CN101456993A - Rheology-modified thermoplastic elastomer compositions for extruded profiles - Google Patents
Rheology-modified thermoplastic elastomer compositions for extruded profiles Download PDFInfo
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Abstract
Rheology-modified, gel-free thermoplastic elastomer compositions comprising a melt blend of an ethylene/alpha-olefin polymer and a high melting polymer such as polypropylene or a propylene/alpha-olefin copolymer wherein the rheology modification is induced by a combination of a peroxide and a free radical coagent in a peroxide:coagent ratio of 1:4 to 1:20 and a maximum peroxide concentration of 0.075 wt%. The resulting compositions have an elastomeric phase, a non-elastomeric phase and certain physical properties that exceed those of a like composition that is rheology-modified by perioxide alone or perioxide and coagent in a 1:2 to 2:1 ratio. The compositions are used to make a variety of articles of manufacture, such as tubing and weatherstripping, via calendaring, extrusion, and molding techniques such as blow molding.
Description
The application is that application number is 200380100850.9, and the applying date is on October 1st, 2003, and denomination of invention is divided an application for the Chinese patent application of " rheology-modified thermoplastic elastomer compositions that is used for extrudate ".
Technical field
Generality of the present invention relates to rheology-modified thermoplastic elastomer (TPE) composition, it comprises elastomeric ethylene/alpha (α)-alkene (EAO) polymkeric substance or EAO blend polymer and dystectic propene polymer, wherein two kinds of components are peroxide modified, with the preparation that relates to this component, said composition is being used to make extruding such as film, sheet and profiled material of goods, blowing, calendering, purposes in the technology of injection moulding and thermoforming operation and so on and relate to formed goods.The present invention relates to this based composition especially, wherein induce rheology modified by the unusual particular combination thing of specific ratios by what comprise low-level organo-peroxide and high-caliber free radical auxiliary agent, the method for preparing said composition, as physical blending thing by these components of modification, extruding with said composition, molding, the purposes in calendering and the thermoforming operation.
Background technology
People such as Heck have described rheology modified TPE composition in WO98/32795.This is rheology modified can (to comprise superoxide and radiation) by all means and induces.People's such as Heck composition allegedly demonstrates the comprehensive of four kinds of performances: shear shinning index (STI), melt strength (MS), temperature of solidification (ST) and upper limit use temperature (UST).People such as Heck use superoxide to carry out rheology modified to composition separately.People such as Heck instruct polymer composition to have at least 20, and preferably at least 25, more preferably at least 30 and more preferably at least 35 STI again.Use although these compositions can be used for some, as trolley part and startup axle, for extruding, molding and calendering are operated, and especially high speed operation still needs improved composition.
Walton has described in WO02/24803 and has been used to roll the rheology-modified compositions of operating with thermoforming.Said composition is described as comprising superoxide and the auxiliary agent of 1:10 to the 10L1 ratio with relative broad range, though in an embodiment, rheology modifiedly realizes to the superoxide and the auxiliary agent of 2:1 ratio with about 1:2 by using.(those of skill in the art will appreciate that integer defines this ratio by only using).The rheology-modified compositions of Walton demonstrates the melt toughness at least about 600cNmm/s, at least about 3MPa at the true ultimate tensile strength under 140 ℃ with at least about 400% the elongation at break under 140 ℃.The Walton composition can also have the gel that can measure, this for many extrude with other moulding technology be undesirable.Although these compositions can be used for some calendering operations, for extrude, molding and calendering operation still need improved composition, in these operations smooth surface, hang down smell, anti-collapse strength and high line speed and make us desireing.
Composition with smooth surface is to extrude, and molding and calendering are needed.It is particularly important that shape-holding property or anti-collapse strength are extruded for profiled material.Composition with low smell is that whole operations (comprise and extruding, molding and calendering) are needed, and can extrude with high line speed those especially make us desireing for extruding with blow molding operation.Smooth surface is exhilarating on aesthetic and is needed in order to obtain good seal performance sometimes, shape-holding property is to prevent to subside needed after extrudate leaves die head, is at utmost to reduce in manufacturing processed the workman to contact chemical residue needed with low smell. high line speed can change into improved productivity for manufacturers.
Have been found that surprisingly, by carrying out rheology modified to the TPE composition with low-level superoxide and high-caliber auxiliary agent (with respect to peroxide level), can produce composition, it can extrude and obtain to have the goods of excellent surface and odor property under very high linear velocity.
Summary of the invention
The applicant has been found that by at least a superoxide and at least a free radical auxiliary agent has material impact by the extrudability and the surface properties of interpolation realized the rheology modified blend at least a elastomerics EAO polymkeric substance or EAO blend polymer and polyolefine such as PP of specific ratios.From extruding of rheology-modified compositions manufacturing of the present invention, molding and calendered goods have improved surface properties, even under obviously higher throughput rate, with add superoxide or carry out rheology modified correspondent composition to the superoxide of 2:1 ratio with auxiliary agent by 1:2 and compare. after this manner, one aspect of the present invention is to comprise EAO polymkeric substance or EAO blend polymer and be selected from the rheology modified of high-melting-point polymer in homopolymer polypropylene and the propylene/ethylene copolymer, the TPE composition of gel-free, wherein composition is with the concentration based on the 0.005-0.075wt% of TPE composition by at least a superoxide, undertaken rheology modifiedly by the superoxide of 1:4 at least and auxiliary agent ratio with at least a free radical auxiliary agent, this rheology-modified compositions has @190 ℃ of the tan δ of 1.05-1.40 and the STI that (comprises end value) between 15 to 30.Can extrude with higher linear velocity from the mixture of rheology modification of polymers of the present invention preparation and to produce profiled material (profile), the latter have than from identical polymer manufacture but by superoxide only or carry out rheology modified profiled material by 1:2 to the superoxide of 2:1 ratio and auxiliary agent and have more slick surface.
A second aspect of the present invention is that preparation is rheology modified, the TPE method for compositions of gel-free, and this method comprises:
A) at least a superoxide and at least a free radical auxiliary agent are pressed the superoxide of 1:4 at least: the auxiliary agent ratio adds in the molten polymer blend of the high-melting-point polymer that comprises elastomeric ethylene/alpha-olefinic polymer and be selected from homopolymer polypropylene and propylene/ethylene copolymer; With
B) keep blend polymer under melted state and allow it experience those simultaneously to be enough to the rheology modified shearing condition that is dispersed in superoxide and auxiliary agent in the whole molten polymer blend and implements this polymkeric substance, enough rheology modified be by STI for the 15-30 of TPE composition, 1.05-1.40 tan δ and immeasurablel gel weigh. this method randomly comprise step c) wherein this rheology modified polymer blend change into goods, preferably not with the intermediate steps of rheology modified polymer blend as the solid recovery, yet then this solid is converted to the melted state that is enough to make these goods., if desired, optional this intermediate steps that comprises of this method.
An alternative of second aspect is that preparation is rheology modified, the TPE method for compositions of gel-free, and this method comprises:
A) before each component is by blend at least a superoxide and at least a free radical auxiliary agent are pressed the superoxide of 1:4 at least: the auxiliary agent ratio adds at least a component polymer of blend polymer, and these component polymer comprise elastomeric ethylene/alpha-olefinic polymer and are selected from the high-melting-point polymer of homopolymer polypropylene and propylene/ethylene copolymer;
B) these component polymer of blend; With
C) blend polymer is changed into molten polymer blend and allow this blend experience those simultaneously to be enough to the rheology modified shearing condition that is dispersed in superoxide and auxiliary agent in the whole molten polymer blend and implements this polymkeric substance, enough rheology modified be STI by 15-30, weigh for the tan δ of the 1.05-1.40 of TPE composition and immeasurablel gel.This method randomly comprise in succession step c) wherein this rheology modified polymer blend change into goods, the preferred intermediate steps that rheology modified polymer blend is not reclaimed as solid and then this solid is converted to the melted state that is enough to make these goods.Yet, if desired, optional this intermediate steps that comprises of this method.
Second alternative of second aspect is that preparation is rheology modified, the method for the thermoplastic elastomer goods of gel-free, and this method comprises:
A) at least a superoxide and at least a free radical auxiliary agent are pressed the superoxide of 1:4 at least: the auxiliary agent ratio adds in fusing elastomeric ethylene/alpha-olefinic polymer or the fusing elastomeric ethylene/alpha-olefin polymer blends to obtain rheology modified ethylene/alpha-olefin polymer or rheology modified ethylene/alpha-olefin polymer blends;
B) interpolation is selected from the high-melting-point polymer of homopolymer polypropylene and propylene/ethylene copolymer and forms the compound blend polymer in rheology modification of polymers or blend polymer; With
C) the compound blend polymer is changed into goods, these goods are when extruding, have when molding or rolling processing smooth surface.
A third aspect of the present invention is from least a its goods of component of having of TPE composition of the present invention manufacturing.Said composition allows to use the device of extruding and/or rolling easily to form goods.In related fields, before the manufacturing of goods, TPE composition of the present invention and another kind of polymkeric substance are preferred for making a kind of in those polymkeric substance of TPE composition, carry out blend.
Embodiment
Rheology-modified compositions of the present invention comprises elastomerics EAO polymkeric substance or EAO blend polymer and high-melting-point polymer. and composition makes us containing desirably have an appointment the EAO polymkeric substance of the about 90wt% of 60-or the high-melting-point polymer of EAO blend polymer and the about 10wt% of about 40-, and two percentage ratios are based on composition weight. and various amounts are through selecting to reach total 100wt% polymkeric substance.
For the present invention, the rheology modified composition that is meant has the STI of 15-30 and the tan δ of ℃ 1.05-1.40.
Be suitable for EAO polymkeric substance of the present invention (also being called " ethene polymers ") and comprise multipolymer (interpolymer) and diene modified multipolymer.Polymkeric substance for example comprises ethylene/propene (EP) multipolymer, ethylene/butylene (EB) multipolymer, ethylene/octene (EO) multipolymer and ethylene/propylene/diene hydrocarbon modification (EPDM) multipolymer. more specific example comprises extremely-low density linear polyethylene (ULDPE) (for example, the Attane that is made by The Dow Chemical Company
TM), the linear EAO multipolymer of the branching (Tamer that makes by Mitsui PetroChemicals CompanyLimited for example equably
TMWith the Exact that makes by Exxon Chemical Company
TM) and branching, substantial linear the equably EAO polymkeric substance (Affinity that obtains from The DowChemical Company for example
TMPolymkeric substance and the Engage that obtains from DuPont DowElastomers L.L.C
Polymkeric substance).Preferred EAO polymkeric substance is the ethylene copolymer of the linearity and the substantial linear of branching equably, and it has the about 0.92g/cm of about 0.85-
3, the about 0.90g/cm of especially about 0.85-
3Density (measuring) and about 0.01-according to ASTM D-792 about 30, preferably 0.05-10g/10 minute melt index or I
2(measuring) according to ASTMD-1238 (190 ℃/2.16kg load).
The ethylene copolymer of substantial linear or multipolymer (also being known as " SLEP ") they are especially preferred. in addition, various functional ethylene copolymers such as EVA (contain the about 50wt% of 0.5-that has an appointment from vinyl-acetic ester deutero-unit) they also are suitable.When using the EVA polymkeric substance, it is about 500 to have about 0.01-, preferably 0.05-50g/10 minute I
2Those be preferred.
" substantial linear " means polymkeric substance and has a kind of skeleton, and it is replaced by 0.01-3 long chain branches/per 1000 carbon in skeleton.
" long chain branching " or " LCB " referred to surpass a kind of chain length of chain length of the alpha-olefin component of EAO polymkeric substance or EAO blend polymer.If though length greater than six carbon atom, the actual quantity of carbon atom in the chain can not be distinguished or be determined to 13C nuclear magnetic resonance (C-13NMR) spectrum analysis, the existence of LCB can be from the molecular weight distribution determination of EAO polymkeric substance or is estimated at least.It is also from melt flow rate (MFR) (MFR) or the melt index (I that records according to ASTM D-1238 (190 ℃, 10kg heavy)
10) and I
2Ratio (I
10/ I
2) determine.
" multipolymer " at least two kinds of polymer of monomers that referred to polymerization therein.It comprises, for example, and multipolymer, terpolymer and tetrapolymer.It comprises especially by ethene and at least a comonomer typically having 3 to 20 carbon atom (C
3-C
20) alpha-olefin carry out the prepared polymkeric substance of polymerization. the alpha-olefin of giving an example comprises propylene, 1-butylene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene and vinylbenzene. it is C desirably that this alpha-olefin makes us
3-C
10Alpha-olefin.Preferred multipolymer comprises EP, EB, ethylene/hexene-1 (EH) and EO polymkeric substance.Terpolymer for example comprises ethylene/propylene/octene terpolymer and ethene, C
3-C
20Alpha-olefin and diolefine such as norbornadiene, dicyclopentadiene, 1,4-hexadiene, the terpolymer of piperylene or 5-ethylidene-2-norbornene.
" elastomerics () that here uses " refer to EAO polymkeric substance or EAO blend polymer, its density advantageously is lower than about 0.920g/cc, make us being lower than desirably about 0.900g/cc, preferably be lower than about 0.895g/cc, more preferably less than about 0.880g/cc, again more preferably less than about 0.875g/cc, even be lower than approximately 33% more preferably less than about 0.870g/cc and percent crystallinity, preferably be lower than about 29% and preferably measure by dsc (DSC) greater than about 0.850g/cc. percent crystallinity more preferably less than about 23%. these density.
SLEP embodies feature in narrow molecular weight distributions (MWD) and narrow short-chain branched distribution (SCBD) with can prepare described in 272 according at United States Patent (USP) (USP) 5,272,236 and 5,278, and both relevant portions are hereby incorporated by reference.This SLEP is because their narrow MWD and narrow SCBD demonstrate outstanding physicals together with long chain branching (LCB).
USP 5,272,236 (5 hurdles, 67 walk to 6 hurdles, 28 row) described and adopted continuous controlled fusion method, use at least one reactor, but allow to use a plurality of reactors, the SLEP production technique under polymerization temperature that is enough to produce SLEP and pressure with desired properties.Polyreaction preferably by using the constrained geometry catalysts technology, is carried out under 20 ℃ to 250 ℃ temperature via solution polymerization process. and suitable constrained geometry catalysts has been disclosed in USP5, and 272,236 6 hurdles 29 walk in 13 hurdles, 50 row.
Preferred SLEP has the characteristic of many uniquenesses, and one of them is between 20-90wt%, the more preferably ethylene content between 30-89wt%, and surplus comprises one or more comonomers.This ethene and co-monomer content are to be basic calculation and through selecting to reach the total monomer content of 100wt% with SLEP weight. for the chain length of six carbon atom at the most, the SLEP co-monomer content can be measured by using C-13 nmr analysis method.
The SLEP characteristic of additional uniqueness comprises I
2With MFR or I
10/ I
2This multipolymer makes us having 0.01-30g/10 minute desirably, more preferably 0.05-10g/10 minute I
2. this SLEP also has 〉=5.63, and is preferred 6.5 to 15, more preferably 7 to 10 I
10/ I
2(ASTMD-1238).For SLEP, I
10/ I
2Ratio is used as the indication of LCB degree, feasible bigger I
10/ I
2Ratio is equivalent in LCB degree higher in polymkeric substance.
The SLEP that satisfies above-mentioned standard comprises, for example, and the Engage that obtains from DuPont Dow Elastomers L.L.C.
Polyolefin elastomer and other polymkeric substance of producing by the constrained geometry catalysis method by The Dow Chemical Company and DuPont Dow Elastomers L.L.C.
The high-melting-point polymer component of TPE of the present invention is homopolymer or propylene and the alpha-olefin such as the ethene of propylene, 1-butylene, the blend of the multipolymer of 1-hexene or 4-methyl-1-pentene or homopolymer and multipolymer. homopolymer, each in the blend of multipolymer or homopolymer and multipolymer can nucleation.This alpha-olefin is ethene preferably.Multipolymer can be the blend of random copolymers or segmented copolymer or random copolymers and segmented copolymer.After this manner, this component preferably is selected from polypropylene (PP) homopolymer and propylene/ethylene copolymer.This component had 0.3-60g/10 minute, preferred 0.8-40g/10 minute and more preferably 1-35g/10 minute MFR. high-melting-point be defined as polymkeric substance and have fusing point between 130-165 ℃. it does not relate to MFR.
Here " nucleation " of Shi Yonging refers to by nucleator such as Millad
TMThe interpolation of (the dibenzyl Sorbitol Powder that is purchased from Milliken) is the polymkeric substance of modification.Other common nucleator also can use.
The preparation of polypropylene (PP) also involves the use of the binding substances of Z-type catalyst such as titanous chloride and diethyl monochlor(in)ate aluminium, as by Cecchin at USP 4,177, described in 160. the polymerization process that is used to produce PP comprises slurry process, it carries out under about 50-90 ℃ and 0.5-1.5MPa (5-15 normal atmosphere), with gas phase and liquid-monomer process, wherein extra concern must be arranged for removing of amorphous polymer.Ethene can be added in the reaction polypropylene .PP resin that has an ethylene block with formation and also can prepare together with their relevant technology by using any in various metalloceness, single site catalyst and the constrained geometry catalysts.
Superoxide is organo-peroxide preferably. and suitable organo-peroxide has the transformation period that has at least one hour under 120 ℃. and the superoxide of giving an example comprises and contains α, α '-bis(t-butylperoxy)-diisopropyl benzene and from Hercules, Inc. is with trade(brand)name VULCUP
TMThe a series of sulfurations and the polymerization agent that obtain, contain dicumyl peroxide and from llercules, Inc. is with trade(brand)name Di-cup
TMA series of these type of reagent that are purchased and by ElfAtochem, the Luperox that North America makes
TMSuperoxide or the Trigonox that makes by Akzo Nobel
TMOrgano-peroxide. this Lupersol
TMSuperoxide comprises Lupersol
TM101 (2, the 5-2), Lupersol
TM130 (2,5-dimethyl-2,5-two (t-butylperoxy) hexin-3) and Lupersol
TM575 (2,5-tert-pentyl peroxide-2-ethylhexanoate (hexonate)).Other suitable superoxide comprises 2,5-dimethyl-2,5-two-(t-butylperoxy) hexane, ditertiary butyl peroxide, two-(tert-pentyl) superoxide, 2,5-two (tert-pentyl peroxy)-2, the 5-dimethylhexane, 2,5-two-(t-butylperoxy)-2,5-phenylbenzene hexane, two (α-Jia Jibianji) superoxide, benzoyl peroxide, t-butylperoxyl benzoate, 3,6,9-triethyl-3,6,9-trimethylammonium-1,4,7-three peroxide nonane (triperoxonane) and bis(t-butylperoxy)-diisopropyl benzenes.
This superoxide is fit to about 0.075wt% or still less, more makes us about desirably 0.050wt% or amount still less and exist.Preferably, this superoxide is to exist with the amount in the about 0.075wt% scope of about 0.005-.This scope is more preferably about 0.05wt% of about 0.01-and the about 0.025wt% of 0.015-most preferably from about.All superoxide weight is based on elastomerics EAO polymkeric substance or blend polymer and high-melting-point polymer.The use of low peroxide concentrations will reduce the concentration of peroxide decomposition, and this is usually relevant with unpleasant odor, reduces the smell problem in final TPE composition.
This free radical auxiliary agent is to have monomer or the low-molecular weight polymer that free radical is had two or more functional groups of high response.Typically, these functional groups are methacrylic esters, allyl group or vinyl.The free radical auxiliary agent strengthens the rheology modified of this superoxide by two kinds of mechanism. and at first, utilize the allylic hydrogen abstraction from this auxiliary agent of peroxide-induced, produced the free radical long than low-energy state, life-span.This free radical can seize to induce branching in ethylene elastomer then by hydrogen. and since free radical than low-energy state, the difficult generation of the β-division of polypropylene or ethylene elastomer phase and disproportionation.Secondly, this multifunctional auxiliary agent can be as the bridged group between polymer chain.
The suitable free radical auxiliary agent that is used for this application comprises diallyl terephthalate, triallylcyanurate, cyanacrylate, 1,2 polyhutadiene, Vinylstyrene, trimethylolpropane trimethacrylate, polyethylene glycol dimethacrylate, Ethylene glycol dimethacrylate, pentaerythritol triacrylate, allyl methacrylate(AMA), two maleoyl N, N '--the phenylene imines, toluene bismaleimides-p-quininie dioxime, oil of mirbane, vulkacit D. preferred auxiliary agent is a triallylcyanurate, 1,2 polyhutadiene, Vinylstyrene, and trimethylolpropane trimethacrylate.
This auxiliary agent is fit to exist with the amount in about 0.025-1.0wt% scope. the about 0.5wt%. of the preferably about 0.05-of this scope
This superoxide and auxiliary agent ratio are suitably 1:4 to 1:20.The optimal ratio of auxiliary agent depends on employed ethylene/alpha-olefin in composition: polypropylene ratio.The OK range of the EAO:PP of percentage ratio meter is that the 60:40-90:10. preferred range is the 65:35-80:20 weight percentage by weight.
This superoxide and free radical auxiliary agent can be added by any usual way.The illustrative program comprises: before compound it is absorbed on the polymeric aggregate, when entering in the set composite, pellet it is joined in the polymeric aggregate as opening for feed at forcing machine, it is joined in the polymer melt in set composite such as Haake.Banbury mixing tank, Farrel continuous mixing device or Buss kneader or with it be injected in the forcing machine, with 100% activeconstituents (promptly, purified) or optional as at oil as dispersion in the treated oil or solution, in the moment that the forcing machine content has melted.Preferred program is before compound, superoxide and auxiliary agent is absorbed enter within the polymeric aggregate.
Has smooth surface and can be in order to produce at high linear velocity (150rpm at the most for example, on single screw rod (3/4 inch diameter) forcing machine of Brabender) under extrudate that extrude and that have excellent anti-collapse strength (collapse resistance), TPE composition of the present invention need have at the STI between 15 and 30 with at the tan δ under 190 ℃ between 1.05 and 1.40.If this peroxide level is that Tai Gao or superoxide and auxiliary agent ratio are low, then extrudate has rough surface and can not reasonably be extruded under the linear velocity.
Here the STI of Shi Yonging is under 190 ℃ common STI test temperature, at low shear rate (0.1 radian per second) polymer viscosity down of regulation divided by ratio at high shear rate (100 radian per second) polymer viscosity down of regulation. polymer viscosity is by using the dynamic mechanical spectrometer as RMS-800 or ARES from the Rheometrics acquisition, the shearing rate in 0.1-100 radian/per second (rad/sec) scope and measuring easily to moor (dyne-second/square centimeter (d-sec/cm2)) in nitrogen atmosphere under 190 ℃.STI mainly measures the flowability of polymkeric substance under various shearing conditions. and preferred, the STI of TPE composition of the present invention is 15-30.
Tan δ is a useful especially mutual relationship of investigating the processing characteristics of polymer composition of the present invention.Tan δ also is known as attenuation peak or dissipation factor, and it is defined as the ratio of modulus lost and storage modulus. and decay is the highstrung index of the molecular motion that takes place in material under solid-state and melt two states.It is relevant that this attenuation peak and little segmental when the gamma transition increase degree of freedom.Tan δ also demonstrates the peak when material enters into the viscosity flow zone, this moment the molecular interlocking effect can to ignore and hinder the unique factor of mobile be frictional force. this tan δ value is the unusual good index of equilibrated of estimating melt strength and flowability, resemble the ratio of sticky ingredient and elastic component in its definition. along with tan δ rises or becomes higher, this material is more to resemble fluid and along with tan δ step-down, this material has more elastic in nature.Can indicate blend polymer through a viscous flow zone and this value as this tan δ value of the function of the temperature under given shearing rate is that those skilled in the art are known to the temperature of work in-process and the susceptibility .tan δ of shearing rate, as at L.E.Nelson, MechanicalProperties of Polymers and Composites, the 1st volume, Marcel Dekker, Inc., define and describe in the 139-150 page or leaf (1974), it is hereby incorporated by reference. and preferred, the tan δ of TPE composition of the present invention is between 1.05 to 1.40 for 190 ℃.
For the present invention, tan δ measures by the Rubber Processing Analyzer RPA-2000 that obtains from Alpha that use has a double cone mouth mould design of no rotor, and the design of this mouthful mould contains the biconical 41.25mm diameter mouth mould in the mouth die slot crack with 0.487mm.Sample is to originate in 50 ℃ and end in 190 ℃ the temperature range and test under the frequency of 15% strain and 1.6Hz.Be recorded in the tan δ under 190 ℃.Therefore, be meant tan δ under 190 ℃ for whole fiducial values of tan δ value here.
Anti-collapse strength is special-shaped product keeps the ability of its shape after leaving the forcing machine die head a visual determination. for example, it must keep its original shapes and not subside or " sagging (sag) " when pipe leaves mouthful mould.
In order to have determined whether that insoluble gelifying agent is present in polymer composition such as the rheology-modified compositions of the present invention, said composition was soaked 12 hours in suitable solvent such as backflow dimethylbenzene, as at ASTM D 2765-90, described in the method B. any insoluble part of composition is separated then, drying and weighing, understanding with composition is that suitable correction is carried out on the basis. for example, the non-polymeric ingredients in the solvent was deducted and be insoluble to the weight that dissolves in the non-polymeric ingredients in the solvent from initial weight weight is deducted the initial and final weight from this.The insoluble polymkeric substance that is reclaimed is reported as percent gel content. for purpose of the present invention, " gel-free ", " formation of prevention insoluble polymer gel " and " immeasurablel gel " all refer to be lower than the gel content of limit of detection when using dimethylbenzene as solvent among the method B when at ASTM D 2765-90.
Composition of the present invention can be compound with any or multiple material that is added to usually in the polymkeric substance.These materials comprise, for example, do not carry out rheology modified EAO, treated oil, softening agent, dispersion agent, the special additive that comprises stablizer, filler (strengthening and non-enhancement type), whipping agent, and pigment. these materials can carry out before or after rheology modified compound with composition of the present invention in said composition. and those of skill in the art can easily select any suitable combination of these additives and the time of additive capacity and composition operation, need not too much experiment.
The processing finish usually is used to reduce the viscosity of composition, hardness, any in modulus and the cost. the most common treated oil has special ASTM (U.S.'s test and materialogy meeting) title, and this depends on whether they are classified as paraffinic hydrocarbons genus, naphthenic or aromatic oil.Those of ordinary skill in the manufacture field of general elastomerics of the present invention and rheology modified TPE composition will recognize that especially the oil of which kind is the most useful. when using, it is with greater than 0 desirably that this treated oil makes us, preferred about 0.5wt%, amount in about 50wt% scope exists, based on total composition weight.
Filler and toughener such as carbon black, glass, silica, metal carbonate such as lime carbonate, metal sulfate such as calcium sulfate, talcum, clay or graphite fibre; Typically be used for the TPE composition. when using, this filler is with greater than 0 to 70wt% ideally, and the amount existence in preferably about 0.5wt% to 40wt% scope is based on total composition weight.
Various special additives can be advantageously used in the composition of the present invention. and this additive comprises antioxidant, surface tension modifier, antiblocking agent, lubricant, biocide such as organic metallic compound, isothtazolones, organosulfur and mercaptan; Antioxidant such as resol, secondary amine, phosphorous acid ester and thioesters; Static inhibitor such as quaternary ammonium compound, amine and ethoxylation, propoxylation or glycerol compounds; Hydrolysis stabilizer; Lubricant such as lipid acid, Fatty Alcohol(C12-C14 and C12-C18), ester, fatty amide, metallic stearate, paraffin and Microcrystalline Wax, siloxanes and ortho-phosphoric acid ester; Releasing agent such as fine particle or pulverulent solids, soap, wax, siloxanes, hard ester acid esters of polyglycol and complex ester such as trimethylolpropane tris or pentaerythritol tetrastearate; Pigment, dyes and dyestuffs; The ester of softening agent such as diprotic acid (or their acid anhydrides) and monohydroxy-alcohol, as phthalic ester, adipic acid ester and benzoic ether; Thermo-stabilizer such as organo-tin mercaptide, the octyl group ester of Thiovanic acid and barium or cadmium carboxylate salt; UV light stabilizing agent, as bulky amine, neighbour-hydroxyl-phenyl benzotriazole, 2-hydroxyl, 4-alkoxy benzophenone, salicylate, cyanoacrylate, nickel chelate and benzylidene malonate and oxalic dianilide.Preferred obstruction phenol oxidation inhibitor is Irganox
TM1076 antioxidants can obtain from Ciba-Geigy Corp.
If use, each of above additive typically is no more than 45wt%, with based on total composition weight be the about 20wt% of about 0.001-ideally, and about 15wt% of preferably about 0.01-and the about 10wt%. of 0.1-more preferably from about
Rheology modified TPE composition of the present invention can be by any pipe that manufactures, parts, sheet or other form in the many usual procedures that use processing TPE.Composition also can shaping, spinning or stretching film forming, fiber, layer laminates or extrusion sheet or profiled material, or can with one or more organic or inorganic materials be suitable on any machine of this purpose compound.Composition, rolls as extruding for high temperature TPE processing, and molding and blow molding operation are particularly advantageous.
TPE composition of the present invention has improved surprisingly performance, and (they are by superoxide only or by 1 with respect to the blend of EAO multipolymer and high-melting-point polymer such as PP; The superoxide of 2 to 2:1 ratios and auxiliary agent carry out rheology modified). utilize rheology modified that can acquisition make us desireing and improved physicals comprehensive of the superoxide of specific ratios and free radical auxiliary agent, comprising for extrude or roll for the parts under higher line speed than smooth surface and improved shape-holding property.
For purpose of the present invention, 1:2 only comprises with the specified 1:2 of integer to the 2:1 ratio, 1:1 and 2:1 ratio.
Composition of the present invention can form various molded articles by using common polymer fabrication processes such as above those definite process quilts.The part of suitable molded article (far from exhaustive) example comprises automobile body components such as dashboard top layer, bumper transverse bar, body side moldings, exterior trim, interior trim, weather strip, air dams, blast main, and wheel cover, use as polymeric film with non-automobile, polymer sheet, tubing, trash cans, storage container, lawn facility web or coiled material, lawn mower, garden hose and other gardening apparatus parts, the recreational vehicle parts, golf ball apparatus transport carriage parts, Public services trolley part and canoe parts. composition also can be used for rooftop applications such as roof membranes. and composition can be further used for making the assembly of footwear such as the axle of boots, industrial work boot especially. those skilled in the art can easily enlarge this and enumerate, and need not too much experiment.
The following example is used for explanation, but limits the present invention ambiguously or implicitly.Except as otherwise noted, otherwise whole part and percentage ratio is by weight, based on gross weight. and numerical range comprises end value, except as otherwise noted. and embodiments of the invention are to be by alphabetic(al) letter representation by Arabic numerals affirmation and comparative example.
Embodiment and comparative example
12 kinds of compositions, seven kinds are represented the present invention (embodiment 1-7) and five kinds is that (Comparative Examples A-E) is by using follow procedure from identical EAO polymer manufacture in contrast.Whole 12 kinds of compositions are by blend that superoxide and auxiliary agent are rolled together, subsequently peroxide/coagent mixture and EAO and PP pellet are rolled blend 30 minutes so that peroxide/coagent mixture be absorbed on the pellet, on the Werner Pfliederer ZSK-30 co-rotating twin screw extruder that uses the single screw feeder of K-tron weight loss (loss-in-weight), to process the pellet that is absorbed then and finally make. this extrudate cool off in water-bath and comes granulation by use Conair pellitizer. and table 1 has provided the forcing machine condition. and identical screw conditions and temperature distribution that this pellet reuses in table 1 are passed same forcing machine, and wherein treated oil (softening agent) is injected in the second forcing machine section.Processing aid 0.35wt% (AmfineAX-71, Amfine Chemical Corporation) and antioxidant 0.3wt% (Irganox B225), based on total wt of TPE composition, be mixed together and be added in the forcing machine at spout by the miniature feeder of weight loss that uses the K-Tron twin screw.
In embodiment 1-5 and Comparative Examples A and B, the mixture of extruding and granulating is extruded into tubing by single screw rod (3/4 inch diameter) forcing machine of Brabender that use has a L/D of 15/1 then. and the tubing of extruding has 11.1mm ID, 0.5mm wall thickness and the pipe extruded in air-cooled .5-psig air is applied on travelling belt pipe to promote cooling internally.Screw speed changes between 50-150rpm, increases progressively with 25rpm.This zone temperatures is: 170 ℃ of chargings, and 180 ℃ of centres, 190 ℃ of the 3rd section (mouthful mould), and the melt temperature of polymkeric substance is between 193-197 ℃.
Embodiment 6 and 7 and comparative example C-E in, the 50mm20/1L/D Davis standard single screw forcing machine that the compound pellet is equipped with 5mm diameter rod material mouth mould by use is extruded into the rod material. this extrudate is transported on the wide rolling press of Steward-Bolling four roller reverse-L46cm with fixed 1:1 roller friction ratio. extrude with the rolling press condition and be shown in the Table II.
Table II
The processing condition of extruding and rolling of embodiment 6-7 and comparative example C-E
| Roller 1 | Roller 2 | Roller 3 | Roller 4 | |
| Rolling temperature, ℃ | 129 | 114 | 93 | 64 |
| Section 1 | Section 2 | Section 3 | Die head | |
| Extrusion temperature, ℃ | 120 | 150 | 180 | 180 |
| The bin stock temperature, ℃ | 179 | |||
| Forcing machine rotating speed RPM | 30 | |||
| Feeding rate kg/hr | 17.7 |
The EAO polymkeric substance that is used for embodiment and comparative example is to have 1
2The ethene of the nominal density of-0.5g/10min and the 0.863g/cc/1-octene copolymer (Engage that is purchased from DuPont DowElastomers L.L.C.
8180 polyolefin elastomers).The polypropylene (PP) that is used for embodiment is that the melt flow ratio is 12 homopolymer polypropylene (the Inspire PPH 700-12 that is purchased from The DowChemical Company).
The superoxide that is used for embodiment and comparative example B is 2,5-2 (from the Lupersol 101 of Elf Atochem acquisition).
The free radical auxiliary agent that is used for embodiment and comparative example is triallyl cyanurate (from Cytec Industries, the TAC that Inc. obtains).Comparative example B uses trimethylolpropane trimethacrylate (from Sartomer Company, 100% SR-350 that Inc. obtains).
The apparent visual determination that is to use naked eyes. what be categorized as " rough " apparently is recognized as by naked eyes easily that to have a sharp crest and paddy and touch perception coarse. be categorized as " smooth " apparent with the naked eye can't find can detected ridge and paddy and touch perception smooth.The screw speed of listing in this watch is the tripping speed (with 25rpm increment) of profiled material when demonstrating smooth surface appearance. initially or the slowest screw speed be that 50rpm and comparative example B have poor appearance under this speed.
Comparative Examples A is not carry out rheology modified EAO and the blend of PP. comparative example B-E is by using in WO 02/24803 for the described same procedure of the preparation of embodiment 1-8 and according to listed superoxide: the auxiliary agent ratio prepares.
Table III has been summed up the data of the composition of embodiment 1-7 and Comparative Examples A-E. and Table III has been stipulated EAO polymkeric substance (EAO), polypropylene (PP), treated oil, the wt% of superoxide (POX) and free radical auxiliary agent (FRC) composition, and superoxide: auxiliary agent ratio.
Table III
| Embodiment/Comparative Examples | EAO | PP | Treated oil | POX | FRC | Superoxide: auxiliary agent ratio |
| 1 | 68 | 26 | 6 | 0.025 | 0.25 | 1:10 |
| 2 | 80 | 20 | 0 | 0.025 | 0.25 | 1:10 |
| 3 | 60 | 40 | 0 | 0.025 | 0.25 | 1:10 |
| 4 | 60 | 30 | 10 | 0.025 | 0.25 | 1:10 |
| 5 | 70 | 20 | 10 | 0.025 | 0.25 | 1:10 |
| 6 | 60 | 37 | 3 | 0.05 | 0.24 | 1:5 |
| 7 | 63 | 37 | 0 | 0.05 | 0.2 | 1:4 |
| A | 68 | 26 | 6 | 0 | 0 | -- |
| B | 69.85 | 29.85 | 0 | 0.15 | 0.15 | 1:1 |
| C | 63 | 37 | 0 | 0.2 | 0.2 | 1:1 |
| D | 63 | 37 | 0 | 0.125 | 0.2 | 1:1.6 |
| E | 63 | 37 | 0 | 0.2 | 0.05 | 4:1 |
The performance of embodiment and comparative example's composition is determined and be reported in the following Table IV. and the gel content of composition is by according to described in the ASTM D 2765-90, measures in 12 hours with the backflow xylene extraction.The gel content of the embodiment product of calendering is determined by visual inspection.
Table IV
The data declaration that in Table IV, provides some.
At first, embodiment 1 to 5 can extrude and obtain to have the profiled material of smooth surface and good resistance collapse strength under high extruded velocity, if too high or too low with respect to Comparative Examples A and B. tan δ or STI, then extrudate has poor apparent or not enough anti-collapse strength.Embodiment 6 and 7 shows that composition of the present invention has also obtained the smooth tablets of visual detection less than gel, when calendering.When calendering, comparative example C and D obtain rough sheets.Comparative example E can access slick calendared sheet, yet this STI and tan δ have deflected away from the desired scope of claim, and it is bad to show that this composition shows when extruding.
For other EAO polymkeric substance, propene polymer and rheology modifier or method of modifying expect similar result, and they are all open in the above.
Claims (22)
1. rheology modified, the composition for thermoplastic elastomer of gel-free, it comprises at least a elastomeric ethylene/alpha-olefinic polymer or ethylene/alpha-olefin polymer blends and at least a high-melting-point polymer that is selected from homopolymer polypropylene and the propylene/ethylene copolymer, wherein this rheology modified be to induce by the binding substances that comprises following superoxide of 0.075wt% or 0.075wt% and free radical auxiliary agent, this superoxide: the auxiliary agent ratio is that 1: 4 to 1: 20 and this are rheology modified, the composition for thermoplastic elastomer of gel-free has the STI of 15-30,1.05-1.40 the tan δ under 190 ℃ and when at ASTM D 2765-90, be lower than the gel content of limit of detection when using dimethylbenzene as solvent among the method B.
2. the composition of claim 1, wherein this peroxide concentrations is 0.050wt% or below the 0.050wt%.
3. the composition of claim 1, wherein this superoxide is an organo-peroxide.
4. the composition of claim 1, wherein this organo-peroxide is selected from α, α '-bis(t-butylperoxy)-diisopropyl benzene, dicumyl peroxide, two-(tert-pentyl) superoxide, 2,5-dimethyl-2,5-two (t-butylperoxy) hexin-3,2, the 5-2,2,5-(tert-pentyl peroxide-2-ethylhexanoate), 2,5-dimethyl-2,5-two-(t-butylperoxy) hexane, ditertiary butyl peroxide, 2,5-two (tert-pentyl peroxy)-2,5-dimethylhexane, 2,5-two-(t-butylperoxy)-2,5-phenylbenzene hexane, two (α-Jia Jibianji) superoxide, t-butylperoxyl benzoate, benzoyl peroxide, 3,6,9-triethyl-3,6,9-trimethylammonium-1,4,7-three peroxide nonane and bis(t-butylperoxy)-diisopropyl benzenes.
5. the composition of claim 1, wherein the free radical auxiliary agent is selected from diallyl terephthalate, triallylcyanurate, cyanacrylate, 1, the 2-polyhutadiene, Vinylstyrene, trimethylolpropane trimethacrylate, polyethylene glycol dimethacrylate, Ethylene glycol dimethacrylate, pentaerythritol triacrylate, allyl methacrylate(AMA), two maleoyl N, N '--the phenylene imines, toluene bismaleimides-p-quininie dioxime, oil of mirbane, and vulkacit D.
6. the composition of claim 5, wherein this free radical auxiliary agent is to be selected from triallylcyanurate, 1,2-polyhutadiene, Vinylstyrene, and trimethylolpropane trimethacrylate.
7. the composition of claim 1, wherein the polymerization therein of this ethylene/alpha-olefin polymer at least a alpha-olefin comonomer, this alpha-olefin contains 3-20 carbon atom.
8. the composition of claim 7, wherein this alpha-olefin contains 3 to 10 carbon atoms.
9. the composition of claim 1, wherein this ethylene/alpha-olefin polymer is diene modified polymkeric substance, this diolefine is selected from norbornadiene, dicyclopentadiene, 1,4-hexadiene, piperylene or 5-ethylidene-2-norbornene and their mixture.
10. the composition of claim 1, wherein this high-melting-point polymer is the polymkeric substance of nucleation.
11. the composition of claim 1 comprises that further content is greater than 0 treated oil in about 50wt% scope, based on total composition weight.
12. the composition of claim 1 or claim 11 comprises that further content is at about 0 filler that arrives in about 70wt% scope, based on total composition weight.
13. prepare TPE method for compositions rheology modified, gel-free, this method comprises: a) with at least a superoxide and at least a free radical auxiliary agent by the superoxide of 1:4 to 1:20: the maximum peroxide concentrations of auxiliary agent ratio and 0.075wt% adds in the molten polymer blend of the high-melting-point polymer that comprises elastomeric ethylene/alpha-olefinic polymer and be selected from homopolymer polypropylene and propylene/ethylene copolymer; And b) keeping blend polymer also to allow it experience those simultaneously under melted state is enough to superoxide and auxiliary agent are dispersed in the whole molten polymer blend, implement the rheology modified of this polymkeric substance and stop the insoluble polymer gel (by at ASTM D 2765-90, use dimethylbenzene to measure among the method B as solvent) formation shearing condition, enough rheology modified be to weigh by the STI of 15-30 and the tan δ of 1.05-1.40.
14. prepare TPE method for compositions rheology modified, gel-free, this method comprises:
A) at least a superoxide and at least a free radical auxiliary agent are pressed the superoxide of 1:4 to 1:20: the maximum peroxide concentrations of auxiliary agent ratio and 0.075wt%, before each component is by blend, add at least a component of blend polymer, this component polymer comprises elastomeric ethylene/alpha-olefinic polymer and is selected from the high-melting-point polymer of homopolymer polypropylene and propylene/ethylene copolymer;
B) these component polymer of blend; With
C) blend polymer is changed into molten polymer blend and allow this blend experience those simultaneously to be enough to superoxide and auxiliary agent are dispersed in the whole molten polymer blend, implement the rheology modified of this polymkeric substance and stop the insoluble polymer gel (by at ASTM D 2765-90, use dimethylbenzene to measure among the method B as solvent) the shearing condition of formation, enough rheology modified is to be weighed by the STI of 15-30 and the tan δ of 1.05-1.40.
15. the method for claim 13 or claim 14, wherein follow-up step c) after step b) and step c) comprise rheology modified polymer blend be transformed into goods.
16. the method for claim 15 further is included in the intermediate step b in succession 1 before the step c)) and b2), step b1) comprise that rheology modified polymer blend reclaims and step b2 with solid) comprise the melted state that this solid changes into is enough to make these goods.
17. prepare the method for the thermoplastic elastomer goods of rheology modified, gel-free, this method comprises:
A) with at least a superoxide and at least a free radical auxiliary agent by the superoxide of 1:4 to 1:20: the maximum peroxide concentrations of auxiliary agent ratio and 0.075wt% adds in fusing elastomeric ethylene/alpha-olefinic polymer or the elastomeric ethylene/alpha-olefin polymer blends, obtains rheology modified ethylene/alpha-olefin polymer or ethylene/alpha-olefin polymer blends;
B) interpolation is selected from the high-melting-point polymer of homopolymer polypropylene and propylene/ethylene copolymer and forms the compound blend polymer in rheology modification of polymers or blend polymer; With
C) the compound blend polymer is transformed into goods, these goods have smooth surface appearance and when at ASTM D 2765-90, are lower than the gel content of limit of detection when using dimethylbenzene as solvent among the method B.
18. have the goods of the assembly that the composition of at least a Accessory Right requirement 1 makes.
19. the goods of claim 18, wherein composition further comprises at least a additive that is selected from treated oil and filler.
20. the goods of claim 19, wherein treated oil is to exist greater than 0 amount in about 50wt% scope, based on total composition weight.
21. the goods of claim 19, wherein this filler is to be selected from glass, silica, carbon black, metal carbonate, metal sulfate, talcum, clay and graphite fibre.
22. the goods of claim 19, wherein filler is to exist greater than 0 amount in about 70wt% scope, based on total composition weight.
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| WO2012088689A1 (en) * | 2010-12-30 | 2012-07-05 | Dow Global Technologies Llc | Thermoplastic vulcanizate composition, method of producing the same, and articles made therefrom |
| CN109563214A (en) * | 2016-08-31 | 2019-04-02 | 陶氏环球技术有限责任公司 | Modified poly ethylene |
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| EP3327077A1 (en) * | 2016-11-24 | 2018-05-30 | SABIC Global Technologies B.V. | Process or use for the production of polyethylene materials having a reduced gel content |
| KR102584104B1 (en) * | 2017-08-30 | 2023-10-05 | 다우 글로벌 테크놀로지스 엘엘씨 | Peroxide-containing polyolefin formulations |
| CN115651657B (en) * | 2022-11-03 | 2024-02-09 | 北京斯伯乐科学技术研究院 | Preparation and application methods of deoxidizer for methanol-to-olefin device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012088689A1 (en) * | 2010-12-30 | 2012-07-05 | Dow Global Technologies Llc | Thermoplastic vulcanizate composition, method of producing the same, and articles made therefrom |
| CN109563214A (en) * | 2016-08-31 | 2019-04-02 | 陶氏环球技术有限责任公司 | Modified poly ethylene |
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