<b>130,000/ton? IPDI: An Introduction to Isophorone Diisocyanate</b>

In April 2021, the quotation of IPDI sporadic orders will be around 110,000-130,000 yuan/ton. At the end of last year, the price was still around 80,000 yuan/ton. Where is such a high-priced IPDI?

IPDI, the full name isophorone diisocyanate. The chemical formula is C12H18N2O2, which is an alicyclic diisocyanate. IPDI is one of the least active diisocyanate products in common use. The reaction is stable. Its two isocyanate groups have different reactivity about ten times different, which is beneficial to the preparation of various prepolymers, and its vapor pressure is low. Use It is safer to operate. It is polyurethane with composite propellantAdhesiverequired hydroxyl prepolymer (ie Polypropylene glycol)Curing Agent. InPlasticIt is widely used in industries such as plastics, adhesives, medicine and spices.

Chemical name: 3-isocyanatomethylene-3,5,5-trimethylcyclohexyl isocyanate.

Alias: 3-Isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate; 5-Isocyanato-1-(isocyanatomethyl)-1,3,3-trimethylcyclohexane; IPDI

IPDI products are a mixture of 75% cis and 25% trans isomers.

Molecular formula: C12H18N2O2

Relative molecular mass: 222.29.CAS

CAS number: 4098-71-9.

EINECS Number: 223-861-6

Physicality

Isophorone diisocyanate IPDI is a colorless or light yellow liquid with a camphor-like odor, completely compatible with organic solvents such as esters, ketones, ethers, aromatic hydrocarbons and aliphatic hydrocarbons. Miscible.

Density: 1.056

Melting point: -60°C

Boiling point: 158°C (15 mmHg)

Refractive index: 1.484

Flash point: >110°C

Water solubility: <0.1 g/100 mL at 25°C

Performance indicators

IPDI products (brand Desmodur I) indicators are: purity ≥ 99.5%, NCO mass fraction ≥ 37.5%, chroma (Hazen) ≤ 30, hydrolyzed chlorine ≤ 200mg/ kg, total chlorine ≤400mg/kg, viscosity (25°C) about 10mPa.s.

Safe Data

Dangerous Goods Mark: T;N

Hazard category code: R22;R36/37/38;R42/43;R51/53

Safety instructions: S26;S28;S38;S45;S61

Dangerous Goods Shipping Number: UN 2290/2906

Features and uses

IPDI is an aliphatic isocyanate, isophorone diisocyanate IPDI is also a cycloaliphatic isocyanate, isophorone diisocyanate IPDI is less reactive than aromatic isocyanate, The vapor pressure is also low. The reactivity of the two NCO groups in the isophorone diisocyanate IPDI molecule is different, because the primary NCO in the IPDI molecule is hindered by the cyclohexane ring and the a-substituted methyl group, so that the secondary NCO attached to the cyclohexane The reactivity of NCO group is 1.3-2.5 times higher than that of primary NCO; the reaction speed of IPDI and hydroxyl group is 4-5 times faster than that of HDI and hydroxyl group.

Polyurethane resin made of isophorone diisocyanate IPDI has excellent light stability and chemical resistance, and isophorone diisocyanate IPDI is generally used to make high-grade High-quality polyurethane resins such as light-resistant and weather-resistant polyurethane coatings, wear-resistant and hydrolysis-resistant polyurethane elastomers, and isophorone diisocyanate IPDI can also be used to make non-yellowing microcellular polyurethane foams

Preparation: IPDI byacetonemade by cyclizationisophorone, isophorone and hydrocyanic acidAction to get nitrile, then react with ammonia gas to get isophoroneiminonitrile, and further hydrogenate it with cobalt catalystIsophorone diamine (IPDA), and finally synthesize diamine hydrochloride for phosgenation or synthetic carbamate for thermal cracking to get IPDI. Because of the high vapor pressure of the product, it is industrially made into a trimer for use.

As can be seen from the above, the main raw material of IPDI isIsophorone,Isophorone (IP for short) is an important ketone solvent with high boiling point and low hygroscopicity. Important solvents in plastics, adhesives, pharmaceuticals, inks, pesticides and other industries.

Affected by the rising cost of upstream raw materials and strong downstream demand, the price of domestic isophorone products has been rising all the way. From 16,000 yuan/ton at the beginning of the year to nearly 22,000 yuan/ton now, the production of isophorone has a certain technical threshold, and only a few domestic enterprises have production capacity. It is reported that some isophorone manufacturers have temporary maintenance plans in the near future, and the supply of products will be further reduced. With the strong support of the industrial chain and market demand, it is estimated that the price of isophorone will continue to rise. And IPDI is affected by it, and the price may rise further.

or:#333333">Action to obtain nitrile, then react with ammonia to obtain isophorone iminonitrile, and further hydrogenate it under the action of cobalt catalystisophorone diamine (IPDA), and finally synthesize the hydrochloride of diamine for phosgenation or synthesis of carbamate for thermal cracking to obtain IPDI. Due to the high vapor pressure of the product , industrially made trimer application.

130,000/ton? IPDI: An Introduction to Isophorone Diisocyanate

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