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Method for preparing high-strength cast nylon product

A casting nylon, high-strength technology, applied in the field of polymer material molding, can solve the problems of destroying fiber orientation, inability to melt and process reinforcements, etc., and achieve improved modulus and impact resistance, good recyclability, equipment less demanding effects

Inactive Publication Date: 2021-06-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But inorganic reinforcements have a major disadvantage: they are difficult to recycle because they cannot be melted and processed into new products by shredding and melting them again
But so far, the processing of this new material usually requires complex procedures and strict temperature control during processing to avoid disrupting the orientation of the fibers.

Method used

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  • Method for preparing high-strength cast nylon product
  • Method for preparing high-strength cast nylon product
  • Method for preparing high-strength cast nylon product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Utilize a kind of method for preparing high-strength cast nylon product of the present invention, prepare dumbbell-shaped tensile sample product, comprise following specific steps:

[0029] 1) Prepare an appropriate amount of commercial nano-ferric oxide powder, and put it into a vibrating sieve equipped with a 10,000-mesh screen. After fully sieving, keep the undersize for use; the oversize can be collected and passed through grinding Recycling after machine grinding;

[0030] 2) Add 9.6 kg of fully dried nylon 6 granules and 0.4 kg of nano iron ferric oxide powder sieved in the previous step into a plastic mixer, and mix well.

[0031] 3) Put the particles mixed uniformly in the previous step into the melt electrospinning machine fed by the screw, set the spinning voltage to 30KV, the receiving distance to 110mm, and the barrel temperature to 300°C for spinning to obtain ferric oxide mixed with Powdered Nylon 6 fine fibers.

[0032] 4) if figure 1 As shown, the fib...

Embodiment 2

[0039] The difference from Example 1 is that this example uses a method for preparing high-strength cast nylon products of the present invention to prepare elongated impact sample products, including the following specific steps:

[0040] 1) Prepare an appropriate amount of commercial nano-ferric oxide powder, and put it into a vibrating sieve equipped with a 10,000-mesh screen. After fully sieving, keep the undersize for use; the oversize can be collected and passed through grinding Recycling after machine grinding;

[0041] 2) Add 8Kg of fully dried nylon 6 granules and 2kg of nano iron ferric oxide powder sieved in the previous step into a plastic mixer, and mix well.

[0042] 3) Put the particles mixed uniformly in the previous step into the melt electrospinning machine fed by the screw, set the spinning voltage to 30KV, the receiving distance to 110mm, and the barrel temperature to 300°C for spinning to obtain ferric oxide mixed with Powdered Nylon 6 fine fibers.

[004...

Embodiment 3

[0049] The difference from Example 1 is that this example uses a method for preparing high-strength cast nylon products of the present invention to prepare cylindrical compression sample products, including the following specific steps:

[0050] 1) Prepare an appropriate amount of commercial nano-ferric oxide powder, and put it into a vibrating sieve equipped with a 10,000-mesh screen. After fully sieving, keep the undersize for use; the oversize can be collected and passed through grinding Recycling after machine grinding;

[0051] 2) Add 9Kg of fully dried nylon 6 granules and 1Kg of nano iron ferric oxide powder sieved in the previous step into a plastic mixer, and mix well.

[0052] 3) Put the particles mixed uniformly in the previous step into the melt electrospinning machine fed by the screw, set the spinning voltage to 30KV, the receiving distance to 110mm, and the barrel temperature to 300°C for spinning to obtain ferric oxide mixed with Powdered Nylon 6 fine fibers. ...

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Abstract

The invention provides a method for preparing a high-strength cast nylon product, which comprises the following steps of: mixing nylon particles with a certain amount of nano iron oxide magnetic powder, spinning by utilizing melt electrostatic spinning, directionally winding the fibers on a plate, and magnetizing in a high-intensity magnetic field environment to endow the fibers with certain magnetism; cutting the magnetized fibers into magnetized short fibers with a certain length; and uniformly dispersing the magnetized short fibers in a caprolactam solution added with a basic catalyst and a caprolactam solution added with an activating agent respectively to serve as a component A and a component B for reaction injection molding, fully mixing the two solutions A and B and injecting the mixed solution into a specially-designed mold through a reaction injection molding machine, and in a mold cavity, under the action of a magnetic field, heating a mold to the temperature lower than the melting point of nylon to cure caprolactam, and finally, obtaining a product. The fibers which are directionally arranged under the action of the magnetic field enables the mechanical property of the composite material in the stress direction to be greatly improved.

Description

technical field [0001] The invention belongs to the field of polymer material molding, and in particular relates to a method for preparing high-strength cast nylon products. Background technique [0002] Cast nylon is made of molten caprolactam monomer under normal pressure with an alkaline substance as a catalyst, together with activators and other additives to make monomers to be polymerized, and directly injected into a mold preheated to a certain temperature, so that The material undergoes a polymerization reaction quickly in the mold, condenses into a tough solid blank, and then undergoes relevant process processing to obtain the predetermined product. As one of the engineering plastics, cast nylon products are "replacing steel with plastic with excellent performance" and have a wide range of uses. It has many unique properties such as light weight, high strength, self-lubricating, wear-resistant, anti-corrosion, insulation, etc. It is an engineering plastic widely use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/04C08L77/02C08K7/08B29C35/08
CPCC08J5/046B29C35/0805C08J2377/02C08J2477/02C08K7/08B29C2035/0855
Inventor 谢鹏程宋乐丁玉梅杨卫民
Owner BEIJING UNIV OF CHEM TECH
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