JPH0442093Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] This invention is used in the production of foam molded products to prevent the tendency of stagnation by ensuring good mixing and smooth flow of a high viscosity liquid mixture of reactive compounding components such as hard urethane foam or phenolic resin foam. Mixing and delivery of thermosetting high viscosity resin liquid with excellent pressure rise suppressing effect aimed at creating a device that can promptly deliver the mixture to the molding section in accordance with the discharge amount of the mixture transferred to the discharge port without causing pressure rise. It is related to the device. [Prior Art] Conventional mixing devices for reactive compounding components of this type have a rotating shaft with a large number of protruding blades for mixing and agitation, and all of them are mainly used for mixing. , those that are considered to be able to be mixed sufficiently are, for example, Tokuko No. 32-6376, Tokoku 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 that uses natural falling without using power, such as the
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. If the viscosity becomes particularly high, the internal pressure inside the stirring device will increase rapidly, resulting in a high viscosity and high pressure state that will be discharged, making it difficult to feed the mixed liquid into the molding device installed at the discharge port. This causes problems such as hoses falling off and other 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 device,
When making rigid urethane foam or phenolic resin foam boards or panels with a high viscosity liquid mixture, the higher the viscosity, the higher the discharge pressure.
When a long hose and injection pipe are connected to the discharge port to distribute the discharged high-pressure liquid mixture to the molding section, the pressure increases further. 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, broken or falling hoses, and problems with the hoses. 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 supply pressure result in fluctuations in the flow rate ratio. Therefore, it is necessary to reduce the discharge pressure of the above-mentioned problem, and to achieve sufficient mixing in a short time and discharge at a constant transfer speed, as well as 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 setting of , it is necessary to more actively suck and discharge the fluid and distribute it to the molding section. [Means for Solving the Problems] It is completely impossible to solve the above problems with conventional mixing and agitating devices that mainly perform mixing. Of course, a type of device that does not use a strong mixing system cannot achieve uniformity in a highly viscous mixture of reactive formulation components. Therefore, as a mixing mechanism, the inventors first performed strong mixing in the first stage with a structure mainly for mixing, and in the second stage, performed screw transfer mainly for liquid feeding, and In order to further improve the uniformity of the mixture and to actively discharge the mixture while sufficiently maturing it to prevent the mixture from stagnation, a mixing and stirring device is installed in the same mixing and stirring device. It was devised that the problem could be solved by providing a stirring section and a liquid feeding/mixing section. That is, a mixing/stirring section with protruding blades on the rotating shaft is installed in the upper part of the housing of the mixing/stirring device, and a liquid feeding/mixing section with spiral blades on the same rotating shaft is installed in the lower part. be. With this configuration, the liquid mixture with increased viscosity, which is a mixture of a plurality of reactive compounding components introduced into the upper mixing and stirring section, is actively sent out in the liquid feeding and mixing section, so that it can be delivered inside the housing. The purpose is to shorten the residence time of the liquid, suppress pressure rise, and discharge and supply a suitable mixture for molding. The relationship between the occupancy ratio of the mixing and agitation section and the liquid feeding and mixing section is an important factor. For example, the length of the housing is usually 0.4 to 0.6 for the mixing and stirring section at the top, and 0.6 to 0.4 for the liquid feeding and mixing section. Furthermore, depending on the type and properties of the reactive ingredients, if faster and more aggressive transfer is required,
Depending on each situation, the length of the liquid feeding and mixing section can be increased, the slope of the spiral blade can be made steeper,
Measures such as increasing the length of the housing are taken as appropriate. The above-mentioned relationship between the occupancy ratio of the mixing and agitation section and the liquid feeding and mixing section is appropriately determined by taking into consideration the relationship between the viscosity of the mixed liquid, the thickness of the molded panel, the discharge amount, and the like. The mechanism inside the housing has been explained above, but this idea is designed to avoid further pressure increase because the discharged mixed liquid is mixed inside the housing, sent out, and discharged from the discharge port, and then distributed to the molding section. Install a delivery pump such as a Roots pump or gear pump at the discharge port to prevent
A hose and a pipe are connected to the tip of the molding unit, and the discharged liquid mixture is transported to a predetermined position in the molding section. [Function] Due to the above-mentioned configuration of the mixing and delivery device of this invention, the reactive mixed viscous liquid is rapidly transferred and discharged without staying in the housing more than necessary, so the discharge pressure is significantly increased. The temperature can be lowered and the appropriate working steps can be continued to obtain the desired good mixture. For example, if the housing diameter is
In a mixing/stirring device with a diameter of 60 mm and a rotating shaft of 30 mm, the length of the upper mixing/stirring section is 70 mm and the length of the lower liquid feeding/mixing section is 80 mm.The blended liquid is: Liquid A - Phenol resin solution, Viscosity 5000cp (25
°C), C liquid - catalyst for phenolic resin, viscosity 50 cp (25
℃), the mixing ratio is A liquid: C liquid = 100/10, and the discharge rate is 20 kg/min, as shown in the following comparison table, there is a significant decrease in the discharge pressure.

〔Example〕

Figures 1 and 2 are schematic front views of the internal mechanism of the housing of the mixing and delivery device of this invention and the internal mechanism of the delivery pump. In this system, rod-shaped protruding blades are arranged in a Christmas tree shape on a rotating shaft, spiral blades are formed on the rotating shaft in the lower liquid feeding and mixing section, and a delivery pump is connected to the mixed liquid discharge port. In Figure 2, the upper mixing and stirring section has rectangular protruding blades arranged and fixed in a staggered manner around the rotating shaft, and the configuration of the helical blades and delivery pump in the lower liquid feeding and mixing section is the same as in Figure 1. The same is true. In the figure, 1 is a housing, 2 is a rotating shaft, and 3 is a housing.
1 is a protruding blade, and in FIG. 1, a plurality of rod-shaped protruding blades 3 are fixedly arranged on the same circumference of the rotary shaft 2 in multiple rows above and below to form the mixing and stirring part MS.
Further, a plurality of spiral blades 4 are provided on the same rotary shaft 2 at the lower part of the upper mixing/stirring part MS to form a liquid feeding and mixing part DS for performing liquid feeding and mixing. 5,
6 is an inlet for the blended components, 7 is a discharge port for the mixed liquid, 8
1 is a connecting pipe connecting the discharge port and the delivery pump, 9 is the delivery pump, and 10 is the delivery port for delivering 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. 2 is the same as the configuration shown in FIG. 1, except that the protruding blades of the mixing stirring part MS are arranged and fixed in a staggered manner on the rotating shaft 2, with rectangular protruding blades 3a arranged and fixed in a staggered manner. FIG. 3 shows another embodiment of the mixing and stirring section of this device, in which circular protruding wings 3b are arranged and fixed on the rotating shaft 2 in a staggered manner instead of the rectangular protruding wings shown in FIG. This is a front view of the mechanism inside the housing, with illustration of the delivery pump omitted. In addition, in FIGS. 2 and 3, a groove 11 is formed around the upper rotating part of the mixing/stirring part to prevent the mixed liquid from rising in the opposite direction. FIG. 4 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 rod-shaped protruding blade, and a plurality of them are arranged 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 7 is a discharge port for the mixed liquid. [Effects of the invention] As described in the section of the above-mentioned function, the device of this invention can exhibit excellent functions and can significantly reduce the discharge pressure of the mixed liquid. There are no defects in the manufacturing process such as defects, backflow of mixed resin, decrease in flow rate, fluctuations in flow rate ratio, etc., and a delivery pump is attached to deliver the discharged mixed liquid to the molding section.
The increase in pressure and viscosity caused by conventional delivery to the molding section is suppressed, a good molding mixture is supplied, and a suitable uniform product can be obtained.

[Brief explanation of the drawing]

1 and 2 are front views of the internal mechanism of an example of the mixing and delivery device for thermosetting high viscosity resin liquid of this invention, and FIG. FIG. 4 is a front view of the internal mechanism of the housing showing the embodiment, and is a schematic front view of the inside of the housing of the conventional mixing and stirring device. 1...Housing, 2...Rotating shaft, 3, 3a,
3b...Protruding blade, 4...Spiral blade, 5, 6...Inlet for blended component liquid, 7...Discharge port, 9...Delivery pump, MS...Mixing stirring section, DS...Liquid feeding and mixing Department.

Claims (1)

[Scope of utility model registration request] A mixing/stirring device having a large number of protruding blades on a rotating shaft capable of mixing a plurality of reactive compounding component liquids introduced into the upper part of the housing that mixes and delivers reactive compounding components such as hard urethane foam or phenolic resin foam. A liquid feeding and mixing part having a spiral blade is set on the rotating shaft at the lower part of the unit, and a delivery pump that actively suctions and sends the mixed liquid discharged from the discharge port of the device to the molding part is installed. A mixing and delivering device for a thermosetting high viscosity resin liquid characterized by a configuration connected to an outlet.