JPS59159865A - Resin composition for tile unit - Google Patents

Abstract

PURPOSE:To provide the titled resin compsn. suitable for use as an adhesive for preparing tile units, containing a specified ethylene/vinyl acetate copolymer powder as the principal component. CONSTITUTION:A powder having a particle size of 2mm. or below obtd. by mechanically crushing an ethlene/vinyl acetate copolymer having a vinyl acetate content of 5-15wt%, a melt index of 30-100 and a Vicat softening point of 60 deg.C or above (ASTM-D-1525) (e.g. Evaflex-J-442, a product of Mitsui Polychemical K.K.) at room temp. is used. A bondable thermoplastic resin such as polyethylene may be used together. Said resin (compsn.) is applied to the surfaces of tiles placed in a frame in such a manner that the surfaces are arranged upward. The resin (compsn.) is then molten by heating and solidified by cooling to prepare a tile unit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin composition for preparing tile units used in the construction of concrete Hfff structures in steam building constructions using precast concrete plates.

Traditionally, the structure of tile units is to attach the tile surface with adhesive to a sheet material such as paper, plywood, synthetic resin board, or rubber molding, and then fix the synthetic resin material as a board joint in the joint area. The shape is known.

However, in order to prepare a tile unit in this way, there are steps such as first applying adhesive to the sheet pillar stones and attaching the tiles, and then forming the board joints. It is labor-intensive, and it is also difficult to remove the adhesive that contaminates the tile surface when removing the sheet after the concrete hardens. The process was complicated and the performance was inadequate.

An improved method is to prepare tiles by arranging the tiles in a mold with their surfaces facing upward, filling them with thermoplastic adhesive resin, heating and melting them, and then cooling and solidifying them. A method has been drafted, and according to this method, the tiles in the formwork are
Compared to the method of placing a fat sheet or foamed resin sheet and heating and melting it, there is no need to mold the sheet according to the shape and size of the mold, no need to press it with an upper oak press, and the processing labor is extremely low. The advantage is that it can be done easily.

However, ethylene-vinyl acetate copolymer (EVA) H
It is supplied in pellet form, and if it were to be filled with pelleted EVA according to the improved method described above, there is a limit to its meltability even if it is heated and melted, so the thickness of the EVA on the tile becomes thick, making it uneconomical. However, in order to prevent holes from appearing here and there and making it smooth, it is possible to fill it with powdered EVA, but in order to powderize standard EVA, it is necessary to use the cryo-pulverization method. Therefore, the above-mentioned improved method has the disadvantage of significantly increasing costs.

However, as a result of our research, the present inventors found that a specific ethylene-vinyl acetate copolymer, as described later, is a thermoplastic resin with adhesive properties used in the above-mentioned improved method. As described above, the specific EVA powder or a thermoplastic resin composition having adhesive properties containing the specific EVA powder as an essential component is used because it can be powdered by pulverization. It is possible to avoid the large cost increase caused by freezing and pulverization, and to prepare tile units that have excellent heat meltability and cooling solidification properties during molding, as well as temporary adhesion and rigidity after molding. Find out,
The present invention has now been completed.

That is, in the present invention, as essential components, the vinyl acetate content (hereinafter abbreviated as VA amount) is 5 to 15% by weight, and the melt index (hereinafter abbreviated as MI) is 60 to 15% by weight.
100 and a VICAT softening point of 60° C. in accordance with ASTM D-1575. It is something to do.

Here, the ethylene-vinyl acetate copolymer powder has a VA content of 5 to 15% and an MI of 60 to 1.
00 and has a Vicat il=& temperature of 60° C. or higher.

When using unvortexed EVA with the above VA amount of 5wt%, there is no temporary adhesion and it is too rigid, making it difficult to peel off after the concrete IJ hardens, and conversely, the VA amount is 15wt%. If you use a material exceeding V, it will be difficult to mechanically grind at room temperature.
AN should be up to 15% of heavy assets.

In addition, the amount of VA is 5 to 15% of that of
EVA powder with an MI of less than 60 tends to have poor thermal meltability during molding, resulting in insufficient product shape and adhesive strength, while EVA powder with an MI of more than 100 cannot be mechanically pulverized at room temperature and has a low tensile strength. If it is too high, it becomes difficult to peel off the concrete after it hardens, which is not preferable.

Furthermore, the VA amount is 5 to 15% by weight, and the MI is 30 to 30%.
100, the Vicat softening point is less than 60°C
/VA is not preferable because mechanical pulverization at room temperature becomes impossible.

To prepare the tile units, specific E
Of course, the purpose of the present invention can be fully achieved with VA powder itself, but it is also possible to use polyethylene, carbon propylene, polystyrene powder, etc.
Of course, it can also be used in a form containing a thermoplastic resin having adhesive properties such as other general-purpose EVA.

In addition, if necessary, tackifiers such as terpene-based or petroleum resin-based tackifiers, foaming agents, or fillers may be added to the composition of the present invention to improve the thermal meltability and adhesive strength of the composition of the present invention. You may also make it one layer or two.

The thus obtained resin composition for preparing a tile unit of the present invention is particularly suitable for arranging tiles in a mold with the tile surface facing upward, as described above, and then forming a thermoplastic resin composition that is in contact with tiles, etc. Although it is suitable for the method of preparing a tile unit, in which the resin is filled with a resin 4 having a traveling property, and then heated and then the fat is melted and the tiles are temporarily bonded, the method is simultaneously cooled and solidified. without limitation. For example, in the resin filling process described in -F, the composition of the present invention is applied not only to the entire surface of the formwork, that is, to both the tile surface and the joint frame, but also to the joint area only. Filling with a resin other than the inventive composition, for example, pelletized EVA,
E V that has been pre-formed into the joint shape only at the joint area.
It is also possible to fill A and then fill it with the composition of the present invention, and as long as the specific EVA powder mentioned above is used as one of the resins, it is not included in the present invention. 2. I want to be understood.

Here, the specific EVA powder, which is an essential component of the composition of the present invention, must have a particle size that does not cause the undesirable disturbance of the product shape caused by the pelleted EVA used in the conventional method. Good, usually 2+
+tm diameter or less, preferably 20 mesh or less, is suitable.

Next, the present invention will be explained in detail with reference to Examples, in which all percentages are by weight unless otherwise specified.Example 1 A formwork with a length of 420 mm and a width of 580 mm was used. The vertical and horizontal joint widths were 8 mm and 10 mm, respectively, and the joint depth was 4 mm. Rubber joint frames were installed, and then inside each of these joint frames, a "brick quill old T"
-60 pieces of -11J [light ceramic tiles (fabricated porcelain tiles)] were arranged so that their surfaces faced in one direction.

Then, on the surface of these tiles and part of the joints, a material with a VA of 1D%, an M'I of 70, and a Vicat softening point of 65°C is applied so that the thickness at the tile surface is 4 mm.
Naru [Evaflex J-411 [Mitsui Polychemical!
EVA of Fu4] was pulverized in a room-temperature machine and filled with a powder having a diameter of 2, and the powders were made to have a uniform height.

Next, the mold was heated to 19'0'C for 20 minutes to melt the resin, and then cooled and solidified, and then removed from the mold to examine the tile unit.

The tile unit obtained here can be easily melted by heat during its manufacture, quickly cooled and assimilated, and can be demolded easily.
However, it was also found that peeling of the hardened concrete was extremely easy.

Example 2 Tiles were arranged in the same manner as in Example 1 using the same mold, rubber joint frame 2, and tiles, and then pellet-shaped "Sumitate KA-31jC Sumitomo Chemical Co., Ltd. (( EVA; VA + 1 = 28%, MI = 7, Vicat softening point = 68°C] was then filled onto the tile surface (((is, [Sumitate DB-10JC manufactured by the same company) EV A ; VA Feng - = 10%, MI =
70, Vicat softening point = 65°C] was mechanically pulverized at room temperature to a powder of 20 to 100 meshes, and 10% of the ladle powder of ``Marukarenz T-100Al [Maruzen Sekiyu (Kiyuki-made oil 1 fat)] was mixed. It was filled in a single layer with a thickness of 2 cm (C uniform height).

Next, this mold was heated to 170″CX3 under heating conditions.
A tile unit was obtained in the same manner as in Example 1 except that the time was changed to 0 minutes.

The tile unit obtained here was easy to heat and melt during production, had excellent temporary adhesion, and had moderate rigidity, so it was extremely easy to peel off after concrete hardened.

Agent: Patent Attorney Katsutoshi Takahashi

Claims (1)

[Claims] As an essential component, vinyl acetate content is 5-15% by weight
A resin composition for preparing tile knit, comprising a powdered ethylene-vinyl acetate copolymer having a melt index of 60 to 100 and a Picat softening point of 60° C. or higher.