Foaming particle manufacturing device using polyolefin-based resin particle and method for manufacturing said foaming particle

A polyolefin resin, foamed particle technology, applied in chemical instruments and methods, mixers with rotary stirring devices, transportation and packaging, etc., to achieve the effect of shortening production cycle time and reducing power

Active Publication Date: 2019-03-01
KANEKA CORP
13 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, in Patent Document 2, there is no description abou...
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Method used

By using the baffle plate 10 of said shape, the stagnation near the baffle plate 10 at the liquid level of the aqueous dispersion in the container 1 disappears, and the downflow from the center of the liquid surface toward the bottom becomes stronger, so it can Further, the vertical mixing property of the aqueous dispersion is improved. In addition, since the up-and-down mixing property becomes better, the stirring rotation speed (rpm) can be reduced, and thus the power required for stirring can be reduced. In addition, the unit stirring energy can also be reduced. In addition, the term "stirring rotation speed (rpm)" mentioned here means the rotation speed of the stirring blade 5 per minute.
Fig. 11 is the schematic front view of the foamed particle production device of one embodiment of the present invention that shows that agitating wing 5 and baffle plate 10 are installed, wherein, this agitating wing 5 is provided with bulge 3a The stirring blade 3 is constituted, and the baffle plate 10 has a wide inclined portion 12 on the upper portion. By using the foamed particle manufacturing apparatus of such a structure, the up-down mixing property of an aqueous dispersion can be made more favorable, and foaming can be suppressed. In addition, as will be described later, in the foamed particle manufacturing apparatus, one end of the container 1 may be opened to release the aqueous dispersion containing the polyolefin-based resin particles to a pressure lower than the pressure in the container 1. During the process of producing expanded particles in an atmosphere of high pressure, the stirring speed is reduced in accordance with the height of the liquid level of the aqueous dispersion in the container 1 . Thereby, foaming of the aqueous dispersion can be further reduced, and the release amount can be kept more constant.
In the foamed particle manufacturing apparatus of one embodiment of the present invention, by making the aqueous dispersion in the container be the state that flows consistently from top to bottom, that is, make the inside of the container be a good up-down mixing state, it is possible to The amount of foam generated is reduced, whereby homogeneous expanded particles can be obtained. In addition, the production cycle time (time required for production) can be shortened, and the power required for stirring can be reduced. In this specification, the degree of mixing properties based on consistent flow from top to bottom may be referred to as "up and down mixing properties" regarding the water-based dispersion in the container. A good up-and-down mixing state means the same thing as a good up-and-down mixing property.
In the foamed particle production apparatus of one embodiment of the present invention, by making d/D2 and b2/d of stirring blade 5 greater than d/D2 and b2/d of common stirring blade, water system dispersion can be made The up and down mixing is better. However, when d/D2 exceeds 0.375, there is a tendency that the amplitude flow (radial discharge flow) becomes stronger and layer separation occurs, and when d/D2 is less than 0.255, the flow becomes weak and the up-down mixing property tends to deteriorate. poor tendency.
In the manufacturing method of the foamed particle of one embodiment of the present invention, by using the foamed particle manufacturing device of one embodiment of the present invention, in the stirring process of the aqueous dispersion that comprises polyolefin resin particle, Can reduce foaming.
[0084] In the expanded particle manufacturing apparatus according to one embodiment of the present invention, it is preferable to provide a baffle (baffle) 10 in the container 1 in order to make the vertical mixing state in the container 1 favorable. By providing the baffle plate 10 in the vicinity of the side wall surface in the container 1, the state of vertical mixing in the container 1 can be further improved. FIG. 8 is a schematic front view showing an example of the baffle plate 10 provided in the expanded bead manufacturing apparatus according to the embodiment of the present invention. FIG. 8( a ) and FIG. 8( b ) are front views showing a baffle 10 having an inclined portion 12 at the top. (c) of FI...
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Abstract

The present invention addresses the problem of providing a foaming particle manufacturing device that produces a good vertical mixing state inside a container to obtain a homogeneous foaming particleand is capable of reducing power for mixing. Provided is a foaming particle manufacturing device in which a mixing blade 5 is provided at a position at which a ratio (L1/L2) of a distance L1 from thebottom of a container 1 to a center in a depth direction of the container 1 of a mixing base 4 in the mixing blade 5 to a depth L2 of the container 1 is 0.01 or more and 0.2 or less.

Application Domain

Rotary stirring mixersTransportation and packaging +2

Technology Topic

PolyolefinPolymer chemistry +1

Image

  • Foaming particle manufacturing device using polyolefin-based resin particle and method for manufacturing said foaming particle
  • Foaming particle manufacturing device using polyolefin-based resin particle and method for manufacturing said foaming particle
  • Foaming particle manufacturing device using polyolefin-based resin particle and method for manufacturing said foaming particle

Examples

  • Experimental program(12)
  • Comparison scheme(3)

Example

[0204] (Example 1 to Example 4 and Comparative Example 1 and Comparative Example 2)
[0205] In a container capable of observing the inside, an aqueous dispersion containing polyolefin resin particles, water, and a dispersant was stirred using the stirring blade of one embodiment of the present invention and the special H-shaped stirring blade of the prior art, and the vertical direction was verified The mixing efficiency.

Example Embodiment

[0206] [Example 1]
[0207] In a transparent acrylic resin container (capacity M=30 liters, straight body inner diameter D1=290mm, depth L2=540mm) that can observe the inside, there will be 4 stirring blades (two pairs of stirring blades facing the stirring shaft) The distance L1 from the bottom of the container to the center of the stirring base of the stirring wing in the depth direction (vertical direction) of the container is set on the central axis of the container. In the position of 32 mm, the length d of the stirring blade is 87 mm, and it is inclined at an inclination angle θ1=45° with respect to the stirring shaft, and the width b2 is 52 mm. In addition, in the container, a baffle plate (total length L4 = 470 mm, width = 12 mm, thickness = 2 mm) was provided along the side wall at a position directly opposite to the axis of the stirring blade.
[0208] 100 parts by weight of a particle weight of 1.3 mg of polyolefin resin particles, 200 parts by weight of pure water, 0.4 parts by weight of calcium phosphate as a dispersant, and 0.01 parts by weight of alkyl sulfonate as a dispersion aid Sodium was put into the container and stirred and mixed for 3 minutes under the condition that the rotation speed of the stirring blade was 350 rpm. Then, the weight ratio of the polyolefin resin particles near the liquid surface of the stirred and mixed aqueous dispersion, the weight ratio of the polyolefin resin particles near the bottom, the stagnation of the flow at the bottom of the container, and the foam layer in the aqueous dispersion The height in the vertical direction in the container was measured, and the measured results are shown in Table 1 along with various conditions.

Example Embodiment

[0209] [Example 2]
[0210] The shortest distance C from an arbitrary point on the lower line of the stirring blade to the inner wall of the container is 6mm, and a trapezoidal stirring blade with a bulging part is set to match the shape of the bottom of the container (the length of the stirring blade d was 87 mm, width b2 was 72 mm), and the position of the stirring blade was changed to a position where the distance L1 was 30 mm, except that the same operation was performed using the same device as in Example 1, and stirring and mixing were performed.
[0211] Then, the weight ratio of the polyolefin resin particles near the liquid surface of the stirred and mixed aqueous dispersion, the weight ratio of the polyolefin resin particles near the bottom, the stagnation of the flow at the bottom of the container, and the foam layer in the aqueous dispersion The height in the vertical direction in the container was measured, and the measured results are shown in Table 1 along with various conditions.

PUM

PropertyMeasurementUnit
Length240.0mm

Description & Claims & Application Information

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