JPH031250Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a chlorinated vinyl chloride board (hereinafter referred to as HT-
A PVC board (abbreviated as PVC board) is used as the core material, and one or both sides of the core are hard vinyl chloride boards (hereinafter abbreviated as PVC board).
This invention relates to a hard vinyl chloride composite board (hereinafter referred to as composite board) formed by thermally welding the following: The purpose is to provide a composite board with excellent chemical resistance at high temperatures.

Conventionally, PVC boards have been commonly used as a material for making chemical tanks that require chemical resistance.
Since the thermal deformation temperature of PVC plates is 70 to 75°C, the maximum operating temperature when used as a chemical bath was generally about 60°C. However, in plating tanks, alkaline tanks, etc., the actual operating temperature may rise to around 80℃ depending on the application.
If it was made only from PVC board, it would not have enough strength at that temperature and would undergo thermal deformation, making it unusable.

In addition, a chemical tank made of PVC board and lined with unsaturated polyester resin (hereinafter referred to as FRP) has sufficient strength at the above temperature, but FRP has poor chemical resistance and is used for plating liquid, etc. If it scatters and sticks, the area will be attacked and its strength will decrease, and the chemical solution tank will not be able to maintain its strength, resulting in damage.
Also, due to the difference in linear expansion coefficient between PVC board and FRP,
There was a drawback that both of them peeled off from the laminated surface.

The present invention has been developed in view of the above-mentioned drawbacks, and will be described in detail below with reference to the drawings. 1 is PVC
It is a plate made by ordinary extrusion molding or press molding, and its thickness is 1 to 4 mm from the viewpoint of deterioration during use and chemical resistance, but 1 to 2 mm is the most practical thickness considering cost. It is true. Further, the heat deformation temperature of the PVC board may be 70 to 75°C, similar to normal ones. 2 is an HT-PVC board, the thickness of which varies from 3 to 20 mm depending on the strength required when used at high temperatures.
mm is required, but the most practically suitable is 5 mm.
~15mm. Its heat distortion temperature needs to be 95-100℃ to withstand the operating temperature of 80℃.
The composite plate of the present invention can be obtained by laminating the PVC plates 1 on both sides of such an HT-PVC plate 2 and thermally welding them using a press.

HT-PVC board 2 has a narrower molding temperature range than PVC board 1, so it is difficult to control the temperature, and the board decomposes if the temperature gets too high. However, the molding of the composite board of the present invention Since PVC board 1 is on the surface in contact with the hot plate (the part where the temperature is highest), the HT-
It protects the PVC board 2 and facilitates molding.

The composite board thus obtained uses an HT-PVC board 2 with a thickness of 3 to 20 mm as the core material, and uses a PVC board 1 that is resistant to chemicals on the outer surface.
It will not deform or be attacked by chemicals even if it comes into contact with chemicals at ℃. If the HT-PVC board 2 is thinner than 3 mm, the composite board cannot withstand the operating temperature of 80°C, and if it is 20 mm or more, it will lead to poor formability and a rise in cost. If only one side of the composite plate comes into contact with chemicals, the PVC plate 1 may be thermally welded to only one side of the HT-PVC plate 2.

The composite plate of the present invention is mainly used in plating tanks, pickling tanks, scrubbers, fans, etc. that require high operating temperatures and chemical resistance. An example of this will be explained with respect to the square tank 3 shown in FIG. The size of square tank 3 is 50cm
The size is 100cm x 50cm, and the composite plate is cut into one size and each contact part is welded. Welding was performed as shown in Figure 3 A and B. The welding part 4 is made by diagonally cutting a composite plate, and a PVC welding rod of the same quality is used for the part 41 corresponding to the PVC plate 1, and the HT-PVC
The parts 42 corresponding to the plate 2 are welded using the same HT-PVC welding rod, and the welded part 4 has a triple structure similar to that of the composite plate. Therefore, the strength and chemical resistance of the welded portion 4 are similar to those of the composite plate, and the welded portion 4 is not deformed or damaged. Even when the square tank 3 was used in an iron degreasing tank at a working temperature of 75 to 80°C, no abnormality was observed. In addition, in the square tank 3, on the cut surface of the composite plate
Since the side edge of the HT-PVC plate 2 is exposed and there is a risk that chemicals may adhere to this surface, a PVC strip plate 5 is welded to this area to improve chemical resistance.

As mentioned above, the composite board of the present invention has a thickness of 3 to 20 mm.
Since the PVC plate is thermally welded to one or both sides of the HT-PVC plate, it will not undergo thermal deformation even if it comes into contact with chemicals at high temperatures, nor will it be attacked by chemicals. Also
Since it is a lamination of PVC board and HT-PVC board, which are vinyl chloride boards, they adhere well and their linear expansion coefficients are approximately the same, approximately 7.0×10 ^-5 /°C, so they may peel due to the difference in linear expansion. will not occur. Furthermore, since it is a composite board made of vinyl chloride, it can be freely processed by cutting, bending, welding, etc. Also,
The PVC plate is on the outer surface, where the temperature is highest during heat welding, and has great effects such as protecting the HT-PVC plate and making it easy to mold.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the vinyl chloride board of the present invention, Figure 2
The figure is a partially cutaway perspective view of a square tank made using the same plate as above, and Figure 3 is a cross-sectional view showing the welded state of the same plate. 1 is a hard vinyl chloride board, 2 is a chlorinated vinyl chloride board. It is.

Claims (1)

[Scope of utility model registration request] A hard vinyl chloride composite board made by heat welding a hard vinyl chloride board to one or both sides of a chlorinated vinyl chloride board with a thickness of 3 to 20 mm as the core material.