TWI645001B - Plant essential oil microcapsule sterilization anti-mold coating and preparation method and application thereof - Google Patents

Abstract

The invention discloses a plant essential oil microcapsule sterilization antifungal coating and a preparation method and application thereof, comprising the following components by weight: 120-150 parts by weight of polymer emulsion, 3-5 parts by weight of hydroxyethyl cellulose, pure water 350 -450 parts by weight, 180-220 parts by weight of the filler, 12-120 parts by weight of the nano pigment, 10-20 parts by weight of the plant essential oil microcapsules and 7-28 parts by weight of the functional auxiliary; wherein the plant essential oil microcapsule is a camphor plant The essential oil microcapsules are obtained by the following steps of infrared radiation dehydration, nano grinding, boiling water distillation, ether extraction and ultrasonic embedding. The bactericidal active ingredient in the bactericidal essential oil microcapsules can reduce the influence of the external environment, has a sustained release effect, prolongs the bactericidal and mildew-proof aging, and can be widely applied to handicrafts.

Description

Plant essential oil microcapsule sterilization anti-mold coating and preparation method and application thereof

The invention relates to the technical field of handicraft coatings, in particular to a plant essential oil microcapsule sterilization anti-mold coating, a preparation method and application thereof.

In today's society, the concept of green and healthy has penetrated into the hearts of every consumer. People pay attention to environmental protection and pay attention to their own health. When purchasing any products, they also put environmental protection and safety in the first place. In our living space, viruses and bacteria are everywhere and there is no ubiquity. The existence of viral bacteria on the human body The degree of harm has always plagued and threatened everyone's physical and mental health, and some handicrafts, especially bamboo and wood crafts, are particularly prone to mold and bacteria because they contain relatively large amounts of water, which affects the quality of the crafts and also transmits mold bacteria to humans. People with low immunity are prone to illness after contact, which seriously affects people's health.

The silver ion series sterilization powder is commonly used in the international coatings industry. Although the test proves that the silver ion sterilization powder has a good antibacterial and antibacterial effect, according to a study by Seoul Hanlian, the human body has long been exposed to the nano silver. It causes certain damage to the body. It is especially confirmed that if people accidentally eat nano-silver particles, it will cause serious harm to the human liver. Therefore, especially for indoor decoration of infants and children activities and contact, it is not allowed to use nano-containing The silver series powder is added as a bactericidal antibacterial additive to the bactericidal antibacterial coating.

In recent years, the application of plant sterilization and mildew in paints has achieved certain research results. For example, Chinese Patent No. CN 104194514A discloses a mildew-proof, bactericidal, formaldehyde-removing coating. Including the following raw materials by weight: 2~5 parts of nano silver solution, 10~15 parts of filler calcium carbonate, 8~12 parts of stabilizer propylene glycol, 18~25 parts of styrene-acrylic emulsion, filming aid dodecyl carbonate 2~5 parts, plant extract 8~12 parts, water 10~45 parts, pH regulator 1~3 parts, the plant extract is tea, scutellaria and medlar with concentration of 8~12 parts 2.5g/ml Rice extract. Chinese Patent No. CN 106590308A discloses an anti-mold and antibacterial coating comprising pure acrylic emulsion, acrylonitrile, copper sulfate, bactericide, plant cellulose, sodium sulfate, mildewproof agent, water, and the quality fraction of each component. It is: pure acrylic emulsion 30-60, acrylonitrile 20-50, copper sulfate 20-30, fungicide 10-20, plant cellulose 15-20, sodium sulfate 20-40, mildew inhibitor 30-60, water 50- 70. Chinese Patent No. CN 106221557A discloses a bactericidal functional coating comprising, according to parts by weight, 70-100 parts of urethane acrylate resin, 5-10 parts of calcined kaolin, 1-5 parts of quartz sand, titanium 1-5 parts of white powder, 1-5 parts of antifoaming agent, 1-10 parts of vegetable fungicide, 1-10 parts of preservative, 1.5-5 parts of film forming aid, 1-5 parts thickener, wetting and dispersing agent 10-20 parts and 10-30 parts of water.

The above patents technically introduce plant components as the main fungicide, but have not been thoroughly studied on how to further improve the sterilization effect of plant components. Chinese Patent No. CN 105199462A discloses a plant sterilization and insect repellent functional interior wall latex paint and a preparation method thereof, comprising the following components by weight: 120-150 parts of polymer emulsion, 3-5 parts of hydroxyethyl cellulose, 2-5 parts of plant-based composite nano-bacterial powder, 15-25 parts of antifreeze, 7-28 parts of film-forming auxiliary, 3-6 parts of thickener, 3-5 parts of leveling agent, 180-220 parts of filler, 350-450 parts of water, wherein the component plant-based composite nano-bacterial powder is prepared by infrared dehydration technology and nano production technology by cheap and easily available purslane, pine needle, camphor tree, oriental arborvitae and cedar. Although it has introduced infrared dehydration technology and nano production technology, there is no in-depth study on the persistence of sterilization effect.

The object of the present invention is to provide a microcapsule sterilization and anti-mold coating for plant essential oil, which can be applied to the sterilization and mildew of handicrafts, and prolongs the timeliness of sterilization and mildew-proofing effects.

Another object of the present invention is to provide a method for preparing a plant essential oil microcapsule sterilization and mildewproof coating, which has simple processing technology and can be mass-produced industrially.

Still another object of the present invention is to provide a plant essential oil microcapsule sterilization and mildewproof coating for use in handicrafts.

The invention provides a plant essential oil microcapsule sterilization antifungal coating comprising the following components by weight: 120-150 parts by weight of polymer emulsion, 3-5 parts by weight of hydroxyethyl cellulose, 350-450 parts by weight of purified water, filler 180-220 parts by weight, 12-120 parts by weight of nano pigment, 10-20 parts by weight of plant essential oil microcapsules, and 7-48 parts by weight of functional auxiliary; wherein the plant essential oil microcapsule is a microcapsule of citron plant essential oil, Prepared by the following steps: Step 1, infrared radiation dehydration: fresh leaves, branches and roots of camphor tree are washed and sliced and then rapidly dehydrated and dried by infrared radiation heating; Step 2, nano grinding and crushing: grinding by nano grinding The pulverization is carried out to obtain a nano citron powder having a nanometer-sized particle diameter; in step 3, boiling water distillation: the nano citron powder is added to boiling water for steam distillation, and the liquid-solid ratio is controlled to be 1.8-2.2 g/mL; and step 4, diethyl ether extraction: The distillate is extracted with diethyl ether several times, and the volume ratio of distillate to diethyl ether is controlled to be 1:1-2. The ether is recovered by water bath and dehydrated to obtain essential oil of camphor plant; step 5, ultrasonic embedding: under ultrasound Control fiber The weight ratio of pigment to water is 1: 40-49, hydroxyethylcellulose oil was dissolved in water to prepare a wall material; at a temperature of 45-55 deg.] C, the control camphor essential oils And the quality of the wall material of the essential oil m, plant essential oil: wall material m = 1:5-5.5 under the condition of ultrasonic embedding for 60min, standing, suction filtration, drying, crushing to obtain the essential oil microcapsules of camphor plant.

Preferably, the polymer emulsion is a styrene-acrylic polymer emulsion and/or a pure propylene polymer emulsion.

Preferably, the hydroxyethyl cellulose is used after alkali treatment of cotton hydroxyethyl cellulose. Prepared by etherification reaction with ethylene oxide or chlorohydrin.

Preferably, the filler may be any one of light calcium carbonate, heavy calcium carbonate, talc, and the like.

Preferably, the nano pigment is nano titanium dioxide, nano organic yellow pulp or nano organic large red pulp, and the corresponding weight ratio is nano titanium powder 80-120, nano organic Yellow pulp 12-15, or nano organic large red pulp 12-15. Among them, the addition of nano titanium dioxide forms a white plant essential oil microcapsule sterilization anti-mold coating, adding yellow organic yellow crystals to form a yellow plant essential oil microcapsule sterilization anti-mold coating, adding nano organic red pulp to form a red Plant essential oil microcapsules bactericidal mildew coating.

Preferably, the functional auxiliary agent may be one or more of an antifreeze agent, a leveling agent, a film forming aid, a thickener, an antifoaming agent, a pH adjusting agent, a wetting agent, and a dispersing agent.

The invention also provides a preparation method of a plant essential oil microcapsule sterilization antifungal coating, comprising the steps of preparing a plant essential oil microcapsule and preparing a sterilization antifungal coating, wherein the step of preparing the plant essential oil microcapsule comprises: Step 1, infrared radiation dehydration: fresh leaves, branches and roots of camphor tree are washed and sliced, and then rapidly dehydrated and dried by infrared radiation heating; Step 2, nano grinding and pulverizing: grinding and pulverizing by nano grinding production to obtain nano citron powder having a nanometer particle size; step 3, boiling water distillation: nano citron powder is added to boiling water for steam distillation, control liquid The solid ratio is 1.8-2.2g/mL; step 4, diethyl ether extraction: the distillate is extracted with diethyl ether several times, the volume ratio of distillate to diethyl ether is controlled to be 1:1-2, and the ether is recovered by water bath and dehydrated. Obtained essential oil of camphor plant; step 5, ultrasonic embedding: controlling the weight ratio of cellulose to water by ultrasonic: 1:40-49, dissolving hydroxyethyl cellulose in water to obtain essential oil wall material; at temperature 45- Under 55 °C, control the quality ratio of essential oil and essential oil wall material of camphor plant, plant essential oil: wall material m=1:5-5.5 under ultrasonic conditions for 60 min, static, suction filtration, drying, crushing to obtain camphor plants The essential oil microcapsules; wherein the step of preparing the bactericidal anti-mold coating comprises: mixing, grinding and adjusting the raw materials of the components according to a ratio, thereby obtaining a microcapsule sterilization and anti-mold coating of the plant essential oil.

The invention provides the application of the above plant essential oil microcapsule sterilization and mildewproof paint in handicrafts.

The beneficial effects of the invention are:

1. The added microbial bactericidal oil microcapsules are green and environmentally friendly. They are derived from nature, are renewable resources, have a wide range of sources, do not contain all kinds of harmful substances to human body, and have long-acting broad-spectrum sterilization, antibacterial and anti-mildew functions. Environmental sustainability; the bactericidal active ingredient in microbial capsules of plant bactericidal oil can reduce the influence of the external environment, has a slow release effect, prolongs the timeliness of bactericidal and antifungal effects, and has an antibacterial and antifungal durability of more than 10 years.

2, through the authoritative cooperation manufacturers to test, added plant bactericidal oil microcapsules of handicraft paint; its bactericidal antibacterial and mildew resistance and exceeds the industry standard HG/T3950-2007 antibacterial coating 99% of the grade I reached 100%; the durability of the antibacterial and mildew resistance reached and exceeded the industry standard HG/T3950-2007 antibacterial coating, 95% of the grade I, reached 100%, and the antifungal durability reached more than 10 years.

3. Formulation design does not add co-solvent containing volatile organic compounds, and adopts organic environmentally-friendly color paste and pigment. It does not contain heavy metals harmful to human body. The product can achieve ultra-low VOC and has good environmental protection.

The invention will be further clarified by the following examples of the invention and the comparative examples thereof, but they are not intended to limit the invention. Portions of the specific embodiments and comparative examples that are not described in detail are obtained using prior art, well-known technical means, and industry standards.

The percentages used in the present invention are by weight unless otherwise indicated.

Example 1

This embodiment is a white plant essential oil microcapsule sterilization and mildewproof coating, and its composition and weight ratio are: 4 parts by weight of hydroxyethyl cellulose; 450 parts by weight of purified water; 48 parts by weight of functional auxiliary; 10 parts by weight of microbial capsules of plant bactericidal essential oil; 100 parts by weight of nano titanium dioxide; 180 parts by weight of filler; 140 parts by weight.

Preparation methods include:

(1) The fresh leaves, branches and roots of the camphor tree are washed and sliced, then rapidly dehydrated and dried by infrared radiation heating, and ground and pulverized by nano-grinding production technology to finally obtain nano-scented powder with nanometer-sized particle size;

(2) Accurately weigh 500g of the above-mentioned nano citron powder in a 2000mL flask, add 1000mL of boiling water (guaranteed liquid-solid ratio of about 2g/mL) for steam distillation, collect the distillate, and extract the distillate with ether for 3 times ( The volume ratio of the distillate to the ether is 1:1), the ether is removed and removed in a water bath at 55 ° C, and finally, an appropriate amount of anhydrous sodium sulfate is added to dehydrate the essential oil of the camphor plant;

(3) The hydroxyethyl cellulose is dissolved in water to obtain the essential oil wall material (weight ratio of cellulose to water is 1:40-49). Ultrasonic power is 200W to form a colorless transparent colloid at a temperature of 50 °C. , m essential oil: m wall material = 1: 5.5 under ultrasonic conditions for 60min, placed in a 4-5 ° C refrigerator for 12h, suction filtration to obtain a white powder, placed in a 60 ° C drying oven for 5h, using nano-grinding technology, 10-20um plant sterilization essential oil microcapsules.

(4) hydroxyethyl cellulose, purified water, antifreeze in functional additives, antifoaming agent, wetting and dispersing agent, nano titanium dioxide, plant sterilization essential oil microcapsules, fillers, and then into the container for high-speed mixing 1200 ~1400 rpm, stir evenly, grind on a horizontal sander, grind to fineness After 30μm, transfer to the mixing vessel and reduce the rotation speed to 800 rpm. Add the filming aid, leveling agent, pH adjuster, and thickener to the polymer emulsion and other functional additives to adjust the viscosity to 90±2KU. (25 ° C), after weighing and packaging.

Wherein, the antifoaming agent is preferably BYK-022 of BYK Chemical, the antifoaming agent is an organic antimony defoaming agent for waterborne coatings, has no influence on color acceptability and gloss, and needs high enough shear force when added. To avoid shrinkage cavities, this defoamer has excellent long-term stability and is extremely effective against microbubbles. It is VOC-free and highly environmentally friendly. The wetting agent dispersant is BYK-192 produced by BYK Chemical. The emulsification The agent is polyvinyl alcohol; the antifreeze agent is preferably propylene glycol, which is environmentally friendly and cost-effective. The leveling agent is preferably BYK-375 of BYK Chemical, which is particularly suitable for use in aqueous systems with low co-solvent content and has good compatibility with these systems. It is suitable for cross-linking system by reacting its primary hydroxyl group with the base material. The leveling agent can improve slipperiness, solvent resistance, weather resistance and less dust accumulation. Compared with the standard non-reactive organic hydrazine, the auxiliaries are more durable in the coating system due to the crosslinking of the reactive groups with the paint film, which significantly reduces the surface tension and enhances the wetting of the substrate. Flow and level and prevent the formation of the Bernard vortex. The thickener is a 2020 NPR non-ionic polyurethane association type produced by Rohm and Haas Company, which provides efficient medium shear thickening, promotes flow leveling, and provides good film fullness.

(5) Detection - filtration - packaging - sample retention.

Example 2

This embodiment is a yellow plant essential oil microcapsule sterilization anti-mold coating, the composition and weight ratio is: 3 parts by weight of hydroxyethyl cellulose; 400 parts by weight of purified water; 42.5 parts by weight of functional auxiliary; 15 parts by weight of microbial capsules of plant bactericidal oil; 220 parts by weight of filler; 130 parts by weight of polymer pure acrylic emulsion; Yellow pulp was 15 parts by weight.

The preparation method comprises the following:

(1) The fresh leaves, branches and roots of the camphor tree are washed and sliced, then rapidly dehydrated and dried by infrared radiation heating, and ground and pulverized by nano-grinding production technology to finally obtain nano-scented powder with nanometer-sized particle size;

(2) Accurately weigh 500g of the above-mentioned nano citron powder in a 2000mL flask, add 1000mL of boiling water (guarantee liquid-solid ratio of about 2g/mL) for steam distillation, collect the distillate, and use diethyl ether to enter The extract distillate was extracted three times (the ratio of distillate to diethyl ether was 1:1), and the ether was removed and removed in a water bath at 55 ° C. Finally, an appropriate amount of anhydrous sodium sulfate was added to dehydrate the essential oil of the camphor plant;

(3) The hydroxyethyl cellulose is dissolved in water to obtain the essential oil wall material (weight ratio of cellulose to water is 1:40-49). Ultrasonic power is 200W to form a colorless transparent colloid at a temperature of 50 °C. , m essential oil: m wall material = 1: 5.5 under ultrasonic conditions for 60min, placed in a 4-5 ° C refrigerator for 12h, suction filtration to obtain a white powder, placed in a 60 ° C drying oven for 5h, using nano-grinding technology, 10-20um plant sterilization essential oil microcapsules.

(4) Antifreeze, antifoaming agent, wetting and dispersing agent in hydroxyethyl cellulose, purified water, functional additives, yellow color paddle in nano organic, microcapsules and fillers of plant sterilization essential oil Stir the vessel at a high speed of 1200~1400 rpm, stir it evenly, then grind it on a horizontal sander and grind it to fineness. After 30μm, the rotation speed is reduced to 800 rpm, and the filming aid, leveling agent, pH adjuster, and thickener added to the polymer emulsion and other functional additives are added to adjust the viscosity to 90±. 2KU (25 ° C), after weighing and packaging.

(5) Detection - filtration - packaging - sample retention.

Example 3

The red plant essential oil microcapsule sterilization anti-mold coating of the present embodiment has a composition and weight ratio of: 3 parts by weight of hydroxyethyl cellulose; 400 parts by weight of purified water; 44 parts by weight of functional auxiliary; 20 parts by weight of microbial capsules of plant bactericidal essential oil; 130 parts by weight of filler: 120 parts by weight of polymer pure acrylic emulsion; The slurry was 15 parts by weight.

The preparation method comprises the following:

(1) The fresh leaves, branches and roots of the camphor tree are washed and sliced, then rapidly dehydrated and dried by infrared radiation heating, and ground and pulverized by nano-grinding production technology to finally obtain nano-scented powder with nanometer-sized particle size;

(2) Accurately weigh 500g of the above-mentioned nano citron powder in a 2000mL flask, add 1000mL of boiling water (guaranteed liquid-solid ratio of about 2g/mL) for steam distillation, collect the distillate, and extract the distillate with ether for 3 times ( The volume ratio of the distillate to the ether is 1:1), the ether is removed and removed in a water bath at 55 ° C, and finally, an appropriate amount of anhydrous sodium sulfate is added to dehydrate the essential oil of the camphor plant;

(3) The hydroxyethyl cellulose is dissolved in water to obtain the essential oil wall material (weight ratio of cellulose to water is 1:40-49). Ultrasonic power is 200W to form a colorless transparent colloid at a temperature of 50 °C. , m essential oil: m wall material = 1: 5.5 under ultrasonic conditions for 60min, placed in a 4-5 ° C refrigerator for 12h, suction filtration to obtain a white powder, placed in a 60 ° C drying oven for 5h, using nano-grinding technology, 10-20um plant sterilization essential oil microcapsules.

(4) hydroxyethyl cellulose, purified water, antifreeze in functional additives, antifoaming agent, wetting and dispersing agent, nano organic large red paddle, plant sterilization essential oil microcapsules, filler, and then into the container Mix 1200~1400 rpm at high speed, stir evenly, grind on the horizontal sander, grind to fineness After 30μm, transfer to the mixing vessel and reduce the rotation speed to 800 rpm. Add the filming aid, leveling agent, pH adjuster, and thickener to the polymer emulsion and other functional additives to adjust the viscosity to 90±2KU. (25 ° C), after weighing and packaging.

(5) Detection - filtration - packaging - sample retention.

Comparative example 1

This comparison example mainly refers to the formulation and preparation method of Chinese Patent No. CN 105199462A: Formulation: 140 parts of polymer emulsion, 4 parts of hydroxyethyl cellulose, 3 parts of phytochemical composite nano-bacterial powder (nano-purslan powder: nano citron tree powder: nano cedar powder: nano pine needle powder: nano Platycladus orientalis powder = 3:2:1:3:1, particle size of 50 nm) 120 parts of nano titanium dioxide, 20 parts of antifreeze, 7 parts of filming aid, 3 parts of thickener, leveling agent 4 Parts, 180 parts of filler, 450 parts of purified water.

Preparation method: Washing and slicing fresh leaves, branches and roots such as purslane, pine needles, camphor tree, arborvitae powder and cedar, and then rapidly dehydrating and drying by infrared radiation heating, then grinding and pulverizing by nano-grinding and grinding equipment, and finally Nano-toothed glutinous rice powder having nanometer-sized particle size, nano pine needle powder, nano citron tree powder, nano arborvitae powder and nano cedar powder were obtained.

According to the weight of the formula, the raw materials are used, and hydroxyethyl cellulose, purified water, auxiliary agent, antifreeze, titanium dioxide, and vegetable nano-bacterial powder are pressed (nanopurine powder: nano citron tree powder: nano Cedar powder: nano pine needle powder: nano arborvitae powder = 3:2:1:3:1, particle size of 50 nm) mixing ratio, filler, and then into the container, high-speed stirring 1400 ~ 1600 rpm, After mixing evenly, grinding on a horizontal sander, grinding to fineness After 30μm, it is transferred to the mixing vessel, the rotation speed is reduced to 800 rpm, polymer emulsion, filming aid, leveling agent is added, and the thickener is added to adjust the viscosity to the customer.

Detection - filtration - packaging - sample retention.

The above-mentioned examples and comparative examples of the plant essential oil microcapsule sterilization antifungal coating, according to the Chinese mainland standard GB/T 9755-2014 "synthetic resin emulsion exterior wall coating" to achieve superior product testing requirements, the test results are attached to Table 1.

Table 1 Example Test Data Sheet

The above disclosure is only the preferred embodiment of the present invention, and the equivalent scope of the present invention is not limited thereto, and the equivalent changes made by the scope of the present invention remain within the scope of the present invention.

Claims (9)

A plant essential oil microcapsule sterilization antifungal coating comprising the following components by weight: 120-150 parts by weight of polymer emulsion, 3-5 parts by weight of hydroxyethyl cellulose, 350-450 parts by weight of purified water, filler 180- 220 parts by weight, 12-120 parts by weight of nano pigment, 10-20 parts by weight of plant essential oil microcapsules, and 7-28 parts by weight of functional auxiliary; wherein the plant essential oil microcapsule is a citron plant essential oil microcapsule, as follows The preparation step is as follows: Step 1: Infrared radiation dehydration: fresh leaves, branches or roots of a camphor tree are washed and sliced, and then rapidly dehydrated and dried by infrared radiation heating; Step 2, nano grinding and crushing: grinding by nano grinding production Crushing to obtain a nanometer citron powder having a nanometer particle size; step 3, boiling water distillation: the nano citron powder is added to boiling water for steam distillation, and the liquid to solid ratio is controlled to be 1.8-2.2 g/mL; step 4, diethyl ether Extraction: the distillate is extracted with diethyl ether several times, the volume ratio of distillate to diethyl ether is controlled to be 1:1-2, the ether is recovered in a water bath and dehydrated to obtain a citron plant essential oil; and step 5, ultrasonic package Buried: under ultrasound The weight ratio of cellulose to water is 1:40-49, the hydroxyethyl cellulose is dissolved in water to obtain the essential oil wall material; at the temperature of 45-55 ° C, the essential oil of the citron plant and the wall material of an essential oil are controlled. Quality ratio m, plant essential oil: wall material m = 1:5-5.5 conditions under ultrasound entrapment for 60min, standing, suction filtration, drying and pulverization to obtain a fragrant plant essential oil microcapsules. The plant essential oil microcapsule sterilization antifungal coating according to claim 1, wherein the polymer emulsion is a styrene-acrylic polymer emulsion and/or a pure propylene polymer emulsion. The plant essential oil microcapsule sterilization antifungal coating according to the first aspect of the invention, wherein the hydroxyethyl cellulose is hydroxyethyl cellulose treated with alkali, with ethylene oxide or chlorine The alcohol is obtained by an etherification reaction. The plant essential oil microcapsule sterilizing and antifungal coating according to the above aspect of the invention, wherein the filler is any one or more of light calcium carbonate, heavy calcium carbonate and talc. The plant essential oil microcapsule sterilization antifungal coating according to the first aspect of the invention, wherein the nano pigment is nano titanium white powder, nano organic yellow pulp or nano organic red, wherein nano titanium dioxide is added. It forms a white plant essential oil microcapsule bactericidal anti-mold coating, adding nano organic pulp to form a yellow plant essential oil microcapsule sterilization anti-mold coating, adding nano organic red to form a red plant essential oil microcapsule sterilization anti-mold coating . The micro-capsule sterilization and anti-mold coating of the plant essential oil as described in claim 5, wherein the nano-pigment corresponding to the weight ratio is nano-titanium powder 80-120, nano-organic yellow pulp 12-20, Or nano organic red 12-20. The plant essential oil microcapsule sterilization antifungal coating according to the first aspect of the invention, wherein the functional auxiliary agent is an antifreeze agent, a leveling agent, a film forming agent, a thickener, an antifoaming agent, a pH adjusting agent, and a moisturizing agent. Any one or more of a wet agent and a dispersant. The invention relates to a preparation method of a plant essential oil microcapsule sterilization anti-mold coating, comprising the steps of preparing a plant essential oil microcapsule and preparing a sterilization anti-mold coating, wherein the step of preparing the plant essential oil microcapsule comprises: step 1, infrared radiation dehydration: a camphor tree Fresh leaves, branches or roots are washed and sliced and then rapidly dehydrated and dried by infrared radiation heating; Step 2, nano grinding and pulverization: grinding and pulverizing by nano-milling to obtain a nano-sized citron powder with nanometer-size particle size Step 3, boiling water distillation: the nano citron powder is added to boiling water for steam distillation, and the liquid-solid ratio is controlled to be 1.8-2.2 g/mL; Step 4, extracting with diethyl ether: extracting the distillate with diethyl ether several times, controlling the volume ratio of the distillate to diethyl ether to be 1:1-2, recovering the ether in a water bath and dehydrating to obtain a citron plant essential oil; 5, ultrasonic embedding: ultrasonic control of cellulose to water weight ratio of 1:40-49, hydroxyethyl cellulose dissolved in water to obtain essential oil wall material; at a temperature of 45-55 ° C, control citron plants The quality ratio of essential oil and essential oil wall material is m, plant essential oil: wall material m=1:5-5.5 under ultrasonic conditions for 60 min, static standing, suction filtration, drying and pulverization to obtain a fragrant plant essential oil microcapsule; The step of sterilizing and anti-mold coating comprises: mixing, grinding and adjusting the raw materials of the components according to the ratio, that is, obtaining a microcapsule sterilization and anti-mold coating of the plant essential oil, wherein the component comprises: a polymer emulsion and a hydroxyethyl fiber. , pure water, fillers, nano pigments, plant essential oil microcapsules and functional additives. A plant essential oil microcapsule bactericidal antifungal coating according to any one of claims 1 to 7 for use in a handicraft.