Nuclamid

AJV-ENERGO, a.s. strives to use the latest technological developments in material, as represented by plastic based on polyamide PA-6, which has been successfully applied in power plants at mines, power stations, heating plants, or chemical plants, wherever there is an extreme surface stress and resistant materials are needed. Therefore, we would like to introduce NUCLAMID material

NEW MATERIAL BASED ON POLYAMIDE PA–6

Material characteristics

NUCLAMID is a linear aliphatic unmodified polyamide produced by the anion polymerization of 6-caprolactam using an original Czech catalytic system based on magnesium salts. This catalytic system results in a significantly reduced content at the crystalline phase while the proportion of hydrogen bridges is maintained.

The basic characteristic of NUCLAMID is its great toughness while retaining its strength and stiffness. This combination is necessary for lining materials resistant to abrasion and mechanical stress. Their excellent mechanical characteristics, low adhesion coefficient and high temperature resistance (from -60 °C to +140 °C) can be used for various structural elements.

1. Lining the transport ways of loose materials:
   • Protecting the metal sheets of transport ways against wear and sticking
   • Lining underground coal reservoirs
   • Propeller refurbishing – lining of supporting columns in underground reservoirs
   • Abrasion and fuel hoppers of conveyor belt chutes
   • Conveyor belt drop beds
   • Coal-handling conveyor belt chutes, conveyor belt wiping boardsů
   • Protective lining of conveyor belt chutes
   • Sliding benches in the area of the hopper wipers of coal-handling conveyor belts
   • Coal path chutes under the crusher
   • Protecting of loading reservoirs against abrasion and the coal sticking as a replacement for the original glass tile lining
   • Flaps of conveyor belt hoppers for loading railway carriages
   • Surfaces used for transporting slag in coal power stations
   • Lining worm conveyors for transporting brown-coal dust
   • Lining of brown-coal suction equipment
2. Lining of the surfaces of wheel loaders
3. Lining of vibration benches for producing concrete products
4. Lining of worm conveyors for food-processing
5. Clicking boards
6. Lining of tables in meat-processing industry
7. Transport of draft and waste in breweries

Boards are supplied in size 930 x 550, and thickness 10, 12, 15, 20 and 30 mm

Basic characteristics of the material

NUCLAMID is a linear, aliphatic, unmodified polyamide produced by anion polymerization. Unlike most existing PA6 polyamides produced by anion polymerization using NaCL, sodium lactamate, which are always semi-crystalline, matrice NUCLAMID has a significantly reduced proportion of the crystalline phase. Therefore even unmodified NUCLAMID is very tough while retaining a relatively high E-module, i.e. strength and stiffness of the material. In addition to better physical-mechanical characteristics compared to competitive products based on PA 6 and ultra-high-molecular polyethylene, NUCLAMID has a high flash point of 460 °C, a high melting point of approx. 210 °C, and can be used short-term at 140 to 180 °C , long-term up to 140 °C.

Specifications

Property/Material	PA 6	RIM	NUCLAMID	HDPE
Tensile strength (MPa)	50 - 60	50	>60	44
Melting temperature (°C)	215-220	n	210-213	135-138
Hardness (MPa Brinell) (°Sh Shore)	78-74 (Shore D) 45-60 (Brinell)	n	70 (Shore D)	66 (Shore D) 38 (Brinell)
Breaking elongation (%)	100-300	250	> 220	> 350
Notch toughness (23 °C) (kJ/m2)	3 (Izod) 3 - 16(Charpy) 8 - 23 (Charpy)	10 (Izod) 18-20 (Charpy)	> 45 (Charpy)	n
Impact toughness (kJ/m2)	n	90	n	n
Module of tensile elasticity (GPa)	1,3-3	1.5-2,6	> 1,6 > 0.7	n
Ignition temperature (°C)	n	n	460	n
Max. usable permanent temperature (°C)	110 - 120	110 - 120	140	80
Internal resistance (W)	105 (102 )	n	2,6·1010	>1015
Surface resistance (W)	105 (103)	n	2,8·1010	>1013

MATERIAL RADIATION RESISTANCE TEST REPORT ACCORDING TO IEC 544

Report No. QA-305/PrZk/11/2005/01

1.

Material:	NUCLAMID (special polyamide material)
Type of material:	Material based on polyamide, prepared at polymerization temperature 165°C – 195°C
Use:	Structural material applied in aggressive environment under ionizing radiation
Supplier:	AJV-ENERGO, a.s.

2. Radiation tests:

Gamma ray sources ⁶⁰Co: ROZA, PRAZDROJ, PANOZA

A Series:	Samples 0.2 mm, 0.5 mm and 2.0 mm thick exposed to gamma ray dose of 72 kGy in air and in oxygen environment (0.75 MPa) at dose rate 0.2 kGy/h at 20°C.
B Series:	Samples 0.5 mm thick exposed to gamma ray dose of 66 kGy in air and in oxygen environment (0,75 MPa) at dose rate 0.2 kGy/h at 20°C.
C Series:	Samples 0.5 mm thick exposed to various gamma ray doses of up to 500 kGy in oxygen environment (0.1 MPa) at dose rate 0.17 kGy/h at 50°C.
D Series:	Samples 0.5 mm thick exposed to various gamma ray doses of up to 500 kGy in air at dose rate 0.12 kGy/h at 34°C.

3. Material tests:

Method:	Tensile testing according to ČSN EN ISO 527-1,2.
Sample size:	Bilateral blade, width=4 mm, working lenhth=25 mm and appropriate sample thickness.
Testing machine:	Instron 5543, load capacity 1 kN and contact extensometer.
Evaluation criterion:	50% of original elongation rate.
Location and time of testing:	Laboratory No. 1093.3 ÚJV Rež a.s. (The Nuclear Research Institute Rež), accredited by CIA (Czech Accreditarion Institute), certificate No. 301/2003. Tests were executed in 2003 – 2004.

4. Results:

No.	Series	Dose(kGy)	Elongation (%)			Strength (MPa)			Note
			0,2 mm	0,5 mm	2 mm	0,2 mm	0,5 mm	2 mm
1.	A	0	220±20	239±21	281±21	61±4	62±4	63±3
2.	A	72	63±4	162±11	194±20	38±2	43±1	47±3	In air
3.	A	72	3±1	24±3	60±19	16±4	30±1	41±3	In 0,75 MPa O2
4.	B	0	/	254±50	/	/	61±9	/
5.	B	66	/	196±19	/	/	50±2	/	In air
6.	B	66	/	34±22	/	/	36±4	/	In 0,75 MPa O2
7.	C	0	/	244±20	/	/	67±4	/	Batch 8-362
8.	C	50	/	76±17	/	/	31±1	/	ditto
9.	C	100	/	98±8	/	/	29±1	/	ditto
10.	C	150	/	100±25	/	/	33±3	/	ditto
11.	C	500	/	55±7	/	/	24±1	/	ditto
12.	D	0	/	239±9	/	/	60±2	/	Batch 8-393
13.	D	100	/	121±17	/	/	39±1	/	ditto
14.	D	200	/	76±11	/	/	38±1	/	ditto
15.	D	300	/	67±12	/	/	39±1	/	ditto
16.	D	500	/	28±6	/	/	45±1	/	ditto

Radiation index RI: (defined as log 10 of radiation dose in Gy, at which evaluation criterion has been reached):

4.7 – under C Series conditions

5.0 – under D Series conditions

Expected life of NUCLAMID material: 34 years (at environment temperature 20°C, dose rate 4 Gy/h, activation energy for thermal degradation 1.24 eV and 50% total elongation criterion) .