JP2013234404A - Rotor shaft supporting disk for open-end fine spinning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor shaft supporting disk for a rotor-type open-end fine spinning machine that continuously pulls out, twists and forms a yarn at a high-speed while reconstructing a fiber bundle into a uniform fiber layer by a centrifugal airflow of a high-speed rotator, and specifically a manufacturing technology of a disk maintaining and supporting a rotor shaft rotating at a high speed for the rotor-type open-end fine spinning machine.SOLUTION: There is provided a disk supporting a rotor shaft of a rotor-type open end fine spinning machine, in which the peripheral edge surface is adhesively covered with a rubber member through an adhesive. The rubber member is formed by peroxide-vulcanizing hydrogenated nitrile rubber (HNBR) containing 18 to 44 wt.% of bonded acrylonitrile and/or a modified product thereof.

Description

  The present invention relates to a rotor shaft support disk of a rotor type open-end spinning machine in which a fiber bundle is continuously restructured into a uniform fiber layer by a centrifugal air current of a high-speed rotating body, and continuously twisted, twisted and formed at a high speed. More specifically, the present invention relates to a novel high-performance disk that holds and supports a rotor shaft that rotates at high speed in a rotor-type open-end spinning machine.

The rotor type open-end spinning machine is a spinning machine based on the principle as shown in FIG.
That is, the rotor shaft (16) is brought into contact with the driving belt (20) which is stretched at an appropriate tension by the tension pulley (21) and is moving at a high speed, and is rotated at an ultra high speed of 100,000 times or more per minute. The rotor shaft (16) is composed of a standard type set disc having a pair of surfaces coated with hard rubber, a so-called working set disc (13) and a so-called reflector type set disc (14) having a function of measuring the rotational speed. It has a supporting structure.

  As shown in FIG. 7, the standard set disk (13) is a disc-shaped standard type single disk having a rubber member whose surface is precisely finished on the left and right shaft portions (12) of the fixing bearing (9) at the peripheral portion. Two so-called reflector type assembled discs (14), in which two (10) pieces are inserted with high precision so that the circumferential runout is minimized and the other rotational speed measuring function is waited, are also precisely finished on the surface. A disc-shaped standard type single disk (10) having a rubber member at the peripheral edge and a reflector disk as shown in FIG. 5 having a function of measuring the number of rotations after finishing the surface rubber, or as shown in FIG. 7 (11). -The disc with the reflective hole is inserted with high precision so that the circumferential runout is minimized.

In addition, each single-piece disc is attached to the periphery of each core metal (1), (5), (7) via an adhesive as shown in FIGS. 1, 2, 3, 4, 5, and 6. A hard rubber member is adhesively coated, and after finishing to a certain size, in order to prevent the rubber member central portion from being deformed by the heat generated during high-speed rotation and the rotor shaft from vibrating, the rubber member central portion has a width of 1 mm, A groove with a depth of about 1 mm is processed.
Actually, as shown in FIG. 9, two sets of set disks (13) and (14) or (15) are set in a fixed set disk unit (17), and a rotor shaft (16) is further mounted on the set shown in FIG. Built in.

  As shown in FIG. 10, the rotor type open-end spinning machine is fed with a fiber bundle from a hole (19) at a position behind a rotor shaft (16) that rotates at a high speed of 100,000 to 150,000 times per minute. The fiber bundle reconstructed homogeneously by the centrifugal airflow of the rotating body has a mechanism that spins various yarns at a high speed while applying a constant twist from the front (18), depending on the type of spinning fiber. It is a mechanism that is supported by a pair of two discs coated with hard rubber so that they can be easily replaced with rotor shafts having different outer diameters and shapes.

For this reason, these two discs for supporting the rotor shaft absorb and attenuate the vibration of the rotor shaft that rotates at an ultra-high speed, so that the rubber surface is not deformed by the weight of the rotor shaft. In addition, there is a need for a rubber member that is a hard rubber material and has vibration damping characteristics at high speed, wear resistance, and oil resistance. However, it is usually necessary to reinforce with a filler in order to make it a hard rubber material of about 90 degrees with a type A durometer hardness. It is known that almost no attenuation characteristics can be expected. However, the only material that can eliminate the above-mentioned drawbacks is that polyurethane rubber can be a very hard rubber member without filler, and at the same time, sufficient strength and rubber elasticity can be maintained. There was something known in this field.

For this reason, in the rotor type open-end spinning machine, since there was no option to adopt other rubbers from the beginning of development, this support disk was coated with high-hardness polyurethane rubber with a type A durometer hardness of about 90 degrees on the surface. Adhesive coated discs are used, and single discs (10) and (11) that have been precisely finished after coating are fitted with high precision into dedicated bearings (9) so that circumferential runout during rotation is minimized. Things have been used up to now.
Since this support disk continuously supports a rotor shaft that rotates at a high speed of 100,000 times or more per minute for several months, it is said that its environmental temperature will be as high as 70 ° C. When used under a high load, it is not uncommon for a plastic flow state to occur at 90 ° C. to 130 ° C., and most of them melt at 150 ° C. to 200 ° C. (Non-patent Document 1).

  From the above situation, the usable temperature range of general polyurethane rubber is limited to about 80 ° C, and the support disk of the rotor type open-end spinning machine is always used near the upper limit of the usable temperature limit of polyurethane rubber. Special heat-resistant, high-hardness polyurethane rubber material that is said to be the most heat-resistant polyurethane rubber to ensure safety during continuous operation, because the risk of melting the rubber surface is extremely high Many manufacturers have adopted.

More specifically, the polyurethane rubber used by many manufacturers and said to have the best heat resistance is a polyurethane rubber (trade name: Vulkollan) developed in Germany in 1973. In this polyurethane rubber, the isocyanate component is changed from tolylene diisocyanate (TDI) or methylene diisocyanate (MDI) used in general polyurethane rubber to naphthylene diisocyanate (NDI) having a naphthalene ring with good heat resistance. Moreover, since this NDI is blended in a large amount, it is said that it is one of the strongest heat-resistant polyurethane rubbers existing in the field since it has extremely good heat resistance and wear resistance and is very tough.
Incidentally, a manufacturer that manufactures a support disk for a rotor type open-end spinning machine using this special heat-resistant high-hardness polyurethane rubber member guarantees a durable life of about 2 years in its product catalog.

However, despite the fact that each manufacturer that uses this special heat-resistant, high-hardness polyurethane rubber member guarantees a long service life, there are many cases where the product actually has a short life. The reason is that even with this special heat-resistant high-hardness polyurethane rubber member, which is said to have the best heat resistance, when it reaches a certain high temperature, as with other types of polyurethane rubber, its molecular structure avoids melting. This is due to the inferior heat resistance inherent in polyurethane rubber. In general synthetic rubber, polyurethane rubber is a major feature and a disadvantage as compared with the case where it is carbonized and decomposed without melting even when exposed to high temperatures.
Due to the disadvantages of this polyurethane rubber, if the rotor shaft shakes for some reason, or if slip occurs between the rotor shaft and the support disk, they will rotate at an extremely high speed instantly due to the super high speed rotation. Friction heat is generated and the interface becomes extremely hot, and even in a special heat-resistant high-hardness polyurethane rubber member, the accidental accident that the coated rubber surface partially melts and becomes defective frequently occurs.

Furthermore, these polyurethane rubber members have poor heat-resistant adhesion to the support disk core, and the support disk itself is theoretically coated at least on its surface because it rotates at an ultra-high speed of 30,000 times or more per minute. An incredible amount of centrifugal force of 10,000 times or more of the rubber weight acts, and the centrifugal interface pulls the adhesive interface between the rubber and the core metal with a strong force of 20 kg / cm ² or more. Since the adhesive force is further lowered due to high temperature, there is a problem that if there is a weak spot on the adhesive surface, the rubber member is instantaneously destroyed and operation becomes impossible.

For this reason, in order to make up for the shortage of adhesive strength as much as possible, each manufacturer has increased the surface of the adhesive as shown in (34) of FIG. An attempt has been made to improve the adhesive strength by applying pressure between the polyurethane rubber and the metal core using a high pressure LIM molding machine dedicated to polyurethane rubber (Patent Document 1).
Furthermore, this open-end spinning machine is often used in combination with a normal ring spinning machine at a spinning factory, and short fibers that could not be used for ring spinning can be spun by this open-end spinning machine. As a result, so-called banned or contaminated raw cotton is used, so to speak, ineffectively, they adhere to the surface of the support disk or rotor shaft, and the polyurethane rubber surface may be damaged before the target life. At present, many short-life support disks that melt or occur have also occurred.
In addition to the problems described above, the polyurethane rubber members currently used have significant problems due to their chemical structure.
That is, as is well known, there are two types of polyurethane rubbers classified by their polyol components: ester polyurethane rubbers and ether polyurethane rubbers. Ether polyurethane rubbers have poor oil resistance and are contained in spun fibers. Only the ester-based polyurethane rubber having oil resistance is used exclusively.
However, the ester-based polyurethane rubber is inferior in hydrolysis resistance, and even if it is not used, it usually undergoes hydrolysis in about 4 to 5 years, changes from a rubber state to cheese, and becomes unusable.
Therefore, even if it is an unused support disk, it has a problem that it cannot be stored for a long time, and the user of the support disk knows that there are these uneconomical characteristics and uses it darely. The current situation is.

US Pat. No. 4,676,673

Basics of rubber technology 77-79, 84-85, Japan Rubber Association, issued April 30, 1992

  Accordingly, an object of the present invention is to provide a support disk made of polyurethane rubber using a conventional special heat resistant high hardness polyurethane rubber (trade name: Vulkollan, hereinafter simply referred to as heat resistant polyurethane rubber) member or the like. Depending on the situation, the heat resistance will decrease and melt and become unusable. To prevent extra costs such as re-purchasing and repairing, the same level of hardness as the heat-resistant polyurethane rubber member will be applied every minute. Good vibration absorption at tens of thousands of ultra-high speed rotations, good work efficiency made of specially formulated hydrogenated nitrile rubber with excellent heat resistance, anti-aging resistance, wear resistance, and oil resistance, and support that never melts To develop a disc.

Butyl rubber, which is widely used as various vibration-proofing materials, has low rubber elasticity and a large viscosity tanδ, which is a measure of the viscosity term of the viscoelastic component of the rubber, and therefore can absorb vibrations and be exchanged for thermal energy. For this reason, for example, when butyl rubber is vibrated at a low frequency of about 50 Hz with a device for measuring the dynamic characteristics of rubber such as a flexometer, the viscosity term is high, so the vibration energy is changed to heat in a few minutes and self-heats and burns. There is also a case to put out. Thus, it is most important for tan δ to be small for absorbing vibrations in the high-speed / high-frequency region band. For this reason, the rotor shaft of this rotor-type open-end spinning machine is supported and rotated at 100,000 times or more per minute. The support disk must have a function to prevent vibrations of ultra high frequency that cannot be considered in general industrial machines, such as 30,000 revolutions per minute and 500 revolutions per second, that is, 500 Hz or more. In order not to replace it, it is necessary to coat the surface with rubber having high hardness and at the same time high elasticity.

However, the only rubber material that satisfies these conditions is known in the conventional rubber compounding technology and the current compounding technology.
For this reason, the support disk of this rotor-type open-end spinning machine has been using polyurethane rubber from the early stages of development, and after knowing that each manufacturer has a problem with heat resistance, the results of trial and error, It is said that many manufacturers use the most excellent heat-resistant polyurethane rubber for the support disk at the present time.
However, even if this highest performance heat-resistant polyurethane rubber is used, it is also known that the heat resistance is still insufficient when the use conditions are bad, and the trouble that the rubber surface heat-melts frequently occurs. .

Therefore, the problem to be solved by the present invention is not only good vibration absorption and vibration proofing even when used at an ultra-high speed rotation of 30,000 times or more per minute, similar to the above heat-resistant polyurethane rubber. Even if the rotor shaft is swung due to the abnormal friction between the rotor shaft and the support disk, high heat is generated instantaneously. It is the development of a reasonably high safety support disk with good production efficiency that does not age or melt at all, and does not cause any abnormalities on the rubber surface.
By using this rotor shaft support disk of the present invention, the life of the support disk can be used continuously until the rubber surface wear reaches a certain allowable amount. It is possible to realize a product that can be used up to the design lifetime.

  As a result of intensive studies to achieve the above object, the present inventor, as a rotor shaft support disk, is a hydrogenated nitrile rubber (hereinafter also referred to as HNBR) of 18 to 44% by weight of bonded acrylonitrile and / or. We developed a rotor shaft support disk for a rotor-type open-end spinning machine coated with a rubber member obtained by peroxide-curing the modified product.

  The rubber member used in the present invention is a hydrogen nitrile rubber (HNBR) having a bonded acrylonitrile content of 18 to 44% by weight and a hydrogenation rate of 90% or more and / or a modified product thereof. As the modified product, rubber or methacrylic acid containing 20 to 120 parts by weight of zinc methacrylate and / or zinc acrylate with respect to 100 parts by weight of hydrogenated nitrile rubber In addition, carboxyl group-introduced hydrogenated nitrile rubber (sometimes referred to as HXNBR) obtained by hydrogenating a nitrile rubber obtained by terpolymerization of 1 to 10% by weight of acrylic acid can be preferably used.

If the XHNBR carboxyl group content is less than 1% by weight, the crosslinking reactivity is low, and if it exceeds 10% by weight, the reaction rate due to the carboxyl group is too fast and the crosslinking reaction proceeds at room temperature, so-called scorch (rubber burn phenomenon) ) Are likely to occur, and dynamic elasticity and tensile strength, which are physical properties necessary for the support disk, may be reduced.
Hydrogenated nitrile rubber with a hydrogenation rate of 90% or more is excellent in heat resistance and aging resistance, and hydrogenated nitrile rubber with a hydrogenation rate lower than that has a heat resistance and aging resistance due to remaining double bonds. It is not a preferred material for use in the present invention because it decreases rapidly.

When a rotor shaft support disk is made using a so-called ultra-high nitrile hydrogenated nitrile rubber with an amount of bonded acrylonitrile exceeding 44% by weight, a disk with good oil resistance can be obtained, but a guideline for absorbing vibration of the rotor shaft In some cases, it is difficult to sufficiently increase the rubber elasticity of the core, and the vibration of the rotor shaft rotating at a high speed of 100,000 times or more cannot be suppressed.
On the other hand, when the amount of bound acrylonitrile is less than 18% by weight, the oil resistance decreases, so that the rubber swells due to the oil contained in the spun fiber, resulting in a decrease in rubber strength and rubber hardness. is there.

In addition, there are two methods for vulcanizing hydrogenated nitrile rubber: sulfur vulcanization compounding and peroxide vulcanization compounding. When a rotor shaft support disk made of hydrogenated nitrile rubber is formed by sulfur vulcanization compounding Since the rubber elasticity is remarkably lowered, there is a possibility that the vibration of the rotor shaft rotating at a high speed of 100,000 times or more cannot be suppressed.
Further, the hydrogenated nitrile rubber used in the present invention is a rubber member made of peroxide vulcanization in which 20 parts to 120 parts of zinc methacrylate and / or zinc acrylate are blended with 100 parts of hydrogenated nitrile rubber. Can be preferably used from the viewpoint of durability, and in place of the above-mentioned zinc methacrylate and zinc acrylate, zinc dimethacrylate and zinc diacrylate can be used in the same manner. Can also be used together.
Similarly, carboxylic acid NBR (hereinafter referred to as XNBR) in which a ternary copolymerization of acrylic acid or methacrylic acid is introduced as a third component of a nitrile rubber (hereinafter also referred to as NBR), and a carboxyl group is introduced into the side chain or terminal. HXNBR obtained by hydrogenation can also be preferably used from the viewpoints of durability and improvement in adhesive strength with the core.

  In addition, although the technique of mix | blending the said zinc methacrylate etc. with hydrogenated nitrile rubber and the technique of terpolymerizing acrylic acid or methacrylic acid as a 3rd component of NBR are known until now, of the rubber | gum obtained there As for performance, it has been clarified that it exhibits rubber elasticity and high strength, and is a performance required for the rotor shaft support disk of the rotor type open-end spinning machine of the present invention. The present inventors have found for the first time an excellent characteristic regarding the property.

Furthermore, how much hydrogenated nitrile rubber has a combined amount of bonded acrylonitrile or how much compounded amount of zinc methacrylate, etc. is excellent in vibration absorption and wear resistance of this rotor shaft. It is not known at all about the performance and the influence on the characteristics of the rotor shaft support disk, and it can be said that this is the first attempt that has not been considered in the technical field of the present invention, that is, the rotor type open-end spinning machine industry. Peroxide-vulcanized hydrogenated nitrile rubber blended with zinc methacrylate or zinc acrylate and hydrogenated HXNBR are, for example, Asahi Carbon's Carbon Black Seast S (trade name) and Nippon Silica Nipseal VN3 (product) Name) From peroxide vulcanized hydrogenated nitrile rubber compounded with other reinforcing fillers such as white carbon Not only strong, when the rubber elasticity good many, stably for a long period of time it can be used since the vibration preventing property and the rotor shaft supporting the rotor shaft rotating at a high speed is good.

  The rubber member used in the present invention is a type A durometer hardness (hereinafter simply referred to as a type A durometer hardness) measured by a measurement method of spring type hardness (durometer hardness) at 25 ° C. according to JIS K6253. Is a peroxide vulcanized rubber member having a Type D durometer hardness of 68 degrees or less, and JIS K0064: Melting point and melting point measurement method for chemical products (US Pharmacopoeia) (USP), melting point measurement method based on European Pharmacopoeia (EP) melting point measurement method) does not melt even at 400 ° C., type A durometer hardness is 90 degrees or more, and type D durometer hardness is 68 degrees Further, the ambient temperature is 80 ° C. and the frequency is 6 in a bending vibration test method in accordance with JIS K-7244-5 (ISO 6721-5). tanδ as measured at Hz can be preferably used rotor shaft support disc coated formed using a rubber member, characterized in that more than 0.15.

When tan δ is 0.15 or less, the generation of heat due to vibration is small, so that there is little vibration during high-speed rotation even in a usage mode used for a long time like the rotor shaft support disk of the present invention. Therefore, it can be used more preferably.
Further, the rubber member used in the present invention has no melting point, and the rubber surface does not melt even at a high temperature of 400 ° C. or higher. Therefore, even if high heat is generated due to friction for some reason, the rubber member can be used as it is. A time margin for dealing with troubles such as slip between the shaft and the support disk can be secured.

When the rubber hardness of the above-mentioned peroxide vulcanized rubber member is less than 90 degrees in Type A durometer hardness, it is too soft so that the rotor shaft support function is poor and the durability is also poor, and the rubber hardness is Type D durometer hardness. In the case of 68 degrees or more, even if tan δ is 0.15 or less, it is too hard and the support function of the rotor shaft is deteriorated, and the rotor shaft cannot be stably supported for a long time.
In the present invention, the rubber hardness of the disc is defined by two types of measurement methods, Type A durometer hardness and Type D durometer hardness, as is done in normal measurement of rubber hardness.

  Specifically, the rubber hardness of the disk of the present invention is such that the type A durometer hardness is 90 degrees or more, the type D durometer hardness is preferably 68 degrees or less, and particularly the type A durometer hardness is 95 to 98. Those having a degree of hardness are preferred. If the hardness is less than 90 degrees, the amount of deformation on the rubber surface increases due to the weight of the rotor shaft, which not only reduces the wear resistance and shortens the life, but also makes it difficult to absorb vibration and the spun yarn quality. It may cause inconvenience such as lowering. On the other hand, when the type D durometer hardness is more than 68 degrees, it may be difficult to absorb the vibration and the spun yarn quality may be deteriorated.

The rotor shaft support disk having particularly good durability is a rubber member or HXNBR member in which the hydrogenated nitrile rubber peroxide vulcanization compound is further improved and 20 parts or more of (meth) acrylic acid zinc salt is compounded. However, even in that case, more preferable performance can be obtained if the hardness range of rubber hardness and the numerical range of tan δ are in the above ranges.
It has been known that hydrogenated nitrile rubber peroxide vulcanizate has higher elasticity than sulfur vulcanizate, but focusing on specific hydrogenated nitrile rubber, this hydrogenated nitrile rubber rotates at high speed. The present inventor was the first to find that the present invention showed particularly excellent performance in vibration absorption, and this discovery was the beginning of the present invention.

  As described above, the present invention in which the hydrogenated nitrile rubber and / or modified acrylonitrile content and peroxide vulcanization are selected, and the present invention in which the rubber hardness range, elasticity, and tan δ range are selected as a preferred embodiment, For the rotor-type open-end spinning machine industry, it can be said that this is an epoch-making technical advance that marks an era since the development of the rotor shaft support disk made of special heat-resistant high-hardness polyurethane rubber.

Even if the rotor shaft support disk of the present invention has a slight runout due to the inconvenience when it is inserted, the support disk of the present invention has extremely excellent heat resistance and wear resistance, so that the rubber surface has frictional heat. It can be used as it is if it is removed and the runout is corrected again without melting or wearing.
On the other hand, in the heat-resistant polyurethane rubber support disk used in most current rotor-type open-end spinning machines, if there is a runout due to inadequate insertion when the bearing is inserted, The excellent effect of the present invention can also be confirmed from the fact that the surface immediately melts, the support disk becomes unusable, and there is no corresponding means other than replacement with a new product.

In addition, when the low quality raw cotton collected from ring spinning and cotton wool is used effectively, or when using raw cotton with a lot of sneak and contamination, the rotor shaft and the support disk may become dirty. The rotation of the rotor shaft becomes unsmooth, and even if the conventional polyurethane rubber disc is made of heat-resistant polyurethane rubber, the rubber surface melts and becomes unusable.
On the other hand, the support disk of the present invention has excellent heat resistance and the rubber surface does not melt, so it is safe to remove the rotor shaft and the support disk from the unit and clean them, so that they can be used again. Can operate.

  Furthermore, the adhesive coating of the hydrogenated nitrile rubber member of the present invention employs press molding and pressurizes the rubber member and the core metal through a high-heat-resistant adhesive under high pressure, so the strength of the bonding surface is extremely strong. This is another feature. The current heat-resistant polyurethane rubber disc has extremely weak heat-resistant strength on the adhesive surface, and a liquid polyurethane component is bonded using an injection machine under normal pressure. Compared with having a problem with the adhesive force at the interface, the rotor shaft support disk of the present invention also has the advantage that it can be used more safely and has excellent heat resistance, so the conventional heat resistant polyurethane rubber support disk Can be used more economically.

  In addition, the rotor shaft support disk of the present invention can be manufactured by press molding in the same manner as general synthetic rubber materials, and the mold release time is long because the molding material is mainly molded by injection molding. Unlike the so-called heat-resistant polyurethane rubber discs, a large amount of material can be removed from the press die in a relatively short period of time by selecting the proper hot plate temperature and composition of the press and the number of molds. It can be manufactured by molding, and can be mass-produced and sold at a reasonable price comparable to or less than heat-resistant polyurethane rubber discs.

It is a front view of a standard type rotor shaft support single article disk. It is side surface sectional drawing of a standard type rotor shaft support single-piece | unit disk. It is a front view of a laser measurement type rotor shaft support single article disk. It is side surface sectional drawing of a laser measurement type rotor shaft support single-piece | unit disk. It is a front view of a reflector type rotor shaft support single article disk. It is side surface sectional drawing of a reflecting plate type rotor shaft support single-piece | unit disk. It is a perspective view at the time of inserting a standard type rotor shaft support set disc and a laser reflection type rotor shaft support set disc. It is an external appearance slope view of a pair of new and old two types of rotor shaft support set discs and a rotor shaft. FIG. 5 is a perspective view when a pair of rotor shaft support set disks and a rotor shaft are set in a disk fixing unit. It is a slope schematic diagram of the whole rotor shaft support twin disk device. FIG. 4 is a completed view of a rotor shaft support assembly disk fitted in a bearing. It is a slope view of the whole simple melting point measuring device. It is a schematic diagram of an example of the disk in which the polyurethane rubber surface was melted during use. It is a cross-sectional schematic diagram of an example of the rotor shaft support disk which expanded the adhesion area of a polyurethane rubber and a metal core.

Hereinafter, the present invention will be specifically described.
The rotor shaft support disk referred to in the present invention means two single-piece support disks (13) and (14) or (15) used in a rotor type open-end spinning machine as shown in FIG. 10) and (11) (refer to FIG. 7), and each of the core bars (1), (5) or (7) as shown in FIG. 1, FIG. 2, FIG. 3, FIG. A disc-shaped single disk obtained by applying a high-hardness rubber member (2) as defined in claims 1 to 5 of the present invention to the peripheral edge with an adhesive, followed by precision machining to a certain size.

Next, the rotor shaft support disk of the present invention will be specifically described with reference to the drawings.
As shown in FIGS. 1 and 2, the standard type single disk (10) has an aluminum cored bar (1) having a hole for fixing the bearing (9) at the center as shown in FIG. ˜5, a hard rubber member (2) defined by adhesive coating, and precision processed and finished to a certain size, or a rubber member surface central portion 0.5 to 1.0 mm in width and 0.5 to 0.5 mm in depth. Finish a groove of about 1.0mm.

  There are two types of discs for rotational speed measurement, as shown in FIGS. 8A and 8B. In the case of a single disk for the device (B) that reflects the laser beam and measures the rotation speed, an aluminum core bar having a hole for fixing the bearing (9) at the center as shown in FIGS. 5) a disc hardened with a high-hardness rubber member (2) as defined in claims 1 to 5 via an adhesive at the peripheral edge and finished with precision machining to a certain size, or a width 0 at the center of the rubber member surface thereafter Finish a groove with a depth of about 5-1.0 mm and a depth of about 0.5-1.0 mm.

In the case of a single disk for the device (A) that measures the number of revolutions using a reflector, an aluminum cored bar having a hole for fixing the bearing (9) in the center as shown in FIGS. A disk in which the peripheral edge of (7) is coated with a high-hardness rubber member (2) defined in claims 1 to 5 via an adhesive and finished with precision processing to a certain size, or a width 0 at the center of the rubber member surface thereafter. Finish a groove with a depth of about 5-1.0 mm and a depth of about 0.5-1.0 mm.
In the rotor shaft support disk of the present invention, the hard rubber (2) to be coated is a peroxide vulcanization using a certain amount of a compounding agent so as to impart a high hardness / high elasticity compounding to a specific hydrogenated nitrile rubber component. Use hydrogenated nitrile rubber.

The hydrogenated nitrile rubber component comprises a high-hardness, high-elasticity peroxide vulcanized hydrogenated nitrile rubber in which a certain amount of zinc methacrylate or zinc acrylate is blended. As the specific hydrogenated nitrile rubber component, hydrogenated nitrile rubber having a combined acrylonitrile content of 18 to 44% by weight is used. Specifically, Zeonpol 2000, 2010, 2011, 2020, 2030, 3300, 3110, (Product name), Lanvins A3406, A3407, A3607, C3446, C3467, B3627, (Product name), etc. An example of HXNBR is Telvan XT VP KA 8889 (trade name) of LANXESS Corporation.
Also, hydrogenated nitrile rubber manufacturers themselves can use commercially available HNBR products containing methacrylic acid / acrylic acid in which zinc methacrylates or zinc acrylates are dispersed in their own hydrogenated nitrile rubber, for example, Telban XQ536. (Product name) can be exemplified.

The following compounding agents can be illustrated as a rubber reinforcing agent.
First, all kinds of reinforcing carbon black can be used as carbon black, that is, SAF, SAF-HS, ISAF, N-339, ISAF-LS, I-ISAF-HS, HAF, HAF as used in the old classification of carbon black. -Manufactured products such as HS, B-351, HAF-LS, MAF, FEF, FEF-HS, and SRF can be used.
Examples of inorganic reinforcing agents include general high activity and medium activity dry and wet white carbons such as Nipsil VN3, Ultrazil VN3 (manufactured by Nippon Silica), Zeosil 500V (manufactured by Taki Chemical), Ultrazil VN2 (Degussa).・ Evonik) and Aerosil R972
And Aerosil R974 (manufactured by Toshin Kasei Co., Ltd.).

The organic reinforcing agent may be any NBR or HNBR resin that improves wear resistance. For example, if it is a phenol / formaldehyde resin, Sumilite Resin PR-1286, Sumilite Resin PR-1287 (both manufactured by Sumitomo Jurez), Burka Examples include Joule A, Bruker Joule R3 (both manufactured by Bayer AG, Germany), Taik (manufactured by Nippon Kasei Co., Ltd.), and the like.
As the organic peroxide vulcanizing agent used for the peroxide vulcanization in the present invention, perfume mill D, D40, perhexa 3M, 3M-40, perbutyl P, peroximon F40, perhexa 25B, perhexa 25B-40 ( (Trade name) and Kayakumir D-40K of Kayaku Akzo, Trigonox 29, Trigonox 29/40, Parka Dox 14, Parka Dox 14/40, Kaya Hexa AD, Kaya Hexa AD / 40 (Product Name), Sanken Chemical Co., Ltd. , Sampelox CY-1 · 1, Sampelox TY-1 · 3, Sampelox AHTO (trade name), Rudol Yoshitomi's Rupeloc 500T, 500-40C, Rupazole 231, Rupazole 231-XL, Rupeloc 802, Rupako 802XL, Rupazole 101, Ruperco 101- Examples include XL (product name).

  In addition to the above, rubber crosslinking chemicals such as the general abbreviations TMP, EG, MAAAZn, AAZn can be used as co-crosslinking agents for peroxide vulcanization, and the chemical names are trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, Co-crosslinking agents for peroxide vulcanization such as zinc methacrylate and zinc diacrylate can also be used. The product names include: Sunester EG, Sunester TMP, Sunester SK-30, Sanfel BM-G (above, Sanshin Chemical), Actor ZA, Actor ZMA (above Kawaguchi Chemical Industries), LightEster EG, Lite Ester TMP (above, Kyoei Chemical), Hi-Cross M, Hi-Cross MP, Hi-Cross ED-P, Hi-Cross GT (above, Seiko Chemical Industry), Acryester EG, Acryester TMP (above, Mitsubishi Rayon) (Japanese fats and oils), R-20S (above, Asada Chemical Industry), NSSOB-PB (Nippon Soda), Actor BMR, HVA-2 (DuPont), etc. can be illustrated.

  In the present invention, in consideration of processability at the time of molding, a plasticizer and a softening agent can also be included as a compounding agent. However, although their processability is improved by their blending, heat resistance and aging resistance are improved. In addition, the elastic performance may be adversely affected and the performance of the rotor shaft support disk at the time of high-speed rotation may be reduced. Therefore, sufficient attention must be paid to the blending of these components.

Examples of the viscoelasticity measuring apparatus exemplified in this patent include TA Instruments Q800 and RSAIII, A & T Corp. Leo Vibron dynamic viscoelasticity automatic measuring instrument DDV-01FP, 25FPV, and the like.
Moreover, as melting | fusing point measuring apparatus illustrated by this patent, M-560 and M565 by Nippon Buch Co., Ltd., MP-21 by Yamato Scientific Co., Ltd., B-540 and B-545 by Shibata Kagaku Co., can be illustrated.

(About the production method of the present invention)
The rotor shaft support disk of the present invention can be obtained, for example, as follows.
First, an appropriate amount of the hydrogenated nitrile rubber is wound around a roll using a rubber kneading roll or the like, then a vulcanization accelerator, a filler, a processing aid such as stearic acid, and an appropriate amount of white carbon or zinc methacrylate. Or knead zinc acrylate. After these are kneaded well, they are separated from the kneading roll and dumped out. Again, the dumped kneaded dough is finally kneaded with an appropriate amount of peroxide vulcanizing agent to complete the raw rubber dough. Next, the aluminum core bar of FIGS. 1, 2, 3, 4, 5 and 6 prepared in advance is degreased with a solvent, and after applying an adhesive, the solvent in the adhesive is removed. Leave it for a certain period of time to evaporate and stabilize. Thereafter, the cored bar is inserted into a press molding die heated and kept at a constant temperature in the upper and lower hot plates of the press molding machine, and then the kneaded dough is poured into the mold, followed by temperature, pressure and vulcanization. Press molding by pressurizing and heating for a certain period of time. After that, the molded product is taken out from the press die, and the surface, particularly the surface and side surfaces that come into contact with the rotor shaft, are finished to a certain size. Process.
Embodiments of the present invention will be described below with reference to the drawings.

EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but it goes without saying that the present invention is not limited to these examples.
[Example 1]
1000 parts by weight of hydrogenated nitrile rubber with a combined acrylic nitrile of 36% and a hydrogenation rate of 96% is wound around an 8-inch rubber kneading roll and kneaded, and 50 parts by weight of zinc white and 10 parts by weight of stearic acid are aged. An inhibitor, reinforcing carbon black, and other reinforcing agents are kneaded in an appropriate amount by weight and 300 parts by weight of Actor ZMA (Zinc methacrylate manufactured by Kawaguchi Chemical Industry), then separated from the roll and allowed to stand naturally.
Subsequently, the rubber kneaded dough was again wound around a kneading roll, and 60 parts by weight of Park Mill D40 (Nippon Yushi Co., Ltd. peroxide vulcanizing agent) was kneaded to prepare a kneaded dough A. An unvulcanized sheet having a thickness of about 5 mm was prepared from this rubber fabric A using an 8-inch rubber kneading roll.

[Rubber hardness measurement]
An appropriate amount of this unvulcanized rubber sheet was weighed and placed on a flat plate mold kept warm on a hot plate of a 60-ton press for rubber, and press vulcanized at 165 ° C. for 25 minutes to prepare a sheet having a thickness of 2 mm. When this sheet is left in a room at room temperature of 23 ° C. for 6 hours or longer and measured for rubber hardness by a measuring method in accordance with JIS K-6253, the type A durometer hardness is 97 ° and the type D durometer hardness is 56 °. It was.
[Elasticity measurement]
Next, when this sheet was measured by a bending vibration method using a viscoelasticity tester in accordance with JIS K7244-5, tan δ at a frequency of 60 Hz at 80 ° C. was 0.090.

[Measurement of physical properties of molded products]
Next, laser measurement as shown in Fig. 3 (5) with the same dimensions as 8 standard type aluminum cored bars with an outer diameter of 70mm, thickness of 10mm and bearing insertion hole of 10.0mm. A total of 10 core bars with two symmetrical through-holes with a diameter of 8 mm for use were degreased on the day before the press work, coated with an adhesive, and allowed to stand overnight.
Next, two of these cores are set in a two-pressing press mold that is kept warm in a 60-ton rubber press machine whose upper and lower heating plates are controlled at 165 ° C. An appropriate amount of the kneaded dough A dispensed to a thickness of 5 mm was poured, heated for 30 minutes, and pressurized at a constant pressure to prepare 10 press-molded products.
Next, a rubber ring having a width of 4 mm and a thickness of 1.5 mm is cut out from one standard single-piece disc adhesively coated with this press-molded rubber fabric A and cut at 80 ° C. and 60 Hz in the same manner as described above. When tan δ was measured, it was 0.085.

[Measurement of molded product performance]
Next, these press-molded discs are 6 standard discs and 2 laser-type discs with an outer diameter of 78 mm and a width of 10 mm using dedicated jigs and inspection equipment. Finished.
These discs were inserted into four dedicated bearings using a dedicated insertion tool as follows, and No. 1 to No. Four sets of four discs were produced.
No. 1: As shown in FIG. 11C, two standard single discs were fitted on both sides of the bearing so that the left and right side runouts (23) were 0.01 mm or less.

No. 2: As shown in [C] of FIG. 11, a standard single product disc and a laser type single product disc were fitted on both sides of the bearing so that the left and right side runouts (23) would be 0.01 mm or less.
No. 3: As shown in [D] of FIG.
Two standard single-piece discs were inserted so that 3) was about 0.05 mm.
No. 4: As shown in [D] of FIG. 11, either the left or right side runout (2
Standard type single-piece disc and laser type single-piece disc were inserted so that 3) was about 0.05 mm.

[Results of molding product performance measurement 1]
At the first installment, the No. 3 and No. 4 discs with large side deflection were attached to the disc assembly unit (17) of the rotor type open-end spinning machine for several minutes, and the rotor shaft with an outer diameter of 40 mm (16) was attached and rotated at 110,000 times. As a result, the vibration of the unit was large and the rubber surface was very hot. However, neither of the two discs of Example 1 had any change because the rubber surface did not melt or the rubber was damaged.
After that, the two assembled disks are removed from the apparatus, and the right and left touches are fine-adjusted to 5/1000 again using the inspection apparatus, and then attached to the assembled disk fixing unit (17) again. A second rotation test was performed. As a result, the roller assembly rotated smoothly without vibration, and could be used without any problem for more than 3 months.

[Results of measurement of molded product performance 2]
The two assembled discs No. 1 and No. 2 fitted with almost no side deflection were attached to the rotor type fixing unit (17) in the same manner as in the first time of Example 1, and then the rotor shaft having an outer diameter of 40 mm was attached. And rotated at 110,000 times. As a result, no. 1 and No. Similarly to the first round of the first implementation and the first implementation of the first embodiment, the two sets of disks could be used smoothly with almost no vibration of the fixed unit (17). For this reason, it could be used without any problem for more than 3 months.

[Melting point measurement]
In order to measure the melting point of the vulcanized rubber of Example 1, a measuring method based on JIS K0064: melting point and melting point measuring method of chemical products (US Pharmacopoeia (USP), European Pharmacopoeia (EP) melting point measuring method) The melting point was measured simultaneously with Comparative Example 1 and Comparative Example 2.
Specifically, a piece of about 1 cmm square is prepared from the 2 mm thick rubber sheet prepared in Example 1 and Comparative Example 1 and Comparative Example 2 to be described later, and is cut as finely as possible until it becomes a powder with a sharp blade. Then, an appropriate amount is packed in a glass capillary tube having a thickness of about 1.0 mm, a length of about 80 mm, and a thickness of about 0.2 mm, and the three samples are set in a melting point measuring apparatus and heated at a rate of 2 minutes per minute. Each melting point was measured visually. As a result, the two types of finely pulverized urethane rubbers of Comparative Example 1 and Comparative Example 2 were melted at 190 ° C. and 285 ° C., respectively, but the rubber material of Example 1 had a limit temperature of 400 ° C. of this melting point measuring apparatus. However, it was confirmed that it did not melt.
However, although it was the original purpose to confirm the melting point of Example 1, since the melting point measuring apparatus of each existing manufacturer can only measure the melting point up to 400 ° C., the present inventor further shows that FIG. Using the simple measurement method devised by the present inventors, the approximate melting points of Example 1, Comparative Example 1 and Comparative Example 2 were simultaneously measured.

The apparatus used in the simple measurement method will be described. Example: An aluminum round bar (27) having a diameter of 90 mm and a length of 55 mm is placed on a table (26), and the width is about 4 mm, the length is about 6 mm, and the thickness is about 2 mm. 1 vulcanized rubber piece (30), a rubber piece (31) of Comparative Example 1 made of general-purpose polyurethane rubber and a rubber piece (32) of Comparative Example 2 made of heat-resistant polyurethane rubber, which will be described later, each in total, 6 pieces in total As shown in FIG. 12, the pieces are placed alternately and alternately, and the flame (25) of the alcohol lamp (24) is adjusted so that the aluminum round bar is heated to a range of 1 ° C. to 2 ° C. per minute. After heating, a thermocouple measuring part (28) was inserted into a hole provided in the upper center of the aluminum round bar (27), and the approximate melting temperature of each rubber member piece was read and measured with a digital thermometer (29).

As a result, both of the comparative examples 1 made of general-purpose urethane rubber melted neatly at 200 ° C. to 210 ° C. in the form of polka dots, and both of the comparative examples 2 made of heat-resistant polyurethane rubber were neatly rounded at 300 ° C. to 310 ° C. It melted into a shape. However, unlike a synthetic rubber, a general synthetic rubber is said to carbonize and decompose without melting at a high temperature, but Example 1 does not soften or melt even when both of them reach 450 ° C. or higher. Further, since the carbonization decomposition did not occur even at about 500 ° C. of the carbonization decomposition temperature of the hydrogenated nitrile rubber compounded with a general plasticizer, further heating was stopped.
As a result, even this heat-resistant polyurethane rubber, which is said to be the most heat-resistant,
K0064: Compared to the melting point of a chemical product and melting at 285 ° C. according to the measurement method based on the melting point measurement method, the rubber member of Example 1 is at least 100 ° C. higher than heat-resistant polyurethane rubber, and 150 ° C. or higher in simple measurement. It was found that the heat resistance was good and it did not melt at all.

[Measurement of heat aging resistance]
Further, in order to confirm the heat aging resistance of the rubber material of Example 1, the vulcanized rubber sheet of Example 1 having a thickness of 2 mm prepared by press vulcanization at 165 ° C. for 25 minutes and a comparative example described later. A total of three types of the two types of urethane rubber sheets prepared in 1 and Comparative Example 2 were left in an electric furnace set at 150 ° C. for 4 weeks, then removed, and each unaged sheet and 150 ° C. for 4 weeks. At the same time, the heat aging sheets were compared in hardness and tensile strength in accordance with JIS K6253 and JIS K6251.

As a result, when the rubber material of Example 1 was measured for the rubber hardness before the aging test, the type A durometer hardness was 97 degrees, the same hardness after the aging test was 98 degrees, the tensile strength before the aging test was 29 Mpa, and aging It was found that the tensile strength after the test was 31 Mpa and hardly aged.
However, both Comparative Example 1 and Comparative Example 2 were severely aged, and were softened and deteriorated so that both hardness and tensile strength could not be measured.
From the above results, the support disk using the rubber member of Example 1 is different from a conventional urethane disk, even if an unexpected trouble such as fluff sticking to the rotor shaft occurs on operation, It was confirmed that the coated rubber surface not only did not dissolve at all but also had tremendous heat aging resistance and could be operated safely.

[Example 2]
1000 parts by weight of hydrogenated nitrile rubber with a combined acrylic nitrile of 36% by weight and a hydrogenation rate of 96% is wound around an 8-inch rubber kneading roll and kneaded, and then 50 parts by weight of zinc white and 10 parts by weight of stearic acid. In order to adjust Mooney viscosity at the time of press molding and an appropriate amount of inhibitor and reinforcing carbon black, knead 250 parts by weight of heat-resistant plasticizer / Adekasizer CN9 (Asahi Denka Kogyo Co., Ltd.) and then remove it from the roll. And leave it alone.

Subsequently, this rubber kneaded dough was again wrapped around a kneading roll, and 30 parts by weight of Park Mill D40 (a peroxide vulcanizing agent manufactured by NOF Corporation) was kneaded to prepare kneaded dough B. An unvulcanized rubber sheet containing a plasticizer having a thickness of 5 mm was prepared from the rubber fabric C using an 8-inch rubber kneading roll.
Next, using this kneaded dough B, a vulcanized sheet, four standard single discs and two laser type single discs were produced in the same manner as in Example 1, and the runout was 5 as in Example 1. /
Finished to 1000 or less. Then, when various items were measured, the following test results were obtained.

[Rubber hardness measurement]
When the rubber hardness was measured by the same method as in Example 1, the hardness with a Type A durometer was 91 degrees and the Type D durometer hardness was 50 degrees.
[Elasticity measurement]
Further, a rubber ring having a width of 5 mm and a thickness of 1.5 mm was cut from this single disk by cutting, and the bending vibration method tan δ at 80 ° C. and 60 Hz was measured by using a viscoelasticity measuring instrument. It was.

[Measurement of molded product performance]
Next, these press-molded discs were obtained as No. 1 in Example 1 with single-piece discs having a runout of 5/1000 or less as in Example 1. 1 and no. As shown in Fig. 11 [D], each set disc is set so that either one of the side runouts (23) is 5/100 or less using the insertion dedicated jig in the same manner as the two set discs of No. 2. Was placed on the assembled disk fixing unit (17), and a rotor shaft with an outer diameter of 40 mm was attached and rotated at 110,000 times.

As a result, the vibration of the rotor shaft and the unit was slightly larger than that of Example 1, and the rubber surface was hotter than Example 1, but it could be used as a support disk without melting the rubber surface.
From this test result, it was found that if tan δ is 0.15 or less, it can be more preferably used as a support disk.

[Example 3]
Wrap 1000 weights of carboxyl-modified ternary hydrogenated nitrile rubber containing about 5% by weight of carboxyl groups in the molecule and about 33% of acrylonitrile around an 8-inch rubber kneading roll, and knead 50 parts by weight of zinc white. , 10 parts by weight of stearic acid, an appropriate amount of anti-aging agent, reinforcing carbon black and other reinforcing agents are blended in an appropriate amount by weight, and further, an increase in permanent strain due to carboxyl groups in the molecule and a decrease in rubber elasticity are prevented, In order to adjust the hardness, an appropriate amount of triallyl isocyanurate (trade name: TAIC, manufactured by Nippon Kasei Chemical) was added, and the kneaded dough was cut off from the roll. Subsequently, this rubber kneaded dough was again wrapped around a kneading roll, and an appropriate amount of park mill D40 (a peroxide vulcanizing agent manufactured by Nippon Oil & Fats Co., Ltd.) was kneaded to prepare kneaded dough D.

An unvulcanized sheet having a thickness of about 5 mm was prepared from the rubber fabric D using an 8-inch rubber kneading roll, and the subsequent work was performed in the same manner as in Example 1.
As a result, when the rubber hardness is measured, the hardness with a type A durometer is 97 degrees and the hardness with a type D durometer is 56 degrees, and the vibration absorption characteristics, heat resistance, and heat aging characteristics are almost the same as those of the first embodiment. It was confirmed that it had superior performance as compared with the conventional products of Comparative Example 1 and Comparative Example 2.

[Comparative Example 1] (Commercially available polyester / TDI type A hardness / polyurethane rubber using 95 degree prepolymer)
8 aluminum core bars for standard type (1) and 2 aluminum core bars for laser reflection type rotational speed measurement type (5) manufactured according to the same specifications as in Example 1 were each degreased and polyurethane rubber A special adhesive was applied and allowed to stand overnight.
Next, an injection mold was placed on a polyurethane rubber injection hot plate heated to 120 ° C., and a cored bar was placed in the mold and kept warm.

Subsequently, 1000 parts by weight of a polyester / TDI prepolymer composed of 6.2% by weight of NCO in a suitable container was weighed, heated to 80 ° C., and deaerated for 5 minutes while stirring in vacuum. Next, 158 parts by weight of MOCA (methylenebisorthochloroaniline made by Ihara Chemical) is weighed in a metal container suitable as a cross-linking agent, heated and dissolved with an electric heater, and then covered with an aluminum foil in an electric furnace at 110 ° C. for heat insulation. I kept it. Next, add all the MOCA dissolved in this defoamed prepolymer and stir it with a stir bar for 1 minute so as not to entrap air, then set it on the hot plate and for the 2mm flat plate The mixture was poured into an injection mold and left on the hot plate for 1 hour. After the urethane rubber was cured, each injection material was removed from the injection mold and aged for 12 hours in an electric furnace at 110 ° C. Thereafter, the mixture was allowed to stand at room temperature for 2 weeks for further aging.

[Rubber hardness measurement]
When the hardness of this polyurethane rubber sheet was measured in the same manner as in Example 1, the hardness with a type A durometer was 95 degrees and the hardness with a type D durometer was 54 degrees.
[Melting point measurement]
As described in Example 1 above, the melting point of Comparative Example 1 is in accordance with JIS K0064: Melting point of chemical products and melting point measurement method (melting point measurement method of US Pharmacopoeia (USP), European Pharmacopoeia (EP)). As a result, it was found to be 190 ° C. and the heat resistance was considerably poor.
For this reason, even if a polyurethane rubber component manufacturer creates a rotor shaft support disk using this general polyurethane rubber, it melts relatively easily when the rubber surface becomes hot for some reason, and the quality is low. It turns out that only support disk products can be obtained.

[Measurement of molded product performance]
In addition, a total of 6 standard single disk made of polyurethane rubber injection molding disk of Comparative Example 1 and 2 laser reflective type single disk were finished after finishing the surface and side runout accuracy to 5/1000 or less. Using a jig, No. 1 in Example 1. 3 and no. 4, as shown in [D] of FIG. 11, one of the side runouts (23) is fitted in a large state and then installed in the assembled disk fixing unit (17). The shaft was attached and rotated at 110,000 times for several minutes.

As a result, the vibration of the assembled disk fixing unit (17) suddenly increased in just a few minutes, so it was quickly removed, and when the rubber surface of the support disk of Comparative Example 1 was confirmed, the surface was partially melted.
As a result, the support disk using the general-purpose polyester-based polyurethane rubber member of Comparative Example 1 cannot be used immediately unless it is used with care in a state where there is no circumferential runout. It was found that it could not be used until a period of several years guaranteed by.

[Comparative Example 2 (heat resistant polyurethane rubber)]
8 aluminum core bars for standard type (1) and 2 aluminum core bars for laser reflection type rotational speed measurement type (5) manufactured according to the same specifications as in Example 1 were each degreased and polyurethane rubber A special adhesive for coating was applied and allowed to stand overnight, and the cored bar was set in a dedicated mold kept warm on a hot plate kept at 120 ° C.
Next, 1000 parts by weight of a polyester polyol having an OH number of 55.0 and a molecular weight of 2000 having both terminal OH groups was weighed using a metal container with an appropriate capacity, and heated to 135 ° C. Was dehydrated for 3 hours with stirring under vacuum.

Next, the polyol is taken out from the vacuum reactor, heated until the liquid temperature reaches 145 ° C., 400 parts by weight of NDI (naphthylene diisocyanate) is added thereto, and after stirring well, the reaction dedicated to the heat-resistant polyurethane rubber is performed again. The mixture was transferred to a vessel and stirred for 20 minutes under vacuum to prepare a prepolymer comprising both terminal isocyanates.
An appropriate amount of 1,4 butanediol is mixed with this prepolymer, and poured into a support disk mold and a 2 mm flat plate injection mold that are set on a hot plate with uniform stirring so as not to quickly embed air, It was kept warm on the hot plate for 20 minutes.
Thereafter, each injection material was demolded from the injection mold and aged for 24 hours in an electric furnace kept at 110 ° C., and then allowed to stand at room temperature for 2 weeks for aging.

[Rubber hardness measurement]
Thereafter, when the hardness of the heat-resistant polyurethane rubber sheet was measured in the same manner as in Example 1, the type A durometer hardness was 96 degrees and the type D durometer hardness was 57 degrees.
[Melting point measurement]
As described in Example 1 above, the melting point of Comparative Example 2 using this heat-resistant polyurethane rubber is JIS K0064: Melting point and melting point measurement method for chemical products (US Pharmacopoeia (USP), European Pharmacopoeia (EP) The melting point was measured at 285 ° C., and the melting point by the simple measuring method was found to be around 300 ° C., and the polyurethane rubber was found to have very good heat resistance. Unfortunately, if the rubber surface becomes hot at around 300 ° C. for some reason, such as vibration due to poor rotation of the rotor shaft or frictional friction due to slip, unfortunately, as in Comparative Example 1 using general-purpose polyurethane rubber, It has been found that there is a situation where it melts easily and cannot be used until the manufacturer's maximum warranty life.

[Measurement of molded product performance]
Further, after finishing the surface of the heat-resistant polyurethane rubber injection-molded disk material produced as described above in the same manner as in Comparative Example 1, as in Comparative Example 1, either one of the side surfaces as shown in FIG. When the rotation test was carried out after mounting in a state in which the runout (23) was large and then attached to the assembled disk fixing unit (17), the runout of the unit suddenly increased after rotating for a slightly longer time than Comparative Example 1. The support assembly disk was removed from the assembly unit and observed.
As a result, as in Comparative Example 1, a part of the heat-resistant polyurethane rubber surface of the support disk was melted.

From the above results, even if the heat-resistant polyurethane rubber having the best heat resistance is used, if the use conditions are bad, the rubber surface is stored at a temperature higher than the melting point of the heat-resistant polyurethane rubber. It has been demonstrated that it may not be possible to use up to the guaranteed number of years.
Also, from these results, the manufacturer that manufactures each support disk has a side runout (23 of each support disk after insertion as shown in [C] instead of [D] in FIG. 11 in its product catalog. ) Is the most important in order to maintain a long-term guaranteed life, so that it can be inserted to zero as much as possible, and polyurethane rubber support discs require extremely accurate insertion unlike the present invention. Can also understand.

  Even if the rotor shaft support disk of the present invention has a slight runout due to the inconvenience when it is inserted, the support disk of the present invention has extremely excellent heat resistance, so that the rubber surface may be melted by frictional heat. However, it can be used as it is if it is removed and the core runout is corrected again. It is extremely useful as a rotor shaft support disk of a rotor type open-end spinning machine.

DESCRIPTION OF SYMBOLS 1 Standard type rotor shaft support single disc core metal 2 Rotor shaft support single disc rubber member 3 Covered rubber member surface groove part 4 Rotor shaft support single disc core metal bearing fixing hole 5 Laser measurement type rotor Single shaft disc cored bar 6 Laser rotating speed measurement through-hole 7 Reflector type rotor shaft supported single disc cored bar 8 Rotational speed measuring reflector 9 Rotor shaft supported single disc fixed bearing 10 Standard type rotor shaft Completed product of single support disc 11 Completed product of laser type rotor shaft support single product 12 Shaft portion of bearing for fixing single rotor shaft support disc 13 Standard type rotor shaft support assembly disc (2 standard type single product discs each Fixed to the left and right shafts)
14 Laser reflection type rotor shaft support assembly disk (one laser type single disk and one standard type single disk fixed to the left and right shafts of the bearing, respectively)
15 Reflector-type rotor shaft support assembly disk (one reflector-type single disk and one standard-type single disk fixed to the left and right shafts of the bearing)
16 Fiber bundle spinning rotor shaft 17 Disc set unit 18 Rotor fiber bundle outlet 19 Rotor fiber bundle inlet 20 Rotor shaft drive belt 21 Drive belt tension pulley
22 Spinning fiber bundle 23 Side runout of inserted rotor shaft support assembly disk 24 Alcohol lamp 25 Alcohol lamp flame 26 Aluminum block fixing base 27 Aluminum block 28 Thermocouple sensor section 29 for temperature measurement Digital thermometer 30 In a simple system Rubber member piece 31 of Example 1 for measuring melting point Rubber member piece 32 of Comparative Example 1 for measuring melting point by a simple method Rubber member piece 33 of Comparative Example 2 for measuring melting point by a simple method Rotor shaft Schematic of the part where the rubber surface of the single support disc melted during use 34 Boundary surface of the core metal and rubber of the single disc of the rotor shaft support A Reflector type rotor shaft support set disc set including the rotor shaft (old type)
B Complete set of laser reflecting rotor shaft support set including rotor shaft (new type)
C Front view of completed rotor shaft support assembly disk fitted normally into bearing D Front view of completed rotor shaft support assembly disk fitted slightly into bearing E Front view of a single rotor shaft support disk with partially melted rubber surface F Schematic diagram of the slope of a single disc with rotor shaft support with partially melted rubber surface

To compensate for the insufficient adhesion to the little and large adhesive surface area as (34) in FIG. 14, the enormous centrifugal forces to each manufacturer as competitive in terms of the devise, more expensive An attempt has been made to improve the adhesive strength by applying pressure between the polyurethane rubber and the metal core using a high pressure LIM molding machine dedicated to polyurethane rubber (Patent Document 1).
Furthermore, this open-end spinning machine is often used in combination with a normal ring spinning machine at a spinning factory, and short fibers that could not be used for ring spinning can be spun by this open-end spinning machine. As a result, so-called banned or contaminated raw cotton is used, so to speak, ineffectively, they adhere to the surface of the support disk or rotor shaft, and the polyurethane rubber surface may be damaged before the target life. At present, many short-life support disks that melt or occur have also occurred.
In addition to the problems described above, the polyurethane rubber members currently used have significant problems due to their chemical structure.
That is, as is well known, there are two types of polyurethane rubbers classified by their polyol components: ester polyurethane rubbers and ether polyurethane rubbers. Ether polyurethane rubbers have poor oil resistance and are contained in spun fibers. Only the ester-based polyurethane rubber having oil resistance is used exclusively.
However, the ester-based polyurethane rubber is inferior in hydrolysis resistance, and even if it is not used, it usually undergoes hydrolysis in about 4 to 5 years, changes from a rubber state to cheese, and becomes unusable.
Therefore, even if it is an unused support disk, it has a problem that it cannot be stored for a long time, and the user of the support disk knows that there are these uneconomical characteristics and uses it darely. The current situation is.

The rubber member used in the present invention is a type A durometer hardness (hereinafter simply referred to as a type A durometer hardness) measured by a measurement method of spring type hardness (durometer hardness) at 25 ° C. according to JIS K6253. Is a peroxide vulcanized rubber member having a Type D durometer hardness of 68 degrees or less, and JIS K0064: Method for measuring melting point and melting range of chemical products (US pharmacy) (USP), melting point measurement method based on European Pharmacopoeia (EP), melting at 400 ° C., type A durometer hardness of 90 degrees or more, type D durometer hardness of 68 The atmospheric temperature is 80 ° C. and the frequency in a bending vibration test method in accordance with JIS K-7244-5 (ISO 6721-5). tanδ as measured at 0Hz can be preferably used rotor shaft support disc coated formed using a rubber member, characterized in that more than 0.15.

[Melting point measurement]
In order to measure the melting point of the vulcanized rubber of Example 1, measurement based on JIS K0064: Melting point and melting range measurement method of chemical products (US Pharmacopoeia (USP), European Pharmacopoeia (EP) melting point measurement method) The melting point was measured simultaneously with Comparative Example 1 and Comparative Example 2 by the method.
Unless specifically capable into a powder in Example 1 and later-described Comparative Example 1 and a sharp cutter it creates debris about 1c m four-way from the rubber sheet 2mm thick produced in Comparative Example 2 Cut into small pieces, pack a suitable amount into a glass capillary tube with a thickness of about 1.0 mm, a length of about 80 mm, and a thickness of about 0.2 mm, and set the three samples in the melting point measuring device at a speed of 2 minutes per minute. The temperature was raised and each melting point was measured visually. As a result, the two types of finely pulverized urethane rubbers of Comparative Example 1 and Comparative Example 2 were melted at 190 ° C. and 285 ° C., respectively, but the rubber material of Example 1 had a limit temperature of 400 ° C. of this melting point measuring apparatus. However, it was confirmed that it did not melt.
However, although it was the original purpose to confirm the melting point of Example 1, since the melting point measuring apparatus of each existing manufacturer can only measure the melting point up to 400 ° C., the present inventor further shows that FIG. Using the simple measurement method devised by the present inventors, the approximate melting points of Example 1, Comparative Example 1 and Comparative Example 2 were simultaneously measured.

As a result, both of the comparative examples 1 made of general-purpose urethane rubber melted neatly at 200 ° C. to 210 ° C. in the form of polka dots, and both of the comparative examples 2 made of heat-resistant polyurethane rubber were neatly rounded at 300 ° C. to 310 ° C. It melted into a shape. However, unlike a synthetic rubber, a general synthetic rubber is said to carbonize and decompose without melting at a high temperature, but Example 1 does not soften or melt even when both of them reach 450 ° C. or higher. Further, since the carbonization decomposition did not occur even at about 500 ° C. of the carbonization decomposition temperature of the hydrogenated nitrile rubber compounded with a general plasticizer, further heating was stopped.
As a result, even this heat-resistant polyurethane rubber, which is said to be the most heat-resistant,
K0064: Compared to melting at 285 ° C. in the measurement based on the melting point and melting range measurement method of the chemical product, the rubber member of Example 1 is at least 100 ° C. or more and 150 ° C. or more in the simple measurement compared to the heat-resistant polyurethane rubber. Was found to have good heat resistance and not melt at all.

[Rubber hardness measurement]
When the hardness of this polyurethane rubber sheet was measured in the same manner as in Example 1, the hardness with a type A durometer was 95 degrees and the hardness with a type D durometer was 54 degrees.
[Melting point measurement]
As described in Example 1 above, the melting point of Comparative Example 1 conforms to JIS K0064: Melting point and melting range measurement method of chemical products (Measuring method of US Pharmacopoeia (USP), European Pharmacopoeia (EP)). As a result, it was found to be 190 ° C. and the heat resistance was considerably poor.
For this reason, even if a polyurethane rubber component manufacturer creates a rotor shaft support disk using this general polyurethane rubber, it melts relatively easily when the rubber surface becomes hot for some reason, and the quality is low. It turns out that only support disk products can be obtained.

[Rubber hardness measurement]
Thereafter, when the hardness of the heat-resistant polyurethane rubber sheet was measured in the same manner as in Example 1, the type A durometer hardness was 96 degrees and the type D durometer hardness was 57 degrees.
[Melting point measurement]
As described in Example 1 above, the melting point of Comparative Example 2 using this heat-resistant polyurethane rubber is JIS K0064: Melting point and melting range measurement method of chemical products (US Pharmacopoeia (USP), European Pharmacopoeia (EP ) Melting point measurement method)) was 285 ° C., and the melting point in the simple measurement method was found to be around 300 ° C., and it was found that the polyurethane rubber had very good heat resistance. If the rubber surface becomes hot at around 300 ° C for some reason, such as vibration due to poor rotation of the rotating rotor shaft or frictional heat due to slipping, it is a pity as with Comparative Example 1 using general-purpose polyurethane rubber. However, it was found that it melted easily and could not be used until the longest warranty life guaranteed by the manufacturer.

Claims (5)

  A disk that supports a rotor shaft of a rotor type open-end spinning machine, and a rubber member is adhesively coated on the periphery of the disk via an adhesive, and the rubber member is 18 to 44% by weight of bonded acrylonitrile hydrogenated nitrile A rotor shaft support disk of a rotor type open-end spinning machine, characterized in that it is formed from a rubber member obtained by peroxide vulcanizing rubber (HNBR) and / or a modified product thereof.   2. The rotor shaft according to claim 1, wherein the modified product is a rubber in which zinc methacrylate and / or zinc acrylate is blended in an amount of 20 to 120 parts by weight with respect to 100 parts by weight of hydrogenated nitrile rubber. Support disk.   The modified product is a carboxyl group-introduced hydrogenated nitrile rubber (HXNBR) obtained by hydrogenating a nitrile rubber obtained by terpolymerization of 1 to 10% by weight of methacrylic acid and / or acrylic acid. The rotor shaft support disk as described. JIS K6253 (ISO 48, ISO 48) at 25 ° C. of the peroxide vulcanized rubber member.
7619), the type A durometer hardness is 90 degrees or more and the type D durometer hardness is 68 degrees or less in a spring type (durometer hardness) hardness measuring method in accordance with No. 7619). 4. A rotor shaft support disk of a rotor type open-end spinning machine according to any one of 3 above.   The peroxide vulcanized rubber member is a melting point measurement method based on JIS K0064: melting point and melting point measurement method of chemical products (melting point measurement method of US Pharmacopoeia (USP), European Pharmacopoeia (EP)) even at 400 ° C. It is not melted, and tan δ when measured at an ambient temperature of 80 ° C. and a frequency of 60 Hz in a bending vibration test method in accordance with JIS K7244-5 (ISO 6721-5) is 0.15 or less. It is a rubber member, The rotor shaft support disk in any one of Claims 1-4.