Environment-friendly mosquito-repelling eraser and preparation method thereof

Abstract

The invention discloses an environment-friendly mosquito-repellent eraser and a preparation method thereof, and belongs to the technical field of erasers, firstly, the environment-friendly mosquito-repellent eraser prepared by the invention is composed of the following raw materials in percentage by mass: 40-50% of calcium carbonate; 25%-28% of PVC paste resin; 18%-20% of a plasticizer; 5.5%-7.5% of a mosquito repellent; 0.5%-1.5% of stearic acid; 0.5%-1.5% of zinc stearate and 0.5%-1.5% of calcium stearate. According to the environment-friendly mosquito-repellent eraser, the self-made mosquito repellent is added into the eraser with calcium carbonate and PVC paste resin as main materials, and finally through detection, the prepared environment-friendly mosquito-repellent eraser has an excellent mosquito-repellent effect on the basis of ensuring an excellent erasing effect and mechanical properties.

Description

Technical Field

[0001] The invention belongs to the technical field of erasers, and in particular relates to an environmentally friendly mosquito-repellent eraser and a preparation method thereof. Background Art

[0002] In daily life and in learning and working environments, mosquito bites have always been a problem that bothers people. Traditional mosquito repellent methods mainly rely on chemical agents such as mosquito coils and mosquito repellent liquids, but these products have many limitations. The burning of mosquito coils will produce smoke and harmful gases, which not only pollutes indoor air, but also irritates the human respiratory tract; although mosquito repellent liquids are relatively convenient, the chemical ingredients they contain, such as DEET, may be allergic to some people, and large-scale use will also cause certain pressure on the environment.

[0003] Erasers are commonly used stationery for students and are in close contact with users in daily use scenarios. Classrooms, offices and other learning and working places are often places where mosquitoes are likely to appear. Currently, erasers on the market have relatively simple functions and only have the basic function of erasing handwriting, which cannot meet people's needs for mosquito repellent protection during use. Summary of the invention

[0004] The invention aims to provide an environmentally friendly mosquito repellent eraser and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions: An environmentally friendly mosquito repellent eraser is composed of the following raw materials in percentage by mass: Calcium carbonate 40% to 50%; PVC paste resin 25%~28%; Plasticizer 18%~20%; Mosquito repellent 5.5% to 7.5%; Stearic acid 0.5%~1.5%; Zinc stearate 0.5%~1.5%; Calcium stearate 0.5%~1.5%.

[0006] Furthermore, the plasticizer is prepared by mixing epoxy soybean oil, glycerin and citric acid ester plasticizer in a mass ratio of 2-4:1:5-7.

[0007] Furthermore, the citrate plasticizer is triethyl citrate or tributyl citrate.

[0008] Furthermore, the mosquito repellent is prepared by the following steps: At room temperature, citronella oil, hydroxyethyl methacrylate, trimethylolpropane triacrylate and azobisisobutyronitrile are mixed, and then magnetically stirred at a speed of 800 r / min for 4-5 minutes to obtain an oil phase, and then an emulsifier is added to deionized water with stirring to obtain a water phase, and the oil phase is added to the water phase, and high-speed shear emulsification is performed at 10000 r / min for 2 minutes, and then the system is heated to 78-80°C under nitrogen protection, and then stirred and polymerized at a speed of 300 r / min for 8-10 hours. After completion, a mosquito repellent is obtained.

[0009] Furthermore, the usage ratio of the citronella oil, hydroxyethyl methacrylate, trimethylolpropane triacrylate and azobisisobutyronitrile is 2.5-10g:3g:2g:0.1g.

[0010] Furthermore, the emulsifier is one of emulsifier EL-20, emulsifier EL-40 and emulsifier EL-80; and the amount of the emulsifier in the water phase is 5.5-7.0wt%.

[0011] Furthermore, the volume ratio of the oil phase to the water phase is 1:10.

[0012] Furthermore, the preparation method of the environmentally friendly mosquito repellent eraser comprises the following steps: Firstly, each raw material is weighed according to the above mass percentage, and then stearic acid, zinc stearate and calcium stearate are stirred and mixed for 10-20 minutes, and then placed in a high-speed ball mill for ball milling through 100 meshes to obtain a mixed powder, and then calcium carbonate, PVC paste resin, plasticizer, mosquito repellent and the mixture are placed in a stirring kettle and stirred at room temperature for 10-20 minutes, and then the temperature is raised to 50-60° C. and stirred at a constant temperature for 1-2 hours. After the stirring is completed, the raw materials are cooled to room temperature and then vacuum degassing is performed to obtain an eraser raw material, and then the eraser raw material is poured into a mold for hot pressing molding. After the hot pressing molding is completed, the raw materials are cooled to room temperature, and then the raw materials are cut and polished to a required size and shape after demolding to obtain a mosquito repellent eraser.

[0013] Furthermore, the vacuum degree of the vacuum degassing is 4-5 Pa, and the time of the vacuum degassing is 1-2 hours.

[0014] Furthermore, the pressure of the hot pressing molding is 1-1.2 MPa, the temperature of the hot pressing molding is 120-130° C., and the time of the hot pressing molding is 4-5 min.

[0015] Beneficial effects of the present invention: The invention provides an environmentally friendly mosquito repellent eraser and a preparation method thereof. The invention adds a self-made mosquito repellent to an eraser with calcium carbonate and PVC paste resin as main materials. Finally, after testing, the prepared environmentally friendly mosquito repellent eraser has excellent mosquito repellent effect while ensuring excellent erasing effect and mechanical properties. The specific principle is as follows: First, the homemade mosquito repellent of the present invention uses citronella oil as the main mosquito repellent component. Citronella oil is a natural plant extract containing citronella, geraniol and other components. These components have a special smell and can interfere with the olfactory system of mosquitoes, making it difficult for mosquitoes to locate the human body, thereby playing a role in repelling mosquitoes; then, the present invention wraps the citronella oil by microencapsulation to form microcapsules. Specifically, the present invention uses hydroxyethyl methacrylate and trimethylolpropane triacrylate as shell materials, citronella oil as core material, and adopts in-situ polymerization to prepare citronella oil microcapsules, i.e. mosquito repellent. The mosquito repellent in the form of microcapsules can slowly release citronella oil and extend its effective time for repelling mosquitoes. At the same time, the microcapsules can protect the effective components of citronella oil, reduce its volatilization and decomposition during storage and use, and improve the stability of the mosquito repellent.

[0016] Then, the present invention selects hydroxyethyl methacrylate and trimethylolpropane triacrylate to prepare microcapsule shell materials by in-situ polymerization under the action of an initiator azobisisobutyronitrile. Since hydroxyethyl methacrylate contains terminal hydroxyl groups, the surface of the prepared microcapsule is endowed with rich hydroxyl functional groups. During the mixing and stirring process of various raw materials of the eraser, the mosquito repellent with rich hydroxyl groups on the surface can interact (mainly in the form of hydrogen bonds) with calcium carbonate (the surface of the calcium carbonate contains hydroxyl groups), PVC paste resin (containing polar groups such as chlorine atoms) and stearic acid and its calcium and magnesium salts (containing carboxyl groups), thereby improving the interaction between the mosquito repellent and the eraser substrate, improving the stability of the mosquito repellent between the eraser substrate, and finally improving the stability of the mosquito repellent effect of the environmentally friendly mosquito repellent eraser.

[0017] Finally, erasers are commonly used stationery for students and other groups. In daily study and life, mosquito bites are a common problem. Combining mosquito repellent function with erasers meets people's dual pursuit of stationery practicality and mosquito prevention needs, making the product more competitive and attracting more consumers to buy. In addition, in the stationery market, product homogeneity is relatively common. The emergence of environmentally friendly mosquito repellent erasers provides stationery brands with opportunities for differentiated competition, helps brands establish a unique image and advantage, attracts more consumer attention and choice, and enhances the brand's market share and competitiveness. Furthermore, as consumers pay more attention to health and environmental protection, they are more inclined to choose natural, non-toxic and harmless products. Environmentally friendly mosquito repellent erasers are made of environmentally friendly materials such as natural raw materials extracted from plants, do not contain harmful chemicals, and meet consumers' requirements for environmental protection and health. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] Example 1

[0020] To prepare mosquito repellent: S1. At room temperature, citronella oil (85 / 38%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.), hydroxyethyl methacrylate (purity 96%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.), trimethylolpropane triacrylate (purity 85%; containing 100ppm MEHQ stabilizer; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.) and azobisisobutyronitrile (purity 98%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.) were mixed, and then magnetically stirred at a speed of 800r / min for 4min to obtain an oil phase, wherein the amount ratio of citronella oil, hydroxyethyl methacrylate, trimethylolpropane triacrylate and azobisisobutyronitrile was 2.5g:3g:2g:0.1g; S2. At room temperature, add an emulsifier to deionized water with stirring to obtain an aqueous phase, wherein the emulsifier is emulsifier EL-20, which is purchased from Tianjin Science and Technology Biochemical Technology Co., Ltd., and the amount of the emulsifier in the aqueous phase is 5.5wt%; S3. Add the oil phase to the water phase at a volume ratio of 1:10, emulsify at a high speed of 10000 r / min for 2 min, then heat the system to 78°C under nitrogen protection, and then stir and polymerize at a speed of 300 r / min for 8 h. After completion, citronella oil microcapsules are obtained, namely, mosquito repellent.

[0021] Example 2

[0022] To prepare mosquito repellent: S1. At room temperature, citronella oil (85 / 38%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.), hydroxyethyl methacrylate (purity 96%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.), trimethylolpropane triacrylate (purity 85%; containing 100ppm MEHQ stabilizer; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.) and azobisisobutyronitrile (purity 98%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.) were mixed, and then magnetically stirred at a speed of 800r / min for 5min to obtain an oil phase, wherein the amount ratio of citronella oil, hydroxyethyl methacrylate, trimethylolpropane triacrylate and azobisisobutyronitrile was 8g:3g:2g:0.1g; S2. At room temperature, add an emulsifier to deionized water with stirring to obtain an aqueous phase, wherein the emulsifier is emulsifier EL-40, which is purchased from Tianjin Science and Technology Biochemical Technology Co., Ltd., and the amount of the emulsifier in the aqueous phase is 6.5wt%; S3. Add the oil phase to the water phase at a volume ratio of 1:10, emulsify at a high speed of 10000 r / min for 2 min, then heat the system to 80°C under nitrogen protection, and then stir and polymerize at a speed of 300 r / min for 10 h. After completion, citronella oil microcapsules are obtained, namely, mosquito repellent.

[0023] Example 3

[0024] To prepare mosquito repellent: S1. At room temperature, citronella oil (85 / 38%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.), hydroxyethyl methacrylate (purity 96%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.), trimethylolpropane triacrylate (purity 85%; containing 100ppm MEHQ stabilizer; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.) and azobisisobutyronitrile (purity 98%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.) were mixed, and then magnetically stirred at a speed of 800r / min for 5min to obtain an oil phase, wherein the amount ratio of citronella oil, hydroxyethyl methacrylate, trimethylolpropane triacrylate and azobisisobutyronitrile was 10g:3g:2g:0.1g; S2. At room temperature, add an emulsifier to deionized water with stirring to obtain an aqueous phase, wherein the emulsifier is emulsifier EL-80, which is purchased from Tianjin Science and Technology Biochemical Technology Co., Ltd., and the amount of the emulsifier in the aqueous phase is 7.0wt%; S3. Add the oil phase to the water phase at a volume ratio of 1:10, emulsify at a high speed of 10000 r / min for 2 min, then heat the system to 80°C under nitrogen protection, and then stir and polymerize at a speed of 300 r / min for 10 h. After completion, citronella oil microcapsules are obtained, namely, mosquito repellent.

[0025] Example 4

[0026] Preparation of environmentally friendly mosquito repellent eraser: First, weigh each raw material according to the following mass percentage: Calcium carbonate 40%; PVC paste resin 28%; Plasticizer 20%; The mosquito repellent prepared in Example 1 7.5%; Stearic acid 1.5%; Zinc stearate 1.5%; Calcium stearate 1.5%.

[0027] Calcium carbonate was purchased from Sinopharm Chemical Reagent Co., Ltd.

[0028] The concentrated viscosity of PVC paste resin was 136 mL / g, and it was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0029] The plasticizer is a mixture of epoxidized soybean oil, glycerol and triethyl citrate in a mass ratio of 4:1:5, wherein the epoxidized soybean oil is CP grade, the glycerol is AR grade, and the purity of triethyl citrate is 98%, all of which are purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0030] The stearic acid model Lutacid SA50 was purchased from Sichuan Tianyu Oil Chemical Co., Ltd.

[0031] Among them, zinc stearate was CP grade and purchased from Tianjin Guangfu Technology Development Co., Ltd.

[0032] Among them, calcium stearate was AR grade and purchased from Tianjin Guangfu Technology Development Co., Ltd.

[0033] Then, stearic acid, zinc stearate and calcium stearate are stirred and mixed for 10min, then placed in high-speed ball mill and ball-milled for 100 orders, obtain mixed powder, then the mosquito repellent prepared by calcium carbonate, PVC paste resin, plasticizer, embodiment 1 and compound are placed in stirring kettle and stirred at room temperature for 10min, then be warming up to 50 ℃, stir at constant temperature for 1h, after stirring completes, after being cooled to room temperature, be evacuated to 4Pa, carry out vacuum deaeration, the vacuum deaeration time is 1h, after vacuum deaeration completes, obtain the eraser raw material, then the eraser raw material is poured into the mould and carried out hot pressing forming, the pressure of hot pressing forming is 1MPa, the temperature of hot pressing forming is 120 ℃, and the time of hot pressing forming is 4min, after hot pressing forming completes, be cooled to room temperature, then cut and polish to required size and shape after the demoulding, obtain the environmental protection mosquito repellent eraser.

[0034] Example 5

[0035] Preparation of environmentally friendly mosquito repellent eraser: First, weigh each raw material according to the following mass percentage: Calcium carbonate 45%; PVC paste resin 27%; Plasticizer 18%; The mosquito repellent prepared in Example 2 7%; Stearic acid 1%; Zinc stearate 1%; Calcium stearate 1%.

[0036] Calcium carbonate was purchased from Sinopharm Chemical Reagent Co., Ltd.

[0037] The concentrated viscosity of PVC paste resin was 136 mL / g, and it was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0038] The plasticizer is a mixture of epoxidized soybean oil, glycerol and tributyl citrate in a mass ratio of 3:1:6, wherein the epoxidized soybean oil is CP grade, the glycerol is AR grade, and the purity of tributyl citrate is 98%, all of which are purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0039] The stearic acid model Lutacid SA50 was purchased from Sichuan Tianyu Oil Chemical Co., Ltd.

[0040] Among them, zinc stearate was CP grade and purchased from Tianjin Guangfu Technology Development Co., Ltd.

[0041] Among them, calcium stearate was AR grade and purchased from Tianjin Guangfu Technology Development Co., Ltd.

[0042] Then, stearic acid, zinc stearate and calcium stearate are stirred and mixed for 20min, then placed in high-speed ball mill and ball-milled for 100 orders, obtain mixed powder, then the mosquito repellent prepared by calcium carbonate, PVC paste resin, plasticizer, embodiment 2 and compound are placed in stirring tank and stirred at room temperature for 20min, then be warming up to 55 ℃, stir at constant temperature for 2h, after stirring completes, after being cooled to room temperature, be evacuated to 5Pa, carry out vacuum deaeration, the vacuum deaeration time is 2h, after vacuum deaeration completes, obtain the eraser raw material, then the eraser raw material is poured into the mould and carried out hot pressing forming, the pressure of hot pressing forming is 1.2MPa, the temperature of hot pressing forming is 123 ℃, and the time of hot pressing forming is 5min, after hot pressing forming completes, be cooled to room temperature, then cut and polish to required size and shape after the demoulding, obtain the environmental protection mosquito repellent eraser.

[0043] Example 6

[0044] Preparation of environmentally friendly mosquito repellent eraser: First, weigh each raw material according to the following mass percentage: Calcium carbonate 50%; PVC paste resin 25%; Plasticizer 18%; The mosquito repellent prepared in Example 3 5.5%; Stearic acid 0.5%; Zinc stearate 0.5%; Calcium stearate 0.5%.

[0045] Calcium carbonate was purchased from Sinopharm Chemical Reagent Co., Ltd.

[0046] The concentrated viscosity of PVC paste resin was 136 mL / g, and it was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0047] The plasticizer is a mixture of epoxidized soybean oil, glycerol and tributyl citrate in a mass ratio of 2:1:7, wherein the epoxidized soybean oil is CP grade, the glycerol is AR grade, and the purity of tributyl citrate is 98%, all of which are purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0048] The stearic acid model Lutacid SA50 was purchased from Sichuan Tianyu Oil Chemical Co., Ltd.

[0049] Among them, zinc stearate was CP grade and purchased from Tianjin Guangfu Technology Development Co., Ltd.

[0050] Among them, calcium stearate was AR grade and purchased from Tianjin Guangfu Technology Development Co., Ltd.

[0051] Then, stearic acid, zinc stearate and calcium stearate are stirred and mixed for 20min, then placed in high-speed ball mill and ball-milled for 100 orders, obtain mixed powder, then the mosquito repellent prepared by calcium carbonate, PVC paste resin, plasticizer, embodiment 3 and compound are placed in stirring tank and stirred at room temperature for 20min, then be warming up to 60 ℃, stir at constant temperature for 2h, after stirring completes, after being cooled to room temperature, be evacuated to 5Pa, carry out vacuum deaeration, the vacuum deaeration time is 2h, after vacuum deaeration completes, obtain the eraser raw material, then the eraser raw material is poured into the mould and carried out hot pressing forming, the pressure of hot pressing forming is 1.2MPa, the temperature of hot pressing forming is 130 ℃, and the time of hot pressing forming is 5min, after hot pressing forming completes, be cooled to room temperature, then cut and polish to required size and shape after the demoulding, obtain the environmental protection mosquito repellent eraser.

[0052] Comparative Example 1 Comparative Example 1 is the control group of Example 5, in which the mosquito repellent prepared in Example 2 in Example 5 is replaced with citronella oil (85 / 38%; purchased from Shanghai MacLean Biochemical Technology Co., Ltd.), and the remaining raw materials, raw material amounts and preparation steps are kept consistent with those in Example 5, and finally an environmentally friendly mosquito repellent eraser is obtained.

[0053] Comparative Example 2 Comparative Example 2 is the control group of Example 5, the mosquito repellent prepared in Example 2 in Example 5 is removed, and the remaining raw materials, raw material amounts and preparation steps are kept consistent with those in Example 5, and an eraser is finally obtained.

[0054] Test Example 1 The erasing rubber of embodiment 4~embodiment 6 and comparative example 1~comparative example 2 final preparation is carried out performance test, and the performance test process is as follows, and the test result is as shown in table 1: Erasure rate: The erasure rate is tested in accordance with the provisions of 5.4.2 of the Light Industry Standard of the People's Republic of China QB / T2309-2020 "Erasers".

[0055] Hardness: Referring to the provisions of 5.4.1 in the light industry standard QB / T2309-2020 "Eraser" of the People's Republic of China, the LX-A hardness tester of Shanghai Liuling Instrument Factory was used for Shore hardness test.

[0056] Attack power test: About 150 female Aedes albopictus mosquitoes (hereinafter referred to as test mosquitoes) are placed in a 40cm×30cm×30cm mosquito cage. The experimenter puts his hand into the mosquito cage for 2 minutes. If more than 30 test mosquitoes come and land, the attack power is qualified and can be used for human repellent test.

[0057] Human body repellency test: prepare erasers, take erasers produced by the same group of embodiments / comparative examples, and divide them into 10 groups on average. Each group is independently subjected to the human body repellency test. The average value of the test results of 10 groups is taken for a single group of embodiments / comparative examples. Specifically, the human body repellency test process is as follows: 40 mm×40 mm of skin is exposed on the backs of both hands of the experimenter, and the rest is covered. One hand does not use any mosquito repellent product as a control group, and the other hand holds an eraser as a test group. The two hands are successively put into a mosquito cage containing test mosquitoes, and the number of test mosquitoes biting the exposed skin within 2 minutes is recorded, which is recorded as the number of bites. The average value of the test results of 10 groups is taken for a single group of embodiments / comparative examples, and the effective protection rate of the eraser to the skin is calculated according to the following formula: .

[0058] Durability of human repellency test: Erasers that were placed 90 days after production were subjected to human repellency test. The specific test process was the same as above, and the effective protection rate after 90 days was finally calculated.

[0059] Table 1 Test results project Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Experimental paper-erasure rate / % 92.0 95.3 94.8 95.1 95.7 Shore hardness / A 61 67 65 66 69 Effective protection rate / % 89.8 93.4 91.3 86.5 7.5 90-day effective protection rate / % 83.5 88.2 85.4 44.0 5.0 As can be seen from Table 1, the erasing rubber prepared by the embodiment of the present invention 4~embodiment 6 has excellent erasing performance and mechanical property, shows excellent mosquito repellent effect simultaneously.

[0060] It should be noted that, in this article, terms such as "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or equipment that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly mosquito repellent eraser, characterized in that: It is composed of the following raw materials in percentage by weight: Calcium carbonate 40% to 50%; PVC paste resin 25%~28%; Plasticizer 18%~20%; Mosquito repellent 5.5% to 7.5%; Stearic acid 0.5%~1.5%; Zinc stearate 0.5%~1.5%; Calcium stearate 0.5%~1.5%.

2. An environmentally friendly mosquito repellent eraser according to claim 1, characterized in that: The plasticizer is prepared by mixing epoxy soybean oil, glycerin and citric acid ester plasticizer in a mass ratio of 2-4:1:5-7.

3. An environmentally friendly mosquito repellent eraser according to claim 2, characterized in that: The citrate plasticizer is triethyl citrate or tributyl citrate.

4. The environmentally friendly mosquito repellent eraser according to claim 1, characterized in that: The mosquito repellent is prepared by the following steps: At room temperature, citronella oil, hydroxyethyl methacrylate, trimethylolpropane triacrylate and azobisisobutyronitrile are mixed, and then magnetically stirred at a speed of 800 r / min for 4-5 minutes to obtain an oil phase, and then an emulsifier is added to deionized water with stirring to obtain a water phase, and the oil phase is added to the water phase, and high-speed shear emulsification is performed at 10000 r / min for 2 minutes, and then the system is heated to 78-80°C under nitrogen protection, and then stirred and polymerized at a speed of 300 r / min for 8-10 hours. After completion, a mosquito repellent is obtained.

5. The environmentally friendly mosquito repellent eraser according to claim 4, characterized in that: The usage ratio of the citronella oil, hydroxyethyl methacrylate, trimethylolpropane triacrylate and azobisisobutyronitrile is 2.5-10g:3g:2g:0.1g.

6. The environmentally friendly mosquito repellent eraser according to claim 4, characterized in that: The emulsifier is one of emulsifier EL-20, emulsifier EL-40 and emulsifier EL-80; the amount of the emulsifier in the water phase is 5.5-7.0wt%.

7. The environmentally friendly mosquito repellent eraser according to claim 4, characterized in that: The volume ratio of the oil phase to the water phase is 1:

10.

8. The method for preparing an environmentally friendly mosquito repellent eraser according to any one of claims 1 to 7, characterized in that: The following steps are involved: Firstly, each raw material is weighed according to the above mass percentage, and then stearic acid, zinc stearate and calcium stearate are stirred and mixed for 10-20 minutes, and then placed in a high-speed ball mill for ball milling through 100 meshes to obtain a mixed powder, and then calcium carbonate, PVC paste resin, plasticizer, mosquito repellent and the mixture are placed in a stirring kettle and stirred at room temperature for 10-20 minutes, and then the temperature is raised to 50-60° C. and stirred at a constant temperature for 1-2 hours. After the stirring is completed, the raw materials are cooled to room temperature and then vacuum degassing is performed to obtain an eraser raw material, and then the eraser raw material is poured into a mold for hot pressing molding. After the hot pressing molding is completed, the raw materials are cooled to room temperature, and then the raw materials are cut and polished to a required size and shape after demolding to obtain a mosquito repellent eraser.

9. The method for preparing an environmentally friendly mosquito repellent eraser according to claim 8, characterized in that: The vacuum degree of the vacuum degassing is 4-5 Pa, and the time of the vacuum degassing is 1-2 hours.

10. The method for preparing an environmentally friendly mosquito repellent eraser according to claim 8, characterized in that: The pressure of the hot pressing molding is 1-1.2 MPa, the temperature of the hot pressing molding is 120-130° C., and the time of the hot pressing molding is 4-5 minutes.