Polyurethane Adhesive Sealants

R. P. Deltieure, "Polyurethane Adhesives and Sealants," Proceedings of Caulks and Sealants Short Course II, The Adhesive and Sealant Council, Rosemont, hi., 1992. 

Propylene oxide is produced from the chlorohydrination of propene similar to the process used to make ethylene oxide (see Ethene). A major use of propylene oxide involves hydrating propylene oxide to produces propylene glycol, propylene polyglycols, and other polyether polyols. These products are used to produce both rigid and flexible polyurethane foams, but they are also used to produce polyurethane elastomers, sealants, and adhesives. 

It is mainly used in the industrial production of rigid polyurethane foams. Many other uses are in the fields of coatings, adhesives, sealants and elastomers such as paints, adhesives, weather-resistant sealing materials and foohvear. There is use also in the production of particle board (bonding of wood) and mould cores for the foundry industry (European Union, 1999). 

Epoxy and polyurethane adhesives are not appreciably affected by 10-9 torr for 7 days at room temperature. However polyurethane adhesives can exhibit significant outgassing when aged under 10-9 torr at 107°C.75 At room temperature a high vacuum does not generally cause significant weight loss in commercial adhesive and sealant materials. 

Performance plastics Adhesives, sealants, and coatings Engineering plastics Epoxy products and intermediates Fabricated products Polyurethanes 28... 

Di- and poly-isocyanates are mainly used in the production of polyurethane rigid or flexible foams (for insulation and in furniture), adhesives, sealants, surface coatings, elastomers and fibres [2007,2072,2165], whilst mono-isocyanates are employed in the synthesis of substituted ureas and carbamates (Section 4.7.3) for medicinal, agricultural and other... 

Polyurethane products and formulated systems are used in rigid foams, flexible foams, adhesives, sealants, coatings and elastomers, as well as in many other applications. Propene glycols are used in a wide variety of end-use and industrial applications, from unsaturated polyester resins, cosmetics and household detergents, to paints and automotive brake fluids. Propene glycol ethers are commonly... 

In 1999 the Dow Chemical Company had a turnover of US 18900 million and employed 39000 people within 14 business units at 123 manufacturing sites in 32 countries. A map showing the location of the sites is included in the CER. The head office is at Midland, USA. The products made and services offered are reported in the annual report under six main headings Performance Plastics adhesives, sealants and coatings enginering plastics epoxy products fabricated products and polyurethanes ... 

Polybutadiene diols and hydrogenated polybutadiene diols are used for producing thermoplastic polyurethane elastomers, hydrolytically stable PU elastomers, adhesives, sealants, coatings, encapsulation and electrical insulation polyurethanic products. 

Amkure . (Air Prods.] Atnine-based catalyst for coatings, adhesives, sealants crosslinker for polyurethane coatings accelerator. 

Luphen . [BASF AG] Polyurethane or polyester derivs. for prod, cf prepolymers, adhesives, sealants, coating compds. 

Apart from underbody coating (usually PVC based), which is not explained further, the majority of bonding and sealing products in the paint shop are also PVC compounds. Acrylate plastisols are not often used and polyurethane-based sealants are rarely found. The main applications are in seam sealing and antiflutter bonding. On a small scale there are adhesive applications to bond and seal caps and to fix sound deadeners. In addition, foams and butyls as well as bituminous or acrylic-based sealants are used to fill car body holes. 

Chem. Descrip. Waterborne aromatic polyester polyurethane polymer Uses Urethane for specialty coatings, adhesives, sealants Features Heat reactivatible exc. adhesion to many substrates Properties Opaque dens. 8.8 Ib/gal vise. 1500 cps pH 8.5 tens. str. 4550 psi elong. 550% (break) hardness (Sward) 27 VOC 306 g/l 35% solids 11.3% NMP Sancure 2019 [Noveon]... 

Uses PU curing agent producing high-performance R.T. cast and cured elastomers, cast prototypes and elastomers, coatings, adhesives, sealants, and spray systems epoxy flexibilizer Features Eor use with TDI or MDI prepolymers Properties Liq. equiv. wt. 225 Versalink P-650 [Air Prods./Polyurethanes]... 

Hazardous Decomp. Prods. CO2, CO, cyanides, nitrogen oxides Uses Mixts. with 2,4-TDI to mfg. flexible polyurethane foams (for furniture and bedding industry) and rigid polyurethane foams (insulation) mfg. of elastomers, coatings such as polyurethane paints, varnishes, wire enamels, adhesives, sealants in food-pkg. adhesives Regulatay FDA 21CFR 175.105 ManufJDistrib. Bayer/Polymers Trade Names Containing Rubinate TDI 80/20... 

Hazardous Decomp. Prods. Heated to decomp., emits highly toxic fumes of NOx NFPA Health 3, Flammability 1, Reactivity 1 Uses In mfg. of polyurethane foams, elastomers, coatings, adhesives, sealants crosslinking agent for nylon 6 solvent in food-pkg. adhesives... 

Addition of plasticizer to polyurethanes can be done in several ways in the beginning of synthesis of prepolymer, at the last stages of synthesis, and during adhesive/sealant... 

The use of adhesives/sealants in both the industrial and consumer spheres has increased dramatically in the past 20 years. In the industrial segment, both reactive and nonreactive systems are used in a wide variety of applications. The increasing use of reactive systems has, however, tended to overshadow that of the nonreactive systems. Most prominent amongst the reactive systems favored in industrial applications are anaerobic sealants (methacrylate ester based), instant adhesives (alkyl cyanoacrylate ester based), acrylic (toughened) adhesives, epoxy resin adhesives, polyurethane/isocyanate-based adhesives, silicone adhesives/sealants, and phenolic resin adhesives. 

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