Background technology
Soap-base lubricant is the lubricating grease that fatty acid soaps make thickening agent.Common are calcium base, anhydrous calcium base, composite calcium-base,
The lubricating grease such as Composite calcium-sulfonate-batetrapolyurea, sodium base amine sodium base, aluminium base, composite aluminum base, lithium base, compound lithium base.Calcium sodium base, barium base and lead base
Lubricating grease has been eliminated.Since the characteristic of various aliphatic acid is different, the performance of obtained lubricating grease is also different.
It is to make thickening agent with fatty acid soaps that lubricating grease, which has 90%, i.e., saponification system occurs with alkali with fat or aliphatic acid
At.Common fat and aliphatic acid have butter, lard, cotton seed oil, stearic acid, 12- carboxyl stearic acid etc., also have using oxidation stone
Synthetic fatty acid made of wax, but effect is not as good as natural acid.Bases used is generally the hydrogen of alkali and alkaline earth metal ions
Oxide, such as sodium hydroxide, calcium hydroxide, lithium hydroxide.
Soap-base lubricant is widely used because having good lubrication and protective action to mechanical part.But existing
In technology, conventional fat saponification technique needs high temperature to react for a long time, and general saponification temperature needs to be more than 100 DEG C, saponification
At least 3~4 hours time, reaction efficiency is low, high energy consumption, can not adapt to current growing lubricant demand.Therefore, having must
Research and develop the soap-base lubricant that a kind of Saponification Conditions are mild, saponification time is short.
Invention content
The object of the present invention is to provide a kind of preparation method of soap-base lubricant, the preparation method mild condition, instead
It is short between seasonable, the efficiency of reaction can be effectively improved, energy consumption is reduced.
The invention is realized by the following technical scheme:
A kind of preparation method of soap-base lubricant, comprises the steps of:
1) emulsifier of grease, HLB value < 6 is uniformly mixed, obtains oil phase, water, polyalcohol are uniformly mixed, water is obtained
Water phase A is slowly added to continue to stir in oil phase to emulsify, obtains lotion a, lotion a is that oil wraps by phase A after being sufficiently stirred
The lotion of water-bound;
2) polyalcohol, the emulsifier of HLB value > 15, water are uniformly mixed, obtain aqueous phase B, by the lotion a obtained by step 1)
It is added in aqueous phase B to continue to stir under stiring and be emulsified, obtain lotion b, lotion b is the lotion of W/O/W structure;
3) potassium hydroxide, water are mixed to get potassium hydroxide solution, then add the lotion b that step 2) obtains under stiring
Enter into potassium hydroxide solution and carry out saponification, obtains soap-base lubricant.
Preferably, the emulsifier of 40~48% greases, 3~5%HLB values < 6 is uniformly mixed by the step 1), obtains oil
3~5% water, 4~6% polyalcohols are uniformly mixed, obtain water phase A by phase;It is highly preferred that the step 1) is oily by 42~46%
Fat, the emulsifier of 3.5~4%HLB values < 6 are uniformly mixed, obtain oil phase, and 3.5~4% water, 5~5.5% polyalcohols are mixed
Uniformly, water phase A is obtained.
Preferably, after step 1) the water phase A is sufficiently stirred under the mixing speed of 1000~1200rpm, water phase A is delayed
Continue stirring in slow addition oil phase to be emulsified, emulsifying temperature is 40~50 DEG C, and emulsification times are 25~35min, obtain lotion
A, lotion a are the lotion of Water-In-Oil structure.
Preferably, the step 2) mixes 4~6% polyalcohols, the emulsifier of 2~3%HLB values > 15,7~12% water
Uniformly, aqueous phase B is obtained;It is highly preferred that the step 2) is by 4.5~5% polyalcohols, the emulsifier of 2~3%HLB values > 15,8
~10% water is uniformly mixed, and obtains aqueous phase B.
Preferably, step 2) the lotion a, which is added under the mixing speed of 600~800rpm in aqueous phase B, continues to stir
It is emulsified, emulsifying temperature is 30~40 DEG C, and emulsification times are 20~30min, obtains lotion b, and lotion b is W/O/W knot
The lotion of structure.
Preferably, 10~15% potassium hydroxide, 10~15% water are mixed to get potassium hydroxide solution by the step 3);More
Preferably, 11~13% potassium hydroxide, 13~15% water are mixed to get potassium hydroxide solution by the step 3).
Preferably, step 3) the lotion b be added under the mixing speed of 600~800rpm in potassium hydroxide solution into
Row saponification, it is 40~50 DEG C to keep reaction temperature, reacts 50~80min.
Above-described percentage is that constituent mass accounts for the percentage for preparing raw material gross mass needed for the soap-base lubricant
Than.
Preferably, the polyalcohol is the compounding of one or more of propylene glycol, glycerine, sorbierite.
The principle of the present invention is:By first being slowly added to step 1) the water phase A to be stirred emulsification in oil phase, formed
The lotion a of Water-In-Oil structure;Then lotion a is slowly added in step 2) be stirred emulsification in aqueous phase B, is further formed
The lotion of W/O/W structure reaches microemulsified effect, and the grain size of lotion is 50~100nm, keeps grease anti-in progress saponification
It should adequately have been disperseed before, increase the surface area that grease is contacted with lye in saponification, be conducive to the progress of reaction.
It in saponification process, will not be demulsified, only intermediate layer material changes, and after reaction, oil layer becomes aliphatic acid
Soap layer is wrapped up by the water layer of oil layer package by fatty acid soaps before reaction, and water is evenly distributed on fatty acid soaps internal layer, becomes lubrication
The peptizing agent of agent.The present invention due to preparation process unlike the prior art so that the microstructure of lubricant is moistened with conventional soap base
Lubrication prescription is different, and performance, which also obtains, significantly to be promoted.
The present invention has the advantages that compared with prior art:
1. grease microemulsified before saponification forms the lotion of W/O/W structure, adequately disperseed, in soap
Change and increase the surface area that grease is contacted with lye in reaction, improves reaction rate, 95 were foreshortened to from 3~4 hours of the prior art
~145 minutes, and saponification is easier to make under mild reaction conditions, it is anti-more than 100 DEG C from the prior art
Temperature is answered to drop to 30~50 DEG C;
2. the present invention is not in be demulsified and destroy the emulsion structure of W/O/W in saponification process, in reaction process
In only intermediate layer material change, after reaction, oil layer becomes fatty acid soaps layer, the water wrapped up by oil layer before reaction
Layer is wrapped up by fatty acid soaps, is evenly distributed on fatty acid soaps internal layer, is become the peptizing agent of lubricant, wrapped moisture is difficult to steam
Hair, reduces the evaporativity of lubricant, keeps lubricant more stable, improves the performance under hot conditions;
3. emulsion state makes lubricant have better adhesiveness, it can preferably be adhered in machinery equipment, have simultaneously
There is better mobility, reduces resistance when machine run, reduce the loss of power.
Specific implementation mode
Below by way of specific embodiment, the invention will be further elaborated.
In embodiment of the present invention, the grease used is coconut oil, castor oil, cottonseed oil, palm oil, palm kernel
One or more mixtures in oil, rape oil, tallow oil;The emulsifier of HLB value < 6 be selected from ethoxylated dodecyl alcohol -2,
In ethoxylated dodecyl alcohol -3, ethoxylated dodecyl alcohol -7, ethoxylated dodecyl alcohol -9, Span-80, this disk -60
The emulsifier of one or more kinds of compoundings, HLB value > 15 is selected from polyethers L35, sldium lauryl sulfate, enuatrol, Tween-20
One or more of compounding, the polyalcohol used is selected from propylene glycol, glycerine, one or more of sorbierite
Compounding.
The soap-base lubricant in various embodiments of the present invention is prepared by the following method:
1) emulsifier of grease, HLB value < 6 is uniformly mixed, obtains oil phase, water, polyalcohol are uniformly mixed, water is obtained
Water phase A is slowly added to continue to stir in oil phase to emulsify, obtains lotion a, lotion a is that oil wraps by phase A after being sufficiently stirred
The lotion of water-bound;
2) polyalcohol, the emulsifier of HLB value > 15, water are uniformly mixed, obtain aqueous phase B, by the lotion a obtained by step 1)
It is added in aqueous phase B to continue to stir under stiring and be emulsified, obtain lotion b, lotion b is the lotion of W/O/W structure;
3) potassium hydroxide, water are mixed to get potassium hydroxide solution, then add the lotion b that step 2) obtains under stiring
Enter into potassium hydroxide solution and carry out saponification, obtains soap-base lubricant.
The specific component of each embodiment and the reaction condition of preparation are as shown in following table -1:
Table -1
The lubricant that soap-base lubricant obtained by embodiment 2 is synthesized with conventional saponification method is subjected to contrast test, test
As a result as shown in following table -2.
Table -2
From the contrast test result of table -2 as it can be seen that the soap synthesized compared to the lubricant that conventional saponification method synthesizes, embodiment 2
Base lubricating agent has higher dropping point, heat resistance more preferable;Divide oil cut rate low, the colloid stability under hot conditions is good, in machine
It is not easy a point oily phenomenon occur in operation;Evaporation capacity is low, and oxidation stability is good, and water leaching number of dropouts is low, more stablizes;It is similar
Viscosity is low, and friction loss is small in machine running process, and greasy property is more preferable.