CN114801236A - Method for manufacturing expanded polytetrafluoroethylene composite material - Google Patents

Method for manufacturing expanded polytetrafluoroethylene composite material Download PDF

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CN114801236A
CN114801236A CN202110127115.7A CN202110127115A CN114801236A CN 114801236 A CN114801236 A CN 114801236A CN 202110127115 A CN202110127115 A CN 202110127115A CN 114801236 A CN114801236 A CN 114801236A
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extruder
adjusting
expanded polytetrafluoroethylene
temperature
rolling
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CN202110127115.7A
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汪梦
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Shenzhen Shengan Technology Co ltd
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Shenzhen Shengan Technology Co ltd
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • 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
    • B29K2507/00—Use of elements other than metals as filler
    • B29K2507/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C08K3/042—Graphene or derivatives, e.g. graphene oxides

Abstract

The invention relates to the technical field of composite materials, in particular to a method for manufacturing an expanded polytetrafluoroethylene composite material, which comprises the following specific steps: s1, mixing: uniformly mixing PTFE resin with alkane or other solvent oil, adding 10 +/-0.5% of graphene, placing in a rolling stirring device, and mixing and stirring; s2, preprocessing: the uniformly mixed materials are placed in an oven, the temperature is adjusted to be 55 +/-1 ℃, the materials are baked for 8-12 hours, a certain proportion of powdered graphite is added in the manufacturing process of the E-PTFE, the properties of abrasion resistance, small friction force, easy extension and the like of the graphite are utilized, the graphite is uniformly dispersed in an E-PTFE film after being manufactured, and finally the formed composite material has the chemical stability, the material compliance, the property of easy integral forming with a plastic material, the abrasion resistance and the low friction force of the graphite, so that the composite material has better abrasion resistance, low friction force and excellent chemical stability compared with the traditional sealing material, and the depth and the breadth of the original sealing industry can be changed.

Description

Method for manufacturing expanded polytetrafluoroethylene composite material
Technical Field
The invention relates to the technical field of composite materials, in particular to a method for manufacturing an expanded polytetrafluoroethylene composite material.
Background
Polytetrafluoroethylene (PTFE) has good corrosion resistance, antifriction property, self-lubricating property, temperature resistance and pressure resistance, is excellent engineering plastic and is widely applied to the fields of friction, corrosion resistance, sealing and the like. However, polytetrafluoroethylene is also deficient in certain properties, with the following disadvantages: 1) the sealing material used for dynamic contact at present is polytetrafluoroethylene or other plastic materials; 2) the materials have the problems of easy abrasion, large friction force, easy deformation of sealing, leakage and the like in the use process;
in summary, the present invention solves the existing problems by devising a method for manufacturing an expanded polytetrafluoroethylene composite.
Disclosure of Invention
The present invention is directed to a method for producing an expanded polytetrafluoroethylene composite material, which solves the above-mentioned problems of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for manufacturing an expanded polytetrafluoroethylene composite material comprises the following specific steps:
s1, mixing: uniformly mixing PTFE resin with alkane or other solvent oil, adding 10 +/-0.5% of graphene, placing in a rolling stirring device, and mixing and stirring;
s2, preprocessing: placing the uniformly mixed materials in an oven, adjusting the temperature to 55 +/-1 ℃, and baking for 8-12 hours;
s3, pressing: putting the baked material into a briquetting machine, adjusting the pressure to be 5 +/-0.5 MPa, and keeping the pressure for 120 seconds after compression molding;
s4, extrusion: placing the material subjected to compression molding in an extruder, adjusting the extrusion temperature to 50 +/-2 ℃, and extruding to be pressed;
s5, calendering, namely, putting the extruded rod-shaped material into a calender to calender, adjusting the calendering temperature to be 70 +/-2 ℃, the calendering speed to be about 3 +/-0.5 m/min, controlling the calendering thickness to be 0.25 +/-0.05 mm, and rolling by using an automatic material receiving machine;
s6, degreasing: degreasing the rolled membrane material in an oven, adjusting the degreasing temperature to 200 +/-5 ℃, and the degreasing speed to 4 +/-0.5 m/min, and rolling the membrane material by using an automatic material receiving machine;
s7, stretching: stretching the degreased membrane material in an oven, adjusting the stretching temperature to 240 +/-5 ℃, the stretching magnification to 4 +/-0.5 times, the initial speed to 7 +/-0.5 m/min, and winding by using an automatic material receiving machine;
s8, sintering: sintering the stretched membrane material in an oven at the sintering temperature of 365 +/-5 ℃ and the sintering speed of 4 +/-0.5 m/min, and rolling by using an automatic material receiving machine to obtain the required material;
preferably, the PTFE resin in S1 is weighed at 500 parts by weight and 10 ± 0.5% of graphene is added to 500 parts of the PTFE resin.
Preferably, the stirring speed of the tumbling stirring equipment in the step S1 is 300-400 rpm/min, and the mixing and stirring are continuously carried out for 1-2 h.
Preferably, the alkane or other solvent in S1 is one of N-hexane, acetone, toluene, chloroform, and N, N-dimethylformamide.
Preferably, the melt pressure of the extruder in S4 is controlled to be 1.01-1.2 MPa, the rear end of the extruder is vacuumized, and the rotating speed of the extruder is 660-700 r/min.
Preferably, a surface modifier is added into the extruder in S4 during the extrusion process of the extruder, wherein the surface modifier is one of a silane coupling agent, a titanate coupling agent and a rare earth coupling agent.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, through designing in the manufacturing process of the E-PTFE, a certain proportion of powdered graphite is added, and the graphite has the properties of wear resistance, small friction force, easy extensibility and the like, and is uniformly dispersed in the E-PTFE film after being manufactured, so that the finally formed composite material has the chemical stability, material compliance, performance of easy integral molding with a plastic material and the wear resistance and low friction force performance of the graphite, thereby having better wear resistance, low friction force and excellent chemical stability compared with the traditional sealing material, and changing the depth and breadth of the original sealing industry, thereby solving the problems that the sealing material used for dynamic contact is polytetrafluoroethylene or other plastic materials at present, and the materials are easy to wear, large in friction force, easy to deform in the use process to cause leakage and the like.
Drawings
FIG. 1 is a schematic view of the manufacturing process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution:
a method for manufacturing an expanded polytetrafluoroethylene composite material comprises the following specific steps:
s1, mixing: uniformly mixing PTFE resin with alkane or other solvent oil, adding 10 +/-0.5% of graphene, placing in a rolling stirring device, and mixing and stirring;
s2, preprocessing: placing the uniformly mixed materials in an oven, adjusting the temperature to 55 +/-1 ℃, and baking for 8-12 hours;
s3, pressing: putting the baked material into a briquetting machine, adjusting the pressure to be 5 +/-0.5 MPa, and keeping the pressure for 120 seconds after compression molding;
s4, extrusion: placing the material subjected to compression molding in an extruder, adjusting the extrusion temperature to 50 +/-2 ℃, and extruding to be pressed;
s5, calendering, namely, putting the extruded rod-shaped material into a calender to calender, adjusting the calendering temperature to be 70 +/-2 ℃, the calendering speed to be about 3 +/-0.5 m/min, controlling the calendering thickness to be 0.25 +/-0.05 mm, and rolling by using an automatic material receiving machine;
s6, degreasing: degreasing the rolled membrane material in an oven, adjusting the degreasing temperature to 200 +/-5 ℃, and the degreasing speed to 4 +/-0.5 m/min, and rolling the membrane material by using an automatic material receiving machine;
s7, stretching: stretching the degreased membrane material in an oven, adjusting the stretching temperature to 240 +/-5 ℃, the stretching magnification to 4 +/-0.5 times, the initial speed to 7 +/-0.5 m/min, and winding by using an automatic material receiving machine;
s8, sintering: sintering the stretched membrane material in an oven at the sintering temperature of 365 +/-5 ℃ and the sintering speed of 4 +/-0.5 m/min, and rolling by using an automatic material receiving machine to obtain the required material;
further, the PTFE resin in S1 is weighed at 500 parts by weight and 10 ± 0.5% of graphene is added to 500 parts of the PTFE resin.
Further, in the step S1, the stirring speed of the rolling stirring equipment is 300-400 rpm/min, and the mixing and stirring are continuously carried out for 1-2 hours.
Further, the alkane or other solvent in the S1 is one of N-hexane, acetone, toluene, chloroform and N, N-dimethylformamide.
Further, the melt pressure of the extruder in the S4 is controlled to be 1.01-1.2 MPa, the rear end of the extruder is vacuumized, and the rotating speed of the extruder is 660-700 r/min.
Further, a surface modifier is added into the extruder in the extrusion process of the extruder in S4, wherein the surface modifier is one of a silane coupling agent, a titanate coupling agent and a rare earth coupling agent.
The implementation case is as follows:
step 1, mixing materials: weighing 500 parts of PTFE resin according to the weight parts, adding 10 +/-0.5% of graphene into 500 parts of PTFE resin, placing the mixture into a rolling stirring device, mixing and stirring, wherein the stirring speed of the rolling stirring device is 300-400 rpm/min, and continuously mixing and stirring for 1-2 hours;
step 2, pretreatment: placing the uniformly mixed materials in an oven, adjusting the temperature to 55 +/-1 ℃, and baking for 8-12 hours;
step 3, pressing: putting the baked material into a briquetting machine, adjusting the pressure to be 5 +/-0.5 MPa, and keeping the pressure for 120 seconds after compression molding;
step 4, extruding: placing the material subjected to compression molding in an extruder, adding a surface modifier into the extruder in the extrusion process of the extruder, wherein the surface modifier is one of a silane coupling agent, a titanate coupling agent and a rare earth coupling agent, adjusting the extrusion temperature to 50 +/-2 ℃, extruding for pressing, controlling the melt pressure of the extruder to be 1.01-1.2 MPa, vacuumizing the rear end of the extruder, and controlling the rotating speed of the extruder to be 660-700 r/min;
step 5, calendering, namely placing the extruded rod-shaped material into a calender to calender, adjusting the calendering temperature to be 70 +/-2 ℃, the calendering speed to be about 3 +/-0.5 m/min, controlling the calendering thickness to be 0.25 +/-0.05 mm, and rolling by using an automatic material receiving machine;
step 6, degreasing: degreasing the rolled membrane material in an oven, adjusting the degreasing temperature to 200 +/-5 ℃, and the degreasing speed to 4 +/-0.5 m/min, and rolling the membrane material by using an automatic material receiving machine;
step 7, stretching: stretching the degreased membrane material in an oven, adjusting the stretching temperature to 240 +/-5 ℃, the stretching magnification to 4 +/-0.5 times, the initial speed to 7 +/-0.5 m/min, and winding by using an automatic material receiving machine;
and 8, sintering: and (3) sintering the stretched membrane material in an oven at the sintering temperature of 365 +/-5 ℃ and the sintering speed of 4 +/-0.5 m/min, and rolling by using an automatic material receiving machine to obtain the required material.
Comparative example
The only difference between the comparative example and the embodiment of the method for manufacturing the expanded polytetrafluoroethylene composite material is as follows: the expanded polytetrafluoroethylene composite material does not contain powder graphite in the component composition, and the weight ratio of the other components is consistent; 3.5-6.0
TABLE 1 comparison of Properties and parameters of expanded PTFE composites
Figure BDA0002924374380000051
By comparing the embodiment and the comparative example, by designing in the manufacturing process of E-PTFE, adding a certain proportion of powdered graphite, making use of the properties of wear resistance, small friction force, easy extensibility and the like of the graphite, uniformly dispersing the graphite in an E-PTFE membrane after manufacturing, the finally formed composite material has the chemical stability, material compliance, performance of easy integral molding with plastic materials, wear resistance and low friction performance of the graphite of the E-PTFE, thereby having better wear resistance, low friction and excellent chemical stability compared with the traditional sealing material, changing the depth and the breadth of the original sealing industry, therefore, the problems that the existing sealing material for dynamic contact is made of polytetrafluoroethylene or other plastic materials, and the materials are easy to wear, large in friction force, easy to deform in sealing and cause leakage in the using process are solved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. A method for manufacturing an expanded polytetrafluoroethylene composite material comprises the following specific steps:
s1, mixing: uniformly mixing PTFE resin with alkane or other solvent oil, adding 10 +/-0.5% of graphene, placing in a rolling stirring device, and mixing and stirring;
s2, pretreatment: placing the uniformly mixed materials in an oven, adjusting the temperature to 55 +/-1 ℃, and baking for 8-12 hours;
s3, pressing: putting the baked material into a briquetting machine, adjusting the pressure to be 5 +/-0.5 MPa, and keeping the pressure for 120 seconds after compression molding;
s4, extrusion: placing the material subjected to compression molding in an extruder, adjusting the extrusion temperature to 50 +/-2 ℃, and extruding to be pressed;
s5, calendering, namely, putting the extruded rod-shaped material into a calender to calender, adjusting the calendering temperature to be 70 +/-2 ℃, the calendering speed to be about 3 +/-0.5 m/min, controlling the calendering thickness to be 0.25 +/-0.05 mm, and rolling by using an automatic material receiving machine;
s6, degreasing: degreasing the rolled membrane material in an oven, adjusting the degreasing temperature to 200 +/-5 ℃, and the degreasing speed to 4 +/-0.5 m/min, and rolling the membrane material by using an automatic material receiving machine;
s7, stretching: stretching the degreased membrane material in an oven, adjusting the stretching temperature to 240 +/-5 ℃, the stretching ratio to 4 +/-0.5 times, the initial speed to 7 +/-0.5 m/min, and winding by using an automatic material receiving machine;
s8, sintering: and (3) sintering the stretched membrane material in an oven at the sintering temperature of 365 +/-5 ℃ at the sintering speed of 4 +/-0.5 m/min, and rolling by using an automatic material receiving machine to obtain the required material.
2. The method of claim 1, wherein the expanded polytetrafluoroethylene composite is prepared by: the PTFE resin in S1 is weighed at 500 parts by weight and 10 ± 0.5% graphene is added to 500 parts of the PTFE resin.
3. The method of claim 1, wherein the expanded polytetrafluoroethylene composite is prepared by: and in the S1, the stirring speed of the rolling stirring equipment is 300-400 rpm/min, and the mixture is continuously mixed and stirred for 1-2 hours.
4. The method of claim 1, wherein the expanded polytetrafluoroethylene composite is prepared by: the alkane or other solvent in the S1 is one of N-hexane, acetone, toluene, chloroform and N, N-dimethylformamide.
5. The method of claim 1, wherein the expanded polytetrafluoroethylene composite is prepared by: and controlling the melt pressure of the extruder in the S4 to be 1.01-1.2 MPa, vacuumizing the rear end of the extruder, and controlling the rotating speed of the extruder to be 660-700 r/min.
6. The method of claim 1, wherein the expanded polytetrafluoroethylene composite is prepared by: and adding a surface modifier into the extruder in the S4 in the extrusion process of the extruder, wherein the surface modifier is one of a silane coupling agent, a titanate coupling agent and a rare earth coupling agent.
CN202110127115.7A 2021-01-29 2021-01-29 Method for manufacturing expanded polytetrafluoroethylene composite material Pending CN114801236A (en)

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