Method for preparing modified aramid pulp/PMMA composite material through supercritical carbon dioxide polymerization

A technology for modifying aramid fibers and composite materials, which is applied in the production of bulk chemicals, fiber types, textiles, and papermaking, and can solve problems such as difficult dispersion, low density, and easy coalescence

Inactive Publication Date: 2021-03-19
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aramid pulp is a new type of synthetic fiber made by surface microfibrillation of aramid fibers. The surface contains a large number of plush-like ultra-fine microfibers. It has large specific surface area, good dimensional stability, low density and high strength. , high temperature resistance and corrosion resistance, etc., so it has a wide range of applications in the field of composite material reinforcement, but aramid pulp is easy to coalesce due to the entanglement of fibrils on the surface, and it is not easy to disperse when used in PMMA matrix materials. surface treatment or modification

Method used

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  • Method for preparing modified aramid pulp/PMMA composite material through supercritical carbon dioxide polymerization

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A method for preparing modified aramid pulp / PMMA composite material by supercritical carbon dioxide polymerization, such as figure 1 shown, the steps are as follows:

[0038] (1) Put a certain amount of dried Kevlar29 aramid fiber pulp into the reactor at room temperature (25°C), then add a certain amount of liquid monomer MMA and initiator (dibenzoyl peroxide), and seal the Reactor; the mass ratio of MMA to aramid pulp is 1:3; the mass ratio of initiator to MMA is 1:100;

[0039] (2) Fill CO into the reactor 2 After the gas reaches a pressure of 0.5MPa, vacuumize, repeat the inflation-vacuum operation 3 times, and exhaust the air in the kettle and pipeline;

[0040] (3) Fill CO into the reactor 2 After the gas reaches a pressure of 18MPa, the temperature in the kettle is raised to 70°C at a rate of 5°C / min, so that the CO2 in the kettle is increased. 2 After reaching the supercritical state, the modified aramid pulp is obtained after 20h of heat preservation;

[0...

Embodiment 2

[0058] A method for preparing modified aramid pulp / PMMA composite material by supercritical carbon dioxide polymerization, the steps are as follows:

[0059] (1) Put a certain amount of dried Kevlar49 aramid fiber pulp into the reaction kettle at room temperature (26°C), and then add a certain amount of liquid monomer MMA and initiator (dodecanoyl peroxide) to block the reaction kettle; the mass ratio of MMA to aramid pulp is 2:3; the mass ratio of initiator to MMA is 1:80;

[0060] (2) Fill CO into the reactor 2 After the gas reaches a pressure of 0.5MPa, vacuumize, repeat the inflation-vacuum operation 3 times, and exhaust the air in the kettle and pipeline;

[0061] (3) Fill CO into the reactor 2 After the gas reaches a pressure of 20MPa, the temperature in the kettle is raised to 75°C at a rate of 8°C / min, so that the CO2 2 After reaching the supercritical state, the modified aramid fiber pulp was obtained after 24 hours of heat preservation;

[0062] (4) stirring the ...

Embodiment 3

[0066] A method for preparing modified aramid pulp / PMMA composite material by supercritical carbon dioxide polymerization, the steps are as follows:

[0067] (1) put a certain amount of dried Kevlar129 aramid fiber pulp into the reactor at room temperature (27 ° C), then add a certain amount of liquid monomer MMA and initiator (potassium persulfate), and close the reactor; The mass ratio of MMA to aramid pulp is 1:1; the mass ratio of initiator to MMA is 1:60;

[0068] (2) Fill CO into the reactor 2 After the gas reaches a pressure of 0.5MPa, vacuumize, repeat the inflation-vacuum operation 3 times, and exhaust the air in the kettle and pipeline;

[0069] (3) Fill CO into the reactor 2 After the gas reaches a pressure of 20MPa, the temperature in the kettle is raised to 75°C at a rate of 10°C / min, so that the CO2 2 After reaching the supercritical state, the modified aramid pulp was obtained after 22h of heat preservation;

[0070] (4) stirring the modified aramid fiber pu...

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Abstract

The invention relates to a method for preparing a modified aramid pulp/PMMA composite material by supercritical carbon dioxide polymerization, which comprises the following steps: permeating MMA and an initiator corresponding to the MMA into aramid pulp under the carrying action of supercritical CO2, initiating MMA polymerization to obtain modified aramid pulp, and compounding the modified aramidpulp with PMMA to obtain the composite material. The tensile strength of the composite material is 47.83 to 63.52 MPa, the elongation at break of the composite material is 3.5 to 6.8 percent, and thebending strength of the composite material is 56.8 to 62.4 MPa. According to the method, the aramid pulp is modified by adopting supercritical CO2, MMA and the initiator, so that the aramid pulp can be well dispersed in PMMA, the content of the aramid pulp in PMMA is increased, the strength, wear resistance and the like of PMMA are favorably improved, and meanwhile, the method adopts an environment-friendly supercritical fluid technology for modification, does not introduce toxic solvents, and is suitable for tooth base material requirements.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a method for preparing a modified aramid fiber pulp / PMMA composite material by supercritical carbon dioxide polymerization. Background technique [0002] PMMA (polymethyl methacrylate) has the advantages of high mechanical strength, light weight and easy processing, which makes its application space very wide. There are also applications in covers, instrument housings and optical lenses. At the same time, because of its adjustable color, good aesthetic properties and good biocompatibility, it has become one of the most commonly used biomedical materials in the field of oral science. However, the PMMA denture base has problems such as low hardness, easy wear, and easy fracture. Therefore, the modification and research of PMMA denture base material is particularly important. [0003] The enhancement and modification of PMMA can use inorganic nanomaterials, glass fibers,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/12C08L77/10D06M14/16C08J5/04
CPCC08L33/12D06M14/16C08J5/046D06M2101/36C08L2205/16C08L2203/30C08J2333/12C08J2477/10C08L77/10Y02P20/54
Inventor 孔海娟李彪杜雪徐前姜飞燕曾娟郝钰孙晓玲宋吉银余木火于治水张培磊
Owner SHANGHAI UNIV OF ENG SCI
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