Disclosure of Invention
The invention aims to provide a preparation method of blackboard glass, namely the blackboard glass prepared by the preparation method, which can ensure that the blackboard glass has good transmittance performance and can be written on the blackboard glass by chalk.
In order to achieve the purpose, the invention adopts the following technical scheme:
on the one hand, the preparation method of the blackboard glass is provided, the glass and the nanoscale anti-glare coating are provided, and the anti-glare coating is added at the concentration of 1.1-1.3kg/cm2The glass is sprayed with the atomized pressure, and the blackboard glass is prepared after curing treatment;
wherein, the anti-dazzle coating consists of a mixture of silicon dioxide, isopropanol, ethanol and propylene glycol monomethyl ether.
The anti-glare coating is in a powder initial state, the average particle size of the anti-glare coating is 15nm, the anti-glare coating needs to be adjusted into a liquid state before spraying, silicon dioxide, isopropanol, ethanol and propylene glycol methyl ether are indispensable components in the anti-glare coating, and the isopropanol, the ethanol and the propylene glycol methyl ether are used in a combined mode, so that the boiling point of the anti-glare coating can be effectively adjusted to control the secondary condensation time. The technical effects of the present invention cannot be achieved without either one component or both components.
In the present invention,the anti-dazzle coating is 1.1-1.3kg/cm2The glass is sprayed with the atomizing pressure, and a layer of micron-sized uneven particles is formed on the surface of the glass after solidification, so that the surface of the glass has a chalk writing function, slipping is prevented, and the transmittance of the blackboard glass can be prevented from being influenced; after curing, certain adhesive force is formed between silicon molecules in the glass and silicon molecules in the anti-glare coating, so that the connection stability between the anti-glare coating and the glass is ensured, the service life of the blackboard glass is prolonged, and the anti-glare coating enables the blackboard glass to have a good anti-glare effect. Compared with the prior art, the blackboard glass can be applied to a teaching all-in-one machine, can be used as a traditional blackboard in a power-off state, can be written by chalk, and can be used for displaying teaching in a power-on state.
Further, the anti-glare coating consists of the following components in parts by weight:
8-12 parts of silica, such as 8.1 parts, 8.2 parts, 8.3 parts, 8.4 parts, 8.5 parts, 8.8 parts, 9 parts, 9.2 parts, 9.5 parts, 10 parts, 10.5 parts, 11 parts, 11.5 parts and the like;
70-80 parts of isopropanol, such as 70.2 parts, 70.5 parts, 70.8 parts, 71 parts, 71.5 parts, 72 parts, 72.5 parts, 73 parts, 74 parts, 75 parts, 76 parts, 77 parts, 78 parts, 79 parts and the like;
8-12 parts of ethanol, such as 8.1 parts, 8.2 parts, 8.3 parts, 8.4 parts, 8.5 parts, 8.8 parts, 9 parts, 9.2 parts, 9.5 parts, 10 parts, 10.5 parts, 11 parts, 11.5 parts and the like;
propylene glycol methyl ether 4-6 parts, such as 4.1 parts, 4.2 parts, 4.3 parts, 4.4 parts, 4.5 parts, 4.7 parts, 4.9 parts, 5 parts, 5.1 parts, 5.3 parts, 5.5 parts, 5.8 parts, etc.
The anti-glare coating can adopt the combination of any weight part of the components.
Preferably, the anti-glare coating consists of 10 parts by weight of silicon dioxide, 75 parts by weight of isopropanol, 10 parts by weight of ethanol and 5 parts by weight of propylene glycol methyl ether, and the surface roughness of the blackboard glass can reach 0.2-0.4um (the thickness of the anti-glare coating) so as to meet the writing condition of chalk and not influence the transmission filter of the blackboard glass.
Further onThe atomization pressure is 1.2kg/cm2。
Further, the anti-glare coating is sprayed on the surface of the glass by using three spray guns at the same time, wherein the flow rate of the three spray guns is 13-18mL/min, and preferably 15 mL/min.
Further, the distance between the three spray guns is 4-6cm, preferably 5 cm;
the distance between the nozzles of the three spray guns and the glass surface is 12-18cm, preferably 15 cm. The number, the spacing and the distance between the auxiliary spray guns and the blackboard are limited, so that the spraying effect is optimal, and the stability of the chalk writing performance and the transmittance of the blackboard glass can be improved for each production batch.
Further, the moving speed of the glass during the spraying process is 60 to 80cm/min, preferably 70cm/min, and thus the spraying time depends on the length of the glass.
Further, the curing treatment temperature is 180-220 ℃, and the curing time is 25-40 min.
Further, the temperature of the curing treatment was 200 ℃ and the curing time was 30 min.
On the other hand, the blackboard glass is prepared by the preparation method of the blackboard glass, and can replace protective toughened glass on the existing teaching all-in-one machine, so that the teaching all-in-one machine can realize the functions of displaying teaching and writing as a blackboard.
The invention has the beneficial effects that: the invention uses 1.1-1.3kg/cm of anti-dazzle coating2The glass is sprayed with the atomizing pressure, and a layer of micron-sized uneven particles is formed on the surface of the glass after solidification, so that the surface of the glass has a chalk writing function, slipping is prevented, and the transmittance of the blackboard glass can be prevented from being influenced; after curing, the silicon molecules in the glass and the silicon molecules in the anti-glare coating form a certain adhesive force so as to ensure the connection stability between the anti-glare coating and the glass and improve the service life of the blackboard glass. Compared with the prior art, the blackboard glass can be applied to a teaching all-in-one machine, can be used as a traditional blackboard in a power-off state, can be written by chalk and can be startedThe states can be used for display teaching.
Example 3
Mixing 11% silicon dioxide, 73% isopropanol, 12% ethanol, and 4% propylene glycol methyl ether to obtain nanometer powderThe grade AG coating was sprayed onto the glass surface by an automatic sprayer equipped with three high pressure atomizing spray guns, wherein the distance between the three spray guns was 4cm and the distance between the three spray guns and the glass surface was 13 cm. The flow rate of 3 spray guns is set to 14mL/min, and the atomization pressure is set to 1.1kg/cm2. During the spraying process, the glass moves forward at a constant speed of 63cm/min, and the spray gun does reciprocating uninterrupted motion, so that the liquid medicine sprayed on the surface of the glass is more uniform. After the spraying is finished, curing is carried out for 30min at 200 ℃.
FIG. 1 is an exploded view of blackboard glasses obtained in examples 1 to 3. As shown in fig. 1, the anti-glare coating 2 is sprayed on the surface of the glass 1 to form a blackboard glass.
The performance of the blackboard glass prepared in the embodiment 1-3 is detected, the glossiness of three blackboard glass samples is 50-80, the roughness is 0.2-0.4um, the transmittance is more than 88%, and the haze value is 6-20%, so that the blackboard glass can completely replace the protective toughened glass on the existing teaching all-in-one machine, and the teaching all-in-one machine has the functions of displaying teaching and writing by adopting chalk.
The above examples are only intended to illustrate the detailed process of the present invention, and the present invention is not limited to the above detailed process, i.e., it is not intended that the present invention necessarily depends on the above detailed process for its implementation. It is understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention and the addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.