Hexamethylenediamine is force majeure again! Where is the soaring HDI system?

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Hexamethylenediamine is force majeure again! Where is the soaring HDI system?

On April 21, BASF stated that the company received a force majeure notice from a raw material supplier. Raw materials such as adiponitrile (ADN), hexamethylenediamine (HMD), and AH-salt will all be reduced in supply. Hexamethylenediamine is a strong basic organic substance, an important chemical raw material, and a toxic substance that has physiological effects on the human body. Hexamethylenediamine is mainly used in organic synthesis, the most important downstream of which are PA66 and HDI. Affected by this, the already soaring price of HDI curing agent may further rise.

Since September 2020, the price of HDI curing agent has been rising from a low price of 35,000/ton. Breaking through 130,000 yuan/ton, but at such a high price, it is still hard to find goods. The soaring price of HDI curing agent is closely related to the tight supply of its upstream raw materials hexamethylenediamine and adiponitrile. Since the second half of 2019, plants such as INVISTA USA, INVISTA-Solvay France's adiponitrile, BASF's hexamethylenediamine, and Ascend have experienced force majeure to varying degrees, and the global supply of adiponitrile/hexanediamine has continued to be tight. At the beginning of this year, affected by the extremely cold weather, INVISTA and Ascend successively announced force majeure on hexamethylenediamine, and the global supply of hexamethylenediamine became increasingly tight.

HDIas Aliphatic II The most important monomer in isocyanate (ADI), accounting for about 60% of the total ADI demand. HDIThe monomer is mainly used in adhesives, accounting for about HDI is about 10% of the demand, but monomer volatility and It is highly toxic, so it is generally prepared asHDIclass derivation and used as a curing agent for polyurethane coatings. HDI curing agent is not directly connected to the carbon atom on the benzene ring The isocyanate group is not easy to be oxidized, which makes the most notable feature of this kind of coating is yellowing resistance and weather resistance. It is the best in the family of polyurethane coatings. >HDIWidely used in automotive, wood, industrial coatings. Currently on the market based onHDIThe main polyisocyanates areHDItrimer andHDIbiuret. In addition, companies continue to work onHDINew curing agent

HDI-TMP addition Matter - composed of three moleculesHDIwith one molecule of three Methylolpropane is formed by catalytic reaction and is mainly used as a curing agent for polyurethane adhesives.

The polyurethane adhesive made of it, because Its low temperature resistance, shear resistance, impact resistance, high bond strength and other properties are widely used, especially in adhesives, automobile windshields and wood-based panels, with an annual growth rate of more than 5%. HDI-TMP adducts have a simple synthesis process and great market potential.

blocked polyisocyanate-- HDIBlocked isocyanate formed by blocking with phenol, ε-caprolactam, etc., Can be combined with various oligomer polyols. This type of curing agent can be used to formulate one-component baking coatings for various metal and plastic coatings, such as wire enamels and coil coatings. It is generally mixed with other curing agents, such as melamine curing agent, to reduce costs and improve performance.

HDI-TDIMixed polymers--a certain proportionHDIandTDIIt is made under the action of catalyst. It has the characteristics of anti-yellowing and low viscosity, because the production cost is lower thanHDIbiuret andHDI trimer, use It is suitable for making two-component polyurethane varnish or paint, and has high cost performance.

In addition, withHDI In-depth research, othersHDICuring agent such asHDIuretdione polyisocyanate, biobasedHDIpolymer,HDI-HMDI adducts, etc.HDI derivatives also being developed and marketed.

Polyurethane coatings are now mainstream in many applications The technology has been widely recognized, and it can reduce the emission of organic volatiles.HDIThe curing agent will be more widely used in the future. Tiantian Chemical Network predicts that China's futureHDIIndustry compound growth rate It is expected to remain at around 10%, and there is huge room for future development.

Polyurethane coatings are now mainstream in many applications The technology has been widely recognized, and it can reduce the emission of organic volatiles.HDIThe curing agent will be more widely used in the future. Tiantian Chemical Network predicts that China's futureHDIIndustry compound growth rate It is expected to remain at around 10%, and there is huge room for future development.