CN114770992A - Preparation method of polytetrafluoroethylene stretching belt, stretching belt and preparation device - Google Patents
Preparation method of polytetrafluoroethylene stretching belt, stretching belt and preparation device Download PDFInfo
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- CN114770992A CN114770992A CN202210426465.8A CN202210426465A CN114770992A CN 114770992 A CN114770992 A CN 114770992A CN 202210426465 A CN202210426465 A CN 202210426465A CN 114770992 A CN114770992 A CN 114770992A
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- polytetrafluoroethylene
- tape
- intermediate base
- stretching
- base band
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- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 138
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 138
- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 135
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 54
- 238000005245 sintering Methods 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 26
- 238000003490 calendering Methods 0.000 claims abstract description 21
- 239000010687 lubricating oil Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 25
- 238000005096 rolling process Methods 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 4
- 239000004809 Teflon Substances 0.000 description 3
- 229920006362 Teflon® Polymers 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D29/00—Producing belts or bands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
Abstract
The invention provides a preparation method of a polytetrafluoroethylene stretching belt, which comprises the following steps: mixing polytetrafluoroethylene resin and lubricating oil to obtain a mixed material; carrying out green compact processing on the mixed material to obtain a green body; extruding and molding the blank to obtain a polytetrafluoroethylene tape; heating and calendering the polytetrafluoroethylene base band to obtain a first intermediate base band; heating and stretching the first intermediate baseband to obtain a second intermediate baseband; heating and calendering the second intermediate base band to obtain a third intermediate base band; and sintering and stretching the third intermediate base band to obtain the polytetrafluoroethylene stretched band. The polytetrafluoroethylene stretched tape prepared by the invention has the characteristics of superfine high strength and high density. The invention also provides a polytetrafluoroethylene stretching belt and a preparation device of the polytetrafluoroethylene stretching belt.
Description
Technical Field
The invention relates to the technical field of polytetrafluoroethylene materials, in particular to a preparation method of a superfine high-strength high-density polytetrafluoroethylene stretched belt, the superfine high-strength high-density polytetrafluoroethylene stretched belt and a preparation device of the superfine high-strength high-density polytetrafluoroethylene stretched belt.
Background
At present, Polytetrafluoroethylene (PTFE) stretched belts mainly have two processing modes, namely a semi-sintered body stretching process and a sintered body stretching process. The semi-sintering body stretching process comprises the steps of mixing, compacting, extruding, rolling, deoiling, semi-sintering stretching and rolling, and the sintering body stretching process comprises the steps of mixing, compacting, extruding, rolling, deoiling, sintering stretching and rolling. However, the density of the stretched PTFE tape obtained by the semi-sintered body stretching process is low, the thickness of the stretched PTFE tape obtained by the sintered body stretching process is thick, and the tensile strength is low, which makes it difficult to meet the actual demand.
Disclosure of Invention
Accordingly, there is a need for a method for producing an ultra-fine high-strength high-density polytetrafluoroethylene stretched tape.
In addition, the superfine high-strength high-density polytetrafluoroethylene stretched belt prepared by the preparation method is also needed to be provided.
In addition, a preparation device of the superfine high-strength high-density polytetrafluoroethylene stretched belt is also needed to be provided.
The invention provides a preparation method of a polytetrafluoroethylene stretching belt, which comprises the following steps:
mixing polytetrafluoroethylene resin and lubricating oil to obtain a mixed material;
carrying out green compact processing on the mixed material to obtain a green body;
extruding and molding the blank to obtain a polytetrafluoroethylene tape;
heating and calendaring the polytetrafluoroethylene base band to obtain a first intermediate base band;
heating and stretching the first intermediate baseband to obtain a second intermediate baseband;
heating and calendering the second intermediate base band to obtain a third intermediate base band; and
and sintering and stretching the third intermediate base band to obtain the polytetrafluoroethylene stretched band.
Further, the temperature for heating and stretching the first intermediate base band is 300-340 ℃, and/or the stretching ratio for heating and stretching the first intermediate base band is 10-15 times.
Further, the temperature for heating and rolling the second intermediate base band is 50 ℃ to 100 ℃.
Further, the temperature for sintering and stretching the third intermediate base band is 360-430 ℃, and/or the stretching ratio for sintering and stretching the third intermediate base band is 3-12.
Further, after the sintering stretching treatment is performed on the third intermediate base tape, the method for preparing the polytetrafluoroethylene stretched tape further includes:
and heating and stretching the third intermediate base band to obtain the polytetrafluoroethylene stretched band.
Further, the temperature for heating and stretching the third intermediate base band is 280 ℃ to 360 ℃, and/or the stretching ratio for heating and stretching the third intermediate base band is 1.5 to 3.
Further, the thickness of the polytetrafluoroethylene stretching belt is 1-15 mu m, the width of the polytetrafluoroethylene stretching belt is 8-50 mm, and the density of the polytetrafluoroethylene stretching belt is more than or equal to 1.8g/cm3The tensile strength of the polytetrafluoroethylene tensile tape is greater than or equal to 400 MPa.
The invention also provides a polytetrafluoroethylene stretched tape prepared by the preparation method of the polytetrafluoroethylene stretched tape.
Further, the thickness of the polytetrafluoroethylene stretching belt is 1-15 mu m, the width of the polytetrafluoroethylene stretching belt is 8-50 mm, and the density of the polytetrafluoroethylene stretching belt is more than or equal to 1.8g/cm3The tensile strength of the polytetrafluoroethylene tensile tape is greater than or equal to 400 MPa.
Another aspect of the present invention provides a device for preparing a polytetrafluoroethylene stretch tape, comprising:
a mixer for mixing the polytetrafluoroethylene resin and the lubricating oil to obtain a mixed material;
the forming machine is used for carrying out green compact processing on the mixed material to obtain a green body;
the extruder is used for extruding and molding the blank body to obtain a polytetrafluoroethylene tape;
the first calender is used for heating and calendering the polytetrafluoroethylene base band to obtain a first intermediate base band;
the first stretcher is used for heating and stretching the first intermediate base band to obtain a second intermediate base band;
the second calender is used for carrying out heating calendering treatment on the second intermediate base band to obtain a third intermediate base band; and
and the second stretcher is used for sintering and stretching the third intermediate base band to obtain the polytetrafluoroethylene stretched band.
According to the invention, after the polytetrafluoroethylene tape is subjected to the heating rolling treatment step and before the sintering stretching treatment step, the steps of heating stretching and heating rolling treatment are added, so that the stretching multiplying power, the tensile strength and the density of the polytetrafluoroethylene tape are improved, and the superfine high-strength high-density polytetrafluoroethylene tape is obtained.
Drawings
FIG. 1 is a flow chart of the preparation of a polytetrafluoroethylene stretched tape provided by the invention.
FIG. 2 is a block diagram of an apparatus for producing a polytetrafluoroethylene tape according to the invention.
Icon: 100-a preparation device; 10-a mixer; 20-a forming machine; 30-an extruder; 40-a first calender; 50-a first stretcher; 60-a second calender; 70-second stretcher.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the present invention provides a method for preparing an ultra-fine high-strength high-density polytetrafluoroethylene stretch tape, comprising the steps of:
and step S11, mixing the polytetrafluoroethylene resin and the lubricating oil to obtain a mixed material.
Specifically, the polytetrafluoroethylene dispersing material and the lubricating oil are uniformly mixed and cured to obtain the mixed material. Wherein, the weight ratio between the polytetrafluoroethylene dispersing material and the lubricating oil mixture can be adjusted according to the requirement.
And step S12, carrying out compaction treatment on the mixed material to obtain a blank body.
Specifically, the cured mixture is pressed into a compact to obtain the round rod-shaped blank. The shape of the blank is not limited to a round bar shape, but may be other shapes according to actual needs.
And step S13, performing extrusion molding on the blank to obtain the polytetrafluoroethylene tape.
Specifically, the blank is paste-extruded into a flat film by an extruder, and the polytetrafluoroethylene tape is obtained. It is understood that the teflon-based tape in the present invention is a flat film. Wherein, the size of the film, such as the thickness, can be adjusted within a certain range according to actual needs.
And step S14, heating and rolling the polytetrafluoroethylene base band to obtain a first intermediate base band.
Specifically, the polytetrafluoroethylene tape may be heated to 60 ℃, and subjected to a calendering process at a temperature of 60 ℃ to obtain the first intermediate tape.
In other embodiments, the temperature of the heating and rolling process is not limited to 60 ℃, and may be other temperatures, such as 59 ℃ or 61 ℃. It will be appreciated that the temperature of the heat calendering process can be selected as desired.
And step S15, performing heating and stretching processing on the first intermediate baseband to obtain a second intermediate baseband.
Before the first intermediate base band is subjected to heating and stretching treatment, the first intermediate base band can be subjected to deoiling treatment to remove lubricating oil in the first intermediate base band, so that subsequent stretching is facilitated.
In one embodiment, the temperature for performing the heat stretching treatment on the first intermediate base tape may be 300 ℃ to 340 ℃. Specifically, the temperature at which the first intermediate base tape is subjected to the heat stretching treatment may be 320 ℃.
In an embodiment, a stretching ratio of the heating stretching treatment on the first intermediate base band may be 10 to 15 times. Specifically, the stretch ratio of the heat stretching treatment of the first intermediate base tape may be 12 times.
And step S16, performing heating and rolling processing on the second intermediate baseband to obtain a third intermediate baseband.
In one embodiment, the temperature for performing the heating and rolling treatment on the second intermediate base band may be 50 ℃ to 100 ℃. Specifically, the temperature at which the second intermediate base tape is subjected to the heat calendering treatment may be 75 ℃.
In the present invention, the density of the second intermediate base may be increased by subjecting the second intermediate base tape to a heating and rolling treatment. Compared with the traditional method of improving the density of the matrix through sintering, the method has higher efficiency through heating and rolling to improve the density of the matrix. Meanwhile, the second intermediate base band is heated and rolled, so that the stretching ratio of the second intermediate base body can be improved, and a thinner product can be obtained.
In addition, in the invention, because the temperature for heating and rolling the second intermediate base band is lower, compared with the traditional high-temperature sintering mode, the invention is beneficial to reducing energy consumption, thereby being beneficial to energy conservation and emission reduction.
And step S17, sintering and stretching the third intermediate base band to obtain the polytetrafluoroethylene stretched band.
In an embodiment, the temperature for sintering and stretching the third intermediate base band may be 360-430 ℃. Specifically, the temperature at which the sintering stretching process is performed on the third intermediate base tape may be 395 ℃.
In an embodiment, a stretching ratio of the sintering stretching process performed on the third intermediate base band may be 3 to 12 times. Specifically, the stretching ratio of the sintering stretching process performed on the third intermediate base tape may be 3 times.
In other embodiments, after the sintering stretching process is performed on the third intermediate base tape, a heating stretching process may be further performed on the third intermediate base tape to increase the tensile strength of the third intermediate base tape, so as to obtain the polytetrafluoroethylene stretched tape. It is understood that the tensile strength of the polytetrafluoroethylene stretched tape can be further improved by adding a step of heat stretching treatment after the sintering stretching treatment.
In one embodiment, the temperature for performing the heat stretching treatment on the third intermediate base tape may be 280 ℃ to 360 ℃. Specifically, the temperature at which the third intermediate base tape is subjected to the heat-stretching treatment may be 310 ℃.
In an embodiment, a stretching ratio of the heating stretching treatment performed on the third intermediate base tape may be 1.5 to 3 times. Specifically, the stretching ratio of the heat stretching treatment of the third intermediate base tape may be 2 times.
In an embodiment, after the polytetrafluoroethylene stretched tape is obtained, the obtained polytetrafluoroethylene stretched tape can be wound to facilitate storage of the polytetrafluoroethylene stretched tape.
In one embodiment, the thickness of the polytetrafluoroethylene stretched tape can be 1-15 μm, the width of the polytetrafluoroethylene stretching belt can be 8-50 mm. In one embodiment, the polytetrafluoroethylene tape may have a density greater than or equal to 1.8g/cm3。
In an embodiment, the tensile strength of the polytetrafluoroethylene tensile tape may be greater than or equal to 400 MPa. Preferably, the tensile strength of the polytetrafluoroethylene tensile tape may be greater than or equal to 1000 MPa.
The invention also provides the superfine high-strength high-density polytetrafluoroethylene stretched belt prepared by the preparation method. In one embodiment, the thickness of the polytetrafluoroethylene stretched tape may be 1 to 15 μm, and the width of the polytetrafluoroethylene stretched tape may be 8 to 50 mm. In one embodiment, the polytetrafluoroethylene tensile tape may have a density greater than or equal to 1.8g/cm3。
In an embodiment, the tensile strength of the polytetrafluoroethylene tensile tape may be greater than or equal to 400 MPa. Preferably, the tensile strength of the polytetrafluoroethylene tensile tape may be greater than or equal to 1000 MPa.
Referring to fig. 2, the present invention further provides a device 100 for preparing the ultra-fine high-strength high-density polytetrafluoroethylene stretched tape, which is used for preparing the ultra-fine high-strength high-density polytetrafluoroethylene stretched tape. In an embodiment, the preparation apparatus 100 includes a mixer 10, a molding machine 20, an extruder 30, a first calender 40, a first stretcher 50, a second calender 60, and a second stretcher 70.
In one embodiment, the mixer 10 is used to mix polytetrafluoroethylene resin and lubricating oil to obtain a mixed material.
In an embodiment, the forming machine 20 is used for compacting the mixture to obtain a green body.
In an embodiment, the extruder 30 is used for extruding the blank to obtain the teflon-based tape.
In an embodiment, the first calender 40 is configured to perform a heating calendering process on the teflon-based tape to obtain a first intermediate base tape.
In an embodiment, the first stretching machine 50 is configured to perform a heating stretching process on the first intermediate base tape to obtain a second intermediate base tape.
In an embodiment, the second calender 60 is configured to perform a heating calendering process on the second intermediate base band to obtain a third intermediate base band.
In an embodiment, the second stretcher 70 is used for sintering and stretching the third intermediate base tape to obtain a polytetrafluoroethylene stretched tape.
In other embodiments, the manufacturing apparatus 100 may include a third stretcher (not shown). The third stretcher is used for heating and stretching the sintered and stretched third intermediate matrix to obtain the polytetrafluoroethylene stretched tape.
The present invention is further illustrated by the following specific examples.
Example 1
The first step is to uniformly mix 100 parts of polytetrafluoroethylene dispersing material and 20-25 parts of lubricating oil by weight, and to perform curing to obtain a mixed material.
And secondly, compacting the cured mixed material to form a round rod-shaped blank.
And thirdly, paste extrusion is carried out on the round rod-shaped blank body to form the polytetrafluoroethylene-based belt. The polytetrafluoroethylene tape is a flat film, the thickness of the polytetrafluoroethylene tape is 1.0mm, and the width of the polytetrafluoroethylene tape is 120-150 mm.
And fourthly, heating the polytetrafluoroethylene base band to 60 ℃ for calendering treatment to obtain a first intermediate base band. Wherein the thickness of the first intermediate base band is 80-150 μm, and the width of the first intermediate base band is 120-150 mm.
And fifthly, performing deoiling treatment on the first intermediate baseband.
And sixthly, heating and stretching the deoiled first intermediate base band in a group of rollers or a plurality of groups of rollers heated to 300-340 ℃ to obtain a second intermediate base band. Wherein the stretching ratio is 10-15 times, the thickness of the second intermediate base band is 15-60 μm, and the width of the second intermediate base band is 50-90 mmThe density of the second intermediate base band is less than or equal to 0.7g/cm3。
And seventhly, performing heating and calendaring treatment on the second intermediate base band in a group of rollers heated to 50-100 ℃ to obtain a third intermediate base band. Wherein the thickness of the third intermediate base band is 10-30 μm, the width of the third intermediate base band is 40-80 mm, and the density of the third intermediate base band is greater than or equal to 1.9g/cm3。
And eighthly, sintering and stretching the third intermediate base band in an oven heated to 360-430 ℃ and an external stretching roller to obtain the polytetrafluoroethylene stretching band. Wherein the stretching magnification is 3-8 times.
And step nine, rolling the polytetrafluoroethylene stretching belt.
Example 2
The first step is to uniformly mix 100 parts of polytetrafluoroethylene dispersing material and 20-25 parts of lubricating oil by weight, and to perform curing to obtain a mixed material.
And secondly, compacting the cured mixed material to form a round rod-shaped blank.
And thirdly, performing paste extrusion on the round rod-shaped blank to form the polytetrafluoroethylene-based belt. The polytetrafluoroethylene tape is a flat film, the thickness of the polytetrafluoroethylene tape is 1.0mm, and the width of the polytetrafluoroethylene tape is 120-150 mm.
And fourthly, heating the polytetrafluoroethylene base band to 60 ℃ for calendering treatment to obtain a first intermediate base band. Wherein the thickness of the first intermediate base band is 70-150 μm, and the width of the first intermediate base band is 120-150 mm.
And fifthly, performing deoiling treatment on the first intermediate baseband.
And sixthly, heating and stretching the deoiled first intermediate base band in a group of rollers or a plurality of groups of rollers heated to 300-340 ℃ to obtain a second intermediate base band. Wherein the stretching multiplying power is 10-15 times, the thickness of the second intermediate base band is 12-60 mu m, the width of the second intermediate base band is 50-90 mm, and the density of the second intermediate base band is less than or equal to 0.7g/cm3。
And seventhly, performing heating and calendaring treatment on the second intermediate base band in a group of rollers heated to 50-100 ℃ to obtain a third intermediate base band. Wherein the thickness of the third intermediate base band is 8-30 μm, the width of the third intermediate base band is 40-80 mm, and the density of the third intermediate base band is greater than or equal to 1.9g/cm3。
And eighthly, sintering and stretching the third intermediate base band in an oven heated to 360-430 ℃ and an external stretching roller to obtain the polytetrafluoroethylene stretching band. Wherein the stretching magnification is 3-12 times.
And step nine, rolling the polytetrafluoroethylene stretching belt.
Example 2 is now summarized as follows:
the preparation method of example 2 is substantially the same as that of example 1 except that:
in the fourth step, the thickness of the first intermediate base band is 70-150 mu m; in the sixth step, the thickness of the second intermediate base band is 12-60 mu m; in the seventh step, the thickness of the third intermediate base band is 8-30 μm; in the eighth step, the stretching magnification is 3 to 12 times.
Example 3
Firstly, 100 parts by weight of polytetrafluoroethylene dispersing material and 20-25 parts by weight of lubricating oil are uniformly mixed and cured to obtain a mixed material.
And secondly, compacting the cured mixed material to form a round rod-shaped blank.
And thirdly, paste extrusion is carried out on the round rod-shaped blank body to form the polytetrafluoroethylene-based belt. The polytetrafluoroethylene tape is a flat film, the thickness of the polytetrafluoroethylene tape is 1.0mm, and the width of the polytetrafluoroethylene tape is 120-150 mm.
And fourthly, heating the polytetrafluoroethylene base band to 60 ℃ for calendering treatment to obtain a first intermediate base band. Wherein the thickness of the first intermediate base band is 70-150 μm, and the width of the first intermediate base band is 120-150 mm.
And fifthly, performing deoiling treatment on the first intermediate baseband.
And sixthly, heating and stretching the deoiled first intermediate base band in a group of rollers or a plurality of groups of rollers heated to 300-340 ℃ to obtain a second intermediate base band. Wherein the stretching multiplying power is 10-15 times, the thickness of the second intermediate base band is 12-60 mu m, the width of the second intermediate base band is 50-90 mm, and the density of the second intermediate base band is less than or equal to 0.7g/cm3。
And seventhly, performing heating calendering treatment on the second intermediate base band in a group of rollers heated to 50-100 ℃ to obtain a third intermediate base band. Wherein the thickness of the third intermediate base band is 8-30 μm, the width of the third intermediate base band is 40-80 mm, and the density of the third intermediate base band is greater than or equal to 1.9g/cm3。
And eighthly, sintering and stretching the third intermediate base band in an oven heated to 360-430 ℃ and an external stretching roller to obtain the polytetrafluoroethylene stretching band. Wherein the stretching magnification is 3-12 times.
And step nine, heating and stretching the third intermediate base band subjected to sintering and stretching treatment in a plurality of groups of rollers heated to 280-360 ℃ to obtain the polytetrafluoroethylene stretched band. Wherein the stretching magnification is 1.5 to 3 times.
And step ten, rolling the polytetrafluoroethylene stretching belt.
Example 3 is now summarized as follows:
the steps of the first step to the eighth step in embodiment 3 are the same as those of the first step to the eighth step in embodiment 2, respectively.
The polytetrafluoroethylene stretched tapes obtained in examples 1 to 3 were subjected to the tests of thickness, width, density, and tensile strength, respectively, and the test results are shown in table 1 below.
TABLE 1
As can be seen from the above Table 1, the polytetrafluoroethylene stretched tape prepared by the method has a thickness of 1-15 μm and a width of 8-50 mm. Wherein the density of the polytetrafluoroethylene stretched tapes prepared in examples 1-3 is greater than or equal to 1.8g/cm3. This indicates that the polytetrafluoroethylene stretched tape prepared by the method has higher density.
In addition, as is clear from Table 1 above, the tensile strengths of the polytetrafluoroethylene stretched tapes produced in examples 1 to 3 were all 400MPa or more. Among them, the tensile strength of the polytetrafluoroethylene stretched tapes prepared in examples 2 and 3 was even more than 1000 MPa. This shows that the polytetrafluoroethylene stretched tape prepared by the method has higher tensile strength.
In addition, the stretching ratio in the invention is 80-150 times, and the stretching ratio in the traditional process is generally 10-30 times, so that the invention can obtain a polytetrafluoroethylene stretching belt product with thinner thickness and higher stretching strength.
According to the invention, after the polytetrafluoroethylene tape is subjected to the heating and rolling treatment step and before the sintering and stretching treatment step, the heating and stretching and heating and rolling treatment steps are added, so that the stretching multiplying power, the tensile strength and the density of the polytetrafluoroethylene tape are improved, and the superfine high-strength high-density polytetrafluoroethylene tape is obtained.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A preparation method of a polytetrafluoroethylene stretched tape is characterized by comprising the following steps:
mixing polytetrafluoroethylene resin and lubricating oil to obtain a mixed material;
carrying out green compact processing on the mixed material to obtain a green body;
extruding and molding the blank to obtain a polytetrafluoroethylene tape;
heating and calendering the polytetrafluoroethylene base band to obtain a first intermediate base band;
heating and stretching the first intermediate baseband to obtain a second intermediate baseband;
heating and calendering the second intermediate base band to obtain a third intermediate base band; and
and sintering and stretching the third intermediate base band to obtain the polytetrafluoroethylene stretched band.
2. The method for producing a stretched polytetrafluoroethylene tape according to claim 1, wherein the temperature at which the first intermediate base tape is subjected to the heat-stretching treatment is 300 ℃ to 340 ℃, and/or the stretching ratio at which the first intermediate base tape is subjected to the heat-stretching treatment is 10 to 15 times.
3. The process for producing a stretched polytetrafluoroethylene tape according to claim 2, wherein the temperature at which the second intermediate base tape is subjected to the heat-rolling treatment is 50 ℃ to 100 ℃.
4. The method for producing a stretched polytetrafluoroethylene tape according to claim 3, wherein the temperature at which the third intermediate base tape is subjected to the sintering stretching treatment is 360 to 430 ℃ and/or the stretching ratio at which the third intermediate base tape is subjected to the sintering stretching treatment is 3 to 12 times.
5. The method for producing a stretched polytetrafluoroethylene tape according to any one of claims 1 to 4, further comprising, after the sintering stretching treatment of the third intermediate base tape:
and heating and stretching the third intermediate base band to obtain the polytetrafluoroethylene stretched band.
6. The method for producing a stretched polytetrafluoroethylene tape according to claim 5, wherein the temperature at which the third intermediate tape is subjected to the heat-stretching treatment is 280 to 360 ℃, and/or the stretch ratio at which the third intermediate tape is subjected to the heat-stretching treatment is 1.5 to 3 times.
7. The method for producing a polytetrafluoroethylene stretched tape according to any one of claims 1 to 4 and 6, wherein the polytetrafluoroethylene stretched tape has a thickness of 1 to 15 μm, a width of 8 to 50mm, and a density of 1.8g/cm or more3The tensile strength of the polytetrafluoroethylene tensile tape is greater than or equal to 400 MPa.
8. A stretched polytetrafluoroethylene tape produced by the method for producing a stretched polytetrafluoroethylene tape according to any one of claims 1 to 7.
9. The stretched polytetrafluoroethylene tape according to claim 8, wherein the stretched polytetrafluoroethylene tape has a thickness of 1 to 15 μm, a width of 8 to 50mm, and a density of 1.8g/cm or more3And the tensile strength of the polytetrafluoroethylene tensile belt is greater than or equal to 400 MPa.
10. A preparation facilities of tensile area of polytetrafluoroethylene, characterized by including:
a mixer for mixing the polytetrafluoroethylene resin and the lubricating oil to obtain a mixed material;
the forming machine is used for carrying out green compact processing on the mixed material to obtain a green body;
the extruder is used for extruding and molding the blank body to obtain a polytetrafluoroethylene tape;
the first calender is used for heating and calendering the polytetrafluoroethylene base band to obtain a first intermediate base band;
the first stretcher is used for heating and stretching the first intermediate base band to obtain a second intermediate base band;
the second calender is used for carrying out heating calendering treatment on the second intermediate base band so as to obtain a third intermediate base band; and
and the second stretcher is used for sintering and stretching the third intermediate base band to obtain the polytetrafluoroethylene stretched band.
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Citations (7)
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