Author: Liu Anning China's rare earth material reserves account for more than 80% of the world. China's chief designer Deng Xiaoping once said: "There is oil in the Middle East and China has rare earth." Rare earth mines are China's strategic resources. Therefore, nano rare earth materials are the future development direction of our business. The photoluminescent safety sign is a high-tech project with low investment, quick results and high added value. So far, many people have not known and understood this product. Its domestic development space is huge, the market is broad, and its social and economic benefits are inestimable. 1. Rare earth use China's rare earth resources account for more than 80% of the world's reserves, making it the most abundant country. Not only does the reserves rank first in the world, but it has also become the largest production, export and application country with a dominant world rare earth market. In order to effectively use and develop China's rare earth resources, China University of Geosciences successfully developed ultra-bright, ultra-long afterglow nano rare earth luminescent powder as early as a few years ago, filling the domestic gap. The product has extremely strong light absorption, light storage, and luminescence functions, and can produce self-luminous signs for fire safety channels, luminous motorcycle safety helmets, luminous billboards, highway luminous road signs, luminous license plates, luminous paintings and other products. It can also be widely used in various fields such as public security, fire protection, electric power, transportation, construction, decoration, railway, ship, aviation, post and telecommunications, communications, airports, mines, hospitals, tourism, civil air defense engineering, arts and crafts, military facilities, electronic appliances, etc. It is a high-tech project with low investment, quick results and high added value. This product not only has a large domestic market demand, but also has a brighter prospect in the international market (exports can be earned through export). This product has obvious features such as energy saving, environmental protection, safety and wide application range. 1. Short light absorption time, long luminescence time, high brightness: This luminescent material is absolutely different from reflective materials or luminescent materials. It can be irradiated by natural light, sunlight, and lights for about 10 to 30 minutes. It can continuously emit light at night or in a dark place and release various High brightness afterglow of various colors, afterglow time up to 10h. 2. Good physical and chemical stability, long service life: the material can withstand long-term exposure to sunlight, it will not blacken or deteriorate under harsh environments such as high temperature (500 ℃) and low temperature (-60 ℃) or strong ultraviolet radiation, and it can maintain good It has a luminous state and a service life of more than 10 years. 3. Safe, reliable, energy-saving and environmentally friendly: The material does not contain any radioactive materials after testing, is non-toxic and harmless, and has no three waste pollution during production and use. It can absorb light and emit light without the use of power or other artificial energy. Energy-saving products. 4. Complete color variety: existing yellow, yellow-green, blue, blue-green, purple, red and other luminous colors. 5. Widely used: luminous paints, fluorescent ink, luminous printing paste, luminous plastic, luminous rubber, luminous leather products, luminous ceramics, luminous enamel, luminous fiber, luminous glass, luminous film, luminous calligraphy, luminous resin products, Luminous jade and other products. 2. Market demand With the development of the economy, people's lives are moving towards a well-off society, there are more and more high-rise buildings, the state pays more and more attention to fire safety, and the functions of the government's fire department are constantly strengthened. "How to reduce casualties" is listed as fire fighting One of the key points. When a fire accident occurs, the power is usually cut off, the building is in a dark state, and the evacuation of people is about life. The evacuation of people is a matter of life and death. Therefore, the identification signs of fire evacuation in the dark are listed as mandatory products for fire protection. The "September 11 incident in the United States" that shocked the world is because of the use of such products, allowing many people to escape and greatly reducing casualties. The application fields of fire signs are very wide, such as buildings, hotels, stadiums, airports, underground passages, hospitals and other places need this kind of fire signs. At present, the application of luminous signs has great room for development in China. Many people still have I don't know and understand this product, so this article will introduce this product in detail. 3. Product Design The luminescence principle of rare earth luminescent materials: Use visible light to activate the Eu3 +, Dy3 + and other elements in the rare earth luminescent materials, and the stored light can emit yellow-green light with a wavelength of 450 ~ 600nm in the dark. We use this principle of luminescence to produce photoluminescent safety signs from rare earth luminescent materials by screen printing, and use PVC rigid low-foaming polyvinyl chloride sheets or flame-retardant ABS according to the different requirements of the place of use, environment and customers. The materials are used to make fire signs. Working principle: It can reach saturation in the daytime or under light absorption for 10 ~ 30min, and can continue to emit light for more than 10h when it is in a dark place. The working process is: light absorption, light emission, light absorption, light emission, which can be cycled countless times. The rare-earth luminescent powder is light yellow, so it is better to choose blue or green to make the label PVC sheet. The graphics and geometric dimensions of photoluminescent safety signs have national standards. 4. Preparation of luminous ink Cyclohexone ketone (industrial use) 50% Polyvinyl chloride resin (powder or granule) 20% Rare earth luminescent powder (ultra high brightness) 33% Product Specifications of Rare Earth Luminescent Powder (see Table 1) Table 1 Specifications of rare earth luminescent powder To produce high-quality photoluminescence safety sign products, in the attitude of being responsible for the safety of the people, we must choose the best quality ultra-high brightness rare earth luminous powder. Do not use low-brightness luminous powder and smash your own brand. 5. Plate-making materials Diazo photosensitive adhesive (solvent-resistant type) Polyester screen (120 ~ 200 mesh) 6. Printing process 1. The PVC sheet is cut with a paper cutter, which not only saves time, but also has neat corners, no burrs, and no scratches on the board surface. 2. Before screen-printing luminous ink, a white pigment ink must be printed as a primer, and then screen-printed to cover the luminous ink. Because white has a reflective effect, the luminous brightness is 100. 3. In printing, it is found that the plastic ink is easy to be dried and affects the printing quality. Slow-drying agent should be added for blending. 4. Whether printing white plastic ink or luminous ink, scrape from the distance to the arms, and push back from the arms to the distance when returning the ink. The direction of the scraping should be the same and the ink covered should be uniform. 5. The amount of ink scraped on the PVC board depends on the dynamic pressure of the scraper. The hardness of the scraper is 70 ~ 75 °, the corners should be vertical and flat, and the length of the scraper should be 2 ~ 3cm larger than the two sides of the screen. Scrape angle, pressure and speed should be mastered by yourself, and necessary adjustments should be made in time. 6. When installing the aluminum alloy frame or plastic frame on the printed product, the edges and corners of the frame should be polished to avoid roughness and cutting. At the same time, the corners of the frame should be clamped and cannot be loosened. After the installation is complete, the bag must be packed immediately to avoid damage to the surface of the sign, and finally the qualified products are boxed and stored. GlazeKing Ceramics TechnologyCo.,Ltd. , https://www.maglazekingceramics.com