Curing Resins
Curing resins are heat reactive resins made from octylphenol and formaldehyde.
They have been developed to cure IIR and NR. Standard butyl curing resins need to
be used in combination with halogen and zinc donors. Bromine modifed curing resins
for butyls do not require a halogen donor. Also available is an unmodifed resin
developed specifcally to cure natural rubber. Akrochem’s curing resins for this
application and others like it are as follows:
UNMODIFIED CURING RESINS FOR BUTYL
SP-1044 (P-146)
SP-1044 is a heat reactive resin made from octylphenol and formaldehyde designed
for the cure of IIR by the resin cure system. SP-1044 used in combination with halogen
and zinc donors, yields butyl vulcanizates with outstanding resistance to high heat and
compression set. In addition, these vulcanizates are non-blooming, non-staining and
have high modulus values. The octyl group also makes SP-1044 compatible with other
elastomers, and can be used to make cements offering a wide range of properties.
SP-1045 (P-101)
SP-1045 is a heat reactive resin made from octylphenol and formaldehyde designed for the
cure of IIR by the resin cure system. The octyl group also makes SP-1045 compatible with
other elastomers, and can be used to make cements offering a wide range of properties.
SP-1045 used in combination with halogen and zinc donors, yields butyl vulcanizates with
outstanding resistance to high heat and compression set. In addition, these vulcanizates
are non-blooming, non-staining and have high modulus values.
MODIFIED CURING RESINS FOR BUTYL
SP-1056 (P-125)
SP-1056 is a heat reactive, brominated (6–7.5%) octylphenol-formaldehyde resin that
contains methylol groups. Due to its higher bromine content, compounds with SP-1056
will cure faster and have less scorch safety than those that utilize SP-1055. SP-1056 may
be used with IIR or other unsaturated elastomers with or without functionality. The
presence of functionality allows for a faster cure. SP-1056 also does not require a halogen
donor. The use of brominated resins in compounding is especially effective when rubber
may be exposed to heat or repeated use. The rubber will not deteriorate as quickly as
rubber crosslinked with other curing agents.
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