TWI658227B - Anti-charge hose - Google Patents

Abstract

The invention provides a sliding property and abrasion resistance which can improve the inner surface. Consumable anti-static hose.

The anti-charge hose of the present invention is characterized in that it will have a flow The inner layer of the road and the outer outer layer formed on the inner layer are provided. The inner layer is formed of nylon and contains an antistatic agent. The outer layer is made of urethane elastomer and polyfluorene. It is formed by mixing any one or more of amine elastomer and polyolefin elastomer.

Description

Anti-charge hose

The present invention relates to a charging prevention hose.

As a resin hose system having a flow path for passing the conveyed material, it is revealed that it is formed by a polyester-based elastomer composition containing a polymer-type antistatic agent with a polyolefin / polyether copolymer on the inner surface. Anti-static hose (for example, Patent Document 1). However, since the antistatic hose of Patent Document 1 has no transparency, the inside of the antistatic hose cannot be identified from the outside.

On the other hand, on the market, a transparent antistatic charging hose formed by using a urethane elastomer as a main component and adding an antistatic agent is sold.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2006-220232

However, when the urethane elastomer is used as the main component of the charging prevention hose, the urethane elastic system has poor sliding properties and low abrasion resistance. Therefore, the so-called transfer material is liable to be stuck. Live with electricity to prevent soft The problem of perforation on the inner surface of the tube due to abrasion on the surface. In addition, there is also a problem that the inner peripheral surface of the electrification prevention hose is worn due to the conveyed matter, and as a result, the conveyed matter is contaminated due to the abrasion powder generated.

Then, this invention aims at providing the antistatic hose which can improve the sliding property and abrasion resistance of an inner peripheral surface.

The electrification preventing hose of the present invention is characterized by including an inner layer having a flow path and an outer layer formed on the outer layer of the inner layer. The inner layer is formed of nylon and contains an antistatic agent. The outer layer is formed by any one or a mixture of two or more of urethane elastomer, polyamide elastomer and polyolefin elastomer.

According to the present invention, the inner layer and the outer layer are provided, and the inner layer contains a nylon and an antistatic agent harder than the elastomer, so that the antistatic property can be obtained, and the sliding and abrasion resistance of the inner surface can be improved. .

R‧‧‧Hose bending radius at the beginning of the test (mm)

θ‧‧‧ tilt angle

10‧‧‧ Hose

11‧‧‧ Bending rigidity test device

12‧‧‧ fixed section

14‧‧‧ movable section

16‧‧‧ transfers

17‧‧‧ hose

18‧‧‧ Support

20‧‧‧ Heavy Hammer

22‧‧‧Rotating disk

24‧‧‧Material for wear

FIG. 1 is a diagram showing a method for evaluating sliding properties.

FIG. 2 is a diagram showing a schematic structure of a bending rigidity test device.

FIG. 3 is a diagram showing a schematic structure of an abrasion resistance test apparatus.

Hereinafter, embodiments of the present invention will be described in detail. The electrification prevention hose of this embodiment is provided with an inner layer having a flow path and an outer outer layer formed on the inner layer, so that the aforementioned flow can be recognized from the outside. On the road.

The inner layer base material is a material that is harder than the outer layer and has transparency, and is formed of, for example, nylon. The inner layer can be used to improve the sliding and abrasion resistance of the inner peripheral surface. The nylon system can be formed by, for example, any one or more of PA11, PA12, PA610, PA612, PA1010, PA1012, PA1212, PA6, PA66.

In addition, the inner layer system preferably contains 15 to 50% by weight of an antistatic agent. As a result, the surface resistivity of the inner layer becomes less than 1.0 × 10 ¹¹ Ω / sq. As the antistatic agent system, for example, any of a surfactant type, an ion conductive material type, and a polymer type can be used. When the content of the antistatic agent is less than 15 wt%, the surface resistivity is 1.0 × 10 ¹¹ Ω / sq or more, and sufficient antistatic property cannot be obtained. On the other hand, in a state where the content of the antistatic agent exceeds 50% by weight, sliding properties are reduced.

The thickness of the inner layer is preferably from 0.05 mm to 0.3 mm. When the thickness of the inner layer is less than 0.05 mm, the effect of improving abrasion resistance cannot be sufficiently obtained. On the other hand, when the thickness of the inner layer exceeds 0.3 mm, flexibility is deteriorated. In addition, when the thickness of the inner layer exceeds 0.2 mm, flexibility is reduced. Therefore, in a state where the thickness exceeds 0.2 mm, it is preferable to contain at least one of a plasticizer and an impact modifier.

As the plasticizer and the impact-improving material, a plasticizer and an impact-improving material generally used in nylon can be used. The inner layer can be reduced to a minimum by adding at least one of a plasticizer and an impact modifier.

In addition, the inner layer system may cause the leakage of the so-called plasticizer out of the inner surface of the hose due to the passage of time due to the addition of the plasticizer and contamination. Transfers. On the other hand, in the state where no plasticizer is added to the inner layer, the flexibility is reduced when the thickness of the inner layer is increased, but the plasticizer is not deposited on the inner surface of the hose, so there is no contaminated transfer material. Improve wear resistance.

The outer layer-based base material is more flexible than the inner layer, and can be formed from a material having transparency, such as a urethane elastomer, a polyamide elastomer, or a polyolefin elastomer. The outer layer is made of a material having a Shore hardness of 98A or less. In addition, the outer layer system is more preferably made of a material having a Shore hardness of 95A or less.

Next, a method for manufacturing the electrification prevention hose constructed as described above will be described. The electrification prevention hose is formed by extrusion molding. In the state of this embodiment, there is a method of forming an outer layer on the outer surface of the inner layer by an outer layer extruder after forming the inner layer by the inner layer extruder, or forming the outer layer in a molten state. A method in which a nylon resin in the inner layer and a urethane resin forming the outer layer are co-extruded to perform thermal fusion.

Generally, it is preferred that the resin system forming the inner layer and the outer layer be pelletized in advance. For example, the nylon resin and the urethane resin are melt-kneaded and pelletized by a uniaxial extruder, a biaxial extruder, a biaxial kneading machine, and the like, respectively.

The antistatic agent type can be selected from surfactant type, ion conductive material type, and polymer type. When mixed with a nylon resin that uses polyamide elastomer (PAE) as a base material to form an inner layer, it improves and resists The compatibility between the fibers is desirable, and at the same time, when the outer layer is a urethane elastomer or a polyurethane elastomer, the adhesion between the elastomers forming the outer layer is improved and formed, and therefore, it is ideal. Nylon resin and antistatic agent can be mixed at low speed Mixer (V-type blender, drum, etc.), high-speed rotating mixer (Henschel mixer, etc.) and mixing, melt-kneading and granulation. In addition, considering the state of leakage to the inner surface of the hose, it is preferable to select an ion conductive material type and a polymer type.

The electrification prevention hose constructed as described above is transparent, so the inside of the flow path can be identified from the outside. In addition, the anti-charge hose can be provided with an inner layer and an outer layer, and the inner layer contains nylon and a charge preventive agent which are harder than elastomers, so as to obtain the charge preventive property and improve the sliding property of the inner peripheral surface. In addition, the inner layer can be formed by using nylon to improve wear resistance. In addition, the electrification prevention hose is flexible by forming an outer layer with an elastomer.

(Modification)

The present invention is not limited to the aforementioned embodiments, and can be appropriately changed within the scope of the gist of the present invention.

For example, in the state of the embodiment described above, the hose is described as having a two-layer structure of an inner layer and an outer layer. However, the present invention is not limited to this, and an intermediate layer may be provided between the inner layer and the outer layer. In addition, the hose system can be used as a coating material by forming a coating layer made of polyvinyl chloride on the periphery of the outer layer.

In the state of the embodiment described above, a hose is formed and the inside of the flow path can be identified from the outside. However, the present invention is not limited to this. It can be applied to the colored inner layer or the outer layer and cannot be obtained from the outside. Identify hoses in the flow path. In order to color the inner layer or the outer layer of the hose, a color matrix prepared by adding a predetermined amount of the base material to a predetermined color can be applied. A method of coloring a rubber material by melt-kneading with a molding machine, or a method of using a coloring-finished material that has been previously colored as a base material.

(Example)

An antistatic hose was produced and evaluated by the procedure shown in the aforementioned manufacturing method. The inner layer is PA11 and antistatic agent which are used as nylon. They are added to the extruder at a predetermined mixing ratio and melt-kneaded. In addition, the plasticizer and the impact modifier are added to the extruder only in a predetermined amount according to the needs, and are melt-kneaded together. The outer layer is melt-kneaded by adding urethane elastomer to another extruder. Next, co-extrusion molding was performed so that the inner layer and the outer layer had a predetermined thickness, and the antistatic hoses of Examples 1 to 4, 12, and 13 were manufactured.

In Example 5 and Example 6, the materials of PA11 and PA12, which are nylons, were mixed at a mass ratio of 1: 1 to form an inner layer. Examples 7 to 11 use PA12, which is a nylon material, to form the inner layer.

In addition, the single-layered hoses of Comparative Examples 1 to 5 were formed by a urethane elastomer. In Comparative Examples 6 to 9, PA11 or PA12 were used to form a single-layer hose. Comparative Examples 3 and 4 use urethane elastomers which are charged with antistatic prescriptions. Comparative Example 5 uses an urethane elastomer to which carbon is added as an antistatic agent. In Comparative Example 10, a hose having an inner layer formed of PA12 and an outer layer formed of a urethane elastomer was produced.

The structure of the produced hose is shown in Table 1. The hoses produced as described above were subjected to various evaluations as shown below.

(Transparency)

An SMD-type (surface-mounted) LED (2mm × 2mm × 1.5mm) was added to the produced hose as a test sample for evaluation, and it was evaluated whether the test sample for identification could be visually recognized. In a state where the sample for confirmation can be identified, it becomes ○, and in a state where the sample for confirmation cannot be identified, it becomes ×, and the result is described in the column of "Transparency" in Table 1.

(Charging prevention)

A resistance meter (manufactured by ADVANTEST, product name: R8340) was used to measure the resistance value on the inner surface of the hose, and the resistivity was calculated using the following formula.

<Calculation formula for inner surface resistivity>

Resistivity of inner surface (Ω / sq) = R × πd (L-2a)

R: measured resistance value (Ω), d: inner diameter of hose, L: length of sample hose, a: length of electrode insertion

When the resistivity on the inner surface of the hose is less than 1.0 × 10 ¹¹ Ω / sq, it becomes ○, and when it is 1.0 × 10 ¹¹ Ω / sq or more, it becomes ×. Sex "field.

(Sliding)

As shown in FIG. 1, the hose 10 is fixed straight without any bending flaws. Inside one end, an SMD type (surface mount type) LED (2mm × 2mm × 1.5mm) is placed as a transfer material 16. . Next, moving one end to the top with the other end as a fulcrum will cause the inclination angle to be 0 ° when the hose 10 starts to be tilted so that the conveyance 16 moves toward the other end when the hose 10 is horizontal. θ is measured. When the angle at which the conveyance 16 starts to move is less than 40 °, it becomes ○, and when it is 40 ° or more, it becomes ×, and the result is It is described in the column of "sliding property" in Table 1.

(Softness)

The flexural rigidity test apparatus 11 shown in FIG. 2 was used to evaluate flexibility. First, the hose was left in a constant temperature and humidity chamber (23 ° C, 50% RH) for more than 24 hours, and then installed in a bending rigidity test apparatus. The hose was cut to a length obtained by length (mm) = π ((R + OD) / 2) + (2 × OD). Here, it is R: hose bending radius (mm) at the start of the test, and OD: hose outer diameter (mm). By moving the movable portion 14 provided on the rail toward the fixed portion 12 at a speed of 100 mm / minute, the hose 10 is gradually bent to measure the bending load. The maximum bending load is equal to that of a single-layer hose with a Shore hardness of 98A formed from a urethane elastomer, and becomes ○, and in a larger state, becomes ×, the results are described in the column of "flexibility" in Table 1.

(Abrasion resistance)

Leave the hose in a constant temperature and humidity chamber (23 ° C, 50% RH) until the quality is stable. If the quality is stable, after measuring the quality of the hose, a support piece 18 of the abrasion resistance test device shown in FIG. 3 is used to fix one end of the hose 17 and at the other end, a 500g weight 20 is suspended. In the state of the single-layer hose, the test is still directly performed. In the state of the hose having the inner layer and the outer layer, the single-layer hose is formed only by the inner layer material, and the test is performed using this.

Eleven metal rods (SUS) were attached to the rotating disk 22 of the abrasion resistance test device as the abrasion target material 24. The test conditions are the length of the sample: 150 mm, the rotation speed of the rotating disk 22: 60 rpm, the number of rotations of the rotating disk 22: 50,000 times, and the test temperature: normal temperature. After the wear test, Formula (1) is used to measure the mass of abrasion.

Mass of abrasion (g) = mass before abrasion test (g)-mass after abrasion test (g) ^{. ． ．} (1)

In addition, the friction capacity (μL) was determined from the density of the hose and the mass of the friction. The abrasion capacity (μL) is equal to or lower than a single-layer hose with a Shore hardness of 98A formed from an urethane elastomer, and becomes ○, and becomes larger Next, it becomes X, and a result is described in the column of "abrasion resistance" of Table 1.

As shown in Table 1, Examples 1 to 13 formed the aforementioned inner layer from nylon, contained 15 to 30% by weight of an antistatic agent, and formed the aforementioned outer layer from a urethane elastomer. Therefore, The evaluation results of transparency, antistatic property, sliding property and abrasion resistance were all good. In addition, the thickness of the inner layer of Examples 1 to 12 is 0.05 mm or more and 0.2 mm or less, or the thickness of the inner layer is more than 0.2 mm and 0.3 mm or less, and it contains at least one of a plasticizer and an impact modifier. As a result of the evaluation of the flexibility, it became favorable.

Comparative Examples 1 to 5 are single-layer hoses formed from urethane elastomers, and the inner surface is urethane elastomers. Therefore, sliding properties and abrasion resistance were not improved. In addition, since Comparative Example 5 was based on the inner layer, carbon was added, and therefore, although it had antistatic properties, its transparency deteriorated. Comparative Examples 6 to 9 are single-layer hoses formed by nylon which is harder than urethane elastomer. Although the sliding properties are improved, the softness is deteriorated. In addition, since the content of the antistatic agent of Comparative Examples 1, 2, 6 to 10 was 10 wt% or less, the antistatic property could not be obtained.

Claims (6)

An antistatic hose comprising an inner layer having a flow path and a peripheral outer layer formed on the inner layer. The inner layer is formed of nylon and contains an antistatic agent. The outer layer is borrowed. It is formed by one or a mixture of any one of urethane elastomer and polyamide elastomer. The aforementioned charge preventing agent is a surfactant type or an ion conductive material type. The base material of the aforementioned charge preventing agent is a polymer. For amine elastomer, the content of the antistatic agent is 15-50% by weight relative to the inner layer, the inner layer thickness is 0.05mm or more and 0.30mm or less, and the outer layer thickness is 1.20mm or more and 1.70mm or less, Among them, the inside of the flow path can be identified externally, and the LED can be transferred in the flow path. The electrification prevention hose according to item 1 of the scope of patent application, wherein the outer layer is formed of an elastomer having a Shore hardness of 98 A or less. The electrification prevention hose according to item 1 or 2 of the scope of patent application, wherein the inner layer is any one or two of PA11, PA12, PA610, PA612, PA1010, PA1012, PA1212, PA6, PA66 A mixture of the above. The electrification prevention hose according to item 1 or 2 of the scope of patent application, wherein the inner layer has a thickness of more than 0.20 mm and less than 0.30 mm, and contains at least one of a plasticizer and an impact modifier. An anti-charge hose comprising an inner layer having a flow path and a peripheral outer layer formed on the inner layer, and the inner layer is formed by any one or a mixture of PA11 and PA12. Contains at least one of an ion conductive material type antistatic agent, a plasticizer and an impact-improving material with a thickness of 0.05 mm to 0.30 mm. The aforementioned outer layer is urethane having a Shore hardness of 98 A or less It is formed of an elastomer. The base material of the antistatic agent is a polyamide elastomer. The content of the antistatic agent is 15 to 50% by weight relative to the inner layer. The thickness of the outer layer is 1.20mm or more and 1.70mm or less. And the LED is transferred in the aforementioned flow path. An antistatic hose comprising an inner layer having a flow path and a peripheral outer layer formed on the inner layer. The inner layer is formed of PA12 and contains an ion conductive material type antistatic agent and a plastic material. At least one of an agent and an impact-improving material having a thickness of 0.05 mm to 0.30 mm. The aforementioned outer layer is formed by a urethane elastomer having a Shore hardness of 95A or less. The base of the aforementioned antistatic agent The material is a polyamide elastomer, and the content of the antistatic agent is 15-50% by weight relative to the inner layer, the thickness of the outer layer is 1.20mm or more and 1.70mm or less, and the LED is transferred in the flow path.