JPS5816832A - Mixing apparatus of two-pack type aerosol system urethane foam manufacture - Google Patents

Abstract

PURPOSE:To perform excellent foaming of urethane at a desired spot by a simple operation, by joining the conduits of the same diameter and an equal length connected to the pessure vessels into one mixing tube and specifying the ratio of the cross-sectional area of the conduit and that of the mixing tube. CONSTITUTION:The first liquid composed of an isocyanate and Flon and the second liquid composed of a polyol anf Flon are brought under an atmospheric pressure via the conduits 1, 2 from the pressure vessels 5, 5 in which these liquids are respectively contained. A button nozzle 4, 4 is attached at one end of each conduit 1, 2, the conduits 1, 2 of the same diameter and an equal length connected to each pressure vessel 5, 5 are joined into one mixing tube 3 and the ratio of the cross-sectional areas of the conduits 1, 2 and the mixing tube is made 5-100. By the above, it enables to perform urethane foaming at a desired spot by a simple operation and a low cost mixing apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixing apparatus for two-component azole casting/foam production.

There is no production of urethane foam using the aerosol method.

There are two methods for manufacturing urethane foam using the aerosol method: a one-part method and a two-part method.In the one-part method, isocyanate resin,
When the nonorubu of the ale container containing surfactant and catalyst fat is opened, the contents form urethane foam due to vaporization expansion of the fluorocarbon gas, and then this foam reacts with moisture in the atmosphere and hardens. A urethane foam is obtained. - 10,000, a first liquid containing an aerosol stock solution containing iso7anate as a main component and CFC 11 as a propellant in an aerosol container.

Propylene glycol, polyethylene glycol.

Polyether polyols containing aquatic groups such as glycerides,
There is a two-component method in which a urethane foam is obtained by mixing an aerosol stock solution (second solution) containing an organic tin compound, a catalyst such as an amine, and a surfactant at a desired location. In either of these methods, the contents of the aerosol container are squirted out onto the shoe after the lubricant is opened, forming a foamed urethane foam. In the case of a two-liquid reaction type, the injected materials of the first liquid and the second liquid are introduced into a mixing device by a /SS jib, and mixed and foamed in the mixing device to obtain a urethane foam.

゛ In general, the one-component type air leakage curing reaction is carried out by the iso-7 penate resin bubbles formed by an aerosol being cured by moisture in the air, but the curing time depends on the moisture in the air and The curing time depends on the temperature, with an average of about 12 hours in the hot and humid summer months.
In winter, when temperatures are below freezing and dry, it can take more than 48 hours. Therefore, the workability outdoors is poor and is unsatisfactory from a practical standpoint. On the other hand, the two-component type 1 is almost unaffected by outside temperature and humidity, and has a hardening time of 3~
There are 100% foam in about 10 minutes, the expansion ratio is 30 to 50 times, and the workability is very good. However, the injection of the first liquid containing isocyanate resin and the second liquid containing polyether polyol is a certain ratio ↑ If they are not mixed uniformly, the desired curing time will not be obtained, and a satisfactory urethane foam will not be obtained. In large-scale industrial on-site foaming, a two-component mixing device is designed so that uniform foaming can be obtained by mixing when foaming is performed.

At present, a helix mixer, which has a spiral plate housed in a mixing chamber, is generally used because it is highly efficient and effective.

The helix mixer mentioned above has excellent performance, but when used in the aerosol method, the mixing device becomes disposable! It is expensive, and even if it is reused with nonner, etc., the inside cannot be thoroughly cleaned.

The present invention has been made to eliminate the above-mentioned drawbacks of conventional mixers, and provides a two-component azole urethane foam mixing device that is easy to operate, disposable, and sufficiently inexpensive. be.

The present inventors have discovered that isocyanates and fluorocarbons as propellants
A first liquid consisting of gas and a first liquid consisting of polyol and chlorofluorocarbon gas are housed in separate pressure vessels, and the contents are simultaneously injected from each vessel into one mixing tube via a conduit. The present invention was completed by discovering that when there is a specific relationship between the conduit and the mixing tube when mixing the liquids, the two liquids can be mixed and reacted very well and an excellent urethane foam can be obtained.

That is, the object of the present invention is to manufacture a two-component azole urethane foam, in which two pipes of the same diameter are connected at one end to the outlet valve of a pressure vessel containing each liquid through a zethane spout. It consists of two long conduits and a mixing tube whose other ends meet and are connected, and the cross-sectional area ratio of the conduit to the mixing tube is 5 to 100.
℃ achieved by liquid molding azole type urethane foam manufacturing mixing equipment.

The first liquid consisting of isonoanate and fluorocarbons and the second liquid consisting of polyol and fluorocarbons used in the present invention are as follows:
The pressure, injection speed, and liquid viscosity also vary depending on the temperature, and exhibit values as shown in Table 1, for example.

20 70 3.7 95 3.83
0 40 4.6 55 4.7 According to Table 1 above, at the same temperature 1, the first and second liquids have approximately the same viscosity and pressure, and they must be taken out from each pressure vessel and mixed at the same time. It turns out that you can.

According to the present invention, when the conduits from the pressure vessels containing the first liquid and the second liquid are brought to atmospheric pressure by valves, the contents are ignited and vaporized, causing both liquids to form a remarkable foaming state in the conduits. The two conduits reach the confluence of the mixing tube, where they are mixed and reacted with each other in a highly turbulent state in the mixing tube, and urethane foam is continuously produced. “By the way, the higher the temperature of the liquid in the pressure vessel, the higher the vaporization expansion rate of the fluorocarbons and the lower the viscosity of the liquid, so the injection speed of the contents also increases, and the turbulent flow in the mixing tube becomes more intense, resulting in more thorough mixing. When the reaction takes place, it becomes K. The influence of the length of the mixing tube on the reaction is as shown in Table 2.

2nd Table 5 1000 Uniform 5
700 Uneven 10 500 Slightly Uneven - 20300 Uniform 30 200 Uniform - Good urethane foam can be obtained from the condensation shown in Table 2 even when working at relatively low temperatures (5°C) as long as the mixing tube is 1000 mm long. This shows that a length of 300 mm is sufficient at room temperature.

The inventors of the present invention further investigated the influence of the ratio of the canned liquid supplied from the pressure vessel on the reaction of both liquids by changing the ratio of the diameter of one conduit to the diameter of the mixing tube.

That is, the temperature of the can liquid is 25°C, the pressure is 4.1 #/cr1.
The injection speed was 4.59/sec, and each conduit had an inner diameter of 06 mm and a length of 100 mm, and the length was 1000 m.
The state of the urethane foam obtained by changing the inner diameter of the mixing tube was investigated. The results are shown in Table 3.

Table 3 Form formation 0.6 people slow 1.4
llA Good 2.0'
Z Good 3.1”A
Good 3, 636 people Good 6.0 1 Chopsticks Good 7.0
From the results in Table 3, it can be seen that a good urethane foam can be obtained with a cross-sectional area ratio of the mixing tube to one conduit of 5 to 100''r!

Therefore, in the two-component azole urethane foam mixing device of the present invention, conduits of the same diameter and length connected to each pressure vessel are connected to a single mixing tube, and the cross-sectional area of the conduit is equal to the cross-sectional area of the mixing tube. There are products with a ratio of 5 to 100, and with this mixing device, it is possible to apply excellent urethane foam to a desired location on-site with extremely simple operations.

The conduits and mixing tubes used in the present invention 1 are preferably flexible tubes made of vinyl chloride resin, etc. As shown in FIG. 1, one end of each conduit (1, 2) is VC13? Tongue spout (
4) is attached so that it can be easily connected to the pressure vessel (5), and the conduit pipes (1, 2) and the mixing pipe (3)
) can be connected by heat glue, adhesive or other known methods. In the joint part 1, the openings of the inner conduit can be placed in the same plane to make the mixing and reaction of the two liquids more complete, but if the openings of the two conduits are arranged in a slightly spiral shape, the mixing can be further improved. is carried out sufficiently. In addition.

This mixing device is extremely inexpensive and can be easily disposed of.
It also has excellent workability as it can be disposed of after use.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining a mixing device according to the present invention. Code in the figure: 1.2...Conduit 3...Mixing pipe 4...
・Zeta/nozzle 5...Pressure vessel No. 1 Drawing procedure amendment September 1982 Patent application No. 113622 2, title of invention 2-component azole mixing device for manufacturing urethane foam 3
, Person making the amendment Relationship to the case: Name of patent applicant: Tokyo Aerosol Chemical Co., Ltd. 1) On page 2, line 4 of the specification, "diethiether" is amended to "dimethyl ether." 2) On page 2, line 9, "one element component" is corrected to "one principal component". 3) On page 2, line 10, "Freon 11" is corrected to [propellant-1 such as Freon 12.11]. 4) On page 2, line 12, "aquatic group" is corrected to "hydroxyl group." 5) Page 2, lines 13-14, “Surfactant-1
and ``contains'', add 1, ``propellant such as fluorocarbon 12.11''. 6) Same page 3, line 7, [low temperature corrects -1 to "low temperature t". 7) On the 5th line from the bottom of page 4, "1st liquid" is corrected to "2nd liquid." 8) On page 6, line 6 of the same, amend "benshite" to "via".

Claims (1)

[Claims] Two conduits of equal inner diameter and length, each with one end connectable via the outlet valve [& tongue nozzle of each pressure vessel], and a mixing tube with the other ends of these conduits connected at a confluence. Therefore, the cross-sectional area ratio of one conduit and mixing tube is 5 to 10.
2. A two-component azole mixing device for producing urethane foam, characterized in that the mixing device has a temperature of 0.