CN109172402B - Homogeneous liquid composition with fatty acid monoethanolamide as main component and preparation method thereof - Google Patents

Abstract

A homogeneous phase liquid composition with fatty acid monoethanolamide as a main component and a preparation method thereof are disclosed, wherein the composition comprises the following components in percentage by mass: 30-52% of fatty acid monoethanolamide, 28-50% of water, 4-10% of acetic acid monoethanolamide, 0.1-0.5% of oligopeptide and 4-10% of oil-water miscible growth promoter; adding fatty acid monoethanolamide and oligopeptide into aqueous solution of acetic acid monoethanolamide and oil-water miscible growth promoter, and stirring to dissolve completely to obtain homogeneous liquid composition containing fatty acid monoethanolamide as main component. The composition is still in a homogeneous fluid state at 0 ℃ or 25 ℃. The composition has low cost and good thickening and foam stabilizing performance, is suitable for the formula of cosmetics or washing and caring products, and has industrial value.

Description

Homogeneous liquid composition with fatty acid monoethanolamide as main component and preparation method thereof

Technical Field

The invention relates to the technical field of functional raw materials of cosmetics, in particular to a homogeneous liquid composition taking fatty acid monoethanolamide as a main component and a preparation method thereof.

Background

Since Wolf developed fatty acid diethanolamide nonionic surfactant in 1937, the surfactant is widely applied due to excellent thickening and foam stabilizing properties, the product is called Ninol at abroad, and the surfactant at home is 6501 due to the first important surfactant developed in 1965 to break international monopoly. The research results at home and abroad in recent years show that the daily chemicals taking fatty acid diethanolamide series surfactants containing a small amount of free diethanolamine as main formula raw materials have potential carcinogenicity, and the main reason is that the free diethanolamine is easy to generate carcinogenic nitrosamine compounds in the synthesis process, the product storage process or the product use process. Therefore, fatty acid diethanolamide with excellent performance and good fluidity is forbidden to be used in resident or semi-resident cosmetic formulations in major developed countries such as Europe and America, and although the use of the fatty acid diethanolamide is not strictly forbidden in China, major cosmetic and washing product manufacturers do not use the fatty acid diethanolamide as a thickening and foam stabilizing aid any more.

For 30 years, the development and application of safer fatty acid monoethanolamide to replace potentially carcinogenic fatty acid diethanolamide products have been focused at home and abroad. A large number of research results show that the fatty acid monoethanolamide has the characteristics of thickening, antistatic, softening, foam increasing, foam stabilizing, decontamination, reduction of irritation of anionic surfactants in detergents, remarkable improvement of comprehensive washing capacity of products and the like which are the same as those of the fatty acid diethanolamide, can be applied to almost all original formulas containing the fatty acid diethanolamide, and in addition, the fatty acid monoethanolamide has no concern about carcinogenicity, so that the application range of the fatty acid monoethanolamide is wider. However, from the market analysis, the actual market application amount of the fatty acid monoethanolamide product which is cheap, excellent in performance and safe in application is not as the analysis of the above-mentioned "trade-off". Although the dosage of the fatty acid monoethanolamide is increased due to the combined influence on the safety of the product, the product performance and the cost performance of the product, the dosage of the fatty acid monoethanolamide is far less than the forbidden dosage of the fatty acid diethanolamide. The reasons for hindering the rapid growth of fatty acid monoethanolamide products are two main reasons: (1) the product is sold in a block or slice form, which is not beneficial to material transmission in the formula process and is not suitable for pumping transmission; (2) the product has poor water solubility, and even the dissolution speed of the product is slow with the assistance of other surfactants, so that the formula is not uniform, and the product is not beneficial to a rapid formula system and a low-temperature formula system.

To reduce the effects of the two major drawbacks of fatty acid monoethanolamides described above, some companies have increased the fluidity and rate of dispersion or dissolution in water by increasing the glycerol content of the system. Congis adds 11% by mass of glycerin into a coconut monoethanolamide product to enable the product to have certain fluidity at 65 ℃, but the application of the product in formulas of daily chemical products, medicines and the like is influenced by deepening of color caused by long-time storage of the product at 65 ℃. The company then continues to increase the glycerol content and the water content on the basis of the mixture, obtaining a coconut monoethanolamide product which still has a certain fluidity at 50 ℃, slowing down the darkening of the product due to excessive temperatures; however, when the temperature is further lowered, the product becomes cloudy until a viscous paste is formed, and an unstable state such as delamination occurs even when the product is left at room temperature for a long time. The coconut monoethanolamide product can show fluidity at higher temperature (more than or equal to 50 ℃), and the essence of the product is that glycerin or a high-concentration glycerin aqueous solution in a system influences the crystallinity of the coconut monoethanolamide to show melting point reduction behavior, but a method for promoting the melting point reduction by adding glycerin is not enough to reduce the temperature of the system, which can stably flow, to room temperature or lower, and in addition, the instability of the coconut monoethanolamide added with the glycerin or the high-concentration glycerin solution at room temperature also influences the popularization and application of the product. From this, it is known that there is a strong demand in the market for long-chain fatty acid monoethanolamide products that are homogeneous at room temperature or low temperature.

The invention discloses a mixed hydrotropic system suitable for dissolving fatty acid monoethanolamide in water, and aims to prepare a room-temperature or low-temperature homogeneous liquid composition taking fatty acid monoethanolamide as a main component.

Disclosure of Invention

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a homogeneous liquid composition containing fatty acid monoethanolamide as a main component, which is a mixed hydrotropic system suitable for dissolving fatty acid monoethanolamide in water, and a room-temperature or low-temperature homogeneous liquid composition containing fatty acid monoethanolamide as a main component, which is more practical and has industrial utility.

The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme.

A homogeneous phase liquid composition with fatty acid monoethanolamide as a main component comprises the following components in percentage by mass: 30-52% of fatty acid monoethanolamide, 28-50% of water, 4-10% of acetic acid monoethanolamide, 0.1-0.5% of oligopeptide and 4-10% of oil-water miscible growth substance.

In a preferred embodiment, the fatty acid monoethanolamide is one or more of lauric acid monoethanolamide, palmitic acid monoethanolamide, stearic acid monoethanolamide, coconut acid monoethanolamide, palm kernel oleic acid monoethanolamide, soybean oleic acid monoethanolamide, and rapeseed oleic acid monoethanolamide.

As a preferable technical scheme, the mass percentage of the fatty acid monoethanolamide is 47-52%.

As a preferable technical scheme, the mass percentage of the water is 34-44%.

As a preferable technical scheme, the mass percentage of the acetic monoethanolamide is preferably 5% -8%.

As a preferable technical scheme, the oligopeptide is any one of corn oligopeptide and soybean oligopeptide or a mixture of two of the corn oligopeptide and the soybean oligopeptide.

As a preferable technical scheme, the mass percentage of the oligopeptide is 0.1% -0.2%.

In a preferred embodiment, the oil-water miscible growth promoter is one or a mixture of more than one of glycerol, propylene glycol, ethylene glycol and polyethylene glycol.

As a preferable technical scheme, the oil-water miscible growth substance is 4-6% by mass.

The preparation method of the homogeneous phase liquid composition taking fatty acid monoethanolamide as a main component comprises the following steps:

step 1, weighing the components according to the weight percentage;

step 2, adding the acetic acid monoethanolamide and the oil-water miscible growth substance weighed in the step 1 into the water, stirring uniformly, and heating to 60 ℃ to obtain an aqueous solution;

and 3, adding the fatty acid monoethanolamide and the oligopeptide into the aqueous solution obtained in the step 2, and continuously stirring until the fatty acid monoethanolamide and the oligopeptide are completely dissolved.

By adopting the technical scheme, the following technical beneficial effects can be realized:

(1) the homogeneous-phase liquid composition taking the fatty acid monoethanolamide as the main component is compounded with 28-50% of water, the content of the fatty acid monoethanolamide is only 30-52%, and a small amount of acetic acid monoethanolamide and oligopeptide are added to promote the formation of vermicular mixed micelles, so that the thickening property of the composition is better than that of the fatty acid monoethanolamide;

(2) the homogeneous-phase liquid composition taking the fatty acid monoethanolamide as the main component is homogeneous-phase transparent liquid at room temperature, has good fluidity, can provide power through a pump or provide power for pipeline transmission through an elevated tank, and solves the problem that the mass transmission is difficult when the blocky or sliced fatty acid monoethanolamide is used in the formula production process;

(3) the composition provided by the invention has higher dispersion speed in water or in the preparation process of the formula, solves the problems of poor water solubility of blocky or sliced fatty acid monoethanolamide and low dissolution speed in the preparation process of the formula, and solves the problem that the fatty acid monoethanolamide only contains glycerol or aqueous solution of the glycerol is not suitable for a cold preparation process;

(4) the composition provided by the invention is a homogeneous solution at room temperature, and is free from unstable phenomena such as layering and the like caused by long-time placement;

(5) the composition taking lauric acid monoethanolamide, coconut oil acid monoethanolamide or palm kernel oleic acid monoethanolamide as main components provided by the invention is a uniform and transparent solution after the temperature is reduced to 0 ℃, and has good low-temperature stability;

(6) the composition taking palmitic acid monoethanolamide, stearic acid monoethanolamide, soybean oleic acid monoethanolamide or rapeseed oleic acid monoethanolamide as main components is a uniform and transparent solution at 25 ℃, so that the fluidization problem of high-carbon-chain fatty acid monoethanolamide is solved; when the temperature is reduced to 0 ℃, the composition is in a sticky and opaque paste shape, the paste is heated to 25 ℃ again and then is quickly recovered to be a clear and transparent solution, and the problem that the monoethanolamide containing high-carbon-chain fatty acid is not easy to fluidize or the fluid state is unstable is solved;

(7) all the components of the oil-water miscible growth substance and the fatty acid monoethanolamide in the invention are safe components recorded in the name list of the used cosmetic raw materials, so that the composition is suitable for all cosmetic and washing and care product formulas.

Description of the drawings:

FIG. 1 is a Cole-Cole curve at 25 ℃ for the product of example 3.

FIG. 2 is a Cole-Cole curve of the product of example 3 at 20 ℃.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the embodiments, features and effects of the homogeneous liquid composition based on fatty acid monoethanolamide and the preparation method thereof according to the present invention will be described in detail below.

The invention discloses a homogeneous liquid composition taking fatty acid monoethanolamide as a main component, which comprises the following components in percentage by mass: 30-52% of fatty acid monoethanolamide, 28-50% of water, 4-10% of acetic acid monoethanolamide, 0.1-0.5% of oligopeptide and 4-10% of oil-water miscible growth promoter.

Preferably, the fatty acid monoethanolamide is one or more of lauric acid monoethanolamide, palmitic acid monoethanolamide, stearic acid monoethanolamide, coconut oil acid monoethanolamide, palm kernel oleic acid monoethanolamide, soybean oleic acid monoethanolamide, and rapeseed oleic acid monoethanolamide.

As a preferred technical scheme, the mass percentage of the fatty acid monoethanolamide is 47-52%.

As a preferred technical scheme, the mass percentage of the water is 34-44%.

As a preferred technical scheme, the mass percentage of the acetic acid monoethanolamide is preferably 5% -8%.

As a preferred technical scheme, the oligopeptide is any one of corn oligopeptide and soybean oligopeptide or a mixture of the two.

As a preferred technical scheme, the mass percentage of the oligopeptide is 0.1% -0.2%.

As a preferable technical scheme, the oil-water miscible growth substance is any one or a mixture of more than one of glycerol, propylene glycol, ethylene glycol and polyethylene glycol.

As an optimal technical scheme, the oil-water miscible growth substance is 4-6% by mass.

The preparation method of the homogeneous phase liquid composition taking fatty acid monoethanolamide as a main component comprises the following steps:

step 1, weighing the components according to the weight percentage;

step 2, adding the acetic acid monoethanolamide and the oil-water miscible growth substance weighed in the step 1 into water, stirring uniformly, and heating to 60 ℃ to obtain an aqueous solution;

and 3, adding the fatty acid monoethanolamide and the oligopeptide into the aqueous solution obtained in the step 2, and continuously stirring until the fatty acid monoethanolamide and the oligopeptide are completely dissolved.

In order to further illustrate the present invention, the following examples are provided to describe the homogeneous liquid composition containing fatty acid monoethanolamide as the main component and the preparation method thereof in detail, but should not be construed as limiting the scope of the present invention.

Example 1

The lauric acid monoethanolamide content is 48 wt%, the water content is 39 wt%, the acetic acid monoethanolamide content is 8.0wt%, the glycerol content is 4.5wt%, the propylene glycol content is 0.2wt%, the ethylene glycol content is 0.2wt%, and the corn oligopeptide content is 0.1wt%, and the mixture is in a fluid state at 0 ℃, is not layered in a homogeneous phase, and is clear and transparent.

Example 2

The coconut monoethanolamide content is 49 wt%, the water content is 38.5 wt%, the acetic monoethanolamide content is 7.3 wt%, the glycerol content is 4.7 wt%, the 1, 3-propylene glycol content is 0.2wt%, the polyethylene glycol content is 0.1wt%, and the corn oligopeptide content is 0.2%, and the mixture is in a fluid state at 0 ℃, is not layered in a homogeneous phase, and is clear and transparent.

Example 3

The stearic acid monoethanolamide content is 50 wt%, the water content is 40wt%, the acetic acid monoethanolamide content is 5wt%, the glycerol content is 4.5wt%, the ethylene glycol content is 0.3 wt%, and the corn oligopeptide content is 0.2%. Referring to FIG. 1, the variation of the viscous modulus of the product with the elastic modulus relatively conforms to a semicircle in the low and middle frequency regions and partially deviates from the semicircle in the high frequency region, which is consistent with the rheological characteristics of the surfactant forming worm-like micelles, indicating that the product of example 3 has worm-like micelle characteristics at 25 ℃; referring to FIG. 2, the variation of the viscous modulus of the product with the elastic modulus relatively conforms to a semicircle in the low and middle frequency regions and partially deviates from the semicircle in the high frequency region, which is consistent with the rheological characteristics of the surfactant forming worm-like micelles, indicating that the product of example 3 still has worm-like micelle characteristics at 20 ℃.

Example 4

The mixture is in a fluid state at the normal temperature of 25 ℃, is not layered in homogeneous phase, and is clear and transparent.

Example 5

The coconut monoethanolamide content is 48.5wt%, the water content is 40wt%, the acetic monoethanolamide content is 6.5 wt%, the glycerin content is 4.3wt%, the propylene glycol content is 0.3 wt%, the ethylene glycol content is 0.2wt%, the corn oligopeptide content is 0.1%, and the soybean oligopeptide content is 0.1%.

Example 6

The palm kernel oleic acid monoethanolamide content is 48 wt%, the water content is 42 wt%, the acetic acid monoethanolamide content is 6wt%, the glycerol content is 3.5wt%, the polyethylene glycol content is 0.3 wt%, and the corn oligopeptide content is 0.2%.

Example 7

The content of palmitic acid monoethanolamide is 46 wt%, the content of water is 44 wt%, the content of acetic acid monoethanolamide is 4.8wt%, the content of glycerol is 4wt%, the content of polyethylene glycol is 1wt%, and the content of corn oligopeptide is 0.2%.

Example 8

The coconut monoethanolamide content is 44 wt%, the water content is 37 wt%, the acetic monoethanolamide content is 10wt%, the propylene glycol content is 8.6wt%, and the soybean oligopeptide content is 0.4%, and the mixture is in a fluid state at 0 ℃, is not layered in a homogeneous phase, and is clear and transparent.

Example 9

The lauric acid monoethanolamide content is 43.5 wt%, the water content is 36wt%, the acetic acid monoethanolamide content is 10wt%, the glycerol content is 1wt%, the propylene glycol content is 9wt%, and the soybean oligopeptide content is 0.5%, and the mixture is in a fluid state at 0 ℃, is not layered in homogeneous phase, and is clear and transparent.

Example 10

The lauric acid monoethanolamide content is 40wt%, the palmitic acid monoethanolamide content is 1wt%, the soybean oleic acid monoethanolamide content is 1wt%, the rapeseed oleic acid monoethanolamide content is 1wt%, the water content is 39 wt%, the acetic acid monoethanolamide content is 8wt%, the propylene glycol content is 9.8wt%, and the corn oligopeptide content is 0.2%.

Example 11

The lauric acid monoethanolamide content is 40wt%, the stearic acid monoethanolamide content is 3wt%, the palmitic acid monoethanolamide content is 2wt%, the soybean oleic acid monoethanolamide content is 1wt%, the rapeseed oleic acid monoethanolamide content is 1wt%, the water content is 40wt%, the acetic acid monoethanolamide content is 6wt%, the glycerol content is 6.9wt%, and the corn oligopeptide content is 0.1%.

Example 12

The coconut monoethanolamide content is 50 wt%, the water content is 40wt%, the acetic monoethanolamide content is 4wt%, the glycerol content is 5.8wt%, the corn oligopeptide content is 0.1%, and the soybean oligopeptide content is 0.1%.

Example 13

The lauric acid monoethanolamide content is 20wt%, the coconut oil acid monoethanolamide content is 20wt%, the stearic acid monoethanolamide content is 4wt%, the soybean oil acid monoethanolamide content is 3wt%, the water content is 41 wt%, the acetic acid monoethanolamide content is 7wt%, the glycerin content is 4.8wt%, and the corn oligopeptide content is 0.2%.

Example 14

The lauric acid monoethanolamide content is 24wt%, the stearic acid monoethanolamide content is 24wt%, the water content is 40wt%, the acetic acid monoethanolamide content is 6wt%, the glycerin content is 5.5wt%, the ethylene glycol content is 0.3 wt%, the corn oligopeptide content is 0.1%, and the soybean oligopeptide content is 0.1%.

Example 15

The stearic acid monoethanolamide content is 48 wt%, the water content is 39 wt%, the acetic acid monoethanolamide content is 6wt%, the glycerin content is 6.8wt%, and the corn oligopeptide content is 0.2%.

Example 16

The palm kernel oleic acid monoethanolamide content is 52 wt%, the water content is 37 wt%, the acetic acid monoethanolamide content is 5wt%, the glycerol content is 5.9wt%, and the corn oligopeptide content is 0.1%, and the mixture is in a fluid state at 0 ℃, is not layered in homogeneous phase, and is clear and transparent.

Example 17

The coconut monoethanolamide content is 25 wt%, the palm kernel oleic monoethanolamide content is 26 wt%, the water content is 38 wt%, the acetic monoethanolamide content is 6wt%, the glycerol content is 4.5wt%, the propylene glycol content is 0.2wt%, the ethylene glycol content is 0.2wt%, and the corn oligopeptide content is 0.1%.

Example 18

The content of palmitic acid monoethanolamide is 52 wt%, the content of water is 28 wt%, the content of acetic acid monoethanolamide is 9.9 wt%, the content of glycerol is 9.5wt%, the content of ethylene glycol is 0.5 wt%, and the content of corn oligopeptide is 0.1%.

Example 19

The lauric acid monoethanolamide content is 40wt%, the water content is 48 wt%, the acetic acid monoethanolamide content is 8wt%, the glycerol content is 3.9%, and the corn oligopeptide content is 0.1%, and the mixture is in a fluid state at 0 ℃, is not layered in homogeneous phase, and is clear and transparent.

Example 20

The coconut monoethanolamide content is 36wt%, the water content is 50 wt%, the acetic monoethanolamide content is 9wt%, the glycerol content is 4.9wt%, and the corn oligopeptide content is 0.1%, and the mixture is in a fluid state at 0 ℃, is not layered in homogeneous phase, and is clear and transparent.

Example 21

The palm kernel oleic acid monoethanolamide content is 34.9 wt%, the water content is 50 wt%, the acetic acid monoethanolamide content is 5wt%, the glycerol content is 10wt%, and the soybean oligopeptide content is 0.1%, and the mixture is in a fluid state at 0 ℃, is not layered in homogeneous phase, and is clear and transparent.

The homogeneous liquid phase composition obtained from the above embodiment is in a fluid state at 0-25 ℃, is homogeneous, non-layered, clear and transparent, and can be applied to a rapid formula and a low-temperature formula, and in addition, the viscosity of the composition at 25 ℃ is higher, so that a better effect can be achieved compared with the existing thickening agent.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A homogeneous phase liquid composition taking fatty acid monoethanolamide as a main component is characterized by comprising the following components in percentage by mass: 30-52% of fatty acid monoethanolamide, 28-50% of water, 4-10% of acetic acid monoethanolamide, 0.1-0.5% of oligopeptide and 4-10% of oil-water miscible growth substance.

2. The homogeneous liquid composition comprising a fatty acid monoethanolamide as a main component according to claim 1, wherein the fatty acid monoethanolamide is one or more selected from lauric acid monoethanolamide, palmitic acid monoethanolamide, stearic acid monoethanolamide, coconut acid monoethanolamide, palm kernel oleic acid monoethanolamide, soybean oleic acid monoethanolamide, and rapeseed oleic acid monoethanolamide.

3. The homogeneous liquid composition comprising fatty acid monoethanolamide as a main component according to claim 1, wherein the fatty acid monoethanolamide is 47% -52% by mass.

4. The homogeneous liquid composition comprising fatty acid monoethanolamide as a main component according to claim 1, wherein the water is present in an amount of 34% to 44% by mass.

5. The homogeneous liquid composition with fatty acid monoethanolamide as a main component according to claim 1, wherein the content of acetic monoethanolamide is 5% -8% by mass.

6. The homogeneous liquid composition comprising fatty acid monoethanolamide as a main component according to claim 1, wherein the oligopeptide is one or a mixture of corn oligopeptide and soybean oligopeptide.

7. The homogeneous liquid composition comprising fatty acid monoethanolamide as a main component according to claim 1, wherein the oligopeptide is present in an amount of 0.1-0.2% by mass.

8. The homogeneous liquid composition comprising fatty acid monoethanolamide as a main component according to claim 1, wherein the oil-water miscible growth promoter is one or more of glycerol, propylene glycol, ethylene glycol, and polyethylene glycol.

9. The homogeneous liquid composition comprising fatty acid monoethanolamide as a main component according to claim 1, wherein the oil-water miscible growth promoter is present in an amount of 4-6% by mass.

10. The method for preparing a homogeneous liquid composition comprising fatty acid monoethanolamide as a main component according to claim 1, comprising the steps of:

step 1, weighing the components according to the weight percentage;

step 2, adding the acetic acid monoethanolamide and the oil-water miscible growth substance weighed in the step 1 into the water, stirring uniformly, and heating to 60 ℃ to obtain an aqueous solution;

and 3, adding the fatty acid monoethanolamide and the oligopeptide into the aqueous solution obtained in the step 2, and continuously stirring until the fatty acid monoethanolamide and the oligopeptide are completely dissolved.

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