SG177264A1

SG177264A1 - Rubbery polymer extrusion-drying apparatus and process for producing rubbery polymer

Info

Publication number: SG177264A1
Application number: SG2011093465A
Authority: SG
Inventors: Toshikazu Kuriki; Masataka Masutani
Original assignee: Jsr Corp
Priority date: 2009-07-22
Filing date: 2010-07-13
Publication date: 2012-02-28
Also published as: JPWO2011010578A1; TW201114574A; JP5041101B2; TWI515100B; DE112010003023T5; WO2011010578A1

Abstract

RUBBERY POLYMER EXTRUSION-DRYING APPARATUS AND PROCESS FOR PRODUCING RUBBERY POLYMERDisclosed are an expansion-type extrusion dryer for a rubbery polymer and a process for producing a rubbery polymer, which overcome the disadvantage of occurrence of string-shaped crumbs in expansion drying of the rubbery polymer. The extrusion dryer for a rubbery polymer of the present invention has a cutter device (5) for cutting an extruded rubbery polymer near the extrusion part (4) for extruding crumb consisting of the rubbery polymer. The cutter device (5) has a blade part (51) having a plated blade (512).Fig. 2

Description

SPECIFICATION

RUBBERY POLYMER EXTRUSION-DRYING APPARATUS AND PROCESS FOR

PRODUCING RUBBERY POLYMER

TECHNICAL FIELD

[0001]

The present invention relates fo a rubbery polymer extrusion dryer and 4 process for producing a rubbery polymer. Specifically, the present invention relates to a rubbery polymer extrusion dryer which overcomes the disadvantage of formation of string-shaped crumb in expansion drying of the rubbery polymer.

BACKGROUND ART

{00021

In the case of producing a rubbery polymer via solution polymerization, a polymer aggregate (water-conigining crumb) containing water in an amount of about 13% to 50% by weight, a small amount of a polymerization solvent and an unreacted monomer is dried using a dryer after completion of polymerization to obtain a product.

The product is normally required to have a water content of 1% or less by weight.

Examples of the dryer include a band dryer, a vent-type extrusion dryer, an expansion-type extrusion dryer, and the hke, Among these, the expansion-type extrusion dryer is widely used to dry various rubbery polymers due to a compact drying syste configuration and excellent energy efficiency.

[6003]

The expansion-type extrusion dryer is configured so that a waler-containing crumb {that may be predried using a press or the like) as g drying target, which is supplied from a hopper of the extrusion dryer 1s transferred toward the downstream side and compressed inside a cylinder due to rotation of a screw named worm. In this case, the temperature and pressure of the rubbery polymer become high due to a heat applied i from the cylinder of the exirusion dryer and a heat by a worm shear heat, and the rubbery polymer is extruded to the atmosphere through a die nozzle while water vapor and the like are explosively discharged to the atmosphere. The water content in the drving target thus decreases rapidly, so that drying (i.e., expansion drying) is conducted. {3004]

In the case of drying a rubbery polymer using such an expansion-type extrusion dryer, the shape of the crumb discharged through the die nozzle at the end of the extrusion dryer is normally granular. A string-shaped crumb may be formed depending on the properties of the rubbery polymer. I the siring-shaped crumb is formed, in the subsequent stage of the extrusion dryer {e.g., 8 conveying equipment including a vibration-type conveyer, a bell conveyer, or the like, or a drying equipment), aggregation of the crumb may be oceurred, volatile components (mainly water) remained in the polymer may not be evaporated, and an average drying speed may not be reached. As a result, a large amount of water may be remained in the product.

Moreover, a conveying machine (e.g., belt conveyer) may be clogged by the aggregated siring-shaped crumb, and the transfer operation may be hindered.

FO005]

Therefore, attempts have been made to provide a cutter device similar to that used for a resin extrusion/granulation production process or the like at the end of the extrusion dryer in order to cut string-shaped crumb into granules. Patent Document discloses an extrusion dryer provided with such a cutter device.

PRIOR TECHNICAL LITERATURE

PATENT BOCUMENT

[0006]

Patent Document 1; JP-A HO9-207199

SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[00071

In the case of cutting a string-shaped crumb using a related-art cutter device, the string~shaped crumb may twine around the blade, and the cutting operation may be hindered. Moreover, the string-shaped crumb may not be sufficiently cut into granules, aggregation of the crumb may be ocourred, volatile components (mainly water) remained in the polymer may not be evaporated, and a large amount of water roay be remained in the product in the subsequent stage of the extrusion dryer {e.z., conveying equipment or drying equipment). Additionally, stainless steel is normally used as the material for the blade, however, when a cutter blade made of stainless steel for the expansion-type extrusion dryer is used, the cutter blade may be worn out or broken dus to insufficient hardness due to the pressure of water vapor and the impact of the rubber discharged through the die nozzle at a high speed. [000%]

Therefore, it has been desired to provide a rubbery polymer extrusion dryer including a cutter device that can advantageously cut crumb into granules even if the shape of a crumb by expansion drying becomes siring-shaped, and that can uniformly and sufficiently dry a rubbery polymer having a wide range of properties.

[0009]

The present invention was conceived in view of the above situation, and an object thereof is to provide a rubbery polymer extrusion dryer which overcomes the disadvantage of formation of string-shaped crumb in expansion drying of the rubbery polymer.

MEANS FOR SOLVING THE PROBLEMS

[0010]

The present invention is as follows. {1} An expansion-type extrusion dryer for a rubbery polymer, characterized in that a cutter device for culting an extruded rubbery polymer is disposed near an extrusion part through which a rubbery polymer is extruded, and that the cutter device comprises a blade part having a plated blade.

{2} The expansion-type extrusion dryer for a rubbery polymer according to {1} above, wherein the plating treatment of the plated blade is a hard chromium plating treatment or a nickel-phosphorus plating treatment.

{3} The expansion-type extrusion dryer for a rubbery polymer according to (1) or (2) above, wherein the extrusion part comprises a die, and wherein the blade part and the die are disposed at a clearance of 2 mm to 100 mm.

{4} An expansion-type extrusion dryer for a rubbery polymer, characterized in that a cutter device for cutting an extruded rubbery polymer is disposed near an extrusion part through which a rubbery polymer is extruded, and that the cutter device comprises a center part and a blade part having 2 to 10 blades radially extending from the center part,

(8) The expansion-type extrusion dryer for a rubbery polymer according to (4) above, wherein the blades are plated.

{6} The expansion-type extrusion dryer for a rubbery polymer according to (5) above, wherein the plating treatment of the plated blade is a hard chromium plating treatment or a nickel-phosphorus plating treatment.

{7} The expansion-type extrusion dryer for a rubbery polymer according to any one of {4} to {6} above, wherein the exirusion part comprises a die, and wherein the blade part and the die are disposed at a clearance of 2 num {o 100 mm.

{83 A method for producing a rubbery polymer using the extrusion dryer according to any one of {1} to (3) above, characterized by comprising an extrusion process in which the rubbery polymer is subjected to drying and extruding, and a cutting process in which an extruded rubbery polvimer is subjected to cutting.

{9} A method for producing a rubbery polymer using the extrusion dryer according to any one of (4) to (7) above, characterized by comprising an extrusion process in which the rubbery polymer is subjected to drying and extruding, and a cutling process in which an extruded rubbery polymer is subjected to cutting.

EFFECT OF THE INVENTION

[0011

Since the extrusion dryer according to the present invention includes a specific cutier device having a blade part that exhibits excellent wear resistance, it is possible to sufficiently suppress wear and breakage of the blade (particularly the blade edge) due to the impact of the rubbery polymer (crumb) and water vapor discharged doring expansion drying, Additionally, the crumb can be more easily cut into granules even if the discharged crumb during expansion drying is in a siring-shaped.

Moreover, since the extrusion dyer according to another present invention includes a specific cutter device having 2 to 10 blades, the crumb hardly twine around the blade part and can be more easily cut into granules even if the discharged crumb during expansion drying is in a string-shaped.

Since the method for producing a robbery polymer of the present invention utilizes a specific robbery polymer extrusion dryer, a uniformly and sufficiently dried rubbery polymer can be easily obtained regardless of the properties of the rubbery polymer,

BRIEF DESCRIPTION OF THE DRAWINGS

[06121

FIG 1 is a schematic view illustrating an extrusion dryer according to Exaruple.

FIG 2 is an enlarged view showing the main part of the extrusion dryer shown in

FIG 1.

FIG. 3 is a schematic front view showing a blade part of an extrusion dryer according to Example 1.

FIG. 4 is a schematic rear view showing a blade part of an extrusion dryer according to Example 1,

FIG. § is a schematic side view showing a blade part of an extrusion dryer according to Example 1.

FIG 6 is an enlarged view showing the main part of the blade part shown in FIG

DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0013]

Hereinafter, the present invention is described in detail. 1. Rubbery polymer extrusion dryer

The rubbery polymer extrusion dryer in the present invention (hereinafter, also referred 10 as “extrusion dryer (I)”) is characterized in that a cutter device for cutting an extruded rubbery polymer is disposed near an extrusion part through which a rubbery polymer is extruded, and that the cutter device comprises a blade part having a plated blade.

The rubbery polymer extrusion dryer in another present invention (hereinafter, also referred to as “extrusion dryer (II)7} is characterized in that a cutter device for cutting an extruded rubbery polymer is disposed near an extrusion part through which a rubbery polymer is extruded, and that the cutter device comprises a center part and a blade part having 2 to 10 blades radially extending from the center part.

[0014]

The expansion-type extrusion dryers (I) and (II) in the present invention generally include, as shown schematically extrusion dryer 1 in FIG 1, a cylinder 21 that includes therein a screw 22 for extruding a water-containing crumb containing a rubbery polymer as a drying target; a hopper 3 that is disposed on one end of the cylinder 21 and is used to supply the water-containing crumb to the cylinder 21; an extrusion part 4 that is disposed on the other end of the cylinder 21 and includes a die 41 having a die nozzle; and a cotter device 5 that is disposed near the extrusion part 4 and cuts the rubbery polymer (crumb) that is extruded through the extrusion part 4. {00157

The extrusion dryer 1 shown in FIG 1 is configured so that the water-containing crumb supplied to the eylinder 21 through the hopper 3 is transferred due to rotation of the screw 22 to the extrusion part 4 while compressing. In this case, the temperature i and pressure of the water-containing crumb become high due to a heat applied from the cylinder 21 and a shear heat applied by the screw 22. Then, the crumb is extraded to the atmosphere through the die nozzle formed in the die 41 while water vapor and the like are explosively discharged to the atmosphere, and at the same time the crumb is cut into small pieces by the cutter device 5. Thereby, water content in the water-containing crumb decreases rapidly to complete drying (i.e, expansion drying).

F016]

The cutter device of the extrusion dryer (1) in the present invention includes a blade part and the blade part has a plated blade. Therefore, the blade part exhibits excellent wear resistance, so that it is possible to sufficiently suppress wear and breakage of the blade (particularly the blade edge) due to the impact of the crumb and water vapor discharged during expansion drying. {0017}

The plating treatment applied to the blade {cutter blade} is not particularly

Hmnited so long as excellent wear resistance can be obtained. For example, a hard chromium plating treatment, a nickel-phosphorus (Ni-P) plating treatment, or the like may be used.

It is preferable that the plating treatment be applied to at least the edge of the cutter blade.

[6018]

The blade part in the cutter device of the extrusion dryer (I) generally includes a center part that is secured on 4 rotary shaft extending from a drive part of the cutter device, and a blade (plated blade above) that is arranged in the center part.

It is preferable that a plurality of cutier blades extend radially. The number of cutter blades is not particularly limited. It is preferably in the range from 2 to 10, more preferably from 3 to 8, and further preferably from 3 to 6. When the munber of cutter blades is 2 to 10, the crumb hardly twine around the blade part and can be wore easily cut into granules even if the discharged crumb during expansion drying is ina string-shaped.

In addition, the cutter device of the extrusion dryer (11) according to the present invention includes a blade part. The blade part includes a center part that is secured on a rotary shaft extending from a drive part of the cutter device, and 2 to 10 blades radially extending from the center part. Therefore, the crumb can be more easily cut into granules even if the discharged crumb during expansion drying isina siring-shaped,

The number of cutter blades is preferably in the range from 2 to 10, more preferably from 3 to 8, and further preferably from 310 6. When the number of cutter blades is 2 to 19, the crumb hardly twine around the blade part and can be more easily cot into granules even if the discharged crumb during expansion drying isina string-shaped. [00201

The cutter blade in the blade part of the cutier device in the extrusion dryer {I} is preferably plated. This makes it possible to sufficiently suppress wear and breakage of the blade (particularly the blade edge) due to the impact of the crursh and water vapor discharged during expansion drying. The wear resistance of the cutter blade can be improved more.

The description given above in connection with the plating treatment for the cutter blade in the extrusion dryer (1) may be applied. 10021]

In the blade part of the cutier device in the extrusion dryers (I) and (II), the angle (angle 81) formed by a surface 512A of the cutter blade that faces the extrusion part and a plane P {virtual plane} that is perpendicular to an axis 21c of the cylinder 21 (le, the tilt angle of the surface 512A of the cutter blade that faces the extrusion part with respect io the plane P that is perpendicular to the axis 21¢ of the cylinder 21), as shown in FIG. 6, is preferably in the range from 3° to 20°, more preferably from 5° to 15%, and further preferably from 7° to 10°. When the angle 01 is in the range from 3° to 20°, impacts of the crumb and water vapor discharged from the extrusion part are not §

directly given to the cutter blade, that is to say, impacts given to the cutter blade are reduced. As a result, damage to the blade can be suppressed. Additionally, the crurtth can be efficiently cut even if the crumb is in a string-shaped. Moreover, a situation in which the space between the extrusion part and the blade part is clogged by the crumb can be sufficiently suppressed. [00221 fu the blade part of the cutter device in the extrusion dryers (1) and (II), the angle (angle 82) formed by a surface 5128 of the cutter blade that is opposite to the extrusion part and the plane P that is perpendicular to the axis 2c of the cylinder 21 (L.e., the tilt angle of the surface 5128 of the cutter blade with respect to the plane P that is perpendicular to the axis 21¢ of the cylinder 21), as shown in FIG 6, is preferably in the range from 5° to 50°, more preferably from 15” to 40°, and further preferably from 30° 035%, When the angle 82 is in the range from 5° to 50°, the crumb can be efficiently cut even if the crurnb is in a string-shaped.

[0023]

In the cutter device in the extrusion dryers (I) and (If), the blade part and the die of the extrusion part are preferably disposed at a given clearance (see, the clearance “x” of the blade part 51 and the die 41 shown in FIG 2). The clearance is preferably in the range from 2 to 100 mum, and more preferably from 5 t0 20 mm. When the blade part and the die are disposed at a given clearance, and particularly when the blade part and the die are disposed at a clearance of 2 to 100 rom, the impact of the water vapor discharged cau be dissipated from the surface of the cutier blade during expansion drying while cutting the extruded rubbery polymer discharged through the die.

Moreover, a situation in which the space around the die nozzle is clogged by the crumb can be sufficiently suppressed.

[6024] ‘The cutter device of the extrusion drvers {I} and {II} may utilize an arbitrary cutting method. For example, the cutter device may utilize a center cutting method in which the center of the cutter shaft coincides with the center of the die in the extrusion dryer, or a side cutting method in which the center of the cutter shaft is offset from the center of the die in the extrusion dryer. 1t is desirable to use the center cutting method that can implement an efficient cutting operation when the die nozzles are circumferentially formed in the die.

[0025]

The cutter device in the extrusion dryers (I) and (1) preferably include an inverter device that can control the rotational speed of the cutter blade.

[0026]

The configurations of the eylinder and the screw in the extrusion dryers (I) and (IY) are not particularly limited. The cylinder and the screw may be configured in the same manner as those provided in a known extruder or the like. A heating means ora cooling means may be provided outside the cylinder. Additionally, the number of the screw provided in the extrusion dryer is not particularly limited. The extrusion dryer of the present invention may be a single-screw extrusion dryer, or a multi-screw extrusion dryer.

[0027]

The configurations of the hopper and the die in the extrusion dryers (I) and (1) are not particularly Hmited. The hopper and the die may be configured in the same manner as those provided in a known extruder or the ke, The shape, number, position, and the like of the die nozzle formed in the die may be appropriately determined depending on the properties of the rubbery polymer. Specific exaraples of the shape of the die nozzle include a circular hole, a cross hole, a rectangular hole (slot), and the like.

[0028]

Additionally, the rubbery polymer that may be dried using the extrusion dryer of the present invention is not particularly limited. Example thereof includes a diene-based rubber such as a styrene butadiene rubber {SBR}, a butadiene rubber (BR), an isoprene rubber (IR), a styrene isoprene block polymer (SIS), a styrene butadiene block polymer (SBR), a nitrile butadiene rubber (NBR), and a chloroprene rubber (CR); an glefin robber such as a butyl rubber (IIR), an ethylene propylene rubber (EPM or

EPDM), an acrylic rubber, a chlorosulfonated polyethylene rubber, and a fluororubber; a silicone rubber, a polyurethane rubber, and the like. 10029] 2. Method for producing rubbery polymer

The method for producing a rubbery polymer in the present invention (hereinafter, referred to as “rubbery polymer production method (IY) is a method for producing a rubbery polymer using the above-mentioned extrusion dryer (I), and is characterized by comprising an exirasion process in which the rubbery polymer is subjected to drying and extruding, and a cutting process in which an extruded rubbery polymer is subjected to cutting.

The method for producing a rubbery polymer in the present invention (hereinafter, referred to as “rubbery polymer production method (3}”) is a method for producing a rubbery polymer using the above-mentioned extrusion dryer (1), and is characterized by comprising an extrusion process in which the rubbery polymer is subjected to drying and extruding, and a cutting process in which an extruded rubbery polymer is subjected to cutting.

[0030]

In the extrusion process according to the rubbery polymer production methods (Iy and (II), the water-containing crumb (rubbery polymer) obtained by polymerization process is subjected to expansion drying using the extrusion dryer. Specifically, the water-containing crumb is supplied as a drying target into the cylinder in the extrusion dryer through the hopper, and then transferred due to rotation of the screw to the extrusion part while compressing. In this case, the temperature and pressure of the water-containing crumb become high due to a heat applied from the cylinder and a shear heat applied by the screw. Then, the crumb is extruded to the atmosphere through the die nozzle formed in the die while water vapor and the like are explosively discharged io the atmosphere. {0031}

In the cuiting process according to the rubbery polymer production methods (I)

and (113, the discharged crumb through the die nozzle during expansion drying is subjected fo culling using the cutler device included in the extrusion dryer.

[0032]

In the cutiing process, the rotational speed of the blade part {cuiter blade} of the cutter device may be appropriately adjusted depending on the properties of the rubbery polvmer, processing amount, number of the die nozzle, and the ke. The dimension of the granular crumb obtained in the cutting process is preferably in the range from | to em, and more preferably from 110 3 om

In the case of using an expansion-type extrusion dryer in which the nominal size of the cylinder is 108, the rotational speed of the blade part is preferably in the range from 400 to 1,800 rpm, more preferably from 300 to 1,600 rpm, and further preferably from 600 to 1,000 rpm. Additionally, in the case of using an expansion-type extrusion dryer in which the nominal sive of the cylinder is 148, the rotational speed of the blade part is preferably in the range from 300 to 1,600 rpm, more preferably from 400 to 1,400 rpm, and further preferably from 500 to 1,200 mpm.

EXAMPLES

10033)

Hereinafter, the present invention is specifically explained by Examples using some drawings. Note that the invention is not limited to the following Examples.

[0034]

Exaraple 1 {1} Expansion-type extrusion dryer {1-1} Configuration of expansion-type extrusion dryer

An expansion-type extrusion dryer 1 according to Example 1 is provided, as shown in FIG 1, with a cylinder 21 (nominal size: 14B) including a screw 22 therein, a hopper 3 disposed on one end of the cylinder 21, an extrusion part 4 disposed on the other end of the cylinder 21, and a cutter device 5 (for center cutting method) disposed near the extrusion part 4.

[0035]

The extrusion part 4 includes a die 41 in which a number of die nozzles (hole shape: rectangular (slot) (not shown) are formed. As shown in FIG. 2, the cuter device § is provided so that the extrusion part 4 and the cutter device 5 are disposed at a clearance x (x=2 to 100 mm), {0036]

The cutter device 5 has a blade part 51 as shown in FIGS. 1 t0 6. The blade part S1 includes a center part 511 that is secured on a rotary shafl 52 extending from a drive part of the cutter device 5, and four stainless steel cutter blades 512 extending radially from the center part 511.

An edge 513 of each cutter blade 512 is plated by hard chromium plating treatment.

The cutter blade 512 is configured, as shown in FIG. 6, so that the tilt angle (angle 81) of a surface 512A of the cutter blade 512 that faces the extrusion part with respect to a plane P that is perpendicular to an axis 21c¢ of the cylinder 21 is 7.5%, and the tilt angle (angle 02) of a surface S128 of the cutter blade 512 that is opposite to the extrusion part with respect to the plane P that is perpendicular to the axis 21c of the cylinder 21 is 30°

[0037] (1-2) Function of expansion-type exirasion dryer

The function of the expansion-type exirusion dryer 1 is described below.

A water-containing crumb {rubbery polymer) synthesized by polymerization process is supplied as a drying target to the hopper 3 of the extrusion dryer 1, and supplied to the cylinder 21 through the hopper 3. The water-containing crumb is transferred due to rotation of the screw 22 to the extrusion part 4 while compressing.

In this time, the temperature and pressure of the water-containing crumb become high due to a heat applied from the cylinder 21 and a shear heat applied by the screw 22,

The crumb is extruded into a duct § of atmosphere through the die nozzies formed in the die 41 while water vapor and the like are explosively discharged to the atmosphere, and at the same time the crumb is cut into small pieces by the cutter device 5. Thereby, water content in the water-containing crumb decreases rapidly fo complete drying (Le, expansion drying). The crumb (fragment) after the expansion drying and cutting into granules is transferred to a conveyor including a drying equipment through the duct 6. {0038} (2) Drying experiment using expansion-{ype extrusion dryer (2-1) Drying method

A drying experiment for a water-containing crumb was performed using the expansion-type extrusion drver described in (1). The water-containing crumb is a rubbery polymer {styrene-butadiene (SBR) copolymer) for which the water content {residual volatile content) was adjusted to 8% to 10% by weight using a drainer and a screw-type dryer.

The goal in the drying experiment was to obtain a product having a water content of 19% or less by weight, by expansion drying the water-containing crumb, cutting the crumb using the cutter device, and using a vibration-type conveyor and a ventilation-type belt conveyor. The blade part 51 and the extrusion part 4 shown in

Fiz 2 were disposed at a clearance of § 10 10 mm. The rotational speed of the blade part 51 was set to 600 to 1,000 rpm, the processing amount was 5 t/h, and the rotational speed of the screw was set to 250 rpm. A heated aly was blown, as shown in FIG. §, from the extrusion part in the extrusion dryer to the crursb discharged through the die nozzle formed in the die through the duct, and the crumb was transferred to the subsequent conveyor,

The shape and water content of the resultant product, and the operation stability of the extrusion dryer were evaluated. The evaluation rosulis are shown in Table 1.

[0039]

The water content in the product was caleulated by the following equation.

Water content in product (%) = (water content) / (weight of dried polymer + water content) X 160

[0040] id

Example 2

The rubbery polymer was dried in the same manner as those in Example 1, except that a blade part including a center part and twenty cutter blades by a hard chromium plating treatment and extending radially from the center part was used as the blade part of the cutter device, and the rotational speed of the blade part was set to 100 to 800 rpm. The resultant product was evaluated in the same manner as those in

Example 1. The evaluation results are shown in Table 1.

F00411

Example 3

The rubbery polymer was dried in the same manner as those in Example 1, except that a blade part including a center part and four non-plated cutter blades extending radially from the center part was used as the blade part of the cutter device.

The resultant product was evaluaied in the same manner as those in Example 1. The evaluation results are shown in Table 1.

[0042]

Comparative Example

The rubbery polymer was dried in the same manner as those in Example 1, except that expansion drving was performed without providing the cutter device (le, without cutting the discharged crumbs). The resultant product was evaluated in the same manner as those in Example 1. The evaluation results are shown in Table ©

[0043]

Comparative Example 2

The rubbery polymer was dried in the same manner as those in Example |, except that a blade part including a center part and twenty non-plated cutter blades extending radially from the center part was used as the blade part of the cutter device, the blade pari and the exirusion part were disposed at a clearance of 2 to 4 yun, and the rotational speed of the blade part was set to 100 to 250 rpm. The resultant product was evaluated in the same manner as those in Example 1. The evaluation results are shown in Table 1.

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UR 3 3 Voy 1 i ior nfm } i Poe Sidi i i 3 a i i Fees i Loonies i Tne saab x 1 imma i i _ i referee i i 8 i

P I. Vo i ¥ + 2 Pom i } i i Rat yo i 3 — i Bog POR Bn i i = 4 i = Pog i = i ; 3 g i i R —b od PoE = 3 i £ a i 8 ar 8 t Po = 4 i = Gi VEE coe pd = i i fee) = G4 Loss EY HEB i i ql 3 i £3 - 8 vod 5 Eb ay PEL i PA : i 4 : § SIE Poa i i = = i ook Nett 8 Toe jo 3 § Rd 2 ol HE Ed wow ¥ |= i & a 21 mi & End bow do 3 2 i i & 2B Eo = 81 Flow a. & ; i 2 EERE LOR To = Ed 8 i i Pg ob HE £12 Ho LS Sa 3 i i Ps wb boos 3 2 = Bi & =o £2 i 1 4 = > 3 i Sy 3 x i LEC i : oR 2% wi BEE SF ok o i © i y 3 3 b Bod 3 @ i § i i 3 Ia i 8 oF a 3 = Th wi + £# : & i PoE 8 3 Foam oby i § OR i i VR 2 PS om 8 gi 8 PS i i Pay Poa = {Bi Poo & + 3 at & Hd 3 @ i ' i 1 i 3 &oy aon =o 3 i 5 i v i i i 3 Go SE Zo 4 I i i i t Pog wo } 2 PR } i { i 3 3 oo 3 I) i i § 3 3 t 3 i a ¥ Pon ob i $ A i i PS i hi i E § i ned § 3 bod id i i i § I { t 3 3 i § 2 nn 3 § 3 § i 3 i i A . y i § i ve = i 1 3 i 3 ferent il 3 1 i i i y at § Sow 3 i 3 } Hannisiisidiidiiss } oo { i : i. Asa { & oF 3 i oioneaniiiiin : § IZ % oe i wo 3 = 8 i i o i 28 § 2 { ; 8 i £ § = 3 i = 5 ps o 3 a : a : 2 } 3 _— { : 2 8 i = { ‘ oie } i EAE J § ee prey 3 i 5 OK 4 $a i Ee) 4 kina =f y + T= i AAA -t 3 iv %3 i era " y + Ee He eeeeeeeaen 3 i SA hemmed

(2-2) Experimental results

Clearly from Table 1, since expansion drying was performed without providing the cutter device in Comparative Example 1, the discharged string-shaped crumb during expansion drying twined around the kicker of the belt conveyor in the subsequent stage of the duct. As a result, the crumb could not be transferred, and it was necessary {o stop processing. Moreover, since the siring-shaped crumb was aggregated, the volatile components (mainly water) remaining in the rubbery polymer could not be evaporated, that the water content {residual volatile content) in the product increased, and did not meet the standard {1% or less by weight) in some cases.

[0046]

In Comparative Example 2 in which expansion drying was performed using the dryer provided with the blade part including twenty non-plated cutter blades, a part of the string-shaped crumb was cut into granules by the cutter device, the water content in the resultant product was decreased as compared with Comparative Example 1, and the conveying operation was not hindered.

In Comparative Example 2, however, the string-shaped crumb twined around the cutter blades, a space around the extrusion part in the extrusion dryer was clogged, and it was necessary to stop processing. The cutter blades will break due to an increase in contact frequency with the discharged crumb if the rotational speed of the blade part of the dryer of Comparative Example 2 is increased to 600 to 1,000 rpm, and metal foreign matter will be mixed into the product. (0047)

On the other hand, in Example 1 in which expansion drying was performed using the dryer provided with the blade part including four plated cutter blades described in (1), the discharged string-shaped crimnb could be sufficiently cut into a crumb having a dimension of about 1 fo 10 cm using the cutter device. Therefore, a smooth drying process could be implernented without causing a problem in which the string-shaped crumb twine around the cutier blade, or the conveying operation is

Eb?

hindered. Since the discharged crumb was not aggregated, and could be supplied to the conveyer while maintaining a high specific surface ares, the drying process subsequent to expansion drying could be efficiently performed, and the water content in the resultant product could be reduced to 0.5% or less by weight.

[0048]

In Example 2 in which expansion drying was performed using the dryer provided with the blade part including twenty plated cutter blades, when the rotational speed of the blade part was 100 to 250 rpm (low-speed operation), a part of the siring-shaped crumb was cut into granules by the cutter device, the water content in the resultant product was decreased as cornpared with Comparative Example 1, and the conveying operation was not hindered, Moreover, since the cutter blades were plated, the string-shaped crumb could be cut into granules without causing breakage of the cuiter blades even when the rotational speed of the blade part was 250 to 800 rpm (high-speed operation}.

Note that the siring~-shaped crumb twined around the cutter blades to some extent when the rotational speed of the blade part was 100 to 250 rpm (low-speed operation). Therefore, a space around the extrusion part in the extrusion dryer may be clogged and the processing may be stopped depending on the processing amount and the like. When the rotational speed of the blade part is 250 to 800 rpm (high-speed operation), the discharged crumb from the extrusion part may clog the blade part due to an increase in contact frequency between the cuter blades and the discharged crumb depending on the processing amount and the like.

[0049]

In Example 3 in which expansion drying was performed using the dryer provided with the blade part including four non-plated cutter blades, the string-shaped crumb could be sufficiently cut into a crumb having a dimension of about 1 to 10 cm in the same manner as those in Example 1 without causing clogging due to the discharged rubber even when the blade part was rotated at a high speed. The drying process subsequent to expansion drying could be efficiently performed, and the water content in

Is the resultant product could be reduced 10 0.5% or less by weight in the same manner as those in Example 1.

The wear resistance of the blade part was low as compared with Example 1 since the cutter blades were not plated.

[0050]

It was thus confirmed that a rubbery polymer can be efficiently dried using the expansion-type dryer according to the present invention even if the crumb discharged from the extrusion part is in a string-shaped.

INDUSTRIAL APPLICATION

[0051

The extrusion drying apparatus of the present invention is suilably used for the production of a rubbery polymer having a wide range of properties.

HXPLANATION OF THE REFERENCE NUMBERS

[0052] tr extrusion dying apparatus, 21: cylinder, 221 screw, 3: hopper, 4: extrusion part, 41: die, 5; cutter device, 51: blade part, 511: center part, 312: cutter blade, 512: plated part, 52: rotary shaft, 6: duct

Claims

CLADMS

I. An expansion-type extrusion dryer for a rubbery polymer, characterized in that a cutter device for cutting an extruded rubbery polymer is disposed near an extrusion part through which a rubbery polymer is extruded, and that said cutter device comprises a blade part having a plated blade.
2. The expansion-type extrusion dryer for a rubbery polymer according to Claim 1, wherein the plating treatment of said plated blade is a hard chromium plating treatment or a nickel-phosphorus plating treatment,
3. The expansion-type extrusion dryer for a rubbery polymer according to Claim 1 or 2, wherein said extrusion part comprises a die, and wherein said blade part and said die are disposed at a clearance of 2 mm to 100 mm.
4. An expansion-type extrusion dryer for a rubbery polymer, characterized in that a cutter device for cutting an extruded rubbery polymer is disposed near an exirusion part through which a rubbery polymer is exiraded, and that said cutter device comprises a center part and a blade part having 2 to 10 blades radially extending from said center part,
5. The expansion-type exirusion dryer for a rubbery polymer according to Claim 4, wherein said blades are plated.
6. The expansion-type extrusion dryer for a rubbery polymer according to Claim 3, wherein the plating treatment of said plated blade is a hard chromium plating treatvoent or a nickel-phosphorus plating treatment.
7. The expansion-type extrusion dryer for a rubbery polymer according to any one of Claims 4 to 6, wherein said extrusion part comprises a die, and wherein said blade part and said die are disposed at a clearance of 2 mum to 100 mm.

&. A method for producing a rubbery polymer using said extrusion dryer according to any one of Claims 1 to 3, characterized by comprising an extrusion process in which said rubbery polymer is subjected to drying and extruding, and a cutting process in which an extruded rubbery polymer is subjected to cutting.

8, A method Tor producing & rubbery polymer using edd extrusion dryer soeniding to argv we of Clubs 4 to 7, charpetertved by comprising an extrusion process in which said rubbery polvioer is subisetad © dovioy and exuding, and wooutling possi in which an extracted rubbery pelvioer 13 subjected to cutting.