AOC Palapreg P18-03 SMC/BMC Molding Resin

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Chemical/Physical Properties

Palapreg P18-03 is an unsaturated polyester resin derived from maleic acid and glycol, dissolved in styrene. The resin has medium viscosity and high reactivity.

major application

Palapreg P18-03 is recommended to be formulated with high polymer solutions (e.g. Palapreg H850-01, H852-03, Palapreg H 1080-01, etc.) for the production of low protrusion and Class A applications, as well as high quality low shrinkage (H814-01) SMC/BMC parts. Formulations based on P18-03 can be used in a wide range of applications with high surface quality, low separation and improved pigment dispersion. Palapreg P18-03 based SMC can be easily thickened by magnesium oxide.

Product specifications at the time of delivery

causality	realm	unit (of measure)	TM
Viscosity, 23°C	1680 - 1900	mPa.s	2013
Color, Lico 200	0 - 100	APHA	2017
Solid content, IR	64 - 66.5	%	2033
exterior condition	limpid	-	2265
moisture content	0.06 - 0.10	%	2350
Acid value, original state	14.5 - 18.5	mg KOH/g	2401
Gel time	40 - 70	unit of angle or arc equivalent one sixtieth of a degree	2261
Curing time	80 - 120	unit of angle or arc equivalent one sixtieth of a degree	2261
peak temperature	270 - 295	°C	2261
accelerate thickening	490000 - 790000	mPa.s	2914

Remarks:
Viscosity: Z2/100/23°C
The reactivity was determined by adding 1 g of TBpB to 100 g of resin.
Typical values Refractive index (23°C - TM 2150) = 1.5180 - 1.5210

Properties of liquid resins (typical values)

characteristic	numerical value	unit (of measure)	TM
Density, 23°C	About 1100	kg/m3	2160
flash point	About 33	°C	2800
Storage period, unopened, dark, 25°C	3	moon	-

Properties of unfilled resins (typical values)

characteristic	numerical value	unit (of measure)	TM
bending strength	95	MPa	ISO 178
bending modulus	3.6	GPa	ISO 178
Outer fiber strain	2.8	%	ISO 178
tensile strength	50	MPa	ISO 527-2
Tensile modulus (modulus of elasticity in the direction of tension)	3.5	GPa	ISO 527-2
Elongation at break	1.5	%	ISO 527-2
Heat Distortion Temperature (HDT)	140	°C	ISO 75-A
Glass transition temperature (Tg)	185	°C	DIN 53445

Properties of SMC molded parts (typical values)

performances	numerical value	unit (of measure)	TM
Glass content	30	%	-
bending strength	180	MPa	ISO 178
bending modulus	11.0	GPa	ISO 178
Outer fiber strain	2.5	%	ISO 178
tensile strength	100	MPa	ISO 527-2
Tensile modulus (modulus of elasticity in the direction of tension)	10.5	GPa	ISO 527-2
Elongation at break	1.7	%	ISO 527-2
Impact strength - unnotched specimen	85	kJ/m2	ISO 179
Molded Shrinkage	-0.07	%	DIN 53464

Typical starting formula for SMC paste

ingredient	weights
Palapreg P 18-03	50
Palapreg H 852-03	50
TBpB	1.5
talc	200
Zinc stearate	4
MgO-Paste (35% MgO)	2.5

Processing:

Palapreg P 18-03 is processed with polymers to form LP-SMC and BMC.The ratio of Palapreg P 18-03 to the polymer solution depends on the type of polymer solution used and can be adjusted as needed. Depending on the size of the model it is recommended to add 300 to 600 ppm of hydroquinone to the system (calculation based on heated molten solution of unsaturated polyester resin).

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