A long-lasting and sustained-release anti-cockroach lightweight ceramic plate and preparation method thereof

Abstract

The present invention belongs to the technical field of building ceramics, and specifically discloses a kind of cockroach-proof lightweight ceramic plate and its preparation method that can be long-term sustained release. The cockroach-proof lightweight ceramic plate includes a lightweight ceramic substrate and a resin layer, and the inner surface of the lightweight ceramic substrate has open pores, and the resin layer covers the outer surface of the lightweight ceramic substrate; the open pores contain fillers, and the fillers and the resin layer are all cockroach-proof functional materials; the cockroach-proof functional material raw material components, by weight, include: 75-99 parts of methyl methacrylate; 1-3 parts of cross-linking agent; 0.03-0.25 parts of initiator; 10-15 parts of porous silica microspheres; porous silica microspheres are loaded with cockroach-proof agents. The present invention fills the porous silica microspheres, methyl methacrylate monomer solution and other raw materials loaded with cockroach-proof agents into the open pores of lightweight ceramic substrates, and is polymerized step by step by heat treatment, so that the substrate surface is covered with a layer of resin layer with cockroach-proof effect, and the long-term sustained release effect of cockroach-proof agents is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of building ceramics, and in particular relates to a cockroach-proof lightweight ceramic plate capable of long-term sustained release and a preparation method thereof. Background Art

[0002] Cockroaches are common health pests. In most parts of China, especially in the area south of the Yangtze River, the rampant cockroaches have had a great impact on people's normal lives. Since cockroaches have strong survival and reproduction abilities, it is difficult to completely eliminate cockroaches with ordinary pest control methods. Ceramic panels are the main material for indoor and outdoor decoration. Combining cockroach repellent with ceramic panels can effectively utilize the advantages of the wide paving of ceramic panels. However, since there are too few pores on the surface of ordinary ceramic panels, they are not enough to load agents that can achieve long-term cockroach repellent effects. Even if lightweight bricks with a porous structure are used, the cockroach repellent will be released very quickly, and the effect of long-term sustained release cannot be achieved.

[0003] Therefore, there is an urgent need to develop a long-lasting sustained-release ceramic plate that can not only load more cockroach repellents but also achieve sustained and long-lasting release. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention proposes a cockroach-proof lightweight ceramic plate capable of long-term sustained release and a preparation method thereof. The present invention uses lightweight ceramic bricks as a substrate, and utilizes the large number of open pores on its surface to fill porous silica microspheres loaded with cockroach-proof agents, methyl methacrylate monomer solution and other raw materials into the open pores. Through heat treatment polymerization, the surface of the lightweight ceramic substrate is covered with a resin layer with cockroach-proof effects, thereby achieving a long-term sustained release effect of the cockroach-proof agent.

[0005] In order to solve the above technical problems, the first aspect of the present invention provides an anti-cockroach lightweight ceramic plate, comprising a lightweight ceramic substrate and a resin layer, wherein the inner surface of the lightweight ceramic substrate has open pores, and the resin layer covers the outer surface of the lightweight ceramic substrate; the open pores contain fillers, and the fillers and the resin layer are both anti-cockroach functional materials; the raw materials for preparing the anti-cockroach functional material include, by weight:

[0006]

[0007] The porous silicon oxide microspheres are loaded with a cockroach repellent.

[0008] Specifically, the present invention uses a lightweight ceramic tile with a low volume density as a substrate, and polishes the surface to have a large number of open pores. Compared with closed pores, the open pores can provide more space for accommodating cockroach repellents. At the same time, due to the presence of abundant open pores, the specific surface area of ​​the lightweight ceramic substrate is increased, which helps to improve the release efficiency of the loaded drug. The present invention increases the loading amount of the cockroach repellent by filling or coating the open pores of the lightweight ceramic substrate and its surface with a resin layer having cockroach repellent function, thereby extending the long-term release of the lightweight ceramic plate.

[0009] At the same time, the cockroach-proof functional material of the present invention uses methyl methacrylate as a monomer, and under the action of an initiator and a cross-linking agent, a polymerization reaction will occur to generate polymethyl methacrylate, and the polymerized material has a high surface hardness and cockroach-proof effect. The hardness of the polymethyl methacrylate layer after polymerization is high, which can cope with the damage caused by daily use in life, and effectively improves the use time and durability of the cockroach-proof drug effect. At the same time, the cockroach-proof functional material of the present invention also needs to meet the above-mentioned specific component requirements to achieve the best material strength and long-term cockroach-proof effect. Specifically, methyl methacrylate, as a monomer, is the main body of the resin material after polymerization, and too low a dosage will be unfavorable for the strength of the resin material after polymerization. The cross-linking agent is mainly used for the cross-linking of the methyl methacrylate monomer. Insufficient dosage of the cross-linking agent will result in a low degree of cross-linking, and the molecular spatial structure is mainly a two-dimensional chain structure, which is also unfavorable for the strength of the material; if the dosage of the cross-linking agent is too high, the degree of cross-linking will rise, which is conducive to improving the strength and surface hardness of the material, but also increases the brittleness of the material accordingly. The initiator is a catalyst that triggers the polymerization reaction. If the initiator is used in too high a dosage, it is easy to cause explosion and reduce the strength of the material. If the initiator is used in insufficient dosage, it is easy to cause incomplete polymerization reaction, thereby causing the methyl methacrylate monomer and cross-linking agent to overflow, which not only affects the strength of the material, but the overflowed unreacted monomer and cross-linking agent can also easily cause pollution.

[0010] In addition, porous silica microspheres are added to the cockroach-proof functional material of the present invention, and the porous silica microspheres are loaded with cockroach-proof agents. The porous silica microspheres, as slow-release channels, can release the cockroach-proof agents to the maximum extent, and the cockroach-proof agents are present in the porous channels, which is conducive to the slow release of the cockroach-proof agents, thereby extending the service life of the cockroach-proof function of the lightweight ceramic plate and achieving a long-term slow-release effect. And porous silica, as an inorganic filler particle, is conducive to improving the mechanical strength and service life of the resin layer.

[0011] As a further improvement of the above solution, the diameter of the porous silica microspheres is 3-6 μm.

[0012] Specifically, the porous silica microspheres have a large number of interconnected microchannels inside, which are beneficial to the loading of the cockroach repellent on one hand, and also contribute to the slow release of the cockroach repellent on the other hand.

[0013] Preferably, the amount of the cockroach repellent loaded in the porous silica microspheres is 2-4 parts, that is, the amount of the cockroach repellent loaded in 10-15 parts by weight of the porous silica microspheres is 2-4 parts by weight.

[0014] As a further improvement of the above solution, the volume density of the lightweight ceramic matrix is ​​0.3-1.4 g / cm 3 .

[0015] Specifically, the bulk density is less than 1.4 g / cm 3 The lightweight porous ceramic matrix contains a large number of tiny open pores after surface polishing, which is beneficial to increase the specific surface area of ​​the lightweight ceramic matrix, provide more accommodation space for the cockroach repellent, and thus improve the release efficiency of the drug.

[0016] As a further improvement of the above scheme, the cockroach repellent is selected from at least one of lemon essential oil, peppermint essential oil, camphor essential oil, rosemary essential oil, eucalyptus essential oil, artemisia annua essential oil, catnip essential oil and lemongrass essential oil.

[0017] Specifically, these cockroach repellents are all natural plant essential oils, which are safer and healthier than pyrethroid cockroach repellents, but they also have a good repellent effect on cockroaches. These plant essential oils with repellent effects are dispersed in porous silica microspheres to form cockroach repellents with long-lasting sustained release.

[0018] Preferably, the cockroach repellent needs to be fully dried by adding anhydrous magnesium sulfate or anhydrous calcium sulfate before use, and the drying time depends on the water content of methyl methacrylate and is not less than 6 hours, and finally purified by reduced pressure distillation. The purpose of drying is to remove trace amounts of water in the cockroach repellent, which may lead to incomplete reaction and thus affect the material properties. The purpose of distillation purification is to remove the desiccant anhydrous magnesium sulfate or anhydrous calcium sulfate used.

[0019] Preferably, the cross-linking agent is selected from at least one of divinylbenzene, diallyl terephthalate, diallyl isophthalate, diallyl phthalate, and isoprene.

[0020] Preferably, the initiator is selected from at least one of azobisisobutyronitrile, azobisisoheptanenitrile, diacyl peroxide and potassium persulfate.

[0021] Preferably, the purity of the methyl methacrylate is not less than 98%. High-purity methyl methacrylate is more conducive to the polymerization reaction, and impurities will affect the progress of the polymerization reaction and make the initiator inactive.

[0022] The second aspect of the present invention provides a method for preparing a cockroach-proof and anti-light ceramic plate, the method being used to prepare the cockroach-proof and anti-light ceramic plate according to the first aspect of the present invention, comprising the following steps:

[0023] (1) placing porous silica microspheres in a cockroach repellent, heating, and filtering to obtain porous silica microspheres loaded with the cockroach repellent;

[0024] (2) mixing part of methyl methacrylate with part of initiator, heating once to dissolve the initiator; heating again to initiate polymerization; after cooling, mixing the remaining methyl methacrylate, the remaining initiator, the cross-linking agent and the porous silica microspheres loaded with the cockroach repellent prepared in step (1), and degassing to obtain a mixed slurry;

[0025] (3) Applying the mixed slurry obtained in step (2) to the surface of the lightweight ceramic substrate and performing heat treatment to obtain the cockroach-proof lightweight ceramic board.

[0026] Specifically, the methyl methacrylate of the present invention adopts step-by-step reaction polymerization, and through pre-partial polymerization, the system first forms a skeleton structure with a certain degree of polymerization, which can effectively prevent the porous silica microspheres from forming agglomerates and affecting the stable progress of the polymerization reaction. At the same time, the mixed slurry is applied to the surface of the lightweight ceramic substrate and then heat-treated, and directly polymerized on the surface of the lightweight ceramic substrate to form a resin layer with an anti-cockroach effect, which is more conducive to the combination of the resin and the lightweight ceramic substrate, and can effectively prevent the resin layer from falling off.

[0027] Preferably, in step (1), the heating temperature is 50-60° C. and the heating time is 0.5-1 hour.

[0028] Preferably, in step (2), the temperature is raised to 35-55°C for the first time and to 85-95°C for the second time.

[0029] Preferably, in step (2), the condition for stopping the heating after the second heating is that the viscosity of the reaction liquid is 800-1000 mPa·S at room temperature.

[0030] Preferably, in step (2), the mass ratio of the amount of methyl methacrylate added twice is 1:(6.5-8.9); the mass ratio of the amount of initiator added twice is 1:(2-24).

[0031] Preferably, in step (2), the degassing is performed by vacuum degassing, and the time of the vacuum degassing is 10-50 minutes.

[0032] Preferably, in step (3), the process conditions of the heat treatment are: first heating to 50-70°C and keeping warm for 2-6 hours; then heating to 100-120°C and keeping warm for another 2-6 hours.

[0033] Preferably, in step (3), the amount of the mixed slurry applied is 150-180 g / m 2 .

[0034] Compared with the prior art, the above technical solution of the present invention has at least the following technical effects or advantages:

[0035] (1) The present invention uses a lightweight ceramic tile with a large number of open pores on the surface as a substrate to increase the specific surface area of ​​the substrate and provide more space for accommodating cockroach repellent, which is beneficial to improving the release efficiency of the loaded drug; and fills or coats the open pores of the lightweight ceramic substrate and its surface with a resin layer having an anti-cockroach function to increase the loading amount of the anti-cockroach agent, thereby extending the long-term release of the lightweight ceramic plate.

[0036] (2) The cockroach-proof functional material of the present invention uses methyl methacrylate as a monomer. Under the action of an initiator and a cross-linking agent, a polymerization reaction will occur to generate polymethyl methacrylate. The polymer material has a high surface hardness and cockroach-proof effect, which effectively improves the use time and durability of the cockroach-proof drug. At the same time, porous silica microspheres loaded with cockroach-proof agents are added to achieve slow release of the cockroach-proof agents.

[0037] (3) The methyl methacrylate of the present invention is polymerized by a step-by-step reaction, so that the system first forms a uniform skeleton structure with a certain degree of polymerization to ensure the stable progress of the polymerization reaction; and directly polymerizes on the surface of the lightweight ceramic substrate to form a resin layer with an anti-cockroach effect, so as to achieve a firm bond between the resin and the lightweight ceramic substrate.

[0038] (4) The lightweight ceramic plate prepared by the present invention not only has high surface strength, but also has excellent long-lasting slow-release cockroach-proof performance, and can achieve a good cockroach-proof effect for at least 6 months. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of the surface hydrophobic ceramic of the present invention.

[0040] In the figure: 100 represents a lightweight ceramic substrate; 200 represents open pores; and 300 represents a resin layer. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with the examples, so that the technical personnel of the relevant technical field can understand the present invention. It is necessary to point out here that the examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. The non-essential improvements and adjustments made to the present invention by the skilled person in the relevant field according to the above invention content should still belong to the scope of protection of the present invention. At the same time, the raw materials mentioned below that are not described in detail are all commercially available products; the process steps or preparation methods that are not mentioned in detail are all process steps or preparation methods known to those skilled in the art.

[0042] like Figure 1As shown, the anti-cockroach lightweight ceramic plate of the present invention comprises a lightweight ceramic substrate 100 and a resin layer 300.

[0043] The inner surface of the ceramic substrate 100 has open pores 200, and the resin layer 300 covers the outer surface of the lightweight ceramic substrate 100; the open pores 200 contain fillers, and both the fillers and the resin layer 300 are cockroach-proof functional materials.

[0044] The lightweight ceramic substrates 100 of the following embodiments and comparative examples are all selected from surface-polished lightweight ceramic tiles.

[0045] Example 1

[0046] A cockroach-proof lightweight ceramic plate, comprising a volume density of 1.4 g / cm 3 The lightweight ceramic matrix has an inner surface with open pores, the open pores contain fillers, and the outer surface of the lightweight ceramic matrix is ​​covered with a resin layer, and both the filler and the resin layer are cockroach-proof functional materials.

[0047] By weight, the raw material components of the cockroach-proof functional material include:

[0048]

[0049] Wherein: the porous silica microspheres are loaded with lemon essential oil, the loading amount of the lemon essential oil is 2 parts; the diameter of the porous silica microspheres is 3 μm.

[0050] A method for preparing a cockroach-proof lightweight ceramic plate comprises the following steps:

[0051] (1) adding 10 parts by weight of porous silica microspheres to lemon essential oil, heating to 60° C., stirring for 0.5 hour, then filtering, and cooling to room temperature to obtain porous silica microspheres loaded with lemon essential oil;

[0052] (2) 20 parts by weight of methyl methacrylate and 0.01 parts by weight of azobisisobutyronitrile were mixed at 35° C. to fully dissolve the azobisisobutyronitrile, and then placed in a reactor to heat and initiate a polymerization reaction. The reaction temperature was set to 95° C. When the viscosity of the reaction liquid reached 800 mPa.s (at 25° C.), heating was stopped and the reaction liquid was allowed to cool naturally. The remaining 55 parts by weight of methyl methacrylate, the remaining 0.02 parts by weight of azobisisobutyronitrile, divinylbenzene, and the porous silica microspheres loaded with lemon essential oil obtained in step (1) were added to the above reactor, and after continuing to stir evenly, vacuum degassing was performed for 20 minutes to obtain a mixed slurry.

[0053] (3) Apply the mixed slurry obtained in step (2) at a coating amount of 150 g / m 2Apply evenly to the surface of the lightweight ceramic substrate, set the reaction temperature to 55°C, heat the reaction for 2 hours, then increase the reaction temperature to 120°C, continue the reaction for 3 hours, and cool to room temperature after the reaction to obtain the cockroach-proof lightweight ceramic plate of this embodiment.

[0054] Example 2

[0055] A cockroach-proof lightweight ceramic plate, comprising a volume density of 0.3 g / cm 3 The lightweight ceramic matrix has an inner surface with open pores, the open pores contain fillers, and the outer surface of the lightweight ceramic matrix is ​​covered with a resin layer, and both the filler and the resin layer are cockroach-proof functional materials.

[0056] By weight, the raw material components of the cockroach-proof functional material include:

[0057]

[0058]

[0059] Wherein: the porous silica microspheres are loaded with mint essential oil, and the loading amount of the mint essential oil is 4 parts; and the diameter of the porous silica microspheres is 3 μm.

[0060] A method for preparing a cockroach-proof lightweight ceramic plate comprises the following steps:

[0061] (1) adding porous silica microspheres to mint essential oil, heating to 50° C., stirring for 1 hour, then filtering, and cooling to room temperature to obtain porous silica microspheres loaded with mint essential oil;

[0062] (2) 19 parts by weight of methyl methacrylate and 0.05 parts by weight of diacyl peroxide were mixed at 55° C. to fully dissolve the azobisisobutyronitrile, and then placed in a reactor to heat and initiate a polymerization reaction. The reaction temperature was set to 85° C. When the viscosity of the reaction liquid reached 1000 mPa.s (at 25° C.), heating was stopped and the reaction liquid was allowed to cool naturally. 80.00 parts by weight of methyl methacrylate, 0.2 parts by weight of diacyl peroxide, diallyl terephthalate, and the porous silica microspheres loaded with mint essential oil obtained in step (1) were added to the above reactor, stirred evenly, and vacuum degassed for 50 minutes to obtain a mixed slurry.

[0063] (3) Apply the mixed slurry obtained in step (2) at a coating amount of 180 g / m 2 Apply evenly to the surface of the lightweight ceramic substrate, set the reaction temperature to 70°C, heat the reaction for 4 hours, then increase the reaction temperature to 100°C, continue the reaction for 6 hours, and cool to room temperature after the reaction to obtain the cockroach-proof lightweight ceramic plate of this embodiment.

[0064] Example 3

[0065] A cockroach-proof lightweight ceramic plate, comprising a volume density of 1.0 g / cm 3 The lightweight ceramic matrix has an inner surface with open pores, the open pores contain fillers, and the outer surface of the lightweight ceramic matrix is ​​covered with a resin layer, and both the filler and the resin layer are cockroach-proof functional materials.

[0066] By weight, the raw material components of the cockroach-proof functional material include:

[0067]

[0068] Wherein: the porous silicon oxide microspheres are loaded with camphor essential oil, and the loading amount of the camphor essential oil is 3 parts; and the diameter of the porous silicon oxide microspheres is 5 μm.

[0069] A method for preparing a cockroach-proof lightweight ceramic plate comprises the following steps:

[0070] (1) adding porous silica microspheres to camphor essential oil, heating to 55° C., stirring for 1 hour, then filtering, and cooling to room temperature to obtain porous silica microspheres loaded with camphor essential oil;

[0071] (2) 15 parts by weight of methyl methacrylate and 0.03 parts by weight of potassium persulfate were mixed at 40° C. to fully dissolve azobisisobutyronitrile, and then placed in a reactor and heated to initiate a polymerization reaction. The reaction temperature was set to 90° C. When the viscosity of the reaction liquid reached 900 mPa.s (at 25° C.), heating was stopped and the reaction liquid was allowed to cool naturally. The remaining 65 parts by weight of methyl methacrylate, the remaining 0.01 parts by weight of potassium persulfate, diallyl terephthalate, and the porous silica microspheres loaded with camphor essential oil obtained in step (1) were added to the above reactor, and after continuing to stir evenly, vacuum degassing was performed for 30 minutes to obtain a mixed slurry.

[0072] (3) Apply the mixed slurry obtained in step (2) at a coating amount of 165 g / m 2 Apply evenly to the surface of the lightweight ceramic substrate, set the reaction temperature to 55°C, heat the reaction for 3 hours, then increase the reaction temperature to 100°C, continue the reaction for 6 hours, and cool to room temperature after the reaction to obtain the cockroach-proof lightweight ceramic plate of this embodiment.

[0073] Example 4

[0074] A cockroach-proof lightweight ceramic plate, comprising a volume density of 0.8 g / cm 3 The lightweight ceramic matrix has an inner surface with open pores, the open pores contain fillers, and the outer surface of the lightweight ceramic matrix is ​​covered with a resin layer, and both the filler and the resin layer are cockroach-proof functional materials.

[0075] By weight, the raw material components of the cockroach-proof functional material include:

[0076]

[0077] Wherein: the porous silica microspheres are loaded with lemongrass essential oil, the loading amount of the lemongrass essential oil is 2 parts; the diameter of the porous silica microspheres is 3 μm.

[0078] A method for preparing a cockroach-proof lightweight ceramic plate comprises the following steps:

[0079] (1) adding porous silica microspheres to lemongrass essential oil, heating to 60° C., stirring for 0.8 hours, then filtering, and cooling to room temperature to obtain porous silica microspheres loaded with lemongrass essential oil;

[0080] (2) 10 parts by weight of methyl methacrylate and 0.02 parts by weight of azobisisobutyronitrile were mixed at 55° C. to fully dissolve the azobisisobutyronitrile, and then placed in a reactor and heated to initiate a polymerization reaction. The reaction temperature was set to 85° C. When the viscosity of the reaction liquid reached 850 mPa.s (at 25° C.), heating was stopped and the reaction liquid was allowed to cool naturally. The remaining 70 parts by weight of methyl methacrylate, the remaining 0.08 parts by weight of azobisisobutyronitrile, isoprene, and the porous silica microspheres loaded with lemongrass essential oil obtained in step (1) were added to the above reactor, and after continuing to stir evenly, vacuum degassing was performed for 15 minutes to obtain a mixed slurry.

[0081] (3) Apply the mixed slurry obtained in step (2) at a coating amount of 155 g / m 2 Apply evenly to the surface of the lightweight ceramic substrate, set the reaction temperature to 65°C, heat the reaction for 6 hours, then increase the reaction temperature to 105°C, continue the reaction for 2.5 hours, and cool to room temperature after the reaction to obtain the cockroach-proof lightweight ceramic plate of this embodiment.

[0082] Example 5

[0083] The only difference between Example 5 and Example 4 is that the volume density of the lightweight ceramic matrix of Example 5 is 1.85 g / cm 3 Comparative Example 1

[0084] A lightweight ceramic plate, comprising a volume density of 0.8 g / cm 3 The lightweight ceramic matrix has an inner surface with open pores, the open pores contain fillers, and the outer surface of the lightweight ceramic matrix is ​​covered with a resin layer, and both the filler and the resin layer are cockroach-proof functional materials.

[0085] By weight, the raw material components of the cockroach-proof functional material include:

[0086]

[0087] Wherein: the porous silica microspheres are loaded with lemongrass essential oil, the loading amount of the lemongrass essential oil is 2 parts; the diameter of the porous silica microspheres is 3 μm.

[0088] A method for preparing a lightweight ceramic plate comprises the following steps:

[0089] (1) adding porous silica microspheres to lemongrass essential oil, heating to 60° C., stirring for 0.8 hours, then filtering, and cooling to room temperature to obtain porous silica microspheres loaded with lemongrass essential oil;

[0090] (2) adding methyl methacrylate, azobisisoheptanonitrile, crosslinking agent isoprene, and porous silica microspheres loaded with lemongrass essential oil obtained in step (1) to a reactor and mixing them uniformly at 55° C. to fully dissolve the azobisisoheptanonitrile, and then placing them in a reactor and heating to initiate a polymerization reaction. The reaction temperature is set to 85° C. When the viscosity of the reaction liquid reaches 850 mPa.s (at 25° C.), heating is stopped, vacuum degassing is performed for 15 minutes, and the reaction liquid is allowed to cool naturally to obtain a mixed slurry;

[0091] (3) Apply the mixed slurry obtained in step (2) at a coating amount of 155 g / m 2 Apply evenly to the surface of the lightweight ceramic substrate, set the reaction temperature to 65°C, heat the reaction for 6 hours, then increase the reaction temperature to 105°C, continue the reaction for 2.5 hours, and cool to room temperature after the reaction to obtain the lightweight ceramic plate of this comparative example.

[0092] Comparative Example 2

[0093] A lightweight ceramic plate, comprising a volume density of 0.8 g / cm 3 The lightweight ceramic matrix has an inner surface with open pores, the open pores contain fillers, and the outer surface of the lightweight ceramic matrix is ​​covered with a resin layer, and both the filler and the resin layer are cockroach-proof functional materials.

[0094] By weight, the raw material components of the cockroach-proof functional material include:

[0095]

[0096]

[0097] A method for preparing a lightweight ceramic plate comprises the following steps:

[0098] (1) 10 parts by weight of methyl methacrylate and 0.02 parts by weight of azobisisobutyronitrile were mixed at 55° C. to fully dissolve the azobisisobutyronitrile, and then placed in a reactor and heated to initiate a polymerization reaction. The reaction temperature was set to 85° C. When the viscosity of the reaction liquid reached 850 mPa.s (at 25° C.), heating was stopped and the reaction liquid was allowed to cool naturally. The remaining 70 parts by weight of methyl methacrylate, the remaining 0.08 parts by weight of azobisisobutyronitrile, isoprene, and lemongrass essential oil were added to the above reactor, and after continuing to stir evenly, vacuum degassing was performed for 15 minutes to obtain a mixed slurry.

[0099] (2) Apply the mixed slurry obtained in step (1) at a coating amount of 155 g / m 2 Apply evenly to the surface of the lightweight ceramic substrate, set the reaction temperature to 65°C, heat the reaction for 6 hours, then increase the reaction temperature to 105°C, continue the reaction for 2.5 hours, and cool to room temperature after the reaction to obtain the lightweight ceramic plate of this comparative example.

[0100] Performance Testing

[0101] 1. Surface strength

[0102] To test the surface strength of the lightweight ceramic plate samples prepared in Examples 1-5 and Comparative Examples 1-2, a metal ball with a mass of 100 g was released at a distance of 30 cm from the sample surface, with an initial velocity of zero and falling naturally. The impact point should be greater than 10 cm from the edge of the sample, and the distance between each test point and the center of the test point should be no less than 8 cm. Each sample was tested 10 times to evaluate the surface condition, and was evaluated as excellent, good, fair, or poor. The evaluation criteria are as follows:

[0103] Excellent: No impact cracks or pits on the surface;

[0104] Good: Slight pitting on the surface, no impact cracks;

[0105] General: Obvious pits or radial impact cracks appear on the surface;

[0106] Poor, with powdering, falling off, severe impact cracks and other conditions on the surface.

[0107] The test results are shown in Table 1.

[0108] Table 1: Comparison of surface strength tests of various embodiments and comparative examples

[0109] Serial number Surface strength Example 1 excellent Example 2 excellent Example 3 excellent Example 4 excellent Example 5 Difference Comparative Example 1 generally Comparative Example 2 good

[0110] As shown in Table 1, the surface strength evaluation results of the lightweight ceramic board samples prepared in Examples 1-4 are all excellent, while in Example 5, the volume density of its ceramic substrate is 1.85 g / cm 3The holes on the brick surface are small, and the amount of polymethyl methacrylate that penetrates into the surface micropores is small, and the surface is hit and the coating falls off. The difference between Comparative Example 1 and Example 4 is that Comparative Example 1 uses a single polymerization reaction without pre-polymerization, and the performance of the prepared resin layer material is unstable, and radial impact cracks are formed when the surface is hit; the difference between Comparative Example 2 and Example 4 is that Comparative Example 2 does not use porous silica microspheres as a carrier, and directly uses an equal amount of lemongrass essential oil as a cockroach repellent. Due to the lack of the filler effect of silica microspheres, the surface is hit and slight pits appear.

[0111] 2. Anti-cockroach performance

[0112] The cockroach-proofing performance of the long-acting slow-release cockroach-proof lightweight ceramic tile was tested by inhibiting cockroach activity, and the cockroach-proofing effects of Examples 1-5 and Comparative Examples 1-2 were tested. At the same time, in order to test the long-acting slow-release cockroach-proofing effect, all samples were placed for 6 months after preparation before testing. The test box and test method are as follows:

[0113] Sample preparation: Cut the samples prepared in Examples 1-5 and Comparative Examples 1-2 into sample blocks of 10×10 cm, and place 10 g of ground cockroach feed in the middle of the sample blocks.

[0114] Preparation of control samples: Cut the lightweight ceramic substrates used in Examples 1-5 and Comparative Examples 1-2 into 10×10 cm control sample blocks, and place 10 g of ground cockroach feed in the middle of the control sample blocks.

[0115] Test box: A self-made 150×150×150cm cube transparent acrylic box with ventilation holes on the top and 5×5cm openable and closable windows on the sides.

[0116] A sample and a corresponding control sample are grouped together and placed in a test box at the same time; different samples and control samples are placed in different test boxes for testing; during the test, a small amount of water is placed in the test box, and a shield is set for the test box; the window is closed, and the ambient temperature is set to 28°C and the humidity is set to 60%; 20 adult German cockroaches are placed in each test box, and each test lasts for 3 days. Finally, the remaining cockroach feed is weighed, and the sample / control sample ratio is calculated to measure the strength of the anti-cockroach performance. The larger the ratio, the better the cockroach repellent effect.

[0117] The measurement results are shown in Table 2.

[0118] Table 2: Comparative table of cockroach repellent effects of various embodiments and comparative examples

[0119]

[0120]

[0121] As shown in Table 2, the sample / control ratio of the lightweight ceramic plate samples prepared in Examples 1-4 was 5.6-7.5 after being placed for 6 months, indicating that they had a good long-term sustained release effect of repelling cockroaches. However, due to the dense structure of the substrate of Example 5, the long-term sustained release effect could not be achieved, and after long-term placement, the cockroach repelling effect was lower than that of Example 4; due to the unstable performance of the resin layer of Comparative Example 1, the cockroach repelling effect after long-term placement was also not as good as that of Example 4; Comparative Example 2 did not contain silica microspheres, and the release speed of the cockroach repellent was accelerated, and the sustained release effect could not be achieved, so the long-term cockroach repelling effect could not be achieved.

[0122] For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, without having to go through creative labor. Therefore, simple improvements made to the present invention by those skilled in the art based on the disclosure of the present invention should be within the protection scope of the present invention. The above embodiments are preferred embodiments of the present invention, and all processes similar to the present invention and equivalent changes made should belong to the protection scope of the present invention.

Claims

1. A cockroach-proof lightweight ceramic plate, characterized in that: It comprises a lightweight ceramic matrix and a resin layer, wherein the inner surface of the lightweight ceramic matrix has open pores, and the resin layer covers the outer surface of the lightweight ceramic matrix; The open pores contain fillers, and both the fillers and the resin layer are cockroach-proof functional materials; The raw material components of the cockroach-proof functional material include, by weight: 75-99 parts of methyl methacrylate; 1-3 parts of cross-linking agent; Initiator 0.03-0.25 parts; 10-15 parts of porous silica microspheres; The porous silicon oxide microspheres are loaded with a cockroach repellent; The diameter of the porous silica microspheres is 3-6 μm, and the loading amount of the cockroach repellent in the porous silica microspheres is 2-4 parts; The volume density of the lightweight ceramic matrix is ​​0.3-1.4 g / cm 3 ; The cockroach-proof lightweight ceramic plate is prepared by a preparation method comprising the following steps: (1) placing porous silica microspheres in a cockroach repellent, heating, and filtering to obtain porous silica microspheres loaded with the cockroach repellent; The heating temperature is 50-60°C and the heating time is 0.5-1 hour; (2) Mixing part of methyl methacrylate and part of initiator, heating the mixture to 35-55°C to dissolve the initiator, heating the mixture to 85-95°C to initiate polymerization reaction, cooling the mixture, mixing the remaining methyl methacrylate, the remaining initiator, the cross-linking agent and the porous silica microspheres loaded with the cockroach repellent prepared in step (1), and degassing the mixture to obtain a mixed slurry; (3) applying the mixed slurry obtained in step (2) to the surface of the lightweight ceramic substrate and performing heat treatment to obtain the cockroach-proof lightweight ceramic plate; The process conditions of the heat treatment are: first heating to 50-70° C. and keeping the temperature for 2-6 hours; then heating to 100-120° C. and keeping the temperature for another 2-6 hours.

2. The cockroach-proof lightweight ceramic plate according to claim 1, characterized in that: The cockroach repellent is selected from at least one of lemon essential oil, peppermint essential oil, camphor essential oil, rosemary essential oil, eucalyptus essential oil, artemisia annua essential oil, catnip essential oil and lemongrass essential oil.

3. The cockroach-proof lightweight ceramic plate according to claim 1, characterized in that: The cross-linking agent is selected from at least one of divinylbenzene, diallyl terephthalate, diallyl isophthalate, diallyl phthalate and isoprene.

4. The cockroach-proof lightweight ceramic plate according to claim 1, characterized in that: The initiator is selected from at least one of azobisisobutyronitrile, azobisisoheptanenitrile, diacyl peroxide and potassium persulfate.

5. The cockroach-proof lightweight ceramic plate according to claim 1, characterized in that: The purity of the methyl methacrylate is not less than 98%.

6. The cockroach-proof lightweight ceramic plate according to claim 1, characterized in that: In step (3), the amount of the mixed slurry applied is 150-180 g / m 2 .

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