Method for preparing flame-retardant polypropylene by in-situ coating of modified ammonium polyphosphate

A technology for coating ammonium polyphosphate and flame retardant polypropylene, which is applied in the field of flame retardant materials, can solve the problems of cumbersome preparation process, reduced water absorption, flammability, etc., and achieves simple preparation process, improved flame retardant effect, and improved flame retardant. performance effect

Pending Publication Date: 2020-09-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN1480253A discloses a kind of preparation method with ammonium polyphosphate as core material and microcapsule-coated ammonium polyphosphate as coating material with melamine-formaldehyde resin, but in the reaction process, APP is partially hydrolyzed to make its utilization rate lower Low, the yield of the resulting coated product is low
Chinese patent CN101760049A discloses a preparation method of core-shell silica-coated ammonium polyphosphate, which is environmentally friendly and pollution-free, and the flame retardancy of the obtained product is good, but the preparation process is too cumbersome
Chinese patent CN101537331A discloses a method for preparing epoxy resin-coated ammonium polyphosphate flame retardant microcapsules. This solution effectively reduces the water absorption of APP and improves the dispersibility of APP. The curing reaction of the resin is not complete enough
[0004] Polypropylene resin (PP) is a material with excellent performance and a wide range of uses, but it has shortcomings such as flammability and burning dripping. It is usually modified by adding a halogen-containing flame retardant to improve its flame retardant performance

Method used

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  • Method for preparing flame-retardant polypropylene by in-situ coating of modified ammonium polyphosphate
  • Method for preparing flame-retardant polypropylene by in-situ coating of modified ammonium polyphosphate
  • Method for preparing flame-retardant polypropylene by in-situ coating of modified ammonium polyphosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 140mL of absolute ethanol into the reaction kettle at room temperature, then add 14g of bisphenol A epoxy resin and 2g of triethylenetetramine, and stir to disperse evenly. Continue to add 60 g of dried ammonium polyphosphate and 0.6 g of dried montmorillonite to the mixture, and stir again for 30 min. Then the mixture was heated to 40° C., stirred at this temperature for 1 h, continued to be heated to 70° C., and reacted at this temperature for 1 h. After the reaction, filter with suction, wash the filter cake fully with distilled water, collect the product and transfer it to a vacuum drying oven, and dry it at 80°C for 48 hours to obtain epoxy resin-coated ammonium polyphosphate microcapsules.

[0025] Mix 20g of dried epoxy resin-coated ammonium polyphosphate microcapsules with 10g of pentaerythritol phosphate for compounding, and put the obtained intumescent flame retardant into a mixer together with 70g of polypropylene, and heat it at 180°C and 50r / min Knead ...

Embodiment 2

[0029] Add 140mL of absolute ethanol into the reaction kettle at room temperature, then add 14g of bisphenol A epoxy resin and 2g of triethylenetetramine, and stir to disperse evenly. Continue to add 60 g of dried ammonium polyphosphate and 0.6 g of dried montmorillonite to the mixture, and stir again for 30 min. Then the mixture was heated to 40° C., stirred at this temperature for 1 h, continued to be heated to 70° C., and reacted at this temperature for 1 h. After the reaction, filter with suction, wash the filter cake fully with distilled water, collect the product and transfer it to a vacuum drying oven, and dry it at 80°C for 48 hours to obtain epoxy resin-coated ammonium polyphosphate microcapsules.

[0030]Mix 22.5g of dried epoxy resin-coated ammonium polyphosphate microcapsules with 7.5g of pentaerythritol phosphate for compounding. The resulting intumescent flame retardant is put into a mixer together with 70g of polypropylene, and mixed at 180°C and 50r / min speed...

Embodiment 3

[0033] Add 140mL of absolute ethanol into the reaction kettle at room temperature, then add 14g of bisphenol A epoxy resin and 2g of triethylenetetramine, and stir to disperse evenly. Continue to add 60 g of dried ammonium polyphosphate and 0.6 g of dried montmorillonite to the mixture, and stir again for 30 min. Then the mixture was heated to 40° C., stirred at this temperature for 1 h, continued to be heated to 70° C., and reacted at this temperature for 1 h. After the reaction, filter with suction, wash the filter cake fully with distilled water, collect the product and transfer it to a vacuum drying oven, and dry it at 80°C for 48 hours to obtain epoxy resin-coated ammonium polyphosphate microcapsules.

[0034] Mix 24g of dried epoxy resin-coated ammonium polyphosphate microcapsules with 6g of pentaerythritol phosphate for compounding. The obtained intumescent flame retardant is put into a mixer together with 70g of polypropylene, and mixed at 180°C and 50r / min Knead for ...

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Abstract

The invention relates to a method for preparing flame-retardant polypropylene by in-situ coating of modified ammonium polyphosphate. The method comprises the following steps: taking epoxy resin as a wall material and ammonium polyphosphate as a core material; carrying out in-situ polymerization in a step heating mode to obtain epoxy resin coated ammonium polyphosphate microcapsules, compounding the epoxy resin coated ammonium polyphosphate microcapsules with pentaerythritol and other carbon sources to obtain an intumescent flame retardant, and finally mixing and molding polypropylene and the flame retardant to obtain the flame-retardant polypropylene product with excellent properties. Experiments show that the prepared ammonium polyphosphate microcapsules are more completely cured, the flame retardant property and charring performance of the final polypropylene product are greatly improved, and the dripping phenomenon is prevented.

Description

technical field [0001] The invention relates to the technical field of flame-retardant materials, in particular to a method for preparing flame-retardant polypropylene composite materials by in-situ coating modified ammonium polyphosphate. Background technique [0002] Intumescent flame retardants (IFRs) are favored for their environmental friendliness and high efficiency. IFR undergoes a series of chemical reactions (such as esterification, carbonization, expansion, and solidification) to form an expanded char layer, which can act as a barrier to protect the internal materials from thermal damage and slow mass transfer. Compared with traditional halogen flame retardants, intumescent flame retardants with ammonium polyphosphate (APP) as the main component have the advantages of no halogen, low smoke, and low toxicity. Due to its chemical structure, ammonium polyphosphate has strong hygroscopicity and is easy to agglomerate, and has poor compatibility with polymer materials....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K13/06C08K9/10C08K3/32C08K5/521B01J13/14
CPCB01J13/14C08K3/32C08K5/521C08K9/10C08K13/06C08K2003/323C08L2201/02C08L23/12
Inventor 梅启林巫炼罗成倪圣刘惠智沈南柱肖晗
Owner WUHAN UNIV OF TECH
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