Title:
CRYSTALLINE ALUMINUM PHOSPHITE, PREPARATION METHOD THEREFOR, AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2022/083032
Kind Code:
A1
Abstract:
A crystalline aluminum phosphite, a preparation method therefor, and the use thereof for preparing a flame retardant or a flame retardant synergist. The process flow of the preparation method therefor involves: 1. reacting aluminum hydrogen phosphite with an aluminum-containing compound at a certain ratio in water at 80-110ºC in the presence of a small amount of concentrated phosphoric acid to obtain a precipitate; 2. washing and filtering the precipitate; 3. drying the precipitate at 100-130ºC until no water remains; and 4. continuing to heat the solid, from which water has been dried, in such a slow-rate stepwise ramp manner in which the temperature of the material is raised from room temperature to a temperature of no more than 350ºC within approximately 5-10 hours at a thermal ramp rate of no more than 5ºC/min. Compared with amorphous ammonium phosphite, the crystalline aluminum phosphite has a relatively high thermal decomposition temperature, a relatively low hydroscopicity, and a relatively weak acidity, can function synergistically with aluminum diethyl hypophosphite, has a relatively good flame retardance, and is used as a halogen-free flame-retardant component in a high molecular material.
Inventors:
LEI HUA (CN)
LI JINZHONG (CN)
LI JINZHONG (CN)
Application Number:
PCT/CN2021/075180
Publication Date:
April 28, 2022
Filing Date:
February 04, 2021
Export Citation:
Assignee:
JIANGSU LISIDE NEW MAT CO LTD (CN)
UNIV ZHEJIANG (CN)
UNIV ZHEJIANG (CN)
International Classes:
C01B25/163
Domestic Patent References:
| WO2018234429A1 | 2018-12-27 | |||
| WO2013083248A1 | 2013-06-13 |
Foreign References:
| CN111661830A | 2020-09-15 | |||
| CN103101893A | 2013-05-15 | |||
| CN107082409A | 2017-08-22 | |||
| CN111201197A | 2020-05-26 | |||
| CN101804973A | 2010-08-18 | |||
| CN104114485A | 2014-10-22 | |||
| JPH0489306A | 1992-03-23 | |||
| JP2010111739A | 2010-05-20 |
Attorney, Agent or Firm:
HANGZHOU TIANQIN INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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