JPS58191802A - Elastic pavement - 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 an elastic body, and more particularly to a low-foamed elastic body for paving sports facilities, etc., using a laminated composite of the low-foamed elastic body and a non-foamed elastic body.

For elastic pavement of sports facilities such as former tennis courts%tm gymnasiums,
Conventionally, materials such as polyurethane-based, rubber asphalt-based, and 5BR (styrene-butadiene-rubber) yarns have been used, but the superiority of polyurethane-based materials has been recognized, and 7-1
Paving with a wall thickness of 0 mm is being carried out. The problem with these polyurethane elastic pavement materials is that they are expensive, and to prevent increases in material costs, crushed particles of waste rubber, chips of waste polyurethane elastomer, ethylene vinyl acetate copolymer powder, etc. are mixed with the polyurethane raw material. Measures are being taken to reduce prices.

Such a method has the disadvantage that increasing the filling amount reduces workability and also greatly reduces the physical properties of the laminate.

Another method to reduce the price is to foam polyurethane. In this method, after adding water and/or Freon-11 as a foaming agent to the polyol that is the raw material for the polyurethane elastomer, Ichiki polyisocyanate is added. The liquid mixture is mixed with the liquid mixture and applied to the substrate by spraying, spreading, or the like before the liquid mixture starts foaming. The applied mixture is concentrated in the depressions on the base surface, and when foaming occurs due to carbon dioxide gas generated by reaction with water or Freon-11 vaporized by the heat of reaction,
The problem was that this portion expanded to a greater extent, creating large irregularities on the surface. Another disadvantage is that it is difficult to control moisture, and furthermore, the expansion ratio changes markedly depending on the temperature, making it extremely difficult to adjust the application thickness.

The present inventors conducted extensive studies to eliminate the above-mentioned drawbacks. 1. We mechanically mixed an inert gas uniformly into a system consisting of an organic polyisocyanate and a curing agent, which are normally used for civil engineering and construction materials, and developed , stable floss for work such as breaking in (
They succeeded in making a foam (foam), and found that after applying pressure onto a base, if left at room temperature, it would harden to become a desired elastic body, leading to the present invention.

That is, the present invention is as follows.

1. When mixing organic polyisocyanate, polyol, crosslinking agent and other auxiliary agents, mechanically mix inert gas uniformly into the mixture under the foam stabilizer cloth, and then place on a mounting plate. A foamed elastic pavement obtained by spreading and curing, wherein the foamed elastic material has an expansion ratio of 1.05 to 1.50.

2. When mixing the organic polyiso/anate, polyol, crosslinking agent, and other auxiliary agents, in the presence of a foam stabilizer, mechanically mix and disperse an inert gas into the mixture, and then spread it on the substrate. 1. A foamed elastic composite pavement characterized in that a non-foamed elastic material is laminated and composited on the surface of a foamed elastic material obtained by curing and having an expansion ratio of 1.05 to 1.50.

In the present invention, the foamed elastic material is used as the surface layer for physical education facilities that require a particularly flexible surface, such as playgrounds in nursery schools, and this foamed elastic material is used for physical education facilities that require strength, such as stadiums and tennis courts. Preferably, a layer of non-foamed elastic material is laminated on top of the dove.

The organic bolyinone assembly used in the present invention is, for example, 2
・4-tolylene diisocyanate, 2,6-tolylene dinonanate, a mixture of both compounds in a weight ratio of 80:20 or 65:35, free tolylene diisocyanate, metaphenylene diisocyanate, polymethylene polyphenylisocyanate (crude diphenylmethane diisocyanate).

These organic polyisocyanates are hexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate, etc., and these organic polyisocyanates are used alone or in combination. These organic polyisocyanates are reacted with a polyol and a crosslinking material by a prepolymer method or a one-silanod method. In the case of the prepolymer method, the total amount of polyisocyanate used and a part of the polyol are, for example, 30 to 12
React at 0°C to form a prepolymer. In this case, the equivalent ratio (NGOloH) between the NCO group in the polyisocyanate and the OH group in the polyol is suitably 2 to 20, and the free NGO group contained in the prepolymer is 1715% by weight. ).

The polyol used in the present invention is water, ethylene glycol,
A polyether polyol obtained by addition polymerization of one or more alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, or Fi2 or more to polyhydric alcohols such as propylene/glycol, glycerin, trimethylolpropane, and pentaerythritol.
In addition to the above, polyester polyols obtained by reacting polycarboxylic acids with low-molecular-weight polyols, polyester polyols obtained by polymerizing caprolactone, and OH group-containing fatty acids such as castor oil can also be used. Further, polymer polyols obtained by graft polymerizing ethylenically unsaturated compounds such as acrylonitrile, snalene, methyl methacrylate, etc. to the above-mentioned known polyether polyols or polyester polyols and 1.2- or 1.4-<liptadiene. Polyols or hydrogenated versions thereof can also be used. The average molecular weight of these polyols is usually 2oO to 1o
ooo1 Particularly preferable crosslinking materials are 300 to 7000, such as ethylene diamine, hexamethylene diamine, p-phenylene diamine, 3.3' compounds, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butanediol, hexanediol, and glycerin. , polyhydric alcohols such as trimethylolpropane and alkanolamines such as jetanolamine and triethanolamine are used. 1. The amount of organic polyisocyanate, polyol and crosslinking agent used is based on the NCO group in the organic polyincyanate, The equivalent ratio (NGO/H) to the total amount (H) of active hydrogen in the polyol and crosslinking agent is adjusted to 0.95-L 2.0. If the equivalence ratio is lower than this range, the strength of the elastic body will drop significantly and it will be difficult to withstand use, and if it is higher than this range, the elastic body will harden and lose its elasticity significantly.

Foam stabilizers suitable for the present invention include, for example, JP-A No. 51-75683;
The organosilicon surfactant described in No.
Siloxane block 20-50X with average molecular weight of about 50.0-10,000, average molecular weight of about 300-10,000
The average molecular weight is approximately 30. OOQ~250,000 M-type polyoxyalkylene block copolymer. The amount of 111 #i used is preferably 1 to 20% based on the total amount of raw materials used.

Examples of the catalyst include N-methylmorpholine, triethylamine, triethylamine, N,N.

Tertiary amines such as N/, N/-tetramethyl, propanediamine, bis(2-methylaminoethyl) ether, lead octoate, lead naphthenate, octanoic acid moiety,
Organometallic compounds such as diptyltin dilaurate are used alone or in combination. The amount used is preferably 0.001 to 5% of the total amount of raw materials used, and considering the inert gas mixture and construction time described below, in the case of punch mixing, the V1 town time is 60 minutes or more. Adjust. Meanwhile, mixing of raw materials,
In the case of continuous mechanical mixing in which the inert gas is mixed in and discharged almost simultaneously, it is possible to adjust the amount of catalyst to create a rapid curing type with a pot life of about 15 minutes.

Other auxiliary agents used in the present invention are fillers, plasticizers, stabilizers, colorants, etc. Fillers include, for example, carbon black, cal/rum carbonate, titanium dioxide, Merck, etc., and plasticizers. For example, dioctyl phthalate (D
OP), diptyl phthalate (DBP), dioctyl adipate (DOA), tricresyl chloride acid (TCP), paraffin chloride, etc. The filler and plasticizer are used in such a manner that their total amount is 15 to 70% of the total amount of raw materials used.

When using the described raw materials in the prepolymer method, the remainder of the polyol used in the production of the prepolymer, a foam stabilizer,
The crosslinking material and other auxiliary agents are rolled together to form a hardening agent. In addition, in the case of g2 kneading by the one-piece method, the entire amount of polyol, a foam stabilizer, a crosslinking agent, and other auxiliary agents are kneaded in a rotor to form a curing agent.The inert gas used in the present invention is air, Nitrogen is available, but air is preferable, and the lid used has a foaming ratio of 1.
．． An appropriate amount is 0.05 to 1.5 times as much. 1 If the foam magnification is lower than this range, the shock absorption capacity will be insufficient, and if the magnification is higher than this range, the load-bearing ridge will be reduced, so during rapid running, the dent under the foot will become a large roll, and #jl technique Facility V
CFi becomes inappropriate.

In applying the present invention, in the case of batch mixing, the organic bolyinone-F and/or prepolymer and the curing agent are thoroughly mixed using a conventional mixing method, and then the curing agent is
The inert gas Xt is uniformly mixed in using a mixer or the like, and a smooth finish is applied to a base such as conocrete, mortar, asphalt concrete, etc. using a fi*L, trowel, glue/mesh trowel, etc.

In the case of mechanical mixing, VC #'i, 0, ke, Miki Sakura, etc. can be used to simultaneously mix two types and uniformly incorporate air bubbles. As the non-foamed elastic material to be laminated, use 1 or 2 of elastic materials such as urethane/thread, rubber asphalt, chlorobrane/thread, acrylic, SBR, etc.
River.

The foamable material of the present invention is a low foam foam with a magnification of 1.05 to 15 times, and most of the bubbles are bubbles.
Since it is mechanically mixed with air I'tgLf, it does not have the disadvantages of ordinary low-expansion foams such as shrinkage, poor impact resilience, and large compression set. Compared to foamed vinyl chloride sheets, etc., it has superior rebound resilience and elastic recovery. Additionally, compared to pavement made only of non-foamed elastic materials such as polyurethane, impact absorption performance is greatly improved. Furthermore, in terms of workability such as workability, it is also a major feature of the present invention that it can be easily constructed in substantially the same manner as non-foamed elastic bodies.

In the present invention, in order to improve the adhesion between the base and the foamed elastic body, or between the foamed elastic body and the surface laminate, a known primer or adhesive is used as necessary.

EXAMPLES Next, the present invention will be specifically explained with reference to Examples, but the present invention is not limited by these in any way.

Example 1 A curing agent A was obtained by kneading the following compound shown in A in Table 1 using a roll. Curing agent A, 100 parts P-306 (Mitsui Nisso Urethane Co., Ltd. urethane prepoly-1 NGO content 2.9%
) After mixing with 100 parts of the mixture, air was continuously mixed in using a Hob 1 mixer to obtain a foam with an expansion ratio of 1.45 times. This was poured onto asphalt concrete and smoothed to a thickness of 5 mm using a trowel and rake. During the leveling work, no bubbles collapsed, and the workability was no different from that of non-foamed concrete.

The use time for 6 parts of this foam was 70 minutes, and when it was left for one day and night, it hardened and became a foamed elastic body.

On top of this, apply a non-foamed polyurethane raw material mixture to a thickness of 2 m.
It was washed with mK and left to harden day and night. The resulting pavement had extremely good running feel and ball resilience, and had excellent characteristics as a tennis court. %) and a curing agent 6 obtained by roll kneading 100 parts of the formulation shown in B in Table 1.
00 parts were mixed continuously using a regular rotor mixer type Urethane Elasto 7 continuous casting machine (manufactured by Toho Kikai Co., Ltd., Model A240) while feeding a small amount of air into the mixing chamber, and the foaming ratio was increased to l. . You can get 3 times the amount of foamy stock solution. This stock solution had fine air bubbles uniformly dispersed therein, and was immediately poured onto asphalt concrete to a thickness of 1 rpm and left to harden day and night. The pot life Fi of this foamy stock solution was 15 minutes.

A non-foamed polyurethane raw material mixture was poured onto the cured foamed elastic body to a thickness of 2 mm, and left to harden day and night. As a result of repeatedly running spikes on the resulting pavement, we found that it had significantly better spike resistance than pavement that had been mixed with crushed rubber particles.

Example 3 The formulation shown in CI/c in Table 1 was kneaded with a roll and then mixed with 1100 parts of curing agent C and MD I-CR (crude diphenylmethane diisocyanate manufactured by Mitsui Nippon Urethane Co., Ltd., NC).
O content 3Q, 6X) 12.2 parts and 0akes
Mixing was performed using a mixer to obtain a foamy stock solution with a foaming ratio of 1.05 times. This was poured onto asphalt concrete to a thickness of 10 mm and left to harden day and night. The resulting foamed elastic material has a soft feel and has been found to be highly safe as paving for nursery school playgrounds.

Table 1: Combination of curing agents (Note 1) 3,3'-dichloro-4,4'-diaminodiphenylmethane (Note 2) Liquid amine crosslinking agent manufactured by Mitsui Nisso Urethane Co., Ltd. (Note 3) Manufactured by Mitsui Nisso Urethane Co., Ltd. Polypropylene glycol (OH value 37.5) (Note 4) 2ON graft addition of styrene and acrylonitrile mixture to polypropylene glycol with a molecular weight of 2000 (OH value 4.5) (Note 5) Dioctyl phthalate (Note 6) Organosilicon Surfactant (foam stabilizer manufactured by Nippon Unicar) (Note 7) Lead octoate solution (catalyst) Patent applicant Mitsui Nisso Urethane Co., Ltd.

Claims (1)

[Claims] 1. When organic polyincyanate, polyol, crosslinking agent and other auxiliary agents are mixed, an inert gas is mechanically mixed and dispersed into the mixture in the presence of a foam stabilizer. A foamed elastic pavement obtained by spreading and curing on a base, characterized in that the foamed elastic material has an expansion ratio of 1.05 to 1.50. 2. When mixing organic polyisocyanate, polyol, crosslinking agent and other auxiliary agents, in the presence of a foam stabilizer, mechanically mix and disperse an inert gas into the mixture, and then spread it on the substrate. A foamed elastic composite pavement characterized in that a non-foamed elastic material is laminated and composited on the surface of a cured foamed elastic material having an expansion ratio of 1.05 to 1.50.