Preparation method for chopped fiber reinforced thermoplastic composite materials

A technology for reinforcing thermoplastics and chopped fibers, which is applied in fiber types, fiber treatment, textiles and papermaking, etc. It can solve the problems of poor surface activity, poor interface performance, and difficulty in infiltration, and achieve reduced orientation, improved inertness, and increased viscosity. The effect of the ability

Inactive Publication Date: 2015-01-07
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the fiber, especially the carbon fiber with the most promising application prospects, has poor surface activity and strong inertness, it is difficult to infiltrate with many polymers, and the interface performance is poor.

Method used

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  • Preparation method for chopped fiber reinforced thermoplastic composite materials
  • Preparation method for chopped fiber reinforced thermoplastic composite materials
  • Preparation method for chopped fiber reinforced thermoplastic composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Weigh 2 g of the phenolic resin crosslinking precursor and dissolve it in the ethanol solution, stir evenly, and prepare a phenolic resin ethanol coating solution with a total amount of 200 ml and a concentration of 0.05 g / ml;

[0030] 2) Take by weighing 200g of high-density polyethylene short-cut fibers, the fiber length is 500 μm, clean the high-density polyethylene short-cut fibers with acetone in a Soxhlet extraction device for 12 hours, and dry to obtain the dried high-density polyethylene after the acetone treatment. Density polyethylene chopped fibers;

[0031] 3) Then add the prepared phenolic resin ethanol coating solution to the dry high-density polyethylene chopped fibers, compact the chopped high-density polyethylene fibers so that they are all immersed in the phenolic resin ethanol coating solution, and seal Soak for two hours, during this period, open the seal and stir once every 20 minutes, and stir evenly;

[0032] 4) After two hours, place the soak...

Embodiment 2

[0037] 1) Weigh 5 g of the phenolic resin crosslinking precursor and dissolve it in the ethanol solution, stir evenly, and prepare a total amount of 100 ml of novolac ethanol coating solution whose concentration is 0.05 g / ml;

[0038] 2) Take by weighing 100g chopped aramid fiber (poly-p-phenylene terephthalamide fiber), the fiber length is 0.6cm, clean the chopped aramid fiber with acetone in a Soxhlet extraction device for 18 hours, and After being dried, the chopped aramid fibers treated with acetone and dried;

[0039] 3) Then add the prepared novolac ethanol coating solution to the dried chopped aramid fibers, compact the chopped aramid fibers so that they are all immersed in the novolak alcohol coating solution, seal and soak for two hours, During this period, open the seal and stir once every 15 minutes, and stir evenly;

[0040] 4) After two hours, place the soaked chopped aramid fibers in a fume hood to completely volatilize the ethanol. During the volatilization and...

Embodiment 3

[0045] 1) Weigh 10 g of phenolic resin crosslinking precursor and dissolve it in ethanol solution, stir evenly, and prepare a total amount of 100ml of novolac ethanol coating solution with a concentration of 0.1g / ml;

[0046] 2) Weigh 100 g of chopped glass fibers with a fiber length of 500 μm, wash and treat the chopped glass fibers with acetone in a Soxhlet extraction device for 20 hours, and dry to obtain chopped glass fibers treated with acetone and dried;

[0047] 3) Then add the prepared phenolic ethanol coating solution to the dried chopped glass fibers, compact the chopped glass fibers to make them all immersed in the phenolic alcohol coating solution, seal and soak for two hours, during which each Open the seal and stir once every 35 minutes, and stir evenly;

[0048] 4) After two hours, place the soaked chopped glass fibers in a fume hood to completely volatilize the ethanol. During the volatilization and drying process, stir once every 35 minutes to prevent uneven c...

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Abstract

The invention discloses a preparation method for chopped fiber reinforced thermoplastic composite materials. The method comprises the following steps: compounding a phenolic aldehyde ethyl alcohol coating solution of which the concentration is 0.05-0.2g/ml; cleaning and treating the chopped fibers with acetone and drying the cleaned and treated chopped fibers to obtain dried chopped fibers; adding the phenolic aldehyde ethyl alcohol coating solution to the dried chopped fibers, compacting the dried chopped fibers, so that the compacted chopped fibers are completely soaked in the phenolic aldehyde ethyl alcohol coating solution, and soaking the compacted chopped fibers with discontinuous stir; drying the soaked chopped fibers at a room temperature to obtain the dried chopped fibers which are coated with phenolic resin; precuring the dried chopped fibers, and cooling and quickly stirring the precured and dried chopped fibers, so that chopped fiber bundles coated with the phenolic resin on the surface present a decentralized single bundle form; mixing the chopped fibers which present the decentralized single bundle form and a thermoplastic polymer, and then melting and extruding pelleting to obtain the chopped fiber reinforced thermoplastic composite materials. The method has the advantages that the equipment used is simple, the operation is convenient, the energy consumption is low, and the expense is low; the bonding strength of fibers and thermoplastic plastic interface is high, and the coating effect of the phenolic resin to the fibers is good.

Description

technical field [0001] The invention relates to the technical field of fiber surface treatment of novel chopped fiber reinforced thermoplastic composite materials, which is applied to fiber reinforced thermoplastic composite materials, and particularly relates to fiber surface treatment in the field of fiber reinforced thermoplastic composite materials for some fibers that are poorly combined with thermoplastic polymer material interfaces . technical background [0002] Due to its excellent mechanical properties, good corrosion resistance and low thermal expansion coefficient, fibers are widely used in polymer reinforced composites, especially chopped fiber reinforced composites, due to their easy processing, high economic benefits, and filling It bridges the performance gap between continuous fiber reinforced composites and non-reinforced polymer resins, and is widely used in aviation, automobiles, ships and other fields. The performance of short fiber reinforced composite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/06C08J5/08C08L23/06C08L77/10C08L81/06C08L71/08C08K9/04C08K7/14C08K7/06C08K3/04D06M15/41D06M101/20D06M101/36
Inventor 付绍云李飞
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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