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1. How is the bubble in the coating film generated? The bubble is a gas mixed into the coating and remains on the surface of the coating film to form a small bubble.
A. In the preparation of paint liquid, adding curing agent and blending agent, during the stirring process, the air entrainment caused by mechanical movement during the filtration process of the paint liquid.
B. During construction, a large amount of air will be entrained in the paint brush. When the brush is applied, it will remain in the wet film to form a bubble. The substrate is not flat, the substrate is loose, the void is filled with the paint liquid, and the air will form bubbles.
C. The gas released by the chemical reaction forms a bubble, such as moisture, the solvent does not contain moisture, the entrained water in the compressed air during painting, and the poor diluent contains a small amount of acid, alcohol, amine, etc., and the curing agent The reaction releases carbon dioxide gas to form a bubble.
Second, the bubble burst process: A, in the paint liquid, the rising speed of the bubble: V = kx (r2 / y)
(V: bubble rising speed k: constant r: bubble radius y: viscosity of paint liquid)
It can be seen that the larger the bubble, the faster the speed rises to the paint surface, the larger the paint liquid stick shop, and the slower the bubble rises.
B. The liquid discharge effect of vapor light: When the bubble rises to the surface of the paint liquid, the liquid flows to the lower side of the bubble, and the bubble wall gradually becomes thinner. When the thickness of the bubble wall is less than 10 nm, the bubble bursts.
C. The surface tension of the antifoaming agent is particularly low, which makes the bubble wall more easily thinned, and causes the bubble to be more easily broken.
D. Using a solvent with a low surface tension, it is not easy to generate bubbles.
E. During construction, the paint liquid is thin and the viscosity is low, and the formed bubble is easily broken.
Electric Mosquito Swatter
Electric mosquito swatter is a kind of small household appliance products, mainly used to kill mosquitoes, flies, moths and other insects. It through the electronic high voltage technology, the use of 1850V high voltage to effectively destroy these pests, has the advantages of practical, convenient, no chemical pollution, safety and health, so it is widely welcomed, become the summer best-selling small household appliances products. The electric mosquito bat is usually composed of three layers of metal mesh, the outer metal mesh and the middle layer are not directly connected, and maintain a certain distance. When the switch is pressed, the direct current in the battery passes through the oscillation circuit and the boost circuit, eventually reaching a high voltage above 2000 volts. This design allows the mosquito to be waved through the electrostatic field and electrical grid discharge to destroy the insect, without causing harm to the human body.
The main advantages of electric mosquito swatting include:
Efficient pest control: can kill a variety of insects in a short time, including mosquitoes, flies and moths.
Safety and health: the use of high voltage electricity instead of chemical agents, to avoid chemical pollution, more environmental protection and safety.
Portable and convenient: compact size, easy to carry and use, suitable for home and outdoor use.
No chemical pollution: will not produce harmful chemicals, more friendly to the environment and human body.
The following points should be noted when using an electric mosquito swatter:
Avoid using in humid environment, so as not to affect its high pressure effect.
Keep the electric mosquito bat dry to avoid short circuit or damage caused by moisture.
Avoid using in flammable and explosive environments to prevent accidents.
Children should use under adult supervision to prevent accidental handling or risk of electric shock.
In short, with its high efficiency, safety and environmental protection characteristics, the electric mosquito has become an ideal choice for summer pest control.
Electric Rechargeable Mosquito Killer,Mosquito Swatter Racket,Portable Mosquito Killer Lamp
Guangdong Dp Co., Ltd. , https://www.factorydp.com
