Coating composition

FIELD: polymers, in particular resin compositions based on liquid hydrocarbon rubber useful in building industry for manufacturing of roofing and insulating coatings.

SUBSTANCE: claimed composition contains law molecular rubber isoprene-butadiene copolymer in monomer ratio of 20:80, having molecular weight of 3000-3500 and hydroxyl content of 0.7-1.1 mass %; polyisocyanate, waste from polycaproamide production, catalyst for urethane formation. Additionally composition may contain component moisture absorber, filler, plasticizer solvent, law molecular alcohol, antiaging agent pigment and surfactant.

EFFECT: coatings with decreased moisture absorption and increased aging resistance.

2 cl, 2 tbl

 

The invention relates to polymeric compositions based on liquid hydrocarbon rubbers designed for devices roofing and insulation coatings in construction.

Known composition for coating comprising a copolymer of butadiene and piperylene with a molecular mass of 1200-3200 and 500-1200, glycerin, polyisocyanate, catalyst retinoblastoma and rubber crumb (RF patent 1229214, MKI 09 D No.3 / 72, 1984).

The lack of coverage of this composition is relatively high water absorption.

Known composition for coating comprising a low molecular weight butadienestyrene rubber with a molecular mass of 1200-3200, glycerin polyisocyanate, catalyst retinoblastoma, gidrauxilirovaniu rubber crumb and calcium oxide (RF patent 2024564, 09 D 109/00, 1994).

The disadvantage of this composition is a high water absorption because of the wide molecular weight distribution and a low functionality butadienestyrene rubber.

Known composition for coatings, including butadienestyrene rubber, glycerin, polyisocyanate, catalyst retinoblastoma, calcium oxide, chalk, antioxidant - polymerization product of waste isoprene production stage of decomposition 4,4-dimethyldioxanes-1,3 (RF patent 1775447, 09 D 109/00. 1990).

The disadvantage of this composition is increased vodopogl the distribution.

The closest solution of the present invention to the technical essence is a composition for coating (patent RF 2186812, 09 D 109/00, 2000), comprising a copolymer of butadiene with isoprene ratio of monomers to 70:30, molecular weight 4000-5000, the content of hydroxyl groups of 0.75-0.89 wt.%, plasticizer, mineral filler, trifunctionally low molecular weight alcohol, a polyisocyanate, a catalyst retinoblastoma, 2,4,6-tri-tertbutylphenol and ethyl silicate of the following composition, parts by weight:

A copolymer of butadiene and isoprene100
The plasticizer5-30
Mineral filler90-150
Trifunctionally low molecular weight alcohol1-5
The polyisocyanate12-24
Catalyst retinoblastoma0,01-1,0
2,4,6-tri-tertbutylphenol0.5 to 1.5
Ethyl silicate0,8-1,6

The disadvantages of this composition are higher water absorption and lower resistance to aging. Increased water absorption caused by the structure and Monomeric composition of the rubber. Because of the wide molecular mass distribution of used rubber high content is non-functional and mono-functional macromolecules are not involved in the formation and creating defective crosslinked structure during curing of the composition.

The objective of the proposed technical solution is the creation of a composition having low water absorption, higher resistance to ageing.

The technical result is the reduction of water absorption and increase the resistance to ageing.

The technical result is achieved in that the composition for coating comprising a low molecular weight rubber, polyisocyanate, catalyst retinoblastoma, characterized in that it contains as low molecular weight rubber is a copolymer of isoprene with styrene in the ratio of monomers to 20:80, molecular weight 3000-3500, with a content of hydroxyl groups of 0.7-1.1 wt.%, and the composition further comprises a waste of the production of polycaproamide in the following ratio of components, parts by weight:

Low molecular weight rubber100
The polyisocyanate10-36
Waste production of polycaproamide0,5-40
Catalyst retinoblastomaof 0.001 to 3.0

Composition for coating additionally contains a component for moisture absorption, filler, plasticizer, solvent, low molecular weight alcohol, an antioxidant, a pigment, a surfactant.

The invention consists in ISOE is lovanii as the basis of the composition of low molecular weight hydroxyl-containing rubber SOPS-1K with a narrow molecular weight distribution, hence, higher functionality and more perfect distribution by type of functionality, in particular a lower content of non - and mono-functional macromolecules due to a higher proportion of bifunctional macrocephaly. This allows for a more dense and uniform mesh utverzhdenii composition for coating, which leads to the reduction of water absorption. Waste production of polycaproamide are low molecular weight impurities, separated by extraction with hot water from the polymer followed by evaporation of the resulting solution. This mixture oligohydraminos (89-94%), cyclic oligomers (1-3%) and ε-caprolactam (5-8%).

Due to the presence in the waste production of polycaproamide polar groups (amine, amide, carboxyl) increase the aging resistance, adhesion of the composition to various materials (concrete, steel). The polyisocyanate, reacting with amine and amide groups of waste forms additional crosslinking, thereby improving the rate of water absorption. However, the application of more than 40 parts by weight of waste production of polycaproamide in the composition leads to a sharp decrease of physico-mechanical properties.

The introduction of the catalyst retinoblastoma less than 0.001 parts by weight impractical due to long-time curing compositions for coatings. The increase is more than 3.0 parts by weight of reduces the pot life of the composition.

Reducing the number of MDI less than 10 parts by weight leads to the formation of laboratoy patterns and the formation of gel-like product. An increase of more than 36 parts by weight impractical because of the tendency to foaming during curing.

Low molecular weight rubber SOPS-1K is a copolymer of isoprene with styrene content of butadiene 80% (TU 38. 103342-88)obtained by polymerization in solution in a lithium catalyst by using a polymerization regulator trialkylamine. Has the following characteristics: molecular weight 3000-3500, the content of hydroxyl groups of 0.7-1.1 wt.%, the viscosity at 25°2,9-3,4 Pa.s, the glass transition temperature minus 64°With a density of 900 kg/m3the share of bifunctional macromolecules reaches 75%.

As MDI in the composition used polietilen-polyphenylisocyanate based on 4,4-diphenylmethanediisocyanate (TU 6-03-375-75, 113-03-38-106-90, 113-03-603-86, 2224-152-04691277-96) or their foreign equivalents: Desmodur, suprasec 5005, vortex DM-100 company Kunstman Polyurethane, Belgium with a content of isocyanate groups 29-32%.

As a catalyst retinoblastoma used tertiary amines or ORGANOMETALLIC compounds, such as triethylamine (GOST 9966-85), dimethylbenzylamine (TU 6-09-2974-78), dibutyltindilaurate tin (TU 6-02-818-73).

As real the environmental modifiers used surfactants, for example oleic or stearic acid or organopolysiloxane modifiers with the formula:

where R1is an alkyl, aryl, alkoxygroup with the number of carbon atoms up to 6;

R2is hydrogen, alkyl, aryl group with the number of carbon atoms up to 6;

n is chosen so that the molecular weight of organopolysiloxane was $ 200-2000, for example, polyethylsiloxane liquid PES-5; tetraethoxysilane (TU 6-00-5763445-14-90), ethyl silicate-32 (TU 6-02-895-86); ethyl silicate-40 (GOST 26371-84), which represents ethyl esters autokriminal acid and their mixtures with preparation, with a mass fraction of silicon dioxide 25-42%, a density of 0.93-1.07 g/cm3.

In the composition can be introduced components that do not affect the envisaged technical result, but gives the material covering other benefits. For example, facilitating the dispersion and reduce the time offset, in particular stearic, oleic acid, organic solvent (white spirit).

For the manufacture of a composition using mixing equipment to ensure homogenization MDI and catalyst in rubber, the dispersion of the powdery fillers and pigments, dissolving rubber in the plasticizer or plasticizer, antioxidants and additives in the rubber. Article the stump milling solids should not exceed 100 microns. An industrial application of the composition, the polyisocyanate supplied complete with song and give it directly before coating.

The invention is illustrated by the following example. In a mixer with anchor stirrer 1 liter load of 300 g of low molecular weight rubber SOPS-1K, 60 g of MDI, 0.3 g of catalyst retinoblastoma (dibutyltindilaurate tin), 15 g of finely ground waste production of polycaproamide, the mixture is stirred for 10 minutes. The resulting mass is poured to form and maintain at a temperature of not lower than 20°C for 3-5 days. The composition corresponds to example 1 in table 1.

Compositions containing fillers and other additives, in accordance with the invention is prepared as follows: in the mixer download prescription amount of rubber waste production of polycaproamide, fillers, pigments, antioxidants, component moisture absorption. The mass is stirred for 2 hours, add a plasticizer, a solvent, a low molecular weight alcohol and a catalyst retinoblastoma and again stirred for 20 minutes. Then faucet enter the polyisocyanate is added and stirred for 10 minutes. After applied on the mold for curing. Similarly prepared composition of the prototype.

Testing of the coating material is conducted according to GOST 263-93, GOST 270-75, GOST 426-6.

Properties of the samples of the coatings are shown in table 2.

From table 2 it is seen that the use as a binder of low molecular weight rubber declared copolymer of isoprene to butadiene in combination with waste production polycaproamide, polyisocyanate and catalyst retinoblastoma provides receive coverage with low water absorption and high resistance to ageing than the prototype. The combination with a filler, component moisture absorption and organopolysiloxane modifiers enhances the effect of reducing water absorption. Also coatings have higher physical and mechanical properties compared to the prototype.

Coatings of compounds 14-16 have the worst indicators of properties that is associated with the deviation of the content of the components of the composition from optimal.

Thus, the claimed composition for coating has low water absorption and high resistance to ageing.

Table 1
Name of the componentComposition, parts by weightThe prototype Pat. RF 2186812
12345678 910111213141516
1. A copolymer of isoprene and butadiene ratio of monomers to 20:80, mol. mass 3000-3500100100100100100100100100100100100100100100100100
2. A copolymer of isoprene and butadiene ratio of monomers to 30:70, mol. mass 4000-5000100
3. Filling:
chalk15015015015020018015015028010090
kaolin100100
barite250
4. The plasticizer
chloroparaffin CP-470#x0200A; 808080909080120
the dioctylphthalate3030
white spirit1055
oil Naloxol100
oil MP&x0200A; 90
5. Low molecular weight alcohol:
glycerin133333433310
trimethylolpropane231
triethanolamin3
6. The polyisocyanate202020222426322236222236164010912
7. The desiccant
calcium oxide520101010101510101010
cement 1010

5
12345678910111213141516The placeholder
gypsum1010
8. Catalyst retinoblastoma0,10,250,250,51,00,50,53,00,0010,51,01,00,053,50,0010,00050,01
9. Waste production of polycaproamide11010102040105101520,55150
10. Pigment510,51055
11. Antioxidant:
2,6-Ditretbutyl-4-METHYLPHENOL12
product 2246 /td> 10,5
2,4,6-Titlebuy-phenol1,5
NOx modifiers110,551,516
13. Ethyl silicate1,0
Notes:

1. In SOS is avah 1-4, 6, 7, 9, 10, 13, 15, 16 in the prototype used dibutyltin tin in the composition of 5,11,14-dimethylbenzylamine, in part 8,12 - triethylamine.

2. In compounds 9, 10 used pigment zelenoliky, consisting of 7 - pigment red brand 4C, compounds 6, 12 - chromium oxide with 8 - phtalocyanine blue.

3. In compounds 1-4 and the prototype was used polyisocyanate based on 4, 4-diphenylmethanediisocyanate, compounds 5-7 were used Desmodur, in compositions for 8-10 suprasec 5005, compounds 11-16 - Vortex DM-100.

4. Part 8 used polyethylsiloxane liquid PES-5, part 11 - tetraethoxysilane in the structure of 10 - ethyl silicate 32, part 9, 14 - ethyl silicate 40, part 5 - stearic acid, with 6 - oleic acid.

61td align="center"> 1,0
Table 2
IndicesPropertiesThe prototype Pat. RF 2186812
12345678910111213141516
Hardness shore a, $42475063664770737065756238531042
Conventional strength, kg/cm2899151614823211717202281228
Ball rebound resilience, %405358454544404535364040423032830
The ageing factor strength0,880,900,920,960,960,970,880,950,880,950,960,980,900,70,830,50,88
Water absorption, %0,80,81,00,981,01,22,01,11,01,00,961,12,02,22,52,6

1. Composition for coating comprising a low molecular weight rubber, polyisocyanate, catalyst retinoblastoma, characterized in that it contains as low molecular weight rubber is a copolymer of isoprene with styrene at a ratio of monomers of 20:80 molecular weight 3000-3500, with a content of hydroxyl groups of 0.7-1.1 wt.%, and the composition further comprises a waste of the production of polycaproamide in the following ratio of components, parts by weight:

Low molecular weight rubber100
The polyisocyanate10-36
Waste production of polycaproamide0,5-40
Catalyst retinoblastomaof 0.001 to 3.0

2. Composition for coating according to claim 1, characterized in that it further comprises a component for moisture absorption, filler, plasticizer, solvent, low molecular weight alcohol, an antioxidant, a pigment, a surfactant.



 

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