JPH0684257B2 - Raw yarn oil for inorganic fiber manufacturing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oil agent attached to a raw yarn for producing an inorganic fiber.

[Prior Art] A representative example of a raw yarn oil agent for producing inorganic fibers is a raw yarn oil agent for producing carbon fibers, which is disclosed in JP-A-49-11724 and JP-B-53.
No. -10175 and Japanese Patent Publication No. 60-43446.
The contents are the troubles when the raw yarn (precursor) for carbon fiber production is infusibilized or flameproofed (fusion between single yarns, fuzz and yarn breakage due to occurrence of mechanical defects on fiber surface)
It is a raw yarn oil agent for carbon fiber production for eliminating carbon and producing carbon fiber having a certain quality performance with high productivity.

Such a raw fiber oil agent for carbon fiber production is a water-based treating agent, and when applied to a raw fiber for inorganic fiber production based on the sol-gel method, the strength of the original raw yarn itself, which is involved in the chemical reaction state of water, deteriorates in strength. There are practical problems.

[Problems to be Solved by the Invention] In the present invention, in the process of producing an inorganic fiber based on the sol-gel method, adhesion between single fibers, fluff, yarn breakage, yarn loosening (disturbance of single fiber focusing), etc. Oil agent to be attached to the raw yarn for inorganic fiber production (hereinafter referred to as raw yarn oil agent or process oil agent), which has the effect of preventing the binding of multiple single fibers and inhibiting the adsorption of water on the fiber surface to suppress the gelling reaction. We have made a thorough study and found out.

That is, an object of the present invention is to have a sizing property and a lubricating property as a process oil agent for a raw yarn for producing an inorganic fiber, moreover, there is no adhesion between single fibers or between the bundled yarns, rewinding is easy, and It is an object of the present invention to provide a raw yarn oil agent which prevents adhesion between single fibers or bundled yarns and blackening of yarns in a sintering process.

Examples of the process of the raw fiber for producing the inorganic fiber include a method of winding the spun raw yarn (hereinafter referred to as a winding method) and a method of depositing the raw yarn in a container (hereinafter referred to as a deposition method). ,
The present invention can be commonly applied to these methods.

[Means for Solving Problems] The present invention has been made to solve the above problems, and includes liquid paraffin having an average carbon number of 18 or more and solid paraffin having an average carbon number of 20 to 50. The present invention provides a raw yarn oil agent for producing an inorganic fiber, which is obtained by mixing

When the raw fiber for producing an inorganic fiber based on the sol-gel method comes into contact with water or an alcohol-based substance, it is unavoidable that the raw material yarn is rapidly polymerized or dissolved to impair the strength or cause fusion or fiber defects. Therefore, it is desired to use non-aqueous and non-alcoholic oil agents.

The main constituent of the oil agent in the present invention is liquid paraffin and / or fixed paraffin, which are non-aqueous and non-alcoholic substances, and has excellent performance as a raw thread oil agent for producing inorganic fibers, especially as a process oil agent for inorganic fibers based on the sol-gel method. Therefore, it has a remarkable effect on prevention of troubles caused by the water and alcohol oils.

Liquid paraffin, which is a component of the oil agent of the present invention, has an easily volatile liquid (having a small molecular weight) mixed in the liquid paraffin when the average carbon number is smaller than 18, which easily causes adhesion between single fibers, In this case, it becomes difficult to use the oil agent.

When the average number of carbon atoms of the solid paraffin, which is a component of the oil agent of the present invention, is less than 20, the solid paraffin does not solidify at room temperature, the filament does not have a good sizing property, and fluff is easily generated, which makes it difficult to unwind the filament. Further, if the average carbon number exceeds 50, unless the amount of the oil agent attached to the raw yarn is considerably reduced, deterioration of the strength of the yarn due to heat generation during sintering cannot be avoided and in this case it becomes difficult to use the oil agent.

Liquid paraffin (A) and fixed paraffin (B) of the present invention
The mixing ratio (A) / (B) is 0/100 to 100/0.
The preferred mixing ratio is slightly different depending on whether the spinning process is the winding method or the deposition method. However, in the winding method, the mixing ratio of 100/0 is not preferable in terms of bunching property, fluff, and unwinding.

The amount of the liquid paraffin and / or solid paraffin of the present invention attached to the raw yarn (as the raw yarn + the attached amount = 100) is 3 to 30.
% Is preferable, and if 3% or less, desired performance cannot be obtained. On the other hand, if it exceeds 30%, it becomes difficult to unwind the yarn, and moreover, the yarn is easily ignited during firing, which not only hinders the firing but also causes deterioration of the strength of the yarn.

[Operation] The raw thread oil agent for producing minerals of the present invention is composed of the liquid paraffin and / or solid paraffin, and it is necessary that the raw thread oil agent is a non-aqueous or non-alcoholic substance. Inevitably, the physical properties of the fiber are deteriorated after the raw yarn is sintered. The raw yarn oil agent for producing inorganic fibers of the present invention is non-aqueous and non-alcoholic. Such a raw yarn oil agent is excellent in solution stability and attachment uniformity with respect to the raw yarn, and is characterized in that it prevents the occurrence of adhesion between single fibers after the attachment treatment to the raw yarn and after the sintering treatment. Further, the liquid paraffin of the present invention is excellent in lubricity, the solid paraffin is further excellent in focusing property, and since the liquid paraffin and the solid paraffin are not soluble in each other, they act independently to produce the effect of respectively protecting the raw yarn. it is conceivable that.

As the method of using the oil agent of the present invention, when liquid paraffin or solid paraffin is used alone, it is used by directly adhering it to the raw yarn in a liquid state. When the liquid paraffin and the solid paraffin are mixed and used, the solid paraffin is heated and melted and mixed with the liquid paraffin with stirring before use. The method of attaching the oil agent of the present invention to the raw yarn is illustrated in FIGS. 1 (1) to (5). That is, FIG. 1 (1) Spray system, (2) Roller system, (3) Shoe system, (4) Belt roller system,
(5) It is a dip method.

In the figure, 1 is an inorganic fiber such as quartz glass fiber immediately after spinning. In the case of quartz glass fiber by sol-gel direct spinning method, metal alcoholate (ethyl silicate, methyl silicate, etc.) is hydrolyzed and polymerized by using acid or alkali as a catalyst. Make a sol liquid mainly composed of chain polymer like this, and when the viscosity becomes appropriate (10 to 1,000 poise), sol liquid is extruded from the nozzle and spun to make gel fiber. This corresponds to the above-mentioned quartz glass fiber immediately after spinning. Since the tensile strength of the fiber in this state is low, it is heat-treated for several minutes to several hours to a temperature of about 700 to 1300 ° C. to volatilize residual carbon and fire it to obtain a high-strength quartz glass fiber. The gel fiber immediately after spinning moves to the next step after applying the oil agent of the present invention,
Alternatively, if necessary, it is wound up or deposited in a container, further unwound, and moved to the next step.

[Example] Liquid paraffin having an average carbon number of 20 (AI), average carbon number
Gel fiber immediately after spinning was prepared by mixing 30 liquid paraffin (A-II), solid paraffin having an average carbon number of 22 (BI) and solid paraffin having an average carbon number of 24 (B-II) at the ratio shown in Table 1. Attached to. Regarding the evaluation, the sizing property, the presence or absence of fluff, the ease of rewinding, and the adhesion between single fibers before and after sintering were shown.

[Effects of the Invention] The present invention is a process oil agent applied to a raw yarn for producing inorganic fibers, which has the effect of making the bundle of single fibers good, while also having lubricity, causing yarn breakage and fluffing. It has the effect of suppressing the unwinding of the yarn and further preventing the fibers from adhering before and after sintering. It also has the effect of inhibiting the adsorption of water on the fiber surface and suppressing the gelation reaction caused thereby.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing a method for adhering a raw yarn oil agent to an inorganic fiber, which is (1) a spray method, (2) a roller method,
(3) Shoe system, (4) Belt roller system, (5)
It is a dip method. 1 ... Inorganic fiber, 2 ... Raw yarn oil agent 3 ... Spray device, 4 ... Roller 5 ... Shoe, 6 ... Raw yarn oil agent supply guide 7 ... Belt

Claims (3)

[Claims] 1. A raw yarn oil agent for producing an inorganic fiber, which is prepared by mixing liquid paraffin having an average carbon number of 18 or more and solid paraffin having an average carbon number of 20 to 50. 2. The inorganic fiber is an inorganic fiber based on a sol-gel direct spinning method.
A raw yarn oil agent for producing an inorganic fiber according to the item. 3. The raw yarn oil agent for producing an inorganic fiber according to claim 1, wherein the inorganic fiber is a quartz glass fiber based on a sol-gel direct spinning method.