JP3373154B2 - Single-shaft continuous kneader - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a single-screw continuous kneader, and more specifically, the present invention relates to a thermosetting resin such as an epoxy resin composition containing a large amount of a hard inorganic filler. The present invention relates to a single-axis continuous kneader used for kneading a composition.

[0002]

2. Description of the Related Art Among thermosetting resin compositions, an epoxy resin composition containing 50 to 90% by weight of a hard inorganic filler such as silica in addition to organic materials such as epoxy resin and phenol resin is kneaded. When kneading with a machine to obtain a molding material, good dispersibility and homogeneity of the thermosetting resin composition are necessary conditions for obtaining a high-quality molding material. A number of proposals have been made for a continuous kneader for effectively kneading to obtain a high quality product.

For example, as proposed in JP-B-56-41301 and JP-B-51-22221, a continuous or intermittent spiral provided with a casing and a mixing blade arranged in the casing. A mixing and kneading device comprising a shaft and a device for rotating the spiral shaft in the casing and simultaneously reciprocating the casing, wherein the casing is disposed on an inner wall of the mixing device and protrudes radially inward. It is equipment equipped with teeth. Thus, a kneading machine has been proposed in which the material is sheared and kneaded at a distance between the blade and the tooth. However, this screw alone may cause insufficient melting of the organic substance of the thermosetting resin composition, an unstable kneading state, resulting in a decrease in discharge amount and a decrease in product quality.

[0004]

DISCLOSURE OF THE INVENTION The present invention is such that even if a thermosetting resin composition such as an epoxy resin composition containing a large amount of a hard inorganic filler is kneaded, the melting of an organic substance is insufficient or the kneaded state is insufficient. It was made for the purpose of providing a kneading machine of high quality and high productivity, which enables stable kneading without becoming unstable.

[0005]

As a result of intensive studies to solve the above problems, the present inventors have found that in the single-screw continuous kneader of the present invention, the spiral blade of the screw is continuous or a part thereof. In addition to the intermittent spiral shape that lacks the kneading, the kneading ability of the kneading machine is greatly improved by combining spacers that do not have spiral blades over one pitch of the screw or vertical blades that have an intermittent shape perpendicular to the screw axis. The present invention has been completed based on this finding. That is, the present invention comprises a continuous spiral blade part in which spiral blades are continuous, an interrupted spiral blade part lacking a part of the spiral blade, and a spacer part which does not have the spiral blade for one pitch or more of the screw, preferably spacer unit is provided in 1-5 locations of the screw, the spacer
-Total length of the part is 0.2 to 5 times the screw diameter
More preferably, the screw axial length is
-A uniaxial continuous kneader with a diameter of 4.5 to 17 times,
Further, the spiral blade is composed of a continuous spiral blade portion which is continuous, an interrupted spiral blade portion lacking a part of the spiral blade, and a vertical blade portion having vertical blades which are intermittently formed at right angles to the screw axis, and preferably a vertical blade. parts are provided in 1-5 locations of the screw, vertical
The total overall length of the straight section Oh at 0.2 to 5 times the diameter of the screw
More preferably, the screw axial length is
A single-axis continuous kneader having a diameter of 4.5 to 17 times .
Furthermore, a continuous spiral blade part in which spiral blades are continuous, an interrupted spiral blade part lacking a part of the spiral blade, and a spacer part not having the spiral blade for one pitch or more of the screw and a screw shaft interrupted at right angles The single-axis continuous kneader is characterized by having a screw including a vertical blade portion having a vertical blade of a general shape.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The kneading machine of the present invention is a thermosetting resin composition containing a hard inorganic filler such as silica or alumina, and particularly an epoxy resin composition for semiconductor encapsulation containing a large amount of hard inorganic filler. It can be suitably used for kneading materials and the like. Such an epoxy resin composition for semiconductor encapsulation includes, for example, cresol novolac type, phenol novolac type epoxy resins, phenol resins, aromatic amines, curing agents such as acid anhydrides, accelerating curing of imidazole compounds, etc. Examples of the composition include an agent, an inorganic filler such as silica and alumina, a flame retardant such as antimony trioxide and a brominated compound, a pigment, a release agent and the like.

In the kneading machine of the present invention, for example, as shown in FIG. 1, a supply part (A) for supplying a material is composed of a continuous spiral blade part 1 having a continuous spiral blade 11 in which spiral blades are continuous, Interrupted spiral blade part 2 having a plasticized part (B) for plasticizing a material, which has an interrupted spiral blade 12 lacking a part of the spiral blade.
And a kneading section (C) mainly for kneading materials
Is a spacer portion 3 having no spiral blade over one pitch of the screw, an interrupted spiral blade portion 2 having an interrupted spiral blade 12 lacking a part of the spiral blade, and an intermittent shape perpendicular to the screw axis. By having a screw consisting of a vertical wing 4 provided with wings 14 and an interrupted spiral wing 2 having an interrupted spiral wing 12 lacking a portion of the spiral wing,
The load electric power of the screw drive motor at the time of kneading the thermosetting resin composition containing the hard inorganic filler can be dramatically improved, and high quality and high productivity can be realized.

In the spacer portion 3 or the vertical blade 14 which is intermittently formed at a right angle to the screw axis, there is no or very small force for feeding the material fed from the rear in its own rotation and back-and-forth movement, so this portion is very small. The material stays in the. As a result, the material in the part of the interrupted spiral blade part 2 on the material supply side behind the spacer part 3 or the vertical blade 14 is prevented from passing between the interrupted spiral blade 12 and the interlocking teeth fixed to the casing, It becomes possible to pass effectively, and the shearing force is effectively applied between the rotating spirally moving intermittent spiral blade 12 and the interlocking teeth fixed to the casing. is there.

In the screw used in the present invention, B
There is no particular limitation on the form of the absence of the spiral blade of the interrupted spiral blade 12 used in the zone and the C zone. It is necessary for the spacer portion 3 to be free of blades having a pitch of 1 screw or more. The angle of the surface of the vertical blade 14 is preferably within 90 ° ± 45 ° with respect to the screw axis, and the size of the blade is smaller than that of the interrupted spiral blade, and the feed of the kneading material is smaller than that of the interrupted spiral blade. is necessary. It is preferable that the continuous spiral blade portion, the interrupted spiral blade portion, the spacer portion, and the vertical blade portion are divided into elements, if necessary, from the viewpoint of ease of manufacturing the screw and kneading efficiency of the resin composition.

FIG. 3 (a) is a partial side view showing the interrupted spiral blade portion 2 having the interrupted spiral blades 12 constituting the screw of the kneading machine of the present invention, and FIG. 3 (b) is a sectional view. . FIG. 4 (a) is a partial side view showing the spacer portion 3 constituting the screw of the kneading machine of the present invention, and FIG. 4 (b) is
FIG. FIG. 5A is a partial side view showing the vertical blade portion 4 having the vertical blades 14 having blades intermittently formed at right angles to the screw axis of the screw of the kneading machine of the present invention. (B) is sectional drawing.

In the kneading machine of the present invention, the axial length of the screw is 4.5 to 17 D with respect to the screw diameter D.
And more preferably in the range of 6 to 14.5D. If the length of the screw in the axial direction is less than 4.5D, it may be difficult to feed the supplied material, or the material may be melted or kneaded insufficiently to deteriorate the quality. Conversely, 17
If it is larger than D, the feeding of the material becomes strong and the kneading becomes insufficient, or conversely, excessive heating may result in failing to obtain a high-quality product.

The total axial length of the spacers or vertical wings is in the range of 0.2-5D, more preferably 0.3.
If it is set within the range of up to 2.5 D and is installed separately at 1 to 5 places, the materials can be kneaded at a level where the load power value of the shaft drive motor is high. If the total length of the spacer part or vertical wing part is less than 0.2D, there is no effect of installation, and conversely 5
If it is larger than D, overheating may occur.

In the kneading machine of the present invention, the screw may be formed in an integral shape, or the screw blade may be divided into elements each having a pitch of a spiral blade or divided into appropriate lengths, and a plurality of elements may be inserted into the shaft body. A screw can be formed. The kneader of the present invention can be used as a single screw continuous kneader having one screw.

[0014]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Example 1 The screw diameter was 46 mm, L / D = 11, the length of the supply part (A) was 150 mm, the length of the plasticizing part (B) was 150 mm, and the length of the kneading part (C) was 206 mm. Single-shaft continuous kneading with a screw having the structure shown in FIG. 2, which has a 27 mm long spacer part in a part of the plasticizing part and a 27 mm long spacer part in a part of the kneading part at a total of two places Machine was used. 100 parts by weight of cresol novolac type epoxy resin, 55 parts by weight of phenol novolac resin, 2 parts by weight of 2-methylimidazole, 1 part by weight of montan wax, 1 part by weight of carbon black and 400 parts by weight of silica are mixed using a Henschel mixer, Raw materials for the epoxy resin composition were prepared. In the above kneader, the barrel temperature was adjusted to 20 ° C. in the material supply section,
℃, 90 ℃ of the tip of the kneading machine, screw speed 2
The epoxy resin composition raw material was kneaded and extruded at 00 rpm. The discharge rate was 40 kg / hr. The value obtained by subtracting the load power at the same rotation speed without passing the raw material from the load power of the screw driving motor of the kneader at the time of kneading divided by the discharge amount per hour is 0.060 kW / kg
It was / hr.

Example 2 With a screw diameter of 46 mm and L / D = 11, the feeding section (A)
Has a length of 150 mm and the plasticized part (B) has a length of 150 m
m, the kneading section (C) has a length of 206 mm, and the plasticizing section has a spacer section having a length of 27 mm and a part of the kneading section has a shape intermittently perpendicular to the screw shaft having a length of 27 mm. A single-axis continuous kneader having a screw having a structure shown in FIG. 1 having one vertical blade portion provided with vertical blades was used. Cresol novolac type epoxy resin 1
00 parts by weight, 55 parts by weight of phenol novolac resin, 2
-Methylimidazole 2 parts by weight, montan wax 1 part by weight, carbon black 1 part by weight and silica 400 parts by weight were mixed using a Henschel mixer to prepare an epoxy resin composition raw material. With the above kneader, the barrel temperature was set to 20 ° C. for the material supply section, 20 ° C. for the middle section of the kneader, and 90 ° C. for the tip of the kneader, and the epoxy resin composition raw material was kneaded and extruded at a screw rotation speed of 200 rpm. The discharge rate was 40 kg / hr. The value obtained by subtracting the load power at the same rotation speed without passing the raw material from the load power of the screw driving motor of the kneading machine at the time of kneading divided by the discharge rate per hour is 0.066 kW / kg / hr. there were.

Comparative Example 1 As in Example 1, the screw diameter was 46 mm, L / D = 11, and the length of the supply section (A) was 1.
A single-screw continuous kneading machine having a screw of 50 mm, a plasticizing part (B) length of 150 mm, a kneading part (C) length of 206 mm, and both of the plasticizing part and the kneading part having only intermittent spiral blades is used. Using. The same epoxy resin composition raw material as in Example 1 was kneaded and extruded. The barrel temperature was set to 20 ° C. for the material supply section, 20 ° C. for the middle section of the kneader, and 90 ° C. for the tip section of the kneader.
However, since the unmelted raw material spouted from the discharge port at the tip, the operation was changed to 100 rpm. The discharge rate was initially 40 kg / hr, but since the unmelted raw material came out of the discharge port, it was changed to 25 kg / hr. The value of load amount / discharge amount of the screw drive motor after changing to the above stable operating conditions is 0.025K when calculated by the same calculation method as in the embodiment.
It was W / kg / hr. As for the quality such as moldability, Example 1
Decreased compared to.

[0017]

According to the kneading machine of the present invention, a thermosetting resin composition containing a large amount of a hard inorganic filler can be kneaded stably with high quality and high productivity.

[Brief description of drawings]

FIG. 1 is a side view of one embodiment of a screw used in the present invention.

FIG. 2 is a side view of another embodiment of the screw used in the present invention.

FIG. 3 is a partial side view and a cross-sectional view showing an interrupted spiral blade portion having an interrupted spiral blade that constitutes a screw of the kneading machine of the present invention.

4A and 4B are a partial side view and a cross-sectional view showing a spacer portion having no blade with a pitch of 1 pitch or more, which constitutes a screw of the kneading machine of the present invention.

5A and 5B are a partial side view and a cross-sectional view showing a vertical blade portion having vertical blades that are intermittently formed at right angles to the screw shaft that constitutes the screw of the kneading machine of the present invention.

[Explanation of symbols]

1 Continuous spiral wings 2 Intermittent spiral wings 3 Spacer part 4 Vertical wings 11 continuous spiral wings 12 Intermittent spiral wings 14 vertical wings

Continuation of front page (56) Reference JP 2000-94486 (JP, A) JP 63-251220 (JP, A) JP 59-194825 (JP, A) JP 49-39153 (JP, A) JP 10-235713 (JP, A) JP 9-85739 (JP, A) JP 8-336886 (JP, A) JP 5-168884 (JP, A) Actual development Sho 60 -94922 (JP, U) Actual opening 55-138518 (JP, U) Actual opening 5-16230 (JP, U) Actual opening 1-67019 (JP, U) JP-B 51-22221 (JP, B1) ) Actual Publication Sho 49-11083 (JP, Y1) Special Table Sho 56-500084 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B29B ^7/ 00-17/02

Claims (3)

(57) [Claims] 1. A continuous spiral blade section having a continuous spiral blade having continuous spiral blades, an interrupted spiral blade section having an interrupted spiral blade lacking a part of the spiral blade, and a spiral blade extending over one pitch of a screw or more. A single-screw continuous kneading machine, characterized by having a screw consisting of a vertical blade portion which is provided with intermittent vertical blades perpendicular to the spacer portion and / or the screw axis. 2. The spacer portion or the vertical blade portion is provided at 1 to 5 places of the screw, and the spacer portion or the vertical blade portion is provided.
The single-screw continuous kneading machine according to claim 1, wherein the total total length of each is 0.2 to 5 times the screw diameter. 3. The single-shaft continuous kneading machine according to claim 1, wherein the axial length of the screw is 4.5 to 17 times the screw diameter.