STRUCTURE: BF - 2 glue represents spirit polivinilbutiralya with one - step phenol - formaldehyde resins in the RFG state standard specification 12708 - 77 solvent (mix isopropyl, butyl or isobutyl).
APPOINTMENT:
Glue is intended for pasting in all production areas
- non - ferrous metals
- stainless steel,
- aluminum magnesium alloys,
- ferrite,
- copper,
- textolite,
- fibreglasses,
- plexiglas,
- skin,
- ceramics,
- wood materials,
- nonmetals with metals
- , etc.
the affected vibration loadings,
and also for the products working in aggressive environment.
ADVANTAGES:
- One - component. It is possible to dilute to light body that allows to apply it on surfaces with thin coat, including the mechanized ways.
- It is applied to pasting of the materials working in the conditions of elevated temperature
- and also in acid and alkaline condition, it is resistant to fuels, oils, salt fog and sea water, etc.
- It is steady in ACIDIC ENVIRONMENTS even when heating to + 60÷80 of °C.
- It is recommended for work at any climatic conditions at temperature from - 60 ºС to + 80 ºС (quickly 100 ºС).
- Glue does not cause corrosion of steel and aluminum alloys.
- Glue does not form toxic connections in the air environment and drain waters in the presence of other substances or factors.
- At heat aging of glue connections their durability increases (owing to glue aftercure (when heating to 175ºС).
- Has the bigger thermal stability, but smaller elasticity in comparison with BF - 4 glue.
INDICATORS according to the technical documentation of GOST 12172 - 74:
Appearance: transparent or slightly rather turbid liquid from yellow to reddish
Funnel viscosity (on the VZ - 246 viscometer with mm Ø6 nozzle at t (20±0,5)0C), with: 25 - 55
Mass fraction of solid residue, % : 14 - 17
Density on water, kg/m3: 784,4
Water solubility - Glue is turned
Strength of glue connection at shift, MPa (kgf/sq. m):
at 293 K (20 °C): not less than 19,6 (200)
at 333 K (60 °C): not less than 9,8 (100)
Bend of adhesive film after hardening, mm: no more than 3
The thermal stability of adhesive film after hardening and aging: lack of cracks
Corrosion activity on samples from aluminum alloy: absence
TECHNOLOGY OF PASTING:
- To process adherend surfaces coated abrasive, to degrease.
- To apply glue with brush. Number of layers 1(2).
- To connect surfaces.
Drying temperature is possible to 140 - 150ºС
Drying time (at 140ºС) 60 min.
Pressure is 0,5÷0,6 of MPa
Safety requirements: at 160ºС from glue allocation of gaseous veshchestv: fenol, formaldehyde, ammonia, butyraldehyde is possible.
Glue spread on each layer of 150 - 200 g/m2.
According to OST B 84 - 2081 - 83 "The materials gluing. Standard technology processes of preparation and pasting" are recommended the following conditions of pasting:
PASTING MODES:
1) LAYER - BY - LAYER DRYING:
I layer (25 + - 10) ° C, time of 30 - 60 min. , then 55 + - 5 time of 15 - 20 min.
II layer (25 + - 10) ° C, time of 30 - 60 min. , then 55 + - 5 time of 15 - 20 min. ; then 85 - 90 time of 15 - 20 min.
HARDENING:
(150 + - 5) ° C, time of 1 - 2 h, pressure (49 - 98) * 10 4 Pas (5 - 10 kgfs/cm2)
or (120 + - 5) ° C, time of 4 - 5 h, pressure (49 - 98) * 10 4 Pas (5 - 10 kgfs/cm2)
2) LAYER - BY - LAYER DRYING:
I layer (5 + - 10) ° C, time of 30 - 60 min.
II layer (25 + - 10) ° C, time of 3 - 5 min.
HARDENING:
55 + - 5 ° C, time of 9 - 10 h, pressure (4,9 - 49) * 10 4 Pas (0,5 - 5 kgfs/cm2)
or 25 + - 10 ° C, time of 24 - 25 h, pressure (4,9 - 49) * 10 4 Pas (0,5 - 5 kgfs/cm2)
The hardening modes at temperatures (55 + - 5) ° C and (25 + - 10) ° C apply in the absence of high requirements to durability of glue connection.
When pasting ferrite details apply glue viscosity from 130 to 150 with on the state standard specification 9070 - 75 B3 - 4 viscometer, when pasting sheets, plates, asterisks of stators and rotors – viscosity not less than 12 pages.
When pasting ferrite details and assembly units cure of an adhesive is made with pressure of 19,6 * 10 4 Pas (2 kgfs/cm2).
At kontrovka and fastening of carving assembly units and when fixing rounds of coils and cotton threads in the course of production of coil - processing products it is allowed to cure glue at temperature (25 + - 10) ° C without its layer - by - layer drying.
STORAGE CONDITIONS: To store glue in hermetically closed container at temperature from 0 to 25 ºС.
WARRANTY PERIOD of STORAGE of glue from the moment of production — not less than 10 months.
After warranty period of storage glue can be used for designated purpose after check of its quality.
PACKAGING: metal drums with a capacity of 15 kg.
BF - 2 glue it is possible to stick together such inert materials as polyolefins, fluororganic and silicone polymeric materials, after pretreatment of surface.
When pasting, for example, of polyolefins the surface of material is processed by the mix consisting from 75 mass. ch. potassium bichromate and 1500 mass. ch. distilled water. When pasting fluororganic polymers the surface of material is processed within 15 min. at 20 ° C by solution of sodium metal in mix of naphthalene and tetrahydrofuran.
EXAMPLES of USE: in electronics production of the foiled dielectrics, pasting of copper and its gluing to getinaks and fibreglasses, in instrument making - production of magnetic conductors.
REFERENCE: The manufacturing plant which is part of military industrial complex of Russia guarantees stable high quality of products.
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