Propionic acid zinc salt

Synonyms propanoic acid, zinc salt propionic acid, zinc salt. Appearance white platelets or needlelike crystals (for the monohydrate). 

SlK Propionate. Zinc propionate occurs as an anhydrous form and as a monohydrate. It is very soluble in water but only sparingly soluble in alcohol. The salt is unstable to mture, forming zinc hydroxide and propionic acid. Zinc prapionaie is used as a fungicide, particularly on adhesive ape. 

Activators. Activators are chemicals that increase the rate of vulcanization by reacting first with the accelerators to form mbber soluble complexes. These complexes then react with the sulfur to achieve vulcanization. The most common activators are combinations of zinc oxide and stearic acid. Other metal oxides have been used for specific purposes, ie, lead, cadmium, etc, and other fatty acids used include lauric, oleic, and propionic acids. Soluble zinc salts of fatty acid such as zinc 2-ethyIhexanoate are also used, and these mbber-soluble activators are effective in natural mbber to produce low set, low creep compounds used in load-bearing appHcations. Weak amines and amino alcohols have also been used as activators in combination with the metal oxides. 

Malic and citric acids have been adequately identified from molasses as their crystalline hydrazides.119 It is probable that at least the former is a normal juice constituent. Lactic acid was identified as its zinc salt in molasses119 it arises from bacterial action. Formic acid is present119 it probably has an origin, at least in part, in sugar decomposition. Acetic and propionic acids are components and their amounts serve as a rough index of the activity of the microorganisms introduced into the molasses. The microbial count of cane juice, molasses and related products has been determined (Table IV).190... 

Current proprietary brands of zinc oxide-eugenol may contain a variety of alternative accelerators. Acetic acid (0.1-2%) can be included in the eugenol, and some sort of zinc salt, such as zinc propionate [23], zinc succinate [23] or zinc acetate [24] blended with the zinc oxide. These combinations result in cements that set more rapidly than zinc oxide with eugenol alone, and at least part of the effectiveness of these accelerators arises from their highly hydrophilic nature, which causes the newly mixed cement pastes to absorb water from the surroundings more readily. Water has been shown to be an essential component of the reaction mixture [25,26], and high ambient humidity therefore improves the speed of the setting reaction [25]. 

Reduction with zinc in propionic acid of the ketoimmonium or the keto-ammonium salts 23 and 24 lead to benzazepine 25. ... 

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