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A kind of hardness modifier of TPU powder for sls printing and preparation method thereof

A technology of hardness adjuster and powder, applied in the direction of additive processing, etc., can solve the problems of plasticizer migration, inability to meet, environmental pollution, etc., and achieve the effect of firm interface, uniform blending, and uniform physical properties of the sample

Active Publication Date: 2021-10-29
承德石油高等专科学校 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above method can achieve the purpose of changing polyurethane materials, there are certain limitations in the application of SLS printing
The TPU powder prepared by using a plasticizer to change the hardness will easily cause the plasticizer to migrate out during SLS printing, resulting in a hardness of the finished product that does not match the preset, and the migrated plasticizer will also cause environmental pollution. The method of type and proportion has the problem that the hardness of TPU powder for SLS printing can not be adjusted in a wide range, and it cannot meet the needs of TPU powder for SLS printing with different hardness when printing with high-performance topology or SLS gradient

Method used

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  • A kind of hardness modifier of TPU powder for sls printing and preparation method thereof
  • A kind of hardness modifier of TPU powder for sls printing and preparation method thereof

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Effect test

Embodiment 1

[0033] A method for preparing a hardness regulator of TPU powder for SLS printing in this embodiment comprises the following steps:

[0034] (1) take by weighing 2g particle diameter and be the hydrophilic silica microsphere of 400nm (the SEM figure of described hydrophilic silica microsphere is as follows figure 1 As shown, uniform particle size dispersion) was dissolved in 200ml acetone, ultrasonically dispersed for 30min, and the ultrasonic frequency was 180Hz to form a stable dispersion;

[0035] (2) Weigh 1g of 4,4'-diphenylmethane diisocyanate and add it to the dispersion liquid, continue ultrasonic dispersion for 30min, the ultrasonic frequency is 160Hz, until 4,4'-diphenylmethane diisocyanate is completely Dissolve to obtain mixed solution A;

[0036] (3) Transfer the mixed solution A to a four-necked flask, feed nitrogen to make it in a nitrogen protection atmosphere, then add 0.5g of polyethylene glycol and 0.001g of stannous octoate, stir at room temperature, The ...

Embodiment 2

[0040] A method for preparing a hardness regulator of TPU powder for SLS printing in this embodiment comprises the following steps:

[0041] (1) take by weighing 0.5g particle diameter and be the hydrophilic silica microsphere of 350nm (the SEM figure of described hydrophilic silica microsphere is as follows figure 1 As shown, uniform particle size dispersion) was dissolved in 45ml acetone, the ultrasonic frequency was 160Hz, and ultrasonic dispersion was performed for 25min to form a stable dispersion;

[0042] (2) Weigh 1.5g of 4,4'-diphenylmethane diisocyanate and add it to the dispersion liquid, continue ultrasonic dispersion for 25min, the ultrasonic frequency is 140Hz, until 4,4'-diphenylmethane diisocyanate Dissolve completely to obtain mixed solution A;

[0043] (3) Transfer the mixed solution A to a four-necked flask, feed nitrogen to make it in a nitrogen protection atmosphere, then add 1.25g of polyethylene glycol and 0.0055g of stannous octoate, and stir at room tem...

Embodiment 3

[0047] A method for preparing a hardness regulator of TPU powder for SLS printing in this embodiment comprises the following steps:

[0048] (1) take by weighing 1.25g particle diameter and be the hydrophilic silica microsphere of 450nm (the SEM figure of described hydrophilic silica microsphere is as follows figure 1 As shown, uniform particle size dispersion) was dissolved in 137.5ml acetone, ultrasonically dispersed for 35min, and the ultrasonic frequency was 200Hz to form a stable dispersion;

[0049] (2) Weigh 3g of 4,4'-diphenylmethane diisocyanate and add it to the dispersion liquid, continue ultrasonic dispersion for 35min, the ultrasonic frequency is 180Hz, until 4,4'-diphenylmethane diisocyanate is completely Dissolve to obtain mixed solution A;

[0050] (3) Transfer the mixed solution A to a four-necked flask, feed nitrogen to make it in a nitrogen protection atmosphere, then add 0.3g of polyethylene glycol and 0.01g of stannous octoate, and stir at room temperatur...

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Abstract

The invention relates to a hardness regulator of TPU powder for SLS printing and a preparation method thereof. The hardness regulator prepared by the invention firstly absorbs 4,4'-diphenylmethane diisocyanate on the surface of silica microspheres, Then add polyethylene glycol and stannous octoate to form a coating on the surface of silica, and further add chain extender hydroquinone-bis(β-hydroxyethyl) ether to react, and finally form a complete polyurethane microsphere on the surface of silica microspheres. Capsule layer, TPU microcapsule layer can absorb laser energy during SLS processing and fuse with TPU powder material for SLS printing to form a whole, the interface is stronger, and TPU microcapsule layer can be blended with TPU powder material for SLS printing Uniformity makes the physical properties of SLS printed samples more uniform.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a hardness regulator of TPU powder for SLS printing and a preparation method thereof. Background technique [0002] Selective laser sintering (SLS), as one of the mainstream processes in the 3D printing industry, uses infrared lasers as energy to complete the work of sintering discrete powder layers into a complete entity. The SLS process is one of the most widely used processes for powder material processing. The SLS process can efficiently produce complex samples and retain the excellent mechanical properties of the samples. Thermoplastic polyurethane elastomer (TPU) is a polymer material with properties between rubber and plastics. It has excellent tensile and compression properties. In recent years, it has been widely used in high-end products such as customized shoe soles. [0003] SLS technology produces customized shoe soles, etc. The unique advantag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/10C08K7/18C08L75/04B33Y70/10
CPCB33Y70/10C08K7/18C08K9/10C08L75/04
Inventor 强琳辉田辉陈立海郭永伟刘飞梁释心韩彦龙白涛欧亚菲
Owner 承德石油高等专科学校