JPH0236362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold that can be used many times without applying a mold release agent.

As a conventional technique, Japanese Patent Publication No. 45-23385 and Japanese Patent Publication No. 45-23386 disclose a method in which parchment paper is pasted on the surface of a mold via a thermosetting resin adhesive, and paraffin or silicone is added thereto. A technology for forming molds coated with a resin paint and cured is disclosed.

The above technology protects the plywood with parchment paper and coats the plywood with paraffin or silicone-containing resin to improve mold releasability. The problem with resin is that it has poor adhesion and is easily peeled off from parchment paper due to impact or friction during concrete pouring.

In addition, the above-mentioned conventional technology involves bonding parchment paper to plywood using a thermosetting resin adhesive;
The technique of applying resin with a hydrophobic material added to parchment paper is simply a combination of the technique of applying resin to a solid object, and is an unhardened or uncured resin with a hydrophobic material added to the unhardened or uncured resin. This is not a technology that laminates and fixes resin.

The object of the present invention is to solve the above-mentioned problems and to provide a formwork in which the resin layer containing a water-repellent agent does not easily peel off even after repeated use.

The formwork of the present invention that achieves the above object is provided with a synthetic resin or synthetic rubber adhesive layer on the surface of the formwork base material, and by removing the solidification or hardening of the adhesive layer, a synthetic resin containing a water repellent agent is applied. It is characterized by laminating unsolidified or uncured surface layers of resin thread or synthetic rubber and solidifying or hardening them integrally.

The present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 shows an adhesive layer 2 formed by applying an acrylic resin emulsion mixed with an aqueous solution of methylcellulose to the surface of a plywood (form base material) 1, and the emulsion becomes adhesive after a certain amount of water evaporates. When is large, Poron C (water repellent manufactured by Shin-Etsu Chemical Co., Ltd.)
The surface layer 3 is formed by applying an acrylic resin emulsion mixed with the above, dried and solidified, and then heated and welded to remove water, or by heating to solidify and welded by removing water. The integrated formwork 4 is shown.

Figure 2 shows a polystyrene foam board (form base material) 1', which has an uneven pattern formed on its surface by using a mold or by heating, etc., on the surface of plywood 1. A vinyl acetate resin emulsion mixed with an aqueous methyl cellulose solution is applied to the surface of the adhesive layer 2, and when the water in the emulsion evaporates to a certain extent and the adhesive strength is strong, the adhesive layer 2 is applied. A mold 4' is shown in which a surface layer 3 is provided by applying a vinyl acetate resin emulsion mixed with Poron C, which is dried and solidified to be integrated.

FIG. 3 shows the formworks 4, 4' arranged with their water-repellent surface layers facing each other, and the ready-mixed concrete 5 poured into the formworks 4, 4' after the ready-mixed concrete 5 has hardened. By removing ``, a concrete body with an uneven pattern formed on one side is obtained.

In this invention, a metal plate, a synthetic resin plate, or the like can be used as the formwork base material. The adhesive layer can be made of an emulsion type, a solvent type, or a molten synthetic resin or synthetic rubber type, and the surface layer can be made of an oil-based silicone resin type, stearate salt, etc. in addition to the above synthetic resin or synthetic rubber type. You can use one with water repellent added. When an emulsion is used in the resin system, an appropriate amount of a hydraulic substance such as cement or gypsum may be added within a range that does not impair adhesive strength and water impermeability.

When unsolidified or uncured resin with a water repellent added is applied directly to a solid object, it tends to peel off due to the action of the water repellent, but the formwork of the present invention has an adhesive layer, that is, an uncured resin, on the surface of the formwork base material. A solidified or uncured resin (or rubber) layer is provided, and a surface layer, that is, an uncured or uncured resin (or rubber) layer containing a water repellent is laminated after the solidification or hardening. Molecules or fine particles move at the interface between the layer and the surface layer, become mixed together, solidify or harden, and are less likely to cause delamination, and the surface layer contains a water repellent, so even if it gets scratched a little. , it has the effect of being able to be used repeatedly without applying a mold release agent.

[Brief explanation of drawings]

FIGS. 1 and 2 are partially enlarged cross-sectional views of two examples of formwork, and FIG. 3 is a cross-sectional view showing the state of pouring ready-mixed concrete using the formwork.

Claims (1)

[Claims] 1. A synthetic resin-based or synthetic rubber-based adhesive layer is provided on the surface of the formwork base material, and the unsolidified or unsolidified synthetic resin-based or synthetic rubber-based adhesive layer containing a water-repellent agent is applied after solidification or hardening. A formwork characterized by laminating hardened surface layers and integrally solidifying or hardening them.