RU2425854C1 - Composition for sports coatings - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: composition for sports coatings contains oligobutadiene diol, a plasticiser, mineral filler, trifunctional low-molecular alcohol, polymethylene polyphenylene polyisocyanate with 29.5-31.0% content of isocyanate groups, an organotin catalyst, 2,4,6-tri-tertbutylphenol, polysulphide oligomer, isocynate prepolymer, aromatic diamine which is a mixture of 2,4- and 2,6-isomers of 3,5-dimethylthiotoluylenediamine in ratio of 80:20 and diatomite.

EFFECT: improved dynamic and physical-mechanical properties of coatings.

2 tbl

Description

The invention relates to compositions for sports coatings based on liquid hydrocarbon rubbers for the manufacture of treadmill coatings, roofing, waterproofing coatings for swimming pools, flooring and sports fields.

A known composition for the manufacture of elastic coatings, including low molecular weight butadiene-piperylene rubber, calcium oxide, chalk, glycerin, a urethane formation catalyst, polyisocyanate and triethylbenzylammonium chloride [RF patent 2211850 C1, cl. 6 C09D 109/00, publ. 1999].

A wide distribution according to the type of functionality of the butadiene-piperylene oligomer causes the defectiveness of the three-dimensional network formed during curing by the polyisocyanate, which is a consequence of the low level of dynamic and physico-mechanical properties of the coating.

A known composition for coating sports fields and waterproofing coatings, including hydroxyl-containing oligodienediol - a copolymer of isoprene and butadiene, a plasticizer, a mineral filler, a trifunctional low molecular weight alcohol, an urethane formation catalyst, 2,4,6-tri-tert-butylphenol, a hardener polyisocyanate and additionally patented ethyl silicate C09D 109/00. Publ. 08/10/2002].

The disadvantage of these compositions is the low level of dynamic and physico-mechanical properties of cured elastomeric coatings.

A known coating composition comprising oligobutadiene diol, a plasticizer, a mineral filler, a trifunctional low molecular weight alcohol, an organotin urethane formation catalyst, 2,4,6-tri-tert-butylphenol, polyisocyanate and ethyl silicate [RF patent 2190002, cl. 7 C09D 109/00. Publ. 2002].

The disadvantage of these compositions is the low level of dynamic and physico-mechanical properties.

The closest solution to the proposed invention (prototype) is the composition described in the method for producing the composition for coating [RF patent 2325418, C09D 175/08. Publ. 05/27/2008, bull. No. 15], including oligobutadiene diol, a plasticizer, a mineral filler, a trifunctional low molecular weight alcohol, an organotin urethane formation catalyst, 2,4,6-tri-tert-butylphenol, polymethylene polyphenylene polyisocyanate with an isocyanate group content of 29.5-31.0% and a polysulfide ratio parts by weight:

Oligobutadiene diol one hundred Plasticizer 5-30 Mineral filler 90-150 Trifunctional low molecular weight alcohol 1-5 Specified Polyisocyanate 14-24 Organotin catalyst 0.01-1.10 2,4,6-Tri-tert-butylphenol 0.5-1.5 Polysulfide oligomer 5-15

Coatings from this composition are characterized by an insufficient level of dynamic and physico-mechanical properties.

The technical result is to increase the level of dynamic and physico-mechanical properties of the compositions.

The technical result is achieved in that the composition for sports coatings, including oligobutadiene diol, a plasticizer, a mineral filler, a trifunctional alcohol, polymethylene polyphenylene polyisocyanate with an isocyanate group content of 29.5-31.0%, an organotin catalyst, 2,4,6-tri-tert-butylphenol, the polysulfide oligomer further comprises an isocyanate prepolymer, an aromatic diamine which is a mixture of 2,4- and 2,6-isomers of 3,5-dimethylthiotoluene diamine in a ratio of 80:20 and diatomite in the following Ocean components in parts by weight .:

Oligobutadiene diol one hundred Plasticizer 5-30 Mineral filler 80-100 Trifunctional low molecular weight alcohol 1-5 Specified Polyisocyanate 14-24 Organotin catalyst 0.01-1.10 2,4,6-Tri-tert-butylphenol 0.5-1.5 Polysulfide oligomer 5-15 Isocyanate prepolymer 10-30 Specified Aromatic Diamine 3-6 Diatomite 10-30

Introduction to the composition of the composition of an additional binder, an isocyanate prepolymer having a large number of kinetically mobile ether bonds, provides effective dissipation of stresses in the polymer matrix under dynamic loading. The use of the specified aromatic diamine helps to increase the depth of conversion of the functional groups of the isocyanate prepolymer. The claimed amount of isocyanate prepolymer and aromatic diamine determines the optimal ratio of crosslinked and linear chains in polyurethanes, as a result of which the resulting materials have improved dynamic and physico-mechanical properties. The presence of diatomite leads to the appearance of structural formations that contribute to the preservation of a given level of properties during the operation of sports surfaces.

As the oligobutadiene diol, the composition uses a copolymer of butadiene and isoprene PDI-1K (TU 38.103342-88) with a monomer ratio of 70:30; molecular weight 4000-5000; the content of hydroxyl groups, wt.%, 0.75-0.89, and oligodienediols with a molecular weight of 2000-5000; a polydispersity index of 1.20-1.35; Brookfield viscosity, Pa / s (25 ° C), 8.5-22; the content of terminal hydroxyl groups,%, 0.7-1.7; microstructure,%, 1,4-cis 10-15, 1,4-trans 20-25, 1,2- (vinyl) 60-70; distribution by OH groups (RTF),%, non-functional 2, monofunctional 6, bifunctional 92; density, kg / m ³ , 900-910 (oligodienediols Krasol LBH manufactured by Sartomer).

As a plasticizer, the composition contains compounds used in the manufacture of elastomeric materials based on diene rubbers: alkyl (aryl) esters of phthalic or phosphoric acid, chloroparaffins.

Fillers for the rubber base are mineral powders of medium fineness, such as chalk, lime-screenings, calcium oxide, kaolin, talc.

2,4,6-Tri-tert-methylphenol is a crystalline powder with a greenish-yellow tint, highly soluble in hydrocarbons, and has the following characteristics: melting point 129-131 ° C, mass fraction of ash not more than 0.05%. Obtained by alkylation of phenol with isobutylene in the presence of a catalyst. Trade name - antioxidant P-23 (TU 6-14-26-77).

As the polysulfide oligomer (PSO), liquid thiocols of grades I, II and NVB-2 are used, characterized by a number average molecular weight of 1700-5500; number average functionality 2.22-2.68; the content of SH groups of 1.6-4.3; viscosity Pa / s (25 ° C) 7.5-50 (GOST 12812-80, TU 38.50309-93).

Diatomite (TU 5761-001-25310144-99) is a light porous rock from white to yellowish-gray in color with an average density ranging from 0.15 to 0.6 g / cm ³ . Diatomite for 96% consists of aqueous silica (opal) of the general formula SiO ₂ · nH ₂ O.

As a trifunctional low molecular weight alcohol, glycerin, triethanolamine or trimethylolpropane are used in the composition.

Polymethylene polyphenylene polyisocyanates obtained by phosgenation of the condensation product of aniline with formaldehyde (TU 2224-152-04691277-96) are used as a polyisocyanate in the composition. The content of isocyanate groups 29.5-31%.

As the organotin catalyst, tin octoate and tin dibutyldylaurinate (TU 6-02-818-78) are used, and other organotin compounds used for the synthesis of polyurethanes can be used.

As an isocyanate prepolymer, the “Trifol-M” brand prepolymer, SKU-PFL-100, SKU-PPT-4503, ADV-17, are used.

As an aromatic diamine in the composition, a mixture of 2,4- and 2,6-isomers of 3,5-dimethylthiotoluylene diamine in a ratio of 80:20, Etacure 300 brand, is used.

Additives may be added to the composition to give other advantages to the coating material. As a component that ensures a reduction in the composition’s consumption for manufacturing a unit of area, rubber crumb is used; pigments can be introduced into the composition to improve the appearance. For the manufacture of compositions for sports coatings, mixing equipment is used that provides homogenization with a degree of milling of solid particles of not more than 100 microns. The polyisocyanate and the urethane formation catalyst are supplied complete with the composition and added to it at the place of laying the coating. The crumb rubber is mixed into the composition before the introduction of the hardener.

The invention is illustrated by the following example 1 (composition 1, table 1).

Example 1. In a mixer with an anchor mixer of 0.05 L volume, 15 g of a polysulfide oligomer, 5 g of a trifunctional low molecular weight alcohol are charged and mixed for 10 minutes. The resulting mixture is unloaded into a glass and incubated for 30 minutes. At the same time, 100 g oligobutadiene diol PDI-IK, 70 g chalk, 10 g lime-screenings, 5 g dibutyl phenyl phosphate, 0.1 g tin octoate, 0.5 g 2,4,6-tri- tert-butylphenol, 10 g of the Trifol-M brand isocyanate prepolymer, 3 g of aromatic diamine, 30 g of diatomite. The components are mixed for 30 minutes, and then a seasoned mixture of polysulfide oligomer and trifunctional low molecular weight alcohol is added and mixed for another 10 minutes. To the resulting mixture was added 10 g of rubber crumb, 24 g of polyisocyanate and mixed again for 8 minutes. The resulting mixture is poured into molds and incubated for 20-25 days at a temperature of 18-25 ° C.

Similarly prepare compositions of composition 2-10 according to example 1.

The composition of all studied compositions is shown in table 1. The properties of the coating samples from the compositions are shown in table 2.

Coating samples were tested according to GOST 263-75, GOST-275-75, GOST 6950-73, GOST-2678-88 and methods (Kuvshinsky E.V., Sidorovich E.A. Pendulum elastomer KS. // Journal of Theoretical Physics, 1957 , T. 26, p. 878-886. Sidorovich. EA, Kuvshinsky EV Study of shock compression of rubbers. // Solid State Physics. 1961, V.3.11, p.3487-3494) and (Medvedev V .P. Development of elastomeric coatings for sports facilities based on the analysis of the interaction of elements in the system "musculoskeletal system of the athlete-coating. Diss. Candidate of Technical Sciences. Volgograd, 1989).

From the data of table 2 it is seen that the claimed composition provides coatings with a higher complex of dynamic and physico-mechanical characteristics. The increase in the complex of strength properties is achieved through the use of an isocyanate prepolymer in combination with aromatic diamine and diatomite.

table 2 Properties of compositions for sports coatings The name of indicators Indicator values Prototype RF patent 2325418 one 2 3 four 5 6 7 8 9 10 Hardness Shore A, conventional units 67 63 54 63 59 40 32 fifty 56 58 56 Conditional tensile strength, kgf / cm ² 3.6 3.4 3,5 3.4 3.4 1,2 0.57 2.0 3,1 2,8 3.3 Relative extension, % 230 200 210 200 210 130 347 55 210 200 220 Bounce Elasticity,% 58 49 fifty 47 40 thirty twenty 40 47 45 49 Dynamic modulus of elasticity, MPa 6.5 6.2 6.4 6.0 6.2 2,4 2.7 5,6 5.8 5,4 5.9 Mechanical loss tangent 0,110 0.102 0.104 0.108 0,120 0.318 0.302 0.351 0.119 0.114 0.108 The attenuation decrement of the oscillation system "sample-firing pin", ^-1 137 142 134 151 134 237 243 234 243 254 220 The ratio of relaxation time to impact time, τ / T 0.97 0.99 1.25 1.05 1.99 1.45 1.51 1,54 1,57 1.48 1.39

As can be seen from tables 1 and 2, when the content of the isocyanate prepolymer is less than 10 parts by weight the coating has a reduced level of complex properties due to a significant deviation of the NCO: OH ratio from equimolecularity and a decrease in the crosslink density. With large amounts of prepolymer, the properties also decrease due to an excess of isocyanate groups, a tendency to foam, and an increase in the rigidity of the cured product.

The amount of aromatic diamine (Etacure 300), as well as the amount of isocyanate prepolymer, has a significant effect on the properties of the coatings. When the content of Etacure 300 is less than 3 parts by weight the degree of crosslinking is reduced, the effect of increasing dynamic and physico-mechanical properties is not achieved.

Reducing and increasing the degree of filling of diatomite from the stated limits leads to a decrease in the level of properties of sports coatings due to an insufficient number of structural formations obtained during curing.

Thus, the advantage of using the proposed composition is to increase the dynamic and physico-mechanical characteristics of sports surfaces.

Claims (1)

Composition for sports coatings, including oligobutadiene diol, plasticizer, mineral filler, trifunctional low molecular weight alcohol, polymethylene polyphenylene polyisocyanate containing 29.5-31.0% isocyanate groups, an organotin catalyst, 2,4,6-tri-tert-butylphenol, polysulfide oligomer which additionally contains an isocyanate prepolymer, an aromatic diamine, which is a mixture of 2,4- and 2,6-isomers of 3,5-dimethylthiotoluylenediamine in a ratio of 80:20 and diatomite in the following ratio Comrade, parts by weight .:
Oligobutadiene diol one hundred Plasticizer 5-30 Mineral filler 80-100 Trifunctional low molecular weight alcohol 1-5 Specified Polyisocyanate 14-24 Organotin catalyst 0.01-1.10 2,4,6-tri-tert-butylphenol 0.5-1.5 Polysulfide oligomer 5-15 Isocyanate prepolymer 10-30 Specified Aromatic Diamine 3-6 Diatomite 10-30