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3D printing modified waterborne polyurethane and preparation method thereof

A water-based polyurethane and 3D printing technology, which is applied in the field of polymer materials, can solve the problems of flower oil, edge retention, slow and weak 3D effect, etc.

Inactive Publication Date: 2018-04-03
HUNAN XINLIHUA NANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional water-based polyurethane 3D printing will lose oil and leave edges, and the 3D effect is slow and not strong

Method used

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  • 3D printing modified waterborne polyurethane and preparation method thereof

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preparation example Construction

[0033] refer to figure 1 , the second aspect of the embodiment of the present application shows a preparation method of 3D printing modified water-based polyurethane, comprising the following steps:

[0034] S1 prepolymerization reaction: dehydration of polyol, and then prepolymerization reaction with isocyanate at a mass ratio of 1:2 to obtain polyurethane prepolymer;

[0035] S2 capping reaction: carry out capping reaction with described polyurethane prepolymer and small molecular diol with the mass ratio of 1:2, make the polyurethane of capping;

[0036] S3 chain extension reaction: add acetone to dilute and emulsify the blocked polyurethane, then add an amine chain extender to carry out the chain extension reaction to obtain a polyurethane dispersion;

[0037] S4 removes acetone: removes acetone in the polyurethane dispersion to obtain the water-based polyurethane;

[0038] S5 Mixing and emulsification: put the water-based polyurethane, silane coupling agent and nano-sil...

Embodiment 1

[0049] S1 prepolymerization reaction: dehydrate polyol at 150°C, and then prepolymerize with isocyanate at 100°C at a mass ratio of 1:2 to obtain a polyurethane prepolymer;

[0050] S2 capping reaction: the polyurethane prepolymer and the small molecule diol are subjected to a capping reaction at a mass ratio of 1:2 at 110° C. to obtain a capped polyurethane;

[0051] S3 chain extension reaction: add acetone to dilute and emulsify the end-capped polyurethane, cool down to 25°C, then add methylpentamethylenediamine chain extender to carry out chain extension reaction at 25°C to obtain a polyurethane dispersion;

[0052] S4 removes acetone: removes acetone in the polyurethane dispersion to obtain the water-based polyurethane with a solid content of 65%;

[0053] S5 Mixing and emulsification: put the water-based polyurethane, silane coupling agent and nano-silica into the stirring tank at a mass ratio of 90:7:3 to fully stir and mix. The rotating speed of the stirring tank is 150...

Embodiment 2

[0055] S1 prepolymerization reaction: dehydrate polyol at 120°C, and then carry out prepolymerization reaction with isocyanate at 80°C at a mass ratio of 1:2 to obtain polyurethane prepolymer;

[0056] S2 capping reaction: the polyurethane prepolymer and the small molecule diol are subjected to a capping reaction at a mass ratio of 1:2 at 80° C. to obtain a capped polyurethane;

[0057] S3 chain extension reaction: add acetone to dilute and emulsify the end-capped polyurethane, cool down to 25°C, then add methylpentamethylenediamine chain extender to carry out chain extension reaction at 25°C to obtain a polyurethane dispersion;

[0058] S4 removes acetone: removes the acetone in the polyurethane dispersion to obtain the water-based polyurethane with a solid content of 60%;

[0059] S5 Mixing and emulsification: put the water-based polyurethane, silane coupling agent and nano-silica in a mass ratio of 91:7:2 into a stirring tank and fully stir and mix. The rotation speed of th...

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Abstract

The embodiment of the invention discloses a 3D printing modified waterborne polyurethane and a preparation method thereof. The modified waterborne polyurethane comprises the following components in percent by mass: 60-94% of waterborne polyurethane, 5-10% of a silane coupling agent and 1-3% of nanometer silicon dioxide. The preparation method of the modified waterborne polyurethane comprises the following steps: dehydrating polyol, and then carrying out a prepolymerization reaction between the dehydrated polyol and isocyanate to obtain a polyurethane prepolymer; carrying out an end-capping reaction between the polyurethane prepolymer and small molecular diol, adding acetone for diluting and emulsifying, and then adding an amine chain extender for a chain extension reaction to obtain a polyurethane dispersion; removing the acetone in the polyurethane dispersion to obtain the waterborne polyurethane; putting the waterborne polyurethane, the silane coupling agent and the nanometer silicondioxide into a stirring kettle according to a mass ratio, sufficiently mixing, adding an emulsifier, and emulsifying to obtain the modified waterborne polyurethane. Through addition of the nanometersilicon dioxide for modifying the waterborne polyurethane, the pressure resistance is improved and a net structure is increased, so that the 3D printing effect can be enhanced and no collapse exists during 3D printing.

Description

technical field [0001] The present application relates to the field of polymer materials, in particular to a 3D printing modified waterborne polyurethane and a preparation method thereof. Background technique [0002] The environmentally friendly digital printing process has the advantages of energy saving and emission reduction, bright colors, high precision and good hand feeling. Its advanced production principles and technical measures have brought new concepts and unprecedented opportunities to the textile printing industry. my country's digital printing started late, and advanced digital printing machines are imported from abroad, and the corresponding digital printing ink consumables have always relied on foreign imports due to their high quality requirements. For digital printing ink, a certain amount of wastewater will be generated in the process of pre-treatment sizing and post-treatment washing, and all current digital printing inks have low covering rate, poor thr...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08K5/54C08K3/36C08G18/10C08G18/32
CPCC08G18/10C08K3/36C08K5/54C08L75/04C08G18/3228
Inventor 詹国胜范友华
Owner HUNAN XINLIHUA NANO TECH
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