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Degasifying pressing out device,device and method for mfg. polymer therewith

A polymer, air pressure technology, applied in separation methods, liquid degassing, chemical instruments and methods, etc., can solve the problems of mixing additives, difficult to manufacture acrylic polymers, etc.

Active Publication Date: 2009-01-07
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this time, part of the added additives will be discharged from the outlet together with the volatile components, so it is difficult to manufacture (meth)acrylic polymers containing an accurate amount of additives.
Not only that, but there is also the problem of additives mixed into the volatile components discharged from the outlet

Method used

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  • Degasifying pressing out device,device and method for mfg. polymer therewith
  • Degasifying pressing out device,device and method for mfg. polymer therewith
  • Degasifying pressing out device,device and method for mfg. polymer therewith

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] In a tank reactor (polymerization tank) equipped with a stirring device, feed the raw material composition mixed according to the following proportions, and carry out the polymerization reaction under the reaction conditions of a set temperature of 135° C. and an average residence time of 3 hours.

[0093]

[0094] Methyl methacrylate (MMA) 98.0 parts by mass

[0095] Methyl acrylate (MA) 2.0 parts by mass

[0096] 0.25 parts by mass of n-octyl mercaptan

[0097] tert-butylperoxy-3,5,5,-trimethylhexyl ester

[0098] (for the total amount of MMA and MA) 70ppm (mass)

[0099] The reaction mixture extracted from the tank reaction device is heated to 220 °C in a heater composed of a multi-tube heat exchanger, and then introduced into the figure 1 In the single-screw degassing outlet device (Φ150mm, screw L / D28) with the structure shown, degassing treatment [260°C, pressure at outlet 42-0.02MPa (gauge pressure), pressure at outlet 43-0.097MPa (gauge pressure) )] to obt...

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Abstract

Provided is a devolatilizing extrusion apparatus capable of incorporating an additive in an accurate amount into a polymer without causing contamination of volatile components with the additive, and a manufacturing apparatus and a manufacturing method capable of manufacturing a (meth)acrylic polymer containing the additive in an accurate amount. The devolatilizing extrusion apparatus is provided with a reaction mixture-feeding port capable of feeding a reaction mixture containing the polymer and the volatile components, a polymer-discharging port capable of discharging the polymer separated from the reaction mixture, one or more vents capable of discharging the volatile components separated from the reaction mixture, a rotatable screw, and an additive-feeding port installed at a position nearer to the polymer-discharging port than the position of the vent installed at the nearest position from the polymer-discharging port, and further provided with a mechanism for causing the polymer to temporarily stay between the position of the vent installed at the nearest position from the additive-feeding port and the position where the additive-feeding port is installed.

Description

technical field [0001] The present invention relates to a degassing device used when producing a (meth)acrylic polymer by a continuous polymerization method, a production device and a production method of a (meth)acrylic polymer using the same. Background technique [0002] Polymethyl methacrylate (PMMA) and other (meth)acrylic polymers prepared by polymerizing (meth)acrylic monomers such as methyl methacrylate have transparency, weather resistance, and excellent appearance. characteristics, and can be applied to various fields such as lighting, billboards, and vehicles. It is also widely used in optical applications such as optical lenses, disk substrates, and plastic optical fibers. [0003] As a method for producing a (meth)acrylic polymer, generally, a suspension polymerization method is often used. However, due to the suspending and dispersing agent and other auxiliary agents used, it is mixed into the (meth)acrylic polymer, making it poor in transparency and not suit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B7/24C08F20/06C08F2/01B01D19/00C08J3/20C08F6/10
Inventor 德井正树石坂浩二
Owner MITSUBISHI CHEM CORP