RU2503698C1 - Coating composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: coating composition contains a plasticiser, chalk, glycerine, polyisocyanate, dibutyltin dilurate and a product of copolymerisation of 20-50 pts.wt styrene with 100 pts.wt hydroxyl-containing butadiene low-molecular weight rubber NISSO PB G3000, which is obtained in a plasticiser medium in the presence of a peroxide initiator.

EFFECT: invention increases strength, hardness and relative elongation of coatings.

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Description

The invention relates to compositions based on liquid hydrocarbon rubbers for the manufacture of sports field coatings, floors, roofing and waterproofing coatings.

A known coating composition, including oligodienediol - isoprene-butadiene copolymer, plasticizer, filler, trifunctional low molecular weight alcohol, urethane formation catalyst, 2,4,6-tri-tert-butylphenol, hardener polyisocyanate and additionally ethyl silicate (see patent RF 2186812, C09D 109/09/09/09/00 Publish. 08/10/2002).

Known composition for coatings, including low molecular weight hydroxyl-containing rubber - a copolymer of isoprene and butadiene, polyisocyanate, a urethane formation catalyst, desiccant, filler, plasticizer, low molecular weight alcohol, pigment, alkyl phenol antioxidant and rheological additive (see Patent No. 09/09/196, RF Patent No. 22/178, No. 229, patent no. November 27, 2006, bull. No. 2).

The disadvantage of these compositions is the low strength of the cured elastomeric coatings.

A known composition for coatings, including oligobutadiene diol, a plasticizer, a mineral filler, a trifunctional low molecular weight alcohol, a urethane formation catalyst, 2,4,6-tri-tert-butylphenol, polyisocyanate and ethyl silicate (see RF patent 2190002, C09D 175/08. Publish. 09.27.2002. )

The disadvantage of this composition is the low strength of the elastomeric material for coatings.

The closest solution to the proposed invention (prototype) is a composition (see RF patent 2434916, C09D 175/14, C09D 109/00. Publ. 11/27/2011), including isocyanate hardener - polyisocyanate, urethane formation catalyst, plasticizer, antioxidant and base, hydroxyl-containing polybutadiene rubber of the microstructure,%: 1,4-trans 10-15, 1,2-units 85-90, molecular weight 1250-3200 and the content of hydroxyl groups of 0.82-2.36%, with a ratio of components, mass.h .:

The specified hydroxyl-containing polybutadiene rubber one hundred Isocyanate Hardener - Polyisocyanate 10-36 Urethane Catalyst 0.001-3.0

Additionally, the composition may contain: trifunctional low molecular weight alcohol (1-16), a plasticizer (dibutyl phthalate, chlorine paraffin HP-470, petroleum oils of netoxol or PM oil), a filler (chalk, lime screenings, calcium oxide, dolomite flour, granular rubber), antioxidant (2,6-ditretbutyl-4-methylphenol (agido-1), 2,4,6-tritretbutylphenol, 2,2-methylene-bis- (4-methyl-6-tert-butylphenol).

Coatings from this composition are characterized by an insufficient level of strength properties.

The technical result of the present invention is to increase the level of strength properties, especially the strength of the coating.

The technical result is achieved in that the composition for coatings based on hydroxyl-containing butadiene low molecular weight rubber brand NISSO PB G3000, including plasticizer, chalk, glycerin, polyisocyanate, tin dibutyl dilaurate, characterized in that the rubber contains a copolymerization product of 20-50 wt. . styrene with 100 parts by weight hydroxyl-containing butadiene low molecular weight rubber brand NISSO PB G3000 previously obtained in a plasticizer medium in the presence of peroxide initiator in the following ratio of components, parts by weight:

the specified hydroxyl-containing copolymerization product low molecular weight butadiene NISSO PB G3000 rubber with styrene 190-270 a piece of chalk 150-250 glycerol 2-4 polyisocyanate 17-26 tin dibutyldylaurinate 0.01-0.1

The essence of the invention is to use as the basis of the composition of the copolymer of hydroxyl-containing butadiene low molecular weight rubber brand NISSO PB G3000, molecular weight 2600-3200, the content of hydroxyl groups 0.88-0.94% wt., The content of 1,2-units mm 90% (http : //www.Nisso PB.com) with styrene.

To obtain a copolymerization product of hydroxyl-containing rubber with styrene, a reaction was carried out with different ratios of styrene and low-molecular weight hydroxyl-containing butadiene rubber NISSO PB G3000 in a plasticizer in the temperature range 110-130 ° C for 1.5-2 hours. The ratios of the reagents are given in the table. The copolymerization of styrene with hydroxyl-containing rubber was initiated by peroxide initiators (dilauryl peroxide, ditretbutyl peroxide) with a concentration of 0.2-0.4% by weight. by weight of the mixture. The advantage of copolymerization in a plasticizer environment, which is a necessary component of a polymer composition at the stage of its industrial use, is the ability to avoid polymer drying and solvent stripping during polymerization in it.

The use of a rubber copolymerization product with more than 50 parts by mass of styrene in the composition leads to a sharp decrease in physicomechanical properties, less than 20 parts by mass. does not affect the properties of the composition.

The introduction of a low molecular weight trifunctional alcohol serves to further increase the strength due to additional hydroxyl groups, branching vulcanization structures and increasing the density of crosslinking. Polyols with at least two hydroxyl groups, such as glycerin (GOST 6824-96), can be used as a low molecular weight trifunctional alcohol.

As a plasticizer were used:

- netaxol oil - softener oil of petroleum origin (TU 38.101999-84);

- chlorine paraffin brand ХП-470 (TU 6-09-563) - a liquid product of the chlorination of hydrocarbons with a chlorine content of 45-47%. Flavourless oily liquid, dark color;

- dibutyl phthalate (GOST 8728-88) is a low-viscosity homogeneous transparent liquid of a weak yellowish tint.

Polyisocyanates, in particular polymethylene phenyl isocyanates based on 4,4'-diphenylmethanediisocyanate (TU-6-03-375-75, 113-03-38-106-90, 113-03-603-86, 2224-152, are used as isocyanate hardener -04691277-96) or their imported analogues: desmodur, suprasek 5005, MR200 million and others with the content of isocyanate groups 29-32%.

As a catalyst for urethane formation, tin dibutyldylaurinate is used (TU-6-02-818-73),

For the manufacture of the coating composition, mixing equipment is used to ensure uniform distribution of the polyisocyanate and urethane formation catalyst in the rubber and to obtain a homogeneous mixture.

The invention is illustrated by the following example (composition 1, table). 200 g of a copolymerization product of rubber with styrene, 200 g of chalk, 3 g of glycerol and 0.01 g of a urethane-forming catalyst, tin dibutyl dilaurate, are loaded into a mixer with a 1 L volume mixer. Stirred for 5 minutes until smooth, then add a weighed portion of 21 g of polyisocyanate and mix again for 5 minutes.

The resulting mixture is applied to flat forms and kept at a temperature of at least 20 ° C for 3-5 days.

Similarly prepare compositions of other compositions and the prototype. Coating samples were tested according to GOST 263-93, GOST-270-75.

The composition and properties of the compositions Name of components and indicators Composition, parts by weight and properties Prototype, RF patent No. 2434916 one 2 3 four 5 6 7 8 9 10 No. 2434916 Rubber Nisso RV G3000 one hundred The copolymerization product of rubber with styrene, composition: 200 190 230 270 230 230 230 210 150 310 1) Nisso PB G3000 one hundred one hundred one hundred one hundred one hundred one hundred one hundred one hundred one hundred one hundred 2) styrene twenty thirty fifty fifty fifty fifty fifty thirty 10 80 3) netoxol oil 80 60 80 80 40 110 4) chloroparaffin brand HP-470 120 80 130 5) dibutyl phthalate 80 80 a piece of chalk 200 210 250 250 150 120 200 200 one hundred 300 190 Glycerol 3 2 3 3 four 2 3 3 one 5 2 Polyisocyanate 21 17 21 21 26 17 21 21 12 33 17 J Tin Dibutyl Dilaurate 0.01 0.01 0.01 0.01 0.01 0.1 0.01 0.01 0.2 0.005 0.01 Tear Resistance, kgf / cm ² 17 23 twenty 16 22 twenty 26 19 8 eleven 12 Relative extension, % 110 120 105 120 110 one hundred 110 110 one hundred 80 one hundred Shore A hardness, arb. 66 64 65 58 64 62 62 65 40 42 42 Note: As an initiator in examples 1, 2, 8 - dilauryl peroxide, in the remaining examples - ditretbutyl peroxide

From the data of the table it can be seen that the claimed composition improves the strength of the coatings.

Compositions for coatings of compositions 9-10 have lower strength, which is associated with a deviation of the content of the components from the optimal amounts.

A polyisocyanate content of less than 17 parts by weight leads to a decrease in the level of the complex of strength properties due to a significant deviation of the NCO: OH ratio from stoichiometric and a decrease in the crosslink density. With large quantities of polyisocyanate more than 26 parts by weight strength properties are also reduced due to the excess of isocyanate groups, the tendency to foaming and increase the rigidity of the cured product.

The amount of urethane formation catalyst has practically no effect on the physicomechanical characteristics and only controls the cure rate of the compositions.

An increase in the degree of filling creates difficulties in mixing and forming a monolithic structure of the coating due to the large proportion of dry components. Mixing is also hindered with small amounts of plasticizers, and the upper limit of plasticizers is limited by compatibility with polymers.

Thus, the advantage of coatings from the proposed composition is higher strength, hardness and elongation, which serves to increase the service life.

Claims (1)

Composition for coatings based on hydroxyl-containing butadiene low molecular weight rubber, including plasticizer, chalk, glycerin, polyisocyanate, tin dibutyl dilaurate, characterized in that the rubber contains a copolymerization product of 20-50 wt.h. styrene with 100 parts by weight hydroxyl-containing butadiene low molecular weight rubber brand NISSO PB G3000, previously obtained in the medium of a plasticizer in the presence of peroxide initiator in the following ratio, wt.h .:
the specified hydroxyl-containing copolymerization product low molecular weight butadiene NISSO PB G3000 rubber with styrene 190-270 a piece of chalk 150-250 glycerol 2-4 polyisocyanate 17-26 Tin Dibutyl Dilaurate 0.01-0.1