CS254839B1 - Elastic surfaces of sports grounds and other areas - Google Patents

Abstract

It relates to elastic surfaces sports grounds in indoor halls and outdoor playgrounds and other areas, for example roads for pedestrians around hotels motels and housing developments. Elastic surfaces They consist of rubber crumbs, possibly other material components, e.g. textile fibers and binders. As a binder they contain a substance prepared by reaction with hydroxyl terminated liquid rubber or of average molecular weight polyesters 1.5.103 - 8.103 and with a medium number functionality of 1.3 - 2.5 and diisocyanate in molar a ratio of 1 with 1 - 1 with 4.3, at temperature 20 to 100 ° C, or other conventional additives as a catalyst and solvent. Binder content 5 to 40 wt. mixtures. Choosing suitable polymer base rubber crumbs can be used to obtain special types of elastic surfaces industrial floors oilproof, damping vibration, etc.

Description

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ŠLE3ING? JR0VÁ MARIE ing.,

FREEDOM PAVEL ing.,

ŠMATLOVÁ TATJANA ing.

MOJŽÍŠ MIROSLAV ing.,

KOHOUTEK PETR ing.,

KULHANEK PETR, GOTTWALDOV

Elastic surfaces of sports grounds and other areas

It is concerned with the elastic surfaces of sports grounds in indoor halls and outdoor playgrounds and other areas, such as pedestrian roads around hotels, motels and residential buildings. The elastic surfaces consist of rubber crumb, any other material components such as textile fibers and binder. They contain, as a binder, a substance prepared by the reaction of hydroxyl-terminated liquid rubbers or polyesters with an average molecular weight of 1,5,103 - 8,103 and a mean number functionality of 1,3 - 2,5 and a diisocyanate in a molar ratio of 1 s 1 - 1 s 4,3, at 20 to 100 ° C, optionally other conventional additives such as catalyst and solvent. The binder content is 5 to 40% by weight. mixtures. By selecting a suitable polymeric base of rubber pulp special types of elastic surfaces of industrial floors of oil resistant, vibration damping etc. can be obtained.

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The invention relates to elastic sports surfaces and other surfaces.

In recent years, the application of polymeric materials to sports ground surfaces in indoor halls and outdoor playgrounds has expanded considerably. In addition to sports grounds, these materials are used as pedestrian roads in the vicinity of hotels, motels and residential areas with aesthetic and functional effects in terms of maintenance.

Elastic sports surfaces can be produced in two ways: the cell by direct laying the so-called. gravel polymer blends on the substrate, or by laying prefabricated treads - i.e. sheath surfaces. The sheathing may be based on polyvinyl chloride, some types of rubber, such as butadiene-styrene rubber or ethylene-propylene rubber, or it may be a rubber crumb bonded, for example, with chloroprene latex or polyurethane. Furthermore, the sheathing surfaces can be made of combined materials such as microporous rubber with a fiber interlayer bonded with acrylate dispersions and the like. For the production of squeegee elastic surfaces, used rubber tire shredding and a liquid binder based on polyurethane or a polymer dispersion such as chloroprene latex, polyvinyl acetate latex or acrylate latex are usually used.

In the production of elastic surfaces, rubber grind with binder based on polyurethane has clearly prevailed recently. However, the liquid binder based on polyurethane has some drawbacks. Especially for this field of application, it is the disadvantageous glass transition temperature of the binder that causes the elastic surfaces to solidify at lower temperatures. This is particularly disadvantageous for elastic surfaces

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for outdoor sports grounds, when lowering the ambient temperature to the freezing point, the joints of the athletes may be damaged during the stepping and rebound due to the surface hardening at higher training frequency, because the surface is stiffer than required by the type of sport. In the case of outdoor surfaces of sportmeME at lower ambient temperatures, the frost resistance of polyurethane or chloroprene polyvinyl acetate or acrylate latex-based binders causes the erosion of the elastic surface mass by the formation of water crystals in the material structure. When using polyurethane, chloroprene and other conventional binders, materials for elastic surfaces have a relatively narrow elasticity interval in which individual qualities can be prepared by varying the composition of the compositions.

These disadvantages are solved by the elastic surfaces of sportswear and other surfaces according to the invention. The elastic surfaces according to the invention consist of rubble or other material components, such as textile fibers, microporous rubber, polyurethane foam, and a binder.

It is an object of the invention that these surfaces comprise as a binder a substance prepared by the reaction of hydroxyl-terminated liquids

Of other rubbers or polyeaters having a molecular weight of 1.5.1 () 3 - 8.1 () 3 _{Q with a} mean number functionality of 1.3 - 2.5 with diisocyanate in a molar ratio of 1: 1.5 - 1: 4.3 at temperature 20 - 100 ° C. The binder may contain other conventional additives, such as a catalyst and a solvent. The binder materials can be hydroxyl-terminated oligobutadiene, copolyoligobutadiene acrylonitrile or polyester. From the group of diisocyanates, for example, 2,6 toluene diisocyanate or 4.4 ^of diphenylmethane diisocyanate can be used.

Said substances react with diisocyanates to polymers terminated with isocyanate groups which, when in contact with the rubble surface, can react with suitable functional groups containing active hydrogen, present in the rubble surface layers or react with water present on the rubble surface or as air humidity to amine groups. Aminové skupiny

3,254,839 then react longer with isocyanate groups and, as a result, these reactions lead to the interconnection of the individual particles of pulp into a mechanically compact unit which, according to the technical embodiment, forms a water-permeable mat or an impermeable elastic layer.

The rate of preparation of the binder as well as the rate of the actual crosslinking reaction of the binder after mixing with the rubber pulp can be catalyzed. The quantity and type of catalyst can be used to streamline the process and thus the elastic surface laying technology. Improved contact of the rubber pulp with the binder during the mixing process can be achieved by adding a solvent in the range of 1-30% by weight (e.g. toluene, acetone, trichlorethylene).

The most common material used for the production of elastic surfaces is rubber grit with a particle size of 1.0-10 mm. used tires, in rare cases by crushing other rubber wastes and scrap (technological wastes with a suitable polymer base). Used cargo tire rubbers with textile reinforcement are based on natural and butadiene-styrene rubber, used cargo tire rubbers with steel reinforcement are mainly based on natural rubber, and, in the case of personal tires, contain a combination of butadiene-styrene rubber and butyl rubber. Quite exceptionally, unused rubber made specifically for this purpose can be crushed when it is necessary to achieve an elastic surface of a color other than black from a rubber material that does not contain coloring types of antioxidants.

The elastic surfaces of the sports and other areas according to the invention are characterized by good rubber-binder cohesion, good adhesion to reinforcing materials such as textiles, synthetic and natural fibers, foam rubber, expanded polyurethane and polyvinyl chloride and others. Adhesion to sports grounds (gravel concretes, drainage etc.) is good in case of direct laying on the place of destination. Furthermore, these surfaces are characterized by good mechanical properties, frost resistance, elasticity and rebound elasticity required for each sport, excellent resistance to permanent deformation and high

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254 838 dry friction coefficient and good wet coefficient - i.e. low slip.

A comparison of selected physico-mechanical properties of elastic surfaces prepared with different types of binders is given in Table I.

Binder binder masses. % Mrazu- defiance- ngst Trval.defor. in pressure ČSN 917822 Odraz.pruž. ČSN 622481 Koef. friction ASTM D1894 25 ° C At ₉₀ ° C% for drought for wet 30lyaer x) 28 -55 0.24 56 64 1.48 0.76 PUR 20 May -30 0.24 43 63 0.41 0.46 CR Latex 30 -22 0.84 43 29 0.86 0.98 PVAc 20 May -20 0.76 30 31 0.47 0.58 Poly- acrylate 20 May -20 0.98 14.5 27 Mar: 0.5 0.46

x) The feedstocks for the preparation of this binder were hydroxyl-terminated oligobutadiene with an average molecular weight of 3,420 and an average number functionality of 2.0 and 2.6 toluene diisocyanate with an average molecular weight of 174 and an average number functionality of 2.

The following examples serve to illustrate the invention in more detail.

Example 1

Material composition for elastic sports surface

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Rubber pulp made of tablecloths and cuts of used cargo tires with textile reinforcement, fraction 1,4-4 mm .................... 60 g

Rubber pulp of tablecloths and cuts of used cargo tires with textile reinforcement, fraction over 4 mm. ······. ··········· 40 g

Binder ............................................ 23 g

The binder is a substance based on oligobutadienediol with an average molecular weight Mh3 of 400 terminated with hydroxyl groups and 2,4-toluenediisocyanate, with a molar ratio of NCO ”: OH” = 2: 1.0-1.2 with an addition of 10% by weight. % toluene and 0.5 wt. triethylenediamine.

Example 2

Material composition for elastic sports surface

Rubber grit with particle size 0.1—6 mm .............. 100 g

Binder ................................................ 35 g

The binder is a hydroxyl-terminated oligobutanediol compound having an Mh of 5,000 and 4,4-diphenylmethane diisocyanate in a molar ratio of NCO: OH ~ 2.5: 1 with an addition of 20% by weight. % toluene and 0.3 wt. triethanolamine.

Example 3

Material composition for elastic surface of industrial halls resistant to oils.

Rubber crushed from technological homogeneous rubber wastes (overflows, rejects) based on butadiene acrylonitrile rubber with an average acrylonitrile content of 30%, fraction 1,4 - 4 mm .................... ........... 100 g

Binder ....................., ........................ 30 g

The binder is a substance prepared from hydroxyl-terminated copolyoligobutadiene acrylonitrile and 2,6-toluene diisocyanate in a molar ratio of NCO ': OH - 2: 1 and with the addition of 10% by weight of binder. toluene. Example 4

Material composition for elastic surface of industrial halls Rubber rubbers from rubber waste (from recovered waste products or from technological waste), fraction 0,5-5 mm .................... ............... 100 g binder ................................ ............. 35 _g

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The binder is an OH-terminated polycaprolactone-based substance with an Mh of 8,000 and 4,4-diphenylmethane diisocarbonated therein in a molar ratio of NCO ": OH" = 2.5: 1 with an addition of 15% by weight. % toluene and 0.2 wt. glycerin.

As already mentioned in the examples, by selecting a suitable polymeric base of rubber pulp, it is possible to obtain special types of elastic surfaces for industrial floors, oil-resistant, vibration-damping, and the like.

Claims (1)

SUBJECT OF THE INVENTION Elastic surfaces of sports jackets and other surfaces, consisting of rubber crumb, any other material components, such as textile fibers and binder _; characterized in that they contain as a binder a substance prepared by the reaction of hydroxyl-terminated liquid rubbers or polyesters with an average molecular weight of 1,5 * 10 ^ - 8.1 () of 3 _{and 3θ sequence numbering} function of 1,3 - 2,5 with diisocyanate in a molar ratio of 1: 1.5 - 1: 4.3, at a temperature of 20-100 ° C, and optionally other conventional additives such as catalyst and solvent, wherein the binder content is 5-40% by weight. mixtures. Printed by Moravian Printing Works,