JPS5811120A - Surface treatment for urethane resin foamed plate - Google Patents

Abstract

PURPOSE:To enable urethane foamed plate to be laminate-treated with air tight sheet by providing an upper layer with smoothly grinded phenol resin- foamed layer, and a lower layer with phenol resin-foamed layer containing glass fiber on the surface of said urethane resin-foamed plate. CONSTITUTION:Glass fiber unwoven cloth 2 is stuck onto an urethane resin- foamed plate 1. Glass fiber-unwoven cloth 2 is polymalized at half dried condition. After the adhesive is fully dried, foaming phenol resin is painted uniformly and is penetrated into the glass unwoven cloth. Glass unwoven cloth 2 becomes wet condition. The plate 1 is successively passed through 100 deg.C tunnel-furnace, consequently, phenol resin-liquid 3 is foamed and hardened, thereby forming phenol-foamed layer 4 with rough surface in the upper layer and phenol-foamed layer 5 containing glass fiber in the lower layer, on said resin-foamed plate 1. Finally, phenol resin-foamed layer 4 is smoothened by sanding, and general painting finish and laminate-treatment with air tight vinyl chloride sheet etc. is possible to be operated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for surface treatment of a urethane resin foam board, which allows the surface to be subjected to finish coating or lamination with a decorative sheet.

It is obvious that urethane resin foam board is ideal as a building material because it has excellent heat insulation, heat retention, and sound insulation properties, and is also lightweight, but urethane resin foam board is a closed-cell foam with no air permeability at all. Therefore, even if an attempt is made to attach a vinyl chloride resin sheet to its surface, the adhesive will not harden, making it impossible to laminate with a non-air permeable sheet.

The present invention aims to eliminate such drawbacks of the urethane resin foam board and provide a board material ideal as a decorative board for construction, and one embodiment thereof will be described below based on the drawings.

After sanding both the front and back sides of the urethane resin foam board 1 to make it a substantially smooth surface, as shown in Figure 1, the front and back sides are coated with 0.
．． A glass nonwoven fabric 2 with a thickness of 25 mm is attached using an acrylic/ethylene adhesive.

□ In this case, the glass nonwoven fabric 2 is polymerized after volatilizing the solvent of the adhesive to some extent and leaving it in a semi-dry state.

After the adhesive has completely dried, as shown in Fig. 2, the foamable phenolic resin liquid 8 is uniformly applied onto the glass nonwoven fabric 2 on the front side using a flow coater at a coating amount of 80 to (L9/ys'). This is sufficiently permeated into the glass nonwoven fabric 2 to bring the glass nonwoven fabric 2 into a wet state.At this time, the thickness h from the bottom surface of the glass nonwoven fabric 2 to the top surface of the phenol resin liquid 8
t is approximately 0.5vx. Continue this until the furnace temperature is 10
The phenolic resin liquid 8 is passed through a tunnel-type heating furnace at 0° C. for 7 minutes to foam and harden, and as shown in Figure 3, the phenolic resin foam layer 4 having an uneven surface is formed on the upper layer, and glass fiber is mixed on the lower layer. A phenolic resin foam layer 5 is formed.

The thickness h of the entire foam layer including the glass nonwoven fabric 2 at this time
2 is approximately 2.01111. Finally, the upper phenolic resin foam layer 4 is sanded to make the surface smooth. In this case, as shown in FIG. 4, the entire upper foam layer 4 is removed and the lower foam layer 5 (thickness h3 is approximately 0.5
m) is exposed, but there are cases where the upper foam layer 4 is removed to the extent that it is smooth and the lower foam layer 5 is not exposed.

In the above example, the glass nonwoven fabric was attached to the front and back sides of the urethane resin foam board using an adhesive, but it is also possible to overlap the glass nonwoven fabric on the front and back sides when molding the urethane resin foam board and attach it at the same time as the molding.・8 Yes. In order to make the lifting of the glass fibers on the phenol resin foam layer more noticeable, there is also a method in which the fibers of the glass nonwoven fabric are placed in a fluff chamber in advance.

As described above, the surface treatment method for a urethane resin foam board according to the present invention forms an open cell type phenolic resin foam layer on the surface of a single cell type urethane resin foam board, so it is possible to use a general paint finish or a non-porous chloride resin foam layer. It can be laminated with vinyl sheets, etc., and although the phenol resin foam layer forms relatively large irregularities on the surface, it has small bubbles and is soft, so it can be easily smoothed by grinding.

In particular, in the surface treatment method according to the present invention, a phenol resin foam layer is formed on the front nonwoven fabric after glass nonwoven fabrics are attached to the front and back sides of a urethane resin foam board. There is no risk of warping.

In addition, after the foamable phenol resin liquid is completely permeated into the glass nonwoven fabric to make it wet, the resin liquid is foamed. Inside the foam layer (a foam layer with a mixture of glass grains dispersed while floating is formed at the bottom), so by grinding and smoothing the uneven foam layer on the upper layer, the surface of the urethane resin foam board is It is possible to form a tough film with appropriate elasticity.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention. The first figure is a longitudinal cross-sectional view showing a glass nonwoven fabric attached to the front and back sides of a urethane resin foam board, and the second figure is a longitudinal cross-sectional view showing a state in which glass nonwoven fabric is attached to the front and back sides of a urethane resin foam board. FIG. 3 is a vertical cross-sectional view showing a state in which the foamable phenolic resin is applied. FIG. 4 is a vertical cross-sectional view showing a state in which the upper foam layer is ground. l... Urethane resin foam board 2... Glass nonwoven fabric

Claims (1)

[Claims] A glass nonwoven fabric is attached to both the front and back sides of a urethane resin foam board, and a foamable phenolic resin liquid is applied to the glass nonwoven fabric on the front side to moisten the glass nonwoven fabric, and then this is heated to foam the foamable phenolic resin. This method forms an upper phenol resin foam layer and a lower glass fiber-containing phenol resin foam layer on the surface of a urethane resin foam board, and then grinds the upper phenol resin foam layer smoothly. Surface treatment method for boards.