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Low-temperature thermoplastic sheet material and preparation method thereof

A low-temperature thermoplastic and plate technology, applied in the field of medical devices, can solve the problems of local mechanical strength and decrease of material inhomogeneity, and achieve the effect of good fixing effect, strong comfort and consistent mechanical strength.

Active Publication Date: 2019-04-12
WEIGAO HLDG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for inorganic fillers to disperse uniformly in PCL, which will lead to the inhomogeneity of the material and the decrease of local mechanical strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] The present invention also provides a method for preparing the above-mentioned low-temperature thermoplastic plate, comprising: A) mixing 80-95 parts by weight of polycaprolactone, 5-20 parts by weight of polylactic acid and 2-4 parts by weight of coupling agent After melting, reaction, blending and extruding, irradiation treatment is performed to obtain a low-temperature thermoplastic sheet.

[0037] According to the present invention, the polycaprolactone is preferably dried first to obtain the dried polycaprolactone; the temperature of the drying treatment is preferably 40° C. to 55° C.; the drying treatment time is preferably is 4 to 6 hours; the polylactic acid is preferably dried first to obtain the dried polylactic acid; the temperature of the drying treatment is preferably 40°C to 55°C; the drying time is preferably 4 to 50°C. 6h.

[0038] The dried polycaprolactone, the dried polylactic acid and the coupling agent are preferably mixed first, then melted, react...

Embodiment 1

[0043] Dry 95 parts by weight of polycaprolactone (Mn=50000g / mol) and 5 parts by weight of polylactic acid (Mn=30000g / mol) at 50°C for 4 hours, add 2 parts by weight of isophorone diisocyanate, and stir in a high-speed mixer 10min to make it mix evenly, and then add it to a twin-screw extruder for melt reaction and extrusion. Set the temperature of the extruder along the direction from the feeding port to the die to be 110-160°C, the die temperature to be 135°C, carry out melt reaction blending at a speed of 80rpm, and extrude to obtain a plate with a thickness of 2.4mm; use a dose of 50kGy to carry out Electron beam irradiation to obtain low temperature thermoplastic sheet.

[0044] The low-temperature thermoplastic sheet obtained in Example 1 was tested for elastic modulus, deformation recovery rate and shrinkage force, and the results are listed in Table 1.

Embodiment 2

[0046] Dry 80 parts by weight of polycaprolactone (Mn=30000g / mol) and 20 parts by weight of polylactic acid (Mn=20000g / mol) at 50°C for 4 hours, add 4 parts by weight of isophorone diisocyanate, and stir in a high-speed mixer 10min to make it mix evenly, and then add it to a twin-screw extruder for melt reaction and extrusion. Set the temperature of the extruder along the direction from the feeding port to the die to be 130-180°C, the die temperature to be 150°C, and carry out melt reaction blending at a speed of 100rpm to obtain a plate with a thickness of 3.2mm; use a dose of 200kGy for electron beam Irradiate to obtain a low-temperature thermoplastic sheet.

[0047] The low-temperature thermoplastic sheet obtained in Example 2 was tested for elastic modulus, deformation recovery rate and shrinkage force, and the results are listed in Table 1.

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Abstract

The invention relates to the field of medical apparatus and instruments, specifically to a low-temperature thermoplastic sheet material, and a preparation method and an application thereof. The low-temperature thermoplastic sheet material provided by the invention is prepared from 80 to 95 parts by weight of polycaprolactone, 5 to 20 parts by weight of polylactic acid and 2 to 4 parts by weight ofa coupling agent through a melting reaction, blend extrusion molding and irradiation crosslinking. According to the invention, a high-modulus polylactic acid material is introduced into a main body material of the low-temperature thermoplastic sheet material provided by the invention, so the low-temperature thermoplastic sheet material has higher strength, small degree of retraction and deformation, better fixing effect and stronger comfortable sensation; and after the low-temperature thermoplastic sheet material is discarded, the rate of degradation is rapider. Meanwhile, the low-temperaturethermoplastic sheet material adopts a manner of chemical coupling to further improve the compatibility between the polylactic acid and a polycaprolactone material, and the polylactic acid and the polycaprolactone material are uniformly distributed in the whole bulk structure, so uniform mechanical strength of all parts of the sheet material is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of medical devices, in particular to a low-temperature thermoplastic plate and a preparation method thereof. Background technique [0002] In the process of radiotherapy, in order to achieve auxiliary positioning and fixation of tumor patients, reduce unnecessary damage to normal tissues caused by patient body movement, and improve the absorption of radiation by local lesions, radiotherapy positioning membranes are required. [0003] Clinical treatment of various fractures and patients after orthopedic surgery requires external fixation. Although ordinary gypsum and other materials have been used as orthopedic external fixation materials for many years, they are poor in comfort, airtight, X-ray impermeable, and easy to break. Recently, a fracture fixation plate that is high in strength, soft and comfortable, transparent to X-rays, easy to observe bone healing, and detachable at any time has been widely circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K5/29C08J3/28
CPCC08J3/28C08L67/04C08J2367/04C08L2201/06C08L2205/025C08J2467/04C08K5/29
Inventor 尹立刚陈家悦宋修山尹云山马才姜响鹏
Owner WEIGAO HLDG
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