Composite film with high light efficiency
DATE：2021/4/12 8:34:38 / READ： / SOURCE：This station
Composite film with high light efficiency
The application of plastic film in greenhouse is one of the most important symbols of the development of agricultural science and technology. So far, agricultural plastic film has been developed in an all-round way, but there are still many problems in the current agricultural film technology in China, among which the "functional" agricultural film has few products and narrow application. In Japan and other countries, functional agricultural film emerges in endlessly, which provides a solid foundation for the increase of agricultural production, the improvement of efficiency and the realization of the added value of agricultural film, and the application effect is very significant. Therefore, it is urgent to develop special, new and functional agricultural film. The so-called "high light efficiency film" is to add special chemical light conversion materials and thermal insulation materials in PE greenhouse film, so that the ultraviolet light in the sunlight can be converted into infrared or near-infrared light which is beneficial to the growth and development of plants, so as to promote the photosynthesis and metabolism of crops, improve the temperature in the greenhouse, increase the thermal insulation effect, and achieve the effect of increasing yield and early maturity of crops. Raw materials: ① low density polyethylene (LDPE): 1f7b, MFR: 7g / 10min, Beijing Yanshan Petrochemical Company; dimensional low density polyethylene (LLDPE): fg-20 type, MFR: 1g / 10min, density: 019g / EMR, Saudi Arabia; ③ antioxidant: gw-540, Taiyuan solvent factory; ④ light conversion agent: Institute of electronics, Chinese Academy of Sciences; ⑤ heat preservation agent: inorganic phosphate compounds and oxides. Composite coating production line www.handern.com
Equipment: ① granulation unit: single screw extruder SJ 65. Screw diameter 465m L / D08, double pressure exhaust, produced by shanjiamusi plastic machine factory; ② high speed mixer: s-600, produced by Guangdong Shantou plastic machine factory; ③ film blowing unit: S-3, produced by Shandong plastic machine factory (imitated from Japanese plaque company). Composite coating production line www.handern.com
Process conditions: ① granulation: screw speed 126r / min; temperature: 120 ° C in the first zone, 140 ° C in the third zone, 160 ° C in the third zone, 162 "C in the transition zone and 155C in the head. ② Film blowing: screw head, double tuyere air ring cooling, die diameter 350 mm, die gap 1.2 mm; die temperature: 1 zone 3 different and 2-e degree with light conversion agent. ④ It can be reported that 115C, 130c in the second zone, 150C in the third zone, 145c in the flange, 150C in the lower mould and 148C in the upper mould; the blowing ratio is 2.72, the screw speed is 65R / min, and the traction speed is 7m / min www.handern.com
Performance test: the total light transmission intensity and the maximum light transmission intensity of the wavelength using the American 212 spectrophotometer, light source: in vain, so can not be red lamp, wavelength range 380 ~ 780nm.
Formula features: due to the needs of practical application, the materials of shed film are required to have light weight, excellent light transmittance, high strength and aging resistance. The main materials for greenhouse film are EVA and LDPE. LDPE is characterized by small specific gravity, large covering area of the same weight of plastic film, low temperature resistance, good light transmittance, simple processing technology, and the folding width of plastic film can reach 8m. PVC has high strength, good heat preservation and small temperature difference between day and night, which is beneficial to crop growth. However, its processing technology is complex, and its low temperature resistance and aging resistance are not as good as LDPE.
Author：admin