CN107501595A - A kind of method of non-melt state expanded polypropylene plastics - Google Patents

A kind of method of non-melt state expanded polypropylene plastics Download PDF

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Publication number
CN107501595A
CN107501595A CN201710727092.7A CN201710727092A CN107501595A CN 107501595 A CN107501595 A CN 107501595A CN 201710727092 A CN201710727092 A CN 201710727092A CN 107501595 A CN107501595 A CN 107501595A
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foaming
polypropylene
polypropylene plastics
melt state
expanded polypropylene
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CN107501595B (en
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陈庆
昝航
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Anhui Dongyuan New Materials Co.,Ltd.
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Chengdu New Keli Chemical Science Co Ltd
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    • C08J9/22—After-treatment of expandable particles; Forming foamed products
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Abstract

The invention belongs to the remarkable high polymer material polypropylene plastics preparing technical field of performance, there is provided a kind of method of non-melt state expanded polypropylene plastics.The expandable microspheres foaming agent of liquid and certain polymer is mutually protected in this method water flowing first; then added with together with polypropylene and softening agent in mill; it is put into while hot after slice in the mould in vulcanizing press, high temperature is suppressed and the polypropylene plastics of non-melt state foaming is obtained after cooling down.This method is not only avoided that the problem of melt strength of polypropylene low strap comes, and also removes from and is heated at high temperature the step of melting to polypropylene, reduces production cost.Compared with conventional method, the foaming method of the invention used, foam characteristics are stable, and abscess-size is controllable, can obtain the polypropylene foam of hole-closing structure, while repeatability is high, easy to operate, and large-scale production can be achieved.

Description

A kind of method of non-melt state expanded polypropylene plastics
Technical field
The invention belongs to the remarkable high polymer material-polypropylene plastics preparing technical field of performance, there is provided a kind of non-molten Melt the method for state expanded polypropylene plastics.
Background technology
Polypropylene（PP, it is the abbreviation of English Poly Propylene beginnings letter）It is to start nineteen fifties greatly A kind of synthetic resin of production is measured, it is Noblen or propylene α-alkene（Ethene, butene-1, hexene -1）Copolymer, The linear structure of its molecule, density is 0.89~0.91g/cm3, also lower than the density of low density polyethylene (LDPE).Because PP has phase It is high to hardness, proportion is small, tensile strength is high, the transparency is good, anti-stress cracking and chemical-resistance are good, resistance to heat deflection temperature height, And have the advantages that fabulous injection performance, arbitrarily can stretch and orient, can with other materials blending and modifying, therefore PP apply Scope constantly expands, and demand growth is fastest in five big resins for universal use, gradually substitutes steel, timber, paper, poly- carbonic acid Other synthetic materials such as ester, ABS, PS, nylon, polyester.
The PP of conventional method production is a kind of line style semicrystalline polymeric, and strand is seldom branched, molecular weight distribution phase To narrower, this cause its softening point and fusing point very close to.Before temperature reaches fusing point, it does not flow substantially, when temperature surpasses After crossing fusing point, melt strength drastically declines, and this melt is difficult to encase gas;In addition, polypropylene is changed into crystallization from molten state State can release substantial amounts of heat, longer the time required to being solid by melt transform;In addition polypropylene air penetrability is high, and foamed gas are easy Escape.Therefore it is narrow suitable for polypropylene expanded temperature range, foaming process is difficult control, easily causes steep that wall in foaming process to break Split, gas is escaped, abscess caves in and bubble merges.
EPP (Expanded Polypropylene) is expanded polypropylene material, and it is a kind of the highly crystalline of performance brilliance Type polymer/gas recombination material, fastest-rising environment-friendly novel resistance to compression at present is turned into its unique and superior performance and buffered Heat-barrier material.EPP products have very excellent antidetonation energy absorption performance, response rate is high after deformation, good heat resistance, chemically-resistant Product, oil resistivity and thermal insulation;Meanwhile its light weight, article quality can be greatly reduced;In addition, EPP or a kind of environmentally friendly material Material, it is prone to β degradeds, and PP foams are easy to recycle, its environment friendly is better than other foamed materials, thus is referred to as " green " foam.The excellent properties showed just because of it so that EPP turns into after polystyrene (EPS), polyurethane (EPU) novel foam material of application value and market potential, is had more after polyethylene (EPE) foamed material.
PP melt strength is low, significantly limit its range of work and application field, such as in thermo forming fields, due to PP Melt strength is low, and container wall thickness is uneven when causing plastics sucking moulding or rupture;When extrusion coated, common PP is shown significantly Constriction and melt resonance, thus there is phenomena such as edge curl, shrink;During extrusion foaming, micro-pore wall easily ruptures, foaming times Rate is low.Thus to expect the PP foam material of high quality, it is crucial to improve its melt strength.
Microspheres refer to the particle with core shell structure that polymer shell parcel hydrocarbon is formed, and have steady Fixed foam characteristics, it can be effectively used for the foaming and intumescing of various types of materials.Because the microballoon after expansion has light, homogeneous foaming The advantages that multiplying power, and there is special role in heat-insulated, sound insulation, damping, loss of weight etc., have a wide range of applications in the industry.
For the above situation, and the superior foam performance of microspheres is combined, it is proposed that proposing a kind of non-melt state hair The method of foaming polypropylene plastics, it is characterised in that polypropylene is not foamed in the molten state.First with appropriate low molecule Amount aliphatic hydrocarbon, aromatic hydrocarbon or chlorinated hydrocabon soften to polypropylene, using expandable microspheres as foaming agent, are evenly dispersed into hair In foam system.Then foaming system suitably being heated up, the hydrocarbon blowing agents gasification in expandable microspheres, microballoon expands, Obtain PP foam material.Not only be avoided that using this method melt strength of polypropylene low strap come the problem of, also remove to poly- The step of propylene high-temperature heating melting, reduce production cost.
The content of the invention
It is an object of the invention to provide a kind of method of non-melt state expanded polypropylene plastics, it is avoided that melt polypropylene is strong The problem of degree low strap comes, also removes from and is heated at high temperature the step of melting to polypropylene, reduce production cost.With conventional method phase Than the foaming method that the present invention uses, foam characteristics are stable, and abscess-size is controllable, can obtain the polypropylene foam of hole-closing structure Plastics, while repeatability is high, it is easy to operate, large-scale production can be achieved.
Concrete technical scheme of the present invention is as follows：
The expansion of liquid and certain polymer is mutually protected in a kind of method of non-melt state expanded polypropylene plastics, first water flowing Microballoon foaming agent, then add together with polypropylene and softening agent as in mill, be put into while hot in vulcanizing press after slice In mould, high temperature is suppressed and the polypropylene plastics of non-melt state foaming is obtained after cooling down.Comprise the following steps that：
（1）Water, sodium hydroxide, six hydrated magnesiums, lauryl sodium sulfate and sodium chloride are added in agitator in proportion, it is acute Strong stirring, form stable aqueous phase protection liquid.Then by a certain amount of polymer monomer, azo-bis-isobutyl cyanide, glycol dinitrate Base acrylate and n-hexane mixing, stir, form oil phase.Oil phase is added in aqueous phase again, is passed through nitrogen, by air Sealed after all cementing out, high-speed stirred, form homogeneous latex emulsion, reduced mixing speed and make its reaction a period of time, then With salt acid elution, filter and dry, obtain expandable microspheres foaming agent；
（2）By polypropylene, softening agent and step（1）The expandable microspheres foaming agent of gained is added in mill, at a certain temperature 5 ~ 10min is kneaded, is put into while hot in mould after slice, and is put into vulcanizing press, 5 ~ 10min is suppressed under high temperature, is opened rapidly Mould, after foaming body ejection, it is placed in cold water and shapes, you can obtains the polypropylene plastics of non-melt state foaming.
Preferably, step（1）In the aqueous phase protection liquid, the volumetric concentration of sodium hydroxide is 10 ~ 15g/L, and six are hydrated oxygen The volumetric concentration for changing magnesium be 5 ~ 10g/L, and the volumetric concentration of lauryl sodium sulfate is 3 ~ 5g/L, the volumetric concentration of sodium chloride is 5 ~ 10g/L,；
Preferably, step（1）Polymer monomer in the oil phase is acrylonitrile, styrene, EMA, methyl-prop E pioic acid methyl ester, methacrylic acid or n-butyl acrylate；
Preferably, step（1）In the oil phase, the addition of azo-bis-isobutyl cyanide is the 20 ~ 30% of monomer mass, ethylene glycol two The addition of methacrylate is the 5 ~ 10% of monomer mass, and the addition of n-hexane is the 3 ~ 6% of monomer mass；
Preferably, step（1）The oil phase and the mixed volume of aqueous phase ratio are 1:10~1:5；
Preferably, step（1）The mixing speed is 1000 ~ 1200r/min, and it will be 200 ~ 250r/ to be formed after stable emulsion min；
Preferably, step（1）The reaction temperature is 60 ~ 65 DEG C, and the reaction time is 20 ~ 24h；
Preferably, step（1）The drying temperature is 45 ~ 50 DEG C, and drying time is 20 ~ 24h；
Preferably, step（2）The softening agent be low molecule amount aliphatic hydrocarbon, aromatic hydrocarbon or chlorinated hydrocabon, as stearic acid, paraffin, Low-molecular-weight polystyrene, low molecular weight polyethylene wax etc.；
Preferably, step（2）The addition of the softening agent is the 5 ~ 10% of polypropylene quality；
Preferably, step（2）The addition of the expandable microspheres foaming agent is the 20 ~ 30% of polypropylene quality；
Preferably, step（2）The melting temperature is 100 ~ 110 DEG C, and press temperature is 140 ~ 150 DEG C.
In the forming process of microspheres, oil droplet monomer is stirred vigorously in aqueous phase, forms unstable oil droplet, then Under the protection of surfactant and inorganic dispersed particle, through coalescence and the scattered hanging drop for forming stabilization, reacted when reaching During temperature, in each drop in-situ polymerization occurs for monomer, triggers through chain, the formation polymerization such as chain increases, chain tra nsfer and chain termination Thing.Because polymer is incompatible with foaming agent, the hydrophily of polymer is more preferable, then during the course of the reaction, polymer wrapped hair Infusion forms core shell structure.In course of reaction, the amount and mixing speed of dispersant can not be too low, otherwise easily form bulky grain or block Shape thing.After expandable microspheres mix with polypropylene, as the rise of temperature, shell softening, inner vapor pressure increase, microsphere volume become Greatly, the thickness of polymer shell diminishes, until rupture, its internal foaming agent all escapes, and realizes to polyacrylic foaming.It is right After polypropylene is softened, its softening point should be reached and be less than at least 20 DEG C of fusing point, effective control in blowing temperature section could be realized System.If foaming effect is poor, it is possible the reason for have it is following：First, microspherulite diameter is too small, polymer shell is thicker, it is necessary to more High temperature can just make microsphere expansion；Second, foaming agent is very little；Third, microballoon shell thermoplasticity is big, shell has ductility, makes It is difficult to rupture release foaming agent.To avoid above mentioned problem, answer reasonable selection polymerized monomer, initiator, crosslinking agent, foaming agent and It is matched.
The invention provides a kind of method of non-melt state expanded polypropylene plastics, compared with prior art, what it was protruded Feature and excellent effect are：
1. the preparation method of the present invention avoids the problem of melt strength of polypropylene low strap comes, as the steep that wall in foaming process is broken Split, gas is escaped, abscess caves in or bubble merges；
2. the preparation method of the present invention avoids is heated at high temperature the step of melting to polypropylene, energy consumption is reduced, has saved production Cost；
3. the foaming method that the present invention uses, foam characteristics are stable, and abscess-size is controllable, can obtain the polypropylene bubble of hole-closing structure Foam plastics；
4. the method that the present invention uses, repeatability is high, easy to operate, and industrialized production can be achieved.
Embodiment
Below by way of embodiment, the present invention is described in further detail, but this should not be interpreted as to the present invention Scope be only limitted to following example.In the case where not departing from above method thought of the present invention, according to ordinary skill The various replacements or change that knowledge and customary means are made, should be included in the scope of the present invention.
Embodiment 1
A kind of method of non-melt state expanded polypropylene plastics, the preparation of its expandable microspheres and the non-melt foaming of polypropylene it is specific Process is as follows：
100L water, 12g sodium hydroxides, the hydrated magnesiums of 5g six, 5g lauryl sodium sulfate and 10g sodium chloride are added into agitator In, it is stirred vigorously with 1000r/min speed, forms stable aqueous phase protection liquid.Then by 10kg acrylonitrile, 20g azos two Isobutyl cyanogen, 7g ethylene glycol dimethacrylates and the mixing of 4g n-hexanes, stir, form oil phase.Oil phase is added to again In aqueous phase, the mixed volume ratio of oil phase and aqueous phase is 1:10, then nitrogen is passed through, sealed after air is all cemented out, with 1200r/min speed high-speed stirred, homogeneous latex emulsion is formed, reduce mixing speed to 200r/min, and make it at 60 DEG C, instead 20h is answered, then with salt acid elution, filtering, and the dry 24h at 45 DEG C, obtains expandable microspheres foaming agent；Again by 10kg poly- third Alkene, 0.5kg stearic acid and 2.5kg expandable microspheres foaming agent are added in mill, and 5min, slice are kneaded at a temperature of 110 DEG C It is put into mould, and is put into vulcanizing press while hot afterwards, 10min is suppressed at a high temperature of 140 DEG C, rapid die sinking, foaming body bullet After going out, it is placed in cold water and shapes, you can obtains the polypropylene plastics of non-melt state foaming.
The expanded polypropylene plastics obtained to embodiment 1, determine its coefficient of foaming, range of cell sizes, obtained data As shown in table 1.
Embodiment 2
A kind of method of non-melt state expanded polypropylene plastics, the preparation of its expandable microspheres and the non-melt foaming of polypropylene it is specific Process is as follows：
100L water, 10g sodium hydroxides, the hydrated magnesiums of 8g six, 3g lauryl sodium sulfate and 7g sodium chloride are added into agitator In, it is stirred vigorously with 1200r/min speed, forms stable aqueous phase protection liquid.Then by 10kg styrene, 25g azos two Isobutyl cyanogen, 8g ethylene glycol dimethacrylates and the mixing of 3g n-hexanes, stir, form oil phase.Oil phase is added to again In aqueous phase, the mixed volume ratio of oil phase and aqueous phase is 1:8, then nitrogen is passed through, sealed after air is all cemented out, with 1100r/min speed high-speed stirred, homogeneous latex emulsion is formed, reduce mixing speed to 230r/min, and make it at 60 DEG C, instead 24h is answered, then with salt acid elution, filtering, and the dry 20h at 50 DEG C, obtains expandable microspheres foaming agent；Again by 10kg poly- third Alkene, 1kg low molecular weight polyethylenes wax and 3kg expandable microspheres foaming agent are added in mill, are kneaded at a temperature of 100 DEG C 8min, it is put into mould after slice, and is put into vulcanizing press while hot, 8min is suppressed at a high temperature of 150 DEG C, rapid die sinking, After foaming body ejection, it is placed in cold water and shapes, you can obtains the polypropylene plastics of non-melt state foaming.
The expanded polypropylene plastics obtained to embodiment 2, determine its coefficient of foaming, range of cell sizes, obtained data As shown in table 1.
Embodiment 3
A kind of method of non-melt state expanded polypropylene plastics, the preparation of its expandable microspheres and the non-melt foaming of polypropylene it is specific Process is as follows：
100L water, 15g sodium hydroxides, the hydrated magnesiums of 5g six, 4g lauryl sodium sulfate and 10g sodium chloride are added into agitator In, it is stirred vigorously with 1000r/min speed, forms stable aqueous phase protection liquid.Then by 10kg EMAs, 30g azo-bis-isobutyl cyanides, 5g ethylene glycol dimethacrylates and the mixing of 5g n-hexanes, stir, form oil phase.Again by oil It is added in aqueous phase, the mixed volume ratio of oil phase and aqueous phase is 1:6, then nitrogen is passed through, air is all cemented out rear close Envelope, with 1100r/min speed high-speed stirred, homogeneous latex emulsion is formed, reduce mixing speed to 210r/min, and make it at 65 DEG C Under, 20h is reacted, then with salt acid elution, filtering, and the dry 20h at 50 DEG C, obtains expandable microspheres foaming agent；Again by 10kg Polypropylene, 0.8kg low molecular weight polyethylenes wax and 2kg expandable microspheres foaming agent are added in mill, are mixed at a temperature of 110 DEG C 7min is refined, is put into while hot in mould after slice, and is put into vulcanizing press, 10min is suppressed at a high temperature of 140 DEG C, is opened rapidly Mould, after foaming body ejection, it is placed in cold water and shapes, you can obtains the polypropylene plastics of non-melt state foaming.
The expanded polypropylene plastics obtained to embodiment 3, determine its coefficient of foaming, range of cell sizes, obtained data As shown in table 1.
Embodiment 4
A kind of method of non-melt state expanded polypropylene plastics, the preparation of its expandable microspheres and the non-melt foaming of polypropylene it is specific Process is as follows：
100L water, 10g sodium hydroxides, the hydrated magnesiums of 7g six, 4g lauryl sodium sulfate and 8g sodium chloride are added into agitator In, it is stirred vigorously with 1000r/min speed, forms stable aqueous phase protection liquid.Then by 10kg methyl methacrylates, 25g azo-bis-isobutyl cyanides, 6g ethylene glycol dimethacrylates and the mixing of 4g n-hexanes, stir, form oil phase.Again by oil It is added in aqueous phase, the mixed volume ratio of oil phase and aqueous phase is 1:5, then nitrogen is passed through, air is all cemented out rear close Envelope, with 1200r/min speed high-speed stirred, homogeneous latex emulsion is formed, reduce mixing speed to 220r/min, and make it at 65 DEG C Under, 20h is reacted, then with salt acid elution, filtering, and the dry 24h at 45 DEG C, obtains expandable microspheres foaming agent；Again by 10kg Polypropylene, 0.6kg low-molecular-weight polystyrenes and 2.5kg expandable microspheres foaming agent are added in mill, at a temperature of 110 DEG C 5min is kneaded, is put into while hot in mould after slice, and is put into vulcanizing press, 10min is suppressed at a high temperature of 140 DEG C, rapidly Die sinking, after foaming body ejection, it is placed in cold water and shapes, you can obtains the polypropylene plastics of non-melt state foaming.
The expanded polypropylene plastics obtained to embodiment 4, determine its coefficient of foaming, range of cell sizes, obtained data As shown in table 1.
Embodiment 5
A kind of method of non-melt state expanded polypropylene plastics, the preparation of its expandable microspheres and the non-melt foaming of polypropylene it is specific Process is as follows：
100L water, 13g sodium hydroxides, the hydrated magnesiums of 6g six, 5g lauryl sodium sulfate and 7g sodium chloride are added into agitator In, it is stirred vigorously with 1200r/min speed, forms stable aqueous phase protection liquid.Then it is 10kg methacrylic acids, 20g is even The isobutyl cyanogen of nitrogen two, 8g ethylene glycol dimethacrylates and the mixing of 6g n-hexanes, stir, form oil phase.Oil phase is added again Enter into aqueous phase, the mixed volume ratio of oil phase and aqueous phase is 1:10, then nitrogen is passed through, sealed after air is all cemented out, With 1000r/min speed high-speed stirred, homogeneous latex emulsion is formed, reduces mixing speed to 220r/min, and makes it at 62 DEG C, 22h is reacted, then with salt acid elution, filtering, and the dry 23h at 48 DEG C, obtains expandable microspheres foaming agent；Again by 10kg poly- third Alkene, 1kg low-molecular-weight polystyrenes and 2kg expandable microspheres foaming agent are added in mill, are kneaded at a temperature of 100 DEG C 10min, it is put into mould after slice, and is put into vulcanizing press while hot, 5min is suppressed at a high temperature of 150 DEG C, rapid die sinking, After foaming body ejection, it is placed in cold water and shapes, you can obtains the polypropylene plastics of non-melt state foaming.
The expanded polypropylene plastics obtained to embodiment 5, determine its coefficient of foaming, range of cell sizes, obtained data As shown in table 1.
Embodiment 6
A kind of method of non-melt state expanded polypropylene plastics, the preparation of its expandable microspheres and the non-melt foaming of polypropylene it is specific Process is as follows：
100L water, 14g sodium hydroxides, the hydrated magnesiums of 8g six, 3g lauryl sodium sulfate and 6g sodium chloride are added into agitator In, it is stirred vigorously with 1000r/min speed, forms stable aqueous phase protection liquid.Then it is 10kg methacrylic acids, 30g is even The isobutyl cyanogen of nitrogen two, 5g ethylene glycol dimethacrylates and the mixing of 5g n-hexanes, stir, form oil phase.Oil phase is added again Enter into aqueous phase, the mixed volume ratio of oil phase and aqueous phase is 1:5, then nitrogen is passed through, sealed after air is all cemented out, with 1100r/min speed high-speed stirred, homogeneous latex emulsion is formed, reduce mixing speed to 240r/min, and make it at 60 DEG C, instead 24h is answered, then with salt acid elution, filtering, and the dry 24h at 45 DEG C, obtains expandable microspheres foaming agent；Again by 10kg poly- third Alkene, 0.8kg stearic acid and 3kg expandable microspheres foaming agent are added in mill, are kneaded 10min at a temperature of 100 DEG C, after slice It is put into mould, and is put into vulcanizing press while hot, 10min is suppressed at a high temperature of 140 DEG C, rapid die sinking, foaming body ejection Afterwards, it is placed in cold water and shapes, you can obtains the polypropylene plastics of non-melt state foaming.
The expanded polypropylene plastics obtained to embodiment 6, determine its coefficient of foaming, range of cell sizes, obtained data As shown in table 1.
Embodiment 7
A kind of method of non-melt state expanded polypropylene plastics, the preparation of its expandable microspheres and the non-melt foaming of polypropylene it is specific Process is as follows：
100L water, 15g sodium hydroxides, the hydrated magnesiums of 5g six, 3g lauryl sodium sulfate and 10g sodium chloride are added into agitator In, it is stirred vigorously with 1200r/min speed, forms stable aqueous phase protection liquid.Then by 10kg n-butyl acrylates, 30g Azo-bis-isobutyl cyanide, 10g ethylene glycol dimethacrylates and the mixing of 4g n-hexanes, stir, form oil phase.Again by oil phase It is added in aqueous phase, the mixed volume ratio of oil phase and aqueous phase is 1:8, then nitrogen is passed through, sealed after air is all cemented out, With 1200r/min speed high-speed stirred, homogeneous latex emulsion is formed, reduces mixing speed to 250r/min, and makes it at 65 DEG C, 20h is reacted, then with salt acid elution, filtering, and the dry 20h at 50 DEG C, obtains expandable microspheres foaming agent；Again by 10kg poly- third Alkene, 0.6kg stearic acid and 2.8kg expandable microspheres foaming agent are added in mill, and 7min, slice are kneaded at a temperature of 110 DEG C It is put into mould, and is put into vulcanizing press while hot afterwards, 7min is suppressed at a high temperature of 150 DEG C, rapid die sinking, foaming body ejection Afterwards, it is placed in cold water and shapes, you can obtains the polypropylene plastics of non-melt state foaming.
The expanded polypropylene plastics obtained to embodiment 7, determine its coefficient of foaming, range of cell sizes, obtained data As shown in table 1.
Table 1：
Specific embodiment Coefficient of foaming（Times） Range of cell sizes（mm）
Embodiment 1 33.5 0.80~1.12
Embodiment 2 32.6 0.65~0.98
Embodiment 3 35.7 0.74~0.89
Embodiment 4 32.4 0.83~0.95
Embodiment 5 35.7 0.82~0.96
Embodiment 6 34.8 0.88~1.04
Embodiment 7 32.9 0.91~1.14

Claims (9)

  1. A kind of 1. method of non-melt state expanded polypropylene plastics, it is characterised in that polypropylene is not sent out in the molten state Bubble；First polypropylene is softened with appropriate low molecule amount aliphatic hydrocarbon, aromatic hydrocarbon or chlorinated hydrocabon, using expandable microspheres as hair Infusion, it is evenly dispersed into foaming system；Then foaming system is suitably heated up, the hydrocarbon blowing agents in expandable microspheres Gasification, microballoon expand, and obtain PP foam material；What is prepared comprises the following steps that：
    （1）Water, sodium hydroxide, six hydrated magnesiums, lauryl sodium sulfate and sodium chloride are added in agitator in proportion, it is acute Strong stirring, form stable aqueous phase protection liquid；Then by a certain amount of polymer monomer, azo-bis-isobutyl cyanide, glycol dinitrate Base acrylate and n-hexane mixing, stir, form oil phase；Oil phase is added in aqueous phase again, is passed through nitrogen, by air Sealed after all cementing out, high-speed stirred, form homogeneous latex emulsion, reduced mixing speed and make its reaction a period of time, then With salt acid elution, filter and dry, obtain expandable microspheres foaming agent；
    （2）By polypropylene, softening agent and step（1）The expandable microspheres foaming agent of gained is added in mill, at a certain temperature 5 ~ 10min is kneaded, is put into while hot in mould after slice, and is put into vulcanizing press, 5 ~ 10min is suppressed under high temperature, is opened rapidly Mould, after foaming body ejection, it is placed in cold water and shapes, you can obtains the polypropylene plastics of non-melt state foaming.
  2. A kind of 2. method of non-melt state expanded polypropylene plastics according to claim 1, it is characterised in that：Step（1）Institute To state in aqueous phase protection liquid, the volumetric concentration of sodium hydroxide is 10 ~ 15g/L, and the volumetric concentration of six hydrated magnesiums is 5 ~ 10g/L, The volumetric concentration of lauryl sodium sulfate is 3 ~ 5g/L, and the volumetric concentration of sodium chloride is 5 ~ 10g/L.
  3. A kind of 3. method of non-melt state expanded polypropylene plastics according to claim 1, it is characterised in that：Step（1）Institute The polymer monomer stated in oil phase is acrylonitrile, styrene, EMA, methyl methacrylate, methacrylic acid Or n-butyl acrylate.
  4. A kind of 4. method of non-melt state expanded polypropylene plastics according to claim 1, it is characterised in that：Step（1）Institute State in oil phase, the addition of azo-bis-isobutyl cyanide is the 20 ~ 30% of monomer mass, the addition of ethylene glycol dimethacrylate For the 5 ~ 10% of monomer mass, the addition of n-hexane is the 3 ~ 6% of monomer mass.
  5. A kind of 5. method of non-melt state expanded polypropylene plastics according to claim 1, it is characterised in that：Step（1）Institute The mixed volume ratio for stating oil phase and aqueous phase is 1:10~1:5.
  6. A kind of 6. method of non-melt state expanded polypropylene plastics according to claim 1, it is characterised in that：Step（1）Institute It is 1000 ~ 1200r/min to state mixing speed, and it will be 200 ~ 250r/min to be formed after stable emulsion；The reaction temperature is 60 ~ 65 DEG C, the reaction time is 20 ~ 24h；The drying temperature is 45 ~ 50 DEG C, and drying time is 20 ~ 24h.
  7. A kind of 7. method of non-melt state expanded polypropylene plastics according to claim 1, it is characterised in that：Step（2）Institute Softening agent is stated as one kind in stearic acid, paraffin, low-molecular-weight polystyrene, low molecular weight polyethylene wax.
  8. A kind of 8. method of non-melt state expanded polypropylene plastics according to claim 1, it is characterised in that：Step（2）Institute The addition for stating softening agent is the 5 ~ 10% of polypropylene quality.
  9. A kind of 9. method of non-melt state expanded polypropylene plastics according to claim 1, it is characterised in that：Step（2）Institute The addition for stating expandable microspheres foaming agent is the 20 ~ 30% of polypropylene quality；The melting temperature is 100 ~ 110 DEG C, press temperature For 140 ~ 150 DEG C.
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