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  • 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, 3 months ago 6 Members · 13 Replies
  • 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!!

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