CN1114785A - Melting spray lamination differentiated battery separator diaphragm - Google Patents

Abstract

The present invention relates to a melt-sprayed lamination differentiated battery separator diaphragm and its production method. It includes at least two layers of fibre layers whose fibre diameters are different. The fibre layer whose average fibre diameter is thicker is used for increasing elasticity, rigidity and hardness of the separator diaphragm, while the fibre layer whose average fibre diameter is finer is used for controlling indexes of all items of the separator diaphragm. On the basis of known melt-spraying process said invention regulates the technological parameters and reciprocating motion of receiving device, and uses several spinning-nozzles, which jet fibres of different diameter to directly form the invented lamination differentiated separator diaphragm.

Description

A kind of melting spray lamination differentiated battery separator diaphragm

The present invention relates to a kind of melting spray lamination differentiated battery separator diaphragm and production method thereof, it comprises the fibrage in two-layer at least different silks footpath, the thicker fibrage in wherein average silk footpath is used to increase elasticity, rigidity, the hardness of dividing plate, the thinner fibrage in average silk footpath, be used to control every index of dividing plate, belong to melt-blown non-woven baffle plate of lead acid storage battery technical field.

In the prior art, the employed dividing plate of lead acid accumulator mostly is board-like (or claiming chip), and the pocket type dividing plate is also arranged.Press the manufacturing raw material difference of dividing plate, dividing plate can be divided into following a few class: 1. plastic septum.Mainly be PVC raw material or PE raw material, because the processing of domestic plastic septum

The stable inadequately self reason that reaches plastic septum of quality makes the aperture of plastic septum bigger, material

More crisp, PVC chip dividing plate especially, produce, easily ruin in the processing, transportation the angle,

Fracture, easily aging in the use, life-span weak point now begin progressively to be replaced by other dividing plate.2. rubber separator.Its raw material are taken from natural rubber, so raw material resources are in short supply.Again because its making

Complex process is made approach difficult every pulling, and it is less to make that rubber separator exists the aperture,

But problems such as low, the interior resistance of porosity is big.3. glass fibre separator.Because of glass dividing plate raw material-glass fibre is too crisp, frangibility, antidetonation energy

The power extreme difference influences result of use, and it easily produces environment and operator in production and processing in addition

Harm.4. nonwoven dividing plate.This dividing plate adopt meltblown with the polypropylene GRANULES material through the screw extruder melt extruded

The spray silk forms, because of it is the fleece shelf structure, so the aperture is little, porosity is high, internal resistance is low,

And the dividing plate good toughness, antivibration wear resistant, but other diaphragm stiffness is not enough (especially slim relatively

Dividing plate).

For addressing the above problem, the existing dividing plate that has occurred the reinforcement type again is to improve its electrical property and rigidity; For the protection plate, prevent that lead powder from coming off and antidetonation, the pocket type dividing plate has appearred again.But drawn new problem thus again, poor as the fold resistance of muscle, the firmness of muscle and substrate is relatively poor, and the edge sealing of pocket type dividing plate is insecure etc.

Chinese patent 90219916.1 discloses a kind of storage battery pocket type dividing plate, after it is the rectangle adhesive-bonded fabric doubling that acrylic resin is made, and the pocket type structure that the both sides hot-press sealed forms.Though the patented product has reduced accumulator internal resistance, improved accumulator voltage, the ion-exchange diffusion is fast, and its quality is softer, rigidity not enough, edge sealing is not firm, is difficult to adapt to high speed, large-scale production.And be to improve the dividing plate rigidity to increase its thickness, equal to have strengthened cost again.

United States Patent (USP) 3947,537 disclose a kind of production method of battery separator, can obtain the surface with this process and be forced out the convex tendon dividing plate of (or claiming fin), and its technological process of production is long, and the process of beading is the secondary operations to dividing plate, can damage structure and cause the index of original dividing plate to change.

United States Patent (USP) 5,089,360 disclose and a kind ofly with meltblown N-methyl or N-alkoxy methyl nylon resin have been made the production method of high strength nonwoven battery separator, and its raw material is beforehand with hydrophilic treated, to adapt to the requirement of dividing plate.But still do not occur by the adjusting process parameter, and obtain on same dividing plate, having the different fibrolaminar lamination dividing plate in two-layer average silk footpath, to improve its intensity.

Purpose of the present invention will provide a kind of melting spray lamination differentiated battery separator diaphragm and production method thereof exactly, promptly use known melt-blown process technology, obtain the different lamination differentiated dividing plate in two-layer at least fiber average silk footpath by short-cut methods such as adjusting process parameters, make this product both have the characteristics in porous, low aperture, low internal resistance, filament footpath, suitable rigidity, elasticity and toughness are arranged again.

The object of the present invention is achieved like this: a kind of melting spray lamination differentiated dividing plate, and it comprises the melt-blown non-woven fibrage that one deck average fiber silk footpath is thin at least, average pore size is less, quality is softer, basic weight is more equal, with every index of control dividing plate; Comprise that also one deck average fiber silk footpath is thick at least, average pore size is big, quality is hard, the more equal melt-blown non-woven fibrage of basic weight,, and become one by autoadhesion between the above-mentioned fibrage with rigidity, elasticity and the hardness of raising dividing plate.Wherein, the fibrage that described fibre diameter is thinner, its footpath mean value be generally at 3 μ m～10 mu m ranges, and aperture mean value is generally below 40 μ m, and thickness is generally 0.2～0.5mm (account for product gross thickness 40%); The fibrage that described fibre diameter is thicker, its footpath mean value be generally at 15～25 μ m, and aperture mean value is generally more than 40 μ m, and thickness is generally 0.4～1.0mm (account for product gross thickness 60%).And described high polymer particulate material is an isotactic polypropylene.

The production method of the melting spray lamination differentiated dividing plate of a kind of special production, this method adopts known melt-blown process that polypropylene GRANULES material melt extruded spray silk is become net, and on average fibrage that the footpath is thinner or thicker of the fiber of one deck at least that has been sprayed into, by the adjusting process parameter, allow the receiving equipment reciprocating motion, directly melting and spraying at least again, the average silk of one deck fiber footpath is different from original fibrolaminar fibrage; Or, control its melt ejection silk footpath respectively and obtain the said goods by a plurality of or organize shaper for jet spinning more.

The present invention because of will be at least the thicker fibrage stack in the thinner fibrage in the average silk of one deck fiber footpath and the average silk of one deck fiber footpath at least form differential dividing plate, wherein be used for controlling every precision of dividing plate, as aperture, porosity etc. than the fibrage in filament footpath; Be used for improving the rigidity of dividing plate than the fibrage in crin footpath, so both increased the elasticity of dividing plate, kept soft dividing plate performance, improved hardness, the rigidity of dividing plate again, soft dividing plate is become the hard dividing plate; The fibrage stack in thick because of adopting, thin again different silks footpath, make dividing plate have porous, low aperture, low, the thin characteristic in footpath of internal resistance, and increased the savings ability of electrolyte than the fibrage in crin footpath, strengthen the hydrophily of dividing plate, cushioned, alleviated the deformation of plate when discharging and recharging.Also increase dividing plate elasticity, alleviated the top ripple vibrations of pole plate in using, more helped the protection of pole plate.Also increase the hardness of dividing plate, be convenient to the production assembling of storage battery and mass, large-scale production; The fibrage stack thick because of adopting again, that the filament footpath is different forms dividing plate, therefore with soft (being single-wide silk footpath) dividing plate ratio of same thickness, save raw material, shortened process time, reduced production cost, improved product yield, also avoided the lamination of original dividing plate simultaneously; Because of adopting meltblown to obtain the different lamination dividing plate in filament footpath by one group, reciprocating motion, the adjusting process parameter of organizing shower nozzle or receiving system, need not change existing equipment can realize more again.Moreover the different fibrage in filament footpath is that fiber by the semi-molten state overlaps at random, the condensation autoadhesion together, need not the secondary bonding of other chemistry, machinery, time processing moulding, thereby technology is simple, easy to operate, realize easily.

Describe technical characterictic of the present invention in detail below in conjunction with embodiment and accompanying drawing.Accompanying drawing 1, the thicker thinner fibrage accompanying drawing 2 in fibrage 2. average silk footpaths in 1. average silk footpaths among the cutaway view figure of melting spray lamination differentiated dividing plate, the production schematic diagram embodiment one of the melting spray lamination differentiated dividing plate of a plurality of shaper for jet spinning moulding: by accompanying drawing 1, as can be seen, melting spray lamination differentiated dividing plate comprises fibrage (2) that the footpath of one deck average fiber silk at least is thinner and the directly thicker fibrage (1) of the average silk of one deck at least, wherein, the average silk of the fiber of fibrage (1) footpath is 15 μ m～25 μ m, is 20 μ m herein; Average pore size is more than the 40 μ m, is 60 μ m herein, and porosity reaches more than 70%, is 72% herein, and thicker like this silk footpath, bigger aperture, higher porosity make electrolyte be stored, and have reduced internal resistance.And thicker silk footpath, dividing plate hardness, rigidity are improved greatly, be convenient to the assembling of dividing plate.Than the fibrage springiness in crin footpath, the deformation when the available buffer positive plate discharges and recharges, and the vibrations that slow down pole plate.The average silk of the fiber of fibrage (2) footpath is 3 μ m～10 μ m, gets 5 μ m herein, below the 40 μ m of aperture, get 30 μ m herein, porosity gets 72% herein more than 70%, thickness is generally 0.2 μ m～0.5 μ m, gets 0.32mm herein, so the performance of dividing plate, precision are guaranteed.In addition, the dividing plate gross thickness is 0.8mm, and be 0.48mm than the thickness of the fibrage (1) in crin footpath, guaranteeing under the constant prerequisite of an index such as clapboard aperture, porosity, rigidity, hardness, with the battery separator ratio in same thickness, single-wide silk footpath, alleviated the weight of dividing plate relatively, reduced consumption of raw materials, shorten process time, improved output.Embodiment two: use single shower nozzle, the method that reciprocal receiving system is produced melting spray lamination differentiated battery separator diaphragm, when choosing the melt polypropylene temperature, pressure, temperature, during air pressure, at first the PP particulate material is injected the extruder hopper, through the screw extruder fusion, be squeezed to spray silk former, spray silk again, become net on receiving system, along with moving back and forth of receiving system, when reaching 0.3mm than the fibrage production in filament footpath is thick, adjust air pressure, make filament footpath chap, and directly continue on the basis of fibrillation layer, to produce than crin fibrage directly, till reaching production specification.Embodiment three: with the method for many shower nozzles one-shot forming melting spray lamination differentiated battery separator diaphragm, when the polypropylene GRANULES material injects hopper (1), through the crowded shaper for jet spinning (3) of delivering to of screw extruder (2) fusion, extrude by the material of regulating each extruder (2), and outlet air temperature, the air pressure of each shaper for jet spinning (3), just can receive the lamination differentiated battery separator diaphragm (5) that conveyer belt (4) upward obtains continuous different silks footpaths, differing texture, different-thickness, hardness.Wherein the extrusion capacity of extruder 2a, 2b, 2c is respectively: 2.46kg/h, 2.46kg/h, 7.37kg/h; The silk footpath that shaper for jet spinning 3a, 3b, 3c are sprayed is respectively: 3 μ m, and 5 μ m, 20 μ m, like this, resulting product is: silk footpath 3 μ m～5 μ m, the fibrage of thick 0.3mm and silk footpath 20 μ m, the fibrolaminar stack dividing plate of thick 0.6mm.

Claims (4)

1. melting spray lamination differentiated battery separator diaphragm, it is to adopt melt-blown process that high polymer particulate material melt extruded, spray silk are become net and the flaky material produced, it is characterized in that: it comprises the melt-blown non-woven fibrage that one deck average fiber silk footpath is thin at least, average pore size is less, quality is softer, basic weight is more equal, with every index of control dividing plate; Comprise that also one deck average fiber silk footpath is thick at least, average pore size is big, quality is hard, the more equal melt-blown non-woven fibrage of basic weight,, and become one by autoadhesion between the above-mentioned fibrage with rigidity, elasticity and the hardness of raising dividing plate.

2. according to the described battery separator of claim 1., it is characterized in that: the fibrage that described fibre diameter is thinner, its footpath mean value is generally at 3 μ m～10 mu m ranges, and aperture mean value is generally below 40 μ m, and thickness is generally 0.2～0.5mm (account for product gross thickness 40%); The fibrage that described fibre diameter is thicker, its footpath mean value be generally at 15～25 μ m, and aperture mean value is generally more than 40 μ m, and thickness is generally 0.4～1.0mm (account for product gross thickness 60%).

3. according to the described battery separator of claim 1., its spy just is: described high polymer particulate material is that isotactic polypropylene and other are suitable for the high polymer of melt-blown process.

4. the production method of the described battery separator of special production claim 1., it adopts known melt-blown process that polypropylene GRANULES material melt extruded spray silk is become net, it is characterized in that: on average fibrage that the footpath is thinner or thicker of the fiber of one deck at least that has been sprayed into, by the adjusting process parameter, allow the receiving equipment reciprocating motion, directly melting and spraying at least again, the average silk of one deck fiber footpath is different from original fibrolaminar fibrage; By one, one group or a plurality of, organize shaper for jet spinning more, control its melt ejection silk footpath and melt spray volume respectively and obtain the said goods.

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