CN103374213A - Preparation method of polylactic acid/montmorillonite nano composite material - Google Patents
Preparation method of polylactic acid/montmorillonite nano composite material Download PDFInfo
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- CN103374213A CN103374213A CN2012101240766A CN201210124076A CN103374213A CN 103374213 A CN103374213 A CN 103374213A CN 2012101240766 A CN2012101240766 A CN 2012101240766A CN 201210124076 A CN201210124076 A CN 201210124076A CN 103374213 A CN103374213 A CN 103374213A
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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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
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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
-
- 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
- B29C2948/92904—Die; Nozzle zone
Abstract
The invention belongs to the technical field of high polymer materials, and particularly relates to a preparation method of a polylactic acid/montmorillonite nano composite material. The main raw materials are polylactic acid, organic modified montmorillonite with different interlamellar spacings, compatilizer and antioxidant. The method comprises the following steps: carrying out melt blending on polylactic acid and organic modified montmorillonite to obtain a master batch, and carrying out melt blending on polylactic acid and the master batch to obtain the polylactic acid/montmorillonite nano composite material. The method provided by the invention enables the polylactic acid melt intercalation to be easier, and enhances the dispersion uniformity of the montmorillonite in the polymeric matrix; and the compatilizer is added to enhance the intercalation effect, so that the montmorillonite lamellae are dispersed more uniformly. The method provided by the invention is simple and effective in technique; and the obtained composite material has the advantages of obviously higher mechanical properties and heat resistance, is completely biodegradable, and has wide application range.
Description
Technical field
The invention belongs to technical field of polymer materials, be specifically related to a kind of preparation method of Nano-composite material of poly lactic acid/montmorillonite.
Background technology
Poly(lactic acid) (PLA) is a kind of green material, and raw material sources are in reproducible farm crop, and the most outstanding advantage is biodegradability, and the degradable generation carbonic acid gas of energy and water are free from environmental pollution after the use.It is high that poly(lactic acid) also has good mechanical property, thermoplasticity, fiberizability, transparency, is applicable to blowing, extrudes, the multiple working method such as injection moulding, easy to process, is decided to be the most rising new packaging material of new millennium by industrial community.But the mechanical property of pure poly(lactic acid) and other character can not be satisfied the demand usually such as thermostability, barrier, good solubility-resistence, flame retardant resistance etc., and this just impels people that the modification of poly-lactic acid material is launched deep research.Traditional method of modifying is with poly(lactic acid) and other superpolymer blend or adding inorganic fillers, can only improve some performance of poly(lactic acid), the very difficult over-all properties that improves poly(lactic acid).Patent CN03149911.2 has disclosed a kind of biodegradable resin composite manufacture method, body material is selected poly(lactic acid), polynite and mica, talcum etc. are as filler (5～50wt.%), the matrix material modulus in flexure that obtains and flame retardant resistance have in various degree raising, but other performances of this matrix material are not described in detail in detail in this patent.
Poly(lactic acid) is inserted between clay layer, utilize its special nano level laminated structure, can effectively improve material property, obtain the character more excellent than conventional composite materials, such as intensity, toughness, thermo-oxidative stability, barrier and unique self-extinguishing, biological degradation adjustability.Therefore nano combined is a kind of very effective method of improving the poly(lactic acid) performance.Polynite is a kind of natural clay mineral, and the source is abundant, and is cheap, is to have one of desirable mineral of commercial value and actual application prospect at present most.The preparation Nano-composite material of poly lactic acid/montmorillonite mainly contains three kinds of methods: polymers soln graft process, in-situ inserted polymerization, polymer melt graft process.The human cetyltrimethyl ammonium salt such as Jin-Hae Chang of U.S. Cornell university are modified montmorillonoid and fluorine mica respectively, adopt the method for solution intercalation to prepare poly(lactic acid)/clay nanocomposites, mechanical property is significantly improved, but complex technical process, and the organic solvent that uses is to harmful (the Chang J.H. of environment, An Y.U., ChoD.Polymer.2003,44.3715-3720).The human organic modification montmonrillonite such as the Marie-Am é lie Paul of Belgium Mons-Hainaut university and L-rac-Lactide in-situ polymerization obtain Nano-composite material of poly lactic acid/montmorillonite (Paul M.-A., Delourt C., Alexandre M.et al.Macromolecular Chemistry and Physics.2004,206,484-498), but raw materials used rac-Lactide is expensive, the in addition difficult control of preparation process condition, the operation poor repeatability is difficult to large-scale industrial production.Because the polymer melt intercalation is not used solvent, technique is simple, and can reduce the pollution to environment, thereby the polymer melt intercalation has great application prospect.The people such as Suprakas Sinha Ray of Japan Toyota Technological Institute are take ε-PCL as compatilizer, melt extrude with twin screw extruder after in the sack of drying, mixing with artificial fluorine mica, saponite, organic modification montmonrillonite etc. and poly(lactic acid), the nano composite material mechanical property and the thermotolerance that obtain improve, but the silicate lamella has obvious heap in the poly(lactic acid) matrix, disperse also not too even (RayS.S.S., Okamoto M.Macromolecular.Rapid Communications.2003,24,815-840).As seen there is no a kind of gratifying method for preparing Nano-composite material of poly lactic acid/montmorillonite in the prior art.
Summary of the invention
The object of the present invention is to provide that a kind of method is simple, realize easily on the technique, the preparation method of well behaved Nano-composite material of poly lactic acid/montmorillonite.
The preparation method of the Nano-composite material of poly lactic acid/montmorillonite that the present invention proposes gets masterbatch with poly(lactic acid), organic modification montmonrillonite melt blending first, again poly(lactic acid) and masterbatch melt blending is namely got product.The actual conditions of preparation is: with poly(lactic acid), polynite vacuum-drying (after making moisture content＜50ppm), add expanding material, oxidation inhibitor mixing, use the twin screw extruder melt blending, react and extrude, extrusion temperature is 155-200 ℃, screw speed is 50-150rpm, obtains masterbatch, and wherein each weight percent that forms is:
Poly(lactic acid): 50-80%
Organic modification montmonrillonite: 15-45%
Compatilizer: 0-30%
Oxidation inhibitor: 0.5-1%
Poly(lactic acid), masterbatch, oxidation inhibitor are mixed, use the twin screw extruder melt blending, react and extrude, extrusion temperature is 155-200 ℃, and screw speed is 50-150rpm, and the residence time of material is 4-8 minute, obtain product, wherein the weight percent of each component is:
Poly(lactic acid): 70-95%
Masterbatch: 5-30%
Oxidation inhibitor: 0.5-1%.
Among the present invention, compatilizer can adopt one or more in polycaprolactone (PCL), polyhydroxyalkanoate (PHA), polyoxyethylene glycol (PEG) or the Resins, epoxy.
Among the present invention, oxidation inhibitor can adopt tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) ester, phosphorous acid ester three (2,4-di-tert-butyl phenyl) dimer of ester, phosphorous acid benzene two isodecyl esters, three (nonyl is for phenyl) phosphorous acid esters or tricresyl phosphite (nonyl phenyl ester), pentaerythritol bis-phosphite two (2,4-di-tert-butyl phenyl) ester, many alkyl dihydroxyphenyl propane phosphorous acid ester or in the trimerical mixture one or more.
Among the present invention, organic modification montmonrillonite can be used the art methods modification, and the cationite of machine modified montmorillonoid is Cetyltrimethylammonium bromide, octadecyl trimethyl ammonium chloride, cetyl trimethylammonium bromide, palmityl trimethyl ammonium chloride, double hexadecyl ammonium salt, two octadecyl ammonium salt, Dodecyl trimethyl ammonium chloride, dodecylbenzyl alkyl dimethyl ammonium chloride, dodecyl dimethyl second betaine, tetramethyl ammonium chloride, 4 bromide, tetraethylammonium bromide or ammonium lauryl sulfate etc.Polynite after the modification is through the X-Ray diffraction analysis, and its interlamellar spacing is 1.5-8.0nm, after poly-newborn alkene is inserted in the polynite of this interlamellar spacing, composite materials property is improved, and processing characteristics is also good.
Among the present invention, it is 25: 1～45: 1 that used extrusion equipment adopts screw slenderness ratio, has special screw combinations, with the twin screw extruder of exhaust and high-shear mixing plasticizing effect.
Among the present invention, imvite modified after, to be screened to particle diameter be 20-100 μ m and to obtain masterbatch respond well for poly-newborn alkene melt blending through grinding.
The invention has the advantages that:
(1) polynite is after modification, and interlamellar spacing enlarges, and makes the poly(lactic acid) fusion intercalation easier;
(2) adopt the mother material preparation, improved the dispersing uniformity of polynite in polymeric matrix;
(3) adding of compatilizer has strengthened the reactive force between poly(lactic acid) and the polynite, has improved the stability of montmorillonite layer in the poly(lactic acid) matrix, and its adhesion order is increased, and arranges more regular;
(4) adopt the twin screw extruder of big L/D ratio, guaranteed the quality of resin;
(5) preparation method is simply effective, and organic modification montmonrillonite is uniformly dispersed in the poly(lactic acid) matrix, arranges in order, has formed intercalation or lift-off structure, and the nano composite material that obtains has good over-all properties.Tensile strength and flexural strength have all improved 5～15%, and modulus in flexure has improved 10～20%, and Vicat softening point has improved about 30 ℃, and its performance sees Table 1.
Description of drawings
Fig. 1 is the transmission electron microscope picture of the Nano-composite material of poly lactic acid/montmorillonite that obtains among the embodiment 4.Wherein Fig. 1 (a) is not for containing the TEM figure that compatilizer, polynite content are 4% PLA/MMT nano composite material, Fig. 1 (b) is for having added the TEM figure that 1.0g Resins, epoxy, polynite content are 4% PLA/MMT nano composite material, as seen from the figure, after adding Resins, epoxy, montmorillonite layer is more uniform to be dispersed in the poly(lactic acid) matrix, can also observe the montmorillonite layer of a part of Individual existence, therefore can think to have made part intercalation part exfoliated nano-composite.
Embodiment
Embodiment 1
100g poly(lactic acid), 25g organic modification montmonrillonite, 0.9g oxidation inhibitor phosphorous acid ester three (2,4-di-tert-butyl phenyl) ester are mixed, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, and screw speed is 50-150rpm, gets masterbatch; Then 100g poly(lactic acid) and 5.1g masterbatch, 0.8g oxidation inhibitor phosphorous acid benzene two isodecyl esters are mixed, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, and screw speed is 50-150rpm, and the residence time of material is 4-8 minute, gets product.Its performance sees Table 1.
Embodiment 2
With 100g poly(lactic acid), 20g organic modification montmonrillonite, 0.95g oxidation inhibitor phosphorous acid ester three (2,4-di-tert-butyl phenyl) ester mixes, and uses the twin screw extruder extruding pelletization, and extrusion temperature is 155～200 ℃, screw speed is 50-150rpm, gets masterbatch; Then 100g poly(lactic acid) and 12.3g masterbatch, 0.8g oxidation inhibitor tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester are mixed, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, screw speed is 50-150rpm, and the residence time of material is 4-8 minute, gets product.Its performance sees Table 1.
Embodiment 3
100g poly(lactic acid), 30g organic modification montmonrillonite, 1.0g oxidation inhibitor tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester are mixed, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, and screw speed is 50-150rpm, gets masterbatch; Then 100g poly(lactic acid) and 18.06g masterbatch, 0.8g oxidation inhibitor tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester are mixed, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, screw speed is 50-150rpm, and the residence time of material is 4-8 minute, gets product.Its performance sees Table 1.
Embodiment 4
100g poly(lactic acid), 40g organic modification montmonrillonite, 1.1g oxidation inhibitor are mixed, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, and screw speed is 50-150rpm, gets masterbatch; Then 100g poly(lactic acid) and 22.3g masterbatch, 0.8g oxidation inhibitor three (nonyl is for phenyl) phosphorous acid ester are mixed, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, and screw speed is 50-150rpm, the residence time of material is 4-8 minute, gets product.Its performance sees Table 1, and its structure is seen Fig. 1.
Embodiment 5
100g poly(lactic acid), 26.7g organic modification montmonrillonite, 6.7gPCL, 1.33g oxidation inhibitor three (nonyl is for phenyl) phosphorous acid ester are mixed, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, and screw speed is 50-150rpm, gets masterbatch; Then with 100g poly(lactic acid) and 10g masterbatch, 0.8g oxidation inhibitor pentaerythritol bis-phosphite two (2,4-di-tert-butyl phenyl) ester mixes, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, screw speed is 50-150rpm, the residence time of material is 4-8 minute, gets product.Its performance sees Table 1.
Embodiment 6
100g poly(lactic acid), 28.6g organic modification montmonrillonite, 14.3g polyoxyethylene glycol (PEG), 1.43g oxidation inhibitor tricresyl phosphite (nonyl phenyl ester) are mixed, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, and screw speed is 50-150rpm, gets masterbatch; Then with 100g poly(lactic acid) and 10g masterbatch, 0.8g oxidation inhibitor pentaerythritol bis-phosphite two (2,4-di-tert-butyl phenyl) ester mixes, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, screw speed is 50-150rpm, the residence time of material is 4-8 minute, gets product.Its performance sees Table 1.
Embodiment 7
100g poly(lactic acid), 25g organic modification montmonrillonite, 3.1g Resins, epoxy, 1.28g oxidation inhibitor are mixed, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, and screw speed is 50-150rpm, gets masterbatch; Then 100g poly(lactic acid) and 20.5g masterbatch, 0.8g oxidation inhibitor tricresyl phosphite (nonyl phenyl ester) are mixed, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, and screw speed is 50-150rpm, the residence time of material is 4-8 minute, gets product.Its performance sees Table 1.
Embodiment 8
With 100g poly(lactic acid), 25g organic modification montmonrillonite, 6.25g Resins, epoxy, 1.31g oxidation inhibitor phosphorous acid ester three (2,4-di-tert-butyl phenyl) ester and phosphorous acid benzene two isodecyl esters mix, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, screw speed is 50-150rpm, gets masterbatch; Then 100g poly(lactic acid) and 21g masterbatch, 0.8g oxidation inhibitor tricresyl phosphite (nonyl phenyl ester) are mixed, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, and screw speed is 50-150rpm, the residence time of material is 4-8 minute, gets product.Its performance sees Table 1.
Embodiment 9 (Comparative Examples)
After 100g poly(lactic acid) drying, mix with 1g oxidation inhibitor phosphorous acid ester three (2,4-di-tert-butyl phenyl) ester, use the twin screw extruder extruding pelletization, extrusion temperature is 155～200 ℃, screw speed is 50-150rpm, gets comparative sample.Its performance sees Table 1.
Embodiment 10
Be the sodium-based montmorillonite 4.0g of 80meq/100g with the cationic exchange total amount, adding distil water 80ml, after being uniformly dispersed, high-speed stirring 40min gets suspension, is heated to 80 ℃; 10g octadecyl trimethyl ammonium chloride or distearyl dimethyl ammonium chloride are dissolved in the 25ml distilled water, are configured to solution, be heated to 80 ℃.Under the agitation condition above-mentioned intercalator solution is added drop-wise in the suspension, temperature maintains 80 ℃, and strong stirring one hour removes supernatant liquid, suction filtration with distilled water wash repeatedly, detects filtrate extremely without chlorion with 0.2% silver nitrate solution, drying, grind, sieve, get organically modified montmorillonite clay.
Embodiment 11
Be the sodium-based montmorillonite 3.0g of 100meq/100g with the cationic exchange total amount, adding distil water 200ml, after being uniformly dispersed, high-speed stirring 40min gets suspension, is heated to 80 ℃; 5g Cetyltrimethylammonium bromide or DDA are dissolved in the 25ml distilled water, are configured to solution, be heated to 80 ℃.Under the agitation condition above-mentioned intercalator solution is added drop-wise in the suspension, temperature maintains 80 ℃, and strong stirring one hour removes supernatant liquid, suction filtration with distilled water wash repeatedly, detects filtrate extremely without bromide anion with 0.2% silver nitrate solution, drying, grind, sieve, get organically modified montmorillonite clay.
The over-all properties of table 1 Nano-composite material of poly lactic acid/montmorillonite
Claims (6)
1. the preparation method of a Nano-composite material of poly lactic acid/montmorillonite is characterized in that first poly(lactic acid), organic modification montmonrillonite melt blending being got masterbatch, again poly(lactic acid) and masterbatch melt blending is namely got product; The actual conditions of preparation is: after poly(lactic acid), polynite vacuum-drying, add expanding material, oxidation inhibitor mixing, use the twin screw extruder melt blending, react and extrude, extrusion temperature is 155-200 ℃, screw speed is 50-150rpm, obtains masterbatch, and wherein each weight percent that forms is: poly(lactic acid): 50-80%
Organic modification montmonrillonite: 15-45%
Compatilizer: 0-30%
Oxidation inhibitor: 0.5-1%
Poly(lactic acid), masterbatch, oxidation inhibitor are mixed, use the twin screw extruder melt blending, react and extrude, extrusion temperature is 155-200 ℃, and screw speed is 50-150rpm, and the residence time of material is 4-8 minute, obtain product, wherein the weight percent of each component is:
Poly(lactic acid): 70-95%
Masterbatch: 4.5-30%
Oxidation inhibitor: 0.5-1%.
2. the preparation method of Nano-composite material of poly lactic acid/montmorillonite according to claim 1 is characterized in that compatilizer is one or more in polycaprolactone, polyhydroxyalkanoate, polyoxyethylene glycol or the Resins, epoxy.
3. the preparation method of Nano-composite material of poly lactic acid/montmorillonite according to claim 1, it is characterized in that oxidation inhibitor can adopt tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) ester, phosphorous acid ester three (2,4-di-tert-butyl phenyl) dimer of ester, phosphorous acid benzene two isodecyl esters, three (nonyl is for phenyl) phosphorous acid esters or tricresyl phosphite (nonyl phenyl ester), pentaerythritol bis-phosphite two (2,4-di-tert-butyl phenyl) ester, many alkyl dihydroxyphenyl propane phosphorous acid ester or in the trimerical mixture one or more.
4. the preparation method of Nano-composite material of poly lactic acid/montmorillonite according to claim 1, the cationite that it is characterized in that organic modification montmonrillonite is Cetyltrimethylammonium bromide, octadecyl trimethyl ammonium chloride, cetyl trimethylammonium bromide, palmityl trimethyl ammonium chloride, the double hexadecyl ammonium salt, two octadecyl ammonium salts, Dodecyl trimethyl ammonium chloride, the dodecylbenzyl alkyl dimethyl ammonium chloride, dodecyl dimethyl second betaine, tetramethyl ammonium chloride, 4 bromide, tetraethylammonium bromide or ammonium lauryl sulfate a kind of.
5. the preparation method of Nano-composite material of poly lactic acid/montmorillonite according to claim 1, the interlamellar spacing that it is characterized in that organic modification montmonrillonite is 1.5-8.0nm.
6. the preparation method of Nano-composite material of poly lactic acid/montmorillonite according to claim 1 is characterized in that the particle diameter of organic modification montmonrillonite is 20-100 μ m in the matrix material.
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| CN104877315A (en) * | 2015-05-08 | 2015-09-02 | 常州龙骏天纯环保科技有限公司 | Preparation method of high-barrier-property polylactic acid nano composite material |
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