CN109819980B - Slow-release mosquito-proof insect-repellent incense bead and preparation method thereof - Google Patents
Slow-release mosquito-proof insect-repellent incense bead and preparation method thereof Download PDFInfo
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
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- Agricultural Chemicals And Associated Chemicals (AREA)
- Fats And Perfumes (AREA)
Abstract
The invention relates to a slow-release mosquito-proof insect-repellent incense bead and a preparation method thereof, belonging to the technical field of mosquito-proof articles. In order to solve the problems of poor mosquito-proof and insect-repellent effect and poor fragrance durability of the existing fragrant bead, the invention provides a slow-release mosquito-proof and insect-repellent fragrant bead which comprises the following components in parts by mass: 8-15 parts of green Chinese onion oil, 8-13 parts of spearmint oil, 5-10 parts of blumea oil, 4-9 parts of rosemary oil, 3-8 parts of lemon oil, 3-8 parts of grassleaf sweelflag rhizome oil, 150-300 parts of beta-cyclodextrin and 200-350 parts of EVA resin. The invention uses the scallion volatile oil, spearmint oil, blumea oil, rosemary oil, lemon oil and grassleaf sweelflag rhizome oil as raw materials, synergically exerts the mosquito-proof and insect-expelling effect, and simultaneously uses the cyclodextrin inclusion technology to prepare the fragrant beads to slowly release the volatile oil, thereby prolonging the effective time of mosquito-proof and insect-expelling.
Description
Technical Field
The invention belongs to the technical field of mosquito-proof articles, and particularly relates to a slow-release mosquito-proof insect-repellent incense bead and a preparation method thereof.
Background
Mosquitoes suck human blood to spread diseases, the human health is seriously harmed, and particularly in summer, the mosquitoes are overflowed, and certain trouble is caused to the life of people. The air freshener mostly exists in the forms of liquid, gel, spray and the like, and the effective components mostly contain chemical bactericides such as hydrogen peroxide, pyrethroids, aldehydes and the like, so that the air freshener can cause serious damage to human bodies after being used for a long time.
CN 107557154A discloses a natural peony fragrant bead and a preparation and fragrance blending method thereof, which is prepared by mixing spice raw material powders such as peony, clove, angelica dahurica, benzoin and the like and then adding an adhesive and the like, and has strong granular feeling and poor fragrance persistence. CN 104381326 a discloses a mildew-proof bactericidal incense bead, which is prepared by adding traditional Chinese medicine raw material powder with bactericidal effect such as jasmine, cassia bark, lemon and the like into molten EVA resin, but the incense bead has the advantages of rapid smell loss, non-lasting fragrance and unobvious effect. CN 104189935A discloses a peony fragrant bead and a preparation method thereof, the peony fragrant bead is mainly prepared by mixing and crushing tens of raw materials of jasmine, rose, kudzuvine flower, hibiscus, lotus, lily and the like, and adding yellow wine and water to the mixture, and the peony fragrant bead is complex and strong in fragrance and can be rapidly lost.
The existing aromatic bead plays a role in a form of a flavoring agent, has poor mosquito-proof and insect-repellent effects, and has quick fragrance loss and poor durability. The prior art still can not provide a fragrant pearl that can mosquito-proof expelling parasite of high efficiency and effect are lasting.
Disclosure of Invention
In order to solve the problems of poor mosquito-proof and insect-repellent effect and poor fragrance durability of the existing fragrant bead, the invention provides a slow-release mosquito-proof and insect-repellent fragrant bead and a preparation method thereof.
The technical scheme of the invention is as follows:
the slow-release mosquito-proof insect-repellent incense bead comprises the following components in parts by mass:
8-15 parts of green Chinese onion oil, 8-13 parts of spearmint oil, 5-10 parts of blumea oil, 4-9 parts of rosemary oil, 3-8 parts of lemon oil, 3-8 parts of grassleaf sweelflag rhizome oil, 150-300 parts of beta-cyclodextrin and 200-350 parts of EVA resin.
Further, the composition comprises the following components in parts by mass: 10-13 parts of welsh onion oil, 9-12 parts of spearmint oil, 6-8 parts of blumea oil, 5-8 parts of rosemary oil, 4-6 parts of lemon oil, 4-6 parts of grassleaf sweelflag rhizome oil, 200-260 parts of beta-cyclodextrin and 280-320 parts of EVA resin.
Further, the composition comprises the following components in parts by mass: 12 parts of welsh onion oil, 10 parts of spearmint oil, 6 parts of blumea oil, 7 parts of rosemary oil, 6 parts of lemon oil, 5 parts of grassleaf sweelflag rhizome oil, 240 parts of beta-cyclodextrin and 300 parts of EVA resin.
Further, the EVA resin is food grade, and the content of the vinyl acetate in the EVA resin is 10-35%.
A preparation method of a slow-release mosquito-proof insect-repellent incense bead comprises the following steps:
step one, weighing the following components in parts by weight: 8-15 parts of green Chinese onion oil, 8-13 parts of spearmint oil, 5-10 parts of blumea oil, 4-9 parts of rosemary oil, 3-8 parts of lemon oil, 3-8 parts of grassleaf sweelflag rhizome oil, 150-300 parts of beta-cyclodextrin and 200-350 parts of EVA resin;
step two, adding the scallion oil, spearmint oil, blumea oil, rosemary oil, lemon oil and grassleaf sweelflag rhizome oil prepared in the step one into absolute ethyl alcohol according to a certain volume ratio, and uniformly mixing to obtain mixed volatile oil;
step three, adding purified water into the beta-cyclodextrin prepared in the step one according to a certain mass-volume ratio, uniformly grinding, adding the mixed volatile oil obtained in the step two, stirring at constant temperature for 3 hours, storing at 0-4 ℃ for 24 hours, and performing suction filtration to obtain an inclusion compound;
step four, placing the inclusion compound obtained in the step three at a certain temperature, drying in vacuum for a certain time, and sieving to obtain volatile oil solid powder;
and step five, melting the EVA resin prepared in the step one, adding the volatile oil solid powder obtained in the step four, and grinding and mixing uniformly to prepare the slow-release mosquito-repellent incense bead with a certain particle size.
Further, the volume ratio of the total volume of the welsh onion oil, the spearmint oil, the blumea oil, the rosemary oil, the lemon oil and the grassleaf sweelflag rhizome oil to the absolute ethyl alcohol in the step two is 1: 1. Further, the mass volume ratio of the beta-cyclodextrin to the purified water in the third step is 1g (4-10) mL, the constant-temperature stirring temperature is 20-30 ℃, and the stirring speed is 1000 rpm.
Furthermore, the mass volume ratio of the beta-cyclodextrin and the purified water in the third step is 1g (5-8) mL.
Further, in the fourth step, the vacuum drying temperature is 45-50 ℃, the vacuum drying time is 5 hours, and the sieving is 80-120 meshes.
Further, in the fifth step, the melting temperature of the EVA resin is 70-85 ℃, the EVA resin is food grade, the content of the vinyl acetate in the EVA resin is 10% -35%, and the particle size of the slow-release mosquito-proof insect-repellent incense beads is 5-10 mm.
The invention has the beneficial effects that:
according to the invention, the welsh onion oil, the blumea oil, the spearmint oil, the rosemary oil, the lemon oil and the grassleaf sweelflag rhizome oil are adopted to synergistically enhance the mosquito-proof and insect-repellent effects, the volatile oil and the cyclodextrin are mixed and then added with resin to prepare the fragrant beads, the effect of slowly releasing volatile gas is achieved, the effective time of mosquito-proof and insect-repellent is prolonged, the elegant and pleasant smell is released, and the effect of refreshing air is achieved while preventing and repelling mosquitoes.
The sustained-release mosquito-proof insect-repellent incense bead prepared by the invention has stable dosage form, improves the stability of the volatile oil, effectively prevents the volatile oil from going bad, prolongs the effective time of the incense bead, does not contain any chemical additive, is safe and nontoxic, is convenient to use and store, and can be widely applied to vehicles, rooms, wardrobe, toilets and other places to achieve the effects of refreshing air, preventing mosquitoes and expelling insects.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Example 1
The slow-release mosquito-proof insect-repellent incense bead comprises the following components in parts by mass:
8-15 parts of green Chinese onion oil, 8-13 parts of spearmint oil, 5-10 parts of blumea oil, 4-9 parts of rosemary oil, 3-8 parts of lemon oil, 3-8 parts of grassleaf sweelflag rhizome oil, 150-300 parts of beta-cyclodextrin and 200-350 parts of EVA resin.
Example 2
The slow-release mosquito-proof insect-repellent incense bead comprises the following components in parts by mass:
10-13 parts of welsh onion oil, 9-12 parts of spearmint oil, 6-8 parts of blumea oil, 5-8 parts of rosemary oil, 4-6 parts of lemon oil, 4-6 parts of grassleaf sweelflag rhizome oil, 200-260 parts of beta-cyclodextrin and 280-320 parts of EVA resin.
Example 3
The slow-release mosquito-proof insect-repellent incense bead comprises the following components in parts by mass: 12 parts of welsh onion oil, 10 parts of spearmint oil, 6 parts of blumea oil, 7 parts of rosemary oil, 6 parts of lemon oil, 5 parts of grassleaf sweelflag rhizome oil, 240 parts of beta-cyclodextrin and 300 parts of EVA resin.
Example 4
The slow-release mosquito-proof insect-repellent incense bead comprises the following components in parts by mass: 11 parts of welsh onion oil, 11 parts of spearmint oil, 7 parts of blumea oil, 6 parts of rosemary oil, 5 parts of lemon oil, 6 parts of grassleaf sweelflag rhizome oil, 250 parts of beta-cyclodextrin and 310 parts of EVA resin, wherein the EVA resin is food grade in the embodiment, and the vinyl acetate content in the EVA resin is 15%.
Example 5
A preparation method of a slow-release mosquito-proof insect-repellent incense bead comprises the following steps:
step one, weighing the following components in parts by weight: 8-15 parts of green Chinese onion oil, 8-13 parts of spearmint oil, 5-10 parts of blumea oil, 4-9 parts of rosemary oil, 3-8 parts of lemon oil, 3-8 parts of grassleaf sweelflag rhizome oil, 150-300 parts of beta-cyclodextrin and 200-350 parts of EVA resin;
step two, adding the scallion oil, spearmint oil, blumea oil, rosemary oil, lemon oil and grassleaf sweelflag rhizome oil prepared in the step one into absolute ethyl alcohol according to a certain volume ratio, and uniformly mixing to obtain mixed volatile oil;
step three, adding purified water into the beta-cyclodextrin prepared in the step one according to a certain mass-volume ratio, uniformly grinding, adding the mixed volatile oil obtained in the step two, stirring at constant temperature for 3 hours, storing at 0-4 ℃ for 24 hours, and performing suction filtration to obtain an inclusion compound;
step four, placing the inclusion compound obtained in the step three at a certain temperature, drying in vacuum for a certain time, and sieving to obtain volatile oil solid powder;
and step five, melting the EVA resin prepared in the step one, adding the volatile oil solid powder obtained in the step four, and grinding and mixing uniformly to prepare the slow-release mosquito-repellent incense bead with a certain particle size.
Example 6
A preparation method of a slow-release mosquito-proof insect-repellent incense bead comprises the following steps:
step one, weighing the following components in parts by weight: 9 parts of welsh onion oil, 8 parts of spearmint oil, 8 parts of blumea oil, 6 parts of rosemary oil, 7 parts of lemon oil, 4 parts of grassleaf sweelflag rhizome oil, 200 parts of beta-cyclodextrin and 230 parts of EVA resin, wherein the EVA resin is food grade, and the content of vinyl acetate in the EVA resin is 12%;
step two, adding the scallion oil, spearmint oil, blumea oil, rosemary oil, lemon oil and grassleaf sweelflag rhizome oil prepared in the step one into absolute ethyl alcohol according to the volume ratio of the sum of the scallion oil, spearmint oil, blumea oil, rosemary oil, lemon oil and grassleaf sweelflag rhizome oil to the absolute ethyl alcohol of 1:1, and uniformly mixing to obtain mixed volatile oil;
step three, adding purified water into the beta-cyclodextrin prepared in the step one according to the mass volume ratio of the beta-cyclodextrin to the purified water of 1g:5mL, uniformly grinding, slowly adding the mixed volatile oil obtained in the step two, stirring at the constant temperature of 25 ℃ for 3 hours, storing at the temperature of 0-4 ℃ for 24 hours, and performing suction filtration to obtain an inclusion compound;
step four, placing the inclusion compound obtained in the step three at 45 ℃ for vacuum drying for 5 hours, and sieving the inclusion compound with a 80-mesh sieve to obtain volatile oil solid powder;
step five, melting the EVA resin prepared in the step one at 75 ℃, adding the volatile oil solid powder obtained in the step four, and grinding and mixing uniformly to obtain the slow-release mosquito-proof insect-repellent incense bead with the particle size of 5 mm.
The preparation method of the green Chinese onion volatile oil in the embodiment comprises the following steps: adding water into the scallion according to the mass ratio of 1:4, heating to boil, keeping the boiling for extraction for 5-8 hours, and collecting volatile oil.
Spearmint oil, blumea oil, rosemary oil, lemon oil and grassleaf sweelflag rhizome oil are all commercially available.
Example 7
A preparation method of a slow-release mosquito-proof insect-repellent incense bead comprises the following steps:
step one, weighing the following components in parts by weight: 10 parts of welsh onion oil, 9 parts of spearmint oil, 10 parts of blumea oil, 7 parts of rosemary oil, 6 parts of lemon oil, 5 parts of grassleaf sweelflag rhizome oil, 250 parts of beta-cyclodextrin and 320 parts of EVA resin, wherein the EVA resin is food grade, and the content of vinyl acetate in the EVA resin is 12%;
step two, adding the scallion oil, spearmint oil, blumea oil, rosemary oil, lemon oil and grassleaf sweelflag rhizome oil prepared in the step one into absolute ethyl alcohol according to the volume ratio of the sum of the scallion oil, spearmint oil, blumea oil, rosemary oil, lemon oil and grassleaf sweelflag rhizome oil to the absolute ethyl alcohol of 1:1, and uniformly mixing to obtain mixed volatile oil;
step three, adding purified water into the beta-cyclodextrin prepared in the step one according to the mass-volume ratio of the beta-cyclodextrin to the purified water of 1g:6mL, uniformly grinding, slowly adding the mixed volatile oil obtained in the step two, stirring at the constant temperature of 30 ℃ for 3 hours, storing at the temperature of 0-4 ℃ for 24 hours, and performing suction filtration to obtain an inclusion compound;
step four, placing the inclusion compound obtained in the step three at 45 ℃ for vacuum drying for 5 hours, and sieving the inclusion compound with a 100-mesh sieve to obtain volatile oil solid powder;
and step five, melting the EVA resin prepared in the step one at 80 ℃, adding the volatile oil solid powder obtained in the step four, and grinding and mixing uniformly to obtain the slow-release mosquito-proof insect-repellent incense bead with the particle size of 10 mm.
Example 8
A preparation method of a slow-release mosquito-proof insect-repellent incense bead comprises the following steps:
step one, weighing the following components in parts by weight: 8 parts of welsh onion oil, 13 parts of spearmint oil, 9 parts of blumea oil, 8 parts of rosemary oil, 8 parts of lemon oil, 7 parts of grassleaf sweelflag rhizome oil, 300 parts of beta-cyclodextrin and 300 parts of EVA resin, wherein the EVA resin is food grade, and the vinyl acetate content in the EVA resin is 15%;
step two, adding the scallion oil, spearmint oil, blumea oil, rosemary oil, lemon oil and grassleaf sweelflag rhizome oil prepared in the step one into absolute ethyl alcohol according to the volume ratio of the sum of the scallion oil, spearmint oil, blumea oil, rosemary oil, lemon oil and grassleaf sweelflag rhizome oil to the absolute ethyl alcohol of 1:1, and uniformly mixing to obtain mixed volatile oil;
step three, adding purified water into the beta-cyclodextrin prepared in the step one according to the mass-volume ratio of the beta-cyclodextrin to the purified water of 1g to 8mL, uniformly grinding, slowly adding the mixed volatile oil obtained in the step two, stirring at the constant temperature of 30 ℃ for 3 hours, storing at the temperature of 0-4 ℃ for 24 hours, and performing suction filtration to obtain an inclusion compound;
step four, placing the inclusion compound obtained in the step three at 50 ℃ for vacuum drying for 5 hours, and sieving the inclusion compound with a 80-mesh sieve to obtain volatile oil solid powder;
step five, melting the EVA resin prepared in the step one at 85 ℃, adding the volatile oil solid powder obtained in the step four, and grinding and mixing uniformly to obtain the slow-release mosquito-proof insect-repellent incense bead with the particle size of 5 mm.
Comparative example 1
The comparative example provides an anti-mosquito and insect-repellent incense bead without inclusion treatment, which consists of the following raw materials in parts by mass:
8 parts of welsh onion oil, 13 parts of spearmint oil, 9 parts of blumea oil, 8 parts of rosemary oil, 8 parts of lemon oil, 7 parts of grassleaf sweelflag rhizome oil and 600 parts of EVA resin. The preparation method comprises the following steps: uniformly mixing the volatile oil in parts by weight to obtain mixed volatile oil; melting EVA resin at 85 deg.C, adding the mixed volatile oil, mixing, and making into fragrant bead with diameter of 5 mm.
Sensory evaluation of the fragrance beads prepared in examples 6, 7, 8 and comparative example 1
The evaluation method comprises the following steps: randomly selecting 10 persons as evaluators to perform olfactory scoring on the odor emitted by the fragrance beads, wherein the full score is 10 points, and the evaluation result is shown in table 1:
TABLE 1
As can be seen from the data in Table 1, the incense beads prepared in examples 6, 7 and 8 have higher scores, the average score is more than or equal to 9, while the incense beads prepared in comparative example 1 have lower scores, because the incense beads prepared in comparative example 1 do not adopt an inclusion technology, and the odor is more strongly stimulated due to the release of a large amount of volatile oil; in the processes of preparing the fragrant beads, the volatile oil components in the examples 6, 7 and 8 are included by adopting a cyclodextrin inclusion technology, so that the natural plant volatile oil can be slowly released into the air, the strong smell of the fragrant beads is reduced, meanwhile, the spearmint oil, the blumea oil, the rosemary oil, the lemon oil and the grassleaf sweelflag rhizome oil can effectively cover the special smell of the green Chinese onion volatile oil, the elegant, fragrant and pleasant smell is released, and the effects of preventing mosquitoes and expelling insects and refreshing the air are achieved.
Mosquito repellent experiments were performed on the incense beads prepared in example 8 and comparative example 1:
1. attack force experiment: 300 female mosquitoes are placed in a mosquito cage with the length of 60 multiplied by 45cm, a subject puts hands into the mosquito cage and stays for 2min, and more than 30 subjects who come and stop are qualified in attack power and can be used for a human body repelling experiment;
2. human body repelling experiment: and 5 persons qualified in the attack force experiment are tested, wherein 1 person is used as a blank control group, the other 4 persons are respectively provided with 10 fragrant beads of a corresponding group at the palm of one hand to be used as an experiment group, the control group and the experiment group respectively extend the hand into mosquito cages with qualified attack force to stay for 2min, the presence or absence of mosquitoes is observed to suck blood, the test is carried out for 1 time every 1 hour, and the effective protection rates of the 2h, 4h, 6h, 8h, 10h and 12h are calculated.
Effective protection rate (%) (average number of stings in control group-average number of stings in experimental group)/average number of stings in control group × 100%;
the results of the experiment are shown in table 2:
TABLE 2
As can be seen from the data in table 2, the effective protection rate of the sustained-release mosquito and insect repellent incense bead prepared in example 8 is always maintained at 100% within 8 hours, and the effective protection rate of 12 hours is still maintained at 98.7%. Comparative example 1 no inclusion technique was used in the preparation of the fragrant beads, and although the amount of the plant volatile oil was the same as that used in example 8, the effective protection rate of the fragrant beads prepared was gradually decreased from 6 hours to 12 hours, which was only 50.6%. As can be seen by comparing the data of the example 8 with the data of the comparative example 1, the volatile oil is included by the cyclodextrin inclusion technology in the example 8, so that the release of the volatile oil can be remarkably delayed, and the effective mosquito-proof time of the incense beads can be prolonged.
Sustained release effect test of the fragrant beads prepared in example 8 and comparative example 1
The test method comprises the following steps: weighing 3 parts of each of the aromatic beads prepared in example 8 and comparative example 1, weighing the initial weight, placing the initial weight in a constant temperature drying oven at 40 ℃, measuring the weight on the 5 th day and the 10 th day respectively, calculating the volatile oil loss ratio (%),
volatile oil loss ratio (%) ═ (initial weight-measured weight)/initial weight × 100%; the results are shown in Table 3;
TABLE 3
As can be seen from the data in table 3, compared with comparative example 1, the volatile oil in example 8 is slowly lost, which indicates that the cyclodextrin inclusion technology can effectively delay the release of the volatile oil and prolong the effective time of the pearls for preventing and expelling mosquitoes.
Claims (9)
1. The slow-release mosquito-proof insect-repellent incense bead is characterized by comprising the following components in parts by mass:
8-15 parts of green Chinese onion oil, 8-13 parts of spearmint oil, 5-10 parts of blumea oil, 4-9 parts of rosemary oil, 3-8 parts of lemon oil, 3-8 parts of grassleaf sweelflag rhizome oil, 150-300 parts of beta-cyclodextrin and 200-350 parts of EVA resin;
the preparation method of the slow-release mosquito-proof insect-repellent incense bead comprises the following steps:
step one, weighing the following components in parts by weight: 8-15 parts of green Chinese onion oil, 8-13 parts of spearmint oil, 5-10 parts of blumea oil, 4-9 parts of rosemary oil, 3-8 parts of lemon oil, 3-8 parts of grassleaf sweelflag rhizome oil, 150-300 parts of beta-cyclodextrin and 200-350 parts of EVA resin;
step two, adding the scallion oil, spearmint oil, blumea oil, rosemary oil, lemon oil and grassleaf sweelflag rhizome oil prepared in the step one into absolute ethyl alcohol according to a certain volume ratio, and uniformly mixing to obtain mixed volatile oil;
step three, adding purified water into the beta-cyclodextrin prepared in the step one according to a certain mass-volume ratio, uniformly grinding, adding the mixed volatile oil obtained in the step two, stirring at constant temperature for 3 hours, storing at 0-4 ℃ for 24 hours, and performing suction filtration to obtain an inclusion compound;
step four, placing the inclusion compound obtained in the step three at a certain temperature, drying in vacuum for a certain time, and sieving to obtain volatile oil solid powder;
and step five, melting the EVA resin prepared in the step one, adding the volatile oil solid powder obtained in the step four, and grinding and mixing uniformly to prepare the slow-release mosquito-repellent incense bead with a certain particle size.
2. The slow-release mosquito-proof insect-repellent incense bead as claimed in claim 1, which is characterized by comprising the following components in parts by mass: 10-13 parts of welsh onion oil, 9-12 parts of spearmint oil, 6-8 parts of blumea oil, 5-8 parts of rosemary oil, 4-6 parts of lemon oil, 4-6 parts of grassleaf sweelflag rhizome oil, 200-260 parts of beta-cyclodextrin and 280-320 parts of EVA resin.
3. The slow-release mosquito-proof insect-repellent incense bead as claimed in claim 1, which is characterized by comprising the following components in parts by mass: 12 parts of welsh onion oil, 10 parts of spearmint oil, 6 parts of blumea oil, 7 parts of rosemary oil, 6 parts of lemon oil, 5 parts of grassleaf sweelflag rhizome oil, 240 parts of beta-cyclodextrin and 300 parts of EVA resin.
4. The slow-release mosquito-proof insect-repellent incense bead as claimed in any one of claims 1 to 3, wherein the EVA resin is food grade, and the content of vinyl acetate in the EVA resin is 10-35%.
5. The slow-release mosquito-proof insect-repellent incense bead as claimed in claim 4, wherein the volume ratio of the total volume of the welsh onion oil, spearmint oil, blumea oil, rosemary oil, lemon oil and grassleaf sweelflag rhizome oil to the absolute ethyl alcohol in the step two is 1: 1.
6. The slow-release mosquito-proof insect-repellent incense bead as claimed in claim 5, wherein the mass volume ratio of the beta-cyclodextrin to the purified water in the third step is 1g (4-10) mL, the temperature of constant-temperature stirring is 20-30 ℃, and the stirring speed is 1000 rpm.
7. The slow-release mosquito-proof insect-repellent incense bead as claimed in claim 6, wherein the mass volume ratio of the beta-cyclodextrin and the purified water in the third step is 1g (5-8) mL.
8. The slow-release mosquito-proof insect-repellent incense bead as claimed in claim 7, wherein the temperature of vacuum drying in the step four is 45-50 ℃, the time of vacuum drying is 5 hours, and the sieving is 80-120 mesh.
9. The slow-release mosquito-proof insect-repellent incense bead as claimed in claim 8, wherein in the fifth step, the melting temperature of the EVA resin is 70-85 ℃, the EVA resin is food grade, the content of the vinyl acetate in the EVA resin is 10% -35%, and the particle size of the slow-release mosquito-proof insect-repellent incense bead is 5-10 mm.
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