CN115093689A - Low-creep and stable-size PC film production process - Google Patents
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Abstract
The invention relates to the technical field of PC films, and discloses a production process of a low-creep and stable-size PC film, which comprises the following raw materials in parts by weight: 100-200 parts of PC resin, 50-70 parts of cycloolefin copolymer, 5-10 parts of compatilizer, 7-13 parts of chain extender, 5-7 parts of toluene, 1-3 parts of nucleating agent, 10-30 parts of filler, 3-5 parts of toughening agent and 3-5 parts of dispersant. According to the production process of the low-creep and stable-size PC film, when the PC resin is produced, a large number of benzene ring structures are crosslinked on a linear chain or a branched chain of polypropylene in the stirring process to form a large number of gap structures, and after the filler is added, the gap structures are filled in gaps by the filler, and meanwhile, the graphene with electronegativity is adsorbed with the polypropylene, so that the graphene is inserted into the surface of the polypropylene to generate conductivity; the sodium polyacrylate modified polypropylene fiber has the advantages that the linear chain structure of the sodium polyacrylate is guaranteed, various additive components are stably introduced, and the oxidation resistance, heat resistance, flame retardance, strength, antistatic performance and creep resistance of the PP fiber are effectively improved.
Description
Technical Field
The invention relates to the technical field of PC films, in particular to a production process of a PC film with low creep and stable size.
Background
The PC film is a polycarbonate film for short, and is an amorphous, odorless, nontoxic, highly transparent colorless or yellowish thermoplastic engineering plastic.
At present, when a traditional PC film is produced, PC resin and a processing aid are usually added into a double-screw base machine to form a film, but the PC film produced by the method has the advantages of stable heat resistance and size and poor creep deformation resistance, and cannot meet the requirements of materials in the field with higher heat resistance requirements such as heat-releasing electric appliances, so that a low-creep and stable-size PC film production process is provided, and the problems are solved.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a production process of a PC film with low creep deformation and stable size, and solves the problems that the heat resistance and the size stability of the material are poor, the creep deformation resistance is generally poor, and the requirements of the fields with higher heat resistance requirements, such as materials of heat-releasing electrical appliances and the like, cannot be met.
(II) technical scheme
The invention provides the following technical scheme: a production process of a low-creep and dimensionally stable PC film comprises the following raw materials in parts by weight: 100-200 parts of PC resin, 50-70 parts of cycloolefin copolymer, 5-10 parts of compatilizer, 7-13 parts of chain extender, 5-7 parts of toluene, 1-3 parts of nucleating agent, 10-30 parts of filler, 3-5 parts of flexibilizer and 3-5 parts of dispersant.
Preferably, the main chain of the cycloolefin copolymer is a cycloolefin, and the grafting monomer is one of maleic anhydride, maleic ester monomers, fumaric acid, fumaric ester monomers, acrylic acid, acrylate monomers, methacrylic acid, or methacrylate monomers.
Preferably, the compatilizer is prepared from maleic anhydride grafted polyphenyl ether and maleic anhydride grafted polyethylene according to a mass ratio of (1-3): (2-4).
Preferably, the cycloolefin copolymer is one or more of ethylene-norbornene copolymer (COC), styrene-norbornene Copolymer (COP), COC derivative, and COP derivative.
Preferably, the dispersant is modified ethylene bis fatty acid amide, and the nucleating agent is a beta-nucleating agent.
Preferably, the filler is a mixture of nano titanium dioxide, nano silicon dioxide and graphite, the mixing ratio of the nano titanium dioxide to the nano silicon dioxide to the graphite is 1.7:2:1,
a low creep, dimensionally stable PC film production process comprising the steps of:
s1, preparing the materials;
s2, adding the PC resin, the toluene and the filler into a stirrer, stirring at the speed of 800-1000r/min, introducing nitrogen to 0.5MPa, heating to 200 ℃ at the speed of 20 ℃/min, and then stirring at constant temperature for 60-80min to form a mixture A;
s3, adding mixture a into the hopper of an extruder, the temperature of the extruder being 1 stage: 170 ℃ and 180 ℃, 2 sections: 180 ℃ and 190 ℃ and 3 sections: 190 plus temperature to 200 ℃, starting an extruder after reaching the plasticizing temperature, wherein the speed of the extruder is 45-50RP, and extruding and stretching to obtain a mixture B.
S4, adding the cyclic olefin copolymer, the chain extender and the nucleating agent into a reaction kettle, mixing, and stirring at the rotation speed of 1200r/min for 40-60min to obtain a mixture C;
s5, adding the mixture C into a double-screw extruder to obtain a mixture D.
S6, placing the mixture D and the mixture B into a UV illumination box for illumination for 15-20 seconds;
s7, adding the mixture B, the mixture D and the rest materials after illumination into a double-screw granulator, extruding, granulating and drying to obtain slices;
and S8, melting and extruding the slices, cooling, and performing longitudinal stretching, transverse stretching and sizing after cooling to obtain the PC film with low creep and stable size.
(III) advantageous effects
Compared with the prior art, the invention provides a production process of a PC film with low creep and stable size, which has the following beneficial effects:
1. the low-creep and stable-size PC film production process can synthesize the advantageous properties of various unit graft copolymers, realize complementation among all components, make up the defect of single performance of the unit graft copolymers, and achieve the effect that one is added and one is larger than two.
2. According to the production process of the PC film with low creep and stable size, the compound is prepared by melting and mixing the graft copolymers with various units through a screw melting, mixing and extruding process, so that the advantages and properties of the graft copolymers with various units can be integrated, and the functional complementation among the graft copolymers with various units can be realized. The method has simple process, can solve the problem of single performance of the existing unit graft copolymer, and can also avoid the problems of high control difficulty and high crosslinking risk of the grafting process in the process of multi-graft copolymerization.
3. According to the production process of the low-creep and stable-size PC film, the cyclic olefin copolymer mainly refers to a copolymer of norbornene and other olefins, a large number of norbornene chain segments exist on a macromolecular chain, the rotation of the molecular chain is difficult due to the huge steric hindrance effect of the norbornene chain segments, and then higher glass transition temperature and good rigidity are reflected, and meanwhile, the macromolecular chain segments are difficult to move and show lower creep property due to the fact that the rotation of the molecular chain segments is difficult
4. According to the production process of the low-creep and stable-size PC film, when the PP resin is produced, a large number of benzene ring structures are crosslinked on a linear chain or a branched chain of polypropylene in the stirring process to form a large number of gap structures, and after the filler is added, the gap structures are filled in gaps by the filler, and meanwhile, graphene with electronegativity is adsorbed with the polypropylene, so that the graphene is inserted into the surface of the polypropylene to generate conductivity; the sodium polyacrylate fiber has the advantages that the linear chain structure of the sodium polyacrylate is guaranteed, various addition components are stably introduced, and the oxidation resistance, heat resistance, flame retardance, strength, antistatic property and creep resistance of the PP fiber are effectively improved.
5. According to the production process of the low-creep and stable-size PC film, the nucleating agent is a beta-nucleating agent, a large number of beta-crystal forms are generated in the material, a large number of extended chain segments formed by connecting continuous molecular chains exist in a porous crystallization area of the beta-crystal forms, clear boundaries do not exist between spherulites, and a large number of silver streaks can be initiated and more energy can be absorbed when the PC film is stretched or impacted by external force. Meanwhile, the mutual interference of stress fields among the silver streaks enables the stress to be dispersed, so that the further development of cracks is prevented, the low-temperature impact performance of the material is improved, the modified ethylene bis fatty acid amide is used as a dispersing agent, a polar group of the dispersing agent and the long chain end of a silane coupling agent generate strong attraction through Van der Waals, the attraction is enough to enable the interface of two phases to disappear, so that one phase is formed, the phase has certain intermiscibility with polypropylene, the effect of a phase intermiscibility agent is achieved, the external force stretching or impact on a beta-crystal form can be increased, the interference of the silver streak stress fields is further promoted, the mechanical performance of the product is improved, and the creep resistance of the product is improved.
6. According to the production process of the PC film with low creep and stable size, the compatilizer is arranged, so that the polyphenyl ether and the PC resin are well compatible in any proportion, the polyethylene and the cycloolefin copolymer are high in compatibility, the high heat resistance of the polyphenyl ether can make up for the defect of insufficient heat resistance of the polyethylene, and the high reactivity of the maleic anhydride can well improve the compatibility of the cycloolefin copolymer and the PC system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: a production process of a low-creep and dimensionally stable PC film comprises the following raw materials in parts by weight: 100 parts of PC resin, 50 parts of cycloolefin copolymer, 5 parts of compatilizer, 7 parts of chain extender, 5 parts of toluene, 1 part of nucleating agent, 10 parts of filler, 3 parts of flexibilizer and 3 parts of dispersant.
Further, the main chain of the cycloolefin copolymer is a cycloolefin, and the grafting monomer is one of maleic anhydride, maleic ester monomers, fumaric acid, fumaric ester monomers, acrylic acid, acrylate monomers, methacrylic acid, or methacrylate monomers.
Further, the compatilizer is prepared by mixing maleic anhydride grafted polyphenyl ether and maleic anhydride grafted polyethylene according to a mass ratio of 1: 2.
Further, the cycloolefin copolymer is one or more of ethylene-norbornene copolymer (COC), styrene-norbornene Copolymer (COP), COC derivatives and COP derivatives.
Further, the dispersant is modified ethylene bis fatty acid amide, and the nucleating agent is a beta-nucleating agent.
Further, the filler is a mixture of nano titanium dioxide, nano silicon dioxide and graphite, the mixing ratio of the nano titanium dioxide to the nano silicon dioxide to the graphite is 1.7:2:1,
a low creep, dimensionally stable PC film production process comprising the steps of:
s1, preparing the materials;
s2, adding the PC resin, the toluene and the filler into a stirrer, stirring at the speed of 800r/min, introducing nitrogen to 0.5MPa, heating to 200 ℃ at the speed of 20 ℃/min, and then stirring at constant temperature for 60min to form a mixture A;
s3, adding mixture a into the hopper of an extruder, the temperature of the extruder being 1 stage: 170 ℃ and 2 stages: 180 ℃ and 3 stages: and (3) starting an extruder after the temperature reaches 190 ℃ and reaches the plasticizing temperature, wherein the speed of the extruder is 45RP, and extruding and stretching to obtain a mixture B.
S4, adding the cyclic olefin copolymer, the chain extender and the nucleating agent into a reaction kettle, mixing, and stirring at the rotation speed of 1200r/min for 40min to obtain a mixture C;
s5, adding the mixture C into a double-screw extruder to obtain a mixture D.
S6, placing the mixture D and the mixture B into a UV illumination box for illumination, wherein the illumination time is 15 seconds;
s7, adding the illuminated mixture B, the illuminated mixture D and the rest materials into a double-screw granulator, extruding, granulating and drying to obtain slices;
and S8, melting and extruding the slices, cooling, and performing longitudinal stretching, transverse stretching and sizing after cooling to obtain the PC film with low creep deformation and stable size.
Example two:
a production process of a low-creep and dimensionally stable PC film comprises the following raw materials in parts by weight: 150 parts of PC resin, 60 parts of cycloolefin copolymer, 8 parts of compatilizer, 10 parts of chain extender, 6 parts of toluene, 2 parts of nucleating agent, 20 parts of filler, 4 parts of toughening agent and 4 parts of dispersant.
Further, the main chain of the cycloolefin copolymer is a cycloolefin, and the grafting monomer is one of maleic anhydride, maleic ester monomers, fumaric acid, fumaric ester monomers, acrylic acid, acrylate monomers, methacrylic acid, or methacrylate monomers.
Further, the compatilizer is prepared by mixing maleic anhydride grafted polyphenyl ether and maleic anhydride grafted polyethylene according to a mass ratio of 2: 3, and (3).
Further, the cycloolefin copolymer is one or more of ethylene-norbornene copolymer (COC), styrene-norbornene Copolymer (COP), COC derivatives and COP derivatives.
Further, the dispersing agent is modified ethylene bis fatty acid amide, and the nucleating agent is a beta-nucleating agent.
Further, the filler is a mixture of nano titanium dioxide, nano silicon dioxide and graphite, the mixing ratio of the nano titanium dioxide to the nano silicon dioxide to the graphite is 1.7:2:1,
a low creep, dimensionally stable PC film production process comprising the steps of:
s1, preparing the materials;
s2, adding the PC resin, the toluene and the filler into a stirrer, stirring at the speed of 900r/min, introducing nitrogen to 0.5MPa, heating to 200 ℃ at the speed of 20 ℃/min, and then stirring at constant temperature for 70min to form a mixture A;
s3, adding mixture a into the hopper of an extruder, the temperature of the extruder being 1 stage: 175 ℃, 2 stages: 185 ℃ and 3 stages: and (3) starting an extruder after reaching the plasticizing temperature of 195 ℃, wherein the speed of the extruder is 47RP, and extruding and stretching to obtain a mixture B.
S4, adding the cyclic olefin copolymer, the chain extender and the nucleating agent into a reaction kettle, mixing, and stirring for 50min at the rotating speed of 1200r/min to obtain a mixture C;
s5, adding the mixture C into a double-screw extruder to obtain a mixture D.
S6, placing the mixture D and the mixture B into a UV illumination box for illumination for 18 seconds;
s7, adding the illuminated mixture B, the illuminated mixture D and the rest materials into a double-screw granulator, extruding, granulating and drying to obtain slices;
and S8, melting and extruding the slices, cooling, and performing longitudinal stretching, transverse stretching and sizing after cooling to obtain the PC film with low creep and stable size.
Example three: a production process of a low-creep and dimensionally stable PC film comprises the following raw materials in parts by weight: 200 parts of PC resin, 70 parts of cycloolefin copolymer, 10 parts of compatilizer, 13 parts of chain extender, 7 parts of toluene, 3 parts of nucleating agent, 30 parts of filler, 5 parts of toughening agent and 5 parts of dispersant.
Further, the main chain of the cycloolefin copolymer is a cycloolefin, and the grafting monomer is one of maleic anhydride, maleic ester monomers, fumaric acid, fumaric ester monomers, acrylic acid, acrylate monomers, methacrylic acid, or methacrylate monomers.
Further, the compatilizer is prepared by mixing maleic anhydride grafted polyphenyl ether and maleic anhydride grafted polyethylene according to a mass ratio of 3: 4.
Further, the cycloolefin copolymer is one or more of ethylene-norbornene copolymer (COC), styrene-norbornene Copolymer (COP), COC derivatives and COP derivatives.
Further, the dispersing agent is modified ethylene bis fatty acid amide, and the nucleating agent is a beta-nucleating agent.
Further, the filler is a mixture of nano titanium dioxide, nano silicon dioxide and graphite, the mixing ratio of the nano titanium dioxide to the nano silicon dioxide to the graphite is 1.7:2:1,
a low creep, dimensionally stable PC film production process comprising the steps of:
s1, preparing the materials;
s2, adding the PC resin, the toluene and the filler into a stirrer, stirring at the speed of 1000r/min, introducing nitrogen to 0.5MPa, heating to 200 ℃ at the speed of 20 ℃/min, and then stirring at constant temperature for 80min to form a mixture A;
s3, adding mixture a into the hopper of an extruder, the temperature of the extruder being 1 stage: 180 ℃ and 2 stages: 190 ℃ and 3 stages: and (3) starting an extruder after the temperature reaches 200 ℃ and reaching the plasticizing temperature, wherein the speed of the extruder is 50RP, and extruding and stretching to obtain a mixture B.
S4, adding the cyclic olefin copolymer, the chain extender and the nucleating agent into a reaction kettle, mixing, and stirring for 60min at the rotating speed of 1200r/min to obtain a mixture C;
s5, adding the mixture C into a double-screw extruder to obtain a mixture D.
S6, placing the mixture D and the mixture B into a UV illumination box for illumination for 15-20 seconds;
s7, adding the mixture B, the mixture D and the rest materials after illumination into a double-screw granulator, extruding, granulating and drying to obtain slices;
s8, melting and extruding the slices, cooling, longitudinally stretching, transversely stretching and shaping after cooling to obtain the PC film with low creep and stable size
In summary, the low-creep and dimensionally stable PC film production process 1 provides a graft copolymer composite that can integrate the advantageous properties of a plurality of unit graft copolymers, complement each other, make up for the defect of single performance of the unit graft copolymer, and achieve the effect of one plus one over two.
2. According to the production process of the PC film with low creep and stable size, the compound is prepared by melting and mixing the graft copolymers with various units through a screw melting, mixing and extruding process, so that the advantages and properties of the graft copolymers with various units can be integrated, and the functional complementation among the graft copolymers with various units can be realized. The method has simple process, can solve the problem of single performance of the existing unit graft copolymer, and can also avoid the problems of high control difficulty and high crosslinking risk of the grafting process in the process of multi-graft copolymerization.
3. In the production process of the low-creep and stable-size PC film, the cycloolefin copolymer mainly refers to a copolymer of norbornene and other olefins, a large amount of norbornene chain segments exist on a macromolecular chain, the rotation of the molecular chain is difficult due to the huge steric hindrance effect of the norbornene chain segments, and then higher glass transition temperature and good rigidity are reflected, and meanwhile, the macromolecular chain segments are difficult to move and show lower creep property due to the difficult rotation of the molecular chain segments,
4. according to the production process of the low-creep and stable-size PC film, when the PP resin is produced, a large number of benzene ring structures are crosslinked on a linear chain or a branched chain of polypropylene in the stirring process to form a large number of gap structures, and then the filler is added, so that the gap structures are filled in gaps of the filler, and simultaneously, graphene with electronegativity is adsorbed with the polypropylene, so that the graphene is inserted into the surface of the polypropylene, and the conductivity is generated; the sodium polyacrylate fiber has the advantages that the linear chain structure of the sodium polyacrylate is guaranteed, various addition components are stably introduced, and the oxidation resistance, heat resistance, flame retardance, strength, antistatic property and creep resistance of the PP fiber are effectively improved.
5. According to the production process of the low-creep and stable-size PC film, the nucleating agent is a beta-nucleating agent, a large number of beta-crystal forms are generated in the material, a large number of extended chain segments formed by connecting continuous molecular chains exist in a porous crystallization area of the beta-crystal forms, clear boundaries do not exist between spherulites, and a large number of silver streaks can be initiated and more energy can be absorbed when the PC film is stretched or impacted by external force. Meanwhile, the mutual interference of stress fields among the silver stripes enables the stress to be dispersed, so that the further development of cracks is prevented, the low-temperature impact performance of the material is improved, the modified ethylene bis-fatty acid amide is used as a dispersing agent, a polar group of the dispersing agent and the long chain end of a silane coupling agent generate strong attraction through Van der Waals, the attraction is enough to enable the interface of two phases to disappear, so that one phase is formed, the phase has certain intermiscibility with polypropylene, the function of a phase dissolving agent is realized, the external force stretching or impact on a beta-crystal form can be increased, the interference of the stress fields of the silver stripes is further promoted, the mechanical performance of the product is improved, and the creep resistance of the product is improved.
6. Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, and it is intended that the scope of the present invention be limited by the appended claims and their equivalents.
Claims (7)
1. A production process of a low-creep and dimensionally stable PC film is characterized by comprising the following raw materials in parts by weight: 100-200 parts of PC resin, 50-70 parts of cycloolefin copolymer, 5-10 parts of compatilizer, 7-13 parts of chain extender, 5-7 parts of toluene, 1-3 parts of nucleating agent, 10-30 parts of filler, 3-5 parts of toughening agent and 3-5 parts of dispersant.
2. The process of claim 1, wherein the cyclic olefin copolymer backbone is a cyclic olefin, and the grafting monomer is one of maleic anhydride, maleic ester monomer, fumaric acid, fumaric ester monomer, acrylic acid, acrylic ester monomer, methacrylic acid, or methacrylic ester monomer.
3. The process for producing a low-creep dimensionally stable PC film according to claim 1, wherein the compatibilizer is prepared by mixing maleic anhydride-grafted polyphenylene ether and maleic anhydride-grafted polyethylene in a mass ratio of (1-3): (2-4).
4. The process of claim 1, wherein the cycloolefin copolymer is one or more of ethylene-norbornene copolymer (COC), styrene-norbornene Copolymer (COP), COC derivatives, and COP derivatives.
5. The process of claim 1, wherein the dispersant is a modified ethylene bis fatty acid amide and the nucleating agent is a β -nucleating agent.
6. The process of claim 1, wherein the filler is a mixture of nano titanium dioxide, nano silica and graphite in a ratio of 1.7:2: 1.
7. The process of claim 1, comprising the steps of:
s1, preparing the materials;
s2, adding PC resin, toluene and filler into a stirrer, stirring at the speed of 800-1000r/min, introducing nitrogen to 0.5MPa, heating to 200 ℃ at the speed of 20 ℃/min, and then stirring at constant temperature for 60-80min to form a mixture A;
s3, adding mixture a into the hopper of an extruder, the temperature of the extruder being 1 stage: 170 ℃ and 180 ℃, 2 sections: 180 ℃ and 190 ℃ and 3 sections: 190 ℃ and 200 ℃, starting an extruder after the plasticizing temperature is reached, wherein the speed of the extruder is 45-50RP, and performing extrusion and stretching to obtain a mixture B.
S4, adding the cyclic olefin copolymer, the chain extender and the nucleating agent into a reaction kettle, mixing, and stirring at the rotation speed of 1200r/min for 40-60min to obtain a mixture C;
s5, adding the mixture C into a double-screw extruder to obtain a mixture D.
S6, placing the mixture D and the mixture B into a UV illumination box for illumination for 15-20 seconds;
s7, adding the mixture B, the mixture D and the rest materials after illumination into a double-screw granulator, extruding, granulating and drying to obtain slices;
and S8, melting and extruding the slices, cooling, and performing longitudinal stretching, transverse stretching and sizing after cooling to obtain the PC film with low creep and stable size.
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| CN116082582A (en) * | 2022-09-30 | 2023-05-09 | 安捷利（番禺）电子实业有限公司 | Modified plastic and low-dielectric pure adhesive film prepared from same |
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