Preparation method of water-soluble crayon easy to wash and capable of not dirtying hands

Abstract

A preparation method of a water-soluble crayon easy to wash and capable of not dirtying hands is characterized by comprising the following steps: (1) preparing stearic acid modified synthetic wax: selecting raw materials and putting the raw materials into a reaction kettle for reaction to obtain stearic acid modified / synthetic wax; the raw materials comprise the following components in percentage by weight: 45-60% of wax, 15-35% of stearic acid, 10-20% of an emulsifier, 5-10% of stearate, 2-5% of an auxiliary agent and 1-5% of a viscosity regulator; (2) preparing the water-soluble crayon without staining hands after water washing: putting the crayon raw materials into a reaction kettle, and stirring at the temperature of 120-135 DEG C until the crayon raw materials are uniformly stirred; pouring the uniformly mixed mixture into a forming machine; and cooling and demolding to obtain the water-soluble crayon which is easy to wash and does not dirty hands. The obtained crayon is easy to wash, does not dirty hands, and has the advantages of heat resistance and good coloring effect.

Description

Technical Field

[0001] The invention relates to a method for preparing a painting brush, in particular to a method for preparing a crayon. Background Art

[0002] Most of the water-soluble crayons on the market currently have the following problems: they can easily stain hands during use, causing discomfort to users, especially children; they are difficult to clean, requiring the use of special detergents or spending a lot of time and effort to clean; they are not silky enough when painting, affecting the painting experience, and it is difficult to apply uniformly in a fixed image or area; they are not heat-resistant, and some crayons will melt or partially ooze oil in containers or under direct sunlight, contaminating the roll of paper or losing their performance.

[0003] Several improved water-based crayons are disclosed in the prior art, see the Chinese invention patent "Washable Graffiti Crayons and Preparation Methods Thereof" (authorization announcement number CN 109517449B) with patent number ZL201811571102.3. This patent first mixes and melts some of the raw materials and then adds environmentally friendly pigments to obtain pigment pretreatments, then prepares aqueous wax liquid, and then adds pigment pretreatments and other ingredients to the aqueous wax liquid, and obtains a liquid slurry after heating and stirring, and finally obtains crayons through a molding process. The water-based crayons obtained by this patent emphasize environmental protection, non-toxicity, antibacterial safety, and fresh smell. After painting on paper, using a brush to dip in water to smudge can produce an artistic effect similar to watercolor. It has strong graffiti ability on multiple interfaces, and can be painted and colored on surfaces such as paper, skin, cloth, plastic, glass, marble and metal, and has good water washability and can be easily removed with clean water. However, there is no outstanding performance in the heat resistance and coloring effect of crayons.

[0004] Referring to the Chinese invention patent application with application number 201910366416.8, entitled "APEO-free erasable crayons and methods for making the same" (application publication number CN 110003722A), the application first adds paraffin, hydrogenated oil, stearic acid and other substances to the wax melting pot and heats them to melt, then adds fatty alcohol polyoxyethylene ether and polyethylene glycol, and then adds pigment toner and titanium dioxide. The application emphasizes achieving the environmental protection goal of "APEO-free" while maintaining product performance unchanged and cost at the original level. It also does not explain the heat resistance and coloring effect of the crayons.

[0005] Referring to the Chinese invention patent "Bathroom Crayons and Preparation Methods thereof" with patent number ZL202111678128.X (authorization announcement number CN114149712B), the patent first mixes polyolefin wax, self-emulsifying monoglyceride, cocamide MEA, laureth-25, and grease, heats to 95-100°C, and dissolves to form a first mixture; then mixes the first mixture with the crayon filler to obtain a second mixture; when the second mixture is cooled to 75-85°C, color materials are added and mixed to obtain a third mixture; finally, the third mixture is mixed with an additive. The crayons obtained by this patent are easy to color, easy to clean, and not easily dissolved in water. They are suitable for the special environment of the bathroom, solving the problem of using oil-based crayons and water-based crayons in the bathroom, meeting the needs of parents and children to draw in the bathroom, and increasing the fun of children bathing and showering. However, there is no description of heat resistance. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a method for preparing water-soluble crayons which are heat-resistant and have good coloring effect and are easy to wash without dirtying hands, in view of the above technical status quo.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: a method for preparing water-soluble crayons that are easy to wash and do not dirty hands, characterized by comprising the following steps:

[0008] ① Preparation of stearic acid modified synthetic wax: select raw materials and put them into a reactor, react at a temperature of 120°C to 200°C until the mixture is stirred evenly; after cooling to room temperature, stearic acid modified / synthetic wax is obtained; the aforementioned raw materials include the following components and their weight ratios: 45-60% wax, 15-35% stearic acid, 10-20% emulsifier, 5-10% stearate, 2-5% additive, and 1-5% viscosity adjuster;

[0009] ② Preparation of water-soluble crayons that are easy to wash without getting dirty. Put the crayon raw materials into a reactor and stir them at a temperature of 120°C to 135°C until they are evenly stirred; pour the evenly mixed mixture into a molding machine; after cooling and demolding, water-soluble crayons that are easy to wash without getting dirty are obtained; the aforementioned crayon raw materials include the following components and their weight ratios: 75% to 90% of stearic acid modified synthetic wax, 6% to 10% of filler, 2% to 5% of vegetable oil, and 2% toner.

[0010] Preferably, the wax is at least one of semi-refined paraffin wax, soybean wax, fully refined paraffin wax, Fischer-Tropsch wax, beeswax and microcrystalline wax.

[0011] Preferably, the stearic acid is at least one of stearic acid SA1801, stearic acid 1865 and polyhydroxystearic acid. Stearic acid SA1801 / stearic acid 1865 can be used as the main stearic acid component of this system. Polyhydroxystearic acid has the following advantages: 1. It can significantly reduce the viscosity of the dispersion system, thereby increasing the pigment concentration, facilitating the provision of a wider range of viscosity adjusters, and facilitating better demoulding of later products, with a smoother surface; 2. It has excellent anti-pigment agglomeration effect. It has good dispersion stability, which helps to evenly disperse the powders and toners that may be added later; 3. It does not contain epoxy groups, and the raw materials are plant-derived, with good safety and low skin irritation. 4. It has good compatibility with oils and esters. Mechanism of action of polyhydroxystearic acid: This dispersant adheres to the surface of the powder particles, thereby preventing the dispersed powders from combining with each other through the three-dimensional structure and electrostatic repulsion, making the particle size more uniform and delicate. Adding polyhydroxystearic acid can greatly increase the amount of hydrophilic powder or hydrophilic substance added, and the system still has excellent fluidity. A relatively small dosage can significantly reduce the viscosity of the dispersion system, thereby increasing the concentration of powder added, improving the stability of the dispersion system, and having an excellent effect in preventing color powder from agglomerating.

[0012] Stearates exhibit significant characteristics of improving thermal stability, can effectively increase the melting point, and have excellent antioxidant properties.

[0013] Preferably, the emulsifier is at least one of pingpingjia, FMEE, caprylic capric triglyceride, and tridecyl trimellitate. Pingpingjia / FMEE can improve water solubility and easy water washing. Pingpingjia also has good wetting properties, and has good emulsification, dispersion, cleaning and other properties. Caprylic capric triglyceride is a high-purity oil esterified by caprylic acid / capric acid and glycerol. It is an excellent moisturizing oil with good spreadability, which can make the product have a smooth and non-greasy feeling and moderate moisturizing property, and plays a good role in the uniformity and fineness of the product. The odor is very low and provides a certain gloss to the product. The effects and functions of tridecyl trimellitate mainly include: emollient, dispersant, increase emulsion viscosity, improve skin feel, etc. Tridecyl trimellitate is a performance improver, which can be used as an emulsifier to effectively mix oily components and aqueous components together, and enhance and improve the affinity of the system to aqueous substances. In addition, it can also be used as a thickener to enhance texture and increase its viscosity and consistency. Fatty acid methyl ester ethoxylate (FMEE) is a typical nonionic surfactant, which is prepared by direct addition of fatty acid methyl ester with ethylene oxide (EO) under the action of corresponding catalyst. Compared with traditional fatty alcohol ethoxylate (AEO), it has low foaming and high cloud point, fast cold water solubility, good oil and wax removal effect, and still has good fluidity in winter. Adding it to the formula system can effectively improve the washability. In addition, the good low-temperature fluidity also facilitates production and feeding when the temperature is low in winter.

[0014] Preferably, the stearate is at least one of zinc stearate, magnesium stearate, aluminum stearate and calcium stearate.

[0015] Preferably, the auxiliary agent is at least one of caprylic capric triglyceride and tridecanol trimellitate.

[0016] Preferably, the viscosity modifier is at least one of aluminum hydroxide and magnesium hydroxide, which mainly adjusts the viscosity of the system and improves the problem of poor thermal stability after molding, reducing oil seepage and non-slip feeling.

[0017] Preferably, the vegetable oil is at least one of palm oil, coconut oil and epoxidized soybean oil.

[0018] Preferably, the filler is at least one of calcium carbonate, barium sulfate, calcium sulfate, kaolin, talc, titanium dioxide, mica powder, magnesium silicate, zinc oxide, magnesium carbonate and white carbon black.

[0019] Preferably, the filler has an average particle size of 5 to 10 μm and a whiteness of at least 95%.

[0020] Preferably, the color powder is at least one of permanent red F4R, permanent orange, fast yellow G, phthalocyanine green G, fast rose color source, phthalocyanine blue BGS, permanent purple RL, black and titanium dioxide R923.

[0021] Preferably, the toner has a heat resistance higher than 120°C.

[0022] The reaction time in the reactor is 7 to 10 hours.

[0023] Preferably, the solidification time of the uniformly mixed raw materials is 1 to 3 hours.

[0024] Compared with the prior art, the advantages of the present invention are: enhanced hydrophilicity and easy water washing: the hydrophilicity of the water-soluble crayons is significantly improved, which is easy to wash and clean, and also provides more possibilities for creating unique painting effects.

[0025] No dirty hands: When using, even if the user's hands directly touch the water-soluble crayons, no stains will be left, making the use process more hygienic and convenient. The main reasons for dirty hands are the following: the stick body is not resistant to high temperatures, and grease will precipitate when the temperature is high; the proportion of solid oil substances in the formula is not coordinated, and grease will precipitate; the present invention effectively improves the melting point of water-soluble crayons, ensuring that they can still maintain a stable shape at higher temperatures and are not easy to soften or deform. For example, magnesium stearate mainly improves the overall melting point, and magnesium hydroxide can effectively adsorb and fix grease. Even if an oven heating test is performed, grease is not easy to precipitate. The coordinated effect of the two substances improves the heat resistance of the product.

[0026] Optimized painting experience: The smoothness of water-soluble crayons on paper has been improved, making the painting process smoother and smoother, thereby improving the quality of paintings and the efficiency of creation. For example, the reasonable ratio of polyhydroxystearic acid, caprylic capric triglyceride and stearate can achieve a smooth painting effect.

[0027] The addition of emulsifiers and additives improves fluidity, allowing the material to flow better into the molding machine during production, making the surface of the water-soluble crayons smoother and neater, and easier to demold, thus improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a picture of the state of traditional water-soluble crayons after being placed in a 60℃ oven for 3 hours.

[0029] Figure 2 This is a state diagram of the water-soluble crayon of Example 1 after being placed in a 60°C oven for 3 hours.

[0030] Figure 3 This is a photograph of traditional water-soluble crayons before washing.

[0031] Figure 4 This is a photo of traditional water-soluble crayons after washing.

[0032] Figure 5 This is a photograph of the crayon of Example 2 before washing.

[0033] Figure 6 This is a photograph of the crayon of Example 2 after cleaning.

[0034] Figure 7 Test photo illustration for traditional crayons without getting your hands dirty.

[0035] Figure 8 This is a photograph of the crayon of Example 3 being tested in a no-dirty hand test.

[0036] Fig. 9 This is a photo of the traditional crayon painting effect.

[0037] Fig.10 It is a photo of the painting effect of the crayon of Example 4.

[0038] Fig.11 Photographs of the production process of the water-soluble crayons prepared in Example 5 Figure 1 .

[0039] Fig.12 Photographs of the production process of the water-soluble crayons prepared in Example 5 Figure 2 .

[0040] Fig.13 Photographs of the production process of the water-soluble crayons prepared in Example 5 Figure 3 . DETAILED DESCRIPTION

[0041] The present invention is further described in detail below with reference to the accompanying drawings.

[0042] Example 1

[0043] (1) Select raw materials of beeswax 49%, SA1801 stearate 18%, peregal 20%, magnesium stearate 8%, magnesium hydroxide 3%, and tridecyl trimellitate 2% in a formula ratio, put them into a reactor, and react at a temperature of 200° C. until the stirring time is 7 to 10 hours;

[0044] (2) after cooling to room temperature, stearic acid modified / synthetic wax is obtained;

[0045] (3) According to the mass percentage, it includes: stearic acid modified / synthetic wax: 85.5%; calcium carbonate: 7%; epoxidized soybean oil: 2%, 5% titanium dioxide 902+ and 0.5% phthalocyanine blue BGS; the sum of the amounts of the above components is 100%, and the water-soluble crayon that is easy to wash and does not dirty hands is manufactured by the following process;

[0046] (4) Place the weighed raw materials into the reactor and stir at 120°C until the mixture is uniform for 3 hours.

[0047] (5) pouring the uniformly mixed raw materials into a molding machine;

[0048] (6) After cooling and demoulding, you will get a water-soluble crayon that is easy to wash and does not dirty your hands.

[0049] Combination Figure 1 and Figure 2 As shown, from the comparison pictures of the test results above, it can be seen that compared with the traditional water-soluble crayons, it can be clearly observed that the traditional water-soluble crayons have begun to melt and deform, while the crayons prepared in Example 1 remain in an unmelted state.

[0050] Example 2

[0051] (1) Select raw materials of the formula ratio of 52% beeswax, 14% stearic acid 1865 and 6% polyhydroxystearic acid, 16% peregal, 7% magnesium stearate, 3% magnesium hydroxide, and 2% tridecyl trimellitate, put them into a reaction kettle, and react at a temperature of 200° C. until the stirring time is 7 to 10 hours;

[0052] (2) after cooling to room temperature, stearic acid modified / synthetic wax is obtained;

[0053] (3) According to the mass percentage, it includes: stearic acid modification / synthesis: 85.5%; talc: 7%; epoxidized soybean oil: 2%, 5% titanium dioxide 902+ and 0.5% phthalocyanine blue BGS; the sum of the amounts of the above components is 100%, and the water-soluble crayon that is easy to wash and does not dirty hands is manufactured by the following process;

[0054] (4) Place the weighed raw materials into the reactor and stir at 120°C until the mixture is uniform for 3 hours.

[0055] (5) pouring the uniformly mixed raw materials into a molding machine;

[0056] (6) After cooling and demoulding, you will get a water-soluble crayon that is easy to wash and does not dirty your hands.

[0057] Combination Figure 3 to Figure 6 As shown, four vertical lines were painted on the six-line cloth with equal force. After drawing, they were washed with water and gently rubbed by hand for 5 minutes. It was observed that the traditional crayons could not be washed clean and there were obvious traces (marked with red circles in the figure), while the water-soluble crayons prepared in Example 2 could be washed clean.

[0058] Example 3

[0059] (1) Select raw materials of beeswax 50%, stearic acid 1865 19%, peregal 15%, aluminum stearate 10%, magnesium hydroxide 3%, and tridecyl trimellitate 3% in a formula ratio, put them into a reaction kettle, and react at a temperature of 200° C. until the stirring time is 7 to 10 hours;

[0060] (2) after cooling to room temperature, stearic acid modified / synthetic wax is obtained;

[0061] (3) According to the mass percentage, it includes: stearic acid modified / synthetic wax: 85.5%; barium sulfate: 7%; palm oil: 2%, 5% titanium dioxide 902+ and 0.5% permanent red F4R; the sum of the amounts of the above components is 100%, and the water-soluble crayon that is easy to wash and does not dirty hands is manufactured by the following process;

[0062] (4) Place the weighed raw materials into the reactor and stir at 120°C until the mixture is uniform for 3 hours.

[0063] (5) pouring the uniformly mixed raw materials into a molding machine;

[0064] (6) After cooling and demoulding, you will get a water-soluble crayon that is easy to wash and does not dirty your hands.

[0065] Combination Figure 7 and Figure 8As shown in the figure, the test conditions are to wrap the crayons with white paper, hold the crayons for the same time, and perform normal writing and drawing operations. The observation results show that the traditional water-soluble crayons have obvious fading problems (marked with red circles in the figure). In contrast, the water-soluble crayons prepared in Example 3 did not fade, showing good color stability and cleanliness in use.

[0066] Example 4

[0067] (1) Select raw materials of a formula ratio of 51.5% beeswax, 17% stearic acid 1865, 3% polyhydroxystearic acid, 12% peregal, 3.5% tridecyl trimellitate, 10% aluminum stearate, and 3% magnesium hydroxide, put them into a reaction kettle, and react at a temperature of 200° C. until the stirring time is 7 to 10 hours;

[0068] (2) after cooling to room temperature, stearic acid modified / synthetic wax is obtained;

[0069] (3) According to the mass percentage, it includes: stearic acid modified / synthetic wax: 85.5%; barium sulfate: 7%; palm oil: 2%, 5% titanium dioxide 902+ and 0.5% permanent red F4R; the sum of the amounts of the above components is 100%, and the water-soluble crayon that is easy to wash and does not dirty hands is manufactured by the following process;

[0070] (4) Place the weighed raw materials into the reactor and stir at 120°C until the mixture is uniform for 3 hours.

[0071] (5) pouring the uniformly mixed raw materials into a molding machine;

[0072] (6) After cooling and demoulding, you will get a water-soluble crayon that is easy to wash and does not dirty your hands.

[0073] Combination Fig. 9 and Fig.10 As shown, on A4 paper, when the flat drawing method is used to draw a square pattern, it can be clearly observed that: the pattern drawn by the traditional water-soluble crayon has obvious unevenness, the coloring effect is not satisfactory, and a large amount of debris will fall off; the pattern drawn by the water-soluble crayon prepared in Example 4 appears to be very uniform, the brush strokes are silky and smooth, the coloring effect is significantly improved, and there is no debris falling off.

[0074] Example 5

[0075] (1) Select raw materials of the formula ratio of beeswax 51.8%, stearic acid 1865 10%, polyhydroxystearic acid 10%, peregal 12%, tridecyl trimellitate 3.2%, aluminum stearate 10%, magnesium hydroxide 3%, put them into a reactor, react at 200°C until the stirring time is 7 to 10 hours;

[0076] (2) after cooling to room temperature, stearic acid modified / synthetic wax is obtained;

[0077] (3) According to the mass percentage, it includes: stearic acid modified / synthetic wax: 88%; calcium carbonate: 7%; palm oil: 2%, phthalocyanine green G: 2% and fast yellow G: 1%; the sum of the amounts of the above components is 100%, and the water-soluble crayon that is easy to wash and does not dirty hands is manufactured by the following process;

[0078] (4) Place the weighed raw materials into the reactor and stir at 120°C until the mixture is uniform for 3 hours.

[0079] (5) pouring the uniformly mixed raw materials into a molding machine;

[0080] (6) After cooling and demoulding, you will get a water-soluble crayon that is easy to wash and does not dirty your hands.

[0081] Combination Fig.11 , Fig.12 and Fig.13 , it can be seen that the crayon making process has excellent fluidity, which enables it to flow into the molding machine more smoothly during the production process, thus ensuring that the surface of the water-soluble crayons is smoother and neater, and also significantly improves the demoulding effect.

[0082] It should be clear that the described embodiments only constitute a part of the embodiments of the present invention, but not all of them. Based on the embodiments provided in the present invention, any other embodiments obtained by ordinary technicians in this field without involving creative work should be deemed to fall within the scope of protection of the present invention.

Claims

1. A method for preparing water-soluble crayons that are easy to wash and do not dirty your hands, characterized in that The steps include: ① Preparation of stearic acid modified synthetic wax: select raw materials and put them into a reactor, react at a temperature of 120°C to 200°C until the mixture is stirred evenly; after cooling to room temperature, stearic acid modified / synthetic wax is obtained; the aforementioned raw materials include the following components and their weight ratios: 45-60% wax, 15-35% stearic acid, 10-20% emulsifier, 5-10% stearate, 2-5% additive, and 1-5% viscosity adjuster; ② Preparation of water-soluble crayons that are easy to wash without getting dirty. Put the crayon raw materials into a reactor and stir them at a temperature of 120°C to 135°C until they are evenly stirred; pour the evenly mixed mixture into a molding machine; after cooling and demolding, water-soluble crayons that are easy to wash without getting dirty are obtained; the aforementioned crayon raw materials include the following components and their weight ratios: 75% to 90% of stearic acid modified synthetic wax, 6% to 10% of filler, 2% to 5% of vegetable oil, and 2% toner.

2. The preparation method according to claim 1, characterized in that The wax is at least one of semi-refined paraffin wax, soybean wax, fully refined paraffin wax, Fischer-Tropsch wax, beeswax and microcrystalline wax.

3. The preparation method according to claim 1, characterized in that The stearic acid is at least one of stearic acid SA1801, stearic acid 1865 and polyhydroxystearic acid.

4. The preparation method according to claim 1, characterized in that The emulsifier is at least one of peregal, FMEE, caprylic capric triglyceride and tridecyl trimellitate.

5. The preparation method according to claim 1, characterized in that The stearate is at least one of zinc stearate, magnesium stearate, aluminum stearate and calcium stearate.

6. The preparation method according to claim 1, characterized in that The auxiliary agent is at least one of caprylic capric triglyceride and tridecanol trimellitate.

7. The preparation method according to claim 1, characterized in that The viscosity adjuster is at least one of aluminum hydroxide and magnesium hydroxide.

8. The preparation method according to claim 1, characterized in that The vegetable oil is at least one of palm oil, coconut oil and epoxidized soybean oil.

9. The preparation method according to claim 1, characterized in that The filler is at least one of calcium carbonate, barium sulfate, calcium sulfate, kaolin, talc, titanium dioxide, mica powder, magnesium silicate, zinc oxide, magnesium carbonate and white carbon black; the average particle size of the filler is 5-10 μm, and the whiteness is at least 95%.

10. The preparation method according to claim 1, characterized in that The toner is at least one of permanent red F4R, permanent orange, fast yellow G, phthalocyanine green G, fast rose color source, phthalocyanine blue BGS, permanent purple RL, black and titanium dioxide R923; the toner is a toner with heat resistance higher than 120°C.

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