JP2003268194A - Resin composition and sash roller therefrom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sash roller made of a polyacetal resin composition which is excellent in a running property in opening and closing a sash or a hinged door and in compressive deformation, and the polyacetal resin composition. <P>SOLUTION: This polyacetal resin composition contains a polyacetal resin, a specific nucleating agent, and a fatty acid ester sliding agent. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyacetal resin material for door rollers containing a polyacetal resin, a nucleating material, and a fatty acid ester-based sliding agent, and a polyacetal resin door roller made of the resin material. More specifically, the present invention provides a door roller made of polyacetal resin, which is excellent in running property and compression deformation when a sash, hinged door, etc. are opened and closed.

[0002]

2. Description of the Related Art Polyacetal resins are widely used for mechanical parts in the fields of automobiles, electronic / electrical fields, building materials, etc. because of their excellent mechanical strength, creep resistance and slidability. When used in these mechanical parts, especially in open / close mechanism parts such as sashes and doors, creep resistance and door open / close running property are important from the viewpoint of durability of the mechanical parts. Therefore, if the material is selected incorrectly, the amount of compressive deformation due to the load on the door becomes large, making it difficult to open or close the sash or the door, and further causing problems such as the door roller itself breaking.

Further, sliding properties with a metal rail and sliding properties with a metal shaft mounted at the center of the door are also important characteristics of the door, and if the sliding property is poor, the amount of wear of the door itself will be great. The problem is that the operating noise increases due to rattling when opening and closing the door. In order to solve these problems, in the past, the door roller itself was made thicker to suppress the amount of compressive deformation of the door roller itself, and grease was added to the bearing part with the metal shaft to give sliding characteristics, or polyacetal resin sliding Methods such as using grades to improve running performance have been adopted.

However, these methods cannot satisfy both the open / close running property and the amount of compressive deformation. The reason is that in the method of increasing the thickness of the door roller to suppress the amount of compressive deformation of the door roller itself, increasing the thickness of the door roller itself tends to cause voids inside the door roller, and it is not possible to provide sufficient strength. In addition, in the method of injecting grease into the bearing portion to provide slidability, the grease may run out depending on the environment in which it is used (room temperature, load such as sash), and stable slidability cannot be maintained for a long period of time. On the other hand, in the method using the sliding grade made of polyacetal resin, the crystallinity of the door roller itself decreases due to the inclusion of the sliding material, the amount of compressive deformation increases, and the open / close running property of the sash, door, etc. is sufficient. However, there is a problem that the production process is complicated, such as the need for insert molding of the bearing.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a polyacetal resin material for a door sash and a door sash thereof, which is excellent in the open / close running property of a sash, a hinged door, and the like, and is excellent in compressive deformation due to the load of the sash or the hinged door.

[0006]

Means for Solving the Problems As a result of intensive studies to achieve the above object, it was found that a polyacetal resin roller made of a polyacetal resin, a nucleating material and a fatty acid ester lubricant is effective, and the present invention Reached That is, the present invention is: 1. A polyacetal resin material for door rollers, which comprises a polyacetal resin and a nucleating material. The nucleation material, door rollers for polyacetal resin materials according to claim 1 selected from the group consisting of boron nitride, talc, calcium carbonate, 3. 3. The polyacetal resin material for door rollers as described in 1 or 2 above, which contains a fatty acid ester-based sliding agent. The polyacetal resin door roller made of the resin material described in 1 to 3 above, which is the main component of the present invention, is the formaldehyde monomer, or its trimer (trioxane) or tetramer. It is a polyoxymethylene homopolymer obtained by terminally stabilizing an oxymethylene homopolymer substantially composed of oxymethylene units produced from a cyclic oligomer such as (tetraoxane).

In addition, ethylene oxide, propylene oxide, epichlorohydrin, 1,3-dioxolane, 1,4-butanediol, glycol formal and diglycol containing 10 to 500 ppm of the above-mentioned raw materials and a hindered phenolic antioxidant are added. A polyoxymethylene copolymer obtained by subjecting an oxymethylene-oxyalkylene copolymer containing 0.1 to 20% by weight of an oxyalkylene unit having 2 to 8 carbon atoms, which is produced from a cyclic formal such as formal, to a terminal stabilization treatment Is. Among these polyacetal resins, the melt flow rate (hereinafter sometimes abbreviated as MFR) is 5 to 40 g.
A / 10 min polyacetal homopolymer is preferred.

The nucleating material referred to in the present invention is at least one selected from the group consisting of boron nitride, talc and calcium carbonate. These nucleating materials may be used alone or in combination. . The particle size of the nucleating material is in the range of 0.001 to 20 μm in average particle size, preferably 0.0
It is 1 to 10 μm. The particle size of the nucleating material can be measured with a scanning electron microscope (SEM). The content of the above nucleating agent is 0. 0 from the viewpoint of 100% by weight of polyacetal resin, the amount of compressive deformation, running property at door opening and closing, and moldability.
It is in the range of 01 × 10 ^{−6 to} 100 × 10 ⁻⁶ parts by weight, preferably 0.1 × 10 ⁻⁶ to 50 × 10 ⁻⁶ parts by weight.

Further, for the purpose of providing the resin material of the present invention with slidability with respect to a metal shaft bearing portion and a metal rail,
A fatty acid ester lubricant can be used if necessary. Fatty acid ester type lubricants are oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid,
At least one selected from the group consisting of suberic acid, azelaic acid, sebacic acid, undecanoic acid, brassic acid, maleic acid, fumaric acid, glutaconic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, and behenic acid. The above is also included, and esters including the above compounds and alcohols and diols are also included.

Alcohols include methyl alcohol, ethyl alcohol, propyl alcohol, n-butyl alcohol, isobutyl alcohol, tert-butyl alcohol, n-amyl alcohol, 2-pentanol, n-peptyl alcohol, n-octyl alcohol. ,
n-nonyl alcohol, decyl alcohol, undecyl alcohol, lauryl alcohol, tridecyl alcohol, myristyl alcohol, pentadecyl alcohol,
It is cetyl alcohol.

Further, heptadecyl alcohol, stearyl alcohol, oleyl alcohol, nonadecyl alcohol, eicosyl alcohol, ceryl alcohol, behenyl alcohol, melysyl alcohol, hexyldecyl alcohol, octyldodecyl alcohol, decylmyristyl alcohol, decylstearyl alcohol, uniline. It is a saturated / unsaturated alcohol such as alcohol.
Examples of the diols include ethylene glycol, polyethylene glycol and propylene glycol. These ester lubricants may be used alone or in combination of two or more. The above fatty acid ester-based lubricant may be a monoester or a diester,
Further, a small amount of unreacted alcohol or diol may be contained in the ester reaction process.

Among the above fatty acid esters, especially dilauryl adipate, dimyristyl adipate, dicetyl adipate, monolauryl adipate, monomyristyl adipate, monocetyl adipate, stearate stearate, ethylene glycol stearate, polyethylene glycol stearin. Acid esters are preferred. The addition amount of the fatty acid ester lubricant is not particularly limited, but from the balance of slidability and compression deformation amount,
0.05 to 100 parts by weight of polyacetal resin
It is 10 parts by weight, preferably 0.1 to 5 parts by weight.

The resin material of the present invention contains additives that have been conventionally used, such as antioxidants, flame retardants, mold release agents, etc., as long as the open / close running property and compression deformability of sashes and doors are not impaired. Antistatic agents, colorants, lubricants, lubricants, plasticizers, heat stabilizers, weathering agents, anticorrosion agents and glass fibers, glass beads, potassium whisker titanate, reinforcing agents such as wellastonite, and pigments have been added. It is also possible to use a resin material. The shape and size of the polyacetal resin door roller referred to in the present invention are not particularly limited, and door rollers that have been conventionally designed, such as door rollers and ribs provided with ribs for the purpose of improving compression deformability and moldability, etc. Of the present invention, a door roller in which a metal bearing is insert-molded, or a door roller in which a resin bearing portion of a metal shaft is insert-molded is also included in the door wheel referred to in the present application.

The method for molding the polyacetal resin door roller of the present invention is not particularly limited, and it is possible to mold by a conventionally used molding method, and the shape of the mold is conventionally molded. There are no particular requirements such as solid molding in which a large number of pin gate dies are used, or injection molding using a hot runner die.
Usually, the polyacetal resin can be molded without any problem if it is within the molding condition range. For example, the resin temperature is in the range of 190 ° C to 220 ° C and the mold temperature is 40 ° C.
Molding can be performed by appropriately selecting in the range of 90 ° C to 90 ° C.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail, but the present invention is not limited to these embodiments. The MFR of the polyacetal resin described in the examples, the compression deformation amount, the open / close running property evaluation method, and the crystal state observation method of the door roller were evaluated and measured by the following methods. (1) Melt flow rate: ISO 1193 ('97) conditions
It measured according to D. (2) Dimensions of door roller and molding conditions Using an injection molding machine of 120 tons, diameter 60φ, wall thickness 6
mm door rollers were formed by a method in which four bearings were inserted in a metal mold. The bearing part and the door roller body are made of the same material. The molding conditions at this time were a resin temperature of 200 ° C., a mold temperature of 90 ° C., and a cooling time of 20 seconds. (3) Test piece for stress measurement at 5% strain and measurement conditions Using an injection molding machine of 30 tons, four prisms each having a size of 4 mm × 4 mm and a height of 10 mm were molded with a mold. The resin temperature was 200 ° C., the mold temperature was 70 ° C., and the cooling time was 15 seconds. The test piece obtained here was used to measure the stress at 5% strain. The measurement conditions were evaluated by a method of compressing at a constant speed of 1 mm / min and measuring the stress when the strain amount reached 5%. The test environment temperature at this time was 70 ° C.

(4) Opening and Closing Runability Two door rollers obtained by injection molding were attached to two lower parts of the sash with a load of 100 kgf, and an opening / closing test was conducted at a speed of 10,000 times / day and 500,000 times. After the test, the door roller body was visually inspected for cracks or cracks, and whether or not a rattling operation noise was generated when the door was opened or closed was observed. Further, the amount of deformation of the door roller body and the amount of wear of the bearing portion were measured when the door was opened and closed 500,000 times. The deformation amount of the door roller body and the wear amount of the bearing portion were evaluated by the following methods. (5) Deformation amount of the door roller body It was evaluated by the difference in roundness before and after the open / close running test of 500,000 times.
The roundness was measured by Mitutoyo Round Test RA-400 (roundness cylindrical shape measuring instrument).

(6) Abrasion amount of bearing part 500,000 times The weight change before and after the open / close running test was evaluated. (7) Crystal state observation The door roller obtained by injection molding is 10 μm with a microtome.
A superfoil piece having a thickness of 1 was cut out and the spherulite state was observed with a polarizing microscope. The abbreviations used in the table are as follows. Polyacetal resin a-1: Tenac 3010 (manufactured by Asahi Kasei Corporation), MFR
2.8 g / 10 min a-2: Tenac 4010 (manufactured by Asahi Kasei Corporation), MFR1
0g / 10min a-3: Tenac 7010 (manufactured by Asahi Kasei Corporation), MFR3
4g / 10min a-4: Tenac-C4520 (manufactured by Asahi Kasei Corporation), MF
R 9 g / 10 min Nucleating material b-1: Boron nitride average particle size 3 μm b-2: Talc average particle size 6 μm b-3: Calcium carbonate average particle size 8 μm Fatty acid ester c-1: Dilauryl adipate c-2: Ethylene Glycol distearate c-3: Polyethylene glycol distearate

[0018]

Example 1 Melt flow rate (ISO11) obtained by the method described in US Pat. No. 2,998,409.
33 ('97) measured according to Condition D) was 9.0 g / 10 min, and polyacetal homopolymer powder having both ends acetylated was dried at 80 ° C. for 3 hours to obtain 100 parts by weight of the obtained polyacetal homopolymer. Triethylene glycol-
Bis [3- (3-t-butyl-5-methyl-4-hydroxyphenyl) propionate] 0.3 parts by weight, nylon 6 /
6 crushed product (average particle size 4 μm) and the core material shown in Table 1 were mixed, and the single-screw extruder (3
Melt kneading at 0φ) and pelletizing.

After drying the obtained pellets at 80 ° C. for 3 hours, a prism having a size of 4 mm × 4 mm and a height of 10 mm was molded by an injection molding machine. For the door roller, a preformed metal shaft bearing portion (the same material as the door roller body) was inserted and molded. The obtained prism and door roller are 23 ° C (humidity 5
It was allowed to stand in a thermostatic chamber (0%) for 48 hours, and then the open / close runnability was evaluated at a stress of 5% at 500,000 times. The results are shown in Table 1.

[0020]

Examples 2 to 3 The same operations as in Example 1 were performed and evaluated except that polyacetal homopolymers having different melt flow rates were used. The results are shown in Table 1.

[0021]

[Examples 4 to 10] The same operations as in Example 1 were carried out and evaluated, except that the type of nucleating agent, the addition amount, and the fatty acid ester were added. The results are shown in Table 1.

[0022]

Comparative Examples 1 to 4 Using the polyacetal resin shown in Table 2, the stress at 5% strain and the stress at 50% were measured in the same manner as in Example 1.
The running performance was evaluated 10,000 times. The results are shown in Table 2.

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

INDUSTRIAL APPLICABILITY The present invention suppresses the compressive deformation due to the load of a sash or a door by adding and containing a nucleating material and a fatty acid ester-based lubricant in a polyacetal resin, and at the same time, a metal rail or a metal shaft. The slidability was also improved by suppressing the amount of wear with. The door roller made of the polyacetal resin of the present invention has remarkably improved open / close running performance, and simplifies the production process such as grease application.

[Brief description of drawings]

[Figure 1] Schematic diagram of a door roller made of polyacetal resin

[Explanation of symbols]

1. Door car body 2. Bearing part 3. rib

Claims (4)

[Claims] 1. A door accommodating (position changing) polyacetal resin material comprising a polyacetal resin and a nucleating material. 2. The polyacetal resin material for door wheels according to claim 1, wherein the nucleating material is selected from the group consisting of boron nitride, talc, and calcium carbonate. 3. A polyacetal resin material for door rollers according to claim 1, which contains a fatty acid ester-based sliding agent. 4. A polyacetal resin door roller made of the resin material according to any one of claims 1 to 3.