Dishwashing Liquid

Posted by InvisibleDoctor on March 17, 2021 at 4:47 pm

Hey Guys!

I discovered this website through a google search and wondered if you could help me?

I’ve had experience formulating moisturisers and sanitisers but I’ve now been asked to formulate a dishwashing liquid.

I’ve been given a list of acceptable chemicals and from those have come up with the following formulation:

Ingredient %W/W

Water	61.99
Sodium Lauryl Ether Sulphate (70%)	13.9
Sodium Dodecylbenzene Sulphate (30%)	5.51
Glucopon 425 (60%)	6
Cocoamidopropyl Betaine (30%)	2
Dimethyl Lauramine Oxide (30%)	4
Ethanol	3
Citric Acid	0.5
Sodium Chloride	1
Sodium Benzoate	1
Colour	1
Fragrance	0.1

I’m not sure how well this would work, and whether I would have trouble with blending any of the ingredients if it does work.

Does anyone have any recommendations?

Thanks!

PhilGeis replied 3 years, 8 months ago 2 Members · 5 Replies

5 Replies

PhilGeis

Member
March 18, 2021 at 10:47 am

Happi (Household and Personal Product Industry) magazine includes product formulae - check back issues. (https://www.happi.com/issues/2021-03-01/).
Re. above - what pH and why benzoate? You’ll prob need a preservative but these products are usually alkaline in pH (8-9) so benzoate is not useful in that context. Most use isothiazolinones.
InvisibleDoctor

Member
March 18, 2021 at 1:00 pm

Hey! I was planning on the pH being 8-9 but the only preservative on my list was Bronopol which I believe also has a better activity in the lower pH ranges. I also found during my research that Bronopol loses stability at pH 4 & above. My only reasoning for adding Benzoate was the choice between the two but perhaps I can leave it out all together. Still doesn’t solve my preservative problem with restricted ingredients however.
PhilGeis

Member
March 18, 2021 at 2:41 pm

You can’t use isothiazolinones preservatives? these are the most commonly used in such products - methyl- and benzo-.
InvisibleDoctor

Member
March 18, 2021 at 5:57 pm

No, unfortunately I was given a very specifc list with the instructions to make a dishwashing liquid. The only preservatives on that list were Sodium Benzoate and Bronopol. I would definitely have tended towards isothiazloninones if they were listed.

I think it’s more of a test to see what I come up with and whether I can pick up a branch of chemistry that’s not my current area.
PhilGeis

Member
March 18, 2021 at 7:49 pm

Bronopol - an odd demand. In US, dishwash liquid preservatives are regulated by EPA and must be registered pesticides. Think Bronopol may be regist’d but not sure for food contact. https://archive.epa.gov/pesticides/reregistration/web/pdf/2770fact.pdf
Benozic acid - think Eemerald Kemala may be selling a registered Benzoic acid but pretty sure it’s enough a preservative here.