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Melamine hypophosphite modified lignin coated aluminum hypophosphite flame retardant as well as preparation method and application thereof in PA66 (polyamide 66)

A technology of melamine hypophosphite and aluminum hypophosphite coating is applied in the field of hypophosphorous acid modified lignin-coated aluminum hypophosphite flame retardant and its preparation, which can solve the problems of lowering tensile strength and mechanical properties, etc., so as to improve the surface The effect of good properties, compatibility and simple preparation process

Active Publication Date: 2022-03-18
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual use of aluminum hypophosphite, it is usually doped and blended in the form of additives, which leads to the improvement of the flame retardancy of the composite material but the reduction of mechanical properties, especially the significant decrease in tensile strength.

Method used

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  • Melamine hypophosphite modified lignin coated aluminum hypophosphite flame retardant as well as preparation method and application thereof in PA66 (polyamide 66)
  • Melamine hypophosphite modified lignin coated aluminum hypophosphite flame retardant as well as preparation method and application thereof in PA66 (polyamide 66)
  • Melamine hypophosphite modified lignin coated aluminum hypophosphite flame retardant as well as preparation method and application thereof in PA66 (polyamide 66)

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preparation example Construction

[0034] A preparation method of melamine hypophosphite modified lignin coated aluminum hypophosphite flame retardant comprises the following steps:

[0035] Wherein the structure of melamine hypophosphite modified lignin polymer is as follows:

[0036]

Embodiment 1

[0038]Weigh 0.2 g (0.005 mol) of sodium hydroxide in a beaker, add deionized water to make a sodium hydroxide solution with a concentration of 0.1 wt%, add 10 g of lignin into the sodium hydroxide solution, and make the lignin completely dissolved. Weigh 6.3 g (0.05 mol) of melamine and add it into deionized water to form a white turbid solution. Pour the white turbid solution into a three-necked flask equipped with a magnetic stirrer and a reflux condenser. Raise it to 70 °C, add 0.025 mol of formaldehyde after the temperature is stable, and slowly drop the lignin alkali solution into the three-necked flask with a separatory funnel, and continue the heat preservation reaction for 1 h. Weigh 8.8 g (0.1 mol) of sodium hypophosphite and 9.9 g (0.015 mol) of aluminum sulfate octadecahydrate, and prepare 100 ml of salt solution with deionized water. Use a separatory funnel to slowly drop the aluminum sulfate eighteen water solution into the three-necked flask, then drop the sodiu...

Embodiment 2

[0040] Weigh 0.56 g (0.01 mol) of potassium hydroxide into a beaker, add deionized water to make a potassium hydroxide solution with a concentration of 0.2 wt%, add 15 g of lignin into the potassium hydroxide solution, and make the lignin completely dissolved. Weigh 31.5 g (0.25 mol) of melamine and add it into deionized water to form a white turbid solution. Pour the white turbid solution into a three-necked flask equipped with a magnetic stirrer and a reflux condenser. Raise to 80 °C, add 0.1 mol of acetaldehyde after the temperature stabilizes, slowly drop lignin alkali solution into the three-necked flask with a separatory funnel, and continue to keep warm for 2 h. Weigh 13.2 g (0.15 mol) of sodium hypophosphite and 9.4 g (0.025 mol) of aluminum nitrate nonahydrate, and prepare 200 ml of salt solution with deionized water. Use a separating funnel to slowly drop the aluminum nitrate nonahydrate solution into the three-necked flask, then drop the sodium hypophosphite soluti...

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Abstract

The invention discloses a melamine hypophosphite modified lignin coated aluminum hypophosphite flame retardant as well as a preparation method and application thereof. According to the preparation method, lignin, melamine, aldehyde, hypophosphorous acid, sodium hypophosphite and soluble aluminum salt are taken as raw materials, an amine methylation reaction, a phosphoramidation reaction and a chemical coprecipitation method are combined, a melamine modified lignin polymer is taken as a capsule wall material, in-situ generated aluminum hypophosphite is taken as a core material, and the composite material is prepared. The aluminum hypophosphite flame retardant modified by the melamine hypophosphite and coated by the lignin is prepared. The flame retardant prepared by the preparation method disclosed by the invention is wide in raw material source, simple in synthesis process and good in thermal stability, the capsule wall material melamine hypophosphite modified lignin in the flame retardant is good in compatibility with a high polymer material, and the influence of the flame retardant on the mechanical property of PA66 can be reduced; and the capsule material melamine hypophosphite modified lignin and the core material aluminum hypophosphite have a remarkable flame-retardant synergistic effect, so that the flame-retardant material has very high flame-retardant efficiency when being used in PA66, and molten drops of PA66 can be effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of bio-based polymer flame retardant, and specifically relates to a hypophosphorous acid-modified lignin-coated aluminum hypophosphite flame retardant, a preparation method thereof, and an application in PA66. Background technique [0002] PA66 is one of the most productive and widely used varieties of nylon series products. It is widely used in various industrial fields, and its total output ranks first in the world's engineering plastics. PA66 is usually used in key fire prevention parts, but its limiting oxygen index is only 24%, and UL-94 is V-2 level, so the flame retardant performance of pure PA66 is far from meeting the requirements of practical applications. However, PA66 is not only extremely flammable but also produces a large amount of molten droplets during the combustion process, which poses a great safety hazard and limits its application in the fields of electronic appliances, electric vehicle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K3/32C08L77/06
CPCC08K9/10C08K3/32C08L2201/02C08L77/06
Inventor 熊雷唐伟钟刘家宇靳艳巧黄泽杰
Owner FUZHOU UNIV
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