CN108340532A - A kind of product molding method of PP/PC micro-foaming materials - Google Patents
A kind of product molding method of PP/PC micro-foaming materials Download PDFInfo
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- CN108340532A CN108340532A CN201810132662.2A CN201810132662A CN108340532A CN 108340532 A CN108340532 A CN 108340532A CN 201810132662 A CN201810132662 A CN 201810132662A CN 108340532 A CN108340532 A CN 108340532A
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- foaming
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- molding method
- product molding
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- 239000000463 material Substances 0.000 title claims abstract description 60
- 238000005187 foaming Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000000465 moulding Methods 0.000 title claims abstract description 17
- 239000004743 Polypropylene Substances 0.000 claims abstract description 56
- 239000012994 photoredox catalyst Substances 0.000 claims abstract description 51
- 239000004417 polycarbonate Substances 0.000 claims abstract description 51
- 238000002347 injection Methods 0.000 claims abstract description 29
- 239000007924 injection Substances 0.000 claims abstract description 29
- 239000012141 concentrate Substances 0.000 claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 239000004088 foaming agent Substances 0.000 claims abstract description 16
- 150000001875 compounds Chemical class 0.000 claims abstract description 15
- 238000001125 extrusion Methods 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 239000002105 nanoparticle Substances 0.000 claims abstract description 8
- -1 blowing promotor Substances 0.000 claims abstract description 6
- 238000002844 melting Methods 0.000 claims abstract description 6
- 230000008018 melting Effects 0.000 claims abstract description 6
- 238000005453 pelletization Methods 0.000 claims abstract description 6
- 229920005989 resin Polymers 0.000 claims abstract description 6
- 239000011347 resin Substances 0.000 claims abstract description 6
- 239000002667 nucleating agent Substances 0.000 claims abstract description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical group [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 11
- 239000001993 wax Substances 0.000 claims description 11
- 239000002270 dispersing agent Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 6
- 239000004156 Azodicarbonamide Substances 0.000 claims description 5
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims description 5
- 235000019399 azodicarbonamide Nutrition 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 5
- 239000011787 zinc oxide Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 3
- 239000005543 nano-size silicon particle Substances 0.000 claims description 2
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 3
- 239000004067 bulking agent Substances 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 210000000497 foam cell Anatomy 0.000 abstract 1
- 229920001155 polypropylene Polymers 0.000 description 54
- 239000002994 raw material Substances 0.000 description 20
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000004898 kneading Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000006260 foam Substances 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000155 melt Substances 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 206010000269 abscess Diseases 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229920006125 amorphous polymer Polymers 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001887 crystalline plastic Polymers 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 239000000320 mechanical mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 102220040412 rs587778307 Human genes 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
Classifications
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
- B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- 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
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76551—Time
- B29C2945/76561—Time duration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of product molding methods of PP/PC micro-foaming materials, include the following steps：(1) foaming concentrate is made by double screw extruder after mixing foaming agent, blowing promotor, nucleating agent etc. and vector resin；(2) PP, PC, nano particle and bulking agent etc. are uniformly mixed, form PP/PC mixtures；(3) by the PP/PC mixtures of step (2) by the way that uniform compound is made after double screw extruder melting, extrusion, pelletizing；(4) foaming concentrate of step (1) is uniformly mixed to form mixed material after overactivation with the compound prepared by step (3)；(5) PP/PC microporous articles can be produced by mixed material being added in injection (mo(u)lding) machine.One aspect of the present invention can effectively improve the fretting map performance of PP/PC, and uniform foam cell density is high and size is small, on the other hand also avoid the influence to PP/PC composite materials properties brought because PP is incompatible with PC, of low cost, and processing is relatively convenient.
Description
Technical field
The present invention relates to the product molding methods of PP/PC micro-foaming materials, belong to the processing and manufacturing technology of polymer material
Field.
Background technology
In recent years, plastic injection product because produce it is adaptable, efficient, be easily operated automatically the features such as answered extensively
Have that light, raw material sources are abundant, the ratio of performance to price is superior with, wherein polypropylene (PP) resin and excellent heat resistance, resistance to
Chemical corrosivity, the features such as being easily recycled, be widely applied a kind of general thermoplastic resin in injected articles.With energy spy
It is not the in short supply of oil, how saves generation and development that plastic raw materials result in foaming product.It is formed and is foamed according to micropore
The difference of agent type, fretting map method can often be divided into chemical blowing, physical blowing and mechanical mixture foaming etc..It is noted using fretting map
Machine to be penetrated to produce microporous article, belongs to one kind of physical blowing, it mostly uses supercritical fluid (N2 or CO2) and is used as foaming agent,
Since fretting map injector has special gas injection and storage facility, thus, the technique is simpler, easy to control, green
Environmental protection, the stable quality etc. of product may be regarded as a kind of injection molding innovative technology.However, this method is limited to its needs
Dedicated unit improves corresponding cost of equipment and cost, this just gives corresponding production to make troubles.
It is also a kind of feasible side to generate gas using chemical foaming agent and process PP fretting map injected articles in turn
Method.Chinese invention patent 201110322117.8,201210069623.5,201210101328.3,201310090365.3 etc.
Disclose several preparation methods applied to PP foaming master batch, these methods be usually using chemical foaming agent by thermal decomposition to
It generates gas and forms a large amount of abscess inside product.These methods are convenient and simple for operation easy-to-use, need not increase corresponding
Equipment.However, polypropylene category Crystalline plastics, hardly flow below crystalline melt point, the gas core of formation is difficult to grow up, together
When, then melt viscosity drastically becomes smaller on crystalline melt point, and melt strength is very low, foamed gas easily escape again, therefore is intended to utilize
These methods obtain having the polypropylene expanded injected articles of uniform micro still very difficult.
PC is another common thermoplastic resin, and compare PP, it is amorphous polymer and melt strength is higher,
But it can be still uncertain at present by being added into the foam performance for improving PP by being blended in PP.This is primarily due to, PP
Architectural difference between PC is larger, therefore the two is difficult compatible, reports for work that show can be by being added compatilizer although existing
Method is come the compatibility that both improves, but the influence that the foaming effect after the two is blended in compatilizer is added is not known.Such as
What can handle PC well and two aspects such as the PP/PC mechanical properties variation for causing the variation of PP foam performances and compatibility to bring are added
The problem of it is still more important.Meanwhile current injection (mo(u)lding) machine basic structure is unfavorable for its production with preferable micropore knot
The product of structure, to the more demanding of process regulation, this also proposes challenge to the injection of the fretting map of PP/PC compounds for it.
Invention content
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provides a kind of PP/PC fretting maps product
Raw material prepares and injection moulding method, and can be obtained micropore with when corresponding process conditions by suitable material is evenly distributed
And the preferable foaming product of mechanical property.
Technical solution：In order to solve the above technical problems, a kind of product molding side of PP/PC micro-foaming materials of the present invention
Method includes the following steps：
(1) pass through after mixing foaming agent, blowing promotor, nucleating agent, dispersant and the vector resin after drying in proportion
Foaming concentrate is made in double screw extruder；
(2) it weighs and is uniformly mixed in proportion after drying PP, PC, nano particle, dispersant and PE-c-GMA, formed
PP/PC mixtures, the wherein mass ratio of PC are 10-25%, and the quality that PE-c-GMA accounts for PC is 20~30%, and dispersant is selected
High-melting-point PE waxes, content account for the 49~51% of PC mass；
(3) by the PP/PC mixtures of step (2) by being made uniform multiple after double screw extruder melting, extrusion, pelletizing
Close object；
(4) foaming concentrate of step (1) is mixed in proportion after overactivation with the compound prepared by step (3)
Mixed material and dried for standby are formed afterwards；
(5) PP/PC microporous articles can be produced under the process conditions of optimization by mixed material being added in injection (mo(u)lding) machine,
Wherein, melt temperature is set between 190~230 DEG C in injection (mo(u)lding) machine, the back of the body that mixed material is kept in plasticizing process
Pressure is 8-15MPA, and the dwell pressure in forming process controls between 5~15MPA.
Preferably, in the step (1) foaming agent be can heat safe azodicarbonamide, decomposition temperature exists
200 DEG C or so, quality accounting of the content in foaming concentrate is 10~30%.
Preferably, blowing promotor is zinc oxide (ZnO) in the step (1), content is azodicarbonamide quality
1~3%.
Preferably, dispersant selects high-melting-point PE waxes, quality accounting of the content in foaming concentrate in the step (1)
It is 9.9~10.1%.
Preferably, vector resin is the PP-g-MA of lazy flow in the step (1), maleic anhydride grafting ratio is
1%, melt fluid rate is in 1~10g/10min.
Preferably, nucleating agent is one or more of talcum powder or calcium carbonate in the step (1), content is being sent out
The quality accounting steeped in masterbatch is 10~30%, and grain size is at 2-10 microns.
Preferably, the nano particle in the step (2) is nano imvite, nano-titanium dioxide, nanometer titanium dioxide
One or more of silicon, it is (1~5) % that content, which accounts for the ratio between PP/PC mixture qualities, and grain size is within 100 nanometers.
Preferably, the foaming concentrate of the step (4) activates in vacuum drier in 80~100 degrees Celsius of environment
20~30 minutes.
Preferably, the ratio between foaming concentrate and mixed material gross mass in the finally formed mixed material of the step (4)
Between (2.0~8.0) %.
Preferably, injection pressure is set between 50~180MPA in step (5) injection (mo(u)lding) machine, injection time
It is set between 0.5~5 second, mold temperature is held between 40~80 degrees Celsius, and material is from into feeding cylinder to being injected into mold
The total time of cavity controlled between 1~20 minute.
It is closed preferably, the temperature of step (5) the injection (mo(u)lding) machine barrel front end is in during normal process
State, to ensure that the high temperature melt containing gas is not flowed out from the nozzle of barrel front end.
Two key techniques of the present invention are respectively the control of the proportion design and process conditions of material, and the two is mutually auxiliary
It coordinates.From PP it is expandable can from the point of view of, the addition of appropriate PC can promote the formation of gas core, but PC can cause PP/PC to be blended
The variation of object mechanical property, thus the compatibility that the two can be improved in bulking agent appropriate is added, but the two compatibility is very good, makes
The effect that PC promotes PP expandable is deteriorated, thus, material mixture ratio provided by the invention can take into account the balance of the two.Meanwhile
The appropriate of nano-particle is added expandable and product the mechanical property that can also synchronize and improve PP/PC, and nano-particle energy
No be dispersed in PP/PC melts is also required to carefully control.On the other hand, it from the point of view of process parameter control, is individually injecting
In the process, melt temperature, mold temperature, injection pressure, injection time, dwell pressure, dwell time, cooling time etc. are shadows
An important factor for ringing product property, these technological parameters equally seem important for foam injection molding.This is because hair
It is stored in barrel after being converted to gas after the heated fully decomposition of infusion, to ensure good compatibility between PP/PC melts,
To be related among these foaming agent decomposition, foaming agent and plastic melt be sufficiently mixed after form uniform gas to melt compound, gas molten
The gas escape factors such as less in compound.Heated time is short, temperature is low etc. can cause foaming agent to decompose insufficient, lower pressure
Gas can be caused to melt compound to be difficult to homogenize to be formed, and heated time is long, temperature is high or the effect of higher pressure to descend gas to melt compound
Gas is easy escape in object.In addition, the mass ratio of foaming agent needs to control in mixed material prepared by step of the present invention (4)
System, for appropriate content about between 0.7~0.8%, the content of foaming agent is excessive, it will because dividing in injector barrel
Solution is too many and material is caused to salivate delivery nozzle, increases control difficulty, while also will increase product abscess, quality of item mitigates too
It is more, it is unfavorable for the raising of mechanical property；The content of foaming agent is too small, then can be too small because of the tolerance of generation, and product only has part to obtain
With foaming to which abscess is uneven.
To sum up, the quality control of PP and PC and other materials in aforementioned range just using the two compatibility and institute
Generating the interaction of micropore, foam performance is excellent and the microporous article of good mechanical properties to obtain.
Advantageous effect：The product molding method of the PP/PC micro-foaming materials of the present invention, has the following advantages：
(1) it is compared with the PP fretting map products processed using physical blowing agent or other same type chemical foaming agent,
It is prepared using this method and the distribution of molding product micropore is apparent uniform, abscess-size is small, and cell density is big；
(2) use foaming agent as gas source, it is easy to get, of low cost, and storage and addition are easy to implement, general
Production can be thus achieved in logical injection (mo(u)lding) machine, the requirement to equipment is relatively low, thus has spy simple for process, easy to operate
Point；
(3) compatibility between a variety of materials has been taken into account during material preparation, to largely ensure and carry
The high mechanical property of PP/PC compounds；
(4) the process employs lower dwell pressure and shorter dwell time, cause clamp force and equipment energy consumption equal
It is substantially reduced, to reduce equipment operating cost, meanwhile, production efficiency greatly improved, particularly with thick-walled product；
(5) because of the presence of internal a large amount of micropores, extrudate density is caused to reduce, quality mitigates, and saves corresponding raw material；
(6) lower dwell pressure and micropore grow up two aspect collective effects realize material feeding, reduce conventional note
During penetrating because of caused by higher dwell pressure product internal stress, eliminate or reduce therefore and the product warpage brought becomes
Shape, the final dimensional accuracy for improving product；
(7) presence of uniform micro improves the performance of product sound insulation, heat-insulated, shockproof etc..
Description of the drawings
Fig. 1 is the raw material preparation and process flow chart of inventive article；
Fig. 2 is the microcellular structure scanning electron microscope result of inventive article；
Fig. 3 is the scanning electron microscope result of the raw material components microstructure of inventive article.
Specific implementation mode
The invention mainly comprises two parts key technology details such as raw material proportioning and processing and forming condition, this technological process is such as
Shown in Fig. 1.Equipment aspect needs a common kneading machine, vacuum drier, injector and double screw extruder, injector
Can be hydraulic drive, all-electric or electro-hydraulic joint, the temperature of injection (mo(u)lding) machine barrel front end is in during normal process
Closed state, the mold used are standard tensile batten mold, and mold temperature is controlled using the die heater of circulating hot oil heating
System.In terms of raw material, the PP trades mark used are domestic T30S, and melt flow rate (MFR) is 3.2g/10min (190 DEG C, 21.6N), PC
For the 141R of SABIC companies, melt flow rate (MFR) is 12.0g/10min (300 DEG C, 12.0N), in the PP-g-MA used
Maleic anhydride grafting ratio is 1%, and melt fluid rate is 2.2g/10min, and the content using GMA in PE-c-GMA is 8%,
From SIGMA-ALDRICH companies, melt fluid rate is 5.0g/10min, and the azodicarbonamide AC used comes from Suo Pu
Chemical plant, model Dn8 types, decomposition temperature scope be 193-205 degrees Celsius, the other auxiliary agents used be it is commercially available,
In, blowing promotor uses ZnO, and talcum powder and calcium carbonate grain size are between 2-10 microns, nano imvite, nanometer titanium dioxide
The grain size of titanium, nano silicon dioxide etc. is within 100 nanometers, and using high-melting-point PE waxes as dispersant, fusing point is about 100
℃。
Embodiment 1
First, foaming concentrate is manufactured.Raw material is weighed according to following quality：PP-g-MA：0.598kg, AC：0.2kg,
ZnO：0.002kg, high-melting-point PE waxes：0.1kg, talcum powder：0.1kg.After raw material is separately dried, it is uniformly mixed in kneading machine
And foaming concentrate is made by double screw extruder, melt temperature is 170 DEG C in extrusion；
Secondly, PP/PC mixtures are prepared.The raw material after drying is weighed according to following quality：PP：1kg, PC：0.1kg,
PE-c-GMA：0.03kg, nano imvite：0.02kg, high-melting-point PE waxes：0.05kg.These raw materials are mixed in kneading machine
PP/PC mixtures are formed uniformly, later, by the melting of common plastics extruder, squeeze out simultaneously pelletizing, the melt temperature in extrusion
Degree control is 205 DEG C；
Meanwhile the foaming concentrate of preparation being put into vacuum drier and is activated 20 minutes in 90 degrees Celsius of environment；
Later, foaming concentrate 0.04kg and PP/PC mixture 1kg are weighed, above two material is uniformly mixed, is formed multiple
Material is closed, the PP in mixed material is 10 with PC mass ratios：1, the AC content in material is about 0.77%；
Then, article of manufacture in normal injection molding machine is added in above-mentioned compound material, by melt temperature in injection process
Degree is set as 210 DEG C, and the back pressure that mixed material is kept in plasticizing process is 12MPA, the dwell pressure control in forming process
In 10MPA, injection pressure is set in 80MPA, and injection time is set in 1.5 seconds, and mold temperature is held in 60 DEG C, and material is from entrance
Barrel to be injected into mold cavity total time control about 5 minutes.
Finally, tensile property test is carried out to obtained PP/PC microporous articles, test result is shown in Table 1, article section
Stereoscan photograph it is as shown in Figures 2 and 3.
Embodiment 2
First, foaming concentrate is manufactured.Raw material is weighed according to following quality：PP-g-MA：0.497kg, AC：0.1kg,
ZnO：0.003kg, high-melting-point PE waxes：0.1kg, talcum powder：0.3kg.After raw material is separately dried, it is uniformly mixed in kneading machine
And foaming concentrate is made by double screw extruder, melt temperature is 150 DEG C in extrusion；
Secondly, PP/PC mixtures are prepared.The raw material after drying is weighed according to following quality：PP：1kg, PC：0.2kg,
PE-c-GMA：0.04kg, nano imvite：0.012kg, high-melting-point PE waxes：0.10kg.These raw materials are mixed in kneading machine
PP/PC mixtures are formed uniformly, later, by the melting of common plastics extruder, squeeze out simultaneously pelletizing, the melt temperature in extrusion
Degree control is 210 DEG C；
Meanwhile the foaming concentrate of preparation being put into vacuum drier and is activated 30 minutes in 100 degrees Celsius of environment；
Later, foaming concentrate 0.08kg and PP/PC mixture 1kg are weighed, above two material is uniformly mixed, is formed multiple
Material is closed, the PP in mixed material is 5 with PC mass ratios：1, the AC content in material is about 0.74%；
Then, article of manufacture in normal injection molding machine is added in above-mentioned compound material, by melt temperature in injection process
Degree is set as 190 DEG C, and the back pressure that mixed material is kept in plasticizing process is 8MPA, and the dwell pressure control in forming process exists
5MPA, injection pressure are set in 50MPA, and injection time is set in 5 seconds, and mold temperature is held in 80 DEG C, and material is from into feeding cylinder
It is controlled about 20 minutes to the total time for being injected into mold cavity.
Finally, tensile property test is carried out to obtained PP/PC microporous articles, test result is also found among table 1.
Embodiment 3
First, foaming concentrate is manufactured.Raw material is weighed according to following quality：PP-g-MA：0.494kg, AC：0.3kg,
ZnO：0.006kg, high-melting-point PE waxes：0.1kg, talcum powder：0.1kg.After raw material is separately dried, it is uniformly mixed in kneading machine
And foaming concentrate is made by double screw extruder, melt temperature is 160 DEG C in extrusion；
Secondly, PP/PC mixtures are prepared.The raw material after drying is weighed according to following quality：PP：1kg, PC：0.25kg,
PE-c-GMA：0.05kg, nano imvite：0.07kg, high-melting-point PE waxes：0.125kg.These raw materials are mixed in kneading machine
PP/PC mixtures are formed uniformly, later, by the melting of common plastics extruder, squeeze out simultaneously pelletizing, the melt temperature in extrusion
Degree control is 210 DEG C；
Meanwhile the foaming concentrate of preparation being put into vacuum drier and is activated 25 minutes in 100 degrees Celsius of environment；
Later, foaming concentrate 0.025kg and PP/PC mixture 1kg are weighed, above two material is uniformly mixed, is formed
Compound material, PP and PC mass ratios in mixed material are 4：1, the AC content in material is about 0.75%；
Then, article of manufacture in normal injection molding machine is added in above-mentioned compound material, by melt temperature in injection process
Degree is set as 230 DEG C, and the back pressure that mixed material is kept in plasticizing process is 12MPA, the dwell pressure control in forming process
In 15MPA, injection pressure is set in 180MPA, and injection time is set in 0.5 second, and mold temperature is held in 40 DEG C, material from into
Feeding cylinder to be injected into mold cavity total time control about 2 minutes.
Finally, tensile property test is carried out to obtained PP/PC microporous articles, test result is also found among table 1.
In order to which the effect to the present invention illustrates, comparative example is in addition listed, comparison result is also found in table 1, listed knot
Fruit is the test result carried out according to national standard in product loss of weight about 10%.Wherein, comparative example 1 is the fretting map of pure PP
Product, comparative example 2 are the foaming product with reference to embodiment 2 but when PC not being added, and comparative example 3 is not to be added with reference to embodiment 1 but
The foaming product of PE-c-GMA, comparative example 4 are the foaming product with reference to embodiment 1 but when nano particle not being added.
The tensile property of 1 different materials of table compares
The mechanical property that can be seen that the PP/PC microporous foam products of the present invention by the data of table 1 is preferable, meanwhile, by
The microcellular structure of the product that Fig. 2 is shown is it is found that the foam structure of the based article is uniform, thus this based article has that density is low, power
The features such as have excellent performance, to obviously have excellent application prospect, from the figure 3, it may be seen that the phase between the PP and PC of the present invention
Capacitive is after overregulating in more suitable range.
Claims (10)
1. a kind of product molding method of PP/PC micro-foaming materials, which is characterized in that include the following steps：
(1) by double spiral shells after foaming agent, blowing promotor, nucleating agent, dispersant and the vector resin after drying being mixed in proportion
Bar extrusion mechanism obtains foaming concentrate；
(2) it weighs and is uniformly mixed in proportion after drying PP, PC, nano particle, dispersant and PE-c-GMA, form PP/PC
The mass ratio that mixture, wherein PC account for PP is 10-25%, and the quality that PE-c-GMA accounts for PC is 20~30%, and dispersant is selected
High-melting-point PE waxes, content account for the 49~51% of PC mass；
(3) by the PP/PC mixtures of step (2) by being made uniform compound after double screw extruder melting, extrusion, pelletizing
Object；
(4) foaming concentrate of step (1) is mixed in proportion into rear shape after overactivation with the compound prepared by step (3)
Resulting mixture material and dried for standby；
(5) mixed material is added in injection (mo(u)lding) machine and produces PP/PC microporous articles, wherein melt temperature in injection (mo(u)lding) machine
Be set between 190~230 DEG C, the back pressure that mixed material is kept in plasticizing process is 8-15MPA, the guarantor in forming process
Pressure pressure controls between 5~15MPA.
2. the product molding method of PP/PC micro-foaming materials according to claim 1, it is characterised in that：The step (1)
Middle foaming agent be can heat safe azodicarbonamide, quality accounting of the content in foaming concentrate be 10~30% it
Between.
3. the product molding method of PP/PC micro-foaming materials according to claim 1, it is characterised in that：The step (1)
Middle blowing promotor is zinc oxide, and content is the 1~3% of azodicarbonamide quality.
4. the product molding method of PP/PC micro-foaming materials according to claim 1, it is characterised in that：The step (1)
Middle vector resin is the PP-g-MA of lazy flow, and maleic anhydride grafting ratio 1%, melt fluid rate is in 1~10g/
10min。
5. the product molding method of PP/PC micro-foaming materials according to claim 1, it is characterised in that：The step (1)
Middle nucleating agent be one or more of talcum powder or calcium carbonate, quality accounting of the content in foaming concentrate be 10~
30%, grain size is at 2-10 microns.
6. the product molding method of PP/PC micro-foaming materials according to claim 1, it is characterised in that：The step (1)
It is 9.9~10.1% in the quality accounting of foaming concentrate that middle dispersant, which selects high-melting-point PE waxes, content,.
7. the product molding method of PP/PC micro-foaming materials according to claim 1, it is characterised in that：The step (2)
In nano particle be nano imvite, nano-titanium dioxide, one or more of nano silicon dioxide, content accounts for PP/
The ratio between PC mixture qualities are (1~5) %, and grain size is within 100 nanometers.
8. the product molding method of PP/PC micro-foaming materials according to claim 1, it is characterised in that：The step (4)
Foaming concentrate activated 20~30 minutes in 80~100 degrees Celsius of environment in vacuum drier.
9. the product molding method of PP/PC micro-foaming materials according to claim 1, it is characterised in that：The step (4)
The ratio between foaming concentrate and mixed material gross mass are (2.0~8.0) % in finally formed mixed material.
10. the product molding method of PP/PC micro-foaming materials according to claim 1, it is characterised in that：The step
(5) injection pressure is set between 50~180MPA in injection (mo(u)lding) machine, and injection time was set between 0.5~5 second, mold temperature
Degree be held between 40~80 degrees Celsius, material from into feeding cylinder to be injected into mold cavity total time control at 1~20 point
Between clock.
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|---|---|---|---|---|
| CN104072881A (en) * | 2013-03-28 | 2014-10-01 | 滁州格美特科技有限公司 | Thermoplastic micro-foaming damping material and preparation method thereof |
| CN104086941B (en) * | 2014-07-11 | 2017-03-29 | 上海锦湖日丽塑料有限公司 | A kind of resin combination that can be used with Direct Electroplating |
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2018
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104072881A (en) * | 2013-03-28 | 2014-10-01 | 滁州格美特科技有限公司 | Thermoplastic micro-foaming damping material and preparation method thereof |
| CN104086941B (en) * | 2014-07-11 | 2017-03-29 | 上海锦湖日丽塑料有限公司 | A kind of resin combination that can be used with Direct Electroplating |
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