CN111733474A - Full-biodegradable dental floss and preparation method thereof - Google Patents
Full-biodegradable dental floss and preparation method thereof Download PDFInfo
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- CN111733474A CN111733474A CN202010415634.9A CN202010415634A CN111733474A CN 111733474 A CN111733474 A CN 111733474A CN 202010415634 A CN202010415634 A CN 202010415634A CN 111733474 A CN111733474 A CN 111733474A
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- dental floss
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- polylactic acid
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- 241000628997 Flos Species 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000004626 polylactic acid Substances 0.000 claims abstract description 48
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 45
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 239000003242 anti bacterial agent Substances 0.000 claims abstract description 20
- 239000002667 nucleating agent Substances 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000012745 toughening agent Substances 0.000 claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 12
- 238000002074 melt spinning Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 238000001035 drying Methods 0.000 claims abstract description 3
- 238000005303 weighing Methods 0.000 claims abstract description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 14
- 239000000155 melt Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 239000004599 antimicrobial Substances 0.000 claims description 8
- -1 polybutylene adipate terephthalate Polymers 0.000 claims description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 229920000379 polypropylene carbonate Polymers 0.000 claims description 5
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 claims description 4
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 claims description 4
- 229910001431 copper ion Inorganic materials 0.000 claims description 4
- 239000005014 poly(hydroxyalkanoate) Substances 0.000 claims description 4
- 229920001610 polycaprolactone Polymers 0.000 claims description 4
- 239000004632 polycaprolactone Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000004629 polybutylene adipate terephthalate Substances 0.000 claims description 3
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 229920000578 graft copolymer Polymers 0.000 claims description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 2
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 239000000454 talc Substances 0.000 claims 1
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- 229920003023 plastic Polymers 0.000 description 16
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- 239000002994 raw material Substances 0.000 description 14
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- 229920000642 polymer Polymers 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000000855 fermentation Methods 0.000 description 4
- 230000004151 fermentation Effects 0.000 description 4
- 238000009987 spinning Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000002028 Biomass Substances 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 229920002261 Corn starch Polymers 0.000 description 2
- 208000034530 PLAA-associated neurodevelopmental disease Diseases 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- LOUPRKONTZGTKE-WZBLMQSHSA-N Quinine Chemical compound C([C@H]([C@H](C1)C=C)C2)C[N@@]1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OC)C=C21 LOUPRKONTZGTKE-WZBLMQSHSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000000844 anti-bacterial effect Effects 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
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- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000005543 nano-size silicon particle Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000004631 polybutylene succinate Substances 0.000 description 2
- 229920002961 polybutylene succinate Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000903 polyhydroxyalkanoate Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010902 straw Substances 0.000 description 2
- 230000007847 structural defect Effects 0.000 description 2
- JQYSLXZRCMVWSR-UHFFFAOYSA-N 1,6-dioxacyclododecane-7,12-dione;terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1.O=C1CCCCC(=O)OCCCCO1 JQYSLXZRCMVWSR-UHFFFAOYSA-N 0.000 description 1
- 235000001258 Cinchona calisaya Nutrition 0.000 description 1
- 229920001634 Copolyester Polymers 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
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- 229920002472 Starch Polymers 0.000 description 1
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- LOUPRKONTZGTKE-UHFFFAOYSA-N cinchonine Natural products C1C(C(C2)C=C)CCN2C1C(O)C1=CC=NC2=CC=C(OC)C=C21 LOUPRKONTZGTKE-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229920006238 degradable plastic Polymers 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229960000948 quinine Drugs 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
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- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- 238000009864 tensile test Methods 0.000 description 1
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Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C15/00—Devices for cleaning between the teeth
- A61C15/04—Dental floss; Floss holders
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
- D01F1/103—Agents inhibiting growth of microorganisms
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Dentistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Artificial Filaments (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The present disclosure provides a fully biodegradable dental floss and a preparation method thereof, comprising: respectively weighing polylactic acid, a toughening agent, a nucleating agent and an antibacterial agent, and putting into mixing equipment for uniformly mixing; putting the mixture into a double-screw extruder for melt blending, and extruding and granulating to obtain the special material for the fully biodegradable dental floss; drying, putting into melt spinning equipment, cooling, drawing, and curling to obtain primary fiber, and hot stretching the primary fiber to obtain high-strength dental floss.
Description
Technical Field
The disclosure relates to the technical field of oral care, in particular to a fully biodegradable dental floss and a preparation method thereof.
Background
In the 21 st century, energy and environmental issues have become the focus of worldwide concern, and with the increasing energy crisis and environmental pollution, biodegradable plastics (biogradeable polymers) have gradually become a trend of research and a hot spot for commercial production. On one hand, the biodegradable plastic raw material is derived from renewable biomass, so that the dependence of the plastic industry on non-renewable energy sources such as petroleum, coal, natural gas and the like can be greatly reduced; and secondly, the biodegradable plastic can be degraded into carbon dioxide and water which can be absorbed by organisms in nature after being used, so that energy circulation is realized, and the environmental pollution caused by fossil energy is obviously reduced, thereby fundamentally eliminating environmental crises such as white pollution and marine micro-plastic pollution. At present, the attention degree of China on the problems of environment pollution and the like of high polymer plastics is obviously improved, and the realization of complete alternative energy is the key for solving the problems. In a word, the biodegradable plastic can play double effects of saving energy and protecting environment, and is a key field of research and development at home and abroad in recent years.
Biodegradable plastics generally refer to polymers that are degraded by the action of microorganisms in nature, but in recent years, polymers that are degradable in water (seawater, river water) have also been found. In general, biodegradable plastics refer to plastics that are degraded in nature by chemical, physical or biological action of microorganisms or water
Biodegradable plastics can be roughly classified into two types according to their raw material sources: one is biodegradable plastic derived from biomass plastic or biomass fermentation, such as starch, cellulose, lignin, Polylactic acid (PLA), Polyhydroxyalkanoates (PHAs); the other is derived from fossil energy, but can be completely biodegraded after use, such as polybutylene succinate (PBS), polybutylene terephthalate-adipate-butylene (PBAT), copolyester thereof and the like. However, with the development of modern industrial technologies, a part of acid or alcohol can be obtained by biological fermentation, so that the monomer derived from petroleum-based plastics is partially replaced to become biodegradable plastics.
Polylactic acid (PLA), also known as polylactide, is a polyester polymerized from lactic acid as a raw material, and is a completely biodegradable green plastic. The polylactic acid has good biocompatibility and degradability, has the performance of petroleum-based general plastics such as Polyethylene (PE), polypropylene (PP), Polystyrene (PS) and the like compared with the traditional plastics, has high modulus, high strength and controllable processing temperature, can be subjected to processes such as injection molding, extrusion, spinning and the like to prepare products such as films, sheets, fibers and the like, is applied to a plurality of fields such as clothing, packaging, automobiles, electronics, biological medicine and the like, and is the most deeply developed and remarkably applied biodegradable plastic at present.
Compared with the traditional petrochemical products, the energy consumption in the production process of the polylactic acid is only 20-50 percent of that of the petrochemical products, and the generated carbon dioxide is only 50 percent of that of the petrochemical products. Therefore, the development of polylactic acid degradable plastics is very necessary for the relief of global environmental and energy problems.
Disclosure of Invention
In order to solve the problem of white pollution caused by common plastic dental floss, the dental floss is prepared by adopting biodegradable plastic, mainly taking polylactic acid (PLA) as a raw material, adding auxiliary agents such as a toughening agent, an antibacterial agent, a nucleating agent and the like, and preparing the polylactic acid dental floss by a melt spinning process. PLA is a biodegradable polymer prepared from corn starch, straw, etc. as raw materials through a series of processes such as fermentation and polymerization, and has been used in many industries and fields. PLA has good spinnability, can be prepared into fiber plastics with different lengths, and is suitable for being used as dental floss.
The present disclosure aims to provide a novel fully biodegradable dental floss, first, polylactic acid has complete biodegradability, is environmentally friendly; secondly, the antibacterial agent is added, so that the shelf life of the dental floss is prolonged, and the dental floss keeps clean and sanitary.
The present disclosure provides a fully biodegradable plastic comprising:
(1) polylactic acid with the mass content of 70-95%;
(2) the mass content of the toughening agent is 5-30%;
(3) 0.1-1% of nucleating agent by mass;
(4) 0-1% of antibacterial agent.
In a preferred embodiment, the fully biodegradable plastic comprises:
(1) 80-90% of polylactic acid;
(2) the mass content of the toughening agent is 10-20%;
(3) 0.1 to 0.5 percent of nucleating agent by mass;
(4) 0.1-0.5% of antibacterial agent.
In a preferred embodiment, the polylactic acid has a melt index of 10 to 25g/10 min. When the melt index of the polylactic acid is too high, for example, more than 25g/10min, insufficient fiber strength may result; when the melt index is too low, for example, less than 10g/10min, difficulty in fiber formation may be caused.
In a preferred embodiment, the polylactic acid has a glass transition temperature of 55 to 63 ℃. in a preferred embodiment, the polylactic acid has a weight average molecular weight Mw of 1 × 105To 3 × 105Preferably, the polylactic acid has a weight average molecular weight Mw of 1 × 105To 2 × 105The physical properties of the polylactic acid are influenced by the molecular weight, the polylactic acid has stable properties and is more suitable for being used as a substrate plastic when the weight average molecular weight Mw of the polylactic acid is less than 1 × 105In the case of g/mol, the fiber strength may be too low.
Preferably, the polylactic acid is at least one of dextrorotatory polylactic acid, levorotatory polylactic acid, racemic polylactic acid and a mixture thereof. In the above technical solutions, the choice of polylactic acid is selected by those skilled in the art according to the actual situation, and is not limited to the range listed above.
In a preferred embodiment, the toughening agent is selected from one or more of polybutylene adipate terephthalate (PBAT), Polycaprolactone (PCL), Polyhydroxyalkanoate (PHA), polypropylene carbonate (PPC), acrylate copolymers, maleic anhydride graft copolymers, but is not limited thereto.
Poly (butylene adipate terephthalate) (PBAT) is mainly used for improving the toughness of polylactic acid, and commercially available products such as those manufactured by BASF corporation can be used.
In a preferred embodiment, the nucleating agent is selected from one or more of nano calcium carbonate, nano talcum powder, nano silicon dioxide and nano titanium dioxide, but is not limited thereto.
The addition of the nucleating agent accelerates the crystallization process, increases the crystallization temperature and can improve the processing performance. In addition, under the condition that the optimal dosage is 1%, the addition of the nucleating agent can improve the interfacial bonding force of the PLA/PBAT blend, and the tensile property is enhanced. Excessive amounts of nucleating agent result in a decrease in PLA/PBAT tensile strength, elongation at break, and thermal stability. Therefore, the composite material with excellent performance can be obtained by controlling the adding proportion.
In a preferred embodiment, the antimicrobial agent is selected from one or more of a silver ion antimicrobial agent, a zinc ion antimicrobial agent, a copper ion antimicrobial agent, but is not limited thereto.
The present disclosure also provides a preparation method of the full biodegradable plastic, comprising the following steps:
(1) respectively weighing polylactic acid, a toughening agent, a nucleating agent and an antibacterial agent according to a certain proportion, and putting into mixing equipment for uniform mixing to obtain a blend;
(2) putting the blend obtained in the step (1) into a double-screw extruder for melt blending, and extruding and granulating to obtain the special material for the fully biodegradable dental floss;
(3) drying the special material for the fully biodegradable dental floss obtained in the step (2), putting the material into melt spinning equipment, spraying melt trickle from a porous spinneret plate, cooling, drawing and curling to obtain primary fiber filaments, and then carrying out hot stretching on the primary fiber filaments to obtain the high-strength dental floss.
In a preferred embodiment, the PLA and PBAT are dried in a vacuum oven at 60 ℃ for 12h before said melt blending.
In a preferred embodiment, the melt blending temperature is 165-185 ℃.
In a preferred embodiment, the melt blending may be carried out at a feed rate of 180-220rpm, typically 200 rpm.
Most polymers are incompatible and are subject to dynamics that can significantly vary in morphology, for example: viscosity of the polymer, mixing ratio, mixing conditions (shear rate, shear temperature, etc.), interfacial properties, etc. Different kinetic conditions may result in different morphologies and properties. Therefore, the blending conditions should be strictly controlled according to the blend performance during blending, the PLA blending mode is generally selected to be melt blending, the melt blending can be selected to be twin-screw blending and internal mixer blending, the blending temperature, the length of the screw, the rotating speed, the blending time, the shearing rate of the internal mixer and the like are all key factors influencing the blend morphology, and therefore, the processing conditions should be strictly controlled during processing.
The disclosure also provides a fully biodegradable dental floss prepared by the preparation method of the fully biodegradable plastic.
In order to solve the problem of white pollution caused by common plastic dental floss, the dental floss is prepared by adopting biodegradable plastic, mainly taking polylactic acid (PLA) as a raw material, adding auxiliary agents such as a toughening agent, an antibacterial agent, a nucleating agent and the like, and preparing the polylactic acid dental floss by a melt spinning process. PLA is a biodegradable polymer prepared from corn starch, straw, etc. as raw materials through a series of processes such as fermentation and polymerization, and has been used in many industries and fields. PLA has good spinnability, can be prepared into fiber plastics with different lengths, and is suitable for being used as dental floss.
Wherein, the addition amount of the toughening agent is 5-30%, the toughening agent has the function of improving the toughness of the PLA, and when the amount of the toughening agent is less than 5%, the PLA has larger brittleness, and the spinning process or the dental floss is easy to break; when the amount of the toughening agent is more than 30%, the tensile strength of the dental floss is poor, and the dental floss is easy to stretch and deform.
Wherein, the addition amount of the nucleating agent is 0.1-1%, the effects of the nucleating agent are that the crystallization speed is accelerated, the alloy processing performance is improved, and the alloy processing process is not smooth when the amount of the nucleating agent is less than 0.1%; when the amount of the nucleating agent is more than 1%, it causes structural defects, thereby affecting the continuity of the spinning process.
Wherein, the addition amount of the antibacterial agent is 0-1%, the function of the antibacterial agent is bacteriostasis and mildew prevention, and when no antibacterial agent exists, the dental floss does not have the bacteriostasis and mildew prevention effects; when the amount of the antibacterial agent is more than 1%, it causes structural defects, thereby affecting the continuity of the spinning process.
The beneficial effect of this disclosure does: firstly, polylactic acid has complete biodegradability and is environment-friendly; secondly, the antibacterial agent is added, so that the shelf life of the dental floss is prolonged, and the dental floss keeps clean and sanitary; and thirdly, the mechanical property is excellent, the whiteness is high, the environment is friendly, and the preparation is simple.
The preparation method of the full-biodegradable plastic can be realized through the conventional equipment, namely a double-screw extruder, and has the advantages of easy implementation, strong operability, easy industrial large-scale production, good economic benefit and wide application prospect.
Detailed Description
The present disclosure is described in further detail below with reference to specific embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail with reference to embodiments.
Examples
The following disclosed embodiments illustrate the present disclosure in more detail, however, the present disclosure is not limited to only these embodiments.
Example 1
According to the proportion of 90 parts of PLA, 9 parts of PBAT, 0.5 part of nano calcium carbonate and 0.5 part of silver ion antibacterial agent, the raw materials are blended, the special material for the biodegradable dental floss is prepared by a double-screw extruder, the melt extrusion temperature is 190 ℃, and then the dental floss is prepared by a melt spinning process.
Example 2
According to the proportion of 90 parts of PLA, 9 parts of PPC, 0.5 part of nano-silicon dioxide and 0.5 part of silver ion antibacterial agent, the raw materials are blended, the special material for the biodegradable dental floss is prepared by a double-screw extruder, the melt extrusion temperature is 190 ℃, and then the dental floss is prepared by a melt spinning process.
Example 3
According to the proportion of 85 parts of PLA, 14 parts of PBAT, 0.5 part of nano calcium carbonate and 0.5 part of copper ion antibacterial agent, the raw materials are blended, the special material for the biodegradable dental floss is prepared by a double-screw extruder, the melt extrusion temperature is 190 ℃, and then the dental floss is prepared by a melt spinning process.
Example 4
According to the proportion of 70 parts of PLA, 29 parts of PBAT, 0.5 part of nano calcium carbonate and 0.5 part of copper ion antibacterial agent, the raw materials are blended, the special material for the biodegradable dental floss is prepared by a double-screw extruder, the melt extrusion temperature is 190 ℃, and then the dental floss is prepared by a melt spinning process.
Comparative example 1
The raw materials are blended according to the proportion of 90 parts of PLA, 9.5 parts of PBAT and 0.5 part of nano calcium carbonate, the special material for the biodegradable dental floss is prepared by a double-screw extruder, the melt extrusion temperature is 190 ℃, and then the dental floss is prepared by a melt spinning process.
Comparative example 2
Blending the raw materials according to the proportion of PLA85 parts and PBAT15 parts, melting and extruding the mixture into strips through a double-screw extruder, wherein the strips of the blended material are different in thickness and easy to break.
Comparative example 3
The raw materials are blended according to the proportion of PLA90 parts, PBAT7 parts and nano calcium carbonate 3 parts, the special material for the biodegradable dental floss is prepared by melt extrusion through a double-screw extruder, and then the phenomenon of filament breakage occurs in the process of drawing through a melt spinning process, so that the continuous production is influenced.
Sample detection
Samples obtained in examples 1 to 4 and comparative example 1 were taken
And (3) tensile test: instron-5699 tester was used, following the standard GB/T1040-92 Plastic tensile Property test method; the evaluation of the antibacterial effect was carried out by the quinine method.
The tensile bars had dimensions of 25mm × 4mm × 2mm and were injection-molded using a Scientific MiNiJet Pro apparatus at an injection temperature of 190 ℃ and an injection pressure of 700 bar.
TABLE 1 sample Performance test results
We can see from the above table that examples 1-4 can increase the elongation at break of PLA and increase the ductility of the material by adding different amounts of toughening agent. By contrast, comparative examples 1-3 have relatively low elongation at break. And in the comparative example 2, no nucleating agent is added, and the strands of the blend are different in thickness and easy to break. In the comparative example 3, the content of the nucleating agent is too high, and the wire breaking phenomenon occurs in the wire drawing process, so that the continuous production is influenced. Meanwhile, the antibacterial agent is added to play a good antibacterial effect, so that the dental floss is more favorable for being used as dental floss.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, plastics, or characteristics described may be combined in any suitable manner in any one or more of the embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (10)
1. A fully biodegradable dental floss, comprising:
(1) polylactic acid with the mass content of 70-95%;
(2) the mass content of the toughening agent is 5-30%;
(3) 0.1-1% of nucleating agent by mass;
(4) 0-1% of antibacterial agent.
2. The fully biodegradable dental floss of claim 1, comprising:
(1) 80-90% of polylactic acid;
(2) the mass content of the toughening agent is 10-20%;
(3) 0.1 to 0.5 percent of nucleating agent by mass;
(4) 0.1-0.5% of antibacterial agent.
3. The fully biodegradable dental floss according to claim 1 or 2, wherein the polylactic acid has a melt index of 10-25g/10 min.
4. Fully biodegradable dental floss according to claim 1 or 2, wherein the polylactic acid has a weight average molecular weight Mw of 1 × 105To 3 × 105g/mol。
5. The fully biodegradable dental floss according to claim 1 or 2, wherein the toughening agent is selected from one or more of polybutylene adipate terephthalate (PBAT), Polycaprolactone (PCL), Polyhydroxyalkanoate (PHA), polypropylene carbonate (PPC), acrylate copolymers, maleic anhydride graft copolymers.
6. The fully biodegradable dental floss according to claim 1 or 2, wherein the nucleating agent is selected from one or more of nano calcium carbonate, nano talc, nano silica, nano titanium dioxide.
7. The fully biodegradable dental floss according to claim 1 or 2, wherein the antimicrobial agent is selected from one or more of silver ion antimicrobial agent, zinc ion antimicrobial agent, copper ion antimicrobial agent.
8. A method of preparing a fully biodegradable dental floss according to claim 1 or 2, comprising the steps of:
(1) respectively weighing polylactic acid, a toughening agent, a nucleating agent and an antibacterial agent according to a certain proportion, and putting into mixing equipment for uniform mixing to obtain a blend;
(2) putting the blend obtained in the step (1) into a double-screw extruder for melt blending, and extruding and granulating to obtain the special material for the fully biodegradable dental floss;
(3) drying the special material for the fully biodegradable dental floss obtained in the step (2), putting the material into melt spinning equipment, spraying melt trickle from a porous spinneret plate, cooling, drawing and curling to obtain primary fiber filaments, and then carrying out hot stretching on the primary fiber filaments to obtain the high-strength dental floss.
9. The method as claimed in claim 8, wherein the temperature of the melt blending is 165-185 ℃.
10. The process for preparing a fully biodegradable dental floss according to claim 8, wherein the melt blending can be carried out at a feed rate of 180-220rpm, preferably 200 rpm.
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| CN113861647A (en) * | 2021-10-29 | 2021-12-31 | 盐城工学院 | Full-biodegradable dental floss |
| CN114451608A (en) * | 2022-03-25 | 2022-05-10 | 无锡市锡山人民医院 | Antibacterial degradable polylactic acid protective clothing |
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| CN114921072A (en) * | 2022-04-22 | 2022-08-19 | 湖北正宇环保材料科技有限公司 | Antibacterial degradable injection molding material special for oral care products and preparation method thereof |
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