CN107685413A - A kind of method by low temperature microspheres expanded polypropylene plastics - Google Patents
A kind of method by low temperature microspheres expanded polypropylene plastics Download PDFInfo
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- CN107685413A CN107685413A CN201710727662.2A CN201710727662A CN107685413A CN 107685413 A CN107685413 A CN 107685413A CN 201710727662 A CN201710727662 A CN 201710727662A CN 107685413 A CN107685413 A CN 107685413A
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- low temperature
- microspheres
- polypropylene
- expanded polypropylene
- polypropylene plastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3415—Heating or cooling
- B29C44/3426—Heating by introducing steam in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/60—Measuring, controlling or regulating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention belongs to the preparing technical field of polypropylene foam, there is provided a kind of method by low temperature microspheres expanded polypropylene plastics.This method reduces polyacrylic softening point by using plasticizer and liquid softening agent, it is mixed with low temperature microspheres, through high speed shear and is involved in air, forms preliminary foams.Then microspheres volumetric expansion is heated by saturated vapor at a lower temperature, produces foamed gas, so as to which polypropylene foam be made.Compared with conventional method, the invention reduce it is polypropylene expanded during steep that wall rupture, gas escape, abscess caves in and bubble merges, and steam heating energy consumption is small, and reusable edible, environmental benefit is good.
Description
Technical field
The invention belongs to the preparing technical field of polypropylene foam, there is provided a kind of by low temperature microspheres foaming poly- third
The method of alkene 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.
Polypropylene is with propylene（CH3—CH=CH2）For monomer, the high molecular polymer obtained by sudden reaction, its is anti-
It is to complete moment to answer feature one, second, no micromolecular compound is supervened.It can be obtained using ziegler-natta catalyst
To the crystallinity PP of HMW.According to-CH3 groups spatial arrangement rule, PP points be isotactic, rule and random three kinds
Polymer.The only high PP of isotacticity could generate good crystal region, could have the premium properties required for us.Isotactic
Polyacrylic crystal habit has α, β, γ, δ and intends five kinds of six side, most commonly α crystalline state, belongs to monoclinic system.α crystalline state is 138
DEG C or so formed, its fusing point be 180 DEG C.Intend six side's states and be also para crystalline structure, be called smectic liquid crystal.When the isotactic PP quilts of molten state
When being chilled to less than 70 DEG C, or carrying out below 70 DEG C cold stretch, it will generate and intend six side's state crystal, now PP hardness and just
Property reduce, and impact strength and the transparency improve.The crystal that isotactic PP is formed when gradually being cooled down from molten condition is spherocrystal, crystallization
Temperature is higher, and spherocrystal is bigger, otherwise spherocrystal is smaller.Spherocrystal is bigger, and performance is more crisp, and spherocrystal size directly influences rushing for PP materials
Hit intensity.In crystalline plasticses, crystallinity is maximum to the performance impact of material.Crystallinity is that crystalline portion weight accounts in material
The percentage of material gross weight.PP crystallinity can determine its density to ask by using the density gradient column of water-ethanol system
.
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.Obtain high quality at present
PP foam material technological means, mainly around be improve PP melt strength, including grafting, it is cross-linking modified and blending
The means such as modified.
The content of the invention
For drawbacks described above, the purpose of the present invention is to propose to a kind of side by low temperature microspheres expanded polypropylene plastics
Method, plasticizer, liquid softening agent, low temperature microspheres etc. are added in polypropylene powder first, in high-shear emulsion machine
In uniformly mixing after sticky system is made；Then under strong shear agitation effect, be involved in system air formed it is preliminary
Foams；Finally preliminary foams are placed in mould, it heated with high temperature saturated vapor, internal expandable microspheres heated body
Product expansion forms abscess, and polypropylene foam is made after cooling and solidifying.It is smaller using powdered polypropylene particle diameter, beneficial to by being plasticized
Foamed after the softening such as agent, and heating is carried out using saturated vapor and reduces energy consumption, there is environment protection significance.
A kind of method by low temperature microspheres expanded polypropylene plastics of the invention, can solve high temperature fused state hair
The probability of happening for phenomena such as steep that wall is ruptured during bubble, gas is escaped, abscess caves in and bubble merges.
Concrete technical scheme of the present invention is as follows：
A kind of method by low temperature microspheres expanded polypropylene plastics, polypropylene is reduced using plasticizer and liquid softening agent
Softening point, it is mixed with low temperature microspheres, through high speed shear and be involved in air, form preliminary foams；Then lead to
Supersaturated vapor, which heats, causes microspheres volumetric expansion, produces foamed gas, so as to which polypropylene foam, specific steps be made
It is as follows：
（1）Plasticizer, liquid softening agent and low temperature microspheres are added in polypropylene powder in certain mass ratio, added
Enter in high-shear emulsion machine, adjust rotor speed, open motor, material is uniformly mixed, sticky system is made.Meanwhile
Under strong shear agitation effect, air is involved in system, forms preliminary foams；
（2）By step（1）The preliminary foams of gained are placed in mould, are passed through high temperature saturated vapor and it is heated, control
Steam pressure within the specific limits, be heated, volumetric expansion by its internal expandable microspheres, and foaming agent, which decomposes, produces gas, forms bubble
Hole, polyacrylic rapid spatial expansion are full of mould, after foam ejection pending, polypropylene foam are obtained after cooling and solidifying.
Preferably, step（1）The plasticizer is phthalic acid two（2- ethyl hexyls）Ester, di-n-octyl phthalate
Or dicyclohexyl phthalate；
Preferably, step（1）The liquid softening agent is coal tar, pine tar, coal tar pitch or rosin；
Preferably, step（1）The low temperature microspheres are the nucleocapsid structure of polymer shell encapsulated blowing agent composition
Grain, it originates blowing temperature and is no more than 120 DEG C；
Preferably, step（1）The particle diameter of the polypropylene powder is 20 ~ 40 μm；
Preferably, step（1）The addition of the plasticizer is the 8 ~ 10% of polypropylene powder quality；
Preferably, step（1）The addition of the liquid softening agent is the 10 ~ 15% of polypropylene powder quality；
Preferably, step（1）The addition of the low temperature microspheres is the 20 ~ 25% of polypropylene powder quality；
Preferably, step（1）The rotor speed is arranged to 2000 ~ 2500r/min；
Preferably, step（2）The temperature of the saturated vapor is 130 ~ 150 DEG C；
Preferably, step（2）The steam pressure of the foaming system is 0.25 ~ 0.3MPa
Generally, polyacrylic softening point and fusing point are very close to it is difficult to flowing before its melting under high temperature, it is difficult to process.After melting,
Melt strength drastically declines, and makes to be difficult in foaming to coat foamed gas so that and gas escapes, and due to the reduction of melt strength,
Foam cell walls easily collapse, it is difficult to form stable vesicular texture.Therefore, polyacrylic conventional blowing temperature section is very narrow,
It is unmanageable.In order to expand its blowing temperature section, using plasticizer and liquid softening agent, its Chain Flexibility is improved, is reduced
Crystallinity, make the reduction of its softening point.In the presence of high-shear emulsion machine, it can stir to form sticky system.In sticky system
Low temperature microspheres are introduced, its shell is polymethyl methacrylate or polyethyl methacrylate film, and kernel is carbonic acid
Hydrogen sodium particle.When being passed through high temperature saturated vapor to sticky system, low temperature microspheres expanded by heating, internal sodium acid carbonate point
Solution produces carbon dioxide and escaped, and promotes polypropylene expanded, formation even structure, the foaming body of uniform pore diameter.And polypropylene is not
Melting, so as to overcome the defects of melt strength the is difficult to foaming.Because when forming sticky system, strong shear action makes
Partial air is involved in, and forms preliminary foaming body, and therefore, after heating, follow-up foaming process is very fast, and production efficiency substantially carries
It is high.
The invention provides a kind of method by low temperature microspheres expanded polypropylene plastics, compared with prior art,
The characteristics of it is protruded and excellent effect are：
1. the method that the present invention prepares polypropylene foam, by the way that polypropylene is plastified, carried out under the conditions of less than its melting temperature
Foaming, the generation for effectively reducing phenomena such as steep that wall in foaming process is ruptured, gas is escaped, abscess caves in and bubble merges are general
Rate.
2. polypropylene foam prepared by the present invention, antidetonation energy absorption performance and heat-proof quality are good, and deformation-recovery rate is higher, resistance to
Oil and chemical resistance are good, and light weight, application field are wide.
3. the present invention is heated using saturated vapor, to realize the volumetric expansion of microspheres, foamed gas, the party are produced
Method energy consumption is small, and steam reusable edible, has good environment friendly.
4. the plasticizer and liquid softening agent that are used in the present invention, cost is relatively low, and preparation technology is simple, and scale can be achieved
Production.
5. in the preparation process of the present invention, preliminary foaming body is formed because intensive shear introduces air, therefore, after heating,
Follow-up foaming process is very fast, and production efficiency significantly improves.
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 by low temperature microspheres expanded polypropylene plastics, it is as follows that it prepares the detailed process of expanded polypropylene：
With 0.8kg phthalic acids two（2- ethyl hexyls）Ester is plasticizer, using 1.5kg coal tar pitch as liquid softening agent, is risen with 2kg
Beginning blowing temperature is no more than 120 DEG C of low temperature microspheres（Using polymethyl methacrylate as shell, sodium acid carbonate is of core
Grain）, it is in 20 ~ 40 μm of polypropylene powder to be added to 10kg particle diameters, is added in high-shear emulsion machine, regulation rotor speed to
2500r/min, motor is opened, material is uniformly mixed, sticky system is made.Meanwhile acted in strong shear agitation
Under, air is involved in system, forms preliminary foams；The preliminary foams of gained are placed in mould, are passed through 130 DEG C
High temperature saturated vapor is heated to it, and it is 0.3MPa to control steam pressure, and its internal expandable microspheres is heated, volumetric expansion,
Foaming agent, which decomposes, produces gas, forms abscess, and polyacrylic rapid spatial expansion is full of mould, after foam ejection pending, cooling
Polypropylene foam is obtained after solidification.
The polypropylene foam obtained to embodiment 1, its mechanical property is tested, obtained compressive strength, notch impact strength
As shown in table 1；Its density is tested, obtained data are as shown in table 1.
Embodiment 2
A kind of method by low temperature microspheres expanded polypropylene plastics, it is as follows that it prepares the detailed process of expanded polypropylene：
Using 1kg di-n-octyl phthalates as plasticizer, using 1kg pine tars as liquid softening agent, with 2.5kg originate foaming temperature
Low temperature microspheres of the degree no more than 120 DEG C（Using polymethyl methacrylate as shell, sodium acid carbonate is the particle of core）, addition
In the polypropylene powder for being 20 ~ 40 μm to 10kg particle diameters, add in high-shear emulsion machine, regulation rotor speed to 2200r/min,
Motor is opened, material is uniformly mixed, sticky system is made.Meanwhile under strong shear agitation effect, rolled up in system
Enter air, form preliminary foams；The preliminary foams of gained are placed in mould, 140 DEG C of high temperature saturation is passed through and steams
Vapour is heated to it, and it is 0.3MPa to control steam pressure, and its internal expandable microspheres is heated, and volumetric expansion, foaming agent decomposes
Gas is produced, forms abscess, polyacrylic rapid spatial expansion is full of mould, after foam ejection pending, obtained after cooling and solidifying
Polypropylene foam.
The polypropylene foam obtained to embodiment 2, its mechanical property is tested, obtained compressive strength, notch impact strength
As shown in table 1；Its density is tested, obtained data are as shown in table 1.
Embodiment 3
A kind of method by low temperature microspheres expanded polypropylene plastics, it is as follows that it prepares the detailed process of expanded polypropylene：
With 0.9kg phthalic acids two（2- ethyl hexyls）Ester is plasticizer, using 1.2kg coal tar as liquid softening agent, with 2.2kg
Originate the low temperature microspheres that blowing temperature is no more than 120 DEG C（Using polymethyl methacrylate as shell, sodium acid carbonate is core
Particle）, it is added in the polypropylene powder that 10Xkg particle diameters are 20 ~ 40 μm, adds in high-shear emulsion machine, adjusts rotor speed
To 2000r/min, motor is opened, material is uniformly mixed, sticky system is made.Meanwhile make in strong shear agitation
Under, air is involved in system, forms preliminary foams；The preliminary foams of gained are placed in mould, are passed through 150 DEG C
High temperature saturated vapor it is heated, it is 0.27MPa to control steam pressure, and its internal expandable microspheres is heated, and volume is swollen
Swollen, foaming agent, which decomposes, produces gas, forms abscess, polyacrylic rapid spatial expansion is full of mould, cold after foam ejection pending
But polypropylene foam is obtained after solidifying.
The polypropylene foam obtained to embodiment 3, its mechanical property is tested, obtained compressive strength, notch impact strength
As shown in table 1；Its density is tested, obtained data are as shown in table 1.
Embodiment 4
A kind of method by low temperature microspheres expanded polypropylene plastics, it is as follows that it prepares the detailed process of expanded polypropylene：
Using 1kg dicyclohexyl phthalates as plasticizer, using 1.3kg rosin as liquid softening agent, with 2.4kg originate foaming temperature
Low temperature microspheres of the degree no more than 120 DEG C（Using polymethyl methacrylate as shell, sodium acid carbonate is the particle of core）, addition
In the polypropylene powder for being 20 ~ 40 μm to 10kg particle diameters, add in high-shear emulsion machine, regulation rotor speed to 2300r/min,
Motor is opened, material is uniformly mixed, sticky system is made.Meanwhile under strong shear agitation effect, rolled up in system
Enter air, form preliminary foams；The preliminary foams of gained are placed in mould, 135 DEG C of high temperature saturation is passed through and steams
Vapour is heated to it, and it is 0.28MPa to control steam pressure, and its internal expandable microspheres is heated, and volumetric expansion, foaming agent decomposes
Gas is produced, forms abscess, polyacrylic rapid spatial expansion is full of mould, after foam ejection pending, obtained after cooling and solidifying
Polypropylene foam.
The polypropylene foam obtained to embodiment 4, its mechanical property is tested, obtained compressive strength, notch impact strength
As shown in table 1；Its density is tested, obtained data are as shown in table 1.
Embodiment 5
A kind of method by low temperature microspheres expanded polypropylene plastics, it is as follows that it prepares the detailed process of expanded polypropylene：
Using 0.8kg di-n-octyl phthalates as plasticizer, using 1.5kg coal tar pitch as liquid softening agent, with 2kg originate foam
Temperature is no more than 120 DEG C of low temperature microspheres（Using polymethyl methacrylate as shell, sodium acid carbonate is the particle of core）, add
It is added in the polypropylene powder that 10kg particle diameters are 20 ~ 40 μm, adds in high-shear emulsion machine, regulation rotor speed to 2500r/
Min, motor is opened, material is uniformly mixed, sticky system is made.Meanwhile under strong shear agitation effect, system
In be involved in air, form preliminary foams；The preliminary foams of gained are placed in mould, 130 DEG C of height is passed through and has enough to eat and wear
It is heated with steam, it is 0.3MPa to control steam pressure, and its internal expandable microspheres is heated, volumetric expansion, foaming agent
Decompose and produce gas, form abscess, polyacrylic rapid spatial expansion is full of mould, after foam ejection pending, after cooling and solidifying
Obtain polypropylene foam.
The polypropylene foam obtained to embodiment 5, its mechanical property is tested, obtained compressive strength, notch impact strength
As shown in table 1；Its density is tested, obtained data are as shown in table 1.
Embodiment 6
A kind of method by low temperature microspheres expanded polypropylene plastics, it is as follows that it prepares the detailed process of expanded polypropylene：
With 0.8kg phthalic acids two（2- ethyl hexyls）Ester is plasticizer, using 1.2kg pine tars as liquid softening agent, with 2.5kg
Originate the low temperature microspheres that blowing temperature is no more than 120 DEG C（Using polymethyl methacrylate as shell, sodium acid carbonate is core
Particle）, it is in 20 ~ 40 μm of polypropylene powder to be added to 10kg particle diameters, is added in high-shear emulsion machine, regulation rotor speed to
2400r/min, motor is opened, material is uniformly mixed, sticky system is made.Meanwhile acted in strong shear agitation
Under, air is involved in system, forms preliminary foams；The preliminary foams of gained are placed in mould, are passed through 140 DEG C
High temperature saturated vapor is heated to it, and it is 0.26MPa to control steam pressure, and its internal expandable microspheres is heated, volumetric expansion,
Foaming agent, which decomposes, produces gas, forms abscess, and polyacrylic rapid spatial expansion is full of mould, after foam ejection pending, cooling
Polypropylene foam is obtained after solidification.
The polypropylene foam obtained to embodiment 6, its mechanical property is tested, obtained compressive strength, notch impact strength
As shown in table 1；Its density is tested, obtained data are as shown in table 1.
Embodiment 7
A kind of method by low temperature microspheres expanded polypropylene plastics, it is as follows that it prepares the detailed process of expanded polypropylene：
Using 0.9kg dicyclohexyl phthalates as plasticizer, using 1.4kg coal tar as liquid softening agent, with 2.3kg rise originate
Steep the low temperature microspheres that temperature is no more than 120 DEG C（Using polymethyl methacrylate as shell, sodium acid carbonate is the particle of core）,
It is added in the polypropylene powder that 10kg particle diameters are 20 ~ 40 μm, adds in high-shear emulsion machine, regulation rotor speed to 2000r/
Min, motor is opened, material is uniformly mixed, sticky system is made.Meanwhile under strong shear agitation effect, system
In be involved in air, form preliminary foams；The preliminary foams of gained are placed in mould, 130 DEG C of height is passed through and has enough to eat and wear
It is heated with steam, it is 0.3MPa to control steam pressure, and its internal expandable microspheres is heated, volumetric expansion, foaming agent
Decompose and produce gas, form abscess, polyacrylic rapid spatial expansion is full of mould, after foam ejection pending, after cooling and solidifying
Obtain polypropylene foam.
The polypropylene foam obtained to embodiment 7, its mechanical property is tested, obtained compressive strength, notch impact strength
As shown in table 1；Its density is tested, obtained data are as shown in table 1.
Table 1：
| Specific embodiment | Compressive strength（MPa） | Notch impact strength（J/m） | Density（kg/m3） |
| Embodiment 1 | 5.45 | 389 | 35 |
| Embodiment 2 | 5.68 | 368 | 42 |
| Embodiment 3 | 5.50 | 412 | 48 |
| Embodiment 4 | 5.62 | 357 | 36 |
| Embodiment 5 | 5.72 | 383 | 31 |
| Embodiment 6 | 5.69 | 392 | 37 |
| Embodiment 7 | 5.74 | 405 | 33 |
| Conventional hot melt expanded polypropylene | 1.42 | 205 | 61 |
Claims (10)
- A kind of 1. method by low temperature microspheres expanded polypropylene plastics, it is characterised in that soft using plasticizer and liquid Agent reduces polyacrylic softening point, it is mixed with low temperature microspheres, through high speed shear and is involved in air, is formed preliminary Foams；Then microspheres volumetric expansion is heated by saturated vapor, produces foamed gas, so as to which polypropylene be made Foam, preparation comprise the following steps that：（1）Plasticizer, liquid softening agent and low temperature microspheres are added in polypropylene powder in certain mass ratio, added Enter in high-shear emulsion machine, adjust rotor speed, open motor, material is uniformly mixed, sticky system is made；Meanwhile Under strong shear agitation effect, air is involved in system, forms preliminary foams；（2）By step（1）The preliminary foams of gained are placed in mould, are passed through high temperature saturated vapor and it is heated, control Steam pressure within the specific limits, be heated, volumetric expansion by its internal expandable microspheres, and foaming agent, which decomposes, produces gas, forms bubble Hole, polyacrylic rapid spatial expansion are full of mould, after foam ejection pending, polypropylene foam are obtained after cooling and solidifying.
- A kind of 2. method by low temperature microspheres expanded polypropylene plastics according to claim 1, it is characterised in that：Step Suddenly（1）The plasticizer is phthalic acid two（2- ethyl hexyls）Ester, di-n-octyl phthalate or the ring of phthalic acid two Own ester.
- A kind of 3. method by low temperature microspheres expanded polypropylene plastics according to claim 1, it is characterised in that：Step Suddenly（1）The liquid softening agent is coal tar, pine tar, coal tar pitch or rosin.
- A kind of 4. method by low temperature microspheres expanded polypropylene plastics according to claim 1, it is characterised in that：Step Suddenly（1）The low temperature microspheres are the core-shell particle of polymer shell encapsulated blowing agent composition, and it originates foaming temperature Degree is no more than 120 DEG C.
- A kind of 5. method by low temperature microspheres expanded polypropylene plastics according to claim 1, it is characterised in that：Step Suddenly（1）The particle diameter of the polypropylene powder is 20 ~ 40 μm.
- A kind of 6. method by low temperature microspheres expanded polypropylene plastics according to claim 1, it is characterised in that：Step Suddenly（1）The addition of the plasticizer is the 8 ~ 10% of polypropylene powder quality.
- A kind of 7. method by low temperature microspheres expanded polypropylene plastics according to claim 1, it is characterised in that：Step Suddenly（1）The addition of the liquid softening agent is the 10 ~ 15% of polypropylene powder quality.
- A kind of 8. method by low temperature microspheres expanded polypropylene plastics according to claim 1, it is characterised in that：Step Suddenly（1）The addition of the low temperature microspheres is the 20 ~ 25% of polypropylene powder quality.
- A kind of 9. method by low temperature microspheres expanded polypropylene plastics according to claim 1, it is characterised in that：Step Suddenly（1）The rotor speed is arranged to 2000 ~ 2500r/min.
- A kind of 10. method by low temperature microspheres expanded polypropylene plastics according to claim 1, it is characterised in that： Step（2）The temperature of the saturated vapor is 130 ~ 150 DEG C；The steam pressure of the foaming system is 0.25 ~ 0.3MPa.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724342A (en) * | 2019-10-21 | 2020-01-24 | 晋江瑞碧科技有限公司 | Micro-foaming polypropylene resin composition and preparation method and application thereof |
| CN111138814A (en) * | 2020-01-16 | 2020-05-12 | 快思瑞科技(上海)有限公司 | Light high-strength PBT (polybutylene terephthalate) material and preparation method thereof |
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| CN104245808A (en) * | 2012-03-30 | 2014-12-24 | 乐金华奥斯有限公司 | Foam sheet using polylactic acid having extended chain and method for preparing same |
| CN103589070A (en) * | 2013-11-27 | 2014-02-19 | 天津市普立泰高分子科技有限公司 | Physical-foaming polypropylene cable material and preparation method thereof |
| CN103709509A (en) * | 2013-12-17 | 2014-04-09 | 浙江普利特新材料有限公司 | Expandable microsphere filling modified polypropylene composite material and preparation method thereof |
| CN104031316A (en) * | 2014-06-09 | 2014-09-10 | 温州科力塑业有限公司 | Ultra-low density polypropylene composite material capable of being used for 3D printing and preparation method thereof. |
| CN105037920A (en) * | 2015-03-25 | 2015-11-11 | 银禧工程塑料（东莞）有限公司 | High-blackness polypropylene composition and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110724342A (en) * | 2019-10-21 | 2020-01-24 | 晋江瑞碧科技有限公司 | Micro-foaming polypropylene resin composition and preparation method and application thereof |
| CN111138814A (en) * | 2020-01-16 | 2020-05-12 | 快思瑞科技(上海)有限公司 | Light high-strength PBT (polybutylene terephthalate) material and preparation method thereof |
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