JPS6016347B2 - Manufacturing method of composite board - Google Patents

Description

Detailed Description of the Invention The present invention is a composite material in which one type of polyurethane foam or polyisocyanurate foam, which has excellent self-adhesive properties as a core material and is useful as a high-quality upper material and a heat insulating material, is interposed between upper and lower base materials. This invention relates to a method for manufacturing a board.

When forming a composite plate or a composite using a base material, polyurethane foam, or polyisocyanurate foam (hereinafter simply referred to as foam), the foam stock solution is distributed in streaks on one base material, and then It was common to manufacture composite boards by laminating other base materials on top of the base material and then applying heat and pressure.

In this case, the viscosity of the raw material when the foam stock solution is mixed is about 150 to 25 ratio p at about 2000, and has sufficient fluidity. Therefore, when the foam raw materials immediately after being mixed are discharged or sprayed in a linear form, a part of the surface of the base material will be covered even with the physical properties in this state. As a result, the part where the liquid raw material first comes into contact with the base material has good adhesion because it has a good wettability with the base material, while other parts lack adhesiveness because they come into contact within the cream time, and the base material becomes foamy. It had the disadvantage of peeling off. To explain further, the raw material discharged in the form of a line (streak) gradually foams and becomes bulky, and the cream thyme raw material, which lacks adhesive strength, comes into contact with the base material surface other than the part where it was first laminated, and this is used as the base material. Since the gel time and rise time change, the foam and the base material are likely to separate. In addition, the foam structure of the foam produced in this manner has the drawback that the cells have a strong spherical shape, directional ellipses, or large cells. Furthermore, since cells are formed at the same time as the foam is reacted and foamed, the cell membrane is thin, has poor mechanical strength, and tends to shrink without forming a skin layer. there were. Of course, fire resistance was a function of the foam itself. In order to eliminate such drawbacks, the present invention sprinkles the foam raw material on the aggregate, and when the raw material attached to the aggregate reaches the gel time, it is distributed in dots on the base material, and the adhesive strength and This paper proposes a method for manufacturing composite plates that have significantly enhanced mechanical strength, fire resistance, and dimensional stability and do not peel.

EMBODIMENT OF THE INVENTION Below, the manufacturing method of the composite board based on this invention is demonstrated in detail using drawing.

FIG. 1 is a schematic configuration diagram showing an example of an apparatus for carrying out the above invention, and 1 is a lower base material for the surface, such as a metal plate (
2 is the upper substrate for the surface, which is a sheet laminated with one or more of kraft paper, asbestos paper, aluminum foil, asphalt roofing, etc. Consists of things like
3 is a mixing and dispersing machine, which consists of a primary mixer 4 and a secondary mixer 5, and the primary mixer 4 is a polyol component (so-called liquid A, which is composed of a polyol, a blowing agent, a foam stabilizer, a catalyst, etc.) and a polyisocyanate component (so-called B liquid), for example, by the Waso shot method to a concentration of 20 to 25 oo.
Mixing is carried out using a rotating blade of 0 to 500 pm.

In addition, the secondary mixer 5 has approximately 500 to
It has a structure with one end closed and is equipped with a rotary blade that rotates at 300 pm.The material is mainly mixed with cream-like raw materials and aggregate 6 to form dots made of granules on the upper base material 1. This is for distribution. In other words, in the secondary lamination machine 5, the aggregate 6 falls from above the rotary blade body 5a, and as it descends in a spiral while rotating on the inner wall of the cylinder body 5b, the raw material is injected from the injection port 5c, and the aggregate is crushed into bones. The aggregate 6 rotates and descends while being mixed with the aggregate 6, and the raw material is sprinkled on the surface of the aggregate 6, so-called adhesion, or partially penetrates, and the raw material is discharged and dispersed to the outside from the entrance 5d of the cylindrical body 5b. Sometimes, the properties of the raw material sprinkled on the bone layer 6 are such that they reach gel time. The entrusted aggregate 6 mainly has mechanical strength, fire resistance,
It functions as a core of granular material consisting of cells and a reinforcing material for dimensional stability, such as pearlite grains, vermiculite, shirasu balloons, silica sand, talc, bentonite,
It consists of one or more types of other artificial granules. It is preferable to use aggregate 6 with a diameter of about 0.5 to 2 mm, and the amount added, that is, the mixing ratio is about 0.5 to 1 in weight ratio to foam stock solution 1. (in the case of pearlite), and the proportion increases with large silica sand. 7 is a heating and pressurizing device that includes an upper mold belt 8, a lower mold belt 9 facing the upper mold belt 8 at a certain distance, and a drive wheel 10;
11, driven wheels 12, 13, heating and pressurizing devices 14, 15, and suppressing rollers 6, 17, which control the thickness of the foam and apply pressure to promote the reaction of the foam. It is overflowing.

As the belts 8 and 9, steel belts or heat-resistant belts made of other materials are used. Although not shown, a caterpillar type heating and pressurizing device may be used instead of the belt. Next, to explain the manufacturing method of the composite plate according to the present invention, the lower base material 1 has a thickness of 0.
．． Asbestos paper is prepared as the upper base material 2 using a colored steel plate on the 27 side formed into a gutter shape.

In addition, the raw materials for polyurethane foam, liquids A and B, are approximately 2
Insulated at 0qo, heated, pressurized bag counterfeit, lower mold belt 8
. Further, as the bone village 6, pearlite grains having a particle size of about 3 J are used.
Therefore, when the lower base material 1 reaches directly below the secondary mixer 5, the foam raw material mixed in the primary mixer 4 is injected in a cream state onto the aggregate 6, and the secondary mixer 5 The inner wall of the body 5b is rolled by the rotary blade body 5a, and the surface of the aggregate 6 is fed downward while being sprinkled with the raw material, and the lower base material is drawn in a ring-shaped pattern from the lower end opening 5d. 1 is discharged. At this time, the aggregate 6 is sprinkled, the so-called adhered raw material reaches the gel time from the cream time, foams to some extent, and is discharged as a granular structure in which the aggregate 6 exists as a core in the center. Diagram a
, b. Then, at the point where the aggregate 6 distributed on the lower base material 1 falls,
The reaction and foaming occur from gel time to rise time, and the foamed structure finally changes to those shown in Figure 2 c and d. That is, the aggregate 6 discharged and distributed on the lower base material 1 as shown in figures a and b changes over time as shown in figure c,
Moreover, the foam raw material is in contact with the lower base material 1 in a gel time state, and a skin layer is formed between the ribs 6 which is thicker than the thickness of the foam tissue. Note that the upper base material 2 is an aggregate 6
After it is dropped, it is layered during the gel time. Next, a granular reaction with the aggregate 6 as a core occurs between the upper and lower base materials 1 and 2, and the foam raw material in the middle of foaming is heated and fed to the pressurizing device 7 to regulate the thickness. At the same time, the reaction and foaming of the foam raw material is apparently completed, and the composite plate is sent out from the outlet. Therefore, when the composite plate was cut and observed, it was found to be as shown in FIGS. 2, c, and d. Next, when comparing the composite plate manufactured by the manufacturing method according to the present invention and the composite plate manufactured by the conventional method, the results are as follows. Regarding adhesive strength, as shown in Figure 3, the foam raw material was discharged by each method onto a steel plate (color steel plate, 0.27 willow thickness) A, and the free foamed surface of the foam raw material was slightly cut. Then, a steel plate A2 coated with an epoxy adhesive was adhered thereto, the steel plate A was fixed, and the steel plate A2 was pulled in the direction of the arrow.

The thickness of the foam at this time was about 5 ribs, the specific gravity of the pearlite-containing foam of the present invention was 0.06, and the specific gravity of the conventional product was 0.025. The composite ratio according to the invention is about 5
~10k9'c cure, and the subordinate product was approximately 1~3kg/me.

(o) Regarding fire resistance, test each composite plate from the steel plate side using a Bunsen burner.
When heated for about 5 minutes, the conventional product had almost no foam on the contact surface and was on the verge of falling off.

On the other hand, the composite plate according to the present invention had some burnt parts, but it functioned satisfactorily as a foam.
However, when comparing the dimensional stability in the vertical direction and the shape on the plane, the form of the composite board according to the present invention shows no visually large deformation in both the vertical and horizontal directions, and the aggregate 6 is sufficient. It seemed to be reinforcing the contraction.

On the other hand, the form of conventional products is approximately 10~10 mm on both sides.
15% shrinkage or large deformation was observed. This is because the foam according to the present invention had the aggregate 6 as its core and was formed of clusters of small cells, and the skin layer of each cluster and the aggregate 6 worked effectively. As described above, according to the method for manufacturing a composite board according to the present invention, it is possible to significantly improve the adhesive strength that greatly affects the strength of the composite board, and also to produce a composite board with improved fire resistance and dimensional stability. There are features that allow it.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an example of an apparatus for carrying out the method for manufacturing a composite plate according to the present invention, and FIGS. 2 a to 2 d are perspective views and end views showing a part of the process for manufacturing the composite plate according to the present invention. The figure, a plan view, a longitudinal sectional view showing a part of the composite board itself, and FIG. 3 are explanatory diagrams showing the shape of a test piece for measuring the adhesive strength of the present invention. 1, 2...Upper, lower base material, 3...Mixing, dispersion machine, 4...
...Primary mixer, 5...Secondary mixer, 6.
...Aggregate, 7...Heating and pressurizing device. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In manufacturing a composite board in which one of polyurethane foam and polyisocyanurate foam is integrally interposed between the upper and lower base materials, a cream-like raw material mixed with the ingredients of the above-mentioned foam stock solution and aggregate are used. The mixed raw materials are sprinkled on the aggregate, and the sprinkled raw materials are discharged onto the lower base material as granules that have reached the gel time and are distributed in dots, and then the bones distributed in dots are distributed. A method for manufacturing a composite plate, comprising: laminating an upper base material on top of the composite plate, and applying heat and pressure to fix these constituent materials together by self-adhesion during reaction and foaming of the raw materials.