Carnauba wax for automobiles and preparation method thereof

Abstract

The present invention provides a carnauba wax for automobiles and a preparation method thereof, belonging to the field of automobile maintenance technology. The carnauba wax comprises: modified carnauba wax, an antistatic agent, a UV absorber, self-repairing hydrophobic microcapsules, an emulsifier, and deionized water. The carnauba wax for automobiles of the present invention combines polishing, antistatic, and UV resistance functions. After use, it can adhere to metal surfaces to protect vehicle paint. In addition, the carnauba wax can quickly self-repair its hydrophobic properties, protecting the vehicle paint surface from external environmental factors, maintaining the vivid color and brightness of the vehicle surface for a long time, and thus more effectively extending the vehicle's lifespan.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile maintenance, and particularly relates to carnauba wax for automobiles and a preparation method thereof. Background Art

[0002] Car paint maintenance is crucial for maintaining a vehicle's aesthetic appearance and extending its lifespan. With the development of the automotive industry and advancements in technology, paint maintenance has evolved beyond simple cleaning and waxing to encompass a comprehensive range of specialized procedures, from cleaning and polishing to varnishing. Metallic paints, particularly those containing metallic particles such as pearl or metallic paints, are widely popular for their unique luster and visual effects. However, these finishes are also more susceptible to environmental factors such as UV radiation, acid rain, oxidation, and everyday scratches. Therefore, maintaining metallic paint requires not only regular cleaning but also professional care to maintain its gloss and integrity.

[0003] While traditional car polish offers excellent gloss and hardness, it also suffers from shortcomings such as insufficient durability, difficult application, limited protection, and limited gloss enhancement. These limitations include the need for frequent re-application to maintain protection and gloss, the need for skillful application to avoid streaks or spots, and insufficient protection against the complex environments modern cars face, such as acid rain and bird droppings.

[0004] Patent CN104231942B discloses an antistatic and decontamination car wax and its preparation method. The wax is made from carnauba wax, polyethylene wax, polypropylene wax, fragrance, polyethylene oxide, conductive mica powder, an anti-UV agent, Marseille soap, oleic acid, dimethyl silicone oil emulsifier, solvent oil, paraffin wax, and water. The combined effects of these components provide decontamination, antistatic, and UV protection. Patent CN106085247B discloses an antistatic car polishing wax that combines cleaning and polishing, and its preparation method. The wax's components include an antistatic agent, an emulsion, a compounding liquid, a brightener, a UV absorber, a preservative, and deionized water. The resulting car polishing wax combines cleaning and dust removal, polishing, UV protection, antistatic, and sterilization, offering diverse functions. The above patents have improved traditional car polishes, making them easier and more convenient to use in daily life. However, the improved car polishes still have some defects. For example, the problem of poor self-repairing hydrophobic properties of the car polish has not been solved.

[0005] Therefore, improving the shortcomings of poor self-repairing hydrophobicity of traditional automobile polish is an urgent problem to be solved in the field of automobile maintenance technology. Summary of the Invention

[0006] To address the shortcomings of traditional car polishes, the present invention modifies natural carnauba wax and adds an antistatic agent, a UV absorber, self-repairing hydrophobic microcapsules, an emulsifier, and deionized water. This overcomes the shortcomings of current car polishes, which suffer from poor self-repairing hydrophobic properties. Specifically, the present invention's technical solutions include the following:

[0007] The present invention provides a method for preparing carnauba wax for automobiles, the method comprising the following steps:

[0008] The modified carnauba wax is ground into powder and then heated until completely melted, an antistatic agent and an ultraviolet absorber are added to the melted modified carnauba wax, and then the temperature is controlled at 85-90°C, and the mixture is stirred at 600-700 rpm for 0.5-1.5 hours to obtain a mixed solution 1; after the temperature of the mixed solution 1 is reduced to 40-50°C, self-repairing hydrophobic microcapsules are added and stirred at 700-750 rpm for 0.5-2 hours to obtain a mixed solution 2; after the mixed solution 2 is heated to 60-70°C, an emulsifier and deionized water are added for emulsification to obtain a mixed solution 3; the mixed solution 3 is ultrasonically defoamed to obtain the carnauba wax.

[0009] Preferably, the preparation method of the modified carnauba wax comprises the following steps:

[0010] 10 parts by weight of natural carnauba wax was weighed and dissolved in 100 parts by weight of ethanol, followed by the addition of sodium hydroxide solution, and the reaction was stirred at a pH of 11 and a temperature of 85°C for 4 hours. After the reaction was completed, the mixture was cooled to 25°C, and then dilute hydrochloric acid was added to a pH of 7. The mixture was filtered and washed, and dried at 60°C for 24 hours to obtain modified carnauba wax.

[0011] Preferably, the method for preparing the self-repairing hydrophobic microcapsules comprises the following steps:

[0012] Weigh 1 part by weight of aniline and add it to 500 parts by weight of deionized water, and adjust the pH value to 1 to obtain an aniline solution;

[0013] 100 parts by weight of polyethylene powder and 50 parts by weight of acrylic acid were added to 5000 parts by weight of xylene and stirred, and then 2 parts by weight of dibenzoyl peroxide were added. The mixture was stirred at 70° C. for 24 hours, filtered, and rinsed with acetone and toluene to obtain polyethylene grafted with carboxylic acid groups.

[0014] Then, 50 parts by weight of hexadecyl acrylate and 10 parts by weight of dibenzoyl peroxide were added, mixed and heated to 70° C. for reaction for 15 hours. After the reaction was completed, the modified polyethylene was filtered and washed to obtain the modified polyethylene.

[0015] 10 parts by weight of modified polyethylene were weighed and added to 500 parts by weight of xylene, heated to 70°C to dissolve it, 50 parts by weight of ammonium persulfate solution and 10 parts by weight of the aniline solution were added, and stirred at 60°C for 6 hours to prepare self-repairing hydrophobic microcapsules.

[0016] Preferably, the antistatic agent includes cetyltrimethylammonium bromide, octadecyltrimethylammonium chloride or cetyltrimethylammonium chloride.

[0017] Preferably, the ultraviolet absorber is UV-329.

[0018] Preferably, the emulsifier is Tween 60.

[0019] Preferably, the temperature of the deionized water is 60-70°C.

[0020] Preferably, the emulsification time is 1 to 2 hours.

[0021] Preferably, the ultrasound includes an ultrasound power of 500-800W and an ultrasound time of 1-2h.

[0022] Preferably, the weight ratio of the modified carnauba wax: antistatic agent: ultraviolet absorber: self-repairing hydrophobic microcapsule: emulsifier: deionized water is 10-40: 0.2-0.8: 0.1-0.6: 5-15: 5-10: 35-70.

[0023] Preferably, the weight ratio of the modified carnauba wax: antistatic agent: ultraviolet absorber: self-repairing hydrophobic microcapsule: emulsifier: deionized water is 30:0.5:0.5:10:10:35.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) Through ethanol transesterification modification, some long-chain fatty acid esters in natural carnauba wax are converted into acetates, and flexible groups are introduced, which improves the interaction between molecules, increases flexibility and ductility, and makes the coating formed on the surface of the car more flexible, thereby extending the service life of the wax layer.

[0026] (2) Chemical modification: Aniline and polyethylene grafted with carboxylic acid groups and containing hydrophobic groups are made into microcapsules with self-repairing hydrophobic function. Carboxylic acid groups and hydrophobic groups are introduced into polyethylene, which significantly enhances the hydrophobic properties of the material while better combining with aniline. Aniline molecules and carboxylic acid groups on the polyethylene surface are combined through various interaction forces such as hydrogen bonds and van der Waals forces, so that polyaniline can be stably deposited on the surface of modified polyethylene. Polyaniline also provides good self-repairing ability for carnauba wax. The addition of self-repairing hydrophobic microcapsules can not only improve the waterproof performance of the carnauba wax surface, but also automatically repair itself when scratched by external forces, maintain its hydrophobic properties, and achieve self-repairing of hydrophobic properties.

[0027] (3) The carnauba wax prepared by mixing modified carnauba wax, antistatic agent, ultraviolet absorber, self-repairing hydrophobic microcapsule, emulsifier and deionized water in the present invention is easier to apply evenly. The smooth application experience improves user satisfaction and makes the waxing process easier and faster. At the same time, the flexible coating can better resist the erosion of the external environment. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions of the present invention through the embodiments of the present invention. Obviously, the embodiments described 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0029] Unless otherwise specified, the raw materials and reagents used in the present invention are commercially available or can be prepared by known methods.

[0030] Natural carnauba wax was purchased from Shanghai Xinnuo Chemical Co., Ltd.

[0031] Preparation example:

[0032] The preparation method of modified carnauba wax specifically includes the following steps:

[0033] 10 parts by weight of natural carnauba wax was weighed and dissolved in 100 parts by weight of ethanol, followed by the addition of sodium hydroxide solution, and the reaction was stirred at a pH of 11 and a temperature of 85°C for 4 hours. After the reaction was completed, the mixture was cooled to 25°C, and then dilute hydrochloric acid was added to a pH of 7. The mixture was filtered and washed, and dried at 60°C for 24 hours to obtain modified carnauba wax.

[0034] The preparation method of self-repairing hydrophobic microcapsules specifically includes the following steps:

[0035] Weigh 1 part by weight of aniline and add it to 500 parts by weight of deionized water, and adjust the pH value to 1 to obtain an aniline solution;

[0036] 100 parts by weight of polyethylene powder and 50 parts by weight of acrylic acid were added to 5000 parts by weight of xylene and stirred, and then 2 parts by weight of dibenzoyl peroxide were added. The mixture was stirred at 70° C. for 24 hours, filtered, and rinsed with acetone and toluene to obtain polyethylene grafted with carboxylic acid groups.

[0037] Then, 50 parts by weight of hexadecyl acrylate and 10 parts by weight of dibenzoyl peroxide were added, mixed and heated to 70° C. for reaction for 15 hours. After the reaction was completed, the modified polyethylene was filtered and washed to obtain the modified polyethylene.

[0038] 10 parts by weight of modified polyethylene were weighed and added to 500 parts by weight of xylene, heated to 70°C to dissolve it, 50 parts by weight of ammonium persulfate solution (2 parts by weight of ammonium persulfate was dissolved in 100 parts by weight of deionized water to obtain an ammonium persulfate solution) and 10 parts by weight of aniline solution were added, and stirred at 60°C for 6 hours to obtain self-repairing hydrophobic microcapsules.

[0039] Example 1:

[0040] A method for preparing carnauba wax for automobiles, comprising the following steps:

[0041] Weigh 30 parts by weight of modified Brazilian palm wax and grind it into powder, then heat it until it is completely melted, add 0.5 parts by weight of hexadecyltrimethylammonium bromide and 0.5 parts by weight of UV-329 to the melted modified Brazilian palm wax, and then control the temperature at 90°C and stir and mix at a speed of 700 rpm for 1.5 hours to obtain a mixed solution 1. After the temperature of the mixed solution 1 drops to 50°C, add 10 parts by weight of self-repairing hydrophobic microcapsules and stir and mix at a speed of 750 rpm for 2 hours to obtain a mixed solution 2. After the mixed solution 2 is heated to 70°C, add 10 parts by weight of Tween60 and 35 parts by weight of deionized water at a temperature of 70°C and emulsify for 2 hours to obtain a mixed solution 3. The mixed solution 3 is ultrasonically defoamed in an ultrasonic environment with a power of 800 W for 2 hours to obtain Brazilian palm wax.

[0042] Example 2:

[0043] A method for preparing carnauba wax for automobiles, comprising the following steps:

[0044] Weigh 10 parts by weight of modified Brazilian palm wax and grind it into powder, then heat it until it is completely melted, add 0.2 parts by weight of octadecyltrimethylammonium chloride and 0.1 parts by weight of UV-329 to the melted modified Brazilian palm wax, and then control the temperature at 87°C, stir and mix at a speed of 600 rpm for 1 hour to obtain mixed solution 1, after the temperature of the mixed solution 1 drops to 45°C, add 5 parts by weight of self-healing hydrophobic microcapsules and stir and mix at a speed of 700 rpm for 0.5 hour to obtain mixed solution 2, after the mixed solution 2 is heated to 65°C, add 5 parts by weight of Tween60 and 35 parts by weight of deionized water at a temperature of 65°C and emulsify for 1.5 hours to obtain mixed solution 3, and defoam the mixed solution 3 in an ultrasonic environment with a power of 500 W for 1 hour to obtain Brazilian palm wax.

[0045] Example 3:

[0046] A method for preparing carnauba wax for automobiles, comprising the following steps:

[0047] Weigh 40 parts by weight of modified Brazilian palm wax and grind it into powder, then heat it until it is completely melted, add 0.8 parts by weight of hexadecyltrimethylammonium chloride and 0.6 parts by weight of UV-329 to the melted modified Brazilian palm wax, and then control the temperature at 85°C, stir and mix at a speed of 650 rpm for 0.5h to obtain mixed solution 1, after the temperature of the mixed solution 1 drops to 40°C, add 15 parts by weight of self-healing hydrophobic microcapsules and stir and mix at a speed of 720 rpm for 1h to obtain mixed solution 2, after the mixed solution 2 is heated to 60°C, add 10 parts by weight of Tween60 and 70 parts by weight of deionized water at a temperature of 60°C and emulsify for 1h to obtain mixed solution 3, and defoam the mixed solution 3 in an ultrasonic environment with a power of 650W for 1h to obtain Brazilian palm wax.

[0048] Example 4:

[0049] A method for preparing carnauba wax for automobiles, comprising the following steps:

[0050] Weigh 25 parts by weight of modified Brazilian palm wax and grind it into powder, then heat it until it is completely melted, add 0.5 parts by weight of hexadecyltrimethylammonium bromide and 0.6 parts by weight of UV-329 to the melted modified Brazilian palm wax, and then control the temperature at 85°C, stir and mix at a speed of 600 rpm for 1 hour to obtain mixed solution 1, after the temperature of the mixed solution 1 drops to 45°C, add 8 parts by weight of self-repairing hydrophobic microcapsules and stir and mix at a speed of 700 rpm for 1 hour to obtain mixed solution 2, after the mixed solution 2 is heated to 70°C, add 8 parts by weight of Tween60 and 50 parts by weight of deionized water at a temperature of 60°C and emulsify for 1 hour to obtain mixed solution 3, and defoam the mixed solution 3 in an ultrasonic environment with a power of 500 W for 2 hours to obtain Brazilian palm wax.

[0051] Comparative Example 1:

[0052] A method for preparing carnauba wax for automobiles, comprising the following steps:

[0053] The modified carnauba wax in Example 1 was replaced with natural carnauba wax, and the other conditions remained the same as in Example 1.

[0054] Comparative Example 2:

[0055] A method for preparing carnauba wax for automobiles, comprising the following steps:

[0056] The self-repairing hydrophobic microcapsules in Example 1 were removed, and the other conditions remained the same as in Example 1.

[0057] Test Example 1: Self-repairing hydrophobic performance test

[0058] Plasma etching was used to simulate the destructive effects on the surface of carnauba wax, and the self-healing properties of its surface hydrophobicity were tested. The carnauba wax prepared in Examples 1 to 4 and the carnauba wax prepared in Comparative Examples 1 to 2 were coated on tinplate. The tinplate was placed in the etching chamber of a plasma etcher, vacuumed, and treated at a power of 100 W for 3 minutes. The tinplate was then removed for water contact angle testing. The etched tinplate was then left at 25°C for 12 hours and then tested for water contact angle. The test results are shown in Table 1.

[0059] Table 1. Self-repairing hydrophobic performance test results

[0060]

[0061] As can be seen from Table 1, after plasma etching, the water contact angle of the surface of each group of carnauba wax is significantly reduced to about 60°. However, after being placed in a 25°C environment for 12 hours, the carnauba wax prepared in Examples 1 to 4 of the present invention can be better restored to a hydrophobic state than the carnauba wax prepared in Comparative Example 2, and has excellent self-healing properties.

[0062] Test Example 2: Antistatic Effect Test

[0063] The carnauba wax prepared in Examples 1 to 4 and the carnauba wax prepared in Comparative Examples 1 to 2 were coated on 10 cm×10 cm steel plates, respectively, and surface resistance tests were performed. The test results are shown in Table 2.

[0064] Table 2. Antistatic effect

[0065]

[0066]

[0067] As can be seen from Table 2, the surface resistance of the carnauba wax prepared in Examples 1 to 4 of the present invention is significantly lower than that of commercially available car wax, and compared with the carnauba wax prepared in Comparative Examples 1 to 2, it also exhibits a significant antistatic effect. The carnauba wax prepared in Examples 1 to 4 exhibits good antistatic ability, can avoid the adsorption of dust and microorganisms, and can better maintain the gloss of the carnauba wax.

[0068] Test Example 3: UV resistance test

[0069] The carnauba wax prepared in Examples 1 to 4 and the carnauba wax prepared in Comparative Examples 1 to 2 were respectively coated on tinplate and subjected to UV aging test in a UV accelerated aging tester for 240 h. The appearance of the carnauba wax was observed, and the adhesion was tested according to GB / T 9286-1998. The test results are shown in Table 3.

[0070] Table 3. UV resistance test results

[0071]

[0072] As can be seen from Table 3, the surface appearance of the carnauba wax prepared in Examples 1 to 4 of the present invention did not change significantly after continuous ultraviolet irradiation, while the carnauba wax prepared in Comparative Examples 1 to 2 all fell off. This shows that the synergistic combination of the modified carnauba wax, self-repairing hydrophobic capsules and ultraviolet absorber of the present invention can further improve the anti-ultraviolet performance of the carnauba wax prepared in the present invention, fully reflecting the mutual synergistic effect of the various components in the carnauba wax.

[0073] The embodiments described above provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A method for preparing carnauba wax for automobiles, characterized in that: The preparation method comprises the following steps: The modified carnauba wax is ground into a powder and then heated until completely melted. An antistatic agent and an ultraviolet absorber are added to the melted modified carnauba wax. The temperature is then controlled at 85-90° C. and stirred to obtain a mixed solution 1. After the temperature of the mixed solution 1 drops to 40-50° C., self-repairing hydrophobic microcapsules are added and stirred to obtain a mixed solution 2. After the mixed solution 2 is heated to 60-70° C., an emulsifier and deionized water are added for emulsification to obtain a mixed solution 3. The mixed solution 3 is ultrasonically defoamed to obtain the carnauba wax. 10 parts by weight of natural carnauba wax was dissolved in 100 parts by weight of ethanol, followed by addition of sodium hydroxide solution, and the mixture was stirred and reacted at a pH of 11 and a temperature of 85° C. for 4 hours to obtain modified carnauba wax. 1 part by weight of aniline is added to 500 parts by weight of deionized water, and the pH value is adjusted to 1 to obtain an aniline solution; 100 parts by weight of polyethylene powder and 50 parts by weight of acrylic acid are added to 5000 parts by weight of xylene, mixed and stirred, and then 2 parts by weight of dibenzoyl peroxide are added, and stirred in a 70°C environment for 24 hours to obtain polyethylene with grafted carboxylic acid groups, followed by adding 50 parts by weight of hexadecyl acrylate and 2 parts by weight of dibenzoyl peroxide, and mixing and reacting to obtain modified polyethylene; 10 parts by weight of the modified polyethylene are weighed and added to 500 parts by weight of xylene, heated to 70°C to dissolve it, 50 parts by weight of ammonium persulfate solution and 10 parts by weight of the aniline solution are added, and stirred in a 60°C environment for 6 hours to obtain self-repairing hydrophobic microcapsules.

2. The method for preparing carnauba wax for automobiles according to claim 1, wherein: The antistatic agent includes hexadecyltrimethylammonium bromide, octadecyltrimethylammonium chloride or hexadecyltrimethylammonium chloride.

3. The method for preparing carnauba wax for automobiles according to claim 1, wherein: The ultraviolet absorber is UV-329.

4. The method for preparing carnauba wax for automobiles according to claim 1, wherein: The emulsifier is Tween 60.

5. The method for preparing carnauba wax for automobiles according to claim 1, wherein: The emulsification time is 1 to 2 hours.

6. The method for preparing carnauba wax for automobiles according to claim 1, wherein: The weight ratio of the modified carnauba wax: antistatic agent: ultraviolet absorber: self-repairing hydrophobic microcapsule: emulsifier: deionized water is 10-40: 0.2-0.8: 0.1-0.6: 5-15: 5-10: 35-70.

7. The method for preparing carnauba wax for automobiles according to claim 1, wherein: The weight ratio of the modified carnauba wax: antistatic agent: ultraviolet absorber: self-repairing hydrophobic microcapsule: emulsifier: deionized water is 30:0.5:0.5:10:10:

35.

8. A carnauba wax prepared by the method for preparing carnauba wax for automobiles according to any one of claims 1 to 7.

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