SU740822A1 - Solid surface cleaning composition - Google Patents

Description

.in an amount of 0.1-25% by weight of 1,2-dibromotetrafluoroethane.

For the purpose of aerootropic properties, the composition contains 0.81-1 t-butyl alcohol, 73% by weight of 1,2-dibromo tetrafluoroethane.

In the above potassium content, tert-butyl alcohol is a stabilizer against the decomposition of 1,2-dibromotetrafluoroethane during agglomeration.

o The composition can be used in various installations used for cleaning PPM in the industry (for example, in installations of the UZVF-1 series). The composition can also be used without the use of heat, if this is not necessary by the technological process. HOWEVER, the ms capacity of the proposed composition is in the boiling state with an azeotropic ratio of components.

In some cases, it is preferable to use the proposed detergent composition in conjunction with ultrasonic action. This is especially necessary when removing certain types of viscous fluxes from the solder joints, and

Tert-butyl alcohol% by weight of 1,2-dibromometetrafluorozane

Boiling point, C From these data, it follows that the proposed composition, containing tert-butyl alcohol in the amount of 0.811, 73% by weight of 1,2-dibromo-tetrafluoroethane, has a constant boiling point, almost coinciding with the Aeo-Tropic point. This allows the classification of the proposed composition at the ratio indicated above. The scientific research institute of ingredients is azeotropic.

Conducted tests for resistance to decomposition during heating (determining the amount of F, Br-ions) and determining the detergency of the composition. Islands (according to the method of aniline points), 1,2-dibrcmtetrafluoroethane / methyl alcohol and 1,2-dnbro: mtetrafluoroethane with tert-bzgtilovv alcohol in total were subjected to testing. we 0.1-25,

also fluxes having insoluble inclusions. The ultrasonic effect helps out the leaching of soluble and solid insoluble flux components.

The proposed composition can be used both to remove fluxes from an anti-personnel machine, or to remove contaminants from materials that are sensitive to strong solvents, such as plastics, photographic films, tape recorders.

tapes, etc.

The boiling point and condensation of the azeotrope was determined in the Sventoslavsky differential ebullimeter. Boiling point obtained

5 is 46.6 ° C at 760 mm Hg.

The composition of the azeotrope is determined on a gas-liquid chromatograph of the brand JIXM-jSMfl, by scaling components at different percentages

In the latter, the limiting values of component containment were determined, with KuToiaax, the azeotropic properties of the composition, including 1,2 dibromotetrafluoroethane and tert-butyl, are retained

5 alcohol. Below are the compositions of the compositions and their boiling points.

1.01 1,730.81

46.63 46.65 46.64

The determination of the amount of F, Br ions in the compositions is carried out after extraction of the α-acids into the aqueous phase. To do this, in a separating funnel of the mashivat, 50 ml of KSSH1 OPTIONS with 50 ml of water are added, and the mixture is shaken thoroughly. After separation of the layers, the amount of F, Br ions by titration of the acid in aliquots is determined by water extraction.

0 (15 ml) 0.00091 N NaOH solution. The evaluation of detergency was carried out using the aniline points method (GOST 1232966). The lower the value of the aniline point, the higher the dissolving ability of the composition.

The following are compositions I-VI (after 10 hours of boiling compositions), the amount of P, Br-ions and the value of aniline points,

, /, 2-Dibromtetrafluoroethane, weight.% Methyl alcohol, in its.% Tert-butyl alcohol,% Amount of f, Br-ions. Mg sq / 1 l composition 0.92 0.90 Aniline point, ° С -34 IIIII IV

Claims (2)

VI 94 95 65 - 96 - - 4 - - 0.1 25 11.1 1.01, 90 0.38 0.18 0.26 -35 -34.3 -60.3 - -35.9 Composition with tert -butyl alcohol after 10 hours of boiling contains much less F, Br-ionv, which indicates a more stable composition. Tests were also conducted to determine the detergency of the compositions. Compositions of 1,2-dibromotetrafluoroethane methyl alcohol and 1,2-libromtetrafluoroethane with tert-butyl {m alcohol were tested. A composition with tert-butyl alcohol has a high dissolving ability at the indicated limit. Tests of the proposed composition on the efficiency of removal of soldered fluxes with MRP. FCT flux, consisting of 30 g of can fizi, 3.5 salicylic acid, 1.5 g of triethanolamine, 65 g of ethyl alcohol, is applied in a thin layer onto defatted boards. Then the flux is closed in a heating chamber for 5 s. The cleaning is carried out with an ultrasound frequency of 20 kHz with an amplitude of radiation of 7 µm. The cleaning time is 2 minutes. In experiments, compositions are used in which the content of tert-butyl alcohol is 0.1-25% by weight of 1,2-dibromo-tetrafluoroethane. Tests carried out showed that the proposed composition containing 1,2-dibromo-tetrafluoroethane and t-butyl alcohol completely removes the flux from the board. Claim 1. Composition for cleaning a solid surface, containing 1,2-dibromotetrafluoroethane and aliphatic alcohol, characterized in that, in order to increase the stability and the wet effect of the composition, as an aliphatic alcohol. contains tert-butyl alcohol in an amount of 0.1-25% by weight of 1,2-dibromotetrafluoroethane. 2, the composition according to claim.}., Q. tl, which, in order to impart azeotropic properties, it contains tert-butyl alcohol in an amount of 0.81-1.73% by weight of 1,1-dibromotetrafluoroethane. Sources of information taken into account for the examination 1.Patent of Great Britain No. 1307274, cl. C 5 D, published, 1973. 2. Authors certificate of the USSR 364690, cl. C 23 G 1/00, 1971 (prototype).