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Dry-process pre-impregnating process of thermoplastic resin based pre-impregnated tape

A technology of thermoplastic resin and pre-impregnated tape, which is applied in coating and other directions, can solve problems such as poor fluidity and difficulty in impregnating reinforcing materials, and achieve the effects of low investment, improved physical and mechanical properties, and shortened impregnation distance

Inactive Publication Date: 2014-07-16
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the shortcomings of the dry process in the prior art, this application aims to provide a dry pre-impregnation process for thermoplastic resin-based needle felt, which can effectively solve the problem of difficult impregnation of reinforcing materials due to poor fluidity of high-temperature and high-viscosity resins , at the same time, it can make the reinforcing fiber and matrix resin evenly distributed in the finished product, and the mechanical properties of the product are stable

Method used

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  • Dry-process pre-impregnating process of thermoplastic resin based pre-impregnated tape
  • Dry-process pre-impregnating process of thermoplastic resin based pre-impregnated tape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) The reinforcing fiber is selected as glass fiber (diameter: 17μm1200tex), and the modified resin film is selected as polypropylene resin film (single layer weight: 120g / m 2 ). The continuous glass fiber on the creel 1 is chopped into 60-90mm, and the fiber is free to fall into the net, and is quantitatively sprinkled on the conveyor belt 4 covered with the modified resin film (the weight of the fiber net is controlled at 160g / m 2 left and right), and then lay a layer of modified resin film 5 on the chopped fiber, thus forming a three-in-one premix structure;

[0035] (2) Feed the above-mentioned premixed structure into the high-speed acupuncture machines 6 and 7 for pre-acupuncture to fix the net and compound acupuncture with a needle frequency of 45 pricks / cm 2 , the acupuncture depth is 25mm;

[0036] (3) Inspection, trimming, and winding into a single-layer pre-impregnated needle felt;

[0037] (4) Unwind single-layer pre-impregnated needle-punched felt, and p...

Embodiment 2

[0044] (1) The reinforcing fiber is selected as glass fiber (diameter: 17μm1200tex), and the modified resin film is selected as nylon PA6 resin film (single layer weight: 150g / m 2 ). The continuous reinforcing fiber on the creel 1 is chopped into 60-90mm, and the fiber falls freely, and is quantitatively sprinkled on the conveyor belt 4 covered with the modified resin film (the weight of the fiber net is controlled at 200g / m 2 left and right), and then lay a layer of modified resin film 5 on the chopped fiber, thus forming a three-in-one premix structure;

[0045] (2) Feed the above-mentioned premixed structure into the high-speed acupuncture machines 6 and 7 for pre-acupuncture to fix the net and composite acupuncture with a needle frequency of 50 pricks / cm 2 , the acupuncture depth is 30mm;

[0046] (3) Inspection, trimming, and winding into a single-layer pre-impregnated needle felt;

[0047] (4) Unwind single-layer pre-impregnated needle-punched felt, and prepare contin...

Embodiment 3

[0053] (1) The reinforcing fiber is selected as glass fiber (diameter: 17μm1200tex), and the modified resin film is selected as polypropylene resin film (single layer weight: 150g / m 2 ). The continuous glass fiber on the creel 1 is chopped into 60-90mm, and the fiber falls freely into the net, and is quantitatively sprinkled on the conveyor belt 4 covered with the modified resin film (the weight of the fiber net is controlled at 200g / m 2 left and right), and then lay a layer of modified resin film 5 on the chopped fiber, thus forming a three-in-one premix structure;

[0054] (2) Feed the above-mentioned premixed structure into high-speed acupuncture machines 6 and 7 for pre-acupuncture to fix the net and composite acupuncture with a needle frequency of 40 pricks / cm 2 , the acupuncture depth is 30mm;

[0055] (3) Inspection, trimming, and winding into a single-layer pre-impregnated needle felt;

[0056] (4) Unwind single-layer pre-impregnated needle-punched felt, and prepare...

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Abstract

The invention provides a dry-process pre-impregnating process of a thermoplastic resin based pre-impregnated tape. The dry-process pre-impregnating process mainly comprises the following steps: chopping reinforced fibers on a creel, enabling fibers to be quantitatively scattered on a conveyer belt paved with a resin film in a freely-falling and messy mode, and laying one resin film on the chopped fiber layer for form a three-layer premix material structure; carrying out pre-needling and web fixation to double sides of the premix material structure, utilizing the composite needle punching technology to enable fiber webs to be intertwined to form a three-dimensional structure; and finally, carrying out hot-baking plasticizing and molten rolling impregnation technology to prepare the continuous short fiber pre-impregnated tape. According to the production process route, technical equipment for the traditional dry-process air laying or carding is removed, the original production process flow is improved technically, and the process technical bottleneck that the high-temperature high-viscosity thermoplastic resin has difficulty in melting and impregnating the fibers due to poor mobility is solved, the quality and the yield of the products are improved, and the industrial production cost is reduced.

Description

technical field [0001] The invention belongs to the field of molding of thermoplastic composite materials, and in particular relates to a dry prepreg process of a thermoplastic resin-based prepreg tape. Background technique [0002] At present, the commonly used dry process is to laminate glass fiber needle felt with polypropylene sheet or molten polypropylene to form a sandwich, and then heat and press with a special belt press, cool and press to form a sheet. The disadvantage of this method is that the molten polypropylene has a high viscosity and it is difficult to completely impregnate the glass fiber, so that the contact surface between the matrix plastic and the reinforcing fiber is small, the interface bonding strength is poor, and the porosity in the sheet is high, resulting in poor mechanical strength of the sheet. [0003] There is a relatively advanced dry process (also known as carding process) in China, which is mainly to chop the reinforcing fiber and mix it wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B15/10
Inventor 韩旭杨旭静陶友瑞鲁雄段书用唐荣华
Owner HUNAN UNIV
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