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Preparation method of star-type transparent polyamide
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A polyamide and transparent technology, which is applied in the field of star-shaped transparent polyamide production method, can solve the problems of undisclosed star-shaped transparent polyamide production method, etc., and achieve the effect of good transparency
Active Publication Date: 2015-07-01
SHANDONG GUANGYIN NEW MATERIALS
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But these patents all do not disclose the preparation method of star-shaped transparent polyamide
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Embodiment 1
[0019] Put 2kg of dodecanedibasic acid, 1.83kg of PACM, 3.8g of phosphorous acid, 3kg of water and 17.8g of C22-tricarboxylic acid into a 12L polymerization kettle, using CO 2 The air was replaced twice, and the polymerization kettle was heated. After 10 minutes, start stirring, control the temperature in the kettle below 160°C, wait until there is no abnormal sound in the stirring, make the temperature in the kettle reach 230°C, the pressure reach 13-15MPa, and keep the temperature for 2 hours.
[0020] Slowly release the pressure, about 10min / MPa, keep the temperature of the reactor above 230°C, and keep the pressure at normal pressure for 2 hours after the pressure release is completed. Then heat the discharge port, and after a period of time, fill the kettle with CO 2 , so that the pressure in the kettle reaches about 0.5MPa, and then open the valve of the discharge port to discharge, cool and pelletize, and dry to obtain transparent polyamide. Compared with PACM12 with ...
Embodiment 2
[0022] Put 2kg of dodecanedibasic acid, 1.83kg of PACM, 3.8g of phosphorous acid, 3kg of water and 7.3g of 1,3,5-benzenetricarboxylic acid into a 12L polymerization kettle, using CO 2 The air was replaced twice, and the polymerization kettle was heated. After 10 minutes, start stirring, control the temperature in the kettle below 160°C, wait until there is no abnormal sound in the stirring, make the temperature in the kettle reach 230°C, the pressure reach 13-15MPa, and keep the temperature for 2 hours.
[0023] Slowly release the pressure, about 10min / MPa, keep the temperature of the reactor above 230°C, and keep the pressure at normal pressure for 2 hours after the pressure release is completed. Then heat the discharge port, and after a period of time, fill the kettle with CO 2 , so that the pressure in the kettle reaches about 0.5MPa, and then open the valve of the discharge port to discharge, cool and pelletize, and dry to obtain transparent polyamide. Compared with PACM...
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Abstract
The invention relates to the technical field of polyamide, and particularly relates to a preparation method of star-type transparent polyamide. The method comprises a step that a target product is prepared by adding polybasic carboxylic acid when polyamide is produced by polymerizing diamine and diacid. The method is characterized in that at least one component of diamine and diacid is a cycloaliphatic and / or aromatic component; the polybasic carboxylic acid component is aromatic and / or cycloaliphatic; the total quantity of polybasic carboxylic acid is 0.01-10 mol% of the raw material quantity of polyamide. The product is high in transparency, relatively high in processing performance, relatively low in processing temperature and high in rheological property.
Description
technical field [0001] The invention relates to a method for preparing polyamide, in particular to a method for preparing star-shaped transparent polyamide. Background technique [0002] Transparent polyamide is generally an amorphous polymer or a semi-crystalline polymer, because it has good impacttoughness, relatively high mechanical strength, excellent heat resistance, wear resistance, oil resistance, chemical corrosion resistance, and small linear expansion coefficient , low molding shrinkage, good dimensional stability, etc., can be widely used in precision optical instruments, measuring instruments, pharmaceutical and chemical packaging materials, eye frames, high-end sports equipment and auto parts and other fields. [0003] Patents on transparent polyamides are also common. For example, DE4310970A1 describes PACM10 and PACM12 molding compositions; DE10009756A1 describes amorphous polyamides in combination with MACM, IPS and lactam-12; CN102015899A describes transpar...
Claims
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Application Information
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