Microwave cured artificial marble

Microwave cured artificial marble

Microwave curing artificial marble is the use of microwave irradiation to make it fast curing. More conventional curing speed, good uniformity, energy saving, has been used in a number of artificial marble decoration materials companies. The working effect is pretty good.
The microwave fixed-line function can shorten the curing time of artificial stone from 10 to 15 days in the traditional room temperature placement process to less than 1 hour. At the same time, it can significantly improve its mechanical strength and heat resistance. Silicon carbide as microwave sensitizer.

Artificial marble Processing.
(1) Mix vinylsilane, lower alcohol and deionized water evenly to obtain a mixed solution. The mass concentration of vinylsilane in the mixed solution is 3-8wt%, and the mass ratio of lower alcohol to deionized water is 2:1~6:1 , then adjust the pH of the mixed solution to 4~6 with glacial acetic acid, and stir the reaction at 25~40°C for 60~180min to obtain a silane hydrolysis solution; add silicon carbide to the silane hydrolysis solution, Stirring and reacting for 30-90 minutes under the same conditions, then standing still for 30-60 minutes, filtering to obtain modified silicon carbide particles, and then washing with absolute ethanol and deionized water for 2 to 3 times to remove excess vinyl silane on the surface of silicon carbide particles, Then place the modified silicon carbide particles in an oven at 50-80°C to heat and solidify for 30-60 minutes, and cool to room temperature for later using;

(2) mix marble particles and modified silicon carbide particles evenly to obtain aggregate, and the modified The mass of silicon carbide particles is 1 to 5% of the mass of marble particles, then add binder and additives to the aggregate and stir to form a mass, then inject it into the mold, and obtain uncured artificial stone by vacuum vibration pressing material; the artificial stone blocks include the following components in parts by weight: 70 to 90 parts of aggregate, 8 to 15 parts of binder, and 2 to 5 parts of auxiliary agent;

(3) the obtained in step (2) The artificial stone block is placed at a temperature of 55-70°C and solidified under microwave conditions for 15-30 minutes to obtain artificial stone. The frequency of the microwave machine is 915mhz, and the microwave power is 30-60kw;
the obtained artificial stone is placed at room temperature. After 1-2 days, it will be sawed and polished to obtain artificial stone products.

The principle of microwave action is that the material medium is organized by polar molecules and non-polar molecules, and under the action of electromagnetic fields, these polar molecules change from random distribution to orientation according to the direction of the electric field. Under the action of microwave electromagnetic fields, these orientation movements are constantly changing at a frequency of billions of times per second, resulting in intense movement and collision friction of molecules, thus generating heat, so that electrical energy is directly converted into heat energy in the medium.
The advantages of microwave heating are: fast heating speed, uniform heating, energy saving and high efficiency, easy to control, clean and sanitary, selective heating, safe and harmless.