Preparation method and properties of tempered glass (senior two chemistry)

At present, the tempering of glass mainly includes physical tempering and chemical tempering. Ion exchange method for chemical tempering of nitrate. Glass is similar, with poor safety, unstable performance, easy fading of physical properties such as mechanical strength and impact strength, and rapid strength decay with time. The advantages of air cooling tempering are low cost, high output, high mechanical strength and thermal shock resistance. Moreover, air-cooled tempered glass can not only enhance the mechanical strength, but also form small fragments when broken, which can reduce the harm to human body. However, there are certain requirements for the thickness and shape of glass, which leads to slow cooling speed and high energy consumption. For thin glass, there is still the problem of glass deformation in the tempering process, so it can not be applied to fields with high optical quality requirements. At present, air tempered glass is mostly used in automobiles, ships and buildings. Compared with the traditional wind tempering process, the new particle tempering process. The cooling medium has large cooling energy and is suitable for tempered ultra-thin glass. However, the cooling medium cost of particle tempering process is high. Suitable for thin glass and ultra-thin glass with high strength and precision. Fog tempering method has the advantages of easily available cooling medium, low cost, no environmental pollution, etc. It can also temper thin glass that cannot be tempered by ordinary gas, liquid and particles. However, the cooling uniformity is difficult to control and is rarely used at present. Therefore, we provide a simple method for preparing tempered glass without adding any additives. Firstly, clean that glass products to be toughen without defects after cutting and grin, and putting the cleaned glass products into a frame made of stainless steel; Then put the glasses frame with glass products into a muffle furnace, raise the temperature from room temperature to 550%-700℃ at a speed of 3 ci = ~ 20℃ for 30-120 minutes, then quickly soak the glasses frame with glass products in 100% 250% methyl silicone oil and let it stand for 5-/kloc-. Finally, the glass products and the frame are taken out, put into a 200% oven for 30 minutes, and naturally cooled to room temperature with the oven; After the glass product is taken out, it is washed with carbon tetrachloride first, then with clear water, and then dried to obtain tempered glass. In order to make the temperature of methyl silicone oil uniform, the methyl silicone oil was heated in an oven and stirred with a magnetic stirrer. The cooling liquid is methyl silicone oil, and no additives are added, so the preparation process is simple. The tempered glass produced by the invention has the advantages of high strength, low cost, high yield and the like. And has simple equipment and less investment. This method can be used not only for tempering flat glass, but also for tempering special-shaped products. Tempered glass manufactured by this method has uniform stress distribution, high impact strength and good tempering effect. Contact: Guo Hongwei Address: Shaanxi University of Science and Technology, weiyang district University Park, xi, Zip code: 7 1002 1 Car paint cleaning and repairing agent can remove stains, rust, yellowing and discoloration on the car surface, repair superficial scratches on the paint surface, and the cleaned and repaired paint surface can increase luster. The automobile paint cleaning and repairing agent mainly consists of the following components in percentage by weight: diatomite 3038, mineral oil 68, sodium sulfosuccinate octaester 15-20, Tween 80 and water 30-38. Crushing diatomaceous earth in the automobile paint cleaning and repairing agent, sieving with a 300-400 mesh sieve, sequentially putting powdered diatomaceous earth, water, mineral oil, sodium succinate and Tween 80 into a stirring and dispersing machine, heating to 70%-80 DEG C, adding materials while stirring, and standing after stirring 1- 1.5/b, and secondly, Diatomite, as an abrasive, has the functions of decolorization and whitening, and can quickly remove stubborn dirt and stains. As a water-soluble penetrant, sodium succinate monoester octoate can quickly penetrate and wet stains, rust spots and asphalt spots. Tween 80, as a nonionic surfactant, can enhance the emulsification and mixing degree of water and oil, reduce the stratification phenomenon of water and oil, and also has Bai Jie effect. Mineral oil has the functions of brightening and assisting decontamination. This preparation is an environmentally-friendly water-soluble product with a pH of 7 and a neutral pH value, which does no harm to opponents. Its appearance is light beige. The patent number of liquid 7D2 automobile paint cleaning and repairing agent is 2008 10070 107.8. If you need other colors, you can add pigments. The cleaning and repairing agent has the following characteristics: 1, which has a strong function of removing stubborn dirt, including oxide layer, asphalt black spots, sewage stains, rust water stains, automobile engine surface stains, automobile seat leather surface stains, etc. , and does not damage the surface of the object, especially for the yellow white car paint, renovation and whitening are more obvious. 2. It has the effect of repairing superficial scratches on automobile paint surface and scratches on door handles. 3. The glass covered by oil fume can be cleaned quickly, and the cleaned glass also has anti-fog effect. 4, the object will increase luster after cleaning.