Hycar resins

Example 3. Hycar Resins pic is considering the introduction of a new resin. Fixed plant capital of 10 million will be spent this year for a plant to produce 3000 tonnes/year of product. Working capital at full output would be 300 000 and would be spent as sales build up. Variable cost of production is 300/tonne and fixed costs of 100000/year. A ten-year production life is expected and net scrap value will be nil. Depreciation allowance and tax on net revenue inflow are 52% paid one year in arrears. 

Formulation 100 phr Hycar OR-25EP different amounts of phenolic resin 5 phr zinc oxide 1.5 phr sulphur 1.5 phr benzothiazol disulphide 1.5 phr stearic acid [68]. 

The epoxy-nitrile adhesives were introduced commercially in the late 1960s. They consisted primarily of DGEBA epoxy resin modified with carboxyl-terminated butadiene nitrile (CTBN) rubber. These first nitrile copolymers were available from B.F. Goodrich under the trade name of Hycar. The most convenient form of epoxy nitrile adhesive, especially when one is bonding large parts (aircraft structures), is a supported film. However, solvent solutions of epoxy-nitrile adhesives have also been commercially available. 

Hycar CTBN-Bisphenol A-Epon 828 Cast Samples. A standard recipe follows 100 parts DGEBA resins (Epon 828), 24 parts bisphenol A, five parts liquid rubber (CTBN), and five parts piperidene. It is often desirable to have a stock mixture of bisphenol A and Epon 828. Since the shelf stability of the mixture is poor at room temperature, it should be refrigerated. Melt the bisphenol A in Epon 828 with stirring... 

Effect of Bisphenol A Addition Two-Particle Size Systems. If we modify the Hycar CTBN-epoxy resin system so as to produce a two-particle size system, we can produce the toughest epoxy resins. We modified the CTBN-epoxy resin system by adding bisphenol A. A many-fold improvement in fracture energy is obtained when Hycar CTBN is used with bisphenol A and epoxy resin. The maximum improvement, when 5 phr Hycar CTBN is used, is at a bisphenol A concentration of 24 parts per hundred parts of epoxy resin. Typical data describing the properties of these systems are shown in Table VI. 

Rowe, E. H., Fractography of Thermoset Resins Toughened with Hycar... 

Figure 1. Lap-shear strength (top) and T-peel strength (bottom) of one-part epoxy adhesives (Adhesive A formulations). Key CRS, oily cold-rolled steel EGS, electrogalvanized steel CTy control (unmodified resin) T-Ay T-By and T-C refer to particle sizes of MEAc tougheners 5 to 45 pm (T-A)y 17.8 pm (T-B), and 2.3 pm (T-C) and L13y Hycar CTBN (1300x13).

The material used was a diglycidyl ether of bisphenol A (DGEBA) based epoxy resin (Ciba-Geigy, GY250) cured using stoichiometric amounts of 4,4 -diamin-odiphenyl sulfone (DDS). The rubber used for the modifications was Hycar car-boxy-teminated butadiene-acrylonitrile (CTBN) rubber (1300 x 13). The curing schedule for all the rubber-modified epoxy-DDS systems was as follows first the rubber and then DDS were mixed with the epoxy resin and stirred at 135 °C until the DDS was dissolved the systems were cured for 24 h at 120 °C and then postured for 4 h at 180 °C. The control epoxies were cured according to the same schedule. 

Hycar . [BFGoodrich BFGoodrichUK] Nitrile, ABS, acrylic latexes used for adhesives, carpet badxoatings, papa coatings and saturation, ingment binding, textile coatings, leather finishes, paints, resin modification. 

Polymethylacrylate (PMA) and polymethylmethacrylate (PMMA) were discovered, respectively, in 1880 and 1930. The resins have been used for the production of transparent plastic sheets, viz. Plexiglas or Perspex , used for the military aircraft cockpit canopies, gunner s turrets and the like [Riddle, 1954]. Acrylic elastomers (ACM or ANM) were developed by Rohm in 1901, and commercialized in 1948 as Hycar vulcanizable copolymers of ethyl acrylate, allyl maleated lactones, chloroethyl vinyl ether, butadiene, isoprene, acrylonitrile, etc. [Mast et al., 1944]. Since the 1950 s, a wide variety of acrylic compatibilizers and impact modifiers have been developed. 

BF Goodrich Chemical Group, "Toughen Epoxy Resins with Hycar Reactive Liquid Polymers" 1980, RLP-2. 

Of the synthetic resins that are found in pyrotechnic formulas, we find vinyl derivatives such as polyvinyl acetate and chloride, the latter as a chlorine donor rather than as a binder rubbery resins such as polyacrylic resin Hycar 1052 x 3 in MEK solvent have been successfully incorporated in pellets. 

Hybrid safflower oil. See Hybrid safflower (Carthamus tinctorius) oil Hybridur 560 Hybridur 57a, Hybridur 580. See Urethane-acrylate resin Hy Brite 100 Siurry. See Aluminum hydroxide Hycar 1552, Hycar 1561, Hycai 1562, Hycar 1571, Hycar 1572, Hycar 1572X64. See Butadiene/acrylonitrile copolymer Hycar 1577, Hycar 1578X1. See Acrylonitrile/butadiene/styrene copolymer Hycar 2671, Hycar 2679, Hycar 26083, Hycar 26084, Hycai 26092, Hycar 26106, Hycar 2612a, Hycar 26138. See Acrylic resin... 

The good low-temperature properties of the flexibilized epoxy resin systems are due to the increased mobility of the segments from the main relaxation down to the y relaxation. Epoxy resin pol3nners modified with Empol(dimerized fatty acid) or Hycar (butadiene-acrylonitril copolymer, terminated by carboxyl groups) show notable strength, impact resistance, and temperature-shock resistance down to 20 Yet none of these systems is ductile... 

Various types of polymeric modifiers have been researched as possible candidates to impart impact resistance of epoxy resins. Sometimes, properties other than impact resistance are to be modified. For example, for adhesive applications, the main focus is usually on improving shear and peel strength. In these cases, epoxies blended with elastomeric nitrile rubbers (Hycar CTBN, B.F. Goodrich), phenolics, nylons (soluble types such as DuPont Zytel-61), and pol5nirethanes are commonly used. For impact modification, there are several approaches, as discussed below. 

Commercial applications of Hycar—epoxy resin systems were at one time predominantly, indeed almost exclusively, the domain of the structural adhesives industry. Adaptation of some of these systems and the associative epoxy technology surrounding carboxyl-terminated liquid rubber have produced a growing Hycar-epoxy alloy consumption in epoxy applications other than structural adhesives. 

Nowadays, beside Viton a number of non fluorinated binders are used in MT-based formulations. These materials include polyester resins, which are popular in France (MTR) [28], Styrene-butadiene copolymer (Hycar ) (MTH), which was... 

One of the largest areas of use of nitrile rubber modified epoxy systems is in the printed circuit board area. A number of systems have been described that are composed of carboxyl-containing nitrile rubber such as Hycar 1072 mixed with epoxy resin. " The low molecular weight functionally terminated nitrile rubbers have also found significant application in this area. Other workers have found useful a system that combines a high molecular weight nitrile rubber with the liquid functionally terminated materials. Finally, other references describe the use of non carboxylated nitrile rubbers in circuit board applications. 2 ... 

The early work of McGarry and coworkers revealed that brittle epoxy resins could be toughened by incorporating small amounts of CRLP. The most effective polymers are copolymers of acrylonitrile and butadiene (Hycar CTBN). The level of acrylonitrile can be varied from 0 to 28%. Also additional acid groups can be inserted into the polymer chain. Analysis of fractured surfaces reveal a two-phase system... 

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