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MATERIALS.

Mold insulating material

GlasTherm is a thermal insulation material, developed to be an excellent medium for holding in the heat in molds. It is a fiberglass reinforced, mineral-filled sheet bonded together with heat resistant thermosetting resins. The material does not contain any asbestos fibers. Two grades of GlasTherm are grade S, a general purpose sheet where continuous operating temperature does not exceed 425 [degrees]; and grade HT which has superior heat resistance for applications with continuous use temperatures up to 550 [degrees]. GlasTherm is designed with high compression strength properties of 45,000 psi (grade S) and 49,000 psi (grade HT) versus 14,000 psi for asbestos concrete and 2,350 psi for calcium silicate. (Dielectric, W141 N9250 Fountain Blvd., Menomonee Falls, WI 53051-1648)

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Polyacrylate rubbers

Four new polyacrylate robber grades have been added to the Acron AR line. Based on carboxyl cure site technology, the Acron AR-500 series polymers are said to offer excellent heat and oil resistance, as well as outstanding high temperature compression set, according to the company. The products are said to be ideally suited for demanding automotive applications, such as seals, gaskets, o-rings and hoses. Two of the new grades are low Mooney viscosity for improved processing. (Cancarb, P.O. Box 310, 1702 Brier Park Crescent N.W., Medicine Hat, Alberta, Canada T1A 7G1)

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Internal lubricant

MoldWiz INT-40DHT is an internal lubricant/processing aid which is specially tailored for PES and other engineering resins processed at high temperatures (500-700 [degrees] F). The additive is said to improve release of parts from mold cavities, increasing melt flow and enhancing dispersion, as well. In fact, in recent customer evaluations, INT-40DHT was compared with a number of other similar processing additives and was selected as the best product for dispersing titanium dioxide, according to the manufacturer. MoldWiz INT-40DHT is incorporated directly into the resin, eliminating the need for an external release agent. It is available in 100% active powder or pellet form. (Axel Plastics Research Laboratories, 5820 Broadway, Woodside, NY 11377)

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Antistick coatings

Water-based antistick coatings are said to be thermally stable, chemically inert, environmentally and operator friendly. The products were developed for uncured and cured rubber compounds and parts. They were developed for processing applications in the manufacturing of tires, belting, hose and molded parts. They can be used as antistick coatings for slugs, pellets, calender goods, profiles and extruded parts. The company's products are said to provide a clear, colorless, dry film coating that will not contaminate the rubber compound or interfere with processing equipment. They contain no silicone oil, powder, waxes or heavy metals. The company's water-based, antistick coatings are said to provide superior performance, improved processing, ease of application, reduced scrap rates, and are supplied as concentrates for economical usage. Products contain no hazardous ingredients and are suitable for use on medical, automotive, industrial, electrical, aerospace and food applications. (McLube Division, McGee Industries, 9 Crozerville Rd., P.O. Box 2425, Aston, PA 19014-0425)

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Polyurethane curative

The company offers MOCA TRL, a polyurethane curative which retains all the excellent properties of regular MOCA. Additionally, the residual orthochloroaniline (OCA) has been further reduced to a low 0.2-0.4%. MOCA TRL is a product of special processing, which when reacted with TDI prepolymer, will cast into a translucent product. The cost savings versus MDI + PPG prepolymer + diol curing will enable producers of translucent cast products (i.e., roller blade wheels) using TDI + MOCA TRL to compete more favorably and profitably, according to the company. (Rit-Chem, P.O. Box 435, Pleasantville, NY 10570-0435)

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Maximum release

The company's polymer release agent is said to provide maximum release performance. The Dexter Frekote R-150 water-based releasing interface is said to give molders of most rubber goods an exceptionally high number of releases between release agent applications. Dexter Frekote R-150 water-based releasing interface is a water-based microemulsion. When spray applied to a heated metal surface, the reactive resin crosslinks and physically bonds to the metal surface. Superior multiple release performance results from a high crosslink density and strong affinity for mold surfaces, according to the manufacturer. This product is said to provide a durable release surface which does not transfer to released parts. Dexter Frekote R-150 water-based releasing interface is recommended for applications where maximum multiple release performance is paramount, according to the company. The product is available in one gallon, five gallon, 55 gallon and 275 gallon tote quantities. The manufacturer is said to be a global specialty materials supplier with three operating segments, including specialty polymers and nonwovens. (Dexter, Polymer Systems, One Dexter Dr., Seabrook, NH 03874-4018)

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Mold release agents

Aqualift products are water-based, environmentally compatible mold release agents designed for application to ambient and hot metallic mold surfaces ([is greater than] 140 [degrees] F). They may be spray applied to ambient surfaces (with subsequent blow drying by compressed air) or simply wiped on utilizing a pure cotton cloth. When applied correctly, Aqualift will provide for multiple releases of many urethane elastomer systems, according to the company. Benefits of Aqualift are said to include the following: environmentally compatible, water-based formulation; non-flammable formulation; excellent release-ease; improved production throughput; improved part cosmetics; and lower scrap rates. Service is provided by direct sales engineers. (Franklynn Industries, 167 Commerce Blvd., Cincinnati, OH 45140)

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Two-part fluoroelastomer

A two-part sealant/caulk, viscous but self-leveling, is said to be suitable for horizontal applications. Formulated from DuPont Dow Elastomers' Viton fluoroelastomer, Pelseal 2112 is said to exhibit exceptional performance characteristics in those industrial applications where resistance to an aggressive environment is crucial. Like other fluoroelastomers from the company, Pelseal 2112 is said to withstand temperature extremes of -40 [degrees] to +400 [degrees] F; resists attack by many chemicals and corrosive liquids, including gasoline, oil, hydraulic fluids, hydrocarbon solvents and sulfuric acid. Pelseal 2112 is also said to be resistant to ozone, UV radiation, salt spray and fungal growth. Because of these characteristics, Pelseal 2112 has been used effectively for hazardous material abatement, for example to seal cracks in concrete secondary containment areas subjected to harsh chemicals, such as sulfuric acid, according to the manufacturer. (Pelseal Technologies, LLC, 401 Lafayette St., Newtown, PA 18940-0309)

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External mold release

EM-1212SF2 is an environmentally friendly, water-based external mold release developed to replace solvent-based releases in tough, SMC/BMC and other highly filled resin molding applications. The non-flammable product is an emulsion which contains fluoropolymers, phosphate esters and fatty acids, and is enriched with a small percentage of alcohol to speed drying. The fluoropolymers are said to provide excellent heat resistance with minimal transfer of the mold release to the final product. Multiple releases from a single application can contribute to reduced manufacturing costs and enhanced mold maintenance, according to the company. The small fraction of alcohol is said to provide a quick-drying formula which is also non-flammable. And the overall composition is said to be much more environmentally friendly than solvent-based external mold releases, making it easier and more pleasant for employees to work with, according to the manufacturer. Spray-ing is the preferred method of applying EM-1212SF2 because it results in a more consistent release film. But it may be applied by wiping the product on the hot or cold molds. (Axel Plastics Research Laboratories, 5820 Broadway, Woodside, NY 11377)

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Rubber lubricants

The company has developed a water-based rubber lubricant. The products are said to provide a durable dry colorless film coating that will adhere tenaciously to a surface. It has proven to provide excellent lubricity, a low coefficient of friction and superior slip/stick properties, according to the manufacturer. The product can be used as an assembly lubricant, insertion lubricant and as a coating on cured and uncured parts and extrusions. The product is said to be environmentally and operator friendly, containing no VOCs, CFCs, HCFCs or solvents of any kind. The lubricant is thermally stable and chemically inert. The product will provide lubricity and antistick properties in one product. Being a dry film coating, the water-based lubricants will not attract dirt and dust like wet, oily or greasy lubricants. The product is currently being used in the automotive, aerospace, electrical, industrial and medical industries. (McLube Division, McGee Industries, 9 Crozerville Rd., P.O. Box 2425, Aston, PA 19014-0425)

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High performance rubber

Kraton polymers represent a range of high performance rubber materials that are said to improve the grip and shock absorbency of bicycle grabhandle grips. Kraton polymers are said to help give the grips both strength and softness where the rider's fingers grip the bar, providing comfort, a better hold and improved overall control, even on steep or rough terrain, according to the manufacturer. These soft qualities are said to cushion hands against vibrations caused by hard ground to give a more comfortable ride. High temperature performance and moisture resistance are said to mean that a Kraton polymers-based grip can help the rider keep a firm hold, no matter how hot and sweaty their hands. (Shell Chemicals, PO. Box 2463, Houston, TX 77252)

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Precipitated silica

The company's precipitated silica is said to allow robber manufacturers to improve the overall performance of their robber products easily and cost-effectively. The highly dispersible silica Ultrasil 7000 GR is said to save up to 60% of compounding time compared to standard silica, resulting in doubling the capacity of existing mixers. This saves costs and improves quality of robber products, according to the company. Comprised of an agglomerate structure, Ultrasil 7000 GR is said to be more conductive to dispersion in robber compounds than other commercially available silica products. Polymers penetrate the pore cavities of Ultrasil 7000 GR precipitated silica with exceptional efficiency, resulting in improved deagglomeration and dispersion by mechanical forces, according to the company. The Ultrasil 7000 granulate is 97% dispersible, said to be in stark contrast to standard precipitated silica granulates with typically poorer dispersion capabilities below 80%. Tire makers, consequently, are said to gain performance improvements by evenly distributing Ultrasil 7000 GR silica throughout the tire tread. (Degussa-Huls, 65 Challenger Rd., Ridgefield Park, NJ 07660)

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Oxidation-resistant fluid

OR (oxidation resistant) heat transfer fluid is said to be a non-fouling, non-toxic heat transfer fluid providing the highest thermal efficiency (600 [degrees] F) of any natural hydrocarbon fluid available today, according to the manufacturer. It can be used to control process temperatures to within [+ or -] 1 [degrees] F. Applications include chemicals, plastics, robber, die casting and many other industries. The federal government has certified OR fluid as food grade. Used fluid is said to be easily recycled. High-efficiency OR fluid is said to be specially formulated for use in closed-loop thermal oil systems where heat transfer fluids are more than occasionally exposed to air. OR fluid is said to exhibit very low viscosity. It is said to promote power savings by enabling the use of a smaller-capacity pump and motor. (Paratherm, 1050 Colwell Rd., Conshohocken, PA 19428)

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Mold lubricants

KantStik 91WX is a release agent for rubber molding that is said to use the latest dry film technology for lubrication of molds. This product has been formulated with a polymeric base material which can withstand high-temperature molding conditions well over 450 [degrees] F, according to the company. KantStik 91WX is water-based, nonflammable and safe to use, providing a better working environment, according to the manufacturer. KantStik 91WX was specifically designed for the molding of robber items (natural robber, EPDM, Viton, polyacetate) without the use of silicone-based products, providing extra slip and excellent releasing qualities, according to the company. KantStik 91WX is said to ensure reproducibility of intricate mold configurations while maintaining a clean mold surface. (Specialty Products, 75 Montgomery St., P O. Box 306, Jersey City, NJ 07303-0306)

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Thermoplastic elastomers

Elastomer product grades have been developed that are said to possess a broader temperature range than any olefinic TPE currently on the market. The Santoprene 7000 robber grades are said to exhibit extreme low-temperature performance at temperatures as low as -80 [degrees] C, and favorable compression recovery in dynamic applications at temperatures as low as -40 [degrees] C. The grades possess the lowest glass transition temperature of any olefinic TPE available, as low as -88 [degrees] C, and can withstand long-term exposure to temperatures up to 135 [degrees] C, according to the company. Additionally, these Santoprene grades are said to exhibit low specific gravity, low coefficient of friction and low compression set, as well as excellent abrasion and grease resistance. These physical properties combined make the TPE product line beneficial for applications in the automotive, construction and industrial markets, according to the company. The TPEs are available in hardnesses ranging from 60 Shore A to 40 Shore D. These Santoprene grades are said to offer cost-effective, high-performance alternatives to polychloroprene, EPDM, copolyester and polyurethane for applications requiring elastic properties at extreme temperatures. To make the low-temperature performance and other properties a reality, the company has developed a patented technology that is said to significantly depress the glass transition temperature of the material. (Advanced Elastomer Systems, L.P., 388 S. Main St., Akron, OH 44311 - 1059)

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Polymer colorants

Customers using Carilon polymers, Shell Chemicals' family of aliphatic polyketones, can now get a palette of standard colors for developing custom color matches for applications throughout the world. Carilon polymers are said to be known for their high performance in applications requiring chemical resistance and durability. The colorant processing does not alter the mechanical characteristics and flow properties of Carrion polymers. Carilon polymers are available in extrusion grades and a variety of injection molding grades. (Clariant Masterbatches Division, 1515 Miller Pkwy., McHenry, IL 60050)

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Mold releases

DiamondKote products are said to be water-based, environmentally compatible, solvent-free mold releases designed for applications to ambient and hot metallic mold surfaces. They may be spray applied to ambient surfaces (with subsequent blow-drying by compressed air) or simply wiped on utilizing a pure cotton cloth. When applied correctly, DiamondKote will provide for multiple releases for many elastomeric compounds with the possible exception of silicone rubbers. Benefits of DiamondKote are said to include the following: environmentally compatible, water-based formulation; non-flammable formulation; multiple releases per application; excellent release-ease; non-transferring formulation; excellent for rubber to metal bond applications; improved part cosmetics; lower scrap rates; and quick curing. (Franklynn Industries, 167 Commerce Blvd., Cincinnati, OH 45140)

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Internal release

MoldWiz INT-PUL24 additives are said to improve pultrusion processing, optimizing line speed by reducing pull force, while contributing to minimum die wear. INT-PUL24 is said to yield more consistent, cleaner profiles, yet waste is said to be reduced. Unlike many commodity lubricants, INT-PUL24 will not interfere with bonding or other secondary processes, according to the manufacturer. The polymeric liquid additive has a pH of 4.5, which is said to make it much less likely to corrode die surfaces, while maintaining excellent processing values. (Axel Plastics Research Laboratories, 5820 Broadway, Woodside, NY 11377)

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Polyurethanes

Baydur 645 polyurethane structural foam is used in slalom skis manufactured by Connelly Skis. The Baydur polyurethane material forms the core of the ski. Baydur polyurethane foam systems are two-component MDI-based liquid systems that are said to offer excellent surface quality, along with stiffness and large-part moldability. (Bayer, 100 Bayer Rd., Pittsburgh, PA 15205-9741)

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Accelerator replacement

Benzyl Tuex thiuram accelerator is offered as an alternative to other thiuram-based accelerators such as tetramethylthiuram monosulfide, tetramethylthiuram disulfide and tetraethylthiuram disulfide. Technical data are said to show that there are no specific health hazards associated with the handling of Benzyl Tuex accelerator, and no nitrosamines are detected during processing. The accelerator is said to feature a faster cure rate without sacrificing scorch safety. (CK Witco, Benson Rd., Middlebury, CT)

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Water-based mold release

Water-based mold release coatings are offered for all types of synthetic, natural and silicone rubber compounds and parts. They are said to be environmentally and operator friendly, thermally stable, chemically inert products that offer durability, improved mold flow and superior release with no transfer to the molded parts, according to the company. They can be applied to both hot and ambient mold surfaces. (McLube Division, McGee Industries, 9 Crozerville Rd., P.O. Box 2425, Aston, PA 19014-0425)

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Semi-permanent release

Xtend W-7200 release is said to yield a semi-permanent aqueous emulsion external release agent which forms a uniform cured film on drying. This selective adhesion on the mold surface prevents the film from being tom or ripped off by the de-molded part. In a study, a manufacturer centrifugally casts a highly filled polyester resin to produce 4" to 8" diameter piping for various infrastructure applications. The resin mix containing 33% resin, 67% calcium carbonate with 25% glass fiber is cast in multi-position, carousel type steel mold and processed at 240 [degrees] F/115 [degrees] C for 20 minutes. Xtend W-7200 was evaluated against two competitive semi-permanent mold releases. Neither of the competitors were capable of providing multiple release, according to the study. Xtend W7200 provided five easy releases and was judged capable of providing more, according to the manufacturer. Xtend W-7200 is a water-based release. (Axel Plastics Research Laboratories, 5820 Broadway, Woodside, NY 11377)

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Polyol additives

A polyol has been developed to make solid polyurethane elastomers virtually impervious to wet or humid environments. The manufacturer reports that this hydrophobic polyol improves the water resistance of polyurethane elastomers, making them suitable for a variety of applications including electrical encapsulants. Multranol 8224 polyol can be used with a variety of polyisocyanates to produce elastomers in the 35 to 75 Shore D hardness range. Multranol 8224 produces polyurethane elastomers exhibiting five to ten times lower water absorption than conventional polyether-based polyurethanes, superior resistance to chlorinated water and excellent resistance to hydrolysis at high temperatures and humidity, according to the manufacturer. (Bayer, 100 Bayer Rd., Pittsburgh, PA 15205-9741)

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Polyoctenamer modifier

A patent has been granted for Vestenamer polyoctenamer reactive modifier for ground-tire-rubber/asphalt concrete road surfacing mixtures. A small amount of the product binds the mixture and eliminates tack for lower cost-per-mile, superior road surfaces, according to the manufacturer. The key advantage of the tack-free mixture is said to be that it cuts out the costly wait for cooling. This permits the rolling of the pavement immediately after application, because the hot surface will not stick to the machinery. In addition to speeding up the paving process, Vestenamer polyoctenamer is said to impart surface properties that repel water and ensure less icing. Vestenamer pellets are added at 0.05 to 0.1 percent by weight of the surfacing mixture. Relative to the GTR, the pellets are added at 3% to 6% by weight, depending on the surface area size, as well as the texture of GTR particles. As an example, a 20-mesh GTR particle has more surface area if ambiently ground than if it were cryogenically ground. The pellets are added to the crumb rubber, or just before the crumb rubber. The polyoctenamer chemically crosslinks the crumb rubber with the asphalt. Crumb robber alone is a non-reactive additive to asphalt. Vestenamer polyoctenamer reacts chemically with both the crumb rubber and the asphalt to produce a uniform, low-tack, rubber-like composite, according to the company. (Creanova, 220 Davidson Ave., Somerset, NJ 08873)

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Semi-permanent release

Two semi-permanent, water-based release coatings have been developed for synthetic, natural and silicone rubber parts and materials. They are designed to provide maximum releases per application with no transfer or mold buildup, according to the company. The semi-permanent, water-based mold release coatings are designed for the injection, transfer and compression molding of rubber parts. They have also found applications in the manufacturing of tires, hose and belting. They have proven to be extremely effective with peroxide cured compounds, high filler content and other difficult to process compounds, according to the company. They can be used with FKM, HNBR, polyacrylate, CPE, butyl, polybutadiene, natural, polychloroprene and ECO, as well as silicone rubber. The products are said to be user and environmentally compatible. Product attributes are said to include durability, improved flow properties, elimination of flow, knit lines and voids, increased productivity and reduced scrap rates. (McLube Division, McGee Industries, 9 Crozerville Rd., PO. Box 2425, Aston, PA 19014-0425)

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UV curable sealant

Eclipse 901 is a single component UV curable sealant designed to produce cure-in-place gaskets. Eclipse 901 is a liquid that cures to form a high strength elastomer when exposed to UV-A light. It can produce gaskets up to a thickness of 150 mils. Uncured Eclipse 901 is easy to handle and use at room temperature, according to the company. (Elementis Performance Polymers, P.O. Box 700, Hightstown, NJ 08520)

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TPE compounds

This manufacturer and distributor of custom formulated thermoplastic elastomer compounds for various industries offers several new grades in its lines of Dynaflex TPEs and Versaflex TPE alloys which are suitable for multishot and over-molding applications. The Dynaflex TPE compounds have been found to bond well with polypropylene substrates, while the Versaflex TPE alloys are suitable for overmolding onto poly-carbonate, ABS, nylon, polypropylene, copolyester and propionate materials. Among the applications for the overmolding TPEs are consumer and industrial products such as toothbrushes, cameras, pens, razors, sporting goods, hand/ power tools, appliances and kitchen utensils, or any product which could benefit from a soft-touch, tactile feel or grip, according to the company. (GLS, 833 Ridgeview Dr., McHenry, IL 60050-7050)

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Polymeric plasticizer

Trilene 77 plasticizer is a solid form polymeric plasticizer that is said to offer processors easy handling at room temperature, allowing them to cut and weigh it without it sticking to surfaces. This benefit is said to improve processing operations for mixing, extrusion, calendering and molding. Handling techniques for Trilene plasticizer are similar to those for other waxy solids in the rubber industry. The polymer changes to a moderate-to-low viscosity liquid (at temperatures above 45-50 [degrees] C), due to melting of its ethylene crystallinity. In addition, unlike a conventional, non-reactive paraffinic oil, Trilene 77 plasticizer has minimal effects on cure rate and cured physical properties, including hardness and aging, according to the manufacturer. Typical applications include wire and cable, seals, robber auto parts and accessories. Since Trilene 77 polymeric plasticizer is a high-ethylene synthetic rubber (EPDM) with low molecular weight, it is said to be useful as a non-extractable and non-volatile reactive plasticizer in EPDM and other specialty rubber compounds. The polymeric plasticizer is said to enhance the surface appearance of extrusion compounds, while providing an improved balance of static ozone resistance and physical properties in general purpose rubber blends that incorporate Royalene EPDM and Naugard Q antioxidant. (CK Witco, Benson Rd., Middlebury, CT)

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Silicone compound

A reformulated liquid silicone rubber compound is said to be bringing improved heat resistance, faster cure and better mold release to injection molding operations. Customer trials have produced excellent results, showing physical property gains in tensile strength, elongation and compression set resistance, according to the company. Testing and prototype runs are said to have prompted several molders in the U.S. and Europe to specify the material over existing silicone formulations. Silastic 9280-70 liquid silicone robber cures to form a 70 durometer elastomer in about five minutes at 150 [degrees] C. The formulations are said to offer processing advantages. (Dow Coming, Midland, MI 48686-0994)

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No portion of this article can be reproduced without the express written permission from the copyright holder.
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Publication:Rubber World
Article Type:Statistical Data Included
Geographic Code:1USA
Date:Dec 22, 1999
Words:3932
Previous Article:EQUIPMENT.
Next Article:INSTRUMENTS.
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