Body wash is yellowing over time. Why? - Chemists Corner

Formulating

Body wash is yellowing over time. Why?

Posted by beautysci on August 10, 2015 at 3:15 am

Hi,

This body wash yellows over time (especially at 45C) and I am not sure why. Do you see anything that might be causing the yellowing? Thank you so much in advance.

Part 1

24% Sodium Laureth Sulfate

22.3% Deionized Water

10% Ammonium Lauryl Sulfate

10% Acrylates Copolymer

2.3% TEA

Part 2

27% Deionized Water

3% Cocamidapropyl Betaine

Part 3

1% Deionized Water

0.2% Imidazoldinyl Urea

0.1% Methylchloroisothiazolinone And Methylisothiazolinone

0.1% Disodium EDTA

Procedure:

1. Disperse Acrylates copolymer in water. Add sodium laureth sulfate and ammonium lauryl sulfate.

2. Neutralize to pH 8 with TEA.

3. Premix part 2 and add to Part 1 with gentle mixing.

4. Premix and dissolve Part 3, then add Part 3 to Parts 1 and 2 with gentle mixing.

David replied 8 years, 9 months ago 5 Members · 6 Replies
6 Replies

Bill_Toge

Member
August 10, 2015 at 6:56 am

that’d be your TEA - at that level it’ll cause serious yellowing

just out of interest, how come your acrylates copolymer (hence, your TEA) is in at such a high level?
beautysci

Member
August 10, 2015 at 1:30 pm

I inherited this formula and used the same percentages as was used before. Do you recommend to lower the acrylates copolymer?
OldPerry

Member
August 10, 2015 at 3:08 pm

Wow. Yeah, if your acrylates copolymer is just in there for thickening you should be able to use around 1%.
Chemist77

Member
August 10, 2015 at 4:24 pm

I suppose acrylates copolymer here are not 100% and it maybe a 30% (which generally is the case and which I have seen) solution but still it’s bit on higher side in the sense that it is going to affect the sensorials. Try using AMP-95 if you can, but as @Perry said try to reduce the dosage of the polymer.
OldPerry

Member
August 10, 2015 at 8:23 pm

Ah yes, 1% active. You are correct. And AMP is a good choice too.
David

Member
August 10, 2015 at 10:28 pm

could also be the quality or age of your TEA - however I agree with what is said above - too much and use AMP or NaOH instead

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