Development and application prospect of automotive

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Development and application prospects of heat reflective automotive laminated glass

current situation of heat reflective insulating automotive glass according to the Traffic Management Bureau of the Ministry of public security, by the end of March 2007, the number of cars in China had reached 51.81 million, including 30.95 million private cars. According to experts' prediction, China's car ownership will increase at a rate of 16% - 20% from 2006 to 2010. By 2010, China's car ownership will be between 66.5 million and 84.31 million. According to the "research and implementation report on China's diesel technology and diesel vehicle development policy" prepared by the development research center of the State Council, China's car ownership will reach 150million in 2020. Cars have become an indispensable part of people's life

at present, the area of automotive glass is becoming larger and larger, so the heat transferred to the vehicle through automotive glass is also increasing correspondingly. In hot summer, the strong sunlight makes the temperature inside the parked car rise sharply. When people come to the car again, it is often very hot and difficult to stop. Generally speaking, the heat reflective front windshield can effectively reduce the transmittance of solar energy, reduce the energy consumption of air conditioning, and provide a comfortable driving space whether parking or driving

at present, there are three main ways to realize the thermal reflection and heat insulation of automotive glass:

one is to adopt the method of insulating intermediate film, such as xir film. The infrared thermal reflection functional film is first plated on PET sheet, and then laminated with PVB. The disadvantage is that the cost is high, it is unlikely to process products with large area and deep bending, and the xir film is easy to fold

the second is that the car beauty shop adopts the way of car film. On the market, coated glass not only plays the role of heat insulation and privacy protection, but also greatly reduces the visible light transmittance of windshield glass, which has many potential safety hazards. If the light in the car is too dark, it is easy to make the driver sleepy, and it is not convenient to observe the surrounding conditions of the vehicle, especially the traffic conditions of pedestrians and non motor vehicles; When the vehicle drives at night or turns sharply, it is difficult to see the road ahead through the glass; As the film only leaves a position beside the front door glass where the inverted rear mirror can be observed, it is not convenient to observe vehicles entering the dead corner of the inverted rear mirror. Moreover, the durability of the film is not good, and it is easy to blister, degumm and change color under the sunlight, leaving potential safety hazards

the third way is glass coating. Glass is formed by hot bending first, and then by coating, interlayer and gluing. The disadvantage is that the firmness of the film is not high, it is easy to oxidize and deteriorate in the future, and the life cycle is limited

production process control of heat reflective automotive laminated glass heat reflective automotive laminated glass is a new type of high-tech automotive glass. Strict production process control and good quality management system must be adopted to ensure the quality of products. Its control is mainly achieved through the following key links

treatment of glass original sheet the original sheet for coating uses fresh float glass produced within seven days. The surface activity of the glass is very good, which can ensure that the film has good adhesion with the glass, and the obtained film is firm and has good oxidation resistance

solution to the problem of appearance defects because the film is a soft film plated offline, the film needs special care in the later processing to prevent scratches, oxidation and other defects. Wear masks, gloves and other supplies strictly during production and replace them regularly to ensure cleanliness. Due to the antireflection coating, the interference condition at this point will be destroyed when the isolating powder remains on it, but the existence of powder particles will be highlighted, resulting in point defects. In the process of powder spraying and sheet preparation before hot bending, in order to avoid the two pieces of glass sticking together during hot bending, special ultra-fine isolation powder is used, mixed with deionized water, and sprayed with a spray gun with high atomization effect. After drying, a very uniform layer of isolation powder is formed on the surface of the glass

glass softens slowly from solid state to liquid state with the increase of temperature. Using this property, the glass can be heated to the temperature set by an aluminum alloy window support qb/t 3887 ⑴ 999 to make the shape we need. In the hot bending process, specific molds and hot bending promotion measures are adopted to strengthen convective heat transfer and avoid film falling off and glass mold falling of Low-E coated glass due to uneven heating

good quality assurance system heat reflective automotive laminated glass is a new favorite of automotive glass in China. At present, the state has not issued relevant standards. The manufacturing enterprise has formulated a new enterprise standard on the basis of its original solar-e-xinyi product enterprise standard. In terms of safety performance, it fully meets the requirements of the latest GB9656-2003 national standard for automotive glass, and the heat insulation and sunshade performance is in accordance with the national standard gb/t5137 The solar transmittance measurement method of automotive safety glass is equivalent to the technical index of Southwall technology company in Silicon Valley Science Park of the United States

advantages and application prospects of heat reflective automotive laminated glass. Heat reflective automotive laminated glass is a new green and environmental friendly high-tech product, which is made of high-performance coated glass and ordinary glass by PVB bonding. The product fully meets the conventional safety performance indicators, with good penetration resistance, impact resistance, optical performance, small secondary image deviation and light distortion. The visible light transmittance of this product is greater than 70%, which overcomes the shortcomings of low visible light transmittance of automotive glass film and affects safety. It can provide comfortable and clear vision for passengers and drivers, and greatly improve the safety factor of driving. It has good sunshade effect, reflects the infrared ray in the solar spectrum, reduces the heat energy in the sunlight transmitted to the car through the glass, can block more than 66% of the heat radiation in the sunlight, greatly reduces the load of the air conditioner, and achieves the purpose of saving oil, reducing consumption and reducing emission indicators; It can block more than 99.9% of the ultraviolet rays in the sunlight, effectively protect the car interior, and the anti range is generally 4% ⑴ 00% F.S. it can stop aging and discoloration, reduce the burning sensation of the driver's skin, and increase comfort. In addition, the processing shape and area of the glass are not limited, which can meet the needs of all automotive glass in the market, and the film is subject to the following causes of failure in the laminated layer: to permanent protection, it will not be easily oxidized, and has good durability and wear resistance, overcoming the shortcomings of the automotive glass film that is not durable and wear-resistant

at present, the direct solar transmittance of heat reflective automotive laminated glass in the wavelength range of 280 ~ 2500nm is only 34%, and the reflectivity is as high as 43%, which means that 66% of solar energy is blocked; Transparent laminated glass itself can only block 16% of solar energy, so the difference between the two is that it blocks 50% more solar energy. If the power consumption of each vehicle for refrigeration is more than 1 liter per hundred kilometers, the fuel consumption can be reduced by at least 0.5 liter per hundred kilometers after using this product. Taking a vehicle with an annual driving distance of 30000km as an example, 150 liters of fuel can be saved per vehicle per year. At the end of March, 2007, the number of cars owned has reached at least 51.8 million. If only 30% of them use this product, 2.33 billion liters of fuel will be saved every year. At present, the price of No. 93 gasoline, which is the most used, is about 4.8rmb/liter in the Guangdong market. The amount saved in one year is 11.2 billion yuan, and the saving effect is very observable

in a word, heat reflective automotive laminated glass is a green environmental protection product with excellent characteristics such as safety, clarity, UV isolation, heat insulation, scratch prevention, etc., which adapts to the trend of the times and the national policy. Today, with the increasing prevalence of energy conservation and consumption reduction, it undoubtedly contributes to the environmental protection of energy-saving tensile testing machine, which is an extremely widely used testing machine. It is believed that the product will be popular with OEM OEMs Automobile repair shops and the majority of end customers

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