CN116814057A - Halogen-free flame-retardant antibacterial polycarbonate and preparation process thereof - Google Patents
Halogen-free flame-retardant antibacterial polycarbonate and preparation process thereof Download PDFInfo
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- CN116814057A CN116814057A CN202310789215.5A CN202310789215A CN116814057A CN 116814057 A CN116814057 A CN 116814057A CN 202310789215 A CN202310789215 A CN 202310789215A CN 116814057 A CN116814057 A CN 116814057A
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- free flame
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- 239000004417 polycarbonate Substances 0.000 title claims abstract description 87
- 239000003063 flame retardant Substances 0.000 title claims abstract description 65
- 229920000515 polycarbonate Polymers 0.000 title claims abstract description 56
- 230000000844 anti-bacterial effect Effects 0.000 title claims abstract description 44
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 40
- 239000003242 anti bacterial agent Substances 0.000 claims abstract description 35
- 238000002156 mixing Methods 0.000 claims abstract description 33
- 229920005989 resin Polymers 0.000 claims abstract description 30
- 239000011347 resin Substances 0.000 claims abstract description 30
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 claims abstract description 28
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 6
- 239000003963 antioxidant agent Substances 0.000 claims description 12
- 230000003078 antioxidant effect Effects 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 239000000314 lubricant Substances 0.000 claims description 12
- 239000012745 toughening agent Substances 0.000 claims description 12
- 239000004431 polycarbonate resin Substances 0.000 claims description 9
- 229920005668 polycarbonate resin Polymers 0.000 claims description 9
- -1 polytetrafluoroethylene Polymers 0.000 claims description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 8
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 4
- 125000003118 aryl group Chemical group 0.000 claims description 4
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 claims description 3
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 claims description 3
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910001431 copper ion Inorganic materials 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- LVTHXRLARFLXNR-UHFFFAOYSA-M potassium;1,1,2,2,3,3,4,4,4-nonafluorobutane-1-sulfonate Chemical compound [K+].[O-]S(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F LVTHXRLARFLXNR-UHFFFAOYSA-M 0.000 claims description 3
- 125000001931 aliphatic group Chemical group 0.000 claims description 2
- 239000011787 zinc oxide Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 8
- HWXBQOWZWWYBLY-UHFFFAOYSA-N C1(=CC=CC=C1)S(=O)(=O)OS(=O)(=O)C=1C=CC=CC1.[K] Chemical compound C1(=CC=CC=C1)S(=O)(=O)OS(=O)(=O)C=1C=CC=CC1.[K] HWXBQOWZWWYBLY-UHFFFAOYSA-N 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 13
- 239000000155 melt Substances 0.000 abstract description 10
- 239000002245 particle Substances 0.000 abstract description 9
- 238000012360 testing method Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- TXQVDVNAKHFQPP-UHFFFAOYSA-N [3-hydroxy-2,2-bis(hydroxymethyl)propyl] octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(CO)(CO)CO TXQVDVNAKHFQPP-UHFFFAOYSA-N 0.000 description 3
- 230000000845 anti-microbial effect Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- KCSVLWWBFNKRRA-UHFFFAOYSA-N OS(C1=CC=CC=C1)(=O)=O.O=[S-](C1=CC=CC=C1)=O.[K+] Chemical group OS(C1=CC=CC=C1)(=O)=O.O=[S-](C1=CC=CC=C1)=O.[K+] KCSVLWWBFNKRRA-UHFFFAOYSA-N 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000004599 antimicrobial Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- MLWPJXZKQOPTKZ-UHFFFAOYSA-N benzenesulfonyl benzenesulfonate Chemical compound C=1C=CC=CC=1S(=O)(=O)OS(=O)(=O)C1=CC=CC=C1 MLWPJXZKQOPTKZ-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
-
- 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
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/22—Halogen free composition
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the field of modified polycarbonate, in particular to a preparation process of halogen-free flame-retardant antibacterial polycarbonate, which comprises the steps of uniformly mixing a part of PC resin, halogen-free flame retardant and other auxiliary agents to obtain a mixture A, uniformly mixing the other part of PC resin and antibacterial agent to obtain a mixture B, feeding the mixture A into a double-screw extruder for main feeding, feeding the mixture B into the double-screw extruder for side feeding for melt mixing, and extruding and granulating; the double-screw extruder is a homodromous parallel double-screw extruder, and the screw combination is sequentially divided into a feeding section, a plasticizing section, a mixing section, an exhaust section and a metering section. The existing preparation process of halogen-free flame-retardant antibacterial polycarbonate is optimized, so that materials are fully melted and homogenized in a mixing section, the temperature of a melt is reduced, and the problems of particle porosity, flame retardance, unqualified impact resistance and the like are solved.
Description
Technical Field
The invention relates to the field of modified polycarbonate, in particular to halogen-free flame-retardant antibacterial polycarbonate and a preparation process thereof.
Background
The polycarbonate material (PC material) is used as a thermoplastic engineering material, has the advantages of high transparency, outstanding impact resistance, creep resistance, heat resistance, difficult deformation and the like, and is widely applied to the fields of glass assembly, automobiles, electronics, electrical appliances, medical treatment, protective equipment and the like. To provide antimicrobial properties to polycarbonate materials, they are often achieved by incorporating an antimicrobial agent therein. The existing antibacterial agents are mainly divided into natural antibacterial agents, organic antibacterial agents and inorganic antibacterial agents, wherein the inorganic antibacterial agents such as silver antibacterial agents, zinc antibacterial agents, copper-containing antibacterial agents and the like are used as common auxiliary agents of halogen-free flame-retardant antibacterial polycarbonate materials due to good durability and heat resistance. However, because metal ions have better heat conduction performance, the halogen-free flame-retardant antibacterial polycarbonate material is easy to cause higher melt temperature in the preparation process, and when the melt temperature is too high, the polycarbonate is degraded, so that the problems of poor toughness and flame-retardant effect of a finished product, honeycomb holes of particles, high water absorption and the like are caused.
Disclosure of Invention
In order to solve the problem that polycarbonate is easy to decompose due to high melt temperature of the existing halogen-free flame-retardant antibacterial polycarbonate material, the invention provides a preparation process of the halogen-free flame-retardant antibacterial polycarbonate, which comprises the steps of uniformly mixing a part of PC resin, a halogen-free flame retardant and other auxiliary agents to obtain a mixture A, uniformly mixing the other part of PC resin and an antibacterial agent to obtain a mixture B, feeding the mixture A into a double-screw extruder for main feeding, feeding the mixture B into the double-screw extruder for side feeding for melt mixing, and extruding and granulating; the double-screw extruder is a homodromous parallel double-screw extruder, the screw combination is sequentially divided into a feeding section, a plasticizing section, a mixing section, an exhaust section and a metering section, wherein each section sequentially comprises the following threaded elements:
feeding section: 48/48A, 72/72, 72/36, 64/64, 48/48;
and (3) plasticizing: k45/5/64, K45/5/48, 64/64, K45/5/48, 48/48, 32/16L;
mixing section: 64/64, 64/64, FME48/48 64/64, FME48/48, 64/64, 48/48, 32/16L;
and (3) an exhaust section: 64/64, 64/64;
metering section: 48/48, 48/48.
Wherein 72/72 represents a conveying element having a pitch of 72mm and an element length of 72m, and the like;
48/48A represents a conveying element having a pitch of 48mm and an element length of 48mm, wherein "A" represents the element being the starting element of the screw;
32/16L represents a left-hand conveying element with a pitch of 32mm and an element length of 16 mm;
the "K" series indicates that the element is a shearing element, taking K45/5/64 as an example, "45" indicates the kneading disc rotation angle, "5" indicates that the shearing element comprises 5 kneading discs, "64" indicates that the shearing element has a total length of 64mm, and the like;
the "FME" series indicates that the element is a mixing element and FME48/48 indicates a mixing element having a pitch of 48mm and an element length of 48 mm.
The existing preparation process of the halogen-free flame-retardant antibacterial polycarbonate is optimized, PC resin and an antibacterial agent are adopted for pre-dispersing and uniformly mixing, and the dispersing distribution of the antibacterial agent in the polycarbonate is enhanced; the double-screw extruder with specific screw combination is used to make the materials fully melted and homogenized in the mixing section, so as to reduce the temperature of the melt, and solve the problems of porous particles, unqualified flame retardant property and impact resistance, etc.
Further, the halogen-free flame-retardant antibacterial polycarbonate comprises the following components in percentage by mass:
the term "93 to 98% of the PC resin" as used herein means the sum of the mass percentages of the "one part of the PC resin" and the "other part of the PC resin".
Further, the other auxiliary agents comprise 0.2% -0.6% of antioxidant, 0.2% -0.6% of lubricant, 1% -3.6% of toughening agent and 0.1% -0.7% of anti-dripping agent.
Further, uniformly mixing 80% -90% of PC resin, 0.1% -0.5% of halogen-free flame retardant, 0.2% -0.6% of antioxidant, 0.2% -0.6% of lubricant, 1% -3.6% of toughening agent and 0.1% -0.7% of anti-dripping agent to obtain a mixture A, uniformly mixing the rest PC resin and 0.4% -1% of antibacterial agent to obtain a mixture B, feeding the mixture A into the twin-screw extruder, feeding the mixture B into the twin-screw extruder, melting and mixing, extruding and granulating.
Preferably, 80% -90% of PC resin, 0.1% -0.5% of halogen-free flame retardant, 0.2% -0.6% of antioxidant, 0.2% -0.6% of lubricant, 1% -3.6% of toughening agent and 0.1% -0.7% of anti-dripping agent are stirred in a high-speed mixer at 200rpm for 120s to obtain a mixture A, the rest PC resin and 0.4% -1% of antibacterial agent are stirred in a powder grinding machine at 300rpm for 300s to obtain a mixture B, the mixture A is fed into the double-screw extruder for main feeding, the mixture B is fed into the double-screw extruder for side feeding for melt mixing, and extrusion granulation is carried out. It will be appreciated that the sum of PC resins in mix A and mix B is 93% to 98%.
Further, the length-diameter ratio of the screw is 40:1, and the total length of the screw is 1876mm.
Further, the temperature of the double-screw extruder is 180-220 ℃, and the screw rotating speed is 300-400rpm. Preferably, the temperature is 180-200℃and the screw speed is 400rpm.
Further, the PC resin is one or a combination of more of aliphatic polycarbonate resin, aromatic polycarbonate resin and aliphatic-aromatic polycarbonate resin.
Further, the halogen-free flame retardant is one or a combination of more of potassium perfluorobutyl sulfonate, 3-benzenesulfonyl benzene sulfonate and polytetrafluoroethylene.
Further, the antibacterial agent is one or a combination of more of silver ion antibacterial agent, copper ion antibacterial agent, zinc ion antibacterial agent and zinc oxide.
The invention also provides halogen-free flame-retardant antibacterial polycarbonate which is prepared according to the preparation process of the halogen-free flame-retardant antibacterial polycarbonate.
Compared with the prior art, the preparation process of the halogen-free flame-retardant antibacterial polycarbonate is beneficial to fully melting and homogenizing raw materials, reduces the melt temperature of the material and avoids high-temperature degradation of the polycarbonate, so that the prepared halogen-free flame-retardant antibacterial polycarbonate material has good flow property, mechanical property and flame retardant property.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Hereinafter, "%" means mass percent.
Example 1
The preparation process of the halogen-free flame-retardant antibacterial polycarbonate comprises the steps of stirring 85.7% of PC resin, 0.3% of halogen-free flame retardant, 0.4% of antioxidant, 0.6% of lubricant, 2% of toughening agent and 0.3% of anti-dripping agent in a high-speed mixer at 200rpm for 120s to obtain a mixture A, stirring 10% of PC resin and 0.7% of antibacterial agent in a powdering machine at 300rpm for 300s to obtain a mixture B, feeding the mixture A into a twin-screw extruder for main feeding, feeding the mixture B into the twin-screw extruder for side feeding for melt mixing, and extruding and granulating. Wherein the length-diameter ratio of the double-screw extruder is 40:1, the temperature of the screw cylinder is 180-200 ℃, the rotating speed of the main machine is 400rpm, and the capacity is 300kg/h.
Wherein the PC resin is aromatic polycarbonate resin; the halogen-free flame retardant is potassium perfluorobutyl sulfonate; the antioxidant is 1076 (beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate); the lubricant is PETS (pentaerythritol stearate); the toughening agent is MBS; the anti-dripping agent is PTFE polytetrafluoroethylene; the antibacterial agent is zinc ion antibacterial agent.
The double-screw extruder is a homodromous parallel double-screw extruder, the screw combination is sequentially divided into a feeding section, a plasticizing section, a mixing section, an exhaust section and a metering section, the total length of the screw is 1876mm, and each section sequentially comprises the following threaded elements:
feeding section: 48/48A, 72/72, 72/36, 64/64, 48/48;
and (3) plasticizing: k45/5/64, K45/5/48, 64/64, K45/5/48, 48/48, 32/16L;
mixing section: 64/64, 64/64, FME48/48 64/64, FME48/48, 64/64, 48/48, 32/16L;
and (3) an exhaust section: 64/64, 64/64;
metering section: 48/48, 48/48.
The prepared halogen-free flame-retardant antibacterial polycarbonate particles are internally nonporous.
Example 2
The preparation process of the halogen-free flame-retardant antibacterial polycarbonate comprises the steps of stirring 90% of PC resin, 0.5% of halogen-free flame retardant, 0.6% of antioxidant, 0.6% of lubricant, 3% of toughening agent and 0.5% of anti-dripping agent in a high-speed mixer at 200rpm for 120s to obtain a mixture A, stirring 3.8% of PC resin and 1% of antibacterial agent in a powder mill at 300rpm for 300s to obtain a mixture B, feeding the mixture A into a double-screw extruder for main feeding, feeding the mixture B into the double-screw extruder for side feeding for melt mixing, and extruding and granulating. Wherein the length-diameter ratio of the double-screw extruder is 40:1, the temperature of the screw cylinder is 180-220 ℃, the rotating speed of the main machine is 300rpm, and the capacity is 300kg/h.
Wherein the PC resin is aromatic polycarbonate resin; the halogen-free flame retardant is 3-benzenesulfonyl potassium benzenesulfonate; the antioxidant is 1076 (beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate); the lubricant is PETS (pentaerythritol stearate); the toughening agent is MBS; the anti-dripping agent is PTFE polytetrafluoroethylene; the antibacterial agent is silver ion antibacterial agent.
Twin screw extruder screw set contract example 1. The prepared halogen-free flame-retardant antibacterial polycarbonate particles are internally nonporous.
Example 3
The preparation process of the halogen-free flame-retardant antibacterial polycarbonate comprises the steps of stirring 80% of PC resin, 0.1% of halogen-free flame retardant, 0.3% of antioxidant, 0.3% of lubricant, 1% of toughening agent and 0.1% of anti-dripping agent in a high-speed mixer at 200rpm for 120s to obtain a mixture A, stirring 17.2% of PC resin and 1% of antibacterial agent in a powder mill at 300rpm for 300s to obtain a mixture B, feeding the mixture A into a double-screw extruder for main feeding, feeding the mixture B into the double-screw extruder for side feeding for melt mixing, and extruding and granulating. Wherein the length-diameter ratio of the double-screw extruder is 40:1, the temperature of the screw cylinder is 180-200 ℃, the rotating speed of the main machine is 350rpm, and the capacity is 300kg/h.
Wherein the PC resin is aliphatic-aromatic polycarbonate resin; the halogen-free flame retardant is 3-benzenesulfonyl potassium benzenesulfonate; the antioxidant is 1076 (beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate); the lubricant is PETS (pentaerythritol stearate); the toughening agent is MBS; the anti-dripping agent is PTFE polytetrafluoroethylene; the antibacterial agent is copper ion antibacterial agent.
Twin screw extruder screw set contract example 1. The prepared halogen-free flame-retardant antibacterial polycarbonate particles are internally nonporous.
Comparative example 1
95.7 percent of PC powder resin, 0.3 percent of halogen-free flame retardant, 0.4 percent of antioxidant, 0.6 percent of lubricant, 2 percent of toughening agent, 0.7 percent of antibacterial agent and 0.3 percent of anti-dripping agent are put into a high-speed mixer to be stirred for 120 seconds at 200rpm, so as to obtain a mixture, and the mixture is put into a double-screw extruder to be melted and mixed, extruded and granulated. Wherein the length-diameter ratio of the double-screw extruder is 40:1, the temperature of the screw cylinder is 180-200 ℃, the rotating speed of the main machine is 400rpm, and the capacity is 300kg/h. Twin screw extruder screw set contract example 1. The prepared halogen-free flame-retardant antibacterial polycarbonate particles are internally porous.
Comparative example 2
Unlike example 1, in the twin-screw extruder screw combination, the mixing section comprises the following flighted elements in sequence: 64/64, 64/64, K45/5/48 64/64, K45/5/48, 64/64, 48/48, 32/16L. Other conditions were the same as in example 1. The prepared halogen-free flame-retardant antibacterial polycarbonate particles still have a small number of holes inside.
According to the display of the panel of the extruder, the melt temperature of the halogen-free flame-retardant antibacterial polycarbonate in the embodiment 1 is 233 ℃, the melt temperature of the halogen-free flame-retardant antibacterial polycarbonate in the embodiment 1 is 273 ℃, and the melt temperature of the halogen-free flame-retardant antibacterial polycarbonate in the embodiment 2 is 258 ℃, so that the preparation process provided by the invention can effectively reduce the melt temperature of the halogen-free flame-retardant antibacterial polycarbonate, thereby preventing the polycarbonate from being degraded and affecting the product performance.
Preparing a halogen-free flame-retardant antibacterial polycarbonate mechanical property sample by using an injection molding machine, wherein the injection molding temperature is shown in the following table:
table 1 injection molding process conditions for halogen-free flame retardant antimicrobial polycarbonate samples
The halogen-free flame retardant and antibacterial polycarbonate materials prepared in example 1 and comparative examples 1-2 were subjected to the test of the related performance indexes under the same test conditions, and the test results are shown in the following table 2:
table 2 results of test for halogen-free flame retardant antimicrobial polycarbonate sample properties
The melt finger, namely the melt flow rate volume method, is tested according to the GB/T3682.1-2018 standard;
tensile strength is tested according to GB/T1040.1-2018 standard;
flexural strength and flexural modulus were tested according to GB/T9341-2008 standard;
notched impact performance was tested according to GB/T1043.1-2008 standard;
moisture was tested according to ASTM D6980-17;
the plastic combustion performance vertical method is tested according to the EC60695 and UL94 standards;
from the test results of table 2, it can be derived:
the halogen-free flame-retardant antibacterial polycarbonate material prepared by the preparation process of the halogen-free flame-retardant antibacterial polycarbonate provided by the embodiment of the invention has better performance in all aspects than that of the comparative example. Comparative example 1 differs from example 1 in that all the raw materials were mixed at once; comparative example 2 differs from example 1 in that melt blending, extrusion pelletization were performed using an existing twin screw extruder, and test results showed that: according to the embodiment of the invention, part of PC resin and an antibacterial agent are premixed and combined by a specific screw, so that raw materials are fully dispersed, the temperature of halogen-free flame-retardant antibacterial polycarbonate melt is reduced, the polycarbonate is prevented from being degraded, and the problems of porous particles, unqualified flame retardant property, unqualified impact resistance and the like are solved.
In addition, the main equipment and instruments used in the above examples are shown in Table 3
TABLE 3 Table 3
| Instrument name | Model number | Manufacturer' s |
| High-speed mixer | SHR200 | Suzhou Songyuan |
| Equidirectional parallel double-screw extruder | STS-50 | Nanjing Kebeilong |
| Pendulum impact testing machine | ZBC8400-C | Meitesi |
| Electronic universal testing machine | AGS-X-10KN | Shimadzu (Shimadzu) |
| Melt flow rate meter | MFI-2322S | Jin Jian |
| Injection molding machine | EM80-V | Sea-sky injection molding machine |
| Vertical burning tester for water products | AUTO-SPA | Aldrich wound |
| Powder beating machine | YE2-160M-6 | Shanghai Ling E motor |
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. A preparation process of halogen-free flame-retardant antibacterial polycarbonate is characterized by comprising the following steps of: uniformly mixing a part of PC resin, a halogen-free flame retardant and other auxiliary agents to obtain a mixture A, uniformly mixing another part of PC resin and an antibacterial agent to obtain a mixture B, putting the mixture A into a double-screw extruder for feeding, putting the mixture B into the double-screw extruder for melting and mixing, extruding and granulating; the double-screw extruder is a homodromous parallel double-screw extruder, the screw combination is sequentially divided into a feeding section, a plasticizing section, a mixing section, an exhaust section and a metering section, wherein each section sequentially comprises the following threaded elements:
feeding section: 48/48A, 72/72, 72/36, 64/64, 48/48;
and (3) plasticizing: k45/5/64, K45/5/48, 64/64, K45/5/48, 48/48, 32/16L;
mixing section: 64/64, 64/64, FME48/48 64/64, FME48/48, 64/64, 48/48, 32/16L;
and (3) an exhaust section: 64/64, 64/64;
metering section: 48/48, 48/48.
2. The process for preparing halogen-free flame retardant and antibacterial polycarbonate according to claim 1, which is characterized in that: the halogen-free flame-retardant antibacterial polycarbonate comprises the following components in percentage by mass:
3. the process for preparing halogen-free flame retardant and antibacterial polycarbonate according to claim 2, which is characterized in that: the other auxiliary agents comprise 0.2% -0.6% of antioxidant, 0.2% -0.6% of lubricant, 1% -3.6% of toughening agent and 0.1% -0.7% of anti-dripping agent.
4. The process for preparing halogen-free flame retardant and antibacterial polycarbonate according to claim 3, wherein the process comprises the following steps: mixing 80% -90% of PC resin, 0.1% -0.5% of halogen-free flame retardant, 0.2% -0.6% of antioxidant, 0.2% -0.6% of lubricant, 1% -3.6% of toughening agent and 0.1% -0.7% of anti-dripping agent uniformly to obtain a mixture A, mixing the rest PC resin and 0.4% -1% of antibacterial agent uniformly to obtain a mixture B, putting the mixture A into a main feed of a double-screw extruder, putting the mixture B into a side feed of the double-screw extruder for melt mixing, and extruding and granulating.
5. The process for preparing halogen-free flame retardant and antibacterial polycarbonate according to claim 1, which is characterized in that: the length-diameter ratio of the screw is 40:1, and the total length of the screw is 1876mm.
6. The process for preparing halogen-free flame retardant and antibacterial polycarbonate according to claim 1, which is characterized in that: the temperature of the double-screw extruder is 180-220 ℃, and the screw rotating speed is 300-400rpm.
7. The process for preparing halogen-free flame retardant and antibacterial polycarbonate according to claim 1, which is characterized in that: the PC resin is one or a combination of more of aliphatic polycarbonate resin, aromatic polycarbonate resin and aliphatic-aromatic polycarbonate resin.
8. The process for preparing halogen-free flame retardant and antibacterial polycarbonate according to claim 1, which is characterized in that: the halogen-free flame retardant is one or a combination of more of potassium perfluorobutyl sulfonate, potassium 3-benzenesulfonyl benzenesulfonate and polytetrafluoroethylene.
9. The process for preparing halogen-free flame retardant and antibacterial polycarbonate according to claim 1, which is characterized in that: the antibacterial agent is one or a combination of more of silver ion antibacterial agent, copper ion antibacterial agent, zinc ion antibacterial agent and zinc oxide.
10. A halogen-free flame retardant antibacterial polycarbonate prepared according to the preparation process of the halogen-free flame retardant antibacterial polycarbonate of any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310789215.5A CN116814057A (en) | 2023-06-30 | 2023-06-30 | Halogen-free flame-retardant antibacterial polycarbonate and preparation process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310789215.5A CN116814057A (en) | 2023-06-30 | 2023-06-30 | Halogen-free flame-retardant antibacterial polycarbonate and preparation process thereof |
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| CN116814057A true CN116814057A (en) | 2023-09-29 |
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| CN202310789215.5A Pending CN116814057A (en) | 2023-06-30 | 2023-06-30 | Halogen-free flame-retardant antibacterial polycarbonate and preparation process thereof |
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