Alkyl Hypophosphorous Acid-Based Flame Retardant Having Controlled Particle Size, And Method For Manufacturing Same
AssigneeUniversal Chemtech Co., Ltd.
InventorsSe-saeng OH, Jae-seung CHA, Seon-hee JE, Se-young YUN
Life of this patent
Estimating the term…
Abstract
The present invention relates to a hypophosphorous acid-based flame retardant and a method for manufacturing same, the method for manufacturing a hypophosphorous acid-based flame retardant having a controlled particle size due to divalent to tetravalent metal salt supplied through a nozzle. The hypophosphorous acid-based flame retardant having a controlled particle size according to the present invention can provide excellent flame retardancy to adhesive compositions requiring thinness without harming the physical properties of a product or flame retardant compositions requiring heat resistance.
Claims15
A hypophosphorous acid-based flame retardant satisfying the following Expressions 1 and 2 and represented by the following Chemical Formula 1:
- 0.1
- <
- D
- 50
- /
- (
- D
- 98
- -
- D
- 50
- )
- <
- 0.6
- [
- Expression
-
- 1
- ]
- 250
-
- °
-
- C
- .
- <
- T
- CG
- <
- 320
-
- °
-
- C
- .
- [
- Expression
-
- 2
- ]
- (in Expression 1, when measured by a laser diffraction scattering method, D50 is a particle diameter corresponding to 50% of a cumulative volume of a particle size distribution, and D98 is a particle diameter corresponding to 98% of the cumulative volume of the particle size distribution,
- in Expression 2, TCG represents a temperature at which a weight loss of 1.0% appears first under thermogravimetric analysis conditions of a heating rate of 10° C./min and a nitrogen flow rate of 20 ml/min, and
- in Chemical Formula 1, R1 and R2 are hydrogen or linear or branched (C1-C6)alkyl independently of each other, M is a metal atom of Ca, Mg, Al, Zn, or Ti, and n represents an integer selected from 2 to 4).
A method for manufacturing a hypophosphorous acid-based flame retardant, the method comprising:
- a) preparing a metal alkyl hypophosphite by stirring an alkali metal hypophosphite, (C2-C4)alkene, a radical initiator, and water;
- b) preparing a hypophosphorous acid-based metal salt by reacting the metal alkyl hypophosphite prepared in step a) with a divalent to tetravalent metal salt;
- c) washing the hypophosphorous acid-based metal salt prepared in step b) with distilled water;
- and
- d) drying the hypophosphorous acid-based metal salt washed with water in step c) under vacuum conditions to manufacture a hypophosphorous acid-based flame retardant represented by the following Chemical Formula 1,
- wherein in step b), at least one raw material of the metal alkyl hypophosphite and the divalent to tetravalent metal salt is supplied through a nozzle:
- (in Chemical Formula 1, R1 and R2 are hydrogen or linear or branched (C1-C6)alkyl independently of each other, M is a metal atom of Ca, Mg, Al, Zn, or Ti, and n represents an integer selected from 2 to 4).
Dependencies are inferred from the claim text.