JPH0442094Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is used in the production of foam molded products to mix and stir reactive ingredients such as hard urethane foam or phenolic resin foam in a mixing and agitation unit set in a housing. A delivery pump that directly suctions and sends out the mixed liquid with increased viscosity mixed in the process is connected to the discharge port to suppress the increase in pressure and deliver the reactive mixed liquid to the molding section in the shortest possible time. This invention relates to a device for delivering a high-viscosity stirred mixture of thermosetting resin.

[Conventional technology]

Conventionally, this system of mixing devices for reactive components has been equipped with a number of protruding blades on the rotating shaft to stir and mix, and all of these systems have been used for mixing only, and have been able to mix sufficiently. For example, Tokuko No. 32-6376, Tokuko No. 34-
6732, JP-A No. 48-63361, etc.,
In addition, high viscosity materials that are considered difficult to mix sufficiently include, for example, Utility Model Publication No. 49-15928,
Some are described in publications such as Japanese Patent Publication No. 50-23875.
In addition, although it is not suitable for mixing high viscosity ingredients, there are systems that mix by a spiral mixing path using natural falling without using power, for example,
There is one described in Publication No. 7235.

In the case of the above-mentioned mixing and stirring system, if the viscosity of the mixed liquid is relatively low, there will be little pressure change inside the stirring device, so there will be no problem in operation, but in the case of hard urethane foam or phenolic resin foam, The starting material is usually about 2000 cp (25°C), but the viscosity increases by adding various ingredients such as necessary compounding ingredients, neutralizers, flame retardants, fillers, and other additives. When the viscosity becomes particularly high, the internal pressure inside the stirring device increases rapidly, resulting in a high viscosity and high pressure state being discharged, making it difficult to send out the mixed liquid and injecting it into the molding device installed at the discharge port. This causes troubles such as falling of the hose and other problems such as unsmooth discharge, which causes problems in the work process, such as stopping production or damaging the agitation device.

[Problems to be solved by the invention] In the above-mentioned conventional mixing and stirring system equipment, when making boards or panels of hard urethane foam or phenolic resin foam using a high viscosity liquid mixture, if the viscosity is high, The discharge pressure increases, and if a long hose and injection pipe are connected to the discharge port in order to distribute the discharged high-pressure mixed liquid to the molding section, the pressure will further increase. Problems when this discharge pressure is high include a drop in rotor rotation speed, poor stirring of the mixed liquid, mixed resin flowing back from the rotating shaft, solidification of the stirring head, rupture or falling off of the hose, and failure of the hose. The adhesion of a highly viscous mixture to the internal wall reduces the required flow rate, and in the case of a multi-component blend system, fluctuations in the flow rate ratio occur due to fluctuations in supply pressure.

Therefore, it is necessary to reduce the discharge pressure of the above-mentioned problem, to achieve sufficient mixing in a short time and to discharge at a constant transfer speed, and a distribution pipe for distributing the discharged mixed liquid discharged from the discharge port to the molding section. In order to prevent further increase in pressure due to the settings of , it is necessary to more actively suck and discharge the fluid and distribute it to the molding section. In particular, when the ingredients are relatively viscous,
If the reactivity is relatively fast, it is necessary to rapidly mix and stir the introduced ingredients and rapidly distribute the discharged mixture to the molding section. Particularly in the case of foam, the mixture should be supplied to the molding section and cured by foaming while avoiding an increase in the viscosity of the mixture and progression of the reaction as much as possible.

[Means for solving problems]

In order to solve the above problems, in order to mix and distribute and form in the shortest possible time, rapid mixing and agitation is performed in the mixing and agitation section, and roots are placed at the outlet of the mixing and agitation section. A delivery pump such as a pump or a gear pump is connected to actively suck the liquid, and a hose and a pipe are connected to the tip of the pump to convey the discharged mixed liquid to a predetermined position in the molding section. Details will be specifically explained in Examples based on the drawings.

[Effect]

The mixing and mixing device of this invention performs rapid mixing in the mixing and stirring section and actively sucks and delivers the mixture using the delivery pump, thereby preventing the viscosity of the mixture from increasing and producing a foaming mixture with low viscosity and low reaction.

〔Example〕

Fig. 1 is a schematic front view of the mechanism inside the housing of the high viscosity stirred mixed liquid delivery device of this invention and the internal mechanism of the delivery pump. The delivery pump is a fixed one, and the delivery pump is connected to the discharge port of the mixing and stirring section, and in this example, a Roots pump is used as an example of the delivery pump.

FIG. 2 shows another embodiment of FIG. 1, and the only difference from FIG. 1 is the form of the mixing and stirring section. That is, the mixing/stirring section in the housing has rectangular protruding blades arranged and fixed in a staggered manner around the rotating shaft, and the connection of the delivery pump is the same as that shown in FIG. 1.

In addition, in FIG. 2, a groove is formed in the rotating part of the upper part of the rectangular protruding wing to suppress the mixed liquid from rising in the opposite direction due to rotation.

In the figure, 1 is the housing, 2 is the rotating shaft, and 3
In FIG. 1, a plurality of bar-shaped protrusion blades 3 are fixedly arranged on the same circumference of the rotary shaft 2 in multiple rows above and below to form a mixing and stirring section. 3a in FIG. 2 is a rectangular protruding wing, which is arranged and fixed in a staggered manner on the rotating shaft. 4 is a discharge port for mixed liquid; 5;
Reference numeral 6 is an inlet for introducing ingredients, which is increased as necessary. Reference numeral 7 designates a connecting pipe that connects the discharge port and the delivery pump, 8 designates the delivery pump, and 9 designates the delivery port that delivers the mixed liquid to the molding section. Although this example shows an example of a Roots pump as the delivery pump, a gear pump or the like may be used as appropriate. Note that 10 is a groove provided around the rotating part at the upper part of the mixing and stirring part.

FIG. 3 is a schematic front view of the mechanism inside the housing of a conventional mixing/stirring device, in which 1 is the housing, 2 is a rotating shaft, 3 is a plurality of rod-shaped protruding blades on the same circumference of the rotating shaft 2, A plurality of rows are fixedly arranged above and below to constitute a mixing/stirring section, and 4 is a discharge port for the mixed liquid.

[Effect of idea]

As described in the operation section, the device of this invention suppresses the increase in the viscosity of the liquid mixture, and supplies a foaming liquid mixture with a uniform low viscosity and low reaction state with little variation to the molding section, resulting in foam molding. The desired foamed product is obtained with high yield and uniformity.

[Brief explanation of the drawing]

Figure 1 is a schematic front view of the mechanism inside the housing and the mechanism inside the delivery pump of the high viscosity stirred mixed liquid delivery device of this invention, and Figure 2 is a schematic front view of the mechanism inside the housing and the delivery pump of another embodiment of this invention. FIG. 3 is a schematic front view of the mechanism inside the housing of a conventional mixing and stirring device. 1...Housing, 2...Rotating shaft, 3, 3a...
... protruding wing, 4 ... discharge port, 5, 6 ... inlet for reactive compounding component liquid, 8 ... delivery pump.

Claims (1)

[Scope of utility model registration request] A mixing/stirring device with a large number of protruding blades fixed to a rotating shaft that can mix a plurality of reactive compounding component liquids introduced into a housing that stirs and mixes reactive compounding components such as hard urethane foam or phenolic resin foam. A high-viscosity stirred mixture of thermosetting resin characterized by a configuration in which a delivery pump is connected to the discharge port at the bottom of the housing to suck and deliver the mixture to the molding part so as to maintain the mixture at a low pressure. Sending device.