Weather-resistant enamel

 

(57) Abstract:

The invention relates to enamel for protective and decorative coatings wood and primed metal products and structures, used in the atmospheric conditions of temperate climate. Enamel contains collection PSV, plasticizer, pigment, copper oleate, organic solvent and the additional film-forming copolymer of butyl methacrylate and methacrylic acid and a filler, which allows to obtain a durable coating with high resistance, hardness, heat-resistance. table 2., 2 Il.

The invention relates to the paint industry, in particular, to coatings for protective and decorative coatings, wood, primed metal products, operated in atmospheric conditions.

The technical essence is the closest to the proposed enamel is enamel SC-132, which is a suspension of pigments, expanded with nitrocellulose, plasticizer and dispersant additive [GOST 6631-71; M. L. Livshits, B. I. Przyjalkowski. Paint and varnish materials. The Handbook. M., "Chemistry", S. 274]. This enamel is used for painting of wooden and temperate climate. Coating system consisting of two layers of enamel SC-132 deposited on the primed surface, is able to maintain the weather resistance of not less than two years (up to a point A31 according to GOST 9.407-84).

Enamel SC-132 contains, as proposed enamel, collection, resin - additional foaming agent, plasticizers, pigments, dispersing additives (copper oleate), organic solvents. The ratio of the components in the enamel of the following, wt%:

Collection - 5,79 is 7.85

The alkyd resin (based on dry matter) - additional foaming agent is 11.58 - 16,00

Plasticizers (chloroparaffin, dibutyl phthalate, castor oil) - 3,48 - 4,71

Pigments in the form of Shuvalovsky paste (or liquid pastes, obtained the bead or ball mill) - 7,82 - 11,54

Copper oleate (calculated on dry substance) - 0,07 - 0,10

Organic solvents, such as ethanol or Isobutanol), butyl acetate, ethyl acetate or acetone), ethyl cellosolve or cyclohexanone, toluene - the Rest is up to 100%

The main common feature of the prototype and the proposed object is weather resistance (light resistance, heat-resistance, moisture resistance) in a temperate climate.

The disadvantages of the known enamel are low sweeton is donosti enamel, in particular, light fastness, heat resistance and hardness of the enamel coating.

This objective is achieved in that in the composition of the enamel, including collection, plasticizers, pigments, copper oleate, organic solvents, such as additional film-forming agent is injected copolymer of butyl methacrylate and methacrylic acid, as well as fillers in the following ratio, wt.%:

Collection brand PSV - 9,0 - 10,0

The copolymer of butyl methacrylate and methacrylic acid - 4,5 - 6,0

Plasticizers - 4,8 - 5,5

Pigments - 1,7 - 10,0

Fillers - 0,5 - 2,0

Copper oleate - 0,07 - 0,1

Organic solvents - the Rest is up to 100%

Volatile part of the enamel is a mixture of organic solvents of the following composition, wt.%:

Ethyl alcohol (Collectione) - 4,93 - 3,83

Butyl acetate - 23,76 - 24,04

The ethyl acetate - 23,76 - 24,04

The ethyl cellosolve - of 9.55 - being 9.61

Toluene or xylene - 38,00 - 38,47 - total: 100%

As film-forming (binder) in the enamel used:

- collection brand PSV according to GOST 5936-73.

As additional film-forming -

copolymer of butyl methacrylate and methacrylic acid in THE 6-02-115-91 with ISM.1, 2;

- pigments - titanium dioxide according to GOST 9808, THE 6-10-1650, pigment yellow lightfastness according to GOST 5691, pigment red iron oxide on THE 6-10-602-86, pigment blue phtalocyanines according to GOST 6220, pigment green phtalocyanines on THE 6-14-195-77, carbon technical grades K-354, 504, P-701 according to GOST 7885 and other light-, weather-resistant pigments;

- solvents: ethyl alcohol according to GOST 17299, GOST 18300, THE 07506-004-59-96, butyl acetate normal technical GOST 8981, ethyl acetate according to GOST 8981, ethyl cellosolve, GOST 8313, toluene oil GOST 14710-78;

- fillers: mica wet grinding THE 5725-011-13187253-97, THE micro-talc 113-00-05759008-2-93, GOST 19284.

The manufacturing process of enamel consists of the following operations:

1. Preparation of the solution of collocalia in a mixture of organic solvents.

2. The preparation of the dispersion medium solution of a copolymer of butyl methacrylate and methacrylic acid in a mixture of organic solvents; mixing it with a solution of copper oleate, the plasticizer.

3. A mixture solution of a copolymer of butyl methacrylate and methacrylic acid and pigments, fillers; predispersion the resulting suspension (dissolvere or other appellate to control the degree of milling of pigments, fillers, mass content of nonvolatile substances, viscosity.

5. Obtaining enamel mixture prepared pigment paste with a solution of collocalia in the mixer.

6. Sampling of enamel and the full analysis (if necessary, the registration type), tests of enamel on the technical characteristics of known ways, plum enamel in a container filtering.

The resulting enamel is applied on the substrate by known methods.

Examples of compounds for 6 colors of enamel are shown in table. 1, and the results of comparative tests offered and known enamel - in table. 2 and in Fig. 1 and 2: a graphical image based white coating on the time of UV irradiation - Fig. 1, according to thermostate (as measured by weight loss of the enamel film) on the duration of heating at a temperature of 160oC.

Testing properties of enamel and coatings from it are carried out by standard methods: determination of mass fraction of non-volatiles - according to GOST 6989, determine the rate of drying enamels - - according to GOST 19007, viscosity of the enamel - according to GOST 8420, the opacity of the dried film of enamel - according to GOST 6784, coating adhesion - according to GOST 15140, durability of the coating is shibe - according to GOST 6806, film strength at impact - according to GOST 4765, the hardness of the film - according to GOST 5233, conventional light and white cover - photovoltaic device, FB-2, GOST 21903 and instructions for its operation.

Test results of the compositions proposed enamels and coatings from it in comparison with the prototype (table. 1 and 2, Fig. 1 and 2) indicate the achievement of the objectives of the invention.

In light covering different colors of enamel is not less than 2 times (see tab. 1) are superior to known enamel. This is evidenced by the dynamics of reduction of white coating depending on the time of UV irradiation. For 200-hour time exposure the coating white enamel white decreased by 8.3%, while white cover new enamel decreased only by 4.6% (Fig. 1, curves 1 and 2 respectively).

Numerical superiority of the proposed enamel for heat resistance (as measured by weight loss of the film at 160oC and preservation coating white) confirms the graphic image (Fig. 2). The film offered enamel white (curve 2) for 300 hours tempering has a weight loss of only 0.6% with preservation of the decorative characteristics (color, vneshnej with tests).

The hardness of the coating from the new enamel surpass well-known enamel by 50-100%.

The samples of the coatings of the proposed enamel withstood 15 cycles of accelerated weather resistance test (temperate climate). Samples are practically no changes in appearance, cracks, blisters, peeling. Evaluation of the protective properties of coatings 1 point (according to GOST 9.407-84, p. 2, 3, 6).

The content of the modifying agent is a copolymer of butyl methacrylate and methacrylic acid, equal to 4.5 to 6.0 wt.% is optimal for only a complex painting-technical properties of the enamel, the protective and decorative characteristics of the coatings from it.

When the content of the modifying agent more than 6 wt.% dramatically increases the viscosity of the enamel, and with less content deteriorate the light fastness, heat resistance of the coating.

Administration of 0.5-2.0 wt.% highly dispersed fillers increased stability of the enamel during storage (more loose sediment during prolonged storage), as well as physico-mechanical characteristics of the coatings. Higher filler content deteriorates the appearance of the coatings, but with less content reduced content of non-volatile residue enamels (osobennosti (4,8-5,5 wt.%) optimally. The larger amount of plasticizer reduces the hardness of the coatings, and the smaller one does not provide them with the required elasticity.

The enterprise-applicant-prepared industrial production of enamel, developed technical documentation.

Weather-resistant enamel, including collection brand PSV, plasticizer, pigments, copper oleate and organic solvents, characterized in that it contains as additional film-forming copolymer of butyl methacrylate and methacrylic acid, as well as fillers in the following ratio, wt.%:

Collection brand PSV - 9,0 - 10,0

The copolymer of butyl methacrylate and methacrylic acid - 4,5 - 6,0

Plasticizers - 4,8 - 5,5

Pigments - 1,7 - 10,0

Fillers - 0,5 - 2,0

Copper oleate - 0,07 - 0,1

Organic solvents - the Rest is up to 100%

 

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