The temperature of the mosquito-type mosquito-repellent incense is 700 °C, and the temperature on the mosquito-repellent incense is about 160-170 °C at about 6-8 mm behind the burning point, which is suitable for the volatilization of the insecticidal active ingredients and flavors. As the coiled mosquito coils continue to burn, the temperature point moves continuously, which ensures the stability of the drug's swing temperature and the amount of evaporation.
The electric mosquito coil is the basic principle of using the mosquito coil. The volatilization temperature of the drug is set in the range of 160-170 °C, and then the temperature of the PTCP component is automatically adjusted to replace the combustion heat with electric heating to ensure that The drug volatilization temperature and the amount of volatilization are stable.
The electric mosquito coil is composed of two parts: a mosquito repellent tablet and an electric heater. The mosquito repellent tablet refers to a special paper sheet impregnated with a certain amount of mosquito repellent liquid, generally a 23×35×2.8 mm raw paper sheet, usually containing 10 mg of stabilizer ( BHT), 20mg of synergistic ether, appropriate amount of flavor, insecticidal active ingredients vary by species, such as 40mg dextromethrin, 20mg Es-biomethrin, 15mgd-trans furthrin; electric heater is using PTCR resistor The heat generated is transferred to the heat conducting plate of the electric heater through the heat transfer device, and the temperature of the heat conducting plate is automatically adjusted to be heated with the temperature of the PTCR resistor, and the temperature is maintained between 160-170 ° C, which is exactly Repellent requirements for drugs and fragrances in mosquito repellent tablets. When the mosquito repellent sheet is horizontally placed on the heat conducting plate, the medicine impregnated in the mosquito repellent sheet and the fragrance begin to vaguely and evenly volatilize. Of course, the amount of the liquid immersed in the mosquito repellent sheet and the volatilization speed must fully take into account 8-12 Hours are responsible for the killing and killing of mosquitoes, and the fragrance should be evenly distributed during this time.
The development of electric mosquito repellent tablets has reached its peak in China since the late 1980s and in the early 1990s. Because of the use of electric mosquito repellent tablets, no smoke appears, and it is very clean, so it is favored by consumers. However, the electric mosquito repellent sheet also has its disadvantageous side, that is, since the evaporation amount of the active ingredient of the insecticide in the electric mosquito repellent sheet is uneven during use, the mosquito repellent effect is different. In general, the early evaporation effect is poor. Therefore, a certain amount of volatile regulator must be added to the electrothermal mosquito repellent drip formulation to adjust the evaporation of the active ingredients during different periods of use to achieve a more uniform evaporation. However, the effect in the electrothermal mosquito repellent is not only related to the type, dosage and formulation of the active ingredients of the insecticide used, but also related to the heating temperature of the electric heater and its design, because the temperature is too low and the active ingredient is During the use period, it cannot be completely evaporated, and some parts remain in the paper, so that the mosquito repellent effect should not be achieved. On the other hand, if the temperature is too high, the amount of evaporation is too large, so that the effect of mosquito repellent is significantly reduced in the later stage of use. It is also necessary to have a good air flow gap in the design so that the active ingredient can be easily carried into the space by the air flow.
In addition to insecticidal active ingredients, synergists, stabilizers, flavors and solvents, the electric mosquito repellent stock solution also contains a volatile regulator and a special dye. The function of the volatile regulator is to control the insecticidal active ingredient to be uniformly volatilized within the prescribed action time. The function of the special dye is to judge whether the tablet can be used according to the color of the cardboard when the active ingredient of the insecticide gradually evaporates until it disappears.
