New flame retardant system of polycarbonate BOPET biaxially oriented film production line
DATE：2021/6/11 8:37:00 / READ： / SOURCE：This station
New flame retardant system of polycarbonate BOPET biaxially oriented film production line
Organosilicon oligomer can be used as a new flame retardant system for PC. Shinyue company of Japan has recently developed three organosilicon oligomers x-40-9243, x-40-9244 and organic tree x-40-9805 for flame retardancy of PC. The first two are methylphenyl liquid organosilicon products, while the latter are methylphenyl solid organic products. Their basic characteristics are as follows: x-10-9243 is colorless and transparent liquid, kinematic viscosity (25 ℃) 50mm /, relative density (25 ℃) 1.11, refractive index (25C) 1.01, active ingredient 100%; X-40-9244 is a colorless and transparent liquid with kinematic viscosity (25 ℃) 500mm / s, relative density (25 ℃) 1.09, refractive index (25 ℃) 1.538, and active ingredient 100%; X-40-9805 is white powder, volatile components (105 ℃ / 3H) < 0.1%, softening point 95 ℃, active components 100%. They are mainly used for flame retardant of PC. The halogen-free flame retardant PC material with good environmental friendliness and safety can be obtained by adding the above silicone products into PC resin and mixing them evenly. They have excellent compatibility with PC resin, and will not damage the formability, impact strength and moisture resistance of PC. The properties of PC with proper amount of x-40-9805 are as follows (the numbers in brackets are the corresponding values of pure PC): melt flow rate 11.8 (5.4) g / 10min, flexural strength 93.0 (96.0) MPa, flexural modulus 2.2 (2.3) GPA, impact strength 800 (970) J / m, hot deformation temperature 134 (138) ℃, Rockwell hardness 60 (63), flame retardancy UL94V-0 (V-2) and oxygen index 38 (28). BOPET biaxially oriented film production line www.handern.comThe flame retardancy of PC alloy was studied by cone calorimeter. The results show that PC alloy with inorganic particles in heat release rate, mass loss rate and smoke generation rate is a high flame retardant, environment-friendly and practical flame retardant system. PC/ modified nano particles containing nano CaCO, nano SiO:, montmorillonite (MMT) modifier mixed with PC, through cone calorimeter significantly reduced, burning time increased, indicating that nanoparticles containing PC modifier PC flame retardant, emulsion polymerization of CaCO containing; Compared with pure PC, it contains modified nano CaCO; The results show that the heat release rate and heat release rate of PC alloy are reduced, and the combustion time is increased, which is beneficial to reduce the fire hazards and strive for a longer fire extinguishing time. Compared with PC, the exothermic rate of PC / modified nano SiO is similar to that of PC / modified nano CaCO, the exothermic rate and exothermic rate are decreased, and the combustion time is increased, but the exothermic rate is more gentle and the combustion time is longer, which is very beneficial to Skyfire. Compared with PC, the heat release rate of PC / modified nano MMT is more uniform, the heat release rate is gentle, the combustion time is longer, and more time can be obtained for fire extinguishing. Compared with the three kinds of nano modifiers, the exothermic rate of PC alloy containing modified nano SiO: and modified nano MMT is slower, and the exothermic rate of PC alloy containing modified nano CaCO is faster. This is because modified nano SiO: and modified MMT have smaller particle diameter, while CaCO has larger particle diameter. In the process of combustion, it is easier to form a dense protective layer on the polymer surface, which leads to longer combustion time and lower heat release rate. In addition, after adding nano modifier, the residual material increased greatly. This is due to the existence of inorganic particles, which play a role of physical barrier, prevent the decomposition of polymer, and increase the residual mass. BOPET biaxially oriented film production line www.handern.com
According to the analysis, there is basically no residue after PC combustion, while there is a large amount of residue after FC building containing modified nano MMT and other inorganic soft particles is burned. The formed slag can have two functions: 0 mass energy transmission screen, which extends the volatilization and diffusion of the sub industry, thus reducing the mass loss rate of the material: @ heat insulation function, which prevents the unburned part from directly protecting the flame, It slows down the heat transfer of the unburned part of the combustion, so it plays a role of flame retardant, which is the main mechanism of improving the quality of PC. In addition, the mechanism of smoke suppression may be related to the protective effect of carbon slag layer. Therefore, some nano modifiers also have effective flame retardant effect on PC. BOPET biaxially oriented film production line www.handern.com
The synergistic effect of flame retardants is attracting more and more attention. PC was modified by ppsq, SNN and PVDF. The composite of ppsq, SNN and PVDF reached UL94V-0 (1.6mm), and the synergistic effect was very significant. TG analysis showed that the synergistic effect of flame retardants increased the initial thermal degradation temperature and thermal degradation rate of PC, changed the thermal degradation pathway of PC, and made the degradation products cross-linked to form a hard carbon layer to play a flame retardant role. BOPET biaxially oriented film production line www.handern.com
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