CN103524880A - Production process for special modified polypropylene coating material - Google Patents
Production process for special modified polypropylene coating material Download PDFInfo
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- CN103524880A CN103524880A CN201310518972.5A CN201310518972A CN103524880A CN 103524880 A CN103524880 A CN 103524880A CN 201310518972 A CN201310518972 A CN 201310518972A CN 103524880 A CN103524880 A CN 103524880A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/246—Intercrosslinking of at least two polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
- C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D123/10—Homopolymers or copolymers of propene
- C09D123/12—Polypropene
-
- 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
- B29C2948/92895—Barrel or housing
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
Abstract
The invention employs a three-step process for preparation of a special modified polypropylene coating material. The process comprises the following steps: step 1, uniformly blending 50 to 70% (wt) of homo-polypropylene powder and 30 to 50% (wt) of low density polyethylene, then adding 0.6 to 1.5% (wt) of a cross-linking agent and carrying out extrusion and granulation to prepare a cross-linking substance; step 2, uniformly mixing the cross-linking substance with EVA according to a proportion of 50 parts (wt): 50 parts (wt) and carrying out extrusion and granulation to prepare a modifying agent; and step 3, adding 5 to 10% (wt) of the modifying agent into the homo-polypropylene powder, adding a proper amount of a molecular weight regulator, carrying out uniform mixing and controlling the melt index of the special modified polypropylene coating material at the outlet of a granulator to be in a range of 32 +/- 1 g/10 min by controlling the temperature of each section of an extruder.
Description
Technical field
The present invention relates to polypropylene modification technical field, particularly polypropylene and polyethylene crosslinking substance and EVA blend are made to high fondant-strength blend, this high fondant-strength blend is added in homo-polypropylene, blending extrusion granulation is produced polypropylene and is coated with special material coated again.
Background technology
Along with the develop rapidly of Flexible-Packaging Industry, the painting used of the goods such as various packing bags, decorative pocket, functional film is special material coated is also constantly developing.At present, conventional coating level PP Pipe Compound kind has both at home and abroad: PE, PP, EVA, EAA etc.But due to the demand of complete processing, wrapping material outward appearance, cost and quality safety, market adopts PP, PE coating material kind more, and progressively with polypropylene coating material, substituted polyethylene coating material both at home and abroad in recent years, or part substitutes.
Polypropylene is coated with special material coated production technique and is broadly divided into three classes: the one, and multi-component copolymer production technique; The 2nd, hydrogen is adjusted homo-polypropylene technique; The 3rd, edman degradation Edman modification homo-polypropylene technique.
Wherein easy with edman degradation Edman modification homo-polypropylene explained hereafter method, input cost is low, domestic and international big or small manufacturing enterprise is innumerable, product category is various, this production technique mainly be take as main in domestic coating material market.Edman degradation Edman homo-polypropylene be coated with special material coated due to produce universal wide, quality product is uneven, has on the whole following defect:
1, melt strength is on the low side, narrow molecular weight distribution.
2, welding weak effect, heat-sealing temperature is high, sealing by fusing narrow range.
3, shrinking percentage is large, and the molten power of hanging down is little, and casting film-forming necking phenomenon is serious.
4, in curtain coating process, thickness evenness is poor, levelling property is poor.
During the independent use procedure of homo-polypropylene coating material, the problem that downstream user often occurs aborning has:
1, woven bag coating is too thick, generally at 10-15g/m
2.User's general requirement is 7-8g/m
2.
2, coating speed is slow, surpasses that 80m/min easily appears, rupture of membranes, gauge control be poor.
3, woven bag stripping strength (fastness) does not reach requirement.
4, mould in color printing coating procedure, gauge control fluctuation is large, and heat seal strength is low, and especially middle seam intensity does not reach requirement.
5, in paper coating procedure, technological temperature can fall, and coating speed is too low.
6, woven bag, paper plastic bag, BOPP Film laminated bag etc., in coating procedure, necking phenomenon is serious.
7, cannot well stable use on cement package bags.
Because edman degradation Edman homo-polypropylene coating material exists above defect, therefore, downstream user needs to add other resin and auxiliary agent in coating processes process, is intended to improve processing characteristics.The patent No. is CN102453163A's " preparation method of propene polymer and the propene polymer of being prepared by the method " patent, is suitable for coating material, at present still in the research trial stage although mention the prepared propene polymer of this technology.The product of " a kind of polyethylene composition for woven bag coating material and preparation method thereof " the patent manufacture that is CN102050981A according to the patent No. has excellent processing rheological property, coating width is wider, shrinkage amplitude is little, but goods deflection is poor, and cost is high.The patent No. is CN1312342's " block copolymerized polypropylene paint " patent, and this invention product is block copolymerized polypropylene paint, is applicable to that Polywoven Bag coating on inner surface, paper are compound, Film laminated etc., the feature of this coating material is that ethylene content is high, toughness, low-temperature performance are good, long service life, and complete processing is simple, coating process is stable, processing temperature is low, energy-conservation etc., still, because production cost is high, the deflection of filming is poor, existing market user is less.
Summary of the invention
The polypropylene that the object of the invention is to develop a kind of high comprehensive performance is coated with special material coated.First according to certain formulating of recipe, make polypropylene, polyethylene cross-linking agent, this cross-linking agent carries out blend by a certain percentage with EVA again, makes high fondant-strength properties-correcting agent.Then at polypropylene, carry out by screw rod scale, according to the ratio of 5%-10%, adding high fondant-strength properties-correcting agent in controllable rheology technological process, through blend, melting, extrude, granulation, blending, packaging and other steps produce modified polypropene and be coated with special material coated.
The technical solution used in the present invention is: the one, 50%-70%(is heavy) homo-polypropylene powder and 30%-50%(weight) Low Density Polyethylene blend even, then add the 0.6%-1.5%(heavy) linking agent, each section of temperature of forcing machine is controlled between 185 ℃-265 ℃, carries out basic granulation and prepares cross-linking agent.The 2nd, by cross-linking agent and EVA by 50 parts (weights): 50 parts (weights) mix, and each section of temperature of forcing machine is controlled between 190 ℃-250 ℃, and last extruding pelletization is made high fondant-strength properties-correcting agent.The 3rd, during granulation, high fondant-strength properties-correcting agent is heavy by the 5%-10%(of homo-polypropylene raw material by screw rod scale) set(ting)value accurately add; and add molecular weight regulator-di-t-butyl peroxide (DTBP) etc.; regulate its add-on to control the modified polypropene of finally making and be coated with special material coated MFR; by controlling each section of temperature of forcing machine, thereby being coated with to special material coated melting index, the modified polypropene of tablets press outlet is controlled within the scope of 32 ± 1g/10min again.
Homo-polypropylene of the present invention: the powder that its melt flow rate (MFR) is 2.0-4.5g/10min, its powder ash control is in 80ppm.
Low Density Polyethylene of the present invention: be the long-branch-chain polyethylene that high pressure vapor method is produced, density is between 0.919-0.923g/cm3, and its melt flow rate (MFR) is between 1.8-3.2g/10min.
Linking agent of the present invention: dicumyl peroxide (DCP), tert butyl peroxy benzoate (TBPB) or dibenzoyl peroxide (BP).
Ethylene-vinyl acetate copolymer of the present invention (EVA): require VA content to be not less than 18%.
The present invention is coated with when special material coated preparing modified polypropene by extruding pelletization, and each section of temperature controlling range of forcing machine used is:
First paragraph is controlled temperature: 180--245 ℃;
Second segment is controlled temperature: 190--240 ℃;
Control temperature: 190--250 ℃ for the 3rd section;
Control temperature: 180--220 ℃ for the 4th section;
Control temperature: 80--120 ℃ for the 5th section.
Embodiment
Step 1: the Low Density Polyethylene 100kg that polypropylene powder 100kg, the MFR that gets MFR and be 2.8g/10min is 2.0g/10min and the dicumyl peroxide of 2.0kg mix, and carry out granulation with twin screw extruder.During granulation, each section of forcing machine controlled temperature feed end and is respectively 200 ℃ of district's temperature 180 ℃, bis-district's temperature 195 ℃, tri-district's temperature 200 ℃, tetra-district's temperature 200 ℃, five district's temperature to discharge port, turn/min of screw speed 120, through water ring die face cutting, makes cross-linking agent.Step 2: get above-mentioned cross-linking agent 50kg and dry and ethylene-vinyl acetate copolymer 50kg blend granulation, during granulation, each section of forcing machine controlled temperature and from feed end to discharge port, is respectively 200 ℃ of district's temperature 170 ℃, bis-district's temperature 185 ℃, tri-district's temperature 220 ℃, tetra-district's temperature 220 ℃, five district's temperature, the dry high fondant-strength properties-correcting agent of making after pelletizing.Step 3: high fondant-strength properties-correcting agent is heavy by 5.0%() add-on joins in the homo-polypropylene powder of melt flow rate (MFR) for 2.78g/10min and mixes and carry out granulation; during granulation, add molecular weight regulator-di-t-butyl peroxide (DTBP); regulate its add-on to make the modified polypropene of finally making be coated with special material coated MFR=32 ± 1.0g/10min, tablets press temperature is controlled and is: 232 ℃, 200 195 228 228 ℃, 5th district, ℃, 4th district, ℃, 3rd district, ℃, 2nd district, a district.Thereby making modified polypropene is coated with special material coated.
The modified polypropene painting of making is special material coated for woven bag coating, and result is that peeling force is strong, coating speed reaches 180m/min, coating grammes per square metre 6.1g/m
3; For Instant noodle bag, apply, coating grammes per square metre reaches 28g/m
3, coat-thickness is even, and middle sealing strength is met consumers' demand completely.
Claims (7)
1. a modified polypropene is coated with special material coated production technique, it is characterized in that: by following three steps, manufacture modified polypropene coating material, step 1: the Low Density Polyethylene blend of the homo-polypropylene powder of weight percent 50%-70% and weight percent 30%-50% is evenly become to mixture 1, then in mixture 1, add the linking agent blend of weight percent 0.6%-1.5% evenly to become mixture 2, mixture 2 is carried out to basic granulation and prepare cross-linking agent; Step 2: by cross-linking agent and EVA by weight 50:50 mix and become mixture 3, each section of temperature of forcing machine is controlled between 190 ℃-250 ℃, mixture 3 carried out to extruding pelletization and make properties-correcting agent; Step 3: adding weight percent by screw rod scale in polypropylene powder is the properties-correcting agent of 5%-10%; during granulation, add molecular weight regulator; regulate its add-on to control the modified polypropene of finally making and be coated with special material coated MFR; again by controlling each section of temperature of forcing machine, the melting index of tablets press outlet pellet is controlled at 32 ± 1g/10min within the scope of and to become modified polypropene painting special material coated the most at last.
2. the production technique of modified polypropene coating material according to claim 1, it is characterized in that: the homo-polypropylene properties of powder index adopting in three steps of modified polypropene coating material production technique is, melt flow rate (MFR) is 2.0-4.5g/10min, and degree of isotacticity is controlled at 96% left and right.
3. the production technique of modified polypropene coating material according to claim 1, it is characterized in that: the long-chain branch Low Density Polyethylene performance index that adopt in the step 1 of modified polypropene coating material production technique are, melt flow rate (MFR) is between 1.8-3.2g/10min, and density is at 0.919-0.923g/cm
3between.
4. the production technique of modified polypropene coating material according to claim 1, it is characterized in that: in the step 3 of modified polypropene coating material production technique, adopt five sections of temperature control forcing machines, from forcing machine feed end, to each section of temperature controlling range of discharge port, be: first paragraph is controlled temperature: 180--245 ℃, second segment is controlled temperature: 190--240 ℃, control temperature: 190--250 ℃ for the 3rd section, control temperature: 180--220 ℃ for the 4th section, control temperature: 80--120 ℃ for the 5th section.
5. the production technique of modified polypropene coating material according to claim 1, is characterized in that: the EVA performance index of using in step 2 are that VA content is not less than 18%.
6. the production technique of modified polypropene coating material according to claim 1, is characterized in that: the linking agent using in step 1 is dicumyl peroxide (DCP), tert butyl peroxy benzoate (TBPB) or dibenzoyl peroxide (BP).
7. the production technique of modified polypropene coating material according to claim 1, it is characterized in that: the molecular weight regulator using in step 3 is di-t-butyl peroxide (DTBP), 2,5-2，5-dimethyl-2，5-di(t-butyl peroxy)2，5-hexane (DMDBH) or two (peroxidation sec.-propyl) benzene (BPIB).
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| CN201310518972.5A CN103524880A (en) | 2013-10-29 | 2013-10-29 | Production process for special modified polypropylene coating material |
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| CN201310518972.5A CN103524880A (en) | 2013-10-29 | 2013-10-29 | Production process for special modified polypropylene coating material |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104231444A (en) * | 2014-10-14 | 2014-12-24 | 石狮市星港塑胶包装有限公司 | Coating formula for coated non-woven fabric |
| CN106221384A (en) * | 2016-08-25 | 2016-12-14 | 陕西聚能塑胶有限公司 | A kind of polypropylene painting is special material coated and preparation method thereof |
| CN106366904A (en) * | 2016-11-01 | 2017-02-01 | 福州展辰新材料有限公司 | Primer paint composition |
| CN107201092A (en) * | 2017-07-24 | 2017-09-26 | 谢泳江 | A kind of preparation method of epoxidation crosslinked polypropylene powdery paints |
| CN108014986A (en) * | 2017-12-25 | 2018-05-11 | 安徽省临泉县万隆塑料包装有限公司 | A kind of internal coat technique of Polywoven Bag |
| CN110684260A (en) * | 2019-08-26 | 2020-01-14 | 深圳市鑫昌龙新材料研究所有限公司 | Polyethylene melt flow rate regulator and preparation method thereof |
| CN111440384A (en) * | 2020-05-25 | 2020-07-24 | 南京金陵塑胶化工有限公司 | Coating-grade co-polypropylene and preparation method thereof |
| CN114541149A (en) * | 2022-02-18 | 2022-05-27 | 江西亚美达环保再生资源股份有限公司 | Method for preparing polypropylene coating material by using polypropylene lunch box recycled material |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104231444A (en) * | 2014-10-14 | 2014-12-24 | 石狮市星港塑胶包装有限公司 | Coating formula for coated non-woven fabric |
| CN106221384A (en) * | 2016-08-25 | 2016-12-14 | 陕西聚能塑胶有限公司 | A kind of polypropylene painting is special material coated and preparation method thereof |
| CN106366904A (en) * | 2016-11-01 | 2017-02-01 | 福州展辰新材料有限公司 | Primer paint composition |
| CN107201092A (en) * | 2017-07-24 | 2017-09-26 | 谢泳江 | A kind of preparation method of epoxidation crosslinked polypropylene powdery paints |
| CN108014986A (en) * | 2017-12-25 | 2018-05-11 | 安徽省临泉县万隆塑料包装有限公司 | A kind of internal coat technique of Polywoven Bag |
| CN110684260A (en) * | 2019-08-26 | 2020-01-14 | 深圳市鑫昌龙新材料研究所有限公司 | Polyethylene melt flow rate regulator and preparation method thereof |
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| CN111440384A (en) * | 2020-05-25 | 2020-07-24 | 南京金陵塑胶化工有限公司 | Coating-grade co-polypropylene and preparation method thereof |
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