1903 One day, the famous French chemist Edward Benedict (1878- 1930) was cleaning the laboratory. When he dusted with a feather duster, he accidentally knocked a long-necked glass flask off a shelf more than 3 meters high. He thought that the glass flask must have been broken. He picked up the glass bottle and lost in thought. It turns out that this bottle used to contain nitrate cellulose. After the solution evaporates, a thin film is left on the bottle wall, which sticks tightly to the bottle wall like leather. He once put some water in the bottle. At this time, Benedict quickly wrote a label explaining this situation and put it on the bottle wall, and put it back in its original position.
1909 One day, Benedict read an accident news in the newspaper: on a foggy morning, a car crashed into a telephone pole, and the car fell into a ditch. One passenger died on the spot, and two other passengers were stabbed in the face and hands by windshield fragments ... At this time, Benedict remembered that he seemed to have seen unbreakable glass somewhere. So Benedict searched frantically, rummaged through the experimental records, looked at all kinds of experimental results and touched all the experimental instruments, and finally found the broken high-necked glass flask on the top of a row of experimental racks. He wants to apply the glass with plastic interlayer to the windshield of the car to reduce the casualties caused by the car accident. So, for the purpose of saving people, Benedict gave up some other research work and began to study and manufacture safety glass. Soon, he made a kind of celluloid laminated glass called Triplex. If this kind of glass is broken, its interlayer will contain a lot of glass fragments to avoid splashing and hurting people, thus greatly improving the safety of the car. 19 10 applied for the laminated glass patent, and191kloc-0/0/set up Valet Triplex Company in Paris to produce laminated glass.
At first, automobile manufacturers were not interested in Benedick's invention, mainly because the price was too expensive. The first to use this invention was the goggles on the gas mask produced during the First World War. Unfortunately, Benedick's laminated glass will turn yellow after a long time, so it is not widely used.
1905, John Wood, England also obtained the laminated glass patent.
The intermediate film material of laminated glass is nitrocellulose of American PPG Company 19 12 and cellulose acetate of 1928. 1938, the patent of American inventor Carleton Ellis (1876-1941) used synthetic resin, which did not change color with time and kept the glass clear. From 65438 to 0939, American LOF Company cooperated closely with DuPont Company and applied for the patent of PVB (polyvinyl butyral) to replace the old cellulose interlayer. The laminated windshield made of PVB film has the advantages of high strength, good light stability and no discoloration. It can also help prevent high-frequency sounds and harmful ultraviolet rays. This kind of laminated glass became popular in cars and later became a mandatory safety standard of the government. Laminated glass is also called "safety glass" or "glued glass".