JPH04136266A - Surface treatment of carbon yarn and device therefor - Google Patents

Abstract

PURPOSE:To treat the surface of a carbon yarn in a short time uniformly and safely by passing the carbon yarn through ozone-containing air while heat- treating the carbon yarn between current-carrying electrodes and installing a specific number of electrodes and earthing both ends of the electrodes. CONSTITUTION:Three or more electrodes 2 are installed, both end of the electrodes are earthed, two or more ozone chambers 3 are laid. A carbon yarn 1 heated by current transmission between the electrodes 2 is traveled in the ozone chambers 3 of letting air containing >=10vol.% ozone concentration flow in the same direction as traveling direction of the yarn 1 to carry out the objective oxidation treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is a book relating to a novel surface snow treatment method and apparatus for carbon edge fibers.

[Prior art]

In order to improve adhesion and wettability with the matrix resin, carbon*a is generally subjected to assimilation treatment on the surface of the large fibers, such as chemical fermentation treatment, vapor phase assimilation treatment, Many surface treatment methods have been proposed, including electrolytic oxidation treatment. Pharmaceutical processing? 'i It takes a long time to process and is not suitable for industrial use. Electrolytic oxidation treatment is continuous: C treatment is easy, but cleaning is indispensable to remove loose particles that adhere to the treated material, and there are many problems such as liquefaction treatment of I solution. .

The gas-phase oxidation process has many advantages such as no cleaning required and the equipment is safe. There is a problem.

Contains ozone, which solves one problem in gas phase oxidation treatment.
J! A method of processing in a constant temperature atmosphere (JP-A-61-1)
No. 19769) has been proposed, but ozone decomposes very quickly at high temperatures, and in the method of heating the gas with an external heater (=4M No. 3713, 1986-115), ozone flows from the supply port into the treated system. The amount of carbon that is decomposed before reaching the carbon g & reef layer is the efficiency of the prefecture. Therefore, by taking advantage of the conductivity of carbon #i and heating only the vicinity of the carbon bond, a method of performing gas phase oxidation treatment with full efficiency (Japanese Patent Laid-Open No. 61-119770)
has been proposed. The method of heating and treating carbon wax with electricity is an efficient method that includes ozone oxidation treatment, but there is a risk of electric shock to the human body, so there is a safety rating of 7c.

[The problem to be solved by the present invention is to achieve efficiency without disassembling the entire machine as much as possible: oxidation of the moxibustion fiber cone is carried out uniformly in a short time, and at the same time, workability is improved. The goal is to provide a safe way to do so.

[Means to solve the problem]

The gist of the invention is that carbon Jl! #Element 11 for energizing w, qj1 heat-treated in the dark and then allowed to run through air containing ozone between the electrodes! This is a method and apparatus for surface treatment of carbon sludge, characterized in that five or more electrodes are installed in the surface treatment method, and the electrodes at both ends are grounded.

Pass! By grounding both ends of the device, it is possible to prevent electric shock from sources other than the electric current. If only one end is placed, if the human body comes into contact with the 4D carbon material at the other end, it is extremely dangerous because current may flow through the human body. According to the present invention, work safety can be maintained if all precautions are taken to ensure that only the bag and lid are used. Tensuq &Usui's#Zoukashi'IC> +d in Z, the occurrence of fluff, and there are many trenches that touch directly with iron drills,
In addition to energizing, it is extremely important to ensure safety and complete repairs.

Furthermore, as shown in FIG. 1, by providing two or more chambers into which K and ozone are blown, it is possible to improve the safety and increase the efficiency of the treatment.

However, when carbon fibers in the monosaccharide state are brought into contact with ozone-containing substances, the ozone D assimilation property is 1, so 1. If only the outside of the carbon tow is oxidized and the inside is not oxidized, this happens. I believe that this occurs because the reaction rate is low.Therefore, in order to equalize the level of stratification on the outside and inside of the tow, ozone is diffused into the inside of the tow using a low-temperature glass tube. Therefore, the flow C of air containing ozone in the chamber is in the same direction as the traveling direction of v4;
/l:, From near the entrance of the chimer bar, all the ozone gas was sent into the chamber. , r syn and uniform
Iζ can be taught, and the aromatic treatment can be carried out without unevenness.

Regarding the ozone concentration, it is more efficient to oxidize when the ozone concentration is treated at a concentration of α5 volume or more, preferably 1.0 volume or more.

The roll requires at least 3 or more to install both ends, but there is no limit to the number of chambers, and there is no limit to the number of chambers in one chamber! Three plate rolls may be provided, or two or more chambers may be used as shown in FIG.

However, in terms of equipment costs and workability, it is more efficient to use two chambers.

There are no restrictions on the power supply for energizing, either AC or DC may be used, and the number of power supplies may be one for each chamber, as shown in Figure 1, each power supply can be used for each! It is also possible to allow the current to flow through the tW cool. [Example] Below is an example! 7 This invention will be explained in detail by Maki.

(-fiJ determination method) "The table'is characteristic of the 11 cone of the tiger is
It was measured by the CyclicVO1tammeter7 method shown in the publications No.-246864 and No.60-252718. Cyclic Volta in the present invention
The zmetry method refers to a method of measuring using an analyzer consisting of a potentiostat and a function generator, and carbon fiber as one electrode.

In the present invention, a 54-phosphoric acid aqueous solution is prepared and set to pH II, and dissolved nitrogen is removed by bubbling nitrogen. An Ag/AgC1 electrode is used as a reference electrode, a platinum plate with a sufficient surface area is used as a counter electrode, and a carbon fiber is used as a working electrode for measurement. The potential operation range is -cL2 to αsv'3, and the relocation speed is 2mv/sea.3XYL/
:! - Draw a potential-current curve using a driver, sweep it 5 times or more, and when the curve becomes stable, the I current ff1 for the total potential group $ at +l14v with respect to the Ag/AgC1 layer.
1 was read and Lpa'r was calculated according to the following formula.

The basis weight and density were determined by the method described in J.K. 5-R7601.

"Composite Performance" Using Mitsubishi Rayon %W◆540 Evogi Shinjin, the bending strength (TeS±) in the direction perpendicular to the direction of growth was measured according to A37M D790.

Example 1 50 tows of #9,412 rods with a modulus of elasticity of 24 t/m were run at a speed of 120 s/hr through two furnaces each having a length of 50 mm. During processing, a current of 27 A was passed through each chamber by tilting the end of one side as shown in Figure 1. Air, CF running Mangoku 1 same 7
It was flowed in a 1N basin/hr so that it flowed in the opposite direction.

As a result, one a of carbon Wl before treatment is 11 (tIA
/cN2), but in this process: Lph d(12
3+'pA//cn? ) rose to

Processing, ``@D Composite/4: Noh'' PS Futae s<q/
Atsuyuki in father-in-law 2 did the same as above until I treatment/ko;glo:<・J/section 2.

Furthermore, human bodies came into contact with the carbon fibers before and after treatment with this device, and it was confirmed that the device was completely safe.

Example 2 Surface characteristics (IPA) of tora buns obtained by performing the same treatment as in Example 1 by changing the processing speed and processing current of carbon fibers
When the composite property 3 (Fs±) was measured, the first result was
IS beams shown in the table were obtained.

Table 1 shows a schematic illustration of a suitable apparatus for implementing the present invention with a unique, 1m explanatory diagram.

1...Carbon fiber 2...Electricity, ■ Heat use 1. Extreme roll 5...
Ozone chamber 4 --- Gas D inlet containing ozone 5 ---
Exhaust port 6...TFI for 1 stove 7...Grounding terminal precision scale Applicant: Mitsubishi Rayon Co., Ltd.

Claims (1)

[Scope of Claims] 1. In a surface treatment method for carbon fiber in which the carbon fiber is heat-treated between current-carrying electrodes and passed through air containing ozone between the electrodes, three or more electrodes are used. A carbon fiber surface treatment method characterized by installing the carbon fiber and grounding the electrodes at both ends. 2. The treatment method according to claim 1, further comprising providing two or more chambers into which ozone is blown. 3. In order to ensure that the flow of air containing ozone in the chamber is in the same direction as the running direction of the fibers, air containing ozone is sent into the chamber from near the fiber entrance of the chamber and exhausted from near the fiber exit. The treatment method according to claim 1, characterized in that: 4. The treatment method according to claim 1, characterized in that air having an ozone concentration of 1.0% by volume or more is used. 5. An apparatus for carrying out the treatment method according to claim 1.