JP2826684B2 - Lubricant composition for water-soluble plunger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricant composition for a plunger used for reducing friction between an inner surface of an injection sleeve and a plunger in casting a metal such as aluminum and magnesium.

[0002]

2. Description of the Related Art A plunger lubricant has a function of reducing friction between a plunger and an injection sleeve and smoothly feeding molten metal into a cavity. As such a plunger lubricant, a water-insoluble lubricant and a water-soluble lubricant are conventionally known. Here, as the water-insoluble lubricant, for example, a lubricant using a powder such as graphite has been disclosed (JP-A-1-144494, etc.). Further, as the water-soluble lubricant, for example, mineral oil, fats and oils,
A lubricant composition comprising a fatty acid ester, a solid lubricant, and a surfactant has been proposed (JP-A-2-248497).

[0003]

However, the above-mentioned water-insoluble lubricant has a risk of fire since it contains oil as a main component, and also has a problem of soiling around the machine. On the other hand, a water-insoluble lubricant containing no graphite and using a white solid lubricant (JP-A-2-215894) or a water-insoluble lubricant containing no powder (JP-A-2-228393) Japanese Unexamined Patent Publication (Kokai) No. 2000-214, has been proposed, but the former has a problem that the danger of fire is still present, and the latter has a problem that the lubricant is inferior in lubricity. On the other hand, the water-soluble lubricant is
There is a problem that the lubricating property is inferior to that of the water-insoluble lubricant, and the plunger tip is seized. Therefore,
In fact, no plunger lubricant having excellent lubricity and good workability has been found as a plunger lubricant.

[0004] The present invention has been made in view of the above viewpoints, and an object of the present invention is to provide a lubricant composition for a plunger, which maintains a high lubricity, has no danger of fire, and has good workability. I do.

[0005]

The present inventors have conducted intensive studies on the relationship between the lubricating properties of the plunger and the lubricant composition. As a result, the present inventors have found that the lubricating properties are excellent, there is no danger of fire, and Thus, a lubricant composition for a water-soluble plunger, which has a small amount of adhesion and has good workability that can be easily removed even if it adheres, was created, and the present invention was completed. That is, the lubricant composition for a plunger of the first invention comprises (a) one or more kinds selected from the group consisting of mineral oils, fats and oils, fatty acids and fatty acid esters, (b) wax, and (c) higher fatty acids. Water- soluble consisting of metal salt, (d) surfactant and (e) water
A lubricating composition for a plunger, comprising :
The component (a) 10 to 6 is used with respect to the total amount of the component (e).
0% by weight, 1 to 15% by weight of the component (b), and (c)
Component 1 to 15% by weight, component (d) 0.5 to 10% by weight
%, 30 to 75% by weight of the component (e).
Characterized in that that.

[0006] The mineral oils, fats, fatty acids and fatty acid esters, I component der for exhibiting lubricity in plunger lubrication (in particular lubrication in a low temperature range), the
The combination of the components (a) to (e) or the components (a) to (f)
10 to 60% by weight (preferably 20 to 50% by weight)
% By weight). Here, as the “oil and fat”,
For example, rapeseed oil, soybean oil, coconut oil, palm oil, tallow,
Animal and plant fats such as lard, etc. are exemplified. Examples of the "fatty acid" include coconut oil fatty acid, oleic acid, stearic acid, lauric acid, palmitic acid, tallow fatty acid, and the like. Further, examples of the "fatty acid ester" include monohydric alcohol esters or polyhydric alcohol esters of higher fatty acids such as coconut oil fatty acid, oleic acid, stearic acid, palmitic acid, lauric acid, tallow fatty acid, and the like. Among these, from the viewpoint of heat resistance and solubility, it is preferable to select an ester of a hindered alcohol such as trimethylolpropane, neopentyl glycol or pentaerythritol with coconut oil fatty acid, oleic acid, stearic acid or the like.

[0007] Examples of the above-mentioned "wax" include natural or synthetic hydrocarbon waxes and waxes, and oxides and acid-modified products thereof. here,
Examples of natural waxes include animal and plant waxes such as beeswax, whale wax, hydrogenated whale wax, carnauba wax, canderia wax, wood wax, bran wax, paraffin wax, microcrystalline wax, montan wax, sericin wax and the like. Mineral wax and the like can be mentioned. Examples of the synthetic wax include a polyethylene wax, a polypropylene wax, and a wax by a Fischer-Tropsch method. The content of the “wax” is determined according to the above (a) to
With respect to the total amount of the component (e) or the components (a) to (f),
To 1 to 15% by weight (preferably 3 to 10% by weight)
You.

Further, the above “metal salt of higher fatty acid” is a component which prevents oil film breakage in a high-temperature region in plunger lubrication and exhibits lubricity.
Use is made of salts of higher fatty acids such as oleic acid, stearic acid, lauric acid, palmitic acid and tallow fatty acids with metals such as sodium, potassium, magnesium, lithium, calcium, aluminum and zinc. This high-grade fat
The content of the “acid metal salt” is determined according to the above components (a) to (e) or
1 to 15 weight based on the total amount of the above components (a) to (f)
% (Preferably 2 to 10% by weight). Further, the above-mentioned "surfactant" is a component having a function of solubilizing the lubricant when the attached lubricant is removed by washing with water, and if it does not prevent uniform mixing of the composition, it may be a cationic surfactant. Any of a surfactant, an anionic surfactant and a nonionic surfactant can be used. The content of the “surfactant” is determined according to the above components (a) to (e) or the above components.
0.5 to 10% by weight based on the total amount of the components (a) to (f)
% (Preferably 1 to 7% by weight).

The plunger lubricant composition of the second invention is obtained by further adding a white solid lubricant to the components of the plunger lubricant composition of the first invention. This “white solid lubricant” is added to improve heat resistance and lubricity. As the white solid lubricant, for example, as shown in the third invention, talc,
It is appropriate to use fluorinated graphite, mica, boron nitride, polyfluoroethylene, or the like. This “white solid lubricant”
The amount is 1 to 1 with respect to the total amount of the above components (a) to (f).
10% by weight. The lubricant for a water-soluble plunger of the present invention contains the above components and water as essential components. In addition to these essential components, an anticorrosive, a thickener, a wetting agent, an antiseptic / antifungal agent, an antifoaming agent And other optional additives can be added as appropriate.

[0010]

EXAMPLES The contents of the present invention will be specifically described below with reference to examples and comparative examples. (1) Preparation of Lubricant Table 1 shows the composition according to the example of the present invention, and Table 2 shows the composition of the comparative example.

[0011]

[Table 1]

[0012]

[Table 2]

However, the numerical values relating to the compositions in each table are parts by weight unless otherwise specified. As the mineral oil in each table, “SAE-30 (trade name)” (manufactured by Nippon Oil Co., Ltd., having a kinematic viscosity at 40 ° C. of 100 mm ² / s)
Was used. Further, the wax in each table indicates an oxidized polyethylene wax, and specifically, “AC polyethylene 62”
9 (trade name) "(manufactured by Allied Chemical Company, concentration; acid value 1)
6) was used. Further, calcium stearate was used as the higher fatty acid metal salt in the table. Surfactant A refers to "Nonipol SN40 (trade name)" (manufactured by Sanyo Chemical Industries, Ltd.), and surfactant B refers to "Nonipol S."
N85 (trade name) "(manufactured by Sanyo Chemical Industry Co., Ltd.), and surfactant C indicates sorbitan monooleate. Further, in addition to the lubricant compositions listed in the same table, "Neocaster PW60 (trade name)" (a lubricant for plunger manufactured by Matsumura Oil Co., Ltd., a wax emulsion containing graphite) was prepared. 6 is assumed.

(2) Performance Test A lubrication performance test was conducted to clarify the performance of the lubricant composition of the present invention. Hereinafter, test methods and test results (coefficient of friction) are shown. Test method The test method is as follows. Testing machine: Hot friction tester Specimen (rotating body): S10C, 60mmφ × 17mm Heating body: S35C, 80 × 8 × 12mm Load: 89N Rotation speed: 38mm / min Heating body temperature: 200, 300 Friction time: 5min Application of lubricant composition: 0.2 g applied to rotating body

Test Results Table 3 shows the results of the performance test.

[0016]

[Table 3]

However, each numerical value in the table indicates a coefficient of friction at each heating element temperature. In addition, "x" in the table indicates that the plunger was seized in about 2 minutes after the start of the friction test.

(3) Performance Evaluation In the lubricant composition according to this example (Examples 1 to 5),
Compared to the conventional products (Comparative Examples 1 to 6), the coefficient of friction was significantly reduced at each heating element temperature, and the plunger did not burn. Further, even when the water-soluble lubricant composition of this example was used, since it contained 35 to 70% of water, there was little danger of causing a fire and the surroundings of the machine were not polluted.

It should be noted that the present invention is not limited to the specific embodiments described above, but can be variously modified within the scope of the present invention in accordance with the purpose and application. That is,
The composition of the lubricant composition according to this embodiment can be variously selected according to the purpose and application within the scope of the present invention.

[0020]

As described above, the lubricant composition for a water-soluble plunger of the present invention has excellent lubricity.
It can be used safely as a plunger lubricant in high speed or high mold clamping force casting. Also,
Even if it adheres around the machine, it can be easily washed and removed, and since the present composition is water-soluble, there is no fear of fire and the workability can be improved.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C10M 125: 30 105: 24 159: 06 129: 76 125: 02) C10N 10:02 10:04 10:06 30:06 40: 24 (58) Field surveyed (Int.Cl. ⁶ , DB name) C10M 173/00 C10M 101/02-101/04 C10M 129: 40 C10M 105/24 C10M 159/06 C10M 129/76 C10N 10:02- 10:06 WPI / L (QUESTEL)

Claims (3)

(57) [Claims] 1. (a) one or more selected from the group consisting of mineral oils, fats and oils, fatty acids and fatty acid esters,
Lubrication for a water-soluble plunger consisting of (b) wax, (c) higher fatty acid metal salt, (d) surfactant and (e) water.
Agent composition, wherein the total amount of the components (a) to (e) is
Component 10 to 60% by weight, component (b) 1 to 15% by weight
%, Component (c) 1 to 15% by weight, component (d)
0.5 to 10% by weight, component (e) 30 to 75% by weight
Soluble plunger lubricant composition characterized by containing, respectively. 2. (a) one or more selected from the group consisting of mineral oils, fats and oils, fatty acids and fatty acid esters,
(B) wax, (c) higher fatty acid metal salt, (d) surfactant, (e) water, and (f) water comprising a white solid lubricant.
A lubricant composition for a soluble plunger, wherein the component (a) is mixed with the component (a) based on the total amount of the components (a) to (f).
Component 10 to 60% by weight, component (b) 1 to 15% by weight
%, Component (c) 1 to 15% by weight, component (d)
0.5 to 10% by weight, 30 to 75% by weight of the component (e)
%, And 1 to 10% by weight of the component (f) . 3. The lubricant composition for a water-soluble plunger according to claim 2, wherein said white solid lubricant is selected from the group consisting of talc, graphite fluoride and mica.