CN207954878U - A kind of high-strength light bast fibre felt composition polymer foaming enhancing Varying-thickness composite plate - Google Patents

Abstract

The utility model discloses a lightweight high-strength hemp fiber felt composite polymer foaming reinforced variable-thickness composite board, which belongs to the field of automobile material design and manufacture. Aiming at the problem that the current hemp fiber composite board does not have sufficient rigidity and strength in terms of mechanical properties, and cannot realize shape-changing and thickness-changing problems, the utility model proposes a composite board made of hemp fiber composite felt and polymer foaming material. Lightweight high-strength hemp fiber felt composite polymer foam reinforced variable thickness composite board, can replace the traditional injection molding automobile spare tire cover material. The composite board has conformal shape, variable thickness, good environmental protection performance, light weight, high rigidity and strength, and good energy absorption performance. It can be widely used in the fields of automobiles, rail vehicles, aerospace, construction, decoration, packaging, etc., and has good application prospects. It is a lightweight, high-strength, multifunctional and environmentally friendly hemp fiber composite board.

Description

A lightweight high-strength hemp fiber felt composite polymer foam reinforced variable thickness composite board

technical field

The utility model belongs to the field of automobile material design and manufacture.

Background technique

With the progress of society, people's demand for environmental protection, energy saving and material saving is constantly increasing, and the requirements for materials for automobiles and automobile interior parts are also getting higher and higher, and the market competition is fierce. Lightweight is the trend of automobile development, so the application of lightweight materials in automobiles will become more and more common. As an organic material, hemp fiber has good performance and is environmentally friendly. For example, the common automobile spare tire cover plate is prepared by injection molding, which has a large weight and brittle fracture. The hemp fiber sandwich composite panels are composed of filler materials directly added between the panels. This type of hemp fiber composite panel does not have sufficient rigidity and strength in terms of mechanical properties, and cannot realize shape-changing and variable thickness.

Contents of the invention

In order to solve the problem that the existing hemp fiber composite boards do not have sufficient rigidity and strength in terms of mechanical properties, and cannot realize shape-changing and thickness-changing problems, the present invention proposes a composite polymerized light-weight high-strength hemp fiber mat. Thickness-variable composite board reinforced by material foaming, the composite board is composed of two layers of hemp fiber composite mat 2 and a reinforcement layer in the middle, and the reinforcement layer is a variable-thickness polymer foam reinforcement 3; the hemp fiber composite mat is polymer The hemp fiber composite felt of the base; the polymer in the variable thickness polymer foam reinforcement 3 is polystyrene, polyurethane, polyvinyl chloride, polyethylene, urea-formaldehyde resin, phenolic resin or polypropylene, preferably polypropylene .

A fiber composite felt made of hemp fiber and polypropylene fiber is preferred, and a composite felt with a compound ratio of 30-70% of hemp fiber and 70-30% of modified polypropylene fiber is more preferred.

Preferably, a facing layer is adhered to the outside of the hemp fiber composite felt.

The beneficial effects of the utility model:

The composite material undergoes flexible deformation under small deformation (small impact), and the deformation can recover when the external force disappears. When the deformation is large, due to the tensile properties of the fiber material, it has the characteristics of ductile fracture, and the foam material also has good energy absorption properties, so the composite material has good energy absorption properties. Moreover, since the variable-thickness polymer foam reinforcement is used as the core layer, it is possible to prepare a shape-changing, variable-thickness hemp fiber-reinforced sandwich structure composite panel that cannot be realized by the traditional hemp fiber sandwich panel. Due to the use of hemp fiber composite felt and polymer foam material, the composite board has the characteristics of light weight, which can reduce the weight by 30-70% compared with traditional injection molded parts.

Description of drawings

Fig. 1 Schematic diagram of the structure of lightweight high-strength hemp fiber felt composite polymer foam reinforced composite board with variable thickness.

Fig. 2 Schematic diagram of the preparation method of lightweight high-strength hemp fiber felt composite polymer foam reinforced composite board with variable thickness.

In the figure 1-surface layer, 2-hemp fiber composite felt, 3-variable thickness polymer foaming reinforcement.

Detailed ways

The technical scheme of the utility model is further explained and illustrated below in the manner of specific embodiments.

First heat the lower hemp fiber composite felt with the surface layer to 150-280°C, lay it in the cavity of the lower mold; then fix the variable thickness PP foam reinforcement in the cavity of the upper mold, close the mold and press down; Open the mold, and then lay the hemp fiber composite felt and surface layer heated to 150-280°C on the PP foam reinforcement with variable thickness, then close the mold, pressurize and shape, cool, and set aside.

A lightweight high-strength hemp fiber felt composite polymer foamed reinforced variable-thickness composite board with a facing layer is obtained.

In this embodiment, the hemp fiber composite mat is made of hemp fiber and polypropylene fiber, and other polymer-based hemp fiber composite mats can also be used.

Polystyrene, polyurethane, polyvinyl chloride, polyethylene, urea-formaldehyde resin and phenolic resin can be used instead of polypropylene for the compound in the variable thickness polymer foam reinforcement.

A new type of composite panel with deformation-dependent thickness sandwich structure was prepared by hot molding method. It can replace the traditional injection molding car spare tire cover material. The composite board has conformal shape, variable thickness, good environmental protection performance, light weight, high rigidity and strength, and good energy absorption performance. It can be widely used in the fields of automobiles, rail vehicles, aerospace, construction, decoration, packaging, etc., and has good application prospects. It is a lightweight, high-strength, multifunctional and environmentally friendly hemp fiber composite board.

The lightweight high-strength hemp fiber felt composited with PP foam reinforced variable thickness composite board has the advantages of light weight and good strength and rigidity due to the adoption of a core layer reinforcement method. Moreover, since the variable-thickness PP foam reinforcement is used as a reinforcing layer, a hemp fiber sandwich structure composite board with a shape and a variable thickness can be prepared. Moreover, the production method has high production efficiency and energy saving due to the one-time molding of the surface decoration layer, the panel layer and the reinforcing body, and is an efficient and environment-friendly production method.

The material can be used as automotive interior materials, such as car door panels, car roofs, car seats, and car spare tire covers. Because the plate has the characteristics of conforming to shape, variable thickness, light weight, flexible deformation and ductile fracture, the use of this material can further reduce the weight of the car and improve the safety performance of the car. In new energy vehicles, the use of lightweight materials is also an inevitable trend. For example, the battery box requires lightweight materials with good rigidity and strength, so this material can be used to make the box body, partition or cover of the battery box and other related components . Due to its good properties, this material can be widely used in auto parts, and it is a new type of multi-layer structure composite material with broad prospects.

The light-weight high-strength hemp fiber felt composite polymer foamed reinforced variable-thickness composite board can be used in decorative materials that are not the main load-bearing structure in the car. Since the body of rail transit is relatively large, when applying this product, it is necessary to produce materials large enough to meet the use requirements. According to the use requirements, two or more layers can be combined to meet the use requirements.

The composite material can be used as the interior decoration material of the aircraft. In addition, according to the safety requirements of the aircraft, a flame retardant is added to the polymer to meet the requirements of fire prevention. The composite plate can be used in non-bearing structures in aerospace, and has the advantages of simple structure and light weight. The material can also be used on interior non-load-bearing parts of civil aircraft, such as floors on aircraft.

Claims (4)

1. A lightweight high-strength hemp fiber felt composite polymer foaming reinforced variable thickness composite board, characterized in that the composite board is made of two layers of hemp fiber composite felt (2) and a middle reinforcement layer, the reinforcement layer It is a variable thickness polymer foam reinforcement (3); the hemp fiber composite felt is a polymer-based hemp fiber composite felt; the polymer described in the polymer foam reinforcement (3) is polystyrene, polyurethane, polyester Vinyl chloride, polyethylene, urea-formaldehyde, phenolic or polypropylene. 2. The lightweight high-strength hemp fiber felt composite polymer foamed reinforced variable thickness composite board according to claim 1, characterized in that the polymer is polypropylene. 3. The lightweight high-strength hemp fiber felt composite polymer foamed reinforced variable-thickness composite board according to claim 1, characterized in that the hemp fiber composite felt (2) is a fiber composite made of hemp fiber and polypropylene fiber. felt. 4. The light-weight high-strength hemp fiber felt composite polymer foamed reinforced variable-thickness composite board according to claim 1, characterized in that a surface finish layer (1) is adhered to the outside of the hemp fiber composite felt.