JP3180410B2 - Screw-in member with oil-tight pre-coated seal adhesive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to prevent leakage at the time of screwing by applying in advance to a screwing portion of a screwing member such as a screw, a bolt or a plug (hereinafter referred to as a screw or the like) and solidifying the screw. so as to express the effects and adhesion effect
The present invention also relates to a screw member with a precoated seal adhesive .

[0002]

2. Description of the Related Art In order to prevent loosening of screws and the like, a coating film containing a microcapsule type adhesive is formed on screws and the like, and the microcapsules are encapsulated by crushing the microcapsules by stress at the time of tightening. Pre-coated seal adhesives which react and cure various adhesives are already widely used.

[0003]

A screw or the like to which a microcapsule type adhesive for preventing loosening and leakage has been applied in advance (hereinafter referred to as a pre-coated screw) needs to be coated with an adhesive when tightening the screw. Instead, just by tightening the screws, the effect of preventing loosening and leakage is exhibited. However, especially for large diameter screws and screws with low processing accuracy, the gap between male screw and female screw becomes large, and there is a part where the microcapsule does not break,
If the clearance cannot be sufficiently filled even if the microcapsules can be broken, oil or the like may pass through the portion in a spiral shape according to the screw shape due to pressure or capillary phenomenon, and leakage may occur.

[0004] An object of the present invention is to solve the above-mentioned problems of the prior art. In particular, even in the case where the microcapsules are difficult to be broken or there is a clearance, sufficient locking of the microcapsules and, in particular, prevention of oil leakage. It is an object of the present invention to provide a threaded member with a pre-coated seal adhesive having a remarkable effect.

[0005]

The present invention is characterized in that an adhesive and a composition comprising a combination of a microcapsule type adhesive and an oil-absorbing swellable resin are applied to at least one of the screwing surfaces of a screw member. With oil-tight pre-coated seal adhesive
It is a screw attachment member.

[0006] The microcapsule type adhesive used in the present invention is a so-called reaction in which an adhesive component contained in a microcapsule and an adhesive component outside the microcapsule are brought into contact with each other with destruction of the microcapsule and cured. Any adhesive may be used as long as it is a functional adhesive, but a microcapsule adhesive containing an epoxy resin or an acrylic resin component is particularly preferable.

[0007] It is optional to include in the microcapsules any of the reaction components to be combined, such as the main agent and the curing agent. However, in the case of an epoxy resin, either the main agent or the curing agent is encapsulated in the microcapsules and cured. It is preferable that the resin is dispersed or compatible with an accelerator, a binder component, a filler, and the like. In the case of an acrylic resin, poly (meth) acrylate and a polymerization initiator or a polymerization catalyst are encapsulated in microcapsules, and the binder and the filler are used. Those dispersed or compatible in the like are preferable. Examples of these are disclosed in JP-A-50-1
No. 51229, JP-A-57-192476, JP-A-5-192476
3-131566, JP-B-52-46339, JP-B-53-18079, JP-A-1-108284, JP-A-1-146975, JP-A-2-248485,
Japanese Patent Publication No. 1-171313).

[0008] The oil-absorbing swellable resin used in the present invention is not particularly limited as long as it can absorb oil and swell when in contact with oil to maintain a non-flowable state (solid state). Not limited. Examples of these oil-absorbing swellable resins include polynorbornene-based elastomer resins, t-butylstyrene / divinylbenzene copolymer, t-butyl methacrylate bridging polymer, neopentyl methacrylate bridging polymer, and methyl methacrylate bridging polymer. Examples thereof include a crosslinked polymer and a crosslinked polymer of a long-chain (meth) acrylate, and a commercially available product such as Oleosorb (manufactured by Nippon Shokubai Co., Ltd.) is preferably used.

[0009] The required swelling ratio of the oil-absorbing swellable resin varies depending on the size of the gap between the screws actually used, the required pressure resistance, and the like.
Preferably, it is 10 times or more. The form of use is not particularly limited, and includes granular solid, granular slurry type, sheet type, emulsion type and the like.

The adhesive composition used in the present invention comprises a microcapsule-type adhesive and an oil-absorbing swellable resin as essential components. Adhesion enhancer that enhances the adhesion with other components, lubricant that reduces the resistance (loss torque) when tightening the screw member, other fillers, stabilizers, rust inhibitors, diluents, tack removers, etc. Needless to say, this is acceptable.

[0011] The oil-tight pre-coat type seal contact according to the present invention.
In manufacturing the screwed member with the adhesive, there are a one-liquid type and a two-liquid type as a form when the adhesive composition is applied to a screw or the like. The one-pack type mixes the oil-absorbing resin and the microcapsule-type adhesive and applies it to screws, etc. It is to be applied to individual places. In each case, a solvent may be used for adjusting the liquid. In this case, either a water-based or oil-based solvent may be used as long as the performance of the composition is not impaired. In particular, a water-soluble organic solvent that hardly swells the oil-absorbing resin, such as ethanol and dimethyl ketone, is a preferred solvent.

The adhesive composition of the one-liquid type or the two-liquid type is applied to a screw or the like by an appropriate method such as dipping, brushing, and discharging from a nozzle. After that, an oil-tight pre-coated seal adhesive layer is formed on the screw surface through drying and the like. The screw or the like to be applied is generally on the male screw side, but may be on the female screw side. In addition, the leak in the screw member usually occurs when the liquid is spirally transmitted through the gap between the male screw and the female screw. Therefore, the oil-absorbing and swelling resin in the present invention does not necessarily need to be applied to the entire surface of the screw portion, and if a proper amount is partially applied, the effect of preventing leakage is exhibited.

The proportion of the microcapsule-type adhesive and the oil-absorbing swellable resin used is not particularly limited, and varies depending on the form of application of the two, but generally 5 to 100 parts by weight per 100 parts by weight of the microcapsule-type adhesive. Is used.

The screw member with the oil-tight pre-coated seal adhesive obtained in this manner has a microcapsule-type adhesive which is crushed when the screws are tightened, and the resin in the microcapsules is hardened to prevent loosening. The oil absorbing and swelling resin absorbs and swells the oils when the oil penetrates, and fills the gap between the male screw and the female screw when the oil penetrates at the portion where the microcapsule does not collapse, thereby exhibiting the effect of preventing leakage. For this reason, even if the gap between the male screw and the female screw is large due to the rough application state or the low processing accuracy of the screw or the like, and the adhesive component cannot sufficiently fill the gap when tightening, This gap can be filled because the oil-absorbing swellable resin absorbs and swells the infiltrating oils. As a result, there is an effect that a good sealing property is exhibited even if the precision of the precoating of the adhesive or the precision of the thread such as a screw is reduced.

The prior art and the present invention will be modeled with reference to the drawings. FIG. 1 is a cross-sectional view showing a state where a pre-coated screw to which only a conventional microcapsule type adhesive has been applied is tightened, where 1 is a portion where the microcapsule is broken and hardened, and 2 is a portion where the microcapsule is hard to break. And leaks (spirally) through the microcapsule portion 2 that does not break.

FIG. 2 is a sectional view showing an example of the present invention.
A pre-coated screw in which a microcapsule-type adhesive (3 indicates a microcapsule) and an oil-absorbing and swellable resin 4 are applied is shown.

FIG. 3 is a sectional view showing a state in which the pre-coated screw of FIG. 2 is tightened, 5 is a portion where the microcapsules are broken and hardened, 6 is an oil-absorbing resin swelled by oils, The effect of preventing leakage at the gap between the screw and the female screw is exhibited. Reference numeral 7 is a portion mainly exhibiting a locking effect.

[0018]

【Example】

1) Resin used Oil-absorbing swellable resin; OLEOSORB SL manufactured by Nippon Shokubai Co., Ltd.
(Water slurry type particle size 50 ~ 450μ, concentration 60wt
%) Microcapsule type adhesive; Three Bond Co., Thr
Stock solution of eeBond2471 (a pre-coated seal adhesive containing acrylic microcapsules)

2) Male screw and female screw (see diagram) Male screw; M28 P = 1.5 Zinc chromate plated hexagon socket plug (JIS class 2) Female screw; Aluminum pressure-resistant jig (M28 threaded)

3) Method of preparing pre-coated screw The water of the oil-swellable water-slurry resin is replaced with dimethyl ketone. Since the oil-absorbing swellable resin used in the examples does not swell in dimethyl ketone, to shorten the time in the drying step,
Further, in order to prevent rusting of the screwed surface of the screw, dimethyl ketone which is more volatile than water was replaced, but this is not essential. 400 parts by weight of dimethyl ketone is mixed, stirred and dispersed with respect to 100 parts by weight of the oil-absorbing swellable resin. While the liquid is being stirred, the screw portion of the degreased male screw is immersed, and the oil-absorbing and swellable resin is attached to the male screw. (The oil-absorbing swelling resin has adhesiveness and is hard to fall off after adhesion and drying, and the adhesion increases in the valley of the screw.) After solvent evaporation, drip ThreeBond 2471 onto the male screw with the oil-absorbing swelling resin by the conventional method. Apply by the method. After evaporation of the solvent, a pre-coated screw is obtained.

4) Conditions for preparing seal adhesion test specimen Aluminum washer with several scratches on the precoated screw prepared in 3) (to prevent sealing at the washer)
78N ・ m ｛8Kgf ・ on 2) aluminum jig
Then, the sample was tightened at the same temperature and allowed to stand at room temperature for 24 hours to prepare a seal adhesion test specimen. Assemble the above test piece in a pressure test jig and use commercially available engine oil S as a pressurizing medium.
After filling the class D (10W-30), closing the valve and sealing it, put it in a thermostat at 150 ° C. After one hour, a pressure of 98 kPa {1 kgf / cm ² } is applied to the oil with N ₂ gas. Thereafter, every hour, 98kPa ｛1kgf / cm
²を Increase the pressure at a time and check for leaks.

5) Test Results In the six test specimens using only ThreeBond 2471, leakage occurred at 1 kgf / cm ^{2 in} all 6/6, but in the six test specimens of the example, 3/6 showed 3 kgf / cm ² , 1
/ 6 6 kgf / ^cm 2, 2/6 has 7 kgf / cm ² or more pressure resistance, remarkable effect of precoating type seal adhesive member of the present invention was confirmed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a precoated screw to which only a microcapsule type adhesive is applied is tightened.

FIG. 2 is a cross-sectional view of a pre-coated screw to which a microcapsule type adhesive and an oil-absorbing swellable resin are applied.

FIG. 3 is a cross-sectional view showing a state where a pre-coated screw of FIG. 2 is tightened.

[Explanation of symbols]

 1,5 Microcapsules are broken and hardened part 2 Microcapsules are hardly broken 3 Microcapsules 4 Oil-swelling resin 6 Swelled oil-swelling resin

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takayoshi Goto 14-1 Chidoricho, Kawasaki-ku, Kawasaki-shi, Kanagawa Japan Co., Ltd. Inside the Japan Catalyst Kawasaki Laboratory (56) References JP-A-55-165398 (JP, A) JP-A-48-41155 (JP, A) JP-A-62-252491 (JP, A) JP-A-1-108284 (JP, A) JP-A-2-248485 (JP, A) JP-A-50-151229 (JP, A) JP-A-60-63266 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16B 39/22 C09J 201/00-201/10

Claims (1)

(57) [Claims] 1. A screw with a precoat-type seal adhesive, wherein an adhesive composition comprising a combination of a microcapsule-type adhesive and an oil-absorbing and swellable resin is applied to at least one of the screwing surfaces of a screwing member. Wearing member .