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Flame-retardant nano cellulose containing phosphazene group, preparation method and flame-retardant polylactic acid of flame-retardant nano cellulose

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

Active Publication Date: 2021-10-29
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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  • Flame-retardant nano cellulose containing phosphazene group, preparation method and flame-retardant polylactic acid of flame-retardant nano cellulose
  • Flame-retardant nano cellulose containing phosphazene group, preparation method and flame-retardant polylactic acid of flame-retardant nano cellulose
  • Flame-retardant nano cellulose containing phosphazene group, preparation method and flame-retardant polylactic acid of flame-retardant nano cellulose

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0033] Step (2): Slowly add the hydrolyzed phosphazene modifier obtained in step (1) dropwise to the mixed solution of 9.40g cellulose nanofibers (CNF) and 90ml cyclohexane;

[0034] Step (3): after the dropwise addition, heat up to 40°C, and stir and reflux for 10 hours;

[0035] Step (4): The mixture obtained in step (3) is left to cool, and after the solid is completely precipitated, it is sucked and filtered, and vacuum-dried to obtain flame-retardant nanocellulose containing phosphazene groups;

[0036] Step (5): The above-mentioned flame-retardant nanocellulose and piperazine pyrophosphate (PPAP) are pre-mixed in a mass ratio of 1:10 to make a compound flame retardant, and then take 5 parts of the compound flame retardant and 95 Parts of polylactic acid were added to th...

Embodiment 2

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

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

[0041] Step (3): After the dropwise addition, heat up to 20°C, and stir and reflux for 18 hours;

[0042] Step (4): The mixture obtained in step (3) is left to cool, and after the solid is completely precipitated, it is sucked and filtered, and vacuum-dried to obtain flame-retardant nanocellulose containing phosphazene groups;

[0043] Step (5): The above-mentioned flame-retardant nanocellulose and melamine polyphosphate (MPP) are pre-mixed in a mass ratio of 10:1 to make a compound flame retardant, and then take 20 parts of the compound flame retardant and 80 Parts of polylactic acid were added to the torque r...

Embodiment 3

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

[0047] Step (2): Slowly add the hydrolyzed phosphazene modifier obtained in step (1) dropwise to the mixed solution of 8.2g cellulose nanocrystals (CNC) and 100ml absolute ethanol;

[0048] Step (3): after the dropwise addition, heat up to 80°C, and stir and reflux for 12 hours;

[0049]Step (4): The mixture obtained in step (7) is left to cool, and after the solid is completely precipitated, it is suction filtered and vacuum-dried to obtain flame-retardant nanocellulose (M-CNC) containing phosphazene groups;

[0050] Step (5): Pre-mix M-CNC and ammonium polyphosphate (APP) at a mass ratio of 3:7 to make a compound flame retardant, then take 10 parts of the compound flame retardant and 90 parts of polylactic acid together Add to the torque rheometer, melt blending at 180 ° ...

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Abstract

The invention discloses flame-retardant nano cellulose containing a phosphazene group, a preparation method of the flame-retardant nano cellulose and flame-retardant polylactic acid of the flame-retardant nano cellulose. A phosphazene modifier is chemically grafted on the surface of nanocellulose to obtain the novel flame-retardant nanocellulose containing the phosphazene group. The flame-retardant nano cellulose obtained by the invention has excellent thermal stability and charring ability. The flame-retardant polylactic acid is compounded with a phosphorus-containing flame retardant, so that the flame retardant property of the material can be remarkably improved, and the mechanical property of the material can also be improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano-flame retardants and flame-retardant modification of polymer materials, and specifically relates to 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, Textile and food packaging and other fields. However, PLA is flammable and accompanied by severe dripping, which limits its application in fields such as electronic appliances and automobiles that require high flame retardancy. Therefore, the development of flame-retardant PLA composite materials has become an inevitable choice. ...

Claims

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Application Information

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Patent Type & Authority Applications(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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