JPS6037223B2 - Surface treated inorganic fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to surface-treated inorganic fibers, and its object is to provide surface-treated inorganic fibers that have high strength and less mechanical deterioration.

In general, inorganic (vitreous) fibers such as glass wool and rock wool have very high tensile strength (200 to 300 k9/ground) unless mechanically damaged after melt spinning.

In order to avoid this mechanical surface damage, for example, with respect to long glass fibers, various resin films called sizing agents are uniformly applied to the fiber surfaces. However, glass wool
The surface treatment for inorganic short fibers such as rock wool during cotton manufacturing is limited to spraying a binder, and it is not possible to form a uniform film on the fiber surface, resulting in a significant decrease in strength due to mechanical contact. The present invention aims to overcome these conventional drawbacks and will be described in detail below.

. In the present invention, first, the general formula is Ti(OR) on the outer periphery of the inorganic fiber.
) 4: Coating a film of an amorphous titanium compound with an organic titanium compound represented by [R = C3 day 7, C4 day 9],
Furthermore, its outer periphery is coated with a film of fatty acid ester. In coating with these films, first, a protective film of an amorphous titanium compound is uniformly applied to the surface of inorganic short fibers such as glass wool and rock wool that are made into fibers in large quantities by the disk method, spraying method, etc. It is formed to have sufficient thickness, and then a lubricating film of fatty acid ester is further attached or adsorbed. To be more specific, glass wool,
Inorganic short fibers such as rock wool have a weight of 1300 to 1500.
A mineral raw material molten at a high temperature of qC is introduced onto a disk rotating at high speed, and the centrifugal force causes it to become fibers from around the disk, or it is blown away by a high-speed air stream or flame ejected from a nozzle to form fibers. In the present invention, the loosely deposited inorganic fibers carried by the transporting air flow are fed into the surface treatment tank as they are (without applying a large external force). In the treatment tank, organic titanium compounds (Ti(OR)4, R=C3 days 7, C4 days 9
) is ejected from a nozzle onto the inorganic fibers, and water vapor is similarly ejected from another nozzle at the same time. These treatment vapors and water vapor are mixed with each other near the surface of the inorganic fiber before reaching the fiber surface. At this time, on the fiber surface, the organic titanium compound is easily hydrolyzed and condensed to uniformly form an amorphous titanium compound film on the entire surface of the fiber. Unlike the dispersion of droplets using a spray method, this method is a gas phase treatment, so that sufficient steam can reach even the narrow gaps between fibers, allowing a film to be formed on all fiber surfaces. This method further improves CV
D (Chemical Vapor Depositio)
Unlike the method n), since the treatment time can be set arbitrarily, a sufficient film can be obtained.

However, in this process, dry air, N2 gas, or the like is used as a carrier gas for the process vapor. In this case, it is desirable to use a gas from which moisture has been removed as much as possible. Furthermore, various experiments have revealed that the hardness, adhesion, and surface condition of the film obtained by this treatment vary depending on the treatment conditions. That is, surface treatment atmosphere temperature, treatment vapor concentration,
Concentration ratio of treated steam and water vapor [ZO/Ti(OR)4],
It has become clear that the rate at which processing steam passes through the fibers has a significant effect. Although the present invention does not limit the treatment conditions when performing steam treatment, it is desirable that the surface treatment atmosphere temperature is 200° C. or higher. Next, the fibers subjected to the above treatment are brought into contact with fatty acid ester vapor to form a fatty acid ester film on the amorphous titanium compound film.

As the fatty acid ester, esters of fatty acids having 4 to 24 carbon atoms are desirable, and a single type or a mixture of a plurality of types may be used. In the treatment method, fatty acid esters are vaporized by heating, and by exposing the fibers on which the titanium compound film has been formed to the vapor, the vapor can easily condense on the fiber surface to form a uniform film. Here, the fatty acid ester single or mixed film has good compatibility with the organic group of the titanium compound (1OR, R=C3, C74) formed below, and can form a lubricating film with strong adhesion. . In the present invention, as described above, an amorphous titanium compound in which an organic titanium compound represented by the general formula Tj(OR)4; [R=C3day7C4day9] is hydrolyzed and condensed on the outer periphery of an inorganic fiber. This film protects the inorganic fibers from surface damage, making it possible to obtain high-strength fibers that maintain a large initial strength.Moreover, the outer periphery of this titanium compound film is further coated with fatty acid ester. Since the fibers are coated with a lubricating film, the friction between the fibers is further reduced, mechanical deterioration is small, and high strength can be stably maintained over a long period of time.

Furthermore, when the surface-treated inorganic fibers of the present invention are dispersed in water, they have the advantage that dispersion is extremely easy due to the hydrophilic nature of the fatty acid ester. The present invention will be specifically described below based on examples.

[Example 1] Si02 4%, Ca0 4%, River 20315
150,000 wt%, mineral material consisting of Mg0 5%
The molten material was made into cotton under the conditions of a cotton-making disk with a diameter of 200 mm, a rotation speed of 300 pm, and a throughput of 0.4 t/hour, and deposited loosely in a cotton collecting box. Insert the wool into the surface treatment tank, and apply the following treatment materials, millet air and water vapor, to the wool using separate nozzles at a predetermined concentration ratio as carrier gas (
It was sprayed simultaneously with N2).

<Processing conditions> - Processing material...tetrabutoxytitanium [Ti(nOBu)4] - Processing material vapor concentration...700-100 Pm
Flow rate: 30/min [including carrier gas (N2)]
・Water vapor concentration...700 to 200 plates Pm Flow rate...20
evening/minute [including carrier gas (N2)] ・Processing material steam temperature...250 pm ・Steam temperature...250 pm ・Ambient temperature inside the processing tank...25000 ・Processing time... - The fibers treated under the above conditions for 2 minutes were kept on a butyl stearate bath heated to 200q0 and exposed to butyl stearate vapor for 1 minute.

This fiber is called A. [Example 2] Fibers treated with tetrabutoxytitanium in the same manner as in Example 1 were kept on a butyl laurate bath heated to 14,000 ℃ and exposed to butyl laurate vapor for 1 minute.

This fiber is called B. [Example 3] Fibers treated with tetrabutoxytitanium in the same manner as in Example 1 were kept on a chassis oil bath heated to 18,000 ℃ and exposed to chassis oil vapor for 1 minute.

This fiber is called C. The results of measuring the tensile strength of the treated fibers obtained in Examples 1 to 3 are shown in the table below.

The diameter of the short fibers used was 10 to 20 mm. In addition, the method of mechanical forced deterioration was as follows: 4 tons of wool was placed in a tank filled with water (at room temperature) for 2 nights, and the fibers were brought into contact with each other by lighting them at a constant speed with a rotary blade. Thereafter, the fibers were dried in a 40q○ dryer and then subjected to tensile measurement. However, in the above table, the strength measurement conditions were as follows. Tensile speed: 5 legs/min Span length: 1 proboscis Number of samples: 40 each

Claims (1)

[Claims] 1. The general formula is Ti(OR)_4 on the outer periphery of the inorganic fiber; [
R=C_3H_7, C_4H_9] is coated with a film of an amorphous titanium compound obtained by hydrolysis and condensation, and a lubricating film of fatty acid ester is coated on the outer periphery of the film. fiber.