WCC-5217 FLAME
RETARDANT EPOXY RESIN POTTING COMPOUND
WCC-5217
model is a flame retardant epoxy resin
potting compound composed of polymer
resin,phosphonus fire-retardant,modified
fillers,additives and curing agents etc.It
is an ideal substitute for Hitachi Kasai
K.K.’s KE-5217(M)(S) model,is suited for
potting Fly Back Transformers of TV
sets,various electronic
and electric components by hand-made and/or
automatic continuous potting.
This compound has the following
characteristics:
⑴Low viscosity,good impregnation to coils.
⑵Not contains halide and stibide,has
self-quenching properties,non-corrosive to
coils.
⑶Excellent arc resistance and tracking
resistance.
⑷long shelf life of product,good application
properties(long pot life).
1.Technical specification of WCC-5217
|
Item |
Package |
WCC-5217 |
WCC-5217(M) |
Test method |
|
Appearance |
A |
radish brown |
radish brown |
by the eye |
|
B |
light yellow clear liquid |
by the eye |
|
Density (g/cm3)25℃ |
A |
1.62-1.70 |
1.62-1.69 |
GB1033-70 |
|
B |
1.20 |
1.20 |
GB1033-70 |
|
Viscosity (mPa.S)40℃ |
A |
10000-20000 |
10000-20000 |
GB2794-81 |
|
B |
20-45 |
20-45 |
GB2794-81 |
|
A+B |
400-800 |
400-800 |
GB2794-81 |
|
Ratio A/B(Wt.) |
100:30 |
100:28 |
|
|
Pot life (300g 33℃ h) |
> 4 |
> 5 |
NDJ-79 model Viscosimeter |
|
Gelation time (150℃)S |
120-180 |
200-260 |
LY234-83 |
|
Curing condition ℃/h |
75℃/2.5h+
110℃/2.5h |
80℃/4h+
100℃/4h |
|
2．Typical properties of
cured compound for the WCC-5217
|
Item |
WCC-5217 |
WCC-5217(M) |
Test method |
|
Heat distortion temperature
℃ |
100±5 |
95±5 |
GB1634-79 |
|
Hardness(Shore-D) |
90±5 |
90±5 |
GB2411-80 |
|
Glass transtion temperature
℃ |
≥95 |
≥90 |
TMA method |
|
Flexural
strength(kg/cm2) |
800 |
850 |
GB1042-79 |
|
Volume
resistivity(ohm-m)25℃ |
≥1013 |
≥1013 |
GB1410-78 |
|
Sulface
resistivity(ohm-r)25℃ |
≥1014 |
≥1014 |
GB1410-78 |
|
Dielectric
contant(1mHz 25℃) |
4.0 |
4.1 |
GB1409-78 |
|
Dielectric
loss tangent(%)1mHz25℃ |
0.8-1.2 |
1.0-1.3 |
GB1409-78 |
|
Dielectric
strength(KV/mm)25℃ |
≥25 |
≥25 |
GB1408-78 |
|
Volume
shrinkage(%) |
0.5 |
0.5 |
JB3961-85 |
|
Thermal decompose temperature
℃ |
> 240 |
> 240 |
DSC method |
|
Water
absorptivity(%) 23℃ 24hr |
≤0.15 |
≤0.15 |
GB1034-86 |
|
Arc
resistance(25℃ 12.5KV,S) |
> 180 |
> 180 |
GB1411-78 |
|
Flame-retardancy |
FV-0 |
FV-0 |
GB4609-84 |
|
Linear expansion(Tg,1/℃) |
≤45×10-6 |
≤45×10-6 |
GB1036-70 |
3.WCC-5217 WCC-5217(M) A+B
mixed material’s temperature-viscosity
relationship curve
WCC-5217
WCC-5217(M) The
relationship between temperature and
viscosity of major agent(A package)
WCC-5217 WCC-5217(M)
Isothermal curve of A+B mixed material
WCC-5217 WCC-5217(M)
The relationship between curing
agent-viscosity
WCC-5217 WCC-5217(M)
Exothermal peak curve of A+B mixed
material(200g)
4.Usage
process
Before potting,package Aand B of the
WCC-5217 model must respectively vacuum
deaearated,then should be mixed by high
speed stirring.WCC-5217(M) is suitable for
deaearated potting process or hand-made
potting process after package A and B are
mixed.
⑴Component A:vacuum deaearate with stirring
for 4-6 h at 60℃±5℃ and 1-3 mmHg of absolute
pressure;
Component B:vacuum deaearate with stirring
for 3-4 h at 35-40℃ and 1-3 mmHg of absolute
pressure.
⑵Adjust the ratio of component A and
component B after vacuum deaearation to
100:30(WCC-5217) and to 100:28
(WCC-5217(M))(by weight)respectively.
⑶Preheat the devices to be potted at 90-100℃
for 2-6 h.
⑷Put the devices preheated into a vacuum
casting-potting machine and wherein perform
the potting operation at 5-8 mmHg pressure.
⑸Put the potted devices into a curing oven
and where in cure them under given curing
condition.
5.Application note:
⑴The fillers in component A stocked for long
time tend to precipitate,therefore it must
pay attention to homogeneously agitate
before use.
⑵The curing agent tend to crystallize at low
temperature in winter,it must heat them to
70-80℃ in the use (fully solubilized),having
no influence on quality.
⑶The curing agents very easy to absorpt
humidity tend to form precipitate which can
reduce the shelf-life and have influence
upon quality.It must be used up as soon as
possible,if once it is unsealed,and pay
attention to closely cover the rest.
Storage:25℃ in a dry place for 1 year.
Transport:
As ordinary chemicals,because no fire-and
explosion-hazardous. |
|
