A preparation method of dopamine surface functionalized expandable graphite flame retardant epoxy resin

A technology of epoxy resin preparation and surface functionalization, applied in the field of flame retardant preparation and polymer material modification, can solve problems such as poor interface compatibility and uneven dispersion, and achieve improved dispersion, strong controllability, The effect of ideal interface combination

Active Publication Date: 2022-04-29
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The active functional groups in the PDA layer are chemically bonded to the epoxy groups to form an interfacial bond, thereby "integrating" the flame retardant with the matrix, improving the uneven dispersion and poor interface compatibility of EG, and improving its flame retardancy efficiency

Method used

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  • A preparation method of dopamine surface functionalized expandable graphite flame retardant epoxy resin
  • A preparation method of dopamine surface functionalized expandable graphite flame retardant epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of epoxy resin

[0032] a Weigh 187.5g of epoxy resin and add it to a beaker, and stir for 10min at a speed of 500r / min in a constant temperature water bath at 60°C;

[0033] b Take by weighing 62.5g curing agent and join in above-mentioned epoxy resin, continue to stir 10min at room temperature, then put into vacuum oven and carry out vacuum defoaming treatment, carry out injection molding after defoaming finishes;

[0034] c Pre-cure the injected mold at room temperature for 12 hours. After the pre-curing is completed, put it into an electric blast drying oven with a temperature set at 120°C for high-temperature curing for 4 hours. After the high-temperature curing is completed, cool to room temperature to obtain epoxy resin (EP) Test splines.

[0035] According to the GB / T 2406.2-2009 method, the oxygen index of the prepared epoxy resin was 20.4%.

[0036] According to GB / T 2408-2008, the prepared epoxy resin was tested for its vertical combustion r...

Embodiment 2

[0038] (1) Preparation of expandable graphite flame retardant epoxy resin composites

[0039]a Weigh 25g of expandable graphite and add it to 168.75g of epoxy resin, stir at a speed of 500r / min for 10min in a constant temperature water bath at 60°C and mix evenly;

[0040] b Take by weighing 56.25g curing agent and join in above-mentioned epoxy resin, continue to stir 10min at room temperature, then put into vacuum oven and carry out vacuum defoaming treatment, carry out injection molding after defoaming finishes;

[0041] c. Pre-cure the injected mold at room temperature. After the pre-curing is completed, put it into an electric blast drying oven with a temperature set at 120°C for high-temperature curing. After the high-temperature curing is completed, cool to room temperature to obtain an expandable graphite flame-retardant Epoxy composite (EG / EP) test strips.

[0042] The oxygen index of the prepared expandable graphite flame-retardant epoxy resin composite material was ...

Embodiment 3

[0045] (1) Surface functionalization of expandable graphite

[0046] a Weigh 1.21 g of tris(hydroxymethyl)aminomethane (Tris) at room temperature, dissolve it in 1 L of deionized water, then add concentrated hydrochloric acid solution to adjust the pH of the buffer to 8.5;

[0047] b Weigh 2g of dopamine hydrochloride and dissolve it in the buffer solution configured above to obtain a dopamine buffer solution with a concentration of 2mg / mL;

[0048] c take 30g of expandable graphite and put it into the dopamine buffer solution of the above-mentioned configuration, place it in a magnetic stirring device and stir for 24h;

[0049] d After the stirring is completed, perform suction filtration, wash with distilled water until colorless, and dry in an electric blast drying oven at 60°C to obtain dopamine surface-functionalized expandable graphite (PDA@EG).

[0050] (2) Preparation of dopamine surface functionalized expandable graphite flame retardant epoxy resin composites

[005...

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Abstract

A method for preparing a dopamine surface functionalized expandable graphite flame-retardant epoxy resin, relating to a method for preparing a flame-retardant epoxy resin composite material. The invention adopts the dopamine oxidative self-polymerization technology to perform surface functionalization on expandable graphite (EG) , Uniform adhesive catechol group-rich polydopamine layer on the surface modification of EG particles, preparation of dopamine surface functionalized EG, and application to epoxy resin. Use the active functional groups in the polydopamine layer to chemically bond with the epoxy groups to form an interfacial bond, and then "integrate" the flame retardant with the matrix to solve the problem of uneven dispersion of EG in the epoxy resin matrix and poor interfacial compatibility, etc. problem, and significantly improve its flame retardant efficiency. At the same time, the process of combining room temperature curing and high temperature curing to prepare flame retardant epoxy resin composite materials can further improve the dispersion of flame retardants in the curing process of epoxy resin. The method involved in the invention is environmentally friendly and highly adjustable, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of flame retardant preparation and polymer material modification, and in particular relates to a preparation method of dopamine surface functionalized expandable graphite flame retardant epoxy resin. Background technique [0002] Polymer materials are widely used in construction, transportation, agriculture, electrical and electronic industries and other fields because of their excellent physical, chemical, thermal and mechanical properties. Of course, some polymer materials also have disadvantages such as low mechanical properties, poor impact resistance, and anisotropy, which limit their application fields. The main disadvantage of polymer materials is poor fire resistance. When a polymer material is exposed to a high temperature environment (such as 300-400°C), it decomposes and burns to release a large amount of heat, smoke and toxic gases. When exposed to an appropriate temperature (such as 100-200°C)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08K9/04C08K9/00C08K3/04B29C35/02C08G59/50
CPCC08K9/04C08K9/00C08K3/04B29C35/0288C08G59/5006C08L2201/02C08L63/00
Inventor 陈婷婷徐艺斐喻源
Owner NANJING TECH UNIV
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