CN103762328B - A kind of dividing plate for gelled lead acid battery and preparation method thereof - Google Patents

Abstract

The present invention relates to a kind of dividing plate for gelled lead acid battery and preparation method thereof. It is characterized in that building three-dimensional netted membrane bone frame with PVC, be packed into the diatomite of cheap porous, this both can provide a large amount of holes, also can greatly improve the compatibility of dividing plate and electrolyte; In process, improve the adhesion between diatomite particle and PVC by coupling agent, be aided with modifier simultaneously and further improve the hydrophilicity of dividing plate. The making of this dividing plate has adopted simple cast panel liquid knifing and immersion precipitation method, and technique is simple. The final dividing plate forming has high porosity, and average pore size is little, has good wettability and the compatibility with colloid.

Description

A kind of dividing plate for gelled lead acid battery and preparation method thereof

Technical field

The invention belongs to field of chemical power source, relate to a kind of dividing plate for gelled lead acid battery and preparation method thereof.

Background technology

Lead-acid accumulator is widely used, and worldwide output value output all occupies all kinds of electrochmical power sources first place, and representative battery is wherein analysing valve control type lead-acid accumulator battery. This lead-acid accumulator relies on two kinds of different mode fixed electrolytes, one is AGM technology, by AGM dividing plate fixed electrolyte, most domestic lead-acid accumulator is all by this kind of technology now, but it has, clapboard aperture is too large, withstand voltage properties is bad, easily cause the shortcomings such as sour layering, is replaced by the more advanced colloid technique for fixing of another kind gradually.

Application colloid analysing valve control type lead-acid accumulator battery, has proposed to adapt to the requirement of colloid technology to dividing plate, in the situation that ensureing porosity, should have less aperture, the compatibility that will have colloidal electrolyte, less ion resistance etc. The external a kind of micropore PVC dividing plate that mostly adopts A Moxier company solvent method to produce at present, domestic high-end colloid battery is is also selected and purchased this dividing plate, and other colloid batteries are because cost reason often adopts toward the practice that directly adds colloidal electrolyte in AGM battery. The PVC dividing plate of A Moxier company is to adopt a kind of special mixing and extrusion way to make PVC and precipitated silica, dividing plate has 0.01 μ m-0.1 μ m and two kinds of smaller pore-size distributions of 1 μ m-10 μ m, and the existence of silica can be given the compatibility of dividing plate to colloidal electrolyte. Due to technical know-how reason, cannot understand so far its preparation method, and its production cost is very high.

Domestic have minority unit to study micropore PVC dividing plate, but due to reasons such as high cost, product defectiveness or complex process, do not have so far product to come out. Obviously, domestic lead-acid battery industry is badly in need of having the micropore PVC dividing plate that is applicable to gelled lead acid battery of independent intellectual property right.

Summary of the invention

The present invention is based on the present situation of domestic battery industry, specific requirement dividing plate being proposed for colloid battery, under the prerequisite of guarantee dividing plate key property, has developed production cost and has been significantly less than import dividing plate, technique is simple, and performance can match in excellence or beauty in the dividing plate of import micropore PVC dividing plate.

For a dividing plate for gelled lead acid battery, by raw material PVC, diatomite, coupling agent is dissolved in after the mixing that completes component in lysate, the dividing plate being prepared from through cast panel liquid scraping blade, coagulating bath solution immersion precipitation.

Described PVC is that the PVC of degree of polymerization 1200-1800 sticks with paste resin.

In raw material, each component is counted PVC10%-30% by mass fraction, diatomite 70%-90%; Coupling agent consumption is the 0.01%-1% of PVC and diatomite quality.

Lysate is the one in dimethyl formamide, dimethylacetylamide, oxolane, cyclohexanone, and consumption is 5-10 times of PVC quality.

Described diatomite is through high-temperature heat treatment, decontamination and is ground to the diatomite powder of particle diameter between 1 μ m-50 μ m.

Described coupling agent is organosiloxane or titanate coupling agent; Adopt water or ethanol that coupling agent is mixed with to the mother liquor that mass content is 1%-10%.

Described coagulating bath solution is that lysate mass content is the aqueous solution of 0%-50%.

A method of preparing the dividing plate for gelled lead acid battery as above, comprises the following steps: after PVC, diatomite, lysate, coupling agent are mixed, and heating coupling processing, standing and defoaming; By in blocks cast panel liquid knifing, leave standstill pre-phase-splitting by scraper in air, then in coagulating bath solution, immersion precipitation obtains elementary dividing plate; After splitter plate molding, further soak to improve PVC wettability of the surface energy by surfactant solution, reduce the ion resistance of dividing plate.

A method of preparing the dividing plate for gelled lead acid battery as above, concrete steps are:

(1) PVC is dissolved in lysate, adding mass content is the coupling agent mother liquor of 1%-10%, and 20 DEG C-100 DEG C add thermal agitation 2-5h;

(2) add diatomite, continue to add thermal agitation;

(3) pour mixture into airtight container, be placed in 20 DEG C of-70 DEG C of water-bath standing and defoaming 2-4h;

(4) in blocks with scraper striking, leave standstill 10s-600s;

(5) in coagulating bath solution immersion precipitation, the demoulding is in blocks, dries;

(6) be placed in nonionic or the anionic surfactant solution that mass fraction is 0.1%-10% elementary dividing plate is soaked, dry.

Remarkable advantage of the present invention is: in (1) formula, adopted content up to more than 70% cheap diatomite, the aerosil that the precipitated silica of contrast import dividing plate and domestic some unit adopt, there is obvious price advantage, also make it to have better colloid compatibility; (2), by coupling processing, even if adding more than 70% in diatomaceous situation, dividing plate still has good mechanical performance; (3) prepared partition pores rate is high, and micropore size is distributed between 1 μ m-20 μ m, makes dividing plate under the prerequisite that effectively prevents short circuit, have little resistance; (4) adopt and simply scrape film forming process, the extruding technology adopting than import micropore PVC dividing plate is convenient, is easy to realize industrial production.

The partition pores rate that this invention finally obtains is more than 70%, and maximum diameter of hole is less than 20 μ m, more than hot strength reaches 5Mp, thickness can be made 0.5mm-1mm, be less than 1s by the water-wet time, be applied to after colloid battery, battery serviceability reaches the battery level that adopts the assembling of import dividing plate.

Brief description of the drawings

Fig. 1 is baffle surface scanning electron microscope (SEM) photograph prepared by embodiment 1;

Fig. 2 is baffle surface scanning electron microscope (SEM) photograph prepared by embodiment 2;

Fig. 3 is baffle surface scanning electron microscope (SEM) photograph prepared by embodiment 3.

Detailed description of the invention

Embodiment 1

1. take 5gPVC and be dissolved in 45gDMF solution, adding 0.39g mass content is 1% coupling agent (KH-550) mother liquor, and 100 DEG C add thermal agitation 2h;

2. take 15g diatomite and add, continue to add thermal agitation 1h;

3. pour mixture into airtight container, be placed in 40 DEG C of water-bath standing and defoaming 3h;

4. in blocks with 500 μ m scraper strikings, leave standstill 600s;

5. immerse 70 DEG C of aqueous solution demouldings in blocks, after 3h, take out 60 DEG C of oven dry;

6. be placed in the nonionic surface active agent Brij20 aqueous solution that 25 DEG C of mass content are 0.2%, after 2h, take out, 60 DEG C of oven dry.

Gained baffle surface pattern as shown in Figure 1, has higher porosity and more uniform pore-size distribution, aperture mostly at 5 μ m between 10 μ m. Porosity is 76.5%, and hot strength is 15Mp, and water droplet is 17 ° to the initial contact angle on dividing plate, is 0.2s by the water-wet time.

Embodiment 2

1. take 6gPVC and be dissolved in 45gDMF solution, adding 0.13g mass content is 1% coupling agent (KH-550) mother liquor, and 20 DEG C add thermal agitation 5h;

2. take 15g diatomite and add, continue to add thermal agitation 1h;

3. pour mixture into airtight container, be placed in 20 DEG C of water-bath standing and defoaming 4h;

4. in blocks with 750 μ m scraper strikings, leave standstill 300s;

5. immerse 25 DEG C of aqueous solution demouldings in blocks, after 3h, take out 60 DEG C of oven dry;

6. be placed in the dodecyl sodium sulfate that 25 DEG C of mass content are 10% (SDS) aqueous solution, after 2h, take out, 60 DEG C of oven dry.

Gained baffle surface pattern as shown in Figure 2, has higher porosity and more uniform pore-size distribution, and aperture is mostly smaller than aperture shown in Fig. 1, is that 1 μ m is between 5 μ m. Porosity is 73.2%, and hot strength is 8Mp, and water droplet is 44 ° to the initial contact angle on dividing plate, is 1.8s by the water-wet time.

Embodiment 3

1. take 7gPVC and be dissolved in 45gDMF solution, adding 0.13g mass content is 1% coupling agent (KH-550) mother liquor, and 50 DEG C add thermal agitation 3.5h;

2. take 10g diatomite and add, continue to add thermal agitation 1h;

3. pour mixture into airtight container, be placed in 70 DEG C of water-bath standing and defoaming 3h;

4. in blocks with 750 μ m scraper strikings, leave standstill 10s;

5. immerse 90 DEG C of aqueous solution demouldings in blocks, after 3h, take out 60 DEG C of oven dry;

6. be placed in the nonionic surface active agent Brij20 aqueous solution that 25 DEG C of mass content are 0.1%, after 2h, take out 60 DEG C of oven dry.

As shown in Figure 3, it is fine and close that surface obviously becomes gained baffle surface pattern, and aperture becomes less. Porosity is 72.0%, and hot strength is 7Mp, and water droplet is 58 ° to the initial contact angle on dividing plate, is 1.4s by the water-wet time.

Claims (4)

1. for a dividing plate for gelled lead acid battery, it is characterized in that: by raw material PVC, diatomite, coupling agent is dissolved in after the mixing that completes component in lysate, the dividing plate being prepared from through cast panel liquid scraping blade, coagulating bath solution immersion precipitation; In raw material, each component is counted by mass fraction: PVC10%-30%, diatomite 70%-90%; Coupling agent consumption is the 0.01%-1% of PVC and diatomite quality;

Described PVC is that the PVC of degree of polymerization 1200-1800 sticks with paste resin;

Lysate is the one in dimethyl formamide, dimethylacetylamide, oxolane, cyclohexanone, and consumption is 5-10 times of PVC quality; Described coupling agent is organosiloxane or titanate coupling agent; Adopt water or ethanol that coupling agent is mixed with to the mother liquor that mass content is 1%-10%.

2. the dividing plate for gelled lead acid battery according to claim 1, is characterized in that: described coagulating bath solution is that lysate mass content is the aqueous solution of 0%-50%.

3. a method of preparing the dividing plate for gelled lead acid battery as claimed in claim 1, is characterized in that: comprise the following steps: after PVC, diatomite, lysate, coupling agent are mixed, and heating coupling processing, standing and defoaming; By in blocks cast panel liquid knifing, leave standstill pre-phase-splitting by scraper in air, then in coagulating bath solution, immersion precipitation obtains elementary dividing plate; After splitter plate molding, further soak to improve PVC wettability of the surface energy by surfactant solution, reduce the ion resistance of dividing plate.

4. the preparation method of the dividing plate for gelled lead acid battery according to claim 3, is characterized in that: concrete steps are:

(1) PVC is dissolved in lysate, adding mass content is the coupling agent mother liquor of 1%-10%, and 20 DEG C-100 DEG C add thermal agitation;

(2) add diatomite, continue to add thermal agitation;

(3) pour mixture into airtight container, be placed in 20 DEG C of-70 DEG C of water-bath standing and defoaming;

(4) in blocks with scraper striking, leave standstill 10s-600s;

(5) in coagulating bath solution immersion precipitation, the demoulding is in blocks, dries;

(6) be placed in nonionic or the anionic surfactant solution that mass fraction is 0.1%-10% elementary dividing plate is soaked, dry.