Polyurethane catalyst, preparation method thereof, polyurethane spraying rigid foam and polyurethane flexible foam

Abstract

The invention discloses a polyurethane catalyst, a preparation method of the polyurethane catalyst, polyurethane spraying rigid foam and polyurethane flexible foam. The structural formula of the polyurethane catalyst is shown in the specification, wherein R1 is selected from -NH2,-N(CH3)2 and-NHCH3; and R2 is selected from -NH2,-N(CH3)2 and -NHCH3. The polyurethane catalyst can be used to preparepolyurethane foam plastics, including reacting an organic polyisocyanate and a polyol in the presence of a blowing agent, a foam stabilizer, and the catalyst. The catalyst has a diethylenetriamine skeleton, has high catalytic activity and selectivity, and especially has a strong catalytic effect on the reaction of isocyanate and water.

Description

technical field [0001] The invention relates to the field of polyurethane, in particular to a polyurethane catalyst and polyurethane sprayed rigid foam and flexible foam. Background technique [0002] The polyurethane foam system mainly includes polyisocyanate, polyol, foaming agent, surfactant, crosslinking agent, catalyst, etc. Among them, the catalyst is mostly a tertiary amine catalyst, which has a certain catalytic effect on the foaming reaction (reaction of water and isocyanate to generate carbon dioxide) and gel reaction (reaction of polyol and isocyanate). [0003] At present, most of the bulk tertiary amine catalysts on the market are small molecule products that are easy to emit, have a nasty amine odor, and will continue to migrate out during the construction process or from the foam product, causing harm to human health, such as A1( Dipropylene glycol solution containing 70% wt of bis(dimethylaminoethyl) ether), A33 (dipropylene glycol solution containing 33% wt...

AI Technical Summary

Problems solved by technology

However, the reactive catalyst with active hydrogen groups will be linked to the polyurethane molecular chain during the polyurethane reaction process, which will reduce the molecular movement ability and increase the steric hindrance of the N atom of the tertiary amine, resulting in a gradual decline in the catalytic efficiency of the reactive catalyst. , so it is necessary to increase the amount of catalyst, so that the formulation cost will increase significantly

Furthermore, if the reaction-type catalyst is a molecule of a single active hydrogen group, it will also cause the chain termination of the polyurethane macromolecular segment, thereby affecting the physical properties of polyurethane products.

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