JPS596219B2 - Manufacturing method of high-density urethane foam double block - Google Patents

Description

[Detailed description of the invention] The insulation block for the insulation wall on the wall surface, especially the bottom surface, of a large tank for storing liquefied natural gas (LNG) is designed to withstand a load (approximately 7Kf7/ Since it must withstand d), one made of high specific gravity urethane foam is used.

Generally, the cells of urethane foam form an oval shape, and the ratio of the compressive strength in the major axis direction to the minor axis direction is approximately 10:6, and the longer axis is larger.

Therefore, in order to obtain a urethane foam block with high compressive strength, it is desirable to have a composition in which the major diameters of the cells are uniformly arranged in the vertical direction. However, if the direction of foaming is horizontal during the foaming reaction, the long diameter of the bubbles will be oriented horizontally, and the compressive strength will be reduced. This requires consideration. That is, since the mixed liquid produced by the non-frosting method starts a foaming reaction several seconds after being poured, it is desirable that the liquid level of the mixed liquid in the mold is approximately horizontal at this point.
If the surface of the urethane foam block is flat with no irregularities, it is easy for the liquid level inside the formwork to become almost horizontal at the same time as shown above, and in this case, the direction of foaming is all upwards, so the block The compressive strength of each part is approximately equal and maximum. However, if the surface of the block is uneven, for example, if the core is temporarily fixed in the formwork to make holes for anchor bolts, the surface of the poured mixture will not be horizontal at the same time, and the core will not be level. Because the incubation reaction occurs with the liquid level in the vicinity slightly inclined, the vertical axis of the bubbles is diagonal or horizontal, and it has been demonstrated that the compressive strength of this part is inferior to other parts. . The following are high specific gravity O, 08
(The normal one is 0.03) This shows the foaming reaction mode for a high density urethane foam block. In Figures 1 to 3, when the foaming liquid mixture a is poured into the formwork from the break point of the core temporarily fixed in the formwork, the mixture liquid a fills the formwork. However, the core Pl,
On the backsides B, c, and d of p2 and p3, the flow velocity decreases,
When the foaming reaction starts several seconds after pouring, the surface remains slightly inclined as shown in FIG. 2 b', c', and d'.

Therefore, the foam structure formed by the foaming reaction is b'
, c', and d', as shown in Figure 3A, the bubbles g have vertical axes parallel to each other, and b', c'
, d', the vertical axis of the bubble is obliquely inclined as shown in Figure 3. The above experiment was carried out on a 1m x 1m x 0.2m formwork and the results were as follows: (1) In a block body without a temporary core, the average compressive strength = 8.26K2/d (2
) For block bodies when the core is temporarily installed, (a)
Strength of one side of the core = 7.65K'/Crit (b) Strength of one side of the other core = 6.40K'/Crl (c) Strength of one side of the other core = 5.34Kf7/d, etc. The numbers were obtained.

Based on the above, the present inventors temporarily installed weir plates on both sides of the core temporarily fixed in the frame, poured the foaming mixture into the space between the two weir plates containing the core, and instantaneously filled the space between the two weir plates containing the core. Then, both dam plates are removed to allow the mixed liquid in the space to flow and spread to every corner, and just before the reaction starts, a pressure lid is placed over the top of the frame to suppress the bubbling pressure and finish the reaction. We succeeded in obtaining a urethane foam insulation block with uniform compressive strength in each part.

The above is the manufacturing process for a high-density urethane foam insulation block that contains the cutouts, but the present invention not only includes the cutouts 13 and 14 as shown in FIGS. The present invention relates to a manufacturing method for a high-density urethane foam insulation block in which an embedding board 8 is embedded.

Examples thereof will be described below with reference to the drawings.

In FIG. 8, the cores 2, 2 are temporarily fixed in the molding frame 1, and the weir plates 3, 3 shown in FIG. If the foamed mixed liquid 5 is filled to the height of the cores 2, 2 and both the weir plates 3, 3 are removed instantly, the mixed liquid 5 flows from side to side and goes into the frame as shown in Fig. 9. Therefore, just before the foaming reaction occurs, the pressure lid 6 is covered to allow the reaction to proceed.

When the pressure lid 6 is removed after the reaction is completed, a lower block body 7 with a horizontal surface, that is, the vertical axes of the bubbles are vertically aligned, as shown in FIG. 11 is formed.

Next, as shown in FIG. 11, the embedded plate 8 and the upper core 9 are temporarily fixed on the lower block body 7, and the weir plates 10, 10 similar to those described above are erected on both sides of the embedding plate 8 and the upper core 9 is installed as described above. Similarly, the space between the two weir plates 10 and 10 is filled with the mixed liquid 11,
If both the weir plates 10, 10 are removed instantly, the mixed liquid 11
As shown in FIG. 12, the foam spreads over the lower block body 7 in the molding frame, so just before the foaming reaction occurs, the pressure lid 6 is covered to allow the reaction to proceed. (See Figure 13)
After the reaction is complete, take out the molded product from the frame and insert the core 2,
2 and 9, the upper block body 12 whose horizontal surfaces, i.e., the longitudinal axes of the bubbles are vertically aligned, is integrally joined with the similar lower block body 7, as shown in FIGS. 4 and 5. A high specific gravity heat insulating block having excellent compressive strength, which has a block body as shown, contains the cutouts 13, 13, and 14, and embeds the embedded plate 8 can be obtained. The compressive strength of the test pieces obtained by this method was 8.37 Kf/Crl on average. Incidentally, the insulation block 12 is usually 1 m x 2 m x 0.2 m. As mentioned above, in this method, weir plates are temporarily installed on both sides of obstacles such as cores, and the mixed liquid fills the area around the obstacles.
After instantly removing the weir plate and distributing the mixed liquid inside the frame, the reaction proceeds to form the lower block body, and then the embedded plate and upper core are temporarily installed on top of this, and then the same process is carried out. By this means, the upper block body is constructed, the upper and lower block bodies are integrally connected, and the embedding plate is embedded.

Therefore, it is possible to easily manufacture a high-density urethane heat-insulating block that accommodates the missing parts, embeds the embedding plates, and has uniform maximum strength in each part.

[Brief explanation of drawings]

Figures 1 and 2 are a plan view and a cross-sectional view showing the manufacturing process of blocks by the conventional method, Figures 3A and 3B are explanatory diagrams of the foamed structure, respectively, and Figures 4 and 5 are the blocks obtained by this method. Figure 6 is a sketch of the weir plate, Figures 7 to 13 are explanatory diagrams showing the manufacturing process of the insulation block by this method, and Figure 7 is the center view. FIG. 8 is a plan view of the molding frame to which the foam is temporarily fixed, FIG. 8 is a front view showing a state in which a weir plate is temporarily installed in the molding frame and the foaming mixture is poured into it, and FIG. 9 is a plan view of the molding frame after the weir plate is removed and pressure Fig. 10 is an explanatory diagram showing the form in which a foaming reaction has occurred;
Figure 1 is an explanatory diagram showing a mode in which a weir plate is placed on the lower block body in the molding frame, an upper core is temporarily installed, and further weir plates are erected on both sides of the weir plate and the foaming liquid is poured. FIG. 12 is an explanatory diagram showing a mode in which the weir plate is removed and a pressure lid is covered, and FIG. 13 is an explanatory diagram showing a mode in which the upper block body is integrally formed on the lower block body by the foaming reaction 5. 1... Molding frame, 2... Core, 3... Weir plate, 5...
- Foaming mixed liquid, 6... Pressure lid, 7... Lower block body, 8... Embedded plate, 9... Upper core, 10... Weir plate, 11... Foaming mixed liquid , 12... Upper block body, 13, 14... Missing part.

Claims (1)

[Claims] 1. After temporarily fixing the lower core 2 in the molding frame 1, temporarily installing weir plates 3, 3 on both sides of the core 2, and pouring urethane foaming liquid 5 between both weir plates 3, 3, The weir plate is removed, a pressure lid 6 is covered, and a foaming reaction is performed to produce a lower block body 7. An embedded plate 8 is placed on the lower block body 7, and an upper core 9 is temporarily fixed thereon. Weir plates 10 and 1 are provided on both sides of the upper core 9.
0 is temporarily installed, and the urethane foaming liquid 11 is filled between both weir plates in the same manner as described above.Then, the weir plates 10 and 10 are removed, and the inside of the molding frame 1 on the lower block body 7 is made into a flowing plane with the foaming liquid 11. none,
A method for manufacturing a double block of high specific gravity urethane foam, which is covered with a pressure lid 6 to cause a foaming reaction, embedding an embedding board inside, and having cutouts on the top and bottom of the embedding board.