JPS5824060A - Cushion floor material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cushioned flooring material having a foam layer, and more particularly to a cushioned flooring material with improved residual dent resistance.

BACKGROUND OF THE INVENTION Flooring materials that use soft foam as a backing material or intermediate layer to improve the feeling of walking have been known. Furthermore, in recent years, noise generated or propagated from stairs, hallways, and floors above floors has become a problem in mid-to-high-rise housing, and flooring materials with foam layers have come to be used to prevent or alleviate floor impact noise.

However, such flooring materials have poor residual dent resistance, and are difficult to recover from dents when placed on furniture such as beds, desks, and chairs, especially when heavy objects are placed on them, or when objects with sharp edges such as high heels are placed on them. Unfortunately, the surface of the flooring material is left with residual dents due to pressure and irregular unevenness, which significantly impairs the aesthetic appearance and shortens the life of the product.

The inventors of the present invention have conducted extensive studies aimed at solving the above drawbacks, and have devised various techniques for the non-foamed resin surface layer laminated on top of the foamed layer. For example, the surface layer has a two-layer structure, and each layer An experiment was conducted to change the hardness of As a result, it has been found that when the non-foamed resin surface layer has a two-layer structure consisting of an upper layer and a lower layer that is softer in a specific range than the upper layer, extremely excellent residual dent resistance can be obtained.

That is, the present invention provides a flooring material composed of a non-foamed resin surface layer and a foamed layer, in which the non-foamed resin surface layer has an upper layer having a McBurnie dent value of 0.4 to 0.6, and a floor material having a McBurney dent value of 0.4 to 0.6 from the upper layer. The present invention relates to a cushioning floor material characterized by being laminated with a softer lower layer having a value of 0.1 to 0.4 NIl.

In the present invention, by combining an upper layer having a certain dent value and a lower layer that is softer than this, as is clear from the comparative examples shown later, it is generally expected that the residual dent resistance will be better. This effect is better than when using a surface layer consisting of an upper layer and a lower layer, both of which are relatively hard. That is, the present invention has been able to achieve unexpected and remarkable effects by employing a two-layer non-foamed resin surface layer having a specific structure that is contrary to common knowledge as described above.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a cross-sectional view of the cushioning flooring material of the present invention, showing the upper layer.

The foam layer (1) is preferably a foam made of polyvinyl chloride (hereinafter also referred to as PvC), polyurethane, or the like.

It is preferable that the foam has appropriate softness and flexibility in consideration of walking feeling and sound insulation properties. In the case of PVC, a paste method is suitable, but calendering is also possible. As for the foaming method, it is possible to add a foaming agent or to perform mechanical foaming.

For 100 parts of resin (parts by weight, the same applies hereinafter) in the foam layer,
About 10 to 100 parts of filler are used, preferably about 20 to 80 parts, and the expansion ratio is usually up to about 3 times, preferably about 1.5.
~2.5 times is better, and the thickness of the foam layer is approximately 1.5~
5fl is preferred. Note that in addition to plasticizers, fillers, and blowing agents, surfactants, viscosity modifiers, and the like can also be added to VC. In the case of a PVC sheet, it is preferable to finally obtain a foam layer by heating at about 180 to 240°C for about 5 minutes. Further, by interposing a glass mat, glass cloth, polyester nonwoven fabric, or other fibrous material in the foam layer, dimensional stability can be improved.

The non-foamed resin surface layer is a laminate of PlusDeck sheets consisting of upper and lower layers, both of which are suitably manufactured from vinyl chloride resin. As vinyl chloride resin, PVC homopolymer,
Copolymers of vinyl chloride and vinyl acetate, ethylene, propylene, acrylic acid, methacrylic acid, esters thereof, etc. are used. The present invention is characterized in that the upper layer has a fin muckburney dent value of 0.4 to 0.6 cod, and the lower layer has a 0.1 to 0.4 fin muckburny dent value larger than that of the upper layer. That is, the upper layer (3) has a higher hardness than the lower layer (2). The dent value of Matsukuba 121 of the present invention is J
This is required in accordance with IS A3707.

That is, a 2N thick sample is placed on a polished plate glass with one side of the test piece facing up. After leaving the sample in a constant temperature bath adjusted to 20° C. for 15 minutes, a testing machine previously maintained at the same temperature is placed on the sample. A steel rod with a hemispherical tip was used to hold a cod with a diameter of 6.35mm. After adding f, set the dial gauge of the testing machine to 0 point within 5 seconds, totaling 13.6K.
Apply a load of ff, and read the dent value 1 minute after applying the load.

In the surface layer of the present invention, the method for forming the sheets of the upper and lower layers may be an extrusion method, a calendering method, or a combination of both. The upper and lower sheets may be laminated by adhesive or thermocompression bonding.

The upper layer (3) usually contains 0 to 1 filler per 100 parts of resin.
It is preferable to add 00 parts of resin, and the lower layer (2) contains 10 parts of resin.
Preferably, 0 to 250 parts of filler are added to 0 parts. The hardness of both the upper and lower layers is preferably adjusted by the amount of plasticizer, and the thickness of each upper and lower layer is preferably about 0.3 to 2 U.
The ratio of the thickness of the upper layer to the lower layer is preferably 1:5 to 3:1.

In the above, fillers include calcium carbonate, talc,
Clay etc. can be used, and calcium carbonate is particularly preferred.

Plasticizers generally include di(2-ethylhexyl) phthalate (1) OP), di-n-octyl phthalate (Dn
OP), diheptyl phthalate (DHP), butylbenzyl phthalate (BBP), etc., but tricresyl phosphate (TCP),
Flame retardant plasticizers such as salt-accumulated paraffin, di(2-ethylhexyl)adipate (D
OA), di(2-ethylhexyl) sebacate (1)Q
Cold-resistant plasticizers such as 3) can also be used. In addition, other additives such as lubricants, stabilizers, pigments, etc. can also be blended as appropriate.

In the present invention, a non-foamed lower layer (2) and an upper layer (3) may be sequentially laminated on the foamed layer (1), or a non-foamed resin surface layer obtained by laminating both the upper and lower layers may be bonded to the foamed layer. It's okay. In addition, in the flooring material of the present invention, in addition to woven fabrics such as jute,
A nonwoven fabric or PVC film may be used as a backing material and provided on the lower surface of the foam layer.

In the present invention, as described above, the non-foamed resin surface layer is formed into an upper layer which has a dent value of 0.4 to 0.6 by the Matsubaney method, and an upper layer which has a dent value of 0.1 by the Matsubaney method. In the case of a single surface layer, the upper layer is made harder and the lower layer is made softer, and both layers are laminated with a foam layer. Alternatively, it is possible to obtain better residual dent resistance than when both the upper layer and the lower layer are made hard, achieving an unexpected effect that is contrary to expectations.

The cushioning flooring material of the present invention has excellent residual dent resistance as described above, and is also excellent in workability, walking feel, and sound insulation effect.

Examples of the present invention will be described below.

Example 1 The following formulations were used for the two surface layers, the lower layer, and the foam layer.

(1) Upper layer PVC (P-800) 100iI
(f slide part DOP
32” stabilizer 3
...Calcium carbonate 40〃(2)
Lower layer PVC (P-=800) 100 parts by weight DOP 4
3 〃Stabilizer 3 〃Calcium carbonate 40 〃(3) PVC for foam layer paste (P=950) 67 parts by weight PVC for Hestobu L/7) (Pm2O3)
33 〃DOP
6o Stabilizer
1 Foaming agent (azodicarbonamide)
0.7〃Calcium carbonate 20〃A foamable synthetic resin layer composition shown in (3) is coated on the release paper to a thickness of about 1.39 m, and a base fabric subjected to subbing treatment is laminated on top of the foamable synthetic resin layer composition shown in (3). , to form a foam with a thickness of 2.5 in a foaming furnace at 200 to 220°C (in this case, the foaming ratio is 1.
(based on 8x). Peel off the foam from the release paper (2
) is laminated to a thickness of 0.55 am, and on its surface, two layers shown in (1) are laminated to a thickness of 0.45 txtg, both by thermocompression bonding. Table 1 shows the McBurnie dent values and residual dent values on the upper and lower surfaces of the surface layer of the obtained flooring material.

The residual dent value is calculated after the test piece has been left in the test chamber for more than 1 hour.
．． 1 load of 361ff with a flat steel rod with a 5fl tip
This is the value obtained by applying the pressure for 0 minutes, then removing the weight and 60 minutes after that, the indentation was determined.

Example 2 A flooring material of the present invention was obtained in the same manner as in Example 1, except that the upper and lower layers having the blending ratios shown in Table 1 were used.

The results are shown in Table 1.

Comparative Examples 1 to 6 Comparative flooring materials were obtained in the same manner as in Example 1 except that upper and lower layers having various Matsukuba 121 dent values were used with various compounding ratios as shown in Table 1. Ta. Results first
Shown in the table.

As is clear from Table 1, the flooring of the present invention has superior residual dent resistance compared to the flooring in which both the upper and lower layers are soft (Comparative Examples 2 and 5), which is unexpected. On the other hand, even when compared to flooring materials in which both the upper and lower layers are hard (Comparative Examples 1 and 4), its residual dent resistance is excellent,
This is unexpected. Good results were also obtained in Example 2, in which a much larger amount of filler was used than in Example 1. Regardless of the amount of filler, the non-foamed sheet could be made to have a specified hardness by adjusting the amount of plasticizer. The effect of the invention is achieved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the cushioning flooring material of the present invention, (1)
(2) is the lower layer of the non-foamed surface layer, and (3) is the upper layer thereof. (above) Patent applicant: Toyo Linoleum Co., Ltd. Sumire Kogyo

Claims (1)

[Claims] (1) In a flooring material composed of a non-foamed resin surface layer and a foamed layer, the non-foamed resin surface layer has an upper layer having a matsuburney dent value of 0.4 to 0.6■, and a matsuburney dent value from the upper layer. A cushioning floor material characterized by being laminated with a softer lower layer having a 0.1 to 0.4 ff larger value.