JP2005262453A - Viscous material kneading method and kneader therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a viscous material kneading method for uniformly dispersing a viscous materials different in viscosity such as a rubber, a thermosetting resin or the like under a solventless condition while shortening a kneading time to enhance productivity, and a kneader therefor. <P>SOLUTION: In the viscous material kneading method for kneading viscous materials 102 and 103 different in viscosity, the viscous materials 102 and 103 are frozen and embrittled and subsequently ground into a powdery form to be mixed with each other. The obtained mixture (n) is continuously and quantitatively supplied to the bank 260 between kneading rolls 211 and 212 and kneaded while wound around one kneading roll 211 while performing convection/substitution by the grooves 215. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method and an apparatus for kneading a viscous material having a viscosity difference such as rubber and a thermosetting resin. More specifically, the present invention improves the productivity by uniformly dispersing while reducing the kneading time in the absence of a solvent. The present invention relates to a viscous material kneading method and apparatus.

  In order to impart toughness to a thermosetting resin, a technique is known in which a solid rubber component is dispersed in a thermosetting resin matrix (see, for example, Patent Documents 1 and 2).

  The thermosetting resin composition in which such a solid rubber component is dispersed is a low-melting-point thermosetting that is compatible with the solid rubber by kneading in advance because the solid rubber is uniformly dispersed in the resin matrix in the absence of a solvent. A pre-kneaded material in which a solid rubber component is dispersed in a thermosetting resin is prepared by kneading the curable resin, and the pre-kneaded material is kneaded with the matrix resin.

In the step of obtaining the pre-kneaded product, since there is a difference in viscosity between the rubber and the thermosetting resin, in order to disperse the solid rubber component in the thermosetting resin so that the rubber particles do not remain, kneading and cooling are performed. The process had to be repeated many times, and there was a problem that the kneading time took and productivity was poor.
JP-A-5-239317 JP-A-8-209003

  An object of the present invention is to provide a viscous material kneading method capable of uniformly dispersing viscous materials having a viscosity difference, such as rubber and thermosetting resin, while reducing the kneading time in the absence of a solvent, thereby improving productivity. And providing an apparatus.

The kneading method of the viscous material of the present invention that achieves the above object is a kneading method of a viscous material for kneading viscous materials having different viscosities,
In the step of kneading the viscous material after freeze embrittlement and then pulverizing and mixing the mixture, and kneading the resulting mixture, two rotatable kneading rolls formed with grooves extending spirally on the surface Using the kneading means that kneads the mixture while being fed from one side to the other side in the roll axis direction while winding the mixture around one kneading roll and performing convection and substitution of the mixture by the groove. Is continuously fed to the banks between the kneading rolls of the kneading means and kneaded.

  The viscous material kneading apparatus of the present invention is a viscous material kneading apparatus for kneading viscous materials having different viscosities, and mixing means for mixing viscous materials having different viscosity differences, and kneading the mixture obtained by the mixing means Rotating with a kneading means that has a pulverizing section that freezes and embrittles the viscous material with a refrigerant and pulverizes it into a powder, and the kneading means forms a groove extending spirally on the surface. Two possible kneading rolls are arranged side by side, and the mixture is wound around one kneading roll, and the mixture is convected and replaced by the groove, and kneaded while being fed from one side to the other side in the roll axial direction. It has a kneader.

  According to the present invention described above, it is possible to uniformly disperse the solid rubber component in the resin without using a long kneading time as in the prior art in the absence of a solvent. Therefore, a viscous material having a viscosity difference can be uniformly dispersed while shortening the kneading time in the absence of a solvent, and productivity can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows an example of a kneading apparatus for viscous materials according to the present invention. This kneading apparatus mixes a plurality of viscous materials having different viscosities and kneading means for kneading a mixture n obtained by the mixing means 1. 2 are provided. Here, solid rubber is described as an example of a viscous material having a high viscosity, and a solid thermosetting resin having a low melting point is used as a viscous material having a low viscosity. However, the present invention is not limited thereto.

  The mixing means 1 freezes the rubber cutting part 100 which cuts the solid rubber lump 101 into the rubber pieces 102, the rubber pieces 102 and the pellet-like solid thermosetting resin pieces 103 with liquid nitrogen and pulverizes them into powder. A crushing unit 120 is provided.

  As shown in FIG. 1, the rubber cutting unit 100 includes a roller conveyor 104 that conveys the solid rubber lump 101, and a cutting means 105 for the solid rubber lump 101 installed above the roller conveyor 104. The roller conveyor 104 includes rollers 107 arranged on a support frame 106. The cutting means 105 includes a cutting blade 110 fixed to the lower end of the rod 109 of the hydraulic cylinder 108. By actuating the hydraulic cylinder 108, the rod 109 is moved up and down, so that the cutting blade 110 can be raised and lowered.

  The solid rubber lump 101 conveyed intermittently on the roller 107 is cut into a rubber middle piece 102 ′ by a cutting blade 110 that descends, and this rubber middle piece 102 ′ is returned to the input side of the roller conveyor 104 by the return belt conveyor 111. The rubber middle piece 102 ′ is again cut on the roller 107 by the cutting blade 110, and this process is repeated to obtain a rubber piece 102 having a desired size.

  The pulverizing unit 120 includes a first pulverizing unit 122 that pulverizes a rubber piece 102 frozen by liquid nitrogen supplied from a liquid nitrogen supply source 121 into powder, a crushed rubber piece (rubber powder) 123, and a beret-like solid. A second crushing means 125 is provided for crushing and mixing the thermosetting resin pieces 103 into powder while being frozen with liquid nitrogen. The solid thermosetting resin piece 103 used here is a solid thermosetting resin material such as a low melting point epoxy resin that can be compatible with kneading with rubber.

  A predetermined amount of the rubber piece 102 in the container 127 measured by the platform scale 126 is frozen with liquid nitrogen supplied from the liquid nitrogen supply source 121 and then supplied to the first crushing means 122. Liquid nitrogen is supplied from the liquid nitrogen supply source 121 to each of the pulverizing means 122 and 125 so that the pulverized product can be maintained in a frozen state without being melted by shearing heat generated during the pulverization.

  The first pulverizing means 122 and the second pulverizing means 125 have the same structure, and FIGS. 2 to 4 show examples of preferable pulverizing means used for the pulverizing means 122 and 125 in detail.

  This crushing means is constituted by a hammer mill device, and a hammer crushing portion 131 for crushing with a hammer on a support frame 130 and a motor 132 for operating the hammer crushing portion 131 are installed. As shown in FIG. 4, the hammer crushing part 131 has a body 135 having a hollow part 134 for accommodating the hammer 133 inside. A shaft 137 that is rotatably supported through a bearing 136 is inserted into the body 135.

  A disc body 139 is fixed to the shaft 137 with a cylindrical collar 138 interposed at predetermined intervals along the axial direction. Each disk body 139 is formed with a plurality of through holes 140 at predetermined intervals in the circumferential direction, and hammer bolts 141 for fixing the hammer 133 are inserted into the corresponding through holes 140 of each disk body 139. The hammer bolt 141 is fixed to the disc body 139 by nuts 242 screwed to both ends thereof. The hammer 133 is fixed to the hammer bolt 141 at a position between the disk bodies 139 and is rotated by the rotation of the shaft 137 to pulverize the object to be crushed in the cavity 134.

  A screen 143 is provided below the cavity 134 so that only the powder crushed to a predetermined size by the hammer 133 is dropped downward. In the figure, reference numeral 144 denotes a belt for transmitting the rotation of the motor 132 to the shaft 137, and reference numeral 145 denotes a handle for fastening an opening / closing lid when the screen 143 is attached / detached.

  At the upper part of the hammer pulverization part 131, a popper 146 is provided for throwing an object to be crushed into the cavity part 134. The lid is opened by lowering the handle 147 in the direction of the arrow so that the object to be crushed can be supplied into the popper 146. A nitrogen supply port 148 for supplying liquid nitrogen is provided below the hopper 146 so that the liquid nitrogen supplied from the liquid nitrogen supply source 121 can be supplied into the hopper 146 and the cavity 134 from the nitrogen supply port 148. .

  By supplying liquid nitrogen, softening and sticking caused by heat generated during pulverization in the hammer pulverization unit 131 is prevented, and further, when used as the second pulverization means 125, the rubber powder 123 is prevented from being condensed again in the hopper 146. To do. Further, the solid thermosetting resin piece 103 supplied to the hopper 146 of the second pulverizing means 125 is frozen.

  A lower end of the body 135 is opened, and a collection tank 151 is detachably attached to a lower end of the discharge duct 150 connected to the opening 149.

  The kneading means 2 includes a kneader 200 for kneading the mixture n obtained by the mixing means 1, and a quantitative feeder 201 capable of continuously feeding the mixture n to the kneader 200 in a constant amount.

  The quantitative feeder 201 includes a hopper 202 and a single-screw extruding portion 203 connected to the lower end of the hopper 202. The weight of the hopper 202 is constantly measured by a load cell (not shown), and weight control based on the weight (lost in weight) is performed. The mixture n supplied into the hopper 202 is continuously and quantitatively supplied from the single-screw extruder 203 to the kneader 200. Instead of the single screw extrusion unit 203, a twin screw extrusion unit may be used.

  As shown in FIGS. 5 to 9, the kneader 200 has two rotatable kneading rolls 211 and 212 that are arranged side by side between the left and right supports 209 and 210. The kneading rolls 211 and 212 can be rotated via a speed reducer 214 by a speed-controllable inverter motor 213 disposed in the supports 209 and 210, respectively, and the rotation speed of the front kneading roll 211 is set to the rear side. By controlling it faster than the rotational speed of the kneading roll 212, the mixture n supplied to the bank 260 (see FIG. 9) between the kneading rolls 211 and 212 is kneaded while being wound only around the front kneading roll 211. ing. High compression and high shear are given to the mixture n between the two kneading rolls 211 and 212.

  As shown in FIG. 7, a plurality of grooves 215 extending in a spiral shape are formed on the surfaces 211a and 212a of the kneading portions 211A and 212A of the kneading rolls 211 and 212. The grooves 215 have the same groove width, and the helical interval gradually decreases in the roll axis direction from one side (left supply side) to the other side (right discharge side). As shown in FIG. 9, the mixture n is kneaded while performing convection and substitution, and continuously kneaded while being sent from one side to the other side in the roll axis direction, as shown in FIG. 9. .

  As shown in FIG. 8, the kneading roll 211 has a sealed internal cavity 217, and the internal cavity 217 is water-tightly divided left and right in the roll axis direction, and a left cavity 218 and a right cavity 219. It is composed of In the internal cavity 217, a pipe 220 having a double tube structure at both ends is extended on the center of the roll axis, and ends 220a protruding from both ends of the kneading roll are connected to the rotary joint 221.

  A fluid such as water whose temperature is adjusted is supplied from the supply port 222 provided in the left rotary joint 221 through the inner passage a of the pipe 220 into the left cavity 218, and the fluid circulated in the left cavity 218 is the pipe. 220 is discharged from a discharge port 223 provided in the left rotary joint 221 through an outer passage b 220.

  Also in the right cavity 219, a fluid such as water whose temperature is adjusted is supplied from the supply port 224 provided in the right rotary joint 221 through the inner passage a ′ of the double pipe 220 and passes through the outer passage b ′. Thus, the medium is discharged to the outside through a discharge port 225 provided in the right rotary joint 221 so that medium warm water or the like can circulate in the right cavity 219.

  A fluid circuit (not shown) is connected to the supply ports 222 and 224 and the discharge ports 223 and 225. Although not shown, the kneading roll 212 has the same configuration, so that the temperature of the two kneading rolls 211 and 212 can be controlled respectively, and the temperature can also be controlled at the left and right portions of the kneading rolls 211 and 212 in the axial direction. The temperature can be controlled in 4 sections.

  On the upper side of the kneading rolls 211 and 212, weiring means 230 for preventing the mixture n (the mixture supplied to the bank 260 and the mixture contained in the kneading) from leaking in the axial direction of the kneading rolls 211 and 212. Is provided. In this damming means 230, two guide rods 232 are disposed at a predetermined interval between support members 231 erected on the upper surfaces of the left and right supports 209, 210, and one side of the two guide rods 232 is disposed. A sliding block body 233 is slidably attached along the guide rod 232. A fixed block body 234 is fixed to the guide rod 232 on the other side of the guide rod 232.

  Two support bars 236 extending vertically are attached to the sliding block body 233 and the fixed block body 234, respectively, with their lower ends connected by a connecting bar 235. A damming member 237 for preventing the mixture n from leaking outside the kneading portions 211A and 212A is detachably fixed to the connecting bar 235 with screws (not shown). As shown in FIG. 6, the damming member 237 has an inverted triangular shape having arcuate surfaces 237a and 237b on the lower side corresponding to the surfaces 211a and 212a of the kneading portions 211A and 212A of the adjacent kneading rolls 211 and 212, respectively. Is formed. The surfaces 237a and 237b face the surfaces 211a and 212a of the kneading portions 211A and 212A through a slight gap.

  The support bar 236 attached to the fixed block body 234 is disposed on the fixed block body 234 via a hinge mechanism (not shown), and the lever 238 attached to the fixed block body 234 is lowered downward as indicated by an arrow x. The support bar 236 pivots as indicated by an arrow y so that the dam member 237 can be separated from the dam position shown in the figure, thereby facilitating cleaning of the kneading rolls 211 and 212.

  A fluid pressure cylinder 239 is installed on the left support 209 via a bracket 241, and the tip of the rod 240 of the fluid pressure cylinder 239 is connected to the sliding block body 233. Due to the expansion and contraction of the rod 240, the sliding block body 233 moves to the left and right along the guide rod 232, whereby the supply side (left side) weir member 237 causes the surfaces 237a and 237b to become the surfaces 211a and 237 of the kneading rolls 211 and 212, respectively. It is possible to move left and right while approaching 212a.

  As shown in FIG. 1, the mixture n is supplied to the kneading machine 200 from the left side of the kneading rolls 211 and 212. When the supply of the mixture n is completed, the fluid pressure cylinder 239 extends the rod 240 to perform the kneading. The mixture n kneaded by the rolls 211 and 212 is sent to the right side while being pushed by the weir member 237 moving to the right side.

  The right end of the kneading part 211A of the kneading roll 211 on the front side around which the mixture n to be kneaded is a discharge part 242, and the mixture n (kneaded material) after kneading is removed from the kneading roll 211 by the discharge part 242. Wide cutter 243 is disposed. The cutter 243 is fixed to a support member 244 provided between the left and right supports 209 and 210, and the blade part 245 at the tip is in contact with the surface 211a of the kneading part 211A. The kneaded material is peeled off from the surface 211a by the blade portion 245, and is recovered in a recovery tank 246 disposed below it.

  Hereinafter, the method for kneading the viscous material of the present invention will be described using the above-described kneading apparatus.

  First, the rubber cutting unit 100 of the mixing unit 1 cuts the solid rubber lump 101 into block-shaped rubber pieces 102 having a thickness of about 30 mm and a length of about 30 mm, for example, and a predetermined amount of the cut rubber pieces 102 are supplied with liquid nitrogen. After being frozen and embrittled by the liquid nitrogen supplied from the source 121, it is supplied to the hopper 146 of the first crushing means 122.

  The frozen and embrittled rubber piece 102 is pulverized into a powder of 1 mm or less, preferably 50 to 500 μm, by a hammer 133 rotated by a hammer crushing unit 131 while being cooled by liquid nitrogen supplied from a nitrogen supply port 148. Is done. The crushed rubber powder 123 falls through the screen 143 and is collected in the collection tank 151.

  Next, the recovered rubber powder 123 and pellet-shaped solid thermosetting resin pieces 103 are supplied to the hopper 146 of the second pulverizing means 125. The solid thermosetting resin piece 103 is frozen by the liquid nitrogen supplied to the hopper 146, and is pulverized into a powder by a hammer 133 rotating in a hammer pulverizing unit 131 together with the frozen rubber powder 123, and is thermosetting into rubber powder. The mixture n in a mixed state (dry blend state) coated with resin powder (resin powder dispersed) is recovered in the recovery tank 151 of the second pulverizing means 125. The diameter of the thermosetting resin powder pulverized at this time is preferably 20 to 100 μm.

  The collected mixture n is supplied to the quantitative feeder 201 of the kneading means 2. It is continuously supplied from the metering feeder 201 to the bank 260 between the kneading rolls 211 and 212 adjacent to the left side blocking member 237 of the kneading machine 200. The mixture n that is wound around the front kneading roll 211 having a high rotational speed and convection / replacement by the groove 215 while being subjected to the compression shearing action is sent while being sequentially kneaded to the other side.

  During kneading, warm water is supplied into the cavity 217 of the front kneading roll 211 around which the mixture n to be kneaded is wound, and heat is applied from the kneading roll 211 to the mixture n to be kneaded, while the cavity of the rear kneading roll 212 is provided. Cooling water is supplied into the section 217, and kneading is performed while cooling with the kneading roll 212.

  For example, in the case of a mixture n of 100 parts by weight of a solid acrylonitrile bradiene rubber and 500 parts by weight of a solid epoxy resin having a melting point of 40 ° C., hot water of about 35 ° C. slightly lower than the melting point is supplied to the kneading roll 211 on the front side, Cooling water of about 15 ° C. is supplied to the kneading roll 212 on the rear side. This makes it easy for the highly adhesive solid epoxy resin to be wound around the kneading roll 211 on the front side due to the rear roll temperature and the shear heat generation between the rolls.

  When the kneaded mixture n reaches the discharge portion 242, the kneaded material is peeled off from the surface 211a by the blade portion 245 of the cutter 243, and dropped into the collection tank 246 disposed below it and collected.

  When the supply of a predetermined amount from the metering feeder 201 to the bank 260 between the kneading rolls 211 and 212 is completed, the fluid pressure cylinder 239 of the damming means 230 is activated. The rod 240 is extended in accordance with the feed speed of the mixture n to be kneaded, and the mixture n kneaded by the left weir member 237 that moves with the rod 240 is moved to the discharge unit 242 to the right while pushing the mixture n. To recover.

  According to the present invention described above, in the step of kneading the obtained mixture n after freezing the solid rubber material and the solid thermosetting resin material, which are viscous materials having different viscosities, and then pulverizing and mixing them into powder. While the mixture n is wound around one kneading roll 211, the mixture n is continuously supplied to the bank 260 between the kneading rolls 211 and 212 while being convected and replaced by the groove 215. It is possible to uniformly disperse the solid rubber component in the resin without taking a long kneading time as in the prior art under a solvent. Therefore, a viscous material having a viscosity difference can be uniformly dispersed while reducing the kneading time in the absence of a solvent, and productivity can be improved.

  In the above embodiment, liquid nitrogen is used for freezing the viscous material, but any refrigerant may be used as long as it can be frozen.

  Moreover, in the said embodiment, the rubber | gum piece 102 frozen and embrittled by the 1st grinding | pulverization means 122 is grind | pulverized to the rubber powder 123, and the pellet-shaped solid thermosetting resin piece 103 is grind | pulverized by the 2nd grinding | pulverization means 125 to powdery form. While the rubber powder 123 is mixed, the rubber pieces 102 frozen and embrittled by the first pulverizing means 122 are pulverized into the rubber powder 123, while the second pulverizing means 125 pellets the solid thermosetting resin small pieces. 103 may be pulverized into powder and mixed with another mixing device to obtain a mixture n obtained by coating rubber powder with thermosetting resin powder. The particle sizes of the rubber powder 123 and the thermosetting resin powder at that time are preferably 50 to 500 μm and 20 to 100 μm, respectively, in the same manner as described above.

It is front explanatory drawing which shows an example of the kneading apparatus of the viscous material of this invention. It is a front view which shows an example of a grinding | pulverization means. FIG. 3 is a side view of FIG. 2. It is a half section side view showing an example of a hammer crushing part. It is a front view which shows an example of a kneading machine. It is a PP arrow line view of FIG. It is an enlarged plan view of a kneading roll. It is a partial cross section front view of a kneading roll. It is sectional explanatory drawing which shows the effect | action by a kneading roll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Kneading means 2 Kneading means 100 Rubber cutting part 101 Solid rubber lump 102 Rubber piece (viscous material) 103 Solid thermosetting resin piece (viscous material)
DESCRIPTION OF SYMBOLS 120 Crushing part 121 Liquid nitrogen supply source 122 1st grinding | pulverization means 125 2nd grinding | pulverization means 131 Hammer crushing part 200 Kneading machine 211,212 Kneading roll 215 Groove 260 Bank n Mixture

Claims (10)

A method for kneading viscous materials having different viscosities,
After the freezing embrittlement of the viscous material, pulverized into a powder and mixed,
In the step of kneading the obtained mixture, two rotatable kneading rolls formed with grooves extending spirally on the surface are juxtaposed, the mixture is wound around one kneading roll, and the grooves Using kneading means to knead while feeding from one side to the other side in the roll axis direction while performing convection and substitution of the mixture,
A method for kneading a viscous material, wherein the mixture is continuously supplied in a constant amount to a bank between kneading rolls of the kneading means and kneaded.   The method for kneading a viscous material according to claim 1, wherein the viscous material is a solid, and the solid viscous material that has been fragmented is freeze embrittled with a refrigerant and then pulverized.   The method for kneading a viscous material according to claim 2, wherein, after the viscous material having a higher viscosity among the viscous materials is freeze-ground, the pulverized material and the viscous material having a lower viscosity are frozen and ground together.   The method for kneading a viscous material according to claim 1, 2 or 3, wherein the mixture is kneaded while applying heat from the one kneading roll and cooling with the other kneading roll.   The method for kneading a viscous material according to claim 1, 2, 3, or 4, wherein the viscous material is a solid rubber and a solid thermosetting resin. A viscous material kneading apparatus for kneading viscous materials having different viscosities, comprising a mixing means for mixing viscous materials having different viscosity differences, and a kneading means for kneading the mixture obtained by the mixing means,
The mixing means has a pulverizing part that freezes and embrittles the viscous material with a refrigerant and pulverizes it into a powder;
The kneading means has two rotatable kneading rolls formed with grooves extending in a spiral shape on the surface, and the mixture is wound around one kneading roll, and the mixture is convected and replaced by the grooves. An apparatus for kneading a viscous material having a kneader that performs kneading while feeding from one side to the other side in the roll axis direction.   The viscous material kneading apparatus according to claim 6, wherein the viscous material is solid, and the pulverizing unit pulverizes the small solid viscous material frozen and embrittled by the refrigerant.   The pulverizing unit pulverizes the higher viscosity material frozen by the refrigerant into powder, and the lower viscosity material frozen by the refrigerant and the pulverized product into powder. The viscous material kneading apparatus according to claim 7, further comprising a second pulverizing unit.   9. The apparatus for kneading a viscous material according to claim 6, 7 or 8, wherein the temperature of the two kneading rolls can be controlled in four sections. The viscous material kneading apparatus according to claim 6, 7, 8, or 9, wherein the viscous materials having different viscosity differences are solid rubber and solid thermosetting resin.

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