JP3144919B2 - Nylon 610 monofilament for polishing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing monofilament. More specifically, the present invention relates to a polishing monofilament having excellent durability when polishing and grinding the surface of metals with a brush roll or the like and suitable for use as an industrial brush.

[0002]

2. Description of the Related Art It has been well known that a monofilament made of a thermoplastic resin containing abrasive particles is used in the fields of polishing and abrasive materials such as industrial brushes. As the thermoplastic resin, nylon 6, nylon 610, nylon 612, nylon 6 /
Polyamide 66 (copolymer of nylon 6 component and nylon 66 component) and nylon 12 are mainly used. By the way, when these industrial brushes are put to practical use, the brush is applied to the polishing and grinding surfaces for the purpose of diffusing frictional heat generated in the grinding and grinding processes to prevent heat storage, and for the purpose of cleaning the polishing and grinding surfaces. In most cases, work is performed while spraying liquids such as water, warm water and various types of emulsion liquids on contacting points. Conventionally used monofilaments suffer from deterioration in physical properties due to wet heat deterioration, oxidation deterioration and the like during brushing, and have a problem in that the polishing and grinding effects cannot be sufficiently exerted due to reduced durability. As a remedy, a method of adding copper iodide as a heat stabilizer (Japanese Patent Application Laid-Open No. 4-41183) is disclosed, but as a method for improving durability, it has not yet reached a satisfactory level.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polishing monofilament capable of sufficiently exhibiting a polishing force and a grinding force by improving durability.

[0004]

Means for Solving the Problems The present inventors have made intensive studies in order to achieve the above object, and have reached the present invention. That is, the present invention has a relative viscosity of 3.5 to 5.0,
Nylon 610 monofilament for polishing characterized by containing 10 to 50% by weight of abrasive particles.

[0005] The relative viscosity of nylon 610 used to obtain the filaments of the present invention is optimally in the range of 4.0 to 6.0. Relative viscosity is 98% by weight concentrated sulfuric acid 1
This is a value obtained by measuring the solution viscosity obtained by dissolving 1 g of the thermoplastic resin in 00 ml at 25 ° C. using an Ostwald viscometer. When the relative viscosity is less than the lower limit, especially when the relative viscosity is less than 3.0, the melt viscosity during melt spinning is reduced and it is difficult to obtain a uniform monofilament, and when the relative viscosity is 3.0 to 4.0, a uniform monofilament is obtained. Although a slight improvement in durability is observed, the durability level has not yet been satisfied. On the other hand, when the relative viscosity exceeds 6.0, the melt viscosity is remarkably increased, and it becomes difficult to perform melt spinning, so that not only a uniform monofilament for polishing can not be obtained, but also a factor for lowering spinnability or affecting durability. Many voids are generated and sufficient durability cannot be obtained. The relative viscosity of the polishing monofilament of the present invention obtained by using the above-mentioned nylon 610 is 3.5 to 5.0.

[0006] The polishing monofilament of the present invention comprises a heat stabilizer, an antioxidant, a lubricant, which are usually added to a thermoplastic resin.
It may contain a coloring agent and the like. For example, a copper halide or the like is used as a heat stabilizer, and 2,4,6-triol is used as an antioxidant.
-Tert-butyl-phenol and the like, and further, a lubricant such as talc and calcium carbide and a coloring agent such as titanium oxide can be included.

The abrasive particles usable in the present invention include oxides such as aluminum oxide and zirconium oxide, carbides such as silicon carbide, nitrides such as silicon nitride, artificial abrasives such as artificial diamond, and diamond, corundum,
Examples include natural abrasives such as emery and garnet, and these may be used alone or in combination of two or more. The particle size of the abrasive particles is usually in the range of $ 30 to $ 2000, but especially $ 46.
Those having a range of-$ 1000 can be preferably used from the viewpoint of polishing power, grinding power and spinnability.

In the present invention, the content of abrasive particles in the polishing monofilament is 10 to 5 with respect to nylon 610.
It is in the range of 0% by weight, particularly preferably 20 to 40% by weight. If the content is less than 10% by weight, the polishing power and the polishing power are insufficient, and
If the content exceeds% by weight, monofilament molding becomes extremely difficult, and also the toughness is greatly reduced and the durability is poor, which is not preferable.

[0009] Coupling agents commonly used in polyamides to strengthen the adhesion between the abrasive particles and the thermoplastic resin can also be used in the present invention. As an example of the coupling agent, a silane coupling agent having two kinds of functional groups such as a methoxy group chemically bonding to an inorganic material and an amino group bonding to an organic material is often used for polyamide.

The melt spinning of the monofilament can be carried out, for example, by an extrusion method in the same manner as the usual polyamide melt spinning. In the present invention, the diameter of the polishing monofilament is not particularly limited. The diameter can be arbitrarily selected from the range of 0.1 to 3.0 mm in diameter depending on the requirements of the field of use. In the present invention
Polishing monofilament has a void fraction of 5% or less
Is preferred. More preferably, the void ratio is 4.2% or less.
It is. As shown in Comparative Example 3, the void ratio was about 10%.
The durability as a polishing monofilament decreases
I do. Thus, according to the present invention, a polishing monofilament having extremely excellent durability can be obtained. Therefore, by using the polishing monofilament according to the present invention for an industrial brush, a general household brush, or the like, excellent polishing and grinding capabilities can be exhibited.

[0011]

Next, the present invention will be described in more detail by way of examples. In addition, physical properties were evaluated by the following methods. 1) Durability: A total of 30 polishing monofilament cylindrical rolls are fixed to the circumferential surface so as to be radial from the center, and this roll is attached to the surface of a stationary steel plate for 1200 r.
Rotational collision at pm, water temperature 45 ° C x 150
The durability is represented by the time (minutes) until the thread breakage of the polishing monofilament starts due to bending fatigue while spraying at liter / hr. Here, the length from the fixing position of the polishing monofilament to the tip is 30 mm, and the distance from the fixing position of the polishing monofilament to the steel sheet surface is 20 mm.

2) Void fraction: The actual density is measured and calculated by the following equation. The real density is calculated by filling a 10 ml weighing bottle with water at a constant temperature, adding 5 g of a sample to the water, and calculating the difference between the weight of water and water + sample in a fixed volume. Void rate (%) = (1−substantial density / theoretical density) × 100 3) Spinnability: Judgment was made as follows from the state during spinning.

…: Stable continuous spinning can be performed, and thread breakage does not occur. X: Poor spinnability, non-uniform monofilament diameter.

[0014]

Example 1 An amine silane coupling agent equivalent to 0.4% by weight of silicon carbide (K-Shin-Etsu Chemical Co., Ltd.)
30% by weight based on BM-603) and nylon 610
No. 100 silicon carbide (manufactured by Showa Denko KK) was blended into 50 kg of nylon 610 pellets having a relative viscosity of 4.4, and 0.02% by weight of iodide steel was added to the total amount thereof, and a 150 liter tumbler was added. The mixture was uniformly mixed with a mold mixer. Next, the mixture was put into a hopper provided at the top of the melt extruder, guided to a melting zone of the extruder kept at 280 ° C., melted, discharged from a spinneret and spun into cooling water at room temperature. Subsequently, the solidified monofilament was wound at 40 m / min while being stretched 2.5 times in a hot water bath to obtain a polishing monofilament having a diameter of 1.6 mm.

[0015]

Example 2 Using nylon 610 having a relative viscosity of 5.9,
All other conditions were the same as in Example 1, with a diameter of 1.6.
mm was obtained.

[0016]

Comparative Example 1 Using nylon 610 having a relative viscosity of 2.9,
All other conditions were the same as in Example 1, with a diameter of 1.6.
mm was obtained.

[0017]

Example 2 Using nylon 610 having a relative viscosity of 3.3,
All other conditions were the same as in Example 1, with a diameter of 1.6.
mm was obtained.

[0018]

Comparative Example 3 Using nylon 610 having a relative viscosity of 6.7,
All other conditions were the same as in Example 1, with a diameter of 1.6.
mm was obtained. Table 1 summarizes the evaluation results of the monofilaments obtained in the above Examples and Comparative Examples. As is clear from Table 1, the monofilament for polishing (Examples 1 and 2) of the present invention has good spinnability and greatly improved durability, and the effect of the improvement is remarkable. On the other hand, the polishing monofilaments having a relative viscosity of less than 3.5 (Comparative Examples 1 and 2) have insufficient durability. on the other hand,
When the relative viscosity exceeds 6.0, the viscosity of the melt during the spinning of the polishing monofilament is remarkably increased, the spinnability is poor, the diameter of the monofilament is non-uniform, and the void fraction is high, and high durability is exhibited. Did not.

[0019]

[Table 1]

[0020]

As described above, the polishing monofilament of the present invention has much higher durability than the conventional one. Therefore,
When applied to an industrial brush, the polishing and grinding effects can be sufficiently exhibited from the excellent durability.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-41183 (JP, A) JP-A-61-125777 (JP, A) JP-A-60-9910 (JP, A) JP-A 53- 5490 (JP, A) JP-A-60-88110 (JP, A) JP-A-49-25587 (JP, A) JP-A-4-41182 (JP, A) JP-B-47-5318 (JP, B1) (58) Field surveyed (Int.Cl. ⁷ , DB name) D01F 6/90 301 D01F 6/60 311 D01F 6/60 351

Claims (3)

(57) [Claims] 1. A polishing nylon 610 monofilament having a relative viscosity of 3.5 to 5.0 and containing 10 to 50% by weight of abrasive particles. 2. The method according to claim 1, wherein the void ratio is 5% or less.
The polishing nylon 610 monofilament according to claim 1,
And 3. The method according to claim 1, wherein the void ratio is 4.2% or less.
The polishing nylon 610 monofil according to claim 1, wherein
Lament.