Summary of the invention
The objective of the invention is to develop a kind of behind extrusion calendaring or blowing or casting film-forming,, make film become netted microvoid structure, make its pellet that becomes the antibacterial, ventilating, waterproof function film and preparation method thereof by two-way stretch.
According to above-mentioned purpose, technical characterictic of the present invention is:
The antibacterial, ventilating, waterproof plastic granular materials that a kind of film is used is characterized in that it is is matrix by polyolefin resin, adds inorganic powder, antiseptic-germicide, and elastomer resin, lubricant, oxidation inhibitor forms through the heating plasticizing granulation of kneading.
Wherein in the composition of pellet:
Described matrix resin mainly is LLDPE and LDPE, and LDPE can improve film toughness, can improve the inorganic powder addition; LDPE adds the intensity that helps improving film;
Described elastomer resin mainly is a methyl vinyl silicone rubber, also can isoprene-isobutylene rubber and other plastics elastic body;
Described antibacterial matrices mainly is a zeolite nanometer silver antimicrobial master batch, also can be silica nanometer silver or zirconium phosphate nano silver antibacterial matrices;
Described lubricant mainly is a stearic acid, also can be the inferior or stearic soap class of ethylene stearic bicine diester;
Described inorganic powder mainly is a water-ground limestone, also can be high Cen soil magnesium oxide, white inorganic powder such as barium sulfate; Described oxidation inhibitor is that Switzerland's vapour crust---the complex type antioxidant that good base produces, its trade mark is B900, or other close trade mark oxidation inhibitor.
The composition of pellet (weight ratio):
Linear low density polyethylene LLDPE 25-34
Low density polyethylene 2-5
Elastomer resin 8-9
Lubricant 4-5
Antibacterial matrices (content 25%) 2-6
Inorganic powder (water-ground limestone≤2000 orders) 50-55
Oxidation inhibitor a little
According to above-mentioned purpose, its preparation method is:
The first step is produced mother particles of antibacterial plastics.
The inorganic powder of second step preparation polymolecularity.
The antibacterial, ventilating, waterproof plastic granular materials that the 3rd preparation film is used.
Plastic granule disclosed in this invention can be used for processing system film, has good waterproof and breathable performance, and antibiotic waterproof and breathable pellet has excellent waterproofness, ventilation property after film is made in two-way stretch.
Embodiment
One. the preparation of mother particles of antibacterial plastics
The purpose of preparation mother particles of antibacterial plastics is
1) reduces the nanometer silver inorganic antiseptic and can be accelerated the oxidation blackening being higher than 100 ℃.(because generating silver suboxide)
2) a spot of nanometer silver can better be dispersed among the plastic granule.
The composition of mother particles of antibacterial plastics (weight ratio):
Linear low density polyethylene LLDPE 50-65
Low density polyethylene 10-18
Antiseptic-germicide 20-20
Polyethylene wax 2.5-3.5
Zinic stearas 0.8-1.2
Titanium dioxide 1.6-2.4
Consider antibacterial matrices convenient calculating when reinforced, we adopt antiseptic-germicide content usually is 25% antibacterial matrices prescription.
Mother particles of antibacterial plastics production is exemplified below:
Take by weighing 15 kilograms of 55 kilograms of linear low density polyethylene LLDPE and low density polyethylenes earlier, 25 kilograms of nanometer silver inorganic antiseptics, 2.5 kilograms of polyethylene waxs, 1.5 kilograms of titanium dioxides, 1 kilogram of Zinic stearas, join in the high-speed kneading machine and mix and stir, mix and stir temperature and be no more than 80 ℃, churning time is no less than 20 minutes, by stirring, because the polyethylene wax fusing point is lower, under 70-80, Zinic stearas and polyethylene wax just can fully coat nanometer silver, reduce nanometer silver oxidized variable color during granulation afterwards.Granulation is to carry out in the exhaust dual-screw pelletizer; the screw zones temperature is during granulation; the charging opening temperature is 65-80 ℃; middle fluxing zone is 100-110 ℃, and head temperature is 110-115 ℃, and die temperature is 120-130 ℃; extrude billot; through the fly cutter pelletizing, fall into tank, send the boiling oven drying to remove moisture again and promptly get and contain antiseptic-germicide 25% mother particles of antibacterial plastics.
Nanometer silver inorganic antiseptic of the present invention is a zeolite nanometer silver inorganic antiseptic, and its trade mark is RH A-2, also can adopt zirconium phosphate nano silver inorganic antiseptic, or nano titania silver inorganic antiseptic.
The antibiotic mechanism of nanometer silver can be thought:
Under the condition of humidity, antibacterial matrices slowly discharges the small amount of silver ion.Because bacterium surface has negative charge, therefore the silver ions that has positive charge is attracted to bacterium surface, react with group on the microbe internal protein and then destroy its electrolyte balance, cause bacterium because cell walls is impaired and dead, i.e. oligodynamic effect.
This reaction makes protein coagulating, the activity of destroy microorganisms synthetic enzyme, and may disturb the synthetic of microbial DNA, cause microorganism forfeiture division growth ability and death.Metal ion and combination of proteins have also been destroyed electric transmission system, respiratory system and the substance delivery system of microorganism simultaneously.Because metal ion generally loads on the slow-releasing carrier, the metal ion that in use has anti-microbial property discharges gradually, and antibacterial metal ions just has antibacterial effect under lower concentration, and therefore by the release of antibacterial metal ions, inorganic antiseptic can be brought into play persistent antibacterial effect.
Silver-ion antibiotic performance: Ag
3+>Ag
2+>Ag
+
Valence state silver ion reduction gesture is high, can make surrounding space generation atomic oxygen and greatly improve antibacterial effect.
Two. the preparation of polymolecularity inorganic powder
The fineness of inorganic powder and dispersed quality, it is important so far with what to form the micropore size during to the pellet film forming.
The inorganic powder that the present invention selects for use mainly is a water-ground limestone, also can be high Cen soil, magnesium oxide, white inorganic powder such as barium sulfate.
Earlier water-ground limestone is crushed to the 200-300 order during preparation, adds compound dispersion agent then.Dispersion agent produces the trade mark 9400 by Rome Haars Co., Ltd, stearic acid and the butyl (tetra) titanate coupling agent is composite forms, their ratio of mixture respectively are about 1/3rd, addition is 2-4%, in high-speed kneading machine, stirred at normal temperatures 15-20 minute during interpolation, the stream pulverizer of supplying gas then is crushed to 2000 or less than 2000 orders, its low volatile is less than 350ppm.
Treated lime carbonate has very high dispersiveness, adds the existence of metatitanic acid fourth fat coupling agent, and an end of metatitanic acid fourth fat and the hydrogen bond of plastics are crosslinked, and the other end long chain molecule twines inorganic powder, has improved the bonding force that matrix resin and inorganic powder are practised physiognomy greatly.
Add a large amount of calcium carbonate superfine powder powders, when being the pellet film forming, can become air permeable waterproof function prerequisite.Because the pellet film forming is during by two-way stretch, plastics are ductile, and inorganic particles does not have ductility, just passively plastic molecules move because the two speed is inconsistent when mobile, netted microvoid structure just appears on every side in particulate.The micropore that is evenly distributed in a large number can see through most gases, comprises the steam of evaporation of perspiration, but it can intercept water and other small droplets again, thereby makes the film that is processed into have the air permeable waterproof function.
Three. the preparation of antibacterial, ventilating, waterproof plastic granular materials for membrane:
Antibacterial, ventilating, waterproof plastic granular materials for membrane is represented wherein with the SC-GKL-OO antibacterial, ventilating, waterproof plastic granular materials for membrane in enterprise, and SC-GKL-OO is the name of enterprise to this product.
It is to be the basis by polyolefin resin for a plastic granule of the present invention, adds inorganic powder, antiseptic-germicide, elastic resin, lubricant, a kind of antibacterial, ventilating, waterproof plastic granular materials for membrane that oxidation inhibitor forms through the heating plasticizing of kneading.
The composition of plastic granule: (weight ratio)
Linear low density polyethylene LLDPE 25-34
Low density polyethylene 2-5
Elastomer resin 8-9
Lubricant 4-5
Antibacterial matrices (content 25%) 2-6
Inorganic powder (water-ground limestone≤2000 month) 50-55
Oxidation inhibitor a little
Matrix resin of the present invention selects for use LLDPE because of its good toughness, can improve the inorganic powder addition, adds LDPE in right amount, and favourable raising film strength occurs breaking when reducing the film two-way stretch.
Elastomer resin of the present invention mainly is methyl vinyl silicone rubber (an ethylene methacrylic radical siloxane), also can isoprene-isobutylene rubber and or other plastics elastic body.Its adding can overcome owing to add the deficiency of a large amount of inorganic powder rear film strength degradation.
Antibacterial matrices of the present invention mainly is that the antibacterial matrices that contains the zeolite nanometer silver is addressed in the front, also can adopt nano titania silver or zirconium phosphate nano silver antibacterial matrices.
Lubricant of the present invention mainly is a stearic acid, also can be stearic soap classes such as ethylene bis stearamide or Zinic stearas.
Inorganic powder of the present invention mainly is the polymolecularity water-ground limestone, also can be high Cen soil, magnesium oxide, white inorganic powder such as barium sulfate.Give an example above its preparation method.Its fineness is equal to or less than 2000 orders, and it contains low volatile less than 350ppm.
Described oxidation inhibitor is Switzerland vapour crust---its trade mark of complex type antioxidant that good base produces is B900, also can be with other close trade mark oxidation inhibitor.
Film is with the implementation example of antibiotic waterproof and breathable pellet:
The compositing formula of pellet is (weight ratio) for example
The implementing process process
Take by weighing LLDPE and LDPE uniform mixing in the spice machine earlier, add calcium carbonate powder then successively, methyl vinyl silicone rubber, stearic acid, antibacterial matrices and a little oxidation inhibitor, mixing temperature is no more than 80 ℃ in high-speed kneading machine, and the spice time is not less than 20 minutes.
Second step; mixture is joined granulation in the granulation of exhaust dual-screw pelletizer; during granulation, the feeding section temperature is that the fluxing zone temperature is controlled at 100-110 ℃ in the middle of 65-90 ℃, and the head temperature temperature is controlled at and is 110-115 ℃; die temperature is 120-130 ℃; screw speed is controlled at about 250 rev/mins, and for reducing impurity particle influence membrane technology later on, head should adopt four metafiltration nets; each layer mesh is " 80+120+120+80 ", inferior and often replacing.Must keep mouthful mould material hole clean during granulation, to guarantee the billot even thickness.Head fly cutter pelletizing, the tank cooling, fluidized drying is removed moisture.
The antibacterial, ventilating, waterproof film forming is with reference to technology:
System is during film: adopt two-way stretch after the first film forming, adopt special wrap-up again, cause the cross directional stretch of film by the folder film.Its key is not produce the continuity that interrupts membrane structure under the situation in hole
Extrude processing conditions:
1) casting films
1. melt temperature: 177-232 ℃
2. die temperature: 177-232 ℃
3. embossing axis temperature: 21-54 ℃
4. thickness before stretching: 102-152 μ m
2) blown film
1. die gap is avoided melt fracture
2. melt temperature: 190-240 ℃
3. blow-up ratio: 2: 1 to 4: 1
Drawing process:
Two-way stretch increases the toughness of film, and technical requirements is higher, and stretch ratio is 1: 4.Because high extensibility, film toughness is poor; Low extensibility, bad hydraulic permeability.After making film, draft temperature: 60-105 ℃ of antibiotic waterproof and breathable granule product have premium properties.
Antibiotic waterproof and breathable pellet has excellent waterproofness, ventilation property after film is made in two-way stretch, the water-proof air-moisture-permeable index reaches 1700-4500g/m
224hr had both made under the glue fit-state also can reach 3500g/m
224hr is higher than 2000g/m
2The international standard of 24hr.Can effectively intercept little water droplet, 9,000,000,000 apertures are arranged per square inch, and each aperture have only 20,000 of water droplet/, each aperture can hold 700 water moleculess to be passed through, so sweat gas on one's body can pass through thin film evaporation easily.
The antibiotic waterproof and breathable pellet of table 1 is made film Main physical performance perameter
Antibiotic waterproof and breathable pellet is germ resistance efficiently:
Concrete antibacterial effect exemplifies as follows:
Table 2 uses antibiotic waterproof and breathable master batch system LLDPE film (1) (2)
Sample | The bacterium number | | |
|
Initial |
After 18 hours |
Logarithmic value |
|
The LLDPE resin adds the 0.2%SC-GKL-00 masterbatch |
1×10
5 |
<1× 10
2 |
<2.0 |
>3.7 |
Check sample |
1×10
5 |
5×10
5 |
5.7 |
---- |
Table 23 uses the antibiotic waterproof of SC-GKL-00 to lure gas master batch system M-LLD film
(1) (2) Sample | The bacterium number | Logarithmic value | Logarithmic value (check sample)-logarithmic value (M-LLD) |
Initial | After 18 hours |
The M-LLD resin adds the 0.2%SC-GKL-00 masterbatch | 1×10
5 | <1× 10
2 | <2.0 | >4.8 |
Check sample | 1×10
5 | 6×10
5 | 6.8 | ---- |
Annotate (1): detect and use bacterium: intestinal bacteria (Escherichia coli IFO 3972)
Annotate (2): detection method: Japanese national industrial standards JIS Z 2801
This film belongs to degradation material, and is free from environmental pollution with the back:
The antibacterial, ventilating, waterproof film of making can be widely used in paper nappy, paper diaper, the liquid absorbing net face of sanitary napkin, disposable medical gloves, mouth mask, food product pack and the health medical material that baby and grownup use.