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

A technology of polymer and air pressure, which is applied in the field of manufacturing equipment for acrylic polymers, and can solve problems such as difficult screw operation

Active Publication Date: 2008-09-10
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sometimes, there are even polymers covering the shaft seal, making the screw difficult to run and other problems.
In addition, during long-term continuous operation, due to the fluctuation of the pressure of the reaction mixture introduced into the degassing device, the problem of accumulation of (meth)acrylic monomer or its polymer near the shaft seal part is more likely to occur.

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

[0096] The raw material composition 1 according to the following compounding ratio was supplied to a tank reaction device equipped with a stirring device, and the polymerization reaction was carried out under the conditions of a set polymerization temperature of 135° C. and an average residence time of 3 hours.

[0097] (raw material composition 1)

[0098] Methyl methacrylate (MMA) 98.0 parts by mass

[0099] Methyl acrylate (MA) 2.0 parts by mass

[0100] 0.25 parts by mass of n-octyl mercaptan

[0101] tert-butyl peroxide 3,5,5,-trimethylhexyl ester (for the total amount of MMA and MA)

[0102] 70 mass ppm

[0103] The reaction mixture extracted from the tank reaction device is heated to 220°C with a heater composed of a multi-tube heat exchanger, and then introduced into such as figure 1 In the uniaxial degassing outlet device (Φ150mm, screw L / D28) with the structure shown, degassing treatment (260°C, pressure at outlet 42-0.02MPa, p...

Embodiment 2

[0106] A (meth)acrylic polymer was produced in the same manner as in Example 1 except that the gas introduced from the gas inlet of the degassing outlet was changed to air. Even after 5 days had elapsed after the start of production, no deposits were found on the screw shaft seal.

[0107] The obtained (meth)acrylic polymer slices were molded at a cylinder temperature of 260° C. to produce a 100 mm × 100 mm × 2 mm plate. It was confirmed that the obtained plate had no foreign matter, and the appearance was slightly yellow and transparent.

Embodiment 3

[0109] A (meth)acrylic polymer was produced in the same manner as in Example 1 except that a mechanical back pressure valve was provided between the heater and the degassing device. As the mechanical back pressure valve, R-F-93703-3-1 (trade name, 40×40 back pressure valve for high pressure) manufactured by Kishikawa Special Valve Co., Ltd. was used. The initial setting pressure of the back pressure valve is 2.1MPa.

[0110] The operation was carried out for 5 consecutive days, and the pressure of the reaction mixture supplied to the degassing device could always be kept constant (2.1 MPa), and no deposits were found in the seal part of the screw shaft after 5 days after the start of production.

[0111]Using the chip of the (meth)acrylic polymer obtained 5 days after the start of production, injection molding was performed at a cylinder temperature of 260° C. to produce a 100 mm×100 mm×2 mm plate. It was confirmed that the obtained board had no foreign matter and was transpa...

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PUM

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Abstract

The present invention provides a manufacturing apparatus and a manufacturing method of a (meth)acrylic polymer where no impurity is interfused, and the polymer desaeration extruding device, wherein, the shaft seal part has no polymer adhered even in a long running term. The polymer desaeration extruding device has an outlet for providing reaction mixture containing polymer and volatilization component, an outlet for discharging the polymer separated from said reaction mixture, one or more outlets capable of discharging said volatilization component separated from said reaction mixture, a rotatable screw and the shaft seal part positioned around the opening having been inserted with the screw for keeping the inner gas tightness, and an air guiding inlet is provided closer to said shaft seal part comparing with any position provided with outlet and the mixture providing outlet. Otherwise, the manufacturing apparatus and the manufacturing method of a (meth)acrylic polymer use the desaeration extruding device.

Description

technical field [0001] The present invention relates to a degassing apparatus used in the production of (meth)acrylic polymers and the like by a continuous polymerization method, and a production apparatus and method for producing (meth)acrylic polymers using the same. Background technique [0002] Polymethyl methacrylate (PMMA) and other (meth)acrylic polymers produced by polymerizing (meth)acrylic monomers such as methyl methacrylate have excellent transparency, weather resistance and excellent appearance , can be applied to many 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 use of auxiliary agents such as suspending and dispersing agents, they are mixed into (meth)acrylic polymers to reduce their transparency, so ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/01C08F20/02B01D19/00
Inventor 德井正树石坂浩二
Owner MITSUBISHI CHEM CORP
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