JPS5925839B2 - Manufacturing method of solid detergent - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a solid detergent for face washing.

Specifically, the present invention relates to a method of incorporating zinc oxide into the solid detergent described above. Zinc oxide is known as an ingredient of the solid detergents as an opacifying agent.

The present invention proposes a method of mixing zinc oxide into a solid detergent in the form of a slurry in a mixing step. The invention is particularly applicable to solid detergents containing free fatty acids. When incorporating zinc oxide into a detergent bar containing long-chain free fatty acids (C8-C22), the detergent bar will be free from sand during use, unless the special processing steps of the present invention are used in the manufacture of the detergent bar. It was found that a mixed feeling was observed. The problem arises when the detergent bar contains at least about 1% by weight free fatty acids, but the normal maximum weight of fatty acids in detergent bars is up to about 15% by weight of soap bar, or less. or more, that is, up to 25% by weight. Non-soap bar detergents containing about 20% free stearic acid are also produced commercially. The detergent active agent may be any of those proposed for use in solid detergents, such as C8 to C22 fatty acid alkali metal salts, C8 to C22 alkane sulfonates, oleic, sulfonate, alkylaryl, sulfone. acid salts, isethionate salts and mixtures thereof (other curative agents are
Interscience in 2018
Schwartz, published by
2) and Perry's "Surface"
Active Agents, Volume 1 and Schwartz, P., and Birch, Volume 1, published by Interscience, Inc., 1958). The present invention is a method for producing a solid detergent containing zinc oxide, and the method includes: I) slurrying zinc oxide in a liquid medium, and ■) adding the slurry and mixing it with detergent raw materials in a mixing step. , and) characterized in that the detergent is machine kneaded, extruded, and stamped to form a solid detergent.

The zinc oxide used in the present invention preferably has a particle size distribution such that no more than about 5% by weight is retained on a 10 micron sieve and no more than about 3% by weight is retained on a 30 micron sieve; is formed into a slurry by the liquid medium. The amount of zinc oxide in the detergent bar will normally be in the range of about 0.1% to about 2% by weight, and the detergent ingredients are mechanically mixed as quickly as possible after the slurry is added in the mixing step. It is preferable that the mechanical kneading step starts from the mixing step.
Preferably, this is done within 5 minutes.

It is ensured during a short period of time prior to mechanical mixing that a sandy feel is not present in the molded detergent bars and does not develop during use. Also, mixing must be done as soon as possible. Generally, larger batches of free fatty acid detergents take longer to mix, which usually results in a sandy feel to the bar soap. Particle size analysis was performed by dispersing zinc oxide (17) in a 2% W/W soap solution (50 ml).

The paper used was BMC micromesh. The usual range of free fatty acids was 5% to 10%, and the preferred amount of zinc oxide was 0.3 to 1.2%.

Slurry viscosities of 200 poise or higher can be used, but these may be the limit when using standard manufacturing and handling techniques.

The viscosity will preferably be 25 poise or less. Preferably, the slurry contains about 10% to about 80% by weight zinc oxide, more preferably about 20% to about 70%. The liquid medium can be based on either water or organic liquids. Mixtures of these liquids can also be used, so short chain alcohols may be used in combination with water. The organic liquids listed below can also be used in admixture with each other or with water. The aqueous medium requires a surfactant to stabilize the slurry, preferably from about 0.1% to about 5% by weight. Stabilizers may also be required for organic liquid slurries. Organic liquids that can be used include fragrances, which are aromatic liquids normally used in small quantities in the manufacture of solid detergents, long chain alcohols such as Cl3 to Cl5, and liquid polyethylene glycols of low molecular weight so that the slurry has the desired viscosity. dimethyl lauramide, methyl taro monofatty acid, nonyl phenols ethoxylated to an average of 9 units, ethoxylated alcohols, e.g. C,2-Cl4 with 12 to 14 ethoxylations
Side chain alcohols, ethyl hexane diol, glycerol trioleate, glycerol, phenoxy ethanolamide and ethoxylated amides, such as coco diethanolamide with an average of 25 units of ethoxylation. Some of these organic liquids have desirable advantages in solid detergents. The organic liquid may be either miscible or immiscible with water; in the latter case it may be necessary to ensure that the amount used does not interfere with foaming power or other user properties. The temperature of the detergent mass to which the slurry is added is preferably lower than 40°C, as the solid detergent may feel like sand is mixed in during use. show.

The zinc oxide used in the following examples was manufactured by Altrincham, UK and Dalham, London.
Durham) raw material company, 0.25
It had a nominal (average) particle size of microns. Example
1 50V of zinc oxide (pharmaceutical grade) was dispersed in 100ml of 1% Taro one soap solution using a SilversOn mixer.

The zinc oxide powder satisfied the above particle size distribution. The soap contained free fatty acids and had a composition of 75 parts sodium taromonoate, 25 parts sodium coconut oil fatty acid, and 6 parts sodium coconut oil fatty acid. Soap (1.94
6y) was placed in a mixer and 597 zinc oxide slurry was added. The free fatty acids must be thoroughly and evenly mixed in the soap before adding the slurry. Also during this mixing step, other ingredients such as pigments (e.g. titanium dioxide) may be added.
, fragrances, dyes and fluorescent agents could also be added. The soap is mixed until the ingredients are thoroughly mixed, then machined, extruded, and stamped to form a detergent bar for facial cleansing. This solid detergent had a smooth feel during use.
EXAMPLE A fat-rich solid detergent was prepared having the following formulation.

1.8 kg of zinc oxide (pharmaceutical grade) was added to a 4% aqueous solution of dodecyl benzene sodium sulfonate (0.00 kg).
77k9 and the whole was blended in a Silverson mixer for 10
A slurry was made by mixing for a minute.

0.65 kg of the slurry along with perfume and color were then added to the fat-rich soap 50k9, mixed and machine milled at a rate of 1/hr/ton. The machined soap was extruded, cut into billets, and stamped. This soap is
It was smooth when manufactured and remained smooth during use. EXAMPLE Example 1 was repeated using a 0.5% w/w solution of NOnidet P8O (ethoxylated octyl phenol available from Shell) in place of the slurry described above.

EXAMPLE New Herbalf Ougere perfume was mixed with 0.7 parts of powdered zinc oxide by hand stirring in a stainless steel container.

This mixture was then passed through a colloid mill set in a 0.0025 inch gap to produce a thick stable cream. 1.6 parts of zinc oxide cream was added to 98.34 parts of overfat soap noodles along with 0.56 parts of colorant slurry in a ribbon mixer and then mixed for 4 minutes.

The resulting mixture was passed through a three-roll soap mill and then purified before extrusion under reduced pressure. The extruded detergent bars were cut and stamped into detergent bars in the usual manner. When used in cold and hot water, the bar soap was judged to have good properties with a satisfyingly smooth feel for facial cleansing. Example V The example was repeated using the following formulation (parts by weight) as perfume.

The resulting solid detergent had acceptable properties for facial cleansing with a satisfactory smooth feel.

The invention is a method as claimed, but includes the following embodiments. (1) Zinc oxide, with less than about 5% by weight of the oxide being retained on a 10 micron sieve;
The method of claim 1, wherein less than or equal to about 3% by weight has a particle size distribution such that less than or equal to about 3% by weight is retained on a 30 micron sieve.

(2) The method according to claim or paragraph (1), characterized in that the liquid medium is aqueous.

(3) Item (2) above, wherein the medium contains an effective amount of a surfactant to stabilize the slurry.
The method described in section. (4) The method of paragraph (3), wherein the surfactant is present in an amount of about 0.1% to about 5% based on the weight of the slurry.

(5) The method according to claim or item (1), wherein the liquid medium is an organic substance.

(6) The method according to item (5) above, wherein the organic liquid is a fragrance. 7. A method according to claim 1 or any preceding claim, characterized in that the detergent raw material contains at least about 1% by weight of free fatty acids containing from 8 to 22 carbon atoms.

(8) The method of paragraph (7), wherein the detergent raw material contains up to about 25% by weight of free fatty acids.

(9) A method according to paragraph (8), characterized in that the detergent raw material contains up to about 15% by weight of free fatty acids.

(sub) The amount of zinc oxide added is about 0.0% of the final bar soap.
A method according to any of the preceding claims, characterized in that the amount is from 1% to about 2% by weight.

G1) Process according to claims or any of the preceding paragraphs, characterized in that the step of mechanical kneading is carried out within 15 minutes of the completion of the mixing step.

A method as claimed in claim or any preceding claim, characterized in that the OZ slurry has a viscosity of no more than about 200 poise.

(auto) The method according to item ◎ above, characterized in that the slurry has a viscosity not greater than 25 poise.

A method as claimed in any of the preceding claims, characterized in that the slurry contains about 10% (by weight) of zinc oxide (about 80%).

The method of item A4), wherein the slurry contains about 20% to about 70% zinc oxide.

Claims (1)

[Claims] 1. In a method for producing a solid detergent containing zinc oxide and free fatty acids, (I) slurrying zinc oxide in a liquid medium, and (II) adding the slurry to a detergent raw material containing free fatty acids in a mixing step. mix, and (III)
A method characterized in that the detergent raw material is mechanically kneaded, extruded and stamped to form a solid detergent.