ADIPRENE LFM E265 Low Free MDI-Terminated Polyether Prepolymer
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1 ADIPRENE LFM E265 Low Free MDI-Terminated Polyether Prepolymer ADIPRENE Low Free MDI prepolymers are available in polyether, polyester and polycaprolactone compositions. In comparison to conventional MDI prepolymers, the level of Free MDI is less than 1%. Benefits of ADIPRENE LF MDI Prepolymers: Unsurpassed Health & Safety Excellent Performance Superior Processing & High Productivity Unsurpassed Health & Safety ADIPRENE Low Free MDI prepolymers have low free MDI content (1%) for improved health and safety during handling and processing. The ADIPRENE LF technology enables Chemtura to create a range of complete LF MDI-based systems, including the prepolymer, curative, and catalyst, with a non-toxic classification. Excellent Performance These systems are often selected as an alternative for TDI and LF TDI-based prepolymers cured with MbOCA. They are especially suited for applications requiring higher end performance, including rollers, mining, oil & gas, and tires & wheels. Superior Processing & High Productivity ADIPRENE Low Free MDI prepolymers cured with curatives offer exceptionally low viscosity and extended pot life up to 8 minutes without a catalyst, enabling the casting of very large and complex parts. With a catalyst, these systems result in shorter demold times which offer the processor the ability to achieve very high productivity. They can be processed using meter-mix machines without the need for retrofitting. Page 1 of 5
2 Curative Properties Equivalent Weight Appearance at Room Temperature Unit 2101 A White pellet White solid Prepolymer Meltdown Procedure ADIPRENE Low Free MDI prepolymers must be pre-heated to C for processing. Devices such as melting ovens, thermostatically controlled warming blankets or drum heaters can be used to pre-heat these prepolymers. Approximate pre-heat times at 70 C are: % Theory % Melting Point Processing Temperture C ( F) Curative Processing curatives used with ADIPRENE LF MDI must be processed above their melting temperatures (>120 C) to ensure that process lines, pumps and valves do not block. They can be dried by melting and placing under vacuum. A260 is a blend and must be mixed to ensure homogeneity. Mixing can be done prior to uploading to the meter-mix machine tank or within the curative tank via recirculating pump. Formulation Stoichiometry ( ) ( ) C ( F) 120 (248) 120 (248) When reacting ADIPRENE Low Free MDI prepolymers with curatives, a value of 95% theory is typically used to achieve an optimal balance of physical properties of the cured polyurethane elastomer. Varying the formulation stoichiometry will enable maximization of specific properties and characteristics Kgs / 1 pail for hours 204 Kgs / 1 drum for hours Prepolymer exposed to temperatures lower than 24 C during shipment and/or storage may require longer meltdown times. Note: Do not loosen the pail or drum to relieve the pressure. This will allow moisture into the prepolymer which can damage the material. Heat Stability The NCO content of ADIPRENE Low Free MDI prepolymers decreases with time upon exposure to heat. Prolonged heat exposure will result in lower than expected final hardness of the cured elastomer and longer demold times. Maximum recommended heating times as a function of temperature are shown below. Temperature Duration 70 C 2 Days 85 C 36 Hours Catalysts ADIPRENE Low Free MDI prepolymers cured with curatives require catalysis. Chemtura offers VIBRACAT catalysts. Depending on the demolding time required, the most appropriate grade will be recommended by the Chemtura Technical Service team. Page 2 of 5
3 Meter-Mix Machine Turbine Speed Due to the very low viscosity of these ADIPRENE LF MDI systems, the turbine speed for meter-mix machines should be within the region of rpm to avoid the creation of micro-bubbles within the mixing chamber. The design of the mixing turbine and the flow output of the machine should be considered when deciding on mixing turbine speed. Mold Temperatures & Cure Profile Factors such as final component size, material flow path length & complexity, and required productivity will influence the mold temperature decision. Typical mold and post cure temperatures are C. Typical post cure conditions are 16 hours at C. Demold Time Demolding times are depending on part thickness and material formulation, including use of catalysts. Industrial Hygiene For detailed industrial hygiene information for all ADIPRENE Low Free MDI prepolymers and curatives included in this document, please refer to the relevant Safety Data Sheet (SDS). For more detailed information on the use of DURACURE curatives or VIBRACAT catalysts, please refer to the appropriate technical data sheets. Page 3 of 5
4 Prepolymer Properties Unit Typical Value NCO Range % Amine Equivalent Free MDI Content % <1.0 Brookfield 50 C Centipoise 3900 Brookfield 70 C Centipoise 1450 Brookfield 100 C Centipoise C g/cm C White solid Physical Properties DIN Standard Unit Typical Value Curative 2101 Hardness DIN Shore A or D 80A 50% Modulus DIN s2 MPa % Modulus DIN s2 MPa % Modulus DIN s2 MPa % Modulus DIN s2 MPa 7.8 Stress at Break DIN s2 MPa 31.5 Strain at Break DIN s2 % 763 Tear Strength DIN / ISO 34-1 kn/m 62.1 Abrasion Loss DIN Method A/ ISO 4649 mm 3 94 Rebound Resilience DIN % 79 Specific Gravity DIN Physical Properties DIN Standard Unit Typical Value Curative A260 Hardness DIN Shore A or D 78A 50% Modulus DIN s2 MPa % Modulus DIN s2 MPa % Modulus DIN s2 MPa % Modulus DIN s2 MPa 7.2 Stress at Break DIN s2 MPa 31.2 Strain at Break DIN s2 % 707 Tear Strength DIN / ISO 34-1 kn/m 53.8 Abrasion Loss DIN Method A/ ISO 4649 mm 3 92 Rebound Resilience DIN % 76 Specific Gravity DIN Page 4 of 5
5 The information contained herein relates to a specific Chemtura product and its use, and is based on information available as of the date hereof. Additional information relating to the product can be obtained from the pertinent Material Safety Data Sheets. NOTHING IN THIS TECHNICAL DATA SHEET SHALL BE CONSTRUED TO CONSTITUTE A REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, REGARDING THE PRODUCTS CHARACTERISTICS, USE, QUALITY, SAFETY, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Nothing contained herein shall constitute permission or recommendation to practice any intellectual property without the permission of the owner. The Chemtura logo is a trademark of Chemtura Corporation or one of its subsidiaries. Copyright 2016 Chemtura Corporation. All rights reserved. North America customer.care@chemtura.com Europe, Middle East & Africa emea.export@chemtura.com South & Central America Atendimento.cliente@chemtura.com Asia Pacific orders.apac@chemtura.com Page 5 of 5
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