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A kind of manufacturing method of composite modified nylon 12 for laser 3D printing

A 3D printing and composite modification technology, applied in the field of nylon material manufacturing, can solve the problems of limiting the application range of nylon 12, the decrease of material melt fluidity, and the increase of powder molecular weight, so as to improve dyeing performance and electrical performance, and optimize manufacturing Particle size structure, the effect of high overall molecular weight

Active Publication Date: 2022-02-11
GUIZHOU INST OF METALLURGY & CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the special process environment of selective laser sintering (SLS), the raw material powder is kept at a temperature close to the melting point of PA12 (about 183°C) for a long time, and the particle size and surface morphology of some powders are prone to polymerization and crosslinking due to the internal active groups. Therefore, the properties of some 3D printed products of nylon 12, especially the impact toughness, acid and alkali resistance and weather resistance, are not up to the standard. According to the use requirements of the product, this limits the application range of nylon 12 in the field of laser 3D printing
[0003] In the prior art, the mechanical properties of the final product are generally improved by blending modified substances, such as physically blending glass fibers, adding various functional additives, etc. Although such methods can indeed improve the performance in a certain aspect and to a certain extent The performance of the product is improved, but on the one hand, the uniformity of the product is reduced, and it will bring other negative effects. On the other hand, because the material structure of nylon 12 has not been fundamentally changed, all the above-mentioned problems still exist

Method used

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  • A kind of manufacturing method of composite modified nylon 12 for laser 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] ① Mix 1.5kg of vinyltrimethoxysilane with methanol and acetic acid to form a mixed solution with a mass fraction of vinyltrimethoxysilane of 3%-5% and an overall pH value of 3-4, and then add 50nm-100nm Nano-silica with a particle size of 5.3kg, treated with 200W-250W ultrasonic vibration and heated to 50°C-55°C, reacted for 6h-8h to obtain a reaction solution, and dried the reaction solution to obtain the silica to be coupled;

[0024] ②Mix the silica to be coupled with 58kg of polylaurolactam with a molecular weight of 8000-10000 evenly, raise the temperature to 250°C under the protection of 5MPa-6MPa nitrogen and keep stirring, react for 60min-70min, then drop to 3.5MPa-4MPa , heated up to 280°C and kept for 12min-14min to obtain pre-modified molten nylon 12;

[0025] ③ Slowly add 28kg of polypropylene with a molecular weight of 5000-7000 to the pre-modified molten nylon 12, and continue stirring at a rate of 100r / min-120r / min for 30min-35min, and granulate into powd...

Embodiment 2

[0029] The whole is consistent with Example 1, the difference is:

[0030] Raw materials in parts by weight: 60kg of polylaurolactam with a molecular weight of 8000-10000, 25kg of polypropylene with a molecular weight of 3000-8000, 22kg of formic acid, 1kg of dibenzoyl peroxide, 7kg of methyl methacrylate, vinyl trimethylmethacrylate 1kg of oxysilane, 5kg of nano-silica with a particle size of 100nm-200nm;

Embodiment 3

[0032] The whole is consistent with Example 1, the difference is:

[0033] Raw materials in parts by weight: 50kg of polylaurolactam with a molecular weight of 5000-12000, 30kg of polypropylene with a molecular weight of 5000-7000, 25kg of formic acid, 2kg of dibenzoyl peroxide, 9kg of methyl methacrylate, vinyl trimethyl 2kg of oxysilane, 6kg of nano-silica with a particle size of 30nm-50nm;

[0034] Comparing the three embodiments of the present invention with different objects, among them, the performance of the pure new powder 3D printing product without modification is used as a negative control, and the results are shown in the following table:

[0035]

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Abstract

The invention discloses a method for manufacturing composite modified nylon 12 for laser 3D printing. The method is specifically: the raw material polylaurolactam is initially grafted with silica through a coupling agent, and then melted and mixed with polypropylene to form an alloy Modification, and finally by grafting methyl methacrylate again by swelling and expansion, a total of three phase-compatible composite modifications were finally obtained. The invention has moderate particle size, good weather resistance, good toughness, high strength, good suitability for laser 3D printing, and uniform performance.

Description

technical field [0001] The invention relates to the technical field of nylon material manufacturing, in particular to a method for manufacturing composite modified nylon 12 for laser 3D printing. Background technique [0002] Due to the special process environment of selective laser sintering (SLS), the raw material powder is kept at a temperature close to the melting point of PA12 (about 183°C) for a long time, and the particle size and surface morphology of some powders are prone to polymerization and crosslinking due to the internal active groups. Therefore, the properties of some 3D printed products of nylon 12, especially the impact toughness, acid and alkali resistance and weather resistance, are not up to the standard. According to the requirements of the product, this limits the application range of nylon 12 in the field of laser 3D printing. [0003] In the prior art, the mechanical properties of the final product are generally improved by blending modified substan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/02C08L23/12C08K9/06C08K3/36C08F283/04C08F255/02C08F220/14B33Y70/10
CPCC08L77/02C08F283/04C08F255/02B33Y70/00C08K2201/011C08L23/12C08K9/06C08K3/36C08F220/14
Inventor 古文全薛涛吴泽宏孙茂银吴健于云峰梁寅
Owner GUIZHOU INST OF METALLURGY & CHEM ENG
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