Method for modifying carbon fibers with dendrimers

A technology of macromolecules and carbon fibers, which is applied in the fields of carbon fibers, fiber processing, textiles and papermaking, etc., can solve the problems of membrane limitations and poor stability, and achieve the effects of simple process, improved interface strength and unique rheological properties

Inactive Publication Date: 2011-12-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problem that only one functional group of the organosilicon compound can react with the modified surface of the fiber so that the film is limited to the two-dimensional surface and has poor stability. A method for modifying carbon fibers with dendrimers is provided.

Method used

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  • Method for modifying carbon fibers with dendrimers
  • Method for modifying carbon fibers with dendrimers
  • Method for modifying carbon fibers with dendrimers

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specific Embodiment approach 1

[0008] Embodiment 1: The method for modifying carbon fibers with dendrimers in this embodiment is as follows: 1. Add carbon fibers to a strong oxidizing acid to prepare a mixture, and then ultrasonically treat the mixture for 15 minutes to 60 minutes at a frequency of 10KHz to 100KHz , and then stir the mixture for 10min~20min, then heat to 60℃~100℃ and reflux for 2h~4h, then take out the carbon fiber and wash it with deionized water until the washing liquid is neutral, and then put the carbon fiber at 20℃~100℃, the vacuum degree is - Dry under the condition of 0.05MPa~-0.1MPa for 1h~3h to obtain acidified carbon fiber; 2. Dissolve the dendrimer in the solvent to obtain the dendrimer solution, and then add the acidified carbon fiber into the dendrimer solution , to obtain a mixed solution, then ultrasonically treat the mixed solution for 5min to 30min under the condition of 20KHz to 50KHz, and then react for 1h to 24h under the condition of 20°C to 100°C, and then alternately w...

specific Embodiment approach 2

[0013] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the strong oxidizing acid described in step one is nitric acid with a mass concentration of 1% to 70%, sulfuric acid and permanganese with a mass concentration of 1% to 100%. Potassium permanganate sulfuric acid solution with potassium permanganate concentration of 1g / L~50g / L or nitric acid with mass concentration of 1%~70% and sulfuric acid with mass concentration of 1%~100% according to the volume ratio of 1~9:1. mixed acid. Others are the same as in the first embodiment.

[0014] The interfacial shear strength of the dendrimer-modified carbon fiber / epoxy resin composite material prepared by using the dendrimer-modified carbon fiber obtained in this embodiment is 53.2MPa-55.8MPa, which is higher than that of the ring prepared by using imported carbon fiber at the same level. The interface strength of the oxygen resin composite material is increased by 30% to 70%.

specific Embodiment approach 3

[0015] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the dendrimers described in Step 2 are 1st to 4th generation hydroxyl-terminated dendrimers or 1st to 4th generation amino-terminated dendrimers. macromolecule. Others are the same as in the first or second embodiment.

[0016] The interfacial shear strength of the dendrimer-modified carbon fiber / epoxy resin composite material prepared by using the dendrimer-modified carbon fiber obtained in this embodiment is 53.2MPa-55.8MPa, which is higher than that of the ring prepared by using imported carbon fiber at the same level. The interface strength of the oxygen resin composite material is increased by 30% to 70%.

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Abstract

The invention discloses a method for modifying carbon fibers with dendrimers, which relates to a method for modifying carbon fibers. The organosilicon compound has only one functional group that can react with the modified surface of the fiber, so the film is limited to a two-dimensional surface and has poor stability. The method is as follows: carbon fibers are added into a strong oxidizing acid, subjected to ultrasonic treatment, heated to reflux, and dried, then added to a dendritic macromolecule solution for ultrasonic treatment, and then reacted at 20°C to 100°C for 1h to 24h, and then After washing and drying, dendrimer-modified carbon fibers are obtained. The dendritic macromolecule adopted in the invention has a three-dimensional structure, uniformly distributed numerous and dense external functional groups, low viscosity, unique rheological property, good film-forming property and good modification effect. The interfacial shear strength of the epoxy resin composite material prepared by using the carbon fiber modified by the dendritic macromolecule obtained by the method of the present invention is 53.2MPa-55.8MPa.

Description

technical field [0001] The invention relates to a method for modifying carbon fibers. Background technique [0002] The most commonly used functional group modification of fibers is alkane chain organic molecules (such as silane coupling agents). This organosilicon compound with two different reactive groups in the molecule can form the bonding layer of the organic phase of the inorganic phase silane coupling agent, so that better bonding strength can be obtained between the interface between the polymer and the inorganic material . However, its significant defect is that the organosilicon compound usually has only one functional group that can react with the modified surface of the fiber, so there is only one binding point, so the film is limited to a two-dimensional surface and has poor stability. Contents of the invention [0003] The technical problem to be solved by the present invention is to solve the problem that only one functional group of the organosilicon com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00D06M14/36D06M10/10D06M15/53D06M15/507D06M15/564D06M15/59D06M11/55C08L63/00C08K9/02C08K7/06D06M101/40
Inventor 赫晓东梅蕾李宜彬王荣国彭庆宇
Owner HARBIN INST OF TECH
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