Bis Peroxide is an organic peroxide of the dialkyl class, with an excellent performance on cross-linking/curing of different types of elastomers, which is widely used in the market for being odorless, although it causes BLOOMING in manufactured goods.
Retilox being always attentive to the needs of the market, developed a unique BIS PEROXIDE WITHOUT BLOOMING.
RETILOX BIS F 40 SB has superior characteristics than of the BIS CONVENTIONAL PEROXIDE (RETILOX BIS F 40 A/ LUPEROX 802 G/ PERKADOX 14-40), to cure EVA and EPDM, having a very competitive cost, and it does not cause Blooming.
To learn more, please contact one of our consultants by phone: 11 4705-9460.
Organic peroxides are currently used by the industry transforming plastomers and elastomers in cross-linking of different types of polymers replacing the conventional system via sulfur, for being less aggressive to the environment and achieve the strictest technical specifications imposed by the market.
They are products which decompose at a certain temperature, to generate free radicals with energy capable of creating polymeric radicals, and when they react with each other, they produce chemical bonds of carbon-carbon type, quite stable and resistant to heat, named “cross-links” or “cross-linking”.
From the thermal stability standpoint, cross-linking with organic peroxides, for having greater bonding strength, is much more stable than the binding of carbon/sulfur/carbon and gives good properties with regard to resistance to aging. But the bonds that are formed through the system via vulcanizing sulfur are of type C – S or C – S – C, and their binding energies tend to break or rearrange when the polymer is subjected to heat or mechanical stress.
insulation and wire and cable covers (made with PE, EPM, EPDM, EVA, CPE, CR);
fittings and cross-linked profiles in bath or salt (LCM) or steam (PE, EPDM, CR);
fittings and cross-linked profiles in hot air tunnels (Retilox Technology);
hoses and tubes, free of extractable materials at high temperatures (158ºC); for example, radiators in EPDM, NBR;
soles, footwear insoles, mid-soles, sandals, microporous, compacted or expanded (EVA, PE, SBR, blends, etc.);
cylinder coating (EPDM, NBR, silicone);
rotational Molding (PE, EVA);
medical supplies, such as silicone tubes;
expanded articles with closed cell structure (PE, EVA, CM);
molded and injected articles in general.
Modified organic peroxides
Always a step ahead in innovation and R&D, Retilox continuously develops especially modified peroxides, that offer elastomer transformers the best physical properties in the artifact and productivity gains in relation to conventional organic peroxides (dicumyl 99% and BIS peroxide) and the vulcanization system by sulfur and accelerators.
Link: Learn about our line of Special Organic Peroxides
Dicumyl Peroxide is an organic dialkyl peroxide commonly used for cross-linking/curing of elastomers and plastomers, as well as being used as a polymerization initiator for polystyrene and as a curing agent for unsaturated polyesters.
As a replacement for sulfur, it is the curing agent most commonly used in the most diverse rubber industries; when there is no need to produce odorless artifacts, for having a good cure speed and mainly low cost when compared to other types of organic peroxides.
Characteristics of conventional dicumyl peroxide
good cross-linking/curing speed;
high cross-linking/curing yield;
characteristic odor in the product;
good safety to pre-cross-linking/curing;
Maximum mixing temperature: 135ºC;
Ideal cross-linking temperature: 179ºC;
Modified dicumyl peroxides
Retilox, through its continuous investment in R&D and pioneering the development of modified organic peroxides, offers special dicumyl peroxides grades, which substitutes the BIS peroxide with productivity above 30% in relation to the Conventional Bis, mainly eliminating the characteristic odor of the conventional dicumyl peroxide at 40% or 99%. Check out some of our special grades below:
RETILOX DCP 40 SAP – odorless dicumyl peroxide offers excellent productivity (about 30% over conventional Bis), safer scorch and better physical characteristics such as abrasion and bonding.
RETILOX D 40 INJECT F – odorless, ultra-fast dicumyl peroxide with excellent productivity and low cost.
RETILOX DCB 40 – dicumyl peroxide for general use with excellent productivity, odorless and without blooming.
The use of an organic peroxide as a rubber cross-linking agent was reported for the first time by Ostromislenski in 1915. In this experimental study, dibenzoyl peroxide, which at the time, was used in the treatment of flour, was used in the vulcanization of natural rubber. This new method had its limitations because of its vulcanization process with low heat resistance.
In the early 50s, with the advent of dicumyl peroxide and its effective commercialization, it began to be used in the cross-linking of silicone rubber and saturated polymers like EPM, silicone and some polyolefins (polyethylene).
The constant evolution in R&D on cross-linking via peroxides allowed a rapid expansion in the use of organic peroxides in the most diverse polymers and temperature ranges.
Link: Click here and learn about our line of special peroxides
Organic peroxides are used for the cross-linking of various types of polymers, such as SILICONE, EPDM, EPM, IIR, ECO, EPR, NR, NBR, BR, SBR, SSBR, ABS, EVA, SBS, SIS, POE, UP, PU in applications, as follows:
– insulation and cover of wires and cables;
– cross-linked linings and profiles in bath or salt or steam;
– cross-linked linings and profiles in hot air tunnel (exclusive Retilox technology);
– hoses and tubes, free of extractive materials, in high temperatures (158ºC);
– soles, insoles, mid-soles, microporous, compacted or expanded sandals;
– coating of cylinders;
– rotational molding;
– modified asphalts;
– medical articles, such as silicone tubes;
– expanded articles with closed cell structure;
– molded and injected articles in general.
Link: Find the most suitable peroxide for your application
The constant and rapid technological advance, coupled with increasingly rigid specifications and greater awareness of toxicological problems, it has led the plastics and rubber processing industry to rapidly replace the conventional vulcanization of elastomers and plastomers via sulfur and accelerators with cross-linking/curing by organic peroxides.
Peroxides and their decomposition products are non-toxic and meet the requirements of industrial hygiene, in addition to adding better mechanical properties to the artifacts and productivity to the transformers, as follows:
– possibility of blend between polymers;
– better resistance to permanent deformation;
– special types resistant to oxygen;
– better resistance to aging;
– high thermal resistance;
– excellent stability of ready compound;
– brighter colors and whiter white;
– non-staining characteristics;
– fast vulcanization cycles;
– better mass homogeneity;
– possibility to accelerate directly in the bambury;
– significant reduction of mass mixing items;
– economy due to absence of pre-vulcanized masses;
– reduction of items in stock;
– optimization and higher productivity;
– cross-linked parts can be recycled without cryogenic or autoclaving;
– minor overall costs.
Link: Click here for more information
Retilox offers excellent options for EVA injection, with products that add productivity, quality and cost-benefit to transformers.
– RETILOX DCP 40 SAP – odorless dicumyl peroxide offers excellent productivity (about 30% over conventional Bis), safer scorch and better physical characteristics such as abrasion and bonding.
– RETILOX D 40 INJECT F – odorless, ultra-fast dicumyl peroxide with excellent productivity and low cost.
– RETILOX BIS F0 SB – exclusive modified dialyzed peroxide with excellent productivity, odorless and without blooming.
Link: Click here for more information
Retilox offers excellent options for replacement of EVA injected by poured EVA with numerous advantages, enabling the production of EVA artifacts with higher productivity, better quality and overall cost savings.
Some advantages of using EVA Revolution® Technology:
– reduces EVA curing time from 360 seconds to less than 180 seconds;
– possibility of increasing the use of high viscosity rubbers in blends with EVA, since it is not possible in the injection system due to limitations in conventional extruders;
– possibility to produce artifacts with more than two colors;
– near total elimination of the process losses, obtaining better physical properties in the artifacts, since the poured one does not pass through posterior shearing, not causing pre-cross-linking in the gun as in the direct injection system;
– less unit operations when compared to the direct injection process, allowing the optimization of factory space, in addition to reducing the quantity of materials in the weighing;
– reduction in the consumption of material, since the formation of the “injection branch” does not happen;
– elimination of all variations by injection control, flow rate, injection speed, among others;
– reduction in the consumption of electricity, as it does not need the injectors;
– easy to produce the poured one in conventional equipment (rubber presses), with slight adjustments.
A leader in technologies for cross-linking, Retilox offers special additives for rotational molding (PE), providing tanks, industrial containers, water tanks and agricultural technical parts, among others, impact resistance at -40ºC and weight reduction, in compliance with the most rigid specifications regarding aging, impermeability and atoxicidity, without any kind of damage in the resin recyclability.
Link Click here and learn about our additives for rotational molding
Retilox has excellent cost-effective alternatives for the increase of polypropylene melt index (PP) that are already used by several transformers with excellent results.
Whether in extrusion or injection, Retilox has special additives that offer the possibility of increasing the melt index of the recycled PP without significant degradation. The use of the additive may range from 0.1% to 0.5% on the mixture, depending on how much it is desired to be attained in fluidity.
Link: Click here and learn about our additives for PP
Retilox has excellent cost-effective alternatives for the increase of index polypropylene fluidity (PP) that are already used by several transformers with excellent results.
Whether in extrusion or injection, Retilox has special additives that offer the possibility of increasing the index of fluidity of the recycled PP without significant degradation. The use of the additive may range from 0.1% to 0.5% on the mixture, depending on how much it is desired to be attained in fluidity.
Link: Click here and learn about our Additives for PP