JP2006281720A - Supplying device and method for polyurethane foaming stock liquid component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the supplying device and method for a polyurethane foaming stock liquid, which realizes a proper temperature adjustment of a stock liquid feeding into a mixing head device even when the supplement of a large amount of the stock liquid at one time is necessary. <P>SOLUTION: This supplying device of the polyurethane foaming stock liquid component is equipped with a heat exchanger 3 for bringing a polyurethane foaming stock liquid component into a predetermined temperature range and a stock liquid tank 4 for storing the polyurehane foaming stock liquid component fed from this heat exchanger and equipped with a temperature adjusting function so as to be able to feed the polyurethane foaming stock liquid component from the stock liquid tank 4 to a mixing head 6 and, at the same time, to circulatingly feed the component from the mixing head 6 to the stock liquid tank 4 under the condition, in the middle of the feeding of the polyurethane foaming stock liquid component from the mixing head 6 to stock liquid tank 4, the component is fed to the heat exchanger 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a polyurethane foam stock solution component supplying apparatus and a supply method, and more specifically, a heat exchanger that brings a polyurethane foam stock solution component into a predetermined temperature range, and a polyurethane foam stock solution component fed from the heat exchanger and storing a temperature. An undiluted solution tank having an adjustment function, and the polyurethane foam undiluted solution component can be fed from the undiluted solution tank to the mixing head, and is fed from the mixing head to the undiluted solution tank for circulation. The present invention relates to a polyurethane foam stock solution component supplying apparatus and a supplying method.

  When manufacturing a component such as a panel having a polyurethane foam as a heat insulating material, the liquid polyol component and the liquid polyisocyanate component, which are the raw liquid components, are fed to the mixing section of the high-pressure or low-pressure mixing head device. A two-liquid mixing method is generally used in which the reaction is performed by mixing and stirring, and this mixed reaction liquid is discharged into a predetermined mold or on a face material.

When this polyurethane foam stock solution component (hereinafter sometimes referred to simply as “stock solution”) is supplied to the mixing section of the mixing head device, it is stored in the stock solution tank in advance, and the stock solution temperature is kept within a predetermined range from the mixing head device. The temperature is adjusted so that it can be discharged. When the stock solution is fed from the stock solution tank to the mixing head device to be discharged from the mixing head device, the stock solution is newly replenished into the stock solution tank from a separately placed stock drum can. In this case, if a large amount of stock solution is replenished at a time, it is difficult to adjust the stock solution temperature within a predetermined range. Therefore, every time the stock solution in the stock solution tank is reduced, the reduced amount is replenished ( For example, Patent Document 1. [0003] [0004] description).
JP 7-308932 A

  However, when manufacturing rigid polyurethane foam panels, etc., it may not be possible to discharge the stock solution from the mixing head device while replenishing the stock solution in small amounts. In such cases, replenish a large amount of stock solution at once. In this case, of course, proper temperature control cannot be performed.

  However, the stock solution tank is equipped with a stirrer. However, when the temperature of the stock solution for replenishment is low and the temperature difference from the stock solution in the stock solution tank is large, the specific gravity of the stock solution for replenishment is large, so it is quick. When moving to the bottom of the stock solution tank and being fed toward the mixing head, the low temperature stock solution is sent and discharged from the mixing head, which may result in poor foaming of the product.

  Therefore, in view of the above-described problems of the prior art, the object of the present invention is to provide a temperature suitable for the stock solution to be fed to the mixing head device even when it is necessary to replenish a large amount of stock solution at a time. An object of the present invention is to provide an apparatus and a method for supplying a polyurethane foam stock solution component that can be adjusted.

The above object can be achieved by the invention described in the claims. That is, the characteristic configuration of the polyurethane foam undiluted liquid component supply device according to the present invention includes a heat exchanger that brings the polyurethane foam undiluted liquid component to a predetermined temperature range, and stores the polyurethane foam undiluted liquid component supplied from the heat exchanger and a temperature. An undiluted solution tank having an adjustment function, and the polyurethane foam undiluted solution component can be fed from the undiluted solution tank to the mixing head, and is fed from the mixing head to the undiluted solution tank for circulation. And the polyurethane foam concentrate solution component is fed to the heat exchanger while it is being fed from the mixing head to the concentrate tank.

  According to this configuration, the polyurethane foam concentrate solution component is discharged from the mixing head, and even if it is necessary to replenish a large amount of polyurethane foam concentrate solution at once, it is returned from the replenished polyurethane foam concentrate component and the mixing head. Since both the polyurethane foam concentrate solution components in the specified temperature range are fed to the heat exchanger, leveling to an appropriate temperature is progressed by mixing them together, making it easier to adjust the temperature in the heat exchanger and mixing. It is possible to easily adjust the temperature appropriately for the polyurethane foam stock solution component fed to the head device. There is no need to process a large amount of the polyurethane foam stock solution component to be replenished by using a heat exchanger having a particularly large capacity, and the temperature of the polyurethane foam stock solution component can be easily adjusted only by using existing equipment.

  As a result, even when it is necessary to replenish a large amount of stock solution at once, it was possible to provide a polyurethane foam stock solution component supply device capable of adjusting the temperature appropriately for the stock solution fed to the mixing head device. .

  A fluid mixing means is provided on the upstream side of the heat exchanger for mixing and mixing the polyurethane foam stock solution component fed from the mixing head to the heat exchanger and the polyurethane foam stock solution component fed for replenishment. It is preferable that

  According to this configuration, the mixing of the polyurethane foam stock solution component fed for replenishment and the polyurethane foam stock solution component returned from the mixing head is more reliably homogenized.

  The polyurethane foam concentrate solution component supplying method according to the present invention is characterized in that the polyurethane foam concentrate solution component is brought to a predetermined temperature range by a heat exchanger, and the polyurethane foam concentrate solution component having a temperature range is adjusted to a predetermined temperature range. In the method in which the polyurethane foam stock solution component is fed from the stock solution tank to the mixing head, and the polyurethane foam stock solution component is fed from the mixing head to the stock solution tank for circulation. In the course of feeding the stock solution component from the mixing head to the stock solution tank, the solution is fed to the heat exchanger.

  According to this configuration, even when it is necessary to replenish a large amount of stock solution at a time, it is possible to provide a polyurethane foam stock solution component supplying method capable of adjusting temperature appropriately for the stock solution fed to the mixing head device.

  The polyurethane foam concentrate solution component is circulated and fed from the mixing head to the heat exchanger, and the polyurethane foam concentrate solution component circulated and fed, and the polyurethane foam concentrate component fed to the heat exchanger for replenishment And are mixed using a fluid mixing means on the upstream side of the heat exchanger.

  According to this configuration, it is possible to provide a polyurethane foam stock solution component supplying method capable of adjusting the temperature more appropriately for the stock solution fed to the mixing head device.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic overall configuration of a polyurethane foam stock solution component supply device (hereinafter sometimes referred to as a stock solution supply device) according to the present embodiment.

  This stock solution supply device feeds the stock solution from a separately prepared stock solution storage drum 1 to the heat exchanger 3 by a supply pump 2 and the like, and also feeds the stock solution adjusted to an appropriate temperature range by the heat exchanger 3. Then, it is fed to a stock solution tank 4 having a temperature control function, and after sufficiently stirring, the stock solution is sent from the stock solution tank 3 to the mixing head 6 via the metering pump 5 and the like. The stock solution sent to the mixing head 6 is always returned and circulated from the mixing head 6 to the stock solution tank 4 to reduce temperature fluctuations. In this embodiment, as will be described later, The stock solution is not returned directly from the mixing head 6 to the stock solution tank 4 but is returned to the heat exchanger 3 so that the temperature fluctuation of the stock solution is further reduced. At the time of discharge, a piston head (not shown) in the mixing head 6 is operated to discharge a stock solution (a two-liquid mixture described later) from the nozzle 6a at the tip of the mixing head 6. After the stock solution is discharged from the mixing head 6, the stock solution tank 4 is replenished with the necessary amount from the stock solution storage drum 1 through the heat exchanger 3.

  Since the stock solution sent from the stock solution storage drum can 1 is considerably low in winter and high in summer, the heat exchanger 3 adjusts the temperature to keep them within a predetermined temperature range. The heat exchange method is not particularly limited.

  The outer periphery of the stock solution tank 3 is covered with a temperature adjusting jacket 4a. Although not shown, water and other liquids within a predetermined temperature range flow from the outside through the jacket 4a. And it has the structure which has the stirrer 4b for fully stirring the stock solution in the stock solution tank 3. FIG. In addition, the figure number M is an electric motor which rotates the stirring blade of the stirrer 4b.

  Although not shown, the mixing head 6 is connected to another set of undiluted solution supply devices, and the two liquids are mixed and stirred in the mixing section of the mixing head 6, and this is mixed in the formwork or surface from the tip nozzle 6 a. It is discharged onto the material. The mixed stock solution discharged from the mixing head 6 is normally kept at a predetermined temperature in the range of 20 to 30 ° C. depending on the composition of the stock solution. For example, when using chlorofluorocarbon (HFC or the like) as the foaming agent, the temperature is about 20 to 25 ° C., and when using no chlorofluorocarbon, the temperature is about 25 to 30 ° C. Outside this temperature range, the viscosity will fluctuate and it will be difficult to discharge, and the reaction rate after mixing the two liquids will also be difficult to control, so temperature management will be an important factor.

  In this embodiment, the stock solution is not returned to the stock solution tank 4 but is returned to the heat exchanger 3 where the temperature is adjusted and then returned to the stock solution tank 4. As a result, the temperature range of the stock solution stored in the stock solution tank 4 can be maintained within a predetermined temperature ± 2 ° C. even when the amount of the stock solution replenished in the stock solution tank 4 is large. It becomes. That is, the undiluted solution sent from the drum 1 for replenishment and the undiluted solution returned from the mixing head 6 are merged and the temperature is adjusted by the heat exchanger 3 together.

  In this case, it is preferable that the combined stock solution is sufficiently mixed by the fluid mixing means 7 such as a static mixer on the side (upstream) before being introduced into the heat exchanger 3. In this way, even if a considerable amount of the replenishment stock solution is mixed and introduced into the heat exchanger 3, the time for adjusting the temperature range to a predetermined range can be remarkably shortened, which is convenient. When a static mixer is used as the fluid mixing means 7, a high mixing ratio can be obtained in a relatively short time, and the degree of uniformity becomes high. In addition, the number 8 is a check valve.

  The polyurethane foam stock solution used in the present embodiment is not particularly limited, and a component (polyol component) containing a generally used active hydrogen-containing compound, a foaming agent, a catalyst, and the like, and a polyisocyanate compound are the main components. (Isocyanate component) can be used.

[Another embodiment]
(1) The mixing head for discharging the polyurethane foam stock solution may be a high pressure type or a low pressure type, and is not particularly limited.

1 is a schematic overall configuration diagram illustrating a polyurethane foam stock solution component supply device according to an embodiment of the present invention.

Explanation of symbols

3 Heat exchanger 4 Stock solution tank 6 Mixing head 7 Fluid mixing means

Claims (4)

A heat exchanger for bringing the polyurethane foam stock solution component into a predetermined temperature range; and a stock solution tank for storing the polyurethane foam stock solution component fed from the heat exchanger and having a temperature adjusting function, the polyurethane foam stock solution In the polyurethane foam stock solution component supply device, the component can be fed from the stock solution tank to the mixing head, and is fed from the mixing head to the stock solution tank for circulation. Is supplied to the heat exchanger in the course of being fed from the mixing head to the stock solution tank. A fluid mixing means is provided on the upstream side of the heat exchanger for mixing and mixing the polyurethane foam stock solution component fed from the mixing head to the heat exchanger and the polyurethane foam stock solution component fed for replenishment. The polyurethane foam undiluted solution component supply apparatus according to claim 1. The polyurethane foam stock solution component is brought to a predetermined temperature range by a heat exchanger, and the polyurethane foam stock solution component that has been brought to the predetermined temperature range is supplied to and stored in a stock solution tank having a temperature control function, and the polyurethane is transferred from the stock solution tank to the mixing head In the polyurethane foam stock solution component supplying method, wherein the foaming stock solution component is fed from the mixing head to the stock solution tank and circulated, the polyurethane foam stock solution component is sent from the mixing head to the stock solution tank. A method of supplying a polyurethane foam concentrate solution component, wherein the component is fed to the heat exchanger during feeding. The polyurethane foam concentrate solution component is circulated and fed from the mixing head to the heat exchanger, and the polyurethane foam concentrate solution component circulated and fed, and the polyurethane foam concentrate component fed to the heat exchanger for replenishment The method of supplying a polyurethane foam stock solution component according to claim 3, wherein the components are mixed together and mixed using a fluid mixing means upstream of the heat exchanger.

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