Preparation method of continuous fiber reinforced nylon-6 composite material

A technology of continuous fibers and composite materials, applied in the field of material preparation, can solve the problems of deteriorating the properties of composite materials, appearing holes in composite materials, deteriorating mechanical properties of composite materials, etc., and achieves good impregnation, improved mechanical properties, and excellent pressure holding effect.

Active Publication Date: 2017-08-11
江苏易元新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The impregnation of the fiber by the caprolactam melt is a crucial factor affecting the performance of the composite material. However, in the existing patents, the caprolactam melt before entering the mold usually contains both a catalyst and a co-catalyst, and the melt is transported to the mold. During the process, melt polymerization or crystallization is usually prone to phenomena that are not conducive to melt flow, which will have a negative impact on the impregnation of fibers and melt, thereby deteriorating the mechanical properties of the composite material; secondly, use the vacuum suction method to inject into the mold The technology of caprolactam melt is very easy to cause b

Method used

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  • Preparation method of continuous fiber reinforced nylon-6 composite material

Examples

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Effect test

Embodiment 1

[0024] A preparation method for preparing continuous fiber-reinforced nylon 6 composite material, which is prepared as follows:

[0025] Weigh 600g of caprolactam and heat it to 70°C to melt, remove a small amount of water through vacuum distillation, then divide the molten mixture into two parts of equal weight, and add them to liquid feeding devices A and B respectively. After adding 0.024g of sodium to tank A, distill under reduced pressure to remove a small amount of water; add 0.024g of toluene-2,4-diisocyanate to tank B and fully dissolve it; according to the shape of the mold, cut the quality of 400g Spread the carbon fiber cloth into the mold neatly, close the mold, and preheat the temperature to 70°C; turn on the preheated injection molding machine, and set the temperature of the injection machine from the feed port to the nozzle to 70, 90, 100, and 120°C in sequence, and turn on Liquid feeding devices A and B, at the same rate, feed the caprolactam melt into the feed...

Embodiment 2

[0027] A preparation method for preparing continuous fiber-reinforced nylon 6 composite material, which is prepared as follows:

[0028]Weigh 200g of caprolactam and heat it to 120°C to melt, remove a small amount of water through vacuum distillation, then divide the molten mixture into two parts of equal weight, and add them to liquid feeding devices A and B respectively. After adding 0.2g sodium hydroxide to tank A, distill under reduced pressure to remove a small amount of water therein; add 0.2g maleic anhydride to tank B and fully dissolve it; according to the shape of the mould, cut a hemp fiber cloth with a mass of 800g , neatly spread into the mold, close the mold, preheat the temperature to 120°C; turn on the preheated injection molding machine, set the temperature from the feeding port to the nozzle of the injection machine to 70, 90, 100, 120°C in sequence, and start the liquid feeding Devices A and B, at the same rate, add the caprolactam melt into the feeding port...

Embodiment 3

[0030] A preparation method for preparing continuous fiber-reinforced nylon 6 composite material, which is prepared as follows:

[0031] Weigh 400g of caprolactam and heat it to 95°C to melt, remove a small amount of water through vacuum distillation, then divide the molten mixture into two parts of equal weight, and add them to liquid feeding devices A and B respectively. After adding 2.008g of sodium hydride to tank A, distill under reduced pressure to remove a small amount of water; add 2.008g of diphenylmethane diisocyanate into tank B and dissolve it fully; according to the shape of the mould, cut glass fibers with a mass of 600g Lay the cloth neatly into the mold, close the mold, and preheat the temperature to 95°C; turn on the preheated injection molding machine, set the temperature from the feed port to the nozzle of the injection machine at 70, 90, 100, and 100°C in sequence, and turn on the liquid Feeding devices A and B, at the same rate, feed the caprolactam melt i...

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Abstract

The invention discloses a preparation method of a continuous fiber reinforced nylon-6 composite material, which comprises the following steps: (1) separately storing caprolactam molten masses containing a catalyst and a catalyst promoter in a constant-temperature constant-speed liquid feeding tank; (2) placing a continuous fabric in a mold of an injection molding machine; (3) starting the injection molding machine and a constant-temperature liquid feeding device separately, adding the caprolactam molten masses containing the catalyst and the catalyst promoter into the feeding hole of the injection molding machine through the liquid feeding device at a same temperature and a same speed, mixing and injecting in the mold injection machine, and injecting the caprolactam molten masses containing the catalyst and the catalyst promoter into the mold paved with the continuous fabric; and (4) initiating caprolactam negative ring-opening polymerization in the mold. The preparation method disclosed by the invention can effectively prevent caprolactam from polymerization before entering the mold, so as to ensure good impregnation of fiber and caprolactam to obtain the continuous fiber reinforced nylon-6 composite material with more excellent mechanical properties.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular to a method for preparing a continuous fiber reinforced nylon 6 composite material, in particular to a method for preparing a continuous fiber reinforced nylon 6 composite material through resin transfer molding based on anionic ring-opening polymerization. Background technique [0002] Due to the inherent shortcomings of thermosetting resin-based composites such as fracture toughness, low damage tolerance, moisture absorption, poor environmental adaptability, long production cycle, and difficulty in recycling, thermoplastic resin-based composites have made great progress in recent years. Among them, glass fiber, carbon fiber, basalt fiber and aramid fiber are used to reinforce nylon 6, and then the polyamide matrix is ​​further toughened by fiber structure optimization, mixing, and fiber surface treatment. The prepared fiber reinforced nylon 6 composite Materials have been widel...

Claims

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Application Information

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IPC IPC(8): C08L77/02C08K7/06C08K7/14C08K7/10C08L97/02C08L77/10C08G69/20
Inventor 闫东广李姜红王春亭宋玮琦周海骏郭伟杰
Owner 江苏易元新材料科技有限公司
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