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FEP guide tube achieving filling modification with barium sulfate

A barium sulfate modification technology, which is applied in the field of FEP catheters filled with barium sulfate, can solve problems such as poor dimensional stability, lower crystallinity, and surface microcracks, so as to reduce friction, improve performance, and reduce usage. Effect

Active Publication Date: 2014-01-08
BEIJING PLASTICS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Polyfluoroethylene propylene (FEP), referred to as F46, is a copolymer of tetrafluoroethylene and hexafluoroethylene, with a trifluoromethyl group in its molecular structure (-CF3), therefore, it not only has excellent properties such as wear resistance, acid and alkali resistance, and blood compatibility similar to other fluoroplastics, but also has good mechanical processing properties that other fluoroplastics do not have, but due to It has defects such as high viscosity, fast cooling speed, large shrinkage rate, and poor dimensional stability. At the same time, due to its asymmetric molecular structure, its crystallinity is reduced. Therefore, FEP is easily decomposed during processing, exceeding the critical shear. When the speed is high, microcracks will appear on the surface
Objectively limits its application in the fields of industry, medicine and precision molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The weight of each component is 50% of FEP resin with a melt index of 5g / min, 40% of modified barium sulfate masterbatch containing 10μm barium sulfate powder, 2% of titanium dioxide, 7% of perfluorooctanoic acid ammonium, and tris(nonylphenyl) Phosphite 1% preparation. First place FEP resin, modified barium sulfate masterbatch, and ammonium perfluorooctanoate solution containing acetone or ethanol in a low-speed mixer, and stir for 1-2 minutes at normal temperature and pressure, and then mix titanium dioxide and tris(nonylphenyl)phosphite Add and stir at high speed for 10 minutes. Dry the above mixture above 100°C for 1 hour to ensure the overflow of small molecules such as water and ethanol. Under the conditions of the highest extrusion temperature of 360°C and the rotational speed of 10r / min, the FEP conduit was prepared by single-screw extrusion. After measurement, the tensile strength of the pipe is 24MPa (tested according to GB / T 1040-92, the thickness is 2mm, t...

Embodiment 2

[0029] The weight of each component is 30% of FEP resin with a melt index of 3g / min, 40% of FEP resin with a melt index of 8g / min, 25% of modified barium sulfate masterbatch containing 5μm barium sulfate powder, 2% of titanium dioxide, and ammonium perfluorooctanoate 2%, three (nonylphenyl) phosphite 1% preparation. The specific implementation method is the same as Example 1. It has been determined that the tensile strength of the pipe is 25.8MPa (tested according to GB / T 1040-92, the thickness is 2mm, the tensile speed is 50mm / min±10%), the shrinkage rate is 1.8%, and it has not been modified by barium sulfate. The FEP catheter is soft, the tensile strength is 22 MPa, and the average shrinkage rate is 3.8%. After being modified by the modified barium sulfate masterbatch containing 5 μm barium sulfate powder, the tensile strength is obviously increased and the shrinkage rate is reduced. The surface of the catheter Smooth, uniform white, and uniform color, it can show that the...

Embodiment 3

[0031]The parts by weight of each component are 70% of FEP resin with a melt index of 5g / min, 25% of modified barium sulfate masterbatch containing 5μm barium sulfate powder, 2% of titanium dioxide, 2% of ammonium perfluorooctanoate, and dilauryl thiodipropionate 1% preparation. First place FEP resin, modified barium sulfate masterbatch and ammonium perfluorooctanoate solution containing acetone or ethanol in a low-speed mixer, stir for 5 minutes at normal temperature and pressure, then add titanium dioxide and dilauryl thiodipropionate, and stir at high speed 20min. Dry the above mixture above 100°C for 1 hour to ensure the overflow of small molecules such as water and ethanol. Under the conditions of maximum extrusion temperature of 340°C and rotational speed of 20r / min, FEP pipes were prepared by single-screw extrusion. After measurement, the tensile strength of the pipe is 26.6MPa (tested according to GB / T 1040-92, the thickness is 2mm, the tensile speed is 50mm / min±10%)...

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Abstract

The invention relates to an FEP guide tube achieving filling modification with barium sulfate. The FEP guide tube comprises the following components of 50-70% of FEP resin, 30-50% of modified barium sulfate master batches, 1-10 % of dispersing agents, 0.5-5% of pigments and 0.1-2% of antioxygen. Firstly, the FEP resin, the modified barium sulfate master batches and dispersing agent solutions including acetone or ethyl alcohol are placed in a low-speed blender and are stirred for 1-5min at normal temperature and normal pressure, then the pigments and the antioxygen are added, high-speed stirring is carried out for 10-30min, and the FEP guide tube is manufactured through a single screw rod in an extrusion forming mode at 330-380 DEG C within the range of the rotating speed of 10-30r / min. The manufactured FEP guide tube has the good performance of being high in tensile strength, low in shrinking percentage, uniform in color and luster and the like, and meanwhile due to the good diffusion effect of the barium sulfate, the FEP guide tube can have good developing performance by being irradiated by radial light.

Description

technical field [0001] The invention relates to a filled modified FEP catheter, in particular to a modified FEP catheter filled with barium sulfate. Background technique [0002] With the continuous improvement of science and technology and medical level, the application of various polymer materials in the medical industry has developed rapidly. As a special functional polymer material, fluorine-containing materials have excellent mechanical properties, good corrosion resistance, anti-blood coagulation and other advantages, and are widely used in various fields of modern medicine. However, due to the monopoly of foreign technology and the domestic market In recent years, fluorine-containing materials have shown a momentum of rapid development in my country's medical industry, and there is a tendency to gradually replace imports and improve domestic medical products. And this trend is of great significance for promoting the rapid development of my country's medical industry a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L27/20C08K13/06C08K9/00C08K3/30
Inventor 李鑫李海楠王国华黄萍
Owner BEIJING PLASTICS RES INST
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