JPS6037352B2 - Synthetic resin hose - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a synthetic resin hose having a portable polyolefin outer tube.

[Prior Art] Conventionally, polyolefin resins have good moldability and excellent properties such as chemical resistance, water resistance, and film resistance, so they have been used as outer pipes for synthetic resin hoses (hereinafter simply referred to as hoses). It is widely used.

However, polyolefin resins can be used to bond polyolefin materials together, such as between polyolefin resins and polyolefin resins, or between polyolefin resins and polyolefin fibers, without the need for special surface treatment or special adhesives. It is possible to bond easily by heating and melting the material above its melting temperature, but
Since polyolefin resins do not have unsaturated bonds or polar groups in their main chains, they have poor adhesion to other materials.

Therefore, in a hose having an outer tube made of polyolefin resin, the adhesion between the commonly used reinforcing fiber layer braided with nylon or polyester fibers and the outer tube made of polyolefin resin is insufficient, resulting in the problem of peeling. on the other hand,
In order to solve this adhesive problem, Tokukan Sho 52-71724 discloses a structure in which part of the reinforcing fiber layer made of nylon is replaced with polyolefin fibers, and the reinforcing fiber layer is made of a combination of nylon and polyolefin threads. hoses are proposed.

However, in a hose with such a structure, polyolefin fibers have poor heat resistance and poor reinforcing properties.

Since it is inferior to the standard hose, there is a problem that it causes a decrease in hose performance such as pressure resistance. [Object of the invention] The present invention was invented in view of the above circumstances, and
The object of the present invention is to provide a hose with improved adhesiveness between a reinforcing fiber layer and an outer tube without causing a decrease in hose performance.

[Structure of the invention]

In order to achieve the above object, the present invention provides a reinforcing fiber layer made of nylon or polyester on the outer surface of an inner tube made of acidic nylon or polyester,
A synthetic resin hose comprising an outer tube made of flexible polyolefin resin as a head layer on the outer surface of the reinforcing fiber layer,
An adhesive layer containing a mixture of polyolefin resin powder is formed between the reinforcing fiber layer and the outer tube, and the polyolefin resin powder and the polyolefin resin powder and the inner surface of the outer tube are settled and solidified in the adhesive layer. At least it was composed.

The adhesive used in the present invention is preferably an adhesive having good compatibility with the polyolefin resin, and in particular, a brepolymer having hydroxyl groups at both ends and crosslinkable with an isocyanate crosslinking agent is preferably used. Further, as the polyolefin resin powder to be dispersed and mixed in such an adhesive, it is preferable to use a powder with a particle size of about 100 to 200 mesh, which is extracted in the middle of the manufacturing process of polyethylene, polypropylene resin, etc. If the particle size is too large, the outer It causes unevenness to be formed on the surface, and if it is too small, it will affect the adhesiveness, so the particle size should be determined appropriately depending on the application.

The amount of polyolefin resin powder mixed into the adhesion agent is preferably 50 to 20 parts by weight based on the weight of the adhesive I0, and if it is less than 5 parts by weight, no improvement in adhesion can be expected;
If the amount exceeds 100% by weight, the adhesive will not be able to form a film.

In addition, when mixing such resin powder and adhesive,
It is best to mix using benzene, toluene, or other aromatic hydrocarbon solvent while adjusting the concentration.If the concentration is too low, the adhesive will be adsorbed to the reinforcing fiber layer and the resin powder and adhesive will be separated. Therefore, the effect of the present invention cannot be expected, and if the concentration is high, it will be difficult to apply.
A concentration of 0% by weight is preferred. For example, the reinforcing fiber layer and the outer tube may be bonded together as follows using the adhesive mixed with the resin powder described above.

1 to 3 are explanatory diagrams of embodiments of the hose of the present invention.

(In the figure, 1: inner tube, 2: reinforcing fiber layer, 3: outer tube, 4: adhesive layer, 4a: adhesive, 4b: resin powder) First, the inner tube is made of nylon or polyester with flexibility. 1 is extrusion-molded, and a reinforcing fiber layer 2 made of nylon or polyester fiber is braided and fixed to the outer surface of the inner tube 1.

Next, an adhesive 4a mixed with a polyolefin resin powder 4b is brushed or soaked on the outer surface of the reinforcing fiber layer 2 to form an adhesive layer 4 of about 0.4 to 1.0 9/fence on the surface. Form and dry (Figure 1). In this state, the adhesive layer 4 is fixed by partially penetrating the saddle adhesive 4a into the reinforcing fiber layer 2, and the polyolefin resin powder 4b is formed in the coating film formed by the adhesive 4a as shown in FIG. A part of the resin powder is embedded in the coating, and the other part is exposed from the surface, and the adjacent resin powder particles are firmly embedded in a state in which they are in contact with each other.

Furthermore, on the outer surface of the adhesive layer 4, an outer tube 3 made of visible and visible polyolefin resin (a polyolefin resin partially mixed with the same type of rubber is also acceptable) heated to 150 to 200 oo is extruded. Cover.

At this time, the adhesive layer 4 is pressed against the outer tube 3 kept at a high temperature, and the adhesive layer 4 is crosslinked and cured, and the adjacent resin powders 4b, 4b in the adhesive layer 4 are melted and bonded together. resin powder 4b connected to each other and exposed on the surface of the adhesive layer 4
and the inner surface of the outer tube 3 are similarly fused and bonded, and a hose in which the adhesive layer 4 and the outer tube 3 are bonded and the entire body is joined together can be obtained (FIG. 3). [Example] Specific examples of the present invention will be shown below.

Naiyo 11.2 ribs? On the outer surface of the nylon inner tube with an outer diameter of 13.2 ribs and a wall thickness of 1, a reinforcing fiber layer made of densely braided 1260 denier double-stranded nylon threads is bonded to the outer surface of the hose. An adhesive prepared by dissolving 100 parts by weight of a low molecular weight olefin having hydroxyl groups at both ends in 233 parts by weight of a toluene solvent, and adding 1 part by weight of isocyanate as a curing agent and 0.04 part by weight of a curing catalyst. After applying it evenly and uniformly, it was dried at room temperature for about 30 minutes.

Thereafter, an outer tube made of polyolefin resin heated to about 180 oo was extrusion-molded to cover its outer surface to obtain a hose. The adhesive force between the reinforcing fiber layer and the outer tube of this hose was measured in accordance with JIS-K6301 and was 2.3.
It was column k9/25. On the other hand, polypropylene resin powder (particle size 100 mesh) was added to the adhesive in increased amounts of 5 parts by weight, 10 parts by weight, 20 parts by weight, and 30 parts by weight, and the reinforcing fiber layer and outer tube were bonded together. An adhesive layer is formed in between, and the resin powder in the adhesive layer and the resin powder and the inner surface of the outer tube are welded and integrated by heat when extrusion coating the outer tube.

The adhesive force between the reinforcing fiber layer and the outer tube of this hose was measured and found to be as follows. Since the concentration of the adhesive increases as the amount of resin powder increases, the concentration was maintained at 30% by increasing the amount of solvent. Resin powder 5 parts by weight
Weight part of 3.8k9/25 rib 10 5.6k9/25
20 parts by weight 3.6k9/25 side 30 parts by weight 2.3k9/25 ribs [Effects of the Invention] As explained above, the hose of the present invention has a reinforcing fiber layer and an outer tube made of polyolefin resin. Since an adhesive layer containing a mixture of polyolefin resin powder and adhesive is interposed between them, the polyolefin resin powder in the adhesive layer connects the reinforcing fiber layer and the polyolefin resin outer tube through the adhesive. Even if the reinforcing fiber layer and the polyolefin resin outer tube are made of different materials, it is possible to provide a hose with high adhesive strength between them.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view of the synthetic resin hose of the present invention before the outer tube is laminated, Fig. 2 is a partially enlarged cross-sectional view of Fig. 1, and Fig. 3 is a partial cross-sectional view of the synthetic resin hose of the present invention before lamination. FIG. 1... Inner tube, 2... Reinforcing fiber layer, 3...
...Outer tube, 4...Adhesive layer, 4a...
・Adhesive, 4b...Resin powder. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 A reinforcing fiber layer made of nylon or polyester is disposed on the outer surface of a flexible inner tube made of nylon or polyester, and a flexible outer tube made of polyolefin resin is laminated on the outer surface of the reinforcing fiber layer. In this synthetic resin hose, an adhesive layer containing polyolefin resin powder mixed therein is formed between the reinforcing fiber layer and the outer tube, and the polyolefin resin powder in the adhesive layer and the polyolefin resin powder are mixed together. A synthetic resin hose characterized by being made by welding and solidifying the inner surface of the outer tube and the inner surface of the outer tube.