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Polyurethane/silicone rubber hybrid material capable of 3D printing and preparation method thereof

A hybrid material, polyurethane technology, applied in the direction of additive processing, can solve the problems of inability to meet the 3D printing conditions, poor mechanical properties, holes in the material, etc., and achieve the effect of good application prospects and excellent mechanical properties.

Active Publication Date: 2022-07-15
CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the silicone rubber currently available on the market is liquid silicone, and most of them cannot meet the conditions for 3D printing.
Most of the polydimethylsiloxane (PDMS) that can meet the processing conditions is high viscosity or non-flowing, and its mechanical properties are poor. After being reinforced with silica, although the mechanical properties are improved, the printing performance is reduced. Moreover, it is better than PDMS in terms of annual height and poor fluidity. It often needs to be diluted with organic solvents, which is potentially toxic, and the material will have holes after the solvent evaporates, which will also affect the mechanical properties of the printed product.

Method used

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  • Polyurethane/silicone rubber hybrid material capable of 3D printing and preparation method thereof
  • Polyurethane/silicone rubber hybrid material capable of 3D printing and preparation method thereof
  • Polyurethane/silicone rubber hybrid material capable of 3D printing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1. Preparation of polysiloxane polyurethane / silicon rubber hybrid material of the present invention

[0045] The preparation method of micro-crosslinked polysiloxane polyurethane is as follows:

[0046] (1) Synthesis of polysiloxane polyurethane:

[0047]Raw material: hydroxyl terminated polymethylsiloxane (molecular weight 2000), H 12 Molar ratio of MDI and hydroxyethyl methacrylate: 1:1.5:1

[0048] The hydroxyl-terminated polymethylsiloxane was compounded with the catalyst organobismuth, and the H 12 In the reaction kettle of MDI, seal the reaction kettle, turn on stirring, and introduce nitrogen to carry out the following process;

[0049] The temperature was raised to 80°C and kept for 4 hours;

[0050] Lower the temperature to 50°C, slowly add hydroxyethyl methacrylate, and keep the temperature for 3 hours;

[0051] (2) Preparation of polyurethane-modified silicone with micro-crosslinked structure

[0052] A vacuum oven was used, the oxygen content w...

Embodiment 2

[0057] Example 2. Preparation of polysiloxane polyurethane material of the present invention

[0058] The preparation of the micro-crosslinked polysiloxane polyurethane is the same as that in Example 1.

[0059] The polysiloxane polyurethane (20phr) is compounded with vinyl silicone oil (100phr), hydrogen-containing silicone oil, silicon dioxide, and curing agent. The specific compounding process is as follows:

[0060] (a). Obtain vinyl silicone oil (100phr) and silicon dioxide (30phr) mixture by Banbury mixer;

[0061] (b). Polysiloxane polyurethane is mixed into the kneaded product of (a) using an open mill.

[0062] (c). Hydrogen-containing silicone oil (0.018phr), platinum catalyst (10ppm), inhibitor 3-butyn-1-ol (addition amount is 1~10% of the total mass of the compound) are mixed into the kneaded product of (b). 2%), and kneading (the temperature does not exceed 60°C) to obtain it.

Embodiment 3

[0063] Embodiment 3, the preparation of polysiloxane polyurethane material of the present invention

[0064] The preparation of the micro-crosslinked polysiloxane polyurethane is the same as that in Example 1.

[0065] The polysiloxane polyurethane (25phr) is compounded with vinyl silicone oil (100phr), hydrogen-containing silicone oil, silicon dioxide, and curing agent. The specific compounding process is as follows:

[0066] (a). Obtain vinyl silicone oil (100phr) and silicon dioxide (40phr) mixture by Banbury mixer;

[0067] (b). Polysiloxane polyurethane is mixed into the kneaded product of (a) using an open mill.

[0068] (c). Hydrogen-containing silicone oil (0.018phr), platinum catalyst (10ppm), inhibitor 3-butyn-1-ol (addition amount is 1~10% of the total mass of the compound) are mixed into the kneading material of (b). 2%), and kneading (the temperature does not exceed 60°C) to obtain it.

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Abstract

The invention provides a polyurethane / silicone rubber hybrid material. The polyurethane / silicone rubber hybrid material is formed by compounding vinyl silicone oil, silicon dioxide and micro-crosslinked vinyl terminated polyurethane, the mass ratio of the vinyl silicone oil to the silicon dioxide to the micro-crosslinked vinyl terminated polyurethane is 100: (30-40): (15-25); the micro-crosslinked vinyl-terminated polyurethane is prepared by enabling vinyl-terminated polyurethane to react for 20 to 30 hours at the temperature of 65 to 75 DEG C under the vacuum pressure of 0.05 to 0.15 MPa. The silicone rubber is compounded with polyurethane with a specific structure and a specific crosslinking degree, so that the rheological property of the silicone rubber is successfully regulated and controlled, and the silicone rubber has the shear thinning rheological property while having excellent mechanical properties, meets the conditions of 3D printing, and has a very good application prospect as 3D printing ink.

Description

technical field [0001] The invention belongs to the field of polymer materials, in particular to a 3D printable polyurethane / silicon rubber hybrid material and a preparation method thereof. Background technique [0002] Additive manufacturing (also known as 3D printing technology) has attracted attention because it can realize rapid prototyping of three-dimensional structures by computer digital simulation, and can improve the processing efficiency of three-dimensional complex components. At present, different 3D printing technologies have different requirements for printing materials. Taking direct-book 3D printing (DIW) as an example, the printing material must meet the rheological conditions of shear thinning, and the existence of yield shear force makes it difficult to When the yield shear force is reached, the material maintains stiffness and is "self-supporting". Therefore, it is necessary to develop special printing materials adapted to specific technical specificati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L75/16C08L83/05C08K3/36B33Y70/10
CPCC08L83/04B33Y70/10C08L2205/025C08L75/16C08K3/36
Inventor 唐昶宇谭鸿徐小博李洁华陈勇前邵虹温金鹏
Owner CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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