CN117248299B - High-hydrophobicity lubricating polypropylene medical monofilament and preparation method thereof - Google Patents
High-hydrophobicity lubricating polypropylene medical monofilament and preparation method thereof Download PDFInfo
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- 239000004743 Polypropylene Substances 0.000 title abstract description 120
- -1 polypropylene Polymers 0.000 title abstract description 120
- 229920001155 polypropylene Polymers 0.000 title abstract description 120
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 230000001050 lubricating effect Effects 0.000 title abstract description 4
- 229920005989 resin Polymers 0.000 abstract description 86
- 239000011347 resin Substances 0.000 abstract description 86
- 229920002545 silicone oil Polymers 0.000 abstract description 49
- 229920002554 vinyl polymer Polymers 0.000 abstract description 25
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 abstract description 17
- 239000010410 layer Substances 0.000 abstract description 5
- 238000001125 extrusion Methods 0.000 abstract description 3
- 239000012792 core layer Substances 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 34
- 238000000034 method Methods 0.000 description 33
- 239000000843 powder Substances 0.000 description 19
- 238000009998 heat setting Methods 0.000 description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 239000000463 material Substances 0.000 description 16
- 239000008187 granular material Substances 0.000 description 9
- 230000001678 irradiating effect Effects 0.000 description 9
- 238000005096 rolling process Methods 0.000 description 9
- 239000007788 liquid Substances 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 238000010298 pulverizing process Methods 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 238000012216 screening Methods 0.000 description 8
- 238000009987 spinning Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000007943 implant Substances 0.000 description 6
- 229920002050 silicone resin Polymers 0.000 description 4
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002715 modification method Methods 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 150000003384 small molecules Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010061218 Inflammation Diseases 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 125000002081 peroxide group Chemical group 0.000 description 1
- 125000000864 peroxy group Chemical group O(O*)* 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/06—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyolefin as constituent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F299/00—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
- C08F299/02—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates
- C08F299/08—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates from polysiloxanes
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/34—Core-skin structure; Spinnerette packs therefor
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/10—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one other macromolecular compound obtained by reactions only involving carbon-to-carbon unsaturated bonds as constituent
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Abstract
The invention discloses a high-hydrophobicity lubricating polypropylene medical monofilament and a preparation method thereof, wherein the monofilament structure of the product is of a sheath-core structure, a core layer is polypropylene resin, a sheath layer is silicone oil modified polypropylene resin, the diameter of the monofilament is 0.1-0.3 mm, and the thickness of the sheath layer is 0.02 mm; the silicone oil modified polypropylene resin is prepared by reactive extrusion of vinyl silicone oil and pre-irradiation polypropylene resin, wherein the mass percentage of the vinyl silicone oil is 3-15%. The invention effectively reduces the surface energy of the monofilament and improves the lubricity of the surface of the monofilament.
Description
Technical Field
The invention relates to a polypropylene medical monofilament and a preparation method thereof.
Background
The polypropylene monofilament is biologically inert, low in cost and convenient to process and form, and is widely used as medical implantable materials such as surgical suture lines, medical patches and the like. However, because of the rough surface of the polypropylene fiber and the higher surface energy, the implanted polypropylene monofilament fabric is easy to adhere to tissues, so that local tissues are subjected to inflammatory reaction. And once the material is adhered to the tissue, the implanted material is difficult to take out in the secondary operation, and the tissue is easy to damage. Therefore, the polypropylene-based implant material can be prevented from adhering to tissues in the long-term use process, and has positive effects of reducing pain of patients. An effective method for inhibiting adhesion between the implant material and the tissue is to reduce the surface energy of the material, improve the hydrophobicity and the surface lubricity of the implant material, for example, the implant material woven by PVDF monofilaments has good anti-adhesion effect, and the silicone resin is used as the implant material for a long time, besides the biological inertia and the elasticity of the silicone resin, the surface of the silicone resin is smooth and anti-adhesion. However, the mechanical properties of materials such as silicone resin or PVDF are insufficient, and the use requirements of application scenes with higher mechanical properties are generally difficult to meet.
Therefore, the surface energy of the polypropylene monofilament can be reduced and the surface lubricity of the polypropylene monofilament can be improved on the premise of keeping the original performance of the polypropylene monofilament by carrying out high-hydrophobicity modification on the polypropylene monofilament. The conventional method is to graft or coat hydrophobic materials on the surface of polypropylene monofilament to achieve the effect of improving the hydrophobicity. However, the grafting method is complicated and is only suitable for laboratory researches, the coating method has a certain application value, but the surface of the polypropylene monofilament does not have an active site, the coating layer and the monofilament have no strong interaction, the coating layer is easy to fall off in the post-processing process, the local hydrophobicity is lost, and the product quality is uncontrollable. In addition, the modification method generally needs to use solvents, initiators and other small molecule chemicals, and the existence of the small molecule chemicals can not ensure that the modified materials can be applied to the medical field.
Disclosure of Invention
The invention aims to provide a high-hydrophobicity lubricating polypropylene medical monofilament capable of effectively reducing the surface energy of the monofilament and improving the lubricity of the surface of the monofilament and a preparation method thereof.
The technical scheme of the invention is as follows:
A medical monofilament of high-hydrophobicity lubricated polypropylene is characterized in that the monofilament has a sheath-core structure, a core layer is polypropylene resin, a sheath layer is silicone oil modified polypropylene resin, the diameter of the monofilament is 0.1-0.3 mm, and the thickness of the sheath layer is 0.02 mm; the silicone oil modified polypropylene resin is prepared by reactive extrusion of vinyl silicone oil and pre-irradiation polypropylene resin, wherein the mass percentage of the vinyl silicone oil is 3-15%;
the pre-irradiation polypropylene resin is prepared by the following method: the method comprises the steps of firstly, freezing and crushing polypropylene resin granules to obtain polypropylene resin powder, and pre-irradiating the polypropylene resin powder with the irradiation dose of 20-60 kGy under the air atmosphere by adopting 60 Co or an electron accelerator as an irradiation source to obtain the pre-irradiated polypropylene resin.
The polypropylene resin is medical isotactic polypropylene resin, and the isotacticity is more than 97%.
The vinyl silicone oil is one of vinyl-terminated silicone oil and polyvinyl silicone oil, the mass percentage content of vinyl in the polyvinyl silicone oil is 5-10%, and the viscosity of the vinyl silicone oil is 30-200 cst.
The preparation method of the medical polypropylene monofilament with high hydrophobicity is characterized by comprising the following steps:
Step one: adding the polypropylene resin granules into an ultralow temperature pulverizer, cooling by liquid nitrogen, reducing the temperature to-150 ℃, and pulverizing and screening at low temperature to obtain polypropylene resin powder with the particle size lower than 10 meshes. Pre-irradiating polypropylene resin powder by using 60 Co as an irradiation source under the air atmosphere, wherein the pre-irradiation dosage range is 20-60 kGy, so as to obtain pre-irradiated polypropylene resin;
or adopting an electron accelerator as an irradiation source, and pre-irradiating the polypropylene resin powder by using beta rays in an air atmosphere, wherein the pre-irradiation dosage range is 20-60 kGy, so as to obtain pre-irradiated polypropylene resin;
step two: adding the pre-irradiation polypropylene resin prepared in the step one and vinyl silicone oil into a double-screw extruder according to the mass fraction ratio of (85-95) (5-15), and extruding and granulating by the double-screw extruder at the temperature of 130-200 ℃ to obtain silicone oil modified polypropylene resin;
the mass percentage of the vinyl silicone oil is 3-15%;
step three: and (3) extruding the silicone oil modified polypropylene resin prepared in the step two and the polypropylene resin raw material by a skin-core spinning method through a single screw extruder at 200-210 ℃, cooling, stretching, heat setting and rolling to obtain the skin-core structure high-hydrophobicity polypropylene medical monofilament.
The polypropylene resin in the step two is medical grade isotactic polypropylene resin, and the isotacticity is more than 97%.
In the second step, the vinyl silicone oil is one of vinyl-terminated silicone oil and polyvinyl silicone oil, the viscosity is 30-200 cst, and the mass percentage content of vinyl in the polyvinyl silicone oil is 5-10%.
In the third step, the cooling method is water cooling, the cooling temperature is 12 ℃, the stretching method is secondary stretching, the primary stretching ratio is 4, the secondary stretching ratio is 1.2, and the heat setting temperature is 160 ℃.
In the third step, the diameter of the high-hydrophobicity polypropylene medical monofilament is 0.1-0.3 mm.
According to the invention, the surface energy of the polypropylene monofilament is reduced, the surface hydrophobicity and smoothness of the monofilament are improved, the adhesion between the medical implant material based on the polypropylene monofilament and tissues can be effectively inhibited, the conventional modification method is not suitable for industrialization, or the residual of small molecular chemical reagent exists in the modified material, so that the medical purpose of the material cannot be realized.
The beneficial effects of the invention are that:
1. The invention firstly introduces peroxy groups on a macromolecular chain of polypropylene resin by utilizing a pre-irradiation mode. The peroxide group is decomposed to generate free radical at high temperature through reactive extrusion, so that the reaction between vinyl in the vinyl silicone oil and the polypropylene resin is initiated, and the silicone oil modified polypropylene graft is prepared. The method has the advantages that no additive is introduced, the material cleanness is ensured, and the medical requirements are met;
2. The silicone oil molecules are grafted on a polypropylene long chain, and the incompatibility of the silicone oil and the polypropylene is utilized, so that the silicone oil of the skin layer migrates to the surface of the polypropylene monofilament in the processing process, the surface energy of the monofilament is reduced, and the hydrophobicity and the smoothness of the surface of the monofilament are improved.
3. Because the silicone oil is covalently combined with the polypropylene, the silicone oil does not fall off, and the stability of the monofilament in the subsequent processing and using processes is ensured.
The invention is further illustrated below with reference to examples.
Detailed Description
Example 1
Step one: adding the polypropylene resin granules into an ultralow temperature pulverizer, cooling by liquid nitrogen, reducing the temperature to-150 ℃, and pulverizing and screening at low temperature to obtain polypropylene resin powder with the particle size lower than 10 meshes. Using 60Co as an irradiation source, and pre-irradiating the polypropylene resin powder by using gamma rays in an air atmosphere, wherein the pre-irradiation dose is 20 kGy, so as to obtain pre-irradiated polypropylene resin;
Step two: extruding and granulating the pre-irradiation polypropylene resin prepared in the step one and vinyl-terminated silicone oil with the viscosity of 50 cst according to the mass ratio of 90:3 by a double-screw extruder to obtain silicone oil modified polypropylene resin;
Step three: and (3) extruding the silicone oil modified polypropylene resin prepared in the step two and the polypropylene resin raw material by a sheath-core spinning method through a single screw extruder at 200 ℃, cooling, stretching, heat setting and rolling to obtain the sheath-core structure high-hydrophobicity polypropylene medical monofilament with the diameter of 0.1 mm. The specific process adopts a water cooling mode, the cooling temperature is 12 oC, the stretching method is secondary stretching, the primary stretching ratio is 4, the secondary stretching ratio is 1.2, and the heat setting temperature is 160 oC.
Monofilament strength: 5 cN/dtex; contact angle 103 °; coefficient of friction: 0.36.
Example 2
Step one: adding the polypropylene resin granules into an ultralow temperature pulverizer, cooling by liquid nitrogen, reducing the temperature to-150 ℃, and pulverizing and screening at low temperature to obtain polypropylene resin powder with the particle size lower than 10 meshes. Using 60Co as an irradiation source, and pre-irradiating the polypropylene resin powder by using gamma rays in an air atmosphere, wherein the pre-irradiation dose is 60 kGy, so as to obtain pre-irradiated polypropylene resin;
step two: extruding and granulating the pre-irradiation polypropylene resin prepared in the step one and vinyl-terminated silicone oil with the viscosity of 200 cst by a double-screw extruder according to the mass ratio of 90:3 to obtain silicone oil modified polypropylene resin;
Step three: and (3) extruding the silicone oil modified polypropylene resin prepared in the step two and the polypropylene resin raw material by a sheath-core spinning method through a single screw extruder at 210 ℃, cooling, stretching, heat setting and rolling to obtain the sheath-core structure high-hydrophobicity polypropylene medical monofilament with the diameter of 0.1 mm. The specific process adopts a water cooling mode, the cooling temperature is 12 oC, the stretching method is secondary stretching, the primary stretching ratio is 4, the secondary stretching ratio is 1.2, and the heat setting temperature is 160 oC.
Monofilament strength: 4.7 cN/dtex; contact angle 107 °; coefficient of friction: 0.31.
Example 3
Step one: adding the polypropylene resin granules into an ultralow temperature pulverizer, cooling by liquid nitrogen, reducing the temperature to-150 ℃, and pulverizing and screening at low temperature to obtain polypropylene resin powder with the particle size lower than 10 meshes. Using 60Co as an irradiation source, and pre-irradiating the polypropylene resin powder by using gamma rays in an air atmosphere, wherein the pre-irradiation dose is 30 kGy, so as to obtain pre-irradiated polypropylene resin;
step two: extruding and granulating the pre-irradiation polypropylene resin prepared in the step one and the polyvinyl silicone oil with the viscosity of 30 cst percent and the vinyl mass percent of 5 percent by a double-screw extruder according to the mass ratio of 90:10 to obtain silicone oil modified polypropylene resin;
Step three: and (3) extruding the silicone oil modified polypropylene resin prepared in the step two and the polypropylene resin raw material by a sheath-core spinning method through a single screw extruder at 205 ℃, cooling, stretching, heat setting and rolling to obtain the sheath-core structure high-hydrophobicity polypropylene medical monofilament with the diameter of 0.1 mm. The specific process adopts a water cooling mode, the cooling temperature is 12 oC, the stretching method is secondary stretching, the primary stretching ratio is 4, the secondary stretching ratio is 1.2, and the heat setting temperature is 160 oC.
Monofilament strength: 4.4 cN/dtex; contact angle 113 °; coefficient of friction: 0.24.
Example 4
Step one: adding the polypropylene resin granules into an ultralow temperature pulverizer, cooling by liquid nitrogen, reducing the temperature to-150 ℃, and pulverizing and screening at low temperature to obtain polypropylene resin powder with the particle size lower than 10 meshes. Using an electron accelerator as an irradiation source, and pre-irradiating polypropylene resin powder with beta rays under the air atmosphere, wherein the pre-irradiation dose is 50 kGy, so as to obtain pre-irradiated polypropylene resin;
Step two: extruding and granulating the pre-irradiation polypropylene resin prepared in the step one and the polyvinyl silicone oil with the viscosity of 100 cst and the vinyl mass percent of 10 percent by a double-screw extruder according to the mass ratio of 90:15 to obtain silicone oil modified polypropylene resin;
Step three: and (3) extruding the silicone oil modified polypropylene resin prepared in the step two and the polypropylene resin raw material by a sheath-core spinning method through a single screw extruder at 210 ℃, cooling, stretching, heat setting and rolling to obtain the sheath-core structure high-hydrophobicity polypropylene medical monofilament with the diameter of 0.1 mm. The specific process adopts a water cooling mode, the cooling temperature is 12 oC, the stretching method is secondary stretching, the primary stretching ratio is 4, the secondary stretching ratio is 1.2, and the heat setting temperature is 160 oC.
Monofilament strength: 4.0 cN/dtex; contact angle 117 °; coefficient of friction: 0.11.
Example 5
Step one: adding the polypropylene resin granules into an ultralow temperature pulverizer, cooling by liquid nitrogen, reducing the temperature to-150 ℃, and pulverizing and screening at low temperature to obtain polypropylene resin powder with the particle size lower than 10 meshes. Using 60Co as an irradiation source, and pre-irradiating the polypropylene resin powder by using gamma rays in an air atmosphere, wherein the pre-irradiation dose is 30 kGy, so as to obtain pre-irradiated polypropylene resin;
Step two: extruding and granulating the pre-irradiation polypropylene resin prepared in the step one and the polyvinyl silicone oil with the viscosity of 200 cst and the vinyl mass percent of 7.5 by a double-screw extruder according to the mass ratio of 90:10 to obtain silicone oil modified polypropylene resin;
Step three: and (3) extruding the silicone oil modified polypropylene resin prepared in the step two and the polypropylene resin raw material by a sheath-core spinning method through a single screw extruder at 200 ℃, cooling, stretching, heat setting and rolling to obtain the sheath-core structure high-hydrophobicity polypropylene medical monofilament with the diameter of 0.1 mm. The specific process adopts a water cooling mode, the cooling temperature is 12 oC, the stretching method is secondary stretching, the primary stretching ratio is 4, the secondary stretching ratio is 1.2, and the heat setting temperature is 160 oC.
Monofilament strength: 4.3 cN/dtex; contact angle 116 °; coefficient of friction: 0.16.
Example 6
Step one: adding the polypropylene resin granules into an ultralow temperature pulverizer, cooling by liquid nitrogen, reducing the temperature to-150 ℃, and pulverizing and screening at low temperature to obtain polypropylene resin powder with the particle size lower than 10 meshes. Using an electron accelerator as an irradiation source, and pre-irradiating polypropylene resin powder with beta rays under the air atmosphere, wherein the pre-irradiation dose is 30 kGy, so as to obtain pre-irradiated polypropylene resin;
step two: extruding and granulating the pre-irradiation polypropylene resin prepared in the step one and the polyvinyl silicone oil with the viscosity of 30 cst percent and the vinyl mass percent of 5 percent by a double-screw extruder according to the mass ratio of 90:10 to obtain silicone oil modified polypropylene resin;
Step three: and (3) extruding the silicone oil modified polypropylene resin prepared in the step two and the polypropylene resin raw material by a sheath-core spinning method through a single screw extruder at 205 ℃, cooling, stretching, heat setting and rolling to obtain the sheath-core structure high-hydrophobicity polypropylene medical monofilament with the diameter of 0.3 mm. The specific process adopts a water cooling mode, the cooling temperature is 12 oC, the stretching method is secondary stretching, the primary stretching ratio is 4, the secondary stretching ratio is 1.2, and the heat setting temperature is 160 oC.
Monofilament strength: 4.0 cN/dtex; contact angle 113 °; coefficient of friction: 0.24.
Example 7
Step one: adding the polypropylene resin granules into an ultralow temperature pulverizer, cooling by liquid nitrogen, reducing the temperature to-150 ℃, and pulverizing and screening at low temperature to obtain polypropylene resin powder with the particle size lower than 10 meshes. Using an electron accelerator as an irradiation source, and pre-irradiating polypropylene resin powder with beta rays under the air atmosphere, wherein the pre-irradiation dose is 60 kGy, so as to obtain pre-irradiated polypropylene resin;
step two: extruding and granulating the pre-irradiation polypropylene resin prepared in the step one and vinyl-terminated silicone oil with the viscosity of 200 cst by a double-screw extruder according to the mass ratio of 90:3 to obtain silicone oil modified polypropylene resin;
Step three: and (3) extruding the silicone oil modified polypropylene resin prepared in the step two and the polypropylene resin raw material by a sheath-core spinning method through a single screw extruder at 200 ℃, cooling, stretching, heat setting and rolling to obtain the sheath-core structure high-hydrophobicity polypropylene medical monofilament with the diameter of 0.2 mm. The specific process adopts a water cooling mode, the cooling temperature is 12 oC, the stretching method is secondary stretching, the primary stretching ratio is 4, the secondary stretching ratio is 1.2, and the heat setting temperature is 160 oC.
Monofilament strength: 4.5 cN/dtex; contact angle 107 °; coefficient of friction: 0.31.
Comparative example:
and extruding and molding the polypropylene resin by a single screw extruder at the temperature of 200 ℃/210 ℃/210 ℃, cooling, stretching, heat setting and rolling to obtain the polypropylene medical monofilament.
Monofilament strength: 5.5 cN/dtex; contact angle 98.6 °; coefficient of friction: 0.47.
Claims (1)
1. The preparation method of the medical polypropylene monofilament with high hydrophobicity is characterized by comprising the following steps:
Step one: adding polypropylene resin granules into an ultralow temperature pulverizer, cooling by liquid nitrogen, reducing the temperature to-150 ℃, and pulverizing and screening at low temperature to obtain polypropylene resin powder with the particle size lower than 10 meshes; using an electron accelerator as an irradiation source, and pre-irradiating polypropylene resin powder with beta rays under the air atmosphere, wherein the pre-irradiation dose is 50 kGy, so as to obtain pre-irradiated polypropylene resin;
Step two: extruding and granulating the pre-irradiation polypropylene resin prepared in the step one and the polyvinyl silicone oil with the viscosity of 100 cst and the vinyl mass percent of 10 percent by a double-screw extruder according to the mass ratio of 90:15 to obtain silicone oil modified polypropylene resin;
Step three: extruding the silicone oil modified polypropylene resin prepared in the second step and the polypropylene resin raw material by a sheath-core spinning method through a single screw extruder at 210 ℃, cooling, stretching, heat setting and rolling to obtain the sheath-core structure high-hydrophobicity polypropylene medical monofilament with the diameter of 0.1 mm; the specific process adopts a water cooling mode, the cooling temperature is 12 ℃, the stretching method is secondary stretching, the primary stretching ratio is 4, the secondary stretching ratio is 1.2, and the heat setting temperature is 160 ℃;
The obtained monofilament: monofilament strength: 4.0 cN/dtex; contact angle 117 °; coefficient of friction: 0.11.
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| US6093200A (en) * | 1994-02-10 | 2000-07-25 | United States Surgical | Composite bioabsorbable materials and surgical articles made therefrom |
| CN102399386A (en) * | 2010-09-15 | 2012-04-04 | 中国石油天然气股份有限公司 | Preparation method of silicon-containing polyethylene high-lubrication composite material |
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| WO2009072299A1 (en) * | 2007-12-07 | 2009-06-11 | Panasonic Corporation | Stain-resistant polypropylene resin composition, and home electric appliance housing and toilet seat each comprising the composition |
| CN102719926B (en) * | 2012-06-21 | 2014-04-02 | 浙江理工大学 | Method for preparing fine denier dyeable polypropylene fiber by sheath-core compounding |
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| CN105801757A (en) * | 2016-03-24 | 2016-07-27 | 中国石油化工股份有限公司 | Long-chain-branch high-melt-strength polypropylene resin and preparation method thereof |
| EP4019121A4 (en) * | 2019-08-23 | 2023-09-06 | China Petroleum & Chemical Corporation | Super-wet surface and preparation method therefor and application thereof |
| CN113444449A (en) * | 2021-07-15 | 2021-09-28 | 惠州市永卓科技有限公司 | Ultraviolet-cured solvent-free release silicone oil and preparation method thereof |
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| CN102399386A (en) * | 2010-09-15 | 2012-04-04 | 中国石油天然气股份有限公司 | Preparation method of silicon-containing polyethylene high-lubrication composite material |
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