Tremendously drop of viscosity

Science

Tremendously drop of viscosity

Posted by PeiHoong on February 20, 2017 at 12:32 am

Hi, I am facing a problem during producing cream type product, for example, BB Cream. The viscosity of the product drop tremendously as time goes. May I know what is the reason causing the drop in viscosity? Is it homogenization problem or the problems on raw materials?
Thank you.

PeiHoong replied 7 years, 1 month ago 6 Members · 13 Replies
- viscosity
13 Replies

belassi

Member
February 20, 2017 at 5:21 am

It is almost impossible to say with just this information. Possibly the pH is drifting; possibly you have insufficient preservation; emulsion failure; many possible causes.
johnb

Member
February 20, 2017 at 7:46 am

Most times I’ve seen this very rare effect it has been caused by microbial growth.
Bill_Toge

Member
February 20, 2017 at 8:31 am

it might be one of those factors

then again, it might be something else entirely
OldPerry

Member
February 20, 2017 at 4:46 pm

If you want a better answer, include your formula or at least a list of all the ingredients in your formula.
PeiHoong

Member
February 22, 2017 at 8:56 am

Thank you guys, attached here is my formulation for your reference. Please advise if I should change or take away any problematic ingredients. Thank you very much!
johnb

Member
February 22, 2017 at 9:04 am

Please be aware that not everyone uses Microsft Office.
Bill_Toge

Member
February 22, 2017 at 1:52 pm

@PeiHoong what’s your method of manufacture?

it looks like a W/Si emulsion, and the stability of those is is very method-dependent

PeiHoong

Member

February 23, 2017 at 12:35 am

@johnb sorry for that, and here is my formulation:

Trade Name	Quantity (%)
PHASE A
LIQUID OIL UV FILTER	11.000
POWDER UV FILTER	1.550

PHASE B
DOW CORNING ES-5612 FORMULATION AID	0.500
PHENOXYETHANOL	0.500
BASE 1.0. YELLOW 3AS
BASE 1.0. RED 3AS
BASE 1.0. BLACK 3AS
DOW CORNING ES-5300 FORMULATION AID	1.700
PHASE C
DC 345 FLUID	13.500
BENTONE 38V	0.300
TIO2
PHASE D
DI WATER	46.030
BUTYLENE GLYCOL 1,3	13.000
Xanthum Gum	0.200
SODIUM CHLORIDE	1.000
ALLANTOIN	0.300
MICROCARE SB	0.600
PHASE E
VITAMIN E ACETATE	0.200
Fragrance	0.050
	100.000

PeiHoong

Member
February 23, 2017 at 12:40 am

@Bill_Toge
Yes, it is a w/si systm. here is my procedure:
1. Phase A is heated to 45’C and then let it cool to room temperature.
2. Phase B AND C are premixed and homogenized for 20 minutes.
3. Phase A is added to the mixture while homogenizing.
4. Phase D is premixed and added little by little into the mixture until a w/si is formed.

Thank you
Bill_Toge

Member
February 23, 2017 at 7:59 am

that sounds to me like your Bentone 38V hasn’t been properly activated, so there’s nothing to stabilise the product’s viscosity and rheology; the product brochure from Elementis (page 9-11) describes how to disperse and activate it

alternatively, you might want to consider using a pre-dispersed form instead
johnb

Member
February 23, 2017 at 8:11 am

As Bill says, solid forms of Bentone require careful “activation” to realise their full potential.

Predispersed Bentones are far easier to use.
chemicalmatt

Member
February 24, 2017 at 5:52 pm

Lose the xanthan gum immediately, and as my esteemed colleagues have suggested use Bentone GEL instead of the raw Bentone colloid because this was only partially activated if at all. Also keep in mind that virtually all W/Si emulsions are unstable intrinsically over time. “Shake before using” on your label will help here too. And, oh yeah, homogenize but do not over-homogenize this or it will fail.
PeiHoong

Member
February 28, 2017 at 6:51 am

yea, thanks all for the advice and i will try to revise the formulation and bentone handling method.

Thank you very much!!