A fragrance-remaining laundry condensate bead and a preparation method thereof

Abstract

The application provides a fragrance-retaining laundry condensation bead and a preparation method thereof, and belongs to the technical field of detergents. The laundry condensation bead comprises a water-soluble film layer and active contents wrapped therein. The active contents are composed of the following raw materials in parts by weight: 20-30 parts of a non-ionic surfactant, 15-25 parts of an anionic surfactant, 0.5-0.8 parts of a protease, 2.5-4.5 parts of plant fragrance microcapsules, 0.1-0.3 parts of a preservative, 1-2 parts of a plant fragrance, 20-30 parts of a cosolvent, and 5-15 parts of water. The water-soluble film layer is a PVA water-soluble film. The laundry condensation bead prepared by the application has excellent decontamination capacity and persistent fragrance-retaining effect, and is easy to rinse, mild and harmless to clothes.

Description

Technical Field

[0001] This invention belongs to the field of detergent technology, specifically relating to a fragrance-retaining laundry detergent pod and its preparation method. Background Technology

[0002] Laundry detergent pods are a new type of cleaning product that encapsulates concentrated detergent in a water-soluble film. Designed specifically for machine washing, their core advantages are convenience and efficiency. No manual weighing of detergent is required; simply drop one pod into the washing machine to clean and care for your clothes. With consumers' increasing demands for quality of life, especially the younger generation's pursuit of a "refined and convenient" lifestyle, the market demand for laundry detergent pods has exploded. The advantages of laundry detergent pods include: high active ingredient content, low foaming and easy rinsing, reduced packaging waste and transportation costs, while also providing cleaning, softening, and color protection functions. However, despite the huge market potential, existing products still suffer from poor formula stability and insufficient fragrance longevity, requiring further improvement and optimization to meet consumers' dual needs for multifunctionality and convenience.

[0003] Currently, the mainstream formula for laundry detergent pods typically consists of surfactants, enzymes, builders, fragrances, and water, with precise dosage control achieved through water-soluble membrane encapsulation technology. Early technologies often used single active ingredients or simple compound systems, making it difficult to balance cleaning power and fabric care. In recent years, some companies have attempted to enhance product functionality by adding natural extracts or antibacterial agents, but these methods suffer from poor ingredient compatibility and easy sedimentation of active ingredients. Furthermore, traditional preparation methods rely on high-temperature, high-pressure processes, which are not only energy-intensive but may also damage the fragrance molecular structure, leading to unstable fragrance release. Some products reduce fragrance usage to lower costs, further weakening the fragrance retention effect. Additionally, existing water-soluble membrane materials dissolve slowly in low-temperature or hard water, easily causing residue or membrane rupture risks, impacting the user experience. These technological bottlenecks limit the expansion of laundry detergent pods in the high-end market, especially in niche markets where long-lasting fragrance is crucial.

[0004] To address the aforementioned issues, researchers have attempted optimization through the following methods: first, developing sustained-release fragrance microcapsule technology to prolong fragrance adhesion time; second, employing bio-based surfactants and low-temperature encapsulation processes to improve formulation stability and reduce energy consumption; and third, introducing a multi-chamber structure design to separate detergent and fragrance components, preventing mutual interference. However, these methods still face their own challenges: microcapsule fragrances are expensive and prone to premature release during washing; low-temperature processes require extremely high equipment precision, making large-scale mass production difficult; while multi-chamber structures can prolong fragrance retention, they increase production complexity and cost. Furthermore, achieving synergistic effects between fragrance and detergent components while maintaining high concentrations of active ingredients remains a technical challenge. Therefore, there is an urgent need to develop a new laundry detergent pod that combines efficient cleaning with long-lasting fragrance and its preparation method. Summary of the Invention

[0005] The purpose of this invention is to provide a fragrance-retaining laundry detergent pod and its preparation method. By optimizing the nonionic surfactant, anionic surfactant and protease in the formula, and adding specific plant fragrance microcapsules and plant fragrances, the laundry detergent pod can simultaneously achieve the effects of highly efficient cleaning and long-lasting fragrance.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a fragrance-retaining laundry detergent pod, comprising a water-soluble film layer and encapsulated active contents; the active contents are composed of the following raw materials in parts by weight:

[0008] 20-30 parts nonionic surfactant, 15-25 parts anionic surfactant, 0.5-0.8 parts protease, 2.5-4.5 parts plant fragrance microcapsules, 0.1-0.3 parts preservative, 1-2 parts plant fragrance, 20-30 parts solubilizer, and 5-15 parts water.

[0009] Preferably, the nonionic surfactant is one or a mixture of several of the following: fatty acid methyl ester ethoxylate, isomeric decaethanol polyoxyethylene ether, cocoyl monoethanolamide, alkyl glycoside, and fatty amine polyoxyethylene ether.

[0010] Preferably, the nonionic surfactant is a mixture of fatty acid methyl ester ethoxylate, isomeric decayl alcohol polyoxyethylene ether, and coconut oil monoethanolamide in a weight ratio of 3:1-2:1-2.

[0011] Preferably, the anionic surfactant is one or a mixture of several of the following: sodium lauryl polyoxyethylene ether sulfate, potassium cocoyl glycinate, sodium α-alkenyl sulfonate, sodium fatty alcohol polyoxyethylene ether carboxylate, and sodium fatty alcohol polyoxyethylene ether sulfate.

[0012] Preferably, the anionic surfactant is a mixture of sodium lauryl polyoxyethylene ether sulfate, potassium cocoyl glycinate, and sodium α-alkenyl sulfonate in a weight ratio of 5:2-3:2-3.

[0013] This invention employs the aforementioned combination of nonionic and anionic surfactants to significantly enhance the overall detergency of laundry detergent pods through multiple synergistic effects. Fatty acid methyl ester ethoxylate, as the primary nonionic surfactant, possesses a unique ester-ethoxylated intercalation structure that imparts excellent oil emulsification and stripping capabilities, particularly achieving deep penetration and solubilization of triglycerides and fatty acids in sebum. However, single fatty acid methyl ester ethoxylate has limitations in terms of particulate dirt dispersibility and low-temperature water solubility. Therefore, isomeric decaethanol polyoxyethylene ether is introduced. Its highly branched hydrophobic groups significantly reduce interfacial tension, enhancing rapid wetting and penetration of sebum dirt, while simultaneously improving resistance to redeposition of carbon black particles. Cocoyl oleate monoethanolamide plays a dual role; its amide group and hydroxyl group provide strong hydrogen bonding, effectively adsorbing polypeptide chains in protein stains, loosening them, assisting in the targeted decomposition of proteases, and simultaneously acting as a foam stabilizer to maintain a rich foam layer and prolong the suspension time of carbon black particles in the washing liquid to prevent secondary deposition. In the anionic system, lauryl alcohol polyol... Sodium polyoxyethylene ether sulfate provides a powerful substrate for coiling grease and suspended particles due to its high charge density and micelle formation ability, but it has weak hard water adaptability. The addition of sodium α-alkenyl sulfonate, with its linear alkane chain and sulfonic acid group, endows it with excellent calcium soap dispersing power and hard water resistance, ensuring the maintenance of micelle stability during carbon black cleaning. Its low-temperature solubility characteristics, together with the non-ionic system, ensure the uniformity of the contents of the beads. The introduction of potassium cocoyl glycinate is the breakthrough. Its amino acid-type amphoteric structure plays a bridging role in cleaning protein-stained cloths. The carboxyl group adsorbs positively charged protein dirt through electrostatic interaction, causing it to spread. The glycine fragment is affinity to the active site of the protease, improving the enzymatic hydrolysis efficiency. In sebum removal, its mild and low-irritant properties reduce the interfacial adhesion of sebum oxidation products and form a co-emulsification system with fatty acid methyl ester ethoxylate / sodium lauryl ether sulfate to accelerate oil droplet removal.

[0014] Preferably, the method for preparing the plant fragrance microcapsules includes the following steps:

[0015] Plant fragrance and hydroxypropyl-β-cyclodextrin were mixed, then water was added and the mixture was heated and stirred. Caprylic / capric triglycerides were added and the mixture was stirred and cooled to obtain a fragrance-cyclodextrin inclusion complex. Gelatin and sodium caseinate were added to water, heated and stirred, then tea polyphenols were added and stirred. The pH was adjusted to alkaline, then genipin was added and the mixture was stirred and cooled to obtain a wall material solution.

[0016] Under stirring conditions, the fragrance-cyclodextrin inclusion complex was added dropwise to the wall material solution. After the addition was complete, high-speed shear emulsification was performed, followed by continued stirring. After cooling and standing, the mixture was centrifuged, washed with water, and dried to obtain plant fragrance microcapsules.

[0017] In the aforementioned plant fragrance microcapsules, the plant fragrance is encapsulated by hydroxypropyl-β-cyclodextrin to form a molecular-level sustained-release core. The hydrophobic cavity of the cyclodextrin is precisely locked with the fragrance molecules through van der Waals forces, significantly reducing the fragrance evaporation rate and blocking the erosion of oxidative components in the formula. Caprylic / capric triglycerides serve as a key auxiliary carrier. Their short- and medium-chain fatty acid structures enhance the solubility and stability of the fragrance in a hydrophobic environment and form co-assemblies with the cyclodextrin during the emulsification stage. The alkyl chains of the glycerides insert into the hydrophobic cavity of the cyclodextrin to extend the encapsulation depth, while the ester groups associate with the polar groups of the fragrance, forming a bilayer protective barrier. This structure... This further reduces the volatility of the fragrance. Sodium caseinate plays a key role in structural reinforcement in the wall material. Its amphiphilic peptide chains bind to the gelatin helical region through the hydrophobic water, while the hydrophilic ends are densely bonded to the genipin crosslinking sites to form a network reinforcement phase, which effectively resists the microcapsule rupture caused by washing friction. Tea polyphenols ionize into phenol-oxygen anions in an alkaline environment. Their resonance structure captures free radicals to terminate the fragrance oxidation chain reaction and conjugates with the genipin crosslinking network to improve ultraviolet light stability. The plant fragrance microcapsules are persistently adsorbed between the microcapsules and the fibers, which ultimately significantly improves the persistence of the plant fragrance microcapsule products and achieves a long-lasting fragrance effect.

[0018] Preferably, the weight ratio of the plant flavoring, hydroxypropyl-β-cyclodextrin, and caprylic / capric triglyceride is 2-8:20-50:4-6.

[0019] Preferably, the weight ratio of gelatin, sodium caseinate, tea polyphenols, and genipin is 10-30:2-8:0.5-1.5:0.5-1.

[0020] Preferably, the weight ratio of the flavor-cyclodextrin inclusion complex to the wall material solution is 30-50:100-200.

[0021] Preferably, the method for preparing the plant fragrance microcapsules includes the following steps:

[0022] By weight, 2-8 parts of plant fragrance and 20-50 parts of hydroxypropyl-β-cyclodextrin are mixed, then 10-40 parts of water are added, and the mixture is stirred at 50-60℃ and 500-700r / min for 20-40min. Then 4-6 parts of caprylic / capric triglycerides are added and the mixture is stirred for 10-30min. The mixture is cooled to room temperature to obtain the fragrance-cyclodextrin inclusion complex.

[0023] Add 10-30 parts of gelatin and 2-8 parts of sodium caseinate to 200-400 parts of water, stir at 40-50°C and 300-500 r / min for 20-40 min, then add 0.5-1.5 parts of tea polyphenols and stir for 5-15 min. Adjust the pH to 8.0-9.0, then add 0.5-1 parts of genipin and continue stirring for 1-2 h. Cool to room temperature to obtain the wall material solution.

[0024] Under stirring conditions of 30-35°C and 200-400 r / min, 30-50 parts of the fragrance-cyclodextrin inclusion complex were added dropwise to 100-200 parts of the wall material solution at a dropping rate of 1-3 mL / min. After the addition was complete, the mixture was emulsified by high-speed shearing at 15000-20000 r / min for 3-7 min. Then, the mixture was stirred at 30-35°C and 200-400 r / min for 1-3 h. After cooling to room temperature, the mixture was allowed to stand for 30-50 min, centrifuged, washed with water 2-5 times, and freeze-dried to obtain plant fragrance microcapsules.

[0025] Preferably, the preservative is one or a mixture of several of 1,3-dihydroxymethyl-5,5-dimethylhydantoin, phenoxyethanol, ethylhexylglycerin, methylparaben, and chloromethylisothiazolinone.

[0026] Preferably, the preservative is 1,3-dihydroxymethyl-5,5-dimethylhydantoin.

[0027] Preferably, the co-solvent is one or a mixture of several of glycerol, dipropylene glycol, diethylene glycol monobutyl ether, sorbitol, and isopropanol.

[0028] Preferably, the co-solvent is a mixture of glycerol, dipropylene glycol, and diethylene glycol monobutyl ether in a weight ratio of 1-3:1-3:1.

[0029] Preferably, the plant fragrance is one or a mixture of several of the following: jasmine fragrance, magnolia fragrance, lavender fragrance, sweet orange fragrance, and lemon fragrance.

[0030] Preferably, the plant fragrance is jasmine fragrance.

[0031] Preferably, the water-soluble film layer is a PVA water-soluble film; the thickness of the PVA water-soluble film is 35-90 μm.

[0032] This invention also provides a method for preparing fragrance-retaining laundry detergent pods, comprising the following steps:

[0033] Weigh out each ingredient according to the formula, mix nonionic surfactant, anionic surfactant, cosolvent and water evenly, then add protease and plant fragrance microcapsules and mix evenly, finally add preservative and plant fragrance and mix evenly, let stand to defoam, and obtain active contents; add active contents to laundry detergent pod coating machine, and encapsulate with water-soluble film layer to obtain fragrance-retaining laundry detergent pods.

[0034] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0035] (1) This invention provides a fragrance-retaining laundry detergent pod and its preparation method. By optimizing the raw material formula, a nonionic surfactant composed of fatty acid methyl ester ethoxylate, isomeric decayl alcohol polyoxyethylene ether, and coconut oil monoethanolamide is used, and an anionic surfactant composed of sodium lauryl polyoxyethylene ether sulfate, potassium cocoyl glycinate, and sodium α-alkenyl sulfonate is used. Specific plant fragrance microcapsules and plant fragrances are added for combined use, so that the laundry detergent pod not only has excellent detergency and long-lasting fragrance effect, but is also easy to rinse, gentle, and does not damage clothes.

[0036] (2) The present invention uses a combination of nonionic and anionic surfactants, wherein the ester-ethoxy chimeric structure of fatty acid methyl ester ethoxylate has the ability to emulsify and remove grease, the branched hydrophobic group of isomeric decaethanol polyoxyethylene ether can significantly reduce interfacial tension, enhance rapid wetting and penetration of sebum and dirt, and improve the resistance to redeposition of carbon black and other particles, while the amide group and hydroxyl group of coconut oil monoethanolamide provide strong hydrogen bonding, effectively adsorbing polypeptide chains in protein stains to loosen them, assisting protease in targeted decomposition, and maintaining The rich foam layer prolongs the suspension time of carbon black particles in the washing liquid, preventing secondary deposition. Sodium lauryl polyoxyethylene ether sulfate provides a strong base for curling grease and suspended particles due to its high charge density and micelle formation ability. The linear alkane chain and sulfonic acid group of sodium α-alkenyl sulfonate have calcium soap dispersing power and hard water resistance, ensuring the maintenance of micelle stability during carbon black cleaning. The amino acid-type amphoteric structure of potassium cocoyl glycinate plays a bridging role in cleaning protein-stained cloths. The carboxylate group adsorbs positively charged protein dirt through electrostatic interaction, causing it to spread out.

[0037] (3) The present invention also incorporates specific plant fragrance microcapsules for use with plant fragrances. Hydroxypropyl-β-cyclodextrin encapsulates the fragrance to form a molecular-level sustained-release core. The hydrophobic cavity of cyclodextrin is precisely locked with the fragrance molecules through van der Waals forces, which greatly reduces the evaporation rate of the fragrance and blocks the erosion of oxidizing components in the formula. The short- and medium-chain fatty acid structure of caprylic / capric triglycerides not only enhances the solubility stability of the fragrance in the hydrophobic environment, but also forms a co-assembly with cyclodextrin in the emulsification stage. The alkyl chain of its glyceride inserts into the hydrophobic cavity of cyclodextrin to extend the encapsulation depth, while the ester group associates with the polar group of the fragrance to form a bilayer protective barrier. This structure further reduces the volatility of the fragrance. Sodium caseinate plays a structural reinforcing role in the wall material. Its amphiphilic peptide chain binds to the gelatin helical region through the hydrophobic water, while the hydrophilic end is densely bonded to the genipin crosslinking site to form a network reinforcing phase, which effectively resists the microcapsule rupture caused by washing friction. Finally, the persistence of the plant fragrance microcapsule product is significantly improved, and a long-lasting fragrance effect is achieved. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] The raw materials used in the embodiments and comparative examples of this invention are all derived from self-made or commercially available sources, but are not limited to the following materials:

[0040] Fatty acid methyl ester ethoxylate: Model number FMEE-24-06, purchased from China National Light Industry Chemical Technology Co., Ltd.

[0041] Isomeric deca-ol polyoxyethylene ether: model number KL-E1005, purchased from Liaoning Kelong Fine Chemical Co., Ltd.

[0042] Cocoyl oleate monoethanolamide: CAS No. 68140-00-1, purchased from Suzhou Kening Polyol Co., Ltd.

[0043] Sodium lauryl ether sulfate: CAS No. 9004-82-4, purchased from Shanghai Dingfen Chemical Technology Co., Ltd.

[0044] Potassium cocoyl glycinate: Model number YC03H-95, purchased from Changsha Puji Biotechnology Co., Ltd.

[0045] Sodium α-olefin sulfonate: Model name: Sodium α-olefin sulfonate, purchased from China National Light Industry Chemical Technology Co., Ltd.

[0046] Protease: Model UNO100L (Novozymes), purchased from Shenzhen Xianzhi Chemical Technology Co., Ltd.

[0047] Jasmine fragrance: Model number TY7054, purchased from Shanghai Tianyi Fragrance & Flavor Co., Ltd.

[0048] Hydroxypropyl-β-cyclodextrin: degree of substitution 3-9, water solubility ≥80g / 100mL, purchased from Jiangsu Fengyuan Biotechnology Co., Ltd.

[0049] Caprylic / capric triglyceride: Model GLTEST® GTCC, purchased from Guangdong Guleite New Material Technology Co., Ltd.

[0050] Gelatin: Model G8061, purchased from Beijing Solarbio Technology Co., Ltd.

[0051] Sodium caseinate: CAS No. 9005-46-3, purchased from Hunan Huibaiyi New Materials Co., Ltd.

[0052] PVA water-soluble membrane: Model L0800, purchased from Foshan Bowei Environmental Protection Materials Co., Ltd.

[0053] Example 1

[0054] This embodiment provides a fragrance-retaining laundry detergent pod, comprising a water-soluble film layer and encapsulated active contents; the active contents are composed of the following raw materials in parts by weight:

[0055] 25 parts nonionic surfactant, 20 parts anionic surfactant, 0.7 parts protease, 3.5 parts plant fragrance microcapsules, 0.2 parts preservative, 1.5 parts plant fragrance, 25 parts solubilizer, and 10 parts deionized water.

[0056] The nonionic surfactant is a mixture of fatty acid methyl ester ethoxylate, isomeric decayl alcohol polyoxyethylene ether, and coconut oil monoethanolamide in a weight ratio of 3:1.5:1.5.

[0057] The anionic surfactant is a mixture of sodium lauryl polyoxyethylene ether sulfate, potassium cocoyl glycinate, and sodium α-alkenyl sulfonate in a weight ratio of 5:3:2.

[0058] The preservative is 1,3-dihydroxymethyl-5,5-dimethylhydantoin.

[0059] The co-solvent is a mixture of glycerol, dipropylene glycol, and diethylene glycol monobutyl ether in a weight ratio of 2:2:1.

[0060] The plant fragrance is jasmine fragrance.

[0061] The water-soluble film layer is a PVA water-soluble film with a thickness of 75 μm.

[0062] The preparation method of the plant fragrance microcapsules includes the following steps:

[0063] By weight, 5 parts of plant fragrance and 35 parts of hydroxypropyl-β-cyclodextrin were mixed, then 25 parts of deionized water were added, and the mixture was stirred at 53°C and 600 r / min for 30 min. Then, 5 parts of caprylic / capric triglycerides were added and the mixture was stirred for another 20 min. The mixture was cooled to room temperature to obtain the fragrance-cyclodextrin inclusion complex. The plant fragrance was jasmine fragrance.

[0064] Add 20 parts gelatin and 5 parts sodium caseinate to 270 parts deionized water, stir at 48°C and 400 r / min for 30 min, then add 1 part tea polyphenol and stir for 10 min, adjust the pH to 8.5, then add 0.8 parts genipin and continue stirring for 1.5 h, cool to room temperature to obtain the wall material solution.

[0065] Under stirring conditions of 32°C and 300 r / min, 40 parts of fragrance-cyclodextrin inclusion complex were added dropwise to 150 parts of wall material solution at a dropping rate of 2 mL / min. After the addition was completed, the mixture was emulsified by high-speed shearing at 18000 r / min for 5 min. Then, the mixture was stirred at 32°C and 300 r / min for 2 h. After cooling to room temperature, the mixture was allowed to stand for 40 min, centrifuged, washed with water 3 times, and freeze-dried to obtain plant fragrance microcapsules.

[0066] This embodiment provides a method for preparing fragrance-retaining laundry detergent pods, including the following steps:

[0067] Weigh each ingredient according to the formula, mix nonionic surfactant, anionic surfactant, cosolvent and deionized water evenly, then add protease and plant fragrance microcapsules and mix evenly, finally add preservative and plant fragrance and mix evenly, let stand to defoam, and obtain active contents; add active contents to laundry detergent pod coating machine, and encapsulate with PVA water-soluble film to obtain fragrance-retaining laundry detergent pods.

[0068] Example 2

[0069] This embodiment provides a fragrance-retaining laundry detergent pod, comprising a water-soluble film layer and encapsulated active contents; the active contents are composed of the following raw materials in parts by weight:

[0070] 20 parts nonionic surfactant, 15 parts anionic surfactant, 0.5 parts protease, 2.5 parts plant fragrance microcapsules, 0.1 parts preservative, 1 part plant fragrance, 20 parts solubilizer, and 5 parts deionized water.

[0071] The nonionic surfactant is a mixture of fatty acid methyl ester ethoxylate, isomeric decayl alcohol polyoxyethylene ether, and coconut oil monoethanolamide in a weight ratio of 3:1:2.

[0072] The anionic surfactant is a mixture of sodium lauryl polyoxyethylene ether sulfate, potassium cocoyl glycinate, and sodium α-alkenyl sulfonate in a weight ratio of 5:2:3.

[0073] The preservative is 1,3-dihydroxymethyl-5,5-dimethylhydantoin.

[0074] The co-solvent is a mixture of glycerol, dipropylene glycol, and diethylene glycol monobutyl ether in a weight ratio of 1:3:1.

[0075] The plant fragrance is jasmine fragrance.

[0076] The water-soluble film layer is a PVA water-soluble film with a thickness of 75 μm.

[0077] The preparation method of the plant fragrance microcapsules is the same as that in Example 1.

[0078] This embodiment provides a method for preparing fragrance-retaining laundry detergent pods, including the following steps:

[0079] Weigh each ingredient according to the formula, mix nonionic surfactant, anionic surfactant, cosolvent and deionized water evenly, then add protease and plant fragrance microcapsules and mix evenly, finally add preservative and plant fragrance and mix evenly, let stand to defoam, and obtain active contents; add active contents to laundry detergent pod coating machine, and encapsulate with PVA water-soluble film to obtain fragrance-retaining laundry detergent pods.

[0080] Example 3

[0081] This embodiment provides a fragrance-retaining laundry detergent pod, comprising a water-soluble film layer and encapsulated active contents; the active contents are composed of the following raw materials in parts by weight:

[0082] 30 parts nonionic surfactant, 25 parts anionic surfactant, 0.8 parts protease, 4.5 parts plant fragrance microcapsules, 0.3 parts preservative, 2 parts plant fragrance, 30 parts solubilizer, and 15 parts deionized water.

[0083] The nonionic surfactant is a mixture of fatty acid methyl ester ethoxylate, isomeric decayl alcohol polyoxyethylene ether, and coconut oil monoethanolamide in a weight ratio of 3:2:1.

[0084] The anionic surfactant is a mixture of sodium lauryl polyoxyethylene ether sulfate, potassium cocoyl glycinate, and sodium α-alkenyl sulfonate in a weight ratio of 5:3:2.

[0085] The preservative is 1,3-dihydroxymethyl-5,5-dimethylhydantoin.

[0086] The co-solvent is a mixture of glycerol, dipropylene glycol, and diethylene glycol monobutyl ether in a weight ratio of 3:1:1.

[0087] The plant fragrance is jasmine fragrance.

[0088] The water-soluble film layer is a PVA water-soluble film with a thickness of 75 μm.

[0089] The preparation method of the plant fragrance microcapsules is the same as that in Example 1.

[0090] This embodiment provides a method for preparing fragrance-retaining laundry detergent pods, including the following steps:

[0091] Weigh each ingredient according to the formula, mix nonionic surfactant, anionic surfactant, cosolvent and deionized water evenly, then add protease and plant fragrance microcapsules and mix evenly, finally add preservative and plant fragrance and mix evenly, let stand to defoam, and obtain active contents; add active contents to laundry detergent pod coating machine, and encapsulate with PVA water-soluble film to obtain fragrance-retaining laundry detergent pods.

[0092] Comparative Example 1

[0093] The difference between this comparative example and Example 1 is that the nonionic surfactant is different, specifically as follows: the nonionic surfactant is a mixture of fatty acid methyl ester ethoxylate and isomeric deca-ol polyoxyethylene ether in a weight ratio of 3:3.

[0094] Comparative Example 2

[0095] The difference between this comparative example and Example 1 is that the nonionic surfactant is different, specifically as follows: the nonionic surfactant is a mixture of fatty acid methyl ester ethoxylate and coconut oil monoethanolamide in a weight ratio of 3:3.

[0096] Comparative Example 3

[0097] The difference between this comparative example and Example 1 is that the anionic surfactant is different, specifically as follows: the anionic surfactant is a mixture of sodium lauryl polyoxyethylene ether sulfate and potassium cocoyl glycinate in a weight ratio of 5:5.

[0098] Comparative Example 4

[0099] The difference between this comparative example and Example 1 is that the anionic surfactant is different, specifically as follows: the anionic surfactant is a mixture of sodium lauryl polyoxyethylene ether sulfate and sodium α-olefin sulfonate in a weight ratio of 5:5.

[0100] Comparative Example 5

[0101] The difference between this comparative example and Example 1 is that the preparation methods of the plant fragrance microcapsules are different, as follows: The preparation method of the plant fragrance microcapsules includes the following steps:

[0102] By weight, 5 parts of plant fragrance and 35 parts of hydroxypropyl-β-cyclodextrin were mixed, and then 25 parts of deionized water were added. The mixture was stirred at 53°C and 600 r / min for 30 min and cooled to room temperature to obtain the fragrance-cyclodextrin inclusion complex; the plant fragrance was jasmine fragrance.

[0103] Add 20 parts gelatin and 5 parts sodium caseinate to 270 parts deionized water, stir at 48°C and 400 r / min for 30 min, then add 1 part tea polyphenol and stir for 10 min, adjust the pH to 8.5, then add 0.8 parts genipin and continue stirring for 1.5 h, cool to room temperature to obtain the wall material solution.

[0104] Under stirring conditions of 32°C and 300 r / min, 40 parts of fragrance-cyclodextrin inclusion complex were added dropwise to 150 parts of wall material solution at a dropping rate of 2 mL / min. After the addition was completed, the mixture was emulsified by high-speed shearing at 18000 r / min for 5 min. Then, the mixture was stirred at 32°C and 300 r / min for 2 h. After cooling to room temperature, the mixture was allowed to stand for 40 min, centrifuged, washed with water 3 times, and freeze-dried to obtain plant fragrance microcapsules.

[0105] Comparative Example 6

[0106] The difference between this comparative example and Example 1 is that the preparation methods of the plant fragrance microcapsules are different, as follows: The preparation method of the plant fragrance microcapsules includes the following steps:

[0107] By weight, 5 parts of plant fragrance and 35 parts of hydroxypropyl-β-cyclodextrin were mixed, then 25 parts of deionized water were added, and the mixture was stirred at 53°C and 600 r / min for 30 min. Then, 5 parts of caprylic / capric triglycerides were added and the mixture was stirred for another 20 min. The mixture was cooled to room temperature to obtain the fragrance-cyclodextrin inclusion complex. The plant fragrance was jasmine fragrance.

[0108] Add 20 parts of gelatin to 270 parts of deionized water and stir at 48°C and 400 r / min for 30 min. Then add 1 part of tea polyphenol and stir for 10 min. Adjust the pH to 8.5, then add 0.8 parts of genipin and continue stirring for 1.5 h. Cool to room temperature to obtain the wall material solution.

[0109] Under stirring conditions of 32°C and 300 r / min, 40 parts of fragrance-cyclodextrin inclusion complex were added dropwise to 150 parts of wall material solution at a dropping rate of 2 mL / min. After the addition was completed, the mixture was emulsified by high-speed shearing at 18000 r / min for 5 min. Then, the mixture was stirred at 32°C and 300 r / min for 2 h. After cooling to room temperature, the mixture was allowed to stand for 40 min, centrifuged, washed with water 3 times, and freeze-dried to obtain plant fragrance microcapsules.

[0110] Performance testing

[0111] The following performance tests were conducted on the fragrance-retaining laundry pods prepared in Examples 1-3 and Comparative Examples 1-6. For the detergency test: the detergency value of each fragrance-retaining laundry pod on sebum-stained, protein-stained, and carbon-stained cloth was determined according to the method in standard GB / T13174-2021, and the detergency value of the standard laundry detergent on sebum-stained, protein-stained, and carbon-stained cloth was compared with that of the standard laundry detergent. The standard laundry detergent was prepared according to standard GB / T13174-2021 / XG1-2023. The machine wash time was 0.5 hours, the spin speed was 150 rpm, and the water temperature was 30°C. For the fragrance retention test: pure cotton clothing was washed with water according to standard GB / T8629-2017 using a standard washing machine cycle, and the fragrance-retaining laundry pods prepared in each example were added for washing. After washing, the clothing was dried. After storing the clothing in a storage room for one month, 20 evaluators were assigned to evaluate the stored clothing. The scoring criteria are as follows: 51-60 points indicate excellent fragrance longevity, 41-50 points indicate good fragrance longevity, 31-40 points indicate satisfactory fragrance longevity, 21-30 points indicate average fragrance longevity, 11-20 points indicate weak fragrance longevity, and 0-10 points indicate poor fragrance longevity; the maximum score is 60 points, with higher scores indicating better fragrance longevity. The results are shown in Table 1.

[0112] Table 1: Performance Test Results of Fragrance-Retaining Laundry Detergent Pods

[0113]

[0114] The test results above show that the laundry detergent pods prepared in Examples 1-3 of this invention possess both high-efficiency cleaning and stain removal capabilities and long-lasting fragrance, with the laundry detergent pod prepared in Example 1 exhibiting the best performance. This is because this invention, through optimized formulation and careful selection of nonionic and anionic surfactants, significantly enhances the cleaning ability of the laundry detergent pods on different types of stains, such as sebum-stained, protein-stained, and carbon-stained cloths. Furthermore, the addition of specific plant fragrance microcapsules, used in conjunction with plant fragrances, further enhances the long-lasting fragrance effect of the laundry detergent pods. Compared with Examples 1-3, Comparative Examples 1-2 did not simultaneously use isomeric decayl alcohol polyoxyethylene ether, cocoyl monoethanolamide and fatty acid methyl ester ethoxylate to form a nonionic surfactant, and Comparative Examples 3-4 did not simultaneously use potassium cocoyl glycinate, sodium α-alkenyl sulfonate and sodium lauryl alcohol polyoxyethylene ether sulfate to form an anionic surfactant. As a result, the cleaning ability of the laundry detergent pods described in Comparative Examples 1-4 for different types of stains such as sebum-stained cloth, protein-stained cloth, and carbon black-stained cloth decreased to varying degrees; and Comparative Examples 5-6 did not use plant fragrance microcapsules prepared by a specific method, resulting in a significant reduction in fragrance retention.

[0115] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles 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 fragrance-retaining laundry detergent pod, characterized in that, The active contents include a water-soluble membrane layer and an encapsulated layer; the active contents are composed of the following raw materials in parts by weight: 20-30 parts nonionic surfactant, 15-25 parts anionic surfactant, 0.5-0.8 parts protease, 2.5-4.5 parts plant fragrance microcapsules, 0.1-0.3 parts preservative, 1-2 parts plant fragrance, 20-30 parts solubilizer, 5-15 parts water; The nonionic surfactant is a mixture of fatty acid methyl ester ethoxylate, isomeric decayl alcohol polyoxyethylene ether, and coconut oil monoethanolamide in a weight ratio of 3:1.5:1.

5. The anionic surfactant is a mixture of sodium lauryl polyoxyethylene ether sulfate, potassium cocoyl glycinate, and sodium α-alkenyl sulfonate in a weight ratio of 5:3:

2. The preparation method of plant fragrance microcapsules includes the following steps: Plant fragrance and hydroxypropyl-β-cyclodextrin were mixed, then water was added and the mixture was heated and stirred. Caprylic / capric triglycerides were added and the mixture was stirred and cooled to obtain a fragrance-cyclodextrin inclusion complex. Gelatin and sodium caseinate were added to water, heated and stirred, then tea polyphenols were added and stirred. The pH was adjusted to alkaline, then genipin was added and the mixture was stirred and cooled to obtain a wall material solution. Under stirring conditions, the fragrance-cyclodextrin inclusion complex was added dropwise to the wall material solution. After the addition was complete, high-speed shear emulsification was performed, and then stirring was continued. After cooling, the mixture was allowed to stand, centrifuged, washed with water, and dried to obtain plant fragrance microcapsules. The weight ratio of plant flavoring, hydroxypropyl-β-cyclodextrin, and caprylic / capric triglycerides is 2-8:20-50:4-6; the weight ratio of gelatin, sodium caseinate, tea polyphenols, and genipin is 10-30:2-8:0.5-1.5:0.5-1; and the weight ratio of the flavoring-cyclodextrin inclusion complex and the wall material solution is 30-50:100-200.

2. The fragrance-retaining laundry detergent pods according to claim 1, characterized in that, The plant fragrance is one or a mixture of several of the following: jasmine fragrance, magnolia fragrance, lavender fragrance, sweet orange fragrance, and lemon fragrance.

3. The fragrance-retaining laundry detergent pods according to claim 1, characterized in that, The preservative is one or a mixture of several of 1,3-dihydroxymethyl-5,5-dimethylhydantoin, phenoxyethanol, ethylhexylglycerin, methylparaben, and chloromethylisothiazolinone; the cosolvent is one or a mixture of several of glycerol, dipropylene glycol, diethylene glycol monobutyl ether, sorbitol, and isopropanol; the water-soluble film layer is a PVA water-soluble film with a thickness of 35-90 μm.

4. The method for preparing fragrance-retaining laundry detergent pods according to any one of claims 1-3, characterized in that, Includes the following steps: Weigh out each ingredient according to the formula, mix nonionic surfactant, anionic surfactant, cosolvent and water evenly, then add protease and plant fragrance microcapsules and mix evenly, finally add preservative and plant fragrance and mix evenly, let stand to defoam, and obtain active contents; add active contents to laundry detergent pod coating machine, and encapsulate with water-soluble film layer to obtain fragrance-retaining laundry detergent pods.

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