JPS58141220A - Treatment of microporous cellulosic film - Google Patents

Abstract

PURPOSE:To render a microporous cellulosic film hydrophilic without affecting the nature of its pores, by subjecting the microporous film of a cellulose derivative to a plasma treatment by high-frequency excitation. CONSTITUTION:A microporous film prepared from a cellulose derivative such as cellulose nitrate or cellulose acetate is subjected to a plasma treatment by high- frequency excitation. The plasma which can be applicable is a low-temperature plasma belonging to non-equilibrium plasma, which has an advantage of having little thermal influence on the film to be treated. Although there are several discharge systems such as an internal-electrode system, an external-electrode system, etc., the external-electrode system is preferred. As the gas, an inorganic gas, especially an inert gas such as argon, helium or nitrogen is used. The advantage of the plasma treatment is that the effect of modification extends only to a surfacial layer of a depth of several tens-several thousands Angstrom and, therefore, the essential characteristics of the film are not changed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides fiber cable systems such as steel 111 wax fibers or butyric acid fiber cables.
This article concerns the processing power method that imparts hydrophilicity without commercially increasing the properties of the pores in the conductor ↓ imitative microporous injection film. More specifically, the surface of a microporous film such as a fiber bulk casting body is subjected to a glazma treatment using four-frequency excitation to completely impart hydrophilic properties to the film without substantially changing the pore properties of the film. It's about how to do it.

The imitation km porosha film made of filamentous dielectric material such as nitrate rhItm type or butyric acid fiber type has recently been widely used in the precision p application, etc.
However, since it is hydrophobic, a surfactant such as glycerin, tri-7, hydrixinolobil cellulose, or Hatridon X-100 is used to give it hydrophilicity. As a successor, will I add VC cancer? l
Secondary treatment pipes are often treated with these wetting agents.

However, these wetting agents are undesirable because they migrate into the temporary treatment liquid, PlfL, etc. and have an adverse effect on these liquids.

In order to prevent these wetting agents from forming, it is customary to perform pre-smoothing and pre-cleaning before actual use, which is time-consuming and extremely difficult to completely remove these wetting agents. . Furthermore, the presence of such wetting agents causes non-uniformity of dripping, or these wetting agents change and cool down over time, and evaporate from the next step, resulting in a deterioration of hydrophilicity, and many other drawbacks are rare. .

The present inventors have overcome the drawbacks of such conventional methods and have conducted extensive research in order to develop a method that can impart only hydrophilicity to porous materials without impairing their pore properties through simple operations. Layer nine knots on the surface of the cellulose-based fiL microporous film? 161
Hydrophilic τ1・
Based on this finding, we have come up with the present invention. That is, the present invention is directed to the production of a finely porous film made of finely woven fibers, whose surface is subjected to a nolasma treatment by high-frequency excitation (also known as VC) to impart hydrophilicity to the film. The thing that makes the place '1 power hx summary is Riru O Norazuma can be roughly divided into senryo guratsuma (thermal guratsuma) and non-harvest! Although it is classified as Udema (low-temperature Norasma)4, it is also used for low-temperature Norasma belonging to non-equilibrium Glatumas9, and it has a thermal effect on F4J Rem, which is the target of treatment. O, which has the advantage of having less
By applying an Amm electric current J' at a pressure of /J//, a nolasma is formed, and by acting on six sides of the nt-treated urine, the surface plate' fibers are produced.

For the left type, μ internal 6μ electrode force type, external IIL type, etc.
There are many types of cypresses, but the external electrode method is preferable.

For example, a small 1I5B gas such as Kuroiso gas, especially alcohol, helium, or nitrogen, is used.

The advantage of NORAZMA treatment is that the modification effect is limited to the surface layer at a depth of several tens of angstroms to several tens of angstroms and does not change the essential properties of the film. Further, the processing time varies by a certain amount s1 depending on other processing conditions, but it is generally considered to be 10 seconds to 60 seconds4.

Due to this Glatsma treatment, the permeability, rupture resistance, and nodal point values of the single fiber microporous film hardly change, and the external properties do not change either. If you leave it there, it will not change even after 3t months have passed, and the temperature will remain at 120℃, 3
Its hydrophilicity can be maintained sufficiently even after autoclaving for 0 minutes. Further, even after hot air drying at 105° C. for 2 hours, the hydrophilicity is maintained even when the temperature is returned to room temperature.

Next, an example of the actual NI uniformity of the present invention will be explained with reference to the accompanying drawings. FIG. 1 is a schematic explanatory diagram of a Glazma treatment apparatus suitable for carrying out the method of the present invention.
The object to be processed 2 is placed inside the chamber. Open the valve 3 and reduce the pressure to the specified true wall l1 (12 is the vacuum needle) with the A valve 9, while controlling the flow rate y4 and the control valve 4 to flow a constant amount of gas ((5μ gas ♂).

This gas is excited by the simple wave coil 6, and the object to be treated is subjected to 2σ glasma treatment. In the seventh case, the gas is discharged from the discharge port IO. In the figure, 8 is an ammeter,
11 is set using the fi1m adjuster.

Argon gas was used as the primary gas for this process, but helium and nitrogen gases can also be used as well if they are inert gases.

The degree of vacuum is 1 to Q, 1 torr, and the power of 20 to 50 watts is 7 tons.

Even if the cellulose-based microporous film treated according to the present invention is processed, it retains excellent hydrophilicity even if it is not subjected to wet abrasion, resulting in a clean porous film. In addition, in order to maintain oJ plasticity, the treatment of the present invention also praises the effect of reducing the extraction wrinkles of glycerin and the like.

Refreshing Example 1 Test I Test ■ Nitrified cotton 35 parts 35 parts acetone
140 140 Emenol 12 U
120n-! Tanol 1t) 0
100th Ward-■ Exam...Wednesday 12th part 1
2g Glycerin 03 The bath solution as shown in the above table (Test 11 Test-U) was polished to VctL on a glass plate, and the temperature [30℃, species number 70 rice cake -9] was about 1
After drying for a while, peel it off from the glass plate and attach it to the frame.
It was heated at 0°C for 1 hour. (obtained) (lum t5 tar
rnln (0°75 with vacuum bonno 9, competing with D discount)
After exhausting torr 4C, turn on the high wave power source 8, set the power to 50 watts, and set the power to 13.56 to 111%.
A 1116Itd wave current of kllklz was applied to generate a glasma interaction.

The treatment time was changed to 10 seconds, 30 seconds, and 60 seconds. After processing for the specified time, stop applying the A11llll wave current, open the processor, take out the film, and conduct 90 experiments.
t Cotton 1.5% 1.5 s Sansuzu-1,51,5 Ethanol l (J 10 Silicated melan 40 40 Water
1.5 1.
5 Grit phosphorus 00.5 Death as shown in the table above (test fiber, test)
At 1 o'clock, the wax was made, the glass was pierced, and the frame was fixed. 1
(llj℃, 1 hour transition line tO was obtained. Obtained t')] 1
Cut the lumen to 5cmXlOm and use the argon gas 50Jy'pi on the bench IC of the Glazma treatment weir shown in the figure.
After draining 0.5 torr VC as compared to n, ^-
A wave electric current of 61 ikf was turned on, the power was set to 50 watts, and a 11li wave current of 13.56 Mllz was applied to the sieve electric coil to generate an l simmer. Processing time is 10 seconds, 3
0 seconds, 1) After processing the current situation for a while, I stopped applying the power, released the torture insects, and released films t and 9.

Experimental Example 3 - Example 1. The 25 bird vczr of the valley test sample of Experimental Example 2 was removed, floated on steamed rice water soil at 25°C, and the time (seconds) required for it to be completely immersed was measured. In addition, some of the samples were subjected to hot air blast treatment at 1100°C for 2 hours and π-i crepe treatment for 120C to 0 minutes, so that the results were not satisfied.
The binding is shown in Table 1.

14 1 Table - Example 4 The general physical properties of each sample of Example 2 were measured using a fire test. The fine powder t-MZ table shows 73<.

Table 2 Experimental Example 5 Add 1 ton of water to a 300114 Erlenmeyer flask,
One 479 sample was taken, accurately weighed, and sealed. 121C-30 minutes autoclay! After processing,
The amount of #-marked glycerin in water was quantitatively analyzed using gas chromatography. The results are shown below.

Sample: Test extraction amount of Experimental Example 1: Glazma-treated product 3.9/φ47% Glazma-treated product 0.5s/to φ47 (30 seconds cycle)

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram of an i &amp;

Claims (1)

[Claims] A processing power method for a porous film that imitates fiber S, in which a microporous film made of fiber A is subjected to glazma treatment by frequency excitation.