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[China Glass Network] When we are driving out, the clear vision is an important project to ensure the safety of our driving. However, when it is raining or when the temperature is low, when the water vapor with a certain partial pressure is cooled to its dew point, the water vapor is saturated, and the small water droplets are condensed and precipitated. The small water droplets adhere to the surface of the glass and fogging occurs. The so-called "fogging" is to form a large number of fine water droplets on the surface of the glass. Due to the different radius of curvature of the small water droplets, the diffuse reflection on the light is different. This fogging phenomenon seriously affects the safety of driving.
At present, there are three main researches on automotive glass anti-fog technology: 1) anti-fog treatment on the glass surface; 2) installation of anti-fog glass; 3) anti-fog in air conditioning system. This article mainly introduces the anti-fog treatment of the glass surface.
Anti-fog treatment on the glass surface is the most researched and anti-fog technology for automotive glass. It has the advantages of simple operation, low cost and easy promotion. According to the main anti-fog raw materials, it is divided into surfactant spraying method, polymer film coating method and inorganic molecular coating method. Due to their respective advantages and disadvantages, some studies have shown that a combination of three anti-fog material coatings can achieve a more excellent anti-fog effect.
In the 1950s, people began to spray soapy water on the surface of glass lenses for anti-fog. It can be seen that the use of surfactant anti-fog has been around for a long time.
Surfactant is a kind of substance which can quickly reduce the surface tension of water. Its anti-fog property is mainly through wetting, reducing the contact angle, so that the water droplets are spread on the surface of the glass to form a water film to achieve anti-fog. Effect.
Surfactants generally having a certain anti-fog property have an HLB value of 10 to 16, especially 11 to 14, including alkylbenzenesulfonates, alkanolamides, fatty acid glycerides, fatty alcohol ether sulfates, alanines. , alkylphenol ethoxylates, alkyl polyoxyethylene ethers, polyoxyethylene glycol fatty acid esters, block copolymers of ethylene oxide and propylene oxide, polyoxyethylene fatty acid sucrose esters, polyoxyethylene Sorbitol fatty acid ester and the like.
The surfactant antifogging agent usually consists of a surfactant, a solvent, a dispersant, and the like. In addition, a small amount of flavor, propellant, or antistatic agent can be added to enrich its efficacy. The advantages are: low raw materials, simple production process, good anti-fog effect and convenient use. Therefore, there is still a place in today's anti-fog variety.
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