CN103160007B - A kind of air permeable polyolefin master batch and preparation method thereof - Google Patents
A kind of air permeable polyolefin master batch and preparation method thereof Download PDFInfo
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- CN103160007B CN103160007B CN201110422757.6A CN201110422757A CN103160007B CN 103160007 B CN103160007 B CN 103160007B CN 201110422757 A CN201110422757 A CN 201110422757A CN 103160007 B CN103160007 B CN 103160007B
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Abstract
The invention discloses a kind of air permeable polyolefin master batch, it is as follows in the composition of raw materials of weight proportion: polyolefin resin 45 ~ 55%; Mineral filler 45 ~ 55%; The Shui being the described air permeable polyolefin master batch that raw material obtains by described polyolefin resin and mineral filler divides Han Liang≤300ppm.Correspondingly, the invention discloses a kind of preparation method of air permeable polyolefin master batch, described air permeable polyolefin master batch is without the need to through drying process, by regulating the temperature of water coolant, control the surface temperature of particle after vibratory screening apparatus, use the mode of multiple tracks airduct conveying, remove air-permeable masterbatch moisture content.Adopt the present invention, air permeable polyolefin master batch physical and chemical performance is good, greatly reduce its moisture content, simplify production process, reduce energy consumption, meet the requirement of follow-up masking, ensure the Quality and yield of product, avoid outward appearance and physicals, the pH value of the excessive follow-up obtained film of moisture content impact, even produce the unfavorable conditions such as holes.
Description
Technical field
The present invention relates to new material technology field, particularly a kind of air permeable polyolefin master batch and preparation method thereof.
Background technology
Polyolefin permeable membrane is succeeded in developing by Japan the earliest, after import Korea S, Taiwan into.This technology obtains very large development in Korea S, and its equipment and technology technology is also greatly improved.Last century, this technology of the nineties started to import China into, and because Chinese market demand is large, the prospect of numerous domestic enterprise this product all very good, numerous and confused investment is to this field.
Air-permeable envelope is called as " film that can breathe " because of the feature of a permeable watertight.This air-permeable envelope can by polyolefin resin and the granulation of a certain proportion of mineral filler mixture, through casting machine or inflation film manufacturing machine shaping after stretched operation again, make to form hole around mineral filler, these apertures are very little, the small molecules only having the free state such as air molecule or water vapour just by, and between liquid water molecules because of have Van der Waals force effect and not by.
Air-permeable envelope is widely used because of its characteristic " can breathed ".Personal hygiene article is applied to, as sanitary napkin, protection pad, paper diaper for infant, adult diaper etc. in daily life; Medical and medical aspect, as protective clothing, medical sheet, disposable surgical clothing etc.; Be widely used in the fields such as environmental protection, building, smelting in addition.
Chinese patent application CN02116720.6 discloses a kind of preparation and method of polyolefine resin specially for permeating curtain coated film, base oneself upon domestic polyolefin resin (LDPE, LLDPE, copolymerization PP tri-kinds are composite) and fine mineral filler (calcium carbonate, talcum powder etc., particle diameter 3 ~ l0 μm) be main raw material, add Ti-Al composite coupler, POE properties-correcting agent, OPE dispersion agent, through coupling processing, increase-volume disperses, banburying and extrude pelletizing processes and form.
Chinese patent application 200910176457.7 discloses a kind of ultra-thin, high porosity film and preparation thereof
Method.By weight percentage, be made up of following material: PE (LDPE/LLDPE): 40% ~ 50%, calcium carbonate: 45% ~ 55%, modified additive (plasticity auxiliary agent and film coalescence aid): 3% ~ 5%.The manufacturing process flow of air-permeable envelope masterbatch is wherein: add calcium carbonate after the polyolefine melting of recipe ratio, and through high-speed stirring, twin-screw extruder melting, cooling and dicing, makes after drying and dehydrating.
In follow-up numerous film manufacturer production processes, the water content of air-permeable envelope master batch directly can have influence on the quality, output, pH value etc. of product.Above two patent application technology all do not describe the drying means to air-permeable masterbatch in air-permeable masterbatch granulation process in detail.General air-permeable masterbatch manufacturer can adopt the mode of water cooling bracing pelletizing, and this mode needs more operator, inevitably causes waste material during draping, wastes very large.The water temperature of the cold rinse bank that water cooling bracing pelletizing adopts is uncontrollable, and the temperature in winter and summer differs widely.Obtain air permeable polyolefin master batch just finished product through water cooling bracing pelletizing, then need to adopt drying installation to dewater.Air-permeable masterbatch from dual-screw pelletizer temperature out generally more than 200 DEG C; pelletizing after water cooling bracing is cooled to about 30 DEG C; 90 DEG C of removing moisture content are warming up to again with drying machine; air-permeable masterbatch experience temperature be 200 DEG C to 30 DEG C again to 90 DEG C; intensification again of lowering the temperature can increase unnecessary energy consumption, and purchasing of fabric dryer adds production cost simultaneously.And ventilative masterbatch generally all needs through water cooling in granulation process, and surface can bring moisture content into.Moisture content in follow-up film-forming process in air-permeable masterbatch can affect outward appearance and the physicals of film, even produces holes.
In order to reduce the water content in air-permeable masterbatch, mixture water-absorbing dry drying prescription in air-permeable masterbatch formula can be selected by some producers, but the water-absorbing dry drying prescription added containing calcium oxide can cause the pH value of film solution to significantly improve, and have impact on use range; The some meetings drying machine again method such as dry, but use drying machine again drying can increase energy consumption, increase operation, affect efficiency.
Prior art generally adopts grain size to be the mineral filler of 3 microns ~ 10 microns, and the present invention adopts grain size to be 0. 3 microns ~ 12 microns, is preferably the high filler loading capacity fine mineral filler of 0. 5 microns ~ 10 microns.Compared with prior art, the present invention can utilize the dispersing uniformity of high filler loading capacity fine mineral filler better, improves its mechanical property and processing characteristics, meets follow-up requirement and the service requirements of preparing the process for processing of film.
The main raw material formula of described air permeable polyolefin master batch also comprises:
Processing aid 0.01 ~ 2%;
Oxidation inhibitor 0.01 ~ 2%;
Preferably, the main raw material formula of described air permeable polyolefin master batch also comprises:
Processing aid 0.1 ~ 1%;
Oxidation inhibitor 0.1 ~ 1%.
Described processing aid is one in PE wax, E wax, calcium stearate, Zinic stearas, Magnesium Stearate, rare earth class lubricant or combination;
Described oxidation inhibitor is one or both the compound in Hinered phenols antioxidant and phosphite ester kind antioxidant.
More preferably, a kind of air permeable polyolefin master batch of the present invention, it is as follows in the main raw material formula of weight proportion:
Polyolefin resin 45 ~ 65%;
Mineral filler 45 ~ 65%;
Processing aid 0.1 ~ 1%;
Oxidation inhibitor 0.1 ~ 1%.
As shown in Figure 1, the embodiment of the present invention additionally provides a kind of preparation method of air permeable polyolefin master batch, comprising:
S100, will put in parallel dual-screw tablets press through pretreated mixing raw material, extrude pelletizing and obtain air permeable polyolefin master batch, and wherein, described tablets press adopts the mode of underwater cutpellet, and the water temperature of described underwater cutpellet controls at 75 ~ 95 DEG C.
The length-to-diameter ratio of described tablets press is 35 ~ 50;
Wherein, the temperature distribution of described tablets press barrel is as follows: 170 ~ 180 DEG C, a district, two 190 ~ 195 DEG C, districts of 180 ~ 190 DEG C three, district, four 180 ~ 190 DEG C, districts, five 175 ~ 185 DEG C, districts, six 180 ~ 190 DEG C, districts, seven 190 ~ 200 DEG C, districts, die head 200 ~ 220 DEG C.
Wherein, the vacuum tightness in described tablets press barrel the 6th district is set to-0.2 MPa ~-0.01MPa.
Preferably, the vacuum tightness in described tablets press barrel the 6th district is set to-0.1 MPa ~-0.02MPa.
The present invention by being provided with venting hole above tablets press barrel the 6th district, and venting hole connects vacuum pump, thus realize controlling the object that vacuum tightness is-0.2 MPa ~-0.01MPa.
It should be noted that, the draping mode of tablets press is hydraulic pressure net switching, and it has two web plate mouths to be used alternatingly.
The water temperature range 75 ~ 95 DEG C of underwater cutpellet by but be not limited to the accurate control that temperature regulating device realizes water temperature, thus ensure that the temperature of air permeable polyolefin master batch is not less than 75 DEG C.
S101, is separated described air permeable polyolefin master batch by the material water separator of propeller type from water.
The temperature that air permeable polyolefin master batch is separated from water controls at 75 ~ 95 DEG C.
By the screening of vibratory screening apparatus, by the air permeable polyolefin master batch segregation excision beyond specification, air permeable polyolefin master batch up to specification can also be left after air permeable polyolefin master batch is separated from water.
S102, by the described air permeable polyolefin master batch through being separated by 2 ~ 7 road Cemented filling, described per pass pipeline is provided with independently blower fan.
Per pass pipeline is provided with independently blower fan, can ensure that the moisture of former process can not have influence on next procedure.
Preferably, the described air permeable polyolefin master batch through being separated is passed through 3 ~ 5 road Cemented filling.
Wherein, described pipeline is stainless steel pipes;
Described pipeline external parcel the foam material thermal insulation layer for keeping homo(io)thermism, to keep material temperature can not rapid drawdown;
Long 2 ~ 10 meters of described per pass pipeline, preferably, long 3 ~ 6 meters of per pass pipeline;
The end of described per pass pipeline is provided with the opening funnel for collection material.
Opening funnel arranges the end of per pass pipeline, and its collection material is to enter next transportation section.
It should be noted that, pipeline should be straight as far as possible, reduces the frictional force of pipeline material conveying, reduce the energy consumption produced because of frictional force.
S103, under the condition of Liao Wen≤60 of described air permeable polyolefin master batch DEG C, collects and packs, obtaining the described air permeable polyolefin master batch that Shui divides Han Liang≤300ppm.
Preferably, air permeable polyolefin master batch under the condition of Liao Wen≤70 DEG C, can be collected and also pack with aluminium plastic bag, obtain the described air permeable polyolefin master batch that Shui divides Han Liang≤200ppm.
The packaging temp of air-permeable masterbatch controls more than 70 DEG C, to ensure that the moisture content that particle does not absorb in air is just packed.The temperature of air-permeable masterbatch experience is 200 DEG C and is down to 70 DEG C, concerning ventilative particle, does not just again heat to ventilative particle, do not increase unnecessary energy consumption since machine is out rear.
Composition graphs 2 and Fig. 3, embodiments provide the preparation method of another kind of air permeable polyolefin master batch, comprising:
S200, joins 40 ~ 70% polyolefin resines, 0.01 ~ 2% processing aid and 0.01 ~ 2% oxidation inhibitor in high speed mixer and is uniformly mixed 5 ~ 20 minutes, obtain mixture, and the rotating speed of described high speed mixer is 800 ~ 1200 revs/min.
Preferably, 45 ~ 65% polyolefin resines, 0.1 ~ 1% processing aid and 0. 1 ~ 1% oxidation inhibitor are joined in high speed mixer and be uniformly mixed 10 minutes, the rotating speed of described high speed mixer is 1000 revs/min.
40 ~ 70% mineral fillers are joined in homogenizer by S201, continue to be uniformly mixed 10 ~ 25 minutes with described mixture, obtain through pretreated mixing raw material, and the rotating speed of described high speed mixer is 800 ~ 1200 revs/min.
Preferably, join in homogenizer by 45 ~ 65% mineral fillers, continue to be uniformly mixed 15 minutes with described mixture, the rotating speed of described high speed mixer is 1000 revs/min.
S202, will put in parallel dual-screw tablets press through pretreated mixing raw material, extrude pelletizing and obtain air permeable polyolefin master batch, and wherein, described tablets press adopts the mode of underwater cutpellet, and the water temperature of described underwater cutpellet controls at 75 ~ 95 DEG C.
The length-to-diameter ratio of described tablets press is 35 ~ 50;
Wherein, the temperature distribution of described tablets press barrel is as follows: 170 ~ 180 DEG C, a district, two 190 ~ 195 DEG C, districts of 180 ~ 190 DEG C three, district, four 180 ~ 190 DEG C, districts, five 175 ~ 185 DEG C, districts, six 180 ~ 190 DEG C, districts, seven 190 ~ 200 DEG C, districts, die head 200 ~ 220 DEG C.
Wherein, the vacuum tightness in described tablets press barrel the 6th district is set to-0.2 MPa ~-0.01MPa.
Preferably, the vacuum tightness in described tablets press barrel the 6th district is set to-0.1 MPa ~-0.02MPa.
The present invention by being provided with venting hole above tablets press barrel the 6th district, and venting hole connects vacuum pump, thus realize controlling the object that vacuum tightness is-0.2 MPa ~-0.01MPa.
It should be noted that, the draping mode of tablets press is hydraulic pressure net switching, and it has two web plate mouths to be used alternatingly.
The water temperature range 75 ~ 95 DEG C of underwater cutpellet by but be not limited to the accurate control that temperature regulating device realizes water temperature, thus ensure that the temperature of air permeable polyolefin master batch is not less than 75 DEG C.
S203, is separated described air permeable polyolefin master batch by the material water separator of propeller type from water.
The temperature that air permeable polyolefin master batch is separated from water controls at 75 ~ 95 DEG C.
S204, by the screening of vibratory screening apparatus after air permeable polyolefin master batch is separated from water.
By the screening of vibratory screening apparatus, by the air permeable polyolefin master batch segregation excision beyond specification, leave air permeable polyolefin master batch up to specification.
S205, by the described air permeable polyolefin master batch through being separated by 3 ~ 5 road Cemented filling, described per pass pipeline is provided with independently blower fan.
Per pass pipeline is provided with independently blower fan, can ensure that the moisture of former process can not have influence on next procedure.
Wherein, described pipeline is stainless steel pipes;
Described pipeline external parcel the foam material thermal insulation layer for keeping homo(io)thermism, to keep material temperature can not rapid drawdown;
Long 3 ~ 6 meters of described per pass pipeline;
The end of described per pass pipeline is provided with the opening funnel for collection material.
Opening funnel arranges the end of per pass pipeline, and its collection material is to enter next transportation section.
It should be noted that, pipeline should be straight as far as possible, reduces the frictional force of pipeline material conveying, reduce the energy consumption produced because of frictional force.
The schematic diagram of stainless steel transport pipe as shown in Figure 3, comprises 3 road stainless steel transport pipes.Wherein, each pipeline 1 is arranged in horizontal direction, and per pass pipeline 1 is provided with independently blower fan 2, long 3 ~ 6 meters of pipeline 1, the end of pipeline 1 is provided with the opening funnel 3 for collection material, and opening funnel 3 is also venting port, and pipeline 1 external parcel the foam material thermal insulation layer for keeping homo(io)thermism.
It should be noted that, first pipeline charging place 4 connects the feed opening of separator or vibratory screening apparatus, and last deferent way discharging device place connects holding tank.
S206, under the condition of Liao Wen≤60 of described air permeable polyolefin master batch DEG C, collects, and by finished product packing, obtains the described air permeable polyolefin master batch that Shui divides Han Liang≤300ppm in holding tank.
Preferably, air permeable polyolefin master batch under the condition of Liao Wen≤70 DEG C, can be collected and also pack with aluminium plastic bag, obtain the described air permeable polyolefin master batch that Shui divides Han Liang≤200ppm.
The packaging temp of air-permeable masterbatch controls more than 70 DEG C, to ensure that the moisture content that particle does not absorb in air is just packed.The temperature of air-permeable masterbatch experience is 200 DEG C and is down to 70 DEG C, concerning ventilative particle, does not just again heat to ventilative particle, do not increase unnecessary energy consumption since machine is out rear.
Technical indicator detection is carried out to air permeable polyolefin master batch of the present invention below, and compares with versatility product index in industry, testing method and detect data as shown in Table 1:
As seen from the above table, the water content of air permeable polyolefin master batch of the present invention is <200ppm, compared with prior art universal product index water content <600ppm, its moisture content decreases 400 ppm, namely reduce 66.7%, water content obviously significantly reduces.And other indexs are all improved, wherein, compared with prior art, air permeable polyolefin master batch melting index of the present invention adds 0.6 g/10min, tensile strength adds 1 MPa, fracture extension rate adds 20%, and then performance index are close for ash content, flexural strength, modulus in flexure, Izod notched impact strength etc.
The present invention is further illustrated below with specific embodiment.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, a kind of air permeable polyolefin master batch and preparation method thereof is provided, described air permeable polyolefin master batch is without the need to through drying process, by regulating the temperature of water coolant, control the surface temperature of particle after vibratory screening apparatus, use the mode of multiple tracks airduct conveying, reach and remove air-permeable masterbatch moisture content, make its Shui divide Han Liang≤300ppm, physical and chemical performance is good.
For reaching above-mentioned technique effect, embodiments provide a kind of air permeable polyolefin master batch, it is as follows in the main raw material formula of weight proportion:
Polyolefin resin 40 ~ 70%;
Mineral filler 40 ~ 70%;
The Shui being the described air permeable polyolefin master batch that main raw material obtains by described polyolefin resin and mineral filler divides Han Liang≤300ppm;
Wherein, described polyolefin resin is one in Low Density Polyethylene, high density polyethylene(HDPE), linear low density polyethylene, metallocene PE, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, homo-polypropylene or combination;
Described mineral filler is one in water-ground limestone, light calcium carbonate, barium sulfate, calcium sulfate, talcum powder, wollastonite, silicon-dioxide, calcium oxide or combination.
As the improvement of such scheme, the Shui being the described air permeable polyolefin master batch that main raw material obtains by described polyolefin resin and mineral filler divides Han Liang≤200ppm;
The density of described Low Density Polyethylene is 0.910 ~ 0.935g/cm
3;
The density of described high density polyethylene(HDPE) is 0.940 ~ 0.980g/cm
3;
The density of described linear low density polyethylene is 0.910-0.940 g/cm
3;
The melting index of described metallocene PE is 1 ~ 6 g/10min;
The melting index of described ethylene-octene copolymer is 2 ~ 4 g/10min;
Vinyl acetate content in described ethylene-vinyl acetate copolymer is 5% ~ 40%.
As the improvement of such scheme, described mineral filler is ultra-fine inorganic filler, and its grain size is 0. 3 microns ~ 12 microns.
As the improvement of such scheme, the main raw material formula of described air permeable polyolefin master batch also comprises:
Processing aid 0.01 ~ 2%;
Oxidation inhibitor 0.01 ~ 2%;
Described processing aid is one in PE wax, E wax, calcium stearate, Zinic stearas, Magnesium Stearate, rare earth class lubricant or combination;
Described oxidation inhibitor is one or both the compound in Hinered phenols antioxidant and phosphite ester kind antioxidant.
Correspondingly, embodiments provide a kind of preparation method of air permeable polyolefin master batch, described preparation method comprises the following steps:
To put in parallel dual-screw tablets press through pretreated mixing raw material, and extrude pelletizing and obtain air permeable polyolefin master batch, wherein, described tablets press adopts the mode of underwater cutpellet, and the water temperature of described underwater cutpellet controls at 75 ~ 95 DEG C;
By the material water separator of propeller type, described air permeable polyolefin master batch is separated from water;
By the described air permeable polyolefin master batch through being separated by 2 ~ 7 road Cemented filling, described per pass pipeline is provided with independently blower fan;
Under the condition of Liao Wen≤60 of described air permeable polyolefin master batch DEG C, collect and pack, obtaining the described air permeable polyolefin master batch that Shui divides Han Liang≤300ppm.
As the improvement of such scheme, the length-to-diameter ratio of described tablets press is 35 ~ 50;
Wherein, the temperature distribution of described tablets press barrel is as follows: 170 ~ 180 DEG C, a district, two 190 ~ 195 DEG C, districts of 180 ~ 190 DEG C three, district, four 180 ~ 190 DEG C, districts, five 175 ~ 185 DEG C, districts, six 180 ~ 190 DEG C, districts, seven 190 ~ 200 DEG C, districts, die head 200 ~ 220 DEG C.
Wherein, the vacuum tightness in described tablets press barrel the 6th district is set to-0.2 MPa ~-0.01MPa.
As the improvement of such scheme, the described air permeable polyolefin master batch through being separated is being passed through 2 ~ 7 road Cemented filling, and described per pass pipeline is provided with in the step of independently blower fan:
Described pipeline is stainless steel pipes;
Described pipeline external parcel the foam material thermal insulation layer for keeping homo(io)thermism;
Long 2 ~ 10 meters of described per pass pipeline;
The end of described per pass pipeline is provided with the opening funnel for collection material.
As the improvement of such scheme, will put in parallel dual-screw tablets press through pretreated mixing raw material, and extrude before pelletizing obtains air permeable polyolefin master batch step, also comprise:
40 ~ 70% polyolefin resines, 0.01 ~ 2% processing aid and 0.01 ~ 2% oxidation inhibitor are joined in high speed mixer and be uniformly mixed 5 ~ 20 minutes, obtain mixture, the rotating speed of described high speed mixer is 800 ~ 1200 revs/min;
Join in homogenizer by 40 ~ 70% mineral fillers, continue to be uniformly mixed 10 ~ 25 minutes with described mixture, obtain through pretreated mixing raw material, the rotating speed of described high speed mixer is 800 ~ 1200 revs/min.
As the improvement of such scheme, described polyolefin resin is one in Low Density Polyethylene, high density polyethylene(HDPE), linear low density polyethylene, metallocene PE, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, homo-polypropylene or combination;
Described mineral filler is one in water-ground limestone, light calcium carbonate, barium sulfate, calcium sulfate, talcum powder, wollastonite, silicon-dioxide, calcium oxide or combination, and its grain size is 0. 3 microns ~ 12 microns;
Described processing aid is one in PE wax, E wax, calcium stearate, Zinic stearas, Magnesium Stearate, rare earth class lubricant or combination;
Described oxidation inhibitor is one or both the compound in Hinered phenols antioxidant and phosphite ester kind antioxidant.
As the improvement of such scheme, the Shui being the described air permeable polyolefin master batch that main raw material obtains by described polyolefin resin and mineral filler divides Han Liang≤200ppm;
The density of described Low Density Polyethylene is 0.910 ~ 0.935g/cm
3;
The density of described high density polyethylene(HDPE) is 0.940 ~ 0.980g/cm
3;
The density of described linear low density polyethylene is 0.910-0.940 g/cm
3;
The melting index of described metallocene PE is 1 ~ 6 g/10min;
The melting index of described ethylene-octene copolymer is 2 ~ 4 g/10min;
Vinyl acetate content in described ethylene-vinyl acetate copolymer is 5% ~ 40%.
Implement the present invention and there is following beneficial effect:
The present invention is about a kind of air permeable polyolefin master batch and preparation method thereof, in air permeable polyolefin master batch preparation field, compared with prior art, first without the need to through drying process, but by regulating the temperature of water coolant, control the surface temperature of particle, use the mode of multiple tracks airduct conveying, reach and remove air-permeable masterbatch moisture content, make its Shui divide Han Liang≤300ppm, You Xuan Wei≤200ppm, physical and chemical performance is good.The temperature that the present invention controls particle keeps constant, avoid temperature die-off rapid increasing mainly by: 1, controlling the water temperature of underwater cutpellet is 75 ~ 95 DEG C, thus ensures that the temperature of air permeable polyolefin master batch is not less than 75 DEG C; 2, adopt the conveying of multiple tracks airduct, pipeline external parcel the foam material thermal insulation layer for keeping homo(io)thermism, to keep material temperature can not rapid drawdown; 3, under the condition of material temperature 60 DEG C, collect and pack air permeable polyolefin master batch, to ensure that particle does not absorb moisture content in air and just packs, avoiding again heating and the energy consumption that increases.
Adopt the present invention, simplify the production process of air-permeable masterbatch, reduce energy consumption, obtained air-permeable masterbatch moisture content Han Liang≤300ppm, You Xuan Wei≤200ppm, compared with the moisture content Han Liang≤600ppm of prior art, the water content of air permeable polyolefin master batch of the present invention obviously reduces, and avoids excessive moisture content to affect outward appearance and the unfavorable condition such as physicals, pH value, even holes of the film obtained by air-permeable masterbatch.In addition, other indexs of the present invention are all improved, and such as melting index, tensile strength, fracture extension rate, flexural strength, modulus in flexure etc., can meet the requirement of follow-up masking, ensure the Quality and yield of product.In addition, the present invention also utilizes the dispersing uniformity of high filler loading capacity fine mineral filler (grain size is 0. 3 microns ~ 12 microns), improves its mechanical property and processing characteristics, meets follow-up requirement and the service requirements of preparing the process for processing of film.
Accompanying drawing explanation
Fig. 1 is the schema of the preparation method of a kind of air permeable polyolefin master batch of the present invention;
Fig. 2 is the another schema of the preparation method of a kind of air permeable polyolefin of the present invention master batch;
Fig. 3 is the schematic diagram of stainless steel transport pipe of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
Embodiments provide a kind of air permeable polyolefin master batch, it is as follows in the main raw material formula of weight proportion:
Polyolefin resin 40 ~ 70%;
Mineral filler 40 ~ 70%;
Preferably, air permeable polyolefin master batch is as follows in the main raw material formula of weight proportion:
Polyolefin resin 45 ~ 65%;
Mineral filler 45 ~ 65%.
The Shui being the described air permeable polyolefin master batch that main raw material obtains by described polyolefin resin and mineral filler divides Han Liang≤300ppm;
Preferably, the Shui being the described air permeable polyolefin master batch that main raw material obtains by described polyolefin resin and mineral filler divides Han Liang≤200ppm.
The water content of air permeable polyolefin master batch of the present invention obviously reduces, and avoids excessive moisture content to affect outward appearance and the unfavorable condition such as physicals, pH value, even holes of the film obtained by air-permeable masterbatch.In addition, other indexs of the present invention are all improved, and such as melting index, tensile strength, fracture extension rate, flexural strength, modulus in flexure etc., can meet the requirement of follow-up masking, ensure the Quality and yield of product.
Wherein, described polyolefin resin is one in Low Density Polyethylene, high density polyethylene(HDPE), linear low density polyethylene, metallocene PE, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, homo-polypropylene or combination;
Described mineral filler is one in water-ground limestone, light calcium carbonate, barium sulfate, calcium sulfate, talcum powder, wollastonite, silicon-dioxide, calcium oxide or combination.
The density of described Low Density Polyethylene is 0.910 ~ 0.935g/cm
3;
Preferably, the density of described Low Density Polyethylene is 0.915 ~ 0.920g/cm
3;
Further preferably, the density of described Low Density Polyethylene is 0.917g/cm
3.
The density of described high density polyethylene(HDPE) is 0.940 ~ 0.980g/cm
3;
Preferably, the density of described high density polyethylene(HDPE) is 0.948 ~ 0.960g/cm
3;
Further preferably, the density of described high density polyethylene(HDPE) is 0.950g/cm
3.
The density of described linear low density polyethylene is 0.910-0.940 g/cm
3;
Preferably, the density of described linear low density polyethylene is 0.915-0.930 g/cm
3;
Further preferably, the density of described linear low density polyethylene is 0.920g/cm
3.
The melting index of described metallocene PE is 1 ~ 6 g/10min;
Preferably, the melting index of described metallocene PE is 2 ~ 4 g/10min;
Further preferably, the melting index of described metallocene PE is 3 g/10min.
The melting index of described ethylene-octene copolymer is 2 ~ 4 g/10min;
Preferably, the melting index of described ethylene-octene copolymer is 2.8 ~ 3.8 g/10min;
Further preferably, the melting index of described ethylene-octene copolymer is 3.5 g/10min.
Vinyl acetate content in described ethylene-vinyl acetate copolymer is 5% ~ 40%;
Preferably, the vinyl acetate content in described ethylene-vinyl acetate copolymer is 20% ~ 40%;
Further preferably, the vinyl acetate content in described ethylene-vinyl acetate copolymer is 35%.
Described mineral filler is ultra-fine inorganic filler, and its grain size is 0. 3 microns ~ 12 microns;
Preferably, the grain size of described mineral filler is 0. 5 microns ~ 10 microns.
Embodiment 1
In high speed mixer, add 45% polyolefin resin (Low Density Polyethylene: linear low density polyethylene=1:5), 1% Zinic stearas and 1% Hinered phenols antioxidant (trade mark 1010) mixing 10 minutes, rotating speed is 1000 revs/min; Joined in homogenizer by 45% ultra-fine inorganic filler-calcium carbonate (particle diameter is for being of a size of 0. 5 microns ~ 10 microns) and be uniformly mixed 15 minutes together, rotating speed is 1000 revs/min; Then put in dual-screw pelletizer, the temperature of barrel: 180 °, a district C, two 185 °, district C, three 190 °, district C, four 180 °, district C, five 175 °, district C, six 185 °, district C, seven 190 °, district C, die head 210 ° of C, the vacuum tightness of venting port is-0.07 MPa, and circulating water temperature is set to 85 ° of C, underwater cutpellet; Water is separated with air-permeable masterbatch through the material water separator of propeller type by ventilative particle, through vibratory screening apparatus screening laggard enter first stainless steel transport pipe, then enter successively second and third, four, five road stainless steel transport pipes; Collect air-permeable masterbatch, pack with aluminium plastic bag, temperature during packaging is 65 ° of C.
Embodiment 2
In high speed mixer, add 50% polyolefin resin (Low Density Polyethylene: linear low density polyethylene=1:3), 0.5% Zinic stearas and 0.5% Hinered phenols antioxidant (trade mark 1010) mixing 10 minutes, rotating speed is 1000 revs/min; Joined in homogenizer by 52% ultra-fine inorganic filler-calcium carbonate (particle diameter is for being of a size of 0. 5 microns ~ 10 microns) and be uniformly mixed 15 minutes together, rotating speed is 1000 revs/min; Then put in dual-screw pelletizer, the temperature of barrel: 180 °, a district C, two 185 °, district C, three 190 °, district C, four 180 °, district C, five 175 °, district C, six 185 °, district C, seven 190 °, district C, die head 210 ° of C, the vacuum tightness of venting port is-0.0,6 MPa, circulating water temperature is set to 90 ° of C, underwater cutpellet; Water is separated with air-permeable masterbatch through the material water separator of propeller type by ventilative particle, through vibratory screening apparatus screening laggard enter first stainless steel transport pipe, then enter successively second and third, four, five road stainless steel transport pipes; Collect air-permeable masterbatch, pack with aluminium plastic bag, temperature during packaging is 70 ° of C.
Embodiment 3
In high speed mixer, add 60% polyolefin resin (Low Density Polyethylene: linear low density polyethylene: ethylene-octene copolymer=1:5:2), 0.8% Zinic stearas and 0.7% Hinered phenols antioxidant (trade mark 1010) mixing 10 minutes, rotating speed is 1000 revs/min; Joined in homogenizer by 48% ultra-fine inorganic filler-calcium carbonate (particle diameter is for being of a size of 0. 5 microns ~ 10 microns) and be uniformly mixed 15 minutes together, rotating speed is 1000 revs/min; Then put in dual-screw pelletizer, the temperature of barrel: 180 °, a district C, two 185 °, district C, three 190 °, district C, four 180 °, district C, five 175 °, district C, six 185 °, district C, seven 190 °, district C, die head 210 ° of C, the vacuum tightness of venting port is-0.08 MPa, and circulating water temperature is set to 95 ° of C, underwater cutpellet; Water is separated with air-permeable masterbatch through the material water separator of propeller type by ventilative particle, through vibratory screening apparatus screening laggard enter first stainless steel transport pipe, then enter successively second and third, four, five road stainless steel transport pipes; Collect air-permeable masterbatch, pack with aluminium plastic bag, temperature during packaging is 75 ° of C.
Embodiment 4
In high speed mixer, add 55% polyolefin resin (Low Density Polyethylene: high density polyethylene(HDPE): linear low density polyethylene: ethylene-octene copolymer=1:2:5:2), 0.:3 % Zinic stearas and 0.4% Hinered phenols antioxidant (trade mark 1010) mixing 10 minutes, rotating speed is 1000 revs/min; Joined in homogenizer by 55% ultra-fine inorganic filler-calcium carbonate (particle diameter is for being of a size of 0. 5 microns ~ 10 microns) and be uniformly mixed 15 minutes together, rotating speed is 1000 revs/min; Then put in dual-screw pelletizer, the temperature of barrel: 180 °, a district C, two 185 °, district C, three 190 °, district C, four 180 °, district C, five 175 °, district C, six 185 °, district C, seven 190 °, district C, die head 210 ° of C, the vacuum tightness of venting port is-0.1 MPa, and circulating water temperature is set to 90 ° of C, underwater cutpellet; Water is separated with air-permeable masterbatch through the material water separator of propeller type by ventilative particle, through vibratory screening apparatus screening laggard enter first stainless steel transport pipe, then enter successively second and third, four, five road stainless steel transport pipes; Collect air-permeable masterbatch, pack with aluminium plastic bag, temperature during packaging is 65 ° of C.
Reference example 1
In high speed mixer, add 45% polyolefin resin (Low Density Polyethylene: linear low density polyethylene=1:5), 1% Zinic stearas and 1% Hinered phenols antioxidant (trade mark 1010) mixing 10 minutes, rotating speed is 1000 revs/min; Joined in homogenizer by 45% ultra-fine inorganic filler-calcium carbonate (particle diameter is for being of a size of 0. 5 microns ~ 10 microns) and be uniformly mixed 15 minutes together, rotating speed is 1000 revs/min; Then put in dual-screw pelletizer; adopt the mode of water cooling bracing pelletizing; obtain air permeable polyolefin master batch just finished product; air-permeable masterbatch from dual-screw pelletizer temperature out more than 200 ° of C; water cooling bracing is cooled to the rear pelletizing of 30 ° of about C; be warming up to 90 ° of C with drying machine again and remove moisture content, obtain finished product.
Embodiment 1 to 4, and reference example 1, all adopt the testing method of GB12006.2 to carry out the test of water content to it, detected result is as shown in following table two:
In sum, implement the present invention and there is following beneficial effect:
The present invention is about a kind of air permeable polyolefin master batch and preparation method thereof, in air permeable polyolefin master batch preparation field, compared with prior art, first without the need to through drying process, but by regulating the temperature of water coolant, control the surface temperature of particle, use the mode of multiple tracks airduct conveying, reach and remove air-permeable masterbatch moisture content, make its Shui divide Han Liang≤300ppm, You Xuan Wei≤200ppm, physical and chemical performance is good.The temperature that the present invention controls particle mainly by: the water temperature 1, controlling underwater cutpellet is 75 ~ 95 DEG C, thus ensures that the temperature of air permeable polyolefin master batch is not less than 75 DEG C; 2, adopt the conveying of multiple tracks airduct, pipeline external parcel the foam material thermal insulation layer for keeping homo(io)thermism, to keep material temperature can not rapid drawdown; 3, under the condition of material temperature 60 DEG C, collect and pack air permeable polyolefin master batch, to ensure that particle does not absorb moisture content in air and just packs, avoiding again heating and the energy consumption that increases.
Adopt the present invention, simplify the production process of air-permeable masterbatch, reduce energy consumption, obtained air-permeable masterbatch moisture content Han Liang≤300ppm, You Xuan Wei≤200ppm, compared with the moisture content Han Liang≤600ppm of prior art, the water content of air permeable polyolefin master batch of the present invention obviously reduces, and avoids excessive moisture content to affect outward appearance and the unfavorable condition such as physicals, pH value, even holes of the film obtained by air-permeable masterbatch.In addition, other indexs of the present invention are all improved, and such as melting index, tensile strength, fracture extension rate, flexural strength, modulus in flexure etc., can meet the requirement of follow-up masking, ensure the Quality and yield of product.In addition, the present invention also utilizes the dispersing uniformity of high filler loading capacity fine mineral filler (grain size is 0. 3 microns ~ 12 microns), improves its mechanical property and processing characteristics, meets follow-up requirement and the service requirements of preparing the process for processing of film.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (4)
1. an air permeable polyolefin master batch, is characterized in that, it is as follows in the composition of raw materials of weight proportion:
Polyolefin resin 45 ~ 55%;
Mineral filler 45 ~ 55%;
The Shui being the described air permeable polyolefin master batch that raw material obtains by described polyolefin resin and mineral filler divides Han Liang≤300ppm;
Wherein, described polyolefin resin is one in Low Density Polyethylene, high density polyethylene(HDPE), linear low density polyethylene, metallocene PE, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, homo-polypropylene or combination;
Described mineral filler is one in water-ground limestone, light calcium carbonate, barium sulfate, calcium sulfate, talcum powder, wollastonite, silicon-dioxide, calcium oxide or combination;
Described air permeable polyolefin master batch is obtained by following preparation method, and described preparation method comprises the following steps:
To put in parallel dual-screw tablets press through pretreated mixing raw material, and extrude pelletizing and obtain air permeable polyolefin master batch, wherein, described tablets press adopts the mode of underwater cutpellet, and the water temperature of described underwater cutpellet controls at 75 ~ 95 DEG C;
Be separated from water by described air permeable polyolefin master batch by the material water separator of propeller type, the temperature that air permeable polyolefin master batch is separated from water controls at 75 ~ 95 DEG C;
By the described air permeable polyolefin master batch through being separated by 2 ~ 7 road Cemented filling, described per pass pipeline is provided with independently blower fan; Described pipeline is stainless steel pipes; Described pipeline external parcel the foam material thermal insulation layer for keeping homo(io)thermism; Long 2 ~ 10 meters of described per pass pipeline; The end of described per pass pipeline is provided with the opening funnel for collection material;
Under the condition of Liao Wen≤70 of described air permeable polyolefin master batch DEG C, collect and pack;
The density of described Low Density Polyethylene is 0.910 ~ 0.935g/cm
3;
The density of described high density polyethylene(HDPE) is 0.940 ~ 0.980g/cm
3;
The density of described linear low density polyethylene is 0.910-0.940 g/cm
3;
The melting index of described metallocene PE is 1 ~ 6 g/10min;
The melting index of described ethylene-octene copolymer is 2 ~ 4 g/10min;
Vinyl acetate content in described ethylene-vinyl acetate copolymer is 5% ~ 40%;
Described mineral filler is ultra-fine inorganic filler, and its grain size is 0. 3 microns ~ 12 microns.
2. air permeable polyolefin master batch as claimed in claim 1, it is characterized in that, the Shui being the described air permeable polyolefin master batch that raw material obtains by described polyolefin resin and mineral filler divides Han Liang≤200ppm.
3. a preparation method for air permeable polyolefin master batch, is characterized in that, described preparation method comprises the following steps:
To put in parallel dual-screw tablets press through pretreated mixing raw material, and extrude pelletizing and obtain air permeable polyolefin master batch, wherein, described tablets press adopts the mode of underwater cutpellet, and the water temperature of described underwater cutpellet controls at 75 ~ 95 DEG C;
Be separated from water by described air permeable polyolefin master batch by the material water separator of propeller type, the temperature that air permeable polyolefin master batch is separated from water controls at 75 ~ 95 DEG C;
By the described air permeable polyolefin master batch through being separated by 2 ~ 7 road Cemented filling, described per pass pipeline is provided with independently blower fan;
Under the condition of Liao Wen≤70 of described air permeable polyolefin master batch DEG C, collect and pack, obtaining the described air permeable polyolefin master batch that Shui divides Han Liang≤300ppm;
Wherein, described air permeable polyolefin master batch is as follows in the composition of raw materials of weight proportion:
Polyolefin resin 45 ~ 55%;
Mineral filler 45 ~ 55%;
Described polyolefin resin is one in Low Density Polyethylene, high density polyethylene(HDPE), linear low density polyethylene, metallocene PE, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, homo-polypropylene or combination;
Described mineral filler is one in water-ground limestone, light calcium carbonate, barium sulfate, calcium sulfate, talcum powder, wollastonite, silicon-dioxide, calcium oxide or combination;
The density of described Low Density Polyethylene is 0.910 ~ 0.935g/cm
3;
The density of described high density polyethylene(HDPE) is 0.940 ~ 0.980g/cm
3;
The density of described linear low density polyethylene is 0.910-0.940 g/cm
3;
The melting index of described metallocene PE is 1 ~ 6 g/10min;
The melting index of described ethylene-octene copolymer is 2 ~ 4 g/10min;
Vinyl acetate content in described ethylene-vinyl acetate copolymer is 5% ~ 40%;
Described mineral filler is ultra-fine inorganic filler, and its grain size is 0. 3 microns ~ 12 microns;
The length-to-diameter ratio of described tablets press is 35 ~ 50;
Wherein, the temperature distribution of described tablets press barrel is as follows: 170 ~ 180 DEG C, a district, two 190 ~ 195 DEG C, districts of 180 ~ 190 DEG C three, district, four 180 ~ 190 DEG C, districts, five 175 ~ 185 DEG C, districts, six 180 ~ 190 DEG C, districts, seven 190 ~ 200 DEG C, districts, die head 200 ~ 220 DEG C;
Wherein, the vacuum tightness in described tablets press barrel the 6th district is set to-0.2 MPa ~-0.01Mpa;
Described pipeline is stainless steel pipes;
Described pipeline external parcel the foam material thermal insulation layer for keeping homo(io)thermism;
Long 2 ~ 10 meters of described per pass pipeline;
The end of described per pass pipeline is provided with the opening funnel for collection material.
4. the preparation method of air permeable polyolefin master batch as claimed in claim 3, it is characterized in that, the Shui being the described air permeable polyolefin master batch that raw material obtains by described polyolefin resin and mineral filler divides Han Liang≤200ppm.
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