JP3120264B2 - Floor material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recyclable flooring material having good adhesiveness.

[0002]

2. Description of the Related Art Conventionally, flooring made of vinyl chloride resin has been frequently used for flooring of buildings and condominiums.
However, a floor material made of a vinyl chloride resin generates a large amount of smoke containing toxic hydrogen chloride gas at the time of fire, which has a problem that it has an adverse effect on the human body and hinders evacuation behavior and fire extinguishing activities. In addition, there is also a problem that the odor is strong because it contains a large amount of a plasticizer.

[0003] For this reason, recently, researches on flooring materials containing an inorganic filler as a base material and an olefin resin containing no halogen have been actively conducted, and among them, abrasion resistance, stain resistance, heat resistance, etc. However, a flooring material based on polypropylene, which is relatively good, is considered promising.

[0004]

However, since the floor material made of polypropylene is inferior in adhesiveness, there is a fatal defect that the floor material is easily peeled off even when it is adhered to the floor with an adhesive. As a method of improving the adhesion, for example, it is conceivable to primer-treat the back surface of the flooring material with a solvent such as toluene.
There is a problem that the effect is lost after 6 months. In addition, since solvents such as toluene are toxic to the human body, there is a problem that the working environment at the time of sticking work is deteriorated.
There is also a problem that a device for recovering toluene is required when regenerating the floor material once used.

The present invention has been made in view of the above problems, and has as its object the purpose of having good adhesion and not requiring a primer treatment, even though the main resin of the flooring body is polypropylene. It is to provide a renewable flooring.

[0006]

A flooring material according to the present invention which achieves the above object is a flooring material in which a backside layer is laminated and integrated on the backside of a flooring body, and the flooring body is made of polypropylene 70 to 40.
30 to 60 parts by weight of ethylene-vinyl acetate copolymer resin
The base resin mixed with parts by weight contains an inorganic filler. The back layer has a vinyl acetate content of 45%.
With respect to 100 parts by weight of the ethylene-vinyl acetate copolymer resin having a melt index in the range of 20 to 150,
It is characterized in that it is a layer having a thickness of 0.1 to 0.5 mm containing not more than 10 parts by weight of rosin and 200 to 600 parts by weight of an inorganic filler.

[0007]

In the flooring material of the present invention, since the ethylene-vinyl acetate copolymer resin of the backside layer is highly compatible with the base resin of the flooring body, the backside layer does not peel off from the flooring body, and The ethylene-vinyl acetate copolymer resin of the back layer is
Since the ratio of vinyl acetate is as high as 45% or more and the melt index is in the range of 20 to 150, which is excellent in adhesiveness, even if it is not subjected to a primer treatment with a solvent, various commercially available adhesives for flooring materials ( It can be firmly attached to the floor surface using a rubber-based, vinyl acetate-based, urethane-based, epoxy-based, acrylic-based adhesive, or the like. That is, vinyl acetate
An ethylene-vinyl acetate copolymer resin having a melt index in the range of 20 to 150 containing 5% or more is flexible, has a large amount of polar vinyl acetate, and has an appropriate molecular length, and Because of the high compatibility, the adhesiveness is remarkably improved, and the adhesive can be firmly attached with a commercially available adhesive for flooring materials.

Further, the content of the inorganic filler in the back layer is correlated with the adhesive strength, and the adhesive content tends to increase as the content increases. In this regard, the flooring material of the present invention has a large adhesive strength because it contains a large amount of the inorganic filler in an amount of 200 parts by weight or more with respect to 100 parts by weight of the ethylene-vinyl acetate copolymer resin in the back layer. However, if the content of the inorganic filler is too large, there arises a problem that the back surface layer is weakened. Therefore, the flooring material of the present invention, the content of the inorganic filler of the back layer is 600 parts by weight or less,
In addition, rosin is blended to prevent the back layer from becoming weak.

This rosin acts as a thickener to suppress brittleness due to the inorganic filler, but if its content is too large, the flooring becomes colored and dirty when it is recycled, making it difficult to regenerate. This causes the inconvenience. Therefore, the flooring material of the present invention has a rosin content of 10 parts by weight or less so that it can be regenerated.

[0010]

Embodiments of the present invention will be described below.

FIG. 1 is a cross-sectional view of a floor material according to the present invention, wherein 1 indicates a floor material main body, and 2 indicates a back surface layer laminated and integrated on the back surface of the floor material main body.

The floor material body 1 of this embodiment has a side of 45c.
m is formed into a tile shape, and 70 to 40 parts by weight of polypropylene is mixed with 30 to 60 parts by weight of an ethylene-vinyl acetate copolymer resin to form a base resin. Based on 100 parts by weight of the base resin, It contains 120 to 300 parts by weight of an inorganic filler.

As the polypropylene, those having a melt index of 1 to 10 are preferable, and such a polypropylene has a well-balanced property such as hardness, impact strength and elongation. As the ethylene-vinyl acetate copolymer resin, the ratio of vinyl acetate was 35% by weight.
The following are preferred, and such an ethylene-vinyl acetate copolymer has good stain resistance.

As the inorganic filler to be contained in the floor material main body 1, calcium carbonate, aluminum hydroxide or the like is suitable, and in particular, fine powder having an average particle size of 10 μm or less and having good kneading properties is suitably used. Aluminum hydroxide is an excellent flame retardant that releases water by thermal decomposition.For example, when severe flame retardancy is required such as flooring for vehicles, if mixed with calcium carbonate, Good. The content of aluminum hydroxide is at most up to 100 parts by weight.

The above-mentioned polypropylene and ethylene-
The floor material main body 1 made of a mixture of a vinyl acetate copolymer resin as a base resin is a resin whose main component is polypropylene, which has a surface gloss and is excellent in stain resistance.
Has a glossy surface and has good stain resistance and chemical resistance.
In particular, those obtained by mixing ethylene-vinyl acetate copolymer resin in which the proportion of vinyl acetate occupies 35% by weight or less with polypropylene have extremely good stain resistance. Further, ethylene-vinyl acetate copolymer resin is kneadability with inorganic filler,
Because of the excellent compatibility, the inorganic filler is used in an amount of 120 to 30.
Even if 0 parts by weight is blended, the floor material main body 1 does not become brittle and easily cracked. Moreover, since the ethylene-vinyl acetate copolymer resin has a low degree of crystallinity, the floor material main body 1 hardly deforms and has good dimensional stability.

The floor material body 1 contains more than 70 parts by weight of polypropylene, and 40 parts of ethylene-vinyl acetate copolymer resin.
If the amount is less than the weight part, the floor material main body 1 becomes hard and brittle.
Conversely, if the amount of polypropylene is less than 40 parts by weight and the amount of the ethylene-vinyl acetate copolymer resin is more than 60 parts by weight, the floor material main body 1 becomes flexible and the dent resistance and abrasion resistance are reduced, The stain resistance also decreases. Therefore, as described above, 70 to 40 parts by weight of polypropylene is ethylene-
It is desirable to mix the vinyl acetate copolymer resin at a ratio of 30 to 60 parts by weight.

When the content of the inorganic filler in the floor material body 1 exceeds 300 parts by weight, the flame retardancy is improved, but the floor material body 1 becomes brittle and easily cracked, and the wear resistance is lowered. On the other hand, when the content of the inorganic filler is less than 120 parts by weight, the flame retardancy is greatly reduced, and the composition is easily burnt.
Therefore, the content of the inorganic filler is from 120 to
It is desirable to use 300 parts by weight.

It should be noted that the floor material body 1 may have D
An appropriate amount of a plasticizer such as OP, a peroxide-based crosslinking agent, a lubricant such as bisamide, a phenol-based antioxidant, or a benzophenone-based ultraviolet absorber may be added.

It is desirable that the thickness of the flooring body 1 is about 2.0 to 5.0 mm, but it is not particularly limited.

On the other hand, the back layer 2 is formed by adding 10 parts by weight or less of rosin to 100 parts by weight of the ethylene-vinyl acetate copolymer resin.
It is a layer having a thickness of 0.1 to 0.5 mm containing from 00 to 600 parts by weight of an inorganic filler. The back layer 2 is provided on the back surface of the floor material main body 1 so as to impart excellent adhesiveness and be firmly attached to the floor surface with various commercially available floor adhesives. As the material resin, an ethylene-vinyl acetate copolymer resin having good compatibility with the polypropylene of the floor material main body 1 and various adhesives and excellent adhesiveness, desirably, the vinyl acetate accounts for 45% or more, and Ethylene having an index in the range of 20 to 150;
Use vinyl acetate copolymer resin.

The back layer 2 made of an ethylene-vinyl acetate copolymer resin containing 45% or more of vinyl acetate is flexible and has a large amount of polar vinyl acetate, so that it has good adhesiveness and polyvinyl chloride. It has an adhesive strength equal to or higher than the above. And the melt index is 20 ~
Those having a molecular weight in the range of 150 have an appropriate molecular length and a high compatibility with the adhesive, so that the adhesiveness is particularly good. An ethylene-vinyl acetate copolymer resin having a melt index of less than 20 has poor compatibility with an adhesive due to its long molecule, and its adhesive strength is just one step away. The ethylene-vinyl acetate copolymer resin having a melt index of more than 150 is
Since the molecules are too short, the strength of the back surface layer 2 is reduced, and the layer is easily broken when a peeling force is applied, so that a large adhesive strength cannot be obtained. In addition, since the ethylene-vinyl acetate copolymer resin in which the ratio of vinyl acetate is too large has poor water resistance and alkali resistance, when such an ethylene-vinyl acetate copolymer resin is used, an appropriate amount of polyvinyl alcohol or the like is used. It is desirable to adjust by mixing.

The inorganic filler to be contained in the back layer 2 is the same as the inorganic filler of the floor material main body 1, and in particular, calcium carbonate powder having an average particle size of 10 μm or less and having good kneading properties is suitable. is there. The content of the inorganic filler has a correlation with the adhesive strength, and as the content increases, the adhesive strength of the back surface layer 2 tends to be improved. If the content is less than 200 parts by weight, the adhesive strength is not sufficient, and the back layer 2 shrinks during molding due to too much resin, which may warp the flooring. However, when the content of the inorganic filler exceeds 600 parts by weight, the back surface layer 2 is weakened, so that the bonding strength is reduced. Therefore, it is necessary to include the inorganic filler in the back layer 2 in a proportion of 200 to 600 parts by weight, and particularly when the inorganic filler is contained in the range of 350 to 500 parts by weight, the back layer having excellent adhesive strength and mechanical strength is provided. 2 is desirable.

The rosin contained in the back layer 2 functions as a thickening agent for suppressing the weakening of the back layer 2 due to a large amount of the inorganic filler. However, the mechanical strength also decreases. However, since rosin is a coloring substance, if the content is too large, it becomes colored and dirty at the time of floor material regeneration, making regeneration difficult. Therefore, the content of the rosin is set to 10 parts by weight or less, the weakening of the back surface layer 2 is suppressed, the coloring at the time of reproduction is prevented, and the reproduction is enabled.

As described above, the thickness of the back surface layer 2 is set to 0.
It needs to be 1 to 0.5 mm. When the thickness is less than 0.1 mm, it becomes difficult to provide sufficient adhesive strength,
If the thickness is more than 0.5 mm, there is a possibility that the film may be peeled in the middle of the back surface layer 2 when strongly bonded. The preferable thickness of the back surface layer 2 is 0.2 to 0.4 mm, and the best is around 0.3 mm.

The back layer 2 can contain various additives similar to those of the floor material main body 1.

The floor material having such a configuration is manufactured, for example, by the following method. First, a resin mixture was prepared by mixing an ethylene-vinyl acetate copolymer resin with an inorganic filler and rosin in the ratio described above, and a thickness of 0.1 to 0.5 mm was obtained using this resin mixture.
A film to be the back surface layer of the above is formed. Then, a resin mixture for forming a floor material main body, in which an inorganic filler is mixed with a base resin having polypropylene and ethylene-vinyl acetate as essential components, is prepared and granulated by an extruder. A floor material is obtained by laminating to a certain thickness, gelling by heating, and press-forming with a press or a roll.

As is apparent from the above description, the flooring material of the present invention has excellent adhesion due to the back layer having a specific composition, despite that the flooring material itself contains polypropylene as an essential component. It can be firmly adhered to the floor using various commercially available adhesives without primer treatment with harmful solvents, and it can be regenerated without coloring or dirt. It has a remarkable effect of being useful.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a flooring material of the present invention.

[Explanation of symbols]

 1 Floor material body 2 Back layer

──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 E04F 15/00-15/22

Claims (1)

(57) [Claims] A floor material comprising a back surface layer laminated and integrated on the back surface of a floor material body, wherein the floor material body is made of polypropylene 70-4.
30 to 6 parts by weight of ethylene-vinyl acetate copolymer resin
0 parts by weight of a base resin mixed with an inorganic filler, and the back layer has a vinyl acetate content of 45%.
% Of rosin of less than 10 parts by weight and 200 to 600 parts by weight of an inorganic filler with respect to 100 parts by weight of an ethylene-vinyl acetate copolymer resin having a melt index in the range of 20 to 150. A flooring material having a layer thickness of 1 to 0.5 mm.