CN107685413B - A method of by low temperature microspheres expanded polypropylene plastics - Google Patents
A method of by low temperature microspheres expanded polypropylene plastics Download PDFInfo
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- CN107685413B CN107685413B CN201710727662.2A CN201710727662A CN107685413B CN 107685413 B CN107685413 B CN 107685413B CN 201710727662 A CN201710727662 A CN 201710727662A CN 107685413 B CN107685413 B CN 107685413B
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- low temperature
- microspheres
- polypropylene
- foam
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Classifications
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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 preparation technical fields of polypropylene foam, provide a kind of method by low temperature microspheres expanded polypropylene plastics.This method mixes it with low temperature microspheres, through high speed shear and is involved in air, forms preliminary foams by reducing polyacrylic softening point using plasticizer and liquid softening agent.Then it is heated at a lower temperature by saturated vapor so that microspheres volume expansion, generates foamed gas, so that polypropylene foam be made.Be compared with the traditional method, the invention reduce it is polypropylene expanded during steep that wall rupture, gas escape, abscess collapse and bubble merge, and steam heating energy consumption it is small, can be recycled, environmental benefit is good.
Description
Technical field
The invention belongs to the preparation technical fields of polypropylene foam, provide a kind of by low temperature microspheres foaming poly- third
The method of alkene plastics.
Background technique
Polypropylene (PP is the abbreviation of English Poly Propylene beginning letter) is to start nineteen fifties greatly
A kind of synthetic resin of production is measured, it is the copolymer of Noblen or propylene α-alkene (ethylene, butene-1, hexene -1),
The linear structure of its molecule, density is 0.89~0.91g/cm3, also lower than the density of low density polyethylene (LDPE).Since PP has phase
It is high to hardness, specific gravity 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 many advantages, such as fabulous injection molding performance, arbitrarily can stretch and orient, can with other materials blending and modifying, therefore PP apply
Range constantly expands, and demand growth is fastest in five big resins for universal use, has gradually replaced 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, and the high molecular polymer obtained by sudden reaction is anti-
Feature is answered first is that moment completes, second is that supervening without small molecule compound.It can be obtained using ziegler-natta catalyst
To the crystallinity PP of high molecular weight.According to-CH3 group spatial arrangement rule, PP points be isotactic, rule and three kinds random
Polymer.The only high PP of isotacticity could generate good crystal region, could have excellent performance required for us.Isotactic
Polyacrylic crystal habit has α, β, γ, δ and quasi- five kinds of six side, most commonly α crystalline state, belongs to monoclinic system.α crystalline state is 138
DEG C or so formed, fusing point be 180 DEG C.Quasi- six side's states are also para crystalline structure, are called smectic liquid crystal.When the isotactic PP quilt of molten state
Be chilled to 70 DEG C hereinafter, or in 70 DEG C or less progress cold stretch, quasi- six sides state crystal will be generated, at this time the hardness of PP and just
Property reduce, and impact strength and the transparency improve.The crystal that isotactic PP is formed when gradually cooling 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 material
Hit intensity.In crystalline plastics, crystallinity influences the performance of material maximum.Crystalline portion weight accounts in crystallinity, that is, material
The percentage of material total weight.The crystallinity of PP can measure its density by using water-ethanol system density gradient column to ask
?.
The PP of conventional method production is a kind of line style semicrystalline polymeric, the seldom branching of strand, molecular weight distribution phase
To relatively narrow, this cause its softening point and fusing point very close to.Before temperature reaches fusing point, it is not flowed substantially, when temperature is super
After crossing fusing point, melt strength sharply declines, and this melt is difficult to encase gas;In addition, polypropylene is changed into crystallization from molten state
State can release a large amount of heat, longer the time required to being solid by melt transform;In addition polypropylene air penetrability is high, and foamed gas is easy
Escape.Therefore it is narrow suitable for polypropylene expanded temperature range, foaming process is difficult to control, and easily causes steep that wall in foaming process broken
It splits, gas escape, abscess collapses and bubble merges.
EPP (Expanded Polypropylene) i.e. expanded polypropylene material, it is a kind of brilliant highly crystalline of performance
Type polymer/gas recombination material becomes fastest-rising environment-friendly novel resistance to compression buffering at present with its unique and superior performance
Heat-barrier material.EPP product has response rate height, good heat resistance, chemically-resistant after very excellent antidetonation energy absorption performance, deformation
Product, oil resistivity and thermal insulation;Meanwhile light weight, article quality can be greatly reduced;In addition, EPP or a kind of environmentally friendly material
Material is prone to β degradation, and PP foam, convenient for recycling, 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 becomes after polystyrene (EPS), polyurethane
(EPU), the novel foam material of application value and market potential is had more after polyethylene (EPE) foamed material.
The melt strength of PP is low, significantly limits 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;When extrusion foaming, micro-pore wall easily ruptures, foaming times
Rate is low.Thus to obtain the PP foam material of high quality, it is crucial for improving its melt strength.High quality is obtained at present
PP foam material technological means, mainly around be improve PP melt strength, including grafting, it is cross-linking modified and be blended
The means such as modified.
Summary of the invention
In view of the foregoing drawbacks, the purpose of the present invention is to propose to a kind of sides by low temperature microspheres expanded polypropylene plastics
Plasticizer, liquid softening agent, low temperature microspheres etc. are added in polypropylene powder, in high-shear emulsion machine by method first
In sticky system is made after evenly mixing；Then under strong shear agitation effect, be involved in system air formed it is preliminary
Foams；Finally preliminary foams are placed in mold, it is 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 partial size, conducive to by being plasticized
It foams 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 present invention can solve high temperature fused state hair
The probability of happening for phenomena such as steep that wall rupture, gas escape, abscess collapsing and bubble merge during bubble.
Specific technical solution of the present invention is as follows:
A method of by low temperature microspheres expanded polypropylene plastics, reduced using plasticizer and liquid softening agent poly-
The softening point of propylene mixes it with low temperature microspheres, through high speed shear and is involved in air, forms preliminary foams；So
It is heated by saturated vapor afterwards so that microspheres volume expansion, generates foamed gas, so that polypropylene foam is made, specifically
Steps are as follows:
(1) plasticizer, liquid softening agent and low temperature microspheres are added to polypropylene powder in certain mass ratio
In, it is added in high-shear emulsion machine, adjusts rotor speed, open driving motor, mix material uniformly, sticky system is made.
Meanwhile under strong shear agitation effect, it is involved in air in system, forms preliminary foams；
(2) the resulting preliminary foams of step (1) are placed in mold, are passed through high temperature saturated vapor and it is heated,
Control steam pressure in a certain range, internal expandable microspheres are heated, volume expansion, and foaming agent, which decomposes, generates gas, shape
At abscess, polyacrylic rapid spatial expansion is full of mold and obtains polypropylene foam after cooling and solidifying after foam pop-up pending.
Preferably, step (1) the plasticizer is phthalic acid two (2- ethyl hexyl) 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
Particle, starting blowing temperature are no more than 120 DEG C；
Preferably, the partial size of step (1) described polypropylene powder is 20 ~ 40 μm；
Preferably, the additional amount of step (1) the plasticizer is the 8 ~ 10% of polypropylene powder quality；
Preferably, the additional amount of step (1) the liquid softening agent is the 10 ~ 15% of polypropylene powder quality；
Preferably, the additional amount of step (1) the low temperature microspheres is the 20 ~ 25% of polypropylene powder quality；
Preferably, step (1) described rotor speed is set as 2000 ~ 2500r/min；
Preferably, the temperature of step (2) described saturated vapor is 130 ~ 150 DEG C；
Preferably, the steam pressure of step (2) described foaming system is 0.25 ~ 0.3MPa
In general, polyacrylic softening point and fusing point are very close to its melting is difficult to flow before under high temperature, it is difficult to process.It is molten
After melting, melt strength sharply declines, and makes to be difficult to coat foamed gas in foaming, so that gas escapes, and due to melt strength
It reduces, foam cell walls are easy to collapse, it is difficult to form stable vesicular texture.Therefore, polyacrylic conventional blowing temperature section
It is very narrow, it is difficult to control.In order to expand its blowing temperature section, using plasticizer and liquid softening agent, its Chain Flexibility is improved,
Crystallinity is reduced, the reduction of its softening point is made.Under the action of high-shear emulsion machine, it can stir to form sticky system.In viscous body
Low temperature microspheres are introduced in system, shell is polymethyl methacrylate or polyethyl methacrylate film, kernel are
Sodium bicarbonate particle.When being passed through high temperature saturated vapor to sticky system, low temperature microspheres expanded by heating, internal bicarbonate
Sodium decompose generate carbon dioxide simultaneously escape, promote it is polypropylene expanded, formed structure it is uniform, the foaming body of uniform pore diameter.And poly- third
Alkene does not melt, so that overcoming melt strength is difficult to the defect to foam.Since when forming sticky system, strong shearing is made
With partial air is involved in, preliminary foaming body is formd, therefore, after heating, subsequent foaming process is very fast, and production efficiency is obvious
It improves.
The present invention provides a kind of methods by low temperature microspheres expanded polypropylene plastics, compared with prior art,
Its feature protruded and excellent effect are:
1. the method that the present invention prepares polypropylene foam, by the way that polypropylene to be plasticized, under the conditions of being lower than its melting temperature
It foams, effectively reduces the generation for phenomena such as steep that wall rupture in foaming process, gas escape, abscess collapsing and bubble merge
Probability.
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 corrosion resistance are good, and light weight, application field are wide.
3. the present invention is heated using saturated vapor, to realize the volume expansion of microspheres, foamed gas, the party are generated
Method energy consumption is small, and steam is Ke Xunhuanliyong, has good environment friendly.
4. the plasticizer and liquid softening agent that use in the present invention, cost is relatively low, and preparation process is simple, it can be achieved that scale
Production.
5. in preparation process of the invention, preliminary foaming body is formed since intensive shear introduces air, after heating,
Subsequent foaming process is very fast, and production efficiency significantly improves.
Specific embodiment
In the following, the present invention will be further described in detail by way of specific embodiments, but this should not be interpreted as to the present invention
Range be only limitted to example below.Without departing from the idea of the above method 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 method of by low temperature microspheres expanded polypropylene plastics, preparing the detailed process of expanded polypropylene such as
Under:
Using (2- ethyl hexyl) ester of 0.8kg phthalic acid two as plasticizer, using 1.5kg coal tar pitch as liquid softening agent, with
2kg originates low temperature microspheres of the blowing temperature no more than 120 DEG C, and (using polymethyl methacrylate as shell, sodium bicarbonate is
The particle of core), it is added in the polypropylene powder that 10kg partial size is 20 ~ 40 μm, is added in high-shear emulsion machine, adjusts rotor and turn
Speed opens driving motor, mixes material uniformly, sticky system is made to 2500r/min.Meanwhile in strong shear agitation
Under effect, it is involved in air in system, forms preliminary foams；Resulting preliminary foams are placed in mold, are passed through 130
DEG C high temperature saturated vapor it is heated, control steam pressure is 0.3MPa, and internal expandable microspheres are heated, and volume is swollen
Swollen, foaming agent, which decomposes, generates gas, forms abscess, polyacrylic rapid spatial expansion is full of mold, cold after foam pop-up pending
But polypropylene foam is obtained after solidifying.
To the polypropylene foam that embodiment 1 obtains, 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 method of by low temperature microspheres expanded polypropylene plastics, preparing the detailed process of expanded polypropylene such as
Under:
Using 1kg di-n-octyl phthalate as plasticizer, using 1kg pine tar as liquid softening agent, with 2.5kg rise originate
Low temperature microspheres (using polymethyl methacrylate as shell, sodium bicarbonate be the particle of core) of the temperature no more than 120 DEG C are steeped,
It is added in the polypropylene powder that 10kg partial size is 20 ~ 40 μm, is added in high-shear emulsion machine, adjusts rotor speed to 2200r/
Min opens driving motor, mixes material uniformly, sticky system is made.Meanwhile under strong shear agitation effect, system
In be involved in air, form preliminary foams；Resulting preliminary foams are placed in mold, 140 DEG C of height is passed through and has enough to eat and wear
It is heated with steam, control steam pressure is 0.3MPa, and internal expandable microspheres are heated, volume expansion, foaming agent
It decomposes and generates gas, form abscess, polyacrylic rapid spatial expansion is full of mold, after foam pop-up pending, after cooling and solidifying
Obtain polypropylene foam.
To the polypropylene foam that embodiment 2 obtains, 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 method of by low temperature microspheres expanded polypropylene plastics, preparing the detailed process of expanded polypropylene such as
Under:
Using (2- ethyl hexyl) ester of 0.9kg phthalic acid two as plasticizer, using 1.2kg coal tar as liquid softening agent, with
2.2kg originate blowing temperature no more than 120 DEG C low temperature microspheres (using polymethyl methacrylate as shell, sodium bicarbonate
For the particle of core), it is added in the polypropylene powder that 10Xkg partial size is 20 ~ 40 μm, is added in high-shear emulsion machine, adjusts and turn
Rotor speed opens driving motor, mixes material uniformly, sticky system is made to 2000r/min.Meanwhile in strong shearing
Under stirring action, it is involved in air in system, forms preliminary foams；Resulting preliminary foams are placed in mold, are led to
Entering 150 DEG C of high temperature saturated vapor to heat it, control steam pressure is 0.27MPa, and internal expandable microspheres are heated,
Volume expansion, foaming agent, which decomposes, generates gas, forms abscess, and polyacrylic rapid spatial expansion is full of mold, foam bullet pending
After out, polypropylene foam is obtained after cooling and solidifying.
To the polypropylene foam that embodiment 3 obtains, 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 method of by low temperature microspheres expanded polypropylene plastics, preparing the detailed process of expanded polypropylene such as
Under:
Using 1kg dicyclohexyl phthalate as plasticizer, using 1.3kg rosin as liquid softening agent, with 2.4kg rise originate
Low temperature microspheres (using polymethyl methacrylate as shell, sodium bicarbonate be the particle of core) of the temperature no more than 120 DEG C are steeped,
It is added in the polypropylene powder that 10kg partial size is 20 ~ 40 μm, is added in high-shear emulsion machine, adjusts rotor speed to 2300r/
Min opens driving motor, mixes material uniformly, sticky system is made.Meanwhile under strong shear agitation effect, system
In be involved in air, form preliminary foams；Resulting preliminary foams are placed in mold, 135 DEG C of height is passed through and has enough to eat and wear
It is heated with steam, control steam pressure is 0.28MPa, and internal expandable microspheres are heated, volume expansion, foaming agent
It decomposes and generates gas, form abscess, polyacrylic rapid spatial expansion is full of mold, after foam pop-up pending, after cooling and solidifying
Obtain polypropylene foam.
To the polypropylene foam that embodiment 4 obtains, 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 method of by low temperature microspheres expanded polypropylene plastics, preparing the detailed process of expanded polypropylene such as
Under:
Using 0.8kg di-n-octyl phthalate as plasticizer, using 1.5kg coal tar pitch as liquid softening agent, with 2kg originate
(using polymethyl methacrylate as shell, sodium bicarbonate is of core to low temperature microspheres of the blowing temperature no more than 120 DEG C
Grain), being added to 10kg partial size is to be added in high-shear emulsion machine in 20 ~ 40 μm of polypropylene powder, adjust rotor speed to
2500r/min opens driving motor, mixes material uniformly, sticky system is made.Meanwhile it being acted in strong shear agitation
Under, it is involved in air in system, forms preliminary foams；Resulting preliminary foams are placed in mold, are passed through 130 DEG C
High temperature saturated vapor heats it, and control steam pressure is 0.3MPa, and internal expandable microspheres are heated, volume expansion,
Foaming agent, which decomposes, generates gas, forms abscess, polyacrylic rapid spatial expansion is full of mold, cooling after foam pop-up pending
Polypropylene foam is obtained after solidification.
To the polypropylene foam that embodiment 5 obtains, 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 method of by low temperature microspheres expanded polypropylene plastics, preparing the detailed process of expanded polypropylene such as
Under:
Using (2- ethyl hexyl) ester of 0.8kg phthalic acid two as plasticizer, using 1.2kg pine tar as liquid softening agent, with
2.5kg originate blowing temperature no more than 120 DEG C low temperature microspheres (using polymethyl methacrylate as shell, sodium bicarbonate
For the particle of core), it is added in the polypropylene powder that 10kg partial size is 20 ~ 40 μm, is added in high-shear emulsion machine, adjusts rotor
Revolving speed opens driving motor, mixes material uniformly, sticky system is made to 2400r/min.Meanwhile it being stirred in strong shearing
It mixes under effect, air is involved in system, form preliminary foams；Resulting preliminary foams are placed in mold, are passed through
140 DEG C of high temperature saturated vapor heats it, and control steam pressure is 0.26MPa, and internal expandable microspheres are heated, body
Product expansion, foaming agent, which decomposes, generates gas, forms abscess, and polyacrylic rapid spatial expansion is full of mold, foam pop-up pending
Afterwards, polypropylene foam is obtained after cooling and solidifying.
To the polypropylene foam that embodiment 6 obtains, 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 method of by low temperature microspheres expanded polypropylene plastics, preparing the detailed process of expanded polypropylene such as
Under:
Using 0.9kg dicyclohexyl phthalate as plasticizer, using 1.4kg coal tar as liquid softening agent, with 2.3kg rise
(using polymethyl methacrylate as shell, sodium bicarbonate is of core to low temperature microspheres of the beginning blowing temperature no more than 120 DEG C
Grain), being added to 10kg partial size is to be added in high-shear emulsion machine in 20 ~ 40 μm of polypropylene powder, adjust rotor speed to
2000r/min opens driving motor, mixes material uniformly, sticky system is made.Meanwhile it being acted in strong shear agitation
Under, it is involved in air in system, forms preliminary foams；Resulting preliminary foams are placed in mold, are passed through 130 DEG C
High temperature saturated vapor heats it, and control steam pressure is 0.3MPa, and internal expandable microspheres are heated, volume expansion,
Foaming agent, which decomposes, generates gas, forms abscess, polyacrylic rapid spatial expansion is full of mold, cooling after foam pop-up pending
Polypropylene foam is obtained after solidification.
To the polypropylene foam that embodiment 7 obtains, 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 (6)
1. a kind of method by low temperature microspheres expanded polypropylene plastics, which is characterized in that soft using plasticizer and liquid
Agent reduces polyacrylic softening point, mixes it with low temperature microspheres, through high speed shear and is involved in air, is formed preliminary
Foams；Then it is heated by saturated vapor so that microspheres volume expansion, generates foamed gas, so that polypropylene be made
Foam, specific step is as follows for preparation:
(1) plasticizer, liquid softening agent and low temperature microspheres are added in polypropylene powder in certain mass ratio, are added
Enter in high-shear emulsion machine, adjust rotor speed, opens driving motor, mix material uniformly, sticky system is made；Meanwhile
Under strong shear agitation effect, it is involved in air in system, forms preliminary foams；The additional amount of the plasticizer is
The 8 ~ 10% of polypropylene powder quality, the additional amount of the liquid softening agent are the 10 ~ 15% of polypropylene powder quality, the low temperature
The additional amount of microspheres is the 20 ~ 25% of polypropylene powder quality；
(2) the resulting preliminary foams of step (1) are placed in mold, are passed through high temperature saturated vapor and it is heated, controlled
In a certain range, internal expandable microspheres are heated, volume expansion for steam pressure, and foaming agent, which decomposes, generates gas, form bubble
Hole, polyacrylic rapid spatial expansion are full of mold and obtain polypropylene foam after cooling and solidifying after foam pop-up pending；It is described
The temperature of saturated vapor is 130 ~ 150 DEG C；The steam pressure is 0.25 ~ 0.3MPa.
2. a kind of 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 hexyl) ester, two ring of di-n-octyl phthalate or phthalic acid
Own ester.
3. a kind of method by low temperature microspheres expanded polypropylene plastics according to claim 1, it is characterised in that: step
Suddenly (1) described liquid softening agent is coal tar, pine tar, coal tar pitch or rosin.
4. a kind of method by low temperature microspheres expanded polypropylene plastics according to claim 1, it is characterised in that: step
Suddenly (1) described low temperature microspheres are the core-shell particle of polymer shell encapsulated blowing agent composition, starting foaming temperature
Degree is no more than 120 DEG C.
5. a kind of method by low temperature microspheres expanded polypropylene plastics according to claim 1, it is characterised in that: step
Suddenly the partial size of (1) described polypropylene powder is 20 ~ 40 μm.
6. a kind of method by low temperature microspheres expanded polypropylene plastics according to claim 1, it is characterised in that: step
Suddenly (1) described rotor speed is set as 2000 ~ 2500r/min.
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| 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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| CN103589070B (en) * | 2013-11-27 | 2016-01-20 | 天津市普立泰高分子科技有限公司 | Physical blowing 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. |
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