WCC-5203A FLAME RETARDANT
EPOXY RESIN POTTING COMPOUND
WCC-5203A is a flame retardant epoxy
resin potting compound for fly-back transformer
of colour TV sets.The product is a two-package
potting compounds composed of flame retardant
epoxy resin and acid anhydride curing agent
etc. may be design and supplied in terms
of customer’s requirements at home and abroad.It
has similar technical properties and application
procedures to the flame retardant epoxy
resin casting compound KE-5203 issue from
Japan’s Hitachi Kasai K.K.,and appropriate
to use on introduce line from elsewhere
of fly-transformer of colour TV sets for
automatic and continuous vacuum casting-potting.
This compound has the following characteristics:
⑴Curing time is shorter.Total curing time
only is 5 hours.
⑵Low viscosity,good impregnation to coils.
⑶Smaller dielectric constant.Excellent
electrical properties.
⑷Excellent flame retardant property arrived
at V-0 grade determined by the standard
UL-94.
⑸Without any corrosion on polyester enameied
wire,potted product has higher reliability.
Mixing ratio and curing condition:
| Type |
WCC-5203A |
| Major agent(Epoxy resin) |
5203A |
| Curing agent(Anhydrides) |
5203B |
| Mixing ratio(by weight) |
A |
100 |
| B |
30 |
| Curing condition ℃/h |
75/2.5+0.5h
rising temp.+105/2.5h |
Typical properties of WCC-5203A before
curing:
|
Item |
Package |
Unit |
WCC-5203A |
Test Method |
|
Appearance |
|
|
White |
By the eye |
|
Viscosity |
A |
40℃ mpa.s |
1.1-1.5×104 |
GB2791-81 |
|
|
B |
40℃ mpa.s |
20-25 |
Idem |
|
|
A+B |
40℃ mpa.s |
450-700 |
Idem |
|
Density |
A |
25℃ g/cm3 |
1.60-1.80 |
GB1033-86 |
|
|
B |
25℃ g/cm3 |
1.10-1.30 |
Idem |
|
Gelation time |
150℃,s |
120-160 |
LY234-83 |
|
Pot life* |
35℃,h |
>4 |
|
*with double initial
viscosity
WCC-5203 A package viscosity
characteristic:
Fig.1 The relationship between temperature
and viscosity of the A package.
WCC-5203 B package viscosity
characteristic:
Fig.2 The relationship between temperature
and viscosity of the B package.
WCC-5203 A exothermal indication curve:
Fig.3 Exothermal
Indication Curve of WCC-5203 A
Typical properties of cured compound for
the WCC-5203A
Technical Specification of the WCC-5203A
cured compound
|
Item |
Condition |
Unit |
WCC-5203A |
Test Method |
|
Hardness |
25℃ |
Shore-D |
90 |
GB2411-80 |
|
Volume resistivity |
25℃ |
ohm-m |
4.5×1013 |
GB1410-78 |
|
Volume resistivity |
100℃ |
ohm-m |
2.0×1012 |
GB1410-78 |
|
Dieledtric Constant |
25℃ |
|
≤3.8 |
GB1409-78 |
|
Dieledtric Constant |
100℃ |
|
≤4.2 |
GB1409-78 |
|
Dielectric loss tangent |
25℃ |
% |
0.7-0.9 |
GB1409-78 |
|
Dielectric loss tangent |
100℃ |
% |
1.1-1.2 |
GB1409-78 |
|
Dielectric Strength |
25℃ |
KV/mm |
>25 |
GB1408-78 |
|
Arc resistance |
25℃ |
12.5KV,s |
>120 |
GB1411-78 |
|
HDT |
|
℃ |
≥105 |
GB1634-79 |
|
Tg |
|
℃ |
≥108 |
TMA Method |
|
Linear Expansion |
Tg |
mm/mm/℃ |
4.5×10-5 |
GB1036-70 |
|
Flexural Strength |
23℃ |
Mpa |
≥81 |
GB1042-79 |
|
Flexural Modulus |
23℃ |
Mpa |
6620 |
GB9341-88 |
|
Tensile Strength |
23℃ |
Mpa |
≥49 |
GB1040-79 |
|
Thermal Conductivity |
|
Cal/cm ℃ s |
9.0×10-4 |
GB3399-82 |
|
Impact Strength |
|
KJ/m2 |
≥13 |
GB1043-79 |
|
Thermal Decompose Temp. |
|
℃ |
>250 |
DSC Method |
|
Surface Resistivity |
25℃ |
Ω |
≥1014 |
GB1410-78 |
|
Water Absorptivity |
23℃ 24h |
% |
<0.1 |
GB1034-86 |
|
Flame-retardancy |
UL 94 |
|
V-0 |
GB4609-84 |
Wet resistance of The
WCC-5203 A
Boiling test characteristic:
|
Item |
|
Unit |
WCC-5203A |
|
Volume Resistivity |
Initial value |
ohm-m |
4.5×1013 |
|
After boiling* |
ohm-m |
2.0×1012 |
|
Dielectric Constant ε 1MHz |
Initial value |
|
3.8 |
|
After boiling |
|
4.2 |
|
Dielectric loss 1MHz tangent δ |
Initial value |
% |
0.8 |
|
After boiling |
% |
1.2 |
*Boiling Condition:After
100℃ boiling water/4h+ running water immerse
/ 16h,the data may be determined.
Safety of the WCC-5203A
|
|
Major components |
Safety |
|
WCC-5203A |
Epoxy resin, Fillers, Flame –retardant,Additives |
Slightly irritating to the skin |
|
WCC-5203B |
Anhydride,Acceleratot |
Certainly irritating to the skin |
|
A+B |
|
Slightly irritation |
Storage condition:
At storage,no opening package drum.Should
storage at lower than 35℃, approximately 70%
RH,avoid light and ventilate,and must keep
these materials far away from the fire
source.Storage time do not go beyond range
of 0.5-1 year.
Usage Process:
Before casting-potting,package A and package
B of the WCC-5203 A must respectively
vacuum deaerated,should be mixed.The
casting-potting operation of the material
can perform after mixing and re-deaerating.Recommend
usage process as follows:
1.Component A:vacuum deaerate with stirring
for 4-6h at 60℃±5℃ and 1-3 mmHg of absolute
pressure;
Component B:vacuum deaerate with stirring
for 3-4h at 38-40℃ and 1-3mmHg of absolute
pressure;
2.Adjust the ratio of component A and
Component B after vacuum deaeration to
100:30(by weight);
3.Preheat the devices to be cast-potted at
90-100℃ for 2h;
4.Put the devices preheated into a vacuum
casting-potting machine and wherein perform
the casting-potting operation at 5-8 mmHg of
pressure;
5.Put the cast-potted devices into a curing
oven and wherein cure them under given
curing condition;
6.Above process may be adjust with according
to various vacuum casting-potting machine.
Application note:
1.The fillers of component A stocked for
long tend to precipitate,therefore it must
pay attention to homogeneously agitate
before use.
2.The 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.
3.The 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.
Transport:
As ordinary chemicals,because no fire-and
explosion-hazardous. |
|
