Processing method for preparing shape memory product

A processing method and deformation processing technology are applied in the processing field of preparing shape memory products, which can solve the problems of waste, high cost of forming and processing, and complicated procedures.

Pending Publication Date: 2019-12-03
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, if it is necessary to obtain complex-shaped products of different sizes, the above-mentioned traditional processing methods all need to carry out mold design (such as injection molding, compression molding, etc.) 3D printing, laser forming, etc.), it is impossible to realize product processing of multiple sizes through the same size designed mold or model, which not only leads to high cost of forming process, but also complicated process
[0007] Therefore, there is an urgent need for a molding and processing method that simplifies the production of complex-shaped products of different sizes to improve production efficiency, reduce production costs, avoid material waste caused by molds of multiple sizes, and realize green production of polymer materials

Method used

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  • Processing method for preparing shape memory product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] According to the method in the literature "design and synthesis of elastic polycaprolactone based on pendant cyclic ether modification and its application in soft tissue engineering", linear PCT with a mass ratio of CL to TOSUO of 85:15 was prepared, and the synthesis reaction formula is shown in image 3 .

[0056] The synthesis method is mainly as follows: After purifying and drying the comonomer and drying the ampoule for polymerization, weighing the required content of TOSUO and CL into the dried ampoule, adding Required content of Sn(Oct) 2 (One-thousandth of the molar weight of the cyclic monomer) toluene solution and benzyl alcohol, stirring at room temperature and vacuuming, using the azeotropic effect of toluene to remove traces of water in the reaction system, until no bubbles are generated for at least 30 minutes, melt and seal the tube . The tube-locked product was stirred and reacted in an oil bath at 130°C for 24 hours. After the reaction was completed, ...

Embodiment 2

[0061] The thermally induced shape memory linear PCT with crystallinity in Example 1 is used, and its spline thickness is 1.0mm and width is 3.8mm, so that it can be applied to the situation where the installation space is large and the use space is small.

[0062] Stretching 5 mm long splines to 6.5 mm with DMA at 20 °C brought them into a bulky temporary shape. Keep the initial product of stretched splines while cooling down to 0°C, and fix the initial product with a large volume of temporary shape for 4 minutes, and then pass it through a larger installation space. After the initial product is installed in the desired position, it is heated to 40°C to allow it to retract freely, and finally a 5.6mm spline product is obtained.

Embodiment 3

[0064] The thermally induced shape memory linear PCT with crystallinity in Example 1 is used, and its spline thickness is 1.0mm and width is 3.8mm, so that it can be applied to the situation where the installation space is large and the use space is small.

[0065] Stretch 5 mm long splines to 6.5 mm with DMA at 25 °C to bring them into a bulky temporary shape. Keep the initial product of stretched splines while cooling down to 0°C, and fix the initial product with a large volume of temporary shape for 4 minutes, and then pass it through a larger installation space. After the initial product is installed at the desired position, it is heated to 40°C to allow it to retract freely, and finally a 5.5mm spline product is obtained.

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Abstract

According to the scheme, the processing method for preparing a shape memory product comprises the following steps of 1, preparing an initial product with an initial shape by using a thermotropic shapememory polymer material according to a conventional processing method; 2, adjusting the deformation machining temperature according to the size requirement after recovery, deforming the initial product continuously at the temperature till the deformed shape meets the preset requirement, cooling, and obtaining a temporary shape product; and 3, heating the installed temporary shape product, and generating different deformations after the temporary shape product returns from the deformed shape to the initial shape so as to obtain preset shape memory products with different sizes. The invention provides a simple processing method for preparing products with different sizes, which only needs to control the deformation processing temperature and does not need multi-size molds or modeling design. The preparation method is suitable for the thermotropic shape memory polymer with crystallinity and has universality, and the prepared product is particularly suitable for special conditions of larger space range or shape difference during installation and use.

Description

technical field [0001] The invention relates to the technical field of product processing. More specifically, it relates to a processing method for preparing shape memory products. Background technique [0002] Shape memory polymers have been widely used in the fields of electronic communication, biomedicine, machinery manufacturing and aerospace due to their advantages such as light weight and low price, excellent electrical insulation and corrosion resistance, easy processing and shape memory performance, and many other advantages. After shape memory polymer is processed and formed, it can be deformed under certain conditions and reshaped to obtain a secondary shape. After being stimulated by the outside world such as heat, light, electricity, and magnetism, it can be freely restored and "remember" its original shape. Among them, thermotropic shape memory polymer adopts temperature control, the method is simple and practical, and has a wide range of applications. It is cu...

Claims

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Application Information

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IPC IPC(8): B29C61/06
CPCB29C61/06
Inventor 周晶周梓婷孟月王小莺全大萍白莹
Owner SUN YAT SEN UNIV
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