JP2003147088A - Method for producing soap-free wax emulsion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a high performance wax emulsion excellent in dilution stability, preservation stability (storage stability), miscibility with alcohol, generating little separation, viscosity increase and the like and mild to the environment without using a surfactant for emulsifying the wax. SOLUTION: This method for producing a soap-free wax emulsion is to (1) roughly emulsify a composition containing (a) an oxidized wax and (b) a basic compound as essential ingredients by a phase transfer method, (2) homogeneously disperse the mixture by a high speed agitator (homomixer), subsequently (3) micronize the wax by a high pressure homogenizer (homogenizer) having >=100 kg/cm<2> pressure.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for producing a soap emulsion of a soap-free type (that is, a surfactant is not used for wax emulsification). More specifically, in the present invention, an oxidized wax is used as a wax, and a basic substance (for example, a volatile organic amine) is added to the wax to neutralize the acid groups of free fatty acids in the wax, The present invention relates to a method for producing a wax emulsion in which stable fine particles are formed by mechanical force after partial or complete saponification. The soap-free wax emulsion obtained by the production method of the present invention is suitably used, for example, as a protective polish for household flooring materials, a rust preventive, a water repellent, and an additive for a thermal transfer ribbon.

[0002]

BACKGROUND OF THE INVENTION Wax emulsions are floor waxes, car waxes, rust preventive waxes, water repellents for paper products,
It is used for various purposes in various fields, including additives for thermal transfer ribbons and fiber sizing aids. By the way, this wax emulsion usually contains a surfactant for the purpose of emulsifying the wax. With respect to this surfactant, however, the problem of environmental hormones has recently been pointed out, and the viewpoint of global environment and ecosystem conservation. Therefore, there is an urgent social need to reduce the amount of surfactants in wax emulsions. On the other hand, it is also known that when a wax emulsion contains a surfactant, various properties such as water resistance, blocking resistance and antifouling property of the wax are remarkably lowered. For example, when a wax emulsion containing a surfactant is used as an additive for a thermal transfer ribbon, it induces a decrease in the print definition, blocking resistance, scratch resistance, water resistance, adhesion, etc. of the thermal transfer ribbon. For the above reasons, there is a strong demand for a method for producing a wax emulsion in which a wax is emulsified without using a surfactant.

[0003]

Problem to be Solved by the Invention Problem to be Solved by the Invention (Objective)
Is a high-performance wax that does not use a surfactant for wax emulsification, has excellent dilution stability, storage stability (storage stability), alcohol miscibility, little separation or thickening, and is environmentally friendly. It is to provide a method for producing an emulsion.

[0004]

Means for Solving the Problems As a wax emulsification technique using a surfactant, a conventional method (coarse emulsification by phase inversion method) + (high-speed stirrer) (for example, homomixer) + (high pressure homogenization) will be described later. A method for stabilizing fine particles of wax by a series of mechanical forces of a machine) (for example, a homogenizer) is known. On the other hand, by mixing a basic substance with the oxidized wax,
When the saponification and formation of the fatty acid salt contained therein are attempted,
It is also known that a self-emulsifying action is exerted. The present inventor thought that it would be possible to emulsify the wax without using a surfactant by using these two methods together, and conducted an experiment to gradually reduce the amount of the surfactant. As a result, the phase inversion state gradually deteriorates as the amount of the surfactant is reduced, and when the homomixer is stopped stirring, large particles are precipitated, which is then homogenized (pressure: 50-
Even when treated with 100 kg / cm ² ), the above high-performance wax emulsion was not obtained.

[0005] However, in an attempt, an oxide wax was used as a wax.
And use a homogenizer pressure of 100 kg /
cm²When adjusted and processed as described above, it is practical
The resulting emulsion is obtained, especially the pressure of the homogenizer
300-600 kg / cm ²Up to a homogeneous and good
It was found that an emulsion can be obtained. And pull
After further examination, The amount of basic substance added depends on the acid value and saponification value of the oxidized wax.
The theoretical amount calculated from
And the minimum number of moles of caustic potash required for complete saponification. )
A good emulsion is obtained even with a significantly lower amount
Be done, The oxidation wax has an acid value of 5 to 150 and a saponification value of
50-250 oxidized wax, as well as basic substances
Volatile organic amines or ammonia
And in addition 90% by weight or less of non-oxidized wax in oxidized wax
Even if used together, a good emulsion can be obtained.
I saw it. After that, the type of oxidative wax and volatile organic amine
Carefully study the amount used and other optimum emulsification conditions,
The present invention has been completed.

The configuration of the present invention will be specifically described below. Oxidized Wax As the oxidized wax, any acid value and saponification value can be used, but the acid value is preferably 5 to 15
0 / saponification value of 50 to 250, more preferably acid value of 7 to
100 / saponification value is 50 to 200, particularly preferably an acid wax having an acid value of 10 to 80 / saponification value of 60 to 150. Specifically, candelilla wax, carnauba wax, rice wax, wood wax, jojoba oil, beeswax,
Examples include natural waxes selected from lanolin and synthetic waxes such as oxidized micro, oxidized polyethylene, maleic acid modified polymers, montan modified waxes. Among the above natural waxes, candelilla wax and beeswax contain 10 to 20% of free fatty acids, so that they have excellent emulsifying properties. Among synthetic waxes, maleic acid-modified polymers and montan-modified waxes have acid values and saponifications. It is more preferably used because it has high value and excellent emulsification property.

Basic substance There is no limitation on the basic substance as long as it has a function of saponifying the oxidized wax and neutralizing the fatty acid contained therein. Examples include caustic alkalis such as sodium, volatile organic amines, and ammonia. Among them, volatile organic amines and ammonia that do not remain in the wax and do not reduce the water resistance are preferable, and volatile organic amines are recommended from the viewpoint of irritating odor.

As the volatile organic amine, morpholines, alkylamines, alkanolamines and the like are preferable. Further, as the morpholines, morpholine, methylmorpholine, and ethylmorpholine are more preferable, as the alkylamine, low molecular weight mono-trimethylamine and mono-triethylamine, and as the alkanolamine, mono-triethanolamine is more preferable. The volatile organic amines (1) to (3) can be selected depending on the application, but morpholine is particularly preferable in terms of volatility, promotion of neutralization and saponification, and emulsion stability. The amount of basic substance added is
It is 10 to 130 mol% of the theoretical amount calculated from the acid value and saponification value of the above-mentioned oxidized wax, and preferably 20 to 12
It is 0 mol%, more preferably 30 to 110 mol%.
If the blending amount is less than 10 mol%, the self-emulsifying ability due to neutralization and partial saponification is insufficient, and the dilution stability, storage stability, mechanical stability, etc. are reduced, and even if it exceeds 130 mol%, a stable emulsion is obtained. Although it can be obtained, it may cause problems in odor and persistence, both of which are not preferable.

[0009] The crude emulsion by crude an emulsion phase-inversion method by atomization phase inversion process, a method of wax and a basic substance melt mixing, slowly added to the hot water under stirring it,
Alternatively, it is a step of gradually adding hot water to the molten mixture of the wax and the basic substance while stirring to roughly emulsify the wax. Homogeneous dispersion with a high-speed stirrer (homomixer) The homogenization with a high-speed stirrer is a process in which the crude wax emulsion obtained in the step is homogenized with a high-speed stirrer at a temperature of 80 to 97 ° C. . Usually, it is 2,000-4,000 rpm with a commercially available high-speed stirrer such as a homomixer.
Stir at the rotation speed of and mix until a homogenous dispersion can be visually confirmed. At this time, the rotation speed of the high-speed stirrer was 2,000.
If it is less than rpm, dispersion may be insufficient, and if it is more than 4,000 rpm, entrapment of bubbles may increase.

Atomization by a high-pressure homogenizer A homogenization by a high-pressure homogenizer means that the average particle size of the emulsion obtained in the step is about 20 to 100 μm, and large particles of 300 μm or more are mixed. Therefore, the process is carried out by using a high-pressure homogenizer so that the average particle diameter of the emulsion becomes 2 μm or less. This high-pressure homogenizer is an emulsifying disperser that applies a high pressure to the treatment liquid and injects the treatment liquid from the minute gaps of the valve to produce a homogeneous, fine emulsion that does not easily separate, and is generally a homogenizer. It is known by the name of. Commercially available products of this homogenizer are "HOMOGENIZER" (manufactured by Sanwa Machinery Co., Ltd.) and "Ultra High Pressure Homogenizer; M-110-E / H, M-140K, M-210C-E /"
H, M-610 "(manufactured by Mizuho Industry Co., Ltd.), trade name"Nanomizer; YSNM-1500AR, YSNM-1500-0025N "(manufactured by Yoshida Kikai Kogyo Co., Ltd.) and the like.

The emulsion obtained in the above process has a pressure of a high pressure homogenizer of 100 kg / cm ² or more, preferably 10
By setting 0 to 600 kg / cm ² , the average particle size is 2μ.
m or less, or more preferably 300 to 600 kg / cm
^By setting it to ² , a homogeneous and good emulsion having an average particle size of 2 μm or less and a maximum particle size of 5 μm or less can be obtained. If the pressure of the high-pressure homogenizer is less than 100 kg / cm ² ,
Unable to obtain the expected particle size, 600 kg / cm ²
If it exceeds the above value, it is difficult to further reduce the size of the particles, bubbles are often involved, the viscosity is increased, and the cooling process takes a long time, which is uneconomical. A stable soap-free wax emulsion can be obtained by continuously treating the above steps (1) to (5) and then cooling to room temperature.

Non-Oxidized Wax In the soap-free wax emulsion of the present invention, the non-oxidized wax is mixed in a weight ratio of oxidized wax / non-oxidized wax of 99/1 to 10/90, preferably 99/1 to 15. It can be contained in a ratio of / 85. If the content of the non-oxidizing wax exceeds 90% by weight, emulsification becomes poor, which is not preferable. Nonvolatile content The soap-free wax emulsion of the present invention has a nonvolatile content of 10 to 60% by mass, preferably 20 to 40% by mass. If the concentration of non-volatile components is less than 10%, the dilution stability of the emulsion becomes poor, and if it exceeds 60%, the viscosity tends to increase and the workability tends to deteriorate, such being undesirable. The soap-free wax emulsion of the present invention essentially does not require a surfactant, but its blending is not hindered without departing from the objects and effects of the present invention.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION (Examples 1 to 5) Candelilla wax 30 having an acid value of 20, a saponification value of 50, and a melting point of 66 to 71 ° C.
Part was heated and dissolved at 85 to 95 ° C., then with stirring adding 0.3 to 4.2 parts Morpholine (C ₄ H ₉ ON) This was followed by 70 parts of this 85 to 95 ° C. hot water Was gradually added to carry out phase inversion emulsification. After completion of the phase inversion emulsification, while maintaining the temperature of the obtained coarse emulsion, a homomixer (TK Homomixer, manufactured by Tokushu Kika Co., Ltd.) is used for 2,500 to 3,500 r.
High speed stirring at pm, followed by homogenizer (APV GAULI
N, INC. 15MR-STA) under a high pressure of 380 to 420 kg / cm ² . Then, while stirring, 38 ℃
After cooling, a soap-free wax emulsion having an average particle size of 2 μm or less was obtained.

As shown in Examples 1 to 5 in Table 1 below, an emulsion which can be put to practical use with a morpholine amount of 0.3 part (corresponding to about 10 mol% of the theoretical amount) is further added.
It can be seen that a good emulsion is obtained with 4.2 parts (corresponding to about 30 to 130 mol% of the theoretical amount). The above theoretical amount of morpholine is obtained by the following calculation (calculating 1 equivalent of morpholine as 87 and 1 equivalent of caustic potash as 56). From the formula (1) below, the amount of morpholine required for complete neutralization =
30 × 20 (acid value) × 87 / 56≈932 From the following formula (2), the amount of morpholine required for complete saponification =
30 × 50 (saponification value) × 87 / 56≈2,330 Amount of morpholine required for complete neutralization and saponification = +
= 3,262 mg, that is, the amount of morpholine required for emulsifying 30 parts of the above candelilla wax having an acid value of 20 and a saponification value of 50 is 3.26 parts. Neutralization _{reaction: R-COOH + C 4 H} 9 ON ────> R-COO - [C ₄ H ₁₀ ON] ⁺ (1) saponification _{reaction: R'-COOR "+ C 4} H 9 ON + H 2 O ─ ──> R-COO ^- [C ₄ H ₁₀ ON] ^{+ + R "OH ··· (2} )

(Comparative Examples 1 and 2) 30 parts of non-oxidizing 150 ° F. paraffin wax (manufactured by Nippon Seiro Co., Ltd .: paraffin wax 150) having a melting point of 63 to 69 ° C., or a melting point of 67.
Non-oxidized microcrystalline wax (Hi-Mic-1045 manufactured by Nippon Seiro Co., Ltd.) at ˜73 ° C. is heated and melted to 85 to 95 ° C., and then 5 parts of morpholine is added and mixed, followed by stirring. Meanwhile, 70 parts of hot water at 85 to 95 ° C was gradually added. The state of emulsions of Examples 1 to 5 and Comparative Examples 1 and 2 and the state of emulsions diluted 2 to 10 times thereof are shown in Table 1 below.

[0016]

[Table 1] Note 1: Visually observe the transparency of emulsion / presence / absence of particles / separation / viscosity. Note-2: Dilute emulsion / water = 1/1 and visually observe the above condition. Note-3: Dilute emulsion / water = 1/4 and visually observe the above condition. Note-4: Dilute emulsion / water = 1/9 and visually observe the above condition. <Evaluation of state> ○: Good (no precipitation of particles, no change in appearance such as separation, thickening, etc.) Δ: Somewhat bad (precipitation of some particles, slight separation, thickening, etc.) X: Poor (poor emulsification, precipitation of particles, and significant increase in separation and viscosity.) In the above <evaluation of state>, Δ is an emulsion that can be put to practical use, and Table 2 below. ○, △, × in 4
Also has the same meaning as in <Evaluation of State> above.

Examples 6 to 11 Acid value 20, Saponification value 5
0, 30 parts of candelilla wax having a melting point of 66 to 71 ° C. is melted by heating at 85 to 95 ° C., and then 3.0 parts of morpholine (C ₄ H ₉ ON) is added thereto and stirred, and then 85 parts thereof is added. 70 parts of hot water at ˜95 ° C. was gradually added to carry out phase inversion emulsification. After completion of phase inversion emulsification, homogenizer (made by Tokushu Kika Co., Ltd .: TK
High speed stirring at 3,000 rpm with a homogenizer), followed by 10 with a homogenizer (APV GAULIN, INC. 15MR-STA).
The treatment was performed at a high pressure of 0 to 600 kg / cm ² . Then, the mixture was cooled to 38 ° C. with stirring to obtain a soap-free wax emulsion having an average particle size of 2 μm or less.

(Comparative Example 3) A homomixer (TK homomixer manufactured by Tokushu Kika Co., Ltd.) was used for the above crude emulsion.
Then, only the process of high-speed stirring at 3,000 rpm was performed.
Then, it cooled to 38 degreeC, stirring. The emulsion states of Examples 6 to 11 and Comparative Example 3 are shown in Table 2 below.
Is shown in.

[0019]

[Table 2]

(Example 12) An acid value of 20 and a saponification value of 50
3 parts Handelilla wax and 135 ° F paraffin wax
After heating and melting 27 parts of the wax to 80 to 90 ° C,
Add 1.0 part of ruphorin and stir it while stirring.
70 parts of hot water at 80 to 90 ° C is gradually added to carry out phase inversion emulsification.
went. After completion of phase inversion emulsification, keep the resulting crude emulsion warm.
Rotating speed of hara homo mixer at 3,000 rpm, homo
The pressure of the generator is 400kg / cm ²Process as
It was. Then, it is cooled to 38 ° C. and the average particle size is 2 μm.
A soap-free wax emulsion having a size of m or less was obtained. (Example 13) In Example 12, acid value 20, saponification value
5 parts of 50 candelilla wax, 135 ° F paraf
Same as Example 12 except that the amount of in wax is 25 parts.
And a soap-free wad with an average particle size of 2 μm or less
A cous emulsion was obtained. (Example 14) In Example 12, acid value 20, saponification value
10 parts of 50 candelilla wax, 135 ° F para
Same as Example 12 except that fin wax is 20 parts.
Similarly, the average particle size is 1 μm or less, and the maximum particle size is 5 μm.
A soap-free wax emulsion having a size of m or less was obtained.

(Comparative Example 4) 30 parts of 135 ° F paraffin wax was heated and dissolved to 80 to 90 ° C, and then 3.2 parts of sorbitan monostearate (surfactant manufactured by Kao Corporation: Leodol SP-S10). , Polyoxyethyl sorbitan monostearate (Kao Co., Ltd. surfactant: Leodol TW-S120) 4.8 parts and polyoxyethylene lauryl ether (Kao Co., Ltd. surfactant: Emulgen 12
0) 2.0 parts were added. 85 while stirring
70 parts of hot water at ˜95 ° C. was gradually added to carry out phase inversion emulsification. Then, it cooled to 38 degreeC. The states of the emulsions of Examples 12 to 14 and Comparative Example 4 and the state of the emulsion after the alcohol miscibility test are shown in Table 3 below.

[0022]

[Table 3] <Note-5: Alcohol miscibility test> Isopropyl alcohol adjusted to a concentration of 50% is mixed with the emulsion in a weight ratio of 1/1, and the state after standing overnight is observed.

(Examples 15 to 24) In Example 1,
Natural waxes (candelilla wax, carnauba wax, rice wax, beeswax) as oxidation wax
5 types, maleic acid modified polymer (Mitsubishi Kasei Co., Ltd.)
Manufactured: Diakarna 30), one or more selected from montan modified wax (Hoechst wax E), and the above theoretical amount of morpholine necessary for complete neutralization and saponification of the oxidized wax. Similar to Example 1, the average particle size is 1 μm or less, and the maximum particle size is 5 μm.
The following soap-free wax emulsion was obtained. However, the amount of wax used is 30 parts in the case of one kind, 15 parts / 15 parts in the case of two kinds, and 10 parts / 10 parts / in the case of three kinds.
It is 10 copies. The results of the emulsion state of Examples 15 to 24, the emulsion state of 2 to 10-fold dilution thereof, storage stability (state after 1 month at 50 ° C.) and alcohol miscibility are shown in Table 4 below. . In Table 4, + indicates use, and-indicates non-use.

[0024]

[Table 4] Note-6 Storage stability: Changes in state after 1 month at 50 ° C were observed. Note-7 It has the same meaning as in <Note-5: Alcohol miscibility test> above.

[0025]

As described above, the emulsion produced by the present invention has an average particle size of 2 μm or less, preferably an average particle size of 2 μm or less and a maximum particle size of 5 μm.
It is a soap-free wax emulsion of m or less,
It has excellent dilution stability, storage stability, alcohol miscibility, mechanical stability (emulsion is not destroyed by mechanical force such as spraying), water repellency, blocking resistance, and it does not use a surfactant, so it is an environmental hormone. It has no environmental problems and is environmentally friendly. In addition, a stable soap-free wax emulsion can be obtained even when 1 to 90% of other non-oxidizing wax is mixed, so that the performance of the other non-oxidizing wax can be extracted and utilized. It is possible to expand the application range of emulsions. On the other hand, the conventional wax emulsion, even if the emulsion itself is in good condition,
By using a surfactant, the performance of wax such as water repellency and blocking resistance is deteriorated, and the problem of environmental hormones is caused.

[0026]

[Brief description of drawings]

FIG. 1 is a diagram illustrating a change in average particle diameter of wax due to a change in pressure applied by a homogenizer.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09K 3/18 101 C09K 3/18 101 F term (reference) 4F070 AA13 AA15 AA63 AC19 AC45 AC46 AE14 CA05 CB02 CB05 4H020 BA07 4J002 BB251 DF006 EN026 EU236 HA07

Claims (9)

[Claims] 1. A composition containing (a) an oxidized wax and (b) a basic substance as essential components is first coarsely emulsified by a phase inversion method, and then a high-speed stirrer (homomixer).
The method for producing a soap-free wax emulsion is characterized by homogenizing with a high-pressure homogenizer (homogenizer) of 100 kg / cm ² or more. 2. The blending amount of the basic substance is 10 to the theoretical amount calculated from the acid value and saponification value of the oxidized wax.
It is 130 mol%, The manufacturing method of the soap free type | mold wax emulsion of Claim 1 characterized by the above-mentioned. 3. The acid value of the oxidized wax is 5 to 15
The method for producing a soap-free wax emulsion according to claim 1 or 2, wherein the wax is an oxidized wax having a saponification value of 50 to 250. 4. The method according to claim 1, wherein the basic substance is a volatile organic amine and / or ammonia.
4. The method for producing a soap-free wax emulsion according to any one of 3 above. 5. The volatile organic amine is morpholine,
1 selected from alkylamine and alkanolamine
5. The method for producing a soap-free wax emulsion according to any one of 1 to 4, which is a compound of two or more kinds. 6. The rotation speed of the high speed stirrer is 2,000.
It is 0-4,000 rpm, It is characterized by the above-mentioned.
6. The method for producing a soap-free wax emulsion according to any one of 5 to 5. 7. The pressure of the high-pressure homogenizer is 100 to 60.
It is 0 kg / cm < ² >, The manufacturing method of the soap free type | mold wax emulsion in any one of Claims 1-6 characterized by the above-mentioned. 8. The composition comprises a non-oxidizing wax and a weight ratio of the oxidizing wax / non-oxidizing wax of 99/1 to 1.
The method for producing a soap-free wax emulsion according to any one of claims 1 to 7, characterized in that the content is 0/90. 9. The composition has a nonvolatile concentration of 10 to 6
It is 0 mass%, The manufacturing method of the soap free type | mold wax emulsion in any one of Claims 1-8 characterized by the above-mentioned.