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Preparation method of polycarbonate powder

A technology of polycarbonate and a manufacturing method, which is applied in the field of manufacturing polycarbonate powder from polycarbonate solution, can solve the problems of affecting product quality, uneven polycarbonate powder, difficulty in recovering residual solvent, etc., and achieves the recovery rate High performance, mild operating conditions, simple equipment

Inactive Publication Date: 2013-01-02
JIANGSU YANGNONG CHEM GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application CN101503520A discloses a method for polycarbonate solution aqueous phase precipitation and desolventization, including anti-solvent added to the aqueous phase system, anti-solvent refers to methyl isobutyl ketone, methyl ethyl ketone, heptyl alkane and other organic solvents; a shortcoming of this method is that due to the use of organic solvents such as methyl isobutyl ketone, methyl ethyl ketone, and heptane in the process, the obtained polycarbonate material is wrapped in organic solvents, which affects the product quality, while the organic solvent needs to be recovered; another disadvantage is that the produced polycarbonate powder is not uniform
Chinese invention patent CN1733819A discloses a method for obtaining polycarbonate powder by pulverizing the powder under airflow after first removing part of the solvent of the polycarbonate solution by evaporation; In the partial solvent process, 40% to 50% of the remaining material relative to the dry powder solvent is a colloidal material. The evaporation temperature reaches 100°C, and the viscosity of the colloidal material is still relatively high. Special equipment is required to achieve the purpose of evaporating the solvent. ;Another disadvantage is that the powder is pulverized under the airflow, and it is difficult to recover the residual solvent

Method used

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  • Preparation method of polycarbonate powder

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) In a 100L stirred tank, first add 60kg of deionized water, the stirring speed is 500 rpm, and then add 1.2kg of polycarbonate powder with an average particle size of 1.5mm and a number average molecular weight of 21000; (2) After the temperature rises to 53°C, 58kg of polycarbonate solution with a mass fraction of 14.5% and a number average molecular weight of 21,000 is added dropwise for 1 hour, and methylene chloride is recovered at the same time; (3) After the addition, the temperature of the material Raise it to 85°C for 2 hours, and recover dichloromethane at the same time; (4) The slurry is first pulverized with a pulverizing pump with a gap of 4mm between the rotary mill and the fixed mill, and then centrifugally separated at a speed of 1500 rpm Machine for solid-liquid separation to obtain polycarbonate wet powder and mother liquor, and the mother liquor is used to manufacture the next batch of polycarbonate powder; (5) Dry polycarbonate wet powder at 125°C f...

Embodiment 2

[0035] (1) In a 100L stirred tank, first add 60kg of deionized water, the stirring speed is 500 rpm, and then add 0.9kg of polycarbonate powder with an average particle size of 1.5mm and a number average molecular weight of 27000; (2) After the temperature rises to 55°C, 50kg of polycarbonate solution with a mass fraction of 14.5% and a number average molecular weight of 27,000 is added dropwise for 1 hour, and methylene chloride is recovered at the same time; (3) After the addition, the temperature of the material Raise it to 90°C, desolventize for 2 hours, and recover dichloromethane at the same time; (4) The slurry is first pulverized with a pulverizing pump with a gap of 4mm between the rotary mill and the fixed mill, and then centrifuged with a speed of 1500 rpm The separator performs solid-liquid separation to obtain polycarbonate wet powder and mother liquor, and the mother liquor is used to manufacture the next batch of polycarbonate powder; (5) The polycarbonate wet po...

Embodiment 3

[0038](1) In a 100L stirred tank, first add 60kg of the mother liquor in Example 2, the stirring speed is 600 rpm, and then add 0.9kg of polycarbonate powder with an average particle size of 1.5mm and a number average molecular weight of 27000; (2 ) After the temperature of the material rises to 53°C, add 82.5kg of polycarbonate solution with a mass fraction of 14.5% and a number average molecular weight of 27,000 dropwise for 1.5 hours, while recovering dichloromethane; (3) after the dropwise addition , the temperature of the material was raised to 85°C, the precipitation was carried out for 1.5 hours, and dichloromethane was recovered at the same time; (4) The slurry was first crushed with a crushing pump with a gap of 4 mm between the rotary mill and the fixed mill, and then the slurry was crushed with a speed of 1500 rpm Separate the centrifuge for solid-liquid separation to obtain polycarbonate wet powder and mother liquor, and the mother liquor is used to manufacture the ...

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Abstract

The invention provides a preparation method of polycarbonate powder. The preparation method comprises the following steps of: under the condition of stirring, adding the polycarbonate powder based on water as a medium; dripping a polycarbonate solution at the temperature of 40-60 DEG C, wherein the polycarbonate solution is a polycarbonate dichloromethane solution prepared by a phosgene interface polycondensation method; after dripping, further heating for desolventizing, and recovering dichloromethane at the same time; and after desolventizing, crushing slurry by a crushing pump, and then carrying out solid-liquid separation to obtain wet polycarbonate powder and mother liquor, wherein the mother liquor can be recycled; and drying the wet polycarbonate powder to obtain the product. The preparation method has the advantages of simple equipment, mild operation conditions and low energy consumption, the mother liquor can be recycled, and industrialization is easily realized.

Description

Technical field [0001] The present invention involves a manufacturing method of polycarbonate powder. Specifically, it is a method for making polycarbonate powder from polycarbonate solutions made from the optical interface. Background technique [0002] Polycarbonate is an important engineering plastic product that is widely used in industries such as building materials, automobile manufacturing, and information storage. [0003] In the optical reducing polycarbonate process, the polycarbonate powder by polycarbonate solution is one of the technical problems of this process.China's patent application CN1048711A disclosed a method of hot water olic carbonate solution to make polycarbonate granular resin, including hot water containing non -solvents, where the dysplasia refers to benzene, toluene, chlorobenzene, orthodigohide, and ostericane, and ostericane., Anxane, etc.China's patent application CN1087647A disclosed a method of polymer polymer hot water sinking solvent, includin...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08L69/00
Inventor 陆春明郑亚清张寅孙吉肖炳兴顾志强金野
Owner JIANGSU YANGNONG CHEM GROUP
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