Method for preserving resin
A preservation method and resin technology, applied to chemical instruments and methods, containers for preventing decay, flexible coverings, etc., can solve complicated and long-term problems
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Embodiment 1
[0054] A polycarbonate resin sheet (specific viscosity 0.375, Tg 176°C) obtained by interfacial polycondensation of 1,1-bis(4-hydroxyphenyl)cyclohexane was dried at 120°C for 6 hours to make the water content 330ppm. The dried flakes were put into an aluminum-clad laminated film bag produced by Keihan Selohan Co., Ltd. (a laminated bag with PP 30 μm, Sand PE 20 μm, aluminum 12 μm, Sand PE 20 μm, and PE 60 μm in order from the outer layer) and sealed. It was opened about one year later, and the moisture content was measured to be 330 ppm, and there was no moisture absorption during storage. 20 parts of the flakes were dissolved in 80 parts of dichloromethane and were completely clear without turbidity. Moreover, when the casting film is produced by the casting method, a transparent film with good surface and appearance can be obtained.
[0055] Further, a solution obtained by adding a hydrazine-type charge-transfer compound equivalent to the polycarbonate resin to the methylen...
Embodiment 2
[0057] A flake of copolycarbonate resin formed by bisphenol A and 9,9-bis(4-hydroxy-3-methylphenyl)fluorene in a molar ratio of 50:50 (specific viscosity 0.681, Tg 216°C), at 120°C It was dried for 6 hours so that the moisture content was 530 ppm. This dried sheet was put into the above-mentioned aluminum-clad laminated film bag manufactured by Keihan Cellohan Co., Ltd. and sealed. After opening about one month later, the moisture content was measured to be 540 ppm, and there was almost no moisture absorption during storage. Dissolve 20 parts of the flakes in 80 parts of dichloromethane, and then make a cast film by casting method to obtain a transparent film with good surface and appearance.
[0058] In addition, the polycarbonate solution was cast on a moving stainless steel plate through a T-die at 20°C, slowly raising the temperature while evaporating methylene chloride, peeling off the stainless steel plate, and further heating to remove methylene chloride to obtain a fi...
Embodiment 3
[0060] 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane and α,α'-bis(4-hydroxyphenyl)-m-diisopropylbenzene in molar ratio The 60:40 copolycarbonate pellets (specific viscosity 0.409, Tg 160°C) were dried at 120°C for 6 hours so that the moisture content was 210 ppm. Put the dry granules into an aluminum-clad laminated film bag produced by Osaka Park Co., Ltd. (a PE bag with a thickness of 70 μm is placed in a laminated bag with PP 20 μm, PE 20 μm, aluminum 12 μm, and PE 70 μm in order from the outer layer) and seal it. . It was opened about one month later, and the moisture content was measured to be 220 ppm, and there was almost no moisture absorption during storage. 20 parts of the granules were dissolved in 80 parts of dichloromethane, and a cast film was further produced by casting method to obtain a transparent film with good surface and appearance.
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