Car cover surface care agent and preparation method thereof

Abstract

The invention discloses a vehicle cover surface care agent and a preparation method thereof, and belongs to the technical field of vehicle cleaning agent preparation. Comprising the following preparation steps: mixing and stirring a water-soluble surfactant mixture and a biological mixed enzyme to form a mixed solution, mixing the mixed solution and cyclodextrin to form dispersion liquid, and mixing and stirring the dispersion liquid to obtain embedding liquid; the embedding liquid is sequentially oxidized and dialyzed through sodium periodate to obtain a dialysis product, and the dialysis product, a diamine cross-linking agent, dimethyl sulfoxide and anhydrous sodium sulfate are mixed and stirred to react to obtain a mixed solution; diluting the mixed solution into feed liquid, and performing spray drying treatment to obtain the automobile cover surface care agent. According to the preparation method, the bio-enzyme with the function of decomposing grease and protein is wrapped, and then water-soluble and high-temperature-resistant modification is carried out, so that the environment-friendly vehicle cover surface care agent capable of decomposing greasy dirt and animal waste is prepared.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle cleaning agent preparation, and in particular relates to a vehicle cover surface care agent and a preparation method thereof. Background Art

[0002] With the rapid development of the automobile industry in recent years, family cars have entered thousands of households and become a must-have for people's lives and transportation. Daily cleaning and maintenance of various parts of the car have become an important part of car beauty and the basis of subsequent beauty. From a basic theoretical point of view, car washing with car detergent is a complex process of interaction between chemical and physical phenomena. Due to the different structures of various parts of the car, the cleaning agent used also needs to be reasonably selected according to the structure of each part. If the cleaning agent is improperly selected or used, the impact that may be caused by the inability to play a cleaning role is relatively small, but the destructive effect on the structure of the car itself will cause irreversible economic and safety losses. When cleaning the surface of the car body, due to the characteristics of modern car body paint, no matter what kind of car body paint, ordinary cleaning products containing large alkaline components such as washing powder and detergent cannot be used. Long-term use of these cleaning products to wash the car will make the car body paint lose its luster, and in severe cases, the car paint will dry and crack. Various cleaning liquids with surfactants as the main cleaning ingredients have been developed in the prior art.

[0003] Patent CN110157560A discloses a stubborn stain cleaning agent for automobiles. The invention uses a certain weight proportion of alkylphenol polyoxyethylene ether, sodium silicate, disodium hydrogen phosphate, diatomaceous earth, calcium hydroxide, turpentine, sodium xylene sulfonate, modified coconut acyl diethanolamine, fatty acid potassium and water as raw materials, and after mixing and stirring, a cleaning agent with good cleaning function is obtained.

[0004] Patent CN110747072A discloses an environmentally friendly car detergent. The invention uses camellia saponin, soapberry saponin, sodium perborate, sodium carbonate, lauryl glucoside, sodium polyoxyethylene fatty alcohol ether sulfate, fatty acid methyl sulfonate, coconut oil fatty acid diethanolamide, sorbitan monolaurate, sec-butyl alcohol, wood vinegar, enzyme, black tiger extract, acacia mangium tannin, flavor, preservative and deionized water as raw materials, and obtains an environmentally friendly car detergent by heating, stirring and mixing.

[0005] Patent CN112375632A discloses an environmentally friendly bio-based cleaning aerosol and a preparation method. The invention disperses soapberry saponin, alkyl polyglycosides, and cocamidopropyl betaine surfactant in chitosan and carboxymethyl cellulose to preform a glue solution. At the same time, alkaline electrolyzed water is added to the aerosol by low-speed stirring. The alkaline electrolyzed water has the characteristics of small molecular clusters and can easily penetrate stains. On the one hand, the foam formed in the aerosol allows the alkaline electrolyzed water to fully contact the stains. On the other hand, its small molecule permeability helps accelerate the emulsification and dissolution of the stains, prompting stubborn stains to fall off quickly.

[0006] Patent CN115322843A discloses an automobile maintenance cleaning agent and a preparation method thereof. The invention uses alcohol substances, corrosion inhibitors, surface tension regulators, stabilizers, activators and water as raw materials, and obtains a cleaning agent that can clean all parts of the vehicle through mixing and stirring.

[0007] Due to the influence of the outdoor environment, there are often organic substances such as grease and animal feces (containing undigested protein and lipids such as phospholipids) attached to the surface of the car paint. After such substances are cleaned with general chemical surfactants, there are still some oil films or spots that cannot be completely cleaned. This is largely because the surfactant mainly plays the role of wetting and reducing surface tension, which has a good cleaning and removal effect on mud or dust, but for organic pollutants such as grease and animal feces (the protein contained in bird droppings has a certain coagulation effect, and the feces often adheres tightly and hard to the car cover after drying), the penetration effect is poor and the cleaning is not thorough. If an alkaline detergent is used, although the decontamination ability is strong and it can decompose organic matter such as grease, the effect can be greatly improved, but due to the high corrosiveness of alkaline detergents, long-term use will make the car cover on the surface of the car paint lose its luster, accelerate aging, and affect the service life of the car cover and the protection of the car cover to the car paint.

[0008] Therefore, developing a car cover surface care agent that can decompose oil stains and animal feces is of great significance for improving the service life of car covers and protecting car paint. Summary of the invention

[0009] In view of the shortcomings of the prior art, the present invention encapsulates a biological enzyme with the function of decomposing oil and protein, and then performs water-solubility and high-temperature resistance modification to prepare an environmentally friendly car cover surface care agent that decomposes oil stains and animal feces, so as to solve the technical problems raised in the background technology. Specifically, the technical solution of the present invention includes the following contents: One of the purposes of the present invention is to provide a method for preparing a car cover surface care agent, the preparation method comprising the following steps: The water-soluble surfactant mixture and the biological mixed enzyme are mixed and stirred to form a mixed solution, the mixed solution is mixed with cyclodextrin to form a dispersion, and the dispersion is mixed and stirred in a temperature environment of 20° C. to 25° C. for 2 h to 3 h to obtain an embedding solution; The embedding solution is sequentially oxidized with sodium periodate and dialyzed to obtain a dialyzed product, and the dialyzed product, a diamine crosslinking agent, dimethyl sulfoxide and anhydrous sodium sulfate are mixed and stirred for reaction at a temperature of 25±2° C. for 20 h to 24 h to obtain a mixed solution; After the mixed liquid is diluted into a slurry, the mixed liquid is spray-dried to obtain the car cover surface care agent.

[0010] Preferably, the water-soluble surfactant mixture is prepared by mixing tea saponin and soapberry saponin in a mass ratio of 1:1, and the water-soluble surfactant needs to contain an ortho-dihydroxy structure.

[0011] Preferably, the biological hybrid enzyme is composed of lipase, neutral protease and phospholipase C in a mass ratio of 1:0.5~0.8:0.5~0.8.

[0012] Preferably, the cyclodextrin comprises β-cyclodextrin or γ-cyclodextrin.

[0013] Preferably, the mass ratio of the water-soluble surfactant mixture: the biological mixed enzyme: the cyclodextrin is 1-4:1:8-9.

[0014] Preferably, the mass ratio of the water-soluble surfactant mixture to sodium periodate is 1:1-1.5.

[0015] Preferably, the conditions for the sodium periodate oxidation include an oxidation temperature of 20° C. to 30° C. and an oxidation time of 3 h to 5 h.

[0016] Preferably, the diamine cross-linking agent includes ethylenediamine or 1,3-propylenediamine.

[0017] Preferably, the mass ratio of the dialysis product: diamine cross-linking agent: dimethyl sulfoxide: anhydrous sodium sulfate is 1: 0.2-0.4: 6-8: 0.5-1.

[0018] Preferably, the process of diluting the mixed solution into the feed solution is to mix and stir the mixed solution with deionized water in a weight ratio of 5-15:85-95 to obtain the feed solution.

[0019] Preferably, the spray drying conditions include a feed rate of 300 mL / h to 400 mL / h and a drying temperature of 130° C. to 150° C.

[0020] The second object of the present invention is to provide a car cover surface care agent prepared by the method for preparing the car cover surface care agent.

[0021] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention uses a biological enzyme with the function of decomposing oil and protein as one of the active ingredients, and utilizes the hydrophobic cavity structure of cyclodextrin to mix and disperse cyclodextrin, soapberry saponin with surface active function, tea saponin and the biological enzyme in water to form a dispersion. The hydrophobic regional structure contained in the biological enzyme structure enters the cavity structure of cyclodextrin through hydrophobic interaction to achieve enzyme immobilization and encapsulation. Then, an oxidant is used to partially oxidize the ortho-dihydroxyl groups in the structures of cyclodextrin, soapberry saponin and tea saponin to break them to obtain functional group aldehyde groups. Finally, a diamine cross-linking agent is used to crosslink the oxidized cyclodextrin and soapberry saponin. A dynamic imine bond with a high-temperature resistant structure is generated by the Schiff base reaction with tea saponin. With the help of the synergistic cooperation of cyclodextrin encapsulation and the dynamic imine bond, the high-temperature activity protection of the biological enzyme is achieved, so that it can be prepared into a solid powdered car cover surface care agent that is easy to store and transport through a high-temperature spray drying process; and because of their good water solubility, soapberry saponin and tea saponin can modify the water solubility of cyclodextrin, so that the solid powdered car cover surface care agent prepared from them can be mixed and dissolved in water to form a cleaning liquid for cleaning the surface of automobile covers, thereby achieving the decomposition and removal of organic matter such as greasy substances and animal feces on the surface of the car cover.

[0022] (2) The present invention achieves the cleaning and removal of grease and animal feces on the surface of car covers by synergistically combining a plant-based water-soluble surfactant with a biological enzyme with a high-efficiency decomposition effect. Compared with the prior art that seeks to continuously synthesize new surfactants through chemical synthesis to improve the cleaning function, the present invention has the advantage of being environmentally friendly. This has guiding significance for the development of new environmentally friendly cleaning agents or cleaning liquids by means of encapsulation carriers and combining plant-based surfactants. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below through the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] Unless otherwise specified, the raw materials and reagents used in the present invention are commercially available or can be prepared by known methods.

[0025] Lipase, central protease, and phospholipase C were purchased from Shanghai Huashang Xiangyang Biotechnology Co., Ltd.; Preparation Example 1 Extraction of tea saponin: After the tea seeds are ground into powder, they are dried to constant weight. Then 100g of tea seed powder is weighed and placed in a container. Then 800g of petroleum ether is added and stirred until the tea seed powder is evenly dispersed. After being evenly dispersed, it is placed in a 70°C water bath and heated to reflux for 10 hours. After the reflux is completed, it is filtered while hot to obtain a solid residue. The solid residue is added with 10 times its own weight of anhydrous ethanol and mixed and stirred until the solid residue is completely dispersed, and then placed in a 70°C water bath and heated to reflux for 8 hours. After the reflux is completed, the filtrate is collected by hot filtration, and the filtrate is placed on a rotary evaporator to be concentrated to a viscous state, and then water is added and stirred to dissolve, and finally placed in a 45°C vacuum drying oven to dry to constant weight to obtain tea saponin crystals.

[0026] Preparation Example 2 Extraction of soapberry saponin: Rinse the soapberry peel and dry it to constant weight, then grind it, weigh 100g of soapberry powder and put it in a container, add 600g of deionized water and mix and stir until the soapberry powder is completely dispersed, then put it in a 70℃ water bath and heat it for 5h. After heating, separate the solid and liquid, add 6 times its own weight of deionized water to the residue and heat it in a 70℃ environment for 5h, and then separate the solid and liquid again. Combine the water extracts obtained from the two solid-liquid separations, then put it into a rotary evaporator to concentrate it to a viscous state, and then put it into a vacuum drying oven to dry to constant weight to obtain soapberry saponin crystals.

[0027] Preparation Example 3 Preparation of water-soluble surfactant mixture: Weigh 5 g of the tea saponin crystals obtained in Preparation Example 1 and 5 g of the soapberry saponin crystals obtained in Preparation Example 2, mix and blend to obtain a water-soluble surfactant mixture.

[0028] Preparation Example 4 Preparation of biological mixed enzymes: Use a pipette to take 1g of lipase, 0.5g of neutral protease and 0.5g of phospholipase C and mix them in an EP tube. Place the EP tube in a low-temperature tank at 5°C, replace the pipette tip, and use a pipette to gently blow and aspirate the enzyme in the EP tube 10 times to obtain a biological mixed enzyme.

[0029] Preparation Example 5 Preparation of biological mixed enzymes: Use a pipette to take 1g of lipase, 0.6g of neutral protease and 0.6g of phospholipase C and mix them in an EP tube. Place the EP tube in a low-temperature tank at 5°C, replace the pipette tip, and use a pipette to gently blow and aspirate the enzyme in the EP tube 10 times to obtain a biological mixed enzyme.

[0030] Preparation Example 6 Preparation of biological mixed enzymes: Use a pipette to take 1g of lipase, 0.7g of neutral protease and 0.7g of phospholipase C and mix them in an EP tube. Place the EP tube in a low-temperature tank at 5°C, replace the pipette tip, and use a pipette to gently blow and suck the enzyme in the EP tube 10 times to obtain a biological mixed enzyme.

[0031] Preparation Example 7 Preparation of biological mixed enzymes: Use a pipette to take 1g of lipase, 0.8g of neutral protease and 0.8g of phospholipase C and mix them in an EP tube. Place the EP tube in a low-temperature tank at 5°C, replace a new pipette tip, and use a pipette to gently blow and suck the enzyme in the EP tube 10 times to obtain a biological mixed enzyme.

[0032] Preparation Example 8 Preparation of biological mixed enzymes: Use a pipette to take 1g of lipase, 0.8g of alkaline protease and 0.8g of phospholipase C and mix them in an EP tube. Place the EP tube in a low-temperature tank at 5°C, replace the pipette tip, and use a pipette to gently blow and suck the enzyme in the EP tube 10 times to obtain a biological mixed enzyme.

[0033] Example 1 A preparation method of a car cover surface care agent specifically includes the following steps: Weigh 10g of the water-soluble surfactant mixture and add it to 800g of deionized water and stir evenly. Then take 10g of the biological mixed enzyme obtained in Preparation Example 4 and add it to the water-soluble surfactant solution and stir to form a mixed solution. Add 80g of β-cyclodextrin to the mixed solution and mix and stir until it is evenly dispersed to obtain a dispersion. Place the dispersion in a constant temperature bath at 20°C and stir at a speed of 50r / min for 2h to obtain an embedding solution.

[0034] The embedding solution was shielded from light with a black cloth to keep it in a dark environment. Then, 10g of sodium periodate was added to the light-shielded embedding solution, mixed and stirred evenly, and placed in a temperature environment of 20°C for a timed reaction of 3h. After the reaction was completed, 30g of ethylene glycol was added to quench the product, and then the product was poured into a dialysis bag with a molecular weight cutoff of 500Da, dialyzed with distilled water for 2 days, and then treated with a freeze dryer to obtain a dialysis product. Take 10g of ethylenediamine and dissolve it in 300g of dimethyl sulfoxide solution, then add 50g of the dialysis product and mix and disperse evenly, and finally add 25g of anhydrous sodium sulfate and mix and stir and place in a temperature environment of 25±2°C, and stir the reaction at a speed of 50r / min for 20h. After the reaction was completed, filter and wash to remove the anhydrous sodium sulfate solid after absorbing water to obtain a mixed solution.

[0035] Weigh 5 parts by weight of the mixed liquid and 95 parts by weight of deionized water, mix and stir to dilute into a liquid, and then feed it into a spray dryer at a feed rate of 300 mL / h. Control the drying temperature at 130°C until the liquid is completely dried into powder and stop drying to obtain a car cover surface care agent.

[0036] Example 2 A preparation method of a car cover surface care agent specifically includes the following steps: Weigh 15g of the water-soluble surfactant mixture and add it to 800g of deionized water and stir evenly. Then take 10g of the biological mixed enzyme obtained in Preparation Example 4 and add it to the water-soluble surfactant solution and stir to form a mixed solution. Add 82g of β-cyclodextrin to the mixed solution and stir until it is evenly dispersed to obtain a dispersion. Place the dispersion in a constant temperature bath at 20°C and stir at a speed of 60r / min for 2h to obtain an embedding solution.

[0037] The embedding solution was shielded from light with a black cloth to keep it in a dark environment. Then, 10g of sodium periodate was added to the light-shielded embedding solution, mixed and stirred evenly, and placed in a temperature environment of 20°C for a timed reaction of 3h. After the reaction was completed, 30g of ethylene glycol was added to quench the product, and then the product was poured into a dialysis bag with a molecular weight cutoff of 500Da, dialyzed with distilled water for 2 days, and then treated with a freeze dryer to obtain a dialysis product. Take 10g of ethylenediamine and dissolve it in 300g of dimethyl sulfoxide solution, then add 50g of the dialysis product and mix and disperse evenly, and finally add 30g of anhydrous sodium sulfate and mix and stir and place in a temperature environment of 25±2°C, and stir the reaction at a speed of 60r / min for 20h. After the reaction was completed, filter and wash to remove the anhydrous sodium sulfate solid after absorbing water to obtain a mixed solution.

[0038] Weigh 5 parts by weight of the mixed liquid and 95 parts by weight of deionized water, mix and stir to dilute into a liquid, and then feed it into a spray dryer at a feed rate of 320 mL / h. Control the drying temperature at 130°C until the liquid is completely dried into powder and stop drying to obtain a car cover surface care agent.

[0039] Example 3 A preparation method of a car cover surface care agent specifically includes the following steps: Weigh 20g of the water-soluble surfactant mixture and add it to 850g of deionized water and stir evenly. Then take 10g of the biomixed enzyme obtained in Preparation Example 5 and add it to the water-soluble surfactant solution and stir to form a mixed solution. Add 84g of β-cyclodextrin to the mixed solution and stir until it is evenly dispersed to obtain a dispersion. Place the dispersion in a constant temperature bath at 20°C and stir at a speed of 70r / min for 2h to obtain an embedding solution.

[0040] The embedding solution was shielded from light with a black cloth to keep it in a dark environment. Then, 12g of sodium periodate was added to the light-shielded embedding solution, mixed and stirred evenly, and placed in a temperature environment of 25°C for 4h. After the reaction was completed, 36g of ethylene glycol was added to quench the product, and then the product was poured into a dialysis bag with a molecular weight cutoff of 500Da, dialyzed with distilled water for 2 days, and then treated with a freeze dryer to obtain a dialysis product. 15g of ethylenediamine was dissolved in 350g of dimethyl sulfoxide solution, and then 50g of the dialysis product was added and mixed and dispersed evenly, and finally 35g of anhydrous sodium sulfate was added, mixed and stirred, and placed in a temperature environment of 25±2°C, and stirred at a speed of 70r / min for 22h. After the reaction was completed, the anhydrous sodium sulfate solid was filtered and washed to remove the water after absorbing water to obtain a mixed solution.

[0041] Weigh 10 parts by weight of the mixed liquid and 90 parts by weight of deionized water, mix and stir to dilute into a liquid, and then feed it into a spray dryer at a feed rate of 340 mL / h. Control the drying temperature at 140°C until the liquid is completely dried into powder and stop drying to obtain a car cover surface care agent.

[0042] Example 4 A preparation method of a car cover surface care agent specifically includes the following steps: Weigh 25g of the water-soluble surfactant mixture and add it to 850g of deionized water and stir evenly. Then take 10g of the biomixed enzyme obtained in Preparation Example 6 and add it to the water-soluble surfactant solution and stir to form a mixed solution. Add 86g of γ-cyclodextrin to the mixed solution and mix and stir until it is evenly dispersed to obtain a dispersion. Place the dispersion in a constant temperature bath at 25°C and stir at a speed of 80r / min for 3h to obtain an embedding solution.

[0043] The embedding solution was shielded from light with a black cloth to keep it in a dark environment. Then, 12g of sodium periodate was added to the light-shielded embedding solution, mixed and stirred evenly, and placed in a temperature environment of 25°C for a timed reaction of 4h. After the reaction was completed, 36g of ethylene glycol was added to quench the product, and then the product was poured into a dialysis bag with a molecular weight cutoff of 500Da, dialyzed with distilled water for 2 days, and then treated with a freeze dryer to obtain a dialysis product. 15g of 1,3-propylenediamine was dissolved in 350g of dimethyl sulfoxide solution, and then 50g of the dialysis product was added and mixed and dispersed evenly, and finally 40g of anhydrous sodium sulfate was added, mixed and stirred, and placed in a temperature environment of 25±2°C, and stirred at a speed of 80r / min for 22h. After the reaction was completed, the anhydrous sodium sulfate solid was filtered and washed to remove the water after absorbing water to obtain a mixed solution.

[0044] Weigh 10 parts by weight of the mixed liquid and 90 parts by weight of deionized water, mix and stir to dilute into a liquid, and then feed it into a spray dryer at a feed rate of 360 mL / h. Control the drying temperature at 140°C until the liquid is completely dried into powder and stop drying to obtain a car cover surface care agent.

[0045] Example 5 A preparation method of a car cover surface care agent specifically includes the following steps: Weigh 30g of the water-soluble surfactant mixture and add it to 900g of deionized water and stir evenly. Then take 10g of the biological mixed enzyme obtained in Preparation Example 6 and add it to the water-soluble surfactant solution and stir to form a mixed solution. Add 88g of γ-cyclodextrin to the mixed solution and stir until it is evenly dispersed to obtain a dispersion. Place the dispersion in a constant temperature bath at 25°C and stir at a speed of 90r / min for 3h to obtain an embedding solution.

[0046] The embedding solution was shielded from light with a black cloth to keep it in a dark environment. Then, 15g of sodium periodate was added to the light-shielded embedding solution, mixed and stirred evenly, and placed in a temperature environment of 30°C for a timed reaction of 5h. After the reaction was completed, 45g of ethylene glycol was added to quench the product, and then the product was poured into a dialysis bag with a molecular weight cutoff of 500Da, dialyzed with distilled water for 2 days, and then treated with a freeze dryer to obtain a dialysis product. Take 20g of 1,3-propylenediamine and dissolve it in 400g of dimethyl sulfoxide solution, then add 50g of the dialysis product and mix and disperse evenly, and finally add 45g of anhydrous sodium sulfate and mix and stir and place in a temperature environment of 25±2°C, and stir the reaction at a speed of 90r / min for 24h. After the reaction was completed, filter and wash to remove the anhydrous sodium sulfate solid after absorbing water to obtain a mixed solution.

[0047] Weigh 15 parts by weight of the mixed liquid and 85 parts by weight of deionized water, mix and stir to dilute into a liquid, and then feed it into a spray dryer at a feed rate of 380 mL / h. Control the drying temperature at 150°C until the liquid is completely dried into powder and stop drying to obtain a car cover surface care agent.

[0048] Example 6 A preparation method of a car cover surface care agent specifically includes the following steps: Weigh 40g of the water-soluble surfactant mixture and add it to 900g of deionized water and stir evenly. Then take 10g of the biomixed enzyme obtained in Preparation Example 7 and add it to the water-soluble surfactant solution and stir to form a mixed solution. Add 90g of γ-cyclodextrin to the mixed solution and stir until it is evenly dispersed to obtain a dispersion. Place the dispersion in a constant temperature bath at 25°C and stir at a speed of 100r / min for 3h to obtain an embedding solution.

[0049] The embedding solution was shielded from light with a black cloth to keep it in a dark environment. Then, 15g of sodium periodate was added to the light-shielded embedding solution, mixed and stirred evenly, and placed in a temperature environment of 30°C for a timed reaction of 5h. After the reaction was completed, 45g of ethylene glycol was added to quench the product, and then the product was poured into a dialysis bag with a molecular weight cutoff of 500Da, dialyzed with distilled water for 2 days, and then treated with a freeze dryer to obtain a dialysis product. Take 20g of 1,3-propylenediamine and dissolve it in 400g of dimethyl sulfoxide solution, then add 50g of the dialysis product and mix and disperse evenly, and finally add 50g of anhydrous sodium sulfate and mix and stir and place in a temperature environment of 25±2°C, and stir the reaction at a speed of 100r / min for 24h. After the reaction was completed, filter and wash to remove the anhydrous sodium sulfate solid after absorbing water to obtain a mixed solution.

[0050] Weigh 15 parts by weight of the mixed liquid and 85 parts by weight of deionized water, mix and stir to dilute into a liquid, and then feed it into a spray dryer at a feed rate of 400 mL / h. Control the drying temperature to 150°C until the liquid is completely dried into powder and stop drying to obtain a car cover surface care agent.

[0051] Comparative Example 1 A preparation method of a car cover surface care agent specifically includes the following steps: The biomixed enzyme in Example 6 was replaced by the biomixed enzyme obtained in Preparation Example 8, and the other conditions remained the same as in Example 6.

[0052] Comparative Example 2 A preparation method of a car cover surface care agent specifically includes the following steps: The γ-cyclodextrin in Example 6 was replaced by α-cyclodextrin, and the other conditions remained the same as in Example 6.

[0053] Comparative Example 3 A preparation method of a car cover surface care agent specifically includes the following steps: 40 g of the water-soluble surfactant mixture was weighed and added to 900 g of deionized water and stirred evenly. Then 10 g of the biomixed enzyme obtained in Preparation Example 7 was added to the water-soluble surfactant solution and stirred to form a mixed solution.

[0054] The mixed solution was shielded from light with a black cloth to place it in a dark environment. Then 15g of sodium periodate was added to the shading mixed solution, mixed and stirred evenly, and placed in a temperature environment of 30°C for 5h. After the reaction was completed, 45g of ethylene glycol was added to quench the product, and then the product was poured into a dialysis bag with a molecular weight cutoff of 500Da, dialyzed with distilled water for 2 days, and then treated with a freeze dryer to obtain a dialysis product. The obtained dialysis product was mixed with 90g of γ-cyclodextrin in 900g of deionized water and stirred until uniformly dispersed to obtain a dispersion, and the dispersion was placed in a constant temperature bath at 25°C and stirred at a speed of 100r / min for 3h to obtain an embedding solution.

[0055] Take 20g of 1,3-propylenediamine and dissolve it in 400g of dimethyl sulfoxide solution, then add 50g of embedding solution and mix and disperse evenly, finally add 50g of anhydrous sodium sulfate and stir, place in a temperature environment of 25±2℃, stir at a speed of 100r / min for 24h. After the reaction is completed, filter and wash to remove the anhydrous sodium sulfate solid that has absorbed water to obtain a mixed solution.

[0056] Weigh 15 parts by weight of the mixed liquid and 85 parts by weight of deionized water, mix and stir to dilute into a liquid, and then feed it into a spray dryer at a feed rate of 400 mL / h. Control the drying temperature to 150°C until the liquid is completely dried into powder and stop drying to obtain a car cover surface care agent.

[0057] Comparative Example 4 A preparation method of a car cover surface care agent specifically includes the following steps: The water-soluble surfactant mixture in Example 6 was replaced with cocamidopropyl betaine, and the other conditions remained the same as in Example 6.

[0058] The car cover surface care agents obtained in Examples 1 to 6 and Comparative Examples 1 to 4 were mixed with water, with the mass ratio of the car cover surface care agent to water being 1:20, and then the pH after the mixture was adjusted to 7.0 to 7.5 to obtain a cleaning solution. Vegetable oil and mineral oil were used as simulated automobile surface grease substances, and applied to the surface of the automobile body. Fresh bird droppings were collected and applied to different positions of the automobile body. After being placed in a natural environment for one day, the surface of the automobile body was first rinsed with water, and then the cleaning solution prepared above was evenly sprayed on the grease and solidified bird droppings. After the cleaning solution was left for 2 minutes, it was wiped and cleaned with a sponge, and then rinsed with clean water. The cleaning effect of stains on the surface of the automobile body was statistically analyzed, and the results are shown in Table 1 below.

[0059] Table 1 Statistics on the cleaning effect of stains on the body surface Sources Cleanliness of the car body surface after washing Example 1 There is no visible grease or oil on the windows, and there is no oil film. There are a few spots left after the bird droppings are cleaned up. Example 2 There is no visible grease, no oil film on the windows, and no bird droppings on the body. Example 3 There is no visible grease, no oil film on the windows, and no bird droppings on the body. Example 4 There is no visible grease, no oil film on the windows, and no bird droppings on the body. Example 5 There is no visible grease, no oil film on the windows, and no bird droppings on the body. Example 6 There is no visible grease, no oil film on the windows, and no bird droppings on the body. Comparative Example 1 A small amount of grease, some windows have oil film, bird droppings residue on a large area, poor cleaning effect Comparative Example 2 Obvious grease and oil film on the car windows. The solidified bird droppings are difficult to clean and the cleaning effect is poor. Comparative Example 3 Obvious grease and oil film on the car windows. The solidified bird droppings are difficult to clean and the cleaning effect is poor. Comparative Example 4 Obvious grease and oil film on the car windows. The solidified bird droppings are difficult to clean and the cleaning effect is poor. From the records of cleaning effects in the above table, we can see that: (1) The powdered solid car cover surface care agent prepared by Examples 1 to 6 of the present invention through the encapsulation of cyclodextrin and its constructed high temperature resistant structure and then through a high temperature spray drying process has good cleaning ability against oily substances and animal feces.

[0060] (2) It can be found from Comparative Example 1 that although alkaline protease also has the function of hydrolyzing the peptide bonds of proteins to degrade proteins, alkaline protease needs to be in a strong alkaline environment to exert good catalytic activity. After the car cover surface care agent prepared by the present invention is dissolved in water and the pH is adjusted to the range of 7.0-7.5, the alkaline protease activity is low, and the decomposition effect of proteins contained in animal feces is poor. If the pH environment is further increased, it will not only damage the surface of the car, but also the higher pH environment will have a certain degree of inactivation effect on lipase and phospholipase C, which may have a greater negative impact on the cleaning effect of the car cover surface care agent prepared by the present invention.

[0061] (3) It can be found from Comparative Example 2 that although α-cyclodextrin also has a hydrophobic cavity structure, compared with β-cyclodextrin and γ-cyclodextrin, the hydrophobic cavity structure is smaller, which may be poor for encapsulating large molecular proteins such as biological enzymes, resulting in poor cleaning effect of the prepared car cover surface care agent.

[0062] (4) It can be found from Comparative Example 3 that if the bio-hybrid enzyme is not pre-encapsulated, and the water-soluble surfactant mixture is directly oxidized with an oxidant and then encapsulated, the strong oxidizing property of sodium periodate may cause the conformation of the bio-hybrid enzyme to change, thereby affecting its catalytic activity, and ultimately resulting in the car cover surface care agent prepared by the present invention having a poor cleaning effect when relying solely on the water-soluble surfactant mixture.

[0063] (5) It can be found from Comparative Example 4 that although cocamidopropyl betaine has good surface activity and has good application in cleaning agents, since cocamidopropyl betaine does not contain vicinal dihydroxyl groups in its structure, sodium periodate cannot oxidize it to generate aldehyde groups. This results in the inactivation of the biological hybrid enzyme in the prepared powdered car cover surface care agent under the high temperature of spray drying. The cleaning effect is poor if it only relies on the surface activity of cocamidopropyl betaine.

[0064] The above-described embodiments provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected.

Claims

1. A method for preparing a car cover surface care agent, characterized in that: The preparation method comprises the following steps: The water-soluble surfactant mixture and the biological mixed enzyme are mixed and stirred to form a mixed solution, the mixed solution is mixed with cyclodextrin to form a dispersion, and the dispersion is mixed and stirred in a temperature environment of 20° C. to 25° C. for 2 h to 3 h to obtain an embedding solution; The embedding solution is sequentially oxidized with sodium periodate and dialyzed to obtain a dialyzed product, and the dialyzed product, a diamine crosslinking agent, dimethyl sulfoxide and anhydrous sodium sulfate are mixed and stirred for reaction at a temperature of 25±2° C. for 20 h to 24 h to obtain a mixed solution; After the mixed liquid is diluted into a slurry, the mixed liquid is spray-dried to obtain the car cover surface care agent.

2. The method for preparing a car cover surface care agent according to claim 1, characterized in that: The water-soluble surfactant mixture is prepared by mixing tea saponin and soapberry saponin in a mass ratio of 1:

1.

3. The method for preparing a car cover surface care agent according to claim 1, characterized in that: The biological mixed enzyme is composed of lipase, neutral protease and phospholipase C in a mass ratio of 1:0.5-0.8:0.5-0.

8.

4. The method for preparing a car cover surface care agent according to claim 1, characterized in that: The cyclodextrin includes β-cyclodextrin or γ-cyclodextrin.

5. The method for preparing a car cover surface care agent according to claim 1, characterized in that: The mass ratio of the water-soluble surfactant mixture: the biological mixed enzyme: the cyclodextrin is 1-4:1:8-9.

6. The method for preparing a car cover surface care agent according to claim 1, characterized in that: The mass ratio of the water-soluble surfactant mixture to sodium periodate is 1:1-1.

5.

7. The method for preparing a car cover surface care agent according to claim 1, characterized in that: The diamine cross-linking agent includes ethylenediamine or 1,3-propylenediamine.

8. The method for preparing a car cover surface care agent according to claim 1, characterized in that: The mass ratio of the dialysis product: diamine cross-linking agent: dimethyl sulfoxide: anhydrous sodium sulfate is 1: 0.2-0.4: 6-8: 0.5-1.

9. The method for preparing a car cover surface care agent according to claim 1, characterized in that: The spray drying conditions include a feed rate of 300 mL / h to 400 mL / h and a drying temperature of 130° C. to 150° C.

10. A car cover surface care agent prepared by the method for preparing a car cover surface care agent according to any one of claims 1 to 9.