Polymer composition for protective and decorative coatings

 

(57) Abstract:

Composition as a film-forming contains the waste production of polystyrene emulsion metol, containing 97% of polystyrene and 3% of sodium oleate as an emulsifier, and low-molecular epoxygenase oligomer. The composition includes a plasticizer - esters of phthalic acid, a solvent mixture of ethyl acetate and toluene in their mass ratio of 1:(3 - 4) and the hardener is a mixture of polyamine selected from the group comprising Diethylenetriamine, Triethylenetetramine, polyethylenepolyamine, and product hydrolytic polycondensation - aminopropyltriethoxysilane in cyclohexanone brand ASOT-2 in their mass ratio of 1:(to 8.1 and 10.3). Based on the compositions have an oil-, gasoline-, acid - and alkali-resistant coatings for metal, wood and concrete. table 2.

The invention relates to the production of oil-, gasoline-, acid - and alkali-resistant coatings on metal, wood and concrete in industry and in everyday life.

Known composition using polystyrene (SU, ed. St. 1219629, class C 08 L 25/06, 1986), in which to improve adhesion to metal surfaces injected epoxy resin of the following composition, wt.h.:

Block-polystyrene-oligomyrmex(naproxin) - 3,0 - 4,0

Known also selected for the prototype polymeric composition based industrial polystyrene (SU, ed. St. 1599411, class C 09 D 129/00, 1990), containing a plasticizer, a pigment, a filler and an organic solvent, and uglevodorodyonogo resin under the following ratios, wt.%:

Styracaceae film-forming - 17 - 22

Polymers benzene separation (plasticizer) - 2,3 - 6,5

Uglevodorodnaya resin - 2,5 - 5,5

Pigment - 3,0 - 9,8

Filler - 0,7 - 12,5

Organic solvent - Rest

The composition has good physical and mechanical properties and chemical resistance, but it uses industrial grade polystyrene, as well as components, are difficult for mass production.

The objective of the invention is to develop a composition with good physico-mechanical properties and chemical resistance, but on the basis of more cheap and available raw materials.

This object is achieved by the development of polymeric compositions for protective and decorative coatings containing film-forming, plasticizer, filler, pigment, solvent and hardener. As a film-forming it is irola and low-molecular epoxy oligomer, as the plasticizer - esters of phthalic acid, the solvent is a mixture of ethyl acetate with toluene at a mass ratio of 1: (3 - 4), as a hardener - mixture polyamine selected from the group of polyethylenepolyamines (polyethylenepolyamine, Diethylenetriamine, Triethylenetetramine) with the product of hydrolytic polycondensation - aminopropyltriethoxysilane in cyclohexanone brand ASOT-2 at a mass ratio of 1:(to 8.1 and 10.3) with following contents of the source components. wt.%:

Waste polystyrene - 16,0 - 22,0

Epoxy oligomer - 3,1 - 4,0

Plasticizer - 1,9 - 2,7

Filler - 1,0 - 3,9

Pigment - 3,6 - 7,75

Solvent - 61,6 - 66,8

Hardener - 2,0 - 2,55

As the basis of the composition used polystyrene with = 640000 - 720000 in the form of waste emulsion of polystyrene, representing wet pieces white color remaining after cleaning the reactor. They contain from 0 to 55% water, depending on the duration and conditions of storage and the remains of the emulsifier in an amount of 0.4 to 3.0%. Perhaps the use of waste polystyrene obtained in other ways.

As epoxy oligomer use any industrial epoxygenase resin: ED-20 ED-16, e-40, etc.

As a curing agent, a mixture of polyamine selected from the group of polyethylenepolyamines normally used for curing epoxygenase oligomers: polyethylenepolyamine (Pepa), Diethylenetriamine (DETA), triethylenediamine (THETA), developed earlier by the product of hydrolytic polycondensation-aminopropyltriethoxysilane in cyclohexanone manufactured under the brand of ASOT-2 (TU 6-02-1250-83).

When using dry waste produce dissolution in a solvent mixture of ethyl acetate-toluene in the ratio of 1:(3 - 4) by weight. When using wet waste their dewatering is in the process of preparation of the composition. Dissolution is performed in toluene with simultaneous removal of the toluene azeotrope with water, and then diluted with ethyl acetate to the desired concentration.

Example 1. 44 kg of waste polystyrene with a humidity of 50% is loaded into the reactor with a heater and an anchor stirrer, equipped with a condenser and a separator vessel, and add 49 kg of toluene. The separation vessel is filled with toluene. The temperature in the reactor was raised to 110^oC and produce the azeotrope distillate toluene-water to the lack of water in the sample of the distillate from the separation vessel. At the end of the distillation temperature is Alicia residual emulsifier in the waste.

At the end of the distillation the water temperature in the reactor was lowered to 70^oC add 12.6 kg of ethyl acetate and produce the final dissolution. To the resulting solution was added with stirring 3.2 kg of epoxy oligomer ed-20, 2 kg of dioctylphthalate, 2 kg of talc, 3.2 kg of titanium dioxide (TiO₂) and 3.9 kg of chromium oxide (Cr₂O₃). The temperature of the mixture gradually reduced to 25 - 30^oC.

The resulting mixture was placed in a ball mill and produce a dispersion with 30 - 40^oC to the degree of dispersion of 20 to 30 μm on grindometer. Obtained a suspension of the green color filter and serves on packing.

Before applying to the resulting composition add a mixture of 1.87 kg ASOT-2 and 0.23 kg of polyethylenepolyamine. The resulting composition with a hardener must be used within 1.5 - 2 hours

Example 2. 15,6 kg dry waste polystyrene loaded into the reactor, add 50 kg of toluene and 15.6 kg of ethyl acetate and dissolve the polystyrene under stirring at 70 - 75^oC.

To the resulting solution was added to 3.9 kg of epoxy oligomer e-40, 2,34 kg of dibutyl phthalate, 3,9 kg of chalk, 5.5 kg of titanium dioxide and 0.78 kg blue phthalocyaninato pigment. The process produced analogously to example 1.

Formulations of the compositions and properties of the obtained coatings are given in table. 1 and 2.

As seen from the above examples, the coatings obtained on the basis of the proposed compositions exhibit good adhesion and chemical resistance, and high physical-mechanical indicators, not inferior, and in hardness few superior received the prototype.

At the same time, the use of waste polystyrene solves the problem of their utilization, allows cheap protective-decorative coating of high quality without pre-treatment of waste.

Polymer composition for protective and decorative coatings, including film-forming, plasticizer, filler, pigment and a solvent, characterized in that it contains a film-forming waste production of polystyrene emulsion method, containing 97% of polystyrene and 3% of sodium oleate as an emulsifier, and low-molecular epoxygenase oligomer, as a plasticizer - esters of phthalic acid, the solvent is a mixture of ethyl acetate and toluene in their mass ratio of 1 : (3 - 4) and further comprises a hardener - mixture polyamine, selected from the group of vklyuchayuschimisya in cyclohexanone brand ASOT-2, when the mass ratio polyamine and hydrolytic polycondensation product brand ASOT-2 1 : (8,1 - 10,3), in the following ratio of the components of the composition, wt.%:

Waste production of polystyrene emulsion method - 16,0 - 22,0

Low-molecular epoxygenase oligomer - 3,1 - 4,0

Plasticizer - 1,9 - 2,7

Filler - 1,0 - 3,9

Pigment - 3,6 - 7,75

Solvent - 61,6 - 66,8

The hardener is a 2.0 to 2.55 and