TWI596171B - Plant antiseptic deworm-functional water-based wood paint and its preparation method - Google Patents

Description

Plant sterilization and deworming functional type waterborne wood lacquer and preparation method thereof

The invention relates to the technical field of waterborne wood lacquers, in particular to a waterborne wood lacquer for sterilizing and deworming functions of plants and a preparation method thereof.

Viruses and bacteria are everywhere in our living environment. They pose a threat to human health. In addition, pests such as mosquitoes, flies, cockroaches, fleas, bedbugs and cockroaches can spread diseases and affect people's health. In this regard, human beings are constantly developing sterilization and deworming technology. For example, there is a technical branch of bactericidal coatings in the coatings industry.

The antibacterial agent in the antibacterial polyurethane material is usually an inorganic antibacterial agent such as silver ion, an organic antibacterial agent such as a quaternary ammonium salt type antibacterial agent, a natural antibacterial agent such as chitosan and a derivative thereof, sorbic acid or the like. Although the silver ion bactericide has strong bactericidal, antibacterial and antifungal ability, studies have shown that long-term exposure to nano-silver can cause certain damage to the body. If you accidentally eat nano-silver particles, it will cause serious harm to the human liver. Therefore, water-based wood lacquers are not suitable for use with nano-silver ion bactericides for interior decoration and furniture that are in contact with infants and young children. The quaternary ammonium salt-based antibacterial agent also has certain toxicity, and the sterilization ability of chitosan and its derivatives, sorbic acid, etc. is not strong enough, and it is not recommended to be added to the coating.

Patent CN104194514A is made of nano-silver aqueous solution, plants such as tea, scutellaria, glutinous rice extract, styrene-acrylic emulsion, etc. to make mold and bactericidal paint. However, as mentioned above, nano silver may cause a certain degree of physical damage. . CN104449279A uses modified aqueous vegetable oil alkyd resin and phenolic resin as film-forming resin, and natural antibacterial acaricidal ingredients such as nano bamboo fiber, aloe oil and eucalyptus oil are added. Finally, the glass door is made of water-based paint, but aloe oil, eucalyptus oil and the like are easily volatilized, and the antibacterial ability of the paint does not last. The waterproof antibacterial coating disclosed in CN104004427A comprises a polyacrylate emulsion, a polyurethane emulsion, a bacteriostatic agent such as an isothiazolinone, a benzisothiazolinone, a formaldehyde releasing agent, etc., and the coating is insufficient in safety and environmental protection. The insect repellent component in the insect repellent wood lacquer disclosed in CN104017405A includes night primrose, lavender, pitcher plant, geranium, thyme, marigold, fly ash, etc., but the composition of the wood lacquer is not specifically described, and the wood lacquer There is almost no bactericidal and antibacterial properties.

Therefore, there is an urgent need for a high-performance water-based wood lacquer that is safe, environmentally friendly, has minimal damage to human health, and is highly effective and durable in sterilizing, antibacterial and deworming. The paint does not affect human health, and it can effectively and effectively sterilize and deworm.

An object of the present invention is to provide a plant bactericidal and insect repellent functional waterborne wood lacquer comprising an aliphatic modified polyurethane dispersion, a vegetable composite nano bactericidal powder and a hardening resin. The wood paint is safe, environmentally friendly, efficient and durable, antibacterial and insect repellent.

Another object of the present invention is to provide a method for preparing a plant-based insect repellent functional waterborne wood lacquer. The preparation method is simple in operation and can be industrially produced.

The invention provides a plant bactericidal and insect repellent functional water-based wood lacquer, which comprises the following components by weight: 60-85 parts of aliphatic modified polyurethane dispersion, 0.3-0.8 parts of vegetable composite nano bactericide powder, hardening resin 1-3 parts, 7-12 parts of water, 1-3 parts of wax emulsion, 4-12 parts of other auxiliaries.

Preferably, the aliphatic modified polyurethane dispersion is synthesized by a prepolymer mixing method using vegetable oil, isophorone diisocyanate, polyether diol, and aminopropyl triethoxy decane as raw materials. It is a new type of aliphatic waterborne polyurethane varnish. Among them, the vegetable oil is preferably castor oil (CO).

More preferably, the proportion by weight of each raw material is as follows: castor oil (CO) 95-96.4 parts, different Buddha 0.5-0.8 parts of ketone diisocyanate, 1-1.2 parts of polyether diol, and 0.2-0.5 parts of aminopropyl triethoxy decane.

Since the raw material contains aminopropyltriethoxysilane, the above aliphatic modified polyurethane is a polyoxyalkylene-polyurethane block copolymer synthesized by using polyoxyalkylene as a soft segment, and has both polyoxane and The excellent properties of both polyurethanes show good low temperature flexibility, dielectric properties, surface enrichment and excellent biocompatibility, which can overcome the shortcomings of poor mechanical properties of polyoxyalkylene oxides and also compensate for the poor weatherability of polyurethanes. Insufficient. In addition, the castor oil in the raw material is a vegetable oil, which is a renewable resource with a wide range of sources, low price, easy to obtain and purchase, and which can significantly improve the gloss of the material.

The aforementioned prepolymer mixing method is actually a prepolymer-ionomer mixing method. The preparation method comprises the steps of preparing a prepolymer having a hydrophilic group and containing a -NCO end group, and after being dispersed in low temperature water, the chain is extended by a diamine or a glycol, and when the viscosity of the prepolymer is high, the method can be appropriately added. A small amount of solvent makes the prepolymer easy to stir and disperse at around 40 °C. The advantage is that the preparation method is simple, and an emulsion containing an emulsified macromolecule can be obtained. For example, a polyurethane dispersion is synthesized using N-methyldiethanolamine and dimethylolpropionic acid (DMPA). The carboxylic acid on DMPA reacts slowly with the isocyanate group due to steric hindrance, and the carboxylic acid group is neutralized with an amine. Dilution with water to obtain an aqueous dispersion, followed by chain extension, but the viscosity must be strictly controlled during the subsequent chain extension, otherwise the dispersion is difficult or even impossible to disperse. In order to further improve the performance, a crosslinking agent such as melamine resin is added.

The aliphatic modified polyurethane dispersion is a binary colloidal system with water as a medium, and its particle size is less than 0.1 nm, which has good dispersion stability, and not only retains the excellent drying performance of the conventional solvent-based polyurethane, but also It also has low production cost, no pollution to the environment, easy operation, good transparency, and good environmental protection. The water-based aliphatic modified polyurethane dispersion coating film has the advantages of high hardness, strong adhesion, corrosion resistance and good solvent resistance, and is in line with the “three premise” (resources, energy, pollution-free) and “four E principles” of developing coatings ( The era requirements of economic economy, efficiency EFFICIENCY, ecological ECOLOGY, energy ENERGY).

For the vegetal composite nano bactericidal powder, preferably, it contains nano dentate powder, nai One or more of rice eucalyptus powder, nano cedar powder, nano pine needle powder, and nano arborvitae powder are prepared by the corresponding plants by infrared radiation dehydration technology and nano production technology.

More preferably, the proportion of the raw materials in the water-soluble composite nano anion powder is nanometer dentate powder: nano citron tree powder: nano cedar powder: nano pine needle powder: nano arborvitae powder=1 -5: 1-3: 0-3: 1-3: 0-2; the nano powder has a particle diameter of 40 to 100 nm.

Purslane is widely found in China. It has many functions: it can deworm at home, and it can clear away heat and detoxify, replenish qi and tonic, and can be used to treat various diseases. The alcohol extract in Portulaca oleracea has a high inhibitory effect on Escherichia coli, Proteus, Shigella, Typhoid, and Paratyphoid bacillus, and has different degrees of Staphylococcus aureus, fungi such as A. sinensis and Mycobacterium tuberculosis. The inhibitory effect can be used for the adjuvant treatment of various inflammations, and is known as the "natural antibiotic".

Pine needles, modern medical research shows that there are 65 components in fresh pine needles, the main components are alkane, enoic acid, ketene, sterols, and dry pine needles have 44 components, the main components are alkanoic acid, ketone Classes, esters and sterols, in which the content of sterols is relatively high. The form of the components in the dry pine needle is relatively stable. The volatile oil of pine needle has the functions of phlegm, stomach, wind, antipyretic, diuretic, analgesic, deworming, antibacterial, antiviral, etc. It can cure chronic infection of upper respiratory tract. At the same time, pine needle powder contains phytoncide and vitamins. The effect of disease resistance, can effectively resist the occurrence of human diseases.

The plants of the camphor tree all have camphor aroma, which can be used to extract camphor and oyster sauce. Toona sinensis is resistant to harmful gases such as chlorine, sulfur dioxide, ozone and fluorine. Its special fragrance can effectively repel mosquitoes and deworm. The leaves, branches, bark, roots and other volatile oils of camphor tree contain the essential components of camphor (54.54%), as well as 1,8-eucalyptol and a small amount of α-terpineol, β-pinene, α- Terpene, geranyl aldehyde, α-phellandene, decene, dragon and nerol. According to "Luchuan Materia Medica", the leaves, branches, bark and roots of camphor trees have the functions of killing insects, sterilizing and treating phlegm.

The leaves and branches of Platycladus orientalis can be used to stagnate hemostasis, diuretic and stomach, detoxification and dispersal; Relieve, nourish and strengthen the effect. Platycladus essential oil has antibacterial, anti-inflammatory, astringent, diuretic, soft, phlegm, fungicidal and other effects.

Cedar wood contains very rich essential oils. The main components of cedar oil include A-Cedrene, B-Cedrene, Thujopsene, Sesquiterpenes, Cedar alcohol and Wad alcohol. Cedar oil has the medical effects of anti-lipid, anti-corrosion, sterilization, tonic, astringent, diuretic, menstruation, wart, insecticide and calming.

Plant essential oils or plant extracts have a certain volatility. If they are dropped on the surface of the object, they can be volatilized within 24-48 hours and cannot be kept persistent. Therefore, how to ensure the efficacy level of bactericidal, antibacterial, mildew and insect repellent of essential oils and extracts, and to ensure the durability of these properties is critical.

After some practice and exploration, it was found that the infrared dehydration technology can be used to wash the fresh leaves and branches of the above plants, and then rapidly dehydrated and dried by infrared radiation heating, which can quickly reduce the moisture contained in the leaves and branches. The effect of the loss of various essential oils and active ingredients in the leaves and branches of the plants is small. Infrared radiation dehydration technology is beneficial to the essential oil and active ingredients remaining in the leaves, branches and roots of the plant, and then ground and pulverized by nano-grinding and grinding equipment to finally obtain nano-purin powder with nanometer size. Nano pine needle powder, nano citron tree powder, nano arborvitae powder and nano cedar powder. Two or more of these nano-grade plant sterilization and deworming powders are mixed in a certain proportion, and the plant-based composite nano-bacterial powder is added to the coating, so that the coating has high-efficiency and continuous sterilization, antibacterial and anti-mildew. , deworming effect.

The above-mentioned plants with sterilization, antibacterial, deworming and antisepsis are abundant in various parts of China, and are abundant in Guangxi, Jiangxi, Fujian, Taiwan, Hunan, Hubei, Sichuan, Yunnan and other places, and many places in China have artificial cultivation. Renewable resources are widely available, easy to obtain and purchase, and there are no shortages of materials and difficulties in obtaining and purchasing, and the cost is relatively low.

The water-based wood lacquer of the invention adds the plant-based composite nano-bacterial powder prepared by the combination of the infrared dehydration technology and the nano-production technology, and the bactericidal, antibacterial and anti-mildew properties can exceed the industry standard. HG/T3950-2007 antibacterial coatings in Class I 99%; antibacterial and mildew durability also exceeds industry standard HG/T3950-2007 antibacterial coatings in Class I 95%.

Preferably, the hardening resin of the present invention is a solventless aqueous modified aldehyde ketone resin dispersion. It is synthesized by prepolymer method with aldehyde and ketone resin, hydrophilic monomer dimethylolbutanoic acid and dihydroxy polyoxyethylene ether, polyadipate neopentyl glycol ester and isophorone diisocyanate as main raw materials. Modified aldehyde ketone resin dispersion.

More preferably, the proportion by weight of each raw material is as follows: 96-98 parts of aldehyde and ketone resin, 0.5-1 part of hydrophilic monomer dimethylolbutanoic acid, 0.5-1 part of dihydroxy polyoxyethylene ether, and polypentylene adipate The diol ester is 0.2-0.7 parts, and the isophorone diisocyanate is 1-1.5 parts.

The water-based aldehyde and ketone resin has better gloss, high hardness, anti-blocking property, dryness, transparency, chemical resistance, pollution resistance and water solubility, and has excellent stability and moisture. Wetness and color development. Due to its good finishing properties, the hardening resin can also be used to increase the pigmenting power of the pigment, so that even at high concentrations of colored wood lacquer pigments, a very high gloss can be obtained.

Studies have shown that the polyurethane dispersion PUD has a zeta potential greater than -30 mV, and has good emulsion stability. The anionic/nonionic PUD has lower surface tension and better calcium ion stability. The increase of the hydrophilic group content (HGC), the reduction of the anion/nonionic molar ratio, the amount of the aldehyde ketone resin, and the NCO/OH molar ratio decrease the average particle size of the micelle and increase the viscosity of the emulsion. The aldehyde-ketone resin modified PUD particle size showed a bimodal distribution, and transmission electron microscopy showed that the dispersion colloidal particles showed a spherical structure. After the PUD is modified by the aldehyde ketone resin, the pencil hardness of the corresponding coating film is improved, and the coating film has more excellent adhesion, flexibility and water resistance.

Preferably, the water in the raw material is deionized water, and the tap water contains more impurities due to the addition of bleaching powder, etc., which may result in poor storage stability of the waterborne wood lacquer product.

Preferably, the wax emulsion in the raw material is a water-based wax additive imported from Germany, preferably a ULTRALUTE® D-816 water-based wax additive manufactured by Keim-Attitec, Germany, which can enhance the smoothness and anti-caking of the product. Resistance to friction, water resistance, scratch resistance, etc.

More preferably, in order to make the overall performance of the wood lacquer more excellent, the aforementioned other auxiliaries include 2-5 parts of the film forming aid, 0.2-0.7 parts of the wetting and dispersing agent, 0.1-0.5 parts of the leveling agent, and antifreeze agent 1- 2 parts, 0.3-0.7 parts of thickener and 0.2-0.5 parts of antifoaming agent. These auxiliaries can be of a conventionally known type.

Preferably, the film forming aid is an environmentally friendly film forming aid ester alcohol 12 supplied by Eastman Teanol. The additive is a particularly excellent coalescing aid, is a filming aid for the polymerization emulsion, and is also a good solvent for the polymerization emulsion, and can effectively reduce the minimum film formation temperature of the polymerization emulsion. The additive has a certain volatility, and stays in the coating film to form a film during the film formation process, and all volatilizes after film formation, and does not remain in the dry film, so it does not affect the film properties. The solubility in water is low, and the stability of the polymerization emulsion is not affected after being added, but the film formation performance of the coating film can be remarkably improved, and the weather resistance, abrasion resistance, stain resistance and chemical resistance of the coating film can be improved. Improve coating color development.

The wetting and dispersing agent is preferably BYK-192 produced by BYK Company. The wetting and dispersing agent is specially used for water-based paint, and the water-based paint has the effect of reducing the surface tension, wetting the substrate, and dispersing the color paint.

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 antifreeze agent is preferably propylene glycol, which is environmentally friendly and cost effective. The thickener is preferably a 2020 NPR nonionic polyurethane associative type produced by Rohm and Haas Company, which provides efficient medium shear thickening, promotes flow leveling, and provides good film fullness.

The antifoaming agent is preferably BYK-022 of BYK Chemical, which is an organic antifoaming agent for aqueous coatings, which has no effect on color acceptability and gloss. When added, a high enough shear force is required to avoid shrinkage. This defoamer has excellent long-term stability and is extremely effective against microbubbles. It does not contain VOC and has very High environmental protection.

Adding the above combination of additives can improve and strengthen the corresponding physical and chemical functions.

In addition, other substances may be added according to the different properties of the plant-based insect repellent functional water-based wood lacquer product. For example, in order to obtain products of different colors, different pigments may be added, such as organic black syrup, titanium dioxide (titanium dioxide), organic yellow syrup, and the like. The organic black paste is preferably Colanyl Black N. Titanium dioxide is preferably R-996 of Sichuan Longyan Titanium Industry Co., Ltd. Its surface is treated by bismuth, aluminum, zirconium and organic treatment. It has no physiological toxicity, stable chemical properties, excellent pigment performance, whiteness, brightness and luster. Good, opaque, achromatic and fluid. The organic medium yellow pulp is preferably Clariant's organic yellow pulp Colanyl Yellow 2GXD. Organic black pulp and organic yellow pulp do not contain harmful heavy metals, which are environmentally friendly, have good color development, strong hiding power and high gloss performance.

Further, 5-7 parts by weight of organic black pulp Colanyl Black N; 2.5-5 parts by weight of deionized water can be used to form a water-based black wood topcoat for plant sterilization and insect repellent function.

Further adding titanium dioxide (titanium dioxide) R-996 20-25 parts by weight; deionized water 2.5-5 parts by weight can constitute a plant sterilization and insect repellent functional water-based white wood topcoat.

Further, organic yellow pulp Colanyl Yellow 2GXD 12-20 parts by weight; deionized water 2.5-7 parts by weight can constitute a plant bactericidal and insect repellent functional water-based yellow wood topcoat.

In addition, it is also possible to select whether or not to add matting powder according to the transparency and gloss of the plant-based insect repellent functional water-based wood lacquer. Generally, when the high-gloss paint is used, no matting powder is added. When the matting powder is added, the gloss of the product is lowered, and the matte and medium-light products can be made. The matting powder is preferably OK-520 nano-level matting powder of Degussa.

Adding nano-polishing powder OK-520 0-12 parts by weight; deionized water 2.5-7 parts by weight can form full-bright seven-point, five-point, three-point, matte transparent plant sterilization and insect repellent functional water-based wood lacquer.

In addition, depending on the actual pH of the wood lacquer product, a pH adjuster may be added. When the pH of the final product is not between 8 and 9, an appropriate amount of pH adjuster is added. The pH adjuster is preferably AMP-96 manufactured by Dow, which stabilizes the pH of the system while improving the performance of the thickener in the aqueous paint. By replacing the traditional ammonia water with it, the ammonia smell of the paint can be reduced.

The plant bactericidal and deworming functional type water-based wood lacquer of the invention contains the phytochemical composite nano bactericidal powder, and the component can play the role of anti-mildew and antibacterial sterilization, so that it is no longer necessary to use a preservative.

The invention also provides a method for preparing the above-mentioned plant sterilization and insect repellent functional water-based wood lacquer, the method comprising the steps of: putting water, a wetting dispersing agent and an antifoaming agent into a container for high-speed stirring, and then adding an aliphatic modification Polyurethane dispersion, hardening resin, fully stirred, adding filming aid, antifreeze, wax emulsion, leveling agent and plant-based compound nano-bacterial powder, fully stirred to adjust the pH value, adding thickener to adjust the viscosity.

Preferably, the high-speed stirring speed is 1200-1600 rpm, and the time is 20-30 minutes; when the aliphatic modified polyurethane dispersion is added, the stirring speed is 800-1100 rpm, and the stirring time is 5-15 minutes; After the water-soluble composite nano anion powder, the stirring time is 2-10 minutes; the final pH is 8-9.

As described above, pigments, matting powders, and the like may be further added depending on the needs of the final product. According to the needs of the final viscosity of the product, according to customer requirements, thickeners can be added for adjustment.

The beneficial effects of the invention are:

1. The raw material contains castor oil modified polyurethane dispersion and hardening resin, so that the waterborne wood lacquer can reach or exceed the oily wood lacquer in physical and chemical technical indicators; at the same time, the ramie vegetable oil can be regenerated, the source is wide, and the price is low, so that the woodware The cost of paint products is low.

2. The plant-based composite nano-bacterial powder is added to the raw material, which can be prepared by the infrared dehydration technology and the nano production technology, which are abundant and easily available, such as purslane, pine needle, camphor tree, oriental arborvitae and cedar. It is low in cost, but it is bacteriostatic, anti-mildew, and deworming efficient and durable. The bactericidal, antibacterial and antifungal performance of the wood lacquer of the invention exceeds 99% of the grade I of the industry standard HG/T3950-2007 antibacterial coating; the durability of the antibacterial and mildewproof exceeds the industry standard HG/T3950-2007 antibacterial coating of the grade I 95% .

3. Different performances of wood lacquer products can be obtained by adding different auxiliaries. The product range is rich, the application is extensive, and the preparation method of the wood lacquer is also simple, the cost is low, and the industrial production can be carried out.

4. The product formulation design does not add a cosolvent containing volatile organic compounds, and does not contain heavy metals harmful to the human body. The product can achieve ultra-low VOC and has good environmental protection.

The invention will be further clarified by the specific examples of the invention given below, but they are not intended to limit the invention. Portions not specifically described in the detailed description are obtained using prior art, well-known technical means, and industry standards.

Unless otherwise stated, the parts used in the present invention are all parts by weight.

Preparation example of botanical composite nanobacterial powder, aliphatic modified polyurethane dispersion, and hardening resin

Washing and slicing fresh leaves, branches and roots of camphor tree, cedar, pine needle, arborvitae, and purslane, and rapidly dehydrating and drying by infrared radiation heating, the moisture contained in the roots of leaves and branches is rapidly reduced and dried. Performing nano-grinding production technology for grinding and pulverizing to obtain nanometer-sized particle size Nano citron tree powder, nano cedar powder, nano pine needle powder, nano arborvitae powder, nano dentate powder. Then, these nano-grade vegetable germicidal powders are mixed in the proportion by weight shown in Table 1 to prepare corresponding vegetable-based composite nano-sterilized powder. The particle size of the nanopowder is also shown in Table 1.

The aliphatic modified polyurethane dispersion was prepared by a prepolymer mixing method from the parts by weight of the raw materials shown in Table 2.

The hardening resin-modified aldehyde ketone resin is prepared by prepolymerization from the parts by weight of the raw materials shown in Table 3.

Example 1

Prepare a water-based black wood topcoat for plant sterilization and deworming function according to the formula weight of Table 4, including the following steps:

a) According to the weight set of the formula, the raw materials are used, and the water, the wetting and dispersing agent, the black pulp and the defoaming agent are put into the container and stirred at a high speed for 1300~1400 rpm, stirred for 15 minutes, and the rotation speed is reduced to 1000 rpm. Adding aliphatic modified polyurethane dispersion and hardening resin while stirring, stirring for 10 minutes, adding antifreeze, wax emulsion and plant-based compound nano-bacterial powder in sequence for 5 minutes, the rotation speed is reduced to 600 rpm, and pH adjustment is added. The agent adjusts the pH to 8 and adds a thickener to adjust to the viscosity desired by the customer.

b) Detection - filtration - packaging - sample retention.

Example 2

The adjustment of the formulation ratio of this embodiment is shown in Table 4. The specific implementation process is basically the same as that of Embodiment 1, except that the high-speed stirring speed is 1400-1500 rpm and the stirring time is 30 minutes.

Example 3

The adjustment of the formulation ratio of this embodiment is shown in Table 4. The specific implementation process is basically the same as that of Embodiment 1, except that the high-speed stirring speed is 1300-1400 rpm and the stirring time is 15 minutes.

Example 4

The adjustment of the formulation ratio of this embodiment is shown in Table 4. The specific implementation process is basically the same as that of Embodiment 1, except that the high-speed stirring speed is 1300-1400 rpm and the stirring time is 20 minutes.

The above-mentioned prepared plant-based insect repellent functional water-based wood lacquer is tested according to the national standard GB/T 23999-2009 "interior decoration water-based wood coating" and HG/T3950-2007 anti-bacterial coating, and the technical performance is tested. See Table 5.

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

Claims (8)

The invention relates to a plant sterilization and insect repellent functional water-based wood lacquer, which comprises the following components by weight: 60-85 parts of aliphatic modified polyurethane dispersion, 0.3-0.8 parts of vegetable composite nano bactericide powder, and hardening resin 1-3 Parts, water 7-10 parts, wax emulsion 1-3 parts and other auxiliaries; wherein the weight ratio of the other auxiliaries is: 2-5 parts of film forming aid, 0.2-0.7 parts of wetting and dispersing agent, leveling agent 0.1-0.5 parts, 1-2 parts of antifreeze, 0.3-0.7 parts of thickener and 0.2-0.5 parts of antifoaming agent; wherein the synthetic raw materials of the aliphatic modified polyurethane dispersion include vegetable oil, isophorone II Isocyanate, polyether diol and aminopropyl triethoxy decane, the aliphatic modified polyurethane dispersion is prepared by a prepolymer-ionomer mixing method; wherein the phytochemical composite nano sterilizing powder The ratio of the weight of each raw material is nanometer dentate powder: nano citron tree powder: nano cedar powder: nano pine needle powder: nano arborvitae powder = 1-5: 1-3: 0-3: 1- 3:0-2. The plant bactericidal and insect repellent functional waterborne wood lacquer according to claim 1, wherein the vegetable oil is castor oil. The phyto-bacterial and insect-repellent functional water-based wood lacquer according to claim 1, wherein the phytochemical composite nano-bacterial powder is prepared by the corresponding plants by infrared radiation dehydration technology and nano production technology. The botanical bactericidal and insect repellent functional waterborne wood lacquer according to claim 1, wherein the phytochemical composite nano bactericidal powder has a particle diameter of 40 to 100 nm. The invention relates to a plant bactericidal and insect repellent functional water-based wood lacquer according to claim 1, wherein the hardening resin is a solvent-free aqueous modified aldehyde ketone resin dispersion, and the synthetic raw material package thereof Including aldehyde and ketone resin, hydrophilic monomer dimethylol butyric acid and dihydroxy polyoxyethylene ether, polyadipyl maleate and isophorone diisocyanate, the hardening resin is by prepolymer - Prepared by the mixture polymerization method. The phyto-bacterial and insect-repellent functional water-based wood lacquer according to any one of claims 1 to 5, further comprising at least one of a pigment, a matting powder and a pH adjuster, wherein the pigment is an organic black syrup , titanium dioxide or organic yellow pulp. A method for preparing a plant bactericidal and insect repellent functional water-based wood lacquer according to any one of claims 1 to 6, which comprises the steps of: putting water, a wetting and dispersing agent and a defoaming agent into The container is stirred and dispersed, and then the aliphatic modified polyurethane dispersion, the hardening resin is added, and after sufficiently stirring, a film forming aid, an antifreezing agent, the wax emulsion, a leveling agent, and the botanical composite nano sterilization are added. Powder, stir well, adjust the pH to 8-9, and finally add thickener to adjust the viscosity. The preparation method according to claim 7, wherein the water, the wetting and dispersing agent and the antifoaming agent are added at a stirring speed of 1200-1600 rpm, and the time is 15-30 minutes; adding the aliphatic The stirring speed of the modified polyurethane dispersion is 800-1100 rpm, and the stirring time is 5-15 minutes; after adding the phytochemical composite nano sterilizing powder, the stirring time is 2-10 minutes.