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A kind of flame-retardant nanocellulose containing phosphazene group, preparation method and flame-retardant polylactic acid thereof

A technology of nanocellulose and nitrile group, applied in the field of flame retardant nanocellulose, preparation, and flame retardant polylactic acid, can solve the problems of low thermal stability, high raw material cost, low flame retardant efficiency, etc., and achieve flame retardant efficiency High, initial decomposition temperature, the effect of improving carbon formation rate and flame retardant performance

Active Publication Date: 2022-07-05
杭州志合新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, natural nanocellulose and most of its derivatives have low thermal stability, and when used alone for flame-retardant polylactic acid, the cost of raw materials is high and the flame-retardant efficiency is low

Method used

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  • A kind of flame-retardant nanocellulose containing phosphazene group, preparation method and flame-retardant polylactic acid thereof
  • A kind of flame-retardant nanocellulose containing phosphazene group, preparation method and flame-retardant polylactic acid thereof
  • A kind of flame-retardant nanocellulose containing phosphazene group, preparation method and flame-retardant polylactic acid thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step (1): adding 9.40 g of phosphazene modifier to a mixed solution of 50 ml of water and 50 ml of absolute ethanol, and ultrasonicating for 30 minutes at 10° C. to obtain a hydrolyzed phosphazene modifier;

[0033] Step (2): slowly drop the hydrolyzed phosphazene modifier obtained in step (1) into a mixture of 9.40g of cellulose nanofibers (CNF) and 90ml of cyclohexane;

[0034] Step (3): after the dropwise addition is completed, the temperature is heated to 40° C., and the reaction is stirred and refluxed for 10 hours;

[0035] Step (4): the mixture obtained in step (3) is allowed to stand for cooling, after the solid is completely separated out, suction filtration, and vacuum drying to obtain flame-retardant nanocellulose containing phosphazene groups;

[0036] Step (5): premix the above-mentioned flame retardant nanocellulose and piperazine pyrophosphate (PPAP) in a mass ratio of 1:10 to prepare a compound flame retardant, and then take 5 parts of the compound flame...

Embodiment 2

[0039] Step (1): adding 44.5 g of phosphazene modifier to a mixed solution of 10 ml of water and 100 ml of absolute ethanol, and ultrasonicating for 5 minutes at 40° C. to obtain a hydrolyzed phosphazene modifier;

[0040] Step (2): slowly add the hydrolyzed phosphazene modifier obtained in step (1) dropwise to a mixture of 8.9 g of cellulose nanocrystals (CNC) and 50 ml of toluene;

[0041] Step (3): after the dropwise addition is completed, the temperature is heated to 20° C., and the reaction is stirred and refluxed for 18 hours;

[0042] Step (4): the mixture obtained in step (3) is allowed to stand for cooling, after the solid is completely separated out, suction filtration, and vacuum drying to obtain flame-retardant nanocellulose containing phosphazene groups;

[0043] Step (5): premix the above flame retardant nanocellulose and melamine polyphosphate (MPP) in a mass ratio of 10:1 to prepare a compound flame retardant, and then take 20 parts of the compound flame retard...

Embodiment 3

[0046] Step (1): adding 20.5 g of phosphazene modifier to a mixed solution of 15 ml of water and 75 ml of absolute ethanol, and ultrasonicating for 15 minutes at 20° C. to obtain a hydrolyzed phosphazene modifier;

[0047] Step (2): slowly drop the hydrolyzed phosphazene modifier obtained in step (1) into a mixture of 8.2 g of cellulose nanocrystals (CNC) and 100 ml of absolute ethanol;

[0048] Step (3): after the dropwise addition is completed, the temperature is heated to 80° C., and the reaction is stirred and refluxed for 12 hours;

[0049]Step (4): the mixture obtained in step (7) is allowed to stand for cooling, and after the solid is completely separated out, suction filtration, and vacuum drying to obtain flame-retardant nanocellulose (M-CNC) containing phosphazene groups;

[0050] Step (5): M-CNC and ammonium polyphosphate (APP) are pre-mixed in a mass ratio of 3:7 to make a compound flame retardant, and then 10 parts of the compound flame retardant and 90 parts of p...

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Abstract

The invention discloses a flame-retardant nanocellulose containing a phosphazene group, a preparation method and a flame-retardant polylactic acid thereof. The phosphazene modifier was chemically grafted on the surface of nanocellulose to obtain a novel flame-retardant nanocellulose containing phosphazene groups. The flame-retardant nanocellulose obtained by the invention has excellent thermal stability and carbon-forming ability. Combining it with a phosphorus-containing flame retardant to compound flame retardant polylactic acid can not only significantly improve the flame retardant properties of the material, but also improve its mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano flame retardants and flame retardant modification of polymer materials, in particular to a flame retardant nano cellulose containing phosphazene groups, a preparation method and flame retardant polylactic acid thereof. Background technique [0002] Polylactic acid (PLA) is a degradable thermoplastic polymer obtained from renewable resources such as corn starch. It has the advantages of low toxicity and environmental friendliness. It is expected to replace non-degradable traditional petroleum-based raw materials and has been widely used in medical, Textiles and food packaging and other fields. However, PLA is flammable and accompanied by severe dripping, which limits its application in electronic appliances, automobiles and other fields that require high flame retardant properties. Therefore, the development of flame-retardant PLA composites has become an inevitable choice. [0003] W...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B15/06C08L67/04C08L1/04C08L1/02
CPCC08B15/06C08L67/04C08L2201/02C08L2201/22C08L2201/08C08L1/04C08L1/02Y02W90/10
Inventor 杨春壮邵水玉
Owner 杭州志合新材料有限公司
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