Carnauba wax for automobiles and preparation method thereof

Abstract

The invention provides carnauba wax for automobiles and a preparation method of the carnauba wax, and belongs to the technical field of automobile maintenance, the carnauba wax comprises modified carnauba wax, an antistatic agent, an ultraviolet light absorber, a self-repairing hydrophobic microcapsule, an emulsifier and deionized water. The carnauba wax for the automobile integrates the functions of glazing, static electricity resistance, ultraviolet resistance and the like, can be attached to a metal surface to protect automobile paint after being used, and in addition, the carnauba wax can self-repair hydrophobic performance in a short time, protects the automobile paint surface from being influenced by external environmental factors, and has the advantages that the carnauba wax can be applied to the automobile, so that the service life of the automobile is prolonged, and the service life of the automobile is prolonged. The automobile surface color brightness is kept for a long time, so that the service life of the automobile is effectively prolonged.

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 an important part of maintaining the appearance of the vehicle and extending the life of the paint. With the development of the automobile industry and the advancement of technology, paint maintenance is no longer just simple cleaning and waxing, but covers a series of professional care procedures from cleaning, polishing to glazing. Metallic paints, especially those containing metal particles of pearl paint or metallic paint, are widely popular for their unique gloss and visual effects. However, these paints are also more susceptible to environmental factors such as ultraviolet radiation, acid rain erosion, oxidation and daily abrasions. Therefore, the maintenance of metallic paints requires not only regular cleaning, but also professional care measures to maintain its gloss and integrity.

[0003] Although traditional car polish has good gloss and hardness, it also has disadvantages such as insufficient durability, difficult application, limited protection and limited gloss improvement. These limitations are manifested in the need for frequent re-waxing to maintain protection and gloss, the need for more skills during application to avoid leaving streaks or spots, and insufficient protection against the complex environment faced by modern cars (such as acid rain, bird droppings, etc.).

[0004] Patent CN104231942B discloses an antistatic decontamination car wax and a preparation method thereof. The antistatic decontamination car wax is made of carnauba wax, polyethylene wax, polypropylene wax, essence, polyethylene oxide, conductive mica powder, anti-UV agent, Marseille soap, oleic acid, dimethyl silicone oil emulsifier, solvent oil, paraffin and water. Under the joint action of each component, it has decontamination ability, antistatic function and anti-ultraviolet function. Patent CN106085247B discloses an antistatic car polishing wax for cleaning and polishing and a preparation method thereof. The components of this car polishing wax include antistatic agent, emulsion, compound liquid, brightener, ultraviolet absorber, preservative and deionized water. The prepared car polishing wax integrates cleaning and dust removal, polishing, anti-ultraviolet, antistatic, sterilization and other functions, and has diversified functions. The above patents have improved the traditional car polish, making it easier and more convenient to use in daily life. However, the improved car polish still has some defects. For example, the problem of poor self-repairing hydrophobic performance of the car polish has not been solved.

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

[0006] Aiming at the defects of traditional car polish, the present invention modifies natural carnauba wax, adds antistatic agent, ultraviolet absorber, self-repairing hydrophobic microcapsule, emulsifier and deionized water, and solves the disadvantage of poor self-repairing hydrophobic performance of current car polish. Specifically, the technical solution of the present invention includes the following contents:

[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 and mixed at a speed of 600-700 rpm for 0.5-1.5 hours to obtain a mixed solution 1; after the temperature of the mixed solution 1 drops to 40-50°C, self-healing hydrophobic microcapsules are added and stirred and mixed at a speed of 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] Weigh 10 parts by weight of natural carnauba wax and dissolve it in 100 parts by weight of ethanol, then add sodium hydroxide solution, and stir the reaction at a pH of 11 and a temperature of 85°C for 4 hours. After the reaction is completed, cool to 25°C, then add dilute hydrochloric acid to a pH of 7, filter and wash, and dry 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 the mixture was stirred. Then 2 parts by weight of dibenzoyl peroxide were added, and the mixture was stirred at 70° C. for 24 hours. After filtering, the mixture was 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 obtain self-repairing hydrophobic microcapsules.

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

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

[0018] Preferably, the emulsifier is Tween60.

[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 ester exchange modification, some long-chain fatty acid esters in natural carnauba wax are converted into acetate, and flexible groups are introduced to improve the interaction between molecules, increase flexibility and ductility, make the coating formed on the surface of the car more flexible, and extend 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 can significantly enhance the hydrophobic properties of the material while better combining with aniline. Aniline molecules and carboxylic acid groups on the surface of polyethylene are combined through hydrogen bonds, van der Waals forces and other interaction 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 surface of carnauba wax, 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-healing 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 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.

[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 comprises the following steps:

[0033] Weigh 10 parts by weight of natural carnauba wax and dissolve it in 100 parts by weight of ethanol, then add sodium hydroxide solution, and stir the reaction at a pH of 11 and a temperature of 85°C for 4 hours. After the reaction is completed, cool to 25°C, then add dilute hydrochloric acid to a pH of 7, filter and wash, and dry at 60°C for 24 hours to obtain modified carnauba wax.

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

[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 the mixture was stirred. Then 2 parts by weight of dibenzoyl peroxide were added, and the mixture was stirred at 70° C. for 24 hours. After filtering, the mixture was 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] Weigh 10 parts by weight of modified polyethylene and add it to 500 parts by weight of xylene, heat it to 70°C to dissolve it, add 50 parts by weight of ammonium persulfate solution (weigh 2 parts by weight of ammonium persulfate and dissolve it in 100 parts by weight of deionized water to obtain an ammonium persulfate solution) and 10 parts by weight of aniline solution, and stir in an environment of 60°C for 6 hours to obtain self-healing hydrophobic microcapsules.

[0039] Embodiment 1:

[0040] A method for preparing carnauba wax for automobiles, specifically 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, then control the temperature at 90°C, 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-healing 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, and defoam the mixed solution 3 in an ultrasonic environment with a power of 800 W for 2 hours to obtain Brazilian palm wax.

[0042] Embodiment 2:

[0043] A method for preparing carnauba wax for automobiles, specifically 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, then control the temperature at 87°C, stir and mix at a speed of 600 rpm for 1 hour to obtain a 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 a 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 a 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] Embodiment 3:

[0046] A method for preparing carnauba wax for automobiles, specifically 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, then control the temperature at 85°C, stir and mix at a speed of 650 rpm for 0.5 h to obtain a 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 1 h to obtain a 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 1 h to obtain a mixed solution 3, and defoam the mixed solution 3 in an ultrasonic environment with a power of 650 W for 1 h to obtain Brazilian palm wax.

[0048] Embodiment 4:

[0049] A method for preparing carnauba wax for automobiles, specifically 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, then control the temperature at 85°C, stir and mix at a speed of 600 rpm for 1 hour to obtain a mixed solution 1, after the temperature of the mixed solution 1 drops to 45°C, add 8 parts by weight of self-healing hydrophobic microcapsules and stir and mix at a speed of 700 rpm for 1 hour to obtain a 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 a 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, specifically 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, specifically comprising the following steps:

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

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

[0058] Plasma etching was used to simulate the destructive effect on the surface of carnauba wax, and then the self-healing property of its surface hydrophobicity was 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, respectively, and placed in the etching chamber of a plasma etcher, and after vacuuming, treated in a power environment of 100 W for 3 minutes, and then taken out for water contact angle test. The etched tinplate was placed 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] It can be seen from Table 1 that after plasma etching, the water contact angle on 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, compared with the carnauba wax prepared in Comparative Example 2, the carnauba wax prepared in Examples 1 to 4 of the present invention can be better restored to a hydrophobic state 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 a 10 cm×10 cm steel plate, respectively, and a surface resistance test was performed. The test results are shown in Table 2.

[0064] Table 2. Antistatic effect

[0065]

[0066]

[0067] It can be seen from Table 2 that 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 an obvious 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 coated on tinplate, respectively, 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 the standard of GB / T 9286-1998. The test results are shown in Table 3.

[0070] Table 3. UV resistance test results

[0071]

[0072] It can be seen from Table 3 that 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, which means that the anti-ultraviolet performance of the carnauba wax prepared in the present invention can be further improved under the synergistic combination of the modified carnauba wax, self-healing hydrophobic capsules and ultraviolet absorber of the present invention, which fully reflects the mutual synergistic effect of the components in the carnauba wax.

[0073] 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 carnauba wax for automobiles, characterized in that: The preparation method comprises the following steps: 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 and mixed 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, and the mixed solution 3 is ultrasonically defoamed to obtain the carnauba wax.

2. A method for preparing carnauba wax for automobiles as claimed in claim 1, characterized in that: The preparation method of the modified carnauba wax comprises the following steps: 10 parts by weight of natural carnauba wax were dissolved in 100 parts by weight of ethanol, and then a sodium hydroxide solution was added, 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.

3. The method for preparing carnauba wax for automobiles according to claim 1, characterized in that: The preparation method of the self-repairing hydrophobic microcapsules comprises the following steps: 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, and the mixture is mixed and stirred, and then 2 parts by weight of dibenzoyl peroxide are added, and the mixture is stirred at 70°C for 24 hours to obtain polyethylene grafted with carboxylic acid groups, and then 50 parts by weight of hexadecyl acrylate and 2 parts by weight of dibenzoyl peroxide are added, and the modified polyethylene is obtained by mixing and reacting; 10 parts by weight of the modified polyethylene is weighed and added to 500 parts by weight of xylene, and the mixture is heated to 70°C to dissolve, and 50 parts by weight of ammonium persulfate solution and 10 parts by weight of the aniline solution are added, and the mixture is stirred at 60°C for 6 hours to obtain self-repairing hydrophobic microcapsules.

4. A method for preparing carnauba wax for automobiles as claimed in claim 1, characterized in that: The antistatic agent includes hexadecyltrimethylammonium bromide, octadecyltrimethylammonium chloride or hexadecyltrimethylammonium chloride.

5. The method for preparing carnauba wax for automobiles according to claim 1, characterized in that: The ultraviolet absorber is UV-329.

6. The method for preparing carnauba wax for automobiles according to claim 1, characterized in that: The emulsifier is Tween60.

7. The method for preparing carnauba wax for automobiles according to claim 1, characterized in that: The emulsification time is 1 to 2 hours.

8. The method for preparing carnauba wax for automobiles according to claim 1, characterized in that: 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.

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

35.

10. 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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