Adhesive dips

A sodium salts of resin acids 37.5 12.0 50 medium strength cured films having a slow crystallization rate adhesives, dipped goods, saturants, coatings, bonded batts... 

Materials. Two types of standard tire cord obtained from Gen Corporation were used in this investigation polyester, 1300/3, and nylon 66, 1260/3. The rubber composition to which the adhesively dipped cords were bonded had the following composition in parts by weight styrene-butadiene rubber (SBR) 1502, 100 N330 carbon black, 50 zinc oxide, 5 stearic acid, 0.5 sulfur, 1.7 2-morpholinothio-benzothiazole, 2. Master batches were mixed 7 min in a 350-ml Brabender Plasticorder, and curatives were added on a cool two-roll mill. Cure characteristics at 155 °C were determined with an oscillating disc rheometer (ASTM D 2084). The time to reach 90% of the final cure state was 23 min, and the Shore A hardness of the final vulcanizate was approximately 60. 

Four types of condensed tannins were studied in the adhesive dips 1) extracts from pecan nut pith obtained by digestion with aqueous sodium sulfite-sodium carbonate solutions, 2) purified tannins from southern pine bark, 3) extracts from southern pine bark obtained by digestion with aqueous sodium sulfite-sodium carbonate solutions, and 4) tannins extracted with acetone-water solutions from peanut skins. 

Figure 2. Pullout forces of polyester cords for various tannin-containing adhesive dips as a function of percent resorcinol. 1, pecan pith sulfite extract 2, purified pine bark tannin 3, pine bark sulfite extract 4, peanut skin tannin.

Use In pressure-sensitive wet lay-up and hot-melt adhesives, dip coating, spraying, and spreading applications. 

Denflex. [Diversified Compounders] Natural rubber latexes and compds. used for adhesive, dipping, coating, foam, molded matttials. 

Hartex . [Firestone Syn. Rubber] Low ammonia natural rubber latex used for adhesives, dipped goods, foam rubber formulations. 

Heveanol. [Heveatex] Natural rubber latexes and conq>ds. used for adhesive dipping compds., foam ctunpds., coat-if s for textiles, ptqwr, etc. 

Wire and fiberglass, being high-modulus inorganic belt cords, are not processed like textile cords. Steel cord is brass plated at the foundry and, thus, can be used directly at the calendars. Glass yarn is treated with adhesive dip and then used directly in the weaving operation. 

Properties Permanently fusible sol. in water, ketones, alcohols Uses Adhesion promoter, bonding agent for rubber compds., latex dips, for bonding syn. industrial fabrics to rubber, adhesives in wood gluing, esp. marine plywood saturant water-resistant additive for starch adhesives tackifier for nitrile rubbers tire-cord adhesive adhesive dips for mech. goods, fabrics, V belts Manuf/Distrib. Indspec... 

Primer tank 2. Agitation 3. Oven for primer drying 4. Second tank for adhesive dipping 5. Oven for adhesive drying... 

The standard aqueous treatment for textile adhesion is based on resorcinol/formaldehyde resin/latex (RFL) dip systems. A typical formulation for such an adhesive dip is given in Table 9.1. 

The RFL adhesive dip is prepared by dissolving the resorcinol in water, adding the formaldehyde and then the alkali as condensation catalyst, to produce the aqueous solution of the resin condensate. This generally takes place at room temperature in about 6 hours. 

These systems can be used alone, with untreated fabrics. However, if they are used in conjunction with adhesive dipped fabrics, both systems will contribute to the adhesion, and achieved levels can be significantly higher than with either system alone. 

About 99% of all ethylbenzene produced is converted to styrene, which is used to make SBR for the rubber industry as well as polystyrene and ABS for the plastics industries. Also, styrene is used to make SBVP latex (for use in RFL adhesive dips) as well as to produce styrenic block polymers, such as SIS, SBS, SEES, and SEPS, which are used as thermoplastic elastomers. 

To obtain a high level of adhesion it is recommended that the formaldehyde-to-resorcinol mol ratio of the adhesive dip be in the range of 2 1 (Fig. 6). 

Adhesion can be affected by the resin-to-latex ratio in the adhesive dip. Too much resin in the adhesive can result in stiff cords with poor fa-... 

There is practically no adhesion between polyester tire cord and RFL adhesive dip. Poor... 

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