A kitchen grease cleaner and its preparation method

Abstract

This invention relates to the field of detergent technology and discloses a kitchen grease cleaner and its preparation method. The kitchen grease cleaner comprises a block copolymer and a non-cationic surfactant, wherein the molecular chain of the block copolymer contains blocks formed by the self-polymerization of specific monomers A to C. This invention utilizes a block copolymer formed by the block copolymerization of specific monomers A to C, which can improve the cleaning power of the non-cationic surfactant on kitchen grease. This allows the kitchen grease cleaner to achieve a cleaning power level comparable to traditional products using strong alkalis and alcohol ether solvents without the addition of strong alkalis and alcohol ether solvents, thus combining the advantages of safety and environmental friendliness, no irritating odor, and rapid grease removal.

Description

Technical Field

[0001] This invention relates to the field of washing product technology, and in particular to a kitchen grease cleaner and its preparation method. Background Technology

[0002] Kitchen grease buildup forms sticky grease deposits on hard surfaces in the kitchen. These deposits undergo complex reactions such as oxidation and cross-linking during cooking, making them difficult to remove with ordinary cleaning agents. To improve their cleaning power, most kitchen degreasers contain large amounts of strong alkalis (such as sodium hydroxide) and alcohol ether solvents (such as ethylene glycol butyl ether). While strong alkalis and alcohol ether solvents are effective at removing heavy grease, they are highly irritating and pose safety hazards, potentially harming human health and the environment. Furthermore, using kitchen degreasers containing strong alkalis and alcohol ether solvents produces an unpleasant, pungent odor. Therefore, developing a highly efficient and safe kitchen degreaser that effectively removes grease while maintaining good safety and a pleasant odor is of significant practical and social value.

[0003] Patent CN117625319A discloses a low-irritation, solvent-free kitchen grease cleaner, composed of a surfactant, a corrosion inhibitor, and water. The surfactant is a combination of a nonionic surfactant and an amphoteric surfactant, with the nonionic surfactant including a combination of fatty alcohol polyoxyethylene ether and isomeric fatty alcohol polyoxyethylene ether. This formulation avoids the use of strong alkalis and alcohol ether solvents, reducing the irritation of the kitchen grease cleaner. However, its cleaning power for kitchen grease is insufficient, and it cannot replace products using strong alkalis and alcohol ether solvents in terms of performance. Summary of the Invention

[0004] To address the aforementioned technical problem—namely, the relatively low cleaning power of existing low-irritant kitchen degreasers that do not contain strong alkalis or alcohol ether solvents—this invention provides a kitchen degreaser that is safe, environmentally friendly, odorless, and fast at removing grease. It achieves a cleaning power level comparable to traditional strong alkali and alcohol ether solvent-based kitchen degreasers without using strong alkalis or alcohol ether solvents.

[0005] The specific technical solution of this invention is as follows: In a first aspect, the present invention provides a kitchen grease cleaner, comprising a block copolymer and a non-cationic surfactant; wherein the molecular chain of the block copolymer contains blocks formed by the self-polymerization of monomers A to C respectively: , In monomers A through C, R1 is independently selected from -H and -CH3, respectively; R2 is a C2-C8 alkyl group; M + For H + Or metal ions.

[0006] The block copolymer in this invention, when combined with a non-cationic surfactant, enhances the cleaning power of the non-cationic surfactant for kitchen grease. The specific mechanism is as follows: In the cleaning system, firstly, the hydrophilic segments of the block copolymer molecules (blocks formed by the self-polymerization of monomer A and monomer C) form a soluble complex with the hydrophilic groups of the surfactant through electrostatic interactions and / or hydrogen bonding. This synergistically reduces the surface tension of the system, increases the wetting rate and penetration depth, and expands the interaction interface. Secondly, the block copolymer adsorbs onto the surface of grease and substrate through electrostatic interactions (provided by the self-polymerized blocks of monomer A) and hydrophobic interactions (provided by the self-polymerized blocks of monomer B), replacing and disrupting the forces between the grease and substrate. This significantly reduces the adhesion strength of the grease and the resistance to grease removal. Synergistically with the coiling effect of the surfactant, this achieves rapid removal of dirt and prevents re-adhesion. Finally, the block copolymer further stabilizes and disperses the grease particles encapsulated by the surfactant through electrostatic interactions and the steric hindrance effect of the polymer chains, inhibiting their aggregation and redeposition, thus achieving thorough removal of dirt.

[0007] Non-cationic surfactants (various surfactants other than cationic surfactants) can exhibit the above-mentioned effects with the block copolymers of the present invention (i.e., the block copolymers can improve the cleaning power of non-cationic surfactants on kitchen oil stains), but they cannot be effective with cationic surfactants. Specifically: (1) Non-ionic surfactants are uncharged and there is no electrostatic repulsion between them and the block copolymers. At the same time, non-ionic surfactants can form weak intermolecular hydrogen bonds with the carboxyl and amide groups in the block copolymers, making the mixed micelles more densely arranged at the interface and not interfering with the directional adsorption of cationic segments on negatively charged substrates (such as glass, ceramics, and stainless steel), thus exhibiting stronger synergistic cleaning and film-forming anti-fouling effects. (2) Amphoteric surfactants have both positive and negative charges in their molecules, and can form charge-matched soluble mixed micelles with the block copolymers through weak electrostatic attraction. This improves the penetration and degreasing effect without destroying the orderly film formation of the block copolymers, resulting in a better synergistic effect. (3) Anionic surfactants have electrostatic attraction with the cationic segments of the block copolymers, but the block structure allows soluble ion pairs to be formed only locally with the anionic surfactants, avoiding the formation of insoluble precipitates. (4) The cationic surfactant and the cationic segments of the block copolymer have electrostatic repulsion. They compete for adsorption sites on negatively charged hard surfaces and dirt particles, and mutually exclude each other's effective adsorption. As a result, the block copolymer cannot form a continuous protective film on the substrate surface, and the surfactant is also difficult to effectively curl and peel off at the oil interface, showing obvious antagonistic effect, resulting in a significant decrease in the decontamination and anti-fouling effect.

[0008] Furthermore, unlike random copolymers, block copolymers have their segments formed by monomers A to C distributed in a concentrated manner. This is an important prerequisite for their synergistic effect (improving the cleaning power of non-cationic surfactants on kitchen grease). Specifically, the hydrophilic groups (from monomers A and C) and hydrophobic groups (from monomer B) of the block copolymer are segmented, which not only allows for precise control of the hydrophilic-hydrophobic balance at the interface, but also makes it easier to form an ordered arrangement at the interface, thereby forming an effective synergy with the surfactant. The concentrated cationic segments (blocks formed by the self-polymerization of monomer A) are more likely to form stable soluble ion pairs with anionic surfactants, more effectively synergistically reducing the surface tension of the system and improving the penetration ability of grease. The concentrated hydrophobic segments (blocks formed by the self-polymerization of monomer B) are more likely to interact with grease, reducing the adhesion strength between grease and substrate more quickly, assisting surfactants in the curling and peeling of grease, and the peeled grease is more easily encapsulated by the concentrated anionic segments, preventing grease from agglomerating or re-adhering.

[0009] As an optional implementation, the block copolymer has a weight-average molecular weight of 50,000 to 300,000 Da; in the monomers used to synthesize the block copolymer, monomer A accounts for 50 to 80 mol%, monomer B accounts for 10 to 30 mol%, and monomer C accounts for 10 to 30 mol%.

[0010] The effectiveness of the block copolymers of this invention largely depends on their molecular weight and the ratio between the monomers. Not all block copolymers with arbitrary molecular weights and monomer ratios can effectively improve the cleaning power of non-cationic surfactants on kitchen grease. Specifically: (1) When the molecular weight of the block copolymer is too small, its molecular chain is too short, making it difficult to effectively encapsulate and isolate oil stains together with the surfactant, resulting in poor oil stain removal effect; while when the molecular weight of the block copolymer is too large, its molecular chain is prone to entanglement, which will also affect its synergistic effect on the surfactant.

[0011] (2) Monomer B has a certain degree of hydrophobicity. A certain proportion of monomer B can promote the interaction between the block copolymer and the oil stain, and work synergistically with the coiling effect of the surfactant to promote the rapid removal of the oil stain. Monomer A and monomer C have a certain degree of hydrophilicity. A certain proportion of monomer A and monomer C can promote the block copolymer to form a soluble complex with the surfactant, thereby improving the wetting rate and penetration depth. When the ratio between the three monomers is not right, the block copolymer will affect the synergistic effect of the surfactant due to the excessive hydrophilic or hydrophobic effect.

[0012] As an optional implementation, the non-cationic surfactant is at least one of anionic surfactants, nonionic surfactants, and amphoteric surfactants.

[0013] As an optional embodiment, the anionic surfactant includes at least one of sodium alkylbenzene sulfonate, sodium alkyl sulfate, sodium fatty alcohol polyoxyethylene ether sulfate, sodium fatty acid methyl ester sulfonate, sodium secondary alkyl sulfonate, sodium alkenyl sulfonate, sodium N-lauroyl glutamate, sodium lauroyl sarcosinate, sodium fatty acid, sodium dioctyl sulfosuccinate, sodium fatty acid hydroxyethyl sulfonate, sodium N-alkanoyl-N-methyl taurate, and sodium fatty alcohol polyoxyethylene ether carboxylate.

[0014] As an optional implementation, the nonionic surfactant includes at least one of fatty alcohol polyoxyethylene ether, alkyl glycoside, N-alkyl-N-methyl glucose, sorbitan polyoxyethylene ether fatty acid ester, ethoxylated fatty amine, fatty alcohol polyoxyethylene polyoxypropylene ether, fatty acid methyl ester ethoxylate, alkanolamide, fatty acid glyceride and sucrose fatty acid ester.

[0015] As an optional implementation, the amphoteric surfactant includes at least one of cocamidopropyl betaine, alkyl dimethyl betaine, alkylamidopropyl hydroxysulfonyl betaine, alkylamidopropyl amine oxide, alkyl dimethyl amine oxide, alkyl dihydroxyethyl amine oxide, and alkoxypropyl dihydroxyethyl amine oxide.

[0016] As an optional implementation, the non-cationic surfactant includes anionic surfactants; in the kitchen grease cleaner, the content of block copolymer and non-cationic surfactant is 0.05~3.0wt% and 1~15wt%, respectively.

[0017] When the system contains anionic surfactants, if the block copolymer content is too high, it is easy to form an overly strong complex or even an insoluble precipitate with the anionic surfactant, reducing the effective concentration of the free surfactant. This results in the block copolymer being unable to effectively improve the cleaning power of the surfactant on kitchen grease, and may even exhibit an antagonistic effect (causing the surfactant to reduce its cleaning power on kitchen grease).

[0018] As an optional implementation, the kitchen grease cleaner further includes additives; the content of the additives in the kitchen grease cleaner is 0.1~15wt%; the additives include at least one of chelating agents, corrosion inhibitors, preservatives, pH adjusters, water-soluble growth promoters, antioxidants, antibacterial agents, lipolytic enzymes, fragrances and pigments.

[0019] Secondly, the present invention provides a method for preparing the kitchen grease cleaner described above, comprising: S1: Mix monomer A, initiator I and reaction solvent, prepolymerize, add monomer B and initiator II to continue polymerization, then add monomer C and initiator III to continue polymerization, separate the product to obtain block copolymer; S2: The block copolymer is mixed with other components to obtain a kitchen grease cleaner.

[0020] As an optional implementation, in step S1, the prepolymerization and polymerization temperatures are both 40~80℃; prepolymerization is carried out until the conversion rate of monomer A is ≥95%; monomer B and initiator are added to continue polymerization until the conversion rate of monomer B is ≥95%; monomer C and initiator III are added to continue polymerization until the conversion rate of monomer C is ≥95%.

[0021] As an optional implementation, in step S1, monomer B and initiator II are pre-dissolved in a reaction solvent before adding monomer B and initiator II; monomer C and initiator III are pre-dissolved in a reaction solvent before adding monomer C and initiator III.

[0022] As an optional implementation, in step S1, initiators I to III are each independently selected from at least one of azobisisobutyronitrile, azobisisoheptanenitrile, dimethyl azobisisobutyrate, terephthaloyl peroxide, and tert-butyl peroxide; the amount of initiators I to III is 0.5 to 2.5% of the total weight of monomers A to C.

[0023] Thirdly, the present invention provides the application of block copolymers in improving the cleaning power of non-cationic surfactants for kitchen grease, wherein the block copolymer is the block copolymer in the kitchen grease cleaner described above, or the block copolymer in the preparation method described above.

[0024] Compared with the prior art, the present invention has the following advantages: (1) The present invention uses a block copolymer formed by sequential polymerization of specific monomers A to C, which can improve the cleaning power of non-cationic surfactants on kitchen oil stains, so that kitchen oil stain cleaners can achieve a cleaning power level comparable to traditional strong alkali and alcohol ether solvents without adding strong alkali and alcohol ether solvents.

[0025] (2) By controlling the molecular weight and monomer ratio of the block copolymer within a specific range, the present invention can further enhance its synergistic effect on non-cationic surfactants, giving kitchen oil stain cleaner higher cleaning power.

[0026] (3) The kitchen oil stain cleaner of the present invention can ensure cleaning power while avoiding the use of strong alkali and alcohol ether solvents, which makes the kitchen oil stain cleaner less corrosive to hard aluminum, safe and environmentally friendly, and without irritating odor. Detailed Implementation

[0027] The present invention will be further described below with reference to embodiments.

[0028] First, the present invention relates to a kitchen grease cleaner, comprising a block copolymer and a non-cationic surfactant; wherein the molecular chain of the block copolymer contains blocks formed by the self-polymerization of the following monomers A to C: , In monomers A through C, R1 is independently selected from -H and -CH3, respectively; R2 is a C2-C8 alkyl group; M + For H + Or metal ions.

[0029] In some specific embodiments, the weight-average molecular weight of the block copolymer is 50,000 to 300,000 Da.

[0030] In some specific embodiments, in the monomers used to synthesize the block copolymer, monomer A accounts for 50-80 mol%, monomer B accounts for 10-30 mol%, monomer C accounts for 10-30 mol%, and the total percentage of monomers A to C is 100 mol.

[0031] In some specific embodiments, the metal ion is Na. + .

[0032] In some specific embodiments, the non-cationic surfactant is at least one selected from anionic surfactants, nonionic surfactants, and amphoteric surfactants. The anionic surfactants, nonionic surfactants, and amphoteric surfactants used in this invention are not specifically limited and can be conventional materials in the art, such as: The anionic surfactant may be selected from at least one of sodium alkylbenzene sulfonate, sodium alkyl sulfate, sodium fatty alcohol polyoxyethylene ether sulfate, sodium fatty acid methyl ester sulfonate, sodium secondary alkyl sulfonate, sodium alkenyl sulfonate, sodium N-lauroyl glutamate, sodium lauroyl sarcosinate, sodium fatty acid, sodium dioctyl sulfosuccinate, sodium fatty acid hydroxyethyl sulfonate, sodium N-alkanoyl-N-methyl taurate, and sodium fatty alcohol polyoxyethylene ether carboxylate. The nonionic surfactant may be selected from at least one of fatty alcohol polyoxyethylene ether, alkyl glycoside, N-alkyl-N-methyl glucose, sorbitol polyoxyethylene ether fatty acid ester, ethoxylated fatty amine, fatty alcohol polyoxyethylene polyoxypropylene ether, fatty acid methyl ester ethoxylate, alkanolamide, fatty acid glyceride and sucrose fatty acid ester. The amphoteric surfactant may be selected from at least one of cocamidopropyl betaine, alkyl dimethyl betaine, alkylamidopropyl hydroxysulfonyl betaine, alkylamidopropyl amine oxide, alkyl dimethyl amine oxide, alkyl dihydroxyethyl amine oxide, and alkoxypropyl dihydroxyethyl amine oxide.

[0033] In some specific embodiments, the non-cationic surfactant includes anionic surfactants; in the kitchen grease cleaner, the content of block copolymer and non-cationic surfactant is 0.05~3.0wt% and 1~15wt%, respectively.

[0034] In some specific embodiments, the kitchen grease cleaner further includes additives; the content of the additives in the kitchen grease cleaner is 0.1~15wt%; the additives include at least one selected from chelating agents, corrosion inhibitors, preservatives, pH adjusters, water-soluble growth promoters, antioxidants, antibacterial agents, lipolytic enzymes, fragrances, and pigments. The types of additives mentioned above in this invention are not specifically limited, and conventional materials in the art can be used, such as: The chelating agent may be selected from at least one of the following: tetrasodium glutamate diacetate, trisodium N,N-di(carboxymethyl)alanine, disodium ethylenediaminetetraacetate, sodium gluconate, aminotris(methylenephosphonic acid), diethylenetriaminepenta(methylenephosphonic acid), hexamethylenediaminetetra(methylenephosphonic acid), dihexamethylenetriaminepenta(methylenephosphonic acid), and 1-hydroxyethylidene-1,1-diphosphonic acid; if a chelating agent is used, its content in the kitchen degreaser may be 0.01~5 wt%. The corrosion inhibitor may be selected from at least one of sodium silicate, sodium metasilicate, triethanolamine, diisopropanolamine, benzotriazole, methylbenzotriazole, sodium molybdate, and isonononanoylaminohexanoate triethanolamine salt; if a corrosion inhibitor is used, its content in the kitchen grease cleaner may be 0.01~10wt%; The preservative may be selected from at least one of phenoxyethanol, methylisothiazolinone, methylchloroisothiazolinone, and benzisothiazolinone; if a preservative is used, its content in the kitchen grease cleaner may be 0.01~5wt%; The pH adjuster may be selected from at least one of citric acid, lactic acid, oxalic acid, hydrochloric acid, aminosulfonic acid, methanesulfonic acid, sodium carbonate, sodium bicarbonate, and monoethanolamine; if a pH adjuster is used, its content in the kitchen grease cleaner may be 0.01~10wt%; The water-soluble growth promoter can be selected from at least one of sodium xylenesulfonate, sodium isopropylbenzenesulfonate, and sodium toluenesulfonate; if a water-soluble growth promoter is used, its content in the kitchen grease cleaner can be 0.1~10wt%; The antioxidant may be selected from at least one of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester (antioxidant AT76), 2,6-di-tert-butyl-4-methylphenol (BHT), tert-butyl-4-hydroxyanisole (BHA), tert-butylhydroquinone (TBHQ), and tea polyphenols; if an antioxidant is used, its content in the kitchen grease cleaner may be 0.001~1wt%; The antibacterial agent may be selected from at least one of p-chlororesorcinol, p-chlororesorcinol, hydroxydichlorodiphenyl ether, hydroxytrichlorodiphenyl ether, triclocarban, and o-phenylphenol; if an antibacterial agent is used, its content in the kitchen grease cleaner may be 0.01~5wt%; The lipase may be selected from at least one of lipase, phospholipase, esterase, keratinase and pectin esterase; if lipase is used, its content in the kitchen oil stain cleaner may be 0.001~2wt%.

[0035] Second, the present invention relates to a method for preparing the kitchen grease cleaner described above, comprising: S1: Mix monomer A, initiator I and reaction solvent, prepolymerize, add monomer B and initiator II to continue polymerization, then add monomer C and initiator III to continue polymerization, separate the product to obtain block copolymer; S2: The block copolymer is mixed with other components to obtain a kitchen grease cleaner.

[0036] In some specific embodiments, in step S1, the prepolymerization and polymerization temperatures are both 40~80℃; prepolymerization is carried out until the conversion rate of monomer A is ≥95%; monomer B and initiator are added to continue polymerization until the conversion rate of monomer B is ≥95%; monomer C and initiator III are added to continue polymerization until the conversion rate of monomer C is ≥95%.

[0037] In some specific embodiments, in step S1, monomer B and initiator II are pre-dissolved in a reaction solvent before adding monomer B and initiator II; monomer C and initiator III are pre-dissolved in a reaction solvent before adding monomer C and initiator III.

[0038] In some specific embodiments, in step S1, initiators I to III are each independently selected from at least one of azobisisobutyronitrile, azobisisoheptanenitrile, dimethyl azobisisobutyrate, terephthaloyl peroxide, and tert-butyl peroxide; the amount of initiators I to III is 0.5 to 2.5% of the total weight of monomers A to C.

[0039] Third, the present invention relates to the application of block copolymers in improving the cleaning power of non-cationic surfactants for kitchen grease, wherein the block copolymer is the block copolymer in the kitchen grease cleaner described above, or the block copolymer in the preparation method described above.

[0040] The present invention will now be described with reference to specific embodiments and comparative examples. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0041] The test methods used in the following embodiments and comparative examples are as follows: (1) Odor irritation test: Odor irritation testing was conducted in a laboratory setting simulating actual use. In a 1-cubic-meter enclosed space, the odor was sprayed 10 times consecutively according to the instructions. Volunteers were randomly selected to evaluate the odor, with 10 volunteers per group. Odor irritation was scored according to the standards in Table 1, and the results were averaged. Odor irritation was determined based on the average score: 0-2 points indicated no irritation; 3-4 points indicated mild irritation; 5-6 points indicated moderate irritation; and 7-10 points indicated severe irritation.

[0042] Table 1 Scoring Criteria for Odor Irritation Test (2) Degreasing rate test: Grease was collected from the grease collection box of a restaurant's range hood and evenly coated onto a pre-washed, dried, and weighed stainless steel sheet. The coating weight was controlled at 0.4±0.1g. The sheet was then aged at 160℃ for 35 minutes, cooled to room temperature, and weighed. The grease-removing sheet was then immersed in a kitchen grease cleaner sample at 35℃ for 5 minutes, rinsed with clean water, dried at 75℃, cooled, and weighed. The grease removal rate was calculated.

[0043] (3) Alkalinity and corrosion test: Alkalinity (as Na2O) and corrosion amount (LY12 hard aluminum) were tested according to the corresponding methods in GB / T 35833.

[0044] Preparation Examples 1-13: Synthesis of Block Copolymers The block copolymers of Examples 1-13 were synthesized according to the following steps: Add methanol to a 500 mL round-bottom flask equipped with a mechanical stirrer, condenser, thermometer and dropping funnel, then add acrylamide propyltrimethylammonium chloride (monomer A), stir until dissolved, and then add a methanol solution containing an initiator (where the mass ratio of initiator to methanol is 1:50). Nitrogen gas was introduced and the temperature was raised to 40-80°C. The reaction was stirred under nitrogen protection until a sample was taken and the conversion rate of acrylamide propyltrimethylammonium chloride reached over 95%. Then, monomer B (in the general formula of monomer B shown above, R1 is -H, and R2 is shown in Table 2) and an initiator (the mass ratio of the initiator used in this step to the methanol used for pre-dissolution is 1:40) were added. The reaction was stirred again under nitrogen protection until a sample was taken and the conversion rate of monomer B reached over 95%. Finally, sodium methacrylate (monomer C) (pre-dissolved in methanol) and an initiator (the mass ratio of the initiator used in this step to the methanol used for pre-dissolution is 1:20) were added. The reaction was stirred again under nitrogen protection until a sample was taken and the conversion rate of sodium methacrylate reached over 95%. The reaction was then stopped. The reaction solution was then placed in a dialysis bag and dialyzed in deionized water for 3 days. The solution was then freeze-dried to obtain the block copolymer (the block copolymers obtained in Preparation Examples 1-13 are referred to as Block Copolymers 1-13, respectively).

[0045] In Preparation Examples 1-13, the amounts of each reactant are shown in Table 2 (where the amounts of monomers A-C are the percentage of the molar amount of that monomer in the total molar amount of monomers A-C, and the amount of initiator in each step refers to the percentage of the weight of the initiator in each step relative to the total weight of monomers A-C). The weight-average molecular weight (M) of the final product was determined by gel permeation chromatography (GPC). w The results are shown in Table 2.

[0046] Table 2. Amounts of reactants and molecular weights of products in the synthesis of block copolymers. Preparation Example 14: Synthesis of Random Copolymers The random copolymer of Example 14 was synthesized according to the following steps: Methanol was added to a 500 mL round-bottom flask equipped with a mechanical stirrer, condenser, thermometer, and dropping funnel. Monomers A, B, and C (the selection and amount of monomers A-C were the same as in Preparation Example 2) were then added. After stirring until homogeneous, a methanol solution containing an initiator was added (the mass ratio of initiator to methanol was 1:100, and the amount of initiator was 1.0 wt% of the total weight of monomers A-C). Nitrogen gas was introduced and the temperature was raised to 65 °C. The reaction was stirred under nitrogen protection until a sample was taken and the conversion rate of monomers A-C reached over 95%. The reaction was then stopped. The reaction solution was then placed in a dialysis bag and dialyzed in deionized water for 3 days. The resulting random copolymer was lyophilized, and its weight-average molecular weight (Mb) was determined by gel permeation chromatography (GPC).w The value is 285000Da.

[0047] Examples 1-8 and Comparative Examples 1-4: Preparation and Performance Testing of Kitchen Grease Cleaners According to the formulations in Table 3 (wherein, block copolymers 1-8 were prepared from preparation examples 1-8, and random copolymers were prepared from preparation example 14), the components were mixed evenly to obtain the kitchen grease cleaners of Examples 1-8 and Comparative Examples 1-4.

[0048] Table 3 Kitchen grease cleaner formulation Kitchen grease cleaners from Examples 1-8 and Comparative Examples 1-4 were evaluated for odor irritation, and tested for degreasing rate, alkalinity (as Na2O), and corrosion amount (LY12 hard aluminum). The results are shown in Table 4.

[0049] Table 4 Performance test results of kitchen grease cleaner From the test results of Examples 1-8 and Comparative Examples 1-4, it can be seen that: (1) The degreasing rates of Examples 1-8 were significantly higher than those of Comparative Example 4, which did not contain the block copolymer of the present invention, and also higher than those of Comparative Example 1, which used an anionic homopolymer (sodium polyacrylate), and Comparative Example 3, which used a cationic homopolymer (polyquaternium-73). This indicates that the block copolymer of the present invention, which is polymerized from specific monomers A-C, can improve the cleaning power of kitchen oil stain cleaner. This is because the block copolymer of the present invention can improve the cleaning power of non-cationic surfactants for kitchen grease. In the cleaning system, firstly, the hydrophilic segments (blocks formed by the self-polymerization of monomer C) in the block copolymer molecule and the hydrophilic groups of the surfactant form a soluble complex through electrostatic interaction and hydrogen bonding, which synergistically reduces the surface tension of the system, increases the wetting rate and penetration depth, and expands the interaction interface. Secondly, the block copolymer is adsorbed onto the surface of grease and substrate through electrostatic interaction (provided by the blocks formed by the self-polymerization of monomer A) and hydrophobic interaction (provided by the blocks formed by the self-polymerization of monomer B), replacing and destroying the interaction force between grease and substrate, significantly reducing the adhesion strength of grease, reducing the resistance to grease removal, and synergistically with the coiling effect of the surfactant to achieve rapid removal of dirt and prevent dirt from re-adhering. Finally, the block copolymer further stabilizes and disperses the grease particles wrapped by the surfactant through electrostatic interaction and the steric hindrance effect of the polymer chain, inhibiting their aggregation and redeposition, and achieving thorough removal of dirt.

[0050] (2) Compared with Comparative Example 4, the addition of cationic homopolymer (polyquaternary ammonium salt-73) to Comparative Example 3 actually reduced the cleaning power of kitchen oil stains. This is because in the process of synergistic cleaning with surfactants, the high-density positively charged groups of cationic homopolymers are prone to strong electrostatic complexation with anionic surfactants, forming excessively strong complexes or even insoluble precipitates, reducing the effective concentration of free surfactants in the system. As a result, not only is synergistic effect not achieved, but the core cleaning ability of surfactant emulsification, curling and peeling is weakened.

[0051] (3) In Comparative Example 2, the block copolymers in Examples 1-8 were replaced with random copolymers polymerized from the same three monomers. The cleaning power of the random copolymers was significantly reduced and was similar to that of Comparative Example 4 without added copolymers. This indicates that the form of the block copolymer is an important prerequisite for improving the cleaning power of non-cationic surfactants. The reason is that the hydrophilic groups (from monomer C) and hydrophobic groups (from monomer B) of the block copolymer are segmented, which can not only precisely control the hydrophilic-hydrophobic balance at the interface, but also more easily form an ordered arrangement at the interface, thereby forming an effective synergy with the surfactant. The concentrated cationic segments (blocks formed by self-polymerization of monomer A) are more likely to form stable soluble ion pairs with anionic surfactants, more effectively synergistically reducing the surface tension of the system and improving the penetration ability of oil stains. The concentrated hydrophobic segments (blocks formed by self-polymerization of monomer B) are more likely to interact with oil stains, reduce the adhesion strength between oil stains and substrates more quickly, assist the surfactant in the curling and peeling of oil stains, and the peeled oil stains are more likely to be wrapped by the concentrated anionic segments, avoiding oil stains from agglomerating or re-adhering.

[0052] Examples 9-16 and Comparative Examples 5-7: Preparation and Performance Testing of Kitchen Grease Cleaners According to the formulation in Table 5 (wherein, block copolymer 1 was prepared from Preparation Example 1), the components were mixed evenly to obtain the kitchen grease cleaners of Examples 9-16 and Comparative Examples 5-7.

[0053] Table 5 Kitchen grease cleaner formulation Kitchen grease cleaners from Examples 9-16 and Comparative Examples 5-7 were evaluated for odor irritation, and tested for degreasing rate, alkalinity (as Na2O), and corrosion amount (LY12 hard aluminum). The results are shown in Table 6.

[0054] Table 6 Performance Test Results of Kitchen Grease Cleaners From the test results of Examples 9-16 and Comparative Examples 5-7, it can be seen that: (1) Compared with Comparative Example 5, the degreasing rate of Comparative Example 6 was not significantly improved. It is speculated that this may be due to the low amount of block copolymer added, which failed to produce a significant degreasing and synergistic effect on the surfactant.

[0055] (2) Compared with Comparative Example 5, the degreasing rate of Comparative Example 7 decreased. It is speculated that the excessive block copolymer is likely to form an overly strong complex or even an insoluble precipitate with the anionic surfactant in the system, reducing the effective concentration of free surfactant and thus causing the degreasing effect to decrease in the opposite direction.

[0056] (3) When the content of the block copolymer is in the range of 0.05~2.5wt% (Examples 9~15), as its content increases, the synergistic effect on the surfactant increases, and the degreasing effect of the kitchen oil stain cleaner is enhanced, and all are better than the case without the addition of block copolymer (Comparative Example 5). When the content of the front copolymer is in the range of 2.5~3.0wt% (Examples 15~16), the degreasing effect reaches a plateau, and as the content of the front copolymer increases, the degreasing effect of the kitchen oil stain cleaner no longer shows a significant improvement.

[0057] Examples 17-20 and Comparative Examples 8-11: Preparation and Performance Testing of Kitchen Grease Cleaners According to the formulation in Table 7 (wherein, block copolymer 2 was prepared from preparation example 2), the components were mixed evenly to obtain the kitchen grease cleaners of Examples 17-20 and Comparative Examples 8-11.

[0058] Table 7 Kitchen grease cleaner formulation Kitchen grease cleaners from Examples 17-20 and Comparative Examples 8-11 were evaluated for odor irritation, and their degreasing rate, alkalinity (as Na2O), and corrosion amount (LY12 hard aluminum) were tested. The results are shown in Table 6.

[0059] Table 8 Performance Test Results of Kitchen Grease Cleaners From the test results of Examples 17-20 and Comparative Examples 8-11, it can be seen that: Compared to kitchen grease cleaners that use strong alkalis and alcohol ether solvents, this invention uses a special block copolymer to replace strong alkalis and alcohol ether solvents, which eliminates the irritating odor of kitchen grease cleaners and effectively reduces their alkalinity and corrosiveness, while achieving cleaning power comparable to products using strong alkalis and alcohol ether solvents.

[0060] Comparative Examples 12-13: Preparation and Performance Testing of Kitchen Grease Cleaners According to the formula in Table 9 (wherein, block copolymer 1 was prepared from preparation example 1), the components were mixed evenly to obtain kitchen grease cleaners of comparative examples 12-13.

[0061] Table 9 Kitchen grease cleaner formulation Kitchen grease cleaners of comparative proportions 12-13 were tested for odor irritation, as well as degreasing rate, alkalinity (as Na2O) and corrosion amount (LY12 hard aluminum). The results are shown in Table 10.

[0062] Table 10 Performance Test Results of Kitchen Grease Cleaners From the test results of comparative examples 12-13, it can be seen that: When using cationic surfactants, the addition of the block copolymer of the present invention can actually reduce the cleaning power of kitchen grease cleaner. This is because the cationic surfactant and the cationic segments of the block copolymer have electrostatic repulsion, which leads to competition for adsorption sites on negatively charged hard surfaces and dirt particles. They mutually exclude each other's effective adsorption, resulting in the block copolymer being unable to form a continuous protective film on the substrate surface. The surfactant also has difficulty in effectively curling and peeling off at the grease interface, exhibiting a significant antagonistic effect.

[0063] Examples 21-22 and Comparative Examples 14-19: Preparation and Performance Testing of Kitchen Grease Cleaners According to the formulation in Table 11 (wherein, block copolymers 1-2 and 9-13 were prepared from preparation examples 1-2 and 9-13, respectively), the components were mixed evenly to obtain the kitchen grease cleaners of Examples 21-22 and Comparative Examples 14-19.

[0064] Table 11 Kitchen grease cleaner formulation The kitchen grease cleaners of Examples 21-22 and Comparative Examples 14-19 were evaluated for odor irritation, and tested for degreasing rate, alkalinity (as Na2O) and corrosion amount (LY12 hard aluminum). The results are shown in Table 12.

[0065] Table 12 Performance Test Results of Kitchen Grease Cleaners From the test results of Examples 21-22 and Comparative Examples 14-19, it can be seen that: (1) The degreasing rate of Comparative Examples 14-15 was significantly lower than that of Examples 21-22, indicating that when the molecular weight of the block copolymer is too large or too small, the cleaning power of the kitchen oil stain cleaner will be weakened. The reason is that when the molecular weight of the block copolymer is too small, its molecular chain is too short, making it difficult to effectively encapsulate and isolate the oil stains together with the surfactant, resulting in poor oil stain removal effect; while when the molecular weight of the block copolymer is too large, its molecular chain is prone to entanglement, which will also affect its synergistic effect on the surfactant.

[0066] (2) Comparative Examples 16-18: Based on Example 21, the ratio of the three monomers in the block copolymer synthesis process was changed. The oil removal rate of the obtained kitchen oil stain cleaner was significantly lower than that of Example 21. This is because, in terms of the block copolymer's ability to improve the cleaning power of the surfactant, the three blocks formed by the self-polymerization of the three monomers work together in a synergistic manner and play an important role. If the proportion of any monomer is too low or too high, the synergistic effect of the block copolymer on the surfactant will be weakened.

Claims

1. A kitchen grease cleaner, characterized in that, Including block copolymers and non-cationic surfactants; the molecular chains of the block copolymers contain blocks formed by the self-polymerization of the following monomers A to C respectively: ， In monomers A through C, R1 is independently selected from -H and -CH3, respectively; R2 is a C2-C8 alkyl group; M + For H + Or metal ions.

2. The kitchen grease cleaner according to claim 1, characterized in that, The block copolymer has a weight-average molecular weight of 50,000 to 300,000 Da; in the monomers used to synthesize the block copolymer, monomer A accounts for 50 to 80 mol%, monomer B accounts for 10 to 30 mol%, and monomer C accounts for 10 to 30 mol%.

3. The kitchen grease cleaner according to claim 1, characterized in that, The non-cationic surfactant is at least one of anionic surfactants, nonionic surfactants, and amphoteric surfactants.

4. The kitchen grease cleaner according to claim 3, characterized in that, The non-cationic surfactant includes anionic surfactants; in the kitchen oil stain cleaner, the content of block copolymer and non-cationic surfactant is 0.05~3.0wt% and 1~15wt%, respectively.

5. The kitchen grease cleaner according to claim 1 or 4, characterized in that, It also includes additives; the content of additives in the kitchen oil stain cleaner is 0.1~15wt%; the additives include at least one of chelating agents, corrosion inhibitors, preservatives, pH adjusters, water-soluble growth promoters, antioxidants, antibacterial agents, lipases, fragrances and pigments.

6. A method for preparing a kitchen grease cleaner according to any one of claims 1 to 5, characterized in that, include: S1: Mix monomer A, initiator I and reaction solvent, prepolymerize, add monomer B and initiator II to continue polymerization, then add monomer C and initiator III to continue polymerization, separate the product to obtain block copolymer; S2: The block copolymer is mixed with other components to obtain a kitchen grease cleaner.

7. The preparation method according to claim 6, characterized in that, In step S1, the prepolymerization and polymerization temperatures are both 40~80℃; prepolymerization is carried out until the conversion rate of monomer A is ≥95%; monomer B and initiator are added to continue polymerization until the conversion rate of monomer B is ≥95%; monomer C and initiator III are added to continue polymerization until the conversion rate of monomer C is ≥95%.

8. The preparation method according to claim 6, characterized in that, In step S1, monomer B and initiator II are pre-dissolved in a reaction solvent before adding monomer B and initiator II; monomer C and initiator III are pre-dissolved in a reaction solvent before adding monomer C and initiator III.

9. The preparation method according to claim 6, characterized in that, In step S1, initiators I to III are each independently selected from at least one of azobisisobutyronitrile, azobisisoheptanenitrile, dimethyl azobisisobutyrate, terephthaloyl peroxide, and tert-butyl peroxide; the amount of initiators I to III is 0.5 to 2.5% of the total weight of monomers A to C.

10. The application of block copolymers in improving the cleaning power of non-cationic surfactants for kitchen grease, characterized in that, The block copolymer is the block copolymer in the kitchen oil stain cleaner according to any one of claims 1 to 5, or the block copolymer in the preparation method according to any one of claims 6 to 9.

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