JPS58187689A - Jointing structure of hose mouth piece and fluorine rubber hose and its bonding method - 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] This invention relates to a joint structure and a method for joining a hose rod and a fluororubber hose that are applied to a lubrication system and a fluororubber hose.
The purpose of the present invention is to provide a fluororubber hose that does not have to worry about oil leakage or the like even when the fluororubber hose changes over time.

Conventional. Hoses require high pressure sealing properties.

An insert with an outer diameter larger than the inner diameter of the hose.

Insert the metal fitting into the hose. The outer fitting was caulked against the insert fitting from the outside, and the end of the hose was compressed and fixed to ensure sealing performance.

that time. For the purpose of improving insertion workability and preventing damage to the inner rubber of the hose. Although insertion aids such as surfactants and mineral oils are used for lubrication purposes, the insertion workability is improved as a result.

The insertion aid remains forever at the interface between the insert fitting and the inner rubber of the hose, causing deterioration of the rubber and corrosion of the insert fitting, etc., which adversely affects the equipment. There is a problem in that the adhesion between the insert fitting and the hose is small and the sealing performance is poor.

On the other hand, there are known methods for providing a rubber elastic adhesive layer on the insert fitting for the purpose of improving sealing performance, and methods for adhering the hose to the insert fitting with an adhesive layer provided on the insert fitting. Even with this method, a much larger insertion force is required than when inserting the hose into the insert fitting alone, and it is difficult to insert the hose in the mountains, and if the hose is inserted forcibly, the inner rubber of the hose and the rubber with the insert fitting may be damaged. Since the elastic fixing layer or the adhesive layer may be damaged or peeled off, which has a negative effect on the sealing property, the above-mentioned insertion aid is absolutely necessary. In order to prevent the adhesive layer from being peeled off when inserting the metal insert, methods such as applying it in a semi-vulcanized state have been devised to prevent the adhesive layer from being peeled off when inserting the metal insert. However, the problems mentioned above due to the use of insertion aids cannot be solved, and this is especially noticeable in the case of fluororubber hoses that have poor adhesion to insert fittings, and it is difficult to solve these problems. The reality is that this has become a serious issue.

The present invention was invented in view of the above circumstances, and acts as a lubricant and surface cleaner when inserted, migrates into the interior of the hose after insertion, and has no adverse effects such as deterioration of rubber and corrosion of insert fittings. They found a lubricating oil that does not interfere with the adhesion between the insert fitting and the hose, and completed the present invention.

The object of the present invention is to provide a fuel system 1 in which high-pressure sealing performance is particularly required.
1. The purpose is to provide a fluororubber hose that can be applied to smooth thread hoses, and the gist of this is that fluororubber and fluorine-containing lubricating oil are inserted between the insert fitting of the hose cap and the inner peripheral surface of the fluororubber hose. This is because an adhesive layer containing the above is interposed.

That is, an adhesive containing fluororubber that is applied to either the outer circumferential surface of an insert fitting of a hose cap or the inner circumferential surface of a fluororubber hose.

A lubricating oil that functions as an insertion aid and a surface cleaning agent, does not cause deterioration of the rubber or corrosion of the insert fittings, and does not inhibit the adhesion between the insert fittings and the hose is pre-contained, and the adhesive After applying the agent and drying it, we semi-vulcanized it to bleed out the excess fluorine-containing lubricant, fitted the insert into the fluororubber hose, and then vulcanized it to form an adhesive layer. .

According to the present invention, an excess of fluorine-containing lubricating oil is contained in the adhesive applied to either the outer peripheral surface of the composite insert of the hose cap or the inner peripheral surface of the fluororubber hose, so that the excess amount is removed during heat treatment. The heptad-containing lubricating oil bleeds out, and this is combined with the insertion aid and surface cleaning agent in 1. This makes it easier to insert the hose, and the excess heptanoyl lubricant that bleeds out during subsequent vulcanization migrates into the rubber of the fluoro rubber hose and remains at the interface forever. This eliminates the problem of adhesion and provides good sealing performance.

In addition, it acts as a surface cleaner, cleaning and removing mold release agents etc. that adhere to the inner surface of the hose during manufacturing.

This means that it also prevents adhesion inhibition.

As described above, according to the present invention, the step of applying an insertion aid can be omitted when joining the hose cap and the fluororubber hose, making workability easier, and good sea V properties can be obtained. be.

The composition of the adhesive for forming the adhesive layer in the present invention is preferably one containing fluororubber and fluorine-containing lubricating oil, and auxiliary materials to be blended together include peroxide and amine compounds.

There are vulcanizing agents such as polyol compounds, and vulcanization accelerators such as calcium hydroxide and magnesium oxide.

If necessary, reinforcing agents such as car pump hooks may be used.
Carbon black has the property of adsorbing lubricating oil, so when it is added, it has the effect of suppressing the bleeding of lubricating oil onto the surface of the adhesive layer. From the point of view of (corrosion strength), it is actually preferable to include it because it has a reinforcing effect. The blending amount may be arbitrarily selected depending on the type and amount of lubricating oil.

As the fluororubber applied to the adhesive, vinylidene fluoride-propylene hexafluoride copolymer, vinylidene fluoride-propylene hexafluoride-ethylene tetrafluoride pentapolymer, etc. are used.

Further, the fluorine-containing lubricating oil may be any lubricating oil containing fluorine.

stomach. These fluorine-containing lubricating oils have excellent heat resistance and chemical resistance, and have good oiliness. Depending on the degree of polymerization, they can be oily or waxy at room temperature (25°C), and have good workability. From this point of view, it is practically preferable to use a resin having a viscosity of 5 to 1,500 centistokes and an average molecular weight of 500 to 1,000.

Furthermore, the adhesive for forming the adhesive layer is usually an organic solvent with a nonvolatile content of 25 to 45
It is used in the form of a solution prepared at a high coulometric concentration (preferably). The organic solvent is not particularly limited as long as it dissolves fluororubber, but ketone solvents such as methyl ethyl ketone and methyl isobutyl ketone, halogen-containing solvents such as trifluorochloroethylene, and mixed solvents thereof are used. .

In addition, the method for blending the fluorine-containing lubricating oil into the adhesive composition is as follows: After dissolving a fluororubber compound obtained by mixing fluororubber and the above-mentioned auxiliary materials in an organic solvent in an organic solvent, The method of adding fluorine-containing lubricating oil is used, but if the amount of fluorine-containing lubricating oil is small, it is also possible to add auxiliary materials to the fluororubber together with the fluororubber when mixing it with a roll etc. .

The blending amount of the fluorine-containing lubricating oil is preferably 30 to 250 parts by weight per 100 parts by weight of fluororubber.

If it is too small, the insertability will be poor, and if it is too large, it will be unfavorable for the strength and sealing properties of the adhesive layer.

In addition, if the adhesive layer is too thin, it may not adapt well to the surface roughness of the insert fitting or the irregularities on the inner surface of the hose, or it may tear and peel off when the hose is inserted. It is difficult to apply it thickly.

The thickness is preferably 20 to 150 microns because the solvent tends to dry insufficiently, causing problems such as adversely affecting adhesion.

Furthermore, the reason why a fluororubber compound is used as an adhesive composition is that fluororubber cannot be co-vulcanized with other rubbers, and only fluororubber can withstand fuel-based oils such as gasoline. When the vulcanized state is melted, the rubber clasp will not flow at room temperature.

A state in which vulcanization is in progress. The semi-vulcanized state of the adhesive layer is harder than the unvulcanized state.

Kll immediately by applying pressure! Since it is not ll-shaped, vulcanization can be completed after caulking the outer metal fitting of one cap to the insert metal fitting, or the outer metal fitting can be caulked after vulcanization.

The outer circumferential surface of the metal insert is pretreated for adhesion, and a metal piece such as Puffy is usually used.

The present invention will be specifically explained below with reference to Examples.

In addition, the following parts indicate parts by weight.

Example 1 100 g of a fluororubber compound obtained by roll-mixing the following compound that does not contain fluorine-containing lubricating oil was mixed with methyl ethyl ketone F40.
After dissolving the fluorinated rubber in
A predetermined adhesive (non-volatile content: 28% by weight) was obtained by adding 65 parts by weight based on the weight part.

Fluororubber * 100 parts *; Product name: Piton vulcanizing agent ** 1.8 parts Ksu4 Total 116-8 parts 7'-''' Example 2 Example not containing fluorine-containing lubricating oil Fluororubber compound 1005"i prepared by roll-mixing the same compound as in 1. After dissolving in 400f of methyl ethyl ketone/trifluorochloroethylene mixed solvent (mixed paper ratio 75/25), fluorine-containing lubricating oil (trade name) ;DaiFloil+10.Daikin Industries'
A predetermined adhesive (non-volatile content: 36% by weight) was obtained by adding 146 parts by weight of 146 parts by weight of 100 parts by weight of fluororubber.

Examples 3 to 7 Using various adhesives with different added lubricating oils obtained in the same manner as in Example 2, attempts were made to bond a hose cap and a fluororubber hose.

In other words, the insert fitting for the hose cap is made of iron and the surface is plated with zinc and chrome (inner diameter 6 mm).

The adhesive was dip-treated on the outer peripheral surface of a cylindrical body (having an outer diameter of 8 IEI) at room temperature and then dried. after that.

A heat treatment was performed at 160° C. for 30 minutes to form a semi-vulcanized adhesive layer. Furthermore, attach the insert fittings to the fluoro rubber hose (
The inner diameter is 7H1, the outer diameter is 13.73M, and the inner layer is made of a fluororubber compound and the outer layer is made of an epichlorohydrin compound.
The mating length is 25), and the outer metal fitting (inner diameter 14
m.

The hose cap and the fluororubber hose were connected by reducing the diameter by 18%, and heat-treated at 150° C. for 60 minutes to bond them.

Below are the evaluation methods and results of insertability and sealability (Mugi-1
) is shown.

〔Evaluation methods〕

(1) Insertionability The force (insertion force) required when inserting the fluororubber hose (418 tan) into the inserter (fitting length 21) was measured using an autograph.

(2) Close one end of the insert and fittings that protrude from the sealing rubber hose, place the joint between the hose cap and the rubber hose in water, and send nitrogen gas through the other end of the rubber hose. If bubbles form in the water near the fittings. The gas pressure (KI?/, -J) was measured to examine the sealing performance (airtightness) between the hose cap and the rubber hose. The measurements were carried out under two conditions: initial stage (heat aging 1 itu) and after heat aging (120°C x 288 hours).

The composition used for the inner layer of the fluororubber hose is as follows.

Fluororubber 100 parts Carbon black 30 parts Ca (0H)2 5 parts Mg0 31 parts Vulcanizing agent 2.5 parts Total 140.5 parts Complete vulcanization 160°C x 1 hour Also, the thickness of the adhesive layer was 60μ Dip treatment was performed several times.

-2; Unit cst (centistokes), measurement temperature 2
5℃・3; Unit CP (centipoise), measurement temperature 25℃
114; Parts by weight added to 100 parts by weight of fluororubber -
5; A considerable portion of the adhesive layer was peeled off during insertion.

patent applicant 461-

Claims (2)

[Claims] (1) A hose cap and a fluorine rubber hose, characterized in that an adhesive layer containing fluorine rubber and a fluorine-containing lubricating oil is interposed between the insert fitting of the hose cap and the inner peripheral surface of the fluorocomb hose. joint structure. (2) Apply an adhesive containing fluororubber and fluorine-containing lubricating oil to either the outer circumferential surface of the insert fitting of the hose cap or the inner circumferential surface of the fluororubber hose, dry it, and then semi-vulcanize it. A method for joining a hose cap and a fluorine rubber hose, characterized in that the fluorine-containing lubricating oil is applied by applying the fluorine-containing lubricating oil, an insert fitting is inserted into the fluorine rubber hose, and an adhesive layer is formed by further vulcanization. Method.