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Flame-retardant composite material and preparation method thereof

A kind of flame retardant composite material and composite material technology, applied in the field of flame retardant composite material and its preparation, can solve the problems of poor compatibility, reduce the flame retardant and mechanical properties of composite materials, and achieve improved interface adhesion and excellent melting resistance The effect of excellent drop performance and mechanical properties

Active Publication Date: 2021-06-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And ammonium polyphosphate will reduce the flame retardancy and mechanical properties of the composite material due to its poor compatibility with the polymer matrix.

Method used

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  • Flame-retardant composite material and preparation method thereof
  • Flame-retardant composite material and preparation method thereof

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Embodiment 1

[0040] This embodiment prepares imidazolium cationic polyurethane microencapsulated ammonium polyphosphate / polycaprolactone / polylactic acid flame-retardant composite material according to the following steps:

[0041] The method for preparing polyurethane microencapsulated ammonium polyphosphate is characterized in that it comprises the following steps:

[0042] 1) Under nitrogen protection, successively dissolve N,N-neopentyl glycol p-(N-methylimidazolium) bromide salt and polycaprolactone diol in dimethyl sulfoxide solvent, and add them to the reaction flask , and then add IPDI, N, N-neopentyl glycol to (N-methylimidazolium) bromide salt and the hydroxyl group of polycaprolactone diol: the molar ratio of the isocyanate group of IPDI is 1:0.95. The catalyst DBTDL was added dropwise, and the polymerization reaction was carried out at 150°C for 2 hours. As the reaction progressed, the melt viscosity continued to increase, and 4 ml of solvent was added appropriately to prevent g...

Embodiment 2

[0048] This embodiment prepares imidazolium cationic polyurethane microencapsulated ammonium polyphosphate / polycaprolactone / polylactic acid flame-retardant composite material according to the following steps:

[0049] 1) Under nitrogen protection, successively dissolve N,N-neopentyl glycol p-(N-methylimidazolium) bromide salt and polycaprolactone diol in dimethyl sulfoxide solvent, and add them to the reaction flask , Then add TDI, N, N-neopentyl glycol to (N-methylimidazolium) bromide salt and polycaprolactone diol hydroxyl:TDI isocyanate molar ratio is 1:0.95. The catalyst DBTDL was added dropwise, and the polymerization reaction was carried out at 150°C for 3 hours. As the reaction progressed, the melt viscosity continued to increase, and 4 ml of solvent was added appropriately to prevent gelation.

[0050] 2) adding an aqueous solution of sodium p-toluenesulfonate to carry out ion exchange reaction with imidazolium cationic polyurethane, and reacting at 80° C. for 4 hours....

Embodiment 3

[0055] This embodiment prepares imidazolium cationic polyurethane microencapsulated ammonium polyphosphate / polycaprolactone / polylactic acid flame-retardant composite material according to the following steps:

[0056] 1) Under nitrogen protection, successively dissolve N,N-neopentyl glycol p-(N-methylimidazolium) bromide salt and polycaprolactone diol in dimethyl sulfoxide solvent, and add them to the reaction flask , and then add MDI, N, N-neopentyl glycol to (N-methylimidazolium) bromide salt and the hydroxyl group of polycaprolactone diol: the molar ratio of the isocyanate group of MDI is 1:0.95. The catalyst DBTDL was added dropwise, and the polymerization reaction was carried out at 150°C for 2 hours. As the reaction progressed, the melt viscosity continued to increase, and 4 ml of solvent was added appropriately to prevent gelation.

[0057] 2) adding an aqueous solution of sodium p-toluenesulfonate to carry out ion exchange reaction with imidazolium cationic polyurethan...

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Abstract

The invention provides an imidazole cation polyurethane microencapsulated ammonium polyphosphate / polycaprolactone / polylactic acid flame-retardant composite material and a preparation method thereof. The imidazole cationic polyurethane microencapsulated ammonium polyphosphate is prepared by the following steps: reacting N, N-neopentyl glycol p-(N-methylimidazole) bromine salt, polycaprolactone diol and diisocyanate in dimethyl sulfoxide to generate hydroxyl-terminated polyurethane, adding a sodium sulfonate solution, and carrying out ion exchange, finally, adding ammonium polyphosphate and an emulsifier for emulsification, and preparing the imidazole cationic polyurethane microencapsulated ammonium polyphosphate. According to the invention, the polyurethane microencapsulated ammonium polyphosphate can improve the dispersibility of ammonium polyphosphate and the compatibility of ammonium polyphosphate with a matrix, and the imidazole sulfonic acid ion catalytic element, the auxiliary flame retardant, the antioxidant and the charring agent jointly improve the flame retardant property of the composite material. Meanwhile, the product is environment-friendly and safe and has a wide application prospect.

Description

technical field [0001] The invention relates to an imidazolium cationic polyurethane microencapsulated ammonium polyphosphate / polycaprolactone / polylactic acid flame-retardant composite material and a preparation method thereof. Background technique [0002] As a new type of biodegradable material, polylactic acid is made from renewable raw materials such as starch, and is known as "green plastic" and "environmentally friendly polymer material". Due to the advantages of high strength, high modulus and good biocompatibility, polylactic acid has been widely used in biomedicine, automobiles, electronics and electrical fields. However, polylactic acid is a flammable polymer, and its limiting oxygen index is only about 20, especially when it is burned, it is accompanied by severe melting and dripping, which greatly limits the further application of polylactic acid. Therefore, flame retardant PLA must be developed to expand its practical industrial application. [0003] Imidazoli...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L3/02C08L97/00C08K9/10C08K3/32C08K5/29C08K13/06C08K3/22C08K3/34C08K5/3492C08K5/053C08K5/19
CPCC08L67/04C08L2201/02C08K2003/323C08L2205/025C08L2205/03C08L3/02C08L97/005C08K9/10C08K3/32C08K5/29C08K13/06C08K3/2279C08K3/346C08K5/34922C08K5/053C08K5/19Y02P20/54
Inventor 徐佩严彤王平孙晓红丁运生陈寒阳黄彬城
Owner HEFEI UNIV OF TECH
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