557-05-1 Usage
Outline
Zinc stearate is white light fine powder. Formula is ZN (C17H35COO) 2, molecular structure is? RCOOZnOOCR (R is alkyl group of industry stearate), it is combustible, specific gravity is 1.095, ignition point is 900℃, density is 1.095, melting point is 130℃, it has creamy feel. It is insoluble in water, alcohol, ether, soluble in hot ethanol, turpentine, benzene and other organic solvents and acids. Zinc stearate is heated and dissolved in organic solvent, when exposes cold, it becomes jelly, when meets strong acid, it can decompose into stearic acid and corresponding zinc. It has lubricity, hygroscopic, non-toxic, slightly irritating, non-polluting, non-hazardous properties. For zinc stearate is dissolved in benzene and calcium stearate is benzene-insoluble, it is possible to separate the calcium stearate and zinc stearate.
Zinc stearate is not soluble in polar solvents, but when be heated, it is high dissolved in aromatic compound agent chlorinated hydrocarbons. The main application areas are plastics and rubber industry, it is used as lubricant and release agent for excellent compatibility.
Uses
Different sources of media describe the Uses of 557-05-1 differently. You can refer to the following data:
1. 1. Zinc stearate can be used as rubber products soften lubricants, textiles lighting agent, PVC stabilizers.
2. It can be used as stabilizer in polyvinyl chloride plastics, rubber softener.
3. Zinc stearate can be used in the pharmaceutical industry, preparation of solidified oil and lubricants, it can be also used as paint drying agent. Non-toxic products for PVC and rubber processing, the synergy of calcium stearate and barium stearate can effectively improve PVC and rubber for light and heat stability, PVC processing amount is usually <1; it can be used for touch agent of rubber products, it can also be used as polymeric additive of PP, PE, PS, EPS and pencil manufacturing, it is generally used in the amount of 1 to 3 parts.
2. Used in Rubber, Plastic, Poyester, Abbrasive, Coating, Printing Inks and PVC Industry.
3. In tablet manufacture; in cosmetic and pharmaceutical powders and ointments; as a flatting and sanding agent in lacquers; as a drying lubricant and dusting agent for rubber; as a plastic mold releasing agent; as a waterproofing agent for concrete, rock wool, paper, textiles.
4. zinc stearate is used in cosmetic formulations to increase adhesive properties. It is also used as a coloring agent. This is a mixture of the zinc salts of stearic and palmitic acids.
How to remove residual zinc stearate of aluminum surface processing
It is generally used polish manner to treat residual zinc stearate. It maybe damage the substrate when uses lure acid.
Product Features
Zinc stearate has good thermal stability, initial stage stainability is small, it has good light stability and it has synergy effect with calcium stearate and barium stearate, it has foam effect and it can be used as foaming aid in foam products, it can be used as the lubricant of cosmetic face powder.
Glue the pink plastic lubricants.
Zinc stearate is used as PVC stabilizers. When coordinates with barium-cadmium soap, it is mainly used in soft products, characteristic is that it can restrain initial coloration and avoid sulfide pollution. Zinc stearate can also be used styrene (polystyrene and ABC, SAN resins), phenolic resins, amino resins and plastics and other heat-curing polyester plasticizer, lubricant and release agent of transparent products. In the rubber industry, it can be used as rubber lubricants and anti-blocking agent, curing catalyst media activator.
It can be used as lighting agent of textile products.
It can be used as flatting agent in enamel paint industry.
Description
Zinc stearate is a "zinc soap" that is widely used industrially. In this context, soap is used in its formal sense, a metal "salt" of a fatty acid. It is a white solid that repels water. It is insoluble in polar solvents such as alcohol and ether but soluble in aromatic hydrocarbons (e.g., benzene and chlorinated hydrocarbons) when heated. It is the most powerful mold release agent among all metal soaps. It contains no electrolyte and has a hydrophobic effect. Its main application areas are the plastics and rubber industry where it is used as a releasing agent and lubricant which can be easily incorporated. Zinc carboxylates, e.g. basic zinc acetate, adopt complex formulas, and are not simply dicarboxylates of zinc. Instead the formula for most zinc carboxylates is Zn4O(O2CR)6, consisting of a Zn4O6+ core with carboxylate ligands spanning the edges.
Chemical Properties
Different sources of media describe the Chemical Properties of 557-05-1 differently. You can refer to the following data:
1. white powder with fatty acid odour
2. Zinc stearate occurs as a fine, white, bulky, hydrophobic powder,
free from grittiness and with a faint characteristic odor.
Application
It is widely used as a release agent for the production of many kinds of objects rubber, poly urethane, poly ester processing system, powder metallurgy. These applications exploit its "non-stick" properties . In cosmetics, zinc stearate is a lubricant and thickening to improve texture. It is an "activator" for rubber vulcanization by sulfur and accelerators. As discovered in the early days of vulcanization, zinc has a beneficial effect on the reaction of the sulfur with the polyolefin. The stearate is a form of zinc that is highly soluble in the nonpolar medium of the poly olefins. Being lipophilic, it functions as a phase transfer catalyst for the saponification of fats.
Production Methods
An aqueous solution of zinc sulfate is added to sodium stearate
solution to precipitate zinc stearate. The zinc stearate is then washed
with water and dried. Zinc stearate may also be prepared from
stearic acid and zinc chloride.
General Description
White, hydrophobic powder with a slight, characteristic odor. Mp: 130°C. Density: 1.1 g cm-3. Insoluble in water, ethyl alcohol and diethyl ether. Soluble in acids. Non-toxic. In technical grades, the percentage of zinc may vary according to the intended use. Products with less than the theoretical amount of zinc are more acidic.
Reactivity Profile
Zinc stearate is non-flammable but combustible. Incompatible with oxidizing agents, dilute acids. Emits acrid smoke and fumes of ZnO when heated to decomposition (Hazardous Chemicals Desk Reference, p. 865 (1987)).
Flammability and Explosibility
Notclassified
Pharmaceutical Applications
Zinc stearate is primarily used in pharmaceutical formulations as a
lubricant in tablet and capsule manufacture at concentrations up to
1.5% w/w. It has also been used as a thickening and opacifying
agent in cosmetic and pharmaceutical creams, and as a dusting
powder.
Safety Profile
Poison by intratracheal
route. Inhalation of zinc stearate has been
reported as causing pulmonary fibrosis. A
nuisance dust. Combustible when exposed
to heat or flame. To fight fire, use water,
foam, CO2, dry chemical. When heated to
decomposition it emits toxic fumes of ZnO.
See also ZINC COMPOUNDS.
Safety
Zinc stearate is used in oral and topical pharmaceutical formulations,
and is generally regarded as a nontoxic and nonirritant
excipient. However, following inhalation, it has been associated
with fatal pneumonitis, particularly in infants. As a result, zinc
stearate has now been removed from baby dusting powders.
LD50 (rat, IP): 0.25 g/kg
storage
Zinc stearate is stable and should be stored in a well-closed
container in a cool, dry place.
Incompatibilities
Zinc stearate is decomposed by dilute acids. It is incompatible with
strong oxidizing agents.
Check Digit Verification of cas no
The CAS Registry Mumber 557-05-1 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,5 and 7 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 557-05:
(5*5)+(4*5)+(3*7)+(2*0)+(1*5)=71
71 % 10 = 1
So 557-05-1 is a valid CAS Registry Number.
InChI:InChI=1/2C18H36O2.Zn/c2*1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20;/h2*2-17H2,1H3,(H,19,20);
557-05-1Relevant articles and documents
Synthesis of well-dispersed ZnO nanomaterials by directly calcining zinc stearate
Guo, Guangsheng,Shi, Chen,Tao, Dongliang,Qian, Weizhong,Han, Dongmei
, p. 343 - 346 (2009)
Well-dispersed ZnO nanomaterials were synthesized by direct calcination of zinc stearate. Results from Fourier transform infrared (FT-IR) spectra and X-ray diffraction (XRD) indicated both the decomposition degree of organic ligand and the purity of calci
Vibrational spectra and structures of zinc carboxylates II. Anhydrous zinc acetate and zinc stearate
Ishioka, Tsutomu,Shibata, Youko,Takahashi, Mizuki,Kanesaka, Isao
, p. 1811 - 1818 (1998)
A normal mode analysis was carried out for a monoclinic anhydrous zinc acetate crystal in which the acetate groups had bridging bidentate coordination forms, and spectral assignments were made. Based on the assignments, a relation between the coordination structure of the carboxylate groups around the zinc atom and the vibrational frequencies of the carboxylate rocking mode was found. This relation was applied to zinc stearate to determine its coordination form, and we found that zinc stearate had a bridging bidentate form.
Infrared and XAFS study on structure and transition behavior of zinc stearate.
Ishioka,Maeda,Watanabe,Kawauchi,Harada
, p. 1731 - 1737 (2000)
Structure and transition behavior of zinc(II) stearate crystal were investigated by infrared and XAFS spectroscopies. Structure of zinc stearate at room temperature was estimated as follows. From XAFS analysis, the coordination number of the carboxylate groups around the zinc atom was evaluated as 4 and the Zn-O distance as 1.95 A. Based on the infrared spectrum and a normal mode analysis, the conformation of the alkyl chain was confirmed as all-trans and the sub-cell packing was considered as parallel type, and also the coordination form of the carboxylate groups was determined as bridging bidentate type. As increasing temperature, zinc stearate has a solid liquid phase transition at 130 degrees C. At the transition, the alkyl chains goes into liquid like state as reported by Mesubi but the coordination structure was confirmed to be maintained.
Preparation method of zinc stearate
-
Paragraph 0059; 0060; 0061; 0062; 0063, (2017/08/27)
The invention provides a preparation method of zinc stearate. The preparation method of zinc stearate solves the technical problems that in an existing production process, single-pass smashing is adopted, and product uniformity is poor. The preparation method of zinc stearate includes the following steps that firstly, liquid stearic acid is delivered into a reaction kettle through a delivery pump for stirring heating, wherein the stirring time is 20-28 min, and the heating temperature is 120-150 DEG C; secondly, zinc oxide is added into the reaction kettle in three times, and a reaction is carried out at the temperature of 160-180 DEG C and the pressure of 0.18-0.24 Mpa, wherein the reaction time is 40-50 min; thirdly, zinc stearate generated after the reaction is delivered into a tabletting machine for tabletting; fourthly, tabletted zinc stearate is coarsely crushed through a common crushing machine; fifthly, coarsely-crushed zinc stearate is finely crushed through an airflow crushing system, and zinc stearate is obtained. The preparation method of zinc stearate has the advantage that product uniformity is good.
A process for the preparation of bulk zinc stearate
-
Paragraph 0023, (2017/04/03)
The invention provides a preparation method of bulk zinc stearate. The preparation method comprises the following steps: a. feeding stearic acid at normal pressure to a reaction kettle, heating up to 130-160 DEG C, then adding a catalyst and zinc oxide to the reaction kettle, and taking reaction for 80-120 minutes till reaching the molten state; b. adding an antioxidant, and stirring for 5-20 minutes; c. adding the molten zinc stearate prepared in the step b to a mold with a framework; d. cooling to obtain the required bulk zinc stearate with a certain shape. The preparation method disclosed by the invention is to add the molten zinc stearate prepared by the dry method to the framework to prepare the bulk zinc stearate, and cannot generate particles or microparticle dust in a processing workshop, so as to effectively improve the environment quality of the workshop, greatly reduce influence on health of workers in the workshop, and achieve a great promotional value and social significance.