CN114456631B - Damping coating for preventing termites - Google Patents

Abstract

The invention provides a damping paint for preventing termites, which comprises the following components: 20-28 wt% of matrix resin, 15-20 wt% of inorganic filler, 5-10 wt% of wood fiber, 15-25 wt% of waste rubber powder, 5-10 wt% of microcapsule suspension containing insecticide and 5-15 wt% of water. The coating prepared by the microcapsule embedding slow release method adopted by the damping coating for preventing the termites has the characteristics of termite prevention, good chemical stability, controllable release speed, good damping effect, low cost and the like.

Description

Damping coating for preventing termites

Technical Field

The invention relates to the field of coating composition metals, in particular to a termite-proof damping coating.

Background

Noise is seen everywhere in our lives, which has a great impact on people's lives and health, causing adverse effects such as hearing loss, gastric dysfunction, and sympathetic nervous system. Vibration is a source of noise, and two methods for reducing vibration mainly comprise vibration isolation and damping vibration attenuation. The latter is a damping technology, in which a layer of damping paint is painted or sprayed on a vibrating thin plate to change one kind of energy (mechanical vibration) into other kinds of energy (heat energy) for dissipation. At present, the most used water-based damping coating is composed of emulsion, inorganic filler and functional auxiliary agent; the research on the emulsion mainly relates to the aspects of blending, copolymerization, hyperbranched, core-shell structure modification and the like of the emulsion, and the technology is relatively mature. The filler has great influence on the damping of the emulsion, and the presence of the filler can increase the friction effect between the filler and a high molecular chain segment, reduce the content of the emulsion and reduce the cost. How to find the environment-friendly filler with good damping effect and cost saving is a problem needing to be researched.

The cement mortar and the silicate concrete are adopted on the building wall surface and the building ground, so that moisture is easy to absorb, and the damp air can enable wood products and the cement mortar to become objects corroded by termites, so that people often spray termite-proof drugs on the possible places or the surfaces of the objects, but the drug effect is reduced or even the drug effect is ineffective once the drugs are damped. In addition, mica powder, aluminum powder, graphite and glass beads are used as the filler of the damping coating, so that the damping coating has the defects of high manufacturing cost and high energy consumption.

In southern areas, due to humid climate, wood products and mortar in house buildings containing much moisture or water are most likely to be objects damaged by termites, and the termites can also damage plastics, wires and cables, steel bars in concrete and the like, so that the termite-proof house decoration board has great harm and can greatly shorten the service life of house decoration engineering. In order to solve the problems, the important significance is achieved by providing the damping coating which has the function of termite prevention.

Disclosure of Invention

The invention aims to provide a damping coating which has both termite-proof performance and damping performance.

In view of the above, the present application provides a damping paint for termite prevention, comprising:

the carrier in the microcapsule emulsion containing the insecticide is fly ash.

Preferably, the microcapsule suspension is a suspension with chrysanthemic chloride ester and phoxim insecticide as capsule cores and terephthaloyl chloride and ethylenediamine as capsule walls, and the mass ratio of the capsule cores to the capsule walls is 1:4.

preferably, the damping coating also comprises a functional additive, and based on the damping coating, the functional additive comprises 0.1-1 wt% of a dispersing agent, 0.5-1.5 wt% of a defoaming agent, 1-5 wt% of a phosphorus flame retardant, 0.5-5 wt% of a film-forming additive and 0.5-1 wt% of a bactericide.

Preferably, the matrix resin is selected from one or more of styrene-acrylic, pure acrylic and VAE emulsions.

Preferably, the inorganic filler is chosen from ground CaCO ₃ One or more of talc and graphite.

Preferably, the waste rubber powder is selected from 40-50 meshes, 60-90 meshes and 100-150 meshes of gradation, and the mass ratio is (1-2): (3-5): (1-3).

Preferably, the wood fiber has a particle size of 15 to 200 μm.

Preferably, the preparation method of the pesticide-containing microcapsule suspension comprises the following steps:

mixing protective colloid, emulsifier, water and alkali liquor to obtain a mixed water phase;

mixing fly ash, chrysanthemums, phoxim, terephthaloyl chloride and an organic solvent to obtain a mixed organic phase;

and emulsifying the mixed organic phase and the mixed water phase, and then adding an ethylenediamine aqueous solution to perform interfacial polymerization reaction to obtain the microcapsule suspension containing the pesticide.

Preferably, the protective colloid is polyvinyl alcohol, and the emulsifier is OP-10.

Preferably, the preparation method of the damping coating specifically comprises the following steps:

mixing inorganic filler, water, wood fiber, waste rubber powder and matrix resin according to the weight ratio to obtain damping coating emulsion;

and mixing the damping coating emulsion and the microcapsule suspension containing the insecticide to obtain the damping coating.

The application provides a damping coating for preventing termites, wherein a microcapsule suspension containing an insecticide is added, the insecticide is prepared by a microcapsule embedding slow-release method, the coating has termite resistance and good chemical stability, the release speed is controllable, and meanwhile, the fly ash particles used as a microcapsule carrier can load the insecticide due to the porous structure, so that the slow-release effect is achieved, the sound absorption effect of the damping coating can be enhanced, and the loss coefficient is improved; furthermore, the waste rubber powder is used as a filler, and the energy of vibration can be converted into heat energy through friction, so that the noise is reduced. Therefore, the damping coating provided by the application obviously improves the termite-proof function of the damping coating material under a humid condition, the damping coefficient of the material at the normal temperature of 20 ℃ can reach 0.25, and the damping performance of the damping coating is obviously improved.

Drawings

FIG. 1 is a schematic view of the internal structure of a microcapsule of the present invention;

FIG. 2 is a schematic view of rubber particles of the present invention.

Detailed Description

For a further understanding of the present invention, reference will now be made to the following preferred embodiments of the invention in conjunction with the examples, but it is to be understood that the description is intended to further illustrate the features and advantages of the invention and is not intended to limit the scope of the claims which follow.

In order to improve the termite-proof performance and the damping performance of the floor damping coating in the environment such as a supermarket and the like and reduce the cost, the termite-proof damping coating prepared by adopting the microcapsule embedding slow release method has the characteristics of termite resistance, good chemical stability, controllable release speed, high damping effect, low cost and the like. Specifically, the embodiment of the invention discloses a termite-proof damping coating, which comprises the following components in part by weight:

the carrier in the microcapsule emulsion containing the insecticide is fly ash.

In the damping coating provided by the application, the matrix resin is selected from one or more of styrene-acrylic, pure acrylic and VAE emulsion, such as basf 7080, basf 2438, beijing petrochemical BJ-707 and the like; the content thereof is 20 to 28wt%, specifically, the content of the matrix resin is 22 to 26wt%, more specifically, the content of the matrix resin is 23 to 25wt%.

The inorganic filler is chosen in particular from ground CaCO ₃ One or more of talc and graphite, more specifically, one or more selected from the group consisting of next peak chemical HD-125, next peak talc 3000 mesh and next peak graphite powder; the content of the inorganic filler is 15 to 20wt%, more specifically, 16 to 18wt%.

The wood fibres are selected from fibrous materials known to the person skilled in the art, and have a particle size in particular in the range of 18 to 200 μm. The content of the wood fiber is 5 to 10wt%, more specifically, 6 to 8wt%.

The waste rubber powder is specifically selected from 40-50 meshes, 60-90 meshes and 100-150 meshes of gradation, and the mass ratio is (1-2): (3-5): (1-3) as shown in FIG. 2. The waste rubber powder of the grading is more beneficial to improving the damping effect of the damping coating. The content of the waste rubber powder is 15 to 25wt%, more specifically, 17 to 23wt%.

The preparation method of the pesticide-containing microcapsule suspension comprises the following steps:

mixing protective colloid, emulsifier, water and alkali liquor to obtain a mixed water phase;

mixing fly ash, chrysanthemums, phoxim, terephthaloyl chloride and an organic solvent to obtain a mixed organic phase;

and emulsifying the mixed organic phase and the mixed water phase, and then adding an ethylenediamine aqueous solution to perform interfacial polymerization reaction to obtain the microcapsule suspension containing the pesticide.

In the preparation process, the fly ash is used as a carrier of the microcapsule, has a porous structure, can load an insecticide and has a slow release effect; meanwhile, the sound absorption effect of the damping coating can be enhanced, and the loss coefficient is improved; the microcapsule structure comprises a capsule core and a capsule wall, and the release speed of the drug in the capsule core is reduced, and the principle of the microcapsule is shown in figure 1. In the preparation process, the protective colloid is polyvinyl alcohol, and the emulsifier is OP-10; the mass ratio of the fly ash to the pesticide (the mass ratio of the chrysanthemic ester and the phoxim of 1:2) is 6.5:1 to 3.5:1; the mass ratio of the terephthaloyl chloride to the ethylenediamine is 1:1 to 1:3.

the content of the pesticide-containing microcapsule suspension in the present application is 5 to 10wt%, more specifically, the content of the pesticide-containing microcapsule suspension is 6 to 9wt%; in the suspension, the chrysanthemums and the phoxim pesticides are used as capsule cores, the terephthaloyl chloride and the ethylenediamine are used as suspension of capsule walls, and the mass ratio of the capsule cores to the capsule walls is 1:4.

the damping coating also comprises a functional additive, and on the basis of the damping coating, the functional additive comprises 0.1-1 wt% of a dispersing agent, 0.5-1.5 wt% of a defoaming agent, 1-5 wt% of a phosphorus flame retardant, 0.5-5 wt% of a film-forming additive and 0.5-1 wt% of a bactericide; specifically, the functional auxiliary agent is selected from Mingxiang SPA202, sanding Jia SDJ8003, baotai phosphorus flame retardant, kaiyin chemical OE-300, stand erect GY-916 and the like.

The preparation method of the damping coating specifically comprises the following steps:

mixing inorganic filler, water, wood fiber, waste rubber powder and matrix resin according to the weight ratio to obtain damping coating emulsion;

and mixing the damping coating emulsion and the microcapsule suspension containing the insecticide to obtain the damping coating.

The damping coating for preventing the termites provided by the application obviously improves the function of the damping coating material for preventing the termites under the humid condition, the damping coefficient of the material at the normal temperature of 20 ℃ can reach 0.25, and the damping performance of the damping coating is obviously improved.

For further understanding of the present invention, the damping paint for termite prevention provided by the present invention will be described in detail with reference to the following examples, and the scope of the present invention is not limited by the following examples.

Examples

The preparation process of the termite-proof damping coating comprises two parts:

1) The first part is to prepare a suspension of microcapsules containing the insecticide: which comprises the following components: the chrysanthemumchloride and the phoxim insecticide are used as capsule cores, the terephthaloyl chloride and the ethylenediamine are used as suspension of capsule walls, and the mass ratio of the core walls is 1:4, sodium hydroxide is used as an acid-binding agent, an emulsifier op-10 and polyvinyl alcohol is used as a protective colloid; the preparation process comprises the following steps:

preparing a water phase: adding a certain amount of polyvinyl alcohol and OP-10 into distilled water, uniformly stirring, and then adding a certain amount of sodium hydroxide solution, wherein the stirring speed is 1000-1200 r/m;

preparing an organic phase: dissolving flyash powder, chrysanthemumchloride, phoxim and paraphthaloyl chloride in organic solvent carbon tetrachloride, mixing and stirring uniformly at the stirring speed of 500-1000 r/min;

emulsification: dispersing the organic phase into the water phase for emulsification, and stirring at high speed of 1200-1500 rpm.

Encapsulation: under the stirring state, adding an aqueous solution of ethylenediamine, carrying out interfacial polymerization reaction, and when the pH value of a medium is not changed, finishing the reaction to obtain a microcapsule suspension containing the pesticide;

in the process of preparing the microcapsule, the mass ratio of the fly ash to the pesticide (the mass ratio of the chrysanthemic ester 1:2 to the phoxim) is 6.5:1 to 3.5:1; the mass ratio of the terephthaloyl chloride to the ethylenediamine is 1:1 to 1:3.

2) And the second part is to prepare damping coating emulsion:

the preparation process comprises the following steps:

inorganic filler premixing: mixing heavy calcium carbonate, graphite and talcum powder;

uniformly mixing the matrix resin emulsion, water and the defoaming agent according to the formula ratio, adding the wood fiber and the rubber powder, and stirring at the speed of 800-1000 rpm; stirring for about 15min, and adding the inorganic filler, the bactericide, the dispersant, the flame retardant and the film-forming assistant to prepare the damping emulsion.

Mixing of microcapsule suspension and damping emulsion:

and mixing the first part and the second part, and stirring at the speed of 800-1000 rpm to obtain the functional damping coating with the termite-proof effect.

The specific embodiment is as follows:

TABLE 1 ingredient content of damping coating in examples 1 to 8 (wt%)

Table 2 performance test results of damping coatings of examples 1 to 8

And (3) termite prevention effect verification test:

the termite-proof damping coating is prepared according to the proportion of 5m ² Coating the inner wall of a wood box body with the size of 500 multiplied by 800 multiplied by 400 with the coating amount of/kg, and coating the inner wall of the wood box body for 2 times after the first time of coating and drying and the second time of coating. Digging a throwing opening with the diameter of 30 mm at the top of the box body, and digging a wooden box bodyThe top throwing port is sealed by nylon mesh cloth to prevent termites or ants from escaping; then 30 adult termites and 50 ants are put into the box body, the test result is checked after 24 hours, the test is repeated three times, the insecticidal effect is consistent, and the death rates of the termites and the ants are both 100%.

Table 3 several resistance paint raw materials using the same rubber powder ratio of 5% -15% and weight ratios:

raw materials	Comparative example 1	Comparative example 2
			Aqueous emulsion	30	44.8
Inorganic filler	45.1	19
			Wood fiber	5	-
Rubber powder (80 mesh)	-	31
			Water (W)	15	10
Functional auxiliary agent	4.9	5.2

In the comparative examples shown in the table, no rubber powder or rubber powder having a single particle size was used, and in addition, the damping coefficient of comparative example 1 at room temperature of 20 ℃ was 0.224, and the damping coefficient of comparative example 2 at room temperature was 0.1 to 0.4.

Note: 1. termite resistance is according to national Standard, GB/T18260-2015.

2. The damping coefficient is referred to national standard, GB/T18258-2000, DMA thermal analysis method.

The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A damping paint for termite resistance comprising:

the carrier in the microcapsule emulsion containing the insecticide is fly ash;

the microcapsule suspension is a suspension with chrysanthemic chloride ester and phoxim insecticide as capsule cores and paraphthaloyl chloride and ethylenediamine as capsule walls, wherein the mass ratio of the capsule cores to the capsule walls is 1:4;

the matrix resin is selected from one or more of styrene-acrylic, pure acrylic and VAE emulsion;

the waste rubber powder is selected from 40-50 meshes, 60-90 meshes and 100-150 meshes of gradation, and the mass ratio is (1-2): (3-5): (1-3);

the preparation method of the microcapsule suspension containing the insecticide comprises the following steps:

mixing protective colloid, emulsifier, water and alkali liquor to obtain a mixed water phase;

mixing fly ash, chrysanthemums, phoxim, terephthaloyl chloride and an organic solvent to obtain a mixed organic phase;

and emulsifying the mixed organic phase and the mixed water phase, and then adding an ethylenediamine aqueous solution to perform interfacial polymerization reaction to obtain the microcapsule suspension containing the pesticide.

2. The damping paint as claimed in claim 1, further comprising a functional additive, wherein the functional additive comprises 0.1-1 wt% of a dispersant, 0.5-1.5 wt% of a defoamer, 1-5 wt% of a phosphorus flame retardant, 0.5-5 wt% of a film forming additive, and 0.5-1 wt% of a bactericide based on the damping paint.

3. The damping paint of claim 1, wherein the inorganic filler is selected from ground CaCO ₃ One or more of talc and graphite.

4. The damping paint as claimed in claim 1, wherein the wood fiber has a particle size of 15-200 μm.

5. The damping paint according to claim 1, wherein the protective colloid is polyvinyl alcohol and the emulsifier is OP-10.

6. The damping paint as claimed in claim 1, wherein the preparation method of the damping paint is specifically as follows:

mixing inorganic filler, water, wood fiber, waste rubber powder and matrix resin according to the weight ratio to obtain damping coating emulsion;

and mixing the damping coating emulsion and the microcapsule suspension containing the insecticide to obtain the damping coating.

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