A kind of synchronous circulating type helixseal belting for electrostatic spinning
Technical field
The present invention relates to a kind of synchronous circulating type helixseal belting in electrostatic spinning field, namely a kind of can closing material fluid bath 700 when being synchronized with the movement with screw electrode is related to, effectively can suppress the solvent evaporates in material fluid bath, solvent evaporates can be avoided to cause the change of spinning fluid viscosity and the fiber quality decline caused thus or spinning process to stop; This synchronous circulating type helixseal belting is specially adapted to that the higher spinning solution system of volatility is a large amount of, the preparation of the nanofiber of serialization.
Technical background
Electrostatic spinning technique is a kind of technology utilizing electrostatic field force to produce nano-fiber material, at home and abroad obtains in recent years and studies widely.Its main technique principle is: under high voltage electrostatic field, and the pendency droplet top under electrostatic force being in capillary exit sends fine jet, and jet is in receiving system flight course, and solvent evaporates, is solidified into fiber.Electrostatic spinning technique is divided into needle-based and the large class of needleless hair style two.Relatively and needle-based Static Spinning, it is high, easy to operate that needleless hair style Static Spinning has output, there is not syringe needle blockage problem, spinneret easy to clean, the features such as manufacturing cost is lower.The representative of needle-less electrostatic spinning technique main at present, one is Elmarco company of Czech (roll-type) needle-less electrostatic spinning technique, its adopt the different surface morphology such as light face or surface band screw thread, decorative pattern transfer roller (see: WO2005/024101A1) as electrostatic spinning head, it is thicker that its machining obtains nanofiber, and uneven fineness is larger: when carrying out solution Static Spinning, average diameter is in 50 ~ 500nm scope; Two is screw electrode needle-less electrostatic spinning techniques, its adopt taenidium or flight as electrostatic spinning nozzle (see: CN 202107802 U), the output of fiber is more taller than the spinning nozzle of roll-type, is more suitable for industrialization and produces.But be no matter the electrostatic spinning mode of " roll-type " or " screw electrode ", its material fluid bath is all unlimited in the process of spinning, and lack effective means material fluid bath is sealed, this the quick and a large amount of volatilization of solvent in spinning process that will cause in material fluid bath, the volatilization of solvent makes the concentration of feed liquid increase gradually, viscosity also increases thereupon, the stability of spinning and fiber quality will be affected greatly, what even cause spinning process is forced to interruption, seriously hinders the commercial application process of equipment.
The core component of " spiral " electrospinning device is screw electrode, a part for the helical blade of screw electrode is immersed in the feed liquid in material fluid bath, in spinning process, screw electrode rotates, the blade of spiral takes feed liquid out of material fluid bath continuously, feed liquid spinning fibroblast under the effect of high voltage electric field of helical blade surface.For this kind equipment, because screw electrode rotates, and must ensure that the helical blade of spinning portion is unlimited, still lack effective means at present and while screw electrode rotary spinning, the solvent evaporates of the feed liquid in material fluid bath is effectively suppressed.
Summary of the invention
The object of the invention is: for the problem of the solvent evaporates of existing open type " spiral " electrospinning device, and a kind of synchronous circulating type helixseal belting for electrostatic spinning is provided, it can suppress significantly the solvent evaporates of feed liquid in material fluid bath while guarantee screw electrode rotary spinning, it is a kind of innovative sealing device, it is mainly by making annular sealing strip keep size direction consistent with the linear velocity of rotating screw electrode, realize material fluid bath sealing to a great extent with a kind of dynamical fashion be synchronized with the movement, the area that volatilizees can be reduced in spinning process, the quick volatilization of effective suppression material fluid bath internal solvent, be conducive to the concentration of spinning liquid and the long-time stable of viscosity, long-time for " spiral " electrospinning device, serialization operation and commercial application provide guarantee.
Technical scheme of the present invention is as follows:
Synchronous circulating type helixseal belting for electrostatic spinning provided by the invention is used for sealing the material fluid bath of spiral electrospinning device, its Main Function suppresses the quick volatilization of material fluid bath internal solvent while being the normal spinning of screw electrode 600 ensureing to rotate, it is a kind of circular form helixseal belting that can be synchronized with the movement with screw electrode, effectively can suppress the quick volatilization of material fluid bath internal solvent by reducing volatilization area.
A kind of synchronous circulating type helixseal belting for electrostatic spinning of the present invention, it is made up of annular sealing strip 100, line slideway 200, drive system 300, isochronous controller 400 and support pallet 500;
Described annular sealing strip 100 is the endless belt of even width, annularly the cross central line of band is dispersed with the screwed hole 130 of spacing and consistent size, the spacing of adjacent two screwed holes is consistent with the pitch of the screw electrode 600 in the material fluid bath 700 in spiral electrospinning device, the blade 610 of screw electrode 600 is crossing with annular sealing strip 100 through the upper corresponding screwed hole 130 of annular sealing strip (100), and blade 610 and the inwall of described screwed hole 130 of its intersection keep the spacing of 1-5mm;
Described drive system 300 is made up of driving wheel 310, inducer 320, drive motors 330 and driving belt 340, described driving wheel 310 is identical with inducer 320 diameter, the two axis is in same level and be parallel to each other, described drive motors 330 drives driving wheel 310 to rotate by driving belt 340, thus drives inducer 32 and driving wheel 310 synchronous axial system; Described annular sealing strip 100 is set on driving wheel 310 and inducer 320, two ends of annular sealing strip 100 and driving wheel 310 and the direct contact portion looping band of inducer 320, upper pars intermedia between two ends is the lower pars intermedia between upper active section 110, two end is lower free segment 120;
Described line slideway 200 is two pieces, every block line slideway forms by guide rail draw-in groove 210 and installing hole 220, two pieces of line slideway 200 symmetries be individually fixed on the upper end, two side, front and back of material fluid bath 700 by installing hole 220, the opening of two pieces of guide rail draw-in grooves 210 is staggered relatively, two ends of the upper active section 110 of described annular sealing strip 100 embed within the guide rail draw-in groove 210 of two pieces of guide rails respectively, and described annular sealing strip 100 and material fluid bath 700 form the cabinet space of a relative closure jointly; The upper active section 110 of described annular sealing strip 100 is arranged within line slideway 200, and lower free segment 120 to be positioned at below material fluid bath 700 and to be in free state;
Support frame as described above platform 500 is box-type support pallet; Described driving wheel 310, inducer 320, material fluid bath 700, drive motors 330 and isochronous controller 400 are all fixed on the upper surface of support pallet 500; Described material fluid bath 700 is between described driving wheel 310 and inducer 320; Drive motors 330 is connected with the spindle nose of screw electrode 600 by driving belt 340;
Described isochronous controller 400 controls the rotary speed of screw electrode 600 and annular sealing strip 100, with the linear velocity direction of the linear velocity and annular sealing strip 100 that ensure screw electrode 600 and in the same size.
The material of described annular sealing strip 100 is the conductive material or insulating materials that are not dissolved by spinning liquid or corrode.The described conductive material do not dissolved by spinning liquid or corrode is stainless steel, copper, iron or aluminium.The described insulating materials do not dissolved by spinning liquid or corrode is polymer composite, pottery, timber.Described polymer composite is engineering plastics or resin.
Isochronous controller 400 is as follows for the Principle of Synchronic Control of the linear velocity of screw electrode 600 and annular sealing strip 100: first, suppose the relevant parameter of the screw electrode in material fluid bath:
The pitch of screw electrode is: P (mm);
The diameter of the helical blade of screw electrode:
The rotating speed of screw electrode: W1 (turning/min);
The radius of driving wheel and inducer is: R (mm);
The rotating speed of driving wheel is: W2 (turning/min)
The radius of driving wheel is: R (mm);
The linear velocity of screw electrode: V1
The linear velocity of annular sealing strip: V2
As from the foregoing:
The linear velocity of screw electrode: V1=P*W1 (mm/min),
The linear velocity of annular sealing strip: V2=2 π RW2 (mm/min)
Make V1=V2, equation 1:PW1=2 π RW2 namely
Equation 2:W2=PW1/2 π R (turning/min) can be released by equation 1
As long as make the rotating speed of driving wheel and screw electrode meet above equation 2, can ensure in the process rotated at screw electrode, the linear velocity of annular sealing strip and screw electrode is consistent, the screwed hole that the blade of screw electrode is corresponding with it remains and is synchronized with the movement, do not contact, both the normal rotary spinning of screw electrode can have been ensured, can realize again spinning liquid volatilization suppression to a great extent in material fluid bath, be conducive to the long-time stable of spinning liquid, be conducive to the long-time stable of spinning state, the long continuous for equipment is run and is provided guarantee.
Beneficial effect of the present invention is as follows:
Synchronous circulating type helixseal belting for electrostatic spinning of the present invention for: the material fluid bath of spiral electrospinning device cannot effectively be closed, and the rapid, high volume of the material fluid bath internal solvent caused volatilizees, the concentration of the spinning solution caused and viscosity increase gradually, have a strong impact on the stability of electrostatic spinning and the quality of fiber, even cause producing and interrupt, cannot the defects such as long continuous production be carried out; By the Synchronization Control of the linear velocity to annular sealing strip and screw electrode, achieve screw electrode effective suppression to the volatilization of material fluid bath internal solvent in the process of rotary spinning, be conducive to the long-time stable of concentration of dope and viscosity, the long-time continuous being beneficial to electrospinning device is run, for the commercial application of spiral electrospinning device provides guarantee.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention;
Fig. 2 is the front view of Fig. 1;
Fig. 3 is the top view of Fig. 1;
Fig. 4 is that generalized section is looked on a left side of Fig. 1.
Detailed description of the invention
The present invention is further described below in conjunction with drawings and Examples.
Following examples adopt spinning equipment to be spiral electrospinning device, and spinning liquid is the molecular weight of the PVDF of 12%w/v, PVdF is 500,000, and the range of viscosities of spinning liquid is 1100 ± 50cP; Spinning liquid is by being added by the powder of PVDF in the mixed solvent of acetone and DMF, constant temperature 25 DEG C, fully stirs and obtains for 12 hours;
The relative dimensions of selected material fluid bath 700 and screw electrode 600 is as follows:
(1) the length L1=500mm of screw electrode 600; (2) pitch P=100mm of screw electrode; (3) the helical blade diameter of screw electrode
(4) the helical blade thickness D1=3mm of screw electrode; (5) the rotating speed W of screw electrode
1=6 (turn/min); The length L2=600mm of material fluid bath 700; The material fluid bath degree of depth=80mm; Width=the 110mm of material fluid bath, the both sides wall thickness=10mm of material fluid bath;
By Fig. 1, Fig. 2, Fig. 3 and Fig. 4 is known, synchronous circulating type helixseal belting for electrostatic spinning of the present invention is by annular sealing strip 100, line slideway 200, drive system 300, isochronous controller 400 and support pallet 500 form, described annular sealing strip 100 is the endless belt-shaped of even width, annularly the center line of band is dispersed with spacing, the screwed hole 130 of consistent size, the spacing of adjacent two screwed holes is consistent with the pitch of material fluid bath 700 inside spin electrode 600, the blade 610 of screw electrode 600 is crossing with annular sealing strip 100 through corresponding screwed hole 130, blade 610 and the inwall of screwed hole 130 of its intersection keep the spacing of 1-5mm,
Line slideway 200 length is L2=600mm, width is consistent with material fluid bath wall thickness is 10mm, guide rail card groove depth is 3mm, width is 1mm, annular sealing strip is made up of stainless steel band, the width of stainless steel band is 115mm, thickness is 0.6mm, length is the integral multiple of pitch P is 2500mm, cross central line along stainless steel band beats rectangle screwed hole, the center line of rectangle screwed hole and the angle on stainless steel band both sides are arctan (2.0) (bracket is necessary herein), the length of rectangle screwed hole is 85mm, the head and the tail of stainless steel band are carried out seamless welding circlewise,
Wherein line slideway 200 is divided into two pieces, front and back, there are guide rail draw-in groove 210 and installing hole 220 respectively, the installing hole 220 aiming at line slideway punches on the both sides of the upper end open of material fluid bath, first wherein one piece of line slideway is installed on the side upper surface of material fluid bath, be screwed, then by the upper active section 110 of annular sealing strip 100 while stick in the guide rail draw-in groove 210 of the line slideway fixed, and then the another side of the upper active section 110 of annular sealing strip 100 is sticked in the guide rail draw-in groove 210 of another block line slideway, two pieces of line slideways 200 are parallel to each other and are symmetrically distributed in the both sides, front and back of material fluid bath upper end, the spacing of two pieces of line slideways makes the active section of annular sealing strip (110) can be free to slide within the draw-in groove of two line slideways,
Drive system 300 is made up of driving wheel 310, inducer 320, drive motors 330, driving belt 340, driving wheel is identical with the diameter of inducer, the two axis is in same level and be parallel to each other, annular sealing strip 100 is set on driving wheel 310 and inducer 320, two ends of annular sealing strip 100 and driving wheel 310 and the direct contact portion looping band of inducer 320, upper pars intermedia between two ends is the lower pars intermedia between upper active section 110, two end is lower free segment 120; Drive motors 330 is driven by drive motors 330 by driving belt 340, and the upper active section 110 of annular sealing strip 100 is limited within line slideway 200, and lower free segment 120, through the empty stomach supported pallet and material fluid bath, is in free state;
The axis of the center line of the upper active section 110 of annular sealing strip 100 and the helical axis 620 of screw electrode 600 is parallel to each other, the blade 610 of screw electrode 600 is crossing with annular sealing strip 100 through screwed hole 130, the two intersection, the inwall of blade 610 and screwed hole 130 keep certain spacing everywhere, so, the upper active section 110 of helixseal band 100 just forms the space of a relative closure jointly with material fluid bath 700.
Isochronous controller 400 is by controlling rotating speed and the direction of screw electrode 600, and the rotating speed of annular sealing strip 100 and direction, ensure that the linear velocity of screw electrode 600 is identical with the linear velocity direction of annular sealing strip 100, size is identical, annular sealing strip 100 like this just together constitutes the space of a relative closure with material fluid bath 700 when coordinating screw electrode 600 to rotate, achieve effective suppression of volatilizing to the rapid, high volume of the organic solvent in material fluid bath 700.
The voltage that screw electrode applies starts to produce taylor cone and spinning for during+45kV, reception is the stainless steel rider of ground connection to electrode, stainless steel rider and screw electrode are parallel to each other, be positioned at directly over screw electrode, the beeline of the two is 17cm, and the nanofiber produced is in the surperficial accumulation film forming of stainless steel rider.
So, the sustainable stable operation of spinning process of screw electrode reaches more than 10 hours, in theory, as long as ensure that the sufficient equipment of spinning liquid can more than continuous and steady operation 240h, can meet industrialization Production requirement
Isochronous controller is as follows for the Principle of Synchronic Control of the linear velocity of screw electrode 600 and annular sealing strip 100:
First, the relevant parameter of the screw electrode in material fluid bath is supposed:
The first pass size of annular sealing strip and drive system is as follows:
(1) diameter of driving wheel
300mm; (2) the rotating speed W2:(of driving wheel turns/min); (3) drive
The rotating speed W3 (turning/min) of motor; (4) speed reducing ratio R;
As from the foregoing:
The linear velocity of screw electrode: V1=P*W
1(mm/min);
The linear velocity of annular sealing strip:
Speed reducing ratio: R=W
3/ W
2;
Make V
1=V
2, that is:
Known:
Order: R==15.708, that is: 15.708=W
3/ W
2,
Known: W
3=10 turns/min
As from the foregoing, under above condition, when speed reducing ratio R is 15.708, the rotating speed W of drive motors
3be set as 10 turns/min, the linear velocity of annular sealing strip and screw electrode just can be made to be consistent, the screwed hole that the blade of screw electrode is corresponding with it remains and is synchronized with the movement.
The material of annular sealing strip can be any material, can be conductive material, also can be insulating materials.Conductive material can be conducting polymer, metal stainless steel, copper, iron, aluminium, gold, silver or metal alloy etc., and insulating materials can be engineering plastics, resin, pottery, timber or insulating polymer composite; But to the major requirement of the material of annular sealing strip not by the dissolution with solvents of spinning liquid or corrosion.