Nylon 6/plant fiber composite material and preparation method thereof

A plant fiber and composite material technology, applied in the field of composite materials, can solve the problems of incomplete plasticization of nylon, inferior mechanical properties to extrusion injection molding, short hot pressing time, etc.

Inactive Publication Date: 2013-04-17
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Herman Wintin (Winata H, Turng L, Daniel F, et al. Applications of Polyamide / Cellulose Fiber / Wollastonite Composites for Microcellular Injection Molding[J]. Antec, 2003) used microcellular injection molding to reduce the temperature of injection molding , the results show that microporous injection molding can be carried out at a lower temperature (187°C), which can well avoid the degradation of fibers at high temperatures, but the micropores introduced by supercritical fluid are around the plant fibers, which affect the interface bonding, and there is no A very good reinforcement effect has been achieved; XuXiaolin (Cellulose fiber reinforced nylon 6 or nylon 66 composites[D]. Georgia: Georgia Institute of Technology, 2008.) was directly thermocompressed after low-temperature mixing and extrusion, and found that various mechanical properties of thermocompression molding The performance is not as good as extrusion injection molding; McHenry (Composite materials based on wood and nylon fiber[J]. Composites Part A: applied science and manufacturing, 2003) mixed waste nylon fiber and wood fiber first, and then hot pressed at 230°C The composite material was prepared in 2.5 minutes, and the composite material obtained had a better reinforcement effect than the polypropylene wood fiber composite material prepared under the same conditions. However, due to the short hot pressing time, the heat transfer was limited when the fiber content exceeded 2.5%. Nylon plasticization is not complete, resulting in nylon fibers can not be well combined with wood fibers

Method used

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  • Nylon 6/plant fiber composite material and preparation method thereof
  • Nylon 6/plant fiber composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In parts by weight, 100 parts of caprolactam (abbreviation for ε-caprolactam) in 90 o Melting in a constant temperature water bath, after the melting is completed, add 0.5 parts of wood plant fiber, stir and mix evenly at a high speed, so that the wood plant fiber is dispersed in the molten caprolactam, and then add 0.4 part of catalyst 6-aminocaproic acid and cocatalyst sodium phosphate 0.6 parts, 1.5 parts of activator, 5 parts of water, at 90 o Stir and mix evenly in a constant temperature water bath; add it to the reaction kettle, replace the air in the kettle with nitrogen for at least three times and protect it with nitrogen. o C temperature, 7×10 5 React under Pa pressure for 6 hours; feed nitrogen into the reactor and discharge the nitrogen, and remove the small molecule water produced in the prepolymerization stage; exhaust and vacuumize the reaction system, and the reaction system is at 210 oC Under the temperature, the degree of vacuum (gauge pressure) is ...

Embodiment 2

[0042] In parts by weight, 100 parts of caprolactam at 90 o Melting in a constant temperature water bath, after the melting is completed, add 0.8 parts of wood plant fiber, stir and mix evenly at a high speed, so that the wood plant fiber is dispersed in the molten caprolactam, and then add 0.5 part of catalyst phosphoric acid and 0.7 part of cocatalyst sodium nucleotide , 2 parts of activator, 8 parts of water, at 90 o Stir and mix evenly in a constant temperature water bath; add it to the reaction kettle, replace the air in the kettle with nitrogen for at least three times and protect it with nitrogen. o C temperature, 8×10 5 React under Pa pressure for 5 hours; feed nitrogen into the reactor and discharge the nitrogen, and remove the small molecule water produced in the prepolymerization stage; exhaust and vacuumize the reaction system, and the reaction system is at 200 o C temperature, vacuum degree (gauge pressure) is -0.085MPa, react for 1.5 hours, and obtain nylon 6 / p...

Embodiment 3

[0044] In parts by weight, 100 parts of caprolactam at 90 o Melting in a constant temperature water bath, after the melting is completed, add 1.2 parts of hemp plant fiber, stir and mix evenly at a high speed, so that the single fiber of hemp plant is dispersed in the molten caprolactam, and then add 0.5 part of catalyst phosphoric acid and 0.7 part of cocatalyst sodium nucleotide , 2.5 parts of activator, 6 parts of water, at 90 o Stir and mix evenly in a constant temperature water bath; add it to the reactor, replace the air in the reactor with nitrogen for at least three times and protect it with nitrogen. o C temperature, 1×10 6 React under Pa pressure for 4.5 hours; feed nitrogen into the reactor and discharge the nitrogen, and remove the small molecule water produced in the prepolymerization stage; exhaust and vacuumize the reaction system, and the reaction system is at 220 o C temperature, vacuum degree (gauge pressure) is -0.09MPa, react for 2 hours, and obtain nylon...

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Abstract

The invention discloses a nylon 6/plant fiber composite material and a preparation method thereof. The composite material is prepared and obtained by in-situ polymerization of the following components in part by weight: 100 parts of Epsilon-caprolactam, 0.2-1.5 parts of plant fibers, 0.3-0.8 part of catalyst, 0.3-1 part of cocatalyst, 0.5-3 parts of activators and 2-10 parts of water. The preparation method of the nylon 6/plant fiber composite material comprises the following steps: melting the monomer Epsilon-caprolactam, uniformly agitating and mixing with the plant fiber, the catalysts, the cocatalyst, the activator and the water and singly dispersing the plant fibers in the molten Epsilon-caprolactam, adding into a reaction vessel for reaction and preparing the nylon 6/plant fiber composite material with excellent performance through the processes of prepolymeriazation, nitrogen introduction, water removal and post polymerization.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a nylon 6 / plant fiber composite material and a preparation method thereof, in particular to a nylon 6 / plant fiber composite material prepared by an in-situ synthesis method. Background technique [0002] Plant fiber is the most abundant natural polymer material in nature. The total amount of cellulose (existing in the form of natural plant fiber) grown in nature every year is as high as 100 billion tons, far exceeding the total proven oil reserves on the earth. . As a huge and renewable natural resource, plant fiber is a research hotspot at this stage, how to make full use of the various advantages of plant fiber to find a more effective use method and a wider application field. The specific strength of plant fiber is close to that of glass fiber, and the specific modulus even exceeds that of glass fiber. In terms of comprehensive performance and perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L97/02C08G69/16C08G69/14
Inventor 彭少贤赵西坡
Owner HUBEI UNIV OF TECH
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