Flame retardants for polymers
Ecopiren in TPO roofing membranes Ecopiren in PVC wire and cable formulations Ecopiren in halogen-free wire and cable formulations Ecopiren in polyamide compounds Ecopiren as ATH replacement Ecopiren in ACP
- Metallurgical fluxFlux for steelmaking in converter Flux for steelmaking in Electric arc furnace
- Waste water and gas treatmentPrimary and secondary treatment Odor control and sludge dewatering Gas purification Gas desulfurization
- Technical rubber products
- Component for glass production
- Magnesium hydroxide in the pulp and paper industryChemical pulping Reagent for pulp bleaching Mechanical pulp bleaching
- Anti-caking agent for mineral fertilizersAnti-caking agent for ammonium nitrate Anti-caking agent for complex fertilizers
- FertilizersMagnesium fertilizer (improver) Liquid complex fertilizers
- Animal FeedMagnesium additive in feed for cattle Magnesium additive in feed for pigs
- Component for the production of magnesium products
Technical rubber products
MagPro® 140 is a high activity magnesium oxide with a precisely defined particle size distribution. It is produced by indirect calcination of fine milled magnesium hydroxide. This process safeguards a very high level of uniformity of both activity and particle size.
MagPro® 140 is added in rubbers to play the role of (a) acid scavenger, (b) scorch controller (vulcanization retarder), (c) vulcanization (or curing) agent, (d) vulcanization accelerator activator, (e) heat stabilizer. All these functions are exhibited during vulcanization and/or storage of intermediate or final products and in some cases during the service life of the article. MagPro® 140 has to be incorporated during a compounding or a pre-compounded additive process in order for the elastomer to be able to be crosslinked at a later stage.
In below table the various applications of MgO in rubber technology are listed:
Rubber MgO Application
1 Polychloroprene (CR)
- crosslinking agent,
- retarder/scorch control,
- acid scavenger,
- heat stabilizer
Adhesives, automotive (V-belts, timing belts, gaskets for door, deck and trunk), wire&cable, petroleum exploration, production and distribution (pipeline pigs, seals, gaskets, hoses), construction (gaskets, roof covering, modified asphalt), shoes, foam mattresses (latex) 2
acid scavenger Tire inner tubes, tire air barriers, air cushions, pneumatic springs, accumulator bags, air bellows, tire expandable bladders, high temperature service hoses and conveyor belts 3 Chlorobutyl Rubber (CIIR) retarder/scorch control Innerliners for tubeless tires, tire sidewalls, heat-resistant truck inner tubes, hoses, gaskets, conveyor belts, adhesives and sealants, tire curing bags, tank linings, truckcab mounts, aircraft engine mounts, rail pads, bridge bearing pads, pharmaceutical stoppers, appliance parts 4 Bromobutyl Rubber (BIIR) retarder/scorch control Tire innerliners, radial-tire black sidewalls, pharmaceutical closures, heat resistant conveyor belts, chemical resistant tank linings, curable contact cements to rubber-rubber adhesion 5
acid scavenger Oil and chemical resistant hoses (automotive, marine, aircraft fuel lines, bulk-fule transfer, chemical transfer, food handling, dairy and creamery), oil-drilling items, cements, adhesives, gaskets, brake linings 6 Chlorosulfonated Polyethylene (CSM)
- accelerator activator,
- acid scavenger,
- heat stabilizer
Coating rubber films (roofs, tarpaulins, pond liners), caulks and adhesives, wire&cable, air-conditioner hoses, spark-plug boots, rollers, automotive gaskets 7 FluoroElastomers (FKM) acid scavenger Valve seals, O-rings, gaskets, joints, hose, wire & cable, automotive seals, fuel handling systems, aerospace, oil-well seals and packers, oil-suction delivery hoses, tank linings, seals for scientific instruments 8 Polysulfide Elastomers crosslinking agent Printing and lacquer coating industries, hose tubes, gaskets, gas-meter diaphragms, sealants (aircraft, automobiles), coatings 9 Epichlorohydrin Polymers acid scavenger Fuel-air conditioning system components (hose, diaphragms, seals, gaskets, O-rings), vibration isolators, belts, rollers 10 Chlorinated Polyethylene (CPE) acid scavenger Hoses, cables, automotive tubing, boots, dust covers 11 Phosphonitrilic Fluoroelastomers (PNF) increases modulus and adhesion to metals Aerospace, military, petrochemical and other critical applications
Magnesium oxide is most widely used in Polychloroprene (CR), a synthetic rubber invented by DuPont and commercially announced under the trade name of Neoprene® in 1931. Some known applications include automotive components, wire&cable, hoses, seals, gaskets, roofing and adhesives. CR grades are characterized by toughness, wide operating temperature range, resistance to oils, heat, ozone and weathering, as well as inherent flame retardant properties due to chlorine content.
The various grades of Neoprene fall within three general types, G, W and T. Within each type there is a series of grades with specific properties for a variety of processing conditions, compounding considerations, vulcanization systems and product applications.
Use of 4 parts MgO and 5 parts ZnO generally results in a good balance of processing safety and cure rate and is typically applied. Higher levels of magnesia may be desirable for high temperature molding, especially injection molding. Lower levels of MgO (2 pphr) may be used in some continuous vulcanization cure systems.
The basic compound composition of using MagPro® in neoprene is presented below:
Neoprene GRT 100 100 Regal SRF-N772 (carbon black) 25 25 Stearic acid 0.5 0.5 MgO 4 4 ODPA (Antioxidant) 1 1 Zinc oxide RS 5 5 Total phr lab 135.5 135.5 Properties
Sample name MagPro 140® Competetive synthetic magnesia Mooney viscosity, ML (1+4) 100° C Initial, (MU) 75.3 74 Mooney viscosity, (MU) 52.7 54.4 Original mechanical properties Hardness, IRGD, 10 mm sample, (°,SN) 62 62 Tensile strength at max, (MPa) 24.7 24.5 Elongation at break, (%) 582 580 Hot-air ageing, 1 week at 100° C Variation in tensile strength, (%) -11 -14 Variation in elongation, (%) -29 -38
The primary function of MgO in Neoprene compounds is to neutralize trace hydrogen chloride liberated by the polymer during processing vulcanization (also termed crosslinking or curing), heat aging or service. By neutralizing the hydrogen chloride, magnesium oxide prevents auto- catalytic decomposition, resulting in greater stability. MgO also takes part in the vulcanization process regulating scorch.
Advantages of MagPro®
- combines the best characteristics of both synthetic and natural magnesia
- does not contain any volatiles like chlorides and sulphates
- has a high and uniform reactivity for perfect reproducibility
- has a precisely defined particle size distribution
- has short delivery times: produced in Europe and distributed through a dense sales network
Contact us, our experts will provide you with advice on the use of the productMagPro®
+7 495 789 65 30 firstname.lastname@example.org
Ecopiren — effective mineral flame retardant and smoke absorber for polymer composites based on magnesium hydroxide crushed
AktiMax — new environmentally friendly magnesium fertilizer for all crops as basic fertilizer and meliorant
AgroMag — conditioning additive (anti-caking agent) for use in the manufacture of ammonium nitrate and NPK
MagTreat — solution for water treatment and flue gas desulphurization
FluMag — highly efficient metallurgical magnesia based flux brucite Kuldur deposit
MagPro — used as a reagent for the vulcanization of rubber in the manufacture of rubber products
BleachMag — highly efficient new generation product for the production of cellulose and semi-high output
MagAdd — ideal raw material for the production of a wide range of magnesium compounds and products based on the best varieties of brucite
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- Metallurgical flux