Environment-friendly and efficient foaming cleaning agent and preparation method thereof

Abstract

The present application relates to the technical field of chemical cleaning agents, and particularly relates to an environment-friendly and efficient foaming cleaning agent and a preparation method thereof.The environment-friendly and efficient foaming cleaning agent comprises the following components: a composite surfactant, a double-layer microcapsule biological enzyme synergist, a multifunctional bacteriostatic additive, ethanol, sodium citrate, sodium bicarbonate, hydroxyethyl cellulose, a silicone foam stabilizer, benzalkonium chloride, D-limonene, modified polyether siloxane and a propellant.The environment-friendly and efficient foaming cleaning agent has the advantages of efficient decontamination, low damage to cleaning, low toxicity and the like, and is particularly suitable for use in low-volatility and multifunctional scenarios in a vehicle cabin.

Description

Technical Field

[0001] This invention relates to the field of chemical cleaning agent technology, and in particular to an environmentally friendly and efficient foam cleaning agent and its preparation method. Background Technology

[0002] Foam cleaners are cleaning products that are sprayed from pressurized containers or aerosol cans to form foam. Through the synergistic effect of foaming agents and surfactants, the cleaning components adhere to the surface to be cleaned in foam form, extending contact time and enhancing the cleaning effect. In the field of automotive interior cleaning, foam cleaners are mainly used to remove stains from fabric seats, headliners, carpets, plastics, and leather, and are characterized by strong penetration, high cleaning efficiency, rapid evaporation, and minimal residue.

[0003] Although foam cleaners are widely used in the automotive cleaning industry, existing products still have the following shortcomings: ① The contradiction between cleaning power and materials: Strong cleaning ingredients are mostly organic solvents, which may damage leather or plastic surfaces, leading to fading or aging, while mild formulas have limited stain removal capabilities and are difficult to remove stubborn stains such as oil and ink; ② Residue and secondary pollution: Some products leave sticky residues after evaporation, which adsorb dust and form secondary pollution, or produce a pungent odor; ③ Environmental and health hazards: Containing volatile organic compounds (VOCs) or irritating surfactants, such as sodium dodecylbenzene sulfonate, long-term use may harm the health of drivers and passengers and does not comply with environmental regulations.

[0004] In response to the aforementioned technologies, there is an urgent need in the field to develop a foam cleaning agent that ensures efficient stain removal while achieving low damage, low toxicity, and multi-functionality in the cleaning process. Summary of the Invention

[0005] To meet the requirements of foam cleaning agents having high efficiency in removing dirt, avoiding cleaning damage, and low toxicity, this application provides an environmentally friendly and efficient foam cleaning agent and its preparation method, which is suitable for scenarios requiring low volatility and multi-functionality in automotive cabins.

[0006] Firstly, this application provides an environmentally friendly and highly efficient foam cleaning agent, employing the following technical solution:

[0007] An environmentally friendly and efficient foam cleaning agent is prepared from the following raw materials in parts by weight: 55-65 parts deionized water, 7-10 parts composite surfactant, 0.5-2 parts double-layer microcapsule bio-enzyme synergist, 0.5-2 parts multifunctional antibacterial additive, 1-3 parts ethanol, 0.2-1 parts sodium citrate, 0.1-0.8 parts sodium bicarbonate, 0.1-0.5 parts hydroxyethyl cellulose, 0.1-0.3 parts silicone foam stabilizer, 0.3-1 parts benzalkonium chloride, 2-5 parts D-limonene, 0.5-1.5 parts modified polyether siloxane, and 18-25 parts propellant.

[0008] By adopting the above-mentioned solution, the combination of composite surfactant, multifunctional antibacterial additive, benzalkonium chloride, and D-limonene provides a broad-spectrum antibacterial effect while reducing chemical residues through the natural ingredient D-limonene, aligning with environmental protection trends. The combination of hydroxyethyl cellulose as a thickener, silicone foam stabilizer, modified polyether siloxane, and propellant enhances foam durability and utilizes polyether segments for rapid defoaming under dynamic conditions, avoiding secondary pollution. The double-layer microencapsulation technology protects the activity of biological enzymes, prolongs their stability in cleaning agents, and achieves a sustained-release effect. The modified polyether siloxane forms a nanoscale hydrophobic layer after cleaning, providing both dustproof and antistatic functions, reducing the need for secondary maintenance by users. This solution outperforms mainstream products in key indicators such as cleaning ability, material safety, and environmental friendliness, making it particularly suitable for low-volatile environments in automotive cabins.

[0009] An environmentally friendly and efficient foam cleaning agent is prepared from the following raw materials in parts by weight: 58-62 parts deionized water, 8-9 parts composite surfactant, 1-1.5 parts double-layer microcapsule bio-enzyme synergist, 1-1.5 parts multifunctional antibacterial additive, 1.5-2.5 parts ethanol, 0.4-0.8 parts sodium citrate, 0.3-0.6 parts sodium bicarbonate, 0.2-0.4 parts hydroxyethyl cellulose, 0.15-0.25 parts silicone foam stabilizer, 0.5-0.8 parts benzalkonium chloride, 3-4 parts D-limonene, 0.8-1.2 parts modified polyether siloxane, and 20-23 parts propellant.

[0010] Preferably, the composite surfactant is prepared from the following raw materials in parts by weight: 3-5 parts cocamidopropyl betaine, 2-4 parts non-alkyl glucoside, and 1-3 parts sodium α-olefin sulfonate.

[0011] By adopting the above scheme, the composite surfactant rapidly emulsifies grease and non-alkyl glucoside dirt with sodium α-olefin sulfonate, and reduces the surface tension of the material with zwitterionic cocamidopropyl betaine. The combination of the three types of surfactants achieves dynamic synergy in stain dissolution, peeling, and post-cleaning protection. Compared with traditional single surfactants, the cleaning efficiency of mixed grease and particulate stains is greatly improved.

[0012] Preferably, the bilayer microcapsule bio-enzyme synergist is prepared by first coating the enzyme solution with sodium alginate microspheres as the inner layer, and then coating the outer layer with chitosan by electrostatic adsorption. The microcapsules are collected by centrifugation, washed three times with deionized water, and freeze-dried at -40 to -50°C for 18-24 hours.

[0013] By adopting the above scheme, the biological enzyme is encapsulated in sodium alginate-chitosan bilayer microcapsules, which solves the problem of enzyme inactivation in liquid formulations. After 6 months of storage at room temperature, the enzyme activity retention rate is significantly improved. Compared with the traditional method of directly adding free enzymes, this solves the problem of enzyme inactivation in strong surfactant environments.

[0014] Preferably, the inner layer sodium alginate microspheres adopt the following technical solution: sodium alginate is mixed with an enzyme solution of 5-15% concentration, and magnetically stirred at 30-50℃ for 1-2 hours to form a uniform mixture. Droplet control is achieved through a microfluidic device, and the mixture is dropped into a 2% CaCl2 solution using a coaxial needle with an inner diameter of 0.4 mm. The droplet diameter is controlled at 200-300 μm. The mixture is then allowed to stand in the 2% CaCl2 solution for 30 minutes to crosslink and solidify, thus completing the inner layer encapsulation.

[0015] Preferably, the outer chitosan coating adopts the following technical solution: sodium alginate microspheres are transferred to a 2% chitosan acetic acid solution and stirred at low speed of 150-200 rpm for 20-30 min, where chitosan forms an outer membrane through electrostatic adsorption; then a 0.5% TPP solution is added and stirred at low speed of 150-200 rpm for 15-20 min, where the anionic TPP crosslinks with the cationic chitosan, thereby enhancing the mechanical strength of the membrane.

[0016] Preferably, in the inner layer of sodium alginate microspheres, the sodium alginate and enzyme solution are in a mass ratio of 3:(6-8).

[0017] Preferably, the enzyme solution comprises three or more of the following: lipase, protease, cellulase, amylase, hemicellulase, catalase, and lysozyme.

[0018] Preferably, the enzyme solution is composed of lipase, protease and lysozyme in a mass ratio of 1:(1-2):(1-2).

[0019] Preferably, the 2% chitosan solution is prepared by dissolving 2 parts of chitosan in 98 parts of 1% acetic acid solution and adjusting the pH to 5.0-5.5 to avoid excessive swelling of the sodium alginate layer.

[0020] Preferably, the multifunctional antibacterial additive, the compound essential oil microcapsules and the silver ion-loaded zeolite are in a mass ratio of 1:(1-2).

[0021] The multifunctional antibacterial additive uses microcapsules to release compound essential oils for long-lasting antibacterial effects, combined with silver ion zeolite to inhibit mold growth, thus replacing traditional chemical preservatives.

[0022] Preferably, the compound essential oil microcapsules are made using the following technical solution: a saturated β-cyclodextrin solution is mixed with the compound essential oil, magnetically stirred at 500-800 rpm for 4-6 hours at 60-70°C, refrigerated at 4°C for 12 hours to crystallize, and then freeze-dried after filtration.

[0023] Preferably, the saturated β-cyclodextrin solution and the compound essential oil in the compound essential oil microcapsules are in a mass ratio of 8:(1-2).

[0024] Preferably, the compound essential oil is tea tree oil, rosemary oil, lemongrass oil and bergamot oil in a mass ratio of (4-6):(2-3):(2-3):0.5.

[0025] Preferably, the tea tree oil has a purity of ≥98%; the rosemary oil has eucalyptol ≥55% and cinnamaldehyde ≥85%; the lemongrass oil has citral ≥75%; and the bergamot oil has an ester content of ≥36%.

[0026] Preferably, the freeze-drying process includes: pre-freezing stage: -40℃ to -80℃, ≥4h; primary drying stage: cold trap temperature ≤-50℃, vacuum degree 0.1-0.01mbar, initial temperature: -40℃, slowly increasing to -20℃, maintaining for 24-36h; secondary drying stage: gradually increasing to 25-30℃, maintaining a vacuum degree of 0.01-0.001mbar, 8-12h.

[0027] Preferably, the propellant, propane and n-butane, are in a mass ratio of (3-4):7.

[0028] Secondly, this application provides a method for preparing an environmentally friendly and efficient foam cleaning agent, using the following technical solution: S1 Deionized water is added to a reaction vessel, heated to 40±2℃, sodium citrate and sodium bicarbonate are added sequentially, and stirred at 180-220 rpm until completely dissolved. Hydroxyethyl cellulose is slowly added, and stirred at 400-500 rpm for 20-30 min to avoid clumping, thereby obtaining a premixed aqueous phase.

[0029] S2 adds a composite surfactant to the premixed aqueous phase prepared by S1, and uses a high-shear emulsifier at 7000-9000 rpm for 5-10 min to form a homogeneous colloid. Then, ethanol and D-limonene are added, and emulsification is continued at 7000-9000 rpm for 5-10 min to obtain dispersion A.

[0030] S3 dissolves the multifunctional antibacterial additive and benzalkonium chloride in modified polyether siloxane, mixes it with dispersion A prepared in S2, and magnetically stirs at 300-500 rpm for 15-25 min to complete emulsification. The mixture is then cooled to 25℃, and a double-layer microcapsule bio-enzyme synergist is added. The mixture is stirred at low speed (80-150 rpm) for 10-20 min to prevent microcapsule rupture. A silicone foam stabilizer is then added, and the mixture is stirred for 5-10 min to obtain dispersion B.

[0031] S4 uses citric acid or sodium bicarbonate to finely adjust the pH of dispersion B to 6.5-7.5, then passes it through a homogenizer at 20-30 MPa for 3 cycles to refine the particle size to ≤50 μm, thus obtaining the slurry.

[0032] S5 filters the liquid material prepared in S4 and inputs it into the aerosol can, fills it with propellant, seals it, and then checks for leaks in a 50°C water bath for 30 minutes before labeling and packaging.

[0033] By adopting the above-mentioned solution, through bio-enzyme slow-release technology, environmentally friendly antibacterial system and dynamic foam stabilization design, the requirements for large-scale production of foam cleaning agents with high efficiency and low environmental risk can be met.

[0034] In summary, this application has the following beneficial effects:

[0035] 1. The environmentally friendly and efficient foam cleaning agent prepared by this application has the functions of high-efficiency stain removal, avoiding cleaning damage, low toxicity, and is especially suitable for low volatility requirements in car cabins and multi-functional effects.

[0036] 2. The environmentally friendly and efficient foam cleaning agent of this application provides a broad-spectrum antibacterial effect through the compounding of composite surfactants, multifunctional antibacterial additives, benzalkonium chloride and D-limonene, and reduces chemical residues through the natural ingredient D-limonene, which is in line with the trend of environmental protection. The combination of hydroxyethyl cellulose, silicone foam stabilizer, modified polyether siloxane and propellant not only improves foam durability, but also utilizes polyether segments to quickly defoam under dynamic conditions, avoiding secondary pollution.

[0037] 3. The environmentally friendly and efficient foam cleaning agent of this application can protect the activity of biological enzymes through double-layer microcapsule encapsulation technology, prolong their stability in the cleaning agent, and achieve a slow-release effect; the modified polyether siloxane forms a nano-scale hydrophobic layer after cleaning, which has both dustproof and antistatic functions, reducing the need for secondary maintenance operations by users.

[0038] 4. The preparation method of the environmentally friendly and efficient foam cleaning agent of this application, through bio-enzyme slow-release technology, environmentally friendly antibacterial system and dynamic foam stabilization design, can achieve the requirements of large-scale production of foam cleaning agents with high efficiency and low environmental risk. Detailed Implementation

[0039] The technical solution of this application is further illustrated by specific embodiments below. These specific embodiments do not represent a limitation on the scope of protection of this application. Any non-essential modifications and adjustments made by others based on the concept of this application still fall within the scope of protection of this application.

[0040] Unless otherwise specified, the experimental methods shown in the following examples are conventional methods. All reagents and materials shown are commercially available products.

[0041] Silver ion supported zeolite: Ao Ke New Materials Technology Co., Ltd., particle size 5-10μm.

[0042] Silicone foam stabilizer: Zhejiang Xin'an Chemical Group Co., Ltd., H-360.

[0043] Modified polyether siloxane: Zhejiang Xin'an Chemical Group Co., Ltd., H-3901.

[0044] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0045] The 1% acetic acid solution is acetic acid diluted with deionized water.

[0046] The 0.5% TPP solution: 5 g / L of TPP powder is dissolved in deionized water.

[0047] Preparation of the saturated β-cyclodextrin solution: Add ≥1.85g of β-cyclodextrin to distilled water at 60℃ until completely dissolved, then cool to room temperature. After cooling, filter out the precipitated crystals to ensure the solution is saturated.

[0048] Preparation Example

[0049] Preparation Examples 1-3: Preparation of Bilayer Microcapsule Bioenzyme Synergists

[0050] The bilayer microcapsule bio-enzyme synergist was prepared by first coating the enzyme solution with sodium alginate microspheres as the inner layer, and then coating the outer layer with chitosan by electrostatic adsorption. The microcapsules were collected by centrifugation, washed three times with deionized water, and freeze-dried.

[0051] The inner layer sodium alginate microspheres are constructed using the following technical solution: sodium alginate is mixed with an enzyme solution and magnetically stirred to form a homogeneous mixture. Droplet control is achieved using a microfluidic device. A coaxial needle with an inner diameter of 0.4 mm is used to drop the mixture into a 2% CaCl2 solution, with the droplet diameter controlled at 200-300 μm. The mixture is then allowed to stand in the 2% CaCl2 solution for 30 minutes to crosslink and solidify, thus completing the inner layer encapsulation.

[0052] Preferably, the outer chitosan coating adopts the following technical solution: sodium alginate microspheres are transferred to a 2% chitosan acetic acid solution and stirred at low speed, and chitosan forms an outer membrane through electrostatic adsorption; then a 0.5% TPP solution is added and stirred at low speed, and the membrane mechanical strength is enhanced by cross-linking of anionic TPP with cationic chitosan.

[0053] 2% chitosan solution: Dissolve 2g of chitosan in 98mL of 1% acetic acid solution, adjust the pH to 5.0-5.5, and avoid excessive swelling of the sodium alginate layer.

[0054] Bilayer microcapsule bio-enzyme synergists were obtained by compounding in different proportions, and the mass of each component is shown in Table 1.

[0055] Table 1. Proportions and dosages of each component in the preparation examples 1-3: Bilayer microcapsule bioenzyme synergists

[0056]

[0057] Preparation Examples 4-6: Preparation of Multifunctional Antibacterial Additives

[0058] The multifunctional antibacterial additive is a mixture of compound essential oil microcapsules and silver ion-loaded zeolite in a certain proportion.

[0059] The compound essential oil microcapsules are made using the following technical solution: a saturated β-cyclodextrin solution is mixed with the compound essential oil, magnetically stirred, refrigerated at 4°C for 12 hours to crystallize, filtered, and then freeze-dried.

[0060] The blend of essential oils consists of tea tree oil, rosemary oil, lemongrass oil, and bergamot oil in a specific ratio.

[0061] The quality of each component and process parameters are shown in Tables 2 and 3.

[0062] Table 2. Proportions of components in preparation examples 4-6: Multifunctional antibacterial additives

[0063]

[0064] Table 3. Dosage (g) of each component and process parameters of the multifunctional antibacterial additives prepared in Examples 4-6.

[0065]

[0066] Preparation Example 7: Preparation of Composite Surfactants

[0067] The composite surfactant is obtained by mixing 40g of cocamidopropyl betaine, 30g of nonalkyl glucoside, and 20g of sodium α-olefin sulfonate.

[0068] Preparation Example 8: Preparation of Composite Surfactants

[0069] The composite surfactant is obtained by mixing 30g of cocamidopropyl betaine, 20g of nonalkyl glucoside, and 10g of sodium α-olefin sulfonate.

[0070] Preparation Example 9: Preparation of Composite Surfactants

[0071] The composite surfactant is obtained by mixing 50g of cocamidopropyl betaine, 40g of nonalkyl glucoside, and 30g of sodium α-olefin sulfonate.

[0072] Preparation Example 10: Preparation of Propellant

[0073] The propellant consists of 60g of propane and 140g of n-butane.

[0074] Preparation Example 11: Preparation of Propellant

[0075] The propellant consists of 80g of propane and 140g of n-butane.

[0076] Example

[0077] Example 1

[0078] A method for preparing an environmentally friendly and efficient foam cleaning agent is as follows:

[0079] S1. Deionized water is added to the reactor and heated to 40±2℃. Sodium citrate and sodium bicarbonate are added in sequence and stirred at 200 rpm until completely dissolved. Hydroxyethyl cellulose is slowly added and stirred at 400 rpm for 20 min to avoid clumping, thus obtaining a premixed aqueous phase.

[0080] S2 adds a composite surfactant to the premixed aqueous phase prepared by S1, and uses a high-shear emulsifier at 8000 rpm for 10 min to form a homogeneous colloid. Ethanol and D-limonene are then added, and emulsification is continued at 8000 rpm for 10 min to obtain dispersion A.

[0081] S3 dissolves the multifunctional antibacterial additive and benzalkonium chloride in modified polyether siloxane, mixes it with dispersion A prepared in S2, and magnetically stirs at 400 rpm for 20 min to complete emulsification. The mixture is then cooled to 25℃, and a double-layer microcapsule bio-enzyme synergist is added. The mixture is stirred at 100 rpm for 10 min to prevent microcapsule rupture. A silicone foam stabilizer is added, and the mixture is stirred for 5 min to obtain dispersion B. S4 finely adjusts the pH of dispersion B to 6.5-7.5 using citric acid or sodium bicarbonate. The mixture is then homogenized at 30 MPa for 3 cycles to refine the particle size to ≤50 μm, obtaining the final solution.

[0082] S5 filters the liquid material prepared in S4 and inputs it into the aerosol can, fills it with propellant, seals it, and then checks for leaks in a 50°C water bath for 30 minutes before labeling and packaging.

[0083] The environmentally friendly and efficient foam cleaning agent is prepared from the following raw materials: 80g of composite surfactant, 12g of double-layer microcapsule bio-enzyme synergist, 21g of ethanol, 7g of sodium citrate, 3.5g of sodium bicarbonate, 13g of multifunctional antibacterial additive, 3g of hydroxyethyl cellulose, 2g of silicone foam stabilizer, 6g of benzalkonium chloride, 34g of limonene, 10g of modified polyether siloxane, 220g of propellant, and 610g of deionized water.

[0084] Among them, the composite surfactant was prepared by the method of Preparation Example 7; the bilayer microcapsule bioenzyme synergist was prepared by the method of Preparation Example 1; the multifunctional antibacterial additive was prepared by the method of Preparation Example 4; and the propellant was prepared by the method of Preparation Example 10.

[0085] Example 2

[0086] A method for preparing an environmentally friendly and efficient foam cleaning agent is as follows:

[0087] S1. Deionized water is added to the reactor and heated to 40±2℃. Sodium citrate and sodium bicarbonate are added in sequence and stirred at 180 rpm until completely dissolved. Hydroxyethyl cellulose is slowly added and stirred at 400 rpm for 20 min to avoid clumping, thus obtaining a premixed aqueous phase.

[0088] S2 adds a composite surfactant to the premixed aqueous phase prepared by S1, and uses a high-shear emulsifier at 7000 rpm for 5 min to form a homogeneous colloid. Ethanol and D-limonene are then added, and emulsification is continued at 7000 rpm for 5 min to obtain dispersion A.

[0089] S3 dissolves the multifunctional antibacterial additive and benzalkonium chloride in modified polyether siloxane, mixes it with dispersion A prepared in S2, and magnetically stirs at 300 rpm for 15 min to complete emulsification. The mixture is then cooled to 25°C, and a double-layer microcapsule bio-enzyme synergist is added. The mixture is stirred at low speed of 80 rpm for 10 min to prevent microcapsule rupture. A silicone foam stabilizer is then added, and the mixture is stirred for 5 min to obtain dispersion B.

[0090] S4 uses citric acid or sodium bicarbonate to finely adjust the pH of dispersion B to 6.5-7.5, then passes it through a homogenizer at 20MPa for 3 cycles to refine the particle size to ≤50μm, thus obtaining the feed solution;

[0091] S5 filters the liquid material prepared in S4 and inputs it into the aerosol can, fills it with propellant, seals it, and then checks for leaks in a 50°C water bath for 30 minutes before labeling and packaging.

[0092] The environmentally friendly and efficient foam cleaning agent is prepared from the following raw materials: 70g of composite surfactant, 5g of double-layer microcapsule bio-enzyme synergist, 10g of ethanol, 2g of sodium citrate, 1g of sodium bicarbonate, 5g of multifunctional antibacterial additive, 1g of hydroxyethyl cellulose, 1g of silicone foam stabilizer, 3g of benzalkonium chloride, 20g of limonene, 5g of modified polyether siloxane, 180g of propellant, and 550g of deionized water.

[0093] Among them, the composite surfactant was prepared by the method of Preparation Example 8; the bilayer microcapsule bioenzyme synergist was prepared by the method of Preparation Example 2; the multifunctional antibacterial additive was prepared by the method of Preparation Example 5; and the propellant was prepared by the method of Preparation Example 11.

[0094] Example 3

[0095] A method for preparing an environmentally friendly and efficient foam cleaning agent is as follows:

[0096] S1. Deionized water is added to the reactor and heated to 40±2℃. Sodium citrate and sodium bicarbonate are added in sequence and stirred at 220 rpm until completely dissolved. Hydroxyethyl cellulose is slowly added and stirred at 500 rpm for 30 min to avoid clumping, thus obtaining a premixed aqueous phase.

[0097] S2 adds a composite surfactant to the premixed aqueous phase prepared by S1, and uses a high-shear emulsifier at 9000 rpm for 5 min to form a homogeneous colloid. Ethanol and D-limonene are added, and emulsification is continued at 9000 rpm for 10 min to obtain dispersion A.

[0098] S3 dissolves the multifunctional antibacterial additive and benzalkonium chloride in modified polyether siloxane, mixes it with dispersion A prepared in S2, and magnetically stirs at 500 rpm for 25 min to complete emulsification. The mixture is then cooled to 25℃, and a double-layer microcapsule bio-enzyme synergist is added. The mixture is stirred at low speed (150 rpm) for 20 min to prevent microcapsule rupture. A silicone foam stabilizer is added, and the mixture is stirred for 10 min to obtain dispersion B. S4 finely adjusts the pH of dispersion B to 6.5-7.5 using citric acid or sodium bicarbonate. The mixture is then homogenized at 30 MPa for 3 cycles to refine the particle size to ≤50 μm, obtaining the final solution.

[0099] S5 filters the liquid material prepared in S4 and inputs it into the aerosol can, fills it with propellant, seals it, and then checks for leaks in a 50°C water bath for 30 minutes before labeling and packaging.

[0100] The environmentally friendly and efficient foam cleaning agent is prepared from the following raw materials: 80g of composite surfactant, 10g of double-layer microcapsule bio-enzyme synergist, 15g of ethanol, 4g of sodium citrate, 3g of sodium bicarbonate, 10g of multifunctional antibacterial additive, 2g of hydroxyethyl cellulose, 1.5g of silicone foam stabilizer, 5g of benzalkonium chloride, 30g of limonene, 8g of modified polyether siloxane, 200g of propellant, and 580g of deionized water.

[0101] Among them, the composite surfactant was prepared by the method of Preparation Example 9; the bilayer microcapsule bioenzyme synergist was prepared by the method of Preparation Example 3; the multifunctional antibacterial additive was prepared by the method of Preparation Example 6; and the propellant was prepared by the method of Preparation Example 10.

[0102] Example 4

[0103] A method for preparing an environmentally friendly and efficient foam cleaning agent is as follows:

[0104] S1. Add deionized water to the reactor, heat to 40±2℃, add sodium citrate and sodium bicarbonate in sequence, stir at 210 rpm until completely dissolved, slowly add hydroxyethyl cellulose, stir at 450 rpm for 25 min to avoid clumping, and obtain a premixed aqueous phase.

[0105] S2 adds a composite surfactant to the premixed aqueous phase prepared by S1, and uses a high-shear emulsifier at 8000 rpm for 5 min to form a homogeneous colloid. Ethanol and D-limonene are added, and emulsification is continued at 7000 rpm for 10 min to obtain dispersion A.

[0106] S3 dissolves the multifunctional antibacterial additive and benzalkonium chloride in modified polyether siloxane, mixes it with dispersion A prepared in S2, and magnetically stirs at 400 rpm for 15 min to complete emulsification. The mixture is then cooled to 25°C, and a double-layer microcapsule bio-enzyme synergist is added. The mixture is stirred at a low speed of 120 rpm for 10 min to prevent microcapsule rupture. A silicone foam stabilizer is then added, and the mixture is stirred for 5 min to obtain dispersion B.

[0107] S4 uses citric acid or sodium bicarbonate to finely adjust the pH of dispersion B to 6.5-7.5, then passes it through a homogenizer at 20MPa for 3 cycles to refine the particle size to ≤50μm, thus obtaining the feed solution;

[0108] S5 filters the liquid material prepared in S4 and inputs it into the aerosol can, fills it with propellant, seals it, and then checks for leaks in a 50°C water bath for 30 minutes before labeling and packaging.

[0109] The environmentally friendly and efficient foam cleaning agent is prepared from the following raw materials: 90g of composite surfactant, 15g of double-layer microcapsule bio-enzyme synergist, 25g of ethanol, 8g of sodium citrate, 6g of sodium bicarbonate, 15g of multifunctional antibacterial additive, 4g of hydroxyethyl cellulose, 2.5g of silicone foam stabilizer, 8g of benzalkonium chloride, 40g of limonene, 12g of modified polyether siloxane, 230g of propellant, and 620g of deionized water.

[0110] Among them, the composite surfactant was prepared by the method of Preparation Example 7; the bilayer microcapsule bioenzyme synergist was prepared by the method of Preparation Example 2; the multifunctional antibacterial additive was prepared by the method of Preparation Example 6; and the propellant was prepared by the method of Preparation Example 11.

[0111] Example 5

[0112] A method for preparing an environmentally friendly and efficient foam cleaning agent is as follows:

[0113] S1. Deionized water is added to the reactor and heated to 40±2℃. Sodium citrate and sodium bicarbonate are added in sequence and stirred at 190 rpm until completely dissolved. Hydroxyethyl cellulose is slowly added and stirred at 500 rpm for 20 min to avoid clumping, thus obtaining a premixed aqueous phase.

[0114] S2 adds a composite surfactant to the premixed aqueous phase prepared by S1, and uses a high-shear emulsifier at 7000 rpm for 10 min to form a homogeneous colloid. Ethanol and D-limonene are added, and emulsification is continued at 9000 rpm for 5 min to obtain dispersion A.

[0115] S3 dissolves the multifunctional antibacterial additive and benzalkonium chloride in modified polyether siloxane, mixes it with dispersion A prepared in S2, and magnetically stirs at 300 rpm for 25 min to complete emulsification. The mixture is then cooled to 25℃, and a double-layer microcapsule bio-enzyme synergist is added. The mixture is stirred at 100 rpm for 10 min to prevent microcapsule rupture. A silicone foam stabilizer is added, and the mixture is stirred for 5 min to obtain dispersion B. S4 finely adjusts the pH of dispersion B to 6.5-7.5 using citric acid or sodium bicarbonate. The mixture is then homogenized at 20 MPa for 3 cycles to refine the particle size to ≤50 μm, obtaining the final solution.

[0116] S5 filters the liquid material prepared in S4 and inputs it into the aerosol can, fills it with propellant, seals it, and then checks for leaks in a 50°C water bath for 30 minutes before labeling and packaging.

[0117] The environmentally friendly and efficient foam cleaning agent is prepared from the following raw materials: 100g of composite surfactant, 20g of double-layer microcapsule bio-enzyme synergist, 30g of ethanol, 10g of sodium citrate, 8g of sodium bicarbonate, 20g of multifunctional antibacterial additive, 5g of hydroxyethyl cellulose, 3g of silicone foam stabilizer, 10g of benzalkonium chloride, 50g of limonene, 15g of modified polyether siloxane, 250g of propellant, and 650g of deionized water.

[0118] Among them, the composite surfactant was prepared by the method of Preparation Example 8; the bilayer microcapsule bioenzyme synergist was prepared by the method of Preparation Example 1; the multifunctional antibacterial additive was prepared by the method of Preparation Example 5; and the propellant was prepared by the method of Preparation Example 10.

[0119] Example 6

[0120] Similar to Example 1, except that the enzyme solution for enhancing the bioenzyme of the bilayer microcapsule is a mixture of lipase, protease and cellulase in a mass ratio of 1:1:1.

[0121] Example 7

[0122] Similar to Example 1, except that the enzyme solution for enhancing the bioenzyme of the bilayer microcapsule is a mixture of amylase, protease and catalase in a mass ratio of 1:1:1.

[0123] Example 8

[0124] Similar to Example 1, except that the enzyme solution for enhancing the bioenzyme of the double-layer microcapsule is a mixture of lysozyme, lipase and catalase in a mass ratio of 1:1:1.

[0125] Comparative Example

[0126] Comparative Example 1

[0127] Similar to Example 1, except that the composite surfactant is 30g of sodium dodecylbenzenesulfonate and 20g of fatty alcohol polyoxyethylene ether.

[0128] Comparative Example 2

[0129] Same as in Example 1, except that the composite surfactant is replaced with 70g of sodium dodecyl sulfate.

[0130] Comparative Example 3

[0131] Similar to Example 1, except that the enzyme solution for enhancing the bioenzyme in the double-layer microcapsule is replaced with one that is not encapsulated in double-layer microcapsules, and the enzyme solution is a mixture of lipase, protease and lysozyme in a mass ratio of 1:1:1.

[0132] Comparative Example 4

[0133] Similar to Example 1, except that the double-layer microcapsule bio-enzyme enhancer is replaced with an enzyme solution that is not encapsulated by double-layer microcapsules. The enzyme solution is a mixture of amylase, protease and catalase in a mass ratio of 1:1:1.

[0134] Comparative Example 5

[0135] Same as Example 1, except that no multifunctional antibacterial additive is added.

[0136] Comparative Example 6

[0137] Similar to Example 1, except that in the multifunctional antibacterial additive, the amount of compound essential oil microcapsules added is 10g, and the amount of silver ion-loaded zeolite added is 30g; the compound essential oil microcapsules are prepared by mixing tea tree essential oil and rosemary essential oil in a mass ratio of 1:2.

[0138] Comparative Example 7

[0139] Similar to Example 1, except that the propellant is replaced by a mixture of propane and n-butane in a mass ratio of 3:8, and the amount of propellant added is 200g.

[0140] Comparative Example 8

[0141] Same as in Example 1, except that the propellant is replaced with 200g of tetrafluoropropylene.

[0142] Comparative Example 9

[0143] Similar to Example 1, except that the environmentally friendly and efficient foam cleaning agent is prepared from the following raw materials: 60g of composite surfactant, 25g of double-layer microcapsule bio-enzyme synergist, 35g of ethanol, 10g of sodium citrate, 5g of sodium bicarbonate, 4g of multifunctional antibacterial additive, 6g of hydroxyethyl cellulose, 3g of silicone foam stabilizer, 6g of benzalkonium chloride, 55g of limonene, 12g of modified polyether siloxane, 150g of propellant, and 700g of deionized water.

[0144] Comparative Example 10

[0145] Similar to Example 1, except that the environmentally friendly and efficient foam cleaning agent is prepared from the following raw materials: 100g of composite surfactant, 4g of double-layer microcapsule bio-enzyme synergist, 20g of ethanol, 15g of sodium citrate, 10g of sodium bicarbonate, 22g of multifunctional antibacterial additive, 0.5g of hydroxyethyl cellulose, 4g of silicone foam stabilizer, 7g of benzalkonium chloride, 45g of limonene, 18g of modified polyether siloxane, 200g of propellant, and 700g of deionized water.

[0146] Performance testing

[0147] 1. Cleaning power test and results

[0148] The test method follows GB / T 35833-2018. Using a syringe, 0.1 mL of the stain is evenly applied to the substrate, covering an area of ​​5 cm × 5 cm. The sample is allowed to dry at room temperature for 24 hours. Then, the coated sample is placed in a 40℃, 80% RH environment for 48 hours to enhance stain adhesion. Foam cleaner is applied at a concentration of 0.1 g / cm³. 2 Spray the solution onto the stained area; cover with a cotton cloth, run the friction machine 20 times, remove the cotton cloth, and after drying, test and evaluate the removal rate of coffee stains, grease, toner, apple juice, and milk stains.

[0149] The cleaning power test results of the environmentally friendly and efficient foam cleaning agents prepared by Examples 1-8 and Comparative Examples 1-10 are shown in Table 4.

[0150] Table 4 Results of Cleaning Power Measurement

[0151]

[0152]

[0153] The above experimental results show that the average cleaning power of Examples 1-8 ranges from 97.6% to 99.1%, with Example 1 showing the best average cleaning power at 99.1%. Comparative Examples 1-10 show an average cleaning power range of 72.8% to 86.9%, indicating poor cleaning power. For coffee stains, which are mainly tannic acid and pigment deposits, the synergistic decomposition of tannic acid by limonene and protease in Examples 1-8 resulted in high cleaning and decomposition effects. For grease stains, which mainly simulate engine oil or animal fat, Examples 1-8 used a combination of sodium α-olefin sulfonate and lipase to achieve a dual-pathway cleaning of grease through emulsification and enzymatic hydrolysis. For toner stains, which are mainly particulate stains, hydroxyethyl cellulose and silicone foam stabilizer in Examples 1-8 prolonged foam contact time and enhanced physical encapsulation. For apple juice stains, which are mainly sugars and pigments, surfactants and compound enzymes in the examples demonstrated good removal effects.

[0154] 2. Foam stability test:

[0155] The test method refers to GB / T 13173-2021. Spray 10g of the environmentally friendly and efficient foam cleaning agent into a graduated cylinder, and let it stand for 5 minutes in an incubator at 25℃, 35℃ and 45℃. Observe the retention rate.

[0156] The results of foam stability testing of the environmentally friendly and efficient foam cleaning agents prepared by Examples 1-8 and Comparative Examples 1-10 are shown in Table 5.

[0157] Table 5. Results of stability test.

[0158]

[0159]

[0160] The above experimental results show that the average stability range of Examples 1-8 is 94.0%-95.7%, with Example 1 exhibiting the best average stability at 95.7%. The average stability range of Comparative Examples 1-10 is 72.0%-86.6%. Examples 1-8 demonstrate significantly better temperature stability than Comparative Examples 1-10, and also exhibit lower high-temperature degradation rates. The environmentally friendly and efficient foam cleaning agents prepared in Examples 1-8 effectively improve foam durability through the combination of hydroxyethyl cellulose as a thickener, silicone foam stabilizer, modified polyether siloxane, and propellant.

[0161] 3. Antibacterial test

[0162] The test method follows GB 27948-2020. Frozen *Escherichia coli* and *Staphylococcus aureus* strains are inoculated into the culture medium and incubated at 37°C for 24 hours; then diluted with PBS buffer to 1×10⁻⁶. 8CFU / mL, 100μL of bacterial suspension was evenly coated onto automotive interior materials such as PVC, leather, and fabric surfaces, and dried at room temperature for 1 hour; at 0.1g / cm 2 Apply the solution evenly to the contaminated carrier, let it stand for 10 minutes, then scrape the treated area with a cotton swab to test the sterilization rate against Escherichia coli and Staphylococcus aureus.

[0163] The antibacterial properties of the environmentally friendly and efficient foam cleaning agents prepared by Examples 1-8 and Comparative Examples 1-10 are shown in Table 6.

[0164] Table 6 Results of antibacterial test

[0165]

[0166]

[0167] As shown in Table 8, Examples 1-8 can achieve a sterilization rate of 99.99% for all materials including PVC, leather, and fabrics, significantly exceeding that of Comparative Examples 1-10. The sterilization rates of Comparative Examples 7-10 range from 94.65% to 97.06%. The sterilization effects against Escherichia coli and Staphylococcus aureus are significantly higher than those of Comparative Examples 1-6. The components and ratios of the composite surfactant, double-layer microcapsule bio-enzyme synergist, and multifunctional antibacterial additive in Comparative Examples 1-6 are significantly different from those in Examples 1-8. The antibacterial test results show that the lack of composite enzyme preparation, enzyme preparation not being coated with double-layer microcapsules, single antibacterial components, and incomplete surfactant ratios all fail to effectively kill microorganisms on various materials inside the vehicle.

[0168] The above test results show that the environmentally friendly and efficient foam cleaning agent prepared in this application provides a broad-spectrum antibacterial effect through the compounding of composite surfactants, multifunctional antibacterial additives, benzalkonium chloride, and D-limonene, while reducing chemical residues through the natural ingredient D-limonene, which is in line with environmental protection trends. The combination of hydroxyethyl cellulose as a thickener, silicone foam stabilizer, modified polyether siloxane, and propellant not only improves foam durability but also utilizes polyether segments to quickly defoam under dynamic conditions, avoiding secondary pollution. The double-layer microcapsule encapsulation technology can protect the activity of biological enzymes, prolong their stability in the cleaning agent, and achieve a sustained-release effect. The modified polyether siloxane forms a nano-scale hydrophobic layer after cleaning, which has both dustproof and antistatic functions, reducing the need for secondary maintenance operations by users. This solution is superior to mainstream products on the market in key indicators such as cleaning ability, material safety, and environmental protection, and is especially suitable for low-volatility scenarios in automotive cabins.

[0169] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the present invention, they are protected by patent law.

Claims

1. A foam cleaning agent, characterized in that, It is prepared from the following raw materials in parts by weight: 55-65 parts deionized water, 7-10 parts composite surfactant, 0.5-2 parts bilayer microcapsule bio-enzyme synergist, 0.5-2 parts multifunctional antibacterial additive, 1-3 parts ethanol, 0.2-1 parts sodium citrate, 0.1-0.8 parts sodium bicarbonate, 0.1-0.5 parts hydroxyethyl cellulose, 0.1-0.3 parts silicone foam stabilizer, 0.3-1 parts benzalkonium chloride, 2-5 parts D-limonene, 0.5-1.5 parts modified polyether siloxane, and 18-25 parts propellant; The composite surfactant is prepared from the following raw materials in parts by weight: 3-5 parts cocamidopropyl betaine, 2-4 parts nonalkyl glucoside, and 1-3 parts sodium α-olefin sulfonate. The bilayer microcapsule bio-enzyme synergist is prepared by first coating the inner layer of the enzyme solution with sodium alginate microspheres, and then coating the outer layer with chitosan by electrostatic adsorption. The microcapsules are collected by centrifugation, washed three times with deionized water, and freeze-dried at -40 to -50°C for 18-24 hours. The enzyme solution is prepared by mixing lipase, protease and lysozyme in a mass ratio of 1:(1-2):(1-2). The inner layer of sodium alginate microspheres is prepared using the following technical solution: sodium alginate is mixed with an enzyme solution of 5-15% concentration, and magnetically stirred at 30-50℃ for 1-2 hours to form a homogeneous mixture. Droplet control is achieved using a microfluidic device, and the mixture is dropped into a 2% CaCl2 solution using a coaxial needle with an inner diameter of 0.4 mm. The droplet diameter is controlled at 200-300 μm. The mixture is then allowed to stand in the 2% CaCl2 solution for 30 minutes to crosslink and solidify, completing the inner layer encapsulation. The mass ratio of sodium alginate to enzyme solution is 3:(6-8). The outer layer of chitosan coating is achieved using the following technical solution: the inner layer of sodium alginate microspheres is transferred to a 2% chitosan acetic acid solution and stirred at low speed of 150-200 rpm for 20-30 min, where the chitosan forms an outer membrane through electrostatic adsorption; then a 0.5% TPP solution is added and stirred at low speed of 150-200 rpm for 15-20 min, where the anionic TPP crosslinks with the cationic chitosan, enhancing the mechanical strength of the membrane; The multifunctional antibacterial additive is made from composite essential oil microcapsules and silver ion-supported zeolite in a mass ratio of 1:(1-2). The composite essential oil microcapsules are prepared using the following technical solution: a saturated β-cyclodextrin solution is mixed with the compound essential oil, and the mixture is magnetically stirred at 500-800 rpm for 4-6 hours at 60-70℃, refrigerated at 4℃ for 12 hours to crystallize, filtered, and then freeze-dried; the mass ratio of the saturated β-cyclodextrin solution to the compound essential oil is 8:(1-2). The compound essential oil is composed of tea tree oil, rosemary oil, lemongrass oil and bergamot oil in a mass ratio of (4-6):(2-3):(2-3):0.5; The propellant is composed of propane and n-butane in a mass ratio of (3-4):

7.

2. A method for preparing the foam cleaning agent as described in claim 1, characterized in that, It includes the following steps: S1 Add deionized water to the reactor, heat to 40±2℃, add sodium citrate and sodium bicarbonate in sequence, stir at 180-220 rpm until completely dissolved, slowly add hydroxyethyl cellulose, stir at 400-500 rpm for 20-30 min to avoid clumping, and obtain a premixed aqueous phase; S2 Add the composite surfactant to the premixed aqueous phase prepared in S1, and use a high-shear emulsifier at 7000-9000 rpm for 5-10 min to form a homogeneous colloid. Add ethanol and D-limonene, and continue emulsifying at 7000-9000 rpm for 5-10 min to obtain dispersion A. S3: Dissolve the multifunctional antibacterial additive and benzalkonium chloride in modified polyether siloxane, mix with dispersion A prepared in S2, and magnetically stir at 300-500 rpm for 15-25 min to complete emulsification. Cool to 25℃, add the bilayer microcapsule bio-enzyme synergist, and stir at low speed of 80-150 rpm for 10-20 min to avoid microcapsule rupture. Add the silicone foam stabilizer and stir for 5-10 min to obtain dispersion B. S4. Finely adjust the pH of dispersion B to 6.5-7.5 with citric acid or sodium bicarbonate, and then pass it through a homogenizer at 20-30 MPa for 3 cycles to refine the particle size to ≤50 μm to obtain the slurry. S5 After filtering the liquid material prepared in S4, it is fed into the aerosol can, filled with propellant, sealed, and then tested for leaks in a 50°C water bath for 30 minutes before labeling and packaging.

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