JPH02301434A - Flame-retardant floor covering material - Google Patents

Abstract

PURPOSE:To bring the flame retardant characteristics of the floor covering material concerned into full play and eliminate the fear of the generation of toxic gas at the outbreak of emergency fire and also give wear resistance, which is normally required for floor covering material, to the material by a structure wherein an upper layer made of olefin-based polymeric resin is provided onto a lower layer, which is prepared by adding inorganic flame retarder to olefin-based polymeric resin. CONSTITUTION:Wear resistant olefin-based polymeric resin as an upper layer is laminated to a lower layer, which is prepared by adding 30-300 pts.wt. of aluminum hydroxide, magnesium hydroxide, calcium hydroxide, zinc borate, borax, calcium carbonate, antimony oxide or the like to 100 pts.wt. of olefin- based polymeric resin. There is no limitation for the thickness of the upper layer and lower layer of the floor covering material concerned. Practically, the upper layer part is 0.1-1mm in thickness, the lower layer part 1-4.8mm and preferably the upper layer part is about 0.2-0.5mm in thickness, the lower layer part about 1.5-2.8mm.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a novel flame-retardant flooring material that is flame-retardant and has no risk of generating toxic gas even in the event of a fire. It is something.

[Background Art] With the recent concentration of population in cities, there has been a noticeable tendency for residential spaces to become higher-rise or denser.

As has been reported from time to time, if a fire were to break out in such densely packed or high-rise housing, there is a risk of serious damage.

Moreover, many of the materials that have recently been used as building materials or interior decoration materials are mainly composed of flammable polyolefin materials, and halogen-based compounds are mixed into them to make them flame-retardant in the event of a fire. Consideration has begun to be given to making so-called combustible materials by combining them with polymeric resins.

However, although such halogen-containing compositions exhibit sufficient flammability properties, the halogen-based gases generated are often toxic, such as hydrogen chloride; Since a large amount of smoke is generated, visibility becomes poor, hindering evacuation actions and firefighting efforts in the event of a fire, and there is even a risk of secondary disasters due to the poisonous gas having an adverse effect on the human body.

On the other hand, a surprising number of fires in residential areas are ignited from the floor, such as from floor-standing stoves or sleeping cigarettes, and it is possible that fires can be prevented by making the flooring material flame-retardant. It is being reconsidered.

In order to make the flooring material flame retardant in this way, inorganic flame retardants such as aluminum hydroxide and magnesium hydroxide are mixed in instead of the dangerous halogen compounds mentioned above, and emphasis is placed on safety in the event of a fire. Attempts to use flame-retardant compositions have been proposed and are attracting attention.

[Invention or problem to be solved] The flame retardant composition containing the above-mentioned inorganic flame retardant utilizes the endothermic action of the hydroxide when it releases crystal water in the event of a fire as a flame retardant effect. , has very little fuming, toxicity or corrosiveness.

However, since inorganic flame retardants have a small flame retardant effect,
In order to impart a high degree of flame retardancy, it is necessary to add a large amount of inorganic flame retardant, which not only reduces processability but also reduces the dispersibility of the inorganic flame retardant itself in the polymer resin. As a result, there was a problem in that the wear resistance, which is one of the characteristics required for flooring materials, deteriorated, and this was one of the major obstacles in development.

It is an object of the present invention to eliminate the problems associated with the prior art as described above, to exhibit sufficient flammability characteristics, to eliminate the risk of generating toxic gas in the event of a fire, and to provide a material that is commonly used as flooring material. The present invention aims to provide a new combustible flooring material that can also have the required abrasion resistance.

[Means for Solving the Problems] The present invention provides a lower layer comprising 100 parts by weight of an olefinic polymer resin containing 30 to 300 parts by weight of an inorganic flame retardant, and a layer made of an olefinic polymer resin on top of the lower layer. It has an upper layer.

The inorganic flame retardant to be added to the lower layer is not particularly limited, but in view of the above-mentioned flame retardant effect based on heat absorption, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, and Examples include acid zinc, sand, calcium carbonate, and antimony oxide. The amount to be blended is preferably 30 to 300 parts by weight.

If it is less than 30 parts by weight, a sufficient flame retardant effect cannot be obtained;
If it exceeds 0 parts by weight, it is not preferable because physical properties and moldability deteriorate.

In the present invention, examples of the olefinic polymer resin that serves as the base material constituting the lower layer and the upper layer include polyethylene, polypropylene, poly-4-methyl-1-pentene, ethylene/propylene copolymer, and ethylene/4-methyl-1-pentene. Pentene copolymer, ethylene/butadiene copolymer, ethylene/propylene/diene terpolymer, ethylene/
#Acid vinyl copolymer, ethylene/acrylic acid copolymer,
Examples include ethylene/methyl acrylate copolymer, olefin thermoplastic elastomer, etc., and these can be used alone or in combination of two or more types.

Furthermore, if necessary, processing aids such as softeners and lubricants, foaming agents, vulcanizing agents, antistatic agents, etc. may be added.

In addition, the thickness of the upper layer and lower layer of this flooring material is not particularly limited, but practically, the thickness of the upper layer is 0.1 to 1 as, and the lower layer is 1 to 4.73 as, preferably 0.2 as of the upper layer. ~
Approximately 0.5 fins and 1.5 to 2.8 i of the lower layer are appropriate.

[Function] Even if a wear-resistant olefin polymer resin is used as the upper layer, if a resin containing a flame retardant with high self-extinguishing properties is laminated as the lower layer, the spread of fire in the upper layer can be prevented by the presence of the lower layer. [Examples] The present invention will be described below with reference to Examples.

As shown in the figure, a sheet consisting of upper layer 1 and lower layer 2 was prepared, and an evaluation test was conducted for each property shown in the lower column of Tables 1 to 3.6 Each component of the material for upper layer 1 and lower layer 2 was As shown in Tables 1 to 3, these ingredients were kneaded using a 6-inch test roll and heated at 150°C x 5! 150 mm (width) x 200 mm (length) by tin press molding
A laminated sheet of X2 size (thickness) was formed, and the thickness of the upper layer 1 was 0.21 mm, and the thickness of the lower layer 2 was 1.8 mm.

Abrasion properties were measured using a taper abrasion tester.
The self-extinguishing property was determined by measuring the thickness reduction of the seat after 1,000 rotations using a worn wheel H-22 and a load of 750 g on one arm.
6745, and those that self-extinguished are marked with an ○, and those that exhibit fire spread are marked with an X.

In addition, in the halogen gas generation test, combustion gas was collected with a 2N aqueous sodium hydroxide solution, and a silver nitrate solution was added to collect the combustion gas.
From the evaluation results shown in Tables 1 to 3, the following can be said.

(1) Comparative Examples 1 to 3 and 9 to
As shown in No. 11, there is no self-extinguishing ability.
As shown in Nos. 2 to 14, the thickness reduction due to abrasion was large and it was found that the materials were not preferred as flooring materials.

(3) Comparative Examples 7, 8, and 15°16, in which flame retardants were added at 300 parts or more of indigo as stipulated by the present invention, had poor processability and could not be processed into flooring materials as sheets. be.

(4) It can be seen that in comparison piq17 to piq19 using polyvinyl chloride (PVC) as the polymer resin, a large amount of toxic halogen gas is generated during combustion.

(5) Examples 1 to 1 according to the present invention, in which no flame retardant was added to the upper layer 1, and a flame retardant was added to the lower layer 2 in the range of 30 to 300 parts by weight, which is the range specified by the present invention.
It can be clearly seen that all of No. 10 have excellent self-extinguishing properties, and the thickness loss due to abrasion is also extremely small, which makes them desirable properties as flooring materials.

[Effects of the Invention] As described above, according to the present invention, not only is the flooring material excellent in resistance to damage, but even in the unlikely event of a fire, no toxic gas is generated, and the flooring material in residential areas can be used as a flooring material. It is possible to supply materials that are extremely useful as materials.

[Brief explanation of the drawing]

The figure is a sectional view showing an example of the flooring material according to the present invention. 1: Upper layer, 2: Lower layer.

Claims (1)

[Claims] (1) A flame-retardant floor made by laminating a lower layer made of 100 parts by weight of olefinic polymer resin and 30 to 300 parts by weight of an inorganic flame retardant, and an upper layer made of olefinic polymer resin laminated thereon. Material.