JPS63116845A - Sheet material for expansion joint - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sheet for expansion joints used in joints of smoke ducts, ducts, piping, etc.

[Conventional technology/problems] Expansion joints are used to absorb distortion and vibration caused by heat in ducts, piping equipment, etc., and are used in various plants,
It is essential for equipment.

Conventionally, expansion joints used for these purposes have mainly been made of metal, but in recent years, expansion joints have been used in locations with relatively severe usage conditions, such as pollution-related equipment and waste treatment equipment. In place of metal expansion joints, which have a small amount of displacement absorption and are difficult to absorb displacement in multiple directions, flexible joints using sheet materials with a base fabric that have a large amount of displacement absorption and loss are widely adopted. It's starting to happen.

These sheet materials usually have a thickness of 0.1 to 1. Tetrafluoroethylene resin with a thickness of On++a and a thickness of 0.5 to 3. A perfluoroalkoxy resin film or a tetrafluoroethylene-hexafluoropropylene copolymer resin film with a thickness of 0.01 to 0.05 nuo is sandwiched between the OI asbestos cloth, and 3
It can be obtained by pressure bonding at a temperature of 30 to 350°C for several hours.

Excellent bending resistance for a cloth used as a base fabric,
Asbestos cloth, which is acid-resistant and heat-resistant, is the best choice, and is still widely used today. However, due to the problem of asbestos pollution in recent years, glass cloth is being used instead of asbestos cloth. The glass cloth currently being used experimentally is an untreated cloth with an E-glass composition, and although it has the same heat resistance as asbestos cloth, it is inferior in bending resistance and acid resistance. When a sheet material with a cloth as a base fabric is used as a material with a length of 11 m, problems such as holes and cracks in the glass cloth occur due to repeated expansion and contraction over a long period of time, resulting in poor durability.

The purpose of the present invention is to solve the drawbacks of the bending resistance and acid resistance of conventional sheet materials based on glass cloth, and to achieve durability equivalent to or higher than sheet materials based on asbestos cloth. It is applied to sheet materials used as cloth.

Means for Solving the L Problem] The present invention provides a polytetrafluoroethylene resin sheet, an untreated glass cloth having a C glass composition, and a C glass treated with a treatment liquid containing a fluorine resin and/or a silicone resin as the main components. A perfluoroalkoxy resin film or a tetrafluoroethylene-hexafluoropropylene copolymer resin film is placed between the glass cloth having the composition or the glass cloth having the E glass composition, and the glass cloth is thermocompression bonded to the tetrafluoroethylene resin sheet. To provide a sheet material for expansion joints made of

Function] The sheet material for expansion joints of the present invention is a substitute for the ordinary untreated glass cloth of E glass composition that is used in place of asbestos cloth, and is a substitute for untreated glass cloth of C glass composition, fluorine resin and/or Or glass cloth of C glass composition treated with a treatment liquid mainly composed of silicone resin or E
The above-mentioned problems are solved by using a glass cloth having a glass composition.

Typical C glass compositions and E glass compositions are described below: (Overlapping %) It is said that the C glass composition has good acid resistance, and the E glass composition has good electrical insulation.

For the sheet material for expansion joints of the present invention, a glass cloth having a C glass composition may be used as it is, or a glass cloth having a C glass composition or a glass cloth having an E glass composition may be made of a fluororesin and/or a silicone resin as a main component. Glass cloth treated with a treatment solution can be used.

Here, the "processing liquid containing a fluororesin and/or silicone resin as a main component" described in this document a refers to a treatment liquid consisting of a fluororesin and/or silicone resin or a fluororesin and/or It should be understood that the term includes a treatment liquid made by adding and blending the below-mentioned subcomponents to a silicone resin.

Fluorine-based resins that can be used in the treatment liquid for treating glass cloth with C glass composition or E glass composition include tetrafluoroethylene resins, perfluoroalkoxy resins, tetrafluoroethylene-hexafluoropropylene copolymer resins, and fluorocarbon resins. Examples include vinylidene chloride resin. Examples of the silicone resin include diphenyl silicone resin, diethyl silicone resin, dimethyl silicone resin, methylphenyl silicone resin, and ethylphenyl silicone resin. Although either a water emulsion or a solution of these resins (main components) can be used, it is preferable to use a water emulsion from the viewpoint of cost, explosion protection, etc.

In addition, when introducing subcomponents into the treatment solution, one or more components selected from the following three components are usually used: ■ carbon black or graphite, ■ softeners or penetrants, and ■ titanium coupling agents or silane coupling agents. .

In addition, as the above-mentioned softener, a silicone resin is preferable, and as the penetrant, a surfactant is preferable.

The concentration of the main component (fluororesin and/or silicone resin) and subcomponents in the processing solution is usually 50% or more by weight of the main component.
, the subcomponent content is less than 50% by weight.

The treatment solution having the above composition was thoroughly stirred, impregnated with glass cloth, squeezed with a roller, and then heated for 15 minutes.
The glass cloth can be treated by drying it at a temperature of 0° C. or higher for 1 minute or more.

When processing a glass cloth of C glass composition or E glass composition using the conditions and operating methods as described above,
The adhesion rate of the fluororesin and/or silicone resin to the glass cloth is 50% or less, preferably 1 to 10%, based on the mass of the glass cloth in the case of C glass composition;
In the case of glass composition, 0.3 to the mass of glass cloth
-50%, preferably 1-10%. In addition, the adhesion rate of the subcomponent to the glass cloth is preferably equal to or lower than that of the main component,
The optimal amount is 80% by weight or less of the main component.

Such treatment significantly improves the bending resistance and acid resistance of the glass cloth. Moreover, when subcomponents are present, their performance can be further improved.

Note that before the glass cloth having the C glass composition or the E glass composition is subjected to the treatment, the glass cloth may be subjected to pretreatment such as heat cleaning or caramelizing.

Further, the glass yarn constituting the glass cloth having a C glass composition or the glass cloth having an E glass composition used in the sheet material for expansion joints of the present invention can be either a filament type or a bulky type. Glass cloth using type yarn is preferable because it has slightly better bending resistance.

The sheet material for expansion joints of the present invention is usually 0.1 to 1.0 m+
Tetrafluoroethylene resin with a thickness of s and a normal thickness of 0.5 to 3
．． Between the untreated glass cloth of C glass composition of 0 mm or the glass cloth of C glass composition or E glass composition obtained by the above-mentioned treatment, the thickness is usually 0.01 to 0.
．． It can be produced by sandwiching a 0.5 m-perfluoroalkoxy resin film or a tetrafluoroethylene-hexafluoropropylene copolymer resin film and pressing the film at a temperature of 330 to 350°C for several minutes to several hours.

Next, the sheet material I for expansion joints of the present invention will be explained with reference to the drawings. Figure 0 is an example of a cross-sectional view of the sheet material for expansion joints of the present invention before crimping. 1) and glass yarn warp (3 yarns) and glass yarn weft (4 yarns)
) A perfluoroalkoxy resin film or a tetrafluoroethylene-hexafluoropropylene copolymer resin film (2) is placed between the glass cloths.

The present invention will be further explained with reference to Examples (hereinafter simply referred to as "examples" unless otherwise specified).

``Den'' - A basket weave glass cloth woven by weaving 600g of bulky glass yarn of E-glass composition per 1000m into 20 yarns in the warp and 16 yarns in the width per 25111ml, was woven with tetrafluoroethylene resin emuldimine (60% by weight). ) 170g/l,
Carbon black 301F/1 and titanium lactate 13g/
1 was immersed in a treatment bath mixed with
Dry for a minute. The solid content adhesion rate to the glass cloth at this time was 6.0% (main component 4.5%, subcomponent 1.5%), and the thickness of the obtained glass cloth treated product was 1.2011%.
It was 1.

A tetrafluoroethylene-hexafluoropropylene copolymer resin film with a thickness of 0.025 mm was sandwiched between this glass cloth and a tetrafluoroethylene resin sheet with a thickness of 0.40+nI++, and the film was heated at a temperature of 340°C for 10 Crimp for 1 minute to get a thickness of 1
．． A 6 mm sheet material for an expansion joint was obtained.

600 per 1000m A basket weave glass cloth woven by weaving bulky glass yarns of E-glass composition into 20 vertical and 16 horizontal yarns per 25 mm was woven with methylphenyl silicone resin emulsion (35% by weight) 90FI/1,
Graphite 2og/l and softener (silicon resin)
After immersing in a treatment bath containing 4g/l”tx-mix, squeezing.
It was dried at 240°C for 3 minutes.

At this time, the solid content adhesion rate to the glass cloth was 1.8% (
The main component was 1.0% and the subcomponent was 0.8%), and the thickness of the obtained glass cloth-treated product was 1.2 mm.

A 0.025 mm thick tetrafluoroethylene-hexafluoropropylene copolymer resin film was sandwiched between this glass cloth and a 0.40 mm thick tetrafluoroethylene resin sheet, and the film was pressed for 10 minutes at a temperature of 340°C. thickness 1.6m11
A sheet material for expansion joints was obtained.

Takumi-1 A woven glass cloth made by weaving bulky glass yarns of 600y per 1000m of E-glass composition into 20 pieces per 25mm in the warp and 16 pieces in the width, is made of tetrafluoroethylene-hexafluoropropylene copolymer. After immersing in a treatment bath consisting of resin emulsion (50 weight weight) 2049#, squeezing,
It was dried at 240°C for 3 minutes. The solid content adhesion rate to the glass cloth at this time was 4.6%, and the thickness of the obtained glass cloth treated product was 1.2+++i.

A 0.025 mm thick tetrafluoroethylene-hexafluoropropylene copolymer resin film was sandwiched between this glass cloth and a 0.40+++m thick tetrafluoroethylene resin sheet, and they were pressed together at a temperature of 340°C for 10 minutes. and thickness 1.6
A sheet material for expansion joint No. 1 was obtained.

The same treatment as in Example 1 was applied to a basket weave glass cloth woven by placing 600 g of bulky glass yarn of C glass composition per 1000 m of λ-branch, 25 yarns in the warp and 16 yarns in the width, per 25+am+. At this time, the solid content adhesion rate to the glass cloth was 6.1% (main component 4.6%, subcomponent 1.5%),
The thickness of the obtained glass cloth treated product was 1.211II1
It was 1.

A tetrafluoroethylene-hexafluoropropylene copolymer resin film with a thickness of 0.025 mm+ is sandwiched between this glass cloth and a tetrafluoroethylene resin sheet with a thickness of 0.40 a+, and pressure bonded for 10 minutes at a temperature of 340°C. thickness 1.5a
+m sheet material for expansion joints was obtained.

Untreated glass cloth with C glass composition similar to Example 4 (
A sheet material for an expansion joint with a thickness of 1.5 au+ was obtained by the same thermocompression bonding operation as in Example 4 using a material with a thickness of 1.1++n).

Untreated crow cloth with E glass composition similar to Le Shu J Law Example 1 (
J Sosa 1. , II), a sheet material having a thickness of 1.5+II m was obtained by the same thermocompression bonding operation as in Example 1.

"Hi" L doctor 3 asbestos cloth, made by Heiwa Asbestos Co., Ltd., 4A grade, thickness 2.0n
n] to a thickness of 2 by the same thermocompression operation as in Example 1.
．． A sheet material of 3n+I++ was obtained.

Table 1 below lists the performance values of the expansion joint sheet materials obtained in Examples 1 to 5 and the sheet materials obtained in Comparative Examples 1 to 2.

[Effects of the invention] The sheet material for expansion joints of the present invention has bending resistance, acid resistance, and heat resistance equivalent to or higher than that of currently used asbestos cloth-based sheet materials, and , asbestos pollution, etc., and can withstand long-term use as a sheet material for expansion joints in various plants and equipment.

[Brief explanation of the drawing]

The figure is a cross-sectional view of the sheet material for expansion joints of the present invention before crimping.
In Figure 0, which is a diagram showing an example: 1... Tetrafluoroethylene resin sheet, 2... Perfluoroalkoxy resin film or tetrafluoroethylene-hexafluoropropylene copolymer resin film, 3... Glass Yarn warp, 4...
・Glass yarn weft.

Claims (1)

[Claims] Between a tetrafluoroethylene resin sheet and an untreated glass cloth with a C glass composition, a glass cloth with a C glass composition, or a glass cloth with an E glass composition treated with a treatment liquid containing a fluorine resin and/or a silicone resin as a main component. A perfluoroalkoxy resin film or a tetrafluoroethylene-hexafluoropropylene copolymer resin film is placed on the
A sheet material for expansion joints made by thermally bonding glass cloth to a polytetrafluoroethylene resin sheet.