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A molding-rolling compound molding process method of natural hemp fiber reinforced composite material

A composite material and fiber reinforced technology, which is applied in the fields of plant fibers, fiber processing, chemical instruments and methods, can solve the problems that the mechanical properties of materials are difficult to be further improved, and the internal tissue density of composite materials is difficult to be further improved. Safety, lightweight, and compact internal organization

Active Publication Date: 2020-07-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing molding process of natural hemp fiber-reinforced composite materials mainly adopts molding method, and the pressure of molding is vertical downward pressure, completely relying on the hydraulic press, after reaching a certain level, it is difficult to further increase the density of the internal structure of the composite material, so It is also difficult to further improve the mechanical properties of the material

Method used

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  • A molding-rolling compound molding process method of natural hemp fiber reinforced composite material
  • A molding-rolling compound molding process method of natural hemp fiber reinforced composite material
  • A molding-rolling compound molding process method of natural hemp fiber reinforced composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Carry out deep-cooling mechanical combined degumming treatment on the hemp fiber, the specific implementation steps can refer to CN106591961B;

[0020] 2) Mix the hemp fiber and polypropylene fiber with an average length of 7cm according to the ratio of 2:3 for 1min, then transport it to the carding machine for carding, and then send it to the web lapper to lay the net, fold the laid net Send it to the main needling machine for needling to prepare the felt;

[0021] 3) Immerse the felt in the prepared 15wt% ammonium polyphosphate solution for 30 minutes, then take it out and dry it with hot air;

[0022] 4) Non-woven polypropylene fibers are arranged on the upper and lower surfaces of the felt to increase the mechanical properties of the composite material;

[0023] 5) After cutting the treated felt material into the required size, put it into the mold and heat it together, the heating temperature is 220°C, the heating time is 2min, and the mold material is H13;

...

Embodiment 2

[0026] 1) First, the jute fiber, flax fiber and polylactic acid fiber with a length of about 7cm are solid-phase blended according to the ratio of 1:1:2, and then transported to the carding machine by airflow for carding, and then the fiber is sent to the web-laying machine Intermediate cross-laying, needle-punched and consolidated to prepare felt (prefabricated body);

[0027] 2) Immerse the felt in the prepared 15wt% flame retardant solution for 20 minutes, then take it out and dry it with hot air, wherein the flame retardant is ammonium sulfate;

[0028] 3) After cutting the treated felt material into the required size, put it into the mold and heat it together. The heating temperature is 200°C, the heating time is 2 minutes, and then a layer of decoration is covered, and the mold material is H11;

[0029] 4) Put the mold on the rolling mill for rolling, and the roll temperature is 90°C. After demoulding, the hemp fiber reinforced composite material can be obtained, and t...

Embodiment 3

[0031] 1) Firstly, the sisal fiber and nylon 66 fiber with a length of 7cm are solid-phase blended according to the ratio of 1:1, and then the carded fiber is sent to the laminating machine to lay the net, and the laid net is folded Send it to the main needling machine for needling to prepare the felt;

[0032] 2) Immerse the felt in the prepared 10% ammonium hydrogen borate solution for 30 minutes, then take it out and dry it with hot air;

[0033] 3) After cutting the treated felt material into the required size, put it into the mold and heat it together. The heating temperature is 270°C, the heating time is 1min, and the mold material is 5CrNiMo;

[0034] 4) Put the mold on the rolling mill for rolling, the temperature of the rolls is 100°C, and adjust the gap distance for rolling. After demolding, the hemp fiber reinforced composite material can be obtained, and the thickness of the product is 1.5 mm.

[0035] See Table 1 for the thickness and mechanical performance tes...

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Abstract

The invention provides a mould pressing-rolling composite forming technological process for natural hemp fiber reinforced composite materials. Natural hemp fibers need to be degummed and modified, anda base material can be polypropylene, polylactic acid, polyethylene, nylon 6, nylon 66 fibers and the like. The natural hemp fibers and thermoplastic resin-based fibers are blended in solid phase toform a felt material (a prefabricated body) by airflow lapping or carding lapping and needling consolidation. On the basis of rolling forming, a forming die is additionally added to adjust the gaps between pressing rollers, and composite forming is carried out. Because of the effect of a closed die, a part of the shear force in the rolling direction is transformed into the pressure in the normal phase direction, and the rolling reduction quantity is increased. The edge cracking of a sample during rolling can also be effectively avoided, and thus the hemp fiber composite boards with different thickness can be prepared. The interior of the die has cavities with different shapes, and facilitates forming of products with various shapes.

Description

technical field [0001] The invention belongs to the field of manufacturing automotive interior parts, and relates to a compound molding process of hemp fiber reinforced composite materials. Background technique [0002] In recent years, with the advancement of automobile lightweight and the demand for low cost, the role of hemp fiber reinforced composite materials in the manufacture of automobile interior parts has become more and more important. At present, natural hemp fiber composite materials have been widely used in major automobile industry countries. The products include door inner panels, trunks, roofs, seat back panels, coat racks, and instrument panels for cars, as well as interior lining panels, door panels, roof panels, and seat back panels for trucks and buses. Natural hemp fiber composites have been tried for automotive exterior parts such as fender liners and spoilers due to their weight and cost advantages. In order to expand the application of hemp fiber c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B37/10B32B37/06B32B38/16B32B38/08D06M11/72D06M11/56D06M11/82D06M101/06
CPCB32B37/06B32B37/1054B32B38/08B32B38/164B32B2307/3065B32B2307/50B32B2605/003D06M11/56D06M11/72D06M11/82D06M2101/06
Inventor 李志刚贾红杰刘俊辉刘雪强马品奎徐进任明文王明辉宋家旺
Owner JILIN UNIV
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