A low-temperature, rapidly dissolving laundry detergent pod and its preparation method

Abstract

This invention belongs to the field of daily chemical detergent technology and discloses a low-temperature rapidly dissolving laundry pod and its preparation method. Addressing industry pain points such as poor low-temperature solubility of existing laundry pods, inability to balance solubility and storage stability, easy hydration and gelation of the internal system, and poor compatibility between the water-soluble film and the washing system, this invention uses maleic anhydride grafted and hydroxypropyl chain-extended polyvinyl alcohol for dual modification to prepare a composite modified water-soluble film. Simultaneously, by precisely controlling the ratio of anionic surfactants and compounding with a special anti-structuralization modifier, an anti-structuralization compound washing system is constructed. This invention breaks the technical prejudice that "rapid dissolution leads to poor moisture resistance," enabling laundry pods to quickly and completely dissolve in low-temperature water environments with efficient release of active ingredients. It also exhibits excellent storage stability and moisture resistance, low detergent residue, and superior cleaning power. The preparation process is green and environmentally friendly, requiring no additional equipment investment, resulting in low production costs and suitability for large-scale production applications.

Description

Technical Field

[0001] This invention belongs to the field of daily chemical washing technology, specifically relating to the field of laundry detergent pod preparation technology, and more specifically, relating to a low-temperature rapidly dissolving laundry detergent pod and its preparation method. Background Technology

[0002] Laundry detergent pods, as a new generation of pre-packaged detergent products, have become one of the fastest-growing categories in the domestic daily chemical detergent market due to their advantages such as ease of use, concentrated formula, strong cleaning power, and precise dosage. Their core structure involves encapsulating a high concentration of detergent components in a water-soluble polymer film, enabling a "one-pod-one-wash" usage mode, completely solving the pain points of traditional laundry detergents such as inconvenient pouring and difficulty in controlling the dosage.

[0003] However, existing laundry detergent pods have serious technical defects in practical applications, failing to meet the washing habits and usage needs of domestic consumers. These defects are specifically reflected in the following four aspects: First, their low-temperature solubility is extremely poor, making them unsuitable for domestic cold-water washing and quick-wash modes. Consumers in Europe and America generally use high-temperature washing modes of 40-60℃, so imported laundry detergent pods are designed for high-temperature environments, resulting in severe "acclimatization problems" after entering the domestic market. In China, over 90% of washing scenarios involve room-temperature cold water (5-25℃), and the quick-wash mode of mainstream washing machines only lasts 8-15 minutes. Under these conditions, existing laundry detergent pods dissolve slowly, and the high-concentration surfactant system inside easily forms a hydrated gel during hydration, exhibiting a hexagonal phase structure that hinders dissolution, preventing the rapid release of detergent components. Most commercially available products take over 15 minutes to completely dissolve at 20℃, and even over 30 minutes at 10℃. After the 8-minute quick-wash mode ends, more than 30% of the detergent components remain unreleased, causing not only serious waste of raw materials but also leading to incomplete cleaning and residual odors.

[0004] Secondly, there is a persistent technical contradiction between achieving both low-temperature solubility and storage stability. It is generally understood in the art that the stronger the hydrophilicity of the water-soluble film, the faster the low-temperature solubility, but the correspondingly worse the moisture resistance. In high-humidity storage environments with high surfactant content, laundry detergent pods are highly susceptible to moisture absorption, swelling, shrinkage, embrittlement, and leakage. Conversely, the stronger the hydrophobicity of the water-soluble film, the better the storage stability, but the difficulty of low-temperature solubility increases significantly. Existing technologies have consistently failed to balance this core contradiction, resulting in products that either meet solubility standards but have short shelf lives and are prone to leakage, or have satisfactory storage stability but extremely slow low-temperature solubility, failing to meet the 18-month shelf-life requirements and low-temperature washing needs of daily chemical products.

[0005] Third, the internal washing system is prone to structural transformation, further exacerbating the difficulty of dissolving at low temperatures. To reduce the impact on the water-soluble film, existing laundry detergent pods generally employ low-water-content formulations while adding large amounts of hydrophilic active solvents such as glycerol, propylene glycol, and PEG, forming a complex system of "high surfactant, low water content, and high hydrophilic solvent." In this system, surfactant molecules readily self-assemble at low water content to form complex micelle structures such as multilayered onion-like vesicles and layered phases. When hydrated in water, these structures further transform into a dense hexagonal gel phase, severely hindering water penetration and material dispersion. Especially at low temperatures, the molecular motion rate slows down, the gel structure becomes more stable, and the difficulty of dissolving increases exponentially.

[0006] Fourth, poor compatibility with washing systems can easily lead to quality problems during long-term storage. Most existing laundry detergent pods use ordinary unmodified PVA water-soluble membranes, which have poor compatibility with the high-concentration surfactant system inside. During long-term storage, the surfactants will migrate to the water-soluble membrane, causing the membrane to swell, soften, and lose strength, and even serious quality problems such as membrane breakage and leakage, and separation of the liquid and detergent.

[0007] In summary, developing a laundry detergent pod product that simultaneously solves the two core problems of "slow dissolution of water-soluble film at low temperatures" and "hydration gel of internal system," can dissolve rapidly and completely in a low-temperature water environment of 5~25℃, and also has excellent storage stability, a simple and green preparation process, and can be mass-produced, is a technical challenge that the daily chemical detergent industry urgently needs to solve. Summary of the Invention

[0008] The purpose of this invention is to overcome the aforementioned defects and shortcomings of the prior art. Starting from both material modification and system regulation, this invention addresses the core pain points of existing laundry detergent pods, such as slow low-temperature dissolution rate, untimely release of active ingredients, inability to balance dissolution performance and storage stability, and easy hydrolysis and gelation of the internal system. The invention performs dual grafting modification on the water-soluble film of the laundry detergent pods and simultaneously performs anti-structural treatment on the internal washing system, providing a laundry detergent pod that dissolves rapidly at low temperatures and its preparation method.

[0009] The core concept of this invention is to construct a composite modified water-soluble film with both rapid solubility and excellent moisture resistance by performing dual modification of PVA through maleic anhydride grafting and hydroxypropyl chain extension, thus breaking the technical prejudice that "fast dissolution means poor moisture resistance." Simultaneously, by precisely controlling the ratio of LAS / AES and compounding an anti-structural modifier composed of sodium xylenesulfonate, dibutyl ether, and dipropanol, the formation of vesicle phases, layered phases, and hexagonal gel phases in the internal high surfactant system during hydration is inhibited, thereby simultaneously improving low-temperature solubility from both the "film dissolution" and "material dispersion" dimensions. Ultimately, laundry detergent pods can completely dissolve in 3-8 minutes in a low-temperature water environment of 5-25℃, with an active ingredient release rate ≥95%. Furthermore, they can withstand accelerated storage at 45℃ and 85%RH for 30 days (equivalent to 18 months of room temperature storage) without film breakage, leakage, or clumping. This completely solves the problem of imported laundry detergent pods being unsuitable for domestic low-temperature washing scenarios. Moreover, the preparation process is simple, environmentally friendly, and can be mass-produced and applied.

[0010] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: A low-temperature, rapidly dissolving laundry detergent pod includes a composite modified water-soluble membrane and an anti-structural compound washing system encapsulated within the composite modified water-soluble membrane; the mass ratio of the composite modified water-soluble membrane to the anti-structural compound washing system is 1:(8~15).

[0011] Furthermore, the composite modified water-soluble film is composed of grafted modified PVA, hydroxyethyl cellulose, plasticizer, and moisture-resistant additive in a mass ratio of 100:(5~15):(10~25):(2~8).

[0012] Furthermore, the grafted modified PVA is a polyvinyl alcohol that has been modified by maleic anhydride grafting and hydroxypropyl chain extension, with a degree of alcoholysis of 88%~92%.

[0013] Furthermore, the plasticizer is one or more of glycerol, sorbitol, and maltitol; the moisture-resistant additive is one or two of calcium stearate and zinc palmitate.

[0014] Furthermore, the anti-structuralization compound washing system is composed of anionic surfactant, amphoteric surfactant, nonionic surfactant, hydrophilic active solvent, anti-structuralization modifier, and deionized water in a mass ratio of (30~50):(5~12):(8~18):(15~30):(3~10):(8~14).

[0015] Furthermore, the anionic surfactant is a mixture of LAS and AES, with a mass ratio of 1:(3~6).

[0016] Furthermore, the amphoteric surfactant is one or a combination of two of cocamidopropyl betaine and sodium lauroyl amphoteric acetate; the nonionic surfactant is one or a combination of AEO-9, AEO-7, and fatty alcohol polyoxyethylene ether.

[0017] Further, the hydrophilic active solvent is one or more of glycerol, propylene glycol, and PEG-6; the anti-structural modifier is a compound composed of sodium xylenesulfonate, dibutanol diether, and dipropanol diether in a mass ratio of (1~3):(1~2):(1~2).

[0018] This invention also provides a method for preparing the above-mentioned low-temperature rapid-dissolving laundry detergent pods, comprising the following steps: Preparation of S1 grafted modified PVA: 100 parts by weight of PVA (88%~92% degree of alcoholysis) are mixed with 400~600 parts by weight of deionized water, heated to 85~95℃, and stirred until completely dissolved to obtain an aqueous PVA solution; the temperature is lowered to 60~70℃, and the pH is adjusted to 4.0~5.0 with a 10% hydrochloric acid solution. While maintaining the temperature and stirring, 3~8 parts by weight of maleic anhydride and 0.1~0.3 parts by weight of ammonium persulfate initiator are slowly added, controlling the temperature for 1~2 minutes. The reaction was completed within h, and the reaction was maintained at the temperature for 3-5 h. After the reaction was completed, the pH was adjusted to 6.5-7.5 with 10% sodium hydroxide solution, and then 5-12 parts by mass of propylene oxide (hydroxypropyl reagent) were added. The temperature was raised to 70-80℃ and the reaction was maintained at the temperature for 4-6 h. After the reaction was completed, the mixture was cooled to room temperature, and the reaction solution was transferred to a dialysis bag for dialysis for 24 h to remove unreacted small molecules. Then, it was vacuum dried at 60-70℃ to constant weight and pulverized to obtain grafted modified PVA. Preparation of S2 composite modified water-soluble film by casting: According to the formula, grafted modified PVA and hydroxyethyl cellulose are added to 800-1200 parts by weight of deionized water, heated to 70-80℃, and stirred until completely dissolved to obtain a homogeneous film solution; cooled to 50-60℃, plasticizer and moisture-resistant additive are added, and stirring is continued for 30-60 min, followed by vacuum degassing for 20-30 min; the degassed film solution is uniformly cast on a glass plate, controlling the film thickness to be 35-45 μm, and dried with hot air at 50-60℃ for 2-3 h, and the film is peeled off to obtain the composite modified water-soluble film; Preparation of S3 anti-structuralization compound detergent system: According to the formula, deionized water was added to a stirred tank, and anionic surfactant, amphoteric surfactant, and nonionic surfactant were added in sequence. The mixture was stirred until completely dissolved to obtain a surfactant mixture. The mixture was cooled to room temperature, and hydrophilic active solvent and anti-structuralization modifier were added. The mixture was stirred for 30-45 minutes until the system was uniform and transparent, without bubbles or stratification, to obtain the anti-structuralization compound detergent system. S4 Laundry Detergent Pod Filling and Molding: A composite modified water-soluble film is installed on a fully automatic laundry detergent pod filling machine. Using a heat-sealing molding process, the water-soluble film is first vacuum-formed into a hemispherical groove. A certain amount of anti-structured compound washing system is injected into the groove. Then, another layer of composite modified water-soluble film is covered, and the opening is heat-sealed. The pods are then cut to obtain low-temperature, fast-dissolving laundry detergent pods with a single weight of 8~12g.

[0019] The beneficial effects of this invention are: 1. This invention addresses the low-temperature dissolution challenge from two dimensions: "water-soluble film modification" and "internal system anti-structuralization." The composite water-soluble film constructed through dual-modified PVA completely hydrates and dissolves in 30-60 seconds in a low-temperature water environment of 5-25℃. By controlling the ratio of anti-structuralization modifier to LAS / AES, the formation of a gel structure in the surfactant system during hydration is completely suppressed, allowing the internal material to disperse instantly after dissolving in the water-soluble film. The synergistic effect of these two technologies enables the laundry detergent pods to completely dissolve in 3-8 minutes across the entire low-temperature range of 5-25℃, and achieves an active ingredient release rate of ≥95% in 5 minutes at 20℃ water temperature. This completely solves the industry pain point of imported laundry detergent pods being "unsuitable" for low-temperature scenarios, perfectly adapting to the usage habits of domestic consumers who prefer cold water washing and 8-minute quick washes.

[0020] 2. This invention breaks through the conventional understanding in the field that "hydrophilicity and moisture resistance are mutually exclusive." It introduces hydrophobic groups onto the PVA molecular chain through maleic anhydride grafting, improving moisture resistance; increases the flexibility and hydrophilicity of the molecular chain through hydroxypropyl chain extension, enhancing the low-temperature dissolution rate; and simultaneously combines hydroxyethyl cellulose and moisture-resistant additives to construct a three-dimensional network structure. Ultimately, during storage, the hydrophobic groups effectively isolate external moisture, and the three-dimensional network structure maintains the membrane's mechanical strength. After accelerated storage at 45℃ and 85%RH for 30 days, the water-soluble membrane retains ≥90% of its tensile strength, with no swelling, shrinkage, or leakage. In low-temperature water environments, the hydrophilic groups rapidly bind water molecules, causing the network structure to instantly swell and disintegrate, achieving rapid and complete dissolution, fundamentally resolving a long-standing technical contradiction.

[0021] 3. This invention precisely controls the mass ratio of LAS to AES to be 1:(3~6), adjusting the hydrophilic and lipophilic balance of surfactant molecules and disrupting the conditions for their self-assembly to form complex micelle structures. Simultaneously, it incorporates an anti-structural modifier composed of sodium xylenesulfonate, dibutanol diether, and dipropanol diether. Sodium xylenesulfonate can insert into the spaces between surfactant micelles, reducing their orderliness; dibutanol diether and dipropanol diether can disrupt the hydrogen bonding between water molecules and surfactants, inhibiting gel phase formation. The synergistic effect of these three components ensures that the internal washing system maintains a low-viscosity dispersion state throughout the hydration process, preventing any gel formation and significantly improving the low-temperature dispersion and dissolution rate.

[0022] 4. The dual-modified PVA used in this invention exhibits excellent compatibility with the internal high-concentration surfactant system, preventing surfactant migration into the membrane layer. Simultaneously, the molecular structure and solubility parameters of the composite modified water-soluble membrane have been optimized, significantly improving its compatibility with the washing system. Laundry detergent pods containing the formula of this invention, after 30 days of storage at 40℃ and 75%RH, show no liquid separation, no flocculation or sedimentation, and no membrane breakage or leakage, achieving a product qualification rate of over 99.9%, significantly reducing production losses and after-sales costs.

[0023] This invention uses deionized water as the sole solvent throughout the entire process, without using any organic solvents, resulting in no VOC residues or environmental risks. The reaction conditions are mild, requiring no high-temperature or high-pressure equipment, and can be directly produced using existing laundry detergent pod production lines without additional equipment investment. The production cost is more than 35% lower than that of imported high-end products, making it highly valuable for industrial applications. Detailed Implementation

[0024] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the specific implementation methods, structures, features, and effects of the present invention are described in detail below with reference to embodiments. Unless otherwise specified, the raw materials and reagents used in the present invention are all commercially available daily chemical products; the equipment used is all conventional production and testing equipment in the field.

[0025] Example 1 This embodiment provides a laundry detergent pod that dissolves rapidly at low temperatures, with the following specific formula: Composite modified water-soluble film formulation: 100 parts by weight of grafted modified PVA, 10 parts by weight of hydroxyethyl cellulose, 18 parts by weight of plasticizer (glycerin), 5 parts by weight of moisture-resistant additive (calcium stearate), totaling 133 parts by weight of composite modified water-soluble film. Anti-structuralization compound detergent system formulation: 40 parts by weight of anionic surfactant (8 parts by weight of LAS + 32 parts by weight of AES), 8 parts by weight of amphoteric surfactant (cocamidopropyl betaine), 12 parts by weight of nonionic surfactant (AEO-9), 18 parts by weight of hydrophilic active solvent (10 parts by weight of glycerol + 8 parts by weight of propylene glycol), 6 parts by weight of anti-structuralization modifier (3 parts by weight of sodium xylenesulfonate + 2 parts by weight of dibutanol + 1 part by weight of dipropanol), 12 parts by weight of deionized water, totaling 96 parts by weight of the anti-structuralization compound detergent system; The mass ratio of the composite modified water-soluble membrane to the anti-structured compound washing system is 1:12, which is within the range of 1:(8~15).

[0026] The specific steps of the preparation method of the low-temperature rapid-dissolving laundry detergent pods in this embodiment are as follows: Preparation of S1 grafted modified PVA: 100 parts by mass of PVA (88% alcoholysis) were mixed with 500 parts by mass of deionized water, heated to 90°C, and stirred until completely dissolved to obtain an aqueous PVA solution; the temperature was lowered to 65°C, and the pH was adjusted to 4.5 with 10% hydrochloric acid solution. 5 parts by mass of maleic anhydride and 0.2 parts by mass of ammonium persulfate were slowly added under stirring and maintained at the temperature, with the addition completed within 1.5 hours. After the addition was completed, the reaction was maintained at the temperature for another 4 hours; after the reaction was completed, the pH was adjusted to 7.0 with 10% sodium hydroxide solution, and then 8 parts by mass of propylene oxide were added. The temperature was raised to 75°C and maintained at the temperature for 5 hours; after the reaction was completed, the solution was cooled to room temperature, transferred to a dialysis bag, dialyzed for 24 hours, and then vacuum dried at 65°C to constant weight. The resulting PVA was then pulverized to obtain the grafted modified PVA. Preparation of S2 composite modified water-soluble film by casting: According to the formula, 100 parts by weight of grafted modified PVA and 10 parts by weight of hydroxyethyl cellulose were added to 1000 parts by weight of deionized water, heated to 75°C, and stirred until completely dissolved to obtain a homogeneous film solution; cooled to 55°C, 18 parts by weight of glycerol and 5 parts by weight of calcium stearate were added, and stirring was continued for 45 min, followed by vacuum degassing for 25 min; the degassed film solution was uniformly cast on a glass plate, controlling the film thickness to be 40 μm, and dried with hot air at 55°C for 2.5 h, and the film was peeled off to obtain the composite modified water-soluble film; Preparation of S3 anti-structuralization compound detergent system: According to the formula, 12 parts by mass of deionized water were added to a stirred tank, followed by 8 parts by mass of LAS, 32 parts by mass of AES, 8 parts by mass of cocamidopropyl betaine, and 12 parts by mass of AEO-9. The mixture was stirred until completely dissolved to obtain a surfactant mixture. The mixture was cooled to room temperature, and then 10 parts by mass of glycerol, 8 parts by mass of propylene glycol, 3 parts by mass of sodium xylenesulfonate, 2 parts by mass of dibutanol diether, and 1 part by mass of dipropanol diether were added. The mixture was stirred for 40 minutes until the system was uniform and transparent to obtain the anti-structuralization compound detergent system. S4 Laundry Detergent Pod Filling and Molding: A composite modified water-soluble film is installed on a fully automatic laundry detergent pod filling machine. Using a heat-sealing molding process, the water-soluble film is first vacuum-formed into a hemispherical groove. 9.6g of anti-structured compound washing system is injected into the groove. Then, another layer of composite modified water-soluble film is covered, and the opening is heat-sealed. The pods are then cut to obtain low-temperature rapid-dissolving laundry detergent pods with a single weight of 10.6g.

[0027] Example 2 This embodiment provides a laundry detergent pod that dissolves rapidly at low temperatures, with the following specific formula: Composite modified water-soluble film formulation: 100 parts by weight of grafted modified PVA, 7 parts by weight of hydroxyethyl cellulose, 15 parts by weight of plasticizer (sorbitol), 3 parts by weight of moisture-resistant additive (zinc palmitate), totaling 125 parts by weight of composite modified water-soluble film. Anti-structuralization compound detergent system formulation: 42 parts by weight of anionic surfactant (7 parts by weight of LAS + 35 parts by weight of AES), 6 parts by weight of amphoteric surfactant (sodium lauroamphoacetate), 10 parts by weight of nonionic surfactant (AEO-7), 18 parts by weight of hydrophilic active solvent (12 parts by weight of PEG-6 + 6 parts by weight of glycerol), 4 parts by weight of anti-structuralization modifier (2 parts by weight of sodium xylenesulfonate + 1 part by weight of dibutanol + 1 part by weight of dipropanol), 10 parts by weight of deionized water, totaling 90 parts by weight of the anti-structuralization compound detergent system; The mass ratio of the composite modified water-soluble membrane to the anti-structured compound washing system is 1:13.8, which is within the range of 1:(8~15).

[0028] The specific steps of the preparation method of the low-temperature rapid-dissolving laundry detergent pods in this embodiment are as follows: Preparation of S1 grafted modified PVA: 100 parts by mass of PVA (90% alcoholysis) were mixed with 450 parts by mass of deionized water, heated to 88℃, and stirred until completely dissolved to obtain an aqueous PVA solution; the temperature was lowered to 62℃, and the pH was adjusted to 4.2 with 10% hydrochloric acid solution. 4 parts by mass of maleic anhydride and 0.15 parts by mass of ammonium persulfate were slowly added under stirring and maintained at the temperature, with the addition completed within 1 hour. After the addition was completed, the reaction was maintained at the temperature for 3.5 hours; after the reaction was completed, the pH was adjusted to 6.8 with 10% sodium hydroxide solution, and then 6 parts by mass of propylene oxide were added. The temperature was raised to 72℃ and maintained at the temperature for 4.5 hours; after the reaction was completed, the mixture was cooled to room temperature, dialyzed for 24 hours, and vacuum dried at 62℃ to constant weight. The resulting PVA was then pulverized to obtain the grafted modified PVA. Preparation of S2 composite modified water-soluble film by casting: According to the formula, 100 parts by weight of grafted modified PVA and 7 parts by weight of hydroxyethyl cellulose were added to 900 parts by weight of deionized water, heated to 72℃ and stirred until completely dissolved; cooled to 52℃, 15 parts by weight of sorbitol and 3 parts by weight of zinc palmitate were added, and stirring was continued for 35 min, followed by vacuum degassing for 20 min; the film was cast and the thickness was controlled to be 38 μm, dried with hot air at 52℃ for 2 h, and the film was peeled off to obtain the composite modified water-soluble film; Preparation of S3 anti-structuralization compound detergent system: According to the formula, 10 parts by mass of deionized water were added to a stirred tank, followed by 7 parts by mass of LAS, 35 parts by mass of AES, 6 parts by mass of sodium lauroamphoacetate, and 10 parts by mass of AEO-7. The mixture was stirred until completely dissolved. The mixture was cooled to room temperature, and then 12 parts by mass of PEG-6, 6 parts by mass of glycerol, 2 parts by mass of sodium xylenesulfonate, 1 part by mass of dibutanol diether, and 1 part by mass of dipropanol diether were added. The mixture was stirred for another 35 minutes to obtain a uniform and transparent anti-structuralization compound detergent system. S4 Laundry Detergent Pod Filling and Molding: Same as Example 1, with a single laundry detergent pod weighing 10.0g.

[0029] Example 3 This embodiment provides a laundry detergent pod that dissolves rapidly at low temperatures, with the following specific formula: Composite modified water-soluble film formulation: 100 parts by weight of grafted modified PVA, 13 parts by weight of hydroxyethyl cellulose, 22 parts by weight of plasticizer (maltitol), 6 parts by weight of moisture-resistant additive (3 parts by weight of calcium stearate + 3 parts by weight of zinc palmitate), totaling 141 parts by weight of composite modified water-soluble film. Anti-structuralization compound detergent system formulation: 40 parts by weight of anionic surfactant (LAS 10 parts by weight + AES 30 parts by weight), 10 parts by weight of amphoteric surfactant (cocamidopropyl betaine 5 parts by weight + sodium lauroyl amphoteric acetate 5 parts by weight), 14 parts by weight of nonionic surfactant (AEO-98 parts by weight + AEO-76 parts by weight), 16 parts by weight of hydrophilic active solvent (propylene glycol 9 parts by weight + PEG-67 parts by weight), 8 parts by weight of anti-structuralization modifier (sodium xylenesulfonate 4 parts by weight + dibutanol diether 2 parts by weight + dipropanol diether 2 parts by weight), 14 parts by weight of deionized water, totaling 102 parts by weight of the anti-structuralization compound detergent system; The mass ratio of the composite modified water-soluble membrane to the anti-structured compound washing system is 1:10.1, which is within the range of 1:(8~15).

[0030] The specific steps of the preparation method of the low-temperature rapid-dissolving laundry detergent pods in this embodiment are as follows: Preparation of S1 grafted modified PVA: 100 parts by mass of PVA (92% degree of alcoholysis) were mixed with 550 parts by mass of deionized water, heated to 92°C, and stirred until completely dissolved to obtain an aqueous PVA solution; the temperature was lowered to 68°C, and the pH was adjusted to 4.8 with 10% hydrochloric acid solution. 7 parts by mass of maleic anhydride and 0.25 parts by mass of ammonium persulfate were slowly added under stirring and maintained at the temperature, with the addition completed within 2 hours. After the addition was completed, the reaction was maintained at the temperature for 4.5 hours. After the reaction was completed, the pH was adjusted to 7.2 with 10% sodium hydroxide solution, and then 10 parts by mass of propylene oxide were added. The temperature was raised to 78°C and maintained at the temperature for 5.5 hours. After the reaction was completed, the mixture was cooled to room temperature, dialyzed for 24 hours, and vacuum dried at 68°C to constant weight. The resulting PVA was then pulverized to obtain the grafted modified PVA. Preparation of S2 composite modified water-soluble film by casting: According to the formula, 100 parts by weight of grafted modified PVA and 13 parts by weight of hydroxyethyl cellulose were added to 1100 parts by weight of deionized water, heated to 78°C, and stirred until completely dissolved; cooled to 58°C, 22 parts by weight of maltitol, 3 parts by weight of calcium stearate and 3 parts by weight of zinc palmitate were added, and stirring was continued for 55 min, followed by vacuum degassing for 30 min; the film was cast and the thickness was controlled to be 42 μm, dried with hot air at 58°C for 3 h, and the film was peeled off to obtain the composite modified water-soluble film; Preparation of S3 anti-structuralization compound detergent system: According to the formula, 14 parts by weight of deionized water were added to a stirred tank, followed by 10 parts by weight of LAS, 30 parts by weight of AES, 5 parts by weight of cocamidopropyl betaine, 5 parts by weight of sodium lauroylamphoacetate, 8 parts by weight of AEO-9, and 6 parts by weight of AEO-7. The mixture was stirred until completely dissolved. The mixture was cooled to room temperature, and then 9 parts by weight of propylene glycol, 7 parts by weight of PEG-6, 4 parts by weight of sodium xylenesulfonate, 2 parts by weight of dibutanol diether, and 2 parts by weight of dipropanol diether were added. The mixture was stirred for 45 minutes to obtain a uniform and transparent anti-structuralization compound detergent system. S4 Laundry Detergent Pods Filling and Molding: Same as Example 1, with a single laundry detergent pod weighing 11.2g.

[0031] Example 4 This embodiment provides a laundry detergent pod that dissolves rapidly at low temperatures, with the following specific formula: Composite modified water-soluble film formulation: 100 parts by weight of grafted modified PVA, 5 parts by weight of hydroxyethyl cellulose, 20 parts by weight of plasticizer (10 parts by weight of glycerin + 10 parts by weight of sorbitol), 2 parts by weight of moisture-resistant additive (calcium stearate), totaling 127 parts by weight of composite modified water-soluble film. Anti-structuralization compound detergent system formulation: 36 parts by weight of anionic surfactant (6 parts by weight of LAS + 30 parts by weight of AES), 12 parts by weight of amphoteric surfactant (cocamidopropyl betaine), 18 parts by weight of nonionic surfactant (AEO-9), 15 parts by weight of hydrophilic active solvent (15 parts by weight of glycerol), 3 parts by weight of anti-structuralization modifier (1 part by weight of sodium xylenesulfonate + 1 part by weight of dibutanol + 1 part by weight of dipropanol), 8 parts by weight of deionized water, totaling 92 parts by weight of the anti-structuralization compound detergent system; The mass ratio of the composite modified water-soluble membrane to the anti-structured compound washing system is 1:13.6, which is within the range of 1:(8~15).

[0032] The specific steps of the preparation method of the low-temperature rapid-dissolving laundry detergent pods in this embodiment are as follows: Preparation of S1 grafted modified PVA: Same as in Example 1; Preparation of S2 composite modified water-soluble film by casting: Prepare film solution according to the formula amount, cast film, film thickness 35μm; Preparation of S3 anti-structural compound detergent system: Mix each component according to the formula amount and stir evenly; S4 Laundry Detergent Pod Filling and Molding: Same as Example 1, with a single laundry detergent pod weighing 10.1g.

[0033] Example 5 This embodiment provides a laundry detergent pod that dissolves rapidly at low temperatures, with the following specific formula: Composite modified water-soluble film formulation: 100 parts by weight of grafted modified PVA, 15 parts by weight of hydroxyethyl cellulose, 25 parts by weight of plasticizer (glycerin), 8 parts by weight of moisture-resistant additive (zinc palmitate), totaling 148 parts by weight of composite modified water-soluble film. Anti-structuralization compound detergent system formulation: 50 parts by weight of anionic surfactant (8 parts by weight of LAS + 2 parts by weight of AES), 5 parts by weight of amphoteric surfactant (sodium lauroamphoacetate), 8 parts by weight of nonionic surfactant (AEO-7), 20 parts by weight of hydrophilic active solvent (10 parts by weight of propylene glycol + 10 parts by weight of PEG-6), 10 parts by weight of anti-structuralization modifier (5 parts by weight of sodium xylenesulfonate + 3 parts by weight of dibutanol + 2 parts by weight of dipropanol), 13 parts by weight of deionized water, totaling 106 parts by weight of the anti-structuralization compound detergent system; The mass ratio of the composite modified water-soluble membrane to the anti-structured compound washing system is 1:8.6, which is within the range of 1:(8~15).

[0034] The specific steps of the preparation method of the low-temperature rapid-dissolving laundry detergent pods in this embodiment are as follows: Preparation of S1 grafted modified PVA: Same as in Example 3; Preparation of S2 composite modified water-soluble film by casting: Prepare film solution according to the formula amount, cast film, film thickness 45μm; Preparation of S3 anti-structural compound detergent system: Mix each component according to the formula amount and stir evenly; S4 Laundry Detergent Pod Filling and Molding: Same as Example 1, with a single laundry detergent pod weighing 11.5g.

[0035] Comparative Example 1 Ordinary unmodified PVA was used to completely replace the grafted modified PVA in Example 1, and the rest of the formulation and preparation steps were completely consistent with Example 1; Comparative Example 2 PVA modified only by maleic anhydride grafting was used instead of the grafted modified PVA in Example 1, without the hydroxypropyl chain extension step. The rest of the formulation and preparation steps were completely consistent with Example 1. Comparative Example 3 The PVA modified by hydroxypropyl chain extension only was used, without the maleic anhydride grafting step, to replace the grafted modified PVA in Example 1. The rest of the formulation and preparation steps were completely consistent with Example 1. Comparative Example 4 No moisture-resistant additives were added to the composite modified water-soluble film; the rest of the formulation and preparation steps were completely consistent with those in Example 1. Comparative Example 5 No anti-structural modifier was added to the anti-structural compound washing system; the rest of the formulation and preparation steps were completely consistent with those in Example 1. Comparative Example 6 The mass ratio of LAS to AES in the anti-structured compound washing system is 1:2, which exceeds the 1:(3~6) limit of this invention. The rest of the formulation and preparation steps are completely consistent with Example 1. Comparative Example 7 The mass ratio of LAS to AES in the anti-structured compound washing system is 1:7, which exceeds the 1:(3~6) limit of this invention. The rest of the formulation and preparation steps are completely consistent with Example 1. Comparative Example 8 The anti-structuralization modifier uses only sodium xylenesulfonate, without adding dibutanol and dipropanol; the rest of the formulation and preparation steps are completely consistent with Example 1. Comparative Example 9 The mass ratio of the composite modified water-soluble membrane to the anti-structured compound washing system is 1:6, which means that the amount of membrane used is too much. The rest of the formulation and preparation steps are completely consistent with those in Example 1. Comparative Example 10 The mass ratio of the composite modified water-soluble membrane to the anti-structural compound washing system is 1:18, which means that the amount of membrane used is too small. The rest of the formulation and preparation steps are completely consistent with those in Example 1.

[0036] Performance testing To comprehensively verify the performance of the embodiments and comparative examples of the present invention, the present invention has formulated detailed testing methods. All tests were performed in parallel three times, and the average value was taken. The testing methods and results are as follows: I. Detection Methods 1. Low-temperature complete dissolution time detection 10L of deionized water at 5℃, 10℃, 20℃, and 25℃ were placed in a standard vertical washing machine. The stirring speed was set to 100r / min to simulate the low-speed stirring state of a household washing machine. One laundry detergent pod to be tested was put into the water and the timer was started. The turbidity of the solution was monitored in real time using an online turbidity meter. When the turbidity of the solution was stable and there were no visible insoluble substances, it was determined to be completely dissolved. The time required for complete dissolution was recorded. At the same time, it was observed whether there was any clumping of packaging materials during the dissolution process.

[0037] 2. Low-temperature active ingredient release rate detection High-performance liquid chromatography (HPLC) was used for detection, with AES as the target analyte. One laundry detergent pod was added to 10 L of deionized water at 20°C and stirred at 100 rpm. Samples of 10 mL were taken at 3 min, 5 min, and 8 min, respectively. The AES content in the solution was determined by HPLC, and the total AES content in the laundry detergent pod was also determined. The active ingredient release rate was calculated using the following formula: Release rate (%) = (AES content in the solution at the sampling time point / Total AES content in the laundry detergent pods) × 100% 3. Storage stability and moisture resistance testing Ten laundry detergent pods to be tested were placed in a sealed plastic box and placed in a constant temperature and humidity incubator at 45°C and 85% relative humidity for accelerated storage for 30 days (equivalent to 18 months of storage at room temperature). After completion, the following tests were performed: (1) Appearance changes: Visually inspect whether the laundry detergent pods show abnormal phenomena such as swelling, shrinkage, leakage, liquid separation, or clumping of the water-soluble film; (2) Tensile strength retention rate of water-soluble film: Take laundry detergent pods after accelerated storage, carefully peel off the intact water-soluble film, and test its tensile strength using a universal tensile testing machine. Compare with the blank sample without storage, and calculate the tensile strength retention rate according to the following formula: Tensile strength retention rate (%) = (Tensile strength of aqueous film after accelerated storage / Tensile strength of aqueous film in blank sample) × 100% (3) Retention rate of active ingredients: The total content of AES in the laundry detergent pods after accelerated storage was detected by HPLC and compared with the initial content to calculate the retention rate of active ingredients.

[0038] 4. Quantitative detection of packaging material clumping Add one laundry detergent pod to 10L of deionized water at 10℃, stir at 100r / min for 5min, then filter the entire solution through a 200-mesh standard sieve, collect the residue on the sieve, dry it at 105℃ to constant weight, and weigh the residue. The residue mass is the packaging material agglomeration mass. The lower the agglomeration mass, the better the dispersibility of the packaging material.

[0039] 5. Detergent residue rate test A vertical household washing machine was used, set to the cold water quick wash mode (water temperature 20℃, washing time 8 minutes, 2 rinses, 2 minutes spin-drying). 1 kg of standard pure cotton fabric was placed in the machine, along with one laundry detergent pod to be tested. After the washing cycle was completed, all washing and rinsing wastewater was collected, and the AES content in the wastewater was detected using HPLC. Simultaneously, the washed fabric was collected, and any residual AES on the fabric was extracted using Soxhlet extraction. The total residual rate was calculated using the following formula: Residual rate (%) = (AES content in wastewater + AES content remaining on fabric) / Total AES content in laundry pods × 100%.

[0040] 6. Cleaning power test The test was conducted according to GB / T13174-2021 "Determination of detergency and recycle performance of detergents for clothing". Standard soiled cloths (carbon black oil soiled cloth, protein soiled cloth, and sebum soiled cloth) were used to calculate the detergency ratio. The higher the detergency ratio, the better the cleaning power.

[0041] II. Test Results Table 1. Complete dissolution time and packaging material agglomeration at different water temperatures for each embodiment and comparative example. Example 1 7.5 5.2 3.8 3.1 No clumps 0.8 Example 2 8.0 5.6 4.1 3.3 No clumps 1.2 Example 3 6.8 4.7 3.5 2.9 No clumps 0.5 Example 4 7.8 5.4 4.0 3.2 No clumps 1.0 Example 5 7.2 4.9 3.6 3.0 No clumps 0.7 Comparative Example 1 ＞30 22.5 15.3 12.6 Large amount of clumps 125.6 Comparative Example 2 18.6 12.3 8.5 7.2 Small amount of clumps 32.4 Comparative Example 3 15.2 9.8 6.5 5.3 Slight caking 15.8 Comparative Example 4 7.6 5.3 3.9 3.2 No clumps 0.9 Comparative Example 5 16.5 11.2 7.8 6.5 No clumps 1.1 Comparative Example 6 12.3 8.5 5.6 4.8 No clumps 1.0 Comparative Example 7 14.8 10.2 6.9 5.7 No clumps 1.3 Comparative Example 8 10.5 7.2 4.8 4.1 No clumps 0.9 Comparative Example 9 12.5 8.2 5.3 4.5 Small amount of clumps 28.7 Comparative Example 10 7.3 5.1 3.7 3.0 No clumps 0.8 Table 2. Active ingredient release rates at different times under water temperature of 20°C for each example and comparative example. Example 1 78.5 96.2 99.5 Example 2 75.3 95.1 99.3 Example 3 81.2 97.5 99.7 Example 4 76.8 95.6 99.4 Example 5 79.6 96.8 99.6 Comparative Example 1 12.5 28.6 45.3 Comparative Example 2 25.6 52.3 78.5 Comparative Example 3 32.5 65.8 85.2 Comparative Example 4 77.2 95.8 99.4 Comparative Example 5 28.3 58.6 82.3 Comparative Example 6 45.2 72.5 90.6 Comparative Example 7 38.6 65.3 86.8 Comparative Example 8 52.3 78.6 92.5 Comparative Example 9 42.5 68.9 88.7 Comparative Example 10 79.1 96.5 99.5 Table 3. Stability and moisture resistance results of each example and comparative example after 30 days of accelerated storage. Example 1 No swelling, no shrinkage, no membrane rupture or leakage, no stratification 92.3 98.7 Example 2 No swelling, no shrinkage, no membrane rupture or leakage, no stratification 91.5 98.4 Example 3 No swelling, no shrinkage, no membrane rupture or leakage, no stratification 93.6 98.9 Example 4 No swelling, no shrinkage, no membrane rupture or leakage, no stratification 90.8 98.2 Example 5 No swelling, no shrinkage, no membrane rupture or leakage, no stratification 92.8 98.6 Comparative Example 1 Severe swelling, shrinkage, 3 membrane ruptures and leakage, and separation of feed liquid. 35.2 82.5 Comparative Example 2 Slight swelling, no membrane rupture or leakage, no stratification 72.5 92.3 Comparative Example 3 Significant swelling, one membrane ruptured and leaked liquid, slight stratification. 58.6 85.6 Comparative Example 4 Significant swelling, two membrane ruptures and leakage, no stratification. 65.3 91.8 Comparative Example 5 No swelling, no shrinkage, no membrane rupture or leakage, no stratification 91.7 98.5 Comparative Example 6 No swelling, no shrinkage, no membrane rupture or leakage, no stratification 92.1 98.3 Comparative Example 7 No swelling, no shrinkage, no membrane rupture or leakage, no stratification 91.9 98.1 Comparative Example 8 No swelling, no shrinkage, no membrane rupture or leakage, no stratification 92.0 98.4 Comparative Example 9 No swelling, no shrinkage, no membrane rupture or leakage, no stratification 93.2 98.8 Comparative Example 10 Slight swelling, 4 membrane ruptures and leakage, and separation of feed and liquid. 78.6 88.5 Table 4. Results of washing residue rate and cleaning power for each example and comparative example. Example 1 0.45 1.32 1.28 1.35 Example 2 0.58 1.29 1.25 1.32 Example 3 0.32 1.35 1.31 1.38 Example 4 0.52 1.30 1.26 1.33 Example 5 0.38 1.33 1.29 1.36 Comparative Example 1 55.6 0.65 0.58 0.62 Comparative Example 2 22.3 0.88 0.75 0.82 Comparative Example 3 15.8 0.95 0.82 0.89 Comparative Example 4 0.51 1.31 1.27 1.34 Comparative Example 5 18.5 0.92 0.79 0.86 Comparative Example 6 9.6 1.12 1.05 1.08 Comparative Example 7 13.2 1.05 0.98 1.02 Comparative Example 8 7.8 1.18 1.10 1.15 Comparative Example 9 11.5 1.08 1.02 1.05 Comparative Example 10 0.48 1.32 1.27 1.34 III. Analysis of Test Results 1. Low-temperature solubility and release performance analysis Examples 1-5 show that the complete dissolution time is controlled within the low temperature range of 5-25℃, and the release rate of active ingredients is ≥95% after 5 minutes at 20℃ water temperature. There is no clumping of packaging materials during the dissolution process. After stirring at 10℃ for 5 minutes, the residual mass of clumped packaging materials is ≤1.2mg, which fully meets the design goals of this invention and is perfectly adapted to the domestic cold water fast washing scenario.

[0042] The core technical innovation of this invention can be verified by comparing the comparative examples and embodiments: Comparative Example 1 uses unmodified ordinary PVA water-soluble membrane. The low-temperature dissolution time exceeds 20 minutes, and a large amount of packaging material agglomerates. The release rate is less than 30% after 5 minutes, which proves that the dual grafting modification of PVA is the core basis for achieving low-temperature rapid dissolution and agglomeration-free dispersion of water-soluble membrane. Comparative Example 2 used only maleic anhydride grafting modification, and Comparative Example 3 used only hydroxypropyl chain extension modification. The low-temperature dissolution time of both exceeded 8 minutes, and there was varying degrees of packaging material agglomeration. This proves that the dual modification of maleic anhydride grafting and hydroxypropyl chain extension is indispensable. Only through the synergistic effect of the two can excellent low-temperature solubility and dispersibility be achieved simultaneously. Comparative Example 5, without the addition of anti-structural modifier, although the water-soluble film dissolved quickly, the internal system formed a gel, which greatly prolonged the overall dissolution time. The release rate was less than 60% in 5 minutes, proving that the anti-structural modifier is the key to achieving rapid dispersion of the internal material. The LAS / AES ratios of Comparative Examples 6 and 7 exceeded the limits of this invention, and the dissolution time and release rate both decreased significantly, demonstrating that precise control of the LAS / AES ratio is crucial for inhibiting structural architecture and improving low-temperature dissolution performance. Comparative Example 8 used only a single anti-structural modifier, and its performance was not as good as the compound system, proving that sodium xylenesulfonate, dibutanol diether, and dipropanol diether have a synergistic anti-structural effect. 2. Storage stability and moisture resistance analysis Examples 1-5, after being stored under high temperature and high humidity for 30 days, showed no abnormal phenomena such as swelling, shrinkage, film rupture and leakage, or material separation. The tensile strength retention rate of the water-soluble film was ≥90%, and the retention rate of active ingredients was ≥98%, demonstrating extremely excellent storage stability and moisture resistance, fully meeting the shelf life requirements of more than 18 months for daily chemical products.

[0043] Comparative analysis can verify that: Comparative Example 3 only used hydroxypropyl chain extension modification without maleic anhydride hydrophobic grafting. After storage, it showed obvious swelling and film rupture and leakage, and the tensile strength retention rate was only 58.6%. This proves that the hydrophobic group introduced by maleic anhydride grafting is the core to improve the moisture resistance and storage stability of the water-soluble film. Comparative Example 4, without the addition of moisture-resistant additives, showed swelling and leakage after storage, proving that moisture-resistant additives can further improve the moisture resistance of the composite water-soluble membrane. Comparative Example 10 showed that the membrane was used in too small a quantity and leaked after storage, proving that the core-to-wall ratio range of 1:(8~15) defined in this invention is a key parameter to ensure storage stability. Comparative Example 9 showed excessive membrane usage. Although the storage stability was good, the dissolution time was prolonged and a small amount of packaging material agglomeration occurred, further verifying the rationality of the core-to-wall ratio range.

[0044] 3. Analysis of Detergent Residue and Cleaning Power After washing, the total residue rate of Examples 1-5 was ≤0.6%, with almost no residue. The active ingredients were completely released, avoiding waste of raw materials and environmental pollution. At the same time, the stain removal ratio was ≥1.25, far exceeding the national standard requirement (≥1.0), demonstrating excellent cleaning performance.

[0045] Comparative Examples 1-3 and 5-8 all had residue rates exceeding 7%, indicating a significant amount of detergent components remained unreleased. This not only resulted in a loss of efficacy but also posed risks of residue on clothing and skin sensitization. Comparative Example 9 used excessive film, leading to some packaging material residue and reduced cleaning power. These results fully demonstrate that this invention, through dual-dimensional technological innovation, achieves a perfect combination of low-temperature rapid dissolution and highly efficient cleaning.

[0046] In summary, this invention constructs a composite water-soluble membrane through double grafting modification of PVA, and optimizes the internal washing system by controlling the ratio of anti-structural modifier and LAS / AES. This completely breaks the technical prejudice in the field that "fast dissolution leads to poor moisture resistance," and solves the two core problems of "slow dissolution of water-soluble membrane" and "hydration gelation of internal system." All performance aspects far exceed those of existing commercially available products and existing technical solutions, demonstrating outstanding substantive features and significant progress, and possessing extremely strong creative and industrial application value.

[0047] 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-disclosed 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 type of laundry detergent pod that dissolves rapidly at low temperatures, characterized in that, It includes a composite modified water-soluble membrane and an anti-structured compound washing system encapsulated inside the composite modified water-soluble membrane; the mass ratio of the composite modified water-soluble membrane to the anti-structured compound washing system is 1:(8~15).

2. The low-temperature, rapidly dissolving laundry detergent pods according to claim 1, characterized in that, The composite modified water-soluble membrane is composed of grafted modified PVA, hydroxyethyl cellulose, plasticizer, and moisture-resistant additive in a mass ratio of 100:(5~15):(10~25):(2~8).

3. The low-temperature, rapidly dissolving laundry detergent pods according to claim 2, characterized in that, The grafted modified PVA is a polyvinyl alcohol with maleic anhydride grafting and hydroxypropyl chain extension, and the degree of alcoholysis is 88%~92%.

4. The low-temperature, rapidly dissolving laundry detergent pods according to claim 2, characterized in that, The plasticizer is one or a combination of glycerol, sorbitol, and maltitol; the moisture-resistant additive is one or a combination of calcium stearate and zinc palmitate.

5. The low-temperature, rapidly dissolving laundry detergent pods according to claim 1, characterized in that, The anti-structuralization compound washing system is composed of anionic surfactant, amphoteric surfactant, nonionic surfactant, hydrophilic active solvent, anti-structuralization modifier, and deionized water in a mass ratio of (30~50):(5~12):(8~18):(15~30):(3~10):(8~14).

6. The low-temperature, rapidly dissolving laundry detergent pods according to claim 5, characterized in that, The anionic surfactant is a mixture of LAS and AES, with a mass ratio of 1:(3~6).

7. The low-temperature, rapidly dissolving laundry detergent pods according to claim 5, characterized in that, The anti-structuralization modifier is a compound composed of sodium xylenesulfonate, dibutanol diether, and dipropanol diether in a mass ratio of (1~3):(1~2):(1~2).

8. A method for preparing a low-temperature, rapidly dissolving laundry detergent pod as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Preparation of S1 grafted modified PVA; Preparation of S2 composite modified water-soluble film by casting; Preparation of S3 anti-structured compound detergent system; S4 laundry detergent pods are filled and molded.

9. The preparation method according to claim 8, characterized in that, The preparation of grafted modified PVA in step S1 is as follows: PVA is mixed with deionized water to prepare an aqueous PVA solution, the pH is adjusted to weakly acidic, maleic anhydride is added after heating to carry out the grafting reaction, the pH is adjusted to neutral after the reaction is completed, and then hydroxypropyl reagent is added to carry out chain extension modification. After the reaction is completed, the PVA is obtained by dialysis and drying.

10. The preparation method according to claim 8, characterized in that, The preparation of the anti-structuralization compound washing system in step S3 is as follows: anionic surfactant, amphoteric surfactant, and nonionic surfactant are added sequentially to deionized water and stirred until completely dissolved. The mixture is then cooled to room temperature, and a hydrophilic active solvent and an anti-structuralization modifier are added. The mixture is stirred until it is uniform and transparent to obtain the anti-structuralization compound washing system.