JPS60105529A - Corrosion-resistant composite pipe or vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a composite tube or container made of fiber-reinforced thermosetting glasstic which is corrosion resistant, especially at high temperatures.

[Prior art]

Pipes or containers made of glass fiber-reinforced thermosetting plastics (FRP) are lightweight and have excellent corrosion resistance, so they are widely used in the chemical industry and other fields. When coming into contact with corrosive gases such as hydrogen or chlorine gas, or corrosive liquids such as hydrofluoric acid, hydrochloric acid, or sulfuric acid, particularly at high temperatures, there is a problem in that the strength or hardness deteriorates and the life span is shortened.

[Purpose of the invention]

The object of the present invention is to provide a composite pipe or container made of fiber-reinforced plastic that has corrosion resistance, especially at high temperatures.

[Structure of the invention]

The present invention is a fiber-reinforced thermosetting plastic composite pipe or container in which a protective I- made of carbon fiber-reinforced thermosetting plastic is provided on the surface that comes into contact with a corrosive substance.

Heat curing of unsaturated polyester resin, etc. using glass fiber as a reinforcing material is used as a material for pipes or containers that require heat and corrosion resistance, such as chemical liquid transport pipes in chemical factories, Fukuokaitai gas ducts, gas stacks, and chemical liquid storage containers. Composite materials with a plastic matrix are used;
Even these composite materials could not be said to have sufficient heat resistance and corrosion resistance. The present inventors have conducted various studies to improve the heat resistance and corrosion resistance of these composite materials;
It has been found that heat resistance and corrosion resistance are significantly improved when a carbon fiber layer is provided on the surface (the surface that comes into contact with corrosive fluid). As a result, it can be used in corrosive environments where fiber-reinforced composites cannot be used, and it also has a longer lifespan than pipes or containers made from glass fiber-reinforced composites that have been used up until now. of products are obtained.

To explain the storage invention based on the drawings, Fig. 1 shows a cross-sectional view of a heat-resistant and corrosion-resistant composite pipe in which a carbon fiber layer is provided on the inner surface of the pipe, and Fig. 2 shows a cross-sectional view of a heat-resistant and corrosion-resistant composite pipe in which a carbon fiber layer is provided on the inner and outer surfaces of the pipe. This figure shows a cross-sectional view of a heat-resistant and corrosion-resistant composite pipe.
indicates a protective layer made of garbon fiber and thermosetting resin,
Reference numeral 2 indicates a composite tube body made of glass fiber and thermosetting resin. Although one ply of carbon fiber layer is sufficiently effective, heat resistance and corrosion resistance are also improved by increasing the number of carbon fiber layers depending on the corrosive environment. Carbon fibers are commercially available, such as trading card mats manufactured by Toshi Co., Ltd. (product number BOO30).
) etc.

Glass fiber can be used as a structural material, depending on the required strength, such as chopped strand mat, loach cloth, glass roving, etc. Also, for the thermosetting resin as a matrix, isophthalic acid-based unsaturated polyester,
Select and use bisphenol-based unsaturated polyester, vinyl ester, etc. depending on the corrosive environment.

These heat-resistant and corrosion-resistant composite tubes can be manufactured in exactly the same manner as the conventional method for manufacturing composite tubes using glass fibers.

That is, after applying resin to the mandrel and impregnating and laminating carbon fiber with a predetermined number of briars, glass fiber (chopped strand mat, roving cloth, glass roving, etc.) is impregnated and laminated as appropriate, and after the resin hardens, the mandrel is pulled out. A heat-resistant and corrosion-resistant composite tube having a carbon fiber layer on the inner surface can be obtained. As the reinforcing material, other than glass fibers, such as asbestos fibers, etc. can also be used. Next, the effects of the present invention will be specifically explained by illustrating an example of the performance test results of a heat-resistant and corrosion-resistant composite pipe having a carbon fiber protective layer on the inner surface.

Example-1 5% sulfuric acid containing a trace amount of hydrogen fluoride was simultaneously applied to a glass fiber composite tube and a composite tube with a carbon layer at 120℃, and the physical properties were compared after one month. As shown in the method, carbon Composite pipes with fiber layers have excellent properties.

The composite pipe has an inner diameter of 102mm, an outer diameter of 114mm, and a thickness of Jl 6.
A carbon layer having a carbon layer thickness of 0.5 mm was used.

Example-2 120 containing soda cyanide, phenol, and ammonia
A mixture of liquids at ℃ was passed through a glass fiber composite tube and a composite tube with a carbon layer at the same time, and the physical properties were compared after one month, and the results showed that the composite tube with a carbon layer had superior properties as in the method. .

The composite tube used had an inner diameter of 10100O, an outer diameter of 1016tm, a thickness of 8mm, and a carbon layer thickness of 0.25mm.

Example-3 A glass fiber composite pipe and a composite pipe with a carbon layer,
pH5,1-4,6 including hydrogen sulfide, chlorine, sulfuric acid mist, etc.
The composite tube with a carbon layer clearly showed superior results as shown in the results of comparing various physical properties after 7 months of use in a waste scum stack at a temperature of 120° C. (May 160° C.).

The composite pipe has an inner diameter of 80 (1+III+) and an outer diameter of 8128 m.
.

) 9- A carbon layer with a tone of 6.4 and a carbon layer thickness of 0.25 mm was used.

Example-4 A composite pipe with a glass fiber composite pipe and a carbon layer is
As a result of using it as a conduit for wet chlorine gas at 0°C for one and a half years, the composite pipe with a carbon layer is superior as shown below.

The composite pipe has an inner diameter of 102mm, an outer diameter of 114m, and a thickness of 6WIj+.
A carbon layer with a thickness of 25 mm was used.

The test results for fiber-reinforced gutstick tubes have been described above, but similar results were obtained when fiber-reinforced plastic was used as the container.

[Brief explanation of drawings]

1 and 2 show cross-sections of a composite pipe provided with a carbon fiber layer according to the present invention. 1...Protective layer made of thermosetting resin on carbon fiber 2...Pipe body made of glass fiber and thermosetting resin Patent applicant Fuji Kako Co., Ltd. Agent Hirotoshi Nakamoto Benjo Shodo Yoshimine Katsura Figure 1 Figure 2

Claims (1)

[Claims] A composite pipe or container made of fiber-reinforced thermosetting plastic, which has a protective layer made of carbon fiber-reinforced thermosetting plastic on the surface that comes into contact with corrosive substances.