JPH01146042A - Earthquakeproof slide gear - Google Patents

Abstract

PURPOSE: To improve the base isolation performance by mounting a ethylene tetrafluoride resin-contained plate on one of sliding surfaces and mounting a metallic plate ccated with a fluorine-contained polymer including a functional group, organopolysiloxane or their mixture on the other side. CONSTITUTION: An ethylene tetrafluoride resin-contained plate 3 is mounted on one of sliding surfaces in a base isolation sliding bearing 1, and a metallic plate 4 coated with a fluorine-contained polymer having a functional group at least one end, organopolysiloxane or their mixture, is mounted on the other side. The molecule of ethylene tetrafluoride resin is easily oriented in the sliding direction, and partially transited to a counter-surface to form a film, whereby the ethylene tetrafluoride resins are slided to one another, which lowers the friction factor between the contained plate 3 and the metallic plate 4, and improves the base isolation performance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a seismic isolation sliding device that reduces the horizontal force caused by earthquakes that acts on structures such as buildings and towers.

[Conventional technology]

Seismic isolation is the method of reducing the seismic force applied to a building. Currently, the mainstream seismic isolation method is the ``basic isolation type,'' which installs a device between the foundation and the building to reduce earthquake input to the building. There is a sliding seismic isolation device that combines a bearing 1 and a horizontal spring 2. A tetrafluoroethylene resin-containing plate (hereinafter abbreviated as PTFE-containing plate) 3 is pasted on the foundation footing of the sliding bearing 1, and the temporary and pillar The metal plate 4 attached to the metal plate 4 is slid on the metal plate 4 attached to the In other words, when a building slides in response to the horizontal vibration of the ground caused by an earthquake, a force greater than the frictional force acting on the sliding surface is applied to the building, and the horizontal spring 2 is used to prevent the building from moving significantly. It regulates the scope. therefore,
The smaller the friction coefficient of the sliding surface, the greater the seismic isolation effect, and a stable friction coefficient is required to reliably exhibit the seismic isolation effect.

-a) It is said that the coefficient of friction of tetrafluoroethylene resin is small, but the mechanism that shows the low coefficient of friction is that the molecules of the polytetrafluoroethylene resin are easily oriented in the sliding direction, and the friction coefficient of the polytetrafluoroethylene resin is easily aligned with the opposing surface. It is said that this is because the polytetrafluoroethylene resin undergoes partial transition and forms a film, causing the tetrafluoroethylene resin to slide against each other. This is supported by the fact that the slippage of tetrafluoroethylene resin is in the very early stages.
It is known that there is a large difference between the state and the state after orientation. Furthermore, even in the case of sliding between the PTFE-containing plate and the metal plate in the conventional technique, a stable sliding seismic isolation effect has not been obtained because the very initial coefficient of friction is large.

In addition, in order to obtain a large seismic isolation effect due to a lower coefficient of friction, the sliding mating material of the PTFE-containing plate is made of the same PTF.
Attempts were also made to use E-containing material, but the initial friction coefficient was too large, making it impossible to obtain a stable sliding seismic isolation effect.

Furthermore, attempts have been made to add lubricating oil such as grease or oil to the sliding surface, and although it was possible to lower the initial coefficient of friction, the lubricating oil was discharged from the sliding surface after a short period of sliding. In addition, the viscosity changes greatly with temperature, making it impossible to obtain a stable seismic isolation effect. Furthermore, there remains a concern about solidification or deterioration over time.

[Problem that the invention seeks to solve]

As described above, the conventional technology has a problem in that a sliding seismic isolation device having stable and excellent sliding characteristics has not yet been developed.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention uses a PTFE-containing plate on one side of the sliding surface that causes sliding during seismic isolation, and uses a fluorine-containing polymer plate having a functional group on at least one end on the other side. This method employs a means of forming a sliding seismic isolation device using a metal plate coated with a chair or a mixture of organopolysiloxane or a combination thereof. The details will be described below.

First, the organopolysiloxane having a functional group in the present invention is a homopolymer or a copolymer of two or more siloxanes such as dimethylsiloxane, methylphenylsiloxane, trimethylfluoropropylsiloxane, etc., in which a functional group is introduced. The functional groups include, for example, an epoxy group, an amino group, a carboxyl group, a hydroxyl group, a mercapto group, an isocyanate group, a cyanate group, a vinyl group, an alkoxyl group, an alkoxycarbonyl group, and the like. Note that it is desirable that the vinyl group-containing polysiloxane is used in combination with a silicon-bonded hydrogen-containing polysiloxane.

Specific examples of introducing these functional groups are as follows, but the examples for each functional group are not limited to those described.

Those containing epoxy groups, those containing amino groups, those containing carboxyl groups, those containing alcoholic hydroxyl groups, those containing mercapto groups, those containing isocyanate groups, those containing vinyl groups, and those containing vinyl groups. Examples of silicon-bonded hydrogen-containing compounds that are preferably used in combination include ωx Ols Cl1i CH3013H. Here, R in the formula is an alkylene group, m is 5 to 10,000, and n is 2 to 100.

Furthermore, the fluorine-containing polymer in this invention is a polyfluoroalkyl polymer or a fluoropolyether polymer, and the polyfluoroalkyl polymer has a fluoroalkyl group, such as F3C+CFzb, H+CFrh.
, CIFJ÷σ2 Kusunoki.

The fluoropolyether polymer has a main structural unit represented by the general formula Cx Fzx O (where X is an integer of 1 to 4) and has an average molecular weight of about 1000 to 5.
0000 polymer. Similar to the above-mentioned organopolysiloxane, these fluorine-containing polymers have functional groups such as epoxy groups, amino groups, carboxyl groups, hydroxyl groups, mercapto groups, isocyanate groups, and cyanate groups introduced therein. Can give examples. That is, 0CN+CHg+TNl[X] CJ+z part ÷ Cur
) rNQ), CsF+4H40H, C+. Ft,■)J
HCtH,OH.

C6F + zSCHrCHzOCO+ CHz hN
Hz, CsF+ aJ, Shabi-CFtO+CzFa
O7r(-CFtOushiσρto H2σ.

11ooc-cF, 0(-CFrCF-0-)t-←a
20→τσ1, ■應−cpzo−(−CZF, 0−)−
j−+CFzO+−σ2ω times 1, HOOlrCFJ +
CJ40 +r+CPzO÷1CFz-01zOH.

CF3 F + cp-cpro −)i-CF-COOOI3
, σ, target, etc.

In addition, when using a combination of two or more types of organopolysiloxanes or fluorine-containing polymers, or both, which have the above functional groups, the functional groups of each polymer as a unit may mutually interact. When they are combined so as to react with each other, the molecular weight of the polymer increases further due to the reaction, and the chain length of one molecule of the polymer forming the coating becomes long, making it resistant to shearing force. For example, a polymer whose functional group is an epoxy group (which may be an organopolysiloxane, a fluorine-containing polymer, or both; the same applies hereinafter), an amino group, a carboxyl group,
Combination with a polymer containing at least one type of functional group selected from hydroxyl group and mercapto group, a polymer whose functional group is carboxyl group or ester group and at least one type selected from amino group and hydroxyl group A combination of a polymer containing an isocyanate group or a cyanate group as a functional group and a hydroxyl group, an amino group,
A combination with a polymer containing at least one type of group selected from mercapto groups and carboxyl groups, a combination of a polymer whose functional group contains a vinyl group and a polymer whose functional group contains silicon-bonded hydrogen, or a hydroxyl group or an alkoxyl group. Preferred examples include combinations that can be made to have a high molecular weight through condensation reactions, such as alkoxycarbonyl groups. Furthermore, a combination of organopolysiloxane or fluoropolymer or a mixture thereof with a polymer other than these is also an effective means.

Application methods include direct application when the polymer is a low viscosity liquid, and application methods such as ketones such as acetone and methyl ethyl ketone, esters such as methyl acetate and ethyl acetate, etc. when the polymer is a high viscosity liquid, semi-solid or solid. It can be applied by diluting or dispersing it with an organic solvent such as aromatic hydrocarbons such as xylene and toluene, and organic halides such as methyl chloroform, trichloroethylene, and trichlorofluoroethane, alone or in combination.Dip method is also available as a coating method. Although possible, spraying and smearing are preferred. And the film thickness is about 0.01μ of monolayer level.
m is also possible, but the preferred film thickness is 0, O1 to 5. On
It is. This is because if it is less than 0.01 μm, it is difficult to obtain the expected wear resistance and lubricity;
This is because if the amount exceeds 100%, the terminal reactive group will remain as an unreacted group, reducing the original lubricity.

Further, by combining a compound that dries quickly at room temperature and an organopolysiloxane or a fluorine-containing polymer, a coating liquid that cures only by drying at room temperature can be obtained. Here, the room-temperature, quick-curing compound is a modified isocyanate compound or an epoxy compound, and for these, an organopolysiloxane or Reactant (prepolymer) that can react with a fluoropolymer
The coating liquid dries quickly at room temperature and hardens. By using such a method, there is no need for curing equipment such as a heating furnace, and coating processing at a construction site becomes extremely easy.

〔Example〕

Example 1: A stainless steel (SUS303) disc (
(outer diameter 33 mm, inner diameter 6 mm, thickness 6 mm) was thoroughly washed with trichlorethylene steam cleaning, dried, immersed in a 2% by weight dispersion of isocyanate prepolymer containing fluoropolyether polymer, and heated for about 80 min for 1 minute. It was pulled up at a speed of 1 liter and dried at room temperature for about 10 minutes to harden it. The components of the coating liquid here are isocyanate compounds [manufactured by Nippon Polyurethane Co., Ltd.: Coronate 201412 g-fluoropolyether polymer (manufactured by Montefluos, Italy: Fomb)
rinZ-DOL) Ig, 49 g of Freon R113 (manufactured by Mitsui Fluoro DuPont: Freon TF), and 49 g of acetone.

The sliding properties of the obtained test pieces were determined according to a method similar to the actual usage conditions as shown below. That is, Matsubara thrust type friction tester (manufactured by NTN Rulon)
The mating material was PTFE-containing resin (Nil-ron BP manufactured by Western Bear Rulon Industries Co., Ltd.) at a pressure of 150 kg/c11".
, ON for 5 minutes at a speed of 30 m/min and an atmosphere of 25°C.
The intermittent 5-minute OFF test was performed about 6 times, and the friction coefficient was measured each time. The results were evaluated in two levels: those with large fluctuations (x) and those with small fluctuations (○), and the obtained results were summarized in a table.

Example 2: Instead of an acetone dispersion of an isocyanate prepolymer containing a fluoropolyether polymer, a coating solution prepared by preparing a low molecular weight fluoroalkyl polymer containing an epoxy group with isopropyl alcohol to 2% by weight was used as a coating liquid. A test piece was prepared in exactly the same manner as in Example 1 except for the above, and the change in friction coefficient over time was determined, and the obtained results are also listed in the table.

Example 3; A test piece was produced in exactly the same manner as in Example 1, except that silicone oil having a hydroxyl group at the end group (manufactured by Shin-Etsu Chemical Co., Ltd.: X22-160c) was used instead of the fluoropolyether polymer. The changes in the coefficient of friction over time were determined, and the obtained results are also listed in the table.

Comparative Example 1: In addition to cleaning and drying the surfaces of both the disk-shaped test piece and the PTFE-containing resin test piece, the changes over time in the coefficient of friction were measured in the same manner as in Example 1 without any coating treatment. . The obtained results are also listed in the table.

Comparative Example 2: The disk test piece was also made of the same material as the PTFE-containing resin test piece, and no treatment was performed other than cleaning and drying the surface of the PTFE-containing resin test piece, which was the counterpart material. Changes in the coefficient of friction over time were measured in the same manner as in Example 1 without applying any of the above. The obtained results are also listed in the table.

Comparative Example 3: Approximately 0.5 g of general-purpose grease was added to the sliding part between the disc-shaped test piece and the mating material, the PTFE-containing resin test piece, and the change in friction coefficient over time was measured in the same manner as in Example 1 above. The results obtained are also listed in the table.

Comparative Example 4: Fluoropolyether polymer having no functional group at the terminal group (manufactured by Montefluos, Italy: Fomblin Z-'25)
A test piece was prepared in exactly the same manner as in Example 1, except that fluoropolyether polymer having a hydroxyl group was used in place of the fluoropolyether polymer, and its friction coefficient was determined, and the obtained effects are also listed in the table.

Looking at the results in the table, in Comparative Example 1, in which a stainless steel disc test piece and a PTFE-containing resin test piece were slid, the coefficient of friction was large at the first time, and decreased from the second time onwards. Also, in Comparative Example 2 in which PTFE-containing resins were slid together, the coefficient of friction was large at the first time and gradually decreased from the second time onward. Comparative Example 3, in which general-purpose grease was added to the sliding parts of Comparative Example 1, was used in the initial stage (1~
The third time) showed a low friction coefficient, but it gradually increased. The same was true for the film of a fluoropolyether polymer and an isocyanate compound having no functional groups (Comparative Example 4).

On the other hand, Examples 1 to 3 in which a coating of a fluoropolymer or organopolysiloxane having a functional group at at least one end was formed on a stainless steel disk were stable with a low coefficient of friction of about 0.04.

From this, it can be seen that the coatings on the stainless steel specimens as in Examples 1 to 3, in which the terminal functional groups reacted with each other and polymerized,
It works in the same way as a transfer film made from tetrafluoroethylene resin,
It is thought that the friction coefficient was extremely low from the beginning.

〔effect〕

Since the seismic isolation sliding device of this invention has excellent frictional characteristics that are stable and economical, it can be said that the significance of this invention is extremely large.

[Brief explanation of the drawing]

The figure is a schematic cross-sectional view for illustrating the structure of the seismic isolation sliding device. 1...Sliding support, 2...Horizontal spring,
3...Tetrafluoroethylene resin-containing temporary, 4...
...Metal plate.

Claims (1)

[Claims] One of the sliding surfaces that causes slippage during seismic isolation is made of a resin whose main component is tetrafluoroethylene resin, and the other surface is made of a fluoropolymer or organopolymer that has a functional group on at least one end. A seismic isolation sliding device characterized by using a metal plate coated with one or a mixture of siloxanes.