RU2294349C1 - Method of manufacturing running-track and playing ground coverings - Google Patents

Abstract

FIELD: manufacture of polymeric building materials.

SUBSTANCE: running-track and playing ground coverings are manufactured by depositing mixture of rubber crumb and isocyanate prepolymer-based composition, in which process rubber crumb is preliminarily mixed with water and further isocyanate prepolymer-based composition is added, said composition being made up of, wt parts: isocyanate prepolymer 100, polymethylene-polyphenylisocyanate 25-46, glycerol 8-11, catalyst 0.01-0.10, and water 0.6-1.5.

EFFECT: simplified technology and improved sports and technical characteristics of covering.

1 tbl

Description

The invention relates to the industry of polymer building materials and can be used for the manufacture of coatings for treadmills and sports fields.

A known method of obtaining a composition for covering sports fields, including mixing 1/2 of the α-methacryl-ω-carboxyltriethylene glycolphthalate with a urethane prepolymer and curing catalyst, mixing the other half of the oligoester methacrylate with a mineral filler, followed by dispersing the resulting mixtures and introducing crumb rubber44 44 SU80 (SU 16) into the composition (SU 16 E 01 C, 1991).

The disadvantage of this method is the need to separate the composition into two components, which increases labor costs, as well as high rigidity and injury risk of the coating due to the presence of oligoester acrylate.

A known method of obtaining a composition for polyurethane coatings by mixing a urethane prepolymer with a mineral filler, catalysts, polyol, chloroparaffin and an ester plasticizer, the filler being pre-mixed in a ball mill with chloroparaffin and plasticizer (RU 2151160, C 09 D, 2000) for at least 4 hours.

The disadvantage of this method is the low productivity of the process and unsatisfactory sports and technical properties of the resulting coatings.

As a prototype, the solution was chosen according to a. S.SSSR 1767060, E 01 C 13/00, 1992, according to which a composition based on an isocyanate polyester prepolymer, hardener and diluent is applied layer-by-layer with subsequent application of a rubber crumb of a fraction of 1.5-3.0 mm, removing non-stick crumbs through 15-17 hours and holding the layer for 20-24 hours, applying a composition containing a mixture of a polyester and hydrocarbon isocyanate prepolymer, hardener and crumb rubber, holding it for 20-24 hours, followed by applying a composition comprising a polyester prepolymer, cure body, pigment and rubber crumb fraction 0.2-1.0 mm

The disadvantages of the prototype include the complexity, duration and complexity of the process. The high content of amine hardener, which forms highly polar urea and biuret cross-links in the structure of the material, leads to a coating with a high dynamic modulus. This negatively affects the injury safety of the coating due to a lead in the reaction time of the support over the period of support loading during running [1].

The task of the invention is to simplify the manufacturing process of the coating and improve its sports and technical properties.

The problem is achieved in that in a method for the manufacture of coatings for treadmills and playgrounds, including applying a mixture of rubber crumb and a composition based on an isocyanate prepolymer to a rigid base, pre-crumb rubber is mixed with water in a ratio of 100: (0.6-1.5) and then enter the composition based on an isocyanate prepolymer containing, by weight:

Isocyanate prepolymer one hundred Polymethylene polyphenyl isocyanate 25-46 Glycerol 8-11 Catalyst 0.01-0.10

in the following ratio of components, parts by weight:

Rubber crumb one hundred Water 0.6-1.5 Based composition isocyanate prepolymer 8-17

which is then applied to a rigid base and rolled.

The technical result in the implementation of the proposed method is expressed in reducing the number of operations in the manufacture of a coating and obtaining a material with a dynamic modulus value in the range of 4.0-6.0 MPa and a ratio of the relaxation time of the coating to the reference loading period in the range of 0.9-1.1.

The essence of the proposed sequence of technical operations and component composition of the composition is as follows.

When water is introduced into the rubber crumb, its surface is activated by filling micro-inhomogeneities and defects in the surface structure of the granules. Moisturized crumb mixes well with the components of the isocyanate composition to form a plastic mass that is easy to mold. The components of the composition are conditionally compatible with individual mixing, however, in the presence of rubber crumb, they intensively disperse each other. In this case, water adsorbed on the surface of the elastic filler is, like glycerin, a hardener of the isocyanate-containing components of the composition. The presence of an organotin catalyst in the system equalizes the reactivity of water and glycerol hydroxyl groups with respect to the isocyanate groups of the prepolymer and polymethylene polyphenyl isocyanate. This achieves the regularity of the structure of the cured binder containing urea fragments bonded to the surface of the rubber granules and urethane crosslinking units in the bulk of the material. In addition, the use of a prepolymer in a certain combination with polymethylene polyphenyl isocyanate provides high deformation-strength properties and the level of adhesive interaction between the binder and rubber crumb. Due to this, under shock loading, the optimum reactivity of the coating is realized.

In the proposed method, the following components are used. Crumb rubber obtained by crushing vulcanized, non-textile rubber (TU 38-108015-85. Crushed rubber for sports tracks; TU 2511-002-34702590-00. Color rubber granulate) with a particle size of 1-5 mm.

As the isocyanate prepolymer, the products of the interaction of polyols with 2,4-toluene diisocyanate or diphenylmethane diisocyanate are used, for example: ADV-17 (TU 2226-023-22-73-69-60-96), SKU-PPG-4503 (TU 38.403708-91) , SKU-PFL-100 (TU 38.103137-87), Krasol NN-22 (L9K017, Czech Republic). As the polymethylene polyphenyl isocyanate, the phosgenic condensation products of aniline with formaldehyde are used: PIC D (TU 113-03-7822270-1-92), Desmodur (manufactured by Bayer), Voranate ("Du Pont"). As a catalyst, tin salts are used: tin dibutyldylaurinate (TU 6-02-818-78), Irgastab 17MOL, Thermolight (Ciba).

A method of obtaining a coating is as follows. Rubber crumb is charged into a paddle mixer. Then add the calculated amount of water. The mixing time is 8-10 minutes. Then, polymethylene polyphenyl isocyanate, isocyanate prepolymer (IFP), glycerol and a catalyst are successively introduced. The mixing process is continued until the chips of the compositions are completely wetted for 10-20 minutes. The resulting mass is applied to the base and rolled.

The dynamic modulus, the tangent of the angle of mechanical losses, and the ratio of the relaxation time to the period of support loading τ / T are determined by the shock compression method [2, 3].

The following materials were used in the examples (table).

Example 1 (according to the claimed object): isocyanate prepolymer SKU-PPG-4503, polymethylene polyphenyl isocyanate brand PIC D, the catalyst is tin dibutyl dilaurate.

Example 2 (according to the claimed object): isocyanate prepolymer ADV-17, polymethylene polyphenyl isocyanate brand Desmodure, the catalyst is Thermolight.

Example 3 (according to the claimed object): isocyanate prepolymer SKU-PFL-100, polymethylene polyphenyl isocyanate brand Voranate, the catalyst is Irgastab 17 MOL.

Example 4 (according to the claimed object): Krasol NN-22 isocyanate prepolymer, Desmodure brand polymethylene polyphenyl isocyanate, and tin dibutyl dilaurinate catalyst.

Examples 5 and 6 (control): ADV-17 isocyanate prepolymer, Desmodure polymethylene polyphenyl isocyanate, Thermolight catalyst.

From the data of the table it can be seen that the implementation of the proposed method is possible with a certain sequence of technological operations and a fixed component composition. The method is simple, economical and productive. The coatings obtained by the method of examples 1-4 have optimal dynamic and elastic-hysteresis characteristics. Improved sports and technical performance indicators provide injury safety and comfortable conditions for the functioning of the musculoskeletal system of athletes.

Information sources

1. Ogrel A.M., Medvedev V.P., Medvedev V.P. Sports elastomeric coatings and criteria for evaluating their properties // Rubber and Rubber. 1991. No. 3, p.22-26.

2. Kuvshinsky E.V., Sidorovich E.A. Pendulum elastomer KS // Journal of Theoretical Physics. 1957.V. 26. No. 4, p. 878-886.

3. Sidorovich EA, Kuvshinsky EV Studying the shock compression of rubbers // Ibid. 1961. V.3. No. 11, p. 3487-3494.

Table Name of components and indicators Examples Prototype one 2 3 four 5* 6 The composition of the mixture, parts by weight: According to example 2 a.s. USSR 1767060 Rubber crumb one hundred one hundred one hundred one hundred one hundred one hundred Water 0.6 0.9 1,2 1,5 1.8 0.3 IFP composition 8 eleven fourteen 17 5 twenty The composition of the composition based on the IFP: IFP one hundred one hundred one hundred one hundred one hundred one hundred Polymethylene polyphenyl isocyanate 46 39 32 25 53 eighteen Glycerol eleven 10 9 8 12 7 Catalyst 0.01 0,03 0.06 0.10 0.005 0.13 Dynamic modulus of elasticity, MPa 6.0 5.9 4.7 4.0 3.2 3.6 8.3 Mechanical loss tangent 0.12 0.12 0.14 0.17 0.26 0.22 0.17 Ratio τ / T 1.10 1.05 1.00 0.90 0.82 0.88 1.26 Note. In Example 5, water was added to the mixture last.

Claims (1)

A method of manufacturing coatings for treadmills and playgrounds, comprising applying to a rigid base a mixture of rubber crumb and an isocyanate prepolymer composition, characterized in that the rubber crumb is pre-mixed with water and then an isocyanate prepolymer composition is introduced, containing, by weight: Isocyanate prepolymer one hundred Polymethylene polyphenyl isocyanate 25-46 Glycerol 8-11 Catalyst 0.01-0.10 in the following ratio of components, parts by weight: Rubber crumb one hundred Water 0.6-1.5 Based composition isocyanate prepolymer 8-17 the composition obtained by mixing the components is then applied to a rigid base and rolled.