Parabens and Anionic nonionic Surfactants

ChiragChirag Member
edited January 8 in Formulating
Hi all, I would like to thank Perry for first, who created such a useful and knowledge sharing platform and thanks to all whose articles are creating values to me.
Now my question is
I am preparing antibacterial hand wash whose composition is -
Aqua                               46% approx
SLES .                            40%
CAPB .                           7-8%
GLYCERIN .                   5%
EGMS .                           2%
Disodium EDTA.          .5%
METHYL PARABEN .  .5%
PROPYL PARABEN .   .5%
PERFUME
COLOR

My questions are :

1) Some formulations include tetraSodium EDTA. Here I m using Disodium EDTA. What should be used out of these two ?

2) some incorporate salicilyc Acid while other use Triclosan, which should I select in my formulations ?

3) do Parabens goes well with Anionic SLES and nonionic CAPB,CMEA ?  I m incorporating Parabens In cool down phase. Is this Correct way to incorporate ? 

4) what should be the optimum pH of the formula so that the preservatives can be effective ?



Comments

  • 1) Tetrasodium EDTA is used for clear products and basic products (above 7). Disodium EDTA is a stronger chelator and used in acidic products. So, if you are formulating a surfactant with pH >7 and you want it to be transparent use Tetrasodium.
    2) not competent in this area.
    3) Parabens are used with various surfactants. 
    4) Germaben II that consists of: Propylparaben, methylparaben, diazolidinyl urea, propylene glycol, has effective pH range of 3-7.5. It's temperature sensitive and should be added to the cool down phase.

  • chemicalmattchemicalmatt Member, Professional Chemist
    chirag: Na2 EDTA does fine at 0.10% unless you have REALLY hard water. Do not use either SalAc or triclosan, but do use p-chloro-m-xylenol (PCMX) at 0.50%, then you will not only have an anti-bactierial soap but you won't need another preservative. If using PCMX, optimum pH should be in the range of 8.0 - 8.5. Also, drop the glycerin. Completely. Why formulators continue to place glycerin into surfactant cleansing products is beyond me. All it does is decrease foam, viscosity and body and does nothing else. I guess they think it remoisturizes or something? Not while it is flowing down the shower drain. Remoisturizes sewer cockroaches, then?

  • I guess they think it remoisturizes or something? Not while it is flowing down the shower drain. Remoisturizes sewer cockroaches, then?

    @chemicalmatt, you persuaded me :D
  • ozgirlozgirl Member, PCF student
    @chemicalmatt Glycerin is often used to increase the density of the formulation which can help to keep the pearlescent from settling.
  • I did an experiment to see if it is true that glycerin reduces foam in a shampoo. I made identical shampoos, except one contained 3% glycerin. There was no difference in foam profile.
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • I think Methyl paraben & Propyl paraben  are at high level.
    sodium salt water soluble. 
  • I agree, 1% parabens is far too much and the ratio of methyl:propyl is way off.
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • PerryPerry Administrator, Professional Chemist
    Glycerin might help stop the product from becoming crusty in the delivery system if it is delivered from a pump.
  • 1) Tetrasodium EDTA is used for clear products and basic products (above 7). Disodium EDTA is a stronger chelator and used in acidic products. So, if you are formulating a surfactant with pH >7 and you want it to be transparent use Tetrasodium.
    2) not competent in this area.
    3) Parabens are used with various surfactants. 
    4) Germaben II that consists of: Propylparaben, methylparaben, diazolidinyl urea, propylene glycol, has effective pH range of 3-7.5. It's temperature sensitive and should be added to the cool down phase.

    Thanku for answering the questions.
    To my 2nd ques you have said that both the Salisylic Acid and Triclosan are not Compatible in this area. But some Formulations include these including Reckitt benckisers Dettol. If not these than which Antibectarial Agent should II prefer ?
  • chirag: Na2 EDTA does fine at 0.10% unless you have REALLY hard water. Do not use either SalAc or triclosan, but do use p-chloro-m-xylenol (PCMX) at 0.50%, then you will not only have an anti-bactierial soap but you won't need another preservative. If using PCMX, optimum pH should be in the range of 8.0 - 8.5. Also, drop the glycerin. Completely. Why formulators continue to place glycerin into surfactant cleansing products is beyond me. All it does is decrease foam, viscosity and body and does nothing else. I guess they think it remoisturizes or something? Not while it is flowing down the shower drain. Remoisturizes sewer cockroaches, then?

    Chemicalmatt thanks for Taking time out. If I avoid GLYCERIN then which in ngredient can be used to moisturize our hands. Can we use Polyquates ?
  • Belassi said:
    I did an experiment to see if it is true that glycerin reduces foam in a shampoo. I made identical shampoos, except one contained 3% glycerin. There was no difference in foam profile.
    @Belassi infa t Susan Barclay writes, in her Articles, that GLYCERIN Increases the bubble size.
  • Belassi said:
    I agree, 1% parabens is far too much and the ratio of methyl:propyl is way off.
    @Belassi thank You so much. What should be the correct ratio for methyl to PROPYL PARABEN ?
  • Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • em88em88 Member
    Methyl Paraben: Propyl Paraben can be used in the ration of 3:1 or 2:1
    0.2% parabens should be enough, still you should verify this with stability tests.
  • em88 said:
    Methyl Paraben: Propyl Paraben can be used in the ration of 3:1 or 2:1
    0.2% parabens should be enough, still you should verify this with stability tests.
    Thank you em88
Sign In or Register to comment.