Unlock instant, AI-driven research and patent intelligence for your innovation.

A modified fep catheter filled with barium sulfate

A barium sulfate and modified technology, which is applied in the field of filled and modified FEP catheters, can solve problems such as poor dimensional stability, reduced crystallinity, and surface microcracks, and achieve the effects of reducing friction, improving performance, and reducing usage.

Active Publication Date: 2015-11-25
BEIJING PLASTICS RES INST
View PDF5 Cites 0 Cited by
  • 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, and has a trifluoromethyl group (-CF3) in its molecular structure. Therefore, it not only has similar properties to other fluoroplastics It has excellent properties such as wear resistance, acid and alkali resistance, and blood compatibility, and also has good machining properties that other fluoroplastics do not have. However, due to its high viscosity, fast cooling speed, large shrinkage rate, and stable size At the same time, due to its asymmetric molecular structure, its crystallinity is reduced. Therefore, FEP is easily decomposed during processing. When the critical shear rate is exceeded, microcracks will appear on the surface.
Objectively limits its application in the fields of industry, medicine and precision molding

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 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 / T1040-92, the thickness is 2mm, th...

Embodiment 2

[0027] 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 / T1040-92, the thickness is 2mm, the tensile speed is 50mm / min±10%), and the shrinkage rate is 1.8%. FEP catheter is soft, with a tensile strength of 22MPa and an average shrinkage rate of 3.8%. After being modified with a modified barium sulfate masterbatch containing 5μm barium sulfate powder, the tensile strength increases significantly, the shrinkage rate decreases, and the surface of the catheter is smooth. It is uniform white and uniform in color, which can show that the dispersion effect of 5 μm barium s...

Embodiment 3

[0029] 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 / T1040-92, the thickness is 2mm, the tensile speed is 50mm / min±10%)...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melt flow indexaaaaaaaaaa
particle diameteraaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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