CN110789213A - Polyurethane and polytetrafluoroethylene compounding process - Google Patents
Polyurethane and polytetrafluoroethylene compounding process Download PDFInfo
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- CN110789213A CN110789213A CN201911086357.5A CN201911086357A CN110789213A CN 110789213 A CN110789213 A CN 110789213A CN 201911086357 A CN201911086357 A CN 201911086357A CN 110789213 A CN110789213 A CN 110789213A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/12—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polysiloxanes
- C08F283/124—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polysiloxanes on to polysiloxanes having carbon-to-carbon double bonds
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- 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
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J127/00—Adhesives based on 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; Adhesives based on derivatives of such polymers
- C09J127/02—Adhesives based on 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; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J127/12—Adhesives based on 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; Adhesives based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- 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
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- 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
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- 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
- C08J2427/00—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
- C08J2427/02—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
- C08J2427/12—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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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Abstract
The invention discloses a polyurethane and polytetrafluoroethylene compounding process, which comprises the following steps: b1, weighing polyurethane, and then preparing a PU film by injection molding; b2, weighing polytetrafluoroethylene and polychlorotrifluoroethylene, and then preparing a PTFE composite membrane by injection molding; b3, respectively passing through glue spreader to coat a high-temperature resistant adhesive on the composite bonding surface between the PU film and the PTFE composite film; b4, and then carrying out hot-pressing compounding on the PU film and the PTFE composite film through a compounding roller; and B5, sending the mixture into an oven, baking and curing the mixture, naturally cooling the mixture, and discharging the mixture. The polyurethane and polytetrafluoroethylene compounding process can well compound polyurethane and polytetrafluoroethylene together to form a composite material, and the polyurethane and polytetrafluoroethylene have large 180-degree stripping force, large adhesive force, firm compounding and bonding and good mechanical property; can be used for a long time in a high-temperature environment of 110-120 ℃.
Description
Technical Field
The invention relates to the field of composite materials, in particular to a process for compounding polyurethane and polytetrafluoroethylene.
Background
Polyurethanes, which are polymers containing urethane groups in the main chain of a macromolecule, are called polyurethanes, and are classified into two major classes, polyester polyurethanes and polyether polyurethanes. Polyurethanes have many excellent properties and therefore have a wide range of uses.
Polytetrafluoroethylene (abbreviated as PTFE), is commonly referred to as a "non-stick coating" or "easy-to-clean material". The material has the characteristics of acid resistance, alkali resistance and various organic solvents resistance, and is almost insoluble in all solvents. Meanwhile, the polytetrafluoroethylene has the characteristic of high temperature resistance, has extremely low friction coefficient, can be used for lubricating, and becomes an ideal coating for easily cleaning the inner layer of the water pipe.
The application of any material has its limitations, and the development of composite technology integrates the advantages of different materials and improves the resistance of a single material to its working environment. The polyurethane material has excellent wear resistance, but has high friction coefficient, large internal heat generation, poor heat conduction effect of a contact surface and rapid heat accumulation, so that the mechanical property of the polyurethane material is reduced. The PTFE material has the advantages of heat resistance of more than 200 ℃, low friction coefficient, good heat conductivity, poor elastic property and easy plastic deformation or fragmentation.
At present, the domestic research on the polyurethane and PTFE composite process is still in the laboratory stage and does not meet the requirement of industrial mass production. The main reasons for such phenomena are that the polyurethane materials are not applied to a deep degree, are not sufficiently researched for diversified applications, and have high cost, so that the polyurethane materials mostly stay in the theoretical stage of a laboratory. The research aims to solve the industrial production demand of the polyurethane and PTFE composite process and realize the breakthrough of the composite process from an experimental theory stage to an actual application stage.
Based on the situation, the invention provides a polyurethane and polytetrafluoroethylene composite process, which can enable the product to be used for a long time in a high-temperature environment of 110-120 ℃ and can effectively solve the problems.
Disclosure of Invention
The invention aims to provide a composite process of polyurethane and polytetrafluoroethylene. The polyurethane and polytetrafluoroethylene compounding process can well compound polyurethane and polytetrafluoroethylene together to form a composite material, and the polyurethane and polytetrafluoroethylene have large 180-degree stripping force, large adhesive force, firm compounding and bonding and good mechanical property; the advantages of two different materials of polyurethane and polytetrafluoroethylene can be integrated, the resistance of a single material to the working environment of the single material is improved, and the material can be used for a long time in a high-temperature environment of 110-120 ℃.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a composite process of polyurethane and polytetrafluoroethylene comprises the following steps:
b1, weighing polyurethane, drying at 120-125 ℃ in vacuum until the water content is less than 50ug/g, feeding into a single-screw extruder for melting, and then preparing a PU film by injection molding;
b2, weighing polytetrafluoroethylene and polytrifluorochloroethylene, drying at 120-125 ℃ in vacuum until the water content is less than 50ug/g, feeding into a double-screw extruder for melting and mixing, and then preparing a PTFE composite membrane by injection molding;
b3, naturally cooling the PU film and the PTFE composite film to 50-55 ℃, and stretching and shaping; then respectively passing through glue spreader rollers to coat a high-temperature resistant adhesive on the composite bonding surface between the PU film and the PTFE composite film;
b4, carrying out hot-pressing compounding on the PU film and the PTFE composite film through a compounding roller to obtain a composite film of polyurethane and polytetrafluoroethylene;
and B5, feeding the composite film of polyurethane and polytetrafluoroethylene into an oven, baking and curing, naturally cooling, and discharging to complete the compounding of polyurethane and polytetrafluoroethylene.
The polyurethane and polytetrafluoroethylene compounding process can well compound polyurethane and polytetrafluoroethylene together to form a composite material, and the polyurethane and polytetrafluoroethylene have large 180-degree stripping force, large adhesive force, firm compounding and bonding and good mechanical property; the advantages of two different materials of polyurethane and polytetrafluoroethylene can be integrated, the resistance of a single material to the working environment of the single material is improved, and the material can be used for a long time in a high-temperature environment of 110-120 ℃.
The preparation process is simple, the operation is simple and convenient, and the manpower and equipment cost are saved.
Preferably, in the step B2, the weighing of polytetrafluoroethylene and polychlorotrifluoroethylene is specifically to weigh 92 to 96 parts by weight of polytetrafluoroethylene and 4 to 8 parts by weight of polychlorotrifluoroethylene.
Preferably, in step B3, the high temperature resistant adhesive is prepared from the following raw materials in parts by weight: 12-14 parts of dimethyl acryloyl oxyethyl polysiloxane, 10-13 parts of acrylamide, 7-10 parts of tripropylene glycol diacrylate, 8-12 parts of isodecyl acrylate, 35-40 parts of butanone, 1.1-1.5 parts of azobisisobutyronitrile, 0.6-0.8 part of dodecyl mercaptan, 3-5 parts of 2-methyl-1, 8-octanediol, 15-20 parts of polychlorotrifluoroethylene powder and 2-3 parts of diphenylmethane diisocyanate.
Preferably, in step B3, the high temperature resistant adhesive is prepared from the following raw materials in parts by weight: 13 parts of dimethyl acryloyl oxyethyl polysiloxane, 12.1 parts of acrylamide, 8.5 parts of tripropylene glycol diacrylate, 10.3 parts of isodecyl acrylate, 37 parts of butanone, 1.3 parts of azodiisobutyronitrile, 0.7 part of dodecanethiol, 4.2 parts of 2-methyl-1, 8-octanediol, 17.8 parts of polychlorotrifluoroethylene powder and 2.6 parts of diphenylmethane diisocyanate.
Preferably, in step B3, the preparation method of the high temperature resistant adhesive comprises the following steps:
s1, weighing the following components in parts by weight: dimethyl acryloxyethyl polysiloxane, acrylamide, tripropylene glycol diacrylate, isodecyl acrylate, butanone, azobisisobutyronitrile, dodecanethiol, 2-methyl-1, 8-octanediol, polychlorotrifluoroethylene powder, and diphenylmethane diisocyanate;
s2, putting dimethyl acryloyloxyethyl polysiloxane, acrylamide, tripropylene glycol diacrylate, isodecyl acrylate and butanone into a reaction kettle, stirring, mixing, vacuumizing, dissolving to form a uniform solution, dissolving azobisisobutyronitrile and dodecanethiol with a small amount of butanone respectively, heating to 79-81 ℃, dissolving azobisisobutyronitrile and dodecanethiol with a small amount of butanone respectively, beginning to dropwise add azobisisobutyronitrile and dodecanethiol, keeping 79-81 ℃ after dropwise adding is completed within 30-40 min, continuing to react for 5-7 h, and discharging to obtain a high-temperature resistant adhesive semi-finished product solution;
s3, cooling the semi-finished product solution of the high-temperature resistant adhesive to 50-55 ℃, adding polychlorotrifluoroethylene powder, stirring at a high speed of 2000-2500 rpm, and vacuumizing to uniformly suspend and disperse the polychlorotrifluoroethylene powder in the semi-finished product solution of the high-temperature resistant adhesive; continuously stirring and adding 2-methyl-1, 8-octanediol, and uniformly mixing to obtain the high-temperature resistant adhesive; when in use, the diphenylmethane diisocyanate is added and mixed evenly.
Preferably, in the step B4, the rolling pressure for the hot-press compounding is 0.4 to 0.5 MPa.
Preferably, in the step B5, the baking and curing temperature is 75-85 ℃, and the baking time is 15-20 min.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the polyurethane and polytetrafluoroethylene compounding process can well compound polyurethane and polytetrafluoroethylene together to form a composite material, and the polyurethane and polytetrafluoroethylene have large 180-degree stripping force, large adhesive force, firm compounding and bonding and good mechanical property; the advantages of two different materials of polyurethane and polytetrafluoroethylene can be integrated, the resistance of a single material to the working environment of the single material is improved, and the material can be used for a long time in a high-temperature environment of 110-120 ℃.
The high-temperature-resistant adhesive disclosed by the invention is prepared by copolymerizing dimethyl acryloyloxyethyl polysiloxane, acrylamide, tripropylene glycol diacrylate and isodecyl acrylate serving as raw materials to obtain a copolymer adhesive, and the copolymer adhesive is good in heat resistance and strong in cohesiveness; the addition of the polychlorotrifluoroethylene powder can improve the fluidity of the high-temperature resistant adhesive in the invention and can improve the bonding force with the polytetrafluoroethylene film; the addition of 2-methyl-1, 8-octanediol and diphenylmethane diisocyanate moderately crosslinks the high temperature resistant adhesive of the present invention, further improving the adhesive strength and cohesive strength.
The preparation process is simple, the operation is simple and convenient, and the manpower and equipment cost are saved.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in connection with specific examples, which should not be construed as limiting the present patent.
The test methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise indicated, are conventionally obtained commercially or prepared by conventional methods.
Example 1:
a composite process of polyurethane and polytetrafluoroethylene comprises the following steps:
b1, weighing polyurethane, drying at 120-125 ℃ in vacuum until the water content is less than 50ug/g, feeding into a single-screw extruder for melting, and then preparing a PU film by injection molding;
b2, weighing polytetrafluoroethylene and polytrifluorochloroethylene, drying at 120-125 ℃ in vacuum until the water content is less than 50ug/g, feeding into a double-screw extruder for melting and mixing, and then preparing a PTFE composite membrane by injection molding;
b3, naturally cooling the PU film and the PTFE composite film to 50-55 ℃, and stretching and shaping; then respectively passing through glue spreader rollers to coat a high-temperature resistant adhesive on the composite bonding surface between the PU film and the PTFE composite film;
b4, carrying out hot-pressing compounding on the PU film and the PTFE composite film through a compounding roller to obtain a composite film of polyurethane and polytetrafluoroethylene;
and B5, feeding the composite film of polyurethane and polytetrafluoroethylene into an oven, baking and curing, naturally cooling, and discharging to complete the compounding of polyurethane and polytetrafluoroethylene.
Preferably, in the step B2, the weighing of polytetrafluoroethylene and polychlorotrifluoroethylene is specifically to weigh 92 to 96 parts by weight of polytetrafluoroethylene and 4 to 8 parts by weight of polychlorotrifluoroethylene.
Preferably, in step B3, the high temperature resistant adhesive is prepared from the following raw materials in parts by weight: 12-14 parts of dimethyl acryloyl oxyethyl polysiloxane, 10-13 parts of acrylamide, 7-10 parts of tripropylene glycol diacrylate, 8-12 parts of isodecyl acrylate, 35-40 parts of butanone, 1.1-1.5 parts of azobisisobutyronitrile, 0.6-0.8 part of dodecyl mercaptan, 3-5 parts of 2-methyl-1, 8-octanediol, 15-20 parts of polychlorotrifluoroethylene powder and 2-3 parts of diphenylmethane diisocyanate.
Preferably, in step B3, the high temperature resistant adhesive is prepared from the following raw materials in parts by weight: 13 parts of dimethyl acryloyl oxyethyl polysiloxane, 12.1 parts of acrylamide, 8.5 parts of tripropylene glycol diacrylate, 10.3 parts of isodecyl acrylate, 37 parts of butanone, 1.3 parts of azodiisobutyronitrile, 0.7 part of dodecanethiol, 4.2 parts of 2-methyl-1, 8-octanediol, 17.8 parts of polychlorotrifluoroethylene powder and 2.6 parts of diphenylmethane diisocyanate.
Preferably, in step B3, the preparation method of the high temperature resistant adhesive comprises the following steps:
s1, weighing the following components in parts by weight: dimethyl acryloxyethyl polysiloxane, acrylamide, tripropylene glycol diacrylate, isodecyl acrylate, butanone, azobisisobutyronitrile, dodecanethiol, 2-methyl-1, 8-octanediol, polychlorotrifluoroethylene powder, and diphenylmethane diisocyanate;
s2, putting dimethyl acryloyloxyethyl polysiloxane, acrylamide, tripropylene glycol diacrylate, isodecyl acrylate and butanone into a reaction kettle, stirring, mixing, vacuumizing, dissolving to form a uniform solution, dissolving azobisisobutyronitrile and dodecanethiol with a small amount of butanone respectively, heating to 79-81 ℃, dissolving azobisisobutyronitrile and dodecanethiol with a small amount of butanone respectively, beginning to dropwise add azobisisobutyronitrile and dodecanethiol, keeping 79-81 ℃ after dropwise adding is completed within 30-40 min, continuing to react for 5-7 h, and discharging to obtain a high-temperature resistant adhesive semi-finished product solution;
s3, cooling the semi-finished product solution of the high-temperature resistant adhesive to 50-55 ℃, adding polychlorotrifluoroethylene powder, stirring at a high speed of 2000-2500 rpm, and vacuumizing to uniformly suspend and disperse the polychlorotrifluoroethylene powder in the semi-finished product solution of the high-temperature resistant adhesive; continuously stirring and adding 2-methyl-1, 8-octanediol, and uniformly mixing to obtain the high-temperature resistant adhesive; when in use, the diphenylmethane diisocyanate is added and mixed evenly.
Preferably, in the step B4, the rolling pressure for the hot-press compounding is 0.4 to 0.5 MPa.
Preferably, in the step B5, the baking and curing temperature is 75-85 ℃, and the baking time is 15-20 min.
Example 2:
a composite process of polyurethane and polytetrafluoroethylene comprises the following steps:
b1, weighing polyurethane, drying at 120 ℃ in vacuum until the water content is less than 50ug/g, feeding the polyurethane into a single-screw extruder for melting, and then preparing a PU film by injection molding;
b2, weighing polytetrafluoroethylene and polytrifluorochloroethylene, drying at 120 ℃ in vacuum until the water content is less than 50ug/g, sending the mixture into a double-screw extruder for melting and mixing, and then preparing the PTFE composite membrane by injection molding;
b3, naturally cooling the PU film and the PTFE composite film to 50 ℃, and stretching and shaping; then respectively passing through glue spreader rollers to coat a high-temperature resistant adhesive on the composite bonding surface between the PU film and the PTFE composite film;
b4, carrying out hot-pressing compounding on the PU film and the PTFE composite film through a compounding roller to obtain a composite film of polyurethane and polytetrafluoroethylene;
and B5, feeding the composite film of polyurethane and polytetrafluoroethylene into an oven, baking and curing, naturally cooling, and discharging to complete the compounding of polyurethane and polytetrafluoroethylene.
In this embodiment, in step B2, the weighing of polytetrafluoroethylene and polychlorotrifluoroethylene is specifically weighing 92 parts by weight of polytetrafluoroethylene and 4 parts by weight of polychlorotrifluoroethylene.
In this embodiment, in step B3, the high temperature resistant adhesive is made from the following raw materials in parts by weight: 12 parts of dimethyl acryloyl oxyethyl polysiloxane, 10 parts of acrylamide, 7 parts of tripropylene glycol diacrylate, 8 parts of isodecyl acrylate, 35 parts of butanone, 1.1 parts of azobisisobutyronitrile, 0.6 part of dodecanethiol, 3 parts of 2-methyl-1, 8-octanediol, 15 parts of polychlorotrifluoroethylene powder and 2 parts of diphenylmethane diisocyanate.
In this embodiment, in step B3, the preparation method of the high temperature resistant adhesive includes the following steps:
s1, weighing the following components in parts by weight: dimethyl acryloxyethyl polysiloxane, acrylamide, tripropylene glycol diacrylate, isodecyl acrylate, butanone, azobisisobutyronitrile, dodecanethiol, 2-methyl-1, 8-octanediol, polychlorotrifluoroethylene powder, and diphenylmethane diisocyanate;
s2, putting dimethyl acryloyloxyethyl polysiloxane, acrylamide, tripropylene glycol diacrylate, isodecyl acrylate and butanone into a reaction kettle, stirring, mixing, vacuumizing, dissolving to form a uniform solution, dissolving azobisisobutyronitrile and dodecanethiol with a small amount of butanone respectively, heating to 79 ℃, dissolving azobisisobutyronitrile and dodecanethiol with a small amount of butanone respectively, beginning to dropwise add azobisisobutyronitrile and dodecanethiol, keeping 79 ℃ after 40min dropwise addition is finished, continuing to react for 7h, and discharging to obtain a high-temperature-resistant adhesive semi-finished product solution;
s3, cooling the high-temperature-resistant adhesive semi-finished product solution to 50 ℃, adding polychlorotrifluoroethylene powder, stirring at a high speed of 2500rpm, and vacuumizing to uniformly suspend and disperse the polychlorotrifluoroethylene powder in the high-temperature-resistant adhesive semi-finished product solution; continuously stirring and adding 2-methyl-1, 8-octanediol, and uniformly mixing to obtain the high-temperature resistant adhesive; when in use, the diphenylmethane diisocyanate is added and mixed evenly.
In this example, in step B4, the rolling pressure for hot press compounding was 0.4 MPa.
In this embodiment, in step B5, the temperature for baking and curing is 75 ℃, and the baking time is 20 min.
Tests show that the 180-degree peeling force between the PU film and the PTFE composite film is 26.7N/25mm, and the adhesive force is 55.3N/25mm in the polyurethane and polytetrafluoroethylene composite film prepared by the polyurethane and polytetrafluoroethylene composite process of the embodiment; can be used for a long time in a high-temperature environment of 110-120 ℃.
Example 3:
a composite process of polyurethane and polytetrafluoroethylene comprises the following steps:
b1, weighing polyurethane, drying at 125 ℃ in vacuum until the water content is less than 50ug/g, feeding the polyurethane into a single-screw extruder for melting, and then preparing a PU film by injection molding;
b2, weighing polytetrafluoroethylene and polytrifluorochloroethylene, drying at 125 ℃ in vacuum until the water content is less than 50ug/g, then sending into a double-screw extruder for melting and mixing, and then preparing a PTFE composite membrane by injection molding;
b3, naturally cooling the PU film and the PTFE composite film to 55 ℃, and stretching and shaping; then respectively passing through glue spreader rollers to coat a high-temperature resistant adhesive on the composite bonding surface between the PU film and the PTFE composite film;
b4, carrying out hot-pressing compounding on the PU film and the PTFE composite film through a compounding roller to obtain a composite film of polyurethane and polytetrafluoroethylene;
and B5, feeding the composite film of polyurethane and polytetrafluoroethylene into an oven, baking and curing, naturally cooling, and discharging to complete the compounding of polyurethane and polytetrafluoroethylene.
In this embodiment, in step B2, the weighing of polytetrafluoroethylene and polychlorotrifluoroethylene is specifically weighing 96 parts by weight of polytetrafluoroethylene and 8 parts by weight of polychlorotrifluoroethylene.
In this embodiment, in step B3, the high temperature resistant adhesive is made from the following raw materials in parts by weight: 14 parts of dimethyl acryloyl oxyethyl polysiloxane, 13 parts of acrylamide, 10 parts of tripropylene glycol diacrylate, 12 parts of isodecyl acrylate, 40 parts of butanone, 1.5 parts of azobisisobutyronitrile, 0.8 part of dodecanethiol, 5 parts of 2-methyl-1, 8-octanediol, 20 parts of polychlorotrifluoroethylene powder and 3 parts of diphenylmethane diisocyanate.
In this embodiment, in step B3, the preparation method of the high temperature resistant adhesive includes the following steps:
s1, weighing the following components in parts by weight: dimethyl acryloxyethyl polysiloxane, acrylamide, tripropylene glycol diacrylate, isodecyl acrylate, butanone, azobisisobutyronitrile, dodecanethiol, 2-methyl-1, 8-octanediol, polychlorotrifluoroethylene powder, and diphenylmethane diisocyanate;
s2, putting dimethyl acryloyloxyethyl polysiloxane, acrylamide, tripropylene glycol diacrylate, isodecyl acrylate and butanone into a reaction kettle, stirring, mixing, vacuumizing, dissolving to form a uniform solution, dissolving azobisisobutyronitrile and dodecanethiol with a small amount of butanone respectively, heating to 81 ℃, dissolving azobisisobutyronitrile and dodecanethiol with a small amount of butanone respectively, beginning to dropwise add azobisisobutyronitrile and dodecanethiol, keeping the temperature at 81 ℃ after 30min dropwise addition is finished, continuing to react for 5h, and discharging to obtain a high-temperature-resistant adhesive semi-finished product solution;
s3, cooling the high-temperature resistant adhesive semi-finished product solution to 55 ℃, adding polychlorotrifluoroethylene powder, stirring at a high speed of 2000rpm and vacuumizing to uniformly suspend and disperse the polychlorotrifluoroethylene powder in the high-temperature resistant adhesive semi-finished product solution; continuously stirring and adding 2-methyl-1, 8-octanediol, and uniformly mixing to obtain the high-temperature resistant adhesive; when in use, the diphenylmethane diisocyanate is added and mixed evenly.
In this example, in step B4, the rolling pressure for hot press compounding was 0.5 MPa.
In this embodiment, in step B5, the temperature for baking and curing is 85 ℃, and the baking time is 15 min.
Tests show that the 180-degree peeling force between the PU film and the PTFE composite film is 27.8N/25mm, and the adhesive force is 57.2N/25mm in the polyurethane and polytetrafluoroethylene composite film prepared by the polyurethane and polytetrafluoroethylene composite process of the embodiment; can be used for a long time in a high-temperature environment of 110-120 ℃.
Example 4:
a composite process of polyurethane and polytetrafluoroethylene comprises the following steps:
b1, weighing polyurethane, drying at 122 ℃ in vacuum until the water content is less than 50ug/g, feeding the polyurethane into a single-screw extruder for melting, and then preparing a PU film by injection molding;
b2, weighing polytetrafluoroethylene and polytrifluorochloroethylene, drying at 122 ℃ in vacuum until the water content is less than 50ug/g, then sending into a double-screw extruder for melting and mixing, and then preparing a PTFE composite membrane by injection molding;
b3, naturally cooling the PU film and the PTFE composite film to 52 ℃, and stretching and shaping; then respectively passing through glue spreader rollers to coat a high-temperature resistant adhesive on the composite bonding surface between the PU film and the PTFE composite film;
b4, carrying out hot-pressing compounding on the PU film and the PTFE composite film through a compounding roller to obtain a composite film of polyurethane and polytetrafluoroethylene;
and B5, feeding the composite film of polyurethane and polytetrafluoroethylene into an oven, baking and curing, naturally cooling, and discharging to complete the compounding of polyurethane and polytetrafluoroethylene.
In this embodiment, in step B2, the weighing of polytetrafluoroethylene and polychlorotrifluoroethylene is specifically weighing 94 parts by weight of polytetrafluoroethylene and 6 parts by weight of polychlorotrifluoroethylene.
In this embodiment, in step B3, the high temperature resistant adhesive is made from the following raw materials in parts by weight: 13 parts of dimethyl acryloyl oxyethyl polysiloxane, 12.1 parts of acrylamide, 8.5 parts of tripropylene glycol diacrylate, 10.3 parts of isodecyl acrylate, 37 parts of butanone, 1.3 parts of azodiisobutyronitrile, 0.7 part of dodecanethiol, 4.2 parts of 2-methyl-1, 8-octanediol, 17.8 parts of polychlorotrifluoroethylene powder and 2.6 parts of diphenylmethane diisocyanate.
In this embodiment, in step B3, the preparation method of the high temperature resistant adhesive includes the following steps:
s1, weighing the following components in parts by weight: dimethyl acryloxyethyl polysiloxane, acrylamide, tripropylene glycol diacrylate, isodecyl acrylate, butanone, azobisisobutyronitrile, dodecanethiol, 2-methyl-1, 8-octanediol, polychlorotrifluoroethylene powder, and diphenylmethane diisocyanate;
s2, putting dimethyl acryloyloxyethyl polysiloxane, acrylamide, tripropylene glycol diacrylate, isodecyl acrylate and butanone into a reaction kettle, stirring, mixing, vacuumizing, dissolving to form a uniform solution, dissolving azobisisobutyronitrile and dodecanethiol with a small amount of butanone respectively, heating to 80 ℃, dissolving azobisisobutyronitrile and dodecanethiol with a small amount of butanone respectively, beginning to dropwise add azobisisobutyronitrile and dodecanethiol, keeping 80 ℃ after 35min dropwise addition is finished, continuing to react for 6h, and discharging to obtain a high-temperature-resistant adhesive semi-finished product solution;
s3, cooling the high-temperature-resistant adhesive semi-finished product solution to 52 ℃, adding polychlorotrifluoroethylene powder, stirring at a high speed of 2200rpm, and vacuumizing to uniformly suspend and disperse the polychlorotrifluoroethylene powder in the high-temperature-resistant adhesive semi-finished product solution; continuously stirring and adding 2-methyl-1, 8-octanediol, and uniformly mixing to obtain the high-temperature resistant adhesive; when in use, the diphenylmethane diisocyanate is added and mixed evenly.
In this example, in step B4, the rolling pressure for hot press compounding was 0.45 MPa.
In this embodiment, in step B5, the temperature for baking and curing is 80 ℃, and the baking time is 18 min.
Tests show that the 180-degree peeling force between the PU film and the PTFE composite film is 28.1N/25mm, and the adhesive force is 57.8N/25mm in the polyurethane and polytetrafluoroethylene composite film prepared by the polyurethane and polytetrafluoroethylene composite process in the embodiment; can be used for a long time in a high-temperature environment of 110-120 ℃.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (7)
1. A composite process of polyurethane and polytetrafluoroethylene is characterized by comprising the following steps:
b1, weighing polyurethane, drying at 120-125 ℃ in vacuum until the water content is less than 50ug/g, feeding into a single-screw extruder for melting, and then preparing a PU film by injection molding;
b2, weighing polytetrafluoroethylene and polytrifluorochloroethylene, drying at 120-125 ℃ in vacuum until the water content is less than 50ug/g, feeding into a double-screw extruder for melting and mixing, and then preparing a PTFE composite membrane by injection molding;
b3, naturally cooling the PU film and the PTFE composite film to 50-55 ℃, and stretching and shaping; then respectively passing through glue spreader rollers to coat a high-temperature resistant adhesive on the composite bonding surface between the PU film and the PTFE composite film;
b4, carrying out hot-pressing compounding on the PU film and the PTFE composite film through a compounding roller to obtain a composite film of polyurethane and polytetrafluoroethylene;
and B5, feeding the composite film of polyurethane and polytetrafluoroethylene into an oven, baking and curing, naturally cooling, and discharging to complete the compounding of polyurethane and polytetrafluoroethylene.
2. The process of claim 1, wherein in step B2, the polytetrafluoroethylene and the polychlorotrifluoroethylene are weighed, specifically, 92 to 96 parts by weight of polytetrafluoroethylene and 4 to 8 parts by weight of polychlorotrifluoroethylene are weighed.
3. The process of claim 1, wherein in step B3, the high temperature adhesive is prepared from the following raw materials in parts by weight: 12-14 parts of dimethyl acryloyl oxyethyl polysiloxane, 10-13 parts of acrylamide, 7-10 parts of tripropylene glycol diacrylate, 8-12 parts of isodecyl acrylate, 35-40 parts of butanone, 1.1-1.5 parts of azobisisobutyronitrile, 0.6-0.8 part of dodecyl mercaptan, 3-5 parts of 2-methyl-1, 8-octanediol, 15-20 parts of polychlorotrifluoroethylene powder and 2-3 parts of diphenylmethane diisocyanate.
4. The process of claim 1, wherein in step B3, the high temperature adhesive is prepared from the following raw materials in parts by weight: 13 parts of dimethyl acryloyl oxyethyl polysiloxane, 12.1 parts of acrylamide, 8.5 parts of tripropylene glycol diacrylate, 10.3 parts of isodecyl acrylate, 37 parts of butanone, 1.3 parts of azodiisobutyronitrile, 0.7 part of dodecanethiol, 4.2 parts of 2-methyl-1, 8-octanediol, 17.8 parts of polychlorotrifluoroethylene powder and 2.6 parts of diphenylmethane diisocyanate.
5. The process for compounding polyurethane and polytetrafluoroethylene according to any one of claims 2 or 3, wherein in step B3, said high temperature adhesive is prepared by a method comprising the following steps:
s1, weighing the following components in parts by weight: dimethyl acryloxyethyl polysiloxane, acrylamide, tripropylene glycol diacrylate, isodecyl acrylate, butanone, azobisisobutyronitrile, dodecanethiol, 2-methyl-1, 8-octanediol, polychlorotrifluoroethylene powder, and diphenylmethane diisocyanate;
s2, putting dimethyl acryloyloxyethyl polysiloxane, acrylamide, tripropylene glycol diacrylate, isodecyl acrylate and butanone into a reaction kettle, stirring, mixing, vacuumizing, dissolving to form a uniform solution, dissolving azobisisobutyronitrile and dodecanethiol with a small amount of butanone respectively, heating to 79-81 ℃, dissolving azobisisobutyronitrile and dodecanethiol with a small amount of butanone respectively, beginning to dropwise add azobisisobutyronitrile and dodecanethiol, keeping 79-81 ℃ after dropwise adding is completed within 30-40 min, continuing to react for 5-7 h, and discharging to obtain a high-temperature resistant adhesive semi-finished product solution;
s3, cooling the semi-finished product solution of the high-temperature resistant adhesive to 50-55 ℃, adding polychlorotrifluoroethylene powder, stirring at a high speed of 2000-2500 rpm, and vacuumizing to uniformly suspend and disperse the polychlorotrifluoroethylene powder in the semi-finished product solution of the high-temperature resistant adhesive; continuously stirring and adding 2-methyl-1, 8-octanediol, and uniformly mixing to obtain the high-temperature resistant adhesive; when in use, the diphenylmethane diisocyanate is added and mixed evenly.
6. The process of claim 1, wherein in step B4, the roller pressure for hot-pressing is 0.4-0.5 MPa.
7. The process of claim 1, wherein in step B5, the temperature for baking and curing is 75-85 ℃ and the baking time is 15-20 min.
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Denomination of invention: A composite process of polyurethane and polytetrafluoroethylene Effective date of registration: 20230824 Granted publication date: 20211102 Pledgee: Pinghu Rural Commercial Bank of Zhejiang, Limited by Share Ltd. Pledgor: Pinghu Fangsheng Leather Co.,Ltd. Registration number: Y2023980053662 |