Lignin inrumescent flame retardant preparation method

An intumescent flame retardant, lignin-based technology, applied in the field of flame retardant, can solve the problems of environmental pollution, resource waste, etc., and achieve thermal stability, good char formation, high char formation rate, and strong flame retardant effect Effect

Active Publication Date: 2018-08-24
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, more than 95% of the isolated lignin is concentrated and burned or discharged into rivers, which not only causes a great waste of resources, but also pollutes the environment

Method used

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  • Lignin inrumescent flame retardant preparation method
  • Lignin inrumescent flame retardant preparation method
  • Lignin inrumescent flame retardant preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put 8.07g of alkali lignin into a 500ml three-necked bottle and add 80g of deionized water, pass through the condensed water, stir, raise the temperature to 70°C, add 12.906g of melamine into the system, stir for 10min; The formaldehyde solution (37wt%) was slowly added dropwise into the three-necked flask for 1 hour, and the temperature was maintained for 6 hours of reaction. After the reaction, add 20.88g phytic acid solution (50wt%) into the there-necked flask, filter, wash the filter residue with deionized water 3 times, then dry the filter residue and place it in a vacuum oven at 80°C for 24h. Grinding and pulverizing the product, and then putting the product into a ball mill for 24 hours to finally obtain an intumescent flame retardant containing phosphorus and nitrogen elements.

Embodiment 2

[0038] Put 16.14 alkali lignin into a 500ml three-necked bottle and add 160g deionized water, pass condensed water, stir, heat up to 70°C, add 25.818g melamine into the system, stir for 10min; heat up to 90°C, add 26.16g formaldehyde The solution (37wt%) was slowly added dropwise into the three-necked flask for 2 hours, and the temperature was maintained for 7 hours. After the reaction, add 83.52g phytic acid solution (50wt%) into the there-necked flask, filter, wash the filter residue three times with deionized water, then dry the filter residue, and place it in a vacuum oven at 80°C for 24h. Grinding and pulverizing the product, and then putting the product into a ball mill for 36 hours to finally obtain an intumescent flame retardant containing phosphorus and nitrogen elements.

Embodiment 3

[0040] Put 8.07g of alkali lignin into the three-necked flask and add 80g of deionized water, pass through the condensed water, stir, stir, raise the temperature to 70°C, add 12.906g of melamine into the system, stir for 10min; raise the temperature to 90°C, put 13.08g The formaldehyde solution (37wt%) was slowly added dropwise into the three-necked flask for 1 hour, and the temperature was maintained for 6 hours of reaction. After the reaction, add 41.76g phytic acid solution (50wt%) into the there-necked flask, filter, wash the filter residue with deionized water 3 times, then dry the filter residue, and place it in a vacuum oven at 80°C for 24h. Grinding and pulverizing the product, and then putting the product into a ball mill for 24 hours to finally obtain an intumescent flame retardant containing phosphorus and nitrogen elements.

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Abstract

The invention discloses a lignin inrumescent flame retardant preparation method. The alkali lignin is placed in enough water, heating is carried out, melamine is added, stirring and heating are carried out, a formaldehyde solution is added drop by drop for a reaction, a phytic acid solution is added drop by drop in proportion, the product is placed in a centrifuge for centrifugal operation, whiteprecipitate is removed, and residual liquid is dried in a vacuum drying box until the product mass is not changed. While a fire retardant combusts, heavy smoke as well as poisonous and harmful gas having excitant smell are not generated, environment is friendly, the materials for synthesis of the fire retardant are renewable resources, the raw materials are easily available and easy to process, and no burden is generated on environment.

Description

technical field [0001] The invention belongs to a method for preparing a flame retardant in the technical field of flame retardancy, and in particular relates to a method for preparing a lignin-based intumescent flame retardant. Background technique [0002] With the development of science and technology, low-cost, high-performance and environmentally friendly petroleum-based polymers have attracted people's attention. Due to the bleak prospects of the polymer industry of non-renewable resources such as petroleum in the context of excessive consumption of global resources and continuous deterioration of the environment, people are turning their attention to renewable resources. For example, the raw materials for preparing bio-based plastics such as polylactic acid and polybutylene succinate are derived from crops such as corn and sugar beets, and they have high strength, high transparency, easy processing and good biodegradability, compatibility And other excellent properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/40C08G12/32
CPCC08G12/32C08G12/40
Inventor 宋平安戴进峰刘丽娜俞友明
Owner ZHEJIANG FORESTRY UNIVERSITY
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