CN102241878A - Biodegradable toughening polylactic acid plastic and preparation method thereof - Google Patents
Biodegradable toughening polylactic acid plastic and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/875—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling for achieving a non-uniform temperature distribution, e.g. using barrels having both cooling and heating zones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/9259—Angular velocity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle zone
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Abstract
The invention relates to the field of plastic, and discloses a biodegradable toughening polylactic acid plastic and a preparation method thereof. The biodegradable toughening polylactic acid plastic comprises components of polylactic acid resin and copolymers thereof, polybutylene adipate resin, tributyl citrate and barium sulfate and surfactant thereof. The invention aims to provide a biodegradable toughening polylactic acid plastic and a preparation method thereof, so as to overcome a problem of difficultly degraded general-purpose plastic products and a defect of weak shock resistance of polylactic acid, raise comprehensive properties of polylactic acid, and provide a preparation method of a toughening polylactic acid plastic.
Description
Technical field
The present invention relates to the plastics field, relate in particular to a kind of biodegradable toughened polylactic plastics and preparation method thereof.
Background technology
Along with the development of plastic industry, the utilization of plastic prod more and more widely, but meanwhile, the plastic refuse that plastic prod produces also constantly increases, and the detrimentally affect of environment is tending towards serious.Traditional plastic refuse treatment process mainly is to reclaim, bury, burn, and these treatment process efficient are low, energy consumption is big, and can produce a large amount of toxic gases when burning, and causes second environmental pollution easily.Occupy the protection to environment, people have proposed the research and the preparation of biodegradable plastic.
The effect of the biodegradable plastic microorganism that to be a class existed by nature such as bacterium, fungi or algae and cause the plastics of degraded.It has good use properties, can be decomposed fully by environmental microorganism after discarding, and is finally entered the Carbon cycle of occurring in nature by inorganicization, thereby greatly reduces the pollution that plastic garbage brings to ecotope.Therefore, the exploitation biodegradable plastic has very big prospect.
Biodegradable plastic can be divided into two kinds of complete biodegradable plastics and destructive biodegradable plastics again.Complete biodegradable plastics mainly is to be made through microbial fermentation or synthetic polymer with biological degradability by natural polymer (as starch, Mierocrystalline cellulose, chitin) or agricultural byproducts, all belongs to this class plastics as thermoplastic starch plastic, aliphatic polyester, poly(lactic acid), starch/polyvinyl alcohol etc.; Current starch conversion (or filling) polythene PE, polypropylene PP, polyvinylchloride, the polystyrene PS etc. of mainly comprising of destructive biodegradable plastic.
Wherein, poly(lactic acid) is also referred to as polylactide, belongs to polyester family.Poly(lactic acid) is to be raw material with biomass starch, through the biodegradable polymer of hi-tech preparation.Poly(lactic acid) has excellent biological degradability, can be degraded fully by the microorganism in the soil in two years after discarding, and generates carbonic acid gas and water, and environment is not produced pollution.Poly(lactic acid) has the favorable mechanical processing characteristics, can be competent at the purposes of most of synthetic plastics.Poly(lactic acid) is the polymkeric substance that obtains for the main raw material polymerization with lactic acid, and raw material sources fully and can regenerate.The production process of poly(lactic acid) is pollution-free, and product can biological degradation, is implemented in the circulation of occurring in nature, is the ideal green macromolecular material therefore.Poly(lactic acid) has favorable mechanical performance and biological degradability because of it, and is often applied in the biodegradable plastic.Though poly(lactic acid) has above good characteristic, application also is subjected to certain restriction as general-purpose plastics with it, and this mainly is that shock resistance is poor because poly(lactic acid) is crisp.In order to overcome the above-mentioned shortcoming of poly(lactic acid), poly(lactic acid) is carried out toughening modifying, thereby the machinability of improving it seems very important.
In addition, hexanodioic acid can also be used to prepare softening agent and lubricant as the raw material of synthetic high polymer.Tributyl citrate is applicable to the softening agent of polyvinyl chloride, chlorination alkene copolymer, celluosic resin.Consistency is good, the plasticizing efficiency height; Cold-resistant, fast light, have excellent water-resistance; Little, the little poison of volatility, mould resistance is arranged.The plastic plasticizer that also can be used as food product pack and health care goods, toy for children.The volatility of tributyl citrate is little, and is good with the consistency of resin, the plasticization effect height.
Summary of the invention
The purpose of this invention is to provide a kind of biodegradable toughened polylactic plastics and preparation method thereof, overcome the problem of present general-purpose plastics goods difficult degradation; Overcome the defective of poly(lactic acid) shock resistance difference, improve its over-all properties; The production technique of toughened polylactic plastics is proposed.
To achieve these goals, technical scheme of the present invention is:
A kind of biodegradable toughened polylactic plastics are grouped into by following one-tenth: polylactic resin and multipolymer thereof, poly adipate succinic acid ester resin, tributyl citrate, barium sulfate and tensio-active agent.
Alternatively, described biodegradable toughened polylactic plastics comprise following composition and parts by weight:
00 part of polylactic resin and copolymer 1 thereof
5～50 parts of poly adipate succinic acid ester resins
10～20 parts of tributyl citrates
20～40 parts in barium sulfate
0.2～0.4 part in tensio-active agent.
Alternatively, described biodegradable toughened polylactic plastics also comprise the auxiliary agent of 0.5～1.0 parts by weight.
Alternatively, the molecular weight of described polylactic resin and multipolymer thereof is 5～300,000.
Alternatively, the molecular weight of described poly adipate succinic acid ester resin is 10～300,000.
Alternatively, the fineness of described barium sulfate is greater than 4000 orders.
Alternatively, described tensio-active agent is a polyether surfactant.
Preferably, described polyether surfactant is: one or more among polyethers L31, polyethers L61 and the polyethers L64.
Preferably, described auxiliary agent is selected from least a in dispersion agent, tinting material or the lubricant.
Preferably, described dispersion agent is a stearic amide.
Preferably, described tinting material is natural plant dye, diamino heterocyclic.
Preferably, described lubricant is a glycerol.
A kind of preparation method of biodegradable toughened polylactic plastics may further comprise the steps:
(1) in drying plant, respectively resin and barium sulfate are carried out drying;
(2) the various starting material that will prepare by a certain percentage at normal temperatures are stirred in stirring mixer and mix;
(3) mixed starting material are put into twin screw extruder and carry out extruding pelletization.
Preferably, the extrusion condition of described step (3) is:
In twin screw extruder, feeding section temperature is 100～140 ℃, and the compression section temperature is 140～160 ℃, and the metering zone temperature is 150～180 ℃, and the head temperature of twin screw extruder is 170～180 ℃; Screw speed is 95～160r/min.
Therefore, compared with prior art, use technical scheme of the present invention, following beneficial effect is arranged: biodegradable toughened polylactic plastics of the present invention are grouped into by following one-tenth: polylactic resin and multipolymer thereof, poly adipate succinic acid ester resin, tributyl citrate, barium sulfate and tensio-active agent, wherein polylactic resin and copolymer comprised thereof the overwhelming majority, make that these plastics can complete biodegradable;
Poly adipate succinic acid ester resin, tributyl citrate that certain content is arranged in the composition of plastics, the plasticization effect height of the two, so that the toughness of these plastics increases, improved the toughness of original poly(lactic acid); The molecular weight of polylactic resin and multipolymer thereof, poly adipate succinic acid ester resin and multipolymer thereof is all greater than 10
3, belong to high molecular polymer, can improve the physical strength of material; Barium sulfate is as weighting agent, and fineness can be mixed with other component in the material more than 4000 orders better;
Also contain auxiliary agent in the composition of plastics, the frictional force between the material internal molecule is reduced, improve the thermally-stabilised efficient of material.
Therefore, biodegradable toughened polylactic plastics of the present invention are a kind of environmentally friendly macromolecular materials, have improved the toughness of original poly(lactic acid), have improved the over-all properties of poly(lactic acid) plastics effectively, thereby make it have the prospect of using widely.
The preparation method of biodegradable gain of heat poly(lactic acid) plastics of the present invention adopts the disposable technology of finishing of twin-screw mixer reaction extruding pelletization, and this preparation method's technology is simple, easy to operate, high efficiency.
Embodiment
Describe the present invention in detail below in conjunction with specific embodiment, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as a limitation of the invention.
The advantage of poly(lactic acid) mainly contains following several respects:
(1) poly(lactic acid) is a kind of novel biodegradable material, and the starch material that uses reproducible plant resources (as corn) to be proposed is made.Starch material is made lactic acid via fermenting process, converts poly(lactic acid) to by chemosynthesis again.It has good biodegradability, can be degraded fully by the occurring in nature microorganism after the use, finally generates carbonic acid gas and water, and is free from environmental pollution, and this is highly beneficial to the protection environment, is the environment-friendly material of generally acknowledging.The treatment process of common plastics still is to burn to cremate, cause a large amount of greenhouse gases to enter in the air, the poly(lactic acid) plastics then are to be buried in the soil to degrade, and the carbonic acid gas of generation directly enters the soil organism or by plant absorbing, can not enter in the air, can not cause Greenhouse effect.
(2) mechanical property and physicals are good.Poly(lactic acid) is applicable to various working methods such as blowing, thermoplastic, easy to process, use very extensive, can be used for processing to civilian various plastics, wrap food, fast food lunch-box, non-woven fabrics, industry and civilian cloth from industry, and then being processed into geotextile, health care fabric, rag, sanitary product, outdoor antiultraviolet fabric, tent cloth, ground cushion face or the like, market outlook are very good.
(3) consistency and degradability are good.Poly(lactic acid) is used also very extensive at field of medicaments, as producing the disposable infusion apparatus, exempting to tear open type operating sutures etc., low molecular weight pdlla is done medicament slow release packing agent etc.
(4) poly(lactic acid) also possesses unique characteristic is arranged except the basic characteristic that biodegradable plastic is arranged.The intensity of traditional biological degradable plastics, transparency and to the resistivity of climate change neither as plastics, and poly(lactic acid) is quite different.
(5) basic physical properties of poly(lactic acid) and petrochemical industry synthetic plastics is similar, that is to say, it can be used for making various application products widely.Poly(lactic acid) also has good glossiness and transparency and utilizes the made film of polystyrene suitable, is that other biodegradable product can't provide.
(6) poly(lactic acid) has the best tensile strength and extensibility, poly(lactic acid) also can be produced by various common process modes, for example: fusing extrusion moulding, ejection formation, blowfilm shaping, foaming and vacuum forming, with present extensive employed polymkeric substance similar molding condition is arranged, it also has the printing performance identical with conventional films in addition.So, poly(lactic acid) just can be answered the demand of variant industry, makes application product miscellaneous.
(7) polylactic acid film has air permeability and good, oxygen-permeable and saturating carbonic acid gas, and it also has the characteristic of isolating smell.Virus and mould easily are attached to the surface of biodegradable plastic, thus the doubt of safety and health is arranged, however poly(lactic acid) is unique biodegradable plastic with good antibacterial and anti-mildew characteristic.
(8) when incinerating poly(lactic acid), its combustion heat value is identical with the incineration stationery, be half of incineration conventional plastic (as polyethylene), and the incineration poly(lactic acid) can never discharge toxic gases such as nitride, sulfide.Human body also contains the lactic acid that exists with morphon, and this has just represented the security that this decomposability product has.
Barium sulfate has another name called barite, and stable in properties is insoluble in water, acid, alkali or organic solvent.Medical treatment aspect, radiological examination are used the barium sulfate agent mainly to utilize it can absorb X ray in gi tract and made its development effect, and be therefore main as gastrointestinal tract contrast medium; Industrial, barium sulfate can be used as the raw material of paint, printing ink, plastics, rubber and store battery or weighting agent etc.; In glasswork, be used as finings, can play froth breaking and increase the glossy effect; Also can be used as the protection walls material that anti-radioactive rays are used; Also can be used for industries such as pottery, enamel, spices and pigment.In addition, barium sulfate is still made the raw material of other barium salts.
When preparing biodegradable toughened polylactic plastics, take by weighing raw material, again raw material carried out pre-treatment by the composition of composition and content, be stirred to full and uniform mixing after, through melt extruding granulation.
Dual-screw-stem machine generally is divided into following components: feed system, reduction box, main motor, screw rod, machine barrel, heating system, pumped vacuum systems, cooling system, interlock control system and electrical apparatus control system.Wherein, in the temperature control section of heating system, be divided into sections such as intake zone, a district, two districts, three districts, four districts again.
Embodiment 1:
(1) composition and content are formed: 100 parts of polylactic resin, 10 parts of poly adipate succinic acid ester resins, 10 parts of tributyl citrates, 20 parts in barium sulfate (5000 order), polyethers L610.2 part, 0.3 part of auxiliary agent glycerol.Above material usage by weight.
(2) pre-treatment of raw material: polylactic resin and poly adipate succinic acid ester resin are put in the loft drier, and temperature is 80 ℃, and dry 4h, barium sulfate are 110 ℃, dry 3h; The various starting material that prepare are stirred 3min in the stirring mixer high speed, and stirring at low speed is to mixing.
(3) extruding pelletization: the temperature of each section in the dual-screw-stem machine temperature control section: one section temperature is 110 ℃, two sections temperature are 130 ℃, three sections temperature are 145 ℃, four sections temperature are 155 ℃, five sections temperature are 160 ℃, six sections temperature are 150 ℃, and seven sections temperature are 165 ℃, and the head temperature of dual-screw-stem machine is 170 ℃; Screw speed: 100r/min.
Embodiment 2:
(1) composition and content are formed: 100 parts of polylactic resin, 40 parts of poly adipate succinic acid ester resins, 20 parts of tributyl citrates, 40 parts in barium sulfate (5000 order), polyethers L610.4 part, 0.4 part of auxiliary agent glycerol.Above material usage by weight.
(2) pre-treatment of raw material: polylactic resin and poly adipate succinic acid ester resin are put in the loft drier, and temperature is 80 ℃, and dry 4h, barium sulfate are 110 ℃, dry 3h; The various starting material that prepare are stirred 3min in the stirring mixer high speed, and stirring at low speed is to mixing.
(3) extruding pelletization: the temperature of each section in the dual-screw-stem machine temperature control section: one section temperature is 110 ℃, two sections temperature are 130 ℃, three sections temperature are 150 ℃, four sections temperature are 160 ℃, five sections temperature are 160 ℃, six sections temperature are 150 ℃, and seven sections temperature are 170 ℃, and the head temperature of dual-screw-stem machine is 175 ℃; Screw speed: 110r/min.
Embodiment 3:
(1) composition and content are formed: 100 parts of polylactic resin, 5 parts of poly adipate succinic acid ester resins, 15 parts of tributyl citrates, 20 parts in barium sulfate (5000 order), polyethers L610.2 part, 0.5 part of auxiliary agent glycerol.Above material usage by weight.
(2) pre-treatment of raw material: polylactic resin and poly adipate succinic acid ester resin are put in the loft drier, and temperature is 80 ℃, and dry 4h, barium sulfate are 110 ℃, dry 3h; The various starting material that prepare are stirred 3min in the stirring mixer high speed, and stirring at low speed is to mixing.
(3) extruding pelletization: the temperature of each section in the dual-screw-stem machine temperature control section: one section temperature is 110 ℃, two sections temperature are 130 ℃, three sections temperature are 140 ℃, four sections temperature are 160 ℃, five sections temperature are 160 ℃, six sections temperature are 150 ℃, and seven sections temperature are 165 ℃, and the head temperature of dual-screw-stem machine is 170 ℃; Screw speed: 100r/min.
Embodiment 4:
(1) composition and content are formed: 100 parts of polylactic resin, 50 parts of poly adipate succinic acid ester resins, 20 parts of tributyl citrates, 25 parts in barium sulfate (5000 order), polyethers L610.4 part, 1.0 parts of auxiliary agent glycerol.Above material usage by weight.
(2) pre-treatment of raw material: polylactic resin and poly adipate succinic acid ester resin are put in the loft drier, and temperature is 80 ℃, and dry 4h, barium sulfate are 110 ℃, dry 3h; The various starting material that prepare are stirred 3min in the stirring mixer high speed, and stirring at low speed is to mixing.
(3) extruding pelletization: the temperature of each section in the dual-screw-stem machine temperature control section: one section temperature is 110 ℃, two sections temperature are 130 ℃, three sections temperature are 150 ℃, four sections temperature are 155 ℃, five sections temperature are 160 ℃, six sections temperature are 150 ℃, and seven sections temperature are 165 ℃, and the head temperature of dual-screw-stem machine is 170 ℃; Screw speed: 160r/min.
Stretching and shock resistance to the biodegradable toughened polylactic plastics of gained among the above embodiment are tested, and compare take off data such as table 1 with the above performance of conventional poly(lactic acid) plastics:
The stretching of biodegradable toughened polylactic plastics of table 1 and conventional poly(lactic acid) plastics and shock resistance are relatively
| Test event | Unit | Poly(lactic acid) | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 |
| Tensile strength | MPa | 65 | 41 | 37 | 38 | 35 |
| Extension at break intensity | ％ | 5 | 20 | 26 | 16 | 30 |
| Notched Izod impact strength | KJ/m 2 | 2.45 | 6.1 | 7.9 | 5.2 | 8.6 |
More than the technical scheme that the embodiment of the invention provided is described in detail, used specific case herein the principle and the embodiment of the embodiment of the invention are set forth, the explanation of above embodiment only is applicable to the principle that helps to understand the embodiment of the invention; Simultaneously, for one of ordinary skill in the art, according to the embodiment of the invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (14)
1. biodegradable toughened polylactic plastics is characterized in that, are grouped into by following one-tenth: polylactic resin and multipolymer thereof, poly adipate succinic acid ester resin, tributyl citrate, barium sulfate and tensio-active agent.
2. a kind of biodegradable toughened polylactic plastics according to claim 1 is characterized in that: described biodegradable toughened polylactic plastics comprise following composition and parts by weight:
00 part of polylactic resin and copolymer 1 thereof
5～50 parts of poly adipate succinic acid ester resins
10～20 parts of tributyl citrates
20～40 parts in barium sulfate
0.2～0.4 part in tensio-active agent.
3. a kind of biodegradable toughened polylactic plastics according to claim 1, it is characterized in that: described biodegradable toughened polylactic plastics also comprise the auxiliary agent of 0.5～1.0 parts by weight.
4. a kind of biodegradable toughened polylactic plastics according to claim 1, it is characterized in that: the molecular weight of described polylactic resin and multipolymer thereof is 5～300,000.
5. a kind of biodegradable toughened polylactic plastics according to claim 1, it is characterized in that: the molecular weight of described poly adipate succinic acid ester resin is 10～300,000.
6. a kind of biodegradable toughened polylactic plastics according to claim 1, it is characterized in that: the fineness of described barium sulfate is greater than 4000 orders.
7. a kind of biodegradable toughened polylactic plastics according to claim 1, it is characterized in that: described tensio-active agent is a polyether surfactant.
8. a kind of biodegradable toughened polylactic plastics according to claim 7 is characterized in that:
Described polyether surfactant is: one or more among polyethers L31, polyethers L61 and the polyethers L64.
9. a kind of biodegradable toughened polylactic plastics according to claim 2 is characterized in that:
Described auxiliary agent is selected from least a in dispersion agent, tinting material or the lubricant.
10. a kind of biodegradable gain of heat poly(lactic acid) plastics according to claim 9 is characterized in that:
Described dispersion agent is a stearic amide.
11. a kind of biodegradable gain of heat poly(lactic acid) plastics according to claim 9 is characterized in that:
Described tinting material is natural plant dye, diamino heterocyclic.
12. a kind of biodegradable gain of heat poly(lactic acid) plastics according to claim 9 is characterized in that:
Described lubricant is a glycerol.
13. the preparation method of biodegradable toughened polylactic plastics is characterized in that: may further comprise the steps:
(1) in drying plant, respectively resin and barium sulfate are carried out drying;
(2) the various starting material that will prepare by a certain percentage at normal temperatures are stirred in stirring mixer and mix;
(3) mixed starting material are put into twin screw extruder and carry out extruding pelletization.
14. the preparation method of a kind of biodegradable toughened polylactic plastics according to claim 13 is characterized in that: the extrusion condition of described step (3) is:
In twin screw extruder, feeding section temperature is 100～140 ℃, and the compression section temperature is 140～160 ℃, and the metering zone temperature is 150～180 ℃, and the head temperature of twin screw extruder is 170～180 ℃; Screw speed is 95～160r/min.
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| CN106995594A (en) * | 2017-05-23 | 2017-08-01 | 东至县科创塑料制品有限公司 | A kind of novel environment friendly plastic formula |
| CN109593638A (en) * | 2019-01-02 | 2019-04-09 | 大连理工大学 | A kind of system and method that hydrothermal pretreatment promotes polylactic acid plastic degradation methanation to utilize |
| CN111719341A (en) * | 2020-06-27 | 2020-09-29 | 福建益百利包装材料有限公司 | PLA (polylactic acid) film coated paper and production process thereof |
| WO2022099979A1 (en) * | 2020-11-13 | 2022-05-19 | 浙江汇隆新材料股份有限公司 | Method for preparing flame-retardant colored functional environmentally friendly fibers |
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