CN113026130A - Preparation method of polytetrafluoroethylene superfine short fiber - Google Patents

Preparation method of polytetrafluoroethylene superfine short fiber Download PDF

Info

Publication number
CN113026130A
CN113026130A CN202110258043.XA CN202110258043A CN113026130A CN 113026130 A CN113026130 A CN 113026130A CN 202110258043 A CN202110258043 A CN 202110258043A CN 113026130 A CN113026130 A CN 113026130A
Authority
CN
China
Prior art keywords
ptfe
temperature
rollers
base band
polytetrafluoroethylene superfine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110258043.XA
Other languages
Chinese (zh)
Other versions
CN113026130B (en
Inventor
庞同峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shandong Senrong New Materials Co ltd
Original Assignee
Shandong Senrong New Materials Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shandong Senrong New Materials Co ltd filed Critical Shandong Senrong New Materials Co ltd
Priority to CN202110258043.XA priority Critical patent/CN113026130B/en
Publication of CN113026130A publication Critical patent/CN113026130A/en
Application granted granted Critical
Publication of CN113026130B publication Critical patent/CN113026130B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • D01D5/42—Formation of filaments, threads, or the like by cutting films into narrow ribbons or filaments or by fibrillation of films or filaments
    • D01D5/423—Formation of filaments, threads, or the like by cutting films into narrow ribbons or filaments or by fibrillation of films or filaments by fibrillation of films or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/82—Heating or cooling
    • B29B7/823—Temperature control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/24—Calendering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
    • 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
    • D01D5/26—Formation of staple fibres

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Artificial Filaments (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention belongs to the technical field of preparation of polytetrafluoroethylene short fibers, and particularly relates to a preparation method of polytetrafluoroethylene superfine short fibers. Mixing PTFE dispersion resin particles, a boosting agent and a surfactant at low temperature, curing at high temperature, and then prepressing to obtain a blank; extruding and rolling the blank to obtain an oil-containing base band; degreasing the oil-containing base band, sintering and shaping the degreased oil-containing base band, longitudinally stretching the degreased oil-containing base band, breaking the net of the obtained PTFE film to enable the PTFE film to be in a grid state, then conveying the PTFE film to a carding device, carding the PTFE film into finer wire harnesses in the grid state through card clothing, bundling the obtained wire harnesses by a buncher, and finally curling, cutting and opening the bundled wire harnesses to obtain the PTFE short fiber. The preparation method of the polytetrafluoroethylene superfine short fiber has the advantages of simple preparation process, easy realization of industrial production, stable performance of the prepared PTFE short fiber, high yield, good mechanical property and temperature resistance and wide application range.

Description

Preparation method of polytetrafluoroethylene superfine short fiber
Technical Field
The invention belongs to the technical field of preparation of polytetrafluoroethylene short fibers, and particularly relates to a preparation method of polytetrafluoroethylene superfine short fibers.
Background
Polytetrafluoroethylene, commonly known as "plastic king", is a high molecular compound formed by polymerizing tetrafluoroethylene, has excellent chemical stability, corrosion resistance, sealing property, high lubrication non-adhesiveness, electrical insulation property and good anti-aging endurance capacity, and can be used as engineering plastic; the filling of the fiber can effectively improve the strength and rigidity of the plastic, and the reinforced plastic belongs to a rigid structural material.
There are two methods for producing PTFE staple fibers, the first being melt spinning, which is not possible to produce staple fibers by conventional melt spinning methods because of the extremely poor flowability of PTFE in the molten state. The viscose is used as carrier, the viscose molten emulsion and PTFE dispersed emulsion are mixed into one body, then the extruded spinning is made, then the viscose component is thermally decomposed by high temp. to retain PTFE component and become PTFE short fibre. The manufacturing method has large investment, high cost and complex process, and the produced short fiber has low strength and is brown, and the application of the short fiber is limited.
The second method for producing short PTFE fibers is membrane splitting, which is a method of producing white or other fibers of various colors by mechanically splitting a PTFE dispersion resin into oriented membranes having a strength and a fiber orientation in the longitudinal (longitudinal) direction, and then splitting the membranes in the width (transverse) direction to form linear fibers in the longitudinal direction. The second manufacturing method has the advantages of low investment and low cost, and the produced PTFE short fiber has high strength and can produce various colors according to the requirements, so the method has wide application.
The PTFE superfine short fiber is widely applied to the fields of waste incineration, power plant dust removal, cement dust removal, building materials and the like due to excellent stability and extremely low shrinkage rate, and the cut PTFE short fiber can be made into needle felt and the like. In the process of preparing the polytetrafluoroethylene superfine short fibers, the monofilament is thick and difficult to comb, so that the production quality of the PTFE superfine short fibers is unstable, and therefore, a novel preparation method of the polytetrafluoroethylene superfine short fibers is urgently needed.
Disclosure of Invention
The purpose of the invention is: provides a preparation method of polytetrafluoroethylene superfine short fibers. The polytetrafluoroethylene superfine short fiber prepared by the method has the advantages of high yield, low shrinkage, low density, high tensile strength and wide temperature resistance.
The preparation method of the polytetrafluoroethylene superfine short fiber comprises the following steps:
(1) mixing PTFE dispersion resin particles, a boosting agent and a surfactant at low temperature, curing at high temperature, pre-pressing, and pre-pressing into a cylindrical blank;
(2) putting the blank into a pushing machine to obtain an extruded strip, and then putting the extruded strip into a calender to obtain an oil-containing base band;
(3) degreasing the oil-containing baseband in a degreasing machine to obtain a degreased baseband;
(4) putting the degreased base band on an unreeling platform of a carding machine, sintering and shaping while longitudinally stretching, breaking the obtained PTFE film to enable the PTFE film to be in a uniform grid state, then conveying the PTFE film to a carding device, carding the PTFE film into fine wire harnesses in the grid state through card clothing, bundling the obtained wire harnesses by a buncher, and finally curling, cutting and opening to obtain the PTFE short fiber.
Wherein:
the low-temperature mixing temperature in the step (1) is 20-25 ℃, the mixing time is 15-30 min, and the mixing and stirring temperature is controlled at 20-25 ℃, so that the pre-forming of filaments by the PTFE dispersion resin is prevented.
The particle size of the PTFE dispersion resin particle material in the step (1) is 300-600 microns.
The boosting agent in the step (1) is one of kerosene or white oil.
The surfactant in the step (1) is one of polyoxyethylene dodecyl ether or 2- (3' -perfluorooctyl) propoxy-1, 2, 3-tricarballylic acid.
The mixing mass ratio of the PTFE dispersion resin particle material, the boosting agent and the surfactant in the step (1) is 1:0.18-0.2: 0.025-0.03.
The curing temperature in the step (1) is 40-50 ℃, and the curing time is 12-24 hours.
The prepressing pressure in the step (1) is 0.1-0.6MPa, and the time is 10-30 min.
The extrusion temperature of the extruder in the step (2) is 30-50 ℃.
The compression ratio of the pushing machine in the step (2) is 100-150; the speed of the extruded material strip is 0.8-1 m/min.
The temperature of the roller during the rolling in the step (2) is 30-60 ℃, the thickness of the rolled base band is 0.05-0.15mm, and the width is 15-35 cm.
The degreasing temperature in the step (3) is 130-200 ℃, and the drying aims to volatilize the boosting agent.
The sintering and shaping temperature in the step (4) is 330-350 ℃, and preferably 335 ℃.
And (3) longitudinally stretching the steel plate by multiple rollers at a total longitudinal stretching multiple of 4-5 times, wherein the number of the multiple rollers is 5, the stretching multiple of each roller is different, and the stretching multiple of each roller is 5%, 10%, 30% and 50% of the total stretching multiple in sequence.
The net breaking in the step (4) adopts 4 groups of rollers, each group of rollers comprises two compression rollers with the same rotating speed which are arranged up and down, and the rotating speed of each group of rollers is 20m/min, 100m/min, 22m/min and 24m/min respectively.
And (4) carding the card clothing in the step (4), wherein the diameter of the card wheel is 100-150mm, the needling density is 20-22 in 10mm, and the linear speed of the card wheel is adjusted according to actual production equipment.
The number of crimps in step (4) is 6-8 per 25 mm. The number of crimps of the wire harness between a certain length in a crimp-set state.
The polytetrafluoroethylene superfine short fiber is used for preparing the PTFE needled felt, the PTFE needled felt is suitable for filtering industrial high-temperature flue gas in the industries of coal-fired power generation, cement, waste incineration, steel, metallurgy, refractory materials, chemical engineering and the like, and the polytetrafluoroethylene superfine short fiber is an ideal high-temperature-resistant filtering material.
Compared with the prior art, the invention has the following beneficial effects:
(1) the preparation method of the polytetrafluoroethylene superfine short fiber has the advantages of simple preparation process, easy realization of industrial production, stable performance of the prepared PTFE short fiber, high yield, good mechanical property and temperature resistance and wide application range.
(2) The polytetrafluoroethylene superfine short fiber prepared by the preparation method has the length of 50-65mm, the fineness of 0.81-0.99D, the shrinkage rate of 2.7-3.3 percent, the tensile strength of 1.3N-1.7N/dtex, the temperature resistance of-190-260 ℃, and the specific resistance value of less than or equal to 108Omega cm, and has good acid resistance, alkali resistance and hydrolysis resistance.
(3) The polytetrafluoroethylene superfine short fiber prepared by the method has small resistance and good air permeability as a filtering material, the dust removal efficiency is higher than that of a common filtering material, and the filtering speed is doubled or more than that of the common filtering material; the surface is smooth and smooth, the filter material is not easy to be blocked by dust, the chemical stability is good, the filter material has the advantages of high temperature resistance, high humidity resistance, corrosion resistance, wear resistance, high filter precision, easy dust removal and the like, and the superfine fiber is used as a dust facing layer of the needled felt, so that the filter precision of the filter material is greatly improved.
(4) The polytetrafluoroethylene superfine short fiber prepared by the method is used for preparing the PTFE needled felt, the PTFE needled felt is suitable for filtering industrial high-temperature flue gas in the industries of coal-fired power generation, cement, waste incineration, steel, metallurgy, refractory materials, chemical engineering and the like, and the polytetrafluoroethylene superfine short fiber is an ideal high-temperature resistant filtering material; the polytetrafluoroethylene superfine short fibers are used as filter materials, can intercept a part of dioxin generated in the waste incineration process, and are advanced in China and even worldwide.
Detailed Description
The present invention is further described below with reference to examples.
Example 1
The preparation method of the polytetrafluoroethylene superfine short fiber described in this embodiment 1 comprises the following steps:
(1) mixing PTFE dispersion resin particles, a boosting agent and a surfactant at low temperature, curing at high temperature, pre-pressing, and pre-pressing into a cylindrical blank;
(2) putting the blank into a pushing machine to obtain an extruded strip, and then putting the extruded strip into a calender to obtain an oil-containing base band;
(3) degreasing the oil-containing baseband in a degreasing machine to obtain a degreased baseband;
(4) putting the degreased base band on an unreeling platform of a carding machine, sintering and shaping while longitudinally stretching, breaking the obtained PTFE film to enable the PTFE film to be in a uniform grid state, then conveying the PTFE film to a carding device, carding the PTFE film into fine wire harnesses in the grid state through card clothing, bundling the obtained wire harnesses by a buncher, and finally curling, cutting and opening to obtain the PTFE short fiber.
Wherein:
the low-temperature mixing temperature in the step (1) is 25 ℃, the mixing time is 20min, and the mixing and stirring temperature is controlled at 25 ℃, so that the pre-forming fibril of the PTFE dispersion resin is prevented.
The particle size of the PTFE dispersion resin particle material in the step (1) is 300-600 microns.
The boosting agent in the step (1) is kerosene.
The surfactant in the step (1) is polyoxyethylene dodecyl ether.
The mixing mass ratio of the PTFE dispersion resin particles, the boosting agent and the surfactant in the step (1) is 1:0.2: 0.03.
The curing temperature in the step (1) is 40 ℃, and the curing time is 24 hours.
The prepressing pressure in the step (1) is 0.1MPa, and the time is 10 min.
The extrusion temperature of the extruder in the step (2) is 50 ℃.
The compression ratio of the extruder in the step (2) is 150; the speed of extruding the material strip is 1 m/min.
And (3) during rolling, the temperature of the roller is 60 ℃, the thickness of the rolled base band is 0.11mm, and the width of the rolled base band is 35 cm.
The degreasing temperature in the step (3) is 200 ℃; the purpose of drying is to evaporate the propellant.
The sintering and shaping temperature in the step (4) is 340 ℃.
And (3) longitudinally stretching the steel plate by multiple rollers with the total longitudinal stretching multiple of 4 times in the step (4), wherein the number of the multiple rollers is 5, the stretching multiple of each roller is different, and the stretching multiple of each roller is 5%, 10%, 30% and 50% of the total longitudinal stretching multiple in sequence.
The net breaking in the step (4) adopts 4 groups of rollers, each group of rollers comprises two compression rollers with the same rotating speed which are arranged up and down, and the rotating speed of each group of rollers is 20m/min, 100m/min, 22m/min and 24m/min respectively.
And (4) carding the card clothing in the step (4), wherein the diameter of the card clothing is 100mm, the needling density is 20 in 10mm, and the linear speed of the card clothing is adjusted according to actual production equipment.
The number of crimps described in step (4) is 6/25 mm.
By adopting the preparation method described in the embodiment 1, the prepared polytetrafluoroethylene superfine short fiber has the length of 50mm, the fineness of 0.95D, the shrinkage rate of 3.3 percent, the tensile strength of 1.7N/dtex, the temperature resistance of-190-260 ℃ and the specific resistance value of 107Omega cm, and has good acid resistance, alkali resistance and hydrolysis resistance.
Example 2
The preparation method of the polytetrafluoroethylene superfine short fiber described in this embodiment 2 comprises the following steps:
(1) mixing PTFE dispersion resin particles, a boosting agent and a surfactant at low temperature, curing at high temperature, pre-pressing, and pre-pressing into a cylindrical blank;
(2) putting the blank into a pushing machine to obtain an extruded strip, and then putting the extruded strip into a calender to obtain an oil-containing base band;
(3) degreasing the oil-containing baseband in a degreasing machine to obtain a degreased baseband;
(4) putting the degreased base band on an unreeling platform of a carding machine, sintering and shaping while longitudinally stretching, breaking the obtained PTFE film to enable the PTFE film to be in a uniform grid state, then conveying the PTFE film to a carding device, carding the PTFE film into fine wire harnesses in the grid state through card clothing, bundling the obtained wire harnesses by a buncher, and finally curling, cutting and opening to obtain the PTFE short fiber.
Wherein:
the low-temperature mixing temperature in the step (1) is 20 ℃, the mixing time is 30min, and the mixing and stirring temperature is controlled at 20 ℃, so that the pre-forming fibril of the PTFE dispersion resin is prevented.
The particle size of the PTFE dispersion resin particle material in the step (1) is 300-600 microns.
The boosting agent in the step (1) is white oil.
The surfactant in the step (1) is polyoxyethylene dodecyl ether.
The mixing mass ratio of the PTFE dispersion resin particles, the boosting agent and the surfactant in the step (1) is 1:0.18: 0.028.
The curing temperature in the step (1) is 45 ℃, and the curing time is 18 hours.
The prepressing pressure in the step (1) is 0.4MPa, and the time is 20 min.
The extrusion temperature of the extruder in the step (2) is 40 ℃.
The compression ratio of the extruder in the step (2) is 130; the speed of extruding the material strip is 1.5 m/min.
And (3) during rolling, the temperature of the roller is 50 ℃, the thickness of the rolled base band is 0.08mm, and the width of the rolled base band is 20 cm.
The degreasing temperature in the step (3) is 180 ℃; the purpose of drying is to evaporate the propellant.
The sintering and shaping temperature in the step (4) is 350 ℃.
And (3) longitudinally stretching the steel plate by multiple rollers with the total longitudinal stretching multiple of 4.5 times, wherein the number of the multiple rollers is 5, the stretching multiple of each roller is different, and the stretching multiple of each roller is 5%, 10%, 30% and 50% of the total longitudinal stretching multiple in sequence.
The net breaking in the step (4) adopts 4 groups of rollers, each group of rollers comprises two compression rollers with the same rotating speed which are arranged up and down, and the rotating speed of each group of rollers is 20m/min, 100m/min, 22m/min and 24m/min respectively.
And (4) carding the card clothing, wherein the diameter of the card wheel is 100mm, the needling density is 21 in 10mm, and the linear velocity of the card wheel is adjusted according to actual production equipment.
The number of crimps described in step (4) was 7/25 mm.
By adopting the preparation method described in the embodiment 2, the prepared polytetrafluoroethylene superfine short fiber has the length of 65mm, the fineness of 0.90D, the shrinkage rate of 3.0 percent, the tensile strength of 1.5N/dtex, the temperature resistance of-190-260 ℃ and the specific resistance value of 107Omega cm, and has good acid resistance, alkali resistance and hydrolysis resistance.
Example 3
The preparation method of the polytetrafluoroethylene superfine short fiber described in this embodiment 3 comprises the following steps:
(1) mixing PTFE dispersion resin particles, a boosting agent and a surfactant at low temperature, curing at high temperature, pre-pressing, and pre-pressing into a cylindrical blank;
(2) putting the blank into a pushing machine to obtain an extruded strip, and then putting the extruded strip into a calender to obtain an oil-containing base band;
(3) degreasing the oil-containing baseband in a degreasing machine to obtain a degreased baseband;
(4) putting the degreased base band on an unreeling platform of a carding machine, sintering and shaping while longitudinally stretching, breaking the obtained PTFE film to enable the PTFE film to be in a uniform grid state, then conveying the PTFE film to a carding device, carding the PTFE film into fine wire harnesses in the grid state through card clothing, bundling the obtained wire harnesses by a buncher, and finally curling, cutting and opening to obtain the PTFE short fiber.
Wherein:
the low-temperature mixing temperature in the step (1) is 20 ℃, the mixing time is 30min, and the mixing and stirring temperature is controlled at 20 ℃, so that the pre-forming fibril of the PTFE dispersion resin is prevented.
The particle size of the PTFE dispersion resin particle material in the step (1) is 300-600 microns.
The boosting agent in the step (1) is kerosene.
The surfactant in the step (1) is 2- (3' -perfluorooctyl) propoxy-1, 2, 3-tricarballylic acid.
The mixing mass ratio of the PTFE dispersion resin particles, the boosting agent and the surfactant in the step (1) is 1:0.18: 0.025.
The curing temperature in the step (1) is 50 ℃, and the curing time is 24 hours.
The prepressing pressure in the step (1) is 0.6MPa, and the time is 30 min.
The extrusion temperature of the extruder in the step (2) is 45 ℃.
The compression ratio of the extruder in the step (2) is 100; the speed of extruding the material strip is 0.8 m/min.
And (3) during rolling, the temperature of the roller is 55 ℃, the thickness of the rolled base band is 0.05mm, and the width of the rolled base band is 15 cm.
The degreasing temperature in the step (3) is 200 ℃, and the drying aims to volatilize the boosting agent.
The sintering and shaping temperature in the step (4) is 335 ℃.
And (3) longitudinally stretching the steel plate by multiple rollers with the total longitudinal stretching multiple of 5 times in the step (4), wherein the number of the multiple rollers is 5, the stretching multiple of each roller is different, and the stretching multiple of each roller is 5%, 10%, 30% and 50% of the total longitudinal stretching multiple in sequence.
The net breaking in the step (4) adopts 4 groups of rollers, each group of rollers comprises two compression rollers with the same rotating speed which are arranged up and down, and the rotating speed of each group of rollers is 20m/min, 100m/min, 22m/min and 24m/min respectively.
And (4) carding the card clothing in the step (4), wherein the diameter of the card clothing is 150mm, the needling density is 22 in 10mm, and the linear speed of the card clothing is adjusted according to actual production equipment.
The number of crimps described in step (4) is 8/25 mm.
The polytetrafluoroethylene superfine short fiber prepared by the preparation method of the embodiment 3 has the length60mm, fineness of 0.82D, shrinkage of 2.7%, tensile strength of 1.3N/dtex, temperature resistance of-190-260 deg.C, and specific resistance of 107Omega cm, and has good acid resistance, alkali resistance and hydrolysis resistance.
Comparative example 1
The method for preparing the polytetrafluoroethylene superfine staple fiber according to comparative example 1 is the same as that of example 1, and the only difference is that the longitudinal stretching ratio in step (4) is different, and the longitudinal stretching ratio in step (4) of comparative example 1 is 8.
By adopting the preparation method of the comparative example 1, the prepared polytetrafluoroethylene superfine short fiber has the fineness of 0.70D, the tensile strength of 0.8N/dtex and little change of other parameters.
Comparative example 2
The preparation method of the polytetrafluoroethylene superfine short fiber in the comparative example 2 is the same as that in the example 1, and the only difference is that the rotating speeds of the rollers are different when the web is broken in the step (4), 4 groups of rollers are adopted for the web breaking in the step (4) in the comparative example 2, each group of rollers comprises two compression rollers with the same rotating speed which are arranged up and down, and the rotating speed of each group of rollers is respectively 20m/min, 50m/min, 22m/min and 24 m/min.
By adopting the preparation method of the comparative example 2, the prepared polytetrafluoroethylene superfine short fiber has the fineness of 1.5D and the tensile strength of 1.7N/dtex, and the other parameters are not changed greatly.
Comparative example 3
The method for preparing the polytetrafluoroethylene superfine staple fiber according to comparative example 3 is the same as that of example 1, and the only difference is that the card clothing in step (4) is carded, the diameter of the pin wheel and the needling density are different from those of example 1, and the diameter of the pin wheel in comparative example 3 is 150mm, and the needling density is 30 within 10 mm. By adopting the preparation method of the comparative example 3, the prepared polytetrafluoroethylene superfine short fiber has the fineness of 0.70D, the tensile strength of 0.8N/dtex and little change of other parameters.

Claims (10)

1. A preparation method of polytetrafluoroethylene superfine short fibers is characterized by comprising the following steps: the method comprises the following steps:
(1) mixing PTFE dispersion resin particles, a boosting agent and a surfactant at low temperature, curing at high temperature, pre-pressing, and pre-pressing into a cylindrical blank;
(2) putting the blank into a pushing machine to obtain an extruded strip, and then putting the extruded strip into a calender to obtain an oil-containing base band;
(3) degreasing the oil-containing baseband in a degreasing machine to obtain a degreased baseband;
(4) putting the degreased base band on an unreeling platform of a carding machine, sintering and shaping while longitudinally stretching, breaking the obtained PTFE film to enable the PTFE film to be in a uniform grid state, then conveying the PTFE film to a carding device, carding the PTFE film into fine wire harnesses in the grid state through card clothing, bundling the obtained wire harnesses by a buncher, and finally curling, cutting and opening to obtain the PTFE short fiber.
2. The method for preparing polytetrafluoroethylene superfine staple fiber according to claim 1, wherein: the low-temperature mixing temperature in the step (1) is 20-25 ℃, and the mixing time is 15-30 min; the particle size of the PTFE dispersion resin particle material is 300-600 microns.
3. The method for preparing polytetrafluoroethylene superfine staple fiber according to claim 1, wherein: the boosting agent in the step (1) is one of kerosene or white oil; the surfactant is one of polyoxyethylene dodecyl ether or 2- (3' -perfluorooctyl) propoxy-1, 2, 3-tricarballylic acid.
4. The method for preparing polytetrafluoroethylene superfine staple fiber according to claim 1, wherein: the mixing mass ratio of the PTFE dispersion resin particles, the boosting agent and the surfactant in the step (1) is 1:0.18-0.2: 0.025-0.03;
the curing temperature in the step (1) is 40-50 ℃, and the curing time is 12-24 hours;
the prepressing pressure in the step (1) is 0.1-0.6MPa, and the time is 10-30 min.
5. The method for preparing polytetrafluoroethylene superfine staple fiber according to claim 1, wherein: the extrusion temperature of the extruder in the step (2) is 30-50 ℃; the roller temperature during rolling is 30-60 ℃, the thickness of the rolled base band is 0.05-0.15mm, and the width is 15-35 cm; the compression ratio of the extruder is 100-150; the speed of the extruded material strip is 0.8-1 m/min.
6. The method for preparing polytetrafluoroethylene superfine staple fiber according to claim 1, wherein: the degreasing temperature in the step (3) is 130-200 ℃; the sintering and shaping temperature in the step (4) is 330-350 ℃.
7. The method for preparing polytetrafluoroethylene superfine staple fiber according to claim 1, wherein: and (3) longitudinally stretching the steel plate by multiple rollers at a total longitudinal stretching multiple of 4-5 times, wherein the number of the multiple rollers is 5, the stretching multiple of each roller is different, and the stretching multiple of each roller is 5%, 10%, 30% and 50% of the total stretching multiple in sequence.
8. The method for preparing polytetrafluoroethylene superfine staple fiber according to claim 1, wherein: the net breaking in the step (4) adopts 4 groups of rollers, each group of rollers comprises two compression rollers with the same rotating speed which are arranged up and down, and the rotating speed of each group of rollers is 20m/min, 100m/min, 22m/min and 24m/min respectively.
9. The method for preparing polytetrafluoroethylene superfine staple fiber according to claim 1, wherein: and (4) carding the card clothing in the step (4), wherein the diameter of the card wheel is 100-150mm, and the needling density is 20-22 in 10 mm.
10. The method for preparing polytetrafluoroethylene superfine staple fiber according to claim 1, wherein: the number of crimps in step (4) is 6-8 per 25 mm.
CN202110258043.XA 2021-03-09 2021-03-09 Preparation method of polytetrafluoroethylene superfine short fiber Active CN113026130B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110258043.XA CN113026130B (en) 2021-03-09 2021-03-09 Preparation method of polytetrafluoroethylene superfine short fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110258043.XA CN113026130B (en) 2021-03-09 2021-03-09 Preparation method of polytetrafluoroethylene superfine short fiber

Publications (2)

Publication Number Publication Date
CN113026130A true CN113026130A (en) 2021-06-25
CN113026130B CN113026130B (en) 2022-08-02

Family

ID=76468711

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110258043.XA Active CN113026130B (en) 2021-03-09 2021-03-09 Preparation method of polytetrafluoroethylene superfine short fiber

Country Status (1)

Country Link
CN (1) CN113026130B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117107369A (en) * 2023-10-18 2023-11-24 山东森荣新材料股份有限公司 Short fiber production device and process

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994023098A1 (en) * 1993-04-05 1994-10-13 Daikin Industries, Ltd. Polytetrafluoroethylene fiber, cottony material containing the same, and process for producing the same
CN1152948A (en) * 1994-06-30 1997-06-25 大金工业株式会社 Bulky long fibre and split yarn of polytetrafluoroethylene, method of mfg. the same, cotton like material mfg. method using the fiber and yarn, and dust collecting filter cloth
CN101985783A (en) * 2010-10-20 2011-03-16 山东嘉年华氟纶有限公司 Polytetrafluoroethylene fiber with antistatic function of and preparation method thereof
CN102560714A (en) * 2010-12-27 2012-07-11 山东嘉年华氟纶有限公司 PTFE (Polytetrafluoroethylene) low-shrinkage crimped chopped fiber for filter needled-punched felt and manufacturing method of PTFE low-shrinkage crimped chopped fiber
CN105199131A (en) * 2015-09-01 2015-12-30 北京汉能光伏投资有限公司 Preparation method and application of polytetrafluoroethylene film for unmanned aerial vehicle
CN106149078A (en) * 2015-04-10 2016-11-23 南京英斯瑞德高分子材料有限公司 A kind of production technology of PTFE long and short fiber
CN110655756A (en) * 2019-10-22 2020-01-07 上海桐翠新材料科技有限公司 Hydrophobic epoxy resin for outdoor electrical insulation and preparation method thereof
CN111763573A (en) * 2019-04-02 2020-10-13 昆山欣谷微电子材料有限公司 Alkaline glass substrate cleaning fluid composition

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994023098A1 (en) * 1993-04-05 1994-10-13 Daikin Industries, Ltd. Polytetrafluoroethylene fiber, cottony material containing the same, and process for producing the same
CN1152948A (en) * 1994-06-30 1997-06-25 大金工业株式会社 Bulky long fibre and split yarn of polytetrafluoroethylene, method of mfg. the same, cotton like material mfg. method using the fiber and yarn, and dust collecting filter cloth
CN101985783A (en) * 2010-10-20 2011-03-16 山东嘉年华氟纶有限公司 Polytetrafluoroethylene fiber with antistatic function of and preparation method thereof
CN102560714A (en) * 2010-12-27 2012-07-11 山东嘉年华氟纶有限公司 PTFE (Polytetrafluoroethylene) low-shrinkage crimped chopped fiber for filter needled-punched felt and manufacturing method of PTFE low-shrinkage crimped chopped fiber
CN106149078A (en) * 2015-04-10 2016-11-23 南京英斯瑞德高分子材料有限公司 A kind of production technology of PTFE long and short fiber
CN105199131A (en) * 2015-09-01 2015-12-30 北京汉能光伏投资有限公司 Preparation method and application of polytetrafluoroethylene film for unmanned aerial vehicle
CN111763573A (en) * 2019-04-02 2020-10-13 昆山欣谷微电子材料有限公司 Alkaline glass substrate cleaning fluid composition
CN110655756A (en) * 2019-10-22 2020-01-07 上海桐翠新材料科技有限公司 Hydrophobic epoxy resin for outdoor electrical insulation and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
《简明化学试剂手册》编写组: "《简明化学试剂手册》", 29 January 1999, 上海科学技术出版社出版社 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117107369A (en) * 2023-10-18 2023-11-24 山东森荣新材料股份有限公司 Short fiber production device and process
CN117107369B (en) * 2023-10-18 2023-12-22 山东森荣新材料股份有限公司 Short fiber production device and process

Also Published As

Publication number Publication date
CN113026130B (en) 2022-08-02

Similar Documents

Publication Publication Date Title
CN113026130B (en) Preparation method of polytetrafluoroethylene superfine short fiber
CN103451758B (en) Polytetrafluoroethylene ultrafine fiber
CN100447317C (en) Method for preparing expanded polytetrafluoroethylene fiber for exhaust decomposition
CN108176256B (en) Preparation method of high-temperature-resistant composite nanofiber filtering membrane
CN106012296A (en) Composite non-woven filter material and preparation method thereof
CN102965752B (en) Cellulose in-situ urea modified plastification melt spinning method
CN106637451A (en) Method for preparing polytetrafluoroethylene microfibers
CN113480328A (en) Large-scale graphene heat-conducting roll film and preparation method thereof
CN115012050A (en) Production process of PHBV and PLA blended bio-based fiber
JPS63315655A (en) Polyphenylene sulfide melt blow nonwoven fabric and its production
CN100425332C (en) Preparation method of membrane-covered filter material for high-temperature flue gas/dust integrated treatment
CN115506040B (en) Spinning method for directly melting and extruding polyphenylene sulfide powder
CN105498361A (en) Polyester-ultrafine fiber composite nonwoven filter felt and making method thereof
CN115300996A (en) High-temperature-resistant hydraulic composite glass fiber filter material, preparation process thereof and composite device
CN115522320A (en) Preparation method of high-modulus polytetrafluoroethylene nanofiber membrane
CN114887398A (en) Biodegradable air filter material and preparation method thereof
CN112717728B (en) PTFE macroporous membrane and preparation method and application thereof
CN114517355A (en) Degradable non-woven fabric and preparation method and application thereof
CN111058191B (en) High-strength short fiber needle-punched geotextile and preparation method thereof
CN110184674B (en) Sheath-core porous composite fiber and preparation method thereof
CN113893616B (en) Magnetic filter material and application thereof
CN114953661B (en) Mildew-proof flame-retardant basalt fiber composite material for automobile ceiling and manufacturing method thereof
CN115354413B (en) Production method of boron carbide modified polyphenylene sulfide fiber
CN117643764A (en) Preparation method of PTFE (polytetrafluoroethylene) coated filter material easy to clean
CN116651224A (en) Denitration PTFE composite membrane, preparation method and application thereof, and dedusting and denitration integrated composite filter material

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant