Urethane binders

Air samples were collected in the moulding and pouring departments of a United States iron foundry using a phenolic urethane binder. The two-day average level of pyridine, emitted as a breakdown product of 4-phenylpropylpyridine used as a binder... 

Accelerated Aging and Characterization of a Plasticized Poly(ester urethane) Binder... 

Urethane binders and adhesives represented about 5 (120 million pounds) of total U.S. urethane use in 1979, Table 1. 

Figure 1. Effect of catalyst type on compressive strength build-up for urethane binders.

Sancure 850 urethane, binders Estane 5707 FI Estane 5715 urethane, biister board coatings... 

Curing of Synthetic Rocket Fuel with Urethane Binder... 

Urethane polymers are important in many fields other than home improvement and, in some of these cases, the ability to easily estimate the degree of cure can be very important. For example, in the manufacture of certain types of fuel for use in rockets, solid propellant is mixed with a urethane binder and very slowly cured in small batches. It is important for reasons of both safety and performance that the correct degree of curing is achieved. To illustrate the application of fiber optic mid-IR spectroscopy to this problem, a simulated rocket fuel mixture was obtained from an industrial partner. The material comprised a simulated propellant mixed with an uncured urethane precursor curing of this particular mixture is typically carried out batchwise at a temperature of 50°C over a period of several days. The use of a direct, in-situ probe capable of giving a clear indication of the state of cure of each batch would be of great utility. 

Figure 9. Mid-IR Spectra of Simulated Rocket Fuel with Urethane binder the bold trace was taken at the beginning of the curing period with subsequent spectra at 200 minute intervals.

Figure II. Graph of peak area ratio (1731 2250 cm-1) against time for curing of simulated rocket fuel with urethane binder.

Uses Intermediate in org. synthesis for end-prods. such as flame retardants, plasticizers, antifoaming agents, antioxidants, oil additives, EP lubricants acid inhibitor for urethane binders for foundry molds Features Hydrolyzes rapidly with water to form phenylphosphonic acid... 

Precaution Hydrolyzes on contact with water to form HCI and phenylphosphoric acid reacts with alcohols, phenols, amines mild dehydrating agent Storage Moisture-sensitive Uses Intermediate in selective mfg. of phosphoric acid diesters protective agent for hydroxyl groups pharmaceutical intermediate phosphorylating agent for alcohols, amines, and thiols acidic inhibitor for urethane binders for foundry molds... 

Polypropylene, biaxially oriented, 2-ply laminate, urethane binder... 

Synthetic leather products are also produced using a urethane binder. These poromeric materials are produced from textile-length fiber mats impregnated with DMF solutions of polyurethanes. Permeability to moisture vapor is the key property needed in synthetic leather. In addition to shoe applications, poromerics are... 

Zinc-rich coatings are subdivided as organic or inorganic. The organic zinc-rich coatings have organic binders such as polamide epoxies, chlorinated rubber binders, and urethane binders. 

CLSM is a powerful technique for characterising coating microstructure, as shown for 1102 pigments dispersed in an acrylic urethane binder, A1 flake pigments and pearlescent-pigmented coatings [116]. 

Cold-Box Process. In the cold-box process which takes place at room temperature, a gas catalyst is passed through the sand to promote curing. The catalysts are triethylamine or meth-ylethylamine for phenolic isocyanate binders, sulfur dioxide for vinyl-unsaturated urethane binders, and methyl formate for an alkali metal salt of a phenolic resole binder. Yii -ortho resins have been developed for the phenolic component by using water-free systems and salts of divalent metals as catalysts. A recent patent describes improvements in the two-package phe-... 

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