Q&A for TPU Leather Base

It's glad to introduce PHA Corporation

▒▒ Q: What is DMF ?▒▒

Dimethylformamide is an organic compound with the formula (CH3)2NC(O)H. Commonly abbreviated as DMF (although this acronym is sometimes used for dimethylfuran), this colourless liquid is miscible with water and the majority of organic liquids. DMF is a common solvent for chemical reactions. Dimethylformamide is odorless whereas technical grade or degraded samples often have a fishy smell due to impurity of dimethylamine. As its name indicates, it is a derivative of formamide, the amide of formic acid.
Dimethylformamide is a polar (hydrophilicaprotic solvent with a high boiling point. It facilitates reactions that follow polar mechanisms, such as SN2 reactions. Dimethylformamide can be synthesized from methyl formate and dimethylamine or by reaction of dimethylamine with carbon monoxide.[3] Dimethylformamide is reactive toward strong bases such as sodium hydroxide or strong acids such as hydrochloric acid or sulfuric acid and is hydrolyzed back into formic acid and dimethylamine, especially at elevated temperatures.

▒▒ Q: DMF have toxic?▒▒

DMF has been linked to cancer in humans, and it is thought to cause birth defects.[14] In some sectors of industry, women are banned from working with DMF. For many reactions, it can be replaced with dimethyl sulfoxide. Most manufacturers of DMF list 'Life' or 'Chronic' as a health hazard in their MSDS since DMF is not readily disposed of by the body. According to IARC, DMF is a possible carcinogen, although EPA does not consider it a cancer risk.

Acting on reports of health consequences related to consumer exposure to the chemical dimethylfumarate (DMF), the Commission of the European Union (EU) has added DMF to the list of restricted chemicals under its regulations concerning the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH)
Published in the Official Journal of the European Union, in May 2012, the new regulation bans the use of DMF in any article in concentrations greater than 0.1 mg/kg.

DMF is a biocide intended to prevent or inhibit the growth of mold on leather furniture or footwear during storage or transport in humid environments. The Commission’s actions related to DMF follows reports that furniture and footwear containing DMF and available for sale in several EU member states have been linked to consumer health issues in France, Poland, Finland, Sweden and the United Kingdom.

▒▒ Q: What's the difference between PHA's TPU leather and the traditional PU leather (wet and dry process)?▒▒

The biggest difference is that PHA's TPU leather doesn't use organic solvents and non-environmental materials used in the PU manufacturing process, making our process more energy-efficient and lowering our CO2 emission, while better ensuring the health of our product users.

▒▒ Q: What is organic solvent? ▒▒

Traditional PU polymerization involves organic solvents like DMF, dimethylformamide, to control PU viscosity so that the PU can be easily processed and coated. DMF is a colorless moisture-absorbing liquid with a pungent odor and high boiling point, soluble in water, alcohol, and acetone. Organic solvents emitted during traditional PU processing would eventually become greenhouse gases, solvent elimination consumes a lot of energy, and the traditional process cannot completely eliminate DMF from the product. Sometimes, residual solvents might induce respiratory disturbances in patients with a weak respiratory system (like asthmatic patients). EU and other nations have listed DMF as a restricted toxic substance. Various renowned European sellers have demanded that the products be DMF-free, which we (PHA) can achieve.

▒▒ Q: What is DMFu (dimethyl fumarate)? How is different with DMF?▒▒

DMFu is "dimethyl fumarate." Unlike DMF (dimethylformamide--a solvent used in traditional PU synthetic leather processes), DMFu (dimethyl fumarate) is more of an anti-fungal chemical people place in their sofas or leather products to prevent mold from growing. Ocean Plastics' PU products do not use DMFu; they're DMFu-free, and we've made our products DMF-free as well.