Polyester mortars

Maximum chemical resistance of polyester mortars is obtained from cements made from isophthalic or biphenol resins. The biphenolic resins are preferred for alkaline and hypochlorite solutions. 

Several years ago one company had considerable success with a carefully formulated polyester mortar topping specifically designed to minimize these stresses, but found that, unless it was laid with meticulous care, failures could occur. 

This process can achieve a recovery of scrap foam into a polyol mixture, which can be used to produce polyurethane without the need for purification. This method requires low capital investment and is simple enough to cope with variations in the mix scrap foam. The resulting recycled polyol can be incorporated with polyisocyanate to produce recycled polyurethane which can be used to modify recycled polyester mortar made with either virgin or recycled resins. 

Typical Properties of Recycled P Polyurethane Modified Recycled cycled Polyester Mortar... 

VIA.IOR PRODUCT APPLICATIONS concrete modification, composite, building materials, polyester mortar... 

Unlike the polyurethanes and other previously discussed mortars, polyester cements are produced by a free radical chain copolymerization of a liquid unsaturated polyester and styrene. While most polyester composites are reinforced by fiber glass, polyester mortars are usually filled with silica, clay or alumina trihydrate (ATH). 

The characteristic brittleness of unsaturated polyester resins was overcome by reinforcement with silane-treated fiber glass. While over 750 thousand tons of these reinforced plastics are produced annually in the U.S., the emphasis in this chapter will be on room temperature-curable-filled unsaturated polyester mortars or concrete. As discussed in Chapters 1 and 7, these anaerobic polyester mortars are widely used as materials of construction.—... 

As described in Chapter 1, the original silica-filled unsaturated polyester mortar, called Vitroplast is used as a grouting composition for joining bricks for filling cracks, as a monolithic floor or wall coating, and as a casting composition for articles, such as drain pipes and bathroom fixtures. 

The water resistance of "cultural marble" produced from clay or calcium carbonate-filled polyester mortars has been improved by treating the filler with a silane, such as gamma-methacryloylpropyltrlethoxysilane.22 The translucency of "cultured marble" may be improved by the use of ATH as a filler. 

Spode, which Is a well known manufacturer of chlnaware. Is now producing its plates, cups, and saucers In molds cast from polyester mortar.Polyester cements are also being used as roofing compositions and a mixture of polyester resin and Portland cement called Estercrete is being used to surface... 

While relatively large objects may be cast In molds from polyester mortars, molds are not always essential. For example, a reproducton of the 20 m long John Paul Jones first ship, the Providence, was fabricated by applying a polyester mortar to fiber glass-reinforced polyester planking. 

Polyester mortars are used in oxidizing services such as nitric and chromic acid. They are, however, more expensive than furan and also exhibit a narrower range of chemical resistance. They are usually a three-component system consisting of a resin, a powder, and a curing agent. 

The polyester mortars were originally developed to resist chlorine dioxide. There are a number of types of polyester resins available. The ones most commonly used are the isophthalic, chlorendic, and Bisphenol A fumurate. Depending on the application, the polyester mortars can be formulated to incorporate carbon and silica fillers. One hundred percent carbon fillers are used to resist hydrofiuoric acid, fiuorine chemicals, and strong alkalies such as sodium and potassium hydroxide. The chlorendic and Bisphenol A fumurate resins have improved chemi-... 

Table 7.12 Comparison of Corrosion Resistanoe of Polyester Mortars... 

Polyester Mortar probably resistant to boiling point in all three concentrations. Epoxy toppings may be considered up to 10% but verify by test. 

STERNCHEM Polyester Mortar is formulated to provide superior service for acid brick constructions in the chemical process, pulp and paper, plating, textile, fertilizer, and metal refining industries. They are especially suited for chlorine dioxide towers, bleaching vats, trenches, sumps, pits, bleaching solutions of sodium hypochlorite, oxidizing solutions of nitric and chromic acids to 20% concentrations, hydrobromic acid, potassium and sodium dichromates, bromine water, salt solutions to pH 11. 

Figure 2. Shrinkage - Epoxide Mortar Figure 3- Shrinkage - Polyester Mortar...

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