CN100569818C - A kind of method that improves melt strength of polypropylene - Google Patents
A kind of method that improves melt strength of polypropylene Download PDFInfo
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- CN100569818C CN100569818C CNB2008100504347A CN200810050434A CN100569818C CN 100569818 C CN100569818 C CN 100569818C CN B2008100504347 A CNB2008100504347 A CN B2008100504347A CN 200810050434 A CN200810050434 A CN 200810050434A CN 100569818 C CN100569818 C CN 100569818C
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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
-
- 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
-
- 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
- B29C2948/92561—Time, e.g. start, termination, duration or interruption
-
- 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
Abstract
The present invention adopts the radical initiator melting mixing of the reversible stablizer of free radical of the comonomer of the polypropylene of 100 weight parts and 0.1-10 weight part, 0.001-5 weight part and 0.001-2 weight part reacted and improves polyacrylic melt strength.Wherein the reversible stablizer of free radical is the dithio formate compounds.The dithio formic acid group that the reversible stablizer of free radical produces under reaction conditions can be stablized the polypropylene macromolecular radical by reversing process, its result can suppress the chain rupture of polymkeric substance effectively, promote the generation of graft reaction, another split product then is a carbon radicals, it can obtain macromolecular radical by the activated polymer macromole, thereby reduces the consumption of radical initiator.
Description
Technical field
The present invention relates to a kind of method that improves melt strength of polypropylene.
Background technology
Polypropylene (PP) is as a kind of thermoplastic macromolecule material of excellent property, have density little, nontoxic, be easy to characteristics such as machine-shaping, product high comprehensive performance, application is very extensive at aspects such as automobile, household electrical appliance, electronics, packing and building materials, has become kind with fastest developing speed in the resins for universal use.Although PP has many good qualities, but because the inherent characteristics of propylene polycoordination reaction, carry out the PP that propylene polymerization mostly obtains linear structure with Ziegler-Natta catalyst and metallocene catalyst, and linear PP melt strength under molten state is low, when extensional flow, melt can not show strain hardening effect, directly cause PP some defectives when melt-processed, comprise edge curl and contraction when high speed is extrusion coated, occur molten hanging down and local attenuation when thermoforming, abscess subsides etc. when fluid flow instability and extrusion foaming when the co-extrusion of multilayered structure.Improving at present melt strength of polypropylene mainly realizes by following approach: (1) in the polymerization process of resin or the polymerization later stage carry out graft reaction, on main polymer chain, introduce the side chain of length; (2) carry out non-reacted blending and modifying, in matrix polymer, introduce other components of high relative molecular weight; (3) directly polymkeric substance is carried out reaction modifyings such as controlled grafting, crosslinked and degraded.In aforesaid method, the grafting long-chain branch is the most remarkable to the influence of the melt strength of polymkeric substance on main polymer chain, and directly polymkeric substance is carried out reaction modifying ratios such as controlled grafting, crosslinked and degraded and be easier to implement, the method for employing mainly contains: (1) does not have direct radiation that comonomer participates in or reaction to extrude to carry out the long chain branching modification; (2) carry out controlled crosslinked, graft modification by adding multi-functional monomer, vinyl silanes or vinylbenzene.
Early 1990s, Himont company (CN86100791A, CN1105033A, EP190889) adopts radiation polypropylene generation free radical in cryogenic vacuum or the nitrogen, the grafting that heats up then, the technology of final high temperature deactivation, successfully obtain long-chain branching polypropylene, and obtained commercial applications.1996, Borealis company successfully developed high temperature polypropylene long chain branching technology.Akzo Nobel (the WO9749759 of company; WO9927007) under nitrogen protection;, extrude by reaction and to obtain long-chain branching polypropylene as initiator with the peroxy dicarbonates compound, but when obtaining high branching content, follow more gel structure.These two kinds of methods are had relatively high expectations to technical qualification.In order to suppress the chain-scission degradation of polymkeric substance in the free radical reaction modification, can add to have the comonomer of two keys, make itself and macromolecular radical reaction generate comparatively stabilized radical.This method simply comes into one's own owing to technology.China application patent of invention CN200610163256.X and CN200610163256 employing direct heat cause and improve polyacrylic melt strength.Wang xiaochun (Journal of Applied Polymer Science, 1996, Vol.61,1395-1404) and D.Graebling (Journal of AppliedPolymer Science, 1996, Vol.66 is 809-918) by adding comonomer, cause polyacrylic melting graft reaction by superoxide, improve polyacrylic melt strength.Chinese patent CN143259A has also announced similar method.China applies for a patent CN200710062451 and has further added organic modified sheet silicate again and prepared foamable polypropylene modification thing.D.Graebling further introduces thiuram compound and controls graft reaction in its patent US5569717.China applies for a patent CN200510117710 and also discloses similar method.The structure of thiurams is as follows:
Wherein X is 1 or 2, R
1, R
2, R
3And R
4Alkyl or aryl for C atomicity 1-10.When patent US5569717 pointed out X=2, effect was better.But from above structure as can be seen, have only single free radical stabilising functional group in its molecule, so need to add a certain amount of radical initiator.
Summary of the invention
The purpose of this invention is to provide a kind of method that improves melt strength of polypropylene.
The present invention adopts at high temperature has stabilization to polypropylene tertiary carbon free radical, and the reversible stablizer of free radical that can reversible release macromolecular radical, regulates and control polypropylene grafted reaction, to improve polyacrylic melt strength.
The step and the condition that the invention provides a kind of method that improves melt strength of polypropylene are as follows:
Polypropylene and the comonomer of 0.1-10 weight part, the reversible stablizer of free radical of 0.001-5 weight part and the radical initiator of 0.001-2 weight part of 100 weight parts are carried out proportioning, polypropylene is joined in the 170-210 ℃ of Banbury mixer, after treating polypropylene fusion, add comonomer and the reversible stablizer of free radical, add radical initiator behind the mixing, be mixed to moment of torsion discharging when constant; Or
Proportioning by weight will join after polypropylene, comonomer, the reversible stablizer of free radical and the initiator pre-mixing in 170-230 ℃ the twin screw extruder, and controlling reaction time is 30 seconds-10 minutes, and hybrid reaction is extruded under the molten state;
Described polypropylene is selected from homo-polypropylene, Co-polypropylene or both mixtures;
Described comonomer is: one or more in trimethylolpropane trimethacrylate (TMPTMA), Viscoat 295 (TMPTA), pentaerythritol triacrylate (PETA), diethylene glycol diacrylate (DEGDA), 1,4 butanediol diacrylate (BDDA), propylene glycol diacrylate (DPGDA), octadecyl acrylate (SA) and the polyethyleneglycol diacrylate (PEGDA);
The reversible stablizer of free radical is the compound of following structure:
In the formula, R
1Be phenyl or imido grpup; R
2Be C
1-C
4Alkyl, cyclohexyl, benzyl, 1-methyl isophthalic acid-phenylmethylene, 1-(ethoxy carbonyl)-1-ethyl or 2-(ethoxy carbonyl)-2-propyl group; Or the mixture of two or more compositions in the above compound;
Described radical initiator is dicumyl peroxide (DCP), tertbutyl peroxide (TBHP), hydrogen phosphide cumene (CHP), two (tert-butyl peroxide) diisopropylbenzene(DIPB) (BPIB), 2,5-dimethyl-2, two (tert-butyl hydroperoxide) hexanes (BPDH) of 5-, ditertiary butyl peroxide (DTBP), 2,5-dimethyl-2, two (tert-butyl hydroperoxide) hexins-3 (DYBP) of 5-, one or more of azo diisopropylamidinateand azoles quinoline hydrochloride (AIBI) or azo-bis-isobutyrate hydrochloride (AIBA); Described radical initiator is 5 seconds-10 minutes 170-230 ℃ of half-life.
Beneficial effect of the present invention: 1. the present invention adopts the dithio formate compounds as the reversible stablizer of free radical, dithio formic acid group after its cracking has the effect of reversible stable polypropylene macromolecular radical, suppress the β chain rupture of polymkeric substance effectively, promote the generation of graft reaction, effectively improve polyacrylic melt strength.
2. adopt technical scheme of the present invention to obtain polypropylene, possess the rheological properties of long-chain branching polypropylene, when improving melt strength of polypropylene, do not produce gel.
3. the reversible stablizer of free radical that adopts of the present invention is when cracking goes out the dithio formic acid group of reversible stable polypropylene macromolecular radical, and another is the carbon radicals that can the activated polymer macromole produces macromolecular radical.That is to say that this molecule not only plays the effect of stabilized radical in reaction, and play the function of initiation reaction, can reduce the consumption that adds radical initiator, thereby further reduce the degraded of polymkeric substance, make when improving polypropylene entire body intensity, effectively reduce the loss of material aspect mechanical property.
Embodiment
(230 ℃, L/D=20/2, acceleration are 27mm/s to melt strength employing RHEOTENS 71.97 melt strength determinators in following examples
2) measure.The melt index determination condition is: 230 ℃, and 2.16kg.
Compound that embodiments of the invention are used and structure thereof: (1), piperidines-1-dithio ethyl formate, (2), piperidines-1-dithio propyl formate, (3), piperidines-1-dithio formic acid cyclohexyl ester, (4), piperidines-1-dithio formic acid benzyl ester, (5), pyrroles-1-dithio propyl formate, (6), dimethyl amido dithio formic acid-1-phenylethyl 7,7, diethyl amido dithio n-buty formate, (8), diethyl amido dithio formic acid-2-ethoxycarbonyl propyl-2-ester, (9), dimethyl amido dithio formic acid-1-ethoxy carbonyl ethyl ester, (10), the dithiobenzoic acid benzyl ester, (11), the basic ester of dithiobenzoic acid-2-(2 Methylpropionic acid ethyl ester), (12), phenylbenzene amido dithio ethyl formate, (13), phenylbenzene amido dithio methyl-formiate, (14), carbazole-9-dithio formic acid benzyl ester and (15), carbazole-basic the ester of 9-dithio formic acid-2-(2 Methylpropionic acid ethyl ester).The structural formula of these compounds is as follows:
Embodiment 1 (Comparative Examples)
The polypropylene (melting index is 2.28g/10min for homo-polypropylene, powder) of 100 weight parts is added in 180 ℃ of Banbury mixeies, and mixing 10 minutes, obtaining polyacrylic melt strength was 2.5cN.
Embodiment 2 (Comparative Examples)
Polypropylene used among the 100 weight part embodiment 1 is added in 180 ℃ of Banbury mixeies, add the TMPTMA of 1 weight part behind the fusion plastification, mixing condition is with embodiment 1.Obtaining polyacrylic melt strength is 4cN.
Embodiment 3 (Comparative Examples)
Polypropylene used among the 100 weight part embodiment 1 is added in 180 ℃ of Banbury mixeies, add the TMPTMA of 1 weight part behind the fusion plastification, add the BPDH of 0.2 weight part behind the mixing, mixing condition is with embodiment 1, and moment of torsion is constant, discharging.Obtaining polyacrylic melt strength is 5.3cN.
Embodiment 4 (Comparative Examples)
Polypropylene used among the 100 weight part embodiment 1 is added in 180 ℃ of Banbury mixeies, add the TMPTMA of 1 weight part and the Thiuram disulphide (TETD) (molecular weight 296.5) of 0.3 weight part behind the fusion plastification, the BPDH that adds 0.2 weight part behind the mixing, mixing condition is with embodiment 1, moment of torsion is constant, discharging.Obtaining polyacrylic melt strength is 23cN.
Embodiment 5
Polypropylene used among the 100 weight part embodiment 1 is added in 180 ℃ of Banbury mixeies, add the TMPTMA of 1 weight part and the compound (7) (molecular weight is 208) of 0.42 weight part behind the fusion plastification, add the BPDH of 0.1 weight part behind the mixing, mixing condition is with embodiment 1, moment of torsion is constant, discharging.Obtaining polyacrylic melt strength is 29cN.
Embodiment 6
Polypropylene used among the 100 weight part embodiment 1 is added in 180 ℃ of Banbury mixeies, add the TMPTMA of 1 weight part and the compound (7) (molecular weight is 208) of 0.42 weight part behind the fusion plastification, mixing condition is with embodiment 1, and moment of torsion is constant, discharging.Obtaining polyacrylic melt strength is 7cN.
Comparative example 1-6, the reversible stablizer of free radical that adds in the technology that improves melt strength of polypropylene can partly replace radical initiator as can be seen, promptly adopt the reversible stablizer of free radical can reduce the consumption of radical initiator, thereby suppress because the excessive polymkeric substance excessive degradation that causes of initiator number of free radical.Wherein embodiment 4 and 5 results are as can be seen, keep under the situation of dithio formic acid group same concentrations, adopt the reversible stablizer of free radical, the polyacrylic melt strength that obtains under the condition of low free radical initiator concentration is a little more than the thiuram compound and the polyacrylic melt strength of high radical initiator concentration system gained of simple function.Embodiment 2 and the reversible stablizer of this free radical of 6 comparative illustration can play the part action of free radical initiator.
Embodiment 7
Polypropylene (homo-polypropylene with 100 weight parts, pellet, melting index 2.6g/10min, melt strength is 2.7cN) add in 200 ℃ of Banbury mixeies, add PETA, the TMPTA of 0.1 weight part of 5 weight parts and the compound (1) of 5 weight parts behind the fusion plastification, the DCP that adds 1 weight part behind the mixing, mixing 5 minutes, the constant discharging of moment of torsion.Obtaining polyacrylic melt strength is 33cN.
Embodiment 8
Polypropylene used among the 100 weight part embodiment 1 is added in 210 ℃ of Banbury mixeies, add the TMPTA of 0.1 weight part and the compound (2) of 0.001 weight part behind the fusion plastification, add the BPIB of 0.001 weight part behind the mixing, mixing 9 minutes, the constant discharging of moment of torsion.Obtaining polyacrylic melt strength is 18cN.
Embodiment 9
Polypropylene (Co-polypropylene with 100 weight parts, ethylene content 10% (weight ratio), melting index is 0.9g/10min, melt strength is 3.4cN) add in 175 ℃ of Banbury mixeies, DEGDA, the SA of 1 weight part, the compound (3) of 0.1 weight part, the compound (7) of 0.5 weight part and the compound (9) of 0.2 weight part that add 2.5 weight parts behind the fusion plastification, the TBHP that adds 0.5 weight part behind the mixing, mixing 7 minutes, the constant discharging of moment of torsion.Obtaining polyacrylic melt strength is 29cN.
Embodiment 10
Polypropylene used among the 100 weight part embodiment 7 is added in 195 ℃ of Banbury mixeies, add the BDDA of 7 weight parts and the compound (4) of 3 weight parts behind the fusion plastification, add the CHP of 2 weight parts behind the mixing, mixing 6 minutes, the constant discharging of moment of torsion.Obtaining polyacrylic melt strength is 32cN.
Embodiment 11
Polypropylene used among the 100 weight part embodiment 9 is added in 205 ℃ of Banbury mixeies, add the DPGDA of 2 weight parts and the compound (5) of 0.5 weight part behind the fusion plastification, add the DYBP of 0.5 weight part behind the mixing, mixing 4 minutes, the constant discharging of moment of torsion.Obtaining polyacrylic melt strength is 28cN.
Embodiment 12
Join in the twin screw extruder after the DCP of the AIBI of the compound (6) of the TMPTA of the SA of polypropylene used among polypropylene used among the 50 weight part embodiment 7, the 50 weight part embodiment 9,8 weight parts, 2 weight parts, 1 weight part, 0.2 weight part and 0.3 weight part mixed, wherein the four section temperature of forcing machine from the charging opening to the discharge port are respectively 175 ℃, 190 ℃, 200 ℃ and 205 ℃, hybrid reaction is extruded under the molten state, and controlling reaction time is 30 seconds.Obtaining polyacrylic melt strength is 27cN.
Embodiment 13
The PEGDA of polypropylene used among polypropylene used among the 10 weight part embodiment 1, the 90 weight part embodiment 9,5 weight parts, the SA of 5 weight parts, the compound (8) of 0.1 weight part and the AIBA of 0.4 weight part are mixed in the back adding twin screw extruder, wherein the four section temperature of forcing machine from the charging opening to the discharge port are respectively 170 ℃, 180 ℃, 190 ℃ and 195 ℃, hybrid reaction is extruded under the molten state, and controlling reaction time is 10 minutes.Obtaining polyacrylic melt strength is 29cN.
Embodiment 14
Join in the twin screw extruder after the CHD of the compound (9) of the TMPTMA of polypropylene used among polypropylene used among the 80 weight part embodiment 9, the 20 weight part embodiment 1,5 weight parts, 1 weight part and 2 weight parts mixed, wherein the four section temperature of forcing machine from the charging opening to the discharge port are respectively 190 ℃, 200 ℃, 220 ℃ and 230 ℃, hybrid reaction is extruded under the molten state, and controlling reaction time is 3 minutes.Obtaining polyacrylic melt strength is 25cN.
Embodiment 15
Join after the DTBP of the compound (10) of the BDDA of polypropylene used among polypropylene used among the 95 weight part embodiment 7, the 5 weight part embodiment 9,5.2 weight parts, 1 weight part and 2 weight parts mixed in the twin screw extruder with embodiment 14 uniform temps, hybrid reaction is extruded under the molten state, and controlling reaction time is 8 minutes.Obtaining polyacrylic melt strength is 30cN.
Embodiment 16
With 100 weight part polypropylene (Co-polypropylene, ethylene content 7% (weight ratio), melting index is 1.2g/10min, melt strength is 3.0cN) add in 190 ℃ of Banbury mixeies, add the TMPTA of 0.1 weight part and the compound (11) of 0.001 weight part behind the fusion plastification, the BPIB that adds 0.001 weight part behind the mixing, mixing 3.5 minutes, the constant discharging of moment of torsion.Obtaining polyacrylic melt strength is 18cN.
Embodiment 17
With 100 weight part polypropylene (Co-polypropylene, ethylene content 12% (weight ratio), melting index is 1.0g/10min, melt strength is 2.9cN) add in 170 ℃ of Banbury mixeies, add the DEGDA of 2.3 weight parts and the compound (12) of 0.1 weight part behind the fusion plastification, the BPIB that adds 0.5 weight part behind the mixing, mixing 10 minutes, the constant discharging of moment of torsion.Obtaining polyacrylic melt strength is 21cN.
Embodiment 18
Polypropylene used among the 100 weight part embodiment 17 is added in 180 ℃ of Banbury mixeies, add the TMPTA of 0.15 weight part and the compound (13) of 0.001 weight part behind the fusion plastification, the DYBP that adds 0.001 weight part behind the mixing, mixing 9 minutes, the constant discharging of moment of torsion.Obtaining polyacrylic melt strength is 19cN.
Embodiment 19
Polypropylene used among the 100 weight part embodiment 16 is added in 200 ℃ of Banbury mixeies, add the PETA of 3.5 weight parts and the compound (14) of 0.2 weight part behind the fusion plastification, add the TBHP of 0.5 weight part behind the mixing, mixing 5 minutes, the constant discharging of moment of torsion.Obtaining polyacrylic melt strength is 23cN.
Embodiment 20
Join after the DTBP of the compound (9) of the compound (15) of the TMPTA of polypropylene used among the 100 weight part embodiment 17,5 weight parts, 0.2 weight part, 0.3 weight part and 1.5 weight parts mixed in the twin screw extruder with embodiment 14 uniform temps, hybrid reaction is extruded under the molten state, and controlling reaction time is 3 minutes.Obtaining polyacrylic melt strength is 25cN.
Claims (1)
1, a kind of method that improves melt strength of polypropylene is characterized in that step and condition are as follows:
Polypropylene and the comonomer of 0.1-10 weight part, the reversible stablizer of free radical of 0.001-5 weight part and the radical initiator of 0.001-2 weight part of 100 weight parts are carried out proportioning, polypropylene is joined in the 170-210 ℃ of Banbury mixer, after treating polypropylene fusion, add comonomer and the reversible stablizer of free radical, add radical initiator behind the mixing, be mixed to moment of torsion discharging when constant; Or
By above-mentioned parts by weight proportioning, will join after polypropylene, comonomer, the reversible stablizer of free radical and the initiator pre-mixing in 170-230 ℃ the twin screw extruder, controlling reaction time is 30 seconds-10 minutes, hybrid reaction is extruded under the molten state;
Described polypropylene is selected from homo-polypropylene, Co-polypropylene or both mixtures;
Described comonomer is: one or more in trimethylolpropane trimethacrylate, Viscoat 295, pentaerythritol triacrylate, diethylene glycol diacrylate, 1,4 butanediol diacrylate, propylene glycol diacrylate, octadecyl acrylate and the polyethyleneglycol diacrylate;
The reversible stablizer of free radical is the compound of following structure:
In the formula, R
1Be phenyl or imido grpup; R
2Be C
1-C
4Alkyl, cyclohexyl, benzyl, 1-methyl isophthalic acid-phenylmethylene, 1-(ethoxy carbonyl)-1-ethyl or 2-(ethoxy carbonyl)-2-propyl group; Or the mixture of two or more compositions in the above compound;
Described radical initiator is a dicumyl peroxide, tertbutyl peroxide, hydrogen phosphide cumene, two (tert-butyl peroxide) diisopropylbenzene(DIPB), 2,5-dimethyl-2, two (tert-butyl hydroperoxide) hexanes of 5-, ditertiary butyl peroxide, 2,5-dimethyl-2, two (tert-butyl hydroperoxide) hexins-3 of 5-, one or more of azo diisopropylamidinateand azoles quinoline hydrochloride or azo-bis-isobutyrate hydrochloride; Described radical initiator is 5 seconds-10 minutes 170-230 ℃ of half-life.
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| CN101376683B (en) * | 2008-10-07 | 2011-09-21 | 中国科学院长春应用化学研究所 | Preparation of high melt strength polypropylene |
| CN109749235B (en) * | 2018-12-19 | 2022-08-05 | 万华化学集团股份有限公司 | Reversible micro-crosslinked high-melt-strength polypropylene and preparation method thereof |
| CN113789027A (en) * | 2021-01-04 | 2021-12-14 | 海信（山东）冰箱有限公司 | Heat-resistant regenerated polypropylene material and preparation method thereof |
| CN113024737A (en) * | 2021-04-07 | 2021-06-25 | 贵州大学 | Method for compatibilization of polypropylene/polyethylene blend |
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| CN1962707A (en) * | 2005-11-07 | 2007-05-16 | 中国科学院化学研究所 | Branched polypropylene and its preparation method |
| CN101092500A (en) * | 2007-07-20 | 2007-12-26 | 唐山市福恩特防腐电气控制设备有限公司 | Polypropylene material with high bath strength and preparation method |
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