A concentrated laundry condensation bead special for silk and wool and a preparation method thereof

Abstract

The present application relates to a kind of concentrated washing condensation beads special for silk and hair and its preparation method, the concentrated washing condensation beads special for silk and hair, including the following components: modified organosilicon surfactant, modified alkyl amide imidazoline quaternary ammonium salt, cocamide propyl hydroxyl sulfobetaine, lauryl alcohol EO / PO block polyether, nonionic surfactant, auxiliary, neutralizing agent, solvent;Wherein, the modified alkyl amide imidazoline quaternary ammonium salt is first fatty acid, diethylene triamine is acylated under high temperature, negative pressure cyclization, then quaternary ammonium salt is obtained by dimethyl sulfate;The modified organosilicon surfactant is obtained by the blending reaction of low hydrogen-containing silicone oil, 1-octadecene, allyl polyethylene glycol.This concentrated washing condensation beads special for silk and hair has good stability, decontamination performance, antistatic performance, softness, and has good application prospect.

Description

Technical Field

[0001] This invention relates to the field of detergent technology, and in particular to a concentrated laundry detergent pod specifically for silk and wool, and its preparation method. Background Technology

[0002] Silk and wool are natural protein fibers with a delicate and fragile structure. They are extremely sensitive to the pH of the washing system, the type of surfactant, and residual substances. Improper washing can easily lead to fiber damage, loss of luster, dryness, static electricity, discoloration, yellowing, and wrinkles. Therefore, silk washing and care must strictly adhere to a specialized washing system that is weakly acidic, low-irritant, and has softening and anti-static properties. Ordinary household laundry detergents, soap-based detergents, and highly anionic detergents are not suitable for the long-term care needs of silk and wool fabrics.

[0003] Currently, most commercially available silk and wool detergents are low-activity diluted formulas, which have drawbacks such as low effective ingredient content, high storage and transportation costs, large packaging material consumption, and poor low-carbon and environmental friendliness. Existing concentrated silk and wool washing and care formulas mostly use anionic and nonionic systems, with a slightly alkaline formula system, and commonly add linear alkylbenzene sulfonate (LAS), soap base, and protease. Long-term washing can easily cause silk and wool fabrics to harden in feel, lose luster, and even cause damage and deformation.

[0004] The existing publicly available imidazoline quaternary ammonium salt and betaine compound softening systems are mostly simple binary physical mixing modes, which rely solely on the double-layer coating structure to achieve basic softening effects. They suffer from limited compatibility stability, poor stain removal effect, insufficient film uniformity, and poor fabric hand feel, making it difficult to meet the technical requirements of high-concentration, long-lasting fiber protection, softening and antistatic high-end silk and wool concentrated detergent products.

[0005] Therefore, there is an urgent need to develop a concentrated laundry detergent pod specifically for silk and wool that has good cleaning effect and excellent softening function, in order to solve the problems of existing technology and meet the current market demand. Summary of the Invention

[0006] Based on this, the present invention provides a concentrated laundry detergent pod specifically for silk and wool, overcoming the shortcomings of existing technologies. This technical solution overcomes the limitations of traditional binary formulation systems of imidazoline quaternary ammonium salts and betaine by constructing a ternary molecularly oriented "core-shell-membrane" microstructure, achieving high concentration, high stability, and ease of use. Simultaneously, it integrates multiple functions such as efficient cleaning and stain removal, fabric softening, and long-lasting antistatic properties, meeting the refined washing and care needs of high-end silk and wool fabrics.

[0007] The purpose of this invention is to provide a concentrated laundry detergent pod specifically for silk and wool, wherein the concentrated laundry detergent pod for silk and wool comprises the following components in weight fractions: Modified organosilicon surfactant 1-5% Modified alkylamide imidazoline quaternary ammonium salt 1-6% Cocamidopropyl hydroxysulfonate 1-8% Lauryl alcohol EO / PO block polyether 2-15% Nonionic surfactants 40-60% Additives 0.1-5% Neutralizing agent 0.1-2% Solvent balance; in, The modified alkylamide imidazoline quaternary ammonium salt is obtained by first subjecting fatty acids and diethylenetriamine to high-temperature amidation and negative pressure cyclization, followed by quaternization with dimethyl sulfate. The modified organosilicon surfactant is obtained by blending low-hydrogen silicone oil, 1-octadecene, and allyl polyethylene glycol.

[0008] Furthermore, the nonionic surfactant is selected from one or more of fatty alcohol polyoxyethylene ethers, fatty alcohol alkoxylates, fatty acid ethoxylates, fatty acid alkylolamides, alkyl polyglycosides, fatty acid methyl ester ethoxylates, and oil ethoxylates.

[0009] Furthermore, the additives are selected from one or more of the following: fragrances, preservatives, anti-redeposition agents, chelating agents, pigments, and inorganic salts.

[0010] Further, the solvent is selected from one or more of deionized water, ethanol, glycerol, propylene glycol, sorbitol, polyethylene glycol, diethylene glycol butyl ether, dipropylene glycol methyl ether, tripropylene glycol methyl ether, diethylene glycol butyl ether acetate, dipropylene glycol butyl ether, and tripropylene glycol butyl ether.

[0011] Furthermore, the neutralizing agent is selected from one or more of citric acid, sodium citrate, lactic acid, sodium lactate, malic acid, sodium malate, tartaric acid, and sodium tartrate.

[0012] Another object of the present invention is to provide a method for preparing the concentrated laundry detergent pods specifically for silk and wool, the method comprising the following steps: S1. Low-hydrogen silicone oil, 1-octadecene, allyl polyethylene glycol, and catalyst are blended and heated and stirred to obtain a modified organosilicon surfactant. S2. Under an inert atmosphere, fatty acids and diethylenetriamine are blended and heated to react, yielding a dialkylamide amine intermediate. S3. Under vacuum conditions, the dialkylamide amine intermediate is heated to obtain an alkylamide imidazoline tertiary amine intermediate; S4. The alkylamide imidazoline tertiary amine intermediate and dimethyl sulfate are mixed and heated to obtain the modified alkylamide imidazoline quaternary ammonium salt. S5. The modified organosilicon surfactant is blended with the remaining components to obtain the contents; S6. Package the contents to obtain the concentrated laundry detergent pods specifically for silk and wool.

[0013] Further, in step S1, the mass ratio of the low-hydrogen silicone oil, 1-octadecene, and allyl polyethylene glycol is (40-60):(3-8):(1-15).

[0014] Furthermore, in step S1, the reaction time is 2-5 hours.

[0015] Furthermore, in step S1, the heating temperature is 80-120°C.

[0016] Furthermore, in step S2, the reaction time is 2-4 hours.

[0017] Furthermore, in step S4, the reaction time is 2-4 hours.

[0018] The concentrated laundry detergent pods for silk and wool described in this invention have a stable pH value controlled between 5.0 and 7.0, which matches the acid and alkali tolerance range of natural silk protein fibers. This effectively protects the fiber peptide chains and disulfide bond structure, preventing problems such as brittleness, loss of luster, and discoloration of silk during washing.

[0019] The present invention has the following beneficial effects: This invention provides a concentrated laundry detergent pod specifically for silk and wool, and a method for preparing the same. The concentrated laundry detergent pod for silk and wool includes modified organosilicon surfactant, modified alkylamide imidazoline quaternary ammonium salt, cocamidopropyl hydroxysulfonate betaine, and other components. The modified organosilicon surfactant is obtained by blending low-hydrogen silicone oil, 1-octadecene, and allyl polyethylene glycol, followed by a hydrosilylation reaction.

[0020] The modified organosilicon surfactant of this invention incorporates long alkyl chains, hydroxyl groups, and ether bonds. The long alkyl chains possess lipophilic properties and high affinity for oily dirt, enhancing their emulsifying, solubilizing, and encapsulating abilities, thereby improving detergency. This facilitates the spread of components on the surface of fibers, helping to form a continuous conductive water layer, improving the product's antistatic effect. They also fill the gaps between cationic molecules, preventing localized dryness and stiffness in fibers. Combined with the siloxane backbone, they form a composite lubricating layer, reducing the coefficient of friction of fibers and enhancing the silky, fluffy feel. The hydroxyl groups improve the compatibility of components, enhance wetting and penetration, accelerate dirt removal, improve anti-redeposition properties, increase overall moisture absorption, form a continuous conductive water layer, facilitate charge dissipation, improve antistatic properties, and synergistically enhance the compatibility of components with the ether bonds, enabling the components to form a continuous composite lubricating film and improving softness. Ether bonds can reduce the overall surface tension of the system, enhance the emulsification and dispersion of dirt, continuously adsorb water vapor to build conductive pathways, and synergistically superimpose hygroscopic sites with hydroxyl groups to further improve charge conduction efficiency and antistatic properties. They can also synergistically enhance the compatibility of each component with hydroxyl groups, thereby improving flexibility.

[0021] Furthermore, the modified organosilicon surfactant described in this invention can work synergistically with the modified alkylamide imidazoline quaternary ammonium salt to reduce the surface tension of the system, reduce the adhesion of dirt to the fibers, form a continuous conductive water film on the surface of the fibers to neutralize the charge, spread an ultra-thin silicone lubricating layer on the surface of the fibers, fill the gaps between cationic molecules, improve compatibility, help form a composite lubricating film, and improve the various performance characteristics of the product.

[0022] This invention abandons irritating anionic surfactants and uses a high content of nonionic surfactants in a weakly acidic pH formula. The active groups do not hydrolyze or denature with silk protein fibers, thus fundamentally solving problems such as brittleness, stiffness, loss of luster, shrinkage, and yellowing of silk and wool fabrics after washing. The concentration ratio far exceeds that of conventional silk and wool washing and care products. Combined with the synergistic effects of lauryl alcohol EO / PO block polyether in penetration, emulsification, and solubilization, it inhibits the gelation tendency of the high-concentration nonionic system while greatly improving detergency. It can quickly remove mixed stains such as sweat, grease, and dirt from fiber gaps, achieving thorough stain removal.

[0023] This invention constructs a ternary molecularly oriented "core-shell-membrane" microstructure for softness performance. The core is a modified alkylamide imidazoline quaternary ammonium salt, the middle layer is cocamidopropyl hydroxysulfonate betaine (CHSB), and the outer layer is a lauryl alcohol EO / PO block polyether flexible membrane. Relying on the three-dimensional synergistic mechanism of charge synergy, steric hindrance, and interfacial wetting, the middle layer cocamidopropyl hydroxysulfonate betaine inhibits the aggregation of core molecules, and the outer layer lauryl alcohol EO / PO block polyether provides steric shielding and low-temperature wetting properties. Ultimately, the modified alkylamide imidazoline quaternary ammonium salt adheres to the surface of silk and wool fibers to form a uniform flexible protective film, achieving excellent softness effect. Detailed Implementation

[0024] To more clearly illustrate the technical solution of the present invention, the following embodiments are provided. Unless otherwise stated, the raw materials, reactions, and post-processing methods appearing in the embodiments are all commercially available raw materials and technical methods well known to those skilled in the art.

[0025] The terms "preferred," "more preferably," and "more suitable" used in this invention refer to embodiments of the invention that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this invention.

[0026] It should be understood that, except in any operational instance or otherwise indicated, the amounts or all figures representing ingredients used, for example, in the specification and claims, should be understood to be modified by the term "about" in all cases. Therefore, unless otherwise stated, the numerical parameters set forth in the following specification and appended claims are approximate values ​​varying according to the desired performance to be obtained according to the invention.

[0027] The embodiments of the present invention use the following raw materials: Low-hydrogen silicone oil: with a hydrogen content of 0.2%, purchased from Jiangxi Bait Silicon Industry New Materials Co., Ltd.

[0028] Allyl polyethylene glycol: molecular weight 500, purchased from Nantong Chenrun Chemical Co., Ltd.

[0029] Glycerin: Solvent, purchased from Guangzhou Reagent Factory.

[0030] Propylene glycol: solvent, purchased from Guangzhou Reagent Factory.

[0031] Citric acid: Neutralizing agent, purchased from Guangzhou Reagent Factory.

[0032] FMEE: Fatty acid methyl ester ethoxylate, brand name FMEE-24-09, nonionic surfactant, purchased from China National Light Industry Chemical Co., Ltd.

[0033] Secondary alcohol polyoxyethylene ether: brand name secondary alcohol 1209, nonionic surfactant, purchased from Jiangsu SECCO.

[0034] CHSB: Cocamidopropyl hydroxysulfonate betaine, brand name CHSB-35, a zwitterionic surfactant, purchased from Zanyu Technology.

[0035] SOE-N-60 (brand name): Palm oil ethoxylate, nonionic surfactant, purchased from China National Light Industry Chemical Co., Ltd.

[0036] EP2454 (brand name): Lauryl alcohol EO / PO block polyether, nonionic surfactant, purchased from Clariant.

[0037] APG: Alkyl glycoside, brand name APG-1214, nonionic surfactant, purchased from Zanyu Technology.

[0038] Preservatives (additives): A mixture of methylisothiazolinone and chloromethylisothiazolinone in a mass ratio of 3:1, purchased from Qinxiang New Materials (Guangzhou) Co., Ltd.

[0039] Fragrance (additive), model IGC-0373, purchased from IFF.

[0040] Pigment (auxiliary agent), model number LTYELLOW FT, purchased from Milliken.

[0041] Deionized water, solvent.

[0042] The water-soluble membrane is a conventional commercial PVA membrane.

[0043] The components and mass fractions of the concentrated laundry detergent pods for silk and wool described in Examples 1-3 are shown in Table 1.

[0044] Table 1. Components and mass fractions of the concentrated laundry detergent pods for silk and wool described in Examples 1-3 Examples 1-3 A concentrated laundry detergent pod specifically for silk and wool, the preparation method of the concentrated laundry detergent pod for silk and wool includes the following steps: S1. Under a nitrogen atmosphere, low-hydrogen silicone oil and catalyst chloroplatinic acid hexahydrate were blended at a mass ratio of 50:0.02 and heated to 90°C for 0.5 h. Then, 1-octadecene (the mass ratio of low-hydrogen silicone oil to 1-octadecene was 50:6) was added, and the mixture was heated to 110°C and stirred for 0.5 h. Then, allyl polyethylene glycol and catalyst chloroplatinic acid hexahydrate (the mass ratio of low-hydrogen silicone oil to allyl polyethylene glycol to catalyst chloroplatinic acid hexahydrate was 50:12:0.02) were added, and the mixture was heated to 110°C and stirred for 3 h to obtain a modified organosilicon surfactant. S2. Under a nitrogen atmosphere, oleic acid, diethylenetriamine, and isopropanol are mixed in a molar ratio of 2:1:1.5, and the mixture is heated to the reflux temperature of the system to perform azeotropic water separation and separate the water generated by amidation. After the water separation is completed and the isopropanol is distilled off, the mixture is heated to 160°C and reacted for 3 hours to obtain the dialkylamide amine intermediate. S3. Under vacuum conditions of -0.09 MPa, the dialkylamide amine intermediate was reacted at 200°C for 2 hours to achieve deep dehydration and ring closure. The reaction endpoint was defined as acid value ≤5 mg KOH / g and the absence of water distillation. The temperature was then lowered to 80°C to obtain the alkylamide imidazoline tertiary amine intermediate. S4. The alkylamide imidazoline tertiary amine intermediate, dimethyl sulfate, and isopropanol are blended in a molar ratio of 1:1.05:0.5. The dimethyl sulfate is added dropwise over 1.5 hours. The mixture is heated to 80°C for 2 hours, cooled to 50°C, and the pH is adjusted to 6.5 with propionic acid to remove free amine impurities. The mixture is then filtered to obtain the modified alkylamide imidazoline quaternary ammonium salt. S5. According to the above mass fraction, the modified organosilicon surfactant is blended with the remaining components to obtain the contents; S6. The contents are packaged with a PVA water-soluble film with a thickness of 80μm to obtain the concentrated laundry detergent pods for silk and wool.

[0045] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the modified organosilicon surfactant was replaced with FMEE by mass, while the remaining components and preparation methods were the same as in Example 1.

[0046] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the modified alkylamide imidazoline quaternary ammonium salt was replaced with FMEE by mass, while the remaining components and preparation methods were the same as in Example 1.

[0047] Test Example 1 Stability tests were conducted on the laundry detergent pods prepared in Examples 1-3 and Comparative Examples 1-2.

[0048] Test method: Low temperature stability: Place the laundry detergent pods in an environment with a temperature of 0±2℃ and keep them at a constant temperature for 8 weeks. Then take them out and observe them immediately. If the laundry detergent pods do not show obvious discoloration, layering or precipitation, they are judged to be qualified for low temperature stability.

[0049] Temperature and humidity stability: Place the laundry detergent pods in an environment with a temperature of 37±2℃ and a humidity of 75% for 8 weeks. Then take them out and observe them immediately. If the laundry detergent pods do not show obvious discoloration, layering or precipitation, they are judged to be qualified for temperature and humidity stability.

[0050] Room temperature stability: Place the laundry detergent pods in an environment with a temperature of 25±2℃ and keep them at a constant temperature for 8 weeks. Take them out and observe them immediately. If the laundry detergent pods do not show obvious discoloration, layering or precipitation, they are judged to be qualified for room temperature stability.

[0051] High temperature stability: Place the laundry detergent pods in an environment of 45±2℃ and keep them at a constant temperature for 8 weeks. Then take them out and observe them immediately. If the laundry detergent pods do not show obvious discoloration, layering or precipitation, they are judged to be qualified for high temperature stability.

[0052] Freeze-thaw cycle stability: Place the laundry detergent pods at -15℃ for 24 hours, then remove them and place them at room temperature for 24 hours. Repeat this cycle 4 times. After each cycle, observe the appearance. If the laundry detergent pods do not show obvious discoloration, layering, or precipitation, they are considered to have passed the freeze-thaw cycle stability test.

[0053] Cold and hot cycle stability: Place the laundry detergent pods at -15℃ for 24 hours, then remove them and place them at 45±1℃ for 24 hours. Repeat this cycle 4 times. After each cycle, observe the appearance. If the laundry detergent pods do not show obvious discoloration, layering, or precipitation, they are considered to have passed the cold and hot cycle stability test.

[0054] Test results: The test results are shown in Table 2.

[0055] Table 2 Test Results As shown in Table 2, the stability of Examples 1-3 is superior to that of Comparative Example 1. This is because the modified organosilicon surfactant, modified alkylamide imidazoline quaternary ammonium salt, EP2454, and CHSB in these examples solve the low-temperature association turbidity problem of high-content secondary alcohols, FMEE, and SOE systems through a four-fold synergistic mechanism of steric hindrance, electrostatic repulsion, amphoteric dispersion, and micelle reconstruction. EP2454, relying on the branched structure of the PO block, expands the mixed micelles, significantly increasing the micelle solubility volume, fully encapsulating the hydrophobic components, and simultaneously disrupting the regular hydrogen bonds between nonionic molecules, thus fundamentally inhibiting low-temperature molecular association and aggregation. The modified alkylamide imidazoline quaternary ammonium salt can give the micelle surface a uniform positive charge, generating a strong electrostatic repulsion force, counteracting hydrophobic attraction and van der Waals forces, and preventing micelle aggregation and sedimentation. The amphoteric surfactant CHSB is flexibly embedded in the micelle system, further dispersing the tightly packed molecules, bridging the polarity differences of each component, and reducing interfacial tension. The modified organosilicon surfactant improves the compatibility of each component and prevents aggregation. Through synergistic effects, the four components effectively improve the cloud point and stability of the system, and have good solubilizing and anti-aggregating gelling effects, thus enabling the product to form a stable and uniform system under various temperature conditions.

[0056] In contrast, Comparative Example 1 replaced the modified organosilicon surfactant with FMEE, which weakened the synergistic effect of the components and led to a decrease in stability.

[0057] Test Example 2 The stain removal performance of the laundry detergent pods prepared in Example 1 and Comparative Examples 1-2 was tested.

[0058] Test method: Base fabric: 100% degummed white mulberry silk power-spun (silk), uniformly cut into 30mm×30mm square samples.

[0059] Standard stains: JB-01 Carbon black stain (GB / T 13174-2021), JB-02 Protein stain (GB / T 13174-2021), JB-03 Sebum stain (GB / T 13174-2021).

[0060] Preparation of soiled cloths: Apply equal amounts of the three types of stains to the center of each silk sample. The diameter of each stain should be uniformly 10 mm. Allow the samples to stand naturally at room temperature for 24 hours to allow the stains to completely penetrate and adhere to the silk fibers, thus preparing the soiled silk cloths to be tested. Each sample to be tested corresponds to 3 pieces each of carbon black soiled cloth, sebum soiled cloth, and protein soiled cloth.

[0061] Stain removal test method: The test was conducted according to the national standard GB / T 13174 "Determination of Stain Removal Power and Recycled Washing Performance of Detergents for Clothing". A vertical stain remover was used for washing, with a water hardness of 250 ppm, a washing time of 20 minutes, a washing temperature of 30℃, and two rinses. The products were then air-dried at room temperature. The concentration of the laundry detergent pods prepared in Examples 1 and Comparative Examples 1-2 was 0.2 wt%.

[0062] The results of the stain removal performance test are shown in Table 3.

[0063] The X value represents the stain removal rate; the higher the X value, the better the cleaning power.

[0064] X = (Whiteness value of soiled cloth after washing - Whiteness value of soiled cloth before washing) / (Whiteness value of blank white cloth - Whiteness value of soiled cloth before washing) × 100%.

[0065] Table 3 Performance Test Results As shown in Table 3, the detergency performance of Example 1 is superior to that of Comparative Examples 1-2. This is because the EP2454 block structure of Example 1 possesses excellent wetting and penetration properties, allowing it to spread rapidly on the substrate surface and break down dirt and interfacial adhesion. The modified alkylamide imidazoline quaternary ammonium salt neutralizes the negative charge on the dirt surface with its cationic charge, reducing dirt adhesion and playing a role in aiding cleaning. CHSB optimizes interfacial activity, further reducing surface tension and improving wettability. The combination of modified alkylamide imidazoline quaternary ammonium salt, EP2454, and CHSB creates a dual effect of electrostatic repulsion and steric hindrance, stably dispersing the stripped dirt in water. This significantly enhances the emulsification and micellar solubilization capabilities for grease and organic dirt, preventing dirt redeposition and enhancing the detergency effect.

[0066] Furthermore, the modified silicone surfactant of Example 1 can work synergistically with other components such as the modified alkylamide imidazoline quaternary ammonium salt to further reduce the surface tension of the system and enhance the penetration and removal of stains. In addition, the modified alkylamide imidazoline quaternary ammonium salt can reduce the adhesion of dirt to fibers by utilizing charge, thereby making the dirt easier to remove. The modified silicone surfactant can emulsify and encapsulate the dirt. The synergistic effect of the two enables the dirt to be removed simultaneously and efficiently.

[0067] In Comparative Example 1, replacing the modified silicone surfactant with FMEE by mass weakened the emulsification and encapsulation effect on dirt and eliminated the synergistic effect between the modified silicone surfactant and the modified alkylamide imidazoline quaternary ammonium salt, resulting in reduced detergency. In Comparative Example 2, replacing the modified alkylamide imidazoline quaternary ammonium salt with FMEE weakened the promotion effect on dirt removal and eliminated the synergistic effect between the modified silicone surfactant and the modified alkylamide imidazoline quaternary ammonium salt, resulting in reduced detergency.

[0068] Test Example 3 The antistatic properties of the laundry detergent pods prepared in Example 1 and Comparative Examples 1-2 were tested.

[0069] Test method: Laundry detergent pods from Example 1 and Comparative Examples 1-2 were selected, and their antistatic properties were tested in accordance with GB / T 16801-2013 "Determination of Antistatic Properties of Fabric Conditioners".

[0070] The test results are shown in Table 4.

[0071] Table 4 Test Results As shown in Table 4, Example 1 exhibits the best performance. This is because the modified alkylamide imidazoline quaternary ammonium salt, CHSB, and EP2454 form a "core-shell-film" structure on the fiber surface, synergistically enhancing antistatic capabilities. The core layer, composed of the modified alkylamide imidazoline quaternary ammonium salt, has cationic groups adsorbed onto the fiber surface, directly neutralizing negative charges and suppressing static electricity at its source. The middle layer, CHSB, an amphoteric surfactant, forms a continuous hydration film, enhancing surface hygroscopicity and further accelerating charge dissipation. The outer layer, composed of EP2454, has hydrophilic EO chains that bind to moisture to form conductive channels, dispersing residual charges while preventing localized charge accumulation due to steric hindrance. This layered structure achieves multiple functions of charge neutralization, conduction, and dissipation, effectively reducing the surface resistivity of silk and wool fibers and providing long-lasting improvement in antistatic performance.

[0072] In addition, the modified organosilicon surfactant of Example 1 can adsorb moisture in the air to form a continuous conductive water film on the silk and wool surface, thereby dissipating residual charge. It can also help the modified alkylamide imidazoline quaternary ammonium salt to spread evenly on the silk and wool surface by improving compatibility and reducing the surface tension of the system, which is beneficial for neutralizing charge and reducing static electricity generation from the source.

[0073] In Comparative Example 1, replacing the modified silicone surfactant with FMEE by mass was detrimental to the formation of a continuous conductive water film, improving compatibility, reducing the surface tension of the system, and eliminating the synergistic effect between the modified silicone surfactant and the modified alkylamide imidazoline quaternary ammonium salt, resulting in a decrease in antistatic performance. In Comparative Example 2, replacing the modified alkylamide imidazoline quaternary ammonium salt with FMEE by mass weakened the charge neutralization effect and eliminated the synergistic effect between the modified silicone surfactant and the modified alkylamide imidazoline quaternary ammonium salt, resulting in a decrease in antistatic performance.

[0074] Test Example 4 The softening properties of the laundry detergent pods prepared in Example 1 and Comparative Examples 1-2 were tested.

[0075] Test method: Add one (10g) laundry detergent pod to a front-loading washing machine and wash a 74cm×48cm silk pillowcase and a wool sweater (100% pure wool) using a standard washing program. After washing, air dry indoors. Have 10 evaluators rate the softening effect, scoring it on a scale of 1-5 and calculating the average score. The higher the average score, the better the softening effect of the product.

[0076] The results are shown in Table 5.

[0077] Table 5 Test Results As shown in Table 5, the smoothness of Example 1 is superior to that of Comparative Examples 1-2. This is due to the synergistic combination of modified alkylamide imidazoline quaternary ammonium salt, CHSB, and EP2454, forming a "core-shell-membrane" smoothness structure. The modified alkylamide imidazoline quaternary ammonium salt is the main component, firmly adsorbed onto the negatively charged fiber surface by electrostatic attraction, forming the structural core. Its long alkyl chains are evenly distributed, forming a hydrophobic substrate, significantly reducing inter-fiber friction, while neutralizing surface charge and eliminating electrostatic entanglement. CHSB is uniformly distributed in the middle layer, forming a continuous flexible film, weakening the dryness caused by cations and making the overall film layer smoother. EP2454 is embedded in the gaps between cation molecules to form the outermost layer. The flexible long chains of PO / EO fill the gaps and extend, further improving lubricity and preventing excessive aggregation of cation molecules, thus avoiding localized stiffening of the fibers. The "core-shell-membrane" layered structure is stable and uniformly attached, possessing the triple advantages of low friction, antistatic properties, and a soft touch, ultimately significantly improving the fabric's bulk and smoothness.

[0078] Furthermore, the modified organosilicon surfactant described in this invention can spread an ultra-thin silicone lubricating layer on the surface of silk and wool fibers, reducing friction and improving the silky and fluffy feel. The long alkyl chain can fill the gaps between cationic molecules, avoiding the problem of local dryness and hardening. The hydroxyl and ether bonds can form hydrogen bonds with the other components, improving compatibility. The modified alkyl amide imidazoline quaternary ammonium salt and other components are firmly combined into an integrated composite lubricating film, preventing the occurrence of local lack of lubricating film, making the fabric feel uniform and free of dry patches.

[0079] In Comparative Example 1, replacing the modified silicone surfactant with FMEE by mass resulted in the inability to form a silicone lubricating layer, which was detrimental to filling the gaps between cationic molecules and to forming a lubricating film. Furthermore, the synergistic effect between the modified silicone surfactant and the modified alkylamide imidazoline quaternary ammonium salt disappeared, leading to a decrease in compliance performance. In Comparative Example 2, replacing the modified alkylamide imidazoline quaternary ammonium salt with FMEE by mass also hindered the formation of a lubricating film and caused the synergistic effect between the modified silicone surfactant and the modified alkylamide imidazoline quaternary ammonium salt to disappear, resulting in a decrease in compliance performance.

[0080] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0081] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A concentrated laundry detergent pod specifically for silk and wool, characterized in that, The concentrated laundry detergent pods specifically for silk and wool comprise the following components by mass fraction: Modified organosilicon surfactant 1-5% Modified alkylamide imidazoline quaternary ammonium salt 1-6% Cocamidopropyl hydroxysulfonate 1-8% Lauryl alcohol EO / PO block polyether 2-15% Nonionic surfactants 40-60% Additives 0.1-5% Neutralizing agent 0.1-2% Solvent balance; in, The modified alkylamide imidazoline quaternary ammonium salt is obtained by first subjecting fatty acids and diethylenetriamine to high-temperature amidation and negative pressure cyclization, followed by quaternization with dimethyl sulfate. The modified organosilicon surfactant is obtained by blending low-hydrogen silicone oil, 1-octadecene, and allyl polyethylene glycol.

2. The concentrated laundry detergent pods for silk and wool according to claim 1, characterized in that, The nonionic surfactant is selected from one or more of the following: fatty alcohol polyoxyethylene ether, fatty alcohol alkoxylate, fatty acid ethoxylate, fatty acid alkylolamide, alkyl polysaccharide, fatty acid methyl ester ethoxylate, and oil ethoxylate.

3. The concentrated laundry detergent pods for silk and wool according to claim 1, characterized in that, The additives are selected from one or more of the following: fragrances, preservatives, anti-redeposition agents, chelating agents, pigments, and inorganic salts.

4. The concentrated laundry detergent pods for silk and wool according to claim 1, characterized in that, The solvent is selected from one or more of deionized water, ethanol, glycerol, propylene glycol, sorbitol, polyethylene glycol, diethylene glycol butyl ether, dipropylene glycol methyl ether, tripropylene glycol methyl ether, diethylene glycol butyl ether acetate, dipropylene glycol butyl ether, and tripropylene glycol butyl ether.

5. The method for preparing concentrated laundry detergent pods for silk and wool according to any one of claims 1-4, characterized in that, The method for preparing the concentrated laundry detergent pods specifically for silk and wool includes the following steps: S1. Low-hydrogen silicone oil, 1-octadecene, allyl polyethylene glycol, and catalyst are blended and heated and stirred to obtain a modified organosilicon surfactant. S2. Under an inert atmosphere, fatty acids and diethylenetriamine are blended and heated to react, yielding a dialkylamide amine intermediate. S3. Under vacuum conditions, the dialkylamide amine intermediate is heated to obtain an alkylamide imidazoline tertiary amine intermediate; S4. The alkylamide imidazoline tertiary amine intermediate and dimethyl sulfate are mixed and heated to obtain the modified alkylamide imidazoline quaternary ammonium salt. S5. The modified organosilicon surfactant is blended with the remaining components to obtain the contents; S6. Package the contents to obtain the concentrated laundry detergent pods specifically for silk and wool.

6. The method for preparing concentrated laundry detergent pods specifically for silk and wool according to claim 5, characterized in that, In step S1, the mass ratio of the low-hydrogen silicone oil, 1-octadecene, and allyl polyethylene glycol is (40-60):(3-8):(1-15).

7. The method for preparing concentrated laundry detergent pods specifically for silk and wool according to claim 5, characterized in that, In step S1, the reaction time is 2-5 hours.

8. The method for preparing concentrated laundry detergent pods specifically for silk and wool according to claim 5, characterized in that, In step S1, the heating temperature is 80-120℃.

9. The method for preparing concentrated laundry detergent pods specifically for silk and wool according to claim 5, characterized in that, In step S2, the reaction time is 2-4 hours.

10. The method for preparing concentrated laundry detergent pods specifically for silk and wool according to claim 5, characterized in that, In step S4, the reaction time is 2-4 hours.

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