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Important features for industrial pipes and fittings out of polypropylene PP - Homopolymer and PP - Copolymer.

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Presentation on theme: "Important features for industrial pipes and fittings out of polypropylene PP - Homopolymer and PP - Copolymer."— Presentation transcript:

1 Important features for industrial pipes and fittings out of polypropylene PP - Homopolymer and PP - Copolymer

2 Description and general properties Creep strength of pipe and fitting Chemical resistance Resistance against slow crack Propagation Conclusions CONTENT - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

3 high creep strength very good chemical resistance resistance against microorganisms high heat reversion resistance very good abrasion properties good weldability no deposits / no increments excellent acoustic damping characteristics very good thermoformable PP-H, PP-B and PP-R GENERAL PROPERTIES - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

4 Isotactic Polypropylene Syndiotactic Polypropylene Atactic Polypropylene Helical structure Stereoisomic kinds of PP GENERAL PROPERTIES - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

5 PP-H (Polypropylene Homopolymer) The Homopolymer consists of macro-molecules, which are built of only one polymer: P - P - P - P - P - P - P - P - P - P PP-B (Polypropylene Block Copolymer) The Block Copolymer consists of macro-molecules, where Ethylene is included in block form up to 12 % (standard < 7%): P - P - P - P + P - P - E - E - P - P - P - E PP-R (Polypropylene Random Copolymer) The Random Copolymer is built of molecules, where a certain content (2-7%) if Ethylene is embedded statically distributed: E - P - E - P - P - P - E - P - P - P PP-Types General description GENERAL PROPERTIES - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

6 PP in comparison Crystal structure PP-Homopolymer with rough sperulitic super lattices (PP-H a-nucleated) PP-Homopolymer with fine crystallic structure (PP-H b-nucleated) PP-Random Copolymer with fine crystallic structure GENERAL PROPERTIES - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

7 CharacteristicsPP-HPP-R welding quality - good - excellent exception: bending angle accord. to DVS 2203 part 5 - bending angle varies when welding PPH together with PPH,PPB and also generally significant lower than PPR - bending angle > 160 deg. with also when welding PPR together with PPH,PPB,PPR chemical resistance - good NaOH (40% / 80°C) lower resistant - higher resistant C m -factor 1,6 The allowable working pressure is Lower than for PPR - 1,25 - related to the very good impact resistance PP in comparison General properties / part 1 GENERAL PROPERTIES - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

8 CharacteristicsPP-HPP-R voids (of fittings) increasing risk of voidsgood processibility E-modulus (stiffness) higher E-modulus => support distance higher lower E-modulus => support distance lower impact strength lower impact strength applicable only for temp. > 5°C higher impact strength applicable for temp. < 0°C minimum temp. limit approx. +5°Capprox. -5°C stress-relaxation low relaxation of stress because of higher creep-modulus fast relaxation of stress because of lower creep-modulus GENERAL PROPERTIES PP in comparison General properties / part 2 - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

9 CONTENT Description and general properties Creep strength of pipe and fitting Chemical resistance Resistance against slow crack Propagation Conclusions

10 CREEP STRENGTH OF PIPE AND FITTING - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

11 Creep behaviour of pipes out of PP acc. to DIN 8077 PP-H and PP-R CREEP STRENGTH OF PIPE AND FITTING - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

12 0,11, ,0 2,0 3,0 4,0 5,0 6,0 7,0 8,0 9,0 10,0 Time to fail [h] Time to fail [years] 100 PP-H PP-B PP-R Hoop stress [N/mm ] v 2 Creep behaviour of pipes out of PP acc. to DIN 8077 at 60°C CREEP STRENGTH OF PIPE AND FITTING - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

13 Creep behaviour of pipes out of PP acc. to DIN 8077 at 80°C CREEP STRENGTH OF PIPE AND FITTING - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

14 = Safety factor 1,6 1,4 1,25 1,25 Allowed working excess pressure acc. to DIN 8077 for media water CREEP STRENGTH OF PIPE AND FITTING - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

15 Back gate Side gate Ring gate Y-gate Stress duration [h] log. t log. s Hoop Stress [N/mm²] Time to fail of injection moulded components / gating system CREEP STRENGTH OF PIPE AND FITTING - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

16 Time to fail of injection moulded components / creep tests acc. to DIN 8078 tees SDR 11 CREEP STRENGTH OF PIPE AND FITTING - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

17 Shrinkage behaviour and voids Machined stub flange out of PPH CREEP STRENGTH OF PIPE AND FITTING - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

18 CONTENT Description and general properties Creep strength of pipe and fitting Chemical resistance Resistance against slow crack Propagation Conclusions

19 CHEMICAL RESISTANCE OF PP - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

20 Comparison of weight changes PP-molding materials in HCl+MCB+o-DCB at 60°C CHEMICAL RESISTANCE OF PP - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

21 Pipe and fitting out of PP with ZnS color pigmentation after the application in a hydrochloric acid pipe system Chemical resistance of PP CHEMICAL RESISTANCE OF PP - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

22 Chemical resistance of PP Caustic soda solution 50%, T=80°C, creep test CHEMICAL RESISTANCE OF PP - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

23 Times to fail of different PP moulding materials at the creep test at 80°C in 40% caustic soda solution, test tension: 5,5 N/mm² CHEMICAL RESISTANCE OF PP - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

24 Stress crack formation because of temperature loading, production dependent internal stresses and chemical influence CHEMICAL RESISTANCE OF PP - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

25 Maximum internal stresses (tensile) often appear in the area of the bead notch Due to a loading, an additional superimposition of further stresses results. A failure of the component (welding joint) starts from the bead notch. Internal stresses in the welding zone CHEMICAL RESISTANCE OF PP - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

26 CONTENT Description and general properties Creep strength of pipe and fitting Chemical resistance Resistance against slow crack Propagation Conclusions

27 RESISTANCE AGAINST SLOW CRACK PROPAGATION - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

28 nucleation zone crazing-zone fibre stretching failure of craze fibres schematic damage course tie-molecule entanglement of tie-molecules microscopic tie-molecule Procedure of slow crack propagation RESISTANCE AGAINST SLOW CRACK PROPAGATION - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

29 geometry sheet pipe notch clamp fracture photomicrograph Test specimen for Full Notch Creep Test (FNCT) FNCT Description of the specimen RESISTANCE AGAINST SLOW CRACK PROPAGATION - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

30 FNCT-results (times to fail) of polypropylene, tested in water under 2% wetting agent influence (Arkopal N100) Material t [h] PP-R (Type B) PP-R (Type D) PP-H (Type S, -nucleated) PP-H ( -nucleated) PP-H ( -nucleated) PP-B (Type B) RESISTANCE AGAINST SLOW CRACK PROPAGATION - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

31 FNCT-results (times to fail) of polypropylene specimen, tested in water under 2% wetting agent influence (Arkopal N-100) RESISTANCE AGAINST SLOW CRACK PROPAGATION - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

32 Currently demanded minimum values in FNCT (times to fail) for PP-moulding materials (2% Arkopal N-100) from the DIBt RESISTANCE AGAINST SLOW CRACK PROPAGATION - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

33 CONTENT Description and general properties Creep strength of pipe and fitting Chemical resistance Resistance against slow crack Propagation Conclusions

34 CONCLUSIONS - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

35 Advantages PP-H high creep strength at low temperatures higher E-module, larger support distances are possible lower raw material price PPH, PPB and PPR in comparison CONCLUSIONS - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

36 Advantages PP-B better shrinkage behaviour, therefore no voids and larger injection moulding parts are possible lower internal stress potential high viscosity very high impact resistance PPH, PPB and PPR in comparison CONCLUSIONS - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

37 Advantages PP-R high creep strength at high temperatures higher resistance against slow crack propagation higher pressure loadability better shrinkage behaviour, therefore no voids and larger injection moulding parts are possible lower internal stress potential high viscosity PPH, PPB and PPR in comparison CONCLUSIONS - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

38 PP-Homopolymer: Semi-finished products for the tank construction Pipes for industrial applications PP-Block Copolymer: Piping systems for sewage water technology (underground installations) PP-Random Copolymer: Piping systems for high pressure and temperature loadings (systems for industrial water use) Welding rod Injection moulding components (specially in larger dimensions) Typical application ranges of PP-types CONCLUSIONS - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

39 PP-R, black:UV-stabilization because of high content of carbon black (impact resistance decreases) PP-R, natural: High purity applications, as no color additives are included PP-H-s:Flame retarding Homopolymer, e.g. for the application in ventilation, exhaust or chimney systems PP-R-s-el:Flame retarding Random Copolymer, which is mostly used for the transport of slightly ignitable media because of its electrical conductivity Modified PP-moulding materials CONCLUSIONS - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

40 Bends 90°out of PP up to d500 in SDR 33, 17,6 and 11 Tees out of PP up to d 500 in SDR 33, 17,6 and 11 Backing rings out of PP/St up to d 630 for max. working excess pressures of 10 bar Injection moulded components for Pressure piping systems CONCLUSIONS - Properties - Creep strength - chemical Resistance - Slow crack Propagation - Conclusions

41 CONTENT Description and general properties Creep strength of pipe and fitting Chemical resistance Resistance against slow crack Propagation Conclusions

42 AGRU Kunststofftechnik GmbH Ing.-Pesendorfer-Str. 31 A-4540 Bad Hall Austria / EU T +43 (0) F +43 (0) E Subject to errors of typesetting, misprints and modifications. Illustration are generic and for reference only! THANKS FOR YOUR ATTENTION


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