CN106793232B - Forming method of microwave oven or oven cavity - Google Patents

Abstract

The invention discloses a method for forming a cavity of a microwave oven or an oven, which comprises the following steps: preparing a sheet: surface treatment of the sheet: welding, forming and spraying powder ceramic paint; the invention adopts the mode of preparing rough sand surface of sheet material and then welding and forming and then spraying ceramic paint, which can ensure that the cavity is not deformed and obtain a low-energy-consumption, high-strength and high-temperature-resistant non-staining and easily-cleaned ceramic coating.

Description

Forming method of microwave oven or oven cavity

Technical Field

The invention belongs to the field of cavity processing, and particularly relates to a method for forming a cavity of a microwave oven or an oven.

Background

Most of the traditional forming methods for microwave oven or oven cavities are to spray enamel coating or Teflon coating on the surface of the alloy cavity, however, the enamel coating needs to be baked at a high temperature of more than 800 ℃, cavity deformation and huge energy consumption are easily caused due to thermal expansion and cold contraction, and the Teflon coating has a heat-resistant temperature of about 250 ℃, can decompose toxic fluorine-containing gas under a high-temperature environment, and cause great harm to human health, so in order to improve the defects, the forming method for the cavity needs to be continuously improved.

Disclosure of Invention

The present invention is directed to a method for forming a cavity of a microwave oven or a toaster.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for forming a cavity of a microwave oven or a baking oven comprises the following steps:

(1) preparing a sheet: selecting and preparing a sheet according to the thickness of the forming cavity, wherein the sheet is a common iron plate, an aluminum-plated plate or a cold-rolled plate;

(2) firstly, carrying out sand blasting treatment on the surface, wherein the pressure of the sand blasting treatment is 0.5-0.7MPa, the grain size of sand materials is 60-120 meshes, and then cleaning and packaging the sand materials into sheets or coiled materials;

(3) cutting, bending and shallow stretching a sheet or a coiled material, and then welding and forming;

(4) degreasing, cleaning, drying, spraying ceramic paint, heating and curing at the curing temperature of 220-280 ℃, wherein the ceramic paint is prepared from the following raw materials in parts by weight:

3-5 parts of silicon carbide, 80-100 parts of ethyl orthosilicate, 20-30 parts of boron nitride, 10-12 parts of inorganic toner, 0.5-1 part of polyacrylamide, 0.7-2 parts of silane coupling agent Kh5600.1-0.2 part of isopropyl tri (dioctyl pyrophosphoryl oxy) titanate, 0.7-1 part of butyl tin mercaptide, 2-3 parts of nylon acid methyl ester, 1-2 parts of calcium ricinoleate, 16-17 parts of rosin alcohol, 3-5 parts of maleic anhydride and 0.01-0.02 part of divinylbenzene;

the preparation method of the ceramic coating comprises the following steps:

adding the isopropyl tri (dioctyl pyrophosphato acyloxy) titanate into abienol, uniformly stirring, adding the calcium ricinoleate, raising the temperature to 70-75 ℃, keeping the temperature and stirring for 10-20 minutes to obtain an alcohol dispersion liquid;

mixing the maleic anhydride and the polyacrylamide, adding the mixture into deionized water with the weight of 70-80 times that of the mixture, uniformly stirring, adding the tetraethoxysilane, raising the temperature to 60-70 ℃, adding the alcohol dispersion, dropwise adding ammonia water with the concentration of 10-13%, adjusting the pH to 10-12, and stirring for 50-60 minutes under heat preservation to obtain high-molecular silicon dioxide sol;

adding the butyltin mercaptide into an 80-95% ethanol solution which is 37-40 times of the weight of the butyltin mercaptide, uniformly stirring, adding the high-molecular silica sol and divinylbenzene, uniformly stirring, introducing nitrogen, raising the temperature to 70-75 ℃, carrying out heat preservation reaction for 2-3 hours, adding the silane coupling agent Kh560, carrying out ultrasonic treatment for 10-20 minutes, mixing with the rest raw materials, carrying out sealed stirring for 5-6 hours at 400-500 r/min, then carrying out calcination at the microwave sintering condition of 1150-1200 ℃ and the heating rate of 30-35 ℃/min, carrying out heat preservation for 10-15 minutes at the highest sintering temperature, cooling and grinding into fine powder to obtain the ceramic coating.

If the sheet or the coiled material is cut, bent, slightly stretched and welded into a microwave oven or an oven cavity for molding, sanding easily causes cavity deformation and sand grains clamped in a cavity crack and fall off during spraying and drying, so that a ceramic coating is poor, and the reject ratio is extremely high.

The invention has the advantages that:

the invention adopts the mode of preparing rough sand surface of sheet material and then welding and forming and then spraying ceramic paint, which can ensure that the cavity is not deformed and obtain a low-energy-consumption, high-strength and high-temperature-resistant non-staining and easily-cleaned ceramic coating.

Detailed Description

A method for forming a cavity of a microwave oven or a baking oven comprises the following steps:

(1) preparing a sheet: selecting and preparing a sheet according to the thickness of the forming cavity, wherein the sheet is a common iron plate, an aluminum-plated plate or a cold-rolled plate;

(2) firstly, carrying out sand blasting treatment on the surface, wherein the pressure of the sand blasting treatment is 0.7MPa, the grain size of sand materials is 60-120 meshes, and then cleaning and packaging the sand materials into sheets or coiled materials;

(3) cutting, bending and shallow stretching a sheet or a coiled material, and then welding and forming;

(4) degreasing, cleaning, drying, spraying ceramic paint, heating and curing at 280 ℃, wherein the ceramic paint is prepared from the following raw materials in parts by weight:

silicon carbide 3, tetraethoxysilane 100, boron nitride 30, inorganic toner 12, polyacrylamide 0.5, silane coupling agent Kh5600.7, isopropyl tris (dioctyl pyrophosphato acyloxy) titanate 0.2, butyltin mercaptide 0.7, methyl nylon acid 2, calcium ricinoleate 1, abietyl alcohol 17, maleic anhydride 3 and divinylbenzene 0.01;

the preparation method of the ceramic coating comprises the following steps:

adding the isopropyl tri (dioctyl pyrophosphato acyloxy) titanate into abienol, uniformly stirring, adding the calcium ricinoleate, raising the temperature to 75 ℃, keeping the temperature and stirring for 20 minutes to obtain an alcohol dispersion liquid;

mixing the maleic anhydride and the polyacrylamide, adding the mixture into deionized water with the weight being 80 times that of the mixture, uniformly stirring, adding the tetraethoxysilane, raising the temperature to 70 ℃, adding the alcohol dispersion, dropwise adding ammonia water with the concentration of 13%, adjusting the pH value to 12, and stirring for 60 minutes under the condition of heat preservation to obtain high-molecular silicon dioxide sol;

adding the butyltin mercaptide into a 95% ethanol solution 40 times the weight of the butyltin mercaptide, uniformly stirring, adding the high-molecular silica sol and divinylbenzene, uniformly stirring, introducing nitrogen, raising the temperature to 70-75 ℃, carrying out heat preservation reaction for 3 hours, adding the silane coupling agent Kh560, carrying out ultrasonic treatment for 10-20 minutes, mixing with the rest raw materials, carrying out sealed stirring at 500 revolutions per minute for 6 hours, filtering, calcining the precipitate at the microwave sintering condition of 1200 ℃ and the heating rate of 30 ℃/min, carrying out heat preservation at the highest sintering temperature for 15 minutes, cooling and grinding into fine powder to obtain the ceramic coating.

Claims (1)

1. A method for forming a cavity of a microwave oven or a baking oven is characterized by comprising the following steps:

(1) preparing a sheet: selecting and preparing a sheet according to the thickness of the forming cavity, wherein the sheet is a common iron plate, an aluminum-plated plate or a cold-rolled plate;

(2) firstly, carrying out sand blasting treatment on the surface, wherein the pressure of the sand blasting treatment is 0.5-0.7MPa, the grain size of sand materials is 60-120 meshes, and then cleaning and packaging the sand materials into sheets or coiled materials;

(3) cutting, bending and shallow stretching a sheet or a coiled material, and then welding and forming;

(4) degreasing, cleaning, drying, spraying ceramic coating, heating and curing at the curing temperature of 220-280 ℃;

the ceramic coating is prepared from the following raw materials in parts by weight:

3-5 parts of silicon carbide, 80-100 parts of ethyl orthosilicate, 20-30 parts of boron nitride, 10-12 parts of inorganic toner, 0.5-1 part of polyacrylamide, 0.7-2 parts of silane coupling agent Kh5600.1-0.2 part of isopropyl tri (dioctyl pyrophosphoryl oxy) titanate, 0.7-1 part of butyl tin mercaptide, 2-3 parts of nylon acid methyl ester, 1-2 parts of calcium ricinoleate, 16-17 parts of rosin alcohol, 3-5 parts of maleic anhydride and 0.01-0.02 part of divinylbenzene;

the preparation method of the ceramic coating comprises the following steps:

adding the isopropyl tri (dioctyl pyrophosphato acyloxy) titanate into abienol, uniformly stirring, adding the calcium ricinoleate, raising the temperature to 70-75 ℃, keeping the temperature and stirring for 10-20 minutes to obtain an alcohol dispersion liquid;

mixing the maleic anhydride and the polyacrylamide, adding the mixture into deionized water with the weight of 70-80 times that of the mixture, uniformly stirring, adding the tetraethoxysilane, raising the temperature to 60-70 ℃, adding the alcohol dispersion, dropwise adding ammonia water with the concentration of 10-13%, adjusting the pH to 10-12, and stirring for 50-60 minutes under heat preservation to obtain high-molecular silicon dioxide sol;

adding the butyltin mercaptide into an 80-95% ethanol solution which is 37-40 times of the weight of the butyltin mercaptide, uniformly stirring, adding the high-molecular silica sol and divinylbenzene, uniformly stirring, introducing nitrogen, raising the temperature to 70-75 ℃, carrying out heat preservation reaction for 2-3 hours, adding the silane coupling agent Kh560, carrying out ultrasonic treatment for 10-20 minutes, mixing with the rest raw materials, carrying out sealed stirring for 5-6 hours at 400-500 r/min, then carrying out calcination at the microwave sintering condition of 1150-1200 ℃ and the heating rate of 30-35 ℃/min, carrying out heat preservation for 10-15 minutes at the highest sintering temperature, cooling and grinding into fine powder to obtain the ceramic coating.