Insect-repelling functional coating

Abstract

The invention belongs to the technical field of daily necessities, and discloses an insect-repelling functional coating which comprises the following components in percentage by mass: 8-12% of a natural insect-repelling active matter, 5-8% of a microcapsule wrapping agent, 40-55% of water-based acrylic resin, 2-3% of an adhesion promoter, 3-5% of nano titanium dioxide, 1-2% of a hydrophobic modifier and deionized water, a water-based system is adopted to replace a solvent type carrier, the VOC content is smaller than 30 g / L and is reduced by 80% or above compared with that of a traditional coating, harmful volatile matter such as benzene series and formaldehyde is eradicated from the source, the coating is suitable for being in contact with daily necessities such as garbage cans, the risk that children make contact with toxicity is avoided, the release period of active ingredients is prolonged to 6-12 months through the microcapsule slow release technology, and the 30-day continuous repelling rate is kept at 85-92%; according to the present invention, the annual average repair coating frequency is reduced from 4-12 times to 1-2 times, the maintenance cost is reduced by 70%, the adhesion force is improved, the problem that the traditional coating material is easy to peel off is solved, the adhesion force of the plastic base material achieves the 4B level, the adhesion force of the metal base material achieves the 5B level, the long-term stable effect of the coating is ensured, the effects pass the GB / T31711-2015, the ASTMD3359 and other standard tests and verification, and the practical application and operation are easily achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of daily necessities, in particular to an insect repellent functional coating. Background Art

[0002] Currently, commercially available insect repellent coatings primarily utilize chemical insecticides to achieve their insect repellent function. A typical approach involves using pyrethroids, DEET, and other active chemical ingredients as core repellents, along with solvent-based carriers containing volatile organic compounds (VOCs) such as benzene and formaldehyde. These coatings are then cured at high temperatures or with the addition of plasticizers to enhance film-forming properties. These coatings are primarily used in outdoor construction, agricultural facilities, and other applications. In the consumer goods sector,

[0003] Existing insect control solutions mostly rely on physical barriers (such as sealing strips) or short-term insect repellent sprays. The former can only block pest invasion but has no active repellent effect, while the latter is short-lived (usually less than 7 days) and requires frequent operation. There is no long-term environmentally friendly coating solution suitable for substrates such as plastics and metals. Summary of the Invention

[0004] One of the objects of the present invention is to provide an insect repellent functional coating.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: an insect repellent functional coating, comprising the following ingredients by mass percentage: 8%-12% of a natural insect repellent active substance, 5%-8% of a microcapsule encapsulating agent, 40%-55% of a water-based acrylic resin, 2%-3% of an adhesion promoter, 3%-5% of nano-titanium dioxide, 1%-2% of a hydrophobic modifier, and deionized water;

[0006] The natural insect repellent active substance is the core insect repellent component, the microcapsule encapsulation agent is a slow-release carrier, the water-based acrylic resin is an environmentally friendly substrate, the adhesion promoter is used to improve the adhesion of the substrate, the nano titanium dioxide is used for photocatalytic antibacterial, the hydrophobic modifier is used for antifouling, and the deionized water is used as a solvent.

[0007] Preferably, the natural insect repellent active ingredients include citronella oil and lemon eucalyptus oil. Both citronella oil and lemon eucalyptus oil are natural ingredients with broad-spectrum insect repellent functions, and have a repellent effect on cockroaches, fruit flies, and ants.

[0008] Preferably, the microcapsule encapsulation agent is a chitosan-silicon dioxide composite, which can control the active ingredient to be 0.5-1.2 mg / cm 2 The adhesion promoter is silane coupling agent KH-560, which can make the coating adhesion reach 4B level on plastic substrates and 5B level on metal substrates in the 100-degree test.

[0009] Preferably, the method comprises the following steps:

[0010] Step 1: Pre-emulsification: Mix the natural insect repellent active ingredient and the microcapsule encapsulation agent in a mass ratio of 1:0.6, add deionized water accounting for 30% of the total water volume, and emulsify at 50-60°C and 500 rpm for 30 minutes to form a microcapsule suspension with a particle size of 100-200 nm;

[0011] Step 2: Base material synthesis: add water-based acrylic resin, adhesion promoter, and nano-titanium dioxide into the reactor, control the temperature at 70-80°C, and stir at 200 rpm under nitrogen protection for 1 hour to form a uniform dispersion;

[0012] Step 3: Compounding and aging: slowly add the pre-emulsified microcapsule suspension to the base material, simultaneously add the hydrophobic modifier, and age at 40-50°C for 2 hours, controlling the viscosity at 200-300 mPa·s;

[0013] Step 4: Curing and forming: Apply the coating to the surface of the substrate with a wet film thickness of 50-80μm and use 80-100℃ hot air curing for 10 minutes or UV curing with a UV curing wavelength of 365nm and an irradiation intensity of 800mJ / cm 2 .

[0014] Preferably, the substrate includes a plastic or metal daily necessities substrate, and the insect repellent coating is applied to the surface of daily necessities, such as trash cans, municipal facilities, and similar items that require insect repellency, antibacterial properties, and antifouling properties. The recommended dosage is 2-3 g / dm2.

[0015] Preferably, the coating has a repellency rate of 85%-92% for cockroaches, fruit flies and ants within 30 days, a VOC content of less than 50 g / L, an inhibition rate for Escherichia coli of ≥99%, and a hydrophobic contact angle of ≥110°.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention adopts a water-based system instead of a solvent-based carrier through its formula, with a VOC content of less than 30g / L, which is more than 80% lower than that of traditional coatings. It eliminates harmful volatile substances such as benzene and formaldehyde from the source, and is suitable for daily contact scenarios such as trash cans to avoid toxic risks for children. The microcapsule sustained-release technology extends the release cycle of the active ingredient to 6-12 months, and the 30-day continuous repellency rate remains at 85%-92%. The average annual recoating frequency is reduced from 4-12 times to 1-2 times, and the maintenance cost is reduced by 70%. The improved adhesion solves the problem of easy peeling of traditional coatings. The adhesion of plastic substrates reaches level 4B and that of metal substrates reaches level 5B, ensuring that the coating can function stably and long-term. At the same time, the effects have been verified by standard tests such as GB / T31711-2015 and ASTMD3359.

[0018] Performance test results:

[0019] DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0021] In the description of the present invention, it should be noted that, for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, which indicate directions and positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present invention.

[0022] It should be noted that the terms "first" and "second" in the description and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0023] One of the preferred embodiments of the present invention is an insect repellent functional coating, comprising the following ingredients by mass percentage: 8%-12% of a natural insect repellent active ingredient, 5%-8% of a microcapsule encapsulating agent, 40%-55% of a water-based acrylic resin, 2%-3% of an adhesion promoter, 3%-5% of nano-titanium dioxide, 1%-2% of a hydrophobic modifier, and deionized water;

[0024] The natural insect repellent active substance is the core insect repellent component, the microcapsule encapsulation agent is a slow-release carrier, the water-based acrylic resin is an environmentally friendly substrate, the adhesion promoter is used to improve the adhesion of the substrate, the nano titanium dioxide is used for photocatalytic antibacterial, the hydrophobic modifier is used for antifouling, and the deionized water is used as a solvent.

[0025] The natural insect repellent active ingredients include citronella oil and lemon eucalyptus oil. Both citronella oil and lemon eucalyptus oil are natural ingredients with broad-spectrum insect repellent functions and have repellent effects on cockroaches, fruit flies, and ants.

[0026] The microcapsule encapsulation agent is a chitosan-silicon dioxide composite, which can control the active ingredient to 0.5-1.2 mg / cm 2 The adhesion promoter is silane coupling agent KH-560, which can make the coating adhesion reach 4B level on plastic substrates and 5B level on metal substrates in the 100-degree test.

[0027] The following steps are involved:

[0028] Step 1: Pre-emulsification: Mix the natural insect repellent active ingredient and the microcapsule encapsulation agent in a mass ratio of 1:0.6, add deionized water accounting for 30% of the total water volume, and emulsify at 50-60°C and 500 rpm for 30 minutes to form a microcapsule suspension with a particle size of 100-200 nm;

[0029] Step 2: Base material synthesis: add water-based acrylic resin, adhesion promoter, and nano-titanium dioxide into the reactor, control the temperature at 70-80°C, and stir at 200 rpm under nitrogen protection for 1 hour to form a uniform dispersion;

[0030] Step 3: Compounding and aging: slowly add the pre-emulsified microcapsule suspension to the base material, simultaneously add the hydrophobic modifier, and age at 40-50°C for 2 hours, controlling the viscosity at 200-300 mPa·s;

[0031] Step 4: Curing and forming: Apply the coating to the surface of the substrate with a wet film thickness of 50-80μm and use 80-100℃ hot air curing for 10 minutes or UV curing with a UV curing wavelength of 365nm and an irradiation intensity of 800mJ / cm 2 .

[0032] The substrate includes plastic and metal daily necessities substrates. The insect repellent coating is applied to the surface of daily necessities, which include trash cans, municipal facilities and similar items that require insect repellency, antibacterial and antifouling properties. The recommended dosage is 2-3g / dm2.

[0033] The coating has a repellency rate of 85%-92% for cockroaches, fruit flies and ants within 30 days, a VOC content of less than 50 g / L, an inhibition rate for Escherichia coli of ≥99%, and a hydrophobic contact angle of ≥110°.

[0034] Working principle:

[0035] When used, the coating achieves insect repellent and multifunctional synergistic effects through a mechanism where natural insect repellent active substances (such as citronella oil and lemon eucalyptus oil) are encapsulated in chitosan-silica composite microcapsules to form a sustained-release carrier with a particle size of 100-200nm. After being coated on the surface of the substrate and cured, the microcapsules slowly break down under the influence of ambient humidity and temperature, releasing 0.5-1.2mg / cm 2 ·Continuously releases insect repellent ingredients at a rate of 24 hours, interfering with the chemical receptors of pests such as cockroaches, fruit flies, and ants by volatile odors, causing them to actively avoid the coating surface, achieving long-term repellency;

[0036] Water-based acrylic resin is used as the base material to form a continuous and dense paint film during the curing process, with a VOC content of less than 50g / L, meeting environmental protection and safety requirements; silane coupling agent KH-560 is used as an adhesion promoter to connect the resin with the surface of plastic, metal and other substrates through chemical bonding, so that the coating adhesion reaches level 4B (plastic) or level 5B (metal) in the Baige test, avoiding peeling and failure; nano-titanium dioxide produces a photocatalytic effect under light, destroying the cell membrane structure of microorganisms such as Escherichia coli, with a 24-hour antibacterial rate of ≥99%; fluorocarbon surfactant is used as a hydrophobic modifier to form a low-energy interface on the paint film surface, making the contact angle ≥110°, reducing stain adhesion and achieving anti-fouling function.

[0037] The above describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and description merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. Insect repellent functional coating, characterized in that: The invention comprises the following ingredients by mass percentage: 8%-12% of natural insect repellent active material, 5%-8% of microcapsule encapsulation agent, 40%-55% of water-based acrylic resin, 2%-3% of adhesion promoter, 3%-5% of nano titanium dioxide, 1%-2% of hydrophobic modifier and deionized water; The natural insect repellent active substance is the core insect repellent component, the microcapsule encapsulation agent is a slow-release carrier, the water-based acrylic resin is an environmentally friendly substrate, the adhesion promoter is used to improve the adhesion of the substrate, the nano titanium dioxide is used for photocatalytic antibacterial, the hydrophobic modifier is used for antifouling, and the deionized water is used as a solvent.

2. The insect repellent functional coating according to claim 1, wherein: The natural insect repellent active ingredients include citronella oil and lemon eucalyptus oil. Both citronella oil and lemon eucalyptus oil are natural ingredients with broad-spectrum insect repellent functions and have repellent effects on cockroaches, fruit flies, and ants.

3. The insect repellent functional coating according to claim 1, wherein: The microcapsule encapsulation agent is a chitosan-silicon dioxide composite, which can control the active ingredient to 0.5-1.2 mg / cm 2 The adhesion promoter is silane coupling agent KH-560, which can make the coating adhesion reach 4B level on plastic substrates and 5B level on metal substrates in the 100-degree test.

4. The insect repellent functional coating according to claim 1, wherein: The following steps are involved: Step 1: Pre-emulsification: Mix the natural insect repellent active ingredient and the microcapsule encapsulation agent in a mass ratio of 1:0.6, add deionized water accounting for 30% of the total water volume, and emulsify at 50-60°C and 500 rpm for 30 minutes to form a microcapsule suspension with a particle size of 100-200 nm; Step 2: Base material synthesis: add water-based acrylic resin, adhesion promoter, and nano-titanium dioxide into the reactor, control the temperature at 70-80°C, and stir at 200 rpm under nitrogen protection for 1 hour to form a uniform dispersion; Step 3: Compounding and aging: slowly add the pre-emulsified microcapsule suspension to the base material, simultaneously add the hydrophobic modifier, and age at 40-50°C for 2 hours, controlling the viscosity at 200-300 mPa·s; Step 4: Curing and forming: Apply the coating to the surface of the substrate with a wet film thickness of 50-80μm and use 80-100℃ hot air curing for 10 minutes or UV curing with a UV curing wavelength of 365nm and an irradiation intensity of 800mJ / cm 2 .

5. The insect repellent functional coating according to claim 1, wherein: The substrate includes plastic and metal daily necessities substrates. The insect repellent coating is applied to the surface of daily necessities, which include trash cans, municipal facilities and similar items that require insect repellency, antibacterial and antifouling properties. The recommended dosage is 2-3g / dm2.

6. The insect repellent functional coating according to claim 1, wherein: The coating has a repellency rate of 85%-92% for cockroaches, fruit flies and ants within 30 days, a VOC content of less than 50 g / L, an inhibition rate for Escherichia coli of ≥99%, and a hydrophobic contact angle of ≥110°.

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