JPH1043613A - Surface material for experimental table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of warpage of a surface material for an experimental table by forming an internal coating film layer formed by applying and curing a thermosetting resin and a surface coating film layer formed by applying and baking alkali silicate are formed on the surface of a decorative cement plate, and a coating film layer of the same shrinkage percentage as that of the surface coating film layer is formed on the back. SOLUTION: A surface material for an experimental table, in which a decorative cement plate is used on a cement plate incorporated with a reinforcing backing, when incorporated into the table, is assembled by a method in which the table is stuck to a flash structure 3 etc., using an adhesive and by other methods. In the production of the decorative cement plate, on both sides of the cement plate incorporated with a reinforcing backing, a semi-cured acryl-modified epoxy resin is dissolved in water, a coating film for an internal coating film layer is formed on the surface, and a coating film for a coating film layer is formed on the back. Next, after these coating films being dried, the coating film of the surface is coated with an alkali silicate type coating to form a surface coating film, and then the surface coating film layer is baked by heating, and semi-cured resin coating film layers on the surface and the back are reaction-cured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface material for a laboratory bench.

[0002]

2. Description of the Related Art As a surface material for a laboratory bench, 3
A decorative cement board is used in which a paint is applied, cured or baked on a cement board containing a reinforcing base material having a thickness of about 6 mm. When the surface material 1 for a laboratory bench is incorporated in a laboratory bench, as shown in FIG. 1, it is combined with a relatively lightweight and strong material such as a plywood or a wooden flash structure 3 by using an adhesive or the like. The cross section is fitted with the frame 2 and finished in a top plate which is a structure having a total thickness of 30 to 50 mm. By adopting such a structure, it is preferable in terms of strength and visual perception when used as an experimental table. As a method for improving the chemical resistance and coating film adhesion of a decorative cement plate, a penetration layer of a thermosetting resin or a penetration layer and an internal coating layer are provided on the surface portion of the cement plate, and an alkali silicate-based coating is formed thereon. Can be solved with a decorative cement board having a surface coating layer coated and baked, but this decorative cement board has a concave coating surface due to the curing shrinkage of the thermosetting resin and the baking shrinkage of the alkali silicate paint. It has a sled. When the decorative cement board with this warp is bonded using plywood, flash and adhesive, press molding is performed in a smooth state in order to adhere the adherend, but at this time, the decorative cement board can withstand the warp correction. In addition, the top plate which had been cracked, the adhesive was partially peeled off, and the structural top plate was warped due to strain, making it difficult to use as a laboratory bench top plate.

[0003]

[Means for Solving the Problems] The present invention provides an internal coating layer in which a thermosetting resin is applied and cured on the surface of a decorative cement board, and an alkali coating on the layer to suppress the occurrence of warpage. A surface coating layer on which silicate was applied and baked was provided, and a coating layer having a contraction rate equal to or close to the contraction rate of the surface coating layer was provided on the back surface. As a method of providing a coating layer on the front and back surfaces of the cement plate, a coating film can be formed by a roll coater, a bristle coating, a flow coater, an airless spray, or the like. As a thermosetting resin used for the internal coating layer, an acrylic modified epoxy resin is water-soluble and has excellent adhesion to an alkali silicate, and thus is preferable. It is preferable that the thickness A of the inner coating layer on the front side and the thickness B of the coating layer on the back side be substantially the same, since warpage is reduced. However, any thickness can be used as long as it can be bonded and bonded to a flash plate. The ratio of the thickness A of the inner coating layer on the front side to the thickness B of the coating layer on the back side, that is, A / B is 0.2 to 2.
If it is in the range of 0, the warp of the obtained decorative cement board is
It is within 10mm per 1m, and there is no crack and no partial peeling of the decorative cement board when bonded with the flash board, and the warp on the top board of the structure that is bonded with the flash board is also within 1.5mm per m. Thus, it is preferable as a surface material for a laboratory bench. When A / B is 0.2 or less, the warp of the decorative cement board is 1
More than 10 mm per m, cracks and partial peeling off occurred, and the warp on the top plate became 1.5 mm or more per m,
Conversely, if the A / B is 2.0 or more, the warp of the decorative cement board will be more than 10 mm / m with the surface painted surface convex, causing cracks and partial peeling off, and the warp on the top plate will be 1.5 mm / m or more. Becomes It is not preferable as a surface material for a laboratory bench.

[0004]

Examples 1 to 5 A semi-cured acrylic modified epoxy resin (50% acrylic component) was applied to the front and back surfaces of a cement board containing a reinforcing base material (product number NC-AH manufactured by Nikko Kasei Co., Ltd.).
(Epoxy component 50%) is dissolved in water to form a coating film for the inner coating layer on the front surface, and a coating film for the coating layer on the back surface. An alkali silicate coating (product number RST-501, manufactured by SK Chemicals Co., Ltd.) is applied by airless spray coating on the coating film for the inner coating layer to form a surface coating film having a thickness of about 50 μm. The whole is heated at 230 ° C. for one hour to bake the surface coating layer, and the semi-cured resin coating layers on the front and back are reaction-cured, and the thickness and coating of the internal coating layer shown in Table 1 are obtained. The decorative cement boards of Examples 1 to 5 having the thickness of the membrane layer were obtained.
Table 1 shows the warpage of these decorative cement boards, the bonded state of the flash boards bonded and bonded using these decorative cement boards, and the warp of the top plate with the flash boards bonded and bonded.

[0005]

Comparative Examples 1 to 3 Comparative examples shown in Table 1 show the thickness of the inner coating layer (modified acrylic resin) formed on the surface of the cement board containing the reinforcing base material and the thickness of the coated acrylic layer formed on the back surface. The procedure was the same as in Example 1 except that the values shown in columns 1 to 3 were used.

[0006]

[Table 1]

[0007]

The surface material for a laboratory bench according to the present invention is an inner coating layer obtained by reacting and curing a thermosetting resin on the surface of a cement board containing a reinforcing base material, and an alkali silicate-based surface coating layer baked thereon. By providing a layer and providing a coating layer having a contraction rate equal to or close to the contraction rate of the front surface coating layer on the back surface, there is an effect that warpage can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of a main part illustrating a structure of a top plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface material 2 Frame board 3 Flash structure

Claims (3)

[Claims] 1. A surface material for a laboratory bench, which is painted and coated on a cement board containing a reinforcing base material, and has a semi-cured thermosetting resin applied and cured on a practically used surface. Layer and a surface coating layer obtained by applying and baking an alkali silicate paint on the inner coating layer, and a coating layer having the same or close shrinkage ratio to the shrinkage of the surface coating layer on the back surface. A surface material for a laboratory bench, comprising: 2. The coating film layer on the back surface has a coating film layer of the same or different resin as the coating film layer on the front surface.
Surface material for laboratory bench as described. 3. The coating layer on the back surface and the internal coating layer on the front surface are made of a thermosetting resin having the same component, and the ratio A / A of the thickness A of the internal coating layer on the front surface and the thickness B of the coating layer on the rear surface is B is 0.2-2.
The surface material for a laboratory bench according to claim 1, wherein the surface material is in a range of 0.