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A kind of aramid fiber reinforced polypropylene micro-foaming composite material and preparation method thereof

A technology of aramid fibers and composite materials, which is applied in the field of aramid fiber reinforced polypropylene micro-foaming composite materials and its preparation, which can solve the problems of reducing the mechanical properties of foaming materials, small relative density, and foaming, and achieve improved fusion Degree, the effect of suppressing and bubbling

Active Publication Date: 2021-02-26
ORINKO NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polypropylene is a semi-crystalline material with low melt strength and cannot support the growth of cells. It is easy to cause defects such as parallel bubbles and string bubbles. When stressed, it often becomes the birthplace of foam body rupture and reduces the mechanical properties of foamed materials. , restricting the application field of polypropylene
The introduction of fiber reinforcement is one of the more effective ways to ensure that it has better mechanical properties after foaming to meet the requirements of the parts. Glass fibers are mainly used to reinforce polypropylene, and aramid fibers are more durable than glass fibers. It is a new type of high-tech synthetic fiber with superior performance. It has the characteristics of low relative density, ultra-high strength, ultra-high modulus, and good thermal stability. It is widely used in reinforced products, bulletproof fabrics, fibers and cables, etc., but The surface of aramid fibers is smooth and clean, the steric hindrance effect of the benzene ring is large, the chemical active groups are few, the reactivity is low, and the compatibility with the polypropylene matrix is ​​poor, which directly affects the mechanical properties of the composite material

Method used

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  • A kind of aramid fiber reinforced polypropylene micro-foaming composite material and preparation method thereof
  • A kind of aramid fiber reinforced polypropylene micro-foaming composite material and preparation method thereof
  • A kind of aramid fiber reinforced polypropylene micro-foaming composite material and preparation method thereof

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preparation example Construction

[0024] The present invention also provides a method for preparing the aramid fiber reinforced polypropylene micro-foaming composite material, comprising the following steps:

[0025] (1) After the aramid fiber is hydrolyzed, the hydrolyzed aramid fiber is obtained, and then in an inert gas protection atmosphere, the hydrolyzed aramid fiber, isocyanate modifier, and catalyst are heated and refluxed in an organic solvent to obtain a modified aramid fiber 1;

[0026] (2) Reacting the modified aramid fiber 1 and the amino-terminating agent in an organic solvent at 60-80°C for 6-8 hours to obtain the modified aramid fiber 2;

[0027] (3) Mix the modified aramid fiber 2, copolymerized polypropylene, compatibilizer, antioxidant, lubricant and auxiliary agent evenly, then put it into the main feed of the twin-screw extruder, and melt and extrude it to produce Granules to obtain polypropylene composite materials;

[0028] (4) Mixing the polypropylene composite material and foaming ag...

Embodiment 1

[0036] A kind of aramid fiber reinforced polypropylene micro-foaming composite material is made of the following substances by weight:

[0037]

[0038]

[0039] The preparation method of the aramid fiber reinforced polypropylene micro-foaming composite material is as follows:

[0040] (1) Submerge 10 parts by weight of aramid fibers in 500mL of water, then seal and ultrasonically hydrolyze at 60°C for 6h, filter, and vacuum-dry the filtered product at 40°C for 24h to obtain hydrolyzed aramid fibers;

[0041](2) Add the hydrolyzed aramid fibers prepared in step (1), 15 parts by weight of toluene diisocyanate, and 0.075 parts by weight of dibutyltin dilaurate into 200 mL of toluene solution, and then heat and reflux at 90 ° C in a nitrogen atmosphere 4h, then naturally cooled to room temperature, and then centrifuged and washed with a high-speed centrifuge, and the centrifuged product was vacuum-dried at 60°C for 24h to obtain modified aramid fiber 1;

[0042] (3) Modifi...

Embodiment 2

[0046] A kind of aramid fiber reinforced polypropylene micro-foaming composite material is made of the following substances by weight:

[0047]

[0048] The preparation method of the aramid fiber reinforced polypropylene micro-foaming composite material is as follows:

[0049] (1) Submerge 15 parts by weight of aramid fibers in 500 mL of water, then seal and ultrasonically hydrolyze at 80°C for 8 hours, filter, and vacuum-dry the filtered product at 50°C for 36 hours to obtain hydrolyzed aramid fibers;

[0050] (2) Add the hydrolyzed aramid fiber prepared in step (1), 20 parts by weight of toluene diisocyanate, and 0.1 part by weight of dibutyltin dilaurate to 200 mL of toluene solution, and then heat and reflux at 80 ° C in a nitrogen atmosphere 6h, then naturally cooled to room temperature, and then centrifuged and washed with a high-speed centrifuge, and the centrifuged product was vacuum-dried at 50°C for 36 hours to obtain modified aramid fiber 1;

[0051] (3) Modifie...

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Abstract

The invention relates to the technical field of polymer materials, in particular to an aramid fiber-reinforced polypropylene micro-foaming composite material and a preparation method thereof. The aramid fiber-reinforced polypropylene micro-foaming composite material is made of a raw material composition. The raw material composition includes: 74-87 parts of copolymerized polypropylene, 2-5 parts of foaming agent, 3-6 parts of compatibilizer, 10-20 parts of aramid fiber, 15-25 parts of isocyanate modifier, amino sealant 20-30 parts of terminal agent, 0.05-0.1 part of catalyst, 0.2-0.4 part of antioxidant, 0.5-1 part of lubricant, and 0-2 parts of optional additives. The invention improves the degree of fusion between the aramid fiber and polypropylene by adding graft-modified aramid fibers to the polypropylene, and the aramid fibers are distributed in a net shape in the polypropylene and entangled with the polypropylene chain segments , Play the role of skeleton reinforcement, effectively support the growth of cells during the foaming process, inhibit the combination of cells, and obtain fine and uniform polypropylene micro-foamed materials.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to an aramid fiber reinforced polypropylene micro-foaming composite material and a preparation method thereof. Background technique [0002] Polypropylene has the advantages of light weight, high mechanical strength, good thermal stability, and chemical corrosion resistance. It is widely used in automotive door panels, instrument panels, and central passages. Safety, comfort, light weight, and energy saving have become the focus of the development of automotive industrialization. The main trend, the use of lightweight materials is a lightweight technology generally recognized in the industry. Micro-foamed polypropylene has the characteristics of low density, high specific strength, corrosion resistance, etc., and also has the characteristics of sound insulation and noise reduction. Compared with conventional polypropylene materials , The existence of micropores can reduce ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/14C08L77/10C08L51/06C08J9/04
CPCC08J9/0061C08J9/0085C08J9/0095C08J9/04C08J2323/14C08J2451/06C08L77/10
Inventor 石阳阳周海李飞夏洋李荣群
Owner ORINKO NEW MATERIAL CO LTD
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