JP2018044656A - Structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure having less dimensional change due to water absorption, excellent in dimensional accuracy, and capable of controlling viscous fluid.SOLUTION: A structure of this invention is a structure including a flow passage. A part of the structure constituting at least a part of the flow passage contains (A) polyphenylene ether resin, (B) styrene resin, and (C) filler. The structure comprises a resin composition containing (C) the filler of 20-70 pts.mass, for the total of (A) the polyphenylene ether resin and (B) the styrene resin as 100 pts.mass, and surface roughness of a part of the structure is within a range of 0.1-1.5 μm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a structure. More specifically, the present invention relates to a structure made of a polyphenylene ether-containing resin composition and having high control accuracy of viscous fluid.

  In recent years, a viscous fluid control structure with dimensional stability, etc. that can prevent leakage of contents and accurately measure the flow rate as a sensor to ensure safety, storage stability, and prevention of environmental pollution The body is drawing attention. However, for example, a structure made of polystyrene resin or polyethylene resin is widely used in terms of moldability and material cost, but there are restrictions in terms of temperature and pressure resistance, and there is anxiety over long-term use. In addition, PPS (polyphenylene sulfide) resin, polyamide resin, PBT (polybutylene terephthalate) resin, etc. are used in structures that require pressure resistance, or when exposed to impact resistance or long-term exposure to ultraviolet rays. Some structures are made of PC (polycarbonate) resin. However, it is necessary to consider leakage due to warping and deformation, deterioration and deformation due to contact with viscous environments and environments exposed to long-term high temperature and humidity environments, and elution of resin composition components into viscous fluids.

  Although there are examples of measures for pressure resistance and dimension maintenance in processing such as protection by painting and coating and metal reinforcement frames as measures against the above usage environment and required characteristics, it is useful in terms of productivity and design There has never been a structure capable of controlling a viscous fluid made of a thermoplastic resin.

  In addition, although the metal viscous fluid control structure has high strength, its specific gravity is higher than that of resin, and depending on the type of viscous fluid, it may corrode and deteriorate. Reinforcement may be necessary. In addition, there is a lack of productivity compared to the thermoplastic resin structure, such as the need for welding in molding.

JP 2013-82837 A JP 2008-297476 A Special table 2015-500901 gazette

  The present invention has been made in view of the above, and has a structure capable of controlling a viscous fluid with little dimensional change due to water absorption and little dimensional change after being left for 2 days at 23 ° C. and 50% RH, and excellent in dimensional accuracy. Provide the body.

  That is, this invention is a structure provided with a flow path, Comprising: Part of the said structure which comprises at least one part of the said flow path is (A) polyphenylene ether resin, (B) styrene resin, and (C And (B) a resin composition containing 20 to 70 parts by mass of (C) filler with respect to a total of 100 parts by mass of (A) polyphenylene ether resin and (B) styrenic resin. The surface roughness of the part is 0.1 to 1.5 μm.

  It is preferable that the dimensional retention after part of the structure is immersed in water at 110 ° C. for 1000 hours is 98% or more.

  (C) It is preferable that a filler is a fibrous inorganic filler.

  The structure is preferably one selected from the group consisting of a pump, an aspirator, an orifice, a branch pipe / groove, and a merge pipe / groove.

  Since the structure of the present invention has the above-described configuration, it can control viscous fluid, has little dimensional change after standing for 2 days at water absorption and 23 ° C. and 50% RH, and has excellent dimensional accuracy.

FIG. 1 is a schematic view (perspective view) showing an example of a part of the structure of the present embodiment. FIG. 2 is a schematic diagram (plan view) showing measurement points at the time of measurement of warpage in Examples and Comparative Examples. FIG. 3 (a) is a schematic diagram (plan view) showing the measurement location at the time of measuring the smoothness and the measurement location of the dimensional retention after being left at 23 ° C. and 50% RH for 2 days in the examples and comparative examples. (B) is a side view of (a).

  Hereinafter, a mode for carrying out the structure of the present invention (hereinafter, simply referred to as “this embodiment”) will be described in detail.

[Structure]
The structure of this embodiment has a flow path through which a viscous fluid flows. In the structure according to the present embodiment, the flow path has little dimensional change due to water absorption and is excellent in water resistance and dimensional accuracy, so that the flow rate and flow amount of viscous fluid can be controlled over a long period of time.

<Flow path>
FIG. 1 is a diagram illustrating an example of a part of a structure including a flow path 1. The channel 1 has at least one viscous fluid inlet 2 and at least one viscous fluid outlet 3. In the channel 1, the inlet 2 is on the upstream side, and the outlet 3 is on the downstream side. The viscous fluid flows from the inlet 2 toward the outlet 3. The flow path is excellent in heat resistance and smoothness, and the dimensional change due to water absorption and the dimensional change after a long period of time are small. Therefore, the flow rate and flow rate of the viscous fluid can be accurately controlled over a long period of time.

  The flow path may have a plurality of inlets and a plurality of outlets. The channel may be a bent channel, a branch channel, a combined channel, or the like.

  The flow path may control the amount, velocity, and direction of the viscous fluid flowing from the inlet to the outlet as a whole, or the viscous fluid flows at a part between the inlet and the outlet. The amount, the flow speed, and the flow direction may be controlled.

The channel may be, for example, a portion of 1 to 100% of the structure of the present embodiment, and the structure of the present embodiment may be formed only from the channel.
The size (area) of the inlet and the outlet is not particularly limited as long as the fluid can flow a viscous fluid. Moreover, the magnitude | size of the said entrance and the said exit may be the same, and may differ.

  Examples of the shape of the cross section perpendicular to the flow direction of the viscous fluid in the flow path include a substantially circle, a substantially polygon, and a shape lacking a part of these shapes (for example, a substantially semicircle). The shape of the cross section perpendicular to the flow direction of the viscous fluid in the flow path may be the same or different in the entire flow path (full length from the inlet to the outlet).

  It is preferable that the flow path is, for example, a portion where the amount of viscous fluid flowing and / or the pressure of the viscous fluid can be controlled. In addition, the flow path preferably has heat resistance that hardly causes deformation even when used in an environment of 180 ° C. or lower. From the viewpoint of securing the rigidity of the structure, the flow path may be used in an environment of 150 ° C. or lower. It is more preferable to have heat resistance that hardly causes deformation and the like.

(Physical properties)
Hereinafter, some physical properties of the structure constituting the flow path will be described.
The surface roughness (Ra) of a part of the structure is 0.1 to 1.5 μm from the viewpoint of more accurately controlling the amount, speed and the like of the viscous fluid flowing through the flow path, and 0.1 to 1 It is preferably 0.0 μm. The surface roughness may be 0.1 to 2.0 μm.
The surface roughness (smoothness) is not only important from the viewpoint of the sealing property of the joint surface or the opening, but also the resistance to the viscous fluid is reduced and the pressure loss and fluid control are stabilized. The smoothness further affects the fitting size with other parts and the capacity accuracy. Here, the part of the structure is preferably a surface (for example, the inner surface of the flow path) where the viscous fluid flowing through the flow path is in contact with the flow path.
The said surface roughness can be measured by the method as described in the below-mentioned Example, for example.

The dimensional retention of a part of the above structure after being immersed in water at 110 ° C. for 1000 hours is such that the resin constituting the flow path is not easily decomposed by water or the flow path is not easily deformed. From the viewpoint of accurately controlling the amount, speed, etc. of the viscous fluid flowing through the flow path even after flowing and using, it is preferably 98% or more, and more preferably 98.5% or more.
In addition, the said dimension retention after being immersed in water at 110 degreeC for 1000 hours can be measured by the method as described in the below-mentioned Example, for example.

  From the viewpoint of fluid control, some of the structures have not only smoothness and dimensional retention after being immersed in water at 110 ° C. for 1000 hours, but also dimensional changes after being left at 23 ° C. and 50% RH for 2 days. It is preferable that there is little dimensional change such as warpage and shrinkage and that the dimensional accuracy is excellent. Less dimensional change is preferable in that stable flow rate control and fitting dimensions that maintain hermeticity can be secured. Furthermore, it is more preferable that the dimensional change due to dynamic / static pressure such as pulsation when the viscous fluid flows and the flow path's own weight is small, and it is more excellent in durability over a long period of time, and the flow path is strengthened with filler to ensure high rigidity. It is preferable that it is made of a material.

The part of the warp of the structure is preferably 0 to 3 mm, more preferably 0 to 1 mm, from the viewpoint of more accurately controlling the amount, speed, and the like of the viscous fluid flowing in the flow path.
The warpage can be measured, for example, by the method described in Examples described later.

It is preferable that a part of the structure is difficult to change in size over a long period of time from the viewpoint of accurately controlling the amount, speed, etc. of the viscous fluid flowing in the channel over a long period of time. Specifically, a part of the structure preferably has a dimensional retention of 99.6 to 100% after being left in a temperature-controlled room at 23 ° C. and 50% RH for 2 days. More preferably, it is 100%.
In addition, a dimension retention rate can be measured by the method as described in the below-mentioned Example, for example.

From the viewpoint that a part of the structure is not easily deteriorated or deformed in a high temperature environment, the deflection temperature under load measured according to ISO75-1 is preferably 110 to 180 ° C, and preferably 120 to 170 ° C. It is more preferable that
The deflection temperature under load can be measured, for example, by the method described in the examples described later.

(Resin composition)
Hereinafter, the composition of the flow path will be described.
A part of the structure includes (A) polyphenylene ether resin, (B) styrene resin, and (C) filler, and the total of 100 parts by mass of (A) polyphenylene ether resin and (B) styrene resin. On the other hand, (C) It consists of a resin composition containing 20-70 mass parts filler.

-(A) Polyphenylene ether resin-
(A) It does not specifically limit as polyphenylene ether resin, A well-known thing can be used, A homopolymer may be sufficient and a copolymer may be sufficient. (A) Polyphenylene ether resin may be used individually by 1 type, and may be used in combination of 2 or more type.

  Examples of the homopolymer include poly (2,6-dimethyl-1,4-phenylene) ether, poly (2-methyl-6-ethyl-1,4-phenylene) ether, and poly (2,6-diethyl-1). , 4-phenylene) ether, poly (2-ethyl-6-n-propyl-1,4-phenylene) ether, poly (2,6-di-n-propyl-1,4-phenylene) ether, poly (2 -Methyl-6-n-butyl-1,4-phenylene) ether, poly (2-ethyl-6-isopropyl-1,4-phenylene) ether, poly (2-methyl-6-chloroethyl-1,4-phenylene) ) Ether, poly (2-methyl-6-hydroxyethyl-1,4-phenylene) ether, and the like. Among these, poly (2,6-dimethyl-1,4-phenylene) ether is preferable from the viewpoint of practical use as a raw material.

  The poly (2,6-dimethyl-1,4-phenylene) ether preferably has an intrinsic viscosity of 0.3 to 0.7 as measured with a chloroform solution at 30 ° C. from a practical viewpoint as a raw material. More preferably, it is 0.35-0.6. By using two or more kinds of poly (2,6-dimethyl-1,4-phenylene) ether having different intrinsic viscosities, it is possible to widen the molecular weight distribution.

  Examples of the copolymer include a copolymer of 2,6-dimethylphenol and 2,3,6-trimethylphenol, a copolymer of 2,6-dimethylphenol and o-cresol, and 2,6-dimethylphenol. And a copolymer of 2,3,6-trimethylphenol and o-cresol. Further, it is a copolymer containing a 2- (dialkylaminomethyl) -6-methylphenylene ether unit, a 2- (N-alkyl-N-phenylaminomethyl) -6-methylphenylene ether unit or the like as a partial structure. May be.

(A) The weight average molecular weight of the polyphenylene ether resin is preferably 30,000 or more, more preferably 35,000 or more, and further preferably 40,000 or more, from the viewpoint of toughness and chemical resistance. Moreover, 100,000 or less is preferable from a viewpoint of moldability.
In this specification, the weight average molecular weight is measured by gel permeation chromatography (GPC), tetrahydrofuran is used as a mobile phase, and a calibration curve prepared using the peak molecular weight of standard polystyrene is used. It refers to the calculated weight average molecular weight.

(A) The reduced viscosity of the polyphenylene ether resin is preferably from 0.15 to 0.70 dL / g, more preferably from 0.20 to 0.60 dL / g, from the viewpoints of toughness and chemical resistance. The reduced viscosity can be controlled by the polymerization time and the amount of catalyst.
The reduced viscosity can be measured using a chloroform solution of η _sp /c:0.5 g / dL at a temperature of 30 ° C.

  (A) A polyphenylene ether resin modified with an unsaturated carboxylic acid or a derivative thereof may be used as a part of the polyphenylene ether resin used as the polyphenylene ether resin. The modified polyphenylene ether resin is not particularly limited, and known ones can be used. Examples of the modified polyphenylene ether resin include those described in JP-A-2-276823, JP-A-63-108059, JP-A-59-59724, and the like.

  The production method of the modified polyphenylene ether resin is not particularly limited and can be obtained by a known method. For example, a method in which an unsaturated carboxylic acid or a derivative thereof is melt-kneaded and reacted with a polyphenylene ether resin in the presence or absence of a radical initiator, or a radical initiator containing a polyphenylene ether resin and an unsaturated carboxylic acid or a derivative thereof. Examples include a method of dissolving in an organic solvent in the presence or absence and reacting in a solution.

The unsaturated carboxylic acid or derivative thereof is not particularly limited, and known ones can be used. For example, maleic acid, fumaric acid, itaconic acid, halogenated maleic acid, cis-4-cyclohexene-1,2- Dicarboxylic acid, endo-cis-bicyclo [2.2.1] -5-heptene-2,3-dicarboxylic acid, acid anhydrides, esters, amides, imides, etc. of these dicarboxylic acids; acrylic acid, methacrylic acid, these Ester, amide, etc .; These may be used alone or in combination of two or more.
A saturated carboxylic acid that can be thermally decomposed at a reaction temperature at the time of producing a modified polyphenylene ether to be a derivative can also be used. Specific examples include malic acid and citric acid. These may be used alone or in combination of two or more.

The content of (A) polyphenylene ether resin in the resin composition is 40 with respect to the total amount (100 parts by mass) of (A) polyphenylene ether resin and (B) styrene-based resin from the viewpoint of smoothness. It is preferable that it is -55 mass parts, and it is more preferable that it is 45-55 mass parts.
Moreover, it is preferable that content of (A) polyphenylene ether resin in the said resin composition is 25-45 mass% with respect to 100 mass% of resin compositions.

-(B) Styrenic resin-
The (B) styrene resin used in combination with the (A) polyphenylene ether resin in the structure of the present embodiment is not particularly limited, and any known one can be used as long as it is a homopolystyrene resin or rubber-modified polystyrene. Examples of the rubber-modified polystyrene include a styrene compound and a polymer obtained by polymerizing a compound copolymerizable with a styrene compound in the presence or absence of a rubbery polymer.

  The styrene compound is not particularly limited, and examples thereof include styrene, α-methylstyrene, 2,4-dimethylstyrene, monochlorostyrene, p-methylstyrene, p-tert-butylstyrene, and ethylstyrene. Among these, styrene is preferable from the viewpoint of practicality of raw materials.

  The compound that can be copolymerized with the styrene compound is not particularly limited, and examples thereof include methacrylic acid esters such as methyl methacrylate and ethyl methacrylate, unsaturated nitrile compounds such as acrylonitrile and methacrylonitrile, and maleic anhydride. An acid anhydride etc. are mentioned and can be used with a styrene-type compound.

  The amount of the styrene compound and the copolymerizable compound used is not particularly limited, but is preferably 20% by mass or less, more preferably 15% by mass with respect to the total amount of the styrene compound and the copolymerizable compound. It is as follows. Toughness can be improved by setting it as this usage-amount.

  It does not specifically limit as said rubbery polymer, A well-known thing can be used. Examples thereof include conjugated diene rubbers, copolymers of conjugated dienes and aromatic vinyl compounds, and ethylene-propylene copolymer rubbers. Specifically, polybutadiene and styrene-butadiene copolymer are preferable from the viewpoint of improving toughness.

The (B) styrenic resin is preferably polystyrene, high impact polystyrene, or a combination thereof from the viewpoint of compatibility.
In particular, when fillers are used in the combination of polyphenylene ether resin and high impact polystyrene, surprisingly, it is more difficult to cause dimensional change due to water absorption over a long period of time, and it is also resistant to heat, and has excellent dimensional accuracy. A flow path that is particularly suitable for control applications can be formed.

  The rubber-modified polystyrene preferably has a weight average molecular weight of 100,000 or more, more preferably 120,000 or more, and further preferably 150,000 or more. Moreover, it is preferable that it is 400,000 or less.

  When (B) the styrene-based resin is used in combination with a homopolystyrene resin and a rubber-modified polystyrene, the homopolystyrene resin is preferably 40 to 60% by mass, more preferably 40 to 40% by mass with respect to the total mass of both. 50% by mass.

-(C) Filler-
Examples of the filler (C) include glass fiber, potassium titanate fiber, gypsum fiber, brass fiber, stainless steel fiber, steel fiber, ceramic fiber, boron whisker fiber, mica, talc, silica, calcium carbonate, kaolin, and calcined kaolin. , Wollastonite, zonotolite, apatite, glass beads, glass flakes, titanium oxide, and fibrous carbon black, granular, plate-like, or needle-like inorganic reinforcing materials. Among these, fibrous inorganic fillers are preferable, and glass fibers are more preferable. The filler (C) may be a filler that has been surface-treated by a known method using a surface treatment agent such as a silane coupling agent.
These (C) fillers may be used in combination of two or more.

  From the viewpoint of smoothness, the (C) filler has an aspect ratio of more than 10 and an average fiber length of preferably 100 μm or more, more preferably 200 μm or more, and preferably 350 μm or less.

  When the (C) filler is a fibrous inorganic filler, from the viewpoint of smoothness, the fiber diameter (diameter) is preferably 1.0 to 20.0 μm, more preferably 2.0 to 18. It is 0 μm, more preferably 5.0 to 15.0 μm.

  The content of (C) filler in the resin composition is 20 to 70 parts by mass, preferably 20 with respect to 100 parts by mass in total of (A) polyphenylene ether resin and (B) styrene resin. -50 mass parts, More preferably, it is 20-40 mass parts. (C) If the filler content is 20 parts by mass or more, strength and rigidity as a structure can be obtained, and if it is 70 parts by mass or less, the surface smoothness and warpage of the structure can be ensured.

-Other ingredients-
Other components such as other polymers, impact modifiers, additives and the like can be added to the resin composition as long as the effects of the present invention are not impaired.
As said other polymer, the alloy material which can be used with polyphenylene ether resin is mentioned, For example, polyolefin, polyethylene, polyamide, polyphenylene sulfide, etc. are mentioned. Among these, polyphenylene sulfide is preferable.
As said additive, a plasticizer, antioxidant, a ultraviolet absorber, a stabilizer, an antistatic agent, a mold release agent, a flame retardant, a coloring agent etc. are mentioned, for example.

The method for producing the flow path is not particularly limited, and injection molding, blow molding, rotational molding, injection blow molding, extrusion molding, cutting molding, and the like can be used. From the viewpoint of productivity and design, injection molding is possible. Blow molding and injection blow molding are preferred.
As a method for forming the bent portion, post-processing by cutting may be performed, but an injection molding technique such as gas injection or water injection may be applied.

In the above-mentioned flow path manufacturing method, the cylinder temperature at the time of molding is preferably 270 to 320 ° C, more preferably 290 to 310 ° C, from the viewpoint of obtaining a molded article having excellent smoothness, dimension retention and dimensional accuracy.
In addition, the mold temperature during molding is preferably 50 to 130 ° C, more preferably 80 to 120 ° C, from the viewpoint of obtaining a molded article having excellent smoothness, dimensional retention, and dimensional accuracy.

  The flow path may be configured by joining a plurality of parts, for example. For example, you may join a cover part and a case part, or may join with piping. In this case, the bonding method may be bonding using adhesives, fastening with screws, or direct resin welding using ultrasonic welding, hot plate welding, vibration welding, laser welding, etc. for the purpose of preventing leakage Alternatively, a joining method using O-ring, packing, press fitting, or the like may be used.

  The structure of this embodiment has the above-mentioned flow path through which a viscous fluid flows. The structure according to the present embodiment may have one or a plurality of the flow paths.

  The structure of the present embodiment may have a structure other than the flow path. Examples of the structure other than the flow path include a pipe, a pump, an aspirator, an orifice, a branch pipe, and a merge pipe.

  The structure other than the channel may be made of the resin composition, or may be made of a resin composition different from the resin composition, a metal, a mixture thereof, or the like.

  The structure of the present embodiment may be, for example, a structure having an inlet and an outlet, or a structure having no inlet and an outlet in which viscous fluid circulates through the flow path in the structure. May be.

  The structure of the present embodiment has, for example, an orifice, an aspirator, a siphon, a piston, a valve, a groove, and a branch channel from the viewpoint that the amount of viscous fluid flowing and / or the pressure of the viscous fluid can be adjusted more accurately. (Branch pipes, branch grooves, etc.), merged channels (merge pipes, merge grooves, etc.), pumps, orifices, etc., from the group consisting of pumps, aspirators, orifices, branch pipes / grooves, and merge pipes / grooves. It is preferably at least one selected.

  For example, when the entire structure is made of a resin composition, the structure according to this embodiment can be manufactured by a method such as molding by the same method as that for the flow path. The whole may be molded and manufactured at one time, or may be molded and joined for each part. Moreover, when there exists components consisting of other than a resin composition, you may join and manufacture using an adhesive agent etc.

  Examples of the viscous fluid include a Newtonian fluid that generates a flow by an external force such as water, oil, and alcohol, a non-Newtonian fluid such as a polymer fluid, and a fluid to which a pressure higher than atmospheric pressure is applied.

  Applications of the structure of the present embodiment include, for example, various pumps, valves, actuators, measurement sensors, tubes, filters, manifolds, containers, and the like.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these Examples at all.

The raw materials used in the examples and comparative examples are as follows.
(A) Polyphenylene ether poly (2,6-dimethyl-1,4-phenylene ether) (trade name “S201A”, manufactured by Asahi Kasei Corporation)
(B) Styrene resin High impact polystyrene (HIPS) (trade name “H9302”, manufactured by PS Japan, rubber reinforced polystyrene)
Homopolystyrene (PS) (trade name “PS685”, manufactured by PS Japan Ltd.)
(C) Filler Fibrous inorganic filler (trade name “ECS03-T747”, manufactured by Nippon Electric Glass Co., Ltd.)
Other components Thermoplastic resin (trade name "Zylon (registered trademark) DG235", manufactured by Asahi Kasei Corporation, PPS / PPE resin)
Thermoplastic resin (trade name “Leona® 14G50”, manufactured by Asahi Kasei Corporation, polyamide 66 resin)
Thermoplastic resin (trade name “Torelina (registered trademark) A505D7”, manufactured by Toray Industries, Inc., polyphenylene sulfide resin)

(Examples 1-6 and Comparative Examples 1-5)
(Preparation of resin composition)
Using a twin screw extruder (trade name “ZSK-26MC”, manufactured by Coperion (Germany)), the cylinder temperature was set to 320 ° C. upstream to 280 ° C. downstream. According to the ratio of Table 1, (A) component, (B) component, and other components were supplied from the upstream supply port, (C) component was supplied from the downstream feeder, and it melt-kneaded.
In addition, the screw rotation speed at this time was 300 rotations / minute, and the discharge amount was 15 kg / h. Further, an opening (vent) was provided in the block immediately before the center of the cylinder block, and residual volatilization was removed by suction under reduced pressure. The degree of vacuum (pressure) at this time was 60 mmHg. The strand extruded from the die was cooled and continuously cut with a cutter to obtain a resin composition pellet having a length of about 3 mm and a diameter of 3 mm.
The following evaluation was performed using the obtained resin composition pellets. The results are shown in Table 1.

(Evaluation)
(Smoothness)
Using Examples 1 to 3, and Comparative Examples 2 to 3 and 5, using a molding machine (trade name “EC60” manufactured by Toshiba Machine Co., Ltd.), the cylinder temperature was set to 300 ° C. and the mold temperature was set to 75 ° C. In Examples 4 and 6, the cylinder temperature was set to 260 ° C. and the mold temperature was set to 50 ° C. In Comparative Examples 1 and 4, the cylinder temperature was set to 280 ° C. and the mold temperature was set to 75 ° C. Five flat plates of × 60 mm × 3 mm thickness were formed with a 1 mm film gate.
Using a surface roughness meter (trade name “Surfcom”, manufactured by Tokyo Seimitsu Co., Ltd.), each flat plate was measured according to JIS B 0601 (2004) for a distance of 5 mm in length of the smoothness measuring portion 4 shown in FIG. The surface roughness (Ra) (μm) was measured according to the standard, and the average value of the surface roughness of the five flat plates was defined as smoothness (μm).

(Dimension retention after immersion in water at 110 ° C. for 1000 hours)
In Examples 1 to 3, 5 and Comparative Examples 2 to 3, 5 using a molding machine (trade name “EC60”, manufactured by Toshiba Machine Co., Ltd.), the cylinder temperature is set to 300 ° C. and the mold temperature is set to 95 ° C. In Examples 4 and 6, the cylinder temperature was set to 260 ° C. and the mold temperature was set to 50 ° C. In Comparative Examples 1 and 4, the cylinder temperature was set to 280 ° C. and the mold temperature was set to 75 ° C. Five dumbbell test pieces were molded.
The five ISO dumbbell test pieces were immersed in hot water at 10 ° C. for 1000 hours, and the amount of change in the width dimension of the parallel part of each test piece from the blank was measured to obtain the dimensional retention rate (%). Dimensional retention (%) was obtained for five test pieces, and the average value was taken as dimensional retention (%) after being immersed in water at 110 ° C. for 1000 hours. The dimensional retention was 99.5 with respect to the blank dimension. % (Excellent), 98% or more ○ (good), and less than 98% x (defect)

(Sleigh (dimensional accuracy))
Using Examples 1 to 5 and Comparative Examples 2 to 3 and 5, using a molding machine (trade name “EC100SX”, manufactured by Toshiba Machine Co., Ltd.), the cylinder temperature was set to 300 ° C. and the mold temperature was set to 95 ° C. In Examples 4 and 6, the cylinder temperature was set to 260 ° C. and the mold temperature was set to 50 ° C. In Comparative Examples 1 and 4, the cylinder temperature was set to 280 ° C. and the mold temperature was set to 75 ° C., and 150 mm Five flat plates with a thickness of × 150 mm × 2 mm were formed.
Using the three-dimensional measuring machine (trade name “AE122”, manufactured by Mitutoyo Corporation), a virtual plane is set from the 15 points (A to O) shown in FIG. The deviation in the axial direction was measured and this was taken as the amount of warpage (mm). The warp is defined as the difference between the maximum value and the minimum value of the distance in the Z-axis direction from the virtual plane at A to O, and the smaller the value, the better the dimensional accuracy. Warpage was measured for five flat plates, and the average value was taken as warpage (mm).
A warp of 3 mm or less was judged as ◯ (good), and a warp exceeding 3 mm was judged as x (defective).

(Dimension retention after leaving for 2 days at 23 ° C. and 50% RH)
Five flat plates produced in the same manner as the above smoothness were left in a temperature-controlled room at 23 ° C. and 50% RH for 2 days, and then the length (length in the TD direction) of the dimension retention rate measurement portion 5 shown in FIG. ) Was measured, and the dimensional retention rate (%) with respect to the dimension at the same position of the mold was measured.
Measurement was performed on five flat plates, and the average value was defined as the dimensional retention rate (%) after being left at 23 ° C. and 50% RH for 2 days.

  The structure of this embodiment can be suitably used as various pumps, valves, actuators, measurement sensors, tubes, filters, manifolds, containers, and the like.

1 Flow path 2 Inlet 3 Outlet 4 Smoothness measurement part 5 Dimension retention measurement part

Claims (4)

A structure comprising a flow path,
A part of the structure constituting at least a part of the flow path includes (A) polyphenylene ether resin, (B) styrene resin, and (C) filler, and (A) polyphenylene ether resin and (B) It consists of a resin composition containing 20 to 70 parts by mass of (C) filler with respect to 100 parts by mass in total with the styrene-based resin,
A structure having a surface roughness of a part of the structure of 0.1 to 1.5 μm.   The structure according to claim 1, wherein a dimensional retention after part of the structure is immersed in water at 110 ° C. for 1000 hours is 98% or more.   (C) The structure according to claim 1 or 2, wherein the filler is a fibrous inorganic filler.   The structure according to any one of claims 1 to 3, wherein the structure is one selected from the group consisting of a pump, an aspirator, an orifice, a branch pipe / groove, and a merge pipe / groove.

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