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Method for enhancing fire resistance and thermal stability of PVC through oxidized graphene

A technology of thermal stability and graphene, applied in the field of new materials, can solve the problems of poor thermal stability and reduced fire resistance of PVC materials, and achieve the effects of enhancing thermal stability, enhancing dispersibility, and enhancing fire resistance.

Inactive Publication Date: 2015-12-30
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to solve the problems of poor thermal stability of PVC materials and reduced fire resistance after adding plasticizers

Method used

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  • Method for enhancing fire resistance and thermal stability of PVC through oxidized graphene
  • Method for enhancing fire resistance and thermal stability of PVC through oxidized graphene
  • Method for enhancing fire resistance and thermal stability of PVC through oxidized graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1) Graphene oxide is dispersed in the solvent DMF

[0041] Weigh graphene oxide, the mass (mg) of graphene oxide and the volume (mL) ratio of DMF are 10:30, 20mg graphene oxide that weighs is added in the DMF of 60mL, ultrasonic power 70W, frequency 40KHz, time is 60 minutes, obtains the yellow-brown solution A;

[0042] 2) Modification of graphene oxide

[0043] 2.1) Measure modifying agent APTS, the ratio of the volume (mL) of described modifying agent APTS (3-aminotriethoxypropyl silane) and the quality (mg) of graphene oxide used in step 1) is 0.5:1; Add the weighed 10mL modifier APTS into the tan solution A obtained in step 1) to obtain the mixed solution B;

[0044]2.2) Weigh the dehydrating agent, the mass ratio of the dehydrating agent dicyclohexylcarbodiimide to the graphene oxide used in the step 1) is 50:1; add 1g of the dehydrating agent to the solution B obtained in the step 2.1) , to obtain a gradually darker yellow-brown liquid, which is the mixed liqu...

Embodiment 2

[0060] 1) Graphene oxide is dispersed in the solvent DMF

[0061] Graphene oxide is taken, the ratio of the mass (mg) of the graphene oxide to the volume (mL) of DMF is 20:40, the weighed 40mg graphene oxide is added in the DMF of 80mL, ultrasonic power 70W, The frequency is 40KHz, and the time is 70 minutes to obtain a yellow-brown solution A;

[0062] 2) Modification of graphene oxide

[0063] 2.1) Measure modifying agent APTS, the ratio of the volume of described modifying agent APTS and the graphene oxide mass used in step 1) is 1:1; 20mL modifying agent APTS that weighs is added to step 1 ) in the yellow-brown solution A obtained, to obtain the mixed solution B;

[0064] 2.2) Weigh the dehydrating agent, the mass ratio of the dehydrating agent dicyclohexylcarbodiimide to the graphene oxide used in step 1) is 70:1; 2.8g dehydrating agent is added to the solution B obtained in step 2.1) In the process, a yellowish-brown liquid that gradually becomes darker is obtained, w...

Embodiment 3

[0079] 1) Graphene oxide is dispersed in the solvent DMF

[0080] Take graphene oxide, the ratio of the quality (mg) of described graphene oxide and the volume (mL) of DMF is 30:50, the 60mg graphene oxide that weighs is added in the DMF of 100mL, ultrasonic power 70W, The frequency is 40KHz, and the time is 90 minutes to obtain a yellow-brown solution A;

[0081] 2) Modification of graphene oxide

[0082] 2.1) Measure modifier APTS, the ratio of the volume of the modifier APTS to the graphene oxide used in step 1) is 1:1.5; 90mL modifier APTS weighed is added to step 1 ) in the yellow-brown solution A obtained, to obtain the mixed solution B;

[0083] 2.2) Weigh the dehydrating agent, the mass ratio of the dehydrating agent dicyclohexylcarbodiimide to the graphene oxide used in step 1) is 100:1; add 6g of dehydrating agent to the solution B obtained in step 2.1) , to obtain a gradually darker yellow-brown liquid, which is the mixed liquid C;

[0084] 2.3) Ultrasound the m...

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Abstract

The invention relates to the technical field of new materials, in particular to a method for enhancing the fire resistance and the thermal stability of PVC through functional oxidized graphene. According to the method, overflow of degradation products and poisonous gas and transmission of heat are inhibited in burning through a net-shaped carbon skeleton structure of the oxidized graphene, so that the fire resistance and the thermal stability of the PVC can be improved. For the defect that the property is influenced due to the fact that the oxidized graphene is poor in dispersibility in the PVC, the oxidized graphene is modified with 3-aminopropyltriethoxysilane; through amidation between amino end groups and carboxyl groups on the oxidized graphene, a SiO2 layer is successfully anchored on the surface of the oxidized graphene; finally, through ultrasonic dispersing, mixing, falling film casting and the like, GO is composited with the PVC.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a method for functionalizing graphene oxide to enhance the fire resistance and thermal stability of PVC. Background technique [0002] PVC is a thermoplastic linear resin produced by addition polymerization of monomer vinyl chloride. Its global usage ranks second among all kinds of synthetic materials, and it is being produced and applied worldwide with a growth rate of 4%. It is mainly used to make cards, wallpapers, PVC curtains, PVC coated welded wire mesh, foam boards, PVC ceilings, water pipes, packaging bags, etc. It has high strength, weather resistance and excellent geometric stability. Strong resistance to chemicals and strong acids. In the process of processing, the use of plasticizer will reduce its flame retardancy to a certain extent. It is easy to burn when subjected to high temperature, releasing a lot of heat, smoke and toxic gases, and its heat resistance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08K9/06C08K9/04C08K3/04
Inventor 孟小庆龙海周志明董立春
Owner CHONGQING UNIV
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