CN102453319A - Polylactic resin composition film and preparation method thereof - Google Patents
Polylactic resin composition film and preparation method thereof Download PDFInfo
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Abstract
The invention provides a polylactic resin composition film and a preparation method thereof, and relates to the field of plastic processing. The polylactic resin composition film comprises the following components: 100 weight parts of polylactic resin and 0.5 to 5.5 weight parts of functional filler which are blended, wherein the polylactic resin has the weight-average molecular weight of 80,000-300,000 and the molecular weight dispersibility of 1.5-2.2; and the functional filler is at least one of the following inorganic fillers: calcium carbonate, clay, silica, alumina, barium sulfate, calcium sulfate, talc, magnesium sulfate, titanium dioxide, zeolite, aluminum sulfate, kieselguhr, kaolin, calcium oxide and magnesium oxide. The preparation method comprises the following steps of: melting, blending and granulating the components in the proportion, casting and pressing, and biaxially tensioning to obtain the polylactic resin composition film. The film is completely biodegradable, has balanced rigidity and toughness, maintains the tensile strength, has the elongation at break improved by 3 to 7 times compared with the original elongation at break, and has uniform texture, high decorative property, high printing property and unidirectional tearing property.
Description
Technical field
The present invention relates to the resin film technical field, say further, relate to a kind of polylactic acid resin composition film and preparation method thereof.
Background technology
POLYACTIC ACID (PLA) also claim polylactide, is to be initial raw material with the starch that extracts in corn, wheat, the cassava etc., decomposes through enzyme to obtain glucose, becomes lactic acid through behind the lactobacillus-fermented again, the biological degradation thermoplastic polyester that obtains through chemosynthesis at last.POLYACTIC ACID is a kind of complete environment protection biological degradable material with good mechanical properties and biological degradability; Raw material sources are extensive; It is prone to decomposed replacement by the multiple mikrobe of occurring in nature or the intravital enzyme of plant-animal; Final water and the carbonic acid gas of forming, free from environmental pollution, thereby be considered to the most promising biodegradable polymer.The non-toxicity of POLYACTIC ACID makes it can be used for directly and the packing of Food Contact in addition.Aftertreatment aspect, POLYACTIC ACID have outstanding biodegradability, and degraded product is nontoxic, environmentally safe; If carry out burn processing, the heat that POLYACTIC ACID plastics burnings is discharged is merely the half the of general purpose materials such as PE, PS, and does not also have toxic gas during burning and produce.
A kind of polypropylene bidirection drawing film (BOPP) pearlescent synthetic paper masterbatch is disclosed among the patent CN101676324; The wrapping material that can be used as candy, ice cream etc. use; But its matrix is a Vestolen PP 7052, though comparatively environmental protection, mostly its source is the petrochemical complex aspect; The minimizing day by day of petroleum resources and in short supply is unfavorable for its Sustainable development.Though and this method adopts the reinforced method of side direction in order to solve processing difficulties, but the side direction charging system requires also than higher processing units.
The method of toughness reinforcing calcium carbonate filling polylactic acid is disclosed among the patent CN101638509; Though can play toughness reinforcing effect; But this method need be filled a large amount of lime carbonate, and itself also causes burden to screw rod easily POLYACTIC ACID, can cause problems such as processing difficulties, filter screen obstruction.And existing method for toughening improves the POLYACTIC ACID flexible and has also weakened the rigidity that itself has greatly simultaneously, is not suitable for the occasion that some need film to be prone to tear on the contrary.
Summary of the invention:
To the problem that exists in the above-mentioned prior art, an object of the present invention is to provide a kind of polylactic acid resin composition film.The said composition film has biodegradable completely, good processing characteristics, and strong and unyielding balancing performance.Another object of the present invention provides the preparation method of this kind polylactic acid resin composition film.
Polylactic acid resin composition film of the present invention includes the following component of blend:
POLYACTIC ACID: 100 parts by weight; Functional filler: 0.5～5.5 part, preferred 2-5 part.
Matrix resin in the poly (lactic acid) composition described in the present invention is selected bio-based, reproducible polylactic resin for use.POLYACTIC ACID decomposes in soil, water naturally, is non-harmful product through microbiological degradation then.
Polylactic resin (PLA) is also claimed polylactide, because the recyclability in source and the biodegradable performance of itself, it is used and more and more receives people's attention.POLYACTIC ACID can form lactic acid like the starch that from corn, wheat and yam, extracts through lactobacillus-fermented from the renewable resources preparation in a year beyond oil or the gas material, finally forms POLYACTIC ACID through polymerization then.Polylactic resin can be degraded under some compost treatment condition fast, finally is decomposed into water and carbonic acid gas.Because POLYACTIC ACID comes from bio-based, to human non-toxic, environmentally friendly property, the polylactic resin product obtains people's attention gradually.And the rigidity of POLYACTIC ACID own is big, and modulus in flexure is up to more than the 3GPa, and material is more crisp, and deflection is high after the film forming, takes with hand and can not subside, and rocks to have the same clear and melodious sound of sensitive paper.And the elongation of POLYACTIC ACID itself is low, has folding property after the film forming, when folding, has the tendency of returning its virgin state unlike polyolefine, also is referred to as memory.So the POLYACTIC ACID synthetic paper can overcome the shortcoming of other plastic synthetic paper memory.
Polylactic resin of the present invention adopts existing various polylactic resin in the prior art.The weight-average molecular weight of POLYACTIC ACID is 8～300,000, and is preferred 10～25., and more preferably 10～200,000.Molecular weight is too small, and rupture of membranes appears in POLYACTIC ACID easily in biaxial orientation process; If molecular weight is excessive, cause very big difficulty to the course of processing.Simultaneously, requiring molecular weight dispersed (being weight-average molecular weight and number-average molecular weight ratio) is 1.5～2.2, preferred 1.8～2.2.
As the matrix polymer POLYACTIC ACID of the present composition, be to have-CH (CH
3) polymkeric substance of repeating unit of C (O) O-, no matter these repeating units are how to constitute this polymkeric substance.Lactic acid has two kinds of optically active isomers; Be commonly called " D " and " L " enantiomorph; Therefore there be dimeric " the L-rac-Lactide " of 2 L-lactic acid molecules in rac-Lactide; The dimer of 2 D-lactic acid molecules " D-rac-Lactide ", and by 1 L-lactic acid molecules and 1 dimer " meso-rac-Lactide " that the D-lactic acid molecules constitutes.POLYACTIC ACID can be the POLYACTIC ACID that the ratio of any L-lactic acid and D-lactic acid obtains among the present invention.
POLYACTIC ACID among the present invention can adopt existing various POLYACTIC ACID preparation method preparations in the prior art.Polylactic resin can adopt known methods such as polycondensation method, ring-opening polymerization method in the prior art.Polycondensation method is about to the polycondensation of directly dewatering of L-lactic acid or D-lactic acid or their mixture; The ring-opening polymerization method is about to the rac-Lactide open loop and carries out polymerization, uses polymerization regulator to regulate molecular weight in case of necessity.
Polylactic resin can also include other monomers that can carry out copolymerization with rac-Lactide or lactic acid, like oxyalkylene (comprising oxyethane, propylene oxide, butylene oxide ring, tetrahydrofuran etc.) or annular lactone or carbonic ether.The content that these repeating units account for the PLA resin preferably is lower than 10wt%, more preferably accounts for 0-5wt%.
POLYACTIC ACID can also comprise other compounds through the melt strength of polymerization method molecular weight that add, that can improve POLYACTIC ACID, raising POLYACTIC ACID.Like isocyanic ester, acid anhydrides, epoxy compounds, organic peroxy compound.Organo-peroxide comprises alkyl peroxide, ketone peroxide, ester class superoxide, acyl class superoxide.Isocyanic ester comprises diphenylmethanediisocyanate (MDI), 2,4 toluene diisocyanate (TDI)/eylylene diisocyanate (XDI).
In the poly (lactic acid) composition described in the present invention, said functional filler is 0.1～2 μ m for the meta particle size range, the mineral filler of preferred 0.15～1 μ m.Said mineral filler is selected from least a in the following material: lime carbonate, clay, silica, alumina, permanent white, calcium sulfate, talcum powder, sal epsom, titanium oxide, zeolite, Tai-Ace S 150, zeyssatite, magnesiumcarbonate, kaolin, quicklime, Natural manganese dioxide etc.The mixture of one or more in preferred lime carbonate or the titanium oxide.
The above lime carbonate can be selected light calcium carbonate of the prior art or nano-calcium carbonate for use.Light calcium carbonate meta particle size range is at 0.5～2 μ m, and preferred meta particle size range is between 0.6～1 μ m.
The preferred nano-calcium carbonate of functional filler in the poly (lactic acid) composition of the present invention.The industrial production process of nano-calcium carbonate is at certain density Ca (OH)
2Suspension-s in feed dioxide gas and carry out carbonization.Through Ca (OH)
2The temperature of suspension-s, the flow of dioxide gas are controlled the nucleation rate of lime carbonate nucleus; , form control by nucleus and be converted into crystal growth control after form certain nucleus number in carbonization, add the growth velocity of each crystal face of crystalline form regulator control this moment, thereby it is controlled to reach pattern; The continuation carbonization adds dispersion agent adjusting particle surface electric charge to terminal and gets equal dispersive cube calcium carbonate nano particle.
Nano-calcium carbonate can improve the processing characteristics of POLYACTIC ACID, improves its rheological property, dimensional stability, heat-resistant stability, can also play enhancing, toughness reinforcing effect.Concerning polylactic acid film, nano-calcium carbonate fine size and even can make film more evenly smooth.And nano-calcium carbonate has high opacity, high brightness, can change whiteness and opacity that addition improves film as required.The high-expansion of nano-calcium carbonate also can play and reduce film loose density, the effect that reduces cost.Nano-calcium carbonate meta particle size range is 0.1～0.6 μ m; Preferred 0.15～0.3 μ m.
In order to improve the dispersiveness of functional filler in matrix resin PLA, the functional filler particle is carried out the liquid phase surface coat processing.Coating can use field of plastics processing coupling agent commonly used in the prior art, like lipid acid, silane coupling agent or water-soluble titanate coupling agent etc., preferred silane class coupling agent.Consumption also can adopt conventional amount used.At least a in the preferred following material of described silane coupling agent: vinyltrimethoxy silane, aminosilane such as γ-An Jibingjisanyiyangjiguiwan (KH550).Be 100 parts by weight in functional filler in the present composition, the coupling agent consumption is 0.5～1.5 part.It is that coating and functional filler are fully mixed in existing mixing equipment such as impeller evenly that the surface coats treatment process.
In order to improve processing characteristics; Improve compsn and add the oilness in man-hour; Can in resin combination of the present invention, add in polylactic resin be 100 parts by weight; 0.25 the lubricant of the stearic acid of～1 parts by weight comprises Triple Pressed Stearic Acid, calcium stearate, barium stearate, Zinic stearas etc., preferred Zinic stearas.Energy consumption when lubricant can reduce plastic working reduces heat and mechanical stress that the internal friction in the course of processing produces, thereby improves the thermostability of plastics.
Can also include in polylactic resin in the compsn of the present invention is 100 parts by weight, the oxidation inhibitor of 0.2-1.5 weight part.Said oxidation inhibitor is selected from field of plastics processing oxidation inhibitor commonly used in the prior art; Be generally at least a in phosphite ester kind antioxidant, Polyphenols oxidation inhibitor, the organic sulfide kind antioxidant; Be preferably at least a in the following material: β-(3; 5-di-t-butyl-4-hydroxyl-phenyl) propionic acid octadecyl ester (antioxidant 1076), four [β-(3; 5-di-t-butyl-4-hydroxyl-phenyl) propionic acid] pentaerythritol ester (antioxidant 1010), tricresyl phosphite (2, the 4-di-tert-butyl) esters (oxidation inhibitor 168), Tyox B (DLTP), thio-2 acid SUNSOFT Q-182S (DSTP); The wherein most preferably mixing of antioxidant 1010 and oxidation inhibitor 168.
Can add in the poly (lactic acid) composition of the present invention also and can not add pearlescence; Specifically decide as required, preferably add pearlescence, the film that can be the said composition manufacturing brings good surface appearance and color and luster; Improve the opacity of film together with functional stuffing, adapt to different application scenarios.In polylactic resin is 100 weight parts, and the pearlescence addition is 5-10 part.Said pearlescence can adopt existing various pearlescences in the prior art.
In order to adjust the physicals of the various present compositions, can in compsn, add plastic processing additives commonly used in the prior art again, like thermo-stabilizer, photostabilizer, softening agent, pigment etc.Addition is a conventional amount used.
The preparation method of polylactic acid resin composition film according to the invention comprises said component by the granulation of said consumption melt blending, curtain coating compressing tablet, two-way stretch and make described polylactic acid resin composition film.
Method of the present invention specifically comprises the steps:
(1) melt blending
Said polylactic resin, functional filler are mixed with said amount in interior component; With the material melt blending that mixes, extruding pelletization is dried again; The melt blending temperature remains between 170-200 ℃.
In the above-mentioned preparation process, the blending equipment of mixing of materials can adopt various mixing equipment general in the prior art, like stirrer, kneading machine etc.Employed melt blending equipment is the general blending equipment in the rubber and plastic processing industry, can be twin screw extruder, single screw extrusion machine, mill or Banbury mixer etc.
(2) curtain coating compressing tablet
To join the casting machine from the forcing machine extruding pelletization of a last step and through the exsiccant compsn, through extruding the formation cast-sheet.Consider the PLA characteristics that modulus is high at normal temperatures, hardness is big; Machine barrel one district (feeding section) temperature in casting machine is made as 195 ℃～210 ℃ so that pellet softening; The melt blending temperature of curtain coating compressing tablet is 170～200 ℃; Concrete as: machine barrel two districts, three districts, three districts, draping district, shunting zone temperature are respectively 180 ℃, 170 ℃, 170 ℃, 170 ℃, 170 ℃, and the TR in die head one district, die head two districts (discharge end) is 155 ℃-165 ℃.The discharge end temperature remains between the 155-165 ℃ of lower temperature, because the melt strength of PLA itself is very low, makes that the melt strength of mixture is lower after adding a large amount of mineral fillers, if the curtain coating temperature is high, then being difficult to can the casting film-forming sheet.Said diaphragm-operated thickness is adjusted as required, generally can be 200-500 μ m.
(3) two-way stretch.
The tape casting diaphragm that comes out through the casting machine curtain coating carries out two-way stretch in biaxial orientation stretching machine.Draft temperature in the wherein said two-way stretch is 75-100 ℃.
Two-way stretch can be taked same footwork (promptly carrying out MD, TD direction simultaneously), also can take the method for fractional steps stretch (first MD direction, promptly casting machine flows out the direction of cast sheet; Back TD direction).With the footwork concrete grammar be: at 75-90 ℃ of following preheating 30-80s, under this temperature, carry out the stretching of MD, TD direction then simultaneously, wherein MD stretching 2-5 times, preferred 3-4 times, TD stretching 2-5 times, preferred 3-4 times.At last can be unannealed, also can under 120-130 ℃, carry out anneal 10-40s.Through cutting edge, rolling.Obtaining thickness at last is the poly (lactic acid) composition resin film of 20-70 μ m.In addition, two-way stretch also can take the method for fractional steps to carry out, and concrete grammar is: at 75-90 ℃ of following preheating 30-80s, under this temperature, carry out the stretching of MD direction then, stretching ratio is 2-5 times, and preferred 3-4 doubly; Preheating 10-30s under 80-95 ℃ of temperature carries out the stretching of 2-5 TD direction doubly under this temperature then, and preferred 3-4 doubly.At last can be unannealed, also can under 120-130 ℃, carry out anneal 10-40s.Through cutting edge, rolling.Obtain the poly (lactic acid) composition resin film at last.Film thickness can be adjusted at 20-70 μ m as required.
The poly (lactic acid) composition resin film that the present invention makes can be used for preparing wrapping material, label with film etc.
The poly (lactic acid) composition resin treatment good fluidity that the present invention makes; By its film that makes biodegradable is completely arranged; And only need a small amount of functional filler just can improve the processing fluidity of polylactic resin; Make film reach the balance of strong and unyielding performance, when keeping the film stretching strength degradation few, elongation at break is increased to 3-7 times of former extension at break.And improved the processing difficulties problem that big additive capacity causes effectively.Can make the film of pearl effect as required, quality is even, and ornamental strong, printing performance is good, and has unidirectional tearability.The polylactic acid polymer resin film working method that the present invention proposes is simple, helps promoting the application of POLYACTIC ACID aspect film, save energy, protection environment.
Embodiment:
Below in conjunction with embodiment, further specify the present invention, scope of the present invention does not receive the restriction of these embodiment.
Below be the raw material in the embodiment Comparative Examples:
Polylactic resin PLA:
A. U.S. Natureworks produces, trade mark PLA4032D, and weight-average molecular weight is about 150,000, and specific dispersivity is 2.1;
B. U.S. Natureworks produces, trade mark PLA3051D, and weight-average molecular weight is about 140,000, and specific dispersivity is 2.1;
Antioxidant 1010: four [β-(3,5-di-t-butyl-4-hydroxyl-phenyl) propionic acid] pentaerythritol ester, Switzerland Ciba company produces
Oxidation inhibitor 168: tricresyl phosphite (2, the 4-di-tert-butyl) ester, Switzerland Ciba company produces
Zinic stearas: Tianjin fine chemistry industry institute
Silane coupling agent KH550: γ-An Jibingjisanyiyangjiguiwan, the Nanjing moral can chemical industry ltd
Nano-calcium carbonate: the meta particle diameter is 0.2 μ m; Huaming, Jiangxi nano-calcium carbonate ltd produces
Light calcium carbonate: the meta particle diameter is 1 μ m; Huaming, Jiangxi nano-calcium carbonate ltd produces
Pearlescence LB8000: particle diameter＜15 μ m, Shandong are insulted precious pearly pigment ltd
Embodiment 1-9:
With the polylactic resin PLA after the vacuum-drying and oxidation inhibitor (1: 1 mixture of 1010 and 168 weight ratios), lubricant stearic acid zinc, pearlescence, through the nano-calcium carbonate after the silane coupling agent KH550 surface modification treatment and or light calcium carbonate after silane coupling agent KH550 surface modification treatment in high speed agitator, mix according to quantity; The material that mixes is added in the feeder of WP40 twin screw extruder, material gets in the twin screw via feeder, and is even through the screw rod melting mixing, extruding pelletization, oven dry.The temperature of screw rod remains between 170～200 ℃ in the course of processing, and screw speed is controlled between 200～350rpm.
Through extruding the exsiccant material via casting machine (Shantou City's brilliance machinery Industrial Co., Ltd.); It is the diaphragm of 200-500 μ m that curtain coating becomes thickness; Machine barrel one district (feeding section) temperature in the casting machine is made as 200 ℃; Machine barrel two districts, three districts, four districts, looped network district, shunting zone temperature are respectively 180 ℃, 170 ℃, 170 ℃, 170 ℃, 170 ℃, and the temperature in die head one district, die head two districts is 160 ℃, 160 ℃.Tape casting diaphragm at 80 ℃ of following preheating 60s, carries out the stretching of MD, TD direction then simultaneously under this temperature in biaxial orientation stretching machine (German Bruckner), wherein MD stretching 2-5 times, TD stretching 2-5 doubly.Obtaining thickness at last is the poly (lactic acid) composition resin film of 40 μ m.Concrete prescription is seen table 1, and wherein each component concentration is all in weight part.Results of property is as shown in table 2.
Annotate: the described nano-calcium carbonate of handling through silane coupling agent is after 1 part of silane coupling agent KH550 is added the nano-calcium carbonate of 100 parts by weight, mixes through impeller to get final product.
The described light calcium carbonate of handling through silane coupling agent is after 1 part of silane coupling agent KH550 is added the light calcium carbonate of 100 parts by weight, mixes through impeller to get final product.
Comparative Examples 1-2:
Except that concrete prescription difference, all the other conditions are all identical with previous embodiment 1-6.Concrete prescription is seen table 1, and wherein each component concentration is all in weight part.Results of property is as shown in table 2.In the table, nano-calcium carbonate is represented with CC1; Light calcium carbonate is represented with CC2.
Table 1
Table 2
The film that makes through present method has pearl effect, and quality is even, and is ornamental strong, strong covering power, and printing performance is good, and has unidirectional tearability.And only add under the situation of a small amount of functional filler, just can improve the processing fluidity of polylactic resin, make film reach the balance of strong and unyielding performance, when keeping the film stretching strength degradation few, elongation at break is increased to 3-7 times of former extension at break.And the processing film method is simple, helps promoting the application of POLYACTIC ACID aspect film, save energy, protection environment.
Claims (17)
1. polylactic acid resin composition film includes the following component of blend:
Polylactic resin 100 weight parts
Functional filler 0.5～5.5 weight part
The weight-average molecular weight of wherein said polylactic resin is 8～300,000, and the molecular weight dispersiveness is 1.5～2.2;
Wherein said functional filler is the mineral filler of meta particle size range at 0.1～2 μ m, is selected from least a in the following material: lime carbonate, clay, silica, alumina, permanent white, calcium sulfate, talcum, sal epsom, titanium oxide, zeolite, Tai-Ace S 150, zeyssatite, magnesiumcarbonate, kaolin, quicklime, Natural manganese dioxide.
2. according to the said polylactic acid resin composition film of claim 1, it is characterized in that:
Wherein said functional filler is that the meta particle size range is at 0.15～1 μ m.
3. according to the said polylactic acid resin composition film of claim 1, it is characterized in that:
Wherein said polylactic resin weight-average molecular weight is 10～250,000.
4. according to the said polylactic acid resin composition film of claim 1, it is characterized in that:
The molecular weight dispersiveness of wherein said polylactic resin is 1.8～2.2.
5. polylactic acid resin composition film according to claim 1 is characterized in that:
Wherein said functional filler is 100 parts by weight in polylactic resin, is 2～5 parts.
6. polylactic acid resin composition film according to claim 1 is characterized in that:
Wherein said functional filler is selected from least a in lime carbonate or the titanium oxide.
7. polylactic acid resin composition film according to claim 6 is characterized in that:
Wherein said functional filler is a lime carbonate, and said lime carbonate is selected at least a in light calcium carbonate, the nanometer grade calcium carbonate for use; The meta particle size range of said light calcium carbonate is 0.5～2 μ m; The meta particle size range of said nanometer grade calcium carbonate is 0.1～0.6 μ m.
8. polylactic acid resin composition film according to claim 7 is characterized in that:
Wherein said nano-calcium carbonate meta particle size range 0.15～0.3 μ m; The meta particle size range of said light calcium carbonate is 0.6～1 μ m.
9. polylactic acid resin composition film according to claim 1 is characterized in that:
Wherein said functional filler carries out surface-treated with coupling agent, and said coupling agent is selected from least a in lipid acid, water-soluble titanium esters of gallic acid, the silane coupling agent; In functional filler is 100 parts by weight, and the consumption of coupling agent is 0.5～1.5 parts by weight.
10. polylactic acid resin composition film according to claim 9 is characterized in that:
Wherein said silane coupling agent is selected from vinyltrimethoxy silane, at least a in the aminosilane.
11. polylactic acid resin composition film according to claim 1 is characterized in that:
Wherein including in polylactic resin is 100 parts by weight, the lubricant of 0.25～1 parts by weight; Said lubricant is selected from the lubricant of stearic acid.
12. polylactic acid resin composition film according to claim 11 is characterized in that:
Wherein said lubricant comprises at least a in Triple Pressed Stearic Acid, calcium stearate, barium stearate, the Zinic stearas.
13. polylactic acid resin composition film according to claim 1 is characterized in that:
Wherein including in polylactic resin is 100 parts by weight, and the oxidation inhibitor of 0.2～1.5 weight part, said oxidation inhibitor are selected from least a in phosphite ester kind antioxidant, Polyphenols oxidation inhibitor, the organic sulfide kind antioxidant.
14. polylactic acid resin composition film according to claim 13 is characterized in that:
Wherein said oxidation inhibitor is selected from β-(3; 5-di-t-butyl-4-hydroxyl-phenyl) propionic acid octadecyl ester, four [β-(3; 5-di-t-butyl-4-hydroxyl-phenyl) propionic acid] at least a in the pentaerythritol ester, tricresyl phosphite (2, the 4-di-tert-butyl) ester, Tyox B, thio-2 acid SUNSOFT Q-182S.
15. polylactic acid resin composition film according to claim 1 is characterized in that:
Wherein including in polylactic resin is 100 parts by weight, the pearlescence of 5～10 weight parts.
16., comprise with said component curtain coating compressing tablet, two-way stretch and make described polylactic acid resin composition film according to the preparation method of each described polylactic acid resin composition film of claim 1～15 by the granulation of said consumption melt blending.
17. the preparation method according to the said polylactic acid resin composition film of claim 16 is characterized in that:
The melt blending temperature of wherein said melt blending granulation is 170-200 ℃;
Casting machine feeding section temperature is 195～210 ℃ in the wherein said curtain coating compressing tablet, and the melt blending temperature of curtain coating compressing tablet is 170-200 ℃, 155～165 ℃ of discharge end temperature;
Draft temperature in the wherein said two-way stretch is 75-100 ℃.
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