CILBOND® 49SF

BENEFITS OF CILBOND 49SF BONDING CAPABILITIES

• CILBOND® 49SF is a one coat bonding system for PU’s and TPU’S to all metals during the curing process.
• CILBOND® 49SF will also bond PU’s and TPU’s to epoxies and fibreglass reinforced plastics, polyamides and other engineering thermoplastics, such as Hytrel® , PBT, PET, PPS, PPO, PEEK, PES, etc.

IN-SERVICE BENEFITS

• CILBOND® 49SF exhibits good resistance to static and dynamic fatigue and bonds survive in fluids such as fuels, oils including all types of lubricants, glycols, inks, lacquers, paints and many cleaning solvents, though for a maximum resistance to aggressive solvents, the use of Cilbond 49SF and Cilcure B is recommended – see below. (Cilcure B is a liquid form of diphenylmethane diisocyanate with a selected functionality and is used to improve the environmental resistance of bonded parts).
• CILBOND® 49SF has good hot and cold water resistance, as illustrated by tests where polyether/MbOCA or polyester/Ethacure cured compounds bonded to mild steel showed 100% rubber tear when peel tested after total immersion for 28 days in water at 80°C. Bonds made with Cilbond 49SF are impact resistant and not brittle down to at least -40°C
• When CILBOND® 49SF is used as a 2 part bonding agent with Cilcure B, it has specific benefits and uses, especially for lower temperature bonding and for exceptional resistance to aqueous conditions, such as boiling water and for long-term exposure to predominantly wet conditions. This system is also suited for higher heat resistance to 180°C and CILBOND® 49SF + Cilcure B is probably more versatile when used as a primer under Cilbond 49SF.

PROCESSING BENEFITS

• CILBOND® 49SF exhibits the capability to withstand long pre-bake cycles and with good control of metal preparation and bonding agent application and using extended pre-bake conditions (see below) the bonds can survive up to ca. 130°C in static and dynamic conditions.

• One-coat solution
• High-temperature resistance in service
• High pre-bake resistance
• Extreme chemical resistance
• Bonds wide range of PU systems
• Sprayable with CILBOND Diluent 4000
•  Clear or pigmented color offerings
• Reduce process cost and increased productivity
•  Improve performance on high-temp applications
•  Reduce rework and expand process window
•  Protection of substrate to extend product life
•  Reduce product complexity
•  Allows for automation and uniform coating
•  Eliminates visual bond line or improve QC process with pigment

• CILBOND® 49SF will bond castable and thermoplastic polyurethanes to metals and plastics at temperatures of 70°C or above, though best results are achieved at >85°C, particularly if the component is going to be subjected to a severe environment. It is especially suitable for use in dynamic conditions where hydrolytic stability is important.
• When bonding MDI Quasi Prepolymer Systems and where the cast PU bond line may not reach much above 70°C, it is recommended that after applying the Cilbond 49SF, the coated metal parts are dried thoroughly and then pre-baked for an absolute minimum of 1 hr at 85°C - 100°C to ensure a good cement to metal bond.

End-use Applications Of CILBOND® 49SF
End applications for products using CILBOND® 49SF include :

•  Rollers for the paper and textile industries.
• Solid tyres.
• Carriage wheels.
• Dunnage.
• Pipe linings and pipe coatings.
• Reinforced screen decks.
• Any product with an engineering bond between a PU elastomer and a metal or plastic substrate.

When To Use CILBOND® 49SF + Cilcure B

• If bond line temperatures are likely to be below 70°C, or if a pre-bake of the coated substrates is not feasible, or if the in-service environment is extreme, then consider the use of Cilbond 48 (see separate Technical Data Sheet) or CILBOND® 49SF + Cilcure B.
• Applications for CILBOND® 49SF + Cilcure B include low-temperature casting or spraying of PU’s, the rotational casting of small and medium sized rollers and applications involving dynamic fatigue at temperatures of ≥140°C.
• CIL strongly recommend CILBOND® 49SF + Cilcure B for applications that involve continuous use in aqueous environments. The resistance of PU to metal bonds made with Cilbond 49SF+ Cilcure B at a ratio of 100:10 and subjected to water at <50°C is predicted to be ≥ 20 years and the use of CILBOND® 49SF as a cover coat iscovered below.
• CILBOND® 49SF + Cilcure B yields bonds capable of withstanding boiling water for up to 105°C for ≥200 hours.
• CILBOND® 49SF + Cilcure B gives improved adhesion to many substrates; especially epoxy resins, such as FBE, GRP/FRP, glass, ceramics, etc.
• CILBOND® 49SF + Cilcure B is recommended for highly plasticised PU systems and for systems where the curing agent could potentially solvate the bonding agent layer, such as trans CHDI/CHDM PU systems.
• CILBOND® 49SF + Cilcure B or CILBOND® 49SF + Cilcure B as a primer under Cilbond 49SF produce bonds capable of withstanding temperature of up to 180°C.

How To Use CILBOND® 49SF With Cilcure B

• The standard mix ratio of CILBOND® 49SF + Cilcure B is 100:10 by weight, but for some applications, it may be possible to use a mix ratio down to 100:5, especially for very fast cure 2 component PU’s.
• Cilbond 49SF (100 parts by weight) should be mixed with Cilcure B (10 parts by weight), preferably by adding the Cilcure B to the Cilbond 49SF, whilst stirring. Stir well until homogeneous. Allow to stand for a few minutes, stir again and it is then ready for use.
• Ideally make up sufficient mix to last ca. 8 hours, which is the recommended pot life. Dispose of any material after this, especially if it has a gelatinous nature.
• Apply this mixture following the same procedure as for CILBOND® 49SF, except that a pre-bake is now not a definite requirement, though the dried parts must be brought up to the moulding temperature or to ≥50°C prior to casting the PU. If parts are dried at ≥70°C, then best bonding is achieved, even if the metals are at ≥50°C when the PU is cast.
• A high temperature pre-bake is possible, but it must be stressed that long pre-bakes must be avoided, though the system will tolerate up to ca. 4 hours pre-bake at 100-110°C without any adverse effect on bonding.
• Longer and higher temperature pre-bakes may be possible, depending on PU type, i.e. Vulkollan®. However this must be fully validated to ascertain reproducible results.

End Use Applications Of CILBOND® 49SF + Cilcure B
Applications benefiting from Cilbond 49SF + Cilcure B include:

• Low temperature applied spray coatings and any difficult to bond very fast curing PU.
• Low temperature casting of PU’s, especially rotational casting of small and medium sized rollers and pipe, where some limited heat input is possible
• Applications required to withstand boiling water, hot water, where bonded items are continually in aqueous environments or where the bonds must survive up to 180°C.
• Applications where aggressive solvents are employed.

CILBOND® 49SF + Cilcure B As A Primer Under CILBOND® 49SF

• This combination is used for those applications where the benefits of Cilbond 49SF + Cilcure B as a primer can be combined with the long open time and pre-bake resistance of Cilbond 49SF, with the added advantage that this system gives bonds with the same heat resistance as CILBOND® 49SF + Cilcure B on its own.
• A primer coat of CILBOND® 49SF + Cilcure B is 100:10 by weight is applied to well prepared metals to give a minimum of 15μ dry coating thickness and dried for 1-2 hrs at ambient temperature or with gentle applied heat. A second coat of Cilbond 49SF is applied to give a total coating thickness of ≥25μ and dried thoroughly.
• This system is now treated as though it was a dried coating of Cilbond 49SF to produce the bonded component and bond performance is equal to using CILBOND® 49SF + Cilcure B at 100:10 by weight.

CILBOND® 49SF is supplied in 10L, 25L and 200L containers. 250ml trial samples are also available upon request.

Coated parts may be stored for long periods of time (several weeks) provided they are protected from dust and moisture.

Shelf Life: 24 Months from Date of Manufacture.