6 results about "Aminal" patented technology

A mixture of methylene diphenylamine isomers and polymethylene polyaniline is prepared with a controllable ratio of methylene diphenylamine isomers. Aniline and formaldehyde are reacted to produce N,N'-diphenylmethylenediamine (acetalamine), which is then partially rearranged in the presence of a heterogeneous catalyst to a mixture of aminobenzylaniline and methylene diphenylamine isomers. Further rearrangement is performed in the presence of a homogeneous catalyst to convert the remaining aminobenzylaniline isomers to methylene diphenylamine and polymethylene polyaniline.

A cyclic aminal – functional organosilicon compound and method for preparation thereof are provided. The cyclic aminal – functional organosilicon compound may be used as an additive in a curable siloxane composition.

A mixture of methylenedianiline isomers and polymethylenepolyaniline is produced at a controlled ratio of methylenedianiline isomers. Aniline and formaldehyde are reacted to produce N,N'-diphenylmethylene diamine (aldolamine), which is then partially rearranged in the presence of a Lewis acid-modified clay catalyst into a mixture of aminobenzylaniline isomers and methylenedianiline isomers. Further rearrangement is performed in the presence of a homogeneous catalyst to convert remaining aminobenzylaniline isomers to methylenedianiline and polymethylenepolyaniline.

The application provides a high-strength high-thermoplastic-temperature polysiloxane polyurea thermoplastic elastomer containing a dynamic acetal amine bond and a preparation method thereof. The application uses diisocyanate and macromolecular polydimethylsiloxane copolymer as a soft segment, diisocyanate and 1,3-bis(3-aminopropyl)tetramethyldisiloxane copolymer as a hard segment, and a polyhydroxy compound containing a dynamic acetal amine bond as a crosslinking agent, so that the prepared elastomer has good mechanical properties and a high thermoplastic temperature and can be repeatedly processed; the preparation process is simple and feasible, the product has stable performance and good reproducibility, and is suitable for popularization and application.

The application provides a preparation method of diphenylmethane series diamines and polyamines. In the preparation method of the diphenylmethane series diamines and polyamines, a solid acid catalyst with an acid amount greater than 1.3 mmol / g is used as a catalyst for an aminal transposition rearrangement reaction, the selectivity of the solid acid catalyst in the aminal transposition rearrangement reaction can be significantly improved, the content of tricyclic untransposed substances in the diphenylmethane series diamines and polyamines is reduced, and then high-quality diphenylmethane diisocyanate is obtained.

The invention relates to a production method for on-line regulation and control of MDA product composition and a production method of MDI. The production method comprises the following steps: formaldehyde and aniline are subjected to a synthesis reaction in a synthesis device to obtain an aminal reaction solution, the aminal reaction solution and hydrochloric acid are subjected to a condensation reaction in a condensation device to obtain a crude product, and the crude product is subjected to post-treatment to obtain an MDA product; wherein when the MDA product is used for preparing the MDI product, the mass ratio F of the bicyclic MDI in the MDI product meets the following relational expression; the mass fraction w of aniline in the crude product is detected on line, and the following relational expression is met, x is the molar ratio of formaldehyde to aniline during feeding, and y is the molar ratio of hydrochloric acid to aniline; ; in the production process, p2 is controlled to be equal to (0.98-1.02) p1, so that the proportion of bicyclic MDA in the MDA product can be controlled online in continuous production, and bicyclic MDI and polymerized MDI with an expected proportion can be obtained when the obtained MDA product is used for preparing MDI.