CN101747543B - Styrene-butadiene copolymer chemical foaming composition containing polystyrene micro-blocks, preparation method and application method thereof - Google Patents
Styrene-butadiene copolymer chemical foaming composition containing polystyrene micro-blocks, preparation method and application method thereof Download PDFInfo
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Abstract
The invention discloses a styrene-butadiene copolymer chemical foaming composition containing polystyrene micro-blocks, a preparation method and an application method thereof. The preparation method takes styrene-butadiene copolymer mixing random structure with block structure as base material, and adds flow modifier or softener to regulate the fluidity of rubber. Rubber compositions manufactured by the method have good fluidity and can be molded directly through injection. Chemical foaming agents added reduces product density and effectively achieves the aim of obtaining lightweight material. Post partial chemical crosslinking can be performed so as to improve the stress cracking resistance and wear resistance of the material. Meanwhile, as the partial physical crosslinking of the styrene-butadiene copolymer allows the material to overcome the defect that all-chemical crosslinked rubber cannot be regenerated, the material can be recycled and regenerated.
Description
Technical field
The present invention relates to the synthetic field of chemical industry, be meant a kind of styrene-butadiene copolymer compsn and preparing method's and methods for using them especially.
Background technology
As everyone knows, styrene/butadiene block copolymer (SBS) is that industrialized the earliest vinylbenzene belongs to the monomer base thermoplastic elastomer.SBS can be used for for example preparing sole, tackiness agent, daily elastomerics, modifying asphalt and plastics.The maximum Application Areas of SBS is a sole, and sole has accounted for more than 50% of world SBS consumption with SBS.
The lightweight of SBS footwear material is the developing direction of SBS footwear material always, and foaming is the most effectively means of footwear material lightweight.SBS footwear material lightweight at present is a main direction of studying to decompose the physical blowing that low-boiling point liquid gasifies in the chemicalfoaming that produces gas and the foam microspheres through chemical foaming agent (like the AC whipping agent) mainly.
The chemicalfoaming of SBS footwear material: because traditional SBS is the segmented copolymer that is separated, the shear viscosity of its melt is very insensitive to temperature and shearing rate.SBS cinnamic physical entanglement meeting in the course of processing causes its melt viscosity uneven (PB segment viscosity is low, and PB and PS phase interface viscosity are high), and it is inhomogeneous to make that the AC whipping agent disperses, and causes that abscess is uneven.Therefore the tear strength of SBS foaming back goods, tensile strength, wear resistance etc. can not satisfy the requirement of sole.For the tensile strength that improves foaming product, tear strength, chemically-resistant solvent, performance such as wear-resisting; A method is in foaming process, to add linking agent; But there are two difficulties that are difficult to overcome in this: the one, and the adding problem of linking agent; The decomposition temperature of general linking agent is below 140 ℃, and the plasticization temperature of SBS is more than 170 ℃; The 2nd, the two key density of the polyhutadiene phase of traditional SBS are high, " glue burning " (the chain type thermopositive reaction rapidly of a kind of utmost point) phenomenon under the linking agent effect, can occur, and production is difficult to carry out or exists potential safety hazard or product percent of pass low.
The physical blowing of SBS footwear material: owing to can realize injecting continuously foam-in-mould; And obtain controlled foaming thing cortex and improve wear resistance; The SBS physical blowing that adopts foam microspheres or micro mist is the focus of viton footwear material research always, but because SBS is a thermoplastic elastomer, therefore; Under the effect of foam microspheres long-term tension,, the molecular chain legibility cause footwear material surface be full of cracks even phenomenon of rupture under no luminous environment, also can occur even twining.Therefore, this series products can not get promoting the use of on a large scale all the time.
Because many defectives more than the SBS foaming shoe material exists, cause the density of the sole that SBS processes high, wear no resistance, therefore progressively substituted in recent years by other can foam light material such as EVA, urethane (PU) etc.
The tensile strength of the EVA foaming product that uses at present, tear strength, compression set, wear-resisting, non-skid property etc. more presents plastic properties, can not satisfy the requirement of shoe-making industry fully.Although the wear-resisting excellent property of urethane, also there is shortcoming in foaming raw material at the bottom of the polyurethane shoe, and for example the heat-curable urethane facility investment is high, the toxic of urethane monomer is big, foam process complicacy etc.
Therefore, be desirable to provide novel injectable crosslinkable chemicalfoaming styrene-butadiene copolymer (SBS) compsn that can be used for shoe sole applications.
There have been a large amount of documents and patent to introduce about styrene-butadiene copolymer, about rubber, thermoplastic elastomer foaming a large amount of introductions arranged also simultaneously.Such as, Chinese patent (CN 101113188A) has been introduced a kind of continuous preparation method of random conjugated diene/vinyl arene copolymers.This patent is defined as vinylbenzene with vinyl-arene, and conjugated diolefine is defined as 1,3 divinyl, and the molecular weight of this multipolymer is 200,000-800, and 000, monodisperse system is counted Mw/Mn=1.6-2.5.This kind multipolymer is designed for the doughnut tyre surface.This copolymer molecule chain is a linear structure, has hinted in the patent that its preparation method can produce the multipolymer with specific degree of branching, and has not carried out the coupling step with close isoelectric substance (like SiCl4).The structure difference of the star structure multipolymer in this and this patent is bigger.Molecular weight of copolymer in the above-mentioned patent is excessive simultaneously, infers because melt viscosity is crossed senior general and can't be foamed according to general knowledge, more can not carry out injection moulding processing.
USP (USP 4367325) has been introduced a kind of styrene/butadiene random copolymers and working method thereof.The styrene monomer content of this styrene/butadiene random copolymers is 3-30%, and 1,2 paradigmatic structure content of divinylic monomer is 70-90%.This multipolymer is used to produce doughnut, has low rolling resistance and high anti-slippery ability.This multipolymer styrene monomer content lower (being 35-50% in this patent), melt viscosity is high, can not carry out injection moulding processing.
Chinese patent (CN 101255242A) has been introduced a kind of butadiene styrene rubber foaming plate and preparation method thereof.The base mateiral that this patent adopts is styrene-butadiene rubber(SBR), tree elastomer and cis-1,4-polybutadiene rubber, and the molecular weight of these materials is all excessive, causes the melt viscosity of material big, can't inject processing.This patent adopts sulfur cross-linking system simultaneously, and curing temperature is low, in the injector screw rod, promptly takes place crosslinkedly easily, and this formula system also can't be injected processing.
Summary of the invention
First purpose of the present invention is in order to overcome the shortcoming and defect that prior art exists, and a kind of styrene-butadiene copolymer chemical foaming composition that comprises the PS section is provided.
Second purpose of the present invention provides a kind of preparation method who comprises the styrene-butadiene copolymer chemical foaming composition of polystyrene micro-blocks.
The 3rd purpose of the present invention provides a kind of method that is applied to injection moulding production foaming product that comprises the styrene-butadiene copolymer chemical foaming composition of polystyrene micro-blocks.
The 4th purpose of the present invention provides the foaming product that styrene-butadiene copolymer chemical foaming composition that a kind of basis comprises polystyrene micro-blocks makes.
For realizing first purpose of the present invention, technical scheme of the present invention is that each proportioning raw materials does, and is wherein according to the mass fraction raw materials used:
40～70 parts of styrene-butadiene copolymers
9～30 parts of flow ability modifying agents
10～50 parts of tenderizers
0.1～2 part of chemical foaming agent
0～30 part of rubber
0～30 part of filler
0～30 part of reworked material
0.1～1 part of vulcanizing agent
0.1～1 part of vulcanization aid
The molecular structure of described styrene-butadiene copolymer is a linear structure when further being provided with, its molecular structural formula is-and (PSx-PBy) n-, wherein
PS is a styrenic polymer,
PB is a butadiene polymer,
x＝1-300，y＝1-2000，n＝10-3000；
The weight percentage of styrene monomer is 5-80% in the styrene-butadiene copolymer altogether; The number-average molecular weight of multipolymer is 40000-500000; Styrene monomer and divinylic monomer are the alternately micro-block structure of the repeatedly block copolymerization formation of complete random copolymerization structure or styrene monomer and divinylic monomer in the molecular chain structure of this polymkeric substance; 1 in the divinylic monomer wherein, the 2-structural content is 10～40%.
This is provided with can also be that the molecular structure of described styrene-butadiene copolymer is the multi-arm star structure, and its molecular structural formula is ((PSx-PBy) n-) mR, wherein
PS is a styrenic polymer,
PB is a butadiene polymer,
R is star structure " nuclear ",
x＝1-300，y＝1-2000，n＝10-3000，m＝3-20；
The weight percentage of styrene monomer is 5-80% in this styrene-butadiene copolymer.The number-average molecular weight of multipolymer is 40000-500000; The alternately micro-block structure that the repeatedly block copolymerization of the complete random copolymerization structure of styrene monomer and divinylic monomer or styrene monomer and divinylic monomer forms in the molecular chain structure of this polymkeric substance; 1 in the divinylic monomer wherein, the 2-structural content is 10～40%.
Described rubber can be selected at least a in tree elastomer, styrene-butadiene rubber(SBR), cis-1,4-polybutadiene rubber, polyisoprene rubber, paracril, butyl rubber, halogenated butyl rubber, ethylene-propylene rubber(EPR), the terpolymer EP rubber for use.This setting is through adding a certain specified property that rubber can improve foam material; Can improve tensile strength such as tree elastomer; Cis-1,4-polybutadiene rubber can improve elasticity and wear resisting property, and paracril can improve oil resistance, and halogenated butyl rubber can improve oil resistant and non-skid property;
Described flow ability modifying agent can be selected at least a in styrene-butadiene-styrene multipolymer, styrene-ethylene-butylene-styrene multipolymer, styrene-ethylene-propylene-styrene multipolymer, Injecatable EVA Copolymer, the ethylene-octene copolymer for use.
Described filler can be selected at least a in carbon black, silicon-dioxide, lime carbonate, talcum powder, the potter's clay for use.
Described reworked material can be selected at least a in regenerated rubber, regnerated rubber powder, EVA regeneration powder sheet or EVA regeneration powder particles, TR or TPR reworked material, PU powder, recycled polyethylene, the polypropene recycled materials for use.This is provided with and adds reworked material and material is not significantly reduced under the prerequisite of performance reduce cost.
Described tenderizer can be selected at least a in NO, alkane oil, aromatic hydrocarbon oil, machinery oil, lubricating oil, paraffin, whiteruss, petroleum pitch, Vaseline, coal tar, Viscotrol C, linseed oil, ointment, the atactic polypropylene(APP) for use.
Described vulcanizing agent can be selected Lucidol, biconjugate Lucidol, ditertiary butyl peroxide, Di Cumyl Peroxide 99, hydrogen phosphide cumene, tert-butyl peroxide cumyl, di-t-butyl peroxide-3 for use; 3; 5-trimethyl-cyclohexane, 2; 5-dimethyl--2, at least a in 5-two (t-butyl peroxy) hexane.
Described vulcanization aid can be selected at least a in sulphur, paraquinonedioxime, dimethacrylate macrogol ester, trimethylolpropane tris (2-methylacrylic acid) ester, iso-cyanuric acid triallyl ester, para Toluic Acid's diallyl, the Vinylstyrene for use.
Described chemical foaming agent is sodium hydrogencarbonate, yellow soda ash, bicarbonate of ammonia, volatile salt, an ammonium nitrate, N; N '-dimethyl--N; N '-dinitroso pentamethylene tetramine, N, at least a in N '-dinitroso five methyne tetramines, Diisopropyl azodicarboxylate, azo two cyclohexanenitriles, azo diaminobenzene, barium azodicarboxylate, Cellmic C 121, benzol sulfohydrazide, toluene sulfonyl hydrazide, two benzol sulfohydrazide ethers, azide calcium, the azide p-toluenesulfonyl.
Also include the auxiliary agent that adds according to different part performance needs, this auxiliary agent is one or more in frothing aid, softening agent, anti-aging agent, thermo-stabilizer, anti ultraviolet agent, static inhibitor, tinting material, releasing agent, strengthening agent, fire retardant, viscosity increaser, the tack reducing material.This addition that each auxiliary agent is set can be controlled according to actual needs, is limit not damage beneficial effect of the present invention.
Find that through the inventor's years of researches styrene-butadiene copolymer compsn that comprises the little block of vinylbenzene has good injectable chemicalfoaming performance; This is because this styrene-butadiene copolymer that comprises polystyrene micro-blocks has suitable molecular weight and styrene monomer content; Therefore under hot-work, have lower melt viscosity, can inject processing easily.And lower melt viscosity makes chemical foaming agent be uniformly dispersed easily and even foaming.Under the chemical cross-linking agent effect through these cross-linking set formed copolymer molecule network can finely avoid under the effect of chemical foaming agent long-term tension the styrene-butadiene copolymer molecular chain to separate twining check surface of footwear material even the footwear material phenomenon of rupture that is caused.Because the little block of polyhutadiene hydrocarbon is evenly distributed in the polystyrene micro-blocks, fundamentally avoided because polyhutadiene is assembled the crosslinked thermopositive reaction of quick chain type that causes, so also can not produce SBS " glue burning " phenomenon.This copolymer structure design not only guarantees to adopt the foam material of this multipolymer production to have the elasticity of enough rubber like materials; And the PS of part belongs to physical crosslinking that the little block of monomer forms and gives this material and still keep the renewable processing characteristics of conventional SBS, has environmental protection characteristic.Therefore this kind multipolymer can be used for shoe sole production.And said multipolymer can adopt existing foam-injection production equipment to produce at low cost.Whipping agent adopts general chemical foaming agent, compares with the physical blowing that contains foam microspheres, has lower-cost advantage.
For realizing second purpose of the present invention, technical scheme of the present invention is may further comprise the steps, wherein raw materials used proportioning preparation by claim 1: at first with styrene-butadiene copolymer, flow ability modifying agent, rubber, filler, reworked material, tenderizer, and auxiliary agent put into the Banbury mixer banburying simultaneously; Mixed 5～30 minutes, and added vulcanizing agent, vulcanization aid, chemical foaming agent then, mixed 2～5 minutes; 60～120 ℃ of Banbury mixer temperature are mixed the sizing material after the banburying with mill, sheet down after thin logical 5～20 times; At last sizing material is used the forcing machine extruding pelletization; Extruder temperature is 60～110 ℃, through vane pelletizing or water ring pelletizing.
For realizing second purpose of the present invention, technical scheme of the present invention can also be may further comprise the steps, wherein raw materials used proportioning preparation by claim 1: at first will put into the Banbury mixer banburying by flow ability modifying agent, the tenderizer of the said proportioning of claim 1; Mixed 2～15 minutes, and added styrene-butadiene copolymer, rubber, filler, reworked material and auxiliary agent then, mixed 3～15 minutes; Add vulcanizing agent, vulcanization aid, chemical foaming agent again; Mixed 2～5 minutes, 60～120 ℃ of Banbury mixer temperature are mixed the sizing material after the banburying with mill; Sheet under after thin logical 5～20 times; At last sizing material is used the forcing machine extruding pelletization, extruder temperature is 60～110 ℃, through vane pelletizing or water ring pelletizing.
For realizing second purpose of the present invention, technical scheme of the present invention can also be may further comprise the steps, wherein raw materials used proportioning preparation by claim 1: at first with the styrene-butadiene copolymer of certain proportioning, flow ability modifying agent, rubber, filler, reworked material, tenderizer, and auxiliary agent put into the Banbury mixer banburying simultaneously; Mixed 5～30 minutes; 100～160 ℃ of Banbury mixer temperature, the sizing material after the banburying is in blocks with mill, add vulcanizing agent, vulcanization aid, chemical foaming agent; Sheet under after thin logical 10～30 times; At last sizing material is used the forcing machine extruding pelletization, 60～110 ℃ of extruder temperatures are through vane pelletizing or water ring pelletizing.Because reworked material is that the higher material of some melt temperature is like regeneration PP, PE; During banburying temperature is improved; If in Banbury mixer, add vulcanizing agent, vulcanization aid, chemical foaming agent; Vulcanizing agent, vulcanization aid, chemical foaming agent will be decomposed, therefore sizing material is put in the mill of normal temperature and adds vulcanizing agent, vulcanization aid, chemical foaming agent again after the cooling in flakes.
For realizing the 3rd purpose of the present invention; The method of foaming product is produced in compsn injection moulding of the present invention; It is characterized in that: the styrene-butadiene copolymer chemical foaming composition that will contain polystyrene micro-blocks mixes and granulation under the temperature below 120 ℃ with processing aid, linking agent and whipping agent; Then the pellet that obtains is injected mould and carries out foam-injection therein through injection moulding machine, obtain foaming product.
For realizing the 4th purpose of the present invention, the density of this foaming product of the present invention: 0.2～1.0 (g/cm3).This foaming product can be used for making at the bottom of beach shoes, slippers, sneakers, the sports shoes and the big end of leather shoes, perhaps is used for automobile interior trim material and lagging material
Beneficial effect of the present invention
1) compare with this styrene-butadiene copolymer physical blowing compsn that contains foam microspheres, the foam-in-mould difficulty, but this styrene-butadiene copolymer chemical foaming composition has the low advantage of cost, and the mould that is fit to high foamability foams outward.
2) this styrene-butadiene copolymer compsn foaming product can adopt on existing EVA foam-injection equipment and the rubber plate vulcanization equipment and produce, and production unit need not to transform.
3) this styrene-butadiene copolymer has suitable molecular weight and styrene monomer content, therefore under hot-work, has lower melt viscosity, can make this styrene-butadiene copolymer compsn inject processing easily.And lower melt viscosity makes chemical foaming agent be uniformly dispersed easily and even foaming.
4) this styrene-butadiene copolymer compsn under the chemical cross-linking agent effect through these cross-linking set formed copolymer molecule network can finely avoid under the effect of foam microspheres long-term tension the styrene-butadiene copolymer molecular chain to separate twining check surface of footwear material even the footwear material phenomenon of rupture that causes like conventional SBS.
5) foam material of this styrene-butadiene copolymer compsn still keeps rubber property, excellent wet-sliding resistant performance, and compression set is low, and elastic recovery is good, and wear resistance, tensile strength at yield and tear strength all are better than the EVA foam material.
6) foamed products of this styrene-butadiene copolymer compsn can be used to make beach shoes and slippers, can also be used for making at the bottom of sneakers, the sports shoes and the big end of leather shoes, also can be used for the lagging material of automobile interior trim material and various occasions.
Below in conjunction with embodiment the present invention is done further introduction.
Embodiment
Through embodiment the present invention is carried out concrete description below; Only be used for the present invention is further specified; Can not be interpreted as the qualification to protection domain of the present invention, the technician in this field can make some nonessential improvement and adjustment to the present invention according to the content of foregoing invention.
Embodiment 1
By following component and content (mass parts)
50 parts of styrene-butadiene copolymers
10 parts of cis-1,4-polybutadiene rubbers
5 parts of styrene-butadiene-styrene multipolymers
4 parts of silica 1s
10 parts of regenerated rubbers
10 parts of NOs
0.4 part of Di Cumyl Peroxide 99
0.3 part of iso-cyanuric acid triallyl ester
0.3 part of Cellmic C 121
At first styrene-butadiene copolymer, styrene-butadiene-styrene multipolymer, cis-1,4-polybutadiene rubber, silicon-dioxide, regenerated rubber, the NO of said ratio are put into the Banbury mixer banburying simultaneously, mixed 5 minutes.Add Di Cumyl Peroxide 99, iso-cyanuric acid triallyl ester, Cellmic C 121 then, mixed 2 minutes, 100 ℃ of Banbury mixer temperature are mixed the sizing material after the banburying with mill, sheet down after thin logical 10 times.At last sizing material is used the forcing machine extruding pelletization, extruder temperature is 80 ℃, through the vane pelletizing.
Embodiment 2
By following component and content (mass parts)
40 parts of styrene-butadiene copolymers
10 parts of terpolymer EP rubbers
15 parts of Injecatable EVA Copolymers
13.5 parts of talcum powder
10 parts in regeneration EVA powder
10 parts in machinery oil
0.2 part of tert-butyl peroxide cumyl
0.3 part of trimethylolpropane tris (2-methylacrylic acid) ester
1 part of Cellmic C 121
At first styrene-butadiene copolymer, Injecatable EVA Copolymer, terpolymer EP rubber, talcum powder, regeneration EVA powder, the machinery oil of said ratio are put into the Banbury mixer banburying simultaneously, mixed 5 minutes.Add tert-butyl peroxide cumyl, trimethylolpropane tris (2-methylacrylic acid) ester, Cellmic C 121 then, mixed 2 minutes, 100 ℃ of Banbury mixer temperature are mixed the sizing material after the banburying with mill, sheet down after thin logical 10 times.At last sizing material is used the forcing machine extruding pelletization, extruder temperature is 80 ℃, through the vane pelletizing.
Embodiment 3
By following component and content (mass parts)
49 parts of styrene-butadiene copolymers
10 parts of paracrils
5 parts of styrene-ethylenes-propylene-styrene multipolymer
3.5 parts of silica 1s
10 parts of regnerated rubber powders
10 parts of aromatic hydrocarbon oil
0.2 part of tert-butyl peroxide cumyl
0.3 part of trimethylolpropane tris (2-methylacrylic acid) ester
2 parts of Cellmic C 121s
At first styrene-ethylene-propylene-styrene multipolymer, the aromatic hydrocarbon oil of said ratio are put into the Banbury mixer banburying, mixed 3 minutes, add styrene-butadiene copolymer, paracril, silicon-dioxide, regnerated rubber powder then; Mixed 8 minutes; Add tert-butyl peroxide cumyl, trimethylolpropane tris (2-methylacrylic acid) ester, Cellmic C 121 again, mixed 100 ℃ of Banbury mixer temperature 2 minutes; Sizing material after the banburying is mixed sheet down after thin logical 10 times with mill.At last sizing material is used the forcing machine extruding pelletization, extruder temperature is 70 ℃, through the vane pelletizing.
Embodiment 4
By following component and content (mass parts)
70 parts of styrene-butadiene copolymers
9 parts of styrene-ethylenes-propylene-styrene multipolymer
0 part of silica 1
10 parts of aromatic hydrocarbon oil
0.2 part of Di Cumyl Peroxide 99
0.3 part of trimethylolpropane tris (2-methylacrylic acid) ester
0.5 part in two benzol sulfohydrazide ethers
At first styrene-butadiene copolymer, styrene-ethylene-propylene-styrene multipolymer, silicon-dioxide, the aromatic hydrocarbon oil of said ratio are put into the Banbury mixer banburying simultaneously, mixed 8 minutes.Add Di Cumyl Peroxide 99, trimethylolpropane tris (2-methylacrylic acid) ester, two benzol sulfohydrazide ethers then, mixed 2 minutes, 100 ℃ of Banbury mixer temperature are mixed the sizing material after the banburying with mill, sheet down after thin logical 10 times.At last sizing material is used the forcing machine extruding pelletization, extruder temperature is 80 ℃, through the vane pelletizing.
Embodiment 5
By following component and content (mass parts)
53.5 parts of styrene-butadiene copolymers
10 parts of cis-1,4-polybutadiene rubbers
5 parts of styrene-butadiene-styrene multipolymers
0 part of silica 1
10 parts of regenerating polypropylenes
10 parts of alkane oil
0.2 part of Di Cumyl Peroxide 99
0.3 part of iso-cyanuric acid triallyl ester
1 part in two benzol sulfohydrazide ethers
At first with the styrene-butadiene copolymer of said ratio, styrene-butadiene-styrene multipolymer, cis-1,4-polybutadiene rubber, silicon-dioxide, regenerating polypropylene, alkane oil, put into the Banbury mixer banburying simultaneously; Mixed 10 minutes; 160 ℃ of Banbury mixer temperature, the sizing material after the banburying is in blocks with mill, add Di Cumyl Peroxide 99, iso-cyanuric acid triallyl ester, two benzol sulfohydrazide ethers; Sheet under after thin logical 10 times; At last sizing material is used the forcing machine extruding pelletization, 90 ℃ of extruder temperatures are through the water ring pelletizing.
The foaming product performance test
The rubber particles that embodiment is made passes through injector injection molding, makes foam sheet.The injection mould has heating unit, can be heated to 200 ℃ mould is the highest.
Annotate: 1. the melting index test condition is 200 ℃, 5Kg; Do not add vulcanizing agent during the melting index test
2. specimen preparation condition: 70 ℃ of injection temperatures, 170 ℃ of die temperatures, 300 seconds dwell times of heating
Claims (3)
1. a styrene-butadiene copolymer chemical foaming composition that contains polystyrene micro-blocks is characterized in that each proportioning raw materials does, and is wherein according to the mass fraction raw materials used:
2. the styrene-butadiene copolymer chemical foaming composition that contains polystyrene micro-blocks according to claim 1; It is characterized in that: the molecular structure of described styrene-butadiene copolymer is a linear structure; Its molecular structural formula is-(PSx-PBy) n-, wherein
PS is a styrenic polymer,
PB is a butadiene polymer,
x＝1-300，y＝1-2000，n＝10-3000；
The weight percentage of styrene monomer is 5-80% in the styrene-butadiene copolymer altogether; The number-average molecular weight of multipolymer is 40000-500000; Styrene monomer and divinylic monomer are the alternately micro-block structure of the repeatedly block copolymerization formation of complete random copolymerization structure or styrene monomer and divinylic monomer in the molecular chain structure of this polymkeric substance; 1 in the divinylic monomer wherein, the 2-structural content is 10～40%.
3. the styrene-butadiene copolymer chemical foaming composition that contains polystyrene micro-blocks according to claim 1; It is characterized in that: the molecular structure of described styrene-butadiene copolymer is the multi-arm star structure; Its molecular structural formula is ((PSx-PBy) n-) mR, wherein
PS is a styrenic polymer,
PB is a butadiene polymer,
R is star structure " nuclear ",
x＝1-300，y＝1-2000，n＝10-3000，m＝3-20；
The weight percentage of styrene monomer is 5-80% in this styrene-butadiene copolymer; The number-average molecular weight of multipolymer is 40000-500000; The alternately micro-block structure that the repeatedly block copolymerization of the complete random copolymerization structure of styrene monomer and divinylic monomer or styrene monomer and divinylic monomer forms in the molecular chain structure of this polymkeric substance; 1 in the divinylic monomer wherein, the 2-structural content is 10～40%.
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-
2009
- 2009-12-09 CN CN2009101553114A patent/CN101747543B/en not_active Expired - Fee Related
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