RU2451047C1 - Coating composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: coating composition contains: oligobutadiene diol, glycerine, mineral filler, polyisocyanate, organotin catalyst, 2,4,6-tri-tert-butylphenol, ethyl silicate, polysulphide oligomer - liquid thiocols with number-average molecular weight 1700-5500 and viscosity at 25°C of 7.5-50 Pa·s, zinc oxide, diatomite, modifying additive - polyfluorinated alcohols - telomers of general formula H(CF₂-CF₂)_nCH₂OH, where n=4-8.

EFFECT: high sedimentation resistance of the composition, dynamic and physical-mechanical, adhesion properties of the coating.

2 tbl

Description

The invention relates to methods for producing compositions intended for the manufacture of coatings for athletics treadmills, gyms, playgrounds, as well as roofing and waterproofing coatings.

A known composition for the manufacture of elastic coatings, including 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 of the type of functionality of the butadiene-piperylene oligomer causes a defectiveness of the three-dimensional network formed during its curing with 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 a hydroxyl-containing copolymer of polybutadiene and isoprene, a plasticizer, a mineral filler, a trifunctional low molecular weight alcohol, polyisocyanate, a urethane formation catalyst and 2,4,6-tri-tert-butylphenol [RF patent 2186812 C2, cl. 7 C09D 109/00, publ. 2002].

The disadvantage of the composition is the low sedimentation stability. The coating obtained from this composition is characterized by a low level of dynamic and physical-mechanical properties.

Closest to the proposed technical essence and the achieved result is a composition comprising oligobutadiene diol, plasticizer, mineral filler, polyisocyanate, organotin catalyst and 2,4,6-tri-tert-butylphenol, ethyl silicate, and it additionally contains a polysulfide oligomer - liquid thiocols with number average molecular weight of 1700-5500 and a viscosity at 25 ° C of 7.5-50 Pa · s, zinc oxide, diatomite, a surfactant in the following ratio of components:

Oligobutadiene diol 100

Glycerin 5-20

Mineral filler 60-100

Polyisocyanate 14-24

Organotin catalyst 0.01-1.10

2,4,6-Tri-tert-butylphenol 0.5-1.5

Ethyl silicate 0.8-1.6

Polysulfide oligomer 5-15

Zinc oxide 10-20

Diatomite 20-30

Surfactant 4-6

[RF patent 2331661, class 7 C09D 175/08, publ. 2008].

The disadvantage is the low level of dynamic and adhesive properties. The sodium salts of recinoleic acids of the C17-C19 fraction, which are used as a surfactant, are not able to integrate into the polymer matrix and are extracted during the operation of the polymer coating, which negatively affects the operational properties of the material.

The objective of the invention is to obtain coatings with improved dynamic characteristics and increased adhesive properties.

The technical result is solved by using a composition including oligobutadiene diol, glycerin, mineral filler, polyisocyanate, organotin catalyst, 2,4,6-tri-tert-butylphenol, ethyl silicate, and it additionally contains a polysulfide oligomer, zinc oxide, diatomite, modifying additive - polyfluorinated telomeric alcohols of the general formula H (CF ₂ —CF ₂ ) _n CH ₂ OH, where n = 4-8, in the following ratio of components, parts by weight:

Oligobutadiene diol 100

Glycerin 5-20

Mineral filler 60-100

Polyisocyanate 14-24

Organotin catalyst 0.01-1.10

2,4,6-Tri-tert-butylphenol 0.5-1.5

Ethyl silicate 0.8-1.6

Polysulfide oligomer 5-15

Zinc oxide 10-20

Diatomite 20-30

Modifying additive 0.4-0.6

The essence of the proposed method for producing the composition is as follows. In terms of solubility, polysulfide oligomers occupy an intermediate position between oligodienediols and triols. Preliminary mixing of the polysulfide oligomer with glycerol makes it possible to obtain a homogeneous mixture that is well compatible with the oligodienediol binder. When the composition is cured, a regular network structure with a narrow molecular weight distribution of interstitial chains is formed. In addition, the sulfhydryl groups of the polysulfide oligomer interact with the polyisocyanate, which leads to additional crosslinking of the elastomeric matrix. The introduction of zinc oxide in the composition increases the degree of conversion of the mercapto groups of the polysulfide oligomer and the double bonds of oligobutadiene diol. The use of diatomite, which contains a significant amount of bound water (from 3-15 wt.%), Which has a developed surface and alkaline reaction of aqueous extract, contributes to a more efficient oxidation of mercapto groups of the polysulfide oligomer and an increase in the physicomechanical properties of the coating. The use of a modifying additive allows to increase the processability, adhesive indicators and sedimentation stability of the composition by increasing the adsorption interaction at the oligomeric binder-solid phase interface.

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 3000-3500; the content of hydroxyl groups, wt.%, 0.75-0.89 and oligobutadiene diols 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 (oligobutadiene diols Krasol LBH manufactured by Sartomer).

Fillers of the composition are mineral powders of medium dispersion, for example chalk, lime-screenings, kaolin, talc.

2,4,6-Tri-tert-butylphenol is a crystalline powder with a greenish-yellow tint, is 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).

Ethyl silicate (TU 6-02-895-86) is a mixture of esters of orthosilicic acid. It is a reaction product of ethyl alcohol with silicon tetrachloride. It has the following characteristics: density, kg / m ³ - 955-990; mass fraction of silicon dioxide,% - 31-34; mass fraction of tetraethoxysilane,% - 50-60; optical density at a wavelength of 600 nm - 0.3-0.4.

Glycerin (GOST 6259-75) is a low molecular weight tri-functional alcohol that is used as a plasticizer and also acts as a branching agent.

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 dibutyl dilauurinate (TU 6-02-818-78) are used, and other organotin compounds used for the synthesis of polyurethanes can be used.

As the polysulfide oligomer, 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).

Zinc oxide (GOST 202-84) is used as a hardener and filler.

Diatomite (TU 5761-001-25310144-99) is a light porous rock from white to yellowish-gray. The average density of diatomite ranges 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 modifying additive, an industrial product was used, which is a mixture of solid, polyfluorinated telomeric alcohols synthesized by the radical telomerization mechanism of tetrafluoroethylene in methyl alcohol (TU 301-14-1-89), with the general formula:

H (CF ₂ CF ₂ ) _n CH ₂ OH, where n = 4-8.

Additives may be added to the composition to give other advantages to the coating material. As a component that ensures a reduction in the consumption of the composition for the manufacture of a unit of coating area, rubber crumb is used. To improve the appearance of the composition can be introduced pigments.

For the manufacture of the composition, mixing equipment is used to ensure a homogeneous suspension of the filler in the volume of the composition with a milling degree of solid particles of not more than 100 microns. Polyisocyanate, zinc oxide and an organotin 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 composition and properties of the composition are shown in tables 1 and 2.

Example 1. The introduction of the components of the composition is as follows. 100 g of Krasol oligobutadiene diol with a molecular weight of 2000% and a hydroxyl content of 1.7%, 5 g of glycerol, 15 g of a polysulfide oligomer — brand I thiol, 0.4 g of a modifying additive, 50 g of chalk, are loaded into a mixer with a volume of 1 l; 10 g of lime screenings, 0.1 g of tin octoate, 0.5 g of 2,4,6-tri-tert-butylphenol, 0.8 g of ethyl silicate, 30 g of diatomite. The mixing of the components is carried out for 3 hours. To the resulting mixture was added 10 g of rubber crumb and stirred for 30 minutes, then 24 g of polyisocyanate, 20 g of zinc oxide were added and mixed again for 8 minutes. The resulting mass is poured into molds and incubated for 20-25 days at a temperature of 18-25 ° C.

Similarly, the compositions are prepared according to examples 2-10.

An example of a prototype. The introduction of the components of the composition is as follows. 100 g of Krasol oligobutadiene diol with a molecular weight of 2000% and a content of hydroxyl groups of 1.7%, 20 g of glycerol, 10 g of a polysulfide oligomer - brand I thiol, 6 g of surfactant, 100 g of talc are loaded into a mixer with a 1 liter volume; 1.5 g of 2,4,6-tri-tert-butylphenol, 1.6 g of ethyl silicate and 30 g of diatomite. The resulting mixture was stirred for 30 minutes, then 16 g of polyisocyanate, 15 g of zinc oxide and 0.03 g of tin dibutyl disurethane were added, and again stirred for 8 minutes. The resulting mass is poured into molds and incubated for 20-25 days at a temperature of 18-25 ° C.

Coating samples are tested according to GOST 263-75, GOST 275-75, GOST 6950-73, GOST 2678-88, GOST 26578-85. The dynamic modulus of elasticity and the dielectric loss tangent are determined by the method of single shock compression on a pendulum elastometer (see Kuvshinsky E.V., Sidorovich E.A. Pendulum elastometer KS // Journal of Theoretical Physics, 1957. V.26. 4, p.878 -886. Sidorovich EA, Kuvshinsky EV Study of shock compression of rubbers // Solid State Physics. 1961. V.3. 11, p.3487-3494). Ball rebound tests are performed according to DIN 18035, part 6, by determining the ratio of the ball rebound height from the coating compared to the concrete floor.

Sedimentation stability was evaluated by the following method. The composition immediately after manufacture was poured into cylinders with a volume of 100 cm ³ . The cylinders were kept at a temperature of 45 ± 2 ° C for 60 days. After a specified exposure time, the top layer of the composition in the amount of 40 ml was selected. The sample was dissolved in white spirit and the solution was centrifuged until the solid phase was completely separated, the content of which was determined by the gravimetric method. Next, the amount of solid phase φ remaining in the selected layer was calculated: φ = x ₁ / x ₀ , where x ₀ is the content of fillers in the freshly prepared composition, wt.%, X ₁ is the content of fillers in the selected layer after holding the composition, wt.%.

As can be seen from tables 1 and 2, when the content of the polysulfide oligomer is less than 5 parts by weight the effect of increasing dynamic and physico-mechanical properties is not achieved. When the concentration of the polysulfide oligomer is more than 15 parts by weight the coating has a reduced level of complex properties due to the competing reaction of the sulfhydryl groups of the polysulfide oligomer and the hydroxyl groups of the oligodienediol with the polyisocyanate.

The use of plasticizer less than 5 wt.h. leads to a deterioration in processability, a decrease in the strength and deformation properties of coatings. With an increase in the concentration of plasticizer more than 20 parts by weight strength properties of coatings are reduced.

When the content of polyisocyanate is less than 14 parts by weight strength properties of the coating are reduced. The excess content of polyisocyanate over 24 wt.h. leads to foaming of the composition.

Using less than 0.01 parts by weight Organotin catalyst leads to a decrease in the curing rate of the composition. When the content of the urethane catalyst is more than 1.10 parts by weight decreases the viability of the compositions.

When the concentration of the mineral filler is less than 60 parts by weight the strength properties of the coating material are reduced. Using more than 100 parts by weight the amount of zinc oxide reduces the elongation of the cured material.

When the content of 2,4,6-tri-tert-butylphenol is less than 0.5 parts by weight the resistance of the coating to atmospheric aging is reduced. The use of 2,4,6-tri-tert-butylphenol in an amount of more than 1.5 parts by weight reduces the resistance to weathering.

The use of ethyl silicate in an amount of less than 0.8 wt.h. leads to a decrease in the dynamic performance of the coating. When using more than 1.6 parts by weight the amount of ethyl silicate decreases the strength properties of the coating.

When the concentration of zinc oxide is less than 10 parts by weight the strength properties of the coating material are reduced. Using more than 20 parts by weight the amount of zinc oxide reduces the elongation of the cured material.

The use of diatomite in an amount of less than 20 wt.h. leads to a decrease in hardness of the coating. When the concentration of diatomite more than 30 parts by weight strength properties of the coating are reduced.

When the concentration of the modifying additive is less than 0.4 wt.h. the sedimentation stability of the composition decreases. Using more than 0.6 parts by weight the amount of modifying additives leads to a decrease in the strength properties of the coating.

Table 1 Name of components Composition, parts by weight Prototype, US Pat. 2331661 one 2 3 four 5 6 7 8 9 10 Oligobutadiene Diol: PDI-1K - one hundred - - - - - - one hundred - - Krasol LBH one hundred - one hundred one hundred one hundred one hundred one hundred one hundred - one hundred one hundred Mineral filler: - a piece of chalk fifty - - 80 90 120 - - - 80 - - lime screenings 10 - - twenty - - - - - twenty - - kaolin - one hundred - - - - 120 - one hundred - - - talc - - one hundred - - - - 60 - - one hundred Plasticizer 5 fifteen twenty twenty twenty 40 2.5 fifteen fifteen twenty twenty Triethanolamine - - - - - - - - - - - Tin Octoate 0.1 - - - 0.05 - 0.10 0.15 - - - Tin Dibutyl Dilaurate - 0.01 0,03 1.10 - 0.005 - - 0.01 1.15 0,03 2,4,6-Tri-tert-butylphenol 0.5 1,0 1,5 1,0 0.5 1,0 0.25 2.0 1,0 1,0 1,5 Ethyl silicate 0.8 1.3 1,6 0.9 1.4 0.8 0.4 1,5 2.5 1,6 1,6 Rubber crumb 10 - - - 10 - - - - - - Pigment red C - 5 - 5 - - - - 5 5 - Polyisocyanate 24 twenty 16 16 fourteen 16 10 28 twenty 16 16 Polysulfide oligomer fifteen fifteen 10 10 5 2.5 25 5 fifteen 10 10 Zinc oxide twenty fifteen fifteen 10 10 fifty 5 fifteen fifteen twenty fifteen Diatomite thirty twenty thirty 25 twenty 25 twenty 5 fifty 10 thirty Surface-active substance - - - - - - - - - - 6 Modifying additive 0.40 0.45 0.50 0.60 0.35 0.60 1.00 0.50 0.05 0.35 - Note: 1. As a plasticizer in examples 1-10, glycerol is used, in the prototype - chloroparaffin HP-470. 2. The molecular weight / content of hydroxyl groups (%) of oligobutadiene diol Krasol LBH in the examples is: in examples 1, 2 - 2000 / 1.70, 3 and prototype - 3000 / 1.3; in examples 4, 6, 10 - 4000 / 0.85; in examples 5, 7 - 5000 / 0.70; in examples 8, 9 - 1500 / 2.30. 3. As a polysulfide oligomer in examples 1, 7, 8, brand I thiocol is used, in examples 2, 3, 5, 10 - brand II thiocol, in examples 4, 6, 7, 9 - brand NVB-2 thiocol. 4. As a modifying additive in examples 1-10, polyfluorinated telomeric alcohols were used, as the surfactant in the prototype, sodium salts of reacionic acids of the C17-C19 fraction were used.

table 2 Coverage Ratios Indicator values Prototype, US Pat. 2331661 one 2 3 four 5 6 7 8 9 10 The amount of solid phase in the sample,% 90 88 90 87 88 68 65 85 69 85 90 Shore A hardness, arb. 77 83 80 73 75 63 62 70 70 58 83 Conditional Strength, MPa 3.4 3.4 3,1 3,5 3,1 1,1 0.8 3,7 2,8 3.0 3.3 Relative extension, % 215 235 217 227 185 one hundred 370 165 187 213 220 Bounce Elasticity,% 57 53 51 fifty 49 33 31 48 45 41 52 Dynamic modulus of elasticity, MPa 7.0 6.9 6.8 6.7 6.4 4,5 3.6 3,7 6.5 6.6 5.9 Mechanical loss tangent 0,110 0.127 0.123 0,120 0.113 0.205 0.325 0.165 0.170 0.115 0.106 Basketball Rebound,% 125 119 112 117 111 95 79 102 112 113 110 Bounce the tennis ball,% 122 118 122 115 109 82 62 104 110 111 123 Adhesive bond strength at separation, MPa - from concrete 3.0 2,8 2.5 2,3 2,3 0.7 0.5 2.7 2,4 2.0 2.0 - from a tree 2.0 1.8 1,6 1.7 1,6 0.5 0.3 1,6 1.3 1,2 1.3

Thus, the proposed composition is characterized by increased sedimentation stability and allows you to get elastic coatings with improved dynamic, adhesive and physico-mechanical characteristics, compared with the prototype.

Claims (1)

Coating composition, including oligobutadiene diol, glycerin, mineral filler, polyisocyanate, organotin catalyst, 2,4,6-tri-tert-butylphenol, ethyl silicate, polysulfide oligomer - liquid thiocols with a number average molecular weight of 1700-5500 and viscosity at 25 ° C , 5-50 Pa · s, zinc oxide, diatomite, characterized in that the composition further comprises a modifying additive - polyfluorinated alcohols - telomeres of the general formula H (CF ₂ -CF ₂ ) _n CH ₂ OH, where n = 4-8, at the following ratio of components, parts by weight:
Oligobutadiene diol one hundred Glycerol 5-20 Mineral filler 60-100 Polyisocyanate 14-24 Organotin catalyst 0.01-1.10 2,4,6-tri-tert-butylphenol 0.5-1.5 Ethyl silicate 0.8-1.6 Polysulfide oligomer 5-15 Zinc oxide 10-20 Diatomite 20-30 Modifying additive 0.4-0.6