CN111390430A - Preparation method and application of ultra-high molecular weight polyethylene welding wire - Google Patents
Preparation method and application of ultra-high molecular weight polyethylene welding wire Download PDFInfo
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- CN111390430A CN111390430A CN202010202171.8A CN202010202171A CN111390430A CN 111390430 A CN111390430 A CN 111390430A CN 202010202171 A CN202010202171 A CN 202010202171A CN 111390430 A CN111390430 A CN 111390430A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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Abstract
The invention discloses a preparation method and application of an ultra-high molecular weight polyethylene welding wire, wherein the preparation method comprises the following steps: (1) modification of ultra-high molecular weight polyethylene: blending and melting the ultra-high molecular weight polyethylene and a modifier to prepare a granular modified ultra-high molecular weight polyethylene raw material; (2) preparing an ultrahigh molecular weight polyethylene welding wire: and melting and extruding the modified ultrahigh molecular weight polyethylene granules by an extruder to form a melt, extruding the melt by a monofilament forming die to form monofilaments, drawing and stretching the monofilaments by a three-roller tractor, and winding by a winding machine to obtain the ultrahigh molecular weight polyethylene welding wire. The welding wire prepared by the invention can be used for welding the ultra-high molecular weight polyethylene composite membrane, can realize smooth connection of seams of the ultra-high molecular weight polyethylene composite membrane, has the strength reaching the strength of the body composite membrane, and has the advantages of simple process, low cost, convenient operation and good welding effect.
Description
Technical Field
The invention relates to the technical field of ultra-high molecular weight polyethylene materials, in particular to a preparation method and application of an ultra-high molecular weight polyethylene welding wire.
Background
The ultra-high molecular weight polyethylene (UHMWPE) film has excellent wear resistance and impact resistance, and the impact resistance in a low-temperature state is also excellent; the friction coefficient is small, the polarity is absent, the surface energy is low, the dirt resistance and the anti-icing performance are good; and the excellent chemical stability makes it quite widely used in various fields.
However, in some fine applications, the requirement of the substrate shape inevitably produces a large number of film-to-film seams, which are often the starting points of dirt adhesion and film breakage, and the application of the ultra-high molecular weight and ethylene film is severely restricted. Due to poor melt fluidity of UHMWPE body materials, materials at two ends of a welding line are difficult to achieve interface-free smooth connection in a molten state in the process of melt welding, the welding line can be correspondingly sunken, although the welding wire can be smoothly sunken, due to the limitation of melt fluidity, the contact part of the welding wire and the materials at the two ends is difficult to achieve melt mixing, the strength of the welding line is insufficient, and the welding line becomes a failure starting point in the subsequent application process.
At present, no welding process can well treat the seam problem, and sealing is mainly performed by using a sealant.
Disclosure of Invention
In order to solve the technical problems, the invention provides a preparation method and application of an ultra-high molecular weight polyethylene welding wire, so as to achieve the purposes of realizing smooth connection of seams of ultra-high molecular weight polyethylene composite films and achieving the strength of a body composite film.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a preparation method of an ultra-high molecular weight polyethylene welding wire comprises the following steps:
(1) modification of ultra-high molecular weight polyethylene: blending and melting the ultra-high molecular weight polyethylene and a modifier to prepare a granular modified ultra-high molecular weight polyethylene raw material; the modifier comprises the following modifiers in percentage by mass: 1-5% of a disentanglement agent graphene, 1-5% of a dispersant polyethylene wax, 1-5% of PPA (polyphthalamide), 1-5% of medium molecular weight polyethylene with the molecular weight of 20-30 ten thousand, and the balance of ultra-high molecular weight polyethylene;
(2) preparing an ultrahigh molecular weight polyethylene welding wire: and melting and extruding the modified ultrahigh molecular weight polyethylene granules by an extruder to form a melt, extruding the melt by a monofilament forming die to form monofilaments, drawing and stretching the monofilaments by a three-roller tractor, and winding by a winding machine to obtain the ultrahigh molecular weight polyethylene welding wire.
In the above scheme, the viscosity average molecular weight of the ultra-high molecular weight polyethylene is more than 150 ten thousand,
in the above scheme, the viscosity-average molecular weight of the ultra-high molecular weight polyethylene is 250 to 500 ten thousand.
In the scheme, the melt mass flow rate of the modified ultrahigh molecular weight polyethylene raw material is 0.5-3.0 g/10 min.
In the scheme, the diameter of the ultra-high molecular weight polyethylene welding wire is 0.5-5mm, and the mass flow rate of the solution is 0.5-3.0 g/10 min.
An application of a welding wire prepared by the preparation method of the ultra-high molecular weight polyethylene welding wire in welding an ultra-high molecular weight polyethylene composite film.
The application of the ultra-high molecular weight polyethylene welding wire comprises the following steps:
firstly, measuring the width of a welding seam, and selecting a welding wire with a proper diameter; then, a welding wire extends into the nozzle through the feeding hole and extends out of the pressing plate, the welding wire is pressed into a seam at one end of the ultra-high molecular weight polyethylene composite film by the pressing plate, the position of the flattening roller is adjusted, the air blowing gun is preheated to a proper welding temperature, after the temperature is reached, a proper pressure is supplied to the welding gun, the welding gun is moved to weld by taking the pressing plate as a fulcrum, the welding gun is moved until the other end of the seam, and redundant welding wire is drawn out in the period, so that the seam is smoothly connected.
In a further technical scheme, the hot-pressing welding seam is repeated for 2 times at the same temperature, pressure and welding speed, so that the seam is smoothly connected.
In a further technical scheme, the welding temperature is 140-220 ℃, and the welding pressure is 0.01-0.10 Mpa.
In a further technical scheme, the pressing plate is made of metal, and a polytetrafluoroethylene coating is coated on the surface of the pressing plate; the flattening roller is made of polytetrafluoroethylene.
By the technical scheme, in the preparation process of the ultra-high molecular weight polyethylene welding wire, the welding wire prepared by adding a proper modifier has good melt fluidity; in the application process, the implementation of the welding process enables the ultra-high molecular weight polyethylene composite films at two ends of the welding line to rapidly reach a molten state at the application temperature, and simultaneously applies proper pressure to enable the composite films at two ends to be molten and mixed.
Thus, the smooth connection of the seams of the ultra-high molecular weight polyethylene composite membrane is realized through hot-press welding, and the strength can reach the strength of the body composite membrane. The welding problem of the ultra-high molecular weight polyethylene composite membrane in the application process is solved, and the application range of the ultra-high molecular weight polyethylene composite membrane is greatly widened.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a schematic diagram of a welding application process of an ultra-high molecular weight polyethylene welding wire according to an embodiment of the present invention.
In the figure, 1, welding wire; 2. a feed inlet; 3. a nozzle; 4. pressing a plate; 5. an ultra-high molecular weight polyethylene-ethylene propylene diene monomer composite film; 6. welding seams; 7. flattening rollers; 8. a hot air gun.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides a preparation method of an ultrahigh molecular weight polyethylene welding wire, which comprises the following steps:
(1) modification of ultra-high molecular weight polyethylene: blending and melting the ultra-high molecular weight polyethylene and a modifier to prepare a granular modified ultra-high molecular weight polyethylene raw material; wherein, the modifier comprises the following components by mass: 2g of disentangling agent graphene, 2g of dispersant polyethylene wax, 1g of PPA (polyphthalamide), 1g of medium molecular weight polyethylene with the molecular weight of 20-30 ten thousand and 50g of ultrahigh molecular weight polyethylene;
(2) preparing an ultrahigh molecular weight polyethylene welding wire: and melting and extruding the modified ultrahigh molecular weight polyethylene granules by an extruder to form a melt, extruding the melt by a monofilament forming die to form monofilaments, drawing and stretching the monofilaments by a three-roller tractor, and winding by a winding machine to obtain the ultrahigh molecular weight polyethylene welding wire.
Wherein the viscosity average molecular weight of the ultra-high molecular weight polyethylene is 300 ten thousand, and the viscosity average molecular weight of the medium molecular weight polyethylene is 25 ten thousand; the extruder is a single-screw or double-screw extruder, the base and the temperature are set to be 100-270 ℃, and the melt mass flow rate MFR of the monofilament is 2.8g/10 min.
Welding the ultra-high molecular weight polyethylene-ethylene propylene diene monomer composite film joint by using the prepared ultra-high molecular weight polyethylene welding wire: the width of the seam is 1.2mm, and the length of the seam is 20 cm.
The air blowing gun is preheated to 160 ℃, as shown in figure 1, 1.2mm UHMWPE welding wires 1 are inserted into a welding nozzle 3 from a feeding hole 2 and extend to a position of a pressure plate 4, the starting point of the welding wires 1 is pressed into a welding seam 6 from the pressure plate 4, the angle of the nozzle 3 is adjusted so that a flattening roller 7 can carry out smooth processing on the welding seam 6 along with the welding, a hot air gun 8 and the nozzle are connected, 0.05Mpa pressure is applied, the welding is completed at the speed of 1cm/s, and the hot pressing welding seam is repeated for 2 times at the same temperature, pressure and welding speed. Finally, the welding of the 5 joints of the ultra-high molecular weight polyethylene-ethylene propylene diene monomer composite membrane is successfully completed, and the strength of the joints reaches the strength of the body composite membrane.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A preparation method of an ultra-high molecular weight polyethylene welding wire is characterized by comprising the following steps:
(1) modification of ultra-high molecular weight polyethylene: blending and melting the ultra-high molecular weight polyethylene and a modifier to prepare a granular modified ultra-high molecular weight polyethylene raw material; the modifier comprises the following modifiers in percentage by mass: 1-5% of a disentanglement agent graphene, 1-5% of a dispersant polyethylene wax, 1-5% of PPA (polyphthalamide), 1-5% of medium molecular weight polyethylene with the molecular weight of 20-30 ten thousand, and the balance of ultra-high molecular weight polyethylene;
(2) preparing an ultrahigh molecular weight polyethylene welding wire: and melting and extruding the modified ultrahigh molecular weight polyethylene granules by an extruder to form a melt, extruding the melt by a monofilament forming die to form monofilaments, drawing and stretching the monofilaments by a three-roller tractor, and winding by a winding machine to obtain the ultrahigh molecular weight polyethylene welding wire.
2. The method for producing an ultra-high molecular weight polyethylene welding wire according to claim 1, wherein the viscosity average molecular weight of the ultra-high molecular weight polyethylene is 150 ten thousand or more.
3. The method for producing an ultra-high molecular weight polyethylene welding wire according to claim 1, wherein the viscosity-average molecular weight of the ultra-high molecular weight polyethylene is 250 to 500 ten thousand.
4. The method for preparing the ultra-high molecular weight polyethylene welding wire according to claim 1, wherein the melt mass flow rate of the modified ultra-high molecular weight polyethylene raw material is 0.5-3.0 g/10 min.
5. The method for preparing the ultra-high molecular weight polyethylene welding wire according to claim 1, wherein the diameter of the ultra-high molecular weight polyethylene welding wire is 0.5-5mm, and the melt mass flow rate is 0.5-3.0 g/10 min.
6. The use of the welding wire prepared by the method for preparing the ultra-high molecular weight polyethylene welding wire according to claim 1 in welding ultra-high molecular weight polyethylene composite films.
7. Use of an ultra high molecular weight polyethylene welding wire according to claim 6, characterized by the process of:
firstly, measuring the width of a welding seam, and selecting a welding wire with a proper diameter; then, a welding wire extends into the nozzle through the feeding hole and extends out of the pressing plate, the welding wire is pressed into a seam at one end of the ultra-high molecular weight polyethylene composite film by the pressing plate, the position of the flattening roller is adjusted, the air blowing gun is preheated to a proper welding temperature, after the temperature is reached, a proper pressure is supplied to the welding gun, the welding gun is moved to weld by taking the pressing plate as a fulcrum, the welding gun is moved until the other end of the seam, and redundant welding wire is drawn out in the period, so that the seam is smoothly connected.
8. The use of the ultra high molecular weight polyethylene welding wire according to claim 7, wherein the heat pressing weld is repeated 2 times at the same temperature, pressure and welding speed to make the joint smoothly join.
9. The use of the ultra-high molecular weight polyethylene welding wire according to claim 7, wherein the welding temperature is 140 to 220 ℃ and the welding pressure is 0.01 to 0.10 MPa.
10. The use of the ultra high molecular weight polyethylene welding wire according to claim 7, wherein the pressure plate is made of metal and coated with a polytetrafluoroethylene coating; the flattening roller is made of polytetrafluoroethylene.
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| CN202010202171.8A CN111390430B (en) | 2020-03-20 | 2020-03-20 | Preparation method and application of ultra-high molecular weight polyethylene welding wire |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4938820A (en) * | 1987-06-11 | 1990-07-03 | Raychem Corporation | Joining of sheets |
| US20030042292A1 (en) * | 2001-09-05 | 2003-03-06 | Hatten Timothy E. | Apparatus and method for friction stir welding using filler material |
| CN103057115A (en) * | 2013-02-06 | 2013-04-24 | 刘阜东 | Method and welding machine for welding pipe by using ultra-high molecular weight polyethylene membrane belt through hot melting |
| CN104128716A (en) * | 2014-08-01 | 2014-11-05 | 南京航空航天大学 | Sintered flux containing nano plastic particles |
| CN110815879A (en) * | 2019-10-15 | 2020-02-21 | 青岛正爱科技有限公司 | Preparation method and application of ultra-high molecular weight polyethylene composite membrane |
-
2020
- 2020-03-20 CN CN202010202171.8A patent/CN111390430B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4938820A (en) * | 1987-06-11 | 1990-07-03 | Raychem Corporation | Joining of sheets |
| US20030042292A1 (en) * | 2001-09-05 | 2003-03-06 | Hatten Timothy E. | Apparatus and method for friction stir welding using filler material |
| CN103057115A (en) * | 2013-02-06 | 2013-04-24 | 刘阜东 | Method and welding machine for welding pipe by using ultra-high molecular weight polyethylene membrane belt through hot melting |
| CN104128716A (en) * | 2014-08-01 | 2014-11-05 | 南京航空航天大学 | Sintered flux containing nano plastic particles |
| CN110815879A (en) * | 2019-10-15 | 2020-02-21 | 青岛正爱科技有限公司 | Preparation method and application of ultra-high molecular weight polyethylene composite membrane |
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| CN111390430B (en) | 2021-06-29 |
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