Chemical modification of polycarbonate high speed coating composite production line
DATE：2021/6/7 8:39:56 / READ： / SOURCE：This station
Chemical modification of polycarbonate high speed coating composite production line
With the development of machinery, automobile, electronics, electrical appliances, construction and other industries, especially in recent years, with the rapid growth of the demand for PC by optical fiber communication, various kinds of computer discs, household VCDs and CDs, new performance requirements are put forward for PC. Therefore, many scholars have devoted themselves to the chemical modification of PC and made remarkable progress. High speed coating compound production line www.handern.comImprovement of optical properties（ 1) High transparency PC transparency is one of the most important characteristics of PC. when 238 SNM "fraction is 2.0%, the refractive index is 1.579, which can effectively enhance the transparency of PC. It is a direction of chemical modification of PC to seek new functions and applications. The transmittance of ordinary PC is generally 5% ~ 0%. In order to change the transparency of the tube, the third monomer was added, the product structure of P was changed, and the third monomer of Part 14 was added into the polymerization system. Through the Luo liquid phosgene method, the two monomers could polymerize with double A. after the post-treatment, the light transmittance of the product was more than 92%, It can enhance the transparency of PC products. The third monomer can be not only a small molecule compound, but also a polymer. They can react directly with monomers such as bisphenol A, phosgene (or aminidase compounds), and can also react with prepolymer C formed in the initial stage of the reaction to form long copolymers. In the presence of pyrogenic acid, octamethylcyclotetra fused oxygen (omts) was used for ring opening and self fruiting of vegetables, and 2-silylbenzaldehyde was added to form quotient molecules with meridional groups at the end of the net, which were then copolymerized with PC prepolymer (polymerization degree 3 ~ 4) by phosgene method. The PC / PDMS section was obtained. When PDMS quality. High speed coating compound production line www.handern.com
(2) Radiation resistant transparent PC, as a PC material for medical devices (can be used as a container for artificial dialysis valve and artificial heart lung), needs to be transparent. And keep the heat resistance of steam during disinfection. lately. Y-ray sterilization has been widely used because of its simple process and low cost. Therefore, PC is required to be able to resist y-ray radiation. Therefore, a PC material without yellowing, strength and transparency degradation under radiation is developed. High speed coating compound production line www.handern.com
(3) Anti static, high mobility transparent PC as a substitute for glass material, PC has excellent impact resistance, light weight, shape freedom, easy production, and can be used as the headlamp lens (H / L) of automobile. With the high functionality of H / L, especially the use of halogen headlamp, new requirements are put forward for PC. As the dust is easily attached to the mirror cover, an antistatic PC is needed; At the same time, due to the thinning of H / L thickness, PC is required to have high fluidity. In addition, instead of glass, automotive window glass requires PC with high rigidity, low linear expansion and scratch resistance. In the field of stationery and other groceries, it is also required to keep PC high transparency, drug resistance and anti-static. High speed coating compound production line www.handern.com
(4) Birefringence reduction PC, like other transparent polymers, produces anisotropy due to the forced orientation of molecules in uniaxial tension, and generates high-energy internal stress. Extrusion, pressing and cooling in the process of melt bonding will become the most important selection of molecular segments. As a result, the refractive index of the material is different in different directions, which has a great influence on the birefringence of PC optical products. In recent years, there are many researches on reducing the birefringence of PC optical products by copolymerization. The main way is to reduce the birefringence of PC optical products by copolymerization, increasing the flexibility of the molecular chain or reducing the intermolecular interaction. 2.2.4.4-tetramethyl-1.3-cyclobutanediol was used as the third monomer. It was mixed with diphenyl carbonate and bisphenol A at the mass ratio of 0.51140.5, and copolymerized under the action of catalyst LiH. The cyclobutanol structure in the monomer enhanced the rotation of the molecular chain and reduced the rigidity of the chain, so as to reduce the birefringence. Using 2.9-bis (4-hydroxyphenyl) n-decane as the third monomer and alkyl group with more chain repeat units as the central group, the oriented molecular chain caused in the process of processing can be recovered to a great extent after the external stress is eliminated, and the birefringence of PC can be reduced. The long-chain alkane 1.2-ethylidene structure of 2,9-bis (4-hydroxyphenyl) n-decane makes it polymerize with bisphenol A by phosgene method. The birefringence of the polymer product after post-treatment is obviously reduced, which is suitable for making optical products. In addition, using 1.1-bis (4-hydroxyphenyl) - 3,3.5-trimethylcyclohexane as comonomer, the carbon atom in the center of the monomer has a larger side group, which makes the chain spacing increase, thus reducing the intermolecular interaction, reducing the internal stress stored in the processing process, and also reducing the birefringence. The monomer PC and bisphenol A were polymerized with phosgene under the action of capped tert butylphenol and catalyst three ethylamine, then the copolymer powder was mixed with beeswax. Finally, after granulation and extrusion, the product had lower birefringence and was suitable for making optical recording materials. High speed coating compound production line www.handern.com
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