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Sandwich structure composite material and preparation method thereof

A composite material and sandwich structure technology, applied in chemical instruments and methods, electronic equipment, layered products, etc., can solve the difficulty in meeting the diversified design requirements of sandwich structure composite materials, difficult to meet high compressive strength requirements, 3D molding Problems such as complicated process, to achieve the effect of adjustable shrinkage rate, flexible design, and reduced density

Active Publication Date: 2018-08-14
GUANGDONG XINXIU NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the 3D molding process of polymer foam is complicated, and it is difficult to meet the diversified design requirements of sandwich structure composite materials
The typical sandwich structure of three core materials also has the disadvantage of low compressive strength. For example, the compressive strength of polymer foam is less than 10MPa, and the compressive strength of balsa wood is less than 15MPa. It is difficult to meet the requirements of high compressive strength in the field of lightweight structures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The preparation method of sandwich structure composite material of the present invention, it comprises the steps:

[0025] Provide thermoplastics, hollow glass microspheres, compatibilizers, coupling agents, antioxidants, lubricants and discontinuous fibers, as well as continuous fiber reinforced thermoplastic composite sheets, forming fixtures, forming molds and injection molds;

[0026] mixing the thermoplastics, hollow glass microspheres, compatibilizers, coupling agents, antioxidants, lubricants and discontinuous fibers, and then pelletizing to obtain discontinuous fiber-reinforced thermoplastic particles;

[0027]The continuous fiber-reinforced thermoplastic composite material sheet is placed into a molding jig using a vacuum suction cup, and the molding jig is placed between two infrared heaters by a manipulator, and the infrared heater reinforces the continuous fiber The thermoplastic composite material sheet is rapidly heated to the thermoforming temperature, th...

Embodiment 1

[0049] The preparation method of sandwich structure composite material, it comprises the steps:

[0050] Provide thermoplastics, hollow glass microspheres, compatibilizers, coupling agents, antioxidants, lubricants and discontinuous fibers, as well as continuous fiber reinforced thermoplastic composite sheets, molding fixtures, molding molds and injection molds, of which the weight The proportions are as follows: thermoplastic is 60 parts of polycarbonate (PC), 15 parts of hollow glass microspheres, compatibilizer is 3 parts of maleic anhydride grafted styrene / ethylene / styrene block copolymer, silane coupling agent ( KH550) 0.5 parts, antioxidant is antioxidant 1010 and antioxidant 168 mixed at 1:1, 0.2 parts in total; lubricant is silicone masterbatch (ST-LS100) 0.5 parts and glass fiber 20 parts. The length of the glass fiber is 0.7mm. The particle size range of hollow glass microspheres is 10μm~180μm, the median particle size D50 is 60μm, and the true density is 0.45g / cm ...

Embodiment 2

[0057] The preparation method of the sandwich structure composite material described in this embodiment is different from Embodiment 1 in that:

[0058] High performance discontinuous fiber reinforced thermoplastics are made from the following components by weight:

[0059] The thermoplastic is 35 parts of PA, 5 parts of hollow glass microspheres, the compatibilizer is block type styrene-butadiene copolymer, 3 parts of styrene triblock copolymer elastomer combined at 1:1, aluminate couple 1 part of joint agent, 0.7 parts of antioxidant 1076 mixed with antioxidant 168 at a ratio of 2:3, 0.3 parts of lubricant and 0.01 part of carbon fiber. The carbon fiber fibers have a length of 1 mm. The particle size range of the hollow glass microspheres in this example is 10 μm to 180 μm, the median particle size D50 is 45 μm, and the true density is 0.3 g / cm 3 , The compressive strength is 20Mpa.

[0060] Mix thermoplastics, hollow glass microspheres, compatibilizers, coupling agents, ...

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Abstract

The invention relates to a sandwich-structure composite material and a preparation method thereof. The composite material comprises continuous fiber enhanced thermoplastic composite material skin layers, and a non-continuous fiber enhanced thermoplastic plastic injection molding sandwich layer clamped between the continuous fiber enhanced thermoplastic composite material skin layers. The preparation method comprises the following steps: mixing and dicing raw materials of plastic particles to obtain non-continuous fiber enhanced thermoplastic plastic particles; molding continuous fiber enhanced thermoplastic composite material sheet materials into the continuous fiber enhanced thermoplastic composite material skin layers by utilizing a forming die; pre-heating and embedding the two molded continuous fiber enhanced thermoplastic composite material skin layers into an injection molding die; and injecting the non-continuous fiber enhanced thermoplastic plastic particles between the two continuous fiber enhanced thermoplastic composite material skin layers, so as to form the sandwich-structure composite material. The sandwich-structure composite material prepared by the method has high product strength and rigidity, low density and light weight; and weight reduction and thinning are realized, and the sandwich-structure composite material can be used for 3D (Three Dimensional) molding.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a sandwich structure composite material and a preparation method thereof. Background technique [0002] Injection molding technology is one of the main methods of producing discontinuous fiber-reinforced composite materials. The raw materials are generally chopped, long-fiber reinforced thermoplastic composite pellets (LFT) or bulk molding compounds (BMC). The material is fed into the barrel from the hopper, and the material is driven forward by the screw and compacted. At the same time, it is heated and sheared, and gradually plasticized, melted and uniformly mixed. Finally, the material is injected into the mold through the nozzle under high pressure and high speed. In the cavity, the product is obtained after solidification, cooling and shaping. The injection molding process has a long history and is widely used. Its main advantages are short molding cy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/14B32B27/36B32B27/34B32B27/28B32B27/18B29C69/02B29C51/08B29C45/14B29C45/16C08L69/00C08L51/06C08L83/04C08L77/00C08L53/00C08L91/06C08L81/02C08L53/02C08K13/04C08K7/14C08K7/28C08K5/544C08K5/134C08K5/526C08K7/06C08K5/10C08K5/098
CPCB29C45/14508B29C45/1657B29C45/1671B29C51/08B29C69/02B29C2045/14532B29C2045/1454B32B5/16B32B27/14B32B27/18B32B27/28B32B27/34B32B27/365B32B2250/24B32B2250/244B32B2262/02B32B2262/023B32B2262/101B32B2262/103B32B2262/106B32B2264/0264B32B2264/0278B32B2264/101B32B2307/558B32B2307/718B32B2307/72B32B2457/00B32B2605/08C08K2201/003C08L69/00C08L77/00C08L81/02C08L2205/03C08L2205/035C08L2205/08C08L51/06C08L83/04C08K13/04C08K7/14C08K7/28C08K5/544C08K5/1345C08K5/526C08L53/00C08L91/06C08K7/06C08K5/10C08L53/02C08K5/098
Inventor 巫俊斌文峰汪应山
Owner GUANGDONG XINXIU NEW MATERIAL CO LTD
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