Method for preparing polyamideimide fibrid
US9469730B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2014 |
| Grant date | Oct 18, 2016 |
| Priority date | — |
| Expiry date | Apr 16, 2034 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H13/26
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention provides a method for preparing a polyamideimide fibrid, characterized by comprising the following specific steps: step 1: reacting diamine monomer with trimellitic anhydride chloride in an aprotic polar solvent in the presence of a catalyst to obtain a polyamide acid polymer, and carrying out chemical cyclization dehydration on the polyamide acid polymer to obtain a polyamideimide polymer solution; step 2: diluting the polyamideimide polymer solution, adding the diluted polyamideimide polymer solution and precipitation solution to a precipitation machine, and mixing to obtain a polyamideimide fibrid suspension; and step 3: washing, filtering and drying the polyamideimide fibrid suspension to obtain a polyamideimide fibrid. The invention is characterized by simple process, the size and shape of the fibrid are easy to be controlled, and the fibrid can be directly used to prepare high performance paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.