28182-81-2

Usage

Uses

Used in Polymer Industry:
POLY(HEXAMETHYLENE DIISOCYANATE) is used as a compatibilizer to increase the complex viscosity of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/poly(lactic acid) biopolymer-based blends. This enhancement in viscosity improves the overall properties of the blend, making it suitable for various applications within the polymer industry.
Used in Coatings Industry:
POLY(HEXAMETHYLENE DIISOCYANATE) is used as a hardener that can be mixed with polyol resins to form polyurethane coatings. These coatings have a wide range of applications, including self-cleaning properties, making them valuable in various industries such as automotive, construction, and consumer goods.

Potential Exposure

Used to make other chemicals, coat ings, and polyurethane. It is also used as a hardener in automobile and airplane paints.

Shipping

UN2281 Hexamethylene diisocyanate, Hazard Class: 6.1; Labels: 6.1-Poisonous materials.

Incompatibilities

May form explosive mixture with air. Isocyanates are highly flammable and reactive with many compounds, even with themselves. Incompatible with oxi dizers (chlorates, nitrates, peroxides, permanganates, per chlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Reaction with moist air, water or alcohols may form amines and insoluble polyureas and react exothermically, releasing toxic, corrosive or flamma ble gases, including carbon dioxide; and, at the same time, may generate a violent release of heat increasing the con centration of fumes in the air. Incompatible with amines, aldehydes, alkali metals, ammonia, carboxylic acids, capro lactum, alkaline materials, glycols, ketones, mercaptans, hydrides, organotin catalysts, phenols, strong acids, strong bases, strong reducing agents such as hydrides, urethanes, ureas. Elevated temperatures or contact with acids, bases, tertiary amines, and acyl-chlorides may cause explosive polymerization. Attacks some plastics, rubber and coatings. Contact with metals may evolve flammable hydrogen gas. May accumulate static electrical charges, and may cause ignition of its vapors. Temperatures above 200℃ can cause polymerization. Attacks copper.

Upstream product

• 124-09-4 1,6-Hexanediamine 
• 75-44-5 phosgene 
• 124-38-9 carbon dioxide 
• 503-38-8 trichloromethyl chloroformate 
• 98-13-5 Phenyltrichlorosilane 
• 1266554-70-4 N,N'-hexanediyldicarbamic acid di(4-(1,1,3,3-tetramethylbutyl)phenyl) ester 
• 6030-54-2 1,6-bis(methoxycarbonylamino)hexane 
• 10027-07-3 suberoyl chloride 
• 505-48-6 octane-1,8-dioic acid 
• 60-29-7 diethyl ether 
• 40777-33-1 hexane-1,6-diyl dicarbamate 
• 6055-52-3 hexane-1,6-diamine dihydrochloride 
• 4223-31-8 N,N′-hexanediyl bis-carbamic acid diphenyl ester 
• 102-09-0 bis(phenyl) carbonate 

Downstream Products

• 102600-73-7 1,1'-diphenyl-4,4'-hexanediyl-di semicarbazide 
• 22214-23-9 N',N'''-dioctadecyl-N,N''-hexanediyl-di-urea 
• 3066-64-6 N,N'-hexanediyl-bis-carbamic acid dicyclohexyl ester 
• 42101-54-2 C₃₂H₅₈N₄O₂ 
• 16644-54-5 N,N'-bis(tert-butoxycarbonyl)-1,6-hexanediamine 
• 60034-96-0 N,N'-Hexamethylen-bis-mesitylsaeureamid 
• 296247-94-4 Bis[(2-fluorenylmethoxy)carbonyl]hexane-1,6-diamine 
• 310441-95-3 6-{2-[4-(4-nitrophenylazo)-N-ethylphenylamino]ethoxycarbonylamino}hex-1-yl isocyanate 

Relevant academic research and scientific papers

Enhanced activity of CuO/ZnO catalyst on the decomposition of dimethylhexane-1,6-dicarbamate into dimethylhexane-1,6-diisocyanate

To decompose dimethylhexane-1,6-dicarbamate (HDC) to hexamethylene diisocyanate (HDI), mixed CuO and ZnO catalysts with Cu/(Cu + Zn) ratio of 4 and 8% were prepared by coprecipitation (CP), sequential precipitation (SP) and incipient wetness impregnation (IW). The SP-derived CuO/ZnO catalysts showed higher HDC yields than those derived by CP and IW. The IW method produced CuO/ZnO catalysts consisting of larger CuO and ZnO particles compared to the two precipitation methods. The CP method led to substitution of Zn2+ by Cu2+ in the hydrozincite precursor phase, resulting in higher BET and Cu surface areas of CuO–ZnO catalysts due to intimate intergrowth of nano-sized particles. However, the inherent character of ZnO in the CP-derived catalysts was modified by interfacial contact between CuO and ZnO identified by UV–visible and Raman spectra. In contrast, the properties of CuO and ZnO, as well as the relatively large surface areas, were kept in the SP-derived catalysts owing to deposition of Cu precipitates to fully aged Zn precipitates. This is believed to be a benefit of the SP method for the reaction. Therefore, our preparation approach has great potential to be extended to various mixed oxide catalysts.

Synthesis of isocyanates from carboxylic acids using diphenylphosphoryl azide and 1,8-bis(dimethylamino)naphthalene

A simple phosgene-free method for the synthesis of high-purity isocyanates from carboxylic acids was developed using diphenylphosphoryl azide and 1,8-bis(dimethylamino)naphthalene. Yields for evaluated monoisocyanates ranged from 60.0% to 81.5%.

METHOD FOR PRODUCING CARBAMATE AND METHOD FOR PRODUCING ISOCYANATE

The present invention provides a method for producing a carbamate that includes a step (1) and a step (2) described below: (1) a step of producing a compound (A) having a urea linkage, using an organic primary amine having at least one primary amino group per molecule and at least one compound selected from among carbon dioxide and carbonic acid derivatives, at a temperature lower than the thermal dissociation temperature of the urea linkage; and(2) a step of reacting the compound (A) with a carbonate ester to produce a carbamate.

Method for preparing isocyanate with low hydrolytic chlorine content by gas phase method

The invention relates to a method for preparing isocyanate with low hydrolytic chlorine content by a gas phase method, which comprises the following steps of: carrying out phosgenation reaction on corresponding amine and stoichiometric excess phosgene in a reaction zone in the presence or absence of an inert medium; wherein the reaction conditions are selected such that at least the reaction components amine, isocyanate and phosgene are gaseous under these conditions, and feeding of at least one gas stream comprising amine and at least one gas stream comprising phosgene into the reaction zone, and introducing of a carbon dioxide stream in a quenching zone at the rear end of the reaction zone are carried out, and the molar content of the carbon dioxide stream is less than 60% of the molar weight of the phosgene stream, so that the isocyanate with low hydrolytic chlorine content can be obtained more easily, the product yield is improved, and the investment cost of the device is reduced.

Method for manufacturing pentamethylene diisocyanate

The present invention provides a method for manufacturing pentamethylene diisocyanate. The method for manufacturing pentamethylene diisocyanate of the present invention manufactures intermediates by using dialkyl carbonate. By thermally decomposing the intermediates under a specific polymerization inhibitor, the method can manufacture the pentamethylene diisocyanate having excellent purity in a high yield.

METHOD OF PREPARING DIISOCYANATE COMPOSITION

In the embodiments, an aqueous hydrochloric acid solution instead of hydrogen chloride gas and solid triphosgene instead of phosgene gas may be used in the process of preparing a diisocyanate from a diamine through a diamine hydrochloride. In addition, the embodiments provide processes for preparing a diisocyanate composition and an optical lens, which are excellent in yield and quality with mitigated environmental problems by controlling the size of the diamine hydrochloride composition, the b* value according to the CIE color coordinate of the diamine hydrochloride composition, or the content of water in the diamine hydrochloride composition within a specific range.

METHOD OF PREPARING DIISOCYANATE COMPOSITION AND OPTICAL LENS

In the embodiments, an aqueous hydrochloric acid solution and an organic solvent instead of hydrogen chloride gas and solid triphosgene instead of phosgene gas may be used in the process of preparing a diisocyanate from a diamine through a diamine hydrochloride. In addition, the embodiments provide processes for preparing a diisocyanate composition and an optical lens, which are excellent in yield and quality with mitigated environmental problems by controlling the total content of metals, cations, or anions in a diamine hydrochloride composition.

Method for preparing low-chlorinated impurity content isocyanate based on salt formation light gasification (by machine translation)

The invention provides a method for preparing low-chlorinated impurity content isocyanate based on a salt-formation light gasification method. The proportion of the salt particle size distribution obtained by the salt formation reaction in the average particle size ±30% range is 70% or more, the average residence time without stirring is less than 60 min, and the product obtained by the method has lower chlorinated impurity content. (by machine translation)

ISOCYANATE PRODUCTION METHOD

An isocyanate production method according to the present invention is a method in which an isocyanate is produced by subjecting a carbamate to thermal decomposition, and includes: a step of preparing a mixture liquid containing the carbamate, an inactive solvent and a polyisocyanate compound; a step of conducting a thermal decomposition reaction of the carbamate by continuously introducing the mixture liquid into a thermal decomposition reactor; a step of collecting a low-boiling decomposition product by continuously extracting the low-boiling decomposition product in a gaseous state from the reactor, the low-boiling decomposition product having a boiling point lower than the polyisocyanate compound; and a step of collecting a high-boiling component by continuously extracting, from the reactor, a liquid phase component which is not collected in a gaseous state at the step of collecting the low-boiling decomposition product.

MULTISTEP PROCESS FOR THE PREPARATION OF HEXAMETHYLENE DIISOCYANATE, PENTAMETHYLENE DIISOCYANATE OR TOLUENE DIISOCYANATE

The present invention relates to a multistep process for the preparation of organic diisocyanates by converting the corresponding diamine precursors, urea and hydroxy compounds into monomeric diurethanes, converting these diurethanes into diurethanes of high boiling hydroxy compounds, and finally cleavage of the latter diurethanes to form the diisocyanates and recover the high boiling hydroxy compounds.