Microsoft word - dion 382e.doc

April 2004
DION® 382E
Powdered Bisphenol-A Fumarate Resin


DION 382E is a powdered, monomer-free, bisphenol-A fumarate polyester.
• DION 382E is typically used as a styrene soluble binder for fiberglass reinforcement products.
• High tensile properties of chopped strand mat. solvents, crosslinking monomer, or external flow • Compatibility and good solution rate properties with styrene, leading to good appearance, workability, and air release • Soluble in styrene and most organic solvents. • No use of solvents or water which present • Welds together adjacent glass filaments • Uncrosslinked, behaves as an amorphous low without wicking or icing associated with melting point thermoplastic before curing. thereby leading to minimal binder usage to • Laminates made from styrenated versions feature • High molecular weight, coupled with melting production of thermoformable mat with good properties. • Manufactured using statistical process control in • Consistent batch-to-batch performance. PROPERTIES
Acid Number .16 maximum Ring & Ball Softening Point, oC . 96 - 106 Mesh Size: % on U.S. #35.0.5 max % thru U.S. #100.30.0 max % thru U.S. #200.10.0 max Average particle size, microns . 220 - 240 Viscosity @ 25 oC, 50% in styrene, poise . 45 Bulk density, lb/cu. ft. . 35 Melt index, 2,160 gm, gm/10 min.: @ 115 oC. 7 - 14 Tg, by DSC, midpoint, 10 oC/min ramp, oC: first heat . 63 second heat . 56 Melt viscosity, poise: @ 150 oC. 180 @ 170 oC. 40 APPLICATION PROPERTIES
DION® 382E is widely used as a binder for chopped strand mat where good transparency or compatibility is desired for various reinforced plastics. Upon dissolution in styrene it will co-react with polyester laminating resins. The chemical structure of DION 382E affords excellent corrosion resistance and the mat products are universally suitable for premium as well as general purpose resin applications. An outstanding property of DION 382E is that high mat tensile strengths are possible, while still affording a binder which dissolves styrene at a rate sufficient to permit good appearance, de-aeration, and workability during laminate construction. The binding strength is made possible by the high molecular weight and structure of DION 382E. Apart from chemical composition, binding efficiency is affected by particle size distribution, and alternate particle size versions can be offered. The choice of particle size depends on the weight of the glass mat produced, on the tex of the glass strand, and the effectiveness of mechanical distribution. Generally, lighter mats require finer particle size versions. Particle size distribution of DION 382E is carefully controlled once the proper distribution is specified. Excessively large, particles do not detract from binding strength, but result in wasted material. Likewise, too small particles, can afford insufficient mass to bridge and weld together adjacent glass filaments. Moreover, small particles may preferentially fall through the mat before they are fused. DION 382E particles are irregularly shaped so they have a tendency to cling to the mat before fusion. Processes for applying and fusing the binder vary widely. Typical usage is 2.5 - 4% by weight of the glass mat, depending on the desired degree of rigidity. Competitive solvent or water based emulsions tend to require more usage on a solids basis, because much of the binder tends to coat individual filaments without affording a weld to adjacent filaments. Moreover, the dry application system afforded by DION 382E greatly reduces energy requirements and eliminates many environmental problems. Stoving conditions will vary, but typically involve about 1.5 minutes at 160 - 220 oC, depending on the furnace and mat thickness. The operation is designed to melt the binder to weld together the fibers at contact points. Overheating must be avoided to prevent the binder from homopolymerizing (yielding a stiff mat) to prevent discoloration. Generally, each operation must be individually optimized in accordance with heat transfer to the mat to assure the binder is optimally fluidized without overheating.
Because of its high molecular weight and melting characteristics, DION® 382E is finding growing use in various preform applications involved in RTM and SRIM. Preforms made from DION 382E can exhibit good shape retention without the need for crosslinking or curing agents which yield stiffness which can be hard on mold surfaces. Furthermore, DION 382E can afford shorter thermoforming cycles and lower temperatures to minimize discoloration problems with glass sizings. Since DION 382E represents a dry system, the need for evaporation of carrier fluids is avoided. This is especially advantageous in thick, multi-ply preforms since fiberglass is a good thermal insulator. The absence of water is an extra advantage whenever the preform is intended for urethane applications. Furthermore, preforms made from DION 382E tend to be relatively resilient, which accelerates the cooling rate by allowing air to enter the preform whenever pressure is relaxed after the mat is thermoformed. DION 382E may be limited in practicality for preform applications involving intricate shapes or where high fluid velocities are involved during RTM or SRIM injection. Individual testing is required, and Reichhold should be consulted on the possible supply of specialized versions of the binder. DION 382E is chemically quite stable, but should be stored under cool, dry conditions, away from heat. Temperature must never exceed 100oF to minimize chances of fusion or agglomeration of the particles. Like most solid powders the material can compact slightly upon excessive handling or vibration. During summer months, it is recommended that air conditioned or refrigerated transport be considered to minimize chances of overheating upon shipment. DION 382E is not hygroscopic, but elevated humidity has a slight tendency to form weakly bound lumps. These lumps are easily broken, but storage under low humidity is always advantageous. PACKAGING FORM
DION 382E is normally supplied in 250 lb. net fibre drums or 1000 lb. net gaylord boxes. Both containers are equipped with polyethylene liners. READ AND UNDERSTAND THE MATERIAL SAFETY DATA SHEET BEFORE WORKING WITH THIS PRODUCT
Obtain a copy of the material safety data sheet on this product prior to use. Material safety data sheets are available from your Reichhold sales representative. Such information should be requested from suppliers of all products and understood prior to working with their materials.


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