JPH0428727Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) The laminate of the present invention has excellent nonflammability and heat insulation performance, and is easily post-processed, so it can be used, for example, for interior panels of buildings, as well as for heat insulation of plants, vehicles, ships, etc. (Prior Art) Conventionally, in addition to foamed urethane boards, foamed gypsum boards, ALC boards, etc. have been used as foamed insulation materials. Each of these various boards has its own advantages and disadvantages, with foamed urethane boards being poor in terms of non-combustibility, and inorganic foamed gypsum boards and ALC boards being poor in terms of weight and flexibility. (Problems that the invention aims to solve) The problems are that conventional inorganic insulation panels are heavy and not flexible, and they require saws (including those with special saw blades) to cut the panels. The point is that it was necessary. (Means for solving the problem) The present invention uses inorganic gypsum and blast furnace slag to exhibit nonflammability, contains urethane resin to exhibit flexibility, and utilizes mechanical foaming and reaction hardening of urethane. This results in a high foaming ratio and good production efficiency. The configuration of this invention will be explained in detail below. A foaming agent is added to a slurry containing gypsum and blast furnace slag as essential components, and the slurry is mechanically foamed onto a moisture-permeable base sheet a, and the solid content of the slurry is 1 to 20%.
A foamed slurry made by adding and stirring a urethane prepolymer is applied, and a moisture permeable base sheet b is further laminated thereon. When this foamed slurry hardens, it becomes a foamed mortar layer. Therefore, as shown in FIG. 1, the laminate has a foamed mortar layer 3 sandwiched between moisture-permeable base sheets a1 and b2. The thickness of this laminate may be controlled before or after the moisture permeable base sheets are stacked together. Regarding individual components, the moisture-permeable base sheet may be made of a material or structure that does not impede breathability, such as synthetic paper such as polyester, polyurethane, polystyrene, rayon, Tetron, or nylon, or nonwoven fabric, or cloth fabric,
Alternatively, natural paper such as cellulose paper, natural fiber cloth, or the like may be used. Here, the term "moisture permeable" is used to facilitate the dissipation of excess moisture in the mortar layer. Next, the gypsum may be any of dihydrate gypsum, hemihydrate gypsum, and anhydrite gypsum, and may even be by-product gypsum such as phosphate gypsum as long as it is stable and normally used industrially. In addition, the blast furnace slag referred to in this invention is generally obtained in the form of a by-product of a steel factory, and its basicity, that is, the total ratio of CaO, MgO, and Al ₂ O ₃ , is determined by SiO _2
It is desirable that _the value divided by the ratio _{of 2} O) could not be done,
In the end, a good quality cured product cannot be obtained. The foaming agent used in the present invention may be a surfactant used in the detergent industry, in addition to those commonly used as a foaming agent for gypsum or Portland cement. Examples thereof include polyoxyethylene alkyl phenol ethers, aromatic hydrocarbons, sulfonates, protein surfactants, alkylaryl sulfonates, and the like. These foaming agents may also be dispersed foaming agents (e.g.
(sodium bicarbonate, azodicarbonamide, etc.). The urethane prepolymer referred to in this invention is a high molecular weight compound that partially has isocyanate groups, and it is a compound containing isocyanate groups such as tolylene diisocyanate, polydiphenylmethane diisocyanate, xylene diisocyanate, etc. Polyol ether is reacted with an NCO/OH equivalent ratio of 1.5 or more, and in order to have affinity with water, the oxyethylene content in polyoxyethylene polyol ether is contained at 5% by weight or more. It is also preferable to use one obtained by using Other substances used in the present invention include, if necessary, plasticizers (e.g., ethylene glycol monomethyl ether, methanol, etc.), thickeners (e.g., methyl cellulose, polyvinyl alcohol, hydroxyl methyl cellulose, etc.), pigments (e.g., Calcium carbonate, titanium oxide, silica powder,
clay), fibers (e.g., glass fiber, synthetic fibers, etc.), hydraulic cement (Portland cement, silica cement, etc.), aggregates (perlite, agarite, expanded polystyrene, etc.), binders (colloidal silica, synthetic resin emulsions, etc.) It is possible to add The specific method for mechanically foaming a slurry containing gypsum and blast furnace slag as essential components using a foaming agent such as a surfactant may be the same as the method for producing ordinary foamed concrete. It is sufficient to stir the slurry at high speed while controlling the volume of the slurry using a high-speed mixer and entraining air bubbles so that the specific gravity becomes a predetermined value. At this time, since the slurry has hydraulic properties, a retarder or an accelerator may be added in advance to adjust the curing time. Such a retarder is
Examples include citrate, magnesium silicofluoride, polyhydroxy compound, gluconate, lignin sulfonate, and the like. Examples of the accelerator include calcium chloride, aluminum chloride, sodium carbonate, sodium silicate, and sodium aluminate. As described above, the foamed slurry can be stabilized in this state for up to about 3 hours by adding additives such as retarders or accelerators. Furthermore, the laminate of the present invention can be continuously produced,
In order to increase production efficiency, it is necessary to cure rapidly. Conveniently for this purpose, the foamed slurry is rapidly hardened by adding the urethane prepolymer to the foamed slurry and stirring the mixture.
Highly efficient productivity can be obtained. For this reason, it is considered efficient to add the urethane prepolymer immediately before the molding process. In order to add the urethane prepolymer to the foamed slurry, a method of quantitatively mixing the prepolymer using a static mixer, a stirring mixer, or the like may be used. The amount of urethane prepolymer added at this time is
It should be in the range of 1 to 30% by weight based on the total dry weight of gypsum and blast furnace slag used in the present invention. If the amount is less than 1% by weight, the flexibility of the cured foamed product will be poor and cracks will occur when external force is applied. Moreover, if it exceeds 30% by weight, not only will it not be possible to obtain the nonflammability as defined in the present invention, but the properties of hydraulic cement will not be exhibited and the hardness etc. will be low.
When the amount of the urethane prepolymer added is calculated backward from the foamed cured product, the solid content of the urethane polymer is 1 to 23% by weight based on the foamed cured product (foamed mortar). In order to create the laminate 10 of the present invention,
For example, devices for supplying a moisture-permeable base sheet a, supplying foamed slurry, supplying a moisture-permeable base sheet b, and regulating the thickness are arranged on a series of lines, and two sets of moisture-permeable base sheets are supplied in rolls. On the other hand, foaming slurry 9 includes gypsum 4, blast furnace slag 5, foaming agent 6, and water 7.
etc. quantitatively in batches or continuously.
The slurry is foamed, and the foamed slurry is continuously mixed with the urethane prepolymer 8 in a certain ratio, and the mixture is applied onto the base sheet. Further, the moisture-permeable base sheet b is placed on the foamed slurry 9, the thickness is controlled, and the sheet is dried. Then cut into desired size. FIG. 2 schematically illustrates this manufacturing method. (Function) The laminate of the present invention provides nonflammability that could not be obtained with conventional foamed urethane plates, controls the foaming ratio, and adds urethane resin to achieve lightness and flexibility. (Example) Examples will be described below. As a composition of foamed slurry, 50 parts by weight of gypsum dihydrate, 50 parts by weight of blast furnace slag, 60 parts by weight of water, 0.3 parts by weight of soda citric acid, 1 part by weight of foaming agent, were added and mixed in order according to the above compounding amounts.
Obtain slurry-like material. Furthermore, the specific gravity of the slurry is
Stir with a high speed mixer until it reaches 0.8. Thereafter, 5 parts by weight of urethane prepolymer [trade name: Polygrout W-1 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)] was added and mixed, and aluminum hydroxide-containing paper (trade name: Cosmo (manufactured by Toyo Pulp Co., Ltd.)]
It was applied evenly on top to a thickness of 10 mm, and then the same noncombustible paper was layered on top. It was confirmed that the coating cured 2 minutes after application at room temperature of 25°C. Further, in a similar manner, a laminate according to the present invention was manufactured and used as a specimen for various tests. The results are shown in Table 1. The test and evaluation method is JISA1301 for nonflammability.
Based on the standard, water absorption is evaluated based on the amount of water absorption: 0.1g/cm ³
The following was marked as ○, 0.1 g/cm ³ to 0.3 g/cm ³ as △, and 0.3 g/cm ³ or more as ×. Weight was evaluated based on apparent specific gravity, and less than 0.5 was rated as ○, 0.5 or more and less than 1.0 was △, and 1.0 or more was rated as ×. For flexibility, prepare a board of 50 x 10 cm, and
Items that can be deflected by 1.0 cm or more between fulcrums of cm are marked as ○. Workability was evaluated using the tools necessary for the cutting process, with ○ being acceptable with a knife, △ being acceptable with a wood saw, and × being rated as poor if a special saw blade was required. The test boards compared were urethane foam board (12mm thick),
Foamed gypsum board (12 mm thick) and ALC board (37 mm thick) were used.

[Table] (Effects of the invention) Since the laminate of the invention is flexible, it is less likely to break or chip when handled. Also, since it is non-flammable, it causes less damage in the event of a fire. Moreover, since it is light and easy to process, efficiency during use is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of the present invention. FIG. 2 is a schematic diagram showing an example of the manufacturing method of the present invention. 1...Base material sheet a, 2...Base material sheet b, 3
...Foamed mortar layer, 4...Gypsum, 5...Blast furnace slag, 6...Foaming agent, 7...Water, 8...Urethane prepolymer, 9...Foamed slurry, 10...Laminated body.

Claims (1)

[Scope of utility model registration request] A plate-shaped body whose core material is foamed mortar containing gypsum and blast furnace slag as essential components, where the foamed mortar contains a urethane polymer with a solid content of 1 to 23% and has been mechanically or chemically foamed to an apparent specific gravity of less than 0.5. A laminate characterized in that it is sandwiched between two moisture-permeable base sheets and has a constant thickness.