KR20040095932A - Compositions for Engine Mount Having Higher Boiling Point and Lower Viscosity - Google Patents

Abstract

PURPOSE: A composition for an engine mount having higher boiling point and a lower viscosity is provided to have an increased viscosity and an enhanced low temperature fluidity by adding a glycol ether instead of a water. CONSTITUTION: The composition for the engine mount having higher boiling point and a lower viscosity comprises 30 to 99 wt.% of glycol; and 1 to 70 wt.% of glycol ether. The glycol includes ethylene glycol, diethylene glycol, triethylene glycol, methylene glycol, dimethylene glycol, trimethylene glycol, propylene glycol, dipropylene glycol, butylene glycol and a mixture thereof. The glycol ether includes ethylene glycol ethylether, diethylene glycol ethylether, ethylene glycol methyl ether, diethylene glycol methyl ether, triethylene glycol ethyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, triethylene glycol butyl ether, polyethylene glycol methyl ether, polypropylene glycol methyl ether, dipropylene glycol methyl ether and a mixture thereof.

Description

Compositions for Engine Mount Having Higher Boiling Point and Lower Viscosity

The present invention relates to a mount liquid composition, and more particularly, to a high boiling point low viscosity mount liquid composition comprising a glycol and a glycol ether.

Mount liquid is a liquid entering the hydraulic engine mount, and serves to quickly absorb and reduce the noise and vibration of the engine generated during operation. On the other hand, the mount liquid is injected into the hermetic hydraulic engine mount to which rubber is bonded to the inner surface with iron castings, and the vibration generated by the engine absorbs the shock and vibration noise of the mount by the fluidity of the liquid through the orifice tube. Generally, mount liquids of non-mineral oil-based glycols, which are not mineral oils, are used because they take into consideration the influence on the rubber used for the mounts and the low temperature fluidity.

Looking at the composition of the mount liquid that is commonly used, there are some that is mixed with ethylene glycol in a large amount of water and a rust inhibitor.

The amount of water contained in the conventional mount liquid is usually 10-30% by weight, which is related to the freezing point and low temperature fluidity of the mount liquid. When only pure ethylene glycol is used, the low temperature liquidity of the mount liquid is poor or frozen in winter. There is a problem, the situation is to use a mixture of water to improve.

There is an advantage that the mount liquid does not freeze in winter due to the mixing of water.However, if the boiling point drops below about 110 ℃ according to the water content, and the heat transferred from the engine to the mount becomes 110 ℃ or higher, There is a problem that can not play a role. In addition, when using a high boiling point glycol in order to solve the problem of boiling, the phenomenon that the fluidity at low temperature is not good and noise vibration absorption does not occur.

Japanese Patent No. 0083426 discloses a technique in which ethylene glycol, diethylene glycol and water are used in combination. However, this technique acts as a mount liquid under limited conditions, and the freezing point rises and the low temperature fluidity worsens due to the mixing of ethylene glycol and diethylene glycol with water in winter, or the boiling point decrease due to the mixed use of glycol and water, It may cause problems such as corrosion of metal parts in the product. In addition, the Republic of Korea Patent Application Publication No. 2003-0002971 refers to a technology that uses a mixture of ethylene glycol, propylene glycol, corrosion inhibitors and water, but the low temperature fluidity in winter due to the mixed use of ethylene glycol and propylene glycol worsened and boiling point This low problem may cause the engine mount liquid to boil in summer.

The present inventors have made diligent research efforts to solve the above-mentioned problems of the prior art. As a result, when the glycol composition is included in the conventional composition instead of water, the present inventors confirmed that the mount liquid composition exhibiting increased boiling point and excellent low temperature fluidity is provided. To complete.

Accordingly, it is an object of the present invention to provide a mount liquid composition having a high boiling point and low viscosity.

Other objects and advantages of the present invention will become apparent from the following detailed description and claims.

According to an aspect of the present invention, the present invention provides an engine mount liquid composition comprising 30-99 wt% glycol and 1-70 wt% glycol ether.

As used herein, the term "mount liquid composition" is a liquid contained in an engine mount of a vehicle, preferably a hydraulic engine mount, more preferably a closed hydraulic engine mount, to absorb and reduce noise and vibration of an engine generated during operation. It means a liquid substance used for.

In the composition of the present invention, glycol is an alcohol compound having two hydroxyl groups, and any known in the art may be used, but preferably, ethylene glycol, diethylene glycol, triethylene glycol, methylene glycol, dimethylene glycol From trimethylene glycol, propylene glycol, dipropylene glycol, butylene glycol and mixtures thereof

Is selected. More preferably, suitable glycols for the compositions of the present invention are ethylene glycol, diethylene glycol, propylene glycol and dipropylene glycol, most preferably ethylene glycol and propylene glycol. Ethylene glycol and propylene glycol are the most preferred glycols because of their low temperature fluidity.

In the composition of the present invention, the content of glycol is 30-99% by weight, more preferably 50-95% by weight, most preferably 60-95% by weight based on the total weight of the composition. If the content of the glycol is less than 30% by weight, there is a problem in that the freezing point is increased, and in the case where the content of the glycol is more than 99% by weight, the kinematic viscosity is increased to lower the low temperature fluidity.

In the composition of the present invention, the glycol ether may be any known in the art, but preferably ethylene glycol ethyl ether, diethylene glycol methyl ether, ethylene glycol methyl ether, diethylene glycol methyl ether, triethylene glycol Methyl ether, diethylene glycol ethyl ether, triethylene glycol ethyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, triethylene glycol butyl ether, polyethylene glycol methyl ether, polypropylene glycol methyl ether, dipropylene glycol methyl ether and these Is selected from the group consisting of: More preferably, the glycol ethers suitable for the composition of the present invention are ethylene glycol methyl ether, diethylene glycol methyl ether, diethylene glycol ethyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether and polyethylene glycol methyl ether, most preferred. Preferably ethylene glycol methyl ether, diethylene glycol methyl ether, and diethylene glycol ethyl ether. Ethylene glycol methyl ether, diethylene glycol methyl ether and diethylene glycol ethyl ether are the most preferable glycol ethers because they have excellent low temperature fluidity and high boiling point without affecting the rubber material.

In the composition of the present invention, the content of the glycol ether is preferably 1-70% by weight, more preferably 5-70% by weight, most preferably 5-50% by weight based on the total weight of the composition. . If the content of the glycol ether is less than 1% by weight, the kinematic viscosity and freezing temperature are not affected. If the content of the glycol ether exceeds 70% by weight, the kinematic viscosity and freezing point are good, but there is a problem that adversely affects the rubber in the mount.

According to certain preferred embodiments of the present invention, the compositions of the present invention comprise 85-96% glycol and 4-15% glycol ether.

According to a preferred embodiment of the invention, the compositions of the invention are aliphatic and aromatic mono-, di- and tricarboxylic acids, triazoles, thiazoles, phosphates, boric acid compounds, silicates, molybdates, nitrate compounds and these It further comprises one or more corrosion inhibitors selected from the group consisting of alkaline earth metal salts or alkali metal salts thereof, ammonium salts thereof, amine salts thereof, isomers thereof and mixtures thereof. The preferred content of preservative is 0.01 to 10% by weight. If the content of the corrosion inhibitor is less than 0.01% by weight, corrosion may occur due to deterioration of the corrosion performance. When the content of the corrosion inhibitor exceeds 10% by weight, the stability of the mount liquid may be degraded and discoloration may occur.

More preferably, the triazoles and thiazoles as corrosion inhibitors are selected from the group consisting of benzotriazoles, tolitriazoles, mercaptobenzothiazoles, sodium salts and potassium salts thereof, wherein the nitrate compound is sodium nitrate , Sodium nitrite, potassium nitrate and potassium nitrite, the amine is selected from the group consisting of monoethanol amine, diethanol amine, triethanol amine and methyldiethanol amine, wherein the phosphate compound is orthophosphoric acid, potassium triphosphate Is selected from the group consisting of sodium triphosphate, potassium diphosphate, sodium diphosphate, sodium pyrophosphate, tripolyphosphate, tributylphosphate and hexametaphosphate, and the borate compound is selected from the group consisting of boric acid, sodium borate and potassium borate The silicate is sodium metasilicate, Rhodium is selected from ortho silicate and sodium silicate the group consisting of, wherein the molybdate is selected from the group consisting of ammonium molybdate, ammonium molybdate phosphine, sodium molybdate and potassium molybdate. Further preferred carboxylic acids as corrosion inhibitors are sebacic acid, neotecanoic acid, t -butylbenzoic acid, dodecanedioic acid, terephthalic acid, dicyclopentadienecarboxylic acid, untecandioic acid, dodecanedioic acid, phthalic acid and neooctanoic acid. , 2-ethyllexanoic acid, octanoic acid, undecanoic acid, azelaic acid, subsane acid, nonanoic acid, decanoic acid, adipic acid, heptanoic acid, hexanoic acid, benzoic acid, methylbenzoic acid, alkali and alkaline earth metal salts thereof and these Isomers are selected from the group consisting of:

Most preferably, used as the corrosion inhibitor of the present invention are methyldiethanolamine, triethanolamine, benzotriazole and tolytriazole.

According to a preferred embodiment of the present invention, the engine mount liquid composition of the present invention further comprises one or more antioxidants selected from the group consisting of dibutylhydroxy toluene, butylhydroxy anisole and triphenylphosphate. do. The suitable content of antioxidant is 0.1-5% by weight, and if it is less than 0.1% by weight, corrosion due to the mount liquid occurs due to long-term durability degradation, and if it exceeds 5.0% by weight, the stability of the mount liquid may be reduced and precipitates may be generated. high portential.

According to another variant of the invention, the composition of the present invention further comprises an alkali metal hydroxide or 1 to 35% by weight of water sufficient to adjust the pH of the composition between about 6 and about 10. Examples of the alkali metal hydroxide that can be used include sodium hydroxide and potassium hydroxide.

The mount liquid composition of the present invention has high boiling point and excellent low temperature fluidity, and is excellent in corrosion resistance to metal materials without affecting the rubber material of the engine mount. Accordingly, the mount liquid composition of the present invention solves the problem of mounting liquid boiling at high temperatures, maintains fluidity at low temperatures, and quickly absorbs noise and vibration generated from the engine even at low temperature, thereby reducing noise and vibration. It is excellent, and also prevents deterioration (oxidation) of mount liquid by heat, and is excellent in anticorrosive performance.

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention in more detail, it is to those skilled in the art that the scope of the present invention is not limited by these examples in accordance with the gist of the present invention. Will be self-evident.

Example

Next, the mount liquid composition of the present invention having the composition shown in Table 1 was prepared.

function Sample Name Example 1 Example 2 Example 3 Example 4 Example 5 Solvent Ethylene glycol 60 74 84 89 94 Propylene glycol 29 15 10 10 - Triethylene glycol - 5 - - 5 Ethylene Glycol Methyl Ether 5 - - - - Diethylene glycol methyl ether 5 - - - Ethylene glycol ethyl ether - 3 - - - Dierene glycol ethyl ether - 2 - - - Ethylene glycol butyl ether - - 3 - - Dierene glycol butyl ether - - 2 - - Metal corrosion inhibitor Methyldiethanolamine 0.4 - 0.3 0.5 - Benzoic acid - 0.3 - - 0.5 Molybdate 0.3 - - - - Benzotriazole - 0.3 0.2 - - Antioxidant Dibutylhydroxytoluene 0.3 0.2 0.2 - - Butylhydroxy Anisole - - - 0.5 - Triphenyl phosphate - 0.2 0.3 - 0.5

The unit of the numerical value of Table 1 is weight%. On the other hand, Example 4-5 does not correspond to the composition of the present invention is shown as an example for convenience.

Comparative example

As shown in the following Table 2, a conventional mount liquid composition containing water was prepared.

function Sample Name Comparative Example 1 Comparative Example 2 Comparative Example 3 Solvent Ethylene glycol 61 70 85 Propylene glycol - - - Glycol ether - - - water 39 30 15

Experimental Example

The physical properties and performance evaluations of the mount liquid composition (Table 1) and the mount liquid composition (Table 2) of the comparative example were carried out, and the results are shown in Table 3 below.

Item Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 Boiling point 180 175 185 191 205 114 116 136 Kinematic viscosity 100 ℃ 2.0 1.9 2.5 2.9 3.1 0.9 1.0 1.2 -40 ℃ 1700 1100 1500 freezing freezing 170 260 580 Rubber Swellability 70 ℃ × 120h Hardness change 0 0 0 0 0 0 0 0 Volume change -0.5 -0.4 -0.4 -0.5 -0.5 -0.2 -0.5 -0.5 Exterior clear clear clear clear clear clear clear clear Metal Corrosion Resistance 100 ℃ × 120h aluminum ± 0.1 -0.003 -0.002 -0.002 -0.003 -0.003 -0.227 -0.253 -0.241 cast iron ± 0.2 -0.003 -0.003 -0.004 -0.005 -0.005 -0.295 -0.290 -0.288 River ± 0.2 -0.004 -0.005 -0.006 -0.004 -0.005 -0.285 -0.283 -0.281 Exterior No corrosion No corrosion No corrosion No corrosion No corrosion Aluminum, Cast Iron, Steel Corrosion Aluminum, Cast Iron, Steel Corrosion Aluminum, Cast Iron, Steel Corrosion

Among the measurement results, the boiling point was measured according to the KS M 2141 5.1 item Equilibrium reflux boiling point test method, the kinematic viscosity is the result of measuring the kinematic viscosity of the mount liquid according to KS M 2014. In addition, the rubber impact was measured according to the test method of influence items on KS M 2141 5.11 rubber, and the metal corrosion resistance was measured according to the test method of KS M 2141 5.5 Corrosion item (except that the sample is a stock solution and the test piece is aluminum). , Cast iron and steel).

As can be seen in Table 3, the composition of the present invention including both glycol and glycol ether has a boiling point of 175-185 ° C., which is much higher than that of conventional mount liquids (Comparative Examples 1-3). On the other hand, the kinematic viscosity at -40 ℃ to evaluate the low-temperature fluidity is higher than the conventional mount liquid has a low temperature fluidity is reduced, but the value of Table 3 is enough to interfere with the function of the mount liquid at low temperature no. On the other hand, Examples 4 and 5, which do not contain both glycol ether and water, have greatly reduced low temperature fluidity, making the function of the mount liquid at low temperature impossible.

In addition, it can be seen that the mount liquid composition of the present invention has extremely low impact on rubber and adhesives, and in particular, excellent anti-corrosion ability, so that the discoloration and weight change rate of the test piece are small, so that the long-term durability is greatly improved.

The present invention provides a mount liquid composition having a high boiling point and low viscosity. The mount liquid composition of the present invention has high boiling point and excellent low temperature fluidity, and is excellent in corrosion resistance to metal materials without affecting the rubber material of the engine mount.

Claims (9)

An engine mount liquid composition comprising 30-99 wt% glycol and 1-70 wt% glycol ether. According to claim 1, wherein the glycol is selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, methylene glycol, dimethylene glycol, trimethylene glycol, propylene glycol, dipropylene glycol, butylene glycol and mixtures thereof Engine mount liquid composition, characterized in that. The method of claim 1, wherein the glycol ether is ethylene glycol ethyl ether, diethylene glycol ethyl ether, ethylene glycol methyl ether, diethylene glycol methyl ether, triethylene glycol methyl ether, diethylene glycol ethyl ether, triethylene glycol ethyl ether, Engine mount liquid, characterized in that selected from the group consisting of ethylene glycol butyl ether, diethylene glycol butyl ether, triethylene glycol butyl ether, polyethylene glycol methyl ether, polypropylene glycol methyl ether, dipropylene glycol methyl ether and mixtures thereof Composition. The composition of claim 1, wherein the composition comprises aliphatic and aromatic mono-, di- and tricarboxylic acids, triazoles, thiazoles, phosphoric acid compounds, boric acid compounds, silicates, molybdates, nitrate compounds and their alkaline earth metal salts or An engine mount liquid composition further comprising 0.01 to 10% by weight of one or more corrosion inhibitors selected from the group consisting of alkali metal salts, ammonium salts, amine salts, isomers thereof and mixtures thereof. The method of claim 4, wherein the carboxylic acid is sebacic acid, neotecanoic acid, t -butylbenzoic acid, dodecanedioic acid, terephthalic acid, dicyclo pentadienecarboxylic acid, untecandioic acid, dodecanedioic acid, phthalic acid, neooctanoic acid , 2-ethyllexanoic acid, octanoic acid, undecanoic acid, azelaic acid, subsane acid, nonanoic acid, decanoic acid, adipic acid, heptanoic acid, hexanoic acid, benzoic acid, methylbenzoic acid, alkali salts and alkaline earth metal salts thereof and these The triazole and thiazole are selected from the group consisting of benzotriazole, tolytriazole, mercaptobenzothiazole, sodium salts and potassium salts thereof, and the nitrate compound is nitric acid. Selected from the group consisting of sodium, sodium nitrite, potassium nitrate and potassium nitrite, the amine being a group consisting of monoethanol amine, diethanol amine, triethanol amine and methyldiethanol amine Wherein the phosphate compound is selected from the group consisting of orthophosphoric acid, potassium triphosphate, sodium triphosphate, potassium diphosphate, sodium diphosphate, sodium pyrophosphate, tripolyphosphate, tributylphosphate and hexametaphosphate, and the boric acid compound is Selected from the group consisting of boric acid, sodium borate and potassium borate, wherein the silicate is selected from the group consisting of sodium metasilicate, sodium ortho silicate and sodium silicate, and the molybdate is ammonium molybdate, ammonium phosphmolybdate , Sodium molybdate and potassium molybdate selected from the group consisting of. The method of claim 1, wherein the composition further comprises 0.1-5% by weight of one or more antioxidants selected from the group consisting of dibutylhydroxy toluene, butylhydroxy anisole and triphenylphosphate. An engine mount liquid composition. 2. The engine mount liquid composition of claim 1 wherein the composition further comprises an alkali metal hydroxide or 1 to 35 weight percent water sufficient to adjust the pH of the composition to between about 6 and about 10. 2. The engine mount liquid composition of claim 1 wherein the boiling point of the composition is 140-190 ° C. The engine mount liquid composition according to claim 1, wherein the content of glycol is 70-98% by weight and the content of glycol ether is 2-30% by weight.