 parts of surfactant, 36-60 parts of porous instant-dissolving material, and 5-13 parts of water-soluble additive; the surfactant is composed of sodium fatty alcohol polyoxyethylene ether sulfate, cocamidopropyl betaine, and sodium α-sulfonyl fatty acid methyl ester in a mass ratio of (8-15):(2-5):(3-8). The outer shell moisture-proof component includes the following raw materials in parts by weight: 5-12 parts moisture-proof material, 2-7 parts shell conditioning agent, and 0.5-2 parts anti-caking agent; the moisture-proof material is composed of ammonia-terminated polydimethylsiloxane and fatty alcohol polyoxyethylene ether-3 in a weight ratio of (3-7):(2-5).

2. The moisture-proof water-soluble laundry detergent according to claim 1, characterized in that, The porous, fast-dissolving material is composed of sodium sulfate, zeolite, and polyethylene glycol-polyvinyl alcohol graft copolymer in a weight ratio of (30-45):(5-12):(1-3).

3. The moisture-proof water-soluble laundry detergent according to claim 1, characterized in that, The water-soluble additive is at least one of anhydrous sodium citrate and sodium disilicate.

4. The moisture-proof water-soluble laundry detergent according to claim 1, characterized in that, The functional additive is at least one of whitening agent, compound enzyme granules, and fragrance.

5. The moisture-proof water-soluble laundry detergent according to claim 1, characterized in that, The shell regulator is at least one of glyceryl monostearate and silicon dioxide.

6. The moisture-proof water-soluble laundry detergent according to claim 1, characterized in that, The anti-caking agent includes hydroxypropyl starch.

7. A method for preparing a moisture-proof water-soluble laundry detergent according to any one of claims 1-6, characterized in that, include: Porous quick-dissolving material, water-soluble additives, and surfactants are mixed, granulated, and dried to obtain porous core particles; moisture-proof material, shell regulator, anti-caking agent, and water are mixed to obtain a coating dispersion; the coating dispersion is sprayed onto the surface of the porous core particles using high-pressure atomization, and then cooled in a gradient to obtain a preliminary product, which is then mixed with functional additives to obtain a moisture-proof water-soluble laundry detergent.

8. The preparation method according to claim 7, characterized in that, The preparation method of the coating dispersion includes: mixing moisture-proof material, shell conditioner and anti-caking agent with water, stirring at 60-65℃ to obtain coating dispersion.

9. The preparation method according to claim 7, characterized in that, The high-pressure atomization spraying has an atomization pressure of 0.3-0.5 MPa, a spraying speed of 1-1.5 kg / h, and a spraying time of 20-30 min.

10. The preparation method according to claim 7, characterized in that, The gradient cooling includes: reducing the inlet air temperature from 45°C to 25°C at a cooling rate of 5°C / 10min, and a setting time of 20-30min.

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