Carnauba wax

From Wikipedia, the free encyclopedia
Carnauba wax

Carnauba (/kɑːrˈnɔːbə, -naʊ-/; Portuguese: carnaúba [kahnaˈubɐ]), also called Brazil wax and palm wax, is a wax of the leaves of the carnauba palm Copernicia prunifera (Synonym: Copernicia cerifera), a plant native to and grown only in the northeastern Brazilian states of Pernambuco, Piauí, Ceará, Maranhão, Bahia, and Rio Grande do Norte.[1] It is known as "queen of waxes"[2] and in its pure state, usually comes in the form of hard yellow-brown flakes. It is obtained from the leaves of the carnauba palm by collecting and drying them, beating them to loosen the wax, and then refining and bleaching the wax.[3] As a food additive, its E number is E903.

Composition[]

Carnauba palm

Carnauba consists mostly of (40 wt%), diesters of 4-hydroxycinnamic acid (21.0 wt%), ω-hydroxycarboxylic acids (13.0 wt%), and fatty alcohols (12 wt%). The compounds are predominantly derived from acids and alcohols in the C26-C30 range. Distinctive for carnauba wax is the high content of diesters as well as .[4]

Carnauba wax is sold in several grades, labeled T1, T3, and T4, depending on the purity level. Purification is accomplished by filtration, centrifugation, and bleaching.

Chocolate dragées coated with carnauba wax

Properties[]

Carnauba wax can produce a glossy finish and as such, is used in automobile waxes, shoe polishes, dental floss, food products such as sweets, instrument polishes, and floor and furniture waxes and polishes, especially when mixed with beeswax and with turpentine. Use for paper coatings is the most common application in the United States.[5] It was commonly used in its purest form as a coating on speedboat hulls in the early 1960s to enhance speed and aid in handling in salt water environments.[citation needed] It is also the main ingredient in surfboard wax, combined with coconut oil.[citation needed]

Because of its hypoallergenic and emollient properties as well as its gloss, carnauba wax appears as an ingredient in many cosmetics formulas, where it is used to thicken lipstick, eyeliner, mascara, eye shadow, foundation, deodorant, various skincare preparations, sun care preparations, etc.[citation needed] It is also used to make cutler's resin.

It is the finish of choice for most briar tobacco or smoking pipes. It produces a high gloss finish when buffed that dulls with time rather than flaking off (as is the case with most other finishes used).

Although too brittle to be used by itself, carnauba wax is often combined with other waxes (principally beeswax) to treat and waterproof many leather products, where it provides a high-gloss finish and increases leather's hardness and durability.

It is also used in the pharmaceutical industry as a tablet-coating agent. Adding the carnauba wax aids in the swallowing of tablets for patients. A very small amount (less than a hundredth of one percent by weight, i.e., 30 grams for a 300 kg batch) is sprinkled onto a batch of tablets after they have been sprayed and dried. The wax and tablets are then tumbled together for a few minutes before being discharged from the tablet-coating machine.[citation needed]

In 1890, Charles Tainter patented the use of carnauba wax on phonograph cylinders as a replacement for a mixture of paraffin and beeswax.

Carnauba wax may be used as a mold release agent for manufacture of fibre-reinforced plastics. An aerosol mold release agent is formed by dissolving carnauba wax in a solvent. Unlike silicone or PTFE, carnauba is suitable for use with liquid epoxy, epoxy molding compounds (EMC), and some other plastic types and generally enhances their properties[citation needed]. Carnauba wax is not very soluble in chlorinated or aromatic hydrocarbons.[6] Carnauba is used in melt/castable explosives to produce an insensitive explosive formula such as Composition B, which is a blend of RDX and TNT.

Production and export[]

In 2006, Brazil produced 22,409 tons of carnauba wax, of which 14% was solid wax and 86% was in powder form. There are 20-25 exporters of carnauba wax in Brazil who buy the carnauba wax from middlemen or directly from farmers. The exporters refine the wax before exporting it to the rest of the world. The four largest exporters of carnauba wax are Pontes, Brasil Ceras, Foncepi, and Carnauba do Brasil, who together account for around €25 million of the export market. According to the German television program Markencheck, conditions for many carnauba production workers are quite poor; one Brazilian Labor Ministry official found conditions "that could be described as slavery."[7][8]

According to the Brazilian Ministry of Development, Industry and Foreign Trade, the major destinations for exported carnauba wax are:

  • USA (25%)
  • Japan (15–25%)
  • Germany (10–15%)
  • Netherlands (5%)
  • Italy (5%)
  • Other destinations (18%)

In light of the challenges in the supply chains, the Initiative for Responsible Carnauba (IRC) was founded in 2018 as part of the Private Business Action for Biodiversity project and together with the Union for Ethical BioTrade (UEBT). The IRC’s aim is to foster a responsible carnauba wax production that respects workers’ rights and preserves biodiversity in the carnauba wax-producing areas. In an established working group with 20 companies, among them local manufacturers and international distributors and brands, the IRC has set social, traceability and biodiversity standards for the sector and helped local wax companies to implement them, with support of UEBT.[9] The initiative also participated to the creation of a manual of good practices for the sector[10] and 12 short learning videos[11] (available on YouTube and suitable to be shared via WhatsApp) to inform field workers about their rights and good biodiversity practices, developed in collaboration with the local NGO Associação Caatinga.

Technical characteristics[]

  • INCI name is Copernicia cerifera (carnauba) wax
  • Melting point: 82–86 °C (180–187 °F), among the highest of natural waxes, higher than beeswax, 62–64C.[12]
  • Relative density is about 0.97
  • It is among the hardest of natural waxes.
  • It is practically insoluble in water, soluble by heating in ethyl acetate and in xylene, and practically insoluble in ethyl alcohol.

References[]

  1. ^ Steinle, J. Vernon (September 1936). "Carnauba wax: an expedition to its source". Industrial & Engineering Chemistry. 28 (9): 1004–1008. doi:10.1021/ie50321a003.
  2. ^ Parish, Edward J.; Terrence L. Boos; Shengrong Li (2002). "The Chemistry of Waxes and Sterols". In Casimir C. Akoh, David B. Min. (ed.). Food lipids: chemistry, nutrition, and biochemistry (2nd ed.). New York: M. Dekker. p. 103. ISBN 0-8247-0749-4.
  3. ^ Associacao Caatinga, BMU-IKI/GIZ (2019). "Good Practices Manual for the Carnauba supply chain" (PDF). Archived from the original (PDF) on 2019-12-05. Retrieved 2019-12-05.
  4. ^ Uwe Wolfmeier, Hans Schmidt, Franz-Leo Heinrichs, Georg Michalczyk, Wolfgang Payer, Wolfram Dietsche, Klaus Boehlke, Gerd Hohner, Josef Wildgruber "Waxes" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2002. doi:10.1002/14356007.a28_103.
  5. ^ "The Dangers of Carnauba Wax Explained: Stay Safe!". Maple Holistics. 2017-11-17. Retrieved 2019-03-19.
  6. ^ Apps, E. A. (1958). Printing Ink Technology. London: Leonard Hill Books ltd. pp. 86.
  7. ^ Der Haribo-Check. Markencheck (in German). ARD. October 16, 2017.
  8. ^ Knight, Ben (October 19, 2017). "Haribo gummy bear ingredients made by modern slaves, documentary shows". Deutsche Welle. Retrieved October 29, 2017.
  9. ^ "Initiative for Responsible Carnauba". The Union for Ethical BioTrade. Retrieved 2020-10-20.
  10. ^ "Manual of good practices for the Carnauba production chain". The Union for Ethical BioTrade. Retrieved 2020-10-20.
  11. ^ "Boas Práticas na Cadeia Produtiva da Carnaúba". Associacao Caatinga (in Portuguese). Retrieved 2020-10-20.
  12. ^ Wu, X. (July 2020). "Hybrid Graphene/Carbon Nanofiber Wax Emulsion for Paper‐Based Electronics and Thermal Management". Advanced Electronics Materials. 6 (7): 2000232. arXiv:2004.11476. doi:10.1002/aelm.202000232. S2CID 216144540.

External links[]

Retrieved from ""