CN103421223A - Preparation method of high density polyethylene resin special for abnormal-shape bottles - Google Patents
Preparation method of high density polyethylene resin special for abnormal-shape bottles Download PDFInfo
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Abstract
The invention relates to a preparation method of high density polyethylene resin special for abnormal-shape bottles; in a granulation workshop section of a high density polyethylene device, 0.01-0.8% by mass percentage of a composite processing additive is added for direct preparation of the high density polyethylene resin special for the abnormal-shape bottles; the composite processing additive is prepared from the following substances: by mass, 10-20% of an antioxidant, 35-50% of a lubricant, 20-30% of a fluorine elastomer and 15-20% of oxidized polyethylene wax; the resin has the characteristics of moderate melt strength and wide molecular weight distribution, and the characteristics are necessary for a special material suitable for blowing the abnormal-shape bottles; the resin has excellent processing performances, and solves the problems that: during production of the abnormal-shape bottles by use of blend resin, the produced abnormal-shape bottles have unsmooth surfaces and uneven wall thickness, articles contained in the abnormal-shape bottles may produce peculiar smell, and the like.
Description
Technical field:
The present invention relates to the resin dedicated preparation method of a kind of HDPE special-shape bottle, product is mainly used in blowing good processability, sanitation performance is had relatively high expectations, appearance and modeling is special luxury food, drug packaging bottle field.
Background technology:
High density polyethylene(HDPE) (HDPE) has non-hygroscopic property because of it and water vapor is widely used in the blowing packaging field, has in recent years the wrapped product of special shape---special-shape bottle for blowing, and the desired raw material consumption increases year by year.
Due to the singularity of special-shape bottle profile, require system bottle raw material need there is good mobility and melt strength, with formability and the appearance requirement that meets special shape products.
At present, the special-shape bottle that abroad can produce as the hollow resin HDPE6400 of food product pack, due to much higher hard, cause the difficult sealing of bottle, and the raw material constant price is than domestic height; And domestic several hollow resins---HD5502FA, 5000B, 5300B etc. can't meet separately the production requirement of special-shape bottle, some system bottle producers are used two kinds in HD5502FA, 5000S, 7750, the resins for universal use such as 5300B, 5621D to produce in certain formula and ratio blending.
With blending resin, produce in the process of special-shape bottle, because quality fluctuation and raw material blending between the defect of the performance of raw material own, each batch are irregular, cause bottle base to be difficult to that moulding and flow velocity are unstable, product wall thickness is uneven, rough---there are orange peel line or cylinder ear place to have that deformation easily occurs bottle after streamline line, High Temperature Sterilization, article-containing has the shortcomings such as peculiar smell, system bottle cycle long production efficiency is low, processing temperature is high, energy consumption is high, yield rate is low, product cost is high, because of needs, two kinds of raw materials are carried out to blending simultaneously, increased workman's labour intensity.
In the process of manufacture of special-shape bottle, the molten property of hanging down of bottle base, stability are mainly determined by melt strength, too high melt strength can cause bottle base to be difficult to moulding, too low melt strength can cause again the bottle base in the bottle blowing process to tear, therefore the size of melt strength is an important character of materials processing characteristic while determining the special-shape bottle product molding, special-shape bottle, in the blowing process, need to have moderate melt strength; If will guarantee that raw material has good mobility simultaneously, good processability, this resin need have the wider characteristic of molecular weight distribution.
Widening of molecular weight distribution can improve the susceptibility of melt viscosity to shearing rate and shear-stress, makes polymer melt be easy to flow in screw slot and head; And, after parison leaves head and in the inflation process, higher viscosity and intensity are arranged again, to guarantee the smooth machine-shaping of special-shape bottle goods, therefore, resin dedicated molecular weight distribution is wide highly beneficial to extrusion and blow molding.
Certain polyolefine for structure, molecular weight and molecular weight distribution thereof have material impact to the processing characteristics of product and the use properties of goods, the high molecular partial polymer can improve the entanglement between polymer molecule, improve melt viscosity, the melt strength of polymkeric substance improves thereupon, and low molecular weight part is improved the processing characteristics of product.
Summary of the invention:
The purpose of this invention is to provide a kind of preparation method for the food grade high-density polyethylene resin of blowing special-shaped packing bottle.
Method of the present invention is the granulation workshop section at the HDPE device, by in the high density polyethylene(HDPE) base resin, adding composite auxiliary for processing, it is resin dedicated that special-shape bottle is produced in disposable polymerization, thereby the system that is through with bottle needs the history of two kinds of raw material blending in producing, avoided the defect of the performance of blended feedstock own and the variety of issue occurred in special-shape bottle blowing process that raw material blending inequality causes.
The add-on of composite auxiliary for processing is 0.01～0.8%(mass percent with respect to high density polyethylene(HDPE)), composite auxiliary for processing by oxidation inhibitor, lubricant, fluoroelastomer and oxidized polyethlene wax by 10～20/35～50/20～30/15～20(mass percent) composite forming.
Oxidation inhibitor is one or more in phenolic antioxidant, phosphite ester kind antioxidant, monothioester kind antioxidant, and its quality per distribution ratio is 50-80/10-30/10-20.
Phenolic antioxidant is four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, β-(3, the 5-di-tert-butyl-hydroxy phenyl) the positive octadecanol ester of propionic acid, N, N '-1,6-inferior hexyl-bis-[3-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid amide] in a kind of, auxiliary antioxidant is tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) one or more in ester, two (2,4-DTBP) pentaerythritol diphosphites, Tyox B, the two stearyl alcohol esters of thio-2 acid.
Lubricant is the stearate compounds, is a kind of in calcium stearate, Zinic stearas and barium stearate.
Being prepared as follows of oxidized polyethlene wax:
(1) with the heating jacket enamel still, being heated to 60 ℃;
(2) the sheet low molecular weight polyethylene is joined in enamel still, pass into oxygen, cover feeding cover sealing, open the stirring rake in enamel still, speed with 3 ℃/min starts heat temperature raising simultaneously, under 110～120 ℃, and constant temperature continuously stirring 40min;
(3) liquid in above-mentioned (2) is sent into to prilling tower, open air cooling system, carry out mist projection granulating;
(4) product after granulation is sieved and removes micro mist, be prepared into the oxidized polyethlene wax that required particle diameter is 2.0 ± 0.2mm.
Oxidized polyethlene wax outward appearance prepared by aforesaid method is white particles, and particle diameter is even, mobility, dispersed splendid, have that viscosity is low, softening temperature is high, nontoxic, Heat stability is good, the characteristics that high-temperature volatile is low, existing extremely excellent external lubrication, have again stronger internal lubrication effect, with high density polyethylene(HDPE), good consistency is arranged, anti humility performance at normal temperatures is good, and the chemical-resistant resistance ability is strong, can improve the finished product outward appearance, improve the production of articles working (machining) efficiency, reduce production costs.
After composite oxidation inhibitor, lubricant, fluoroelastomer and oxidized polyethlene wax, directly, in the granulation workshop section of HDPE device joins base resin, need not be transformed original device, the present invention is workable, the resin dedicated constant product quality of production.
High-density polyethylene resin prepared by the present invention has the following advantages:
(1) in the Raw material processing process, melt strength is moderate;
(2) molecular weight distribution is wider, easily processing;
(3) sanitation performance meets the FDA standard, reaches polyethylene packaging material national standard requirement for food;
(4) processing characteristics of raw material and use properties reach overall equilbrium.
That with the present invention, produces is resin dedicated, meets the performance requriements of special-shape bottle process for processing to raw material fully, has solved the problems that exist in blending resin bottle blowing process.
Embodiment:
Embodiment 1～12nd, in HDPE device granulation workshop section, adds 0.01～0.8%(mass percent) composite auxiliary for processing, directly prepare the HDPE special-shape bottle resin dedicated.
Embodiment 1
Composite antioxidant is the 60/24/16(mass percent by four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester, Tyox B by proportioning) formulated.
On the HDPE device, in base resin, add by oxidation inhibitor, lubricant stearic acid calcium, fluoroelastomer and oxidized polyethlene wax according to the 10/50/20/20(mass percent) composite special-purpose processing aid, addition is the 0.6%(mass percent), melt extrude granulation in forcing machine, directly prepare the high density polyethylene(HDPE) special-shape bottle resin dedicated.
The test of the resin dedicated Physical Property Analysis of gained in Table 1, post-treatment the results are shown in Table 2.
Embodiment 2
Composite antioxidant is the 60/24/16(mass percent by four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, pentaerythritol bis-phosphite two (stearyl alcohol) ester, Tyox B by proportioning) formulated.
On the HDPE device, in base resin, add by oxidation inhibitor, lubricant stearic acid calcium, fluoroelastomer and oxidized polyethlene wax according to the 10/50/20/20(mass percent) the composite specific complex processing aid of ratio, addition is the 0.6%(mass percent), melt extrude granulation in forcing machine, directly prepare the high density polyethylene(HDPE) special-shape bottle resin dedicated.
The test of the resin dedicated Physical Property Analysis of gained in Table 1, post-treatment the results are shown in Table 2.
Embodiment 3
Composite antioxidant is the 60/24/16(mass percent by β-positive ten caprylates of (3,5-di-tert-butyl-hydroxy phenyl) propionic acid, tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester, Tyox B by proportioning) formulated.
On the HDPE device, in base resin, add by oxidation inhibitor, lubricant stearic acid calcium, fluoroelastomer and oxidized polyethlene wax according to the 10/50/20/20(mass percent) the composite specific complex processing aid of ratio, addition is the 0.6%(mass percent), melt extrude granulation in forcing machine, directly prepare the high density polyethylene(HDPE) special-shape bottle resin dedicated.
The test of the resin dedicated Physical Property Analysis of gained in Table 1, post-treatment the results are shown in Table 2.
Embodiment 4
Composite antioxidant by β-positive ten caprylates of (3,5-di-tert-butyl-hydroxy phenyl) propionic acid, pentaerythritol bis-phosphite two (stearyl alcohol) ester, Tyox B by proportioning is: the 60/24/16(mass percent) formulated.
On the HDPE device, in base resin, add by oxidation inhibitor, lubricant stearic acid calcium, fluoroelastomer and oxidized polyethlene wax according to the 10/50/20/20(mass percent) the composite specific complex processing aid of ratio, addition is the 0.6%(mass percent), in forcing machine, melt extrude, granulation, directly prepare the high density polyethylene(HDPE) special-shape bottle resin dedicated.
The test of the resin dedicated Physical Property Analysis of gained in Table 1, post-treatment the results are shown in Table 2.
Embodiment 5
Composite antioxidant is the 65/19/16(mass percent by four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester, Tyox B by proportioning) formulated.
On the HDPE device, in base resin, add by oxidation inhibitor, lubricant stearic acid zinc, fluoroelastomer and oxidized polyethlene wax according to the 15/40/30/15(mass percent) the composite specific complex processing aid of ratio, addition is the 0.3%(mass percent), melt extrude granulation in forcing machine, directly prepare the high density polyethylene(HDPE) special-shape bottle resin dedicated.
The test of the resin dedicated Physical Property Analysis of gained in Table 1, post-treatment the results are shown in Table 2.
Embodiment 6
Composite antioxidant is the 65/19/16(mass percent by four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, pentaerythritol bis-phosphite two (stearyl alcohol) ester, Tyox B by proportioning) formulated.
On the HDPE device, in base resin, add by oxidation inhibitor, lubricant stearic acid zinc, fluoroelastomer and oxidized polyethlene wax according to the 15/40/30/15(mass percent) the composite specific complex processing aid of ratio, addition is the 0.3%(mass percent), melt extrude granulation in forcing machine, directly prepare the high density polyethylene(HDPE) special-shape bottle resin dedicated.
The test of the resin dedicated Physical Property Analysis of gained in Table 1, post-treatment the results are shown in Table 2.
Embodiment 7
Composite antioxidant is the 65/19/16(mass percent by β-positive ten caprylates of (3,5-di-tert-butyl-hydroxy phenyl) propionic acid, tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester, Tyox B by proportioning) formulated.
On the HDPE device, in base resin, add by oxidation inhibitor, lubricant stearic acid zinc, fluoroelastomer and oxidized polyethlene wax according to the 15/40/30/15(mass percent) the composite specific complex processing aid of ratio, addition is the 0.3%(mass percent), melt extrude granulation in forcing machine, directly prepare the high density polyethylene(HDPE) special-shape bottle resin dedicated.
The test of the resin dedicated Physical Property Analysis of gained in Table 1, post-treatment the results are shown in Table 2.
Embodiment 8
Composite antioxidant is the 65/19/16(mass percent by β-positive ten caprylates of (3,5-di-tert-butyl-hydroxy phenyl) propionic acid, pentaerythritol bis-phosphite two (stearyl alcohol) ester, Tyox B by proportioning) formulated.
On the HDPE device, in base resin, add by oxidation inhibitor, lubricant stearic acid zinc, fluoroelastomer and oxidized polyethlene wax according to the 15/40/30/15(mass percent) the composite specific complex processing aid of ratio, addition is the 0.3%(mass percent), in forcing machine, melt extrude, granulation, directly prepare the high density polyethylene(HDPE) special-shape bottle resin dedicated.
The test of the resin dedicated Physical Property Analysis of gained in Table 1, post-treatment the results are shown in Table 2.
Embodiment 9
Composite antioxidant is the 70/17/13(mass percent by four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester, Tyox B by proportioning) formulated.
On the HDPE device, in base resin, add by oxidation inhibitor, lubricant stearic acid calcium, fluoroelastomer and oxidized polyethlene wax according to the 20/35/30/15(mass percent) the composite specific complex processing aid of ratio, addition is the 0.1%(mass percent), melt extrude granulation in forcing machine, directly prepare the high density polyethylene(HDPE) special-shape bottle resin dedicated.
The test of the resin dedicated Physical Property Analysis of gained in Table 1, post-treatment the results are shown in Table 2.
Embodiment 10
Composite antioxidant is the 70/17/13(mass percent by four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, pentaerythritol bis-phosphite two (stearyl alcohol) ester, Tyox B by proportioning) formulated.
On the HDPE device, in base resin, add by oxidation inhibitor, lubricant stearic acid calcium, fluoroelastomer and oxidized polyethlene wax according to the 20/35/30/15(mass percent) the composite specific complex processing aid of ratio, addition is the 0.1%(mass percent), melt extrude granulation in forcing machine, directly prepare the high density polyethylene(HDPE) special-shape bottle resin dedicated.
The test of the resin dedicated Physical Property Analysis of gained in Table 1, post-treatment the results are shown in Table 2.
Embodiment 11
Composite antioxidant is the 70/17/13(mass percent by β-positive ten caprylates of (3,5-di-tert-butyl-hydroxy phenyl) propionic acid, tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester, Tyox B by proportioning) formulated.
On the HDPE device, in base resin, add by oxidation inhibitor, lubricant stearic acid zinc, fluoroelastomer and oxidized polyethlene wax according to the 20/35/30/15(mass percent) the composite specific complex processing aid of ratio, addition is the 0.1%(mass percent), melt extrude granulation in forcing machine, directly prepare the high density polyethylene(HDPE) special-shape bottle resin dedicated.
The test of the resin dedicated Physical Property Analysis of gained in Table 1, post-treatment the results are shown in Table 2.
Embodiment 12
Composite antioxidant is the 70/17/13(mass percent by β-positive ten caprylates of (3,5-di-tert-butyl-hydroxy phenyl) propionic acid, pentaerythritol bis-phosphite two (stearyl alcohol) ester, Tyox B by proportioning) formulated.
On the HDPE device, in base resin, add by oxidation inhibitor, lubricant stearic acid zinc, fluoroelastomer and oxidized polyethlene wax according to the 20/35/30/15(mass percent) the composite specific complex processing aid of ratio, addition is the 0.1%(mass percent), in forcing machine, melt extrude, granulation, directly prepare the high density polyethylene(HDPE) special-shape bottle resin dedicated.
The test of the resin dedicated Physical Property Analysis of gained in Table 1, post-treatment the results are shown in Table 2.
Comparative Examples 1
Get high density polyethylene(HDPE) 5000S, two kinds of raw materials of 5300B by the 50/50(mass percent) the blending granulation.
The test of gained resin characteristics is in Table 1, and post-treatment the results are shown in Table 2.
Comparative Examples 2
Get high density polyethylene(HDPE) 5000S, two kinds of raw materials of HD5502FA by the 70/30(mass percent) the blending granulation.
The test of gained resin characteristics is in Table 1, and post-treatment the results are shown in Table 2.
From table 1 embodiment 1～12, can find out, the resin dedicated preparation method of a kind of HDPE special-shape bottle of the present invention, do not need two kinds of raw material blending, the resin dedicated of preparation has that melt strength is moderate, molecular weight distribution is wider, resin dedicated n-hexane extract is lower than blending resin, and sanitation performance all meets used for packing foods polyethylene national standard (GB9691).
What with the present invention, prepare is resin dedicated on dissimilar equipment, for several bottles that are difficult to most moulding, has carried out the processed and applied test, and test-results is in Table 2.
As can be seen from Table 2: this is resin dedicated has avoided the deficiency of the performance of blended feedstock own and the bottle base produced in special-shape bottle blowing process that raw material blending inequality causes to be difficult to that moulding, flow velocity shakiness, inhomogeneity of wall thickness, bottle are rough, article-containing has the problems such as peculiar smell.In system bottle process, the melt form is good, after the flexible free from extraneous odour of parison,, Se Bai good without sagging, product surface glossiness and even, flawless,, sterilization strong without bubble, inclusion-free, sealing without sunken bottom, cooling rear without after depression phenomenon, special-shape bottle finished product refrigeration 24h, fall without damaged, vertical carry press high, piling good, the anti-extruding of bottling is far above the goods technical requirement, the special-shape bottle quality of item obtains customer's approval.
With resin dedicated production special-shape bottle, than with blending resin production, same bottle has reduced the raw material consumption, processing temperature is low, has reduced energy consumption, can be the user every year and saved a large amount of production costs, and owing to having reduced raw material blending process, reduced labor strength, be subject to the user and welcome.
Table 1
Table 2
Annotate: it is example that table 1, table 2 data be take blowing 125ML ears types " refreshing askew ".
Claims (7)
1. the preparation method that the high density polyethylene(HDPE) special-shape bottle is resin dedicated, it is characterized in that: in the granulation workshop section of high density polyethylene device, add by mass percentage 0.01～0.8% specific complex processing aid directly to prepare the high density polyethylene(HDPE) special-shape bottle resin dedicated; Composite auxiliary for processing is prepared according to 10～20/35～50/20～30/15～20 mass percents by oxidation inhibitor, lubricant, fluoroelastomer and oxidized polyethlene wax.
2. the resin dedicated preparation method of a kind of high density polyethylene(HDPE) special-shape bottle according to claim 1, it is characterized in that: described oxidation inhibitor is phenolic antioxidant, one or more in phosphorous acid esters, monothioester class auxiliary antioxidant, its proportioning is 50-80/10-30/10-20 by mass percentage.
3. the resin dedicated preparation method of a kind of high density polyethylene(HDPE) special-shape bottle according to claim 2, it is characterized in that: described phenolic antioxidant is four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, β-(3, the 5-di-tert-butyl-hydroxy phenyl) the positive octadecanol ester of propionic acid, N, N '-1, a kind of in 6-hexylidene-bis-[3-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid amide].
4. the resin dedicated preparation method of a kind of high density polyethylene(HDPE) special-shape bottle according to claim 2, it is characterized in that: described auxiliary antioxidant is tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) one or more in ester, two (2,4-DTBP) pentaerythritol diphosphites, Tyox B, the two stearyl alcohol esters of thio-2 acid.
5. the resin dedicated preparation method of a kind of high density polyethylene(HDPE) special-shape bottle according to claim 1, it is characterized in that: described lubricant is the stearate compounds, is a kind of in calcium stearate, Zinic stearas or barium stearate.
6. the resin dedicated preparation method of a kind of high density polyethylene(HDPE) special-shape bottle according to claim 1, it is characterized in that: the low molecular weight polyethylene that described oxidized polyethlene wax is partial oxidation, on molecular chain with carboxyl and hydroxyl, the white particles that diameter is 2.0 ± 0.2mm.
7. according to the resin dedicated preparation method of a kind of high density polyethylene(HDPE) special-shape bottle of claim 6, it is characterized in that: 50～70 ℃ of the preheating temperatures of the enamel still with heating jacket of preparation oxidized polyethlene wax, the thermostatically heating temperature is 100～130 ℃, and churning time is 30～50min.
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| CN107118419A (en) * | 2017-06-05 | 2017-09-01 | 广州市永乐塑料制品有限公司 | A kind of production method of medicinal polyethylene bottle |
| CN107286421A (en) * | 2016-04-13 | 2017-10-24 | 中国石油天然气股份有限公司 | The automotive oil tank polyethylene composition of gas fluidized-bed process production |
| CN111286109A (en) * | 2020-04-17 | 2020-06-16 | 上海赛科石油化工有限责任公司 | Preparation method of anti-yellowing high-density polyethylene |
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| CN107286421A (en) * | 2016-04-13 | 2017-10-24 | 中国石油天然气股份有限公司 | The automotive oil tank polyethylene composition of gas fluidized-bed process production |
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| CN111286109A (en) * | 2020-04-17 | 2020-06-16 | 上海赛科石油化工有限责任公司 | Preparation method of anti-yellowing high-density polyethylene |
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| CN103421223B (en) | 2016-04-06 |
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