Chain extender and small molecular materials

Chain extender and small molecular materials, the application of small molecule multifunctional compound. Small molecules more functional groups of compounds in the polyurethane materials used, glycol, polyol, alcohol amine, diamine is multi-purpose raw materials such as: dibasic alcohol, polyol, alcohol amine, diamine can be used as chain extender agent and crosslinking agent, curing agent.

Glycol and small amounts of polyols can be used in the synthesis of polyester polyol; Part of glycol, polyol, alcohol amine, diamine can be used for synthesis of polyether starting agent; Some special diamine or diisocyanate production of raw materials. Binary carboxylic acids generally used in the manufacture of polyester polyhydric alcohol.

The chain extender agent and crosslinking agent. In pu material formula, chain extension agent or crosslinking agent is a common additives. Chain extender is refers to the compounds containing two functional groups or glycol, diamine, ethanolamine, etc., through a linear polymer chain extension reaction formation; Crosslinking agent in polyurethane industry generally refers to the three faculties and four faculties degrees compounds such as alcohol, four alcohol, etc., they make polyurethane crosslinking network structure.

Chain extender agent and crosslinking agent used for various types of polyurethane materials, including molded foam polyurethane elastomer, microcellular polyurethane elastomer, RIM polyurethane, thermoplastic polyurethane elastomer, polyurethane coating, adhesive, semi-hard foam, high resilience foam, etc.

Chain extender agent and crosslinking agent is small molecules, in the polyurethane molecular contribution to produce hard segment content. On the premise of meet the curing, chain extension agent, the more is, the more appropriate dosage of diisocyanate, high content of hard segment of polyurethane, the resulting high strength, high hardness of the material. Chain extender agent and crosslinking agent in one-step synthesis of polyurethane (including pre polymers) synthesis. Used for curing diamine in the process of the polymers, glycol and polyols are also known as curing agent.

Water is a special chain extender agent and curing agent, water molecules of two hydrogen atoms with isocyanate, rather then difunctional chain extender. Moisture curing polyurethane adhesives and coatings curing reaction with moisture in the air.

Oligomer polyols, hydroxyl-terminated polyurethane reaction with diisocyanate, generated (end hydroxyl or end isocyanate) pre polymers or polyurethane elastic material, because of less dosage of diisocyanate, sometimes called diisocyanate as chain extender agent and curing agent. Three isocyanates are commonly used for two-component polyurethane coatings and polyurethane adhesive of crosslinking agent and curing agent.

Commonly used glycol chain extender agent and curing agent are 1, 4 - butanediol backwards diethylene glycol, ethylene glycol, and 1, 6 - diol, HQEE, etc. Commonly used polyols crosslinked agent with glycerin, trimethylolpropane, pentaerythritol and low molecular weight polyether polyol.




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).


Dihydroxy methyl propionate, dihydroxy methyl butyric acid and some homemade containing carboxyl glycol chain extender is a kind of contain hydrophilic groups, used in the preparation of waterborne polyurethane. Of double hydroxyethyl bisphenol A (bpa) is A kind of aromatic diol chain extension agent, under normal temperature is solid, relative molecular mass, 264, used for curing polyurethane elastomer, adhesives, etc.

Vibracure A125 is a kind of polyester glycol, used for polyurethane curing, in the process of the polymers with BDO in various mixing ratio, is used as the MDI polyester curing agent in the process of the polymers, the elastomer hardness can be obtained; It is mixed with MOCA as pre polymers TDI curing agent, can obtain a soft elastomer.

Vibracure A250 is a kind of glycol mixture, hydroxyl equivalent of 45.0, mainly used for curing PPDI pre polymers, than BDO easy to mix with pre polymers. The elastomer with high tensile strength and elongation, high tear strength, the resilient rate and dynamic mechanical properties. Vibracure A931 is a kind of glycol mixture, hydroxyl equivalent to 87.6. Curing of the elastomer hardness range shao A55 ~ 60, high tensile strength, elongation, tear strength and low compression set.

Many polyether manufacturers have relative molecular mass for hundreds of low molecular weight polyether polyol crosslinking agent supply, used for polyurethane foam system and "CASE" elastic polyurethane system.

A resistance low molecular weight aliphatic diamine mixture diamine, lower initial reactivity.

DAX 123 aromatic/aliphatic diamine mixture polyurea system of crosslinking agent. 13% of MDI pre polymers used in NCO content of curing. DAX 127 aromatic/aliphatic diamine mixture polyurea system of crosslinking agent. 15% of MDI pre polymers used in NCO content of curing.

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Diethyl toluene diamine(DETDA)  http://www.yaruichem.com