JPH041796B2 - - Google Patents

Description

[Detailed description of the invention]

Industrial Application Fields The present invention is useful for joining rubber ring type joints used for vinyl pipes, reinforced plastic composite pipes, asbestos pipes, etc., as well as push-on joints such as tight joints used in cast iron pipes for water service. Regarding the lubricant used for joints. Conventional technology Conventionally, rubber ring type joints such as tight joints can be easily and reliably connected by simply inserting the tip into a socket fitted with a rubber ring and pressing it with a simple joining device such as a fork or jack. Because they can be joined and maintain complete watertightness, they are attracting attention and becoming increasingly popular as joints for various types of water conduction pipes, pipes for treating various factory waste liquids, pipes for transporting chemical liquids, etc. However, when joining the above rubber ring type joint,
In order to facilitate pressure insertion of the pipe, a lubricant is generally applied between the outside surface of the insertion port and the inside of the rubber ring.
This lubricant must not only have excellent lubricity and the ability to reduce insertion resistance during joining, but also have good application properties that do not impair the speed-up properties of the joint work, which are the original characteristics of rubber ring joints. Workability, especially moderate viscosity unaffected by climatic conditions, etc.
It is required to have plasticity, uniformity of components, etc., and characteristics that do not cause adverse effects such as deterioration and corrosion on rubber rings and pipe materials. Furthermore, when the above-mentioned joint pipe is used as a conduit for tap water or the like, it is also required to have properties that prevent harmful components from eluting into the fluid within the pipe or from mixing with components that cause so-called scum and the like. In the past, little consideration was given to the lubricant for the joints, and a paste of fatty acid soap with lubricant properties was used, but in recent years, rubber ring type joints have been used to join large diameter pipes of 600mmφ or more. As this work has become more practical, lubricants are required to have even better insertion resistance reduction properties, and conventional lubricants of this type are no longer able to satisfy this required performance. In other words, fatty acid alkali metal soaps are usually solid at room temperature, and when used as this type of lubricant, they are diluted with water to form a soft paste in consideration of ease of application. In order to make a soft paste with good properties, a considerable amount of water is required, and such dilution with water reduces the concentration and application amount of the soap itself as a slippery component, and based on this, the slipperiness or The property of reducing insertion resistance is impaired, and when joining large-diameter pipes, there is a risk that the joining equipment may be damaged or the joining wire rope may be cut. Problems to be Solved by the Invention The present invention can be used as an alternative to conventional lubricants for rubber ring type joints, and also satisfies all of the above characteristics required of this type of lubricant, and is particularly excellent in reducing insertion resistance. The purpose is to provide a new lubricant for joints. Means for Solving the Problems That is, the lubricant composition of the present invention is used for joining rubber ring type joints, which contains at least one selected from alkali metals of fatty acids having 8 to 24 carbon atoms, ammonia, and lower amines. Contains one type of soap and at least one oily agent selected from the group consisting of animal and vegetable oils, mineral oils, fatty acid esters, dibasic acid esters, phosphoric acid esters, chlorinated paraffins, polyolefins, and polyethers. The present invention relates to a lubricant composition for rubber ring type joints, which is characterized in that it is in the form of a paste or a viscous liquid. The lubricant composition of the present invention has at least one soap selected from alkali metal fatty acids having 8 to 24 carbon atoms, ammonia, and lower amines as one essential component. The fatty acids mentioned above may be linear or branched, and may be saturated or unsaturated. Specific examples include caprylic acid, capric acid,
Saturated straight chain fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid, pelargonic acid, hedecanoic acid, tridecanoic acid, pentadecanoic acid, heptadecanoic acid, nonadecanoic acid, heneicosanoic acid, tricosanoic acid, etc. ; isocaprylic acid, isocapric acid, isolauric acid, 11-methyl-todecanoic acid,
Isomyristic acid, 13-methyl-tetradecanoic acid, isopalmitic acid, 15-methyl-hexadecanoic acid, isostearic acid, 17-methyl-octadecanoic acid, isoarachidic acid, 19-methyl-eicosanoic acid, α-ethyl-hexanoic acid, α -Hexyldecanoic acid, α-heptylundecanoic acid, 2-decyltetradecanoic acid, 6-methyl-octenoic acid, 8-
Methyl-decanoic acid, 10-methyl-dodecanoic acid, 12
- Saturated branched fatty acids such as methyl-tetradecanoic acid, 14-methyl-hexadecanoic acid, 16-methyl-octadecanoic acid, 18-methyl-eicosanoic acid; caproleic acid, Linderic acid, Lauroleic acid, Tuduic acid, Fisetoleic acid, Myrist Oleic acid, palmitoleic acid, petroselic acid, oleic acid, elaidic acid, vaccenic acid, cadreic acid,
Cis-11-eicosanoic acid, cetoleic acid, erucic acid, ceracoleic acid, 17-hexacosenoic acid, 6,
9,12,15-hexadecatetraenoic acid, linoleic acid, linolenic acid, α-eleostearic acid, β-
Eleostearic acid, punicic acid, 6,9,12,15
-Octadecatetraenoic acid, parinaric acid, arachidonic acid, 5,8,11,14,17-eicosapentaenoic acid, 7,10,13,16,19-docosapentaenoic acid, 4,7,10,13, Examples include unsaturated fatty acids such as 16,19-docosahexaenoic acid. One type of these fatty acids can be used alone, or two types can be used alone.
It is also possible to use a mixture of more than one species. When two or more types are used, for example, tall oil fatty acids, lanolin fatty acids, rice sugar fatty acids, palm fatty acids, rapeseed oil fatty acids, soybean oil fatty acids, coconut oil fatty acids, etc. can be advantageously used. The above-mentioned various fatty acids usually have an acid value in a range of about 100 to 500, and are suitable for the present invention. Among the above-mentioned fatty acids, straight-chain saturated fatty acids in particular can exhibit the most excellent lubricating effect when used as a soap, but when preparing the lubricant composition of the present invention,
There is a tendency for the preparation workability to be slightly inferior, and in this case, it is preferable to use branched chain saturated fatty acids or unsaturated fatty acids together. In order to obtain the above-mentioned fatty acid soap, in the present invention, as the alkali, hydroxides of alkali metals such as sodium and potassium, ammonia and monoethanolamine, triethanolamine, triethylamine, morpholine, N,N-dimethylethanolamine, Lower amines such as N,N-diethylethanolamine are used. The alkali metal hydroxide and ammonia are usually used in the form of an aqueous solution. The concentration of the aqueous solution is not particularly limited as long as a soap can be obtained by reacting the aqueous solution with the above fatty acid, and it can be about 1% to saturated concentration, but it is usually preferably around the saturated concentration, for example about 30 to 50%. It is preferable to use % concentration. The neutralization reaction of fatty acids with an alkali is carried out by adding and dissolving the fatty acids in an aqueous alkaline solution or liquid amine according to a conventional method. The amount of alkali used is usually an amount that completely saponifies the fatty acid, but it may be slightly more or less than its theoretical equivalent. Among the alkalis mentioned above, alkali metals such as sodium and potassium are particularly preferred because they can provide a soap with the best lubricating effect and are odorless, and lower amines are preferred from the viewpoint of workability of the resulting lubricant. In the present invention, in addition to the above fatty acid soap, at least one oily agent selected from the group consisting of animal and vegetable oils, mineral oils, fatty acid esters, dibasic acid esters, phosphoric acid esters, chlorinated paraffans, polyolefins, and polyethers is added. It is important to use it as an essential component. Examples of each compound contained in the above-mentioned oily agent are as follows. That is, examples of animal and vegetable oils include vegetable oils and vegetable fats such as soybean oil, rapeseed oil, cottonseed oil, rice bran oil, linseed oil, castor oil, coconut oil, palm oil, and tall oil;
Examples include animal fats and oils such as lard, beef tallow, mutton tallow, and whale oil. Examples of the mineral oil include various oils commonly known as petroleum-based lubricating oils, such as spindle oil and neutral oil. Fatty acid esters, dibasic acid esters, phosphoric acid esters, epoxidized fatty acid esters, and chlorinated paraffins are generally well-known as plasticizers for plastics. Among these, fatty acid esters include butyl stearate, butyl oleate, etc. , methyl acetyl ricinolate, methyl rapeseed fatty acid, methyl castor oil fatty acid, isopropyl myristate, isopropyl palmitate, methyl oleate, octyl palmitate, isobutyl tallow fatty acid, epoxidized soybean oil, butyl epoxy stearate, octyl epoxy stearate , acetylated castor oil fatty acid methyl, alkyl esters of the above fatty acids such as methyl stearate pentachloride, and derivatives of the fatty acids (epoxidized products, acetylated products, chlorides, etc.)
esters, etc. are included. Examples of dibasic acid esters include dibutyl phthalate, dioctyl phthalate, butyl lauryl phthalate, butylbenzyl phthalate, ditridecyl phthalate, tributyl citrate, dioctyl adipate, dioctyl azelate, dioctyl sebacate, dioctyl phthalate, di-(2-ethylhexyl )
Alkyl esters of dibasic acids such as adipate, di-(2-ethylhexyl) isosebacate, etc.; )
Phosphate, triphenyl phosphate, etc. are included, respectively. Further, in the present invention, as the oily agent, for example, polyolefins such as polyalphaolefin and polybutene, and polyethers such as monoalcohol ether of polyoxyethylene polyoxypropylene copolymer can also be used.
Each of the above-exemplified oily agents can be used alone or in combination of two or more. Among these oil-based agents, those that have particularly good compatibility with the soap and can maintain a homogeneous state of the mixture for a long period of time are preferred. For example,
Examples include animal and vegetable oils and fatty acid esters containing the same fatty acid components as the fatty acids constituting the soap, and polyethers and the like are also preferred because they have excellent compatibility with soaps. The ratio of the above soap and oily agent to be used is determined as appropriate depending on the type of each component, etc., but usually soap 99
-20% by weight of oil-based agent to 1-80% by weight, preferably 90-50% of soap to 10-50% by weight of oil-based agent, and by using both within this range,
An excellent joint lubricant composition in the early stage of the present invention can be obtained. It is still not clear why a lubricant with excellent properties, especially a markedly reduced insertion resistance, and good workability can be obtained by using the above soap in combination with an oil-based agent, but the above soap is usually used as a lubricant. This is thought to be because while it functions as a tactility-imparting component, it is quite hard, and when used together with an oily agent, it is softened, promoting the lubricity-imparting effect and improving workability. The composition of the present invention is easily prepared by simply mixing the soap and the oily agent. In addition, when using animal and vegetable oils or fatty acid esters as oily agents,
By partially neutralizing these with an alkali used for preparing the fatty acid soap described above, the composition of the present invention may be obtained without separately preparing and blending the fatty acid soap. That is, according to the above partial neutralization, a part of the fatty acid glyceride constituting the fatty acid ester or animal and vegetable oil is hydrolyzed to produce the desired fatty acid soap, and the unreacted fatty acid ester or animal and vegetable oil as an oily agent is mixed with the desired fatty acid soap. A mixture is obtained. This partial neutralization can be carried out in the same manner as the usual alkaline hydrolysis reaction of esters. However, the alkali used at that time is
The amount of soap and oily agent present in the above-mentioned predetermined proportions in the resulting composition, i.e., 99 to 20%, preferably, based on the raw material to be partially neutralized.
The amount should be 90-50% neutralizing. Of course, the composition of the present invention obtained by partial neutralization as described above is a mixture of a fatty acid soap and an ester or oil having the same fatty acid component, but it may also contain other fatty acid soaps as necessary. It is also possible to add and blend oily agents within the above-mentioned ranges. For example, when using an aqueous solution of an alkali metal hydroxide as an alkali, the composition of the present invention thus obtained can be formed into a desired paste-like or viscous liquid form with good workability by using only the amount of water used to prepare the aqueous solution. It can be used as a lubricant as it is. Furthermore, when using a liquid amine such as triethanolamine, it is possible to prepare the desired paste form without adding water separately, but according to the research of the present inventors, the composition of the present invention can be used as a lubricant. A particularly suitable viscosity for use is approximately 500
It has been confirmed that it is ~50,000 cps (30℃),
For example, when commercially available fatty acid soaps are used, the viscosity may fall outside the above-mentioned preferred range or may not form a paste or viscous liquid. In such a case, a small amount of water may be further added to the resulting composition to form the desired paste-like or viscous liquid form;
Its viscosity can be within the above range. In addition, although not particularly necessary, a humectant or humectant may be further added to the composition of the present invention in order to enhance the storage stability of the composition and prevent formation of a dry film or coagulation. It is. Alcohols are particularly preferred as the humectant or humectant. Specific examples of the alcohols include lower alcohols such as methanol, ethanol, and isopropanol, as well as ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol,
Examples include polyhydric alcohols such as polypropylene glycol, polyethylene glycol/polypropylene glycol copolymer, chrycerin, pentaerythritol, trimethylolpropane, and sorbitol. The amount of the polyhydric alcohol to be used can be selected as appropriate, but it is usually preferably up to about the same weight as the solid weight of the composition of the present invention. By addition and blending of the polyhydric alcohol described above, the viscosity of the composition may be adjusted or a desired paste-like or viscous liquid form may be prepared in the same way as with the addition of water. When the lubricant composition for rubber ring type joints of the present invention thus obtained is used for joint joining work, it can be applied with a brush or by hand in the same manner as conventional lubricants of this type. In particular, the composition of the present invention has appropriate plasticity and viscosity, has little change in viscosity due to temperature, and is suitable for use during the above-mentioned application process.
Even if there is a considerable open time during the pipe joining operation after the coating is completed, there is no risk of deterioration of the desired lubricant properties, and the lubricant can always consistently exhibit good lubricity or insertion resistance reduction properties. In addition, the compositions of the present invention are resistant to rot and are not likely to attack tubing materials such as rubber, plastics, metals, etc. Examples Examples will be given below to explain the present invention in more detail. In addition, the middle part and % in each example are based on weight. Example 1 A fatty acid soap was prepared by using 40 parts of olefiic acid as a fatty acid and mixing it with 23 parts of a 35% aqueous potassium hydroxide solution. Methyl oleate as an oily agent in the above soap
10 parts were added and mixed to obtain a composition of the present invention. This product was designated as lubricant No. G-1. Examples 2 to 9 In the above Example 1, predetermined amounts of each alcohol shown in Table 1 were added and mixed together with methyl oleate to obtain a composition of the present invention. The obtained compositions are designated as lubricant Nos. G-2 to G-9. Example 10 37 parts of oleic acid to 80% triethanolamine 20 parts
13 parts of methyl oleate was added thereto to obtain a composition of the present invention (lubricant No. G-10). Table 1 shows the appearance of the composition obtained above and the PH of a solution diluted with distilled water to a concentration of 2% using PH test paper manufactured by Toyo Shisha Co., Ltd.

[Table] Examples 11 to 18 40 parts of oleic acid is mixed with various alkalis listed in Table 2 to make soap, and methyl oleate is added to the soap.
10 parts, along with 15 parts of glycerin and 10 parts of methanol (however, for lubricant No. B-6, it was 15 parts of glycerin + 8 parts of methanol, and for No. B-8, it was 8 parts of methanol).
The compositions of the present invention (lubricant No. B-1 to
B-8) was obtained. Table 2 also shows the appearance and 2% aqueous solution pH of each composition obtained.

[Table] Examples 19 to 29 and Comparative Example 1 The compositions of the present invention (Lubricant Nos. A-1 to A-11) and the comparative composition ( Lubricant No. a-1) was obtained.

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[Table] Le

[Table] Examples 30 to 36 and Comparative Examples 2 and 3 As shown in Table 4, the composition of the present invention (Lubricant No. C- 1 to C-7) were obtained. Table 4 also shows the cases of potassium oleate soap alone (Lubricant No. c-1) and methyl oleate alone (Lubricant No. c-2) for comparison.

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[Table] Examples 37 to 57 Various oily agents shown in Table 5 were added to potassium oleate soap, and the compositions of the present invention (lubricants No. F-1 to F-21) were prepared in the same manner as in Example 11. Obtained.

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[Table] However, the following oil-based agents were used in lubricant Nos. F-17 to F-21 in Table 5. Lubricant No.F-17……Neutral oil (viscosity
15cst/210〓), Nippon Oil Products) Lubricant F-18...Polyalphaolefin (PAOL400, Bray oil Co. (USA) product) Lubricant F-19...Polybutene (HV-100, Nippon Petrochemical Products) Lubricant F -20...Hindered ester (H-381,
Lubricant F-21...Polyether (LB-1715, Sanyo Chemical Products) Examples 58 to 60 and Comparative Example 4 To 50 parts of rice bran fatty acid methyl, a predetermined amount of KOH aqueous solution of various concentrations was added, and well The above ester was subjected to alkaline hydrolysis by stirring and mixing. Add and mix 15 parts of glycerin and 6.6 parts of methanol to this,
Lubricant compositions (Lubricant Nos. D-1 to D-4) containing potassium soap of rice bran fatty acid and methyl rice bran fatty acid of the present invention shown in Table 6 below were obtained. Table 6 shows a composition without alkali additive (lubricant No. d-
1) should also be written.

[Table] Examples 62 to 73 In place of methyl rice bran fatty acid, 50 parts of each oil or fat or fatty acid ester listed in Table 7 below was used, and in the same manner as in Example 58, this was partially alkaline hydrolyzed, Composition of the present invention (Lubricant No. E-1 to E-12)
obtained each of them.

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[Table] A joining test was conducted using the lubricant materials for joints obtained in each of the above examples and comparative examples. The test method and results are shown below. The test conditions are as follows. (1) Fitting: Nominal 75 ductile cast iron pipe insertion opening outer diameter
D ₂ 96.0mm Socket inner diameter (throat) 97.35mm Socket inner diameter (gasket sheet) D ₇ 109.9mm (2) Rubber ring: One of the following three types was used.

[Table] (3) Test method: At room temperature (18-22℃), apply each lubricant sample to the joints (joint insertion opening and rubber ring) and immediately conduct a joint test. The insertion force (resistance value) is measured at a certain distance from the insertion end (insertion length;
Read the push-in oil pressure (Kg/cm ² ) with the oil pressure gauge when inserted up to mm). The results are shown as the average value obtained by repeating the same test three times. (4) Results: Shown in Tables 8-a to 8-g below.

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[Table] Graphs plotting representative examples of the results shown in the above tables are shown in FIGS. 1 to 3. In each figure, the horizontal axis shows the insertion length (mm), and the vertical axis shows the insertion force (resistance; Kg/cm ² ).
The results shown in the table above are illustrated. From the above tables and figures, it can be seen that the composition of the present invention is extremely excellent as a lubricant for rubber ring type joints. Regarding lubricants No. A-8 and D-3, the results were obtained by subjecting them to the same test as above (using No. 2-7 as a rubber ring, at a temperature of 20°C), and the results obtained by applying the same.
The results of the same bonding test after being left for a few minutes are
It is shown in Table 9 below.

[Table] From Table 9 above, it can be seen that the excellent insertion resistance lowering properties of the composition of the present invention remain substantially unchanged even after 20 minutes of open time. Comparative Example 5 A mold release agent for wooden molds having the following composition was prepared according to the description in Japanese Patent Publication No. 47-48772.

[Table] Using the above sample, the same bonding test as above was conducted using the following rubber ring (No. 104). Rubber ring heel outer diameter (mm) 111.10 Valve outer diameter (mm) 111.95 Valve thickness B (mm) 12.63 Heel hardness (JIS-K-6301) (HS) 80 Valve hardness (JIS-K-6301) (HS) 55 Compression Rate (%) 45.0 The results obtained are shown in Table 10 below. Table 10 shows lubricant composition No. of the present invention prepared in Example 61 above.
The same test results using D-4 are also listed.

【table】

[Table] From the above table, it can be seen that the wood mold release agent described in Japanese Patent Publication No. 47-48772 can exhibit practical insertion resistance reduction properties even when applied as a lubricant for rubber ring joints. It turns out there isn't. In addition, since this material is not soluble in water, it cannot be washed away after the above test, causing oil to float inside the pipe and cause contamination.Since it is mainly composed of mineral oil, this corrodes the rubber and deteriorates the sealing performance. Moreover, since it is not paste-like, it has the disadvantage of poor application workability.

[Brief explanation of drawings]

1 to 3 are graphs showing the insertion resistance when a bonding test was conducted using the lubricant composition of the present invention.

Claims (1)

[Claims] 1 A lubricant composition used when joining rubber ring type joints, comprising at least one soap selected from alkali metals of fatty acids having 8 to 24 carbon atoms, ammonia, and lower amines, animal and vegetable oils, mineral oils,
At least one selected from the group consisting of fatty acid ester, dibasic acid ester, phosphoric acid ester, chlorinated paraffin, polyolefin, and polyether
1. A lubricant composition for rubber ring-type joints, characterized in that it contains a type of oil-based agent and is in the form of a paste or a viscous liquid.