JPH0420093B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-locking agent composition for realizing the effects of locking, adjusting the position, or sealing a screw member, and a self-locking agent composition manufactured by exclusively utilizing the properties of the composition. This invention relates to a king screw member.

BACKGROUND ART Conventionally, as a measure to prevent screw members such as bolts and nuts from loosening, it has been widely practiced to attach a plastic substance to the screw surface. Examples of this method include the following methods. A method in which the screw surface is machined such as perforation, and thermoplastic resin is attached and embedded. A method in which a piece of thermoplastic resin is pressed against the heated screw surface. A method in which thermoplastic resin powder is sprayed onto the threaded surface and then heated and fused. A method in which the thread surface is roughened by chemical treatment or mechanical treatment (for example, sandblasting) in advance, and then thermoplastic resin powder is fused. This method involves applying adhesion strengthening treatment such as primer treatment to the threaded surface in advance, and then heat-sealing the thermoplastic resin.

However, in the above conventional examples, except for those in which a thermoplastic resin is applied secondarily after so-called primary treatment such as primer treatment, mechanical treatment, or chemical treatment, problems remain in the adhesion. There were practical problems. For those that require primary processing, there is a problem in that the processing itself is required, resulting in waste of time and materials.
In particular, among the above methods, primer treatment is the most desirable in terms of performance, but it is relatively expensive to apply the self-locking agent composition to the entire surface of the screw member, even though it is only a part of the screw member. It is also understood that there was a waste of material as a primer treatment agent had to be applied. However, it is difficult to perform primer treatment only on the area to which the self-locking agent is applied due to the processing process.

The first object of the present invention is to obtain a self-locking agent composition that can exhibit an adhesive strength equivalent to or higher than that of nylon that has been subjected to primer treatment on the threaded surface without requiring primer treatment. There is a particular thing.

A second object of the present invention is to provide a self-locking screw member in which nylon is more firmly bonded to the screw member by a simple manufacturing method exclusively using the self-locking agent. There is a particular thing.

A self-locking agent composition for achieving the above first object comprises a first material of polyamide or copolyamide in a volatile solvent, and a second material for making the first material compatible with the threaded surface. This is a self-locking agent composition characterized in that it contains the following ingredients to form a mixed dispersion.

Further, the self-locking screw member for achieving the second object includes a first material of polyamide or copolyamide in a volatile solvent, and a second material for making the first material compatible with the thread surface to which it is attached. The self-locking screw member is characterized in that a mixed dispersion solution containing the two materials is applied to at least a portion of the screw surface and heat-fused.

Examples of the first material nylon used in the self-locking agent composition include nylon 6, nylon 6/6, nylon 6/10, nylon 8, nylon 11, nylon 12, or copolymers thereof. Can be used.

Things to consider when selecting a nylon type are that the melting point is relatively lower than the decomposition temperature, making it easy to process without the need for complex heat control, and that the shape of the applied product does not change significantly during melting. viscosity, good adhesion to adherend screws, low water absorption, high resistance to scratching, excellent toughness and impact resistance, high hardness and strength, durable and elastic. In particular, nylon 11 or 12 or copolymers thereof are preferably used because they have excellent chemical resistance, abrasion resistance, and a small coefficient of friction, but are not limited to these.

The particle size of the nylon powder used is 10~
A good range is 500μ, preferably 30 to 300μ.

The second material necessary to effectively apply nylon to self-locking screw tightening members and strengthen its adhesive strength while taking advantage of the excellent properties of nylon is (A) a composition made of epoxy resin and phenolic resin (B). ) A composition comprising an epoxy resin and an organosilicon compound having an amino group, an epoxy group, or an oxirane group (C) A composition comprising an amino resin added to the composition of item (B) above (D) An epoxy resin Compositions consisting of titanate and titanate are effective, but compositions of items (B) and (C) are particularly optimal.

As the epoxy resin used as the composition of the second material, bisphenol A type epoxy resins having an average molecular weight of 800 or more, such as Epicoat 1004, 1007, and 1009 manufactured by Ciel Corporation, are good.
2900 Epicote 1007 is optimal.

As the phenolic resin used in combination with the epoxy resin, phenolic resin, cresol-modified phenolic resin, etc. are preferable, and the mixing ratio is 1/1 in the weight ratio of epoxy resin/phenolic resin.
A range of about (0.5/2.0) is preferable.

Further, as the organic silicon compound added to the epoxy resin, an organic silicon compound having an amino group, such as γ-aminopropyltriethoxysilane, N+β
Aminoethyl + γ-aminopropyltrimethoxysilane, γ-amino-propyltrimethoxysilane, etc., and organic silicon compounds having an epoxy group or oxirane group, such as γ-glycidoxypropyltrimethoxysilane, γ + β-methylglycidoxy + propyl Trimethoxysilane etc. are effective.

The ratio of the organosilicon compound added to the epoxy resin is preferably in the range of 1/(50 to 2) in terms of weight ratio of organosilicon compound/epoxy resin, and more preferably 1/(20
-5) are preferred.

Amino resin used in combination with epoxy resin acts as a curing agent for the epoxy resin, increasing the toughness of the resin film formed on the surface of the screw member,
Improves heat resistance, chemical resistance, abrasion resistance, and weather resistance. Examples of the amino resin include compounds containing amino groups such as melamine resins, urea resins, and aniline aldehyde resins, and resins obtained by condensation reactions of aldehydes.

In addition, the isocyanate used in combination with the epoxy resin acts as a curing agent and a crosslinking agent for the epoxy resin when the self-locking agent of the present invention is applied to the screw member and hardened by heating on the surface to which the screw member is attached. This increases the adhesion to the surface to be adhered to and the nylon, and also increases the toughness of the resin film formed on the screw member, thereby preventing the resin film from being damaged or peeled off when the screw member is threaded. Therefore, the isocyanate used in the present invention is not particularly limited as long as it has such an effect and can heat-fuse the powdered nylon to the threaded surface via the epoxy resin. The isocyanate includes an isocyanate compound, a blocked isocyanate compound, and preferably a blocked isocyanate compound such as tolylene diisocyanate and hexamethylene diisocyanate. A specific example of tolylene diisocyanate is coronate.
AP staple (manufactured by Nippon Polyurethane Industries Co., Ltd.)
There is a product name). Furthermore, the blending ratio of isocyanate is preferably in the range of 5/(1 to 5) in weight ratio of epoxy resin/isocyanate.

The titanate used in combination with the epoxy resin is a tetraalkoxy titanium compound, a titanium-based coupling agent, etc., and preferably isopropyl tri(N-aminoethylamino) titanate, diisopropyl (dioctyl pyrophosphate) titanate, tetradioctyl bis (ditridecyl phosphite) titanate, tetra(2.2-diallyloxymethyl-1-butyl)bis(ditridecyl) titanate, and the like. The blending ratio of this titanate is preferably 1/(1 to 5) in weight ratio of epoxy resin/titanate.

Examples of volatile solvents used in the self-locking agent composition include aromatic solvents such as benzene, toluene, and xylene; 1.2.4. trichloroethylene;
1.1.1. Chlorinated solvents such as trichloroethane, ketone solvents such as acetone and methyl ethyl ketone, etc. can be used, but in short, any solvent that can disperse the first material and the second material may be used, preferably the second material. It is desirable to use a solvent in which the material is soluble. It is not limited to the above example.

The self-locking agent composition includes a first material and a second material.
It is obtained by dispersing the material in a volatile solvent.
The self-locking agent composition thus obtained is applied to an adherend, and at the same time as the volatile solvent is dried,
Alternatively, by heating after drying, a treated surface of the second material similar to that treated with the primer is formed on the adherend,
The first material, nylon, firmly adheres to the adherend.

1 to 4 show an example of a bolt as a screw member and an application example of a self-locking screw member. FIG. 1 shows an elliptical self-locking agent composition 5 coated on a part of the threaded portion 3 of a hexagon socket head bolt 1. As shown in FIG. FIG. 2 shows a bolt 7 similarly coated with the self-locking agent composition 5. In FIG. 3, a self-locking agent composition 5 is applied in a band-like manner to the threaded portion 3 of a set screw 9 over the entire circumference. FIG. 4 shows a hexagonal socket bolt 1 coated with a self-locking agent composition in the form of a band, similar to that shown in FIG.

As pretreatment, degreasing with trichlorethylene or the like is sufficient. The material of the bolt itself may be iron, copper, brass, stainless steel, etc., as well as plated materials such as chromium, zinc, chromate, nickel, etc.

As shown in FIGS. 1 to 4, after a predetermined self-locking agent composition is applied to a screw member, it is heat-fused either simultaneously with drying or after drying. The self-locking agent composition after fusing is shown in reference number 11.
Indicated by Figure 5 shows an example of the self-lock function. In this state, the plate material 15 is fixed by screwing the bolt 7, whose threaded portion is coated with a self-locking agent, into the female thread of the base material 13. It is strongly self-locked by the self-locking agent 11.
Figure 6 shows that the set screw 17 is screwed into the female thread of the base material.
The state in which the lever 19 is adjusted and positioned at the tip of the screw against the force of the spring 21 is shown. FIG. 7 shows an example of the sealing effect, in which a hexagon socket head bolt 1 with a self-locking agent 11 applied in a strip around the entire circumference is screwed into the bottom of a container (for example, an oil container) 23, and a liquid such as oil is removed. This is an example of a sealing effect. It is of course applicable not only to liquids but also to fluids such as air. Furthermore, as can be seen from FIG. 7, the self-locking agent composition can be applied to the threaded portion of a water faucet, for example, in place of the commonly used sealing tape.

Example 1 In the solvent methyl ethyl ketone, 100 parts by weight of nylon 11 as the first component, 5 parts by weight of epoxy resin,
Isocyanate (Coronate AP Staple)
After dispersing 3 parts by weight and filling between metal surfaces and drying,
The shear adhesive strength was tested by heating and fusing at 220°C for 30 minutes. As a result, the average shear adhesive strength was 341 kg/cm, compared to the average value of 217 kg/cm when only the nylon component was dispersed.

Example 2 After degreasing M8 x JIS 2nd class bolt, chrome plated product with trichlorethylene, Nippon Rilsan Co., Ltd. nylon-11: Ciel Epicote 1007: Isocyanate
The composition obtained by dispersing AP staples in a solvent at a weight ratio of 100:5:3 was applied to the threaded surface, and after air-drying, the composition was heated at 220°C for 30 minutes to effectively deposit it on the threaded surface. A self-locking screw member was obtained by fusion bonding.

When the above self-locking screw member was screwed into the female nut member and the torque strength in the tightening direction and return direction was measured, the average value of the tightening strength for the first to fifth times was 55, 40, 30, 25, 20 ( Kg・cm). And the return torque is the same, 50, 37, 28,
It was 22 and 18. It can be used repeatedly more than 5 times in accordance with the JASO (F-106-74: Automotive locking hexagon nut) standard.

In addition, regarding heat and cold resistance, it was sufficiently usable in the range of -50°C to 120°C. Chemical resistance and weather resistance are based on the characteristics of nylon itself.

Self-locking screw parts are used in automobiles, motorcycles, bicycles, vehicles, household electrical equipment, housing equipment, communications equipment, sewing machines, eyeglasses, hydraulic and pneumatic equipment,
Applicable to various screws for agricultural machinery, construction machinery, shipbuilding, packaging machinery, water supply parts, and other machinery and equipment.

This invention is characterized in that a first material of polyamide or copolyamide and a second material for making the first material compatible with the threaded surface to be adhered are included in a volatile solvent to form a mixed dispersion. The self-locking agent composition according to the above is capable of exhibiting an adhesive force equivalent to or higher than that of nylon that has been subjected to a primer treatment on the threaded surface, without requiring a primer treatment.

A mixed dispersion solution containing a first material of polyamide or copolyamide in a volatile solvent and a second material for making the first material compatible with the threaded surface is applied to at least a portion of the threaded surface. The self-locking screw member, which is characterized by being coated and heat-fused, is a simple manufacturing method that exclusively uses the self-locking agent composition, and it is possible to bond nylon to the screw member even more firmly. A self-locking member can be provided.

[Brief explanation of drawings]

The drawings all show examples; Fig. 1 is a side view of a part of the threaded part of a hexagon socket head cap screw with an elliptical self-locking agent composition applied thereto, and Fig. 2 is a side view of a part of the threaded part of a hexagonal socket head cap screw coated with the self-locking agent composition. Fig. 3 is a side view showing a self-locking agent composition applied to an oval-shaped self-locking agent composition, Fig. 3 is a side view showing a self-locking agent composition applied to a set screw in the form of a band around the entire circumference, and Fig. 4 is a side view showing the entire threaded part of a hexagon socket head bolt. FIG. 3 is a side view showing a self-locking agent composition applied in a circumferential band. Fig. 5 is a side view showing the self-locking state with a sectional view of the left half of the figure, Fig. 6 is a partially cutaway sectional side view illustrating the setting screw position adjustment (adjustment) state, and Fig. 7 is the fluid sealing. It is a sectional view explaining an effect. 5...Self-locking agent composition (applied state),
11...Self-locking agent composition (heat-fused state).

Claims (1)

[Claims] 1. Mix a first material of polyamide or copolyamide powder with a particle size of 10 to 500 μm in a volatile solvent, and a second material of epoxy resin to make the first material compatible with the threaded surface, and The first material is dispersed in the volatile solvent, and the second material is dissolved in the volatile solvent to form a mixed and dispersed liquid composition, and the composition is applied to the threaded surface of an adherend having a threaded part. 1. A method for producing a self-locking screw member, which comprises coating at least a portion of the composition, volatilizing the volatile solvent of the composition, and heat-sealing the composition.