Preparation method for continuous fibre fabric-reinforced anionic polyamide 6 composite material and composite material

A continuous fiber and composite material technology, applied in the field of composite materials, can solve the problems of many processes, low carbon fiber content, and limited application, and achieve the effects of increasing the degree of polymerization reaction, increasing fiber volume content, and improving mechanical properties

Inactive Publication Date: 2015-09-16
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the difficulty in manufacturing thermoplastic composite prepregs, the total cost after molding is higher than that of thermosetting composite materials, which limits the application of continuous fiber reinforced thermoplastic composite materials in industries such as national defense, military and industrial civilians.
[0004] Chinese patent CN 103087516 A discloses a preparation method of nylon 6 / natural fiber composite material, which pretreats natural fibers and prepares nylon 6 composite material by reaction processing method, but there is no detailed report on the basic mechanical properties
Chinese patent CN1292394A discloses carbon fiber reinforced cast nylon composite material, but due to the low content of carbon fiber, the improvement of mechanical properties and friction properties of the composite material is limited
Chinese utility model CN203004185U reports a forming device for continuous fiber-reinforced MC nylon sheets, which can produce glass fiber composite sheets, but the equipment is complex, there are many processes, and the required site is relatively large

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Preparation method for continuous fibre fabric-reinforced anionic polyamide 6 composite material and composite material

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preparation example Construction

[0032] The preparation method of the continuous fiber fabric reinforced anionic polyamide 6 composite material of the present invention specifically comprises the following steps:

[0033] (1) Place the continuous fiber fabric in an oven at 200-400°C, heat and dry it with inert gas for 2-4 hours, then lay it in a composite mold, and preheat it in an oven or a hot press. The inert gas introduced is at least one of nitrogen, argon or helium.

[0034] (2) Heat the caprolactam monomer in a reaction vessel to 110-130°C to melt the material, add an initiator after vacuum dehydration for 0.5-1 hour, and continue vacuum dehydration for 0.5-1 hour;

[0035] (3) After releasing the vacuum, add the catalyst into the reaction vessel to disperse for 1 to 8 minutes, use the liquid molding method to pump the reaction solution into the composite material mold that has been laid with continuous fiber fabric and preheated to 150 to 180°C, and keep warm for 0.5 After ~1 hour, the mold is demoul...

Embodiment 1

[0048] Place 45 parts by mass of continuous quartz fiber three-dimensional fabrics in a 200°C oven fed with nitrogen to dry for 4 hours, then lay them on a composite material mold and preheat them to 150°C, then add 100 parts by mass of caprolactam monomer to a 1L reactor, and heat up to Melt at 110°C, add 0.1 parts by mass of sodium hydroxide after vacuum dehydration for 0.5 hours, continue vacuum dehydration for 0.5 hours, then add 0.3 parts by mass of toluene 2,4 diisocyanate, stir for 8 minutes and quickly inject the reaction solution into the already Preheat to 150° C. in a mold (pressure 0.1 MPa), demould after 0.5 hour to obtain continuous glass fiber fabric reinforced anionic polyamide 6 composite material (fiber weight fraction 30%). The typical properties of the composite materials are shown in Table 1.

Embodiment 2

[0050] Arrange 50 parts by mass of continuous carbon fiber plain weave into a 400°C oven filled with nitrogen and dry for 2 hours, then lay it on the composite material mold and preheat it to 160°C, then add 100 parts by mass of caprolactam monomer into a 1L reactor and heat up to 120°C After melting and vacuum dehydration for 0.5 hours, add 0.3 parts by mass of sodium methoxide, continue vacuum dehydration for 0.5 hours, then add 0.6 parts by mass of toluene 2,4 diisocyanate, stir for 3 minutes and quickly inject the reaction solution into the preheated to In a mold at 160° C. (pressure 0.3 MPa), demould after 0.5 hour to obtain a continuous carbon fiber fabric reinforced anionic polyamide 6 composite material (fiber weight fraction 50%). The typical properties of the composite materials are shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention relates to a preparation method for a continuous fibre fabric-reinforced anionic polyamide 6 composite material and the composite material. The composite material is prepared from the following raw materials: caprolactam, a continuous fibre fabric, an initiator and a catalyst, wherein a caprolactam anionic polymerization reaction is adopted, and a reaction liquid is pumped and injected in the paved continuous fibre fabric by virtue of a liquid shaping method and polymerized in a preheated die to obtain the continuous fibre fabric-reinforced anionic polyamide 6 composite material. The preparation method can be used for increasing the fibre volume content in the composite material and obviously improving the mechanical properties of the thermoplastic composite materials, and has important popularization and application prospect in the fields of aerospace and aviation, automobile industry and the like.

Description

technical field [0001] The invention relates to a preparation method of a continuous fiber fabric reinforced anionic polyamide 6 composite material and the composite material, belonging to the field of composite materials. Background technique [0002] Anionic polyamide 6 is a new type of thermoplastic engineering plastic developed by caprolactam anionic polymerization technology in the early 1960s. Caprolactam monomer forms anion in the presence of a strong base and polymerizes rapidly to form a linear polymer with a molecular weight of more than 100,000. The reaction polymerization time is short, and monomer casting, reaction injection and reaction extrusion molding can be adopted. In addition to the characteristics of ordinary polyamide 6 materials, anionic polyamide 6 products have high molecular weight and high crystallinity, and their mechanical strength is 1.5 times higher than that of ordinary polyamide 6. They can be directly cast into large components of hundreds ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/20C08L77/02
Inventor 朱世鹏冯志海左小彪杨云华孔磊孙福瑞潘月秀
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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