CN102251318A - Method for improving whiteness of recovered polyethylene terephthalate fiber and application thereof - Google Patents
Method for improving whiteness of recovered polyethylene terephthalate fiber and application thereof Download PDFInfo
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- CN102251318A CN102251318A CN 201010173539 CN201010173539A CN102251318A CN 102251318 A CN102251318 A CN 102251318A CN 201010173539 CN201010173539 CN 201010173539 CN 201010173539 A CN201010173539 A CN 201010173539A CN 102251318 A CN102251318 A CN 102251318A
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Abstract
The invention relates to a method for improving whiteness of recovered polyethylene terephthalate fiber, which gives consideration to environmental protection and various cost, and can also effectively improve properties of the fiber; the method comprises the following steps: performing spinning of recovered polyethylene terephthalate with a whiteness hue value of between 55 and 80, and a composition comprising polyethylene terephthalate with a whiteness hue value of between 85 and 95 by a composite fiber spinning machine so as to prepare core-sheath polyethylene terephthalate fiber; the core layer is composed of the recovered polyethylene terephthalate; the sheath layer is composed of the composition; the cross section of the fiber is as concentric circles, wherein the relation between a radius R1 of an inner circle and a radius R2 of an outer circle of the concentric circles is shown as follows: 1.11<=R2/R1<=4.48 (I).
Description
Technical field
The present invention relates to a kind of lifting polyethylene terephthalate (polyethyleneterephthalate; Abbreviate PET as) method of fibre whiteness, particularly relate to a kind of method that promotes the dacron fibre whiteness of recovery, and a kind of core-sheath-type dacron fibre that makes with this method.
Background technology
Along with environmental consciousness strengthens, industry is also paid attention to the recycling of material gradually, the particularly recovery of plastics, and polyethylene terephthalate is exactly one of at present common plastic material for packaging, often be made into various Packaging Bottle and be used to take up various types of beverages, mineral water or milk, or even machine oil etc., therefore, in recent years, environmental protection unit actively promotes the recycling of polyethylene terephthalate discarded object, for example it is made fiber again.
General this type of processing method of recycling the waste is earlier the polyethylene terephthalate discarded object that reclaims to be given classification, carry out steps such as fragmentation and cleaning again, but, still having undesired residue in the final reclaimed materials inevitably exists, if so will prepare fiber with the polyethylene terephthalate that reclaims the time, following problem most likely takes place: the whiteness of the fiber that (1) makes is not good, because the common color and luster of polyethylene terephthalate that reclaims is yellow partially; And the dyeing mass-tone rate of (2) fiber of making is not good, because other impurity is still arranged in the polyethylene terephthalate reclaimed materials, and composition and the content of the impurity in different batches the reclaimed materials also is not quite similar, and that is to say unmanageable difference existence.
At the problems referred to above, the present corresponding way of industry mainly be with manual type with the classification of polyethylene terephthalate reclaimed materials after, filter out available reclaimed materials (whiteness is the person in tolerance interval) and be made into a large amount of fibrous finished products.Afterwards, carry out scalping again according to the quality of the fibrous finished product that makes, and then filter out fibrous finished product with the acceptable quality of downstream client.But this method mainly is by manually screening, so need expend a large amount of manpowers and time cost, also expend simultaneously preparation and QC cost, and usually with the prepared fibrous finished product of a collection of reclaimed materials, whiteness of different piece such as section is also variant greatly with the mass-tone rate that dyes before, during and after it.
In addition,, cause its productive rate on the low side, further increased and produce cost owing to need to reject not good reclaimed materials and the fibrous finished product of many form and aspect in the artificial screening process.For solving aforesaid problem, begin to have manufacturer to attempt in the lower polyethylene terephthalate reclaimed materials of whiteness hue value, adding pure polyethylene terephthalate and (just directly carry out condensation polymerization reaction gained via a phthalic acid and monoethylene glycol, and without used polyethylene terephthalate), but, this way is limited for the lifting effect of fibre whiteness, and dyeing mass-tone rate is not good still can't obtain effective improvement with problem fiber product quality inequality, generally speaking, this kind mode to improve effect still limited.
Therefore, still have that need to develop a kind of tool feature of environmental protection, preparation and QC cost low, and can promote the dacron fibre whiteness that reclaims, and improve the method that reclaimed materials produces rate.
Summary of the invention
First purpose of the present invention is to provide a kind of can take into account environmental protection and every cost, and can effectively improve the method for the dacron fibre whiteness that the lifting of fibre property reclaims again.
So, the present invention promotes the method for the dacron fibre whiteness of recovery, it is characterized in that: this method is to be the polyethylene terephthalate of the recovery between 55 to 80 with a whiteness hue value, and one comprises that a whiteness hue value is the constituent of the polyethylene terephthalate between 85 to 95, carry out spinning with the composite fiber spinning machine, and then make a core-sheath-type dacron fibre, this sandwich layer is that the polyethylene terephthalate by this recovery is constituted, this sheath layer is made of this constituent, and the cross section of this fiber is to present a concentric circles, and this concentrically ringed interior radius of a circle R
1Radius R with cylindrical
2Relation as shown in the formula shown in (I):
1.11≤R
2/R
1≤4.48 (I)。
Second purpose of the present invention is to provide a kind of can take into account environmental protection and every cost, and the dacron fibre of whiteness through promoting.
Core-sheath-type dacron fibre of the present invention is prepared by the method for the dacron fibre whiteness of aforesaid lifting recovery.
Beneficial effect of the present invention is: the inventive method is by using one to comprise that a whiteness hue value is the constituent of the polyethylene terephthalate between 85 to 95, prepare a core-sheath-type dacron fibre with the existing polyethylene terephthalate that reclaims, and control wherein the sandwich layer radius and the ratio of sheath layer thickness in the defined scope of the present invention, just can be in taking into account under the feature of environmental protection and the every condition of cost, promote the whiteness of the dacron fibre that reclaims effectively, and improve the rate that produces of reclaimed materials.
Description of drawings
Fig. 1 is a horizontal section schematic diagram, in order to show the cross section of core-sheath-type dacron fibre of the present invention.
The specific embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
Because the whiteness of the existing dacron fibre that reclaims can't be enhanced effectively always, the inventor is after studying in many ways, develop a kind of method that can promote the dacron fibre whiteness of recovery effectively, it is to coat the dacron fibre that reclaims with pure dacron fibre, forming a core-sheath-type fiber, and the proportionate relationship of ectonexine radius of controlling this core sheath layer fiber simultaneously thickness of sheath layer (but not merely control) in the defined scope of the present invention.Disclosed method can reach the effect that promotes the whiteness of the dacron fibre that reclaims effectively under the situation of the quality of taking into account cost and fibrous finished product.
Pointed a kind of method that promotes the dacron fibre whiteness of recovery according to the present invention, it is to be the polyethylene terephthalate of the recovery between 55 to 80 with a whiteness hue value, and one comprises that a whiteness hue value is the constituent of the polyethylene terephthalate between 85 to 95, carry out spinning with existing composite fiber spinning machine, and then make a core-sheath-type dacron fibre.
As shown in Figure 1, this core-sheath-type dacron fibre comprises a sandwich layer 1 and a sheath layer 2, this sandwich layer 1 is that the polyethylene terephthalate by this recovery is constituted, this sheath layer 2 is made of this constituent, and the cross section of this fiber is to present a concentric circles, and the periphery of this sandwich layer 1 is exactly the circumference of this concentrically ringed interior circle; The periphery of this sheath layer 2 is exactly the circumference of this concentrically ringed cylindrical.
Above-mentioned interior radius of a circle R
1Radius R with cylindrical
2Have as shown in the formula the relational expression shown in (I):
1.11≤R
2/R
1≤4.48 (I)。
Work as R
2/ R
1＜1.11 o'clock, because it is very few to be provided as the pure PET amount of sheath layer, make the thickness of pure PET fiber of sheath layer be not enough to cover the color of the recovery PET fiber of sandwich layer, so that the color (being mainly inclined to one side yellow) of the recovery PET fiber of sandwich layer can see through the pure PET fiber of sheath layer and appear, the form and aspect that cause the fabric integer outward appearance that makes to be presented are not good, and (the L value is on the low side, L
bBe worth higher); And work as R
2/ R
1＞4.48 o'clock, whiteness hue value, the L of the PET fiber that makes
bThough value and dyeing mass-tone rate all can be obtained the effect of improvement, but because the PET content of employed recovery this moment is low excessively, will make so-called " environmental protection demand " to lose meaning.So-called for more emphasizing " environmental protection demand " is more preferred from R
2/ R
1≤ 3.71; The best is R
2/ R
1≤ 2.00.
Above-mentioned whiteness hue value (L value) is represented the lightness (Lightness) of this fiber, and its value is higher, and the whiteness of display fibers better; L
aValue is represented the redness and green colorfulness of this fiber, and red partially on the occasion of the color of expression fiber, negative value represents that the color of fiber is green partially; L
bValue is represented the yellow and blue colorfulness of this fiber, and is yellow partially on the occasion of the color of expression fiber, and negative value represents that the color of fiber is blue partially.In addition, because existing through the PET reclaimed materials of recycling and the L of pure PET
aValue all is between-3.0 to 0, all meets industry and uses standard, so this case is not given unnecessary details this partly.
The inventor finds through research back in many ways, if when coating recovery PET fiber with pure PET fiber as the sheath layer, only controls the sheath layer thickness and is not sufficient to reach fully the purpose that the present invention improves the fiber form and aspect.Because under identical sheath layer thickness, along with the increase of sandwich layer radius, will be for the effect of improving of fiber outward appearance form and aspect along with reduction.
As previously mentioned, according to the prepared recovery dacron fibre of method of the present invention, add man-hour carrying out stock-dye, dyestuff mainly is that the PET fiber to the sheath layer dyes, because the skin that the present invention reclaims dacron fibre is coated with one by sheath layer that pure PET constituted, so can obtain and the close Color of pure PET fiber, have close dyeing mass-tone rate.Just can avoid prior art to reclaim the uneven situation of dyeing that PET caused whereby effectively, because reclaim impurity or other composition that PET contains usually can influence Color because of containing in the fibrous outer.
Be familiar with the skill person in field of the present invention, enlightenment via the technology that specification of the present invention disclosed, when recognizing easily, when fiber production, can regulate and control in several ways in the core sheath layer fiber, the thickness of the radius of sandwich layer and sheath layer, so it is in the present invention for the method for the thickness of control radius of sandwich layer and sheath layer, and without particular limitation.Any existing or unknown technology so long as can make the fiber for preparing have defined specific core sheath layer fiber cylindrical and interior radius of circle ratio among the present invention, just can be used among the present invention, and reach purpose of the present invention.At this example that can enumerate, be limited to this but have more than, when for example using core-sheath-type fibre spinning machine to carry out spinning, when polyester ester grain passes through extruder (Extruder), and when carrying out high-temperature fusion, with the inlet amount (throughput) of measuring pump (metering pump) control sandwich layer and sheath layer, just can obtain any sandwich layer radius of wanting and sheath layer thickness simultaneously.
Though the inventive method can be improved the outward appearance form and aspect of the dacron fibre of recovery effectively, when but if the form and aspect of reclaimed materials are too poor, that is to say that the whiteness hue value is lower than 55, even improve through the inventive method, finally still might can't obtain gratifying FINAL APPEARANCE form and aspect.
For guaranteeing that the fiber outward appearance form and aspect after improving can obtain acceptable quality, preferably, the polyethylene terephthalate of this recovery has a whiteness hue value between 60 to 80.In addition, preferably, the L of the polyethylene terephthalate of this recovery
bValue is between 10 to 4.
Note, the whiteness hue value of the general PET bottle discarded object that reclaims is between 55 to 80, L
bValue is between 10 to 4.And the whiteness hue value of general commercially available pure polyethylene terephthalate is between 85 to 95.
The whiteness hue value of the general desired recovery dacron fibre product that obtains of industry is for being not less than 85, and the whiteness hue value of the recovery dacron fibre product of the better quality of industry energy output is usually between 85 to 89 at present; And its L
bValue then is not to be higher than 4, then is that expectation can have more than 91% as for dyeing mass-tone rate.And obtain through experimental study gained repeatedly by the inventor, work as R
2With R
1Between proportionate relationship in the defined scope of the present invention the time, according to whiteness hue value, the L of the prepared recovery dacron fibre of the inventive method
bValue reaches character such as dyeing mass-tone rate, not only can meet the standard that present industry high-quality reclaims the PET fiber, even also can reach higher standard.
In addition, because the PET reclaimed materials that can be applied among the present invention is without particular limitation basically,, more need not after making fiber, further manually to sort again classification work so the inventive method can significantly reduce the manpower with the artificial screening reclaimed materials.In addition, also owing to need not to screen especially the quality of reclaimed materials, even character is poor slightly, for example the unserviceable whiteness hue value of prior art is the reclaimed materials between 75 to 55, the inventive method all can be applied in the inventive method, so still can further improve the ratio that utilizes of reclaimed materials.Whereby, the inventive method can significantly reduce cost of labor and cost of material compared to prior art.
In addition, because according to the prepared recovery dacron fibre of the inventive method, outer parcel one deck is by the sheath layer that pure PET constituted, so whole fiber approaches pure PET fiber in nature.Therefore, technical staff under in the technology of the present invention field, teaching via specification of the present invention, just can think easily and, can be with the prepared recovery dacron fibre of the inventive method, according to different demands, further add existing additive in order to the constituent of making the sheath layer at this, for example, add titanium dioxide (TiO
2) wait material, can reach the effect of delustring.
Core-sheath-type dacron fibre of the present invention is prepared by the method for a dacron fibre whiteness that promote to reclaim as the aforementioned.
Preferably, this core-sheath-type dacron fibre is one to extend a silk (undrawing yarn; Abbreviate UDY as), half extends silk (partially orientedyarn; Abbreviate POY as), a false twist yarn (drawtextured yarn; Abbreviate DTY as) or a full silk (fully oriented yarn that extends; Abbreviate FOY as).
Embodiment:
The present invention will be described further with regard to following examples, but will be appreciated that described embodiment is the usefulness for illustrating only, and should not be interpreted as restriction of the invention process.
＜chemicals source 〉
1. the polyethylene terephthalate ester grain of Hui Shouing: available from the Far East new century; Model is CFF-290R.
2. pure dacron fibre: available from the Far East new century; Model is CSS-910.
＜instrument source 〉
1. spinning machine: available from toray company; Model is Toray-503.
2. beam split colour difference meter: available from MiniScan.
The assay method of＜dyeing mass-tone rate 〉
The mensuration of dyeing mass-tone rate be earlier with a plurality of by the made fabric of general pure PET fiber (standard yarn), respectively with a plurality of by the made weaving textile of fiber to be measured together, to obtain a plurality of specimen with half standard fabric and half fabric to be measured, dye with existing decoration method again, then, differentiate coloration of textile materials degree on the dyed specimen after intact with the artificial vision.When the color of fabric to be measured when being dark or shallow, then be categorized as D level or L level than the standard yarn; And can't distinguish variant person with standard yarn color, then be categorized as the M level.Calculate the ratio that the fabric that is classified as the M level accounts for whole samples at last, just can calculate the dyeing mass-tone rate of testing sample.For example, prepare 100 samples, wherein have 95 samples to be classified as the M level, then the dyeing mass-tone rate of determinand is 95%.
[preparation core-sheath-type dacron fibre]
＜embodiment 1 to 8 and comparative example 1 and 2 〉
The inventor is further according to the assay method of CNS L4060 method of testing and above-mentioned dyeing mass-tone rate, measure embodiment 1 to 8, with intensity, the degree of stretching and the mass-tone rate that dyes of the core-sheath-type dacron fibre of comparative example 1 and 2.In addition, the L value and the L of these fibrous finished products
bValue then is to use the beam split colour difference meter, and according to its operation manual measure and, and every result of gained is as shown in table 1 below after measuring.
＜embodiment 9 〉
Embodiment 9 is according to fiber cylindrical shown in the following table 1 and interior radius of a circle scale parameter, polyethylene terephthalate with the recovery of scheduled volume, with a constituent that contains the pure dacron fibre of the titanium dioxide of 2.4wt% and 97.6wt%, place respectively in two extruders of a spinning machine and carry out spinning, and then make a core-sheath-type dacron fibre.
The inventor also carries out the every property detection identical with embodiment 1 to the core-sheath-type dacron fibre of embodiment 9, and the result of gained is also recorded in following table 1.
As shown in Table 1, add titanium dioxide in the constituent of sheath layer, can't have influence on the effect of demand of the present invention, so also can be applied among the present invention.
＜comparative example 3 〉
Comparative example 3 is that a pure polyethylene terephthalate is placed a spinning machine, is spun to a dacron fibre.Similarly, the inventor also carries out the every property detection identical with embodiment 1 to the dacron fibre of comparative example 3, and the result of gained is also recorded in following table 1.
＜comparative example 4 〉
Comparative example 4 is that a polyethylene terephthalate that reclaims is placed a spinning machine, is spun to a dacron fibre.Similarly, the inventor also carries out the every property detection identical with embodiment 1 to the dacron fibre of comparative example 4, and the result of gained is also recorded in following table 1.
＜comparative example 5 〉
Comparative example 5 is the heavy pure polyethylene terephthalate and the polyethylene terephthalate of recovery such as to get, and after mixing, places a spinning machine fusion blending to become a dacron fibre.Similarly, the inventor also carries out the every property detection identical with embodiment 1 to the dacron fibre of comparative example 5, and the result of gained is also recorded in following table 1.
Table 1
| R 2/R 1 | Red Buddhist nun/radical | Intensity (g/d) | Degree of stretching (%) | The L value | L bValue | Dyeing mass-tone rate (%) | |
| |
1.11 | 120/36 | 2.78 | 125 | 85 | 4.0 | 91 |
| |
1.20 | 120/36 | 2.81 | 125 | 85 | 3.7 | 93 |
| Embodiment 3 | 1.29 | 120/36 | 2.82 | 125 | 86 | 3.6 | 95 |
| Embodiment 4 | 1.41 | 120/36 | 2.84 | 125 | 88 | 3.1 | 96 |
| Embodiment 5 | 1.58 | 120/36 | 2.86 | 125 | 87 | 2.9 | 96 |
| Embodiment 6 | 1.83 | 120/36 | 2.85 | 125 | 88 | 2.8 | 97 |
| Embodiment 7 | 2.00 | 120/36 | 2.86 | 125 | 88 | 2.8 | 97 |
| Embodiment 8 | 3.16 | 120/36 | 2.91 | 125 | 89 | 2.2 | 99 |
| Embodiment 9 | 1.41 | 125/36 | 2.8 | 130 | 88 | 3.5 | 95 |
| Comparative example 1 | 1.05 | 120/36 | 2.72 | 125 | 84 | 7.5 | 85 |
| Comparative example 2 | 7.07 | 120/36 | 2.91 | 125 | 89 | 2.2 | 99 |
| Comparative example 3 | - | 120/36 | 2.9 | 125 | 89 | 2.2 | 99 |
| Comparative example 4 | - | 125/36 | 2.5 | 125 | 62 | 10 | 65 |
| Comparative example 5 | - | 120/36 | 2.6 | 125 | 77 | 5.6 | 80 |
Annotate 1: comparative example 3 to 5 is because be not the core-sheath-type fiber, so there is not the ratio of R2/R1.
By last table 1 as can be seen, embodiment 1 to 9 prepared dacron fibre not only all can meet desired whiteness hue value of industry and L
bOutside the value, on dyeing mass-tone rate, excellent performance is arranged all also, and rerum naturas such as the intensity of described fiber and degree of stretching are also all suitable with pure dacron fibre.
In sum, the inventive method is utilized the core-sheath-type fibre structure, and use one to comprise the raw material of the constituent of a pure polyethylene terephthalate as the sheath layer, improve the whiteness of the existing dacron fibre that reclaims, its mainly be by control wherein the sandwich layer radius and the proportionate relationship of sheath layer thickness, that is to say the ratio of the radius of the interior radius of a circle of this fiber and cylindrical, and then taking into account under the feature of environmental protection and the every condition of cost, promote the whiteness of the dacron fibre that reclaims effectively, so can reach purpose of the present invention really.
Claims (7)
1. method that promotes the dacron fibre whiteness of recovery, it is characterized in that: this method is to be the polyethylene terephthalate of the recovery between 55 to 80 with a whiteness hue value, and one comprises that a whiteness hue value is the constituent of the polyethylene terephthalate between 85 to 95, carry out spinning with the composite fiber spinning machine, and then make a core-sheath-type dacron fibre, wherein, this sandwich layer is that the polyethylene terephthalate by this recovery is constituted, this sheath layer is made of this constituent, and the cross section of this fiber is to present a concentric circles, and this concentrically ringed interior radius of a circle R
1Radius R with cylindrical
2Relation as shown in the formula shown in (I):
1.11≤R
2/R
1≤4.48 (I)。
2. the method for the dacron fibre whiteness that lifting according to claim 1 is reclaimed, it is characterized in that: the whiteness hue value of the polyethylene terephthalate of this recovery is between 60 to 80.
3. the method for the dacron fibre whiteness that lifting according to claim 1 is reclaimed is characterized in that: in formula (I), and R
2/ R
1≤ 3.71.
4. the method for the dacron fibre whiteness that lifting according to claim 3 is reclaimed is characterized in that: in formula (I), and R
2/ R
1≤ 2.00.
5. the method for the dacron fibre whiteness that lifting according to claim 1 is reclaimed is characterized in that: the L of the polyethylene terephthalate of this recovery
bValue is between 10 to 4.
6. core-sheath-type dacron fibre is characterized in that: this fiber is that the method for the dacron fibre whiteness that reclaims by a lifting as claimed in claim 1 is prepared.
7. core-sheath-type dacron fibre according to claim 6 is characterized in that: this fiber be one extend silk, half extends silk, a false twist yarn or a full silk that extends.
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|---|---|---|---|
| CN 201010173539 CN102251318A (en) | 2010-05-17 | 2010-05-17 | Method for improving whiteness of recovered polyethylene terephthalate fiber and application thereof |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN 201010173539 CN102251318A (en) | 2010-05-17 | 2010-05-17 | Method for improving whiteness of recovered polyethylene terephthalate fiber and application thereof |
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|---|---|
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004131862A (en) * | 2002-10-09 | 2004-04-30 | Nippon Ester Co Ltd | Recycled polyester conjugated fiber |
| JP2006328600A (en) * | 2005-05-27 | 2006-12-07 | Nippon Ester Co Ltd | Recycled polyester conjugate fiber |
| CN101046006A (en) * | 2007-04-13 | 2007-10-03 | 浙江理工大学 | Functional polyester filament and its production process |
-
2010
- 2010-05-17 CN CN 201010173539 patent/CN102251318A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004131862A (en) * | 2002-10-09 | 2004-04-30 | Nippon Ester Co Ltd | Recycled polyester conjugated fiber |
| JP2006328600A (en) * | 2005-05-27 | 2006-12-07 | Nippon Ester Co Ltd | Recycled polyester conjugate fiber |
| CN101046006A (en) * | 2007-04-13 | 2007-10-03 | 浙江理工大学 | Functional polyester filament and its production process |
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Application publication date: 20111123 |