CN101255236B

CN101255236B - Use of asymmetric polypropylene porous membrane

Info

Publication number: CN101255236B
Application number: CN2008101021955A
Authority: CN
Inventors: 李林; 肖星; 周建军; 王磊
Original assignee: Institute of Chemistry CAS
Current assignee: Institute of Chemistry CAS
Priority date: 2008-03-19
Filing date: 2008-03-19
Publication date: 2010-11-10
Anticipated expiration: 2028-03-19
Also published as: CN101255236A

Abstract

The invention belongs to polypropylene porous membrane field, especially relates to a use of unsymmetrical polypropylene porous membrane. The unsymmetrical polypropylene porous membrane can be used for isolating oil and stain, especially for isolating edible oil and stain. The porous surface of the unsymmetrical polypropylene porous membrane has micropores interpenetrating from the film surface through the main body and another film surface has no micropores or a little micropores. The unsymmetrical polypropylene porous membrane can be used as oil stain barrier material using the theory that: the porous surface of the unsymmetrical polypropylene porous membrane can absorb a large amount of oil fume granules, but the oil fume granules can not interpenetrate another surface without micropores or a little micropores. The unsymmetrical polypropylene porous membrane can make the cleaning oil and stain more simply and thoroughly, and effectively solve the problem of cleaning oil and stain of kitchen sanitary installation such as oil pumping machine and protect the device or installation from being polluted and corraded by oil and stain.

Description

The purposes of the polypropylene porous film of asymmetry

Technical field

The invention belongs to the polypropylene porous film field, particularly the purposes of the polypropylene porous film of asymmetry.

Background technology

At present, the cleaning problems of kitchen oil stain as the cleaning of smoke exhaust ventilator, vent fan and other sanitary facility, makes us puzzlement always.These kitchen and bath facilities are removed difficulty after being infected with greasy dirt, bring very big inconvenience to use.Simultaneously, contain carcinogens composition and old and feeble agent composition in the greasy dirt, also can damage health of human body.So far, oil removal adopts wet-cleaned mostly.Still contain dissolved carcinogens and old and feeble agent in the sewage that wet-cleaned produced.When these sewage are trickled down at kitchen tools, tableware or are infected with on skin, people's healthy meeting is caused very big threat.Simultaneously, to sticking to the greasy dirt of body surface for a long time, adopt wet method also to be difficult to clean up.

Along with progress of science and technology, more existing technology have been broken conventional wet-cleaned, and isolation smeary method is provided.The solution sprayings that adopt form one deck greasy-dirt separation film at body surface at body surface more in these technology after solvent evaporates.Clear and 55-99665), Chinese patent " spary coating type, peelable greasy-dirt separation film " (publication number: CN1129237A), Chinese patent " ventilator greasy dirt protective agent " (publication number: CN1072431A), Chinese patent " greasy-dirt separation film " (publication number: CN1312343A) as: Japanese Patent " the used in air exchange fan overlay film forms agent " (publication number:.But these methods all exist some shortcomings: the organic solvent that is evaporated in the solution film forming process may damage the person; Wayward to spraying simultaneously than the zonule.

We had once reported polypropylene porous film of a kind of asymmetry and preparation method thereof (Chinese patent, application number: 200710099005.4).When adopting the perforating action of β crystalline substance in drawing process to prepare the technology of polypropylene porous film, have only the β crystalline substance to have perforating action, and the α crystalline substance does not have perforating action.Therefore, by the crystal habit of two different surfaces of sheet before the control stretching, can prepare polypropylene porous film with asymmetry.Wherein, a surface has the micropore that penetrates into body from the film surface, another surperficial pore-free or the polypropylene porous film (as shown in Figure 1) of the asymmetry of a small amount of micropore is arranged is that a class ideal is used for the isolated mould material of greasy dirt.

Summary of the invention

The purposes that the purpose of this invention is to provide a kind of polypropylene porous film of asymmetry.

The polypropylene porous film of asymmetry of the present invention can be used in greasy dirt isolates, and is particularly useful for the edible oil smeary and isolates.

The polypropylene porous film of asymmetry of the present invention is to adopt application number: 200710099005.4 films, a porous surface of this film has the micropore that penetrates into body from the film surface, the surperficial pore-free of another of film or a small amount of micropore is arranged.

The porosity of the porous surface of the polypropylene porous film of described asymmetry is 30～90%, and another surperficial porosity is 0～20%.

The aperture of micropore on the polypropylene porous film of described asymmetry＜5 μ m, preferred aperture＜1 μ m.

The thickness of the polypropylene porous film of described asymmetry is 5～100 μ m.

The present invention covers by the polypropylene porous film with asymmetry and is subject to the body surface that oil smoke stains, utilize a large amount of adsorbed oil smoke particles of porous surface energy of the polypropylene porous film of asymmetry, and the principle (as shown in Figure 2) that sees through of another surface of micropore or a small amount of micropore never can be used it for the greasy dirt isolated material.This purposes of the polypropylene porous film of asymmetry makes the cleaning greasy dirt become thoroughly simple, can effectively solve the oil removal difficult problem of Kitchen hygiene facilities such as smoke exhaust ventilator, and the protection installations and facilities are not polluted by smeary and corroded.

Utilize asymmetry polypropylene porous film adsorbed oil smoke particle synoptic diagram as shown in Figure 2, porous surface can adsorbing edible oil and steam thereof, and smoke particle is penetrated in the body; Because another surface does not have micropore or a small amount of micropore, smoke particle can't see through barrier film, thereby plays the isolated effect of greasy dirt.The polypropylene porous film safety non-toxic of this class asymmetry, material extensively is easy to get, cost is cheap, use temperature can be up to 120 ℃, use simple, solved smoke exhaust ventilator, vent fan and other sanitary facility consuming time, frequent in cleaning process, impair one's health and cause a series of problems such as object top layer wearing and tearing.

The embodiment of the invention 1 has verified that the porous surface of the polypropylene porous film of asymmetry can adsorb oil droplet, and oil droplet can not be penetrated into another surface, as shown in Figure 3.This experimental result illustrated when the polypropylene porous film of asymmetry is used for the greasy dirt isolation purposes, can not make greasy dirt see through barrier film and pollutes by the surface of isolated area, plays the effect of 100% protection body surface.The polypropylene porous film that embodiment 2 has simulated smoke exhaust ventilator device and asymmetry is used for the effect of this device.Can see that from Fig. 4 (b) the smoke exhaust ventilator simulator is by oil pollution along with the edible oil volatilization of being heated.Not high-visible by the regional greasy dirt of the polypropylene porous film of asymmetry covering; The zone that the polypropylene porous film of asymmetry covers is then bright and new as new, shows no sign of to be subjected to the smeary pollution, presents excellent greasy dirt isolation performance, shown in Fig. 4 (c).This also provides experiment support for carrying out of each embodiment of back.In embodiment 3～5, we cover the polypropylene porous film of asymmetry on the bottom of smoke exhaust ventilator, be subject on the metope of oil pollution and on the blade on the vent fan, as the greasy-dirt separation film of protection Kitchen hygiene facility.

The invention will be further described below in conjunction with drawings and Examples, but should not regard limitation of the invention as.

Description of drawings

Fig. 1. the polypropylene porous film porous surface (a) of asymmetry and the stereoscan photograph of another surface (b).

Fig. 2. the synoptic diagram of the polypropylene porous film adsorbed oil smoke particle of asymmetry.

Fig. 3. the polypropylene porous film of asymmetry is poured before the food oil (a) and the photo of (b) afterwards in the embodiment of the invention 1.

Fig. 4. (a) and (b, photo c) afterwards before the work of smoke exhaust ventilator simulator in the embodiment of the invention 2.

Fig. 5. (a) and the photo of (b) afterwards before the polypropylene porous film of asymmetry is used for working on the smoke exhaust ventilator bottom in the embodiment of the invention 3.

Embodiment

Embodiment 1

With 5 areas is 14cm * 8cm, thickness is 40 μ m, the aperture is that the polypropylene porous film of the asymmetry of 250nm is stacked together, porous surface is all made progress, it is 76% the micropore that penetrates into body from the film surface that one porous surface of film has porosity, and the surperficial porosity of another of film is 10%.Polypropylene porous film (porous surface) central zone to first asymmetry is poured the 2mL edible oil into.Be used to observe the experiment of the polypropylene porous film absorption food oil of asymmetry.Fall photo before the edible oil shown in Fig. 3 (a).After pouring edible oil into, oil is sprawled and is come, and first film becomes transparent.Mention a jiao of first film this moment, and second film is still intact, does not find that food oil appears from first film, and photo is shown in Fig. 3 (b).

Embodiment 2

With an area is 6cm * 2cm, thickness is 25 μ m, the aperture is that four jiaos of polypropylene porous film of the asymmetry of 130nm are bonded at the center that an area is 6cm * 3cm scraps of paper with double sticky tape, make porous surface deviate from the scraps of paper, it is 62% the micropore that penetrates into body from the film surface that one porous surface of film has porosity, and the surperficial porosity of another of film is 20%.Get through 7 holes with punch tool, the bottom of simulation smoke exhaust ventilator.Get the round-bottomed flask of a 500mL, add 30mL edible oil and a stirrer.With the polypropylene porous film porous surface of asymmetry on the above-mentioned scraps of paper down, be suspended in the flask.The flask bottleneck is filled in Bent tube stopper then, and bleeds with surge pump, the device of simulation smoke exhaust ventilator.This device as for heated and stirred in 250 ℃ the oil bath 2 hours, is used to simulate the experiment of smoke exhaust ventilator Working environment.Fig. 4 (a) and Fig. 4 (b) are respectively the photo of the scraps of paper before and after heating that is stained with the polypropylene porous film of asymmetry.Fig. 4 (c) is the photo that takes off the scraps of paper behind the polypropylene porous film of asymmetry after the heating.

Embodiment 3

With an area is 70cm * 20cm, thickness is 55 μ m, the aperture is the lower surface that the polypropylene porous film of the asymmetry of 320nm is attached to smoke exhaust ventilator, make porous surface outside, it is 83% the micropore that penetrates into body from the film surface that one porous surface of film has porosity, and the surperficial porosity of another of film is 5%.Be used to observe of the effect experiment of the polypropylene porous film of asymmetry as smoke exhaust ventilator greasy-dirt separation film absorption oil smoke.Fig. 5 (a) and Fig. 5 (b) are respectively the smoke exhaust ventilator photos that is coated with the polypropylene porous film of asymmetry before and after the cooking.

Embodiment 4

With an area is 50cm * 50cm, thickness is 70 μ m, the aperture is that the polypropylene porous film of the asymmetry of 80nm is attached on the wall that closes on gas range, make porous surface outside, it is 55% the micropore that penetrates into body from the film surface that one porous surface of film has porosity, the surperficial pore-free of another of film obtains the metope of the polypropylene porous film of asymmetry as greasy-dirt separation film.

Embodiment 5

With thickness is 25 μ m, the aperture is that the polypropylene porous film of asymmetry of 60nm is according to the cutting of vent fan blade dimensions, be attached on the blade, make porous surface outside, it is 78% the micropore that penetrates into body from the film surface that one porous surface of film has porosity, the surperficial porosity of another of film is 13%, obtains the vent fan blade of the polypropylene porous film of asymmetry as greasy-dirt separation film.

Claims

1. the purposes of the polypropylene porous film of an asymmetry is characterized in that: the polypropylene porous film of described asymmetry is used for greasy dirt and isolates;

One porous surface of the polypropylene porous film of described asymmetry has the micropore that penetrates into body from the film surface, the surperficial pore-free of another of film or a small amount of micropore is arranged;

2. purposes according to claim 1 is characterized in that: described greasy dirt is the edible oil greasy dirt.

3. purposes according to claim 1 is characterized in that: the thickness of the polypropylene porous film of described asymmetry is 5～100 μ m.

4. according to claim 1 or 3 described purposes, it is characterized in that: the aperture of micropore on the polypropylene porous film of described asymmetry＜5 μ m.

5. purposes according to claim 4 is characterized in that: the aperture of micropore on the polypropylene porous film of described asymmetry＜1 μ m.