JPH0818418B2 - Soundproof flooring - Google Patents

Description

TECHNICAL FIELD The present invention relates to a soundproof flooring material, and more particularly to a wood flooring material having excellent soundproofing properties and resistance to moisture.

[Problems to be Solved by Prior Art and Invention]

Heretofore, a composition comprising a polyether polyol compound, a polyisocyanate compound and asphalt has been known, and it is also known to utilize this composition as a floor material (Japanese Patent Publication No. 53-44343). Such a composition may be used as a flooring material as the cured molded article as it is, or may be used as a flooring material obtained by coating and curing it on a substrate such as plywood, but usually the mechanical strength, etc. Considering the above, the latter case is widely adopted.

However, although such a conventional wooden floor material is relatively excellent in soundproofing, it has a major drawback that it is poor in resistance to moisture and is easily deteriorated by moisture from under the floor.

Therefore, the present inventors have conducted intensive studies to solve the above-mentioned drawbacks of conventional flooring materials and to develop a new flooring material having excellent soundproofing and moisture resistance.

[Means for solving problems]

As a result, they have found that the above object can be achieved by using a hydroxyl group-containing liquid diene polymer instead of the conventional polyether polyol compound. The present invention has been completed based on such findings.

That is, the present invention provides a moisture-proof, sound-proof material comprising a cured coating of a liquid polymer composition comprising a hydroxyl group-containing liquid diene polymer, a polyisocyanate compound and a bituminous substance on the back surface of a wooden flooring substrate. It is intended to provide a floor material.

Hydroxyl group-containing liquid diene polymer used in the present invention, there are various ones, usually a number average molecular weight having a hydroxyl group in the molecular chain or at the end of the molecular chain is 300 to 25000, preferably 500 to 10000 liquid diene system A polymer is used. Here, the content of the hydroxyl group is usually 0.1 to 10 meq / g, preferably 0.3 to 7 meq / g.

Examples of these liquid diene-based polymers include diene polymers having 4 to 12 carbon atoms, diene copolymers, and copolymers of these diene monomers with α-olefin addition polymerizable monomers having 2 to 22 carbon atoms. There is. Specifically, butadiene homopolymer, isoprene homopolymer, butadiene-styrene copolymer, butadiene-isoprene copolymer, butadiene-acrylonitrile copolymer, butadiene-2-ethylhexyl acrylate copolymer,
A butadiene-n-octadecyl acrylate copolymer etc. can be illustrated. These liquid diene polymers can be produced, for example, by reacting a conjugated diene monomer in a liquid reaction medium in the presence of hydrogen peroxide with heating.

Further, the polyisocyanate compound is 2 in one molecule.
An organic compound having one or more isocyanate groups, which has a reactive isocyanate group for the hydroxyl group of the hydroxyl group-containing liquid diene polymer. Examples of the polyisocyanate compound include ordinary aromatic, aliphatic and alicyclic compounds,
For example, tolylene diisocyanate; hexamethylene diisocyanate; diphenylmethane diisocyanate (MDI); liquid modified diphenylmethane diisocyanate; polymethylene polyphenyl isocyanate; xylylene diisocyanate; cyclohexyl diisocyanate; cyclohexanephenylene diisocyanate; naphthalene-1,5-diisocyanate; isopropylbenzene-2, 4-diisocyanate; polypropylene glycol and tolylene diisocyanate addition reaction products,
Among them, MDI, liquid modified diphenylmethane diisocyanate, tolylene diisocyanate and the like are preferable.

Incidentally, this polyisocyanate compound may be appropriately blended with the hydroxyl group-containing liquid diene polymer,
The mixing ratio is not particularly limited, but usually the ratio of the isocyanate group (NCO) of the polyisocyanate compound to the hydroxyl group (OH) of the hydroxyl group-containing liquid diene polymer (NCO / O
H) should be in a molar ratio of 0.2 to 25, preferably 0.5 to 15. If the molar ratio is out of the above range, it becomes difficult to cure, which is not preferable.

Further, as bituminous substances, various asphalts such as straight asphalt, blown asphalt, semi-blown asphalt, solvent deasphalted asphalt, petroleum pitch, coal tar and coal pitch can be used. The bituminous substance may be blended in an appropriate amount with respect to the hydroxyl group-containing liquid diene polymer, but is usually 10 to 2000 parts by weight, preferably 50 parts by weight, relative to 100 parts by weight of the hydroxyl group-containing liquid diene polymer. Approximately 1500 parts by weight.

The liquid polymer composition used in the present invention basically comprises the above-mentioned hydroxyl group-containing liquid diene polymer, polyisocyanate compound and bituminous substance. In addition to these, if desired, a polyol compound may be added as a reinforcing agent. And various other additives can be added.

As the polyol compound added as desired, any of a primary polyol, a secondary polyol and a tertiary polyol may be used. Specifically, for example, 1,2-propylene glycol; dipropylene glycol; 1,2-butanediol; 1,3
-Butanediol; 2,3-butanediol; 1,2-pentanediol; 2,3-pentanediol; 2,5-hexanediol; 2,4-hexanediol; 2-ethyl-1,3-hexanediol; Cyclohexanediol; Glycerin; N, N-
Bis-2-hydroxypropylaniline; N, N'-bishydroxyisopropyl-2-methylpiperazine; propylene oxide adducts of bisphenol A and low molecular weight polyols containing a hydroxyl group bonded to at least one secondary carbon. To be

Further, as the polyol, ethylene glycol having no hydroxyl group bonded to secondary carbon; 1,3-propylene glycol; 1,4-butanediol; 1,5-pentanediol; 1,6-hexanediol, etc. may be used. it can.
A diol is usually used as the polyol, but triol or tetraol may be used, and its molecular weight is 50
It is in the range of ~ 500.

The polyamine compound may be diamine, triamine or tetraamine. Further, any of primary polyamine, secondary polyamine, and tertiary poamine can be used. As a polyamine compound, for example, an aliphatic amine such as hexamethylenediamine; 3,3'-dimethyl-4,
Aliphatic amines such as 4'-diaminodicyclohexylmethane; aromatic amines such as 4,4'-diaminodiphenyl; 2,4,6
And tetramine such as tri (dimethylaminomethyl) phenol.

When blending these polyol compounds and polyamine compounds, the blending ratio is not particularly limited,
Usually, the polyol compound or the polyamine compound is added in an amount of 1 to 1000 parts by weight, preferably 3 to 200 parts by weight, based on 100 parts by weight of the hydroxyl group-containing liquid diene polymer.

Further, other additives to be added as desired include, for example, fillers such as mica, graphite, flint, calcium carbonate, and straight powder.

Furthermore, a plasticizer such as dioctyl phthalate may be added as a viscosity modifier, a softener such as an aroma-based, naphthene-based, or paraffin-based oil may be added, or an alkylphenol resin, a terpene resin, or a terpene resin may be used to adjust the adhesive strength and the adhesive strength. Tackifying resins such as phenolic resins, xylene formaldehyde resins, rosins, hydrogenated rosins, coumarone resins, aliphatic and aromatic petroleum resins can also be added. Further, a curing accelerator such as dibutyltin dilaurate, stannous octoate, or polyethylenediamine may be added. Further, an antiaging agent may be added to improve weather resistance, or a silicone compound may be added as a defoaming agent.

The liquid polymer composition used in the present invention is obtained by blending and mixing the above components. The mixing procedure is not particularly limited and may be carried out in an appropriate order, but usually, the raw materials except the polyisocyanate among the above raw materials are first mixed, and the mixture is mixed at 15 to 120 ° C, preferably 70 to 100 ° C.
Stir-mix for 240 minutes, preferably 30-180 minutes, and then add polyisocyanate to this mixture at 0-70 ° C, preferably 15-50 ° C for 0.5 seconds-180 minutes, preferably 1
The liquid polymer composition is obtained by stirring and mixing for about 120 seconds to 120 seconds.

The liquid polymer composition thus obtained is applied or sprayed onto the back surface of the wooden flooring substrate, that is, the underfloor surface, and further cured to form a cured coating on the back surface of the substrate. The floor material of the present invention. Here, there are various conditions for the curing treatment, which may be appropriately selected depending on the situation, but usually a temperature of 0 to 150 ° C., preferably 1
The treatment time may be 0.5 to 75 hours, preferably 1 to 72 hours in the range of 5 to 120 ° C. The thickness of the cured coating formed on the back surface of the wooden flooring substrate in this manner may be determined in consideration of the mechanical strength of the desired flooring material, etc., but generally 0.1 to 20 mm, It is preferably about 0.3 to 10 mm.

The substrate of the flooring material of the present invention contains a natural wood component, various materials and shapes can be used, and it may be selected according to the application. Examples of the material include plywood, decorative plywood, wood wool cement, pulp cement, and wood chip cement. As for the shape, for example, square and rectangular flat plates, single chamfers,
Double-sided flat plate, L-shaped cross-section plate called bending, and plate materials of various shapes called inner skirting board, inner skirting board included, inner skirting board one-sided removal, inner skirting board one-sided chamfer Or various kinds of materials such as members for stairs.

〔Example〕

Next, the present invention will be described in more detail with reference to Examples and Comparative Examples.

Examples 1 and 2 and Comparative Example 1 The components shown in Table 1 excluding the polyisocyanate compound were blended in predetermined amounts, and mixed by stirring at 100 ° C for 30 minutes. Then, a predetermined amount of the polyisocyanate compound shown in Table 1 was added and mixed by stirring at 25 ° C. for 5 minutes to prepare a liquid polymer composition. This liquid polymer composition was applied to the back surface of a 3 mm × 300 mm × 300 mm decorative plywood in a thickness of 3 mm and cured at 25 ° C. for 24 hours to produce a soundproof flooring.

Separately, prepare the same liquid polymer composition as above, pour this liquid polymer composition into a mold, 120 ° C, 60 minutes, 200 kg
The press-curing treatment was performed under the condition of / cm ² G, and the obtained cured product was evaluated as follows. The results are shown in Table 1.

Humidity heat deterioration test 2mm x 100mm x 100mm cured product, temperature 85 ℃, humidity 85%
The sample was left in the constant temperature and humidity chamber for 168 hours, and the rate of weight change and the rate of volume change thereafter were measured.

A soundproof 2 mm x 50 mm x 50 mm cured body was repeatedly subjected to vibration using an oscillator (Toyo Baldwin Co., Ltd., DDV-11-C type, frequency 11 Hz), and its dissipation factor (tan δ) was measured.

[Advantages of the Invention] As described above, the soundproof flooring material having moisture resistance of the present invention is excellent in soundproofing and moisture resistance, and is widely used as various flooring materials for various buildings. And effective use is expected.

Claims (1)

[Claims] 1. A soundproofing having moisture resistance, which is formed by forming a cured film of a liquid polymer composition comprising a hydroxyl group-containing liquid diene polymer, a polyisocyanate compound and a bituminous substance on the back surface of a wooden flooring substrate. Floor material.