Salt-tolerant emulsifier and preparation method thereof

Abstract

The invention relates to an emulsifier, in particular to a salt-tolerant emulsifier and a preparation method thereof. The salt-tolerant emulsifier is prepared from 60 parts of cyclomethicone, 20 parts of polyglycerol-3 diisostearate and 20 parts of PEG-9 (Polyethylene Glycol) polydimethylsiloxane. The preparation method of the salt-resistant emulsifier comprises the following steps: carrying out hot melting on polyglycerol-3 diisostearate and PEG-9 polydimethylsiloxane, and stirring and mixing to obtain a first mixture; cooling the first mixture to 8-10 DEG C during low-speed stirring, and dropwise adding cyclomethicone during low-speed stirring to obtain a second mixture; standing the second mixture to recover normal temperature, pressurizing and stirring at a high speed to obtain a salt-resistant emulsifier; the invention proves that the layering of the mixed emulsifier in a high-salt environment can be relieved by adding the PEG-9 polydimethylsiloxane; in addition, the PEG-9 polydimethylsiloxane has the effect of conditioning the skin, can reduce the irritation, enables the skin to show natural luster, and has the lubricating and moisturizing effects.

Description

TECHNICAL FIELD

[0001] The present application relates to emulsifiers, in particular a salt-tolerant emulsifier and a preparation method thereof. BACKGROUND

[0002] It is a conventional technology to use a mixed emulsifier composed of cyclic polydimethylsiloxane and polyglyceryl-3 diisostearate in daily-use products. For example, a Chinese patent No. 201610479564.7, authorized publication No. 106109285B discloses a CC cream and a preparation method thereof. The CC cream includes water propylene glycol, ethylhexyl palmitate, cyclic polydimethylsiloxane, isononyl isononanoate, titanium dioxide, color-changing powder, glycerin, polymethyl methacrylate, cetyl PEG / PPG-10 / 1 polydimethylsiloxane, polyglyceryl-3 diisostearate, caprylic / capric triglyceride, tridecyl trimellitate, plant extract, bentonite, betaine, magnesium stearate, magnesium sulfate, preservative and essence.

[0003] However, the prior art has defects. When a certain concentration of soluble salt is added to the daily-use product, the ions generated by the dissolution of the salt will react with the original ions of the mixed emulsifier, thereby destroying the interface arrangement of the emulsifier, and even causing oil and water to separate. SUMMARY

[0004] In view of the deficiencies of the prior art, one of the purposes of the present application is to provide a salt-tolerant emulsifier, and the second purpose of the present application is to provide a preparation method of the salt-tolerant emulsifier.

[0005] One of the purposes of the present application is achieved by the following technical solutions:

[0006] A salt-tolerant emulsifier is prepared from the following raw materials by weight:

[0007] Cyclic polydimethylsiloxane (such as D4 / D5) 60 parts, polyglyceryl-3 diisostearate 20 parts and PEG-9 polydimethylsiloxane 20 parts.

[0008] Further, the cyclic polydimethylsiloxane is D5. D5 is widely used in cosmetics and human care products, such as hair conditioner, hair conditioner, foundation and makeup primer, etc., which can provide soft and silky touch and improve the spreading performance of the product.

[0009] The second purpose of the present application is achieved by the following technical solutions:

[0010] A preparation method of a salt-tolerant emulsifier, comprising the following steps:

[0011] Step one, weigh the formula amount of cyclomethicone, polyglyceryl-3 diisostearate and PEG-9 dimethicone;

[0012] Step two, heat and melt polyglyceryl-3 diisostearate and PEG-9 dimethicone and mix them by stirring to obtain a first mixture;

[0013] Step three, cool the first mixture to 8-10 DEG C under low-speed stirring, then add cyclomethicone dropwise under low-speed stirring to obtain a second mixture;

[0014] Step four, after the second mixture is restored to room temperature, pressurize and stir at high speed to obtain the salt-tolerant emulsifier.

[0015] Further, the heating method in step two is heating to 100 DEG C. After heating and melting, the compatibility of the two is greatly improved.

[0016] Further, the stirring method in step two is stirring at 200-500 r / min for 10-20 min. The two materials can be mixed uniformly by conventional stirring.

[0017] Further, the low-speed stirring method in step three is stirring at 20-30 r / min. The significance of low-speed stirring is to maintain the paste-like characteristics of the first mixture in a low-temperature environment (it is difficult to mix with cyclomethicone after solidification), slowly add cyclomethicone, and avoid large-scale volatilization.

[0018] Further, the pressurized high-speed stirring method in step four is to pour the second mixture into a pressurized stirring tank, pressurize to 1.5-2 atm, and stir at 2000-3000 r / min for 5-10 min to complete homogeneous emulsification. Since the second mixture is warmed by standing at this time, conventional stirring / homogenization can easily cause volatile gas to be generated, so the volatilization rate is reduced by pressurization, and rapid homogenization is achieved by high-speed stirring.

[0019] The beneficial effects of the present application are that the addition of PEG-9 dimethicone can alleviate the stratification of mixed emulsifiers in a high-salt environment, and PEG-9 dimethicone has the effect of conditioning the skin, can reduce irritation, make the skin show natural luster, and has lubricating and moisturizing effects. DETAILED DESCRIPTION

[0020] The following further illustrates the specific embodiments:

[0021] Example 1

[0022] Prepare a salt-tolerant emulsifier:

[0023] Step one, according to the weight part of cyclopolysiloxane (D5) 60 parts, polyglycerol-3 diisostearate 20 parts and PEG-9 dimethicone 20 parts;

[0024] Step two, heat the polyglycerol-3 diisostearate and PEG-9 dimethicone to 100℃, and stir at a speed of 200r / min for 10min to obtain a first mixture;

[0025] Step three, cool the first mixture to 8℃ under low speed stirring, and then add cyclopolysiloxane (D5) dropwise under low speed stirring at a speed of 20r / min to obtain a second mixture;

[0026] Step four, after the second mixture is placed to recover to room temperature, pour the second mixture into a pressurized stirring tank, pressurize to 1.5atm, and stir at a speed of 2000r / min for 5min to complete the homogeneous emulsification, and obtain a salt-tolerant emulsifier.

[0027] Example 2

[0028] Preparation of salt-tolerant emulsifier:

[0029] Step one, according to the weight part of cyclopolysiloxane (D5) 60 parts, polyglycerol-3 diisostearate 20 parts and PEG-9 dimethicone 20 parts;

[0030] Step two, heat the polyglycerol-3 diisostearate and PEG-9 dimethicone to 100℃, and stir at a speed of 200r / min for 10min to obtain a first mixture;

[0031] Step three, cool the first mixture to 8℃ under low speed stirring, and then add cyclopolysiloxane (D5) dropwise under low speed stirring at a speed of 20r / min to obtain a second mixture;

[0032] Step four, after the second mixture is placed to recover to room temperature, pour the second mixture into a pressurized stirring tank, pressurize to 1.5atm, and stir at a speed of 2000r / min for 5min to complete the homogeneous emulsification, and obtain a salt-tolerant emulsifier.

[0033] Example 3

[0034] Preparation of salt-tolerant emulsifier:

[0035] Step one, according to the weight part of cyclopolysiloxane (D5) 60 parts, polyglycerol-3 diisostearate 20 parts and PEG-9 dimethicone 20 parts;

[0036] Step two, heat polyglyceryl-3 diisostearate and PEG-9 dimethicone to 100℃, stir at 200-500r / min for 10-20min to obtain a first mixture;

[0037] Step three, cool the first mixture to 9℃ under low speed stirring, then add cyclomethicone dropwise under low speed stirring at 25r / min to obtain a second mixture;

[0038] Step four, after the second mixture is cooled to room temperature, pour the second mixture into a pressurized stirring tank, pressurize to 1.7 atm, and stir at 2500r / min for 7min to complete the homogenization emulsification, to obtain a salt-tolerant emulsifier.

[0039] Comparative Example 1

[0040] Replace PEG-9 dimethicone with equal weight of PEG-100 stearate, and the rest of the steps are the same as Example 1.

[0041] Comparative Example 2

[0042] Replace PEG-9 dimethicone with equal weight of zinc oxide, and the rest of the steps are the same as Example 1.

[0043] Comparative Example 3

[0044] Preparation of conventional emulsifier:

[0045] Step one, weigh cyclomethicone (D5) 60 parts, polyglyceryl-3 diisostearate 20 parts and PEG-9 dimethicone 20 parts;

[0046] Step two, pour the three raw materials into a pressurized stirring tank (tank temperature 25℃), pressurize to 1.5 atm, and stir at 2000r / min for 5min to complete the homogenization emulsification, to obtain a conventional emulsifier.

[0047] Layering test in high salt environment

[0048] Test purpose: to verify that the product obtained by the present application has the property of not easily layering in high salt environment;

[0049] Test method: add Examples 1-3 and Comparative Examples 1-3 to 20wt% sodium chloride aqueous solution at a weight ratio of 20:1, and stir at 1000r / min for 5min, then stand, and observe once a month until visible layering occurs.

[0050] Test results, see Table 1.

[0051] Table 1 Layering Time Record

[0052]

[0053] From the table, it can be seen that the product of the application has better salt resistance than other products with added stabilizers (Comparative Examples 1 and 2); in addition, even compared with a product with the same composition (Comparative Example 3), the salt resistance is also significantly improved after the specific process of the application is used.

[0054] The above examples and description are only illustrative of the principles and best modes of the application and various changes and modifications can be suggested to one skilled in the art without departing from the spirit and scope of the application.

Claims

1. A salt-tolerant emulsifier, characterized in that The invention is prepared from the following raw materials in parts by weight: Cyclomethicone 60 parts, Polyglyceryl-3 Diisostearate 20 parts and PEG-9 Dimethicone 20 parts.

2. The salt-tolerant emulsifier according to claim 1, characterized in that: The cyclomethicone used is D5.

3. A method for preparing a salt-tolerant emulsifier, characterized in that: The following steps are involved: Step 1: Weigh the formulated amounts of cyclomethicone, polyglyceryl-3 diisostearate, and PEG-9 dimethicone; Step 2: hot-melt polyglyceryl-3 diisostearate and PEG-9 polydimethylsiloxane and stir to mix to obtain a first mixture; Step 3, cooling the first mixture to 8-10° C. while stirring at a low speed, and then adding cyclopolydimethylsiloxane dropwise while stirring at a low speed to obtain a second mixture; Step 4: Allow the second mixture to stand and return to room temperature, then pressurize and stir at high speed to obtain a salt-tolerant emulsifier.

4. The method for preparing the salt-tolerant emulsifier according to claim 3, wherein: The hot melt method in step 2 is: heating to 100°C.

5. The method for preparing the salt-tolerant emulsifier according to claim 3, wherein: The stirring method in the step 2 is as follows: the rotation speed is 200-500 r / min, and the stirring time is 10-20 min.

6. The method for preparing the salt-tolerant emulsifier according to claim 3, wherein: The low-speed stirring method in step 3 is as follows: the rotation speed is 20-30 r / min.

7. The method for preparing the salt-tolerant emulsifier according to claim 3, wherein: The pressurized high-speed stirring method in step 4 is as follows: the second mixture is poured into a pressurized stirring tank, pressurized to 1.5-2 atmospheres, and stirred at 2000-3000 r / min for 5-10 minutes to complete homogenization and emulsification.

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