CN104859128A - Manufacturing method of plastic container with pearlescent effects - Google Patents
Manufacturing method of plastic container with pearlescent effects Download PDFInfo
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- CN104859128A CN104859128A CN201410066372.4A CN201410066372A CN104859128A CN 104859128 A CN104859128 A CN 104859128A CN 201410066372 A CN201410066372 A CN 201410066372A CN 104859128 A CN104859128 A CN 104859128A
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Abstract
The invention discloses a manufacturing method of a plastic container with pearlescent effects. The manufacturing method comprises raw material preparation and container manufacture. The raw material preparation process comprises grinding 1-10wt% of a polyolefin polymer to obtain powder with the average particle size of 500 micrometers or less and mixing the powder and 99-90wt% of poly(ethylene terephthalate) granules. The container manufacture process comprises well mixing the above raw materials and carrying out injection molding by an injection molding technology so that a bottle blank is obtained, and carrying out blow molding on the bottle blank to obtain the plastic container. The polyolefin polymer is selected from polyethylene, polypropylene, polymethylpentene, a polyolefin elastomer and an ethene-vinyl acetate copolymer. Through use of the polyolefin polymer powder in poly(ethylene terephthalate), the plastic container has pearlescent effects and the problems of poor plasticity and current mark flaws are solved.
Description
Technical field
The present invention relates to a kind of manufacture method, particularly relate to a kind of manufacture method being used for making the plastic bottle with pearl effect.
Background technology
PET is the transparent resin that a kind of toughness is good, quality is light, resistance to acids and bases is good, therefore is often made into plastic bottle miscellaneous.The product made to make PET has just like the outward appearance of pearl effect, EP0456929A2 discloses a kind of PET containing 99.1wt%-99.99wt%, and the constituent of the polymethylpentene of 0.01wt%-0.9wt%.
Experimental result according to the table 1 of this patent of invention Instructions Page 3 is known, this patent of invention once attempted using such as in application at that time: polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and the polyolefin polymers of polymethyl methacrylate etc. is as material, but find at experimentation, the use amount of polyolefin polymers was when close to 10wt% in the past, although preferably pearl effect can be produced, but the disappearance that processability is not good can be produced, and make product have the outward appearance of current mark flaw, if when the use amount of polyolefin polymers is reduced to 0.5wt%, although the problem that processability is not good can be improved, but the pearl effect of product is bad, if when the use amount of polyolefin polymers is increased to 3%, the processability of ethylene-vinyl acetate copolymer is only had still to remain better, but the pearl effect of product is unsatisfactory, remaining polyolefin polymers all cannot take into account pearl effect and processability.Based on above experimental result, the use amount of polyolefin polymers is not only limited in below 1wt% by the claims 1 of this European patent, also limits this polyolefin polymers and can only select polymethylpentene.That is, learnt by the experimental result of this European patent, no matter select which kind of polyolefin polymers, as long as use amount is higher than 1wt%, all cannot take into account the pearl effect of processability and plastic bottle.
Summary of the invention
The object of the present invention is to provide one can have pearl effect and processability concurrently, and expand material can the manufacture method with the plastic bottle of pearl effect of Application Range.
The manufacture method of the plastic bottle of tool pearl effect of the present invention, comprises:
Prepare raw material stage: by the polyolefin polymers of 1-10wt%, and the PET mixing that 90-99wt% is granular; And
Make container step: with ejection forming technique aforementioned base materials mixed melting and penetrate into a bottle embryo, then by this bottle of embryo blow molding plastic bottle;
In this preparation raw material stage, first this polyolefin polymers is ground, make the average grain diameter of this polyolefin polymers be less than the average grain diameter of this PET.
Manufacture method of the present invention, the average grain diameter of this polyolefin polymers is better is less than or equal to 500m.
Manufacture method of the present invention, this polyolefin polymers and this PET are with the heat source mixed melting of temperature between 250-300 DEG C.Wherein, this thermal source is with the Segmented heating being divided at least three sections.
Manufacture method of the present invention, when this bottle of embryo will before this plastic bottle of stretching blow moulding, the bottle temperature of bottle embryo is between 80-130 DEG C.
Manufacture method of the present invention, this polyolefin polymers is selected from: polyethylene, polypropylene, polymethylpentene, polyolefin elastomer, and ethene and vinyl acetate co-polymer.
Beneficial effect of the present invention is: in the fabrication process, the average grain diameter of described TPO is allowed to be less than the average grain diameter of PET, the degree be separated can be reduced, promote capacity of heat transmission simultaneously, the temperature difference between each position is reduced, and then improves the processability of plastic bottle and the current mark flaw of tool pearl effect.
Accompanying drawing explanation
Fig. 1 is a schematic flow sheet of manufacture method of the present invention, and the manufacture process of a bottle embryo of the embodiment 1 of this manufacturing process is described;
Fig. 2 is another schematic flow sheet of this embodiment 1, illustrates that this bottle of embryo is blow molded into the process of a plastic bottle;
Fig. 3 is this finished product photo obtained by embodiment 1;
Fig. 4 is a finished product photo, and the flaw finished product obtained by comparative example 1 is described;
Fig. 5 is a finished product photo, and the flaw finished product obtained by comparative example 2 is described;
Fig. 6 is a finished product photo, and the flaw finished product obtained by comparative example 3 is described;
Fig. 7 is a finished product photo, and the flaw finished product obtained by comparative example 4 is described;
Fig. 8 is a finished product photo, and the flaw finished product obtained by comparative example 5 is described.
Detailed description of the invention
The manufacture method of the plastic bottle of tool pearl effect of the present invention, comprises:
Prepare raw material stage: by the polyolefin polymers of 1-10wt%, and the PET mixing that 90-99wt% is granular; And
Make container step: with ejection forming technique aforementioned base materials mixed melting and penetrate into a bottle embryo, then by this bottle of embryo blow molding plastic bottle;
In this preparation raw material stage, first this polyolefin polymers is ground, make the average grain diameter of this polyolefin polymers be less than the average grain diameter of this PET.The PET (Polyethylene Terephthalate, referred to as PET) used, is a kind of recyclable recycling and is widely used in the polyester material of various packing container.Because the aspect used is extensive, so often utilize this material for main component, then adds other additives, make plastic cement finished product miscellaneous.
This TPO (polyolefin) polymer refers to the polymer of the main chain of polymer by the addition polymerization of double bond alkene class key point.Concrete example is as polyethylene (Polyethylene, be called for short PE), polypropylene (Polypropylene, be called for short PP), polymethylpentene (Polymethylpentene, be called for short PMP), polyolefin elastomer (Polyolefin Elastomer, be called for short POE), ethene and vinyl acetate co-polymer (being called for short EVA) etc., wherein, polyethylene is except typical structure, also comprise such as: low density polyethylene (LDPE) (Low-densityPolyethylene, be called for short LDPE), high density polyethylene (HDPE) (High-densityPolyethylene, be called for short HDPE), LLDPE (Linear Low-densityPolyethylene, be called for short LLDPE) etc. the derivative of different structure.
The present invention comprises in fact in the step making container: shaped bottle embryo step and be blow molded into plastic bottle step, in shaped bottle embryo step, the temperature of the thermal source of heating this polyolefin polymers of mixed melting and this PET is to control between 250-300 DEG C as good, this heating-up temperature, except melting fusing point greatly about the PET of 250 DEG C, can also melt fusing point lower than the polyolefin polymers of 200 DEG C.Due in the process of mixing and ejection formation, along with the process of time has heat loss, therefore can processing temperature during injection be controlled higher than 250 DEG C, but lower than 300 DEG C.In addition, this thermal source is with the segmented method heating being divided at least three sections.Preferably, consider heat loss and avoid too much extra heat energy to expend, the heating-up temperature of this thermal source is divided at least three sections to be heated to 275 DEG C.More preferably, this thermal source heats to divide the mode of five sections, and the temperature setting in this thermal source each stage is respectively 250 DEG C, 265 DEG C, 275 DEG C, 275 DEG C, 275 DEG C.
Bottle embryo made by the present invention can be the form of test tube shape, and manufacture with Jet forming machine, when this bottle of embryo before this plastic bottle of blow molding, when the bottle temperature of bottle embryo is cooled to 80-130 DEG C, can directly carry out the processing procedure being blow molded into plastic bottle after ejection formation.This bottle of embryo also can ejection formation for subsequent use after cool to room temperature, when by the time will carry out being blow molded into plastic bottle step, then this bottle of embryo is warmed up to 80-130 DEG C, then puts into a blow mold shaping.Because to process macromolecular material, its processing temperature must more than the glass transition temperature of macromolecular material, otherwise macromolecular material cannot process having character firmly crisp as glass.Concerning the PET of this main component, its glass transition temperature is greatly about 80 DEG C.Similarly, also have the problem of heat loss when blow molding, therefore heating-up temperature can set come high than the glass transition temperature of PET usually, such as 130 DEG C.Preferably, consider heat loss and avoid too much additional thermal energy to expend, and the time cooled thereafter and energy cost, the temperature of this bottle of embryo is adjusted to 100 DEG C.
Creator of the present invention finds after experiment, there is the plastic bottle of pearl effect in the past during fabrication, if when the addition of polyolefin polymers is higher than 1.0wt%, the plasticity of PET is not good, and the outward appearance of finished product easily produces current mark.And cause the reason of current mark flaw may come from the problem of the dispersion inequality that Material property differences causes.With PET, the structure of its body is for containing benzene ring structure and oxygen containing condensation polymer, nature is the addition of alkene double bond key point with primary structure in nature, and different based on the polyolefin polymers of carbon atom and hydrogen atom, the problem between different material on interface certainly will be had.With regard to the viewpoint of thermodynamics (Thermodynamics), mixing between different material, often in order to make surface energy (Surface Energy) decline, material of the same race is assembled and is gathered together, and material and contact area that he plants material are minimized.This behavior easily causes be separated (the phase separation) of material, makes finished product produce the outward appearance with current mark flaw.
When the percentage by weight of added TPO is little time, factor leading on thermodynamics is entropy (Entropy), that is, although TPO is dispersed in the middle of PET can cause relatively high surface energy, but because there is larger entropy compensation, situation about being separated still can not be produced.But along with the increase of percentage by weight of the TPO added, leading factor will transfer surface energy to by entropy, therefore the easy self assemble of identical raw material and producing is separated.The different regions that is separated, naturally different with the ability of reflection for the refraction of light, and then produce the current mark flaw that can be observed.Meanwhile, the existence be separated, is also reflected in the change of the capacity of heat transmission of material.Be separated produced many zoness of different, has many borders (boundary), and these zone boundaries can make the capacity of heat transmission of material decline, and the problem of the problem simultaneous current mark flaw making plasticity not good occurs.
Therefore the present invention is before raw material mixing, polyolefin polymers is worn into the powder that average grain diameter is less than or equal to 500 μm in advance, preferably, this polyolefin polymers grinds to form the powder that average grain diameter is less than or equal to 100 μm, again with PET Hybrid Heating, contribute to the dispersion of polyolefin polymers between main component PET added, and reduce the degree of microphase-separated.
Although polyolefin polymers grind into powder is mixed with PET, situation about being separated can be reduced occur, but when working as added poly percentage by weight more than 10wt%, because polyolefin polymers occupies sizable ratio, even if therefore TPO grind into powder is mixed with PET again, still effectively cannot improve the situation of current mark flaw.Therefore, manufacture method of the present invention, is useful in the situation of the percentage by weight shared by TPO at below 10wt% of interpolation.
[embodiment 1]
Consult Fig. 1, Fig. 2, Fig. 3 and table 1, embodiment 1 adopts the PET of 95wt% and the polymethylpentene of 5wt% to be raw material, and wherein, the density of PET is 1.40g/cm
3, PDI (Polydispersity Index) is 1.48, and its IV value is 0.85 ± 0.02.The density of polymethylpentene is 0.84g/cm
3, melt index is 22, and softening temperature is 170 DEG C.
Wherein, this polymethylpentene first grinds to form average grain diameter at the powder of 500 μm, then mixes with this PET.This raw material is put into a Jet forming machine 1, and be divided into 250 DEG C, 265 DEG C, 275 DEG C, 275 DEG C, 275 DEG C five sections to be heated to 275, then by this raw material injection molding bottle embryo 2.Again this bottle of embryo 2 is seated in a temperature regulator 3, by this bottle of embryo temperature adjusting to 100 DEG C afterwards.Finally this bottle of embryo 2 embryo is inserted in the middle of a mold 4, pour into air and blow molding is a plastic bottle 5.In the process of blow molding, measure this bottle of embryo each section of temperature, wherein, be 98 DEG C in the mean temperature of bottle embryo epimere, and the mean temperature in bottle embryo stage casing is 97 DEG C, and the mean temperature of bottle embryo hypomere is 103 DEG C, and the maximum mean temperature difference of bottle embryo entirety is 6 DEG C.
[embodiment 2]
Consult table 1, embodiment 2 is similar with this embodiment 1, and different places is that embodiment 2 adopts the PET of 90wt% and the polyethylene of 10wt% to be raw material, and wherein, this poly density is 0.920g/cm
3, MI value is 0.7, and softening temperature is 90 DEG C, and is ground into average grain diameter at the powder of 500 μm.In the process of blow molding, measure bottle embryo each section of temperature, wherein, be 94 DEG C in the mean temperature of bottle embryo epimere, and the mean temperature in bottle embryo stage casing is 93 DEG C, and the mean temperature of bottle embryo hypomere is 101 DEG C, and the maximum mean temperature difference of bottle embryo entirety is 8 DEG C.
[embodiment 3]
Consult table 1, embodiment 3 is similar with this embodiment 2, and different places is that embodiment 3 adopts the PET of 99wt% and the polyethylene of 1wt% to be raw material.In the process of blow molding, measure bottle embryo each section of temperature, wherein, be 100 DEG C in the mean temperature of bottle embryo epimere, and the mean temperature in bottle embryo stage casing is 99 DEG C, and the mean temperature of bottle embryo hypomere is 103 DEG C, and the maximum mean temperature difference of bottle embryo entirety is 4 DEG C.
[embodiment 4]
Consult table 1, embodiment 4 is similar with this embodiment 1, and different places is that embodiment 4 adopts the PET of 90wt% and the polypropylene of 10wt% to be raw material, and wherein, this polyacrylic density is 0.899g/cm
3, MFR value is 18, Haze value is 25-30%, and grinds to form average grain diameter at the powder of 500 μm.In the process of blow molding, measure bottle embryo each section of temperature, wherein, be 100 DEG C in the mean temperature of bottle embryo epimere, and the mean temperature in bottle embryo stage casing is 101, and the mean temperature of bottle embryo hypomere is 108, and the maximum mean temperature difference of bottle embryo entirety is 8 DEG C.
[embodiment 5]
Consult table 1, embodiment 5 is similar with this embodiment 4, and different places is: the present embodiment adopts the PET of 99wt% and the polypropylene of 1wt% to be raw material.In the process of blow molding, measure bottle embryo each section of temperature, wherein, be 108 in the mean temperature of bottle embryo epimere, and the mean temperature in bottle embryo stage casing is 107 DEG C, and the mean temperature of bottle embryo hypomere is 111 DEG C, and the maximum mean temperature difference of bottle embryo entirety is 4 DEG C.
[embodiment 6]
Consult table 1, embodiment 6 is similar with this embodiment 3, and to be this polyethylene be in different places grinds to form average grain diameter at the powder of 100 μm.In the process of blow molding, measure bottle embryo each section of temperature, wherein, be 101 in the mean temperature of bottle embryo epimere, and the mean temperature in bottle embryo stage casing is 101 DEG C, and the mean temperature of bottle embryo hypomere is 104 DEG C, and the maximum mean temperature difference of bottle embryo entirety is 3 DEG C.
[embodiment 7]
Consult table 1, embodiment 7 is similar with this embodiment 5, and to be this polypropylene be in different places grinds to form average grain diameter at the powder of 100 μm.In the process of blow molding, measure bottle embryo each section of temperature, wherein, be 109 DEG C in the mean temperature of bottle embryo epimere, and the mean temperature in bottle embryo stage casing is 110 DEG C, and the mean temperature of bottle embryo hypomere is 111 DEG C, and the maximum mean temperature difference of bottle embryo entirety is 2 DEG C.
[comparative example 1]
Consult table 1 and Fig. 4, comparative example 1 is similar with this embodiment 1, and different places is the non-grind into powder of this polymethylpentene, and its average grain diameter is 4mm.By the finished product obtained by this comparative example 1, be faulty materials with current mark flaw outward appearance.Can be found by this table 1, this comparative example 1 is in the process of blow molding, and the maximum mean temperature difference of bottle embryo entirety is 10 DEG C.[comparative example 2]
Consult table 1 and Fig. 5, comparative example 2 is similar with this embodiment 2, and different places is the non-grind into powder of this polyethylene, and its average grain diameter is 5mm.By the finished product obtained by this comparative example 2, be faulty materials with current mark flaw outward appearance.Can be found by this table 1, this comparative example 2 is in the process of blow molding, and the maximum mean temperature difference of bottle embryo entirety is 12 DEG C.
[comparative example 3]
Consult table 1 and Fig. 6, comparative example 3 is similar with this embodiment 2, and different places is to adopt the PET of 88wt% and the polyethylene of 12wt% to be raw material.By the finished product obtained by this comparative example 3, be also faulty materials with current mark flaw outward appearance.Can be found by this table 1, this comparative example 3 is in the process of blow molding, and the maximum mean temperature difference of bottle embryo entirety is 11 DEG C.
[comparative example 4]
Consult table 1 and Fig. 7, comparative example 4 is similar with this embodiment 4, and different places is the non-grind into powder of this polypropylene, and its average grain diameter is 4mm.By the finished product obtained by this comparative example 4, be also faulty materials with current mark flaw outward appearance.Can be found by this table 1, this comparative example 4 is in the process of blow molding, and the maximum mean temperature difference of bottle embryo entirety is 12 DEG C.
[comparative example 5]
Consult table 1 and Fig. 8, comparative example 5 is similar with this embodiment 4, and the present embodiment adopts the PET of 88wt% and the polypropylene of 12wt% to be raw material.By the finished product obtained by this comparative example 5, be also faulty materials with current mark flaw outward appearance.Can be found by this table 1, this comparative example 5 is in the process of blow molding, and the maximum mean temperature difference of bottle embryo entirety is 12 DEG C.
Consult table 1, compare this embodiment 1 and this comparative example 1, this embodiment 2 and this comparative example 2 respectively, and this embodiment 4 can find with this comparative example 4, the polyolefin polymers will be added in advance, namely polymethylpentene, polyethylene, and polypropylene grinds to form average grain diameter at the powder of 500 μm, all contributes to improving heat conduction property, make the maximum mean temperature difference of embodiments of the invention in blow-molding process, come little compared to corresponding comparative example.
In addition, compare this embodiment 2 and this comparative example 3 respectively, this embodiment 4 can find with this comparative example 5, and in polyolefin polymers, namely polyethylene and polyacrylic addition are when 10wt%, and the maximum mean temperature difference of bottle embryo in blow-molding process is all at 8 DEG C.But when polyethylene and polyacrylic addition are respectively at 12wt%, even if in advance polyethylene and polypropylene are ground to form average grain diameter at the powder of 500 μm, the maximum mean temperature difference of bottle embryo in blow-molding process is also all more than 11 DEG C.
Finally, relatively this embodiment 3 and this embodiment 6, and compare this embodiment 5 and can find with this embodiment 7, polyethylene and polypropylene are ground to form in advance average grain diameter at the powder of 100 μm, the maximum mean temperature difference of this bottle of embryo in blow-molding process can be made more to reduce.
In sum, manufacture method of the present invention passes through mixed weight percentage at 90%-99% PET, and percentage by weight is at the raw material of the polyolefin polymers of 1-10%, and polyolefin polymers is ground to form before mixed the powder that average grain diameter is less than 500 μm, capacity of heat transmission can be made to be unlikely to be deteriorated, and the temperature difference between different end points is diminished, and there is the situation that plasticity improves current mark generation simultaneously, therefore really can reach the object of the present invention.
Claims (6)
1. a manufacture method for the plastic bottle of tool pearl effect, comprises:
Prepare raw material stage: by the polyolefin polymers of 1-10wt%, and the PET mixing that 90-99wt% is granular; And
Make container step: with ejection forming technique aforementioned base materials mixed melting and penetrate into a bottle embryo, then by this bottle of embryo blow molding plastic bottle;
It is characterized in that: in this preparation raw material stage, first this polyolefin polymers is ground, make the average grain diameter of this polyolefin polymers be less than the average grain diameter of this PET.
2. the manufacture method of the plastic bottle of tool pearl effect as claimed in claim 1, is characterized in that: the average grain diameter of this polyolefin polymers is less than or equal to 500 μm.
3. the manufacture method of the plastic bottle of tool pearl effect as claimed in claim 1, is characterized in that: this polyolefin polymers is selected from: polyethylene, polypropylene, polymethylpentene, polyolefin elastomer, and ethene and vinyl acetate co-polymer.
4. the manufacture method of the plastic bottle of tool pearl effect as claimed any one in claims 1 to 3, is characterized in that: this polyolefin polymers and this PET are with the heat source mixed melting of temperature between 250-300 DEG C.
5. the manufacture method of the plastic bottle of tool pearl effect as claimed in claim 4, is characterized in that: this thermal source is with the Segmented heating being divided at least three sections.
6. the manufacture method of the plastic bottle of tool pearl effect as claimed in claim 5, is characterized in that: when this bottle of embryo will before this plastic bottle of blow molding, the bottle temperature of this bottle of embryo is between 80-130 DEG C.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109401210A (en) * | 2017-08-16 | 2019-03-01 | 威玛精密化学科技股份有限公司 | Pearly-lustre constituent |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101432120A (en) * | 2006-05-04 | 2009-05-13 | 乐思乐可斯公司 | Preform and container for radiation-sensitive products and method for the production thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101432120A (en) * | 2006-05-04 | 2009-05-13 | 乐思乐可斯公司 | Preform and container for radiation-sensitive products and method for the production thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109401210A (en) * | 2017-08-16 | 2019-03-01 | 威玛精密化学科技股份有限公司 | Pearly-lustre constituent |
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