Easily washable oil painting stick and preparation method thereof
By using the dual-structure entanglement formed by bio-based oils and higher fatty acid salts, and the enhancement of hydrogen bonding by amphiphilic additives, the problems of oil seepage and deformation and difficulty in cleaning of oil pastels at high temperatures have been solved, achieving stability and easy cleaning.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-16
- Publication Date
- 2026-04-07
AI Technical Summary
Existing oil pastels are prone to bleeding and deformation at high temperatures and are difficult to clean, especially leaving stubborn stains on clothes.
The oil pastels are made by using bio-based oils to form entangled lipophilic segments with higher fatty acids and higher fatty acid salts, and by enhancing hydrogen bonding with amphiphilic additives. Combined with a special preparation method, this ensures that the oil pastels are stable at high temperatures and easy to clean.
Oil pastels are not prone to bleeding or deformation at high temperatures, and they can be quickly cleaned with water, maintaining the texture of the painting.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of children's oil pastel technology, specifically to an easy-to-wash oil pastel and its preparation method. Background Technology
[0002] Oil pastels are oil-based coloring tools, usually cylindrical or prismatic sticks. They are designed to simulate the effect of oil painting, and are portable and easy to use, making them a suitable drawing tool for children and beginners.
[0003] For many years, oil pastels have played an important role in children's art as a writing tool, leading to increasing sales in convenience stores and stationery stores. However, oil pastels are mainly composed of various waxes, petroleum jelly, white oil, vegetable oil, and other oily substances, along with highly adhesive fillers. While white oil and petroleum jelly provide a smooth and oily writing feel, their properties differ significantly from other materials in the composition. Traditional oil pastels are prone to bleeding and even deformation when heated due to poor compatibility, severely affecting product quality. Furthermore, oil pastels, primarily composed of various waxes, vegetable oils, and other oily substances, along with highly adhesive fillers (talcum powder, calcium carbonate) and pigments, are difficult to clean off clothing, a persistent pain point for this product.
[0004] Therefore, there is a need for further improvements to the current children's oil pastels. Summary of the Invention
[0005] The first technical problem to be solved by the present invention is to provide an easy-to-wash oil pastel that is not easily stained or deformed at high temperatures and is easy to clean, in light of the current state of the prior art.
[0006] The second technical problem to be solved by the present invention is to provide a method for preparing the above-mentioned washable oil pastel, in view of the current state of the prior art.
[0007] The technical solution adopted by the present invention to solve at least one of the above-mentioned technical problems is as follows: An easy-to-wash oil pastel, comprising the following components by weight:
[0008] The oil is a bio-based oil, and the additive is an amphiphilic additive.
[0009] Preferably, the bio-based oil forms a dual structure with lipophilic segment entanglement and strong hydrogen bonding between the oil and higher fatty acids and higher fatty acid salts.
[0010] Preferably, the bio-based oil has a first lipophilic segment, and the higher fatty acids and higher fatty acid salts have a second lipophilic segment. The first and second lipophilic segments are connected in the same polarity, so that the bio-based oil and the higher fatty acids and higher fatty acid salts form a lipophilic segment entanglement structure.
[0011] Preferably, the bio-based oil has at least one of a strong hydrogen-bonding group, namely an ester group, a hydroxyl group, a carbonyl group, or a carboxyl group; the higher fatty acid has a carboxyl group; the higher fatty acid salt has an ionized carbonyl group; and the strong hydrogen-bonding group of the bio-based oil forms a strong hydrogen bond structure with the carboxyl group of the higher fatty acid and the ionized carbonyl group of the higher fatty acid salt.
[0012] Further preferably, the amphiphilic auxiliary has a strongly polar group that can enhance the strength of the hydrogen bond structure through hydration.
[0013] Preferably, the bio-based oil is a blend of oils, selected from at least two of the following: laurel oil, 10-degree palm oil, 24-degree palm oil, 52-degree palm oil, soybean oil, peanut oil, castor oil, refined tallow, refined lard, and refined mutton tallow.
[0014] Preferably, the higher fatty acid is at least one selected from lauric acid, tridecanoic acid, myristic acid, palmitic acid, pearlitic acid, oleic acid, stearic acid, and eicosanoic acid; The higher fatty acid salt is at least one of sodium laurylate, magnesium laurylate, sodium palmitate, magnesium palmitate, zinc palmitate, sodium oleate, sodium stearate, magnesium stearate, zinc stearate, and calcium stearate.
[0015] Preferably, the additive is at least one of the following: transparent soap base, milky white soap base, fatty alcohol polyoxyethylene ether (AEO-8, AEO-9, AEO-10), glyceryl monostearate, glyceryl distearate, polyethylene glycol (PEG-1000, PEG-1500, PEG-2000), sparganum (O-20, O-25, O-30), Span-80, Tween-80, sodium dodecyl sulfate, OP-10, sodium octylbenzenesulfonate, and SX-2166.
[0016] Preferably, the filler is at least one of talc, kaolin, calcium carbonate powder, titanium dioxide, alumina powder, and zirconium oxide powder; The wax material is at least one of natural beeswax, artificial beeswax, rice bran wax, and soybean wax.
[0017] A method for preparing washable oil pastels: According to the above-mentioned formula for washable oil pastels, high fatty acids, high fatty acid salts and wax are added to a glass beaker, heated and melted at 95°C, and after complete melting, oil is added and thoroughly stirred and mixed. Then, additives are added and thoroughly stirred and mixed at 90°C. Finally, a premix of filler and pigment is added to obtain a mixture of washable oil pastels that does not leak oil at high temperatures and is not easily deformed. After thoroughly mixing the above mixture, let it stand to remove bubbles. Pour the defoamed mixture into a mold, place the mold in an environment of -20°C for rapid cooling, remove it and allow it to return to room temperature, then demold to obtain the washable oil pastel.
[0018] Compared with existing technologies, the advantages of this invention are as follows: This invention eliminates components such as white oil and petrolatum commonly used in traditional oil pastel formulations, replacing them with a mixture of various bio-based oils with higher compatibility, and supplemented with special structural additives. The structural bonding between components is changed from the simple entanglement of long nonpolar chains of traditional mineral oils and lipophilic chains of fatty acids and fatty acid salts to an entanglement structure of amphiphilic chains. At the same time, strong hydrogen bonds are formed between the strong hydrogen bond groups on the bio-based oils and the carboxyl groups of fatty acids and the ionized carbonyl groups of fatty acid salts. The hydration effect of the strong polar groups of the highly amphiphilic additives further enhances the hydrogen bond strength, so that the oils in the oil pastels can exist stably at high temperatures. While maintaining the painting texture of traditional oil pastels, it is not prone to problems such as high-temperature bleeding and deformation. In addition, the highly amphiphilic additives also provide sufficient hydrophilicity, making the oil pastels easy to wash with water when they react with water. Detailed Implementation
[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described in detail below. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. Example The method for preparing washable oil pastels in this embodiment is as follows:
[0020] Weigh out 24.5 parts stearic acid, 7 parts magnesium stearate, and 8.5 parts beeswax. Place them in a heating pot and heat to 95°C to melt them. Stir thoroughly, then add 5 parts butter and stir thoroughly until well mixed. Add 14 parts of Pingpingjia O-25, 4 parts of glyceryl monostearate, and 2 parts of soybean lecithin to the mixture and stir thoroughly at 90°C. Add 35 parts of a mixed powder of calcium carbonate and pigment. The specific amounts of calcium carbonate and organic pigment in the mixed powder are determined by the desired final color of the oil pastel. In this example, the desired color is red, which includes 6 parts of Pigment Red 254# pigment and 29 parts of calcium carbonate.
[0021] After stirring thoroughly and allowing the mixture to stand to remove bubbles, pour it into a mold and rapidly cool it at -20°C. Once cooled to room temperature, remove it from the mold to obtain the corresponding oil pastel. Example
[0022] The method for preparing the washable oil pastel in this embodiment is as follows: Weigh out 25 parts lauric acid, 6 parts zinc stearate, 5 parts beeswax, and 2 parts rice bran wax. Place them in a heating tank and heat to 95°C to melt. Stir thoroughly. Then add 5 parts tallow, 2 parts 10°C palm oil, and 12 parts 53°C palm oil, and stir thoroughly until well mixed. Add 3 parts soybean oil lecithin to the mixture and stir thoroughly at 90°C. Add 40 parts of a mixed powder of calcium carbonate and pigment. The specific amounts of calcium carbonate and organic pigment in the mixed powder are determined by the desired final color of the oil pastel. In this example, the desired color is red, which includes 6 parts Pigment Red 254# pigment and 29 parts calcium carbonate.
[0023] After stirring thoroughly and allowing the mixture to stand to remove bubbles, pour it into a mold and rapidly cool it at -20°C. Once cooled to room temperature, remove it from the mold to obtain the corresponding oil pastel. Example
[0024] The preparation method of the oil pastels in this embodiment is as follows: Weigh out 11.7 parts stearic acid, 3.3 parts magnesium stearate, and 5 parts beeswax. Place them in a heating tank and heat to 95°C to melt. Stir thoroughly. Then add 10 parts tallow, 10 parts 53°C palm oil, and 3 parts 10°C palm oil, and stir thoroughly until well mixed. Add 3 parts of Pingpingjia O-25, 2 parts of SX-2166, and 6 parts of soybean oil lecithin to the mixture and stir thoroughly at 90°C. Add 46 parts of a mixture of calcium carbonate and pigment powder to the mixture. The specific amounts of calcium carbonate and pigment powder in the mixture are determined by the desired final color of the oil pastel. In this embodiment, the desired color is red, which includes 6 parts of Pigment Red 254# pigment powder and 29 parts of calcium carbonate.
[0025] After stirring thoroughly and allowing the mixture to stand to remove bubbles, pour it into a mold and rapidly cool it at -20°C. Once cooled to room temperature, remove it from the mold to obtain the corresponding oil pastel.
[0026] Below are some common oil pastel recipes available on the market as comparison examples. It should be noted that the following comparison examples are only basic recipes for comparison purposes.
[0027] Comparative Example 1: The difference between this comparative example and Example 1 is that non-biobased oil white oil and petrolatum were used in the system, while the other components remained the same as in Example 1.
[0028] Weigh out 24.5 parts stearic acid, 7 parts magnesium stearate, and 8.5 parts beeswax. Place them in a heating pot and heat to 95°C to melt them. Stir thoroughly, then add 5 parts white oil and stir thoroughly until well mixed. Add 14 parts of leveling agent O-25, 4 parts of glyceryl monostearate, and 2 parts of petrolatum to the mixture and stir thoroughly at 90°C. Add 35 parts of a mixture of calcium carbonate and pigment powder to the mixture. The specific amounts of calcium carbonate and organic pigment powder in the mixture are determined by the desired final color of the oil pastel. In this example, the color is red, which includes 6 parts of Pigment Red 254# pigment powder and 29 parts of calcium carbonate.
[0029] After stirring thoroughly and allowing the mixture to stand to remove bubbles, pour it into a mold and rapidly cool it at -20°C. Once cooled to room temperature, remove it from the mold to obtain the corresponding oil pastel.
[0030] Comparative Example 2: The difference between this comparative example and Example 1 is that no amphiphilic adjuvant was added in this comparative example, while the other components remained the same as in Example 1.
[0031] Weigh out 24.5 parts stearic acid, 7 parts magnesium stearate, and 8.5 parts beeswax. Place them in a heating container and heat to 95°C until melted. Stir thoroughly, then add 5 parts butter and stir thoroughly until well mixed. Add 2 parts soybean oil lecithin to the mixture and stir thoroughly at 90°C. Add 53 parts of a mixture of calcium carbonate and pigment powder to the mixture. The specific amounts of calcium carbonate and organic pigment powder in the mixture are determined by the desired final color of the oil pastel. In this example, the color is red, with 6 parts Pigment Red 254# pigment powder and 29 parts calcium carbonate added.
[0032] After stirring thoroughly and allowing the mixture to stand to remove bubbles, pour it into a mold and rapidly cool it at -20°C. Once cooled to room temperature, remove it from the mold to obtain the corresponding oil pastel.
[0033] Comparative Example 3: The difference between this comparative example and Example 1 is that no amphiphilic additives were added while using non-biobased oils; the other components remained the same as in Example 1.
[0034] Weigh out 24.5 parts stearic acid, 7 parts magnesium stearate, and 8.5 parts beeswax. Place them in a heating container and heat to 95°C until melted. Stir thoroughly, then add 5 parts white oil and stir thoroughly until well mixed. Add 2 parts petrolatum to the mixture and stir thoroughly at 90°C. Add 53 parts of a mixture of calcium carbonate and pigment powder to the mixture. The specific amounts of calcium carbonate and organic pigment powder in the mixture are determined by the desired final color of the oil pastel. In this example, the color is red, with 6 parts Pigment Red 254# pigment powder and 29 parts calcium carbonate added.
[0035] After stirring thoroughly and allowing the mixture to stand to remove bubbles, pour it into a mold and rapidly cool it at -20°C. Once cooled to room temperature, remove it from the mold to obtain the corresponding oil pastel.
[0036] After thoroughly mixing and allowing the mixture to stand to remove air bubbles, pour it into a mold and rapidly cool it at -20°C. Once cooled to room temperature, remove it from the mold to obtain the desired oil pastel.
[0037] The test results of the oil pastels in each embodiment and comparative example are shown in Table 1 below: Table 1 shows the results of the washability test for oil pastels:
[0038] Test results: Compared with Example 1, Comparative Examples 1 and 3 did not use high-affinity bio-based oils in the system, but instead used non-bio-based oils. Therefore, at high temperatures, the non-bio-based oils with poor affinity seeped out from the rod, causing severe deformation. In Comparative Example 2, since there were no non-bio-based oils such as white oil and petrolatum, the overall affinity was better, so there was no oil seepage or deformation at high temperatures.
[0039] Washability Test: Draw uniform stitches along the fiber dividing lines on the SDC multifiber fabric, including at least 48 different colors of stitches. After drawing the stitches, let the SDC multifiber fabric stand for 1 hour, then immerse it in 45°C detergent water (1.5kg water + 50g Tide detergent) for 15 minutes. Next, rub the fabric with the detergent water for 5 minutes, rinse with clean water for 1 minute, and air dry. Observe whether there are any stitches remaining on the SDC multifiber fabric. The ratio of the number of residual stitches to the initial number of stitches is defined as the stitch residue rate. According to the description, the lower the stitch residue rate, the better the cleaning effect.
[0040] The test results of the oil pastels in each embodiment and comparative example are shown in Table 2 below: Table 2 shows the results of the washability test for oil pastels:
[0041] Test results: Comparative Example 1, because it retained the amphiphilic adjuvant, was closer to Example 1 in terms of washability compared to Comparative Examples 2 and 3. Comparative Examples 2 and 3 did not contain any amphiphilic adjuvant, so they showed almost no washability.
[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0043] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.
Claims
1. A washable oil pastel, characterized in that: Based on weight components, it includes the following components ， The oil is a bio-based oil, and the additive is an amphiphilic additive.
2. The washable oil pastel according to claim 1, characterized in that: The bio-based oils form a dual structure with lipophilic segment entanglement and strong hydrogen bonding between themselves and higher fatty acids and higher fatty acid salts.
3. The washable oil pastel according to claim 2, characterized in that: The bio-based oil has a first lipophilic segment, and the higher fatty acids and higher fatty acid salts have a second lipophilic segment. The first and second lipophilic segments are connected in the same polarity, so that the bio-based oil and the higher fatty acids and higher fatty acid salts form a lipophilic segment entanglement structure.
4. The washable oil pastel according to claim 2, characterized in that: The bio-based oil has at least one of the following strong hydrogen-bonding groups: ester group, hydroxyl group, carbonyl group, and carboxyl group. The higher fatty acid has a carboxyl group, and the higher fatty acid salt has an ionized carbonyl group. The strong hydrogen-bonding group of the bio-based oil forms a strong hydrogen bond structure with the carboxyl group of the higher fatty acid and the ionized carbonyl group of the higher fatty acid salt.
5. The washable oil pastel according to claim 4, characterized in that: The amphiphilic auxiliaries have highly polar groups that can enhance the strength of hydrogen bond structures through hydration.
6. The washable oil pastel according to any one of claims 2 to 5, characterized in that: The bio-based oil is a blend of oils, selected from at least two of the following: laurel oil, 10-degree palm oil, 24-degree palm oil, 52-degree palm oil, soybean oil, peanut oil, castor oil, refined tallow, refined lard, and refined mutton tallow.
7. The washable oil pastel according to any one of claims 2 to 5, characterized in that: The higher fatty acids mentioned are at least one of lauric acid, tridecanoic acid, myristic acid, palmitic acid, pearlitic acid, oleic acid, stearic acid, and eicosanoic acid; The higher fatty acid salt is at least one of sodium laurylate, magnesium laurylate, sodium palmitate, magnesium palmitate, zinc palmitate, sodium oleate, sodium stearate, magnesium stearate, zinc stearate, and calcium stearate.
8. The washable oil pastel according to any one of claims 2 to 5, characterized in that: The additives are at least one of the following: transparent soap base, milky white soap base, fatty alcohol polyoxyethylene ether, glyceryl monostearate, glyceryl distearate, polyethylene glycol, Pingpingjia, Span-80, Tween-80, sodium dodecyl sulfate, OP-10, sodium octylbenzenesulfonate, and SX-2166.
9. The washable oil pastel according to any one of claims 1 to 5, characterized in that: The filler is at least one of talc, kaolin, calcium carbonate powder, titanium dioxide, alumina powder, and zirconium oxide powder; The wax material is at least one of natural beeswax, artificial beeswax, rice bran wax, and soybean wax.
10. A method for preparing an easy-to-wash oil pastel, characterized in that: According to the formula of any one of claims 1 to 9 for easy-to-wash oil pastels, higher fatty acids, higher fatty acid salts and wax are added to a glass beaker, heated and melted at 95°C, and after complete melting, oil is added and stirred and mixed thoroughly. Then, additives are added and stirred and mixed thoroughly at 90°C. Finally, a premix of filler and pigment is added to obtain a mixture of easy-to-wash oil pastels that does not seep oil at high temperatures and is not easily deformed. After thoroughly mixing the above mixture, let it stand to remove bubbles. Pour the defoamed mixture into a mold, place the mold in an environment of -20°C for rapid cooling, remove it and allow it to return to room temperature, then demold to obtain the washable oil pastel.