General Processing Information

Transcription

1 COMPOSITE DATA VIBRATHANE General Processing Information Urethane Prepolymers CROMPTON CORPORATION CHEMICAL offers the most versatile line of liquid urethane prepolymers and curatives in the market today. These prepolymers and curatives, called ADIPRENE, VIBRATHANE, AND VIBRACURE respectively, are used worldwide wherever high performance is demanded. TDI- and MDI- terminated resins are available as polyether and polyester types. In addition, CROMPTON CORPORATION CHEMICAL offers medium performance polyether prepolymers for many applications where the ultimate in urethane physical properties is not required. The ADIPRENE products are summarized in a separate bulletin. Ether-Ester Comparison Because of inherent advantages in low hysteresis (heat build-up), polyether VIBRATHANE is recommended for applications where parts undergo dynamic stress. Ether VIBRATHANE yields urethanes having important advantages in resilience, low-temperature performance and hydrolytic stability. Polyester VIBRATHANE gives urethanes with superior cut, tear, and abrasion resistance as well as having an inherent advantage in oil resistance. Polyether VIBRATHANE has lower process viscosity and lower specific gravity compared to polyester VIBRATHANE. MDI-TDI Comparison MDI VIBRATHANE gives lower isocyanate odor than similar TDI types and cures to form urethanes with superior hydrolytic stability. TDI VIBRATHANE has major advantages in processing characteristics, including less sensitivity to moisture, shorter demold time, and milder cure requirements compared to MDI VIBRATHANE.

2 Medium Performance VIBRATHANE Medium performance polyether VIBRATHANE has proven itself in many field applications including certain press-on tires. While not recommended for all applications, it can sometimes match the performance of other urethanes at substantial cost savings. Low VIBRATHANE temperatures (see data sheet) are recommended when processing medium performance VIBRATHANE, especially where adhesion to metal is important. Curatives VIBRATHANE terminated with TDI is normally cured with diamines like 4,4 methylenebis [orthochloroaniline]¹, commonly called MBCA, for urethanes above 70 Shore A, ETHACURE 300 Curative can be used as a MBCA alternative for most applications. Polyol curatives result in softer materials for applications such as printing and coating rolls. Commonly used polyols include VIBRACURE A-931, TP30LW², trimethylopropane³ (TMP) and Pluracol TP VIBRACURE A-931 gives low durometer urethanes with tear strengths superior to other polyols, and is especially useful to avoid heavy use of plasticizer. VIBRATHANE terminated with MDI is usually cured with diol extenders 1,4- butanediol 5 or HQEE 6 for urethanes above 70 Shore A and with VIBRACURE A-120 or VIBRACURE A-125 for elastomers down to 55A. These urethanes have proven to be viable non MBCA systems as established by successful field performance in virtually all major applications. VIBRACURE A-120 is useful with polyether-mdi or TDI VIBRATHANE and VIBRACURE A-125 with polyester-mdi or TDI VIBRATHANE. Many combinations of curatives are useful to meet specific property or processing requirements. FDA Approval VIBRACURE A-125 and/or 1,4 butanediol, as curatives, and VIBRATHANE 6012, 8007, 8094 and 8095, as prepolymers are castable systems having FDA approval for use with wet foods. All VIBRATHANE has approval for use with dry food, but many curatives, including 4,4methylenebis (orthochloroaniline), do not. Consult CROMPTON CORPORATION CHEMICAL for more details 6. The data in this bulletin provide a ready means for comparison of the many VIBRATHANE types. Only data on urethanes above 70 Shore A are presented. Data on lower durometer urethanes as well as more details on specific prepolymers and curatives can be found in the individual VIBRATHANE and VIBRACUE bulletins. 1 Activator M, MVR Corporation 2 Perstorp 3 Celanese Chemical Corporation 4 BASF Wyanodotte Corporation 5 BASF Wyanodotte Corporation 6 Crompton Corporation Chemical Vibrathane Technical Service:

3 Shelf Life VIBRATHANE has a shelf life of two years when stored at temperatures less than 75 F (24 C) and kept sealed from moisture. This is the longest stated shelf life in the industry and is indicative of the excellent stability of VIBRATHANE. VIBRACURE has a shelf life of five years under the same conditions. Heat Stability The NCO content of all prepolymers decreases with time on exposure to heat. The rate of this loss depends on the temperature, the initial NCO content and the type of isocyanate termination. Data are shown below for VIBRATHANE B 601, a 6.3% NCO, TDI-terminated prepolymer. Stability generally decreases slightly as initial NCO content increases. MDI types have similar stability. Tolerable Heating Time as a Function of Temperature VIBRATHANE B 601 Temperature, F ( C) Time Storage 140 (60) 2 weeks 160 (71) 3 days 180 (82) 36 hours 200 (93) 12 hours 212 () 8 hours VIBRATHANE should be stored unopened in its air tight container at F (10-32 C). The isocyanate content of all prepolymers can be decreased by reaction with moisture. It is recommended that partially emptied containers be swept free of atmospheric moisture with dry nitrogen before sealing. Handling Some VIBRATHANE is a liquid at room temperature. This characteristic allows facile handling and easy transfer to casting equipment. All prepolymers have a molecular weight distribution and certain portions may separate on freezing and re-melting. It is recommended that containers of VIBRATHANE or VIBRACURE that require melting be rolled prior to use to ensure homogeneity. Melting should be carried out at F (60-71 C).

4 Toxicity VIBRATHANE contains reactive isocyanate groups and should be handled with care. Avoid inhalation of vapors and skin contact. These materials are known to cause skin irritation and respiratory difficulties on severe or prolonged contact. Safety glasses should be worn and proper ventilation supplied. Normal safety precautions should be taken when handling VIBRACURE. Consult the individual Material Safety Data Sheets (MSDS) and our brochure titled Toxicity and Handling of ADIPRENE/VIBRATHANE for further details. Effect of Curative Level The molder of a cast urethane part has considerable control over which physical properties are maximized. All physical properties are maximized. All physical properties are sensitive to curative level to some extent. At low stoichiometry (less than % theoretical amount of curative) the urethane tends to be more thermoset in nature and above % theory it becomes more thermoplastic. No one curative level maximizes all properties. Consult CROMPTON CORPORATION CHEMICAL if in doubt about the proper curative level for the application. The following physical properties are sensitive to curative level and are affected as described. Hardness & Modulus Relatively unchanged between 85 and percent theory. May decrease below 85% and above %. IN certain systems, especially MDI types, there may be a slight increase in the -105% region. Tensile Strength Usually maximum at 90-95% theory. Tear Strength Maximum around -105%. Significantly lower at 90-95% theory. Abrasion Resistance Falls off rapidly below 90% and above 105% theory. May be affected by additives. Flex Life This is the most sensitive property to curative ratio. Increases dramatically with percent theory; -105% is recommended. Although flex life continues to increase above105%, other properties fall off abruptly above this level. Elongation Increases with percent theory; -105% is recommended to maximize.

5 Compression Set Resistance and Heat Build-up (Hysteresis) Decreases as curative level decreases % theory is recommended where these properties are important. ASTM Testing Procedures Physical property data are listed in the following tables for cured VIBRATHANE. Systems are grouped according to type to allow for facile comparison. Data were obtained using these ASTM procedures: Shore Durometer D-2240 Modulus D-412 Tensile D-412 Elongation D-412 Tear Strength Die C D-624 Split D-470 Bashore Rebound D-2632 Compression Set D-395-B Bell Brittle Point D-2137 Specific Gravity D-792

6 Polyether-TDI VIBRATHANE VIBRATHANE B602 B600 B615 B601 B614 B604 B835 B839 Prepolymer Properties %NCO 3.11+/ / / / / / / / Amine equivalent 1355+/ / / / / / / /-25 F Solid Liquid Liquid Liquid Liquid Liquid Liquid Liquid [24 C] Typical F [ C] cps (Pa s) 650 (0.65) Specific RT Processing Information MBCA¹ Level, pph 9.9 (%) 500 (0.50) 300 (0.30) 200 (0.20) 300 (0.30) 210 (0.21) 300 (0.30) 350 (0.35) (85%) (95%) Vibrathane temp. 200/93 200/93 200/93 180/82 180/82 160/71 180/82 185/85 F/ C MBCA temp. Mold temp. F, C Cure F[ C] Post @ F[ C] 240 F Pot Life (minutes)² Urethane Properties³ Shore Hardness 82A 90A 92A 95A 60D 75D 90A 97A % Modulus, (5.5) (7.6) (9.6) (12.4) (20.7) (34.4) (7.64) (13.1) 300% Modulus, (10.3) (15.2) (17.9) (29.60 (42.0) (15.0) (29.0) Tensile, psi (MPa) 5000 (34.4) 5500 (37.9) 5800 (40.0) 6500 (44.8) 7300 (50.3) 8000 (55.1) 5850 (40.2) 4800 (33.1) Elongation, % Die C Tear, pli (kn/m) 530 (92.8) 600 (105) 550 (96.3) 700 (123) 800 (140) 1070 (187) 440 (77) 760 (133.3) D 470 Tear, pli (kn/m) 75 (13.1) 90 (15.7) (17.5) 130 (22.8) 120 (21.0) 120 (21.0) 900 (15.7) 170 (29.8) D 1938, pli (kn/m) Bashore Rebound, % Compression Set, % Method B 22 C Bell Brittle Point F, C <-80 <-80 <-80 <-80 <-80 <-70 <-94 (<-63) (<63) (<63) (<63) (<63) (<-57 Specific Gravity (cured) % theory (median AE) except where indicated otherwise; for other % theory or different AE; pph MBCA = x (%theory) 2 At recommended VIBRATHANE processing temperature: MBCA at 240 F ( C) 3 Cured 1 hr/212 F ( C) plus 16 hours/158 F (70 C) prepolymer AE

7 Medium Performance Polyether-TDI VIBRATHANE VIBRATHANE B640 B844 B809 B820 B813 B892 B865 B876 Prepolymer Properties %NCO 9.45+/ / / / / / / / Amine equivalent 445+/ / / / / / / /-14 F Solid Liquid Liquid Liquid Liquid Liquid Liquid Liquid [24 C] Typical F [ C] cps (Pa s) (0.10) 300 (0.30) 400 (0.40) 130 (0.13) 80 (0.08) 160 (0.16) (0.1) Specific RT Processing Information MBCA Level¹, pph (95%) 450 (0.45) 20.4 (95%) Vibrathane temp. F/C /70 150/66 140/60 158/70 180/82 180/82 MBCA temp. F/C Mold temp. F, C 230/ 110 Cure F[ C] Post F[ C] Pot Life (minutes) ² Urethane Properties³ Shore Hardness 75D 80A 85A 90A 92A 92A 65D 77D % Modulus, (4.1) (5.0) (7.6) (10.0) (7.38) (22.76) (30) 300% Modulus, (6.9) (9.0) (14.0) (18.0) (13.8) Tensile, psi (MPa) (20.3) 2000 (13.8) 3500 (24.2) 3600 (24.9) 4800 (33.1) 6000 (41.38) 5700 (39) Elongation, % Die C Tear, pli (kn/m) 300 (52.5) 350 (61) 400 (70) 450 (78.75) 493 (86.3) 580 (101.5) 1200 (210) D 470 Tear, pli (kn/m) 70 (12.2) 70 (12.2) 80 (14.0) 90 (15.8) 90 (15.8) 120 (21.0) 160 (28) D 1938, pli (kn/m) 530 (93) Bashore Rebound, % Compression Set, % Method B 22 C Bell Brittle Point F, C 4-50/-46-50/-46-44/ / Specific Gravity (cured) 1 90% theory (median AE) except where indicated otherwise; for other % theory or different AE; pph MBCA = x (%theory) 2 At recommended VIBRATHANE processing temperature: MBCA at 240 F ( C) 3 Cured 1 hr/212 F ( C) plus 16 hours/158 F (70 C) prepolymer AE

8 Polyether-MDI VIBRATHANE VIBRATHANE B625 B635 B821 B670 B836 Prepolymer Properties %NCO Amine equivalent F Solid Liquid Liquid Liquid Liquid [24 C] Typical F [ C] cps (Pa s) 750 (0.75) 430 (0.43) 550 (0.55) 150 (0.15) 400 (0.40) Processing Information 1,4-butanediol Level¹, pph Curative temp. F, C 140 (60) 140 (60) 140 (60) 75 (24) 140 (60) Vibrathane temp. 200 (93) 180 (82) 180 (82) 140 (60) 180 (82) F, C Pot Life (minutes) Urethane Properties 2 Shore Hardness 85A 89A 90A 53D 95A % Modulus, psi (MPa) 820 (5.6) 1110 (7.6) 0 (6.9) 2300 (15.9) 1345 (9.3) 300% Modulus, 1900 (13.1) 2800 (19.3) 2500 (17.2) 3400 (23.5) 2635 (18.1) Tensile, psi (MPa) 5400 (37.2) 6110 (42.1) 4800 (33.1) 7500 (51.8) 5460 (37.6) Elongation, % Die C Tear, pli (kn/m) 540 (94.5) 600 (105) 550 (96.2) 750 (131) 700 (122.5) D 470 Tear, pli (kn/m) 80 (14) 90 (15.8) 85 (14.8) 140 (24.5) 155 (27.1) Bashore Rebound, % Compression Set, % Method B 22 C Bell Brittle Point F/ C <-80/<-63 <-80/<-63 <-80/<-63 <-80/<-63 <-80/<-63 Specific Gravity (cured) 1. 95% theory (median AE) except where indicated otherwise; for other % theory or different AE; pph curative = (curative EW) x (%theory) ; many of these prepolymers may be cured with other materials such as HQEE. prepolymer AE 2. Cured 16 hours/ F ( C)

9 Polyester-TDI VIBRATHANE VIBRATHANE Prepolymer Properties %NCO Amine equivalent F Solid Solid Solid Liquid Liquid Solid Solid [24 C] Typical F [ C] cps (Pa s) 750 (0.75) 0 (1.0) 800 (0.80) 850 (0.85) 800 (0.80) 500 (0.50) 350 (0.35) Processing Information MBCA Level¹, pph Vibrathane temp. F/C 200/93 200/39 200/93 Pot Life (minutes) ² Urethane Properties³ Shore Hardness 62A 74A 80A 85A 87A 90A 50D % Modulus, (2.5) 600 (4.1) (1.9) (5.03) (6.9) (7.6) (11.7) 300% Modulus, (3.2) 600 (4.1) (2.7) (8.72) (10.3) (14.1) (23.3) Tensile, psi (MPa) 3500 (24.2) 5450 (37.6) 6600 (45.3) 6197 (42.7) 6500 (44.6) 7200 (49.4) 7400 (50.8) Elongation, % Die C Tear, pli (kn/m) 180 (31.4) 260 (45.5) 475 (83.1) 497 (87.0) 500 (87.5) 610 (107) 700 (123) D 470 Tear, pli (kn/m) 25 (4.4) 70 (12.2) 120 (21.0) 116 (20.3) 105 (18.4) 140 (24.5) 175 (30.6) Bashore Rebound, % Compression Set, % Method B 22 C Bell Brittle Point F/ C -70/-57-60/-51-60/-51-73/-58-75/-59-50/-46-45/-43 Specific Gravity (cured) % theory (median AE) except where indicated otherwise; for other % theory or different AE; pph MBCA = x (%theory) 2. At recommended VIBRATHANE processing temperature: MBCA at 240 F ( C) prepolymer AE 3. Cured 1 hr/212 F ( C) plus 16 hours/158 F (70 C)

10 Polyester-MDI VIBRATHANE VIBRATHANE U Prepolymer Properties %NCO Amine equivalent F Liquid Liquid Solid Solid [24 C] Typical Viscosity 0 (1.0) 0 (1.0) 650 (0.65) 300 F [ C] cps (Pa s) Processing Information 1,4 butanediol Level¹, pph Curative temp. F, C 140 (60) (38) 140 (60) 140 (60) Vibrathane temp F, C 200 (93) 180 (82) 200 (93) 200 (93) Pot Life (minutes) Urethane Properties 2 Shore Hardness 85A 85A 85A 95A % Modulus, 730 (5.0) 900 (5.5) 800 (5.5) 2000 (13.9) 300% Modulus, 1620 (11.2) 1970 (13.6) 2000 ( (26.9) Tensile, psi (MPa) 6240 (43.0) 6300 (43.4) 7200 (49.6) 7500 (51.8) Elongation, % Die C Tear, pli (kn/m) 525 (91.9) 550 (96.3) 620 (108.5) 800 (140) D 470 Tear, pli (kn/m) 120 (21.0) 140 (24.5) 140 (24.5) 160 (28.0) Bashore Rebound, % Compression Set, % Method B 22 hrs C Bell Brittle Point -60/-51-50/-46-50/-46 F/ C Specific Gravity (cured) theory (median AE) except where indicated otherwise; for other % theory or different AE; pph curative = (curative EW) x (%theory) ; many of these prepolymers may be cured with other materials such as HQEE. prepolymer AE 2 Cured 16 hours/ F ( C) Rev. 9/01 ljs