CN102539299A

CN102539299A - Method for determining porosity of film porous materials by medium soaking method

Info

Publication number: CN102539299A
Application number: CN2011104514532A
Authority: CN
Inventors: 庞桂花; 张永明; 张恒; 唐军柯; 申玉鹏
Original assignee: Shandong Dongyue Polymer Material Co Ltd
Current assignee: Shandong Dongyue Polymer Material Co Ltd
Priority date: 2011-12-29
Filing date: 2011-12-29
Publication date: 2012-07-04

Abstract

The invention relates to a method for determining the porosity of film porous materials by a medium soaking method. According to the method, single high-boiling-point medium solution is adopted, according to a fluid static principle, the film porous materials receives the gravity and external force balance in the medium liquid, and a porosity calculation formula is obtained. The method has the advantages that the used instrument is simple, the cost is low, the operation is easy, and the porosity of the film porous materials can be accurately and effectively measured.

Description

The medium infusion method is measured the method for film porosity of porous material

Technical field

The present invention relates to a kind of medium infusion method and measure the method for film porosity of porous material, particularly a kind ofly soak the method that film porosint to be measured obtains the film porosity of porous material, belong to film porosint determination techniques field through medium solution.

Background technology

The film porosint has indispensable effect with its unique manufacturing process and performance in the various aspects of producing, live.In health care, ceramic art, civil engineering work and industrial application, porosity is to weigh one of performance parameter that film porosint quality wants most.

The conventional media infusion method generally adopts pure water, toluene, ethanol, chlorination carbon etc. to measure porosity as medium solution; But these medium solutions can't be applied to the mensuration of porosity of porous material; As: pure water makes the film porous material surface adhere to bubble, and is difficult for getting rid of; Toluene, ethanol, phenixin etc. are volatile; Above-mentioned factor all can cause weighing data to have deviation, thereby causes final test result inaccurate.Therefore, those skilled in the art abandon simple method of testing then adopt complicated instrument and equipment to measure porosity.

Test porosint voidage adopts electron-microscope scanning picture law, mercury intrusion method, bubble point method, gas adsorption method mostly at present, methods such as kurt instrument, but these methods all need adopt expensive instrument and equipment.Chinese patent document CN1958933A (application number 200610118729.4) has introduced a kind of porosity of not weaving fabric measuring method and system; Measuring method comprises at first carries out the non-weaving cloth sampling; Gather the non-weaving cloth image then, handle the non-weaving cloth image, measure porosity of not weaving fabric.System of the present invention comprises microscope, light source, ccd video camera, interface annex, image pick-up card, computing machine.Though these method and system can be measured the porosity of non-weaving cloth accurately and efficiently, will play a positive role aspect non-weaving cloth quality test and the evaluation, complex structure, not easy to operate, and cost is higher.

Summary of the invention

The present invention is directed to the deficiency of prior art, provide a kind of medium infusion method to measure the method for film porosity of porous material, this method can test out the porous film material porosity simply, accurately and efficiently.

A kind of medium infusion method is measured the method for film porosity of porous material, may further comprise the steps:

(1) the aerial quality of weighing film porosint to be measured sample records weight numerical value Wa;

(2) be suspended on film porosint sample to be measured on the balance hook, be immersed in the medium solution, the mark lower draw-bar is immersed in the length of medium solution, after pending data is stable, records weight numerical value Wb;

(3) from medium solution, take out film porosint sample to be measured, remove surface dielectric solution, the aerial weight W c of film porosint sample to be measured weighs with scale;

(4) the balance hook is immersed in the medium solution, immersion length is identical with the length of mark in the step (3), after pending data is stable, records weight numerical value Wd;

(5) the numerical value substitution formula that step (1)～step (4) is recorded

Calculate porosity; Wherein, ρ ₁Be the density of medium solution, ρ ₂Density for the corresponding compact solid material of porosint;

Medium solution in said step (1)～step (4) is carbon tetrafluoride, perflexane, PF 5070, perfluorodecalin, Freon 13 or PFO; Preferably, the said fluorous solvent that contains is carbon tetrafluoride, Freon 13 or PFO.It is big that above-mentioned medium solution has density, and expansion coefficient is little, and steam forces down, and viscosity is low; Be prone to flow, surface tension is low good to the porosint wellability, and lubricity makes the specimen surface bubble be prone to eliminate well; And have with porosint sample to be measured and do not react, do not dissolve non-swelling characteristic.

The length of the film porosint sample to be measured in the said step (1) is 1-30cm, width 1-30cm.

Beneficial effect

1, the method for the invention is guaranteed accurately to weigh the quality under the various states of porosint with balance through changing conventional weighing order and the method for operating of soaking into, and extrapolates formula according to the hydrostatics principle, calculates and obtains porosity numerical value.Accurate, simple, easy to operate, lower-cost advantage that this method has.

2, the present invention adopts colorless and odorless, surface tension is low, lubricity good, high boiling fluorine-containing solution is as medium solution; Avoided bubble to adhere to and solvent evaporates; And change conventional weighing order, can test out the porosity of porous film material simply, accurately and efficiently.

Embodiment

Below in conjunction with embodiment the present invention is done further elaboration, but institute of the present invention protection domain is not limited thereto.

Q film described in the embodiment available from nova Feng Hua Membrane Mfg. Co., Ltd., F microporous barrier available from Shanghai Tai Mile Industrial Co., Ltd.; Carbon tetrafluoride, Freon 13 and PFO are available from Quzhou sky over the river fluorine chemistry company limited.

Sample is prepared

5 samples are got in grab sample on Q microporous barrier and F microporous barrier respectively, and it is 3 * 3cm that each test specimens is cut into size ²Sample, and be labeled as sample No. 1, No. 2 samples, No. 3 samples, No. 4 samples, No. 5 samples.

Embodiment 1

As medium solution, measure its density with carbon tetrafluoride, be designated as ρ with densitometer ₁Be 1.748g/cm ³Look into the corresponding compact solid material of Q microporous barrier density p ₂Be 2.1g/cm ³

(1) with No. 1 aerial quality of sample of electronic balance weighing, Wa=0.00732g.

(2) be suspended on No. 1 sample of weighing on the balance hook, be immersed in the pure carbon tetrafluoride solvent, the mark lower draw-bar is immersed in the length in the medium solution.After pending data is stable, reading of data Wb=0.07906g.

(3) take out No. 1 sample after saturated, wipe the medium solution on surface gently, weigh its aerial weight W c=0.09203g in the balance.

(4) be immersed in the balance hook in the medium solution, immerse length and be as the criterion with ready-made mark, after pending data is stable, reading of data Wd=0.09345g.

(5) each weighing data substitution formula

Calculating porosity is 92.3%, like the θ in the table 1 ₀Shown in.

Repeat above operation and measure No. 2 samples, No. 3 samples, No. 4 samples, No. 5 sample hole rate scores, shown in the θ in the table 10.

Table 1 carbon tetrafluoride is as medium solution Q microporous barrier porosity test data table

Embodiment 2

Measure the method for film porosity of porous material like the described medium infusion method of embodiment 1, difference is: with the pure solution of Freon 13 as medium solution, density p ₁=1.783g/cm ³,

Record: No. 1 each mass Wa=0.00705 of sample, Wb=0.10899, Wc=0.09303, Wd=0.09356.Through calculating porosity is 92.4%.

Repeat above operation and measure No. 2 samples, No. 3 samples, No. 4 samples, No. 5 sample hole rate scores, as shown in table 2.

Table 2 Freon 13 is as medium solution Q microporous barrier porosity test data table

Embodiment 3

Measure the method for film porosity of porous material like the described medium infusion method of embodiment 1, difference is: adopt the F microporous barrier, the pure solution of PFO is as medium solution, density p ₁=1.760g/cm3,

Record: Wa=0.00924g, Wb=0.17987g, Wc=0.09750g, Wd=0.09567g is through calculating, and porosity is 41.5%, and is as shown in table 3.

Repeat above operation and measure No. 2 samples, No. 3 samples, No. 4 samples, No. 5 sample hole rate scores, list in the table 3.

Table 3 PFO is as medium solution F microporous barrier porosity test data table

Case of comparative examples

(1) adopt nitrogen adsorption porosity detector test Q microporous barrier porosity as control experiment, grab sample on the Q microporous barrier, and it is shredded into granule, get 5 sample testings; Each sample takes by weighing 2g left and right sides film, and does label and be: No. 1, and No. 2; No. 3, No. 4, No. 5.Parallel testing gets data in following table 4.

Table 4 nitrogen adsorption method Q microporous barrier porosity detects the examination tables of data

(2) adopt nitrogen adsorption porosity detector test F microporous barrier porosity as control experiment, grab sample on the F microporous barrier, and it is shredded into granule, get 5 sample testings; Each sample takes by weighing the 2g film, and does label and be: No. 1, and No. 2; No. 3, No. 4, No. 5.Parallel testing gets data in following table 5.

Table 5 nitrogen adsorption method F microporous barrier porosity detects the examination tables of data

The data deviation that can find out this method test through parallel laboratory test is less relatively, and with control experiment nitrogen gas absorption method test data mean deviation within 1%.This method can test out the porous film material porosity simply, accurately and efficiently.

Claims

1. the method for a medium infusion method mensuration film porosity of porous material is characterized in that, may further comprise the steps:

Medium solution in said step (1)～step (4) is carbon tetrafluoride, perflexane, PF 5070, perfluorodecalin, Freon 13 or PFO.

2. the method for claim 1 is characterized in that, the said fluorous solvent that contains is carbon tetrafluoride, Freon 13 or PFO.

3. the method for claim 1 is characterized in that, the length of the film porosint sample to be measured in the said step (1) is 1-30cm, width 1-30cm.