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Aramid fiber-reinforced rein-based composite material and preparation method thereof

A technology for reinforcing resin-based and aramid fibers, which is applied in fiber types, fiber treatment, textiles and papermaking, etc. It can solve the problem of low grafting on the surface of Kevlar fibers, low ratio of biological enzymes to hydrogen peroxide, long-term polyacrylamide Poor stability and other issues, to achieve good swelling effect, not easy to chemical reaction or degradation, good weather resistance

Inactive Publication Date: 2012-06-27
SUZHOU UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has the following disadvantages: (1) Dioxane is used as a solvent, and the solvent reduces the activity of biological enzymes by about 20-30% (Chen Jianbo, Xia Chungu, Li Shuben. Horseradish overheating in a water-organic solvent mixed system Catalytic reaction of oxidase. Journal of Shanghai Normal University (Natural Science Edition). 2005.34: 71-75); at the same time, the solvent used cannot create conditions for the full contact between the biological enzyme and the fiber, resulting in low utilization of the biological enzyme; (2) The ratio of the amount of biological enzymes to hydrogen peroxide is low, making it impossible to generate enough active sites to catalyze polymerization
The above two reasons lead to the low grafting amount on the surface of Kevlar fiber, and the molecular weight of the obtained graft is not high, resulting in the inability to generate a polymer coating layer, so that the modification effect of the fiber is not good
(3) The polymer grafted in this study—polyacrylamide also has several obvious shortcomings. First, although the amide group on its side group is relatively active, various typical reactions of amide can occur, such as hydrolysis reaction, hydroxyl Methylation reaction, sulfomethylation reaction, Mannich reaction, Hofmann degradation reaction and cross-linking reaction, through which a variety of functional derivatives can be obtained
However, it generally needs to be carried out under alkaline conditions, which will cause damage to the mechanical properties of the fiber itself.
Secondly, the long-term stability of polyacrylamide is poor. When the temperature is higher than 70°C, the amide group is easily hydrolyzed, and it can also cause degradation or other chemical reactions under light, heat and mechanical action.
Therefore, applying it to the modification of Kevlar fibers will cause deterioration of fiber properties

Method used

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  • Aramid fiber-reinforced rein-based composite material and preparation method thereof
  • Aramid fiber-reinforced rein-based composite material and preparation method thereof
  • Aramid fiber-reinforced rein-based composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 1. Preparation of aramid fiber coated with acrylate derivative polymer

[0040] 1) Put the aramid fiber in acetone that can remove the surface attachment, let it stand for 6 hours to remove the dirt on the fiber surface, then wash it with water for 3 hours, dry it in vacuum and set it aside, it is unmodified aramid fiber Fiber, denoted as KF. Its surface morphology SEM photos, infrared spectrograms, tensile properties, contact angles, ultraviolet light and 20wt% phosphoric acid before and after immersion in 24 hours of tensile properties of KF fibers are shown in figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 and shown in Table 1.

[0041] 2) Take a total of 0.68g of potassium dihydrogen phosphate and sodium chloride, 20.5ml of 0.1mol / L sodium hydroxide, dilute with water to 100ml, and prepare a PBS buffer solution with a pH value of 6.8.

[0042] 3) Under the protection of nitrogen, put 1g of KF aramid fiber into a three-necked flask, add 20ml of PBS bu...

Embodiment 2

[0051] 1. Preparation of aramid fiber coated with acrylate derivative polymer

[0052] 1) Take 1.20g of sodium dihydrogen phosphate and sodium chloride in total, 13.2ml of 0.1mol / L potassium hydroxide, dilute to 100ml with water, prepare a buffer solution with a pH value of 6.5, and set aside.

[0053] 2) Under nitrogen protection, place 1g of KF aramid fiber in a three-necked flask, add 13.5ml of PBS buffer solution, add 50ml of N,N-dimethylformamide and water mixed solvent (N,N- The volume ratio of dimethylformamide to water is 2.6:1, and the solubility parameter of this mixed solvent is 15.3 cal 1 / 2 cm -3 / 2 ), 10mg of horseradish peroxidase, 85ml of glycidyl methacrylate, 40ml of hydrogen peroxide with a mass fraction of 0.1% was added dropwise, reacted at 45°C for 7 hours, and the aramid fiber was taken out.

[0054] 3) The aramid fibers obtained in step 2) were extracted with a mixed solution of water and acetone for 12 hours, and then vacuum-dried for 14 hours to obtai...

Embodiment 3

[0061] 1. Preparation of aramid fiber coated with acrylate derivative polymer

[0062] 1) Take 1.36g of potassium dihydrogen phosphate and 79ml of 0.1mol / L sodium hydroxide, dilute with water to 200ml, prepare a buffer solution with a pH value of 7.4, and set aside.

[0063] 2) Under nitrogen protection, place 1g of KF aramid fibers in a three-necked flask, add 100ml of PBS buffer solution, add 45ml of toluene, a mixed solvent of cyclohexanone and water (the volume of toluene, cyclohexanone and water The ratio is 1:2:2, and the solubility parameter of the mixed solvent is 15.0 cal 1 / 2 cm -3 / 2 ), 20mg of horseradish peroxidase, 65ml of hydroxypropyl methacrylate, 1ml of hydrogen peroxide with a mass fraction of 6% was added dropwise, reacted at 35°C for 30 hours, and the aramid fiber was taken out.

[0064] 3) The aramid fibers obtained in step 2) were extracted with a mixed solution of water and acetone for 5 hours, and then vacuum-dried for 17 hours to obtain polyhydroxypro...

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Abstract

The invention relates to an aramid fiber-reinforced rein-based composite material and a preparation method thereof. Aramid fibers coated with an acrylic ester derivative polymer are prepared with a biological enzyme treatment method. A composite material is molded according to different substrate resins by adopting the conventional molding processes of fiber-reinforced resin-based composite materials such as die pressing, laminating, a hot pressing tank and the like or liquid phase molding processes such as resin transfer molding (RTM), a resin film infiltration (RFI) process and the like, so that the aramid fiber-reinforced rein-based composite material is obtained. Compared with a composite material prepared with unmodified aramid fibers, the composite material provided by the invention has the advantage that: the interlaminal shear strength is raised by 10-25 percent. The technical scheme of the invention has the characteristics of small fiber damage, mild reaction conditions, simple and practicable process, environmental friendliness and high industrial production benefit.

Description

technical field [0001] The invention relates to a resin-based composite material and a preparation method thereof, in particular to an aramid-reinforced fiber-reinforced resin-based composite material and a preparation method thereof. technical background [0002] In today's era of rapid development of science and technology, high-performance fibers play a pivotal role. Aramid fiber has excellent properties such as light weight, high specific strength (equivalent to 5 to 6 times that of steel wire), high specific modulus, corrosion resistance, wear resistance, excellent thermal conductivity at low temperature, and excellent adsorption capacity. It shows great application potential in many cutting-edge industrial fields, among which aramid fiber-reinforced resin-based composite material is the main application form of aramid fiber, accounting for about 70-80% of the total application of aramid fiber. [0003] However, due to the highly oriented crystallization of aramid fibe...

Claims

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Application Information

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IPC IPC(8): C08J5/06C08L63/00C08L79/08C08L67/06C08L79/04C08L77/10D06M14/16D06M101/36
Inventor 顾嫒娟厉世能梁国正袁莉
Owner SUZHOU UNIV
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