SU1616937A1 - Method of producing composition for anticorrosion coating - Google Patents

Abstract

The invention relates to methods for the preparation of compositions for coatings used to protect chemical equipment that is used in solutions of mineral acids, their salts and gaseous corrosive media at elevated temperatures and concentrations, and can be used in areas of the national economy such as chemical industry, engineering, automotive industry, agricultural and tractor engineering. The invention allows to ensure the stability of the protective and adhesive properties of the coating when exposed to hot liquid and gaseous acidic media: the chemical resistance of the coating in 24% HCL at 100 ° C until the first signs of corrosion are 579-585 h, the chemical resistance of the coating in gaseous HCL at 100 ° C until the appearance of the first signs of corrosion is 3600-3780 hours. The composition is prepared as follows. A calculated amount of a fluorine-containing copolymer (copolymer of vinylidene fluoride with trifluorochloroethylene, F-32 L, with tetrafluoroethylene, F-42 L, with hexafluoropropylene F-26 L) is added into a container with a mechanical stirrer or a ball mill, and a mixture of solvents is added (mixture of 50 wt.% Ethyl acetate , 40 wt.% Ethyl acetate and 10 wt.% Acetone), mix until dissolved, and add epoxy resin ED-20, mix for 5-6 hours. Separately prepare a "pigment paste", which consists of 18-20% a solution of 30-40 wt.% of the total number of copolymer of vinylidene fluoride in about ganic solvent and the modified filler, and grinding the mixture obtained to the extent of 40-50 microns peretita "wedge". Then the "pigment paste" is added to the film forming solution and the mixture is dispersed for 22-24 hours. Before applying a hardener - tetraethyltriamine - to the composition. The modified filler is obtained by passing a 5–10% solution of 1,2,3-benzotriazole in ethyl alcohol in the adsorption column in an adsorption column for 1–1.5 h at an elution rate of not more than 5 ml / min through a pre-calcined barium sulfate. 1 tab.

Description

The invention relates to methods for the preparation of compositions for coatings used to protect chemical equipment, which operates in solutions of mineral acids, their salts in gaseous corrosive media at elevated temperatures and concentrations, and may find application in such national areas as chemical industry, mechanical engineering, automobile industry, with U1skohoz yt-tbennoe and tractor mechanical engineering,; The purpose of the invention is to ensure the stability of the protective and adhesion properties of the coating when exposed to: ordinary liquid and gaseous acidic media;

As a copolymer of vinylidene fluoride, its copolymer with rifluorochloroethylene, F-32L (TU 6-05-1620-73), with tetrafluoroethylene, F-42 L | TU 6-05-1442-7), with hexafluoropropyl-4ene F-26, is used. L (TU 6-05-906-78) .; Epok-4idna resin ED-20 corresponds to toCT 105-87,

; The modified I, 2 j 3-benzotriol yolum barium sulphate is obtained with

; but. The content of 1,2 3-benzotriazole 1 |, 5 wt.%. After 30 g of pregum | rokalennogo sulphate of barium, g | will be ground in an adsorption column with I) 10 mm; 50% solution of 1,2,3-benz | uriazole in ethyl alcohol; Adsorb phtase for at least} - 1.5 hours at an elution rate of not more than 5 ml / min. The degree of adsorption is

b. The content of 1,2,3-benzotriazole is 1.7 wt.%. After 30 g of pre-calcined barium sulphate is passed in an adsorption column with

D 10 mm 7% solution of 1,2,3-benzo-h riazole in ethyl alcohol. Further, as in paragraph a,

Century The content of 1,2,3-benzotriazole 2.0 wt.%. After 30 g of pre-calcined barium sulphate is passed in an adsorption column with

In 10 mm 10% solution of 1,2,3-ben-eotriazole in ethyl alcohol. Next, KiaK in paragraph a.

The composition was prepared as follows.

In the tank with a mechanical stirrer or ball mill enter the calculated amount of fluorine-containing

f5

20 25

,

.with

40

50

five

At the rate of 18–20% solution, mix until complete dissolution and add the required amount of ED-20, stirring for 5–6 h. A pigment paste is prepared separately at the spray machine or bead mill. dry residue 60-75%, which consists of a solution of a fluorine-containing copolymer in an organic solvent and a modified filler, to a degree of milling 40-50 microns over the wedge. Then, a pigment paste is added to the film forming solution and the mixture is dispersed in the same container with a mechanical stirrer or a ball mill for 22-24 hours. Before applying tetraethyltriamine into the composition.

Examples 1-12, the Compositions according to the examples receive as described above.

The compositions of the compositions, the sequence of the introduction of the components and the properties of the coatings based on the compositions are given in Table I

Claims (1)

Invention Formula The method for preparing a composition for an anticorrosive coating by blending in a medium of an organic solvent a copolymer of vinylidene fluoride with a fluorine-containing compound selected from the group consisting of trifluorochloroethylene, tetrafluoroethylene or hexafluoropropylene, and a low-molecular epoxy resin, with the addition of the core material, it will be used to make a mixture of halogen-fluoride, hexafluoro-propylene, and a low-molecular epoxy resin, with a mixture of halogenophenyl ethylene or hexafluoropropylene; to ensure the stability of the protective and adhesive properties of the coating when exposed to hot liquid and gaseous acidic media, previously in an 18-20% solution in organic vinylidene fluoride copolymer solvent, taken in an amount of 30-40% of its total mass, is ground with a modified 1.5-2.0 wt.% 1,2, 3 benzotriazole barium sulfate followed by the introduction of the resulting paste into a mixture containing the remaining amount of vinylidene fluoride copolymer dissolved in an organic solvent and a low molecular weight epoxy resin dian, and the addition of a hardener at the following the ratio of the original components, mac.ch .: Vpepe specified copolymer of vinylidene-Fluoride 5-23 Low molecular weight epoxy resin 4-27 616937 Modified 1.5-2.0 wt.% , 3-benzotriazole sulfate barium Hardener Organic solvent 5-30 0.24-1.62 23-106 Sodch "avne koilovevtov, wt.h. IS five 15 15 thirty 15 to 0, " "9 10 0.6 69 15 10 0.6 69 15 10 0.6 69 23 --- 15-15 --five . 27ttЛ10 1.62 0.60.24 0.6 106 6923 69 --- .   ,,. --- 15 ----.-15-- 40 35 30 35 35 35 5 35 ED-20 (9.2) (5.25). (1.5) (5.25) (5.25) (5.25) (5.25) (3.5) - ------- .. ---- - - Studs mms kashovsatov 18 nineteen 20 nineteen nineteen I nineteen nineteen 15 18 15 15 IS 15 15 15 15 15 15 10 0.6 10 0.6 10 0.6 10 0.6 10 0.6 10 0.6 10 0.6 five 0.6 69 69 69 69 69 69 69 82 35 (5.25) . 35 (5.25) 15 15 15 15 nineteen nineteen sixteen 27 nineteen 19 19 18 1616937 Coverage Indicator amberness with rzgethesht. Sha 26.5 25.8 25.2 22.3 2.9 Our status is e, X Aflifesioi (iethodo1 otsla va-yuo), kgf / o Chest resistance in the 2nd Hci at up to I occurrence XK | {scourge stand- in 24Z-KOK. Yas |. at lOO C up to signs of corrosion,  Hwy  resistance in gaseous HC1 npJB lOO C to pS1Yavlevi per480 80 690 U60 21.7 468 23.4 22.5 23.2 25.9 26.1 21.8 20.8 21.020.9 LUO475470 475 473 480475 475479 3.15 3.1 1.83 1.79 1.75 1.82 1.91 3. 2.85 1.65 1.85 1.65 I. 585 579 393 5WO 395 320 5Z5 525 530 220 380 225 220 Btix Prize Vkov Corrosion, h 3600 3780 3650 2878 3150 2970 2580 ZOYU ZOYU 3200 1850 2820 1800 1350 Chemically, the resistance of coatings is determined by the capacitive method and the impedance method. eight Table continuation 1.82 1.91 3. 2.85 1.65 1.85 1.65 I. 320 5Z5 525 530 220 380 225 220 1350