JPH07207473A - Molding having rust preventing effect - Google Patents

Abstract

PURPOSE:To give excellent formability, handling property, storage property and efficient rust preventing effect by welding and fixing vitreous particles having slow releasing property in a point contact state on a two-layer composite fiber comprising a fiber coated with thermoplastic resin which softens at low temp. CONSTITUTION:The double-layer composite fiber 1 consists of two kinds of polyolefinic hot-melt type synthetic resins. The center layer is a polypropylene resin fiber 2 having 0.05-0.5mm diameter. The outer layer is a coating film 3 of a thermoplastic polyethylene resin which softens at a lower temp. than the fiber 2 of the center layer. Vitreous particles having slow releasing property are welded to the outer surface of the two-layer composite fiber 1 by using the thermoplastic resin film 3 as a binder. The particles are fixed in a point contact state to the fiber while the surface of particles is exposed. The vitreous particles 4 having slow releasing property dissolve in an aq. soln. to give a rust preventing effect. B2O3-Na2O-SiO2 soluble glass is used for the particles. The particle size is preferably 30-100 mesh size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded article having a rust-preventing effect capable of efficiently eluting a glassy particle component having a sustained release property.

[0002]

2. Description of the Related Art A molded article having an anticorrosive effect is obtained by, for example, allowing a solid granular material to stand in a liquid channel or immersing it in a water-permeable bag-shaped container. , Refers to those in which an active ingredient that causes dissolution of a solid and exerts an anticorrosive effect is continuously eluted in a solution.

However, when the conventional solid granular material is allowed to stand still, it can be placed only in a flat and slow flow rate, the installation place is extremely limited, and it is difficult to install and collect the granular material. There was a problem. On the other hand, when it is put in a bag-shaped container etc., the water flow resistance inside the container is large and the flow of the solution becomes poor, and the granular materials come into contact with each other to form one lump and the elution efficiency of the particle components decreases There was a problem to do.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and can be installed in any place without the restriction of the place of installation. For the purpose of providing a molded product having a rust-preventing effect, which enables stable and continuous elution, and also exhibits excellent effects such as moldability, handleability, and storability. It has been completed.

[0005]

[Means for Solving the Problems] A molded article having the rust preventive effect of the present invention, which has been made to solve the above-mentioned problems, has a thermoplastic resin film which is softened at a low temperature formed on the outer surface of a fibrous body. The glassy particles having a sustained release property are fixed in a point contact state by heat fusion on the two-layered composite fiber.

[0006]

With this structure, the outer layer of the two-layer composite fiber is formed of a thermoplastic resin coating that softens at low temperature, and glassy particles having sustained release properties are heated on the resin coating. Since they are fused, no adhesive such as a binder is required for fixing the glassy particles having a sustained release property at all, and the fixing process can be performed very easily. In addition, since the above-mentioned vitreous particles having a sustained release property are fixed on the two-layer composite fiber in a state of point contact to expose most of the outer surface of the particles, elution of rust preventive components is stable and sufficient. You can do it.

The present invention will be described in detail below with reference to the drawings. In the figure, 1 is a two-layer composite fiber composed of two kinds of polyolefin-based heat-fusible synthetic resins, and the center layer of the two-layer composite fiber 1 is composed of a polypropylene resin or the like having a diameter of about 0.05 to 0.5 mm. On the other hand, the outer layer is composed of a thermoplastic resin coating 3 made of, for example, a polyethylene resin or the like that softens at a lower temperature than the fibrous body 2.

On the outer surface of the two-layer composite fiber 1, glass particles 4 having a sustained release property use the thermoplastic resin coating 3 as a binder, and by heat fusion of the particles, the particles 4 are outside the particles. It is fixed by exposing most of the surface. The vitreous particles 4 having the sustained release property are gradually eluted in an aqueous solution to exhibit a rust preventive effect.
B ₂ O ₃ —Na ₂ O—SiO ₂ system soluble glass is used. The particle size of the vitreous particles 4 having a sustained release property is 2
It is preferable that the average particle diameter is about 30 to 100 mesh because it is necessary to make the particles evenly adhere to the outer surface of the layer composite fiber 1.

[0009]

【Example】

(Example 1) A. Preparation of glassy particles having sustained-release property B ₂ O ₃ : 65%: Na ₂ O: 10%, SiO ₂ : 20
%: CaO: 5% by weight, a composition prepared by mixing raw materials is heated and melted, and then cooled and crushed and classified to 40% by weight of 40 to 60 mesh particles and 60% by weight of 60 to 80 mesh particles. Glassy particles having a sustained release property were obtained. B. Preparation of 2-layer composite fiber A PP / PE composite fiber whose center is made of polypropylene resin and whose outer surface is made of polyethylene resin is stretched to have a diameter of 0.1 mm and a length of 20-30 mm. Fiber was obtained. C. Preparation of molded body In a weight ratio, glassy particles having a sustained release property: two-layer composite fiber = 20: 1 were mixed, and 540 g was put in a cylindrical container having a capacity of 400 ml, and then 0.3 ~ 0.
It heated at 120 degreeC for 30 minutes, pressurizing at 4 atmospheres, and obtained the cylindrical molded object. A cylindrical molded body obtained by mixing glass particles having the same sustained-release property and nylon resin powder at a weight ratio of 10: 1 and heating at 180 ° C. for 30 minutes in the same manner,
And as a comparative example a simple glass particles having a sustained release,
The following component elution measurements were performed.

The change in the concentration of the solid component after 24 hours of immersion in water by the static method was measured, and the results are shown in Table 1. The excellent sustained release of the present invention was confirmed.

[0011]

[Table 1]

Table 2 shows the results of measuring the change in the concentration of the solid component by the running water method of immersing in running water flowing at a flow rate of 100 ml / min.

[0013]

[Table 2]

Table 3 shows the results of measuring the change in the concentration of the solid component by the flowing water method incorporated in a closed water channel having a volume of 5 liters.

[0015]

[Table 3]

(Example 2) As in Example 1, a polyolefin-based fusible composite fiber was used, and the particle size distribution was 1 on its surface.
50-250 μm: 22.1%, 250-500 μm:
A cartridge as shown in FIG. 3 was prepared by using glass particles having a sustained release property of 77.9% and fixed, and the cartridge was cooled with water in an injection molding die as shown in FIG. As a result of investigating the occurrence of rust and decay of cooling water by arranging it in A between the temperature controller of the closed system cooling water channel in the system and the mold (it may be B between the mold and the cushion tank), the molding start It was confirmed that rust and decay did not occur even after 1 week. The structure of the cartridge is such that the molded body 12 according to the present invention is filled between the primary filtration layer 10 and the secondary filtration layer 11, and the outer surface is covered with the protective net 13.

(Embodiment 3) A cartridge similar to that of Embodiment 2 is used to perform grinding of a closed system in a processing machine 14 as shown in FIG. 5 and filtration of a processing liquid to prevent rust and decay of the liquid. As a result of investigating the occurrence, rust was found even one week after the start of molding.
And it was confirmed that there was no occurrence of decay.

[0018]

As is apparent from the above description, the present invention can be installed in any place without restriction of the place of installation, and the elution of the glassy particle component is stable and continuous. It can be carried out efficiently and can also exhibit excellent effects in terms of moldability, handleability, storability and the like. Therefore, the present invention is extremely large in that it contributes to the development of the industry as a molded product having a rust preventive effect that eliminates the conventional problems.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing another example in which a fixed state of glass particles having a sustained release property is different.

FIG. 3 is a cutaway front view showing a cartridge molded using the present invention.

FIG. 4 is a schematic flow diagram of an apparatus when the present invention is applied to a water cooling system of a mold.

FIG. 5 is a schematic flow diagram of an apparatus when the present invention is applied to a processing machine.

[Explanation of symbols]

 Reference Signs List 1 2 layer composite fiber 2 fibrous body 3 resin coating 4 glassy particles having sustained release property

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoshi Nonoyama 1304 Nakatsuyashiki, Haruki, Togo-cho, Aichi-gun, Aichi Prefecture

Claims (2)

[Claims] 1. A two-layer composite fiber in which a thermoplastic resin coating (3) which softens at a low temperature is formed on the outer surface of a fibrous body (2).
(1) A molded product having an anticorrosive effect, which is characterized in that glassy particles (4) having a sustained release property are fixed on the above in a point contact state by heat fusion. 2. The molded product having a rust preventive effect according to claim 1, wherein the fibrous body (2) is made of polypropylene resin and the resin coating (3) is made of polyethylene resin.